sys/net/if.c

   1 /*
   2  * Copyright (c) 1980, 1986, 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  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)if.c        8.3 (Berkeley) 1/4/94
  34  * $FreeBSD: src/sys/net/if.c,v 1.185 2004/03/13 02:35:03 brooks Exp $
  35  */
  36
  37 #include "opt_compat.h"
  38 #include "opt_inet6.h"
  39 #include "opt_inet.h"
  40 #include "opt_ifpoll.h"
  41
  42 #include <sys/param.h>
  43 #include <sys/malloc.h>
  44 #include <sys/mbuf.h>
  45 #include <sys/systm.h>
  46 #include <sys/proc.h>
  47 #include <sys/priv.h>
  48 #include <sys/protosw.h>
  49 #include <sys/socket.h>
  50 #include <sys/socketvar.h>
  51 #include <sys/socketops.h>
  52 #include <sys/protosw.h>
  53 #include <sys/kernel.h>
  54 #include <sys/ktr.h>
  55 #include <sys/mutex.h>
  56 #include <sys/sockio.h>
  57 #include <sys/syslog.h>
  58 #include <sys/sysctl.h>
  59 #include <sys/domain.h>
  60 #include <sys/thread.h>
  61 #include <sys/serialize.h>
  62 #include <sys/bus.h>
  63
  64 #include <sys/thread2.h>
  65 #include <sys/msgport2.h>
  66 #include <sys/mutex2.h>
  67
  68 #include <net/if.h>
  69 #include <net/if_arp.h>
  70 #include <net/if_dl.h>
  71 #include <net/if_types.h>
  72 #include <net/if_var.h>
  73 #include <net/ifq_var.h>
  74 #include <net/radix.h>
  75 #include <net/route.h>
  76 #include <net/if_clone.h>
  77 #include <net/netisr.h>
  78 #include <net/netmsg2.h>
  79
  80 #include <machine/atomic.h>
  81 #include <machine/stdarg.h>
  82 #include <machine/smp.h>
  83
  84 #if defined(INET) || defined(INET6)
  85 /*XXX*/
  86 #include <netinet/in.h>
  87 #include <netinet/in_var.h>
  88 #include <netinet/if_ether.h>
  89 #ifdef INET6
  90 #include <netinet6/in6_var.h>
  91 #include <netinet6/in6_ifattach.h>
  92 #endif
  93 #endif
  94
  95 #if defined(COMPAT_43)
  96 #include <emulation/43bsd/43bsd_socket.h>
  97 #endif /* COMPAT_43 */
  98
  99 struct netmsg_ifaddr {
 100         struct netmsg_base base;
 101         struct ifaddr   *ifa;
 102         struct ifnet    *ifp;
 103         int             tail;
 104 };
 105
 106 /*
 107  * System initialization
 108  */
 109 static void     if_attachdomain(void *);
 110 static void     if_attachdomain1(struct ifnet *);
 111 static int      ifconf(u_long, caddr_t, struct ucred *);
 112 static void     ifinit(void *);
 113 static void     ifnetinit(void *);
 114 static void     if_slowtimo(void *);
 115 static void     link_rtrequest(int, struct rtentry *, struct rt_addrinfo *);
 116 static int      if_rtdel(struct radix_node *, void *);
 117
 118 #ifdef INET6
 119 /*
 120  * XXX: declare here to avoid to include many inet6 related files..
 121  * should be more generalized?
 122  */
 123 extern void     nd6_setmtu(struct ifnet *);
 124 #endif
 125
 126 SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers");
 127 SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management");
 128
 129 SYSINIT(interfaces, SI_SUB_PROTO_IF, SI_ORDER_FIRST, ifinit, NULL)
 130 /* Must be after netisr_init */
 131 SYSINIT(ifnet, SI_SUB_PRE_DRIVERS, SI_ORDER_SECOND, ifnetinit, NULL)
 132
 133 static  if_com_alloc_t *if_com_alloc[256];
 134 static  if_com_free_t *if_com_free[256];
 135
 136 MALLOC_DEFINE(M_IFADDR, "ifaddr", "interface address");
 137 MALLOC_DEFINE(M_IFMADDR, "ether_multi", "link-level multicast address");
 138 MALLOC_DEFINE(M_IFNET, "ifnet", "interface structure");
 139
 140 int                     ifqmaxlen = IFQ_MAXLEN;
 141 struct ifnethead        ifnet = TAILQ_HEAD_INITIALIZER(ifnet);
 142
 143 struct callout          if_slowtimo_timer;
 144
 145 int                     if_index = 0;
 146 struct ifnet            **ifindex2ifnet = NULL;
 147 static struct thread    ifnet_threads[MAXCPU];
 148
 149 #define IFQ_KTR_STRING          "ifq=%p"
 150 #define IFQ_KTR_ARGS    struct ifaltq *ifq
 151 #ifndef KTR_IFQ
 152 #define KTR_IFQ                 KTR_ALL
 153 #endif
 154 KTR_INFO_MASTER(ifq);
 155 KTR_INFO(KTR_IFQ, ifq, enqueue, 0, IFQ_KTR_STRING, IFQ_KTR_ARGS);
 156 KTR_INFO(KTR_IFQ, ifq, dequeue, 1, IFQ_KTR_STRING, IFQ_KTR_ARGS);
 157 #define logifq(name, arg)       KTR_LOG(ifq_ ## name, arg)
 158
 159 #define IF_START_KTR_STRING     "ifp=%p"
 160 #define IF_START_KTR_ARGS       struct ifnet *ifp
 161 #ifndef KTR_IF_START
 162 #define KTR_IF_START            KTR_ALL
 163 #endif
 164 KTR_INFO_MASTER(if_start);
 165 KTR_INFO(KTR_IF_START, if_start, run, 0,
 166          IF_START_KTR_STRING, IF_START_KTR_ARGS);
 167 KTR_INFO(KTR_IF_START, if_start, sched, 1,
 168          IF_START_KTR_STRING, IF_START_KTR_ARGS);
 169 KTR_INFO(KTR_IF_START, if_start, avoid, 2,
 170          IF_START_KTR_STRING, IF_START_KTR_ARGS);
 171 KTR_INFO(KTR_IF_START, if_start, contend_sched, 3,
 172          IF_START_KTR_STRING, IF_START_KTR_ARGS);
 173 KTR_INFO(KTR_IF_START, if_start, chase_sched, 4,
 174          IF_START_KTR_STRING, IF_START_KTR_ARGS);
 175 #define logifstart(name, arg)   KTR_LOG(if_start_ ## name, arg)
 176
 177 TAILQ_HEAD(, ifg_group) ifg_head = TAILQ_HEAD_INITIALIZER(ifg_head);
 178
 179 /*
 180  * Network interface utility routines.
 181  *
 182  * Routines with ifa_ifwith* names take sockaddr *'s as
 183  * parameters.
 184  */
 185 /* ARGSUSED*/
 186 void
 187 ifinit(void *dummy)
 188 {
 189         struct ifnet *ifp;
 190
 191         callout_init(&if_slowtimo_timer);
 192
 193         crit_enter();
 194         TAILQ_FOREACH(ifp, &ifnet, if_link) {
 195                 if (ifp->if_snd.ifq_maxlen == 0) {
 196                         if_printf(ifp, "XXX: driver didn't set ifq_maxlen\n");
 197                         ifp->if_snd.ifq_maxlen = ifqmaxlen;
 198                 }
 199         }
 200         crit_exit();
 201
 202         if_slowtimo(0);
 203 }
 204
 205 static int
 206 if_start_cpuid(struct ifnet *ifp)
 207 {
 208         return ifp->if_cpuid;
 209 }
 210
 211 #ifdef IFPOLL_ENABLE
 212 static int
 213 if_start_cpuid_npoll(struct ifnet *ifp)
 214 {
 215         int poll_cpuid = ifp->if_npoll_cpuid;
 216
 217         if (poll_cpuid >= 0)
 218                 return poll_cpuid;
 219         else
 220                 return ifp->if_cpuid;
 221 }
 222 #endif
 223
 224 static void
 225 if_start_ipifunc(void *arg)
 226 {
 227         struct ifnet *ifp = arg;
 228         struct lwkt_msg *lmsg = &ifp->if_start_nmsg[mycpuid].lmsg;
 229
 230         crit_enter();
 231         if (lmsg->ms_flags & MSGF_DONE)
 232                 lwkt_sendmsg(netisr_portfn(mycpuid), lmsg);
 233         crit_exit();
 234 }
 235
 236 /*
 237  * Schedule ifnet.if_start on ifnet's CPU
 238  */
 239 static void
 240 if_start_schedule(struct ifnet *ifp)
 241 {
 242         int cpu;
 243
 244         cpu = ifp->if_start_cpuid(ifp);
 245         if (cpu != mycpuid)
 246                 lwkt_send_ipiq(globaldata_find(cpu), if_start_ipifunc, ifp);
 247         else
 248         if_start_ipifunc(ifp);
 249 }
 250
 251 /*
 252  * NOTE:
 253  * This function will release ifnet.if_start interlock,
 254  * if ifnet.if_start does not need to be scheduled
 255  */
 256 static __inline int
 257 if_start_need_schedule(struct ifaltq *ifq, int running)
 258 {
 259         if (!running || ifq_is_empty(ifq)
 260 #ifdef ALTQ
 261             || ifq->altq_tbr != NULL
 262 #endif
 263         ) {
 264                 ALTQ_LOCK(ifq);
 265                 /*
 266                  * ifnet.if_start interlock is released, if:
 267                  * 1) Hardware can not take any packets, due to
 268                  *    o  interface is marked down
 269                  *    o  hardware queue is full (IFF_OACTIVE)
 270                  *    Under the second situation, hardware interrupt
 271                  *    or polling(4) will call/schedule ifnet.if_start
 272                  *    when hardware queue is ready
 273                  * 2) There is not packet in the ifnet.if_snd.
 274                  *    Further ifq_dispatch or ifq_handoff will call/
 275                  *    schedule ifnet.if_start
 276                  * 3) TBR is used and it does not allow further
 277                  *    dequeueing.
 278                  *    TBR callout will call ifnet.if_start
 279                  */
 280                 if (!running || !ifq_data_ready(ifq)) {
 281                         ifq->altq_started = 0;
 282                         ALTQ_UNLOCK(ifq);
 283                         return 0;
 284                 }
 285                 ALTQ_UNLOCK(ifq);
 286         }
 287         return 1;
 288 }
 289
 290 static void
 291 if_start_dispatch(netmsg_t msg)
 292 {
 293         struct lwkt_msg *lmsg = &msg->base.lmsg;
 294         struct ifnet *ifp = lmsg->u.ms_resultp;
 295         struct ifaltq *ifq = &ifp->if_snd;
 296         int running = 0;
 297
 298         crit_enter();
 299         lwkt_replymsg(lmsg, 0); /* reply ASAP */
 300         crit_exit();
 301
 302         if (mycpuid != ifp->if_start_cpuid(ifp)) {
 303                 /*
 304                  * If the ifnet is still up, we need to
 305                  * chase its CPU change.
 306                  */
 307                 if (ifp->if_flags & IFF_UP) {
 308                         logifstart(chase_sched, ifp);
 309                         if_start_schedule(ifp);
 310                         return;
 311                 } else {
 312                         goto check;
 313                 }
 314         }
 315
 316         if (ifp->if_flags & IFF_UP) {
 317                 ifnet_serialize_tx(ifp); /* XXX try? */
 318                 if ((ifp->if_flags & IFF_OACTIVE) == 0) {
 319                         logifstart(run, ifp);
 320                         ifp->if_start(ifp);
 321                         if ((ifp->if_flags &
 322                         (IFF_OACTIVE | IFF_RUNNING)) == IFF_RUNNING)
 323                                 running = 1;
 324                 }
 325                 ifnet_deserialize_tx(ifp);
 326         }
 327 check:
 328         if (if_start_need_schedule(ifq, running)) {
 329                 crit_enter();
 330                 if (lmsg->ms_flags & MSGF_DONE) { /* XXX necessary? */
 331                         logifstart(sched, ifp);
 332                         lwkt_sendmsg(netisr_portfn(mycpuid), lmsg);
 333                 }
 334                 crit_exit();
 335         }
 336 }
 337
 338 /* Device driver ifnet.if_start helper function */
 339 void
 340 if_devstart(struct ifnet *ifp)
 341 {
 342         struct ifaltq *ifq = &ifp->if_snd;
 343         int running = 0;
 344
 345         ASSERT_IFNET_SERIALIZED_TX(ifp);
 346
 347         ALTQ_LOCK(ifq);
 348         if (ifq->altq_started || !ifq_data_ready(ifq)) {
 349                 logifstart(avoid, ifp);
 350                 ALTQ_UNLOCK(ifq);
 351                 return;
 352         }
 353         ifq->altq_started = 1;
 354         ALTQ_UNLOCK(ifq);
 355
 356         logifstart(run, ifp);
 357         ifp->if_start(ifp);
 358
 359         if ((ifp->if_flags & (IFF_OACTIVE | IFF_RUNNING)) == IFF_RUNNING)
 360                 running = 1;
 361
 362         if (if_start_need_schedule(ifq, running)) {
 363                 /*
 364                  * More data need to be transmitted, ifnet.if_start is
 365                  * scheduled on ifnet's CPU, and we keep going.
