#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
-#include <syslog.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
-#include <linux/if.h>
+#include <net/if.h>
#include "libnetlink.h"
#include "ll_map.h"
+#include "list.h"
-extern unsigned int if_nametoindex (const char *);
-
-struct ll_cache
-{
- struct ll_cache *idx_next;
+struct ll_cache {
+ struct hlist_node idx_hash;
+ struct hlist_node name_hash;
unsigned flags;
- int index;
+ unsigned index;
unsigned short type;
- char name[IFNAMSIZ];
+ char name[];
};
#define IDXMAP_SIZE 1024
-static struct ll_cache *idx_head[IDXMAP_SIZE];
+static struct hlist_head idx_head[IDXMAP_SIZE];
+static struct hlist_head name_head[IDXMAP_SIZE];
+
+static struct ll_cache *ll_get_by_index(unsigned index)
+{
+ struct hlist_node *n;
+ unsigned h = index & (IDXMAP_SIZE - 1);
+
+ hlist_for_each(n, &idx_head[h]) {
+ struct ll_cache *im
+ = container_of(n, struct ll_cache, idx_hash);
+ if (im->index == index)
+ return im;
+ }
+
+ return NULL;
+}
+
+unsigned namehash(const char *str)
+{
+ unsigned hash = 5381;
+
+ while (*str)
+ hash = ((hash << 5) + hash) + *str++; /* hash * 33 + c */
+
+ return hash;
+}
-static inline struct ll_cache *idxhead(int idx)
+static struct ll_cache *ll_get_by_name(const char *name)
{
- return idx_head[idx & (IDXMAP_SIZE - 1)];
+ struct hlist_node *n;
+ unsigned h = namehash(name) & (IDXMAP_SIZE - 1);
+
+ hlist_for_each(n, &name_head[h]) {
+ struct ll_cache *im
+ = container_of(n, struct ll_cache, name_hash);
+
+ if (strncmp(im->name, name, IFNAMSIZ) == 0)
+ return im;
+ }
+
+ return NULL;
}
-int ll_remember_index(const struct sockaddr_nl *who,
- struct nlmsghdr *n, void *arg)
+int ll_remember_index(struct nlmsghdr *n, void *arg)
{
- int h;
+ unsigned int h;
+ const char *ifname;
struct ifinfomsg *ifi = NLMSG_DATA(n);
- struct ll_cache *im, **imp;
+ struct ll_cache *im;
struct rtattr *tb[IFLA_MAX+1];
- if (n->nlmsg_type != RTM_NEWLINK)
+ if (n->nlmsg_type != RTM_NEWLINK && n->nlmsg_type != RTM_DELLINK)
return 0;
- if (n->nlmsg_len < NLMSG_LENGTH(sizeof(ifi)))
+ if (n->nlmsg_len < NLMSG_LENGTH(sizeof(*ifi)))
return -1;
- memset(tb, 0, sizeof(tb));
+ im = ll_get_by_index(ifi->ifi_index);
+ if (n->nlmsg_type == RTM_DELLINK) {
+ if (im) {
+ hlist_del(&im->name_hash);
+ hlist_del(&im->idx_hash);
+ free(im);
+ }
+ return 0;
+ }
+
parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), IFLA_PAYLOAD(n));
- if (tb[IFLA_IFNAME] == NULL)
+ ifname = rta_getattr_str(tb[IFLA_IFNAME]);
+ if (ifname == NULL)
return 0;
- h = ifi->ifi_index & (IDXMAP_SIZE - 1);
- for (imp = &idx_head[h]; (im=*imp)!=NULL; imp = &im->idx_next)
- if (im->index == ifi->ifi_index)
- break;
-
- if (im == NULL) {
- im = malloc(sizeof(*im));
- if (im == NULL)
- return 0;
- im->idx_next = *imp;
- im->index = ifi->ifi_index;
- *imp = im;
+ if (im) {
+ /* change to existing entry */
+ if (strcmp(im->name, ifname) != 0) {
+ hlist_del(&im->name_hash);
+ h = namehash(ifname) & (IDXMAP_SIZE - 1);
+ hlist_add_head(&im->name_hash, &name_head[h]);
+ }
+
+ im->flags = ifi->ifi_flags;
+ return 0;
}
