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Message-ID: <20230207020820.2704647-1-yyd@google.com>
Date: Tue, 7 Feb 2023 02:08:20 +0000
From: Kevin Yang <yyd@...gle.com>
To: David Miller <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>
Cc: netdev@...r.kernel.org, Kevin Yang <yyd@...gle.com>
Subject: [PATCH net] txhash: fix sk->sk_txrehash default
This code fix a bug that sk->sk_txrehash gets its default enable
value from sysctl_txrehash only when the socket is a TCP listener.
We should have sysctl_txrehash to set the default sk->sk_txrehash,
no matter TCP, nor listerner/connector.
Tested by following packetdrill:
0 socket(..., SOCK_STREAM, IPPROTO_TCP) = 3
+0 socket(..., SOCK_DGRAM, IPPROTO_UDP) = 4
// SO_TXREHASH == 74, default to sysctl_txrehash == 1
+0 getsockopt(3, SOL_SOCKET, 74, [1], [4]) = 0
+0 getsockopt(4, SOL_SOCKET, 74, [1], [4]) = 0
Fixes: 26859240e4ee ("txhash: Add socket option to control TX hash rethink behavior")
Signed-off-by: Kevin Yang <yyd@...gle.com>
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
net/core/sock.c | 3 ++-
net/ipv4/af_inet.c | 1 +
net/ipv4/inet_connection_sock.c | 3 ---
net/ipv6/af_inet6.c | 1 +
4 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/net/core/sock.c b/net/core/sock.c
index f954d5893e79..6f27c24016fe 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1531,6 +1531,8 @@ int sk_setsockopt(struct sock *sk, int level, int optname,
ret = -EINVAL;
break;
}
+ if ((u8)val == SOCK_TXREHASH_DEFAULT)
+ val = READ_ONCE(sock_net(sk)->core.sysctl_txrehash);
/* Paired with READ_ONCE() in tcp_rtx_synack() */
WRITE_ONCE(sk->sk_txrehash, (u8)val);
break;
@@ -3451,7 +3453,6 @@ void sock_init_data(struct socket *sock, struct sock *sk)
sk->sk_pacing_rate = ~0UL;
WRITE_ONCE(sk->sk_pacing_shift, 10);
sk->sk_incoming_cpu = -1;
- sk->sk_txrehash = SOCK_TXREHASH_DEFAULT;
sk_rx_queue_clear(sk);
/*
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 6c0ec2789943..cf11f10927e1 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -347,6 +347,7 @@ static int inet_create(struct net *net, struct socket *sock, int protocol,
sk->sk_destruct = inet_sock_destruct;
sk->sk_protocol = protocol;
sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
+ sk->sk_txrehash = READ_ONCE(net->core.sysctl_txrehash);
inet->uc_ttl = -1;
inet->mc_loop = 1;
diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index d1f837579398..f2c43f67187d 100644
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -1225,9 +1225,6 @@ int inet_csk_listen_start(struct sock *sk)
sk->sk_ack_backlog = 0;
inet_csk_delack_init(sk);
- if (sk->sk_txrehash == SOCK_TXREHASH_DEFAULT)
- sk->sk_txrehash = READ_ONCE(sock_net(sk)->core.sysctl_txrehash);
-
/* There is race window here: we announce ourselves listening,
* but this transition is still not validated by get_port().
* It is OK, because this socket enters to hash table only
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index fee9163382c2..847934763868 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -222,6 +222,7 @@ static int inet6_create(struct net *net, struct socket *sock, int protocol,
np->pmtudisc = IPV6_PMTUDISC_WANT;
np->repflow = net->ipv6.sysctl.flowlabel_reflect & FLOWLABEL_REFLECT_ESTABLISHED;
sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
+ sk->sk_txrehash = READ_ONCE(net->core.sysctl_txrehash);
/* Init the ipv4 part of the socket since we can have sockets
* using v6 API for ipv4.
--
2.39.1.519.gcb327c4b5f-goog
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