1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2004 Luigi Rizzo, Alessandro Cerri. All rights reserved. 5 * Copyright (c) 2004-2008 Qing Li. All rights reserved. 6 * Copyright (c) 2008 Kip Macy. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #ifndef _NET_IF_LLATBL_H_ 33 #define _NET_IF_LLATBL_H_ 34 35 #include <sys/_eventhandler.h> 36 #include <sys/_rwlock.h> 37 #include <netinet/in.h> 38 #include <sys/epoch.h> 39 #include <sys/ck.h> 40 41 struct ifnet; 42 struct sysctl_req; 43 struct rt_msghdr; 44 struct rt_addrinfo; 45 struct llentry; 46 CK_LIST_HEAD(llentries, llentry); 47 48 #define LLE_MAX_LINKHDR 24 /* Full IB header */ 49 /* 50 * Code referencing llentry must at least hold 51 * a shared lock 52 */ 53 struct llentry { 54 CK_LIST_ENTRY(llentry) lle_next; 55 union { 56 struct in_addr addr4; 57 struct in6_addr addr6; 58 } r_l3addr; 59 char r_linkdata[LLE_MAX_LINKHDR]; /* L2 data */ 60 uint8_t r_hdrlen; /* length for LL header */ 61 uint8_t spare0[3]; 62 uint16_t r_flags; /* LLE runtime flags */ 63 uint16_t r_skip_req; /* feedback from fast path */ 64 65 struct lltable *lle_tbl; 66 struct llentries *lle_head; 67 void (*lle_free)(struct llentry *); 68 struct mbuf *la_hold; 69 int la_numheld; /* # of packets currently held */ 70 time_t la_expire; 71 uint16_t la_flags; 72 uint16_t la_asked; 73 uint16_t la_preempt; 74 int16_t ln_state; /* IPv6 has ND6_LLINFO_NOSTATE == -2 */ 75 uint16_t ln_router; 76 time_t ln_ntick; 77 time_t lle_remtime; /* Real time remaining */ 78 time_t lle_hittime; /* Time when r_skip_req was unset */ 79 int lle_refcnt; 80 char *ll_addr; /* link-layer address */ 81 82 CK_LIST_ENTRY(llentry) lle_chain; /* chain of deleted items */ 83 struct callout lle_timer; 84 struct rwlock lle_lock; 85 struct mtx req_mtx; 86 struct epoch_context lle_epoch_ctx; 87 }; 88 89 #define LLE_WLOCK(lle) rw_wlock(&(lle)->lle_lock) 90 #define LLE_RLOCK(lle) rw_rlock(&(lle)->lle_lock) 91 #define LLE_WUNLOCK(lle) rw_wunlock(&(lle)->lle_lock) 92 #define LLE_RUNLOCK(lle) rw_runlock(&(lle)->lle_lock) 93 #define LLE_DOWNGRADE(lle) rw_downgrade(&(lle)->lle_lock) 94 #define LLE_TRY_UPGRADE(lle) rw_try_upgrade(&(lle)->lle_lock) 95 #define LLE_LOCK_INIT(lle) rw_init_flags(&(lle)->lle_lock, "lle", RW_DUPOK) 96 #define LLE_LOCK_DESTROY(lle) rw_destroy(&(lle)->lle_lock) 97 #define LLE_WLOCK_ASSERT(lle) rw_assert(&(lle)->lle_lock, RA_WLOCKED) 98 99 #define LLE_REQ_INIT(lle) mtx_init(&(lle)->req_mtx, "lle req", \ 100 NULL, MTX_DEF) 101 #define LLE_REQ_DESTROY(lle) mtx_destroy(&(lle)->req_mtx) 102 #define LLE_REQ_LOCK(lle) mtx_lock(&(lle)->req_mtx) 103 #define LLE_REQ_UNLOCK(lle) mtx_unlock(&(lle)->req_mtx) 104 105 #define LLE_IS_VALID(lle) (((lle) != NULL) && ((lle) != (void *)-1)) 106 107 #define LLE_ADDREF(lle) do { \ 108 LLE_WLOCK_ASSERT(lle); \ 109 KASSERT((lle)->lle_refcnt >= 0, \ 110 ("negative refcnt %d on lle %p", \ 111 (lle)->lle_refcnt, (lle))); \ 112 (lle)->lle_refcnt++; \ 113 } while (0) 114 115 #define LLE_REMREF(lle) do { \ 116 LLE_WLOCK_ASSERT(lle); \ 117 KASSERT((lle)->lle_refcnt > 0, \ 118 ("bogus refcnt %d on lle %p", \ 119 (lle)->lle_refcnt, (lle))); \ 120 (lle)->lle_refcnt--; \ 121 } while (0) 122 123 #define LLE_FREE_LOCKED(lle) do { \ 124 if ((lle)->lle_refcnt == 1) \ 125 (lle)->lle_free(lle); \ 126 else { \ 127 LLE_REMREF(lle); \ 128 LLE_WUNLOCK(lle); \ 129 } \ 130 /* guard against invalid refs */ \ 131 (lle) = NULL; \ 132 } while (0) 133 134 #define LLE_FREE(lle) do { \ 135 LLE_WLOCK(lle); \ 136 LLE_FREE_LOCKED(lle); \ 137 } while (0) 138 139 typedef struct llentry *(llt_lookup_t)(struct lltable *, u_int flags, 140 const struct sockaddr *l3addr); 141 typedef struct llentry *(llt_alloc_t)(struct lltable *, u_int flags, 142 const struct sockaddr *l3addr); 143 typedef void (llt_delete_t)(struct lltable *, struct llentry *); 144 typedef void (llt_prefix_free_t)(struct lltable *, 145 const struct sockaddr *addr, const struct sockaddr *mask, u_int flags); 146 typedef int (llt_dump_entry_t)(struct lltable *, struct llentry *, 147 struct sysctl_req *); 148 typedef uint32_t (llt_hash_t)(const struct llentry *, uint32_t); 149 typedef int (llt_match_prefix_t)(const struct sockaddr *, 150 const struct sockaddr *, u_int, struct llentry *); 151 typedef void (llt_free_entry_t)(struct lltable *, struct llentry *); 152 typedef void (llt_fill_sa_entry_t)(const struct llentry *, struct sockaddr *); 153 typedef void (llt_free_tbl_t)(struct lltable *); 154 typedef void (llt_link_entry_t)(struct lltable *, struct llentry *); 155 typedef void (llt_unlink_entry_t)(struct llentry *); 156 typedef void (llt_mark_used_t)(struct llentry *); 157 158 typedef int (llt_foreach_cb_t)(struct lltable *, struct llentry *, void *); 159 typedef int (llt_foreach_entry_t)(struct lltable *, llt_foreach_cb_t *, void *); 160 161 struct lltable { 162 SLIST_ENTRY(lltable) llt_link; 163 int llt_af; 164 int llt_hsize; 165 struct llentries *lle_head; 166 struct ifnet *llt_ifp; 167 168 llt_lookup_t *llt_lookup; 169 llt_alloc_t *llt_alloc_entry; 170 llt_delete_t *llt_delete_entry; 171 llt_prefix_free_t *llt_prefix_free; 172 llt_dump_entry_t *llt_dump_entry; 173 llt_hash_t *llt_hash; 174 llt_match_prefix_t *llt_match_prefix; 175 llt_free_entry_t *llt_free_entry; 176 llt_foreach_entry_t *llt_foreach_entry; 177 llt_link_entry_t *llt_link_entry; 178 llt_unlink_entry_t *llt_unlink_entry; 179 llt_fill_sa_entry_t *llt_fill_sa_entry; 180 llt_free_tbl_t *llt_free_tbl; 181 llt_mark_used_t *llt_mark_used; 182 }; 183 184 MALLOC_DECLARE(M_LLTABLE); 185 186 /* 187 * LLentry flags 188 */ 189 #define LLE_DELETED 0x0001 /* entry must be deleted */ 190 #define LLE_STATIC 0x0002 /* entry is static */ 191 #define LLE_IFADDR 0x0004 /* entry is interface addr */ 192 #define LLE_VALID 0x0008 /* ll_addr is valid */ 193 #define LLE_REDIRECT 0x0010 /* installed by redirect; has host rtentry */ 194 #define LLE_PUB 0x0020 /* publish entry ??? */ 195 #define LLE_LINKED 0x0040 /* linked to lookup