4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
18 #include <sys/socket.h>
19 #include <netinet/in.h>
23 #include "libnetlink.h"
26 extern unsigned int if_nametoindex (const char *);
30 struct ll_cache *idx_next;
36 unsigned char addr[20];
39 #define IDXMAP_SIZE 1024
40 static struct ll_cache *idx_head[IDXMAP_SIZE];
42 static inline struct ll_cache *idxhead(int idx)
44 return idx_head[idx & (IDXMAP_SIZE - 1)];
47 int ll_remember_index(const struct sockaddr_nl *who,
48 struct nlmsghdr *n, void *arg)
51 struct ifinfomsg *ifi = NLMSG_DATA(n);
52 struct ll_cache *im, **imp;
53 struct rtattr *tb[IFLA_MAX+1];
55 if (n->nlmsg_type != RTM_NEWLINK)
58 if (n->nlmsg_len < NLMSG_LENGTH(sizeof(ifi)))
61 memset(tb, 0, sizeof(tb));
62 parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), IFLA_PAYLOAD(n));
63 if (tb[IFLA_IFNAME] == NULL)
66 h = ifi->ifi_index & (IDXMAP_SIZE - 1);
67 for (imp = &idx_head[h]; (im=*imp)!=NULL; imp = &im->idx_next)
68 if (im->index == ifi->ifi_index)
72 im = malloc(sizeof(*im));
76 im->index = ifi->ifi_index;
80 im->type = ifi->ifi_type;
81 im->flags = ifi->ifi_flags;
82 if (tb[IFLA_ADDRESS]) {
84 im->alen = alen = RTA_PAYLOAD(tb[IFLA_ADDRESS]);
85 if (alen > sizeof(im->addr))
86 alen = sizeof(im->addr);
87 memcpy(im->addr, RTA_DATA(tb[IFLA_ADDRESS]), alen);
90 memset(im->addr, 0, sizeof(im->addr));
92 strcpy(im->name, RTA_DATA(tb[IFLA_IFNAME]));
96 const char *ll_idx_n2a(unsigned idx, char *buf)
98 const struct ll_cache *im;
103 for (im = idxhead(idx); im; im = im->idx_next)
104 if (im->index == idx)
107 snprintf(buf, IFNAMSIZ, "if%d", idx);
112 const char *ll_index_to_name(unsigned idx)
114 static char nbuf[IFNAMSIZ];
116 return ll_idx_n2a(idx, nbuf);
119 int ll_index_to_type(unsigned idx)
121 const struct ll_cache *im;
125 for (im = idxhead(idx); im; im = im->idx_next)
126 if (im->index == idx)
131 unsigned ll_index_to_flags(unsigned idx)
133 const struct ll_cache *im;
138 for (im = idxhead(idx); im; im = im->idx_next)
139 if (im->index == idx)
144 unsigned ll_index_to_addr(unsigned idx, unsigned char *addr,
147 const struct ll_cache *im;
152 for (im = idxhead(idx); im; im = im->idx_next) {
153 if (im->index == idx) {
154 if (alen > sizeof(im->addr))
155 alen = sizeof(im->addr);
158 memcpy(addr, im->addr, alen);
165 unsigned ll_name_to_index(const char *name)
167 static char ncache[IFNAMSIZ];
176 if (icache && strcmp(name, ncache) == 0)
179 for (i=0; i<IDXMAP_SIZE; i++) {
180 for (im = idx_head[i]; im; im = im->idx_next) {
181 if (strcmp(im->name, name) == 0) {
183 strcpy(ncache, name);
189 idx = if_nametoindex(name);
191 sscanf(name, "if%u", &idx);
195 int ll_init_map(struct rtnl_handle *rth)
197 static int initialized;
202 if (rtnl_wilddump_request(rth, AF_UNSPEC, RTM_GETLINK) < 0) {
203 perror("Cannot send dump request");
207 if (rtnl_dump_filter(rth, ll_remember_index, NULL) < 0) {
208 fprintf(stderr, "Dump terminated\n");