The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netpfil/pf/pf_if.c

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    1 /*-
    2  * Copyright (c) 2001 Daniel Hartmeier
    3  * Copyright (c) 2003 Cedric Berger
    4  * Copyright (c) 2005 Henning Brauer <henning@openbsd.org>
    5  * Copyright (c) 2005 Ryan McBride <mcbride@openbsd.org>
    6  * Copyright (c) 2012 Gleb Smirnoff <glebius@FreeBSD.org>
    7  * All rights reserved.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  *
   13  *    - Redistributions of source code must retain the above copyright
   14  *      notice, this list of conditions and the following disclaimer.
   15  *    - Redistributions in binary form must reproduce the above
   16  *      copyright notice, this list of conditions and the following
   17  *      disclaimer in the documentation and/or other materials provided
   18  *      with the distribution.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
   23  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
   24  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
   25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   26  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   27  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   28  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   30  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   31  * POSSIBILITY OF SUCH DAMAGE.
   32  *
   33  *      $OpenBSD: pf_if.c,v 1.54 2008/06/14 16:55:28 mk Exp $
   34  */
   35 
   36 #include <sys/cdefs.h>
   37 __FBSDID("$FreeBSD: head/sys/netpfil/pf/pf_if.c 302156 2016-06-23 21:34:38Z bz $");
   38 
   39 #include "opt_inet.h"
   40 #include "opt_inet6.h"
   41 
   42 #include <sys/param.h>
   43 #include <sys/kernel.h>
   44 #include <sys/eventhandler.h>
   45 #include <sys/lock.h>
   46 #include <sys/mbuf.h>
   47 #include <sys/rwlock.h>
   48 #include <sys/socket.h>
   49 
   50 #include <net/if.h>
   51 #include <net/if_var.h>
   52 #include <net/vnet.h>
   53 #include <net/pfvar.h>
   54 #include <net/route.h>
   55 
   56 VNET_DEFINE(struct pfi_kif *,    pfi_all);
   57 static VNET_DEFINE(long, pfi_update);
   58 #define V_pfi_update    VNET(pfi_update)
   59 #define PFI_BUFFER_MAX  0x10000
   60 
   61 VNET_DECLARE(int, pf_vnet_active);
   62 #define V_pf_vnet_active        VNET(pf_vnet_active)
   63 
   64 static VNET_DEFINE(struct pfr_addr *, pfi_buffer);
   65 static VNET_DEFINE(int, pfi_buffer_cnt);
   66 static VNET_DEFINE(int, pfi_buffer_max);
   67 #define V_pfi_buffer             VNET(pfi_buffer)
   68 #define V_pfi_buffer_cnt         VNET(pfi_buffer_cnt)
   69 #define V_pfi_buffer_max         VNET(pfi_buffer_max)
   70 
   71 eventhandler_tag         pfi_attach_cookie;
   72 eventhandler_tag         pfi_detach_cookie;
   73 eventhandler_tag         pfi_attach_group_cookie;
   74 eventhandler_tag         pfi_change_group_cookie;
   75 eventhandler_tag         pfi_detach_group_cookie;
   76 eventhandler_tag         pfi_ifaddr_event_cookie;
   77 
   78 static void      pfi_attach_ifnet(struct ifnet *);
   79 static void      pfi_attach_ifgroup(struct ifg_group *);
   80 
   81 static void      pfi_kif_update(struct pfi_kif *);
   82 static void      pfi_dynaddr_update(struct pfi_dynaddr *dyn);
   83 static void      pfi_table_update(struct pfr_ktable *, struct pfi_kif *, int,
   84                     int);
   85 static void      pfi_instance_add(struct ifnet *, int, int);
   86 static void      pfi_address_add(struct sockaddr *, int, int);
   87 static int       pfi_if_compare(struct pfi_kif *, struct pfi_kif *);
   88 static int       pfi_skip_if(const char *, struct pfi_kif *);
   89 static int       pfi_unmask(void *);
   90 static void      pfi_attach_ifnet_event(void * __unused, struct ifnet *);
   91 static void      pfi_detach_ifnet_event(void * __unused, struct ifnet *);
   92 static void      pfi_attach_group_event(void *, struct ifg_group *);
   93 static void      pfi_change_group_event(void *, char *);
   94 static void      pfi_detach_group_event(void *, struct ifg_group *);
   95 static void      pfi_ifaddr_event(void * __unused, struct ifnet *);
   96 
   97 RB_HEAD(pfi_ifhead, pfi_kif);
   98 static RB_PROTOTYPE(pfi_ifhead, pfi_kif, pfik_tree, pfi_if_compare);
   99 static RB_GENERATE(pfi_ifhead, pfi_kif, pfik_tree, pfi_if_compare);
  100 static VNET_DEFINE(struct pfi_ifhead, pfi_ifs);
  101 #define V_pfi_ifs       VNET(pfi_ifs)
  102 
  103 #define PFI_BUFFER_MAX          0x10000
  104 MALLOC_DEFINE(PFI_MTYPE, "pf_ifnet", "pf(4) interface database");
  105 
  106 LIST_HEAD(pfi_list, pfi_kif);
  107 static VNET_DEFINE(struct pfi_list, pfi_unlinked_kifs);
