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/9.0/sys/net/if_llatbl.c 222143 2011-05-20 19:12:20Z qingli $");
   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_FREE_LOCKED(lle);
  129 
  130         return (pkts_dropped);
  131 }
  132 
  133 /*
  134  * Update an llentry for address dst (equivalent to rtalloc for new-arp)
  135  * Caller must pass in a valid struct llentry * (or NULL)
  136  *
  137  * if found the llentry * is returned referenced and unlocked
  138  */
  139 int
  140 llentry_update(struct llentry **llep, struct lltable *lt,
  141     struct sockaddr_storage *dst, struct ifnet *ifp)
  142 {
  143         struct llentry *la;
  144 
  145         IF_AFDATA_RLOCK(ifp);   
  146         la = lla_lookup(lt, LLE_EXCLUSIVE,
  147             (struct sockaddr *)dst);
  148         IF_AFDATA_RUNLOCK(ifp);
  149         if ((la == NULL) && 
  150             (ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) == 0) {
  151                 IF_AFDATA_WLOCK(ifp);
  152                 la = lla_lookup(lt,
  153                     (LLE_CREATE | LLE_EXCLUSIVE),
  154                     (struct sockaddr *)dst);
  155                 IF_AFDATA_WUNLOCK(ifp); 
  156         }
  157         if (la != NULL && (*llep != la)) {
  158                 if (*llep != NULL)
  159                         LLE_FREE(*llep);
  160                 LLE_ADDREF(la);
  161                 LLE_WUNLOCK(la);
  162                 *llep = la;
  163         } else if (la != NULL)
  164                 LLE_WUNLOCK(la);
  165 
  166         if (la == NULL)
  167                 return (ENOENT);
  168 
  169         return (0);
  170 }
  171 
  172 /*
  173  * Free all entries from given table and free itself.
  174  */
  175 void
  176 lltable_free(struct lltable *llt)
  177 {
  178         struct llentry *lle, *next;
  179         int i;
  180 
  181         KASSERT(llt != NULL, ("%s: llt is NULL", __func__));
  182 
  183         LLTABLE_WLOCK();
  184         SLIST_REMOVE(&V_lltables, llt, lltable, llt_link);
  185         LLTABLE_WUNLOCK();
  186 
  187         for (i=0; i < LLTBL_HASHTBL_SIZE; i++) {
  188                 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) {
  189                         int canceled;
  190 
  191                         canceled = callout_drain(&lle->la_timer);
  192                         LLE_WLOCK(lle);
  193                         if (canceled)
  194                                 LLE_REMREF(lle);
  195                         llentry_free(lle);
  196                 }
  197         }
  198 
  199         free(llt, M_LLTABLE);
  200 }
  201 
  202 #if 0
  203 void
  204 lltable_drain(int af)
  205 {
  206         struct lltable  *llt;
  207         struct llentry  *lle;
  208         register int i;
  209 
  210         LLTABLE_RLOCK();
  211         SLIST_FOREACH(llt, &V_lltables, llt_link) {
  212                 if (llt->llt_af != af)
  213                         continue;
  214 
  215                 for (i=0; i < LLTBL_HASHTBL_SIZE; i++) {
  216                         LIST_FOREACH(lle, &llt->lle_head[i], lle_next) {
  217                                 LLE_WLOCK(lle);
  218                                 if (lle->la_hold) {
  219                                         m_freem(lle->la_hold);
  220                                         lle->la_hold = NULL;
  221                                 }
  222                                 LLE_WUNLOCK(lle);
  223                         }
  224                 }
  225         }
  226         LLTABLE_RUNLOCK();
  227 }
  228 #endif
  229 
  230 void
  231 lltable_prefix_free(int af, struct sockaddr *prefix, struct sockaddr *mask,
  232             u_int flags)
  233 {
  234         struct lltable *llt;
  235 
  236         LLTABLE_RLOCK();
  237         SLIST_FOREACH(llt, &V_lltables, llt_link) {
  238                 if (llt->llt_af != af)
  239                         continue;
  240 
  241                 llt->llt_prefix_free(llt, prefix, mask, flags);
  242         }
  243         LLTABLE_RUNLOCK();
  244 }
  245 
  246 
  247 
  248 /*
  249  * Create a new lltable.
