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 /*
 126  * Used by rtsock/raw_input callback code to decide whether to filter the update
 127  * notification to a socket bound to a particular FIB.
 128  */
 129 #define RTS_FILTER_FIB  M_PROTO8
 130 #define RTS_ALLFIBS     -1
 131
 132 static struct {
 133         int     ip_count;       /* attached w/ AF_INET */
 134         int     ip6_count;      /* attached w/ AF_INET6 */
 135         int     ipx_count;      /* attached w/ AF_IPX */
 136         int     any_count;      /* total attached */
 137 } route_cb;
 138
 139 struct mtx rtsock_mtx;
 140 MTX_SYSINIT(rtsock, &rtsock_mtx, "rtsock route_cb lock", MTX_DEF);
 141
 142 #define RTSOCK_LOCK()   mtx_lock(&rtsock_mtx)
 143 #define RTSOCK_UNLOCK() mtx_unlock(&rtsock_mtx)
 144 #define RTSOCK_LOCK_ASSERT()    mtx_assert(&rtsock_mtx, MA_OWNED)
 145
 146 SYSCTL_NODE(_net, OID_AUTO, route, CTLFLAG_RD, 0, "");
 147
 148 struct walkarg {
 149         int     w_tmemsize;
 150         int     w_op, w_arg;
 151         caddr_t w_tmem;
 152         struct sysctl_req *w_req;
 153 };
 154
 155 static void     rts_input(struct mbuf *m);
 156 static struct mbuf *rt_msg1(int type, struct rt_addrinfo *rtinfo);
 157 static int      rt_msg2(int type, struct rt_addrinfo *rtinfo,
 158                         caddr_t cp, struct walkarg *w);
 159 static int      rt_xaddrs(caddr_t cp, caddr_t cplim,
 160                         struct rt_addrinfo *rtinfo);
 161 static int      sysctl_dumpentry(struct radix_node *rn, void *vw);
 162 static int      sysctl_iflist(int af, struct walkarg *w);
 163 static int      sysctl_ifmalist(int af, struct walkarg *w);
 164 static int      route_output(struct mbuf *m, struct socket *so);
 165 static void     rt_setmetrics(u_long which, const struct rt_metrics *in,
 166                         struct rt_metrics_lite *out);
 167 static void     rt_getmetrics(const struct rt_metrics_lite *in,
 168                         struct rt_metrics *out);
 169 static void     rt_dispatch(struct mbuf *, const struct sockaddr *);
 170
 171 static struct netisr_handler rtsock_nh = {
 172         .nh_name = "rtsock",
 173         .nh_handler = rts_input,
 174         .nh_proto = NETISR_ROUTE,
 175         .nh_policy = NETISR_POLICY_SOURCE,
 176 };
 177
 178 static int
 179 sysctl_route_netisr_maxqlen(SYSCTL_HANDLER_ARGS)
 180 {
 181         int error, qlimit;
 182
 183         netisr_getqlimit(&rtsock_nh, &qlimit);
 184         error = sysctl_handle_int(oidp, &qlimit, 0, req);
 185         if (error || !req->newptr)
 186                 return (error);
 187         if (qlimit < 1)
 188                 return (EINVAL);
 189         return (netisr_setqlimit(&rtsock_nh, qlimit));
 190 }
 191 SYSCTL_PROC(_net_route, OID_AUTO, netisr_maxqlen, CTLTYPE_INT|CTLFLAG_RW,
 192     0, 0, sysctl_route_netisr_maxqlen, "I",
 193     "maximum routing socket dispatch queue length");
 194
 195 static void
 196 rts_init(void)
 197 {
 198         int tmp;
 199
 200         if (TUNABLE_INT_FETCH("net.route.netisr_maxqlen", &tmp))
 201                 rtsock_nh.nh_qlimit = tmp;
 202         netisr_register(&rtsock_nh);
 203 }
 204 SYSINIT(rtsock, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, rts_init, 0);
 205
 206 static int
 207 raw_input_rts_cb(struct mbuf *m, struct sockproto *proto, struct sockaddr *src,
 208     struct rawcb *rp)
 209 {
 210         int fibnum;
 211
 212         KASSERT(m != NULL, ("%s: m is NULL", __func__));
 213         KASSERT(proto != NULL, ("%s: proto is NULL", __func__));
 214         KASSERT(rp != NULL, ("%s: rp is NULL", __func__));
 215
 216         /* No filtering requested. */
 217         if ((m->m_flags & RTS_FILTER_FIB) == 0)
 218                 return (0);
 219
 220         /* Check if it is a rts and the fib matches the one of the socket. */
 221         fibnum = M_GETFIB(m);
 222         if (proto->sp_family != PF_ROUTE ||
 223             rp->rcb_socket == NULL ||
 224             rp->rcb_socket->so_fibnum == fibnum)
 225                 return (0);
 226
 227         /* Filtering requested and no match, the socket shall be skipped. */
 228         return (1);
 229 }
 230
 231 static void
 232 rts_input(struct mbuf *m)
 233 {
 234         struct sockproto route_proto;
 235         unsigned short *family;
 236         struct m_tag *tag;
 237
 238         route_proto.sp_family = PF_ROUTE;
 239         tag = m_tag_find(m, PACKET_TAG_RTSOCKFAM, NULL);
 240         if (tag != NULL) {
 241                 family = (unsigned short *)(tag + 1);
 242                 route_proto.sp_protocol = *family;
 243                 m_tag_delete(m, tag);
 244         } else
 245                 route_proto.sp_protocol = 0;
 246
 247         raw_input_ext(m, &route_proto, &route_src, raw_input_rts_cb);
 248 }
 249
 250 /*
 251  * It really doesn't make any sense at all for this code to share much
 252  * with raw_usrreq.c, since its functionality is so restricted.  XXX
 253  */
 254 static void
 255 rts_abort(struct socket *so)
 256 {
 257
 258         raw_usrreqs.pru_abort(so);
 259 }
 260
 261 static void
 262 rts_close(struct socket *so)
 263 {
 264
 265         raw_usrreqs.pru_close(so);
 266 }
 267
 268 /* pru_accept is EOPNOTSUPP */
 269
 270 static int
 271 rts_attach(struct socket *so, int proto, struct thread *td)
 272 {
 273         struct rawcb *rp;
 274         int s, error;
 275
 276         KASSERT(so->so_pcb == NULL, ("rts_attach: so_pcb != NULL"));
 277
 278         /* XXX */
 279         rp = malloc(sizeof *rp, M_PCB, M_WAITOK | M_ZERO);
 280         if (rp == NULL)
 281                 return ENOBUFS;
 282
 283         /*
 284          * The splnet() is necessary to block protocols from sending
 285          * error notifications (like RTM_REDIRECT or RTM_LOSING) while
 286          * this PCB is extant but incompletely initialized.
 287          * Probably we should try to do more of this work beforehand and
 288          * eliminate the spl.
