sys/net/rtsock.c

   1 /*
   2  * Copyright (c) 2004, 2005 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Jeffrey M. Hsu.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of The DragonFly Project nor the names of its
  16  *    contributors may be used to endorse or promote products derived
  17  *    from this software without specific, prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  22  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  23  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  24  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  25  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  26  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  27  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  28  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  29  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 /*
  34  * Copyright (c) 1988, 1991, 1993
  35  *      The Regents of the University of California.  All rights reserved.
  36  *
  37  * Redistribution and use in source and binary forms, with or without
  38  * modification, are permitted provided that the following conditions
  39  * are met:
  40  * 1. Redistributions of source code must retain the above copyright
  41  *    notice, this list of conditions and the following disclaimer.
  42  * 2. Redistributions in binary form must reproduce the above copyright
  43  *    notice, this list of conditions and the following disclaimer in the
  44  *    documentation and/or other materials provided with the distribution.
  45  * 3. All advertising materials mentioning features or use of this software
  46  *    must display the following acknowledgement:
  47  *      This product includes software developed by the University of
  48  *      California, Berkeley and its contributors.
  49  * 4. Neither the name of the University nor the names of its contributors
  50  *    may be used to endorse or promote products derived from this software
  51  *    without specific prior written permission.
  52  *
  53  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  54  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  55  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  56  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  57  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  58  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  59  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  60  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  61  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  62  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  63  * SUCH DAMAGE.
  64  *
  65  *      @(#)rtsock.c    8.7 (Berkeley) 10/12/95
  66  * $FreeBSD: src/sys/net/rtsock.c,v 1.44.2.11 2002/12/04 14:05:41 ru Exp $
  67  * $DragonFly: src/sys/net/rtsock.c,v 1.45 2008/10/27 02:56:30 sephe Exp $
  68  */
  69
  70 #include "opt_sctp.h"
  71
  72 #include <sys/param.h>
  73 #include <sys/systm.h>
  74 #include <sys/kernel.h>
  75 #include <sys/sysctl.h>
  76 #include <sys/proc.h>
  77 #include <sys/priv.h>
  78 #include <sys/malloc.h>
  79 #include <sys/mbuf.h>
  80 #include <sys/protosw.h>
  81 #include <sys/socket.h>
  82 #include <sys/socketvar.h>
  83 #include <sys/domain.h>
  84 #include <sys/thread2.h>
  85
  86 #include <net/if.h>
  87 #include <net/route.h>
  88 #include <net/raw_cb.h>
  89 #include <net/netmsg2.h>
  90
  91 #ifdef SCTP
  92 extern void sctp_add_ip_address(struct ifaddr *ifa);
  93 extern void sctp_delete_ip_address(struct ifaddr *ifa);
  94 #endif /* SCTP */
  95
  96 MALLOC_DEFINE(M_RTABLE, "routetbl", "routing tables");
  97
  98 static struct route_cb {
  99         int     ip_count;
 100         int     ip6_count;
 101         int     ipx_count;
 102         int     ns_count;
 103         int     any_count;
 104 } route_cb;
 105
 106 static const struct sockaddr route_src = { 2, PF_ROUTE, };
 107
 108 struct walkarg {
 109         int     w_tmemsize;
 110         int     w_op, w_arg;
 111         void    *w_tmem;
 112         struct sysctl_req *w_req;
 113 };
 114
 115 static struct mbuf *
 116                 rt_msg_mbuf (int, struct rt_addrinfo *);
 117 static void     rt_msg_buffer (int, struct rt_addrinfo *, void *buf, int len);
 118 static int      rt_msgsize (int type, struct rt_addrinfo *rtinfo);
 119 static int      rt_xaddrs (char *, char *, struct rt_addrinfo *);
 120 static int      sysctl_dumpentry (struct radix_node *rn, void *vw);
 121 static int      sysctl_iflist (int af, struct walkarg *w);
 122 static int      route_output(struct mbuf *, struct socket *, ...);
 123 static void     rt_setmetrics (u_long, struct rt_metrics *,
 124                                struct rt_metrics *);
 125
 126 /*
 127  * It really doesn't make any sense at all for this code to share much
 128  * with raw_usrreq.c, since its functionality is so restricted.  XXX
 129  */
 130 static int
 131 rts_abort(struct socket *so)
 132 {
 133         int error;
 134
 135         crit_enter();
 136         error = raw_usrreqs.pru_abort(so);
 137         crit_exit();
 138         return error;
 139 }
 140
 141 /* pru_accept is EOPNOTSUPP */
 142
 143 static int
 144 rts_attach(struct socket *so, int proto, struct pru_attach_info *ai)
 145 {
 146         struct rawcb *rp;
 147         int error;
 148
 149         if (sotorawcb(so) != NULL)
 150                 return EISCONN; /* XXX panic? */
 151
 152         rp = kmalloc(sizeof *rp, M_PCB, M_WAITOK | M_ZERO);
 153
 154         /*
 155          * The critical section is necessary to block protocols from sending
 156          * error notifications (like RTM_REDIRECT or RTM_LOSING) while
 157          * this PCB is extant but incompletely initialized.
 158          * Probably we should try to do more of this work beforehand and
 159          * eliminate the critical section.