 366                  * NOTE: ifnet.if_start interlock is not released.
 367                  */
 368                 logifstart(sched, ifp);
 369                 if_start_schedule(ifp);
 370         }
 371 }
 372
 373 static void
 374 if_default_serialize(struct ifnet *ifp, enum ifnet_serialize slz __unused)
 375 {
 376         lwkt_serialize_enter(ifp->if_serializer);
 377 }
 378
 379 static void
 380 if_default_deserialize(struct ifnet *ifp, enum ifnet_serialize slz __unused)
 381 {
 382         lwkt_serialize_exit(ifp->if_serializer);
 383 }
 384
 385 static int
 386 if_default_tryserialize(struct ifnet *ifp, enum ifnet_serialize slz __unused)
 387 {
 388         return lwkt_serialize_try(ifp->if_serializer);
 389 }
 390
 391 #ifdef INVARIANTS
 392 static void
 393 if_default_serialize_assert(struct ifnet *ifp,
 394                             enum ifnet_serialize slz __unused,
 395                             boolean_t serialized)
 396 {
 397         if (serialized)
 398                 ASSERT_SERIALIZED(ifp->if_serializer);
 399         else
 400                 ASSERT_NOT_SERIALIZED(ifp->if_serializer);
 401 }
 402 #endif
 403
 404 /*
 405  * Attach an interface to the list of "active" interfaces.
 406  *
 407  * The serializer is optional.  If non-NULL access to the interface
 408  * may be MPSAFE.
 409  */
 410 void
 411 if_attach(struct ifnet *ifp, lwkt_serialize_t serializer)
 412 {
 413         unsigned socksize, ifasize;
 414         int namelen, masklen;
 415         struct sockaddr_dl *sdl;
 416         struct ifaddr *ifa;
 417         struct ifaltq *ifq;
 418         int i;
 419
 420         static int if_indexlim = 8;
 421
 422         if (ifp->if_serialize != NULL) {
 423                 KASSERT(ifp->if_deserialize != NULL &&
 424                         ifp->if_tryserialize != NULL &&
 425                         ifp->if_serialize_assert != NULL,
 426                         ("serialize functions are partially setup"));
 427
 428                 /*
 429                  * If the device supplies serialize functions,
 430                  * then clear if_serializer to catch any invalid
 431                  * usage of this field.
 432                  */
 433                 KASSERT(serializer == NULL,
 434                         ("both serialize functions and default serializer "
 435                          "are supplied"));
 436                 ifp->if_serializer = NULL;
 437         } else {
 438                 KASSERT(ifp->if_deserialize == NULL &&
 439                         ifp->if_tryserialize == NULL &&
 440                         ifp->if_serialize_assert == NULL,
 441                         ("serialize functions are partially setup"));
 442                 ifp->if_serialize = if_default_serialize;
 443                 ifp->if_deserialize = if_default_deserialize;
 444                 ifp->if_tryserialize = if_default_tryserialize;
 445 #ifdef INVARIANTS
 446                 ifp->if_serialize_assert = if_default_serialize_assert;
 447 #endif
 448
 449                 /*
 450                  * The serializer can be passed in from the device,
 451                  * allowing the same serializer to be used for both
 452                  * the interrupt interlock and the device queue.
 453                  * If not specified, the netif structure will use an
 454                  * embedded serializer.
 455                  */
 456                 if (serializer == NULL) {
 457                         serializer = &ifp->if_default_serializer;
 458                         lwkt_serialize_init(serializer);
 459                 }
 460                 ifp->if_serializer = serializer;
 461         }
 462
 463         ifp->if_start_cpuid = if_start_cpuid;
 464         ifp->if_cpuid = 0;
 465
 466 #ifdef IFPOLL_ENABLE
 467         /* Device is not in polling mode by default */
 468         ifp->if_npoll_cpuid = -1;
 469         if (ifp->if_npoll != NULL)
 470                 ifp->if_start_cpuid = if_start_cpuid_npoll;
 471 #endif
 472
 473         ifp->if_start_nmsg = kmalloc(ncpus * sizeof(*ifp->if_start_nmsg),
 474                                      M_LWKTMSG, M_WAITOK);
 475         for (i = 0; i < ncpus; ++i) {
 476                 netmsg_init(&ifp->if_start_nmsg[i], NULL, &netisr_adone_rport,
 477                             0, if_start_dispatch);
 478                 ifp->if_start_nmsg[i].lmsg.u.ms_resultp = ifp;
 479         }
 480
 481         mtx_init(&ifp->if_ioctl_mtx);
 482         mtx_lock(&ifp->if_ioctl_mtx);
 483
 484         TAILQ_INSERT_TAIL(&ifnet, ifp, if_link);
 485         ifp->if_index = ++if_index;
 486
 487         /*
 488          * XXX -
 489          * The old code would work if the interface passed a pre-existing
 490          * chain of ifaddrs to this code.  We don't trust our callers to
 491          * properly initialize the tailq, however, so we no longer allow
 492          * this unlikely case.
 493          */
 494         ifp->if_addrheads = kmalloc(ncpus * sizeof(struct ifaddrhead),
 495                                     M_IFADDR, M_WAITOK | M_ZERO);
 496         for (i = 0; i < ncpus; ++i)
 497                 TAILQ_INIT(&ifp->if_addrheads[i]);
 498
 499         TAILQ_INIT(&ifp->if_prefixhead);
 500         TAILQ_INIT(&ifp->if_multiaddrs);
 501         TAILQ_INIT(&ifp->if_groups);
 502         getmicrotime(&ifp->if_lastchange);
 503         if (ifindex2ifnet == NULL || if_index >= if_indexlim) {
 504                 unsigned int n;
 505                 struct ifnet **q;
 506
 507                 if_indexlim <<= 1;
 508
 509                 /* grow ifindex2ifnet */
 510                 n = if_indexlim * sizeof(*q);
 511                 q = kmalloc(n, M_IFADDR, M_WAITOK | M_ZERO);
 512                 if (ifindex2ifnet) {
 513                         bcopy(ifindex2ifnet, q, n/2);
 514                         kfree(ifindex2ifnet, M_IFADDR);
 515                 }
 516                 ifindex2ifnet = q;
 517         }
 518
 519         ifindex2ifnet[if_index] = ifp;
 520
 521         /*
 522          * create a Link Level name for this device
 523          */
 524         namelen = strlen(ifp->if_xname);
 525         masklen = offsetof(struct sockaddr_dl, sdl_data[0]) + namelen;
 526         socksize = masklen + ifp->if_addrlen;
 527 #define ROUNDUP(a) (1 + (((a) - 1) | (sizeof(long) - 1)))
 528         if (socksize < sizeof(*sdl))
 529                 socksize = sizeof(*sdl);
 530         socksize = ROUNDUP(socksize);
 531 #undef ROUNDUP
 532         ifasize = sizeof(struct ifaddr) + 2 * socksize;
 533         ifa = ifa_create(ifasize, M_WAITOK);
 534         sdl = (struct sockaddr_dl *)(ifa + 1);
 535         sdl->sdl_len = socksize;
 536         sdl->sdl_family = AF_LINK;
 537         bcopy(ifp->if_xname, sdl->sdl_data, namelen);
 538         sdl->sdl_nlen = namelen;
 539         sdl->sdl_index = ifp->if_index;
 540         sdl->sdl_type = ifp->if_type;
 541         ifp->if_lladdr = ifa;
 542         ifa->ifa_ifp = ifp;
 543         ifa->ifa_rtrequest = link_rtrequest;
 544         ifa->ifa_addr = (struct sockaddr *)sdl;
 545         sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl);
 546         ifa->ifa_netmask = (struct sockaddr *)sdl;
 547         sdl->sdl_len = masklen;
 548         while (namelen != 0)
 549                 sdl->sdl_data[--namelen] = 0xff;
 550         ifa_iflink(ifa, ifp, 0 /* Insert head */);
 551
 552         EVENTHANDLER_INVOKE(ifnet_attach_event, ifp);
 553         devctl_notify("IFNET", ifp->if_xname, "ATTACH", NULL);
 554
 555         ifq = &ifp->if_snd;
 556         ifq->altq_type = 0;
 557         ifq->altq_disc = NULL;
 558         ifq->altq_flags &= ALTQF_CANTCHANGE;
 559         ifq->altq_tbr = NULL;
 560         ifq->altq_ifp = ifp;
 561         ifq->altq_started = 0;
 562         ifq->altq_prepended = NULL;
 563         ALTQ_LOCK_INIT(ifq);
 564         ifq_set_classic(ifq);
 565
 566         if (!SLIST_EMPTY(&domains))
 567                 if_attachdomain1(ifp);
 568
 569         /* Announce the interface. */
 570         rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
 571
 572         mtx_unlock(&ifp->if_ioctl_mtx);
 573 }
 574
 575 static void
 576 if_attachdomain(void *dummy)
 577 {
 578         struct ifnet *ifp;
 579
 580         crit_enter();
 581         TAILQ_FOREACH(ifp, &ifnet, if_list)
 582                 if_attachdomain1(ifp);
 583         crit_exit();
 584 }
 585 SYSINIT(domainifattach, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_FIRST,
 586         if_attachdomain, NULL);
 587
 588 static void
 589 if_attachdomain1(struct ifnet *ifp)
 590 {
 591         struct domain *dp;
 592
 593         crit_enter();
 594
 595         /* address family dependent data region */
 596         bzero(ifp->if_afdata, sizeof(ifp->if_afdata));
 597         SLIST_FOREACH(dp, &domains, dom_next)
 598                 if (dp->dom_ifattach)
 599                         ifp->if_afdata[dp->dom_family] =
 600                                 (*dp->dom_ifattach)(ifp);
 601         crit_exit();
 602 }
 603
 604 /*
 605  * Purge all addresses whose type is _not_ AF_LINK
 606  */
 607 void
 608 if_purgeaddrs_nolink(struct ifnet *ifp)
 609 {
 610         struct ifaddr_container *ifac, *next;
 611
 612         TAILQ_FOREACH_MUTABLE(ifac, &ifp->if_addrheads[mycpuid],
 613                               ifa_link, next) {
 614                 struct ifaddr *ifa = ifac->ifa;
 615
 616                 /* Leave link ifaddr as it is */
 617                 if (ifa->ifa_addr->sa_family == AF_LINK)
 618                         continue;
 619 #ifdef INET
 620                 /* XXX: Ugly!! ad hoc just for INET */
 621                 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) {
 622                         struct ifaliasreq ifr;
 623 #ifdef IFADDR_DEBUG_VERBOSE
 624                         int i;
 625
 626                         kprintf("purge in4 addr %p: ", ifa);
 627                         for (i = 0; i < ncpus; ++i)
 628                                 kprintf("%d ", ifa->ifa_containers[i].ifa_refcnt);
 629                         kprintf("\n");
 630 #endif
 631
 632                         bzero(&ifr, sizeof ifr);
 633                         ifr.ifra_addr = *ifa->ifa_addr;
 634                         if (ifa->ifa_dstaddr)
 635                                 ifr.ifra_broadaddr = *ifa->ifa_dstaddr;
 636                         if (in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr, ifp,
 637                                        NULL) == 0)
 638                                 continue;
 639                 }
 640 #endif /* INET */
 641 #ifdef INET6
 642                 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET6) {
 643 #ifdef IFADDR_DEBUG_VERBOSE
 644                         int i;
 645
 646                         kprintf("purge in6 addr %p: ", ifa);
 647                         for (i = 0; i < ncpus; ++i)
 648                                 kprintf("%d ", ifa->ifa_containers[i].ifa_refcnt);
 649                         kprintf("\n");
 650 #endif
 651
 652                         in6_purgeaddr(ifa);
 653                         /* ifp_addrhead is already updated */
 654                         continue;
 655                 }
 656 #endif /* INET6 */
 657                 ifa_ifunlink(ifa, ifp);
 658                 ifa_destroy(ifa);
 659         }
 660 }
 661
 662 /*
 663  * Detach an interface, removing it from the
 664  * list of "active" interfaces.
