inet: Sanitize inet{,6} protocol demux.

Don't pretend that inet_protos[] and inet6_protos[] are hashes, thay
are just a straight arrays.  Remove all unnecessary hash masking.

Document MAX_INET_PROTOS.

Use RAW_HTABLE_SIZE when appropriate.

Reported-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 3 deletions

diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
index 8590144ca330..c4fe1d271131 100644
--- a/net/ipv4/ip_input.c
+++ b/net/ipv4/ip_input.c
@@ -198,14 +198,13 @@ static int ip_local_deliver_finish(struct sk_buff *skb)
         rcu_read_lock();
         {
                 int protocol = ip_hdr(skb)->protocol;
-                int hash, raw;
                 const struct net_protocol *ipprot;
+                int raw;
 
         resubmit:
                 raw = raw_local_deliver(skb, protocol);
 
-                hash = protocol & (MAX_INET_PROTOS - 1);
-                ipprot = rcu_dereference(inet_protos[hash]);
+                ipprot = rcu_dereference(inet_protos[protocol]);
                 if (ipprot != NULL) {
                         int ret;