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authorEric Dumazet <edumazet@google.com>2022-04-16 03:10:47 +0300
committerDavid S. Miller <davem@davemloft.net>2022-04-17 15:31:31 +0300
commit659affdb5140599f25418807c3354b060d4b1b88 (patch)
tree438b923abcfa89b76ec6d2b10ebb73a11a67721d /net/ipv4/tcp_input.c
parentc337578a6592d671c5e78accc55f00cc594fe2da (diff)
downloadlinux-659affdb5140599f25418807c3354b060d4b1b88.tar.xz
tcp: add drop reasons to tcp_rcv_synsent_state_process()
Re-use existing reasons. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp_input.c')
-rw-r--r--net/ipv4/tcp_input.c15
1 files changed, 9 insertions, 6 deletions
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index cd9f5c39f85a..339cc3d40745 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -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: