535e0a0981
- Remove locking, since all module(9) events are running under &Giant. - Use TAILQ for protocol handlers and fix a bug which led to infinite cycle. Bug found in VirtualBox [1] - Simplify code everywhere. - Fix documentation. [1] https://www.virtualbox.org/pipermail/vbox-dev/2013-November/011936.html PR: 183792 [1] Submitted by: Valery Ushakov <uwe NetBSD.org> [1] Sponsored by: Nginx, Inc.
173 lines
4.0 KiB
C
173 lines
4.0 KiB
C
/*-
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* Copyright (c) 2005 Paolo Pisati <piso@FreeBSD.org>
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#ifdef _KERNEL
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#include <sys/libkern.h>
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#include <sys/param.h>
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#include <sys/lock.h>
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#include <sys/rwlock.h>
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#else
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#include <stdio.h>
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#include <string.h>
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#include <sys/types.h>
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#include <errno.h>
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#endif
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#include <netinet/in_systm.h>
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#ifdef _KERNEL
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#include <netinet/libalias/alias_local.h>
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#include <netinet/libalias/alias_mod.h>
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#else
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#include "alias_local.h"
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#include "alias_mod.h"
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#endif
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/* Protocol and userland module handlers chains. */
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static TAILQ_HEAD(handler_chain, proto_handler) handler_chain =
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TAILQ_HEAD_INITIALIZER(handler_chain);
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static int
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attach_handler(struct proto_handler *p)
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{
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struct proto_handler *b;
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TAILQ_FOREACH(b, &handler_chain, link) {
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if ((b->pri == p->pri) &&
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(b->dir == p->dir) &&
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(b->proto == p->proto))
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return (EEXIST);
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if (b->pri > p->pri) {
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TAILQ_INSERT_BEFORE(b, p, link);
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return (0);
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}
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}
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TAILQ_INSERT_TAIL(&handler_chain, p, link);
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return (0);
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}
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int
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LibAliasAttachHandlers(struct proto_handler *p)
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{
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int error;
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while (p->dir != NODIR) {
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error = attach_handler(p);
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if (error)
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return (error);
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p++;
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}
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return (0);
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}
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/* XXXGL: should be void, but no good reason to break ABI */
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int
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LibAliasDetachHandlers(struct proto_handler *p)
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{
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while (p->dir != NODIR) {
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TAILQ_REMOVE(&handler_chain, p, link);
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p++;
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}
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return (0);
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}
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int
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find_handler(int8_t dir, int8_t proto, struct libalias *la, struct ip *ip,
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struct alias_data *ad)
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{
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struct proto_handler *p;
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TAILQ_FOREACH(p, &handler_chain, link)
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if ((p->dir & dir) && (p->proto & proto) &&
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p->fingerprint(la, ad) == 0)
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return (p->protohandler(la, ip, ad));
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return (ENOENT);
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}
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struct proto_handler *
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first_handler(void)
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{
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return (TAILQ_FIRST(&handler_chain));
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}
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#ifndef _KERNEL
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/* Dll manipulation code - this code is not thread safe... */
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SLIST_HEAD(dll_chain, dll) dll_chain = SLIST_HEAD_INITIALIZER(dll_chain);
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int
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attach_dll(struct dll *p)
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{
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struct dll *b;
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SLIST_FOREACH(b, &dll_chain, next) {
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if (!strncmp(b->name, p->name, DLL_LEN))
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return (EEXIST); /* Dll name conflict. */
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}
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SLIST_INSERT_HEAD(&dll_chain, p, next);
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return (0);
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}
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void *
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detach_dll(char *p)
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{
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struct dll *b, *b_tmp;
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void *error;
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b = NULL;
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error = NULL;
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SLIST_FOREACH_SAFE(b, &dll_chain, next, b_tmp)
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if (!strncmp(b->name, p, DLL_LEN)) {
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SLIST_REMOVE(&dll_chain, b, dll, next);
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error = b;
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break;
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}
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return (error);
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}
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struct dll *
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walk_dll_chain(void)
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{
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struct dll *t;
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t = SLIST_FIRST(&dll_chain);
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if (t == NULL)
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return (NULL);
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SLIST_REMOVE_HEAD(&dll_chain, next);
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return (t);
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}
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#endif /* !_KERNEL */
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