 160          */
 161         crit_enter();
 162         so->so_pcb = rp;
 163         error = raw_attach(so, proto, ai->sb_rlimit);
 164         rp = sotorawcb(so);
 165         if (error) {
 166                 crit_exit();
 167                 kfree(rp, M_PCB);
 168                 return error;
 169         }
 170         switch(rp->rcb_proto.sp_protocol) {
 171         case AF_INET:
 172                 route_cb.ip_count++;
 173                 break;
 174         case AF_INET6:
 175                 route_cb.ip6_count++;
 176                 break;
 177         case AF_IPX:
 178                 route_cb.ipx_count++;
 179                 break;
 180         case AF_NS:
 181                 route_cb.ns_count++;
 182                 break;
 183         }
 184         rp->rcb_faddr = &route_src;
 185         route_cb.any_count++;
 186         soisconnected(so);
 187         so->so_options |= SO_USELOOPBACK;
 188         crit_exit();
 189         return 0;
 190 }
 191
 192 static int
 193 rts_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
 194 {
 195         int error;
 196
 197         crit_enter();
 198         error = raw_usrreqs.pru_bind(so, nam, td); /* xxx just EINVAL */
 199         crit_exit();
 200         return error;
 201 }
 202
 203 static int
 204 rts_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
 205 {
 206         int error;
 207
 208         crit_enter();
 209         error = raw_usrreqs.pru_connect(so, nam, td); /* XXX just EINVAL */
 210         crit_exit();
 211         return error;
 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 error;
 222
 223         crit_enter();
 224         if (rp != NULL) {
 225                 switch(rp->rcb_proto.sp_protocol) {
 226                 case AF_INET:
 227                         route_cb.ip_count--;
 228                         break;
 229                 case AF_INET6:
 230                         route_cb.ip6_count--;
 231                         break;
 232                 case AF_IPX:
 233                         route_cb.ipx_count--;
 234                         break;
 235                 case AF_NS:
 236                         route_cb.ns_count--;
 237                         break;
 238                 }
 239                 route_cb.any_count--;
 240         }
 241         error = raw_usrreqs.pru_detach(so);
 242         crit_exit();
 243         return error;
 244 }
 245
 246 static int
 247 rts_disconnect(struct socket *so)
 248 {
 249         int error;
 250
 251         crit_enter();
 252         error = raw_usrreqs.pru_disconnect(so);
 253         crit_exit();
 254         return error;
 255 }
 256
 257 /* pru_listen is EOPNOTSUPP */
 258
 259 static int
 260 rts_peeraddr(struct socket *so, struct sockaddr **nam)
 261 {
 262         int error;
 263
 264         crit_enter();
 265         error = raw_usrreqs.pru_peeraddr(so, nam);
 266         crit_exit();
 267         return error;
 268 }
 269
 270 /* pru_rcvd is EOPNOTSUPP */
 271 /* pru_rcvoob is EOPNOTSUPP */
 272
 273 static int
 274 rts_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
 275          struct mbuf *control, struct thread *td)
 276 {
 277         int error;
 278
 279         crit_enter();
 280         error = raw_usrreqs.pru_send(so, flags, m, nam, control, td);
 281         crit_exit();
 282         return error;
 283 }
 284
 285 /* pru_sense is null */
 286
 287 static int
 288 rts_shutdown(struct socket *so)
 289 {
 290         int error;
 291
 292         crit_enter();
 293         error = raw_usrreqs.pru_shutdown(so);
 294         crit_exit();
 295         return error;
 296 }
 297
 298 static int
 299 rts_sockaddr(struct socket *so, struct sockaddr **nam)
 300 {
 301         int error;
 302
 303         crit_enter();
 304         error = raw_usrreqs.pru_sockaddr(so, nam);
 305         crit_exit();
 306         return error;
 307 }
 308
 309 static struct pr_usrreqs route_usrreqs = {
 310         .pru_abort = rts_abort,
 311         .pru_accept = pru_accept_notsupp,
 312         .pru_attach = rts_attach,
 313         .pru_bind = rts_bind,
 314         .pru_connect = rts_connect,
 315         .pru_connect2 = pru_connect2_notsupp,
 316         .pru_control = pru_control_notsupp,
 317         .pru_detach = rts_detach,
 318         .pru_disconnect = rts_disconnect,
 319         .pru_listen = pru_listen_notsupp,
 320         .pru_peeraddr = rts_peeraddr,
 321         .pru_rcvd = pru_rcvd_notsupp,
 322         .pru_rcvoob = pru_rcvoob_notsupp,
 323         .pru_send = rts_send,
 324         .pru_sense = pru_sense_null,
 325         .pru_shutdown = rts_shutdown,
 326         .pru_sockaddr = rts_sockaddr,
 327         .pru_sosend = sosend,
 328         .pru_soreceive = soreceive,
 329         .pru_sopoll = sopoll
 330 };
 331
 332 static __inline sa_family_t
 333 familyof(struct sockaddr *sa)
 334 {
 335         return (sa != NULL ? sa->sa_family : 0);
 336 }
 337
 338 /*
 339  * Routing socket input function.  The packet must be serialized onto cpu 0.
 340  * We use the cpu0_soport() netisr processing loop to handle it.
 341  *
 342  * This looks messy but it means that anyone, including interrupt code,
 343  * can send a message to the routing socket.
 344  */
 345 static void
 346 rts_input_handler(struct netmsg *msg)
 347 {
 348         static const struct sockaddr route_dst = { 2, PF_ROUTE, };
 349         struct sockproto route_proto;
 350         struct netmsg_packet *pmsg;
 351         struct mbuf *m;
 352         sa_family_t family;
 353         struct rawcb *skip;
 354
 355         pmsg = (void *)msg;
 356         family = pmsg->nm_netmsg.nm_lmsg.u.ms_result;
 357         route_proto.sp_family = PF_ROUTE;
 358         route_proto.sp_protocol = family;
 359
 360         m = pmsg->nm_packet;
 361         M_ASSERTPKTHDR(m);
 362
 363         skip = m->m_pkthdr.header;
 364         m->m_pkthdr.header = NULL;
 365
 366         raw_input(m, &route_proto, &route_src, &route_dst, skip);
 367 }
 368
 369 static void
 370 rts_input_skip(struct mbuf *m, sa_family_t family, struct rawcb *skip)
 371 {
 372         struct netmsg_packet *pmsg;
 373         lwkt_port_t port;
 374
 375         M_ASSERTPKTHDR(m);
 376
 377         port = cpu0_soport(NULL, NULL, NULL, 0);
 378         pmsg = &m->m_hdr.mh_netmsg;
 379         netmsg_init(&pmsg->nm_netmsg, &netisr_apanic_rport,
 380                     0, rts_input_handler);
 381         pmsg->nm_packet = m;
 382         pmsg->nm_netmsg.nm_lmsg.u.ms_result = family;
 383         m->m_pkthdr.header = skip; /* XXX steal field in pkthdr */
 384         lwkt_sendmsg(port, &pmsg->nm_netmsg.nm_lmsg);
 385 }
 386
 387 static __inline void
 388 rts_input(struct mbuf *m, sa_family_t family)
 389 {
 390         rts_input_skip(m, family, NULL);
 391 }
 392
 393 static void *
 394 reallocbuf(void *ptr, size_t len, size_t olen)
 395 {
 396         void *newptr;
 397
 398         newptr = kmalloc(len, M_RTABLE, M_INTWAIT | M_NULLOK);
 399         if (newptr == NULL)
 400                 return NULL;
 401         bcopy(ptr, newptr, olen);
 402         kfree(ptr, M_RTABLE);
 403         return (newptr);
 404 }
 405
 406 /*
 407  * Internal helper routine for route_output().
