Annotation of embedaddon/quagga/babeld/babel_filter.c, revision 1.1.1.1
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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