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Date: Thu, 24 May 2012 11:52:22 +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 04/17] netfilter: add namespace support for
l4proto_generic
On Thu, May 24, 2012 at 09:13:36AM +0800, Gao feng wrote:
> 于 2012年05月23日 18:32, Pablo Neira Ayuso 写道:
> > On Mon, May 14, 2012 at 04:52:14PM +0800, Gao feng wrote:
> >> implement and export nf_conntrack_proto_generic_[init,fini],
> >> nf_conntrack_[init,cleanup]_net call them to register or unregister
> >> the sysctl of generic proto.
> >>
> >> implement generic_net_init,it's used to initial the pernet
> >> data for generic proto.
> >>
> >> and use nf_generic_net.timeout to replace nf_ct_generic_timeout in
> >> get_timeouts function.
> >>
> >> Acked-by: Eric W. Biederman <ebiederm@...ssion.com>
> >> Signed-off-by: Gao feng <gaofeng@...fujitsu.com>
> >> ---
> >> include/net/netfilter/nf_conntrack_l4proto.h | 2 +
> >> include/net/netns/conntrack.h | 6 +++
> >> net/netfilter/nf_conntrack_core.c | 8 +++-
> >> net/netfilter/nf_conntrack_proto.c | 21 +++++-----
> >> net/netfilter/nf_conntrack_proto_generic.c | 55 ++++++++++++++++++++++++-
> >> 5 files changed, 76 insertions(+), 16 deletions(-)
> >>
> >> diff --git a/include/net/netfilter/nf_conntrack_l4proto.h b/include/net/netfilter/nf_conntrack_l4proto.h
> >> index a93dcd5..0d329b9 100644
> >> --- a/include/net/netfilter/nf_conntrack_l4proto.h
> >> +++ b/include/net/netfilter/nf_conntrack_l4proto.h
> >> @@ -118,6 +118,8 @@ struct nf_conntrack_l4proto {
> >>
> >> /* Existing built-in generic protocol */
> >> extern struct nf_conntrack_l4proto nf_conntrack_l4proto_generic;
> >> +extern int nf_conntrack_proto_generic_init(struct net *net);
> >> +extern void nf_conntrack_proto_generic_fini(struct net *net);
> >>
> >> #define MAX_NF_CT_PROTO 256
> >>
> >> diff --git a/include/net/netns/conntrack.h b/include/net/netns/conntrack.h
> >> index 94992e9..3381b80 100644
> >> --- a/include/net/netns/conntrack.h
> >> +++ b/include/net/netns/conntrack.h
> >> @@ -20,7 +20,13 @@ struct nf_proto_net {
> >> unsigned int users;
> >> };
> >>
> >> +struct nf_generic_net {
> >> + struct nf_proto_net pn;
> >> + unsigned int timeout;
> >> +};
> >> +
> >> struct nf_ip_net {
> >> + struct nf_generic_net generic;
> >> #if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
> >> struct ctl_table_header *ctl_table_header;
> >> struct ctl_table *ctl_table;
> >> diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
> >> index 32c5909..fd33e91 100644
> >> --- a/net/netfilter/nf_conntrack_core.c
> >> +++ b/net/netfilter/nf_conntrack_core.c
> >> @@ -1353,6 +1353,7 @@ static void nf_conntrack_cleanup_net(struct net *net)
> >> }
> >>
> >> nf_ct_free_hashtable(net->ct.hash, net->ct.htable_size);
> >> + nf_conntrack_proto_generic_fini(net);
> >> nf_conntrack_helper_fini(net);
> >> nf_conntrack_timeout_fini(net);
> >> nf_conntrack_ecache_fini(net);
> >> @@ -1586,9 +1587,12 @@ static int nf_conntrack_init_net(struct net *net)
> >> ret = nf_conntrack_helper_init(net);
> >> if (ret < 0)
> >> goto err_helper;
> >> -
> >> + ret = nf_conntrack_proto_generic_init(net);
> >> + if (ret < 0)
> >> + goto err_generic;
> >> return 0;
> >> -
> >> +err_generic:
> >> + nf_conntrack_helper_fini(net);
> >> err_helper:
> >> nf_conntrack_timeout_fini(net);
> >> err_timeout:
> >> diff --git a/net/netfilter/nf_conntrack_proto.c b/net/netfilter/nf_conntrack_proto.c
> >> index 7ee6653..9b4bf6d 100644
> >> --- a/net/netfilter/nf_conntrack_proto.c
> >> +++ b/net/netfilter/nf_conntrack_proto.c
> >> @@ -287,10 +287,16 @@ EXPORT_SYMBOL_GPL(nf_conntrack_l3proto_unregister);
> >> static struct nf_proto_net *nf_ct_l4proto_net(struct net *net,
> >> struct nf_conntrack_l4proto *l4proto)
> >> {
> >> - if (l4proto->net_id)
> >> - return net_generic(net, *l4proto->net_id);
> >> - else
> >> - return NULL;
> >> + switch (l4proto->l4proto) {
> >> + case 255: /* l4proto_generic */
> >> + return (struct nf_proto_net *)&net->ct.proto.generic;
> >> + default:
> >> + if (l4proto->net_id)
> >> + return net_generic(net, *l4proto->net_id);
> >> + else
> >> + return NULL;
> >> + }
> >> + return NULL;
> >> }
> >>
> >> int nf_ct_l4proto_register_sysctl(struct net *net,
> >> @@ -457,11 +463,6 @@ EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_unregister);
> >> int nf_conntrack_proto_init(void)
> >> {
> >> unsigned int i;
> >> - int err;
> >> -
> >> - err = nf_ct_l4proto_register_sysctl(&init_net, &nf_conntrack_l4proto_generic);
> >> - if (err < 0)
> >> - return err;
> >
> > I like that all protocols sysctl are registered by
> > nf_conntrack_proto_init. Can you keep using that?
>
> you mean per-net's generic_proto sysctl are registered by
> nf_conntrack_proto_init?
>
> such as
>
> int nf_conntrack_proto_init(struct net *net)
> {
> ...
> err = nf_ct_l4proto_register_sysctl(net, &nf_conntrack_l4proto_generic);
Yes, all protocol trackers included in nf_conntrack_proto_init:
err = nf_conntrack_proto_generic_init(net);
...
err = nf_conntrack_proto_tcp_init(net);
...
and so on.
> ...
> }
>
> if my understanding is right,my answer is yes we can ;)
>
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