/*- * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * a) Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * * b) Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the distribution. * * c) Neither the name of Cisco Systems, Inc. nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF * THE POSSIBILITY OF SUCH DAMAGE. */ /* $KAME: sctp_indata.c,v 1.36 2005/03/06 16:04:17 itojun Exp $ */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include /* * NOTES: On the outbound side of things I need to check the sack timer to * see if I should generate a sack into the chunk queue (if I have data to * send that is and will be sending it .. for bundling. * * The callback in sctp_usrreq.c will get called when the socket is read from. * This will cause sctp_service_queues() to get called on the top entry in * the list. */ void sctp_set_rwnd(struct sctp_tcb *stcb, struct sctp_association *asoc) { asoc->my_rwnd = sctp_calc_rwnd(stcb, asoc); } /* Calculate what the rwnd would be */ uint32_t sctp_calc_rwnd(struct sctp_tcb *stcb, struct sctp_association *asoc) { uint32_t calc = 0; /* * This is really set wrong with respect to a 1-2-m socket. Since * the sb_cc is the count that everyone as put up. When we re-write * sctp_soreceive then we will fix this so that ONLY this * associations data is taken into account. */ if (stcb->sctp_socket == NULL) return (calc); if (stcb->asoc.sb_cc == 0 && asoc->size_on_reasm_queue == 0 && asoc->size_on_all_streams == 0) { /* Full rwnd granted */ calc = max(SCTP_SB_LIMIT_RCV(stcb->sctp_socket), SCTP_MINIMAL_RWND); return (calc); } /* get actual space */ calc = (uint32_t) sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv); /* * take out what has NOT been put on socket queue and we yet hold * for putting up. */ calc = sctp_sbspace_sub(calc, (uint32_t) asoc->size_on_reasm_queue); calc = sctp_sbspace_sub(calc, (uint32_t) asoc->size_on_all_streams); if (calc == 0) { /* out of space */ return (calc); } /* what is the overhead of all these rwnd's */ calc = sctp_sbspace_sub(calc, stcb->asoc.my_rwnd_control_len); /* * If the window gets too small due to ctrl-stuff, reduce it to 1, * even it is 0. SWS engaged */ if (calc < stcb->asoc.my_rwnd_control_len) { calc = 1; } return (calc); } /* * Build out our readq entry based on the incoming packet. */ struct sctp_queued_to_read * sctp_build_readq_entry(struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t tsn, uint32_t ppid, uint32_t context, uint16_t stream_no, uint16_t stream_seq, uint8_t flags, struct mbuf *dm) { struct sctp_queued_to_read *read_queue_e = NULL; sctp_alloc_a_readq(stcb, read_queue_e); if (read_queue_e == NULL) { goto failed_build; } read_queue_e->sinfo_stream = stream_no; read_queue_e->sinfo_ssn = stream_seq; read_queue_e->sinfo_flags = (flags << 8); read_queue_e->sinfo_ppid = ppid; read_queue_e->sinfo_context = stcb->asoc.context; read_queue_e->sinfo_timetolive = 0; read_queue_e->sinfo_tsn = tsn; read_queue_e->sinfo_cumtsn = tsn; read_queue_e->sinfo_assoc_id = sctp_get_associd(stcb); read_queue_e->whoFrom = net; read_queue_e->length = 0; atomic_add_int(&net->ref_count, 1); read_queue_e->data = dm; read_queue_e->spec_flags = 0; read_queue_e->tail_mbuf = NULL; read_queue_e->aux_data = NULL; read_queue_e->stcb = stcb; read_queue_e->port_from = stcb->rport; read_queue_e->do_not_ref_stcb = 0; read_queue_e->end_added = 0; read_queue_e->some_taken = 0; read_queue_e->pdapi_aborted = 0; failed_build: return (read_queue_e); } /* * Build out our readq entry based on the incoming packet. */ static struct sctp_queued_to_read * sctp_build_readq_entry_chk(struct sctp_tcb *stcb, struct sctp_tmit_chunk *chk) { struct sctp_queued_to_read *read_queue_e = NULL; sctp_alloc_a_readq(stcb, read_queue_e); if (read_queue_e == NULL) { goto failed_build; } read_queue_e->sinfo_stream = chk->rec.data.stream_number; read_queue_e->sinfo_ssn = chk->rec.data.stream_seq; read_queue_e->sinfo_flags = (chk->rec.data.rcv_flags << 8); read_queue_e->sinfo_ppid = chk->rec.data.payloadtype; read_queue_e->sinfo_context = stcb->asoc.context; read_queue_e->sinfo_timetolive = 0; read_queue_e->sinfo_tsn = chk->rec.data.TSN_seq; read_queue_e->sinfo_cumtsn = chk->rec.data.TSN_seq; read_queue_e->sinfo_assoc_id = sctp_get_associd(stcb); read_queue_e->whoFrom = chk->whoTo; read_queue_e->aux_data = NULL; read_queue_e->length = 0; atomic_add_int(&chk->whoTo->ref_count, 1); read_queue_e->data = chk->data; read_queue_e->tail_mbuf = NULL; read_queue_e->stcb = stcb; read_queue_e->port_from = stcb->rport; read_queue_e->spec_flags = 0; read_queue_e->do_not_ref_stcb = 0; read_queue_e->end_added = 0; read_queue_e->some_taken = 0; read_queue_e->pdapi_aborted = 0; failed_build: return (read_queue_e); } struct mbuf * sctp_build_ctl_nchunk(struct sctp_inpcb *inp, struct sctp_sndrcvinfo *sinfo) { struct sctp_sndrcvinfo *outinfo; struct cmsghdr *cmh; struct mbuf *ret; int len; int use_extended = 0; if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT)) { /* user does not want the sndrcv ctl */ return (NULL); } if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXT_RCVINFO)) { use_extended = 1; len = CMSG_LEN(sizeof(struct sctp_extrcvinfo)); } else { len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo)); } ret = sctp_get_mbuf_for_msg(len, 0, M_DONTWAIT, 1, MT_DATA); if (ret == NULL) { /* No space */ return (ret); } /* We need a CMSG header followed by the struct */ cmh = mtod(ret, struct cmsghdr *); outinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmh); cmh->cmsg_level = IPPROTO_SCTP; if (use_extended) { cmh->cmsg_type = SCTP_EXTRCV; cmh->cmsg_len = len; memcpy(outinfo, sinfo, len); } else { cmh->cmsg_type = SCTP_SNDRCV; cmh->cmsg_len = len; *outinfo = *sinfo; } SCTP_BUF_LEN(ret) = cmh->cmsg_len; return (ret); } char * sctp_build_ctl_cchunk(struct sctp_inpcb *inp, int *control_len, struct sctp_sndrcvinfo *sinfo) { struct sctp_sndrcvinfo *outinfo; struct cmsghdr *cmh; char *buf; int len; int use_extended = 0; if (sctp_is_feature_off(inp, SCTP_PCB_FLAGS_RECVDATAIOEVNT)) { /* user does not want the sndrcv ctl */ return (NULL); } if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_EXT_RCVINFO)) { use_extended = 1; len = CMSG_LEN(sizeof(struct sctp_extrcvinfo)); } else { len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo)); } SCTP_MALLOC(buf, char *, len, SCTP_M_CMSG); if (buf == NULL) { /* No space */ return (buf); } /* We need a CMSG header followed by the struct */ cmh = (struct cmsghdr *)buf; outinfo = (struct sctp_sndrcvinfo *)CMSG_DATA(cmh); cmh->cmsg_level = IPPROTO_SCTP; if (use_extended) { cmh->cmsg_type = SCTP_EXTRCV; cmh->cmsg_len = len; memcpy(outinfo, sinfo, len); } else { cmh->cmsg_type = SCTP_SNDRCV; cmh->cmsg_len = len; *outinfo = *sinfo; } *control_len = len; return (buf); } /* * We are delivering currently from the reassembly queue. We must continue to * deliver until we either: 1) run out of space. 2) run out of sequential * TSN's 3) hit the SCTP_DATA_LAST_FRAG flag. */ static void sctp_service_reassembly(struct sctp_tcb *stcb, struct sctp_association *asoc) { struct sctp_tmit_chunk *chk; uint16_t nxt_todel; uint16_t stream_no; int end = 0; int cntDel; /* EY if any out-of-order delivered, then tag it nr on nr_map */ uint32_t nr_tsn, nr_gap; struct sctp_queued_to_read *control, *ctl, *ctlat; if (stcb == NULL) return; cntDel = stream_no = 0; if ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) || (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) { /* socket above is long gone or going.. */ abandon: asoc->fragmented_delivery_inprogress = 0; chk = TAILQ_FIRST(&asoc->reasmqueue); while (chk) { TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next); asoc->size_on_reasm_queue -= chk->send_size; sctp_ucount_decr(asoc->cnt_on_reasm_queue); /* * Lose the data pointer, since its in the socket * buffer */ if (chk->data) { sctp_m_freem(chk->data); chk->data = NULL; } /* Now free the address and data */ sctp_free_a_chunk(stcb, chk); /* sa_ignore FREED_MEMORY */ chk = TAILQ_FIRST(&asoc->reasmqueue); } return; } SCTP_TCB_LOCK_ASSERT(stcb); do { chk = TAILQ_FIRST(&asoc->reasmqueue); if (chk == NULL) { return; } if (chk->rec.data.TSN_seq != (asoc->tsn_last_delivered + 1)) { /* Can't deliver more :< */ return; } stream_no = chk->rec.data.stream_number; nxt_todel = asoc->strmin[stream_no].last_sequence_delivered + 1; if (nxt_todel != chk->rec.data.stream_seq && (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) { /* * Not the next sequence to deliver in its stream OR * unordered */ return; } if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) { control = sctp_build_readq_entry_chk(stcb, chk); if (control == NULL) { /* out of memory? */ return; } /* save it off for our future deliveries */ stcb->asoc.control_pdapi = control; if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) end = 1; else end = 0; sctp_add_to_readq(stcb->sctp_ep, stcb, control, &stcb->sctp_socket->so_rcv, end, SCTP_SO_NOT_LOCKED); cntDel++; } else { if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) end = 1; else end = 0; if (sctp_append_to_readq(stcb->sctp_ep, stcb, stcb->asoc.control_pdapi, chk->data, end, chk->rec.data.TSN_seq, &stcb->sctp_socket->so_rcv)) { /* * something is very wrong, either * control_pdapi is NULL, or the tail_mbuf * is corrupt, or there is a EOM already on * the mbuf chain. */ if (stcb->asoc.state & SCTP_STATE_ABOUT_TO_BE_FREED) { goto abandon; } else { #ifdef INVARIANTS if ((stcb->asoc.control_pdapi == NULL) || (stcb->asoc.control_pdapi->tail_mbuf == NULL)) { panic("This should not happen control_pdapi NULL?"); } /* if we did not panic, it was a EOM */ panic("Bad chunking ??"); #else if ((stcb->asoc.control_pdapi == NULL) || (stcb->asoc.control_pdapi->tail_mbuf == NULL)) { SCTP_PRINTF("This should not happen control_pdapi NULL?\n"); } SCTP_PRINTF("Bad chunking ??\n"); SCTP_PRINTF("Dumping re-assembly queue this will probably hose the association\n"); #endif goto abandon; } } cntDel++; } /* pull it we did it */ TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next); /* * EY this is the chunk that should be tagged nr gapped * calculate the gap and such then tag this TSN nr * chk->rec.data.TSN_seq */ /* * EY!-TODO- this tsn should be tagged nr only if it is * out-of-order, the if statement should be modified */ if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) { nr_tsn = chk->rec.data.TSN_seq; if (nr_tsn >= asoc->nr_mapping_array_base_tsn) { nr_gap = nr_tsn - asoc->nr_mapping_array_base_tsn; } else { nr_gap = (MAX_TSN - asoc->nr_mapping_array_base_tsn) + nr_tsn + 1; } if ((nr_gap >= (SCTP_NR_MAPPING_ARRAY << 3)) || (nr_gap >= (uint32_t) (asoc->nr_mapping_array_size << 3))) { /* * EY The 1st should never happen, as in * process_a_data_chunk method this check * should be done */ /* * EY The 2nd should never happen, because * nr_mapping_array is always expanded when * mapping_array is expanded */ } else { SCTP_TCB_LOCK_ASSERT(stcb); SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, nr_gap); if (nr_tsn > asoc->highest_tsn_inside_nr_map) asoc->highest_tsn_inside_nr_map = nr_tsn; } } if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) { asoc->fragmented_delivery_inprogress = 0; if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0) { asoc->strmin[stream_no].last_sequence_delivered++; } if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0) { SCTP_STAT_INCR_COUNTER64(sctps_reasmusrmsgs); } } else if (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) { /* * turn the flag back on since we just delivered * yet another one. */ asoc->fragmented_delivery_inprogress = 1; } asoc->tsn_of_pdapi_last_delivered = chk->rec.data.TSN_seq; asoc->last_flags_delivered = chk->rec.data.rcv_flags; asoc->last_strm_seq_delivered = chk->rec.data.stream_seq; asoc->last_strm_no_delivered = chk->rec.data.stream_number; asoc->tsn_last_delivered = chk->rec.data.TSN_seq; asoc->size_on_reasm_queue -= chk->send_size; sctp_ucount_decr(asoc->cnt_on_reasm_queue); /* free up the chk */ chk->data = NULL; sctp_free_a_chunk(stcb, chk); if (asoc->fragmented_delivery_inprogress == 0) { /* * Now lets see if we can deliver the next one on * the stream */ struct sctp_stream_in *strm; strm = &asoc->strmin[stream_no]; nxt_todel = strm->last_sequence_delivered + 1; ctl = TAILQ_FIRST(&strm->inqueue); if (ctl && (nxt_todel == ctl->sinfo_ssn)) { while (ctl != NULL) { /* Deliver more if we can. */ if (nxt_todel == ctl->sinfo_ssn) { ctlat = TAILQ_NEXT(ctl, next); TAILQ_REMOVE(&strm->inqueue, ctl, next); asoc->size_on_all_streams -= ctl->length; sctp_ucount_decr(asoc->cnt_on_all_streams); strm->last_sequence_delivered++; /* * EY will be used to * calculate nr-gap */ nr_tsn = ctl->sinfo_tsn; sctp_add_to_readq(stcb->sctp_ep, stcb, ctl, &stcb->sctp_socket->so_rcv, 1, SCTP_SO_NOT_LOCKED); /* * EY -now something is * delivered, calculate * nr_gap and tag this tsn * NR */ if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) { if (nr_tsn >= asoc->nr_mapping_array_base_tsn) { nr_gap = nr_tsn - asoc->nr_mapping_array_base_tsn; } else { nr_gap = (MAX_TSN - asoc->nr_mapping_array_base_tsn) + nr_tsn + 1; } if ((nr_gap >= (SCTP_NR_MAPPING_ARRAY << 3)) || (nr_gap >= (uint32_t) (asoc->nr_mapping_array_size << 3))) { /* * EY The * 1st * should * never * happen, * as in * process_a_ * data_chunk * method * this * check * should be * done */ /* * EY The * 2nd * should * never * happen, * because * nr_mapping * _array is * always * expanded * when * mapping_ar * ray is * expanded */ } else { SCTP_TCB_LOCK_ASSERT(stcb); SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, nr_gap); if (nr_tsn > asoc->highest_tsn_inside_nr_map) asoc->highest_tsn_inside_nr_map = nr_tsn; } } ctl = ctlat; } else { break; } nxt_todel = strm->last_sequence_delivered + 1; } } break; } /* sa_ignore FREED_MEMORY */ chk = TAILQ_FIRST(&asoc->reasmqueue); } while (chk); } /* * Queue the chunk either right into the socket buffer if it is the next one * to go OR put it in the correct place in the delivery queue. If we do * append to the so_buf, keep doing so until we are out of order. One big * question still remains, what to do when the socket buffer is FULL?? */ static void sctp_queue_data_to_stream(struct sctp_tcb *stcb, struct sctp_association *asoc, struct sctp_queued_to_read *control, int *abort_flag) { /* * FIX-ME maybe? What happens when the ssn wraps? If we are getting * all the data in one stream this could happen quite rapidly. One * could use the TSN to keep track of things, but this scheme breaks * down in the other type of stream useage that could occur. Send a * single msg to stream 0, send 4Billion messages to stream 1, now * send a message to stream 0. You have a situation where the TSN * has wrapped but not in the stream. Is this worth worrying about * or should we just change our queue sort at the bottom to be by * TSN. * * Could it also be legal for a peer to send ssn 1 with TSN 2 and ssn 2 * with TSN 1? If the peer is doing some sort of funky TSN/SSN * assignment this could happen... and I don't see how this would be * a violation. So for now I am undecided an will leave the sort by * SSN alone. Maybe a hybred approach is the answer * */ struct sctp_stream_in *strm; struct sctp_queued_to_read *at; int queue_needed; uint16_t nxt_todel; struct mbuf *oper; /* EY- will be used to calculate nr-gap for a tsn */ uint32_t nr_tsn, nr_gap; queue_needed = 1; asoc->size_on_all_streams += control->length; sctp_ucount_incr(asoc->cnt_on_all_streams); strm = &asoc->strmin[control->sinfo_stream]; nxt_todel = strm->last_sequence_delivered + 1; if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_INTO_STRD); } SCTPDBG(SCTP_DEBUG_INDATA1, "queue to stream called for ssn:%u lastdel:%u nxt:%u\n", (uint32_t) control->sinfo_stream, (uint32_t) strm->last_sequence_delivered, (uint32_t) nxt_todel); if (compare_with_wrap(strm->last_sequence_delivered, control->sinfo_ssn, MAX_SEQ) || (strm->last_sequence_delivered == control->sinfo_ssn)) { /* The incoming sseq is behind where we last delivered? */ SCTPDBG(SCTP_DEBUG_INDATA1, "Duplicate S-SEQ:%d delivered:%d from peer, Abort association\n", control->sinfo_ssn, strm->last_sequence_delivered); protocol_error: /* * throw it in the stream so it gets cleaned up in * association destruction */ TAILQ_INSERT_HEAD(&strm->inqueue, control, next); oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 0, M_DONTWAIT, 1, MT_DATA); if (oper) { struct sctp_paramhdr *ph; uint32_t *ippp; SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + (sizeof(uint32_t) * 3); ph = mtod(oper, struct sctp_paramhdr *); ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); ph->param_length = htons(SCTP_BUF_LEN(oper)); ippp = (uint32_t *) (ph + 1); *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_1); ippp++; *ippp = control->sinfo_tsn; ippp++; *ippp = ((control->sinfo_stream << 16) | control->sinfo_ssn); } stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_1; sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); *abort_flag = 1; return; } if (nxt_todel == control->sinfo_ssn) { /* can be delivered right away? */ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_IMMED_DEL); } /* EY it wont be queued if it could be delivered directly */ queue_needed = 0; asoc->size_on_all_streams -= control->length; sctp_ucount_decr(asoc->cnt_on_all_streams); strm->last_sequence_delivered++; /* EY will be used to calculate nr-gap */ nr_tsn = control->sinfo_tsn; sctp_add_to_readq(stcb->sctp_ep, stcb, control, &stcb->sctp_socket->so_rcv, 1, SCTP_SO_NOT_LOCKED); /* * EY this is the chunk that should be tagged nr gapped * calculate the gap and such then tag this TSN nr * chk->rec.data.TSN_seq */ if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) { if (nr_tsn >= asoc->nr_mapping_array_base_tsn) { nr_gap = nr_tsn - asoc->nr_mapping_array_base_tsn; } else { nr_gap = (MAX_TSN - asoc->nr_mapping_array_base_tsn) + nr_tsn + 1; } if ((nr_gap >= (SCTP_NR_MAPPING_ARRAY << 3)) || (nr_gap >= (uint32_t) (asoc->nr_mapping_array_size << 3))) { /* * EY The 1st should never happen, as in * process_a_data_chunk method this check * should be done */ /* * EY The 2nd should never happen, because * nr_mapping_array is always expanded when * mapping_array is expanded */ } else { SCTP_TCB_LOCK_ASSERT(stcb); SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, nr_gap); if (nr_tsn > asoc->highest_tsn_inside_nr_map) asoc->highest_tsn_inside_nr_map = nr_tsn; } } control = TAILQ_FIRST(&strm->inqueue); while (control != NULL) { /* all delivered */ nxt_todel = strm->last_sequence_delivered + 1; if (nxt_todel == control->sinfo_ssn) { at = TAILQ_NEXT(control, next); TAILQ_REMOVE(&strm->inqueue, control, next); asoc->size_on_all_streams -= control->length; sctp_ucount_decr(asoc->cnt_on_all_streams); strm->last_sequence_delivered++; /* * We ignore the return of deliver_data here * since we always can hold the chunk on the * d-queue. And we have a finite number that * can be delivered from the strq. */ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_IMMED_DEL); } /* EY will be used to calculate nr-gap */ nr_tsn = control->sinfo_tsn; sctp_add_to_readq(stcb->sctp_ep, stcb, control, &stcb->sctp_socket->so_rcv, 1, SCTP_SO_NOT_LOCKED); /* * EY this is the chunk that should be * tagged nr gapped calculate the gap and * such then tag this TSN nr * chk->rec.data.TSN_seq */ if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) { if (nr_tsn >= asoc->nr_mapping_array_base_tsn) { nr_gap = nr_tsn - asoc->nr_mapping_array_base_tsn; } else { nr_gap = (MAX_TSN - asoc->nr_mapping_array_base_tsn) + nr_tsn + 1; } if ((nr_gap >= (SCTP_NR_MAPPING_ARRAY << 3)) || (nr_gap >= (uint32_t) (asoc->nr_mapping_array_size << 3))) { /* * EY The 1st should never * happen, as in * process_a_data_chunk * method this check should * be done */ /* * EY The 2nd should never * happen, because * nr_mapping_array is * always expanded when * mapping_array is expanded */ } else { SCTP_TCB_LOCK_ASSERT(stcb); SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, nr_gap); if (nr_tsn > asoc->highest_tsn_inside_nr_map) asoc->highest_tsn_inside_nr_map = nr_tsn; } } control = at; continue; } break; } } if (queue_needed) { /* * Ok, we did not deliver this guy, find the correct place * to put it on the queue. */ if ((compare_with_wrap(asoc->cumulative_tsn, control->sinfo_tsn, MAX_TSN)) || (control->sinfo_tsn == asoc->cumulative_tsn)) { goto protocol_error; } if (TAILQ_EMPTY(&strm->inqueue)) { /* Empty queue */ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { sctp_log_strm_del(control, NULL, SCTP_STR_LOG_FROM_INSERT_HD); } TAILQ_INSERT_HEAD(&strm->inqueue, control, next); } else { TAILQ_FOREACH(at, &strm->inqueue, next) { if (compare_with_wrap(at->sinfo_ssn, control->sinfo_ssn, MAX_SEQ)) { /* * one in queue is bigger than the * new one, insert before this one */ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { sctp_log_strm_del(control, at, SCTP_STR_LOG_FROM_INSERT_MD); } TAILQ_INSERT_BEFORE(at, control, next); break; } else if (at->sinfo_ssn == control->sinfo_ssn) { /* * Gak, He sent me a duplicate str * seq number */ /* * foo bar, I guess I will just free * this new guy, should we abort * too? FIX ME MAYBE? Or it COULD be * that the SSN's have wrapped. * Maybe I should compare to TSN * somehow... sigh for now just blow * away the chunk! */ if (control->data) sctp_m_freem(control->data); control->data = NULL; asoc->size_on_all_streams -= control->length; sctp_ucount_decr(asoc->cnt_on_all_streams); if (control->whoFrom) sctp_free_remote_addr(control->whoFrom); control->whoFrom = NULL; sctp_free_a_readq(stcb, control); return; } else { if (TAILQ_NEXT(at, next) == NULL) { /* * We are at the end, insert * it after this one */ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { sctp_log_strm_del(control, at, SCTP_STR_LOG_FROM_INSERT_TL); } TAILQ_INSERT_AFTER(&strm->inqueue, at, control, next); break; } } } } } } /* * Returns two things: You get the total size of the deliverable parts of the * first fragmented message on the reassembly queue. And you get a 1 back if * all of the message is ready or a 0 back if the message is still incomplete */ static int sctp_is_all_msg_on_reasm(struct sctp_association *asoc, uint32_t * t_size) { struct sctp_tmit_chunk *chk; uint32_t tsn; *t_size = 0; chk = TAILQ_FIRST(&asoc->reasmqueue); if (chk == NULL) { /* nothing on the queue */ return (0); } if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == 0) { /* Not a first on the queue */ return (0); } tsn = chk->rec.data.TSN_seq; while (chk) { if (tsn != chk->rec.data.TSN_seq) { return (0); } *t_size += chk->send_size; if (chk->rec.data.rcv_flags & SCTP_DATA_LAST_FRAG) { return (1); } tsn++; chk = TAILQ_NEXT(chk, sctp_next); } return (0); } static void sctp_deliver_reasm_check(struct sctp_tcb *stcb, struct sctp_association *asoc) { struct sctp_tmit_chunk *chk; uint16_t nxt_todel; uint32_t tsize; doit_again: chk = TAILQ_FIRST(&asoc->reasmqueue); if (chk == NULL) { /* Huh? */ asoc->size_on_reasm_queue = 0; asoc->cnt_on_reasm_queue = 0; return; } if (asoc->fragmented_delivery_inprogress == 0) { nxt_todel = asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered + 1; if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) && (nxt_todel == chk->rec.data.stream_seq || (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED))) { /* * Yep the first one is here and its ok to deliver * but should we? */ if ((sctp_is_all_msg_on_reasm(asoc, &tsize) || (tsize >= stcb->sctp_ep->partial_delivery_point))) { /* * Yes, we setup to start reception, by * backing down the TSN just in case we * can't deliver. If we */ asoc->fragmented_delivery_inprogress = 1; asoc->tsn_last_delivered = chk->rec.data.TSN_seq - 1; asoc->str_of_pdapi = chk->rec.data.stream_number; asoc->ssn_of_pdapi = chk->rec.data.stream_seq; asoc->pdapi_ppid = chk->rec.data.payloadtype; asoc->fragment_flags = chk->rec.data.rcv_flags; sctp_service_reassembly(stcb, asoc); } } } else { /* * Service re-assembly will deliver stream data queued at * the end of fragmented delivery.. but it wont know to go * back and call itself again... we do that here with the * got doit_again */ sctp_service_reassembly(stcb, asoc); if (asoc->fragmented_delivery_inprogress == 0) { /* * finished our Fragmented delivery, could be more * waiting? */ goto doit_again; } } } /* * Dump onto the re-assembly queue, in its proper place. After dumping on the * queue, see if anthing can be delivered. If so pull it off (or as much as * we can. If we run out of space then we must dump what we can and set the * appropriate flag to say we queued what we could. */ static void sctp_queue_data_for_reasm(struct sctp_tcb *stcb, struct sctp_association *asoc, struct sctp_tmit_chunk *chk, int *abort_flag) { struct mbuf *oper; uint32_t cum_ackp1, last_tsn, prev_tsn, post_tsn; u_char last_flags; struct sctp_tmit_chunk *at, *prev, *next; prev = next = NULL; cum_ackp1 = asoc->tsn_last_delivered + 1; if (TAILQ_EMPTY(&asoc->reasmqueue)) { /* This is the first one on the queue */ TAILQ_INSERT_HEAD(&asoc->reasmqueue, chk, sctp_next); /* * we do not check for delivery of anything when only one * fragment is here */ asoc->size_on_reasm_queue = chk->send_size; sctp_ucount_incr(asoc->cnt_on_reasm_queue); if (chk->rec.data.TSN_seq == cum_ackp1) { if (asoc->fragmented_delivery_inprogress == 0 && (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) != SCTP_DATA_FIRST_FRAG) { /* * An empty queue, no delivery inprogress, * we hit the next one and it does NOT have * a FIRST fragment mark. */ SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, its not first, no fragmented delivery in progress\n"); oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 0, M_DONTWAIT, 1, MT_DATA); if (oper) { struct sctp_paramhdr *ph; uint32_t *ippp; SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + (sizeof(uint32_t) * 3); ph = mtod(oper, struct sctp_paramhdr *); ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); ph->param_length = htons(SCTP_BUF_LEN(oper)); ippp = (uint32_t *) (ph + 1); *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_2); ippp++; *ippp = chk->rec.data.TSN_seq; ippp++; *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); } stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_2; sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); *abort_flag = 1; } else if (asoc->fragmented_delivery_inprogress && (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) == SCTP_DATA_FIRST_FRAG) { /* * We are doing a partial delivery and the * NEXT chunk MUST be either the LAST or * MIDDLE fragment NOT a FIRST */ SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS a first and fragmented delivery in progress\n"); oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 0, M_DONTWAIT, 1, MT_DATA); if (oper) { struct sctp_paramhdr *ph; uint32_t *ippp; SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + (3 * sizeof(uint32_t)); ph = mtod(oper, struct sctp_paramhdr *); ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); ph->param_length = htons(SCTP_BUF_LEN(oper)); ippp = (uint32_t *) (ph + 1); *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_3); ippp++; *ippp = chk->rec.data.TSN_seq; ippp++; *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); } stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_3; sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); *abort_flag = 1; } else if (asoc->fragmented_delivery_inprogress) { /* * Here we are ok with a MIDDLE or LAST * piece */ if (chk->rec.data.stream_number != asoc->str_of_pdapi) { /* Got to be the right STR No */ SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS not same stream number %d vs %d\n", chk->rec.data.stream_number, asoc->str_of_pdapi); oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 0, M_DONTWAIT, 1, MT_DATA); if (oper) { struct sctp_paramhdr *ph; uint32_t *ippp; SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + (sizeof(uint32_t) * 3); ph = mtod(oper, struct sctp_paramhdr *); ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); ph->param_length = htons(SCTP_BUF_LEN(oper)); ippp = (uint32_t *) (ph + 1); *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_4); ippp++; *ippp = chk->rec.data.TSN_seq; ippp++; *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); } stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_4; sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); *abort_flag = 1; } else if ((asoc->fragment_flags & SCTP_DATA_UNORDERED) != SCTP_DATA_UNORDERED && chk->rec.data.stream_seq != asoc->ssn_of_pdapi) { /* Got to be the right STR Seq */ SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it IS not same stream seq %d vs %d\n", chk->rec.data.stream_seq, asoc->ssn_of_pdapi); oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 0, M_DONTWAIT, 1, MT_DATA); if (oper) { struct sctp_paramhdr *ph; uint32_t *ippp; SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + (3 * sizeof(uint32_t)); ph = mtod(oper, struct sctp_paramhdr *); ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); ph->param_length = htons(SCTP_BUF_LEN(oper)); ippp = (uint32_t *) (ph + 1); *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_5); ippp++; *ippp = chk->rec.data.TSN_seq; ippp++; *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); } stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_5; sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); *abort_flag = 1; } } } return; } /* Find its place */ TAILQ_FOREACH(at, &asoc->reasmqueue, sctp_next) { if (compare_with_wrap(at->rec.data.TSN_seq, chk->rec.data.TSN_seq, MAX_TSN)) { /* * one in queue is bigger than the new one, insert * before this one */ /* A check */ asoc->size_on_reasm_queue += chk->send_size; sctp_ucount_incr(asoc->cnt_on_reasm_queue); next = at; TAILQ_INSERT_BEFORE(at, chk, sctp_next); break; } else if (at->rec.data.TSN_seq == chk->rec.data.TSN_seq) { /* Gak, He sent me a duplicate str seq number */ /* * foo bar, I guess I will just free this new guy, * should we abort too? FIX ME MAYBE? Or it COULD be * that the SSN's have wrapped. Maybe I should * compare to TSN somehow... sigh for now just blow * away the chunk! */ if (chk->data) { sctp_m_freem(chk->data); chk->data = NULL; } sctp_free_a_chunk(stcb, chk); return; } else { last_flags = at->rec.data.rcv_flags; last_tsn = at->rec.data.TSN_seq; prev = at; if (TAILQ_NEXT(at, sctp_next) == NULL) { /* * We are at the end, insert it after this * one */ /* check it first */ asoc->size_on_reasm_queue += chk->send_size; sctp_ucount_incr(asoc->cnt_on_reasm_queue); TAILQ_INSERT_AFTER(&asoc->reasmqueue, at, chk, sctp_next); break; } } } /* Now the audits */ if (prev) { prev_tsn = chk->rec.data.TSN_seq - 1; if (prev_tsn == prev->rec.data.TSN_seq) { /* * Ok the one I am dropping onto the end is the * NEXT. A bit of valdiation here. */ if ((prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == SCTP_DATA_FIRST_FRAG || (prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == SCTP_DATA_MIDDLE_FRAG) { /* * Insert chk MUST be a MIDDLE or LAST * fragment */ if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == SCTP_DATA_FIRST_FRAG) { SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - It can be a midlle or last but not a first\n"); SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, it's a FIRST!