1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1988, 1991, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)rtsock.c 8.7 (Berkeley) 10/12/95
32 * $FreeBSD: stable/12/sys/net/rtsock.c 373225 2023-10-02 09:10:17Z git2svn $
33 */
34 #include "opt_mpath.h"
35 #include "opt_inet.h"
36 #include "opt_inet6.h"
37
38 #include <sys/param.h>
39 #include <sys/jail.h>
40 #include <sys/kernel.h>
41 #include <sys/domain.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/rmlock.h>
49 #include <sys/rwlock.h>
50 #include <sys/signalvar.h>
51 #include <sys/socket.h>
52 #include <sys/socketvar.h>
53 #include <sys/sysctl.h>
54 #include <sys/systm.h>
55
56 #include <net/if.h>
57 #include <net/if_var.h>
58 #include <net/if_dl.h>
59 #include <net/if_llatbl.h>
60 #include <net/if_types.h>
61 #include <net/netisr.h>
62 #include <net/raw_cb.h>
63 #include <net/route.h>
64 #include <net/route_var.h>
65 #include <net/vnet.h>
66
67 #include <netinet/in.h>
68 #include <netinet/if_ether.h>
69 #include <netinet/ip_carp.h>
70 #ifdef INET6
71 #include <netinet6/ip6_var.h>
72 #include <netinet6/scope6_var.h>
73 #endif
74
75 #ifdef COMPAT_FREEBSD32
76 #include <sys/mount.h>
77 #include <compat/freebsd32/freebsd32.h>
78
79 struct if_msghdr32 {
80 uint16_t ifm_msglen;
81 uint8_t ifm_version;
82 uint8_t ifm_type;
83 int32_t ifm_addrs;
84 int32_t ifm_flags;
85 uint16_t ifm_index;
86 uint16_t _ifm_spare1;
87 struct if_data ifm_data;
88 };
89
90 struct if_msghdrl32 {
91 uint16_t ifm_msglen;
92 uint8_t ifm_version;
93 uint8_t ifm_type;
94 int32_t ifm_addrs;
95 int32_t ifm_flags;
96 uint16_t ifm_index;
97 uint16_t _ifm_spare1;
98 uint16_t ifm_len;
99 uint16_t ifm_data_off;
100 uint32_t _ifm_spare2;
101 struct if_data ifm_data;
102 };
103
104 struct ifa_msghdrl32 {
105 uint16_t ifam_msglen;
106 uint8_t ifam_version;
107 uint8_t ifam_type;
108 int32_t ifam_addrs;
109 int32_t ifam_flags;
110 uint16_t ifam_index;
111 uint16_t _ifam_spare1;
112 uint16_t ifam_len;
113 uint16_t ifam_data_off;
114 int32_t ifam_metric;
115 struct if_data ifam_data;
116 };
117
118 #define SA_SIZE32(sa) \
119 ( (((struct sockaddr *)(sa))->sa_len == 0) ? \
120 sizeof(int) : \
121 1 + ( (((struct sockaddr *)(sa))->sa_len - 1) | (sizeof(int) - 1) ) )
122
123 #endif /* COMPAT_FREEBSD32 */
124
125 MALLOC_DEFINE(M_RTABLE, "routetbl", "routing tables");
126
127 /* NB: these are not modified */
128 static struct sockaddr route_src = { 2, PF_ROUTE, };
129 static struct sockaddr sa_zero = { sizeof(sa_zero), AF_INET, };
130
131 /* These are external hooks for CARP. */
132 int (*carp_get_vhid_p)(struct ifaddr *);
133
134 /*
135 * Used by rtsock/raw_input callback code to decide whether to filter the update
136 * notification to a socket bound to a particular FIB.
137 */
138 #define RTS_FILTER_FIB M_PROTO8
139
140 typedef struct {
141 int ip_count; /* attached w/ AF_INET */
142 int ip6_count; /* attached w/ AF_INET6 */
143 int any_count; /* total attached */
144 } route_cb_t;
145 VNET_DEFINE_STATIC(route_cb_t, route_cb);
146 #define V_route_cb VNET(route_cb)
147
148 struct mtx rtsock_mtx;
149 MTX_SYSINIT(rtsock, &rtsock_mtx, "rtsock route_cb lock", MTX_DEF);
150
151 #define RTSOCK_LOCK() mtx_lock(&rtsock_mtx)
152 #define RTSOCK_UNLOCK() mtx_unlock(&rtsock_mtx)
153 #define RTSOCK_LOCK_ASSERT() mtx_assert(&rtsock_mtx, MA_OWNED)
154
155 static SYSCTL_NODE(_net, OID_AUTO, route, CTLFLAG_RD, 0, "");
156
157 struct walkarg {
158 int w_tmemsize;
159 int w_op, w_arg;
160 caddr_t w_tmem;
161 struct sysctl_req *w_req;
162 };
163
164 static void rts_input(struct mbuf *m);
165 static struct mbuf *rtsock_msg_mbuf(int type, struct rt_addrinfo *rtinfo);
166 static int rtsock_msg_buffer(int type, struct rt_addrinfo *rtinfo,
167 struct walkarg *w, int *plen);
168 static int rt_xaddrs(caddr_t cp, caddr_t cplim,
169 struct rt_addrinfo *rtinfo);
170 static int sysctl_dumpentry(struct radix_node *rn, void *vw);
171 static int sysctl_iflist(int af, struct walkarg *w);
172 static int sysctl_ifmalist(int af, struct walkarg *w);
173 static int route_output(struct mbuf *m, struct socket *so, ...);
174 static void rt_getmetrics(const struct rtentry *rt, struct rt_metrics *out);
175 static void rt_dispatch(struct mbuf *, sa_family_t);
176 static struct sockaddr *rtsock_fix_netmask(struct sockaddr *dst,
177 struct sockaddr *smask, struct sockaddr_storage *dmask);
178
179 static struct netisr_handler rtsock_nh = {
180 .nh_name = "rtsock",
181 .nh_handler = rts_input,
182 .nh_proto = NETISR_ROUTE,
183 .nh_policy = NETISR_POLICY_SOURCE,
184 };
185
186 static int
sysctl_route_netisr_maxqlen(SYSCTL_HANDLER_ARGS)187 sysctl_route_netisr_maxqlen(SYSCTL_HANDLER_ARGS)
188 {
189 int error, qlimit;
190
191 netisr_getqlimit(&rtsock_nh, &qlimit);
192 error = sysctl_handle_int(oidp, &qlimit, 0, req);
193 if (error || !req->newptr)
194 return (error);
195 if (qlimit < 1)
196 return (EINVAL);
197 return (netisr_setqlimit(&rtsock_nh, qlimit));
198 }
199 SYSCTL_PROC(_net_route, OID_AUTO, netisr_maxqlen,
200 CTLTYPE_INT | CTLFLAG_RWTUN | CTLFLAG_NOFETCH,
201 0, 0, sysctl_route_netisr_maxqlen, "I",
202 "maximum routing socket dispatch queue length");
203
204 static void
vnet_rts_init(void)205 vnet_rts_init(void)
206 {
207 int tmp;
208
209 if (IS_DEFAULT_VNET(curvnet)) {
210 if (TUNABLE_INT_FETCH("net.route.netisr_maxqlen", &tmp))
211 rtsock_nh.nh_qlimit = tmp;
212 netisr_register(&rtsock_nh);
213 }
214 #ifdef VIMAGE
215 else
216 netisr_register_vnet(&rtsock_nh);
217 #endif
218 }
219 VNET_SYSINIT(vnet_rtsock, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD,
220 vnet_rts_init, 0);
221
222 #ifdef VIMAGE
223 static void
vnet_rts_uninit(void)224 vnet_rts_uninit(void)
225 {
226
227 netisr_unregister_vnet(&rtsock_nh);
228 }
229 VNET_SYSUNINIT(vnet_rts_uninit, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD,
230 vnet_rts_uninit, 0);
231 #endif
232
233 static int
raw_input_rts_cb(struct mbuf * m,struct sockproto * proto,struct sockaddr * src,struct rawcb * rp)234 raw_input_rts_cb(struct mbuf *m, struct sockproto *proto, struct sockaddr *src,
235 struct rawcb *rp)
236 {
237 int fibnum;
238
239 KASSERT(m != NULL, ("%s: m is NULL", __func__));
240 KASSERT(proto != NULL, ("%s: proto is NULL", __func__));
241 KASSERT(rp != NULL, ("%s: rp is NULL", __func__));
242
243 /* No filtering requested. */
244 if ((m->m_flags & RTS_FILTER_FIB) == 0)
245 return (0);
246
247 /* Check if it is a rts and the fib matches the one of the socket. */
248 fibnum = M_GETFIB(m);
249 if (proto->sp_family != PF_ROUTE ||
250 rp->rcb_socket == NULL ||
251 rp->rcb_socket->so_fibnum == fibnum)
252 return (0);
253
254 /* Filtering requested and no match, the socket shall be skipped. */
255 return (1);
256 }
257
258 static void
rts_input(struct mbuf * m)259 rts_input(struct mbuf *m)
260 {
261 struct sockproto route_proto;
262 unsigned short *family;
263 struct m_tag *tag;
264
265 route_proto.sp_family = PF_ROUTE;
266 tag = m_tag_find(m, PACKET_TAG_RTSOCKFAM, NULL);
267 if (tag != NULL) {
268 family = (unsigned short *)(tag + 1);
269 route_proto.sp_protocol = *family;
270 m_tag_delete(m, tag);
271 } else
272 route_proto.sp_protocol = 0;
273
274 raw_input_ext(m, &route_proto, &route_src, raw_input_rts_cb);
275 }
276
277 /*
