17a036563d
On receipt of a redirect message, install an interface route for the
redirected destination. On removal of the corresponding Neighbor Cache
entry, remove the interface route.
This requires changes in rtredirect_fib() to cope with an AF_LINK
address for the gateway and with the absence of RTF_GATEWAY.
This fixes the "Redirected On-Link" test cases in the Tahi IPv6 Ready Logo
Phase 2 test suite.
Unrelated to the above, fix a recursion on the radix node head lock
triggered by the Tahi Redirected to Alternate Router test cases.
When I first wrote this patch in October 2012, all Section 2
(Neighbor Discovery) test cases passed on 10-CURRENT, 9-STABLE,
and 8-STABLE. cem@ recently rebased the 10.x patch onto head and reported
that it passes Tahi. (Thanks!)
These other test cases also passed in 2012:
* the RTF_MODIFIED case, with IPv4 and IPv6 (using a
RTF_HOST|RTF_GATEWAY route for the destination)
* the redirected-to-self case, with IPv4 and IPv6
* a valid IPv4 redirect
All testing in 2012 was done with WITNESS and INVARIANTS.
Tested by: EMC / Isilon Storage Division via Conrad Meyer (cem) in 2015,
Mark Kelley <mark_kelley@dell.com> in 2012,
TC Telkamp <terence_telkamp@dell.com> in 2012
PR: 152791
Reviewed by: melifaro (current rev), bz (earlier rev)
Approved by: kib (mentor)
MFC after: 1 month
Relnotes: yes
Sponsored by: Dell Inc.
Differential Revision: https://reviews.freebsd.org/D3602
247 lines
8.2 KiB
C
247 lines
8.2 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 <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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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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union {
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uint64_t mac_aligned;
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uint16_t mac16[3];
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uint8_t mac8[20]; /* IB needs 20 bytes. */
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} ll_addr;
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uint32_t spare0;
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uint64_t spare1;
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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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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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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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};
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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); \
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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 void (llt_link_entry_t)(struct lltable *, struct llentry *);
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typedef void (llt_unlink_entry_t)(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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struct lltable {
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SLIST_ENTRY(lltable) llt_link;
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int llt_af;
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int llt_hsize;
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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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};
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MALLOC_DECLARE(M_LLTABLE);
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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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/* LLE request flags */
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#define LLE_EXCLUSIVE 0x2000 /* return lle xlocked */
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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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#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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/* helper functions */
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size_t lltable_drop_entry_queue(struct llentry *);
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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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void lltable_link_entry(struct lltable *llt, struct llentry *lle);
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void lltable_unlink_entry(struct lltable *llt, struct llentry *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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int lltable_foreach_lle(struct lltable *llt, llt_foreach_cb_t *f,
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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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int lla_rt_output(struct rt_msghdr *, struct rt_addrinfo *);
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#include <sys/eventhandler.h>
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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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