sys/net/rtsock.c

   1 /*-
   2  * Copyright (c) 1988, 1991, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      @(#)rtsock.c    8.7 (Berkeley) 10/12/95
  30  * $FreeBSD$
  31  */
  32 #include "opt_sctp.h"
  33 #include <sys/param.h>
  34 #include <sys/domain.h>
  35 #include <sys/kernel.h>
  36 #include <sys/jail.h>
  37 #include <sys/malloc.h>
  38 #include <sys/mbuf.h>
  39 #include <sys/priv.h>
  40 #include <sys/proc.h>
  41 #include <sys/protosw.h>
  42 #include <sys/signalvar.h>
  43 #include <sys/socket.h>
  44 #include <sys/socketvar.h>
  45 #include <sys/sysctl.h>
  46 #include <sys/systm.h>
  47
  48 #include <net/if.h>
  49 #include <net/netisr.h>
  50 #include <net/raw_cb.h>
  51 #include <net/route.h>
  52
  53 #include <netinet/in.h>
  54
  55 #ifdef SCTP
  56 extern void sctp_addr_change(struct ifaddr *ifa, int cmd);
  57 #endif /* SCTP */
  58
  59 MALLOC_DEFINE(M_RTABLE, "routetbl", "routing tables");
  60
  61 /* NB: these are not modified */
  62 static struct   sockaddr route_dst = { 2, PF_ROUTE, };
  63 static struct   sockaddr route_src = { 2, PF_ROUTE, };
  64 static struct   sockaddr sa_zero   = { sizeof(sa_zero), AF_INET, };
  65
  66 static struct {
  67         int     ip_count;       /* attached w/ AF_INET */
  68         int     ip6_count;      /* attached w/ AF_INET6 */
  69         int     ipx_count;      /* attached w/ AF_IPX */
  70         int     any_count;      /* total attached */
  71 } route_cb;
  72
  73 struct mtx rtsock_mtx;
  74 MTX_SYSINIT(rtsock, &rtsock_mtx, "rtsock route_cb lock", MTX_DEF);
  75
  76 #define RTSOCK_LOCK()   mtx_lock(&rtsock_mtx)
  77 #define RTSOCK_UNLOCK() mtx_unlock(&rtsock_mtx)
  78 #define RTSOCK_LOCK_ASSERT()    mtx_assert(&rtsock_mtx, MA_OWNED)
  79
  80 static struct   ifqueue rtsintrq;
  81
  82 SYSCTL_NODE(_net, OID_AUTO, route, CTLFLAG_RD, 0, "");
  83 SYSCTL_INT(_net_route, OID_AUTO, netisr_maxqlen, CTLFLAG_RW,
  84     &rtsintrq.ifq_maxlen, 0, "maximum routing socket dispatch queue length");
  85
  86 struct walkarg {
  87         int     w_tmemsize;
  88         int     w_op, w_arg;
  89         caddr_t w_tmem;
  90         struct sysctl_req *w_req;
  91 };
  92
  93 static void     rts_input(struct mbuf *m);
  94 static struct mbuf *rt_msg1(int type, struct rt_addrinfo *rtinfo);
  95 static int      rt_msg2(int type, struct rt_addrinfo *rtinfo,
  96                         caddr_t cp, struct walkarg *w);
  97 static int      rt_xaddrs(caddr_t cp, caddr_t cplim,
  98                         struct rt_addrinfo *rtinfo);
  99 static int      sysctl_dumpentry(struct radix_node *rn, void *vw);
 100 static int      sysctl_iflist(int af, struct walkarg *w);
 101 static int      sysctl_ifmalist(int af, struct walkarg *w);
 102 static int      route_output(struct mbuf *m, struct socket *so);
 103 static void     rt_setmetrics(u_long which, const struct rt_metrics *in,
 104                         struct rt_metrics_lite *out);
 105 static void     rt_getmetrics(const struct rt_metrics_lite *in,
 106                         struct rt_metrics *out);
 107 static void     rt_dispatch(struct mbuf *, const struct sockaddr *);
 108
 109 static void
 110 rts_init(void)
 111 {
 112         int tmp;
 113
 114         rtsintrq.ifq_maxlen = 256;
 115         if (TUNABLE_INT_FETCH("net.route.netisr_maxqlen", &tmp))
 116                 rtsintrq.ifq_maxlen = tmp;
 117         mtx_init(&rtsintrq.ifq_mtx, "rts_inq", NULL, MTX_DEF);
 118         netisr_register(NETISR_ROUTE, rts_input, &rtsintrq, NETISR_MPSAFE);
 119 }
 120 SYSINIT(rtsock, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, rts_init, 0)
 121
 122 static void
 123 rts_input(struct mbuf *m)
 124 {
 125         struct sockproto route_proto;
 126         unsigned short *family;
 127         struct m_tag *tag;
 128
 129         route_proto.sp_family = PF_ROUTE;
 130         tag = m_tag_find(m, PACKET_TAG_RTSOCKFAM, NULL);
 131         if (tag != NULL) {
 132                 family = (unsigned short *)(tag + 1);
 133                 route_proto.sp_protocol = *family;
 134                 m_tag_delete(m, tag);
 135         } else
 136                 route_proto.sp_protocol = 0;
 137
 138         raw_input(m, &route_proto, &route_src, &route_dst);
 139 }
 140
 141 /*
 142  * It really doesn't make any sense at all for this code to share much
 143  * with raw_usrreq.c, since its functionality is so restricted.  XXX
 144  */
 145 static void
 146 rts_abort(struct socket *so)
 147 {
 148
 149         raw_usrreqs.pru_abort(so);
 150 }
 151
 152 static void
 153 rts_close(struct socket *so)
 154 {
 155
 156         raw_usrreqs.pru_close(so);
 157 }
 158
 159 /* pru_accept is EOPNOTSUPP */
 160
 161 static int
 162 rts_attach(struct socket *so, int proto, struct thread *td)
 163 {
 164         struct rawcb *rp;
 165         int s, error;
 166
 167         KASSERT(so->so_pcb == NULL, ("rts_attach: so_pcb != NULL"));
 168
 169         /* XXX */
 170         MALLOC(rp, struct rawcb *, sizeof *rp, M_PCB, M_WAITOK | M_ZERO);
 171         if (rp == NULL)
 172                 return ENOBUFS;
 173
 174         /*
 175          * The splnet() is necessary to block protocols from sending
 176          * error notifications (like RTM_REDIRECT or RTM_LOSING) while
 177          * this PCB is extant but incompletely initialized.
 178          * Probably we should try to do more of this work beforehand and
 179          * eliminate the spl.
