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 | * 4. Neither the name of the University nor the names of its contributors |
---|
14 | * may be used to endorse or promote products derived from this software |
---|
15 | * without specific prior written permission. |
---|
16 | * |
---|
17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
---|
18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
---|
19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
---|
20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
---|
21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
---|
22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
---|
23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
---|
24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
---|
25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
---|
26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
---|
27 | * SUCH DAMAGE. |
---|
28 | * |
---|
29 | * @(#)raw_ip.c 8.7 (Berkeley) 5/15/95 |
---|
30 | * $FreeBSD: src/sys/netinet/raw_ip.c,v 1.147 2005/01/07 01:45:45 imp Exp $ |
---|
31 | */ |
---|
32 | |
---|
33 | /* |
---|
34 | * $Id$ |
---|
35 | */ |
---|
36 | |
---|
37 | #include "opt_inet6.h" |
---|
38 | #include "opt_ipsec.h" |
---|
39 | #include "opt_mac.h" |
---|
40 | |
---|
41 | #include <sys/param.h> |
---|
42 | #include <sys/queue.h> |
---|
43 | #include <sys/malloc.h> |
---|
44 | #include <sys/mbuf.h> |
---|
45 | #include <sys/socket.h> |
---|
46 | #include <sys/protosw.h> |
---|
47 | #include <sys/socketvar.h> |
---|
48 | #include <sys/errno.h> |
---|
49 | #include <sys/systm.h> |
---|
50 | |
---|
51 | #include <net/if.h> |
---|
52 | #include <net/route.h> |
---|
53 | |
---|
54 | #define _IP_VHL |
---|
55 | #include <netinet/in.h> |
---|
56 | #include <netinet/in_systm.h> |
---|
57 | #include <netinet/in_pcb.h> |
---|
58 | #include <netinet/in_var.h> |
---|
59 | #include <netinet/ip.h> |
---|
60 | #include <netinet/ip_var.h> |
---|
61 | #include <netinet/ip_mroute.h> |
---|
62 | |
---|
63 | #include <netinet/ip_fw.h> |
---|
64 | |
---|
65 | #if !defined(COMPAT_IPFW) || COMPAT_IPFW == 1 |
---|
66 | #undef COMPAT_IPFW |
---|
67 | #define COMPAT_IPFW 1 |
---|
68 | #else |
---|
69 | #undef COMPAT_IPFW |
---|
70 | #endif |
---|
71 | |
---|
72 | static struct inpcbhead ripcb; |
---|
73 | static struct inpcbinfo ripcbinfo; |
---|
74 | |
---|
75 | /* |
---|
76 | * Nominal space allocated to a raw ip socket. |
---|
77 | */ |
---|
78 | #define RIPSNDQ 8192 |
---|
79 | #define RIPRCVQ 8192 |
---|
80 | |
---|
81 | /* |
---|
82 | * Raw interface to IP protocol. |
---|
83 | */ |
---|
84 | |
---|
85 | /* |
---|
86 | * Initialize raw connection block q. |
---|
87 | */ |
---|
88 | void |
---|
89 | rip_init() |
---|
90 | { |
---|
91 | LIST_INIT(&ripcb); |
---|
92 | ripcbinfo.listhead = &ripcb; |
---|
93 | /* |
---|
94 | * XXX We don't use the hash list for raw IP, but it's easier |
---|
95 | * to allocate a one entry hash list than it is to check all |