 665  */
 666 void
 667 if_detach(struct ifnet *ifp)
 668 {
 669         struct radix_node_head  *rnh;
 670         int i;
 671         int cpu, origcpu;
 672         struct domain *dp;
 673
 674         EVENTHANDLER_INVOKE(ifnet_detach_event, ifp);
 675
 676         /*
 677          * Remove routes and flush queues.
 678          */
 679         crit_enter();
 680 #ifdef IFPOLL_ENABLE
 681         if (ifp->if_flags & IFF_NPOLLING)
 682                 ifpoll_deregister(ifp);
 683 #endif
 684         if_down(ifp);
 685
 686 #ifdef ALTQ
 687         if (ifq_is_enabled(&ifp->if_snd))
 688                 altq_disable(&ifp->if_snd);
 689         if (ifq_is_attached(&ifp->if_snd))
 690                 altq_detach(&ifp->if_snd);
 691 #endif
 692
 693         /*
 694          * Clean up all addresses.
 695          */
 696         ifp->if_lladdr = NULL;
 697
 698         if_purgeaddrs_nolink(ifp);
 699         if (!TAILQ_EMPTY(&ifp->if_addrheads[mycpuid])) {
 700                 struct ifaddr *ifa;
 701
 702                 ifa = TAILQ_FIRST(&ifp->if_addrheads[mycpuid])->ifa;
 703                 KASSERT(ifa->ifa_addr->sa_family == AF_LINK,
 704                         ("non-link ifaddr is left on if_addrheads"));
 705
 706                 ifa_ifunlink(ifa, ifp);
 707                 ifa_destroy(ifa);
 708                 KASSERT(TAILQ_EMPTY(&ifp->if_addrheads[mycpuid]),
 709                         ("there are still ifaddrs left on if_addrheads"));
 710         }
 711
 712 #ifdef INET
 713         /*
 714          * Remove all IPv4 kernel structures related to ifp.
 715          */
 716         in_ifdetach(ifp);
 717 #endif
 718
 719 #ifdef INET6
 720         /*
 721          * Remove all IPv6 kernel structs related to ifp.  This should be done
 722          * before removing routing entries below, since IPv6 interface direct
 723          * routes are expected to be removed by the IPv6-specific kernel API.
 724          * Otherwise, the kernel will detect some inconsistency and bark it.
 725          */
 726         in6_ifdetach(ifp);
 727 #endif
 728
 729         /*
 730          * Delete all remaining routes using this interface
 731          * Unfortuneatly the only way to do this is to slog through
 732          * the entire routing table looking for routes which point
 733          * to this interface...oh well...
 734          */
 735         origcpu = mycpuid;
 736         for (cpu = 0; cpu < ncpus; cpu++) {
 737                 lwkt_migratecpu(cpu);
 738                 for (i = 1; i <= AF_MAX; i++) {
 739                         if ((rnh = rt_tables[cpu][i]) == NULL)
 740                                 continue;
 741                         rnh->rnh_walktree(rnh, if_rtdel, ifp);
 742                 }
 743         }
 744         lwkt_migratecpu(origcpu);
 745
 746         /* Announce that the interface is gone. */
 747         rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
 748         devctl_notify("IFNET", ifp->if_xname, "DETACH", NULL);
 749
 750         SLIST_FOREACH(dp, &domains, dom_next)
 751                 if (dp->dom_ifdetach && ifp->if_afdata[dp->dom_family])
 752                         (*dp->dom_ifdetach)(ifp,
 753                                 ifp->if_afdata[dp->dom_family]);
 754
 755         /*
 756          * Remove interface from ifindex2ifp[] and maybe decrement if_index.
 757          */
 758         ifindex2ifnet[ifp->if_index] = NULL;
 759         while (if_index > 0 && ifindex2ifnet[if_index] == NULL)
 760                 if_index--;
 761
 762         TAILQ_REMOVE(&ifnet, ifp, if_link);
 763         kfree(ifp->if_addrheads, M_IFADDR);
 764         kfree(ifp->if_start_nmsg, M_LWKTMSG);
 765         crit_exit();
 766 }
 767
 768 /*
 769  * Create interface group without members
 770  */
 771 struct ifg_group *
 772 if_creategroup(const char *groupname)
 773 {
 774         struct ifg_group        *ifg = NULL;
 775
 776         if ((ifg = (struct ifg_group *)kmalloc(sizeof(struct ifg_group),
 777             M_TEMP, M_NOWAIT)) == NULL)
 778                 return (NULL);
 779
 780         strlcpy(ifg->ifg_group, groupname, sizeof(ifg->ifg_group));
 781         ifg->ifg_refcnt = 0;
 782         ifg->ifg_carp_demoted = 0;
 783         TAILQ_INIT(&ifg->ifg_members);
 784 #if NPF > 0
 785         pfi_attach_ifgroup(ifg);
 786 #endif
 787         TAILQ_INSERT_TAIL(&ifg_head, ifg, ifg_next);
 788
 789         return (ifg);
 790 }
 791
 792 /*
 793  * Add a group to an interface
 794  */
 795 int
 796 if_addgroup(struct ifnet *ifp, const char *groupname)
 797 {
 798         struct ifg_list         *ifgl;
 799         struct ifg_group        *ifg = NULL;
 800         struct ifg_member       *ifgm;
 801
 802         if (groupname[0] && groupname[strlen(groupname) - 1] >= '0' &&
 803             groupname[strlen(groupname) - 1] <= '9')
 804                 return (EINVAL);
 805
 806         TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next)
 807                 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname))
 808                         return (EEXIST);
 809
 810         if ((ifgl = kmalloc(sizeof(*ifgl), M_TEMP, M_NOWAIT)) == NULL)
 811                 return (ENOMEM);
 812
 813         if ((ifgm = kmalloc(sizeof(*ifgm), M_TEMP, M_NOWAIT)) == NULL) {
 814                 kfree(ifgl, M_TEMP);
 815                 return (ENOMEM);
 816         }
 817
 818         TAILQ_FOREACH(ifg, &ifg_head, ifg_next)
 819                 if (!strcmp(ifg->ifg_group, groupname))
 820                         break;
 821
 822         if (ifg == NULL && (ifg = if_creategroup(groupname)) == NULL) {
 823                 kfree(ifgl, M_TEMP);
 824                 kfree(ifgm, M_TEMP);
 825                 return (ENOMEM);
 826         }
 827
 828         ifg->ifg_refcnt++;
 829         ifgl->ifgl_group = ifg;
 830         ifgm->ifgm_ifp = ifp;
 831
 832         TAILQ_INSERT_TAIL(&ifg->ifg_members, ifgm, ifgm_next);
 833         TAILQ_INSERT_TAIL(&ifp->if_groups, ifgl, ifgl_next);
 834
 835 #if NPF > 0
 836         pfi_group_change(groupname);
 837 #endif
 838
 839         return (0);
 840 }
 841
 842 /*
 843  * Remove a group from an interface
 844  */
 845 int
 846 if_delgroup(struct ifnet *ifp, const char *groupname)
 847 {
 848         struct ifg_list         *ifgl;
 849         struct ifg_member       *ifgm;
 850
 851         TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next)
 852                 if (!strcmp(ifgl->ifgl_group->ifg_group, groupname))
 853                         break;
 854         if (ifgl == NULL)
 855                 return (ENOENT);
 856
 857         TAILQ_REMOVE(&ifp->if_groups, ifgl, ifgl_next);
 858
 859         TAILQ_FOREACH(ifgm, &ifgl->ifgl_group->ifg_members, ifgm_next)
 860                 if (ifgm->ifgm_ifp == ifp)
 861                         break;
 862
 863         if (ifgm != NULL) {
 864                 TAILQ_REMOVE(&ifgl->ifgl_group->ifg_members, ifgm, ifgm_next);
 865                 kfree(ifgm, M_TEMP);
 866         }
 867
 868         if (--ifgl->ifgl_group->ifg_refcnt == 0) {
 869                 TAILQ_REMOVE(&ifg_head, ifgl->ifgl_group, ifg_next);
 870 #if NPF > 0
 871                 pfi_detach_ifgroup(ifgl->ifgl_group);
 872 #endif
 873                 kfree(ifgl->ifgl_group, M_TEMP);
 874         }
 875
 876         kfree(ifgl, M_TEMP);
 877
 878 #if NPF > 0
 879         pfi_group_change(groupname);
 880 #endif
 881
 882         return (0);
 883 }
 884
 885 /*
 886  * Stores all groups from an interface in memory pointed
 887  * to by data
 888  */
 889 int
 890 if_getgroup(caddr_t data, struct ifnet *ifp)
 891 {
 892         int                      len, error;
 893         struct ifg_list         *ifgl;
 894         struct ifg_req           ifgrq, *ifgp;
 895         struct ifgroupreq       *ifgr = (struct ifgroupreq *)data;
 896
 897         if (ifgr->ifgr_len == 0) {
 898                 TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next)
 899                         ifgr->ifgr_len += sizeof(struct ifg_req);
 900                 return (0);
 901         }
 902
 903         len = ifgr->ifgr_len;
 904         ifgp = ifgr->ifgr_groups;
 905         TAILQ_FOREACH(ifgl, &ifp->if_groups, ifgl_next) {
 906                 if (len < sizeof(ifgrq))
 907                         return (EINVAL);
 908                 bzero(&ifgrq, sizeof ifgrq);
 909                 strlcpy(ifgrq.ifgrq_group, ifgl->ifgl_group->ifg_group,
 910                     sizeof(ifgrq.ifgrq_group));
 911                 if ((error = copyout((caddr_t)&ifgrq, (caddr_t)ifgp,
 912                     sizeof(struct ifg_req))))
 913                         return (error);
 914                 len -= sizeof(ifgrq);
 915                 ifgp++;
 916         }
 917
 918         return (0);
 919 }
 920
 921 /*
 922  * Stores all members of a group in memory pointed to by data
 923  */
 924 int
 925 if_getgroupmembers(caddr_t data)
 926 {
 927         struct ifgroupreq       *ifgr = (struct ifgroupreq *)data;
 928         struct ifg_group        *ifg;
 929         struct ifg_member       *ifgm;
 930         struct ifg_req           ifgrq, *ifgp;
 931         int                      len, error;
 932
 933         TAILQ_FOREACH(ifg, &ifg_head, ifg_next)
 934                 if (!strcmp(ifg->ifg_group, ifgr->ifgr_name))
 935                         break;
 936         if (ifg == NULL)
 937                 return (ENOENT);
 938
 939         if (ifgr->ifgr_len == 0) {
 940                 TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next)
 941                         ifgr->ifgr_len += sizeof(ifgrq);
 942                 return (0);
 943         }
 944
 945         len = ifgr->ifgr_len;
 946         ifgp = ifgr->ifgr_groups;
 947         TAILQ_FOREACH(ifgm, &ifg->ifg_members, ifgm_next) {
 948                 if (len < sizeof(ifgrq))
 949                         return (EINVAL);
 950                 bzero(&ifgrq, sizeof ifgrq);
 951                 strlcpy(ifgrq.ifgrq_member, ifgm->ifgm_ifp->if_xname,
 952                     sizeof(ifgrq.ifgrq_member));
 953                 if ((error = copyout((caddr_t)&ifgrq, (caddr_t)ifgp,
 954                     sizeof(struct ifg_req))))
 955                         return (error);
 956                 len -= sizeof(ifgrq);
 957                 ifgp++;
 958         }
 959
 960         return (0);
 961 }
 962
 963 /*
 964  * Delete Routes for a Network Interface
 965  *
 966  * Called for each routing entry via the rnh->rnh_walktree() call above
 967  * to delete all route entries referencing a detaching network interface.
 968  *
 969  * Arguments:
 970  *      rn      pointer to node in the routing table
 971  *      arg     argument passed to rnh->rnh_walktree() - detaching interface
 972  *
 973  * Returns:
 974  *      0       successful
 975  *      errno   failed - reason indicated
 976  *
 977  */
 978 static int
 979 if_rtdel(struct radix_node *rn, void *arg)
 980 {
 981         struct rtentry  *rt = (struct rtentry *)rn;
 982         struct ifnet    *ifp = arg;
 983         int             err;
 984
 985         if (rt->rt_ifp == ifp) {
 986
 987                 /*
 988                  * Protect (sorta) against walktree recursion problems
 989                  * with cloned routes
 990                  */
 991                 if (!(rt->rt_flags & RTF_UP))
 992                         return (0);
 993
 994                 err = rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway,
 995                                 rt_mask(rt), rt->rt_flags,
 996                                 NULL);
 997                 if (err) {
 998                         log(LOG_WARNING, "if_rtdel: error %d\n", err);
 999                 }
1000         }
1001
1002         return (0);
1003 }
1004
1005 /*
1006  * Locate an interface based on a complete address.
