IPv6: fix race between cleanup and add/delete address

[linux-2.6.git] / net / netfilter / nf_conntrack_proto.c

diff --git a/net/netfilter/nf_conntrack_proto.c b/net/netfilter/nf_conntrack_proto.c
index 8595b5946acf03bb78c58ab9dfbbe617067df404..1a4568bf7ea515ee790b700dfe85a31c38b8bdc6 100644 (file)
--- a/net/netfilter/nf_conntrack_proto.c
+++ b/net/netfilter/nf_conntrack_proto.c
@@ -22,6 +22,7 @@
 #include <linux/notifier.h>
 #include <linux/kernel.h>
 #include <linux/netdevice.h>
+#include <linux/rtnetlink.h>
 
 #include <net/netfilter/nf_conntrack.h>
 #include <net/netfilter/nf_conntrack_l3proto.h>
@@ -73,27 +74,6 @@ EXPORT_SYMBOL_GPL(__nf_ct_l4proto_find);
 
 /* this is guaranteed to always return a valid protocol helper, since
  * it falls back to generic_protocol */
-struct nf_conntrack_l4proto *
-nf_ct_l4proto_find_get(u_int16_t l3proto, u_int8_t l4proto)
-{
-       struct nf_conntrack_l4proto *p;
-
-       rcu_read_lock();
-       p = __nf_ct_l4proto_find(l3proto, l4proto);
-       if (!try_module_get(p->me))
-               p = &nf_conntrack_l4proto_generic;
-       rcu_read_unlock();
-
-       return p;
-}
-EXPORT_SYMBOL_GPL(nf_ct_l4proto_find_get);
-
-void nf_ct_l4proto_put(struct nf_conntrack_l4proto *p)
-{
-       module_put(p->me);
-}
-EXPORT_SYMBOL_GPL(nf_ct_l4proto_put);
-
 struct nf_conntrack_l3proto *
 nf_ct_l3proto_find_get(u_int16_t l3proto)
 {
@@ -146,18 +126,15 @@ EXPORT_SYMBOL_GPL(nf_ct_l3proto_module_put);
 
 static int kill_l3proto(struct nf_conn *i, void *data)
 {
-       return (i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num ==
-                       ((struct nf_conntrack_l3proto *)data)->l3proto);
+       return nf_ct_l3num(i) == ((struct nf_conntrack_l3proto *)data)->l3proto;
 }
 
 static int kill_l4proto(struct nf_conn *i, void *data)
 {
        struct nf_conntrack_l4proto *l4proto;
        l4proto = (struct nf_conntrack_l4proto *)data;
-       return (i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum ==
-                       l4proto->l4proto) &&
-              (i->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num ==
-                       l4proto->l3proto);
+       return nf_ct_protonum(i) == l4proto->l4proto &&
+              nf_ct_l3num(i) == l4proto->l3proto;
 }
 
 static int nf_ct_l3proto_register_sysctl(struct nf_conntrack_l3proto *l3proto)
@@ -190,6 +167,9 @@ int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto)
        if (proto->l3proto >= AF_MAX)
                return -EBUSY;
 
+       if (proto->tuple_to_nlattr && !proto->nlattr_tuple_size)
+               return -EINVAL;
+
        mutex_lock(&nf_ct_proto_mutex);
        if (nf_ct_l3protos[proto->l3proto] != &nf_conntrack_l3proto_generic) {
                ret = -EBUSY;
@@ -200,6 +180,9 @@ int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto)
        if (ret < 0)
                goto out_unlock;
 
+       if (proto->nlattr_tuple_size)
+               proto->nla_size = 3 * proto->nlattr_tuple_size();
+
        rcu_assign_pointer(nf_ct_l3protos[proto->l3proto], proto);
 
 out_unlock:
@@ -210,6 +193,8 @@ EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_register);
 
 void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto)
 {
+       struct net *net;
+
        BUG_ON(proto->l3proto >= AF_MAX);
 
        mutex_lock(&nf_ct_proto_mutex);
@@ -222,7 +207,10 @@ void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto)
        synchronize_rcu();
 
        /* Remove all contrack entries for this protocol */
-       nf_ct_iterate_cleanup(kill_l3proto, proto);
+       rtnl_lock();
+       for_each_net(net)
+               nf_ct_iterate_cleanup(net, kill_l3proto, proto);
+       rtnl_unlock();
 }
 EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_unregister);
 
@@ -281,6 +269,10 @@ int nf_conntrack_l4proto_register(struct nf_conntrack_l4proto *l4proto)
        if (l4proto->l3proto >= PF_MAX)
                return -EBUSY;
 
+       if ((l4proto->to_nlattr && !l4proto->nlattr_size)
+               || (l4proto->tuple_to_nlattr && !l4proto->nlattr_tuple_size))
+               return -EINVAL;
+
        mutex_lock(&nf_ct_proto_mutex);
        if (!nf_ct_protos[l4proto->l3proto]) {
                /* l3proto may be loaded latter. */
@@ -308,6 +300,12 @@ int nf_conntrack_l4proto_register(struct nf_conntrack_l4proto *l4proto)
        if (ret < 0)
                goto out_unlock;
 
+       l4proto->nla_size = 0;
+       if (l4proto->nlattr_size)
+               l4proto->nla_size += l4proto->nlattr_size();
+       if (l4proto->nlattr_tuple_size)
+               l4proto->nla_size += 3 * l4proto->nlattr_tuple_size();
+
        rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto],
                           l4proto);
 
@@ -319,6 +317,8 @@ EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_register);
 
 void nf_conntrack_l4proto_unregister(struct nf_conntrack_l4proto *l4proto)
 {
+       struct net *net;
+
        BUG_ON(l4proto->l3proto >= PF_MAX);
 
        mutex_lock(&nf_ct_proto_mutex);
@@ -331,7 +331,10 @@ void nf_conntrack_l4proto_unregister(struct nf_conntrack_l4proto *l4proto)
        synchronize_rcu();
 
        /* Remove all contrack entries for this protocol */
-       nf_ct_iterate_cleanup(kill_l4proto, l4proto);
+       rtnl_lock();
+       for_each_net(net)
+               nf_ct_iterate_cleanup(net, kill_l4proto, l4proto);
+       rtnl_unlock();
 }
 EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_unregister);