 180          */
 181         s = splnet();
 182         so->so_pcb = (caddr_t)rp;
 183         error = raw_attach(so, proto);
 184         rp = sotorawcb(so);
 185         if (error) {
 186                 splx(s);
 187                 so->so_pcb = NULL;
 188                 free(rp, M_PCB);
 189                 return error;
 190         }
 191         RTSOCK_LOCK();
 192         switch(rp->rcb_proto.sp_protocol) {
 193         case AF_INET:
 194                 route_cb.ip_count++;
 195                 break;
 196         case AF_INET6:
 197                 route_cb.ip6_count++;
 198                 break;
 199         case AF_IPX:
 200                 route_cb.ipx_count++;
 201                 break;
 202         }
 203         rp->rcb_faddr = &route_src;
 204         route_cb.any_count++;
 205         RTSOCK_UNLOCK();
 206         soisconnected(so);
 207         so->so_options |= SO_USELOOPBACK;
 208         splx(s);
 209         return 0;
 210 }
 211
 212 static int
 213 rts_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 214 {
 215
 216         return (raw_usrreqs.pru_bind(so, nam, td)); /* xxx just EINVAL */
 217 }
 218
 219 static int
 220 rts_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 221 {
 222
 223         return (raw_usrreqs.pru_connect(so, nam, td)); /* XXX just EINVAL */
 224 }
 225
 226 /* pru_connect2 is EOPNOTSUPP */
 227 /* pru_control is EOPNOTSUPP */
 228
 229 static void
 230 rts_detach(struct socket *so)
 231 {
 232         struct rawcb *rp = sotorawcb(so);
 233
 234         KASSERT(rp != NULL, ("rts_detach: rp == NULL"));
 235
 236         RTSOCK_LOCK();
 237         switch(rp->rcb_proto.sp_protocol) {
 238         case AF_INET:
 239                 route_cb.ip_count--;
 240                 break;
 241         case AF_INET6:
 242                 route_cb.ip6_count--;
 243                 break;
 244         case AF_IPX:
 245                 route_cb.ipx_count--;
 246                 break;
 247         }
 248         route_cb.any_count--;
 249         RTSOCK_UNLOCK();
 250         raw_usrreqs.pru_detach(so);
 251 }
 252
 253 static int
 254 rts_disconnect(struct socket *so)
 255 {
 256
 257         return (raw_usrreqs.pru_disconnect(so));
 258 }
 259
 260 /* pru_listen is EOPNOTSUPP */
 261
 262 static int
 263 rts_peeraddr(struct socket *so, struct sockaddr **nam)
 264 {
 265
 266         return (raw_usrreqs.pru_peeraddr(so, nam));
 267 }
 268
 269 /* pru_rcvd is EOPNOTSUPP */
 270 /* pru_rcvoob is EOPNOTSUPP */
 271
 272 static int
 273 rts_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
 274          struct mbuf *control, struct thread *td)
 275 {
 276
 277         return (raw_usrreqs.pru_send(so, flags, m, nam, control, td));
 278 }
 279
 280 /* pru_sense is null */
 281
 282 static int
 283 rts_shutdown(struct socket *so)
 284 {
 285
 286         return (raw_usrreqs.pru_shutdown(so));
 287 }
 288
 289 static int
 290 rts_sockaddr(struct socket *so, struct sockaddr **nam)
 291 {
 292
 293         return (raw_usrreqs.pru_sockaddr(so, nam));
 294 }
 295
 296 static struct pr_usrreqs route_usrreqs = {
 297         .pru_abort =            rts_abort,
 298         .pru_attach =           rts_attach,
 299         .pru_bind =             rts_bind,
 300         .pru_connect =          rts_connect,
 301         .pru_detach =           rts_detach,
 302         .pru_disconnect =       rts_disconnect,
 303         .pru_peeraddr =         rts_peeraddr,
 304         .pru_send =             rts_send,
 305         .pru_shutdown =         rts_shutdown,
 306         .pru_sockaddr =         rts_sockaddr,
 307         .pru_close =            rts_close,
 308 };
 309
 310 /*ARGSUSED*/
 311 static int
 312 route_output(struct mbuf *m, struct socket *so)
 313 {
 314 #define sa_equal(a1, a2) (bcmp((a1), (a2), (a1)->sa_len) == 0)
 315         struct rt_msghdr *rtm = NULL;
 316         struct rtentry *rt = NULL;
 317         struct radix_node_head *rnh;
 318         struct rt_addrinfo info;
 319         int len, error = 0;
 320         struct ifnet *ifp = NULL;
 321         struct ifaddr *ifa = NULL;
 322         struct sockaddr_in jail;
 323
 324 #define senderr(e) { error = e; goto flush;}
 325         if (m == NULL || ((m->m_len < sizeof(long)) &&
 326                        (m = m_pullup(m, sizeof(long))) == NULL))
 327                 return (ENOBUFS);
 328         if ((m->m_flags & M_PKTHDR) == 0)
 329                 panic("route_output");
 330         len = m->m_pkthdr.len;
 331         if (len < sizeof(*rtm) ||
 332             len != mtod(m, struct rt_msghdr *)->rtm_msglen) {
 333                 info.rti_info[RTAX_DST] = NULL;
 334                 senderr(EINVAL);
 335         }
 336         R_Malloc(rtm, struct rt_msghdr *, len);
 337         if (rtm == NULL) {
 338                 info.rti_info[RTAX_DST] = NULL;
 339                 senderr(ENOBUFS);
 340         }
 341         m_copydata(m, 0, len, (caddr_t)rtm);
 342         if (rtm->rtm_version != RTM_VERSION) {
 343                 info.rti_info[RTAX_DST] = NULL;
 344                 senderr(EPROTONOSUPPORT);
 345         }
 346         rtm->rtm_pid = curproc->p_pid;
 347         bzero(&info, sizeof(info));
 348         info.rti_addrs = rtm->rtm_addrs;
 349         if (rt_xaddrs((caddr_t)(rtm + 1), len + (caddr_t)rtm, &info)) {
 350                 info.rti_info[RTAX_DST] = NULL;
 351                 senderr(EINVAL);
 352         }
 353         info.rti_flags = rtm->rtm_flags;
 354         if (info.rti_info[RTAX_DST] == NULL ||
 355             info.rti_info[RTAX_DST]->sa_family >= AF_MAX ||
 356             (info.rti_info[RTAX_GATEWAY] != NULL &&
 357              info.rti_info[RTAX_GATEWAY]->sa_family >= AF_MAX))
 358                 senderr(EINVAL);
 359         if (info.rti_info[RTAX_GENMASK]) {
 360                 struct radix_node *t;
 361                 t = rn_addmask((caddr_t) info.rti_info[RTAX_GENMASK], 0, 1);
 362                 if (t != NULL &&
 363                     bcmp((char *)(void *)info.rti_info[RTAX_GENMASK] + 1,
 364                     (char *)(void *)t->rn_key + 1,
 365                     ((struct sockaddr *)t->rn_key)->sa_len - 1) == 0)
 366                         info.rti_info[RTAX_GENMASK] =
 367                             (struct sockaddr *)t->rn_key;
 368                 else
 369                         senderr(ENOBUFS);
 370         }
 371
 372         /*
 373          * Verify that the caller has the appropriate privilege; RTM_GET
 374          * is the only operation the non-superuser is allowed.
