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/if_types.h>
  59 #include <net/netisr.h>
  60 #include <net/raw_cb.h>
  61 #include <net/route.h>
  62 #include <net/vnet.h>
  63
  64 #include <netinet/in.h>
  65 #include <netinet/if_ether.h>
  66 #ifdef INET6
  67 #include <netinet6/scope6_var.h>
  68 #endif
  69
  70 #if defined(INET) || defined(INET6)
  71 #ifdef SCTP
  72 extern void sctp_addr_change(struct ifaddr *ifa, int cmd);
  73 #endif /* SCTP */
  74 #endif
  75
  76 #ifdef COMPAT_FREEBSD32
  77 #include <sys/mount.h>
  78 #include <compat/freebsd32/freebsd32.h>
  79
  80 struct if_data32 {
  81         uint8_t ifi_type;
  82         uint8_t ifi_physical;
  83         uint8_t ifi_addrlen;
  84         uint8_t ifi_hdrlen;
  85         uint8_t ifi_link_state;
  86         uint8_t ifi_spare_char1;
  87         uint8_t ifi_spare_char2;
  88         uint8_t ifi_datalen;
  89         uint32_t ifi_mtu;
  90         uint32_t ifi_metric;
  91         uint32_t ifi_baudrate;
  92         uint32_t ifi_ipackets;
  93         uint32_t ifi_ierrors;
  94         uint32_t ifi_opackets;
  95         uint32_t ifi_oerrors;
  96         uint32_t ifi_collisions;
  97         uint32_t ifi_ibytes;
  98         uint32_t ifi_obytes;
  99         uint32_t ifi_imcasts;
 100         uint32_t ifi_omcasts;
 101         uint32_t ifi_iqdrops;
 102         uint32_t ifi_noproto;
 103         uint32_t ifi_hwassist;
 104         int32_t ifi_epoch;
 105         struct  timeval32 ifi_lastchange;
 106 };
 107
 108 struct if_msghdr32 {
 109         uint16_t ifm_msglen;
 110         uint8_t ifm_version;
 111         uint8_t ifm_type;
 112         int32_t ifm_addrs;
 113         int32_t ifm_flags;
 114         uint16_t ifm_index;
 115         struct  if_data32 ifm_data;
 116 };
 117 #endif
 118
 119 MALLOC_DEFINE(M_RTABLE, "routetbl", "routing tables");
 120
 121 /* NB: these are not modified */
 122 static struct   sockaddr route_src = { 2, PF_ROUTE, };
 123 static struct   sockaddr sa_zero   = { sizeof(sa_zero), AF_INET, };
 124
 125 static struct {
 126         int     ip_count;       /* attached w/ AF_INET */
 127         int     ip6_count;      /* attached w/ AF_INET6 */
 128         int     ipx_count;      /* attached w/ AF_IPX */
 129         int     any_count;      /* total attached */
 130 } route_cb;
 131
 132 struct mtx rtsock_mtx;
 133 MTX_SYSINIT(rtsock, &rtsock_mtx, "rtsock route_cb lock", MTX_DEF);
 134
 135 #define RTSOCK_LOCK()   mtx_lock(&rtsock_mtx)
 136 #define RTSOCK_UNLOCK() mtx_unlock(&rtsock_mtx)
 137 #define RTSOCK_LOCK_ASSERT()    mtx_assert(&rtsock_mtx, MA_OWNED)
 138
 139 SYSCTL_NODE(_net, OID_AUTO, route, CTLFLAG_RD, 0, "");
 140
 141 struct walkarg {
 142         int     w_tmemsize;
 143         int     w_op, w_arg;
 144         caddr_t w_tmem;
 145         struct sysctl_req *w_req;
 146 };
 147
 148 static void     rts_input(struct mbuf *m);
 149 static struct mbuf *rt_msg1(int type, struct rt_addrinfo *rtinfo);
 150 static int      rt_msg2(int type, struct rt_addrinfo *rtinfo,
 151                         caddr_t cp, struct walkarg *w);
 152 static int      rt_xaddrs(caddr_t cp, caddr_t cplim,
 153                         struct rt_addrinfo *rtinfo);
 154 static int      sysctl_dumpentry(struct radix_node *rn, void *vw);
 155 static int      sysctl_iflist(int af, struct walkarg *w);
 156 static int      sysctl_ifmalist(int af, struct walkarg *w);
 157 static int      route_output(struct mbuf *m, struct socket *so);
 158 static void     rt_setmetrics(u_long which, const struct rt_metrics *in,
 159                         struct rt_metrics_lite *out);
 160 static void     rt_getmetrics(const struct rt_metrics_lite *in,
 161                         struct rt_metrics *out);
 162 static void     rt_dispatch(struct mbuf *, const struct sockaddr *);
 163
 164 static struct netisr_handler rtsock_nh = {
 165         .nh_name = "rtsock",
 166         .nh_handler = rts_input,
 167         .nh_proto = NETISR_ROUTE,
 168         .nh_policy = NETISR_POLICY_SOURCE,
 169 };
 170
 171 static int
 172 sysctl_route_netisr_maxqlen(SYSCTL_HANDLER_ARGS)
 173 {
 174         int error, qlimit;
 175
 176         netisr_getqlimit(&rtsock_nh, &qlimit);
 177         error = sysctl_handle_int(oidp, &qlimit, 0, req);
 178         if (error || !req->newptr)
 179                 return (error);
 180         if (qlimit < 1)
 181                 return (EINVAL);
 182         return (netisr_setqlimit(&rtsock_nh, qlimit));
 183 }
 184 SYSCTL_PROC(_net_route, OID_AUTO, netisr_maxqlen, CTLTYPE_INT|CTLFLAG_RW,
 185     0, 0, sysctl_route_netisr_maxqlen, "I",
 186     "maximum routing socket dispatch queue length");
 187
 188 static void
 189 rts_init(void)
 190 {
 191         int tmp;
 192
 193         if (TUNABLE_INT_FETCH("net.route.netisr_maxqlen", &tmp))
 194                 rtsock_nh.nh_qlimit = tmp;
 195         netisr_register(&rtsock_nh);
 196 }
 197 SYSINIT(rtsock, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, rts_init, 0);
 198
 199 static void
 200 rts_input(struct mbuf *m)
 201 {
 202         struct sockproto route_proto;
 203         unsigned short *family;
 204         struct m_tag *tag;
 205
 206         route_proto.sp_family = PF_ROUTE;
 207         tag = m_tag_find(m, PACKET_TAG_RTSOCKFAM, NULL);
 208         if (tag != NULL) {
 209                 family = (unsigned short *)(tag + 1);
 210                 route_proto.sp_protocol = *family;
 211                 m_tag_delete(m, tag);
 212         } else
 213                 route_proto.sp_protocol = 0;
 214
 215         raw_input(m, &route_proto, &route_src);
 216 }
 217
 218 /*
 219  * It really doesn't make any sense at all for this code to share much
 220  * with raw_usrreq.c, since its functionality is so restricted.  XXX
 221  */
 222 static void
 223 rts_abort(struct socket *so)
 224 {
 225
 226         raw_usrreqs.pru_abort(so);
 227 }
 228
 229 static void
 230 rts_close(struct socket *so)
 231 {
 232
 233         raw_usrreqs.pru_close(so);
 234 }
 235
 236 /* pru_accept is EOPNOTSUPP */
 237
 238 static int
 239 rts_attach(struct socket *so, int proto, struct thread *td)
 240 {
 241         struct rawcb *rp;
 242         int s, error;
 243
 244         KASSERT(so->so_pcb == NULL, ("rts_attach: so_pcb != NULL"));
 245
 246         /* XXX */
 247         rp = malloc(sizeof *rp, M_PCB, M_WAITOK | M_ZERO);
 248         if (rp == NULL)
 249                 return ENOBUFS;
 250
 251         /*
 252          * The splnet() is necessary to block protocols from sending
 253          * error notifications (like RTM_REDIRECT or RTM_LOSING) while
 254          * this PCB is extant but incompletely initialized.
 255          * Probably we should try to do more of this work beforehand and
 256          * eliminate the spl.
