"Robert P. J. Day" | 63fc1a9 | 2006-07-02 19:47:05 +0000 | [diff] [blame] | 1 | /* vi: set sw=4 ts=4: */ |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 2 | /* |
| 3 | * ll_map.c |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU General Public License |
| 7 | * as published by the Free Software Foundation; either version |
| 8 | * 2 of the License, or (at your option) any later version. |
| 9 | * |
| 10 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
| 11 | * |
| 12 | */ |
| 13 | |
Denis Vlasenko | 9a7d38f | 2007-05-31 22:42:12 +0000 | [diff] [blame] | 14 | #include <net/if.h> /* struct ifreq and co. */ |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 15 | |
Denis Vlasenko | 9a7d38f | 2007-05-31 22:42:12 +0000 | [diff] [blame] | 16 | #include "libbb.h" |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 17 | #include "libnetlink.h" |
Bernhard Reutner-Fischer | 1d62d3b | 2005-10-08 20:47:15 +0000 | [diff] [blame] | 18 | #include "ll_map.h" |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 19 | |
Denis Vlasenko | 7935a5a | 2006-09-30 00:18:16 +0000 | [diff] [blame] | 20 | struct idxmap { |
Denis Vlasenko | 08a6118 | 2007-06-19 12:11:20 +0000 | [diff] [blame] | 21 | struct idxmap *next; |
| 22 | int index; |
| 23 | int type; |
| 24 | int alen; |
| 25 | unsigned flags; |
| 26 | unsigned char addr[8]; |
| 27 | char name[16]; |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 28 | }; |
| 29 | |
Denys Vlasenko | 94466b8 | 2009-10-13 16:27:11 +0200 | [diff] [blame^] | 30 | static struct idxmap **idxmap; /* treat as *idxmap[16] */ |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 31 | |
Denis Vlasenko | 08a6118 | 2007-06-19 12:11:20 +0000 | [diff] [blame] | 32 | static struct idxmap *find_by_index(int idx) |
| 33 | { |
| 34 | struct idxmap *im; |
| 35 | |
Denys Vlasenko | 94466b8 | 2009-10-13 16:27:11 +0200 | [diff] [blame^] | 36 | if (idxmap) |
| 37 | for (im = idxmap[idx & 0xF]; im; im = im->next) |
| 38 | if (im->index == idx) |
| 39 | return im; |
Denis Vlasenko | 08a6118 | 2007-06-19 12:11:20 +0000 | [diff] [blame] | 40 | return NULL; |
| 41 | } |
| 42 | |
Denys Vlasenko | d5f1b1b | 2009-06-05 12:06:05 +0200 | [diff] [blame] | 43 | int FAST_FUNC ll_remember_index(const struct sockaddr_nl *who UNUSED_PARAM, |
Denis Vlasenko | 68404f1 | 2008-03-17 09:00:54 +0000 | [diff] [blame] | 44 | struct nlmsghdr *n, |
Denis Vlasenko | a60f84e | 2008-07-05 09:18:54 +0000 | [diff] [blame] | 45 | void *arg UNUSED_PARAM) |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 46 | { |
| 47 | int h; |
| 48 | struct ifinfomsg *ifi = NLMSG_DATA(n); |
| 49 | struct idxmap *im, **imp; |
| 50 | struct rtattr *tb[IFLA_MAX+1]; |
| 51 | |
| 52 | if (n->nlmsg_type != RTM_NEWLINK) |
| 53 | return 0; |
| 54 | |
| 55 | if (n->nlmsg_len < NLMSG_LENGTH(sizeof(ifi))) |
| 56 | return -1; |
| 57 | |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 58 | memset(tb, 0, sizeof(tb)); |
| 59 | parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), IFLA_PAYLOAD(n)); |
| 60 | if (tb[IFLA_IFNAME] == NULL) |
| 61 | return 0; |
| 62 | |
Denys Vlasenko | 94466b8 | 2009-10-13 16:27:11 +0200 | [diff] [blame^] | 63 | if (!idxmap) |
| 64 | idxmap = xzalloc(sizeof(idxmap[0]) * 16); |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 65 | |
Denys Vlasenko | 94466b8 | 2009-10-13 16:27:11 +0200 | [diff] [blame^] | 66 | h = ifi->ifi_index & 0xF; |
Denis Vlasenko | 540a2a1 | 2007-04-07 01:14:45 +0000 | [diff] [blame] | 67 | for (imp = &idxmap[h]; (im = *imp) != NULL; imp = &im->next) |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 68 | if (im->index == ifi->ifi_index) |
Denis Vlasenko | 08a6118 | 2007-06-19 12:11:20 +0000 | [diff] [blame] | 69 | goto found; |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 70 | |