  250  */
  251 struct lltable *
  252 lltable_init(struct ifnet *ifp, int af)
  253 {
  254         struct lltable *llt;
  255         register int i;
  256 
  257         llt = malloc(sizeof(struct lltable), M_LLTABLE, M_WAITOK);
  258 
  259         llt->llt_af = af;
  260         llt->llt_ifp = ifp;
  261         for (i = 0; i < LLTBL_HASHTBL_SIZE; i++)
  262                 LIST_INIT(&llt->lle_head[i]);
  263 
  264         LLTABLE_WLOCK();
  265         SLIST_INSERT_HEAD(&V_lltables, llt, llt_link);
  266         LLTABLE_WUNLOCK();
  267 
  268         return (llt);
  269 }
  270 
  271 /*
  272  * Called in route_output when adding/deleting a route to an interface.
  273  */
  274 int
  275 lla_rt_output(struct rt_msghdr *rtm, struct rt_addrinfo *info)
  276 {
  277         struct sockaddr_dl *dl =
  278             (struct sockaddr_dl *)info->rti_info[RTAX_GATEWAY];
  279         struct sockaddr *dst = (struct sockaddr *)info->rti_info[RTAX_DST];
  280         struct ifnet *ifp;
  281         struct lltable *llt;
  282         struct llentry *lle;
  283         u_int laflags = 0, flags = 0;
  284         int error = 0;
  285 
  286         if (dl == NULL || dl->sdl_family != AF_LINK) {
  287                 log(LOG_INFO, "%s: invalid dl\n", __func__);
  288                 return EINVAL;
  289         }
  290         ifp = ifnet_byindex(dl->sdl_index);
  291         if (ifp == NULL) {
  292                 log(LOG_INFO, "%s: invalid ifp (sdl_index %d)\n",
  293                     __func__, dl->sdl_index);
  294                 return EINVAL;
  295         }
  296 
  297         switch (rtm->rtm_type) {
  298         case RTM_ADD:
  299                 if (rtm->rtm_flags & RTF_ANNOUNCE) {
  300                         flags |= LLE_PUB;
  301 #ifdef INET
  302                         if (dst->sa_family == AF_INET && 
  303                             ((struct sockaddr_inarp *)dst)->sin_other != 0) {
  304                                 struct rtentry *rt;
  305                                 ((struct sockaddr_inarp *)dst)->sin_other = 0;
  306                                 rt = rtalloc1(dst, 0, 0);
  307                                 if (rt == NULL || !(rt->rt_flags & RTF_HOST)) {
  308                                         log(LOG_INFO, "%s: RTM_ADD publish "
  309                                             "(proxy only) is invalid\n",
  310                                             __func__);
  311                                         if (rt)
  312                                                 RTFREE_LOCKED(rt);
  313                                         return EINVAL;
  314                                 }
  315                                 RTFREE_LOCKED(rt);
  316 
  317                                 flags |= LLE_PROXY;
  318                         }
  319 #endif
  320                 }
  321                 flags |= LLE_CREATE;
  322                 break;
  323 
  324         case RTM_DELETE:
  325                 flags |= LLE_DELETE;
  326                 break;
  327 
  328         case RTM_CHANGE:
  329                 break;
  330 
  331         default:
  332                 return EINVAL; /* XXX not implemented yet */
  333         }
  334 
  335         /* XXX linked list may be too expensive */
  336         LLTABLE_RLOCK();
  337         SLIST_FOREACH(llt, &V_lltables, llt_link) {
  338                 if (llt->llt_af == dst->sa_family &&
  339                     llt->llt_ifp == ifp)
  340                         break;
  341         }
  342         LLTABLE_RUNLOCK();
  343         KASSERT(llt != NULL, ("Yep, ugly hacks are bad\n"));
  344 
  345         if (flags & LLE_CREATE)
  346                 flags |= LLE_EXCLUSIVE;
  347         
  348         IF_AFDATA_LOCK(ifp);
  349         lle = lla_lookup(llt, flags, dst);
  350         IF_AFDATA_UNLOCK(ifp);
