LXR iproute2/ip/ipprefix.c

   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(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}
  99