From: YOSHIFUJI Hideaki Date: Sat, 3 Dec 2005 04:56:57 +0000 (-0800) Subject: [IPV6]: Load protocol module dynamically. X-Git-Tag: firefly_0821_release~39719^2 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=af1afe866297448ad8a1da99fa8a6af86c43c909;p=firefly-linux-kernel-4.4.55.git [IPV6]: Load protocol module dynamically. [ Modified to match inet_create() bug fix by Herbert Xu -DaveM ] Signed-off-by: YOSHIFUJI Hideaki Signed-off-by: David S. Miller --- diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c index c63b8ce0e1b5..d9546380fa04 100644 --- a/net/ipv6/af_inet6.c +++ b/net/ipv6/af_inet6.c @@ -92,10 +92,13 @@ static int inet6_create(struct socket *sock, int protocol) struct proto *answer_prot; unsigned char answer_flags; char answer_no_check; - int rc; + int try_loading_module = 0; + int err; /* Look for the requested type/protocol pair. */ answer = NULL; +lookup_protocol: + err = -ESOCKTNOSUPPORT; rcu_read_lock(); list_for_each_rcu(p, &inetsw6[sock->type]) { answer = list_entry(p, struct inet_protosw, list); @@ -113,21 +116,37 @@ static int inet6_create(struct socket *sock, int protocol) if (IPPROTO_IP == answer->protocol) break; } + err = -EPROTONOSUPPORT; answer = NULL; } - rc = -ESOCKTNOSUPPORT; - if (!answer) - goto out_rcu_unlock; - rc = -EPERM; + if (!answer) { + if (try_loading_module < 2) { + rcu_read_unlock(); + /* + * Be more specific, e.g. net-pf-10-proto-132-type-1 + * (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM) + */ + if (++try_loading_module == 1) + request_module("net-pf-%d-proto-%d-type-%d", + PF_INET6, protocol, sock->type); + /* + * Fall back to generic, e.g. net-pf-10-proto-132 + * (net-pf-PF_INET6-proto-IPPROTO_SCTP) + */ + else + request_module("net-pf-%d-proto-%d", + PF_INET6, protocol); + goto lookup_protocol; + } else + goto out_rcu_unlock; + } + + err = -EPERM; if (answer->capability > 0 && !capable(answer->capability)) goto out_rcu_unlock; - rc = -EPROTONOSUPPORT; - if (!protocol) - goto out_rcu_unlock; sock->ops = answer->ops; - answer_prot = answer->prot; answer_no_check = answer->no_check; answer_flags = answer->flags; @@ -135,14 +154,14 @@ static int inet6_create(struct socket *sock, int protocol) BUG_TRAP(answer_prot->slab != NULL); - rc = -ENOBUFS; + err = -ENOBUFS; sk = sk_alloc(PF_INET6, GFP_KERNEL, answer_prot, 1); if (sk == NULL) goto out; sock_init_data(sock, sk); - rc = 0; + err = 0; sk->sk_no_check = answer_no_check; if (INET_PROTOSW_REUSE & answer_flags) sk->sk_reuse = 1; @@ -202,14 +221,14 @@ static int inet6_create(struct socket *sock, int protocol) sk->sk_prot->hash(sk); } if (sk->sk_prot->init) { - rc = sk->sk_prot->init(sk); - if (rc) { + err = sk->sk_prot->init(sk); + if (err) { sk_common_release(sk); goto out; } } out: - return rc; + return err; out_rcu_unlock: rcu_read_unlock(); goto out;