raw_usrreq.c revision 183550 
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 183550 2008-10-02 15:37:58Z zec $
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#include <sys/vimage.h>
48
49#include <net/if.h>
50#include <net/raw_cb.h>
51
52MTX_SYSINIT(rawcb_mtx, &rawcb_mtx, "rawcb", MTX_DEF);
53
54/*
55 * Initialize raw connection block q.
56 */
57void
58raw_init(void)
59{
60	INIT_VNET_NET(curvnet);
61
62	LIST_INIT(&V_rawcb_list);
63}
64
65/*
66 * Raw protocol input routine.  Find the socket associated with the packet(s)
67 * and move them over.  If nothing exists for this packet, drop it.
68 */
69/*
70 * Raw protocol interface.
71 */
72void
73raw_input(struct mbuf *m0, struct sockproto *proto, struct sockaddr *src)
74{
75	INIT_VNET_NET(curvnet);
76	struct rawcb *rp;
77	struct mbuf *m = m0;
78	struct socket *last;
79
80	last = 0;
81	mtx_lock(&rawcb_mtx);
82	LIST_FOREACH(rp, &V_rawcb_list, list) {
83		if (rp->rcb_proto.sp_family != proto->sp_family)
84			continue;
85		if (rp->rcb_proto.sp_protocol  &&
86		    rp->rcb_proto.sp_protocol != proto->sp_protocol)
87			continue;
88		if (last) {
89			struct mbuf *n;
90			n = m_copy(m, 0, (int)M_COPYALL);
91			if (n) {
92				if (sbappendaddr(&last->so_rcv, src,
93				    n, (struct mbuf *)0) == 0)
94					/* should notify about lost packet */
95					m_freem(n);
96				else
97					sorwakeup(last);
98			}
99		}
100		last = rp->rcb_socket;
101	}
102	if (last) {
103		if (sbappendaddr(&last->so_rcv, src,
104		    m, (struct mbuf *)0) == 0)
105			m_freem(m);
106		else
107			sorwakeup(last);
108	} else
109		m_freem(m);
110	mtx_unlock(&rawcb_mtx);
111}
112
113/*ARGSUSED*/
114void
115raw_ctlinput(int cmd, struct sockaddr *arg, void *dummy)
116{
117
118	if (cmd < 0 || cmd >= PRC_NCMDS)
119		return;
120	/* INCOMPLETE */
121}
122
123static void
124raw_uabort(struct socket *so)
125{
126
127	KASSERT(sotorawcb(so) != NULL, ("raw_uabort: rp == NULL"));
128
129	soisdisconnected(so);
130}
131
132static void
133raw_uclose(struct socket *so)
134{
135
136	KASSERT(sotorawcb(so) != NULL, ("raw_uabort: rp == NULL"));
137
138	soisdisconnected(so);
139}
140
141/* pru_accept is EOPNOTSUPP */
142
143static int
144raw_uattach(struct socket *so, int proto, struct thread *td)
145{
146	int error;
147
148	/*
149	 * Implementors of raw sockets will already have allocated the PCB,
150	 * so it must be non-NULL here.
151	 */
152	KASSERT(sotorawcb(so) != NULL, ("raw_uattach: so_pcb == NULL"));
153
154	if (td != NULL) {
155		error = priv_check(td, PRIV_NET_RAW);
156		if (error)
157			return (error);
158	}
159	return (raw_attach(so, proto));
160}
161
162static int
163raw_ubind(struct socket *so, struct sockaddr *nam, struct thread *td)
164{
165
166	return (EINVAL);
167}
168
169static int
170raw_uconnect(struct socket *so, struct sockaddr *nam, struct thread *td)
171{
172
173	return (EINVAL);
174}
175
176/* pru_connect2 is EOPNOTSUPP */
177/* pru_control is EOPNOTSUPP */
178
179static void
180raw_udetach(struct socket *so)
181{
182	struct rawcb *rp = sotorawcb(so);
183
184	KASSERT(rp != NULL, ("raw_udetach: rp == NULL"));
185
186	raw_detach(rp);
187}
188
189static int
190raw_udisconnect(struct socket *so)
191{
192
193	KASSERT(sotorawcb(so) != NULL, ("raw_udisconnect: rp == NULL"));
194
195	return (ENOTCONN);
196}
197
198/* pru_listen is EOPNOTSUPP */
199
200static int
201raw_upeeraddr(struct socket *so, struct sockaddr **nam)
202{
203
204	KASSERT(sotorawcb(so) != NULL, ("raw_upeeraddr: rp == NULL"));
205
206	return (ENOTCONN);
207}
208
209/* pru_rcvd is EOPNOTSUPP */
210/* pru_rcvoob is EOPNOTSUPP */
211
212static int
213raw_usend(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
214    struct mbuf *control, struct thread *td)
215{
216
217	KASSERT(sotorawcb(so) != NULL, ("raw_usend: rp == NULL"));
218
219	if ((flags & PRUS_OOB) || (control && control->m_len)) {
220		/* XXXRW: Should control also be freed here? */
221		if (m != NULL)
222			m_freem(m);
223		return (EOPNOTSUPP);
224	}
225
226	/*
227	 * For historical (bad?) reasons, we effectively ignore the address
228	 * argument to sendto(2).  Perhaps we should return an error instead?
229	 */
230	return ((*so->so_proto->pr_output)(m, so));
231}
232
233/* pru_sense is null */
234
235static int
236raw_ushutdown(struct socket *so)
237{
238
239	KASSERT(sotorawcb(so) != NULL, ("raw_ushutdown: rp == NULL"));
240
241	socantsendmore(so);
242	return (0);
243}
244
245static int
246raw_usockaddr(struct socket *so, struct sockaddr **nam)
247{
248
249	KASSERT(sotorawcb(so) != NULL, ("raw_usockaddr: rp == NULL"));
250
251	return (EINVAL);
252}
253
254struct pr_usrreqs raw_usrreqs = {
255	.pru_abort =		raw_uabort,
256	.pru_attach =		raw_uattach,
257	.pru_bind =		raw_ubind,
258	.pru_connect =		raw_uconnect,
259	.pru_detach =		raw_udetach,
260	.pru_disconnect =	raw_udisconnect,
261	.pru_peeraddr =		raw_upeeraddr,
262	.pru_send =		raw_usend,
263	.pru_shutdown =		raw_ushutdown,
264	.pru_sockaddr =		raw_usockaddr,
265	.pru_close =		raw_uclose,
266};
267