\n"); oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 0, M_DONTWAIT, 1, MT_DATA); if (oper) { struct sctp_paramhdr *ph; uint32_t *ippp; SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + (3 * sizeof(uint32_t)); ph = mtod(oper, struct sctp_paramhdr *); ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); ph->param_length = htons(SCTP_BUF_LEN(oper)); ippp = (uint32_t *) (ph + 1); *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_6); ippp++; *ippp = chk->rec.data.TSN_seq; ippp++; *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); } stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_6; sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); *abort_flag = 1; return; } if (chk->rec.data.stream_number != prev->rec.data.stream_number) { /* * Huh, need the correct STR here, * they must be the same. */ SCTP_PRINTF("Prev check - Gak, Evil plot, ssn:%d not the same as at:%d\n", chk->rec.data.stream_number, prev->rec.data.stream_number); oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 0, M_DONTWAIT, 1, MT_DATA); if (oper) { struct sctp_paramhdr *ph; uint32_t *ippp; SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + (3 * sizeof(uint32_t)); ph = mtod(oper, struct sctp_paramhdr *); ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); ph->param_length = htons(SCTP_BUF_LEN(oper)); ippp = (uint32_t *) (ph + 1); *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_7); ippp++; *ippp = chk->rec.data.TSN_seq; ippp++; *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); } stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_7; sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); *abort_flag = 1; return; } if ((prev->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0 && chk->rec.data.stream_seq != prev->rec.data.stream_seq) { /* * Huh, need the correct STR here, * they must be the same. */ SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, Evil plot, sseq:%d not the same as at:%d\n", chk->rec.data.stream_seq, prev->rec.data.stream_seq); oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 0, M_DONTWAIT, 1, MT_DATA); if (oper) { struct sctp_paramhdr *ph; uint32_t *ippp; SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + (3 * sizeof(uint32_t)); ph = mtod(oper, struct sctp_paramhdr *); ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); ph->param_length = htons(SCTP_BUF_LEN(oper)); ippp = (uint32_t *) (ph + 1); *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_8); ippp++; *ippp = chk->rec.data.TSN_seq; ippp++; *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); } stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_8; sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); *abort_flag = 1; return; } } else if ((prev->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == SCTP_DATA_LAST_FRAG) { /* Insert chk MUST be a FIRST */ if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) != SCTP_DATA_FIRST_FRAG) { SCTPDBG(SCTP_DEBUG_INDATA1, "Prev check - Gak, evil plot, its not FIRST and it must be!\n"); oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 0, M_DONTWAIT, 1, MT_DATA); if (oper) { struct sctp_paramhdr *ph; uint32_t *ippp; SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + (3 * sizeof(uint32_t)); ph = mtod(oper, struct sctp_paramhdr *); ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); ph->param_length = htons(SCTP_BUF_LEN(oper)); ippp = (uint32_t *) (ph + 1); *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_9); ippp++; *ippp = chk->rec.data.TSN_seq; ippp++; *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); } stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_9; sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); *abort_flag = 1; return; } } } } if (next) { post_tsn = chk->rec.data.TSN_seq + 1; if (post_tsn == next->rec.data.TSN_seq) { /* * Ok the one I am inserting ahead of is my NEXT * one. A bit of valdiation here. */ if (next->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) { /* Insert chk MUST be a last fragment */ if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) != SCTP_DATA_LAST_FRAG) { SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Next is FIRST, we must be LAST\n"); SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, its not a last!\n"); oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 0, M_DONTWAIT, 1, MT_DATA); if (oper) { struct sctp_paramhdr *ph; uint32_t *ippp; SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + (3 * sizeof(uint32_t)); ph = mtod(oper, struct sctp_paramhdr *); ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); ph->param_length = htons(SCTP_BUF_LEN(oper)); ippp = (uint32_t *) (ph + 1); *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_10); ippp++; *ippp = chk->rec.data.TSN_seq; ippp++; *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); } stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_10; sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); *abort_flag = 1; return; } } else if ((next->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == SCTP_DATA_MIDDLE_FRAG || (next->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == SCTP_DATA_LAST_FRAG) { /* * Insert chk CAN be MIDDLE or FIRST NOT * LAST */ if ((chk->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) == SCTP_DATA_LAST_FRAG) { SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Next is a MIDDLE/LAST\n"); SCTPDBG(SCTP_DEBUG_INDATA1, "Gak, Evil plot, new prev chunk is a LAST\n"); oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 0, M_DONTWAIT, 1, MT_DATA); if (oper) { struct sctp_paramhdr *ph; uint32_t *ippp; SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + (3 * sizeof(uint32_t)); ph = mtod(oper, struct sctp_paramhdr *); ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); ph->param_length = htons(SCTP_BUF_LEN(oper)); ippp = (uint32_t *) (ph + 1); *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_11); ippp++; *ippp = chk->rec.data.TSN_seq; ippp++; *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); } stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_11; sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); *abort_flag = 1; return; } if (chk->rec.data.stream_number != next->rec.data.stream_number) { /* * Huh, need the correct STR here, * they must be the same. */ SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Gak, Evil plot, ssn:%d not the same as at:%d\n", chk->rec.data.stream_number, next->rec.data.stream_number); oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 0, M_DONTWAIT, 1, MT_DATA); if (oper) { struct sctp_paramhdr *ph; uint32_t *ippp; SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + (3 * sizeof(uint32_t)); ph = mtod(oper, struct sctp_paramhdr *); ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); ph->param_length = htons(SCTP_BUF_LEN(oper)); ippp = (uint32_t *) (ph + 1); *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_12); ippp++; *ippp = chk->rec.data.TSN_seq; ippp++; *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); } stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_12; sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); *abort_flag = 1; return; } if ((next->rec.data.rcv_flags & SCTP_DATA_UNORDERED) == 0 && chk->rec.data.stream_seq != next->rec.data.stream_seq) { /* * Huh, need the correct STR here, * they must be the same. */ SCTPDBG(SCTP_DEBUG_INDATA1, "Next chk - Gak, Evil plot, sseq:%d not the same as at:%d\n", chk->rec.data.stream_seq, next->rec.data.stream_seq); oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 0, M_DONTWAIT, 1, MT_DATA); if (oper) { struct sctp_paramhdr *ph; uint32_t *ippp; SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + (3 * sizeof(uint32_t)); ph = mtod(oper, struct sctp_paramhdr *); ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); ph->param_length = htons(SCTP_BUF_LEN(oper)); ippp = (uint32_t *) (ph + 1); *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_13); ippp++; *ippp = chk->rec.data.TSN_seq; ippp++; *ippp = ((chk->rec.data.stream_number << 16) | chk->rec.data.stream_seq); } stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_13; sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); *abort_flag = 1; return; } } } } /* Do we need to do some delivery? check */ sctp_deliver_reasm_check(stcb, asoc); } /* * This is an unfortunate routine. It checks to make sure a evil guy is not * stuffing us full of bad packet fragments. A broken peer could also do this * but this is doubtful. It is to bad I must worry about evil crackers sigh * :< more cycles. */ static int sctp_does_tsn_belong_to_reasm(struct sctp_association *asoc, uint32_t TSN_seq) { struct sctp_tmit_chunk *at; uint32_t tsn_est; TAILQ_FOREACH(at, &asoc->reasmqueue, sctp_next) { if (compare_with_wrap(TSN_seq, at->rec.data.TSN_seq, MAX_TSN)) { /* is it one bigger? */ tsn_est = at->rec.data.TSN_seq + 1; if (tsn_est == TSN_seq) { /* yep. It better be a last then */ if ((at->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) != SCTP_DATA_LAST_FRAG) { /* * Ok this guy belongs next to a guy * that is NOT last, it should be a * middle/last, not a complete * chunk. */ return (1); } else { /* * This guy is ok since its a LAST * and the new chunk is a fully * self- contained one. */ return (0); } } } else if (TSN_seq == at->rec.data.TSN_seq) { /* Software error since I have a dup? */ return (1); } else { /* * Ok, 'at' is larger than new chunk but does it * need to be right before it. */ tsn_est = TSN_seq + 1; if (tsn_est == at->rec.data.TSN_seq) { /* Yep, It better be a first */ if ((at->rec.data.rcv_flags & SCTP_DATA_FRAG_MASK) != SCTP_DATA_FIRST_FRAG) { return (1); } else { return (0); } } } } return (0); } static int sctp_process_a_data_chunk(struct sctp_tcb *stcb, struct sctp_association *asoc, struct mbuf **m, int offset, struct sctp_data_chunk *ch, int chk_length, struct sctp_nets *net, uint32_t * high_tsn, int *abort_flag, int *break_flag, int last_chunk) { /* Process a data chunk */ /* struct sctp_tmit_chunk *chk; */ struct sctp_tmit_chunk *chk; uint32_t tsn, gap; /* EY - for nr_sack */ uint32_t nr_gap; struct mbuf *dmbuf; int indx, the_len; int need_reasm_check = 0; uint16_t strmno, strmseq; struct mbuf *oper; struct sctp_queued_to_read *control; int ordered; uint32_t protocol_id; uint8_t chunk_flags; struct sctp_stream_reset_list *liste; chk = NULL; tsn = ntohl(ch->dp.tsn); chunk_flags = ch->ch.chunk_flags; if ((chunk_flags & SCTP_DATA_SACK_IMMEDIATELY) == SCTP_DATA_SACK_IMMEDIATELY) { asoc->send_sack = 1; } protocol_id = ch->dp.protocol_id; ordered = ((ch->ch.chunk_flags & SCTP_DATA_UNORDERED) == 0); if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { sctp_log_map(tsn, asoc->cumulative_tsn, asoc->highest_tsn_inside_map, SCTP_MAP_TSN_ENTERS); } if (stcb == NULL) { return (0); } SCTP_LTRACE_CHK(stcb->sctp_ep, stcb, ch->ch.chunk_type, tsn); if (compare_with_wrap(asoc->cumulative_tsn, tsn, MAX_TSN) || asoc->cumulative_tsn == tsn) { /* It is a duplicate */ SCTP_STAT_INCR(sctps_recvdupdata); if (asoc->numduptsns < SCTP_MAX_DUP_TSNS) { /* Record a dup for the next outbound sack */ asoc->dup_tsns[asoc->numduptsns] = tsn; asoc->numduptsns++; } asoc->send_sack = 1; return (0); } /* Calculate the number of TSN's between the base and this TSN */ if (tsn >= asoc->mapping_array_base_tsn) { gap = tsn - asoc->mapping_array_base_tsn; } else { gap = (MAX_TSN - asoc->mapping_array_base_tsn) + tsn + 1; } if (gap >= (SCTP_MAPPING_ARRAY << 3)) { /* Can't hold the bit in the mapping at max array, toss it */ return (0); } if (gap >= (uint32_t) (asoc->mapping_array_size << 3)) { SCTP_TCB_LOCK_ASSERT(stcb); if (sctp_expand_mapping_array(asoc, gap)) { /* Can't expand, drop it */ return (0); } } /* EY - for nr_sack */ nr_gap = gap; if (compare_with_wrap(tsn, *high_tsn, MAX_TSN)) { *high_tsn = tsn; } /* See if we have received this one already */ if (SCTP_IS_TSN_PRESENT(asoc->mapping_array, gap)) { SCTP_STAT_INCR(sctps_recvdupdata); if (asoc->numduptsns < SCTP_MAX_DUP_TSNS) { /* Record a dup for the next outbound sack */ asoc->dup_tsns[asoc->numduptsns] = tsn; asoc->numduptsns++; } asoc->send_sack = 1; return (0); } /* * Check to see about the GONE flag, duplicates would cause a sack * to be sent up above */ if (((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_GONE) || (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_SOCKET_ALLGONE) || (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET)) ) { /* * wait a minute, this guy is gone, there is no longer a * receiver. Send peer an ABORT! */ struct mbuf *op_err; op_err = sctp_generate_invmanparam(SCTP_CAUSE_OUT_OF_RESC); sctp_abort_an_association(stcb->sctp_ep, stcb, 0, op_err, SCTP_SO_NOT_LOCKED); *abort_flag = 1; return (0); } /* * Now before going further we see if there is room. If NOT then we * MAY let one through only IF this TSN is the one we are waiting * for on a partial delivery API. */ /* now do the tests */ if (((asoc->cnt_on_all_streams + asoc->cnt_on_reasm_queue + asoc->cnt_msg_on_sb) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue)) || (((int)asoc->my_rwnd) <= 0)) { /* * When we have NO room in the rwnd we check to make sure * the reader is doing its job... */ if (stcb->sctp_socket->so_rcv.sb_cc) { /* some to read, wake-up */ #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) struct socket *so; so = SCTP_INP_SO(stcb->sctp_ep); atomic_add_int(&stcb->asoc.refcnt, 1); SCTP_TCB_UNLOCK(stcb); SCTP_SOCKET_LOCK(so, 1); SCTP_TCB_LOCK(stcb); atomic_subtract_int(&stcb->asoc.refcnt, 1); if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { /* assoc was freed while we were unlocked */ SCTP_SOCKET_UNLOCK(so, 1); return (0); } #endif sctp_sorwakeup(stcb->sctp_ep, stcb->sctp_socket); #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) SCTP_SOCKET_UNLOCK(so, 1); #endif } /* now is it in the mapping array of what we have accepted? */ if (compare_with_wrap(tsn, asoc->highest_tsn_inside_map, MAX_TSN)) { /* Nope not in the valid range dump it */ sctp_set_rwnd(stcb, asoc); if ((asoc->cnt_on_all_streams + asoc->cnt_on_reasm_queue + asoc->cnt_msg_on_sb) >= SCTP_BASE_SYSCTL(sctp_max_chunks_on_queue)) { SCTP_STAT_INCR(sctps_datadropchklmt); } else { SCTP_STAT_INCR(sctps_datadroprwnd); } indx = *break_flag; *break_flag = 1; return (0); } } strmno = ntohs(ch->dp.stream_id); if (strmno >= asoc->streamincnt) { struct sctp_paramhdr *phdr; struct mbuf *mb; mb = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) * 2), 0, M_DONTWAIT, 1, MT_DATA); if (mb != NULL) { /* add some space up front so prepend will work well */ SCTP_BUF_RESV_UF(mb, sizeof(struct sctp_chunkhdr)); phdr = mtod(mb, struct sctp_paramhdr *); /* * Error causes are just param's and this one has * two back to back phdr, one with the error type * and size, the other with the streamid and a rsvd */ SCTP_BUF_LEN(mb) = (sizeof(struct sctp_paramhdr) * 2); phdr->param_type = htons(SCTP_CAUSE_INVALID_STREAM); phdr->param_length = htons(sizeof(struct sctp_paramhdr) * 2); phdr++; /* We insert the stream in the type field */ phdr->param_type = ch->dp.stream_id; /* And set the length to 0 for the rsvd field */ phdr->param_length = 0; sctp_queue_op_err(stcb, mb); } SCTP_STAT_INCR(sctps_badsid); SCTP_TCB_LOCK_ASSERT(stcb); SCTP_SET_TSN_PRESENT(asoc->mapping_array, gap); /* EY set this tsn present in nr_sack's nr_mapping_array */ if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) { SCTP_TCB_LOCK_ASSERT(stcb); SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, gap); } if (compare_with_wrap(tsn, asoc->highest_tsn_inside_map, MAX_TSN)) { /* we have a new high score */ asoc->highest_tsn_inside_map = tsn; /* EY nr_sack version of the above */ if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) asoc->highest_tsn_inside_nr_map = tsn; if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { sctp_log_map(0, 2, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); } } if (tsn == (asoc->cumulative_tsn + 1)) { /* Update cum-ack */ asoc->cumulative_tsn = tsn; } return (0); } /* * Before we continue lets validate that we are not being fooled by * an evil attacker. We can only have 4k chunks based on our TSN * spread allowed by the mapping array 512 * 8 bits, so there is no * way our stream sequence numbers could have wrapped. We of course * only validate the FIRST fragment so the bit must be set. */ strmseq = ntohs(ch->dp.stream_sequence); #ifdef SCTP_ASOCLOG_OF_TSNS SCTP_TCB_LOCK_ASSERT(stcb); if (asoc->tsn_in_at >= SCTP_TSN_LOG_SIZE) { asoc->tsn_in_at = 0; asoc->tsn_in_wrapped = 1; } asoc->in_tsnlog[asoc->tsn_in_at].tsn = tsn; asoc->in_tsnlog[asoc->tsn_in_at].strm = strmno; asoc->in_tsnlog[asoc->tsn_in_at].seq = strmseq; asoc->in_tsnlog[asoc->tsn_in_at].sz = chk_length; asoc->in_tsnlog[asoc->tsn_in_at].flgs = chunk_flags; asoc->in_tsnlog[asoc->tsn_in_at].stcb = (void *)stcb; asoc->in_tsnlog[asoc->tsn_in_at].in_pos = asoc->tsn_in_at; asoc->in_tsnlog[asoc->tsn_in_at].in_out = 1; asoc->tsn_in_at++; #endif if ((chunk_flags & SCTP_DATA_FIRST_FRAG) && (TAILQ_EMPTY(&asoc->resetHead)) && (chunk_flags & SCTP_DATA_UNORDERED) == 0 && (compare_with_wrap(asoc->strmin[strmno].last_sequence_delivered, strmseq, MAX_SEQ) || asoc->strmin[strmno].last_sequence_delivered == strmseq)) { /* The incoming sseq is behind where we last delivered? */ SCTPDBG(SCTP_DEBUG_INDATA1, "EVIL/Broken-Dup S-SEQ:%d delivered:%d from peer, Abort!\n", strmseq, asoc->strmin[strmno].last_sequence_delivered); oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 0, M_DONTWAIT, 1, MT_DATA); if (oper) { struct sctp_paramhdr *ph; uint32_t *ippp; SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + (3 * sizeof(uint32_t)); ph = mtod(oper, struct sctp_paramhdr *); ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); ph->param_length = htons(SCTP_BUF_LEN(oper)); ippp = (uint32_t *) (ph + 1); *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_14); ippp++; *ippp = tsn; ippp++; *ippp = ((strmno << 16) | strmseq); } stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_14; sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); *abort_flag = 1; return (0); } /************************************ * From here down we may find ch-> invalid * so its a good idea NOT to use it. *************************************/ the_len = (chk_length - sizeof(struct sctp_data_chunk)); if (last_chunk == 0) { dmbuf = SCTP_M_COPYM(*m, (offset + sizeof(struct sctp_data_chunk)), the_len, M_DONTWAIT); #ifdef SCTP_MBUF_LOGGING if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) { struct mbuf *mat; mat = dmbuf; while (mat) { if (SCTP_BUF_IS_EXTENDED(mat)) { sctp_log_mb(mat, SCTP_MBUF_ICOPY); } mat = SCTP_BUF_NEXT(mat); } } #endif } else { /* We can steal the last chunk */ int l_len; dmbuf = *m; /* lop off the top part */ m_adj(dmbuf, (offset + sizeof(struct sctp_data_chunk))); if (SCTP_BUF_NEXT(dmbuf) == NULL) { l_len = SCTP_BUF_LEN(dmbuf); } else { /* * need to count up the size hopefully does not hit * this to often :-0 */ struct mbuf *lat; l_len = 0; lat = dmbuf; while (lat) { l_len += SCTP_BUF_LEN(lat); lat = SCTP_BUF_NEXT(lat); } } if (l_len > the_len) { /* Trim the end round bytes off too */ m_adj(dmbuf, -(l_len - the_len)); } } if (dmbuf == NULL) { SCTP_STAT_INCR(sctps_nomem); return (0); } if ((chunk_flags & SCTP_DATA_NOT_FRAG) == SCTP_DATA_NOT_FRAG && asoc->fragmented_delivery_inprogress == 0 && TAILQ_EMPTY(&asoc->resetHead) && ((ordered == 0) || ((asoc->strmin[strmno].last_sequence_delivered + 1) == strmseq && TAILQ_EMPTY(&asoc->strmin[strmno].inqueue)))) { /* Candidate for express delivery */ /* * Its not fragmented, No PD-API is up, Nothing in the * delivery queue, Its un-ordered OR ordered and the next to * deliver AND nothing else is stuck on the stream queue, * And there is room for it in the socket buffer. Lets just * stuff it up the buffer.... */ /* It would be nice to avoid this copy if we could :< */ sctp_alloc_a_readq(stcb, control); sctp_build_readq_entry_mac(control, stcb, asoc->context, net, tsn, protocol_id, stcb->asoc.context, strmno, strmseq, chunk_flags, dmbuf); if (control == NULL) { goto failed_express_del; } sctp_add_to_readq(stcb->sctp_ep, stcb, control, &stcb->sctp_socket->so_rcv, 1, SCTP_SO_NOT_LOCKED); /* * EY here I should check if this delivered tsn is * out_of_order, if yes then update the nr_map */ if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) { /* * EY check if the mapping_array and nr_mapping * array are consistent */ if (asoc->mapping_array_base_tsn != asoc->nr_mapping_array_base_tsn) /* * printf("EY-IN * sctp_process_a_data_chunk(5): Something * is wrong the map base tsn" "\nEY-and * nr_map base tsn should be equal."); */ /* EY debugging block */ { /* * printf("\nEY-Calculating an * nr_gap!!\nmapping_array_size = %d * nr_mapping_array_size = %d" * "\nEY-mapping_array_base = %d * nr_mapping_array_base = * %d\nEY-highest_tsn_inside_map = %d" * "highest_tsn_inside_nr_map = %d\nEY-TSN = * %d nr_gap = %d",asoc->mapping_array_size, * asoc->nr_mapping_array_size, * asoc->mapping_array_base_tsn, * asoc->nr_mapping_array_base_tsn, * asoc->highest_tsn_inside_map, * asoc->highest_tsn_inside_nr_map,tsn,nr_gap * ); */ } /* EY - not %100 sure about the lock thing */ SCTP_TCB_LOCK_ASSERT(stcb); SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, nr_gap); if (compare_with_wrap(tsn, asoc->highest_tsn_inside_nr_map, MAX_TSN)) asoc->highest_tsn_inside_nr_map = tsn; } if ((chunk_flags & SCTP_DATA_UNORDERED) == 0) { /* for ordered, bump what we delivered */ asoc->strmin[strmno].last_sequence_delivered++; } SCTP_STAT_INCR(sctps_recvexpress); if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { sctp_log_strm_del_alt(stcb, tsn, strmseq, strmno, SCTP_STR_LOG_FROM_EXPRS_DEL); } control = NULL; goto finish_express_del; } failed_express_del: /* If we reach here this is a new chunk */ chk = NULL; control = NULL; /* Express for fragmented delivery? */ if ((asoc->fragmented_delivery_inprogress) && (stcb->asoc.control_pdapi) && (asoc->str_of_pdapi == strmno) && (asoc->ssn_of_pdapi == strmseq) ) { control = stcb->asoc.control_pdapi; if ((chunk_flags & SCTP_DATA_FIRST_FRAG) == SCTP_DATA_FIRST_FRAG) { /* Can't be another first? */ goto failed_pdapi_express_del; } if (tsn == (control->sinfo_tsn + 1)) { /* Yep, we can add it on */ int end = 0; uint32_t cumack; if (chunk_flags & SCTP_DATA_LAST_FRAG) { end = 1; } cumack = asoc->cumulative_tsn; if ((cumack + 1) == tsn) cumack = tsn; if (sctp_append_to_readq(stcb->sctp_ep, stcb, control, dmbuf, end, tsn, &stcb->sctp_socket->so_rcv)) { SCTP_PRINTF("Append fails end:%d\n", end); goto failed_pdapi_express_del; } /* * EY It is appended to the read queue in prev if * block here I should check if this delivered tsn * is out_of_order, if yes then update the nr_map */ if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) { /* EY debugging block */ { /* * printf("\nEY-Calculating an * nr_gap!!