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pcapif_low_level_input: let IPv6-multicast MAC addresses through, correctly check IPv4-multicast MAC addresses

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Simon Goldschmidt 2011-11-23 21:29:43 +01:00
parent 3a5de6effd
commit 62a162ac66
1 changed files with 13 additions and 6 deletions
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17
ports/win32/pcapif.c
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@ -639,14 +639,21 @@ pcapif_low_level_input(struct netif *netif, const void *packet, int packet_len)
struct eth_addr *src = dest + 1; struct eth_addr *src = dest + 1;
int unicast; int unicast;
const u8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}; const u8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
const u8_t mcast[] = {0x01, 0x00, 0x5e}; const u8_t ipv4mcast[] = {0x01, 0x00, 0x5e};
const u8_t ipv6mcast[] = {0x33, 0x33};
/* Don't let feedback packets through (limitation in winpcap?) */
if(!memcmp(src, netif->hwaddr, ETHARP_HWADDR_LEN)) {
/* don't update counters here! */
return NULL;
}
/* MAC filter: only let my MAC or non-unicast through (pcap receives loopback traffic, too) */ /* MAC filter: only let my MAC or non-unicast through (pcap receives loopback traffic, too) */
unicast = ((dest->addr[0] & 0x01) == 0); unicast = ((dest->addr[0] & 0x01) == 0);
if ((memcmp(dest, &netif->hwaddr, ETHARP_HWADDR_LEN) && if (memcmp(dest, &netif->hwaddr, ETHARP_HWADDR_LEN) &&
memcmp(dest, mcast, 3) && memcmp(dest, bcast, 6)) || (memcmp(dest, ipv4mcast, 3) || ((dest->addr[3] & 0x80) != 0)) &&
/* and don't let feedback packets through (limitation in winpcap?) */ memcmp(dest, ipv6mcast, 2) &&
(!memcmp(src, netif->hwaddr, ETHARP_HWADDR_LEN))) { memcmp(dest, bcast, 6)) {
/* don't update counters here! */ /* don't update counters here! */
return NULL; return NULL;
} }