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
33 #include "opt_inet.h"
34 #include "opt_inet6.h"
35 #include "opt_ipsec.h"
36 #include "opt_route.h"
37
38 #include <sys/param.h>
39 #include <sys/jail.h>
40 #include <sys/kernel.h>
41 #include <sys/eventhandler.h>
42 #include <sys/lock.h>
43 #include <sys/malloc.h>
44 #include <sys/mbuf.h>
45 #include <sys/priv.h>
46 #include <sys/proc.h>
47 #include <sys/protosw.h>
48 #include <sys/rwlock.h>
49 #include <sys/signalvar.h>
50 #include <sys/socket.h>
51 #include <sys/socketvar.h>
52 #include <sys/stdarg.h>
53 #include <sys/sx.h>
54 #include <sys/sysctl.h>
55 #include <sys/systm.h>
56
57 #include <vm/uma.h>
58
59 #include <net/if.h>
60 #include <net/if_var.h>
61 #include <net/route.h>
62 #include <net/route/route_ctl.h>
63 #include <net/vnet.h>
64
65 #include <netinet/in.h>
66 #include <netinet/in_systm.h>
67 #include <netinet/in_fib.h>
68 #include <netinet/in_pcb.h>
69 #include <netinet/in_var.h>
70 #include <netinet/if_ether.h>
71 #include <netinet/ip.h>
72 #include <netinet/ip_var.h>
73 #include <netinet/ip_mroute.h>
74 #include <netinet/ip_icmp.h>
75
76 #include <netipsec/ipsec_support.h>
77
78 #include <security/mac/mac_framework.h>
79
80 extern ipproto_input_t *ip_protox[];
81
82 VNET_DEFINE(int, ip_defttl) = IPDEFTTL;
83 SYSCTL_INT(_net_inet_ip, IPCTL_DEFTTL, ttl, CTLFLAG_VNET | CTLFLAG_RW,
84 &VNET_NAME(ip_defttl), 0,
85 "Maximum TTL on IP packets");
86
87 VNET_DEFINE(struct inpcbinfo, ripcbinfo);
88 #define V_ripcbinfo VNET(ripcbinfo)
89
90 /*
91 * Control and data hooks for ipfw, dummynet, divert and so on.
92 * The data hooks are not used here but it is convenient
93 * to keep them all in one place.
94 */
95 VNET_DEFINE(ip_fw_ctl_ptr_t, ip_fw_ctl_ptr) = NULL;
96
97 int (*ip_dn_ctl_ptr)(struct sockopt *);
98 int (*ip_dn_io_ptr)(struct mbuf **, struct ip_fw_args *);
99 void (*ip_divert_ptr)(struct mbuf *, bool);
100 int (*ng_ipfw_input_p)(struct mbuf **, struct ip_fw_args *, bool);
101
102 #ifdef INET
103 /*
104 * Hooks for multicast routing. They all default to NULL, so leave them not
105 * initialized and rely on BSS being set to 0.
106 */
107
108 /*
109 * The socket used to communicate with the multicast routing daemon.
110 */
111 VNET_DEFINE(struct socket *, ip_mrouter);
112
113 /*
114 * The various mrouter and rsvp functions.
115 */
116 int (*ip_mrouter_set)(struct socket *, struct sockopt *);
117 int (*ip_mrouter_get)(struct socket *, struct sockopt *);
118 int (*ip_mrouter_done)(void);
119 int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
120 struct ip_moptions *);
121 int (*mrt_ioctl)(u_long, caddr_t, int);
122 int (*legal_vif_num)(int);
123 u_long (*ip_mcast_src)(int);
124
125 int (*rsvp_input_p)(struct mbuf **, int *, int);
126 int (*ip_rsvp_vif)(struct socket *, struct sockopt *);
127 void (*ip_rsvp_force_done)(struct socket *);
128 #endif /* INET */
129
130 #define V_rip_bind_all_fibs VNET(rip_bind_all_fibs)
131 VNET_DEFINE(int, rip_bind_all_fibs) = 1;
132 SYSCTL_INT(_net_inet_raw, OID_AUTO, bind_all_fibs, CTLFLAG_VNET | CTLFLAG_RDTUN,
133 &VNET_NAME(rip_bind_all_fibs), 0,
134 "Bound sockets receive traffic from all FIBs");
135
136 u_long rip_sendspace = 9216;
137 SYSCTL_ULONG(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW,
138 &rip_sendspace, 0, "Maximum outgoing raw IP datagram size");
139
140 u_long rip_recvspace = 9216;
141 SYSCTL_ULONG(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW,
142 &rip_recvspace, 0, "Maximum space for incoming raw IP datagrams");
143
144 /*
145 * Hash functions
146 */
147
148 #define INP_PCBHASH_RAW_SIZE 256
149 #define INP_PCBHASH_RAW(proto, laddr, faddr, mask) \
150 (((proto) + (laddr) + (faddr)) % (mask) + 1)
151
152 #ifdef INET
153 static void
rip_inshash(struct inpcb * inp)154 rip_inshash(struct inpcb *inp)
155 {
156 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
157 struct inpcbhead *pcbhash;