 408  */
 409 static int
 410 fillrtmsg(struct rt_msghdr **prtm, struct rtentry *rt,
 411           struct rt_addrinfo *rtinfo)
 412 {
 413         int msglen;
 414         struct rt_msghdr *rtm = *prtm;
 415
 416         /* Fill in rt_addrinfo for call to rt_msg_buffer(). */
 417         rtinfo->rti_dst = rt_key(rt);
 418         rtinfo->rti_gateway = rt->rt_gateway;
 419         rtinfo->rti_netmask = rt_mask(rt);              /* might be NULL */
 420         rtinfo->rti_genmask = rt->rt_genmask;           /* might be NULL */
 421         if (rtm->rtm_addrs & (RTA_IFP | RTA_IFA)) {
 422                 if (rt->rt_ifp != NULL) {
 423                         rtinfo->rti_ifpaddr =
 424                             TAILQ_FIRST(&rt->rt_ifp->if_addrheads[mycpuid])
 425                             ->ifa->ifa_addr;
 426                         rtinfo->rti_ifaaddr = rt->rt_ifa->ifa_addr;
 427                         if (rt->rt_ifp->if_flags & IFF_POINTOPOINT)
 428                                 rtinfo->rti_bcastaddr = rt->rt_ifa->ifa_dstaddr;
 429                         rtm->rtm_index = rt->rt_ifp->if_index;
 430                 } else {
 431                         rtinfo->rti_ifpaddr = NULL;
 432                         rtinfo->rti_ifaaddr = NULL;
 433                 }
 434         } else if (rt->rt_ifp != NULL) {
 435                 rtm->rtm_index = rt->rt_ifp->if_index;
 436         }
 437
 438         msglen = rt_msgsize(rtm->rtm_type, rtinfo);
 439         if (rtm->rtm_msglen < msglen) {
 440                 rtm = reallocbuf(rtm, msglen, rtm->rtm_msglen);
 441                 if (rtm == NULL)
 442                         return (ENOBUFS);
 443                 *prtm = rtm;
 444         }
 445         rt_msg_buffer(rtm->rtm_type, rtinfo, rtm, msglen);
 446
 447         rtm->rtm_flags = rt->rt_flags;
 448         rtm->rtm_rmx = rt->rt_rmx;
 449         rtm->rtm_addrs = rtinfo->rti_addrs;
 450
 451         return (0);
 452 }
 453
 454 static void route_output_add_callback(int, int, struct rt_addrinfo *,
 455                                         struct rtentry *, void *);
 456 static void route_output_delete_callback(int, int, struct rt_addrinfo *,
 457                                         struct rtentry *, void *);
 458 static int route_output_get_callback(int, struct rt_addrinfo *,
 459                                      struct rtentry *, void *, int);
 460 static int route_output_change_callback(int, struct rt_addrinfo *,
 461                                         struct rtentry *, void *, int);
 462 static int route_output_lock_callback(int, struct rt_addrinfo *,
 463                                       struct rtentry *, void *, int);
 464
 465 /*ARGSUSED*/
 466 static int
 467 route_output(struct mbuf *m, struct socket *so, ...)
 468 {
 469         struct rt_msghdr *rtm = NULL;
 470         struct rawcb *rp = NULL;
 471         struct pr_output_info *oi;
 472         struct rt_addrinfo rtinfo;
 473         int len, error = 0;
 474         __va_list ap;
 475
 476         M_ASSERTPKTHDR(m);
 477
 478         __va_start(ap, so);
 479         oi = __va_arg(ap, struct pr_output_info *);
 480         __va_end(ap);
 481
 482 #define gotoerr(e) { error = e; goto flush;}
 483
 484         if (m == NULL ||
 485             (m->m_len < sizeof(long) &&
 486              (m = m_pullup(m, sizeof(long))) == NULL))
 487                 return (ENOBUFS);
 488         len = m->m_pkthdr.len;
 489         if (len < sizeof(struct rt_msghdr) ||
 490             len != mtod(m, struct rt_msghdr *)->rtm_msglen) {
 491                 rtinfo.rti_dst = NULL;
 492                 gotoerr(EINVAL);
 493         }
 494         rtm = kmalloc(len, M_RTABLE, M_INTWAIT | M_NULLOK);
 495         if (rtm == NULL) {
 496                 rtinfo.rti_dst = NULL;
 497                 gotoerr(ENOBUFS);
 498         }
 499         m_copydata(m, 0, len, (caddr_t)rtm);
 500         if (rtm->rtm_version != RTM_VERSION) {
 501                 rtinfo.rti_dst = NULL;
 502                 gotoerr(EPROTONOSUPPORT);
 503         }
 504         rtm->rtm_pid = oi->p_pid;
 505         bzero(&rtinfo, sizeof(struct rt_addrinfo));
 506         rtinfo.rti_addrs = rtm->rtm_addrs;
 507         if (rt_xaddrs((char *)(rtm + 1), (char *)rtm + len, &rtinfo) != 0) {
 508                 rtinfo.rti_dst = NULL;
 509                 gotoerr(EINVAL);
 510         }
 511         rtinfo.rti_flags = rtm->rtm_flags;
 512         if (rtinfo.rti_dst == NULL || rtinfo.rti_dst->sa_family >= AF_MAX ||
 513             (rtinfo.rti_gateway && rtinfo.rti_gateway->sa_family >= AF_MAX))
 514                 gotoerr(EINVAL);
 515
 516         if (rtinfo.rti_genmask != NULL) {
 517                 error = rtmask_add_global(rtinfo.rti_genmask);
 518                 if (error)
 519                         goto flush;
 520         }
 521
 522         /*
 523          * Verify that the caller has the appropriate privilege; RTM_GET
 524          * is the only operation the non-superuser is allowed.
 525          */
 526         if (rtm->rtm_type != RTM_GET &&
 527             priv_check_cred(so->so_cred, PRIV_ROOT, 0) != 0)
 528                 gotoerr(EPERM);
 529
 530         switch (rtm->rtm_type) {
 531         case RTM_ADD:
 532                 if (rtinfo.rti_gateway == NULL) {
 533                         error = EINVAL;
 534                 } else {
 535                         error = rtrequest1_global(RTM_ADD, &rtinfo,
 536                                           route_output_add_callback, rtm);
 537                 }
 538                 break;
 539         case RTM_DELETE:
 540                 /*
 541                  * note: &rtm passed as argument so 'rtm' can be replaced.
 542                  */
 543                 error = rtrequest1_global(RTM_DELETE, &rtinfo,
 544                                           route_output_delete_callback, &rtm);
 545                 break;
 546         case RTM_GET:
 547                 /*
 548                  * note: &rtm passed as argument so 'rtm' can be replaced.
 549                  */
 550                 error = rtsearch_global(RTM_GET, &rtinfo,
 551                                         route_output_get_callback, &rtm,
 552                                         RTS_NOEXACTMATCH);
 553                 break;
 554         case RTM_CHANGE:
 555                 error = rtsearch_global(RTM_CHANGE, &rtinfo,
 556                                         route_output_change_callback, rtm,
 557                                         RTS_EXACTMATCH);
 558                 break;
 559         case RTM_LOCK:
 560                 error = rtsearch_global(RTM_LOCK, &rtinfo,
 561                                         route_output_lock_callback, rtm,
 562                                         RTS_EXACTMATCH);
 563                 break;
 564         default:
 565                 error = EOPNOTSUPP;
 566                 break;
 567         }
 568
 569 flush:
 570         if (rtm != NULL) {
 571                 if (error != 0)
 572                         rtm->rtm_errno = error;
 573                 else
 574                         rtm->rtm_flags |= RTF_DONE;
 575         }
 576
 577         /*
 578          * Check to see if we don't want our own messages.