  108 #define V_pfi_unlinked_kifs     VNET(pfi_unlinked_kifs)
  109 static struct mtx pfi_unlnkdkifs_mtx;
  110 MTX_SYSINIT(pfi_unlnkdkifs_mtx, &pfi_unlnkdkifs_mtx, "pf unlinked interfaces",
  111     MTX_DEF);
  112 
  113 void
  114 pfi_initialize_vnet(void)
  115 {
  116         struct ifg_group *ifg;
  117         struct ifnet *ifp;
  118         struct pfi_kif *kif;
  119 
  120         V_pfi_buffer_max = 64;
  121         V_pfi_buffer = malloc(V_pfi_buffer_max * sizeof(*V_pfi_buffer),
  122             PFI_MTYPE, M_WAITOK);
  123 
  124         kif = malloc(sizeof(*kif), PFI_MTYPE, M_WAITOK);
  125         PF_RULES_WLOCK();
  126         V_pfi_all = pfi_kif_attach(kif, IFG_ALL);
  127         PF_RULES_WUNLOCK();
  128 
  129         IFNET_RLOCK();
  130         TAILQ_FOREACH(ifg, &V_ifg_head, ifg_next)
  131                 pfi_attach_ifgroup(ifg);
  132         TAILQ_FOREACH(ifp, &V_ifnet, if_link)
  133                 pfi_attach_ifnet(ifp);
  134         IFNET_RUNLOCK();
  135 }
  136 
  137 void
  138 pfi_initialize(void)
  139 {
  140 
  141         pfi_attach_cookie = EVENTHANDLER_REGISTER(ifnet_arrival_event,
  142             pfi_attach_ifnet_event, NULL, EVENTHANDLER_PRI_ANY);
  143         pfi_detach_cookie = EVENTHANDLER_REGISTER(ifnet_departure_event,
  144             pfi_detach_ifnet_event, NULL, EVENTHANDLER_PRI_ANY);
  145         pfi_attach_group_cookie = EVENTHANDLER_REGISTER(group_attach_event,
  146             pfi_attach_group_event, curvnet, EVENTHANDLER_PRI_ANY);
  147         pfi_change_group_cookie = EVENTHANDLER_REGISTER(group_change_event,
  148             pfi_change_group_event, curvnet, EVENTHANDLER_PRI_ANY);
  149         pfi_detach_group_cookie = EVENTHANDLER_REGISTER(group_detach_event,
  150             pfi_detach_group_event, curvnet, EVENTHANDLER_PRI_ANY);
  151         pfi_ifaddr_event_cookie = EVENTHANDLER_REGISTER(ifaddr_event,
  152             pfi_ifaddr_event, NULL, EVENTHANDLER_PRI_ANY);
  153 }
  154 
  155 void
  156 pfi_cleanup_vnet(void)
  157 {
  158         struct pfi_kif *kif;
  159 
  160         PF_RULES_WASSERT();
  161 
  162         V_pfi_all = NULL;
  163         while ((kif = RB_MIN(pfi_ifhead, &V_pfi_ifs))) {
  164                 RB_REMOVE(pfi_ifhead, &V_pfi_ifs, kif);
  165                 if (kif->pfik_group)
  166                         kif->pfik_group->ifg_pf_kif = NULL;
  167                 if (kif->pfik_ifp)
  168                         kif->pfik_ifp->if_pf_kif = NULL;
  169                 free(kif, PFI_MTYPE);
  170         }
  171 
  172         mtx_lock(&pfi_unlnkdkifs_mtx);
  173         while ((kif = LIST_FIRST(&V_pfi_unlinked_kifs))) {
  174                 LIST_REMOVE(kif, pfik_list);
  175                 free(kif, PFI_MTYPE);
  176         }
  177         mtx_unlock(&pfi_unlnkdkifs_mtx);
  178 
  179         free(V_pfi_buffer, PFI_MTYPE);
  180 }
  181 
  182 void
  183 pfi_cleanup(void)
  184 {
  185 
  186         EVENTHANDLER_DEREGISTER(ifnet_arrival_event, pfi_attach_cookie);
  187         EVENTHANDLER_DEREGISTER(ifnet_departure_event, pfi_detach_cookie);
  188         EVENTHANDLER_DEREGISTER(group_attach_event, pfi_attach_group_cookie);
  189         EVENTHANDLER_DEREGISTER(group_change_event, pfi_change_group_cookie);
  190         EVENTHANDLER_DEREGISTER(group_detach_event, pfi_detach_group_cookie);
  191         EVENTHANDLER_DEREGISTER(ifaddr_event, pfi_ifaddr_event_cookie);
  192 }
  193 
  194 struct pfi_kif *
  195 pfi_kif_find(const char *kif_name)
  196 {
  197         struct pfi_kif_cmp s;
  198 
  199         PF_RULES_ASSERT();
  200 
  201         bzero(&s, sizeof(s));
  202         strlcpy(s.pfik_name, kif_name, sizeof(s.pfik_name));
  203 
  204         return (RB_FIND(pfi_ifhead, &V_pfi_ifs, (struct pfi_kif *)&s));
  205 }
  206 
  207 struct pfi_kif *
  208 pfi_kif_attach(struct pfi_kif *kif, const char *kif_name)
  209 {
  210         struct pfi_kif *kif1;
  211 
  212         PF_RULES_WASSERT();
  213         KASSERT(kif != NULL, ("%s: null kif", __func__));
  214 
  215         kif1 = pfi_kif_find(kif_name);
  216         if (kif1 != NULL) {
  217                 free(kif, PFI_MTYPE);
  218                 return (kif1);
  219         }
  220 
  221         bzero(kif, sizeof(*kif));
  222         strlcpy(kif->pfik_name, kif_name, sizeof(kif->pfik_name));
  223         /*
  224          * It seems that the value of time_second is in unintialzied state
  225          * when pf sets interface statistics clear time in boot phase if pf
  226          * was statically linked to kernel. Instead of setting the bogus
  227          * time value have pfi_get_ifaces handle this case. In
  228          * pfi_get_ifaces it uses time_second if it sees the time is 0.