 257          */
 258         s = splnet();
 259         so->so_pcb = (caddr_t)rp;
 260         so->so_fibnum = td->td_proc->p_fibnum;
 261         error = raw_attach(so, proto);
 262         rp = sotorawcb(so);
 263         if (error) {
 264                 splx(s);
 265                 so->so_pcb = NULL;
 266                 free(rp, M_PCB);
 267                 return error;
 268         }
 269         RTSOCK_LOCK();
 270         switch(rp->rcb_proto.sp_protocol) {
 271         case AF_INET:
 272                 route_cb.ip_count++;
 273                 break;
 274         case AF_INET6:
 275                 route_cb.ip6_count++;
 276                 break;
 277         case AF_IPX:
 278                 route_cb.ipx_count++;
 279                 break;
 280         }
 281         route_cb.any_count++;
 282         RTSOCK_UNLOCK();
 283         soisconnected(so);
 284         so->so_options |= SO_USELOOPBACK;
 285         splx(s);
 286         return 0;
 287 }
 288
 289 static int
 290 rts_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 291 {
 292
 293         return (raw_usrreqs.pru_bind(so, nam, td)); /* xxx just EINVAL */
 294 }
 295
 296 static int
 297 rts_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 298 {
 299
 300         return (raw_usrreqs.pru_connect(so, nam, td)); /* XXX just EINVAL */
 301 }
 302
 303 /* pru_connect2 is EOPNOTSUPP */
 304 /* pru_control is EOPNOTSUPP */
 305
 306 static void
 307 rts_detach(struct socket *so)
 308 {
 309         struct rawcb *rp = sotorawcb(so);
 310
 311         KASSERT(rp != NULL, ("rts_detach: rp == NULL"));
 312
 313         RTSOCK_LOCK();
 314         switch(rp->rcb_proto.sp_protocol) {
 315         case AF_INET:
 316                 route_cb.ip_count--;
 317                 break;
 318         case AF_INET6:
 319                 route_cb.ip6_count--;
 320                 break;
 321         case AF_IPX:
 322                 route_cb.ipx_count--;
 323                 break;
 324         }
 325         route_cb.any_count--;
 326         RTSOCK_UNLOCK();
 327         raw_usrreqs.pru_detach(so);
 328 }
 329
 330 static int
 331 rts_disconnect(struct socket *so)
 332 {
 333
 334         return (raw_usrreqs.pru_disconnect(so));
 335 }
 336
 337 /* pru_listen is EOPNOTSUPP */
 338
 339 static int
 340 rts_peeraddr(struct socket *so, struct sockaddr **nam)
 341 {
 342
 343         return (raw_usrreqs.pru_peeraddr(so, nam));
 344 }
 345
 346 /* pru_rcvd is EOPNOTSUPP */
 347 /* pru_rcvoob is EOPNOTSUPP */
 348
 349 static int
 350 rts_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
 351          struct mbuf *control, struct thread *td)
 352 {
 353
 354         return (raw_usrreqs.pru_send(so, flags, m, nam, control, td));
 355 }
 356
 357 /* pru_sense is null */
 358
 359 static int
 360 rts_shutdown(struct socket *so)
 361 {
 362
 363         return (raw_usrreqs.pru_shutdown(so));
 364 }
 365
 366 static int
 367 rts_sockaddr(struct socket *so, struct sockaddr **nam)
 368 {
 369
 370         return (raw_usrreqs.pru_sockaddr(so, nam));
 371 }
 372
 373 static struct pr_usrreqs route_usrreqs = {
 374         .pru_abort =            rts_abort,
 375         .pru_attach =           rts_attach,
 376         .pru_bind =             rts_bind,
 377         .pru_connect =          rts_connect,
 378         .pru_detach =           rts_detach,
 379         .pru_disconnect =       rts_disconnect,
 380         .pru_peeraddr =         rts_peeraddr,
 381         .pru_send =             rts_send,
 382         .pru_shutdown =         rts_shutdown,
 383         .pru_sockaddr =         rts_sockaddr,
 384         .pru_close =            rts_close,
 385 };
 386
 387 #ifndef _SOCKADDR_UNION_DEFINED
 388 #define _SOCKADDR_UNION_DEFINED
 389 /*
 390  * The union of all possible address formats we handle.
 391  */
 392 union sockaddr_union {
 393         struct sockaddr         sa;
 394         struct sockaddr_in      sin;
 395         struct sockaddr_in6     sin6;
 396 };
 397 #endif /* _SOCKADDR_UNION_DEFINED */
 398
 399 static int
 400 rtm_get_jailed(struct rt_addrinfo *info, struct ifnet *ifp,
 401     struct rtentry *rt, union sockaddr_union *saun, struct ucred *cred)
 402 {
 403
 404         /* First, see if the returned address is part of the jail. */
 405         if (prison_if(cred, rt->rt_ifa->ifa_addr) == 0) {
 406                 info->rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
 407                 return (0);
 408         }
 409
 410         switch (info->rti_info[RTAX_DST]->sa_family) {
 411 #ifdef INET
 412         case AF_INET:
 413         {
 414                 struct in_addr ia;
 415                 struct ifaddr *ifa;
 416                 int found;
 417
 418                 found = 0;
 419                 /*
 420                  * Try to find an address on the given outgoing interface
 421                  * that belongs to the jail.
 422                  */
 423                 IF_ADDR_LOCK(ifp);
 424                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 425                         struct sockaddr *sa;
 426                         sa = ifa->ifa_addr;
 427                         if (sa->sa_family != AF_INET)
 428                                 continue;
 429                         ia = ((struct sockaddr_in *)sa)->sin_addr;
 430                         if (prison_check_ip4(cred, &ia) == 0) {
 431                                 found = 1;
 432                                 break;
 433                         }
 434                 }
 435                 IF_ADDR_UNLOCK(ifp);
 436                 if (!found) {
 437                         /*
 438                          * As a last resort return the 'default' jail address.
 439                          */
 440                         ia = ((struct sockaddr_in *)rt->rt_ifa->ifa_addr)->
 441                             sin_addr;
 442                         if (prison_get_ip4(cred, &ia) != 0)
 443                                 return (ESRCH);
 444                 }
 445                 bzero(&saun->sin, sizeof(struct sockaddr_in));
 446                 saun->sin.sin_len = sizeof(struct sockaddr_in);
 447                 saun->sin.sin_family = AF_INET;
 448                 saun->sin.sin_addr.s_addr = ia.s_addr;
 449                 info->rti_info[RTAX_IFA] = (struct sockaddr *)&saun->sin;
 450                 break;
 451         }
 452 #endif
 453 #ifdef INET6
 454         case AF_INET6:
 455         {
 456                 struct in6_addr ia6;
 457                 struct ifaddr *ifa;
 458                 int found;
 459
 460                 found = 0;
 461                 /*
 462                  * Try to find an address on the given outgoing interface
 463                  * that belongs to the jail.
 464                  */
 465                 IF_ADDR_LOCK(ifp);
 466                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 467                         struct sockaddr *sa;
 468                         sa = ifa->ifa_addr;
 469                         if (sa->sa_family != AF_INET6)
 470                                 continue;
 471                         bcopy(&((struct sockaddr_in6 *)sa)->sin6_addr,
 472                             &ia6, sizeof(struct in6_addr));
 473                         if (prison_check_ip6(cred, &ia6) == 0) {
 474                                 found = 1;
 475                                 break;
 476                         }
 477                 }
 478                 IF_ADDR_UNLOCK(ifp);
 479                 if (!found) {
 480                         /*
 481                          * As a last resort return the 'default' jail address.
