The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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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/10.1/sys/net/if_llatbl.h 254963 2013-08-27 16:45:00Z alfred $");
   29 
   30 #ifndef _NET_IF_LLATBL_H_
   31 #define _NET_IF_LLATBL_H_
   32 
   33 #include <sys/_rwlock.h>
   34 #include <netinet/in.h>
   35 
   36 struct ifnet;
   37 struct sysctl_req;
   38 struct rt_msghdr;
   39 struct rt_addrinfo;
   40 
   41 struct llentry;
   42 LIST_HEAD(llentries, llentry);
   43 
   44 extern struct rwlock lltable_rwlock;
   45 #define LLTABLE_RLOCK()         rw_rlock(&lltable_rwlock)
   46 #define LLTABLE_RUNLOCK()       rw_runlock(&lltable_rwlock)
   47 #define LLTABLE_WLOCK()         rw_wlock(&lltable_rwlock)
   48 #define LLTABLE_WUNLOCK()       rw_wunlock(&lltable_rwlock)
   49 #define LLTABLE_LOCK_ASSERT()   rw_assert(&lltable_rwlock, RA_LOCKED)
   50 
   51 /*
   52  * Code referencing llentry must at least hold
   53  * a shared lock
   54  */
   55 struct llentry {
   56         LIST_ENTRY(llentry)      lle_next;
   57         struct rwlock            lle_lock;
   58         struct lltable           *lle_tbl;
   59         struct llentries         *lle_head;
   60         void                    (*lle_free)(struct lltable *, struct llentry *);
   61         struct mbuf              *la_hold;
   62         int                      la_numheld;  /* # of packets currently held */
   63         time_t                   la_expire;
   64         uint16_t                 la_flags;
   65         uint16_t                 la_asked;
   66         uint16_t                 la_preempt;
   67         uint16_t                 ln_byhint;
   68         int16_t                  ln_state;      /* IPv6 has ND6_LLINFO_NOSTATE == -2 */
   69         uint16_t                 ln_router;
   70         time_t                   ln_ntick;
   71         int                      lle_refcnt;
   72 
   73         union {
   74                 uint64_t        mac_aligned;
   75                 uint16_t        mac16[3];
   76                 uint8_t         mac8[20];       /* IB needs 20 bytes. */
   77         } ll_addr;
   78 
   79         /* XXX af-private? */
   80         union {
   81                 struct callout  ln_timer_ch;
   82                 struct callout  la_timer;
   83         } lle_timer;
   84         /* NB: struct sockaddr must immediately follow */
   85 };
   86 
   87 #define LLE_WLOCK(lle)          rw_wlock(&(lle)->lle_lock)
   88 #define LLE_RLOCK(lle)          rw_rlock(&(lle)->lle_lock)
   89 #define LLE_WUNLOCK(lle)        rw_wunlock(&(lle)->lle_lock)
   90 #define LLE_RUNLOCK(lle)        rw_runlock(&(lle)->lle_lock)
   91 #define LLE_DOWNGRADE(lle)      rw_downgrade(&(lle)->lle_lock)
   92 #define LLE_TRY_UPGRADE(lle)    rw_try_upgrade(&(lle)->lle_lock)
   93 #define LLE_LOCK_INIT(lle)      rw_init_flags(&(lle)->lle_lock, "lle", RW_DUPOK)
   94 #define LLE_LOCK_DESTROY(lle)   rw_destroy(&(lle)->lle_lock)
   95 #define LLE_WLOCK_ASSERT(lle)   rw_assert(&(lle)->lle_lock, RA_WLOCKED)
   96 
   97 #define LLE_IS_VALID(lle)       (((lle) != NULL) && ((lle) != (void *)-1))
   98 
   99 #define LLE_ADDREF(lle) do {                                    \
  100         LLE_WLOCK_ASSERT(lle);                                  \
  101         KASSERT((lle)->lle_refcnt >= 0,                         \
  102             ("negative refcnt %d on lle %p",                    \
  103             (lle)->lle_refcnt, (lle)));                         \
  104         (lle)->lle_refcnt++;                                    \
  105 } while (0)
  106 
  107 #define LLE_REMREF(lle) do {                                    \
  108         LLE_WLOCK_ASSERT(lle);                                  \
  109         KASSERT((lle)->lle_refcnt > 0,                          \
  110             ("bogus refcnt %d on lle %p",                       \
  111             (lle)->lle_refcnt, (lle)));                         \
  112         (lle)->lle_refcnt--;                                    \
  113 } while (0)
  114 
  115 #define LLE_FREE_LOCKED(lle) do {                               \
  116         if ((lle)->lle_refcnt == 1)                             \