\nEY-mapping_array_size = * %d nr_mapping_array_size = %d" * "\nEY-mapping_array_base = %d * nr_mapping_array_base = * %d\nEY-highest_tsn_inside_map = * %d" "highest_tsn_inside_nr_map = * %d\nEY-TSN = %d nr_gap = * %d",asoc->mapping_array_size, * asoc->nr_mapping_array_size, * asoc->mapping_array_base_tsn, * asoc->nr_mapping_array_base_tsn, * asoc->highest_tsn_inside_map, * asoc->highest_tsn_inside_nr_map,ts * n,nr_gap); */ } /* EY - not %100 sure about the lock thing */ SCTP_TCB_LOCK_ASSERT(stcb); SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, nr_gap); if (compare_with_wrap(tsn, asoc->highest_tsn_inside_nr_map, MAX_TSN)) asoc->highest_tsn_inside_nr_map = tsn; } SCTP_STAT_INCR(sctps_recvexpressm); control->sinfo_tsn = tsn; asoc->tsn_last_delivered = tsn; asoc->fragment_flags = chunk_flags; asoc->tsn_of_pdapi_last_delivered = tsn; asoc->last_flags_delivered = chunk_flags; asoc->last_strm_seq_delivered = strmseq; asoc->last_strm_no_delivered = strmno; if (end) { /* clean up the flags and such */ asoc->fragmented_delivery_inprogress = 0; if ((chunk_flags & SCTP_DATA_UNORDERED) == 0) { asoc->strmin[strmno].last_sequence_delivered++; } stcb->asoc.control_pdapi = NULL; if (TAILQ_EMPTY(&asoc->reasmqueue) == 0) { /* * There could be another message * ready */ need_reasm_check = 1; } } control = NULL; goto finish_express_del; } } failed_pdapi_express_del: control = NULL; if ((chunk_flags & SCTP_DATA_NOT_FRAG) != SCTP_DATA_NOT_FRAG) { sctp_alloc_a_chunk(stcb, chk); if (chk == NULL) { /* No memory so we drop the chunk */ SCTP_STAT_INCR(sctps_nomem); if (last_chunk == 0) { /* we copied it, free the copy */ sctp_m_freem(dmbuf); } return (0); } chk->rec.data.TSN_seq = tsn; chk->no_fr_allowed = 0; chk->rec.data.stream_seq = strmseq; chk->rec.data.stream_number = strmno; chk->rec.data.payloadtype = protocol_id; chk->rec.data.context = stcb->asoc.context; chk->rec.data.doing_fast_retransmit = 0; chk->rec.data.rcv_flags = chunk_flags; chk->asoc = asoc; chk->send_size = the_len; chk->whoTo = net; atomic_add_int(&net->ref_count, 1); chk->data = dmbuf; } else { sctp_alloc_a_readq(stcb, control); sctp_build_readq_entry_mac(control, stcb, asoc->context, net, tsn, protocol_id, stcb->asoc.context, strmno, strmseq, chunk_flags, dmbuf); if (control == NULL) { /* No memory so we drop the chunk */ SCTP_STAT_INCR(sctps_nomem); if (last_chunk == 0) { /* we copied it, free the copy */ sctp_m_freem(dmbuf); } return (0); } control->length = the_len; } /* Mark it as received */ /* Now queue it where it belongs */ if (control != NULL) { /* First a sanity check */ if (asoc->fragmented_delivery_inprogress) { /* * Ok, we have a fragmented delivery in progress if * this chunk is next to deliver OR belongs in our * view to the reassembly, the peer is evil or * broken. */ uint32_t estimate_tsn; estimate_tsn = asoc->tsn_last_delivered + 1; if (TAILQ_EMPTY(&asoc->reasmqueue) && (estimate_tsn == control->sinfo_tsn)) { /* Evil/Broke peer */ sctp_m_freem(control->data); control->data = NULL; if (control->whoFrom) { sctp_free_remote_addr(control->whoFrom); control->whoFrom = NULL; } sctp_free_a_readq(stcb, control); oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 0, M_DONTWAIT, 1, MT_DATA); if (oper) { struct sctp_paramhdr *ph; uint32_t *ippp; SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + (3 * sizeof(uint32_t)); ph = mtod(oper, struct sctp_paramhdr *); ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); ph->param_length = htons(SCTP_BUF_LEN(oper)); ippp = (uint32_t *) (ph + 1); *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_15); ippp++; *ippp = tsn; ippp++; *ippp = ((strmno << 16) | strmseq); } stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_15; sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); *abort_flag = 1; return (0); } else { if (sctp_does_tsn_belong_to_reasm(asoc, control->sinfo_tsn)) { sctp_m_freem(control->data); control->data = NULL; if (control->whoFrom) { sctp_free_remote_addr(control->whoFrom); control->whoFrom = NULL; } sctp_free_a_readq(stcb, control); oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 0, M_DONTWAIT, 1, MT_DATA); if (oper) { struct sctp_paramhdr *ph; uint32_t *ippp; SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + (3 * sizeof(uint32_t)); ph = mtod(oper, struct sctp_paramhdr *); ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); ph->param_length = htons(SCTP_BUF_LEN(oper)); ippp = (uint32_t *) (ph + 1); *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_16); ippp++; *ippp = tsn; ippp++; *ippp = ((strmno << 16) | strmseq); } stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_16; sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); *abort_flag = 1; return (0); } } } else { /* No PDAPI running */ if (!TAILQ_EMPTY(&asoc->reasmqueue)) { /* * Reassembly queue is NOT empty validate * that this tsn does not need to be in * reasembly queue. If it does then our peer * is broken or evil. */ if (sctp_does_tsn_belong_to_reasm(asoc, control->sinfo_tsn)) { sctp_m_freem(control->data); control->data = NULL; if (control->whoFrom) { sctp_free_remote_addr(control->whoFrom); control->whoFrom = NULL; } sctp_free_a_readq(stcb, control); oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 0, M_DONTWAIT, 1, MT_DATA); if (oper) { struct sctp_paramhdr *ph; uint32_t *ippp; SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + (3 * sizeof(uint32_t)); ph = mtod(oper, struct sctp_paramhdr *); ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); ph->param_length = htons(SCTP_BUF_LEN(oper)); ippp = (uint32_t *) (ph + 1); *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_17); ippp++; *ippp = tsn; ippp++; *ippp = ((strmno << 16) | strmseq); } stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_17; sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); *abort_flag = 1; return (0); } } } /* ok, if we reach here we have passed the sanity checks */ if (chunk_flags & SCTP_DATA_UNORDERED) { /* queue directly into socket buffer */ sctp_add_to_readq(stcb->sctp_ep, stcb, control, &stcb->sctp_socket->so_rcv, 1, SCTP_SO_NOT_LOCKED); /* * EY It is added to the read queue in prev if block * here I should check if this delivered tsn is * out_of_order, if yes then update the nr_map */ if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) { /* * EY check if the mapping_array and * nr_mapping array are consistent */ if (asoc->mapping_array_base_tsn != asoc->nr_mapping_array_base_tsn) /* * printf("EY-IN * sctp_process_a_data_chunk(6): * Something is wrong the map base * tsn" "\nEY-and nr_map base tsn * should be equal."); */ /* * EY - not %100 sure about the lock * thing, i think we don't need the * below, */ /* SCTP_TCB_LOCK_ASSERT(stcb); */ { /* * printf("\nEY-Calculating an * nr_gap!!\nEY-mapping_array_size = * %d nr_mapping_array_size = %d" * "\nEY-mapping_array_base = %d * nr_mapping_array_base = * %d\nEY-highest_tsn_inside_map = * %d" "highest_tsn_inside_nr_map = * %d\nEY-TSN = %d nr_gap = * %d",asoc->mapping_array_size, * asoc->nr_mapping_array_size, * asoc->mapping_array_base_tsn, * asoc->nr_mapping_array_base_tsn, * asoc->highest_tsn_inside_map, * asoc->highest_tsn_inside_nr_map,ts * n,nr_gap); */ } SCTP_TCB_LOCK_ASSERT(stcb); SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, nr_gap); if (compare_with_wrap(tsn, asoc->highest_tsn_inside_nr_map, MAX_TSN)) asoc->highest_tsn_inside_nr_map = tsn; } } else { /* * Special check for when streams are resetting. We * could be more smart about this and check the * actual stream to see if it is not being reset.. * that way we would not create a HOLB when amongst * streams being reset and those not being reset. * * We take complete messages that have a stream reset * intervening (aka the TSN is after where our * cum-ack needs to be) off and put them on a * pending_reply_queue. The reassembly ones we do * not have to worry about since they are all sorted * and proceessed by TSN order. It is only the * singletons I must worry about. */ if (((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) && ((compare_with_wrap(tsn, liste->tsn, MAX_TSN))) ) { /* * yep its past where we need to reset... go * ahead and queue it. */ if (TAILQ_EMPTY(&asoc->pending_reply_queue)) { /* first one on */ TAILQ_INSERT_TAIL(&asoc->pending_reply_queue, control, next); } else { struct sctp_queued_to_read *ctlOn; unsigned char inserted = 0; ctlOn = TAILQ_FIRST(&asoc->pending_reply_queue); while (ctlOn) { if (compare_with_wrap(control->sinfo_tsn, ctlOn->sinfo_tsn, MAX_TSN)) { ctlOn = TAILQ_NEXT(ctlOn, next); } else { /* found it */ TAILQ_INSERT_BEFORE(ctlOn, control, next); inserted = 1; break; } } if (inserted == 0) { /* * must be put at end, use * prevP (all setup from * loop) to setup nextP. */ TAILQ_INSERT_TAIL(&asoc->pending_reply_queue, control, next); } } } else { sctp_queue_data_to_stream(stcb, asoc, control, abort_flag); if (*abort_flag) { return (0); } } } } else { /* Into the re-assembly queue */ sctp_queue_data_for_reasm(stcb, asoc, chk, abort_flag); if (*abort_flag) { /* * the assoc is now gone and chk was put onto the * reasm queue, which has all been freed. */ *m = NULL; return (0); } } finish_express_del: if (compare_with_wrap(tsn, asoc->highest_tsn_inside_map, MAX_TSN)) { /* we have a new high score */ asoc->highest_tsn_inside_map = tsn; if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { sctp_log_map(0, 2, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); } } if (tsn == (asoc->cumulative_tsn + 1)) { /* Update cum-ack */ asoc->cumulative_tsn = tsn; } if (last_chunk) { *m = NULL; } if (ordered) { SCTP_STAT_INCR_COUNTER64(sctps_inorderchunks); } else { SCTP_STAT_INCR_COUNTER64(sctps_inunorderchunks); } SCTP_STAT_INCR(sctps_recvdata); /* Set it present please */ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_STR_LOGGING_ENABLE) { sctp_log_strm_del_alt(stcb, tsn, strmseq, strmno, SCTP_STR_LOG_FROM_MARK_TSN); } if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { sctp_log_map(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, asoc->highest_tsn_inside_map, SCTP_MAP_PREPARE_SLIDE); } SCTP_TCB_LOCK_ASSERT(stcb); SCTP_SET_TSN_PRESENT(asoc->mapping_array, gap); /* check the special flag for stream resets */ if (((liste = TAILQ_FIRST(&asoc->resetHead)) != NULL) && ((compare_with_wrap(asoc->cumulative_tsn, liste->tsn, MAX_TSN)) || (asoc->cumulative_tsn == liste->tsn)) ) { /* * we have finished working through the backlogged TSN's now * time to reset streams. 1: call reset function. 2: free * pending_reply space 3: distribute any chunks in * pending_reply_queue. */ struct sctp_queued_to_read *ctl; sctp_reset_in_stream(stcb, liste->number_entries, liste->req.list_of_streams); TAILQ_REMOVE(&asoc->resetHead, liste, next_resp); SCTP_FREE(liste, SCTP_M_STRESET); /* sa_ignore FREED_MEMORY */ liste = TAILQ_FIRST(&asoc->resetHead); ctl = TAILQ_FIRST(&asoc->pending_reply_queue); if (ctl && (liste == NULL)) { /* All can be removed */ while (ctl) { TAILQ_REMOVE(&asoc->pending_reply_queue, ctl, next); sctp_queue_data_to_stream(stcb, asoc, ctl, abort_flag); if (*abort_flag) { return (0); } ctl = TAILQ_FIRST(&asoc->pending_reply_queue); } } else if (ctl) { /* more than one in queue */ while (!compare_with_wrap(ctl->sinfo_tsn, liste->tsn, MAX_TSN)) { /* * if ctl->sinfo_tsn is <= liste->tsn we can * process it which is the NOT of * ctl->sinfo_tsn > liste->tsn */ TAILQ_REMOVE(&asoc->pending_reply_queue, ctl, next); sctp_queue_data_to_stream(stcb, asoc, ctl, abort_flag); if (*abort_flag) { return (0); } ctl = TAILQ_FIRST(&asoc->pending_reply_queue); } } /* * Now service re-assembly to pick up anything that has been * held on reassembly queue? */ sctp_deliver_reasm_check(stcb, asoc); need_reasm_check = 0; } if (need_reasm_check) { /* Another one waits ? */ sctp_deliver_reasm_check(stcb, asoc); } return (1); } int8_t sctp_map_lookup_tab[256] = { -1, 0, -1, 1, -1, 0, -1, 2, -1, 0, -1, 1, -1, 0, -1, 3, -1, 0, -1, 1, -1, 0, -1, 2, -1, 0, -1, 1, -1, 0, -1, 4, -1, 0, -1, 1, -1, 0, -1, 2, -1, 0, -1, 1, -1, 0, -1, 3, -1, 0, -1, 1, -1, 0, -1, 2, -1, 0, -1, 1, -1, 0, -1, 5, -1, 0, -1, 1, -1, 0, -1, 2, -1, 0, -1, 1, -1, 0, -1, 3, -1, 0, -1, 1, -1, 0, -1, 2, -1, 0, -1, 1, -1, 0, -1, 4, -1, 0, -1, 1, -1, 0, -1, 2, -1, 0, -1, 1, -1, 0, -1, 3, -1, 0, -1, 1, -1, 0, -1, 2, -1, 0, -1, 1, -1, 0, -1, 6, -1, 0, -1, 1, -1, 0, -1, 2, -1, 0, -1, 1, -1, 0, -1, 3, -1, 0, -1, 1, -1, 0, -1, 2, -1, 0, -1, 1, -1, 0, -1, 4, -1, 0, -1, 1, -1, 0, -1, 2, -1, 0, -1, 1, -1, 0, -1, 3, -1, 0, -1, 1, -1, 0, -1, 2, -1, 0, -1, 1, -1, 0, -1, 5, -1, 0, -1, 1, -1, 0, -1, 2, -1, 0, -1, 1, -1, 0, -1, 3, -1, 0, -1, 1, -1, 0, -1, 2, -1, 0, -1, 1, -1, 0, -1, 4, -1, 0, -1, 1, -1, 0, -1, 2, -1, 0, -1, 1, -1, 0, -1, 3, -1, 0, -1, 1, -1, 0, -1, 2, -1, 0, -1, 1, -1, 0, -1, 7, }; void sctp_sack_check(struct sctp_tcb *stcb, int ok_to_sack, int was_a_gap, int *abort_flag) { /* * Now we also need to check the mapping array in a couple of ways. * 1) Did we move the cum-ack point? */ struct sctp_association *asoc; int at; int last_all_ones = 0; int slide_from, slide_end, lgap, distance; /* EY nr_mapping array variables */ int nr_at; int nr_last_all_ones = 0; int nr_slide_from, nr_slide_end, nr_lgap, nr_distance; uint32_t old_cumack, old_base, old_highest; unsigned char aux_array[64]; /* * EY! Don't think this is required but I am immitating the code for * map just to make sure */ unsigned char nr_aux_array[64]; asoc = &stcb->asoc; at = 0; old_cumack = asoc->cumulative_tsn; old_base = asoc->mapping_array_base_tsn; old_highest = asoc->highest_tsn_inside_map; if (asoc->mapping_array_size < 64) memcpy(aux_array, asoc->mapping_array, asoc->mapping_array_size); else memcpy(aux_array, asoc->mapping_array, 64); /* EY do the same for nr_mapping_array */ if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) { if (asoc->nr_mapping_array_size != asoc->mapping_array_size) { /* * printf("\nEY-IN sack_check method: \nEY-" "The * size of map and nr_map are inconsitent") */ ; } if (asoc->nr_mapping_array_base_tsn != asoc->mapping_array_base_tsn) { /* * printf("\nEY-IN sack_check method VERY CRUCIAL * error: \nEY-" "The base tsns of map and nr_map * are inconsitent") */ ; } /* EY! just immitating the above code */ if (asoc->nr_mapping_array_size < 64) memcpy(nr_aux_array, asoc->nr_mapping_array, asoc->nr_mapping_array_size); else memcpy(aux_array, asoc->nr_mapping_array, 64); } /* * We could probably improve this a small bit by calculating the * offset of the current cum-ack as the starting point. */ at = 0; for (slide_from = 0; slide_from < stcb->asoc.mapping_array_size; slide_from++) { if (asoc->mapping_array[slide_from] == 0xff) { at += 8; last_all_ones = 1; } else { /* there is a 0 bit */ at += sctp_map_lookup_tab[asoc->mapping_array[slide_from]]; last_all_ones = 0; break; } } asoc->cumulative_tsn = asoc->mapping_array_base_tsn + (at - last_all_ones); /* at is one off, since in the table a embedded -1 is present */ at++; if (compare_with_wrap(asoc->cumulative_tsn, asoc->highest_tsn_inside_map, MAX_TSN)) { #ifdef INVARIANTS panic("huh, cumack 0x%x greater than high-tsn 0x%x in map", asoc->cumulative_tsn, asoc->highest_tsn_inside_map); #else SCTP_PRINTF("huh, cumack 0x%x greater than high-tsn 0x%x in map - should panic?\n", asoc->cumulative_tsn, asoc->highest_tsn_inside_map); if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { sctp_log_map(0, 6, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); } asoc->highest_tsn_inside_map = asoc->cumulative_tsn; asoc->highest_tsn_inside_nr_map = asoc->cumulative_tsn; #endif } if ((asoc->cumulative_tsn == asoc->highest_tsn_inside_map) && (at >= 8)) { /* The complete array was completed by a single FR */ /* higest becomes the cum-ack */ int clr; asoc->cumulative_tsn = asoc->highest_tsn_inside_map; /* clear the array */ clr = (at >> 3) + 1; if (clr > asoc->mapping_array_size) { clr = asoc->mapping_array_size; } memset(asoc->mapping_array, 0, clr); /* base becomes one ahead of the cum-ack */ asoc->mapping_array_base_tsn = asoc->cumulative_tsn + 1; if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) { if (clr > asoc->nr_mapping_array_size) clr = asoc->nr_mapping_array_size; memset(asoc->nr_mapping_array, 0, clr); /* base becomes one ahead of the cum-ack */ asoc->nr_mapping_array_base_tsn = asoc->cumulative_tsn + 1; asoc->highest_tsn_inside_nr_map = asoc->cumulative_tsn; } if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { sctp_log_map(old_base, old_cumack, old_highest, SCTP_MAP_PREPARE_SLIDE); sctp_log_map(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_CLEARED); } } else if (at >= 8) { /* we can slide the mapping array down */ /* slide_from holds where we hit the first NON 0xff byte */ /* * now calculate the ceiling of the move using our highest * TSN value */ if (asoc->highest_tsn_inside_map >= asoc->mapping_array_base_tsn) { lgap = asoc->highest_tsn_inside_map - asoc->mapping_array_base_tsn; } else { lgap = (MAX_TSN - asoc->mapping_array_base_tsn) + asoc->highest_tsn_inside_map + 1; } slide_end = lgap >> 3; if (slide_end < slide_from) { #ifdef INVARIANTS panic("impossible slide"); #else printf("impossible slide?\n"); return; #endif } if (slide_end > asoc->mapping_array_size) { #ifdef INVARIANTS panic("would overrun buffer"); #else printf("Gak, would have overrun map end:%d slide_end:%d\n", asoc->mapping_array_size, slide_end); slide_end = asoc->mapping_array_size; #endif } distance = (slide_end - slide_from) + 1; if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { sctp_log_map(old_base, old_cumack, old_highest, SCTP_MAP_PREPARE_SLIDE); sctp_log_map((uint32_t) slide_from, (uint32_t) slide_end, (uint32_t) lgap, SCTP_MAP_SLIDE_FROM); } if (distance + slide_from > asoc->mapping_array_size || distance < 0) { /* * Here we do NOT slide forward the array so that * hopefully when more data comes in to fill it up * we will be able to slide it forward. Really I * don't think this should happen :-0 */ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { sctp_log_map((uint32_t) distance, (uint32_t) slide_from, (uint32_t) asoc->mapping_array_size, SCTP_MAP_SLIDE_NONE); } } else { int ii; for (ii = 0; ii < distance; ii++) { asoc->mapping_array[ii] = asoc->mapping_array[slide_from + ii]; } for (ii = distance; ii <= slide_end; ii++) { asoc->mapping_array[ii] = 0; } asoc->mapping_array_base_tsn += (slide_from << 3); if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { sctp_log_map(asoc->mapping_array_base_tsn, asoc->cumulative_tsn, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); } } } /* * EY if doing nr_sacks then slide the nr_mapping_array accordingly * please */ if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) { nr_at = 0; for (nr_slide_from = 0; nr_slide_from < stcb->asoc.nr_mapping_array_size; nr_slide_from++) { if (asoc->nr_mapping_array[nr_slide_from] == 0xff) { nr_at += 8; nr_last_all_ones = 1; } else { /* there is a 0 bit */ nr_at += sctp_map_lookup_tab[asoc->nr_mapping_array[nr_slide_from]]; nr_last_all_ones = 0; break; } } nr_at++; if (compare_with_wrap(asoc->cumulative_tsn, asoc->highest_tsn_inside_nr_map, MAX_TSN) && (at >= 8)) { /* The complete array was completed by a single FR */ /* higest becomes the cum-ack */ int clr; clr = (nr_at >> 3) + 1; if (clr > asoc->nr_mapping_array_size) clr = asoc->nr_mapping_array_size; memset(asoc->nr_mapping_array, 0, clr); /* base becomes one ahead of the cum-ack */ asoc->nr_mapping_array_base_tsn = asoc->cumulative_tsn + 1; asoc->highest_tsn_inside_nr_map = asoc->cumulative_tsn; } else if (nr_at >= 8) { /* we can slide the mapping array down */ /* Calculate the new byte postion we can move down */ /* * now calculate the ceiling of the move using our * highest TSN value */ if (asoc->highest_tsn_inside_nr_map >= asoc->nr_mapping_array_base_tsn) { nr_lgap = asoc->highest_tsn_inside_nr_map - asoc->nr_mapping_array_base_tsn; } else { nr_lgap = (MAX_TSN - asoc->nr_mapping_array_base_tsn) + asoc->highest_tsn_inside_nr_map + 1; } nr_slide_end = nr_lgap >> 3; if (nr_slide_end < nr_slide_from) { #ifdef INVARIANTS panic("impossible slide"); #else printf("impossible slide?\n"); return; #endif } if (nr_slide_end > asoc->nr_mapping_array_size) { #ifdef INVARIANTS panic("would overrun buffer"); #else printf("Gak, would have overrun map end:%d nr_slide_end:%d\n", asoc->nr_mapping_array_size, nr_slide_end); nr_slide_end = asoc->nr_mapping_array_size; #endif } nr_distance = (nr_slide_end - nr_slide_from) + 1; if (nr_distance + nr_slide_from > asoc->nr_mapping_array_size || nr_distance < 0) { /* * Here we do NOT slide forward the array so * that hopefully when more data comes in to * fill it up we will be able to slide it * forward. Really I don't think this should * happen :-0 */ ; } else { int ii; for (ii = 0; ii < nr_distance; ii++) { asoc->nr_mapping_array[ii] = asoc->nr_mapping_array[nr_slide_from + ii]; } for (ii = nr_distance; ii <= nr_slide_end; ii++) { asoc->nr_mapping_array[ii] = 0; } asoc->nr_mapping_array_base_tsn += (nr_slide_from << 3); } } } /* * Now we need to see if we need to queue a sack or just start the * timer (if allowed). */ if (ok_to_sack) { if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { /* * Ok special case, in SHUTDOWN-SENT case. here we * maker sure SACK timer is off and instead send a * SHUTDOWN and a SACK */ if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) { sctp_timer_stop(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL, SCTP_FROM_SCTP_INDATA + SCTP_LOC_18); } sctp_send_shutdown(stcb, stcb->asoc.primary_destination); /* * EY if nr_sacks used then send an nr-sack , a sack * otherwise */ if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) sctp_send_nr_sack(stcb); else sctp_send_sack(stcb); } else { int is_a_gap; /* is there a gap now ? */ is_a_gap = compare_with_wrap(stcb->asoc.highest_tsn_inside_map, stcb->asoc.cumulative_tsn, MAX_TSN); /* * CMT DAC algorithm: increase number of packets * received since last ack */ stcb->asoc.cmt_dac_pkts_rcvd++; if ((stcb->asoc.send_sack == 1) || /* We need to send a * SACK */ ((was_a_gap) && (is_a_gap == 0)) || /* was a gap, but no * longer is one */ (stcb->asoc.numduptsns) || /* we have dup's */ (is_a_gap) || /* is still a gap */ (stcb->asoc.delayed_ack == 0) || /* Delayed sack disabled */ (stcb->asoc.data_pkts_seen >= stcb->asoc.sack_freq) /* hit limit of pkts */ ) { if ((SCTP_BASE_SYSCTL(sctp_cmt_on_off)) && (SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) && (stcb->asoc.send_sack == 0) && (stcb->asoc.numduptsns == 0) && (stcb->asoc.delayed_ack) && (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer))) { /* * CMT DAC algorithm: With CMT, * delay acks even in the face of * * reordering. Therefore, if acks that * do not have to be sent because of * the above reasons, will be * delayed. That is, acks that would * have been sent due to gap reports * will be delayed with DAC. Start * the delayed ack timer. */ sctp_timer_start(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL); } else { /* * Ok we must build a SACK since the * timer is pending, we got our * first packet OR there are gaps or * duplicates. */ (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer); /* * EY if nr_sacks used then send an * nr-sack , a sack otherwise */ if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && stcb->asoc.peer_supports_nr_sack) sctp_send_nr_sack(stcb); else sctp_send_sack(stcb); } } else { if (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) { sctp_timer_start(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL); } } } } } void sctp_service_queues(struct sctp_tcb *stcb, struct sctp_association *asoc) { struct sctp_tmit_chunk *chk; uint32_t tsize; uint16_t nxt_todel; if (asoc->fragmented_delivery_inprogress) { sctp_service_reassembly(stcb, asoc); } /* Can we proceed further, i.e. the PD-API is complete */ if (asoc->fragmented_delivery_inprogress) { /* no */ return; } /* * Now is there some other chunk I can deliver from the reassembly * queue. */ doit_again: chk = TAILQ_FIRST(&asoc->reasmqueue); if (chk == NULL) { asoc->size_on_reasm_queue = 0; asoc->cnt_on_reasm_queue = 0; return; } nxt_todel = asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered + 1; if ((chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG) && ((nxt_todel == chk->rec.data.stream_seq) || (chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED))) { /* * Yep the first one is here. We setup to start reception, * by backing down the TSN just in case we can't deliver. */ /* * Before we start though either all of the message should * be here or 1/4 the socket buffer max or nothing on the * delivery queue and something can be delivered. */ if ((sctp_is_all_msg_on_reasm(asoc, &tsize) || (tsize >= stcb->sctp_ep->partial_delivery_point))) { asoc->fragmented_delivery_inprogress = 1; asoc->tsn_last_delivered = chk->rec.data.TSN_seq - 1; asoc->str_of_pdapi = chk->rec.data.stream_number; asoc->ssn_of_pdapi = chk->rec.data.stream_seq; asoc->pdapi_ppid = chk->rec.data.payloadtype; asoc->fragment_flags = chk->rec.data.rcv_flags; sctp_service_reassembly(stcb, asoc); if (asoc->fragmented_delivery_inprogress == 0) { goto doit_again; } } } } int sctp_process_data(struct mbuf **mm, int iphlen, int *offset, int length, struct sctphdr *sh, struct sctp_inpcb *inp, struct sctp_tcb *stcb, struct sctp_nets *net, uint32_t * high_tsn) { struct sctp_data_chunk *ch, chunk_buf; struct sctp_association *asoc; int num_chunks = 0; /* number of control chunks processed */ int stop_proc = 0; int chk_length, break_flag, last_chunk; int abort_flag = 0, was_a_gap = 0; struct mbuf *m; /* set the rwnd */ sctp_set_rwnd(stcb, &stcb->asoc); m = *mm; SCTP_TCB_LOCK_ASSERT(stcb); asoc = &stcb->asoc; if (compare_with_wrap(stcb->asoc.highest_tsn_inside_map, stcb->asoc.cumulative_tsn, MAX_TSN)) { /* there was a gap before this data was processed */ was_a_gap = 1; } /* * setup where we got the last DATA packet from for any SACK that * may need to go out. Don't bump the net. This is done ONLY when a * chunk is assigned. */ asoc->last_data_chunk_from = net; /*- * Now before we proceed we must figure out if this is a wasted * cluster... i.e. it is a small packet sent in and yet the driver * underneath allocated a full cluster for it. If so we must copy it * to a smaller mbuf and free up the cluster mbuf. This will help * with cluster starvation. Note for __Panda__ we don't do this * since it has clusters all the way down to 64 bytes. */ if (SCTP_BUF_LEN(m) < (long)MLEN && SCTP_BUF_NEXT(m) == NULL) { /* we only handle mbufs that are singletons.. not chains */ m = sctp_get_mbuf_for_msg(SCTP_BUF_LEN(m), 0, M_DONTWAIT, 1, MT_DATA); if (m) { /* ok lets see if we can copy the data up */ caddr_t *from, *to; /* get the pointers and copy */ to = mtod(m, caddr_t *); from = mtod((*mm), caddr_t *); memcpy(to, from, SCTP_BUF_LEN((*mm))); /* copy the length and free up the old */ SCTP_BUF_LEN(m) = SCTP_BUF_LEN((*mm)); sctp_m_freem(*mm); /* sucess, back copy */ *mm = m; } else { /* We are in trouble in the mbuf world .. yikes */ m = *mm; } } /* get pointer to the first chunk header */ ch = (struct sctp_data_chunk *)sctp_m_getptr(m, *offset, sizeof(struct sctp_data_chunk), (uint8_t *) & chunk_buf); if (ch == NULL) { return (1); } /* * process all DATA chunks... */ *high_tsn = asoc->cumulative_tsn; break_flag = 0; asoc->data_pkts_seen++; while (stop_proc == 0) { /* validate chunk length */ chk_length = ntohs(ch->ch.chunk_length); if (length - *offset < chk_length) { /* all done, mutulated chunk */ stop_proc = 1; break; } if (ch->ch.chunk_type == SCTP_DATA) { if ((size_t)chk_length < sizeof(struct sctp_data_chunk) + 1) { /* * Need to send an abort since we had a * invalid data chunk. */ struct mbuf *op_err; op_err = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 2 * sizeof(uint32_t)), 0, M_DONTWAIT, 1, MT_DATA); if (op_err) { struct sctp_paramhdr *ph; uint32_t *ippp; SCTP_BUF_LEN(op_err) = sizeof(struct sctp_paramhdr) + (2 * sizeof(uint32_t)); ph = mtod(op_err, struct sctp_paramhdr *); ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); ph->param_length = htons(SCTP_BUF_LEN(op_err)); ippp = (uint32_t *) (ph + 1); *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_19); ippp++; *ippp = asoc->cumulative_tsn; } stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_19; sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 0, net->port); return (2); } #ifdef SCTP_AUDITING_ENABLED sctp_audit_log(0xB1, 0); #endif if (SCTP_SIZE32(chk_length) == (length - *offset)) { last_chunk = 1; } else { last_chunk = 0; } if (sctp_process_a_data_chunk(stcb, asoc, mm, *offset, ch, chk_length, net, high_tsn, &abort_flag, &break_flag, last_chunk)) { num_chunks++; } if (abort_flag) return (2); if (break_flag) { /* * Set because of out of rwnd space and no * drop rep space left. */ stop_proc = 1; break; } } else { /* not a data chunk in the data region */ switch (ch->ch.chunk_type) { case SCTP_INITIATION: case SCTP_INITIATION_ACK: case SCTP_SELECTIVE_ACK: case SCTP_NR_SELECTIVE_ACK: /* EY */ case SCTP_HEARTBEAT_REQUEST: case SCTP_HEARTBEAT_ACK: case SCTP_ABORT_ASSOCIATION: case SCTP_SHUTDOWN: case SCTP_SHUTDOWN_ACK: case SCTP_OPERATION_ERROR: case SCTP_COOKIE_ECHO: case SCTP_COOKIE_ACK: case SCTP_ECN_ECHO: case SCTP_ECN_CWR: case SCTP_SHUTDOWN_COMPLETE: case SCTP_AUTHENTICATION: case SCTP_ASCONF_ACK: case SCTP_PACKET_DROPPED: case SCTP_STREAM_RESET: case SCTP_FORWARD_CUM_TSN: case SCTP_ASCONF: /* * Now, what do we do with KNOWN chunks that * are NOT in the right place? * * For now, I do nothing but ignore them. We * may later want to add sysctl stuff to * switch out and do either an ABORT() or * possibly process them. */ if (SCTP_BASE_SYSCTL(sctp_strict_data_order)) { struct mbuf *op_err; op_err = sctp_generate_invmanparam(SCTP_CAUSE_PROTOCOL_VIOLATION); sctp_abort_association(inp, stcb, m, iphlen, sh, op_err, 0, net->port); return (2); } break; default: /* unknown chunk type, use bit rules */ if (ch->ch.chunk_type & 0x40) { /* Add a error report to the queue */ struct mbuf *merr; struct sctp_paramhdr *phd; merr = sctp_get_mbuf_for_msg(sizeof(*phd), 0, M_DONTWAIT, 1, MT_DATA); if (merr) { phd = mtod(merr, struct sctp_paramhdr *); /* * We cheat and use param * type since we did not * bother to define a error * cause struct. They are * the same basic format * with different names. */ phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK); phd->param_length = htons(chk_length + sizeof(*phd)); SCTP_BUF_LEN(merr) = sizeof(*phd); SCTP_BUF_NEXT(merr) = SCTP_M_COPYM(m, *offset, SCTP_SIZE32(chk_length), M_DONTWAIT); if (SCTP_BUF_NEXT(merr)) { sctp_queue_op_err(stcb, merr); } else { sctp_m_freem(merr); } } } if ((ch->ch.chunk_type & 0x80) == 0) { /* discard the rest of this packet */ stop_proc = 1; } /* else skip this bad chunk and * continue... */ break; }; /* switch of chunk type */ } *offset += SCTP_SIZE32(chk_length); if ((*offset >= length) || stop_proc) { /* no more data left in the mbuf chain */ stop_proc = 1; continue; } ch = (struct sctp_data_chunk *)sctp_m_getptr(m, *offset, sizeof(struct sctp_data_chunk), (uint8_t *) & chunk_buf); if (ch == NULL) { *offset = length; stop_proc = 1; break; } } /* while */ if (break_flag) { /* * we need to report rwnd overrun drops. */ sctp_send_packet_dropped(stcb, net, *mm, iphlen, 0); } if (num_chunks) { /* * Did we get data, if so update the time for auto-close and * give peer credit for being alive. */ SCTP_STAT_INCR(sctps_recvpktwithdata); if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { sctp_misc_ints(SCTP_THRESHOLD_CLEAR, stcb->asoc.overall_error_count, 0, SCTP_FROM_SCTP_INDATA, __LINE__); } stcb->asoc.overall_error_count = 0; (void)SCTP_GETTIME_TIMEVAL(&stcb->asoc.time_last_rcvd); } /* now service all of the reassm queue if needed */ if (!