 289          */
 290         s = splnet();
 291         so->so_pcb = (caddr_t)rp;
 292         so->so_fibnum = td->td_proc->p_fibnum;
 293         error = raw_attach(so, proto);
 294         rp = sotorawcb(so);
 295         if (error) {
 296                 splx(s);
 297                 so->so_pcb = NULL;
 298                 free(rp, M_PCB);
 299                 return error;
 300         }
 301         RTSOCK_LOCK();
 302         switch(rp->rcb_proto.sp_protocol) {
 303         case AF_INET:
 304                 route_cb.ip_count++;
 305                 break;
 306         case AF_INET6:
 307                 route_cb.ip6_count++;
 308                 break;
 309         case AF_IPX:
 310                 route_cb.ipx_count++;
 311                 break;
 312         }
 313         route_cb.any_count++;
 314         RTSOCK_UNLOCK();
 315         soisconnected(so);
 316         so->so_options |= SO_USELOOPBACK;
 317         splx(s);
 318         return 0;
 319 }
 320
 321 static int
 322 rts_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 323 {
 324
 325         return (raw_usrreqs.pru_bind(so, nam, td)); /* xxx just EINVAL */
 326 }
 327
 328 static int
 329 rts_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 330 {
 331
 332         return (raw_usrreqs.pru_connect(so, nam, td)); /* XXX just EINVAL */
 333 }
 334
 335 /* pru_connect2 is EOPNOTSUPP */
 336 /* pru_control is EOPNOTSUPP */
 337
 338 static void
 339 rts_detach(struct socket *so)
 340 {
 341         struct rawcb *rp = sotorawcb(so);
 342
 343         KASSERT(rp != NULL, ("rts_detach: rp == NULL"));
 344
 345         RTSOCK_LOCK();
 346         switch(rp->rcb_proto.sp_protocol) {
 347         case AF_INET:
 348                 route_cb.ip_count--;
 349                 break;
 350         case AF_INET6:
 351                 route_cb.ip6_count--;
 352                 break;
 353         case AF_IPX:
 354                 route_cb.ipx_count--;
 355                 break;
 356         }
 357         route_cb.any_count--;
 358         RTSOCK_UNLOCK();
 359         raw_usrreqs.pru_detach(so);
 360 }
 361
 362 static int
 363 rts_disconnect(struct socket *so)
 364 {
 365
 366         return (raw_usrreqs.pru_disconnect(so));
 367 }
 368
 369 /* pru_listen is EOPNOTSUPP */
 370
 371 static int
 372 rts_peeraddr(struct socket *so, struct sockaddr **nam)
 373 {
 374
 375         return (raw_usrreqs.pru_peeraddr(so, nam));
 376 }
 377
 378 /* pru_rcvd is EOPNOTSUPP */
 379 /* pru_rcvoob is EOPNOTSUPP */
 380
 381 static int
 382 rts_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
 383          struct mbuf *control, struct thread *td)
 384 {
 385
 386         return (raw_usrreqs.pru_send(so, flags, m, nam, control, td));
 387 }
 388
 389 /* pru_sense is null */
 390
 391 static int
 392 rts_shutdown(struct socket *so)
 393 {
 394
 395         return (raw_usrreqs.pru_shutdown(so));
 396 }
 397
 398 static int
 399 rts_sockaddr(struct socket *so, struct sockaddr **nam)
 400 {
 401
 402         return (raw_usrreqs.pru_sockaddr(so, nam));
 403 }
 404
 405 static struct pr_usrreqs route_usrreqs = {
 406         .pru_abort =            rts_abort,
 407         .pru_attach =           rts_attach,
 408         .pru_bind =             rts_bind,
 409         .pru_connect =          rts_connect,
 410         .pru_detach =           rts_detach,
 411         .pru_disconnect =       rts_disconnect,
 412         .pru_peeraddr =         rts_peeraddr,
 413         .pru_send =             rts_send,
 414         .pru_shutdown =         rts_shutdown,
 415         .pru_sockaddr =         rts_sockaddr,
 416         .pru_close =            rts_close,
 417 };
 418
 419 #ifndef _SOCKADDR_UNION_DEFINED
 420 #define _SOCKADDR_UNION_DEFINED
 421 /*
 422  * The union of all possible address formats we handle.
 423  */
 424 union sockaddr_union {
 425         struct sockaddr         sa;
 426         struct sockaddr_in      sin;
 427         struct sockaddr_in6     sin6;
 428 };
 429 #endif /* _SOCKADDR_UNION_DEFINED */
 430
 431 static int
 432 rtm_get_jailed(struct rt_addrinfo *info, struct ifnet *ifp,
 433     struct rtentry *rt, union sockaddr_union *saun, struct ucred *cred)
 434 {
 435
 436         /* First, see if the returned address is part of the jail. */
 437         if (prison_if(cred, rt->rt_ifa->ifa_addr) == 0) {
 438                 info->rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
 439                 return (0);
 440         }
 441
 442         switch (info->rti_info[RTAX_DST]->sa_family) {
 443 #ifdef INET
 444         case AF_INET:
 445         {
 446                 struct in_addr ia;
 447                 struct ifaddr *ifa;
 448                 int found;
 449
 450                 found = 0;
 451                 /*
 452                  * Try to find an address on the given outgoing interface
 453                  * that belongs to the jail.
 454                  */
 455                 IF_ADDR_LOCK(ifp);
 456                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 457                         struct sockaddr *sa;
 458                         sa = ifa->ifa_addr;
 459                         if (sa->sa_family != AF_INET)
 460                                 continue;
 461                         ia = ((struct sockaddr_in *)sa)->sin_addr;
 462                         if (prison_check_ip4(cred, &ia) == 0) {
 463                                 found = 1;
 464                                 break;
 465                         }
 466                 }
 467                 IF_ADDR_UNLOCK(ifp);
 468                 if (!found) {
 469                         /*
 470                          * As a last resort return the 'default' jail address.
 471                          */
 472                         ia = ((struct sockaddr_in *)rt->rt_ifa->ifa_addr)->
 473                             sin_addr;
 474                         if (prison_get_ip4(cred, &ia) != 0)
 475                                 return (ESRCH);
 476                 }
 477                 bzero(&saun->sin, sizeof(struct sockaddr_in));
 478                 saun->sin.sin_len = sizeof(struct sockaddr_in);
 479                 saun->sin.sin_family = AF_INET;
 480                 saun->sin.sin_addr.s_addr = ia.s_addr;
 481                 info->rti_info[RTAX_IFA] = (struct sockaddr *)&saun->sin;
 482                 break;
 483         }
 484 #endif
 485 #ifdef INET6
 486         case AF_INET6:
 487         {
 488                 struct in6_addr ia6;
 489                 struct ifaddr *ifa;
 490                 int found;
 491
 492                 found = 0;
 493                 /*
 494                  * Try to find an address on the given outgoing interface
 495                  * that belongs to the jail.
 496                  */
 497                 IF_ADDR_LOCK(ifp);
 498                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 499                         struct sockaddr *sa;
 500                         sa = ifa->ifa_addr;
 501                         if (sa->sa_family != AF_INET6)
 502                                 continue;
 503                         bcopy(&((struct sockaddr_in6 *)sa)->sin6_addr,
 504                             &ia6, sizeof(struct in6_addr));
 505                         if (prison_check_ip6(cred, &ia6) == 0) {
 506                                 found = 1;
 507                                 break;
 508                         }
 509                 }
 510                 IF_ADDR_UNLOCK(ifp);
 511                 if (!found) {
 512                         /*
 513                          * As a last resort return the 'default' jail address.
 514                          */
 515                         ia6 = ((struct sockaddr_in6 *)rt->rt_ifa->ifa_addr)->
 516                             sin6_addr;
 517                         if (prison_get_ip6(cred, &ia6) != 0)
 518                                 return (ESRCH);
 519                 }
 520                 bzero(&saun->sin6, sizeof(struct sockaddr_in6));
 521                 saun->sin6.sin6_len = sizeof(struct sockaddr_in6);
 522                 saun->sin6.sin6_family = AF_INET6;
 523                 bcopy(&ia6, &saun->sin6.sin6_addr, sizeof(struct in6_addr));
 524                 if (sa6_recoverscope(&saun->sin6) != 0)
 525                         return (ESRCH);
 526                 info->rti_info[RTAX_IFA] = (struct sockaddr *)&saun->sin6;
 527                 break;
 528         }
 529 #endif
 530         default:
 531                 return (ESRCH);
 532         }
 533         return (0);
 534 }
 535
 536 /*ARGSUSED*/
 537 static int
 538 route_output(struct mbuf *m, struct socket *so)
 539 {
 540 #define sa_equal(a1, a2) (bcmp((a1), (a2), (a1)->sa_len) == 0)
 541         struct rt_msghdr *rtm = NULL;
 542         struct rtentry *rt = NULL;
 543         struct radix_node_head *rnh;
 544         struct rt_addrinfo info;
 545         int len, error = 0;
 546         struct ifnet *ifp = NULL;
 547         union sockaddr_union saun;
 548
 549 #define senderr(e) { error = e; goto flush;}
 550         if (m == NULL || ((m->m_len < sizeof(long)) &&
 551                        (m = m_pullup(m, sizeof(long))) == NULL))
 552                 return (ENOBUFS);
 553         if ((m->m_flags & M_PKTHDR) == 0)
 554                 panic("route_output");
 555         len = m->m_pkthdr.len;
 556         if (len < sizeof(*rtm) ||
 557             len != mtod(m, struct rt_msghdr *)->rtm_msglen) {
 558                 info.rti_info[RTAX_DST] = NULL;
 559                 senderr(EINVAL);
 560         }
 561         R_Malloc(rtm, struct rt_msghdr *, len);
 562         if (rtm == NULL) {
 563                 info.rti_info[RTAX_DST] = NULL;
 564                 senderr(ENOBUFS);
 565         }
 566         m_copydata(m, 0, len, (caddr_t)rtm);
 567         if (rtm->rtm_version != RTM_VERSION) {
 568                 info.rti_info[RTAX_DST] = NULL;
 569                 senderr(EPROTONOSUPPORT);
 570         }
 571         rtm->rtm_pid = curproc->p_pid;
 572         bzero(&info, sizeof(info));
 573         info.rti_addrs = rtm->rtm_addrs;
 574         if (rt_xaddrs((caddr_t)(rtm + 1), len + (caddr_t)rtm, &info)) {
 575                 info.rti_info[RTAX_DST] = NULL;
 576                 senderr(EINVAL);
 577         }
 578         info.rti_flags = rtm->rtm_flags;
 579         if (info.rti_info[RTAX_DST] == NULL ||
 580             info.rti_info[RTAX_DST]->sa_family >= AF_MAX ||
 581             (info.rti_info[RTAX_GATEWAY] != NULL &&
 582              info.rti_info[RTAX_GATEWAY]->sa_family >= AF_MAX))
 583                 senderr(EINVAL);
 584         /*
 585          * Verify that the caller has the appropriate privilege; RTM_GET
 586          * is the only operation the non-superuser is allowed.