158 int hash;
159
160 INP_HASH_WLOCK_ASSERT(pcbinfo);
161 INP_WLOCK_ASSERT(inp);
162
163 if (inp->inp_ip_p != 0 &&
164 inp->inp_laddr.s_addr != INADDR_ANY &&
165 inp->inp_faddr.s_addr != INADDR_ANY) {
166 hash = INP_PCBHASH_RAW(inp->inp_ip_p, inp->inp_laddr.s_addr,
167 inp->inp_faddr.s_addr, pcbinfo->ipi_hashmask);
168 } else
169 hash = 0;
170 pcbhash = &pcbinfo->ipi_hash_exact[hash];
171 CK_LIST_INSERT_HEAD(pcbhash, inp, inp_hash_exact);
172 }
173
174 static void
rip_delhash(struct inpcb * inp)175 rip_delhash(struct inpcb *inp)
176 {
177
178 INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
179 INP_WLOCK_ASSERT(inp);
180
181 CK_LIST_REMOVE(inp, inp_hash_exact);
182 }
183 #endif /* INET */
184
185 INPCBSTORAGE_DEFINE(ripcbstor, inpcb, "rawinp", "ripcb", "rip", "riphash");
186
187 static void
rip_init(void * arg __unused)188 rip_init(void *arg __unused)
189 {
190
191 in_pcbinfo_init(&V_ripcbinfo, &ripcbstor, INP_PCBHASH_RAW_SIZE, 1);
192 }
193 VNET_SYSINIT(rip_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, rip_init, NULL);
194
195 #ifdef VIMAGE
196 static void
rip_destroy(void * unused __unused)197 rip_destroy(void *unused __unused)
198 {
199
200 in_pcbinfo_destroy(&V_ripcbinfo);
201 }
202 VNET_SYSUNINIT(raw_ip, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, rip_destroy, NULL);
203 #endif
204
205 #ifdef INET
206 static int
rip_append(struct inpcb * inp,struct ip * ip,struct mbuf * m,struct sockaddr_in * ripsrc)207 rip_append(struct inpcb *inp, struct ip *ip, struct mbuf *m,
208 struct sockaddr_in *ripsrc)
209 {
210 struct socket *so = inp->inp_socket;
211 struct mbuf *n, *opts = NULL;
212
213 INP_LOCK_ASSERT(inp);
214
215 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
216 /* check AH/ESP integrity. */
217 if (IPSEC_ENABLED(ipv4) && IPSEC_CHECK_POLICY(ipv4, m, inp) != 0)
218 return (0);
219 #endif /* IPSEC */
220 #ifdef MAC
221 if (mac_inpcb_check_deliver(inp, m) != 0)
222 return (0);
223 #endif
224 /* Check the minimum TTL for socket. */
225 if (inp->inp_ip_minttl && inp->inp_ip_minttl > ip->ip_ttl)
226 return (0);
227
228 if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL)
229 return (0);
230
231 if ((inp->inp_flags & INP_CONTROLOPTS) ||
232 (so->so_options & (SO_TIMESTAMP | SO_BINTIME)))
233 ip_savecontrol(inp, &opts, ip, n);
234 SOCKBUF_LOCK(&so->so_rcv);
235 if (sbappendaddr_locked(&so->so_rcv,
236 (struct sockaddr *)ripsrc, n, opts) == 0) {
237 soroverflow_locked(so);
238 m_freem(n);
239 if (opts)
240 m_freem(opts);
241 return (0);
242 }
243 sorwakeup_locked(so);
244
245 return (1);
246 }
247
248 struct rip_inp_match_ctx {
249 struct ip *ip;
250 int proto;
251 };
252
253 static bool
rip_inp_match1(const struct inpcb * inp,void * v)254 rip_inp_match1(const struct inpcb *inp, void *v)
255 {
256 struct rip_inp_match_ctx *ctx = v;
257
258 if (inp->inp_ip_p != ctx->proto)
259 return (false);
260 #ifdef INET6
261 /* XXX inp locking */
262 if ((inp->inp_vflag & INP_IPV4) == 0)
263 return (false);
264 #endif
265 if (inp->inp_laddr.s_addr != ctx->ip->ip_dst.s_addr)
266 return (false);
267 if (inp->inp_faddr.s_addr != ctx->ip->ip_src.s_addr)
268 return (false);
269 return (true);
270 }
271
272 static bool
rip_inp_match2(const struct inpcb * inp,void * v)273 rip_inp_match2(const struct inpcb *inp, void *v)
274 {
275 struct rip_inp_match_ctx *ctx = v;
276
277 if (inp->inp_ip_p && inp->inp_ip_p != ctx->proto)
278 return (false);
279 #ifdef INET6
280 /* XXX inp locking */
281 if ((inp->inp_vflag & INP_IPV4) == 0)
282 return (false);
283 #endif
284 if (!in_nullhost(inp->inp_laddr) &&
285 !in_hosteq(inp->inp_laddr, ctx->ip->ip_dst))
286 return (false);
287 if (!in_nullhost(inp->inp_faddr) &&
288 !in_hosteq(inp->inp_faddr, ctx->ip->ip_src))
289 return (false);
290 return (true);
291 }
292
293 /*
294 * Setup generic address and protocol structures for raw_input routine, then
295 * pass them along with mbuf chain.
