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Diffstat (limited to 'net/ipv4/tunnel4.c')
-rw-r--r--net/ipv4/tunnel4.c19
1 files changed, 12 insertions, 7 deletions
diff --git a/net/ipv4/tunnel4.c b/net/ipv4/tunnel4.c
index 59186ca7808..9a17bd2a0a3 100644
--- a/net/ipv4/tunnel4.c
+++ b/net/ipv4/tunnel4.c
@@ -14,8 +14,8 @@
#include <net/protocol.h>
#include <net/xfrm.h>
-static struct xfrm_tunnel *tunnel4_handlers;
-static struct xfrm_tunnel *tunnel64_handlers;
+static struct xfrm_tunnel *tunnel4_handlers __read_mostly;
+static struct xfrm_tunnel *tunnel64_handlers __read_mostly;
static DEFINE_MUTEX(tunnel4_mutex);
static inline struct xfrm_tunnel **fam_handlers(unsigned short family)
@@ -39,7 +39,7 @@ int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family)
}
handler->next = *pprev;
- *pprev = handler;
+ rcu_assign_pointer(*pprev, handler);
ret = 0;
@@ -73,6 +73,11 @@ int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family)
}
EXPORT_SYMBOL(xfrm4_tunnel_deregister);
+#define for_each_tunnel_rcu(head, handler) \
+ for (handler = rcu_dereference(head); \
+ handler != NULL; \
+ handler = rcu_dereference(handler->next)) \
+
static int tunnel4_rcv(struct sk_buff *skb)
{
struct xfrm_tunnel *handler;
@@ -80,7 +85,7 @@ static int tunnel4_rcv(struct sk_buff *skb)
if (!pskb_may_pull(skb, sizeof(struct iphdr)))
goto drop;
- for (handler = tunnel4_handlers; handler; handler = handler->next)
+ for_each_tunnel_rcu(tunnel4_handlers, handler)
if (!handler->handler(skb))
return 0;
@@ -99,7 +104,7 @@ static int tunnel64_rcv(struct sk_buff *skb)
if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
goto drop;
- for (handler = tunnel64_handlers; handler; handler = handler->next)
+ for_each_tunnel_rcu(tunnel64_handlers, handler)
if (!handler->handler(skb))
return 0;
@@ -115,7 +120,7 @@ static void tunnel4_err(struct sk_buff *skb, u32 info)
{
struct xfrm_tunnel *handler;
- for (handler = tunnel4_handlers; handler; handler = handler->next)
+ for_each_tunnel_rcu(tunnel4_handlers, handler)
if (!handler->err_handler(skb, info))
break;
}
@@ -125,7 +130,7 @@ static void tunnel64_err(struct sk_buff *skb, u32 info)
{
struct xfrm_tunnel *handler;
- for (handler = tunnel64_handlers; handler; handler = handler->next)
+ for_each_tunnel_rcu(tunnel64_handlers, handler)
if (!handler->err_handler(skb, info))
break;
}