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monitor: Use socket filter for PAE / EAPoL to catch all packets

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This commit is contained in:
Marcel Holtmann 2014-08-12 21:44:30 -07:00
parent 07aabaf455
commit 40160a7fd4
1 changed files with 19 additions and 1 deletions
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20
monitor/nlmon.c
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@ -38,6 +38,7 @@
#include <linux/netlink.h>
#include <linux/genetlink.h>
#include <linux/rtnetlink.h>
#include <linux/filter.h>
#include <ell/ell.h>
#include "linux/nl80211.h"
@ -2044,18 +2045,35 @@ static bool pae_receive(struct l_io *io, void *user_data)
return true;
}
static struct sock_filter filter[] = {
/* skb->protocol == 0x888e (PAE) */
{ 0x28, 0, 0, 0xfffff000 }, /* (000) ldh #proto */
{ 0x15, 0, 1, 0x0000888e }, /* (001) jeq #0x888e jt 2 jf 3 */
{ 0x06, 0, 0, 0xffffffff }, /* (002) ret #-1 */
{ 0x06, 0, 0, 0x00000000 }, /* (003) ret #0 */
};
static const struct sock_fprog fprog = { .len = 4, .filter = filter };
static struct l_io *open_pae(void)
{
struct l_io *io;
int fd, opt = 1;
fd = socket(PF_PACKET, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK,
htons(ETH_P_PAE));
htons(ETH_P_ALL));
if (fd < 0) {
perror("Failed to create authentication socket");
return NULL;
}
if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER,
&fprog, sizeof(fprog)) < 0) {
perror("Failed to enable authentication filter");
close(fd);
return NULL;
}
if (setsockopt(fd, SOL_SOCKET, SO_TIMESTAMP, &opt, sizeof(opt)) < 0) {
perror("Failed to enable authentication timestamps");
close(fd);