278 * It really doesn't make any sense at all for this code to share much
279 * with raw_usrreq.c, since its functionality is so restricted. XXX
280 */
281 static void
rts_abort(struct socket * so)282 rts_abort(struct socket *so)
283 {
284
285 raw_usrreqs.pru_abort(so);
286 }
287
288 static void
rts_close(struct socket * so)289 rts_close(struct socket *so)
290 {
291
292 raw_usrreqs.pru_close(so);
293 }
294
295 /* pru_accept is EOPNOTSUPP */
296
297 static int
rts_attach(struct socket * so,int proto,struct thread * td)298 rts_attach(struct socket *so, int proto, struct thread *td)
299 {
300 struct rawcb *rp;
301 int error;
302
303 KASSERT(so->so_pcb == NULL, ("rts_attach: so_pcb != NULL"));
304
305 /* XXX */
306 rp = malloc(sizeof *rp, M_PCB, M_WAITOK | M_ZERO);
307
308 so->so_pcb = (caddr_t)rp;
309 so->so_fibnum = td->td_proc->p_fibnum;
310 error = raw_attach(so, proto);
311 rp = sotorawcb(so);
312 if (error) {
313 so->so_pcb = NULL;
314 free(rp, M_PCB);
315 return error;
316 }
317 RTSOCK_LOCK();
318 switch(rp->rcb_proto.sp_protocol) {
319 case AF_INET:
320 V_route_cb.ip_count++;
321 break;
322 case AF_INET6:
323 V_route_cb.ip6_count++;
324 break;
325 }
326 V_route_cb.any_count++;
327 RTSOCK_UNLOCK();
328 soisconnected(so);
329 so->so_options |= SO_USELOOPBACK;
330 return 0;
331 }
332
333 static int
rts_bind(struct socket * so,struct sockaddr * nam,struct thread * td)334 rts_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
335 {
336
337 return (raw_usrreqs.pru_bind(so, nam, td)); /* xxx just EINVAL */
338 }
339
340 static int
rts_connect(struct socket * so,struct sockaddr * nam,struct thread * td)341 rts_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
342 {
343
344 return (raw_usrreqs.pru_connect(so, nam, td)); /* XXX just EINVAL */
345 }
346
347 /* pru_connect2 is EOPNOTSUPP */
348 /* pru_control is EOPNOTSUPP */
349
350 static void
rts_detach(struct socket * so)351 rts_detach(struct socket *so)
352 {
353 struct rawcb *rp = sotorawcb(so);
354
355 KASSERT(rp != NULL, ("rts_detach: rp == NULL"));
356
357 RTSOCK_LOCK();
358 switch(rp->rcb_proto.sp_protocol) {
359 case AF_INET:
360 V_route_cb.ip_count--;
361 break;
362 case AF_INET6:
363 V_route_cb.ip6_count--;
364 break;
365 }
366 V_route_cb.any_count--;
367 RTSOCK_UNLOCK();
368 raw_usrreqs.pru_detach(so);
369 }
370
371 static int
rts_disconnect(struct socket * so)372 rts_disconnect(struct socket *so)
373 {
374
375 return (raw_usrreqs.pru_disconnect(so));
376 }
377
378 /* pru_listen is EOPNOTSUPP */
379
380 static int
rts_peeraddr(struct socket * so,struct sockaddr ** nam)381 rts_peeraddr(struct socket *so, struct sockaddr **nam)
382 {
383
384 return (raw_usrreqs.pru_peeraddr(so, nam));
385 }
386
387 /* pru_rcvd is EOPNOTSUPP */
388 /* pru_rcvoob is EOPNOTSUPP */
389
390 static int
rts_send(struct socket * so,int flags,struct mbuf * m,struct sockaddr * nam,struct mbuf * control,struct thread * td)391 rts_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
392 struct mbuf *control, struct thread *td)
393 {
394
395 return (raw_usrreqs.pru_send(so, flags, m, nam, control, td));
396 }
397
398 /* pru_sense is null */
399
400 static int
rts_shutdown(struct socket * so)401 rts_shutdown(struct socket *so)
402 {
403
404 return (raw_usrreqs.pru_shutdown(so));
405 }
406
407 static int
rts_sockaddr(struct socket * so,struct sockaddr ** nam)408 rts_sockaddr(struct socket *so, struct sockaddr **nam)
409 {
410
411 return (raw_usrreqs.pru_sockaddr(so, nam));
412 }
413
414 static struct pr_usrreqs route_usrreqs = {
415 .pru_abort = rts_abort,
416 .pru_attach = rts_attach,
417 .pru_bind = rts_bind,
418 .pru_connect = rts_connect,
419 .pru_detach = rts_detach,
420 .pru_disconnect = rts_disconnect,
421 .pru_peeraddr = rts_peeraddr,
422 .pru_send = rts_send,
423 .pru_shutdown = rts_shutdown,
424 .pru_sockaddr = rts_sockaddr,
425 .pru_close = rts_close,
426 };
427
428 #ifndef _SOCKADDR_UNION_DEFINED
429 #define _SOCKADDR_UNION_DEFINED
430 /*
431 * The union of all possible address formats we handle.
432 */
433 union sockaddr_union {
434 struct sockaddr sa;
435 struct sockaddr_in sin;
436 struct sockaddr_in6 sin6;
437 };
438 #endif /* _SOCKADDR_UNION_DEFINED */
439
440 static int
rtm_get_jailed(struct rt_addrinfo * info,struct ifnet * ifp,struct rtentry * rt,union sockaddr_union * saun,struct ucred * cred)441 rtm_get_jailed(struct rt_addrinfo *info, struct ifnet *ifp,
442 struct rtentry *rt, union sockaddr_union *saun, struct ucred *cred)
443 {
444
445 /* First, see if the returned address is part of the jail. */
446 if (prison_if(cred, rt->rt_ifa->ifa_addr) == 0) {
447 info->rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
448 return (0);
449 }
450
451 switch (info->rti_info[RTAX_DST]->sa_family) {
452 #ifdef INET
453 case AF_INET:
454 {
455 struct in_addr ia;
456 struct ifaddr *ifa;
457 int found;
458
459 found = 0;
460 /*
461 * Try to find an address on the given outgoing interface
462 * that belongs to the jail.
463 */
464 IF_ADDR_RLOCK(ifp);
465 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
466 struct sockaddr *sa;
467 sa = ifa->ifa_addr;
468 if (sa->sa_family != AF_INET)
469 continue;
470 ia = ((struct sockaddr_in *)sa)->sin_addr;
471 if (prison_check_ip4(cred, &ia) == 0) {
472 found = 1;
473 break;
474 }
475 }
476 IF_ADDR_RUNLOCK(ifp);
477 if (!found) {
478 /*
479 * As a last resort return the 'default' jail address.
480 */
481 ia = ((struct sockaddr_in *)rt->rt_ifa->ifa_addr)->
482 sin_addr;
483 if (prison_get_ip4(cred, &ia) != 0)
484 return (ESRCH);
485 }
486 bzero(&saun->sin, sizeof(struct sockaddr_in));
487 saun->sin.sin_len = sizeof(struct sockaddr_in);
488 saun->sin.sin_family = AF_INET;
489 saun->sin.sin_addr.s_addr = ia.s_addr;
490 info->rti_info[RTAX_IFA] = (struct sockaddr *)&saun->sin;
491 break;
492 }
493 #endif
494 #ifdef INET6
495 case AF_INET6:
496 {
497 struct in6_addr ia6;
498 struct ifaddr *ifa;
499 int found;
500
501 found = 0;
502 /*
503 * Try to find an address on the given outgoing interface
504 * that belongs to the jail.
505 */
506 IF_ADDR_RLOCK(ifp);
507 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
508 struct sockaddr *sa;
509 sa = ifa->ifa_addr;
510 if (sa->sa_family != AF_INET6)
511 continue;
512 bcopy(&((struct sockaddr_in6 *)sa)->sin6_addr,
513 &ia6, sizeof(struct in6_addr));
514 if (prison_check_ip6(cred, &ia6) == 0) {
515 found = 1;
516 break;
517 }
518 }
519 IF_ADDR_RUNLOCK(ifp);
520 if (!found) {
521 /*
522 * As a last resort return the 'default' jail address.
523 */
524 ia6 = ((struct sockaddr_in6 *)rt->rt_ifa->ifa_addr)->
525 sin6_addr;
526 if (prison_get_ip6(cred, &ia6) != 0)
527 return (ESRCH);
528 }
529 bzero(&saun->sin6, sizeof(struct sockaddr_in6));
530 saun->sin6.sin6_len = sizeof(struct sockaddr_in6);
531 saun->sin6.sin6_family = AF_INET6;
532 bcopy(&ia6, &saun->sin6.sin6_addr, sizeof(struct in6_addr));
533 if (sa6_recoverscope(&saun->sin6) != 0)
534 return (ESRCH);
535 info->rti_info[RTAX_IFA] = (struct sockaddr *)&saun->sin6;
536 break;
537 }
538 #endif
539 default:
540 return (ESRCH);
541 }
542 return (0);
543 }
544
545 /*ARGSUSED*/
546 static int
route_output(struct mbuf * m,struct socket * so,...)547 route_output(struct mbuf *m, struct socket *so, ...)