  229          */
  230         kif->pfik_tzero = time_second > 1 ? time_second : 0;
  231         TAILQ_INIT(&kif->pfik_dynaddrs);
  232 
  233         RB_INSERT(pfi_ifhead, &V_pfi_ifs, kif);
  234 
  235         return (kif);
  236 }
  237 
  238 void
  239 pfi_kif_ref(struct pfi_kif *kif)
  240 {
  241 
  242         PF_RULES_WASSERT();
  243         kif->pfik_rulerefs++;
  244 }
  245 
  246 void
  247 pfi_kif_unref(struct pfi_kif *kif)
  248 {
  249 
  250         PF_RULES_WASSERT();
  251         KASSERT(kif->pfik_rulerefs > 0, ("%s: %p has zero refs", __func__, kif));
  252 
  253         kif->pfik_rulerefs--;
  254 
  255         if (kif->pfik_rulerefs > 0)
  256                 return;
  257 
  258         /* kif referencing an existing ifnet or group should exist. */
  259         if (kif->pfik_ifp != NULL || kif->pfik_group != NULL || kif == V_pfi_all)
  260                 return;
  261 
  262         RB_REMOVE(pfi_ifhead, &V_pfi_ifs, kif);
  263 
  264         kif->pfik_flags |= PFI_IFLAG_REFS;
  265 
  266         mtx_lock(&pfi_unlnkdkifs_mtx);
  267         LIST_INSERT_HEAD(&V_pfi_unlinked_kifs, kif, pfik_list);
  268         mtx_unlock(&pfi_unlnkdkifs_mtx);
  269 }
  270 
  271 void
  272 pfi_kif_purge(void)
  273 {
  274         struct pfi_kif *kif, *kif1;
  275 
  276         /*
  277          * Do naive mark-and-sweep garbage collecting of old kifs.
  278          * Reference flag is raised by pf_purge_expired_states().
  279          */
  280         mtx_lock(&pfi_unlnkdkifs_mtx);
  281         LIST_FOREACH_SAFE(kif, &V_pfi_unlinked_kifs, pfik_list, kif1) {
  282                 if (!(kif->pfik_flags & PFI_IFLAG_REFS)) {
  283                         LIST_REMOVE(kif, pfik_list);
  284                         free(kif, PFI_MTYPE);
  285                 } else
  286                         kif->pfik_flags &= ~PFI_IFLAG_REFS;
  287         }
  288         mtx_unlock(&pfi_unlnkdkifs_mtx);
  289 }
  290 
  291 int
  292 pfi_kif_match(struct pfi_kif *rule_kif, struct pfi_kif *packet_kif)
  293 {
  294         struct ifg_list *p;
  295 
  296         if (rule_kif == NULL || rule_kif == packet_kif)
  297                 return (1);
  298 
  299         if (rule_kif->pfik_group != NULL)
  300                 /* XXXGL: locking? */
  301                 TAILQ_FOREACH(p, &packet_kif->pfik_ifp->if_groups, ifgl_next)
  302                         if (p->ifgl_group == rule_kif->pfik_group)
  303                                 return (1);
  304 
  305         return (0);
  306 }
  307 
  308 static void
  309 pfi_attach_ifnet(struct ifnet *ifp)
  310 {
  311         struct pfi_kif *kif;
  312 
  313         kif = malloc(sizeof(*kif), PFI_MTYPE, M_WAITOK);
  314 
  315         PF_RULES_WLOCK();
  316         V_pfi_update++;
  317         kif = pfi_kif_attach(kif, ifp->if_xname);
  318 
  319         kif->pfik_ifp = ifp;
  320         ifp->if_pf_kif = kif;
  321 
  322         pfi_kif_update(kif);
  323         PF_RULES_WUNLOCK();
  324 }
  325 
  326 static void
  327 pfi_attach_ifgroup(struct ifg_group *ifg)
  328 {
  329         struct pfi_kif *kif;
  330 
  331         kif = malloc(sizeof(*kif), PFI_MTYPE, M_WAITOK);
  332 
  333         PF_RULES_WLOCK();
  334         V_pfi_update++;
  335         kif = pfi_kif_attach(kif, ifg->ifg_group);
  336 
  337         kif->pfik_group = ifg;
  338         ifg->ifg_pf_kif = kif;
  339         PF_RULES_WUNLOCK();
  340 }
  341 
  342 int
  343 pfi_match_addr(struct pfi_dynaddr *dyn, struct pf_addr *a, sa_family_t af)
  344 {
  345         switch (af) {
  346 #ifdef INET
  347         case AF_INET:
  348                 switch (dyn->pfid_acnt4) {
  349                 case 0:
  350                         return (0);
