72f0a6dfb0
route_in6, struct route_iso), replacing all caches with a struct
route.
The principle benefit of this change is that all of the protocol
families can benefit from route cache-invalidation, which is
necessary for correct routing. Route-cache invalidation fixes an
ancient PR, kern/3508, at long last; it fixes various other PRs,
also.
Discussions with and ideas from Joerg Sonnenberger influenced this
work tremendously. Of course, all design oversights and bugs are
mine.
DETAILS
1 I added to each address family a pool of sockaddrs. I have
introduced routines for allocating, copying, and duplicating,
and freeing sockaddrs:
struct sockaddr *sockaddr_alloc(sa_family_t af, int flags);
struct sockaddr *sockaddr_copy(struct sockaddr *dst,
const struct sockaddr *src);
struct sockaddr *sockaddr_dup(const struct sockaddr *src, int flags);
void sockaddr_free(struct sockaddr *sa);
sockaddr_alloc() returns either a sockaddr from the pool belonging
to the specified family, or NULL if the pool is exhausted. The
returned sockaddr has the right size for that family; sa_family
and sa_len fields are initialized to the family and sockaddr
length---e.g., sa_family = AF_INET and sa_len = sizeof(struct
sockaddr_in). sockaddr_free() puts the given sockaddr back into
its family's pool.
sockaddr_dup() and sockaddr_copy() work analogously to strdup()
and strcpy(), respectively. sockaddr_copy() KASSERTs that the
family of the destination and source sockaddrs are alike.
The 'flags' argumet for sockaddr_alloc() and sockaddr_dup() is
passed directly to pool_get(9).
2 I added routines for initializing sockaddrs in each address
family, sockaddr_in_init(), sockaddr_in6_init(), sockaddr_iso_init(),
etc. They are fairly self-explanatory.
3 structs route_in6 and route_iso are no more. All protocol families
use struct route. I have changed the route cache, 'struct route',
so that it does not contain storage space for a sockaddr. Instead,
struct route points to a sockaddr coming from the pool the sockaddr
belongs to. I added a new method to struct route, rtcache_setdst(),
for setting the cache destination:
int rtcache_setdst(struct route *, const struct sockaddr *);
rtcache_setdst() returns 0 on success, or ENOMEM if no memory is
available to create the sockaddr storage.
It is now possible for rtcache_getdst() to return NULL if, say,
rtcache_setdst() failed. I check the return value for NULL
everywhere in the kernel.
4 Each routing domain (struct domain) has a list of live route
caches, dom_rtcache. rtflushall(sa_family_t af) looks up the
domain indicated by 'af', walks the domain's list of route caches
and invalidates each one.
442 lines
14 KiB
C
442 lines
14 KiB
C
/* $NetBSD: nd6.h,v 1.46 2007/05/02 20:40:28 dyoung Exp $ */
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/* $KAME: nd6.h,v 1.95 2002/06/08 11:31:06 itojun Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* 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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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT 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 THE PROJECT 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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#ifndef _NETINET6_ND6_H_
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#define _NETINET6_ND6_H_
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/* see net/route.h, or net/if_inarp.h */
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#ifndef RTF_ANNOUNCE
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#define RTF_ANNOUNCE RTF_PROTO2
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#endif
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#include <sys/queue.h>
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#include <sys/callout.h>
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struct llinfo_nd6 {
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struct llinfo_nd6 *ln_next;
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struct llinfo_nd6 *ln_prev;
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struct rtentry *ln_rt;
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struct mbuf *ln_hold; /* last packet until resolved/timeout */
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long ln_asked; /* number of queries already sent for this addr */
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u_long ln_expire; /* lifetime for NDP state transition */
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short ln_state; /* reachability state */
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short ln_router; /* 2^0: ND6 router bit */
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int ln_byhint; /* # of times we made it reachable by UL hint */
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long ln_ntick;
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struct callout ln_timer_ch;
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};
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#define ND6_LLINFO_NOSTATE -2
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/*
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* We don't need the WAITDELETE state any more, but we keep the definition
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* in a comment line instead of removing it. This is necessary to avoid
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* unintentionally reusing the value for another purpose, which might
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* affect backward compatibility with old applications.
