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.
106 lines
3.4 KiB
C
106 lines
3.4 KiB
C
/* $NetBSD: bt_proto.c,v 1.8 2007/05/02 20:40:24 dyoung Exp $ */
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/*-
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* Copyright (c) 2005 Iain Hibbert.
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* Copyright (c) 2006 Itronix Inc.
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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. The name of Itronix Inc. may not be used to endorse
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* or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY ITRONIX INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ITRONIX INC. BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: bt_proto.c,v 1.8 2007/05/02 20:40:24 dyoung Exp $");
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#include <sys/param.h>
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#include <sys/domain.h>
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#include <sys/kernel.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/systm.h>
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#include <net/route.h>
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#include <netbt/bluetooth.h>
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#include <netbt/hci.h>
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#include <netbt/l2cap.h>
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#include <netbt/rfcomm.h>
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#include <netbt/sco.h>
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DOMAIN_DEFINE(btdomain); /* forward declare and add to link set */
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const struct protosw btsw[] = {
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{ /* raw HCI commands */
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.pr_type = SOCK_RAW,
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.pr_domain = &btdomain,
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.pr_protocol = BTPROTO_HCI,
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.pr_flags = (PR_ADDR | PR_ATOMIC),
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.pr_ctloutput = hci_ctloutput,
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.pr_usrreq = hci_usrreq,
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},
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{ /* HCI SCO data (audio) */
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.pr_type = SOCK_SEQPACKET,
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.pr_domain = &btdomain,
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.pr_protocol = BTPROTO_SCO,
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.pr_flags = (PR_CONNREQUIRED | PR_ATOMIC | PR_LISTEN),
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.pr_ctloutput = sco_ctloutput,
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.pr_usrreq = sco_usrreq,
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},
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{ /* L2CAP Connection Oriented */
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.pr_type = SOCK_SEQPACKET,
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.pr_domain = &btdomain,
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.pr_protocol = BTPROTO_L2CAP,
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.pr_flags = (PR_CONNREQUIRED | PR_ATOMIC | PR_LISTEN),
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.pr_ctloutput = l2cap_ctloutput,
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.pr_usrreq = l2cap_usrreq,
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},
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{ /* RFCOMM */
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.pr_type = SOCK_STREAM,
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.pr_domain = &btdomain,
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.pr_protocol = BTPROTO_RFCOMM,
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.pr_flags = (PR_CONNREQUIRED | PR_LISTEN | PR_WANTRCVD),
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.pr_ctloutput = rfcomm_ctloutput,
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.pr_usrreq = rfcomm_usrreq,
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},
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};
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struct domain btdomain = {
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.dom_family = AF_BLUETOOTH,
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.dom_name = "bluetooth",
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.dom_init = NULL,
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.dom_externalize = NULL,
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.dom_dispose = NULL,
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.dom_protosw = btsw,
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.dom_protoswNPROTOSW = &btsw[sizeof(btsw)/sizeof(btsw[0])],
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.dom_rtattach = NULL,
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.dom_rtoffset = 32,
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.dom_maxrtkey = sizeof(struct sockaddr_bt),
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.dom_ifattach = NULL,
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.dom_ifdetach = NULL,
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.dom_ifqueues = { NULL, NULL },
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.dom_link = { NULL },
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.dom_mowner = MOWNER_INIT("",""),
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.dom_rtcache = LIST_HEAD_INITIALIZER(btdomain.dom_rtcache)
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};
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