if_llatbl.c

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    1 /*
    2  * Copyright (c) 2004 Luigi Rizzo, Alessandro Cerri. All rights reserved.
    3  * Copyright (c) 2004-2008 Qing Li. All rights reserved.
    4  * Copyright (c) 2008 Kip Macy. All rights reserved.
    5  * 
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 
   15  * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  */
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/9.1/sys/net/if_llatbl.c 232058 2012-02-23 18:50:19Z kmacy $");
   29 
   30 #include "opt_ddb.h"
   31 #include "opt_inet.h"
   32 #include "opt_inet6.h"
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h>
   36 #include <sys/malloc.h>
   37 #include <sys/mbuf.h>
   38 #include <sys/syslog.h>
   39 #include <sys/sysctl.h>
   40 #include <sys/socket.h>
   41 #include <sys/kernel.h>
   42 #include <sys/lock.h>
   43 #include <sys/mutex.h>
   44 #include <sys/rwlock.h>
   45 
   46 #ifdef DDB
   47 #include <ddb/ddb.h>
   48 #endif
   49 
   50 #include <vm/uma.h>
   51 
   52 #include <netinet/in.h>
   53 #include <net/if_llatbl.h>
   54 #include <net/if.h>
   55 #include <net/if_dl.h>
   56 #include <net/if_var.h>
   57 #include <net/route.h>
   58 #include <net/vnet.h>
   59 #include <netinet/if_ether.h>
   60 #include <netinet6/in6_var.h>
   61 #include <netinet6/nd6.h>
   62 
   63 MALLOC_DEFINE(M_LLTABLE, "lltable", "link level address tables");
   64 
   65 static VNET_DEFINE(SLIST_HEAD(, lltable), lltables);
   66 #define V_lltables      VNET(lltables)
   67 
   68 extern void arprequest(struct ifnet *, struct in_addr *, struct in_addr *,
   69         u_char *);
   70 
   71 static void vnet_lltable_init(void);
   72 
   73 struct rwlock lltable_rwlock;
   74 RW_SYSINIT(lltable_rwlock, &lltable_rwlock, "lltable_rwlock");
   75 
   76 /*
   77  * Dump arp state for a specific address family.
   78  */
   79 int
   80 lltable_sysctl_dumparp(int af, struct sysctl_req *wr)
   81 {
   82         struct lltable *llt;
   83         int error = 0;
   84 
   85         LLTABLE_RLOCK();
   86         SLIST_FOREACH(llt, &V_lltables, llt_link) {
   87                 if (llt->llt_af == af) {
   88                         error = llt->llt_dump(llt, wr);
   89                         if (error != 0)
   90                                 goto done;
   91                 }
   92         }
   93 done:
   94         LLTABLE_RUNLOCK();
   95         return (error);
   96 }
   97 
   98 /*
   99  * Deletes an address from the address table.
  100  * This function is called by the timer functions
  101  * such as arptimer() and nd6_llinfo_timer(), and
  102  * the caller does the locking.
  103  *
  104  * Returns the number of held packets, if any, that were dropped.