  351                 case 1:
  352                         return (PF_MATCHA(0, &dyn->pfid_addr4,
  353                             &dyn->pfid_mask4, a, AF_INET));
  354                 default:
  355                         return (pfr_match_addr(dyn->pfid_kt, a, AF_INET));
  356                 }
  357                 break;
  358 #endif /* INET */
  359 #ifdef INET6
  360         case AF_INET6:
  361                 switch (dyn->pfid_acnt6) {
  362                 case 0:
  363                         return (0);
  364                 case 1:
  365                         return (PF_MATCHA(0, &dyn->pfid_addr6,
  366                             &dyn->pfid_mask6, a, AF_INET6));
  367                 default:
  368                         return (pfr_match_addr(dyn->pfid_kt, a, AF_INET6));
  369                 }
  370                 break;
  371 #endif /* INET6 */
  372         default:
  373                 return (0);
  374         }
  375 }
  376 
  377 int
  378 pfi_dynaddr_setup(struct pf_addr_wrap *aw, sa_family_t af)
  379 {
  380         struct pfi_dynaddr      *dyn;
  381         char                     tblname[PF_TABLE_NAME_SIZE];
  382         struct pf_ruleset       *ruleset = NULL;
  383         struct pfi_kif          *kif;
  384         int                      rv = 0;
  385 
  386         PF_RULES_WASSERT();
  387         KASSERT(aw->type == PF_ADDR_DYNIFTL, ("%s: type %u",
  388             __func__, aw->type));
  389         KASSERT(aw->p.dyn == NULL, ("%s: dyn is %p", __func__, aw->p.dyn));
  390 
  391         if ((dyn = malloc(sizeof(*dyn), PFI_MTYPE, M_NOWAIT | M_ZERO)) == NULL)
  392                 return (ENOMEM);
  393 
  394         if ((kif = malloc(sizeof(*kif), PFI_MTYPE, M_NOWAIT)) == NULL) {
  395                 free(dyn, PFI_MTYPE);
  396                 return (ENOMEM);
  397         }
  398 
  399         if (!strcmp(aw->v.ifname, "self"))
  400                 dyn->pfid_kif = pfi_kif_attach(kif, IFG_ALL);
  401         else
  402                 dyn->pfid_kif = pfi_kif_attach(kif, aw->v.ifname);
  403         pfi_kif_ref(dyn->pfid_kif);
  404 
  405         dyn->pfid_net = pfi_unmask(&aw->v.a.mask);
  406         if (af == AF_INET && dyn->pfid_net == 32)
  407                 dyn->pfid_net = 128;
  408         strlcpy(tblname, aw->v.ifname, sizeof(tblname));
  409         if (aw->iflags & PFI_AFLAG_NETWORK)
  410                 strlcat(tblname, ":network", sizeof(tblname));
  411         if (aw->iflags & PFI_AFLAG_BROADCAST)
  412                 strlcat(tblname, ":broadcast", sizeof(tblname));
  413         if (aw->iflags & PFI_AFLAG_PEER)
  414                 strlcat(tblname, ":peer", sizeof(tblname));
  415         if (aw->iflags & PFI_AFLAG_NOALIAS)
  416                 strlcat(tblname, ":0", sizeof(tblname));
  417         if (dyn->pfid_net != 128)
  418                 snprintf(tblname + strlen(tblname),
  419                     sizeof(tblname) - strlen(tblname), "/%d", dyn->pfid_net);
  420         if ((ruleset = pf_find_or_create_ruleset(PF_RESERVED_ANCHOR)) == NULL) {
  421                 rv = ENOMEM;
  422                 goto _bad;
  423         }
  424 
  425         if ((dyn->pfid_kt = pfr_attach_table(ruleset, tblname)) == NULL) {
  426                 rv = ENOMEM;
  427                 goto _bad;
  428         }
  429 
  430         dyn->pfid_kt->pfrkt_flags |= PFR_TFLAG_ACTIVE;
  431         dyn->pfid_iflags = aw->iflags;
  432         dyn->pfid_af = af;
  433 
  434         TAILQ_INSERT_TAIL(&dyn->pfid_kif->pfik_dynaddrs, dyn, entry);
  435         aw->p.dyn = dyn;
  436         pfi_kif_update(dyn->pfid_kif);
  437 
  438         return (0);
  439 
  440 _bad:
  441         if (dyn->pfid_kt != NULL)