 579          */
 580         if (!(so->so_options & SO_USELOOPBACK)) {
 581                 if (route_cb.any_count <= 1) {
 582                         if (rtm != NULL)
 583                                 kfree(rtm, M_RTABLE);
 584                         m_freem(m);
 585                         return (error);
 586                 }
 587                 /* There is another listener, so construct message */
 588                 rp = sotorawcb(so);
 589         }
 590         if (rtm != NULL) {
 591                 m_copyback(m, 0, rtm->rtm_msglen, (caddr_t)rtm);
 592                 if (m->m_pkthdr.len < rtm->rtm_msglen) {
 593                         m_freem(m);
 594                         m = NULL;
 595                 } else if (m->m_pkthdr.len > rtm->rtm_msglen)
 596                         m_adj(m, rtm->rtm_msglen - m->m_pkthdr.len);
 597                 kfree(rtm, M_RTABLE);
 598         }
 599         if (m != NULL)
 600                 rts_input_skip(m, familyof(rtinfo.rti_dst), rp);
 601         return (error);
 602 }
 603
 604 static void
 605 route_output_add_callback(int cmd, int error, struct rt_addrinfo *rtinfo,
 606                           struct rtentry *rt, void *arg)
 607 {
 608         struct rt_msghdr *rtm = arg;
 609
 610         if (error == 0 && rt != NULL) {
 611                 rt_setmetrics(rtm->rtm_inits, &rtm->rtm_rmx,
 612                     &rt->rt_rmx);
 613                 rt->rt_rmx.rmx_locks &= ~(rtm->rtm_inits);
 614                 rt->rt_rmx.rmx_locks |=
 615                     (rtm->rtm_inits & rtm->rtm_rmx.rmx_locks);
 616                 if (rtinfo->rti_genmask != NULL) {
 617                         rt->rt_genmask = rtmask_purelookup(rtinfo->rti_genmask);
 618                         if (rt->rt_genmask == NULL) {
 619                                 /*
 620                                  * This should not happen, since we
 621                                  * have already installed genmask
 622                                  * on each CPU before we reach here.
 623                                  */
 624                                 panic("genmask is gone!?");
 625                         }
 626                 } else {
 627                         rt->rt_genmask = NULL;
 628                 }
 629                 rtm->rtm_index = rt->rt_ifp->if_index;
 630         }
 631 }
 632
 633 static void
 634 route_output_delete_callback(int cmd, int error, struct rt_addrinfo *rtinfo,
 635                           struct rtentry *rt, void *arg)
 636 {
 637         struct rt_msghdr **rtm = arg;
 638
 639         if (error == 0 && rt) {
 640                 ++rt->rt_refcnt;
 641                 if (fillrtmsg(rtm, rt, rtinfo) != 0) {
 642                         error = ENOBUFS;
 643                         /* XXX no way to return the error */
 644                 }
 645                 --rt->rt_refcnt;
 646         }
 647 }
 648
 649 static int
 650 route_output_get_callback(int cmd, struct rt_addrinfo *rtinfo,
 651                           struct rtentry *rt, void *arg, int found_cnt)
 652 {
 653         struct rt_msghdr **rtm = arg;
 654         int error, found = 0;
 655
 656         if (((rtinfo->rti_flags ^ rt->rt_flags) & RTF_HOST) == 0)
 657                 found = 1;
 658
 659         error = fillrtmsg(rtm, rt, rtinfo);
 660         if (!error && found) {
 661                 /* Got the exact match, we could return now! */
 662                 error = EJUSTRETURN;
 663         }
 664         return error;
 665 }
 666
 667 static int
 668 route_output_change_callback(int cmd, struct rt_addrinfo *rtinfo,
 669                              struct rtentry *rt, void *arg, int found_cnt)
 670 {
 671         struct rt_msghdr *rtm = arg;
 672         struct ifaddr *ifa;
 673         int error = 0;
 674
 675         /*
 676          * new gateway could require new ifaddr, ifp;
 677          * flags may also be different; ifp may be specified
 678          * by ll sockaddr when protocol address is ambiguous
 679          */
 680         if (((rt->rt_flags & RTF_GATEWAY) && rtinfo->rti_gateway != NULL) ||
 681             rtinfo->rti_ifpaddr != NULL ||
 682             (rtinfo->rti_ifaaddr != NULL &&
 683              !sa_equal(rtinfo->rti_ifaaddr, rt->rt_ifa->ifa_addr))) {
 684                 error = rt_getifa(rtinfo);
 685                 if (error != 0)
 686                         goto done;
 687         }
 688         if (rtinfo->rti_gateway != NULL) {
 689                 /*
 690                  * We only need to generate rtmsg upon the
 691                  * first route to be changed.
 692                  */
 693                 error = rt_setgate(rt, rt_key(rt), rtinfo->rti_gateway,
 694                         found_cnt == 1 ? RTL_REPORTMSG : RTL_DONTREPORT);
 695                 if (error != 0)
 696                         goto done;
 697         }
 698         if ((ifa = rtinfo->rti_ifa) != NULL) {
 699                 struct ifaddr *oifa = rt->rt_ifa;
 700
 701                 if (oifa != ifa) {
 702                         if (oifa && oifa->ifa_rtrequest)
 703                                 oifa->ifa_rtrequest(RTM_DELETE, rt, rtinfo);
 704                         IFAFREE(rt->rt_ifa);
 705                         IFAREF(ifa);
 706                         rt->rt_ifa = ifa;
 707                         rt->rt_ifp = rtinfo->rti_ifp;
 708                 }
 709         }
 710         rt_setmetrics(rtm->rtm_inits, &rtm->rtm_rmx, &rt->rt_rmx);
 711         if (rt->rt_ifa && rt->rt_ifa->ifa_rtrequest)
 712                 rt->rt_ifa->ifa_rtrequest(RTM_ADD, rt, rtinfo);
 713         if (rtinfo->rti_genmask != NULL) {
 714                 rt->rt_genmask = rtmask_purelookup(rtinfo->rti_genmask);
 715                 if (rt->rt_genmask == NULL) {
 716                         /*
 717                          * This should not happen, since we
 718                          * have already installed genmask
 719                          * on each CPU before we reach here.
 720                          */
 721                         panic("genmask is gone!?\n");
 722                 }
 723         }
 724         rtm->rtm_index = rt->rt_ifp->if_index;
 725 done:
 726         return error;
 727 }
 728
 729 static int
 730 route_output_lock_callback(int cmd, struct rt_addrinfo *rtinfo,
 731                            struct rtentry *rt, void *arg,
 732                            int found_cnt __unused)
 733 {
 734         struct rt_msghdr *rtm = arg;
 735
 736         rt->rt_rmx.rmx_locks &= ~(rtm->rtm_inits);
 737         rt->rt_rmx.rmx_locks |=
 738                 (rtm->rtm_inits & rtm->rtm_rmx.rmx_locks);
 739         return 0;
 740 }
 741
 742 static void
 743 rt_setmetrics(u_long which, struct rt_metrics *in, struct rt_metrics *out)
 744 {
 745 #define setmetric(flag, elt) if (which & (flag)) out->elt = in->elt;
 746         setmetric(RTV_RPIPE, rmx_recvpipe);
 747         setmetric(RTV_SPIPE, rmx_sendpipe);
 748         setmetric(RTV_SSTHRESH, rmx_ssthresh);
 749         setmetric(RTV_RTT, rmx_rtt);
 750         setmetric(RTV_RTTVAR, rmx_rttvar);
 751         setmetric(RTV_HOPCOUNT, rmx_hopcount);
 752         setmetric(RTV_MTU, rmx_mtu);
 753         setmetric(RTV_EXPIRE, rmx_expire);
 754 #undef setmetric
 755 }
 756
 757 #define ROUNDUP(a) \
 758         ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
 759
 760 /*
 761  * Extract the addresses of the passed sockaddrs.
