2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
5 * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
6 * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
11 * a) Redistributions of source code must retain the above copyright notice,
12 * this list of conditions and the following disclaimer.
14 * b) Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the distribution.
18 * c) Neither the name of Cisco Systems, Inc. nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
38 #include <netinet/sctp_os.h>
39 #include <netinet/sctp_pcb.h>
40 #include <netinet/sctputil.h>
41 #include <netinet/sctp_var.h>
42 #include <netinet/sctp_var.h>
43 #include <netinet/sctp_sysctl.h>
44 #include <netinet/sctp.h>
45 #include <netinet/sctp_uio.h>
46 #include <netinet/sctp_peeloff.h>
47 #include <netinet/sctputil.h>
48 #include <netinet/sctp_auth.h>
52 sctp_can_peel_off(struct socket *head, sctp_assoc_t assoc_id)
54 struct sctp_inpcb *inp;
55 struct sctp_tcb *stcb;
59 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EBADF);
62 inp = (struct sctp_inpcb *)head->so_pcb;
64 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT);
67 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
68 (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
69 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EOPNOTSUPP);
72 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1);
74 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOENT);
77 state = SCTP_GET_STATE(stcb);
78 if ((state == SCTP_STATE_EMPTY) ||
79 (state == SCTP_STATE_INUSE)) {
80 SCTP_TCB_UNLOCK(stcb);
81 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
84 SCTP_TCB_UNLOCK(stcb);
85 /* We are clear to peel this one off */
90 sctp_do_peeloff(struct socket *head, struct socket *so, sctp_assoc_t assoc_id)
92 struct sctp_inpcb *inp, *n_inp;
93 struct sctp_tcb *stcb;
96 inp = (struct sctp_inpcb *)head->so_pcb;
98 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT);
101 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1);
103 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
107 state = SCTP_GET_STATE(stcb);
108 if ((state == SCTP_STATE_EMPTY) ||
109 (state == SCTP_STATE_INUSE)) {
110 SCTP_TCB_UNLOCK(stcb);
111 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
115 n_inp = (struct sctp_inpcb *)so->so_pcb;
116 n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE |
117 SCTP_PCB_FLAGS_CONNECTED |
118 SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */
119 (SCTP_PCB_COPY_FLAGS & inp->sctp_flags));
120 n_inp->sctp_socket = so;
121 n_inp->sctp_features = inp->sctp_features;
122 n_inp->sctp_mobility_features = inp->sctp_mobility_features;
123 n_inp->sctp_frag_point = inp->sctp_frag_point;
124 n_inp->sctp_cmt_on_off = inp->sctp_cmt_on_off;
125 n_inp->ecn_supported = inp->ecn_supported;
126 n_inp->prsctp_supported = inp->prsctp_supported;
127 n_inp->auth_supported = inp->auth_supported;
128 n_inp->asconf_supported = inp->asconf_supported;
129 n_inp->reconfig_supported = inp->reconfig_supported;
130 n_inp->nrsack_supported = inp->nrsack_supported;
131 n_inp->pktdrop_supported = inp->pktdrop_supported;
132 n_inp->partial_delivery_point = inp->partial_delivery_point;
133 n_inp->sctp_context = inp->sctp_context;
134 n_inp->max_cwnd = inp->max_cwnd;
135 n_inp->local_strreset_support = inp->local_strreset_support;
136 n_inp->inp_starting_point_for_iterator = NULL;
137 /* copy in the authentication parameters from the original endpoint */
138 if (n_inp->sctp_ep.local_hmacs)
139 sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs);
140 n_inp->sctp_ep.local_hmacs =
141 sctp_copy_hmaclist(inp->sctp_ep.local_hmacs);
142 if (n_inp->sctp_ep.local_auth_chunks)
143 sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks);
144 n_inp->sctp_ep.local_auth_chunks =
145 sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks);
146 (void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys,
147 &n_inp->sctp_ep.shared_keys);
149 * Now we must move it from one hash table to another and get the
150 * stcb in the right place.
152 sctp_move_pcb_and_assoc(inp, n_inp, stcb);
153 atomic_add_int(&stcb->asoc.refcnt, 1);
154 SCTP_TCB_UNLOCK(stcb);
156 sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT);
157 atomic_subtract_int(&stcb->asoc.refcnt, 1);