if_llatbl.h revision 215207
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: head/sys/net/if_llatbl.h 215207 2010-11-12 22:03:02Z gnn $"); 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 36struct ifnet; 37struct sysctl_req; 38struct rt_msghdr; 39struct rt_addrinfo; 40 41struct llentry; 42LIST_HEAD(llentries, llentry); 43 44extern 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 */ 55struct llentry { 56 LIST_ENTRY(llentry) lle_next; 57 struct rwlock lle_lock; 58 struct lltable *lle_tbl; 59 struct llentries *lle_head; 60 struct mbuf *la_hold; 61 int la_numheld; /* # of packets currently held */ 62 time_t la_expire; 63 uint16_t la_flags; 64 uint16_t la_asked; 65 uint16_t la_preempt; 66 uint16_t ln_byhint; 67 int16_t ln_state; /* IPv6 has ND6_LLINFO_NOSTATE == -2 */ 68 uint16_t ln_router; 69 time_t ln_ntick; 70 int lle_refcnt; 71 72 union { 73 uint64_t mac_aligned; 74 uint16_t mac16[3]; 75 } ll_addr; 76 77 /* XXX af-private? */ 78 union { 79 struct callout ln_timer_ch; 80 struct callout la_timer; 81 } lle_timer; 82 /* NB: struct sockaddr must immediately follow */ 83}; 84 85#define LLE_WLOCK(lle) rw_wlock(&(lle)->lle_lock) 86#define LLE_RLOCK(lle) rw_rlock(&(lle)->lle_lock) 87#define LLE_WUNLOCK(lle) rw_wunlock(&(lle)->lle_lock) 88#define LLE_RUNLOCK(lle) rw_runlock(&(lle)->lle_lock) 89#define LLE_DOWNGRADE(lle) rw_downgrade(&(lle)->lle_lock) 90#define LLE_TRY_UPGRADE(lle) rw_try_upgrade(&(lle)->lle_lock) 91#define LLE_LOCK_INIT(lle) rw_init_flags(&(lle)->lle_lock, "lle", RW_DUPOK) 92#define LLE_LOCK_DESTROY(lle) rw_destroy(&(lle)->lle_lock) 93#define LLE_WLOCK_ASSERT(lle) rw_assert(&(lle)->lle_lock, RA_WLOCKED) 94 95#define LLE_IS_VALID(lle) (((lle) != NULL) && ((lle) != (void *)-1)) 96 97#define LLE_ADDREF(lle) do { \ 98 LLE_WLOCK_ASSERT(lle); \ 99 KASSERT((lle)->lle_refcnt >= 0, \ 100 ("negative refcnt %d", (lle)->lle_refcnt)); \ 101 (lle)->lle_refcnt++; \ 102} while (0) 103 104#define LLE_REMREF(lle) do { \ 105 LLE_WLOCK_ASSERT(lle); \ 106 KASSERT((lle)->lle_refcnt > 1, \ 107 ("bogus refcnt %d", (lle)->lle_refcnt)); \ 108 (lle)->lle_refcnt--; \ 109} while (0) 110 111#define LLE_FREE_LOCKED(lle) do { \ 112 if ((lle)->lle_refcnt <= 1) \ 113 (lle)->lle_tbl->llt_free((lle)->lle_tbl, (lle));\ 114 else { \ 115 (lle)->lle_refcnt--; \ 116 LLE_WUNLOCK(lle); \ 117 } \ 118 /* guard against invalid refs */ \ 119 lle = 0; \ 120} while (0) 121 122#define LLE_FREE(lle) do { \ 123 LLE_WLOCK(lle); \ 124 if ((lle)->lle_refcnt <= 1) \ 125 (lle)->lle_tbl->llt_free((lle)->lle_tbl, (lle));\ 126 else { \ 127 (lle)->lle_refcnt--; \ 128 LLE_WUNLOCK(lle); \ 129 } \ 130 /* guard against invalid refs */ \ 131 lle = NULL; \ 132} while (0) 133 134 135#define ln_timer_ch lle_timer.ln_timer_ch 136#define la_timer lle_timer.la_timer 137 138/* XXX bad name */ 139#define L3_ADDR(lle) ((struct sockaddr *)(&lle[1])) 140#define L3_ADDR_LEN(lle) (((struct sockaddr *)(&lle[1]))->sa_len) 141 142#ifndef LLTBL_HASHTBL_SIZE 143#define LLTBL_HASHTBL_SIZE 32 /* default 32 ? */ 144#endif 145 146#ifndef LLTBL_HASHMASK 147#define LLTBL_HASHMASK (LLTBL_HASHTBL_SIZE - 1) 148#endif 149 150struct lltable { 151 SLIST_ENTRY(lltable) llt_link; 152 struct llentries lle_head[LLTBL_HASHTBL_SIZE]; 153 int llt_af; 154 struct ifnet *llt_ifp; 155 156 struct llentry * (*llt_new)(const struct sockaddr *, u_int); 157 void (*llt_free)(struct lltable *, struct llentry *); 158 void (*llt_prefix_free)(struct lltable *, 159 const struct sockaddr *prefix, 160 const struct sockaddr *mask); 161 struct llentry * (*llt_lookup)(struct lltable *, u_int flags, 162 const struct sockaddr *l3addr); 163 int (*llt_rtcheck)(struct ifnet *, u_int flags, 164 const struct sockaddr *); 165 int (*llt_dump)(struct lltable *, 166 struct sysctl_req *); 167}; 168MALLOC_DECLARE(M_LLTABLE); 169 170/* 171 * flags to be passed to arplookup. 172 */ 173#define LLE_DELETED 0x0001 /* entry must be deleted */ 174#define LLE_STATIC 0x0002 /* entry is static */ 175#define LLE_IFADDR 0x0004 /* entry is interface addr */ 176#define LLE_VALID 0x0008 /* ll_addr is valid */ 177#define LLE_PROXY 0x0010 /* proxy entry ??? */ 178#define LLE_PUB 0x0020 /* publish entry ??? */ 179#define LLE_DELETE 0x4000 /* delete on a lookup - match LLE_IFADDR */ 180#define LLE_CREATE 0x8000 /* create on a lookup miss */ 181#define LLE_EXCLUSIVE 0x2000 /* return lle xlocked */ 182 183#define LLATBL_HASH(key, mask) \ 184 (((((((key >> 8) ^ key) >> 8) ^ key) >> 8) ^ key) & mask) 185 186struct lltable *lltable_init(struct ifnet *, int); 187void lltable_free(struct lltable *); 188void lltable_prefix_free(int, struct sockaddr *, 189 struct sockaddr *); 190#if 0 191void lltable_drain(int); 192#endif 193int lltable_sysctl_dumparp(int, struct sysctl_req *); 194 195size_t llentry_free(struct llentry *); 196int llentry_update(struct llentry **, struct lltable *, 197 struct sockaddr_storage *, struct ifnet *); 198 199/* 200 * Generic link layer address lookup function. 201 */ 202static __inline struct llentry * 203lla_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr) 204{ 205 return llt->llt_lookup(llt, flags, l3addr); 206} 207 208int lla_rt_output(struct rt_msghdr *, struct rt_addrinfo *); 209#endif /* _NET_IF_LLATBL_H_ */ 210