 482                          */
 483                         ia6 = ((struct sockaddr_in6 *)rt->rt_ifa->ifa_addr)->
 484                             sin6_addr;
 485                         if (prison_get_ip6(cred, &ia6) != 0)
 486                                 return (ESRCH);
 487                 }
 488                 bzero(&saun->sin6, sizeof(struct sockaddr_in6));
 489                 saun->sin6.sin6_len = sizeof(struct sockaddr_in6);
 490                 saun->sin6.sin6_family = AF_INET6;
 491                 bcopy(&ia6, &saun->sin6.sin6_addr, sizeof(struct in6_addr));
 492                 if (sa6_recoverscope(&saun->sin6) != 0)
 493                         return (ESRCH);
 494                 info->rti_info[RTAX_IFA] = (struct sockaddr *)&saun->sin6;
 495                 break;
 496         }
 497 #endif
 498         default:
 499                 return (ESRCH);
 500         }
 501         return (0);
 502 }
 503
 504 /*ARGSUSED*/
 505 static int
 506 route_output(struct mbuf *m, struct socket *so)
 507 {
 508 #define sa_equal(a1, a2) (bcmp((a1), (a2), (a1)->sa_len) == 0)
 509         struct rt_msghdr *rtm = NULL;
 510         struct rtentry *rt = NULL;
 511         struct radix_node_head *rnh;
 512         struct rt_addrinfo info;
 513         int len, error = 0;
 514         struct ifnet *ifp = NULL;
 515         union sockaddr_union saun;
 516
 517 #define senderr(e) { error = e; goto flush;}
 518         if (m == NULL || ((m->m_len < sizeof(long)) &&
 519                        (m = m_pullup(m, sizeof(long))) == NULL))
 520                 return (ENOBUFS);
 521         if ((m->m_flags & M_PKTHDR) == 0)
 522                 panic("route_output");
 523         len = m->m_pkthdr.len;
 524         if (len < sizeof(*rtm) ||
 525             len != mtod(m, struct rt_msghdr *)->rtm_msglen) {
 526                 info.rti_info[RTAX_DST] = NULL;
 527                 senderr(EINVAL);
 528         }
 529         R_Malloc(rtm, struct rt_msghdr *, len);
 530         if (rtm == NULL) {
 531                 info.rti_info[RTAX_DST] = NULL;
 532                 senderr(ENOBUFS);
 533         }
 534         m_copydata(m, 0, len, (caddr_t)rtm);
 535         if (rtm->rtm_version != RTM_VERSION) {
 536                 info.rti_info[RTAX_DST] = NULL;
 537                 senderr(EPROTONOSUPPORT);
 538         }
 539         rtm->rtm_pid = curproc->p_pid;
 540         bzero(&info, sizeof(info));
 541         info.rti_addrs = rtm->rtm_addrs;
 542         if (rt_xaddrs((caddr_t)(rtm + 1), len + (caddr_t)rtm, &info)) {
 543                 info.rti_info[RTAX_DST] = NULL;
 544                 senderr(EINVAL);
 545         }
 546         info.rti_flags = rtm->rtm_flags;
 547         if (info.rti_info[RTAX_DST] == NULL ||
 548             info.rti_info[RTAX_DST]->sa_family >= AF_MAX ||
 549             (info.rti_info[RTAX_GATEWAY] != NULL &&
 550              info.rti_info[RTAX_GATEWAY]->sa_family >= AF_MAX))
 551                 senderr(EINVAL);
 552         /*
 553          * Verify that the caller has the appropriate privilege; RTM_GET
 554          * is the only operation the non-superuser is allowed.
 555          */
 556         if (rtm->rtm_type != RTM_GET) {
 557                 error = priv_check(curthread, PRIV_NET_ROUTE);
 558                 if (error)
 559                         senderr(error);
 560         }
 561
 562         /*
 563          * The given gateway address may be an interface address.
 564          * For example, issuing a "route change" command on a route
 565          * entry that was created from a tunnel, and the gateway
 566          * address given is the local end point. In this case the
 567          * RTF_GATEWAY flag must be cleared or the destination will
 568          * not be reachable even though there is no error message.
 569          */
 570         if (info.rti_info[RTAX_GATEWAY] != NULL &&
 571             info.rti_info[RTAX_GATEWAY]->sa_family != AF_LINK) {
 572                 struct route gw_ro;
 573
 574                 bzero(&gw_ro, sizeof(gw_ro));
 575                 gw_ro.ro_dst = *info.rti_info[RTAX_GATEWAY];
 576                 rtalloc_ign_fib(&gw_ro, 0, so->so_fibnum);
 577                 /*
 578                  * A host route through the loopback interface is
 579                  * installed for each interface adddress. In pre 8.0
 580                  * releases the interface address of a PPP link type
 581                  * is not reachable locally. This behavior is fixed as
 582                  * part of the new L2/L3 redesign and rewrite work. The
 583                  * signature of this interface address route is the
 584                  * AF_LINK sa_family type of the rt_gateway, and the
 585                  * rt_ifp has the IFF_LOOPBACK flag set.
 586                  */
 587                 if (gw_ro.ro_rt != NULL &&
 588                     gw_ro.ro_rt->rt_gateway->sa_family == AF_LINK &&
 589                     gw_ro.ro_rt->rt_ifp->if_flags & IFF_LOOPBACK)
 590                         info.rti_flags &= ~RTF_GATEWAY;
 591                 if (gw_ro.ro_rt != NULL)
 592                         RTFREE(gw_ro.ro_rt);
 593         }
 594
 595         switch (rtm->rtm_type) {
 596                 struct rtentry *saved_nrt;
 597
 598         case RTM_ADD:
 599                 if (info.rti_info[RTAX_GATEWAY] == NULL)
 600                         senderr(EINVAL);
 601                 saved_nrt = NULL;
 602
 603                 /* support for new ARP code */
 604                 if (info.rti_info[RTAX_GATEWAY]->sa_family == AF_LINK &&
 605                     (rtm->rtm_flags & RTF_LLDATA) != 0) {
 606                         error = lla_rt_output(rtm, &info);
 607                         break;
 608                 }
 609                 error = rtrequest1_fib(RTM_ADD, &info, &saved_nrt,
 610                     so->so_fibnum);
 611                 if (error == 0 && saved_nrt) {
 612                         RT_LOCK(saved_nrt);
 613                         rt_setmetrics(rtm->rtm_inits,
 614                                 &rtm->rtm_rmx, &saved_nrt->rt_rmx);
 615                         rtm->rtm_index = saved_nrt->rt_ifp->if_index;
 616                         RT_REMREF(saved_nrt);
 617                         RT_UNLOCK(saved_nrt);
 618                 }
 619                 break;
 620
 621         case RTM_DELETE:
 622                 saved_nrt = NULL;
 623                 /* support for new ARP code */
 624                 if (info.rti_info[RTAX_GATEWAY] &&
 625                     (info.rti_info[RTAX_GATEWAY]->sa_family == AF_LINK) &&
 626                     (rtm->rtm_flags & RTF_LLDATA) != 0) {
 627                         error = lla_rt_output(rtm, &info);
 628                         break;
 629                 }
 630                 error = rtrequest1_fib(RTM_DELETE, &info, &saved_nrt,
 631                     so->so_fibnum);
 632                 if (error == 0) {
 633                         RT_LOCK(saved_nrt);
 634                         rt = saved_nrt;
 635                         goto report;
 636                 }
 637                 break;
 638
 639         case RTM_GET:
 640         case RTM_CHANGE:
 641         case RTM_LOCK:
 642                 rnh = rt_tables_get_rnh(so->so_fibnum,
 643                     info.rti_info[RTAX_DST]->sa_family);
 644                 if (rnh == NULL)
 645                         senderr(EAFNOSUPPORT);
 646                 RADIX_NODE_HEAD_RLOCK(rnh);
 647                 rt = (struct rtentry *) rnh->rnh_lookup(info.rti_info[RTAX_DST],
 648                         info.rti_info[RTAX_NETMASK], rnh);
 649                 if (rt == NULL) {       /* XXX looks bogus */
 650                         RADIX_NODE_HEAD_RUNLOCK(rnh);
 651                         senderr(ESRCH);
 652                 }
 653 #ifdef RADIX_MPATH
 654                 /*
 655                  * for RTM_CHANGE/LOCK, if we got multipath routes,
 656                  * we require users to specify a matching RTAX_GATEWAY.
 657                  *
 658                  * for RTM_GET, gate is optional even with multipath.
 659                  * if gate == NULL the first match is returned.
 660                  * (no need to call rt_mpath_matchgate if gate == NULL)
 661                  */
 662                 if (rn_mpath_capable(rnh) &&
 663                     (rtm->rtm_type != RTM_GET || info.rti_info[RTAX_GATEWAY])) {
 664                         rt = rt_mpath_matchgate(rt, info.rti_info[RTAX_GATEWAY]);
 665                         if (!rt) {
 666                                 RADIX_NODE_HEAD_RUNLOCK(rnh);
 667                                 senderr(ESRCH);
 668                         }
 669                 }
 670 #endif
 671                 /*
 672                  * If performing proxied L2 entry insertion, and
 673                  * the actual PPP host entry is found, perform
 674                  * another search to retrieve the prefix route of
 675                  * the local end point of the PPP link.