  442                 pfr_detach_table(dyn->pfid_kt);
  443         if (ruleset != NULL)
  444                 pf_remove_if_empty_ruleset(ruleset);
  445         if (dyn->pfid_kif != NULL)
  446                 pfi_kif_unref(dyn->pfid_kif);
  447         free(dyn, PFI_MTYPE);
  448 
  449         return (rv);
  450 }
  451 
  452 static void
  453 pfi_kif_update(struct pfi_kif *kif)
  454 {
  455         struct ifg_list         *ifgl;
  456         struct pfi_dynaddr      *p;
  457 
  458         PF_RULES_WASSERT();
  459 
  460         /* update all dynaddr */
  461         TAILQ_FOREACH(p, &kif->pfik_dynaddrs, entry)
  462                 pfi_dynaddr_update(p);
  463 
  464         /* again for all groups kif is member of */
  465         if (kif->pfik_ifp != NULL) {
  466                 IF_ADDR_RLOCK(kif->pfik_ifp);
  467                 TAILQ_FOREACH(ifgl, &kif->pfik_ifp->if_groups, ifgl_next)
  468                         pfi_kif_update((struct pfi_kif *)
  469                             ifgl->ifgl_group->ifg_pf_kif);
  470                 IF_ADDR_RUNLOCK(kif->pfik_ifp);
  471         }
  472 }
  473 
  474 static void
  475 pfi_dynaddr_update(struct pfi_dynaddr *dyn)
  476 {
  477         struct pfi_kif          *kif;
  478         struct pfr_ktable       *kt;
  479 
  480         PF_RULES_WASSERT();
  481         KASSERT(dyn && dyn->pfid_kif && dyn->pfid_kt,
  482             ("%s: bad argument", __func__));
  483 
  484         kif = dyn->pfid_kif;
  485         kt = dyn->pfid_kt;
  486 
  487         if (kt->pfrkt_larg != V_pfi_update) {
  488                 /* this table needs to be brought up-to-date */
  489                 pfi_table_update(kt, kif, dyn->pfid_net, dyn->pfid_iflags);
  490                 kt->pfrkt_larg = V_pfi_update;
  491         }
  492         pfr_dynaddr_update(kt, dyn);
  493 }
  494 
  495 static void
  496 pfi_table_update(struct pfr_ktable *kt, struct pfi_kif *kif, int net, int flags)
  497 {
  498         int                      e, size2 = 0;
  499         struct ifg_member       *ifgm;
  500 
  501         V_pfi_buffer_cnt = 0;
  502 
  503         if (kif->pfik_ifp != NULL)
  504                 pfi_instance_add(kif->pfik_ifp, net, flags);
  505         else if (kif->pfik_group != NULL) {
  506                 IFNET_RLOCK_NOSLEEP();
  507                 TAILQ_FOREACH(ifgm, &kif->pfik_group->ifg_members, ifgm_next)
  508                         pfi_instance_add(ifgm->ifgm_ifp, net, flags);
  509                 IFNET_RUNLOCK_NOSLEEP();
  510         }
  511 
  512         if ((e = pfr_set_addrs(&kt->pfrkt_t, V_pfi_buffer, V_pfi_buffer_cnt, &size2,
  513             NULL, NULL, NULL, 0, PFR_TFLAG_ALLMASK)))
  514                 printf("%s: cannot set %d new addresses into table %s: %d\n",
  515                     __func__, V_pfi_buffer_cnt, kt->pfrkt_name, e);
  516 }
  517 
  518 static void
  519 pfi_instance_add(struct ifnet *ifp, int net, int flags)
  520 {
  521         struct ifaddr   *ia;
  522         int              got4 = 0, got6 = 0;
  523         int              net2, af;
  524 
  525         IF_ADDR_RLOCK(ifp);
  526         TAILQ_FOREACH(ia, &ifp->if_addrhead, ifa_list) {
  527                 if (ia->ifa_addr == NULL)
  528                         continue;
  529                 af = ia->ifa_addr->sa_family;
  530                 if (af != AF_INET && af != AF_INET6)
  531                         continue;
  532                 /*
  533                  * XXX: For point-to-point interfaces, (ifname:0) and IPv4,
  534                  *      jump over addresses without a proper route to work
  535                  *      around a problem with ppp not fully removing the
  536                  *      address used during IPCP.