 587          */
 588         if (rtm->rtm_type != RTM_GET) {
 589                 error = priv_check(curthread, PRIV_NET_ROUTE);
 590                 if (error)
 591                         senderr(error);
 592         }
 593
 594         /*
 595          * The given gateway address may be an interface address.
 596          * For example, issuing a "route change" command on a route
 597          * entry that was created from a tunnel, and the gateway
 598          * address given is the local end point. In this case the
 599          * RTF_GATEWAY flag must be cleared or the destination will
 600          * not be reachable even though there is no error message.
 601          */
 602         if (info.rti_info[RTAX_GATEWAY] != NULL &&
 603             info.rti_info[RTAX_GATEWAY]->sa_family != AF_LINK) {
 604                 struct route gw_ro;
 605
 606                 bzero(&gw_ro, sizeof(gw_ro));
 607                 gw_ro.ro_dst = *info.rti_info[RTAX_GATEWAY];
 608                 rtalloc_ign_fib(&gw_ro, 0, so->so_fibnum);
 609                 /*
 610                  * A host route through the loopback interface is
 611                  * installed for each interface adddress. In pre 8.0
 612                  * releases the interface address of a PPP link type
 613                  * is not reachable locally. This behavior is fixed as
 614                  * part of the new L2/L3 redesign and rewrite work. The
 615                  * signature of this interface address route is the
 616                  * AF_LINK sa_family type of the rt_gateway, and the
 617                  * rt_ifp has the IFF_LOOPBACK flag set.
 618                  */
 619                 if (gw_ro.ro_rt != NULL &&
 620                     gw_ro.ro_rt->rt_gateway->sa_family == AF_LINK &&
 621                     gw_ro.ro_rt->rt_ifp->if_flags & IFF_LOOPBACK)
 622                         info.rti_flags &= ~RTF_GATEWAY;
 623                 if (gw_ro.ro_rt != NULL)
 624                         RTFREE(gw_ro.ro_rt);
 625         }
 626
 627         switch (rtm->rtm_type) {
 628                 struct rtentry *saved_nrt;
 629
 630         case RTM_ADD:
 631                 if (info.rti_info[RTAX_GATEWAY] == NULL)
 632                         senderr(EINVAL);
 633                 saved_nrt = NULL;
 634
 635                 /* support for new ARP code */
 636                 if (info.rti_info[RTAX_GATEWAY]->sa_family == AF_LINK &&
 637                     (rtm->rtm_flags & RTF_LLDATA) != 0) {
 638                         error = lla_rt_output(rtm, &info);
 639                         break;
 640                 }
 641                 error = rtrequest1_fib(RTM_ADD, &info, &saved_nrt,
 642                     so->so_fibnum);
 643                 if (error == 0 && saved_nrt) {
 644                         RT_LOCK(saved_nrt);
 645                         rt_setmetrics(rtm->rtm_inits,
 646                                 &rtm->rtm_rmx, &saved_nrt->rt_rmx);
 647                         rtm->rtm_index = saved_nrt->rt_ifp->if_index;
 648                         RT_REMREF(saved_nrt);
 649                         RT_UNLOCK(saved_nrt);
 650                 }
 651                 break;
 652
 653         case RTM_DELETE:
 654                 saved_nrt = NULL;
 655                 /* support for new ARP code */
 656                 if (info.rti_info[RTAX_GATEWAY] &&
 657                     (info.rti_info[RTAX_GATEWAY]->sa_family == AF_LINK) &&
 658                     (rtm->rtm_flags & RTF_LLDATA) != 0) {
 659                         error = lla_rt_output(rtm, &info);
 660                         break;
 661                 }
 662                 error = rtrequest1_fib(RTM_DELETE, &info, &saved_nrt,
 663                     so->so_fibnum);
 664                 if (error == 0) {
 665                         RT_LOCK(saved_nrt);
 666                         rt = saved_nrt;
 667                         goto report;
 668                 }
 669                 break;
 670
 671         case RTM_GET:
 672         case RTM_CHANGE:
 673         case RTM_LOCK:
 674                 rnh = rt_tables_get_rnh(so->so_fibnum,
 675                     info.rti_info[RTAX_DST]->sa_family);
 676                 if (rnh == NULL)
 677                         senderr(EAFNOSUPPORT);
 678                 RADIX_NODE_HEAD_RLOCK(rnh);
 679                 rt = (struct rtentry *) rnh->rnh_lookup(info.rti_info[RTAX_DST],
 680                         info.rti_info[RTAX_NETMASK], rnh);
 681                 if (rt == NULL) {       /* XXX looks bogus */
 682                         RADIX_NODE_HEAD_RUNLOCK(rnh);
 683                         senderr(ESRCH);
 684                 }
 685 #ifdef RADIX_MPATH
 686                 /*
 687                  * for RTM_CHANGE/LOCK, if we got multipath routes,
 688                  * we require users to specify a matching RTAX_GATEWAY.
 689                  *
 690                  * for RTM_GET, gate is optional even with multipath.
 691                  * if gate == NULL the first match is returned.
 692                  * (no need to call rt_mpath_matchgate if gate == NULL)
 693                  */
 694                 if (rn_mpath_capable(rnh) &&
 695                     (rtm->rtm_type != RTM_GET || info.rti_info[RTAX_GATEWAY])) {
 696                         rt = rt_mpath_matchgate(rt, info.rti_info[RTAX_GATEWAY]);
 697                         if (!rt) {
 698                                 RADIX_NODE_HEAD_RUNLOCK(rnh);
 699                                 senderr(ESRCH);
 700                         }
 701                 }
 702 #endif
 703                 /*
 704                  * If performing proxied L2 entry insertion, and
 705                  * the actual PPP host entry is found, perform
 706                  * another search to retrieve the prefix route of
 707                  * the local end point of the PPP link.
 708                  */
 709                 if (rtm->rtm_flags & RTF_ANNOUNCE) {
 710                         struct sockaddr laddr;
 711
 712                         if (rt->rt_ifp != NULL &&
 713                             rt->rt_ifp->if_type == IFT_PROPVIRTUAL) {
 714                                 struct ifaddr *ifa;
 715
 716                                 ifa = ifa_ifwithnet(info.rti_info[RTAX_DST], 1);
 717                                 if (ifa != NULL)
 718                                         rt_maskedcopy(ifa->ifa_addr,
 719                                                       &laddr,
 720                                                       ifa->ifa_netmask);
 721                         } else
 722                                 rt_maskedcopy(rt->rt_ifa->ifa_addr,
 723                                               &laddr,
 724                                               rt->rt_ifa->ifa_netmask);
 725                         /*
 726                          * refactor rt and no lock operation necessary
 727                          */
 728                         rt = (struct rtentry *)rnh->rnh_matchaddr(&laddr, rnh);
 729                         if (rt == NULL) {
 730                                 RADIX_NODE_HEAD_RUNLOCK(rnh);
 731                                 senderr(ESRCH);
 732                         }
 733                 }
 734                 RT_LOCK(rt);
 735                 RT_ADDREF(rt);
 736                 RADIX_NODE_HEAD_RUNLOCK(rnh);
 737
 738                 /*
 739                  * Fix for PR: 82974
 740                  *
 741                  * RTM_CHANGE/LOCK need a perfect match, rn_lookup()
 742                  * returns a perfect match in case a netmask is
 743                  * specified.  For host routes only a longest prefix
 744                  * match is returned so it is necessary to compare the
 745                  * existence of the netmask.  If both have a netmask
 746                  * rnh_lookup() did a perfect match and if none of them
 747                  * have a netmask both are host routes which is also a
 748                  * perfect match.
