1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1982, 1986, 1988, 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_ip.c 8.7 (Berkeley) 5/15/95
33 */
34
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
37
38 #include "opt_inet.h"
39 #include "opt_inet6.h"
40 #include "opt_ipsec.h"
41
42 #include <sys/param.h>
43 #include <sys/jail.h>
44 #include <sys/kernel.h>
45 #include <sys/eventhandler.h>
46 #include <sys/lock.h>
47 #include <sys/malloc.h>
48 #include <sys/mbuf.h>
49 #include <sys/priv.h>
50 #include <sys/proc.h>
51 #include <sys/protosw.h>
52 #include <sys/rmlock.h>
53 #include <sys/rwlock.h>
54 #include <sys/signalvar.h>
55 #include <sys/socket.h>
56 #include <sys/socketvar.h>
57 #include <sys/sx.h>
58 #include <sys/sysctl.h>
59 #include <sys/systm.h>
60
61 #include <vm/uma.h>
62
63 #include <net/if.h>
64 #include <net/if_var.h>
65 #include <net/route.h>
66 #include <net/vnet.h>
67
68 #include <netinet/in.h>
69 #include <netinet/in_systm.h>
70 #include <netinet/in_pcb.h>
71 #include <netinet/in_var.h>
72 #include <netinet/if_ether.h>
73 #include <netinet/ip.h>
74 #include <netinet/ip_var.h>
75 #include <netinet/ip_mroute.h>
76 #include <netinet/ip_icmp.h>
77
78 #include <netipsec/ipsec_support.h>
79
80 #include <machine/stdarg.h>
81 #include <security/mac/mac_framework.h>
82
83 VNET_DEFINE(int, ip_defttl) = IPDEFTTL;
84 SYSCTL_INT(_net_inet_ip, IPCTL_DEFTTL, ttl, CTLFLAG_VNET | CTLFLAG_RW,
85 &VNET_NAME(ip_defttl), 0,
86 "Maximum TTL on IP packets");
87
88 VNET_DEFINE(struct inpcbhead, ripcb);
89 VNET_DEFINE(struct inpcbinfo, ripcbinfo);
90
91 #define V_ripcb VNET(ripcb)
92 #define V_ripcbinfo VNET(ripcbinfo)
93
94 /*
95 * Control and data hooks for ipfw, dummynet, divert and so on.
96 * The data hooks are not used here but it is convenient
97 * to keep them all in one place.
98 */
99 VNET_DEFINE(ip_fw_chk_ptr_t, ip_fw_chk_ptr) = NULL;
100 VNET_DEFINE(ip_fw_ctl_ptr_t, ip_fw_ctl_ptr) = NULL;
101
102 int (*ip_dn_ctl_ptr)(struct sockopt *);
103 int (*ip_dn_io_ptr)(struct mbuf **, int, struct ip_fw_args *);
104 void (*ip_divert_ptr)(struct mbuf *, int);
105 int (*ng_ipfw_input_p)(struct mbuf **, int,
106 struct ip_fw_args *, int);
107
108 #ifdef INET
109 /*
110 * Hooks for multicast routing. They all default to NULL, so leave them not
111 * initialized and rely on BSS being set to 0.
112 */
113
114 /*
115 * The socket used to communicate with the multicast routing daemon.
116 */
117 VNET_DEFINE(struct socket *, ip_mrouter);
118
119 /*
120 * The various mrouter and rsvp functions.
121 */
122 int (*ip_mrouter_set)(struct socket *, struct sockopt *);
123 int (*ip_mrouter_get)(struct socket *, struct sockopt *);
124 int (*ip_mrouter_done)(void);
125 int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
126 struct ip_moptions *);
127 int (*mrt_ioctl)(u_long, caddr_t, int);
128 int (*legal_vif_num)(int);
129 u_long (*ip_mcast_src)(int);
130
131 int (*rsvp_input_p)(struct mbuf **, int *, int);
132 int (*ip_rsvp_vif)(struct socket *, struct sockopt *);
133 void (*ip_rsvp_force_done)(struct socket *);
134 #endif /* INET */
135
136 extern struct protosw inetsw[];
137
138 u_long rip_sendspace = 9216;
139 SYSCTL_ULONG(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW,
140 &rip_sendspace, 0, "Maximum outgoing raw IP datagram size");
141
142 u_long rip_recvspace = 9216;
143 SYSCTL_ULONG(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW,
144 &rip_recvspace, 0, "Maximum space for incoming raw IP datagrams");
145
146 /*
147 * Hash functions
148 */
149
150 #define INP_PCBHASH_RAW_SIZE 256
151 #define INP_PCBHASH_RAW(proto, laddr, faddr, mask) \
152 (((proto) + (laddr) + (faddr)) % (mask) + 1)
153
154 #ifdef INET
155 static void
rip_inshash(struct inpcb * inp)156 rip_inshash(struct inpcb *inp)
157 {
158 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
159 struct inpcbhead *pcbhash;
160 int hash;
161
162 INP_INFO_WLOCK_ASSERT(pcbinfo);
163 INP_WLOCK_ASSERT(inp);
164
165 if (inp->inp_ip_p != 0 &&
166 inp->inp_laddr.s_addr != INADDR_ANY &&
167 inp->inp_faddr.s_addr != INADDR_ANY) {
168 hash = INP_PCBHASH_RAW(inp->inp_ip_p, inp->inp_laddr.s_addr,
169 inp->inp_faddr.s_addr, pcbinfo->ipi_hashmask);
170 } else
171 hash = 0;
172 pcbhash = &pcbinfo->ipi_hashbase[hash];
173 CK_LIST_INSERT_HEAD(pcbhash, inp, inp_hash);
174 }
175
176 static void
rip_delhash(struct inpcb * inp)177 rip_delhash(struct inpcb *inp)
178 {
179
180 INP_INFO_WLOCK_ASSERT(inp->inp_pcbinfo);
181 INP_WLOCK_ASSERT(inp);
182
183 CK_LIST_REMOVE(inp, inp_hash);
184 }
185 #endif /* INET */
186
187 /*
188 * Raw interface to IP protocol.
