raw_usrreq.c revision 157366 
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 157366 2006-04-01 15:15:05Z rwatson $
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 void
142raw_uabort(struct socket *so)
143{
144	struct rawcb *rp = sotorawcb(so);
145
146	KASSERT(rp != NULL, ("raw_uabort: rp == NULL"));
147	raw_disconnect(rp);
148	soisdisconnected(so);
149}
150
151/* pru_accept is EOPNOTSUPP */
152
153static int
154raw_uattach(struct socket *so, int proto, struct thread *td)
155{
156	struct rawcb *rp = sotorawcb(so);
157	int error;
158
159	if (rp == 0)
160		return EINVAL;
161	if (td && (error = suser(td)) != 0)
162		return error;
163	return raw_attach(so, proto);
164}
165
166static int
167raw_ubind(struct socket *so, struct sockaddr *nam, struct thread *td)
168{
169	return EINVAL;
170}
171
172static int
173raw_uconnect(struct socket *so, struct sockaddr *nam, struct thread *td)
174{
175	return EINVAL;
176}
177
178/* pru_connect2 is EOPNOTSUPP */
179/* pru_control is EOPNOTSUPP */
180
181static int
182raw_udetach(struct socket *so)
183{
184	struct rawcb *rp = sotorawcb(so);
185
186	if (rp == 0)
187		return EINVAL;
188
189	raw_detach(rp);
190	return 0;
191}
192
193static int
194raw_udisconnect(struct socket *so)
195{
196	struct rawcb *rp = sotorawcb(so);
197
198	if (rp == 0)
199		return EINVAL;
200	if (rp->rcb_faddr == 0) {
201		return ENOTCONN;
202	}
203	raw_disconnect(rp);
204	soisdisconnected(so);
205	return 0;
206}
207
208/* pru_listen is EOPNOTSUPP */
209
210static int
211raw_upeeraddr(struct socket *so, struct sockaddr **nam)
212{
213	struct rawcb *rp = sotorawcb(so);
214
215	if (rp == 0)
216		return EINVAL;
217	if (rp->rcb_faddr == 0) {
218		return ENOTCONN;
219	}
220	*nam = sodupsockaddr(rp->rcb_faddr, M_WAITOK);
221	return 0;
222}
223
224/* pru_rcvd is EOPNOTSUPP */
225/* pru_rcvoob is EOPNOTSUPP */
226
227static int
228raw_usend(struct socket *so, int flags, struct mbuf *m,
229	  struct sockaddr *nam, struct mbuf *control, struct thread *td)
230{
231	int error;
232	struct rawcb *rp = sotorawcb(so);
233
234	if (rp == 0) {
235		error = EINVAL;
236		goto release;
237	}
238
239	if (flags & PRUS_OOB) {
240		error = EOPNOTSUPP;
241		goto release;
242	}
243
244	if (control && control->m_len) {
245		error = EOPNOTSUPP;
246		goto release;
247	}
248	if (nam) {
249		if (rp->rcb_faddr) {
250			error = EISCONN;
251			goto release;
252		}
253		rp->rcb_faddr = nam;
254	} else if (rp->rcb_faddr == 0) {
255		error = ENOTCONN;
256		goto release;
257	}
258	error = (*so->so_proto->pr_output)(m, so);
259	m = NULL;
260	if (nam)
261		rp->rcb_faddr = 0;
262release:
263	if (m != NULL)
264		m_freem(m);
265	return (error);
266}
267
268/* pru_sense is null */
269
270static int
271raw_ushutdown(struct socket *so)
272{
273	struct rawcb *rp = sotorawcb(so);
274
275	if (rp == 0)
276		return EINVAL;
277	socantsendmore(so);
278	return 0;
279}
280
281static int
282raw_usockaddr(struct socket *so, struct sockaddr **nam)
283{
284	struct rawcb *rp = sotorawcb(so);
285
286	if (rp == 0)
287		return EINVAL;
288	if (rp->rcb_laddr == 0)
289		return EINVAL;
290	*nam = sodupsockaddr(rp->rcb_laddr, M_WAITOK);
291	return 0;
292}
293
294struct pr_usrreqs raw_usrreqs = {
295	.pru_abort =		raw_uabort,
296	.pru_attach =		raw_uattach,
297	.pru_bind =		raw_ubind,
298	.pru_connect =		raw_uconnect,
299	.pru_detach =		raw_udetach,
300	.pru_disconnect =	raw_udisconnect,
301	.pru_peeraddr =		raw_upeeraddr,
302	.pru_send =		raw_usend,
303	.pru_shutdown =		raw_ushutdown,
304	.pru_sockaddr =		raw_usockaddr,
305};
306