FreeBSD/Linux Kernel Cross Reference
sys/net/raw_usrreq.c
1 /*-
2 * Copyright (c) 1980, 1986, 1993
3 * The Regents of the University of California.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 4. Neither the name of the University nor the names of its contributors
15 * may be used to endorse or promote products derived from this software
16 * without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 *
30 * @(#)raw_usrreq.c 8.1 (Berkeley) 6/10/93
31 * $FreeBSD: releng/7.4/sys/net/raw_usrreq.c 182546 2008-08-31 15:55:59Z rwatson $
32 */
33
34 #include <sys/param.h>
35 #include <sys/kernel.h>
36 #include <sys/lock.h>
37 #include <sys/malloc.h>
38 #include <sys/mbuf.h>
39 #include <sys/mutex.h>
40 #include <sys/priv.h>
41 #include <sys/protosw.h>
42 #include <sys/signalvar.h>
43 #include <sys/socket.h>
44 #include <sys/socketvar.h>
45 #include <sys/sx.h>
46 #include <sys/systm.h>
47
48 #include <net/raw_cb.h>
49
50 MTX_SYSINIT(rawcb_mtx, &rawcb_mtx, "rawcb", MTX_DEF);
51
52 /*
53 * Initialize raw connection block q.
54 */
55 void
56 raw_init(void)
57 {
58
59 LIST_INIT(&rawcb_list);
60 }
61
62 /*
63 * Raw protocol input routine. Find the socket associated with the packet(s)
64 * and move them over. If nothing exists for this packet, drop it.
65 */
66 /*
67 * Raw protocol interface.
68 */
69 void
70 raw_input(struct mbuf *m0, struct sockproto *proto, struct sockaddr *src)
71 {
72 struct rawcb *rp;
73 struct mbuf *m = m0;
74 struct socket *last;
75
76 last = 0;
77 mtx_lock(&rawcb_mtx);
78 LIST_FOREACH(rp, &rawcb_list, list) {
79 if (rp->rcb_proto.sp_family != proto->sp_family)
80 continue;
81 if (rp->rcb_proto.sp_protocol &&
82 rp->rcb_proto.sp_protocol != proto->sp_protocol)
83 continue;
84 if (last) {
85 struct mbuf *n;
86 n = m_copy(m, 0, (int)M_COPYALL);
87 if (n) {
88 if (sbappendaddr(&last->so_rcv, src,
89 n, (struct mbuf *)0) == 0)
90 /* should notify about lost packet */
91 m_freem(n);
92 else
93 sorwakeup(last);
94 }
95 }
96 last = rp->rcb_socket;
97 }
98 if (last) {
99 if (sbappendaddr(&last->so_rcv, src,
100 m, (struct mbuf *)0) == 0)
101 m_freem(m);
102 else
103 sorwakeup(last);
104 } else
105 m_freem(m);
106 mtx_unlock(&rawcb_mtx);
107 }
108
109 /*ARGSUSED*/
110 void
111 raw_ctlinput(int cmd, struct sockaddr *arg, void *dummy)
112 {
113
114 if (cmd < 0 || cmd >= PRC_NCMDS)
115 return;
116 /* INCOMPLETE */
117 }
118
119 static void
120 raw_uabort(struct socket *so)
121 {
122
123 KASSERT(sotorawcb(so) != NULL, ("raw_uabort: rp == NULL"));
124
125 soisdisconnected(so);
126 }
127
128 static void
129 raw_uclose(struct socket *so)
130 {
131
132 KASSERT(sotorawcb(so) != NULL, ("raw_uabort: rp == NULL"));
133
134 soisdisconnected(so);
135 }
136
137 /* pru_accept is EOPNOTSUPP */
138
139 static int
140 raw_uattach(struct socket *so, int proto, struct thread *td)
141 {
142 int error;
143
144 /*
145 * Implementors of raw sockets will already have allocated the PCB,
146 * so it must be non-NULL here.
147 */
148 KASSERT(sotorawcb(so) != NULL, ("raw_uattach: so_pcb == NULL"));
149
150 if (td != NULL) {
151 error = priv_check(td, PRIV_NET_RAW);
152 if (error)
153 return (error);
154 }
155 return (raw_attach(so, proto));
156 }
157
158 static int
159 raw_ubind(struct socket *so, struct sockaddr *nam, struct thread *td)
160 {
161
162 return (EINVAL);
163 }
164
165 static int
166 raw_uconnect(struct socket *so, struct sockaddr *nam, struct thread *td)
167 {
168
169 return (EINVAL);
170 }
171
172 /* pru_connect2 is EOPNOTSUPP */
173 /* pru_control is EOPNOTSUPP */
174
175 static void
176 raw_udetach(struct socket *so)
177 {
178 struct rawcb *rp = sotorawcb(so);
179
180 KASSERT(rp != NULL, ("raw_udetach: rp == NULL"));
181
182 raw_detach(rp);
183 }
184
185 static int
186 raw_udisconnect(struct socket *so)
187 {
188
189 KASSERT(sotorawcb(so) != NULL, ("raw_udisconnect: rp == NULL"));
190
191 return (ENOTCONN);
192 }
193
194 /* pru_listen is EOPNOTSUPP */
195
196 static int
197 raw_upeeraddr(struct socket *so, struct sockaddr **nam)
198 {
199
200 KASSERT(sotorawcb(so) != NULL, ("raw_upeeraddr: rp == NULL"));
201
202 return (ENOTCONN);
203 }
204
205 /* pru_rcvd is EOPNOTSUPP */
206 /* pru_rcvoob is EOPNOTSUPP */
207
208 static int
209 raw_usend(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
210 struct mbuf *control, struct thread *td)
211 {
212
213 KASSERT(sotorawcb(so) != NULL, ("raw_usend: rp == NULL"));
214
215 if ((flags & PRUS_OOB) || (control && control->m_len)) {
216 /* XXXRW: Should control also be freed here? */
217 if (m != NULL)
218 m_freem(m);
219 return (EOPNOTSUPP);
220 }
221
222 /*
223 * For historical (bad?) reasons, we effectively ignore the address
224 * argument to sendto(2). Perhaps we should return an error instead?
225 */
226 return ((*so->so_proto->pr_output)(m, so));
227 }
228
229 /* pru_sense is null */
230
231 static int
232 raw_ushutdown(struct socket *so)
233 {
234
235 KASSERT(sotorawcb(so) != NULL, ("raw_ushutdown: rp == NULL"));
236
237 socantsendmore(so);
238 return (0);
239 }
240
241 static int
242 raw_usockaddr(struct socket *so, struct sockaddr **nam)
243 {
244
245 KASSERT(sotorawcb(so) != NULL, ("raw_usockaddr: rp == NULL"));
246
247 return (EINVAL);
248 }
249
250 struct pr_usrreqs raw_usrreqs = {
251 .pru_abort = raw_uabort,
252 .pru_attach = raw_uattach,
253 .pru_bind = raw_ubind,
254 .pru_connect = raw_uconnect,
255 .pru_detach = raw_udetach,
256 .pru_disconnect = raw_udisconnect,
257 .pru_peeraddr = raw_upeeraddr,
258 .pru_send = raw_usend,
259 .pru_shutdown = raw_ushutdown,
260 .pru_sockaddr = raw_usockaddr,
261 .pru_close = raw_uclose,
262 };
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