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  * 4. 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_sctp.h"
  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/rwlock.h>
  49 #include <sys/signalvar.h>
  50 #include <sys/socket.h>
  51 #include <sys/socketvar.h>
  52 #include <sys/sysctl.h>
  53 #include <sys/systm.h>
  54
  55 #include <net/if.h>
  56 #include <net/if_dl.h>
  57 #include <net/if_llatbl.h>
  58 #include <net/netisr.h>
  59 #include <net/raw_cb.h>
  60 #include <net/route.h>
  61 #include <net/vnet.h>
  62
  63 #include <netinet/in.h>
  64 #include <netinet/if_ether.h>
  65 #ifdef INET6
  66 #include <netinet6/scope6_var.h>
  67 #endif
  68
  69 #if defined(INET) || defined(INET6)
  70 #ifdef SCTP
  71 extern void sctp_addr_change(struct ifaddr *ifa, int cmd);
  72 #endif /* SCTP */
  73 #endif
  74
  75 #ifdef COMPAT_FREEBSD32
  76 #include <sys/mount.h>
  77 #include <compat/freebsd32/freebsd32.h>
  78
  79 struct if_data32 {
  80         uint8_t ifi_type;
  81         uint8_t ifi_physical;
  82         uint8_t ifi_addrlen;
  83         uint8_t ifi_hdrlen;
  84         uint8_t ifi_link_state;
  85         uint8_t ifi_spare_char1;
  86         uint8_t ifi_spare_char2;
  87         uint8_t ifi_datalen;
  88         uint32_t ifi_mtu;
  89         uint32_t ifi_metric;
  90         uint32_t ifi_baudrate;
  91         uint32_t ifi_ipackets;
  92         uint32_t ifi_ierrors;
  93         uint32_t ifi_opackets;
  94         uint32_t ifi_oerrors;
  95         uint32_t ifi_collisions;
  96         uint32_t ifi_ibytes;
  97         uint32_t ifi_obytes;
  98         uint32_t ifi_imcasts;
  99         uint32_t ifi_omcasts;
 100         uint32_t ifi_iqdrops;
 101         uint32_t ifi_noproto;
 102         uint32_t ifi_hwassist;
 103         int32_t ifi_epoch;
 104         struct  timeval32 ifi_lastchange;
 105 };
 106
 107 struct if_msghdr32 {
 108         uint16_t ifm_msglen;
 109         uint8_t ifm_version;
 110         uint8_t ifm_type;
 111         int32_t ifm_addrs;
 112         int32_t ifm_flags;
 113         uint16_t ifm_index;
 114         struct  if_data32 ifm_data;
 115 };
 116 #endif
 117
 118 MALLOC_DEFINE(M_RTABLE, "routetbl", "routing tables");
 119
 120 /* NB: these are not modified */
 121 static struct   sockaddr route_src = { 2, PF_ROUTE, };
 122 static struct   sockaddr sa_zero   = { sizeof(sa_zero), AF_INET, };
 123
 124 static struct {
 125         int     ip_count;       /* attached w/ AF_INET */
 126         int     ip6_count;      /* attached w/ AF_INET6 */
 127         int     ipx_count;      /* attached w/ AF_IPX */
 128         int     any_count;      /* total attached */
 129 } route_cb;
 130
 131 struct mtx rtsock_mtx;
 132 MTX_SYSINIT(rtsock, &rtsock_mtx, "rtsock route_cb lock", MTX_DEF);
 133
 134 #define RTSOCK_LOCK()   mtx_lock(&rtsock_mtx)
 135 #define RTSOCK_UNLOCK() mtx_unlock(&rtsock_mtx)
 136 #define RTSOCK_LOCK_ASSERT()    mtx_assert(&rtsock_mtx, MA_OWNED)
 137
 138 SYSCTL_NODE(_net, OID_AUTO, route, CTLFLAG_RD, 0, "");
 139
 140 struct walkarg {
 141         int     w_tmemsize;
 142         int     w_op, w_arg;
 143         caddr_t w_tmem;
 144         struct sysctl_req *w_req;
 145 };
 146
 147 static void     rts_input(struct mbuf *m);
 148 static struct mbuf *rt_msg1(int type, struct rt_addrinfo *rtinfo);
 149 static int      rt_msg2(int type, struct rt_addrinfo *rtinfo,
 150                         caddr_t cp, struct walkarg *w);
 151 static int      rt_xaddrs(caddr_t cp, caddr_t cplim,
 152                         struct rt_addrinfo *rtinfo);
 153 static int      sysctl_dumpentry(struct radix_node *rn, void *vw);
 154 static int      sysctl_iflist(int af, struct walkarg *w);
 155 static int      sysctl_ifmalist(int af, struct walkarg *w);
 156 static int      route_output(struct mbuf *m, struct socket *so);
 157 static void     rt_setmetrics(u_long which, const struct rt_metrics *in,
 158                         struct rt_metrics_lite *out);
 159 static void     rt_getmetrics(const struct rt_metrics_lite *in,
 160                         struct rt_metrics *out);
 161 static void     rt_dispatch(struct mbuf *, const struct sockaddr *);
 162
 163 static struct netisr_handler rtsock_nh = {
 164         .nh_name = "rtsock",
 165         .nh_handler = rts_input,
 166         .nh_proto = NETISR_ROUTE,
 167         .nh_policy = NETISR_POLICY_SOURCE,
 168 };
 169
 170 static int
 171 sysctl_route_netisr_maxqlen(SYSCTL_HANDLER_ARGS)
 172 {
 173         int error, qlimit;
 174
 175         netisr_getqlimit(&rtsock_nh, &qlimit);
 176         error = sysctl_handle_int(oidp, &qlimit, 0, req);
 177         if (error || !req->newptr)
 178                 return (error);
 179         if (qlimit < 1)
 180                 return (EINVAL);
 181         return (netisr_setqlimit(&rtsock_nh, qlimit));
 182 }
 183 SYSCTL_PROC(_net_route, OID_AUTO, netisr_maxqlen, CTLTYPE_INT|CTLFLAG_RW,
 184     0, 0, sysctl_route_netisr_maxqlen, "I",
 185     "maximum routing socket dispatch queue length");
 186
 187 static void
 188 rts_init(void)
 189 {
 190         int tmp;
 191
 192         if (TUNABLE_INT_FETCH("net.route.netisr_maxqlen", &tmp))
 193                 rtsock_nh.nh_qlimit = tmp;
 194         netisr_register(&rtsock_nh);
 195 }
 196 SYSINIT(rtsock, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, rts_init, 0);
 197
 198 static void
 199 rts_input(struct mbuf *m)
 200 {
 201         struct sockproto route_proto;
 202         unsigned short *family;
 203         struct m_tag *tag;
 204
 205         route_proto.sp_family = PF_ROUTE;
 206         tag = m_tag_find(m, PACKET_TAG_RTSOCKFAM, NULL);
 207         if (tag != NULL) {
 208                 family = (unsigned short *)(tag + 1);
 209                 route_proto.sp_protocol = *family;
 210                 m_tag_delete(m, tag);
 211         } else
 212                 route_proto.sp_protocol = 0;
 213
 214         raw_input(m, &route_proto, &route_src);
 215 }
 216
 217 /*
 218  * It really doesn't make any sense at all for this code to share much
 219  * with raw_usrreq.c, since its functionality is so restricted.  XXX
 220  */
 221 static void
 222 rts_abort(struct socket *so)
 223 {
 224
 225         raw_usrreqs.pru_abort(so);
 226 }
 227
 228 static void
 229 rts_close(struct socket *so)
 230 {
 231
 232         raw_usrreqs.pru_close(so);
 233 }
 234
 235 /* pru_accept is EOPNOTSUPP */
 236
 237 static int
 238 rts_attach(struct socket *so, int proto, struct thread *td)
 239 {
 240         struct rawcb *rp;
 241         int s, error;
 242
 243         KASSERT(so->so_pcb == NULL, ("rts_attach: so_pcb != NULL"));
 244
 245         /* XXX */
 246         rp = malloc(sizeof *rp, M_PCB, M_WAITOK | M_ZERO);
 247         if (rp == NULL)
 248                 return ENOBUFS;
 249
 250         /*
 251          * The splnet() is necessary to block protocols from sending
 252          * error notifications (like RTM_REDIRECT or RTM_LOSING) while
 253          * this PCB is extant but incompletely initialized.
