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.
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_ip.c 8.7 (Berkeley) 5/15/95
31 */
32
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD: releng/7.4/sys/netinet/raw_ip.c 211890 2010-08-27 18:50:32Z jhb $");
35
36 #include "opt_inet6.h"
37 #include "opt_ipsec.h"
38 #include "opt_mac.h"
39
40 #include <sys/param.h>
41 #include <sys/jail.h>
42 #include <sys/kernel.h>
43 #include <sys/lock.h>
44 #include <sys/malloc.h>
45 #include <sys/mbuf.h>
46 #include <sys/priv.h>
47 #include <sys/proc.h>
48 #include <sys/protosw.h>
49 #include <sys/signalvar.h>
50 #include <sys/socket.h>
51 #include <sys/socketvar.h>
52 #include <sys/sx.h>
53 #include <sys/sysctl.h>
54 #include <sys/systm.h>
55
56 #include <vm/uma.h>
57
58 #include <net/if.h>
59 #include <net/route.h>
60
61 #include <netinet/in.h>
62 #include <netinet/in_systm.h>
63 #include <netinet/in_pcb.h>
64 #include <netinet/in_var.h>
65 #include <netinet/ip.h>
66 #include <netinet/ip_var.h>
67 #include <netinet/ip_mroute.h>
68
69 #include <netinet/ip_fw.h>
70 #include <netinet/ip_dummynet.h>
71
72 #ifdef IPSEC
73 #include <netipsec/ipsec.h>
74 #endif /*IPSEC*/
75
76 #include <security/mac/mac_framework.h>
77
78 struct inpcbhead ripcb;
79 struct inpcbinfo ripcbinfo;
80
81 /* control hooks for ipfw and dummynet */
82 ip_fw_ctl_t *ip_fw_ctl_ptr = NULL;
83 ip_dn_ctl_t *ip_dn_ctl_ptr = NULL;
84
85 /*
86 * Hooks for multicast routing. They all default to NULL, so leave them not
87 * initialized and rely on BSS being set to 0.
88 */
89
90 /*
91 * The socket used to communicate with the multicast routing daemon.
92 */
93 struct socket *ip_mrouter;
94
95 /*
96 * The various mrouter and rsvp functions.
97 */
98 int (*ip_mrouter_set)(struct socket *, struct sockopt *);
99 int (*ip_mrouter_get)(struct socket *, struct sockopt *);
100 int (*ip_mrouter_done)(void);
101 int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
102 struct ip_moptions *);
103 int (*mrt_ioctl)(int, caddr_t, int);
104 int (*legal_vif_num)(int);
105 u_long (*ip_mcast_src)(int);
106
107 void (*rsvp_input_p)(struct mbuf *m, int off);
108 int (*ip_rsvp_vif)(struct socket *, struct sockopt *);
109 void (*ip_rsvp_force_done)(struct socket *);
110
111 /*
112 * Hash functions
113 */
114
115 #define INP_PCBHASH_RAW_SIZE 256
116 #define INP_PCBHASH_RAW(proto, laddr, faddr, mask) \
117 (((proto) + (laddr) + (faddr)) % (mask) + 1)
118
119 static void
120 rip_inshash(struct inpcb *inp)
121 {
122 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
123 struct inpcbhead *pcbhash;
124 int hash;
125
126 INP_INFO_WLOCK_ASSERT(pcbinfo);
127 INP_WLOCK_ASSERT(inp);
128
129 if (inp->inp_ip_p != 0 &&
130 inp->inp_laddr.s_addr != INADDR_ANY &&
131 inp->inp_faddr.s_addr != INADDR_ANY) {
132 hash = INP_PCBHASH_RAW(inp->inp_ip_p, inp->inp_laddr.s_addr,
133 inp->inp_faddr.s_addr, pcbinfo->ipi_hashmask);
134 } else
135 hash = 0;
136 pcbhash = &pcbinfo->ipi_hashbase[hash];
137 LIST_INSERT_HEAD(pcbhash, inp, inp_hash);
138 }
139
140 static void
141 rip_delhash(struct inpcb *inp)
142 {
143
144 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
145 INP_WLOCK_ASSERT(inp);
146
147 LIST_REMOVE(inp, inp_hash);
148 }
149
150 /*
151 * Raw interface to IP protocol.
152 */
153
154 /*
155 * Initialize raw connection block q.
156 */
157 static void
158 rip_zone_change(void *tag)
159 {
160
161 uma_zone_set_max(ripcbinfo.ipi_zone, maxsockets);
162 }
163
164 static int
165 rip_inpcb_init(void *mem, int size, int flags)
166 {
167 struct inpcb *inp = mem;
168
169 INP_LOCK_INIT(inp, "inp", "rawinp");
170 return (0);
171 }
172
173 void
174 rip_init(void)
175 {
176
177 INP_INFO_LOCK_INIT(&ripcbinfo, "rip");
178 LIST_INIT(&ripcb);
179 ripcbinfo.ipi_listhead = &ripcb;
180 ripcbinfo.ipi_hashbase = hashinit(INP_PCBHASH_RAW_SIZE, M_PCB,
181 &ripcbinfo.ipi_hashmask);
182 ripcbinfo.ipi_porthashbase = hashinit(1, M_PCB,
183 &ripcbinfo.ipi_porthashmask);
184 ripcbinfo.ipi_zone = uma_zcreate("ripcb", sizeof(struct inpcb),
185 NULL, NULL, rip_inpcb_init, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
186 uma_zone_set_max(ripcbinfo.ipi_zone, maxsockets);
187 EVENTHANDLER_REGISTER(maxsockets_change, rip_zone_change, NULL,
188 EVENTHANDLER_PRI_ANY);
189 }
190
191 static int
192 rip_append(struct inpcb *last, struct ip *ip, struct mbuf *n,
193 struct sockaddr_in *ripsrc)
194 {
195 int policyfail = 0;
196
197 INP_RLOCK_ASSERT(last);
198
199 #ifdef IPSEC
200 /* check AH/ESP integrity. */
201 if (ipsec4_in_reject(n, last)) {
202 policyfail = 1;
203 }
204 #endif /* IPSEC */
205 #ifdef MAC
206 if (!policyfail && mac_check_inpcb_deliver(last, n) != 0)
207 policyfail = 1;
208 #endif
209 /* Check the minimum TTL for socket. */
210 if (last->inp_ip_minttl && last->inp_ip_minttl > ip->ip_ttl)
211 policyfail = 1;
212 if (!policyfail) {
213 struct mbuf *opts = NULL;
214 struct socket *so;
215
216 so = last->inp_socket;
217 if ((last->inp_flags & INP_CONTROLOPTS) ||
218 (so->so_options & (SO_TIMESTAMP | SO_BINTIME)))
219 ip_savecontrol(last, &opts, ip, n);
220 SOCKBUF_LOCK(&so->so_rcv);
221 if (sbappendaddr_locked(&so->so_rcv,
222 (struct sockaddr *)ripsrc, n, opts) == 0) {
223 /* should notify about lost packet */
224 m_freem(n);
225 if (opts)
226 m_freem(opts);
227 SOCKBUF_UNLOCK(&so->so_rcv);
228 } else
229 sorwakeup_locked(so);
230 } else
231 m_freem(n);
232 return (policyfail);
233 }
234
235 /*
236 * Setup generic address and protocol structures for raw_input routine, then
237 * pass them along with mbuf chain.