  351         if (LLE_IS_VALID(lle)) {
  352                 if (flags & LLE_CREATE) {
  353                         /*
  354                          * If we delay the delete, then a subsequent
  355                          * "arp add" should look up this entry, reset the
  356                          * LLE_DELETED flag, and reset the expiration timer
  357                          */
  358                         bcopy(LLADDR(dl), &lle->ll_addr, ifp->if_addrlen);
  359                         lle->la_flags |= (flags & (LLE_PUB | LLE_PROXY));
  360                         lle->la_flags |= LLE_VALID;
  361                         lle->la_flags &= ~LLE_DELETED;
  362 #ifdef INET6
  363                         /*
  364                          * ND6
  365                          */
  366                         if (dst->sa_family == AF_INET6)
  367                                 lle->ln_state = ND6_LLINFO_REACHABLE;
  368 #endif
  369                         /*
  370                          * NB: arp and ndp always set (RTF_STATIC | RTF_HOST)
  371                          */
  372 
  373                         if (rtm->rtm_rmx.rmx_expire == 0) {
  374                                 lle->la_flags |= LLE_STATIC;
  375                                 lle->la_expire = 0;
  376                         } else
  377                                 lle->la_expire = rtm->rtm_rmx.rmx_expire;
  378                         laflags = lle->la_flags;
  379                         LLE_WUNLOCK(lle);
  380 #ifdef INET
  381                         /*  gratuitous ARP */
  382                         if ((laflags & LLE_PUB) && dst->sa_family == AF_INET) {
  383                                 arprequest(ifp, 
  384                                     &((struct sockaddr_in *)dst)->sin_addr,
  385                                     &((struct sockaddr_in *)dst)->sin_addr,
  386                                     ((laflags & LLE_PROXY) ?
  387                                         (u_char *)IF_LLADDR(ifp) :
  388                                         (u_char *)LLADDR(dl)));
  389                         }
  390 #endif
  391                 } else {
  392                         if (flags & LLE_EXCLUSIVE)
  393                                 LLE_WUNLOCK(lle);
  394                         else
  395                                 LLE_RUNLOCK(lle);
  396                 }
  397         } else if ((lle == NULL) && (flags & LLE_DELETE))
  398                 error = EINVAL;
  399 
  400 
  401         return (error);
  402 }
  403 
  404 static void
  405 vnet_lltable_init()
  406 {
  407 
  408         SLIST_INIT(&V_lltables);
  409 }
  410 VNET_SYSINIT(vnet_lltable_init, SI_SUB_PSEUDO, SI_ORDER_FIRST,
  411     vnet_lltable_init, NULL);
  412 
  413 #ifdef DDB
  414 struct llentry_sa {
  415         struct llentry          base;
  416         struct sockaddr         l3_addr;
  417 };
  418 
  419 static void
  420 llatbl_lle_show(struct llentry_sa *la)
  421 {
  422         struct llentry *lle;
  423         uint8_t octet[6];
  424 
  425         lle = &la->base;
  426         db_printf("lle=%p\n", lle);
  427         db_printf(" lle_next=%p\n", lle->lle_next.le_next);
  428         db_printf(" lle_lock=%p\n", &lle->lle_lock);
  429         db_printf(" lle_tbl=%p\n", lle->lle_tbl);
  430         db_printf(" lle_head=%p\n", lle->lle_head);
  431         db_printf(" la_hold=%p\n", lle->la_hold);
  432         db_printf(" la_numheld=%d\n", lle->la_numheld);
  433         db_printf(" la_expire=%ju\n", (uintmax_t)lle->la_expire);
  434         db_printf(" la_flags=0x%04x\n", lle->la_flags);
  435         db_printf(" la_asked=%u\n", lle->la_asked);
  436         db_printf(" la_preempt=%u\n", lle->la_preempt);
  437         db_printf(" ln_byhint=%u\n", lle->ln_byhint);
  438         db_printf(" ln_state=%d\n", lle->ln_state);
