sys/net/rtsock.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1988, 1991, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  *      @(#)rtsock.c    8.7 (Berkeley) 10/12/95
  32  * $FreeBSD$
  33  */
  34 #include "opt_ddb.h"
  35 #include "opt_mpath.h"
  36 #include "opt_inet.h"
  37 #include "opt_inet6.h"
  38
  39 #include <sys/param.h>
  40 #include <sys/jail.h>
  41 #include <sys/kernel.h>
  42 #include <sys/domain.h>
  43 #include <sys/lock.h>
  44 #include <sys/malloc.h>
  45 #include <sys/mbuf.h>
  46 #include <sys/priv.h>
  47 #include <sys/proc.h>
  48 #include <sys/protosw.h>
  49 #include <sys/rmlock.h>
  50 #include <sys/rwlock.h>
  51 #include <sys/signalvar.h>
  52 #include <sys/socket.h>
  53 #include <sys/socketvar.h>
  54 #include <sys/sysctl.h>
  55 #include <sys/systm.h>
  56
  57 #include <net/if.h>
  58 #include <net/if_var.h>
  59 #include <net/if_dl.h>
  60 #include <net/if_llatbl.h>
  61 #include <net/if_types.h>
  62 #include <net/netisr.h>
  63 #include <net/raw_cb.h>
  64 #include <net/route.h>
  65 #include <net/route/route_var.h>
  66 #ifdef RADIX_MPATH
  67 #include <net/radix_mpath.h>
  68 #endif
  69 #include <net/vnet.h>
  70
  71 #include <netinet/in.h>
  72 #include <netinet/if_ether.h>
  73 #include <netinet/ip_carp.h>
  74 #ifdef INET6
  75 #include <netinet6/ip6_var.h>
  76 #include <netinet6/scope6_var.h>
  77 #endif
  78 #include <net/route/nhop.h>
  79 #include <net/route/shared.h>
  80
  81 #ifdef COMPAT_FREEBSD32
  82 #include <sys/mount.h>
  83 #include <compat/freebsd32/freebsd32.h>
  84
  85 struct if_msghdr32 {
  86         uint16_t ifm_msglen;
  87         uint8_t ifm_version;
  88         uint8_t ifm_type;
  89         int32_t ifm_addrs;
  90         int32_t ifm_flags;
  91         uint16_t ifm_index;
  92         uint16_t _ifm_spare1;
  93         struct  if_data ifm_data;
  94 };
  95
  96 struct if_msghdrl32 {
  97         uint16_t ifm_msglen;
  98         uint8_t ifm_version;
  99         uint8_t ifm_type;
 100         int32_t ifm_addrs;
 101         int32_t ifm_flags;
 102         uint16_t ifm_index;
 103         uint16_t _ifm_spare1;
 104         uint16_t ifm_len;
 105         uint16_t ifm_data_off;
 106         uint32_t _ifm_spare2;
 107         struct  if_data ifm_data;
 108 };
 109
 110 struct ifa_msghdrl32 {
 111         uint16_t ifam_msglen;
 112         uint8_t ifam_version;
 113         uint8_t ifam_type;
 114         int32_t ifam_addrs;
 115         int32_t ifam_flags;
 116         uint16_t ifam_index;
 117         uint16_t _ifam_spare1;
 118         uint16_t ifam_len;
 119         uint16_t ifam_data_off;
 120         int32_t ifam_metric;
 121         struct  if_data ifam_data;
 122 };
 123
 124 #define SA_SIZE32(sa)                                           \
 125     (  (((struct sockaddr *)(sa))->sa_len == 0) ?               \
 126         sizeof(int)             :                               \
 127         1 + ( (((struct sockaddr *)(sa))->sa_len - 1) | (sizeof(int) - 1) ) )
 128
 129 #endif /* COMPAT_FREEBSD32 */
 130
 131 MALLOC_DEFINE(M_RTABLE, "routetbl", "routing tables");
 132
 133 /* NB: these are not modified */
 134 static struct   sockaddr route_src = { 2, PF_ROUTE, };
 135 static struct   sockaddr sa_zero   = { sizeof(sa_zero), AF_INET, };
 136
 137 /* These are external hooks for CARP. */
 138 int     (*carp_get_vhid_p)(struct ifaddr *);
 139
 140 /*
 141  * Used by rtsock/raw_input callback code to decide whether to filter the update
 142  * notification to a socket bound to a particular FIB.
 143  */
 144 #define RTS_FILTER_FIB  M_PROTO8
 145
 146 typedef struct {
 147         int     ip_count;       /* attached w/ AF_INET */
 148         int     ip6_count;      /* attached w/ AF_INET6 */
 149         int     any_count;      /* total attached */
 150 } route_cb_t;
 151 VNET_DEFINE_STATIC(route_cb_t, route_cb);
 152 #define V_route_cb VNET(route_cb)
 153
 154 struct mtx rtsock_mtx;
 155 MTX_SYSINIT(rtsock, &rtsock_mtx, "rtsock route_cb lock", MTX_DEF);
 156
 157 #define RTSOCK_LOCK()   mtx_lock(&rtsock_mtx)
 158 #define RTSOCK_UNLOCK() mtx_unlock(&rtsock_mtx)
 159 #define RTSOCK_LOCK_ASSERT()    mtx_assert(&rtsock_mtx, MA_OWNED)
 160
 161 static SYSCTL_NODE(_net, OID_AUTO, route, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
 162     "");
 163
 164 struct walkarg {
 165         int     w_tmemsize;
 166         int     w_op, w_arg;
 167         caddr_t w_tmem;
 168         struct sysctl_req *w_req;
 169 };
 170
 171 static void     rts_input(struct mbuf *m);
 172 static struct mbuf *rtsock_msg_mbuf(int type, struct rt_addrinfo *rtinfo);
 173 static int      rtsock_msg_buffer(int type, struct rt_addrinfo *rtinfo,
 174                         struct walkarg *w, int *plen);
 175 static int      rt_xaddrs(caddr_t cp, caddr_t cplim,
 176                         struct rt_addrinfo *rtinfo);
 177 static int      sysctl_dumpentry(struct radix_node *rn, void *vw);
 178 static int      sysctl_iflist(int af, struct walkarg *w);
 179 static int      sysctl_ifmalist(int af, struct walkarg *w);
 180 static int      route_output(struct mbuf *m, struct socket *so, ...);
 181 static void     rt_getmetrics(const struct rtentry *rt, struct rt_metrics *out);
 182 static void     rt_dispatch(struct mbuf *, sa_family_t);
 183 static int      handle_rtm_get(struct rt_addrinfo *info, u_int fibnum,
 184                         struct rt_msghdr *rtm, struct rtentry **ret_nrt);
 185 static int      update_rtm_from_rte(struct rt_addrinfo *info,
 186                         struct rt_msghdr **prtm, int alloc_len,
 187                         struct rtentry *rt);
 188 static void     send_rtm_reply(struct socket *so, struct rt_msghdr *rtm,
 189                         struct mbuf *m, sa_family_t saf, u_int fibnum,
 190                         int rtm_errno);
 191 static int      can_export_rte(struct ucred *td_ucred, const struct rtentry *rt);
 192
 193 static struct netisr_handler rtsock_nh = {
 194         .nh_name = "rtsock",
 195         .nh_handler = rts_input,
 196         .nh_proto = NETISR_ROUTE,
 197         .nh_policy = NETISR_POLICY_SOURCE,
 198 };
 199
 200 static int
 201 sysctl_route_netisr_maxqlen(SYSCTL_HANDLER_ARGS)
 202 {
 203         int error, qlimit;
 204
 205         netisr_getqlimit(&rtsock_nh, &qlimit);
 206         error = sysctl_handle_int(oidp, &qlimit, 0, req);
 207         if (error || !req->newptr)
 208                 return (error);
 209         if (qlimit < 1)
 210                 return (EINVAL);
 211         return (netisr_setqlimit(&rtsock_nh, qlimit));
 212 }
 213 SYSCTL_PROC(_net_route, OID_AUTO, netisr_maxqlen,
 214     CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
 215     0, 0, sysctl_route_netisr_maxqlen, "I",
 216     "maximum routing socket dispatch queue length");
 217
 218 static void
 219 vnet_rts_init(void)
 220 {
 221         int tmp;
 222
 223         if (IS_DEFAULT_VNET(curvnet)) {
 224                 if (TUNABLE_INT_FETCH("net.route.netisr_maxqlen", &tmp))
 225                         rtsock_nh.nh_qlimit = tmp;
 226                 netisr_register(&rtsock_nh);
 227         }
 228 #ifdef VIMAGE
 229          else
 230                 netisr_register_vnet(&rtsock_nh);
 231 #endif
 232 }
 233 VNET_SYSINIT(vnet_rtsock, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD,
 234     vnet_rts_init, 0);
 235
 236 #ifdef VIMAGE
 237 static void
 238 vnet_rts_uninit(void)
 239 {
 240
 241         netisr_unregister_vnet(&rtsock_nh);
 242 }
 243 VNET_SYSUNINIT(vnet_rts_uninit, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD,
 244     vnet_rts_uninit, 0);
 245 #endif
 246
 247 static int
 248 raw_input_rts_cb(struct mbuf *m, struct sockproto *proto, struct sockaddr *src,
 249     struct rawcb *rp)
 250 {
 251         int fibnum;
 252
 253         KASSERT(m != NULL, ("%s: m is NULL", __func__));
 254         KASSERT(proto != NULL, ("%s: proto is NULL", __func__));
 255         KASSERT(rp != NULL, ("%s: rp is NULL", __func__));
 256
 257         /* No filtering requested. */
 258         if ((m->m_flags & RTS_FILTER_FIB) == 0)
 259                 return (0);
 260
 261         /* Check if it is a rts and the fib matches the one of the socket. */
 262         fibnum = M_GETFIB(m);
 263         if (proto->sp_family != PF_ROUTE ||
 264             rp->rcb_socket == NULL ||
 265             rp->rcb_socket->so_fibnum == fibnum)
 266                 return (0);
 267
 268         /* Filtering requested and no match, the socket shall be skipped. */
 269         return (1);
 270 }
 271
 272 static void
 273 rts_input(struct mbuf *m)
 274 {
 275         struct sockproto route_proto;
 276         unsigned short *family;
 277         struct m_tag *tag;
 278
 279         route_proto.sp_family = PF_ROUTE;
 280         tag = m_tag_find(m, PACKET_TAG_RTSOCKFAM, NULL);
 281         if (tag != NULL) {
 282                 family = (unsigned short *)(tag + 1);
 283                 route_proto.sp_protocol = *family;
 284                 m_tag_delete(m, tag);
 285         } else
 286                 route_proto.sp_protocol = 0;
 287
 288         raw_input_ext(m, &route_proto, &route_src, raw_input_rts_cb);
 289 }
 290
 291 /*
 292  * It really doesn't make any sense at all for this code to share much
 293  * with raw_usrreq.c, since its functionality is so restricted.  XXX
 294  */
 295 static void
 296 rts_abort(struct socket *so)
 297 {
 298
 299         raw_usrreqs.pru_abort(so);
 300 }
 301
 302 static void
 303 rts_close(struct socket *so)
