[INET]: Make inet_create try to load protocol modules

[pandora-kernel.git] / net / ipv4 / af_inet.c

diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 52f5ecc..20f52b5 100644 (file)
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -228,12 +228,14 @@ static int inet_create(struct socket *sock, int protocol)
        struct proto *answer_prot;
        unsigned char answer_flags;
        char answer_no_check;
-       int err;
+       int try_loading_module = 0;
+       int err = -ESOCKTNOSUPPORT;
 
        sock->state = SS_UNCONNECTED;
 
        /* Look for the requested type/protocol pair. */
        answer = NULL;
+lookup_protocol:
        rcu_read_lock();
        list_for_each_rcu(p, &inetsw[sock->type]) {
                answer = list_entry(p, struct inet_protosw, list);
@@ -254,9 +256,28 @@ static int inet_create(struct socket *sock, int protocol)
                answer = NULL;
        }
 
-       err = -ESOCKTNOSUPPORT;
-       if (!answer)
-               goto out_rcu_unlock;
+       if (unlikely(answer == NULL)) {
+               if (try_loading_module < 2) {
+                       rcu_read_unlock();
+                       /*
+                        * Be more specific, e.g. net-pf-2-proto-132-type-1
+                        * (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
+                        */
+                       if (++try_loading_module == 1)
+                               request_module("net-pf-%d-proto-%d-type-%d",
+                                              PF_INET, protocol, sock->type);
+                       /*
+                        * Fall back to generic, e.g. net-pf-2-proto-132
+                        * (net-pf-PF_INET-proto-IPPROTO_SCTP)
+                        */
+                       else
+                               request_module("net-pf-%d-proto-%d",
+                                              PF_INET, protocol);
+                       goto lookup_protocol;
+               } else
+                       goto out_rcu_unlock;
+       }
+
        err = -EPERM;
        if (answer->capability > 0 && !capable(answer->capability))
                goto out_rcu_unlock;