 749                  */
 750
 751                 if (rtm->rtm_type != RTM_GET &&
 752                     (!rt_mask(rt) != !info.rti_info[RTAX_NETMASK])) {
 753                         RT_UNLOCK(rt);
 754                         senderr(ESRCH);
 755                 }
 756
 757                 switch(rtm->rtm_type) {
 758
 759                 case RTM_GET:
 760                 report:
 761                         RT_LOCK_ASSERT(rt);
 762                         if ((rt->rt_flags & RTF_HOST) == 0
 763                             ? jailed_without_vnet(curthread->td_ucred)
 764                             : prison_if(curthread->td_ucred,
 765                             rt_key(rt)) != 0) {
 766                                 RT_UNLOCK(rt);
 767                                 senderr(ESRCH);
 768                         }
 769                         info.rti_info[RTAX_DST] = rt_key(rt);
 770                         info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
 771                         info.rti_info[RTAX_NETMASK] = rt_mask(rt);
 772                         info.rti_info[RTAX_GENMASK] = 0;
 773                         if (rtm->rtm_addrs & (RTA_IFP | RTA_IFA)) {
 774                                 ifp = rt->rt_ifp;
 775                                 if (ifp) {
 776                                         info.rti_info[RTAX_IFP] =
 777                                             ifp->if_addr->ifa_addr;
 778                                         error = rtm_get_jailed(&info, ifp, rt,
 779                                             &saun, curthread->td_ucred);
 780                                         if (error != 0) {
 781                                                 RT_UNLOCK(rt);
 782                                                 senderr(error);
 783                                         }
 784                                         if (ifp->if_flags & IFF_POINTOPOINT)
 785                                                 info.rti_info[RTAX_BRD] =
 786                                                     rt->rt_ifa->ifa_dstaddr;
 787                                         rtm->rtm_index = ifp->if_index;
 788                                 } else {
 789                                         info.rti_info[RTAX_IFP] = NULL;
 790                                         info.rti_info[RTAX_IFA] = NULL;
 791                                 }
 792                         } else if ((ifp = rt->rt_ifp) != NULL) {
 793                                 rtm->rtm_index = ifp->if_index;
 794                         }
 795                         len = rt_msg2(rtm->rtm_type, &info, NULL, NULL);
 796                         if (len > rtm->rtm_msglen) {
 797                                 struct rt_msghdr *new_rtm;
 798                                 R_Malloc(new_rtm, struct rt_msghdr *, len);
 799                                 if (new_rtm == NULL) {
 800                                         RT_UNLOCK(rt);
 801                                         senderr(ENOBUFS);
 802                                 }
 803                                 bcopy(rtm, new_rtm, rtm->rtm_msglen);
 804                                 Free(rtm); rtm = new_rtm;
 805                         }
 806                         (void)rt_msg2(rtm->rtm_type, &info, (caddr_t)rtm, NULL);
 807                         rtm->rtm_flags = rt->rt_flags;
 808                         rt_getmetrics(&rt->rt_rmx, &rtm->rtm_rmx);
 809                         rtm->rtm_addrs = info.rti_addrs;
 810                         break;
 811
 812                 case RTM_CHANGE:
 813                         /*
 814                          * New gateway could require new ifaddr, ifp;
 815                          * flags may also be different; ifp may be specified
 816                          * by ll sockaddr when protocol address is ambiguous
 817                          */
 818                         if (((rt->rt_flags & RTF_GATEWAY) &&
 819                              info.rti_info[RTAX_GATEWAY] != NULL) ||
 820                             info.rti_info[RTAX_IFP] != NULL ||
 821                             (info.rti_info[RTAX_IFA] != NULL &&
 822                              !sa_equal(info.rti_info[RTAX_IFA],
 823                                        rt->rt_ifa->ifa_addr))) {
 824                                 RT_UNLOCK(rt);
 825                                 RADIX_NODE_HEAD_LOCK(rnh);
 826                                 error = rt_getifa_fib(&info, rt->rt_fibnum);
 827                                 /*
 828                                  * XXXRW: Really we should release this
 829                                  * reference later, but this maintains
 830                                  * historical behavior.
 831                                  */
 832                                 if (info.rti_ifa != NULL)
 833                                         ifa_free(info.rti_ifa);
 834                                 RADIX_NODE_HEAD_UNLOCK(rnh);
 835                                 if (error != 0)
 836                                         senderr(error);
 837                                 RT_LOCK(rt);
 838                         }
 839                         if (info.rti_ifa != NULL &&
 840                             info.rti_ifa != rt->rt_ifa &&
 841                             rt->rt_ifa != NULL &&
 842                             rt->rt_ifa->ifa_rtrequest != NULL) {
 843                                 rt->rt_ifa->ifa_rtrequest(RTM_DELETE, rt,
 844                                     &info);
 845                                 ifa_free(rt->rt_ifa);
 846                         }
 847                         if (info.rti_info[RTAX_GATEWAY] != NULL) {
 848                                 RT_UNLOCK(rt);
 849                                 RADIX_NODE_HEAD_LOCK(rnh);
 850                                 RT_LOCK(rt);
 851
 852                                 error = rt_setgate(rt, rt_key(rt),
 853                                     info.rti_info[RTAX_GATEWAY]);
 854                                 RADIX_NODE_HEAD_UNLOCK(rnh);
 855                                 if (error != 0) {
 856                                         RT_UNLOCK(rt);
 857                                         senderr(error);
 858                                 }
 859                                 rt->rt_flags |= (RTF_GATEWAY & info.rti_flags);
 860                         }
 861                         if (info.rti_ifa != NULL &&
 862                             info.rti_ifa != rt->rt_ifa) {
 863                                 ifa_ref(info.rti_ifa);
 864                                 rt->rt_ifa = info.rti_ifa;
 865                                 rt->rt_ifp = info.rti_ifp;
 866                         }
 867                         /* Allow some flags to be toggled on change. */
 868                         rt->rt_flags = (rt->rt_flags & ~RTF_FMASK) |
 869                                     (rtm->rtm_flags & RTF_FMASK);
 870                         rt_setmetrics(rtm->rtm_inits, &rtm->rtm_rmx,
 871                                         &rt->rt_rmx);
 872                         rtm->rtm_index = rt->rt_ifp->if_index;
 873                         if (rt->rt_ifa && rt->rt_ifa->ifa_rtrequest)
 874                                rt->rt_ifa->ifa_rtrequest(RTM_ADD, rt, &info);
 875                         /* FALLTHROUGH */
 876                 case RTM_LOCK:
 877                         /* We don't support locks anymore */
 878                         break;
 879                 }
 880                 RT_UNLOCK(rt);
 881                 break;
 882
 883         default:
 884                 senderr(EOPNOTSUPP);
 885         }
 886
 887 flush:
 888         if (rtm) {
 889                 if (error)
 890                         rtm->rtm_errno = error;
 891                 else
 892                         rtm->rtm_flags |= RTF_DONE;
 893         }
 894         if (rt)         /* XXX can this be true? */
 895                 RTFREE(rt);
 896     {
 897         struct rawcb *rp = NULL;
 898         /*
 899          * Check to see if we don't want our own messages.
 900          */
 901         if ((so->so_options & SO_USELOOPBACK) == 0) {
 902                 if (route_cb.any_count <= 1) {
 903                         if (rtm)
 904                                 Free(rtm);
 905                         m_freem(m);
 906                         return (error);
 907                 }
 908                 /* There is another listener, so construct message */
 909                 rp = sotorawcb(so);
 910         }
 911         if (rtm) {
 912                 m_copyback(m, 0, rtm->rtm_msglen, (caddr_t)rtm);
 913                 if (m->m_pkthdr.len < rtm->rtm_msglen) {
 914                         m_freem(m);
 915                         m = NULL;
 916                 } else if (m->m_pkthdr.len > rtm->rtm_msglen)
 917                         m_adj(m, rtm->rtm_msglen - m->m_pkthdr.len);
 918         }
 919         if (m) {
 920                 M_SETFIB(m, so->so_fibnum);
 921                 m->m_flags |= RTS_FILTER_FIB;
 922                 if (rp) {
 923                         /*
 924                          * XXX insure we don't get a copy by
 925                          * invalidating our protocol
 926                          */
 927                         unsigned short family = rp->rcb_proto.sp_family;
 928                         rp->rcb_proto.sp_family = 0;
 929                         rt_dispatch(m, info.rti_info[RTAX_DST]);
 930                         rp->rcb_proto.sp_family = family;
 931                 } else
 932                         rt_dispatch(m, info.rti_info[RTAX_DST]);
 933         }
 934         /* info.rti_info[RTAX_DST] (used above) can point inside of rtm */
 935         if (rtm)
 936                 Free(rtm);
 937     }
 938         return (error);
 939 #undef  sa_equal
 940 }
 941
 942 static void
 943 rt_setmetrics(u_long which, const struct rt_metrics *in,
 944         struct rt_metrics_lite *out)
 945 {
 946 #define metric(f, e) if (which & (f)) out->e = in->e;
 947         /*
 948          * Only these are stored in the routing entry since introduction
 949          * of tcp hostcache. The rest is ignored.