 254          * Probably we should try to do more of this work beforehand and
 255          * eliminate the spl.
 256          */
 257         s = splnet();
 258         so->so_pcb = (caddr_t)rp;
 259         so->so_fibnum = td->td_proc->p_fibnum;
 260         error = raw_attach(so, proto);
 261         rp = sotorawcb(so);
 262         if (error) {
 263                 splx(s);
 264                 so->so_pcb = NULL;
 265                 free(rp, M_PCB);
 266                 return error;
 267         }
 268         RTSOCK_LOCK();
 269         switch(rp->rcb_proto.sp_protocol) {
 270         case AF_INET:
 271                 route_cb.ip_count++;
 272                 break;
 273         case AF_INET6:
 274                 route_cb.ip6_count++;
 275                 break;
 276         case AF_IPX:
 277                 route_cb.ipx_count++;
 278                 break;
 279         }
 280         route_cb.any_count++;
 281         RTSOCK_UNLOCK();
 282         soisconnected(so);
 283         so->so_options |= SO_USELOOPBACK;
 284         splx(s);
 285         return 0;
 286 }
 287
 288 static int
 289 rts_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 290 {
 291
 292         return (raw_usrreqs.pru_bind(so, nam, td)); /* xxx just EINVAL */
 293 }
 294
 295 static int
 296 rts_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 297 {
 298
 299         return (raw_usrreqs.pru_connect(so, nam, td)); /* XXX just EINVAL */
 300 }
 301
 302 /* pru_connect2 is EOPNOTSUPP */
 303 /* pru_control is EOPNOTSUPP */
 304
 305 static void
 306 rts_detach(struct socket *so)
 307 {
 308         struct rawcb *rp = sotorawcb(so);
 309
 310         KASSERT(rp != NULL, ("rts_detach: rp == NULL"));
 311
 312         RTSOCK_LOCK();
 313         switch(rp->rcb_proto.sp_protocol) {
 314         case AF_INET:
 315                 route_cb.ip_count--;
 316                 break;
 317         case AF_INET6:
 318                 route_cb.ip6_count--;
 319                 break;
 320         case AF_IPX:
 321                 route_cb.ipx_count--;
 322                 break;
 323         }
 324         route_cb.any_count--;
 325         RTSOCK_UNLOCK();
 326         raw_usrreqs.pru_detach(so);
 327 }
 328
 329 static int
 330 rts_disconnect(struct socket *so)
 331 {
 332
 333         return (raw_usrreqs.pru_disconnect(so));
 334 }
 335
 336 /* pru_listen is EOPNOTSUPP */
 337
 338 static int
 339 rts_peeraddr(struct socket *so, struct sockaddr **nam)
 340 {
 341
 342         return (raw_usrreqs.pru_peeraddr(so, nam));
 343 }
 344
 345 /* pru_rcvd is EOPNOTSUPP */
 346 /* pru_rcvoob is EOPNOTSUPP */
 347
 348 static int
 349 rts_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
 350          struct mbuf *control, struct thread *td)
 351 {
 352
 353         return (raw_usrreqs.pru_send(so, flags, m, nam, control, td));
 354 }
 355
 356 /* pru_sense is null */
 357
 358 static int
 359 rts_shutdown(struct socket *so)
 360 {
 361
 362         return (raw_usrreqs.pru_shutdown(so));
 363 }
 364
 365 static int
 366 rts_sockaddr(struct socket *so, struct sockaddr **nam)
 367 {
 368
 369         return (raw_usrreqs.pru_sockaddr(so, nam));
 370 }
 371
 372 static struct pr_usrreqs route_usrreqs = {
 373         .pru_abort =            rts_abort,
 374         .pru_attach =           rts_attach,
 375         .pru_bind =             rts_bind,
 376         .pru_connect =          rts_connect,
 377         .pru_detach =           rts_detach,
 378         .pru_disconnect =       rts_disconnect,
 379         .pru_peeraddr =         rts_peeraddr,
 380         .pru_send =             rts_send,
 381         .pru_shutdown =         rts_shutdown,
 382         .pru_sockaddr =         rts_sockaddr,
 383         .pru_close =            rts_close,
 384 };
 385
 386 #ifndef _SOCKADDR_UNION_DEFINED
 387 #define _SOCKADDR_UNION_DEFINED
 388 /*
 389  * The union of all possible address formats we handle.
 390  */
 391 union sockaddr_union {
 392         struct sockaddr         sa;
 393         struct sockaddr_in      sin;
 394         struct sockaddr_in6     sin6;
 395 };
 396 #endif /* _SOCKADDR_UNION_DEFINED */
 397
 398 static int
 399 rtm_get_jailed(struct rt_addrinfo *info, struct ifnet *ifp,
 400     struct rtentry *rt, union sockaddr_union *saun, struct ucred *cred)
 401 {
 402
 403         /* First, see if the returned address is part of the jail. */
 404         if (prison_if(cred, rt->rt_ifa->ifa_addr) == 0) {
 405                 info->rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
 406                 return (0);
 407         }
 408
 409         switch (info->rti_info[RTAX_DST]->sa_family) {
 410 #ifdef INET
 411         case AF_INET:
 412         {
 413                 struct in_addr ia;
 414                 struct ifaddr *ifa;
 415                 int found;
 416
 417                 found = 0;
 418                 /*
 419                  * Try to find an address on the given outgoing interface
 420                  * that belongs to the jail.
 421                  */
 422                 IF_ADDR_LOCK(ifp);
 423                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 424                         struct sockaddr *sa;
 425                         sa = ifa->ifa_addr;
 426                         if (sa->sa_family != AF_INET)
 427                                 continue;
 428                         ia = ((struct sockaddr_in *)sa)->sin_addr;
 429                         if (prison_check_ip4(cred, &ia) == 0) {
 430                                 found = 1;
 431                                 break;
 432                         }
 433                 }
 434                 IF_ADDR_UNLOCK(ifp);
 435                 if (!found) {
 436                         /*
 437                          * As a last resort return the 'default' jail address.
 438                          */
 439                         ia = ((struct sockaddr_in *)rt->rt_ifa->ifa_addr)->
 440                             sin_addr;
 441                         if (prison_get_ip4(cred, &ia) != 0)
 442                                 return (ESRCH);
 443                 }
 444                 bzero(&saun->sin, sizeof(struct sockaddr_in));
 445                 saun->sin.sin_len = sizeof(struct sockaddr_in);
 446                 saun->sin.sin_family = AF_INET;
 447                 saun->sin.sin_addr.s_addr = ia.s_addr;
 448                 info->rti_info[RTAX_IFA] = (struct sockaddr *)&saun->sin;
 449                 break;
 450         }
 451 #endif
 452 #ifdef INET6
 453         case AF_INET6:
 454         {
 455                 struct in6_addr ia6;
 456                 struct ifaddr *ifa;
 457                 int found;
 458
 459                 found = 0;
 460                 /*
 461                  * Try to find an address on the given outgoing interface
 462                  * that belongs to the jail.
 463                  */
 464                 IF_ADDR_LOCK(ifp);
 465                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 466                         struct sockaddr *sa;
 467                         sa = ifa->ifa_addr;
 468                         if (sa->sa_family != AF_INET6)
 469                                 continue;
 470                         bcopy(&((struct sockaddr_in6 *)sa)->sin6_addr,
 471                             &ia6, sizeof(struct in6_addr));
 472                         if (prison_check_ip6(cred, &ia6) == 0) {
 473                                 found = 1;
 474                                 break;
 475                         }
 476                 }
 477                 IF_ADDR_UNLOCK(ifp);
 478                 if (!found) {
 479                         /*
 480                          * As a last resort return the 'default' jail address.