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* (20000711 jinmei@kame.net)
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*/
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/* #define ND6_LLINFO_WAITDELETE -1 */
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#define ND6_LLINFO_INCOMPLETE 0
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#define ND6_LLINFO_REACHABLE 1
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#define ND6_LLINFO_STALE 2
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#define ND6_LLINFO_DELAY 3
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#define ND6_LLINFO_PROBE 4
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#define ND6_IS_LLINFO_PROBREACH(n) ((n)->ln_state > ND6_LLINFO_INCOMPLETE)
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#define ND6_LLINFO_PERMANENT(n) (((n)->ln_expire == 0) && ((n)->ln_state > ND6_LLINFO_INCOMPLETE))
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struct nd_ifinfo {
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u_int32_t linkmtu; /* LinkMTU */
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u_int32_t maxmtu; /* Upper bound of LinkMTU */
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u_int32_t basereachable; /* BaseReachableTime */
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u_int32_t reachable; /* Reachable Time */
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u_int32_t retrans; /* Retrans Timer */
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u_int32_t flags; /* Flags */
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int recalctm; /* BaseReacable re-calculation timer */
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u_int8_t chlim; /* CurHopLimit */
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u_int8_t initialized; /* Flag to see the entry is initialized */
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/* the following 3 members are for privacy extension for addrconf */
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u_int8_t randomseed0[8]; /* upper 64 bits of MD5 digest */
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u_int8_t randomseed1[8]; /* lower 64 bits (usually the EUI64 IFID) */
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u_int8_t randomid[8]; /* current random ID */
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};
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#define ND6_IFF_PERFORMNUD 0x1
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#define ND6_IFF_ACCEPT_RTADV 0x2
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#define ND6_IFF_PREFER_SOURCE 0x4 /* XXX: not related to ND. */
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#define ND6_IFF_IFDISABLED 0x8 /* IPv6 operation is disabled due to
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* DAD failure. (XXX: not ND-specific)
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*/
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#ifdef _KERNEL
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#define ND_IFINFO(ifp) \
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(((struct in6_ifextra *)(ifp)->if_afdata[AF_INET6])->nd_ifinfo)
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#define IN6_LINKMTU(ifp) \
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((ND_IFINFO(ifp)->linkmtu && ND_IFINFO(ifp)->linkmtu < (ifp)->if_mtu) \
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? ND_IFINFO(ifp)->linkmtu \
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: ((ND_IFINFO(ifp)->maxmtu && ND_IFINFO(ifp)->maxmtu < (ifp)->if_mtu) \
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? ND_IFINFO(ifp)->maxmtu : (ifp)->if_mtu))
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#endif
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struct in6_nbrinfo {
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char ifname[IFNAMSIZ]; /* if name, e.g. "en0" */
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struct in6_addr addr; /* IPv6 address of the neighbor */
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long asked; /* number of queries already sent for this addr */
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int isrouter; /* if it acts as a router */
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int state; /* reachability state */
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int expire; /* lifetime for NDP state transition */
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};
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#define DRLSTSIZ 10
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#define PRLSTSIZ 10
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struct in6_drlist {
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char ifname[IFNAMSIZ];
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struct {
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struct in6_addr rtaddr;
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u_char flags;
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u_short rtlifetime;
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u_long expire;
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u_short if_index;
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} defrouter[DRLSTSIZ];
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};
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struct in6_defrouter {
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struct sockaddr_in6 rtaddr;
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u_char flags;
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u_short rtlifetime;
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u_long expire;
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u_short if_index;
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};
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#ifdef _KERNEL
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struct in6_oprlist {
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char ifname[IFNAMSIZ];
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struct {
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struct in6_addr prefix;
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struct prf_ra raflags;
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u_char prefixlen;
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u_char origin;
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u_long vltime;
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u_long pltime;
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u_long expire;
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u_short if_index;
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u_short advrtrs; /* number of advertisement routers */
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struct in6_addr advrtr[DRLSTSIZ]; /* XXX: explicit limit */
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} prefix[PRLSTSIZ];
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};
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#endif
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struct in6_prlist {
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char ifname[IFNAMSIZ];