238 */
239 void
240 rip_input(struct mbuf *m, int off)
241 {
242 struct ip *ip = mtod(m, struct ip *);
243 int proto = ip->ip_p;
244 struct inpcb *inp, *last;
245 struct sockaddr_in ripsrc;
246 int hash;
247
248 bzero(&ripsrc, sizeof(ripsrc));
249 ripsrc.sin_len = sizeof(ripsrc);
250 ripsrc.sin_family = AF_INET;
251 ripsrc.sin_addr = ip->ip_src;
252 last = NULL;
253 hash = INP_PCBHASH_RAW(proto, ip->ip_src.s_addr,
254 ip->ip_dst.s_addr, ripcbinfo.ipi_hashmask);
255 INP_INFO_RLOCK(&ripcbinfo);
256 LIST_FOREACH(inp, &ripcbinfo.ipi_hashbase[hash], inp_hash) {
257 if (inp->inp_ip_p != proto)
258 continue;
259 #ifdef INET6
260 /* XXX inp locking */
261 if ((inp->inp_vflag & INP_IPV4) == 0)
262 continue;
263 #endif
264 if (inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
265 continue;
266 if (inp->inp_faddr.s_addr != ip->ip_src.s_addr)
267 continue;
268 if (prison_check_ip4(inp->inp_cred, &ip->ip_dst) != 0)
269 continue;
270 if (last) {
271 struct mbuf *n;
272
273 n = m_copy(m, 0, (int)M_COPYALL);
274 if (n != NULL)
275 (void) rip_append(last, ip, n, &ripsrc);
276 /* XXX count dropped packet */
277 INP_RUNLOCK(last);
278 }
279 INP_RLOCK(inp);
280 last = inp;
281 }
282 LIST_FOREACH(inp, &ripcbinfo.ipi_hashbase[0], inp_hash) {
283 if (inp->inp_ip_p && inp->inp_ip_p != proto)
284 continue;
285 #ifdef INET6
286 /* XXX inp locking */
287 if ((inp->inp_vflag & INP_IPV4) == 0)
288 continue;
289 #endif
290 if (inp->inp_laddr.s_addr &&
291 inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
292 continue;
293 if (inp->inp_faddr.s_addr &&
294 inp->inp_faddr.s_addr != ip->ip_src.s_addr)
295 continue;
296 if (prison_check_ip4(inp->inp_cred, &ip->ip_dst) != 0)
297 continue;
298 if (last) {
299 struct mbuf *n;
300
301 n = m_copy(m, 0, (int)M_COPYALL);
302 if (n != NULL)
303 (void) rip_append(last, ip, n, &ripsrc);
304 /* XXX count dropped packet */
305 INP_RUNLOCK(last);
306 }
307 INP_RLOCK(inp);
308 last = inp;
309 }
310 INP_INFO_RUNLOCK(&ripcbinfo);
311 if (last != NULL) {
312 if (rip_append(last, ip, m, &ripsrc) != 0)
313 ipstat.ips_delivered--;
314 INP_RUNLOCK(last);
315 } else {
316 m_freem(m);
317 ipstat.ips_noproto++;
318 ipstat.ips_delivered--;
319 }
320 }
321
322 /*
323 * Generate IP header and pass packet to ip_output. Tack on options user may
324 * have setup with control call.
325 */
326 int
327 rip_output(struct mbuf *m, struct socket *so, u_long dst)
328 {
329 struct ip *ip;
330 int error;
331 struct inpcb *inp = sotoinpcb(so);
332 int flags = ((so->so_options & SO_DONTROUTE) ? IP_ROUTETOIF : 0) |
333 IP_ALLOWBROADCAST;
334
335 /*
336 * If the user handed us a complete IP packet, use it. Otherwise,
337 * allocate an mbuf for a header and fill it in.
338 */
339 if ((inp->inp_flags & INP_HDRINCL) == 0) {
340 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) {
341 m_freem(m);
342 return(EMSGSIZE);
343 }
344 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
345 if (m == NULL)
346 return(ENOBUFS);
347
348 INP_RLOCK(inp);
349 ip = mtod(m, struct ip *);
350 ip->ip_tos = inp->inp_ip_tos;
351 if (inp->inp_flags & INP_DONTFRAG)
352 ip->ip_off = IP_DF;
353 else
354 ip->ip_off = 0;
355 ip->ip_p = inp->inp_ip_p;
356 ip->ip_len = m->m_pkthdr.len;
357 ip->ip_src = inp->inp_laddr;
358 error = prison_get_ip4(inp->inp_cred, &ip->ip_src);
359 if (error != 0) {
360 INP_RUNLOCK(inp);
361 m_freem(m);
362 return (error);
363 }
364 ip->ip_dst.s_addr = dst;
365 ip->ip_ttl = inp->inp_ip_ttl;
366 } else {
367 if (m->m_pkthdr.len > IP_MAXPACKET) {
368 m_freem(m);
369 return(EMSGSIZE);
370 }
371 INP_RLOCK(inp);
372 ip = mtod(m, struct ip *);
373 error = prison_check_ip4(inp->inp_cred, &ip->ip_src);
374 if (error != 0) {
375 INP_RUNLOCK(inp);
376 m_freem(m);
377 return (error);
378 }
379
380 /*
381 * Don't allow both user specified and setsockopt options,
382 * and don't allow packet length sizes that will crash.
