[PATCH net-next] tcp: add indirect call wrapper in tcp_conn_request()

Eric Dumazet
2026-04-10T17:49:53Z

Small improvement in SYN processing, to directly call
tcp_v6_init_seq_and_ts_off() or tcp_v4_init_seq_and_ts_off().

Signed-off-by: Eric Dumazet <edumazet@google.com>
---
include/net/tcp.h | 6 ++++++
net/ipv4/tcp_input.c | 5 ++++-
net/ipv4/tcp_ipv4.c | 2 +-
net/ipv6/tcp_ipv6.c | 2 +-
4 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 6156d1d068e142f696ec9dfff63e3aaebb0171bc..8c3762a9d6fd4e23ed3e1af7fbc8404ad17b1923 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -3085,4 +3085,10 @@ static inline int tcp_recv_should_stop(struct sock *sk)
signal_pending(current);
}

+INDIRECT_CALLABLE_DECLARE(union tcp_seq_and_ts_off
+ tcp_v4_init_seq_and_ts_off(const struct net *net,
+ const struct sk_buff *skb));
+INDIRECT_CALLABLE_DECLARE(union tcp_seq_and_ts_off
+ tcp_v6_init_seq_and_ts_off(const struct net *net,
+ const struct sk_buff *skb));
#endif /* _TCP_H */
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 7171442c3ed7ae62ec45c093cc58ad5a5c978ed9..021f745747c59d8b9e200c5954af7807a4d08866 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -7658,7 +7658,10 @@ int tcp_conn_request(struct request_sock_ops *rsk_ops,
goto drop_and_free;

if (tmp_opt.tstamp_ok || (!want_cookie && !isn))
- st = af_ops->init_seq_and_ts_off(net, skb);
+ st = INDIRECT_CALL_INET(af_ops->init_seq_and_ts_off,
+ tcp_v6_init_seq_and_ts_off,
+ tcp_v4_init_seq_and_ts_off,
+ net, skb);

if (tmp_opt.tstamp_ok) {
tcp_rsk(req)->req_usec_ts = dst_tcp_usec_ts(dst);
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 69ab236072e7142d5ca9d0703d99f02c1e17c738..9309294370a7ba256103813b6e1cb6b79b54cd44 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -105,7 +105,7 @@ static DEFINE_PER_CPU(struct sock_bh_locked, ipv4_tcp_sk) = {

static DEFINE_MUTEX(tcp_exit_batch_mutex);

-static union tcp_seq_and_ts_off
+INDIRECT_CALLABLE_SCOPE union tcp_seq_and_ts_off
tcp_v4_init_seq_and_ts_off(const struct net *net, const struct sk_buff *skb)
{
return secure_tcp_seq_and_ts_off(net,
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 8dc3874e8b9252da60f21ad77a5ca834532e650a..4e39e8dd8e1e04d3771455fee65aecb88436a578 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -105,7 +105,7 @@ static void inet6_sk_rx_dst_set(struct sock *sk, const struct sk_buff *skb)
}
}

-static union tcp_seq_and_ts_off
+INDIRECT_CALLABLE_SCOPE union tcp_seq_and_ts_off
tcp_v6_init_seq_and_ts_off(const struct net *net, const struct sk_buff *skb)
{
return secure_tcpv6_seq_and_ts_off(net,
--
2.53.0.1213.gd9a14994de-goog