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Diffstat (limited to 'libc/inet/if_index.c')
-rw-r--r--libc/inet/if_index.c133
1 files changed, 131 insertions, 2 deletions
diff --git a/libc/inet/if_index.c b/libc/inet/if_index.c
index dfddbc0d4..40e46d538 100644
--- a/libc/inet/if_index.c
+++ b/libc/inet/if_index.c
@@ -36,6 +36,8 @@
#include <sys/ioctl.h>
#include <libc-internal.h>
+#include "netlinkaccess.h"
+
extern int __opensock(void) attribute_hidden;
unsigned int
@@ -78,7 +80,9 @@ if_freenameindex (struct if_nameindex *ifn)
}
free (ifn);
}
+hidden_strong_alias(if_freenameindex,__if_freenameindex)
+#if !__ASSUME_NETLINK_SUPPORT
struct if_nameindex *
if_nameindex (void)
{
@@ -157,6 +161,131 @@ if_nameindex (void)
return idx;
#endif
}
+#else
+struct if_nameindex *
+if_nameindex (void)
+{
+ unsigned int nifs = 0;
+ struct netlink_handle nh = { 0, 0, 0, NULL, NULL };
+ struct if_nameindex *idx = NULL;
+ struct netlink_res *nlp;
+
+ if (__netlink_open (&nh) < 0)
+ return NULL;
+
+
+ /* Tell the kernel that we wish to get a list of all
+ active interfaces. Collect all data for every interface. */
+ if (__netlink_request (&nh, RTM_GETLINK) < 0)
+ goto exit_free;
+
+ /* Count the interfaces. */
+ for (nlp = nh.nlm_list; nlp; nlp = nlp->next)
+ {
+ struct nlmsghdr *nlh;
+ size_t size = nlp->size;
+
+ if (nlp->nlh == NULL)
+ continue;
+
+ /* Walk through all entries we got from the kernel and look, which
+ message type they contain. */
+ for (nlh = nlp->nlh; NLMSG_OK (nlh, size); nlh = NLMSG_NEXT (nlh, size))
+ {
+ /* Check if the message is what we want. */
+ if ((pid_t) nlh->nlmsg_pid != nh.pid || nlh->nlmsg_seq != nlp->seq)
+ continue;
+
+ if (nlh->nlmsg_type == NLMSG_DONE)
+ break; /* ok */
+
+ if (nlh->nlmsg_type == RTM_NEWLINK)
+ ++nifs;
+ }
+ }
+
+ idx = malloc ((nifs + 1) * sizeof (struct if_nameindex));
+ if (idx == NULL)
+ {
+ nomem:
+ __set_errno (ENOBUFS);
+ goto exit_free;
+ }
+
+ /* Add the interfaces. */
+ nifs = 0;
+ for (nlp = nh.nlm_list; nlp; nlp = nlp->next)
+ {
+ struct nlmsghdr *nlh;
+ size_t size = nlp->size;
+
+ if (nlp->nlh == NULL)
+ continue;
+
+ /* Walk through all entries we got from the kernel and look, which
+ message type they contain. */
+ for (nlh = nlp->nlh; NLMSG_OK (nlh, size); nlh = NLMSG_NEXT (nlh, size))
+ {
+ /* Check if the message is what we want. */
+ if ((pid_t) nlh->nlmsg_pid != nh.pid || nlh->nlmsg_seq != nlp->seq)
+ continue;
+
+ if (nlh->nlmsg_type == NLMSG_DONE)
+ break; /* ok */
+
+ if (nlh->nlmsg_type == RTM_NEWLINK)
+ {
+ struct ifinfomsg *ifim = (struct ifinfomsg *) NLMSG_DATA (nlh);
+ struct rtattr *rta = IFLA_RTA (ifim);
+ size_t rtasize = IFLA_PAYLOAD (nlh);
+
+ idx[nifs].if_index = ifim->ifi_index;
+
+ while (RTA_OK (rta, rtasize))
+ {
+ char *rta_data = RTA_DATA (rta);
+ size_t rta_payload = RTA_PAYLOAD (rta);
+
+ if (rta->rta_type == IFLA_IFNAME)
+ {
+ idx[nifs].if_name = __strndup (rta_data, rta_payload);
+ if (idx[nifs].if_name == NULL)
+ {
+ idx[nifs].if_index = 0;
+ __if_freenameindex (idx);
+ idx = NULL;
+ goto nomem;
+ }
+ break;
+ }
+
+ rta = RTA_NEXT (rta, rtasize);
+ }
+
+ ++nifs;
+ }
+ }
+ }
+
+ idx[nifs].if_index = 0;
+ idx[nifs].if_name = NULL;
+
+ exit_free:
+ __netlink_free_handle (&nh);
+ __netlink_close (&nh);
+
+ return idx;
+}
+#endif
+hidden_strong_alias(if_nameindex,__if_nameindex)
+
+#if 0
+struct if_nameindex *
+if_nameindex (void)
+{
+ return (if_nameindex_netlink () != NULL ? : if_nameindex_ioctl ());
+}
+#endif
char *
if_indextoname (unsigned int ifindex, char *ifname)
@@ -194,7 +323,7 @@ if_indextoname (unsigned int ifindex, char *ifname)
struct if_nameindex *p;
char *result = NULL;
- idx = if_nameindex();
+ idx = __if_nameindex();
if (idx != NULL)
{
@@ -205,7 +334,7 @@ if_indextoname (unsigned int ifindex, char *ifname)
break;
}
- if_freenameindex (idx);
+ __if_freenameindex (idx);
if (result == NULL)
__set_errno (ENXIO);