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netfilter: xtables: generate initial table on-demand

Browse Source 
The static initial tables are pretty large, and after the net
namespace has been instantiated, they just hang around for nothing.
This commit removes them and creates tables on-demand at runtime when
needed.

Size shrinks by 7735 bytes (x86_64).

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
This commit is contained in:
Jan Engelhardt 2009-06-17 22:14:54 +02:00
parent 2b95efe7f6
commit e3eaa9910b
18 changed files with 141 additions and 334 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/linux/netfilter_arp/arp_tables.h
View File

@ -258,6 +258,7 @@ struct arpt_error {
.target.errorname = "ERROR", \
}
extern void *arpt_alloc_initial_table(const struct xt_table *);
extern struct xt_table *arpt_register_table(struct net *net,
const struct xt_table *table,
const struct arpt_replace *repl);

1
include/linux/netfilter_ipv4/ip_tables.h
View File

@ -282,6 +282,7 @@ struct ipt_error {
.target.errorname = "ERROR", \
}
extern void *ipt_alloc_initial_table(const struct xt_table *);
extern unsigned int ipt_do_table(struct sk_buff *skb,
unsigned int hook,
const struct net_device *in,

1
include/linux/netfilter_ipv6/ip6_tables.h
View File

@ -297,6 +297,7 @@ ip6t_get_target(struct ip6t_entry *e)
#include <linux/init.h>
extern void ip6t_init(void) __init;
extern void *ip6t_alloc_initial_table(const struct xt_table *);
extern struct xt_table *ip6t_register_table(struct net *net,
const struct xt_table *table,
const struct ip6t_replace *repl);

7
net/ipv4/netfilter/arp_tables.c
View File

@ -27,6 +27,7 @@
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter_arp/arp_tables.h>
#include "../../netfilter/xt_repldata.h"
MODULE_LICENSE("GPL");
MODULE_AUTHOR("David S. Miller <davem@redhat.com>");
@ -58,6 +59,12 @@ do { \
#define ARP_NF_ASSERT(x)
#endif
void *arpt_alloc_initial_table(const struct xt_table *info)
{
return xt_alloc_initial_table(arpt, ARPT);
}
EXPORT_SYMBOL_GPL(arpt_alloc_initial_table);
static inline int arp_devaddr_compare(const struct arpt_devaddr_info *ap,
const char *hdr_addr, int len)
{

40
net/ipv4/netfilter/arptable_filter.c
View File

@ -6,6 +6,7 @@
*/
#include <linux/module.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter_arp/arp_tables.h>
MODULE_LICENSE("GPL");
@ -15,36 +16,6 @@ MODULE_DESCRIPTION("arptables filter table");
#define FILTER_VALID_HOOKS ((1 << NF_ARP_IN) | (1 << NF_ARP_OUT) | \
(1 << NF_ARP_FORWARD))
static const struct
{
struct arpt_replace repl;
struct arpt_standard entries[3];
struct arpt_error term;
} initial_table __net_initdata = {
.repl = {
.name = "filter",
.valid_hooks = FILTER_VALID_HOOKS,
.num_entries = 4,
.size = sizeof(struct arpt_standard) * 3 + sizeof(struct arpt_error),
.hook_entry = {
[NF_ARP_IN] = 0,
[NF_ARP_OUT] = sizeof(struct arpt_standard),
[NF_ARP_FORWARD] = 2 * sizeof(struct arpt_standard),
},
.underflow = {
[NF_ARP_IN] = 0,
[NF_ARP_OUT] = sizeof(struct arpt_standard),
[NF_ARP_FORWARD] = 2 * sizeof(struct arpt_standard),
},
},
.entries = {
ARPT_STANDARD_INIT(NF_ACCEPT), /* ARP_IN */
ARPT_STANDARD_INIT(NF_ACCEPT), /* ARP_OUT */
ARPT_STANDARD_INIT(NF_ACCEPT), /* ARP_FORWARD */
},
.term = ARPT_ERROR_INIT,
};
static const struct xt_table packet_filter = {
.name = "filter",
.valid_hooks = FILTER_VALID_HOOKS,
@ -68,9 +39,14 @@ static struct nf_hook_ops *arpfilter_ops __read_mostly;
static int __net_init arptable_filter_net_init(struct net *net)
{
/* Register table */
struct arpt_replace *repl;
repl = arpt_alloc_initial_table(&packet_filter);
if (repl == NULL)
return -ENOMEM;
net->ipv4.arptable_filter =
arpt_register_table(net, &packet_filter, &initial_table.repl);
arpt_register_table(net, &packet_filter, repl);
kfree(repl);
if (IS_ERR(net->ipv4.arptable_filter))
return PTR_ERR(net->ipv4.arptable_filter);
return 0;