548 {
549 RIB_RLOCK_TRACKER;
550 struct rt_msghdr *rtm = NULL;
551 struct rtentry *rt = NULL;
552 struct rib_head *rnh;
553 struct rt_addrinfo info;
554 struct sockaddr_storage ss;
555 #ifdef INET6
556 struct sockaddr_in6 *sin6;
557 int i, rti_need_deembed = 0;
558 #endif
559 int alloc_len = 0, len, error = 0, fibnum;
560 struct ifnet *ifp = NULL;
561 union sockaddr_union saun;
562 sa_family_t saf = AF_UNSPEC;
563 struct rawcb *rp = NULL;
564 struct walkarg w;
565
566 fibnum = so->so_fibnum;
567
568 #define senderr(e) { error = e; goto flush;}
569 if (m == NULL || ((m->m_len < sizeof(long)) &&
570 (m = m_pullup(m, sizeof(long))) == NULL))
571 return (ENOBUFS);
572 if ((m->m_flags & M_PKTHDR) == 0)
573 panic("route_output");
574 len = m->m_pkthdr.len;
575 if (len < sizeof(*rtm) ||
576 len != mtod(m, struct rt_msghdr *)->rtm_msglen)
577 senderr(EINVAL);
578
579 /*
580 * Most of current messages are in range 200-240 bytes,
581 * minimize possible re-allocation on reply using larger size
582 * buffer aligned on 1k boundaty.
583 */
584 alloc_len = roundup2(len, 1024);
585 if ((rtm = malloc(alloc_len, M_TEMP, M_NOWAIT)) == NULL)
586 senderr(ENOBUFS);
587
588 m_copydata(m, 0, len, (caddr_t)rtm);
589 bzero(&info, sizeof(info));
590 bzero(&w, sizeof(w));
591
592 if (rtm->rtm_version != RTM_VERSION) {
593 /* Do not touch message since format is unknown */
594 free(rtm, M_TEMP);
595 rtm = NULL;
596 senderr(EPROTONOSUPPORT);
597 }
598
599 /*
600 * Starting from here, it is possible
601 * to alter original message and insert
602 * caller PID and error value.
603 */
604
605 rtm->rtm_pid = curproc->p_pid;
606 info.rti_addrs = rtm->rtm_addrs;
607
608 info.rti_mflags = rtm->rtm_inits;
609 info.rti_rmx = &rtm->rtm_rmx;
610
611 /*
612 * rt_xaddrs() performs s6_addr[2] := sin6_scope_id for AF_INET6
613 * link-local address because rtrequest requires addresses with
614 * embedded scope id.
615 */
616 if (rt_xaddrs((caddr_t)(rtm + 1), len + (caddr_t)rtm, &info))
617 senderr(EINVAL);
618
619 if (rtm->rtm_flags & RTF_RNH_LOCKED)
620 senderr(EINVAL);
621 info.rti_flags = rtm->rtm_flags;
622 if (info.rti_info[RTAX_DST] == NULL ||
623 info.rti_info[RTAX_DST]->sa_family >= AF_MAX ||
624 (info.rti_info[RTAX_GATEWAY] != NULL &&
625 info.rti_info[RTAX_GATEWAY]->sa_family >= AF_MAX))
626 senderr(EINVAL);
627 saf = info.rti_info[RTAX_DST]->sa_family;
628 /*
629 * Verify that the caller has the appropriate privilege; RTM_GET
630 * is the only operation the non-superuser is allowed.
631 */
632 if (rtm->rtm_type != RTM_GET) {
633 error = priv_check(curthread, PRIV_NET_ROUTE);
634 if (error)
635 senderr(error);
636 }
637
638 /*
639 * The given gateway address may be an interface address.
640 * For example, issuing a "route change" command on a route
641 * entry that was created from a tunnel, and the gateway
642 * address given is the local end point. In this case the
643 * RTF_GATEWAY flag must be cleared or the destination will
644 * not be reachable even though there is no error message.
645 */
646 if (info.rti_info[RTAX_GATEWAY] != NULL &&
647 info.rti_info[RTAX_GATEWAY]->sa_family != AF_LINK) {
648 struct rt_addrinfo ginfo;
649 struct sockaddr *gdst;
650
651 bzero(&ginfo, sizeof(ginfo));
652 bzero(&ss, sizeof(ss));
653 ss.ss_len = sizeof(ss);
654
655 ginfo.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&ss;
656 gdst = info.rti_info[RTAX_GATEWAY];
657
658 /*
659 * A host route through the loopback interface is
660 * installed for each interface adddress. In pre 8.0
661 * releases the interface address of a PPP link type
662 * is not reachable locally. This behavior is fixed as
663 * part of the new L2/L3 redesign and rewrite work. The
664 * signature of this interface address route is the
665 * AF_LINK sa_family type of the rt_gateway, and the
666 * rt_ifp has the IFF_LOOPBACK flag set.
667 */
668 if (rib_lookup_info(fibnum, gdst, NHR_REF, 0, &ginfo) == 0) {
669 if (ss.ss_family == AF_LINK &&
670 ginfo.rti_ifp->if_flags & IFF_LOOPBACK) {
671 info.rti_flags &= ~RTF_GATEWAY;
672 info.rti_flags |= RTF_GWFLAG_COMPAT;
673 }
674 rib_free_info(&ginfo);
675 }
676 }
677
678 switch (rtm->rtm_type) {
679 struct rtentry *saved_nrt;
680
681 case RTM_ADD:
682 case RTM_CHANGE:
683 if (rtm->rtm_type == RTM_ADD) {
684 if (info.rti_info[RTAX_GATEWAY] == NULL)
685 senderr(EINVAL);
686 }
687 saved_nrt = NULL;
688
689 /* support for new ARP code */
690 if (info.rti_info[RTAX_GATEWAY] != NULL &&
691 info.rti_info[RTAX_GATEWAY]->sa_family == AF_LINK &&
692 (rtm->rtm_flags & RTF_LLDATA) != 0) {
693 error = lla_rt_output(rtm, &info);
694 #ifdef INET6
695 if (error == 0)
696 rti_need_deembed = (V_deembed_scopeid) ? 1 : 0;
697 #endif
698 break;
699 }
700 error = rtrequest1_fib(rtm->rtm_type, &info, &saved_nrt,
701 fibnum);
702 if (error == 0 && saved_nrt != NULL) {
703 #ifdef INET6
704 rti_need_deembed = (V_deembed_scopeid) ? 1 : 0;
705 #endif
706 RT_LOCK(saved_nrt);
707 rtm->rtm_index = saved_nrt->rt_ifp->if_index;
708 RT_REMREF(saved_nrt);
709 RT_UNLOCK(saved_nrt);
710 }
711 break;
712
713 case RTM_DELETE:
714 saved_nrt = NULL;
715 /* support for new ARP code */
716 if (info.rti_info[RTAX_GATEWAY] &&
717 (info.rti_info[RTAX_GATEWAY]->sa_family == AF_LINK) &&
718 (rtm->rtm_flags & RTF_LLDATA) != 0) {
719 error = lla_rt_output(rtm, &info);
720 #ifdef INET6
721 if (error == 0)
722 rti_need_deembed = (V_deembed_scopeid) ? 1 : 0;
723 #endif
724 break;
725 }
726 error = rtrequest1_fib(RTM_DELETE, &info, &saved_nrt, fibnum);
727 if (error == 0) {
728 RT_LOCK(saved_nrt);
729 rt = saved_nrt;
730 goto report;
731 }
732 #ifdef INET6
733 /* rt_msg2() will not be used when RTM_DELETE fails. */
734 rti_need_deembed = (V_deembed_scopeid) ? 1 : 0;
735 #endif
736 break;
737
738 case RTM_GET:
739 rnh = rt_tables_get_rnh(fibnum, saf);
740 if (rnh == NULL)
741 senderr(EAFNOSUPPORT);
742
743 RIB_RLOCK(rnh);
744
745 if (info.rti_info[RTAX_NETMASK] == NULL &&
746 rtm->rtm_type == RTM_GET) {
747 /*
748 * Provide longest prefix match for
749 * address lookup (no mask).
750 * 'route -n get addr'
751 */
752 rt = (struct rtentry *) rnh->rnh_matchaddr(
753 info.rti_info[RTAX_DST], &rnh->head);
754 } else
755 rt = (struct rtentry *) rnh->rnh_lookup(
756 info.rti_info[RTAX_DST],
757 info.rti_info[RTAX_NETMASK], &rnh->head);
758
759 if (rt == NULL) {
760 RIB_RUNLOCK(rnh);
761 senderr(ESRCH);
762 }
763 #ifdef RADIX_MPATH
764 /*
765 * for RTM_CHANGE/LOCK, if we got multipath routes,
766 * we require users to specify a matching RTAX_GATEWAY.
767 *
768 * for RTM_GET, gate is optional even with multipath.
769 * if gate == NULL the first match is returned.
770 * (no need to call rt_mpath_matchgate if gate == NULL)
771 */
772 if (rt_mpath_capable(rnh) &&
773 (rtm->rtm_type != RTM_GET || info.rti_info[RTAX_GATEWAY])) {
774 rt = rt_mpath_matchgate(rt, info.rti_info[RTAX_GATEWAY]);
775 if (!rt) {
776 RIB_RUNLOCK(rnh);
777 senderr(ESRCH);
778 }
779 }
780 #endif
781 /*
782 * If performing proxied L2 entry insertion, and
783 * the actual PPP host entry is found, perform
784 * another search to retrieve the prefix route of
785 * the local end point of the PPP link.
