FreeBSD/Linux Kernel Cross Reference
sys/netinet/raw_ip.c
1 /*
2 * Copyright (c) 1982, 1986, 1988, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)raw_ip.c 8.7 (Berkeley) 5/15/95
34 * $FreeBSD: src/sys/netinet/raw_ip.c,v 1.37.2.7 1999/09/05 08:18:36 peter Exp $
35 */
36
37 #include <sys/param.h>
38 #include <sys/queue.h>
39 #include <sys/malloc.h>
40 #include <sys/mbuf.h>
41 #include <sys/socket.h>
42 #include <sys/protosw.h>
43 #include <sys/socketvar.h>
44 #include <sys/errno.h>
45 #include <sys/systm.h>
46
47 #include <net/if.h>
48 #include <net/route.h>
49
50 #define _IP_VHL
51 #include <netinet/in.h>
52 #include <netinet/in_systm.h>
53 #include <netinet/ip.h>
54 #include <netinet/in_pcb.h>
55 #include <netinet/in_var.h>
56 #include <netinet/ip_var.h>
57 #include <netinet/ip_mroute.h>
58
59 #include <netinet/ip_fw.h>
60
61 #if !defined(COMPAT_IPFW) || COMPAT_IPFW == 1
62 #undef COMPAT_IPFW
63 #define COMPAT_IPFW 1
64 #else
65 #undef COMPAT_IPFW
66 #endif
67
68 static struct inpcbhead ripcb;
69 static struct inpcbinfo ripcbinfo;
70
71 /*
72 * Nominal space allocated to a raw ip socket.
73 */
74 #define RIPSNDQ 8192
75 #define RIPRCVQ 8192
76
77 /*
78 * Raw interface to IP protocol.
79 */
80
81 /*
82 * Initialize raw connection block q.
83 */
84 void
85 rip_init()
86 {
87 LIST_INIT(&ripcb);
88 ripcbinfo.listhead = &ripcb;
89 /*
90 * XXX We don't use the hash list for raw IP, but it's easier
91 * to allocate a one entry hash list than it is to check all
92 * over the place for hashbase == NULL.
93 */
94 ripcbinfo.hashbase = hashinit(1, M_PCB, &ripcbinfo.hashmask);
95 }
96
97 static struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET };
98 /*
99 * Setup generic address and protocol structures
100 * for raw_input routine, then pass them along with
101 * mbuf chain.
102 */
103 void
104 rip_input(m, iphlen)
105 struct mbuf *m;
106 int iphlen;
107 {
108 register struct ip *ip = mtod(m, struct ip *);
109 register struct inpcb *inp;
110 struct inpcb *last = 0;
111 struct mbuf *opts = 0;
112
113 ripsrc.sin_addr = ip->ip_src;
114 for (inp = ripcb.lh_first; inp != NULL; inp = inp->inp_list.le_next) {
115 if (inp->inp_ip_p && inp->inp_ip_p != ip->ip_p)
116 continue;
117 if (inp->inp_laddr.s_addr &&
118 inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
119 continue;
120 if (inp->inp_faddr.s_addr &&
121 inp->inp_faddr.s_addr != ip->ip_src.s_addr)
122 continue;
123 if (last) {
124 struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
125 if (n) {
126 if (last->inp_flags & INP_CONTROLOPTS ||
127 last->inp_socket->so_options & SO_TIMESTAMP)
128 ip_savecontrol(last, &opts, ip, n);
129 if (sbappendaddr(&last->inp_socket->so_rcv,
130 (struct sockaddr *)&ripsrc, n,
131 opts) == 0) {
132 /* should notify about lost packet */
133 m_freem(n);
134 if (opts)
135 m_freem(opts);
136 } else
137 sorwakeup(last->inp_socket);
138 opts = 0;
139 }
140 }
141 last = inp;
142 }
143 if (last) {
144 if (last->inp_flags & INP_CONTROLOPTS ||
145 last->inp_socket->so_options & SO_TIMESTAMP)
146 ip_savecontrol(last, &opts, ip, m);
147 if (sbappendaddr(&last->inp_socket->so_rcv,
148 (struct sockaddr *)&ripsrc, m, opts) == 0) {
149 m_freem(m);
150 if (opts)
151 m_freem(opts);
152 } else
153 sorwakeup(last->inp_socket);
154 } else {
155 m_freem(m);
156 ipstat.ips_noproto++;
157 ipstat.ips_delivered--;
158 }
159 }
160
161 /*
162 * Generate IP header and pass packet to ip_output.
163 * Tack on options user may have setup with control call.
164 */
165 int
166 rip_output(m, so, dst)
167 register struct mbuf *m;
168 struct socket *so;
169 u_long dst;
170 {
171 register struct ip *ip;
172 register struct inpcb *inp = sotoinpcb(so);
173 int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST;
174
175 /*
176 * If the user handed us a complete IP packet, use it.
177 * Otherwise, allocate an mbuf for a header and fill it in.
