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Message-ID: <4FBD95AA.8070301@cn.fujitsu.com>
Date: Thu, 24 May 2012 09:58:02 +0800
From: Gao feng <gaofeng@...fujitsu.com>
To: Pablo Neira Ayuso <pablo@...filter.org>
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
于 2012年05月23日 18:29, Pablo Neira Ayuso 写道:
> 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.
Get it ;)
>
>> #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?
Because l3proto_ipv6 doesn't need sysctl,so l3proto_ipv6's nf_ip_net is NULL,
please see function nf_ct_l3proto_net above.
>
>> +
>> +#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.
>
Get it.
thanks
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