(TAILQ_EMPTY(&asoc->reasmqueue))) sctp_service_queues(stcb, asoc); if (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_SENT) { /* Assure that we ack right away */ stcb->asoc.send_sack = 1; } /* Start a sack timer or QUEUE a SACK for sending */ if ((stcb->asoc.cumulative_tsn == stcb->asoc.highest_tsn_inside_map) && (stcb->asoc.mapping_array[0] != 0xff)) { if ((stcb->asoc.data_pkts_seen >= stcb->asoc.sack_freq) || (stcb->asoc.delayed_ack == 0) || (stcb->asoc.numduptsns) || (stcb->asoc.send_sack == 1)) { if (SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) { (void)SCTP_OS_TIMER_STOP(&stcb->asoc.dack_timer.timer); } /* * EY if nr_sacks used then send an nr-sack , a sack * otherwise */ if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && stcb->asoc.peer_supports_nr_sack) sctp_send_nr_sack(stcb); else sctp_send_sack(stcb); } else { if (!SCTP_OS_TIMER_PENDING(&stcb->asoc.dack_timer.timer)) { sctp_timer_start(SCTP_TIMER_TYPE_RECV, stcb->sctp_ep, stcb, NULL); } } } else { sctp_sack_check(stcb, 1, was_a_gap, &abort_flag); } if (abort_flag) return (2); return (0); } static void sctp_handle_segments(struct mbuf *m, int *offset, struct sctp_tcb *stcb, struct sctp_association *asoc, struct sctp_sack_chunk *ch, uint32_t last_tsn, uint32_t * biggest_tsn_acked, uint32_t * biggest_newly_acked_tsn, uint32_t * this_sack_lowest_newack, int num_seg, int *ecn_seg_sums) { /************************************************/ /* process fragments and update sendqueue */ /************************************************/ struct sctp_sack *sack; struct sctp_gap_ack_block *frag, block; struct sctp_tmit_chunk *tp1; int i, j; unsigned int theTSN; int num_frs = 0; uint16_t frag_strt, frag_end, primary_flag_set; u_long last_frag_high; /* * @@@ JRI : TODO: This flag is not used anywhere .. remove? */ if (asoc->primary_destination->dest_state & SCTP_ADDR_SWITCH_PRIMARY) { primary_flag_set = 1; } else { primary_flag_set = 0; } sack = &ch->sack; frag = (struct sctp_gap_ack_block *)sctp_m_getptr(m, *offset, sizeof(struct sctp_gap_ack_block), (uint8_t *) & block); *offset += sizeof(block); if (frag == NULL) { return; } tp1 = NULL; last_frag_high = 0; for (i = 0; i < num_seg; i++) { frag_strt = ntohs(frag->start); frag_end = ntohs(frag->end); /* some sanity checks on the fragment offsets */ if (frag_strt > frag_end) { /* this one is malformed, skip */ frag++; continue; } if (compare_with_wrap((frag_end + last_tsn), *biggest_tsn_acked, MAX_TSN)) *biggest_tsn_acked = frag_end + last_tsn; /* mark acked dgs and find out the highestTSN being acked */ if (tp1 == NULL) { tp1 = TAILQ_FIRST(&asoc->sent_queue); /* save the locations of the last frags */ last_frag_high = frag_end + last_tsn; } else { /* * now lets see if we need to reset the queue due to * a out-of-order SACK fragment */ if (compare_with_wrap(frag_strt + last_tsn, last_frag_high, MAX_TSN)) { /* * if the new frag starts after the last TSN * frag covered, we are ok and this one is * beyond the last one */ ; } else { /* * ok, they have reset us, so we need to * reset the queue this will cause extra * hunting but hey, they chose the * performance hit when they failed to order * their gaps */ tp1 = TAILQ_FIRST(&asoc->sent_queue); } last_frag_high = frag_end + last_tsn; } for (j = frag_strt; j <= frag_end; j++) { theTSN = j + last_tsn; while (tp1) { if (tp1->rec.data.doing_fast_retransmit) num_frs++; /* * CMT: CUCv2 algorithm. For each TSN being * processed from the sent queue, track the * next expected pseudo-cumack, or * rtx_pseudo_cumack, if required. Separate * cumack trackers for first transmissions, * and retransmissions. */ if ((tp1->whoTo->find_pseudo_cumack == 1) && (tp1->sent < SCTP_DATAGRAM_RESEND) && (tp1->snd_count == 1)) { tp1->whoTo->pseudo_cumack = tp1->rec.data.TSN_seq; tp1->whoTo->find_pseudo_cumack = 0; } if ((tp1->whoTo->find_rtx_pseudo_cumack == 1) && (tp1->sent < SCTP_DATAGRAM_RESEND) && (tp1->snd_count > 1)) { tp1->whoTo->rtx_pseudo_cumack = tp1->rec.data.TSN_seq; tp1->whoTo->find_rtx_pseudo_cumack = 0; } if (tp1->rec.data.TSN_seq == theTSN) { if (tp1->sent != SCTP_DATAGRAM_UNSENT) { /* * must be held until * cum-ack passes */ /* * ECN Nonce: Add the nonce * value to the sender's * nonce sum */ if (tp1->sent < SCTP_DATAGRAM_RESEND) { /*- * If it is less than RESEND, it is * now no-longer in flight. * Higher values may already be set * via previous Gap Ack Blocks... * i.e. ACKED or RESEND. */ if (compare_with_wrap(tp1->rec.data.TSN_seq, *biggest_newly_acked_tsn, MAX_TSN)) { *biggest_newly_acked_tsn = tp1->rec.data.TSN_seq; } /* * CMT: SFR algo * (and HTNA) - set * saw_newack to 1 * for dest being * newly acked. * update * this_sack_highest_ * newack if * appropriate. */ if (tp1->rec.data.chunk_was_revoked == 0) tp1->whoTo->saw_newack = 1; if (compare_with_wrap(tp1->rec.data.TSN_seq, tp1->whoTo->this_sack_highest_newack, MAX_TSN)) { tp1->whoTo->this_sack_highest_newack = tp1->rec.data.TSN_seq; } /* * CMT DAC algo: * also update * this_sack_lowest_n * ewack */ if (*this_sack_lowest_newack == 0) { if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { sctp_log_sack(*this_sack_lowest_newack, last_tsn, tp1->rec.data.TSN_seq, 0, 0, SCTP_LOG_TSN_ACKED); } *this_sack_lowest_newack = tp1->rec.data.TSN_seq; } /* * CMT: CUCv2 * algorithm. If * (rtx-)pseudo-cumac * k for corresp * dest is being * acked, then we * have a new * (rtx-)pseudo-cumac * k. Set * new_(rtx_)pseudo_c * umack to TRUE so * that the cwnd for * this dest can be * updated. Also * trigger search * for the next * expected * (rtx-)pseudo-cumac * k. Separate * pseudo_cumack * trackers for * first * transmissions and * retransmissions. */ if (tp1->rec.data.TSN_seq == tp1->whoTo->pseudo_cumack) { if (tp1->rec.data.chunk_was_revoked == 0) { tp1->whoTo->new_pseudo_cumack = 1; } tp1->whoTo->find_pseudo_cumack = 1; } if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK); } if (tp1->rec.data.TSN_seq == tp1->whoTo->rtx_pseudo_cumack) { if (tp1->rec.data.chunk_was_revoked == 0) { tp1->whoTo->new_pseudo_cumack = 1; } tp1->whoTo->find_rtx_pseudo_cumack = 1; } if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { sctp_log_sack(*biggest_newly_acked_tsn, last_tsn, tp1->rec.data.TSN_seq, frag_strt, frag_end, SCTP_LOG_TSN_ACKED); } if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_GAP, tp1->whoTo->flight_size, tp1->book_size, (uintptr_t) tp1->whoTo, tp1->rec.data.TSN_seq); } sctp_flight_size_decrease(tp1); sctp_total_flight_decrease(stcb, tp1); tp1->whoTo->net_ack += tp1->send_size; if (tp1->snd_count < 2) { /* * True * non-retran * smited * chunk */ tp1->whoTo->net_ack2 += tp1->send_size; /* * update RTO * too ? */ if (tp1->do_rtt) { tp1->whoTo->RTO = sctp_calculate_rto(stcb, asoc, tp1->whoTo, &tp1->sent_rcv_time, sctp_align_safe_nocopy); tp1->do_rtt = 0; } } } if (tp1->sent <= SCTP_DATAGRAM_RESEND) { (*ecn_seg_sums) += tp1->rec.data.ect_nonce; (*ecn_seg_sums) &= SCTP_SACK_NONCE_SUM; if (compare_with_wrap(tp1->rec.data.TSN_seq, asoc->this_sack_highest_gap, MAX_TSN)) { asoc->this_sack_highest_gap = tp1->rec.data.TSN_seq; } if (tp1->sent == SCTP_DATAGRAM_RESEND) { sctp_ucount_decr(asoc->sent_queue_retran_cnt); #ifdef SCTP_AUDITING_ENABLED sctp_audit_log(0xB2, (asoc->sent_queue_retran_cnt & 0x000000ff)); #endif } } /* * All chunks NOT UNSENT * fall through here and are * marked */ tp1->sent = SCTP_DATAGRAM_MARKED; if (tp1->rec.data.chunk_was_revoked) { /* deflate the cwnd */ tp1->whoTo->cwnd -= tp1->book_size; tp1->rec.data.chunk_was_revoked = 0; } } break; } /* if (tp1->TSN_seq == theTSN) */ if (compare_with_wrap(tp1->rec.data.TSN_seq, theTSN, MAX_TSN)) break; tp1 = TAILQ_NEXT(tp1, sctp_next); } /* end while (tp1) */ } /* end for (j = fragStart */ frag = (struct sctp_gap_ack_block *)sctp_m_getptr(m, *offset, sizeof(struct sctp_gap_ack_block), (uint8_t *) & block); *offset += sizeof(block); if (frag == NULL) { break; } } if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { if (num_frs) sctp_log_fr(*biggest_tsn_acked, *biggest_newly_acked_tsn, last_tsn, SCTP_FR_LOG_BIGGEST_TSNS); } } static void sctp_check_for_revoked(struct sctp_tcb *stcb, struct sctp_association *asoc, uint32_t cumack, u_long biggest_tsn_acked) { struct sctp_tmit_chunk *tp1; int tot_revoked = 0; tp1 = TAILQ_FIRST(&asoc->sent_queue); while (tp1) { if (compare_with_wrap(tp1->rec.data.TSN_seq, cumack, MAX_TSN)) { /* * ok this guy is either ACK or MARKED. If it is * ACKED it has been previously acked but not this * time i.e. revoked. If it is MARKED it was ACK'ed * again. */ if (compare_with_wrap(tp1->rec.data.TSN_seq, biggest_tsn_acked, MAX_TSN)) break; if (tp1->sent == SCTP_DATAGRAM_ACKED) { /* it has been revoked */ tp1->sent = SCTP_DATAGRAM_SENT; tp1->rec.data.chunk_was_revoked = 1; /* * We must add this stuff back in to assure * timers and such get started. */ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE, tp1->whoTo->flight_size, tp1->book_size, (uintptr_t) tp1->whoTo, tp1->rec.data.TSN_seq); } sctp_flight_size_increase(tp1); sctp_total_flight_increase(stcb, tp1); /* * We inflate the cwnd to compensate for our * artificial inflation of the flight_size. */ tp1->whoTo->cwnd += tp1->book_size; tot_revoked++; if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { sctp_log_sack(asoc->last_acked_seq, cumack, tp1->rec.data.TSN_seq, 0, 0, SCTP_LOG_TSN_REVOKED); } } else if (tp1->sent == SCTP_DATAGRAM_MARKED) { /* it has been re-acked in this SACK */ tp1->sent = SCTP_DATAGRAM_ACKED; } } if (tp1->sent == SCTP_DATAGRAM_UNSENT) break; tp1 = TAILQ_NEXT(tp1, sctp_next); } if (tot_revoked > 0) { /* * Setup the ecn nonce re-sync point. We do this since once * data is revoked we begin to retransmit things, which do * NOT have the ECN bits set. This means we are now out of * sync and must wait until we get back in sync with the * peer to check ECN bits. */ tp1 = TAILQ_FIRST(&asoc->send_queue); if (tp1 == NULL) { asoc->nonce_resync_tsn = asoc->sending_seq; } else { asoc->nonce_resync_tsn = tp1->rec.data.TSN_seq; } asoc->nonce_wait_for_ecne = 0; asoc->nonce_sum_check = 0; } } static void sctp_strike_gap_ack_chunks(struct sctp_tcb *stcb, struct sctp_association *asoc, u_long biggest_tsn_acked, u_long biggest_tsn_newly_acked, u_long this_sack_lowest_newack, int accum_moved) { struct sctp_tmit_chunk *tp1; int strike_flag = 0; struct timeval now; int tot_retrans = 0; uint32_t sending_seq; struct sctp_nets *net; int num_dests_sacked = 0; /* * select the sending_seq, this is either the next thing ready to be * sent but not transmitted, OR, the next seq we assign. */ tp1 = TAILQ_FIRST(&stcb->asoc.send_queue); if (tp1 == NULL) { sending_seq = asoc->sending_seq; } else { sending_seq = tp1->rec.data.TSN_seq; } /* CMT DAC algo: finding out if SACK is a mixed SACK */ if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) { TAILQ_FOREACH(net, &asoc->nets, sctp_next) { if (net->saw_newack) num_dests_sacked++; } } if (stcb->asoc.peer_supports_prsctp) { (void)SCTP_GETTIME_TIMEVAL(&now); } tp1 = TAILQ_FIRST(&asoc->sent_queue); while (tp1) { strike_flag = 0; if (tp1->no_fr_allowed) { /* this one had a timeout or something */ tp1 = TAILQ_NEXT(tp1, sctp_next); continue; } if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { if (tp1->sent < SCTP_DATAGRAM_RESEND) sctp_log_fr(biggest_tsn_newly_acked, tp1->rec.data.TSN_seq, tp1->sent, SCTP_FR_LOG_CHECK_STRIKE); } if (compare_with_wrap(tp1->rec.data.TSN_seq, biggest_tsn_acked, MAX_TSN) || tp1->sent == SCTP_DATAGRAM_UNSENT) { /* done */ break; } if (stcb->asoc.peer_supports_prsctp) { if ((PR_SCTP_TTL_ENABLED(tp1->flags)) && tp1->sent < SCTP_DATAGRAM_ACKED) { /* Is it expired? */ if ( /* * TODO sctp_constants.h needs alternative * time macros when _KERNEL is undefined. */ (timevalcmp(&now, &tp1->rec.data.timetodrop, >)) ) { /* Yes so drop it */ if (tp1->data != NULL) { (void)sctp_release_pr_sctp_chunk(stcb, tp1, (SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT), &asoc->sent_queue, SCTP_SO_NOT_LOCKED); } tp1 = TAILQ_NEXT(tp1, sctp_next); continue; } } if ((PR_SCTP_RTX_ENABLED(tp1->flags)) && tp1->sent < SCTP_DATAGRAM_ACKED) { /* Has it been retransmitted tv_sec times? */ if (tp1->snd_count > tp1->rec.data.timetodrop.tv_sec) { /* Yes, so drop it */ if (tp1->data != NULL) { (void)sctp_release_pr_sctp_chunk(stcb, tp1, (SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT), &asoc->sent_queue, SCTP_SO_NOT_LOCKED); } tp1 = TAILQ_NEXT(tp1, sctp_next); continue; } } } if (compare_with_wrap(tp1->rec.data.TSN_seq, asoc->this_sack_highest_gap, MAX_TSN)) { /* we are beyond the tsn in the sack */ break; } if (tp1->sent >= SCTP_DATAGRAM_RESEND) { /* either a RESEND, ACKED, or MARKED */ /* skip */ tp1 = TAILQ_NEXT(tp1, sctp_next); continue; } /* * CMT : SFR algo (covers part of DAC and HTNA as well) */ if (tp1->whoTo && tp1->whoTo->saw_newack == 0) { /* * No new acks were receieved for data sent to this * dest. Therefore, according to the SFR algo for * CMT, no data sent to this dest can be marked for * FR using this SACK. */ tp1 = TAILQ_NEXT(tp1, sctp_next); continue; } else if (tp1->whoTo && compare_with_wrap(tp1->rec.data.TSN_seq, tp1->whoTo->this_sack_highest_newack, MAX_TSN)) { /* * CMT: New acks were receieved for data sent to * this dest. But no new acks were seen for data * sent after tp1. Therefore, according to the SFR * algo for CMT, tp1 cannot be marked for FR using * this SACK. This step covers part of the DAC algo * and the HTNA algo as well. */ tp1 = TAILQ_NEXT(tp1, sctp_next); continue; } /* * Here we check to see if we were have already done a FR * and if so we see if the biggest TSN we saw in the sack is * smaller than the recovery point. If so we don't strike * the tsn... otherwise we CAN strike the TSN. */ /* * @@@ JRI: Check for CMT if (accum_moved && * asoc->fast_retran_loss_recovery && (sctp_cmt_on_off == * 0)) { */ if (accum_moved && asoc->fast_retran_loss_recovery) { /* * Strike the TSN if in fast-recovery and cum-ack * moved. */ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { sctp_log_fr(biggest_tsn_newly_acked, tp1->rec.data.TSN_seq, tp1->sent, SCTP_FR_LOG_STRIKE_CHUNK); } if (tp1->sent < SCTP_DATAGRAM_RESEND) { tp1->sent++; } if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) { /* * CMT DAC algorithm: If SACK flag is set to * 0, then lowest_newack test will not pass * because it would have been set to the * cumack earlier. If not already to be * rtx'd, If not a mixed sack and if tp1 is * not between two sacked TSNs, then mark by * one more. NOTE that we are marking by one * additional time since the SACK DAC flag * indicates that two packets have been * received after this missing TSN. */ if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) && compare_with_wrap(this_sack_lowest_newack, tp1->rec.data.TSN_seq, MAX_TSN)) { if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { sctp_log_fr(16 + num_dests_sacked, tp1->rec.data.TSN_seq, tp1->sent, SCTP_FR_LOG_STRIKE_CHUNK); } tp1->sent++; } } } else if ((tp1->rec.data.doing_fast_retransmit) && (SCTP_BASE_SYSCTL(sctp_cmt_on_off) == 0)) { /* * For those that have done a FR we must take * special consideration if we strike. I.e the * biggest_newly_acked must be higher than the * sending_seq at the time we did the FR. */ if ( #ifdef SCTP_FR_TO_ALTERNATE /* * If FR's go to new networks, then we must only do * this for singly homed asoc's. However if the FR's * go to the same network (Armando's work) then its * ok to FR multiple times. */ (asoc->numnets < 2) #else (1) #endif ) { if ((compare_with_wrap(biggest_tsn_newly_acked, tp1->rec.data.fast_retran_tsn, MAX_TSN)) || (biggest_tsn_newly_acked == tp1->rec.data.fast_retran_tsn)) { /* * Strike the TSN, since this ack is * beyond where things were when we * did a FR. */ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { sctp_log_fr(biggest_tsn_newly_acked, tp1->rec.data.TSN_seq, tp1->sent, SCTP_FR_LOG_STRIKE_CHUNK); } if (tp1->sent < SCTP_DATAGRAM_RESEND) { tp1->sent++; } strike_flag = 1; if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) { /* * CMT DAC algorithm: If * SACK flag is set to 0, * then lowest_newack test * will not pass because it * would have been set to * the cumack earlier. If * not already to be rtx'd, * If not a mixed sack and * if tp1 is not between two * sacked TSNs, then mark by * one more. NOTE that we * are marking by one * additional time since the * SACK DAC flag indicates * that two packets have * been received after this * missing TSN. */ if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) && compare_with_wrap(this_sack_lowest_newack, tp1->rec.data.TSN_seq, MAX_TSN)) { if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { sctp_log_fr(32 + num_dests_sacked, tp1->rec.data.TSN_seq, tp1->sent, SCTP_FR_LOG_STRIKE_CHUNK); } if (tp1->sent < SCTP_DATAGRAM_RESEND) { tp1->sent++; } } } } } /* * JRI: TODO: remove code for HTNA algo. CMT's SFR * algo covers HTNA. */ } else if (compare_with_wrap(tp1->rec.data.TSN_seq, biggest_tsn_newly_acked, MAX_TSN)) { /* * We don't strike these: This is the HTNA * algorithm i.e. we don't strike If our TSN is * larger than the Highest TSN Newly Acked. */ ; } else { /* Strike the TSN */ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { sctp_log_fr(biggest_tsn_newly_acked, tp1->rec.data.TSN_seq, tp1->sent, SCTP_FR_LOG_STRIKE_CHUNK); } if (tp1->sent < SCTP_DATAGRAM_RESEND) { tp1->sent++; } if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_use_dac)) { /* * CMT DAC algorithm: If SACK flag is set to * 0, then lowest_newack test will not pass * because it would have been set to the * cumack earlier. If not already to be * rtx'd, If not a mixed sack and if tp1 is * not between two sacked TSNs, then mark by * one more. NOTE that we are marking by one * additional time since the SACK DAC flag * indicates that two packets have been * received after this missing TSN. */ if ((tp1->sent < SCTP_DATAGRAM_RESEND) && (num_dests_sacked == 1) && compare_with_wrap(this_sack_lowest_newack, tp1->rec.data.TSN_seq, MAX_TSN)) { if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { sctp_log_fr(48 + num_dests_sacked, tp1->rec.data.TSN_seq, tp1->sent, SCTP_FR_LOG_STRIKE_CHUNK); } tp1->sent++; } } } if (tp1->sent == SCTP_DATAGRAM_RESEND) { /* Increment the count to resend */ struct sctp_nets *alt; /* printf("OK, we are now ready to FR this guy\n"); */ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { sctp_log_fr(tp1->rec.data.TSN_seq, tp1->snd_count, 0, SCTP_FR_MARKED); } if (strike_flag) { /* This is a subsequent FR */ SCTP_STAT_INCR(sctps_sendmultfastretrans); } sctp_ucount_incr(stcb->asoc.sent_queue_retran_cnt); if (SCTP_BASE_SYSCTL(sctp_cmt_on_off)) { /* * CMT: Using RTX_SSTHRESH policy for CMT. * If CMT is being used, then pick dest with * largest ssthresh for any retransmission. */ tp1->no_fr_allowed = 1; alt = tp1->whoTo; /* sa_ignore NO_NULL_CHK */ if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_pf)) { /* * JRS 5/18/07 - If CMT PF is on, * use the PF version of * find_alt_net() */ alt = sctp_find_alternate_net(stcb, alt, 2); } else { /* * JRS 5/18/07 - If only CMT is on, * use the CMT version of * find_alt_net() */ /* sa_ignore NO_NULL_CHK */ alt = sctp_find_alternate_net(stcb, alt, 1); } if (alt == NULL) { alt = tp1->whoTo; } /* * CUCv2: If a different dest is picked for * the retransmission, then new * (rtx-)pseudo_cumack needs to be tracked * for orig dest. Let CUCv2 track new (rtx-) * pseudo-cumack always. */ if (tp1->whoTo) { tp1->whoTo->find_pseudo_cumack = 1; tp1->whoTo->find_rtx_pseudo_cumack = 1; } } else {/* CMT is OFF */ #ifdef SCTP_FR_TO_ALTERNATE /* Can we find an alternate? */ alt = sctp_find_alternate_net(stcb, tp1->whoTo, 0); #else /* * default behavior is to NOT retransmit * FR's to an alternate. Armando Caro's * paper details why. */ alt = tp1->whoTo; #endif } tp1->rec.data.doing_fast_retransmit = 1; tot_retrans++; /* mark the sending seq for possible subsequent FR's */ /* * printf("Marking TSN for FR new value %x\n", * (uint32_t)tpi->rec.data.TSN_seq); */ if (TAILQ_EMPTY(&asoc->send_queue)) { /* * If the queue of send is empty then its * the next sequence number that will be * assigned so we subtract one from this to * get the one we last sent. */ tp1->rec.data.fast_retran_tsn = sending_seq; } else { /* * If there are chunks on the send queue * (unsent data that has made it from the * stream queues but not out the door, we * take the first one (which will have the * lowest TSN) and subtract one to get the * one we last sent. */ struct sctp_tmit_chunk *ttt; ttt = TAILQ_FIRST(&asoc->send_queue); tp1->rec.data.fast_retran_tsn = ttt->rec.data.TSN_seq; } if (tp1->do_rtt) { /* * this guy had a RTO calculation pending on * it, cancel it */ tp1->do_rtt = 0; } /* fix counts and things */ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_RSND, (tp1->whoTo ? (tp1->whoTo->flight_size) : 0), tp1->book_size, (uintptr_t) tp1->whoTo, tp1->rec.data.TSN_seq); } if (tp1->whoTo) { tp1->whoTo->net_ack++; sctp_flight_size_decrease(tp1); } if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { sctp_log_rwnd(SCTP_INCREASE_PEER_RWND, asoc->peers_rwnd, tp1->send_size, SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)); } /* add back to the rwnd */ asoc->peers_rwnd += (tp1->send_size + SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)); /* remove from the total flight */ sctp_total_flight_decrease(stcb, tp1); if (alt != tp1->whoTo) { /* yes, there is an alternate. */ sctp_free_remote_addr(tp1->whoTo); /* sa_ignore FREED_MEMORY */ tp1->whoTo = alt; atomic_add_int(&alt->ref_count, 1); } } tp1 = TAILQ_NEXT(tp1, sctp_next); } /* while (tp1) */ if (tot_retrans > 0) { /* * Setup the ecn nonce re-sync point. We do this since once * we go to FR something we introduce a Karn's rule scenario * and won't know the totals for the ECN bits. */ asoc->nonce_resync_tsn = sending_seq; asoc->nonce_wait_for_ecne = 0; asoc->nonce_sum_check = 0; } } struct sctp_tmit_chunk * sctp_try_advance_peer_ack_point(struct sctp_tcb *stcb, struct sctp_association *asoc) { struct sctp_tmit_chunk *tp1, *tp2, *a_adv = NULL; struct timeval now; int now_filled = 0; if (asoc->peer_supports_prsctp == 0) { return (NULL); } tp1 = TAILQ_FIRST(&asoc->sent_queue); while (tp1) { if (tp1->sent != SCTP_FORWARD_TSN_SKIP && tp1->sent != SCTP_DATAGRAM_RESEND) { /* no chance to advance, out of here */ break; } if (!PR_SCTP_ENABLED(tp1->flags)) { /* * We can't fwd-tsn past any that are reliable aka * retransmitted until the asoc fails. */ break; } if (!now_filled) { (void)SCTP_GETTIME_TIMEVAL(&now); now_filled = 1; } tp2 = TAILQ_NEXT(tp1, sctp_next); /* * now we got a chunk which is marked for another * retransmission to a PR-stream but has run out its chances * already maybe OR has been marked to skip now. Can we skip * it if its a resend? */ if (tp1->sent == SCTP_DATAGRAM_RESEND && (PR_SCTP_TTL_ENABLED(tp1->flags))) { /* * Now is this one marked for resend and its time is * now up? */ if (timevalcmp(&now, &tp1->rec.data.timetodrop, >)) { /* Yes so drop it */ if (tp1->data) { (void)sctp_release_pr_sctp_chunk(stcb, tp1, (SCTP_RESPONSE_TO_USER_REQ | SCTP_NOTIFY_DATAGRAM_SENT), &asoc->sent_queue, SCTP_SO_NOT_LOCKED); } } else { /* * No, we are done when hit one for resend * whos time as not expired. */ break; } } /* * Ok now if this chunk is marked to drop it we can clean up * the