 375          */
 376         if (rtm->rtm_type != RTM_GET) {
 377                 error = priv_check(curthread, PRIV_NET_ROUTE);
 378                 if (error)
 379                         senderr(error);
 380         }
 381
 382         switch (rtm->rtm_type) {
 383                 struct rtentry *saved_nrt;
 384
 385         case RTM_ADD:
 386                 if (info.rti_info[RTAX_GATEWAY] == NULL)
 387                         senderr(EINVAL);
 388                 saved_nrt = NULL;
 389                 error = rtrequest1(RTM_ADD, &info, &saved_nrt);
 390                 if (error == 0 && saved_nrt) {
 391                         RT_LOCK(saved_nrt);
 392                         rt_setmetrics(rtm->rtm_inits,
 393                                 &rtm->rtm_rmx, &saved_nrt->rt_rmx);
 394                         rtm->rtm_index = saved_nrt->rt_ifp->if_index;
 395                         RT_REMREF(saved_nrt);
 396                         saved_nrt->rt_genmask = info.rti_info[RTAX_GENMASK];
 397                         RT_UNLOCK(saved_nrt);
 398                 }
 399                 break;
 400
 401         case RTM_DELETE:
 402                 saved_nrt = NULL;
 403                 error = rtrequest1(RTM_DELETE, &info, &saved_nrt);
 404                 if (error == 0) {
 405                         RT_LOCK(saved_nrt);
 406                         rt = saved_nrt;
 407                         goto report;
 408                 }
 409                 break;
 410
 411         case RTM_GET:
 412         case RTM_CHANGE:
 413         case RTM_LOCK:
 414                 rnh = rt_tables[info.rti_info[RTAX_DST]->sa_family];
 415                 if (rnh == NULL)
 416                         senderr(EAFNOSUPPORT);
 417                 RADIX_NODE_HEAD_LOCK(rnh);
 418                 rt = (struct rtentry *) rnh->rnh_lookup(info.rti_info[RTAX_DST],
 419                         info.rti_info[RTAX_NETMASK], rnh);
 420                 if (rt == NULL) {       /* XXX looks bogus */
 421                         RADIX_NODE_HEAD_UNLOCK(rnh);
 422                         senderr(ESRCH);
 423                 }
 424                 RT_LOCK(rt);
 425                 RT_ADDREF(rt);
 426                 RADIX_NODE_HEAD_UNLOCK(rnh);
 427
 428                 /*
 429                  * Fix for PR: 82974
 430                  *
 431                  * RTM_CHANGE/LOCK need a perfect match, rn_lookup()
 432                  * returns a perfect match in case a netmask is
 433                  * specified.  For host routes only a longest prefix
 434                  * match is returned so it is necessary to compare the
 435                  * existence of the netmask.  If both have a netmask
 436                  * rnh_lookup() did a perfect match and if none of them
 437                  * have a netmask both are host routes which is also a
 438                  * perfect match.
 439                  */
 440
 441                 if (rtm->rtm_type != RTM_GET &&
 442                     (!rt_mask(rt) != !info.rti_info[RTAX_NETMASK])) {
 443                         RT_UNLOCK(rt);
 444                         senderr(ESRCH);
 445                 }
 446
 447                 switch(rtm->rtm_type) {
 448
 449                 case RTM_GET:
 450                 report:
 451                         RT_LOCK_ASSERT(rt);
 452                         info.rti_info[RTAX_DST] = rt_key(rt);
 453                         info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
 454                         info.rti_info[RTAX_NETMASK] = rt_mask(rt);
 455                         info.rti_info[RTAX_GENMASK] = rt->rt_genmask;
 456                         if (rtm->rtm_addrs & (RTA_IFP | RTA_IFA)) {
 457                                 ifp = rt->rt_ifp;
 458                                 if (ifp) {
 459                                         info.rti_info[RTAX_IFP] =
 460                                             ifp->if_addr->ifa_addr;
 461                                         if (jailed(so->so_cred)) {
 462                                                 bzero(&jail, sizeof(jail));
 463                                                 jail.sin_family = PF_INET;
 464                                                 jail.sin_len = sizeof(jail);
 465                                                 jail.sin_addr.s_addr =
 466                                                 htonl(prison_getip(so->so_cred));
 467                                                 info.rti_info[RTAX_IFA] =
 468                                                     (struct sockaddr *)&jail;
 469                                         } else
 470                                                 info.rti_info[RTAX_IFA] =
 471                                                     rt->rt_ifa->ifa_addr;
 472                                         if (ifp->if_flags & IFF_POINTOPOINT)
 473                                                 info.rti_info[RTAX_BRD] =
 474                                                     rt->rt_ifa->ifa_dstaddr;
 475                                         rtm->rtm_index = ifp->if_index;
 476                                 } else {
 477                                         info.rti_info[RTAX_IFP] = NULL;
 478                                         info.rti_info[RTAX_IFA] = NULL;
 479                                 }
 480                         } else if ((ifp = rt->rt_ifp) != NULL) {
 481                                 rtm->rtm_index = ifp->if_index;
 482                         }
 483                         len = rt_msg2(rtm->rtm_type, &info, NULL, NULL);
 484                         if (len > rtm->rtm_msglen) {
 485                                 struct rt_msghdr *new_rtm;
 486                                 R_Malloc(new_rtm, struct rt_msghdr *, len);
 487                                 if (new_rtm == NULL) {
 488                                         RT_UNLOCK(rt);
 489                                         senderr(ENOBUFS);
 490                                 }
 491                                 bcopy(rtm, new_rtm, rtm->rtm_msglen);
 492                                 Free(rtm); rtm = new_rtm;
 493                         }
 494                         (void)rt_msg2(rtm->rtm_type, &info, (caddr_t)rtm, NULL);
 495                         rtm->rtm_flags = rt->rt_flags;
 496                         rtm->rtm_use = 0;
 497                         rt_getmetrics(&rt->rt_rmx, &rtm->rtm_rmx);
 498                         rtm->rtm_addrs = info.rti_addrs;
 499                         break;
 500
 501                 case RTM_CHANGE:
 502                         /*
 503                          * New gateway could require new ifaddr, ifp;
 504                          * flags may also be different; ifp may be specified
 505                          * by ll sockaddr when protocol address is ambiguous
 506                          */