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struct {
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struct in6_addr prefix;
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struct prf_ra raflags;
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u_char prefixlen;
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u_char origin;
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u_int32_t vltime;
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u_int32_t pltime;
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time_t expire;
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u_short if_index;
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u_short advrtrs; /* number of advertisement routers */
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struct in6_addr advrtr[DRLSTSIZ]; /* XXX: explicit limit */
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} prefix[PRLSTSIZ];
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};
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struct in6_prefix {
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struct sockaddr_in6 prefix;
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struct prf_ra raflags;
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u_char prefixlen;
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u_char origin;
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u_int32_t vltime;
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u_int32_t pltime;
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time_t expire;
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u_int32_t flags;
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int refcnt;
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u_short if_index;
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u_short advrtrs; /* number of advertisement routers */
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/* struct sockaddr_in6 advrtr[] */
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};
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#ifdef _KERNEL
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struct in6_ondireq {
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char ifname[IFNAMSIZ];
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struct {
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u_int32_t linkmtu; /* LinkMTU */
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u_int32_t maxmtu; /* Upper bound of LinkMTU */
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u_int32_t basereachable; /* BaseReachableTime */
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u_int32_t reachable; /* Reachable Time */
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u_int32_t retrans; /* Retrans Timer */
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u_int32_t flags; /* Flags */
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int recalctm; /* BaseReacable re-calculation timer */
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u_int8_t chlim; /* CurHopLimit */
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u_int8_t receivedra;
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} ndi;
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};
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#endif
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struct in6_ndireq {
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char ifname[IFNAMSIZ];
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struct nd_ifinfo ndi;
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};
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struct in6_ndifreq {
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char ifname[IFNAMSIZ];
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u_long ifindex;
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};
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/* Prefix status */
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#define NDPRF_ONLINK 0x1
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#define NDPRF_DETACHED 0x2
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#define NDPRF_HOME 0x4
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/* protocol constants */
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#define MAX_RTR_SOLICITATION_DELAY 1 /* 1sec */
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#define RTR_SOLICITATION_INTERVAL 4 /* 4sec */
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#define MAX_RTR_SOLICITATIONS 3
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#define ND6_INFINITE_LIFETIME 0xffffffff
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#ifdef _KERNEL
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/* node constants */
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#define MAX_REACHABLE_TIME 3600000 /* msec */
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#define REACHABLE_TIME 30000 /* msec */
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#define RETRANS_TIMER 1000 /* msec */
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#define MIN_RANDOM_FACTOR 512 /* 1024 * 0.5 */
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#define MAX_RANDOM_FACTOR 1536 /* 1024 * 1.5 */
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#define DEF_TEMP_VALID_LIFETIME 604800 /* 1 week */
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#define DEF_TEMP_PREFERRED_LIFETIME 86400 /* 1 day */
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#define TEMPADDR_REGEN_ADVANCE 5 /* sec */
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#define MAX_TEMP_DESYNC_FACTOR 600 /* 10 min */
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#define ND_COMPUTE_RTIME(x) \
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(((MIN_RANDOM_FACTOR * (x >> 10)) + (arc4random() & \
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((MAX_RANDOM_FACTOR - MIN_RANDOM_FACTOR) * (x >> 10)))) /1000)
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TAILQ_HEAD(nd_drhead, nd_defrouter);
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struct nd_defrouter {
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TAILQ_ENTRY(nd_defrouter) dr_entry;
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struct in6_addr rtaddr;
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u_char flags; /* flags on RA message */
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u_short rtlifetime;
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u_long expire;
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struct ifnet *ifp;
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int installed; /* is installed into kernel routing table */
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};
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struct nd_prefixctl {
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struct ifnet *ndpr_ifp;
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/* prefix */
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struct sockaddr_in6 ndpr_prefix;
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u_char ndpr_plen;
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u_int32_t ndpr_vltime; /* advertised valid lifetime */