  105  */
  106 size_t
  107 llentry_free(struct llentry *lle)
  108 {
  109         size_t pkts_dropped;
  110         struct mbuf *next;
  111 
  112         pkts_dropped = 0;
  113         LLE_WLOCK_ASSERT(lle);
  114         LIST_REMOVE(lle, lle_next);
  115 
  116         while ((lle->la_numheld > 0) && (lle->la_hold != NULL)) {
  117                 next = lle->la_hold->m_nextpkt;
  118                 m_freem(lle->la_hold);
  119                 lle->la_hold = next;
  120                 lle->la_numheld--;
  121                 pkts_dropped++;
  122         }
  123 
  124         KASSERT(lle->la_numheld == 0, 
  125                 ("%s: la_numheld %d > 0, pkts_droped %zd", __func__, 
  126                  lle->la_numheld, pkts_dropped));
  127 
  128         lle->la_flags &= ~LLE_VALID;
  129         LLE_FREE_LOCKED(lle);
  130 
  131         return (pkts_dropped);
  132 }
  133 
  134 /*
  135  * Update an llentry for address dst (equivalent to rtalloc for new-arp)
  136  * Caller must pass in a valid struct llentry * (or NULL)
  137  *
  138  * if found the llentry * is returned referenced and unlocked
  139  */
  140 int
  141 llentry_update(struct llentry **llep, struct lltable *lt,
  142     struct sockaddr_storage *dst, struct ifnet *ifp)
  143 {
  144         struct llentry *la;
  145 
  146         IF_AFDATA_RLOCK(ifp);   
  147         la = lla_lookup(lt, LLE_EXCLUSIVE,
  148             (struct sockaddr *)dst);
  149         IF_AFDATA_RUNLOCK(ifp);
  150         if ((la == NULL) && 
  151             (ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) == 0) {
  152                 IF_AFDATA_WLOCK(ifp);
  153                 la = lla_lookup(lt,
  154                     (LLE_CREATE | LLE_EXCLUSIVE),
  155                     (struct sockaddr *)dst);
  156                 IF_AFDATA_WUNLOCK(ifp); 
  157         }
  158         if (la != NULL && (*llep != la)) {
  159                 if (*llep != NULL)
  160                         LLE_FREE(*llep);
  161                 LLE_ADDREF(la);
  162                 LLE_WUNLOCK(la);
  163                 *llep = la;
  164         } else if (la != NULL)
  165                 LLE_WUNLOCK(la);
  166 
  167         if (la == NULL)
  168                 return (ENOENT);
  169 
  170         return (0);
  171 }
  172 
  173 /*
  174  * Free all entries from given table and free itself.
  175  */
  176 void
  177 lltable_free(struct lltable *llt)
  178 {
  179         struct llentry *lle, *next;
  180         int i;
  181 
  182         KASSERT(llt != NULL, ("%s: llt is NULL", __func__));
  183 
  184         LLTABLE_WLOCK();
  185         SLIST_REMOVE(&V_lltables, llt, lltable, llt_link);
  186         LLTABLE_WUNLOCK();
  187 
  188         for (i=0; i < LLTBL_HASHTBL_SIZE; i++) {
  189                 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) {
  190                         int canceled;
  191 
  192                         canceled = callout_drain(&lle->la_timer);
  193                         LLE_WLOCK(lle);
  194                         if (canceled)
  195                                 LLE_REMREF(lle);
  196                         llentry_free(lle);
  197                 }
  198         }
  199 
  200         free(llt, M_LLTABLE);
  201 }
  202 
  203 #if 0
  204 void
  205 lltable_drain(int af)
  206 {
  207         struct lltable  *llt;
  208         struct llentry  *lle;
  209         register int i;
  210 
  211         LLTABLE_RLOCK();
  212         SLIST_FOREACH(llt, &V_lltables, llt_link) {
  213                 if (llt->llt_af != af)
  214                         continue;
  215 
  216                 for (i=0; i < LLTBL_HASHTBL_SIZE; i++) {
  217                         LIST_FOREACH(lle, &llt->lle_head[i], lle_next) {
  218                                 LLE_WLOCK(lle);
  219                                 if (lle->la_hold) {
  220                                         m_freem(lle->la_hold);
  221                                         lle->la_hold = NULL;
  222                                 }
  223                                 LLE_WUNLOCK(lle);
  224                         }
  225                 }
  226         }
  227         LLTABLE_RUNLOCK();
  228 }
  229 #endif
  230 
  231 void
  232 lltable_prefix_free(int af, struct sockaddr *prefix, struct sockaddr *mask,
  233             u_int flags)
  234 {
  235         struct lltable *llt;
  236 
  237         LLTABLE_RLOCK();
  238         SLIST_FOREACH(llt, &V_lltables, llt_link) {
  239                 if (llt->llt_af != af)
  240                         continue;
  241 
  242                 llt->llt_prefix_free(llt, prefix, mask, flags);
  243         }
  244         LLTABLE_RUNLOCK();
  245 }
  246 
  247 
  248 
  249 /*
  250  * Create a new lltable.