296 */
297 int
rip_input(struct mbuf ** mp,int * offp,int proto)298 rip_input(struct mbuf **mp, int *offp, int proto)
299 {
300 struct rip_inp_match_ctx ctx = {
301 .ip = mtod(*mp, struct ip *),
302 .proto = proto,
303 };
304 struct inpcb_iterator inpi = INP_ITERATOR(&V_ripcbinfo,
305 INPLOOKUP_RLOCKPCB, rip_inp_match1, &ctx);
306 struct ifnet *ifp;
307 struct mbuf *m = *mp;
308 struct inpcb *inp;
309 struct sockaddr_in ripsrc;
310 int appended, fib;
311
312 M_ASSERTPKTHDR(m);
313
314 *mp = NULL;
315 appended = 0;
316
317 bzero(&ripsrc, sizeof(ripsrc));
318 ripsrc.sin_len = sizeof(ripsrc);
319 ripsrc.sin_family = AF_INET;
320 ripsrc.sin_addr = ctx.ip->ip_src;
321
322 fib = M_GETFIB(m);
323 ifp = m->m_pkthdr.rcvif;
324
325 inpi.hash = INP_PCBHASH_RAW(proto, ctx.ip->ip_src.s_addr,
326 ctx.ip->ip_dst.s_addr, V_ripcbinfo.ipi_hashmask);
327 while ((inp = inp_next(&inpi)) != NULL) {
328 INP_RLOCK_ASSERT(inp);
329 if (jailed_without_vnet(inp->inp_cred) &&
330 prison_check_ip4(inp->inp_cred, &ctx.ip->ip_dst) != 0) {
331 /*
332 * XXX: If faddr was bound to multicast group,
333 * jailed raw socket will drop datagram.
334 */
335 continue;
336 }
337 if (V_rip_bind_all_fibs == 0 && fib != inp->inp_inc.inc_fibnum)
338 /*
339 * Sockets bound to a specific FIB can only receive
340 * packets from that FIB.
341 */
342 continue;
343 appended += rip_append(inp, ctx.ip, m, &ripsrc);
344 }
345
346 inpi.hash = 0;
347 inpi.match = rip_inp_match2;
348 MPASS(inpi.inp == NULL);
349 while ((inp = inp_next(&inpi)) != NULL) {
350 INP_RLOCK_ASSERT(inp);
351 if (jailed_without_vnet(inp->inp_cred) &&
352 !IN_MULTICAST(ntohl(ctx.ip->ip_dst.s_addr)) &&
353 prison_check_ip4(inp->inp_cred, &ctx.ip->ip_dst) != 0)
354 /*
355 * Allow raw socket in jail to receive multicast;
356 * assume process had PRIV_NETINET_RAW at attach,
357 * and fall through into normal filter path if so.
358 */
359 continue;
360 if (V_rip_bind_all_fibs == 0 && fib != inp->inp_inc.inc_fibnum)
361 continue;
362
363 /*
364 * If this raw socket has multicast state, and we
365 * have received a multicast, check if this socket
366 * should receive it, as multicast filtering is now
367 * the responsibility of the transport layer.
368 */
369 if (inp->inp_moptions != NULL &&
370 IN_MULTICAST(ntohl(ctx.ip->ip_dst.s_addr))) {
371 /*
372 * If the incoming datagram is for IGMP, allow it
373 * through unconditionally to the raw socket.
374 *
375 * In the case of IGMPv2, we may not have explicitly
376 * joined the group, and may have set IFF_ALLMULTI
377 * on the interface. imo_multi_filter() may discard
378 * control traffic we actually need to see.
379 *
380 * Userland multicast routing daemons should continue
381 * filter the control traffic appropriately.
382 */
383 int blocked;
384
385 blocked = MCAST_PASS;
386 if (proto != IPPROTO_IGMP) {
387 struct sockaddr_in group;
388
389 bzero(&group, sizeof(struct sockaddr_in));
390 group.sin_len = sizeof(struct sockaddr_in);
391 group.sin_family = AF_INET;
392 group.sin_addr = ctx.ip->ip_dst;
393
394 blocked = imo_multi_filter(inp->inp_moptions,
395 ifp,
396 (struct sockaddr *)&group,
397 (struct sockaddr *)&ripsrc);
398 }
399
400 if (blocked != MCAST_PASS) {
401 IPSTAT_INC(ips_notmember);
402 continue;
403 }
404 }
405 appended += rip_append(inp, ctx.ip, m, &ripsrc);
406 }
407 if (appended == 0 && ip_protox[ctx.ip->ip_p] == rip_input) {
408 IPSTAT_INC(ips_noproto);
409 IPSTAT_DEC(ips_delivered);
410 icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PROTOCOL, 0, 0);
411 } else
412 m_freem(m);
413 return (IPPROTO_DONE);
414 }
415
416 /*
417 * Generate IP header and pass packet to ip_output. Tack on options user may
418 * have setup with control call.