383 */
384 if (((ip->ip_hl != (sizeof (*ip) >> 2)) && inp->inp_options)
385 || (ip->ip_len > m->m_pkthdr.len)
386 || (ip->ip_len < (ip->ip_hl << 2))) {
387 INP_RUNLOCK(inp);
388 m_freem(m);
389 return (EINVAL);
390 }
391 if (ip->ip_id == 0)
392 ip->ip_id = ip_newid();
393
394 /*
395 * XXX prevent ip_output from overwriting header fields.
396 */
397 flags |= IP_RAWOUTPUT;
398 ipstat.ips_rawout++;
399 }
400
401 if (inp->inp_flags & INP_ONESBCAST)
402 flags |= IP_SENDONES;
403
404 #ifdef MAC
405 mac_create_mbuf_from_inpcb(inp, m);
406 #endif
407
408 error = ip_output(m, inp->inp_options, NULL, flags,
409 inp->inp_moptions, inp);
410 INP_RUNLOCK(inp);
411 return (error);
412 }
413
414 /*
415 * Raw IP socket option processing.
416 *
417 * IMPORTANT NOTE regarding access control: Traditionally, raw sockets could
418 * only be created by a privileged process, and as such, socket option
419 * operations to manage system properties on any raw socket were allowed to
420 * take place without explicit additional access control checks. However,
421 * raw sockets can now also be created in jail(), and therefore explicit
422 * checks are now required. Likewise, raw sockets can be used by a process
423 * after it gives up privilege, so some caution is required. For options
424 * passed down to the IP layer via ip_ctloutput(), checks are assumed to be
425 * performed in ip_ctloutput() and therefore no check occurs here.
426 * Unilaterally checking priv_check() here breaks normal IP socket option
427 * operations on raw sockets.
428 *
429 * When adding new socket options here, make sure to add access control
430 * checks here as necessary.
431 */
432 int
433 rip_ctloutput(struct socket *so, struct sockopt *sopt)
434 {
435 struct inpcb *inp = sotoinpcb(so);
436 int error, optval;
437
438 if (sopt->sopt_level != IPPROTO_IP) {
439 if ((sopt->sopt_level == SOL_SOCKET) &&
440 (sopt->sopt_name == SO_SETFIB)) {
441 inp->inp_inc.inc_fibnum = so->so_fibnum;
442 return (0);
443 }
444 return (EINVAL);
445 }
446
447 error = 0;
448 switch (sopt->sopt_dir) {
449 case SOPT_GET:
450 switch (sopt->sopt_name) {
451 case IP_HDRINCL:
452 optval = inp->inp_flags & INP_HDRINCL;
453 error = sooptcopyout(sopt, &optval, sizeof optval);
454 break;
455
456 case IP_FW3: /* generic ipfw v.3 functions */
457 case IP_FW_ADD: /* ADD actually returns the body... */
458 case IP_FW_GET:
459 case IP_FW_TABLE_GETSIZE:
460 case IP_FW_TABLE_LIST:
461 case IP_FW_NAT_GET_CONFIG:
462 case IP_FW_NAT_GET_LOG:
463 if (ip_fw_ctl_ptr != NULL)
464 error = ip_fw_ctl_ptr(sopt);
465 else
466 error = ENOPROTOOPT;
467 break;
468
469 case IP_DUMMYNET3: /* generic dummynet v.3 functions */
470 case IP_DUMMYNET_GET:
471 if (ip_dn_ctl_ptr != NULL)
472 error = ip_dn_ctl_ptr(sopt);
473 else
474 error = ENOPROTOOPT;
475 break ;
476
477 case MRT_INIT:
478 case MRT_DONE:
479 case MRT_ADD_VIF:
480 case MRT_DEL_VIF:
481 case MRT_ADD_MFC:
482 case MRT_DEL_MFC:
483 case MRT_VERSION:
484 case MRT_ASSERT:
485 case MRT_API_SUPPORT:
486 case MRT_API_CONFIG:
487 case MRT_ADD_BW_UPCALL:
488 case MRT_DEL_BW_UPCALL:
489 error = priv_check(curthread, PRIV_NETINET_MROUTE);
490 if (error != 0)
491 return (error);
