| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame^] | 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 | |
| 36 | int 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 *)RTA_DATA(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 | |