419 */
420 static int
rip_send(struct socket * so,int pruflags,struct mbuf * m,struct sockaddr * nam,struct mbuf * control,struct thread * td)421 rip_send(struct socket *so, int pruflags, struct mbuf *m, struct sockaddr *nam,
422 struct mbuf *control, struct thread *td)
423 {
424 struct epoch_tracker et;
425 struct ip *ip;
426 struct inpcb *inp;
427 in_addr_t *dst;
428 int error, flags, cnt, hlen;
429 u_char opttype, optlen, *cp;
430
431 inp = sotoinpcb(so);
432 KASSERT(inp != NULL, ("rip_send: inp == NULL"));
433
434 if (control != NULL) {
435 m_freem(control);
436 control = NULL;
437 }
438
439 if (so->so_state & SS_ISCONNECTED) {
440 if (nam) {
441 error = EISCONN;
442 m_freem(m);
443 return (error);
444 }
445 dst = &inp->inp_faddr.s_addr;
446 } else {
447 if (nam == NULL)
448 error = ENOTCONN;
449 else if (nam->sa_family != AF_INET)
450 error = EAFNOSUPPORT;
451 else if (nam->sa_len != sizeof(struct sockaddr_in))
452 error = EINVAL;
453 else
454 error = 0;
455 if (error != 0) {
456 m_freem(m);
457 return (error);
458 }
459 dst = &((struct sockaddr_in *)nam)->sin_addr.s_addr;
460 }
461
462 flags = ((so->so_options & SO_DONTROUTE) ? IP_ROUTETOIF : 0) |
463 IP_ALLOWBROADCAST;
464
465 /*
466 * If the user handed us a complete IP packet, use it. Otherwise,
467 * allocate an mbuf for a header and fill it in.
468 */
469 if ((inp->inp_flags & INP_HDRINCL) == 0) {
470 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) {
471 m_freem(m);
472 return(EMSGSIZE);
473 }
474 M_PREPEND(m, sizeof(struct ip), M_NOWAIT);
475 if (m == NULL)
476 return(ENOBUFS);
477
478 INP_RLOCK(inp);
479 ip = mtod(m, struct ip *);
480 ip->ip_tos = inp->inp_ip_tos;
481 if (inp->inp_flags & INP_DONTFRAG)
482 ip->ip_off = htons(IP_DF);
483 else
484 ip->ip_off = htons(0);
485 ip->ip_p = inp->inp_ip_p;
486 ip->ip_len = htons(m->m_pkthdr.len);
487 ip->ip_src = inp->inp_laddr;
488 ip->ip_dst.s_addr = *dst;
489 #ifdef ROUTE_MPATH
490 if (CALC_FLOWID_OUTBOUND) {
491 uint32_t hash_type, hash_val;
492
493 hash_val = fib4_calc_software_hash(ip->ip_src,
494 ip->ip_dst, 0, 0, ip->ip_p, &hash_type);
495 m->m_pkthdr.flowid = hash_val;
496 M_HASHTYPE_SET(m, hash_type);
497 flags |= IP_NODEFAULTFLOWID;
498 }
499 #endif
500 if (jailed(inp->inp_cred)) {
501 /*
502 * prison_local_ip4() would be good enough but would
503 * let a source of INADDR_ANY pass, which we do not
504 * want to see from jails.
505 */
506 if (ip->ip_src.s_addr == INADDR_ANY) {
507 NET_EPOCH_ENTER(et);
508 error = in_pcbladdr(inp, &ip->ip_dst,
509 &ip->ip_src, inp->inp_cred);
510 NET_EPOCH_EXIT(et);
511 } else {
512 error = prison_local_ip4(inp->inp_cred,
513 &ip->ip_src);
514 }
515 if (error != 0) {
516 INP_RUNLOCK(inp);
517 m_freem(m);
518 return (error);
519 }
520 }
521 ip->ip_ttl = inp->inp_ip_ttl;
522 } else {
523 if (m->m_pkthdr.len > IP_MAXPACKET) {
524 m_freem(m);
525 return (EMSGSIZE);
526 }
527 if (m->m_pkthdr.len < sizeof(*ip)) {
528 m_freem(m);
529 return (EINVAL);
530 }
531 m = m_pullup(m, sizeof(*ip));
532 if (m == NULL)
533 return (ENOMEM);
534 ip = mtod(m, struct ip *);
535 hlen = ip->ip_hl << 2;
536 if (m->m_len < hlen) {
537 m = m_pullup(m, hlen);
538 if (m == NULL)
539 return (EINVAL);
540 ip = mtod(m, struct ip *);
541 }
542 #ifdef ROUTE_MPATH
543 if (CALC_FLOWID_OUTBOUND) {
544 uint32_t hash_type, hash_val;
545
546 hash_val = fib4_calc_software_hash(ip->ip_dst,
547 ip->ip_src, 0, 0, ip->ip_p, &hash_type);
548 m->m_pkthdr.flowid = hash_val;
549 M_HASHTYPE_SET(m, hash_type);
550 flags |= IP_NODEFAULTFLOWID;
551 }
552 #endif
553 INP_RLOCK(inp);
554 /*
555 * Don't allow both user specified and setsockopt options,
556 * and don't allow packet length sizes that will crash.