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u_int32_t ndpr_pltime; /* advertised preferred lifetime */
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struct prf_ra ndpr_flags;
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};
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struct nd_prefix {
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struct ifnet *ndpr_ifp;
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LIST_ENTRY(nd_prefix) ndpr_entry;
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struct sockaddr_in6 ndpr_prefix; /* prefix */
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struct in6_addr ndpr_mask; /* netmask derived from the prefix */
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u_int32_t ndpr_vltime; /* advertised valid lifetime */
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u_int32_t ndpr_pltime; /* advertised preferred lifetime */
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time_t ndpr_expire; /* expiration time of the prefix */
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time_t ndpr_preferred; /* preferred time of the prefix */
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time_t ndpr_lastupdate; /* reception time of last advertisement */
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struct prf_ra ndpr_flags;
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u_int32_t ndpr_stateflags; /* actual state flags */
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/* list of routers that advertise the prefix: */
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LIST_HEAD(pr_rtrhead, nd_pfxrouter) ndpr_advrtrs;
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u_char ndpr_plen;
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int ndpr_refcnt; /* reference couter from addresses */
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};
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#define ndpr_raf ndpr_flags
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#define ndpr_raf_onlink ndpr_flags.onlink
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#define ndpr_raf_auto ndpr_flags.autonomous
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#define ndpr_raf_router ndpr_flags.router
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/*
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* Message format for use in obtaining information about prefixes
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* from inet6 sysctl function
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*/
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struct inet6_ndpr_msghdr {
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u_short inpm_msglen; /* to skip over non-understood messages */
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u_char inpm_version; /* future binary compatibility */
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u_char inpm_type; /* message type */
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struct in6_addr inpm_prefix;
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u_long prm_vltim;
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u_long prm_pltime;
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u_long prm_expire;
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u_long prm_preferred;
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struct in6_prflags prm_flags;
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u_short prm_index; /* index for associated ifp */
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u_char prm_plen; /* length of prefix in bits */
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};
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#define prm_raf_onlink prm_flags.prf_ra.onlink
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#define prm_raf_auto prm_flags.prf_ra.autonomous
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#define prm_statef_onlink prm_flags.prf_state.onlink
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#define prm_rrf_decrvalid prm_flags.prf_rr.decrvalid
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#define prm_rrf_decrprefd prm_flags.prf_rr.decrprefd
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struct nd_pfxrouter {
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LIST_ENTRY(nd_pfxrouter) pfr_entry;
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struct nd_defrouter *router;
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};
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LIST_HEAD(nd_prhead, nd_prefix);
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#include <sys/mallocvar.h>
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MALLOC_DECLARE(M_IP6NDP);
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/* nd6.c */
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extern int nd6_prune;
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extern int nd6_delay;
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extern int nd6_umaxtries;
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extern int nd6_mmaxtries;
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extern int nd6_useloopback;
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extern int nd6_maxnudhint;
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extern int nd6_gctimer;
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extern struct llinfo_nd6 llinfo_nd6;
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extern struct nd_drhead nd_defrouter;
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extern struct nd_prhead nd_prefix;
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extern int nd6_debug;
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#define nd6log(x) do { if (nd6_debug) log x; } while (/*CONSTCOND*/ 0)
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extern struct callout nd6_timer_ch;
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/* nd6_rtr.c */
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extern int nd6_defifindex;
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extern int ip6_desync_factor; /* seconds */
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extern u_int32_t ip6_temp_preferred_lifetime; /* seconds */
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extern u_int32_t ip6_temp_valid_lifetime; /* seconds */
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extern int ip6_temp_regen_advance; /* seconds */
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union nd_opts {
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struct nd_opt_hdr *nd_opt_array[8];
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struct {
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struct nd_opt_hdr *zero;
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struct nd_opt_hdr *src_lladdr;
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struct nd_opt_hdr *tgt_lladdr;
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struct nd_opt_prefix_info *pi_beg; /* multiple opts, start */
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struct nd_opt_rd_hdr *rh;
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struct nd_opt_mtu *mtu;
