raw_usrreq.c revision 180305 
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: head/sys/net/raw_usrreq.c 180305 2008-07-05 18:03:39Z 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/raw_cb.h>
49
50MTX_SYSINIT(rawcb_mtx, &rawcb_mtx, "rawcb", MTX_DEF);
51
52/*
53 * Initialize raw connection block q.
54 */
55void
56raw_init(void)
57{
58
59	LIST_INIT(&rawcb_list);
60}
61
62/*
63 * Raw protocol input routine.  Find the socket associated with the packet(s)
64 * and move them over.  If nothing exists for this packet, drop it.
65 */
66/*
67 * Raw protocol interface.
68 */
69void
70raw_input(struct mbuf *m0, struct sockproto *proto, struct sockaddr *src,
71    struct sockaddr *dst)
72{
73	struct rawcb *rp;
74	struct mbuf *m = m0;
75	struct socket *last;
76
77	last = 0;
78	mtx_lock(&rawcb_mtx);
79	LIST_FOREACH(rp, &rawcb_list, list) {
80		if (rp->rcb_proto.sp_family != proto->sp_family)
81			continue;
82		if (rp->rcb_proto.sp_protocol  &&
83		    rp->rcb_proto.sp_protocol != proto->sp_protocol)
84			continue;
85		/*
86		 * We assume the lower level routines have placed the address
87		 * in a canonical format suitable for a structure comparison.
88		 *
89		 * Note that if the lengths are not the same the comparison
90		 * will fail at the first byte.
91		 */
92#define	equal(a1, a2) \
93  (bcmp((caddr_t)(a1), (caddr_t)(a2), a1->sa_len) == 0)
94		if (rp->rcb_laddr && !equal(rp->rcb_laddr, dst))
95			continue;
96		if (rp->rcb_faddr && !equal(rp->rcb_faddr, src))
97			continue;
98		if (last) {
99			struct mbuf *n;
100			n = m_copy(m, 0, (int)M_COPYALL);
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*/
124void
125raw_ctlinput(int cmd, struct sockaddr *arg, void *dummy)
126{
127
128	if (cmd < 0 || cmd >= PRC_NCMDS)
129		return;
130	/* INCOMPLETE */
131}
132
133static void
134raw_uabort(struct socket *so)
135{
136	struct rawcb *rp = sotorawcb(so);
137
138	KASSERT(rp != NULL, ("raw_uabort: rp == NULL"));
139	raw_disconnect(rp);
140	soisdisconnected(so);
141}
142
143static void
144raw_uclose(struct socket *so)
145{
146	struct rawcb *rp = sotorawcb(so);
147
148	KASSERT(rp != NULL, ("raw_uabort: rp == NULL"));
149	raw_disconnect(rp);
150	soisdisconnected(so);
151}
152
153/* pru_accept is EOPNOTSUPP */
154
155static int
156raw_uattach(struct socket *so, int proto, struct thread *td)
157{
158	int error;
159
160	/*
161	 * Implementors of raw sockets will already have allocated the PCB,
162	 *  so it must be non-NULL here.
163	 */
164	KASSERT(sotorawcb(so) != NULL, ("raw_uattach: so_pcb == NULL"));
165
166	if (td != NULL) {
167		error = priv_check(td, PRIV_NET_RAW);
168		if (error)
169			return error;
170	}
171	return raw_attach(so, proto);
172}
173
174static int
175raw_ubind(struct socket *so, struct sockaddr *nam, struct thread *td)
176{
177
178	return (EINVAL);
179}
180
181static int
182raw_uconnect(struct socket *so, struct sockaddr *nam, struct thread *td)
183{
184
185	return (EINVAL);
186}
187
188/* pru_connect2 is EOPNOTSUPP */
189/* pru_control is EOPNOTSUPP */
190
191static void
192raw_udetach(struct socket *so)
193{
194	struct rawcb *rp = sotorawcb(so);
195
196	KASSERT(rp != NULL, ("raw_udetach: rp == NULL"));
197	raw_detach(rp);
198}
199
200static int
201raw_udisconnect(struct socket *so)
202{
203	struct rawcb *rp = sotorawcb(so);
204
205	KASSERT(rp != NULL, ("raw_udisconnect: rp == NULL"));
206	if (rp->rcb_faddr == 0)
207		return (ENOTCONN);
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	KASSERT(rp != NULL, ("raw_upeeraddr: rp == NULL"));
221	if (rp->rcb_faddr == 0)
222		return (ENOTCONN);
223	*nam = sodupsockaddr(rp->rcb_faddr, M_WAITOK);
224	return (0);
225}
226
227/* pru_rcvd is EOPNOTSUPP */
228/* pru_rcvoob is EOPNOTSUPP */
229
230static int
231raw_usend(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
232    struct mbuf *control, struct thread *td)
233{
234	int error;
235	struct rawcb *rp = sotorawcb(so);
236
237	KASSERT(rp != NULL, ("raw_usend: rp == NULL"));
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
274	KASSERT(sotorawcb(so) != NULL, ("raw_ushutdown: rp == NULL"));
275	socantsendmore(so);
276	return (0);
277}
278
279static int
280raw_usockaddr(struct socket *so, struct sockaddr **nam)
281{
282	struct rawcb *rp = sotorawcb(so);
283
284	KASSERT(rp != NULL, ("raw_usockaddr: rp == NULL"));
285	if (rp->rcb_laddr == 0)
286		return (EINVAL);
287	*nam = sodupsockaddr(rp->rcb_laddr, M_WAITOK);
288	return (0);
289}
290
291struct pr_usrreqs raw_usrreqs = {
292	.pru_abort =		raw_uabort,
293	.pru_attach =		raw_uattach,
294	.pru_bind =		raw_ubind,
295	.pru_connect =		raw_uconnect,
296	.pru_detach =		raw_udetach,
297	.pru_disconnect =	raw_udisconnect,
298	.pru_peeraddr =		raw_upeeraddr,
299	.pru_send =		raw_usend,
300	.pru_shutdown =		raw_ushutdown,
301	.pru_sockaddr =		raw_usockaddr,
302	.pru_close =		raw_uclose,
303};
304