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Date: Tue, 10 Mar 2009 11:19:18 +0100
From: Daniel Lezcano <daniel.lezcano@...e.fr>
To: Cyrill Gorcunov <gorcunov@...il.com>
CC: davem@...emloft.net, kaber@...sh.net, netdev@...r.kernel.org,
linux-next@...r.kernel.org, xemul@...nvz.org, adobriyan@...il.com,
Cyrill Gorcunov <gorcunov@...nvz.org>
Subject: Re: [RFC 2/4] net: netfilter conntrack - add per-net functionality
for DCCP protocol
Cyrill Gorcunov wrote:
> Module specific data moved into per-net site and being allocated/freed
> during net namespace creation/deletion.
>
> Signed-off-by: Cyrill Gorcunov <gorcunov@...nvz.org>
> ---
> net/netfilter/nf_conntrack_proto_dccp.c | 148 ++++++++++++++++++++++++--------
> 1 file changed, 111 insertions(+), 37 deletions(-)
>
> Index: linux-2.6.git/net/netfilter/nf_conntrack_proto_dccp.c
> ===================================================================
> --- linux-2.6.git.orig/net/netfilter/nf_conntrack_proto_dccp.c
> +++ linux-2.6.git/net/netfilter/nf_conntrack_proto_dccp.c
> @@ -16,6 +16,9 @@
> #include <linux/skbuff.h>
> #include <linux/dccp.h>
>
> +#include <net/net_namespace.h>
> +#include <net/netns/generic.h>
> +
> #include <linux/netfilter/nfnetlink_conntrack.h>
> #include <net/netfilter/nf_conntrack.h>
> #include <net/netfilter/nf_conntrack_l4proto.h>
> @@ -23,8 +26,6 @@
>
> static DEFINE_RWLOCK(dccp_lock);
>
> -static int nf_ct_dccp_loose __read_mostly = 1;
> -
> /* Timeouts are based on values from RFC4340:
> *
> * - REQUEST:
> @@ -72,16 +73,6 @@ static int nf_ct_dccp_loose __read_mostl
>
> #define DCCP_MSL (2 * 60 * HZ)
>
> -static unsigned int dccp_timeout[CT_DCCP_MAX + 1] __read_mostly = {
> - [CT_DCCP_REQUEST] = 2 * DCCP_MSL,
> - [CT_DCCP_RESPOND] = 4 * DCCP_MSL,
> - [CT_DCCP_PARTOPEN] = 4 * DCCP_MSL,
> - [CT_DCCP_OPEN] = 12 * 3600 * HZ,
> - [CT_DCCP_CLOSEREQ] = 64 * HZ,
> - [CT_DCCP_CLOSING] = 64 * HZ,
> - [CT_DCCP_TIMEWAIT] = 2 * DCCP_MSL,
> -};
> -
> static const char * const dccp_state_names[] = {
> [CT_DCCP_NONE] = "NONE",
> [CT_DCCP_REQUEST] = "REQUEST",
> @@ -393,6 +384,22 @@ dccp_state_table[CT_DCCP_ROLE_MAX + 1][D
> },
> };
>
> +/* this module per-net specifics */
> +static int dccp_net_id;
> +struct dccp_net {
> + int dccp_loose;
> + unsigned int dccp_timeout[CT_DCCP_MAX + 1];
> +#ifdef CONFIG_SYSCTL
> + struct ctl_table_header *sysctl_header;
> + struct ctl_table *sysctl_table;
> +#endif
> +};
> +
> +static inline struct dccp_net *dccp_pernet(struct net *net)
> +{
> + return net_generic(net, dccp_net_id);
> +}
> +
> static bool dccp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff,
> struct nf_conntrack_tuple *tuple)
> {
> @@ -419,6 +426,7 @@ static bool dccp_new(struct nf_conn *ct,
> unsigned int dataoff)
> {
> struct net *net = nf_ct_net(ct);
> + struct dccp_net *dn;
> struct dccp_hdr _dh, *dh;
> const char *msg;
> u_int8_t state;
> @@ -429,7 +437,8 @@ static bool dccp_new(struct nf_conn *ct,
> state = dccp_state_table[CT_DCCP_ROLE_CLIENT][dh->dccph_type][CT_DCCP_NONE];
> switch (state) {
> default:
> - if (nf_ct_dccp_loose == 0) {
> + dn = dccp_pernet(net);
> + if (dn->dccp_loose == 0) {
> msg = "nf_ct_dccp: not picking up existing connection ";
> goto out_invalid;
> }
> @@ -465,6 +474,7 @@ static int dccp_packet(struct nf_conn *c
> u_int8_t pf, unsigned int hooknum)
> {
> struct net *net = nf_ct_net(ct);
> + struct dccp_net *dn;
> enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
