1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1980, 1986, 1993
5 * The Regents of the University of California.
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 University 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 REGENTS 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 REGENTS 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 * @(#)raw_usrreq.c 8.1 (Berkeley) 6/10/93
33 * $FreeBSD$
34 */
35
36 #include <sys/param.h>
37 #include <sys/kernel.h>
38 #include <sys/lock.h>
39 #include <sys/malloc.h>
40 #include <sys/mbuf.h>
41 #include <sys/mutex.h>
42 #include <sys/priv.h>
43 #include <sys/protosw.h>
44 #include <sys/signalvar.h>
45 #include <sys/socket.h>
46 #include <sys/socketvar.h>
47 #include <sys/sx.h>
48 #include <sys/systm.h>
49
50 #include <net/if.h>
51 #include <net/vnet.h>
52 #include <net/raw_cb.h>
53
54 MTX_SYSINIT(rawcb_mtx, &rawcb_mtx, "rawcb", MTX_DEF);
55
56 /*
57 * Initialize raw connection block q.
58 */
59 void
raw_init(void)60 raw_init(void)
61 {
62
63 LIST_INIT(&V_rawcb_list);
64 }
65
66 /*
67 * Raw protocol input routine. Find the socket associated with the packet(s)
68 * and move them over. If nothing exists for this packet, drop it.
69 */
70 /*
71 * Raw protocol interface.
72 */
73 void
raw_input(struct mbuf * m0,struct sockproto * proto,struct sockaddr * src)74 raw_input(struct mbuf *m0, struct sockproto *proto, struct sockaddr *src)
75 {
76
77 return (raw_input_ext(m0, proto, src, NULL));
78 }
79
80 void
raw_input_ext(struct mbuf * m0,struct sockproto * proto,struct sockaddr * src,raw_input_cb_fn cb)81 raw_input_ext(struct mbuf *m0, struct sockproto *proto, struct sockaddr *src,
82 raw_input_cb_fn cb)
83 {
84 struct rawcb *rp;
85 struct mbuf *m = m0;
86 struct socket *last;
87
88 last = NULL;
89 mtx_lock(&rawcb_mtx);
90 LIST_FOREACH(rp, &V_rawcb_list, list) {
91 if (rp->rcb_proto.sp_family != proto->sp_family)
92 continue;
93 if (rp->rcb_proto.sp_protocol &&
94 rp->rcb_proto.sp_protocol != proto->sp_protocol)
95 continue;
96 if (cb != NULL && (*cb)(m, proto, src, rp) != 0)
97 continue;
98 if (last) {
99 struct mbuf *n;
100 n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
101 if (n) {
102 if (sbappendaddr(&last->so_rcv, src,
103 n, (struct mbuf *)0) == 0) {
104 soroverflow(last);
105 m_freem(n);
106 } else
107 sorwakeup(last);
108 }
109 }
110 last = rp->rcb_socket;
111 }
112 if (last) {
113 if (sbappendaddr(&last->so_rcv, src,
114 m, (struct mbuf *)0) == 0) {
115 soroverflow(last);
116 m_freem(m);
117 } else
118 sorwakeup(last);
119 } else
120 m_freem(m);
121 mtx_unlock(&rawcb_mtx);
122 }
123
124 /*ARGSUSED*/
125 void
raw_ctlinput(int cmd,struct sockaddr * arg,void * dummy)126 raw_ctlinput(int cmd, struct sockaddr *arg, void *dummy)
127 {
128
129 if (cmd < 0 || cmd >= PRC_NCMDS)
130 return;
131 /* INCOMPLETE */
132 }
133
134 static void
raw_uabort(struct socket * so)135 raw_uabort(struct socket *so)
136 {
137
138 KASSERT(sotorawcb(so) != NULL, ("raw_uabort: rp == NULL"));
139
140 soisdisconnected(so);
141 }
142
143 static void
raw_uclose(struct socket * so)144 raw_uclose(struct socket *so)
145 {
146
147 KASSERT(sotorawcb(so) != NULL, ("raw_uabort: rp == NULL"));
148
149 soisdisconnected(so);
150 }
151
152 /* pru_accept is EOPNOTSUPP */
153
154 static int
raw_uattach(struct socket * so,int proto,struct thread * td)155 raw_uattach(struct socket *so, int proto, struct thread *td)
156 {
157 int error;
158
159 /*
160 * Implementors of raw sockets will already have allocated the PCB,
161 * so it must be non-NULL here.
