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310 lines
11 KiB
C
310 lines
11 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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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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#ifndef _NET_IF_LLATBL_H_
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#define _NET_IF_LLATBL_H_
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#include <sys/_eventhandler.h>
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#include <sys/_rwlock.h>
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#include <netinet/in.h>
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#include <sys/epoch.h>
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#include <sys/ck.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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CK_LIST_HEAD(llentries, llentry);
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#define LLE_MAX_LINKHDR 24 /* Full IB header */
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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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CK_LIST_ENTRY(llentry) lle_next;
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union {
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struct in_addr addr4;
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struct in6_addr addr6;
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} r_l3addr;
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char r_linkdata[LLE_MAX_LINKHDR]; /* L2 data */
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uint8_t r_hdrlen; /* length for LL header */
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uint8_t r_family; /* Upper layer proto family */
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uint8_t spare0[2];
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uint16_t r_flags; /* LLE runtime flags */
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uint16_t r_skip_req; /* feedback from fast path */
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struct lltable *lle_tbl;
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struct llentries *lle_head;
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void (*lle_free)(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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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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time_t lle_remtime; /* Real time remaining */
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time_t lle_hittime; /* Time when r_skip_req was unset */
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int lle_refcnt;
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char *ll_addr; /* link-layer address */
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CK_SLIST_HEAD(llentry_children_head,llentry) lle_children; /* child encaps */
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CK_SLIST_ENTRY(llentry) lle_child_next; /* child encaps */
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struct llentry *lle_parent; /* parent for a child */
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CK_LIST_ENTRY(llentry) lle_chain; /* chain of deleted items */
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struct callout lle_timer;
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struct rwlock lle_lock;
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struct mtx req_mtx;
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struct epoch_context lle_epoch_ctx;
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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_REQ_INIT(lle) mtx_init(&(lle)->req_mtx, "lle req", \
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NULL, MTX_DEF)
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#define LLE_REQ_DESTROY(lle) mtx_destroy(&(lle)->req_mtx)
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#define LLE_REQ_LOCK(lle) mtx_lock(&(lle)->req_mtx)
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#define LLE_REQ_UNLOCK(lle) mtx_unlock(&(lle)->req_mtx)
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#define LLE_IS_VALID(lle) (((lle) != NULL) && ((lle) != (void *)-1))
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#define LLE_SF(_fam, _flags) (((_flags) & 0xFFFF) | ((_fam) << 16))
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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); \
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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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typedef struct llentry *(llt_lookup_t)(struct lltable *, u_int flags,
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const struct sockaddr *l3addr);
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typedef struct llentry *(llt_alloc_t)(struct lltable *, u_int flags,
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const struct sockaddr *l3addr);
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typedef void (llt_delete_t)(struct lltable *, struct llentry *);
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typedef void (llt_prefix_free_t)(struct lltable *,
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const struct sockaddr *addr, const struct sockaddr *mask, u_int flags);
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typedef int (llt_dump_entry_t)(struct lltable *, struct llentry *,
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struct sysctl_req *);
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typedef uint32_t (llt_hash_t)(const struct llentry *, uint32_t);
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typedef int (llt_match_prefix_t)(const struct sockaddr *,
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const struct sockaddr *, u_int, struct llentry *);
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typedef void (llt_free_entry_t)(struct lltable *, struct llentry *);
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typedef void (llt_fill_sa_entry_t)(const struct llentry *, struct sockaddr *);
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typedef void (llt_free_tbl_t)(struct lltable *);
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typedef int (llt_link_entry_t)(struct lltable *, struct llentry *);
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typedef int (llt_unlink_entry_t)(struct llentry *);
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typedef void (llt_mark_used_t)(struct llentry *);
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typedef void (llt_post_resolved_t)(struct lltable *, struct llentry *);
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typedef int (llt_foreach_cb_t)(struct lltable *, struct llentry *, void *);
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typedef int (llt_foreach_entry_t)(struct lltable *, llt_foreach_cb_t *, void *);
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typedef bool (llt_match_cb_t)(struct lltable *, struct llentry *, void *);
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struct lltable {
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SLIST_ENTRY(lltable) llt_link;
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sa_family_t llt_af;
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uint8_t llt_flags;
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uint8_t llt_spare[2];
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int llt_hsize;
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int llt_entries;
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int llt_maxentries;
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struct llentries *lle_head;
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struct ifnet *llt_ifp;
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llt_lookup_t *llt_lookup;
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llt_alloc_t *llt_alloc_entry;
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llt_delete_t *llt_delete_entry;
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llt_prefix_free_t *llt_prefix_free;
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llt_dump_entry_t *llt_dump_entry;
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llt_hash_t *llt_hash;
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llt_match_prefix_t *llt_match_prefix;
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llt_free_entry_t *llt_free_entry;
