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_sctp.h"
  33 #include "opt_mpath.h"
  34 #include "opt_inet.h"
  35 #include "opt_inet6.h"
  36
  37 #include <sys/param.h>
  38 #include <sys/jail.h>
  39 #include <sys/kernel.h>
  40 #include <sys/domain.h>
  41 #include <sys/lock.h>
  42 #include <sys/malloc.h>
  43 #include <sys/mbuf.h>
  44 #include <sys/priv.h>
  45 #include <sys/proc.h>
  46 #include <sys/protosw.h>
  47 #include <sys/rwlock.h>
  48 #include <sys/signalvar.h>
  49 #include <sys/socket.h>
  50 #include <sys/socketvar.h>
  51 #include <sys/sysctl.h>
  52 #include <sys/systm.h>
  53
  54 #include <net/if.h>
  55 #include <net/if_dl.h>
  56 #include <net/if_llatbl.h>
  57 #include <net/netisr.h>
  58 #include <net/raw_cb.h>
  59 #include <net/route.h>
  60 #include <net/vnet.h>
  61
  62 #include <netinet/in.h>
  63 #ifdef INET6
  64 #include <netinet6/scope6_var.h>
  65 #endif
  66
  67 #if defined(INET) || defined(INET6)
  68 #ifdef SCTP
  69 extern void sctp_addr_change(struct ifaddr *ifa, int cmd);
  70 #endif /* SCTP */
  71 #endif
  72
  73 MALLOC_DEFINE(M_RTABLE, "routetbl", "routing tables");
  74
  75 /* NB: these are not modified */
  76 static struct   sockaddr route_src = { 2, PF_ROUTE, };
  77 static struct   sockaddr sa_zero   = { sizeof(sa_zero), AF_INET, };
  78
  79 static struct {
  80         int     ip_count;       /* attached w/ AF_INET */
  81         int     ip6_count;      /* attached w/ AF_INET6 */
  82         int     ipx_count;      /* attached w/ AF_IPX */
  83         int     any_count;      /* total attached */
  84 } route_cb;
  85
  86 struct mtx rtsock_mtx;
  87 MTX_SYSINIT(rtsock, &rtsock_mtx, "rtsock route_cb lock", MTX_DEF);
  88
  89 #define RTSOCK_LOCK()   mtx_lock(&rtsock_mtx)
  90 #define RTSOCK_UNLOCK() mtx_unlock(&rtsock_mtx)
  91 #define RTSOCK_LOCK_ASSERT()    mtx_assert(&rtsock_mtx, MA_OWNED)
  92
  93 SYSCTL_NODE(_net, OID_AUTO, route, CTLFLAG_RD, 0, "");
  94
  95 struct walkarg {
  96         int     w_tmemsize;
  97         int     w_op, w_arg;
  98         caddr_t w_tmem;
  99         struct sysctl_req *w_req;
 100 };
 101
 102 static void     rts_input(struct mbuf *m);
 103 static struct mbuf *rt_msg1(int type, struct rt_addrinfo *rtinfo);
 104 static int      rt_msg2(int type, struct rt_addrinfo *rtinfo,
 105                         caddr_t cp, struct walkarg *w);
 106 static int      rt_xaddrs(caddr_t cp, caddr_t cplim,
 107                         struct rt_addrinfo *rtinfo);
 108 static int      sysctl_dumpentry(struct radix_node *rn, void *vw);
 109 static int      sysctl_iflist(int af, struct walkarg *w);
 110 static int      sysctl_ifmalist(int af, struct walkarg *w);
 111 static int      route_output(struct mbuf *m, struct socket *so);
 112 static void     rt_setmetrics(u_long which, const struct rt_metrics *in,
 113                         struct rt_metrics_lite *out);
 114 static void     rt_getmetrics(const struct rt_metrics_lite *in,
 115                         struct rt_metrics *out);
 116 static void     rt_dispatch(struct mbuf *, const struct sockaddr *);
 117
 118 static struct netisr_handler rtsock_nh = {
 119         .nh_name = "rtsock",
 120         .nh_handler = rts_input,
 121         .nh_proto = NETISR_ROUTE,
 122         .nh_policy = NETISR_POLICY_SOURCE,
 123 };
 124
 125 static int
 126 sysctl_route_netisr_maxqlen(SYSCTL_HANDLER_ARGS)
 127 {
 128         int error, qlimit;
 129
 130         netisr_getqlimit(&rtsock_nh, &qlimit);
 131         error = sysctl_handle_int(oidp, &qlimit, 0, req);
 132         if (error || !req->newptr)
 133                 return (error);
 134         if (qlimit < 1)
 135                 return (EINVAL);
 136         return (netisr_setqlimit(&rtsock_nh, qlimit));
 137 }
 138 SYSCTL_PROC(_net_route, OID_AUTO, netisr_maxqlen, CTLTYPE_INT|CTLFLAG_RW,
 139     0, 0, sysctl_route_netisr_maxqlen, "I",
 140     "maximum routing socket dispatch queue length");
 141
 142 static void
 143 rts_init(void)
 144 {
 145         int tmp;
 146
 147         if (TUNABLE_INT_FETCH("net.route.netisr_maxqlen", &tmp))
 148                 rtsock_nh.nh_qlimit = tmp;
 149         netisr_register(&rtsock_nh);
 150 }
 151 SYSINIT(rtsock, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, rts_init, 0);
 152
 153 static void
 154 rts_input(struct mbuf *m)
 155 {
 156         struct sockproto route_proto;
 157         unsigned short *family;
 158         struct m_tag *tag;
 159
 160         route_proto.sp_family = PF_ROUTE;
 161         tag = m_tag_find(m, PACKET_TAG_RTSOCKFAM, NULL);
 162         if (tag != NULL) {
 163                 family = (unsigned short *)(tag + 1);
 164                 route_proto.sp_protocol = *family;
 165                 m_tag_delete(m, tag);
 166         } else
 167                 route_proto.sp_protocol = 0;
 168
 169         raw_input(m, &route_proto, &route_src);
 170 }
 171
 172 /*
 173  * It really doesn't make any sense at all for this code to share much
 174  * with raw_usrreq.c, since its functionality is so restricted.  XXX
 175  */
 176 static void
 177 rts_abort(struct socket *so)
 178 {
 179
 180         raw_usrreqs.pru_abort(so);
 181 }
 182
 183 static void
 184 rts_close(struct socket *so)
 185 {
 186
 187         raw_usrreqs.pru_close(so);
 188 }
 189
 190 /* pru_accept is EOPNOTSUPP */
 191
 192 static int
 193 rts_attach(struct socket *so, int proto, struct thread *td)
 194 {
 195         struct rawcb *rp;
 196         int s, error;
 197
 198         KASSERT(so->so_pcb == NULL, ("rts_attach: so_pcb != NULL"));
 199
 200         /* XXX */
 201         rp = malloc(sizeof *rp, M_PCB, M_WAITOK | M_ZERO);
 202         if (rp == NULL)
 203                 return ENOBUFS;
 204
 205         /*
 206          * The splnet() is necessary to block protocols from sending
 207          * error notifications (like RTM_REDIRECT or RTM_LOSING) while
 208          * this PCB is extant but incompletely initialized.
 209          * Probably we should try to do more of this work beforehand and
 210          * eliminate the spl.
