ea53792942
llentry_free() and arptimer():
o Use callout_init_rw() for lle timeout, this allows us safely
disestablish them.
- This allows us to simplify the arptimer() and make it
race safe.
o Consistently use ifp->if_afdata_lock to lock access to
linked lists in the lle hashes.
o Introduce new lle flag LLE_LINKED, which marks an entry that
is attached to the hash.
- Use LLE_LINKED to avoid double unlinking via consequent
calls to llentry_free().
- Mark lle with LLE_DELETED via |= operation istead of =,
so that other flags won't be lost.
o Make LLE_ADDREF(), LLE_REMREF() and LLE_FREE_LOCKED() more
consistent and provide more informative KASSERTs.
The patch is a collaborative work of all submitters and myself.
PR: kern/165863
Submitted by: Andrey Zonov <andrey zonov.org>
Submitted by: Ryan Stone <rysto32 gmail.com>
Submitted by: Eric van Gyzen <eric_van_gyzen dell.com>
209 lines
6.5 KiB
C
209 lines
6.5 KiB
C
/*
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* Copyright (c) 2004 Luigi Rizzo, Alessandro Cerri. All rights reserved.
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* Copyright (c) 2004-2008 Qing Li. All rights reserved.
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* Copyright (c) 2008 Kip Macy. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#ifndef _NET_IF_LLATBL_H_
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#define _NET_IF_LLATBL_H_
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#include "opt_ofed.h"
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#include <sys/_rwlock.h>
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#include <netinet/in.h>
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struct ifnet;
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struct sysctl_req;
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struct rt_msghdr;
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struct rt_addrinfo;
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struct llentry;
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LIST_HEAD(llentries, llentry);
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extern struct rwlock lltable_rwlock;
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#define LLTABLE_RLOCK() rw_rlock(&lltable_rwlock)
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#define LLTABLE_RUNLOCK() rw_runlock(&lltable_rwlock)
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#define LLTABLE_WLOCK() rw_wlock(&lltable_rwlock)
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#define LLTABLE_WUNLOCK() rw_wunlock(&lltable_rwlock)
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#define LLTABLE_LOCK_ASSERT() rw_assert(&lltable_rwlock, RA_LOCKED)
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/*
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* Code referencing llentry must at least hold
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* a shared lock
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*/
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struct llentry {
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LIST_ENTRY(llentry) lle_next;
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struct rwlock lle_lock;
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struct lltable *lle_tbl;
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struct llentries *lle_head;
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void (*lle_free)(struct lltable *, struct llentry *);
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struct mbuf *la_hold;
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int la_numheld; /* # of packets currently held */
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time_t la_expire;
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uint16_t la_flags;
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uint16_t la_asked;
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uint16_t la_preempt;
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uint16_t ln_byhint;
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int16_t ln_state; /* IPv6 has ND6_LLINFO_NOSTATE == -2 */
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uint16_t ln_router;
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time_t ln_ntick;
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int lle_refcnt;
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union {
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uint64_t mac_aligned;
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uint16_t mac16[3];
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#ifdef OFED
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uint8_t mac8[20]; /* IB needs 20 bytes. */
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#endif
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} ll_addr;
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/* XXX af-private? */
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union {
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struct callout ln_timer_ch;
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struct callout la_timer;
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} lle_timer;
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/* NB: struct sockaddr must immediately follow */
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};
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#define LLE_WLOCK(lle) rw_wlock(&(lle)->lle_lock)
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#define LLE_RLOCK(lle) rw_rlock(&(lle)->lle_lock)
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#define LLE_WUNLOCK(lle) rw_wunlock(&(lle)->lle_lock)
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#define LLE_RUNLOCK(lle) rw_runlock(&(lle)->lle_lock)
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#define LLE_DOWNGRADE(lle) rw_downgrade(&(lle)->lle_lock)
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#define LLE_TRY_UPGRADE(lle) rw_try_upgrade(&(lle)->lle_lock)
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#define LLE_LOCK_INIT(lle) rw_init_flags(&(lle)->lle_lock, "lle", RW_DUPOK)
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#define LLE_LOCK_DESTROY(lle) rw_destroy(&(lle)->lle_lock)
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#define LLE_WLOCK_ASSERT(lle) rw_assert(&(lle)->lle_lock, RA_WLOCKED)
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#define LLE_IS_VALID(lle) (((lle) != NULL) && ((lle) != (void *)-1))
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#define LLE_ADDREF(lle) do { \
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LLE_WLOCK_ASSERT(lle); \
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KASSERT((lle)->lle_refcnt >= 0, \
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("negative refcnt %d on lle %p", \
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(lle)->lle_refcnt, (lle))); \
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(lle)->lle_refcnt++; \
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} while (0)