1007  */
1008 struct ifaddr *
1009 ifa_ifwithaddr(struct sockaddr *addr)
1010 {
1011         struct ifnet *ifp;
1012
1013         TAILQ_FOREACH(ifp, &ifnet, if_link) {
1014                 struct ifaddr_container *ifac;
1015
1016                 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
1017                         struct ifaddr *ifa = ifac->ifa;
1018
1019                         if (ifa->ifa_addr->sa_family != addr->sa_family)
1020                                 continue;
1021                         if (sa_equal(addr, ifa->ifa_addr))
1022                                 return (ifa);
1023                         if ((ifp->if_flags & IFF_BROADCAST) &&
1024                             ifa->ifa_broadaddr &&
1025                             /* IPv6 doesn't have broadcast */
1026                             ifa->ifa_broadaddr->sa_len != 0 &&
1027                             sa_equal(ifa->ifa_broadaddr, addr))
1028                                 return (ifa);
1029                 }
1030         }
1031         return (NULL);
1032 }
1033 /*
1034  * Locate the point to point interface with a given destination address.
1035  */
1036 struct ifaddr *
1037 ifa_ifwithdstaddr(struct sockaddr *addr)
1038 {
1039         struct ifnet *ifp;
1040
1041         TAILQ_FOREACH(ifp, &ifnet, if_link) {
1042                 struct ifaddr_container *ifac;
1043
1044                 if (!(ifp->if_flags & IFF_POINTOPOINT))
1045                         continue;
1046
1047                 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
1048                         struct ifaddr *ifa = ifac->ifa;
1049
1050                         if (ifa->ifa_addr->sa_family != addr->sa_family)
1051                                 continue;
1052                         if (ifa->ifa_dstaddr &&
1053                             sa_equal(addr, ifa->ifa_dstaddr))
1054                                 return (ifa);
1055                 }
1056         }
1057         return (NULL);
1058 }
1059
1060 /*
1061  * Find an interface on a specific network.  If many, choice
1062  * is most specific found.
1063  */
1064 struct ifaddr *
1065 ifa_ifwithnet(struct sockaddr *addr)
1066 {
1067         struct ifnet *ifp;
1068         struct ifaddr *ifa_maybe = NULL;
1069         u_int af = addr->sa_family;
1070         char *addr_data = addr->sa_data, *cplim;
1071
1072         /*
1073          * AF_LINK addresses can be looked up directly by their index number,
1074          * so do that if we can.
1075          */
1076         if (af == AF_LINK) {
1077                 struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr;
1078
1079                 if (sdl->sdl_index && sdl->sdl_index <= if_index)
1080                         return (ifindex2ifnet[sdl->sdl_index]->if_lladdr);
1081         }
1082
1083         /*
1084          * Scan though each interface, looking for ones that have
1085          * addresses in this address family.
1086          */
1087         TAILQ_FOREACH(ifp, &ifnet, if_link) {
1088                 struct ifaddr_container *ifac;
1089
1090                 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
1091                         struct ifaddr *ifa = ifac->ifa;
1092                         char *cp, *cp2, *cp3;
1093
1094                         if (ifa->ifa_addr->sa_family != af)
1095 next:                           continue;
1096                         if (af == AF_INET && ifp->if_flags & IFF_POINTOPOINT) {
1097                                 /*
1098                                  * This is a bit broken as it doesn't
1099                                  * take into account that the remote end may
1100                                  * be a single node in the network we are
1101                                  * looking for.
1102                                  * The trouble is that we don't know the
1103                                  * netmask for the remote end.
1104                                  */
1105                                 if (ifa->ifa_dstaddr != NULL &&
1106                                     sa_equal(addr, ifa->ifa_dstaddr))
1107                                         return (ifa);
1108                         } else {
1109                                 /*
1110                                  * if we have a special address handler,
1111                                  * then use it instead of the generic one.
1112                                  */
1113                                 if (ifa->ifa_claim_addr) {
1114                                         if ((*ifa->ifa_claim_addr)(ifa, addr)) {
1115                                                 return (ifa);
1116                                         } else {
1117                                                 continue;
1118                                         }
1119                                 }
1120
1121                                 /*
1122                                  * Scan all the bits in the ifa's address.
1123                                  * If a bit dissagrees with what we are
1124                                  * looking for, mask it with the netmask
1125                                  * to see if it really matters.
1126                                  * (A byte at a time)
1127                                  */
1128                                 if (ifa->ifa_netmask == 0)
1129                                         continue;
1130                                 cp = addr_data;
1131                                 cp2 = ifa->ifa_addr->sa_data;
1132                                 cp3 = ifa->ifa_netmask->sa_data;
1133                                 cplim = ifa->ifa_netmask->sa_len +
1134                                         (char *)ifa->ifa_netmask;
1135                                 while (cp3 < cplim)
1136                                         if ((*cp++ ^ *cp2++) & *cp3++)
1137                                                 goto next; /* next address! */
1138                                 /*
1139                                  * If the netmask of what we just found
1140                                  * is more specific than what we had before
1141                                  * (if we had one) then remember the new one
1142                                  * before continuing to search
1143                                  * for an even better one.
1144                                  */
1145                                 if (ifa_maybe == NULL ||
1146                                     rn_refines((char *)ifa->ifa_netmask,
1147                                                (char *)ifa_maybe->ifa_netmask))
1148                                         ifa_maybe = ifa;
1149                         }
1150                 }
1151         }
1152         return (ifa_maybe);
1153 }
1154
1155 /*
1156  * Find an interface address specific to an interface best matching
1157  * a given address.
1158  */
1159 struct ifaddr *
1160 ifaof_ifpforaddr(struct sockaddr *addr, struct ifnet *ifp)
1161 {
1162         struct ifaddr_container *ifac;
1163         char *cp, *cp2, *cp3;
1164         char *cplim;
1165         struct ifaddr *ifa_maybe = NULL;
1166         u_int af = addr->sa_family;
1167
1168         if (af >= AF_MAX)
1169                 return (0);
1170         TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
1171                 struct ifaddr *ifa = ifac->ifa;
1172
1173                 if (ifa->ifa_addr->sa_family != af)
1174                         continue;
1175                 if (ifa_maybe == NULL)
1176                         ifa_maybe = ifa;
1177                 if (ifa->ifa_netmask == NULL) {
1178                         if (sa_equal(addr, ifa->ifa_addr) ||
1179                             (ifa->ifa_dstaddr != NULL &&
1180                              sa_equal(addr, ifa->ifa_dstaddr)))
1181                                 return (ifa);
1182                         continue;
1183                 }
1184                 if (ifp->if_flags & IFF_POINTOPOINT) {
1185                         if (sa_equal(addr, ifa->ifa_dstaddr))
1186                                 return (ifa);
1187                 } else {
1188                         cp = addr->sa_data;
1189                         cp2 = ifa->ifa_addr->sa_data;
1190                         cp3 = ifa->ifa_netmask->sa_data;
1191                         cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask;
1192                         for (; cp3 < cplim; cp3++)
1193                                 if ((*cp++ ^ *cp2++) & *cp3)
1194                                         break;
1195                         if (cp3 == cplim)
1196                                 return (ifa);
1197                 }
1198         }
1199         return (ifa_maybe);
1200 }
1201
1202 /*
1203  * Default action when installing a route with a Link Level gateway.
1204  * Lookup an appropriate real ifa to point to.
1205  * This should be moved to /sys/net/link.c eventually.
1206  */
1207 static void
1208 link_rtrequest(int cmd, struct rtentry *rt, struct rt_addrinfo *info)
1209 {
1210         struct ifaddr *ifa;
1211         struct sockaddr *dst;
1212         struct ifnet *ifp;
1213
1214         if (cmd != RTM_ADD || (ifa = rt->rt_ifa) == NULL ||
1215             (ifp = ifa->ifa_ifp) == NULL || (dst = rt_key(rt)) == NULL)
1216                 return;
1217         ifa = ifaof_ifpforaddr(dst, ifp);
1218         if (ifa != NULL) {
1219                 IFAFREE(rt->rt_ifa);
1220                 IFAREF(ifa);
1221                 rt->rt_ifa = ifa;
1222                 if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest)
1223                         ifa->ifa_rtrequest(cmd, rt, info);
1224         }
1225 }
1226
1227 /*
1228  * Mark an interface down and notify protocols of
1229  * the transition.
1230  * NOTE: must be called at splnet or eqivalent.
1231  */
1232 void
1233 if_unroute(struct ifnet *ifp, int flag, int fam)
1234 {
1235         struct ifaddr_container *ifac;
1236
1237         ifp->if_flags &= ~flag;
1238         getmicrotime(&ifp->if_lastchange);
1239         TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
1240                 struct ifaddr *ifa = ifac->ifa;
1241
1242                 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
1243                         kpfctlinput(PRC_IFDOWN, ifa->ifa_addr);
1244         }
1245         ifq_purge(&ifp->if_snd);
1246         rt_ifmsg(ifp);
1247 }
1248
1249 /*
1250  * Mark an interface up and notify protocols of
1251  * the transition.
1252  * NOTE: must be called at splnet or eqivalent.
1253  */
1254 void
1255 if_route(struct ifnet *ifp, int flag, int fam)
1256 {
1257         struct ifaddr_container *ifac;
1258
1259         ifq_purge(&ifp->if_snd);
1260         ifp->if_flags |= flag;
1261         getmicrotime(&ifp->if_lastchange);
1262         TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
1263                 struct ifaddr *ifa = ifac->ifa;
1264
1265                 if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
1266                         kpfctlinput(PRC_IFUP, ifa->ifa_addr);
1267         }
1268         rt_ifmsg(ifp);
1269 #ifdef INET6
1270         in6_if_up(ifp);
1271 #endif
1272 }
1273
1274 /*
1275  * Mark an interface down and notify protocols of the transition.  An
1276  * interface going down is also considered to be a synchronizing event.
1277  * We must ensure that all packet processing related to the interface
1278  * has completed before we return so e.g. the caller can free the ifnet
1279  * structure that the mbufs may be referencing.
1280  *
1281  * NOTE: must be called at splnet or eqivalent.
1282  */
1283 void
1284 if_down(struct ifnet *ifp)
1285 {
1286         if_unroute(ifp, IFF_UP, AF_UNSPEC);
1287         netmsg_service_sync();
1288 }
1289
1290 /*
1291  * Mark an interface up and notify protocols of
1292  * the transition.
1293  * NOTE: must be called at splnet or eqivalent.
1294  */
1295 void
1296 if_up(struct ifnet *ifp)
1297 {
1298         if_route(ifp, IFF_UP, AF_UNSPEC);
1299 }
1300
1301 /*
1302  * Process a link state change.
1303  * NOTE: must be called at splsoftnet or equivalent.
1304  */
1305 void
1306 if_link_state_change(struct ifnet *ifp)
1307 {
1308         int link_state = ifp->if_link_state;
1309
1310         rt_ifmsg(ifp);
1311         devctl_notify("IFNET", ifp->if_xname,
1312             (link_state == LINK_STATE_UP) ? "LINK_UP" : "LINK_DOWN", NULL);
1313 }
1314
1315 /*
1316  * Handle interface watchdog timer routines.  Called
1317  * from softclock, we decrement timers (if set) and
1318  * call the appropriate interface routine on expiration.
1319  */
1320 static void
1321 if_slowtimo(void *arg)
1322 {
1323         struct ifnet *ifp;
1324
1325         crit_enter();
1326
1327         TAILQ_FOREACH(ifp, &ifnet, if_link) {
1328                 if (ifp->if_timer == 0 || --ifp->if_timer)
1329                         continue;
1330                 if (ifp->if_watchdog) {
1331                         if (ifnet_tryserialize_all(ifp)) {
1332                                 (*ifp->if_watchdog)(ifp);
1333                                 ifnet_deserialize_all(ifp);
1334                         } else {
1335                                 /* try again next timeout */
1336                                 ++ifp->if_timer;
1337                         }
1338                 }
1339         }
1340
1341         crit_exit();
1342
1343         callout_reset(&if_slowtimo_timer, hz / IFNET_SLOWHZ, if_slowtimo, NULL);
1344 }
1345
1346 /*
1347  * Map interface name to
1348  * interface structure pointer.
1349  */
1350 struct ifnet *
1351 ifunit(const char *name)
1352 {
1353         struct ifnet *ifp;
1354
1355         /*
1356          * Search all the interfaces for this name/number
1357          */
1358
1359         TAILQ_FOREACH(ifp, &ifnet, if_link) {
1360                 if (strncmp(ifp->if_xname, name, IFNAMSIZ) == 0)
1361                         break;
1362         }
1363         return (ifp);
1364 }
1365
1366
1367 /*
1368  * Map interface name in a sockaddr_dl to
1369  * interface structure pointer.