 481                          */
 482                         ia6 = ((struct sockaddr_in6 *)rt->rt_ifa->ifa_addr)->
 483                             sin6_addr;
 484                         if (prison_get_ip6(cred, &ia6) != 0)
 485                                 return (ESRCH);
 486                 }
 487                 bzero(&saun->sin6, sizeof(struct sockaddr_in6));
 488                 saun->sin6.sin6_len = sizeof(struct sockaddr_in6);
 489                 saun->sin6.sin6_family = AF_INET6;
 490                 bcopy(&ia6, &saun->sin6.sin6_addr, sizeof(struct in6_addr));
 491                 if (sa6_recoverscope(&saun->sin6) != 0)
 492                         return (ESRCH);
 493                 info->rti_info[RTAX_IFA] = (struct sockaddr *)&saun->sin6;
 494                 break;
 495         }
 496 #endif
 497         default:
 498                 return (ESRCH);
 499         }
 500         return (0);
 501 }
 502
 503 /*ARGSUSED*/
 504 static int
 505 route_output(struct mbuf *m, struct socket *so)
 506 {
 507 #define sa_equal(a1, a2) (bcmp((a1), (a2), (a1)->sa_len) == 0)
 508         struct rt_msghdr *rtm = NULL;
 509         struct rtentry *rt = NULL;
 510         struct radix_node_head *rnh;
 511         struct rt_addrinfo info;
 512         int len, error = 0;
 513         struct ifnet *ifp = NULL;
 514         union sockaddr_union saun;
 515
 516 #define senderr(e) { error = e; goto flush;}
 517         if (m == NULL || ((m->m_len < sizeof(long)) &&
 518                        (m = m_pullup(m, sizeof(long))) == NULL))
 519                 return (ENOBUFS);
 520         if ((m->m_flags & M_PKTHDR) == 0)
 521                 panic("route_output");
 522         len = m->m_pkthdr.len;
 523         if (len < sizeof(*rtm) ||
 524             len != mtod(m, struct rt_msghdr *)->rtm_msglen) {
 525                 info.rti_info[RTAX_DST] = NULL;
 526                 senderr(EINVAL);
 527         }
 528         R_Malloc(rtm, struct rt_msghdr *, len);
 529         if (rtm == NULL) {
 530                 info.rti_info[RTAX_DST] = NULL;
 531                 senderr(ENOBUFS);
 532         }
 533         m_copydata(m, 0, len, (caddr_t)rtm);
 534         if (rtm->rtm_version != RTM_VERSION) {
 535                 info.rti_info[RTAX_DST] = NULL;
 536                 senderr(EPROTONOSUPPORT);
 537         }
 538         rtm->rtm_pid = curproc->p_pid;
 539         bzero(&info, sizeof(info));
 540         info.rti_addrs = rtm->rtm_addrs;
 541         if (rt_xaddrs((caddr_t)(rtm + 1), len + (caddr_t)rtm, &info)) {
 542                 info.rti_info[RTAX_DST] = NULL;
 543                 senderr(EINVAL);
 544         }
 545         info.rti_flags = rtm->rtm_flags;
 546         if (info.rti_info[RTAX_DST] == NULL ||
 547             info.rti_info[RTAX_DST]->sa_family >= AF_MAX ||
 548             (info.rti_info[RTAX_GATEWAY] != NULL &&
 549              info.rti_info[RTAX_GATEWAY]->sa_family >= AF_MAX))
 550                 senderr(EINVAL);
 551         /*
 552          * Verify that the caller has the appropriate privilege; RTM_GET
 553          * is the only operation the non-superuser is allowed.
 554          */
 555         if (rtm->rtm_type != RTM_GET) {
 556                 error = priv_check(curthread, PRIV_NET_ROUTE);
 557                 if (error)
 558                         senderr(error);
 559         }
 560
 561         /*
 562          * The given gateway address may be an interface address.
 563          * For example, issuing a "route change" command on a route
 564          * entry that was created from a tunnel, and the gateway
 565          * address given is the local end point. In this case the
 566          * RTF_GATEWAY flag must be cleared or the destination will
 567          * not be reachable even though there is no error message.
 568          */
 569         if (info.rti_info[RTAX_GATEWAY] != NULL &&
 570             info.rti_info[RTAX_GATEWAY]->sa_family != AF_LINK) {
 571                 struct route gw_ro;
 572
 573                 bzero(&gw_ro, sizeof(gw_ro));
 574                 gw_ro.ro_dst = *info.rti_info[RTAX_GATEWAY];
 575                 rtalloc_ign_fib(&gw_ro, 0, so->so_fibnum);
 576                 /*
 577                  * A host route through the loopback interface is
 578                  * installed for each interface adddress. In pre 8.0
 579                  * releases the interface address of a PPP link type
 580                  * is not reachable locally. This behavior is fixed as
 581                  * part of the new L2/L3 redesign and rewrite work. The
 582                  * signature of this interface address route is the
 583                  * AF_LINK sa_family type of the rt_gateway, and the
 584                  * rt_ifp has the IFF_LOOPBACK flag set.
 585                  */
 586                 if (gw_ro.ro_rt != NULL &&
 587                     gw_ro.ro_rt->rt_gateway->sa_family == AF_LINK &&
 588                     gw_ro.ro_rt->rt_ifp->if_flags & IFF_LOOPBACK)
 589                         info.rti_flags &= ~RTF_GATEWAY;
 590                 if (gw_ro.ro_rt != NULL)
 591                         RTFREE(gw_ro.ro_rt);
 592         }
 593
 594         switch (rtm->rtm_type) {
 595                 struct rtentry *saved_nrt;
 596
 597         case RTM_ADD:
 598                 if (info.rti_info[RTAX_GATEWAY] == NULL)
 599                         senderr(EINVAL);
 600                 saved_nrt = NULL;
 601
 602                 /* support for new ARP code */
 603                 if (info.rti_info[RTAX_GATEWAY]->sa_family == AF_LINK &&
 604                     (rtm->rtm_flags & RTF_LLDATA) != 0) {
 605                         error = lla_rt_output(rtm, &info);
 606                         break;
 607                 }
 608                 error = rtrequest1_fib(RTM_ADD, &info, &saved_nrt,
 609                     so->so_fibnum);
 610                 if (error == 0 && saved_nrt) {
 611                         RT_LOCK(saved_nrt);
 612                         rt_setmetrics(rtm->rtm_inits,
 613                                 &rtm->rtm_rmx, &saved_nrt->rt_rmx);
 614                         rtm->rtm_index = saved_nrt->rt_ifp->if_index;
 615                         RT_REMREF(saved_nrt);
 616                         RT_UNLOCK(saved_nrt);
 617                 }
 618                 break;
 619
 620         case RTM_DELETE:
 621                 saved_nrt = NULL;
 622                 /* support for new ARP code */
 623                 if (info.rti_info[RTAX_GATEWAY] &&
 624                     (info.rti_info[RTAX_GATEWAY]->sa_family == AF_LINK) &&
 625                     (rtm->rtm_flags & RTF_LLDATA) != 0) {
 626                         error = lla_rt_output(rtm, &info);
 627                         break;
 628                 }
 629                 error = rtrequest1_fib(RTM_DELETE, &info, &saved_nrt,
 630                     so->so_fibnum);
 631                 if (error == 0) {
 632                         RT_LOCK(saved_nrt);
 633                         rt = saved_nrt;
 634                         goto report;
 635                 }
 636                 break;
 637
 638         case RTM_GET:
 639         case RTM_CHANGE:
 640         case RTM_LOCK:
 641                 rnh = rt_tables_get_rnh(so->so_fibnum,
 642                     info.rti_info[RTAX_DST]->sa_family);
 643                 if (rnh == NULL)
 644                         senderr(EAFNOSUPPORT);
 645                 RADIX_NODE_HEAD_RLOCK(rnh);
 646                 rt = (struct rtentry *) rnh->rnh_lookup(info.rti_info[RTAX_DST],
 647                         info.rti_info[RTAX_NETMASK], rnh);
 648                 if (rt == NULL) {       /* XXX looks bogus */
 649                         RADIX_NODE_HEAD_RUNLOCK(rnh);
 650                         senderr(ESRCH);
 651                 }
 652 #ifdef RADIX_MPATH
 653                 /*
 654                  * for RTM_CHANGE/LOCK, if we got multipath routes,
 655                  * we require users to specify a matching RTAX_GATEWAY.
 656                  *
 657                  * for RTM_GET, gate is optional even with multipath.
 658                  * if gate == NULL the first match is returned.
 659                  * (no need to call rt_mpath_matchgate if gate == NULL)
 660                  */
 661                 if (rn_mpath_capable(rnh) &&
 662                     (rtm->rtm_type != RTM_GET || info.rti_info[RTAX_GATEWAY])) {
 663                         rt = rt_mpath_matchgate(rt, info.rti_info[RTAX_GATEWAY]);
 664                         if (!rt) {
 665                                 RADIX_NODE_HEAD_RUNLOCK(rnh);
 666                                 senderr(ESRCH);
 667                         }
 668                 }
 669 #endif
 670                 /*
 671                  * If performing proxied L2 entry insertion, and
 672                  * the actual PPP host entry is found, perform
 673                  * another search to retrieve the prefix route of
 674                  * the local end point of the PPP link.
 675                  */
 676                 if ((rtm->rtm_flags & RTF_ANNOUNCE) &&
 677                     (rt->rt_ifp->if_flags & IFF_POINTOPOINT)) {
 678                         struct sockaddr laddr;
 679                         rt_maskedcopy(rt->rt_ifa->ifa_addr,
 680                                       &laddr,
 681                                       rt->rt_ifa->ifa_netmask);
 682                         /*
 683                          * refactor rt and no lock operation necessary
 684                          */
 685                         rt = (struct rtentry *)rnh->rnh_matchaddr(&laddr, rnh);
 686                         if (rt == NULL) {
 687                                 RADIX_NODE_HEAD_RUNLOCK(rnh);
 688                                 senderr(ESRCH);
 689                         }
 690                 }
 691                 RT_LOCK(rt);
 692                 RT_ADDREF(rt);
 693                 RADIX_NODE_HEAD_RUNLOCK(rnh);
 694
 695                 /*
 696                  * Fix for PR: 82974
 697                  *
 698                  * RTM_CHANGE/LOCK need a perfect match, rn_lookup()
 699                  * returns a perfect match in case a netmask is
 700                  * specified.  For host routes only a longest prefix
 701                  * match is returned so it is necessary to compare the
 702                  * existence of the netmask.  If both have a netmask
 703                  * rnh_lookup() did a perfect match and if none of them
 704                  * have a netmask both are host routes which is also a
 705                  * perfect match.
 706                  */
 707
 708                 if (rtm->rtm_type != RTM_GET &&
 709                     (!rt_mask(rt) != !info.rti_info[RTAX_NETMASK])) {
 710                         RT_UNLOCK(rt);
 711                         senderr(ESRCH);
 712                 }
 713
 714                 switch(rtm->rtm_type) {
 715
 716                 case RTM_GET:
 717                 report:
 718                         RT_LOCK_ASSERT(rt);
 719                         if ((rt->rt_flags & RTF_HOST) == 0
 720                             ? jailed_without_vnet(curthread->td_ucred)
 721                             : prison_if(curthread->td_ucred,
 722                             rt_key(rt)) != 0) {
 723                                 RT_UNLOCK(rt);
 724                                 senderr(ESRCH);
 725                         }
 726                         info.rti_info[RTAX_DST] = rt_key(rt);
 727                         info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
 728                         info.rti_info[RTAX_NETMASK] = rt_mask(rt);
 729                         info.rti_info[RTAX_GENMASK] = 0;
 730                         if (rtm->rtm_addrs & (RTA_IFP | RTA_IFA)) {
 731                                 ifp = rt->rt_ifp;
 732                                 if (ifp) {
 733                                         info.rti_info[RTAX_IFP] =
 734                                             ifp->if_addr->ifa_addr;
 735                                         error = rtm_get_jailed(&info, ifp, rt,
 736                                             &saun, curthread->td_ucred);
 737                                         if (error != 0) {
 738                                                 RT_UNLOCK(rt);
 739                                                 senderr(error);
 740                                         }
 741                                         if (ifp->if_flags & IFF_POINTOPOINT)
 742                                                 info.rti_info[RTAX_BRD] =
 743                                                     rt->rt_ifa->ifa_dstaddr;
 744                                         rtm->rtm_index = ifp->if_index;
 745                                 } else {
 746                                         info.rti_info[RTAX_IFP] = NULL;
 747                                         info.rti_info[RTAX_IFA] = NULL;
 748                                 }
 749                         } else if ((ifp = rt->rt_ifp) != NULL) {
 750                                 rtm->rtm_index = ifp->if_index;
 751                         }
 752                         len = rt_msg2(rtm->rtm_type, &info, NULL, NULL);
 753                         if (len > rtm->rtm_msglen) {
 754                                 struct rt_msghdr *new_rtm;
 755                                 R_Malloc(new_rtm, struct rt_msghdr *, len);
 756                                 if (new_rtm == NULL) {
 757                                         RT_UNLOCK(rt);
 758                                         senderr(ENOBUFS);
 759                                 }
 760                                 bcopy(rtm, new_rtm, rtm->rtm_msglen);
 761                                 Free(rtm); rtm = new_rtm;
 762                         }
 763                         (void)rt_msg2(rtm->rtm_type, &info, (caddr_t)rtm, NULL);
 764                         rtm->rtm_flags = rt->rt_flags;
 765                         rt_getmetrics(&rt->rt_rmx, &rtm->rtm_rmx);
 766                         rtm->rtm_addrs = info.rti_addrs;
 767                         break;
 768
 769                 case RTM_CHANGE:
 770                         /*
 771                          * New gateway could require new ifaddr, ifp;
 772                          * flags may also be different; ifp may be specified
 773                          * by ll sockaddr when protocol address is ambiguous
 774                          */
 775                         if (((rt->rt_flags & RTF_GATEWAY) &&
 776                              info.rti_info[RTAX_GATEWAY] != NULL) ||
 777                             info.rti_info[RTAX_IFP] != NULL ||
 778                             (info.rti_info[RTAX_IFA] != NULL &&
 779                              !sa_equal(info.rti_info[RTAX_IFA],
 780                                        rt->rt_ifa->ifa_addr))) {
 781                                 RT_UNLOCK(rt);
 782                                 RADIX_NODE_HEAD_LOCK(rnh);
 783                                 error = rt_getifa_fib(&info, rt->rt_fibnum);
 784                                 /*
 785                                  * XXXRW: Really we should release this
 786                                  * reference later, but this maintains
 787                                  * historical behavior.
 788                                  */
 789                                 if (info.rti_ifa != NULL)
 790                                         ifa_free(info.rti_ifa);
 791                                 RADIX_NODE_HEAD_UNLOCK(rnh);
 792                                 if (error != 0)
 793                                         senderr(error);
 794                                 RT_LOCK(rt);
 795                         }
 796                         if (info.rti_ifa != NULL &&
 797                             info.rti_ifa != rt->rt_ifa &&
 798                             rt->rt_ifa != NULL &&
 799                             rt->rt_ifa->ifa_rtrequest != NULL) {
 800                                 rt->rt_ifa->ifa_rtrequest(RTM_DELETE, rt,
 801                                     &info);
 802                                 ifa_free(rt->rt_ifa);
 803                         }
 804                         if (info.rti_info[RTAX_GATEWAY] != NULL) {
 805                                 RT_UNLOCK(rt);
 806                                 RADIX_NODE_HEAD_LOCK(rnh);
 807                                 RT_LOCK(rt);
 808
 809                                 error = rt_setgate(rt, rt_key(rt),
 810                                     info.rti_info[RTAX_GATEWAY]);
 811                                 RADIX_NODE_HEAD_UNLOCK(rnh);
 812                                 if (error != 0) {
 813                                         RT_UNLOCK(rt);
 814                                         senderr(error);
 815                                 }
 816                                 rt->rt_flags |= (RTF_GATEWAY & info.rti_flags);
 817                         }
 818                         if (info.rti_ifa != NULL &&
 819                             info.rti_ifa != rt->rt_ifa) {
 820                                 ifa_ref(info.rti_ifa);
 821                                 rt->rt_ifa = info.rti_ifa;
 822                                 rt->rt_ifp = info.rti_ifp;
 823                         }
 824                         /* Allow some flags to be toggled on change. */
 825                         rt->rt_flags = (rt->rt_flags & ~RTF_FMASK) |
 826                                     (rtm->rtm_flags & RTF_FMASK);
 827                         rt_setmetrics(rtm->rtm_inits, &rtm->rtm_rmx,
 828                                         &rt->rt_rmx);
 829                         rtm->rtm_index = rt->rt_ifp->if_index;
 830                         if (rt->rt_ifa && rt->rt_ifa->ifa_rtrequest)
 831                                rt->rt_ifa->ifa_rtrequest(RTM_ADD, rt, &info);
 832                         /* FALLTHROUGH */
 833                 case RTM_LOCK:
 834                         /* We don't support locks anymore */
 835                         break;
 836                 }
 837                 RT_UNLOCK(rt);
 838                 break;
 839
 840         default:
 841                 senderr(EOPNOTSUPP);
 842         }
 843
 844 flush:
 845         if (rtm) {
 846                 if (error)
 847                         rtm->rtm_errno = error;
 848                 else
 849                         rtm->rtm_flags |= RTF_DONE;
 850         }
 851         if (rt)         /* XXX can this be true? */
 852                 RTFREE(rt);
 853     {
 854         struct rawcb *rp = NULL;
 855         /*
 856          * Check to see if we don't want our own messages.
