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, 3 insertions, 5 deletions

diff --git a/net/ipv6/protocol.c b/net/ipv6/protocol.c
index 9a7978fdc02a..053082dfc93e 100644
--- a/net/ipv6/protocol.c
+++ b/net/ipv6/protocol.c
@@ -29,9 +29,7 @@ const struct inet6_protocol __rcu *inet6_protos[MAX_INET_PROTOS] __read_mostly;
 
 int inet6_add_protocol(const struct inet6_protocol *prot, unsigned char protocol)
 {
-        int hash = protocol & (MAX_INET_PROTOS - 1);
-
-        return !cmpxchg((const struct inet6_protocol **)&inet6_protos[hash],
+        return !cmpxchg((const struct inet6_protocol **)&inet6_protos[protocol],
                         NULL, prot) ? 0 : -1;
 }
 EXPORT_SYMBOL(inet6_add_protocol);
@@ -42,9 +40,9 @@ EXPORT_SYMBOL(inet6_add_protocol);
 
 int inet6_del_protocol(const struct inet6_protocol *prot, unsigned char protocol)
 {
-        int ret, hash = protocol & (MAX_INET_PROTOS - 1);
+        int ret;
 
-        ret = (cmpxchg((const struct inet6_protocol **)&inet6_protos[hash],
+        ret = (cmpxchg((const struct inet6_protocol **)&inet6_protos[protocol],
                        prot, NULL) == prot) ? 0 : -1;
 
         synchronize_net();