diff options
| author |   Eric Dumazet <edumazet@google.com> | 2022-04-15 17:10:47 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2022-04-17 13:31:31 +0100 |
| commit | 659affdb5140599f25418807c3354b060d4b1b88 (patch) | |
| tree | 438b923abcfa89b76ec6d2b10ebb73a11a67721d /net/ipv4/tcp_input.c | |
| parent | tcp: make tcp_rcv_synsent_state_process() drop monitor friend (diff) | |
| download | linux-dev-659affdb5140599f25418807c3354b060d4b1b88.tar.xz linux-dev-659affdb5140599f25418807c3354b060d4b1b88.zip | |
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.c | 15 |
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: |