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Date: Tue, 10 Mar 2009 11:21:09 +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 3/4] net: netfilter conntrack - add per-net functionality
for SCTP 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_sctp.c | 179 ++++++++++++++++++++++++--------
> 1 file changed, 139 insertions(+), 40 deletions(-)
>
> Index: linux-2.6.git/net/netfilter/nf_conntrack_proto_sctp.c
> ===================================================================
> --- linux-2.6.git.orig/net/netfilter/nf_conntrack_proto_sctp.c
> +++ linux-2.6.git/net/netfilter/nf_conntrack_proto_sctp.c
> @@ -21,6 +21,9 @@
> #include <linux/spinlock.h>
> #include <linux/interrupt.h>
>
> +#include <net/net_namespace.h>
> +#include <net/netns/generic.h>
> +
> #include <net/netfilter/nf_conntrack.h>
> #include <net/netfilter/nf_conntrack_l4proto.h>
> #include <net/netfilter/nf_conntrack_ecache.h>
> @@ -49,16 +52,6 @@ static const char *const sctp_conntrack_
> #define HOURS * 60 MINS
> #define DAYS * 24 HOURS
>
> -static unsigned int sctp_timeouts[SCTP_CONNTRACK_MAX] __read_mostly = {
> - [SCTP_CONNTRACK_CLOSED] = 10 SECS,
> - [SCTP_CONNTRACK_COOKIE_WAIT] = 3 SECS,
> - [SCTP_CONNTRACK_COOKIE_ECHOED] = 3 SECS,
> - [SCTP_CONNTRACK_ESTABLISHED] = 5 DAYS,
> - [SCTP_CONNTRACK_SHUTDOWN_SENT] = 300 SECS / 1000,
> - [SCTP_CONNTRACK_SHUTDOWN_RECD] = 300 SECS / 1000,
> - [SCTP_CONNTRACK_SHUTDOWN_ACK_SENT] = 3 SECS,
> -};
> -
> #define sNO SCTP_CONNTRACK_NONE
> #define sCL SCTP_CONNTRACK_CLOSED
> #define sCW SCTP_CONNTRACK_COOKIE_WAIT
> @@ -130,6 +123,25 @@ static const u8 sctp_conntracks[2][9][SC
> }
> };
>
> +/* this module per-net specifics */
> +static int sctp_net_id;
> +struct sctp_net {
> + unsigned int sctp_timeouts[SCTP_CONNTRACK_MAX];
> +#ifdef CONFIG_SYSCTL
> + struct ctl_table_header *sysctl_header;
> + struct ctl_table *sysctl_table;
> +#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
> + struct ctl_table_header *compat_sysctl_header;
> + struct ctl_table *compat_sysctl_table;
> +#endif
> +#endif
> +};
> +
> +static inline struct sctp_net *sctp_pernet(struct net *net)
> +{
> + return net_generic(net, sctp_net_id);
> +}
> +
> static bool sctp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff,
> struct nf_conntrack_tuple *tuple)
> {
> @@ -297,6 +309,7 @@ static int sctp_packet(struct nf_conn *c
> const struct sctp_chunkhdr *sch;
> struct sctp_chunkhdr _sch;
> u_int32_t offset, count;
> + struct sctp_net *sn;
> unsigned long map[256 / sizeof(unsigned long)] = { 0 };
>
> sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
> @@ -373,7 +386,8 @@ static int sctp_packet(struct nf_conn *c
> }
> write_unlock_bh(&sctp_lock);
>
> - nf_ct_refresh_acct(ct, ctinfo, skb, sctp_timeouts[new_state]);
> + sn = sctp_pernet(nf_ct_net(ct));
> + nf_ct_refresh_acct(ct, ctinfo, skb, sn->sctp_timeouts[new_state]);
>
> if (old_state == SCTP_CONNTRACK_COOKIE_ECHOED &&
> dir == IP_CT_DIR_REPLY &&
> @@ -540,54 +554,49 @@ static int nlattr_to_sctp(struct nlattr
> #endif
>
> #ifdef CONFIG_SYSCTL
> -static unsigned int sctp_sysctl_table_users;
> -static struct ctl_table_header *sctp_sysctl_header;
> +/*
> + * we use these tables as templates when create per-net syctl tables
> + * tables data will be assigned later
> + */
> static struct ctl_table sctp_sysctl_table[] = {
> {
> .procname = "nf_conntrack_sctp_timeout_closed",
> - .data = &sctp_timeouts[SCTP_CONNTRACK_CLOSED],
> .maxlen = sizeof(unsigned int),
> .mode = 0644,
> .proc_handler = proc_dointvec_jiffies,
> },
> {
> .procname = "nf_conntrack_sctp_timeout_cookie_wait",
> - .data = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_WAIT],
> .maxlen = sizeof(unsigned int),
> .mode = 0644,
> .proc_handler = proc_dointvec_jiffies,
> },
> {
> .procname = "nf_conntrack_sctp_timeout_cookie_echoed",
> - .data = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_ECHOED],
> .maxlen = sizeof(unsigned int),
> .mode = 0644,
> .proc_handler = proc_dointvec_jiffies,
> },
> {
> .procname = "nf_conntrack_sctp_timeout_established",
> - .data = &sctp_timeouts[SCTP_CONNTRACK_ESTABLISHED],
> .maxlen = sizeof(unsigned int),
> .mode = 0644,
