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Diffstat (limited to 'net/ipv4/tcp_ipv4.c')
-rw-r--r--net/ipv4/tcp_ipv4.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index faa6fa619f59..af81e4a6a8d8 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1673,7 +1673,9 @@ bool tcp_add_backlog(struct sock *sk, struct sk_buff *skb)
if (TCP_SKB_CB(tail)->end_seq != TCP_SKB_CB(skb)->seq ||
TCP_SKB_CB(tail)->ip_dsfield != TCP_SKB_CB(skb)->ip_dsfield ||
((TCP_SKB_CB(tail)->tcp_flags |
- TCP_SKB_CB(skb)->tcp_flags) & TCPHDR_URG) ||
+ TCP_SKB_CB(skb)->tcp_flags) & (TCPHDR_SYN | TCPHDR_RST | TCPHDR_URG)) ||
+ !((TCP_SKB_CB(tail)->tcp_flags &
+ TCP_SKB_CB(skb)->tcp_flags) & TCPHDR_ACK) ||
((TCP_SKB_CB(tail)->tcp_flags ^
TCP_SKB_CB(skb)->tcp_flags) & (TCPHDR_ECE | TCPHDR_CWR)) ||
#ifdef CONFIG_TLS_DEVICE
@@ -1692,6 +1694,15 @@ bool tcp_add_backlog(struct sock *sk, struct sk_buff *skb)
if (after(TCP_SKB_CB(skb)->ack_seq, TCP_SKB_CB(tail)->ack_seq))
TCP_SKB_CB(tail)->ack_seq = TCP_SKB_CB(skb)->ack_seq;
+ /* We have to update both TCP_SKB_CB(tail)->tcp_flags and
+ * thtail->fin, so that the fast path in tcp_rcv_established()
+ * is not entered if we append a packet with a FIN.
+ * SYN, RST, URG are not present.
+ * ACK is set on both packets.
+ * PSH : we do not really care in TCP stack,
+ * at least for 'GRO' packets.
+ */
+ thtail->fin |= th->fin;
TCP_SKB_CB(tail)->tcp_flags |= TCP_SKB_CB(skb)->tcp_flags;
if (TCP_SKB_CB(skb)->has_rxtstamp) {