189 */
190
191 /*
192 * Initialize raw connection block q.
193 */
194 static void
rip_zone_change(void * tag)195 rip_zone_change(void *tag)
196 {
197
198 uma_zone_set_max(V_ripcbinfo.ipi_zone, maxsockets);
199 }
200
201 static int
rip_inpcb_init(void * mem,int size,int flags)202 rip_inpcb_init(void *mem, int size, int flags)
203 {
204 struct inpcb *inp = mem;
205
206 INP_LOCK_INIT(inp, "inp", "rawinp");
207 return (0);
208 }
209
210 void
rip_init(void)211 rip_init(void)
212 {
213
214 in_pcbinfo_init(&V_ripcbinfo, "rip", &V_ripcb, INP_PCBHASH_RAW_SIZE,
215 1, "ripcb", rip_inpcb_init, IPI_HASHFIELDS_NONE);
216 EVENTHANDLER_REGISTER(maxsockets_change, rip_zone_change, NULL,
217 EVENTHANDLER_PRI_ANY);
218 }
219
220 #ifdef VIMAGE
221 static void
rip_destroy(void * unused __unused)222 rip_destroy(void *unused __unused)
223 {
224
225 in_pcbinfo_destroy(&V_ripcbinfo);
226 }
227 VNET_SYSUNINIT(raw_ip, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, rip_destroy, NULL);
228 #endif
229
230 #ifdef INET
231 static int
rip_append(struct inpcb * last,struct ip * ip,struct mbuf * n,struct sockaddr_in * ripsrc)232 rip_append(struct inpcb *last, struct ip *ip, struct mbuf *n,
233 struct sockaddr_in *ripsrc)
234 {
235 int policyfail = 0;
236
237 INP_LOCK_ASSERT(last);
238
239 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
240 /* check AH/ESP integrity. */
241 if (IPSEC_ENABLED(ipv4)) {
242 if (IPSEC_CHECK_POLICY(ipv4, n, last) != 0)
243 policyfail = 1;
244 }
245 #endif /* IPSEC */
246 #ifdef MAC
247 if (!policyfail && mac_inpcb_check_deliver(last, n) != 0)
248 policyfail = 1;
249 #endif
250 /* Check the minimum TTL for socket. */
251 if (last->inp_ip_minttl && last->inp_ip_minttl > ip->ip_ttl)
252 policyfail = 1;
253 if (!policyfail) {
254 struct mbuf *opts = NULL;
255 struct socket *so;
256
257 so = last->inp_socket;
258 if ((last->inp_flags & INP_CONTROLOPTS) ||
259 (so->so_options & (SO_TIMESTAMP | SO_BINTIME)))
260 ip_savecontrol(last, &opts, ip, n);
261 SOCKBUF_LOCK(&so->so_rcv);
262 if (sbappendaddr_locked(&so->so_rcv,
263 (struct sockaddr *)ripsrc, n, opts) == 0) {
264 /* should notify about lost packet */
265 m_freem(n);
266 if (opts)
267 m_freem(opts);
268 SOCKBUF_UNLOCK(&so->so_rcv);
269 } else
270 sorwakeup_locked(so);
271 } else
272 m_freem(n);
273 return (policyfail);
274 }
275
276 /*
277 * Setup generic address and protocol structures for raw_input routine, then
278 * pass them along with mbuf chain.
279 */
280 int
rip_input(struct mbuf ** mp,int * offp,int proto)281 rip_input(struct mbuf **mp, int *offp, int proto)
282 {
283 struct ifnet *ifp;
284 struct mbuf *m = *mp;
285 struct ip *ip = mtod(m, struct ip *);
286 struct inpcb *inp, *last;
287 struct sockaddr_in ripsrc;
288 struct epoch_tracker et;
289 int hash;
290
291 *mp = NULL;
292
293 bzero(&ripsrc, sizeof(ripsrc));
294 ripsrc.sin_len = sizeof(ripsrc);
295 ripsrc.sin_family = AF_INET;
296 ripsrc.sin_addr = ip->ip_src;
297 last = NULL;
298
299 ifp = m->m_pkthdr.rcvif;
300
301 hash = INP_PCBHASH_RAW(proto, ip->ip_src.s_addr,
302 ip->ip_dst.s_addr, V_ripcbinfo.ipi_hashmask);
303 INP_INFO_RLOCK_ET(&V_ripcbinfo, et);
304 CK_LIST_FOREACH(inp, &V_ripcbinfo.ipi_hashbase[hash], inp_hash) {
305 if (inp->inp_ip_p != proto)
306 continue;
307 #ifdef INET6
308 /* XXX inp locking */
309 if ((inp->inp_vflag & INP_IPV4) == 0)
310 continue;
311 #endif
312 if (inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
313 continue;
314 if (inp->inp_faddr.s_addr != ip->ip_src.s_addr)
315 continue;
316 if (last != NULL) {
317 struct mbuf *n;
318
319 n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
320 if (n != NULL)
321 (void) rip_append(last, ip, n, &ripsrc);
322 /* XXX count dropped packet */
323 INP_RUNLOCK(last);
324 last = NULL;
325 }
326 INP_RLOCK(inp);
327 if (__predict_false(inp->inp_flags2 & INP_FREED))
328 goto skip_1;
329 if (jailed_without_vnet(inp->inp_cred)) {
330 /*
331 * XXX: If faddr was bound to multicast group,
332 * jailed raw socket will drop datagram.