chunk, advance our peer ack point and we can check * the next chunk. */ if (tp1->sent == SCTP_FORWARD_TSN_SKIP) { /* advance PeerAckPoint goes forward */ asoc->advanced_peer_ack_point = tp1->rec.data.TSN_seq; a_adv = tp1; } else { /* * If it is still in RESEND we can advance no * further */ break; } /* * If we hit here we just dumped tp1, move to next tsn on * sent queue. */ tp1 = tp2; } return (a_adv); } static void sctp_fs_audit(struct sctp_association *asoc) { struct sctp_tmit_chunk *chk; int inflight = 0, resend = 0, inbetween = 0, acked = 0, above = 0; TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) { if (chk->sent < SCTP_DATAGRAM_RESEND) { inflight++; } else if (chk->sent == SCTP_DATAGRAM_RESEND) { resend++; } else if (chk->sent < SCTP_DATAGRAM_ACKED) { inbetween++; } else if (chk->sent > SCTP_DATAGRAM_ACKED) { above++; } else { acked++; } } if ((inflight > 0) || (inbetween > 0)) { #ifdef INVARIANTS panic("Flight size-express incorrect? \n"); #else SCTP_PRINTF("Flight size-express incorrect inflight:%d inbetween:%d\n", inflight, inbetween); #endif } } static void sctp_window_probe_recovery(struct sctp_tcb *stcb, struct sctp_association *asoc, struct sctp_nets *net, struct sctp_tmit_chunk *tp1) { struct sctp_tmit_chunk *chk; /* First setup this one and get it moved back */ tp1->sent = SCTP_DATAGRAM_UNSENT; if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_WP, tp1->whoTo->flight_size, tp1->book_size, (uintptr_t) tp1->whoTo, tp1->rec.data.TSN_seq); } sctp_flight_size_decrease(tp1); sctp_total_flight_decrease(stcb, tp1); TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next); TAILQ_INSERT_HEAD(&asoc->send_queue, tp1, sctp_next); asoc->sent_queue_cnt--; asoc->send_queue_cnt++; /* * Now all guys marked for RESEND on the sent_queue must be moved * back too. */ TAILQ_FOREACH(chk, &asoc->sent_queue, sctp_next) { if (chk->sent == SCTP_DATAGRAM_RESEND) { /* Another chunk to move */ chk->sent = SCTP_DATAGRAM_UNSENT; /* It should not be in flight */ TAILQ_REMOVE(&asoc->sent_queue, chk, sctp_next); TAILQ_INSERT_AFTER(&asoc->send_queue, tp1, chk, sctp_next); asoc->sent_queue_cnt--; asoc->send_queue_cnt++; sctp_ucount_decr(asoc->sent_queue_retran_cnt); } } } void sctp_express_handle_sack(struct sctp_tcb *stcb, uint32_t cumack, uint32_t rwnd, int nonce_sum_flag, int *abort_now) { struct sctp_nets *net; struct sctp_association *asoc; struct sctp_tmit_chunk *tp1, *tp2; uint32_t old_rwnd; int win_probe_recovery = 0; int win_probe_recovered = 0; int j, done_once = 0; if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_SACK_ARRIVALS_ENABLE) { sctp_misc_ints(SCTP_SACK_LOG_EXPRESS, cumack, rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd); } SCTP_TCB_LOCK_ASSERT(stcb); #ifdef SCTP_ASOCLOG_OF_TSNS stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cumack; stcb->asoc.cumack_log_at++; if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) { stcb->asoc.cumack_log_at = 0; } #endif asoc = &stcb->asoc; old_rwnd = asoc->peers_rwnd; if (compare_with_wrap(asoc->last_acked_seq, cumack, MAX_TSN)) { /* old ack */ return; } else if (asoc->last_acked_seq == cumack) { /* Window update sack */ asoc->peers_rwnd = sctp_sbspace_sub(rwnd, (uint32_t) (asoc->total_flight + (asoc->sent_queue_cnt * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)))); if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { /* SWS sender side engages */ asoc->peers_rwnd = 0; } if (asoc->peers_rwnd > old_rwnd) { goto again; } return; } /* First setup for CC stuff */ TAILQ_FOREACH(net, &asoc->nets, sctp_next) { net->prev_cwnd = net->cwnd; net->net_ack = 0; net->net_ack2 = 0; /* * CMT: Reset CUC and Fast recovery algo variables before * SACK processing */ net->new_pseudo_cumack = 0; net->will_exit_fast_recovery = 0; } if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) { uint32_t send_s; if (!TAILQ_EMPTY(&asoc->sent_queue)) { tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead); send_s = tp1->rec.data.TSN_seq + 1; } else { send_s = asoc->sending_seq; } if ((cumack == send_s) || compare_with_wrap(cumack, send_s, MAX_TSN)) { #ifndef INVARIANTS struct mbuf *oper; #endif #ifdef INVARIANTS panic("Impossible sack 1"); #else *abort_now = 1; /* XXX */ oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)), 0, M_DONTWAIT, 1, MT_DATA); if (oper) { struct sctp_paramhdr *ph; uint32_t *ippp; SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + sizeof(uint32_t); ph = mtod(oper, struct sctp_paramhdr *); ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); ph->param_length = htons(SCTP_BUF_LEN(oper)); ippp = (uint32_t *) (ph + 1); *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_25); } stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_25; sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); return; #endif } } asoc->this_sack_highest_gap = cumack; if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { sctp_misc_ints(SCTP_THRESHOLD_CLEAR, stcb->asoc.overall_error_count, 0, SCTP_FROM_SCTP_INDATA, __LINE__); } stcb->asoc.overall_error_count = 0; if (compare_with_wrap(cumack, asoc->last_acked_seq, MAX_TSN)) { /* process the new consecutive TSN first */ tp1 = TAILQ_FIRST(&asoc->sent_queue); while (tp1) { tp2 = TAILQ_NEXT(tp1, sctp_next); if (compare_with_wrap(cumack, tp1->rec.data.TSN_seq, MAX_TSN) || cumack == tp1->rec.data.TSN_seq) { if (tp1->sent == SCTP_DATAGRAM_UNSENT) { printf("Warning, an unsent is now acked?\n"); } /* * ECN Nonce: Add the nonce to the sender's * nonce sum */ asoc->nonce_sum_expect_base += tp1->rec.data.ect_nonce; if (tp1->sent < SCTP_DATAGRAM_ACKED) { /* * If it is less than ACKED, it is * now no-longer in flight. Higher * values may occur during marking */ if (tp1->sent < SCTP_DATAGRAM_RESEND) { if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA, tp1->whoTo->flight_size, tp1->book_size, (uintptr_t) tp1->whoTo, tp1->rec.data.TSN_seq); } sctp_flight_size_decrease(tp1); /* sa_ignore NO_NULL_CHK */ sctp_total_flight_decrease(stcb, tp1); } tp1->whoTo->net_ack += tp1->send_size; if (tp1->snd_count < 2) { /* * True non-retransmited * chunk */ tp1->whoTo->net_ack2 += tp1->send_size; /* update RTO too? */ if (tp1->do_rtt) { tp1->whoTo->RTO = /* * sa_ignore * NO_NULL_CHK */ sctp_calculate_rto(stcb, asoc, tp1->whoTo, &tp1->sent_rcv_time, sctp_align_safe_nocopy); tp1->do_rtt = 0; } } /* * CMT: CUCv2 algorithm. From the * cumack'd TSNs, for each TSN being * acked for the first time, set the * following variables for the * corresp destination. * new_pseudo_cumack will trigger a * cwnd update. * find_(rtx_)pseudo_cumack will * trigger search for the next * expected (rtx-)pseudo-cumack. */ tp1->whoTo->new_pseudo_cumack = 1; tp1->whoTo->find_pseudo_cumack = 1; tp1->whoTo->find_rtx_pseudo_cumack = 1; if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { /* sa_ignore NO_NULL_CHK */ sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK); } } if (tp1->sent == SCTP_DATAGRAM_RESEND) { sctp_ucount_decr(asoc->sent_queue_retran_cnt); } if (tp1->rec.data.chunk_was_revoked) { /* deflate the cwnd */ tp1->whoTo->cwnd -= tp1->book_size; tp1->rec.data.chunk_was_revoked = 0; } tp1->sent = SCTP_DATAGRAM_ACKED; TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next); if (tp1->data) { /* sa_ignore NO_NULL_CHK */ sctp_free_bufspace(stcb, asoc, tp1, 1); sctp_m_freem(tp1->data); } if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { sctp_log_sack(asoc->last_acked_seq, cumack, tp1->rec.data.TSN_seq, 0, 0, SCTP_LOG_FREE_SENT); } tp1->data = NULL; asoc->sent_queue_cnt--; sctp_free_a_chunk(stcb, tp1); tp1 = tp2; } else { break; } } } /* sa_ignore NO_NULL_CHK */ if (stcb->sctp_socket) { #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) struct socket *so; #endif SOCKBUF_LOCK(&stcb->sctp_socket->so_snd); if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { /* sa_ignore NO_NULL_CHK */ sctp_wakeup_log(stcb, cumack, 1, SCTP_WAKESND_FROM_SACK); } #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) so = SCTP_INP_SO(stcb->sctp_ep); atomic_add_int(&stcb->asoc.refcnt, 1); SCTP_TCB_UNLOCK(stcb); SCTP_SOCKET_LOCK(so, 1); SCTP_TCB_LOCK(stcb); atomic_subtract_int(&stcb->asoc.refcnt, 1); if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { /* assoc was freed while we were unlocked */ SCTP_SOCKET_UNLOCK(so, 1); return; } #endif sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket); #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) SCTP_SOCKET_UNLOCK(so, 1); #endif } else { if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { sctp_wakeup_log(stcb, cumack, 1, SCTP_NOWAKE_FROM_SACK); } } /* JRS - Use the congestion control given in the CC module */ if (asoc->last_acked_seq != cumack) asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, 1, 0, 0); asoc->last_acked_seq = cumack; if (TAILQ_EMPTY(&asoc->sent_queue)) { /* nothing left in-flight */ TAILQ_FOREACH(net, &asoc->nets, sctp_next) { net->flight_size = 0; net->partial_bytes_acked = 0; } asoc->total_flight = 0; asoc->total_flight_count = 0; } /* Fix up the a-p-a-p for future PR-SCTP sends */ if (compare_with_wrap(cumack, asoc->advanced_peer_ack_point, MAX_TSN)) { asoc->advanced_peer_ack_point = cumack; } /* ECN Nonce updates */ if (asoc->ecn_nonce_allowed) { if (asoc->nonce_sum_check) { if (nonce_sum_flag != ((asoc->nonce_sum_expect_base) & SCTP_SACK_NONCE_SUM)) { if (asoc->nonce_wait_for_ecne == 0) { struct sctp_tmit_chunk *lchk; lchk = TAILQ_FIRST(&asoc->send_queue); asoc->nonce_wait_for_ecne = 1; if (lchk) { asoc->nonce_wait_tsn = lchk->rec.data.TSN_seq; } else { asoc->nonce_wait_tsn = asoc->sending_seq; } } else { if (compare_with_wrap(asoc->last_acked_seq, asoc->nonce_wait_tsn, MAX_TSN) || (asoc->last_acked_seq == asoc->nonce_wait_tsn)) { /* * Misbehaving peer. We need * to react to this guy */ asoc->ecn_allowed = 0; asoc->ecn_nonce_allowed = 0; } } } } else { /* See if Resynchronization Possible */ if (compare_with_wrap(asoc->last_acked_seq, asoc->nonce_resync_tsn, MAX_TSN)) { asoc->nonce_sum_check = 1; /* * now we must calculate what the base is. * We do this based on two things, we know * the total's for all the segments * gap-acked in the SACK (none), We also * know the SACK's nonce sum, its in * nonce_sum_flag. So we can build a truth * table to back-calculate the new value of * asoc->nonce_sum_expect_base: * * SACK-flag-Value Seg-Sums Base 0 0 0 * 1 0 1 0 1 1 1 * 1 0 */ asoc->nonce_sum_expect_base = (0 ^ nonce_sum_flag) & SCTP_SACK_NONCE_SUM; } } } /* RWND update */ asoc->peers_rwnd = sctp_sbspace_sub(rwnd, (uint32_t) (asoc->total_flight + (asoc->sent_queue_cnt * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)))); if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { /* SWS sender side engages */ asoc->peers_rwnd = 0; } if (asoc->peers_rwnd > old_rwnd) { win_probe_recovery = 1; } /* Now assure a timer where data is queued at */ again: j = 0; TAILQ_FOREACH(net, &asoc->nets, sctp_next) { if (win_probe_recovery && (net->window_probe)) { net->window_probe = 0; win_probe_recovered = 1; /* * Find first chunk that was used with window probe * and clear the sent */ /* sa_ignore FREED_MEMORY */ TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { if (tp1->window_probe) { /* move back to data send queue */ sctp_window_probe_recovery(stcb, asoc, net, tp1); break; } } } if (net->flight_size) { int to_ticks; if (net->RTO == 0) { to_ticks = MSEC_TO_TICKS(stcb->asoc.initial_rto); } else { to_ticks = MSEC_TO_TICKS(net->RTO); } j++; (void)SCTP_OS_TIMER_START(&net->rxt_timer.timer, to_ticks, sctp_timeout_handler, &net->rxt_timer); } else { if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_22); } if (SCTP_BASE_SYSCTL(sctp_early_fr)) { if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) { SCTP_STAT_INCR(sctps_earlyfrstpidsck4); sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_23); } } } } if ((j == 0) && (!TAILQ_EMPTY(&asoc->sent_queue)) && (asoc->sent_queue_retran_cnt == 0) && (win_probe_recovered == 0) && (done_once == 0)) { /* huh, this should not happen */ sctp_fs_audit(asoc); TAILQ_FOREACH(net, &asoc->nets, sctp_next) { net->flight_size = 0; } asoc->total_flight = 0; asoc->total_flight_count = 0; asoc->sent_queue_retran_cnt = 0; TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { if (tp1->sent < SCTP_DATAGRAM_RESEND) { sctp_flight_size_increase(tp1); sctp_total_flight_increase(stcb, tp1); } else if (tp1->sent == SCTP_DATAGRAM_RESEND) { asoc->sent_queue_retran_cnt++; } } done_once = 1; goto again; } /**********************************/ /* Now what about shutdown issues */ /**********************************/ if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) { /* nothing left on sendqueue.. consider done */ /* clean up */ if ((asoc->stream_queue_cnt == 1) && ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) || (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) && (asoc->locked_on_sending) ) { struct sctp_stream_queue_pending *sp; /* * I may be in a state where we got all across.. but * cannot write more due to a shutdown... we abort * since the user did not indicate EOR in this case. * The sp will be cleaned during free of the asoc. */ sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue), sctp_streamhead); if ((sp) && (sp->length == 0)) { /* Let cleanup code purge it */ if (sp->msg_is_complete) { asoc->stream_queue_cnt--; } else { asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT; asoc->locked_on_sending = NULL; asoc->stream_queue_cnt--; } } } if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) && (asoc->stream_queue_cnt == 0)) { if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { /* Need to abort here */ struct mbuf *oper; abort_out_now: *abort_now = 1; /* XXX */ oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)), 0, M_DONTWAIT, 1, MT_DATA); if (oper) { struct sctp_paramhdr *ph; uint32_t *ippp; SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + sizeof(uint32_t); ph = mtod(oper, struct sctp_paramhdr *); ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT); ph->param_length = htons(SCTP_BUF_LEN(oper)); ippp = (uint32_t *) (ph + 1); *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_24); } stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_24; sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_RESPONSE_TO_USER_REQ, oper, SCTP_SO_NOT_LOCKED); } else { if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { SCTP_STAT_DECR_GAUGE32(sctps_currestab); } SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT); SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); sctp_stop_timers_for_shutdown(stcb); sctp_send_shutdown(stcb, stcb->asoc.primary_destination); sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, asoc->primary_destination); sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb, asoc->primary_destination); } } else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) && (asoc->stream_queue_cnt == 0)) { if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { goto abort_out_now; } SCTP_STAT_DECR_GAUGE32(sctps_currestab); SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, asoc->primary_destination); } } /* PR-Sctp issues need to be addressed too */ if ((asoc->peer_supports_prsctp) && (asoc->pr_sctp_cnt > 0)) { struct sctp_tmit_chunk *lchk; uint32_t old_adv_peer_ack_point; old_adv_peer_ack_point = asoc->advanced_peer_ack_point; lchk = sctp_try_advance_peer_ack_point(stcb, asoc); /* C3. See if we need to send a Fwd-TSN */ if (compare_with_wrap(asoc->advanced_peer_ack_point, cumack, MAX_TSN)) { /* * ISSUE with ECN, see FWD-TSN processing for notes * on issues that will occur when the ECN NONCE * stuff is put into SCTP for cross checking. */ if (compare_with_wrap(asoc->advanced_peer_ack_point, old_adv_peer_ack_point, MAX_TSN)) { send_forward_tsn(stcb, asoc); /* * ECN Nonce: Disable Nonce Sum check when * FWD TSN is sent and store resync tsn */ asoc->nonce_sum_check = 0; asoc->nonce_resync_tsn = asoc->advanced_peer_ack_point; } } if (lchk) { /* Assure a timer is up */ sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, lchk->whoTo); } } if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_RWND_LOGGING_ENABLE) { sctp_misc_ints(SCTP_SACK_RWND_UPDATE, rwnd, stcb->asoc.peers_rwnd, stcb->asoc.total_flight, stcb->asoc.total_output_queue_size); } } void sctp_handle_sack(struct mbuf *m, int offset, struct sctp_sack_chunk *ch, struct sctp_tcb *stcb, struct sctp_nets *net_from, int *abort_now, int sack_len, uint32_t rwnd) { struct sctp_association *asoc; struct sctp_sack *sack; struct sctp_tmit_chunk *tp1, *tp2; uint32_t cum_ack, last_tsn, biggest_tsn_acked, biggest_tsn_newly_acked, this_sack_lowest_newack; uint32_t sav_cum_ack; uint16_t num_seg, num_dup; uint16_t wake_him = 0; unsigned int sack_length; uint32_t send_s = 0; long j; int accum_moved = 0; int will_exit_fast_recovery = 0; uint32_t a_rwnd, old_rwnd; int win_probe_recovery = 0; int win_probe_recovered = 0; struct sctp_nets *net = NULL; int nonce_sum_flag, ecn_seg_sums = 0; int done_once; uint8_t reneged_all = 0; uint8_t cmt_dac_flag; /* * we take any chance we can to service our queues since we cannot * get awoken when the socket is read from :< */ /* * Now perform the actual SACK handling: 1) Verify that it is not an * old sack, if so discard. 2) If there is nothing left in the send * queue (cum-ack is equal to last acked) then you have a duplicate * too, update any rwnd change and verify no timers are running. * then return. 3) Process any new consequtive data i.e. cum-ack * moved process these first and note that it moved. 4) Process any * sack blocks. 5) Drop any acked from the queue. 6) Check for any * revoked blocks and mark. 7) Update the cwnd. 8) Nothing left, * sync up flightsizes and things, stop all timers and also check * for shutdown_pending state. If so then go ahead and send off the * shutdown. If in shutdown recv, send off the shutdown-ack and * start that timer, Ret. 9) Strike any non-acked things and do FR * procedure if needed being sure to set the FR flag. 10) Do pr-sctp * procedures. 11) Apply any FR penalties. 12) Assure we will SACK * if in shutdown_recv state. */ SCTP_TCB_LOCK_ASSERT(stcb); sack = &ch->sack; /* CMT DAC algo */ this_sack_lowest_newack = 0; j = 0; sack_length = (unsigned int)sack_len; /* ECN Nonce */ SCTP_STAT_INCR(sctps_slowpath_sack); nonce_sum_flag = ch->ch.chunk_flags & SCTP_SACK_NONCE_SUM; cum_ack = last_tsn = ntohl(sack->cum_tsn_ack); #ifdef SCTP_ASOCLOG_OF_TSNS stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cum_ack; stcb->asoc.cumack_log_at++; if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) { stcb->asoc.cumack_log_at = 0; } #endif num_seg = ntohs(sack->num_gap_ack_blks); a_rwnd = rwnd; if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_SACK_ARRIVALS_ENABLE) { sctp_misc_ints(SCTP_SACK_LOG_NORMAL, cum_ack, rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd); } /* CMT DAC algo */ cmt_dac_flag = ch->ch.chunk_flags & SCTP_SACK_CMT_DAC; num_dup = ntohs(sack->num_dup_tsns); old_rwnd = stcb->asoc.peers_rwnd; if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { sctp_misc_ints(SCTP_THRESHOLD_CLEAR, stcb->asoc.overall_error_count, 0, SCTP_FROM_SCTP_INDATA, __LINE__); } stcb->asoc.overall_error_count = 0; asoc = &stcb->asoc; if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { sctp_log_sack(asoc->last_acked_seq, cum_ack, 0, num_seg, num_dup, SCTP_LOG_NEW_SACK); } if ((num_dup) && (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_FR_LOGGING_ENABLE | SCTP_EARLYFR_LOGGING_ENABLE))) { int off_to_dup, iii; uint32_t *dupdata, dblock; off_to_dup = (num_seg * sizeof(struct sctp_gap_ack_block)) + sizeof(struct sctp_sack_chunk); if ((off_to_dup + (num_dup * sizeof(uint32_t))) <= sack_length) { dupdata = (uint32_t *) sctp_m_getptr(m, off_to_dup, sizeof(uint32_t), (uint8_t *) & dblock); off_to_dup += sizeof(uint32_t); if (dupdata) { for (iii = 0; iii < num_dup; iii++) { sctp_log_fr(*dupdata, 0, 0, SCTP_FR_DUPED); dupdata = (uint32_t *) sctp_m_getptr(m, off_to_dup, sizeof(uint32_t), (uint8_t *) & dblock); if (dupdata == NULL) break; off_to_dup += sizeof(uint32_t); } } } else { SCTP_PRINTF("Size invalid offset to dups:%d number dups:%d sack_len:%d num gaps:%d\n", off_to_dup, num_dup, sack_length, num_seg); } } if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) { /* reality check */ if (!TAILQ_EMPTY(&asoc->sent_queue)) { tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead); send_s = tp1->rec.data.TSN_seq + 1; } else { send_s = asoc->sending_seq; } if (cum_ack == send_s || compare_with_wrap(cum_ack, send_s, MAX_TSN)) { #ifndef INVARIANTS struct mbuf *oper; #endif #ifdef INVARIANTS hopeless_peer: panic("Impossible sack 1"); #else /* * no way, we have not even sent this TSN out yet. * Peer is hopelessly messed up with us. */ hopeless_peer: *abort_now = 1; /* XXX */ oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)), 0, M_DONTWAIT, 1, MT_DATA); if (oper) { struct sctp_paramhdr *ph; uint32_t *ippp; SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + sizeof(uint32_t); ph = mtod(oper, struct sctp_paramhdr *); ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); ph->param_length = htons(SCTP_BUF_LEN(oper)); ippp = (uint32_t *) (ph + 1); *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_25); } stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_25; sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); return; #endif } } /**********************/ /* 1) check the range */ /**********************/ if (compare_with_wrap(asoc->last_acked_seq, last_tsn, MAX_TSN)) { /* acking something behind */ return; } sav_cum_ack = asoc->last_acked_seq; /* update the Rwnd of the peer */ if (TAILQ_EMPTY(&asoc->sent_queue) && TAILQ_EMPTY(&asoc->send_queue) && (asoc->stream_queue_cnt == 0) ) { /* nothing left on send/sent and strmq */ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK, asoc->peers_rwnd, 0, 0, a_rwnd); } asoc->peers_rwnd = a_rwnd; if (asoc->sent_queue_retran_cnt) { asoc->sent_queue_retran_cnt = 0; } if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { /* SWS sender side engages */ asoc->peers_rwnd = 0; } /* stop any timers */ TAILQ_FOREACH(net, &asoc->nets, sctp_next) { sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_26); if (SCTP_BASE_SYSCTL(sctp_early_fr)) { if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) { SCTP_STAT_INCR(sctps_earlyfrstpidsck1); sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_26); } } net->partial_bytes_acked = 0; net->flight_size = 0; } asoc->total_flight = 0; asoc->total_flight_count = 0; return; } /* * We init netAckSz and netAckSz2 to 0. These are used to track 2 * things. The total byte count acked is tracked in netAckSz AND * netAck2 is used to track the total bytes acked that are un- * amibguious and were never retransmitted. We track these on a per * destination address basis. */ TAILQ_FOREACH(net, &asoc->nets, sctp_next) { net->prev_cwnd = net->cwnd; net->net_ack = 0; net->net_ack2 = 0; /* * CMT: Reset CUC and Fast recovery algo variables before * SACK processing */ net->new_pseudo_cumack = 0; net->will_exit_fast_recovery = 0; } /* process the new consecutive TSN first */ tp1 = TAILQ_FIRST(&asoc->sent_queue); while (tp1) { if (compare_with_wrap(last_tsn, tp1->rec.data.TSN_seq, MAX_TSN) || last_tsn == tp1->rec.data.TSN_seq) { if (tp1->sent != SCTP_DATAGRAM_UNSENT) { /* * ECN Nonce: Add the nonce to the sender's * nonce sum */ asoc->nonce_sum_expect_base += tp1->rec.data.ect_nonce; accum_moved = 1; if (tp1->sent < SCTP_DATAGRAM_ACKED) { /* * If it is less than ACKED, it is * now no-longer in flight. Higher * values may occur during marking */ if ((tp1->whoTo->dest_state & SCTP_ADDR_UNCONFIRMED) && (tp1->snd_count < 2)) { /* * If there was no retran * and the address is * un-confirmed and we sent * there and are now * sacked.. its confirmed, * mark it so. */ tp1->whoTo->dest_state &= ~SCTP_ADDR_UNCONFIRMED; } if (tp1->sent < SCTP_DATAGRAM_RESEND) { if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA, tp1->whoTo->flight_size, tp1->book_size, (uintptr_t) tp1->whoTo, tp1->rec.data.TSN_seq); } sctp_flight_size_decrease(tp1); sctp_total_flight_decrease(stcb, tp1); } tp1->whoTo->net_ack += tp1->send_size; /* CMT SFR and DAC algos */ this_sack_lowest_newack = tp1->rec.data.TSN_seq; tp1->whoTo->saw_newack = 1; if (tp1->snd_count < 2) { /* * True non-retransmited * chunk */ tp1->whoTo->net_ack2 += tp1->send_size; /* update RTO too? */ if (tp1->do_rtt) { tp1->whoTo->RTO = sctp_calculate_rto(stcb, asoc, tp1->whoTo, &tp1->sent_rcv_time, sctp_align_safe_nocopy); tp1->do_rtt = 0; } } /* * CMT: CUCv2 algorithm. From the * cumack'd TSNs, for each TSN being * acked for the first time, set the * following variables for the * corresp destination. * new_pseudo_cumack will trigger a * cwnd update. * find_(rtx_)pseudo_cumack will * trigger search for the next * expected (rtx-)pseudo-cumack. */ tp1->whoTo->new_pseudo_cumack = 1; tp1->whoTo->find_pseudo_cumack = 1; tp1->whoTo->find_rtx_pseudo_cumack = 1; if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { sctp_log_sack(asoc->last_acked_seq, cum_ack, tp1->rec.data.TSN_seq, 0, 0, SCTP_LOG_TSN_ACKED); } if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK); } } if (tp1->sent == SCTP_DATAGRAM_RESEND) { sctp_ucount_decr(asoc->sent_queue_retran_cnt); #ifdef SCTP_AUDITING_ENABLED sctp_audit_log(0xB3, (asoc->sent_queue_retran_cnt & 0x000000ff)); #endif } if (tp1->rec.data.chunk_was_revoked) { /* deflate the cwnd */ tp1->whoTo->cwnd -= tp1->book_size; tp1->rec.data.chunk_was_revoked = 0; } tp1->sent = SCTP_DATAGRAM_ACKED; } } else { break; } tp1 = TAILQ_NEXT(tp1, sctp_next); } biggest_tsn_newly_acked = biggest_tsn_acked = last_tsn; /* always set this up to cum-ack */ asoc->this_sack_highest_gap = last_tsn; /* Move offset up to point to gaps/dups */ offset += sizeof(struct sctp_sack_chunk); if (((num_seg * (sizeof(struct sctp_gap_ack_block))) + sizeof(struct sctp_sack_chunk)) > sack_length) { /* skip corrupt segments */ goto skip_segments; } if (num_seg > 0) { /* * CMT: SFR algo (and HTNA) - this_sack_highest_newack has * to be greater than the cumack. Also reset saw_newack to 0 * for all dests. */ TAILQ_FOREACH(net, &asoc->nets, sctp_next) { net->saw_newack = 0; net->this_sack_highest_newack = last_tsn; } /* * thisSackHighestGap will increase while handling NEW * segments this_sack_highest_newack will increase while * handling NEWLY ACKED chunks. this_sack_lowest_newack is * used for CMT DAC algo. saw_newack will also change. */ sctp_handle_segments(m, &offset, stcb, asoc, ch, last_tsn, &biggest_tsn_acked, &biggest_tsn_newly_acked, &this_sack_lowest_newack, num_seg, &ecn_seg_sums); if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) { /* * validate the biggest_tsn_acked in the gap acks if * strict adherence is wanted. */ if ((biggest_tsn_acked == send_s) || (compare_with_wrap(biggest_tsn_acked, send_s, MAX_TSN))) { /* * peer is either confused or we are under * attack. We must abort. */ goto hopeless_peer; } } } skip_segments: /*******************************************/ /* cancel ALL T3-send timer if accum moved */ /*******************************************/ if (SCTP_BASE_SYSCTL(sctp_cmt_on_off)) { TAILQ_FOREACH(net, &asoc->nets, sctp_next) { if (net->new_pseudo_cumack) sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_27); } } else { if (accum_moved) { TAILQ_FOREACH(net, &asoc->nets, sctp_next) { sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_28); } } } /********************************************/ /* drop the acked chunks from the sendqueue */ /********************************************/ asoc->last_acked_seq = cum_ack; tp1 = TAILQ_FIRST(&asoc->sent_queue); if (tp1 == NULL) goto done_with_it; do { if (compare_with_wrap(tp1->rec.data.TSN_seq, cum_ack, MAX_TSN)) { break; } if (tp1->sent == SCTP_DATAGRAM_UNSENT) { /* no more sent on list */ printf("Warning, tp1->sent == %d and its now acked?