 762  * Do a little sanity checking so as to avoid bad memory references.
 763  * This data is derived straight from userland.
 764  */
 765 static int
 766 rt_xaddrs(char *cp, char *cplim, struct rt_addrinfo *rtinfo)
 767 {
 768         struct sockaddr *sa;
 769         int i;
 770
 771         for (i = 0; (i < RTAX_MAX) && (cp < cplim); i++) {
 772                 if ((rtinfo->rti_addrs & (1 << i)) == 0)
 773                         continue;
 774                 sa = (struct sockaddr *)cp;
 775                 /*
 776                  * It won't fit.
 777                  */
 778                 if ((cp + sa->sa_len) > cplim) {
 779                         return (EINVAL);
 780                 }
 781
 782                 /*
 783                  * There are no more...  Quit now.
 784                  * If there are more bits, they are in error.
 785                  * I've seen this.  route(1) can evidently generate these.
 786                  * This causes kernel to core dump.
 787                  * For compatibility, if we see this, point to a safe address.
 788                  */
 789                 if (sa->sa_len == 0) {
 790                         static struct sockaddr sa_zero = {
 791                                 sizeof sa_zero, AF_INET,
 792                         };
 793
 794                         rtinfo->rti_info[i] = &sa_zero;
 795                         kprintf("rtsock: received more addr bits than sockaddrs.\n");
 796                         return (0); /* should be EINVAL but for compat */
 797                 }
 798
 799                 /* Accept the sockaddr. */
 800                 rtinfo->rti_info[i] = sa;
 801                 cp += ROUNDUP(sa->sa_len);
 802         }
 803         return (0);
 804 }
 805
 806 static int
 807 rt_msghdrsize(int type)
 808 {
 809         switch (type) {
 810         case RTM_DELADDR:
 811         case RTM_NEWADDR:
 812                 return sizeof(struct ifa_msghdr);
 813         case RTM_DELMADDR:
 814         case RTM_NEWMADDR:
 815                 return sizeof(struct ifma_msghdr);
 816         case RTM_IFINFO:
 817                 return sizeof(struct if_msghdr);
 818         case RTM_IFANNOUNCE:
 819         case RTM_IEEE80211:
 820                 return sizeof(struct if_announcemsghdr);
 821         default:
 822                 return sizeof(struct rt_msghdr);
 823         }
 824 }
 825
 826 static int
 827 rt_msgsize(int type, struct rt_addrinfo *rtinfo)
 828 {
 829         int len, i;
 830
 831         len = rt_msghdrsize(type);
 832         for (i = 0; i < RTAX_MAX; i++) {
 833                 if (rtinfo->rti_info[i] != NULL)
 834                         len += ROUNDUP(rtinfo->rti_info[i]->sa_len);
 835         }
 836         len = ALIGN(len);
 837         return len;
 838 }
 839
 840 /*
 841  * Build a routing message in a buffer.
 842  * Copy the addresses in the rtinfo->rti_info[] sockaddr array
 843  * to the end of the buffer after the message header.
 844  *
 845  * Set the rtinfo->rti_addrs bitmask of addresses present in rtinfo->rti_info[].
 846  * This side-effect can be avoided if we reorder the addrs bitmask field in all
 847  * the route messages to line up so we can set it here instead of back in the
 848  * calling routine.
 849  */
 850 static void
 851 rt_msg_buffer(int type, struct rt_addrinfo *rtinfo, void *buf, int msglen)
 852 {
 853         struct rt_msghdr *rtm;
 854         char *cp;
 855         int dlen, i;
 856
 857         rtm = (struct rt_msghdr *) buf;
 858         rtm->rtm_version = RTM_VERSION;
 859         rtm->rtm_type = type;
 860         rtm->rtm_msglen = msglen;
 861
 862         cp = (char *)buf + rt_msghdrsize(type);
 863         rtinfo->rti_addrs = 0;
 864         for (i = 0; i < RTAX_MAX; i++) {
 865                 struct sockaddr *sa;
 866
 867                 if ((sa = rtinfo->rti_info[i]) == NULL)
 868                         continue;
 869                 rtinfo->rti_addrs |= (1 << i);
 870                 dlen = ROUNDUP(sa->sa_len);
 871                 bcopy(sa, cp, dlen);
 872                 cp += dlen;
 873         }
 874 }
 875
 876 /*
 877  * Build a routing message in a mbuf chain.
 878  * Copy the addresses in the rtinfo->rti_info[] sockaddr array
 879  * to the end of the mbuf after the message header.
 880  *
 881  * Set the rtinfo->rti_addrs bitmask of addresses present in rtinfo->rti_info[].
 882  * This side-effect can be avoided if we reorder the addrs bitmask field in all
 883  * the route messages to line up so we can set it here instead of back in the
 884  * calling routine.
 885  */
 886 static struct mbuf *
 887 rt_msg_mbuf(int type, struct rt_addrinfo *rtinfo)
 888 {
 889         struct mbuf *m;
 890         struct rt_msghdr *rtm;
 891         int hlen, len;
 892         int i;
 893
 894         hlen = rt_msghdrsize(type);
 895         KASSERT(hlen <= MCLBYTES, ("rt_msg_mbuf: hlen %d doesn't fit", hlen));
 896
 897         m = m_getl(hlen, MB_DONTWAIT, MT_DATA, M_PKTHDR, NULL);
 898         if (m == NULL)
 899                 return (NULL);
 900         mbuftrackid(m, 32);
 901         m->m_pkthdr.len = m->m_len = hlen;
 902         m->m_pkthdr.rcvif = NULL;
 903         rtinfo->rti_addrs = 0;
 904         len = hlen;
 905         for (i = 0; i < RTAX_MAX; i++) {
 906                 struct sockaddr *sa;
 907                 int dlen;
 908
 909                 if ((sa = rtinfo->rti_info[i]) == NULL)
 910                         continue;
 911                 rtinfo->rti_addrs |= (1 << i);
 912                 dlen = ROUNDUP(sa->sa_len);
 913                 m_copyback(m, len, dlen, (caddr_t)sa); /* can grow mbuf chain */
 914                 len += dlen;
 915         }
 916         if (m->m_pkthdr.len != len) { /* one of the m_copyback() calls failed */
 917                 m_freem(m);
 918                 return (NULL);
 919         }
 920         rtm = mtod(m, struct rt_msghdr *);
 921         bzero(rtm, hlen);
 922         rtm->rtm_msglen = len;
 923         rtm->rtm_version = RTM_VERSION;
 924         rtm->rtm_type = type;
 925         return (m);
 926 }
 927
 928 /*
 929  * This routine is called to generate a message from the routing
 930  * socket indicating that a redirect has occurred, a routing lookup
 931  * has failed, or that a protocol has detected timeouts to a particular
 932  * destination.