1370  */
1371 struct ifnet *
1372 if_withname(struct sockaddr *sa)
1373 {
1374         char ifname[IFNAMSIZ+1];
1375         struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa;
1376
1377         if ( (sa->sa_family != AF_LINK) || (sdl->sdl_nlen == 0) ||
1378              (sdl->sdl_nlen > IFNAMSIZ) )
1379                 return NULL;
1380
1381         /*
1382          * ifunit wants a null-terminated name.  It may not be null-terminated
1383          * in the sockaddr.  We don't want to change the caller's sockaddr,
1384          * and there might not be room to put the trailing null anyway, so we
1385          * make a local copy that we know we can null terminate safely.
1386          */
1387
1388         bcopy(sdl->sdl_data, ifname, sdl->sdl_nlen);
1389         ifname[sdl->sdl_nlen] = '\0';
1390         return ifunit(ifname);
1391 }
1392
1393
1394 /*
1395  * Interface ioctls.
1396  */
1397 int
1398 ifioctl(struct socket *so, u_long cmd, caddr_t data, struct ucred *cred)
1399 {
1400         struct ifnet *ifp;
1401         struct ifreq *ifr;
1402         struct ifstat *ifs;
1403         int error;
1404         short oif_flags;
1405         int new_flags;
1406 #ifdef COMPAT_43
1407         int ocmd;
1408 #endif
1409         size_t namelen, onamelen;
1410         char new_name[IFNAMSIZ];
1411         struct ifaddr *ifa;
1412         struct sockaddr_dl *sdl;
1413
1414         switch (cmd) {
1415         case SIOCGIFCONF:
1416         case OSIOCGIFCONF:
1417                 return (ifconf(cmd, data, cred));
1418         default:
1419                 break;
1420         }
1421
1422         ifr = (struct ifreq *)data;
1423
1424         switch (cmd) {
1425         case SIOCIFCREATE:
1426         case SIOCIFCREATE2:
1427                 if ((error = priv_check_cred(cred, PRIV_ROOT, 0)) != 0)
1428                         return (error);
1429                 return (if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name),
1430                         cmd == SIOCIFCREATE2 ? ifr->ifr_data : NULL));
1431         case SIOCIFDESTROY:
1432                 if ((error = priv_check_cred(cred, PRIV_ROOT, 0)) != 0)
1433                         return (error);
1434                 return (if_clone_destroy(ifr->ifr_name));
1435         case SIOCIFGCLONERS:
1436                 return (if_clone_list((struct if_clonereq *)data));
1437         default:
1438                 break;
1439         }
1440
1441         /*
1442          * Nominal ioctl through interface, lookup the ifp and obtain a
1443          * lock to serialize the ifconfig ioctl operation.
1444          */
1445         ifp = ifunit(ifr->ifr_name);
1446         if (ifp == NULL)
1447                 return (ENXIO);
1448         error = 0;
1449         mtx_lock(&ifp->if_ioctl_mtx);
1450
1451         switch (cmd) {
1452         case SIOCGIFINDEX:
1453                 ifr->ifr_index = ifp->if_index;
1454                 break;
1455
1456         case SIOCGIFFLAGS:
1457                 ifr->ifr_flags = ifp->if_flags;
1458                 ifr->ifr_flagshigh = ifp->if_flags >> 16;
1459                 break;
1460
1461         case SIOCGIFCAP:
1462                 ifr->ifr_reqcap = ifp->if_capabilities;
1463                 ifr->ifr_curcap = ifp->if_capenable;
1464                 break;
1465
1466         case SIOCGIFMETRIC:
1467                 ifr->ifr_metric = ifp->if_metric;
1468                 break;
1469
1470         case SIOCGIFMTU:
1471                 ifr->ifr_mtu = ifp->if_mtu;
1472                 break;
1473
1474         case SIOCGIFDATA:
1475                 error = copyout((caddr_t)&ifp->if_data, ifr->ifr_data,
1476                                 sizeof(ifp->if_data));
1477                 break;
1478
1479         case SIOCGIFPHYS:
1480                 ifr->ifr_phys = ifp->if_physical;
1481                 break;
1482
1483         case SIOCGIFPOLLCPU:
1484                 ifr->ifr_pollcpu = -1;
1485                 break;
1486
1487         case SIOCSIFPOLLCPU:
1488                 break;
1489
1490         case SIOCSIFFLAGS:
1491                 error = priv_check_cred(cred, PRIV_ROOT, 0);
1492                 if (error)
1493                         break;
1494                 new_flags = (ifr->ifr_flags & 0xffff) |
1495                     (ifr->ifr_flagshigh << 16);
1496                 if (ifp->if_flags & IFF_SMART) {
1497                         /* Smart drivers twiddle their own routes */
1498                 } else if (ifp->if_flags & IFF_UP &&
1499                     (new_flags & IFF_UP) == 0) {
1500                         crit_enter();
1501                         if_down(ifp);
1502                         crit_exit();
1503                 } else if (new_flags & IFF_UP &&
1504                     (ifp->if_flags & IFF_UP) == 0) {
1505                         crit_enter();
1506                         if_up(ifp);
1507                         crit_exit();
1508                 }
1509
1510 #ifdef IFPOLL_ENABLE
1511                 if ((new_flags ^ ifp->if_flags) & IFF_NPOLLING) {
1512                         if (new_flags & IFF_NPOLLING)
1513                                 ifpoll_register(ifp);
1514                         else
1515                                 ifpoll_deregister(ifp);
1516                 }
1517 #endif
1518
1519                 ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) |
1520                         (new_flags &~ IFF_CANTCHANGE);
1521                 if (new_flags & IFF_PPROMISC) {
1522                         /* Permanently promiscuous mode requested */
1523                         ifp->if_flags |= IFF_PROMISC;
1524                 } else if (ifp->if_pcount == 0) {
1525                         ifp->if_flags &= ~IFF_PROMISC;
1526                 }
1527                 if (ifp->if_ioctl) {
1528                         ifnet_serialize_all(ifp);
1529                         ifp->if_ioctl(ifp, cmd, data, cred);
1530                         ifnet_deserialize_all(ifp);
1531                 }
1532                 getmicrotime(&ifp->if_lastchange);
1533                 break;
1534
1535         case SIOCSIFCAP:
1536                 error = priv_check_cred(cred, PRIV_ROOT, 0);
1537                 if (error)
1538                         break;
1539                 if (ifr->ifr_reqcap & ~ifp->if_capabilities) {
1540                         error = EINVAL;
1541                         break;
1542                 }
1543                 ifnet_serialize_all(ifp);
1544                 ifp->if_ioctl(ifp, cmd, data, cred);
1545                 ifnet_deserialize_all(ifp);
1546                 break;
1547
1548         case SIOCSIFNAME:
1549                 error = priv_check_cred(cred, PRIV_ROOT, 0);
1550                 if (error)
1551                         break;
1552                 error = copyinstr(ifr->ifr_data, new_name, IFNAMSIZ, NULL);
1553                 if (error)
1554                         break;
1555                 if (new_name[0] == '\0') {
1556                         error = EINVAL;
1557                         break;
1558                 }
1559                 if (ifunit(new_name) != NULL) {
1560                         error = EEXIST;
1561                         break;
1562                 }
1563
1564                 EVENTHANDLER_INVOKE(ifnet_detach_event, ifp);
1565
1566                 /* Announce the departure of the interface. */
1567                 rt_ifannouncemsg(ifp, IFAN_DEPARTURE);
1568
1569                 strlcpy(ifp->if_xname, new_name, sizeof(ifp->if_xname));
1570                 ifa = TAILQ_FIRST(&ifp->if_addrheads[mycpuid])->ifa;
1571                 /* XXX IFA_LOCK(ifa); */
1572                 sdl = (struct sockaddr_dl *)ifa->ifa_addr;
1573                 namelen = strlen(new_name);
1574                 onamelen = sdl->sdl_nlen;
1575                 /*
1576                  * Move the address if needed.  This is safe because we
1577                  * allocate space for a name of length IFNAMSIZ when we
1578                  * create this in if_attach().
1579                  */
1580                 if (namelen != onamelen) {
1581                         bcopy(sdl->sdl_data + onamelen,
1582                             sdl->sdl_data + namelen, sdl->sdl_alen);
1583                 }
1584                 bcopy(new_name, sdl->sdl_data, namelen);
1585                 sdl->sdl_nlen = namelen;
1586                 sdl = (struct sockaddr_dl *)ifa->ifa_netmask;
1587                 bzero(sdl->sdl_data, onamelen);
1588                 while (namelen != 0)
1589                         sdl->sdl_data[--namelen] = 0xff;
1590                 /* XXX IFA_UNLOCK(ifa) */
1591
1592                 EVENTHANDLER_INVOKE(ifnet_attach_event, ifp);
1593
1594                 /* Announce the return of the interface. */
1595                 rt_ifannouncemsg(ifp, IFAN_ARRIVAL);
1596                 break;
1597
1598         case SIOCSIFMETRIC:
1599                 error = priv_check_cred(cred, PRIV_ROOT, 0);
1600                 if (error)
1601                         break;
1602                 ifp->if_metric = ifr->ifr_metric;
1603                 getmicrotime(&ifp->if_lastchange);
1604                 break;
1605
1606         case SIOCSIFPHYS:
1607                 error = priv_check_cred(cred, PRIV_ROOT, 0);
1608                 if (error)
1609                         break;
1610                 if (ifp->if_ioctl == NULL) {
1611                         error = EOPNOTSUPP;
1612                         break;
1613                 }
1614                 ifnet_serialize_all(ifp);
1615                 error = ifp->if_ioctl(ifp, cmd, data, cred);
1616                 ifnet_deserialize_all(ifp);
1617                 if (error == 0)
1618                         getmicrotime(&ifp->if_lastchange);
1619                 break;
1620
1621         case SIOCSIFMTU:
1622         {
1623                 u_long oldmtu = ifp->if_mtu;
1624
1625                 error = priv_check_cred(cred, PRIV_ROOT, 0);
1626                 if (error)
1627                         break;
1628                 if (ifp->if_ioctl == NULL) {
1629                         error = EOPNOTSUPP;
1630                         break;
1631                 }
1632                 if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU) {
1633                         error = EINVAL;
1634                         break;
1635                 }
1636                 ifnet_serialize_all(ifp);
1637                 error = ifp->if_ioctl(ifp, cmd, data, cred);
1638                 ifnet_deserialize_all(ifp);
1639                 if (error == 0) {
1640                         getmicrotime(&ifp->if_lastchange);
1641                         rt_ifmsg(ifp);
1642                 }
1643                 /*
1644                  * If the link MTU changed, do network layer specific procedure.