 676                  */
 677                 if (rtm->rtm_flags & RTF_ANNOUNCE) {
 678                         struct sockaddr laddr;
 679
 680                         if (rt->rt_ifp != NULL &&
 681                             rt->rt_ifp->if_type == IFT_PROPVIRTUAL) {
 682                                 struct ifaddr *ifa;
 683
 684                                 ifa = ifa_ifwithnet(info.rti_info[RTAX_DST], 1);
 685                                 if (ifa != NULL)
 686                                         rt_maskedcopy(ifa->ifa_addr,
 687                                                       &laddr,
 688                                                       ifa->ifa_netmask);
 689                         } else
 690                                 rt_maskedcopy(rt->rt_ifa->ifa_addr,
 691                                               &laddr,
 692                                               rt->rt_ifa->ifa_netmask);
 693                         /*
 694                          * refactor rt and no lock operation necessary
 695                          */
 696                         rt = (struct rtentry *)rnh->rnh_matchaddr(&laddr, rnh);
 697                         if (rt == NULL) {
 698                                 RADIX_NODE_HEAD_RUNLOCK(rnh);
 699                                 senderr(ESRCH);
 700                         }
 701                 }
 702                 RT_LOCK(rt);
 703                 RT_ADDREF(rt);
 704                 RADIX_NODE_HEAD_RUNLOCK(rnh);
 705
 706                 /*
 707                  * Fix for PR: 82974
 708                  *
 709                  * RTM_CHANGE/LOCK need a perfect match, rn_lookup()
 710                  * returns a perfect match in case a netmask is
 711                  * specified.  For host routes only a longest prefix
 712                  * match is returned so it is necessary to compare the
 713                  * existence of the netmask.  If both have a netmask
 714                  * rnh_lookup() did a perfect match and if none of them
 715                  * have a netmask both are host routes which is also a
 716                  * perfect match.
 717                  */
 718
 719                 if (rtm->rtm_type != RTM_GET &&
 720                     (!rt_mask(rt) != !info.rti_info[RTAX_NETMASK])) {
 721                         RT_UNLOCK(rt);
 722                         senderr(ESRCH);
 723                 }
 724
 725                 switch(rtm->rtm_type) {
 726
 727                 case RTM_GET:
 728                 report:
 729                         RT_LOCK_ASSERT(rt);
 730                         if ((rt->rt_flags & RTF_HOST) == 0
 731                             ? jailed_without_vnet(curthread->td_ucred)
 732                             : prison_if(curthread->td_ucred,
 733                             rt_key(rt)) != 0) {
 734                                 RT_UNLOCK(rt);
 735                                 senderr(ESRCH);
 736                         }
 737                         info.rti_info[RTAX_DST] = rt_key(rt);
 738                         info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
 739                         info.rti_info[RTAX_NETMASK] = rt_mask(rt);
 740                         info.rti_info[RTAX_GENMASK] = 0;
 741                         if (rtm->rtm_addrs & (RTA_IFP | RTA_IFA)) {
 742                                 ifp = rt->rt_ifp;
 743                                 if (ifp) {
 744                                         info.rti_info[RTAX_IFP] =
 745                                             ifp->if_addr->ifa_addr;
 746                                         error = rtm_get_jailed(&info, ifp, rt,
 747                                             &saun, curthread->td_ucred);
 748                                         if (error != 0) {
 749                                                 RT_UNLOCK(rt);
 750                                                 senderr(error);
 751                                         }
 752                                         if (ifp->if_flags & IFF_POINTOPOINT)
 753                                                 info.rti_info[RTAX_BRD] =
 754                                                     rt->rt_ifa->ifa_dstaddr;
 755                                         rtm->rtm_index = ifp->if_index;
 756                                 } else {
 757                                         info.rti_info[RTAX_IFP] = NULL;
 758                                         info.rti_info[RTAX_IFA] = NULL;
 759                                 }
 760                         } else if ((ifp = rt->rt_ifp) != NULL) {
 761                                 rtm->rtm_index = ifp->if_index;
 762                         }
 763                         len = rt_msg2(rtm->rtm_type, &info, NULL, NULL);
 764                         if (len > rtm->rtm_msglen) {
 765                                 struct rt_msghdr *new_rtm;
 766                                 R_Malloc(new_rtm, struct rt_msghdr *, len);
 767                                 if (new_rtm == NULL) {
 768                                         RT_UNLOCK(rt);
 769                                         senderr(ENOBUFS);
 770                                 }
 771                                 bcopy(rtm, new_rtm, rtm->rtm_msglen);
 772                                 Free(rtm); rtm = new_rtm;
 773                         }
 774                         (void)rt_msg2(rtm->rtm_type, &info, (caddr_t)rtm, NULL);
 775                         rtm->rtm_flags = rt->rt_flags;
 776                         rt_getmetrics(&rt->rt_rmx, &rtm->rtm_rmx);
 777                         rtm->rtm_addrs = info.rti_addrs;
 778                         break;
 779
 780                 case RTM_CHANGE:
 781                         /*
 782                          * New gateway could require new ifaddr, ifp;
 783                          * flags may also be different; ifp may be specified
 784                          * by ll sockaddr when protocol address is ambiguous
 785                          */
 786                         if (((rt->rt_flags & RTF_GATEWAY) &&
 787                              info.rti_info[RTAX_GATEWAY] != NULL) ||
 788                             info.rti_info[RTAX_IFP] != NULL ||
 789                             (info.rti_info[RTAX_IFA] != NULL &&
 790                              !sa_equal(info.rti_info[RTAX_IFA],
 791                                        rt->rt_ifa->ifa_addr))) {
 792                                 RT_UNLOCK(rt);
 793                                 RADIX_NODE_HEAD_LOCK(rnh);
 794                                 error = rt_getifa_fib(&info, rt->rt_fibnum);
 795                                 /*
 796                                  * XXXRW: Really we should release this
 797                                  * reference later, but this maintains
 798                                  * historical behavior.
 799                                  */
 800                                 if (info.rti_ifa != NULL)
 801                                         ifa_free(info.rti_ifa);
 802                                 RADIX_NODE_HEAD_UNLOCK(rnh);
 803                                 if (error != 0)
 804                                         senderr(error);
 805                                 RT_LOCK(rt);
 806                         }
 807                         if (info.rti_ifa != NULL &&
 808                             info.rti_ifa != rt->rt_ifa &&
 809                             rt->rt_ifa != NULL &&
 810                             rt->rt_ifa->ifa_rtrequest != NULL) {
 811                                 rt->rt_ifa->ifa_rtrequest(RTM_DELETE, rt,
 812                                     &info);
 813                                 ifa_free(rt->rt_ifa);
 814                         }
 815                         if (info.rti_info[RTAX_GATEWAY] != NULL) {
 816                                 RT_UNLOCK(rt);
 817                                 RADIX_NODE_HEAD_LOCK(rnh);
 818                                 RT_LOCK(rt);
 819
 820                                 error = rt_setgate(rt, rt_key(rt),
 821                                     info.rti_info[RTAX_GATEWAY]);
 822                                 RADIX_NODE_HEAD_UNLOCK(rnh);
 823                                 if (error != 0) {
 824                                         RT_UNLOCK(rt);
 825                                         senderr(error);
 826                                 }
 827                                 rt->rt_flags |= (RTF_GATEWAY & info.rti_flags);
 828                         }
 829                         if (info.rti_ifa != NULL &&
 830                             info.rti_ifa != rt->rt_ifa) {
 831                                 ifa_ref(info.rti_ifa);
 832                                 rt->rt_ifa = info.rti_ifa;
 833                                 rt->rt_ifp = info.rti_ifp;
 834                         }
 835                         /* Allow some flags to be toggled on change. */
 836                         rt->rt_flags = (rt->rt_flags & ~RTF_FMASK) |
 837                                     (rtm->rtm_flags & RTF_FMASK);
 838                         rt_setmetrics(rtm->rtm_inits, &rtm->rtm_rmx,
 839                                         &rt->rt_rmx);
 840                         rtm->rtm_index = rt->rt_ifp->if_index;
 841                         if (rt->rt_ifa && rt->rt_ifa->ifa_rtrequest)
 842                                rt->rt_ifa->ifa_rtrequest(RTM_ADD, rt, &info);
 843                         /* FALLTHROUGH */
 844                 case RTM_LOCK:
 845                         /* We don't support locks anymore */
 846                         break;
 847                 }
 848                 RT_UNLOCK(rt);
 849                 break;
 850
 851         default:
 852                 senderr(EOPNOTSUPP);
 853         }
 854
 855 flush:
 856         if (rtm) {
 857                 if (error)
 858                         rtm->rtm_errno = error;
 859                 else
 860                         rtm->rtm_flags |= RTF_DONE;
 861         }
 862         if (rt)         /* XXX can this be true? */
 863                 RTFREE(rt);
 864     {
 865         struct rawcb *rp = NULL;
 866         /*
 867          * Check to see if we don't want our own messages.
