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Message-ID: <20090316210339.GL7551@localhost>
Date: Tue, 17 Mar 2009 00:03:39 +0300
From: Cyrill Gorcunov <gorcunov@...il.com>
To: Patrick McHardy <kaber@...sh.net>
Cc: davem@...emloft.net, daniel.lezcano@...e.fr,
netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
xemul@...nvz.org, adobriyan@...il.com
Subject: Re: [RFC v2 3/7] net: netfilter conntrack - add per-net
functionality for SCTP protocol
[Patrick McHardy - Mon, Mar 16, 2009 at 07:29:02PM +0100]
...
> Its better than the macro and I don't really see a better way, so
> this is fine with me. About the other patches - I just stopped at
> SCTP since it was the first one I truely didn't like :)
>
Here is an updated version of the patch with assignment in cycle.
Please review. If all this series become a mess which hard to unwind
(ie what version of patch is last, which is not) -- I could resend
the whole series (excluding already applied). Just say. Thanks!
---
From: Cyrill Gorcunov <gorcunov@...nvz.org>
Subject: [RFC v2 3/7] net: netfilter conntrack - add per-net functionality for SCTP protocol
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 +554,46 @@ 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;
+/* templates, data 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 +607,42 @@ 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 +652,7 @@ 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 +672,6 @@ 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 +692,126 @@ 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;
+
+ /*
+ * Pin per-net data to sysctl tables
+ *
+ * We allocate new ctrl tables from predefined templates
+ * and then assign .data fields iteratively, we allowed
+ * to do so since SCTP_CONNTRACK_... (enum sctp_conntrack)
+ * is a part of userspace ABI and it's hardly that the enum
+ * entries will be rearranged
+ */
+
#ifdef CONFIG_SYSCTL
- .ctl_table_users = &sctp_sysctl_table_users,
- .ctl_table_header = &sctp_sysctl_header,
- .ctl_table = sctp_sysctl_table,
+ {
+ int i;
+ err = -ENOMEM;
+ sn->sysctl_table = kmemdup(sctp_sysctl_table,
+ sizeof(sctp_sysctl_table), GFP_KERNEL);
+ if (!sn->sysctl_table)
+ goto out;
+
+ for (i = SCTP_CONNTRACK_CLOSED; i < SCTP_CONNTRACK_MAX; i++)
+ sn->sysctl_table[i - 1].data = &sn->sctp_timeouts[i];
+
+ 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;
+
+ for (i = SCTP_CONNTRACK_CLOSED; i < SCTP_CONNTRACK_MAX; i++)
+ sn->compat_sysctl_table[err - 1].data = &sn->sctp_timeouts[i];
+
+ 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_subsys(&sctp_net_id, &sctp_net_ops);
+ 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_subsys(sctp_net_id, &sctp_net_ops);
out:
return ret;
}
static void __exit nf_conntrack_proto_sctp_fini(void)
{
+ unregister_pernet_gen_subsys(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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