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Message-Id: <20241018232017.46833-12-chia-yu.chang@nokia-bell-labs.com>
Date: Sat, 19 Oct 2024 01:20:14 +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, 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 v3 net-next 11/14] tcp: allow ECN bits in TOS/traffic class
From: Ilpo Järvinen <ij@...nel.org>
AccECN connection's last ACK cannot retain ECT(1) as the bits
are always cleared causing the packet to switch into another
service queue.
This effectively adds a finer-grained filtering for ECN bits
so that acceptable TW ACKs can retain the bits.
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 | 3 ++-
net/ipv4/ip_output.c | 3 +--
net/ipv4/tcp_ipv4.c | 23 +++++++++++++++++------
net/ipv4/tcp_minisocks.c | 2 +-
net/ipv6/tcp_ipv6.c | 23 ++++++++++++++++-------
5 files changed, 37 insertions(+), 17 deletions(-)
diff --git a/include/net/tcp.h b/include/net/tcp.h
index ae3f900f17c1..fe8ecaa4f71c 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -417,7 +417,8 @@ enum tcp_tw_status {
TCP_TW_SUCCESS = 0,
TCP_TW_RST = 1,
TCP_TW_ACK = 2,
- TCP_TW_SYN = 3
+ TCP_TW_SYN = 3,
+ TCP_TW_ACK_OOW = 4
};
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 0065b1996c94..2fe7b1df3b90 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -75,7 +75,6 @@
#include <net/checksum.h>
#include <net/gso.h>
#include <net/inetpeer.h>
-#include <net/inet_ecn.h>
#include <net/lwtunnel.h>
#include <net/inet_dscp.h>
#include <linux/bpf-cgroup.h>
@@ -1643,7 +1642,7 @@ void ip_send_unicast_reply(struct sock *sk, const struct sock *orig_sk,
if (IS_ERR(rt))
return;
- inet_sk(sk)->tos = arg->tos & ~INET_ECN_MASK;
+ inet_sk(sk)->tos = arg->tos;
sk->sk_protocol = ip_hdr(skb)->protocol;
sk->sk_bound_dev_if = arg->bound_dev_if;
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index d5aa248125f5..9419e7b492fc 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -66,6 +66,7 @@
#include <net/transp_v6.h>
#include <net/ipv6.h>
#include <net/inet_common.h>
+#include <net/inet_ecn.h>
#include <net/timewait_sock.h>
#include <net/xfrm.h>
#include <net/secure_seq.h>
@@ -887,7 +888,7 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb,
BUILD_BUG_ON(offsetof(struct sock, sk_bound_dev_if) !=
offsetof(struct inet_timewait_sock, tw_bound_dev_if));
- arg.tos = ip_hdr(skb)->tos;
+ arg.tos = ip_hdr(skb)->tos & ~INET_ECN_MASK;
arg.uid = sock_net_uid(net, sk && sk_fullsock(sk) ? sk : NULL);
local_bh_disable();
local_lock_nested_bh(&ipv4_tcp_sk.bh_lock);
@@ -1033,11 +1034,17 @@ static void tcp_v4_send_ack(const struct sock *sk,
local_bh_enable();
}
-static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb)
+static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb,
+ enum tcp_tw_status tw_status)
{
struct inet_timewait_sock *tw = inet_twsk(sk);
struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
struct tcp_key key = {};
+ u8 tos = tw->tw_tos;
+
+ if (tw_status == TCP_TW_ACK_OOW)
+ tos &= ~INET_ECN_MASK;
+
#ifdef CONFIG_TCP_AO
struct tcp_ao_info *ao_info;
@@ -1080,7 +1087,7 @@ static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb)
READ_ONCE(tcptw->tw_ts_recent),
tw->tw_bound_dev_if, &key,
tw->tw_transparent ? IP_REPLY_ARG_NOSRCCHECK : 0,
- tw->tw_tos,
+ tos,
tw->tw_txhash);
inet_twsk_put(tw);
@@ -1157,7 +1164,7 @@ static void tcp_v4_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
READ_ONCE(req->ts_recent),
0, &key,
inet_rsk(req)->no_srccheck ? IP_REPLY_ARG_NOSRCCHECK : 0,
- ip_hdr(skb)->tos,
+ ip_hdr(skb)->tos & ~INET_ECN_MASK,
READ_ONCE(tcp_rsk(req)->txhash));
if (tcp_key_is_ao(&key))
kfree(key.traffic_key);
@@ -2177,6 +2184,7 @@ static void tcp_v4_fill_cb(struct sk_buff *skb, const struct iphdr *iph,
int tcp_v4_rcv(struct sk_buff *skb)
{
struct net *net = dev_net(skb->dev);
+ enum tcp_tw_status tw_status;
enum skb_drop_reason drop_reason;
int sdif = inet_sdif(skb);
int dif = inet_iif(skb);
@@ -2404,7 +2412,9 @@ int tcp_v4_rcv(struct sk_buff *skb)
inet_twsk_put(inet_twsk(sk));
goto csum_error;
}
- switch (tcp_timewait_state_process(inet_twsk(sk), skb, th, &isn)) {
+
+ tw_status = tcp_timewait_state_process(inet_twsk(sk), skb, th, &isn);
+ switch (tw_status) {
case TCP_TW_SYN: {
struct sock *sk2 = inet_lookup_listener(net,
net->ipv4.tcp_death_row.hashinfo,
@@ -2425,7 +2435,8 @@ int tcp_v4_rcv(struct sk_buff *skb)
/* to ACK */
fallthrough;
case TCP_TW_ACK:
- tcp_v4_timewait_ack(sk, skb);
+ case TCP_TW_ACK_OOW:
+ tcp_v4_timewait_ack(sk, skb, tw_status);
break;
case TCP_TW_RST:
tcp_v4_send_reset(sk, skb, SK_RST_REASON_TCP_TIMEWAIT_SOCKET);
diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index bd6515ab660f..8fb9f550fdeb 100644
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -44,7 +44,7 @@ tcp_timewait_check_oow_rate_limit(struct inet_timewait_sock *tw,
/* Send ACK. Note, we do not put the bucket,
* it will be released by caller.
