[3320] | 1 | /* vi: set sw=4 ts=4: */
|
---|
| 2 | /*
|
---|
| 3 | * This program is free software; you can redistribute it and/or
|
---|
| 4 | * modify it under the terms of the GNU General Public License
|
---|
| 5 | * as published by the Free Software Foundation; either version
|
---|
| 6 | * 2 of the License, or (at your option) any later version.
|
---|
| 7 | *
|
---|
| 8 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
|
---|
| 9 | */
|
---|
| 10 |
|
---|
| 11 | #include <net/if.h> /* struct ifreq and co. */
|
---|
| 12 |
|
---|
| 13 | #include "libbb.h"
|
---|
| 14 | #include "libnetlink.h"
|
---|
| 15 | #include "ll_map.h"
|
---|
| 16 |
|
---|
| 17 | struct idxmap {
|
---|
| 18 | struct idxmap *next;
|
---|
| 19 | int index;
|
---|
| 20 | int type;
|
---|
| 21 | int alen;
|
---|
| 22 | unsigned flags;
|
---|
| 23 | unsigned char addr[8];
|
---|
| 24 | char name[16];
|
---|
| 25 | };
|
---|
| 26 |
|
---|
| 27 | static struct idxmap **idxmap; /* treat as *idxmap[16] */
|
---|
| 28 |
|
---|
| 29 | static struct idxmap *find_by_index(int idx)
|
---|
| 30 | {
|
---|
| 31 | struct idxmap *im;
|
---|
| 32 |
|
---|
| 33 | if (idxmap)
|
---|
| 34 | for (im = idxmap[idx & 0xF]; im; im = im->next)
|
---|
| 35 | if (im->index == idx)
|
---|
| 36 | return im;
|
---|
| 37 | return NULL;
|
---|
| 38 | }
|
---|
| 39 |
|
---|
| 40 | int FAST_FUNC ll_remember_index(const struct sockaddr_nl *who UNUSED_PARAM,
|
---|
| 41 | struct nlmsghdr *n,
|
---|
| 42 | void *arg UNUSED_PARAM)
|
---|
| 43 | {
|
---|
| 44 | int h;
|
---|
| 45 | struct ifinfomsg *ifi = NLMSG_DATA(n);
|
---|
| 46 | struct idxmap *im, **imp;
|
---|
| 47 | struct rtattr *tb[IFLA_MAX+1];
|
---|
| 48 |
|
---|
| 49 | if (n->nlmsg_type != RTM_NEWLINK)
|
---|
| 50 | return 0;
|
---|
| 51 |
|
---|
| 52 | if (n->nlmsg_len < NLMSG_LENGTH(sizeof(ifi)))
|
---|
| 53 | return -1;
|
---|
| 54 |
|
---|
| 55 | memset(tb, 0, sizeof(tb));
|
---|
| 56 | parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), IFLA_PAYLOAD(n));
|
---|
| 57 | if (tb[IFLA_IFNAME] == NULL)
|
---|
| 58 | return 0;
|
---|
| 59 |
|
---|
| 60 | if (!idxmap)
|
---|
| 61 | idxmap = xzalloc(sizeof(idxmap[0]) * 16);
|
---|
| 62 |
|
---|
| 63 | h = ifi->ifi_index & 0xF;
|
---|
| 64 | for (imp = &idxmap[h]; (im = *imp) != NULL; imp = &im->next)
|
---|
| 65 | if (im->index == ifi->ifi_index)
|
---|
| 66 | goto found;
|
---|
| 67 |
|
---|
| 68 | im = xmalloc(sizeof(*im));
|
---|
| 69 | im->next = *imp;
|
---|
| 70 | im->index = ifi->ifi_index;
|
---|
| 71 | *imp = im;
|
---|
| 72 | found:
|
---|
| 73 | im->type = ifi->ifi_type;
|
---|
| 74 | im->flags = ifi->ifi_flags;
|
---|
| 75 | if (tb[IFLA_ADDRESS]) {
|
---|
| 76 | int alen;
|
---|
| 77 | im->alen = alen = RTA_PAYLOAD(tb[IFLA_ADDRESS]);
|
---|
| 78 | if (alen > (int)sizeof(im->addr))
|
---|
| 79 | alen = sizeof(im->addr);
|
---|
| 80 | memcpy(im->addr, RTA_DATA(tb[IFLA_ADDRESS]), alen);
|
---|
| 81 | } else {
|
---|
| 82 | im->alen = 0;
|
---|
| 83 | memset(im->addr, 0, sizeof(im->addr));
|
---|
| 84 | }
|
---|
| 85 | strcpy(im->name, RTA_DATA(tb[IFLA_IFNAME]));
|
---|
| 86 | return 0;
|
---|
| 87 | }
|
---|
| 88 |
|
---|
| 89 | const char FAST_FUNC *ll_idx_n2a(int idx, char *buf)
|
---|
| 90 | {
|
---|
| 91 | struct idxmap *im;
|
---|
| 92 |
|
---|
| 93 | if (idx == 0)
|
---|
| 94 | return "*";
|
---|
| 95 | im = find_by_index(idx);
|
---|
| 96 | if (im)
|
---|
| 97 | return im->name;
|
---|
| 98 | snprintf(buf, 16, "if%d", idx);
|
---|
| 99 | return buf;
|
---|
| 100 | }
|
---|
| 101 |
