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("$FreeBSD$");
   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         IF_AFDATA_WLOCK_ASSERT(lle->lle_tbl->llt_ifp);
  113         LLE_WLOCK_ASSERT(lle);
  114 
  115         /* XXX: guard against race with other llentry_free(). */
  116         if (!(lle->la_flags & LLE_LINKED)) {
  117                 LLE_FREE_LOCKED(lle);
  118                 return (0);
  119         }
  120 
  121         LIST_REMOVE(lle, lle_next);
  122         lle->la_flags &= ~(LLE_VALID | LLE_LINKED);
  123 
  124         pkts_dropped = 0;
  125         while ((lle->la_numheld > 0) && (lle->la_hold != NULL)) {
  126                 next = lle->la_hold->m_nextpkt;
  127                 m_freem(lle->la_hold);
  128                 lle->la_hold = next;
  129                 lle->la_numheld--;
  130                 pkts_dropped++;
  131         }
  132 
  133         KASSERT(lle->la_numheld == 0, 
  134                 ("%s: la_numheld %d > 0, pkts_droped %zd", __func__, 
  135                  lle->la_numheld, pkts_dropped));
  136 
  137         LLE_FREE_LOCKED(lle);
  138 
  139         return (pkts_dropped);
  140 }
  141 
  142 /*
  143  * Update an llentry for address dst (equivalent to rtalloc for new-arp)
  144  * Caller must pass in a valid struct llentry * (or NULL)
  145  *
  146  * if found the llentry * is returned referenced and unlocked
  147  */
  148 int
  149 llentry_update(struct llentry **llep, struct lltable *lt,
  150     struct sockaddr_storage *dst, struct ifnet *ifp)
  151 {
  152         struct llentry *la;
  153 
  154         IF_AFDATA_RLOCK(ifp);   
  155         la = lla_lookup(lt, LLE_EXCLUSIVE,
  156             (struct sockaddr *)dst);
  157         IF_AFDATA_RUNLOCK(ifp);
  158         if ((la == NULL) && 
  159             (ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) == 0) {
  160                 IF_AFDATA_WLOCK(ifp);
  161                 la = lla_lookup(lt,
  162                     (LLE_CREATE | LLE_EXCLUSIVE),
  163                     (struct sockaddr *)dst);
  164                 IF_AFDATA_WUNLOCK(ifp); 
  165         }
  166         if (la != NULL && (*llep != la)) {
  167                 if (*llep != NULL)
  168                         LLE_FREE(*llep);
  169                 LLE_ADDREF(la);
  170                 LLE_WUNLOCK(la);
  171                 *llep = la;
  172         } else if (la != NULL)
  173                 LLE_WUNLOCK(la);
  174 
  175         if (la == NULL)
  176                 return (ENOENT);
  177 
  178         return (0);
  179 }
  180 
  181 /*
  182  * Free all entries from given table and free itself.
  183  */
  184 void
  185 lltable_free(struct lltable *llt)
  186 {
  187         struct llentry *lle, *next;
  188         int i;
  189 
  190         KASSERT(llt != NULL, ("%s: llt is NULL", __func__));
  191 
  192         LLTABLE_WLOCK();
  193         SLIST_REMOVE(&V_lltables, llt, lltable, llt_link);
  194         LLTABLE_WUNLOCK();
  195 
  196         IF_AFDATA_WLOCK(llt->llt_ifp);
  197         for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
  198                 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) {
  199                         LLE_WLOCK(lle);
  200                         if (callout_stop(&lle->la_timer))
  201                                 LLE_REMREF(lle);
  202                         llentry_free(lle);
  203                 }
  204         }
  205         IF_AFDATA_WUNLOCK(llt->llt_ifp);
  206 
  207         free(llt, M_LLTABLE);
  208 }
  209 
  210 #if 0
  211 void
  212 lltable_drain(int af)
  213 {
  214         struct lltable  *llt;
  215         struct llentry  *lle;
  216         register int i;
  217 
  218         LLTABLE_RLOCK();
  219         SLIST_FOREACH(llt, &V_lltables, llt_link) {
  220                 if (llt->llt_af != af)
  221                         continue;
  222 
  223                 for (i=0; i < LLTBL_HASHTBL_SIZE; i++) {
  224                         LIST_FOREACH(lle, &llt->lle_head[i], lle_next) {
  225                                 LLE_WLOCK(lle);
  226                                 if (lle->la_hold) {
  227                                         m_freem(lle->la_hold);
  228                                         lle->la_hold = NULL;
  229                                 }
  230                                 LLE_WUNLOCK(lle);
  231                         }
  232                 }
  233         }
  234         LLTABLE_RUNLOCK();
  235 }
  236 #endif
  237 
  238 void
  239 lltable_prefix_free(int af, struct sockaddr *prefix, struct sockaddr *mask,
  240             u_int flags)
  241 {
  242         struct lltable *llt;
  243 
  244         LLTABLE_RLOCK();
  245         SLIST_FOREACH(llt, &V_lltables, llt_link) {
  246                 if (llt->llt_af != af)
  247                         continue;
  248 
  249                 llt->llt_prefix_free(llt, prefix, mask, flags);
  250         }
  251         LLTABLE_RUNLOCK();
  252 }
  253 
  254 
  255 
  256 /*
  257  * Create a new lltable.