 933  */
 934 void
 935 rt_missmsg(int type, struct rt_addrinfo *rtinfo, int flags, int error)
 936 {
 937         struct sockaddr *dst = rtinfo->rti_info[RTAX_DST];
 938         struct rt_msghdr *rtm;
 939         struct mbuf *m;
 940
 941         if (route_cb.any_count == 0)
 942                 return;
 943         m = rt_msg_mbuf(type, rtinfo);
 944         if (m == NULL)
 945                 return;
 946         rtm = mtod(m, struct rt_msghdr *);
 947         rtm->rtm_flags = RTF_DONE | flags;
 948         rtm->rtm_errno = error;
 949         rtm->rtm_addrs = rtinfo->rti_addrs;
 950         rts_input(m, familyof(dst));
 951 }
 952
 953 void
 954 rt_dstmsg(int type, struct sockaddr *dst, int error)
 955 {
 956         struct rt_msghdr *rtm;
 957         struct rt_addrinfo addrs;
 958         struct mbuf *m;
 959
 960         if (route_cb.any_count == 0)
 961                 return;
 962         bzero(&addrs, sizeof(struct rt_addrinfo));
 963         addrs.rti_info[RTAX_DST] = dst;
 964         m = rt_msg_mbuf(type, &addrs);
 965         if (m == NULL)
 966                 return;
 967         rtm = mtod(m, struct rt_msghdr *);
 968         rtm->rtm_flags = RTF_DONE;
 969         rtm->rtm_errno = error;
 970         rtm->rtm_addrs = addrs.rti_addrs;
 971         rts_input(m, familyof(dst));
 972 }
 973
 974 /*
 975  * This routine is called to generate a message from the routing
 976  * socket indicating that the status of a network interface has changed.
 977  */
 978 void
 979 rt_ifmsg(struct ifnet *ifp)
 980 {
 981         struct if_msghdr *ifm;
 982         struct mbuf *m;
 983         struct rt_addrinfo rtinfo;
 984
 985         if (route_cb.any_count == 0)
 986                 return;
 987         bzero(&rtinfo, sizeof(struct rt_addrinfo));
 988         m = rt_msg_mbuf(RTM_IFINFO, &rtinfo);
 989         if (m == NULL)
 990                 return;
 991         ifm = mtod(m, struct if_msghdr *);
 992         ifm->ifm_index = ifp->if_index;
 993         ifm->ifm_flags = ifp->if_flags;
 994         ifm->ifm_data = ifp->if_data;
 995         ifm->ifm_addrs = 0;
 996         rts_input(m, 0);
 997 }
 998
 999 static void
1000 rt_ifamsg(int cmd, struct ifaddr *ifa)
1001 {
1002         struct ifa_msghdr *ifam;
1003         struct rt_addrinfo rtinfo;
1004         struct mbuf *m;
1005         struct ifnet *ifp = ifa->ifa_ifp;
1006
1007         bzero(&rtinfo, sizeof(struct rt_addrinfo));
1008         rtinfo.rti_ifaaddr = ifa->ifa_addr;
1009         rtinfo.rti_ifpaddr =
1010                 TAILQ_FIRST(&ifp->if_addrheads[mycpuid])->ifa->ifa_addr;
1011         rtinfo.rti_netmask = ifa->ifa_netmask;
1012         rtinfo.rti_bcastaddr = ifa->ifa_dstaddr;
1013
1014         m = rt_msg_mbuf(cmd, &rtinfo);
1015         if (m == NULL)
1016                 return;
1017
1018         ifam = mtod(m, struct ifa_msghdr *);
1019         ifam->ifam_index = ifp->if_index;
1020         ifam->ifam_metric = ifa->ifa_metric;
1021         ifam->ifam_flags = ifa->ifa_flags;
1022         ifam->ifam_addrs = rtinfo.rti_addrs;
1023
1024         rts_input(m, familyof(ifa->ifa_addr));
1025 }
1026
1027 void
1028 rt_rtmsg(int cmd, struct rtentry *rt, struct ifnet *ifp, int error)
1029 {
1030         struct rt_msghdr *rtm;
1031         struct rt_addrinfo rtinfo;
1032         struct mbuf *m;
1033         struct sockaddr *dst;
1034
1035         if (rt == NULL)
1036                 return;
1037
1038         bzero(&rtinfo, sizeof(struct rt_addrinfo));
1039         rtinfo.rti_dst = dst = rt_key(rt);
1040         rtinfo.rti_gateway = rt->rt_gateway;
1041         rtinfo.rti_netmask = rt_mask(rt);
1042         if (ifp != NULL) {
1043                 rtinfo.rti_ifpaddr =
1044                 TAILQ_FIRST(&ifp->if_addrheads[mycpuid])->ifa->ifa_addr;
1045         }
1046         rtinfo.rti_ifaaddr = rt->rt_ifa->ifa_addr;
1047
1048         m = rt_msg_mbuf(cmd, &rtinfo);
1049         if (m == NULL)
1050                 return;
1051
1052         rtm = mtod(m, struct rt_msghdr *);
1053         if (ifp != NULL)
1054                 rtm->rtm_index = ifp->if_index;
1055         rtm->rtm_flags |= rt->rt_flags;
1056         rtm->rtm_errno = error;
1057         rtm->rtm_addrs = rtinfo.rti_addrs;
1058
1059         rts_input(m, familyof(dst));
1060 }
1061
1062 /*
1063  * This is called to generate messages from the routing socket
1064  * indicating a network interface has had addresses associated with it.
1065  * if we ever reverse the logic and replace messages TO the routing
1066  * socket indicate a request to configure interfaces, then it will
1067  * be unnecessary as the routing socket will automatically generate
1068  * copies of it.
1069  */
1070 void
1071 rt_newaddrmsg(int cmd, struct ifaddr *ifa, int error, struct rtentry *rt)
1072 {
1073 #ifdef SCTP
1074         /*
1075          * notify the SCTP stack
1076          * this will only get called when an address is added/deleted
1077          * XXX pass the ifaddr struct instead if ifa->ifa_addr...
1078          */
1079         if (cmd == RTM_ADD)
1080                 sctp_add_ip_address(ifa);
1081         else if (cmd == RTM_DELETE)
1082                 sctp_delete_ip_address(ifa);
1083 #endif /* SCTP */
1084
1085         if (route_cb.any_count == 0)
1086                 return;
1087
1088         if (cmd == RTM_ADD) {
1089                 rt_ifamsg(RTM_NEWADDR, ifa);
1090                 rt_rtmsg(RTM_ADD, rt, ifa->ifa_ifp, error);
1091         } else {
1092                 KASSERT((cmd == RTM_DELETE), ("unknown cmd %d", cmd));
1093                 rt_rtmsg(RTM_DELETE, rt, ifa->ifa_ifp, error);
1094                 rt_ifamsg(RTM_DELADDR, ifa);
1095         }
1096 }
1097
1098 /*
1099  * This is the analogue to the rt_newaddrmsg which performs the same
1100  * function but for multicast group memberhips.  This is easier since
1101  * there is no route state to worry about.
