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    Subject[PATCH RFC/RFT net-next 03/17] net/ipv4: wrappers for arp table references
    Date
    From: David Ahern <dsahern@gmail.com>

    Create a helper, ipv4_neigh_table, for retrieving a reference to the arp
    table. Add additional wrappers for commonly used neigh_* functions to
    avoid propagating the ipv4_neigh_table lookup all over the code.

    Signed-off-by: David Ahern <dsahern@gmail.com>
    ---
    include/net/arp.h | 26 +++++++++++++++++++++++++-
    1 file changed, 25 insertions(+), 1 deletion(-)

    diff --git a/include/net/arp.h b/include/net/arp.h
    index 977aabfcdc03..7b503bedd9fb 100644
    --- a/include/net/arp.h
    +++ b/include/net/arp.h
    @@ -10,6 +10,29 @@

    extern struct neigh_table arp_tbl;

    +static inline struct neigh_table *ipv4_neigh_table(struct net *net)
    +{
    + return neigh_find_table(net, AF_INET);
    +}
    +
    +static inline struct neighbour *ipv4_neigh_create(struct net_device *dev,
    + const void *pkey)
    +{
    + return neigh_create(ipv4_neigh_table(dev_net(dev)), pkey, dev);
    +}
    +
    +static inline struct neighbour *ipv4_neigh_create_noref(struct net_device *dev,
    + const void *pkey)
    +{
    + return __neigh_create(ipv4_neigh_table(dev_net(dev)), pkey, dev, false);
    +}
    +
    +static inline struct neighbour *ipv4_neigh_lookup(struct net_device *dev,
    + void *key)
    +{
    + return neigh_lookup(ipv4_neigh_table(dev_net(dev)), key, dev);
    +}
    +
    static inline u32 arp_hashfn(const void *pkey, const struct net_device *dev, u32 *hash_rnd)
    {
    u32 key = *(const u32 *)pkey;
    @@ -23,7 +46,8 @@ static inline struct neighbour *__ipv4_neigh_lookup_noref(struct net_device *dev
    if (dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))
    key = INADDR_ANY;

    - return ___neigh_lookup_noref(&arp_tbl, neigh_key_eq32, arp_hashfn, &key, dev);
    + return ___neigh_lookup_noref(ipv4_neigh_table(dev_net(dev)),
    + neigh_key_eq32, arp_hashfn, &key, dev);
    }

    static inline struct neighbour *__ipv4_neigh_lookup(struct net_device *dev, u32 key)
    --
    2.11.0
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