  258  */
  259 struct lltable *
  260 lltable_init(struct ifnet *ifp, int af)
  261 {
  262         struct lltable *llt;
  263         register int i;
  264 
  265         llt = malloc(sizeof(struct lltable), M_LLTABLE, M_WAITOK);
  266 
  267         llt->llt_af = af;
  268         llt->llt_ifp = ifp;
  269         for (i = 0; i < LLTBL_HASHTBL_SIZE; i++)
  270                 LIST_INIT(&llt->lle_head[i]);
  271 
  272         LLTABLE_WLOCK();
  273         SLIST_INSERT_HEAD(&V_lltables, llt, llt_link);
  274         LLTABLE_WUNLOCK();
  275 
  276         return (llt);
  277 }
  278 
  279 /*
  280  * Called in route_output when adding/deleting a route to an interface.
  281  */
  282 int
  283 lla_rt_output(struct rt_msghdr *rtm, struct rt_addrinfo *info)
  284 {
  285         struct sockaddr_dl *dl =
  286             (struct sockaddr_dl *)info->rti_info[RTAX_GATEWAY];
  287         struct sockaddr *dst = (struct sockaddr *)info->rti_info[RTAX_DST];
  288         struct ifnet *ifp;
  289         struct lltable *llt;
  290         struct llentry *lle;
  291         u_int laflags = 0, flags = 0;
  292         int error = 0;
  293 
  294         if (dl == NULL || dl->sdl_family != AF_LINK) {
  295                 log(LOG_INFO, "%s: invalid dl\n", __func__);
  296                 return EINVAL;
  297         }
  298         ifp = ifnet_byindex(dl->sdl_index);
  299         if (ifp == NULL) {
  300                 log(LOG_INFO, "%s: invalid ifp (sdl_index %d)\n",
  301                     __func__, dl->sdl_index);
  302                 return EINVAL;
  303         }
  304 
  305         switch (rtm->rtm_type) {
  306         case RTM_ADD:
  307                 if (rtm->rtm_flags & RTF_ANNOUNCE) {
  308                         flags |= LLE_PUB;
  309 #ifdef INET
  310                         if (dst->sa_family == AF_INET && 
  311                             ((struct sockaddr_inarp *)dst)->sin_other != 0) {
  312                                 struct rtentry *rt;
  313                                 ((struct sockaddr_inarp *)dst)->sin_other = 0;
  314                                 rt = rtalloc1(dst, 0, 0);
  315                                 if (rt == NULL || !(rt->rt_flags & RTF_HOST)) {
  316                                         log(LOG_INFO, "%s: RTM_ADD publish "
  317                                             "(proxy only) is invalid\n",
  318                                             __func__);
  319                                         if (rt)
  320                                                 RTFREE_LOCKED(rt);
  321                                         return EINVAL;
  322                                 }
  323                                 RTFREE_LOCKED(rt);
  324 
  325                                 flags |= LLE_PROXY;
  326                         }
  327 #endif
  328                 }
  329                 flags |= LLE_CREATE;
  330                 break;
  331 
  332         case RTM_DELETE:
  333                 flags |= LLE_DELETE;
  334                 break;
  335 
  336         case RTM_CHANGE:
  337                 break;
  338 
  339         default:
  340                 return EINVAL; /* XXX not implemented yet */
  341         }
  342 
  343         /* XXX linked list may be too expensive */
  344         LLTABLE_RLOCK();
  345         SLIST_FOREACH(llt, &V_lltables, llt_link) {
  346                 if (llt->llt_af == dst->sa_family &&
  347                     llt->llt_ifp == ifp)
  348                         break;
  349         }
  350         LLTABLE_RUNLOCK();
  351         KASSERT(llt != NULL, ("Yep, ugly hacks are bad\n"));
  352 
  353         if (flags & LLE_CREATE)
  354                 flags |= LLE_EXCLUSIVE;
  355         
  356         IF_AFDATA_LOCK(ifp);
  357         lle = lla_lookup(llt, flags, dst);
  358         IF_AFDATA_UNLOCK(ifp);
