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/8.2/sys/net/raw_usrreq.c 196019 2009-08-01 19:26:27Z 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/if.h>
49 #include <net/raw_cb.h>
50 #include <net/vnet.h>
51
52 MTX_SYSINIT(rawcb_mtx, &rawcb_mtx, "rawcb", MTX_DEF);
53
54 /*
55 * Initialize raw connection block q.
56 */
57 void
58 raw_init(void)
59 {
60
61 LIST_INIT(&V_rawcb_list);
62 }
63
64 /*
65 * Raw protocol input routine. Find the socket associated with the packet(s)
66 * and move them over. If nothing exists for this packet, drop it.
67 */
68 /*
69 * Raw protocol interface.
70 */
71 void
72 raw_input(struct mbuf *m0, struct sockproto *proto, struct sockaddr *src)
73 {
74 struct rawcb *rp;
75 struct mbuf *m = m0;
76 struct socket *last;
77
78 last = 0;
79 mtx_lock(&rawcb_mtx);
80 LIST_FOREACH(rp, &V_rawcb_list, list) {
81 if (rp->rcb_proto.sp_family != proto->sp_family)
82 continue;
83 if (rp->rcb_proto.sp_protocol &&
84 rp->rcb_proto.sp_protocol != proto->sp_protocol)
85 continue;
86 if (last) {
87 struct mbuf *n;
88 n = m_copy(m, 0, (int)M_COPYALL);
89 if (n) {
90 if (sbappendaddr(&last->so_rcv, src,
91 n, (struct mbuf *)0) == 0)
92 /* should notify about lost packet */
93 m_freem(n);
94 else
95 sorwakeup(last);
96 }
97 }
98 last = rp->rcb_socket;
99 }
100 if (last) {
101 if (sbappendaddr(&last->so_rcv, src,
102 m, (struct mbuf *)0) == 0)
103 m_freem(m);
104 else
105 sorwakeup(last);
106 } else
107 m_freem(m);
108 mtx_unlock(&rawcb_mtx);
109 }
110
111 /*ARGSUSED*/
112 void
113 raw_ctlinput(int cmd, struct sockaddr *arg, void *dummy)
114 {
115
116 if (cmd < 0 || cmd >= PRC_NCMDS)
117 return;
118 /* INCOMPLETE */
119 }
120
121 static void
122 raw_uabort(struct socket *so)
123 {
124
125 KASSERT(sotorawcb(so) != NULL, ("raw_uabort: rp == NULL"));
126
127 soisdisconnected(so);
128 }
129
130 static void
131 raw_uclose(struct socket *so)
132 {
133
134 KASSERT(sotorawcb(so) != NULL, ("raw_uabort: rp == NULL"));
135
136 soisdisconnected(so);
137 }
138
139 /* pru_accept is EOPNOTSUPP */
140
141 static int
142 raw_uattach(struct socket *so, int proto, struct thread *td)
143 {
144 int error;
145
146 /*
147 * Implementors of raw sockets will already have allocated the PCB,
148 * so it must be non-NULL here.
149 */
150 KASSERT(sotorawcb(so) != NULL, ("raw_uattach: so_pcb == NULL"));
151
152 if (td != NULL) {
153 error = priv_check(td, PRIV_NET_RAW);
154 if (error)
155 return (error);
156 }
157 return (raw_attach(so, proto));
158 }
159
160 static int
161 raw_ubind(struct socket *so, struct sockaddr *nam, struct thread *td)
162 {
163
164 return (EINVAL);
165 }
166
167 static int
168 raw_uconnect(struct socket *so, struct sockaddr *nam, struct thread *td)
169 {
170
171 return (EINVAL);
172 }
173
174 /* pru_connect2 is EOPNOTSUPP */
175 /* pru_control is EOPNOTSUPP */
176
177 static void
178 raw_udetach(struct socket *so)
179 {
180 struct rawcb *rp = sotorawcb(so);
181
182 KASSERT(rp != NULL, ("raw_udetach: rp == NULL"));
183
184 raw_detach(rp);
185 }
186
187 static int
188 raw_udisconnect(struct socket *so)
189 {
190
191 KASSERT(sotorawcb(so) != NULL, ("raw_udisconnect: rp == NULL"));
192
193 return (ENOTCONN);
194 }
195
196 /* pru_listen is EOPNOTSUPP */
197
198 static int
199 raw_upeeraddr(struct socket *so, struct sockaddr **nam)
200 {
201
202 KASSERT(sotorawcb(so) != NULL, ("raw_upeeraddr: rp == NULL"));
203
204 return (ENOTCONN);
205 }
206
207 /* pru_rcvd is EOPNOTSUPP */
208 /* pru_rcvoob is EOPNOTSUPP */
209
210 static int
211 raw_usend(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
212 struct mbuf *control, struct thread *td)
213 {
214
215 KASSERT(sotorawcb(so) != NULL, ("raw_usend: rp == NULL"));
216
217 if ((flags & PRUS_OOB) || (control && control->m_len)) {
218 /* XXXRW: Should control also be freed here? */
219 if (m != NULL)
220 m_freem(m);
221 return (EOPNOTSUPP);
222 }
223
224 /*
225 * For historical (bad?) reasons, we effectively ignore the address
226 * argument to sendto(2). Perhaps we should return an error instead?
227 */
228 return ((*so->so_proto->pr_output)(m, so));
229 }
230
231 /* pru_sense is null */
232
233 static int
234 raw_ushutdown(struct socket *so)
235 {
236
237 KASSERT(sotorawcb(so) != NULL, ("raw_ushutdown: rp == NULL"));
238
239 socantsendmore(so);
240 return (0);
241 }
242
243 static int
244 raw_usockaddr(struct socket *so, struct sockaddr **nam)
245 {
246
247 KASSERT(sotorawcb(so) != NULL, ("raw_usockaddr: rp == NULL"));
248
249 return (EINVAL);
250 }
251
252 struct pr_usrreqs raw_usrreqs = {
253 .pru_abort = raw_uabort,
254 .pru_attach = raw_uattach,
255 .pru_bind = raw_ubind,
256 .pru_connect = raw_uconnect,
257 .pru_detach = raw_udetach,
258 .pru_disconnect = raw_udisconnect,
259 .pru_peeraddr = raw_upeeraddr,
260 .pru_send = raw_usend,
261 .pru_shutdown = raw_ushutdown,
262 .pru_sockaddr = raw_usockaddr,
263 .pru_close = raw_uclose,
264 };
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