+/* vi: set sw=4 ts=4: */
/*
- * ll_map.c
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- *
- * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
*
+ * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
*/
-#include "libbb.h"
-#include <string.h>
+#include <net/if.h> /* struct ifreq and co. */
+#include "libbb.h"
#include "libnetlink.h"
#include "ll_map.h"
-struct idxmap
-{
- struct idxmap * next;
- int index;
- int type;
- int alen;
- unsigned flags;
- unsigned char addr[8];
- char name[16];
+struct idxmap {
+ struct idxmap *next;
+ int index;
+ int type;
+ int alen;
+ unsigned flags;
+ unsigned char addr[8];
+ char name[16];
};
-static struct idxmap *idxmap[16];
+static struct idxmap **idxmap; /* treat as *idxmap[16] */
+
+static struct idxmap *find_by_index(int idx)
+{
+ struct idxmap *im;
+
+ if (idxmap)
+ for (im = idxmap[idx & 0xF]; im; im = im->next)
+ if (im->index == idx)
+ return im;
+ return NULL;
+}
-int ll_remember_index(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
+int FAST_FUNC ll_remember_index(const struct sockaddr_nl *who UNUSED_PARAM,
+ struct nlmsghdr *n,
+ void *arg UNUSED_PARAM)
{
int h;
struct ifinfomsg *ifi = NLMSG_DATA(n);
if (n->nlmsg_len < NLMSG_LENGTH(sizeof(ifi)))
return -1;
-
memset(tb, 0, sizeof(tb));
parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), IFLA_PAYLOAD(n));
if (tb[IFLA_IFNAME] == NULL)
return 0;
- h = ifi->ifi_index&0xF;
+ if (!idxmap)
+ idxmap = xzalloc(sizeof(idxmap[0]) * 16);
- for (imp=&idxmap[h]; (im=*imp)!=NULL; imp = &im->next)
+ h = ifi->ifi_index & 0xF;
+ for (imp = &idxmap[h]; (im = *imp) != NULL; imp = &im->next)
if (im->index == ifi->ifi_index)
- break;
-
- if (im == NULL) {
- im = xmalloc(sizeof(*im));
- im->next = *imp;
- im->index = ifi->ifi_index;
- *imp = im;
- }
+ goto found;
+ im = xmalloc(sizeof(*im));
+ im->next = *imp;
+ im->index = ifi->ifi_index;
+ *imp = im;
+ found:
im->type = ifi->ifi_type;
im->flags = ifi->ifi_flags;
if (tb[IFLA_ADDRESS]) {
int alen;
im->alen = alen = RTA_PAYLOAD(tb[IFLA_ADDRESS]);
- if (alen > sizeof(im->addr))
+ if (alen > (int)sizeof(im->addr))
alen = sizeof(im->addr);
memcpy(im->addr, RTA_DATA(tb[IFLA_ADDRESS]), alen);
} else {
return 0;
}
-const char *ll_idx_n2a(int idx, char *buf)
+const char FAST_FUNC *ll_idx_n2a(int idx, char *buf)
{
struct idxmap *im;
if (idx == 0)
return "*";
- for (im = idxmap[idx&0xF]; im; im = im->next)
- if (im->index == idx)
- return im->name;
+ im = find_by_index(idx);
+ if (im)
+ return im->name;
snprintf(buf, 16, "if%d", idx);
return buf;
}
-const char *ll_index_to_name(int idx)
+const char FAST_FUNC *ll_index_to_name(int idx)
{
static char nbuf[16];
return ll_idx_n2a(idx, nbuf);
}
+#ifdef UNUSED
int ll_index_to_type(int idx)
{
struct idxmap *im;
if (idx == 0)
return -1;
- for (im = idxmap[idx&0xF]; im; im = im->next)
- if (im->index == idx)
- return im->type;
+ im = find_by_index(idx);
+ if (im)
+ return im->type;
return -1;
}
+#endif
-unsigned ll_index_to_flags(int idx)
+unsigned FAST_FUNC ll_index_to_flags(int idx)
{
struct idxmap *im;
if (idx == 0)
return 0;
-
- for (im = idxmap[idx&0xF]; im; im = im->next)
- if (im->index == idx)
- return im->flags;
+ im = find_by_index(idx);
+ if (im)
+ return im->flags;
return 0;
}
-int ll_name_to_index(char *name)
+int FAST_FUNC xll_name_to_index(const char *name)
{
+ int ret = 0;
+ int sock_fd;
+
+/* caching is not warranted - no users which repeatedly call it */
+#ifdef UNUSED
static char ncache[16];
static int icache;
+
struct idxmap *im;
int i;
if (name == NULL)
- return 0;
- if (icache && strcmp(name, ncache) == 0)
- return icache;
- for (i=0; i<16; i++) {
- for (im = idxmap[i]; im; im = im->next) {
- if (strcmp(im->name, name) == 0) {
- icache = im->index;
- strcpy(ncache, name);
- return im->index;
+ goto out;
+ if (icache && strcmp(name, ncache) == 0) {
+ ret = icache;
+ goto out;
+ }
+ if (idxmap) {
+ for (i = 0; i < 16; i++) {
+ for (im = idxmap[i]; im; im = im->next) {
+ if (strcmp(im->name, name) == 0) {
+ icache = im->index;
+ strcpy(ncache, name);
+ ret = im->index;
+ goto out;
+ }
}
}
}
- return 0;
+ /* We have not found the interface in our cache, but the kernel
+ * may still know about it. One reason is that we may be using
+ * module on-demand loading, which means that the kernel will
+ * load the module and make the interface exist only when
+ * we explicitely request it (check for dev_load() in net/core/dev.c).
+ * I can think of other similar scenario, but they are less common...
+ * Jean II */
+#endif
+
+ sock_fd = socket(AF_INET, SOCK_DGRAM, 0);
+ if (sock_fd >= 0) {
+ struct ifreq ifr;
+ int tmp;
+
+ strncpy_IFNAMSIZ(ifr.ifr_name, name);
+ ifr.ifr_ifindex = -1;
+ tmp = ioctl(sock_fd, SIOCGIFINDEX, &ifr);
+ close(sock_fd);
+ if (tmp >= 0)
+ /* In theory, we should redump the interface list
+ * to update our cache, this is left as an exercise
+ * to the reader... Jean II */
+ ret = ifr.ifr_ifindex;
+ }
+/* out:*/
+ if (ret <= 0)
+ bb_error_msg_and_die("can't find device '%s'", name);
+ return ret;
}
-int ll_init_map(struct rtnl_handle *rth)
+int FAST_FUNC ll_init_map(struct rtnl_handle *rth)
{
- if (rtnl_wilddump_request(rth, AF_UNSPEC, RTM_GETLINK) < 0) {
- perror("Cannot send dump request");
- exit(1);
- }
-
- if (rtnl_dump_filter(rth, ll_remember_index, &idxmap, NULL, NULL) < 0) {
- fprintf(stderr, "Dump terminated\n");
- exit(1);
- }
+ xrtnl_wilddump_request(rth, AF_UNSPEC, RTM_GETLINK);
+ xrtnl_dump_filter(rth, ll_remember_index, NULL);
return 0;
}
projects / oweals / busybox.git / blobdiff