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:

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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>

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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);

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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}

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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};