---|
96 | * over the place for hashbase == NULL. |
---|
97 | */ |
---|
98 | ripcbinfo.hashbase = hashinit(1, M_PCB, &ripcbinfo.hashmask); |
---|
99 | } |
---|
100 | |
---|
101 | static struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET }; |
---|
102 | /* |
---|
103 | * Setup generic address and protocol structures |
---|
104 | * for raw_input routine, then pass them along with |
---|
105 | * mbuf chain. |
---|
106 | */ |
---|
107 | void |
---|
108 | rip_input(struct mbuf *m, int iphlen) |
---|
109 | { |
---|
110 | struct ip *ip = mtod(m, struct ip *); |
---|
111 | register struct inpcb *inp; |
---|
112 | struct inpcb *last = 0; |
---|
113 | struct mbuf *opts = 0; |
---|
114 | |
---|
115 | ripsrc.sin_addr = ip->ip_src; |
---|
116 | for (inp = ripcb.lh_first; inp != NULL; inp = inp->inp_list.le_next) { |
---|
117 | if (inp->inp_ip_p && inp->inp_ip_p != ip->ip_p) |
---|
118 | continue; |
---|
119 | if (inp->inp_laddr.s_addr && |
---|
120 | inp->inp_laddr.s_addr != ip->ip_dst.s_addr) |
---|
121 | continue; |
---|
122 | if (inp->inp_faddr.s_addr && |
---|
123 | inp->inp_faddr.s_addr != ip->ip_src.s_addr) |
---|
124 | continue; |
---|
125 | if (last) { |
---|
126 | struct mbuf *n = m_copy(m, 0, (int)M_COPYALL); |
---|
127 | if (n) { |
---|
128 | if (last->inp_flags & INP_CONTROLOPTS || |
---|
129 | last->inp_socket->so_options & SO_TIMESTAMP) |
---|
130 | ip_savecontrol(last, &opts, ip, n); |
---|
131 | if (sbappendaddr(&last->inp_socket->so_rcv, |
---|
132 | (struct sockaddr *)&ripsrc, n, |
---|
133 | opts) == 0) { |
---|
134 | /* should notify about lost packet */ |
---|
135 | m_freem(n); |
---|
136 | if (opts) |
---|
137 | m_freem(opts); |
---|
138 | } else |
---|
139 | sorwakeup(last->inp_socket); |
---|
140 | opts = 0; |
---|
141 | } |
---|
142 | } |
---|
143 | last = inp; |
---|
144 | } |
---|
145 | if (last) { |
---|
146 | if (last->inp_flags & INP_CONTROLOPTS || |
---|
147 | last->inp_socket->so_options & SO_TIMESTAMP) |
---|
148 | ip_savecontrol(last, &opts, ip, m); |
---|
149 | if (sbappendaddr(&last->inp_socket->so_rcv, |
---|
150 | (struct sockaddr *)&ripsrc, m, opts) == 0) { |
---|
151 | m_freem(m); |
---|
152 | if (opts) |
---|
153 | m_freem(opts); |
---|
154 | } else |
---|
155 | sorwakeup(last->inp_socket); |
---|
156 | } else { |
---|
157 | m_freem(m); |
---|
158 | ipstat.ips_noproto++; |
---|
159 | ipstat.ips_delivered--; |
---|
160 | } |
---|
161 | } |
---|
162 | |
---|
163 | /* |
---|
164 | * Generate IP header and pass packet to ip_output. |
---|
165 | * Tack on options user may have setup with control call. |
---|
166 | */ |
---|
167 | int |
---|
168 | rip_output(struct mbuf *m, struct socket *so, u_long dst) |
---|
169 | { |
---|
170 | struct ip *ip; |
---|
171 | struct inpcb *inp = sotoinpcb(so); |
---|
172 | int flags = ((so->so_options & SO_DONTROUTE) ? IP_ROUTETOIF : 0) | |
---|
173 | 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 | #ifdef _IP_VHL |
---|