 507                         if (((rt->rt_flags & RTF_GATEWAY) &&
 508                              info.rti_info[RTAX_GATEWAY] != NULL) ||
 509                             info.rti_info[RTAX_IFP] != NULL ||
 510                             (info.rti_info[RTAX_IFA] != NULL &&
 511                              !sa_equal(info.rti_info[RTAX_IFA],
 512                                        rt->rt_ifa->ifa_addr))) {
 513                                 RT_UNLOCK(rt);
 514                                 if ((error = rt_getifa(&info)) != 0)
 515                                         senderr(error);
 516                                 RT_LOCK(rt);
 517                         }
 518                         if (info.rti_info[RTAX_GATEWAY] != NULL &&
 519                             (error = rt_setgate(rt, rt_key(rt),
 520                                         info.rti_info[RTAX_GATEWAY])) != 0) {
 521                                 RT_UNLOCK(rt);
 522                                 senderr(error);
 523                         }
 524                         if ((ifa = info.rti_ifa) != NULL) {
 525                                 struct ifaddr *oifa = rt->rt_ifa;
 526                                 if (oifa != ifa) {
 527                                         if (oifa) {
 528                                                 if (oifa->ifa_rtrequest)
 529                                                         oifa->ifa_rtrequest(
 530                                                                 RTM_DELETE, rt,
 531                                                                 &info);
 532                                                 IFAFREE(oifa);
 533                                         }
 534                                         IFAREF(ifa);
 535                                         rt->rt_ifa = ifa;
 536                                         rt->rt_ifp = info.rti_ifp;
 537                                 }
 538                         }
 539                         /* Allow some flags to be toggled on change. */
 540                         if (rtm->rtm_fmask & RTF_FMASK)
 541                                 rt->rt_flags = (rt->rt_flags &
 542                                     ~rtm->rtm_fmask) |
 543                                     (rtm->rtm_flags & rtm->rtm_fmask);
 544                         rt_setmetrics(rtm->rtm_inits, &rtm->rtm_rmx,
 545                                         &rt->rt_rmx);
 546                         rtm->rtm_index = rt->rt_ifp->if_index;
 547                         if (rt->rt_ifa && rt->rt_ifa->ifa_rtrequest)
 548                                rt->rt_ifa->ifa_rtrequest(RTM_ADD, rt, &info);
 549                         if (info.rti_info[RTAX_GENMASK])
 550                                 rt->rt_genmask = info.rti_info[RTAX_GENMASK];
 551                         /* FALLTHROUGH */
 552                 case RTM_LOCK:
 553                         /* We don't support locks anymore */
 554                         break;
 555                 }
 556                 RT_UNLOCK(rt);
 557                 break;
 558
 559         default:
 560                 senderr(EOPNOTSUPP);
 561         }
 562
 563 flush:
 564         if (rtm) {
 565                 if (error)
 566                         rtm->rtm_errno = error;
 567                 else
 568                         rtm->rtm_flags |= RTF_DONE;
 569         }
 570         if (rt)         /* XXX can this be true? */
 571                 RTFREE(rt);
 572     {
 573         struct rawcb *rp = NULL;
 574         /*
 575          * Check to see if we don't want our own messages.
 576          */
 577         if ((so->so_options & SO_USELOOPBACK) == 0) {
 578                 if (route_cb.any_count <= 1) {
 579                         if (rtm)
 580                                 Free(rtm);
 581                         m_freem(m);
 582                         return (error);
 583                 }
 584                 /* There is another listener, so construct message */
 585                 rp = sotorawcb(so);
 586         }
 587         if (rtm) {
 588                 m_copyback(m, 0, rtm->rtm_msglen, (caddr_t)rtm);
 589                 if (m->m_pkthdr.len < rtm->rtm_msglen) {
 590                         m_freem(m);
 591                         m = NULL;
 592                 } else if (m->m_pkthdr.len > rtm->rtm_msglen)
 593                         m_adj(m, rtm->rtm_msglen - m->m_pkthdr.len);
 594                 Free(rtm);
 595         }
 596         if (m) {
 597                 if (rp) {
 598                         /*
 599                          * XXX insure we don't get a copy by
 600                          * invalidating our protocol
 601                          */
 602                         unsigned short family = rp->rcb_proto.sp_family;
 603                         rp->rcb_proto.sp_family = 0;
 604                         rt_dispatch(m, info.rti_info[RTAX_DST]);
 605                         rp->rcb_proto.sp_family = family;
 606                 } else
 607                         rt_dispatch(m, info.rti_info[RTAX_DST]);
 608         }
 609     }
 610         return (error);
 611 #undef  sa_equal
 612 }
 613
 614 static void
 615 rt_setmetrics(u_long which, const struct rt_metrics *in,
 616         struct rt_metrics_lite *out)
 617 {
 618 #define metric(f, e) if (which & (f)) out->e = in->e;
 619         /*
 620          * Only these are stored in the routing entry since introduction
 621          * of tcp hostcache. The rest is ignored.
 622          */
 623         metric(RTV_MTU, rmx_mtu);
 624         /* Userland -> kernel timebase conversion. */
 625         if (which & RTV_EXPIRE)
 626                 out->rmx_expire = in->rmx_expire ?
 627                     in->rmx_expire - time_second + time_uptime : 0;
 628 #undef metric
 629 }
 630
 631 static void
 632 rt_getmetrics(const struct rt_metrics_lite *in, struct rt_metrics *out)
 633 {
 634 #define metric(e) out->e = in->e;
 635         bzero(out, sizeof(*out));
 636         metric(rmx_mtu);
 637         /* Kernel -> userland timebase conversion. */
 638         out->rmx_expire = in->rmx_expire ?
 639             in->rmx_expire - time_uptime + time_second : 0;
 640 #undef metric
 641 }
 642
 643 /*
 644  * Extract the addresses of the passed sockaddrs.
 645  * Do a little sanity checking so as to avoid bad memory references.
 646  * This data is derived straight from userland.
 647  */
 648 static int
 649 rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo)
 650 {
 651         struct sockaddr *sa;
 652         int i;
 653
 654         for (i = 0; i < RTAX_MAX && cp < cplim; i++) {
 655                 if ((rtinfo->rti_addrs & (1 << i)) == 0)
 656                         continue;
 657                 sa = (struct sockaddr *)cp;
 658                 /*
 659                  * It won't fit.
