net/packet: implement shortcut in tpacket_rcv()
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>
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 2d49967..860ca3e 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -2193,6 +2193,12 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
if (!res)
goto drop_n_restore;
+ /* If we are flooded, just give up */
+ if (__packet_rcv_has_room(po, skb) == ROOM_NONE) {
+ atomic_inc(&po->tp_drops);
+ goto drop_n_restore;
+ }
+
if (skb->ip_summed == CHECKSUM_PARTIAL)
status |= TP_STATUS_CSUMNOTREADY;
else if (skb->pkt_type != PACKET_OUTGOING &&