raw_usrreq.c revision 139823 
1/*-
2 * Copyright (c) 1980, 1986, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 *	@(#)raw_usrreq.c	8.1 (Berkeley) 6/10/93
30 * $FreeBSD: head/sys/net/raw_usrreq.c 139823 2005-01-07 01:45:51Z imp $
31 */
32
33#include <sys/param.h>
34#include <sys/kernel.h>
35#include <sys/lock.h>
36#include <sys/malloc.h>
37#include <sys/mbuf.h>
38#include <sys/mutex.h>
39#include <sys/protosw.h>
40#include <sys/signalvar.h>
41#include <sys/socket.h>
42#include <sys/socketvar.h>
43#include <sys/sx.h>
44#include <sys/systm.h>
45
46#include <net/raw_cb.h>
47
48MTX_SYSINIT(rawcb_mtx, &rawcb_mtx, "rawcb", MTX_DEF);
49
50/*
51 * Initialize raw connection block q.
52 */
53void
54raw_init()
55{
56
57	LIST_INIT(&rawcb_list);
58}
59
60
61/*
62 * Raw protocol input routine.  Find the socket
63 * associated with the packet(s) and move them over.  If
64 * nothing exists for this packet, drop it.
65 */
66/*
67 * Raw protocol interface.
68 */
69void
70raw_input(m0, proto, src, dst)
71	struct mbuf *m0;
72	register struct sockproto *proto;
73	struct sockaddr *src, *dst;
74{
75	register struct rawcb *rp;
76	register struct mbuf *m = m0;
77	struct socket *last;
78
79	last = 0;
80	mtx_lock(&rawcb_mtx);
81	LIST_FOREACH(rp, &rawcb_list, list) {
82		if (rp->rcb_proto.sp_family != proto->sp_family)
83			continue;
84		if (rp->rcb_proto.sp_protocol  &&
85		    rp->rcb_proto.sp_protocol != proto->sp_protocol)
86			continue;
87		/*
88		 * We assume the lower level routines have
89		 * placed the address in a canonical format
90		 * suitable for a structure comparison.
91		 *
92		 * Note that if the lengths are not the same
93		 * the comparison will fail at the first byte.
94		 */
95#define	equal(a1, a2) \
96  (bcmp((caddr_t)(a1), (caddr_t)(a2), a1->sa_len) == 0)
97		if (rp->rcb_laddr && !equal(rp->rcb_laddr, dst))
98			continue;
99		if (rp->rcb_faddr && !equal(rp->rcb_faddr, src))
100			continue;
101		if (last) {
102			struct mbuf *n;
103			n = m_copy(m, 0, (int)M_COPYALL);
104			if (n) {
105				if (sbappendaddr(&last->so_rcv, src,
106				    n, (struct mbuf *)0) == 0)
107					/* should notify about lost packet */
108					m_freem(n);
109				else {
110					sorwakeup(last);
111				}
112			}
113		}
114		last = rp->rcb_socket;
115	}
116	if (last) {
117		if (sbappendaddr(&last->so_rcv, src,
118		    m, (struct mbuf *)0) == 0)
119			m_freem(m);
120		else {
121			sorwakeup(last);
122		}
123	} else
124		m_freem(m);
125	mtx_unlock(&rawcb_mtx);
126}
127
128/*ARGSUSED*/
129void
130raw_ctlinput(cmd, arg, dummy)
131	int cmd;
132	struct sockaddr *arg;
133	void *dummy;
134{
135
136	if (cmd < 0 || cmd >= PRC_NCMDS)
137		return;
138	/* INCOMPLETE */
139}
140
141static int
142raw_uabort(struct socket *so)
143{
144	struct rawcb *rp = sotorawcb(so);
145
146	if (rp == 0)
147		return EINVAL;
148	raw_disconnect(rp);
149	soisdisconnected(so);
150	ACCEPT_LOCK();
151	SOCK_LOCK(so);
152	sotryfree(so);
153	return 0;
154}
155
156/* pru_accept is EOPNOTSUPP */
157
158static int
159raw_uattach(struct socket *so, int proto, struct thread *td)