333 */
334 if (prison_check_ip4(inp->inp_cred, &ip->ip_dst) != 0)
335 goto skip_1;
336 }
337 last = inp;
338 continue;
339 skip_1:
340 INP_RUNLOCK(inp);
341 }
342 CK_LIST_FOREACH(inp, &V_ripcbinfo.ipi_hashbase[0], inp_hash) {
343 if (inp->inp_ip_p && inp->inp_ip_p != proto)
344 continue;
345 #ifdef INET6
346 /* XXX inp locking */
347 if ((inp->inp_vflag & INP_IPV4) == 0)
348 continue;
349 #endif
350 if (!in_nullhost(inp->inp_laddr) &&
351 !in_hosteq(inp->inp_laddr, ip->ip_dst))
352 continue;
353 if (!in_nullhost(inp->inp_faddr) &&
354 !in_hosteq(inp->inp_faddr, ip->ip_src))
355 continue;
356 if (last != NULL) {
357 struct mbuf *n;
358
359 n = m_copym(m, 0, M_COPYALL, M_NOWAIT);
360 if (n != NULL)
361 (void) rip_append(last, ip, n, &ripsrc);
362 /* XXX count dropped packet */
363 INP_RUNLOCK(last);
364 last = NULL;
365 }
366 INP_RLOCK(inp);
367 if (__predict_false(inp->inp_flags2 & INP_FREED))
368 goto skip_2;
369 if (jailed_without_vnet(inp->inp_cred)) {
370 /*
371 * Allow raw socket in jail to receive multicast;
372 * assume process had PRIV_NETINET_RAW at attach,
373 * and fall through into normal filter path if so.
374 */
375 if (!IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) &&
376 prison_check_ip4(inp->inp_cred, &ip->ip_dst) != 0)
377 goto skip_2;
378 }
379 /*
380 * If this raw socket has multicast state, and we
381 * have received a multicast, check if this socket
382 * should receive it, as multicast filtering is now
383 * the responsibility of the transport layer.
384 */
385 if (inp->inp_moptions != NULL &&
386 IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
387 /*
388 * If the incoming datagram is for IGMP, allow it
389 * through unconditionally to the raw socket.
390 *
391 * In the case of IGMPv2, we may not have explicitly
392 * joined the group, and may have set IFF_ALLMULTI
393 * on the interface. imo_multi_filter() may discard
394 * control traffic we actually need to see.
395 *
396 * Userland multicast routing daemons should continue
397 * filter the control traffic appropriately.
398 */
399 int blocked;
400
401 blocked = MCAST_PASS;
402 if (proto != IPPROTO_IGMP) {
403 struct sockaddr_in group;
404
405 bzero(&group, sizeof(struct sockaddr_in));
406 group.sin_len = sizeof(struct sockaddr_in);
407 group.sin_family = AF_INET;
408 group.sin_addr = ip->ip_dst;
409
410 blocked = imo_multi_filter(inp->inp_moptions,
411 ifp,
412 (struct sockaddr *)&group,
413 (struct sockaddr *)&ripsrc);
414 }
415
416 if (blocked != MCAST_PASS) {
417 IPSTAT_INC(ips_notmember);
418 goto skip_2;
419 }
420 }
421 last = inp;
422 continue;
423 skip_2:
424 INP_RUNLOCK(inp);
425 }
426 INP_INFO_RUNLOCK_ET(&V_ripcbinfo, et);
427 if (last != NULL) {
428 if (rip_append(last, ip, m, &ripsrc) != 0)
429 IPSTAT_INC(ips_delivered);
430 INP_RUNLOCK(last);
431 } else {
432 if (inetsw[ip_protox[ip->ip_p]].pr_input == rip_input) {
433 IPSTAT_INC(ips_noproto);
434 IPSTAT_DEC(ips_delivered);
435 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PROTOCOL, 0, 0);
436 } else {
437 m_freem(m);
438 }
439 }
440 return (IPPROTO_DONE);
441 }
442
443 /*
444 * Generate IP header and pass packet to ip_output. Tack on options user may
445 * have setup with control call.
446 */
447 int
rip_output(struct mbuf * m,struct socket * so,...)448 rip_output(struct mbuf *m, struct socket *so, ...)
449 {
450 struct ip *ip;
451 int error;
452 struct inpcb *inp = sotoinpcb(so);
453 va_list ap;
454 u_long dst;
455 int flags = ((so->so_options & SO_DONTROUTE) ? IP_ROUTETOIF : 0) |
456 IP_ALLOWBROADCAST;
457 int cnt, hlen;
458 u_char opttype, optlen, *cp;
459
460 va_start(ap, so);
461 dst = va_arg(ap, u_long);
462 va_end(ap);
463
464 /*
465 * If the user handed us a complete IP packet, use it. Otherwise,
466 * allocate an mbuf for a header and fill it in.
