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Date: Tue, 17 Apr 2012 18:22:42 +0800
From: Gao feng <gaofeng@...fujitsu.com>
To: Pablo Neira Ayuso <pablo@...filter.org>
CC: netfilter-devel@...r.kernel.org, netdev@...r.kernel.org,
ebiederm@...ssion.com, serge.hallyn@...onical.com,
dlezcano@...ibm.com
Subject: Re: [PATCH 03/12] netfilter: generic proto sysctl support for net
namespace
于 2012年04月17日 16:58, Pablo Neira Ayuso 写道:
> On Tue, Apr 17, 2012 at 10:56:14AM +0800, Gao feng wrote:
>> register the generic proto's sysctl in pernet_operations.init.
>> and use net->ct.proto.sysctl_generic_timeout replaces nf_ct_generic_timeout.
>>
>> in the after patch,the timeout_nlattr_to_obj will be modified too.
>>
>> Signed-off-by: Gao feng <gaofeng@...fujitsu.com>
>> ---
>> net/netfilter/nf_conntrack_core.c | 6 ++
>> net/netfilter/nf_conntrack_proto_generic.c | 93 +++++++++++++++++++++++++---
>> 2 files changed, 91 insertions(+), 8 deletions(-)
>>
>> diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
>> index 729f157..bf11dd6 100644
>> --- a/net/netfilter/nf_conntrack_core.c
>> +++ b/net/netfilter/nf_conntrack_core.c
>> @@ -1358,6 +1358,7 @@ static void nf_conntrack_cleanup_net(struct net *net)
>> nf_conntrack_tstamp_fini(net);
>> nf_conntrack_acct_fini(net);
>> nf_conntrack_expect_fini(net);
>> + nf_conntrack_proto_generic_net_fini(net);
>> kmem_cache_destroy(net->ct.nf_conntrack_cachep);
>> kfree(net->ct.slabname);
>> free_percpu(net->ct.stat);
>> @@ -1573,6 +1574,9 @@ static int nf_conntrack_init_net(struct net *net)
>> printk(KERN_ERR "Unable to create nf_conntrack_hash\n");
>> goto err_hash;
>> }
>> + ret = nf_conntrack_proto_generic_net_init(net);
>> + if (ret < 0)
>> + goto err_generic;
>> ret = nf_conntrack_expect_init(net);
>> if (ret < 0)
>> goto err_expect;
>> @@ -1600,6 +1604,8 @@ err_tstamp:
>> err_acct:
>> nf_conntrack_expect_fini(net);
>> err_expect:
>> + nf_conntrack_proto_generic_net_fini(net);
>> +err_generic:
>> nf_ct_free_hashtable(net->ct.hash, net->ct.htable_size);
>> err_hash:
>> kmem_cache_destroy(net->ct.nf_conntrack_cachep);
>> diff --git a/net/netfilter/nf_conntrack_proto_generic.c b/net/netfilter/nf_conntrack_proto_generic.c
>> index 835e24c..0d4545b 100644
>> --- a/net/netfilter/nf_conntrack_proto_generic.c
>> +++ b/net/netfilter/nf_conntrack_proto_generic.c
>> @@ -42,7 +42,7 @@ static int generic_print_tuple(struct seq_file *s,
>>
>> static unsigned int *generic_get_timeouts(struct net *net)
>> {
>> - return &nf_ct_generic_timeout;
>> + return &(net->ct.proto.sysctl_generic_timeout);
>> }
>>
>> /* Returns verdict for packet, or -1 for invalid. */
>> @@ -105,11 +105,10 @@ generic_timeout_nla_policy[CTA_TIMEOUT_GENERIC_MAX+1] = {
>> #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
>>
>> #ifdef CONFIG_SYSCTL
>> -static struct ctl_table_header *generic_sysctl_header;
>> static struct ctl_table generic_sysctl_table[] = {
>> {
>> .procname = "nf_conntrack_generic_timeout",
>> - .data = &nf_ct_generic_timeout,
>> + .data = &init_net.ct.proto.sysctl_generic_timeout,
>> .maxlen = sizeof(unsigned int),
>> .mode = 0644,
>> .proc_handler = proc_dointvec_jiffies,
>> @@ -120,7 +119,7 @@ static struct ctl_table generic_sysctl_table[] = {
>> static struct ctl_table generic_compat_sysctl_table[] = {
>> {
>> .procname = "ip_conntrack_generic_timeout",
>> - .data = &nf_ct_generic_timeout,
>> + .data = &init_net.ct.proto.sysctl_generic_timeout,
>> .maxlen = sizeof(unsigned int),
>> .mode = 0644,
>> .proc_handler = proc_dointvec_jiffies,
>> @@ -150,11 +149,89 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_generic __read_mostly =
>> .nla_policy = generic_timeout_nla_policy,
>> },
>> #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
>> +};
>> +
>> +int nf_conntrack_proto_generic_net_init(struct net *net)
>
> Please, check int nf_conntrack_ecache_init(struct net *net) for
> instance on how we're doing the per-net registration of netfilter
> modules.
