net: inetdevice: provide replacement iterators for in_ifaddr walk

The ifa_list is protected either by rcu or rtnl lock, but the
current iterators do not account for this.

This adds two iterators as replacement, a later patch in
the series will update them with the needed rcu/rtnl_dereference calls.

Its not done in this patch yet to avoid sparse warnings -- the fields
lack the proper __rcu annotation.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 9 insertions, 1 deletions

diff --git a/include/linux/inetdevice.h b/include/linux/inetdevice.h
index 367dc2a0f84a..d5d05503a04b 100644
--- a/include/linux/inetdevice.h
+++ b/include/linux/inetdevice.h
@@ -186,7 +186,7 @@ __be32 inet_confirm_addr(struct net *net, struct in_device *in_dev, __be32 dst,
 struct in_ifaddr *inet_ifa_byprefix(struct in_device *in_dev, __be32 prefix,
                                     __be32 mask);
 struct in_ifaddr *inet_lookup_ifaddr_rcu(struct net *net, __be32 addr);
-static __inline__ bool inet_ifa_match(__be32 addr, struct in_ifaddr *ifa)
+static inline bool inet_ifa_match(__be32 addr, const struct in_ifaddr *ifa)
 {
         return !((addr^ifa->ifa_address)&ifa->ifa_mask);
 }
@@ -215,6 +215,14 @@ static __inline__ bool bad_mask(__be32 mask, __be32 addr)
 
 #define endfor_ifa(in_dev) }
 
+#define in_dev_for_each_ifa_rtnl(ifa, in_dev)                   \
+        for (ifa = (in_dev)->ifa_list; ifa;                     \
+             ifa = ifa->ifa_next)
+
+#define in_dev_for_each_ifa_rcu(ifa, in_dev)                    \
+        for (ifa = (in_dev)->ifa_list; ifa;                     \
+             ifa = ifa->ifa_next)
+
 static inline struct in_device *__in_dev_get_rcu(const struct net_device *dev)
 {
         return rcu_dereference(dev->ip_ptr);