diff options
Diffstat (limited to 'net/ipv4/ip_output.c')
| -rw-r--r-- | net/ipv4/ip_output.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c index 844323b6cfb9..15da5527bd61 100644 --- a/net/ipv4/ip_output.c +++ b/net/ipv4/ip_output.c @@ -79,6 +79,7 @@ #include <linux/mroute.h> #include <linux/netlink.h> #include <linux/tcp.h> +#include <linux/locallock.h> int sysctl_ip_default_ttl __read_mostly = IPDEFTTL; EXPORT_SYMBOL(sysctl_ip_default_ttl); @@ -1476,6 +1477,9 @@ static DEFINE_PER_CPU(struct inet_sock, unicast_sock) = { .uc_ttl = -1, }; +/* serialize concurrent calls on the same CPU to ip_send_unicast_reply */ +static DEFINE_LOCAL_IRQ_LOCK(unicast_lock); + void ip_send_unicast_reply(struct net *net, struct sk_buff *skb, __be32 daddr, __be32 saddr, const struct ip_reply_arg *arg, unsigned int len) @@ -1516,7 +1520,7 @@ void ip_send_unicast_reply(struct net *net, struct sk_buff *skb, __be32 daddr, if (IS_ERR(rt)) return; - inet = &get_cpu_var(unicast_sock); + inet = &get_locked_var(unicast_lock, unicast_sock); inet->tos = arg->tos; sk = &inet->sk; @@ -1544,8 +1548,9 @@ void ip_send_unicast_reply(struct net *net, struct sk_buff *skb, __be32 daddr, skb_set_queue_mapping(nskb, skb_get_queue_mapping(skb)); ip_push_pending_frames(sk, &fl4); } + out: - put_cpu_var(unicast_sock); + put_locked_var(unicast_lock, unicast_sock); ip_rt_put(rt); } |