diff options
author | Patrick McHardy <kaber@trash.net> | 2011-12-23 14:00:49 +0100 |
---|---|---|
committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2011-12-23 14:36:45 +0100 |
commit | d70308f78bb8192a76a7dc38f5f9de6c2695532b (patch) | |
tree | 0fbecee36fdc252cf0be5630395e684b6521d302 | |
parent | 329fb58a93b25f0f5ee9d80c0e0e6a6c1a0192b4 (diff) | |
download | op-kernel-dev-d70308f78bb8192a76a7dc38f5f9de6c2695532b.zip op-kernel-dev-d70308f78bb8192a76a7dc38f5f9de6c2695532b.tar.gz |
netfilter: nat: remove module reference counting from NAT protocols
The only remaining user of NAT protocol module reference counting is NAT
ctnetlink support. Since this is a fairly short sequence of code, convert
over to use RCU and remove module reference counting.
Module unregistration is already protected by RCU using synchronize_rcu(),
so no further changes are necessary.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
-rw-r--r-- | include/net/netfilter/nf_nat_protocol.h | 2 | ||||
-rw-r--r-- | net/ipv4/netfilter/nf_nat_core.c | 25 | ||||
-rw-r--r-- | net/ipv4/netfilter/nf_nat_proto_dccp.c | 1 | ||||
-rw-r--r-- | net/ipv4/netfilter/nf_nat_proto_gre.c | 1 | ||||
-rw-r--r-- | net/ipv4/netfilter/nf_nat_proto_icmp.c | 1 | ||||
-rw-r--r-- | net/ipv4/netfilter/nf_nat_proto_sctp.c | 1 | ||||
-rw-r--r-- | net/ipv4/netfilter/nf_nat_proto_tcp.c | 1 | ||||
-rw-r--r-- | net/ipv4/netfilter/nf_nat_proto_udp.c | 1 | ||||
-rw-r--r-- | net/ipv4/netfilter/nf_nat_proto_udplite.c | 1 | ||||
-rw-r--r-- | net/ipv4/netfilter/nf_nat_proto_unknown.c | 1 |
10 files changed, 3 insertions, 32 deletions
diff --git a/include/net/netfilter/nf_nat_protocol.h b/include/net/netfilter/nf_nat_protocol.h index 7156c00..eaad0ac 100644 --- a/include/net/netfilter/nf_nat_protocol.h +++ b/include/net/netfilter/nf_nat_protocol.h @@ -10,8 +10,6 @@ struct nf_nat_protocol { /* Protocol number. */ unsigned int protonum; - struct module *me; - /* Translate a packet to the target according to manip type. Return true if succeeded. */ bool (*manip_pkt)(struct sk_buff *skb, diff --git a/net/ipv4/netfilter/nf_nat_core.c b/net/ipv4/netfilter/nf_nat_core.c index 610eb44..5e1bd85 100644 --- a/net/ipv4/netfilter/nf_nat_core.c +++ b/net/ipv4/netfilter/nf_nat_core.c @@ -575,26 +575,6 @@ static struct nf_ct_ext_type nat_extend __read_mostly = { #include <linux/netfilter/nfnetlink.h> #include <linux/netfilter/nfnetlink_conntrack.h> -static const struct nf_nat_protocol * -nf_nat_proto_find_get(u_int8_t protonum) -{ - const struct nf_nat_protocol *p; - - rcu_read_lock(); - p = __nf_nat_proto_find(protonum); - if (!try_module_get(p->me)) - p = &nf_nat_unknown_protocol; - rcu_read_unlock(); - - return p; -} - -static void -nf_nat_proto_put(const struct nf_nat_protocol *p) -{ - module_put(p->me); -} - static const struct nla_policy protonat_nla_policy[CTA_PROTONAT_MAX+1] = { [CTA_PROTONAT_PORT_MIN] = { .type = NLA_U16 }, [CTA_PROTONAT_PORT_MAX] = { .type = NLA_U16 }, @@ -612,10 +592,11 @@ static int nfnetlink_parse_nat_proto(struct nlattr *attr, if (err < 0) return err; - npt = nf_nat_proto_find_get(nf_ct_protonum(ct)); + rcu_read_lock(); + npt = __nf_nat_proto_find(nf_ct_protonum(ct)); if (npt->nlattr_to_range) err = npt->nlattr_to_range(tb, range); - nf_nat_proto_put(npt); + rcu_read_unlock(); return err; } diff --git a/net/ipv4/netfilter/nf_nat_proto_dccp.c b/net/ipv4/netfilter/nf_nat_proto_dccp.c index c43d5b3..466d63d 100644 --- a/net/ipv4/netfilter/nf_nat_proto_dccp.c +++ b/net/ipv4/netfilter/nf_nat_proto_dccp.c @@ -80,7 +80,6 @@ dccp_manip_pkt(struct