Denis Vlasenko | 08a6118 | 2007-06-19 12:11:20 +0000 | [diff] [blame] | 71 | im = xmalloc(sizeof(*im)); |
| 72 | im->next = *imp; |
| 73 | im->index = ifi->ifi_index; |
| 74 | *imp = im; |
| 75 | found: |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 76 | im->type = ifi->ifi_type; |
| 77 | im->flags = ifi->ifi_flags; |
| 78 | if (tb[IFLA_ADDRESS]) { |
| 79 | int alen; |
| 80 | im->alen = alen = RTA_PAYLOAD(tb[IFLA_ADDRESS]); |
Denis Vlasenko | 6b06cb8 | 2008-05-15 21:30:45 +0000 | [diff] [blame] | 81 | if (alen > (int)sizeof(im->addr)) |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 82 | alen = sizeof(im->addr); |
| 83 | memcpy(im->addr, RTA_DATA(tb[IFLA_ADDRESS]), alen); |
| 84 | } else { |
| 85 | im->alen = 0; |
| 86 | memset(im->addr, 0, sizeof(im->addr)); |
| 87 | } |
| 88 | strcpy(im->name, RTA_DATA(tb[IFLA_IFNAME])); |
| 89 | return 0; |
| 90 | } |
| 91 | |
Denys Vlasenko | d5f1b1b | 2009-06-05 12:06:05 +0200 | [diff] [blame] | 92 | const char FAST_FUNC *ll_idx_n2a(int idx, char *buf) |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 93 | { |
| 94 | struct idxmap *im; |
| 95 | |
| 96 | if (idx == 0) |
| 97 | return "*"; |
Denis Vlasenko | 08a6118 | 2007-06-19 12:11:20 +0000 | [diff] [blame] | 98 | im = find_by_index(idx); |
| 99 | if (im) |
| 100 | return im->name; |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 101 | snprintf(buf, 16, "if%d", idx); |
| 102 | return buf; |
| 103 | } |
| 104 | |
| 105 | |
Denys Vlasenko | d5f1b1b | 2009-06-05 12:06:05 +0200 | [diff] [blame] | 106 | const char FAST_FUNC *ll_index_to_name(int idx) |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 107 | { |
| 108 | static char nbuf[16]; |
| 109 | |
| 110 | return ll_idx_n2a(idx, nbuf); |
| 111 | } |
| 112 | |
Denis Vlasenko | 08a6118 | 2007-06-19 12:11:20 +0000 | [diff] [blame] | 113 | #ifdef UNUSED |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 114 | int ll_index_to_type(int idx) |
| 115 | { |
| 116 | struct idxmap *im; |
| 117 | |
| 118 | if (idx == 0) |
| 119 | return -1; |
Denis Vlasenko | 08a6118 | 2007-06-19 12:11:20 +0000 | [diff] [blame] | 120 | im = find_by_index(idx); |
| 121 | if (im) |
| 122 | return im->type; |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 123 | return -1; |
| 124 | } |
Denis Vlasenko | 08a6118 | 2007-06-19 12:11:20 +0000 | [diff] [blame] | 125 | #endif |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 126 | |
Denys Vlasenko | d5f1b1b | 2009-06-05 12:06:05 +0200 | [diff] [blame] | 127 | unsigned FAST_FUNC ll_index_to_flags(int idx) |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 128 | { |
| 129 | struct idxmap *im; |
| 130 | |
| 131 | if (idx == 0) |
| 132 | return 0; |
Denis Vlasenko | 08a6118 | 2007-06-19 12:11:20 +0000 | [diff] [blame] | 133 | im = find_by_index(idx); |
| 134 | if (im) |
| 135 | return im->flags; |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 136 | return 0; |
| 137 | } |
| 138 | |
Denys Vlasenko | d5f1b1b | 2009-06-05 12:06:05 +0200 | [diff] [blame] | 139 | int FAST_FUNC xll_name_to_index(const char *name) |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 140 | { |
Denis Vlasenko | 08a6118 | 2007-06-19 12:11:20 +0000 | [diff] [blame] | 141 | int ret = 0; |
| 142 | int sock_fd; |
| 143 | |
| 144 | /* caching is not warranted - no users which repeatedly call it */ |
| 145 | #ifdef UNUSED |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 146 | static char ncache[16]; |
| 147 | static int icache; |
Denis Vlasenko | 540a2a1 | 2007-04-07 01:14:45 +0000 | [diff] [blame] | 148 | |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 149 | struct idxmap *im; |
| 150 | int i; |