467 */
468 if ((inp->inp_flags & INP_HDRINCL) == 0) {
469 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) {
470 m_freem(m);
471 return(EMSGSIZE);
472 }
473 M_PREPEND(m, sizeof(struct ip), M_NOWAIT);
474 if (m == NULL)
475 return(ENOBUFS);
476
477 INP_RLOCK(inp);
478 ip = mtod(m, struct ip *);
479 ip->ip_tos = inp->inp_ip_tos;
480 if (inp->inp_flags & INP_DONTFRAG)
481 ip->ip_off = htons(IP_DF);
482 else
483 ip->ip_off = htons(0);
484 ip->ip_p = inp->inp_ip_p;
485 ip->ip_len = htons(m->m_pkthdr.len);
486 ip->ip_src = inp->inp_laddr;
487 ip->ip_dst.s_addr = dst;
488 if (jailed(inp->inp_cred)) {
489 /*
490 * prison_local_ip4() would be good enough but would
491 * let a source of INADDR_ANY pass, which we do not
492 * want to see from jails.
493 */
494 if (ip->ip_src.s_addr == INADDR_ANY) {
495 error = in_pcbladdr(inp, &ip->ip_dst, &ip->ip_src,
496 inp->inp_cred);
497 } else {
498 error = prison_local_ip4(inp->inp_cred,
499 &ip->ip_src);
500 }
501 if (error != 0) {
502 INP_RUNLOCK(inp);
503 m_freem(m);
504 return (error);
505 }
506 }
507 ip->ip_ttl = inp->inp_ip_ttl;
508 } else {
509 if (m->m_pkthdr.len > IP_MAXPACKET) {
510 m_freem(m);
511 return(EMSGSIZE);
512 }
513 ip = mtod(m, struct ip *);
514 hlen = ip->ip_hl << 2;
515 if (m->m_len < hlen) {
516 m = m_pullup(m, hlen);
517 if (m == NULL)
518 return (EINVAL);
519 ip = mtod(m, struct ip *);
520 }
521
522 INP_RLOCK(inp);
523 /*
524 * Don't allow both user specified and setsockopt options,
525 * and don't allow packet length sizes that will crash.
526 */
527 if ((hlen < sizeof (*ip))
528 || ((hlen > sizeof (*ip)) && inp->inp_options)
529 || (ntohs(ip->ip_len) != m->m_pkthdr.len)) {
530 INP_RUNLOCK(inp);
531 m_freem(m);
532 return (EINVAL);
533 }
534 error = prison_check_ip4(inp->inp_cred, &ip->ip_src);
535 if (error != 0) {
536 INP_RUNLOCK(inp);
537 m_freem(m);
538 return (error);
539 }
540 /*
541 * Don't allow IP options which do not have the required
542 * structure as specified in section 3.1 of RFC 791 on
543 * pages 15-23.
544 */
545 cp = (u_char *)(ip + 1);
546 cnt = hlen - sizeof (struct ip);
547 for (; cnt > 0; cnt -= optlen, cp += optlen) {
548 opttype = cp[IPOPT_OPTVAL];
549 if (opttype == IPOPT_EOL)
550 break;
551 if (opttype == IPOPT_NOP) {
552 optlen = 1;
553 continue;
554 }
555 if (cnt < IPOPT_OLEN + sizeof(u_char)) {
556 INP_RUNLOCK(inp);
557 m_freem(m);
558 return (EINVAL);
559 }
560 optlen = cp[IPOPT_OLEN];
561 if (optlen < IPOPT_OLEN + sizeof(u_char) ||
562 optlen > cnt) {
563 INP_RUNLOCK(inp);
564 m_freem(m);
565 return (EINVAL);
566 }
567 }
568 /*
569 * This doesn't allow application to specify ID of zero,
570 * but we got this limitation from the beginning of history.
571 */
572 if (ip->ip_id == 0)
573 ip_fillid(ip);
574
575 /*
576 * XXX prevent ip_output from overwriting header fields.
577 */
578 flags |= IP_RAWOUTPUT;
579 IPSTAT_INC(ips_rawout);
580 }
581
582 if (inp->inp_flags & INP_ONESBCAST)
583 flags |= IP_SENDONES;
584
585 #ifdef MAC
586 mac_inpcb_create_mbuf(inp, m);
587 #endif
588
589 error = ip_output(m, inp->inp_options, NULL, flags,
590 inp->inp_moptions, inp);
591 INP_RUNLOCK(inp);
592 return (error);
593 }
594
595 /*
596 * Raw IP socket option processing.
597 *
598 * IMPORTANT NOTE regarding access control: Traditionally, raw sockets could
599 * only be created by a privileged process, and as such, socket option
600 * operations to manage system properties on any raw socket were allowed to
601 * take place without explicit additional access control checks. However,
602 * raw sockets can now also be created in jail(), and therefore explicit
603 * checks are now required. Likewise, raw sockets can be used by a process
604 * after it gives up privilege, so some caution is required. For options
605 * passed down to the IP layer via ip_ctloutput(), checks are assumed to be
606 * performed in ip_ctloutput() and therefore no check occurs here.