 868          */
 869         if ((so->so_options & SO_USELOOPBACK) == 0) {
 870                 if (route_cb.any_count <= 1) {
 871                         if (rtm)
 872                                 Free(rtm);
 873                         m_freem(m);
 874                         return (error);
 875                 }
 876                 /* There is another listener, so construct message */
 877                 rp = sotorawcb(so);
 878         }
 879         if (rtm) {
 880                 m_copyback(m, 0, rtm->rtm_msglen, (caddr_t)rtm);
 881                 if (m->m_pkthdr.len < rtm->rtm_msglen) {
 882                         m_freem(m);
 883                         m = NULL;
 884                 } else if (m->m_pkthdr.len > rtm->rtm_msglen)
 885                         m_adj(m, rtm->rtm_msglen - m->m_pkthdr.len);
 886                 Free(rtm);
 887         }
 888         if (m) {
 889                 if (rp) {
 890                         /*
 891                          * XXX insure we don't get a copy by
 892                          * invalidating our protocol
 893                          */
 894                         unsigned short family = rp->rcb_proto.sp_family;
 895                         rp->rcb_proto.sp_family = 0;
 896                         rt_dispatch(m, info.rti_info[RTAX_DST]);
 897                         rp->rcb_proto.sp_family = family;
 898                 } else
 899                         rt_dispatch(m, info.rti_info[RTAX_DST]);
 900         }
 901     }
 902         return (error);
 903 #undef  sa_equal
 904 }
 905
 906 static void
 907 rt_setmetrics(u_long which, const struct rt_metrics *in,
 908         struct rt_metrics_lite *out)
 909 {
 910 #define metric(f, e) if (which & (f)) out->e = in->e;
 911         /*
 912          * Only these are stored in the routing entry since introduction
 913          * of tcp hostcache. The rest is ignored.
 914          */
 915         metric(RTV_MTU, rmx_mtu);
 916         metric(RTV_WEIGHT, rmx_weight);
 917         /* Userland -> kernel timebase conversion. */
 918         if (which & RTV_EXPIRE)
 919                 out->rmx_expire = in->rmx_expire ?
 920                     in->rmx_expire - time_second + time_uptime : 0;
 921 #undef metric
 922 }
 923
 924 static void
 925 rt_getmetrics(const struct rt_metrics_lite *in, struct rt_metrics *out)
 926 {
 927 #define metric(e) out->e = in->e;
 928         bzero(out, sizeof(*out));
 929         metric(rmx_mtu);
 930         metric(rmx_weight);
 931         /* Kernel -> userland timebase conversion. */
 932         out->rmx_expire = in->rmx_expire ?
 933             in->rmx_expire - time_uptime + time_second : 0;
 934 #undef metric
 935 }
 936
 937 /*
 938  * Extract the addresses of the passed sockaddrs.
 939  * Do a little sanity checking so as to avoid bad memory references.
 940  * This data is derived straight from userland.
 941  */
 942 static int
 943 rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo)
 944 {
 945         struct sockaddr *sa;
 946         int i;
 947
 948         for (i = 0; i < RTAX_MAX && cp < cplim; i++) {
 949                 if ((rtinfo->rti_addrs & (1 << i)) == 0)
 950                         continue;
 951                 sa = (struct sockaddr *)cp;
 952                 /*
 953                  * It won't fit.
 954                  */
 955                 if (cp + sa->sa_len > cplim)
 956                         return (EINVAL);
 957                 /*
 958                  * there are no more.. quit now
 959                  * If there are more bits, they are in error.
 960                  * I've seen this. route(1) can evidently generate these.
 961                  * This causes kernel to core dump.
 962                  * for compatibility, If we see this, point to a safe address.
 963                  */
 964                 if (sa->sa_len == 0) {
 965                         rtinfo->rti_info[i] = &sa_zero;
 966                         return (0); /* should be EINVAL but for compat */
 967                 }
 968                 /* accept it */
 969                 rtinfo->rti_info[i] = sa;
 970                 cp += SA_SIZE(sa);
 971         }
 972         return (0);
 973 }
 974
 975 static struct mbuf *
 976 rt_msg1(int type, struct rt_addrinfo *rtinfo)
 977 {
 978         struct rt_msghdr *rtm;
 979         struct mbuf *m;
 980         int i;
 981         struct sockaddr *sa;
 982         int len, dlen;
 983
 984         switch (type) {
 985
 986         case RTM_DELADDR:
 987         case RTM_NEWADDR:
 988                 len = sizeof(struct ifa_msghdr);
 989                 break;
 990
 991         case RTM_DELMADDR:
 992         case RTM_NEWMADDR:
 993                 len = sizeof(struct ifma_msghdr);
 994                 break;
 995
 996         case RTM_IFINFO:
 997                 len = sizeof(struct if_msghdr);
 998                 break;
 999
1000         case RTM_IFANNOUNCE:
1001         case RTM_IEEE80211:
1002                 len = sizeof(struct if_announcemsghdr);
1003                 break;
1004
1005         default:
1006                 len = sizeof(struct rt_msghdr);
1007         }
1008         if (len > MCLBYTES)
1009                 panic("rt_msg1");
1010         m = m_gethdr(M_DONTWAIT, MT_DATA);
1011         if (m && len > MHLEN) {
1012                 MCLGET(m, M_DONTWAIT);
1013                 if ((m->m_flags & M_EXT) == 0) {
1014                         m_free(m);
1015                         m = NULL;
1016                 }
1017         }
1018         if (m == NULL)
1019                 return (m);
1020         m->m_pkthdr.len = m->m_len = len;
1021         m->m_pkthdr.rcvif = NULL;
1022         rtm = mtod(m, struct rt_msghdr *);
1023         bzero((caddr_t)rtm, len);
1024         for (i = 0; i < RTAX_MAX; i++) {
1025                 if ((sa = rtinfo->rti_info[i]) == NULL)
1026                         continue;
1027                 rtinfo->rti_addrs |= (1 << i);
1028                 dlen = SA_SIZE(sa);
1029                 m_copyback(m, len, dlen, (caddr_t)sa);
1030                 len += dlen;
1031         }
1032         if (m->m_pkthdr.len != len) {
1033                 m_freem(m);
1034                 return (NULL);
1035         }
1036         rtm->rtm_msglen = len;
1037         rtm->rtm_version = RTM_VERSION;
1038         rtm->rtm_type = type;
1039         return (m);
1040 }
1041
1042 static int
1043 rt_msg2(int type, struct rt_addrinfo *rtinfo, caddr_t cp, struct walkarg *w)
1044 {
1045         int i;
1046         int len, dlen, second_time = 0;
1047         caddr_t cp0;
1048
1049         rtinfo->rti_addrs = 0;
1050 again:
1051         switch (type) {
1052
1053         case RTM_DELADDR:
1054         case RTM_NEWADDR:
1055                 len = sizeof(struct ifa_msghdr);
1056                 break;
1057
1058         case RTM_IFINFO:
1059 #ifdef COMPAT_FREEBSD32
1060                 if (w != NULL && w->w_req->flags & SCTL_MASK32) {
1061                         len = sizeof(struct if_msghdr32);
1062                         break;
1063                 }
1064 #endif
1065                 len = sizeof(struct if_msghdr);
1066                 break;
1067
1068         case RTM_NEWMADDR:
1069                 len = sizeof(struct ifma_msghdr);
1070                 break;
1071
1072         default:
1073                 len = sizeof(struct rt_msghdr);
1074         }
1075         cp0 = cp;
1076         if (cp0)
1077                 cp += len;
1078         for (i = 0; i < RTAX_MAX; i++) {
1079                 struct sockaddr *sa;
1080
1081                 if ((sa = rtinfo->rti_info[i]) == NULL)
1082                         continue;
1083                 rtinfo->rti_addrs |= (1 << i);
1084                 dlen = SA_SIZE(sa);
1085                 if (cp) {
1086                         bcopy((caddr_t)sa, cp, (unsigned)dlen);
1087                         cp += dlen;
1088                 }
1089                 len += dlen;
1090         }
1091         len = ALIGN(len);
1092         if (cp == NULL && w != NULL && !second_time) {
1093                 struct walkarg *rw = w;
1094
1095                 if (rw->w_req) {
1096                         if (rw->w_tmemsize < len) {
1097                                 if (rw->w_tmem)
1098                                         free(rw->w_tmem, M_RTABLE);
1099                                 rw->w_tmem = (caddr_t)
1100                                         malloc(len, M_RTABLE, M_NOWAIT);
1101                                 if (rw->w_tmem)
1102                                         rw->w_tmemsize = len;
1103                         }
1104                         if (rw->w_tmem) {
1105                                 cp = rw->w_tmem;
1106                                 second_time = 1;
1107                                 goto again;
1108                         }
1109                 }
1110         }
1111         if (cp) {
1112                 struct rt_msghdr *rtm = (struct rt_msghdr *)cp0;
1113
1114                 rtm->rtm_version = RTM_VERSION;
1115                 rtm->rtm_type = type;
1116                 rtm->rtm_msglen = len;
1117         }
1118         return (len);
1119 }
1120
1121 /*
1122  * This routine is called to generate a message from the routing
1123  * socket indicating that a redirect has occured, a routing lookup
1124  * has failed, or that a protocol has detected timeouts to a particular
1125  * destination.