\n", tp1->sent); } tp2 = TAILQ_NEXT(tp1, sctp_next); TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next); if (tp1->pr_sctp_on) { if (asoc->pr_sctp_cnt != 0) asoc->pr_sctp_cnt--; } if ((TAILQ_FIRST(&asoc->sent_queue) == NULL) && (asoc->total_flight > 0)) { #ifdef INVARIANTS panic("Warning flight size is postive and should be 0"); #else SCTP_PRINTF("Warning flight size incorrect should be 0 is %d\n", asoc->total_flight); #endif asoc->total_flight = 0; } if (tp1->data) { /* sa_ignore NO_NULL_CHK */ sctp_free_bufspace(stcb, asoc, tp1, 1); sctp_m_freem(tp1->data); if (PR_SCTP_BUF_ENABLED(tp1->flags)) { asoc->sent_queue_cnt_removeable--; } } if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { sctp_log_sack(asoc->last_acked_seq, cum_ack, tp1->rec.data.TSN_seq, 0, 0, SCTP_LOG_FREE_SENT); } tp1->data = NULL; asoc->sent_queue_cnt--; sctp_free_a_chunk(stcb, tp1); wake_him++; tp1 = tp2; } while (tp1 != NULL); done_with_it: /* sa_ignore NO_NULL_CHK */ if ((wake_him) && (stcb->sctp_socket)) { #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) struct socket *so; #endif SOCKBUF_LOCK(&stcb->sctp_socket->so_snd); if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { sctp_wakeup_log(stcb, cum_ack, wake_him, SCTP_WAKESND_FROM_SACK); } #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) so = SCTP_INP_SO(stcb->sctp_ep); atomic_add_int(&stcb->asoc.refcnt, 1); SCTP_TCB_UNLOCK(stcb); SCTP_SOCKET_LOCK(so, 1); SCTP_TCB_LOCK(stcb); atomic_subtract_int(&stcb->asoc.refcnt, 1); if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { /* assoc was freed while we were unlocked */ SCTP_SOCKET_UNLOCK(so, 1); return; } #endif sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket); #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) SCTP_SOCKET_UNLOCK(so, 1); #endif } else { if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { sctp_wakeup_log(stcb, cum_ack, wake_him, SCTP_NOWAKE_FROM_SACK); } } if (asoc->fast_retran_loss_recovery && accum_moved) { if (compare_with_wrap(asoc->last_acked_seq, asoc->fast_recovery_tsn, MAX_TSN) || asoc->last_acked_seq == asoc->fast_recovery_tsn) { /* Setup so we will exit RFC2582 fast recovery */ will_exit_fast_recovery = 1; } } /* * Check for revoked fragments: * * if Previous sack - Had no frags then we can't have any revoked if * Previous sack - Had frag's then - If we now have frags aka * num_seg > 0 call sctp_check_for_revoked() to tell if peer revoked * some of them. else - The peer revoked all ACKED fragments, since * we had some before and now we have NONE. */ if (num_seg) sctp_check_for_revoked(stcb, asoc, cum_ack, biggest_tsn_acked); else if (asoc->saw_sack_with_frags) { int cnt_revoked = 0; tp1 = TAILQ_FIRST(&asoc->sent_queue); if (tp1 != NULL) { /* Peer revoked all dg's marked or acked */ TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { if ((tp1->sent > SCTP_DATAGRAM_RESEND) && (tp1->sent < SCTP_FORWARD_TSN_SKIP)) { tp1->sent = SCTP_DATAGRAM_SENT; if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE, tp1->whoTo->flight_size, tp1->book_size, (uintptr_t) tp1->whoTo, tp1->rec.data.TSN_seq); } sctp_flight_size_increase(tp1); sctp_total_flight_increase(stcb, tp1); tp1->rec.data.chunk_was_revoked = 1; /* * To ensure that this increase in * flightsize, which is artificial, * does not throttle the sender, we * also increase the cwnd * artificially. */ tp1->whoTo->cwnd += tp1->book_size; cnt_revoked++; } } if (cnt_revoked) { reneged_all = 1; } } asoc->saw_sack_with_frags = 0; } if (num_seg) asoc->saw_sack_with_frags = 1; else asoc->saw_sack_with_frags = 0; /* JRS - Use the congestion control given in the CC module */ asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, accum_moved, reneged_all, will_exit_fast_recovery); if (TAILQ_EMPTY(&asoc->sent_queue)) { /* nothing left in-flight */ TAILQ_FOREACH(net, &asoc->nets, sctp_next) { /* stop all timers */ if (SCTP_BASE_SYSCTL(sctp_early_fr)) { if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) { SCTP_STAT_INCR(sctps_earlyfrstpidsck4); sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_29); } } sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_30); net->flight_size = 0; net->partial_bytes_acked = 0; } asoc->total_flight = 0; asoc->total_flight_count = 0; } /**********************************/ /* Now what about shutdown issues */ /**********************************/ if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) { /* nothing left on sendqueue.. consider done */ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK, asoc->peers_rwnd, 0, 0, a_rwnd); } asoc->peers_rwnd = a_rwnd; if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { /* SWS sender side engages */ asoc->peers_rwnd = 0; } /* clean up */ if ((asoc->stream_queue_cnt == 1) && ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) || (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) && (asoc->locked_on_sending) ) { struct sctp_stream_queue_pending *sp; /* * I may be in a state where we got all across.. but * cannot write more due to a shutdown... we abort * since the user did not indicate EOR in this case. */ sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue), sctp_streamhead); if ((sp) && (sp->length == 0)) { asoc->locked_on_sending = NULL; if (sp->msg_is_complete) { asoc->stream_queue_cnt--; } else { asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT; asoc->stream_queue_cnt--; } } } if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) && (asoc->stream_queue_cnt == 0)) { if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { /* Need to abort here */ struct mbuf *oper; abort_out_now: *abort_now = 1; /* XXX */ oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)), 0, M_DONTWAIT, 1, MT_DATA); if (oper) { struct sctp_paramhdr *ph; uint32_t *ippp; SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + sizeof(uint32_t); ph = mtod(oper, struct sctp_paramhdr *); ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT); ph->param_length = htons(SCTP_BUF_LEN(oper)); ippp = (uint32_t *) (ph + 1); *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_31); } stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_31; sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_RESPONSE_TO_USER_REQ, oper, SCTP_SO_NOT_LOCKED); return; } else { if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { SCTP_STAT_DECR_GAUGE32(sctps_currestab); } SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT); SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); sctp_stop_timers_for_shutdown(stcb); sctp_send_shutdown(stcb, stcb->asoc.primary_destination); sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, asoc->primary_destination); sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb, asoc->primary_destination); } return; } else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) && (asoc->stream_queue_cnt == 0)) { if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { goto abort_out_now; } SCTP_STAT_DECR_GAUGE32(sctps_currestab); SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, asoc->primary_destination); return; } } /* * Now here we are going to recycle net_ack for a different use... * HEADS UP. */ TAILQ_FOREACH(net, &asoc->nets, sctp_next) { net->net_ack = 0; } /* * CMT DAC algorithm: If SACK DAC flag was 0, then no extra marking * to be done. Setting this_sack_lowest_newack to the cum_ack will * automatically ensure that. */ if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_use_dac) && (cmt_dac_flag == 0)) { this_sack_lowest_newack = cum_ack; } if (num_seg > 0) { sctp_strike_gap_ack_chunks(stcb, asoc, biggest_tsn_acked, biggest_tsn_newly_acked, this_sack_lowest_newack, accum_moved); } /*********************************************/ /* Here we perform PR-SCTP procedures */ /* (section 4.2) */ /*********************************************/ /* C1. update advancedPeerAckPoint */ if (compare_with_wrap(cum_ack, asoc->advanced_peer_ack_point, MAX_TSN)) { asoc->advanced_peer_ack_point = cum_ack; } /* JRS - Use the congestion control given in the CC module */ asoc->cc_functions.sctp_cwnd_update_after_fr(stcb, asoc); /****************************************************************** * Here we do the stuff with ECN Nonce checking. * We basically check to see if the nonce sum flag was incorrect * or if resynchronization needs to be done. Also if we catch a * misbehaving receiver we give him the kick. ******************************************************************/ if (asoc->ecn_nonce_allowed) { if (asoc->nonce_sum_check) { if (nonce_sum_flag != ((asoc->nonce_sum_expect_base + ecn_seg_sums) & SCTP_SACK_NONCE_SUM)) { if (asoc->nonce_wait_for_ecne == 0) { struct sctp_tmit_chunk *lchk; lchk = TAILQ_FIRST(&asoc->send_queue); asoc->nonce_wait_for_ecne = 1; if (lchk) { asoc->nonce_wait_tsn = lchk->rec.data.TSN_seq; } else { asoc->nonce_wait_tsn = asoc->sending_seq; } } else { if (compare_with_wrap(asoc->last_acked_seq, asoc->nonce_wait_tsn, MAX_TSN) || (asoc->last_acked_seq == asoc->nonce_wait_tsn)) { /* * Misbehaving peer. We need * to react to this guy */ asoc->ecn_allowed = 0; asoc->ecn_nonce_allowed = 0; } } } } else { /* See if Resynchronization Possible */ if (compare_with_wrap(asoc->last_acked_seq, asoc->nonce_resync_tsn, MAX_TSN)) { asoc->nonce_sum_check = 1; /* * now we must calculate what the base is. * We do this based on two things, we know * the total's for all the segments * gap-acked in the SACK, its stored in * ecn_seg_sums. We also know the SACK's * nonce sum, its in nonce_sum_flag. So we * can build a truth table to back-calculate * the new value of * asoc->nonce_sum_expect_base: * * SACK-flag-Value Seg-Sums Base 0 0 0 * 1 0 1 0 1 1 1 * 1 0 */ asoc->nonce_sum_expect_base = (ecn_seg_sums ^ nonce_sum_flag) & SCTP_SACK_NONCE_SUM; } } } /* Now are we exiting loss recovery ? */ if (will_exit_fast_recovery) { /* Ok, we must exit fast recovery */ asoc->fast_retran_loss_recovery = 0; } if ((asoc->sat_t3_loss_recovery) && ((compare_with_wrap(asoc->last_acked_seq, asoc->sat_t3_recovery_tsn, MAX_TSN) || (asoc->last_acked_seq == asoc->sat_t3_recovery_tsn)))) { /* end satellite t3 loss recovery */ asoc->sat_t3_loss_recovery = 0; } /* * CMT Fast recovery */ TAILQ_FOREACH(net, &asoc->nets, sctp_next) { if (net->will_exit_fast_recovery) { /* Ok, we must exit fast recovery */ net->fast_retran_loss_recovery = 0; } } /* Adjust and set the new rwnd value */ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK, asoc->peers_rwnd, asoc->total_flight, (asoc->sent_queue_cnt * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)), a_rwnd); } asoc->peers_rwnd = sctp_sbspace_sub(a_rwnd, (uint32_t) (asoc->total_flight + (asoc->sent_queue_cnt * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)))); if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { /* SWS sender side engages */ asoc->peers_rwnd = 0; } if (asoc->peers_rwnd > old_rwnd) { win_probe_recovery = 1; } /* * Now we must setup so we have a timer up for anyone with * outstanding data. */ done_once = 0; again: j = 0; TAILQ_FOREACH(net, &asoc->nets, sctp_next) { if (win_probe_recovery && (net->window_probe)) { net->window_probe = 0; win_probe_recovered = 1; /*- * Find first chunk that was used with * window probe and clear the event. Put * it back into the send queue as if has * not been sent. */ TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { if (tp1->window_probe) { sctp_window_probe_recovery(stcb, asoc, net, tp1); break; } } } if (net->flight_size) { j++; sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, net); } else { if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_22); } if (SCTP_BASE_SYSCTL(sctp_early_fr)) { if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) { SCTP_STAT_INCR(sctps_earlyfrstpidsck4); sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_23); } } } } if ((j == 0) && (!TAILQ_EMPTY(&asoc->sent_queue)) && (asoc->sent_queue_retran_cnt == 0) && (win_probe_recovered == 0) && (done_once == 0)) { /* huh, this should not happen */ sctp_fs_audit(asoc); TAILQ_FOREACH(net, &asoc->nets, sctp_next) { net->flight_size = 0; } asoc->total_flight = 0; asoc->total_flight_count = 0; asoc->sent_queue_retran_cnt = 0; TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { if (tp1->sent < SCTP_DATAGRAM_RESEND) { sctp_flight_size_increase(tp1); sctp_total_flight_increase(stcb, tp1); } else if (tp1->sent == SCTP_DATAGRAM_RESEND) { asoc->sent_queue_retran_cnt++; } } done_once = 1; goto again; } /* C2. try to further move advancedPeerAckPoint ahead */ if ((asoc->peer_supports_prsctp) && (asoc->pr_sctp_cnt > 0)) { struct sctp_tmit_chunk *lchk; uint32_t old_adv_peer_ack_point; old_adv_peer_ack_point = asoc->advanced_peer_ack_point; lchk = sctp_try_advance_peer_ack_point(stcb, asoc); /* C3. See if we need to send a Fwd-TSN */ if (compare_with_wrap(asoc->advanced_peer_ack_point, cum_ack, MAX_TSN)) { /* * ISSUE with ECN, see FWD-TSN processing for notes * on issues that will occur when the ECN NONCE * stuff is put into SCTP for cross checking. */ if (compare_with_wrap(asoc->advanced_peer_ack_point, old_adv_peer_ack_point, MAX_TSN)) { send_forward_tsn(stcb, asoc); /* * ECN Nonce: Disable Nonce Sum check when * FWD TSN is sent and store resync tsn */ asoc->nonce_sum_check = 0; asoc->nonce_resync_tsn = asoc->advanced_peer_ack_point; } } if (lchk) { /* Assure a timer is up */ sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, lchk->whoTo); } } if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_RWND_LOGGING_ENABLE) { sctp_misc_ints(SCTP_SACK_RWND_UPDATE, a_rwnd, stcb->asoc.peers_rwnd, stcb->asoc.total_flight, stcb->asoc.total_output_queue_size); } } void sctp_update_acked(struct sctp_tcb *stcb, struct sctp_shutdown_chunk *cp, struct sctp_nets *netp, int *abort_flag) { /* Copy cum-ack */ uint32_t cum_ack, a_rwnd; cum_ack = ntohl(cp->cumulative_tsn_ack); /* Arrange so a_rwnd does NOT change */ a_rwnd = stcb->asoc.peers_rwnd + stcb->asoc.total_flight; /* Now call the express sack handling */ sctp_express_handle_sack(stcb, cum_ack, a_rwnd, 0, abort_flag); } static void sctp_kick_prsctp_reorder_queue(struct sctp_tcb *stcb, struct sctp_stream_in *strmin) { struct sctp_queued_to_read *ctl, *nctl; struct sctp_association *asoc; int tt; /* EY -used to calculate nr_gap information */ uint32_t nr_tsn, nr_gap; asoc = &stcb->asoc; tt = strmin->last_sequence_delivered; /* * First deliver anything prior to and including the stream no that * came in */ ctl = TAILQ_FIRST(&strmin->inqueue); while (ctl) { nctl = TAILQ_NEXT(ctl, next); if (compare_with_wrap(tt, ctl->sinfo_ssn, MAX_SEQ) || (tt == ctl->sinfo_ssn)) { /* this is deliverable now */ TAILQ_REMOVE(&strmin->inqueue, ctl, next); /* subtract pending on streams */ asoc->size_on_all_streams -= ctl->length; sctp_ucount_decr(asoc->cnt_on_all_streams); /* deliver it to at least the delivery-q */ if (stcb->sctp_socket) { /* EY need the tsn info for calculating nr */ nr_tsn = ctl->sinfo_tsn; sctp_add_to_readq(stcb->sctp_ep, stcb, ctl, &stcb->sctp_socket->so_rcv, 1, SCTP_SO_NOT_LOCKED); /* * EY this is the chunk that should be * tagged nr gapped calculate the gap and * such then tag this TSN nr * chk->rec.data.TSN_seq */ if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) { if (nr_tsn >= asoc->nr_mapping_array_base_tsn) { nr_gap = nr_tsn - asoc->nr_mapping_array_base_tsn; } else { nr_gap = (MAX_TSN - asoc->nr_mapping_array_base_tsn) + nr_tsn + 1; } if ((nr_gap >= (SCTP_NR_MAPPING_ARRAY << 3)) || (nr_gap >= (uint32_t) (asoc->nr_mapping_array_size << 3))) { /* * EY These should never * happen- explained before */ } else { SCTP_TCB_LOCK_ASSERT(stcb); SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, nr_gap); if (nr_tsn > asoc->highest_tsn_inside_nr_map) asoc->highest_tsn_inside_nr_map = nr_tsn; } if (!SCTP_IS_TSN_PRESENT(asoc->mapping_array, nr_gap)) /* * printf("In * sctp_kick_prsctp_reorder_q * ueue(7): Something wrong, * the TSN to be tagged" * "\nas NR is not even in * the mapping_array, or map * and nr_map are * inconsistent"); */ /* * EY - not %100 sure about * the lock thing, don't * think its required */ /* * SCTP_TCB_LOCK_ASSERT(stcb) * ; */ { /* * printf("\nCalculating an * nr_gap!!\nmapping_array_si * ze = %d * nr_mapping_array_size = * %d" "\nmapping_array_base * = %d * nr_mapping_array_base = * %d\nhighest_tsn_inside_map * = %d" * "highest_tsn_inside_nr_map * = %d\nTSN = %d nr_gap = * %d",asoc->mapping_array_si * ze, * asoc->nr_mapping_array_siz * e, * asoc->mapping_array_base_t * sn, * asoc->nr_mapping_array_bas * e_tsn, * asoc->highest_tsn_inside_m * ap, * asoc->highest_tsn_inside_n * r_map,tsn,nr_gap); */ } } } } else { /* no more delivery now. */ break; } ctl = nctl; } /* * now we must deliver things in queue the normal way if any are * now ready. */ tt = strmin->last_sequence_delivered + 1; ctl = TAILQ_FIRST(&strmin->inqueue); while (ctl) { nctl = TAILQ_NEXT(ctl, next); if (tt == ctl->sinfo_ssn) { /* this is deliverable now */ TAILQ_REMOVE(&strmin->inqueue, ctl, next); /* subtract pending on streams */ asoc->size_on_all_streams -= ctl->length; sctp_ucount_decr(asoc->cnt_on_all_streams); /* deliver it to at least the delivery-q */ strmin->last_sequence_delivered = ctl->sinfo_ssn; if (stcb->sctp_socket) { /* EY */ nr_tsn = ctl->sinfo_tsn; sctp_add_to_readq(stcb->sctp_ep, stcb, ctl, &stcb->sctp_socket->so_rcv, 1, SCTP_SO_NOT_LOCKED); /* * EY this is the chunk that should be * tagged nr gapped calculate the gap and * such then tag this TSN nr * chk->rec.data.TSN_seq */ if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) { if (nr_tsn >= asoc->nr_mapping_array_base_tsn) { nr_gap = nr_tsn - asoc->nr_mapping_array_base_tsn; } else { nr_gap = (MAX_TSN - asoc->nr_mapping_array_base_tsn) + nr_tsn + 1; } if ((nr_gap >= (SCTP_NR_MAPPING_ARRAY << 3)) || (nr_gap >= (uint32_t) (asoc->nr_mapping_array_size << 3))) { /* * EY These should never * happen, explained before */ } else { SCTP_TCB_LOCK_ASSERT(stcb); SCTP_SET_TSN_PRESENT(asoc->nr_mapping_array, nr_gap); if (nr_tsn > asoc->highest_tsn_inside_nr_map) asoc->highest_tsn_inside_nr_map = nr_tsn; } if (!SCTP_IS_TSN_PRESENT(asoc->mapping_array, nr_gap)) /* * printf("In * sctp_kick_prsctp_reorder_q * ueue(8): Something wrong, * the TSN to be tagged" * "\nas NR is not even in * the mapping_array, or map * and nr_map are * inconsistent"); */ /* * EY - not %100 sure about * the lock thing, don't * think its required */ /* * SCTP_TCB_LOCK_ASSERT(stcb) * ; */ { /* * printf("\nCalculating an * nr_gap!!\nmapping_array_si * ze = %d * nr_mapping_array_size = * %d" "\nmapping_array_base * = %d * nr_mapping_array_base = * %d\nhighest_tsn_inside_map * = %d" * "highest_tsn_inside_nr_map * = %d\nTSN = %d nr_gap = * %d",asoc->mapping_array_si * ze, * asoc->nr_mapping_array_siz * e, * asoc->mapping_array_base_t * sn, * asoc->nr_mapping_array_bas * e_tsn, * asoc->highest_tsn_inside_m * ap, * asoc->highest_tsn_inside_n * r_map,tsn,nr_gap); */ } } } tt = strmin->last_sequence_delivered + 1; } else { break; } ctl = nctl; } } void sctp_handle_forward_tsn(struct sctp_tcb *stcb, struct sctp_forward_tsn_chunk *fwd, int *abort_flag, struct mbuf *m, int offset) { /* * ISSUES that MUST be fixed for ECN! When we are the sender of the * forward TSN, when the SACK comes back that acknowledges the * FWD-TSN we must reset the NONCE sum to match correctly. This will * get quite tricky since we may have sent more data interveneing * and must carefully account for what the SACK says on the nonce * and any gaps that are reported. This work will NOT be done here, * but I note it here since it is really related to PR-SCTP and * FWD-TSN's */ /* The pr-sctp fwd tsn */ /* * here we will perform all the data receiver side steps for * processing FwdTSN, as required in by pr-sctp draft: * * Assume we get FwdTSN(x): * * 1) update local cumTSN to x 2) try to further advance cumTSN to x + * others we have 3) examine and update re-ordering queue on * pr-in-streams 4) clean up re-assembly queue 5) Send a sack to * report where we are. */ struct sctp_association *asoc; uint32_t new_cum_tsn, gap; unsigned int i, cnt_gone, fwd_sz, cumack_set_flag, m_size; struct sctp_stream_in *strm; struct sctp_tmit_chunk *chk, *at; cumack_set_flag = 0; asoc = &stcb->asoc; cnt_gone = 0; if ((fwd_sz = ntohs(fwd->ch.chunk_length)) < sizeof(struct sctp_forward_tsn_chunk)) { SCTPDBG(SCTP_DEBUG_INDATA1, "Bad size too small/big fwd-tsn\n"); return; } m_size = (stcb->asoc.mapping_array_size << 3); /*************************************************************/ /* 1. Here we update local cumTSN and shift the bitmap array */ /*************************************************************/ new_cum_tsn = ntohl(fwd->new_cumulative_tsn); if (compare_with_wrap(asoc->cumulative_tsn, new_cum_tsn, MAX_TSN) || asoc->cumulative_tsn == new_cum_tsn) { /* Already got there ... */ return; } if (compare_with_wrap(new_cum_tsn, asoc->highest_tsn_inside_map, MAX_TSN)) { asoc->highest_tsn_inside_map = new_cum_tsn; /* EY nr_mapping_array version of the above */ /* * if(SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && * asoc->peer_supports_nr_sack) */ asoc->highest_tsn_inside_nr_map = new_cum_tsn; if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { sctp_log_map(0, 0, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); } } /* * now we know the new TSN is more advanced, let's find the actual * gap */ if ((compare_with_wrap(new_cum_tsn, asoc->mapping_array_base_tsn, MAX_TSN)) || (new_cum_tsn == asoc->mapping_array_base_tsn)) { gap = new_cum_tsn - asoc->mapping_array_base_tsn; } else { /* try to prevent underflow here */ gap = new_cum_tsn + (MAX_TSN - asoc->mapping_array_base_tsn) + 1; } if (gap >= m_size) { if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { sctp_log_map(0, 0, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); } if ((long)gap > sctp_sbspace(&stcb->asoc, &stcb->sctp_socket->so_rcv)) { struct mbuf *oper; /* * out of range (of single byte chunks in the rwnd I * give out). This must be an attacker. */ *abort_flag = 1; oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + 3 * sizeof(uint32_t)), 0, M_DONTWAIT, 1, MT_DATA); if (oper) { struct sctp_paramhdr *ph; uint32_t *ippp; SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + (sizeof(uint32_t) * 3); ph = mtod(oper, struct sctp_paramhdr *); ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); ph->param_length = htons(SCTP_BUF_LEN(oper)); ippp = (uint32_t *) (ph + 1); *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_33); ippp++; *ippp = asoc->highest_tsn_inside_map; ippp++; *ippp = new_cum_tsn; } stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_33; sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); return; } SCTP_STAT_INCR(sctps_fwdtsn_map_over); slide_out: memset(stcb->asoc.mapping_array, 0, stcb->asoc.mapping_array_size); cumack_set_flag = 1; asoc->mapping_array_base_tsn = new_cum_tsn + 1; asoc->cumulative_tsn = asoc->highest_tsn_inside_map = new_cum_tsn; /* EY - nr_sack: nr_mapping_array version of the above */ if (SCTP_BASE_SYSCTL(sctp_nr_sack_on_off) && asoc->peer_supports_nr_sack) { memset(stcb->asoc.nr_mapping_array, 0, stcb->asoc.nr_mapping_array_size); asoc->nr_mapping_array_base_tsn = new_cum_tsn + 1; asoc->highest_tsn_inside_nr_map = new_cum_tsn; if (asoc->nr_mapping_array_size != asoc->mapping_array_size) { /* * printf("IN sctp_handle_forward_tsn: * Something is wrong the size of" "map and * nr_map should be equal!") */ ; } } if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MAP_LOGGING_ENABLE) { sctp_log_map(0, 3, asoc->highest_tsn_inside_map, SCTP_MAP_SLIDE_RESULT); } asoc->last_echo_tsn = asoc->highest_tsn_inside_map; } else { SCTP_TCB_LOCK_ASSERT(stcb); if ((compare_with_wrap(((uint32_t) asoc->cumulative_tsn + gap), asoc->highest_tsn_inside_map, MAX_TSN)) || (((uint32_t) asoc->cumulative_tsn + gap) == asoc->highest_tsn_inside_map)) { goto slide_out; } else { for (i = 0; i <= gap; i++) { SCTP_SET_TSN_PRESENT(asoc->mapping_array, i); } } /* * Now after marking all, slide thing forward but no sack * please. */ sctp_sack_check(stcb, 0, 0, abort_flag); if (*abort_flag) return; } /*************************************************************/ /* 2. Clear up re-assembly queue */ /*************************************************************/ /* * First service it if pd-api is up, just in case we can progress it * forward */ if (asoc->fragmented_delivery_inprogress) { sctp_service_reassembly(stcb, asoc); } if (!TAILQ_EMPTY(&asoc->reasmqueue)) { /* For each one on here see if we need to toss it */ /* * For now large messages held on the reasmqueue that are * complete will be tossed too. We could in theory do more * work to spin through and stop after dumping one msg aka * seeing the start of a new msg at the head, and call the * delivery function... to see if it can be delivered... But * for now we just dump everything on the queue. */ chk = TAILQ_FIRST(&asoc->reasmqueue); while (chk) { at = TAILQ_NEXT(chk, sctp_next); if (compare_with_wrap(asoc->cumulative_tsn, chk->rec.data.TSN_seq, MAX_TSN) || asoc->cumulative_tsn == chk->rec.data.TSN_seq) { /* It needs to be tossed */ TAILQ_REMOVE(&asoc->reasmqueue, chk, sctp_next); if (compare_with_wrap(chk->rec.data.TSN_seq, asoc->tsn_last_delivered, MAX_TSN)) { asoc->tsn_last_delivered = chk->rec.data.TSN_seq; asoc->str_of_pdapi = chk->rec.data.stream_number; asoc->ssn_of_pdapi = chk->rec.data.stream_seq; asoc->fragment_flags = chk->rec.data.rcv_flags; } asoc->size_on_reasm_queue -= chk->send_size; sctp_ucount_decr(asoc->cnt_on_reasm_queue); cnt_gone++; /* Clear up any stream problem */ if ((chk->rec.data.rcv_flags & SCTP_DATA_UNORDERED) != SCTP_DATA_UNORDERED && (compare_with_wrap(chk->rec.data.stream_seq, asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered, MAX_SEQ))) { /* * We must dump forward this streams * sequence number if the chunk is * not unordered that is being * skipped. There is a chance that * if the peer does not include the * last fragment in its FWD-TSN we * WILL have a problem here since * you would have a partial chunk in * queue that may not be * deliverable. Also if a Partial * delivery API as started the user * may get a partial chunk. The next * read returning a new chunk... * really ugly but I see no way * around it! Maybe a notify?? */ asoc->strmin[chk->rec.data.stream_number].last_sequence_delivered = chk->rec.data.stream_seq; } if (chk->data) { sctp_m_freem(chk->data); chk->data = NULL; } sctp_free_a_chunk(stcb, chk); } else { /* * Ok we have gone beyond the end of the * fwd-tsn's mark. Some checks... */ if ((asoc->fragmented_delivery_inprogress) && (chk->rec.data.rcv_flags & SCTP_DATA_FIRST_FRAG)) { uint32_t str_seq; /* * Special case PD-API is up and * what we fwd-tsn' over includes * one that had the LAST_FRAG. We