[PATCH net-next] Add a tcp_filter hook before handle ack packet
flat view
STALE3409d
From: Chenbo Feng <hidden>
Date: 2017-06-21 02:07:54
Subsystem:
networking [general], networking [tcp], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Neal Cardwell, Linus Torvalds
From: Chenbo Feng <redacted> 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 <redacted> --- net/ipv4/tcp_ipv4.c | 2 ++ net/ipv6/tcp_ipv6.c | 2 ++ 2 files changed, 4 insertions(+)
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 1dc8c44..ca3afb0 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c@@ -1675,6 +1675,8 @@ int tcp_v4_rcv(struct sk_buff *skb) } 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;
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 84ad502..565d89b 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c@@ -1451,6 +1451,8 @@ static int tcp_v6_rcv(struct sk_buff *skb) 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;
--
2.7.4