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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, see <http://www.gnu.org/licenses>. | |
16 | */ | |
17 | /* | |
18 | * based on ip.c, iproute.c | |
19 | */ | |
20 | /* | |
21 | * Authors: | |
22 | * Masahide NAKAMURA @USAGI | |
23 | */ | |
24 | ||
25 | #include <stdio.h> | |
26 | #include <stdlib.h> | |
27 | #include <string.h> | |
28 | #include <sys/socket.h> | |
29 | #include <netinet/icmp6.h> | |
30 | ||
31 | #include "utils.h" | |
32 | #include "ip_common.h" | |
33 | ||
34 | /* prefix flags; see kernel's net/ipv6/addrconf.c and include/net/if_inet6.h */ | |
35 | #define IF_PREFIX_ONLINK 0x01 | |
36 | #define IF_PREFIX_AUTOCONF 0x02 | |
37 | ||
38 | int print_prefix(struct nlmsghdr *n, void *arg) | |
39 | { | |
40 | FILE *fp = (FILE *)arg; | |
41 | struct prefixmsg *prefix = NLMSG_DATA(n); | |
42 | int len = n->nlmsg_len; | |
43 | struct rtattr *tb[RTA_MAX+1]; | |
44 | int family = preferred_family; | |
45 | ||
46 | if (n->nlmsg_type != RTM_NEWPREFIX) { | |
47 | fprintf(stderr, "Not a prefix: %08x %08x %08x\n", | |
48 | n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags); | |
49 | return 0; | |
50 | } | |
51 | ||
52 | len -= NLMSG_LENGTH(sizeof(*prefix)); | |
53 | if (len < 0) { | |
54 | fprintf(stderr, "BUG: wrong nlmsg len %d\n", len); | |
55 | return -1; | |
56 | } | |
57 | ||
58 | if (family == AF_UNSPEC) | |
59 | family = AF_INET6; | |
60 | if (family != AF_INET6) | |
61 | return 0; | |
62 | ||
63 | if (prefix->prefix_family != AF_INET6) { | |
64 | fprintf(stderr, "incorrect protocol family: %d\n", prefix->prefix_family); | |
65 | return 0; | |
66 | } | |
67 | if (prefix->prefix_type != ND_OPT_PREFIX_INFORMATION) { | |
68 | fprintf(stderr, "wrong ND type %d\n", prefix->prefix_type); | |
69 | return 0; | |
70 | } | |
71 | ||
72 | parse_rtattr(tb, RTA_MAX, RTM_RTA(prefix), len); | |
73 | ||
74 | if (tb[PREFIX_ADDRESS]) { | |
75 | fprintf(fp, "prefix %s/%u", | |
76 | rt_addr_n2a_rta(family, tb[PREFIX_ADDRESS]), | |
77 | prefix->prefix_len); | |
78 | } | |
79 | fprintf(fp, "dev %s ", ll_index_to_name(prefix->prefix_ifindex)); | |
80 | ||
81 | if (prefix->prefix_flags & IF_PREFIX_ONLINK) | |
82 | fprintf(fp, "onlink "); | |
83 | if (prefix->prefix_flags & IF_PREFIX_AUTOCONF) | |
84 | fprintf(fp, "autoconf "); | |
85 | ||
86 | if (tb[PREFIX_CACHEINFO]) { | |
87 | const struct prefix_cacheinfo *pc | |
88 | = RTA_DATA(tb[PREFIX_CACHEINFO]); | |
89 | ||
90 | fprintf(fp, "valid %u ", pc->valid_time); | |
91 | fprintf(fp, "preferred %u ", pc->preferred_time); | |
92 | } | |
93 | ||
94 | fprintf(fp, "\n"); | |
95 | fflush(fp); | |
96 | ||
97 | return 0; | |
98 | } |