 660                  */
 661                 if (cp + sa->sa_len > cplim)
 662                         return (EINVAL);
 663                 /*
 664                  * there are no more.. quit now
 665                  * If there are more bits, they are in error.
 666                  * I've seen this. route(1) can evidently generate these.
 667                  * This causes kernel to core dump.
 668                  * for compatibility, If we see this, point to a safe address.
 669                  */
 670                 if (sa->sa_len == 0) {
 671                         rtinfo->rti_info[i] = &sa_zero;
 672                         return (0); /* should be EINVAL but for compat */
 673                 }
 674                 /* accept it */
 675                 rtinfo->rti_info[i] = sa;
 676                 cp += SA_SIZE(sa);
 677         }
 678         return (0);
 679 }
 680
 681 static struct mbuf *
 682 rt_msg1(int type, struct rt_addrinfo *rtinfo)
 683 {
 684         struct rt_msghdr *rtm;
 685         struct mbuf *m;
 686         int i;
 687         struct sockaddr *sa;
 688         int len, dlen;
 689
 690         switch (type) {
 691
 692         case RTM_DELADDR:
 693         case RTM_NEWADDR:
 694                 len = sizeof(struct ifa_msghdr);
 695                 break;
 696
 697         case RTM_DELMADDR:
 698         case RTM_NEWMADDR:
 699                 len = sizeof(struct ifma_msghdr);
 700                 break;
 701
 702         case RTM_IFINFO:
 703                 len = sizeof(struct if_msghdr);
 704                 break;
 705
 706         case RTM_IFANNOUNCE:
 707         case RTM_IEEE80211:
 708                 len = sizeof(struct if_announcemsghdr);
 709                 break;
 710
 711         default:
 712                 len = sizeof(struct rt_msghdr);
 713         }
 714         if (len > MCLBYTES)
 715                 panic("rt_msg1");
 716         m = m_gethdr(M_DONTWAIT, MT_DATA);
 717         if (m && len > MHLEN) {
 718                 MCLGET(m, M_DONTWAIT);
 719                 if ((m->m_flags & M_EXT) == 0) {
 720                         m_free(m);
 721                         m = NULL;
 722                 }
 723         }
 724         if (m == NULL)
 725                 return (m);
 726         m->m_pkthdr.len = m->m_len = len;
 727         m->m_pkthdr.rcvif = NULL;
 728         rtm = mtod(m, struct rt_msghdr *);
 729         bzero((caddr_t)rtm, len);
 730         for (i = 0; i < RTAX_MAX; i++) {
 731                 if ((sa = rtinfo->rti_info[i]) == NULL)
 732                         continue;
 733                 rtinfo->rti_addrs |= (1 << i);
 734                 dlen = SA_SIZE(sa);
 735                 m_copyback(m, len, dlen, (caddr_t)sa);
 736                 len += dlen;
 737         }
 738         if (m->m_pkthdr.len != len) {
 739                 m_freem(m);
 740                 return (NULL);
 741         }
 742         rtm->rtm_msglen = len;
 743         rtm->rtm_version = RTM_VERSION;
 744         rtm->rtm_type = type;
 745         return (m);
 746 }
 747
 748 static int
 749 rt_msg2(int type, struct rt_addrinfo *rtinfo, caddr_t cp, struct walkarg *w)
 750 {
 751         int i;
 752         int len, dlen, second_time = 0;
 753         caddr_t cp0;
 754
 755         rtinfo->rti_addrs = 0;
 756 again:
 757         switch (type) {
 758
 759         case RTM_DELADDR:
 760         case RTM_NEWADDR:
 761                 len = sizeof(struct ifa_msghdr);
 762                 break;
 763
 764         case RTM_IFINFO:
 765                 len = sizeof(struct if_msghdr);
 766                 break;
 767
 768         case RTM_NEWMADDR:
 769                 len = sizeof(struct ifma_msghdr);
 770                 break;
 771
 772         default:
 773                 len = sizeof(struct rt_msghdr);
 774         }
 775         cp0 = cp;
 776         if (cp0)
 777                 cp += len;
 778         for (i = 0; i < RTAX_MAX; i++) {
 779                 struct sockaddr *sa;
 780
 781                 if ((sa = rtinfo->rti_info[i]) == NULL)
 782                         continue;
 783                 rtinfo->rti_addrs |= (1 << i);
 784                 dlen = SA_SIZE(sa);
 785                 if (cp) {
 786                         bcopy((caddr_t)sa, cp, (unsigned)dlen);
 787                         cp += dlen;
 788                 }
 789                 len += dlen;
 790         }
 791         len = ALIGN(len);
 792         if (cp == NULL && w != NULL && !second_time) {
 793                 struct walkarg *rw = w;
 794
 795                 if (rw->w_req) {
 796                         if (rw->w_tmemsize < len) {
 797                                 if (rw->w_tmem)
 798                                         free(rw->w_tmem, M_RTABLE);
 799                                 rw->w_tmem = (caddr_t)
 800                                         malloc(len, M_RTABLE, M_NOWAIT);
 801                                 if (rw->w_tmem)
 802                                         rw->w_tmemsize = len;
 803                         }
 804                         if (rw->w_tmem) {
 805                                 cp = rw->w_tmem;
 806                                 second_time = 1;
 807                                 goto again;
 808                         }
 809                 }
 810         }
 811         if (cp) {
 812                 struct rt_msghdr *rtm = (struct rt_msghdr *)cp0;
 813
 814                 rtm->rtm_version = RTM_VERSION;
 815                 rtm->rtm_type = type;
 816                 rtm->rtm_msglen = len;
 817         }
 818         return (len);
 819 }
 820
 821 /*
 822  * This routine is called to generate a message from the routing
 823  * socket indicating that a redirect has occured, a routing lookup
 824  * has failed, or that a protocol has detected timeouts to a particular
 825  * destination.
 826  */
 827 void
 828 rt_missmsg(int type, struct rt_addrinfo *rtinfo, int flags, int error)
 829 {
 830         struct rt_msghdr *rtm;
 831         struct mbuf *m;
 832         struct sockaddr *sa = rtinfo->rti_info[RTAX_DST];
 833
 834         if (route_cb.any_count == 0)
 835                 return;
 836         m = rt_msg1(type, rtinfo);
 837         if (m == NULL)
 838                 return;
 839         rtm = mtod(m, struct rt_msghdr *);
 840         rtm->rtm_flags = RTF_DONE | flags;
 841         rtm->rtm_errno = error;
 842         rtm->rtm_addrs = rtinfo->rti_addrs;
 843         rt_dispatch(m, sa);
 844 }
 845
 846 /*
 847  * This routine is called to generate a message from the routing
 848  * socket indicating that the status of a network interface has changed.