  251  */
  252 struct lltable *
  253 lltable_init(struct ifnet *ifp, int af)
  254 {
  255         struct lltable *llt;
  256         register int i;
  257 
  258         llt = malloc(sizeof(struct lltable), M_LLTABLE, M_WAITOK);
  259 
  260         llt->llt_af = af;
  261         llt->llt_ifp = ifp;
  262         for (i = 0; i < LLTBL_HASHTBL_SIZE; i++)
  263                 LIST_INIT(&llt->lle_head[i]);
  264 
  265         LLTABLE_WLOCK();
  266         SLIST_INSERT_HEAD(&V_lltables, llt, llt_link);
  267         LLTABLE_WUNLOCK();
  268 
  269         return (llt);
  270 }
  271 
  272 /*
  273  * Called in route_output when adding/deleting a route to an interface.
  274  */
  275 int
  276 lla_rt_output(struct rt_msghdr *rtm, struct rt_addrinfo *info)
  277 {
  278         struct sockaddr_dl *dl =
  279             (struct sockaddr_dl *)info->rti_info[RTAX_GATEWAY];
  280         struct sockaddr *dst = (struct sockaddr *)info->rti_info[RTAX_DST];
  281         struct ifnet *ifp;
  282         struct lltable *llt;
  283         struct llentry *lle;
  284         u_int laflags = 0, flags = 0;
  285         int error = 0;
  286 
  287         if (dl == NULL || dl->sdl_family != AF_LINK) {
  288                 log(LOG_INFO, "%s: invalid dl\n", __func__);
  289                 return EINVAL;
  290         }
  291         ifp = ifnet_byindex(dl->sdl_index);
  292         if (ifp == NULL) {
  293                 log(LOG_INFO, "%s: invalid ifp (sdl_index %d)\n",
  294                     __func__, dl->sdl_index);
  295                 return EINVAL;
  296         }
  297 
  298         switch (rtm->rtm_type) {
  299         case RTM_ADD:
  300                 if (rtm->rtm_flags & RTF_ANNOUNCE) {
  301                         flags |= LLE_PUB;
  302 #ifdef INET
  303                         if (dst->sa_family == AF_INET && 
  304                             ((struct sockaddr_inarp *)dst)->sin_other != 0) {
  305                                 struct rtentry *rt;
  306                                 ((struct sockaddr_inarp *)dst)->sin_other = 0;
  307                                 rt = rtalloc1(dst, 0, 0);
  308                                 if (rt == NULL || !(rt->rt_flags & RTF_HOST)) {
  309                                         log(LOG_INFO, "%s: RTM_ADD publish "
  310                                             "(proxy only) is invalid\n",
  311                                             __func__);
  312                                         if (rt)
  313                                                 RTFREE_LOCKED(rt);
  314                                         return EINVAL;
  315                                 }
  316                                 RTFREE_LOCKED(rt);
  317 
  318                                 flags |= LLE_PROXY;
  319                         }
  320 #endif
  321                 }
  322                 flags |= LLE_CREATE;
  323                 break;
  324 
  325         case RTM_DELETE:
  326                 flags |= LLE_DELETE;
  327                 break;
  328 
  329         case RTM_CHANGE:
  330                 break;
  331 
  332         default:
  333                 return EINVAL; /* XXX not implemented yet */
  334         }
  335 
  336         /* XXX linked list may be too expensive */
  337         LLTABLE_RLOCK();
  338         SLIST_FOREACH(llt, &V_lltables, llt_link) {
  339                 if (llt->llt_af == dst->sa_family &&
  340                     llt->llt_ifp == ifp)
  341                         break;
  342         }
  343         LLTABLE_RUNLOCK();
  344         KASSERT(llt != NULL, ("Yep, ugly hacks are bad\n"));
  345 
  346         if (flags & LLE_CREATE)
  347                 flags |= LLE_EXCLUSIVE;
  348         
  349         IF_AFDATA_LOCK(ifp);
  350         lle = lla_lookup(llt, flags, dst);
  351         IF_AFDATA_UNLOCK(ifp);
  352         if (LLE_IS_VALID(lle)) {
