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
38int print_prefix(const struct sockaddr_nl *who, 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	fprintf(fp, "prefix ");
75
76	if (tb[PREFIX_ADDRESS]) {
77		struct in6_addr *pfx;
78		char abuf[256];
79
80		pfx = (struct in6_addr *)RTA_DATA(tb[PREFIX_ADDRESS]);
81
82		memset(abuf, '\0', sizeof(abuf));
83		fprintf(fp, "%s", rt_addr_n2a(family,
84					      RTA_PAYLOAD(tb[PREFIX_ADDRESS]),
85					      pfx,
86					      abuf, sizeof(abuf)));
87	}
88	fprintf(fp, "/%u ", prefix->prefix_len);
89
90	fprintf(fp, "dev %s ", ll_index_to_name(prefix->prefix_ifindex));
91
92	if (prefix->prefix_flags & IF_PREFIX_ONLINK)
93		fprintf(fp, "onlink ");
94	if (prefix->prefix_flags & IF_PREFIX_AUTOCONF)
95		fprintf(fp, "autoconf ");
96
97	if (tb[PREFIX_CACHEINFO]) {
98		struct prefix_cacheinfo *pc;
99		pc = (struct prefix_cacheinfo *)RTA_DATA(tb[PREFIX_CACHEINFO]);
100
101		fprintf(fp, "valid %u ", pc->valid_time);
102		fprintf(fp, "preferred %u ", pc->preferred_time);
103	}
104
105	fprintf(fp, "\n");
106	fflush(fp);
107
108	return 0;
109}
110