From: Hans Wippel <hwippel@linux.vnet.ibm.com>
Date: Fri, 23 Mar 2018 11:05:45 +0100
Subject: net/ipv4: disable SMC TCP option with SYN Cookies
Patch-mainline: v4.16
Git-commit: bc58a1baf2a97838a422ce4e75180c4b680e7a9b
References: bsc#1096003, FATE#325023, LTC#164003
Currently, the SMC experimental TCP option in a SYN packet is lost on
the server side when SYN Cookies are active. However, the corresponding
SYNACK sent back to the client contains the SMC option. This causes an
inconsistent view of the SMC capabilities on the client and server.
This patch disables the SMC option in the SYNACK when SYN Cookies are
active to avoid this issue.
Fixes: 60e2a7780793b ("tcp: TCP experimental option for SMC")
Signed-off-by: Hans Wippel <hwippel@linux.vnet.ibm.com>
Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Johannes Thumshirn <jthumshirn@suse.de>
---
net/ipv4/syncookies.c | 2 ++
net/ipv4/tcp_input.c | 3 +++
net/ipv6/syncookies.c | 2 ++
3 files changed, 7 insertions(+)
diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c
index fda37f2862c9..c3387dfd725b 100644
--- a/net/ipv4/syncookies.c
+++ b/net/ipv4/syncookies.c
@@ -349,6 +349,8 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb)
req->ts_recent = tcp_opt.saw_tstamp ? tcp_opt.rcv_tsval : 0;
treq->snt_synack = 0;
treq->tfo_listener = false;
+ if (IS_ENABLED(CONFIG_SMC))
+ ireq->smc_ok = 0;
ireq->ir_iif = inet_request_bound_dev_if(sk, skb);
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 9a1b3c1c1c14..ff6cd98ce8d5 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -6256,6 +6256,9 @@ int tcp_conn_request(struct request_sock_ops *rsk_ops,
if (want_cookie && !tmp_opt.saw_tstamp)
tcp_clear_options(&tmp_opt);
+ if (IS_ENABLED(CONFIG_SMC) && want_cookie)
+ tmp_opt.smc_ok = 0;
+
tmp_opt.tstamp_ok = tmp_opt.saw_tstamp;
tcp_openreq_init(req, &tmp_opt, skb, sk);
inet_rsk(req)->no_srccheck = inet_sk(sk)->transparent;
diff --git a/net/ipv6/syncookies.c b/net/ipv6/syncookies.c
index e7a3a6b6cf56..e997141aed8c 100644
--- a/net/ipv6/syncookies.c
+++ b/net/ipv6/syncookies.c
@@ -217,6 +217,8 @@ struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb)
treq->snt_isn = cookie;
treq->ts_off = 0;
treq->txhash = net_tx_rndhash();
+ if (IS_ENABLED(CONFIG_SMC))
+ ireq->smc_ok = 0;
/*
* We need to lookup the dst_entry to get the correct window size.