> struct dccp_hdr _dh, *dh;
> u_int8_t type, old_state, new_state;
> @@ -542,7 +552,9 @@ static int dccp_packet(struct nf_conn *c
> ct->proto.dccp.last_pkt = type;
> ct->proto.dccp.state = new_state;
> write_unlock_bh(&dccp_lock);
> - nf_ct_refresh_acct(ct, ctinfo, skb, dccp_timeout[new_state]);
> +
> + dn = dccp_pernet(net);
> + nf_ct_refresh_acct(ct, ctinfo, skb, dn->dccp_timeout[new_state]);
>
> return NF_ACCEPT;
> }
> @@ -660,13 +672,14 @@ static int nlattr_to_dccp(struct nlattr
> #endif
>
> #ifdef CONFIG_SYSCTL
> -static unsigned int dccp_sysctl_table_users;
> -static struct ctl_table_header *dccp_sysctl_header;
> -static ctl_table dccp_sysctl_table[] = {
> +/*
> + * we use it as a template when create per-net syctl table
> + * table data will be assigned later
> + */
> +static struct ctl_table dccp_sysctl_table[] = {
> {
> .ctl_name = CTL_UNNUMBERED,
> .procname = "nf_conntrack_dccp_timeout_request",
> - .data = &dccp_timeout[CT_DCCP_REQUEST],
> .maxlen = sizeof(unsigned int),
> .mode = 0644,
> .proc_handler = proc_dointvec_jiffies,
> @@ -674,7 +687,6 @@ static ctl_table dccp_sysctl_table[] = {
> {
> .ctl_name = CTL_UNNUMBERED,
> .procname = "nf_conntrack_dccp_timeout_respond",
> - .data = &dccp_timeout[CT_DCCP_RESPOND],
> .maxlen = sizeof(unsigned int),
> .mode = 0644,
> .proc_handler = proc_dointvec_jiffies,
> @@ -682,7 +694,6 @@ static ctl_table dccp_sysctl_table[] = {
> {
> .ctl_name = CTL_UNNUMBERED,
> .procname = "nf_conntrack_dccp_timeout_partopen",
> - .data = &dccp_timeout[CT_DCCP_PARTOPEN],
> .maxlen = sizeof(unsigned int),
> .mode = 0644,
> .proc_handler = proc_dointvec_jiffies,
> @@ -690,7 +701,6 @@ static ctl_table dccp_sysctl_table[] = {
> {
> .ctl_name = CTL_UNNUMBERED,
> .procname = "nf_conntrack_dccp_timeout_open",
> - .data = &dccp_timeout[CT_DCCP_OPEN],
> .maxlen = sizeof(unsigned int),
> .mode = 0644,
> .proc_handler = proc_dointvec_jiffies,
> @@ -698,7 +708,6 @@ static ctl_table dccp_sysctl_table[] = {
> {
> .ctl_name = CTL_UNNUMBERED,
> .procname = "nf_conntrack_dccp_timeout_closereq",
> - .data = &dccp_timeout[CT_DCCP_CLOSEREQ],
> .maxlen = sizeof(unsigned int),
> .mode = 0644,
> .proc_handler = proc_dointvec_jiffies,
> @@ -706,7 +715,6 @@ static ctl_table dccp_sysctl_table[] = {
> {
> .ctl_name = CTL_UNNUMBERED,
> .procname = "nf_conntrack_dccp_timeout_closing",
> - .data = &dccp_timeout[CT_DCCP_CLOSING],
> .maxlen = sizeof(unsigned int),
> .mode = 0644,
> .proc_handler = proc_dointvec_jiffies,
> @@ -714,7 +722,6 @@ static ctl_table dccp_sysctl_table[] = {
> {
> .ctl_name = CTL_UNNUMBERED,
> .procname = "nf_conntrack_dccp_timeout_timewait",
> - .data = &dccp_timeout[CT_DCCP_TIMEWAIT],
> .maxlen = sizeof(unsigned int),
> .mode = 0644,
> .proc_handler = proc_dointvec_jiffies,
> @@ -722,8 +729,7 @@ static ctl_table dccp_sysctl_table[] = {
> {
> .ctl_name = CTL_UNNUMBERED,
> .procname = "nf_conntrack_dccp_loose",
> - .data = &nf_ct_dccp_loose,
> - .maxlen = sizeof(nf_ct_dccp_loose),
> + .maxlen = sizeof(int),
> .mode = 0644,
> .proc_handler = proc_dointvec,
> },
> @@ -751,11 +757,6 @@ static struct nf_conntrack_l4proto dccp_
> .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
> .nla_policy = nf_ct_port_nla_policy,
> #endif
> -#ifdef CONFIG_SYSCTL
> - .ctl_table_users = &dccp_sysctl_table_users,
> - .ctl_table_header = &dccp_sysctl_header,
> - .ctl_table = dccp_sysctl_table,
> -#endif
> };