786 */
787 if (rtm->rtm_flags & RTF_ANNOUNCE) {
788 struct sockaddr laddr;
789
790 if (rt->rt_ifp != NULL &&
791 rt->rt_ifp->if_type == IFT_PROPVIRTUAL) {
792 struct ifaddr *ifa;
793
794 NET_EPOCH_ENTER();
795 ifa = ifa_ifwithnet(info.rti_info[RTAX_DST], 1,
796 RT_ALL_FIBS);
797 if (ifa != NULL)
798 rt_maskedcopy(ifa->ifa_addr,
799 &laddr,
800 ifa->ifa_netmask);
801 NET_EPOCH_EXIT();
802 } else
803 rt_maskedcopy(rt->rt_ifa->ifa_addr,
804 &laddr,
805 rt->rt_ifa->ifa_netmask);
806 /*
807 * refactor rt and no lock operation necessary
808 */
809 rt = (struct rtentry *)rnh->rnh_matchaddr(&laddr,
810 &rnh->head);
811 if (rt == NULL) {
812 RIB_RUNLOCK(rnh);
813 senderr(ESRCH);
814 }
815 }
816 RT_LOCK(rt);
817 RT_ADDREF(rt);
818 RIB_RUNLOCK(rnh);
819
820 report:
821 RT_LOCK_ASSERT(rt);
822 if ((rt->rt_flags & RTF_HOST) == 0
823 ? jailed_without_vnet(curthread->td_ucred)
824 : prison_if(curthread->td_ucred,
825 rt_key(rt)) != 0) {
826 RT_UNLOCK(rt);
827 senderr(ESRCH);
828 }
829 info.rti_info[RTAX_DST] = rt_key(rt);
830 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
831 info.rti_info[RTAX_NETMASK] = rtsock_fix_netmask(rt_key(rt),
832 rt_mask(rt), &ss);
833 info.rti_info[RTAX_GENMASK] = 0;
834 if (rtm->rtm_addrs & (RTA_IFP | RTA_IFA)) {
835 ifp = rt->rt_ifp;
836 if (ifp) {
837 info.rti_info[RTAX_IFP] =
838 ifp->if_addr->ifa_addr;
839 error = rtm_get_jailed(&info, ifp, rt,
840 &saun, curthread->td_ucred);
841 if (error != 0) {
842 RT_UNLOCK(rt);
843 senderr(error);
844 }
845 if (ifp->if_flags & IFF_POINTOPOINT)
846 info.rti_info[RTAX_BRD] =
847 rt->rt_ifa->ifa_dstaddr;
848 rtm->rtm_index = ifp->if_index;
849 } else {
850 info.rti_info[RTAX_IFP] = NULL;
851 info.rti_info[RTAX_IFA] = NULL;
852 }
853 } else if ((ifp = rt->rt_ifp) != NULL) {
854 rtm->rtm_index = ifp->if_index;
855 }
856
857 /* Check if we need to realloc storage */
858 rtsock_msg_buffer(rtm->rtm_type, &info, NULL, &len);
859 if (len > alloc_len) {
860 struct rt_msghdr *new_rtm;
861 new_rtm = malloc(len, M_TEMP, M_NOWAIT);
862 if (new_rtm == NULL) {
863 RT_UNLOCK(rt);
864 senderr(ENOBUFS);
865 }
866 bcopy(rtm, new_rtm, rtm->rtm_msglen);
867 free(rtm, M_TEMP);
868 rtm = new_rtm;
869 alloc_len = len;
870 }
871
872 w.w_tmem = (caddr_t)rtm;
873 w.w_tmemsize = alloc_len;
874 rtsock_msg_buffer(rtm->rtm_type, &info, &w, &len);
875
876 if (rt->rt_flags & RTF_GWFLAG_COMPAT)
877 rtm->rtm_flags = RTF_GATEWAY |
878 (rt->rt_flags & ~RTF_GWFLAG_COMPAT);
879 else
880 rtm->rtm_flags = rt->rt_flags;
881 rt_getmetrics(rt, &rtm->rtm_rmx);
882 rtm->rtm_addrs = info.rti_addrs;
883
884 RT_UNLOCK(rt);
885 break;
886
887 default:
888 senderr(EOPNOTSUPP);
889 }
890
891 flush:
892 if (rt != NULL)
893 RTFREE(rt);
894 /*
895 * Check to see if we don't want our own messages.
896 */
897 if ((so->so_options & SO_USELOOPBACK) == 0) {
898 if (V_route_cb.any_count <= 1) {
899 if (rtm != NULL)
900 free(rtm, M_TEMP);
901 m_freem(m);
902 return (error);
903 }
904 /* There is another listener, so construct message */
905 rp = sotorawcb(so);
906 }
907
908 if (rtm != NULL) {
909 #ifdef INET6
910 if (rti_need_deembed) {
911 /* sin6_scope_id is recovered before sending rtm. */
912 sin6 = (struct sockaddr_in6 *)&ss;
913 for (i = 0; i < RTAX_MAX; i++) {
914 if (info.rti_info[i] == NULL)
915 continue;
916 if (info.rti_info[i]->sa_family != AF_INET6)
917 continue;
918 bcopy(info.rti_info[i], sin6, sizeof(*sin6));
919 if (sa6_recoverscope(sin6) == 0)
920 bcopy(sin6, info.rti_info[i],
921 sizeof(*sin6));
922 }
923 }
924 #endif
925 if (error != 0)
926 rtm->rtm_errno = error;
927 else
928 rtm->rtm_flags |= RTF_DONE;
929
930 m_copyback(m, 0, rtm->rtm_msglen, (caddr_t)rtm);
931 if (m->m_pkthdr.len < rtm->rtm_msglen) {
932 m_freem(m);
933 m = NULL;
934 } else if (m->m_pkthdr.len > rtm->rtm_msglen)
935 m_adj(m, rtm->rtm_msglen - m->m_pkthdr.len);
936
937 free(rtm, M_TEMP);
938 }
939 if (m != NULL) {
940 M_SETFIB(m, fibnum);
941 m->m_flags |= RTS_FILTER_FIB;
942 if (rp) {
943 /*
944 * XXX insure we don't get a copy by
945 * invalidating our protocol
946 */
947 unsigned short family = rp->rcb_proto.sp_family;
948 rp->rcb_proto.sp_family = 0;
949 rt_dispatch(m, saf);
950 rp->rcb_proto.sp_family = family;
951 } else
952 rt_dispatch(m, saf);
953 }
954
955 return (error);
956 }
957
958 static void
rt_getmetrics(const struct rtentry * rt,struct rt_metrics * out)959 rt_getmetrics(const struct rtentry *rt, struct rt_metrics *out)
960 {
961
962 bzero(out, sizeof(*out));
963 out->rmx_mtu = rt->rt_mtu;
964 out->rmx_weight = rt->rt_weight;
965 out->rmx_pksent = counter_u64_fetch(rt->rt_pksent);
966 /* Kernel -> userland timebase conversion. */
967 out->rmx_expire = rt->rt_expire ?
968 rt->rt_expire - time_uptime + time_second : 0;
969 }
970
971 /*
972 * Extract the addresses of the passed sockaddrs.
973 * Do a little sanity checking so as to avoid bad memory references.
974 * This data is derived straight from userland.
975 */
976 static int
rt_xaddrs(caddr_t cp,caddr_t cplim,struct rt_addrinfo * rtinfo)977 rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo)
978 {
979 struct sockaddr *sa;
980 int i;
981
982 for (i = 0; i < RTAX_MAX && cp < cplim; i++) {
983 if ((rtinfo->rti_addrs & (1 << i)) == 0)
984 continue;
985 sa = (struct sockaddr *)cp;
986 /*
987 * It won't fit.
988 */
989 if (cp + sa->sa_len > cplim)
990 return (EINVAL);
991 /*
992 * there are no more.. quit now
993 * If there are more bits, they are in error.
994 * I've seen this. route(1) can evidently generate these.
995 * This causes kernel to core dump.
996 * for compatibility, If we see this, point to a safe address.
997 */
998 if (sa->sa_len == 0) {
999 rtinfo->rti_info[i] = &sa_zero;
1000 return (0); /* should be EINVAL but for compat */
1001 }
1002 /* accept it */
1003 #ifdef INET6
1004 if (sa->sa_family == AF_INET6)
1005 sa6_embedscope((struct sockaddr_in6 *)sa,
1006 V_ip6_use_defzone);
1007 #endif
1008 rtinfo->rti_info[i] = sa;
1009 cp += SA_SIZE(sa);
1010 }
1011 return (0);
1012 }
1013
1014 /*
1015 * Fill in @dmask with valid netmask leaving original @smask
1016 * intact. Mostly used with radix netmasks.
1017 */
1018 static struct sockaddr *
rtsock_fix_netmask(struct sockaddr * dst,struct sockaddr * smask,struct sockaddr_storage * dmask)1019 rtsock_fix_netmask(struct sockaddr *dst, struct sockaddr *smask,
1020 struct sockaddr_storage *dmask)
1021 {
1022 if (dst == NULL || smask == NULL)
1023 return (NULL);
1024
1025 memset(dmask, 0, dst->sa_len);
1026 memcpy(dmask, smask, smask->sa_len);
1027 dmask->ss_len = dst->sa_len;
1028 dmask->ss_family = dst->sa_family;
1029
1030 return ((struct sockaddr *)dmask);
1031 }
1032
1033 /*
1034 * Writes information related to @rtinfo object to newly-allocated mbuf.
1035 * Assumes MCLBYTES is enough to construct any message.
1036 * Used for OS notifications of vaious events (if/ifa announces,etc)
1037 *
1038 * Returns allocated mbuf or NULL on failure.
