1 /*
2 * Copyright (C)2005 USAGI/WIDE Project
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 */
18 /*
19 * based on ip.c, iproute.c
20 */
21 /*
22 * Authors:
23 * Masahide NAKAMURA @USAGI
24 */
25
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <netinet/icmp6.h>
30 #include "utils.h"
31
32 /* prefix flags; see kernel's net/ipv6/addrconf.c and include/net/if_inet6.h */
33 #define IF_PREFIX_ONLINK 0x01
34 #define IF_PREFIX_AUTOCONF 0x02
35
print_prefix(const struct sockaddr_nl * who,struct nlmsghdr * n,void * arg)36 int print_prefix(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
37 {
38 FILE *fp = (FILE*)arg;
39 struct prefixmsg *prefix = NLMSG_DATA(n);
40 int len = n->nlmsg_len;
41 struct rtattr * tb[RTA_MAX+1];
42 int family = preferred_family;
43
44 if (n->nlmsg_type != RTM_NEWPREFIX) {
45 fprintf(stderr, "Not a prefix: %08x %08x %08x\n",
46 n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
47 return 0;
48 }
49
50 len -= NLMSG_LENGTH(sizeof(*prefix));
51 if (len < 0) {
52 fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
53 return -1;
54 }
55
56 if (family == AF_UNSPEC)
57 family = AF_INET6;
58 if (family != AF_INET6)
59 return 0;
60
61 if (prefix->prefix_family != AF_INET6) {
62 fprintf(stderr, "wrong family %d\n", prefix->prefix_family);
63 return 0;
64 }
65 if (prefix->prefix_type != ND_OPT_PREFIX_INFORMATION) {
66 fprintf(stderr, "wrong ND type %d\n", prefix->prefix_type);
67 return 0;
68 }
69
70 parse_rtattr(tb, RTA_MAX, RTM_RTA(prefix), len);
71
72 fprintf(fp, "prefix ");
73
74 if (tb[PREFIX_ADDRESS]) {
75 struct in6_addr *pfx;
76 char abuf[256];
77
78 pfx = (struct in6_addr *)RTA_DATA(tb[PREFIX_ADDRESS]);
79
80 memset(abuf, '\0', sizeof(abuf));
81 fprintf(fp, "%s", rt_addr_n2a(family, sizeof(*pfx), pfx,
82 abuf, sizeof(abuf)));
83 }
84 fprintf(fp, "/%u ", prefix->prefix_len);
85
86 fprintf(fp, "dev %s ", ll_index_to_name(prefix->prefix_ifindex));
87
88 if (prefix->prefix_flags & IF_PREFIX_ONLINK)
89 fprintf(fp, "onlink ");
90 if (prefix->prefix_flags & IF_PREFIX_AUTOCONF)
91 fprintf(fp, "autoconf ");
92
93 if (tb[PREFIX_CACHEINFO]) {
94 struct prefix_cacheinfo *pc;
95 pc = (struct prefix_cacheinfo *)tb[PREFIX_CACHEINFO];
96
97 fprintf(fp, "valid %u ", pc->valid_time);
98 fprintf(fp, "preferred %u ", pc->preferred_time);
99 }
100
101 fprintf(fp, "\n");
102 fflush(fp);
103
104 return 0;
105 }
106
107