[1770] | 1 | /* vi: set sw=4 ts=4: */
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[821] | 2 | /*
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| 3 | * ll_map.c
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| 4 | *
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| 5 | * This program is free software; you can redistribute it and/or
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| 6 | * modify it under the terms of the GNU General Public License
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| 7 | * as published by the Free Software Foundation; either version
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| 8 | * 2 of the License, or (at your option) any later version.
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| 9 | *
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| 10 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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| 11 | *
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| 12 | */
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| 13 |
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[1770] | 14 | #include <net/if.h> /* struct ifreq and co. */
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| 15 |
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[821] | 16 | #include "libbb.h"
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| 17 | #include "libnetlink.h"
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| 18 | #include "ll_map.h"
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| 19 |
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[1770] | 20 | struct idxmap {
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| 21 | struct idxmap *next;
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| 22 | int index;
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| 23 | int type;
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| 24 | int alen;
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| 25 | unsigned flags;
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| 26 | unsigned char addr[8];
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| 27 | char name[16];
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[821] | 28 | };
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| 29 |
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| 30 | static struct idxmap *idxmap[16];
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| 31 |
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[1770] | 32 | static struct idxmap *find_by_index(int idx)
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| 33 | {
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| 34 | struct idxmap *im;
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| 35 |
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| 36 | for (im = idxmap[idx & 0xF]; im; im = im->next)
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| 37 | if (im->index == idx)
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| 38 | return im;
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| 39 | return NULL;
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| 40 | }
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| 41 |
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[821] | 42 | int ll_remember_index(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
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| 43 | {
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| 44 | int h;
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| 45 | struct ifinfomsg *ifi = NLMSG_DATA(n);
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| 46 | struct idxmap *im, **imp;
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| 47 | struct rtattr *tb[IFLA_MAX+1];
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| 48 |
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| 49 | if (n->nlmsg_type != RTM_NEWLINK)
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| 50 | return 0;
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| 51 |
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| 52 | if (n->nlmsg_len < NLMSG_LENGTH(sizeof(ifi)))
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| 53 | return -1;
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| 54 |
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| 55 | memset(tb, 0, sizeof(tb));
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| 56 | parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), IFLA_PAYLOAD(n));
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| 57 | if (tb[IFLA_IFNAME] == NULL)
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| 58 | return 0;
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| 59 |
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[1770] | 60 | h = ifi->ifi_index & 0xF;
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[821] | 61 |
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[1770] | 62 | for (imp = &idxmap[h]; (im = *imp) != NULL; imp = &im->next)
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[821] | 63 | if (im->index == ifi->ifi_index)
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[1770] | 64 | goto found;
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[821] | 65 |
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[1770] | 66 | im = xmalloc(sizeof(*im));
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| 67 | im->next = *imp;
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| 68 | im->index = ifi->ifi_index;
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| 69 | *imp = im;
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| 70 | found:
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[821] | 71 | im->type = ifi->ifi_type;
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| 72 | im->flags = ifi->ifi_flags;
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| 73 | if (tb[IFLA_ADDRESS]) {
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| 74 | int alen;
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| 75 | im->alen = alen = RTA_PAYLOAD(tb[IFLA_ADDRESS]);
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| 76 | if (alen > sizeof(im->addr))
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| 77 | alen = sizeof(im->addr);
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| 78 | memcpy(im->addr, RTA_DATA(tb[IFLA_ADDRESS]), alen);
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| 79 | } else {
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| 80 | im->alen = 0;
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| 81 | memset(im->addr, 0, sizeof(im->addr));
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| 82 | }
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| 83 | strcpy(im->name, RTA_DATA(tb[IFLA_IFNAME]));
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| 84 | return 0;
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| 85 | }
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| 86 |
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| 87 | const char *ll_idx_n2a(int idx, char *buf)
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| 88 | {
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| 89 | struct idxmap *im;
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| 90 |
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| 91 | if (idx == 0)
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| 92 | return "*";
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[1770] | 93 | im = find_by_index(idx);
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| 94 | if (im)
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| 95 | return im->name;
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[821] | 96 | snprintf(buf, 16, "if%d", idx);
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| 97 | return buf;
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| 98 | }
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| 99 |
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| 100 |