1039 */
1040 static struct mbuf *
rtsock_msg_mbuf(int type,struct rt_addrinfo * rtinfo)1041 rtsock_msg_mbuf(int type, struct rt_addrinfo *rtinfo)
1042 {
1043 struct rt_msghdr *rtm;
1044 struct mbuf *m;
1045 int i;
1046 struct sockaddr *sa;
1047 #ifdef INET6
1048 struct sockaddr_storage ss;
1049 struct sockaddr_in6 *sin6;
1050 #endif
1051 int len, dlen;
1052
1053 switch (type) {
1054
1055 case RTM_DELADDR:
1056 case RTM_NEWADDR:
1057 len = sizeof(struct ifa_msghdr);
1058 break;
1059
1060 case RTM_DELMADDR:
1061 case RTM_NEWMADDR:
1062 len = sizeof(struct ifma_msghdr);
1063 break;
1064
1065 case RTM_IFINFO:
1066 len = sizeof(struct if_msghdr);
1067 break;
1068
1069 case RTM_IFANNOUNCE:
1070 case RTM_IEEE80211:
1071 len = sizeof(struct if_announcemsghdr);
1072 break;
1073
1074 default:
1075 len = sizeof(struct rt_msghdr);
1076 }
1077
1078 /* XXXGL: can we use MJUMPAGESIZE cluster here? */
1079 KASSERT(len <= MCLBYTES, ("%s: message too big", __func__));
1080 if (len > MHLEN)
1081 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
1082 else
1083 m = m_gethdr(M_NOWAIT, MT_DATA);
1084 if (m == NULL)
1085 return (m);
1086
1087 m->m_pkthdr.len = m->m_len = len;
1088 rtm = mtod(m, struct rt_msghdr *);
1089 bzero((caddr_t)rtm, len);
1090 for (i = 0; i < RTAX_MAX; i++) {
1091 if ((sa = rtinfo->rti_info[i]) == NULL)
1092 continue;
1093 rtinfo->rti_addrs |= (1 << i);
1094 dlen = SA_SIZE(sa);
1095 #ifdef INET6
1096 if (V_deembed_scopeid && sa->sa_family == AF_INET6) {
1097 sin6 = (struct sockaddr_in6 *)&ss;
1098 bcopy(sa, sin6, sizeof(*sin6));
1099 if (sa6_recoverscope(sin6) == 0)
1100 sa = (struct sockaddr *)sin6;
1101 }
1102 #endif
1103 m_copyback(m, len, dlen, (caddr_t)sa);
1104 len += dlen;
1105 }
1106 if (m->m_pkthdr.len != len) {
1107 m_freem(m);
1108 return (NULL);
1109 }
1110 rtm->rtm_msglen = len;
1111 rtm->rtm_version = RTM_VERSION;
1112 rtm->rtm_type = type;
1113 return (m);
1114 }
1115
1116 /*
1117 * Writes information related to @rtinfo object to preallocated buffer.
1118 * Stores needed size in @plen. If @w is NULL, calculates size without
1119 * writing.
1120 * Used for sysctl dumps and rtsock answers (RTM_DEL/RTM_GET) generation.
1121 *
1122 * Returns 0 on success.
1123 *
1124 */
1125 static int
rtsock_msg_buffer(int type,struct rt_addrinfo * rtinfo,struct walkarg * w,int * plen)1126 rtsock_msg_buffer(int type, struct rt_addrinfo *rtinfo, struct walkarg *w, int *plen)
1127 {
1128 int i;
1129 int len, buflen = 0, dlen;
1130 caddr_t cp = NULL;
1131 struct rt_msghdr *rtm = NULL;
1132 #ifdef INET6
1133 struct sockaddr_storage ss;
1134 struct sockaddr_in6 *sin6;
1135 #endif
1136 #ifdef COMPAT_FREEBSD32
1137 bool compat32 = false;
1138 #endif
1139
1140 switch (type) {
1141
1142 case RTM_DELADDR:
1143 case RTM_NEWADDR:
1144 if (w != NULL && w->w_op == NET_RT_IFLISTL) {
1145 #ifdef COMPAT_FREEBSD32
1146 if (w->w_req->flags & SCTL_MASK32) {
1147 len = sizeof(struct ifa_msghdrl32);
1148 compat32 = true;
1149 } else
1150 #endif
1151 len = sizeof(struct ifa_msghdrl);
1152 } else
1153 len = sizeof(struct ifa_msghdr);
1154 break;
1155
1156 case RTM_IFINFO:
1157 #ifdef COMPAT_FREEBSD32
1158 if (w != NULL && w->w_req->flags & SCTL_MASK32) {
1159 if (w->w_op == NET_RT_IFLISTL)
1160 len = sizeof(struct if_msghdrl32);
1161 else
1162 len = sizeof(struct if_msghdr32);
1163 compat32 = true;
1164 break;
1165 }
1166 #endif
1167 if (w != NULL && w->w_op == NET_RT_IFLISTL)
1168 len = sizeof(struct if_msghdrl);
1169 else
1170 len = sizeof(struct if_msghdr);
1171 break;
1172
1173 case RTM_NEWMADDR:
1174 len = sizeof(struct ifma_msghdr);
1175 break;
1176
1177 default:
1178 len = sizeof(struct rt_msghdr);
1179 }
1180
1181 if (w != NULL) {
1182 rtm = (struct rt_msghdr *)w->w_tmem;
1183 buflen = w->w_tmemsize - len;
1184 cp = (caddr_t)w->w_tmem + len;
1185 }
1186
1187 rtinfo->rti_addrs = 0;
1188 for (i = 0; i < RTAX_MAX; i++) {
1189 struct sockaddr *sa;
1190
1191 if ((sa = rtinfo->rti_info[i]) == NULL)
1192 continue;
1193 rtinfo->rti_addrs |= (1 << i);
1194 #ifdef COMPAT_FREEBSD32
1195 if (compat32)
1196 dlen = SA_SIZE32(sa);
1197 else
1198 #endif
1199 dlen = SA_SIZE(sa);
1200 if (cp != NULL && buflen >= dlen) {
1201 #ifdef INET6
1202 if (V_deembed_scopeid && sa->sa_family == AF_INET6) {
1203 sin6 = (struct sockaddr_in6 *)&ss;
1204 bcopy(sa, sin6, sizeof(*sin6));
1205 if (sa6_recoverscope(sin6) == 0)
1206 sa = (struct sockaddr *)sin6;
1207 }
1208 #endif
1209 bcopy((caddr_t)sa, cp, (unsigned)dlen);
1210 cp += dlen;
1211 buflen -= dlen;
1212 } else if (cp != NULL) {
1213 /*
1214 * Buffer too small. Count needed size
1215 * and return with error.
1216 */
1217 cp = NULL;
1218 }
1219
1220 len += dlen;
1221 }
1222
1223 if (cp != NULL) {
1224 dlen = ALIGN(len) - len;
1225 if (buflen < dlen)
1226 cp = NULL;
1227 else {
1228 bzero(cp, dlen);
1229 cp += dlen;
1230 buflen -= dlen;
1231 }
1232 }
1233 len = ALIGN(len);
1234
1235 if (cp != NULL) {
1236 /* fill header iff buffer is large enough */
1237 rtm->rtm_version = RTM_VERSION;
1238 rtm->rtm_type = type;
1239 rtm->rtm_msglen = len;
1240 }
1241
1242 *plen = len;
1243
1244 if (w != NULL && cp == NULL)
1245 return (ENOBUFS);
1246
1247 return (0);
1248 }
1249
1250 /*
1251 * This routine is called to generate a message from the routing
1252 * socket indicating that a redirect has occurred, a routing lookup
1253 * has failed, or that a protocol has detected timeouts to a particular
1254 * destination.
1255 */
1256 void
rt_missmsg_fib(int type,struct rt_addrinfo * rtinfo,int flags,int error,int fibnum)1257 rt_missmsg_fib(int type, struct rt_addrinfo *rtinfo, int flags, int error,
1258 int fibnum)
1259 {
1260 struct rt_msghdr *rtm;
1261 struct mbuf *m;
1262 struct sockaddr *sa = rtinfo->rti_info[RTAX_DST];
1263
1264 if (V_route_cb.any_count == 0)
1265 return;
1266 m = rtsock_msg_mbuf(type, rtinfo);
1267 if (m == NULL)
1268 return;
1269
1270 if (fibnum != RT_ALL_FIBS) {
1271 KASSERT(fibnum >= 0 && fibnum < rt_numfibs, ("%s: fibnum out "
1272 "of range 0 <= %d < %d", __func__, fibnum, rt_numfibs));
1273 M_SETFIB(m, fibnum);
1274 m->m_flags |= RTS_FILTER_FIB;
1275 }
1276
1277 rtm = mtod(m, struct rt_msghdr *);
1278 rtm->rtm_flags = RTF_DONE | flags;
1279 rtm->rtm_errno = error;
1280 rtm->rtm_addrs = rtinfo->rti_addrs;
1281 rt_dispatch(m, sa ? sa->sa_family : AF_UNSPEC);
1282 }
1283
1284 void
rt_missmsg(int type,struct rt_addrinfo * rtinfo,int flags,int error)1285 rt_missmsg(int type, struct rt_addrinfo *rtinfo, int flags, int error)
1286 {
1287
1288 rt_missmsg_fib(type, rtinfo, flags, error, RT_ALL_FIBS);
1289 }
1290
1291 /*
1292 * This routine is called to generate a message from the routing
1293 * socket indicating that the status of a network interface has changed.
1294 */
1295 void
rt_ifmsg(struct ifnet * ifp)1296 rt_ifmsg(struct ifnet *ifp)
1297 {
1298 struct if_msghdr *ifm;
1299 struct mbuf *m;
1300 struct rt_addrinfo info;
1301
1302 if (V_route_cb.any_count == 0)
1303 return;
1304 bzero((caddr_t)&info, sizeof(info));
1305 m = rtsock_msg_mbuf(RTM_IFINFO, &info);
1306 if (m == NULL)
1307 return;
1308 ifm = mtod(m, struct if_msghdr *);
1309 ifm->ifm_index = ifp->if_index;
1310 ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
1311 if_data_copy(ifp, &ifm->ifm_data);
1312 ifm->ifm_addrs = 0;
1313 rt_dispatch(m, AF_UNSPEC);
1314 }
1315
1316 /*
1317 * Announce interface address arrival/withdraw.
1318 * Please do not call directly, use rt_addrmsg().
1319 * Assume input data to be valid.
1320 * Returns 0 on success.
