1/*- 2 * Copyright (c) 2005 Paolo Pisati <piso@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 */ 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD$"); 29 30#ifdef _KERNEL 31#include <sys/libkern.h> 32#include <sys/param.h> 33#include <sys/lock.h> 34#include <sys/rwlock.h> 35#else 36#include <stdio.h> 37#include <string.h> 38#include <sys/types.h> 39#include <errno.h> 40#endif 41 42#include <netinet/in_systm.h> 43#include <netinet/in.h> 44#include <netinet/ip.h> 45 46#ifdef _KERNEL 47#include <netinet/libalias/alias_local.h> 48#include <netinet/libalias/alias_mod.h> 49#else 50#include "alias_local.h" 51#include "alias_mod.h" 52#endif 53 54/* Protocol and userland module handlers chains. */ 55static TAILQ_HEAD(handler_chain, proto_handler) handler_chain = 56 TAILQ_HEAD_INITIALIZER(handler_chain); 57 58static int 59attach_handler(struct proto_handler *p) 60{ 61 struct proto_handler *b; 62 63 TAILQ_FOREACH(b, &handler_chain, link) { 64 if ((b->pri == p->pri) && 65 (b->dir == p->dir) && 66 (b->proto == p->proto)) 67 return (EEXIST); 68 if (b->pri > p->pri) { 69 TAILQ_INSERT_BEFORE(b, p, link); 70 return (0); 71 } 72 } 73 74 TAILQ_INSERT_TAIL(&handler_chain, p, link); 75 76 return (0); 77} 78 79int 80LibAliasAttachHandlers(struct proto_handler *p) 81{ 82 int error; 83 84 while (p->dir != NODIR) { 85 error = attach_handler(p); 86 if (error) 87 return (error); 88 p++; 89 } 90 91 return (0); 92} 93 94/* XXXGL: should be void, but no good reason to break ABI */ 95int 96LibAliasDetachHandlers(struct proto_handler *p) 97{ 98 99 while (p->dir != NODIR) { 100 TAILQ_REMOVE(&handler_chain, p, link); 101 p++; 102 } 103 104 return (0); 105} 106 107int 108find_handler(int8_t dir, int8_t proto, struct libalias *la, struct ip *ip, 109 struct alias_data *ad) 110{ 111 struct proto_handler *p; 112 113 TAILQ_FOREACH(p, &handler_chain, link) 114 if ((p->dir & dir) && (p->proto & proto) && 115 p->fingerprint(la, ad) == 0) 116 return (p->protohandler(la, ip, ad)); 117 118 return (ENOENT); 119} 120 121struct proto_handler * 122first_handler(void) 123{ 124 125 return (TAILQ_FIRST(&handler_chain)); 126} 127 128#ifndef _KERNEL 129/* Dll manipulation code - this code is not thread safe... */ 130SLIST_HEAD(dll_chain, dll) dll_chain = SLIST_HEAD_INITIALIZER(dll_chain); 131int 132attach_dll(struct dll *p) 133{ 134 struct dll *b; 135 136 SLIST_FOREACH(b, &dll_chain, next) { 137 if (!strncmp(b->name, p->name, DLL_LEN)) 138 return (EEXIST); /* Dll name conflict. */ 139 } 140 SLIST_INSERT_HEAD(&dll_chain, p, next); 141 return (0); 142} 143 144void * 145detach_dll(char *p) 146{ 147 struct dll *b, *b_tmp; 148 void *error; 149 150 b = NULL; 151 error = NULL; 152 SLIST_FOREACH_SAFE(b, &dll_chain, next, b_tmp) 153 if (!strncmp(b->name, p, DLL_LEN)) { 154 SLIST_REMOVE(&dll_chain, b, dll, next); 155 error = b; 156 break; 157 } 158 return (error); 159} 160 161struct dll * 162walk_dll_chain(void) 163{ 164 struct dll *t; 165 166 t = SLIST_FIRST(&dll_chain); 167 if (t == NULL) 168 return (NULL); 169 SLIST_REMOVE_HEAD(&dll_chain, next); 170 return (t); 171} 172#endif /* !_KERNEL */ 173