1645                  */
1646                 if (ifp->if_mtu != oldmtu) {
1647 #ifdef INET6
1648                         nd6_setmtu(ifp);
1649 #endif
1650                 }
1651                 break;
1652         }
1653
1654         case SIOCADDMULTI:
1655         case SIOCDELMULTI:
1656                 error = priv_check_cred(cred, PRIV_ROOT, 0);
1657                 if (error)
1658                         break;
1659
1660                 /* Don't allow group membership on non-multicast interfaces. */
1661                 if ((ifp->if_flags & IFF_MULTICAST) == 0) {
1662                         error = EOPNOTSUPP;
1663                         break;
1664                 }
1665
1666                 /* Don't let users screw up protocols' entries. */
1667                 if (ifr->ifr_addr.sa_family != AF_LINK) {
1668                         error = EINVAL;
1669                         break;
1670                 }
1671
1672                 if (cmd == SIOCADDMULTI) {
1673                         struct ifmultiaddr *ifma;
1674                         error = if_addmulti(ifp, &ifr->ifr_addr, &ifma);
1675                 } else {
1676                         error = if_delmulti(ifp, &ifr->ifr_addr);
1677                 }
1678                 if (error == 0)
1679                         getmicrotime(&ifp->if_lastchange);
1680                 break;
1681
1682         case SIOCSIFPHYADDR:
1683         case SIOCDIFPHYADDR:
1684 #ifdef INET6
1685         case SIOCSIFPHYADDR_IN6:
1686 #endif
1687         case SIOCSLIFPHYADDR:
1688         case SIOCSIFMEDIA:
1689         case SIOCSIFGENERIC:
1690                 error = priv_check_cred(cred, PRIV_ROOT, 0);
1691                 if (error)
1692                         break;
1693                 if (ifp->if_ioctl == 0) {
1694                         error = EOPNOTSUPP;
1695                         break;
1696                 }
1697                 ifnet_serialize_all(ifp);
1698                 error = ifp->if_ioctl(ifp, cmd, data, cred);
1699                 ifnet_deserialize_all(ifp);
1700                 if (error == 0)
1701                         getmicrotime(&ifp->if_lastchange);
1702                 break;
1703
1704         case SIOCGIFSTATUS:
1705                 ifs = (struct ifstat *)data;
1706                 ifs->ascii[0] = '\0';
1707                 /* fall through */
1708         case SIOCGIFPSRCADDR:
1709         case SIOCGIFPDSTADDR:
1710         case SIOCGLIFPHYADDR:
1711         case SIOCGIFMEDIA:
1712         case SIOCGIFGENERIC:
1713                 if (ifp->if_ioctl == NULL) {
1714                         error = EOPNOTSUPP;
1715                         break;
1716                 }
1717                 ifnet_serialize_all(ifp);
1718                 error = ifp->if_ioctl(ifp, cmd, data, cred);
1719                 ifnet_deserialize_all(ifp);
1720                 break;
1721
1722         case SIOCSIFLLADDR:
1723                 error = priv_check_cred(cred, PRIV_ROOT, 0);
1724                 if (error)
1725                         break;
1726                 error = if_setlladdr(ifp, ifr->ifr_addr.sa_data,
1727                                      ifr->ifr_addr.sa_len);
1728                 EVENTHANDLER_INVOKE(iflladdr_event, ifp);
1729                 break;
1730
1731         default:
1732                 oif_flags = ifp->if_flags;
1733                 if (so->so_proto == 0) {
1734                         error = EOPNOTSUPP;
1735                         break;
1736                 }
1737 #ifndef COMPAT_43
1738                 error = so_pru_control_direct(so, cmd, data, ifp);
1739 #else
1740                 ocmd = cmd;
1741
1742                 switch (cmd) {
1743                 case SIOCSIFDSTADDR:
1744                 case SIOCSIFADDR:
1745                 case SIOCSIFBRDADDR:
1746                 case SIOCSIFNETMASK:
1747 #if BYTE_ORDER != BIG_ENDIAN
1748                         if (ifr->ifr_addr.sa_family == 0 &&
1749                             ifr->ifr_addr.sa_len < 16) {
1750                                 ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len;
1751                                 ifr->ifr_addr.sa_len = 16;
1752                         }
1753 #else
1754                         if (ifr->ifr_addr.sa_len == 0)
1755                                 ifr->ifr_addr.sa_len = 16;
1756 #endif
1757                         break;
1758                 case OSIOCGIFADDR:
1759                         cmd = SIOCGIFADDR;
1760                         break;
1761                 case OSIOCGIFDSTADDR:
1762                         cmd = SIOCGIFDSTADDR;
1763                         break;
1764                 case OSIOCGIFBRDADDR:
1765                         cmd = SIOCGIFBRDADDR;
1766                         break;
1767                 case OSIOCGIFNETMASK:
1768                         cmd = SIOCGIFNETMASK;
1769                         break;
1770                 default:
1771                         break;
1772                 }
1773
1774                 error = so_pru_control_direct(so, cmd, data, ifp);
1775
1776                 switch (ocmd) {
1777                 case OSIOCGIFADDR:
1778                 case OSIOCGIFDSTADDR:
1779                 case OSIOCGIFBRDADDR:
1780                 case OSIOCGIFNETMASK:
1781                         *(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family;
1782                         break;
1783                 }
1784 #endif /* COMPAT_43 */
1785
1786                 if ((oif_flags ^ ifp->if_flags) & IFF_UP) {
1787 #ifdef INET6
1788                         DELAY(100);/* XXX: temporary workaround for fxp issue*/
1789                         if (ifp->if_flags & IFF_UP) {
1790                                 crit_enter();
1791                                 in6_if_up(ifp);
1792                                 crit_exit();
1793                         }
1794 #endif
1795                 }
1796                 break;
1797         }
1798
1799         mtx_unlock(&ifp->if_ioctl_mtx);
1800         return (error);
1801 }
1802
1803 /*
1804  * Set/clear promiscuous mode on interface ifp based on the truth value
1805  * of pswitch.  The calls are reference counted so that only the first
1806  * "on" request actually has an effect, as does the final "off" request.
1807  * Results are undefined if the "off" and "on" requests are not matched.
1808  */
1809 int
1810 ifpromisc(struct ifnet *ifp, int pswitch)
1811 {
1812         struct ifreq ifr;
1813         int error;
1814         int oldflags;
1815
1816         oldflags = ifp->if_flags;
1817         if (ifp->if_flags & IFF_PPROMISC) {
1818                 /* Do nothing if device is in permanently promiscuous mode */
1819                 ifp->if_pcount += pswitch ? 1 : -1;
1820                 return (0);
1821         }
1822         if (pswitch) {
1823                 /*
1824                  * If the device is not configured up, we cannot put it in
1825                  * promiscuous mode.
1826                  */
1827                 if ((ifp->if_flags & IFF_UP) == 0)
1828                         return (ENETDOWN);
1829                 if (ifp->if_pcount++ != 0)
1830                         return (0);
1831                 ifp->if_flags |= IFF_PROMISC;
1832                 log(LOG_INFO, "%s: promiscuous mode enabled\n",
1833                     ifp->if_xname);
1834         } else {
1835                 if (--ifp->if_pcount > 0)
1836                         return (0);
1837                 ifp->if_flags &= ~IFF_PROMISC;
1838                 log(LOG_INFO, "%s: promiscuous mode disabled\n",
1839                     ifp->if_xname);
1840         }
1841         ifr.ifr_flags = ifp->if_flags;
1842         ifr.ifr_flagshigh = ifp->if_flags >> 16;
1843         ifnet_serialize_all(ifp);
1844         error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr, NULL);
1845         ifnet_deserialize_all(ifp);
1846         if (error == 0)
1847                 rt_ifmsg(ifp);
1848         else
1849                 ifp->if_flags = oldflags;
1850         return error;
1851 }
1852
1853 /*
1854  * Return interface configuration
1855  * of system.  List may be used
1856  * in later ioctl's (above) to get
1857  * other information.
1858  */
1859 static int
1860 ifconf(u_long cmd, caddr_t data, struct ucred *cred)
1861 {
1862         struct ifconf *ifc = (struct ifconf *)data;
1863         struct ifnet *ifp;
1864         struct sockaddr *sa;
1865         struct ifreq ifr, *ifrp;
1866         int space = ifc->ifc_len, error = 0;
1867
1868         ifrp = ifc->ifc_req;
1869         TAILQ_FOREACH(ifp, &ifnet, if_link) {
1870                 struct ifaddr_container *ifac;
1871                 int addrs;
1872
1873                 if (space <= sizeof ifr)
1874                         break;
1875
1876                 /*
1877                  * Zero the stack declared structure first to prevent
1878                  * memory disclosure.
1879                  */
1880                 bzero(&ifr, sizeof(ifr));
1881                 if (strlcpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name))
1882                     >= sizeof(ifr.ifr_name)) {
1883                         error = ENAMETOOLONG;
1884                         break;
1885                 }
1886
1887                 addrs = 0;
1888                 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
1889                         struct ifaddr *ifa = ifac->ifa;
1890
1891                         if (space <= sizeof ifr)
1892                                 break;
1893                         sa = ifa->ifa_addr;
1894                         if (cred->cr_prison &&
1895                             prison_if(cred, sa))
1896                                 continue;
1897                         addrs++;
1898 #ifdef COMPAT_43
1899                         if (cmd == OSIOCGIFCONF) {
1900                                 struct osockaddr *osa =
1901                                          (struct osockaddr *)&ifr.ifr_addr;
1902                                 ifr.ifr_addr = *sa;
1903                                 osa->sa_family = sa->sa_family;
1904                                 error = copyout(&ifr, ifrp, sizeof ifr);
1905                                 ifrp++;
1906                         } else
1907 #endif
1908                         if (sa->sa_len <= sizeof(*sa)) {
1909                                 ifr.ifr_addr = *sa;
1910                                 error = copyout(&ifr, ifrp, sizeof ifr);
1911                                 ifrp++;
1912                         } else {
1913                                 if (space < (sizeof ifr) + sa->sa_len -
1914                                             sizeof(*sa))
1915                                         break;
1916                                 space -= sa->sa_len - sizeof(*sa);
1917                                 error = copyout(&ifr, ifrp,
1918                                                 sizeof ifr.ifr_name);
1919                                 if (error == 0)
1920                                         error = copyout(sa, &ifrp->ifr_addr,
1921                                                         sa->sa_len);
1922                                 ifrp = (struct ifreq *)
1923                                         (sa->sa_len + (caddr_t)&ifrp->ifr_addr);
1924                         }
1925                         if (error)
1926                                 break;
1927                         space -= sizeof ifr;
1928                 }
1929                 if (error)
1930                         break;
1931                 if (!addrs) {
1932                         bzero(&ifr.ifr_addr, sizeof ifr.ifr_addr);
1933                         error = copyout(&ifr, ifrp, sizeof ifr);
1934                         if (error)
1935                                 break;
1936                         space -= sizeof ifr;
1937                         ifrp++;
1938                 }
1939         }
1940         ifc->ifc_len -= space;
1941         return (error);
1942 }
1943
1944 /*
1945  * Just like if_promisc(), but for all-multicast-reception mode.
1946  */
1947 int
1948 if_allmulti(struct ifnet *ifp, int onswitch)
1949 {
1950         int error = 0;
1951         struct ifreq ifr;
1952
1953         crit_enter();
1954
1955         if (onswitch) {
1956                 if (ifp->if_amcount++ == 0) {
1957                         ifp->if_flags |= IFF_ALLMULTI;
1958                         ifr.ifr_flags = ifp->if_flags;
1959                         ifr.ifr_flagshigh = ifp->if_flags >> 16;
1960                         ifnet_serialize_all(ifp);
1961                         error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1962                                               NULL);
1963                         ifnet_deserialize_all(ifp);
1964                 }
1965         } else {
1966                 if (ifp->if_amcount > 1) {
1967                         ifp->if_amcount--;
1968                 } else {
1969                         ifp->if_amcount = 0;
1970                         ifp->if_flags &= ~IFF_ALLMULTI;
1971                         ifr.ifr_flags = ifp->if_flags;
1972                         ifr.ifr_flagshigh = ifp->if_flags >> 16;
1973                         ifnet_serialize_all(ifp);
1974                         error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
1975                                               NULL);
1976                         ifnet_deserialize_all(ifp);
1977                 }
1978         }
1979
1980         crit_exit();
1981
1982         if (error == 0)
1983                 rt_ifmsg(ifp);
1984         return error;
1985 }
1986
1987 /*
1988  * Add a multicast listenership to the interface in question.
1989  * The link layer provides a routine which converts
1990  */
1991 int
1992 if_addmulti(
1993         struct ifnet *ifp,      /* interface to manipulate */
1994         struct sockaddr *sa,    /* address to add */
1995         struct ifmultiaddr **retifma)
1996 {
1997         struct sockaddr *llsa, *dupsa;
1998         int error;
1999         struct ifmultiaddr *ifma;
2000
2001         /*
2002          * If the matching multicast address already exists
2003          * then don't add a new one, just add a reference
2004          */
2005         TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
2006                 if (sa_equal(sa, ifma->ifma_addr)) {
2007                         ifma->ifma_refcount++;
2008                         if (retifma)
2009                                 *retifma = ifma;
2010                         return 0;
2011                 }
2012         }
2013
2014         /*
2015          * Give the link layer a chance to accept/reject it, and also
2016          * find out which AF_LINK address this maps to, if it isn't one
2017          * already.
2018          */
2019         if (ifp->if_resolvemulti) {
2020                 ifnet_serialize_all(ifp);
2021                 error = ifp->if_resolvemulti(ifp, &llsa, sa);
2022                 ifnet_deserialize_all(ifp);
2023                 if (error)
2024                         return error;
2025         } else {
2026                 llsa = NULL;
2027         }
2028
2029         ifma = kmalloc(sizeof *ifma, M_IFMADDR, M_WAITOK);
2030         dupsa = kmalloc(sa->sa_len, M_IFMADDR, M_WAITOK);
2031         bcopy(sa, dupsa, sa->sa_len);
2032
2033         ifma->ifma_addr = dupsa;
2034         ifma->ifma_lladdr = llsa;
2035         ifma->ifma_ifp = ifp;
2036         ifma->ifma_refcount = 1;
2037         ifma->ifma_protospec = 0;
2038         rt_newmaddrmsg(RTM_NEWMADDR, ifma);
2039
2040         /*
2041          * Some network interfaces can scan the address list at
2042          * interrupt time; lock them out.
2043          */
2044         crit_enter();
2045         TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
2046         crit_exit();
2047         if (retifma)
2048                 *retifma = ifma;
2049
2050         if (llsa != NULL) {
2051                 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
2052                         if (sa_equal(ifma->ifma_addr, llsa))
2053                                 break;
2054                 }
2055                 if (ifma) {
2056                         ifma->ifma_refcount++;
2057                 } else {
2058                         ifma = kmalloc(sizeof *ifma, M_IFMADDR, M_WAITOK);
2059                         dupsa = kmalloc(llsa->sa_len, M_IFMADDR, M_WAITOK);
2060                         bcopy(llsa, dupsa, llsa->sa_len);
2061                         ifma->ifma_addr = dupsa;
2062                         ifma->ifma_ifp = ifp;
2063                         ifma->ifma_refcount = 1;
2064                         crit_enter();
2065                         TAILQ_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
2066                         crit_exit();
2067                 }
2068         }
2069         /*
2070          * We are certain we have added something, so call down to the
2071          * interface to let them know about it.
2072          */
2073         crit_enter();
2074         ifnet_serialize_all(ifp);
2075         if (ifp->if_ioctl)
2076                 ifp->if_ioctl(ifp, SIOCADDMULTI, 0, NULL);
2077         ifnet_deserialize_all(ifp);
2078         crit_exit();
2079
2080         return 0;
2081 }
2082
2083 /*
2084  * Remove a reference to a multicast address on this interface.  Yell
2085  * if the request does not match an existing membership.
2086  */
2087 int
2088 if_delmulti(struct ifnet *ifp, struct sockaddr *sa)
2089 {
2090         struct ifmultiaddr *ifma;
2091
2092         TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
2093                 if (sa_equal(sa, ifma->ifma_addr))
2094                         break;
2095         if (ifma == NULL)
2096                 return ENOENT;
2097
2098         if (ifma->ifma_refcount > 1) {
2099                 ifma->ifma_refcount--;
2100                 return 0;
2101         }
2102
2103         rt_newmaddrmsg(RTM_DELMADDR, ifma);
2104         sa = ifma->ifma_lladdr;
2105         crit_enter();
2106         TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link);
2107         /*
2108          * Make sure the interface driver is notified
2109          * in the case of a link layer mcast group being left.
2110          */
2111         if (ifma->ifma_addr->sa_family == AF_LINK && sa == NULL) {
2112                 ifnet_serialize_all(ifp);
2113                 ifp->if_ioctl(ifp, SIOCDELMULTI, 0, NULL);
2114                 ifnet_deserialize_all(ifp);
2115         }
2116         crit_exit();
2117         kfree(ifma->ifma_addr, M_IFMADDR);
2118         kfree(ifma, M_IFMADDR);
2119         if (sa == NULL)
2120                 return 0;
2121
2122         /*
2123          * Now look for the link-layer address which corresponds to
2124          * this network address.  It had been squirreled away in
2125          * ifma->ifma_lladdr for this purpose (so we don't have
2126          * to call ifp->if_resolvemulti() again), and we saved that
2127          * value in sa above.  If some nasty deleted the
2128          * link-layer address out from underneath us, we can deal because
2129          * the address we stored was is not the same as the one which was
2130          * in the record for the link-layer address.  (So we don't complain
2131          * in that case.)
2132          */
2133         TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
2134                 if (sa_equal(sa, ifma->ifma_addr))
2135                         break;
2136         if (ifma == NULL)
2137                 return 0;
2138
2139         if (ifma->ifma_refcount > 1) {
2140                 ifma->ifma_refcount--;
2141                 return 0;
2142         }
2143
2144         crit_enter();
2145         ifnet_serialize_all(ifp);
2146         TAILQ_REMOVE(&ifp->if_multiaddrs, ifma, ifma_link);
2147         ifp->if_ioctl(ifp, SIOCDELMULTI, 0, NULL);
2148         ifnet_deserialize_all(ifp);
2149         crit_exit();
2150         kfree(ifma->ifma_addr, M_IFMADDR);
2151         kfree(sa, M_IFMADDR);
2152         kfree(ifma, M_IFMADDR);
2153
2154         return 0;
2155 }
2156
2157 /*
2158  * Delete all multicast group membership for an interface.
2159  * Should be used to quickly flush all multicast filters.
2160  */
2161 void
2162 if_delallmulti(struct ifnet *ifp)
2163 {
2164         struct ifmultiaddr *ifma;
2165         struct ifmultiaddr *next;
2166
2167         TAILQ_FOREACH_MUTABLE(ifma, &ifp->if_multiaddrs, ifma_link, next)
2168                 if_delmulti(ifp, ifma->ifma_addr);
2169 }
2170
2171
2172 /*
2173  * Set the link layer address on an interface.
2174  *
2175  * At this time we only support certain types of interfaces,
2176  * and we don't allow the length of the address to change.
2177  */
2178 int
2179 if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len)
2180 {
2181         struct sockaddr_dl *sdl;
2182         struct ifreq ifr;
2183
2184         sdl = IF_LLSOCKADDR(ifp);
2185         if (sdl == NULL)
2186                 return (EINVAL);
2187         if (len != sdl->sdl_alen)       /* don't allow length to change */
2188                 return (EINVAL);
2189         switch (ifp->if_type) {
2190         case IFT_ETHER:                 /* these types use struct arpcom */
2191         case IFT_XETHER:
2192         case IFT_L2VLAN:
2193                 bcopy(lladdr, ((struct arpcom *)ifp->if_softc)->ac_enaddr, len);
2194                 bcopy(lladdr, LLADDR(sdl), len);
2195                 break;
2196         default:
2197                 return (ENODEV);
2198         }
2199         /*
2200          * If the interface is already up, we need
2201          * to re-init it in order to reprogram its
2202          * address filter.
2203          */
2204         ifnet_serialize_all(ifp);
2205         if ((ifp->if_flags & IFF_UP) != 0) {
2206 #ifdef INET
2207                 struct ifaddr_container *ifac;
2208 #endif
2209
2210                 ifp->if_flags &= ~IFF_UP;
2211                 ifr.ifr_flags = ifp->if_flags;
2212                 ifr.ifr_flagshigh = ifp->if_flags >> 16;
2213                 ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
2214                               NULL);
2215                 ifp->if_flags |= IFF_UP;
2216                 ifr.ifr_flags = ifp->if_flags;
2217                 ifr.ifr_flagshigh = ifp->if_flags >> 16;
2218                 ifp->if_ioctl(ifp, SIOCSIFFLAGS, (caddr_t)&ifr,
2219                                  NULL);
2220 #ifdef INET
2221                 /*
2222                  * Also send gratuitous ARPs to notify other nodes about
2223                  * the address change.
2224                  */
2225                 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
2226                         struct ifaddr *ifa = ifac->ifa;
2227
2228                         if (ifa->ifa_addr != NULL &&
2229                             ifa->ifa_addr->sa_family == AF_INET)
2230                                 arp_gratuitous(ifp, ifa);
2231                 }
2232 #endif
2233         }
2234         ifnet_deserialize_all(ifp);
2235         return (0);
2236 }
2237
2238 struct ifmultiaddr *
2239 ifmaof_ifpforaddr(struct sockaddr *sa, struct ifnet *ifp)
2240 {
2241         struct ifmultiaddr *ifma;
2242
2243         TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link)
2244                 if (sa_equal(ifma->ifma_addr, sa))
2245                         break;
2246
2247         return ifma;
2248 }
2249
2250 /*
2251  * This function locates the first real ethernet MAC from a network
2252  * card and loads it into node, returning 0 on success or ENOENT if
2253  * no suitable interfaces were found.  It is used by the uuid code to
2254  * generate a unique 6-byte number.
2255  */
2256 int
2257 if_getanyethermac(uint16_t *node, int minlen)
2258 {
2259         struct ifnet *ifp;
2260         struct sockaddr_dl *sdl;
2261
2262         TAILQ_FOREACH(ifp, &ifnet, if_link) {
2263                 if (ifp->if_type != IFT_ETHER)
2264                         continue;
2265                 sdl = IF_LLSOCKADDR(ifp);
2266                 if (sdl->sdl_alen < minlen)
2267                         continue;
2268                 bcopy(((struct arpcom *)ifp->if_softc)->ac_enaddr, node,
2269                       minlen);
2270                 return(0);
2271         }
2272         return (ENOENT);
2273 }
2274
2275 /*
2276  * The name argument must be a pointer to storage which will last as
2277  * long as the interface does.  For physical devices, the result of
2278  * device_get_name(dev) is a good choice and for pseudo-devices a
2279  * static string works well.
2280  */
2281 void
2282 if_initname(struct ifnet *ifp, const char *name, int unit)
2283 {
2284         ifp->if_dname = name;
2285         ifp->if_dunit = unit;
2286         if (unit != IF_DUNIT_NONE)
2287                 ksnprintf(ifp->if_xname, IFNAMSIZ, "%s%d", name, unit);
2288         else
2289                 strlcpy(ifp->if_xname, name, IFNAMSIZ);
2290 }
2291
2292 int
2293 if_printf(struct ifnet *ifp, const char *fmt, ...)
2294 {
2295         __va_list ap;
2296         int retval;
2297
2298         retval = kprintf("%s: ", ifp->if_xname);
2299         __va_start(ap, fmt);
2300         retval += kvprintf(fmt, ap);
2301         __va_end(ap);
2302         return (retval);
2303 }
2304
2305 struct ifnet *
2306 if_alloc(uint8_t type)
2307 {
2308         struct ifnet *ifp;
2309         size_t size;
2310
2311         /*
2312          * XXX temporary hack until arpcom is setup in if_l2com
2313          */
2314         if (type == IFT_ETHER)
2315                 size = sizeof(struct arpcom);
2316         else
2317                 size = sizeof(struct ifnet);
2318
2319         ifp = kmalloc(size, M_IFNET, M_WAITOK|M_ZERO);
2320
2321         ifp->if_type = type;
2322
2323         if (if_com_alloc[type] != NULL) {
2324                 ifp->if_l2com = if_com_alloc[type](type, ifp);
2325                 if (ifp->if_l2com == NULL) {
2326                         kfree(ifp, M_IFNET);
2327                         return (NULL);
2328                 }
2329         }
2330         return (ifp);
2331 }
2332
2333 void
2334 if_free(struct ifnet *ifp)
2335 {
2336         kfree(ifp, M_IFNET);
2337 }
2338
2339 void
2340 ifq_set_classic(struct ifaltq *ifq)
2341 {
2342         ifq->altq_enqueue = ifq_classic_enqueue;
2343         ifq->altq_dequeue = ifq_classic_dequeue;
2344         ifq->altq_request = ifq_classic_request;
2345 }
2346
2347 int
2348 ifq_classic_enqueue(struct ifaltq *ifq, struct mbuf *m,
2349                     struct altq_pktattr *pa __unused)
2350 {
2351         logifq(enqueue, ifq);
2352         if (IF_QFULL(ifq)) {
2353                 m_freem(m);
2354                 return(ENOBUFS);
2355         } else {
2356                 IF_ENQUEUE(ifq, m);
2357                 return(0);
2358         }
2359 }
2360
2361 struct mbuf *
2362 ifq_classic_dequeue(struct ifaltq *ifq, struct mbuf *mpolled, int op)
2363 {
2364         struct mbuf *m;
2365
2366         switch (op) {
2367         case ALTDQ_POLL:
2368                 IF_POLL(ifq, m);
2369                 break;
2370         case ALTDQ_REMOVE:
2371                 logifq(dequeue, ifq);
2372                 IF_DEQUEUE(ifq, m);
2373                 break;
2374         default:
2375                 panic("unsupported ALTQ dequeue op: %d", op);
2376         }
2377         KKASSERT(mpolled == NULL || mpolled == m);
2378         return(m);
2379 }
2380
2381 int
2382 ifq_classic_request(struct ifaltq *ifq, int req, void *arg)
2383 {
2384         switch (req) {
2385         case ALTRQ_PURGE:
2386                 IF_DRAIN(ifq);
2387                 break;
2388         default:
2389                 panic("unsupported ALTQ request: %d", req);
2390         }
2391         return(0);
2392 }
2393
2394 int
2395 ifq_dispatch(struct ifnet *ifp, struct mbuf *m, struct altq_pktattr *pa)
2396 {
2397         struct ifaltq *ifq = &ifp->if_snd;
2398         int running = 0, error, start = 0;
2399
2400         ASSERT_IFNET_NOT_SERIALIZED_TX(ifp);
2401
2402         ALTQ_LOCK(ifq);
2403         error = ifq_enqueue_locked(ifq, m, pa);
2404         if (error) {
2405                 ALTQ_UNLOCK(ifq);
2406                 return error;
2407         }
2408         if (!ifq->altq_started) {
2409                 /*
2410                  * Hold the interlock of ifnet.if_start
2411                  */
2412                 ifq->altq_started = 1;
2413                 start = 1;
2414         }
2415         ALTQ_UNLOCK(ifq);
2416
2417         ifp->if_obytes += m->m_pkthdr.len;
2418         if (m->m_flags & M_MCAST)
2419                 ifp->if_omcasts++;
2420
2421         if (!start) {
2422                 logifstart(avoid, ifp);
2423                 return 0;
2424         }
2425
2426         /*
2427          * Try to do direct ifnet.if_start first, if there is
2428          * contention on ifnet's serializer, ifnet.if_start will
2429          * be scheduled on ifnet's CPU.
