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Message-Id: <20241021215910.59767-8-chia-yu.chang@nokia-bell-labs.com>
Date: Mon, 21 Oct 2024 23:59:03 +0200
From: chia-yu.chang@...ia-bell-labs.com
To: netdev@...r.kernel.org, davem@...emloft.net, edumazet@...gle.com,
kuba@...nel.org, pabeni@...hat.com, dsahern@...nel.org,
netfilter-devel@...r.kernel.org, kadlec@...filter.org,
coreteam@...filter.org, pablo@...filter.org, bpf@...r.kernel.org,
joel.granados@...nel.org, linux-fsdevel@...r.kernel.org,
kees@...nel.org, mcgrof@...nel.org, ij@...nel.org,
ncardwell@...gle.com, koen.de_schepper@...ia-bell-labs.com,
g.white@...leLabs.com, ingemar.s.johansson@...csson.com,
mirja.kuehlewind@...csson.com, cheshire@...le.com, rs.ietf@....at,
Jason_Livingood@...cast.com, vidhi_goel@...le.com
Cc: Chia-Yu Chang <chia-yu.chang@...ia-bell-labs.com>
Subject: [PATCH v4 net-next 07/14] tcp: helpers for ECN mode handling
From: Ilpo Järvinen <ij@...nel.org>
Create helpers for TCP ECN modes. No functional changes.
Signed-off-by: Ilpo Järvinen <ij@...nel.org>
Signed-off-by: Chia-Yu Chang <chia-yu.chang@...ia-bell-labs.com>
---
include/net/tcp.h | 44 ++++++++++++++++++++++++++++++++++++----
net/ipv4/tcp.c | 2 +-
net/ipv4/tcp_dctcp.c | 2 +-
net/ipv4/tcp_input.c | 14 ++++++-------
net/ipv4/tcp_minisocks.c | 4 +++-
net/ipv4/tcp_output.c | 6 +++---
6 files changed, 55 insertions(+), 17 deletions(-)
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 55a7f0a7ee59..b6a4e0124280 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -372,10 +372,46 @@ static inline void tcp_dec_quickack_mode(struct sock *sk)
}
}
-#define TCP_ECN_OK 1
-#define TCP_ECN_QUEUE_CWR 2
-#define TCP_ECN_DEMAND_CWR 4
-#define TCP_ECN_SEEN 8
+#define TCP_ECN_MODE_RFC3168 BIT(0)
+#define TCP_ECN_QUEUE_CWR BIT(1)
+#define TCP_ECN_DEMAND_CWR BIT(2)
+#define TCP_ECN_SEEN BIT(3)
+#define TCP_ECN_MODE_ACCECN BIT(4)
+
+#define TCP_ECN_DISABLED 0
+#define TCP_ECN_MODE_PENDING (TCP_ECN_MODE_RFC3168 | TCP_ECN_MODE_ACCECN)
+#define TCP_ECN_MODE_ANY (TCP_ECN_MODE_RFC3168 | TCP_ECN_MODE_ACCECN)
+
+static inline bool tcp_ecn_mode_any(const struct tcp_sock *tp)
+{
+ return tp->ecn_flags & TCP_ECN_MODE_ANY;
+}
+
+static inline bool tcp_ecn_mode_rfc3168(const struct tcp_sock *tp)
+{
+ return (tp->ecn_flags & TCP_ECN_MODE_ANY) == TCP_ECN_MODE_RFC3168;
+}
+
+static inline bool tcp_ecn_mode_accecn(const struct tcp_sock *tp)
+{
+ return (tp->ecn_flags & TCP_ECN_MODE_ANY) == TCP_ECN_MODE_ACCECN;
+}
+
+static inline bool tcp_ecn_disabled(const struct tcp_sock *tp)
+{
+ return !tcp_ecn_mode_any(tp);
+}
+
+static inline bool tcp_ecn_mode_pending(const struct tcp_sock *tp)
+{
+ return (tp->ecn_flags & TCP_ECN_MODE_PENDING) == TCP_ECN_MODE_PENDING;
+}
+
+static inline void tcp_ecn_mode_set(struct tcp_sock *tp, u8 mode)
+{
+ tp->ecn_flags &= ~TCP_ECN_MODE_ANY;
+ tp->ecn_flags |= mode;
+}
enum tcp_tw_status {
TCP_TW_SUCCESS = 0,
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 82cc4a5633ce..94546f55385a 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -4107,7 +4107,7 @@ void tcp_get_info(struct sock *sk, struct tcp_info *info)
info->tcpi_rcv_wscale = tp->rx_opt.rcv_wscale;
}
- if (tp->ecn_flags & TCP_ECN_OK)
+ if (tcp_ecn_mode_any(tp))
info->tcpi_options |= TCPI_OPT_ECN;
if (tp->ecn_flags & TCP_ECN_SEEN)
info->tcpi_options |= TCPI_OPT_ECN_SEEN;
diff --git a/net/ipv4/tcp_dctcp.c b/net/ipv4/tcp_dctcp.c
index 8a45a4aea933..03abe0848420 100644