7
net/ipv4/netfilter/ip_tables.c
View File

@ -28,6 +28,7 @@
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <net/netfilter/nf_log.h>
#include "../../netfilter/xt_repldata.h"
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
@ -66,6 +67,12 @@ do { \
#define inline
#endif
void *ipt_alloc_initial_table(const struct xt_table *info)
{
return xt_alloc_initial_table(ipt, IPT);
}
EXPORT_SYMBOL_GPL(ipt_alloc_initial_table);
/*
We keep a set of rules for each CPU, so we can avoid write-locking
them in the softirq when updating the counters and therefore

46
net/ipv4/netfilter/iptable_filter.c
View File

@ -23,36 +23,6 @@ MODULE_DESCRIPTION("iptables filter table");
(1 << NF_INET_FORWARD) | \
(1 << NF_INET_LOCAL_OUT))
static struct
{
struct ipt_replace repl;
struct ipt_standard entries[3];
struct ipt_error term;
} initial_table __net_initdata = {
.repl = {
.name = "filter",
.valid_hooks = FILTER_VALID_HOOKS,
.num_entries = 4,
.size = sizeof(struct ipt_standard) * 3 + sizeof(struct ipt_error),
.hook_entry = {
[NF_INET_LOCAL_IN] = 0,
[NF_INET_FORWARD] = sizeof(struct ipt_standard),
[NF_INET_LOCAL_OUT] = sizeof(struct ipt_standard) * 2,
},
.underflow = {
[NF_INET_LOCAL_IN] = 0,
[NF_INET_FORWARD] = sizeof(struct ipt_standard),
[NF_INET_LOCAL_OUT] = sizeof(struct ipt_standard) * 2,
},
},
.entries = {
IPT_STANDARD_INIT(NF_ACCEPT), /* LOCAL_IN */
IPT_STANDARD_INIT(NF_ACCEPT), /* FORWARD */
IPT_STANDARD_INIT(NF_ACCEPT), /* LOCAL_OUT */
},
.term = IPT_ERROR_INIT, /* ERROR */
};
static const struct xt_table packet_filter = {
.name = "filter",
.valid_hooks = FILTER_VALID_HOOKS,
@ -86,9 +56,18 @@ module_param(forward, bool, 0000);
static int __net_init iptable_filter_net_init(struct net *net)
{
/* Register table */
struct ipt_replace *repl;
repl = ipt_alloc_initial_table(&packet_filter);
if (repl == NULL)
return -ENOMEM;
/* Entry 1 is the FORWARD hook */
((struct ipt_standard *)repl->entries)[1].target.verdict =
-forward - 1;
net->ipv4.iptable_filter =
ipt_register_table(net, &packet_filter, &initial_table.repl);
ipt_register_table(net, &packet_filter, repl);
kfree(repl);
if (IS_ERR(net->ipv4.iptable_filter))
return PTR_ERR(net->ipv4.iptable_filter);
return 0;
@ -113,9 +92,6 @@ static int __init iptable_filter_init(void)
return -EINVAL;
}
/* Entry 1 is the FORWARD hook */
initial_table.entries[1].target.verdict = -forward - 1;
ret = register_pernet_subsys(&iptable_filter_net_ops);
if (ret < 0)
return ret;