  359         if (LLE_IS_VALID(lle)) {
  360                 if (flags & LLE_CREATE) {
  361                         /*
  362                          * If we delay the delete, then a subsequent
  363                          * "arp add" should look up this entry, reset the
  364                          * LLE_DELETED flag, and reset the expiration timer
  365                          */
  366                         bcopy(LLADDR(dl), &lle->ll_addr, ifp->if_addrlen);
  367                         lle->la_flags |= (flags & (LLE_PUB | LLE_PROXY));
  368                         lle->la_flags |= LLE_VALID;
  369                         lle->la_flags &= ~LLE_DELETED;
  370 #ifdef INET6
  371                         /*
  372                          * ND6
  373                          */
  374                         if (dst->sa_family == AF_INET6)
  375                                 lle->ln_state = ND6_LLINFO_REACHABLE;
  376 #endif
  377                         /*
  378                          * NB: arp and ndp always set (RTF_STATIC | RTF_HOST)
  379                          */
  380 
  381                         if (rtm->rtm_rmx.rmx_expire == 0) {
  382                                 lle->la_flags |= LLE_STATIC;
  383                                 lle->la_expire = 0;
  384                         } else
  385                                 lle->la_expire = rtm->rtm_rmx.rmx_expire;
  386                         laflags = lle->la_flags;
  387                         LLE_WUNLOCK(lle);
  388 #ifdef INET
  389                         /*  gratuitous ARP */
  390                         if ((laflags & LLE_PUB) && dst->sa_family == AF_INET) {
  391                                 arprequest(ifp, 
  392                                     &((struct sockaddr_in *)dst)->sin_addr,
  393                                     &((struct sockaddr_in *)dst)->sin_addr,
  394                                     ((laflags & LLE_PROXY) ?
  395                                         (u_char *)IF_LLADDR(ifp) :
  396                                         (u_char *)LLADDR(dl)));
  397                         }
  398 #endif
  399                 } else {
  400                         if (flags & LLE_EXCLUSIVE)
  401                                 LLE_WUNLOCK(lle);
  402                         else
  403                                 LLE_RUNLOCK(lle);
  404                 }
  405         } else if ((lle == NULL) && (flags & LLE_DELETE))
  406                 error = EINVAL;
  407 
  408 
  409         return (error);
  410 }
  411 
  412 static void
  413 vnet_lltable_init()
  414 {
  415 
  416         SLIST_INIT(&V_lltables);
  417 }
  418 VNET_SYSINIT(vnet_lltable_init, SI_SUB_PSEUDO, SI_ORDER_FIRST,
  419     vnet_lltable_init, NULL);
  420 
  421 #ifdef DDB
  422 struct llentry_sa {
  423         struct llentry          base;
  424         struct sockaddr         l3_addr;
  425 };
  426 
  427 static void
  428 llatbl_lle_show(struct llentry_sa *la)
  429 {
  430         struct llentry *lle;
  431         uint8_t octet[6];
  432 
  433         lle = &la->base;
  434         db_printf("lle=%p\n", lle);
  435         db_printf(" lle_next=%p\n", lle->lle_next.le_next);
  436         db_printf(" lle_lock=%p\n", &lle->lle_lock);
  437         db_printf(" lle_tbl=%p\n", lle->lle_tbl);
  438         db_printf(" lle_head=%p\n", lle->lle_head);
  439         db_printf(" la_hold=%p\n", lle->la_hold);
  440         db_printf(" la_numheld=%d\n", lle->la_numheld);
  441         db_printf(" la_expire=%ju\n", (uintmax_t)lle->la_expire);
  442         db_printf(" la_flags=0x%04x\n", lle->la_flags);
  443         db_printf(" la_asked=%u\n", lle->la_asked);
  444         db_printf(" la_preempt=%u\n", lle->la_preempt);
  445         db_printf(" ln_byhint=%u\n", lle->ln_byhint);
  446         db_printf(" ln_state=%d\n", lle->ln_state);