  537                  */
  538                 if ((ifp->if_flags & IFF_POINTOPOINT) &&
  539                     !(ia->ifa_flags & IFA_ROUTE) &&
  540                     (flags & PFI_AFLAG_NOALIAS) && (af == AF_INET))
  541                         continue;
  542                 if ((flags & PFI_AFLAG_BROADCAST) && af == AF_INET6)
  543                         continue;
  544                 if ((flags & PFI_AFLAG_BROADCAST) &&
  545                     !(ifp->if_flags & IFF_BROADCAST))
  546                         continue;
  547                 if ((flags & PFI_AFLAG_PEER) &&
  548                     !(ifp->if_flags & IFF_POINTOPOINT))
  549                         continue;
  550                 if ((flags & PFI_AFLAG_NETWORK) && af == AF_INET6 &&
  551                     IN6_IS_ADDR_LINKLOCAL(
  552                     &((struct sockaddr_in6 *)ia->ifa_addr)->sin6_addr))
  553                         continue;
  554                 if (flags & PFI_AFLAG_NOALIAS) {
  555                         if (af == AF_INET && got4)
  556                                 continue;
  557                         if (af == AF_INET6 && got6)
  558                                 continue;
  559                 }
  560                 if (af == AF_INET)
  561                         got4 = 1;
  562                 else if (af == AF_INET6)
  563                         got6 = 1;
  564                 net2 = net;
  565                 if (net2 == 128 && (flags & PFI_AFLAG_NETWORK)) {
  566                         if (af == AF_INET)
  567                                 net2 = pfi_unmask(&((struct sockaddr_in *)
  568                                     ia->ifa_netmask)->sin_addr);
  569                         else if (af == AF_INET6)
  570                                 net2 = pfi_unmask(&((struct sockaddr_in6 *)
  571                                     ia->ifa_netmask)->sin6_addr);
  572                 }
  573                 if (af == AF_INET && net2 > 32)
  574                         net2 = 32;
  575                 if (flags & PFI_AFLAG_BROADCAST)
  576                         pfi_address_add(ia->ifa_broadaddr, af, net2);
  577                 else if (flags & PFI_AFLAG_PEER)
  578                         pfi_address_add(ia->ifa_dstaddr, af, net2);
  579                 else
  580                         pfi_address_add(ia->ifa_addr, af, net2);
  581         }
  582         IF_ADDR_RUNLOCK(ifp);
  583 }
  584 
  585 static void
  586 pfi_address_add(struct sockaddr *sa, int af, int net)
  587 {
  588         struct pfr_addr *p;
  589         int              i;
  590 
  591         if (V_pfi_buffer_cnt >= V_pfi_buffer_max) {
  592                 int              new_max = V_pfi_buffer_max * 2;
  593 
  594                 if (new_max > PFI_BUFFER_MAX) {
  595                         printf("%s: address buffer full (%d/%d)\n", __func__,
  596                             V_pfi_buffer_cnt, PFI_BUFFER_MAX);
  597                         return;
  598                 }
  599                 p = malloc(new_max * sizeof(*V_pfi_buffer), PFI_MTYPE,
  600                     M_NOWAIT);
  601                 if (p == NULL) {
  602                         printf("%s: no memory to grow buffer (%d/%d)\n",
  603                             __func__, V_pfi_buffer_cnt, PFI_BUFFER_MAX);
  604                         return;
  605                 }
  606                 memcpy(p, V_pfi_buffer, V_pfi_buffer_max * sizeof(*V_pfi_buffer));
  607                 /* no need to zero buffer */
  608                 free(V_pfi_buffer, PFI_MTYPE);
  609                 V_pfi_buffer = p;
  610                 V_pfi_buffer_max = new_max;
  611         }
  612         if (af == AF_INET && net > 32)
  613                 net = 128;
  614         p = V_pfi_buffer + V_pfi_buffer_cnt++;
  615         bzero(p, sizeof(*p));
  616         p->pfra_af = af;
  617         p->pfra_net = net;
  618         if (af == AF_INET)
  619                 p->pfra_ip4addr = ((struct sockaddr_in *)sa)->sin_addr;
  620         else if (af == AF_INET6) {
  621                 p->pfra_ip6addr = ((struct sockaddr_in6 *)sa)->sin6_addr;
  622                 if (IN6_IS_SCOPE_EMBED(&p->pfra_ip6addr))
  623                         p->pfra_ip6addr.s6_addr16[1] = 0;
  624         }
  625         /* mask network address bits */
  626         if (net < 128)
  627                 ((caddr_t)p)[p->pfra_net/8] &= ~(0xFF >> (p->pfra_net%8));
  628         for (i = (p->pfra_net+7)/8; i < sizeof(p->pfra_u); i++)
  629                 ((caddr_t)p)[i] = 0;
  630 }
  631 
  632 void
  633 pfi_dynaddr_remove(struct pfi_dynaddr *dyn)
  634 {
  635 
  636         KASSERT(dyn->pfid_kif != NULL, ("%s: null pfid_kif", __func__));
  637         KASSERT(dyn->pfid_kt != NULL, ("%s: null pfid_kt", __func__));
  638 
  639         TAILQ_REMOVE(&dyn->pfid_kif->pfik_dynaddrs, dyn, entry);