 304 {
 305
 306         raw_usrreqs.pru_close(so);
 307 }
 308
 309 /* pru_accept is EOPNOTSUPP */
 310
 311 static int
 312 rts_attach(struct socket *so, int proto, struct thread *td)
 313 {
 314         struct rawcb *rp;
 315         int error;
 316
 317         KASSERT(so->so_pcb == NULL, ("rts_attach: so_pcb != NULL"));
 318
 319         /* XXX */
 320         rp = malloc(sizeof *rp, M_PCB, M_WAITOK | M_ZERO);
 321
 322         so->so_pcb = (caddr_t)rp;
 323         so->so_fibnum = td->td_proc->p_fibnum;
 324         error = raw_attach(so, proto);
 325         rp = sotorawcb(so);
 326         if (error) {
 327                 so->so_pcb = NULL;
 328                 free(rp, M_PCB);
 329                 return error;
 330         }
 331         RTSOCK_LOCK();
 332         switch(rp->rcb_proto.sp_protocol) {
 333         case AF_INET:
 334                 V_route_cb.ip_count++;
 335                 break;
 336         case AF_INET6:
 337                 V_route_cb.ip6_count++;
 338                 break;
 339         }
 340         V_route_cb.any_count++;
 341         RTSOCK_UNLOCK();
 342         soisconnected(so);
 343         so->so_options |= SO_USELOOPBACK;
 344         return 0;
 345 }
 346
 347 static int
 348 rts_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 349 {
 350
 351         return (raw_usrreqs.pru_bind(so, nam, td)); /* xxx just EINVAL */
 352 }
 353
 354 static int
 355 rts_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 356 {
 357
 358         return (raw_usrreqs.pru_connect(so, nam, td)); /* XXX just EINVAL */
 359 }
 360
 361 /* pru_connect2 is EOPNOTSUPP */
 362 /* pru_control is EOPNOTSUPP */
 363
 364 static void
 365 rts_detach(struct socket *so)
 366 {
 367         struct rawcb *rp = sotorawcb(so);
 368
 369         KASSERT(rp != NULL, ("rts_detach: rp == NULL"));
 370
 371         RTSOCK_LOCK();
 372         switch(rp->rcb_proto.sp_protocol) {
 373         case AF_INET:
 374                 V_route_cb.ip_count--;
 375                 break;
 376         case AF_INET6:
 377                 V_route_cb.ip6_count--;
 378                 break;
 379         }
 380         V_route_cb.any_count--;
 381         RTSOCK_UNLOCK();
 382         raw_usrreqs.pru_detach(so);
 383 }
 384
 385 static int
 386 rts_disconnect(struct socket *so)
 387 {
 388
 389         return (raw_usrreqs.pru_disconnect(so));
 390 }
 391
 392 /* pru_listen is EOPNOTSUPP */
 393
 394 static int
 395 rts_peeraddr(struct socket *so, struct sockaddr **nam)
 396 {
 397
 398         return (raw_usrreqs.pru_peeraddr(so, nam));
 399 }
 400
 401 /* pru_rcvd is EOPNOTSUPP */
 402 /* pru_rcvoob is EOPNOTSUPP */
 403
 404 static int
 405 rts_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
 406          struct mbuf *control, struct thread *td)
 407 {
 408
 409         return (raw_usrreqs.pru_send(so, flags, m, nam, control, td));
 410 }
 411
 412 /* pru_sense is null */
 413
 414 static int
 415 rts_shutdown(struct socket *so)
 416 {
 417
 418         return (raw_usrreqs.pru_shutdown(so));
 419 }
 420
 421 static int
 422 rts_sockaddr(struct socket *so, struct sockaddr **nam)
 423 {
 424
 425         return (raw_usrreqs.pru_sockaddr(so, nam));
 426 }
 427
 428 static struct pr_usrreqs route_usrreqs = {
 429         .pru_abort =            rts_abort,
 430         .pru_attach =           rts_attach,
 431         .pru_bind =             rts_bind,
 432         .pru_connect =          rts_connect,
 433         .pru_detach =           rts_detach,
 434         .pru_disconnect =       rts_disconnect,
 435         .pru_peeraddr =         rts_peeraddr,
 436         .pru_send =             rts_send,
 437         .pru_shutdown =         rts_shutdown,
 438         .pru_sockaddr =         rts_sockaddr,
 439         .pru_close =            rts_close,
 440 };
 441
 442 #ifndef _SOCKADDR_UNION_DEFINED
 443 #define _SOCKADDR_UNION_DEFINED
 444 /*
 445  * The union of all possible address formats we handle.
 446  */
 447 union sockaddr_union {
 448         struct sockaddr         sa;
 449         struct sockaddr_in      sin;
 450         struct sockaddr_in6     sin6;
 451 };
 452 #endif /* _SOCKADDR_UNION_DEFINED */
 453
 454 static int
 455 rtm_get_jailed(struct rt_addrinfo *info, struct ifnet *ifp,
 456     struct nhop_object *nh, union sockaddr_union *saun, struct ucred *cred)
 457 {
 458 #if defined(INET) || defined(INET6)
 459         struct epoch_tracker et;
 460 #endif
 461
 462         /* First, see if the returned address is part of the jail. */
 463         if (prison_if(cred, nh->nh_ifa->ifa_addr) == 0) {
 464                 info->rti_info[RTAX_IFA] = nh->nh_ifa->ifa_addr;
 465                 return (0);
 466         }
 467
 468         switch (info->rti_info[RTAX_DST]->sa_family) {
 469 #ifdef INET
 470         case AF_INET:
 471         {
 472                 struct in_addr ia;
 473                 struct ifaddr *ifa;
 474                 int found;
 475
 476                 found = 0;
 477                 /*
 478                  * Try to find an address on the given outgoing interface
 479                  * that belongs to the jail.
 480                  */
 481                 NET_EPOCH_ENTER(et);
 482                 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 483                         struct sockaddr *sa;
 484                         sa = ifa->ifa_addr;
 485                         if (sa->sa_family != AF_INET)
 486                                 continue;
 487                         ia = ((struct sockaddr_in *)sa)->sin_addr;
 488                         if (prison_check_ip4(cred, &ia) == 0) {
 489                                 found = 1;
 490                                 break;
 491                         }
 492                 }
 493                 NET_EPOCH_EXIT(et);
 494                 if (!found) {
 495                         /*
 496                          * As a last resort return the 'default' jail address.
 497                          */
 498                         ia = ((struct sockaddr_in *)nh->nh_ifa->ifa_addr)->
 499                             sin_addr;
 500                         if (prison_get_ip4(cred, &ia) != 0)
 501                                 return (ESRCH);
 502                 }
 503                 bzero(&saun->sin, sizeof(struct sockaddr_in));
 504                 saun->sin.sin_len = sizeof(struct sockaddr_in);
 505                 saun->sin.sin_family = AF_INET;
 506                 saun->sin.sin_addr.s_addr = ia.s_addr;
 507                 info->rti_info[RTAX_IFA] = (struct sockaddr *)&saun->sin;
 508                 break;
 509         }
 510 #endif
 511 #ifdef INET6
 512         case AF_INET6:
 513         {
 514                 struct in6_addr ia6;
 515                 struct ifaddr *ifa;
 516                 int found;
 517
 518                 found = 0;
 519                 /*
 520                  * Try to find an address on the given outgoing interface
 521                  * that belongs to the jail.
 522                  */
 523                 NET_EPOCH_ENTER(et);
 524                 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 525                         struct sockaddr *sa;
 526                         sa = ifa->ifa_addr;
 527                         if (sa->sa_family != AF_INET6)
 528                                 continue;
 529                         bcopy(&((struct sockaddr_in6 *)sa)->sin6_addr,
 530                             &ia6, sizeof(struct in6_addr));
 531                         if (prison_check_ip6(cred, &ia6) == 0) {
 532                                 found = 1;
 533                                 break;
 534                         }
 535                 }
 536                 NET_EPOCH_EXIT(et);
 537                 if (!found) {
 538                         /*
 539                          * As a last resort return the 'default' jail address.
 540                          */
 541                         ia6 = ((struct sockaddr_in6 *)nh->nh_ifa->ifa_addr)->
 542                             sin6_addr;
 543                         if (prison_get_ip6(cred, &ia6) != 0)
 544                                 return (ESRCH);
 545                 }
 546                 bzero(&saun->sin6, sizeof(struct sockaddr_in6));
 547                 saun->sin6.sin6_len = sizeof(struct sockaddr_in6);
 548                 saun->sin6.sin6_family = AF_INET6;
 549                 bcopy(&ia6, &saun->sin6.sin6_addr, sizeof(struct in6_addr));
 550                 if (sa6_recoverscope(&saun->sin6) != 0)
 551                         return (ESRCH);
 552                 info->rti_info[RTAX_IFA] = (struct sockaddr *)&saun->sin6;
 553                 break;
 554         }
 555 #endif
 556         default:
 557                 return (ESRCH);
 558         }
 559         return (0);
 560 }
 561
 562 /*
 563  * Fills in @info based on userland-provided @rtm message.
 564  *
 565  * Returns 0 on success.
 566  */
 567 static int
 568 fill_addrinfo(struct rt_msghdr *rtm, int len, u_int fibnum, struct rt_addrinfo *info)
 569 {
 570         int error;
 571         sa_family_t saf;
 572
 573         rtm->rtm_pid = curproc->p_pid;
 574         info->rti_addrs = rtm->rtm_addrs;
 575
 576         info->rti_mflags = rtm->rtm_inits;
 577         info->rti_rmx = &rtm->rtm_rmx;
 578
 579         /*
 580          * rt_xaddrs() performs s6_addr[2] := sin6_scope_id for AF_INET6
 581          * link-local address because rtrequest requires addresses with
 582          * embedded scope id.