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struct nd_opt_hdr *search; /* multiple opts */
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struct nd_opt_hdr *last; /* multiple opts */
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int done;
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struct nd_opt_prefix_info *pi_end;/* multiple opts, end */
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} nd_opt_each;
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};
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#define nd_opts_src_lladdr nd_opt_each.src_lladdr
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#define nd_opts_tgt_lladdr nd_opt_each.tgt_lladdr
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#define nd_opts_pi nd_opt_each.pi_beg
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#define nd_opts_pi_end nd_opt_each.pi_end
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#define nd_opts_rh nd_opt_each.rh
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#define nd_opts_mtu nd_opt_each.mtu
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#define nd_opts_search nd_opt_each.search
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#define nd_opts_last nd_opt_each.last
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#define nd_opts_done nd_opt_each.done
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/* XXX: need nd6_var.h?? */
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/* nd6.c */
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void nd6_init(void);
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struct nd_ifinfo *nd6_ifattach(struct ifnet *);
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void nd6_ifdetach(struct nd_ifinfo *);
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int nd6_is_addr_neighbor(const struct sockaddr_in6 *, struct ifnet *);
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void nd6_option_init(void *, int, union nd_opts *);
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struct nd_opt_hdr *nd6_option(union nd_opts *);
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int nd6_options(union nd_opts *);
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struct rtentry *nd6_lookup(const struct in6_addr *, int, struct ifnet *);
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void nd6_setmtu(struct ifnet *);
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void nd6_llinfo_settimer(struct llinfo_nd6 *, long);
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void nd6_timer(void *);
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void nd6_purge(struct ifnet *);
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void nd6_nud_hint(struct rtentry *, struct in6_addr *, int);
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int nd6_resolve(struct ifnet *, struct rtentry *,
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struct mbuf *, struct sockaddr *, u_char *);
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void nd6_rtrequest(int, struct rtentry *, struct rt_addrinfo *);
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int nd6_ioctl(u_long, void *, struct ifnet *);
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struct rtentry *nd6_cache_lladdr(struct ifnet *, struct in6_addr *,
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char *, int, int, int);
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int nd6_output(struct ifnet *, struct ifnet *, struct mbuf *,
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const struct sockaddr_in6 *, struct rtentry *);
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int nd6_storelladdr(const struct ifnet *, const struct rtentry *, struct mbuf *,
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const struct sockaddr *, uint8_t *, size_t);
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int nd6_sysctl(int, void *, size_t *, void *, size_t);
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int nd6_need_cache(struct ifnet *);
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/* nd6_nbr.c */
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void nd6_na_input(struct mbuf *, int, int);
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void nd6_na_output(struct ifnet *, const struct in6_addr *,
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const struct in6_addr *, u_long, int, struct sockaddr *);
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void nd6_ns_input(struct mbuf *, int, int);
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void nd6_ns_output(struct ifnet *, const struct in6_addr *,
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const struct in6_addr *, struct llinfo_nd6 *, int);
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void *nd6_ifptomac(struct ifnet *);
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void nd6_dad_start(struct ifaddr *, int);
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void nd6_dad_stop(struct ifaddr *);
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void nd6_dad_duplicated(struct ifaddr *);
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/* nd6_rtr.c */
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void nd6_rs_input(struct mbuf *, int, int);
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void nd6_ra_input(struct mbuf *, int, int);
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void prelist_del(struct nd_prefix *);
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void defrouter_addreq(struct nd_defrouter *);
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void defrouter_reset(void);
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void defrouter_select(void);
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void defrtrlist_del(struct nd_defrouter *);
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void prelist_remove(struct nd_prefix *);
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int nd6_prelist_add(struct nd_prefixctl *, struct nd_defrouter *,
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struct nd_prefix **);
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int nd6_prefix_onlink(struct nd_prefix *);
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int nd6_prefix_offlink(struct nd_prefix *);
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void pfxlist_onlink_check(void);
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struct nd_defrouter *defrouter_lookup(struct in6_addr *, struct ifnet *);
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struct nd_prefix *nd6_prefix_lookup(struct nd_prefixctl *);
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int in6_ifdel(struct ifnet *, struct in6_addr *);
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void rt6_flush(struct in6_addr *, struct ifnet *);
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int nd6_setdefaultiface(int);
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int in6_tmpifadd(const struct in6_ifaddr *, int, int);
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#endif /* _KERNEL */
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#endif /* !_NETINET6_ND6_H_ */
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