  353                 if (flags & LLE_CREATE) {
  354                         /*
  355                          * If we delay the delete, then a subsequent
  356                          * "arp add" should look up this entry, reset the
  357                          * LLE_DELETED flag, and reset the expiration timer
  358                          */
  359                         bcopy(LLADDR(dl), &lle->ll_addr, ifp->if_addrlen);
  360                         lle->la_flags |= (flags & (LLE_PUB | LLE_PROXY));
  361                         lle->la_flags |= LLE_VALID;
  362                         lle->la_flags &= ~LLE_DELETED;
  363 #ifdef INET6
  364                         /*
  365                          * ND6
  366                          */
  367                         if (dst->sa_family == AF_INET6)
  368                                 lle->ln_state = ND6_LLINFO_REACHABLE;
  369 #endif
  370                         /*
  371                          * NB: arp and ndp always set (RTF_STATIC | RTF_HOST)
  372                          */
  373 
  374                         if (rtm->rtm_rmx.rmx_expire == 0) {
  375                                 lle->la_flags |= LLE_STATIC;
  376                                 lle->la_expire = 0;
  377                         } else
  378                                 lle->la_expire = rtm->rtm_rmx.rmx_expire;
  379                         laflags = lle->la_flags;
  380                         LLE_WUNLOCK(lle);
  381 #ifdef INET
  382                         /*  gratuitous ARP */
  383                         if ((laflags & LLE_PUB) && dst->sa_family == AF_INET) {
  384                                 arprequest(ifp, 
  385                                     &((struct sockaddr_in *)dst)->sin_addr,
  386                                     &((struct sockaddr_in *)dst)->sin_addr,
  387                                     ((laflags & LLE_PROXY) ?
  388                                         (u_char *)IF_LLADDR(ifp) :
  389                                         (u_char *)LLADDR(dl)));
  390                         }
  391 #endif
  392                 } else {
  393                         if (flags & LLE_EXCLUSIVE)
  394                                 LLE_WUNLOCK(lle);
  395                         else
  396                                 LLE_RUNLOCK(lle);
  397                 }
  398         } else if ((lle == NULL) && (flags & LLE_DELETE))
  399                 error = EINVAL;
  400 
  401 
  402         return (error);
  403 }
  404 
  405 static void
  406 vnet_lltable_init()
  407 {
  408 
  409         SLIST_INIT(&V_lltables);
  410 }
  411 VNET_SYSINIT(vnet_lltable_init, SI_SUB_PSEUDO, SI_ORDER_FIRST,
  412     vnet_lltable_init, NULL);
  413 
  414 #ifdef DDB
  415 struct llentry_sa {
  416         struct llentry          base;
  417         struct sockaddr         l3_addr;
  418 };
  419 
  420 static void
  421 llatbl_lle_show(struct llentry_sa *la)
  422 {
  423         struct llentry *lle;
  424         uint8_t octet[6];
  425 
  426         lle = &la->base;
  427         db_printf("lle=%p\n", lle);
  428         db_printf(" lle_next=%p\n", lle->lle_next.le_next);
  429         db_printf(" lle_lock=%p\n", &lle->lle_lock);
  430         db_printf(" lle_tbl=%p\n", lle->lle_tbl);
  431         db_printf(" lle_head=%p\n", lle->lle_head);
  432         db_printf(" la_hold=%p\n", lle->la_hold);
  433         db_printf(" la_numheld=%d\n", lle->la_numheld);
  434         db_printf(" la_expire=%ju\n", (uintmax_t)lle->la_expire);
  435         db_printf(" la_flags=0x%04x\n", lle->la_flags);
  436         db_printf(" la_asked=%u\n", lle->la_asked);
  437         db_printf(" la_preempt=%u\n", lle->la_preempt);
  438         db_printf(" ln_byhint=%u\n", lle->ln_byhint);
  439         db_printf(" ln_state=%d\n", lle->ln_state);
  440         db_printf(" ln_router=%u\n", lle->ln_router);
