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