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#define LLE_REMREF(lle) do { \
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LLE_WLOCK_ASSERT(lle); \
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KASSERT((lle)->lle_refcnt > 0, \
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("bogus refcnt %d on lle %p", \
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(lle)->lle_refcnt, (lle))); \
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(lle)->lle_refcnt--; \
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} while (0)
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#define LLE_FREE_LOCKED(lle) do { \
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if ((lle)->lle_refcnt == 1) \
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(lle)->lle_free((lle)->lle_tbl, (lle)); \
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else { \
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LLE_REMREF(lle); \
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LLE_WUNLOCK(lle); \
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} \
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/* guard against invalid refs */ \
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(lle) = NULL; \
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} while (0)
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#define LLE_FREE(lle) do { \
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LLE_WLOCK(lle); \
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LLE_FREE_LOCKED(lle); \
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} while (0)
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#define ln_timer_ch lle_timer.ln_timer_ch
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#define la_timer lle_timer.la_timer
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/* XXX bad name */
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#define L3_ADDR(lle) ((struct sockaddr *)(&lle[1]))
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#define L3_ADDR_LEN(lle) (((struct sockaddr *)(&lle[1]))->sa_len)
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#ifndef LLTBL_HASHTBL_SIZE
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#define LLTBL_HASHTBL_SIZE 32 /* default 32 ? */
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#endif
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#ifndef LLTBL_HASHMASK
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#define LLTBL_HASHMASK (LLTBL_HASHTBL_SIZE - 1)
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#endif
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struct lltable {
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SLIST_ENTRY(lltable) llt_link;
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struct llentries lle_head[LLTBL_HASHTBL_SIZE];
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int llt_af;
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struct ifnet *llt_ifp;
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void (*llt_prefix_free)(struct lltable *,
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const struct sockaddr *prefix,
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const struct sockaddr *mask,
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u_int flags);
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struct llentry * (*llt_lookup)(struct lltable *, u_int flags,
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const struct sockaddr *l3addr);
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int (*llt_dump)(struct lltable *,
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struct sysctl_req *);
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};
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MALLOC_DECLARE(M_LLTABLE);
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/*
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* flags to be passed to arplookup.
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*/
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#define LLE_DELETED 0x0001 /* entry must be deleted */
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#define LLE_STATIC 0x0002 /* entry is static */
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#define LLE_IFADDR 0x0004 /* entry is interface addr */
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#define LLE_VALID 0x0008 /* ll_addr is valid */
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#define LLE_PROXY 0x0010 /* proxy entry ??? */
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#define LLE_PUB 0x0020 /* publish entry ??? */
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#define LLE_LINKED 0x0040 /* linked to lookup structure */
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#define LLE_EXCLUSIVE 0x2000 /* return lle xlocked */
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#define LLE_DELETE 0x4000 /* delete on a lookup - match LLE_IFADDR */
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#define LLE_CREATE 0x8000 /* create on a lookup miss */
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#define LLATBL_HASH(key, mask) \
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(((((((key >> 8) ^ key) >> 8) ^ key) >> 8) ^ key) & mask)
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struct lltable *lltable_init(struct ifnet *, int);
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void lltable_free(struct lltable *);
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void lltable_prefix_free(int, struct sockaddr *,
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struct sockaddr *, u_int);
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#if 0
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void lltable_drain(int);
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#endif
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int lltable_sysctl_dumparp(int, struct sysctl_req *);
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size_t llentry_free(struct llentry *);
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struct llentry *llentry_alloc(struct ifnet *, struct lltable *,
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struct sockaddr_storage *);
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/*
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* Generic link layer address lookup function.
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*/
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static __inline struct llentry *
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lla_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
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{
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return llt->llt_lookup(llt, flags, l3addr);
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}
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int lla_rt_output(struct rt_msghdr *, struct rt_addrinfo *);
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#endif /* _NET_IF_LLATBL_H_ */
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