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tcp: add drop reasons to tcp_rcv_synsent_state_process()

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Re-use existing reasons.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2022-04-15 17:10:47 -07:00
committed by David S. Miller
parent c337578a65
commit 659affdb51
1 changed files with 9 additions and 6 deletions
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net/ipv4/tcp_input.c
+9 -6
View File
@@ -6144,6 +6144,7 @@ static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb,
struct tcp_fastopen_cookie foc = { .len = -1 };
int saved_clamp = tp->rx_opt.mss_clamp;
bool fastopen_fail;
SKB_DR(reason);
tcp_parse_options(sock_net(sk), skb, &tp->rx_opt, 0, &foc);
if (tp->rx_opt.saw_tstamp && tp->rx_opt.rcv_tsecr)
@@ -6198,9 +6199,10 @@ consume:
* See note below!
* --ANK(990513)
*/
if (!th->syn)
if (!th->syn) {
SKB_DR_SET(reason, TCP_FLAGS);
goto discard_and_undo;
}
/* rfc793:
* "If the SYN bit is on ...
* are acceptable then ...
@@ -6291,15 +6293,16 @@ consume:
*
* Otherwise (no ACK) drop the segment and return."
*/
SKB_DR_SET(reason, TCP_RESET);
goto discard_and_undo;
}
/* PAWS check. */
if (tp->rx_opt.ts_recent_stamp && tp->rx_opt.saw_tstamp &&
tcp_paws_reject(&tp->rx_opt, 0))
tcp_paws_reject(&tp->rx_opt, 0)) {
SKB_DR_SET(reason, TCP_RFC7323_PAWS);
goto discard_and_undo;
}
if (th->syn) {
/* We see SYN without ACK. It is attempt of
* simultaneous connect with crossed SYNs.
@@ -6358,7 +6361,7 @@ consume:
discard_and_undo:
tcp_clear_options(&tp->rx_opt);
tp->rx_opt.mss_clamp = saved_clamp;
tcp_drop(sk, skb);
tcp_drop_reason(sk, skb, reason);
return 0;
reset_and_undo: