1/*-
2 * Copyright (c) 2001-2007, 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 167598 2007-03-15 11:27:14Z rrs $");
36#include <netinet/sctp_os.h>
37#include <netinet/sctp_pcb.h>
38#include <netinet/sctp.h>
39#include <netinet/sctp_uio.h>
40#include <netinet/sctp_var.h>
41#include <netinet/sctp_peeloff.h>
42#include <netinet/sctputil.h>
43#include <netinet/sctp_auth.h>
44
45
46#ifdef SCTP_DEBUG
47extern uint32_t sctp_debug_on;
48
49#endif /* SCTP_DEBUG */
50
51
52int
53sctp_can_peel_off(struct socket *head, sctp_assoc_t assoc_id)
54{
55 struct sctp_inpcb *inp;
56 struct sctp_tcb *stcb;
57
58 inp = (struct sctp_inpcb *)head->so_pcb;
59 if (inp == NULL) {
60 return (EFAULT);
61 }
62 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1);
63 if (stcb == NULL) {
64 return (ENOTCONN);
65 }
66 SCTP_TCB_UNLOCK(stcb);
67 /* We are clear to peel this one off */
68 return (0);
69}
70
71int
72sctp_do_peeloff(struct socket *head, struct socket *so, sctp_assoc_t assoc_id)
73{
74 struct sctp_inpcb *inp, *n_inp;
75 struct sctp_tcb *stcb;
76
77 inp = (struct sctp_inpcb *)head->so_pcb;
78 if (inp == NULL)
79 return (EFAULT);
80 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1);
81 if (stcb == NULL)
82 return (ENOTCONN);
83
84 n_inp = (struct sctp_inpcb *)so->so_pcb;
85 n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE |
86 SCTP_PCB_FLAGS_CONNECTED |
87 SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */
88 (SCTP_PCB_COPY_FLAGS & inp->sctp_flags));
89 n_inp->sctp_socket = so;
90 n_inp->sctp_features = inp->sctp_features;
91 n_inp->sctp_frag_point = inp->sctp_frag_point;
92 n_inp->partial_delivery_point = inp->partial_delivery_point;
93 n_inp->sctp_context = inp->sctp_context;
94 n_inp->inp_starting_point_for_iterator = NULL;
95
96 /*
97 * Now we must move it from one hash table to another and get the
98 * stcb in the right place.
99 */
100 sctp_move_pcb_and_assoc(inp, n_inp, stcb);
101
102 sctp_pull_off_control_to_new_inp(inp, n_inp, stcb);
103
104 SCTP_TCB_UNLOCK(stcb);
105 return (0);
106}
107
108struct socket *
109sctp_get_peeloff(struct socket *head, sctp_assoc_t assoc_id, int *error)
110{
111 struct socket *newso;
112 struct sctp_inpcb *inp, *n_inp;
113 struct sctp_tcb *stcb;
114
115#ifdef SCTP_DEBUG
116 if (sctp_debug_on & SCTP_DEBUG_PEEL1) {
117 printf("SCTP peel-off called\n");
118 }
119#endif /* SCTP_DEBUG */
120
121 inp = (struct sctp_inpcb *)head->so_pcb;
122 if (inp == NULL) {
123 *error = EFAULT;
124 return (NULL);
125 }
126 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1);
127 if (stcb == NULL) {
128 *error = ENOTCONN;
129 return (NULL);
130 }
131 newso = sonewconn(head, SS_ISCONNECTED
132 );
133 if (newso == NULL) {
134#ifdef SCTP_DEBUG
135 if (sctp_debug_on & SCTP_DEBUG_PEEL1) {
136 printf("sctp_peeloff:sonewconn failed err\n");
137 }
138#endif /* SCTP_DEBUG */
139 *error = ENOMEM;
140 SCTP_TCB_UNLOCK(stcb);
141 return (NULL);
142 }
143 n_inp = (struct sctp_inpcb *)newso->so_pcb;
144 SOCK_LOCK(head);
145 SCTP_INP_WLOCK(inp);
146 SCTP_INP_WLOCK(n_inp);
147 n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE |
148 SCTP_PCB_FLAGS_CONNECTED |
149 SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */
150 (SCTP_PCB_COPY_FLAGS & inp->sctp_flags));
151 n_inp->sctp_features = inp->sctp_features;
152 n_inp->sctp_frag_point = inp->sctp_frag_point;
153 n_inp->partial_delivery_point = inp->partial_delivery_point;
154 n_inp->sctp_context = inp->sctp_context;
155 n_inp->inp_starting_point_for_iterator = NULL;
156
157 /* copy in the authentication parameters from the original endpoint */
158 if (n_inp->sctp_ep.local_hmacs)
159 sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs);
160 n_inp->sctp_ep.local_hmacs =
161 sctp_copy_hmaclist(inp->sctp_ep.local_hmacs);
162 if (n_inp->sctp_ep.local_auth_chunks)
163 sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks);
164 n_inp->sctp_ep.local_auth_chunks =
165 sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks);
166 (void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys,
167 &n_inp->sctp_ep.shared_keys);
168
169 n_inp->sctp_socket = newso;
170 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) {
171 sctp_feature_off(n_inp, SCTP_PCB_FLAGS_AUTOCLOSE);
172 n_inp->sctp_ep.auto_close_time = 0;
173 sctp_timer_stop(SCTP_TIMER_TYPE_AUTOCLOSE, n_inp, stcb, NULL,
174 SCTP_FROM_SCTP_PEELOFF + SCTP_LOC_1);
175 }
176 /* Turn off any non-blocking semantic. */
177 SCTP_CLEAR_SO_NBIO(newso);
178 newso->so_state |= SS_ISCONNECTED;
179 /* We remove it right away */
180#ifdef SCTP_LOCK_LOGGING
181 sctp_log_lock(inp, (struct sctp_tcb *)NULL, SCTP_LOG_LOCK_SOCK);
182#endif
183 TAILQ_REMOVE(&head->so_comp, newso, so_list);
184 head->so_qlen--;
185 SOCK_UNLOCK(head);
186 /*
187 * Now we must move it from one hash table to another and get the
188 * stcb in the right place.
189 */
190 SCTP_INP_WUNLOCK(n_inp);
191 SCTP_INP_WUNLOCK(inp);
192 sctp_move_pcb_and_assoc(inp, n_inp, stcb);
193 /*
194 * And now the final hack. We move data in the pending side i.e.
195 * head to the new socket buffer. Let the GRUBBING begin :-0
196 */
197 sctp_pull_off_control_to_new_inp(inp, n_inp, stcb);
198
199 SCTP_TCB_UNLOCK(stcb);
200 return (newso);
201}