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udp: call udp_encap_enable for v6 sockets when enabling encap

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commit a4a600dd301ccde6ea239804ec1f19364a39d643 upstream.

When enabling encap for a ipv6 socket without udp_encap_needed_key
increased, UDP GRO won't work for v4 mapped v6 address packets as
sk will be NULL in udp4_gro_receive().

This patch is to enable it by increasing udp_encap_needed_key for
v6 sockets in udp_tunnel_encap_enable(), and correspondingly
decrease udp_encap_needed_key in udpv6_destroy_sock().

v1->v2:
  - add udp_encap_disable() and export it.
v2->v3:
  - add the change for rxrpc and bareudp into one patch, as Alex
    suggested.
v3->v4:
  - move rxrpc part to another patch.

Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Tested-by: Antonio Quartulli <antonio@openvpn.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Xin Long 2021-02-03 16:54:22 +08:00 committed by Greg Kroah-Hartman
parent 11dc8286f9
commit f3ec0c9db5
4 changed files with 11 additions and 3 deletions
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1
include/net/udp.h
View File

@ -459,6 +459,7 @@ void udp_init(void);
DECLARE_STATIC_KEY_FALSE(udp_encap_needed_key);
void udp_encap_enable(void);
void udp_encap_disable(void);
#if IS_ENABLED(CONFIG_IPV6)
DECLARE_STATIC_KEY_FALSE(udpv6_encap_needed_key);
void udpv6_encap_enable(void);

3
include/net/udp_tunnel.h
View File

@ -178,9 +178,8 @@ static inline void udp_tunnel_encap_enable(struct socket *sock)
#if IS_ENABLED(CONFIG_IPV6)
if (sock->sk->sk_family == PF_INET6)
ipv6_stub->udpv6_encap_enable();
else
#endif
udp_encap_enable();
udp_encap_enable();
}
#endif

6
net/ipv4/udp.c
View File

@ -544,6 +544,12 @@ void udp_encap_enable(void)
}
EXPORT_SYMBOL(udp_encap_enable);
void udp_encap_disable(void)
{
static_branch_dec(&udp_encap_needed_key);
}
EXPORT_SYMBOL(udp_encap_disable);
/* Handler for tunnels with arbitrary destination ports: no socket lookup, go
* through error handlers in encapsulations looking for a match.
*/

4
net/ipv6/udp.c
View File

@ -1553,8 +1553,10 @@ void udpv6_destroy_sock(struct sock *sk)
if (encap_destroy)
encap_destroy(sk);
}
if (up->encap_enabled)
if (up->encap_enabled) {
static_branch_dec(&udpv6_encap_needed_key);
udp_encap_disable();
}
}
inet6_destroy_sock(sk);