 211          */
 212         s = splnet();
 213         so->so_pcb = (caddr_t)rp;
 214         so->so_fibnum = td->td_proc->p_fibnum;
 215         error = raw_attach(so, proto);
 216         rp = sotorawcb(so);
 217         if (error) {
 218                 splx(s);
 219                 so->so_pcb = NULL;
 220                 free(rp, M_PCB);
 221                 return error;
 222         }
 223         RTSOCK_LOCK();
 224         switch(rp->rcb_proto.sp_protocol) {
 225         case AF_INET:
 226                 route_cb.ip_count++;
 227                 break;
 228         case AF_INET6:
 229                 route_cb.ip6_count++;
 230                 break;
 231         case AF_IPX:
 232                 route_cb.ipx_count++;
 233                 break;
 234         }
 235         route_cb.any_count++;
 236         RTSOCK_UNLOCK();
 237         soisconnected(so);
 238         so->so_options |= SO_USELOOPBACK;
 239         splx(s);
 240         return 0;
 241 }
 242
 243 static int
 244 rts_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 245 {
 246
 247         return (raw_usrreqs.pru_bind(so, nam, td)); /* xxx just EINVAL */
 248 }
 249
 250 static int
 251 rts_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 252 {
 253
 254         return (raw_usrreqs.pru_connect(so, nam, td)); /* XXX just EINVAL */
 255 }
 256
 257 /* pru_connect2 is EOPNOTSUPP */
 258 /* pru_control is EOPNOTSUPP */
 259
 260 static void
 261 rts_detach(struct socket *so)
 262 {
 263         struct rawcb *rp = sotorawcb(so);
 264
 265         KASSERT(rp != NULL, ("rts_detach: rp == NULL"));
 266
 267         RTSOCK_LOCK();
 268         switch(rp->rcb_proto.sp_protocol) {
 269         case AF_INET:
 270                 route_cb.ip_count--;
 271                 break;
 272         case AF_INET6:
 273                 route_cb.ip6_count--;
 274                 break;
 275         case AF_IPX:
 276                 route_cb.ipx_count--;
 277                 break;
 278         }
 279         route_cb.any_count--;
 280         RTSOCK_UNLOCK();
 281         raw_usrreqs.pru_detach(so);
 282 }
 283
 284 static int
 285 rts_disconnect(struct socket *so)
 286 {
 287
 288         return (raw_usrreqs.pru_disconnect(so));
 289 }
 290
 291 /* pru_listen is EOPNOTSUPP */
 292
 293 static int
 294 rts_peeraddr(struct socket *so, struct sockaddr **nam)
 295 {
 296
 297         return (raw_usrreqs.pru_peeraddr(so, nam));
 298 }
 299
 300 /* pru_rcvd is EOPNOTSUPP */
 301 /* pru_rcvoob is EOPNOTSUPP */
 302
 303 static int
 304 rts_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
 305          struct mbuf *control, struct thread *td)
 306 {
 307
 308         return (raw_usrreqs.pru_send(so, flags, m, nam, control, td));
 309 }
 310
 311 /* pru_sense is null */
 312
 313 static int
 314 rts_shutdown(struct socket *so)
 315 {
 316
 317         return (raw_usrreqs.pru_shutdown(so));
 318 }
 319
 320 static int
 321 rts_sockaddr(struct socket *so, struct sockaddr **nam)
 322 {
 323
 324         return (raw_usrreqs.pru_sockaddr(so, nam));
 325 }
 326
 327 static struct pr_usrreqs route_usrreqs = {
 328         .pru_abort =            rts_abort,
 329         .pru_attach =           rts_attach,
 330         .pru_bind =             rts_bind,
 331         .pru_connect =          rts_connect,
 332         .pru_detach =           rts_detach,
 333         .pru_disconnect =       rts_disconnect,
 334         .pru_peeraddr =         rts_peeraddr,
 335         .pru_send =             rts_send,
 336         .pru_shutdown =         rts_shutdown,
 337         .pru_sockaddr =         rts_sockaddr,
 338         .pru_close =            rts_close,
 339 };
 340
 341 #ifndef _SOCKADDR_UNION_DEFINED
 342 #define _SOCKADDR_UNION_DEFINED
 343 /*
 344  * The union of all possible address formats we handle.
 345  */
 346 union sockaddr_union {
 347         struct sockaddr         sa;
 348         struct sockaddr_in      sin;
 349         struct sockaddr_in6     sin6;
 350 };
 351 #endif /* _SOCKADDR_UNION_DEFINED */
 352
 353 static int
 354 rtm_get_jailed(struct rt_addrinfo *info, struct ifnet *ifp,
 355     struct rtentry *rt, union sockaddr_union *saun, struct ucred *cred)
 356 {
 357
 358         /* First, see if the returned address is part of the jail. */
 359         if (prison_if(cred, rt->rt_ifa->ifa_addr) == 0) {
 360                 info->rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
 361                 return (0);
 362         }
 363
 364         switch (info->rti_info[RTAX_DST]->sa_family) {
 365 #ifdef INET
 366         case AF_INET:
 367         {
 368                 struct in_addr ia;
 369                 struct ifaddr *ifa;
 370                 int found;
 371
 372                 found = 0;
 373                 /*
 374                  * Try to find an address on the given outgoing interface
 375                  * that belongs to the jail.
 376                  */
 377                 IF_ADDR_LOCK(ifp);
 378                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 379                         struct sockaddr *sa;
 380                         sa = ifa->ifa_addr;
 381                         if (sa->sa_family != AF_INET)
 382                                 continue;
 383                         ia = ((struct sockaddr_in *)sa)->sin_addr;
 384                         if (prison_check_ip4(cred, &ia) == 0) {
 385                                 found = 1;
 386                                 break;
 387                         }
 388                 }
 389                 IF_ADDR_UNLOCK(ifp);
 390                 if (!found) {
 391                         /*
 392                          * As a last resort return the 'default' jail address.
 393                          */
 394                         ia = ((struct sockaddr_in *)rt->rt_ifa->ifa_addr)->
 395                             sin_addr;
 396                         if (prison_get_ip4(cred, &ia) != 0)
 397                                 return (ESRCH);
 398                 }
 399                 bzero(&saun->sin, sizeof(struct sockaddr_in));
 400                 saun->sin.sin_len = sizeof(struct sockaddr_in);
 401                 saun->sin.sin_family = AF_INET;
 402                 saun->sin.sin_addr.s_addr = ia.s_addr;
 403                 info->rti_info[RTAX_IFA] = (struct sockaddr *)&saun->sin;
 404                 break;
 405         }
 406 #endif
 407 #ifdef INET6
 408         case AF_INET6:
 409         {
 410                 struct in6_addr ia6;
 411                 struct ifaddr *ifa;
 412                 int found;
 413
 414                 found = 0;
 415                 /*
 416                  * Try to find an address on the given outgoing interface
 417                  * that belongs to the jail.
 418                  */
 419                 IF_ADDR_LOCK(ifp);
 420                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 421                         struct sockaddr *sa;
 422                         sa = ifa->ifa_addr;
 423                         if (sa->sa_family != AF_INET6)
 424                                 continue;
 425                         bcopy(&((struct sockaddr_in6 *)sa)->sin6_addr,
 426                             &ia6, sizeof(struct in6_addr));
 427                         if (prison_check_ip6(cred, &ia6) == 0) {
 428                                 found = 1;
 429                                 break;
 430                         }
 431                 }
 432                 IF_ADDR_UNLOCK(ifp);
 433                 if (!found) {
 434                         /*
 435                          * As a last resort return the 'default' jail address.
