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.
|
||
|---|---|---|
| .. | ||
| xebec | ||
| Makefile | ||
| README | ||
| argo_debug.h | ||
| clnl.h | ||
| clnp.h | ||
| clnp_debug.c | ||
| clnp_er.c | ||
| clnp_frag.c | ||
| clnp_input.c | ||
| clnp_options.c | ||
| clnp_output.c | ||
| clnp_raw.c | ||
| clnp_stat.h | ||
| clnp_subr.c | ||
| clnp_timer.c | ||
| cltp_usrreq.c | ||
| cltp_var.h | ||
| cons.h | ||
| cons_pcb.h | ||
| eonvar.h | ||
| esis.c | ||
| esis.h | ||
| files.netiso | ||
| idrp_usrreq.c | ||
| idrp_var.h | ||
| if_eon.c | ||
| iso.c | ||
| iso.h | ||
| iso_chksum.c | ||
| iso_errno.h | ||
| iso_pcb.c | ||
| iso_pcb.h | ||
| iso_proto.c | ||
| iso_snpac.c | ||
| iso_snpac.h | ||
| iso_var.h | ||
| tp.trans | ||
| tp_astring.c | ||
| tp_clnp.h | ||
| tp_cons.c | ||
| tp_driver.c | ||
| tp_emit.c | ||
| tp_events.h | ||
| tp_inet.c | ||
| tp_input.c | ||
| tp_ip.h | ||
| tp_iso.c | ||
| tp_meas.c | ||
| tp_meas.h | ||
| tp_output.c | ||
| tp_param.h | ||
| tp_pcb.c | ||
| tp_pcb.h | ||
| tp_seq.h | ||
| tp_stat.h | ||
| tp_states.h | ||
| tp_states.init | ||
| tp_subr.c | ||
| tp_subr2.c | ||
| tp_timer.c | ||
| tp_timer.h | ||
| tp_tpdu.h | ||
| tp_trace.c | ||
| tp_trace.h | ||
| tp_user.h | ||
| tp_usrreq.c | ||
| tp_var.h | ||
README
In case you were wondering why this code is still present: The ISO (or OSI) stack is still in use by many router vendors (e.g., using IS-IS the OSI equivalent of OSPF, to carry IP routes). Chris. chopps@NetBSD.org