  117                 (lle)->lle_free((lle)->lle_tbl, (lle));         \
  118         else {                                                  \
  119                 LLE_REMREF(lle);                                \
  120                 LLE_WUNLOCK(lle);                               \
  121         }                                                       \
  122         /* guard against invalid refs */                        \
  123         (lle) = NULL;                                           \
  124 } while (0)
  125 
  126 #define LLE_FREE(lle) do {                                      \
  127         LLE_WLOCK(lle);                                         \
  128         LLE_FREE_LOCKED(lle);                                   \
  129 } while (0)
  130 
  131 
  132 #define ln_timer_ch     lle_timer.ln_timer_ch
  133 #define la_timer        lle_timer.la_timer
  134 
  135 /* XXX bad name */
  136 #define L3_ADDR(lle)    ((struct sockaddr *)(&lle[1]))
  137 #define L3_ADDR_LEN(lle)        (((struct sockaddr *)(&lle[1]))->sa_len)
  138 
  139 #ifndef LLTBL_HASHTBL_SIZE
  140 #define LLTBL_HASHTBL_SIZE      32      /* default 32 ? */
  141 #endif
  142 
  143 #ifndef LLTBL_HASHMASK
  144 #define LLTBL_HASHMASK  (LLTBL_HASHTBL_SIZE - 1)
  145 #endif
  146 
  147 struct lltable {
  148         SLIST_ENTRY(lltable)    llt_link;
  149         struct llentries        lle_head[LLTBL_HASHTBL_SIZE];
  150         int                     llt_af;
  151         struct ifnet            *llt_ifp;
  152 
  153         void                    (*llt_prefix_free)(struct lltable *,
  154                                     const struct sockaddr *prefix,
  155                                     const struct sockaddr *mask,
  156                                     u_int flags);
  157         struct llentry *        (*llt_lookup)(struct lltable *, u_int flags,
  158                                     const struct sockaddr *l3addr);
  159         int                     (*llt_dump)(struct lltable *,
  160                                     struct sysctl_req *);
  161 };
  162 MALLOC_DECLARE(M_LLTABLE);
  163 
  164 /*
  165  * flags to be passed to arplookup.
  166  */
  167 #define LLE_DELETED     0x0001  /* entry must be deleted */
  168 #define LLE_STATIC      0x0002  /* entry is static */
  169 #define LLE_IFADDR      0x0004  /* entry is interface addr */
  170 #define LLE_VALID       0x0008  /* ll_addr is valid */
  171 #define LLE_PUB         0x0020  /* publish entry ??? */
  172 #define LLE_LINKED      0x0040  /* linked to lookup structure */
  173 #define LLE_EXCLUSIVE   0x2000  /* return lle xlocked  */
  174 #define LLE_DELETE      0x4000  /* delete on a lookup - match LLE_IFADDR */
  175 #define LLE_CREATE      0x8000  /* create on a lookup miss */
  176 
  177 #define LLATBL_HASH(key, mask) \
  178         (((((((key >> 8) ^ key) >> 8) ^ key) >> 8) ^ key) & mask)
  179 
  180 struct lltable *lltable_init(struct ifnet *, int);
  181 void            lltable_free(struct lltable *);
  182 void            lltable_prefix_free(int, struct sockaddr *,
  183                     struct sockaddr *, u_int);
  184 #if 0
  185 void            lltable_drain(int);
  186 #endif
  187 int             lltable_sysctl_dumparp(int, struct sysctl_req *);
  188 
  189 size_t          llentry_free(struct llentry *);
  190 struct llentry  *llentry_alloc(struct ifnet *, struct lltable *,
  191                     struct sockaddr_storage *);
  192 
  193 /*
  194  * Generic link layer address lookup function.
  195  */
  196 static __inline struct llentry *
  197 lla_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
  198 {
  199         return llt->llt_lookup(llt, flags, l3addr);
  200 }
  201 
  202 int             lla_rt_output(struct rt_msghdr *, struct rt_addrinfo *);
  203 
  204 #include <sys/eventhandler.h>
  205 enum {
  206         LLENTRY_RESOLVED,
  207         LLENTRY_TIMEDOUT,
  208         LLENTRY_DELETED,
  209         LLENTRY_EXPIRED,
  210 };
  211 typedef void (*lle_event_fn)(void *, struct llentry *, int);
  212 EVENTHANDLER_DECLARE(lle_event, lle_event_fn);
  213 #endif  /* _NET_IF_LLATBL_H_ */

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