sys/net/rtsock.c

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