 950          */
 951         metric(RTV_MTU, rmx_mtu);
 952         metric(RTV_WEIGHT, rmx_weight);
 953         /* Userland -> kernel timebase conversion. */
 954         if (which & RTV_EXPIRE)
 955                 out->rmx_expire = in->rmx_expire ?
 956                     in->rmx_expire - time_second + time_uptime : 0;
 957 #undef metric
 958 }
 959
 960 static void
 961 rt_getmetrics(const struct rt_metrics_lite *in, struct rt_metrics *out)
 962 {
 963 #define metric(e) out->e = in->e;
 964         bzero(out, sizeof(*out));
 965         metric(rmx_mtu);
 966         metric(rmx_weight);
 967         /* Kernel -> userland timebase conversion. */
 968         out->rmx_expire = in->rmx_expire ?
 969             in->rmx_expire - time_uptime + time_second : 0;
 970 #undef metric
 971 }
 972
 973 /*
 974  * Extract the addresses of the passed sockaddrs.
 975  * Do a little sanity checking so as to avoid bad memory references.
 976  * This data is derived straight from userland.
 977  */
 978 static int
 979 rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo)
 980 {
 981         struct sockaddr *sa;
 982         int i;
 983
 984         for (i = 0; i < RTAX_MAX && cp < cplim; i++) {
 985                 if ((rtinfo->rti_addrs & (1 << i)) == 0)
 986                         continue;
 987                 sa = (struct sockaddr *)cp;
 988                 /*
 989                  * It won't fit.
 990                  */
 991                 if (cp + sa->sa_len > cplim)
 992                         return (EINVAL);
 993                 /*
 994                  * there are no more.. quit now
 995                  * If there are more bits, they are in error.
 996                  * I've seen this. route(1) can evidently generate these.
 997                  * This causes kernel to core dump.
 998                  * for compatibility, If we see this, point to a safe address.
 999                  */
1000                 if (sa->sa_len == 0) {
1001                         rtinfo->rti_info[i] = &sa_zero;
1002                         return (0); /* should be EINVAL but for compat */
1003                 }
1004                 /* accept it */
1005                 rtinfo->rti_info[i] = sa;
1006                 cp += SA_SIZE(sa);
1007         }
1008         return (0);
1009 }
1010
1011 static struct mbuf *
1012 rt_msg1(int type, struct rt_addrinfo *rtinfo)
1013 {
1014         struct rt_msghdr *rtm;
1015         struct mbuf *m;
1016         int i;
1017         struct sockaddr *sa;
1018         int len, dlen;
1019
1020         switch (type) {
1021
1022         case RTM_DELADDR:
1023         case RTM_NEWADDR:
1024                 len = sizeof(struct ifa_msghdr);
1025                 break;
1026
1027         case RTM_DELMADDR:
1028         case RTM_NEWMADDR:
1029                 len = sizeof(struct ifma_msghdr);
1030                 break;
1031
1032         case RTM_IFINFO:
1033                 len = sizeof(struct if_msghdr);
1034                 break;
1035
1036         case RTM_IFANNOUNCE:
1037         case RTM_IEEE80211:
1038                 len = sizeof(struct if_announcemsghdr);
1039                 break;
1040
1041         default:
1042                 len = sizeof(struct rt_msghdr);
1043         }
1044         if (len > MCLBYTES)
1045                 panic("rt_msg1");
1046         m = m_gethdr(M_DONTWAIT, MT_DATA);
1047         if (m && len > MHLEN) {
1048                 MCLGET(m, M_DONTWAIT);
1049                 if ((m->m_flags & M_EXT) == 0) {
1050                         m_free(m);
1051                         m = NULL;
1052                 }
1053         }
1054         if (m == NULL)
1055                 return (m);
1056         m->m_pkthdr.len = m->m_len = len;
1057         m->m_pkthdr.rcvif = NULL;
1058         rtm = mtod(m, struct rt_msghdr *);
1059         bzero((caddr_t)rtm, len);
1060         for (i = 0; i < RTAX_MAX; i++) {
1061                 if ((sa = rtinfo->rti_info[i]) == NULL)
1062                         continue;
1063                 rtinfo->rti_addrs |= (1 << i);
1064                 dlen = SA_SIZE(sa);
1065                 m_copyback(m, len, dlen, (caddr_t)sa);
1066                 len += dlen;
1067         }
1068         if (m->m_pkthdr.len != len) {
1069                 m_freem(m);
1070                 return (NULL);
1071         }
1072         rtm->rtm_msglen = len;
1073         rtm->rtm_version = RTM_VERSION;
1074         rtm->rtm_type = type;
1075         return (m);
1076 }
1077
1078 static int
1079 rt_msg2(int type, struct rt_addrinfo *rtinfo, caddr_t cp, struct walkarg *w)
1080 {
1081         int i;
1082         int len, dlen, second_time = 0;
1083         caddr_t cp0;
1084
1085         rtinfo->rti_addrs = 0;
1086 again:
1087         switch (type) {
1088
1089         case RTM_DELADDR:
1090         case RTM_NEWADDR:
1091                 len = sizeof(struct ifa_msghdr);
1092                 break;
1093
1094         case RTM_IFINFO:
1095 #ifdef COMPAT_FREEBSD32
1096                 if (w != NULL && w->w_req->flags & SCTL_MASK32) {
1097                         len = sizeof(struct if_msghdr32);
1098                         break;
1099                 }
1100 #endif
1101                 len = sizeof(struct if_msghdr);
1102                 break;
1103
1104         case RTM_NEWMADDR:
1105                 len = sizeof(struct ifma_msghdr);
1106                 break;
1107
1108         default:
1109                 len = sizeof(struct rt_msghdr);
1110         }
1111         cp0 = cp;
1112         if (cp0)
1113                 cp += len;
1114         for (i = 0; i < RTAX_MAX; i++) {
1115                 struct sockaddr *sa;
1116
1117                 if ((sa = rtinfo->rti_info[i]) == NULL)
1118                         continue;
1119                 rtinfo->rti_addrs |= (1 << i);
1120                 dlen = SA_SIZE(sa);
1121                 if (cp) {
1122                         bcopy((caddr_t)sa, cp, (unsigned)dlen);
1123                         cp += dlen;
1124                 }
1125                 len += dlen;
1126         }
1127         len = ALIGN(len);
1128         if (cp == NULL && w != NULL && !second_time) {
1129                 struct walkarg *rw = w;
1130
1131                 if (rw->w_req) {
1132                         if (rw->w_tmemsize < len) {
1133                                 if (rw->w_tmem)
1134                                         free(rw->w_tmem, M_RTABLE);
1135                                 rw->w_tmem = (caddr_t)
1136                                         malloc(len, M_RTABLE, M_NOWAIT);
1137                                 if (rw->w_tmem)
1138                                         rw->w_tmemsize = len;
1139                         }
1140                         if (rw->w_tmem) {
1141                                 cp = rw->w_tmem;
1142                                 second_time = 1;
1143                                 goto again;
1144                         }
1145                 }
1146         }
1147         if (cp) {
1148                 struct rt_msghdr *rtm = (struct rt_msghdr *)cp0;
1149
1150                 rtm->rtm_version = RTM_VERSION;
1151                 rtm->rtm_type = type;
1152                 rtm->rtm_msglen = len;
1153         }
1154         return (len);
1155 }
1156
1157 /*
1158  * This routine is called to generate a message from the routing
1159  * socket indicating that a redirect has occured, a routing lookup
1160  * has failed, or that a protocol has detected timeouts to a particular
1161  * destination.