 857          */
 858         if ((so->so_options & SO_USELOOPBACK) == 0) {
 859                 if (route_cb.any_count <= 1) {
 860                         if (rtm)
 861                                 Free(rtm);
 862                         m_freem(m);
 863                         return (error);
 864                 }
 865                 /* There is another listener, so construct message */
 866                 rp = sotorawcb(so);
 867         }
 868         if (rtm) {
 869                 m_copyback(m, 0, rtm->rtm_msglen, (caddr_t)rtm);
 870                 if (m->m_pkthdr.len < rtm->rtm_msglen) {
 871                         m_freem(m);
 872                         m = NULL;
 873                 } else if (m->m_pkthdr.len > rtm->rtm_msglen)
 874                         m_adj(m, rtm->rtm_msglen - m->m_pkthdr.len);
 875                 Free(rtm);
 876         }
 877         if (m) {
 878                 if (rp) {
 879                         /*
 880                          * XXX insure we don't get a copy by
 881                          * invalidating our protocol
 882                          */
 883                         unsigned short family = rp->rcb_proto.sp_family;
 884                         rp->rcb_proto.sp_family = 0;
 885                         rt_dispatch(m, info.rti_info[RTAX_DST]);
 886                         rp->rcb_proto.sp_family = family;
 887                 } else
 888                         rt_dispatch(m, info.rti_info[RTAX_DST]);
 889         }
 890     }
 891         return (error);
 892 #undef  sa_equal
 893 }
 894
 895 static void
 896 rt_setmetrics(u_long which, const struct rt_metrics *in,
 897         struct rt_metrics_lite *out)
 898 {
 899 #define metric(f, e) if (which & (f)) out->e = in->e;
 900         /*
 901          * Only these are stored in the routing entry since introduction
 902          * of tcp hostcache. The rest is ignored.
 903          */
 904         metric(RTV_MTU, rmx_mtu);
 905         metric(RTV_WEIGHT, rmx_weight);
 906         /* Userland -> kernel timebase conversion. */
 907         if (which & RTV_EXPIRE)
 908                 out->rmx_expire = in->rmx_expire ?
 909                     in->rmx_expire - time_second + time_uptime : 0;
 910 #undef metric
 911 }
 912
 913 static void
 914 rt_getmetrics(const struct rt_metrics_lite *in, struct rt_metrics *out)
 915 {
 916 #define metric(e) out->e = in->e;
 917         bzero(out, sizeof(*out));
 918         metric(rmx_mtu);
 919         metric(rmx_weight);
 920         /* Kernel -> userland timebase conversion. */
 921         out->rmx_expire = in->rmx_expire ?
 922             in->rmx_expire - time_uptime + time_second : 0;
 923 #undef metric
 924 }
 925
 926 /*
 927  * Extract the addresses of the passed sockaddrs.
 928  * Do a little sanity checking so as to avoid bad memory references.
 929  * This data is derived straight from userland.
 930  */
 931 static int
 932 rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo)
 933 {
 934         struct sockaddr *sa;
 935         int i;
 936
 937         for (i = 0; i < RTAX_MAX && cp < cplim; i++) {
 938                 if ((rtinfo->rti_addrs & (1 << i)) == 0)
 939                         continue;
 940                 sa = (struct sockaddr *)cp;
 941                 /*
 942                  * It won't fit.
 943                  */
 944                 if (cp + sa->sa_len > cplim)
 945                         return (EINVAL);
 946                 /*
 947                  * there are no more.. quit now
 948                  * If there are more bits, they are in error.
 949                  * I've seen this. route(1) can evidently generate these.
 950                  * This causes kernel to core dump.
 951                  * for compatibility, If we see this, point to a safe address.
 952                  */
 953                 if (sa->sa_len == 0) {
 954                         rtinfo->rti_info[i] = &sa_zero;
 955                         return (0); /* should be EINVAL but for compat */
 956                 }
 957                 /* accept it */
 958                 rtinfo->rti_info[i] = sa;
 959                 cp += SA_SIZE(sa);
 960         }
 961         return (0);
 962 }
 963
 964 static struct mbuf *
 965 rt_msg1(int type, struct rt_addrinfo *rtinfo)
 966 {
 967         struct rt_msghdr *rtm;
 968         struct mbuf *m;
 969         int i;
 970         struct sockaddr *sa;
 971         int len, dlen;
 972
 973         switch (type) {
 974
 975         case RTM_DELADDR:
 976         case RTM_NEWADDR:
 977                 len = sizeof(struct ifa_msghdr);
 978                 break;
 979
 980         case RTM_DELMADDR:
 981         case RTM_NEWMADDR:
 982                 len = sizeof(struct ifma_msghdr);
 983                 break;
 984
 985         case RTM_IFINFO:
 986                 len = sizeof(struct if_msghdr);
 987                 break;
 988
 989         case RTM_IFANNOUNCE:
 990         case RTM_IEEE80211:
 991                 len = sizeof(struct if_announcemsghdr);
 992                 break;
 993
 994         default:
 995                 len = sizeof(struct rt_msghdr);
 996         }
 997         if (len > MCLBYTES)
 998                 panic("rt_msg1");
 999         m = m_gethdr(M_DONTWAIT, MT_DATA);
1000         if (m && len > MHLEN) {
1001                 MCLGET(m, M_DONTWAIT);
1002                 if ((m->m_flags & M_EXT) == 0) {
1003                         m_free(m);
1004                         m = NULL;
1005                 }
1006         }
1007         if (m == NULL)
1008                 return (m);
1009         m->m_pkthdr.len = m->m_len = len;
1010         m->m_pkthdr.rcvif = NULL;
1011         rtm = mtod(m, struct rt_msghdr *);
1012         bzero((caddr_t)rtm, len);
1013         for (i = 0; i < RTAX_MAX; i++) {
1014                 if ((sa = rtinfo->rti_info[i]) == NULL)
1015                         continue;
1016                 rtinfo->rti_addrs |= (1 << i);
1017                 dlen = SA_SIZE(sa);
1018                 m_copyback(m, len, dlen, (caddr_t)sa);
1019                 len += dlen;
1020         }
1021         if (m->m_pkthdr.len != len) {
1022                 m_freem(m);
1023                 return (NULL);
1024         }
1025         rtm->rtm_msglen = len;
1026         rtm->rtm_version = RTM_VERSION;
1027         rtm->rtm_type = type;
1028         return (m);
1029 }
1030
1031 static int
1032 rt_msg2(int type, struct rt_addrinfo *rtinfo, caddr_t cp, struct walkarg *w)
1033 {
1034         int i;
1035         int len, dlen, second_time = 0;
1036         caddr_t cp0;
1037
1038         rtinfo->rti_addrs = 0;
1039 again:
1040         switch (type) {
1041
1042         case RTM_DELADDR:
1043         case RTM_NEWADDR:
1044                 len = sizeof(struct ifa_msghdr);
1045                 break;
1046
1047         case RTM_IFINFO:
1048 #ifdef COMPAT_FREEBSD32
1049                 if (w != NULL && w->w_req->flags & SCTL_MASK32) {
1050                         len = sizeof(struct if_msghdr32);
1051                         break;
1052                 }
1053 #endif
1054                 len = sizeof(struct if_msghdr);
1055                 break;
1056
1057         case RTM_NEWMADDR:
1058                 len = sizeof(struct ifma_msghdr);
1059                 break;
1060
1061         default:
1062                 len = sizeof(struct rt_msghdr);
1063         }
1064         cp0 = cp;
1065         if (cp0)
1066                 cp += len;
1067         for (i = 0; i < RTAX_MAX; i++) {
1068                 struct sockaddr *sa;
1069
1070                 if ((sa = rtinfo->rti_info[i]) == NULL)
1071                         continue;
1072                 rtinfo->rti_addrs |= (1 << i);
1073                 dlen = SA_SIZE(sa);
1074                 if (cp) {
1075                         bcopy((caddr_t)sa, cp, (unsigned)dlen);
1076                         cp += dlen;
1077                 }
1078                 len += dlen;
1079         }
1080         len = ALIGN(len);
1081         if (cp == NULL && w != NULL && !second_time) {
1082                 struct walkarg *rw = w;
1083
1084                 if (rw->w_req) {
1085                         if (rw->w_tmemsize < len) {
1086                                 if (rw->w_tmem)
1087                                         free(rw->w_tmem, M_RTABLE);
1088                                 rw->w_tmem = (caddr_t)
1089                                         malloc(len, M_RTABLE, M_NOWAIT);
1090                                 if (rw->w_tmem)
1091                                         rw->w_tmemsize = len;
1092                         }
1093                         if (rw->w_tmem) {
1094                                 cp = rw->w_tmem;
1095                                 second_time = 1;
1096                                 goto again;
1097                         }
1098                 }
1099         }
1100         if (cp) {
1101                 struct rt_msghdr *rtm = (struct rt_msghdr *)cp0;
1102
1103                 rtm->rtm_version = RTM_VERSION;
1104                 rtm->rtm_type = type;
1105                 rtm->rtm_msglen = len;
1106         }
1107         return (len);
1108 }
1109
1110 /*
1111  * This routine is called to generate a message from the routing
1112  * socket indicating that a redirect has occured, a routing lookup
1113  * has failed, or that a protocol has detected timeouts to a particular
1114  * destination.