+ im = malloc(sizeof(*im) + strlen(ifname) + 1);
+ if (im == NULL)
+ return 0;
+ im->index = ifi->ifi_index;
+ strcpy(im->name, ifname);
im->type = ifi->ifi_type;
im->flags = ifi->ifi_flags;
- strcpy(im->name, RTA_DATA(tb[IFLA_IFNAME]));
+
+ h = ifi->ifi_index & (IDXMAP_SIZE - 1);
+ hlist_add_head(&im->idx_hash, &idx_head[h]);
+
+ h = namehash(ifname) & (IDXMAP_SIZE - 1);
+ hlist_add_head(&im->name_hash, &name_head[h]);
+
return 0;
}
-const char *ll_idx_n2a(unsigned idx, char *buf)
+const char *ll_idx_n2a(unsigned int idx)
{
- const struct ll_cache *im;
-
- if (idx == 0)
- return "*";
+ static char buf[IFNAMSIZ];
- for (im = idxhead(idx); im; im = im->idx_next)
- if (im->index == idx)
- return im->name;
-
- snprintf(buf, IFNAMSIZ, "if%d", idx);
+ snprintf(buf, sizeof(buf), "if%u", idx);
return buf;
}
+static unsigned int ll_idx_a2n(const char *name)
+{
+ unsigned int idx;
+
+ if (sscanf(name, "if%u", &idx) != 1)
+ return 0;
+ return idx;
+}
-const char *ll_index_to_name(unsigned idx)
+const char *ll_index_to_name(unsigned int idx)
{
- static char nbuf[IFNAMSIZ];
+ static char buf[IFNAMSIZ];
+ const struct ll_cache *im;
+
+ if (idx == 0)
+ return "*";
- return ll_idx_n2a(idx, nbuf);
+ im = ll_get_by_index(idx);
+ if (im)
+ return im->name;
+
+ if (if_indextoname(idx, buf) == NULL)
+ snprintf(buf, IFNAMSIZ, "if%u", idx);
+
+ return buf;
}
int ll_index_to_type(unsigned idx)
if (idx == 0)
return -1;
- for (im = idxhead(idx); im; im = im->idx_next)
- if (im->index == idx)
- return im->type;
- return -1;
+
+ im = ll_get_by_index(idx);
+ return im ? im->type : -1;
}
-unsigned ll_index_to_flags(unsigned idx)
+int ll_index_to_flags(unsigned idx)
{
const struct ll_cache *im;
if (idx == 0)
return 0;
- for (im = idxhead(idx); im; im = im->idx_next)
- if (im->index == idx)
- return im->flags;
- return 0;
+ im = ll_get_by_index(idx);
+ return im ? im->flags : -1;
}
unsigned ll_name_to_index(const char *name)
{
- static char ncache[IFNAMSIZ];
- static int icache;
- struct ll_cache *im;
- int i;
+ const struct ll_cache *im;
unsigned idx;
if (name == NULL)
return 0;
- if (icache && strcmp(name, ncache) == 0)
- return icache;
-
- for (i=0; i<IDXMAP_SIZE; i++) {
- for (im = idx_head[i]; im; im = im->idx_next) {
- if (strcmp(im->name, name) == 0) {
- icache = im->index;
- strcpy(ncache, name);
- return im->index;
- }
- }
- }
+ im = ll_get_by_name(name);
+ if (im)
+ return im->index;
idx = if_nametoindex(name);
if (idx == 0)
- sscanf(name, "if%u", &idx);
+ idx = ll_idx_a2n(name);
return idx;
}
-int ll_init_map(struct rtnl_handle *rth)
+void ll_drop_by_index(unsigned index)
+{
+ struct ll_cache *im;
+
+ im = ll_get_by_index(index);
+ if (!im)
+ return;
+
+ hlist_del(&im->idx_hash);
+ hlist_del(&im->name_hash);
+
+ free(im);
+}
+
+void ll_init_map(struct rtnl_handle *rth)
{
static int initialized;
if (initialized)
- return 0;
+ return;
- if (rtnl_wilddump_request(rth, AF_UNSPEC, RTM_GETLINK) < 0) {
+ if (rtnl_linkdump_req(rth, AF_UNSPEC) < 0) {
perror("Cannot send dump request");
exit(1);
}
}
initialized = 1;
-
- return 0;
}
projects / mirror_iproute2.git / blobdiff