nf_conntrack_l4proto_generic is registered when loading nf_conntrack module.
so we should register sysctl in nf_conntrack_init_net.
I don't know what's wrong here...
>
> Basically, we register the module only once for the init_net case.
> Then, we register one sysctl per-net.
>
>> +{
>> + struct ctl_table *table;
>> + int ret = 0;
>> #ifdef CONFIG_SYSCTL
>> - .ctl_table_header = &generic_sysctl_header,
>> - .ctl_table = generic_sysctl_table,
>> #ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
>> - .ctl_compat_table = generic_compat_sysctl_table,
>> + struct ctl_table *compat_table;
>> #endif
>> #endif
>> -};
>> + net->ct.proto.sysctl_generic_timeout = nf_ct_generic_timeout;
>> +#ifdef CONFIG_SYSCTL
>> + table = kmemdup(generic_sysctl_table,
>> + sizeof(generic_sysctl_table),
>> + GFP_KERNEL);
>> + if (!table)
>> + return -ENOMEM;
>> +
>> + table[0].data = &net->ct.proto.sysctl_generic_timeout;
>> +
>> + ret = nf_ct_register_net_sysctl(net,
>> + &net->ct.proto.generic_sysctl_header,
>> + nf_net_netfilter_sysctl_path,
>> + table,
>> + NULL);
>> + if (ret < 0) {
>> + printk(KERN_ERR
>> + "nf_conntrack_proto_generic:"
>> + " can't register to sysctl.\n");
>> + kfree(table);
>> + return ret;
>> + }
>> +#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
>> + compat_table = kmemdup(generic_compat_sysctl_table,
>> + sizeof(generic_compat_sysctl_table),
>> + GFP_KERNEL);
>> + if (!compat_table) {
>> + ret = -ENOMEM;
>> + goto out_compat;
>> + }
>> + compat_table[0].data = &net->ct.proto.sysctl_generic_timeout;
>> + ret = nf_ct_register_net_sysctl(net,
>> + &net->ct.proto.generic_compat_header,
>> + nf_net_ipv4_netfilter_sysctl_path,
>> + compat_table,
>> + NULL);
>> + if (ret < 0) {
>> + printk(KERN_ERR
>> + "nf_conntrack_proto_generic:"
>> + " can't register to compat sysctl.\n");
>> + goto out_compat_register;
>> + }
>> +#endif
>> + return 0;
>> +#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
>> +out_compat_register:
>> + kfree(compat_table);
>> +out_compat:
>> + nf_ct_unregister_net_sysctl(&net->ct.proto.generic_sysctl_header,
>> + table,
>> + NULL);
>> +#endif
>> +#endif
>> + return ret;
>> +}
>> +
>> +void nf_conntrack_proto_generic_net_fini(struct net *net)
>> +{
>> +#ifdef CONFIG_SYSCTL
>> + struct ctl_table *table;
>> +#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
>> + struct ctl_table *compat_table;
>> +#endif
>> + table = net->ct.proto.generic_sysctl_header->ctl_table_arg;
>> + nf_ct_unregister_net_sysctl(&net->ct.proto.generic_sysctl_header,
>> + table,
>> + NULL);
>> +#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
>> + compat_table = net->ct.proto.generic_compat_header->ctl_table_arg;
>> + nf_ct_unregister_net_sysctl(&net->ct.proto.generic_compat_header,
>> + compat_table,
>> + NULL);
>> +#endif
>> +#endif
>> +}
>> --
>> 1.7.7.6
>>
>> --
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