osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 1 | /* |
| 2 | * ll_map.c |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version |
| 7 | * 2 of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
| 10 | * |
| 11 | */ |
| 12 | |
| 13 | #include <stdio.h> |
| 14 | #include <stdlib.h> |
| 15 | #include <unistd.h> |
| 16 | #include <syslog.h> |
| 17 | #include <fcntl.h> |
| 18 | #include <sys/socket.h> |
| 19 | #include <netinet/in.h> |
| 20 | #include <string.h> |
Stephen Hemminger | 5f21823 | 2013-03-27 09:28:58 -0700 | [diff] [blame] | 21 | #include <net/if.h> |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 22 | |
| 23 | #include "libnetlink.h" |
| 24 | #include "ll_map.h" |
Stephen Hemminger | 0025e5d | 2013-03-28 14:57:28 -0700 | [diff] [blame] | 25 | #include "hlist.h" |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 26 | |
Stephen Hemminger | 0025e5d | 2013-03-28 14:57:28 -0700 | [diff] [blame] | 27 | struct ll_cache { |
| 28 | struct hlist_node idx_hash; |
| 29 | struct hlist_node name_hash; |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 30 | unsigned flags; |
Stephen Hemminger | 656111b | 2014-08-04 10:30:35 -0700 | [diff] [blame] | 31 | unsigned index; |
Stephen Hemminger | 4b3385f | 2010-12-10 11:49:29 -0800 | [diff] [blame] | 32 | unsigned short type; |
Stephen Hemminger | 4b3385f | 2010-12-10 11:49:29 -0800 | [diff] [blame] | 33 | char name[IFNAMSIZ]; |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 34 | }; |
| 35 | |
Stephen Hemminger | 1e21ea7 | 2010-12-10 09:46:24 -0800 | [diff] [blame] | 36 | #define IDXMAP_SIZE 1024 |
Stephen Hemminger | 0025e5d | 2013-03-28 14:57:28 -0700 | [diff] [blame] | 37 | static struct hlist_head idx_head[IDXMAP_SIZE]; |
| 38 | static struct hlist_head name_head[IDXMAP_SIZE]; |
Stephen Hemminger | 4b3385f | 2010-12-10 11:49:29 -0800 | [diff] [blame] | 39 | |
Stephen Hemminger | 0025e5d | 2013-03-28 14:57:28 -0700 | [diff] [blame] | 40 | static struct ll_cache *ll_get_by_index(unsigned index) |
Stephen Hemminger | 4b3385f | 2010-12-10 11:49:29 -0800 | [diff] [blame] | 41 | { |
Stephen Hemminger | 0025e5d | 2013-03-28 14:57:28 -0700 | [diff] [blame] | 42 | struct hlist_node *n; |
| 43 | unsigned h = index & (IDXMAP_SIZE - 1); |
| 44 | |
| 45 | hlist_for_each(n, &idx_head[h]) { |
| 46 | struct ll_cache *im |
| 47 | = container_of(n, struct ll_cache, idx_hash); |
| 48 | if (im->index == index) |
| 49 | return im; |
| 50 | } |
| 51 | |
| 52 | return NULL; |
| 53 | } |
| 54 | |
Nicolas Dichtel | d652ccb | 2015-04-15 14:23:22 +0200 | [diff] [blame] | 55 | unsigned namehash(const char *str) |
Stephen Hemminger | 0025e5d | 2013-03-28 14:57:28 -0700 | [diff] [blame] | 56 | { |
| 57 | unsigned hash = 5381; |
| 58 | |
| 59 | while (*str) |
| 60 | hash = ((hash << 5) + hash) + *str++; /* hash * 33 + c */ |
| 61 | |
| 62 | return hash; |
| 63 | } |
| 64 | |
| 65 | static struct ll_cache *ll_get_by_name(const char *name) |
| 66 | { |
| 67 | struct hlist_node *n; |
| 68 | unsigned h = namehash(name) & (IDXMAP_SIZE - 1); |
| 69 | |
| 70 | hlist_for_each(n, &name_head[h]) { |
| 71 | struct ll_cache *im |
| 72 | = container_of(n, struct ll_cache, name_hash); |
| 73 | |
| 74 | if (strncmp(im->name, name, IFNAMSIZ) == 0) |
| 75 | return im; |
| 76 | } |
| 77 | |
| 78 | return NULL; |
Stephen Hemminger | 4b3385f | 2010-12-10 11:49:29 -0800 | [diff] [blame] | 79 | } |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 80 | |
Stephen Hemminger | ae665a5 | 2006-12-05 10:10:22 -0800 | [diff] [blame] | 81 | int ll_remember_index(const struct sockaddr_nl *who, |
osdl.net!shemminger | 50772dc | 2004-12-07 21:48:29 +0000 | [diff] [blame] | 82 | struct nlmsghdr *n, void *arg) |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 83 | { |