| 151 | |
| 152 | if (name == NULL) |
Bernhard Reutner-Fischer | b290889 | 2007-04-12 11:34:39 +0000 | [diff] [blame] | 153 | goto out; |
| 154 | if (icache && strcmp(name, ncache) == 0) { |
| 155 | ret = icache; |
| 156 | goto out; |
| 157 | } |
Denys Vlasenko | 94466b8 | 2009-10-13 16:27:11 +0200 | [diff] [blame^] | 158 | if (idxmap) { |
| 159 | for (i = 0; i < 16; i++) { |
| 160 | for (im = idxmap[i]; im; im = im->next) { |
| 161 | if (strcmp(im->name, name) == 0) { |
| 162 | icache = im->index; |
| 163 | strcpy(ncache, name); |
| 164 | ret = im->index; |
| 165 | goto out; |
| 166 | } |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 167 | } |
| 168 | } |
| 169 | } |
Denis Vlasenko | 7935a5a | 2006-09-30 00:18:16 +0000 | [diff] [blame] | 170 | /* We have not found the interface in our cache, but the kernel |
| 171 | * may still know about it. One reason is that we may be using |
| 172 | * module on-demand loading, which means that the kernel will |
| 173 | * load the module and make the interface exist only when |
| 174 | * we explicitely request it (check for dev_load() in net/core/dev.c). |
| 175 | * I can think of other similar scenario, but they are less common... |
| 176 | * Jean II */ |
Denis Vlasenko | 08a6118 | 2007-06-19 12:11:20 +0000 | [diff] [blame] | 177 | #endif |
| 178 | |
Denis Vlasenko | 7935a5a | 2006-09-30 00:18:16 +0000 | [diff] [blame] | 179 | sock_fd = socket(AF_INET, SOCK_DGRAM, 0); |
Denis Vlasenko | 12abcb3 | 2008-12-10 14:14:09 +0000 | [diff] [blame] | 180 | if (sock_fd >= 0) { |
Denis Vlasenko | 7935a5a | 2006-09-30 00:18:16 +0000 | [diff] [blame] | 181 | struct ifreq ifr; |
Bernhard Reutner-Fischer | b290889 | 2007-04-12 11:34:39 +0000 | [diff] [blame] | 182 | int tmp; |
Denis Vlasenko | 08a6118 | 2007-06-19 12:11:20 +0000 | [diff] [blame] | 183 | |
Denis Vlasenko | 360d966 | 2008-12-02 18:18:50 +0000 | [diff] [blame] | 184 | strncpy_IFNAMSIZ(ifr.ifr_name, name); |
Denis Vlasenko | 7935a5a | 2006-09-30 00:18:16 +0000 | [diff] [blame] | 185 | ifr.ifr_ifindex = -1; |
Bernhard Reutner-Fischer | b290889 | 2007-04-12 11:34:39 +0000 | [diff] [blame] | 186 | tmp = ioctl(sock_fd, SIOCGIFINDEX, &ifr); |
Denis Vlasenko | 7935a5a | 2006-09-30 00:18:16 +0000 | [diff] [blame] | 187 | close(sock_fd); |
Bernhard Reutner-Fischer | b290889 | 2007-04-12 11:34:39 +0000 | [diff] [blame] | 188 | if (tmp >= 0) |
Denis Vlasenko | 7935a5a | 2006-09-30 00:18:16 +0000 | [diff] [blame] | 189 | /* In theory, we should redump the interface list |
| 190 | * to update our cache, this is left as an exercise |
| 191 | * to the reader... Jean II */ |
Bernhard Reutner-Fischer | b290889 | 2007-04-12 11:34:39 +0000 | [diff] [blame] | 192 | ret = ifr.ifr_ifindex; |
Denis Vlasenko | 7935a5a | 2006-09-30 00:18:16 +0000 | [diff] [blame] | 193 | } |
Denis Vlasenko | 08a6118 | 2007-06-19 12:11:20 +0000 | [diff] [blame] | 194 | /* out:*/ |
Bernhard Reutner-Fischer | b290889 | 2007-04-12 11:34:39 +0000 | [diff] [blame] | 195 | if (ret <= 0) |
| 196 | bb_error_msg_and_die("cannot find device \"%s\"", name); |
| 197 | return ret; |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 198 | } |
| 199 | |
Denys Vlasenko | d5f1b1b | 2009-06-05 12:06:05 +0200 | [diff] [blame] | 200 | int FAST_FUNC ll_init_map(struct rtnl_handle *rth) |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 201 | { |
Bernhard Reutner-Fischer | b290889 | 2007-04-12 11:34:39 +0000 | [diff] [blame] | 202 | xrtnl_wilddump_request(rth, AF_UNSPEC, RTM_GETLINK); |
Denys Vlasenko | 94466b8 | 2009-10-13 16:27:11 +0200 | [diff] [blame^] | 203 | xrtnl_dump_filter(rth, ll_remember_index, NULL); |
Glenn L McGrath | 9a2d272 | 2002-11-10 01:33:55 +0000 | [diff] [blame] | 204 | return 0; |
| 205 | } |