2430          */
2431         if (!ifnet_tryserialize_tx(ifp)) {
2432                 /*
2433                  * ifnet serializer contention happened,
2434                  * ifnet.if_start is scheduled on ifnet's
2435                  * CPU, and we keep going.
2436                  */
2437                 logifstart(contend_sched, ifp);
2438                 if_start_schedule(ifp);
2439                 return 0;
2440         }
2441
2442         if ((ifp->if_flags & IFF_OACTIVE) == 0) {
2443                 logifstart(run, ifp);
2444                 ifp->if_start(ifp);
2445                 if ((ifp->if_flags &
2446                      (IFF_OACTIVE | IFF_RUNNING)) == IFF_RUNNING)
2447                         running = 1;
2448         }
2449
2450         ifnet_deserialize_tx(ifp);
2451
2452         if (if_start_need_schedule(ifq, running)) {
2453                 /*
2454                  * More data need to be transmitted, ifnet.if_start is
2455                  * scheduled on ifnet's CPU, and we keep going.
2456                  * NOTE: ifnet.if_start interlock is not released.
2457                  */
2458                 logifstart(sched, ifp);
2459                 if_start_schedule(ifp);
2460         }
2461         return 0;
2462 }
2463
2464 void *
2465 ifa_create(int size, int flags)
2466 {
2467         struct ifaddr *ifa;
2468         int i;
2469
2470         KASSERT(size >= sizeof(*ifa), ("ifaddr size too small"));
2471
2472         ifa = kmalloc(size, M_IFADDR, flags | M_ZERO);
2473         if (ifa == NULL)
2474                 return NULL;
2475
2476         ifa->ifa_containers = kmalloc(ncpus * sizeof(struct ifaddr_container),
2477                                       M_IFADDR, M_WAITOK | M_ZERO);
2478         ifa->ifa_ncnt = ncpus;
2479         for (i = 0; i < ncpus; ++i) {
2480                 struct ifaddr_container *ifac = &ifa->ifa_containers[i];
2481
2482                 ifac->ifa_magic = IFA_CONTAINER_MAGIC;
2483                 ifac->ifa = ifa;
2484                 ifac->ifa_refcnt = 1;
2485         }
2486 #ifdef IFADDR_DEBUG
2487         kprintf("alloc ifa %p %d\n", ifa, size);
2488 #endif
2489         return ifa;
2490 }
2491
2492 void
2493 ifac_free(struct ifaddr_container *ifac, int cpu_id)
2494 {
2495         struct ifaddr *ifa = ifac->ifa;
2496
2497         KKASSERT(ifac->ifa_magic == IFA_CONTAINER_MAGIC);
2498         KKASSERT(ifac->ifa_refcnt == 0);
2499         KASSERT(ifac->ifa_listmask == 0,
2500                 ("ifa is still on %#x lists", ifac->ifa_listmask));
2501
2502         ifac->ifa_magic = IFA_CONTAINER_DEAD;
2503
2504 #ifdef IFADDR_DEBUG_VERBOSE
2505         kprintf("try free ifa %p cpu_id %d\n", ifac->ifa, cpu_id);
2506 #endif
2507
2508         KASSERT(ifa->ifa_ncnt > 0 && ifa->ifa_ncnt <= ncpus,
2509                 ("invalid # of ifac, %d", ifa->ifa_ncnt));
2510         if (atomic_fetchadd_int(&ifa->ifa_ncnt, -1) == 1) {
2511 #ifdef IFADDR_DEBUG
2512                 kprintf("free ifa %p\n", ifa);
2513 #endif
2514                 kfree(ifa->ifa_containers, M_IFADDR);
2515                 kfree(ifa, M_IFADDR);
2516         }
2517 }
2518
2519 static void
2520 ifa_iflink_dispatch(netmsg_t nmsg)
2521 {
2522         struct netmsg_ifaddr *msg = (struct netmsg_ifaddr *)nmsg;
2523         struct ifaddr *ifa = msg->ifa;
2524         struct ifnet *ifp = msg->ifp;
2525         int cpu = mycpuid;
2526         struct ifaddr_container *ifac;
2527
2528         crit_enter();
2529
2530         ifac = &ifa->ifa_containers[cpu];
2531         ASSERT_IFAC_VALID(ifac);
2532         KASSERT((ifac->ifa_listmask & IFA_LIST_IFADDRHEAD) == 0,
2533                 ("ifaddr is on if_addrheads"));
2534
2535         ifac->ifa_listmask |= IFA_LIST_IFADDRHEAD;
2536         if (msg->tail)
2537                 TAILQ_INSERT_TAIL(&ifp->if_addrheads[cpu], ifac, ifa_link);
2538         else
2539                 TAILQ_INSERT_HEAD(&ifp->if_addrheads[cpu], ifac, ifa_link);
2540
2541         crit_exit();
2542
2543         ifa_forwardmsg(&nmsg->lmsg, cpu + 1);
2544 }
2545
2546 void
2547 ifa_iflink(struct ifaddr *ifa, struct ifnet *ifp, int tail)
2548 {
2549         struct netmsg_ifaddr msg;
2550
2551         netmsg_init(&msg.base, NULL, &curthread->td_msgport,
2552                     0, ifa_iflink_dispatch);
2553         msg.ifa = ifa;
2554         msg.ifp = ifp;
2555         msg.tail = tail;
2556
2557         ifa_domsg(&msg.base.lmsg, 0);
2558 }
2559
2560 static void
2561 ifa_ifunlink_dispatch(netmsg_t nmsg)
2562 {
2563         struct netmsg_ifaddr *msg = (struct netmsg_ifaddr *)nmsg;
2564         struct ifaddr *ifa = msg->ifa;
2565         struct ifnet *ifp = msg->ifp;
2566         int cpu = mycpuid;
2567         struct ifaddr_container *ifac;
2568
2569         crit_enter();
2570
2571         ifac = &ifa->ifa_containers[cpu];
2572         ASSERT_IFAC_VALID(ifac);
2573         KASSERT(ifac->ifa_listmask & IFA_LIST_IFADDRHEAD,
2574                 ("ifaddr is not on if_addrhead"));
2575
2576         TAILQ_REMOVE(&ifp->if_addrheads[cpu], ifac, ifa_link);
2577         ifac->ifa_listmask &= ~IFA_LIST_IFADDRHEAD;
2578
2579         crit_exit();
2580
2581         ifa_forwardmsg(&nmsg->lmsg, cpu + 1);
2582 }
2583
2584 void
2585 ifa_ifunlink(struct ifaddr *ifa, struct ifnet *ifp)
2586 {
2587         struct netmsg_ifaddr msg;
2588
2589         netmsg_init(&msg.base, NULL, &curthread->td_msgport,
2590                     0, ifa_ifunlink_dispatch);
2591         msg.ifa = ifa;
2592         msg.ifp = ifp;
2593
2594         ifa_domsg(&msg.base.lmsg, 0);
2595 }
2596
2597 static void
2598 ifa_destroy_dispatch(netmsg_t nmsg)
2599 {
2600         struct netmsg_ifaddr *msg = (struct netmsg_ifaddr *)nmsg;
2601
2602         IFAFREE(msg->ifa);
2603         ifa_forwardmsg(&nmsg->lmsg, mycpuid + 1);
2604 }
2605
2606 void
2607 ifa_destroy(struct ifaddr *ifa)
2608 {
2609         struct netmsg_ifaddr msg;
2610
2611         netmsg_init(&msg.base, NULL, &curthread->td_msgport,
2612                     0, ifa_destroy_dispatch);
2613         msg.ifa = ifa;
2614
2615         ifa_domsg(&msg.base.lmsg, 0);
2616 }
2617
2618 struct lwkt_port *
2619 ifnet_portfn(int cpu)
2620 {
2621         return &ifnet_threads[cpu].td_msgport;
2622 }
2623
2624 void
2625 ifnet_forwardmsg(struct lwkt_msg *lmsg, int next_cpu)
2626 {
2627         KKASSERT(next_cpu > mycpuid && next_cpu <= ncpus);
2628
2629         if (next_cpu < ncpus)
2630                 lwkt_forwardmsg(ifnet_portfn(next_cpu), lmsg);
2631         else
2632                 lwkt_replymsg(lmsg, 0);
2633 }
2634
2635 int
2636 ifnet_domsg(struct lwkt_msg *lmsg, int cpu)
2637 {
2638         KKASSERT(cpu < ncpus);
2639         return lwkt_domsg(ifnet_portfn(cpu), lmsg, 0);
2640 }
2641
2642 void
2643 ifnet_sendmsg(struct lwkt_msg *lmsg, int cpu)
2644 {
2645         KKASSERT(cpu < ncpus);
2646         lwkt_sendmsg(ifnet_portfn(cpu), lmsg);
2647 }
2648
2649 /*
2650  * Generic netmsg service loop.  Some protocols may roll their own but all
2651  * must do the basic command dispatch function call done here.
2652  */
2653 static void
2654 ifnet_service_loop(void *arg __unused)
2655 {
2656         netmsg_t msg;
2657
2658         while ((msg = lwkt_waitport(&curthread->td_msgport, 0))) {
2659                 KASSERT(msg->base.nm_dispatch, ("ifnet_service: badmsg"));
2660                 msg->base.nm_dispatch(msg);
2661         }
2662 }
2663
2664 static void
2665 ifnetinit(void *dummy __unused)
2666 {
2667         int i;
2668
2669         for (i = 0; i < ncpus; ++i) {
2670                 struct thread *thr = &ifnet_threads[i];
2671
2672                 lwkt_create(ifnet_service_loop, NULL, NULL,
2673                             thr, TDF_NOSTART|TDF_FORCE_SPINPORT,
2674                             i, "ifnet %d", i);
2675                 netmsg_service_port_init(&thr->td_msgport);
2676                 lwkt_schedule(thr);
2677         }
2678 }
2679
2680 struct ifnet *
2681 ifnet_byindex(unsigned short idx)
2682 {
2683         if (idx > if_index)
2684                 return NULL;
2685         return ifindex2ifnet[idx];
2686 }
2687
2688 struct ifaddr *
2689 ifaddr_byindex(unsigned short idx)
2690 {
2691         struct ifnet *ifp;
2692
2693         ifp = ifnet_byindex(idx);
2694         if (!ifp)
2695                 return NULL;
2696         return TAILQ_FIRST(&ifp->if_addrheads[mycpuid])->ifa;
2697 }
2698
2699 void
2700 if_register_com_alloc(u_char type,
2701     if_com_alloc_t *a, if_com_free_t *f)
2702 {
2703
2704         KASSERT(if_com_alloc[type] == NULL,
2705             ("if_register_com_alloc: %d already registered", type));
2706         KASSERT(if_com_free[type] == NULL,
2707             ("if_register_com_alloc: %d free already registered", type));
2708
2709         if_com_alloc[type] = a;
2710         if_com_free[type] = f;
2711 }
2712
2713 void
2714 if_deregister_com_alloc(u_char type)
2715 {
2716
2717         KASSERT(if_com_alloc[type] != NULL,
2718             ("if_deregister_com_alloc: %d not registered", type));
2719         KASSERT(if_com_free[type] != NULL,
2720             ("if_deregister_com_alloc: %d free not registered", type));
2721         if_com_alloc[type] = NULL;
2722         if_com_free[type] = NULL;
2723 }
2724
2725 int
2726 if_ring_count2(int cnt, int cnt_max)
2727 {
2728         int shift = 0;
2729
2730         KASSERT(cnt_max >= 1 && powerof2(cnt_max),
2731             ("invalid ring count max %d", cnt_max));
2732
2733         if (cnt <= 0)
2734                 cnt = cnt_max;
2735         if (cnt > ncpus2)
2736                 cnt = ncpus2;
2737         if (cnt > cnt_max)
2738                 cnt = cnt_max;
2739
2740         while ((1 << (shift + 1)) <= cnt)
2741                 ++shift;
2742         cnt = 1 << shift;
2743
2744         KASSERT(cnt >= 1 && cnt <= ncpus2 && cnt <= cnt_max,
2745             ("calculate cnt %d, ncpus2 %d, cnt max %d",
2746              cnt, ncpus2, cnt_max));
2747         return cnt;
2748 }