 436                          */
 437                         ia6 = ((struct sockaddr_in6 *)rt->rt_ifa->ifa_addr)->
 438                             sin6_addr;
 439                         if (prison_get_ip6(cred, &ia6) != 0)
 440                                 return (ESRCH);
 441                 }
 442                 bzero(&saun->sin6, sizeof(struct sockaddr_in6));
 443                 saun->sin6.sin6_len = sizeof(struct sockaddr_in6);
 444                 saun->sin6.sin6_family = AF_INET6;
 445                 bcopy(&ia6, &saun->sin6.sin6_addr, sizeof(struct in6_addr));
 446                 if (sa6_recoverscope(&saun->sin6) != 0)
 447                         return (ESRCH);
 448                 info->rti_info[RTAX_IFA] = (struct sockaddr *)&saun->sin6;
 449                 break;
 450         }
 451 #endif
 452         default:
 453                 return (ESRCH);
 454         }
 455         return (0);
 456 }
 457
 458 /*ARGSUSED*/
 459 static int
 460 route_output(struct mbuf *m, struct socket *so)
 461 {
 462 #define sa_equal(a1, a2) (bcmp((a1), (a2), (a1)->sa_len) == 0)
 463         struct rt_msghdr *rtm = NULL;
 464         struct rtentry *rt = NULL;
 465         struct radix_node_head *rnh;
 466         struct rt_addrinfo info;
 467         int len, error = 0;
 468         struct ifnet *ifp = NULL;
 469         union sockaddr_union saun;
 470
 471 #define senderr(e) { error = e; goto flush;}
 472         if (m == NULL || ((m->m_len < sizeof(long)) &&
 473                        (m = m_pullup(m, sizeof(long))) == NULL))
 474                 return (ENOBUFS);
 475         if ((m->m_flags & M_PKTHDR) == 0)
 476                 panic("route_output");
 477         len = m->m_pkthdr.len;
 478         if (len < sizeof(*rtm) ||
 479             len != mtod(m, struct rt_msghdr *)->rtm_msglen) {
 480                 info.rti_info[RTAX_DST] = NULL;
 481                 senderr(EINVAL);
 482         }
 483         R_Malloc(rtm, struct rt_msghdr *, len);
 484         if (rtm == NULL) {
 485                 info.rti_info[RTAX_DST] = NULL;
 486                 senderr(ENOBUFS);
 487         }
 488         m_copydata(m, 0, len, (caddr_t)rtm);
 489         if (rtm->rtm_version != RTM_VERSION) {
 490                 info.rti_info[RTAX_DST] = NULL;
 491                 senderr(EPROTONOSUPPORT);
 492         }
 493         rtm->rtm_pid = curproc->p_pid;
 494         bzero(&info, sizeof(info));
 495         info.rti_addrs = rtm->rtm_addrs;
 496         if (rt_xaddrs((caddr_t)(rtm + 1), len + (caddr_t)rtm, &info)) {
 497                 info.rti_info[RTAX_DST] = NULL;
 498                 senderr(EINVAL);
 499         }
 500         info.rti_flags = rtm->rtm_flags;
 501         if (info.rti_info[RTAX_DST] == NULL ||
 502             info.rti_info[RTAX_DST]->sa_family >= AF_MAX ||
 503             (info.rti_info[RTAX_GATEWAY] != NULL &&
 504              info.rti_info[RTAX_GATEWAY]->sa_family >= AF_MAX))
 505                 senderr(EINVAL);
 506         /*
 507          * Verify that the caller has the appropriate privilege; RTM_GET
 508          * is the only operation the non-superuser is allowed.
 509          */
 510         if (rtm->rtm_type != RTM_GET) {
 511                 error = priv_check(curthread, PRIV_NET_ROUTE);
 512                 if (error)
 513                         senderr(error);
 514         }
 515
 516         /*
 517          * The given gateway address may be an interface address.
 518          * For example, issuing a "route change" command on a route
 519          * entry that was created from a tunnel, and the gateway
 520          * address given is the local end point. In this case the
 521          * RTF_GATEWAY flag must be cleared or the destination will
 522          * not be reachable even though there is no error message.
 523          */
 524         if (info.rti_info[RTAX_GATEWAY] != NULL &&
 525             info.rti_info[RTAX_GATEWAY]->sa_family != AF_LINK) {
 526                 struct route gw_ro;
 527
 528                 bzero(&gw_ro, sizeof(gw_ro));
 529                 gw_ro.ro_dst = *info.rti_info[RTAX_GATEWAY];
 530                 rtalloc_ign_fib(&gw_ro, 0, so->so_fibnum);
 531                 /*
 532                  * A host route through the loopback interface is
 533                  * installed for each interface adddress. In pre 8.0
 534                  * releases the interface address of a PPP link type
 535                  * is not reachable locally. This behavior is fixed as
 536                  * part of the new L2/L3 redesign and rewrite work. The
 537                  * signature of this interface address route is the
 538                  * AF_LINK sa_family type of the rt_gateway, and the
 539                  * rt_ifp has the IFF_LOOPBACK flag set.
 540                  */
 541                 if (gw_ro.ro_rt != NULL &&
 542                     gw_ro.ro_rt->rt_gateway->sa_family == AF_LINK &&
 543                     gw_ro.ro_rt->rt_ifp->if_flags & IFF_LOOPBACK)
 544                         info.rti_flags &= ~RTF_GATEWAY;
 545                 if (gw_ro.ro_rt != NULL)
 546                         RTFREE(gw_ro.ro_rt);
 547         }
 548
 549         switch (rtm->rtm_type) {
 550                 struct rtentry *saved_nrt;
 551
 552         case RTM_ADD:
 553                 if (info.rti_info[RTAX_GATEWAY] == NULL)
 554                         senderr(EINVAL);
 555                 saved_nrt = NULL;
 556
 557                 /* support for new ARP code */
 558                 if (info.rti_info[RTAX_GATEWAY]->sa_family == AF_LINK &&
 559                     (rtm->rtm_flags & RTF_LLDATA) != 0) {
 560                         error = lla_rt_output(rtm, &info);
 561                         break;
 562                 }
 563                 error = rtrequest1_fib(RTM_ADD, &info, &saved_nrt,
 564                     so->so_fibnum);
 565                 if (error == 0 && saved_nrt) {
 566                         RT_LOCK(saved_nrt);
 567                         rt_setmetrics(rtm->rtm_inits,
 568                                 &rtm->rtm_rmx, &saved_nrt->rt_rmx);
 569                         rtm->rtm_index = saved_nrt->rt_ifp->if_index;
 570                         RT_REMREF(saved_nrt);
 571                         RT_UNLOCK(saved_nrt);
 572                 }
 573                 break;
 574
 575         case RTM_DELETE:
 576                 saved_nrt = NULL;
 577                 /* support for new ARP code */
 578                 if (info.rti_info[RTAX_GATEWAY] &&
 579                     (info.rti_info[RTAX_GATEWAY]->sa_family == AF_LINK) &&
 580                     (rtm->rtm_flags & RTF_LLDATA) != 0) {
 581                         error = lla_rt_output(rtm, &info);
 582                         break;
 583                 }
 584                 error = rtrequest1_fib(RTM_DELETE, &info, &saved_nrt,
 585                     so->so_fibnum);
 586                 if (error == 0) {
 587                         RT_LOCK(saved_nrt);
 588                         rt = saved_nrt;
 589                         goto report;
 590                 }
 591                 break;
 592
 593         case RTM_GET:
 594         case RTM_CHANGE:
 595         case RTM_LOCK:
 596                 rnh = rt_tables_get_rnh(so->so_fibnum,
 597                     info.rti_info[RTAX_DST]->sa_family);
 598                 if (rnh == NULL)
 599                         senderr(EAFNOSUPPORT);
 600                 RADIX_NODE_HEAD_RLOCK(rnh);
 601                 rt = (struct rtentry *) rnh->rnh_lookup(info.rti_info[RTAX_DST],
 602                         info.rti_info[RTAX_NETMASK], rnh);
 603                 if (rt == NULL) {       /* XXX looks bogus */
 604                         RADIX_NODE_HEAD_RUNLOCK(rnh);
 605                         senderr(ESRCH);
 606                 }
 607 #ifdef RADIX_MPATH
 608                 /*
 609                  * for RTM_CHANGE/LOCK, if we got multipath routes,
 610                  * we require users to specify a matching RTAX_GATEWAY.
 611                  *
 612                  * for RTM_GET, gate is optional even with multipath.