607 * Unilaterally checking priv_check() here breaks normal IP socket option
608 * operations on raw sockets.
609 *
610 * When adding new socket options here, make sure to add access control
611 * checks here as necessary.
612 *
613 * XXX-BZ inp locking?
614 */
615 int
rip_ctloutput(struct socket * so,struct sockopt * sopt)616 rip_ctloutput(struct socket *so, struct sockopt *sopt)
617 {
618 struct inpcb *inp = sotoinpcb(so);
619 int error, optval;
620
621 if (sopt->sopt_level != IPPROTO_IP) {
622 if ((sopt->sopt_level == SOL_SOCKET) &&
623 (sopt->sopt_name == SO_SETFIB)) {
624 inp->inp_inc.inc_fibnum = so->so_fibnum;
625 return (0);
626 }
627 return (EINVAL);
628 }
629
630 error = 0;
631 switch (sopt->sopt_dir) {
632 case SOPT_GET:
633 switch (sopt->sopt_name) {
634 case IP_HDRINCL:
635 optval = inp->inp_flags & INP_HDRINCL;
636 error = sooptcopyout(sopt, &optval, sizeof optval);
637 break;
638
639 case IP_FW3: /* generic ipfw v.3 functions */
640 case IP_FW_ADD: /* ADD actually returns the body... */
641 case IP_FW_GET:
642 case IP_FW_TABLE_GETSIZE:
643 case IP_FW_TABLE_LIST:
644 case IP_FW_NAT_GET_CONFIG:
645 case IP_FW_NAT_GET_LOG:
646 if (V_ip_fw_ctl_ptr != NULL)
647 error = V_ip_fw_ctl_ptr(sopt);
648 else
649 error = ENOPROTOOPT;
650 break;
651
652 case IP_DUMMYNET3: /* generic dummynet v.3 functions */
653 case IP_DUMMYNET_GET:
654 if (ip_dn_ctl_ptr != NULL)
655 error = ip_dn_ctl_ptr(sopt);
656 else
657 error = ENOPROTOOPT;
658 break ;
659
660 case MRT_INIT:
661 case MRT_DONE:
662 case MRT_ADD_VIF:
663 case MRT_DEL_VIF:
664 case MRT_ADD_MFC:
665 case MRT_DEL_MFC:
666 case MRT_VERSION:
667 case MRT_ASSERT:
668 case MRT_API_SUPPORT:
669 case MRT_API_CONFIG:
670 case MRT_ADD_BW_UPCALL:
671 case MRT_DEL_BW_UPCALL:
672 error = priv_check(curthread, PRIV_NETINET_MROUTE);
673 if (error != 0)
674 return (error);
675 error = ip_mrouter_get ? ip_mrouter_get(so, sopt) :
676 EOPNOTSUPP;
677 break;
678
679 default:
680 error = ip_ctloutput(so, sopt);
681 break;
682 }
683 break;
684
685 case SOPT_SET:
686 switch (sopt->sopt_name) {
687 case IP_HDRINCL:
688 error = sooptcopyin(sopt, &optval, sizeof optval,
689 sizeof optval);
690 if (error)
691 break;
692 if (optval)
693 inp->inp_flags |= INP_HDRINCL;
694 else
695 inp->inp_flags &= ~INP_HDRINCL;
696 break;
697
698 case IP_FW3: /* generic ipfw v.3 functions */
699 case IP_FW_ADD:
700 case IP_FW_DEL:
701 case IP_FW_FLUSH:
702 case IP_FW_ZERO:
703 case IP_FW_RESETLOG:
704 case IP_FW_TABLE_ADD:
705 case IP_FW_TABLE_DEL:
706 case IP_FW_TABLE_FLUSH:
707 case IP_FW_NAT_CFG:
708 case IP_FW_NAT_DEL:
709 if (V_ip_fw_ctl_ptr != NULL)
710 error = V_ip_fw_ctl_ptr(sopt);
711 else
712 error = ENOPROTOOPT;
713 break;
714
715 case IP_DUMMYNET3: /* generic dummynet v.3 functions */
716 case IP_DUMMYNET_CONFIGURE:
717 case IP_DUMMYNET_DEL:
718 case IP_DUMMYNET_FLUSH:
719 if (ip_dn_ctl_ptr != NULL)
720 error = ip_dn_ctl_ptr(sopt);
721 else
722 error = ENOPROTOOPT ;
723 break ;
724
725 case IP_RSVP_ON:
726 error = priv_check(curthread, PRIV_NETINET_MROUTE);
727 if (error != 0)
728 return (error);
729 error = ip_rsvp_init(so);
730 break;
731
732 case IP_RSVP_OFF:
733 error = priv_check(curthread, PRIV_NETINET_MROUTE);
734 if (error != 0)
735 return (error);
736 error = ip_rsvp_done();
737 break;
738
739 case IP_RSVP_VIF_ON:
740 case IP_RSVP_VIF_OFF:
741 error = priv_check(curthread, PRIV_NETINET_MROUTE);
742 if (error != 0)
743 return (error);
744 error = ip_rsvp_vif ?
