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