1321 */
1322 int
rtsock_addrmsg(int cmd,struct ifaddr * ifa,int fibnum)1323 rtsock_addrmsg(int cmd, struct ifaddr *ifa, int fibnum)
1324 {
1325 struct rt_addrinfo info;
1326 struct sockaddr *sa;
1327 int ncmd;
1328 struct mbuf *m;
1329 struct ifa_msghdr *ifam;
1330 struct ifnet *ifp = ifa->ifa_ifp;
1331 struct sockaddr_storage ss;
1332
1333 if (V_route_cb.any_count == 0)
1334 return (0);
1335
1336 ncmd = cmd == RTM_ADD ? RTM_NEWADDR : RTM_DELADDR;
1337
1338 bzero((caddr_t)&info, sizeof(info));
1339 info.rti_info[RTAX_IFA] = sa = ifa->ifa_addr;
1340 info.rti_info[RTAX_IFP] = ifp->if_addr->ifa_addr;
1341 info.rti_info[RTAX_NETMASK] = rtsock_fix_netmask(
1342 info.rti_info[RTAX_IFP], ifa->ifa_netmask, &ss);
1343 info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr;
1344 if ((m = rtsock_msg_mbuf(ncmd, &info)) == NULL)
1345 return (ENOBUFS);
1346 ifam = mtod(m, struct ifa_msghdr *);
1347 ifam->ifam_index = ifp->if_index;
1348 ifam->ifam_metric = ifa->ifa_ifp->if_metric;
1349 ifam->ifam_flags = ifa->ifa_flags;
1350 ifam->ifam_addrs = info.rti_addrs;
1351
1352 if (fibnum != RT_ALL_FIBS) {
1353 M_SETFIB(m, fibnum);
1354 m->m_flags |= RTS_FILTER_FIB;
1355 }
1356
1357 rt_dispatch(m, sa ? sa->sa_family : AF_UNSPEC);
1358
1359 return (0);
1360 }
1361
1362 /*
1363 * Announce route addition/removal.
1364 * Please do not call directly, use rt_routemsg().
1365 * Note that @rt data MAY be inconsistent/invalid:
1366 * if some userland app sends us "invalid" route message (invalid mask,
1367 * no dst, wrong address families, etc...) we need to pass it back
1368 * to app (and any other rtsock consumers) with rtm_errno field set to
1369 * non-zero value.
1370 *
1371 * Returns 0 on success.
1372 */
1373 int
rtsock_routemsg(int cmd,struct ifnet * ifp,int error,struct rtentry * rt,int fibnum)1374 rtsock_routemsg(int cmd, struct ifnet *ifp, int error, struct rtentry *rt,
1375 int fibnum)
1376 {
1377 struct rt_addrinfo info;
1378 struct sockaddr *sa;
1379 struct mbuf *m;
1380 struct rt_msghdr *rtm;
1381 struct sockaddr_storage ss;
1382
1383 if (V_route_cb.any_count == 0)
1384 return (0);
1385
1386 bzero((caddr_t)&info, sizeof(info));
1387 info.rti_info[RTAX_DST] = sa = rt_key(rt);
1388 info.rti_info[RTAX_NETMASK] = rtsock_fix_netmask(sa, rt_mask(rt), &ss);
1389 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
1390 if ((m = rtsock_msg_mbuf(cmd, &info)) == NULL)
1391 return (ENOBUFS);
1392 rtm = mtod(m, struct rt_msghdr *);
1393 rtm->rtm_index = ifp->if_index;
1394 rtm->rtm_flags |= rt->rt_flags;
1395 rtm->rtm_errno = error;
1396 rtm->rtm_addrs = info.rti_addrs;
1397
1398 if (fibnum != RT_ALL_FIBS) {
1399 M_SETFIB(m, fibnum);
1400 m->m_flags |= RTS_FILTER_FIB;
1401 }
1402
1403 rt_dispatch(m, sa ? sa->sa_family : AF_UNSPEC);
1404
1405 return (0);
1406 }
1407
1408 /*
1409 * This is the analogue to the rt_newaddrmsg which performs the same
1410 * function but for multicast group memberhips. This is easier since
1411 * there is no route state to worry about.
1412 */
1413 void
rt_newmaddrmsg(int cmd,struct ifmultiaddr * ifma)1414 rt_newmaddrmsg(int cmd, struct ifmultiaddr *ifma)
1415 {
1416 struct rt_addrinfo info;
1417 struct mbuf *m = NULL;
1418 struct ifnet *ifp = ifma->ifma_ifp;
1419 struct ifma_msghdr *ifmam;
1420
1421 if (V_route_cb.any_count == 0)
1422 return;
1423
1424 bzero((caddr_t)&info, sizeof(info));
1425 info.rti_info[RTAX_IFA] = ifma->ifma_addr;
1426 if (ifp && ifp->if_addr)
1427 info.rti_info[RTAX_IFP] = ifp->if_addr->ifa_addr;
1428 else
1429 info.rti_info[RTAX_IFP] = NULL;
1430 /*
1431 * If a link-layer address is present, present it as a ``gateway''
1432 * (similarly to how ARP entries, e.g., are presented).
1433 */
1434 info.rti_info[RTAX_GATEWAY] = ifma->ifma_lladdr;
1435 m = rtsock_msg_mbuf(cmd, &info);
1436 if (m == NULL)
1437 return;
1438 ifmam = mtod(m, struct ifma_msghdr *);
1439 KASSERT(ifp != NULL, ("%s: link-layer multicast address w/o ifp\n",
1440 __func__));
1441 ifmam->ifmam_index = ifp->if_index;
1442 ifmam->ifmam_addrs = info.rti_addrs;
1443 rt_dispatch(m, ifma->ifma_addr ? ifma->ifma_addr->sa_family : AF_UNSPEC);
1444 }
1445
1446 static struct mbuf *
rt_makeifannouncemsg(struct ifnet * ifp,int type,int what,struct rt_addrinfo * info)1447 rt_makeifannouncemsg(struct ifnet *ifp, int type, int what,
1448 struct rt_addrinfo *info)
1449 {
1450 struct if_announcemsghdr *ifan;
1451 struct mbuf *m;
1452
1453 if (V_route_cb.any_count == 0)
1454 return NULL;
1455 bzero((caddr_t)info, sizeof(*info));
1456 m = rtsock_msg_mbuf(type, info);
1457 if (m != NULL) {
1458 ifan = mtod(m, struct if_announcemsghdr *);
1459 ifan->ifan_index = ifp->if_index;
1460 strlcpy(ifan->ifan_name, ifp->if_xname,
1461 sizeof(ifan->ifan_name));
1462 ifan->ifan_what = what;
1463 }
1464 return m;
1465 }
1466
1467 /*
1468 * This is called to generate routing socket messages indicating
1469 * IEEE80211 wireless events.
1470 * XXX we piggyback on the RTM_IFANNOUNCE msg format in a clumsy way.
1471 */
1472 void
rt_ieee80211msg(struct ifnet * ifp,int what,void * data,size_t data_len)1473 rt_ieee80211msg(struct ifnet *ifp, int what, void *data, size_t data_len)
1474 {
1475 struct mbuf *m;
1476 struct rt_addrinfo info;
1477
1478 m = rt_makeifannouncemsg(ifp, RTM_IEEE80211, what, &info);
1479 if (m != NULL) {
1480 /*
1481 * Append the ieee80211 data. Try to stick it in the
1482 * mbuf containing the ifannounce msg; otherwise allocate
1483 * a new mbuf and append.
1484 *
1485 * NB: we assume m is a single mbuf.
1486 */
1487 if (data_len > M_TRAILINGSPACE(m)) {
1488 struct mbuf *n = m_get(M_NOWAIT, MT_DATA);
1489 if (n == NULL) {
1490 m_freem(m);
1491 return;
1492 }
1493 bcopy(data, mtod(n, void *), data_len);
1494 n->m_len = data_len;
1495 m->m_next = n;
1496 } else if (data_len > 0) {
1497 bcopy(data, mtod(m, u_int8_t *) + m->m_len, data_len);
1498 m->m_len += data_len;
1499 }
1500 if (m->m_flags & M_PKTHDR)
1501 m->m_pkthdr.len += data_len;
1502 mtod(m, struct if_announcemsghdr *)->ifan_msglen += data_len;
1503 rt_dispatch(m, AF_UNSPEC);
1504 }
1505 }
1506
1507 /*
1508 * This is called to generate routing socket messages indicating
1509 * network interface arrival and departure.
1510 */
1511 void
rt_ifannouncemsg(struct ifnet * ifp,int what)1512 rt_ifannouncemsg(struct ifnet *ifp, int what)
1513 {
1514 struct mbuf *m;
1515 struct rt_addrinfo info;
1516
1517 m = rt_makeifannouncemsg(ifp, RTM_IFANNOUNCE, what, &info);
1518 if (m != NULL)
1519 rt_dispatch(m, AF_UNSPEC);
1520 }
1521
1522 static void
rt_dispatch(struct mbuf * m,sa_family_t saf)1523 rt_dispatch(struct mbuf *m, sa_family_t saf)
1524 {
1525 struct m_tag *tag;
1526
1527 /*
1528 * Preserve the family from the sockaddr, if any, in an m_tag for
1529 * use when injecting the mbuf into the routing socket buffer from
1530 * the netisr.
1531 */
1532 if (saf != AF_UNSPEC) {
1533 tag = m_tag_get(PACKET_TAG_RTSOCKFAM, sizeof(unsigned short),
1534 M_NOWAIT);
1535 if (tag == NULL) {
1536 m_freem(m);
1537 return;
1538 }
1539 *(unsigned short *)(tag + 1) = saf;
1540 m_tag_prepend(m, tag);
1541 }
1542 #ifdef VIMAGE
1543 if (V_loif)
1544 m->m_pkthdr.rcvif = V_loif;
1545 else {
1546 m_freem(m);
1547 return;
1548 }
1549 #endif
1550 netisr_queue(NETISR_ROUTE, m); /* mbuf is free'd on failure. */
1551 }
1552
1553 /*
1554 * This is used in dumping the kernel table via sysctl().