 613                  * if gate == NULL the first match is returned.
 614                  * (no need to call rt_mpath_matchgate if gate == NULL)
 615                  */
 616                 if (rn_mpath_capable(rnh) &&
 617                     (rtm->rtm_type != RTM_GET || info.rti_info[RTAX_GATEWAY])) {
 618                         rt = rt_mpath_matchgate(rt, info.rti_info[RTAX_GATEWAY]);
 619                         if (!rt) {
 620                                 RADIX_NODE_HEAD_RUNLOCK(rnh);
 621                                 senderr(ESRCH);
 622                         }
 623                 }
 624 #endif
 625                 RT_LOCK(rt);
 626                 RT_ADDREF(rt);
 627                 RADIX_NODE_HEAD_RUNLOCK(rnh);
 628
 629                 /*
 630                  * Fix for PR: 82974
 631                  *
 632                  * RTM_CHANGE/LOCK need a perfect match, rn_lookup()
 633                  * returns a perfect match in case a netmask is
 634                  * specified.  For host routes only a longest prefix
 635                  * match is returned so it is necessary to compare the
 636                  * existence of the netmask.  If both have a netmask
 637                  * rnh_lookup() did a perfect match and if none of them
 638                  * have a netmask both are host routes which is also a
 639                  * perfect match.
 640                  */
 641
 642                 if (rtm->rtm_type != RTM_GET &&
 643                     (!rt_mask(rt) != !info.rti_info[RTAX_NETMASK])) {
 644                         RT_UNLOCK(rt);
 645                         senderr(ESRCH);
 646                 }
 647
 648                 switch(rtm->rtm_type) {
 649
 650                 case RTM_GET:
 651                 report:
 652                         RT_LOCK_ASSERT(rt);
 653                         if ((rt->rt_flags & RTF_HOST) == 0
 654                             ? jailed(curthread->td_ucred)
 655                             : prison_if(curthread->td_ucred,
 656                             rt_key(rt)) != 0) {
 657                                 RT_UNLOCK(rt);
 658                                 senderr(ESRCH);
 659                         }
 660                         info.rti_info[RTAX_DST] = rt_key(rt);
 661                         info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
 662                         info.rti_info[RTAX_NETMASK] = rt_mask(rt);
 663                         info.rti_info[RTAX_GENMASK] = 0;
 664                         if (rtm->rtm_addrs & (RTA_IFP | RTA_IFA)) {
 665                                 ifp = rt->rt_ifp;
 666                                 if (ifp) {
 667                                         info.rti_info[RTAX_IFP] =
 668                                             ifp->if_addr->ifa_addr;
 669                                         error = rtm_get_jailed(&info, ifp, rt,
 670                                             &saun, curthread->td_ucred);
 671                                         if (error != 0) {
 672                                                 RT_UNLOCK(rt);
 673                                                 senderr(error);
 674                                         }
 675                                         if (ifp->if_flags & IFF_POINTOPOINT)
 676                                                 info.rti_info[RTAX_BRD] =
 677                                                     rt->rt_ifa->ifa_dstaddr;
 678                                         rtm->rtm_index = ifp->if_index;
 679                                 } else {
 680                                         info.rti_info[RTAX_IFP] = NULL;
 681                                         info.rti_info[RTAX_IFA] = NULL;
 682                                 }
 683                         } else if ((ifp = rt->rt_ifp) != NULL) {
 684                                 rtm->rtm_index = ifp->if_index;
 685                         }
 686                         len = rt_msg2(rtm->rtm_type, &info, NULL, NULL);
 687                         if (len > rtm->rtm_msglen) {
 688                                 struct rt_msghdr *new_rtm;
 689                                 R_Malloc(new_rtm, struct rt_msghdr *, len);
 690                                 if (new_rtm == NULL) {
 691                                         RT_UNLOCK(rt);
 692                                         senderr(ENOBUFS);
 693                                 }
 694                                 bcopy(rtm, new_rtm, rtm->rtm_msglen);
 695                                 Free(rtm); rtm = new_rtm;
 696                         }
 697                         (void)rt_msg2(rtm->rtm_type, &info, (caddr_t)rtm, NULL);
 698                         rtm->rtm_flags = rt->rt_flags;
 699                         rt_getmetrics(&rt->rt_rmx, &rtm->rtm_rmx);
 700                         rtm->rtm_addrs = info.rti_addrs;
 701                         break;
 702
 703                 case RTM_CHANGE:
 704                         /*
 705                          * New gateway could require new ifaddr, ifp;
 706                          * flags may also be different; ifp may be specified
 707                          * by ll sockaddr when protocol address is ambiguous
 708                          */
 709                         if (((rt->rt_flags & RTF_GATEWAY) &&
 710                              info.rti_info[RTAX_GATEWAY] != NULL) ||
 711                             info.rti_info[RTAX_IFP] != NULL ||
 712                             (info.rti_info[RTAX_IFA] != NULL &&
 713                              !sa_equal(info.rti_info[RTAX_IFA],
 714                                        rt->rt_ifa->ifa_addr))) {
 715                                 RT_UNLOCK(rt);
 716                                 RADIX_NODE_HEAD_LOCK(rnh);
 717                                 error = rt_getifa_fib(&info, rt->rt_fibnum);
 718                                 /*
 719                                  * XXXRW: Really we should release this
 720                                  * reference later, but this maintains
 721                                  * historical behavior.
 722                                  */
 723                                 if (info.rti_ifa != NULL)
 724                                         ifa_free(info.rti_ifa);
 725                                 RADIX_NODE_HEAD_UNLOCK(rnh);
 726                                 if (error != 0)
 727                                         senderr(error);
 728                                 RT_LOCK(rt);
 729                         }
 730                         if (info.rti_ifa != NULL &&
 731                             info.rti_ifa != rt->rt_ifa &&
 732                             rt->rt_ifa != NULL &&
 733                             rt->rt_ifa->ifa_rtrequest != NULL) {
 734                                 rt->rt_ifa->ifa_rtrequest(RTM_DELETE, rt,
 735                                     &info);
 736                                 ifa_free(rt->rt_ifa);
 737                         }
 738                         if (info.rti_info[RTAX_GATEWAY] != NULL) {
 739                                 RT_UNLOCK(rt);
 740                                 RADIX_NODE_HEAD_LOCK(rnh);
 741                                 RT_LOCK(rt);
 742
 743                                 error = rt_setgate(rt, rt_key(rt),
 744                                     info.rti_info[RTAX_GATEWAY]);
 745                                 RADIX_NODE_HEAD_UNLOCK(rnh);
 746                                 if (error != 0) {
 747                                         RT_UNLOCK(rt);
 748                                         senderr(error);
 749                                 }
 750                                 rt->rt_flags |= (RTF_GATEWAY & info.rti_flags);
 751                         }
 752                         if (info.rti_ifa != NULL &&
 753                             info.rti_ifa != rt->rt_ifa) {
 754                                 ifa_ref(info.rti_ifa);
 755                                 rt->rt_ifa = info.rti_ifa;
 756                                 rt->rt_ifp = info.rti_ifp;
 757                         }
 758                         /* Allow some flags to be toggled on change. */
 759                         rt->rt_flags = (rt->rt_flags & ~RTF_FMASK) |
 760                                     (rtm->rtm_flags & RTF_FMASK);
 761                         rt_setmetrics(rtm->rtm_inits, &rtm->rtm_rmx,
 762                                         &rt->rt_rmx);
 763                         rtm->rtm_index = rt->rt_ifp->if_index;
 764                         if (rt->rt_ifa && rt->rt_ifa->ifa_rtrequest)
 765                                rt->rt_ifa->ifa_rtrequest(RTM_ADD, rt, &info);
 766                         /* FALLTHROUGH */
 767                 case RTM_LOCK:
 768                         /* We don't support locks anymore */
 769                         break;
 770                 }
 771                 RT_UNLOCK(rt);
 772                 break;
 773
 774         default:
 775                 senderr(EOPNOTSUPP);
 776         }
 777
 778 flush:
 779         if (rtm) {
 780                 if (error)
 781                         rtm->rtm_errno = error;
 782                 else
 783                         rtm->rtm_flags |= RTF_DONE;
 784         }
 785         if (rt)         /* XXX can this be true? */
 786                 RTFREE(rt);
 787     {
 788         struct rawcb *rp = NULL;
 789         /*
 790          * Check to see if we don't want our own messages.
