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/9.1/sys/net/if_llatbl.h 225698 2011-09-20 20:27:26Z kmacy $");
   29 
   30 #ifndef _NET_IF_LLATBL_H_
   31 #define _NET_IF_LLATBL_H_
   32 
   33 #include "opt_ofed.h"
   34 
   35 #include <sys/_rwlock.h>
   36 #include <netinet/in.h>
   37 
   38 struct ifnet;
   39 struct sysctl_req;
   40 struct rt_msghdr;
   41 struct rt_addrinfo;
   42 
   43 struct llentry;
   44 LIST_HEAD(llentries, llentry);
   45 
   46 extern struct rwlock lltable_rwlock;
   47 #define LLTABLE_RLOCK()         rw_rlock(&lltable_rwlock)
   48 #define LLTABLE_RUNLOCK()       rw_runlock(&lltable_rwlock)
   49 #define LLTABLE_WLOCK()         rw_wlock(&lltable_rwlock)
   50 #define LLTABLE_WUNLOCK()       rw_wunlock(&lltable_rwlock)
   51 #define LLTABLE_LOCK_ASSERT()   rw_assert(&lltable_rwlock, RA_LOCKED)
   52 
   53 /*
   54  * Code referencing llentry must at least hold
   55  * a shared lock
   56  */
   57 struct llentry {
   58         LIST_ENTRY(llentry)      lle_next;
   59         struct rwlock            lle_lock;
   60         struct lltable           *lle_tbl;
   61         struct llentries         *lle_head;
   62         void                    (*lle_free)(struct lltable *, struct llentry *);
   63         struct mbuf              *la_hold;
   64         int                      la_numheld;  /* # of packets currently held */
   65         time_t                   la_expire;
   66         uint16_t                 la_flags;    
   67         uint16_t                 la_asked;
   68         uint16_t                 la_preempt;
   69         uint16_t                 ln_byhint;
   70         int16_t                  ln_state;      /* IPv6 has ND6_LLINFO_NOSTATE == -2 */
   71         uint16_t                 ln_router; 
   72         time_t                   ln_ntick;
   73         int                      lle_refcnt;
   74                                  
   75         union {
   76                 uint64_t        mac_aligned;
   77                 uint16_t        mac16[3];
   78 #ifdef OFED
   79                 uint8_t         mac8[20];       /* IB needs 20 bytes. */
   80 #endif
   81         } ll_addr;
   82 
   83         /* XXX af-private? */
   84         union {
   85                 struct callout  ln_timer_ch;
   86                 struct callout  la_timer;
   87         } lle_timer;
   88         /* NB: struct sockaddr must immediately follow */
   89 };
   90 
   91 #define LLE_WLOCK(lle)          rw_wlock(&(lle)->lle_lock)
   92 #define LLE_RLOCK(lle)          rw_rlock(&(lle)->lle_lock)
   93 #define LLE_WUNLOCK(lle)        rw_wunlock(&(lle)->lle_lock)
   94 #define LLE_RUNLOCK(lle)        rw_runlock(&(lle)->lle_lock)
   95 #define LLE_DOWNGRADE(lle)      rw_downgrade(&(lle)->lle_lock)
   96 #define LLE_TRY_UPGRADE(lle)    rw_try_upgrade(&(lle)->lle_lock)
   97 #define LLE_LOCK_INIT(lle)      rw_init_flags(&(lle)->lle_lock, "lle", RW_DUPOK)
   98 #define LLE_LOCK_DESTROY(lle)   rw_destroy(&(lle)->lle_lock)
   99 #define LLE_WLOCK_ASSERT(lle)   rw_assert(&(lle)->lle_lock, RA_WLOCKED)
  100 
  101 #define LLE_IS_VALID(lle)       (((lle) != NULL) && ((lle) != (void *)-1))
  102 
  103 #define LLE_ADDREF(lle) do {                                    \
  104         LLE_WLOCK_ASSERT(lle);                                  \
  105         KASSERT((lle)->lle_refcnt >= 0,                         \
  106                 ("negative refcnt %d", (lle)->lle_refcnt));     \
  107         (lle)->lle_refcnt++;                                    \
  108 } while (0)
  109 
  110 #define LLE_REMREF(lle) do {                                    \
  111         LLE_WLOCK_ASSERT(lle);                                  \
  112         KASSERT((lle)->lle_refcnt > 1,                          \
  113                 ("bogus refcnt %d", (lle)->lle_refcnt));        \
  114         (lle)->lle_refcnt--;                                    \
  115 } while (0)
  116 
  117 #define LLE_FREE_LOCKED(lle) do {                               \
