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.
105 lines
3.4 KiB
C
105 lines
3.4 KiB
C
/* $NetBSD: natm_proto.c,v 1.11 2007/05/02 20:40:29 dyoung Exp $ */
|
|
|
|
/*
|
|
*
|
|
* Copyright (c) 1996 Charles D. Cranor and Washington University.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by Charles D. Cranor and
|
|
* Washington University.
|
|
* 4. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
/*
|
|
* protocol layer for access to native mode ATM
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: natm_proto.c,v 1.11 2007/05/02 20:40:29 dyoung Exp $");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/queue.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/protosw.h>
|
|
#include <sys/domain.h>
|
|
#include <sys/mbuf.h>
|
|
|
|
#include <net/if.h>
|
|
#include <net/radix.h>
|
|
#include <net/route.h>
|
|
|
|
#include <netinet/in.h>
|
|
|
|
#include <netnatm/natm.h>
|
|
|
|
DOMAIN_DEFINE(natmdomain);
|
|
|
|
static void natm_init(void);
|
|
|
|
struct npcblist natm_pcbs = LIST_HEAD_INITIALIZER(natm_pcbs);
|
|
struct ifqueue natmintrq; /* natm packet input queue */
|
|
int natmqmaxlen = IFQ_MAXLEN; /* max # of packets on queue */
|
|
|
|
const struct protosw natmsw[] = {
|
|
{ SOCK_STREAM, &natmdomain, PROTO_NATMAAL5, PR_CONNREQUIRED,
|
|
0, 0, 0, 0,
|
|
natm_usrreq,
|
|
0, 0, 0, 0,
|
|
},
|
|
{ SOCK_DGRAM, &natmdomain, PROTO_NATMAAL5, PR_CONNREQUIRED | PR_ATOMIC,
|
|
0, 0, 0, 0,
|
|
natm_usrreq,
|
|
0, 0, 0, 0,
|
|
},
|
|
{ SOCK_STREAM, &natmdomain, PROTO_NATMAAL0, PR_CONNREQUIRED,
|
|
0, 0, 0, 0,
|
|
natm_usrreq,
|
|
0, 0, 0, 0,
|
|
},
|
|
};
|
|
|
|
struct domain natmdomain = {
|
|
.dom_family = PF_NATM,
|
|
.dom_name = "natm",
|
|
.dom_init = natm_init,
|
|
.dom_protosw = natmsw,
|
|
.dom_protoswNPROTOSW = &natmsw[sizeof(natmsw)/sizeof(natmsw[0])],
|
|
.dom_ifqueues = { &natmintrq, NULL },
|
|
.dom_rtcache = LIST_HEAD_INITIALIZER(natmdomain.dom_rtcache)
|
|
};
|
|
#ifdef NATM_STAT
|
|
u_int natm_sodropcnt = 0; /* # mbufs dropped due to full sb */
|
|
u_int natm_sodropbytes = 0; /* # of bytes dropped */
|
|
u_int natm_sookcnt = 0; /* # mbufs ok */
|
|
u_int natm_sookbytes = 0; /* # of bytes ok */
|
|
#endif
|
|
|
|
void natm_init(void)
|
|
{
|
|
natmintrq.ifq_maxlen = natmqmaxlen;
|
|
}
|