no * longer need to do the PD-API. */ asoc->fragmented_delivery_inprogress = 0; str_seq = (asoc->str_of_pdapi << 16) | asoc->ssn_of_pdapi; sctp_ulp_notify(SCTP_NOTIFY_PARTIAL_DELVIERY_INDICATION, stcb, SCTP_PARTIAL_DELIVERY_ABORTED, (void *)&str_seq, SCTP_SO_NOT_LOCKED); } break; } chk = at; } } if (asoc->fragmented_delivery_inprogress) { /* * Ok we removed cnt_gone chunks in the PD-API queue that * were being delivered. So now we must turn off the flag. */ uint32_t str_seq; str_seq = (asoc->str_of_pdapi << 16) | asoc->ssn_of_pdapi; sctp_ulp_notify(SCTP_NOTIFY_PARTIAL_DELVIERY_INDICATION, stcb, SCTP_PARTIAL_DELIVERY_ABORTED, (void *)&str_seq, SCTP_SO_NOT_LOCKED); asoc->fragmented_delivery_inprogress = 0; } /*************************************************************/ /* 3. Update the PR-stream re-ordering queues */ /*************************************************************/ fwd_sz -= sizeof(*fwd); if (m && fwd_sz) { /* New method. */ unsigned int num_str; struct sctp_strseq *stseq, strseqbuf; offset += sizeof(*fwd); num_str = fwd_sz / sizeof(struct sctp_strseq); for (i = 0; i < num_str; i++) { uint16_t st; stseq = (struct sctp_strseq *)sctp_m_getptr(m, offset, sizeof(struct sctp_strseq), (uint8_t *) & strseqbuf); offset += sizeof(struct sctp_strseq); if (stseq == NULL) { break; } /* Convert */ st = ntohs(stseq->stream); stseq->stream = st; st = ntohs(stseq->sequence); stseq->sequence = st; /* now process */ if (stseq->stream >= asoc->streamincnt) { /* screwed up streams, stop! */ break; } strm = &asoc->strmin[stseq->stream]; if (compare_with_wrap(stseq->sequence, strm->last_sequence_delivered, MAX_SEQ)) { /* Update the sequence number */ strm->last_sequence_delivered = stseq->sequence; } /* now kick the stream the new way */ /* sa_ignore NO_NULL_CHK */ sctp_kick_prsctp_reorder_queue(stcb, strm); } } if (TAILQ_FIRST(&asoc->reasmqueue)) { /* now lets kick out and check for more fragmented delivery */ /* sa_ignore NO_NULL_CHK */ sctp_deliver_reasm_check(stcb, &stcb->asoc); } } /* EY fully identical to sctp_express_handle_sack, duplicated for only naming convention */ void sctp_express_handle_nr_sack(struct sctp_tcb *stcb, uint32_t cumack, uint32_t rwnd, int nonce_sum_flag, int *abort_now) { struct sctp_nets *net; struct sctp_association *asoc; struct sctp_tmit_chunk *tp1, *tp2; uint32_t old_rwnd; int win_probe_recovery = 0; int win_probe_recovered = 0; int j, done_once = 0; if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_SACK_ARRIVALS_ENABLE) { sctp_misc_ints(SCTP_SACK_LOG_EXPRESS, cumack, rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd); } SCTP_TCB_LOCK_ASSERT(stcb); #ifdef SCTP_ASOCLOG_OF_TSNS stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cumack; stcb->asoc.cumack_log_at++; if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) { stcb->asoc.cumack_log_at = 0; } #endif asoc = &stcb->asoc; old_rwnd = asoc->peers_rwnd; if (compare_with_wrap(asoc->last_acked_seq, cumack, MAX_TSN)) { /* old ack */ return; } else if (asoc->last_acked_seq == cumack) { /* Window update sack */ asoc->peers_rwnd = sctp_sbspace_sub(rwnd, (uint32_t) (asoc->total_flight + (asoc->sent_queue_cnt * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)))); if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { /* SWS sender side engages */ asoc->peers_rwnd = 0; } if (asoc->peers_rwnd > old_rwnd) { goto again; } return; } /* First setup for CC stuff */ TAILQ_FOREACH(net, &asoc->nets, sctp_next) { net->prev_cwnd = net->cwnd; net->net_ack = 0; net->net_ack2 = 0; /* * CMT: Reset CUC and Fast recovery algo variables before * SACK processing */ net->new_pseudo_cumack = 0; net->will_exit_fast_recovery = 0; } if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) { uint32_t send_s; if (!TAILQ_EMPTY(&asoc->sent_queue)) { tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead); send_s = tp1->rec.data.TSN_seq + 1; } else { send_s = asoc->sending_seq; } if ((cumack == send_s) || compare_with_wrap(cumack, send_s, MAX_TSN)) { #ifndef INVARIANTS struct mbuf *oper; #endif #ifdef INVARIANTS panic("Impossible sack 1"); #else *abort_now = 1; /* XXX */ oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)), 0, M_DONTWAIT, 1, MT_DATA); if (oper) { struct sctp_paramhdr *ph; uint32_t *ippp; SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + sizeof(uint32_t); ph = mtod(oper, struct sctp_paramhdr *); ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); ph->param_length = htons(SCTP_BUF_LEN(oper)); ippp = (uint32_t *) (ph + 1); *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_25); } stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_25; sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); return; #endif } } asoc->this_sack_highest_gap = cumack; if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { sctp_misc_ints(SCTP_THRESHOLD_CLEAR, stcb->asoc.overall_error_count, 0, SCTP_FROM_SCTP_INDATA, __LINE__); } stcb->asoc.overall_error_count = 0; if (compare_with_wrap(cumack, asoc->last_acked_seq, MAX_TSN)) { /* process the new consecutive TSN first */ tp1 = TAILQ_FIRST(&asoc->sent_queue); while (tp1) { tp2 = TAILQ_NEXT(tp1, sctp_next); if (compare_with_wrap(cumack, tp1->rec.data.TSN_seq, MAX_TSN) || cumack == tp1->rec.data.TSN_seq) { if (tp1->sent == SCTP_DATAGRAM_UNSENT) { printf("Warning, an unsent is now acked?\n"); } /* * ECN Nonce: Add the nonce to the sender's * nonce sum */ asoc->nonce_sum_expect_base += tp1->rec.data.ect_nonce; if (tp1->sent < SCTP_DATAGRAM_ACKED) { /* * If it is less than ACKED, it is * now no-longer in flight. Higher * values may occur during marking */ if (tp1->sent < SCTP_DATAGRAM_RESEND) { if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA, tp1->whoTo->flight_size, tp1->book_size, (uintptr_t) tp1->whoTo, tp1->rec.data.TSN_seq); } sctp_flight_size_decrease(tp1); /* sa_ignore NO_NULL_CHK */ sctp_total_flight_decrease(stcb, tp1); } tp1->whoTo->net_ack += tp1->send_size; if (tp1->snd_count < 2) { /* * True non-retransmited * chunk */ tp1->whoTo->net_ack2 += tp1->send_size; /* update RTO too? */ if (tp1->do_rtt) { tp1->whoTo->RTO = /* * sa_ignore * NO_NULL_CHK */ sctp_calculate_rto(stcb, asoc, tp1->whoTo, &tp1->sent_rcv_time, sctp_align_safe_nocopy); tp1->do_rtt = 0; } } /* * CMT: CUCv2 algorithm. From the * cumack'd TSNs, for each TSN being * acked for the first time, set the * following variables for the * corresp destination. * new_pseudo_cumack will trigger a * cwnd update. * find_(rtx_)pseudo_cumack will * trigger search for the next * expected (rtx-)pseudo-cumack. */ tp1->whoTo->new_pseudo_cumack = 1; tp1->whoTo->find_pseudo_cumack = 1; tp1->whoTo->find_rtx_pseudo_cumack = 1; if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { /* sa_ignore NO_NULL_CHK */ sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK); } } if (tp1->sent == SCTP_DATAGRAM_RESEND) { sctp_ucount_decr(asoc->sent_queue_retran_cnt); } if (tp1->rec.data.chunk_was_revoked) { /* deflate the cwnd */ tp1->whoTo->cwnd -= tp1->book_size; tp1->rec.data.chunk_was_revoked = 0; } tp1->sent = SCTP_DATAGRAM_ACKED; TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next); if (tp1->data) { /* sa_ignore NO_NULL_CHK */ sctp_free_bufspace(stcb, asoc, tp1, 1); sctp_m_freem(tp1->data); } if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { sctp_log_sack(asoc->last_acked_seq, cumack, tp1->rec.data.TSN_seq, 0, 0, SCTP_LOG_FREE_SENT); } tp1->data = NULL; asoc->sent_queue_cnt--; sctp_free_a_chunk(stcb, tp1); tp1 = tp2; } else { break; } } } /* sa_ignore NO_NULL_CHK */ if (stcb->sctp_socket) { #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) struct socket *so; #endif SOCKBUF_LOCK(&stcb->sctp_socket->so_snd); if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { /* sa_ignore NO_NULL_CHK */ sctp_wakeup_log(stcb, cumack, 1, SCTP_WAKESND_FROM_SACK); } #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) so = SCTP_INP_SO(stcb->sctp_ep); atomic_add_int(&stcb->asoc.refcnt, 1); SCTP_TCB_UNLOCK(stcb); SCTP_SOCKET_LOCK(so, 1); SCTP_TCB_LOCK(stcb); atomic_subtract_int(&stcb->asoc.refcnt, 1); if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { /* assoc was freed while we were unlocked */ SCTP_SOCKET_UNLOCK(so, 1); return; } #endif sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket); #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) SCTP_SOCKET_UNLOCK(so, 1); #endif } else { if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { sctp_wakeup_log(stcb, cumack, 1, SCTP_NOWAKE_FROM_SACK); } } /* JRS - Use the congestion control given in the CC module */ if (asoc->last_acked_seq != cumack) asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, 1, 0, 0); asoc->last_acked_seq = cumack; if (TAILQ_EMPTY(&asoc->sent_queue)) { /* nothing left in-flight */ TAILQ_FOREACH(net, &asoc->nets, sctp_next) { net->flight_size = 0; net->partial_bytes_acked = 0; } asoc->total_flight = 0; asoc->total_flight_count = 0; } /* Fix up the a-p-a-p for future PR-SCTP sends */ if (compare_with_wrap(cumack, asoc->advanced_peer_ack_point, MAX_TSN)) { asoc->advanced_peer_ack_point = cumack; } /* ECN Nonce updates */ if (asoc->ecn_nonce_allowed) { if (asoc->nonce_sum_check) { if (nonce_sum_flag != ((asoc->nonce_sum_expect_base) & SCTP_SACK_NONCE_SUM)) { if (asoc->nonce_wait_for_ecne == 0) { struct sctp_tmit_chunk *lchk; lchk = TAILQ_FIRST(&asoc->send_queue); asoc->nonce_wait_for_ecne = 1; if (lchk) { asoc->nonce_wait_tsn = lchk->rec.data.TSN_seq; } else { asoc->nonce_wait_tsn = asoc->sending_seq; } } else { if (compare_with_wrap(asoc->last_acked_seq, asoc->nonce_wait_tsn, MAX_TSN) || (asoc->last_acked_seq == asoc->nonce_wait_tsn)) { /* * Misbehaving peer. We need * to react to this guy */ asoc->ecn_allowed = 0; asoc->ecn_nonce_allowed = 0; } } } } else { /* See if Resynchronization Possible */ if (compare_with_wrap(asoc->last_acked_seq, asoc->nonce_resync_tsn, MAX_TSN)) { asoc->nonce_sum_check = 1; /* * now we must calculate what the base is. * We do this based on two things, we know * the total's for all the segments * gap-acked in the SACK (none), We also * know the SACK's nonce sum, its in * nonce_sum_flag. So we can build a truth * table to back-calculate the new value of * asoc->nonce_sum_expect_base: * * SACK-flag-Value Seg-Sums Base 0 0 0 * 1 0 1 0 1 1 1 1 0 */ asoc->nonce_sum_expect_base = (0 ^ nonce_sum_flag) & SCTP_SACK_NONCE_SUM; } } } /* RWND update */ asoc->peers_rwnd = sctp_sbspace_sub(rwnd, (uint32_t) (asoc->total_flight + (asoc->sent_queue_cnt * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)))); if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { /* SWS sender side engages */ asoc->peers_rwnd = 0; } if (asoc->peers_rwnd > old_rwnd) { win_probe_recovery = 1; } /* Now assure a timer where data is queued at */ again: j = 0; TAILQ_FOREACH(net, &asoc->nets, sctp_next) { if (win_probe_recovery && (net->window_probe)) { net->window_probe = 0; win_probe_recovered = 1; /* * Find first chunk that was used with window probe * and clear the sent */ /* sa_ignore FREED_MEMORY */ TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { if (tp1->window_probe) { /* move back to data send queue */ sctp_window_probe_recovery(stcb, asoc, net, tp1); break; } } } if (net->flight_size) { int to_ticks; if (net->RTO == 0) { to_ticks = MSEC_TO_TICKS(stcb->asoc.initial_rto); } else { to_ticks = MSEC_TO_TICKS(net->RTO); } j++; (void)SCTP_OS_TIMER_START(&net->rxt_timer.timer, to_ticks, sctp_timeout_handler, &net->rxt_timer); } else { if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_22); } if (SCTP_BASE_SYSCTL(sctp_early_fr)) { if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) { SCTP_STAT_INCR(sctps_earlyfrstpidsck4); sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_23); } } } } if ((j == 0) && (!TAILQ_EMPTY(&asoc->sent_queue)) && (asoc->sent_queue_retran_cnt == 0) && (win_probe_recovered == 0) && (done_once == 0)) { /* huh, this should not happen */ sctp_fs_audit(asoc); TAILQ_FOREACH(net, &asoc->nets, sctp_next) { net->flight_size = 0; } asoc->total_flight = 0; asoc->total_flight_count = 0; asoc->sent_queue_retran_cnt = 0; TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { if (tp1->sent < SCTP_DATAGRAM_RESEND) { sctp_flight_size_increase(tp1); sctp_total_flight_increase(stcb, tp1); } else if (tp1->sent == SCTP_DATAGRAM_RESEND) { asoc->sent_queue_retran_cnt++; } } done_once = 1; goto again; } /**********************************/ /* Now what about shutdown issues */ /**********************************/ if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) { /* nothing left on sendqueue.. consider done */ /* clean up */ if ((asoc->stream_queue_cnt == 1) && ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) || (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) && (asoc->locked_on_sending) ) { struct sctp_stream_queue_pending *sp; /* * I may be in a state where we got all across.. but * cannot write more due to a shutdown... we abort * since the user did not indicate EOR in this case. * The sp will be cleaned during free of the asoc. */ sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue), sctp_streamhead); if ((sp) && (sp->length == 0)) { /* Let cleanup code purge it */ if (sp->msg_is_complete) { asoc->stream_queue_cnt--; } else { asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT; asoc->locked_on_sending = NULL; asoc->stream_queue_cnt--; } } } if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) && (asoc->stream_queue_cnt == 0)) { if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { /* Need to abort here */ struct mbuf *oper; abort_out_now: *abort_now = 1; /* XXX */ oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)), 0, M_DONTWAIT, 1, MT_DATA); if (oper) { struct sctp_paramhdr *ph; uint32_t *ippp; SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + sizeof(uint32_t); ph = mtod(oper, struct sctp_paramhdr *); ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT); ph->param_length = htons(SCTP_BUF_LEN(oper)); ippp = (uint32_t *) (ph + 1); *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_24); } stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_24; sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_RESPONSE_TO_USER_REQ, oper, SCTP_SO_NOT_LOCKED); } else { if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { SCTP_STAT_DECR_GAUGE32(sctps_currestab); } SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT); SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); sctp_stop_timers_for_shutdown(stcb); sctp_send_shutdown(stcb, stcb->asoc.primary_destination); sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, asoc->primary_destination); sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb, asoc->primary_destination); } } else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) && (asoc->stream_queue_cnt == 0)) { if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { goto abort_out_now; } SCTP_STAT_DECR_GAUGE32(sctps_currestab); SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, asoc->primary_destination); } } if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_RWND_LOGGING_ENABLE) { sctp_misc_ints(SCTP_SACK_RWND_UPDATE, rwnd, stcb->asoc.peers_rwnd, stcb->asoc.total_flight, stcb->asoc.total_output_queue_size); } } /* EY! nr_sack version of sctp_handle_segments, nr-gapped TSNs get removed from RtxQ in this method*/ static void sctp_handle_nr_sack_segments(struct mbuf *m, int *offset, struct sctp_tcb *stcb, struct sctp_association *asoc, struct sctp_nr_sack_chunk *ch, uint32_t last_tsn, uint32_t * biggest_tsn_acked, uint32_t * biggest_newly_acked_tsn, uint32_t * this_sack_lowest_newack, uint32_t num_seg, uint32_t num_nr_seg, int *ecn_seg_sums) { /************************************************/ /* process fragments and update sendqueue */ /************************************************/ struct sctp_nr_sack *nr_sack; struct sctp_gap_ack_block *frag, block; struct sctp_nr_gap_ack_block *nr_frag, nr_block; struct sctp_tmit_chunk *tp1; uint32_t i, j, all_bit; int wake_him = 0; uint32_t theTSN; int num_frs = 0; uint16_t frag_strt, frag_end, primary_flag_set; uint16_t nr_frag_strt, nr_frag_end; uint32_t last_frag_high; uint32_t last_nr_frag_high; all_bit = ch->ch.chunk_flags & SCTP_NR_SACK_ALL_BIT; /* * @@@ JRI : TODO: This flag is not used anywhere .. remove? */ if (asoc->primary_destination->dest_state & SCTP_ADDR_SWITCH_PRIMARY) { primary_flag_set = 1; } else { primary_flag_set = 0; } nr_sack = &ch->nr_sack; /* * EY! - I will process nr_gaps similarly,by going to this position * again if All bit is set */ frag = (struct sctp_gap_ack_block *)sctp_m_getptr(m, *offset, sizeof(struct sctp_gap_ack_block), (uint8_t *) & block); *offset += sizeof(block); if (frag == NULL) { return; } tp1 = NULL; last_frag_high = 0; for (i = 0; i < num_seg; i++) { frag_strt = ntohs(frag->start); frag_end = ntohs(frag->end); /* some sanity checks on the fargment offsets */ if (frag_strt > frag_end) { /* this one is malformed, skip */ frag++; continue; } if (compare_with_wrap((frag_end + last_tsn), *biggest_tsn_acked, MAX_TSN)) *biggest_tsn_acked = frag_end + last_tsn; /* mark acked dgs and find out the highestTSN being acked */ if (tp1 == NULL) { tp1 = TAILQ_FIRST(&asoc->sent_queue); /* save the locations of the last frags */ last_frag_high = frag_end + last_tsn; } else { /* * now lets see if we need to reset the queue due to * a out-of-order SACK fragment */ if (compare_with_wrap(frag_strt + last_tsn, last_frag_high, MAX_TSN)) { /* * if the new frag starts after the last TSN * frag covered, we are ok and this one is * beyond the last one */ ; } else { /* * ok, they have reset us, so we need to * reset the queue this will cause extra * hunting but hey, they chose the * performance hit when they failed to order * there gaps.. */ tp1 = TAILQ_FIRST(&asoc->sent_queue); } last_frag_high = frag_end + last_tsn; } for (j = frag_strt; j <= frag_end; j++) { theTSN = j + last_tsn; while (tp1) { if (tp1->rec.data.doing_fast_retransmit) num_frs++; /* * CMT: CUCv2 algorithm. For each TSN being * processed from the sent queue, track the * next expected pseudo-cumack, or * rtx_pseudo_cumack, if required. Separate * cumack trackers for first transmissions, * and retransmissions. */ if ((tp1->whoTo->find_pseudo_cumack == 1) && (tp1->sent < SCTP_DATAGRAM_RESEND) && (tp1->snd_count == 1)) { tp1->whoTo->pseudo_cumack = tp1->rec.data.TSN_seq; tp1->whoTo->find_pseudo_cumack = 0; } if ((tp1->whoTo->find_rtx_pseudo_cumack == 1) && (tp1->sent < SCTP_DATAGRAM_RESEND) && (tp1->snd_count > 1)) { tp1->whoTo->rtx_pseudo_cumack = tp1->rec.data.TSN_seq; tp1->whoTo->find_rtx_pseudo_cumack = 0; } if (tp1->rec.data.TSN_seq == theTSN) { if (tp1->sent != SCTP_DATAGRAM_UNSENT) { /* * must be held until * cum-ack passes */ /* * ECN Nonce: Add the nonce * value to the sender's * nonce sum */ if (tp1->sent < SCTP_DATAGRAM_RESEND) { /*- * If it is less than RESEND, it is * now no-longer in flight. * Higher values may already be set * via previous Gap Ack Blocks... * i.e. ACKED or RESEND. */ if (compare_with_wrap(tp1->rec.data.TSN_seq, *biggest_newly_acked_tsn, MAX_TSN)) { *biggest_newly_acked_tsn = tp1->rec.data.TSN_seq; } /* * CMT: SFR algo * (and HTNA) - set * saw_newack to 1 * for dest being * newly acked. * update * this_sack_highest_ * newack if * appropriate. */ if (tp1->rec.data.chunk_was_revoked == 0) tp1->whoTo->saw_newack = 1; if (compare_with_wrap(tp1->rec.data.TSN_seq, tp1->whoTo->this_sack_highest_newack, MAX_TSN)) { tp1->whoTo->this_sack_highest_newack = tp1->rec.data.TSN_seq; } /* * CMT DAC algo: * also update * this_sack_lowest_n * ewack */ if (*this_sack_lowest_newack == 0) { if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { sctp_log_sack(*this_sack_lowest_newack, last_tsn, tp1->rec.data.TSN_seq, 0, 0, SCTP_LOG_TSN_ACKED); } *this_sack_lowest_newack = tp1->rec.data.TSN_seq; } /* * CMT: CUCv2 * algorithm. If * (rtx-)pseudo-cumac * k for corresp * dest is being * acked, then we * have a new * (rtx-)pseudo-cumac * k. Set * new_(rtx_)pseudo_c * umack to TRUE so * that the cwnd for * this dest can be * updated. Also * trigger search * for the next * expected * (rtx-)pseudo-cumac * k. Separate * pseudo_cumack * trackers for * first * transmissions and * retransmissions. */ if (tp1->rec.data.TSN_seq == tp1->whoTo->pseudo_cumack) { if (tp1->rec.data.chunk_was_revoked == 0) { tp1->whoTo->new_pseudo_cumack = 1; } tp1->whoTo->find_pseudo_cumack = 1; } if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK); } if (tp1->rec.data.TSN_seq == tp1->whoTo->rtx_pseudo_cumack) { if (tp1->rec.data.chunk_was_revoked == 0) { tp1->whoTo->new_pseudo_cumack = 1; } tp1->whoTo->find_rtx_pseudo_cumack = 1; } if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { sctp_log_sack(*biggest_newly_acked_tsn, last_tsn, tp1->rec.data.TSN_seq, frag_strt, frag_end, SCTP_LOG_TSN_ACKED); } if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_GAP, tp1->whoTo->flight_size, tp1->book_size, (uintptr_t) tp1->whoTo, tp1->rec.data.TSN_seq); } sctp_flight_size_decrease(tp1); sctp_total_flight_decrease(stcb, tp1); tp1->whoTo->net_ack += tp1->send_size; if (tp1->snd_count < 2) { /* * True * non-retran * smited * chunk */ tp1->whoTo->net_ack2 += tp1->send_size; /* * update * RTO too ? */ if (tp1->do_rtt) { tp1->whoTo->RTO = sctp_calculate_rto(stcb, asoc, tp1->whoTo, &tp1->sent_rcv_time, sctp_align_safe_nocopy); tp1->do_rtt = 0; } } } if (tp1->sent <= SCTP_DATAGRAM_RESEND) { (*ecn_seg_sums) += tp1->rec.data.ect_nonce; (*ecn_seg_sums) &= SCTP_SACK_NONCE_SUM; if (compare_with_wrap(tp1->rec.data.TSN_seq, asoc->this_sack_highest_gap, MAX_TSN)) { asoc->this_sack_highest_gap = tp1->rec.data.TSN_seq; } if (tp1->sent == SCTP_DATAGRAM_RESEND) { sctp_ucount_decr(asoc->sent_queue_retran_cnt); #ifdef SCTP_AUDITING_ENABLED sctp_audit_log(0xB2, (asoc->sent_queue_retran_cnt & 0x000000ff)); #endif } } /* * All chunks NOT UNSENT * fall through here and are * marked */ tp1->sent = SCTP_DATAGRAM_MARKED; if (tp1->rec.data.chunk_was_revoked) { /* deflate the cwnd */ tp1->whoTo->cwnd -= tp1->book_size; tp1->rec.data.chunk_was_revoked = 0; } /* * EY - if all bit is set * then this TSN is * nr_marked */ if (all_bit) { tp1->sent = SCTP_DATAGRAM_NR_MARKED; /* * TAILQ_REMOVE(&asoc * ->sent_queue, * tp1, sctp_next); */ if (tp1->data) { /* * sa_ignore * NO_NULL_CH * K */ sctp_free_bufspace(stcb, asoc, tp1, 1); sctp_m_freem(tp1->data); } tp1->data = NULL; /* * asoc->sent_queue_c * nt--; */ /* * sctp_free_a_chunk( * stcb, tp1); */ wake_him++; } } break; } /* if (tp1->TSN_seq == theTSN) */ if (compare_with_wrap(tp1->rec.data.TSN_seq, theTSN, MAX_TSN)) break; tp1 = TAILQ_NEXT(tp1, sctp_next); } /* end while (tp1) */ } /* end for (j = fragStart */ frag = (struct sctp_gap_ack_block *)sctp_m_getptr(m, *offset, sizeof(struct sctp_gap_ack_block), (uint8_t *) & block); *offset += sizeof(block); if (frag == NULL) { break; } } if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FR_LOGGING_ENABLE) { if (num_frs) sctp_log_fr(*biggest_tsn_acked, *biggest_newly_acked_tsn, last_tsn, SCTP_FR_LOG_BIGGEST_TSNS); } /* * EY - if all bit is not set then there should be other loops to * identify nr TSNs */ if (!all_bit) { nr_frag = (struct sctp_nr_gap_ack_block *)sctp_m_getptr(m, *offset, sizeof(struct sctp_nr_gap_ack_block), (uint8_t *) & nr_block); *offset += sizeof(nr_block); if (nr_frag == NULL) { return; } tp1 = NULL; last_nr_frag_high = 0; for (i = 0; i < num_nr_seg; i++) { nr_frag_strt = ntohs(nr_frag->start); nr_frag_end = ntohs(nr_frag->end); /* some sanity checks on the nr fargment offsets */ if (nr_frag_strt > nr_frag_end) { /* this one is malformed, skip */ nr_frag++; continue; } /* * mark acked dgs and find out the highestTSN being * acked */ if (tp1 == NULL) { tp1 = TAILQ_FIRST(&asoc->sent_queue); /* save the locations of the last frags */ last_nr_frag_high = nr_frag_end + last_tsn; } else { /* * now lets see if we need to reset the * queue due to a out-of-order SACK fragment */ if (compare_with_wrap(nr_frag_strt + last_tsn, last_nr_frag_high, MAX_TSN)) { /* * if the new frag starts after the * last TSN frag covered, we are ok * and this one is beyond the last * one */ ; } else { /* * ok, they have reset us, so we * need to reset the queue this will * cause extra hunting but hey, they * chose the performance hit when * they failed to order there gaps.. */ tp1 = TAILQ_FIRST(&asoc->sent_queue); } last_nr_frag_high = nr_frag_end + last_tsn; } for (j = nr_frag_strt + last_tsn; (compare_with_wrap((nr_frag_end + last_tsn), j, MAX_TSN)); j++) { while (tp1) { if (tp1->rec.data.TSN_seq == j) { if (tp1->sent != SCTP_DATAGRAM_UNSENT) { tp1->sent = SCTP_DATAGRAM_NR_MARKED; /* * TAILQ_REMOVE(&asoc * ->sent_queue, * tp1, sctp_next); */ if (tp1->data) { /* * sa_ignore * NO_NULL_CH * K */ sctp_free_bufspace(stcb, asoc, tp1, 1); sctp_m_freem(tp1->data); } tp1->data = NULL; /* * asoc->sent_queue_c * nt--; */ /* * sctp_free_a_chunk( * stcb, tp1); */ wake_him++; } break; } /* if (tp1->TSN_seq == j) */ if (compare_with_wrap(tp1->rec.data.TSN_seq, j, MAX_TSN)) break; tp1 = TAILQ_NEXT(tp1, sctp_next); } /* end while (tp1) */ } /* end for (j = nrFragStart */ nr_frag = (struct sctp_nr_gap_ack_block *)sctp_m_getptr(m, *offset, sizeof(struct sctp_nr_gap_ack_block), (uint8_t *) & nr_block); *offset += sizeof(nr_block); if (nr_frag == NULL) { break; } } /* end of if(!all_bit) */ } /* * EY- wake up the socket if things have been removed from the sent * queue */ if ((wake_him) && (stcb->sctp_socket)) { #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) struct socket *so; #endif SOCKBUF_LOCK(&stcb->sctp_socket->so_snd); /* * if (SCTP_BASE_SYSCTL(sctp_logging_level) & * SCTP_WAKE_LOGGING_ENABLE) { sctp_wakeup_log(stcb, * cum_ack, wake_him, SCTP_WAKESND_FROM_SACK);} */ #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) so = SCTP_INP_SO(stcb->sctp_ep); atomic_add_int(&stcb->asoc.refcnt, 1); SCTP_TCB_UNLOCK(stcb); SCTP_SOCKET_LOCK(so, 1); SCTP_TCB_LOCK(stcb); atomic_subtract_int(&stcb->asoc.refcnt, 1); if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { /* assoc was freed while we were unlocked */ SCTP_SOCKET_UNLOCK(so, 1); return; } #endif sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket); #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) SCTP_SOCKET_UNLOCK(so, 1); #endif } /* else { if * (SCTP_BASE_SYSCTL(sctp_logging_level) & * SCTP_WAKE_LOGGING_ENABLE) { * sctp_wakeup_log(stcb, cum_ack, wake_him, * SCTP_NOWAKE_FROM_SACK); } } */ } /* EY- nr_sack */ /* Identifies the non-renegable tsns that are revoked*/ static void sctp_check_for_nr_revoked(struct sctp_tcb *stcb, struct sctp_association *asoc, uint32_t cumack, u_long biggest_tsn_acked) { struct sctp_tmit_chunk *tp1; tp1 = TAILQ_FIRST(&asoc->sent_queue); while (tp1) { if (compare_with_wrap(tp1->rec.data.TSN_seq, cumack, MAX_TSN)) { /* * ok this guy is either ACK or MARKED. If it is * ACKED it has been previously acked but not this * time i.e. revoked. If it is MARKED it was ACK'ed * again. */ if (compare_with_wrap(tp1->rec.data.TSN_seq, biggest_tsn_acked, MAX_TSN)) break; if (tp1->sent == SCTP_DATAGRAM_NR_ACKED) { /* * EY! a non-renegable TSN is revoked, need * to abort the association */ /* * EY TODO: put in the code to abort the * assoc. */ return; } else if (tp1->sent == SCTP_DATAGRAM_NR_MARKED) { /* it has been re-acked in this SACK */ tp1->sent = SCTP_DATAGRAM_NR_ACKED; } } if (tp1->sent == SCTP_DATAGRAM_UNSENT) break; tp1 = TAILQ_NEXT(tp1, sctp_next); } } /* EY! nr_sack version of sctp_handle_sack, nr_gap_ack processing should be added to this method*/ void sctp_handle_nr_sack(struct mbuf *m, int offset, struct sctp_nr_sack_chunk *ch, struct sctp_tcb *stcb, struct sctp_nets *net_from, int *abort_now, int nr_sack_len, uint32_t rwnd) { struct sctp_association *asoc; /* EY sack */ struct sctp_nr_sack *nr_sack; struct sctp_tmit_chunk *tp1, *tp2; uint32_t cum_ack, last_tsn, biggest_tsn_acked, biggest_tsn_newly_acked, this_sack_lowest_newack; uint32_t sav_cum_ack; /* EY num_seg */ uint16_t num_seg, num_nr_seg, num_dup; uint16_t wake_him = 0; unsigned int nr_sack_length; uint32_t send_s = 0; long j; int accum_moved = 0; int will_exit_fast_recovery = 0; uint32_t a_rwnd, old_rwnd; int win_probe_recovery = 0; int win_probe_recovered = 0; struct sctp_nets *net = NULL; int nonce_sum_flag, ecn_seg_sums = 0, all_bit; int done_once; uint8_t reneged_all = 0; uint8_t cmt_dac_flag; /* * we take any chance we can to service our queues since we cannot * get awoken when the socket is read from :< */ /* * Now perform the actual SACK handling: 1) Verify that it is not an * old sack, if so discard. 