 583          */
 584         if (rt_xaddrs((caddr_t)(rtm + 1), len + (caddr_t)rtm, info))
 585                 return (EINVAL);
 586
 587         if (rtm->rtm_flags & RTF_RNH_LOCKED)
 588                 return (EINVAL);
 589         info->rti_flags = rtm->rtm_flags;
 590         if (info->rti_info[RTAX_DST] == NULL ||
 591             info->rti_info[RTAX_DST]->sa_family >= AF_MAX ||
 592             (info->rti_info[RTAX_GATEWAY] != NULL &&
 593              info->rti_info[RTAX_GATEWAY]->sa_family >= AF_MAX))
 594                 return (EINVAL);
 595         saf = info->rti_info[RTAX_DST]->sa_family;
 596         /*
 597          * Verify that the caller has the appropriate privilege; RTM_GET
 598          * is the only operation the non-superuser is allowed.
 599          */
 600         if (rtm->rtm_type != RTM_GET) {
 601                 error = priv_check(curthread, PRIV_NET_ROUTE);
 602                 if (error != 0)
 603                         return (error);
 604         }
 605
 606         /*
 607          * The given gateway address may be an interface address.
 608          * For example, issuing a "route change" command on a route
 609          * entry that was created from a tunnel, and the gateway
 610          * address given is the local end point. In this case the
 611          * RTF_GATEWAY flag must be cleared or the destination will
 612          * not be reachable even though there is no error message.
 613          */
 614         if (info->rti_info[RTAX_GATEWAY] != NULL &&
 615             info->rti_info[RTAX_GATEWAY]->sa_family != AF_LINK) {
 616                 struct rt_addrinfo ginfo;
 617                 struct sockaddr *gdst;
 618                 struct sockaddr_storage ss;
 619
 620                 bzero(&ginfo, sizeof(ginfo));
 621                 bzero(&ss, sizeof(ss));
 622                 ss.ss_len = sizeof(ss);
 623
 624                 ginfo.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&ss;
 625                 gdst = info->rti_info[RTAX_GATEWAY];
 626
 627                 /*
 628                  * A host route through the loopback interface is
 629                  * installed for each interface adddress. In pre 8.0
 630                  * releases the interface address of a PPP link type
 631                  * is not reachable locally. This behavior is fixed as
 632                  * part of the new L2/L3 redesign and rewrite work. The
 633                  * signature of this interface address route is the
 634                  * AF_LINK sa_family type of the gateway, and the
 635                  * rt_ifp has the IFF_LOOPBACK flag set.
 636                  */
 637                 if (rib_lookup_info(fibnum, gdst, NHR_REF, 0, &ginfo) == 0) {
 638                         if (ss.ss_family == AF_LINK &&
 639                             ginfo.rti_ifp->if_flags & IFF_LOOPBACK) {
 640                                 info->rti_flags &= ~RTF_GATEWAY;
 641                                 info->rti_flags |= RTF_GWFLAG_COMPAT;
 642                         }
 643                         rib_free_info(&ginfo);
 644                 }
 645         }
 646
 647         return (0);
 648 }
 649
 650 /*
 651  * Handles RTM_GET message from routing socket, returning matching rt.
 652  *
 653  * Returns:
 654  * 0 on success, with locked and referenced matching rt in @rt_nrt
 655  * errno of failure
 656  */
 657 static int
 658 handle_rtm_get(struct rt_addrinfo *info, u_int fibnum,
 659     struct rt_msghdr *rtm, struct rtentry **ret_nrt)
 660 {
 661         RIB_RLOCK_TRACKER;
 662         struct rtentry *rt;
 663         struct rib_head *rnh;
 664         sa_family_t saf;
 665
 666         saf = info->rti_info[RTAX_DST]->sa_family;
 667
 668         rnh = rt_tables_get_rnh(fibnum, saf);
 669         if (rnh == NULL)
 670                 return (EAFNOSUPPORT);
 671
 672         RIB_RLOCK(rnh);
 673
 674         if (info->rti_info[RTAX_NETMASK] == NULL) {
 675                 /*
 676                  * Provide longest prefix match for
 677                  * address lookup (no mask).
 678                  * 'route -n get addr'
 679                  */
 680                 rt = (struct rtentry *) rnh->rnh_matchaddr(
 681                     info->rti_info[RTAX_DST], &rnh->head);
 682         } else
 683                 rt = (struct rtentry *) rnh->rnh_lookup(
 684                     info->rti_info[RTAX_DST],
 685                     info->rti_info[RTAX_NETMASK], &rnh->head);
 686
 687         if (rt == NULL) {
 688                 RIB_RUNLOCK(rnh);
 689                 return (ESRCH);
 690         }
 691 #ifdef RADIX_MPATH
 692         /*
 693          * for RTM_GET, gate is optional even with multipath.
 694          * if gate == NULL the first match is returned.
 695          * (no need to call rt_mpath_matchgate if gate == NULL)
 696          */
 697         if (rt_mpath_capable(rnh) && info->rti_info[RTAX_GATEWAY]) {
 698                 rt = rt_mpath_matchgate(rt, info->rti_info[RTAX_GATEWAY]);
 699                 if (!rt) {
 700                         RIB_RUNLOCK(rnh);
 701                         return (ESRCH);
 702                 }
 703         }
 704 #endif
 705         /*
 706          * If performing proxied L2 entry insertion, and
 707          * the actual PPP host entry is found, perform
 708          * another search to retrieve the prefix route of
 709          * the local end point of the PPP link.
 710          * TODO: move this logic to userland.
 711          */
 712         if (rtm->rtm_flags & RTF_ANNOUNCE) {
 713                 struct sockaddr laddr;
 714                 struct nhop_object *nh;
 715
 716                 nh = rt->rt_nhop;
 717                 if (nh->nh_ifp != NULL &&
 718                     nh->nh_ifp->if_type == IFT_PROPVIRTUAL) {
 719                         struct epoch_tracker et;
 720                         struct ifaddr *ifa;
 721
 722                         NET_EPOCH_ENTER(et);
 723                         ifa = ifa_ifwithnet(info->rti_info[RTAX_DST], 1,
 724                                         RT_ALL_FIBS);
 725                         NET_EPOCH_EXIT(et);
 726                         if (ifa != NULL)
 727                                 rt_maskedcopy(ifa->ifa_addr,
 728                                               &laddr,
 729                                               ifa->ifa_netmask);
 730                 } else
 731                         rt_maskedcopy(nh->nh_ifa->ifa_addr,
 732                                       &laddr,
 733                                       nh->nh_ifa->ifa_netmask);
 734                 /*
 735                  * refactor rt and no lock operation necessary
 736                  */
 737                 rt = (struct rtentry *)rnh->rnh_matchaddr(&laddr,
 738                     &rnh->head);
 739                 if (rt == NULL) {
 740                         RIB_RUNLOCK(rnh);
 741                         return (ESRCH);
 742                 }
 743         }
 744         RT_LOCK(rt);
 745         RIB_RUNLOCK(rnh);
 746
 747         *ret_nrt = rt;
 748
 749         return (0);
 750 }
 751
 752 /*
 753  * Update sockaddrs, flags, etc in @prtm based on @rt data.
 754  * Assumes @rt is locked.
 755  * rtm can be reallocated.
 756  *
 757  * Returns 0 on success, along with pointer to (potentially reallocated)
 758  *  rtm.
 759  *
 760  */
 761 static int
 762 update_rtm_from_rte(struct rt_addrinfo *info, struct rt_msghdr **prtm,
 763     int alloc_len, struct rtentry *rt)
 764 {
 765         struct sockaddr_storage netmask_ss;
 766         struct walkarg w;
 767         union sockaddr_union saun;
 768         struct rt_msghdr *rtm, *orig_rtm = NULL;
 769         struct nhop_object *nh;
 770         struct ifnet *ifp;
 771         int error, len;
 772
 773         RT_LOCK_ASSERT(rt);
 774
 775         rtm = *prtm;
 776
 777         nh = rt->rt_nhop;
 778         info->rti_info[RTAX_DST] = rt_key(rt);
 779         info->rti_info[RTAX_GATEWAY] = &nh->gw_sa;
 780         info->rti_info[RTAX_NETMASK] = rtsock_fix_netmask(rt_key(rt),
 781             rt_mask(rt), &netmask_ss);
 782         info->rti_info[RTAX_GENMASK] = 0;
 783         ifp = nh->nh_ifp;
 784         if (rtm->rtm_addrs & (RTA_IFP | RTA_IFA)) {
 785                 if (ifp) {
 786                         info->rti_info[RTAX_IFP] =
 787                             ifp->if_addr->ifa_addr;
 788                         error = rtm_get_jailed(info, ifp, nh,
 789                             &saun, curthread->td_ucred);
 790                         if (error != 0)
 791                                 return (error);
 792                         if (ifp->if_flags & IFF_POINTOPOINT)
 793                                 info->rti_info[RTAX_BRD] =
 794                                     nh->nh_ifa->ifa_dstaddr;
 795                         rtm->rtm_index = ifp->if_index;
 796                 } else {
 797                         info->rti_info[RTAX_IFP] = NULL;
 798                         info->rti_info[RTAX_IFA] = NULL;
 799                 }
 800         } else if (ifp != NULL)
 801                 rtm->rtm_index = ifp->if_index;
 802
 803         /* Check if we need to realloc storage */
 804         rtsock_msg_buffer(rtm->rtm_type, info, NULL, &len);
 805         if (len > alloc_len) {
 806                 struct rt_msghdr *tmp_rtm;
 807
 808                 tmp_rtm = malloc(len, M_TEMP, M_NOWAIT);
 809                 if (tmp_rtm == NULL)
 810                         return (ENOBUFS);
 811                 bcopy(rtm, tmp_rtm, rtm->rtm_msglen);
 812                 orig_rtm = rtm;
 813                 rtm = tmp_rtm;
 814                 alloc_len = len;
 815
 816                 /*
 817                  * Delay freeing original rtm as info contains
 818                  * data referencing it.
 819                  */
 820         }
 821
 822         w.w_tmem = (caddr_t)rtm;
 823         w.w_tmemsize = alloc_len;
 824         rtsock_msg_buffer(rtm->rtm_type, info, &w, &len);
 825
 826         if (rt->rt_flags & RTF_GWFLAG_COMPAT)
 827                 rtm->rtm_flags = RTF_GATEWAY |
 828                         (rt->rt_flags & ~RTF_GWFLAG_COMPAT);
 829         else
 830                 rtm->rtm_flags = rt->rt_flags;
 831         rt_getmetrics(rt, &rtm->rtm_rmx);
 832         rtm->rtm_addrs = info->rti_addrs;
 833
 834         if (orig_rtm != NULL)
 835                 free(orig_rtm, M_TEMP);
 836         *prtm = rtm;
 837
 838         return (0);
 839 }
 840
 841 /*ARGSUSED*/
 842 static int
 843 route_output(struct mbuf *m, struct socket *so, ...)