> .proc_handler = proc_dointvec_jiffies,
> },
> {
> .procname = "nf_conntrack_sctp_timeout_shutdown_sent",
> - .data = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT],
> .maxlen = sizeof(unsigned int),
> .mode = 0644,
> .proc_handler = proc_dointvec_jiffies,
> },
> {
> .procname = "nf_conntrack_sctp_timeout_shutdown_recd",
> - .data = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD],
> .maxlen = sizeof(unsigned int),
> .mode = 0644,
> .proc_handler = proc_dointvec_jiffies,
> },
> {
> .procname = "nf_conntrack_sctp_timeout_shutdown_ack_sent",
> - .data = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT],
> .maxlen = sizeof(unsigned int),
> .mode = 0644,
> .proc_handler = proc_dointvec_jiffies,
> @@ -601,49 +610,42 @@ static struct ctl_table sctp_sysctl_tabl
> static struct ctl_table sctp_compat_sysctl_table[] = {
> {
> .procname = "ip_conntrack_sctp_timeout_closed",
> - .data = &sctp_timeouts[SCTP_CONNTRACK_CLOSED],
> .maxlen = sizeof(unsigned int),
> .mode = 0644,
> .proc_handler = proc_dointvec_jiffies,
> },
> {
> .procname = "ip_conntrack_sctp_timeout_cookie_wait",
> - .data = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_WAIT],
> .maxlen = sizeof(unsigned int),
> .mode = 0644,
> .proc_handler = proc_dointvec_jiffies,
> },
> {
> .procname = "ip_conntrack_sctp_timeout_cookie_echoed",
> - .data = &sctp_timeouts[SCTP_CONNTRACK_COOKIE_ECHOED],
> .maxlen = sizeof(unsigned int),
> .mode = 0644,
> .proc_handler = proc_dointvec_jiffies,
> },
> {
> .procname = "ip_conntrack_sctp_timeout_established",
> - .data = &sctp_timeouts[SCTP_CONNTRACK_ESTABLISHED],
> .maxlen = sizeof(unsigned int),
> .mode = 0644,
> .proc_handler = proc_dointvec_jiffies,
> },
> {
> .procname = "ip_conntrack_sctp_timeout_shutdown_sent",
> - .data = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT],
> .maxlen = sizeof(unsigned int),
> .mode = 0644,
> .proc_handler = proc_dointvec_jiffies,
> },
> {
> .procname = "ip_conntrack_sctp_timeout_shutdown_recd",
> - .data = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD],
> .maxlen = sizeof(unsigned int),
> .mode = 0644,
> .proc_handler = proc_dointvec_jiffies,
> },
> {
> .procname = "ip_conntrack_sctp_timeout_shutdown_ack_sent",
> - .data = &sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT],
> .maxlen = sizeof(unsigned int),
> .mode = 0644,
> .proc_handler = proc_dointvec_jiffies,
> @@ -653,7 +655,7 @@ static struct ctl_table sctp_compat_sysc
> }
> };
> #endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
> -#endif
> +#endif /* CONFIG_SYSCTL */
>
> static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 __read_mostly = {
> .l3proto = PF_INET,
> @@ -673,14 +675,6 @@ static struct nf_conntrack_l4proto nf_co
> .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
> .nla_policy = nf_ct_port_nla_policy,
> #endif
> -#ifdef CONFIG_SYSCTL
> - .ctl_table_users = &sctp_sysctl_table_users,
> - .ctl_table_header = &sctp_sysctl_header,
> - .ctl_table = sctp_sysctl_table,
> -#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
> - .ctl_compat_table = sctp_compat_sysctl_table,
> -#endif
> -#endif
> };
>
> static struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 __read_mostly = {
> @@ -701,21 +695,123 @@ static struct nf_conntrack_l4proto nf_co
> .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
> .nla_policy = nf_ct_port_nla_policy,
> #endif
> +};
> +
> +static __net_init int sctp_net_init(struct net *net)
> +{
> + struct sctp_net *sn;
> + int err;
> +
> + sn = kmalloc(sizeof(*sn), GFP_KERNEL);
> + if (!sn)
> + return -ENOMEM;
> +
> + /* default values */
> + sn->sctp_timeouts[SCTP_CONNTRACK_CLOSED] = 10 SECS;
> + sn->sctp_timeouts[SCTP_CONNTRACK_COOKIE_WAIT] = 3 SECS;
> + sn->sctp_timeouts[SCTP_CONNTRACK_COOKIE_ECHOED] = 3 SECS;
> + sn->sctp_timeouts[SCTP_CONNTRACK_ESTABLISHED] = 5 DAYS;
> + sn->sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT] = 300 SECS / 1000;
> + sn->sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD] = 300 SECS / 1000;
> + sn->sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT] = 3 SECS;
> +
> + err = net_assign_generic(net, sctp_net_id, sn);
> + if (err)
> + goto out;
> +
