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: Copyright (c) 2007, 2008 by Juliusz Chroboczek
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 <zebra.h>
41: #include "if.h"
42: #include "log.h"
43:
44: #include "babeld.h"
45: #include "kernel.h"
46: #include "neighbour.h"
47: #include "message.h"
48: #include "route.h"
49: #include "xroute.h"
50: #include "util.h"
51: #include "babel_interface.h"
52:
53: static int xroute_add_new_route(unsigned char prefix[16], unsigned char plen,
54: unsigned short metric, unsigned int ifindex,
55: int proto, int send_updates);
56:
57: static struct xroute *xroutes;
58: static int numxroutes = 0, maxxroutes = 0;
59:
60: /* Add redistributed route to Babel table. */
61: int
62: babel_ipv4_route_add (struct zapi_ipv4 *api, struct prefix_ipv4 *prefix,
63: unsigned int ifindex, struct in_addr *nexthop)
64: {
65: unsigned char uchar_prefix[16];
66:
67: inaddr_to_uchar(uchar_prefix, &prefix->prefix);
68: debugf(BABEL_DEBUG_ROUTE, "Adding new ipv4 route comming from Zebra.");
69: xroute_add_new_route(uchar_prefix, prefix->prefixlen + 96,
70: api->metric, ifindex, 0, 1);
71: return 0;
72: }
73:
74: /* Remove redistributed route from Babel table. */
75: int
76: babel_ipv4_route_delete (struct zapi_ipv4 *api, struct prefix_ipv4 *prefix,
77: unsigned int ifindex)
78: {
79: unsigned char uchar_prefix[16];
80: struct xroute *xroute = NULL;
81:
82: inaddr_to_uchar(uchar_prefix, &prefix->prefix);
83: xroute = find_xroute(uchar_prefix, prefix->prefixlen + 96);
84: if (xroute != NULL) {
85: debugf(BABEL_DEBUG_ROUTE, "Removing ipv4 route (from zebra).");
86: flush_xroute(xroute);
87: }
88: return 0;
89: }
90:
91: /* Add redistributed route to Babel table. */
92: int
93: babel_ipv6_route_add (struct zapi_ipv6 *api, struct prefix_ipv6 *prefix,
94: unsigned int ifindex, struct in6_addr *nexthop)
95: {
96: unsigned char uchar_prefix[16];
97:
98: in6addr_to_uchar(uchar_prefix, &prefix->prefix);
99: debugf(BABEL_DEBUG_ROUTE, "Adding new route comming from Zebra.");
100: xroute_add_new_route(uchar_prefix, prefix->prefixlen, api->metric, ifindex,
101: 0, 1);
102: return 0;
103: }
104:
105: /* Remove redistributed route from Babel table. */
106: int
107: babel_ipv6_route_delete (struct zapi_ipv6 *api, struct prefix_ipv6 *prefix,
108: unsigned int ifindex)
109: {
110: unsigned char uchar_prefix[16];
111: struct xroute *xroute = NULL;
112:
113: in6addr_to_uchar(uchar_prefix, &prefix->prefix);
114: xroute = find_xroute(uchar_prefix, prefix->prefixlen);
115: if (xroute != NULL) {
116: debugf(BABEL_DEBUG_ROUTE, "Removing route (from zebra).");
117: flush_xroute(xroute);
118: }
119: return 0;
120: }
121:
122: struct xroute *
123: find_xroute(const unsigned char *prefix, unsigned char plen)
124: {
125: int i;
126: for(i = 0; i < numxroutes; i++) {
127: if(xroutes[i].plen == plen &&
128: memcmp(xroutes[i].prefix, prefix, 16) == 0)
129: return &xroutes[i];
130: }
131: return NULL;
132: }
133:
134: void
135: flush_xroute(struct xroute *xroute)
136: {
137: int i;
138:
139: i = xroute - xroutes;
140: assert(i >= 0 && i < numxroutes);
141:
142: if(i != numxroutes - 1)
143: memcpy(xroutes + i, xroutes + numxroutes - 1, sizeof(struct xroute));
144: numxroutes--;
145: VALGRIND_MAKE_MEM_UNDEFINED(xroutes + numxroutes, sizeof(struct xroute));
146:
147: if(numxroutes == 0) {
148: free(xroutes);
149: xroutes = NULL;
150: maxxroutes = 0;
151: } else if(maxxroutes > 8 && numxroutes < maxxroutes / 4) {
152: struct xroute *new_xroutes;
153: int n = maxxroutes / 2;
154: new_xroutes = realloc(xroutes, n * sizeof(struct xroute));
155: if(new_xroutes == NULL)
156: return;
157: xroutes = new_xroutes;
158: maxxroutes = n;
159: }
160: }
161:
162: static int
163: add_xroute(unsigned char prefix[16], unsigned char plen,
164: unsigned short metric, unsigned int ifindex, int proto)
165: {
166: struct xroute *xroute = find_xroute(prefix, plen);
167: if(xroute) {
168: if(xroute->metric <= metric)
169: return 0;
170: xroute->metric = metric;
171: return 1;
172: }
173:
174: if(numxroutes >= maxxroutes) {
175: struct xroute *new_xroutes;
176: int n = maxxroutes < 1 ? 8 : 2 * maxxroutes;
177: new_xroutes = xroutes == NULL ?
178: malloc(n * sizeof(struct xroute)) :
179: realloc(xroutes, n * sizeof(struct xroute));
180: if(new_xroutes == NULL)
181: return -1;
182: maxxroutes = n;
183: xroutes = new_xroutes;
184: }
185:
186: memcpy(xroutes[numxroutes].prefix, prefix, 16);
187: xroutes[numxroutes].plen = plen;
188: xroutes[numxroutes].metric = metric;
189: xroutes[numxroutes].ifindex = ifindex;
190: xroutes[numxroutes].proto = proto;
191: numxroutes++;
192: return 1;
193: }
194:
195: /* Returns an overestimate of the number of xroutes. */
196: int
197: xroutes_estimate()
198: {
199: return numxroutes;
200: }
201:
202: void
203: for_all_xroutes(void (*f)(struct xroute*, void*), void *closure)
204: {
205: int i;
206:
207: for(i = 0; i < numxroutes; i++)
208: (*f)(&xroutes[i], closure);
209: }
210:
211: /* add an xroute, verifying some conditions; return 0 if there is no changes */
212: static int
213: xroute_add_new_route(unsigned char prefix[16], unsigned char plen,
214: unsigned short metric, unsigned int ifindex,
215: int proto, int send_updates)
216: {
217: int rc;
218: if(martian_prefix(prefix, plen))
219: return 0;
220: metric = redistribute_filter(prefix, plen, ifindex, proto);
221: if(metric < INFINITY) {
222: rc = add_xroute(prefix, plen, metric, ifindex, proto);
223: if(rc > 0) {
224: struct babel_route *route;
225: route = find_installed_route(prefix, plen);
226: if(route) {
227: if(allow_duplicates < 0 ||
228: metric < allow_duplicates)
229: uninstall_route(route);
230: }
231: if(send_updates)
232: send_update(NULL, 0, prefix, plen);
233: return 1;
234: }
235: }
236: return 0;
237: }
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