2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #ifndef _NET_IF_LLATBL_H_
33 #define _NET_IF_LLATBL_H_
35 #include <sys/_rwlock.h>
36 #include <netinet/in.h>
43 LIST_HEAD(llentries, llentry);
45 #define LLE_MAX_LINKHDR 24 /* Full IB header */
47 * Code referencing llentry must at least hold
51 LIST_ENTRY(llentry) lle_next;
54 struct in6_addr addr6;
56 char r_linkdata[LLE_MAX_LINKHDR]; /* L2 data */
57 uint8_t r_hdrlen; /* length for LL header */
59 uint16_t r_flags; /* LLE runtime flags */
60 uint16_t r_skip_req; /* feedback from fast path */
62 struct lltable *lle_tbl;
63 struct llentries *lle_head;
64 void (*lle_free)(struct llentry *);
66 int la_numheld; /* # of packets currently held */
71 int16_t ln_state; /* IPv6 has ND6_LLINFO_NOSTATE == -2 */
74 time_t lle_remtime; /* Real time remaining */
75 time_t lle_hittime; /* Time when r_skip_req was unset */
77 char *ll_addr; /* link-layer address */
79 LIST_ENTRY(llentry) lle_chain; /* chain of deleted items */
80 struct callout lle_timer;
81 struct rwlock lle_lock;
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)
95 #define LLE_REQ_INIT(lle) mtx_init(&(lle)->req_mtx, "lle req", \
97 #define LLE_REQ_DESTROY(lle) mtx_destroy(&(lle)->req_mtx)
98 #define LLE_REQ_LOCK(lle) mtx_lock(&(lle)->req_mtx)
99 #define LLE_REQ_UNLOCK(lle) mtx_unlock(&(lle)->req_mtx)
101 #define LLE_IS_VALID(lle) (((lle) != NULL) && ((lle) != (void *)-1))
103 #define LLE_ADDREF(lle) do { \
104 LLE_WLOCK_ASSERT(lle); \
105 KASSERT((lle)->lle_refcnt >= 0, \
106 ("negative refcnt %d on lle %p", \
107 (lle)->lle_refcnt, (lle))); \
108 (lle)->lle_refcnt++; \
111 #define LLE_REMREF(lle) do { \
112 LLE_WLOCK_ASSERT(lle); \
113 KASSERT((lle)->lle_refcnt > 0, \
114 ("bogus refcnt %d on lle %p", \
115 (lle)->lle_refcnt, (lle))); \
116 (lle)->lle_refcnt--; \
119 #define LLE_FREE_LOCKED(lle) do { \
120 if ((lle)->lle_refcnt == 1) \
121 (lle)->lle_free(lle); \
126 /* guard against invalid refs */ \
130 #define LLE_FREE(lle) do { \
132 LLE_FREE_LOCKED(lle); \
135 typedef struct llentry *(llt_lookup_t)(struct lltable *, u_int flags,
136 const struct sockaddr *l3addr);
137 typedef struct llentry *(llt_alloc_t)(struct lltable *, u_int flags,
138 const struct sockaddr *l3addr);
139 typedef void (llt_delete_t)(struct lltable *, struct llentry *);
140 typedef void (llt_prefix_free_t)(struct lltable *,
141 const struct sockaddr *addr, const struct sockaddr *mask, u_int flags);
142 typedef int (llt_dump_entry_t)(struct lltable *, struct llentry *,
143 struct sysctl_req *);
144 typedef uint32_t (llt_hash_t)(const struct llentry *, uint32_t);
145 typedef int (llt_match_prefix_t)(const struct sockaddr *,
146 const struct sockaddr *, u_int, struct llentry *);
147 typedef void (llt_free_entry_t)(struct lltable *, struct llentry *);
148 typedef void (llt_fill_sa_entry_t)(const struct llentry *, struct sockaddr *);
149 typedef void (llt_free_tbl_t)(struct lltable *);
150 typedef void (llt_link_entry_t)(struct lltable *, struct llentry *);
151 typedef void (llt_unlink_entry_t)(struct llentry *);
153 typedef int (llt_foreach_cb_t)(struct lltable *, struct llentry *, void *);
154 typedef int (llt_foreach_entry_t)(struct lltable *, llt_foreach_cb_t *, void *);
157 SLIST_ENTRY(lltable) llt_link;
160 struct llentries *lle_head;
161 struct ifnet *llt_ifp;
163 llt_lookup_t *llt_lookup;
164 llt_alloc_t *llt_alloc_entry;
165 llt_delete_t *llt_delete_entry;
166 llt_prefix_free_t *llt_prefix_free;