202 | if (((IP_VHL_HL(ip->ip_vhl) != (sizeof (*ip) >> 2)) |
---|
203 | && inp->inp_options) |
---|
204 | || (ip->ip_len > m->m_pkthdr.len) |
---|
205 | || (ip->ip_len < (IP_VHL_HL(ip->ip_vhl) << 2))) { |
---|
206 | #else |
---|
207 | if (((ip->ip_hl != (sizeof (*ip) >> 2)) |
---|
208 | && inp->inp_options) |
---|
209 | || (ip->ip_len > m->m_pkthdr.len) |
---|
210 | || (ip->ip_len < (ip->ip_hl << 2))) { |
---|
211 | #endif |
---|
212 | m_freem(m); |
---|
213 | return EINVAL; |
---|
214 | } |
---|
215 | if (ip->ip_id == 0) |
---|
216 | ip->ip_id = htons(ip_id++); |
---|
217 | /* XXX prevent ip_output from overwriting header fields */ |
---|
218 | flags |= IP_RAWOUTPUT; |
---|
219 | ipstat.ips_rawout++; |
---|
220 | } |
---|
221 | return (ip_output(m, inp->inp_options, &inp->inp_route, flags, |
---|
222 | inp->inp_moptions)); |
---|
223 | } |
---|
224 | |
---|
225 | /* |
---|
226 | * Raw IP socket option processing. |
---|
227 | */ |
---|
228 | int |
---|
229 | rip_ctloutput(op, so, level, optname, m) |
---|
230 | int op; |
---|
231 | struct socket *so; |
---|
232 | int level, optname; |
---|
233 | struct mbuf **m; |
---|
234 | { |
---|
235 | struct inpcb *inp = sotoinpcb(so); |
---|
236 | int error; |
---|
237 | |
---|
238 | if (level != IPPROTO_IP) { |
---|
239 | if (op == PRCO_SETOPT && *m) |
---|
240 | (void)m_free(*m); |
---|
241 | return (EINVAL); |
---|
242 | } |
---|
243 | |
---|
244 | switch (optname) { |
---|
245 | |
---|
246 | case IP_HDRINCL: |
---|
247 | error = 0; |
---|
248 | if (op == PRCO_SETOPT) { |
---|
249 | if (m == 0 || *m == 0 || (*m)->m_len < sizeof (int)) |
---|
250 | error = EINVAL; |
---|
251 | else if (*mtod(*m, int *)) |
---|
252 | inp->inp_flags |= INP_HDRINCL; |
---|
253 | else |
---|
254 | inp->inp_flags &= ~INP_HDRINCL; |
---|
255 | if (*m) |
---|
256 | (void)m_free(*m); |
---|
257 | } else { |
---|
258 | *m = m_get(M_WAIT, MT_SOOPTS); |
---|
259 | (*m)->m_len = sizeof (int); |
---|
260 | *mtod(*m, int *) = inp->inp_flags & INP_HDRINCL; |
---|
261 | } |
---|
262 | return (error); |
---|
263 | |
---|
264 | #ifdef COMPAT_IPFW |
---|
265 | case IP_FW_GET: |
---|
266 | if (ip_fw_ctl_ptr == NULL || op == PRCO_SETOPT) { |
---|
267 | if (*m) (void)m_free(*m); |
---|
268 | return(EINVAL); |
---|
269 | } |
---|
270 | return (*ip_fw_ctl_ptr)(optname, m); |
---|
271 | |
---|
272 | case IP_FW_ADD: |
---|
273 | case IP_FW_DEL: |
---|
274 | case IP_FW_FLUSH: |
---|
275 | case IP_FW_ZERO: |
---|
276 | if (ip_fw_ctl_ptr == NULL || op != PRCO_SETOPT) { |
---|
277 | if (*m) (void)m_free(*m); |
---|
278 | return(EINVAL); |
---|
279 | } |
---|
280 | return (*ip_fw_ctl_ptr)(optname, m); |
---|
281 | |
---|
282 | case IP_NAT: |
---|
283 | if (ip_nat_ctl_ptr == NULL) { |
---|
284 | if (*m) (void)m_free(*m); |
---|
285 | return(EINVAL); |
---|
286 | } |
---|
287 | return (*ip_nat_ctl_ptr)(op, m); |
---|
288 | |
---|
289 | #endif |
---|
290 | case IP_RSVP_ON: |
---|
291 | return ip_rsvp_init(so); |
---|
292 | break; |
---|