46
net/ipv4/netfilter/iptable_mangle.c
View File

@ -27,43 +27,6 @@ MODULE_DESCRIPTION("iptables mangle table");
(1 << NF_INET_LOCAL_OUT) | \
(1 << NF_INET_POST_ROUTING))
/* Ouch - five different hooks? Maybe this should be a config option..... -- BC */
static const struct
{
struct ipt_replace repl;
struct ipt_standard entries[5];
struct ipt_error term;
} initial_table __net_initdata = {
.repl = {
.name = "mangle",
.valid_hooks = MANGLE_VALID_HOOKS,
.num_entries = 6,
.size = sizeof(struct ipt_standard) * 5 + sizeof(struct ipt_error),
.hook_entry = {
[NF_INET_PRE_ROUTING] = 0,
[NF_INET_LOCAL_IN] = sizeof(struct ipt_standard),
[NF_INET_FORWARD] = sizeof(struct ipt_standard) * 2,
[NF_INET_LOCAL_OUT] = sizeof(struct ipt_standard) * 3,
[NF_INET_POST_ROUTING] = sizeof(struct ipt_standard) * 4,
},
.underflow = {
[NF_INET_PRE_ROUTING] = 0,
[NF_INET_LOCAL_IN] = sizeof(struct ipt_standard),
[NF_INET_FORWARD] = sizeof(struct ipt_standard) * 2,
[NF_INET_LOCAL_OUT] = sizeof(struct ipt_standard) * 3,
[NF_INET_POST_ROUTING] = sizeof(struct ipt_standard) * 4,
},
},
.entries = {
IPT_STANDARD_INIT(NF_ACCEPT), /* PRE_ROUTING */
IPT_STANDARD_INIT(NF_ACCEPT), /* LOCAL_IN */
IPT_STANDARD_INIT(NF_ACCEPT), /* FORWARD */
IPT_STANDARD_INIT(NF_ACCEPT), /* LOCAL_OUT */
IPT_STANDARD_INIT(NF_ACCEPT), /* POST_ROUTING */
},
.term = IPT_ERROR_INIT, /* ERROR */
};
static const struct xt_table packet_mangler = {
.name = "mangle",
.valid_hooks = MANGLE_VALID_HOOKS,
@ -134,9 +97,14 @@ static struct nf_hook_ops *mangle_ops __read_mostly;
static int __net_init iptable_mangle_net_init(struct net *net)
{
/* Register table */
struct ipt_replace *repl;
repl = ipt_alloc_initial_table(&packet_mangler);
if (repl == NULL)
return -ENOMEM;
net->ipv4.iptable_mangle =
ipt_register_table(net, &packet_mangler, &initial_table.repl);
ipt_register_table(net, &packet_mangler, repl);
kfree(repl);
if (IS_ERR(net->ipv4.iptable_mangle))
return PTR_ERR(net->ipv4.iptable_mangle);
return 0;

36
net/ipv4/netfilter/iptable_raw.c
View File

@ -9,33 +9,6 @@
#define RAW_VALID_HOOKS ((1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_OUT))
static const struct
{
struct ipt_replace repl;
struct ipt_standard entries[2];
struct ipt_error term;
} initial_table __net_initdata = {
.repl = {
.name = "raw",
.valid_hooks = RAW_VALID_HOOKS,
.num_entries = 3,
.size = sizeof(struct ipt_standard) * 2 + sizeof(struct ipt_error),
.hook_entry = {
[NF_INET_PRE_ROUTING] = 0,
[NF_INET_LOCAL_OUT] = sizeof(struct ipt_standard)
},
.underflow = {
[NF_INET_PRE_ROUTING] = 0,
[NF_INET_LOCAL_OUT] = sizeof(struct ipt_standard)
},
},
.entries = {
IPT_STANDARD_INIT(NF_ACCEPT), /* PRE_ROUTING */
IPT_STANDARD_INIT(NF_ACCEPT), /* LOCAL_OUT */
},
.term = IPT_ERROR_INIT, /* ERROR */
};
static const struct xt_table packet_raw = {
.name = "raw",
.valid_hooks = RAW_VALID_HOOKS,
@ -66,9 +39,14 @@ static struct nf_hook_ops *rawtable_ops __read_mostly;
static int __net_init iptable_raw_net_init(struct net *net)
{
/* Register table */
struct ipt_replace *repl;
repl = ipt_alloc_initial_table(&packet_raw);
if (repl == NULL)
return -ENOMEM;
net->ipv4.iptable_raw =
ipt_register_table(net, &packet_raw, &initial_table.repl);
ipt_register_table(net, &packet_raw, repl);
kfree(repl);
if (IS_ERR(net->ipv4.iptable_raw))
return PTR_ERR(net->ipv4.iptable_raw);
return 0;