 844 {
 845         struct rt_msghdr *rtm = NULL;
 846         struct rtentry *rt = NULL;
 847         struct rt_addrinfo info;
 848         struct epoch_tracker et;
 849 #ifdef INET6
 850         struct sockaddr_storage ss;
 851         struct sockaddr_in6 *sin6;
 852         int i, rti_need_deembed = 0;
 853 #endif
 854         int alloc_len = 0, len, error = 0, fibnum;
 855         sa_family_t saf = AF_UNSPEC;
 856         struct walkarg w;
 857
 858         fibnum = so->so_fibnum;
 859
 860 #define senderr(e) { error = e; goto flush;}
 861         if (m == NULL || ((m->m_len < sizeof(long)) &&
 862                        (m = m_pullup(m, sizeof(long))) == NULL))
 863                 return (ENOBUFS);
 864         if ((m->m_flags & M_PKTHDR) == 0)
 865                 panic("route_output");
 866         NET_EPOCH_ENTER(et);
 867         len = m->m_pkthdr.len;
 868         if (len < sizeof(*rtm) ||
 869             len != mtod(m, struct rt_msghdr *)->rtm_msglen)
 870                 senderr(EINVAL);
 871
 872         /*
 873          * Most of current messages are in range 200-240 bytes,
 874          * minimize possible re-allocation on reply using larger size
 875          * buffer aligned on 1k boundaty.
 876          */
 877         alloc_len = roundup2(len, 1024);
 878         if ((rtm = malloc(alloc_len, M_TEMP, M_NOWAIT)) == NULL)
 879                 senderr(ENOBUFS);
 880
 881         m_copydata(m, 0, len, (caddr_t)rtm);
 882         bzero(&info, sizeof(info));
 883         bzero(&w, sizeof(w));
 884
 885         if (rtm->rtm_version != RTM_VERSION) {
 886                 /* Do not touch message since format is unknown */
 887                 free(rtm, M_TEMP);
 888                 rtm = NULL;
 889                 senderr(EPROTONOSUPPORT);
 890         }
 891
 892         /*
 893          * Starting from here, it is possible
 894          * to alter original message and insert
 895          * caller PID and error value.
 896          */
 897
 898         if ((error = fill_addrinfo(rtm, len, fibnum, &info)) != 0) {
 899                 senderr(error);
 900         }
 901
 902         saf = info.rti_info[RTAX_DST]->sa_family;
 903
 904         /* support for new ARP code */
 905         if (rtm->rtm_flags & RTF_LLDATA) {
 906                 error = lla_rt_output(rtm, &info);
 907 #ifdef INET6
 908                 if (error == 0)
 909                         rti_need_deembed = (V_deembed_scopeid) ? 1 : 0;
 910 #endif
 911                 goto flush;
 912         }
 913
 914         switch (rtm->rtm_type) {
 915                 struct rtentry *saved_nrt;
 916
 917         case RTM_ADD:
 918         case RTM_CHANGE:
 919                 if (rtm->rtm_type == RTM_ADD) {
 920                         if (info.rti_info[RTAX_GATEWAY] == NULL)
 921                                 senderr(EINVAL);
 922                 }
 923                 saved_nrt = NULL;
 924                 error = rtrequest1_fib(rtm->rtm_type, &info, &saved_nrt,
 925                     fibnum);
 926                 if (error == 0 && saved_nrt != NULL) {
 927 #ifdef INET6
 928                         rti_need_deembed = (V_deembed_scopeid) ? 1 : 0;
 929 #endif
 930                         RT_LOCK(saved_nrt);
 931                         rtm->rtm_index = saved_nrt->rt_nhop->nh_ifp->if_index;
 932                         RT_UNLOCK(saved_nrt);
 933                 }
 934                 break;
 935
 936         case RTM_DELETE:
 937                 saved_nrt = NULL;
 938                 error = rtrequest1_fib(RTM_DELETE, &info, &saved_nrt, fibnum);
 939                 if (error == 0) {
 940                         RT_LOCK(saved_nrt);
 941                         rt = saved_nrt;
 942                         goto report;
 943                 }
 944 #ifdef INET6
 945                 /* rt_msg2() will not be used when RTM_DELETE fails. */
 946                 rti_need_deembed = (V_deembed_scopeid) ? 1 : 0;
 947 #endif
 948                 break;
 949
 950         case RTM_GET:
 951                 error = handle_rtm_get(&info, fibnum, rtm, &rt);
 952                 if (error != 0)
 953                         senderr(error);
 954
 955 report:
 956                 RT_LOCK_ASSERT(rt);
 957                 if (!can_export_rte(curthread->td_ucred, rt)) {
 958                         RT_UNLOCK(rt);
 959                         senderr(ESRCH);
 960                 }
 961                 error = update_rtm_from_rte(&info, &rtm, alloc_len, rt);
 962                 /*
 963                  * Note that some sockaddr pointers may have changed to
 964                  * point to memory outsize @rtm. Some may be pointing
 965                  * to the on-stack variables.
 966                  * Given that, any pointer in @info CANNOT BE USED.
 967                  */
 968
 969                 /*
 970                  * scopeid deembedding has been performed while
 971                  * writing updated rtm in rtsock_msg_buffer().
 972                  * With that in mind, skip deembedding procedure below.
 973                  */
 974 #ifdef INET6
 975                 rti_need_deembed = 0;
 976 #endif
 977                 RT_UNLOCK(rt);
 978                 if (error != 0)
 979                         senderr(error);
 980                 break;
 981
 982         default:
 983                 senderr(EOPNOTSUPP);
 984         }
 985
 986 flush:
 987         NET_EPOCH_EXIT(et);
 988         rt = NULL;
 989
 990 #ifdef INET6
 991         if (rtm != NULL) {
 992                 if (rti_need_deembed) {
 993                         /* sin6_scope_id is recovered before sending rtm. */
 994                         sin6 = (struct sockaddr_in6 *)&ss;
 995                         for (i = 0; i < RTAX_MAX; i++) {
 996                                 if (info.rti_info[i] == NULL)
 997                                         continue;
 998                                 if (info.rti_info[i]->sa_family != AF_INET6)
 999                                         continue;
1000                                 bcopy(info.rti_info[i], sin6, sizeof(*sin6));
1001                                 if (sa6_recoverscope(sin6) == 0)
1002                                         bcopy(sin6, info.rti_info[i],
1003                                                     sizeof(*sin6));
1004                         }
1005                 }
1006         }
1007 #endif
1008         send_rtm_reply(so, rtm, m, saf, fibnum, error);
1009
1010         return (error);
1011 }
1012
1013 /*
1014  * Sends the prepared reply message in @rtm to all rtsock clients.
1015  * Frees @m and @rtm.
1016  *
1017  */
1018 static void
1019 send_rtm_reply(struct socket *so, struct rt_msghdr *rtm, struct mbuf *m,
1020     sa_family_t saf, u_int fibnum, int rtm_errno)
1021 {
1022         struct rawcb *rp = NULL;
1023
1024         /*
1025          * Check to see if we don't want our own messages.
1026          */
1027         if ((so->so_options & SO_USELOOPBACK) == 0) {
1028                 if (V_route_cb.any_count <= 1) {
1029                         if (rtm != NULL)
1030                                 free(rtm, M_TEMP);
1031                         m_freem(m);
1032                         return;
1033                 }
1034                 /* There is another listener, so construct message */
1035                 rp = sotorawcb(so);
1036         }
1037
1038         if (rtm != NULL) {
1039                 if (rtm_errno!= 0)
1040                         rtm->rtm_errno = rtm_errno;
1041                 else
1042                         rtm->rtm_flags |= RTF_DONE;
1043
1044                 m_copyback(m, 0, rtm->rtm_msglen, (caddr_t)rtm);
1045                 if (m->m_pkthdr.len < rtm->rtm_msglen) {
1046                         m_freem(m);
1047                         m = NULL;
1048                 } else if (m->m_pkthdr.len > rtm->rtm_msglen)
1049                         m_adj(m, rtm->rtm_msglen - m->m_pkthdr.len);
1050
1051                 free(rtm, M_TEMP);
1052         }
1053         if (m != NULL) {
1054                 M_SETFIB(m, fibnum);
1055                 m->m_flags |= RTS_FILTER_FIB;
1056                 if (rp) {
1057                         /*
1058                          * XXX insure we don't get a copy by
1059                          * invalidating our protocol
1060                          */
1061                         unsigned short family = rp->rcb_proto.sp_family;
1062                         rp->rcb_proto.sp_family = 0;
1063                         rt_dispatch(m, saf);
1064                         rp->rcb_proto.sp_family = family;
1065                 } else
1066                         rt_dispatch(m, saf);
1067         }
1068 }
1069
1070
1071 static void
1072 rt_getmetrics(const struct rtentry *rt, struct rt_metrics *out)
1073 {
1074
1075         bzero(out, sizeof(*out));
1076         out->rmx_mtu = rt->rt_nhop->nh_mtu;
1077         out->rmx_weight = rt->rt_weight;
1078         out->rmx_nhidx = nhop_get_idx(rt->rt_nhop);
1079         /* Kernel -> userland timebase conversion. */
1080         out->rmx_expire = rt->rt_expire ?
1081             rt->rt_expire - time_uptime + time_second : 0;
1082 }
1083
1084 /*
1085  * Extract the addresses of the passed sockaddrs.
1086  * Do a little sanity checking so as to avoid bad memory references.
1087  * This data is derived straight from userland.
1088  */
1089 static int
1090 rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo)
1091 {
1092         struct sockaddr *sa;
1093         int i;
1094
1095         for (i = 0; i < RTAX_MAX && cp < cplim; i++) {
1096                 if ((rtinfo->rti_addrs & (1 << i)) == 0)
1097                         continue;
1098                 sa = (struct sockaddr *)cp;
1099                 /*
1100                  * It won't fit.
1101                  */
1102                 if (cp + sa->sa_len > cplim)
1103                         return (EINVAL);
1104                 /*
1105                  * there are no more.. quit now
1106                  * If there are more bits, they are in error.
1107                  * I've seen this. route(1) can evidently generate these.
1108                  * This causes kernel to core dump.
1109                  * for compatibility, If we see this, point to a safe address.
1110                  */
1111                 if (sa->sa_len == 0) {
1112                         rtinfo->rti_info[i] = &sa_zero;
1113                         return (0); /* should be EINVAL but for compat */
1114                 }
1115                 /* accept it */
1116 #ifdef INET6
1117                 if (sa->sa_family == AF_INET6)
1118                         sa6_embedscope((struct sockaddr_in6 *)sa,
1119                             V_ip6_use_defzone);
1120 #endif
1121                 rtinfo->rti_info[i] = sa;
1122                 cp += SA_SIZE(sa);
1123         }
1124         return (0);
1125 }
1126
1127 /*
1128  * Fill in @dmask with valid netmask leaving original @smask
1129  * intact. Mostly used with radix netmasks.