|
---|
| 102 |
|
---|
| 103 | const char FAST_FUNC *ll_index_to_name(int idx)
|
---|
| 104 | {
|
---|
| 105 | static char nbuf[16];
|
---|
| 106 |
|
---|
| 107 | return ll_idx_n2a(idx, nbuf);
|
---|
| 108 | }
|
---|
| 109 |
|
---|
| 110 | #ifdef UNUSED
|
---|
| 111 | int ll_index_to_type(int idx)
|
---|
| 112 | {
|
---|
| 113 | struct idxmap *im;
|
---|
| 114 |
|
---|
| 115 | if (idx == 0)
|
---|
| 116 | return -1;
|
---|
| 117 | im = find_by_index(idx);
|
---|
| 118 | if (im)
|
---|
| 119 | return im->type;
|
---|
| 120 | return -1;
|
---|
| 121 | }
|
---|
| 122 | #endif
|
---|
| 123 |
|
---|
| 124 | unsigned FAST_FUNC ll_index_to_flags(int idx)
|
---|
| 125 | {
|
---|
| 126 | struct idxmap *im;
|
---|
| 127 |
|
---|
| 128 | if (idx == 0)
|
---|
| 129 | return 0;
|
---|
| 130 | im = find_by_index(idx);
|
---|
| 131 | if (im)
|
---|
| 132 | return im->flags;
|
---|
| 133 | return 0;
|
---|
| 134 | }
|
---|
| 135 |
|
---|
| 136 | int FAST_FUNC xll_name_to_index(const char *name)
|
---|
| 137 | {
|
---|
| 138 | int ret = 0;
|
---|
| 139 | int sock_fd;
|
---|
| 140 |
|
---|
| 141 | /* caching is not warranted - no users which repeatedly call it */
|
---|
| 142 | #ifdef UNUSED
|
---|
| 143 | static char ncache[16];
|
---|
| 144 | static int icache;
|
---|
| 145 |
|
---|
| 146 | struct idxmap *im;
|
---|
| 147 | int i;
|
---|
| 148 |
|
---|
| 149 | if (name == NULL)
|
---|
| 150 | goto out;
|
---|
| 151 | if (icache && strcmp(name, ncache) == 0) {
|
---|
| 152 | ret = icache;
|
---|
| 153 | goto out;
|
---|
| 154 | }
|
---|
| 155 | if (idxmap) {
|
---|
| 156 | for (i = 0; i < 16; i++) {
|
---|
| 157 | for (im = idxmap[i]; im; im = im->next) {
|
---|
| 158 | if (strcmp(im->name, name) == 0) {
|
---|
| 159 | icache = im->index;
|
---|
| 160 | strcpy(ncache, name);
|
---|
| 161 | ret = im->index;
|
---|
| 162 | goto out;
|
---|
| 163 | }
|
---|
| 164 | }
|
---|
| 165 | }
|
---|
| 166 | }
|
---|
| 167 | /* We have not found the interface in our cache, but the kernel
|
---|
| 168 | * may still know about it. One reason is that we may be using
|
---|
| 169 | * module on-demand loading, which means that the kernel will
|
---|
| 170 | * load the module and make the interface exist only when
|
---|
| 171 | * we explicitely request it (check for dev_load() in net/core/dev.c).
|
---|
| 172 | * I can think of other similar scenario, but they are less common...
|
---|
| 173 | * Jean II */
|
---|
| 174 | #endif
|
---|
| 175 |
|
---|
| 176 | sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
|
---|
| 177 | if (sock_fd >= 0) {
|
---|
| 178 | struct ifreq ifr;
|
---|
| 179 | int tmp;
|
---|
| 180 |
|
---|
| 181 | strncpy_IFNAMSIZ(ifr.ifr_name, name);
|
---|
| 182 | ifr.ifr_ifindex = -1;
|
---|
| 183 | tmp = ioctl(sock_fd, SIOCGIFINDEX, &ifr);
|
---|
| 184 | close(sock_fd);
|
---|
| 185 | if (tmp >= 0)
|
---|
| 186 | /* In theory, we should redump the interface list
|
---|
| 187 | * to update our cache, this is left as an exercise
|
---|
| 188 | * to the reader... Jean II */
|
---|
| 189 | ret = ifr.ifr_ifindex;
|
---|
| 190 | }
|
---|
| 191 | /* out:*/
|
---|
| 192 | if (ret <= 0)
|
---|
| 193 | bb_error_msg_and_die("can't find device '%s'", name);
|
---|
| 194 | return ret;
|
---|
| 195 | }
|
---|
| 196 |
|
---|
| 197 | int FAST_FUNC ll_init_map(struct rtnl_handle *rth)
|
---|
| 198 | {
|
---|
| 199 | xrtnl_wilddump_request(rth, AF_UNSPEC, RTM_GETLINK);
|
---|
| 200 | xrtnl_dump_filter(rth, ll_remember_index, NULL);
|
---|
| 201 | return 0;
|
---|
| 202 | }
|
---|