6.5-stable review patch. If anyone has any objections, please let me know.
------------------
From: Eric Dumazet <edumazet@xxxxxxxxxx>
[ Upstream commit ac9a7f4ce5dda1472e8f44096f33066c6ec1a3b4 ]
Move udp->encap_enabled to udp->udp_flags.
Add udp_test_and_set_bit() helper to allow lockless
udp_tunnel_encap_enable() implementation.
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Reviewed-by: Willem de Bruijn <willemb@xxxxxxxxxx>
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Stable-dep-of: 70a36f571362 ("udp: annotate data-races around udp->encap_type")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
include/linux/udp.h | 9 ++++-----
include/net/udp_tunnel.h | 9 +++------
net/ipv4/udp.c | 10 +++-------
net/ipv4/udp_tunnel_core.c | 2 +-
net/ipv6/udp.c | 2 +-
5 files changed, 12 insertions(+), 20 deletions(-)
diff --git a/include/linux/udp.h b/include/linux/udp.h
index bb2b87adfbea9..0cf83270a4a28 100644
--- a/include/linux/udp.h
+++ b/include/linux/udp.h
@@ -39,6 +39,7 @@ enum {
UDP_FLAGS_GRO_ENABLED, /* Request GRO aggregation */
UDP_FLAGS_ACCEPT_FRAGLIST,
UDP_FLAGS_ACCEPT_L4,
+ UDP_FLAGS_ENCAP_ENABLED, /* This socket enabled encap */
};
struct udp_sock {
@@ -52,11 +53,7 @@ struct udp_sock {
int pending; /* Any pending frames ? */
__u8 encap_type; /* Is this an Encapsulation socket? */
- unsigned char encap_enabled:1; /* This socket enabled encap
- * processing; UDP tunnels and
- * different encapsulation layer set
- * this
- */
+
/* indicator bits used by pcflag: */
#define UDPLITE_BIT 0x1 /* set by udplite proto init function */
#define UDPLITE_SEND_CC 0x2 /* set via udplite setsockopt */
@@ -104,6 +101,8 @@ struct udp_sock {
test_bit(UDP_FLAGS_##nr, &udp_sk(sk)->udp_flags)
#define udp_set_bit(nr, sk) \
set_bit(UDP_FLAGS_##nr, &udp_sk(sk)->udp_flags)
+#define udp_test_and_set_bit(nr, sk) \
+ test_and_set_bit(UDP_FLAGS_##nr, &udp_sk(sk)->udp_flags)
#define udp_clear_bit(nr, sk) \
clear_bit(UDP_FLAGS_##nr, &udp_sk(sk)->udp_flags)
#define udp_assign_bit(nr, sk, val) \
diff --git a/include/net/udp_tunnel.h b/include/net/udp_tunnel.h
index 0ca9b7a11baf5..29251c3519cf0 100644
--- a/include/net/udp_tunnel.h
+++ b/include/net/udp_tunnel.h
@@ -174,16 +174,13 @@ static inline int udp_tunnel_handle_offloads(struct sk_buff *skb, bool udp_csum)
}
#endif
-static inline void udp_tunnel_encap_enable(struct socket *sock)
+static inline void udp_tunnel_encap_enable(struct sock *sk)
{
- struct udp_sock *up = udp_sk(sock->sk);
-
- if (up->encap_enabled)
+ if (udp_test_and_set_bit(ENCAP_ENABLED, sk))
return;
- up->encap_enabled = 1;
#if IS_ENABLED(CONFIG_IPV6)
- if (sock->sk->sk_family == PF_INET6)
+ if (READ_ONCE(sk->sk_family) == PF_INET6)
ipv6_stub->udpv6_encap_enable();
#endif
udp_encap_enable();
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index a2eb4921d2440..4df99839e7a30 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -2643,7 +2643,7 @@ void udp_destroy_sock(struct sock *sk)
if (encap_destroy)
encap_destroy(sk);
}
- if (up->encap_enabled)
+ if (udp_test_bit(ENCAP_ENABLED, sk))
static_branch_dec(&udp_encap_needed_key);
}
}
@@ -2710,9 +2710,7 @@ int udp_lib_setsockopt(struct sock *sk, int level, int optname,
fallthrough;
case UDP_ENCAP_L2TPINUDP:
up->encap_type = val;
- lock_sock(sk);
- udp_tunnel_encap_enable(sk->sk_socket);
- release_sock(sk);
+ udp_tunnel_encap_enable(sk);
break;
default:
err = -ENOPROTOOPT;
@@ -2735,14 +2733,12 @@ int udp_lib_setsockopt(struct sock *sk, int level, int optname,
break;
case UDP_GRO:
- lock_sock(sk);
/* when enabling GRO, accept the related GSO packet type */
if (valbool)
- udp_tunnel_encap_enable(sk->sk_socket);
+ udp_tunnel_encap_enable(sk);
udp_assign_bit(GRO_ENABLED, sk, valbool);
udp_assign_bit(ACCEPT_L4, sk, valbool);
- release_sock(sk);
break;
/*
diff --git a/net/ipv4/udp_tunnel_core.c b/net/ipv4/udp_tunnel_core.c
index 5f8104cf082d0..732e21b75ba28 100644
--- a/net/ipv4/udp_tunnel_core.c
+++ b/net/ipv4/udp_tunnel_core.c
@@ -78,7 +78,7 @@ void setup_udp_tunnel_sock(struct net *net, struct socket *sock,
udp_sk(sk)->gro_receive = cfg->gro_receive;
udp_sk(sk)->gro_complete = cfg->gro_complete;
- udp_tunnel_encap_enable(sock);
+ udp_tunnel_encap_enable(sk);
}
EXPORT_SYMBOL_GPL(setup_udp_tunnel_sock);
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 3e9497418758f..4f39511bb0969 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -1699,7 +1699,7 @@ void udpv6_destroy_sock(struct sock *sk)
if (encap_destroy)
encap_destroy(sk);
}
- if (up->encap_enabled) {
+ if (udp_test_bit(ENCAP_ENABLED, sk)) {
static_branch_dec(&udpv6_encap_needed_key);
udp_encap_disable();
}
--
2.42.0