>
> static struct nf_conntrack_l4proto dccp_proto6 __read_mostly = {
> @@ -776,34 +777,107 @@ static struct nf_conntrack_l4proto dccp_
> .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
> .nla_policy = nf_ct_port_nla_policy,
> #endif
> +};
> +
> +static __net_init int dccp_net_init(struct net *net)
> +{
> + struct dccp_net *dn;
> + int err;
> +
> + dn = kmalloc(sizeof(*dn), GFP_KERNEL);
> + if (!dn)
> + return -ENOMEM;
> +
> + /* default values */
> + dn->dccp_loose = 1;
> + dn->dccp_timeout[CT_DCCP_REQUEST] = 2 * DCCP_MSL;
> + dn->dccp_timeout[CT_DCCP_RESPOND] = 4 * DCCP_MSL;
> + dn->dccp_timeout[CT_DCCP_PARTOPEN] = 4 * DCCP_MSL;
> + dn->dccp_timeout[CT_DCCP_OPEN] = 12 * 3600 * HZ;
> + dn->dccp_timeout[CT_DCCP_CLOSEREQ] = 64 * HZ;
> + dn->dccp_timeout[CT_DCCP_CLOSING] = 64 * HZ;
> + dn->dccp_timeout[CT_DCCP_TIMEWAIT] = 2 * DCCP_MSL;
> +
> + err = net_assign_generic(net, dccp_net_id, dn);
> + if (err)
> + goto out;
> +
> #ifdef CONFIG_SYSCTL
> - .ctl_table_users = &dccp_sysctl_table_users,
> - .ctl_table_header = &dccp_sysctl_header,
> - .ctl_table = dccp_sysctl_table,
> + err = -ENOMEM;
> + dn->sysctl_table = kmemdup(dccp_sysctl_table,
> + sizeof(dccp_sysctl_table), GFP_KERNEL);
> + if (!dn->sysctl_table)
> + goto out;
> +
> + dn->sysctl_table[0].data = &dn->dccp_timeout[CT_DCCP_REQUEST];
> + dn->sysctl_table[1].data = &dn->dccp_timeout[CT_DCCP_RESPOND];
> + dn->sysctl_table[2].data = &dn->dccp_timeout[CT_DCCP_PARTOPEN];
> + dn->sysctl_table[3].data = &dn->dccp_timeout[CT_DCCP_OPEN];
> + dn->sysctl_table[4].data = &dn->dccp_timeout[CT_DCCP_CLOSEREQ];
> + dn->sysctl_table[5].data = &dn->dccp_timeout[CT_DCCP_CLOSING];
> + dn->sysctl_table[6].data = &dn->dccp_timeout[CT_DCCP_TIMEWAIT];
> + dn->sysctl_table[7].data = &dn->dccp_loose;
> +
> + dn->sysctl_header = register_net_sysctl_table(net,
> + nf_net_netfilter_sysctl_path, dn->sysctl_table);
> + if (!dn->sysctl_header) {
> + kfree(dn->sysctl_table);
> + goto out;
> + }
> #endif
> +
> + return 0;
> +
> +out:
> + kfree(dn);
> + return err;
> +}
> +
> +static __net_exit void dccp_net_exit(struct net *net)
> +{
> + struct dccp_net *dn = dccp_pernet(net);
> +#ifdef CONFIG_SYSCTL
> + unregister_net_sysctl_table(dn->sysctl_header);
> + kfree(dn->sysctl_table);
> +#endif
> + kfree(dn);
> +
> + net_assign_generic(net, dccp_net_id, NULL);
> +}
> +
> +static struct pernet_operations dccp_net_ops = {
> + .init = dccp_net_init,
> + .exit = dccp_net_exit,
> };
>
> static int __init nf_conntrack_proto_dccp_init(void)
> {
> int err;
>
> - err = nf_conntrack_l4proto_register(&dccp_proto4);
> + err = register_pernet_gen_device(&dccp_net_id, &dccp_net_ops);
>
Shouldn't it be register_pernet_gen_subsys ?
> if (err < 0)
> goto err1;
>
> - err = nf_conntrack_l4proto_register(&dccp_proto6);
> + err = nf_conntrack_l4proto_register(&dccp_proto4);
> if (err < 0)
> goto err2;
> +
> + err = nf_conntrack_l4proto_register(&dccp_proto6);
> + if (err < 0)
> + goto err3;
> return 0;
>
> -err2:
> +err3:
> nf_conntrack_l4proto_unregister(&dccp_proto4);
> +err2:
> + unregister_pernet_gen_device(dccp_net_id, &dccp_net_ops);
> err1:
> return err;
> }
>
> static void __exit nf_conntrack_proto_dccp_fini(void)
> {
> + unregister_pernet_gen_device(dccp_net_id, &dccp_net_ops);
> nf_conntrack_l4proto_unregister(&dccp_proto6);
> nf_conntrack_l4proto_unregister(&dccp_proto4);
> }
>
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