745 ip_rsvp_vif(so, sopt) : EINVAL;
746 break;
747
748 case MRT_INIT:
749 case MRT_DONE:
750 case MRT_ADD_VIF:
751 case MRT_DEL_VIF:
752 case MRT_ADD_MFC:
753 case MRT_DEL_MFC:
754 case MRT_VERSION:
755 case MRT_ASSERT:
756 case MRT_API_SUPPORT:
757 case MRT_API_CONFIG:
758 case MRT_ADD_BW_UPCALL:
759 case MRT_DEL_BW_UPCALL:
760 error = priv_check(curthread, PRIV_NETINET_MROUTE);
761 if (error != 0)
762 return (error);
763 error = ip_mrouter_set ? ip_mrouter_set(so, sopt) :
764 EOPNOTSUPP;
765 break;
766
767 default:
768 error = ip_ctloutput(so, sopt);
769 break;
770 }
771 break;
772 }
773
774 return (error);
775 }
776
777 /*
778 * This function exists solely to receive the PRC_IFDOWN messages which are
779 * sent by if_down(). It looks for an ifaddr whose ifa_addr is sa, and calls
780 * in_ifadown() to remove all routes corresponding to that address. It also
781 * receives the PRC_IFUP messages from if_up() and reinstalls the interface
782 * routes.
783 */
784 void
rip_ctlinput(int cmd,struct sockaddr * sa,void * vip)785 rip_ctlinput(int cmd, struct sockaddr *sa, void *vip)
786 {
787 struct rm_priotracker in_ifa_tracker;
788 struct in_ifaddr *ia;
789 struct ifnet *ifp;
790 int err;
791 int flags;
792
793 switch (cmd) {
794 case PRC_IFDOWN:
795 IN_IFADDR_RLOCK(&in_ifa_tracker);
796 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
797 if (ia->ia_ifa.ifa_addr == sa
798 && (ia->ia_flags & IFA_ROUTE)) {
799 ifa_ref(&ia->ia_ifa);
800 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
801 /*
802 * in_scrubprefix() kills the interface route.
803 */
804 in_scrubprefix(ia, 0);
805 /*
806 * in_ifadown gets rid of all the rest of the
807 * routes. This is not quite the right thing
808 * to do, but at least if we are running a
809 * routing process they will come back.
810 */
811 in_ifadown(&ia->ia_ifa, 0);
812 ifa_free(&ia->ia_ifa);
813 break;
814 }
815 }
816 if (ia == NULL) /* If ia matched, already unlocked. */
817 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
818 break;
819
820 case PRC_IFUP:
821 IN_IFADDR_RLOCK(&in_ifa_tracker);
822 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
823 if (ia->ia_ifa.ifa_addr == sa)
824 break;
825 }
826 if (ia == NULL || (ia->ia_flags & IFA_ROUTE)) {
827 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
828 return;
829 }
830 ifa_ref(&ia->ia_ifa);
831 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
832 flags = RTF_UP;
833 ifp = ia->ia_ifa.ifa_ifp;
834
835 if ((ifp->if_flags & IFF_LOOPBACK)
836 || (ifp->if_flags & IFF_POINTOPOINT))
837 flags |= RTF_HOST;
838
839 err = ifa_del_loopback_route((struct ifaddr *)ia, sa);
840
841 err = rtinit(&ia->ia_ifa, RTM_ADD, flags);
842 if (err == 0)
843 ia->ia_flags |= IFA_ROUTE;
844
845 err = ifa_add_loopback_route((struct ifaddr *)ia, sa);
846
847 ifa_free(&ia->ia_ifa);
848 break;
849 }
850 }
851
852 static int
rip_attach(struct socket * so,int proto,struct thread * td)853 rip_attach(struct socket *so, int proto, struct thread *td)
854 {
855 struct inpcb *inp;
856 int error;
857
858 inp = sotoinpcb(so);
859 KASSERT(inp == NULL, ("rip_attach: inp != NULL"));
860
861 error = priv_check(td, PRIV_NETINET_RAW);
862 if (error)
863 return (error);
864 if (proto >= IPPROTO_MAX || proto < 0)
865 return EPROTONOSUPPORT;
866 error = soreserve(so, rip_sendspace, rip_recvspace);
867 if (error)
868 return (error);
869 INP_INFO_WLOCK(&V_ripcbinfo);
870 error = in_pcballoc(so, &V_ripcbinfo);
871 if (error) {
872 INP_INFO_WUNLOCK(&V_ripcbinfo);
873 return (error);
874 }
875 inp = (struct inpcb *)so->so_pcb;
876 inp->inp_vflag |= INP_IPV4;
877 inp->inp_ip_p = proto;
878 inp->inp_ip_ttl = V_ip_defttl;
879 rip_inshash(inp);
880 INP_INFO_WUNLOCK(&V_ripcbinfo);
881 INP_WUNLOCK(inp);
882 return (0);
883 }
884
885 static void
rip_detach(struct socket * so)886 rip_detach(struct socket *so)
887 {
888 struct inpcb *inp;
889
890 inp = sotoinpcb(so);
891 KASSERT(inp != NULL, ("rip_detach: inp == NULL"));
892 KASSERT(inp->inp_faddr.s_addr == INADDR_ANY,
893 ("rip_detach: not closed"));
894
895 INP_INFO_WLOCK(&V_ripcbinfo);
896 INP_WLOCK(inp);