39
net/ipv4/netfilter/iptable_security.c
View File

@ -27,36 +27,6 @@ MODULE_DESCRIPTION("iptables security table, for MAC rules");
(1 << NF_INET_FORWARD) | \
(1 << NF_INET_LOCAL_OUT)
static const struct
{
struct ipt_replace repl;
struct ipt_standard entries[3];
struct ipt_error term;
} initial_table __net_initdata = {
.repl = {
.name = "security",
.valid_hooks = SECURITY_VALID_HOOKS,
.num_entries = 4,
.size = sizeof(struct ipt_standard) * 3 + sizeof(struct ipt_error),
.hook_entry = {
[NF_INET_LOCAL_IN] = 0,
[NF_INET_FORWARD] = sizeof(struct ipt_standard),
[NF_INET_LOCAL_OUT] = sizeof(struct ipt_standard) * 2,
},
.underflow = {
[NF_INET_LOCAL_IN] = 0,
[NF_INET_FORWARD] = sizeof(struct ipt_standard),
[NF_INET_LOCAL_OUT] = sizeof(struct ipt_standard) * 2,
},
},
.entries = {
IPT_STANDARD_INIT(NF_ACCEPT), /* LOCAL_IN */
IPT_STANDARD_INIT(NF_ACCEPT), /* FORWARD */
IPT_STANDARD_INIT(NF_ACCEPT), /* LOCAL_OUT */
},
.term = IPT_ERROR_INIT, /* ERROR */
};
static const struct xt_table security_table = {
.name = "security",
.valid_hooks = SECURITY_VALID_HOOKS,
@ -87,9 +57,14 @@ static struct nf_hook_ops *sectbl_ops __read_mostly;
static int __net_init iptable_security_net_init(struct net *net)
{
net->ipv4.iptable_security =
ipt_register_table(net, &security_table, &initial_table.repl);
struct ipt_replace *repl;
repl = ipt_alloc_initial_table(&security_table);
if (repl == NULL)
return -ENOMEM;
net->ipv4.iptable_security =
ipt_register_table(net, &security_table, repl);
kfree(repl);
if (IS_ERR(net->ipv4.iptable_security))
return PTR_ERR(net->ipv4.iptable_security);

39
net/ipv4/netfilter/nf_nat_rule.c
View File

@ -28,36 +28,6 @@
(1 << NF_INET_POST_ROUTING) | \
(1 << NF_INET_LOCAL_OUT))
static const struct
{
struct ipt_replace repl;
struct ipt_standard entries[3];
struct ipt_error term;
} nat_initial_table __net_initdata = {
.repl = {
.name = "nat",
.valid_hooks = NAT_VALID_HOOKS,
.num_entries = 4,
.size = sizeof(struct ipt_standard) * 3 + sizeof(struct ipt_error),
.hook_entry = {
[NF_INET_PRE_ROUTING] = 0,
[NF_INET_POST_ROUTING] = sizeof(struct ipt_standard),
[NF_INET_LOCAL_OUT] = sizeof(struct ipt_standard) * 2
},
.underflow = {
[NF_INET_PRE_ROUTING] = 0,
[NF_INET_POST_ROUTING] = sizeof(struct ipt_standard),
[NF_INET_LOCAL_OUT] = sizeof(struct ipt_standard) * 2
},
},
.entries = {
IPT_STANDARD_INIT(NF_ACCEPT), /* PRE_ROUTING */
IPT_STANDARD_INIT(NF_ACCEPT), /* POST_ROUTING */
IPT_STANDARD_INIT(NF_ACCEPT), /* LOCAL_OUT */
},
.term = IPT_ERROR_INIT, /* ERROR */
};
static const struct xt_table nat_table = {
.name = "nat",
.valid_hooks = NAT_VALID_HOOKS,
@ -186,8 +156,13 @@ static struct xt_target ipt_dnat_reg __read_mostly = {
static int __net_init nf_nat_rule_net_init(struct net *net)
{
net->ipv4.nat_table = ipt_register_table(net, &nat_table,
&nat_initial_table.repl);
struct ipt_replace *repl;
repl = ipt_alloc_initial_table(&nat_table);
if (repl == NULL)
return -ENOMEM;
net->ipv4.nat_table = ipt_register_table(net, &nat_table, repl);
kfree(repl);
if (IS_ERR(net->ipv4.nat_table))
return PTR_ERR(net->ipv4.nat_table);
return 0;