1555 */
1556 static int
sysctl_dumpentry(struct radix_node * rn,void * vw)1557 sysctl_dumpentry(struct radix_node *rn, void *vw)
1558 {
1559 struct walkarg *w = vw;
1560 struct rtentry *rt = (struct rtentry *)rn;
1561 int error = 0, size;
1562 struct rt_addrinfo info;
1563 struct sockaddr_storage ss;
1564
1565 IFNET_RLOCK_NOSLEEP_ASSERT();
1566
1567 if (w->w_op == NET_RT_FLAGS && !(rt->rt_flags & w->w_arg))
1568 return 0;
1569 if ((rt->rt_flags & RTF_HOST) == 0
1570 ? jailed_without_vnet(w->w_req->td->td_ucred)
1571 : prison_if(w->w_req->td->td_ucred, rt_key(rt)) != 0)
1572 return (0);
1573 bzero((caddr_t)&info, sizeof(info));
1574 info.rti_info[RTAX_DST] = rt_key(rt);
1575 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
1576 info.rti_info[RTAX_NETMASK] = rtsock_fix_netmask(rt_key(rt),
1577 rt_mask(rt), &ss);
1578 info.rti_info[RTAX_GENMASK] = 0;
1579 if (rt->rt_ifp && !(rt->rt_ifp->if_flags & IFF_DYING)) {
1580 info.rti_info[RTAX_IFP] = rt->rt_ifp->if_addr->ifa_addr;
1581 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
1582 if (rt->rt_ifp->if_flags & IFF_POINTOPOINT)
1583 info.rti_info[RTAX_BRD] = rt->rt_ifa->ifa_dstaddr;
1584 }
1585 if ((error = rtsock_msg_buffer(RTM_GET, &info, w, &size)) != 0)
1586 return (error);
1587 if (w->w_req && w->w_tmem) {
1588 struct rt_msghdr *rtm = (struct rt_msghdr *)w->w_tmem;
1589
1590 bzero(&rtm->rtm_index,
1591 sizeof(*rtm) - offsetof(struct rt_msghdr, rtm_index));
1592 if (rt->rt_flags & RTF_GWFLAG_COMPAT)
1593 rtm->rtm_flags = RTF_GATEWAY |
1594 (rt->rt_flags & ~RTF_GWFLAG_COMPAT);
1595 else
1596 rtm->rtm_flags = rt->rt_flags;
1597 rt_getmetrics(rt, &rtm->rtm_rmx);
1598 rtm->rtm_index = rt->rt_ifp->if_index;
1599 rtm->rtm_addrs = info.rti_addrs;
1600 error = SYSCTL_OUT(w->w_req, (caddr_t)rtm, size);
1601 return (error);
1602 }
1603 return (error);
1604 }
1605
1606 static int
sysctl_iflist_ifml(struct ifnet * ifp,const struct if_data * src_ifd,struct rt_addrinfo * info,struct walkarg * w,int len)1607 sysctl_iflist_ifml(struct ifnet *ifp, const struct if_data *src_ifd,
1608 struct rt_addrinfo *info, struct walkarg *w, int len)
1609 {
1610 struct if_msghdrl *ifm;
1611 struct if_data *ifd;
1612
1613 ifm = (struct if_msghdrl *)w->w_tmem;
1614
1615 #ifdef COMPAT_FREEBSD32
1616 if (w->w_req->flags & SCTL_MASK32) {
1617 struct if_msghdrl32 *ifm32;
1618
1619 ifm32 = (struct if_msghdrl32 *)ifm;
1620 ifm32->ifm_addrs = info->rti_addrs;
1621 ifm32->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
1622 ifm32->ifm_index = ifp->if_index;
1623 ifm32->_ifm_spare1 = 0;
1624 ifm32->ifm_len = sizeof(*ifm32);
1625 ifm32->ifm_data_off = offsetof(struct if_msghdrl32, ifm_data);
1626 ifm32->_ifm_spare2 = 0;
1627 ifd = &ifm32->ifm_data;
1628 } else
1629 #endif
1630 {
1631 ifm->ifm_addrs = info->rti_addrs;
1632 ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
1633 ifm->ifm_index = ifp->if_index;
1634 ifm->_ifm_spare1 = 0;
1635 ifm->ifm_len = sizeof(*ifm);
1636 ifm->ifm_data_off = offsetof(struct if_msghdrl, ifm_data);
1637 ifm->_ifm_spare2 = 0;
1638 ifd = &ifm->ifm_data;
1639 }
1640
1641 memcpy(ifd, src_ifd, sizeof(*ifd));
1642
1643 return (SYSCTL_OUT(w->w_req, (caddr_t)ifm, len));
1644 }
1645
1646 static int
sysctl_iflist_ifm(struct ifnet * ifp,const struct if_data * src_ifd,struct rt_addrinfo * info,struct walkarg * w,int len)1647 sysctl_iflist_ifm(struct ifnet *ifp, const struct if_data *src_ifd,
1648 struct rt_addrinfo *info, struct walkarg *w, int len)
1649 {
1650 struct if_msghdr *ifm;
1651 struct if_data *ifd;
1652
1653 ifm = (struct if_msghdr *)w->w_tmem;
1654
1655 #ifdef COMPAT_FREEBSD32
1656 if (w->w_req->flags & SCTL_MASK32) {
1657 struct if_msghdr32 *ifm32;
1658
1659 ifm32 = (struct if_msghdr32 *)ifm;
1660 ifm32->ifm_addrs = info->rti_addrs;
1661 ifm32->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
1662 ifm32->ifm_index = ifp->if_index;
1663 ifm32->_ifm_spare1 = 0;
1664 ifd = &ifm32->ifm_data;
1665 } else
1666 #endif
1667 {
1668 ifm->ifm_addrs = info->rti_addrs;
1669 ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
1670 ifm->ifm_index = ifp->if_index;
1671 ifm->_ifm_spare1 = 0;
1672 ifd = &ifm->ifm_data;
1673 }
1674
1675 memcpy(ifd, src_ifd, sizeof(*ifd));
1676
1677 return (SYSCTL_OUT(w->w_req, (caddr_t)ifm, len));
1678 }
1679
1680 static int
sysctl_iflist_ifaml(struct ifaddr * ifa,struct rt_addrinfo * info,struct walkarg * w,int len)1681 sysctl_iflist_ifaml(struct ifaddr *ifa, struct rt_addrinfo *info,
1682 struct walkarg *w, int len)
1683 {
1684 struct ifa_msghdrl *ifam;
1685 struct if_data *ifd;
1686
1687 ifam = (struct ifa_msghdrl *)w->w_tmem;
1688
1689 #ifdef COMPAT_FREEBSD32
1690 if (w->w_req->flags & SCTL_MASK32) {
1691 struct ifa_msghdrl32 *ifam32;
1692
1693 ifam32 = (struct ifa_msghdrl32 *)ifam;
1694 ifam32->ifam_addrs = info->rti_addrs;
1695 ifam32->ifam_flags = ifa->ifa_flags;
1696 ifam32->ifam_index = ifa->ifa_ifp->if_index;
1697 ifam32->_ifam_spare1 = 0;
1698 ifam32->ifam_len = sizeof(*ifam32);
1699 ifam32->ifam_data_off =
1700 offsetof(struct ifa_msghdrl32, ifam_data);
1701 ifam32->ifam_metric = ifa->ifa_ifp->if_metric;
1702 ifd = &ifam32->ifam_data;
1703 } else
1704 #endif
1705 {
1706 ifam->ifam_addrs = info->rti_addrs;
1707 ifam->ifam_flags = ifa->ifa_flags;
1708 ifam->ifam_index = ifa->ifa_ifp->if_index;
1709 ifam->_ifam_spare1 = 0;
1710 ifam->ifam_len = sizeof(*ifam);
1711 ifam->ifam_data_off = offsetof(struct ifa_msghdrl, ifam_data);
1712 ifam->ifam_metric = ifa->ifa_ifp->if_metric;
1713 ifd = &ifam->ifam_data;
1714 }
1715
1716 bzero(ifd, sizeof(*ifd));
1717 ifd->ifi_datalen = sizeof(struct if_data);
1718 ifd->ifi_ipackets = counter_u64_fetch(ifa->ifa_ipackets);
1719 ifd->ifi_opackets = counter_u64_fetch(ifa->ifa_opackets);
1720 ifd->ifi_ibytes = counter_u64_fetch(ifa->ifa_ibytes);
1721 ifd->ifi_obytes = counter_u64_fetch(ifa->ifa_obytes);
1722
1723 /* Fixup if_data carp(4) vhid. */
1724 if (carp_get_vhid_p != NULL)
1725 ifd->ifi_vhid = (*carp_get_vhid_p)(ifa);
1726
1727 return (SYSCTL_OUT(w->w_req, w->w_tmem, len));
1728 }
1729
1730 static int
sysctl_iflist_ifam(struct ifaddr * ifa,struct rt_addrinfo * info,struct walkarg * w,int len)1731 sysctl_iflist_ifam(struct ifaddr *ifa, struct rt_addrinfo *info,
1732 struct walkarg *w, int len)
1733 {
1734 struct ifa_msghdr *ifam;
1735
1736 ifam = (struct ifa_msghdr *)w->w_tmem;
1737 ifam->ifam_addrs = info->rti_addrs;
1738 ifam->ifam_flags = ifa->ifa_flags;
1739 ifam->ifam_index = ifa->ifa_ifp->if_index;
1740 ifam->_ifam_spare1 = 0;
1741 ifam->ifam_metric = ifa->ifa_ifp->if_metric;
1742
1743 return (SYSCTL_OUT(w->w_req, w->w_tmem, len));
1744 }
1745
1746 static int