  447         db_printf(" ln_router=%u\n", lle->ln_router);
  448         db_printf(" ln_ntick=%ju\n", (uintmax_t)lle->ln_ntick);
  449         db_printf(" lle_refcnt=%d\n", lle->lle_refcnt);
  450         bcopy(&lle->ll_addr.mac16, octet, sizeof(octet));
  451         db_printf(" ll_addr=%02x:%02x:%02x:%02x:%02x:%02x\n",
  452             octet[0], octet[1], octet[2], octet[3], octet[4], octet[5]);
  453         db_printf(" la_timer=%p\n", &lle->la_timer);
  454 
  455         switch (la->l3_addr.sa_family) {
  456 #ifdef INET
  457         case AF_INET:
  458         {
  459                 struct sockaddr_in *sin;
  460                 char l3s[INET_ADDRSTRLEN];
  461 
  462                 sin = (struct sockaddr_in *)&la->l3_addr;
  463                 inet_ntoa_r(sin->sin_addr, l3s);
  464                 db_printf(" l3_addr=%s\n", l3s);        
  465                 break;
  466         }
  467 #endif
  468 #ifdef INET6
  469         case AF_INET6:
  470         {
  471                 struct sockaddr_in6 *sin6;
  472                 char l3s[INET6_ADDRSTRLEN];
  473 
  474                 sin6 = (struct sockaddr_in6 *)&la->l3_addr;
  475                 ip6_sprintf(l3s, &sin6->sin6_addr);
  476                 db_printf(" l3_addr=%s\n", l3s);        
  477                 break;
  478         }
  479 #endif
  480         default:
  481                 db_printf(" l3_addr=N/A (af=%d)\n", la->l3_addr.sa_family);
  482                 break;
  483         }
  484 }
  485 
  486 DB_SHOW_COMMAND(llentry, db_show_llentry)
  487 {
  488 
  489         if (!have_addr) {
  490                 db_printf("usage: show llentry <struct llentry *>\n");
  491                 return;
  492         }
  493 
  494         llatbl_lle_show((struct llentry_sa *)addr);
  495 }
  496 
  497 static void
  498 llatbl_llt_show(struct lltable *llt)
  499 {
  500         int i;
  501         struct llentry *lle;
  502 
  503         db_printf("llt=%p llt_af=%d llt_ifp=%p\n",
  504             llt, llt->llt_af, llt->llt_ifp);
  505 
  506         for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
  507                 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) {
  508 
  509                         llatbl_lle_show((struct llentry_sa *)lle);
  510                         if (db_pager_quit)
  511                                 return;
  512                 }
  513         }
  514 }
  515 
  516 DB_SHOW_COMMAND(lltable, db_show_lltable)
  517 {
  518 
  519         if (!have_addr) {
  520                 db_printf("usage: show lltable <struct lltable *>\n");
  521                 return;
  522         }
  523 
  524         llatbl_llt_show((struct lltable *)addr);
  525 }
  526 
  527 DB_SHOW_ALL_COMMAND(lltables, db_show_all_lltables)
  528 {
  529         VNET_ITERATOR_DECL(vnet_iter);
  530         struct lltable *llt;
  531 
  532         VNET_FOREACH(vnet_iter) {
  533                 CURVNET_SET_QUIET(vnet_iter);
  534 #ifdef VIMAGE
  535                 db_printf("vnet=%p\n", curvnet);
  536 #endif
  537                 SLIST_FOREACH(llt, &V_lltables, llt_link) {
  538                         db_printf("llt=%p llt_af=%d llt_ifp=%p(%s)\n",
  539                             llt, llt->llt_af, llt->llt_ifp,
  540                             (llt->llt_ifp != NULL) ?
  541                                 llt->llt_ifp->if_xname : "?");
  542                         if (have_addr && addr != 0) /* verbose */
  543                                 llatbl_llt_show(llt);
  544                         if (db_pager_quit) {
  545                                 CURVNET_RESTORE();
  546                                 return;
  547                         }
  548                 }
  549                 CURVNET_RESTORE();
  550         }
  551 }
  552 #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