  118         if ((lle)->lle_refcnt <= 1)                             \
  119                 (lle)->lle_tbl->llt_free((lle)->lle_tbl, (lle));\
  120         else {                                                  \
  121                 (lle)->lle_refcnt--;                            \
  122                 LLE_WUNLOCK(lle);                               \
  123         }                                                       \
  124         /* guard against invalid refs */                        \
  125         lle = NULL;                                             \
  126 } while (0)
  127 
  128 #define LLE_FREE(lle) do {                                      \
  129         LLE_WLOCK(lle);                                         \
  130         LLE_FREE_LOCKED(lle);                                   \
  131 } while (0)
  132 
  133 
  134 #define ln_timer_ch     lle_timer.ln_timer_ch
  135 #define la_timer        lle_timer.la_timer
  136 
  137 /* XXX bad name */
  138 #define L3_ADDR(lle)    ((struct sockaddr *)(&lle[1]))
  139 #define L3_ADDR_LEN(lle)        (((struct sockaddr *)(&lle[1]))->sa_len)
  140 
  141 #ifndef LLTBL_HASHTBL_SIZE
  142 #define LLTBL_HASHTBL_SIZE      32      /* default 32 ? */
  143 #endif
  144 
  145 #ifndef LLTBL_HASHMASK
  146 #define LLTBL_HASHMASK  (LLTBL_HASHTBL_SIZE - 1)
  147 #endif
  148 
  149 struct lltable {
  150         SLIST_ENTRY(lltable)    llt_link;
  151         struct llentries        lle_head[LLTBL_HASHTBL_SIZE];
  152         int                     llt_af;
  153         struct ifnet            *llt_ifp;
  154 
  155         void                    (*llt_free)(struct lltable *, struct llentry *);
  156         void                    (*llt_prefix_free)(struct lltable *,
  157                                     const struct sockaddr *prefix,
  158                                     const struct sockaddr *mask,
  159                                     u_int flags);
  160         struct llentry *        (*llt_lookup)(struct lltable *, u_int flags,
  161                                     const struct sockaddr *l3addr);
  162         int                     (*llt_dump)(struct lltable *,
  163                                      struct sysctl_req *);
  164 };
  165 MALLOC_DECLARE(M_LLTABLE);
  166 
  167 /*
  168  * flags to be passed to arplookup.
  169  */
  170 #define LLE_DELETED     0x0001  /* entry must be deleted */
  171 #define LLE_STATIC      0x0002  /* entry is static */
  172 #define LLE_IFADDR      0x0004  /* entry is interface addr */
  173 #define LLE_VALID       0x0008  /* ll_addr is valid */
  174 #define LLE_PROXY       0x0010  /* proxy entry ??? */
  175 #define LLE_PUB         0x0020  /* publish entry ??? */
  176 #define LLE_DELETE      0x4000  /* delete on a lookup - match LLE_IFADDR */
  177 #define LLE_CREATE      0x8000  /* create on a lookup miss */
  178 #define LLE_EXCLUSIVE   0x2000  /* return lle xlocked  */
  179 
  180 #define LLATBL_HASH(key, mask) \
  181         (((((((key >> 8) ^ key) >> 8) ^ key) >> 8) ^ key) & mask)
  182 
  183 struct lltable *lltable_init(struct ifnet *, int);
  184 void            lltable_free(struct lltable *);
  185 void            lltable_prefix_free(int, struct sockaddr *, 
  186                        struct sockaddr *, u_int);
  187 #if 0
  188 void            lltable_drain(int);
  189 #endif
  190 int             lltable_sysctl_dumparp(int, struct sysctl_req *);
  191 
  192 size_t          llentry_free(struct llentry *);
  193 int             llentry_update(struct llentry **, struct lltable *,
  194                        struct sockaddr_storage *, struct ifnet *);
  195 
  196 /*
  197  * Generic link layer address lookup function.
  198  */
  199 static __inline struct llentry *
  200 lla_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
  201 {
  202         return llt->llt_lookup(llt, flags, l3addr);
  203 }
  204 
  205 int             lla_rt_output(struct rt_msghdr *, struct rt_addrinfo *);
  206 #endif  /* _NET_IF_LLATBL_H_ */

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