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tcp: add a drop_reason pointer to tcp_check_req()

Browse source 
We want to add new drop reasons for packets dropped in 3WHS in the
following patches.

tcp_rcv_state_process() has to set reason to TCP_FASTOPEN,
because tcp_check_req() will conditionally overwrite the drop_reason.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Jason Xing <kerneljasonxing@gmail.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Link: https://patch.msgid.link/20250301201424.2046477-2-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2025-03-01 20:14:19 +00:00 • committed by Jakub Kicinski
parent 3424291dd2
commit e34100c2ec
5 changed files with 9 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
include/net/tcp.h
View file

@ -392,7 +392,7 @@ enum tcp_tw_status tcp_timewait_state_process(struct inet_timewait_sock *tw,
u32 *tw_isn);
struct sock *tcp_check_req(struct sock *sk, struct sk_buff *skb,
struct request_sock *req, bool fastopen,
bool *lost_race);
bool *lost_race, enum skb_drop_reason *drop_reason);
enum skb_drop_reason tcp_child_process(struct sock *parent, struct sock *child,
struct sk_buff *skb);
void tcp_enter_loss(struct sock *sk);

5
net/ipv4/tcp_input.c
View file

@ -6812,10 +6812,9 @@ tcp_rcv_state_process(struct sock *sk, struct sk_buff *skb)
WARN_ON_ONCE(sk->sk_state != TCP_SYN_RECV &&
sk->sk_state != TCP_FIN_WAIT1);
if (!tcp_check_req(sk, skb, req, true, &req_stolen)) {
SKB_DR_SET(reason, TCP_FASTOPEN);
SKB_DR_SET(reason, TCP_FASTOPEN);
if (!tcp_check_req(sk, skb, req, true, &req_stolen, &reason))
goto discard;
}
}
if (!th->ack && !th->rst && !th->syn) {

3
net/ipv4/tcp_ipv4.c
View file

@ -2265,7 +2265,8 @@ lookup:
th = (const struct tcphdr *)skb->data;
iph = ip_hdr(skb);
tcp_v4_fill_cb(skb, iph, th);
nsk = tcp_check_req(sk, skb, req, false, &req_stolen);
nsk = tcp_check_req(sk, skb, req, false, &req_stolen,
&drop_reason);
} else {
drop_reason = SKB_DROP_REASON_SOCKET_FILTER;
}

3
net/ipv4/tcp_minisocks.c
View file

@ -657,7 +657,8 @@ EXPORT_SYMBOL(tcp_create_openreq_child);
struct sock *tcp_check_req(struct sock *sk, struct sk_buff *skb,
struct request_sock *req,
bool fastopen, bool *req_stolen)
bool fastopen, bool *req_stolen,
enum skb_drop_reason *drop_reason)
{
struct tcp_options_received tmp_opt;
struct sock *child;

3
net/ipv6/tcp_ipv6.c
View file

@ -1828,7 +1828,8 @@ lookup:
th = (const struct tcphdr *)skb->data;
hdr = ipv6_hdr(skb);
tcp_v6_fill_cb(skb, hdr, th);
nsk = tcp_check_req(sk, skb, req, false, &req_stolen);
nsk = tcp_check_req(sk, skb, req, false, &req_stolen,
&drop_reason);
} else {
drop_reason = SKB_DROP_REASON_SOCKET_FILTER;
}