netdev - Re: [PATCH net-next v2 06/12] netfilter: merge udpv[4,6]_net_init into udp_net

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Date:	Sat, 16 Jun 2012 13:22:59 +0200
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	Gao feng <gaofeng@...fujitsu.com>
Cc:	netdev@...r.kernel.org, netfilter-devel@...r.kernel.org
Subject: Re: [PATCH net-next v2 06/12] netfilter: merge udpv[4,6]_net_init
 into udp_net_init

On Sat, Jun 16, 2012 at 11:41:17AM +0800, Gao feng wrote:
> merge udpv4_net_init and udpv6_net_init into udp_net_init to
> reduce the redundancy codes.
>
> and use nf_proto_net.users to identify if it's the first time
> we use the nf_proto_net. when it's the first time,we will
> initialized it.
>
> Signed-off-by: Gao feng <gaofeng@...fujitsu.com>
> ---
>  net/netfilter/nf_conntrack_proto_udp.c |   56 ++++++++++---------------------
>  1 files changed, 18 insertions(+), 38 deletions(-)
>
> diff --git a/net/netfilter/nf_conntrack_proto_udp.c b/net/netfilter/nf_conntrack_proto_udp.c
> index 2b978e6..61bca4f 100644
> --- a/net/netfilter/nf_conntrack_proto_udp.c
> +++ b/net/netfilter/nf_conntrack_proto_udp.c
> @@ -270,52 +270,32 @@ static int udp_kmemdup_compat_sysctl_table(struct nf_proto_net *pn)
>  	return 0;
>  }
>
> -static void udp_init_net_data(struct nf_udp_net *un)
> +static int udp_init_net(struct net *net, u_int16_t proto)
>  {
> -	int i;
> -#ifdef CONFIG_SYSCTL
> -	if (!un->pn.ctl_table) {
> -#else
> -	if (!un->pn.users++) {
> -#endif
> +	int ret;
> +	struct nf_udp_net *un = udp_pernet(net);
> +	struct nf_proto_net *pn = &un->pn;
> +
> +	if (!pn->users) {
> +		int i;
>  		for (i = 0; i < UDP_CT_MAX; i++)
>  			un->timeouts[i] = udp_timeouts[i];
>  	}
> -}
> -
> -static int udpv4_init_net(struct net *net, u_int16_t proto)
> -{
> -	int ret;
> -	struct nf_udp_net *un = udp_pernet(net);
> -	struct nf_proto_net *pn = (struct nf_proto_net *)un;
>
> -	udp_init_net_data(un);
> +	if (proto == AF_INET) {

I think we can remove that u_int16_t proto that I proposed to make
something like:

static int udp_kmemdup_compat_sysctl_table(struct nf_proto_net *pn)
{
#ifdef CONFIG_SYSCTL
#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
        struct nf_udp_net *un = (struct nf_udp_net *)pn;
+
+       if (pn->ctl_compat_table)
+               return 0;
+
        pn->ctl_compat_table = kmemdup(udp_compat_sysctl_table,
                                       sizeof(udp_compat_sysctl_table),
                                       GFP_KERNEL);
        if (!pn->ctl_compat_table)
                return -ENOMEM;

That should be enough to ensure that the compat is registered once. No
matter if it's done by the IPv4 or IPv6 invocation of udp_init_net.

Thus, it will look consistent with udp_kmemdup_sysctl_table.

> +		ret = udp_kmemdup_compat_sysctl_table(pn);
> +		if (ret < 0)
> +			return ret;
>
> -	ret = udp_kmemdup_compat_sysctl_table(pn);
> -	if (ret < 0)
> -		return ret;
> +		ret = udp_kmemdup_sysctl_table(pn);
> +		if (ret < 0)
> +			nf_ct_kfree_compat_sysctl_table(pn);
> +	} else
> +		ret = udp_kmemdup_sysctl_table(pn);
>
> -	ret = udp_kmemdup_sysctl_table(pn);
> -#ifdef CONFIG_SYSCTL
> -#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
> -	if (ret < 0) {
> -		kfree(pn->ctl_compat_table);
> -		pn->ctl_compat_table = NULL;
> -	}
> -#endif
> -#endif
>  	return ret;
>  }
>
> -static int udpv6_init_net(struct net *net, u_int16_t proto)
> -{
> -	struct nf_udp_net *un = udp_pernet(net);
> -	struct nf_proto_net *pn = (struct nf_proto_net *)un;
> -
> -	udp_init_net_data(un);
> -	return udp_kmemdup_sysctl_table(pn);
> -}
> -
>  struct nf_conntrack_l4proto nf_conntrack_l4proto_udp4 __read_mostly =
>  {
>  	.l3proto		= PF_INET,
> @@ -343,7 +323,7 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_udp4 __read_mostly =
>  		.nla_policy	= udp_timeout_nla_policy,
>  	},
>  #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
> -	.init_net		= udpv4_init_net,
> +	.init_net		= udp_init_net,
>  };
>  EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_udp4);
>
> @@ -374,6 +354,6 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_udp6 __read_mostly =
>  		.nla_policy	= udp_timeout_nla_policy,
>  	},
>  #endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
> -	.init_net		= udpv6_init_net,
> +	.init_net		= udp_init_net,
>  };
>  EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_udp6);
> --
> 1.7.7.6
>
> --
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