1130  */
1131 struct sockaddr *
1132 rtsock_fix_netmask(const struct sockaddr *dst, const struct sockaddr *smask,
1133     struct sockaddr_storage *dmask)
1134 {
1135         if (dst == NULL || smask == NULL)
1136                 return (NULL);
1137
1138         memset(dmask, 0, dst->sa_len);
1139         memcpy(dmask, smask, smask->sa_len);
1140         dmask->ss_len = dst->sa_len;
1141         dmask->ss_family = dst->sa_family;
1142
1143         return ((struct sockaddr *)dmask);
1144 }
1145
1146 /*
1147  * Writes information related to @rtinfo object to newly-allocated mbuf.
1148  * Assumes MCLBYTES is enough to construct any message.
1149  * Used for OS notifications of vaious events (if/ifa announces,etc)
1150  *
1151  * Returns allocated mbuf or NULL on failure.
1152  */
1153 static struct mbuf *
1154 rtsock_msg_mbuf(int type, struct rt_addrinfo *rtinfo)
1155 {
1156         struct rt_msghdr *rtm;
1157         struct mbuf *m;
1158         int i;
1159         struct sockaddr *sa;
1160 #ifdef INET6
1161         struct sockaddr_storage ss;
1162         struct sockaddr_in6 *sin6;
1163 #endif
1164         int len, dlen;
1165
1166         switch (type) {
1167
1168         case RTM_DELADDR:
1169         case RTM_NEWADDR:
1170                 len = sizeof(struct ifa_msghdr);
1171                 break;
1172
1173         case RTM_DELMADDR:
1174         case RTM_NEWMADDR:
1175                 len = sizeof(struct ifma_msghdr);
1176                 break;
1177
1178         case RTM_IFINFO:
1179                 len = sizeof(struct if_msghdr);
1180                 break;
1181
1182         case RTM_IFANNOUNCE:
1183         case RTM_IEEE80211:
1184                 len = sizeof(struct if_announcemsghdr);
1185                 break;
1186
1187         default:
1188                 len = sizeof(struct rt_msghdr);
1189         }
1190
1191         /* XXXGL: can we use MJUMPAGESIZE cluster here? */
1192         KASSERT(len <= MCLBYTES, ("%s: message too big", __func__));
1193         if (len > MHLEN)
1194                 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
1195         else
1196                 m = m_gethdr(M_NOWAIT, MT_DATA);
1197         if (m == NULL)
1198                 return (m);
1199
1200         m->m_pkthdr.len = m->m_len = len;
1201         rtm = mtod(m, struct rt_msghdr *);
1202         bzero((caddr_t)rtm, len);
1203         for (i = 0; i < RTAX_MAX; i++) {
1204                 if ((sa = rtinfo->rti_info[i]) == NULL)
1205                         continue;
1206                 rtinfo->rti_addrs |= (1 << i);
1207                 dlen = SA_SIZE(sa);
1208 #ifdef INET6
1209                 if (V_deembed_scopeid && sa->sa_family == AF_INET6) {
1210                         sin6 = (struct sockaddr_in6 *)&ss;
1211                         bcopy(sa, sin6, sizeof(*sin6));
1212                         if (sa6_recoverscope(sin6) == 0)
1213                                 sa = (struct sockaddr *)sin6;
1214                 }
1215 #endif
1216                 m_copyback(m, len, dlen, (caddr_t)sa);
1217                 len += dlen;
1218         }
1219         if (m->m_pkthdr.len != len) {
1220                 m_freem(m);
1221                 return (NULL);
1222         }
1223         rtm->rtm_msglen = len;
1224         rtm->rtm_version = RTM_VERSION;
1225         rtm->rtm_type = type;
1226         return (m);
1227 }
1228
1229 /*
1230  * Writes information related to @rtinfo object to preallocated buffer.
1231  * Stores needed size in @plen. If @w is NULL, calculates size without
1232  * writing.
1233  * Used for sysctl dumps and rtsock answers (RTM_DEL/RTM_GET) generation.
1234  *
1235  * Returns 0 on success.
1236  *
1237  */
1238 static int
1239 rtsock_msg_buffer(int type, struct rt_addrinfo *rtinfo, struct walkarg *w, int *plen)
1240 {
1241         int i;
1242         int len, buflen = 0, dlen;
1243         caddr_t cp = NULL;
1244         struct rt_msghdr *rtm = NULL;
1245 #ifdef INET6
1246         struct sockaddr_storage ss;
1247         struct sockaddr_in6 *sin6;
1248 #endif
1249 #ifdef COMPAT_FREEBSD32
1250         bool compat32 = false;
1251 #endif
1252
1253         switch (type) {
1254
1255         case RTM_DELADDR:
1256         case RTM_NEWADDR:
1257                 if (w != NULL && w->w_op == NET_RT_IFLISTL) {
1258 #ifdef COMPAT_FREEBSD32
1259                         if (w->w_req->flags & SCTL_MASK32) {
1260                                 len = sizeof(struct ifa_msghdrl32);
1261                                 compat32 = true;
1262                         } else
1263 #endif
1264                                 len = sizeof(struct ifa_msghdrl);
1265                 } else
1266                         len = sizeof(struct ifa_msghdr);
1267                 break;
1268
1269         case RTM_IFINFO:
1270 #ifdef COMPAT_FREEBSD32
1271                 if (w != NULL && w->w_req->flags & SCTL_MASK32) {
1272                         if (w->w_op == NET_RT_IFLISTL)
1273                                 len = sizeof(struct if_msghdrl32);
1274                         else
1275                                 len = sizeof(struct if_msghdr32);
1276                         compat32 = true;
1277                         break;
1278                 }
1279 #endif
1280                 if (w != NULL && w->w_op == NET_RT_IFLISTL)
1281                         len = sizeof(struct if_msghdrl);
1282                 else
1283                         len = sizeof(struct if_msghdr);
1284                 break;
1285
1286         case RTM_NEWMADDR:
1287                 len = sizeof(struct ifma_msghdr);
1288                 break;
1289
1290         default:
1291                 len = sizeof(struct rt_msghdr);
1292         }
1293
1294         if (w != NULL) {
1295                 rtm = (struct rt_msghdr *)w->w_tmem;
1296                 buflen = w->w_tmemsize - len;
1297                 cp = (caddr_t)w->w_tmem + len;
1298         }
1299
1300         rtinfo->rti_addrs = 0;
1301         for (i = 0; i < RTAX_MAX; i++) {
1302                 struct sockaddr *sa;
1303
1304                 if ((sa = rtinfo->rti_info[i]) == NULL)
1305                         continue;
1306                 rtinfo->rti_addrs |= (1 << i);
1307 #ifdef COMPAT_FREEBSD32
1308                 if (compat32)
1309                         dlen = SA_SIZE32(sa);
1310                 else
1311 #endif
1312                         dlen = SA_SIZE(sa);
1313                 if (cp != NULL && buflen >= dlen) {
1314 #ifdef INET6
1315                         if (V_deembed_scopeid && sa->sa_family == AF_INET6) {
1316                                 sin6 = (struct sockaddr_in6 *)&ss;
1317                                 bcopy(sa, sin6, sizeof(*sin6));
1318                                 if (sa6_recoverscope(sin6) == 0)
1319                                         sa = (struct sockaddr *)sin6;
1320                         }
1321 #endif
1322                         bcopy((caddr_t)sa, cp, (unsigned)dlen);
1323                         cp += dlen;
1324                         buflen -= dlen;
1325                 } else if (cp != NULL) {
1326                         /*
1327                          * Buffer too small. Count needed size
1328                          * and return with error.
1329                          */
1330                         cp = NULL;
1331                 }
1332
1333                 len += dlen;
1334         }
1335
1336         if (cp != NULL) {
1337                 dlen = ALIGN(len) - len;
1338                 if (buflen < dlen)
1339                         cp = NULL;
1340                 else {
1341                         bzero(cp, dlen);
1342                         cp += dlen;
1343                         buflen -= dlen;
1344                 }
1345         }
1346         len = ALIGN(len);
1347
1348         if (cp != NULL) {
1349                 /* fill header iff buffer is large enough */
1350                 rtm->rtm_version = RTM_VERSION;
1351                 rtm->rtm_type = type;
1352                 rtm->rtm_msglen = len;
1353         }
1354
1355         *plen = len;
1356
1357         if (w != NULL && cp == NULL)
1358                 return (ENOBUFS);
1359
1360         return (0);
1361 }
1362
1363 /*
1364  * This routine is called to generate a message from the routing
1365  * socket indicating that a redirect has occurred, a routing lookup
1366  * has failed, or that a protocol has detected timeouts to a particular
1367  * destination.
1368  */
1369 void
1370 rt_missmsg_fib(int type, struct rt_addrinfo *rtinfo, int flags, int error,
1371     int fibnum)
1372 {
1373         struct rt_msghdr *rtm;
1374         struct mbuf *m;
1375         struct sockaddr *sa = rtinfo->rti_info[RTAX_DST];
1376
1377         if (V_route_cb.any_count == 0)
1378                 return;
1379         m = rtsock_msg_mbuf(type, rtinfo);
1380         if (m == NULL)
1381                 return;
1382
1383         if (fibnum != RT_ALL_FIBS) {
1384                 KASSERT(fibnum >= 0 && fibnum < rt_numfibs, ("%s: fibnum out "
1385                     "of range 0 <= %d < %d", __func__, fibnum, rt_numfibs));
1386                 M_SETFIB(m, fibnum);
1387                 m->m_flags |= RTS_FILTER_FIB;
1388         }
1389
1390         rtm = mtod(m, struct rt_msghdr *);
1391         rtm->rtm_flags = RTF_DONE | flags;
1392         rtm->rtm_errno = error;
1393         rtm->rtm_addrs = rtinfo->rti_addrs;
1394         rt_dispatch(m, sa ? sa->sa_family : AF_UNSPEC);
1395 }
1396
1397 void
1398 rt_missmsg(int type, struct rt_addrinfo *rtinfo, int flags, int error)
1399 {
1400
1401         rt_missmsg_fib(type, rtinfo, flags, error, RT_ALL_FIBS);
1402 }
1403
1404 /*
1405  * This routine is called to generate a message from the routing
1406  * socket indicating that the status of a network interface has changed.
