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 * $FreeBSD$
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/if.h>
49#include <net/raw_cb.h>
50#include <net/vnet.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
61	LIST_INIT(&V_rawcb_list);
62}
63
64/*
65 * Raw protocol input routine.  Find the socket associated with the packet(s)
66 * and move them over.  If nothing exists for this packet, drop it.
67 */
68/*
69 * Raw protocol interface.
70 */
71void
72raw_input(struct mbuf *m0, struct sockproto *proto, struct sockaddr *src)
73{
74
75	return (raw_input_ext(m0, proto, src, NULL));
76}
77
78void
79raw_input_ext(struct mbuf *m0, struct sockproto *proto, struct sockaddr *src,
80    raw_input_cb_fn cb)
81{
82	struct rawcb *rp;
83	struct mbuf *m = m0;
84	struct socket *last;
85
86	last = 0;
87	mtx_lock(&rawcb_mtx);
88	LIST_FOREACH(rp, &V_rawcb_list, list) {
89		if (rp->rcb_proto.sp_family != proto->sp_family)
90			continue;
91		if (rp->rcb_proto.sp_protocol  &&
92		    rp->rcb_proto.sp_protocol != proto->sp_protocol)
93			continue;
94		if (cb != NULL && (*cb)(m, proto, src, rp) != 0)
95			continue;
96		if (last) {
97			struct mbuf *n;
98			n = m_copy(m, 0, (int)M_COPYALL);
99			if (n) {
100				if (sbappendaddr(&last->so_rcv, src,
101				    n, (struct mbuf *)0) == 0)
102					/* should notify about lost packet */
103					m_freem(n);
104				else
105					sorwakeup(last);
106			}
107		}
108		last = rp->rcb_socket;
109	}
110	if (last) {
111		if (sbappendaddr(&last->so_rcv, src,
112		    m, (struct mbuf *)0) == 0)
113			m_freem(m);
114		else
115			sorwakeup(last);
116	} else
117		m_freem(m);
118	mtx_unlock(&rawcb_mtx);
119}
120
121/*ARGSUSED*/
122void
123raw_ctlinput(int cmd, struct sockaddr *arg, void *dummy)
124{
125
126	if (cmd < 0 || cmd >= PRC_NCMDS)
127		return;
128	/* INCOMPLETE */
129}
130
131static void
132raw_uabort(struct socket *so)
133{
134
135	KASSERT(sotorawcb(so) != NULL, ("raw_uabort: rp == NULL"));
136
137	soisdisconnected(so);
138}
139
140static void
141raw_uclose(struct socket *so)
142{
143
144	KASSERT(sotorawcb(so) != NULL, ("raw_uabort: rp == NULL"));
145
146	soisdisconnected(so);
147}
148
149/* pru_accept is EOPNOTSUPP */
150
151static int
152raw_uattach(struct socket *so, int proto, struct thread *td)
153{
154	int error;
155
156	/*
157	 * Implementors of raw sockets will already have allocated the PCB,
158	 * so it must be non-NULL here.
159	 */
160	KASSERT(sotorawcb(so) != NULL, ("raw_uattach: so_pcb == NULL"));
161
162	if (td != NULL) {
163		error = priv_check(td, PRIV_NET_RAW);
164		if (error)
165			return (error);
166	}
167	return (raw_attach(so, proto));
168}
169
170static int
171raw_ubind(struct socket *so, struct sockaddr *nam, struct thread *td)
172{
173
174	return (EINVAL);
175}
176
177static int
178raw_uconnect(struct socket *so, struct sockaddr *nam, struct thread *td)
179{
180
181	return (EINVAL);
182}
183
184/* pru_connect2 is EOPNOTSUPP */
185/* pru_control is EOPNOTSUPP */
186
187static void
188raw_udetach(struct socket *so)
189{
190	struct rawcb *rp = sotorawcb(so);
191
192	KASSERT(rp != NULL, ("raw_udetach: rp == NULL"));
193
194	raw_detach(rp);
195}
196
197static int
198raw_udisconnect(struct socket *so)
199{
200
201	KASSERT(sotorawcb(so) != NULL, ("raw_udisconnect: rp == NULL"));
202
203	return (ENOTCONN);
204}
205
206/* pru_listen is EOPNOTSUPP */
207
208static int
209raw_upeeraddr(struct socket *so, struct sockaddr **nam)
210{
211
212	KASSERT(sotorawcb(so) != NULL, ("raw_upeeraddr: rp == NULL"));
213
214	return (ENOTCONN);
215}
216
217/* pru_rcvd is EOPNOTSUPP */
218/* pru_rcvoob is EOPNOTSUPP */
219
220static int
221raw_usend(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
222    struct mbuf *control, struct thread *td)
223{
224
225	KASSERT(sotorawcb(so) != NULL, ("raw_usend: rp == NULL"));
226
227	if ((flags & PRUS_OOB) || (control && control->m_len)) {
228		/* XXXRW: Should control also be freed here? */
229		if (m != NULL)
230			m_freem(m);
231		return (EOPNOTSUPP);
232	}
233
234	/*
235	 * For historical (bad?) reasons, we effectively ignore the address
236	 * argument to sendto(2).  Perhaps we should return an error instead?
237	 */
238	return ((*so->so_proto->pr_output)(m, so));
239}
240
241/* pru_sense is null */
242
243static int
244raw_ushutdown(struct socket *so)
245{
246
247	KASSERT(sotorawcb(so) != NULL, ("raw_ushutdown: rp == NULL"));
248
249	socantsendmore(so);
250	return (0);
251}
252
253static int
254raw_usockaddr(struct socket *so, struct sockaddr **nam)
255{
256
257	KASSERT(sotorawcb(so) != NULL, ("raw_usockaddr: rp == NULL"));
258
259	return (EINVAL);
260}
261
262struct pr_usrreqs raw_usrreqs = {
263	.pru_abort =		raw_uabort,
264	.pru_attach =		raw_uattach,
265	.pru_bind =		raw_ubind,
266	.pru_connect =		raw_uconnect,
267	.pru_detach =		raw_udetach,
268	.pru_disconnect =	raw_udisconnect,
269	.pru_peeraddr =		raw_upeeraddr,
270	.pru_send =		raw_usend,
271	.pru_shutdown =		raw_ushutdown,
272	.pru_sockaddr =		raw_usockaddr,
273	.pru_close =		raw_uclose,
274};
275