178 */
179 if ((inp->inp_flags & INP_HDRINCL) == 0) {
180 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) {
181 m_freem(m);
182 return(EMSGSIZE);
183 }
184 M_PREPEND(m, sizeof(struct ip), M_WAIT);
185 ip = mtod(m, struct ip *);
186 ip->ip_tos = 0;
187 ip->ip_off = 0;
188 ip->ip_p = inp->inp_ip_p;
189 ip->ip_len = m->m_pkthdr.len;
190 ip->ip_src = inp->inp_laddr;
191 ip->ip_dst.s_addr = dst;
192 ip->ip_ttl = MAXTTL;
193 } else {
194 if (m->m_pkthdr.len > IP_MAXPACKET) {
195 m_freem(m);
196 return(EMSGSIZE);
197 }
198 ip = mtod(m, struct ip *);
199 /* don't allow both user specified and setsockopt options,
200 and don't allow packet length sizes that will crash */
201 if (((IP_VHL_HL(ip->ip_vhl) != (sizeof (*ip) >> 2))
202 && inp->inp_options)
203 || (ip->ip_len > m->m_pkthdr.len)
204 || (ip->ip_len < (IP_VHL_HL(ip->ip_vhl) << 2))) {
205 m_freem(m);
206 return EINVAL;
207 }
208 if (ip->ip_id == 0)
209 ip->ip_id = htons(ip_id++);
210 /* XXX prevent ip_output from overwriting header fields */
211 flags |= IP_RAWOUTPUT;
212 ipstat.ips_rawout++;
213 }
214 return (ip_output(m, inp->inp_options, &inp->inp_route, flags,
215 inp->inp_moptions));
216 }
217
218 /*
219 * Raw IP socket option processing.
220 */
221 int
222 rip_ctloutput(op, so, level, optname, m)
223 int op;
224 struct socket *so;
225 int level, optname;
226 struct mbuf **m;
227 {
228 register struct inpcb *inp = sotoinpcb(so);
229 register int error;
230
231 if (level != IPPROTO_IP) {
232 if (op == PRCO_SETOPT && *m)
233 (void)m_free(*m);
234 return (EINVAL);
235 }
236
237 switch (optname) {
238
239 case IP_HDRINCL:
240 error = 0;
241 if (op == PRCO_SETOPT) {
242 if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int))
243 error = EINVAL;
244 else if (*mtod(*m, int *))
245 inp->inp_flags |= INP_HDRINCL;
246 else
247 inp->inp_flags &= ~INP_HDRINCL;
248 if (*m)
249 (void)m_free(*m);
250 } else {
251 *m = m_get(M_WAIT, MT_SOOPTS);
252 (*m)->m_len = sizeof (int);
253 *mtod(*m, int *) = inp->inp_flags & INP_HDRINCL;
254 }
255 return (error);
256
257 #ifdef COMPAT_IPFW
258 case IP_FW_GET:
259 if (ip_fw_ctl_ptr == NULL || op == PRCO_SETOPT) {
260 if (*m) (void)m_free(*m);
261 return(EINVAL);
262 }
263 return (*ip_fw_ctl_ptr)(optname, m);
264
265 case IP_FW_ADD:
266 case IP_FW_DEL:
267 case IP_FW_FLUSH:
268 case IP_FW_ZERO:
269 if (ip_fw_ctl_ptr == NULL || op != PRCO_SETOPT) {
270 if (*m) (void)m_free(*m);
271 return(EINVAL);
272 }
273 return (*ip_fw_ctl_ptr)(optname, m);
274
275 case IP_NAT:
276 if (ip_nat_ctl_ptr == NULL) {
277 if (*m) (void)m_free(*m);
278 return(EINVAL);
279 }
280 return (*ip_nat_ctl_ptr)(op, m);
281
282 #endif
283 #ifdef DUMMYNET
284 case IP_DUMMYNET_GET:
285 if (ip_dn_ctl_ptr == NULL || op == PRCO_SETOPT) {
286 if (*m) (void)m_free(*m);
287 return(EINVAL);
288 }
289 return (*ip_dn_ctl_ptr)(optname, m);
290
291 case IP_DUMMYNET_CONFIGURE:
292 case IP_DUMMYNET_DEL:
293 case IP_DUMMYNET_FLUSH:
294 if (ip_dn_ctl_ptr == NULL || op != PRCO_SETOPT) {
295 if (*m) (void)m_free(*m);
296 return(EINVAL);
297 }
298 return (*ip_dn_ctl_ptr)(optname, m);
299 #endif
300 case IP_RSVP_ON:
301 return ip_rsvp_init(so);
302 break;
303
304 case IP_RSVP_OFF:
305 return ip_rsvp_done();
306 break;
307
308 case IP_RSVP_VIF_ON:
309 return ip_rsvp_vif_init(so, *m);
310
311 case IP_RSVP_VIF_OFF:
312 return ip_rsvp_vif_done(so, *m);
313
314 case MRT_INIT:
315 case MRT_DONE:
316 case MRT_ADD_VIF:
317 case MRT_DEL_VIF:
318 case MRT_ADD_MFC:
319 case MRT_DEL_MFC:
320 case MRT_VERSION:
321 case MRT_ASSERT:
322 if (op == PRCO_SETOPT) {
323 error = ip_mrouter_set(optname, so, *m);
324 if (*m)
325 (void)m_free(*m);
326 } else if (op == PRCO_GETOPT) {
