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Date: Wed, 23 May 2012 12:29:10 +0200
From: Pablo Neira Ayuso <pablo@...filter.org>
To: Gao feng <gaofeng@...fujitsu.com>
Cc: netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
serge.hallyn@...onical.com, ebiederm@...ssion.com,
dlezcano@...ibm.com
Subject: Re: [PATCH 03/17] netfilter: add namespace support for l3proto
On Mon, May 14, 2012 at 04:52:13PM +0800, Gao feng wrote:
> -Add the struct net as param of nf_conntrack_l3proto_(un)register.
> register or unregister the l3proto only when the net is init_net.
>
> -The new struct nf_ip_net is used to store the sysctl header and data
> of l3proto_ipv4,l4proto_tcp(6),l4proto_udp(6),l4proto_icmp(v6).
> because the protos such tcp and tcp6 use the same data,so making
> nf_ip_net as a field of netns_ct is the easiest way to manager it.
>
> -nf_ct_l3proto_register_sysctl call init_net to initial the pernet data
> of l3proto.
>
> -nf_ct_l3proto_net is used to get the pernet data of l3proto.
>
> -export nf_conntrack_l3proto_(un)register
>
> -use init_net as param of nf_conntrack_l3proto_(un)register.
>
> Acked-by: Eric W. Biederman <ebiederm@...ssion.com>
> Signed-off-by: Gao feng <gaofeng@...fujitsu.com>
> ---
> include/net/netfilter/nf_conntrack_l3proto.h | 6 +-
> include/net/netns/conntrack.h | 8 ++
> net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c | 6 +-
> net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c | 6 +-
> net/netfilter/nf_conntrack_proto.c | 127 +++++++++++++++---------
> 5 files changed, 97 insertions(+), 56 deletions(-)
>
> diff --git a/include/net/netfilter/nf_conntrack_l3proto.h b/include/net/netfilter/nf_conntrack_l3proto.h
> index 9766005..d6df8c7 100644
> --- a/include/net/netfilter/nf_conntrack_l3proto.h
> +++ b/include/net/netfilter/nf_conntrack_l3proto.h
> @@ -79,8 +79,10 @@ struct nf_conntrack_l3proto {
> extern struct nf_conntrack_l3proto __rcu *nf_ct_l3protos[AF_MAX];
>
> /* Protocol registration. */
> -extern int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto);
> -extern void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto);
> +extern int nf_conntrack_l3proto_register(struct net *net,
> + struct nf_conntrack_l3proto *proto);
> +extern void nf_conntrack_l3proto_unregister(struct net *net,
> + struct nf_conntrack_l3proto *proto);
> extern struct nf_conntrack_l3proto *nf_ct_l3proto_find_get(u_int16_t l3proto);
> extern void nf_ct_l3proto_put(struct nf_conntrack_l3proto *p);
>
> diff --git a/include/net/netns/conntrack.h b/include/net/netns/conntrack.h
> index 1f53038..94992e9 100644
> --- a/include/net/netns/conntrack.h
> +++ b/include/net/netns/conntrack.h
> @@ -20,6 +20,13 @@ struct nf_proto_net {
> unsigned int users;
> };
>
> +struct nf_ip_net {
> +#if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
> + struct ctl_table_header *ctl_table_header;
> + struct ctl_table *ctl_table;
> +#endif
> +};
> +
> struct netns_ct {
> atomic_t count;
> unsigned int expect_count;
> @@ -40,6 +47,7 @@ struct netns_ct {
> unsigned int sysctl_log_invalid; /* Log invalid packets */
> int sysctl_auto_assign_helper;
> bool auto_assign_helper_warned;
> + struct nf_ip_net proto;
^^^^^
please, rename this to something like nf_ct_proto.
