179 lines
3.5 KiB
C
179 lines
3.5 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*/
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#include <net/if.h> /* struct ifreq and co. */
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#include "libbb.h"
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#include "libnetlink.h"
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#include "ll_map.h"
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struct idxmap {
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struct idxmap *next;
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int index;
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int type;
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int alen;
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unsigned flags;
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unsigned char addr[8];
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char name[16];
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};
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static struct idxmap **idxmap; /* treat as *idxmap[16] */
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static struct idxmap *find_by_index(int idx)
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{
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struct idxmap *im;
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if (idxmap)
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for (im = idxmap[idx & 0xF]; im; im = im->next)
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if (im->index == idx)
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return im;
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return NULL;
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}
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int FAST_FUNC ll_remember_index(const struct sockaddr_nl *who UNUSED_PARAM,
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struct nlmsghdr *n,
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void *arg UNUSED_PARAM)
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{
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int h;
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struct ifinfomsg *ifi = NLMSG_DATA(n);
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struct idxmap *im, **imp;
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struct rtattr *tb[IFLA_MAX+1];
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if (n->nlmsg_type != RTM_NEWLINK)
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return 0;
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if (n->nlmsg_len < NLMSG_LENGTH(sizeof(ifi)))
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return -1;
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memset(tb, 0, sizeof(tb));
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parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), IFLA_PAYLOAD(n));
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if (tb[IFLA_IFNAME] == NULL)
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return 0;
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if (!idxmap)
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idxmap = xzalloc(sizeof(idxmap[0]) * 16);
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h = ifi->ifi_index & 0xF;
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for (imp = &idxmap[h]; (im = *imp) != NULL; imp = &im->next)
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if (im->index == ifi->ifi_index)
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goto found;
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im = xmalloc(sizeof(*im));
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im->next = *imp;
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im->index = ifi->ifi_index;
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*imp = im;
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found:
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im->type = ifi->ifi_type;
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im->flags = ifi->ifi_flags;
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if (tb[IFLA_ADDRESS]) {
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int alen;
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im->alen = alen = RTA_PAYLOAD(tb[IFLA_ADDRESS]);
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if (alen > (int)sizeof(im->addr))
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alen = sizeof(im->addr);
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memcpy(im->addr, RTA_DATA(tb[IFLA_ADDRESS]), alen);
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} else {
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im->alen = 0;
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memset(im->addr, 0, sizeof(im->addr));
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}
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strcpy(im->name, RTA_DATA(tb[IFLA_IFNAME]));
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return 0;
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}
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static
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const char FAST_FUNC *ll_idx_n2a(int idx/*, char *buf*/)
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{
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struct idxmap *im;
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if (idx == 0)
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return "*";
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im = find_by_index(idx);
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if (im)
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return im->name;
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//snprintf(buf, 16, "if%d", idx);
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//return buf;
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return auto_string(xasprintf("if%d", idx));
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}
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const char FAST_FUNC *ll_index_to_name(int idx)
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{
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//static char nbuf[16];
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return ll_idx_n2a(idx/*, nbuf*/);
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}
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#ifdef UNUSED
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int ll_index_to_type(int idx)
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{
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struct idxmap *im;
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if (idx == 0)
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return -1;
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im = find_by_index(idx);
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if (im)
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return im->type;
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return -1;
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}
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#endif
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unsigned FAST_FUNC ll_index_to_flags(int idx)
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{
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struct idxmap *im;
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if (idx == 0)
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return 0;
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im = find_by_index(idx);
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if (im)
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return im->flags;
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return 0;
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}
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int FAST_FUNC xll_name_to_index(const char *name)
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{
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int ret = 0;
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/* caching is not warranted - no users which repeatedly call it */
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#ifdef UNUSED
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static char ncache[16];
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static int icache;
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struct idxmap *im;
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int i;
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if (name == NULL)
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goto out;
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if (icache && strcmp(name, ncache) == 0) {
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ret = icache;
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goto out;
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}
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if (idxmap) {
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for (i = 0; i < 16; i++) {
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for (im = idxmap[i]; im; im = im->next) {
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if (strcmp(im->name, name) == 0) {
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icache = im->index;
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strcpy(ncache, name);
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ret = im->index;
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goto out;
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}
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}
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}
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}
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#endif
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ret = if_nametoindex(name);
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/* out:*/
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if (ret <= 0)
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bb_error_msg_and_die("can't find device '%s'", name);
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return ret;
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}
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int FAST_FUNC ll_init_map(struct rtnl_handle *rth)
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{
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xrtnl_wilddump_request(rth, AF_UNSPEC, RTM_GETLINK);
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xrtnl_dump_filter(rth, ll_remember_index, NULL);
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return 0;
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}
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