1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1980, 1986, 1993
5 *	The Regents of the University of California.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 *	@(#)raw_usrreq.c	8.1 (Berkeley) 6/10/93
33 * $FreeBSD$
34 */
35
36#include <sys/param.h>
37#include <sys/kernel.h>
38#include <sys/lock.h>
39#include <sys/malloc.h>
40#include <sys/mbuf.h>
41#include <sys/mutex.h>
42#include <sys/priv.h>
43#include <sys/protosw.h>
44#include <sys/signalvar.h>
45#include <sys/socket.h>
46#include <sys/socketvar.h>
47#include <sys/sx.h>
48#include <sys/systm.h>
49
50#include <net/if.h>
51#include <net/vnet.h>
52#include <net/raw_cb.h>
53
54MTX_SYSINIT(rawcb_mtx, &rawcb_mtx, "rawcb", MTX_DEF);
55
56/*
57 * Initialize raw connection block q.
58 */
59void
60raw_init(void)
61{
62
63	LIST_INIT(&V_rawcb_list);
64}
65
66/*
67 * Raw protocol input routine.  Find the socket associated with the packet(s)
68 * and move them over.  If nothing exists for this packet, drop it.
69 */
70/*
71 * Raw protocol interface.
72 */
73void
74raw_input(struct mbuf *m0, struct sockproto *proto, struct sockaddr *src)
75{
76
77	return (raw_input_ext(m0, proto, src, NULL));
78}
79
80void
81raw_input_ext(struct mbuf *m0, struct sockproto *proto, struct sockaddr *src,
82    raw_input_cb_fn cb)
83{
84	struct rawcb *rp;
85	struct mbuf *m = m0;
86	struct socket *last;
87
88	last = NULL;
89	mtx_lock(&rawcb_mtx);
90	LIST_FOREACH(rp, &V_rawcb_list, list) {
91		if (rp->rcb_proto.sp_family != proto->sp_family)
92			continue;
93		if (rp->rcb_proto.sp_protocol  &&
94		    rp->rcb_proto.sp_protocol != proto->sp_protocol)
95			continue;
96		if (cb != NULL && (*cb)(m, proto, src, rp) != 0)
97			continue;
98		if (last) {
99			struct mbuf *n;
100			n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
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
137	KASSERT(sotorawcb(so) != NULL, ("raw_uabort: rp == NULL"));
138
139	soisdisconnected(so);
140}
141
142static void
143raw_uclose(struct socket *so)
144{
145
146	KASSERT(sotorawcb(so) != NULL, ("raw_uabort: rp == NULL"));
147
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	int error;
157
158	/*
159	 * Implementors of raw sockets will already have allocated the PCB,
160	 * so it must be non-NULL here.
161	 */
162	KASSERT(sotorawcb(so) != NULL, ("raw_uattach: so_pcb == NULL"));
163
164	if (td != NULL) {
165		error = priv_check(td, PRIV_NET_RAW);
166		if (error)
167			return (error);
168	}
169	return (raw_attach(so, proto));
170}
171
172static int
173raw_ubind(struct socket *so, struct sockaddr *nam, struct thread *td)
174{
175
176	return (EINVAL);
177}
178
179static int
180raw_uconnect(struct socket *so, struct sockaddr *nam, struct thread *td)
181{
182
183	return (EINVAL);
184}
185
186/* pru_connect2 is EOPNOTSUPP */
187/* pru_control is EOPNOTSUPP */
188
189static void
190raw_udetach(struct socket *so)
191{
192	struct rawcb *rp = sotorawcb(so);
193
194	KASSERT(rp != NULL, ("raw_udetach: rp == NULL"));
195
196	raw_detach(rp);
197}
198
199static int
200raw_udisconnect(struct socket *so)
201{
202
203	KASSERT(sotorawcb(so) != NULL, ("raw_udisconnect: rp == NULL"));
204
205	return (ENOTCONN);
206}
207
208/* pru_listen is EOPNOTSUPP */
209
210static int
211raw_upeeraddr(struct socket *so, struct sockaddr **nam)
212{
213
214	KASSERT(sotorawcb(so) != NULL, ("raw_upeeraddr: rp == NULL"));
215
216	return (ENOTCONN);
217}
218
219/* pru_rcvd is EOPNOTSUPP */
220/* pru_rcvoob is EOPNOTSUPP */
221
222static int
223raw_usend(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
224    struct mbuf *control, struct thread *td)
225{
226
227	KASSERT(sotorawcb(so) != NULL, ("raw_usend: rp == NULL"));
228
229	if ((flags & PRUS_OOB) || (control && control->m_len)) {
230		if (m != NULL)
231			m_freem(m);
232		if (control != NULL)
233			m_freem(control);
234		return (EOPNOTSUPP);
235	}
236
237	/*
238	 * For historical (bad?) reasons, we effectively ignore the address
239	 * argument to sendto(2).  Perhaps we should return an error instead?
240	 */
241	return ((*so->so_proto->pr_output)(m, so));
242}
243
244/* pru_sense is null */
245
246static int
247raw_ushutdown(struct socket *so)
248{
249
250	KASSERT(sotorawcb(so) != NULL, ("raw_ushutdown: rp == NULL"));
251
252	socantsendmore(so);
253	return (0);
254}
255
256static int
257raw_usockaddr(struct socket *so, struct sockaddr **nam)
258{
259
260	KASSERT(sotorawcb(so) != NULL, ("raw_usockaddr: rp == NULL"));
261
262	return (EINVAL);
263}
264
265struct pr_usrreqs raw_usrreqs = {
266	.pru_abort =		raw_uabort,
267	.pru_attach =		raw_uattach,
268	.pru_bind =		raw_ubind,
269	.pru_connect =		raw_uconnect,
270	.pru_detach =		raw_udetach,
271	.pru_disconnect =	raw_udisconnect,
272	.pru_peeraddr =		raw_upeeraddr,
273	.pru_send =		raw_usend,
274	.pru_shutdown =		raw_ushutdown,
275	.pru_sockaddr =		raw_usockaddr,
276	.pru_close =		raw_uclose,
277};
278