160{
161	struct rawcb *rp = sotorawcb(so);
162	int error;
163
164	if (rp == 0)
165		return EINVAL;
166	if (td && (error = suser(td)) != 0)
167		return error;
168	return raw_attach(so, proto);
169}
170
171static int
172raw_ubind(struct socket *so, struct sockaddr *nam, struct thread *td)
173{
174	return EINVAL;
175}
176
177static int
178raw_uconnect(struct socket *so, struct sockaddr *nam, struct thread *td)
179{
180	return EINVAL;
181}
182
183/* pru_connect2 is EOPNOTSUPP */
184/* pru_control is EOPNOTSUPP */
185
186static int
187raw_udetach(struct socket *so)
188{
189	struct rawcb *rp = sotorawcb(so);
190
191	if (rp == 0)
192		return EINVAL;
193
194	raw_detach(rp);
195	return 0;
196}
197
198static int
199raw_udisconnect(struct socket *so)
200{
201	struct rawcb *rp = sotorawcb(so);
202
203	if (rp == 0)
204		return EINVAL;
205	if (rp->rcb_faddr == 0) {
206		return ENOTCONN;
207	}
208	raw_disconnect(rp);
209	soisdisconnected(so);
210	return 0;
211}
212
213/* pru_listen is EOPNOTSUPP */
214
215static int
216raw_upeeraddr(struct socket *so, struct sockaddr **nam)
217{
218	struct rawcb *rp = sotorawcb(so);
219
220	if (rp == 0)
221		return EINVAL;
222	if (rp->rcb_faddr == 0) {
223		return ENOTCONN;
224	}
225	*nam = sodupsockaddr(rp->rcb_faddr, M_WAITOK);
226	return 0;
227}
228
229/* pru_rcvd is EOPNOTSUPP */
230/* pru_rcvoob is EOPNOTSUPP */
231
232static int
233raw_usend(struct socket *so, int flags, struct mbuf *m,
234	  struct sockaddr *nam, struct mbuf *control, struct thread *td)
235{
236	int error;
237	struct rawcb *rp = sotorawcb(so);
238
239	if (rp == 0) {
240		error = EINVAL;
241		goto release;
242	}
243
244	if (flags & PRUS_OOB) {
245		error = EOPNOTSUPP;
246		goto release;
247	}
248
249	if (control && control->m_len) {
250		error = EOPNOTSUPP;
251		goto release;
252	}
253	if (nam) {
254		if (rp->rcb_faddr) {
255			error = EISCONN;
256			goto release;
257		}
258		rp->rcb_faddr = nam;
259	} else if (rp->rcb_faddr == 0) {
260		error = ENOTCONN;
261		goto release;
262	}
263	error = (*so->so_proto->pr_output)(m, so);
264	m = NULL;
265	if (nam)
266		rp->rcb_faddr = 0;
267release:
268	if (m != NULL)
269		m_freem(m);
270	return (error);
271}
272
273/* pru_sense is null */
274
275static int
276raw_ushutdown(struct socket *so)
277{
278	struct rawcb *rp = sotorawcb(so);
279
280	if (rp == 0)
281		return EINVAL;
282	socantsendmore(so);
283	return 0;
284}
285
286static int
287raw_usockaddr(struct socket *so, struct sockaddr **nam)
288{
289	struct rawcb *rp = sotorawcb(so);
290
291	if (rp == 0)
292		return EINVAL;
293	if (rp->rcb_laddr == 0)
294		return EINVAL;
295	*nam = sodupsockaddr(rp->rcb_laddr, M_WAITOK);
296	return 0;
297}
298
299struct pr_usrreqs raw_usrreqs = {
300	.pru_abort =		raw_uabort,
301	.pru_attach =		raw_uattach,
302	.pru_bind =		raw_ubind,
303	.pru_connect =		raw_uconnect,
304	.pru_detach =		raw_udetach,
305	.pru_disconnect =	raw_udisconnect,
306	.pru_peeraddr =		raw_upeeraddr,
307	.pru_send =		raw_usend,
308	.pru_shutdown =		raw_ushutdown,
309	.pru_sockaddr =		raw_usockaddr,
310};
311