sysctl_iflist(int af,struct walkarg * w)1747 sysctl_iflist(int af, struct walkarg *w)
1748 {
1749 struct ifnet *ifp;
1750 struct ifaddr *ifa;
1751 struct if_data ifd;
1752 struct rt_addrinfo info;
1753 int len, error = 0;
1754 struct sockaddr_storage ss;
1755 struct epoch_tracker et;
1756
1757 bzero((caddr_t)&info, sizeof(info));
1758 bzero(&ifd, sizeof(ifd));
1759 NET_EPOCH_ENTER_ET(et);
1760 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1761 if (w->w_arg && w->w_arg != ifp->if_index)
1762 continue;
1763 if_data_copy(ifp, &ifd);
1764 ifa = ifp->if_addr;
1765 info.rti_info[RTAX_IFP] = ifa->ifa_addr;
1766 error = rtsock_msg_buffer(RTM_IFINFO, &info, w, &len);
1767 if (error != 0)
1768 goto done;
1769 info.rti_info[RTAX_IFP] = NULL;
1770 if (w->w_req && w->w_tmem) {
1771 if (w->w_op == NET_RT_IFLISTL)
1772 error = sysctl_iflist_ifml(ifp, &ifd, &info, w,
1773 len);
1774 else
1775 error = sysctl_iflist_ifm(ifp, &ifd, &info, w,
1776 len);
1777 if (error)
1778 goto done;
1779 }
1780 while ((ifa = CK_STAILQ_NEXT(ifa, ifa_link)) != NULL) {
1781 if (af && af != ifa->ifa_addr->sa_family)
1782 continue;
1783 if (prison_if(w->w_req->td->td_ucred,
1784 ifa->ifa_addr) != 0)
1785 continue;
1786 info.rti_info[RTAX_IFA] = ifa->ifa_addr;
1787 info.rti_info[RTAX_NETMASK] = rtsock_fix_netmask(
1788 ifa->ifa_addr, ifa->ifa_netmask, &ss);
1789 info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr;
1790 error = rtsock_msg_buffer(RTM_NEWADDR, &info, w, &len);
1791 if (error != 0)
1792 goto done;
1793 if (w->w_req && w->w_tmem) {
1794 if (w->w_op == NET_RT_IFLISTL)
1795 error = sysctl_iflist_ifaml(ifa, &info,
1796 w, len);
1797 else
1798 error = sysctl_iflist_ifam(ifa, &info,
1799 w, len);
1800 if (error)
1801 goto done;
1802 }
1803 }
1804 info.rti_info[RTAX_IFA] = NULL;
1805 info.rti_info[RTAX_NETMASK] = NULL;
1806 info.rti_info[RTAX_BRD] = NULL;
1807 }
1808 done:
1809 NET_EPOCH_EXIT_ET(et);
1810 return (error);
1811 }
1812
1813 static int
sysctl_ifmalist(int af,struct walkarg * w)1814 sysctl_ifmalist(int af, struct walkarg *w)
1815 {
1816 struct rt_addrinfo info;
1817 struct ifaddr *ifa;
1818 struct ifmultiaddr *ifma;
1819 struct ifnet *ifp;
1820 int error, len;
1821
1822 error = 0;
1823 bzero((caddr_t)&info, sizeof(info));
1824
1825 IFNET_RLOCK_NOSLEEP();
1826 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1827 if (w->w_arg && w->w_arg != ifp->if_index)
1828 continue;
1829 ifa = ifp->if_addr;
1830 info.rti_info[RTAX_IFP] = ifa ? ifa->ifa_addr : NULL;
1831 IF_ADDR_RLOCK(ifp);
1832 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1833 if (af && af != ifma->ifma_addr->sa_family)
1834 continue;
1835 if (prison_if(w->w_req->td->td_ucred,
1836 ifma->ifma_addr) != 0)
1837 continue;
1838 info.rti_info[RTAX_IFA] = ifma->ifma_addr;
1839 info.rti_info[RTAX_GATEWAY] =
1840 (ifma->ifma_addr->sa_family != AF_LINK) ?
1841 ifma->ifma_lladdr : NULL;
1842 error = rtsock_msg_buffer(RTM_NEWMADDR, &info, w, &len);
1843 if (error != 0)
1844 break;
1845 if (w->w_req && w->w_tmem) {
1846 struct ifma_msghdr *ifmam;
1847
1848 ifmam = (struct ifma_msghdr *)w->w_tmem;
1849 ifmam->ifmam_index = ifma->ifma_ifp->if_index;
1850 ifmam->ifmam_flags = 0;
1851 ifmam->ifmam_addrs = info.rti_addrs;
1852 ifmam->_ifmam_spare1 = 0;
1853 error = SYSCTL_OUT(w->w_req, w->w_tmem, len);
1854 if (error != 0)
1855 break;
1856 }
1857 }
1858 IF_ADDR_RUNLOCK(ifp);
1859 if (error != 0)
1860 break;
1861 }
1862 IFNET_RUNLOCK_NOSLEEP();
1863 return (error);
1864 }
1865
1866 static int
sysctl_rtsock(SYSCTL_HANDLER_ARGS)1867 sysctl_rtsock(SYSCTL_HANDLER_ARGS)
1868 {
1869 RIB_RLOCK_TRACKER;
1870 int *name = (int *)arg1;
1871 u_int namelen = arg2;
1872 struct rib_head *rnh = NULL; /* silence compiler. */
1873 int i, lim, error = EINVAL;
1874 int fib = 0;
1875 u_char af;
1876 struct walkarg w;
1877
1878 name ++;
1879 namelen--;
1880 if (req->newptr)
1881 return (EPERM);
1882 if (name[1] == NET_RT_DUMP) {
1883 if (namelen == 3)
1884 fib = req->td->td_proc->p_fibnum;
1885 else if (namelen == 4)
1886 fib = (name[3] == RT_ALL_FIBS) ?
1887 req->td->td_proc->p_fibnum : name[3];
1888 else
1889 return ((namelen < 3) ? EISDIR : ENOTDIR);
1890 if (fib < 0 || fib >= rt_numfibs)
1891 return (EINVAL);
1892 } else if (namelen != 3)
1893 return ((namelen < 3) ? EISDIR : ENOTDIR);
1894 af = name[0];
1895 if (af > AF_MAX)
1896 return (EINVAL);
1897 bzero(&w, sizeof(w));
1898 w.w_op = name[1];
1899 w.w_arg = name[2];
1900 w.w_req = req;
1901
1902 error = sysctl_wire_old_buffer(req, 0);
1903 if (error)
1904 return (error);
1905
1906 /*
1907 * Allocate reply buffer in advance.
1908 * All rtsock messages has maximum length of u_short.
1909 */
1910 w.w_tmemsize = 65536;
1911 w.w_tmem = malloc(w.w_tmemsize, M_TEMP, M_WAITOK);
1912
1913 switch (w.w_op) {
1914
1915 case NET_RT_DUMP:
1916 case NET_RT_FLAGS:
1917 if (af == 0) { /* dump all tables */
1918 i = 1;
1919 lim = AF_MAX;
1920 } else /* dump only one table */
1921 i = lim = af;
1922
1923 /*
1924 * take care of llinfo entries, the caller must
1925 * specify an AF
1926 */
1927 if (w.w_op == NET_RT_FLAGS &&
1928 (w.w_arg == 0 || w.w_arg & RTF_LLINFO)) {
1929 if (af != 0)
1930 error = lltable_sysctl_dumparp(af, w.w_req);
1931 else
1932 error = EINVAL;
1933 break;
1934 }
1935 /*
1936 * take care of routing entries
1937 */
1938 for (error = 0; error == 0 && i <= lim; i++) {
1939 rnh = rt_tables_get_rnh(fib, i);
1940 if (rnh != NULL) {
1941 RIB_RLOCK(rnh);
1942 IFNET_RLOCK_NOSLEEP();
1943 error = rnh->rnh_walktree(&rnh->head,
1944 sysctl_dumpentry, &w);
1945 IFNET_RUNLOCK_NOSLEEP();
1946 RIB_RUNLOCK(rnh);
1947 } else if (af != 0)
1948 error = EAFNOSUPPORT;
1949 }
1950 break;
1951
1952 case NET_RT_IFLIST:
1953 case NET_RT_IFLISTL:
1954 error = sysctl_iflist(af, &w);
1955 break;
1956
1957 case NET_RT_IFMALIST:
1958 error = sysctl_ifmalist(af, &w);
1959 break;
1960 }
1961
1962 free(w.w_tmem, M_TEMP);
1963 return (error);
1964 }
1965
1966 static SYSCTL_NODE(_net, PF_ROUTE, routetable, CTLFLAG_RD, sysctl_rtsock, "");
1967
1968 /*
1969 * Definitions of protocols supported in the ROUTE domain.
1970 */
1971
1972 static struct domain routedomain; /* or at least forward */
1973
1974 static struct protosw routesw[] = {
1975 {
1976 .pr_type = SOCK_RAW,
1977 .pr_domain = &routedomain,
1978 .pr_flags = PR_ATOMIC|PR_ADDR,
1979 .pr_output = route_output,
1980 .pr_ctlinput = raw_ctlinput,
1981 .pr_init = raw_init,
1982 .pr_usrreqs = &route_usrreqs
1983 }
1984 };
1985
1986 static struct domain routedomain = {
1987 .dom_family = PF_ROUTE,
1988 .dom_name = "route",
1989 .dom_protosw = routesw,
1990 .dom_protoswNPROTOSW = &routesw[nitems(routesw)]
1991 };
1992
1993 VNET_DOMAIN_SET(route);
1994