1115  */
1116 void
1117 rt_missmsg(int type, struct rt_addrinfo *rtinfo, int flags, int error)
1118 {
1119         struct rt_msghdr *rtm;
1120         struct mbuf *m;
1121         struct sockaddr *sa = rtinfo->rti_info[RTAX_DST];
1122
1123         if (route_cb.any_count == 0)
1124                 return;
1125         m = rt_msg1(type, rtinfo);
1126         if (m == NULL)
1127                 return;
1128         rtm = mtod(m, struct rt_msghdr *);
1129         rtm->rtm_flags = RTF_DONE | flags;
1130         rtm->rtm_errno = error;
1131         rtm->rtm_addrs = rtinfo->rti_addrs;
1132         rt_dispatch(m, sa);
1133 }
1134
1135 /*
1136  * This routine is called to generate a message from the routing
1137  * socket indicating that the status of a network interface has changed.
1138  */
1139 void
1140 rt_ifmsg(struct ifnet *ifp)
1141 {
1142         struct if_msghdr *ifm;
1143         struct mbuf *m;
1144         struct rt_addrinfo info;
1145
1146         if (route_cb.any_count == 0)
1147                 return;
1148         bzero((caddr_t)&info, sizeof(info));
1149         m = rt_msg1(RTM_IFINFO, &info);
1150         if (m == NULL)
1151                 return;
1152         ifm = mtod(m, struct if_msghdr *);
1153         ifm->ifm_index = ifp->if_index;
1154         ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
1155         ifm->ifm_data = ifp->if_data;
1156         ifm->ifm_addrs = 0;
1157         rt_dispatch(m, NULL);
1158 }
1159
1160 /*
1161  * This is called to generate messages from the routing socket
1162  * indicating a network interface has had addresses associated with it.
1163  * if we ever reverse the logic and replace messages TO the routing
1164  * socket indicate a request to configure interfaces, then it will
1165  * be unnecessary as the routing socket will automatically generate
1166  * copies of it.
1167  */
1168 void
1169 rt_newaddrmsg(int cmd, struct ifaddr *ifa, int error, struct rtentry *rt)
1170 {
1171         struct rt_addrinfo info;
1172         struct sockaddr *sa = NULL;
1173         int pass;
1174         struct mbuf *m = NULL;
1175         struct ifnet *ifp = ifa->ifa_ifp;
1176
1177         KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE,
1178                 ("unexpected cmd %u", cmd));
1179 #if defined(INET) || defined(INET6)
1180 #ifdef SCTP
1181         /*
1182          * notify the SCTP stack
1183          * this will only get called when an address is added/deleted
1184          * XXX pass the ifaddr struct instead if ifa->ifa_addr...
1185          */
1186         sctp_addr_change(ifa, cmd);
1187 #endif /* SCTP */
1188 #endif
1189         if (route_cb.any_count == 0)
1190                 return;
1191         for (pass = 1; pass < 3; pass++) {
1192                 bzero((caddr_t)&info, sizeof(info));
1193                 if ((cmd == RTM_ADD && pass == 1) ||
1194                     (cmd == RTM_DELETE && pass == 2)) {
1195                         struct ifa_msghdr *ifam;
1196                         int ncmd = cmd == RTM_ADD ? RTM_NEWADDR : RTM_DELADDR;
1197
1198                         info.rti_info[RTAX_IFA] = sa = ifa->ifa_addr;
1199                         info.rti_info[RTAX_IFP] = ifp->if_addr->ifa_addr;
1200                         info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask;
1201                         info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr;
1202                         if ((m = rt_msg1(ncmd, &info)) == NULL)
1203                                 continue;
1204                         ifam = mtod(m, struct ifa_msghdr *);
1205                         ifam->ifam_index = ifp->if_index;
1206                         ifam->ifam_metric = ifa->ifa_metric;
1207                         ifam->ifam_flags = ifa->ifa_flags;
1208                         ifam->ifam_addrs = info.rti_addrs;
1209                 }
1210                 if ((cmd == RTM_ADD && pass == 2) ||
1211                     (cmd == RTM_DELETE && pass == 1)) {
1212                         struct rt_msghdr *rtm;
1213
1214                         if (rt == NULL)
1215                                 continue;
1216                         info.rti_info[RTAX_NETMASK] = rt_mask(rt);
1217                         info.rti_info[RTAX_DST] = sa = rt_key(rt);
1218                         info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
1219                         if ((m = rt_msg1(cmd, &info)) == NULL)
1220                                 continue;
1221                         rtm = mtod(m, struct rt_msghdr *);
1222                         rtm->rtm_index = ifp->if_index;
1223                         rtm->rtm_flags |= rt->rt_flags;
1224                         rtm->rtm_errno = error;
1225                         rtm->rtm_addrs = info.rti_addrs;
1226                 }
1227                 rt_dispatch(m, sa);
1228         }
1229 }
1230
1231 /*
1232  * This is the analogue to the rt_newaddrmsg which performs the same
1233  * function but for multicast group memberhips.  This is easier since
1234  * there is no route state to worry about.
1235  */
1236 void
1237 rt_newmaddrmsg(int cmd, struct ifmultiaddr *ifma)
1238 {
1239         struct rt_addrinfo info;
1240         struct mbuf *m = NULL;
1241         struct ifnet *ifp = ifma->ifma_ifp;
1242         struct ifma_msghdr *ifmam;
1243
1244         if (route_cb.any_count == 0)
1245                 return;
1246
1247         bzero((caddr_t)&info, sizeof(info));
1248         info.rti_info[RTAX_IFA] = ifma->ifma_addr;
1249         info.rti_info[RTAX_IFP] = ifp ? ifp->if_addr->ifa_addr : NULL;
1250         /*
1251          * If a link-layer address is present, present it as a ``gateway''
1252          * (similarly to how ARP entries, e.g., are presented).
1253          */
1254         info.rti_info[RTAX_GATEWAY] = ifma->ifma_lladdr;
1255         m = rt_msg1(cmd, &info);
1256         if (m == NULL)
1257                 return;
1258         ifmam = mtod(m, struct ifma_msghdr *);
1259         KASSERT(ifp != NULL, ("%s: link-layer multicast address w/o ifp\n",
1260             __func__));
1261         ifmam->ifmam_index = ifp->if_index;
1262         ifmam->ifmam_addrs = info.rti_addrs;
1263         rt_dispatch(m, ifma->ifma_addr);
1264 }
1265
1266 static struct mbuf *
1267 rt_makeifannouncemsg(struct ifnet *ifp, int type, int what,
1268         struct rt_addrinfo *info)
1269 {
1270         struct if_announcemsghdr *ifan;
1271         struct mbuf *m;
1272
1273         if (route_cb.any_count == 0)
1274                 return NULL;
1275         bzero((caddr_t)info, sizeof(*info));
1276         m = rt_msg1(type, info);
1277         if (m != NULL) {
1278                 ifan = mtod(m, struct if_announcemsghdr *);
1279                 ifan->ifan_index = ifp->if_index;
1280                 strlcpy(ifan->ifan_name, ifp->if_xname,
1281                         sizeof(ifan->ifan_name));
1282                 ifan->ifan_what = what;
1283         }
1284         return m;
1285 }
1286
1287 /*
1288  * This is called to generate routing socket messages indicating
1289  * IEEE80211 wireless events.