  441         db_printf(" ln_ntick=%ju\n", (uintmax_t)lle->ln_ntick);
  442         db_printf(" lle_refcnt=%d\n", lle->lle_refcnt);
  443         bcopy(&lle->ll_addr.mac16, octet, sizeof(octet));
  444         db_printf(" ll_addr=%02x:%02x:%02x:%02x:%02x:%02x\n",
  445             octet[0], octet[1], octet[2], octet[3], octet[4], octet[5]);
  446         db_printf(" la_timer=%p\n", &lle->la_timer);
  447 
  448         switch (la->l3_addr.sa_family) {
  449 #ifdef INET
  450         case AF_INET:
  451         {
  452                 struct sockaddr_in *sin;
  453                 char l3s[INET_ADDRSTRLEN];
  454 
  455                 sin = (struct sockaddr_in *)&la->l3_addr;
  456                 inet_ntoa_r(sin->sin_addr, l3s);
  457                 db_printf(" l3_addr=%s\n", l3s);        
  458                 break;
  459         }
  460 #endif
  461 #ifdef INET6
  462         case AF_INET6:
  463         {
  464                 struct sockaddr_in6 *sin6;
  465                 char l3s[INET6_ADDRSTRLEN];
  466 
  467                 sin6 = (struct sockaddr_in6 *)&la->l3_addr;
  468                 ip6_sprintf(l3s, &sin6->sin6_addr);
  469                 db_printf(" l3_addr=%s\n", l3s);        
  470                 break;
  471         }
  472 #endif
  473         default:
  474                 db_printf(" l3_addr=N/A (af=%d)\n", la->l3_addr.sa_family);
  475                 break;
  476         }
  477 }
  478 
  479 DB_SHOW_COMMAND(llentry, db_show_llentry)
  480 {
  481 
  482         if (!have_addr) {
  483                 db_printf("usage: show llentry <struct llentry *>\n");
  484                 return;
  485         }
  486 
  487         llatbl_lle_show((struct llentry_sa *)addr);
  488 }
  489 
  490 static void
  491 llatbl_llt_show(struct lltable *llt)
  492 {
  493         int i;
  494         struct llentry *lle;
  495 
  496         db_printf("llt=%p llt_af=%d llt_ifp=%p\n",
  497             llt, llt->llt_af, llt->llt_ifp);
  498 
  499         for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
  500                 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) {
  501 
  502                         llatbl_lle_show((struct llentry_sa *)lle);
  503                         if (db_pager_quit)
  504                                 return;
  505                 }
  506         }
  507 }
  508 
  509 DB_SHOW_COMMAND(lltable, db_show_lltable)
  510 {
  511 
  512         if (!have_addr) {
  513                 db_printf("usage: show lltable <struct lltable *>\n");
  514                 return;
  515         }
  516 
  517         llatbl_llt_show((struct lltable *)addr);
  518 }
  519 
  520 DB_SHOW_ALL_COMMAND(lltables, db_show_all_lltables)
  521 {
  522         VNET_ITERATOR_DECL(vnet_iter);
  523         struct lltable *llt;
  524 
  525         VNET_FOREACH(vnet_iter) {
  526                 CURVNET_SET_QUIET(vnet_iter);
  527 #ifdef VIMAGE
  528                 db_printf("vnet=%p\n", curvnet);
  529 #endif
  530                 SLIST_FOREACH(llt, &V_lltables, llt_link) {
  531                         db_printf("llt=%p llt_af=%d llt_ifp=%p(%s)\n",
  532                             llt, llt->llt_af, llt->llt_ifp,
  533                             (llt->llt_ifp != NULL) ?
  534                                 llt->llt_ifp->if_xname : "?");
  535                         if (have_addr && addr != 0) /* verbose */
  536                                 llatbl_llt_show(llt);
  537                         if (db_pager_quit) {
  538                                 CURVNET_RESTORE();
  539                                 return;
  540                         }
  541                 }
  542                 CURVNET_RESTORE();
  543         }
  544 }
  545 #endif
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FreeBSD/Linux Kernel Cross Reference sys/net/if_llatbl.c

FreeBSD/Linux Kernel Cross Reference
sys/net/if_llatbl.c