1126  */
1127 void
1128 rt_missmsg(int type, struct rt_addrinfo *rtinfo, int flags, int error)
1129 {
1130         struct rt_msghdr *rtm;
1131         struct mbuf *m;
1132         struct sockaddr *sa = rtinfo->rti_info[RTAX_DST];
1133
1134         if (route_cb.any_count == 0)
1135                 return;
1136         m = rt_msg1(type, rtinfo);
1137         if (m == NULL)
1138                 return;
1139         rtm = mtod(m, struct rt_msghdr *);
1140         rtm->rtm_flags = RTF_DONE | flags;
1141         rtm->rtm_errno = error;
1142         rtm->rtm_addrs = rtinfo->rti_addrs;
1143         rt_dispatch(m, sa);
1144 }
1145
1146 /*
1147  * This routine is called to generate a message from the routing
1148  * socket indicating that the status of a network interface has changed.
1149  */
1150 void
1151 rt_ifmsg(struct ifnet *ifp)
1152 {
1153         struct if_msghdr *ifm;
1154         struct mbuf *m;
1155         struct rt_addrinfo info;
1156
1157         if (route_cb.any_count == 0)
1158                 return;
1159         bzero((caddr_t)&info, sizeof(info));
1160         m = rt_msg1(RTM_IFINFO, &info);
1161         if (m == NULL)
1162                 return;
1163         ifm = mtod(m, struct if_msghdr *);
1164         ifm->ifm_index = ifp->if_index;
1165         ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
1166         ifm->ifm_data = ifp->if_data;
1167         ifm->ifm_addrs = 0;
1168         rt_dispatch(m, NULL);
1169 }
1170
1171 /*
1172  * This is called to generate messages from the routing socket
1173  * indicating a network interface has had addresses associated with it.
1174  * if we ever reverse the logic and replace messages TO the routing
1175  * socket indicate a request to configure interfaces, then it will
1176  * be unnecessary as the routing socket will automatically generate
1177  * copies of it.
1178  */
1179 void
1180 rt_newaddrmsg(int cmd, struct ifaddr *ifa, int error, struct rtentry *rt)
1181 {
1182         struct rt_addrinfo info;
1183         struct sockaddr *sa = NULL;
1184         int pass;
1185         struct mbuf *m = NULL;
1186         struct ifnet *ifp = ifa->ifa_ifp;
1187
1188         KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE,
1189                 ("unexpected cmd %u", cmd));
1190 #if defined(INET) || defined(INET6)
1191 #ifdef SCTP
1192         /*
1193          * notify the SCTP stack
1194          * this will only get called when an address is added/deleted
1195          * XXX pass the ifaddr struct instead if ifa->ifa_addr...
1196          */
1197         sctp_addr_change(ifa, cmd);
1198 #endif /* SCTP */
1199 #endif
1200         if (route_cb.any_count == 0)
1201                 return;
1202         for (pass = 1; pass < 3; pass++) {
1203                 bzero((caddr_t)&info, sizeof(info));
1204                 if ((cmd == RTM_ADD && pass == 1) ||
1205                     (cmd == RTM_DELETE && pass == 2)) {
1206                         struct ifa_msghdr *ifam;
1207                         int ncmd = cmd == RTM_ADD ? RTM_NEWADDR : RTM_DELADDR;
1208
1209                         info.rti_info[RTAX_IFA] = sa = ifa->ifa_addr;
1210                         info.rti_info[RTAX_IFP] = ifp->if_addr->ifa_addr;
1211                         info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask;
1212                         info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr;
1213                         if ((m = rt_msg1(ncmd, &info)) == NULL)
1214                                 continue;
1215                         ifam = mtod(m, struct ifa_msghdr *);
1216                         ifam->ifam_index = ifp->if_index;
1217                         ifam->ifam_metric = ifa->ifa_metric;
1218                         ifam->ifam_flags = ifa->ifa_flags;
1219                         ifam->ifam_addrs = info.rti_addrs;
1220                 }
1221                 if ((cmd == RTM_ADD && pass == 2) ||
1222                     (cmd == RTM_DELETE && pass == 1)) {
1223                         struct rt_msghdr *rtm;
1224
1225                         if (rt == NULL)
1226                                 continue;
1227                         info.rti_info[RTAX_NETMASK] = rt_mask(rt);
1228                         info.rti_info[RTAX_DST] = sa = rt_key(rt);
1229                         info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
1230                         if ((m = rt_msg1(cmd, &info)) == NULL)
1231                                 continue;
1232                         rtm = mtod(m, struct rt_msghdr *);
1233                         rtm->rtm_index = ifp->if_index;
1234                         rtm->rtm_flags |= rt->rt_flags;
1235                         rtm->rtm_errno = error;
1236                         rtm->rtm_addrs = info.rti_addrs;
1237                 }
1238                 rt_dispatch(m, sa);
1239         }
1240 }
1241
1242 /*
1243  * This is the analogue to the rt_newaddrmsg which performs the same
1244  * function but for multicast group memberhips.  This is easier since
1245  * there is no route state to worry about.
1246  */
1247 void
1248 rt_newmaddrmsg(int cmd, struct ifmultiaddr *ifma)
1249 {
1250         struct rt_addrinfo info;
1251         struct mbuf *m = NULL;
1252         struct ifnet *ifp = ifma->ifma_ifp;
1253         struct ifma_msghdr *ifmam;
1254
1255         if (route_cb.any_count == 0)
1256                 return;
1257
1258         bzero((caddr_t)&info, sizeof(info));
1259         info.rti_info[RTAX_IFA] = ifma->ifma_addr;
1260         info.rti_info[RTAX_IFP] = ifp ? ifp->if_addr->ifa_addr : NULL;
1261         /*
1262          * If a link-layer address is present, present it as a ``gateway''
1263          * (similarly to how ARP entries, e.g., are presented).
1264          */
1265         info.rti_info[RTAX_GATEWAY] = ifma->ifma_lladdr;
1266         m = rt_msg1(cmd, &info);
1267         if (m == NULL)
1268                 return;
1269         ifmam = mtod(m, struct ifma_msghdr *);
1270         KASSERT(ifp != NULL, ("%s: link-layer multicast address w/o ifp\n",
1271             __func__));
1272         ifmam->ifmam_index = ifp->if_index;
1273         ifmam->ifmam_addrs = info.rti_addrs;
1274         rt_dispatch(m, ifma->ifma_addr);
1275 }
1276
1277 static struct mbuf *
1278 rt_makeifannouncemsg(struct ifnet *ifp, int type, int what,
1279         struct rt_addrinfo *info)
1280 {
1281         struct if_announcemsghdr *ifan;
1282         struct mbuf *m;
1283
1284         if (route_cb.any_count == 0)
1285                 return NULL;
1286         bzero((caddr_t)info, sizeof(*info));
1287         m = rt_msg1(type, info);
1288         if (m != NULL) {
1289                 ifan = mtod(m, struct if_announcemsghdr *);
1290                 ifan->ifan_index = ifp->if_index;
1291                 strlcpy(ifan->ifan_name, ifp->if_xname,
1292                         sizeof(ifan->ifan_name));
1293                 ifan->ifan_what = what;
1294         }
1295         return m;
1296 }
1297
1298 /*
1299  * This is called to generate routing socket messages indicating
1300  * IEEE80211 wireless events.