1290  * XXX we piggyback on the RTM_IFANNOUNCE msg format in a clumsy way.
1291  */
1292 void
1293 rt_ieee80211msg(struct ifnet *ifp, int what, void *data, size_t data_len)
1294 {
1295         struct mbuf *m;
1296         struct rt_addrinfo info;
1297
1298         m = rt_makeifannouncemsg(ifp, RTM_IEEE80211, what, &info);
1299         if (m != NULL) {
1300                 /*
1301                  * Append the ieee80211 data.  Try to stick it in the
1302                  * mbuf containing the ifannounce msg; otherwise allocate
1303                  * a new mbuf and append.
1304                  *
1305                  * NB: we assume m is a single mbuf.
1306                  */
1307                 if (data_len > M_TRAILINGSPACE(m)) {
1308                         struct mbuf *n = m_get(M_NOWAIT, MT_DATA);
1309                         if (n == NULL) {
1310                                 m_freem(m);
1311                                 return;
1312                         }
1313                         bcopy(data, mtod(n, void *), data_len);
1314                         n->m_len = data_len;
1315                         m->m_next = n;
1316                 } else if (data_len > 0) {
1317                         bcopy(data, mtod(m, u_int8_t *) + m->m_len, data_len);
1318                         m->m_len += data_len;
1319                 }
1320                 if (m->m_flags & M_PKTHDR)
1321                         m->m_pkthdr.len += data_len;
1322                 mtod(m, struct if_announcemsghdr *)->ifan_msglen += data_len;
1323                 rt_dispatch(m, NULL);
1324         }
1325 }
1326
1327 /*
1328  * This is called to generate routing socket messages indicating
1329  * network interface arrival and departure.
1330  */
1331 void
1332 rt_ifannouncemsg(struct ifnet *ifp, int what)
1333 {
1334         struct mbuf *m;
1335         struct rt_addrinfo info;
1336
1337         m = rt_makeifannouncemsg(ifp, RTM_IFANNOUNCE, what, &info);
1338         if (m != NULL)
1339                 rt_dispatch(m, NULL);
1340 }
1341
1342 static void
1343 rt_dispatch(struct mbuf *m, const struct sockaddr *sa)
1344 {
1345         struct m_tag *tag;
1346
1347         /*
1348          * Preserve the family from the sockaddr, if any, in an m_tag for
1349          * use when injecting the mbuf into the routing socket buffer from
1350          * the netisr.
1351          */
1352         if (sa != NULL) {
1353                 tag = m_tag_get(PACKET_TAG_RTSOCKFAM, sizeof(unsigned short),
1354                     M_NOWAIT);
1355                 if (tag == NULL) {
1356                         m_freem(m);
1357                         return;
1358                 }
1359                 *(unsigned short *)(tag + 1) = sa->sa_family;
1360                 m_tag_prepend(m, tag);
1361         }
1362 #ifdef VIMAGE
1363         if (V_loif)
1364                 m->m_pkthdr.rcvif = V_loif;
1365         else {
1366                 m_freem(m);
1367                 return;
1368         }
1369 #endif
1370         netisr_queue(NETISR_ROUTE, m);  /* mbuf is free'd on failure. */
1371 }
1372
1373 /*
1374  * This is used in dumping the kernel table via sysctl().
1375  */
1376 static int
1377 sysctl_dumpentry(struct radix_node *rn, void *vw)
1378 {
1379         struct walkarg *w = vw;
1380         struct rtentry *rt = (struct rtentry *)rn;
1381         int error = 0, size;
1382         struct rt_addrinfo info;
1383
1384         if (w->w_op == NET_RT_FLAGS && !(rt->rt_flags & w->w_arg))
1385                 return 0;
1386         if ((rt->rt_flags & RTF_HOST) == 0
1387             ? jailed_without_vnet(w->w_req->td->td_ucred)
1388             : prison_if(w->w_req->td->td_ucred, rt_key(rt)) != 0)
1389                 return (0);
1390         bzero((caddr_t)&info, sizeof(info));
1391         info.rti_info[RTAX_DST] = rt_key(rt);
1392         info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
1393         info.rti_info[RTAX_NETMASK] = rt_mask(rt);
1394         info.rti_info[RTAX_GENMASK] = 0;
1395         if (rt->rt_ifp) {
1396                 info.rti_info[RTAX_IFP] = rt->rt_ifp->if_addr->ifa_addr;
1397                 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
1398                 if (rt->rt_ifp->if_flags & IFF_POINTOPOINT)
1399                         info.rti_info[RTAX_BRD] = rt->rt_ifa->ifa_dstaddr;
1400         }
1401         size = rt_msg2(RTM_GET, &info, NULL, w);
1402         if (w->w_req && w->w_tmem) {
1403                 struct rt_msghdr *rtm = (struct rt_msghdr *)w->w_tmem;
1404
1405                 rtm->rtm_flags = rt->rt_flags;
1406                 /*
1407                  * let's be honest about this being a retarded hack
1408                  */
1409                 rtm->rtm_fmask = rt->rt_rmx.rmx_pksent;
1410                 rt_getmetrics(&rt->rt_rmx, &rtm->rtm_rmx);
1411                 rtm->rtm_index = rt->rt_ifp->if_index;
1412                 rtm->rtm_errno = rtm->rtm_pid = rtm->rtm_seq = 0;
1413                 rtm->rtm_addrs = info.rti_addrs;
1414                 error = SYSCTL_OUT(w->w_req, (caddr_t)rtm, size);
1415                 return (error);
1416         }
1417         return (error);
1418 }
1419
1420 #ifdef COMPAT_FREEBSD32
1421 static void
1422 copy_ifdata32(struct if_data *src, struct if_data32 *dst)
1423 {
1424
1425         bzero(dst, sizeof(*dst));
1426         CP(*src, *dst, ifi_type);
1427         CP(*src, *dst, ifi_physical);
1428         CP(*src, *dst, ifi_addrlen);
1429         CP(*src, *dst, ifi_hdrlen);
1430         CP(*src, *dst, ifi_link_state);
1431         CP(*src, *dst, ifi_datalen);
1432         CP(*src, *dst, ifi_mtu);
1433         CP(*src, *dst, ifi_metric);
1434         CP(*src, *dst, ifi_baudrate);
1435         CP(*src, *dst, ifi_ipackets);
1436         CP(*src, *dst, ifi_ierrors);
1437         CP(*src, *dst, ifi_opackets);
1438         CP(*src, *dst, ifi_oerrors);
1439         CP(*src, *dst, ifi_collisions);
1440         CP(*src, *dst, ifi_ibytes);
1441         CP(*src, *dst, ifi_obytes);
1442         CP(*src, *dst, ifi_imcasts);
1443         CP(*src, *dst, ifi_omcasts);
1444         CP(*src, *dst, ifi_iqdrops);
1445         CP(*src, *dst, ifi_noproto);
1446         CP(*src, *dst, ifi_hwassist);
1447         CP(*src, *dst, ifi_epoch);
1448         TV_CP(*src, *dst, ifi_lastchange);
1449 }
1450 #endif
1451
1452 static int
1453 sysctl_iflist(int af, struct walkarg *w)
1454 {
1455         struct ifnet *ifp;
1456         struct ifaddr *ifa;
1457         struct rt_addrinfo info;
1458         int len, error = 0;
1459
1460         bzero((caddr_t)&info, sizeof(info));
1461         IFNET_RLOCK();
1462         TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1463                 if (w->w_arg && w->w_arg != ifp->if_index)
1464                         continue;
1465                 ifa = ifp->if_addr;
1466                 info.rti_info[RTAX_IFP] = ifa->ifa_addr;
1467                 len = rt_msg2(RTM_IFINFO, &info, NULL, w);
1468                 info.rti_info[RTAX_IFP] = NULL;
1469                 if (w->w_req && w->w_tmem) {
1470                         struct if_msghdr *ifm;
1471
1472 #ifdef COMPAT_FREEBSD32
1473                         if (w->w_req->flags & SCTL_MASK32) {
1474                                 struct if_msghdr32 *ifm32;
1475
1476                                 ifm32 = (struct if_msghdr32 *)w->w_tmem;
1477                                 ifm32->ifm_index = ifp->if_index;
1478                                 ifm32->ifm_flags = ifp->if_flags |
1479                                     ifp->if_drv_flags;
1480                                 copy_ifdata32(&ifp->if_data, &ifm32->ifm_data);
1481                                 ifm32->ifm_addrs = info.rti_addrs;
1482                                 error = SYSCTL_OUT(w->w_req, (caddr_t)ifm32,
1483                                     len);
1484                                 goto sysctl_out;
1485                         }
1486 #endif
1487                         ifm = (struct if_msghdr *)w->w_tmem;
1488                         ifm->ifm_index = ifp->if_index;
1489                         ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