167 llt_dump_entry_t *llt_dump_entry;
168 llt_hash_t *llt_hash;
169 llt_match_prefix_t *llt_match_prefix;
170 llt_free_entry_t *llt_free_entry;
171 llt_foreach_entry_t *llt_foreach_entry;
172 llt_link_entry_t *llt_link_entry;
173 llt_unlink_entry_t *llt_unlink_entry;
174 llt_fill_sa_entry_t *llt_fill_sa_entry;
175 llt_free_tbl_t *llt_free_tbl;
178 MALLOC_DECLARE(M_LLTABLE);
183 #define LLE_DELETED 0x0001 /* entry must be deleted */
184 #define LLE_STATIC 0x0002 /* entry is static */
185 #define LLE_IFADDR 0x0004 /* entry is interface addr */
186 #define LLE_VALID 0x0008 /* ll_addr is valid */
187 #define LLE_REDIRECT 0x0010 /* installed by redirect; has host rtentry */
188 #define LLE_PUB 0x0020 /* publish entry ??? */
189 #define LLE_LINKED 0x0040 /* linked to lookup structure */
190 /* LLE request flags */
191 #define LLE_EXCLUSIVE 0x2000 /* return lle xlocked */
192 #define LLE_UNLOCKED 0x4000 /* return lle unlocked */
193 #define LLE_ADDRONLY 0x4000 /* return lladdr instead of full header */
194 #define LLE_CREATE 0x8000 /* hint to avoid lle lookup */
196 /* LLE flags used by fastpath code */
197 #define RLLE_VALID 0x0001 /* entry is valid */
198 #define RLLE_IFADDR LLE_IFADDR /* entry is ifaddr */
200 #define LLATBL_HASH(key, mask) \
201 (((((((key >> 8) ^ key) >> 8) ^ key) >> 8) ^ key) & mask)
203 struct lltable *lltable_allocate_htbl(uint32_t hsize);
204 void lltable_free(struct lltable *);
205 void lltable_link(struct lltable *llt);
206 void lltable_prefix_free(int, struct sockaddr *,
207 struct sockaddr *, u_int);
209 void lltable_drain(int);
211 int lltable_sysctl_dumparp(int, struct sysctl_req *);
213 size_t llentry_free(struct llentry *);
214 struct llentry *llentry_alloc(struct ifnet *, struct lltable *,
215 struct sockaddr_storage *);
217 /* helper functions */
218 size_t lltable_drop_entry_queue(struct llentry *);
219 void lltable_set_entry_addr(struct ifnet *ifp, struct llentry *lle,
220 const char *linkhdr, size_t linkhdrsize, int lladdr_off);
221 int lltable_try_set_entry_addr(struct ifnet *ifp, struct llentry *lle,
222 const char *linkhdr, size_t linkhdrsize, int lladdr_off);
224 int lltable_calc_llheader(struct ifnet *ifp, int family, char *lladdr,
225 char *buf, size_t *bufsize, int *lladdr_off);
226 void lltable_update_ifaddr(struct lltable *llt);
227 struct llentry *lltable_alloc_entry(struct lltable *llt, u_int flags,
228 const struct sockaddr *l4addr);
229 void lltable_free_entry(struct lltable *llt, struct llentry *lle);
230 int lltable_delete_addr(struct lltable *llt, u_int flags,
231 const struct sockaddr *l3addr);
232 void lltable_link_entry(struct lltable *llt, struct llentry *lle);
233 void lltable_unlink_entry(struct lltable *llt, struct llentry *lle);
234 void lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa);
235 struct ifnet *lltable_get_ifp(const struct lltable *llt);
236 int lltable_get_af(const struct lltable *llt);
238 int lltable_foreach_lle(struct lltable *llt, llt_foreach_cb_t *f,
241 * Generic link layer address lookup function.
243 static __inline struct llentry *
244 lla_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
247 return (llt->llt_lookup(llt, flags, l3addr));
250 int lla_rt_output(struct rt_msghdr *, struct rt_addrinfo *);
252 #include <sys/eventhandler.h>
259 typedef void (*lle_event_fn)(void *, struct llentry *, int);
260 EVENTHANDLER_DECLARE(lle_event, lle_event_fn);
261 #endif /* _NET_IF_LLATBL_H_ */