> #ifdef CONFIG_SYSCTL
> struct ctl_table_header *sysctl_header;
> struct ctl_table_header *acct_sysctl_header;
> diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
> index 46ec515..0c0fb90 100644
> --- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
> +++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
> @@ -409,7 +409,7 @@ static int __init nf_conntrack_l3proto_ipv4_init(void)
> goto cleanup_udp;
> }
>
> - ret = nf_conntrack_l3proto_register(&nf_conntrack_l3proto_ipv4);
> + ret = nf_conntrack_l3proto_register(&init_net, &nf_conntrack_l3proto_ipv4);
> if (ret < 0) {
> pr_err("nf_conntrack_ipv4: can't register ipv4\n");
> goto cleanup_icmp;
> @@ -432,7 +432,7 @@ static int __init nf_conntrack_l3proto_ipv4_init(void)
> nf_unregister_hooks(ipv4_conntrack_ops, ARRAY_SIZE(ipv4_conntrack_ops));
> #endif
> cleanup_ipv4:
> - nf_conntrack_l3proto_unregister(&nf_conntrack_l3proto_ipv4);
> + nf_conntrack_l3proto_unregister(&init_net, &nf_conntrack_l3proto_ipv4);
> cleanup_icmp:
> nf_conntrack_l4proto_unregister(&init_net, &nf_conntrack_l4proto_icmp);
> cleanup_udp:
> @@ -451,7 +451,7 @@ static void __exit nf_conntrack_l3proto_ipv4_fini(void)
> nf_conntrack_ipv4_compat_fini();
> #endif
> nf_unregister_hooks(ipv4_conntrack_ops, ARRAY_SIZE(ipv4_conntrack_ops));
> - nf_conntrack_l3proto_unregister(&nf_conntrack_l3proto_ipv4);
> + nf_conntrack_l3proto_unregister(&init_net, &nf_conntrack_l3proto_ipv4);
> nf_conntrack_l4proto_unregister(&init_net, &nf_conntrack_l4proto_icmp);
> nf_conntrack_l4proto_unregister(&init_net, &nf_conntrack_l4proto_udp4);
> nf_conntrack_l4proto_unregister(&init_net, &nf_conntrack_l4proto_tcp4);
> diff --git a/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c b/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c
> index 55f379f..6cfbe7b 100644
> --- a/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c
> +++ b/net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c
> @@ -359,7 +359,7 @@ static int __init nf_conntrack_l3proto_ipv6_init(void)
> goto cleanup_udp;
> }
>
> - ret = nf_conntrack_l3proto_register(&nf_conntrack_l3proto_ipv6);
> + ret = nf_conntrack_l3proto_register(&init_net, &nf_conntrack_l3proto_ipv6);
> if (ret < 0) {
> pr_err("nf_conntrack_ipv6: can't register ipv6\n");
> goto cleanup_icmpv6;
> @@ -375,7 +375,7 @@ static int __init nf_conntrack_l3proto_ipv6_init(void)
> return ret;
>
> cleanup_ipv6:
> - nf_conntrack_l3proto_unregister(&nf_conntrack_l3proto_ipv6);
> + nf_conntrack_l3proto_unregister(&init_net, &nf_conntrack_l3proto_ipv6);
> cleanup_icmpv6:
> nf_conntrack_l4proto_unregister(&init_net, &nf_conntrack_l4proto_icmpv6);
> cleanup_udp:
> @@ -389,7 +389,7 @@ static void __exit nf_conntrack_l3proto_ipv6_fini(void)
> {
> synchronize_net();
> nf_unregister_hooks(ipv6_conntrack_ops, ARRAY_SIZE(ipv6_conntrack_ops));
> - nf_conntrack_l3proto_unregister(&nf_conntrack_l3proto_ipv6);
> + nf_conntrack_l3proto_unregister(&init_net, &nf_conntrack_l3proto_ipv6);
> nf_conntrack_l4proto_unregister(&init_net, &nf_conntrack_l4proto_icmpv6);
> nf_conntrack_l4proto_unregister(&init_net, &nf_conntrack_l4proto_udp6);
> nf_conntrack_l4proto_unregister(&init_net, &nf_conntrack_l4proto_tcp6);
> diff --git a/net/netfilter/nf_conntrack_proto.c b/net/netfilter/nf_conntrack_proto.c
> index 6d68727..7ee6653 100644
> --- a/net/netfilter/nf_conntrack_proto.c
> +++ b/net/netfilter/nf_conntrack_proto.c
> @@ -170,85 +170,116 @@ static int kill_l4proto(struct nf_conn *i, void *data)
> nf_ct_l3num(i) == l4proto->l3proto;
> }
>
> -static int nf_ct_l3proto_register_sysctl(struct nf_conntrack_l3proto *l3proto)
> +static struct nf_ip_net *nf_ct_l3proto_net(struct net *net,
> + struct nf_conntrack_l3proto *l3proto)
> +{
> + if (l3proto->l3proto == PF_INET)
> + return &net->ct.proto;
> + else
> + return NULL;
> +}
> +
> +static int nf_ct_l3proto_register_sysctl(struct net *net,
> + struct nf_conntrack_l3proto *l3proto)
> {
> int err = 0;
> + struct nf_ip_net *in = nf_ct_l3proto_net(net, l3proto);
>
> -#ifdef CONFIG_SYSCTL
> - if (l3proto->ctl_table != NULL) {
> - err = nf_ct_register_sysctl(&init_net,
> - &l3proto->ctl_table_header,
> + if (in == NULL)
> + return 0;
Under what circunstances that in be NULL?
> +
> +#if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
> + if (in->ctl_table != NULL) {
> + err = nf_ct_register_sysctl(net,
> + &in->ctl_table_header,
> l3proto->ctl_table_path,
> - l3proto->ctl_table, NULL);
> + in->ctl_table,
> + NULL);
> + if (err < 0) {
> + kfree(in->ctl_table);
> + in->ctl_table = NULL;
do we need this extra NULL assignment?