--- a/net/ipv4/tcp_dctcp.c
+++ b/net/ipv4/tcp_dctcp.c
@@ -90,7 +90,7 @@ __bpf_kfunc static void dctcp_init(struct sock *sk)
{
const struct tcp_sock *tp = tcp_sk(sk);
- if ((tp->ecn_flags & TCP_ECN_OK) ||
+ if (tcp_ecn_mode_any(tp) ||
(sk->sk_state == TCP_LISTEN ||
sk->sk_state == TCP_CLOSE)) {
struct dctcp *ca = inet_csk_ca(sk);
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 6d4abd452a36..0161660938d3 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -334,7 +334,7 @@ static bool tcp_in_quickack_mode(struct sock *sk)
static void tcp_ecn_queue_cwr(struct tcp_sock *tp)
{
- if (tp->ecn_flags & TCP_ECN_OK)
+ if (tcp_ecn_mode_rfc3168(tp))
tp->ecn_flags |= TCP_ECN_QUEUE_CWR;
}
@@ -361,7 +361,7 @@ static void tcp_data_ecn_check(struct sock *sk, const struct sk_buff *skb)
{
struct tcp_sock *tp = tcp_sk(sk);
- if (!(tcp_sk(sk)->ecn_flags & TCP_ECN_OK))
+ if (tcp_ecn_disabled(tp))
return;
switch (TCP_SKB_CB(skb)->ip_dsfield & INET_ECN_MASK) {
@@ -394,19 +394,19 @@ static void tcp_data_ecn_check(struct sock *sk, const struct sk_buff *skb)
static void tcp_ecn_rcv_synack(struct tcp_sock *tp, const struct tcphdr *th)
{
- if ((tp->ecn_flags & TCP_ECN_OK) && (!th->ece || th->cwr))
- tp->ecn_flags &= ~TCP_ECN_OK;
+ if (tcp_ecn_mode_rfc3168(tp) && (!th->ece || th->cwr))
+ tcp_ecn_mode_set(tp, TCP_ECN_DISABLED);
}
static void tcp_ecn_rcv_syn(struct tcp_sock *tp, const struct tcphdr *th)
{
- if ((tp->ecn_flags & TCP_ECN_OK) && (!th->ece || !th->cwr))
- tp->ecn_flags &= ~TCP_ECN_OK;
+ if (tcp_ecn_mode_rfc3168(tp) && (!th->ece || !th->cwr))
+ tcp_ecn_mode_set(tp, TCP_ECN_DISABLED);
}
static bool tcp_ecn_rcv_ecn_echo(const struct tcp_sock *tp, const struct tcphdr *th)
{
- if (th->ece && !th->syn && (tp->ecn_flags & TCP_ECN_OK))
+ if (th->ece && !th->syn && tcp_ecn_mode_rfc3168(tp))
return true;
return false;
}
diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index bb1fe1ba867a..bd6515ab660f 100644
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -453,7 +453,9 @@ EXPORT_SYMBOL(tcp_openreq_init_rwin);
static void tcp_ecn_openreq_child(struct tcp_sock *tp,
const struct request_sock *req)
{
- tp->ecn_flags = inet_rsk(req)->ecn_ok ? TCP_ECN_OK : 0;
+ tcp_ecn_mode_set(tp, inet_rsk(req)->ecn_ok ?
+ TCP_ECN_MODE_RFC3168 :
+ TCP_ECN_DISABLED);
}
void tcp_ca_openreq_child(struct sock *sk, const struct dst_entry *dst)
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 64d47c18255f..bb83ad43a4e2 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -322,7 +322,7 @@ static void tcp_ecn_send_synack(struct sock *sk, struct sk_buff *skb)
const struct tcp_sock *tp = tcp_sk(sk);
TCP_SKB_CB(skb)->tcp_flags &= ~TCPHDR_CWR;
- if (!(tp->ecn_flags & TCP_ECN_OK))
+ if (tcp_ecn_disabled(tp))
TCP_SKB_CB(skb)->tcp_flags &= ~TCPHDR_ECE;
else if (tcp_ca_needs_ecn(sk) ||
tcp_bpf_ca_needs_ecn(sk))
@@ -351,7 +351,7 @@ static void tcp_ecn_send_syn(struct sock *sk, struct sk_buff *skb)
INET_ECN_xmit(sk);
TCP_SKB_CB(skb)->tcp_flags |= TCPHDR_ECE | TCPHDR_CWR;
- tp->ecn_flags = TCP_ECN_OK;
+ tcp_ecn_mode_set(tp, TCP_ECN_MODE_RFC3168);
}
}
@@ -379,7 +379,7 @@ static void tcp_ecn_send(struct sock *sk, struct sk_buff *skb,
{
struct tcp_sock *tp = tcp_sk(sk);
- if (tp->ecn_flags & TCP_ECN_OK) {
+ if (tcp_ecn_mode_rfc3168(tp)) {
/* Not-retransmitted data segment: set ECT and inject CWR. */
if (skb->len != tcp_header_len &&
!before(TCP_SKB_CB(skb)->seq, tp->snd_nxt)) {
--
2.34.1
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