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
36int 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