557 */
558 if ((hlen < sizeof (*ip))
559 || ((hlen > sizeof (*ip)) && inp->inp_options)
560 || (ntohs(ip->ip_len) != m->m_pkthdr.len)) {
561 INP_RUNLOCK(inp);
562 m_freem(m);
563 return (EINVAL);
564 }
565 error = prison_check_ip4(inp->inp_cred, &ip->ip_src);
566 if (error != 0) {
567 INP_RUNLOCK(inp);
568 m_freem(m);
569 return (error);
570 }
571 /*
572 * Don't allow IP options which do not have the required
573 * structure as specified in section 3.1 of RFC 791 on
574 * pages 15-23.
575 */
576 cp = (u_char *)(ip + 1);
577 cnt = hlen - sizeof (struct ip);
578 for (; cnt > 0; cnt -= optlen, cp += optlen) {
579 opttype = cp[IPOPT_OPTVAL];
580 if (opttype == IPOPT_EOL)
581 break;
582 if (opttype == IPOPT_NOP) {
583 optlen = 1;
584 continue;
585 }
586 if (cnt < IPOPT_OLEN + sizeof(u_char)) {
587 INP_RUNLOCK(inp);
588 m_freem(m);
589 return (EINVAL);
590 }
591 optlen = cp[IPOPT_OLEN];
592 if (optlen < IPOPT_OLEN + sizeof(u_char) ||
593 optlen > cnt) {
594 INP_RUNLOCK(inp);
595 m_freem(m);
596 return (EINVAL);
597 }
598 }
599 /*
600 * This doesn't allow application to specify ID of zero,
601 * but we got this limitation from the beginning of history.
602 */
603 if (ip->ip_id == 0)
604 ip_fillid(ip, V_ip_random_id);
605
606 /*
607 * XXX prevent ip_output from overwriting header fields.
608 */
609 flags |= IP_RAWOUTPUT;
610 IPSTAT_INC(ips_rawout);
611 }
612
613 if (inp->inp_flags & INP_ONESBCAST)
614 flags |= IP_SENDONES;
615
616 #ifdef MAC
617 mac_inpcb_create_mbuf(inp, m);
618 #endif
619
620 NET_EPOCH_ENTER(et);
621 error = ip_output(m, inp->inp_options, NULL, flags,
622 inp->inp_moptions, inp);
623 NET_EPOCH_EXIT(et);
624 INP_RUNLOCK(inp);
625 return (error);
626 }
627
628 /*
629 * Raw IP socket option processing.
630 *
631 * IMPORTANT NOTE regarding access control: Traditionally, raw sockets could
632 * only be created by a privileged process, and as such, socket option
633 * operations to manage system properties on any raw socket were allowed to
634 * take place without explicit additional access control checks. However,
635 * raw sockets can now also be created in jail(), and therefore explicit
636 * checks are now required. Likewise, raw sockets can be used by a process
637 * after it gives up privilege, so some caution is required. For options
638 * passed down to the IP layer via ip_ctloutput(), checks are assumed to be
639 * performed in ip_ctloutput() and therefore no check occurs here.
640 * Unilaterally checking priv_check() here breaks normal IP socket option
641 * operations on raw sockets.
642 *
643 * When adding new socket options here, make sure to add access control
644 * checks here as necessary.
645 */
646 int
rip_ctloutput(struct socket * so,struct sockopt * sopt)647 rip_ctloutput(struct socket *so, struct sockopt *sopt)
648 {
649 struct inpcb *inp = sotoinpcb(so);
650 int error, optval;
651
652 if (sopt->sopt_level != IPPROTO_IP) {
653 if (sopt->sopt_dir == SOPT_SET &&
654 sopt->sopt_level == SOL_SOCKET &&
655 sopt->sopt_name == SO_SETFIB)
656 return (ip_ctloutput(so, sopt));
657 return (EINVAL);
658 }
659
660 error = 0;
661 switch (sopt->sopt_dir) {
662 case SOPT_GET:
663 switch (sopt->sopt_name) {
664 case IP_HDRINCL:
665 optval = inp->inp_flags & INP_HDRINCL;
666 error = sooptcopyout(sopt, &optval, sizeof optval);
667 break;
668
669 case IP_FW3: /* generic ipfw v.3 functions */
670 case IP_FW_ADD: /* ADD actually returns the body... */
671 case IP_FW_GET:
672 case IP_FW_TABLE_GETSIZE:
673 case IP_FW_TABLE_LIST:
674 case IP_FW_NAT_GET_CONFIG:
675 case IP_FW_NAT_GET_LOG:
676 if (V_ip_fw_ctl_ptr != NULL)
677 error = V_ip_fw_ctl_ptr(sopt);