293 | |
---|
294 | case IP_RSVP_OFF: |
---|
295 | return ip_rsvp_done(); |
---|
296 | break; |
---|
297 | |
---|
298 | case IP_RSVP_VIF_ON: |
---|
299 | return ip_rsvp_vif_init(so, *m); |
---|
300 | |
---|
301 | case IP_RSVP_VIF_OFF: |
---|
302 | return ip_rsvp_vif_done(so, *m); |
---|
303 | |
---|
304 | case MRT_INIT: |
---|
305 | case MRT_DONE: |
---|
306 | case MRT_ADD_VIF: |
---|
307 | case MRT_DEL_VIF: |
---|
308 | case MRT_ADD_MFC: |
---|
309 | case MRT_DEL_MFC: |
---|
310 | case MRT_VERSION: |
---|
311 | case MRT_ASSERT: |
---|
312 | if (op == PRCO_SETOPT) { |
---|
313 | error = ip_mrouter_set(optname, so, *m); |
---|
314 | if (*m) |
---|
315 | (void)m_free(*m); |
---|
316 | } else if (op == PRCO_GETOPT) { |
---|
317 | error = ip_mrouter_get(optname, so, m); |
---|
318 | } else |
---|
319 | error = EINVAL; |
---|
320 | return (error); |
---|
321 | } |
---|
322 | return (ip_ctloutput(op, so, level, optname, m)); |
---|
323 | } |
---|
324 | |
---|
325 | static u_long rip_sendspace = RIPSNDQ; /* XXX sysctl ? */ |
---|
326 | static u_long rip_recvspace = RIPRCVQ; /* XXX sysctl ? */ |
---|
327 | |
---|
328 | /*ARGSUSED*/ |
---|
329 | int |
---|
330 | rip_usrreq(so, req, m, nam, control) |
---|
331 | register struct socket *so; |
---|
332 | int req; |
---|
333 | struct mbuf *m, *nam, *control; |
---|
334 | { |
---|
335 | register int error = 0; |
---|
336 | register struct inpcb *inp = sotoinpcb(so); |
---|
337 | int s; |
---|
338 | |
---|
339 | if (req == PRU_CONTROL) |
---|
340 | return (in_control(so, (u_long)m, (caddr_t)nam, |
---|
341 | (struct ifnet *)control)); |
---|
342 | |
---|
343 | switch (req) { |
---|
344 | |
---|
345 | case PRU_ATTACH: |
---|
346 | if (inp) |
---|
347 | panic("rip_attach"); |
---|
348 | if ((so->so_state & SS_PRIV) == 0) { |
---|
349 | error = EACCES; |
---|
350 | break; |
---|
351 | } |
---|
352 | s = splnet(); |
---|
353 | error = in_pcballoc(so, &ripcbinfo); |
---|
354 | splx(s); |
---|
355 | if (error) |
---|
356 | break; |
---|
357 | error = soreserve(so, rip_sendspace, rip_recvspace); |
---|
358 | if (error) |
---|
359 | break; |
---|
360 | inp = (struct inpcb *)so->so_pcb; |
---|
361 | inp->inp_ip_p = (int)nam; |
---|
362 | break; |
---|
363 | |
---|
364 | case PRU_DISCONNECT: |
---|
365 | if ((so->so_state & SS_ISCONNECTED) == 0) { |
---|
366 | error = ENOTCONN; |
---|
367 | break; |
---|
368 | } |
---|
369 | /* FALLTHROUGH */ |
---|
370 | case PRU_ABORT: |
---|
371 | soisdisconnected(so); |
---|
372 | /* FALLTHROUGH */ |
---|
373 | case PRU_DETACH: |
---|
374 | if (inp == 0) |
---|
375 | panic("rip_detach"); |
---|
376 | if (so == ip_mrouter) |
---|
377 | ip_mrouter_done(); |
---|
378 | ip_rsvp_force_done(so); |
---|
379 | if (so == ip_rsvpd) |
---|
380 | ip_rsvp_done(); |
---|
381 | in_pcbdetach(inp); |
---|
382 | break; |
---|
383 | |
---|
384 | case PRU_BIND: |
---|
385 | { |
---|
386 | struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); |
---|
387 | |
---|