1407  */
1408 void
1409 rt_ifmsg(struct ifnet *ifp)
1410 {
1411         struct if_msghdr *ifm;
1412         struct mbuf *m;
1413         struct rt_addrinfo info;
1414
1415         if (V_route_cb.any_count == 0)
1416                 return;
1417         bzero((caddr_t)&info, sizeof(info));
1418         m = rtsock_msg_mbuf(RTM_IFINFO, &info);
1419         if (m == NULL)
1420                 return;
1421         ifm = mtod(m, struct if_msghdr *);
1422         ifm->ifm_index = ifp->if_index;
1423         ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
1424         if_data_copy(ifp, &ifm->ifm_data);
1425         ifm->ifm_addrs = 0;
1426         rt_dispatch(m, AF_UNSPEC);
1427 }
1428
1429 /*
1430  * Announce interface address arrival/withdraw.
1431  * Please do not call directly, use rt_addrmsg().
1432  * Assume input data to be valid.
1433  * Returns 0 on success.
1434  */
1435 int
1436 rtsock_addrmsg(int cmd, struct ifaddr *ifa, int fibnum)
1437 {
1438         struct rt_addrinfo info;
1439         struct sockaddr *sa;
1440         int ncmd;
1441         struct mbuf *m;
1442         struct ifa_msghdr *ifam;
1443         struct ifnet *ifp = ifa->ifa_ifp;
1444         struct sockaddr_storage ss;
1445
1446         if (V_route_cb.any_count == 0)
1447                 return (0);
1448
1449         ncmd = cmd == RTM_ADD ? RTM_NEWADDR : RTM_DELADDR;
1450
1451         bzero((caddr_t)&info, sizeof(info));
1452         info.rti_info[RTAX_IFA] = sa = ifa->ifa_addr;
1453         info.rti_info[RTAX_IFP] = ifp->if_addr->ifa_addr;
1454         info.rti_info[RTAX_NETMASK] = rtsock_fix_netmask(
1455             info.rti_info[RTAX_IFA], ifa->ifa_netmask, &ss);
1456         info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr;
1457         if ((m = rtsock_msg_mbuf(ncmd, &info)) == NULL)
1458                 return (ENOBUFS);
1459         ifam = mtod(m, struct ifa_msghdr *);
1460         ifam->ifam_index = ifp->if_index;
1461         ifam->ifam_metric = ifa->ifa_ifp->if_metric;
1462         ifam->ifam_flags = ifa->ifa_flags;
1463         ifam->ifam_addrs = info.rti_addrs;
1464
1465         if (fibnum != RT_ALL_FIBS) {
1466                 M_SETFIB(m, fibnum);
1467                 m->m_flags |= RTS_FILTER_FIB;
1468         }
1469
1470         rt_dispatch(m, sa ? sa->sa_family : AF_UNSPEC);
1471
1472         return (0);
1473 }
1474
1475 /*
1476  * Announce route addition/removal to rtsock based on @rt data.
1477  * Callers are advives to use rt_routemsg() instead of using this
1478  *  function directly.
1479  * Assume @rt data is consistent.
1480  *
1481  * Returns 0 on success.
1482  */
1483 int
1484 rtsock_routemsg(int cmd, struct rtentry *rt, struct ifnet *ifp, int rti_addrs,
1485     int fibnum)
1486 {
1487         struct sockaddr_storage ss;
1488         struct rt_addrinfo info;
1489
1490         if (V_route_cb.any_count == 0)
1491                 return (0);
1492
1493         bzero((caddr_t)&info, sizeof(info));
1494         info.rti_info[RTAX_DST] = rt_key(rt);
1495         info.rti_info[RTAX_NETMASK] = rtsock_fix_netmask(rt_key(rt), rt_mask(rt), &ss);
1496         info.rti_info[RTAX_GATEWAY] = &rt->rt_nhop->gw_sa;
1497         info.rti_flags = rt->rt_flags;
1498         info.rti_ifp = ifp;
1499
1500         return (rtsock_routemsg_info(cmd, &info, fibnum));
1501 }
1502
1503 int
1504 rtsock_routemsg_info(int cmd, struct rt_addrinfo *info, int fibnum)
1505 {
1506         struct rt_msghdr *rtm;
1507         struct sockaddr *sa;
1508         struct mbuf *m;
1509
1510         if (V_route_cb.any_count == 0)
1511                 return (0);
1512
1513         if (info->rti_flags & RTF_HOST)
1514                 info->rti_info[RTAX_NETMASK] = NULL;
1515
1516         m = rtsock_msg_mbuf(cmd, info);
1517         if (m == NULL)
1518                 return (ENOBUFS);
1519
1520         if (fibnum != RT_ALL_FIBS) {
1521                 KASSERT(fibnum >= 0 && fibnum < rt_numfibs, ("%s: fibnum out "
1522                     "of range 0 <= %d < %d", __func__, fibnum, rt_numfibs));
1523                 M_SETFIB(m, fibnum);
1524                 m->m_flags |= RTS_FILTER_FIB;
1525         }
1526
1527         rtm = mtod(m, struct rt_msghdr *);
1528         rtm->rtm_addrs = info->rti_addrs;
1529         if (info->rti_ifp != NULL)
1530                 rtm->rtm_index = info->rti_ifp->if_index;
1531         /* Add RTF_DONE to indicate command 'completion' required by API */
1532         info->rti_flags |= RTF_DONE;
1533         /* Reported routes has to be up */
1534         if (cmd == RTM_ADD || cmd == RTM_CHANGE)
1535                 info->rti_flags |= RTF_UP;
1536         rtm->rtm_flags = info->rti_flags;
1537
1538         sa = info->rti_info[RTAX_DST];
1539         rt_dispatch(m, sa ? sa->sa_family : AF_UNSPEC);
1540
1541         return (0);
1542 }
1543
1544 /*
1545  * This is the analogue to the rt_newaddrmsg which performs the same
1546  * function but for multicast group memberhips.  This is easier since
1547  * there is no route state to worry about.
1548  */
1549 void
1550 rt_newmaddrmsg(int cmd, struct ifmultiaddr *ifma)
1551 {
1552         struct rt_addrinfo info;
1553         struct mbuf *m = NULL;
1554         struct ifnet *ifp = ifma->ifma_ifp;
1555         struct ifma_msghdr *ifmam;
1556
1557         if (V_route_cb.any_count == 0)
1558                 return;
1559
1560         bzero((caddr_t)&info, sizeof(info));
1561         info.rti_info[RTAX_IFA] = ifma->ifma_addr;
1562         if (ifp && ifp->if_addr)
1563                 info.rti_info[RTAX_IFP] = ifp->if_addr->ifa_addr;
1564         else
1565                 info.rti_info[RTAX_IFP] = NULL;
1566         /*
1567          * If a link-layer address is present, present it as a ``gateway''
1568          * (similarly to how ARP entries, e.g., are presented).
1569          */
1570         info.rti_info[RTAX_GATEWAY] = ifma->ifma_lladdr;
1571         m = rtsock_msg_mbuf(cmd, &info);
1572         if (m == NULL)
1573                 return;
1574         ifmam = mtod(m, struct ifma_msghdr *);
1575         KASSERT(ifp != NULL, ("%s: link-layer multicast address w/o ifp\n",
1576             __func__));
1577         ifmam->ifmam_index = ifp->if_index;
1578         ifmam->ifmam_addrs = info.rti_addrs;
1579         rt_dispatch(m, ifma->ifma_addr ? ifma->ifma_addr->sa_family : AF_UNSPEC);
1580 }
1581
1582 static struct mbuf *
1583 rt_makeifannouncemsg(struct ifnet *ifp, int type, int what,
1584         struct rt_addrinfo *info)
1585 {
1586         struct if_announcemsghdr *ifan;
1587         struct mbuf *m;
1588
1589         if (V_route_cb.any_count == 0)
1590                 return NULL;
1591         bzero((caddr_t)info, sizeof(*info));
1592         m = rtsock_msg_mbuf(type, info);
1593         if (m != NULL) {
1594                 ifan = mtod(m, struct if_announcemsghdr *);
1595                 ifan->ifan_index = ifp->if_index;
1596                 strlcpy(ifan->ifan_name, ifp->if_xname,
1597                         sizeof(ifan->ifan_name));
1598                 ifan->ifan_what = what;
1599         }
1600         return m;
1601 }
1602
1603 /*
1604  * This is called to generate routing socket messages indicating
1605  * IEEE80211 wireless events.
1606  * XXX we piggyback on the RTM_IFANNOUNCE msg format in a clumsy way.
1607  */
1608 void
1609 rt_ieee80211msg(struct ifnet *ifp, int what, void *data, size_t data_len)
1610 {
1611         struct mbuf *m;
1612         struct rt_addrinfo info;
1613
1614         m = rt_makeifannouncemsg(ifp, RTM_IEEE80211, what, &info);
1615         if (m != NULL) {
1616                 /*
1617                  * Append the ieee80211 data.  Try to stick it in the
1618                  * mbuf containing the ifannounce msg; otherwise allocate
1619                  * a new mbuf and append.
1620                  *
1621                  * NB: we assume m is a single mbuf.
1622                  */
1623                 if (data_len > M_TRAILINGSPACE(m)) {
1624                         struct mbuf *n = m_get(M_NOWAIT, MT_DATA);
1625                         if (n == NULL) {
1626                                 m_freem(m);
1627                                 return;
1628                         }
1629                         bcopy(data, mtod(n, void *), data_len);
1630                         n->m_len = data_len;
1631                         m->m_next = n;
1632                 } else if (data_len > 0) {
1633                         bcopy(data, mtod(m, u_int8_t *) + m->m_len, data_len);
1634                         m->m_len += data_len;
1635                 }
1636                 if (m->m_flags & M_PKTHDR)
1637                         m->m_pkthdr.len += data_len;
1638                 mtod(m, struct if_announcemsghdr *)->ifan_msglen += data_len;
1639                 rt_dispatch(m, AF_UNSPEC);
1640         }
1641 }
1642
1643 /*
1644  * This is called to generate routing socket messages indicating
1645  * network interface arrival and departure.
1646  */
1647 void
1648 rt_ifannouncemsg(struct ifnet *ifp, int what)
1649 {
1650         struct mbuf *m;
1651         struct rt_addrinfo info;
1652
1653         m = rt_makeifannouncemsg(ifp, RTM_IFANNOUNCE, what, &info);
1654         if (m != NULL)
1655                 rt_dispatch(m, AF_UNSPEC);
1656 }
1657
1658 static void
1659 rt_dispatch(struct mbuf *m, sa_family_t saf)
1660 {
1661         struct m_tag *tag;
1662
1663         /*
1664          * Preserve the family from the sockaddr, if any, in an m_tag for
1665          * use when injecting the mbuf into the routing socket buffer from
1666          * the netisr.
