173 lines
4.0 KiB
C
173 lines
4.0 KiB
C
/*-
|
|
* Copyright (c) 2005 Paolo Pisati <piso@FreeBSD.org>
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
|
|
*
|
|
*/
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#ifdef _KERNEL
|
|
#include <sys/libkern.h>
|
|
#include <sys/param.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/rwlock.h>
|
|
#else
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <sys/types.h>
|
|
#include <errno.h>
|
|
#endif
|
|
|
|
#include <netinet/in_systm.h>
|
|
#include <netinet/in.h>
|
|
#include <netinet/ip.h>
|
|
|
|
#ifdef _KERNEL
|
|
#include <netinet/libalias/alias_local.h>
|
|
#include <netinet/libalias/alias_mod.h>
|
|
#else
|
|
#include "alias_local.h"
|
|
#include "alias_mod.h"
|
|
#endif
|
|
|
|
/* Protocol and userland module handlers chains. */
|
|
static TAILQ_HEAD(handler_chain, proto_handler) handler_chain =
|
|
TAILQ_HEAD_INITIALIZER(handler_chain);
|
|
|
|
static int
|
|
attach_handler(struct proto_handler *p)
|
|
{
|
|
struct proto_handler *b;
|
|
|
|
TAILQ_FOREACH(b, &handler_chain, link) {
|
|
if ((b->pri == p->pri) &&
|
|
(b->dir == p->dir) &&
|
|
(b->proto == p->proto))
|
|
return (EEXIST);
|
|
if (b->pri > p->pri) {
|
|
TAILQ_INSERT_BEFORE(b, p, link);
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
TAILQ_INSERT_TAIL(&handler_chain, p, link);
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
LibAliasAttachHandlers(struct proto_handler *p)
|
|
{
|
|
int error;
|
|
|
|
while (p->dir != NODIR) {
|
|
error = attach_handler(p);
|
|
if (error)
|
|
return (error);
|
|
p++;
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* XXXGL: should be void, but no good reason to break ABI */
|
|
int
|
|
LibAliasDetachHandlers(struct proto_handler *p)
|
|
{
|
|
|
|
while (p->dir != NODIR) {
|
|
TAILQ_REMOVE(&handler_chain, p, link);
|
|
p++;
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
find_handler(int8_t dir, int8_t proto, struct libalias *la, struct ip *ip,
|
|
struct alias_data *ad)
|
|
{
|
|
struct proto_handler *p;
|
|
|
|
TAILQ_FOREACH(p, &handler_chain, link)
|
|
if ((p->dir & dir) && (p->proto & proto) &&
|
|
p->fingerprint(la, ad) == 0)
|
|
return (p->protohandler(la, ip, ad));
|
|
|
|
return (ENOENT);
|
|
}
|
|
|
|
struct proto_handler *
|
|
first_handler(void)
|
|
{
|
|
|
|
return (TAILQ_FIRST(&handler_chain));
|
|
}
|
|
|
|
#ifndef _KERNEL
|
|
/* Dll manipulation code - this code is not thread safe... */
|
|
SLIST_HEAD(dll_chain, dll) dll_chain = SLIST_HEAD_INITIALIZER(dll_chain);
|
|
int
|
|
attach_dll(struct dll *p)
|
|
{
|
|
struct dll *b;
|
|
|
|
SLIST_FOREACH(b, &dll_chain, next) {
|
|
if (!strncmp(b->name, p->name, DLL_LEN))
|
|
return (EEXIST); /* Dll name conflict. */
|
|
}
|
|
SLIST_INSERT_HEAD(&dll_chain, p, next);
|
|
return (0);
|
|
}
|
|
|
|
void *
|
|
detach_dll(char *p)
|
|
{
|
|
struct dll *b, *b_tmp;
|
|
void *error;
|
|
|
|
b = NULL;
|
|
error = NULL;
|
|
SLIST_FOREACH_SAFE(b, &dll_chain, next, b_tmp)
|
|
if (!strncmp(b->name, p, DLL_LEN)) {
|
|
SLIST_REMOVE(&dll_chain, b, dll, next);
|
|
error = b;
|
|
break;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
struct dll *
|
|
walk_dll_chain(void)
|
|
{
|
|
struct dll *t;
|
|
|
|
t = SLIST_FIRST(&dll_chain);
|
|
if (t == NULL)
|
|
return (NULL);
|
|
SLIST_REMOVE_HEAD(&dll_chain, next);
|
|
return (t);
|
|
}
|
|
#endif /* !_KERNEL */
|