 849  */
 850 void
 851 rt_ifmsg(struct ifnet *ifp)
 852 {
 853         struct if_msghdr *ifm;
 854         struct mbuf *m;
 855         struct rt_addrinfo info;
 856
 857         if (route_cb.any_count == 0)
 858                 return;
 859         bzero((caddr_t)&info, sizeof(info));
 860         m = rt_msg1(RTM_IFINFO, &info);
 861         if (m == NULL)
 862                 return;
 863         ifm = mtod(m, struct if_msghdr *);
 864         ifm->ifm_index = ifp->if_index;
 865         ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
 866         ifm->ifm_data = ifp->if_data;
 867         ifm->ifm_addrs = 0;
 868         rt_dispatch(m, NULL);
 869 }
 870
 871 /*
 872  * This is called to generate messages from the routing socket
 873  * indicating a network interface has had addresses associated with it.
 874  * if we ever reverse the logic and replace messages TO the routing
 875  * socket indicate a request to configure interfaces, then it will
 876  * be unnecessary as the routing socket will automatically generate
 877  * copies of it.
 878  */
 879 void
 880 rt_newaddrmsg(int cmd, struct ifaddr *ifa, int error, struct rtentry *rt)
 881 {
 882         struct rt_addrinfo info;
 883         struct sockaddr *sa = NULL;
 884         int pass;
 885         struct mbuf *m = NULL;
 886         struct ifnet *ifp = ifa->ifa_ifp;
 887
 888         KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE,
 889                 ("unexpected cmd %u", cmd));
 890 #ifdef SCTP
 891         /*
 892          * notify the SCTP stack
 893          * this will only get called when an address is added/deleted
 894          * XXX pass the ifaddr struct instead if ifa->ifa_addr...
 895          */
 896         sctp_addr_change(ifa, cmd);
 897 #endif /* SCTP */
 898         if (route_cb.any_count == 0)
 899                 return;
 900         for (pass = 1; pass < 3; pass++) {
 901                 bzero((caddr_t)&info, sizeof(info));
 902                 if ((cmd == RTM_ADD && pass == 1) ||
 903                     (cmd == RTM_DELETE && pass == 2)) {
 904                         struct ifa_msghdr *ifam;
 905                         int ncmd = cmd == RTM_ADD ? RTM_NEWADDR : RTM_DELADDR;
 906
 907                         info.rti_info[RTAX_IFA] = sa = ifa->ifa_addr;
 908                         info.rti_info[RTAX_IFP] = ifp->if_addr->ifa_addr;
 909                         info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask;
 910                         info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr;
 911                         if ((m = rt_msg1(ncmd, &info)) == NULL)
 912                                 continue;
 913                         ifam = mtod(m, struct ifa_msghdr *);
 914                         ifam->ifam_index = ifp->if_index;
 915                         ifam->ifam_metric = ifa->ifa_metric;
 916                         ifam->ifam_flags = ifa->ifa_flags;
 917                         ifam->ifam_addrs = info.rti_addrs;
 918                 }
 919                 if ((cmd == RTM_ADD && pass == 2) ||
 920                     (cmd == RTM_DELETE && pass == 1)) {
 921                         struct rt_msghdr *rtm;
 922
 923                         if (rt == NULL)
 924                                 continue;
 925                         info.rti_info[RTAX_NETMASK] = rt_mask(rt);
 926                         info.rti_info[RTAX_DST] = sa = rt_key(rt);
 927                         info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
 928                         if ((m = rt_msg1(cmd, &info)) == NULL)
 929                                 continue;
 930                         rtm = mtod(m, struct rt_msghdr *);
 931                         rtm->rtm_index = ifp->if_index;
 932                         rtm->rtm_flags |= rt->rt_flags;
 933                         rtm->rtm_errno = error;
 934                         rtm->rtm_addrs = info.rti_addrs;
 935                 }
 936                 rt_dispatch(m, sa);
 937         }
 938 }
 939
 940 /*
 941  * This is the analogue to the rt_newaddrmsg which performs the same
 942  * function but for multicast group memberhips.  This is easier since
 943  * there is no route state to worry about.
 944  */
 945 void
 946 rt_newmaddrmsg(int cmd, struct ifmultiaddr *ifma)
 947 {
 948         struct rt_addrinfo info;
 949         struct mbuf *m = NULL;
 950         struct ifnet *ifp = ifma->ifma_ifp;
 951         struct ifma_msghdr *ifmam;
 952
 953         if (route_cb.any_count == 0)
 954                 return;
 955
 956         bzero((caddr_t)&info, sizeof(info));
 957         info.rti_info[RTAX_IFA] = ifma->ifma_addr;
 958         info.rti_info[RTAX_IFP] = ifp ? ifp->if_addr->ifa_addr : NULL;
 959         /*
 960          * If a link-layer address is present, present it as a ``gateway''
 961          * (similarly to how ARP entries, e.g., are presented).
 962          */
 963         info.rti_info[RTAX_GATEWAY] = ifma->ifma_lladdr;
 964         m = rt_msg1(cmd, &info);
 965         if (m == NULL)
 966                 return;
 967         ifmam = mtod(m, struct ifma_msghdr *);
 968         ifmam->ifmam_index = ifp->if_index;
 969         ifmam->ifmam_addrs = info.rti_addrs;
 970         rt_dispatch(m, ifma->ifma_addr);
 971 }
 972
 973 static struct mbuf *
 974 rt_makeifannouncemsg(struct ifnet *ifp, int type, int what,
 975         struct rt_addrinfo *info)
 976 {
 977         struct if_announcemsghdr *ifan;
 978         struct mbuf *m;
 979
 980         if (route_cb.any_count == 0)
 981                 return NULL;
 982         bzero((caddr_t)info, sizeof(*info));
 983         m = rt_msg1(type, info);
 984         if (m != NULL) {
 985                 ifan = mtod(m, struct if_announcemsghdr *);
 986                 ifan->ifan_index = ifp->if_index;
 987                 strlcpy(ifan->ifan_name, ifp->if_xname,
 988                         sizeof(ifan->ifan_name));
 989                 ifan->ifan_what = what;
 990         }
 991         return m;
 992 }
 993
 994 /*
 995  * This is called to generate routing socket messages indicating
 996  * IEEE80211 wireless events.