Stephen Hemminger | 0025e5d | 2013-03-28 14:57:28 -0700 | [diff] [blame] | 84 | unsigned int h; |
| 85 | const char *ifname; |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 86 | struct ifinfomsg *ifi = NLMSG_DATA(n); |
Stephen Hemminger | 0025e5d | 2013-03-28 14:57:28 -0700 | [diff] [blame] | 87 | struct ll_cache *im; |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 88 | struct rtattr *tb[IFLA_MAX+1]; |
| 89 | |
Stephen Hemminger | 0025e5d | 2013-03-28 14:57:28 -0700 | [diff] [blame] | 90 | if (n->nlmsg_type != RTM_NEWLINK && n->nlmsg_type != RTM_DELLINK) |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 91 | return 0; |
| 92 | |
| 93 | if (n->nlmsg_len < NLMSG_LENGTH(sizeof(ifi))) |
| 94 | return -1; |
| 95 | |
Stephen Hemminger | 0025e5d | 2013-03-28 14:57:28 -0700 | [diff] [blame] | 96 | im = ll_get_by_index(ifi->ifi_index); |
| 97 | if (n->nlmsg_type == RTM_DELLINK) { |
| 98 | if (im) { |
| 99 | hlist_del(&im->name_hash); |
| 100 | hlist_del(&im->idx_hash); |
| 101 | free(im); |
| 102 | } |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 103 | return 0; |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 104 | } |
| 105 | |
Stephen Hemminger | 0025e5d | 2013-03-28 14:57:28 -0700 | [diff] [blame] | 106 | memset(tb, 0, sizeof(tb)); |
| 107 | parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), IFLA_PAYLOAD(n)); |
| 108 | ifname = rta_getattr_str(tb[IFLA_IFNAME]); |
| 109 | if (ifname == NULL) |
| 110 | return 0; |
| 111 | |
| 112 | if (im) { |
| 113 | /* change to existing entry */ |
| 114 | if (strcmp(im->name, ifname) != 0) { |
| 115 | hlist_del(&im->name_hash); |
| 116 | h = namehash(ifname) & (IDXMAP_SIZE - 1); |
| 117 | hlist_add_head(&im->name_hash, &name_head[h]); |
| 118 | } |
| 119 | |
| 120 | im->flags = ifi->ifi_flags; |
| 121 | return 0; |
| 122 | } |
| 123 | |
| 124 | im = malloc(sizeof(*im)); |
| 125 | if (im == NULL) |
| 126 | return 0; |
| 127 | im->index = ifi->ifi_index; |
| 128 | strcpy(im->name, ifname); |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 129 | im->type = ifi->ifi_type; |
| 130 | im->flags = ifi->ifi_flags; |
Stephen Hemminger | 0025e5d | 2013-03-28 14:57:28 -0700 | [diff] [blame] | 131 | |
| 132 | h = ifi->ifi_index & (IDXMAP_SIZE - 1); |
| 133 | hlist_add_head(&im->idx_hash, &idx_head[h]); |
| 134 | |
| 135 | h = namehash(ifname) & (IDXMAP_SIZE - 1); |
| 136 | hlist_add_head(&im->name_hash, &name_head[h]); |
| 137 | |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 138 | return 0; |
| 139 | } |
| 140 | |
shemminger | 99f830d | 2005-06-07 22:15:48 +0000 | [diff] [blame] | 141 | const char *ll_idx_n2a(unsigned idx, char *buf) |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 142 | { |
Stephen Hemminger | 4b3385f | 2010-12-10 11:49:29 -0800 | [diff] [blame] | 143 | const struct ll_cache *im; |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 144 | |
| 145 | if (idx == 0) |
| 146 | return "*"; |
Stephen Hemminger | 1e21ea7 | 2010-12-10 09:46:24 -0800 | [diff] [blame] | 147 | |
Stephen Hemminger | 0025e5d | 2013-03-28 14:57:28 -0700 | [diff] [blame] | 148 | im = ll_get_by_index(idx); |
| 149 | if (im) |
| 150 | return im->name; |
Stephen Hemminger | 4b3385f | 2010-12-10 11:49:29 -0800 | [diff] [blame] | 151 | |
Stephen Hemminger | 0025e5d | 2013-03-28 14:57:28 -0700 | [diff] [blame] | 152 | if (if_indextoname(idx, buf) == NULL) |
| 153 | snprintf(buf, IFNAMSIZ, "if%d", idx); |
| 154 | |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 155 | return buf; |
| 156 | } |
| 157 | |
shemminger | 99f830d | 2005-06-07 22:15:48 +0000 | [diff] [blame] | 158 | const char *ll_index_to_name(unsigned idx) |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 159 | { |
