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 /* should notify about lost packet */
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 m_freem(m);
116 else
117 sorwakeup(last);
118 } else
119 m_freem(m);
120 mtx_unlock(&rawcb_mtx);
121 }
122
123 /*ARGSUSED*/
124 void
raw_ctlinput(int cmd,struct sockaddr * arg,void * dummy)125 raw_ctlinput(int cmd, struct sockaddr *arg, void *dummy)
126 {
127
128 if (cmd < 0 || cmd >= PRC_NCMDS)
129 return;
130 /* INCOMPLETE */
131 }
132
133 static void
raw_uabort(struct socket * so)134 raw_uabort(struct socket *so)
135 {
136
137 KASSERT(sotorawcb(so) != NULL, ("raw_uabort: rp == NULL"));
138
139 soisdisconnected(so);
140 }
141
142 static void
raw_uclose(struct socket * so)143 raw_uclose(struct socket *so)
144 {
145
146 KASSERT(sotorawcb(so) != NULL, ("raw_uabort: rp == NULL"));
147
148 soisdisconnected(so);
149 }
150
151 /* pru_accept is EOPNOTSUPP */
152
153 static int
raw_uattach(struct socket * so,int proto,struct thread * td)154 raw_uattach(struct socket *so, int proto, struct thread *td)
155 {
156 int error;
157
158 /*
159 * Implementors of raw sockets will already have allocated the PCB,
160 * so it must be non-NULL here.
161 */
162 KASSERT(sotorawcb(so) != NULL, ("raw_uattach: so_pcb == NULL"));
163
164 if (td != NULL) {
165 error = priv_check(td, PRIV_NET_RAW);
166 if (error)
167 return (error);
168 }
169 return (raw_attach(so, proto));
170 }
171
172 static int
raw_ubind(struct socket * so,struct sockaddr * nam,struct thread * td)173 raw_ubind(struct socket *so, struct sockaddr *nam, struct thread *td)
174 {
175
176 return (EINVAL);
177 }
178
179 static int
raw_uconnect(struct socket * so,struct sockaddr * nam,struct thread * td)180 raw_uconnect(struct socket *so, struct sockaddr *nam, struct thread *td)
181 {
182
183 return (EINVAL);
184 }
185
186 /* pru_connect2 is EOPNOTSUPP */
187 /* pru_control is EOPNOTSUPP */
188
189 static void
raw_udetach(struct socket * so)190 raw_udetach(struct socket *so)
191 {
192 struct rawcb *rp = sotorawcb(so);
193
194 KASSERT(rp != NULL, ("raw_udetach: rp == NULL"));
195
196 raw_detach(rp);
197 }
198
199 static int
raw_udisconnect(struct socket * so)200 raw_udisconnect(struct socket *so)
201 {
202
203 KASSERT(sotorawcb(so) != NULL, ("raw_udisconnect: rp == NULL"));
204
205 return (ENOTCONN);
206 }
207
208 /* pru_listen is EOPNOTSUPP */
209
210 static int
raw_upeeraddr(struct socket * so,struct sockaddr ** nam)211 raw_upeeraddr(struct socket *so, struct sockaddr **nam)
212 {
213
214 KASSERT(sotorawcb(so) != NULL, ("raw_upeeraddr: rp == NULL"));
215
216 return (ENOTCONN);
217 }
218
219 /* pru_rcvd is EOPNOTSUPP */
220 /* pru_rcvoob is EOPNOTSUPP */
221
222 static int
raw_usend(struct socket * so,int flags,struct mbuf * m,struct sockaddr * nam,struct mbuf * control,struct thread * td)223 raw_usend(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
224 struct mbuf *control, struct thread *td)
225 {
226
227 KASSERT(sotorawcb(so) != NULL, ("raw_usend: rp == NULL"));
228
229 if ((flags & PRUS_OOB) || (control && control->m_len)) {
230 if (m != NULL)
231 m_freem(m);
232 if (control != NULL)
233 m_freem(control);
234 return (EOPNOTSUPP);
235 }
236
237 /*
238 * For historical (bad?) reasons, we effectively ignore the address
239 * argument to sendto(2). Perhaps we should return an error instead?
240 */
241 return ((*so->so_proto->pr_output)(m, so));
242 }
243
244 /* pru_sense is null */
245
246 static int
raw_ushutdown(struct socket * so)247 raw_ushutdown(struct socket *so)
248 {
249
250 KASSERT(sotorawcb(so) != NULL, ("raw_ushutdown: rp == NULL"));
251
252 socantsendmore(so);
253 return (0);
254 }
255
256 static int
raw_usockaddr(struct socket * so,struct sockaddr ** nam)257 raw_usockaddr(struct socket *so, struct sockaddr **nam)
258 {
259
260 KASSERT(sotorawcb(so) != NULL, ("raw_usockaddr: rp == NULL"));
261
262 return (EINVAL);
263 }
264
265 struct pr_usrreqs raw_usrreqs = {
266 .pru_abort = raw_uabort,
267 .pru_attach = raw_uattach,
268 .pru_bind = raw_ubind,
269 .pru_connect = raw_uconnect,
270 .pru_detach = raw_udetach,
271 .pru_disconnect = raw_udisconnect,
272 .pru_peeraddr = raw_upeeraddr,
273 .pru_send = raw_usend,
274 .pru_shutdown = raw_ushutdown,
275 .pru_sockaddr = raw_usockaddr,
276 .pru_close = raw_uclose,
277 };
278