492 error = ip_mrouter_get ? ip_mrouter_get(so, sopt) :
493 EOPNOTSUPP;
494 break;
495
496 default:
497 error = ip_ctloutput(so, sopt);
498 break;
499 }
500 break;
501
502 case SOPT_SET:
503 switch (sopt->sopt_name) {
504 case IP_HDRINCL:
505 error = sooptcopyin(sopt, &optval, sizeof optval,
506 sizeof optval);
507 if (error)
508 break;
509 if (optval)
510 inp->inp_flags |= INP_HDRINCL;
511 else
512 inp->inp_flags &= ~INP_HDRINCL;
513 break;
514
515 case IP_FW3: /* generic ipfw v.3 functions */
516 case IP_FW_ADD:
517 case IP_FW_DEL:
518 case IP_FW_FLUSH:
519 case IP_FW_ZERO:
520 case IP_FW_RESETLOG:
521 case IP_FW_TABLE_ADD:
522 case IP_FW_TABLE_DEL:
523 case IP_FW_TABLE_FLUSH:
524 case IP_FW_NAT_CFG:
525 case IP_FW_NAT_DEL:
526 if (ip_fw_ctl_ptr != NULL)
527 error = ip_fw_ctl_ptr(sopt);
528 else
529 error = ENOPROTOOPT;
530 break;
531
532 case IP_DUMMYNET3: /* generic dummynet v.3 functions */
533 case IP_DUMMYNET_CONFIGURE:
534 case IP_DUMMYNET_DEL:
535 case IP_DUMMYNET_FLUSH:
536 if (ip_dn_ctl_ptr != NULL)
537 error = ip_dn_ctl_ptr(sopt);
538 else
539 error = ENOPROTOOPT ;
540 break ;
541
542 case IP_RSVP_ON:
543 error = priv_check(curthread, PRIV_NETINET_MROUTE);
544 if (error != 0)
545 return (error);
546 error = ip_rsvp_init(so);
547 break;
548
549 case IP_RSVP_OFF:
550 error = priv_check(curthread, PRIV_NETINET_MROUTE);
551 if (error != 0)
552 return (error);
553 error = ip_rsvp_done();
554 break;
555
556 case IP_RSVP_VIF_ON:
557 case IP_RSVP_VIF_OFF:
558 error = priv_check(curthread, PRIV_NETINET_MROUTE);
559 if (error != 0)
560 return (error);
561 error = ip_rsvp_vif ?
562 ip_rsvp_vif(so, sopt) : EINVAL;
563 break;
564
565 case MRT_INIT:
566 case MRT_DONE:
567 case MRT_ADD_VIF:
568 case MRT_DEL_VIF:
569 case MRT_ADD_MFC:
570 case MRT_DEL_MFC:
571 case MRT_VERSION:
572 case MRT_ASSERT:
573 case MRT_API_SUPPORT:
574 case MRT_API_CONFIG:
575 case MRT_ADD_BW_UPCALL:
576 case MRT_DEL_BW_UPCALL:
577 error = priv_check(curthread, PRIV_NETINET_MROUTE);
578 if (error != 0)
579 return (error);
580 error = ip_mrouter_set ? ip_mrouter_set(so, sopt) :
581 EOPNOTSUPP;
582 break;
583
584 default:
585 error = ip_ctloutput(so, sopt);
586 break;
587 }
588 break;
589 }
590
591 return (error);
592 }
593
594 /*
595 * This function exists solely to receive the PRC_IFDOWN messages which are
596 * sent by if_down(). It looks for an ifaddr whose ifa_addr is sa, and calls
597 * in_ifadown() to remove all routes corresponding to that address. It also
598 * receives the PRC_IFUP messages from if_up() and reinstalls the interface
599 * routes.
600 */
601 void
602 rip_ctlinput(int cmd, struct sockaddr *sa, void *vip)
603 {
604 struct in_ifaddr *ia;
605 struct ifnet *ifp;
606 int err;
607 int flags;
608
609 switch (cmd) {
610 case PRC_IFDOWN:
611 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) {
612 if (ia->ia_ifa.ifa_addr == sa
613 && (ia->ia_flags & IFA_ROUTE)) {
614 /*
615 * in_ifscrub kills the interface route.
616 */
617 in_ifscrub(ia->ia_ifp, ia);
618 /*
619 * in_ifadown gets rid of all the rest of the
620 * routes. This is not quite the right thing
621 * to do, but at least if we are running a
622 * routing process they will come back.
