ipv4: introduce __ip_dev_find()

ip_dev_find(net, addr) finds a device given an IPv4 source address and
takes a reference on it.

Introduce __ip_dev_find(), taking a third argument, to optionally take
the device reference. Callers not asking the reference to be taken
should be in an rcu_read_lock() protected section.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/inetdevice.h b/include/linux/inetdevice.h
index 1ec09bb..ccd5b07 100644 (file)
--- a/include/linux/inetdevice.h
+++ b/include/linux/inetdevice.h
@@ -159,7 +159,12 @@ struct in_ifaddr {
 extern int register_inetaddr_notifier(struct notifier_block *nb);
 extern int unregister_inetaddr_notifier(struct notifier_block *nb);
 
-extern struct net_device *ip_dev_find(struct net *net, __be32 addr);
+extern struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref);
+static inline struct net_device *ip_dev_find(struct net *net, __be32 addr)
+{
+       return __ip_dev_find(net, addr, true);
+}
+
 extern int             inet_addr_onlink(struct in_device *in_dev, __be32 a, __be32 b);
 extern int             devinet_ioctl(struct net *net, unsigned int cmd, void __user *);
 extern void            devinet_init(void);

diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
index 981f3c5..4a69a95 100644 (file)
--- a/net/ipv4/fib_frontend.c
+++ b/net/ipv4/fib_frontend.c
@@ -147,34 +147,40 @@ static void fib_flush(struct net *net)
                rt_cache_flush(net, -1);
 }
 
-/*
- *     Find the first device with a given source address.
+/**
+ * __ip_dev_find - find the first device with a given source address.
+ * @net: the net namespace
+ * @addr: the source address
+ * @devref: if true, take a reference on the found device
+ *
+ * If a caller uses devref=false, it should be protected by RCU
  */
-
-struct net_device * ip_dev_find(struct net *net, __be32 addr)
+struct net_device *__ip_dev_find(struct net *net, __be32 addr, bool devref)
 {
-       struct flowi fl = { .nl_u = { .ip4_u = { .daddr = addr } },
-                           .flags = FLOWI_FLAG_MATCH_ANY_IIF };
-       struct fib_result res;
+       struct flowi fl = {
+               .nl_u = {
+                       .ip4_u = {
+                               .daddr = addr
+                       }
+               },
+               .flags = FLOWI_FLAG_MATCH_ANY_IIF
+       };
+       struct fib_result res = { 0 };
        struct net_device *dev = NULL;
 
-#ifdef CONFIG_IP_MULTIPLE_TABLES
-       res.r = NULL;
-#endif
-
        if (fib_lookup(net, &fl, &res))
                return NULL;
        if (res.type != RTN_LOCAL)
                goto out;
        dev = FIB_RES_DEV(res);
 
-       if (dev)
+       if (dev && devref)
                dev_hold(dev);
 out:
        fib_res_put(&res);
        return dev;
 }
-EXPORT_SYMBOL(ip_dev_find);
+EXPORT_SYMBOL(__ip_dev_find);
 
 /*
  * Find address type as if only "dev" was present in the system. If