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llt_foreach_entry_t *llt_foreach_entry;
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llt_link_entry_t *llt_link_entry;
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llt_unlink_entry_t *llt_unlink_entry;
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llt_fill_sa_entry_t *llt_fill_sa_entry;
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llt_free_tbl_t *llt_free_tbl;
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llt_mark_used_t *llt_mark_used;
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llt_post_resolved_t *llt_post_resolved;
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};
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MALLOC_DECLARE(M_LLTABLE);
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/*
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* LLtable flags
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*/
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#define LLT_ADDEDPROXY 0x01 /* added a proxy llentry */
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/*
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* LLentry flags
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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_REDIRECT 0x0010 /* installed by redirect; has host rtentry */
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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_CHILD 0x0080 /* Child LLE storing different AF encap */
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/* LLE request flags */
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#define LLE_EXCLUSIVE 0x2000 /* return lle xlocked */
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#define LLE_UNLOCKED 0x4000 /* return lle unlocked */
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#define LLE_ADDRONLY 0x4000 /* return lladdr instead of full header */
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#define LLE_CREATE 0x8000 /* hint to avoid lle lookup */
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/* LLE flags used by fastpath code */
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#define RLLE_VALID 0x0001 /* entry is valid */
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#define RLLE_IFADDR LLE_IFADDR /* entry is ifaddr */
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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_allocate_htbl(uint32_t hsize);
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void lltable_free(struct lltable *);
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void lltable_link(struct lltable *llt);
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void lltable_prefix_free(int, struct sockaddr *,
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struct sockaddr *, u_int);
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int lltable_sysctl_dumparp(int, struct sysctl_req *);
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size_t lltable_append_entry_queue(struct llentry *,
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struct mbuf *, size_t);
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struct lltable *in_lltable_get(struct ifnet *ifp);
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struct lltable *in6_lltable_get(struct ifnet *ifp);
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struct lltable *lltable_get(struct ifnet *ifp, int family);
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size_t llentry_free(struct llentry *);
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/* helper functions */
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size_t lltable_drop_entry_queue(struct llentry *);
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void lltable_set_entry_addr(struct ifnet *ifp, struct llentry *lle,
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const char *linkhdr, size_t linkhdrsize, int lladdr_off);
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int lltable_try_set_entry_addr(struct ifnet *ifp, struct llentry *lle,
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const char *linkhdr, size_t linkhdrsize, int lladdr_off);
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int lltable_calc_llheader(struct ifnet *ifp, int family, char *lladdr,
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char *buf, size_t *bufsize, int *lladdr_off);
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void lltable_update_ifaddr(struct lltable *llt);
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struct llentry *lltable_alloc_entry(struct lltable *llt, u_int flags,
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const struct sockaddr *l4addr);
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void lltable_free_entry(struct lltable *llt, struct llentry *lle);
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int lltable_delete_addr(struct lltable *llt, u_int flags,
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const struct sockaddr *l3addr);
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int lltable_link_entry(struct lltable *llt, struct llentry *lle);
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int lltable_unlink_entry(struct lltable *llt, struct llentry *lle);
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void lltable_link_child_entry(struct llentry *parent_lle, struct llentry *child_lle);
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void lltable_unlink_child_entry(struct llentry *child_lle);
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void lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa);
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struct ifnet *lltable_get_ifp(const struct lltable *llt);
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int lltable_get_af(const struct lltable *llt);
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bool lltable_acquire_wlock(struct ifnet *ifp, struct llentry *lle);
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int lltable_foreach_lle(struct lltable *llt, llt_foreach_cb_t *f,
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void *farg);
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void lltable_delete_conditional(struct lltable *llt, llt_match_cb_t *func,
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void *farg);
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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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void llentry_request_feedback(struct llentry *lle);
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void llentry_mark_used(struct llentry *lle);
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time_t llentry_get_hittime(struct llentry *lle);
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int llentry_get_upper_family(const struct llentry *lle, int default_family);
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/*
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* Notify the LLE code that the entry was used by datapath.
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*/
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static __inline void
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llentry_provide_feedback(struct llentry *lle)
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{
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if (__predict_true(lle->r_skip_req == 0))
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return;
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llentry_mark_used(lle);
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}
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struct llentry *llentry_lookup_family(struct llentry *lle, int family);
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int lla_rt_output(struct rt_msghdr *, struct rt_addrinfo *);
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enum {
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LLENTRY_RESOLVED,
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LLENTRY_TIMEDOUT,
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LLENTRY_DELETED,
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LLENTRY_EXPIRED,
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};
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typedef void (*lle_event_fn)(void *, struct llentry *, int);
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EVENTHANDLER_DECLARE(lle_event, lle_event_fn);
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#endif /* _NET_IF_LLATBL_H_ */
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