1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
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.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 *
11 * a) Redistributions of source code must retain the above copyright notice,
12 * this list of conditions and the following disclaimer.
13 *
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.
17 *
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.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
24 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
32 * THE POSSIBILITY OF SUCH DAMAGE.
33 */
34
35 #include <netinet/sctp_os.h>
36 #include <netinet/sctp_pcb.h>
37 #include <netinet/sctputil.h>
38 #include <netinet/sctp_var.h>
39 #include <netinet/sctp_var.h>
40 #include <netinet/sctp_sysctl.h>
41 #include <netinet/sctp.h>
42 #include <netinet/sctp_uio.h>
43 #include <netinet/sctp_peeloff.h>
44 #include <netinet/sctputil.h>
45 #include <netinet/sctp_auth.h>
46
47 int
sctp_can_peel_off(struct socket * head,sctp_assoc_t assoc_id)48 sctp_can_peel_off(struct socket *head, sctp_assoc_t assoc_id)
49 {
50 struct sctp_inpcb *inp;
51 struct sctp_tcb *stcb;
52 uint32_t state;
53
54 if (head == NULL) {
55 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EBADF);
56 return (EBADF);
57 }
58 inp = (struct sctp_inpcb *)head->so_pcb;
59 if (inp == NULL) {
60 SCTP_LTRACE_ERR_RET(NULL, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT);
61 return (EFAULT);
62 }
63 if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) ||
64 (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) {
65 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EOPNOTSUPP);
66 return (EOPNOTSUPP);
67 }
68 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1);
69 if (stcb == NULL) {
70 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOENT);
71 return (ENOENT);
72 }
73 state = SCTP_GET_STATE(stcb);
74 if ((state == SCTP_STATE_EMPTY) ||
75 (state == SCTP_STATE_INUSE)) {
76 SCTP_TCB_UNLOCK(stcb);
77 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
78 return (ENOTCONN);
79 }
80 SCTP_TCB_UNLOCK(stcb);
81 /* We are clear to peel this one off */
82 return (0);
83 }
84
85 int
sctp_do_peeloff(struct socket * head,struct socket * so,sctp_assoc_t assoc_id)86 sctp_do_peeloff(struct socket *head, struct socket *so, sctp_assoc_t assoc_id)
87 {
88 struct sctp_inpcb *inp, *n_inp;
89 struct sctp_tcb *stcb;
90 uint32_t state;
91
92 inp = (struct sctp_inpcb *)head->so_pcb;
93 if (inp == NULL) {
94 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT);
95 return (EFAULT);
96 }
97 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1);
98 if (stcb == NULL) {
99 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
100 return (ENOTCONN);
101 }
102
103 state = SCTP_GET_STATE(stcb);
104 if ((state == SCTP_STATE_EMPTY) ||
105 (state == SCTP_STATE_INUSE)) {
106 SCTP_TCB_UNLOCK(stcb);
107 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
108 return (ENOTCONN);
109 }
110
111 n_inp = (struct sctp_inpcb *)so->so_pcb;
112 n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE |
113 SCTP_PCB_FLAGS_CONNECTED |
114 SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */
115 (SCTP_PCB_COPY_FLAGS & inp->sctp_flags));
116 n_inp->sctp_socket = so;
117 n_inp->sctp_features = inp->sctp_features;
118 n_inp->sctp_mobility_features = inp->sctp_mobility_features;
119 n_inp->sctp_frag_point = inp->sctp_frag_point;
120 n_inp->sctp_cmt_on_off = inp->sctp_cmt_on_off;
121 n_inp->ecn_supported = inp->ecn_supported;
122 n_inp->prsctp_supported = inp->prsctp_supported;
123 n_inp->auth_supported = inp->auth_supported;
124 n_inp->asconf_supported = inp->asconf_supported;
125 n_inp->reconfig_supported = inp->reconfig_supported;
126 n_inp->nrsack_supported = inp->nrsack_supported;
127 n_inp->pktdrop_supported = inp->pktdrop_supported;
128 n_inp->partial_delivery_point = inp->partial_delivery_point;
129 n_inp->sctp_context = inp->sctp_context;
130 n_inp->max_cwnd = inp->max_cwnd;
131 n_inp->local_strreset_support = inp->local_strreset_support;
132 /* copy in the authentication parameters from the original endpoint */
133 if (n_inp->sctp_ep.local_hmacs)
134 sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs);
135 n_inp->sctp_ep.local_hmacs =
136 sctp_copy_hmaclist(inp->sctp_ep.local_hmacs);
137 if (n_inp->sctp_ep.local_auth_chunks)
138 sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks);
139 n_inp->sctp_ep.local_auth_chunks =
140 sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks);
141 (void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys,
142 &n_inp->sctp_ep.shared_keys);
143 /*
144 * Now we must move it from one hash table to another and get the
145 * stcb in the right place.
146 */
147 sctp_move_pcb_and_assoc(inp, n_inp, stcb);
148 atomic_add_int(&stcb->asoc.refcnt, 1);
149 SCTP_TCB_UNLOCK(stcb);
150
151 sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT);
152 atomic_subtract_int(&stcb->asoc.refcnt, 1);
153
154 return (0);
155 }
156