  439         db_printf(" ln_router=%u\n", lle->ln_router);
  440         db_printf(" ln_ntick=%ju\n", (uintmax_t)lle->ln_ntick);
  441         db_printf(" lle_refcnt=%d\n", lle->lle_refcnt);
  442         bcopy(&lle->ll_addr.mac16, octet, sizeof(octet));
  443         db_printf(" ll_addr=%02x:%02x:%02x:%02x:%02x:%02x\n",
  444             octet[0], octet[1], octet[2], octet[3], octet[4], octet[5]);
  445         db_printf(" la_timer=%p\n", &lle->la_timer);
  446 
  447         switch (la->l3_addr.sa_family) {
  448 #ifdef INET
  449         case AF_INET:
  450         {
  451                 struct sockaddr_in *sin;
  452                 char l3s[INET_ADDRSTRLEN];
  453 
  454                 sin = (struct sockaddr_in *)&la->l3_addr;
  455                 inet_ntoa_r(sin->sin_addr, l3s);
  456                 db_printf(" l3_addr=%s\n", l3s);        
  457                 break;
  458         }
  459 #endif
  460 #ifdef INET6
  461         case AF_INET6:
  462         {
  463                 struct sockaddr_in6 *sin6;
  464                 char l3s[INET6_ADDRSTRLEN];
  465 
  466                 sin6 = (struct sockaddr_in6 *)&la->l3_addr;
  467                 ip6_sprintf(l3s, &sin6->sin6_addr);
  468                 db_printf(" l3_addr=%s\n", l3s);        
  469                 break;
  470         }
  471 #endif
  472         default:
  473                 db_printf(" l3_addr=N/A (af=%d)\n", la->l3_addr.sa_family);
  474                 break;
  475         }
  476 }
  477 
  478 DB_SHOW_COMMAND(llentry, db_show_llentry)
  479 {
  480 
  481         if (!have_addr) {
  482                 db_printf("usage: show llentry <struct llentry *>\n");
  483                 return;
  484         }
  485 
  486         llatbl_lle_show((struct llentry_sa *)addr);
  487 }
  488 
  489 static void
  490 llatbl_llt_show(struct lltable *llt)
  491 {
  492         int i;
  493         struct llentry *lle;
  494 
  495         db_printf("llt=%p llt_af=%d llt_ifp=%p\n",
  496             llt, llt->llt_af, llt->llt_ifp);
  497 
  498         for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
  499                 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) {
  500 
  501                         llatbl_lle_show((struct llentry_sa *)lle);
  502                         if (db_pager_quit)
  503                                 return;
  504                 }
  505         }
  506 }
  507 
  508 DB_SHOW_COMMAND(lltable, db_show_lltable)
  509 {
  510 
  511         if (!have_addr) {
  512                 db_printf("usage: show lltable <struct lltable *>\n");
  513                 return;
  514         }
  515 
  516         llatbl_llt_show((struct lltable *)addr);
  517 }
  518 
  519 DB_SHOW_ALL_COMMAND(lltables, db_show_all_lltables)
  520 {
  521         VNET_ITERATOR_DECL(vnet_iter);
  522         struct lltable *llt;
  523 
  524         VNET_FOREACH(vnet_iter) {
  525                 CURVNET_SET_QUIET(vnet_iter);
  526 #ifdef VIMAGE
  527                 db_printf("vnet=%p\n", curvnet);
  528 #endif
  529                 SLIST_FOREACH(llt, &V_lltables, llt_link) {
  530                         db_printf("llt=%p llt_af=%d llt_ifp=%p(%s)\n",
  531                             llt, llt->llt_af, llt->llt_ifp,
  532                             (llt->llt_ifp != NULL) ?
  533                                 llt->llt_ifp->if_xname : "?");
  534                         if (have_addr && addr != 0) /* verbose */
  535                                 llatbl_llt_show(llt);
  536                         if (db_pager_quit) {
  537                                 CURVNET_RESTORE();
  538                                 return;
  539                         }
  540                 }
  541                 CURVNET_RESTORE();
  542         }
  543 }
  544 #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