structure */ 196 /* LLE request flags */ 197 #define LLE_EXCLUSIVE 0x2000 /* return lle xlocked */ 198 #define LLE_UNLOCKED 0x4000 /* return lle unlocked */ 199 #define LLE_ADDRONLY 0x4000 /* return lladdr instead of full header */ 200 #define LLE_CREATE 0x8000 /* hint to avoid lle lookup */ 201 202 /* LLE flags used by fastpath code */ 203 #define RLLE_VALID 0x0001 /* entry is valid */ 204 #define RLLE_IFADDR LLE_IFADDR /* entry is ifaddr */ 205 206 #define LLATBL_HASH(key, mask) \ 207 (((((((key >> 8) ^ key) >> 8) ^ key) >> 8) ^ key) & mask) 208 209 struct lltable *lltable_allocate_htbl(uint32_t hsize); 210 void lltable_free(struct lltable *); 211 void lltable_link(struct lltable *llt); 212 void lltable_prefix_free(int, struct sockaddr *, 213 struct sockaddr *, u_int); 214 int lltable_sysctl_dumparp(int, struct sysctl_req *); 215 216 size_t llentry_free(struct llentry *); 217 218 /* helper functions */ 219 size_t lltable_drop_entry_queue(struct llentry *); 220 void lltable_set_entry_addr(struct ifnet *ifp, struct llentry *lle, 221 const char *linkhdr, size_t linkhdrsize, int lladdr_off); 222 int lltable_try_set_entry_addr(struct ifnet *ifp, struct llentry *lle, 223 const char *linkhdr, size_t linkhdrsize, int lladdr_off); 224 225 int lltable_calc_llheader(struct ifnet *ifp, int family, char *lladdr, 226 char *buf, size_t *bufsize, int *lladdr_off); 227 void lltable_update_ifaddr(struct lltable *llt); 228 struct llentry *lltable_alloc_entry(struct lltable *llt, u_int flags, 229 const struct sockaddr *l4addr); 230 void lltable_free_entry(struct lltable *llt, struct llentry *lle); 231 int lltable_delete_addr(struct lltable *llt, u_int flags, 232 const struct sockaddr *l3addr); 233 void lltable_link_entry(struct lltable *llt, struct llentry *lle); 234 void lltable_unlink_entry(struct lltable *llt, struct llentry *lle); 235 void lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa); 236 struct ifnet *lltable_get_ifp(const struct lltable *llt); 237 int lltable_get_af(const struct lltable *llt); 238 239 int lltable_foreach_lle(struct lltable *llt, llt_foreach_cb_t *f, 240 void *farg); 241 /* 242 * Generic link layer address lookup function. 243 */ 244 static __inline struct llentry * 245 lla_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr) 246 { 247 248 return (llt->llt_lookup(llt, flags, l3addr)); 249 } 250 251 /* 252 * Notify the LLE code that the entry was used by datapath. 253 */ 254 static __inline void 255 llentry_mark_used(struct llentry *lle) 256 { 257 258 if (lle->r_skip_req == 0) 259 return; 260 if ((lle->r_flags & RLLE_VALID) != 0) 261 lle->lle_tbl->llt_mark_used(lle); 262 } 263 264 int lla_rt_output(struct rt_msghdr *, struct rt_addrinfo *); 265 266 enum { 267 LLENTRY_RESOLVED, 268 LLENTRY_TIMEDOUT, 269 LLENTRY_DELETED, 270 LLENTRY_EXPIRED, 271 }; 272 typedef void (*lle_event_fn)(void *, struct llentry *, int); 273 EVENTHANDLER_DECLARE(lle_event, lle_event_fn); 274 #endif /* _NET_IF_LLATBL_H_ */ 275