2) If there is nothing left in the send * queue (cum-ack is equal to last acked) then you have a duplicate * too, update any rwnd change and verify no timers are running. * then return. 3) Process any new consequtive data i.e. cum-ack * moved process these first and note that it moved. 4) Process any * sack blocks. 5) Drop any acked from the queue. 6) Check for any * revoked blocks and mark. 7) Update the cwnd. 8) Nothing left, * sync up flightsizes and things, stop all timers and also check * for shutdown_pending state. If so then go ahead and send off the * shutdown. If in shutdown recv, send off the shutdown-ack and * start that timer, Ret. 9) Strike any non-acked things and do FR * procedure if needed being sure to set the FR flag. 10) Do pr-sctp * procedures. 11) Apply any FR penalties. 12) Assure we will SACK * if in shutdown_recv state. */ SCTP_TCB_LOCK_ASSERT(stcb); nr_sack = &ch->nr_sack; /* CMT DAC algo */ this_sack_lowest_newack = 0; j = 0; nr_sack_length = (unsigned int)nr_sack_len; /* ECN Nonce */ SCTP_STAT_INCR(sctps_slowpath_sack); nonce_sum_flag = ch->ch.chunk_flags & SCTP_SACK_NONCE_SUM; cum_ack = last_tsn = ntohl(nr_sack->cum_tsn_ack); #ifdef SCTP_ASOCLOG_OF_TSNS stcb->asoc.cumack_log[stcb->asoc.cumack_log_at] = cum_ack; stcb->asoc.cumack_log_at++; if (stcb->asoc.cumack_log_at > SCTP_TSN_LOG_SIZE) { stcb->asoc.cumack_log_at = 0; } #endif all_bit = ch->ch.chunk_flags & SCTP_NR_SACK_ALL_BIT; num_seg = ntohs(nr_sack->num_gap_ack_blks); num_nr_seg = ntohs(nr_sack->num_nr_gap_ack_blks); if (all_bit) num_seg = num_nr_seg; a_rwnd = rwnd; if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_SACK_ARRIVALS_ENABLE) { sctp_misc_ints(SCTP_SACK_LOG_NORMAL, cum_ack, rwnd, stcb->asoc.last_acked_seq, stcb->asoc.peers_rwnd); } /* CMT DAC algo */ cmt_dac_flag = ch->ch.chunk_flags & SCTP_SACK_CMT_DAC; num_dup = ntohs(nr_sack->num_dup_tsns); old_rwnd = stcb->asoc.peers_rwnd; if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_THRESHOLD_LOGGING) { sctp_misc_ints(SCTP_THRESHOLD_CLEAR, stcb->asoc.overall_error_count, 0, SCTP_FROM_SCTP_INDATA, __LINE__); } stcb->asoc.overall_error_count = 0; asoc = &stcb->asoc; if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { sctp_log_sack(asoc->last_acked_seq, cum_ack, 0, num_seg, num_dup, SCTP_LOG_NEW_SACK); } if ((num_dup) && (SCTP_BASE_SYSCTL(sctp_logging_level) & (SCTP_FR_LOGGING_ENABLE | SCTP_EARLYFR_LOGGING_ENABLE))) { int off_to_dup, iii; uint32_t *dupdata, dblock; /* EY! gotta be careful here */ if (all_bit) { off_to_dup = (num_nr_seg * sizeof(struct sctp_nr_gap_ack_block)) + sizeof(struct sctp_nr_sack_chunk); } else { off_to_dup = (num_seg * sizeof(struct sctp_gap_ack_block)) + (num_nr_seg * sizeof(struct sctp_nr_gap_ack_block)) + sizeof(struct sctp_nr_sack_chunk); } if ((off_to_dup + (num_dup * sizeof(uint32_t))) <= nr_sack_length) { dupdata = (uint32_t *) sctp_m_getptr(m, off_to_dup, sizeof(uint32_t), (uint8_t *) & dblock); off_to_dup += sizeof(uint32_t); if (dupdata) { for (iii = 0; iii < num_dup; iii++) { sctp_log_fr(*dupdata, 0, 0, SCTP_FR_DUPED); dupdata = (uint32_t *) sctp_m_getptr(m, off_to_dup, sizeof(uint32_t), (uint8_t *) & dblock); if (dupdata == NULL) break; off_to_dup += sizeof(uint32_t); } } } else { SCTP_PRINTF("Size invalid offset to dups:%d number dups:%d nr_sack_len:%d num gaps:%d num nr_gaps:%d\n", off_to_dup, num_dup, nr_sack_length, num_seg, num_nr_seg); } } if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) { /* reality check */ if (!TAILQ_EMPTY(&asoc->sent_queue)) { tp1 = TAILQ_LAST(&asoc->sent_queue, sctpchunk_listhead); send_s = tp1->rec.data.TSN_seq + 1; } else { send_s = asoc->sending_seq; } if (cum_ack == send_s || compare_with_wrap(cum_ack, send_s, MAX_TSN)) { #ifndef INVARIANTS struct mbuf *oper; #endif #ifdef INVARIANTS hopeless_peer: panic("Impossible sack 1"); #else /* * no way, we have not even sent this TSN out yet. * Peer is hopelessly messed up with us. */ hopeless_peer: *abort_now = 1; /* XXX */ oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)), 0, M_DONTWAIT, 1, MT_DATA); if (oper) { struct sctp_paramhdr *ph; uint32_t *ippp; SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + sizeof(uint32_t); ph = mtod(oper, struct sctp_paramhdr *); ph->param_type = htons(SCTP_CAUSE_PROTOCOL_VIOLATION); ph->param_length = htons(SCTP_BUF_LEN(oper)); ippp = (uint32_t *) (ph + 1); *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_25); } stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_25; sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_PEER_FAULTY, oper, SCTP_SO_NOT_LOCKED); return; #endif } } /**********************/ /* 1) check the range */ /**********************/ if (compare_with_wrap(asoc->last_acked_seq, last_tsn, MAX_TSN)) { /* acking something behind */ return; } sav_cum_ack = asoc->last_acked_seq; /* update the Rwnd of the peer */ if (TAILQ_EMPTY(&asoc->sent_queue) && TAILQ_EMPTY(&asoc->send_queue) && (asoc->stream_queue_cnt == 0) ) { /* nothing left on send/sent and strmq */ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK, asoc->peers_rwnd, 0, 0, a_rwnd); } asoc->peers_rwnd = a_rwnd; if (asoc->sent_queue_retran_cnt) { asoc->sent_queue_retran_cnt = 0; } if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { /* SWS sender side engages */ asoc->peers_rwnd = 0; } /* stop any timers */ TAILQ_FOREACH(net, &asoc->nets, sctp_next) { sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_26); if (SCTP_BASE_SYSCTL(sctp_early_fr)) { if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) { SCTP_STAT_INCR(sctps_earlyfrstpidsck1); sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_26); } } net->partial_bytes_acked = 0; net->flight_size = 0; } asoc->total_flight = 0; asoc->total_flight_count = 0; return; } /* * We init netAckSz and netAckSz2 to 0. These are used to track 2 * things. The total byte count acked is tracked in netAckSz AND * netAck2 is used to track the total bytes acked that are un- * amibguious and were never retransmitted. We track these on a per * destination address basis. */ TAILQ_FOREACH(net, &asoc->nets, sctp_next) { net->prev_cwnd = net->cwnd; net->net_ack = 0; net->net_ack2 = 0; /* * CMT: Reset CUC and Fast recovery algo variables before * SACK processing */ net->new_pseudo_cumack = 0; net->will_exit_fast_recovery = 0; } /* process the new consecutive TSN first */ tp1 = TAILQ_FIRST(&asoc->sent_queue); while (tp1) { if (compare_with_wrap(last_tsn, tp1->rec.data.TSN_seq, MAX_TSN) || last_tsn == tp1->rec.data.TSN_seq) { if (tp1->sent != SCTP_DATAGRAM_UNSENT) { /* * ECN Nonce: Add the nonce to the sender's * nonce sum */ asoc->nonce_sum_expect_base += tp1->rec.data.ect_nonce; accum_moved = 1; if (tp1->sent < SCTP_DATAGRAM_ACKED) { /* * If it is less than ACKED, it is * now no-longer in flight. Higher * values may occur during marking */ if ((tp1->whoTo->dest_state & SCTP_ADDR_UNCONFIRMED) && (tp1->snd_count < 2)) { /* * If there was no retran * and the address is * un-confirmed and we sent * there and are now * sacked.. its confirmed, * mark it so. */ tp1->whoTo->dest_state &= ~SCTP_ADDR_UNCONFIRMED; } if (tp1->sent < SCTP_DATAGRAM_RESEND) { if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { sctp_misc_ints(SCTP_FLIGHT_LOG_DOWN_CA, tp1->whoTo->flight_size, tp1->book_size, (uintptr_t) tp1->whoTo, tp1->rec.data.TSN_seq); } sctp_flight_size_decrease(tp1); sctp_total_flight_decrease(stcb, tp1); } tp1->whoTo->net_ack += tp1->send_size; /* CMT SFR and DAC algos */ this_sack_lowest_newack = tp1->rec.data.TSN_seq; tp1->whoTo->saw_newack = 1; if (tp1->snd_count < 2) { /* * True non-retransmited * chunk */ tp1->whoTo->net_ack2 += tp1->send_size; /* update RTO too? */ if (tp1->do_rtt) { tp1->whoTo->RTO = sctp_calculate_rto(stcb, asoc, tp1->whoTo, &tp1->sent_rcv_time, sctp_align_safe_nocopy); tp1->do_rtt = 0; } } /* * CMT: CUCv2 algorithm. From the * cumack'd TSNs, for each TSN being * acked for the first time, set the * following variables for the * corresp destination. * new_pseudo_cumack will trigger a * cwnd update. * find_(rtx_)pseudo_cumack will * trigger search for the next * expected (rtx-)pseudo-cumack. */ tp1->whoTo->new_pseudo_cumack = 1; tp1->whoTo->find_pseudo_cumack = 1; tp1->whoTo->find_rtx_pseudo_cumack = 1; if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { sctp_log_sack(asoc->last_acked_seq, cum_ack, tp1->rec.data.TSN_seq, 0, 0, SCTP_LOG_TSN_ACKED); } if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_CWND_LOGGING_ENABLE) { sctp_log_cwnd(stcb, tp1->whoTo, tp1->rec.data.TSN_seq, SCTP_CWND_LOG_FROM_SACK); } } if (tp1->sent == SCTP_DATAGRAM_RESEND) { sctp_ucount_decr(asoc->sent_queue_retran_cnt); #ifdef SCTP_AUDITING_ENABLED sctp_audit_log(0xB3, (asoc->sent_queue_retran_cnt & 0x000000ff)); #endif } if (tp1->rec.data.chunk_was_revoked) { /* deflate the cwnd */ tp1->whoTo->cwnd -= tp1->book_size; tp1->rec.data.chunk_was_revoked = 0; } tp1->sent = SCTP_DATAGRAM_ACKED; } } else { break; } tp1 = TAILQ_NEXT(tp1, sctp_next); } biggest_tsn_newly_acked = biggest_tsn_acked = last_tsn; /* always set this up to cum-ack */ asoc->this_sack_highest_gap = last_tsn; /* Move offset up to point to gaps/dups */ offset += sizeof(struct sctp_nr_sack_chunk); if (((num_seg * (sizeof(struct sctp_gap_ack_block))) + sizeof(struct sctp_nr_sack_chunk)) > nr_sack_length) { /* skip corrupt segments */ goto skip_segments; } if (num_seg > 0) { /* * CMT: SFR algo (and HTNA) - this_sack_highest_newack has * to be greater than the cumack. Also reset saw_newack to 0 * for all dests. */ TAILQ_FOREACH(net, &asoc->nets, sctp_next) { net->saw_newack = 0; net->this_sack_highest_newack = last_tsn; } /* * thisSackHighestGap will increase while handling NEW * segments this_sack_highest_newack will increase while * handling NEWLY ACKED chunks. this_sack_lowest_newack is * used for CMT DAC algo. saw_newack will also change. */ sctp_handle_nr_sack_segments(m, &offset, stcb, asoc, ch, last_tsn, &biggest_tsn_acked, &biggest_tsn_newly_acked, &this_sack_lowest_newack, num_seg, num_nr_seg, &ecn_seg_sums); if (SCTP_BASE_SYSCTL(sctp_strict_sacks)) { /* * validate the biggest_tsn_acked in the gap acks if * strict adherence is wanted. */ if ((biggest_tsn_acked == send_s) || (compare_with_wrap(biggest_tsn_acked, send_s, MAX_TSN))) { /* * peer is either confused or we are under * attack. We must abort. */ goto hopeless_peer; } } } skip_segments: /*******************************************/ /* cancel ALL T3-send timer if accum moved */ /*******************************************/ if (SCTP_BASE_SYSCTL(sctp_cmt_on_off)) { TAILQ_FOREACH(net, &asoc->nets, sctp_next) { if (net->new_pseudo_cumack) sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_27); } } else { if (accum_moved) { TAILQ_FOREACH(net, &asoc->nets, sctp_next) { sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_28); } } } /********************************************/ /* drop the acked chunks from the sendqueue */ /********************************************/ asoc->last_acked_seq = cum_ack; tp1 = TAILQ_FIRST(&asoc->sent_queue); if (tp1 == NULL) goto done_with_it; do { if (compare_with_wrap(tp1->rec.data.TSN_seq, cum_ack, MAX_TSN)) { break; } if (tp1->sent == SCTP_DATAGRAM_UNSENT) { /* no more sent on list */ printf("Warning, tp1->sent == %d and its now acked?\n", tp1->sent); } tp2 = TAILQ_NEXT(tp1, sctp_next); TAILQ_REMOVE(&asoc->sent_queue, tp1, sctp_next); if (tp1->pr_sctp_on) { if (asoc->pr_sctp_cnt != 0) asoc->pr_sctp_cnt--; } if ((TAILQ_FIRST(&asoc->sent_queue) == NULL) && (asoc->total_flight > 0)) { #ifdef INVARIANTS panic("Warning flight size is postive and should be 0"); #else SCTP_PRINTF("Warning flight size incorrect should be 0 is %d\n", asoc->total_flight); #endif asoc->total_flight = 0; } if (tp1->data) { /* sa_ignore NO_NULL_CHK */ sctp_free_bufspace(stcb, asoc, tp1, 1); sctp_m_freem(tp1->data); if (PR_SCTP_BUF_ENABLED(tp1->flags)) { asoc->sent_queue_cnt_removeable--; } } if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_LOGGING_ENABLE) { sctp_log_sack(asoc->last_acked_seq, cum_ack, tp1->rec.data.TSN_seq, 0, 0, SCTP_LOG_FREE_SENT); } tp1->data = NULL; asoc->sent_queue_cnt--; sctp_free_a_chunk(stcb, tp1); wake_him++; tp1 = tp2; } while (tp1 != NULL); done_with_it: /* sa_ignore NO_NULL_CHK */ if ((wake_him) && (stcb->sctp_socket)) { #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) struct socket *so; #endif SOCKBUF_LOCK(&stcb->sctp_socket->so_snd); if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { sctp_wakeup_log(stcb, cum_ack, wake_him, SCTP_WAKESND_FROM_SACK); } #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) so = SCTP_INP_SO(stcb->sctp_ep); atomic_add_int(&stcb->asoc.refcnt, 1); SCTP_TCB_UNLOCK(stcb); SCTP_SOCKET_LOCK(so, 1); SCTP_TCB_LOCK(stcb); atomic_subtract_int(&stcb->asoc.refcnt, 1); if (stcb->asoc.state & SCTP_STATE_CLOSED_SOCKET) { /* assoc was freed while we were unlocked */ SCTP_SOCKET_UNLOCK(so, 1); return; } #endif sctp_sowwakeup_locked(stcb->sctp_ep, stcb->sctp_socket); #if defined (__APPLE__) || defined(SCTP_SO_LOCK_TESTING) SCTP_SOCKET_UNLOCK(so, 1); #endif } else { if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_WAKE_LOGGING_ENABLE) { sctp_wakeup_log(stcb, cum_ack, wake_him, SCTP_NOWAKE_FROM_SACK); } } if (asoc->fast_retran_loss_recovery && accum_moved) { if (compare_with_wrap(asoc->last_acked_seq, asoc->fast_recovery_tsn, MAX_TSN) || asoc->last_acked_seq == asoc->fast_recovery_tsn) { /* Setup so we will exit RFC2582 fast recovery */ will_exit_fast_recovery = 1; } } /* * Check for revoked fragments: * * if Previous sack - Had no frags then we can't have any revoked if * Previous sack - Had frag's then - If we now have frags aka * num_seg > 0 call sctp_check_for_revoked() to tell if peer revoked * some of them. else - The peer revoked all ACKED fragments, since * we had some before and now we have NONE. */ if (num_seg) sctp_check_for_revoked(stcb, asoc, cum_ack, biggest_tsn_acked); else if (asoc->saw_sack_with_frags) { int cnt_revoked = 0; tp1 = TAILQ_FIRST(&asoc->sent_queue); if (tp1 != NULL) { /* Peer revoked all dg's marked or acked */ TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { /* * EY- maybe check only if it is nr_acked * nr_marked may not be possible */ if ((tp1->sent == SCTP_DATAGRAM_NR_ACKED) || (tp1->sent == SCTP_DATAGRAM_NR_MARKED)) { /* * EY! - TODO: Something previously * nr_gapped is reneged, abort the * association */ return; } if ((tp1->sent > SCTP_DATAGRAM_RESEND) && (tp1->sent < SCTP_FORWARD_TSN_SKIP)) { tp1->sent = SCTP_DATAGRAM_SENT; if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_FLIGHT_LOGGING_ENABLE) { sctp_misc_ints(SCTP_FLIGHT_LOG_UP_REVOKE, tp1->whoTo->flight_size, tp1->book_size, (uintptr_t) tp1->whoTo, tp1->rec.data.TSN_seq); } sctp_flight_size_increase(tp1); sctp_total_flight_increase(stcb, tp1); tp1->rec.data.chunk_was_revoked = 1; /* * To ensure that this increase in * flightsize, which is artificial, * does not throttle the sender, we * also increase the cwnd * artificially. */ tp1->whoTo->cwnd += tp1->book_size; cnt_revoked++; } } if (cnt_revoked) { reneged_all = 1; } } asoc->saw_sack_with_frags = 0; } if (num_seg) asoc->saw_sack_with_frags = 1; else asoc->saw_sack_with_frags = 0; /* EY! - not sure about if there should be an IF */ if (num_nr_seg) sctp_check_for_nr_revoked(stcb, asoc, cum_ack, biggest_tsn_acked); else if (asoc->saw_sack_with_nr_frags) { /* * EY!- TODO: all previously nr_gapped chunks have been * reneged abort the association */ asoc->saw_sack_with_nr_frags = 0; } if (num_nr_seg) asoc->saw_sack_with_nr_frags = 1; else asoc->saw_sack_with_nr_frags = 0; /* JRS - Use the congestion control given in the CC module */ asoc->cc_functions.sctp_cwnd_update_after_sack(stcb, asoc, accum_moved, reneged_all, will_exit_fast_recovery); if (TAILQ_EMPTY(&asoc->sent_queue)) { /* nothing left in-flight */ TAILQ_FOREACH(net, &asoc->nets, sctp_next) { /* stop all timers */ if (SCTP_BASE_SYSCTL(sctp_early_fr)) { if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) { SCTP_STAT_INCR(sctps_earlyfrstpidsck4); sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_29); } } sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_30); net->flight_size = 0; net->partial_bytes_acked = 0; } asoc->total_flight = 0; asoc->total_flight_count = 0; } /**********************************/ /* Now what about shutdown issues */ /**********************************/ if (TAILQ_EMPTY(&asoc->send_queue) && TAILQ_EMPTY(&asoc->sent_queue)) { /* nothing left on sendqueue.. consider done */ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK, asoc->peers_rwnd, 0, 0, a_rwnd); } asoc->peers_rwnd = a_rwnd; if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { /* SWS sender side engages */ asoc->peers_rwnd = 0; } /* clean up */ if ((asoc->stream_queue_cnt == 1) && ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) || (asoc->state & SCTP_STATE_SHUTDOWN_RECEIVED)) && (asoc->locked_on_sending) ) { struct sctp_stream_queue_pending *sp; /* * I may be in a state where we got all across.. but * cannot write more due to a shutdown... we abort * since the user did not indicate EOR in this case. */ sp = TAILQ_LAST(&((asoc->locked_on_sending)->outqueue), sctp_streamhead); if ((sp) && (sp->length == 0)) { asoc->locked_on_sending = NULL; if (sp->msg_is_complete) { asoc->stream_queue_cnt--; } else { asoc->state |= SCTP_STATE_PARTIAL_MSG_LEFT; asoc->stream_queue_cnt--; } } } if ((asoc->state & SCTP_STATE_SHUTDOWN_PENDING) && (asoc->stream_queue_cnt == 0)) { if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { /* Need to abort here */ struct mbuf *oper; abort_out_now: *abort_now = 1; /* XXX */ oper = sctp_get_mbuf_for_msg((sizeof(struct sctp_paramhdr) + sizeof(uint32_t)), 0, M_DONTWAIT, 1, MT_DATA); if (oper) { struct sctp_paramhdr *ph; uint32_t *ippp; SCTP_BUF_LEN(oper) = sizeof(struct sctp_paramhdr) + sizeof(uint32_t); ph = mtod(oper, struct sctp_paramhdr *); ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT); ph->param_length = htons(SCTP_BUF_LEN(oper)); ippp = (uint32_t *) (ph + 1); *ippp = htonl(SCTP_FROM_SCTP_INDATA + SCTP_LOC_31); } stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_31; sctp_abort_an_association(stcb->sctp_ep, stcb, SCTP_RESPONSE_TO_USER_REQ, oper, SCTP_SO_NOT_LOCKED); return; } else { if ((SCTP_GET_STATE(asoc) == SCTP_STATE_OPEN) || (SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED)) { SCTP_STAT_DECR_GAUGE32(sctps_currestab); } SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_SENT); SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); sctp_stop_timers_for_shutdown(stcb); sctp_send_shutdown(stcb, stcb->asoc.primary_destination); sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWN, stcb->sctp_ep, stcb, asoc->primary_destination); sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNGUARD, stcb->sctp_ep, stcb, asoc->primary_destination); } return; } else if ((SCTP_GET_STATE(asoc) == SCTP_STATE_SHUTDOWN_RECEIVED) && (asoc->stream_queue_cnt == 0)) { if (asoc->state & SCTP_STATE_PARTIAL_MSG_LEFT) { goto abort_out_now; } SCTP_STAT_DECR_GAUGE32(sctps_currestab); SCTP_SET_STATE(asoc, SCTP_STATE_SHUTDOWN_ACK_SENT); SCTP_CLEAR_SUBSTATE(asoc, SCTP_STATE_SHUTDOWN_PENDING); sctp_send_shutdown_ack(stcb, stcb->asoc.primary_destination); sctp_timer_start(SCTP_TIMER_TYPE_SHUTDOWNACK, stcb->sctp_ep, stcb, asoc->primary_destination); return; } } /* * Now here we are going to recycle net_ack for a different use... * HEADS UP. */ TAILQ_FOREACH(net, &asoc->nets, sctp_next) { net->net_ack = 0; } /* * CMT DAC algorithm: If SACK DAC flag was 0, then no extra marking * to be done. Setting this_sack_lowest_newack to the cum_ack will * automatically ensure that. */ if (SCTP_BASE_SYSCTL(sctp_cmt_on_off) && SCTP_BASE_SYSCTL(sctp_cmt_use_dac) && (cmt_dac_flag == 0)) { this_sack_lowest_newack = cum_ack; } if (num_seg > 0) { sctp_strike_gap_ack_chunks(stcb, asoc, biggest_tsn_acked, biggest_tsn_newly_acked, this_sack_lowest_newack, accum_moved); } /* JRS - Use the congestion control given in the CC module */ asoc->cc_functions.sctp_cwnd_update_after_fr(stcb, asoc); /****************************************************************** * Here we do the stuff with ECN Nonce checking. * We basically check to see if the nonce sum flag was incorrect * or if resynchronization needs to be done. Also if we catch a * misbehaving receiver we give him the kick. ******************************************************************/ if (asoc->ecn_nonce_allowed) { if (asoc->nonce_sum_check) { if (nonce_sum_flag != ((asoc->nonce_sum_expect_base + ecn_seg_sums) & SCTP_SACK_NONCE_SUM)) { if (asoc->nonce_wait_for_ecne == 0) { struct sctp_tmit_chunk *lchk; lchk = TAILQ_FIRST(&asoc->send_queue); asoc->nonce_wait_for_ecne = 1; if (lchk) { asoc->nonce_wait_tsn = lchk->rec.data.TSN_seq; } else { asoc->nonce_wait_tsn = asoc->sending_seq; } } else { if (compare_with_wrap(asoc->last_acked_seq, asoc->nonce_wait_tsn, MAX_TSN) || (asoc->last_acked_seq == asoc->nonce_wait_tsn)) { /* * Misbehaving peer. We need * to react to this guy */ asoc->ecn_allowed = 0; asoc->ecn_nonce_allowed = 0; } } } } else { /* See if Resynchronization Possible */ if (compare_with_wrap(asoc->last_acked_seq, asoc->nonce_resync_tsn, MAX_TSN)) { asoc->nonce_sum_check = 1; /* * now we must calculate what the base is. * We do this based on two things, we know * the total's for all the segments * gap-acked in the SACK, its stored in * ecn_seg_sums. We also know the SACK's * nonce sum, its in nonce_sum_flag. So we * can build a truth table to back-calculate * the new value of * asoc->nonce_sum_expect_base: * * SACK-flag-Value Seg-Sums Base 0 0 0 * 1 0 1 0 1 1 1 1 0 */ asoc->nonce_sum_expect_base = (ecn_seg_sums ^ nonce_sum_flag) & SCTP_SACK_NONCE_SUM; } } } /* Now are we exiting loss recovery ? */ if (will_exit_fast_recovery) { /* Ok, we must exit fast recovery */ asoc->fast_retran_loss_recovery = 0; } if ((asoc->sat_t3_loss_recovery) && ((compare_with_wrap(asoc->last_acked_seq, asoc->sat_t3_recovery_tsn, MAX_TSN) || (asoc->last_acked_seq == asoc->sat_t3_recovery_tsn)))) { /* end satellite t3 loss recovery */ asoc->sat_t3_loss_recovery = 0; } /* * CMT Fast recovery */ TAILQ_FOREACH(net, &asoc->nets, sctp_next) { if (net->will_exit_fast_recovery) { /* Ok, we must exit fast recovery */ net->fast_retran_loss_recovery = 0; } } /* Adjust and set the new rwnd value */ if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOG_RWND_ENABLE) { sctp_log_rwnd_set(SCTP_SET_PEER_RWND_VIA_SACK, asoc->peers_rwnd, asoc->total_flight, (asoc->sent_queue_cnt * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)), a_rwnd); } asoc->peers_rwnd = sctp_sbspace_sub(a_rwnd, (uint32_t) (asoc->total_flight + (asoc->sent_queue_cnt * SCTP_BASE_SYSCTL(sctp_peer_chunk_oh)))); if (asoc->peers_rwnd < stcb->sctp_ep->sctp_ep.sctp_sws_sender) { /* SWS sender side engages */ asoc->peers_rwnd = 0; } if (asoc->peers_rwnd > old_rwnd) { win_probe_recovery = 1; } /* * Now we must setup so we have a timer up for anyone with * outstanding data. */ done_once = 0; again: j = 0; TAILQ_FOREACH(net, &asoc->nets, sctp_next) { if (win_probe_recovery && (net->window_probe)) { net->window_probe = 0; win_probe_recovered = 1; /*- * Find first chunk that was used with * window probe and clear the event. Put * it back into the send queue as if has * not been sent. */ TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { if (tp1->window_probe) { sctp_window_probe_recovery(stcb, asoc, net, tp1); break; } } } if (net->flight_size) { j++; sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, net); } else { if (SCTP_OS_TIMER_PENDING(&net->rxt_timer.timer)) { sctp_timer_stop(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_22); } if (SCTP_BASE_SYSCTL(sctp_early_fr)) { if (SCTP_OS_TIMER_PENDING(&net->fr_timer.timer)) { SCTP_STAT_INCR(sctps_earlyfrstpidsck4); sctp_timer_stop(SCTP_TIMER_TYPE_EARLYFR, stcb->sctp_ep, stcb, net, SCTP_FROM_SCTP_INDATA + SCTP_LOC_23); } } } } if ((j == 0) && (!TAILQ_EMPTY(&asoc->sent_queue)) && (asoc->sent_queue_retran_cnt == 0) && (win_probe_recovered == 0) && (done_once == 0)) { /* huh, this should not happen */ sctp_fs_audit(asoc); TAILQ_FOREACH(net, &asoc->nets, sctp_next) { net->flight_size = 0; } asoc->total_flight = 0; asoc->total_flight_count = 0; asoc->sent_queue_retran_cnt = 0; TAILQ_FOREACH(tp1, &asoc->sent_queue, sctp_next) { if (tp1->sent < SCTP_DATAGRAM_RESEND) { sctp_flight_size_increase(tp1); sctp_total_flight_increase(stcb, tp1); } else if (tp1->sent == SCTP_DATAGRAM_RESEND) { asoc->sent_queue_retran_cnt++; } } done_once = 1; goto again; } /*********************************************/ /* Here we perform PR-SCTP procedures */ /* (section 4.2) */ /*********************************************/ /* C1. update advancedPeerAckPoint */ if (compare_with_wrap(cum_ack, asoc->advanced_peer_ack_point, MAX_TSN)) { asoc->advanced_peer_ack_point = cum_ack; } /* C2. try to further move advancedPeerAckPoint ahead */ if ((asoc->peer_supports_prsctp) && (asoc->pr_sctp_cnt > 0)) { struct sctp_tmit_chunk *lchk; uint32_t old_adv_peer_ack_point; old_adv_peer_ack_point = asoc->advanced_peer_ack_point; lchk = sctp_try_advance_peer_ack_point(stcb, asoc); /* C3. See if we need to send a Fwd-TSN */ if (compare_with_wrap(asoc->advanced_peer_ack_point, cum_ack, MAX_TSN)) { /* * ISSUE with ECN, see FWD-TSN processing for notes * on issues that will occur when the ECN NONCE * stuff is put into SCTP for cross checking. */ if (compare_with_wrap(asoc->advanced_peer_ack_point, old_adv_peer_ack_point, MAX_TSN)) { send_forward_tsn(stcb, asoc); /* * ECN Nonce: Disable Nonce Sum check when * FWD TSN is sent and store resync tsn */ asoc->nonce_sum_check = 0; asoc->nonce_resync_tsn = asoc->advanced_peer_ack_point; } } if (lchk) { /* Assure a timer is up */ sctp_timer_start(SCTP_TIMER_TYPE_SEND, stcb->sctp_ep, stcb, lchk->whoTo); } } if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_SACK_RWND_LOGGING_ENABLE) { sctp_misc_ints(SCTP_SACK_RWND_UPDATE, a_rwnd, stcb->asoc.peers_rwnd, stcb->asoc.total_flight, stcb->asoc.total_output_queue_size); } }