1490                         ifm->ifm_data = ifp->if_data;
1491                         ifm->ifm_addrs = info.rti_addrs;
1492                         error = SYSCTL_OUT(w->w_req, (caddr_t)ifm, len);
1493 #ifdef COMPAT_FREEBSD32
1494                 sysctl_out:
1495 #endif
1496                         if (error)
1497                                 goto done;
1498                 }
1499                 while ((ifa = TAILQ_NEXT(ifa, ifa_link)) != NULL) {
1500                         if (af && af != ifa->ifa_addr->sa_family)
1501                                 continue;
1502                         if (prison_if(w->w_req->td->td_ucred,
1503                             ifa->ifa_addr) != 0)
1504                                 continue;
1505                         info.rti_info[RTAX_IFA] = ifa->ifa_addr;
1506                         info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask;
1507                         info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr;
1508                         len = rt_msg2(RTM_NEWADDR, &info, NULL, w);
1509                         if (w->w_req && w->w_tmem) {
1510                                 struct ifa_msghdr *ifam;
1511
1512                                 ifam = (struct ifa_msghdr *)w->w_tmem;
1513                                 ifam->ifam_index = ifa->ifa_ifp->if_index;
1514                                 ifam->ifam_flags = ifa->ifa_flags;
1515                                 ifam->ifam_metric = ifa->ifa_metric;
1516                                 ifam->ifam_addrs = info.rti_addrs;
1517                                 error = SYSCTL_OUT(w->w_req, w->w_tmem, len);
1518                                 if (error)
1519                                         goto done;
1520                         }
1521                 }
1522                 info.rti_info[RTAX_IFA] = info.rti_info[RTAX_NETMASK] =
1523                         info.rti_info[RTAX_BRD] = NULL;
1524         }
1525 done:
1526         IFNET_RUNLOCK();
1527         return (error);
1528 }
1529
1530 static int
1531 sysctl_ifmalist(int af, struct walkarg *w)
1532 {
1533         struct ifnet *ifp;
1534         struct ifmultiaddr *ifma;
1535         struct  rt_addrinfo info;
1536         int     len, error = 0;
1537         struct ifaddr *ifa;
1538
1539         bzero((caddr_t)&info, sizeof(info));
1540         IFNET_RLOCK();
1541         TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1542                 if (w->w_arg && w->w_arg != ifp->if_index)
1543                         continue;
1544                 ifa = ifp->if_addr;
1545                 info.rti_info[RTAX_IFP] = ifa ? ifa->ifa_addr : NULL;
1546                 IF_ADDR_LOCK(ifp);
1547                 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1548                         if (af && af != ifma->ifma_addr->sa_family)
1549                                 continue;
1550                         if (prison_if(w->w_req->td->td_ucred,
1551                             ifma->ifma_addr) != 0)
1552                                 continue;
1553                         info.rti_info[RTAX_IFA] = ifma->ifma_addr;
1554                         info.rti_info[RTAX_GATEWAY] =
1555                             (ifma->ifma_addr->sa_family != AF_LINK) ?
1556                             ifma->ifma_lladdr : NULL;
1557                         len = rt_msg2(RTM_NEWMADDR, &info, NULL, w);
1558                         if (w->w_req && w->w_tmem) {
1559                                 struct ifma_msghdr *ifmam;
1560
1561                                 ifmam = (struct ifma_msghdr *)w->w_tmem;
1562                                 ifmam->ifmam_index = ifma->ifma_ifp->if_index;
1563                                 ifmam->ifmam_flags = 0;
1564                                 ifmam->ifmam_addrs = info.rti_addrs;
1565                                 error = SYSCTL_OUT(w->w_req, w->w_tmem, len);
1566                                 if (error) {
1567                                         IF_ADDR_UNLOCK(ifp);
1568                                         goto done;
1569                                 }
1570                         }
1571                 }
1572                 IF_ADDR_UNLOCK(ifp);
1573         }
1574 done:
1575         IFNET_RUNLOCK();
1576         return (error);
1577 }
1578
1579 static int
1580 sysctl_rtsock(SYSCTL_HANDLER_ARGS)
1581 {
1582         int     *name = (int *)arg1;
1583         u_int   namelen = arg2;
1584         struct radix_node_head *rnh = NULL; /* silence compiler. */
1585         int     i, lim, error = EINVAL;
1586         u_char  af;
1587         struct  walkarg w;
1588
1589         name ++;
1590         namelen--;
1591         if (req->newptr)
1592                 return (EPERM);
1593         if (namelen != 3)
1594                 return ((namelen < 3) ? EISDIR : ENOTDIR);
1595         af = name[0];
1596         if (af > AF_MAX)
1597                 return (EINVAL);
1598         bzero(&w, sizeof(w));
1599         w.w_op = name[1];
1600         w.w_arg = name[2];
1601         w.w_req = req;
1602
1603         error = sysctl_wire_old_buffer(req, 0);
1604         if (error)
1605                 return (error);
1606         switch (w.w_op) {
1607
1608         case NET_RT_DUMP:
1609         case NET_RT_FLAGS:
1610                 if (af == 0) {                  /* dump all tables */
1611                         i = 1;
1612                         lim = AF_MAX;
1613                 } else                          /* dump only one table */
1614                         i = lim = af;
1615
1616                 /*
1617                  * take care of llinfo entries, the caller must
1618                  * specify an AF
1619                  */
1620                 if (w.w_op == NET_RT_FLAGS &&
1621                     (w.w_arg == 0 || w.w_arg & RTF_LLINFO)) {
1622                         if (af != 0)
1623                                 error = lltable_sysctl_dumparp(af, w.w_req);
1624                         else
1625                                 error = EINVAL;
1626                         break;
1627                 }
1628                 /*
1629                  * take care of routing entries
1630                  */
1631                 for (error = 0; error == 0 && i <= lim; i++) {
1632                         rnh = rt_tables_get_rnh(req->td->td_proc->p_fibnum, i);
1633                         if (rnh != NULL) {
1634                                 RADIX_NODE_HEAD_LOCK(rnh);
1635                                 error = rnh->rnh_walktree(rnh,
1636                                     sysctl_dumpentry, &w);
1637                                 RADIX_NODE_HEAD_UNLOCK(rnh);
1638                         } else if (af != 0)
1639                                 error = EAFNOSUPPORT;
1640                 }
1641                 break;
1642
1643         case NET_RT_IFLIST:
1644                 error = sysctl_iflist(af, &w);
1645                 break;
1646
1647         case NET_RT_IFMALIST:
1648                 error = sysctl_ifmalist(af, &w);
1649                 break;
1650         }
1651         if (w.w_tmem)
1652                 free(w.w_tmem, M_RTABLE);
1653         return (error);
1654 }
1655
1656 SYSCTL_NODE(_net, PF_ROUTE, routetable, CTLFLAG_RD, sysctl_rtsock, "");
1657
1658 /*
1659  * Definitions of protocols supported in the ROUTE domain.
1660  */
1661
1662 static struct domain routedomain;               /* or at least forward */
1663
1664 static struct protosw routesw[] = {
1665 {
1666         .pr_type =              SOCK_RAW,
1667         .pr_domain =            &routedomain,
1668         .pr_flags =             PR_ATOMIC|PR_ADDR,
1669         .pr_output =            route_output,
1670         .pr_ctlinput =          raw_ctlinput,
1671         .pr_init =              raw_init,
1672         .pr_usrreqs =           &route_usrreqs
1673 }
1674 };
1675
1676 static struct domain routedomain = {
1677         .dom_family =           PF_ROUTE,
1678         .dom_name =              "route",
1679         .dom_protosw =          routesw,
1680         .dom_protoswNPROTOSW =  &routesw[sizeof(routesw)/sizeof(routesw[0])]
1681 };
1682
1683 VNET_DOMAIN_SET(route);