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net: add __rcu annotation to sk_filter

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Add __rcu annotation to :
        (struct sock)->sk_filter

And use appropriate rcu primitives to reduce sparse warnings if
CONFIG_SPARSE_RCU_POINTER=y

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2010-10-25 03:47:05 +00:00 committed by David S. Miller
parent 1c87733d06
commit 0d7da9ddd9
6 changed files with 7 additions and 7 deletions
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2
include/net/sock.h
View File

@ -301,7 +301,7 @@ struct sock {
const struct cred *sk_peer_cred;
long sk_rcvtimeo;
long sk_sndtimeo;
struct sk_filter *sk_filter;
struct sk_filter __rcu *sk_filter;
void *sk_protinfo;
struct timer_list sk_timer;
ktime_t sk_stamp;

4
net/core/filter.c
View File

@ -89,8 +89,8 @@ int sk_filter(struct sock *sk, struct sk_buff *skb)
rcu_read_lock_bh();
filter = rcu_dereference_bh(sk->sk_filter);
if (filter) {
unsigned int pkt_len = sk_run_filter(skb, filter->insns,
filter->len);
unsigned int pkt_len = sk_run_filter(skb, filter->insns, filter->len);
err = pkt_len ? pskb_trim(skb, pkt_len) : -EPERM;
}
rcu_read_unlock_bh();

2
net/core/sock.c
View File

@ -1225,7 +1225,7 @@ struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
sock_reset_flag(newsk, SOCK_DONE);
skb_queue_head_init(&newsk->sk_error_queue);
filter = newsk->sk_filter;
filter = rcu_dereference_protected(newsk->sk_filter, 1);
if (filter != NULL)
sk_filter_charge(newsk, filter);

2
net/ipv4/udp.c
View File

@ -1413,7 +1413,7 @@ int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
}
}
if (sk->sk_filter) {
if (rcu_dereference_raw(sk->sk_filter)) {
if (udp_lib_checksum_complete(skb))
goto drop;
}

2
net/ipv6/raw.c
View File

@ -373,7 +373,7 @@ void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
static inline int rawv6_rcv_skb(struct sock * sk, struct sk_buff * skb)
{
if ((raw6_sk(sk)->checksum || sk->sk_filter) &&
if ((raw6_sk(sk)->checksum || rcu_dereference_raw(sk->sk_filter)) &&
skb_checksum_complete(skb)) {
atomic_inc(&sk->sk_drops);
kfree_skb(skb);

2
net/ipv6/udp.c
View File

@ -527,7 +527,7 @@ int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
}
}
if (sk->sk_filter) {
if (rcu_dereference_raw(sk->sk_filter)) {
if (udp_lib_checksum_complete(skb))
goto drop;
}