897 rip_delhash(inp);
898 if (so == V_ip_mrouter && ip_mrouter_done)
899 ip_mrouter_done();
900 if (ip_rsvp_force_done)
901 ip_rsvp_force_done(so);
902 if (so == V_ip_rsvpd)
903 ip_rsvp_done();
904 in_pcbdetach(inp);
905 in_pcbfree(inp);
906 INP_INFO_WUNLOCK(&V_ripcbinfo);
907 }
908
909 static void
rip_dodisconnect(struct socket * so,struct inpcb * inp)910 rip_dodisconnect(struct socket *so, struct inpcb *inp)
911 {
912 struct inpcbinfo *pcbinfo;
913
914 pcbinfo = inp->inp_pcbinfo;
915 INP_INFO_WLOCK(pcbinfo);
916 INP_WLOCK(inp);
917 rip_delhash(inp);
918 inp->inp_faddr.s_addr = INADDR_ANY;
919 rip_inshash(inp);
920 SOCK_LOCK(so);
921 so->so_state &= ~SS_ISCONNECTED;
922 SOCK_UNLOCK(so);
923 INP_WUNLOCK(inp);
924 INP_INFO_WUNLOCK(pcbinfo);
925 }
926
927 static void
rip_abort(struct socket * so)928 rip_abort(struct socket *so)
929 {
930 struct inpcb *inp;
931
932 inp = sotoinpcb(so);
933 KASSERT(inp != NULL, ("rip_abort: inp == NULL"));
934
935 rip_dodisconnect(so, inp);
936 }
937
938 static void
rip_close(struct socket * so)939 rip_close(struct socket *so)
940 {
941 struct inpcb *inp;
942
943 inp = sotoinpcb(so);
944 KASSERT(inp != NULL, ("rip_close: inp == NULL"));
945
946 rip_dodisconnect(so, inp);
947 }
948
949 static int
rip_disconnect(struct socket * so)950 rip_disconnect(struct socket *so)
951 {
952 struct inpcb *inp;
953
954 if ((so->so_state & SS_ISCONNECTED) == 0)
955 return (ENOTCONN);
956
957 inp = sotoinpcb(so);
958 KASSERT(inp != NULL, ("rip_disconnect: inp == NULL"));
959
960 rip_dodisconnect(so, inp);
961 return (0);
962 }
963
964 static int
rip_bind(struct socket * so,struct sockaddr * nam,struct thread * td)965 rip_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
966 {
967 struct sockaddr_in *addr = (struct sockaddr_in *)nam;
968 struct inpcb *inp;
969 int error;
970
971 if (nam->sa_len != sizeof(*addr))
972 return (EINVAL);
973
974 error = prison_check_ip4(td->td_ucred, &addr->sin_addr);
975 if (error != 0)
976 return (error);
977
978 inp = sotoinpcb(so);
979 KASSERT(inp != NULL, ("rip_bind: inp == NULL"));
980
981 if (CK_STAILQ_EMPTY(&V_ifnet) ||
982 (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) ||
983 (addr->sin_addr.s_addr &&
984 (inp->inp_flags & INP_BINDANY) == 0 &&
985 ifa_ifwithaddr_check((struct sockaddr *)addr) == 0))
986 return (EADDRNOTAVAIL);
987
988 INP_INFO_WLOCK(&V_ripcbinfo);
989 INP_WLOCK(inp);
990 rip_delhash(inp);
991 inp->inp_laddr = addr->sin_addr;
992 rip_inshash(inp);
993 INP_WUNLOCK(inp);
994 INP_INFO_WUNLOCK(&V_ripcbinfo);
995 return (0);
996 }
997
998 static int
rip_connect(struct socket * so,struct sockaddr * nam,struct thread * td)999 rip_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
1000 {
1001 struct sockaddr_in *addr = (struct sockaddr_in *)nam;
1002 struct inpcb *inp;
1003
1004 if (nam->sa_len != sizeof(*addr))
1005 return (EINVAL);
1006 if (CK_STAILQ_EMPTY(&V_ifnet))
1007 return (EADDRNOTAVAIL);
1008 if (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK)
1009 return (EAFNOSUPPORT);
1010
1011 inp = sotoinpcb(so);
1012 KASSERT(inp != NULL, ("rip_connect: inp == NULL"));
1013
1014 INP_INFO_WLOCK(&V_ripcbinfo);
1015 INP_WLOCK(inp);
1016 rip_delhash(inp);
1017 inp->inp_faddr = addr->sin_addr;
1018 rip_inshash(inp);
1019 soisconnected(so);
1020 INP_WUNLOCK(inp);
1021 INP_INFO_WUNLOCK(&V_ripcbinfo);
1022 return (0);
1023 }
1024
1025 static int
rip_shutdown(struct socket * so)1026 rip_shutdown(struct socket *so)
1027 {
1028 struct inpcb *inp;
1029
1030 inp = sotoinpcb(so);
1031 KASSERT(inp != NULL, ("rip_shutdown: inp == NULL"));
1032
1033 INP_WLOCK(inp);
1034 socantsendmore(so);
1035 INP_WUNLOCK(inp);
1036 return (0);
1037 }
1038
1039 static int
rip_send(struct socket * so,int flags,struct mbuf * m,struct sockaddr * nam,struct mbuf * control,struct thread * td)1040 rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
1041 struct mbuf *control, struct thread *td)
1042 {
1043 struct inpcb *inp;
1044 u_long dst;
1045
1046 inp = sotoinpcb(so);
1047 KASSERT(inp != NULL, ("rip_send: inp == NULL"));
1048
1049 /*
1050 * Note: 'dst' reads below are unlocked.