678 else
679 error = ENOPROTOOPT;
680 break;
681
682 case IP_DUMMYNET3: /* generic dummynet v.3 functions */
683 if (ip_dn_ctl_ptr != NULL)
684 error = ip_dn_ctl_ptr(sopt);
685 else
686 error = ENOPROTOOPT;
687 break ;
688
689 case MRT_INIT:
690 case MRT_DONE:
691 case MRT_ADD_VIF:
692 case MRT_DEL_VIF:
693 case MRT_ADD_MFC:
694 case MRT_DEL_MFC:
695 case MRT_VERSION:
696 case MRT_ASSERT:
697 case MRT_API_SUPPORT:
698 case MRT_API_CONFIG:
699 case MRT_ADD_BW_UPCALL:
700 case MRT_DEL_BW_UPCALL:
701 error = priv_check(curthread, PRIV_NETINET_MROUTE);
702 if (error != 0)
703 return (error);
704 if (inp->inp_ip_p != IPPROTO_IGMP)
705 return (EOPNOTSUPP);
706 error = ip_mrouter_get ? ip_mrouter_get(so, sopt) :
707 EOPNOTSUPP;
708 break;
709
710 default:
711 error = ip_ctloutput(so, sopt);
712 break;
713 }
714 break;
715
716 case SOPT_SET:
717 switch (sopt->sopt_name) {
718 case IP_HDRINCL:
719 error = sooptcopyin(sopt, &optval, sizeof optval,
720 sizeof optval);
721 if (error)
722 break;
723 INP_WLOCK(inp);
724 if (optval)
725 inp->inp_flags |= INP_HDRINCL;
726 else
727 inp->inp_flags &= ~INP_HDRINCL;
728 INP_WUNLOCK(inp);
729 break;
730
731 case IP_FW3: /* generic ipfw v.3 functions */
732 case IP_FW_ADD:
733 case IP_FW_DEL:
734 case IP_FW_FLUSH:
735 case IP_FW_ZERO:
736 case IP_FW_RESETLOG:
737 case IP_FW_TABLE_ADD:
738 case IP_FW_TABLE_DEL:
739 case IP_FW_TABLE_FLUSH:
740 case IP_FW_NAT_CFG:
741 case IP_FW_NAT_DEL:
742 if (V_ip_fw_ctl_ptr != NULL)
743 error = V_ip_fw_ctl_ptr(sopt);
744 else
745 error = ENOPROTOOPT;
746 break;
747
748 case IP_DUMMYNET3: /* generic dummynet v.3 functions */
749 if (ip_dn_ctl_ptr != NULL)
750 error = ip_dn_ctl_ptr(sopt);
751 else
752 error = ENOPROTOOPT ;
753 break ;
754
755 case IP_RSVP_ON:
756 error = priv_check(curthread, PRIV_NETINET_MROUTE);
757 if (error != 0)
758 return (error);
759 if (inp->inp_ip_p != IPPROTO_RSVP)
760 return (EOPNOTSUPP);
761 error = ip_rsvp_init(so);
762 break;
763
764 case IP_RSVP_OFF:
765 error = priv_check(curthread, PRIV_NETINET_MROUTE);
766 if (error != 0)
767 return (error);
768 error = ip_rsvp_done();
769 break;
770
771 case IP_RSVP_VIF_ON:
772 case IP_RSVP_VIF_OFF:
773 error = priv_check(curthread, PRIV_NETINET_MROUTE);
774 if (error != 0)
775 return (error);
776 if (inp->inp_ip_p != IPPROTO_RSVP)
777 return (EOPNOTSUPP);
778 error = ip_rsvp_vif ?
779 ip_rsvp_vif(so, sopt) : EINVAL;
780 break;
781
782 case MRT_INIT:
783 case MRT_DONE:
784 case MRT_ADD_VIF:
785 case MRT_DEL_VIF:
786 case MRT_ADD_MFC:
787 case MRT_DEL_MFC:
788 case MRT_VERSION:
789 case MRT_ASSERT:
790 case MRT_API_SUPPORT:
791 case MRT_API_CONFIG:
792 case MRT_ADD_BW_UPCALL:
793 case MRT_DEL_BW_UPCALL:
794 error = priv_check(curthread, PRIV_NETINET_MROUTE);
795 if (error != 0)
796 return (error);
797 if (inp->inp_ip_p != IPPROTO_IGMP)
798 return (EOPNOTSUPP);
799 error = ip_mrouter_set ? ip_mrouter_set(so, sopt) :
800 EOPNOTSUPP;
801 break;
802
803 default:
804 error = ip_ctloutput(so, sopt);
805 break;
806 }
807 break;
808 }
809
810 return (error);
811 }
812
813 void
rip_ctlinput(struct icmp * icmp)814 rip_ctlinput(struct icmp *icmp)
815 {
816 #if defined(IPSEC) || defined(IPSEC_SUPPORT)
817 if (IPSEC_ENABLED(ipv4))
818 IPSEC_CTLINPUT(ipv4, icmp);
819 #endif
820 }
821
822 static int
rip_attach(struct socket * so,int proto,struct thread * td)823 rip_attach(struct socket *so, int proto, struct thread *td)
824 {
825 struct inpcb *inp;
826 int error;
827
828 inp = sotoinpcb(so);
829 KASSERT(inp == NULL, ("rip_attach: inp != NULL"));
830
831 error = priv_check(td, PRIV_NETINET_RAW);
832 if (error)
833 return (error);
