Annotation of embedaddon/quagga/babeld/babel_filter.c, revision 1.1
1.1 ! misho 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:
! 19: Copyright 2011 by Matthieu Boutier and Juliusz Chroboczek
! 20:
! 21: Permission is hereby granted, free of charge, to any person obtaining a copy
! 22: of this software and associated documentation files (the "Software"), to deal
! 23: in the Software without restriction, including without limitation the rights
! 24: to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
! 25: copies of the Software, and to permit persons to whom the Software is
! 26: furnished to do so, subject to the following conditions:
! 27:
! 28: The above copyright notice and this permission notice shall be included in
! 29: all copies or substantial portions of the Software.
! 30:
! 31: THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
! 32: IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
! 33: FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
! 34: AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
! 35: LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
! 36: OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
! 37: THE 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:
! 48: int
! 49: babel_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: }
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