tcp: refine SYN handling in tcp_validate_incoming

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Followup of commit 0c24604b68 (tcp: implement RFC 5961 4.2)

As reported by Vijay Subramanian, we should send a challenge ACK
instead of a dup ack if a SYN flag is set on a packet received out of
window.

This permits the ratelimiting to work as intended, and to increase
correct SNMP counters.

Suggested-by: Vijay Subramanian <subramanian.vijay@gmail.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Vijay Subramanian <subramanian.vijay@gmail.com>
Cc: Kiran Kumar Kella <kkiran@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Eric Dumazet 2012-07-17 12:29:30 +00:00 • committed by David S. Miller

parent b6fe83e952

commit e371589917

1 changed files with 5 additions and 1 deletions

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net/ipv4/tcp_input.c

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