834 if (proto >= IPPROTO_MAX || proto < 0)
835 return EPROTONOSUPPORT;
836 error = soreserve(so, rip_sendspace, rip_recvspace);
837 if (error)
838 return (error);
839 error = in_pcballoc(so, &V_ripcbinfo);
840 if (error)
841 return (error);
842 inp = (struct inpcb *)so->so_pcb;
843 inp->inp_ip_p = proto;
844 inp->inp_ip_ttl = V_ip_defttl;
845 INP_HASH_WLOCK(&V_ripcbinfo);
846 rip_inshash(inp);
847 INP_HASH_WUNLOCK(&V_ripcbinfo);
848 INP_WUNLOCK(inp);
849 return (0);
850 }
851
852 static void
rip_detach(struct socket * so)853 rip_detach(struct socket *so)
854 {
855 struct inpcb *inp;
856
857 inp = sotoinpcb(so);
858 KASSERT(inp != NULL, ("rip_detach: inp == NULL"));
859 KASSERT(inp->inp_faddr.s_addr == INADDR_ANY,
860 ("rip_detach: not closed"));
861
862 /* Disable mrouter first */
863 if (so == V_ip_mrouter && ip_mrouter_done)
864 ip_mrouter_done();
865
866 INP_WLOCK(inp);
867 INP_HASH_WLOCK(&V_ripcbinfo);
868 rip_delhash(inp);
869 INP_HASH_WUNLOCK(&V_ripcbinfo);
870
871 if (ip_rsvp_force_done)
872 ip_rsvp_force_done(so);
873 if (so == V_ip_rsvpd)
874 ip_rsvp_done();
875 in_pcbfree(inp);
876 }
877
878 static void
rip_dodisconnect(struct socket * so,struct inpcb * inp)879 rip_dodisconnect(struct socket *so, struct inpcb *inp)
880 {
881 struct inpcbinfo *pcbinfo;
882
883 pcbinfo = inp->inp_pcbinfo;
884 INP_WLOCK(inp);
885 INP_HASH_WLOCK(pcbinfo);
886 rip_delhash(inp);
887 inp->inp_faddr.s_addr = INADDR_ANY;
888 rip_inshash(inp);
889 INP_HASH_WUNLOCK(pcbinfo);
890 SOCK_LOCK(so);
891 so->so_state &= ~SS_ISCONNECTED;
892 SOCK_UNLOCK(so);
893 INP_WUNLOCK(inp);
894 }
895
896 static void
rip_abort(struct socket * so)897 rip_abort(struct socket *so)
898 {
899 struct inpcb *inp;
900
901 inp = sotoinpcb(so);
902 KASSERT(inp != NULL, ("rip_abort: inp == NULL"));
903
904 rip_dodisconnect(so, inp);
905 }
906
907 static void
rip_close(struct socket * so)908 rip_close(struct socket *so)
909 {
910 struct inpcb *inp;
911
912 inp = sotoinpcb(so);
913 KASSERT(inp != NULL, ("rip_close: inp == NULL"));
914
915 rip_dodisconnect(so, inp);
916 }
917
918 static int
rip_disconnect(struct socket * so)919 rip_disconnect(struct socket *so)
920 {
921 struct inpcb *inp;
922
923 if ((so->so_state & SS_ISCONNECTED) == 0)
924 return (ENOTCONN);
925
926 inp = sotoinpcb(so);
927 KASSERT(inp != NULL, ("rip_disconnect: inp == NULL"));
928
929 rip_dodisconnect(so, inp);
930 return (0);
931 }
932
933 static int
rip_bind(struct socket * so,struct sockaddr * nam,struct thread * td)934 rip_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
935 {
936 struct sockaddr_in *addr = (struct sockaddr_in *)nam;
937 struct inpcb *inp;
938 int error;
939
940 if (nam->sa_family != AF_INET)
941 return (EAFNOSUPPORT);
942 if (nam->sa_len != sizeof(*addr))
943 return (EINVAL);
944
945 error = prison_check_ip4(td->td_ucred, &addr->sin_addr);
946 if (error != 0)
947 return (error);
948
949 inp = sotoinpcb(so);
950 KASSERT(inp != NULL, ("rip_bind: inp == NULL"));
951
952 if (CK_STAILQ_EMPTY(&V_ifnet) ||
953 (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) ||
954 (addr->sin_addr.s_addr &&
955 (inp->inp_flags & INP_BINDANY) == 0 &&
956 ifa_ifwithaddr_check((struct sockaddr *)addr) == 0))
957 return (EADDRNOTAVAIL);
958
959 INP_WLOCK(inp);
960 INP_HASH_WLOCK(&V_ripcbinfo);
961 rip_delhash(inp);
962 inp->inp_laddr = addr->sin_addr;
963 rip_inshash(inp);
964 INP_HASH_WUNLOCK(&V_ripcbinfo);
965 INP_WUNLOCK(inp);
966 return (0);
967 }
968
969 static int
rip_connect(struct socket * so,struct sockaddr * nam,struct thread * td)970 rip_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
971 {
