1/* 2 * This file is free software: you may copy, redistribute and/or modify it 3 * under the terms of the GNU General Public License as published by the 4 * Free Software Foundation, either version 2 of the License, or (at your 5 * option) any later version. 6 * 7 * This file is distributed in the hope that it will be useful, but 8 * WITHOUT ANY WARRANTY; without even the implied warranty of 9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 10 * General Public License for more details. 11 * 12 * You should have received a copy of the GNU General Public License 13 * along with this program. If not, see <http://www.gnu.org/licenses/>. 14 * 15 * This file incorporates work covered by the following copyright and 16 * permission notice: 17 * 18 19Copyright 2011 by Matthieu Boutier and Juliusz Chroboczek 20 21Permission is hereby granted, free of charge, to any person obtaining a copy 22of this software and associated documentation files (the "Software"), to deal 23in the Software without restriction, including without limitation the rights 24to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 25copies of the Software, and to permit persons to whom the Software is 26furnished to do so, subject to the following conditions: 27 28The above copyright notice and this permission notice shall be included in 29all copies or substantial portions of the Software. 30 31THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 32IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 33FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 34AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 35LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 36OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 37THE SOFTWARE. 38*/ 39 40#include "babel_filter.h" 41#include "vty.h" 42#include "filter.h" 43#include "log.h" 44#include "plist.h" 45#include "distribute.h" 46#include "util.h" 47 48int 49babel_filter(int output, const unsigned char *prefix, unsigned short plen, 50 unsigned int ifindex) 51{ 52 struct interface *ifp = if_lookup_by_index(ifindex); 53 babel_interface_nfo *babel_ifp = ifp ? babel_get_if_nfo(ifp) : NULL; 54 struct prefix p; 55 struct distribute *dist; 56 struct access_list *alist; 57 struct prefix_list *plist; 58 int filter = output ? BABEL_FILTER_OUT : BABEL_FILTER_IN; 59 int distribute = output ? DISTRIBUTE_OUT : DISTRIBUTE_IN; 60 61 p.family = v4mapped(prefix) ? AF_INET : AF_INET6; 62 p.prefixlen = v4mapped(prefix) ? plen - 96 : plen; 63 if (p.family == AF_INET) 64 uchar_to_inaddr(&p.u.prefix4, prefix); 65 else 66 uchar_to_in6addr(&p.u.prefix6, prefix); 67 68 if (babel_ifp != NULL && babel_ifp->list[filter]) { 69 if (access_list_apply (babel_ifp->list[filter], &p) 70 == FILTER_DENY) { 71 debugf(BABEL_DEBUG_FILTER, 72 "%s/%d filtered by distribute in", 73 p.family == AF_INET ? 74 inet_ntoa(p.u.prefix4) : 75 inet6_ntoa (p.u.prefix6), 76 p.prefixlen); 77 return INFINITY; 78 } 79 } 80 if (babel_ifp != NULL && babel_ifp->prefix[filter]) { 81 if (prefix_list_apply (babel_ifp->prefix[filter], &p) 82 == PREFIX_DENY) { 83 debugf(BABEL_DEBUG_FILTER, "%s/%d filtered by distribute in", 84 p.family == AF_INET ? 85 inet_ntoa(p.u.prefix4) : 86 inet6_ntoa (p.u.prefix6), 87 p.prefixlen); 88 return INFINITY; 89 } 90 } 91 92 /* All interface filter check. */ 93 dist = distribute_lookup (NULL); 94 if (dist) { 95 if (dist->list[distribute]) { 96 alist = access_list_lookup (AFI_IP6, dist->list[distribute]); 97 98 if (alist) { 99 if (access_list_apply (alist, &p) == FILTER_DENY) { 100 debugf(BABEL_DEBUG_FILTER, "%s/%d filtered by distribute in", 101 p.family == AF_INET ? 102 inet_ntoa(p.u.prefix4) : 103 inet6_ntoa (p.u.prefix6), 104 p.prefixlen); 105 return INFINITY; 106 } 107 } 108 } 109 if (dist->prefix[distribute]) { 110 plist = prefix_list_lookup (AFI_IP6, dist->prefix[distribute]); 111 if (plist) { 112 if (prefix_list_apply (plist, &p) == PREFIX_DENY) { 113 debugf(BABEL_DEBUG_FILTER, "%s/%d filtered by distribute in", 114 p.family == AF_INET ? 115 inet_ntoa(p.u.prefix4) : 116 inet6_ntoa (p.u.prefix6), 117 p.prefixlen); 118 return INFINITY; 119 } 120 } 121 } 122 } 123 return 0; 124} 125