> + }
> }
> #endif
> return err;
> }
>
> -static void nf_ct_l3proto_unregister_sysctl(struct nf_conntrack_l3proto *l3proto)
> +static void nf_ct_l3proto_unregister_sysctl(struct net *net,
> + struct nf_conntrack_l3proto *l3proto)
> {
> -#ifdef CONFIG_SYSCTL
> - if (l3proto->ctl_table_header != NULL)
> - nf_ct_unregister_sysctl(&l3proto->ctl_table_header,
> - &l3proto->ctl_table, NULL);
> + struct nf_ip_net *in = nf_ct_l3proto_net(net, l3proto);
> +
> + if (in == NULL)
> + return;
> +#if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
> + if (in->ctl_table_header != NULL)
> + nf_ct_unregister_sysctl(&in->ctl_table_header,
> + &in->ctl_table,
> + NULL);
> #endif
> }
>
> -int nf_conntrack_l3proto_register(struct nf_conntrack_l3proto *proto)
> +int nf_conntrack_l3proto_register(struct net *net,
> + struct nf_conntrack_l3proto *proto)
> {
> int ret = 0;
> - struct nf_conntrack_l3proto *old;
> -
> - if (proto->l3proto >= AF_MAX)
> - return -EBUSY;
>
> - if (proto->tuple_to_nlattr && !proto->nlattr_tuple_size)
> - return -EINVAL;
> + if (net == &init_net) {
Same things as in previous patch. Move...
if (net == &init_net) {
... this code ...
}
into some static int nf_conntrack_l3proto_register_net function.
> + struct nf_conntrack_l3proto *old;
>
> - mutex_lock(&nf_ct_proto_mutex);
> - old = rcu_dereference_protected(nf_ct_l3protos[proto->l3proto],
> - lockdep_is_held(&nf_ct_proto_mutex));
> - if (old != &nf_conntrack_l3proto_generic) {
> - ret = -EBUSY;
> - goto out_unlock;
> - }
> + if (proto->l3proto >= AF_MAX)
> + return -EBUSY;
>
> - ret = nf_ct_l3proto_register_sysctl(proto);
> - if (ret < 0)
> - goto out_unlock;
> + if (proto->tuple_to_nlattr && !proto->nlattr_tuple_size)
> + return -EINVAL;
>
> - if (proto->nlattr_tuple_size)
> - proto->nla_size = 3 * proto->nlattr_tuple_size();
> + mutex_lock(&nf_ct_proto_mutex);
> + old = rcu_dereference_protected(nf_ct_l3protos[proto->l3proto],
> + lockdep_is_held(&nf_ct_proto_mutex));
> + if (old != &nf_conntrack_l3proto_generic) {
> + ret = -EBUSY;
> + goto out_unlock;
> + }
>
> - rcu_assign_pointer(nf_ct_l3protos[proto->l3proto], proto);
> + if (proto->nlattr_tuple_size)
> + proto->nla_size = 3 * proto->nlattr_tuple_size();
>
> + rcu_assign_pointer(nf_ct_l3protos[proto->l3proto], proto);
> out_unlock:
> - mutex_unlock(&nf_ct_proto_mutex);
> - return ret;
> + mutex_unlock(&nf_ct_proto_mutex);
> + if (ret < 0)
> + return ret;
> + }
> + if (proto->init_net) {
> + ret = proto->init_net(net);
> + if (ret < 0)
> + return ret;
> + }
> + return nf_ct_l3proto_register_sysctl(net, proto);
> }
> EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_register);
>
> -void nf_conntrack_l3proto_unregister(struct nf_conntrack_l3proto *proto)
> +void nf_conntrack_l3proto_unregister(struct net *net,
> + struct nf_conntrack_l3proto *proto)
> {
> - struct net *net;
> -
> - BUG_ON(proto->l3proto >= AF_MAX);
> + if (net == &init_net) {
> + BUG_ON(proto->l3proto >= AF_MAX);
Same thing as above.
>
> - mutex_lock(&nf_ct_proto_mutex);
> - BUG_ON(rcu_dereference_protected(nf_ct_l3protos[proto->l3proto],
> - lockdep_is_held(&nf_ct_proto_mutex)
> - ) != proto);
> - rcu_assign_pointer(nf_ct_l3protos[proto->l3proto],
> - &nf_conntrack_l3proto_generic);
> - nf_ct_l3proto_unregister_sysctl(proto);
> - mutex_unlock(&nf_ct_proto_mutex);
> + mutex_lock(&nf_ct_proto_mutex);
> + BUG_ON(rcu_dereference_protected(nf_ct_l3protos[proto->l3proto],
> + lockdep_is_held(&nf_ct_proto_mutex)
> + ) != proto);
> + rcu_assign_pointer(nf_ct_l3protos[proto->l3proto],
> + &nf_conntrack_l3proto_generic);
> + mutex_unlock(&nf_ct_proto_mutex);
>
> - synchronize_rcu();
> + synchronize_rcu();
> + }
> + nf_ct_l3proto_unregister_sysctl(net, proto);
>
> /* Remove all contrack entries for this protocol */
> rtnl_lock();
> - for_each_net(net)
> - nf_ct_iterate_cleanup(net, kill_l3proto, proto);
> + nf_ct_iterate_cleanup(net, kill_l3proto, proto);
> rtnl_unlock();
> }
> EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_unregister);
> --
> 1.7.7.6
>
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