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Revert "selinux: add a skb_owned_by() hook"

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This reverts commit ca10b9e9a8.

No longer needed after commit eb8895debe
("tcp: tcp_make_synack() should use sock_wmalloc")

When under SYNFLOOD, we build lot of SYNACK and hit false sharing
because of multiple modifications done on sk_listener->sk_wmem_alloc

Since tcp_make_synack() uses sock_wmalloc(), there is no need
to call skb_set_owner_w() again, as this adds two atomic operations.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2015-03-20 17:15:19 -07:00 committed by David S. Miller
parent f6877fcf22
commit d3593b5cef
5 changed files with 0 additions and 27 deletions
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8
include/linux/security.h
View File

@ -1716,7 +1716,6 @@ struct security_operations {
int (*tun_dev_attach_queue) (void *security);
int (*tun_dev_attach) (struct sock *sk, void *security);
int (*tun_dev_open) (void *security);
void (*skb_owned_by) (struct sk_buff *skb, struct sock *sk);
#endif /* CONFIG_SECURITY_NETWORK */
#ifdef CONFIG_SECURITY_NETWORK_XFRM
@ -2735,8 +2734,6 @@ int security_tun_dev_attach_queue(void *security);
int security_tun_dev_attach(struct sock *sk, void *security);
int security_tun_dev_open(void *security);
void security_skb_owned_by(struct sk_buff *skb, struct sock *sk);
#else /* CONFIG_SECURITY_NETWORK */
static inline int security_unix_stream_connect(struct sock *sock,
struct sock *other,
@ -2928,11 +2925,6 @@ static inline int security_tun_dev_open(void *security)
{
return 0;
}
static inline void security_skb_owned_by(struct sk_buff *skb, struct sock *sk)
{
}
#endif /* CONFIG_SECURITY_NETWORK */
#ifdef CONFIG_SECURITY_NETWORK_XFRM

1
net/ipv4/tcp_output.c
View File

@ -2926,7 +2926,6 @@ struct sk_buff *tcp_make_synack(struct sock *sk, struct dst_entry *dst,
skb_reserve(skb, MAX_TCP_HEADER);
skb_dst_set(skb, dst);
security_skb_owned_by(skb, sk);
mss = dst_metric_advmss(dst);
if (tp->rx_opt.user_mss && tp->rx_opt.user_mss < mss)

6
security/capability.c
View File

@ -776,11 +776,6 @@ static int cap_tun_dev_open(void *security)
{
return 0;
}
static void cap_skb_owned_by(struct sk_buff *skb, struct sock *sk)
{
}
#endif /* CONFIG_SECURITY_NETWORK */
#ifdef CONFIG_SECURITY_NETWORK_XFRM
@ -1134,7 +1129,6 @@ void __init security_fixup_ops(struct security_operations *ops)
set_to_cap_if_null(ops, tun_dev_open);
set_to_cap_if_null(ops, tun_dev_attach_queue);
set_to_cap_if_null(ops, tun_dev_attach);
set_to_cap_if_null(ops, skb_owned_by);
#endif /* CONFIG_SECURITY_NETWORK */
#ifdef CONFIG_SECURITY_NETWORK_XFRM
set_to_cap_if_null(ops, xfrm_policy_alloc_security);

5
security/security.c
View File

@ -1359,11 +1359,6 @@ int security_tun_dev_open(void *security)
}
EXPORT_SYMBOL(security_tun_dev_open);
void security_skb_owned_by(struct sk_buff *skb, struct sock *sk)
{
security_ops->skb_owned_by(skb, sk);
}
#endif /* CONFIG_SECURITY_NETWORK */
#ifdef CONFIG_SECURITY_NETWORK_XFRM

7
security/selinux/hooks.c
View File

@ -51,7 +51,6 @@
#include <linux/tty.h>
#include <net/icmp.h>
#include <net/ip.h> /* for local_port_range[] */
#include <net/sock.h>
#include <net/tcp.h> /* struct or_callable used in sock_rcv_skb */
#include <net/inet_connection_sock.h>
#include <net/net_namespace.h>
@ -4652,11 +4651,6 @@ static void selinux_inet_conn_established(struct sock *sk, struct sk_buff *skb)
selinux_skb_peerlbl_sid(skb, family, &sksec->peer_sid);
}
static void selinux_skb_owned_by(struct sk_buff *skb, struct sock *sk)
{
skb_set_owner_w(skb, sk);
}
static int selinux_secmark_relabel_packet(u32 sid)
{
const struct task_security_struct *__tsec;
@ -6041,7 +6035,6 @@ static struct security_operations selinux_ops = {
.tun_dev_attach_queue = selinux_tun_dev_attach_queue,
.tun_dev_attach = selinux_tun_dev_attach,
.tun_dev_open = selinux_tun_dev_open,
.skb_owned_by = selinux_skb_owned_by,
#ifdef CONFIG_SECURITY_NETWORK_XFRM
.xfrm_policy_alloc_security = selinux_xfrm_policy_alloc,