327 error = ip_mrouter_get(optname, so, m);
328 } else
329 error = EINVAL;
330 return (error);
331 }
332 return (ip_ctloutput(op, so, level, optname, m));
333 }
334
335 static u_long rip_sendspace = RIPSNDQ; /* XXX sysctl ? */
336 static u_long rip_recvspace = RIPRCVQ; /* XXX sysctl ? */
337
338 /*ARGSUSED*/
339 int
340 rip_usrreq(so, req, m, nam, control)
341 register struct socket *so;
342 int req;
343 struct mbuf *m, *nam, *control;
344 {
345 register int error = 0;
346 register struct inpcb *inp = sotoinpcb(so);
347 int s;
348
349 if (req == PRU_CONTROL)
350 return (in_control(so, (u_long)m, (caddr_t)nam,
351 (struct ifnet *)control));
352
353 switch (req) {
354
355 case PRU_ATTACH:
356 if (inp)
357 panic("rip_attach");
358 if ((so->so_state & SS_PRIV) == 0) {
359 error = EACCES;
360 break;
361 }
362 s = splnet();
363 error = in_pcballoc(so, &ripcbinfo);
364 splx(s);
365 if (error)
366 break;
367 error = soreserve(so, rip_sendspace, rip_recvspace);
368 if (error)
369 break;
370 inp = (struct inpcb *)so->so_pcb;
371 inp->inp_ip_p = (int)nam;
372 break;
373
374 case PRU_DISCONNECT:
375 if ((so->so_state & SS_ISCONNECTED) == 0) {
376 error = ENOTCONN;
377 break;
378 }
379 /* FALLTHROUGH */
380 case PRU_ABORT:
381 soisdisconnected(so);
382 /* FALLTHROUGH */
383 case PRU_DETACH:
384 if (inp == 0)
385 panic("rip_detach");
386 if (so == ip_mrouter)
387 ip_mrouter_done();
388 ip_rsvp_force_done(so);
389 if (so == ip_rsvpd)
390 ip_rsvp_done();
391 in_pcbdetach(inp);
392 break;
393
394 case PRU_BIND:
395 {
396 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
397
398 if (nam->m_len != sizeof(*addr)) {
399 error = EINVAL;
400 break;
401 }
402 if ((ifnet == 0) ||
403 ((addr->sin_family != AF_INET) &&
404 (addr->sin_family != AF_IMPLINK)) ||
405 (addr->sin_addr.s_addr &&
406 ifa_ifwithaddr((struct sockaddr *)addr) == 0)) {
407 error = EADDRNOTAVAIL;
408 break;
409 }
410 inp->inp_laddr = addr->sin_addr;
411 break;
412 }
413 case PRU_CONNECT:
414 {
415 struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *);
416
417 if (nam->m_len != sizeof(*addr)) {
418 error = EINVAL;
419 break;
420 }
421 if (ifnet == 0) {
422 error = EADDRNOTAVAIL;
423 break;
424 }
425 if ((addr->sin_family != AF_INET) &&
426 (addr->sin_family != AF_IMPLINK)) {
427 error = EAFNOSUPPORT;
428 break;
429 }
430 inp->inp_faddr = addr->sin_addr;
431 soisconnected(so);
432 break;
433 }
434
435 case PRU_CONNECT2:
436 error = EOPNOTSUPP;
437 break;
438
439 /*
440 * Mark the connection as being incapable of further input.
441 */
442 case PRU_SHUTDOWN:
443 socantsendmore(so);
444 break;
445
446 /*
447 * Ship a packet out. The appropriate raw output
448 * routine handles any massaging necessary.
449 */
450 case PRU_SEND:
451 {
452 register u_long dst;
453
454 if (so->so_state & SS_ISCONNECTED) {
455 if (nam) {
456 error = EISCONN;
457 break;
458 }
459 dst = inp->inp_faddr.s_addr;
460 } else {
461 if (nam == NULL) {
462 error = ENOTCONN;
463 break;
464 }
465 dst = mtod(nam, struct sockaddr_in *)->sin_addr.s_addr;
466 }
467 error = rip_output(m, so, dst);
468 m = NULL;
469 break;
470 }
471
472 case PRU_SENSE:
473 /*
474 * stat: don't bother with a blocksize.
475 */
476 return (0);
477
478 /*
479 * Not supported.
480 */
481 case PRU_RCVOOB:
482 case PRU_RCVD:
483 case PRU_LISTEN:
484 case PRU_ACCEPT:
485 case PRU_SENDOOB:
486 error = EOPNOTSUPP;
487 break;
488
489 case PRU_SOCKADDR:
490 in_setsockaddr(inp, nam);
491 break;
492
493 case PRU_PEERADDR:
494 in_setpeeraddr(inp, nam);
495 break;
496
497 default:
498 panic("rip_usrreq");
499 }
500 if (m != NULL)
501 m_freem(m);
502 return (error);
503 }
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