623 */
624 in_ifadown(&ia->ia_ifa, 0);
625 break;
626 }
627 }
628 break;
629
630 case PRC_IFUP:
631 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) {
632 if (ia->ia_ifa.ifa_addr == sa)
633 break;
634 }
635 if (ia == 0 || (ia->ia_flags & IFA_ROUTE))
636 return;
637 flags = RTF_UP;
638 ifp = ia->ia_ifa.ifa_ifp;
639
640 if ((ifp->if_flags & IFF_LOOPBACK)
641 || (ifp->if_flags & IFF_POINTOPOINT))
642 flags |= RTF_HOST;
643
644 err = rtinit(&ia->ia_ifa, RTM_ADD, flags);
645 if (err == 0)
646 ia->ia_flags |= IFA_ROUTE;
647 break;
648 }
649 }
650
651 u_long rip_sendspace = 9216;
652 u_long rip_recvspace = 9216;
653
654 SYSCTL_ULONG(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW,
655 &rip_sendspace, 0, "Maximum outgoing raw IP datagram size");
656 SYSCTL_ULONG(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW,
657 &rip_recvspace, 0, "Maximum space for incoming raw IP datagrams");
658
659 static int
660 rip_attach(struct socket *so, int proto, struct thread *td)
661 {
662 struct inpcb *inp;
663 int error;
664
665 inp = sotoinpcb(so);
666 KASSERT(inp == NULL, ("rip_attach: inp != NULL"));
667
668 error = priv_check(td, PRIV_NETINET_RAW);
669 if (error)
670 return (error);
671 if (proto >= IPPROTO_MAX || proto < 0)
672 return EPROTONOSUPPORT;
673 error = soreserve(so, rip_sendspace, rip_recvspace);
674 if (error)
675 return (error);
676 INP_INFO_WLOCK(&ripcbinfo);
677 error = in_pcballoc(so, &ripcbinfo);
678 if (error) {
679 INP_INFO_WUNLOCK(&ripcbinfo);
680 return (error);
681 }
682 inp = (struct inpcb *)so->so_pcb;
683 inp->inp_vflag |= INP_IPV4;
684 inp->inp_ip_p = proto;
685 inp->inp_ip_ttl = ip_defttl;
686 rip_inshash(inp);
687 INP_INFO_WUNLOCK(&ripcbinfo);
688 INP_WUNLOCK(inp);
689 return (0);
690 }
691
692 static void
693 rip_detach(struct socket *so)
694 {
695 struct inpcb *inp;
696
697 inp = sotoinpcb(so);
698 KASSERT(inp != NULL, ("rip_detach: inp == NULL"));
699 KASSERT(inp->inp_faddr.s_addr == INADDR_ANY,
700 ("rip_detach: not closed"));
701
702 INP_INFO_WLOCK(&ripcbinfo);
703 INP_WLOCK(inp);
704 rip_delhash(inp);
705 if (so == ip_mrouter && ip_mrouter_done)
706 ip_mrouter_done();
707 if (ip_rsvp_force_done)
708 ip_rsvp_force_done(so);
709 if (so == ip_rsvpd)
710 ip_rsvp_done();
711 in_pcbdetach(inp);
712 in_pcbfree(inp);
713 INP_INFO_WUNLOCK(&ripcbinfo);
714 }
715
716 static void
717 rip_dodisconnect(struct socket *so, struct inpcb *inp)
718 {
719
720 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
721 INP_WLOCK_ASSERT(inp);
722
723 rip_delhash(inp);
724 inp->inp_faddr.s_addr = INADDR_ANY;
725 rip_inshash(inp);
726 SOCK_LOCK(so);
727 so->so_state &= ~SS_ISCONNECTED;
728 SOCK_UNLOCK(so);
729 }
730
731 static void
732 rip_abort(struct socket *so)
733 {
734 struct inpcb *inp;
735
736 inp = sotoinpcb(so);
737 KASSERT(inp != NULL, ("rip_abort: inp == NULL"));
738
739 INP_INFO_WLOCK(&ripcbinfo);
740 INP_WLOCK(inp);
741 rip_dodisconnect(so, inp);
