1 /* $KAME: sctp_peeloff.c,v 1.13 2005/03/06 16:04:18 itojun Exp $ */
2 /* $NetBSD: sctp_peeloff.c,v 1.2 2016/04/25 21:21:02 rjs Exp $ */
3
4 /*
5 * Copyright (C) 2002, 2003 Cisco Systems Inc,
6 * 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
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32 #include <sys/cdefs.h>
33 __KERNEL_RCSID(0, "$NetBSD: sctp_peeloff.c,v 1.2 2016/04/25 21:21:02 rjs Exp $");
34
35 #ifdef _KERNEL_OPT
36 #include "opt_inet.h"
37 #include "opt_ipsec.h"
38 #include "opt_sctp.h"
39 #endif /* _KERNEL_OPT */
40
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/kernel.h>
44 #include <sys/malloc.h>
45 #include <sys/mbuf.h>
46 #include <sys/domain.h>
47 #include <sys/proc.h>
48 #include <sys/protosw.h>
49 #include <sys/socket.h>
50 #include <sys/socketvar.h>
51 #include <sys/sysctl.h>
52 #include <sys/syslog.h>
53 #include <net/if.h>
54 #include <net/route.h>
55 #include <netinet/in.h>
56 #include <netinet/in_systm.h>
57 #include <netinet/ip.h>
58 #ifdef INET6
59 #include <netinet/ip6.h>
60 #endif
61 #include <netinet/in_pcb.h>
62 #include <netinet/in_var.h>
63 #include <netinet/ip_var.h>
64 #ifdef INET6
65 #include <netinet6/ip6_var.h>
66 #endif
67 #include <netinet/ip_icmp.h>
68 #include <netinet/icmp_var.h>
69 #include <netinet/sctp_pcb.h>
70 #include <netinet/sctp.h>
71 #include <netinet/sctp_uio.h>
72 #include <netinet/sctp_var.h>
73 #include <netinet/sctp_peeloff.h>
74 #include <netinet/sctputil.h>
75
76 #ifdef IPSEC
77 #include <netipsec/ipsec.h>
78 #include <netipsec/key.h>
79 #endif /*IPSEC*/
80
81 #ifdef SCTP_DEBUG
82 extern u_int32_t sctp_debug_on;
83 #endif /* SCTP_DEBUG */
84
85
86 int
sctp_can_peel_off(struct socket * head,u_int32_t assoc_id)87 sctp_can_peel_off(struct socket *head, u_int32_t assoc_id)
88 {
89 struct sctp_inpcb *inp;
90 struct sctp_tcb *stcb;
91 inp = (struct sctp_inpcb *)head->so_pcb;
92 if (inp == NULL) {
93 return (EFAULT);
94 }
95 stcb = sctp_findassociation_ep_asocid(inp, assoc_id);
96 if (stcb == NULL) {
97 return (ENOTCONN);
98 }
99 /* We are clear to peel this one off */
100 return (0);
101 }
102
103 int
sctp_do_peeloff(struct socket * head,struct socket * so,u_int32_t assoc_id)104 sctp_do_peeloff(struct socket *head, struct socket *so, u_int32_t assoc_id)
105 {
106 struct sctp_inpcb *inp, *n_inp;
107 struct sctp_tcb *stcb;
108
109 inp = (struct sctp_inpcb *)head->so_pcb;
110 if (inp == NULL)
111 return (EFAULT);
112 stcb = sctp_findassociation_ep_asocid(inp, assoc_id);
113 if (stcb == NULL)
114 return (ENOTCONN);
115
116 n_inp = (struct sctp_inpcb *)so->so_pcb;
117 n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE |
118 SCTP_PCB_FLAGS_CONNECTED |
119 SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */
120 (SCTP_PCB_COPY_FLAGS & inp->sctp_flags));
121 n_inp->sctp_socket = so;
122
123 /*
124 * Now we must move it from one hash table to another and get
125 * the stcb in the right place.
126 */
127 sctp_move_pcb_and_assoc(inp, n_inp, stcb);
128 /*
129 * And now the final hack. We move data in the
130 * pending side i.e. head to the new socket
131 * buffer. Let the GRUBBING begin :-0
132 */
133 sctp_grub_through_socket_buffer(inp, head, so, stcb);
134 return (0);
135 }
136
137 struct socket *
sctp_get_peeloff(struct socket * head,u_int32_t assoc_id,int * error)138 sctp_get_peeloff(struct socket *head, u_int32_t assoc_id, int *error)
139 {
140 struct socket *newso;
141 struct sctp_inpcb *inp, *n_inp;
142 struct sctp_tcb *stcb;
143
144 #ifdef SCTP_DEBUG
145 if (sctp_debug_on & SCTP_DEBUG_PEEL1) {
146 printf("SCTP peel-off called\n");
147 }
148 #endif /* SCTP_DEBUG */
149
150 inp = (struct sctp_inpcb *)head->so_pcb;
151 if (inp == NULL) {
152 *error = EFAULT;
153 return (NULL);
154 }
155 stcb = sctp_findassociation_ep_asocid(inp, assoc_id);
156 if (stcb == NULL) {
157 *error = ENOTCONN;
158 return (NULL);
159 }
160 newso = sonewconn(head, SS_ISCONNECTED);
161 if (newso == NULL) {
162 #ifdef SCTP_DEBUG
163 if (sctp_debug_on & SCTP_DEBUG_PEEL1) {
164 printf("sctp_peeloff:sonewconn failed err\n");
165 }
166 #endif /* SCTP_DEBUG */
167 *error = ENOMEM;
168 SCTP_TCB_UNLOCK(stcb);
169 return (NULL);
170 }
171 n_inp = (struct sctp_inpcb *)newso->so_pcb;
172 SCTP_INP_WLOCK(n_inp);
173 n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE |
174 SCTP_PCB_FLAGS_CONNECTED |
175 SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */
176 (SCTP_PCB_COPY_FLAGS & inp->sctp_flags));
177 n_inp->sctp_socket = newso;
178 /* Turn off any non-blocking symantic. */
179 newso->so_state &= ~SS_NBIO;
180 newso->so_state |= SS_ISCONNECTED;
181 /* We remove it right away */
182 newso = TAILQ_FIRST(&head->so_q);
183 if (soqremque(newso, 1) == 0)
184 panic("sctp_peeloff");
185
186 /*
187 * Now we must move it from one hash table to another and get
188 * the stcb in the right place.
189 */
190 SCTP_INP_WUNLOCK(n_inp);
191 sctp_move_pcb_and_assoc(inp, n_inp, stcb);
192 /*
193 * And now the final hack. We move data in the
194 * pending side i.e. head to the new socket
195 * buffer. Let the GRUBBING begin :-0
196 */
197 sctp_grub_through_socket_buffer(inp, head, newso, stcb);
198 SCTP_TCB_UNLOCK(stcb);
199 return (newso);
200 }
201