sk_buff *skb, static const struct nf_nat_protocol nf_nat_protocol_dccp = { .protonum = IPPROTO_DCCP, - .me = THIS_MODULE, .manip_pkt = dccp_manip_pkt, .in_range = nf_nat_proto_in_range, .unique_tuple = dccp_unique_tuple, diff --git a/net/ipv4/netfilter/nf_nat_proto_gre.c b/net/ipv4/netfilter/nf_nat_proto_gre.c index 9b1c629..35cd158 100644 --- a/net/ipv4/netfilter/nf_nat_proto_gre.c +++ b/net/ipv4/netfilter/nf_nat_proto_gre.c @@ -119,7 +119,6 @@ gre_manip_pkt(struct sk_buff *skb, unsigned int iphdroff, static const struct nf_nat_protocol gre = { .protonum = IPPROTO_GRE, - .me = THIS_MODULE, .manip_pkt = gre_manip_pkt, .in_range = nf_nat_proto_in_range, .unique_tuple = gre_unique_tuple, diff --git a/net/ipv4/netfilter/nf_nat_proto_icmp.c b/net/ipv4/netfilter/nf_nat_proto_icmp.c index 8f87b4b..036c009 100644 --- a/net/ipv4/netfilter/nf_nat_proto_icmp.c +++ b/net/ipv4/netfilter/nf_nat_proto_icmp.c @@ -74,7 +74,6 @@ icmp_manip_pkt(struct sk_buff *skb, const struct nf_nat_protocol nf_nat_protocol_icmp = { .protonum = IPPROTO_ICMP, - .me = THIS_MODULE, .manip_pkt = icmp_manip_pkt, .in_range = icmp_in_range, .unique_tuple = icmp_unique_tuple, diff --git a/net/ipv4/netfilter/nf_nat_proto_sctp.c b/net/ipv4/netfilter/nf_nat_proto_sctp.c index 4e70dc6..50283ab 100644 --- a/net/ipv4/netfilter/nf_nat_proto_sctp.c +++ b/net/ipv4/netfilter/nf_nat_proto_sctp.c @@ -70,7 +70,6 @@ sctp_manip_pkt(struct sk_buff *skb, static const struct nf_nat_protocol nf_nat_protocol_sctp = { .protonum = IPPROTO_SCTP, - .me = THIS_MODULE, .manip_pkt = sctp_manip_pkt, .in_range = nf_nat_proto_in_range, .unique_tuple = sctp_unique_tuple, diff --git a/net/ipv4/netfilter/nf_nat_proto_tcp.c b/net/ipv4/netfilter/nf_nat_proto_tcp.c index 6fcc865..e0e2ba8 100644 --- a/net/ipv4/netfilter/nf_nat_proto_tcp.c +++ b/net/ipv4/netfilter/nf_nat_proto_tcp.c @@ -82,7 +82,6 @@ tcp_manip_pkt(struct sk_buff *skb, const struct nf_nat_protocol nf_nat_protocol_tcp = { .protonum = IPPROTO_TCP, - .me = THIS_MODULE, .manip_pkt = tcp_manip_pkt, .in_range = nf_nat_proto_in_range, .unique_tuple = tcp_unique_tuple, diff --git a/net/ipv4/netfilter/nf_nat_proto_udp.c b/net/ipv4/netfilter/nf_nat_proto_udp.c index 18ea44e..bde94cd 100644 --- a/net/ipv4/netfilter/nf_nat_proto_udp.c +++ b/net/ipv4/netfilter/nf_nat_proto_udp.c @@ -73,7 +73,6 @@ udp_manip_pkt(struct sk_buff *skb, const struct nf_nat_protocol nf_nat_protocol_udp = { .protonum = IPPROTO_UDP, - .me = THIS_MODULE, .manip_pkt = udp_manip_pkt, .in_range = nf_nat_proto_in_range, .unique_tuple = udp_unique_tuple, diff --git a/net/ipv4/netfilter/nf_nat_proto_udplite.c b/net/ipv4/netfilter/nf_nat_proto_udplite.c index a17b75b..58e9a3a 100644 --- a/net/ipv4/netfilter/nf_nat_proto_udplite.c +++ b/net/ipv4/netfilter/nf_nat_proto_udplite.c @@ -72,7 +72,6 @@ udplite_manip_pkt(struct sk_buff *skb, static const struct nf_nat_protocol nf_nat_protocol_udplite = { .protonum = IPPROTO_UDPLITE, - .me = THIS_MODULE, .manip_pkt = udplite_manip_pkt, .in_range = nf_nat_proto_in_range, .unique_tuple = udplite_unique_tuple, diff --git a/net/ipv4/netfilter/nf_nat_proto_unknown.c b/net/ipv4/netfilter/nf_nat_proto_unknown.c index ab8e8c1..e0afe81 100644 --- a/net/ipv4/netfilter/nf_nat_proto_unknown.c +++ b/net/ipv4/netfilter/nf_nat_proto_unknown.c @@ -46,7 +46,6 @@ unknown_manip_pkt(struct sk_buff *skb, } const struct nf_nat_protocol nf_nat_unknown_protocol = { - /* .me isn't set: getting a ref to this cannot fail. */ .manip_pkt = unknown_manip_pkt, .in_range = unknown_in_range, .unique_tuple = unknown_unique_tuple, |