sys/net/rtsock.c

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