1162  */
1163 void
1164 rt_missmsg_fib(int type, struct rt_addrinfo *rtinfo, int flags, int error,
1165     int fibnum)
1166 {
1167         struct rt_msghdr *rtm;
1168         struct mbuf *m;
1169         struct sockaddr *sa = rtinfo->rti_info[RTAX_DST];
1170
1171         if (route_cb.any_count == 0)
1172                 return;
1173         m = rt_msg1(type, rtinfo);
1174         if (m == NULL)
1175                 return;
1176
1177         if (fibnum != RTS_ALLFIBS) {
1178                 KASSERT(fibnum >= 0 && fibnum < rt_numfibs, ("%s: fibnum out "
1179                     "of range 0 <= %d < %d", __func__, fibnum, rt_numfibs));
1180                 M_SETFIB(m, fibnum);
1181                 m->m_flags |= RTS_FILTER_FIB;
1182         }
1183
1184         rtm = mtod(m, struct rt_msghdr *);
1185         rtm->rtm_flags = RTF_DONE | flags;
1186         rtm->rtm_errno = error;
1187         rtm->rtm_addrs = rtinfo->rti_addrs;
1188         rt_dispatch(m, sa);
1189 }
1190
1191 void
1192 rt_missmsg(int type, struct rt_addrinfo *rtinfo, int flags, int error)
1193 {
1194
1195         rt_missmsg_fib(type, rtinfo, flags, error, RTS_ALLFIBS);
1196 }
1197
1198 /*
1199  * This routine is called to generate a message from the routing
1200  * socket indicating that the status of a network interface has changed.
1201  */
1202 void
1203 rt_ifmsg(struct ifnet *ifp)
1204 {
1205         struct if_msghdr *ifm;
1206         struct mbuf *m;
1207         struct rt_addrinfo info;
1208
1209         if (route_cb.any_count == 0)
1210                 return;
1211         bzero((caddr_t)&info, sizeof(info));
1212         m = rt_msg1(RTM_IFINFO, &info);
1213         if (m == NULL)
1214                 return;
1215         ifm = mtod(m, struct if_msghdr *);
1216         ifm->ifm_index = ifp->if_index;
1217         ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
1218         ifm->ifm_data = ifp->if_data;
1219         ifm->ifm_addrs = 0;
1220         rt_dispatch(m, NULL);
1221 }
1222
1223 /*
1224  * This is called to generate messages from the routing socket
1225  * indicating a network interface has had addresses associated with it.
1226  * if we ever reverse the logic and replace messages TO the routing
1227  * socket indicate a request to configure interfaces, then it will
1228  * be unnecessary as the routing socket will automatically generate
1229  * copies of it.
1230  */
1231 void
1232 rt_newaddrmsg_fib(int cmd, struct ifaddr *ifa, int error, struct rtentry *rt,
1233     int fibnum)
1234 {
1235         struct rt_addrinfo info;
1236         struct sockaddr *sa = NULL;
1237         int pass;
1238         struct mbuf *m = NULL;
1239         struct ifnet *ifp = ifa->ifa_ifp;
1240
1241         KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE,
1242                 ("unexpected cmd %u", cmd));
1243 #if defined(INET) || defined(INET6)
1244 #ifdef SCTP
1245         /*
1246          * notify the SCTP stack
1247          * this will only get called when an address is added/deleted
1248          * XXX pass the ifaddr struct instead if ifa->ifa_addr...
1249          */
1250         sctp_addr_change(ifa, cmd);
1251 #endif /* SCTP */
1252 #endif
1253         if (route_cb.any_count == 0)
1254                 return;
1255         for (pass = 1; pass < 3; pass++) {
1256                 bzero((caddr_t)&info, sizeof(info));
1257                 if ((cmd == RTM_ADD && pass == 1) ||
1258                     (cmd == RTM_DELETE && pass == 2)) {
1259                         struct ifa_msghdr *ifam;
1260                         int ncmd = cmd == RTM_ADD ? RTM_NEWADDR : RTM_DELADDR;
1261
1262                         info.rti_info[RTAX_IFA] = sa = ifa->ifa_addr;
1263                         info.rti_info[RTAX_IFP] = ifp->if_addr->ifa_addr;
1264                         info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask;
1265                         info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr;
1266                         if ((m = rt_msg1(ncmd, &info)) == NULL)
1267                                 continue;
1268                         ifam = mtod(m, struct ifa_msghdr *);
1269                         ifam->ifam_index = ifp->if_index;
1270                         ifam->ifam_metric = ifa->ifa_metric;
1271                         ifam->ifam_flags = ifa->ifa_flags;
1272                         ifam->ifam_addrs = info.rti_addrs;
1273                 }
1274                 if ((cmd == RTM_ADD && pass == 2) ||
1275                     (cmd == RTM_DELETE && pass == 1)) {
1276                         struct rt_msghdr *rtm;
1277
1278                         if (rt == NULL)
1279                                 continue;
1280                         info.rti_info[RTAX_NETMASK] = rt_mask(rt);
1281                         info.rti_info[RTAX_DST] = sa = rt_key(rt);
1282                         info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
1283                         if ((m = rt_msg1(cmd, &info)) == NULL)
1284                                 continue;
1285                         rtm = mtod(m, struct rt_msghdr *);
1286                         rtm->rtm_index = ifp->if_index;
1287                         rtm->rtm_flags |= rt->rt_flags;
1288                         rtm->rtm_errno = error;
1289                         rtm->rtm_addrs = info.rti_addrs;
1290                 }
1291                 if (fibnum != RTS_ALLFIBS) {
1292                         KASSERT(fibnum >= 0 && fibnum < rt_numfibs, ("%s: "
1293                             "fibnum out of range 0 <= %d < %d", __func__,
1294                              fibnum, rt_numfibs));
1295                         M_SETFIB(m, fibnum);
1296                         m->m_flags |= RTS_FILTER_FIB;
1297                 }
1298                 rt_dispatch(m, sa);
1299         }
1300 }
1301
1302 void
1303 rt_newaddrmsg(int cmd, struct ifaddr *ifa, int error, struct rtentry *rt)
1304 {
1305
1306         rt_newaddrmsg_fib(cmd, ifa, error, rt, RTS_ALLFIBS);
1307 }
1308
1309 /*
1310  * This is the analogue to the rt_newaddrmsg which performs the same
1311  * function but for multicast group memberhips.  This is easier since
1312  * there is no route state to worry about.
1313  */
1314 void
1315 rt_newmaddrmsg(int cmd, struct ifmultiaddr *ifma)
1316 {
1317         struct rt_addrinfo info;
1318         struct mbuf *m = NULL;
1319         struct ifnet *ifp = ifma->ifma_ifp;
1320         struct ifma_msghdr *ifmam;
1321
1322         if (route_cb.any_count == 0)
1323                 return;
1324
1325         bzero((caddr_t)&info, sizeof(info));
1326         info.rti_info[RTAX_IFA] = ifma->ifma_addr;
1327         info.rti_info[RTAX_IFP] = ifp ? ifp->if_addr->ifa_addr : NULL;
1328         /*
1329          * If a link-layer address is present, present it as a ``gateway''
1330          * (similarly to how ARP entries, e.g., are presented).
1331          */
1332         info.rti_info[RTAX_GATEWAY] = ifma->ifma_lladdr;
1333         m = rt_msg1(cmd, &info);
1334         if (m == NULL)
1335                 return;
1336         ifmam = mtod(m, struct ifma_msghdr *);
1337         KASSERT(ifp != NULL, ("%s: link-layer multicast address w/o ifp\n",
1338             __func__));
1339         ifmam->ifmam_index = ifp->if_index;
1340         ifmam->ifmam_addrs = info.rti_addrs;
1341         rt_dispatch(m, ifma->ifma_addr);
1342 }
1343
1344 static struct mbuf *
1345 rt_makeifannouncemsg(struct ifnet *ifp, int type, int what,
1346         struct rt_addrinfo *info)
1347 {
1348         struct if_announcemsghdr *ifan;
1349         struct mbuf *m;
1350
1351         if (route_cb.any_count == 0)
1352                 return NULL;
1353         bzero((caddr_t)info, sizeof(*info));
1354         m = rt_msg1(type, info);
1355         if (m != NULL) {
1356                 ifan = mtod(m, struct if_announcemsghdr *);
1357                 ifan->ifan_index = ifp->if_index;
1358                 strlcpy(ifan->ifan_name, ifp->if_xname,
1359                         sizeof(ifan->ifan_name));
1360                 ifan->ifan_what = what;
1361         }
1362         return m;
1363 }
1364
1365 /*
1366  * This is called to generate routing socket messages indicating
1367  * IEEE80211 wireless events.
