2 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
7 * a) Redistributions of source code must retain the above copyright notice,
8 * this list of conditions and the following disclaimer.
10 * b) Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the distribution.
14 * c) Neither the name of Cisco Systems, Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived
16 * from this software without specific prior written permission.
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
20 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
28 * THE POSSIBILITY OF SUCH DAMAGE.
32 /* $KAME: sctp_peeloff.c,v 1.13 2005/03/06 16:04:18 itojun Exp $ */
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
36 #include <netinet/sctp_os.h>
37 #include <netinet/sctp_pcb.h>
38 #include <netinet/sctputil.h>
39 #include <netinet/sctp_var.h>
40 #include <netinet/sctp_var.h>
41 #include <netinet/sctp_sysctl.h>
42 #include <netinet/sctp.h>
43 #include <netinet/sctp_uio.h>
44 #include <netinet/sctp_peeloff.h>
45 #include <netinet/sctputil.h>
46 #include <netinet/sctp_auth.h>
50 sctp_can_peel_off(struct socket *head, sctp_assoc_t assoc_id)
52 struct sctp_inpcb *inp;
53 struct sctp_tcb *stcb;
56 inp = (struct sctp_inpcb *)head->so_pcb;
58 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT);
61 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1);
63 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOENT);
66 state = SCTP_GET_STATE((&stcb->asoc));
67 if ((state == SCTP_STATE_EMPTY) ||
68 (state == SCTP_STATE_INUSE) ||
69 (state == SCTP_STATE_COOKIE_WAIT) ||
70 (state == SCTP_STATE_COOKIE_ECHOED)) {
71 SCTP_TCB_UNLOCK(stcb);
72 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
75 SCTP_TCB_UNLOCK(stcb);
76 /* We are clear to peel this one off */
81 sctp_do_peeloff(struct socket *head, struct socket *so, sctp_assoc_t assoc_id)
83 struct sctp_inpcb *inp, *n_inp;
84 struct sctp_tcb *stcb;
87 inp = (struct sctp_inpcb *)head->so_pcb;
89 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT);
92 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1);
94 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
97 state = SCTP_GET_STATE((&stcb->asoc));
98 if ((state == SCTP_STATE_EMPTY) ||
99 (state == SCTP_STATE_INUSE) ||
100 (state == SCTP_STATE_COOKIE_WAIT) ||
101 (state == SCTP_STATE_COOKIE_ECHOED)) {
102 SCTP_TCB_UNLOCK(stcb);
103 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
106 n_inp = (struct sctp_inpcb *)so->so_pcb;
107 n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE |
108 SCTP_PCB_FLAGS_CONNECTED |
109 SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */
110 (SCTP_PCB_COPY_FLAGS & inp->sctp_flags));
111 n_inp->sctp_socket = so;
112 n_inp->sctp_features = inp->sctp_features;
113 n_inp->sctp_mobility_features = inp->sctp_mobility_features;
114 n_inp->sctp_frag_point = inp->sctp_frag_point;
115 n_inp->sctp_cmt_on_off = inp->sctp_cmt_on_off;
116 n_inp->partial_delivery_point = inp->partial_delivery_point;
117 n_inp->sctp_context = inp->sctp_context;
118 n_inp->inp_starting_point_for_iterator = NULL;
119 /* copy in the authentication parameters from the original endpoint */
120 if (n_inp->sctp_ep.local_hmacs)
121 sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs);
122 n_inp->sctp_ep.local_hmacs =
123 sctp_copy_hmaclist(inp->sctp_ep.local_hmacs);
124 if (n_inp->sctp_ep.local_auth_chunks)
125 sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks);
126 n_inp->sctp_ep.local_auth_chunks =
127 sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks);
128 (void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys,
129 &n_inp->sctp_ep.shared_keys);
131 * Now we must move it from one hash table to another and get the
132 * stcb in the right place.
134 sctp_move_pcb_and_assoc(inp, n_inp, stcb);
135 atomic_add_int(&stcb->asoc.refcnt, 1);
136 SCTP_TCB_UNLOCK(stcb);
138 sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT);
139 atomic_subtract_int(&stcb->asoc.refcnt, 1);
146 sctp_get_peeloff(struct socket *head, sctp_assoc_t assoc_id, int *error)
148 struct socket *newso;
149 struct sctp_inpcb *inp, *n_inp;
150 struct sctp_tcb *stcb;
152 SCTPDBG(SCTP_DEBUG_PEEL1, "SCTP peel-off called\n");
153 inp = (struct sctp_inpcb *)head->so_pcb;
155 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT);
159 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1);
161 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
165 atomic_add_int(&stcb->asoc.refcnt, 1);
166 SCTP_TCB_UNLOCK(stcb);
167 newso = sonewconn(head, SS_ISCONNECTED
170 SCTPDBG(SCTP_DEBUG_PEEL1, "sctp_peeloff:sonewconn failed\n");
171 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOMEM);
173 atomic_subtract_int(&stcb->asoc.refcnt, 1);
178 atomic_subtract_int(&stcb->asoc.refcnt, 1);
179 n_inp = (struct sctp_inpcb *)newso->so_pcb;
181 n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE |
182 SCTP_PCB_FLAGS_CONNECTED |
183 SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */
184 (SCTP_PCB_COPY_FLAGS & inp->sctp_flags));
185 n_inp->sctp_features = inp->sctp_features;
186 n_inp->sctp_frag_point = inp->sctp_frag_point;
187 n_inp->sctp_cmt_on_off = inp->sctp_cmt_on_off;
188 n_inp->partial_delivery_point = inp->partial_delivery_point;
189 n_inp->sctp_context = inp->sctp_context;
190 n_inp->inp_starting_point_for_iterator = NULL;
192 /* copy in the authentication parameters from the original endpoint */
193 if (n_inp->sctp_ep.local_hmacs)
194 sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs);
195 n_inp->sctp_ep.local_hmacs =
196 sctp_copy_hmaclist(inp->sctp_ep.local_hmacs);
197 if (n_inp->sctp_ep.local_auth_chunks)
198 sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks);
199 n_inp->sctp_ep.local_auth_chunks =
200 sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks);
201 (void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys,
202 &n_inp->sctp_ep.shared_keys);
204 n_inp->sctp_socket = newso;
205 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
206 sctp_feature_off(n_inp, SCTP_PCB_FLAGS_AUTOCLOSE);
207 n_inp->sctp_ep.auto_close_time = 0;
208 sctp_timer_stop(SCTP_TIMER_TYPE_AUTOCLOSE, n_inp, stcb, NULL,
209 SCTP_FROM_SCTP_PEELOFF + SCTP_LOC_1);
211 /* Turn off any non-blocking semantic. */
212 SCTP_CLEAR_SO_NBIO(newso);
213 newso->so_state |= SS_ISCONNECTED;
214 /* We remove it right away */
216 #ifdef SCTP_LOCK_LOGGING
217 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOCK_LOGGING_ENABLE) {
218 sctp_log_lock(inp, (struct sctp_tcb *)NULL, SCTP_LOG_LOCK_SOCK);
221 TAILQ_REMOVE(&head->so_comp, newso, so_list);
225 * Now we must move it from one hash table to another and get the
226 * stcb in the right place.
228 sctp_move_pcb_and_assoc(inp, n_inp, stcb);
229 atomic_add_int(&stcb->asoc.refcnt, 1);
230 SCTP_TCB_UNLOCK(stcb);
232 * And now the final hack. We move data in the pending side i.e.
233 * head to the new socket buffer. Let the GRUBBING begin :-0
235 sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT);
236 atomic_subtract_int(&stcb->asoc.refcnt, 1);