  640         pfi_kif_unref(dyn->pfid_kif);
  641         pfr_detach_table(dyn->pfid_kt);
  642         free(dyn, PFI_MTYPE);
  643 }
  644 
  645 void
  646 pfi_dynaddr_copyout(struct pf_addr_wrap *aw)
  647 {
  648 
  649         KASSERT(aw->type == PF_ADDR_DYNIFTL,
  650             ("%s: type %u", __func__, aw->type));
  651 
  652         if (aw->p.dyn == NULL || aw->p.dyn->pfid_kif == NULL)
  653                 return;
  654         aw->p.dyncnt = aw->p.dyn->pfid_acnt4 + aw->p.dyn->pfid_acnt6;
  655 }
  656 
  657 static int
  658 pfi_if_compare(struct pfi_kif *p, struct pfi_kif *q)
  659 {
  660         return (strncmp(p->pfik_name, q->pfik_name, IFNAMSIZ));
  661 }
  662 
  663 void
  664 pfi_update_status(const char *name, struct pf_status *pfs)
  665 {
  666         struct pfi_kif          *p;
  667         struct pfi_kif_cmp       key;
  668         struct ifg_member        p_member, *ifgm;
  669         TAILQ_HEAD(, ifg_member) ifg_members;
  670         int                      i, j, k;
  671 
  672         strlcpy(key.pfik_name, name, sizeof(key.pfik_name));
  673         p = RB_FIND(pfi_ifhead, &V_pfi_ifs, (struct pfi_kif *)&key);
  674         if (p == NULL)
  675                 return;
  676 
  677         if (p->pfik_group != NULL) {
  678                 bcopy(&p->pfik_group->ifg_members, &ifg_members,
  679                     sizeof(ifg_members));
  680         } else {
  681                 /* build a temporary list for p only */
  682                 bzero(&p_member, sizeof(p_member));
  683                 p_member.ifgm_ifp = p->pfik_ifp;
  684                 TAILQ_INIT(&ifg_members);
  685                 TAILQ_INSERT_TAIL(&ifg_members, &p_member, ifgm_next);
  686         }
  687         if (pfs) {
  688                 bzero(pfs->pcounters, sizeof(pfs->pcounters));
  689                 bzero(pfs->bcounters, sizeof(pfs->bcounters));
  690         }
  691         TAILQ_FOREACH(ifgm, &ifg_members, ifgm_next) {
  692                 if (ifgm->ifgm_ifp == NULL || ifgm->ifgm_ifp->if_pf_kif == NULL)
  693                         continue;
  694                 p = (struct pfi_kif *)ifgm->ifgm_ifp->if_pf_kif;
  695 
  696                 /* just clear statistics */
  697                 if (pfs == NULL) {
  698                         bzero(p->pfik_packets, sizeof(p->pfik_packets));
  699                         bzero(p->pfik_bytes, sizeof(p->pfik_bytes));
  700                         p->pfik_tzero = time_second;
  701                         continue;
  702                 }
  703                 for (i = 0; i < 2; i++)
  704                         for (j = 0; j < 2; j++)
  705                                 for (k = 0; k < 2; k++) {
  706                                         pfs->pcounters[i][j][k] +=
  707                                                 p->pfik_packets[i][j][k];
  708                                         pfs->bcounters[i][j] +=
  709                                                 p->pfik_bytes[i][j][k];
  710                                 }
  711         }
  712 }
  713 
  714 void
  715 pfi_get_ifaces(const char *name, struct pfi_kif *buf, int *size)
  716 {
  717         struct pfi_kif  *p, *nextp;
  718         int              n = 0;
  719 
  720         for (p = RB_MIN(pfi_ifhead, &V_pfi_ifs); p; p = nextp) {
  721                 nextp = RB_NEXT(pfi_ifhead, &V_pfi_ifs, p);
  722                 if (pfi_skip_if(name, p))
  723                         continue;
  724                 if (*size <= n++)
  725                         break;
  726                 if (!p->pfik_tzero)
  727                         p->pfik_tzero = time_second;
  728                 bcopy(p, buf++, sizeof(*buf));
  729                 nextp = RB_NEXT(pfi_ifhead, &V_pfi_ifs, p);
  730         }
  731         *size = n;
  732 }
  733 
  734 static int
  735 pfi_skip_if(const char *filter, struct pfi_kif *p)
  736 {
  737         int     n;
  738 
  739         if (filter == NULL || !*filter)
  740                 return (0);
  741         if (!strcmp(p->pfik_name, filter))
  742                 return (0);     /* exact match */
  743         n = strlen(filter);
  744         if (n < 1 || n >= IFNAMSIZ)
  745                 return (1);     /* sanity check */
  746         if (filter[n-1] >= '' && filter[n-1] <= '9')
  747                 return (1);     /* only do exact match in that case */
  748         if (strncmp(p->pfik_name, filter, n))
  749                 return (1);     /* prefix doesn't match */
  750         return (p->pfik_name[n] < '' || p->pfik_name[n] > '9');
  751 }
  752 
  753 int
  754 pfi_set_flags(const char *name, int flags)
  755 {
  756         struct pfi_kif  *p;
  757 
  758         RB_FOREACH(p, pfi_ifhead, &V_pfi_ifs) {
  759                 if (pfi_skip_if(name, p))
  760                         continue;
  761                 p->pfik_flags |= flags;
  762         }