1368  * XXX we piggyback on the RTM_IFANNOUNCE msg format in a clumsy way.
1369  */
1370 void
1371 rt_ieee80211msg(struct ifnet *ifp, int what, void *data, size_t data_len)
1372 {
1373         struct mbuf *m;
1374         struct rt_addrinfo info;
1375
1376         m = rt_makeifannouncemsg(ifp, RTM_IEEE80211, what, &info);
1377         if (m != NULL) {
1378                 /*
1379                  * Append the ieee80211 data.  Try to stick it in the
1380                  * mbuf containing the ifannounce msg; otherwise allocate
1381                  * a new mbuf and append.
1382                  *
1383                  * NB: we assume m is a single mbuf.
1384                  */
1385                 if (data_len > M_TRAILINGSPACE(m)) {
1386                         struct mbuf *n = m_get(M_NOWAIT, MT_DATA);
1387                         if (n == NULL) {
1388                                 m_freem(m);
1389                                 return;
1390                         }
1391                         bcopy(data, mtod(n, void *), data_len);
1392                         n->m_len = data_len;
1393                         m->m_next = n;
1394                 } else if (data_len > 0) {
1395                         bcopy(data, mtod(m, u_int8_t *) + m->m_len, data_len);
1396                         m->m_len += data_len;
1397                 }
1398                 if (m->m_flags & M_PKTHDR)
1399                         m->m_pkthdr.len += data_len;
1400                 mtod(m, struct if_announcemsghdr *)->ifan_msglen += data_len;
1401                 rt_dispatch(m, NULL);
1402         }
1403 }
1404
1405 /*
1406  * This is called to generate routing socket messages indicating
1407  * network interface arrival and departure.
1408  */
1409 void
1410 rt_ifannouncemsg(struct ifnet *ifp, int what)
1411 {
1412         struct mbuf *m;
1413         struct rt_addrinfo info;
1414
1415         m = rt_makeifannouncemsg(ifp, RTM_IFANNOUNCE, what, &info);
1416         if (m != NULL)
1417                 rt_dispatch(m, NULL);
1418 }
1419
1420 static void
1421 rt_dispatch(struct mbuf *m, const struct sockaddr *sa)
1422 {
1423         struct m_tag *tag;
1424
1425         /*
1426          * Preserve the family from the sockaddr, if any, in an m_tag for
1427          * use when injecting the mbuf into the routing socket buffer from
1428          * the netisr.
1429          */
1430         if (sa != NULL) {
1431                 tag = m_tag_get(PACKET_TAG_RTSOCKFAM, sizeof(unsigned short),
1432                     M_NOWAIT);
1433                 if (tag == NULL) {
1434                         m_freem(m);
1435                         return;
1436                 }
1437                 *(unsigned short *)(tag + 1) = sa->sa_family;
1438                 m_tag_prepend(m, tag);
1439         }
1440 #ifdef VIMAGE
1441         if (V_loif)
1442                 m->m_pkthdr.rcvif = V_loif;
1443         else {
1444                 m_freem(m);
1445                 return;
1446         }
1447 #endif
1448         netisr_queue(NETISR_ROUTE, m);  /* mbuf is free'd on failure. */
1449 }
1450
1451 /*
1452  * This is used in dumping the kernel table via sysctl().
1453  */
1454 static int
1455 sysctl_dumpentry(struct radix_node *rn, void *vw)
1456 {
1457         struct walkarg *w = vw;
1458         struct rtentry *rt = (struct rtentry *)rn;
1459         int error = 0, size;
1460         struct rt_addrinfo info;
1461
1462         if (w->w_op == NET_RT_FLAGS && !(rt->rt_flags & w->w_arg))
1463                 return 0;
1464         if ((rt->rt_flags & RTF_HOST) == 0
1465             ? jailed_without_vnet(w->w_req->td->td_ucred)
1466             : prison_if(w->w_req->td->td_ucred, rt_key(rt)) != 0)
1467                 return (0);
1468         bzero((caddr_t)&info, sizeof(info));
1469         info.rti_info[RTAX_DST] = rt_key(rt);
1470         info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
1471         info.rti_info[RTAX_NETMASK] = rt_mask(rt);
1472         info.rti_info[RTAX_GENMASK] = 0;
1473         if (rt->rt_ifp) {
1474                 info.rti_info[RTAX_IFP] = rt->rt_ifp->if_addr->ifa_addr;
1475                 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
1476                 if (rt->rt_ifp->if_flags & IFF_POINTOPOINT)
1477                         info.rti_info[RTAX_BRD] = rt->rt_ifa->ifa_dstaddr;
1478         }
1479         size = rt_msg2(RTM_GET, &info, NULL, w);
1480         if (w->w_req && w->w_tmem) {
1481                 struct rt_msghdr *rtm = (struct rt_msghdr *)w->w_tmem;
1482
1483                 rtm->rtm_flags = rt->rt_flags;
1484                 /*
1485                  * let's be honest about this being a retarded hack
1486                  */
1487                 rtm->rtm_fmask = rt->rt_rmx.rmx_pksent;
1488                 rt_getmetrics(&rt->rt_rmx, &rtm->rtm_rmx);
1489                 rtm->rtm_index = rt->rt_ifp->if_index;
1490                 rtm->rtm_errno = rtm->rtm_pid = rtm->rtm_seq = 0;
1491                 rtm->rtm_addrs = info.rti_addrs;
1492                 error = SYSCTL_OUT(w->w_req, (caddr_t)rtm, size);
1493                 return (error);
1494         }
1495         return (error);
1496 }
1497
1498 #ifdef COMPAT_FREEBSD32
1499 static void
1500 copy_ifdata32(struct if_data *src, struct if_data32 *dst)
1501 {
1502
1503         bzero(dst, sizeof(*dst));
1504         CP(*src, *dst, ifi_type);
1505         CP(*src, *dst, ifi_physical);
1506         CP(*src, *dst, ifi_addrlen);
1507         CP(*src, *dst, ifi_hdrlen);
1508         CP(*src, *dst, ifi_link_state);
1509         dst->ifi_datalen = sizeof(struct if_data32);
1510         CP(*src, *dst, ifi_mtu);
1511         CP(*src, *dst, ifi_metric);
1512         CP(*src, *dst, ifi_baudrate);
1513         CP(*src, *dst, ifi_ipackets);
1514         CP(*src, *dst, ifi_ierrors);
1515         CP(*src, *dst, ifi_opackets);
1516         CP(*src, *dst, ifi_oerrors);
1517         CP(*src, *dst, ifi_collisions);
1518         CP(*src, *dst, ifi_ibytes);
1519         CP(*src, *dst, ifi_obytes);
1520         CP(*src, *dst, ifi_imcasts);
1521         CP(*src, *dst, ifi_omcasts);
1522         CP(*src, *dst, ifi_iqdrops);
1523         CP(*src, *dst, ifi_noproto);
1524         CP(*src, *dst, ifi_hwassist);
1525         CP(*src, *dst, ifi_epoch);
1526         TV_CP(*src, *dst, ifi_lastchange);
1527 }
1528 #endif
1529
1530 static int
1531 sysctl_iflist(int af, struct walkarg *w)
1532 {
1533         struct ifnet *ifp;
1534         struct ifaddr *ifa;
1535         struct rt_addrinfo info;
1536         int len, error = 0;
1537
1538         bzero((caddr_t)&info, sizeof(info));
1539         IFNET_RLOCK();
1540         TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1541                 if (w->w_arg && w->w_arg != ifp->if_index)
1542                         continue;
1543                 IF_ADDR_LOCK(ifp);
1544                 ifa = ifp->if_addr;
1545                 info.rti_info[RTAX_IFP] = ifa->ifa_addr;
1546                 len = rt_msg2(RTM_IFINFO, &info, NULL, w);
1547                 info.rti_info[RTAX_IFP] = NULL;
1548                 if (w->w_req && w->w_tmem) {
1549                         struct if_msghdr *ifm;
1550
1551 #ifdef COMPAT_FREEBSD32
1552                         if (w->w_req->flags & SCTL_MASK32) {
1553                                 struct if_msghdr32 *ifm32;
1554
1555                                 ifm32 = (struct if_msghdr32 *)w->w_tmem;
1556                                 ifm32->ifm_index = ifp->if_index;
1557                                 ifm32->ifm_flags = ifp->if_flags |
1558                                     ifp->if_drv_flags;
1559                                 copy_ifdata32(&ifp->if_data, &ifm32->ifm_data);
1560                                 ifm32->ifm_addrs = info.rti_addrs;
1561                                 error = SYSCTL_OUT(w->w_req, (caddr_t)ifm32,
1562                                     len);
1563                                 goto sysctl_out;
1564                         }
1565 #endif
1566                         ifm = (struct if_msghdr *)w->w_tmem;
1567                         ifm->ifm_index = ifp->if_index;
1568                         ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
1569                         ifm->ifm_data = ifp->if_data;
