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/*
* Copyright (c) 2004 Luigi Rizzo, Alessandro Cerri. All rights reserved.
* Copyright (c) 2004-2008 Qing Li. All rights reserved.
* Copyright (c) 2008 Kip Macy. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#ifndef _NET_IF_LLATBL_H_
#define _NET_IF_LLATBL_H_
#include <sys/_rwlock.h>
#include <netinet/in.h>
struct ifnet;
struct sysctl_req;
struct rt_msghdr;
struct rt_addrinfo;
struct llentry;
LIST_HEAD(llentries, llentry);
extern struct rwlock lltable_rwlock;
#define LLTABLE_RLOCK() rw_rlock(&lltable_rwlock)
#define LLTABLE_RUNLOCK() rw_runlock(&lltable_rwlock)
#define LLTABLE_WLOCK() rw_wlock(&lltable_rwlock)
#define LLTABLE_WUNLOCK() rw_wunlock(&lltable_rwlock)
#define LLTABLE_LOCK_ASSERT() rw_assert(&lltable_rwlock, RA_LOCKED)
struct llentry {
/* FIELDS PROTECTED BY IFDATA LOCK */
LIST_ENTRY(llentry) lle_next;
union {
struct in_addr addr4;
struct in6_addr addr6;
} r_l3addr;
union {
uint64_t mac_aligned;
uint16_t mac16[3];
uint8_t mac8[20]; /* IB needs 20 bytes. */
char ll_prepend[20]; /* L2 data to prepend */
} ll_addr;
uint16_t r_flags; /* runtime flags */
uint16_t r_len; /* length of prepend data */
uint64_t r_kick; /* for unused lle detection */
/* FIELDS PROTECTED BY LLE rwlock */
struct lltable *lle_tbl;
struct llentries *lle_head;
void (*lle_free)(struct llentry *);
struct mbuf *la_hold;
int la_numheld; /* # of packets currently held */
time_t la_expire;
uint16_t la_flags;
uint16_t la_asked;
uint16_t la_preempt;
uint16_t ln_byhint;
int16_t ln_state; /* IPv6 has ND6_LLINFO_NOSTATE == -2 */
uint16_t ln_router;
time_t ln_ntick;
int lle_refcnt;
LIST_ENTRY(llentry) lle_chain; /* chain of deleted items */
struct rwlock lle_lock;
/* XXX af-private? */
union {
struct callout ln_timer_ch;
struct callout la_timer;
} lle_timer;
/* NB: struct sockaddr must immediately follow */
};
#define LLE_WLOCK(lle) rw_wlock(&(lle)->lle_lock)
#define LLE_RLOCK(lle) rw_rlock(&(lle)->lle_lock)
#define LLE_WUNLOCK(lle) rw_wunlock(&(lle)->lle_lock)
#define LLE_RUNLOCK(lle) rw_runlock(&(lle)->lle_lock)
#define LLE_LOCK_INIT(lle) rw_init_flags(&(lle)->lle_lock, "lle", RW_DUPOK)
#define LLE_LOCK_DESTROY(lle) rw_destroy(&(lle)->lle_lock)
#define LLE_WLOCK_ASSERT(lle) rw_assert(&(lle)->lle_lock, RA_WLOCKED)
#define LLE_ADDREF(lle) do { \
LLE_WLOCK_ASSERT(lle); \
KASSERT((lle)->lle_refcnt >= 0, \
("negative refcnt %d on lle %p", \
(lle)->lle_refcnt, (lle))); \
(lle)->lle_refcnt++; \
} while (0)
#define LLE_REMREF(lle) do { \
LLE_WLOCK_ASSERT(lle); \
KASSERT((lle)->lle_refcnt > 0, \
("bogus refcnt %d on lle %p", \
(lle)->lle_refcnt, (lle))); \
(lle)->lle_refcnt--; \
} while (0)
#define LLE_FREE_LOCKED(lle) do { \
if ((lle)->lle_refcnt == 1) \
(lle)->lle_free((lle)); \
else { \
LLE_REMREF(lle); \
LLE_WUNLOCK(lle); \
} \
/* guard against invalid refs */ \
(lle) = NULL; \
} while (0)
#define LLE_FREE(lle) do { \
LLE_WLOCK(lle); \
LLE_FREE_LOCKED(lle); \
} while (0)
#define ln_timer_ch lle_timer.ln_timer_ch
#define la_timer lle_timer.la_timer
/* XXX bad name */
#define L3_ADDR(lle) ((struct sockaddr *)(&lle[1]))
#define L3_ADDR_LEN(lle) (((struct sockaddr *)(&lle[1]))->sa_len)
#ifndef LLTBL_HASHTBL_SIZE
#define LLTBL_HASHTBL_SIZE 32 /* default 32 ? */
#endif
#ifndef LLTBL_HASHMASK
#define LLTBL_HASHMASK (LLTBL_HASHTBL_SIZE - 1)
#endif
typedef struct llentry *(llt_lookup_t)(struct lltable *, u_int flags,
const void *paddr);
typedef struct llentry *(llt_create_t)(struct lltable *, u_int flags,
const void *paddr);
typedef int (llt_delete_addr_t)(struct lltable *, u_int flags,
const struct sockaddr *l3addr);
