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Date: Thu, 14 Jun 2012 20:13:24 +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 06/10] merge udpv[4,6]_net_init into udp_net_init
On Thu, Jun 14, 2012 at 06:07:21PM +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 | 60 ++++++++++++--------------------
> 1 files changed, 22 insertions(+), 38 deletions(-)
>
> diff --git a/net/netfilter/nf_conntrack_proto_udp.c b/net/netfilter/nf_conntrack_proto_udp.c
> index 2b978e6..480126e 100644
> --- a/net/netfilter/nf_conntrack_proto_udp.c
> +++ b/net/netfilter/nf_conntrack_proto_udp.c
> @@ -239,13 +239,16 @@ static int udp_kmemdup_sysctl_table(struct nf_proto_net *pn)
> {
> #ifdef CONFIG_SYSCTL
> struct nf_udp_net *un = (struct nf_udp_net *)pn;
> +
> if (pn->ctl_table)
> return 0;
> +
> pn->ctl_table = kmemdup(udp_sysctl_table,
> sizeof(udp_sysctl_table),
> GFP_KERNEL);
> if (!pn->ctl_table)
> return -ENOMEM;
> +
I like this cleanup. But you have to make it in a separate patch.
> pn->ctl_table[0].data = &un->timeouts[UDP_CT_UNREPLIED];
> pn->ctl_table[1].data = &un->timeouts[UDP_CT_REPLIED];
> #endif
> @@ -257,6 +260,7 @@ 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;
> +
> pn->ctl_compat_table = kmemdup(udp_compat_sysctl_table,
> sizeof(udp_compat_sysctl_table),
> GFP_KERNEL);
> @@ -270,52 +274,32 @@ 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 = 0;
> + struct nf_udp_net *un = udp_pernet(net);
> + struct nf_proto_net *pn = (struct nf_proto_net *)un;
> +
> + if (pn->users) {
> + int i = 0;
redundant initialization of that i variable.
> 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;
> + if (proto == AF_INET) {
> + ret = udp_kmemdup_compat_sysctl_table(pn);
> + if (ret < 0)
> + return ret;
>
> - udp_init_net_data(un);
> + 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_compat_sysctl_table(pn);
> - if (ret < 0)
> - return ret;
> -
> - 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 +327,7 @@ 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 +358,6 @@ 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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