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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C)2005 USAGI/WIDE Project
*
*
* based on ip.c, iproute.c
*
* Authors:
* Masahide NAKAMURA @USAGI
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/icmp6.h>
#include "utils.h"
#include "ip_common.h"
/* prefix flags; see kernel's net/ipv6/addrconf.c and include/net/if_inet6.h */
#define IF_PREFIX_ONLINK 0x01
#define IF_PREFIX_AUTOCONF 0x02
int print_prefix(struct nlmsghdr *n, void *arg)
{
FILE *fp = (FILE *)arg;
struct prefixmsg *prefix = NLMSG_DATA(n);
int len = n->nlmsg_len;
struct rtattr *tb[RTA_MAX+1];
int family = preferred_family;
if (n->nlmsg_type != RTM_NEWPREFIX) {
fprintf(stderr, "Not a prefix: %08x %08x %08x\n",
n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
return 0;
}
len -= NLMSG_LENGTH(sizeof(*prefix));
if (len < 0) {
fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
return -1;
}
if (family == AF_UNSPEC)
family = AF_INET6;
if (family != AF_INET6)
return 0;
if (prefix->prefix_family != AF_INET6) {
fprintf(stderr, "incorrect protocol family: %d\n", prefix->prefix_family);
return 0;
}
if (prefix->prefix_type != ND_OPT_PREFIX_INFORMATION) {
fprintf(stderr, "wrong ND type %d\n", prefix->prefix_type);
return 0;
}
parse_rtattr(tb, RTA_MAX, RTM_RTA(prefix), len);
if (tb[PREFIX_ADDRESS]) {
fprintf(fp, "prefix %s/%u",
rt_addr_n2a_rta(family, tb[PREFIX_ADDRESS]),
prefix->prefix_len);
}
fprintf(fp, "dev %s ", ll_index_to_name(prefix->prefix_ifindex));
if (prefix->prefix_flags & IF_PREFIX_ONLINK)
fprintf(fp, "onlink ");
if (prefix->prefix_flags & IF_PREFIX_AUTOCONF)
fprintf(fp, "autoconf ");
if (tb[PREFIX_CACHEINFO]) {
const struct prefix_cacheinfo *pc
= RTA_DATA(tb[PREFIX_CACHEINFO]);
fprintf(fp, "valid %u ", pc->valid_time);
fprintf(fp, "preferred %u ", pc->preferred_time);
}
fprintf(fp, "\n");
fflush(fp);
return 0;
}
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