  763         return (0);
  764 }
  765 
  766 int
  767 pfi_clear_flags(const char *name, int flags)
  768 {
  769         struct pfi_kif  *p;
  770 
  771         RB_FOREACH(p, pfi_ifhead, &V_pfi_ifs) {
  772                 if (pfi_skip_if(name, p))
  773                         continue;
  774                 p->pfik_flags &= ~flags;
  775         }
  776         return (0);
  777 }
  778 
  779 /* from pf_print_state.c */
  780 static int
  781 pfi_unmask(void *addr)
  782 {
  783         struct pf_addr *m = addr;
  784         int i = 31, j = 0, b = 0;
  785         u_int32_t tmp;
  786 
  787         while (j < 4 && m->addr32[j] == 0xffffffff) {
  788                 b += 32;
  789                 j++;
  790         }
  791         if (j < 4) {
  792                 tmp = ntohl(m->addr32[j]);
  793                 for (i = 31; tmp & (1 << i); --i)
  794                         b++;
  795         }
  796         return (b);
  797 }
  798 
  799 static void
  800 pfi_attach_ifnet_event(void *arg __unused, struct ifnet *ifp)
  801 {
  802 
  803         CURVNET_SET(ifp->if_vnet);
  804         if (V_pf_vnet_active == 0) {
  805                 /* Avoid teardown race in the least expensive way. */
  806                 CURVNET_RESTORE();
  807                 return;
  808         }
  809         pfi_attach_ifnet(ifp);
  810 #ifdef ALTQ
  811         PF_RULES_WLOCK();
  812         pf_altq_ifnet_event(ifp, 0);
  813         PF_RULES_WUNLOCK();
  814 #endif
  815         CURVNET_RESTORE();
  816 }
  817 
  818 static void
  819 pfi_detach_ifnet_event(void *arg __unused, struct ifnet *ifp)
  820 {
  821         struct pfi_kif *kif = (struct pfi_kif *)ifp->if_pf_kif;
  822 
  823         if (kif == NULL)
  824                 return;
  825 
  826         CURVNET_SET(ifp->if_vnet);
  827         if (V_pf_vnet_active == 0) {
  828                 /* Avoid teardown race in the least expensive way. */
  829                 CURVNET_RESTORE();
  830                 return;
  831         }
  832         PF_RULES_WLOCK();
  833         V_pfi_update++;
  834         pfi_kif_update(kif);
  835 
  836         kif->pfik_ifp = NULL;
  837         ifp->if_pf_kif = NULL;
  838 #ifdef ALTQ
  839         pf_altq_ifnet_event(ifp, 1);
  840 #endif
  841         PF_RULES_WUNLOCK();
  842         CURVNET_RESTORE();
  843 }
  844 
  845 static void
  846 pfi_attach_group_event(void *arg , struct ifg_group *ifg)
  847 {
  848 
  849         CURVNET_SET((struct vnet *)arg);
  850         if (V_pf_vnet_active == 0) {
  851                 /* Avoid teardown race in the least expensive way. */
  852                 CURVNET_RESTORE();
  853                 return;
  854         }
  855         pfi_attach_ifgroup(ifg);
  856         CURVNET_RESTORE();
  857 }
  858 
  859 static void
  860 pfi_change_group_event(void *arg, char *gname)
  861 {
  862         struct pfi_kif *kif;
  863 
  864         CURVNET_SET((struct vnet *)arg);
  865         if (V_pf_vnet_active == 0) {
  866                 /* Avoid teardown race in the least expensive way. */
  867                 CURVNET_RESTORE();
  868                 return;
  869         }
  870 
  871         kif = malloc(sizeof(*kif), PFI_MTYPE, M_WAITOK);
  872         PF_RULES_WLOCK();
  873         V_pfi_update++;
  874         kif = pfi_kif_attach(kif, gname);
  875         pfi_kif_update(kif);
  876         PF_RULES_WUNLOCK();
  877         CURVNET_RESTORE();
  878 }
  879 
  880 static void
  881 pfi_detach_group_event(void *arg, struct ifg_group *ifg)
  882 {
  883         struct pfi_kif *kif = (struct pfi_kif *)ifg->ifg_pf_kif;
  884 
  885         if (kif == NULL)
  886                 return;
  887 
  888         CURVNET_SET((struct vnet *)arg);
  889         if (V_pf_vnet_active == 0) {
  890                 /* Avoid teardown race in the least expensive way. */
  891                 CURVNET_RESTORE();
  892                 return;
  893         }
  894         PF_RULES_WLOCK();
  895         V_pfi_update++;
  896 
  897         kif->pfik_group = NULL;
  898         ifg->ifg_pf_kif = NULL;
  899         PF_RULES_WUNLOCK();
  900         CURVNET_RESTORE();
  901 }
  902 
  903 static void
  904 pfi_ifaddr_event(void *arg __unused, struct ifnet *ifp)
  905 {
  906         if (ifp->if_pf_kif == NULL)
  907                 return;
  908 
  909         CURVNET_SET(ifp->if_vnet);
  910         if (V_pf_vnet_active == 0) {
  911                 /* Avoid teardown race in the least expensive way. */
  912                 CURVNET_RESTORE();
  913                 return;
  914         }
  915         PF_RULES_WLOCK();
  916         if (ifp && ifp->if_pf_kif) {
  917                 V_pfi_update++;
  918                 pfi_kif_update(ifp->if_pf_kif);
  919         }
  920         PF_RULES_WUNLOCK();
  921         CURVNET_RESTORE();
  922 }

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