1301  * XXX we piggyback on the RTM_IFANNOUNCE msg format in a clumsy way.
1302  */
1303 void
1304 rt_ieee80211msg(struct ifnet *ifp, int what, void *data, size_t data_len)
1305 {
1306         struct mbuf *m;
1307         struct rt_addrinfo info;
1308
1309         m = rt_makeifannouncemsg(ifp, RTM_IEEE80211, what, &info);
1310         if (m != NULL) {
1311                 /*
1312                  * Append the ieee80211 data.  Try to stick it in the
1313                  * mbuf containing the ifannounce msg; otherwise allocate
1314                  * a new mbuf and append.
1315                  *
1316                  * NB: we assume m is a single mbuf.
1317                  */
1318                 if (data_len > M_TRAILINGSPACE(m)) {
1319                         struct mbuf *n = m_get(M_NOWAIT, MT_DATA);
1320                         if (n == NULL) {
1321                                 m_freem(m);
1322                                 return;
1323                         }
1324                         bcopy(data, mtod(n, void *), data_len);
1325                         n->m_len = data_len;
1326                         m->m_next = n;
1327                 } else if (data_len > 0) {
1328                         bcopy(data, mtod(m, u_int8_t *) + m->m_len, data_len);
1329                         m->m_len += data_len;
1330                 }
1331                 if (m->m_flags & M_PKTHDR)
1332                         m->m_pkthdr.len += data_len;
1333                 mtod(m, struct if_announcemsghdr *)->ifan_msglen += data_len;
1334                 rt_dispatch(m, NULL);
1335         }
1336 }
1337
1338 /*
1339  * This is called to generate routing socket messages indicating
1340  * network interface arrival and departure.
1341  */
1342 void
1343 rt_ifannouncemsg(struct ifnet *ifp, int what)
1344 {
1345         struct mbuf *m;
1346         struct rt_addrinfo info;
1347
1348         m = rt_makeifannouncemsg(ifp, RTM_IFANNOUNCE, what, &info);
1349         if (m != NULL)
1350                 rt_dispatch(m, NULL);
1351 }
1352
1353 static void
1354 rt_dispatch(struct mbuf *m, const struct sockaddr *sa)
1355 {
1356         struct m_tag *tag;
1357
1358         /*
1359          * Preserve the family from the sockaddr, if any, in an m_tag for
1360          * use when injecting the mbuf into the routing socket buffer from
1361          * the netisr.
1362          */
1363         if (sa != NULL) {
1364                 tag = m_tag_get(PACKET_TAG_RTSOCKFAM, sizeof(unsigned short),
1365                     M_NOWAIT);
1366                 if (tag == NULL) {
1367                         m_freem(m);
1368                         return;
1369                 }
1370                 *(unsigned short *)(tag + 1) = sa->sa_family;
1371                 m_tag_prepend(m, tag);
1372         }
1373 #ifdef VIMAGE
1374         if (V_loif)
1375                 m->m_pkthdr.rcvif = V_loif;
1376         else {
1377                 m_freem(m);
1378                 return;
1379         }
1380 #endif
1381         netisr_queue(NETISR_ROUTE, m);  /* mbuf is free'd on failure. */
1382 }
1383
1384 /*
1385  * This is used in dumping the kernel table via sysctl().
1386  */
1387 static int
1388 sysctl_dumpentry(struct radix_node *rn, void *vw)
1389 {
1390         struct walkarg *w = vw;
1391         struct rtentry *rt = (struct rtentry *)rn;
1392         int error = 0, size;
1393         struct rt_addrinfo info;
1394
1395         if (w->w_op == NET_RT_FLAGS && !(rt->rt_flags & w->w_arg))
1396                 return 0;
1397         if ((rt->rt_flags & RTF_HOST) == 0
1398             ? jailed_without_vnet(w->w_req->td->td_ucred)
1399             : prison_if(w->w_req->td->td_ucred, rt_key(rt)) != 0)
1400                 return (0);
1401         bzero((caddr_t)&info, sizeof(info));
1402         info.rti_info[RTAX_DST] = rt_key(rt);
1403         info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
1404         info.rti_info[RTAX_NETMASK] = rt_mask(rt);
1405         info.rti_info[RTAX_GENMASK] = 0;
1406         if (rt->rt_ifp) {
1407                 info.rti_info[RTAX_IFP] = rt->rt_ifp->if_addr->ifa_addr;
1408                 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
1409                 if (rt->rt_ifp->if_flags & IFF_POINTOPOINT)
1410                         info.rti_info[RTAX_BRD] = rt->rt_ifa->ifa_dstaddr;
1411         }
1412         size = rt_msg2(RTM_GET, &info, NULL, w);
1413         if (w->w_req && w->w_tmem) {
1414                 struct rt_msghdr *rtm = (struct rt_msghdr *)w->w_tmem;
1415
1416                 rtm->rtm_flags = rt->rt_flags;
1417                 /*
1418                  * let's be honest about this being a retarded hack
1419                  */
1420                 rtm->rtm_fmask = rt->rt_rmx.rmx_pksent;
1421                 rt_getmetrics(&rt->rt_rmx, &rtm->rtm_rmx);
1422                 rtm->rtm_index = rt->rt_ifp->if_index;
1423                 rtm->rtm_errno = rtm->rtm_pid = rtm->rtm_seq = 0;
1424                 rtm->rtm_addrs = info.rti_addrs;
1425                 error = SYSCTL_OUT(w->w_req, (caddr_t)rtm, size);
1426                 return (error);
1427         }
1428         return (error);
1429 }
1430
1431 #ifdef COMPAT_FREEBSD32
1432 static void
1433 copy_ifdata32(struct if_data *src, struct if_data32 *dst)
1434 {
1435
1436         bzero(dst, sizeof(*dst));
1437         CP(*src, *dst, ifi_type);
1438         CP(*src, *dst, ifi_physical);
1439         CP(*src, *dst, ifi_addrlen);
1440         CP(*src, *dst, ifi_hdrlen);
1441         CP(*src, *dst, ifi_link_state);
1442         CP(*src, *dst, ifi_datalen);
1443         CP(*src, *dst, ifi_mtu);
1444         CP(*src, *dst, ifi_metric);
1445         CP(*src, *dst, ifi_baudrate);
1446         CP(*src, *dst, ifi_ipackets);
1447         CP(*src, *dst, ifi_ierrors);
1448         CP(*src, *dst, ifi_opackets);
1449         CP(*src, *dst, ifi_oerrors);
1450         CP(*src, *dst, ifi_collisions);
1451         CP(*src, *dst, ifi_ibytes);
1452         CP(*src, *dst, ifi_obytes);
1453         CP(*src, *dst, ifi_imcasts);
1454         CP(*src, *dst, ifi_omcasts);
1455         CP(*src, *dst, ifi_iqdrops);
1456         CP(*src, *dst, ifi_noproto);
1457         CP(*src, *dst, ifi_hwassist);
1458         CP(*src, *dst, ifi_epoch);
1459         TV_CP(*src, *dst, ifi_lastchange);
1460 }
1461 #endif
1462
1463 static int
1464 sysctl_iflist(int af, struct walkarg *w)
1465 {
1466         struct ifnet *ifp;
1467         struct ifaddr *ifa;
1468         struct rt_addrinfo info;
1469         int len, error = 0;
1470
1471         bzero((caddr_t)&info, sizeof(info));
1472         IFNET_RLOCK();
1473         TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1474                 if (w->w_arg && w->w_arg != ifp->if_index)
1475                         continue;
1476                 ifa = ifp->if_addr;
1477                 info.rti_info[RTAX_IFP] = ifa->ifa_addr;
1478                 len = rt_msg2(RTM_IFINFO, &info, NULL, w);
1479                 info.rti_info[RTAX_IFP] = NULL;
1480                 if (w->w_req && w->w_tmem) {
1481                         struct if_msghdr *ifm;
1482
1483 #ifdef COMPAT_FREEBSD32
1484                         if (w->w_req->flags & SCTL_MASK32) {
1485                                 struct if_msghdr32 *ifm32;
1486
1487                                 ifm32 = (struct if_msghdr32 *)w->w_tmem;
1488                                 ifm32->ifm_index = ifp->if_index;
1489                                 ifm32->ifm_flags = ifp->if_flags |
1490                                     ifp->if_drv_flags;
1491                                 copy_ifdata32(&ifp->if_data, &ifm32->ifm_data);
1492                                 ifm32->ifm_addrs = info.rti_addrs;
1493                                 error = SYSCTL_OUT(w->w_req, (caddr_t)ifm32,
1494                                     len);
1495                                 goto sysctl_out;
1496                         }
1497 #endif
1498                         ifm = (struct if_msghdr *)w->w_tmem;
1499                         ifm->ifm_index = ifp->if_index;
1500                         ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