7
net/ipv6/netfilter/ip6_tables.c
View File

@ -29,6 +29,7 @@
#include <linux/netfilter_ipv6/ip6_tables.h>
#include <linux/netfilter/x_tables.h>
#include <net/netfilter/nf_log.h>
#include "../../netfilter/xt_repldata.h"
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
@ -67,6 +68,12 @@ do { \
#define inline
#endif
void *ip6t_alloc_initial_table(const struct xt_table *info)
{
return xt_alloc_initial_table(ip6t, IP6T);
}
EXPORT_SYMBOL_GPL(ip6t_alloc_initial_table);
/*
We keep a set of rules for each CPU, so we can avoid write-locking
them in the softirq when updating the counters and therefore

46
net/ipv6/netfilter/ip6table_filter.c
View File

@ -21,36 +21,6 @@ MODULE_DESCRIPTION("ip6tables filter table");
(1 << NF_INET_FORWARD) | \
(1 << NF_INET_LOCAL_OUT))
static struct
{
struct ip6t_replace repl;
struct ip6t_standard entries[3];
struct ip6t_error term;
} initial_table __net_initdata = {
.repl = {
.name = "filter",
.valid_hooks = FILTER_VALID_HOOKS,
.num_entries = 4,
.size = sizeof(struct ip6t_standard) * 3 + sizeof(struct ip6t_error),
.hook_entry = {
[NF_INET_LOCAL_IN] = 0,
[NF_INET_FORWARD] = sizeof(struct ip6t_standard),
[NF_INET_LOCAL_OUT] = sizeof(struct ip6t_standard) * 2
},
.underflow = {
[NF_INET_LOCAL_IN] = 0,
[NF_INET_FORWARD] = sizeof(struct ip6t_standard),
[NF_INET_LOCAL_OUT] = sizeof(struct ip6t_standard) * 2
},
},
.entries = {
IP6T_STANDARD_INIT(NF_ACCEPT), /* LOCAL_IN */
IP6T_STANDARD_INIT(NF_ACCEPT), /* FORWARD */
IP6T_STANDARD_INIT(NF_ACCEPT), /* LOCAL_OUT */
},
.term = IP6T_ERROR_INIT, /* ERROR */
};
static const struct xt_table packet_filter = {
.name = "filter",
.valid_hooks = FILTER_VALID_HOOKS,
@ -78,9 +48,18 @@ module_param(forward, bool, 0000);
static int __net_init ip6table_filter_net_init(struct net *net)
{
/* Register table */
struct ip6t_replace *repl;
repl = ip6t_alloc_initial_table(&packet_filter);
if (repl == NULL)
return -ENOMEM;
/* Entry 1 is the FORWARD hook */
((struct ip6t_standard *)repl->entries)[1].target.verdict =
-forward - 1;
net->ipv6.ip6table_filter =
ip6t_register_table(net, &packet_filter, &initial_table.repl);
ip6t_register_table(net, &packet_filter, repl);
kfree(repl);
if (IS_ERR(net->ipv6.ip6table_filter))
return PTR_ERR(net->ipv6.ip6table_filter);
return 0;
@ -105,9 +84,6 @@ static int __init ip6table_filter_init(void)
return -EINVAL;
}
/* Entry 1 is the FORWARD hook */
initial_table.entries[1].target.verdict = -forward - 1;
ret = register_pernet_subsys(&ip6table_filter_net_ops);
if (ret < 0)
return ret;