1102  */
1103 void
1104 rt_newmaddrmsg(int cmd, struct ifmultiaddr *ifma)
1105 {
1106         struct rt_addrinfo rtinfo;
1107         struct mbuf *m = NULL;
1108         struct ifnet *ifp = ifma->ifma_ifp;
1109         struct ifma_msghdr *ifmam;
1110
1111         if (route_cb.any_count == 0)
1112                 return;
1113
1114         bzero(&rtinfo, sizeof(struct rt_addrinfo));
1115         rtinfo.rti_ifaaddr = ifma->ifma_addr;
1116         if (ifp != NULL && !TAILQ_EMPTY(&ifp->if_addrheads[mycpuid])) {
1117                 rtinfo.rti_ifpaddr =
1118                 TAILQ_FIRST(&ifp->if_addrheads[mycpuid])->ifa->ifa_addr;
1119         }
1120         /*
1121          * If a link-layer address is present, present it as a ``gateway''
1122          * (similarly to how ARP entries, e.g., are presented).
1123          */
1124         rtinfo.rti_gateway = ifma->ifma_lladdr;
1125
1126         m = rt_msg_mbuf(cmd, &rtinfo);
1127         if (m == NULL)
1128                 return;
1129
1130         ifmam = mtod(m, struct ifma_msghdr *);
1131         ifmam->ifmam_index = ifp->if_index;
1132         ifmam->ifmam_addrs = rtinfo.rti_addrs;
1133
1134         rts_input(m, familyof(ifma->ifma_addr));
1135 }
1136
1137 static struct mbuf *
1138 rt_makeifannouncemsg(struct ifnet *ifp, int type, int what,
1139                      struct rt_addrinfo *info)
1140 {
1141         struct if_announcemsghdr *ifan;
1142         struct mbuf *m;
1143
1144         if (route_cb.any_count == 0)
1145                 return NULL;
1146
1147         bzero(info, sizeof(*info));
1148         m = rt_msg_mbuf(type, info);
1149         if (m == NULL)
1150                 return NULL;
1151
1152         ifan = mtod(m, struct if_announcemsghdr *);
1153         ifan->ifan_index = ifp->if_index;
1154         strlcpy(ifan->ifan_name, ifp->if_xname, sizeof ifan->ifan_name);
1155         ifan->ifan_what = what;
1156         return m;
1157 }
1158
1159 /*
1160  * This is called to generate routing socket messages indicating
1161  * IEEE80211 wireless events.
1162  * XXX we piggyback on the RTM_IFANNOUNCE msg format in a clumsy way.
1163  */
1164 void
1165 rt_ieee80211msg(struct ifnet *ifp, int what, void *data, size_t data_len)
1166 {
1167         struct rt_addrinfo info;
1168         struct mbuf *m;
1169
1170         m = rt_makeifannouncemsg(ifp, RTM_IEEE80211, what, &info);
1171         if (m == NULL)
1172                 return;
1173
1174         /*
1175          * Append the ieee80211 data.  Try to stick it in the
1176          * mbuf containing the ifannounce msg; otherwise allocate
1177          * a new mbuf and append.
1178          *
1179          * NB: we assume m is a single mbuf.
1180          */
1181         if (data_len > M_TRAILINGSPACE(m)) {
1182                 struct mbuf *n = m_get(MB_DONTWAIT, MT_DATA);
1183                 if (n == NULL) {
1184                         m_freem(m);
1185                         return;
1186                 }
1187                 bcopy(data, mtod(n, void *), data_len);
1188                 n->m_len = data_len;
1189                 m->m_next = n;
1190         } else if (data_len > 0) {
1191                 bcopy(data, mtod(m, u_int8_t *) + m->m_len, data_len);
1192                 m->m_len += data_len;
1193         }
1194         mbuftrackid(m, 33);
1195         if (m->m_flags & M_PKTHDR)
1196                 m->m_pkthdr.len += data_len;
1197         mtod(m, struct if_announcemsghdr *)->ifan_msglen += data_len;
1198         rts_input(m, 0);
1199 }
1200
1201 /*
1202  * This is called to generate routing socket messages indicating
1203  * network interface arrival and departure.
1204  */
1205 void
1206 rt_ifannouncemsg(struct ifnet *ifp, int what)
1207 {
1208         struct rt_addrinfo addrinfo;
1209         struct mbuf *m;
1210
1211         m = rt_makeifannouncemsg(ifp, RTM_IFANNOUNCE, what, &addrinfo);
1212         if (m != NULL)
1213                 rts_input(m, 0);
1214 }
1215
1216 static int
1217 resizewalkarg(struct walkarg *w, int len)
1218 {
1219         void *newptr;
1220
1221         newptr = kmalloc(len, M_RTABLE, M_INTWAIT | M_NULLOK);
1222         if (newptr == NULL)
1223                 return (ENOMEM);
1224         if (w->w_tmem != NULL)
1225                 kfree(w->w_tmem, M_RTABLE);
1226         w->w_tmem = newptr;
1227         w->w_tmemsize = len;
1228         return (0);
1229 }
1230
1231 /*
1232  * This is used in dumping the kernel table via sysctl().
