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tpacket_rcv() can be hit under DDOS quite hard, since it will always grab a socket spinlock, to eventually find there is no room for an additional packet. Using tcpdump [1] on a busy host can lead to catastrophic consequences, because of all cpus spinning on a contended spinlock. This replicates a similar strategy used in packet_rcv() [1] Also some applications mistakenly use af_packet socket bound to ETH_P_ALL only to send packets. Receive queue is never drained and immediately full. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
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| .. | ||
| af_packet.c | ||
| diag.c | ||
| internal.h | ||
| Kconfig | ||
| Makefile | ||