388 | if (nam->m_len != sizeof(*addr)) { |
---|
389 | error = EINVAL; |
---|
390 | break; |
---|
391 | } |
---|
392 | if ((ifnet == 0) || |
---|
393 | ((addr->sin_family != AF_INET) && |
---|
394 | (addr->sin_family != AF_IMPLINK)) || |
---|
395 | (addr->sin_addr.s_addr && |
---|
396 | ifa_ifwithaddr((struct sockaddr *)addr) == 0)) { |
---|
397 | error = EADDRNOTAVAIL; |
---|
398 | break; |
---|
399 | } |
---|
400 | inp->inp_laddr = addr->sin_addr; |
---|
401 | break; |
---|
402 | } |
---|
403 | case PRU_CONNECT: |
---|
404 | { |
---|
405 | struct sockaddr_in *addr = mtod(nam, struct sockaddr_in *); |
---|
406 | |
---|
407 | if (nam->m_len != sizeof(*addr)) { |
---|
408 | error = EINVAL; |
---|
409 | break; |
---|
410 | } |
---|
411 | if (ifnet == 0) { |
---|
412 | error = EADDRNOTAVAIL; |
---|
413 | break; |
---|
414 | } |
---|
415 | if ((addr->sin_family != AF_INET) && |
---|
416 | (addr->sin_family != AF_IMPLINK)) { |
---|
417 | error = EAFNOSUPPORT; |
---|
418 | break; |
---|
419 | } |
---|
420 | inp->inp_faddr = addr->sin_addr; |
---|
421 | soisconnected(so); |
---|
422 | break; |
---|
423 | } |
---|
424 | |
---|
425 | case PRU_CONNECT2: |
---|
426 | error = EOPNOTSUPP; |
---|
427 | break; |
---|
428 | |
---|
429 | /* |
---|
430 | * Mark the connection as being incapable of further input. |
---|
431 | */ |
---|
432 | case PRU_SHUTDOWN: |
---|
433 | socantsendmore(so); |
---|
434 | break; |
---|
435 | |
---|
436 | /* |
---|
437 | * Ship a packet out. The appropriate raw output |
---|
438 | * routine handles any massaging necessary. |
---|
439 | */ |
---|
440 | case PRU_SEND: |
---|
441 | { |
---|
442 | register u_long dst; |
---|
443 | |
---|
444 | if (so->so_state & SS_ISCONNECTED) { |
---|
445 | if (nam) { |
---|
446 | error = EISCONN; |
---|
447 | break; |
---|
448 | } |
---|
449 | dst = inp->inp_faddr.s_addr; |
---|
450 | } else { |
---|
451 | if (nam == NULL) { |
---|
452 | error = ENOTCONN; |
---|
453 | break; |
---|
454 | } |
---|
455 | dst = mtod(nam, struct sockaddr_in *)->sin_addr.s_addr; |
---|
456 | } |
---|
457 | error = rip_output(m, so, dst); |
---|
458 | m = NULL; |
---|
459 | break; |
---|
460 | } |
---|
461 | |
---|
462 | case PRU_SENSE: |
---|
463 | /* |
---|
464 | * stat: don't bother with a blocksize. |
---|
465 | */ |
---|
466 | return (0); |
---|
467 | |
---|
468 | /* |
---|
469 | * Not supported. |
---|
470 | */ |
---|
471 | case PRU_RCVOOB: |
---|
472 | case PRU_RCVD: |
---|
473 | case PRU_LISTEN: |
---|
474 | case PRU_ACCEPT: |
---|
475 | case PRU_SENDOOB: |
---|
476 | error = EOPNOTSUPP; |
---|
477 | break; |
---|
478 | |
---|
479 | case PRU_SOCKADDR: |
---|
480 | in_setsockaddr(inp, nam); |
---|
481 | break; |
---|
482 | |
---|
483 | case PRU_PEERADDR: |
---|
484 | in_setpeeraddr(inp, nam); |
---|
485 | break; |
---|
486 | |
---|
487 | default: |
---|
488 | panic("rip_usrreq"); |
---|
489 | } |
---|
490 | if (m != NULL) |
---|
491 | m_freem(m); |
---|
492 | return (error); |
---|
493 | } |
---|