1) A valid RST packet should be consumed, to not confuse drop monitor.
2) Same remark for packet validating cross syn setup,
even if we might ignore part of it.
3) When third packet of 3WHS is delayed, do not pretend
the SYNACK was dropped.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
if (th->rst) {
tcp_reset(sk, skb);
if (th->rst) {
tcp_reset(sk, skb);
+consume:
+ __kfree_skb(skb);
+ return 0;
tcp_enter_quickack_mode(sk, TCP_MAX_QUICKACKS);
inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK,
TCP_DELACK_MAX, TCP_RTO_MAX);
tcp_enter_quickack_mode(sk, TCP_MAX_QUICKACKS);
inet_csk_reset_xmit_timer(sk, ICSK_TIME_DACK,
TCP_DELACK_MAX, TCP_RTO_MAX);
-
-discard:
- tcp_drop(sk, skb);
- return 0;
- } else {
- tcp_send_ack(sk);
#endif
}
/* "fifth, if neither of the SYN or RST bits is set then
#endif
}
/* "fifth, if neither of the SYN or RST bits is set then
discard_and_undo:
tcp_clear_options(&tp->rx_opt);
tp->rx_opt.mss_clamp = saved_clamp;
discard_and_undo:
tcp_clear_options(&tp->rx_opt);
tp->rx_opt.mss_clamp = saved_clamp;
+ tcp_drop(sk, skb);
+ return 0;
reset_and_undo:
tcp_clear_options(&tp->rx_opt);
reset_and_undo:
tcp_clear_options(&tp->rx_opt);