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monitor: Match on skb->dev->type and skb->protocol for both filters

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This commit is contained in:
Marcel Holtmann 2014-08-13 22:22:28 -07:00
parent 0d81689e08
commit d57006ae23
1 changed files with 24 additions and 12 deletions
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36
monitor/nlmon.c
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@ -1859,15 +1859,22 @@ static bool nlmon_receive(struct l_io *io, void *user_data)
return true;
}
/*
* BPF filter to match skb->dev->type == 824 (ARPHRD_NETLINK) and
* either match skb->protocol == 0x0000 (NETLINK_ROUTE) or match
* skb->protocol == 0x0010 (NETLINK_GENERIC).
*/
static struct sock_filter mon_filter[] = {
/* skb->dev->type == 824 (ARPHRD_NETLINK) */
{ 0x28, 0, 0, 0xfffff01c }, /* (000) ldh #hatype */
{ 0x15, 0, 1, 0x00000338 }, /* (001) jeq #824 jt 2 jf 3 */
{ 0x06, 0, 0, 0xffffffff }, /* (002) ret #-1 */
{ 0x06, 0, 0, 0x00000000 }, /* (003) ret #0 */
{ 0x28, 0, 0, 0xfffff01c }, /* ldh #hatype */
{ 0x15, 0, 3, 0x00000338 }, /* jne #824, drop */
{ 0x28, 0, 0, 0xfffff000 }, /* ldh #proto */
{ 0x15, 2, 0, 0000000000 }, /* jeq #0x0000, pass */
{ 0x15, 1, 0, 0x00000010 }, /* jeq #0x0010, pass */
{ 0x06, 0, 0, 0000000000 }, /* drop: ret #0 */
{ 0x06, 0, 0, 0xffffffff }, /* pass: ret #-1 */
};
static const struct sock_fprog mon_fprog = { .len = 4, .filter = mon_filter };
static const struct sock_fprog mon_fprog = { .len = 7, .filter = mon_filter };
static struct l_io *open_packet(const char *name)
{
@ -2062,15 +2069,20 @@ static bool pae_receive(struct l_io *io, void *user_data)
return true;
}
/*
* BPF filter to match skb->dev->type == 1 (ARPHRD_ETHER) and
* match skb->protocol == 0x888e (PAE).
*/
static struct sock_filter pae_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 */
{ 0x28, 0, 0, 0xfffff01c }, /* ldh #hatype */
{ 0x15, 0, 3, 0x00000001 }, /* jne #1, drop */
{ 0x28, 0, 0, 0xfffff000 }, /* ldh #proto */
{ 0x15, 0, 1, 0x0000888e }, /* jne #0x888e, drop */
{ 0x06, 0, 0, 0xffffffff }, /* ret #-1 */
{ 0x06, 0, 0, 0000000000 }, /* drop: ret #0 */
};
static const struct sock_fprog pae_fprog = { .len = 4, .filter = pae_filter };
static const struct sock_fprog pae_fprog = { .len = 6, .filter = pae_filter };
static struct l_io *open_pae(void)
{