/*
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* ll_map.c
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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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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <syslog.h>
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#include <fcntl.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <string.h>
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#include <net/if.h>
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#include "libnetlink.h"
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#include "ll_map.h"
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#include "list.h"
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struct ll_cache {
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struct hlist_node idx_hash;
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struct hlist_node name_hash;
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unsigned flags;
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unsigned index;
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unsigned short type;
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char name[];
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};
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#define IDXMAP_SIZE 1024
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static struct hlist_head idx_head[IDXMAP_SIZE];
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static struct hlist_head name_head[IDXMAP_SIZE];
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static struct ll_cache *ll_get_by_index(unsigned index)
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{
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struct hlist_node *n;
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unsigned h = index & (IDXMAP_SIZE - 1);
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hlist_for_each(n, &idx_head[h]) {
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struct ll_cache *im
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= container_of(n, struct ll_cache, idx_hash);
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if (im->index == index)
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return im;
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}
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return NULL;
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}
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unsigned namehash(const char *str)
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{
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unsigned hash = 5381;
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while (*str)
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hash = ((hash << 5) + hash) + *str++; /* hash * 33 + c */
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return hash;
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}
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static struct ll_cache *ll_get_by_name(const char *name)
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{
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struct hlist_node *n;
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unsigned h = namehash(name) & (IDXMAP_SIZE - 1);
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hlist_for_each(n, &name_head[h]) {
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struct ll_cache *im
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= container_of(n, struct ll_cache, name_hash);
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if (strncmp(im->name, name, IFNAMSIZ) == 0)
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return im;
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}
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return NULL;
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}
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int ll_remember_index(const struct sockaddr_nl *who,
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struct nlmsghdr *n, void *arg)
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{
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unsigned int h;
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const char *ifname;
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struct ifinfomsg *ifi = NLMSG_DATA(n);
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struct ll_cache *im;
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struct rtattr *tb[IFLA_MAX+1];
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if (n->nlmsg_type != RTM_NEWLINK && n->nlmsg_type != RTM_DELLINK)
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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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im = ll_get_by_index(ifi->ifi_index);
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if (n->nlmsg_type == RTM_DELLINK) {
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if (im) {
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hlist_del(&im->name_hash);
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hlist_del(&im->idx_hash);
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free(im);
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}
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return 0;
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}
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parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), IFLA_PAYLOAD(n));
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ifname = rta_getattr_str(tb[IFLA_IFNAME]);
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if (ifname == NULL)
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return 0;
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if (im) {
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/* change to existing entry */
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if (strcmp(im->name, ifname) != 0) {
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hlist_del(&im->name_hash);
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h = namehash(ifname) & (IDXMAP_SIZE - 1);
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hlist_add_head(&im->name_hash, &name_head[h]);
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}
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im->flags = ifi->ifi_flags;
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return 0;
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}
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im = malloc(sizeof(*im) + strlen(ifname) + 1);
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if (im == NULL)
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return 0;
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im->index = ifi->ifi_index;
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strcpy(im->name, ifname);
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im->type = ifi->ifi_type;
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im->flags = ifi->ifi_flags;
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h = ifi->ifi_index & (IDXMAP_SIZE - 1);
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hlist_add_head(&im->idx_hash, &idx_head[h]);
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h = namehash(ifname) & (IDXMAP_SIZE - 1);
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hlist_add_head(&im->name_hash, &name_head[h]);
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return 0;
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}
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const char *ll_idx_n2a(unsigned idx, char *buf)
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{
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const struct ll_cache *im;
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if (idx == 0)
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return "*";
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im = ll_get_by_index(idx);
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if (im)
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return im->name;
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if (if_indextoname(idx, buf) == NULL)
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snprintf(buf, IFNAMSIZ, "if%d", idx);
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return buf;
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}
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const char *ll_index_to_name(unsigned idx)
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{
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static char nbuf[IFNAMSIZ];
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return ll_idx_n2a(idx, nbuf);
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}
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int ll_index_to_type(unsigned idx)
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{
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const struct ll_cache *im;
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if (idx == 0)
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return -1;
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im = ll_get_by_index(idx);
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return im ? im->type : -1;
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}
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int ll_index_to_flags(unsigned idx)
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{
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const struct ll_cache *im;
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if (idx == 0)
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return 0;
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im = ll_get_by_index(idx);
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return im ? im->flags : -1;
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}
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unsigned ll_name_to_index(const char *name)
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{
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const struct ll_cache *im;
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unsigned idx;
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if (name == NULL)
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return 0;
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im = ll_get_by_name(name);
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if (im)
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return im->index;
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idx = if_nametoindex(name);
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if (idx == 0)
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sscanf(name, "if%u", &idx);
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return idx;
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}
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void ll_init_map(struct rtnl_handle *rth)
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{
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static int initialized;
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if (initialized)
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return;
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if (rtnl_wilddump_request(rth, AF_UNSPEC, RTM_GETLINK) < 0) {
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perror("Cannot send dump request");
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exit(1);
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}
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if (rtnl_dump_filter(rth, ll_remember_index, NULL) < 0) {
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fprintf(stderr, "Dump terminated\n");
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exit(1);
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}
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initialized = 1;
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}
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