1667          */
1668         if (saf != AF_UNSPEC) {
1669                 tag = m_tag_get(PACKET_TAG_RTSOCKFAM, sizeof(unsigned short),
1670                     M_NOWAIT);
1671                 if (tag == NULL) {
1672                         m_freem(m);
1673                         return;
1674                 }
1675                 *(unsigned short *)(tag + 1) = saf;
1676                 m_tag_prepend(m, tag);
1677         }
1678 #ifdef VIMAGE
1679         if (V_loif)
1680                 m->m_pkthdr.rcvif = V_loif;
1681         else {
1682                 m_freem(m);
1683                 return;
1684         }
1685 #endif
1686         netisr_queue(NETISR_ROUTE, m);  /* mbuf is free'd on failure. */
1687 }
1688
1689 /*
1690  * Checks if rte can be exported v.r.t jails/vnets.
1691  *
1692  * Returns 1 if it can, 0 otherwise.
1693  */
1694 static int
1695 can_export_rte(struct ucred *td_ucred, const struct rtentry *rt)
1696 {
1697
1698         if ((rt->rt_flags & RTF_HOST) == 0
1699             ? jailed_without_vnet(td_ucred)
1700             : prison_if(td_ucred, rt_key_const(rt)) != 0)
1701                 return (0);
1702         return (1);
1703 }
1704
1705 /*
1706  * This is used in dumping the kernel table via sysctl().
1707  */
1708 static int
1709 sysctl_dumpentry(struct radix_node *rn, void *vw)
1710 {
1711         struct walkarg *w = vw;
1712         struct rtentry *rt = (struct rtentry *)rn;
1713         struct nhop_object *nh;
1714         int error = 0, size;
1715         struct rt_addrinfo info;
1716         struct sockaddr_storage ss;
1717
1718         NET_EPOCH_ASSERT();
1719
1720         if (w->w_op == NET_RT_FLAGS && !(rt->rt_flags & w->w_arg))
1721                 return 0;
1722         if (!can_export_rte(w->w_req->td->td_ucred, rt))
1723                 return (0);
1724         bzero((caddr_t)&info, sizeof(info));
1725         info.rti_info[RTAX_DST] = rt_key(rt);
1726         info.rti_info[RTAX_GATEWAY] = &rt->rt_nhop->gw_sa;
1727         info.rti_info[RTAX_NETMASK] = rtsock_fix_netmask(rt_key(rt),
1728             rt_mask(rt), &ss);
1729         info.rti_info[RTAX_GENMASK] = 0;
1730         nh = rt->rt_nhop;
1731         if (nh->nh_ifp && !(nh->nh_ifp->if_flags & IFF_DYING)) {
1732                 info.rti_info[RTAX_IFP] = nh->nh_ifp->if_addr->ifa_addr;
1733                 info.rti_info[RTAX_IFA] = nh->nh_ifa->ifa_addr;
1734                 if (nh->nh_ifp->if_flags & IFF_POINTOPOINT)
1735                         info.rti_info[RTAX_BRD] = nh->nh_ifa->ifa_dstaddr;
1736         }
1737         if ((error = rtsock_msg_buffer(RTM_GET, &info, w, &size)) != 0)
1738                 return (error);
1739         if (w->w_req && w->w_tmem) {
1740                 struct rt_msghdr *rtm = (struct rt_msghdr *)w->w_tmem;
1741
1742                 bzero(&rtm->rtm_index,
1743                     sizeof(*rtm) - offsetof(struct rt_msghdr, rtm_index));
1744                 if (rt->rt_flags & RTF_GWFLAG_COMPAT)
1745                         rtm->rtm_flags = RTF_GATEWAY |
1746                                 (rt->rt_flags & ~RTF_GWFLAG_COMPAT);
1747                 else
1748                         rtm->rtm_flags = rt->rt_flags;
1749                 rtm->rtm_flags |= nhop_get_rtflags(nh);
1750                 rt_getmetrics(rt, &rtm->rtm_rmx);
1751                 rtm->rtm_index = nh->nh_ifp->if_index;
1752                 rtm->rtm_addrs = info.rti_addrs;
1753                 error = SYSCTL_OUT(w->w_req, (caddr_t)rtm, size);
1754                 return (error);
1755         }
1756         return (error);
1757 }
1758
1759 static int
1760 sysctl_iflist_ifml(struct ifnet *ifp, const struct if_data *src_ifd,
1761     struct rt_addrinfo *info, struct walkarg *w, int len)
1762 {
1763         struct if_msghdrl *ifm;
1764         struct if_data *ifd;
1765
1766         ifm = (struct if_msghdrl *)w->w_tmem;
1767
1768 #ifdef COMPAT_FREEBSD32
1769         if (w->w_req->flags & SCTL_MASK32) {
1770                 struct if_msghdrl32 *ifm32;
1771
1772                 ifm32 = (struct if_msghdrl32 *)ifm;
1773                 ifm32->ifm_addrs = info->rti_addrs;
1774                 ifm32->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
1775                 ifm32->ifm_index = ifp->if_index;
1776                 ifm32->_ifm_spare1 = 0;
1777                 ifm32->ifm_len = sizeof(*ifm32);
1778                 ifm32->ifm_data_off = offsetof(struct if_msghdrl32, ifm_data);
1779                 ifm32->_ifm_spare2 = 0;
1780                 ifd = &ifm32->ifm_data;
1781         } else
1782 #endif
1783         {
1784                 ifm->ifm_addrs = info->rti_addrs;
1785                 ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
1786                 ifm->ifm_index = ifp->if_index;
1787                 ifm->_ifm_spare1 = 0;
1788                 ifm->ifm_len = sizeof(*ifm);
1789                 ifm->ifm_data_off = offsetof(struct if_msghdrl, ifm_data);
1790                 ifm->_ifm_spare2 = 0;
1791                 ifd = &ifm->ifm_data;
1792         }
1793
1794         memcpy(ifd, src_ifd, sizeof(*ifd));
1795
1796         return (SYSCTL_OUT(w->w_req, (caddr_t)ifm, len));
1797 }
1798
1799 static int
1800 sysctl_iflist_ifm(struct ifnet *ifp, const struct if_data *src_ifd,
1801     struct rt_addrinfo *info, struct walkarg *w, int len)
1802 {
1803         struct if_msghdr *ifm;
1804         struct if_data *ifd;
1805
1806         ifm = (struct if_msghdr *)w->w_tmem;
1807
1808 #ifdef COMPAT_FREEBSD32
1809         if (w->w_req->flags & SCTL_MASK32) {
1810                 struct if_msghdr32 *ifm32;
1811
1812                 ifm32 = (struct if_msghdr32 *)ifm;
1813                 ifm32->ifm_addrs = info->rti_addrs;
1814                 ifm32->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
1815                 ifm32->ifm_index = ifp->if_index;
1816                 ifm32->_ifm_spare1 = 0;
1817                 ifd = &ifm32->ifm_data;
1818         } else
1819 #endif
1820         {
1821                 ifm->ifm_addrs = info->rti_addrs;
1822                 ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
1823                 ifm->ifm_index = ifp->if_index;
1824                 ifm->_ifm_spare1 = 0;
1825                 ifd = &ifm->ifm_data;
1826         }
1827
1828         memcpy(ifd, src_ifd, sizeof(*ifd));
1829
1830         return (SYSCTL_OUT(w->w_req, (caddr_t)ifm, len));
1831 }
1832
1833 static int
1834 sysctl_iflist_ifaml(struct ifaddr *ifa, struct rt_addrinfo *info,
1835     struct walkarg *w, int len)
1836 {
1837         struct ifa_msghdrl *ifam;
1838         struct if_data *ifd;
1839
1840         ifam = (struct ifa_msghdrl *)w->w_tmem;
1841
1842 #ifdef COMPAT_FREEBSD32
1843         if (w->w_req->flags & SCTL_MASK32) {
1844                 struct ifa_msghdrl32 *ifam32;
1845
1846                 ifam32 = (struct ifa_msghdrl32 *)ifam;
1847                 ifam32->ifam_addrs = info->rti_addrs;
1848                 ifam32->ifam_flags = ifa->ifa_flags;
1849                 ifam32->ifam_index = ifa->ifa_ifp->if_index;
1850                 ifam32->_ifam_spare1 = 0;
1851                 ifam32->ifam_len = sizeof(*ifam32);
1852                 ifam32->ifam_data_off =
1853                     offsetof(struct ifa_msghdrl32, ifam_data);
1854                 ifam32->ifam_metric = ifa->ifa_ifp->if_metric;
1855                 ifd = &ifam32->ifam_data;
1856         } else
1857 #endif
1858         {
1859                 ifam->ifam_addrs = info->rti_addrs;
1860                 ifam->ifam_flags = ifa->ifa_flags;
1861                 ifam->ifam_index = ifa->ifa_ifp->if_index;
1862                 ifam->_ifam_spare1 = 0;
1863                 ifam->ifam_len = sizeof(*ifam);
1864                 ifam->ifam_data_off = offsetof(struct ifa_msghdrl, ifam_data);
1865                 ifam->ifam_metric = ifa->ifa_ifp->if_metric;
1866                 ifd = &ifam->ifam_data;
1867         }
1868
1869         bzero(ifd, sizeof(*ifd));
1870         ifd->ifi_datalen = sizeof(struct if_data);
1871         ifd->ifi_ipackets = counter_u64_fetch(ifa->ifa_ipackets);
1872         ifd->ifi_opackets = counter_u64_fetch(ifa->ifa_opackets);
1873         ifd->ifi_ibytes = counter_u64_fetch(ifa->ifa_ibytes);
1874         ifd->ifi_obytes = counter_u64_fetch(ifa->ifa_obytes);
1875
1876         /* Fixup if_data carp(4) vhid. */
1877         if (carp_get_vhid_p != NULL)
1878                 ifd->ifi_vhid = (*carp_get_vhid_p)(ifa);
1879
1880         return (SYSCTL_OUT(w->w_req, w->w_tmem, len));
1881 }
1882
1883 static int
1884 sysctl_iflist_ifam(struct ifaddr *ifa, struct rt_addrinfo *info,
1885     struct walkarg *w, int len)
1886 {
1887         struct ifa_msghdr *ifam;
1888
1889         ifam = (struct ifa_msghdr *)w->w_tmem;
1890         ifam->ifam_addrs = info->rti_addrs;
1891         ifam->ifam_flags = ifa->ifa_flags;
1892         ifam->ifam_index = ifa->ifa_ifp->if_index;
1893         ifam->_ifam_spare1 = 0;
1894         ifam->ifam_metric = ifa->ifa_ifp->if_metric;
1895
1896         return (SYSCTL_OUT(w->w_req, w->w_tmem, len));
1897 }
1898
1899 static int
1900 sysctl_iflist(int af, struct walkarg *w)
1901 {
1902         struct ifnet *ifp;
1903         struct ifaddr *ifa;
1904         struct if_data ifd;
1905         struct rt_addrinfo info;
1906         int len, error = 0;
1907         struct sockaddr_storage ss;
1908
1909         bzero((caddr_t)&info, sizeof(info));
1910         bzero(&ifd, sizeof(ifd));
1911         CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1912                 if (w->w_arg && w->w_arg != ifp->if_index)
1913                         continue;
1914                 if_data_copy(ifp, &ifd);
1915                 ifa = ifp->if_addr;
1916                 info.rti_info[RTAX_IFP] = ifa->ifa_addr;
1917                 error = rtsock_msg_buffer(RTM_IFINFO, &info, w, &len);
1918                 if (error != 0)
1919                         goto done;
1920                 info.rti_info[RTAX_IFP] = NULL;
1921                 if (w->w_req && w->w_tmem) {
1922                         if (w->w_op == NET_RT_IFLISTL)