742 INP_WUNLOCK(inp);
743 INP_INFO_WUNLOCK(&ripcbinfo);
744 }
745
746 static void
747 rip_close(struct socket *so)
748 {
749 struct inpcb *inp;
750
751 inp = sotoinpcb(so);
752 KASSERT(inp != NULL, ("rip_close: inp == NULL"));
753
754 INP_INFO_WLOCK(&ripcbinfo);
755 INP_WLOCK(inp);
756 rip_dodisconnect(so, inp);
757 INP_WUNLOCK(inp);
758 INP_INFO_WUNLOCK(&ripcbinfo);
759 }
760
761 static int
762 rip_disconnect(struct socket *so)
763 {
764 struct inpcb *inp;
765
766 if ((so->so_state & SS_ISCONNECTED) == 0)
767 return (ENOTCONN);
768
769 inp = sotoinpcb(so);
770 KASSERT(inp != NULL, ("rip_disconnect: inp == NULL"));
771
772 INP_INFO_WLOCK(&ripcbinfo);
773 INP_WLOCK(inp);
774 rip_dodisconnect(so, inp);
775 INP_WUNLOCK(inp);
776 INP_INFO_WUNLOCK(&ripcbinfo);
777 return (0);
778 }
779
780 static int
781 rip_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
782 {
783 struct sockaddr_in *addr = (struct sockaddr_in *)nam;
784 struct inpcb *inp;
785 int error;
786
787 if (nam->sa_len != sizeof(*addr))
788 return (EINVAL);
789
790 error = prison_check_ip4(td->td_ucred, &addr->sin_addr);
791 if (error != 0)
792 return (error);
793
794 if (TAILQ_EMPTY(&ifnet) ||
795 (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) ||
796 (addr->sin_addr.s_addr &&
797 ifa_ifwithaddr((struct sockaddr *)addr) == 0))
798 return (EADDRNOTAVAIL);
799
800 inp = sotoinpcb(so);
801 KASSERT(inp != NULL, ("rip_bind: inp == NULL"));
802
803 INP_INFO_WLOCK(&ripcbinfo);
804 INP_WLOCK(inp);
805 rip_delhash(inp);
806 inp->inp_laddr = addr->sin_addr;
807 rip_inshash(inp);
808 INP_WUNLOCK(inp);
809 INP_INFO_WUNLOCK(&ripcbinfo);
810 return (0);
811 }
812
813 static int
814 rip_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
815 {
816 struct sockaddr_in *addr = (struct sockaddr_in *)nam;
817 struct inpcb *inp;
818
819 if (nam->sa_len != sizeof(*addr))
820 return (EINVAL);
821 if (TAILQ_EMPTY(&ifnet))
822 return (EADDRNOTAVAIL);
823 if (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK)
824 return (EAFNOSUPPORT);
825
826 inp = sotoinpcb(so);
827 KASSERT(inp != NULL, ("rip_connect: inp == NULL"));
828
829 INP_INFO_WLOCK(&ripcbinfo);
830 INP_WLOCK(inp);
831 rip_delhash(inp);
832 inp->inp_faddr = addr->sin_addr;
833 rip_inshash(inp);
834 soisconnected(so);
835 INP_WUNLOCK(inp);
836 INP_INFO_WUNLOCK(&ripcbinfo);
837 return (0);
838 }
839
840 static int
841 rip_shutdown(struct socket *so)
842 {
843 struct inpcb *inp;
844
845 inp = sotoinpcb(so);
846 KASSERT(inp != NULL, ("rip_shutdown: inp == NULL"));
847
848 INP_WLOCK(inp);
849 socantsendmore(so);
850 INP_WUNLOCK(inp);
851 return (0);
852 }
853
854 static int
855 rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
856 struct mbuf *control, struct thread *td)
857 {
858 struct inpcb *inp;
859 u_long dst;
860
861 inp = sotoinpcb(so);
862 KASSERT(inp != NULL, ("rip_send: inp == NULL"));
863
864 /*
865 * Note: 'dst' reads below are unlocked.