 997  * XXX we piggyback on the RTM_IFANNOUNCE msg format in a clumsy way.
 998  */
 999 void
1000 rt_ieee80211msg(struct ifnet *ifp, int what, void *data, size_t data_len)
1001 {
1002         struct mbuf *m;
1003         struct rt_addrinfo info;
1004
1005         m = rt_makeifannouncemsg(ifp, RTM_IEEE80211, what, &info);
1006         if (m != NULL) {
1007                 /*
1008                  * Append the ieee80211 data.  Try to stick it in the
1009                  * mbuf containing the ifannounce msg; otherwise allocate
1010                  * a new mbuf and append.
1011                  *
1012                  * NB: we assume m is a single mbuf.
1013                  */
1014                 if (data_len > M_TRAILINGSPACE(m)) {
1015                         struct mbuf *n = m_get(M_NOWAIT, MT_DATA);
1016                         if (n == NULL) {
1017                                 m_freem(m);
1018                                 return;
1019                         }
1020                         bcopy(data, mtod(n, void *), data_len);
1021                         n->m_len = data_len;
1022                         m->m_next = n;
1023                 } else if (data_len > 0) {
1024                         bcopy(data, mtod(m, u_int8_t *) + m->m_len, data_len);
1025                         m->m_len += data_len;
1026                 }
1027                 if (m->m_flags & M_PKTHDR)
1028                         m->m_pkthdr.len += data_len;
1029                 mtod(m, struct if_announcemsghdr *)->ifan_msglen += data_len;
1030                 rt_dispatch(m, NULL);
1031         }
1032 }
1033
1034 /*
1035  * This is called to generate routing socket messages indicating
1036  * network interface arrival and departure.
1037  */
1038 void
1039 rt_ifannouncemsg(struct ifnet *ifp, int what)
1040 {
1041         struct mbuf *m;
1042         struct rt_addrinfo info;
1043
1044         m = rt_makeifannouncemsg(ifp, RTM_IFANNOUNCE, what, &info);
1045         if (m != NULL)
1046                 rt_dispatch(m, NULL);
1047 }
1048
1049 static void
1050 rt_dispatch(struct mbuf *m, const struct sockaddr *sa)
1051 {
1052         struct m_tag *tag;
1053
1054         /*
1055          * Preserve the family from the sockaddr, if any, in an m_tag for
1056          * use when injecting the mbuf into the routing socket buffer from
1057          * the netisr.
1058          */
1059         if (sa != NULL) {
1060                 tag = m_tag_get(PACKET_TAG_RTSOCKFAM, sizeof(unsigned short),
1061                     M_NOWAIT);
1062                 if (tag == NULL) {
1063                         m_freem(m);
1064                         return;
1065                 }
1066                 *(unsigned short *)(tag + 1) = sa->sa_family;
1067                 m_tag_prepend(m, tag);
1068         }
1069         netisr_queue(NETISR_ROUTE, m);  /* mbuf is free'd on failure. */
1070 }
1071
1072 /*
1073  * This is used in dumping the kernel table via sysctl().
1074  */
1075 static int
1076 sysctl_dumpentry(struct radix_node *rn, void *vw)
1077 {
1078         struct walkarg *w = vw;
1079         struct rtentry *rt = (struct rtentry *)rn;
1080         int error = 0, size;
1081         struct rt_addrinfo info;
1082
1083         if (w->w_op == NET_RT_FLAGS && !(rt->rt_flags & w->w_arg))
1084                 return 0;
1085         bzero((caddr_t)&info, sizeof(info));
1086         info.rti_info[RTAX_DST] = rt_key(rt);
1087         info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
1088         info.rti_info[RTAX_NETMASK] = rt_mask(rt);
1089         info.rti_info[RTAX_GENMASK] = rt->rt_genmask;
1090         if (rt->rt_ifp) {
1091                 info.rti_info[RTAX_IFP] = rt->rt_ifp->if_addr->ifa_addr;
1092                 info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
1093                 if (rt->rt_ifp->if_flags & IFF_POINTOPOINT)
1094                         info.rti_info[RTAX_BRD] = rt->rt_ifa->ifa_dstaddr;
1095         }
1096         size = rt_msg2(RTM_GET, &info, NULL, w);
1097         if (w->w_req && w->w_tmem) {
1098                 struct rt_msghdr *rtm = (struct rt_msghdr *)w->w_tmem;
1099
1100                 rtm->rtm_flags = rt->rt_flags;
1101                 rtm->rtm_use = rt->rt_rmx.rmx_pksent;
1102                 rt_getmetrics(&rt->rt_rmx, &rtm->rtm_rmx);
1103                 rtm->rtm_index = rt->rt_ifp->if_index;
1104                 rtm->rtm_errno = rtm->rtm_pid = rtm->rtm_seq = 0;
1105                 rtm->rtm_addrs = info.rti_addrs;
1106                 error = SYSCTL_OUT(w->w_req, (caddr_t)rtm, size);
1107                 return (error);
1108         }
1109         return (error);
1110 }
1111
1112 static int
1113 sysctl_iflist(int af, struct walkarg *w)
1114 {
1115         struct ifnet *ifp;
1116         struct ifaddr *ifa;
1117         struct rt_addrinfo info;
1118         int len, error = 0;
1119
1120         bzero((caddr_t)&info, sizeof(info));
1121         IFNET_RLOCK();
1122         TAILQ_FOREACH(ifp, &ifnet, if_link) {
1123                 if (w->w_arg && w->w_arg != ifp->if_index)
1124                         continue;
1125                 ifa = ifp->if_addr;
1126                 info.rti_info[RTAX_IFP] = ifa->ifa_addr;
1127                 len = rt_msg2(RTM_IFINFO, &info, NULL, w);
1128                 info.rti_info[RTAX_IFP] = NULL;
1129                 if (w->w_req && w->w_tmem) {
1130                         struct if_msghdr *ifm;
1131
1132                         ifm = (struct if_msghdr *)w->w_tmem;
1133                         ifm->ifm_index = ifp->if_index;
1134                         ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
1135                         ifm->ifm_data = ifp->if_data;
1136                         ifm->ifm_addrs = info.rti_addrs;
1137                         error = SYSCTL_OUT(w->w_req,(caddr_t)ifm, len);
1138                         if (error)
1139                                 goto done;
1140                 }
1141                 while ((ifa = TAILQ_NEXT(ifa, ifa_link)) != NULL) {
1142                         if (af && af != ifa->ifa_addr->sa_family)
1143                                 continue;
1144                         if (jailed(curthread->td_ucred) &&
1145                             prison_if(curthread->td_ucred, ifa->ifa_addr))
1146                                 continue;
1147                         info.rti_info[RTAX_IFA] = ifa->ifa_addr;
1148                         info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask;
