| From | Sasha Levin <> | Subject | [PATCH AUTOSEL for 4.4 065/162] tcp: Add a tcp_filter hook before handle ack packet | Date | Mon, 9 Apr 2018 00:28:29 +0000 |
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From: Chenbo Feng <fengc@google.com>
[ Upstream commit 8fac365f63c866a00015fa13932d8ffc584518b8 ]
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> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> --- 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 61c93a93f228..2eb9a1747f25 100644 --- a/net/ipv4/tcp_ipv4.c +++ b/net/ipv4/tcp_ipv4.c @@ -1639,6 +1639,8 @@ 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; diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index 74cbcc4b399c..7d7f0999a919 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -1428,6 +1428,8 @@ 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; -- 2.15.1
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