1051 */
1052 if (so->so_state & SS_ISCONNECTED) {
1053 if (nam) {
1054 m_freem(m);
1055 return (EISCONN);
1056 }
1057 dst = inp->inp_faddr.s_addr; /* Unlocked read. */
1058 } else {
1059 if (nam == NULL) {
1060 m_freem(m);
1061 return (ENOTCONN);
1062 }
1063 dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr;
1064 }
1065 return (rip_output(m, so, dst));
1066 }
1067 #endif /* INET */
1068
1069 static int
rip_pcblist(SYSCTL_HANDLER_ARGS)1070 rip_pcblist(SYSCTL_HANDLER_ARGS)
1071 {
1072 int error, i, n;
1073 struct inpcb *inp, **inp_list;
1074 inp_gen_t gencnt;
1075 struct xinpgen xig;
1076 struct epoch_tracker et;
1077
1078 /*
1079 * The process of preparing the TCB list is too time-consuming and
1080 * resource-intensive to repeat twice on every request.
1081 */
1082 if (req->oldptr == 0) {
1083 n = V_ripcbinfo.ipi_count;
1084 n += imax(n / 8, 10);
1085 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb);
1086 return (0);
1087 }
1088
1089 if (req->newptr != 0)
1090 return (EPERM);
1091
1092 /*
1093 * OK, now we're committed to doing something.
1094 */
1095 INP_INFO_WLOCK(&V_ripcbinfo);
1096 gencnt = V_ripcbinfo.ipi_gencnt;
1097 n = V_ripcbinfo.ipi_count;
1098 INP_INFO_WUNLOCK(&V_ripcbinfo);
1099
1100 bzero(&xig, sizeof(xig));
1101 xig.xig_len = sizeof xig;
1102 xig.xig_count = n;
1103 xig.xig_gen = gencnt;
1104 xig.xig_sogen = so_gencnt;
1105 error = SYSCTL_OUT(req, &xig, sizeof xig);
1106 if (error)
1107 return (error);
1108
1109 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
1110
1111 INP_INFO_RLOCK_ET(&V_ripcbinfo, et);
1112 for (inp = CK_LIST_FIRST(V_ripcbinfo.ipi_listhead), i = 0; inp && i < n;
1113 inp = CK_LIST_NEXT(inp, inp_list)) {
1114 INP_WLOCK(inp);
1115 if (inp->inp_gencnt <= gencnt &&
1116 cr_canseeinpcb(req->td->td_ucred, inp) == 0) {
1117 in_pcbref(inp);
1118 inp_list[i++] = inp;
1119 }
1120 INP_WUNLOCK(inp);
1121 }
1122 INP_INFO_RUNLOCK_ET(&V_ripcbinfo, et);
1123 n = i;
1124
1125 error = 0;
1126 for (i = 0; i < n; i++) {
1127 inp = inp_list[i];
1128 INP_RLOCK(inp);
1129 if (inp->inp_gencnt <= gencnt) {
1130 struct xinpcb xi;
1131
1132 in_pcbtoxinpcb(inp, &xi);
1133 INP_RUNLOCK(inp);
1134 error = SYSCTL_OUT(req, &xi, sizeof xi);
1135 } else
1136 INP_RUNLOCK(inp);
1137 }
1138 INP_INFO_WLOCK(&V_ripcbinfo);
1139 for (i = 0; i < n; i++) {
1140 inp = inp_list[i];
1141 INP_RLOCK(inp);
1142 if (!in_pcbrele_rlocked(inp))
1143 INP_RUNLOCK(inp);
1144 }
1145 INP_INFO_WUNLOCK(&V_ripcbinfo);
1146
1147 if (!error) {
1148 struct epoch_tracker et;
1149 /*
1150 * Give the user an updated idea of our state. If the
1151 * generation differs from what we told her before, she knows
1152 * that something happened while we were processing this
1153 * request, and it might be necessary to retry.
1154 */
1155 INP_INFO_RLOCK_ET(&V_ripcbinfo, et);
1156 xig.xig_gen = V_ripcbinfo.ipi_gencnt;
1157 xig.xig_sogen = so_gencnt;
1158 xig.xig_count = V_ripcbinfo.ipi_count;
1159 INP_INFO_RUNLOCK_ET(&V_ripcbinfo, et);
1160 error = SYSCTL_OUT(req, &xig, sizeof xig);
1161 }
1162 free(inp_list, M_TEMP);
1163 return (error);
1164 }
1165
1166 SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist,
1167 CTLTYPE_OPAQUE | CTLFLAG_RD, NULL, 0,
1168 rip_pcblist, "S,xinpcb", "List of active raw IP sockets");
1169
1170 #ifdef INET
1171 struct pr_usrreqs rip_usrreqs = {
1172 .pru_abort = rip_abort,
1173 .pru_attach = rip_attach,
1174 .pru_bind = rip_bind,
1175 .pru_connect = rip_connect,
1176 .pru_control = in_control,
1177 .pru_detach = rip_detach,
1178 .pru_disconnect = rip_disconnect,
1179 .pru_peeraddr = in_getpeeraddr,
1180 .pru_send = rip_send,
1181 .pru_shutdown = rip_shutdown,
1182 .pru_sockaddr = in_getsockaddr,
1183 .pru_sosetlabel = in_pcbsosetlabel,
1184 .pru_close = rip_close,
1185 };
1186 #endif /* INET */
1187