45
net/ipv6/netfilter/ip6table_mangle.c
View File

@ -21,42 +21,6 @@ MODULE_DESCRIPTION("ip6tables mangle table");
(1 << NF_INET_LOCAL_OUT) | \
(1 << NF_INET_POST_ROUTING))
static const struct
{
struct ip6t_replace repl;
struct ip6t_standard entries[5];
struct ip6t_error term;
} initial_table __net_initdata = {
.repl = {
.name = "mangle",
.valid_hooks = MANGLE_VALID_HOOKS,
.num_entries = 6,
.size = sizeof(struct ip6t_standard) * 5 + sizeof(struct ip6t_error),
.hook_entry = {
[NF_INET_PRE_ROUTING] = 0,
[NF_INET_LOCAL_IN] = sizeof(struct ip6t_standard),
[NF_INET_FORWARD] = sizeof(struct ip6t_standard) * 2,
[NF_INET_LOCAL_OUT] = sizeof(struct ip6t_standard) * 3,
[NF_INET_POST_ROUTING] = sizeof(struct ip6t_standard) * 4,
},
.underflow = {
[NF_INET_PRE_ROUTING] = 0,
[NF_INET_LOCAL_IN] = sizeof(struct ip6t_standard),
[NF_INET_FORWARD] = sizeof(struct ip6t_standard) * 2,
[NF_INET_LOCAL_OUT] = sizeof(struct ip6t_standard) * 3,
[NF_INET_POST_ROUTING] = sizeof(struct ip6t_standard) * 4,
},
},
.entries = {
IP6T_STANDARD_INIT(NF_ACCEPT), /* PRE_ROUTING */
IP6T_STANDARD_INIT(NF_ACCEPT), /* LOCAL_IN */
IP6T_STANDARD_INIT(NF_ACCEPT), /* FORWARD */
IP6T_STANDARD_INIT(NF_ACCEPT), /* LOCAL_OUT */
IP6T_STANDARD_INIT(NF_ACCEPT), /* POST_ROUTING */
},
.term = IP6T_ERROR_INIT, /* ERROR */
};
static const struct xt_table packet_mangler = {
.name = "mangle",
.valid_hooks = MANGLE_VALID_HOOKS,
@ -126,9 +90,14 @@ ip6table_mangle_hook(unsigned int hook, struct sk_buff *skb,
static struct nf_hook_ops *mangle_ops __read_mostly;
static int __net_init ip6table_mangle_net_init(struct net *net)
{
/* Register table */
struct ip6t_replace *repl;
repl = ip6t_alloc_initial_table(&packet_mangler);
if (repl == NULL)
return -ENOMEM;
net->ipv6.ip6table_mangle =
ip6t_register_table(net, &packet_mangler, &initial_table.repl);
ip6t_register_table(net, &packet_mangler, repl);
kfree(repl);
if (IS_ERR(net->ipv6.ip6table_mangle))
return PTR_ERR(net->ipv6.ip6table_mangle);
return 0;

36
net/ipv6/netfilter/ip6table_raw.c
View File

@ -8,33 +8,6 @@
#define RAW_VALID_HOOKS ((1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_OUT))
static const struct
{
struct ip6t_replace repl;
struct ip6t_standard entries[2];
struct ip6t_error term;
} initial_table __net_initdata = {
.repl = {
.name = "raw",
.valid_hooks = RAW_VALID_HOOKS,
.num_entries = 3,
.size = sizeof(struct ip6t_standard) * 2 + sizeof(struct ip6t_error),
.hook_entry = {
[NF_INET_PRE_ROUTING] = 0,
[NF_INET_LOCAL_OUT] = sizeof(struct ip6t_standard)
},
.underflow = {
[NF_INET_PRE_ROUTING] = 0,
[NF_INET_LOCAL_OUT] = sizeof(struct ip6t_standard)
},
},
.entries = {
IP6T_STANDARD_INIT(NF_ACCEPT), /* PRE_ROUTING */
IP6T_STANDARD_INIT(NF_ACCEPT), /* LOCAL_OUT */
},
.term = IP6T_ERROR_INIT, /* ERROR */
};
static const struct xt_table packet_raw = {
.name = "raw",
.valid_hooks = RAW_VALID_HOOKS,
@ -58,9 +31,14 @@ static struct nf_hook_ops *rawtable_ops __read_mostly;
static int __net_init ip6table_raw_net_init(struct net *net)
{
/* Register table */
struct ip6t_replace *repl;
repl = ip6t_alloc_initial_table(&packet_raw);
if (repl == NULL)
return -ENOMEM;
net->ipv6.ip6table_raw =
ip6t_register_table(net, &packet_raw, &initial_table.repl);
ip6t_register_table(net, &packet_raw, repl);
kfree(repl);
if (IS_ERR(net->ipv6.ip6table_raw))
return PTR_ERR(net->ipv6.ip6table_raw);
return 0;