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| 101 | const char *ll_index_to_name(int idx)
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| 102 | {
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| 103 | static char nbuf[16];
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| 104 |
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| 105 | return ll_idx_n2a(idx, nbuf);
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| 106 | }
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| 107 |
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[1770] | 108 | #ifdef UNUSED
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[821] | 109 | int ll_index_to_type(int idx)
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| 110 | {
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| 111 | struct idxmap *im;
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| 112 |
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| 113 | if (idx == 0)
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| 114 | return -1;
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[1770] | 115 | im = find_by_index(idx);
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| 116 | if (im)
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| 117 | return im->type;
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[821] | 118 | return -1;
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| 119 | }
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[1770] | 120 | #endif
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[821] | 121 |
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| 122 | unsigned ll_index_to_flags(int idx)
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| 123 | {
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| 124 | struct idxmap *im;
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| 125 |
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| 126 | if (idx == 0)
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| 127 | return 0;
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[1770] | 128 | im = find_by_index(idx);
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| 129 | if (im)
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| 130 | return im->flags;
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[821] | 131 | return 0;
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| 132 | }
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| 133 |
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[1770] | 134 | int xll_name_to_index(const char *const name)
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[821] | 135 | {
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[1770] | 136 | int ret = 0;
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| 137 | int sock_fd;
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| 138 |
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| 139 | /* caching is not warranted - no users which repeatedly call it */
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| 140 | #ifdef UNUSED
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[821] | 141 | static char ncache[16];
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| 142 | static int icache;
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[1770] | 143 |
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[821] | 144 | struct idxmap *im;
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| 145 | int i;
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| 146 |
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| 147 | if (name == NULL)
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[1770] | 148 | goto out;
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| 149 | if (icache && strcmp(name, ncache) == 0) {
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| 150 | ret = icache;
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| 151 | goto out;
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| 152 | }
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| 153 | for (i = 0; i < 16; i++) {
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[821] | 154 | for (im = idxmap[i]; im; im = im->next) {
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| 155 | if (strcmp(im->name, name) == 0) {
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| 156 | icache = im->index;
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| 157 | strcpy(ncache, name);
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[1770] | 158 | ret = im->index;
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| 159 | goto out;
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[821] | 160 | }
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| 161 | }
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| 162 | }
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[1770] | 163 | /* We have not found the interface in our cache, but the kernel
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| 164 | * may still know about it. One reason is that we may be using
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| 165 | * module on-demand loading, which means that the kernel will
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| 166 | * load the module and make the interface exist only when
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| 167 | * we explicitely request it (check for dev_load() in net/core/dev.c).
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| 168 | * I can think of other similar scenario, but they are less common...
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| 169 | * Jean II */
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| 170 | #endif
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| 171 |
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| 172 | sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
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| 173 | if (sock_fd) {
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| 174 | struct ifreq ifr;
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| 175 | int tmp;
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| 176 |
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| 177 | strncpy(ifr.ifr_name, name, IFNAMSIZ);
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| 178 | ifr.ifr_ifindex = -1;
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| 179 | tmp = ioctl(sock_fd, SIOCGIFINDEX, &ifr);
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| 180 | close(sock_fd);
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| 181 | if (tmp >= 0)
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| 182 | /* In theory, we should redump the interface list
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| 183 | * to update our cache, this is left as an exercise
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| 184 | * to the reader... Jean II */
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| 185 | ret = ifr.ifr_ifindex;
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| 186 | }
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| 187 | /* out:*/
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| 188 | if (ret <= 0)
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| 189 | bb_error_msg_and_die("cannot find device \"%s\"", name);
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| 190 | return ret;
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[821] | 191 | }
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| 192 |
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| 193 | int ll_init_map(struct rtnl_handle *rth)
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| 194 | {
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[1770] | 195 | xrtnl_wilddump_request(rth, AF_UNSPEC, RTM_GETLINK);
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| 196 | xrtnl_dump_filter(rth, ll_remember_index, &idxmap);
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[821] | 197 | return 0;
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| 198 | }
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