1501                         ifm->ifm_data = ifp->if_data;
1502                         ifm->ifm_addrs = info.rti_addrs;
1503                         error = SYSCTL_OUT(w->w_req, (caddr_t)ifm, len);
1504 #ifdef COMPAT_FREEBSD32
1505                 sysctl_out:
1506 #endif
1507                         if (error)
1508                                 goto done;
1509                 }
1510                 while ((ifa = TAILQ_NEXT(ifa, ifa_link)) != NULL) {
1511                         if (af && af != ifa->ifa_addr->sa_family)
1512                                 continue;
1513                         if (prison_if(w->w_req->td->td_ucred,
1514                             ifa->ifa_addr) != 0)
1515                                 continue;
1516                         info.rti_info[RTAX_IFA] = ifa->ifa_addr;
1517                         info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask;
1518                         info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr;
1519                         len = rt_msg2(RTM_NEWADDR, &info, NULL, w);
1520                         if (w->w_req && w->w_tmem) {
1521                                 struct ifa_msghdr *ifam;
1522
1523                                 ifam = (struct ifa_msghdr *)w->w_tmem;
1524                                 ifam->ifam_index = ifa->ifa_ifp->if_index;
1525                                 ifam->ifam_flags = ifa->ifa_flags;
1526                                 ifam->ifam_metric = ifa->ifa_metric;
1527                                 ifam->ifam_addrs = info.rti_addrs;
1528                                 error = SYSCTL_OUT(w->w_req, w->w_tmem, len);
1529                                 if (error)
1530                                         goto done;
1531                         }
1532                 }
1533                 info.rti_info[RTAX_IFA] = info.rti_info[RTAX_NETMASK] =
1534                         info.rti_info[RTAX_BRD] = NULL;
1535         }
1536 done:
1537         IFNET_RUNLOCK();
1538         return (error);
1539 }
1540
1541 static int
1542 sysctl_ifmalist(int af, struct walkarg *w)
1543 {
1544         struct ifnet *ifp;
1545         struct ifmultiaddr *ifma;
1546         struct  rt_addrinfo info;
1547         int     len, error = 0;
1548         struct ifaddr *ifa;
1549
1550         bzero((caddr_t)&info, sizeof(info));
1551         IFNET_RLOCK();
1552         TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1553                 if (w->w_arg && w->w_arg != ifp->if_index)
1554                         continue;
1555                 ifa = ifp->if_addr;
1556                 info.rti_info[RTAX_IFP] = ifa ? ifa->ifa_addr : NULL;
1557                 IF_ADDR_LOCK(ifp);
1558                 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1559                         if (af && af != ifma->ifma_addr->sa_family)
1560                                 continue;
1561                         if (prison_if(w->w_req->td->td_ucred,
1562                             ifma->ifma_addr) != 0)
1563                                 continue;
1564                         info.rti_info[RTAX_IFA] = ifma->ifma_addr;
1565                         info.rti_info[RTAX_GATEWAY] =
1566                             (ifma->ifma_addr->sa_family != AF_LINK) ?
1567                             ifma->ifma_lladdr : NULL;
1568                         len = rt_msg2(RTM_NEWMADDR, &info, NULL, w);
1569                         if (w->w_req && w->w_tmem) {
1570                                 struct ifma_msghdr *ifmam;
1571
1572                                 ifmam = (struct ifma_msghdr *)w->w_tmem;
1573                                 ifmam->ifmam_index = ifma->ifma_ifp->if_index;
1574                                 ifmam->ifmam_flags = 0;
1575                                 ifmam->ifmam_addrs = info.rti_addrs;
1576                                 error = SYSCTL_OUT(w->w_req, w->w_tmem, len);
1577                                 if (error) {
1578                                         IF_ADDR_UNLOCK(ifp);
1579                                         goto done;
1580                                 }
1581                         }
1582                 }
1583                 IF_ADDR_UNLOCK(ifp);
1584         }
1585 done:
1586         IFNET_RUNLOCK();
1587         return (error);
1588 }
1589
1590 static int
1591 sysctl_rtsock(SYSCTL_HANDLER_ARGS)
1592 {
1593         int     *name = (int *)arg1;
1594         u_int   namelen = arg2;
1595         struct radix_node_head *rnh = NULL; /* silence compiler. */
1596         int     i, lim, error = EINVAL;
1597         u_char  af;
1598         struct  walkarg w;
1599
1600         name ++;
1601         namelen--;
1602         if (req->newptr)
1603                 return (EPERM);
1604         if (namelen != 3)
1605                 return ((namelen < 3) ? EISDIR : ENOTDIR);
1606         af = name[0];
1607         if (af > AF_MAX)
1608                 return (EINVAL);
1609         bzero(&w, sizeof(w));
1610         w.w_op = name[1];
1611         w.w_arg = name[2];
1612         w.w_req = req;
1613
1614         error = sysctl_wire_old_buffer(req, 0);
1615         if (error)
1616                 return (error);
1617         switch (w.w_op) {
1618
1619         case NET_RT_DUMP:
1620         case NET_RT_FLAGS:
1621                 if (af == 0) {                  /* dump all tables */
1622                         i = 1;
1623                         lim = AF_MAX;
1624                 } else                          /* dump only one table */
1625                         i = lim = af;
1626
1627                 /*
1628                  * take care of llinfo entries, the caller must
1629                  * specify an AF
1630                  */
1631                 if (w.w_op == NET_RT_FLAGS &&
1632                     (w.w_arg == 0 || w.w_arg & RTF_LLINFO)) {
1633                         if (af != 0)
1634                                 error = lltable_sysctl_dumparp(af, w.w_req);
1635                         else
1636                                 error = EINVAL;
1637                         break;
1638                 }
1639                 /*
1640                  * take care of routing entries
1641                  */
1642                 for (error = 0; error == 0 && i <= lim; i++) {
1643                         rnh = rt_tables_get_rnh(req->td->td_proc->p_fibnum, i);
1644                         if (rnh != NULL) {
1645                                 RADIX_NODE_HEAD_LOCK(rnh);
1646                                 error = rnh->rnh_walktree(rnh,
1647                                     sysctl_dumpentry, &w);
1648                                 RADIX_NODE_HEAD_UNLOCK(rnh);
1649                         } else if (af != 0)
1650                                 error = EAFNOSUPPORT;
1651                 }
1652                 break;
1653
1654         case NET_RT_IFLIST:
1655                 error = sysctl_iflist(af, &w);
1656                 break;
1657
1658         case NET_RT_IFMALIST:
1659                 error = sysctl_ifmalist(af, &w);
1660                 break;
1661         }
1662         if (w.w_tmem)
1663                 free(w.w_tmem, M_RTABLE);
1664         return (error);
1665 }
1666
1667 SYSCTL_NODE(_net, PF_ROUTE, routetable, CTLFLAG_RD, sysctl_rtsock, "");
1668
1669 /*
1670  * Definitions of protocols supported in the ROUTE domain.
1671  */
1672
1673 static struct domain routedomain;               /* or at least forward */
1674
1675 static struct protosw routesw[] = {
1676 {
1677         .pr_type =              SOCK_RAW,
1678         .pr_domain =            &routedomain,
1679         .pr_flags =             PR_ATOMIC|PR_ADDR,
1680         .pr_output =            route_output,
1681         .pr_ctlinput =          raw_ctlinput,
1682         .pr_init =              raw_init,
1683         .pr_usrreqs =           &route_usrreqs
1684 }
1685 };
1686
1687 static struct domain routedomain = {
1688         .dom_family =           PF_ROUTE,
1689         .dom_name =              "route",
1690         .dom_protosw =          routesw,
1691         .dom_protoswNPROTOSW =  &routesw[sizeof(routesw)/sizeof(routesw[0])]
1692 };
1693
1694 VNET_DOMAIN_SET(route);