 791          */
 792         if ((so->so_options & SO_USELOOPBACK) == 0) {
 793                 if (route_cb.any_count <= 1) {
 794                         if (rtm)
 795                                 Free(rtm);
 796                         m_freem(m);
 797                         return (error);
 798                 }
 799                 /* There is another listener, so construct message */
 800                 rp = sotorawcb(so);
 801         }
 802         if (rtm) {
 803                 m_copyback(m, 0, rtm->rtm_msglen, (caddr_t)rtm);
 804                 if (m->m_pkthdr.len < rtm->rtm_msglen) {
 805                         m_freem(m);
 806                         m = NULL;
 807                 } else if (m->m_pkthdr.len > rtm->rtm_msglen)
 808                         m_adj(m, rtm->rtm_msglen - m->m_pkthdr.len);
 809                 Free(rtm);
 810         }
 811         if (m) {
 812                 if (rp) {
 813                         /*
 814                          * XXX insure we don't get a copy by
 815                          * invalidating our protocol
 816                          */
 817                         unsigned short family = rp->rcb_proto.sp_family;
 818                         rp->rcb_proto.sp_family = 0;
 819                         rt_dispatch(m, info.rti_info[RTAX_DST]);
 820                         rp->rcb_proto.sp_family = family;
 821                 } else
 822                         rt_dispatch(m, info.rti_info[RTAX_DST]);
 823         }
 824     }
 825         return (error);
 826 #undef  sa_equal
 827 }
 828
 829 static void
 830 rt_setmetrics(u_long which, const struct rt_metrics *in,
 831         struct rt_metrics_lite *out)
 832 {
 833 #define metric(f, e) if (which & (f)) out->e = in->e;
 834         /*
 835          * Only these are stored in the routing entry since introduction
 836          * of tcp hostcache. The rest is ignored.
 837          */
 838         metric(RTV_MTU, rmx_mtu);
 839         metric(RTV_WEIGHT, rmx_weight);
 840         /* Userland -> kernel timebase conversion. */
 841         if (which & RTV_EXPIRE)
 842                 out->rmx_expire = in->rmx_expire ?
 843                     in->rmx_expire - time_second + time_uptime : 0;
 844 #undef metric
 845 }
 846
 847 static void
 848 rt_getmetrics(const struct rt_metrics_lite *in, struct rt_metrics *out)
 849 {
 850 #define metric(e) out->e = in->e;
 851         bzero(out, sizeof(*out));
 852         metric(rmx_mtu);
 853         metric(rmx_weight);
 854         /* Kernel -> userland timebase conversion. */
 855         out->rmx_expire = in->rmx_expire ?
 856             in->rmx_expire - time_uptime + time_second : 0;
 857 #undef metric
 858 }
 859
 860 /*
 861  * Extract the addresses of the passed sockaddrs.
 862  * Do a little sanity checking so as to avoid bad memory references.
 863  * This data is derived straight from userland.
 864  */
 865 static int
 866 rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo)
 867 {
 868         struct sockaddr *sa;
 869         int i;
 870
 871         for (i = 0; i < RTAX_MAX && cp < cplim; i++) {
 872                 if ((rtinfo->rti_addrs & (1 << i)) == 0)
 873                         continue;
 874                 sa = (struct sockaddr *)cp;
 875                 /*
 876                  * It won't fit.
 877                  */
 878                 if (cp + sa->sa_len > cplim)
 879                         return (EINVAL);
 880                 /*
 881                  * there are no more.. quit now
 882                  * If there are more bits, they are in error.
 883                  * I've seen this. route(1) can evidently generate these.
 884                  * This causes kernel to core dump.
 885                  * for compatibility, If we see this, point to a safe address.
 886                  */
 887                 if (sa->sa_len == 0) {
 888                         rtinfo->rti_info[i] = &sa_zero;
 889                         return (0); /* should be EINVAL but for compat */
 890                 }
 891                 /* accept it */
 892                 rtinfo->rti_info[i] = sa;
 893                 cp += SA_SIZE(sa);
 894         }
 895         return (0);
 896 }
 897
 898 static struct mbuf *
 899 rt_msg1(int type, struct rt_addrinfo *rtinfo)
 900 {
 901         struct rt_msghdr *rtm;
 902         struct mbuf *m;
 903         int i;
 904         struct sockaddr *sa;
 905         int len, dlen;
 906
 907         switch (type) {
 908
 909         case RTM_DELADDR:
 910         case RTM_NEWADDR:
 911                 len = sizeof(struct ifa_msghdr);
 912                 break;
 913
 914         case RTM_DELMADDR:
 915         case RTM_NEWMADDR:
 916                 len = sizeof(struct ifma_msghdr);
 917                 break;
 918
 919         case RTM_IFINFO:
 920                 len = sizeof(struct if_msghdr);
 921                 break;
 922
 923         case RTM_IFANNOUNCE:
 924         case RTM_IEEE80211:
 925                 len = sizeof(struct if_announcemsghdr);
 926                 break;
 927
 928         default:
 929                 len = sizeof(struct rt_msghdr);
 930         }
 931         if (len > MCLBYTES)
 932                 panic("rt_msg1");
 933         m = m_gethdr(M_DONTWAIT, MT_DATA);
 934         if (m && len > MHLEN) {
 935                 MCLGET(m, M_DONTWAIT);
 936                 if ((m->m_flags & M_EXT) == 0) {
 937                         m_free(m);
 938                         m = NULL;
 939                 }
 940         }
 941         if (m == NULL)
 942                 return (m);
 943         m->m_pkthdr.len = m->m_len = len;
 944         m->m_pkthdr.rcvif = NULL;
 945         rtm = mtod(m, struct rt_msghdr *);
 946         bzero((caddr_t)rtm, len);
 947         for (i = 0; i < RTAX_MAX; i++) {
 948                 if ((sa = rtinfo->rti_info[i]) == NULL)
 949                         continue;
 950                 rtinfo->rti_addrs |= (1 << i);
 951                 dlen = SA_SIZE(sa);
 952                 m_copyback(m, len, dlen, (caddr_t)sa);
 953                 len += dlen;
 954         }
 955         if (m->m_pkthdr.len != len) {
 956                 m_freem(m);
 957                 return (NULL);
 958         }
 959         rtm->rtm_msglen = len;
 960         rtm->rtm_version = RTM_VERSION;
 961         rtm->rtm_type = type;
 962         return (m);
 963 }
 964
 965 static int
 966 rt_msg2(int type, struct rt_addrinfo *rtinfo, caddr_t cp, struct walkarg *w)
 967 {
 968         int i;
 969         int len, dlen, second_time = 0;
 970         caddr_t cp0;
 971
 972         rtinfo->rti_addrs = 0;
 973 again:
 974         switch (type) {
 975
 976         case RTM_DELADDR:
 977         case RTM_NEWADDR:
 978                 len = sizeof(struct ifa_msghdr);
 979                 break;
 980
 981         case RTM_IFINFO:
 982                 len = sizeof(struct if_msghdr);
 983                 break;
 984
 985         case RTM_NEWMADDR:
 986                 len = sizeof(struct ifma_msghdr);
 987                 break;
 988
 989         default:
 990                 len = sizeof(struct rt_msghdr);
 991         }
 992         cp0 = cp;
 993         if (cp0)
 994                 cp += len;
 995         for (i = 0; i < RTAX_MAX; i++) {
 996                 struct sockaddr *sa;
 997
 998                 if ((sa = rtinfo->rti_info[i]) == NULL)
 999                         continue;
1000                 rtinfo->rti_addrs |= (1 << i);
1001                 dlen = SA_SIZE(sa);
1002                 if (cp) {
1003                         bcopy((caddr_t)sa, cp, (unsigned)dlen);
1004                         cp += dlen;
1005                 }
1006                 len += dlen;
1007         }
1008         len = ALIGN(len);
1009         if (cp == NULL && w != NULL && !second_time) {
1010                 struct walkarg *rw = w;
1011
1012                 if (rw->w_req) {
1013                         if (rw->w_tmemsize < len) {
1014                                 if (rw->w_tmem)
1015                                         free(rw->w_tmem, M_RTABLE);
1016                                 rw->w_tmem = (caddr_t)
1017                                         malloc(len, M_RTABLE, M_NOWAIT);
1018                                 if (rw->w_tmem)
1019                                         rw->w_tmemsize = len;
1020                         }
1021                         if (rw->w_tmem) {
1022                                 cp = rw->w_tmem;
1023                                 second_time = 1;
1024                                 goto again;
1025                         }
1026                 }
1027         }
1028         if (cp) {
1029                 struct rt_msghdr *rtm = (struct rt_msghdr *)cp0;
1030
1031                 rtm->rtm_version = RTM_VERSION;
1032                 rtm->rtm_type = type;
1033                 rtm->rtm_msglen = len;
1034         }
1035         return (len);
1036 }
1037
1038 /*
1039  * This routine is called to generate a message from the routing
1040  * socket indicating that a redirect has occured, a routing lookup
1041  * has failed, or that a protocol has detected timeouts to a particular
1042  * destination.