972 struct sockaddr_in *addr = (struct sockaddr_in *)nam;
973 struct inpcb *inp;
974
975 if (nam->sa_len != sizeof(*addr))
976 return (EINVAL);
977 if (CK_STAILQ_EMPTY(&V_ifnet))
978 return (EADDRNOTAVAIL);
979 if (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK)
980 return (EAFNOSUPPORT);
981
982 inp = sotoinpcb(so);
983 KASSERT(inp != NULL, ("rip_connect: inp == NULL"));
984
985 INP_WLOCK(inp);
986 INP_HASH_WLOCK(&V_ripcbinfo);
987 rip_delhash(inp);
988 inp->inp_faddr = addr->sin_addr;
989 rip_inshash(inp);
990 INP_HASH_WUNLOCK(&V_ripcbinfo);
991 soisconnected(so);
992 INP_WUNLOCK(inp);
993 return (0);
994 }
995
996 static int
rip_shutdown(struct socket * so,enum shutdown_how how)997 rip_shutdown(struct socket *so, enum shutdown_how how)
998 {
999
1000 SOCK_LOCK(so);
1001 if (!(so->so_state & SS_ISCONNECTED)) {
1002 SOCK_UNLOCK(so);
1003 return (ENOTCONN);
1004 }
1005 SOCK_UNLOCK(so);
1006
1007 switch (how) {
1008 case SHUT_RD:
1009 sorflush(so);
1010 break;
1011 case SHUT_RDWR:
1012 sorflush(so);
1013 /* FALLTHROUGH */
1014 case SHUT_WR:
1015 socantsendmore(so);
1016 }
1017
1018 return (0);
1019 }
1020 #endif /* INET */
1021
1022 static int
rip_pcblist(SYSCTL_HANDLER_ARGS)1023 rip_pcblist(SYSCTL_HANDLER_ARGS)
1024 {
1025 struct inpcb_iterator inpi = INP_ALL_ITERATOR(&V_ripcbinfo,
1026 INPLOOKUP_RLOCKPCB);
1027 struct xinpgen xig;
1028 struct inpcb *inp;
1029 int error;
1030
1031 if (req->newptr != 0)
1032 return (EPERM);
1033
1034 if (req->oldptr == 0) {
1035 int n;
1036
1037 n = V_ripcbinfo.ipi_count;
1038 n += imax(n / 8, 10);
1039 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb);
1040 return (0);
1041 }
1042
1043 if ((error = sysctl_wire_old_buffer(req, 0)) != 0)
1044 return (error);
1045
1046 bzero(&xig, sizeof(xig));
1047 xig.xig_len = sizeof xig;
1048 xig.xig_count = V_ripcbinfo.ipi_count;
1049 xig.xig_gen = V_ripcbinfo.ipi_gencnt;
1050 xig.xig_sogen = so_gencnt;
1051 error = SYSCTL_OUT(req, &xig, sizeof xig);
1052 if (error)
1053 return (error);
1054
1055 while ((inp = inp_next(&inpi)) != NULL) {
1056 if (inp->inp_gencnt <= xig.xig_gen &&
1057 cr_canseeinpcb(req->td->td_ucred, inp) == 0) {
1058 struct xinpcb xi;
1059
1060 in_pcbtoxinpcb(inp, &xi);
1061 error = SYSCTL_OUT(req, &xi, sizeof xi);
1062 if (error) {
1063 INP_RUNLOCK(inp);
1064 break;
1065 }
1066 }
1067 }
1068
1069 if (!error) {
1070 /*
1071 * Give the user an updated idea of our state. If the
1072 * generation differs from what we told her before, she knows
1073 * that something happened while we were processing this
1074 * request, and it might be necessary to retry.
1075 */
1076 xig.xig_gen = V_ripcbinfo.ipi_gencnt;
1077 xig.xig_sogen = so_gencnt;
1078 xig.xig_count = V_ripcbinfo.ipi_count;
1079 error = SYSCTL_OUT(req, &xig, sizeof xig);
1080 }
1081
1082 return (error);
1083 }
1084
1085 SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist,
1086 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
1087 rip_pcblist, "S,xinpcb",
1088 "List of active raw IP sockets");
1089
1090 #ifdef INET
1091 struct protosw rip_protosw = {
1092 .pr_type = SOCK_RAW,
1093 .pr_flags = PR_ATOMIC|PR_ADDR,
1094 .pr_ctloutput = rip_ctloutput,
1095 .pr_abort = rip_abort,
1096 .pr_attach = rip_attach,
1097 .pr_bind = rip_bind,
1098 .pr_connect = rip_connect,
1099 .pr_control = in_control,
1100 .pr_detach = rip_detach,
1101 .pr_disconnect = rip_disconnect,
1102 .pr_peeraddr = in_getpeeraddr,
1103 .pr_send = rip_send,
1104 .pr_shutdown = rip_shutdown,
1105 .pr_sockaddr = in_getsockaddr,
1106 .pr_sosetlabel = in_pcbsosetlabel,
1107 .pr_close = rip_close
1108 };
1109 #endif /* INET */
1110