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