1923                                 error = sysctl_iflist_ifml(ifp, &ifd, &info, w,
1924                                     len);
1925                         else
1926                                 error = sysctl_iflist_ifm(ifp, &ifd, &info, w,
1927                                     len);
1928                         if (error)
1929                                 goto done;
1930                 }
1931                 while ((ifa = CK_STAILQ_NEXT(ifa, ifa_link)) != NULL) {
1932                         if (af && af != ifa->ifa_addr->sa_family)
1933                                 continue;
1934                         if (prison_if(w->w_req->td->td_ucred,
1935                             ifa->ifa_addr) != 0)
1936                                 continue;
1937                         info.rti_info[RTAX_IFA] = ifa->ifa_addr;
1938                         info.rti_info[RTAX_NETMASK] = rtsock_fix_netmask(
1939                             ifa->ifa_addr, ifa->ifa_netmask, &ss);
1940                         info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr;
1941                         error = rtsock_msg_buffer(RTM_NEWADDR, &info, w, &len);
1942                         if (error != 0)
1943                                 goto done;
1944                         if (w->w_req && w->w_tmem) {
1945                                 if (w->w_op == NET_RT_IFLISTL)
1946                                         error = sysctl_iflist_ifaml(ifa, &info,
1947                                             w, len);
1948                                 else
1949                                         error = sysctl_iflist_ifam(ifa, &info,
1950                                             w, len);
1951                                 if (error)
1952                                         goto done;
1953                         }
1954                 }
1955                 info.rti_info[RTAX_IFA] = NULL;
1956                 info.rti_info[RTAX_NETMASK] = NULL;
1957                 info.rti_info[RTAX_BRD] = NULL;
1958         }
1959 done:
1960         return (error);
1961 }
1962
1963 static int
1964 sysctl_ifmalist(int af, struct walkarg *w)
1965 {
1966         struct rt_addrinfo info;
1967         struct ifaddr *ifa;
1968         struct ifmultiaddr *ifma;
1969         struct ifnet *ifp;
1970         int error, len;
1971
1972         NET_EPOCH_ASSERT();
1973
1974         error = 0;
1975         bzero((caddr_t)&info, sizeof(info));
1976
1977         CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1978                 if (w->w_arg && w->w_arg != ifp->if_index)
1979                         continue;
1980                 ifa = ifp->if_addr;
1981                 info.rti_info[RTAX_IFP] = ifa ? ifa->ifa_addr : NULL;
1982                 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1983                         if (af && af != ifma->ifma_addr->sa_family)
1984                                 continue;
1985                         if (prison_if(w->w_req->td->td_ucred,
1986                             ifma->ifma_addr) != 0)
1987                                 continue;
1988                         info.rti_info[RTAX_IFA] = ifma->ifma_addr;
1989                         info.rti_info[RTAX_GATEWAY] =
1990                             (ifma->ifma_addr->sa_family != AF_LINK) ?
1991                             ifma->ifma_lladdr : NULL;
1992                         error = rtsock_msg_buffer(RTM_NEWMADDR, &info, w, &len);
1993                         if (error != 0)
1994                                 break;
1995                         if (w->w_req && w->w_tmem) {
1996                                 struct ifma_msghdr *ifmam;
1997
1998                                 ifmam = (struct ifma_msghdr *)w->w_tmem;
1999                                 ifmam->ifmam_index = ifma->ifma_ifp->if_index;
2000                                 ifmam->ifmam_flags = 0;
2001                                 ifmam->ifmam_addrs = info.rti_addrs;
2002                                 ifmam->_ifmam_spare1 = 0;
2003                                 error = SYSCTL_OUT(w->w_req, w->w_tmem, len);
2004                                 if (error != 0)
2005                                         break;
2006                         }
2007                 }
2008                 if (error != 0)
2009                         break;
2010         }
2011         return (error);
2012 }
2013
2014 static int
2015 sysctl_rtsock(SYSCTL_HANDLER_ARGS)
2016 {
2017         RIB_RLOCK_TRACKER;
2018         struct epoch_tracker et;
2019         int     *name = (int *)arg1;
2020         u_int   namelen = arg2;
2021         struct rib_head *rnh = NULL; /* silence compiler. */
2022         int     i, lim, error = EINVAL;
2023         int     fib = 0;
2024         u_char  af;
2025         struct  walkarg w;
2026
2027         name ++;
2028         namelen--;
2029         if (req->newptr)
2030                 return (EPERM);
2031         if (name[1] == NET_RT_DUMP || name[1] == NET_RT_NHOP) {
2032                 if (namelen == 3)
2033                         fib = req->td->td_proc->p_fibnum;
2034                 else if (namelen == 4)
2035                         fib = (name[3] == RT_ALL_FIBS) ?
2036                             req->td->td_proc->p_fibnum : name[3];
2037                 else
2038                         return ((namelen < 3) ? EISDIR : ENOTDIR);
2039                 if (fib < 0 || fib >= rt_numfibs)
2040                         return (EINVAL);
2041         } else if (namelen != 3)
2042                 return ((namelen < 3) ? EISDIR : ENOTDIR);
2043         af = name[0];
2044         if (af > AF_MAX)
2045                 return (EINVAL);
2046         bzero(&w, sizeof(w));
2047         w.w_op = name[1];
2048         w.w_arg = name[2];
2049         w.w_req = req;
2050
2051         error = sysctl_wire_old_buffer(req, 0);
2052         if (error)
2053                 return (error);
2054
2055         /*
2056          * Allocate reply buffer in advance.
2057          * All rtsock messages has maximum length of u_short.
2058          */
2059         w.w_tmemsize = 65536;
2060         w.w_tmem = malloc(w.w_tmemsize, M_TEMP, M_WAITOK);
2061
2062         NET_EPOCH_ENTER(et);
2063         switch (w.w_op) {
2064         case NET_RT_DUMP:
2065         case NET_RT_FLAGS:
2066                 if (af == 0) {                  /* dump all tables */
2067                         i = 1;
2068                         lim = AF_MAX;
2069                 } else                          /* dump only one table */
2070                         i = lim = af;
2071
2072                 /*
2073                  * take care of llinfo entries, the caller must
2074                  * specify an AF
2075                  */
2076                 if (w.w_op == NET_RT_FLAGS &&
2077                     (w.w_arg == 0 || w.w_arg & RTF_LLINFO)) {
2078                         if (af != 0)
2079                                 error = lltable_sysctl_dumparp(af, w.w_req);
2080                         else
2081                                 error = EINVAL;
2082                         break;
2083                 }
2084                 /*
2085                  * take care of routing entries
2086                  */
2087                 for (error = 0; error == 0 && i <= lim; i++) {
2088                         rnh = rt_tables_get_rnh(fib, i);
2089                         if (rnh != NULL) {
2090                                 RIB_RLOCK(rnh);
2091                                 error = rnh->rnh_walktree(&rnh->head,
2092                                     sysctl_dumpentry, &w);
2093                                 RIB_RUNLOCK(rnh);
2094                         } else if (af != 0)
2095                                 error = EAFNOSUPPORT;
2096                 }
2097                 break;
2098         case NET_RT_NHOP:
2099                 /* Allow dumping one specific af/fib at a time */
2100                 if (namelen < 4) {
2101                         error = EINVAL;
2102                         break;
2103                 }
2104                 fib = name[3];
2105                 if (fib < 0 || fib > rt_numfibs) {
2106                         error = EINVAL;
2107                         break;
2108                 }
2109                 rnh = rt_tables_get_rnh(fib, af);
2110                 if (rnh == NULL) {
2111                         error = EAFNOSUPPORT;
2112                         break;
2113                 }
2114                 if (w.w_op == NET_RT_NHOP)
2115                         error = nhops_dump_sysctl(rnh, w.w_req);
2116                 break;
2117         case NET_RT_IFLIST:
2118         case NET_RT_IFLISTL:
2119                 error = sysctl_iflist(af, &w);
2120                 break;
2121
2122         case NET_RT_IFMALIST:
2123                 error = sysctl_ifmalist(af, &w);
2124                 break;
2125         }
2126         NET_EPOCH_EXIT(et);
2127
2128         free(w.w_tmem, M_TEMP);
2129         return (error);
2130 }
2131
2132 static SYSCTL_NODE(_net, PF_ROUTE, routetable, CTLFLAG_RD | CTLFLAG_MPSAFE,
2133     sysctl_rtsock, "Return route tables and interface/address lists");
2134
2135 /*
2136  * Definitions of protocols supported in the ROUTE domain.
2137  */
2138
2139 static struct domain routedomain;               /* or at least forward */
2140
2141 static struct protosw routesw[] = {
2142 {
2143         .pr_type =              SOCK_RAW,
2144         .pr_domain =            &routedomain,
2145         .pr_flags =             PR_ATOMIC|PR_ADDR,
2146         .pr_output =            route_output,
2147         .pr_ctlinput =          raw_ctlinput,
2148         .pr_init =              raw_init,
2149         .pr_usrreqs =           &route_usrreqs
2150 }
2151 };
2152
2153 static struct domain routedomain = {
2154         .dom_family =           PF_ROUTE,
2155         .dom_name =              "route",
2156         .dom_protosw =          routesw,
2157         .dom_protoswNPROTOSW =  &routesw[nitems(routesw)]
2158 };
2159
2160 VNET_DOMAIN_SET(route);
2161