typedef int (llt_dump_entry_t)(struct lltable *, struct llentry *,
struct sysctl_req *);
typedef uint32_t (llt_hash_t)(const struct llentry *);
typedef int (llt_match_prefix_t)(const struct sockaddr *,
const struct sockaddr *, u_int, struct llentry *);
typedef void (llt_clear_entry_t)(struct lltable *, struct llentry *);
typedef void (llt_free_tbl_t)(struct lltable *);
typedef void (llt_link_entry_t)(struct lltable *, struct llentry *);
typedef void (llt_unlink_entry_t)(struct llentry *);
typedef int (llt_prepare_sentry_t)(struct lltable *, struct llentry *,
struct rt_addrinfo *);
typedef const void *(llt_get_sa_addr_t)(const struct sockaddr *l3addr);
typedef int (llt_foreach_cb_t)(struct lltable *, struct llentry *, void *);
typedef int (llt_foreach_entry_t)(struct lltable *, llt_foreach_cb_t *, void *);
struct lltable {
SLIST_ENTRY(lltable) llt_link;
struct llentries lle_head[LLTBL_HASHTBL_SIZE];
int llt_af;
struct ifnet *llt_ifp;
llt_lookup_t *llt_lookup;
llt_create_t *llt_create;
llt_delete_addr_t *llt_delete_addr;
llt_dump_entry_t *llt_dump_entry;
llt_hash_t *llt_hash;
llt_match_prefix_t *llt_match_prefix;
llt_clear_entry_t *llt_clear_entry;
llt_foreach_entry_t *llt_foreach_entry;
llt_link_entry_t *llt_link_entry;
llt_unlink_entry_t *llt_unlink_entry;
llt_prepare_sentry_t *llt_prepare_static_entry;
llt_get_sa_addr_t *llt_get_sa_addr;
llt_free_tbl_t *llt_free_tbl;
};
MALLOC_DECLARE(M_LLTABLE);
/*
* LLE flags used by fast path code
*/
#define RLLE_VALID 0x0001 /* ll_addr can be used */
/*
* Various LLE flags
*/
#define LLE_DELETED 0x0001 /* entry must be deleted */
#define LLE_STATIC 0x0002 /* entry is static */
#define LLE_IFADDR 0x0004 /* entry is interface addr */
#define LLE_VALID 0x0008 /* ll_addr is valid */
#define LLE_PUB 0x0020 /* publish entry ??? */
#define LLE_LINKED 0x0040 /* linked to lookup structure */
#define LLE_CALLOUTREF 0x0080 /* callout set */
/* LLE request flags */
#define LLE_UNLOCKED 0x0100 /* return lle unlocked */
#define LLE_EXCLUSIVE 0x0200 /* return lle wlocked */
#define LLATBL_HASH(key, mask) \
(((((((key >> 8) ^ key) >> 8) ^ key) >> 8) ^ key) & mask)
void lltable_link(struct lltable *);
void lltable_free(struct lltable *);
void lltable_prefix_free(int, struct sockaddr *,
struct sockaddr *, u_int);
#if 0
void lltable_drain(int);
#endif
int lltable_sysctl_dumparp(int, struct sysctl_req *);
struct llentry *llentry_alloc(struct ifnet *, struct lltable *,
struct sockaddr_storage *);
/* helper functions */
size_t lltable_drop_entry_queue(struct llentry *);
/*
* Generic link layer address lookup function.
*/
static __inline struct llentry *
lltable_lookup_lle(struct lltable *llt, u_int flags,
const void *paddr)
{
return (llt->llt_lookup(llt, flags, paddr));
}
static __inline struct llentry *
lltable_create_lle(struct lltable *llt, u_int flags,
const void *paddr)
{
return (llt->llt_create(llt, flags, paddr));
}
static __inline int
lltable_delete_addr(struct lltable *llt, u_int flags,
const struct sockaddr *l3addr)
{
return llt->llt_delete_addr(llt, flags, l3addr);
}
static __inline void
lltable_link_entry(struct lltable *llt, struct llentry *lle)
{
llt->llt_link_entry(llt, lle);
}
static __inline void
lltable_unlink_entry(struct lltable *llt, struct llentry *lle)
{
llt->llt_unlink_entry(lle);
}
int lla_rt_output(struct rt_msghdr *, struct rt_addrinfo *);
#include <sys/eventhandler.h>
enum {
LLENTRY_RESOLVED,
LLENTRY_TIMEDOUT,
LLENTRY_DELETED,
LLENTRY_EXPIRED,
};
typedef void (*lle_event_fn)(void *, struct llentry *, int);
EVENTHANDLER_DECLARE(lle_event, lle_event_fn);
#endif /* _NET_IF_LLATBL_H_ */
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