Stephen Hemminger | 4b3385f | 2010-12-10 11:49:29 -0800 | [diff] [blame] | 160 | static char nbuf[IFNAMSIZ]; |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 161 | |
| 162 | return ll_idx_n2a(idx, nbuf); |
| 163 | } |
| 164 | |
shemminger | 99f830d | 2005-06-07 22:15:48 +0000 | [diff] [blame] | 165 | int ll_index_to_type(unsigned idx) |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 166 | { |
Stephen Hemminger | 4b3385f | 2010-12-10 11:49:29 -0800 | [diff] [blame] | 167 | const struct ll_cache *im; |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 168 | |
| 169 | if (idx == 0) |
| 170 | return -1; |
Stephen Hemminger | 0025e5d | 2013-03-28 14:57:28 -0700 | [diff] [blame] | 171 | |
| 172 | im = ll_get_by_index(idx); |
| 173 | return im ? im->type : -1; |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 174 | } |
| 175 | |
Stephen Hemminger | 656111b | 2014-08-04 10:30:35 -0700 | [diff] [blame] | 176 | int ll_index_to_flags(unsigned idx) |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 177 | { |
Stephen Hemminger | 4b3385f | 2010-12-10 11:49:29 -0800 | [diff] [blame] | 178 | const struct ll_cache *im; |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 179 | |
| 180 | if (idx == 0) |
| 181 | return 0; |
| 182 | |
Stephen Hemminger | 0025e5d | 2013-03-28 14:57:28 -0700 | [diff] [blame] | 183 | im = ll_get_by_index(idx); |
| 184 | return im ? im->flags : -1; |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 185 | } |
| 186 | |
shemminger | 99f830d | 2005-06-07 22:15:48 +0000 | [diff] [blame] | 187 | unsigned ll_name_to_index(const char *name) |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 188 | { |
Stephen Hemminger | 0025e5d | 2013-03-28 14:57:28 -0700 | [diff] [blame] | 189 | const struct ll_cache *im; |
Florian Westphal | 24abb62 | 2010-05-07 11:31:02 +0000 | [diff] [blame] | 190 | unsigned idx; |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 191 | |
| 192 | if (name == NULL) |
| 193 | return 0; |
Stephen Hemminger | 4b3385f | 2010-12-10 11:49:29 -0800 | [diff] [blame] | 194 | |
Stephen Hemminger | 0025e5d | 2013-03-28 14:57:28 -0700 | [diff] [blame] | 195 | im = ll_get_by_name(name); |
| 196 | if (im) |
| 197 | return im->index; |
shemminger | 99f830d | 2005-06-07 22:15:48 +0000 | [diff] [blame] | 198 | |
Florian Westphal | 24abb62 | 2010-05-07 11:31:02 +0000 | [diff] [blame] | 199 | idx = if_nametoindex(name); |
| 200 | if (idx == 0) |
| 201 | sscanf(name, "if%u", &idx); |
| 202 | return idx; |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 203 | } |
| 204 | |
Stephen Hemminger | 0025e5d | 2013-03-28 14:57:28 -0700 | [diff] [blame] | 205 | void ll_init_map(struct rtnl_handle *rth) |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 206 | { |
Octavian Purdila | 3056423 | 2010-12-10 16:59:50 +0200 | [diff] [blame] | 207 | static int initialized; |
| 208 | |
| 209 | if (initialized) |
Stephen Hemminger | 0025e5d | 2013-03-28 14:57:28 -0700 | [diff] [blame] | 210 | return; |
Octavian Purdila | 3056423 | 2010-12-10 16:59:50 +0200 | [diff] [blame] | 211 | |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 212 | if (rtnl_wilddump_request(rth, AF_UNSPEC, RTM_GETLINK) < 0) { |
| 213 | perror("Cannot send dump request"); |
| 214 | exit(1); |
| 215 | } |
| 216 | |
Stephen Hemminger | cd70f3f | 2011-12-28 10:37:12 -0800 | [diff] [blame] | 217 | if (rtnl_dump_filter(rth, ll_remember_index, NULL) < 0) { |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 218 | fprintf(stderr, "Dump terminated\n"); |
| 219 | exit(1); |
| 220 | } |
Octavian Purdila | 3056423 | 2010-12-10 16:59:50 +0200 | [diff] [blame] | 221 | |
| 222 | initialized = 1; |
osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame] | 223 | } |