From: Jason Xing <kerneljasonxing@gmail.com>
To: davem@davemloft.net, edumazet@google.com, kuba@kernel.org,
pabeni@redhat.com, dsahern@kernel.org, kuniyu@amazon.com
Cc: netdev@vger.kernel.org, kerneljasonxing@gmail.com,
Jason Xing <kernelxing@tencent.com>
Subject: [PATCH net-next v4 3/6] tcp: add dropreasons in tcp_rcv_state_process()
Date: Tue, 13 Feb 2024 22:05:05 +0800 [thread overview]
Message-ID: <20240213140508.10878-4-kerneljasonxing@gmail.com> (raw)
In-Reply-To: <20240213140508.10878-1-kerneljasonxing@gmail.com>
From: Jason Xing <kernelxing@tencent.com>
In this patch, I equipped this function with more dropreasons, but
it still doesn't work yet, which I will do later.
Signed-off-by: Jason Xing <kernelxing@tencent.com>
---
include/net/tcp.h | 2 +-
net/ipv4/tcp_input.c | 20 +++++++++++++-------
2 files changed, 14 insertions(+), 8 deletions(-)
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 58e65af74ad1..e5af9a5b411b 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -348,7 +348,7 @@ void tcp_wfree(struct sk_buff *skb);
void tcp_write_timer_handler(struct sock *sk);
void tcp_delack_timer_handler(struct sock *sk);
int tcp_ioctl(struct sock *sk, int cmd, int *karg);
-int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb);
+enum skb_drop_reason tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb);
void tcp_rcv_established(struct sock *sk, struct sk_buff *skb);
void tcp_rcv_space_adjust(struct sock *sk);
int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp);
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 43194918ab45..4bb0ec22538c 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -6619,7 +6619,8 @@ static void tcp_rcv_synrecv_state_fastopen(struct sock *sk)
* address independent.
*/
-int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb)
+enum skb_drop_reason
+tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb)
{
struct tcp_sock *tp = tcp_sk(sk);
struct inet_connection_sock *icsk = inet_csk(sk);
@@ -6635,7 +6636,7 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb)
case TCP_LISTEN:
if (th->ack)
- return 1;
+ return SKB_DROP_REASON_TCP_FLAGS;
if (th->rst) {
SKB_DR_SET(reason, TCP_RESET);
@@ -6704,8 +6705,13 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb)
FLAG_NO_CHALLENGE_ACK);
if ((int)reason <= 0) {
- if (sk->sk_state == TCP_SYN_RECV)
- return 1; /* send one RST */
+ if (sk->sk_state == TCP_SYN_RECV) {
+ /* send one RST */
+ if (!reason)
+ return SKB_DROP_REASON_TCP_OLD_ACK;
+ else
+ return -reason;
+ }
/* accept old ack during closing */
if ((int)reason < 0) {
tcp_send_challenge_ack(sk);
@@ -6781,7 +6787,7 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb)
if (READ_ONCE(tp->linger2) < 0) {
tcp_done(sk);
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPABORTONDATA);
- return 1;
+ return SKB_DROP_REASON_TCP_ABORTONDATA;
}
if (TCP_SKB_CB(skb)->end_seq != TCP_SKB_CB(skb)->seq &&
after(TCP_SKB_CB(skb)->end_seq - th->fin, tp->rcv_nxt)) {
@@ -6790,7 +6796,7 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb)
tcp_fastopen_active_disable(sk);
tcp_done(sk);
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPABORTONDATA);
- return 1;
+ return SKB_DROP_REASON_TCP_ABORTONDATA;
}
tmo = tcp_fin_time(sk);
@@ -6855,7 +6861,7 @@ int tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb)
after(TCP_SKB_CB(skb)->end_seq - th->fin, tp->rcv_nxt)) {
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPABORTONDATA);
tcp_reset(sk, skb);
- return 1;
+ return SKB_DROP_REASON_TCP_ABORTONDATA;
}
}
fallthrough;
--
2.37.3
next prev parent reply other threads:[~2024-02-13 14:06 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-13 14:05 [PATCH net-next v4 0/6] introduce dropreasons in tcp receive path Jason Xing
2024-02-13 14:05 ` [PATCH net-next v4 1/6] tcp: introduce another three dropreasons in " Jason Xing
2024-02-13 15:49 ` David Ahern
2024-02-13 17:00 ` Jason Xing
2024-02-13 14:05 ` [PATCH net-next v4 2/6] tcp: add more specific possible drop reasons in tcp_rcv_synsent_state_process() Jason Xing
2024-02-13 14:05 ` Jason Xing [this message]
2024-02-13 14:05 ` [PATCH net-next v4 4/6] tcp: make the dropreason really work when calling tcp_rcv_state_process() Jason Xing
2024-02-13 14:05 ` [PATCH net-next v4 5/6] tcp: make dropreason in tcp_child_process() work Jason Xing
2024-02-13 14:05 ` [PATCH net-next v4 6/6] tcp: get rid of NOT_SEPCIFIED reason in tcp_v4/6_do_rcv Jason Xing
2024-02-14 2:23 ` [PATCH net-next v4 0/6] introduce dropreasons in tcp receive path Jakub Kicinski
2024-02-14 12:38 ` Jason Xing
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