1043  */
1044 void
1045 rt_missmsg(int type, struct rt_addrinfo *rtinfo, int flags, int error)
1046 {
1047         struct rt_msghdr *rtm;
1048         struct mbuf *m;
1049         struct sockaddr *sa = rtinfo->rti_info[RTAX_DST];
1050
1051         if (route_cb.any_count == 0)
1052                 return;
1053         m = rt_msg1(type, rtinfo);
1054         if (m == NULL)
1055                 return;
1056         rtm = mtod(m, struct rt_msghdr *);
1057         rtm->rtm_flags = RTF_DONE | flags;
1058         rtm->rtm_errno = error;
1059         rtm->rtm_addrs = rtinfo->rti_addrs;
1060         rt_dispatch(m, sa);
1061 }
1062
1063 /*
1064  * This routine is called to generate a message from the routing
1065  * socket indicating that the status of a network interface has changed.
1066  */
1067 void
1068 rt_ifmsg(struct ifnet *ifp)
1069 {
1070         struct if_msghdr *ifm;
1071         struct mbuf *m;
1072         struct rt_addrinfo info;
1073
1074         if (route_cb.any_count == 0)
1075                 return;
1076         bzero((caddr_t)&info, sizeof(info));
1077         m = rt_msg1(RTM_IFINFO, &info);
1078         if (m == NULL)
1079                 return;
1080         ifm = mtod(m, struct if_msghdr *);
1081         ifm->ifm_index = ifp->if_index;
1082         ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
1083         ifm->ifm_data = ifp->if_data;
1084         ifm->ifm_addrs = 0;
1085         rt_dispatch(m, NULL);
1086 }
1087
1088 /*
1089  * This is called to generate messages from the routing socket
1090  * indicating a network interface has had addresses associated with it.
1091  * if we ever reverse the logic and replace messages TO the routing
1092  * socket indicate a request to configure interfaces, then it will
1093  * be unnecessary as the routing socket will automatically generate
1094  * copies of it.
1095  */
1096 void
1097 rt_newaddrmsg(int cmd, struct ifaddr *ifa, int error, struct rtentry *rt)
1098 {
1099         struct rt_addrinfo info;
1100         struct sockaddr *sa = NULL;
1101         int pass;
1102         struct mbuf *m = NULL;
1103         struct ifnet *ifp = ifa->ifa_ifp;
1104
1105         KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE,
1106                 ("unexpected cmd %u", cmd));
1107 #if defined(INET) || defined(INET6)
1108 #ifdef SCTP
1109         /*
1110          * notify the SCTP stack
1111          * this will only get called when an address is added/deleted
1112          * XXX pass the ifaddr struct instead if ifa->ifa_addr...
1113          */
1114         sctp_addr_change(ifa, cmd);
1115 #endif /* SCTP */
1116 #endif
1117         if (route_cb.any_count == 0)
1118                 return;
1119         for (pass = 1; pass < 3; pass++) {
1120                 bzero((caddr_t)&info, sizeof(info));
1121                 if ((cmd == RTM_ADD && pass == 1) ||
1122                     (cmd == RTM_DELETE && pass == 2)) {
1123                         struct ifa_msghdr *ifam;
1124                         int ncmd = cmd == RTM_ADD ? RTM_NEWADDR : RTM_DELADDR;
1125
1126                         info.rti_info[RTAX_IFA] = sa = ifa->ifa_addr;
1127                         info.rti_info[RTAX_IFP] = ifp->if_addr->ifa_addr;
1128                         info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask;
1129                         info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr;
1130                         if ((m = rt_msg1(ncmd, &info)) == NULL)
1131                                 continue;
1132                         ifam = mtod(m, struct ifa_msghdr *);
1133                         ifam->ifam_index = ifp->if_index;
1134                         ifam->ifam_metric = ifa->ifa_metric;
1135                         ifam->ifam_flags = ifa->ifa_flags;
1136                         ifam->ifam_addrs = info.rti_addrs;
1137                 }
1138                 if ((cmd == RTM_ADD && pass == 2) ||
1139                     (cmd == RTM_DELETE && pass == 1)) {
1140                         struct rt_msghdr *rtm;
1141
1142                         if (rt == NULL)
1143                                 continue;
1144                         info.rti_info[RTAX_NETMASK] = rt_mask(rt);
1145                         info.rti_info[RTAX_DST] = sa = rt_key(rt);
1146                         info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
1147                         if ((m = rt_msg1(cmd, &info)) == NULL)
1148                                 continue;
1149                         rtm = mtod(m, struct rt_msghdr *);
1150                         rtm->rtm_index = ifp->if_index;
1151                         rtm->rtm_flags |= rt->rt_flags;
1152                         rtm->rtm_errno = error;
1153                         rtm->rtm_addrs = info.rti_addrs;
1154                 }
1155                 rt_dispatch(m, sa);
1156         }
1157 }
1158
1159 /*
1160  * This is the analogue to the rt_newaddrmsg which performs the same
1161  * function but for multicast group memberhips.  This is easier since
1162  * there is no route state to worry about.
1163  */
1164 void
1165 rt_newmaddrmsg(int cmd, struct ifmultiaddr *ifma)
1166 {
1167         struct rt_addrinfo info;
1168         struct mbuf *m = NULL;
1169         struct ifnet *ifp = ifma->ifma_ifp;
1170         struct ifma_msghdr *ifmam;
1171
1172         if (route_cb.any_count == 0)
1173                 return;
1174
1175         bzero((caddr_t)&info, sizeof(info));
1176         info.rti_info[RTAX_IFA] = ifma->ifma_addr;
1177         info.rti_info[RTAX_IFP] = ifp ? ifp->if_addr->ifa_addr : NULL;
1178         /*
1179          * If a link-layer address is present, present it as a ``gateway''
1180          * (similarly to how ARP entries, e.g., are presented).
1181          */
1182         info.rti_info[RTAX_GATEWAY] = ifma->ifma_lladdr;
1183         m = rt_msg1(cmd, &info);
1184         if (m == NULL)
1185                 return;
1186         ifmam = mtod(m, struct ifma_msghdr *);
1187         KASSERT(ifp != NULL, ("%s: link-layer multicast address w/o ifp\n",
1188             __func__));
1189         ifmam->ifmam_index = ifp->if_index;
1190         ifmam->ifmam_addrs = info.rti_addrs;
1191         rt_dispatch(m, ifma->ifma_addr);
1192 }
1193
1194 static struct mbuf *
1195 rt_makeifannouncemsg(struct ifnet *ifp, int type, int what,
1196         struct rt_addrinfo *info)
1197 {
1198         struct if_announcemsghdr *ifan;
1199         struct mbuf *m;
1200
1201         if (route_cb.any_count == 0)
1202                 return NULL;
1203         bzero((caddr_t)info, sizeof(*info));
1204         m = rt_msg1(type, info);
1205         if (m != NULL) {
1206                 ifan = mtod(m, struct if_announcemsghdr *);
1207                 ifan->ifan_index = ifp->if_index;
1208                 strlcpy(ifan->ifan_name, ifp->if_xname,
1209                         sizeof(ifan->ifan_name));
1210                 ifan->ifan_what = what;
1211         }
1212         return m;
1213 }
1214
1215 /*
1216  * This is called to generate routing socket messages indicating
1217  * IEEE80211 wireless events.
1218  * XXX we piggyback on the RTM_IFANNOUNCE msg format in a clumsy way.
1219  */
1220 void
1221 rt_ieee80211msg(struct ifnet *ifp, int what, void *data, size_t data_len)
1222 {
1223         struct mbuf *m;
1224         struct rt_addrinfo info;
1225
1226         m = rt_makeifannouncemsg(ifp, RTM_IEEE80211, what, &info);
1227         if (m != NULL) {
1228                 /*
1229                  * Append the ieee80211 data.  Try to stick it in the
1230                  * mbuf containing the ifannounce msg; otherwise allocate
1231                  * a new mbuf and append.
1232                  *
1233                  * NB: we assume m is a single mbuf.
1234                  */
1235                 if (data_len > M_TRAILINGSPACE(m)) {
1236                         struct mbuf *n = m_get(M_NOWAIT, MT_DATA);
1237                         if (n == NULL) {
1238                                 m_freem(m);
1239                                 return;
1240                         }
1241                         bcopy(data, mtod(n, void *), data_len);
1242                         n->m_len = data_len;
1243                         m->m_next = n;
1244                 } else if (data_len > 0) {
1245                         bcopy(data, mtod(m, u_int8_t *) + m->m_len, data_len);
1246                         m->m_len += data_len;
1247                 }
1248                 if (m->m_flags & M_PKTHDR)
1249                         m->m_pkthdr.len += data_len;
1250                 mtod(m, struct if_announcemsghdr *)->ifan_msglen += data_len;
1251                 rt_dispatch(m, NULL);
1252         }
1253 }
1254
1255 /*
1256  * This is called to generate routing socket messages indicating
1257  * network interface arrival and departure.
1258  */
1259 void
1260 rt_ifannouncemsg(struct ifnet *ifp, int what)
1261 {
1262         struct mbuf *m;
1263         struct rt_addrinfo info;
1264
1265         m = rt_makeifannouncemsg(ifp, RTM_IFANNOUNCE, what, &info);
1266         if (m != NULL)
1267                 rt_dispatch(m, NULL);
1268 }
1269
1270 static void
1271 rt_dispatch(struct mbuf *m, const struct sockaddr *sa)
1272 {
1273         struct m_tag *tag;
1274
1275         /*
1276          * Preserve the family from the sockaddr, if any, in an m_tag for
1277          * use when injecting the mbuf into the routing socket buffer from
1278          * the netisr.
1279          */
1280         if (sa != NULL) {
1281                 tag = m_tag_get(PACKET_TAG_RTSOCKFAM, sizeof(unsigned short),
1282                     M_NOWAIT);
1283                 if (tag == NULL) {
1284                         m_freem(m);
1285                         return;
1286                 }
1287                 *(unsigned short *)(tag + 1) = sa->sa_family;
1288                 m_tag_prepend(m, tag);
1289         }
1290 #ifdef VIMAGE
1291         if (V_loif)
1292                 m->m_pkthdr.rcvif = V_loif;
1293         else {
1294                 m_freem(m);
1295                 return;
1296         }
1297 #endif
1298         netisr_queue(NETISR_ROUTE, m);  /* mbuf is free'd on failure. */
1299 }
1300
1301 /*
1302  * This is used in dumping the kernel table via sysctl().
1303  */
1304 static int
1305 sysctl_dumpentry(struct radix_node *rn, void *vw)
1306 {
1307         struct walkarg *w = vw;
1308         struct rtentry *rt = (struct rtentry *)rn;
1309         int error = 0, size;
1310         struct rt_addrinfo info;
1311
1312         if (w->w_op == NET_RT_FLAGS && !(rt->rt_flags & w->w_arg))
1313                 return 0;
1314         if ((rt->rt_flags & RTF_HOST) == 0
1315             ? jailed(w->w_req->td->td_ucred)
1316             : prison_if(w->w_req->td->td_ucred, rt_key(rt)) != 0)
1317                 return (0);
1318         bzero((caddr_t)&info, sizeof(info));
1319         info.rti_info[RTAX_DST] = rt_key(rt);
1320         info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
1321         info.rti_info[RTAX_NETMASK] = rt_mask(rt);
1322         info.rti_info[RTAX_GENMASK] = 0;
1323         if (rt->rt_ifp) {
1324                 info.rti_info[RTAX_IFP] = rt->rt_ifp->if_addr->ifa_addr;
1325                 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
1326                 if (rt->rt_ifp->if_flags & IFF_POINTOPOINT)
1327                         info.rti_info[RTAX_BRD] = rt->rt_ifa->ifa_dstaddr;
1328         }
1329         size = rt_msg2(RTM_GET, &info, NULL, w);
1330         if (w->w_req && w->w_tmem) {
1331                 struct rt_msghdr *rtm = (struct rt_msghdr *)w->w_tmem;
1332
1333                 rtm->rtm_flags = rt->rt_flags;
1334                 /*
1335                  * let's be honest about this being a retarded hack
1336                  */
1337                 rtm->rtm_fmask = rt->rt_rmx.rmx_pksent;
1338                 rt_getmetrics(&rt->rt_rmx, &rtm->rtm_rmx);
1339                 rtm->rtm_index = rt->rt_ifp->if_index;
1340                 rtm->rtm_errno = rtm->rtm_pid = rtm->rtm_seq = 0;
1341                 rtm->rtm_addrs = info.rti_addrs;
1342                 error = SYSCTL_OUT(w->w_req, (caddr_t)rtm, size);
1343                 return (error);
1344         }
1345         return (error);
1346 }
1347
1348 static int
1349 sysctl_iflist(int af, struct walkarg *w)
1350 {
1351         struct ifnet *ifp;
1352         struct ifaddr *ifa;
1353         struct rt_addrinfo info;
1354         int len, error = 0;
1355
1356         bzero((caddr_t)&info, sizeof(info));
1357         IFNET_RLOCK();
1358         TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1359                 if (w->w_arg && w->w_arg != ifp->if_index)
1360                         continue;
1361                 ifa = ifp->if_addr;
1362                 info.rti_info[RTAX_IFP] = ifa->ifa_addr;
1363                 len = rt_msg2(RTM_IFINFO, &info, NULL, w);
1364                 info.rti_info[RTAX_IFP] = NULL;
1365                 if (w->w_req && w->w_tmem) {
1366                         struct if_msghdr *ifm;
1367
1368                         ifm = (struct if_msghdr *)w->w_tmem;
1369                         ifm->ifm_index = ifp->if_index;
1370                         ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
1371                         ifm->ifm_data = ifp->if_data;
1372                         ifm->ifm_addrs = info.rti_addrs;
1373                         error = SYSCTL_OUT(w->w_req,(caddr_t)ifm, len);
1374                         if (error)
1375                                 goto done;
1376                 }
1377                 while ((ifa = TAILQ_NEXT(ifa, ifa_link)) != NULL) {
1378                         if (af && af != ifa->ifa_addr->sa_family)
1379                                 continue;
1380                         if (prison_if(w->w_req->td->td_ucred,
1381                             ifa->ifa_addr) != 0)
1382                                 continue;
1383                         info.rti_info[RTAX_IFA] = ifa->ifa_addr;
1384                         info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask;
1385                         info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr;
1386                         len = rt_msg2(RTM_NEWADDR, &info, NULL, w);
1387                         if (w->w_req && w->w_tmem) {
1388                                 struct ifa_msghdr *ifam;
1389
1390                                 ifam = (struct ifa_msghdr *)w->w_tmem;
1391                                 ifam->ifam_index = ifa->ifa_ifp->if_index;
1392                                 ifam->ifam_flags = ifa->ifa_flags;
1393                                 ifam->ifam_metric = ifa->ifa_metric;
1394                                 ifam->ifam_addrs = info.rti_addrs;
1395                                 error = SYSCTL_OUT(w->w_req, w->w_tmem, len);
1396                                 if (error)
1397                                         goto done;
1398                         }
1399                 }
1400                 info.rti_info[RTAX_IFA] = info.rti_info[RTAX_NETMASK] =
1401                         info.rti_info[RTAX_BRD] = NULL;
1402         }
1403 done:
1404         IFNET_RUNLOCK();
1405         return (error);
1406 }
1407
1408 static int
1409 sysctl_ifmalist(int af, struct walkarg *w)
1410 {
1411         struct ifnet *ifp;
1412         struct ifmultiaddr *ifma;
1413         struct  rt_addrinfo info;
1414         int     len, error = 0;
1415         struct ifaddr *ifa;
1416
1417         bzero((caddr_t)&info, sizeof(info));
1418         IFNET_RLOCK();
1419         TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1420                 if (w->w_arg && w->w_arg != ifp->if_index)
1421                         continue;
1422                 ifa = ifp->if_addr;
1423                 info.rti_info[RTAX_IFP] = ifa ? ifa->ifa_addr : NULL;
1424                 IF_ADDR_LOCK(ifp);
1425                 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1426                         if (af && af != ifma->ifma_addr->sa_family)
1427                                 continue;
1428                         if (prison_if(w->w_req->td->td_ucred,
1429                             ifma->ifma_addr) != 0)
1430                                 continue;
1431                         info.rti_info[RTAX_IFA] = ifma->ifma_addr;
1432                         info.rti_info[RTAX_GATEWAY] =
1433                             (ifma->ifma_addr->sa_family != AF_LINK) ?
1434                             ifma->ifma_lladdr : NULL;
1435                         len = rt_msg2(RTM_NEWMADDR, &info, NULL, w);
1436                         if (w->w_req && w->w_tmem) {
1437                                 struct ifma_msghdr *ifmam;
1438
1439                                 ifmam = (struct ifma_msghdr *)w->w_tmem;
1440                                 ifmam->ifmam_index = ifma->ifma_ifp->if_index;
1441                                 ifmam->ifmam_flags = 0;
1442                                 ifmam->ifmam_addrs = info.rti_addrs;
1443                                 error = SYSCTL_OUT(w->w_req, w->w_tmem, len);
1444                                 if (error) {
1445                                         IF_ADDR_UNLOCK(ifp);
1446                                         goto done;
1447                                 }
1448                         }
1449                 }
1450                 IF_ADDR_UNLOCK(ifp);
1451         }
1452 done:
1453         IFNET_RUNLOCK();
1454         return (error);
1455 }
1456
1457 static int
1458 sysctl_rtsock(SYSCTL_HANDLER_ARGS)
1459 {
1460         int     *name = (int *)arg1;
1461         u_int   namelen = arg2;
1462         struct radix_node_head *rnh = NULL; /* silence compiler. */
1463         int     i, lim, error = EINVAL;
1464         u_char  af;
1465         struct  walkarg w;
1466
1467         name ++;
1468         namelen--;
1469         if (req->newptr)
1470                 return (EPERM);
1471         if (namelen != 3)
1472                 return ((namelen < 3) ? EISDIR : ENOTDIR);
1473         af = name[0];
1474         if (af > AF_MAX)
1475                 return (EINVAL);
1476         bzero(&w, sizeof(w));
1477         w.w_op = name[1];
1478         w.w_arg = name[2];
1479         w.w_req = req;
1480
1481         error = sysctl_wire_old_buffer(req, 0);
1482         if (error)
1483                 return (error);
1484         switch (w.w_op) {
1485
1486         case NET_RT_DUMP:
1487         case NET_RT_FLAGS:
1488                 if (af == 0) {                  /* dump all tables */
1489                         i = 1;
1490                         lim = AF_MAX;
1491                 } else                          /* dump only one table */
1492                         i = lim = af;
1493
1494                 /*
1495                  * take care of llinfo entries, the caller must
1496                  * specify an AF
1497                  */
1498                 if (w.w_op == NET_RT_FLAGS &&
1499                     (w.w_arg == 0 || w.w_arg & RTF_LLINFO)) {
1500                         if (af != 0)
1501                                 error = lltable_sysctl_dumparp(af, w.w_req);
1502                         else
1503                                 error = EINVAL;
1504                         break;
1505                 }
1506                 /*
1507                  * take care of routing entries
1508                  */
1509                 for (error = 0; error == 0 && i <= lim; i++) {
1510                         rnh = rt_tables_get_rnh(req->td->td_proc->p_fibnum, i);
1511                         if (rnh != NULL) {
1512                                 RADIX_NODE_HEAD_LOCK(rnh);
1513                                 error = rnh->rnh_walktree(rnh,
1514                                     sysctl_dumpentry, &w);
1515                                 RADIX_NODE_HEAD_UNLOCK(rnh);
1516                         } else if (af != 0)
1517                                 error = EAFNOSUPPORT;
1518                 }
1519                 break;
1520
1521         case NET_RT_IFLIST:
1522                 error = sysctl_iflist(af, &w);
1523                 break;
1524
1525         case NET_RT_IFMALIST:
1526                 error = sysctl_ifmalist(af, &w);
1527                 break;
1528         }
1529         if (w.w_tmem)
1530                 free(w.w_tmem, M_RTABLE);
1531         return (error);
1532 }
1533
1534 SYSCTL_NODE(_net, PF_ROUTE, routetable, CTLFLAG_RD, sysctl_rtsock, "");
1535
1536 /*
1537  * Definitions of protocols supported in the ROUTE domain.
1538  */
1539
1540 static struct domain routedomain;               /* or at least forward */
1541
1542 static struct protosw routesw[] = {
1543 {
1544         .pr_type =              SOCK_RAW,
1545         .pr_domain =            &routedomain,
1546         .pr_flags =             PR_ATOMIC|PR_ADDR,
1547         .pr_output =            route_output,
1548         .pr_ctlinput =          raw_ctlinput,
1549         .pr_init =              raw_init,
1550         .pr_usrreqs =           &route_usrreqs
1551 }
1552 };
1553
1554 static struct domain routedomain = {
1555         .dom_family =           PF_ROUTE,
1556         .dom_name =              "route",
1557         .dom_protosw =          routesw,
1558         .dom_protoswNPROTOSW =  &routesw[sizeof(routesw)/sizeof(routesw[0])]
1559 };
1560
1561 VNET_DOMAIN_SET(route);