1233  */
1234 int
1235 sysctl_dumpentry(struct radix_node *rn, void *vw)
1236 {
1237         struct walkarg *w = vw;
1238         struct rtentry *rt = (struct rtentry *)rn;
1239         struct rt_addrinfo rtinfo;
1240         int error, msglen;
1241
1242         if (w->w_op == NET_RT_FLAGS && !(rt->rt_flags & w->w_arg))
1243                 return 0;
1244
1245         bzero(&rtinfo, sizeof(struct rt_addrinfo));
1246         rtinfo.rti_dst = rt_key(rt);
1247         rtinfo.rti_gateway = rt->rt_gateway;
1248         rtinfo.rti_netmask = rt_mask(rt);
1249         rtinfo.rti_genmask = rt->rt_genmask;
1250         if (rt->rt_ifp != NULL) {
1251                 rtinfo.rti_ifpaddr =
1252                 TAILQ_FIRST(&rt->rt_ifp->if_addrheads[mycpuid])->ifa->ifa_addr;
1253                 rtinfo.rti_ifaaddr = rt->rt_ifa->ifa_addr;
1254                 if (rt->rt_ifp->if_flags & IFF_POINTOPOINT)
1255                         rtinfo.rti_bcastaddr = rt->rt_ifa->ifa_dstaddr;
1256         }
1257         msglen = rt_msgsize(RTM_GET, &rtinfo);
1258         if (w->w_tmemsize < msglen && resizewalkarg(w, msglen) != 0)
1259                 return (ENOMEM);
1260         rt_msg_buffer(RTM_GET, &rtinfo, w->w_tmem, msglen);
1261         if (w->w_req != NULL) {
1262                 struct rt_msghdr *rtm = w->w_tmem;
1263
1264                 rtm->rtm_flags = rt->rt_flags;
1265                 rtm->rtm_use = rt->rt_use;
1266                 rtm->rtm_rmx = rt->rt_rmx;
1267                 rtm->rtm_index = rt->rt_ifp->if_index;
1268                 rtm->rtm_errno = rtm->rtm_pid = rtm->rtm_seq = 0;
1269                 rtm->rtm_addrs = rtinfo.rti_addrs;
1270                 error = SYSCTL_OUT(w->w_req, rtm, msglen);
1271                 return (error);
1272         }
1273         return (0);
1274 }
1275
1276 static int
1277 sysctl_iflist(int af, struct walkarg *w)
1278 {
1279         struct ifnet *ifp;
1280         struct rt_addrinfo rtinfo;
1281         int msglen, error;
1282
1283         bzero(&rtinfo, sizeof(struct rt_addrinfo));
1284         TAILQ_FOREACH(ifp, &ifnet, if_link) {
1285                 struct ifaddr_container *ifac;
1286                 struct ifaddr *ifa;
1287
1288                 if (w->w_arg && w->w_arg != ifp->if_index)
1289                         continue;
1290                 ifac = TAILQ_FIRST(&ifp->if_addrheads[mycpuid]);
1291                 ifa = ifac->ifa;
1292                 rtinfo.rti_ifpaddr = ifa->ifa_addr;
1293                 msglen = rt_msgsize(RTM_IFINFO, &rtinfo);
1294                 if (w->w_tmemsize < msglen && resizewalkarg(w, msglen) != 0)
1295                         return (ENOMEM);
1296                 rt_msg_buffer(RTM_IFINFO, &rtinfo, w->w_tmem, msglen);
1297                 rtinfo.rti_ifpaddr = NULL;
1298                 if (w->w_req != NULL && w->w_tmem != NULL) {
1299                         struct if_msghdr *ifm = w->w_tmem;
1300
1301                         ifm->ifm_index = ifp->if_index;
1302                         ifm->ifm_flags = ifp->if_flags;
1303                         ifm->ifm_data = ifp->if_data;
1304                         ifm->ifm_addrs = rtinfo.rti_addrs;
1305                         error = SYSCTL_OUT(w->w_req, ifm, msglen);
1306                         if (error)
1307                                 return (error);
1308                 }
1309                 while ((ifac = TAILQ_NEXT(ifac, ifa_link)) != NULL) {
1310                         ifa = ifac->ifa;
1311
1312                         if (af && af != ifa->ifa_addr->sa_family)
1313                                 continue;
1314                         if (curproc->p_ucred->cr_prison &&
1315                             prison_if(curproc->p_ucred, ifa->ifa_addr))
1316                                 continue;
1317                         rtinfo.rti_ifaaddr = ifa->ifa_addr;
1318                         rtinfo.rti_netmask = ifa->ifa_netmask;
1319                         rtinfo.rti_bcastaddr = ifa->ifa_dstaddr;
1320                         msglen = rt_msgsize(RTM_NEWADDR, &rtinfo);
1321                         if (w->w_tmemsize < msglen &&
1322                             resizewalkarg(w, msglen) != 0)
1323                                 return (ENOMEM);
1324                         rt_msg_buffer(RTM_NEWADDR, &rtinfo, w->w_tmem, msglen);
1325                         if (w->w_req != NULL) {
1326                                 struct ifa_msghdr *ifam = w->w_tmem;
1327
1328                                 ifam->ifam_index = ifa->ifa_ifp->if_index;
1329                                 ifam->ifam_flags = ifa->ifa_flags;
1330                                 ifam->ifam_metric = ifa->ifa_metric;
1331                                 ifam->ifam_addrs = rtinfo.rti_addrs;
1332                                 error = SYSCTL_OUT(w->w_req, w->w_tmem, msglen);
1333                                 if (error)
1334                                         return (error);
1335                         }
1336                 }
1337                 rtinfo.rti_netmask = NULL;
1338                 rtinfo.rti_ifaaddr = NULL;
1339                 rtinfo.rti_bcastaddr = NULL;
1340         }
1341         return (0);
1342 }
1343
1344 static int
1345 sysctl_rtsock(SYSCTL_HANDLER_ARGS)
1346 {
1347         int     *name = (int *)arg1;
1348         u_int   namelen = arg2;
1349         struct radix_node_head *rnh;
1350         int     i, error = EINVAL;
1351         int     origcpu;
1352         u_char  af;
1353         struct  walkarg w;
1354
1355         name ++;
1356         namelen--;
1357         if (req->newptr)
1358                 return (EPERM);
1359         if (namelen != 3 && namelen != 4)
1360                 return (EINVAL);
1361         af = name[0];
1362         bzero(&w, sizeof w);
1363         w.w_op = name[1];
1364         w.w_arg = name[2];
1365         w.w_req = req;
1366
1367         /*
1368          * Optional third argument specifies cpu, used primarily for
1369          * debugging the route table.
1370          */
1371         if (namelen == 4) {
1372                 if (name[3] < 0 || name[3] >= ncpus)
1373                         return (EINVAL);
1374                 origcpu = mycpuid;
1375                 lwkt_migratecpu(name[3]);
1376         } else {
1377                 origcpu = -1;
1378         }
1379         crit_enter();
1380         switch (w.w_op) {
1381         case NET_RT_DUMP:
1382         case NET_RT_FLAGS:
1383                 for (i = 1; i <= AF_MAX; i++)
1384                         if ((rnh = rt_tables[mycpuid][i]) &&
1385                             (af == 0 || af == i) &&
1386                             (error = rnh->rnh_walktree(rnh,
1387                                                        sysctl_dumpentry, &w)))
1388                                 break;
1389                 break;
1390
1391         case NET_RT_IFLIST:
1392                 error = sysctl_iflist(af, &w);
1393         }
1394         crit_exit();
1395         if (w.w_tmem != NULL)
1396                 kfree(w.w_tmem, M_RTABLE);
1397         if (origcpu >= 0)
1398                 lwkt_migratecpu(origcpu);
1399         return (error);
1400 }
1401
1402 SYSCTL_NODE(_net, PF_ROUTE, routetable, CTLFLAG_RD, sysctl_rtsock, "");
1403
1404 /*
1405  * Definitions of protocols supported in the ROUTE domain.
1406  */
1407
1408 static struct domain routedomain;               /* or at least forward */
1409
1410 static struct protosw routesw[] = {
1411 { SOCK_RAW,     &routedomain,   0,              PR_ATOMIC|PR_ADDR,
1412   0,            route_output,   raw_ctlinput,   0,
1413   cpu0_soport,  cpu0_ctlport,
1414   raw_init,     0,              0,              0,
1415   &route_usrreqs
1416 }
1417 };
1418
1419 static struct domain routedomain = {
1420         PF_ROUTE, "route", NULL, NULL, NULL,
1421         routesw, &routesw[(sizeof routesw)/(sizeof routesw[0])],
1422 };
1423
1424 DOMAIN_SET(route);
1425