39
net/ipv6/netfilter/ip6table_security.c
View File

@ -26,36 +26,6 @@ MODULE_DESCRIPTION("ip6tables security table, for MAC rules");
(1 << NF_INET_FORWARD) | \
(1 << NF_INET_LOCAL_OUT)
static const struct
{
struct ip6t_replace repl;
struct ip6t_standard entries[3];
struct ip6t_error term;
} initial_table __net_initdata = {
.repl = {
.name = "security",
.valid_hooks = SECURITY_VALID_HOOKS,
.num_entries = 4,
.size = sizeof(struct ip6t_standard) * 3 + sizeof(struct ip6t_error),
.hook_entry = {
[NF_INET_LOCAL_IN] = 0,
[NF_INET_FORWARD] = sizeof(struct ip6t_standard),
[NF_INET_LOCAL_OUT] = sizeof(struct ip6t_standard) * 2,
},
.underflow = {
[NF_INET_LOCAL_IN] = 0,
[NF_INET_FORWARD] = sizeof(struct ip6t_standard),
[NF_INET_LOCAL_OUT] = sizeof(struct ip6t_standard) * 2,
},
},
.entries = {
IP6T_STANDARD_INIT(NF_ACCEPT), /* LOCAL_IN */
IP6T_STANDARD_INIT(NF_ACCEPT), /* FORWARD */
IP6T_STANDARD_INIT(NF_ACCEPT), /* LOCAL_OUT */
},
.term = IP6T_ERROR_INIT, /* ERROR */
};
static const struct xt_table security_table = {
.name = "security",
.valid_hooks = SECURITY_VALID_HOOKS,
@ -79,9 +49,14 @@ static struct nf_hook_ops *sectbl_ops __read_mostly;
static int __net_init ip6table_security_net_init(struct net *net)
{
net->ipv6.ip6table_security =
ip6t_register_table(net, &security_table, &initial_table.repl);
struct ip6t_replace *repl;
repl = ip6t_alloc_initial_table(&security_table);
if (repl == NULL)
return -ENOMEM;
net->ipv6.ip6table_security =
ip6t_register_table(net, &security_table, repl);
kfree(repl);
if (IS_ERR(net->ipv6.ip6table_security))
return PTR_ERR(net->ipv6.ip6table_security);

4
net/netfilter/x_tables.c
View File

@ -26,7 +26,9 @@
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter_arp.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netfilter_ipv6/ip6_tables.h>
#include <linux/netfilter_arp/arp_tables.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");

35
net/netfilter/xt_repldata.h Normal file
View File

@ -0,0 +1,35 @@
/*
* Today's hack: quantum tunneling in structs
*
* 'entries' and 'term' are never anywhere referenced by word in code. In fact,
* they serve as the hanging-off data accessed through repl.data[].
*/
#define xt_alloc_initial_table(type, typ2) ({ \
unsigned int hook_mask = info->valid_hooks; \
unsigned int nhooks = hweight32(hook_mask); \
unsigned int bytes = 0, hooknum = 0, i = 0; \
struct { \
struct type##_replace repl; \
struct type##_standard entries[nhooks]; \
struct type##_error term; \
} *tbl = kzalloc(sizeof(*tbl), GFP_KERNEL); \
if (tbl == NULL) \
return NULL; \
strncpy(tbl->repl.name, info->name, sizeof(tbl->repl.name)); \
tbl->term = (struct type##_error)typ2##_ERROR_INIT; \
tbl->repl.valid_hooks = hook_mask; \
tbl->repl.num_entries = nhooks + 1; \
tbl->repl.size = nhooks * sizeof(struct type##_standard) + \
sizeof(struct type##_error); \
for (; hook_mask != 0; hook_mask >>= 1, ++hooknum) { \
if (!(hook_mask & 1)) \
continue; \
tbl->repl.hook_entry[hooknum] = bytes; \
tbl->repl.underflow[hooknum] = bytes; \
tbl->entries[i++] = (struct type##_standard) \
typ2##_STANDARD_INIT(NF_ACCEPT); \
bytes += sizeof(struct type##_standard); \
} \
tbl; \
})