1/*-
2 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 *
7 * a) Redistributions of source code must retain the above copyright notice,
8 * this list of conditions and the following disclaimer.
9 *
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.
13 *
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.
17 *
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.
29 */
30
31
32/* $KAME: sctp_peeloff.c,v 1.13 2005/03/06 16:04:18 itojun Exp $ */
33
34#include <sys/cdefs.h>
35__FBSDID("$FreeBSD: head/sys/netinet/sctp_peeloff.c 179783 2008-06-14 07:58:05Z rrs $");
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>
47
48
49int
50sctp_can_peel_off(struct socket *head, sctp_assoc_t assoc_id)
51{
52 struct sctp_inpcb *inp;
53 struct sctp_tcb *stcb;
54 uint32_t state;
55
56 inp = (struct sctp_inpcb *)head->so_pcb;
57 if (inp == NULL) {
58 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT);
59 return (EFAULT);
60 }
61 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1);
62 if (stcb == NULL) {
63 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOENT);
64 return (ENOENT);
65 }
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);
73 return (ENOTCONN);
74 }
75 SCTP_TCB_UNLOCK(stcb);
76 /* We are clear to peel this one off */
77 return (0);
78}
79
80int
81sctp_do_peeloff(struct socket *head, struct socket *so, sctp_assoc_t assoc_id)
82{
83 struct sctp_inpcb *inp, *n_inp;
84 struct sctp_tcb *stcb;
85 uint32_t state;
86
87 inp = (struct sctp_inpcb *)head->so_pcb;
88 if (inp == NULL) {
89 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT);
90 return (EFAULT);
91 }
92 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1);
93 if (stcb == NULL) {
94 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
95 return (ENOTCONN);
96 }
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);
104 return (ENOTCONN);
105 }
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->partial_delivery_point = inp->partial_delivery_point;
116 n_inp->sctp_context = inp->sctp_context;
117 n_inp->inp_starting_point_for_iterator = NULL;
118 /* copy in the authentication parameters from the original endpoint */
119 if (n_inp->sctp_ep.local_hmacs)
120 sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs);
121 n_inp->sctp_ep.local_hmacs =
122 sctp_copy_hmaclist(inp->sctp_ep.local_hmacs);
123 if (n_inp->sctp_ep.local_auth_chunks)
124 sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks);
125 n_inp->sctp_ep.local_auth_chunks =
126 sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks);
127 (void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys,
128 &n_inp->sctp_ep.shared_keys);
129 /*
130 * Now we must move it from one hash table to another and get the
131 * stcb in the right place.
132 */
133 sctp_move_pcb_and_assoc(inp, n_inp, stcb);
134 atomic_add_int(&stcb->asoc.refcnt, 1);
135 SCTP_TCB_UNLOCK(stcb);
136
137 sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT);
138 atomic_subtract_int(&stcb->asoc.refcnt, 1);
139
140 return (0);
141}
142
143
144struct socket *
145sctp_get_peeloff(struct socket *head, sctp_assoc_t assoc_id, int *error)
146{
147 struct socket *newso;
148 struct sctp_inpcb *inp, *n_inp;
149 struct sctp_tcb *stcb;
150
151 SCTPDBG(SCTP_DEBUG_PEEL1, "SCTP peel-off called\n");
152 inp = (struct sctp_inpcb *)head->so_pcb;
153 if (inp == NULL) {
154 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT);
155 *error = EFAULT;
156 return (NULL);
157 }
158 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1);
159 if (stcb == NULL) {
160 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN);
161 *error = ENOTCONN;
162 return (NULL);
163 }
164 atomic_add_int(&stcb->asoc.refcnt, 1);
165 SCTP_TCB_UNLOCK(stcb);
166 newso = sonewconn(head, SS_ISCONNECTED
167 );
168 if (newso == NULL) {
169 SCTPDBG(SCTP_DEBUG_PEEL1, "sctp_peeloff:sonewconn failed\n");
170 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOMEM);
171 *error = ENOMEM;
172 atomic_subtract_int(&stcb->asoc.refcnt, 1);
173 return (NULL);
174
175 }
176 SCTP_TCB_LOCK(stcb);
177 atomic_subtract_int(&stcb->asoc.refcnt, 1);
178 n_inp = (struct sctp_inpcb *)newso->so_pcb;
179 SOCK_LOCK(head);
180 n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE |
181 SCTP_PCB_FLAGS_CONNECTED |
182 SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */
183 (SCTP_PCB_COPY_FLAGS & inp->sctp_flags));
184 n_inp->sctp_features = inp->sctp_features;
185 n_inp->sctp_frag_point = inp->sctp_frag_point;
186 n_inp->partial_delivery_point = inp->partial_delivery_point;
187 n_inp->sctp_context = inp->sctp_context;
188 n_inp->inp_starting_point_for_iterator = NULL;
189
190 /* copy in the authentication parameters from the original endpoint */
191 if (n_inp->sctp_ep.local_hmacs)
192 sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs);
193 n_inp->sctp_ep.local_hmacs =
194 sctp_copy_hmaclist(inp->sctp_ep.local_hmacs);
195 if (n_inp->sctp_ep.local_auth_chunks)
196 sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks);
197 n_inp->sctp_ep.local_auth_chunks =
198 sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks);
199 (void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys,
200 &n_inp->sctp_ep.shared_keys);
201
202 n_inp->sctp_socket = newso;
203 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
204 sctp_feature_off(n_inp, SCTP_PCB_FLAGS_AUTOCLOSE);
205 n_inp->sctp_ep.auto_close_time = 0;
206 sctp_timer_stop(SCTP_TIMER_TYPE_AUTOCLOSE, n_inp, stcb, NULL,
207 SCTP_FROM_SCTP_PEELOFF + SCTP_LOC_1);
208 }
209 /* Turn off any non-blocking semantic. */
210 SCTP_CLEAR_SO_NBIO(newso);
211 newso->so_state |= SS_ISCONNECTED;
212 /* We remove it right away */
213
214#ifdef SCTP_LOCK_LOGGING
215 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOCK_LOGGING_ENABLE) {
216 sctp_log_lock(inp, (struct sctp_tcb *)NULL, SCTP_LOG_LOCK_SOCK);
217 }
218#endif
219 TAILQ_REMOVE(&head->so_comp, newso, so_list);
220 head->so_qlen--;
221 SOCK_UNLOCK(head);
222 /*
223 * Now we must move it from one hash table to another and get the
224 * stcb in the right place.
225 */
226 sctp_move_pcb_and_assoc(inp, n_inp, stcb);
227 atomic_add_int(&stcb->asoc.refcnt, 1);
228 SCTP_TCB_UNLOCK(stcb);
229 /*
230 * And now the final hack. We move data in the pending side i.e.
231 * head to the new socket buffer. Let the GRUBBING begin :-0
232 */
233 sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT);
234 atomic_subtract_int(&stcb->asoc.refcnt, 1);
235 return (newso);
236}