/*
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* Copyright (C)2005 USAGI/WIDE Project
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses>.
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*/
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/*
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* based on ip.c, iproute.c
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*/
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/*
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* Authors:
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* Masahide NAKAMURA @USAGI
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <netinet/icmp6.h>
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#include "utils.h"
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#include "ip_common.h"
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/* prefix flags; see kernel's net/ipv6/addrconf.c and include/net/if_inet6.h */
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#define IF_PREFIX_ONLINK 0x01
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#define IF_PREFIX_AUTOCONF 0x02
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int print_prefix(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
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{
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FILE *fp = (FILE *)arg;
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struct prefixmsg *prefix = NLMSG_DATA(n);
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int len = n->nlmsg_len;
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struct rtattr *tb[RTA_MAX+1];
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int family = preferred_family;
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if (n->nlmsg_type != RTM_NEWPREFIX) {
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fprintf(stderr, "Not a prefix: %08x %08x %08x\n",
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n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
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return 0;
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}
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len -= NLMSG_LENGTH(sizeof(*prefix));
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if (len < 0) {
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fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
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return -1;
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}
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if (family == AF_UNSPEC)
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family = AF_INET6;
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if (family != AF_INET6)
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return 0;
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if (prefix->prefix_family != AF_INET6) {
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fprintf(stderr, "incorrect protocol family: %d\n", prefix->prefix_family);
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return 0;
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}
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if (prefix->prefix_type != ND_OPT_PREFIX_INFORMATION) {
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fprintf(stderr, "wrong ND type %d\n", prefix->prefix_type);
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return 0;
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}
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parse_rtattr(tb, RTA_MAX, RTM_RTA(prefix), len);
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if (tb[PREFIX_ADDRESS]) {
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fprintf(fp, "prefix %s/%u",
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rt_addr_n2a_rta(family, tb[PREFIX_ADDRESS]),
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prefix->prefix_len);
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}
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fprintf(fp, "dev %s ", ll_index_to_name(prefix->prefix_ifindex));
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if (prefix->prefix_flags & IF_PREFIX_ONLINK)
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fprintf(fp, "onlink ");
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if (prefix->prefix_flags & IF_PREFIX_AUTOCONF)
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fprintf(fp, "autoconf ");
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if (tb[PREFIX_CACHEINFO]) {
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const struct prefix_cacheinfo *pc
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= RTA_DATA(tb[PREFIX_CACHEINFO]);
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fprintf(fp, "valid %u ", pc->valid_time);
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fprintf(fp, "preferred %u ", pc->preferred_time);
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}
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fprintf(fp, "\n");
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fflush(fp);
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return 0;
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}
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