866 */
867 if (so->so_state & SS_ISCONNECTED) {
868 if (nam) {
869 m_freem(m);
870 return (EISCONN);
871 }
872 dst = inp->inp_faddr.s_addr; /* Unlocked read. */
873 } else {
874 if (nam == NULL) {
875 m_freem(m);
876 return (ENOTCONN);
877 }
878 dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr;
879 }
880 return (rip_output(m, so, dst));
881 }
882
883 static int
884 rip_pcblist(SYSCTL_HANDLER_ARGS)
885 {
886 int error, i, n;
887 struct inpcb *inp, **inp_list;
888 inp_gen_t gencnt;
889 struct xinpgen xig;
890
891 /*
892 * The process of preparing the TCB list is too time-consuming and
893 * resource-intensive to repeat twice on every request.
894 */
895 if (req->oldptr == 0) {
896 n = ripcbinfo.ipi_count;
897 n += imax(n / 8, 10);
898 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb);
899 return (0);
900 }
901
902 if (req->newptr != 0)
903 return (EPERM);
904
905 /*
906 * OK, now we're committed to doing something.
907 */
908 INP_INFO_RLOCK(&ripcbinfo);
909 gencnt = ripcbinfo.ipi_gencnt;
910 n = ripcbinfo.ipi_count;
911 INP_INFO_RUNLOCK(&ripcbinfo);
912
913 xig.xig_len = sizeof xig;
914 xig.xig_count = n;
915 xig.xig_gen = gencnt;
916 xig.xig_sogen = so_gencnt;
917 error = SYSCTL_OUT(req, &xig, sizeof xig);
918 if (error)
919 return (error);
920
921 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
922 if (inp_list == 0)
923 return (ENOMEM);
924
925 INP_INFO_RLOCK(&ripcbinfo);
926 for (inp = LIST_FIRST(ripcbinfo.ipi_listhead), i = 0; inp && i < n;
927 inp = LIST_NEXT(inp, inp_list)) {
928 INP_RLOCK(inp);
929 if (inp->inp_gencnt <= gencnt &&
930 cr_canseeinpcb(req->td->td_ucred, inp) == 0) {
931 /* XXX held references? */
932 inp_list[i++] = inp;
933 }
934 INP_RUNLOCK(inp);
935 }
936 INP_INFO_RUNLOCK(&ripcbinfo);
937 n = i;
938
939 error = 0;
940 for (i = 0; i < n; i++) {
941 inp = inp_list[i];
942 INP_RLOCK(inp);
943 if (inp->inp_gencnt <= gencnt) {
944 struct xinpcb xi;
945 bzero(&xi, sizeof(xi));
946 xi.xi_len = sizeof xi;
947 /* XXX should avoid extra copy */
948 bcopy(inp, &xi.xi_inp, sizeof *inp);
949 if (inp->inp_socket)
950 sotoxsocket(inp->inp_socket, &xi.xi_socket);
951 INP_RUNLOCK(inp);
952 error = SYSCTL_OUT(req, &xi, sizeof xi);
953 } else
954 INP_RUNLOCK(inp);
955 }
956 if (!error) {
957 /*
958 * Give the user an updated idea of our state. If the
959 * generation differs from what we told her before, she knows
960 * that something happened while we were processing this
961 * request, and it might be necessary to retry.
962 */
963 INP_INFO_RLOCK(&ripcbinfo);
964 xig.xig_gen = ripcbinfo.ipi_gencnt;
965 xig.xig_sogen = so_gencnt;
966 xig.xig_count = ripcbinfo.ipi_count;
967 INP_INFO_RUNLOCK(&ripcbinfo);
968 error = SYSCTL_OUT(req, &xig, sizeof xig);
969 }
970 free(inp_list, M_TEMP);
971 return (error);
972 }
973
974 SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, CTLFLAG_RD, 0, 0,
975 rip_pcblist, "S,xinpcb", "List of active raw IP sockets");
976
977 struct pr_usrreqs rip_usrreqs = {
978 .pru_abort = rip_abort,
979 .pru_attach = rip_attach,
980 .pru_bind = rip_bind,
981 .pru_connect = rip_connect,
982 .pru_control = in_control,
983 .pru_detach = rip_detach,
984 .pru_disconnect = rip_disconnect,
985 .pru_peeraddr = in_getpeeraddr,
986 .pru_send = rip_send,
987 .pru_shutdown = rip_shutdown,
988 .pru_sockaddr = in_getsockaddr,
989 .pru_sosetlabel = in_pcbsosetlabel,
990 .pru_close = rip_close,
991 };
Cache object: 9fc89839a6653c488f062261bd52975c
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