> #ifdef CONFIG_SYSCTL
> - .ctl_table_users = &sctp_sysctl_table_users,
> - .ctl_table_header = &sctp_sysctl_header,
> - .ctl_table = sctp_sysctl_table,
> + err = -ENOMEM;
> + sn->sysctl_table = kmemdup(sctp_sysctl_table,
> + sizeof(sctp_sysctl_table), GFP_KERNEL);
> + if (!sn->sysctl_table)
> + goto out;
> +
> + sn->sysctl_table[0].data = &sn->sctp_timeouts[SCTP_CONNTRACK_CLOSED];
> + sn->sysctl_table[1].data = &sn->sctp_timeouts[SCTP_CONNTRACK_COOKIE_WAIT];
> + sn->sysctl_table[2].data = &sn->sctp_timeouts[SCTP_CONNTRACK_COOKIE_ECHOED];
> + sn->sysctl_table[3].data = &sn->sctp_timeouts[SCTP_CONNTRACK_ESTABLISHED];
> + sn->sysctl_table[4].data = &sn->sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT];
> + sn->sysctl_table[5].data = &sn->sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD];
> + sn->sysctl_table[6].data = &sn->sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT];
> +
> + sn->sysctl_header = register_net_sysctl_table(net,
> + nf_net_netfilter_sysctl_path, sn->sysctl_table);
> + if (!sn->sysctl_header)
> + goto out_free;
> +
> +#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
> + sn->compat_sysctl_table = kmemdup(sctp_compat_sysctl_table,
> + sizeof(sctp_compat_sysctl_table), GFP_KERNEL);
> + if (!sn->compat_sysctl_table)
> + goto out_sysctl;
> +
> + sn->compat_sysctl_table[0].data = &sn->sctp_timeouts[SCTP_CONNTRACK_CLOSED];
> + sn->compat_sysctl_table[1].data = &sn->sctp_timeouts[SCTP_CONNTRACK_COOKIE_WAIT];
> + sn->compat_sysctl_table[2].data = &sn->sctp_timeouts[SCTP_CONNTRACK_COOKIE_ECHOED];
> + sn->compat_sysctl_table[3].data = &sn->sctp_timeouts[SCTP_CONNTRACK_ESTABLISHED];
> + sn->compat_sysctl_table[4].data = &sn->sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT];
> + sn->compat_sysctl_table[5].data = &sn->sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD];
> + sn->compat_sysctl_table[6].data = &sn->sctp_timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT];
> +
> + sn->compat_sysctl_header = register_net_sysctl_table(net,
> + nf_net_ipv4_netfilter_sysctl_path, sn->compat_sysctl_table);
> + if (!sn->compat_sysctl_header)
> + goto out_free_compat;
> +#endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
> +#endif /* CONFIG_SYSCTL */
> +
> + return 0;
> +
> +#ifdef CONFIG_SYSCTL
> +
> +#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
> +out_free_compat:
> + kfree(sn->compat_sysctl_table);
> +#endif
> +out_sysctl:
> + unregister_net_sysctl_table(sn->sysctl_header);
> +out_free:
> + kfree(sn->sysctl_table);
> +#endif
> +
> +out:
> + kfree(sn);
> + return err;
> +}
> +
> +static __net_exit void sctp_net_exit(struct net *net)
> +{
> + struct sctp_net *sn = sctp_pernet(net);
> +#ifdef CONFIG_SYSCTL
> + unregister_net_sysctl_table(sn->sysctl_header);
> +#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
> + unregister_net_sysctl_table(sn->compat_sysctl_header);
> + kfree(sn->compat_sysctl_table);
> +#endif
> + kfree(sn->sysctl_table);
> #endif
> + kfree(sn);
> +
> + net_assign_generic(net, sctp_net_id, NULL);
> +}
> +
> +static struct pernet_operations sctp_net_ops = {
> + .init = sctp_net_init,
> + .exit = sctp_net_exit,
> };
>
> static int __init nf_conntrack_proto_sctp_init(void)
> {
> int ret;
>
> + ret = register_pernet_gen_device(&sctp_net_id, &sctp_net_ops);
>
register_pernet_gen_subsys ?
> + if (ret < 0)
> + goto out;
> +
> ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp4);
> if (ret) {
> printk("nf_conntrack_l4proto_sctp4: protocol register failed\n");
> - goto out;
> + goto cleanup_net;
> }
> ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp6);
> if (ret) {
> @@ -727,12 +823,15 @@ static int __init nf_conntrack_proto_sct
>
> cleanup_sctp4:
> nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
> + cleanup_net:
> + unregister_pernet_gen_device(sctp_net_id, &sctp_net_ops);
> out:
> return ret;
> }
>
> static void __exit nf_conntrack_proto_sctp_fini(void)
> {
> + unregister_pernet_gen_device(sctp_net_id, &sctp_net_ops);
> nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp6);
> nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
> }
>
> --
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