*/
- return TCP_TW_ACK;
+ return TCP_TW_ACK_OOW;
}
/* We are rate-limiting, so just release the tw sock and drop skb. */
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 252d3dac3a09..d9551c9cd562 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -997,7 +997,7 @@ static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32
if (!IS_ERR(dst)) {
skb_dst_set(buff, dst);
ip6_xmit(ctl_sk, buff, &fl6, fl6.flowi6_mark, NULL,
- tclass & ~INET_ECN_MASK, priority);
+ tclass, priority);
TCP_INC_STATS(net, TCP_MIB_OUTSEGS);
if (rst)
TCP_INC_STATS(net, TCP_MIB_OUTRSTS);
@@ -1133,7 +1133,8 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb,
trace_tcp_send_reset(sk, skb, reason);
tcp_v6_send_response(sk, skb, seq, ack_seq, 0, 0, 0, oif, 1,
- ipv6_get_dsfield(ipv6h), label, priority, txhash,
+ ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK,
+ label, priority, txhash,
&key);
#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO)
@@ -1153,11 +1154,16 @@ static void tcp_v6_send_ack(const struct sock *sk, struct sk_buff *skb, u32 seq,
tclass, label, priority, txhash, key);
}
-static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
+static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb,
+ enum tcp_tw_status tw_status)
{
struct inet_timewait_sock *tw = inet_twsk(sk);
struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
struct tcp_key key = {};
+ u8 tclass = tw->tw_tclass;
+
+ if (tw_status == TCP_TW_ACK_OOW)
+ tclass &= ~INET_ECN_MASK;
#ifdef CONFIG_TCP_AO
struct tcp_ao_info *ao_info;
@@ -1201,7 +1207,7 @@ static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
tcp_tw_tsval(tcptw),
READ_ONCE(tcptw->tw_ts_recent), tw->tw_bound_dev_if,
- &key, tw->tw_tclass, cpu_to_be32(tw->tw_flowlabel),
+ &key, tclass, cpu_to_be32(tw->tw_flowlabel),
tw->tw_priority, tw->tw_txhash);
#ifdef CONFIG_TCP_AO
@@ -1278,7 +1284,7 @@ static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
tcp_synack_window(req) >> inet_rsk(req)->rcv_wscale,
tcp_rsk_tsval(tcp_rsk(req)),
READ_ONCE(req->ts_recent), sk->sk_bound_dev_if,
- &key, ipv6_get_dsfield(ipv6_hdr(skb)), 0,
+ &key, ipv6_get_dsfield(ipv6_hdr(skb)) & ~INET_ECN_MASK, 0,
READ_ONCE(sk->sk_priority),
READ_ONCE(tcp_rsk(req)->txhash));
if (tcp_key_is_ao(&key))
@@ -1747,6 +1753,7 @@ static void tcp_v6_fill_cb(struct sk_buff *skb, const struct ipv6hdr *hdr,
INDIRECT_CALLABLE_SCOPE int tcp_v6_rcv(struct sk_buff *skb)
{
+ enum tcp_tw_status tw_status;
enum skb_drop_reason drop_reason;
int sdif = inet6_sdif(skb);
int dif = inet6_iif(skb);
@@ -1968,7 +1975,8 @@ INDIRECT_CALLABLE_SCOPE int tcp_v6_rcv(struct sk_buff *skb)
goto csum_error;
}
- switch (tcp_timewait_state_process(inet_twsk(sk), skb, th, &isn)) {
+ tw_status = tcp_timewait_state_process(inet_twsk(sk), skb, th, &isn);
+ switch (tw_status) {
case TCP_TW_SYN:
{
struct sock *sk2;
@@ -1993,7 +2001,8 @@ INDIRECT_CALLABLE_SCOPE int tcp_v6_rcv(struct sk_buff *skb)
/* to ACK */
fallthrough;
case TCP_TW_ACK:
- tcp_v6_timewait_ack(sk, skb);
+ case TCP_TW_ACK_OOW:
+ tcp_v6_timewait_ack(sk, skb, tw_status);
break;
case TCP_TW_RST:
tcp_v6_send_reset(sk, skb, SK_RST_REASON_TCP_TIMEWAIT_SOCKET);
--
2.34.1
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