162 */
163 KASSERT(sotorawcb(so) != NULL, ("raw_uattach: so_pcb == NULL"));
164
165 if (td != NULL) {
166 error = priv_check(td, PRIV_NET_RAW);
167 if (error)
168 return (error);
169 }
170 return (raw_attach(so, proto));
171 }
172
173 static int
raw_ubind(struct socket * so,struct sockaddr * nam,struct thread * td)174 raw_ubind(struct socket *so, struct sockaddr *nam, struct thread *td)
175 {
176
177 return (EINVAL);
178 }
179
180 static int
raw_uconnect(struct socket * so,struct sockaddr * nam,struct thread * td)181 raw_uconnect(struct socket *so, struct sockaddr *nam, struct thread *td)
182 {
183
184 return (EINVAL);
185 }
186
187 /* pru_connect2 is EOPNOTSUPP */
188 /* pru_control is EOPNOTSUPP */
189
190 static void
raw_udetach(struct socket * so)191 raw_udetach(struct socket *so)
192 {
193 struct rawcb *rp = sotorawcb(so);
194
195 KASSERT(rp != NULL, ("raw_udetach: rp == NULL"));
196
197 raw_detach(rp);
198 }
199
200 static int
raw_udisconnect(struct socket * so)201 raw_udisconnect(struct socket *so)
202 {
203
204 KASSERT(sotorawcb(so) != NULL, ("raw_udisconnect: rp == NULL"));
205
206 return (ENOTCONN);
207 }
208
209 /* pru_listen is EOPNOTSUPP */
210
211 static int
raw_upeeraddr(struct socket * so,struct sockaddr ** nam)212 raw_upeeraddr(struct socket *so, struct sockaddr **nam)
213 {
214
215 KASSERT(sotorawcb(so) != NULL, ("raw_upeeraddr: rp == NULL"));
216
217 return (ENOTCONN);
218 }
219
220 /* pru_rcvd is EOPNOTSUPP */
221 /* pru_rcvoob is EOPNOTSUPP */
222
223 static int
raw_usend(struct socket * so,int flags,struct mbuf * m,struct sockaddr * nam,struct mbuf * control,struct thread * td)224 raw_usend(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
225 struct mbuf *control, struct thread *td)
226 {
227
228 KASSERT(sotorawcb(so) != NULL, ("raw_usend: rp == NULL"));
229
230 if ((flags & PRUS_OOB) || (control && control->m_len)) {
231 if (m != NULL)
232 m_freem(m);
233 if (control != NULL)
234 m_freem(control);
235 return (EOPNOTSUPP);
236 }
237
238 /*
239 * For historical (bad?) reasons, we effectively ignore the address
240 * argument to sendto(2). Perhaps we should return an error instead?
241 */
242 return ((*so->so_proto->pr_output)(m, so));
243 }
244
245 /* pru_sense is null */
246
247 static int
raw_ushutdown(struct socket * so)248 raw_ushutdown(struct socket *so)
249 {
250
251 KASSERT(sotorawcb(so) != NULL, ("raw_ushutdown: rp == NULL"));
252
253 socantsendmore(so);
254 return (0);
255 }
256
257 static int
raw_usockaddr(struct socket * so,struct sockaddr ** nam)258 raw_usockaddr(struct socket *so, struct sockaddr **nam)
259 {
260
261 KASSERT(sotorawcb(so) != NULL, ("raw_usockaddr: rp == NULL"));
262
263 return (EINVAL);
264 }
265
266 struct pr_usrreqs raw_usrreqs = {
267 .pru_abort = raw_uabort,
268 .pru_attach = raw_uattach,
269 .pru_bind = raw_ubind,
270 .pru_connect = raw_uconnect,
271 .pru_detach = raw_udetach,
272 .pru_disconnect = raw_udisconnect,
273 .pru_peeraddr = raw_upeeraddr,
274 .pru_send = raw_usend,
275 .pru_shutdown = raw_ushutdown,
276 .pru_sockaddr = raw_usockaddr,
277 .pru_close = raw_uclose,
278 };
279