1570                         ifm->ifm_addrs = info.rti_addrs;
1571                         error = SYSCTL_OUT(w->w_req, (caddr_t)ifm, len);
1572 #ifdef COMPAT_FREEBSD32
1573                 sysctl_out:
1574 #endif
1575                         if (error)
1576                                 goto done;
1577                 }
1578                 while ((ifa = TAILQ_NEXT(ifa, ifa_link)) != NULL) {
1579                         if (af && af != ifa->ifa_addr->sa_family)
1580                                 continue;
1581                         if (prison_if(w->w_req->td->td_ucred,
1582                             ifa->ifa_addr) != 0)
1583                                 continue;
1584                         info.rti_info[RTAX_IFA] = ifa->ifa_addr;
1585                         info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask;
1586                         info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr;
1587                         len = rt_msg2(RTM_NEWADDR, &info, NULL, w);
1588                         if (w->w_req && w->w_tmem) {
1589                                 struct ifa_msghdr *ifam;
1590
1591                                 ifam = (struct ifa_msghdr *)w->w_tmem;
1592                                 ifam->ifam_index = ifa->ifa_ifp->if_index;
1593                                 ifam->ifam_flags = ifa->ifa_flags;
1594                                 ifam->ifam_metric = ifa->ifa_metric;
1595                                 ifam->ifam_addrs = info.rti_addrs;
1596                                 error = SYSCTL_OUT(w->w_req, w->w_tmem, len);
1597                                 if (error)
1598                                         goto done;
1599                         }
1600                 }
1601                 IF_ADDR_UNLOCK(ifp);
1602                 info.rti_info[RTAX_IFA] = info.rti_info[RTAX_NETMASK] =
1603                         info.rti_info[RTAX_BRD] = NULL;
1604         }
1605 done:
1606         if (ifp != NULL)
1607                 IF_ADDR_UNLOCK(ifp);
1608         IFNET_RUNLOCK();
1609         return (error);
1610 }
1611
1612 static int
1613 sysctl_ifmalist(int af, struct walkarg *w)
1614 {
1615         struct ifnet *ifp;
1616         struct ifmultiaddr *ifma;
1617         struct  rt_addrinfo info;
1618         int     len, error = 0;
1619         struct ifaddr *ifa;
1620
1621         bzero((caddr_t)&info, sizeof(info));
1622         IFNET_RLOCK();
1623         TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1624                 if (w->w_arg && w->w_arg != ifp->if_index)
1625                         continue;
1626                 ifa = ifp->if_addr;
1627                 info.rti_info[RTAX_IFP] = ifa ? ifa->ifa_addr : NULL;
1628                 IF_ADDR_LOCK(ifp);
1629                 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1630                         if (af && af != ifma->ifma_addr->sa_family)
1631                                 continue;
1632                         if (prison_if(w->w_req->td->td_ucred,
1633                             ifma->ifma_addr) != 0)
1634                                 continue;
1635                         info.rti_info[RTAX_IFA] = ifma->ifma_addr;
1636                         info.rti_info[RTAX_GATEWAY] =
1637                             (ifma->ifma_addr->sa_family != AF_LINK) ?
1638                             ifma->ifma_lladdr : NULL;
1639                         len = rt_msg2(RTM_NEWMADDR, &info, NULL, w);
1640                         if (w->w_req && w->w_tmem) {
1641                                 struct ifma_msghdr *ifmam;
1642
1643                                 ifmam = (struct ifma_msghdr *)w->w_tmem;
1644                                 ifmam->ifmam_index = ifma->ifma_ifp->if_index;
1645                                 ifmam->ifmam_flags = 0;
1646                                 ifmam->ifmam_addrs = info.rti_addrs;
1647                                 error = SYSCTL_OUT(w->w_req, w->w_tmem, len);
1648                                 if (error) {
1649                                         IF_ADDR_UNLOCK(ifp);
1650                                         goto done;
1651                                 }
1652                         }
1653                 }
1654                 IF_ADDR_UNLOCK(ifp);
1655         }
1656 done:
1657         IFNET_RUNLOCK();
1658         return (error);
1659 }
1660
1661 static int
1662 sysctl_rtsock(SYSCTL_HANDLER_ARGS)
1663 {
1664         int     *name = (int *)arg1;
1665         u_int   namelen = arg2;
1666         struct radix_node_head *rnh = NULL; /* silence compiler. */
1667         int     i, lim, error = EINVAL;
1668         u_char  af;
1669         struct  walkarg w;
1670
1671         name ++;
1672         namelen--;
1673         if (req->newptr)
1674                 return (EPERM);
1675         if (namelen != 3)
1676                 return ((namelen < 3) ? EISDIR : ENOTDIR);
1677         af = name[0];
1678         if (af > AF_MAX)
1679                 return (EINVAL);
1680         bzero(&w, sizeof(w));
1681         w.w_op = name[1];
1682         w.w_arg = name[2];
1683         w.w_req = req;
1684
1685         error = sysctl_wire_old_buffer(req, 0);
1686         if (error)
1687                 return (error);
1688         switch (w.w_op) {
1689
1690         case NET_RT_DUMP:
1691         case NET_RT_FLAGS:
1692                 if (af == 0) {                  /* dump all tables */
1693                         i = 1;
1694                         lim = AF_MAX;
1695                 } else                          /* dump only one table */
1696                         i = lim = af;
1697
1698                 /*
1699                  * take care of llinfo entries, the caller must
1700                  * specify an AF
1701                  */
1702                 if (w.w_op == NET_RT_FLAGS &&
1703                     (w.w_arg == 0 || w.w_arg & RTF_LLINFO)) {
1704                         if (af != 0)
1705                                 error = lltable_sysctl_dumparp(af, w.w_req);
1706                         else
1707                                 error = EINVAL;
1708                         break;
1709                 }
1710                 /*
1711                  * take care of routing entries
1712                  */
1713                 for (error = 0; error == 0 && i <= lim; i++) {
1714                         rnh = rt_tables_get_rnh(req->td->td_proc->p_fibnum, i);
1715                         if (rnh != NULL) {
1716                                 RADIX_NODE_HEAD_LOCK(rnh);
1717                                 error = rnh->rnh_walktree(rnh,
1718                                     sysctl_dumpentry, &w);
1719                                 RADIX_NODE_HEAD_UNLOCK(rnh);
1720                         } else if (af != 0)
1721                                 error = EAFNOSUPPORT;
1722                 }
1723                 break;
1724
1725         case NET_RT_IFLIST:
1726                 error = sysctl_iflist(af, &w);
1727                 break;
1728
1729         case NET_RT_IFMALIST:
1730                 error = sysctl_ifmalist(af, &w);
1731                 break;
1732         }
1733         if (w.w_tmem)
1734                 free(w.w_tmem, M_RTABLE);
1735         return (error);
1736 }
1737
1738 SYSCTL_NODE(_net, PF_ROUTE, routetable, CTLFLAG_RD, sysctl_rtsock, "");
1739
1740 /*
1741  * Definitions of protocols supported in the ROUTE domain.
1742  */
1743
1744 static struct domain routedomain;               /* or at least forward */
1745
1746 static struct protosw routesw[] = {
1747 {
1748         .pr_type =              SOCK_RAW,
1749         .pr_domain =            &routedomain,
1750         .pr_flags =             PR_ATOMIC|PR_ADDR,
1751         .pr_output =            route_output,
1752         .pr_ctlinput =          raw_ctlinput,
1753         .pr_init =              raw_init,
1754         .pr_usrreqs =           &route_usrreqs
1755 }
1756 };
1757
1758 static struct domain routedomain = {
1759         .dom_family =           PF_ROUTE,
1760         .dom_name =              "route",
1761         .dom_protosw =          routesw,
1762         .dom_protoswNPROTOSW =  &routesw[sizeof(routesw)/sizeof(routesw[0])]
1763 };
1764
1765 VNET_DOMAIN_SET(route);