1149                         info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr;
1150                         len = rt_msg2(RTM_NEWADDR, &info, NULL, w);
1151                         if (w->w_req && w->w_tmem) {
1152                                 struct ifa_msghdr *ifam;
1153
1154                                 ifam = (struct ifa_msghdr *)w->w_tmem;
1155                                 ifam->ifam_index = ifa->ifa_ifp->if_index;
1156                                 ifam->ifam_flags = ifa->ifa_flags;
1157                                 ifam->ifam_metric = ifa->ifa_metric;
1158                                 ifam->ifam_addrs = info.rti_addrs;
1159                                 error = SYSCTL_OUT(w->w_req, w->w_tmem, len);
1160                                 if (error)
1161                                         goto done;
1162                         }
1163                 }
1164                 info.rti_info[RTAX_IFA] = info.rti_info[RTAX_NETMASK] =
1165                         info.rti_info[RTAX_BRD] = NULL;
1166         }
1167 done:
1168         IFNET_RUNLOCK();
1169         return (error);
1170 }
1171
1172 int
1173 sysctl_ifmalist(int af, struct walkarg *w)
1174 {
1175         struct ifnet *ifp;
1176         struct ifmultiaddr *ifma;
1177         struct  rt_addrinfo info;
1178         int     len, error = 0;
1179         struct ifaddr *ifa;
1180
1181         bzero((caddr_t)&info, sizeof(info));
1182         IFNET_RLOCK();
1183         TAILQ_FOREACH(ifp, &ifnet, if_link) {
1184                 if (w->w_arg && w->w_arg != ifp->if_index)
1185                         continue;
1186                 ifa = ifp->if_addr;
1187                 info.rti_info[RTAX_IFP] = ifa ? ifa->ifa_addr : NULL;
1188                 IF_ADDR_LOCK(ifp);
1189                 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1190                         if (af && af != ifma->ifma_addr->sa_family)
1191                                 continue;
1192                         if (jailed(curproc->p_ucred) &&
1193                             prison_if(curproc->p_ucred, ifma->ifma_addr))
1194                                 continue;
1195                         info.rti_info[RTAX_IFA] = ifma->ifma_addr;
1196                         info.rti_info[RTAX_GATEWAY] =
1197                             (ifma->ifma_addr->sa_family != AF_LINK) ?
1198                             ifma->ifma_lladdr : NULL;
1199                         len = rt_msg2(RTM_NEWMADDR, &info, NULL, w);
1200                         if (w->w_req && w->w_tmem) {
1201                                 struct ifma_msghdr *ifmam;
1202
1203                                 ifmam = (struct ifma_msghdr *)w->w_tmem;
1204                                 ifmam->ifmam_index = ifma->ifma_ifp->if_index;
1205                                 ifmam->ifmam_flags = 0;
1206                                 ifmam->ifmam_addrs = info.rti_addrs;
1207                                 error = SYSCTL_OUT(w->w_req, w->w_tmem, len);
1208                                 if (error) {
1209                                         IF_ADDR_UNLOCK(ifp);
1210                                         goto done;
1211                                 }
1212                         }
1213                 }
1214                 IF_ADDR_UNLOCK(ifp);
1215         }
1216 done:
1217         IFNET_RUNLOCK();
1218         return (error);
1219 }
1220
1221 static int
1222 sysctl_rtsock(SYSCTL_HANDLER_ARGS)
1223 {
1224         int     *name = (int *)arg1;
1225         u_int   namelen = arg2;
1226         struct radix_node_head *rnh;
1227         int     i, lim, error = EINVAL;
1228         u_char  af;
1229         struct  walkarg w;
1230
1231         name ++;
1232         namelen--;
1233         if (req->newptr)
1234                 return (EPERM);
1235         if (namelen != 3)
1236                 return ((namelen < 3) ? EISDIR : ENOTDIR);
1237         af = name[0];
1238         if (af > AF_MAX)
1239                 return (EINVAL);
1240         bzero(&w, sizeof(w));
1241         w.w_op = name[1];
1242         w.w_arg = name[2];
1243         w.w_req = req;
1244
1245         error = sysctl_wire_old_buffer(req, 0);
1246         if (error)
1247                 return (error);
1248         switch (w.w_op) {
1249
1250         case NET_RT_DUMP:
1251         case NET_RT_FLAGS:
1252                 if (af == 0) {                  /* dump all tables */
1253                         i = 1;
1254                         lim = AF_MAX;
1255                 } else                          /* dump only one table */
1256                         i = lim = af;
1257                 for (error = 0; error == 0 && i <= lim; i++)
1258                         if ((rnh = rt_tables[i]) != NULL) {
1259                                 RADIX_NODE_HEAD_LOCK(rnh);
1260                                 error = rnh->rnh_walktree(rnh,
1261                                     sysctl_dumpentry, &w);
1262                                 RADIX_NODE_HEAD_UNLOCK(rnh);
1263                         } else if (af != 0)
1264                                 error = EAFNOSUPPORT;
1265                 break;
1266
1267         case NET_RT_IFLIST:
1268                 error = sysctl_iflist(af, &w);
1269                 break;
1270
1271         case NET_RT_IFMALIST:
1272                 error = sysctl_ifmalist(af, &w);
1273                 break;
1274         }
1275         if (w.w_tmem)
1276                 free(w.w_tmem, M_RTABLE);
1277         return (error);
1278 }
1279
1280 SYSCTL_NODE(_net, PF_ROUTE, routetable, CTLFLAG_RD, sysctl_rtsock, "");
1281
1282 /*
1283  * Definitions of protocols supported in the ROUTE domain.
1284  */
1285
1286 static struct domain routedomain;               /* or at least forward */
1287
1288 static struct protosw routesw[] = {
1289 {
1290         .pr_type =              SOCK_RAW,
1291         .pr_domain =            &routedomain,
1292         .pr_flags =             PR_ATOMIC|PR_ADDR,
1293         .pr_output =            route_output,
1294         .pr_ctlinput =          raw_ctlinput,
1295         .pr_init =              raw_init,
1296         .pr_usrreqs =           &route_usrreqs
1297 }
1298 };
1299
1300 static struct domain routedomain = {
1301         .dom_family =           PF_ROUTE,
1302         .dom_name =              "route",
1303         .dom_protosw =          routesw,
1304         .dom_protoswNPROTOSW =  &routesw[sizeof(routesw)/sizeof(routesw[0])]
1305 };
1306
1307 DOMAIN_SET(route);