Commit 8fac365f authored Jun 20, 2017 by Chenbo Feng Committed by David S. Miller Jun 22, 2017

tcp: Add a tcp_filter hook before handle ack packet

Currently in both ipv4 and ipv6 code path, the ack packet received when
sk at TCP_NEW_SYN_RECV state is not filtered by socket filter or cgroup
filter since it is handled from tcp_child_process and never reaches the
tcp_filter inside tcp_v4_rcv or tcp_v6_rcv. Adding a tcp_filter hooks
here can make sure all the ingress tcp packet can be correctly filtered.

Signed-off-by: Chenbo Feng <fengc@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 2da55390

net/ipv4/tcp_ipv4.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -1729,6 +1729,8 @@ process:
		}
		if (nsk == sk) {
		reqsk_put(req);
		} else if (tcp_filter(sk, skb)) {
		goto discard_and_relse;
		} else if (tcp_child_process(sk, nsk, skb)) {
		tcp_v4_send_reset(nsk, skb);
		goto discard_and_relse;

net/ipv6/tcp_ipv6.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -1464,6 +1464,8 @@ process:
		if (nsk == sk) {
		reqsk_put(req);
		tcp_v6_restore_cb(skb);
		} else if (tcp_filter(sk, skb)) {
		goto discard_and_relse;
		} else if (tcp_child_process(sk, nsk, skb)) {
		tcp_v6_send_reset(nsk, skb);
		goto discard_and_relse;

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