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