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authorJan Engelhardt <jengelh@medozas.de>2009-06-17 22:14:54 +0200
committerJan Engelhardt <jengelh@medozas.de>2010-02-10 17:50:47 +0100
commite3eaa9910b380530cfd2c0670fcd3f627674da8a (patch)
tree309e522e78f78149ec3cb99ffc386d1b72415a96 /net/ipv6
parentnetfilter: xtables: use xt_table for hook instantiation (diff)
downloadlinux-dev-e3eaa9910b380530cfd2c0670fcd3f627674da8a.tar.xz
linux-dev-e3eaa9910b380530cfd2c0670fcd3f627674da8a.zip
netfilter: xtables: generate initial table on-demand
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>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/netfilter/ip6_tables.c7
-rw-r--r--net/ipv6/netfilter/ip6table_filter.c46
-rw-r--r--net/ipv6/netfilter/ip6table_mangle.c45
-rw-r--r--net/ipv6/netfilter/ip6table_raw.c36
-rw-r--r--net/ipv6/netfilter/ip6table_security.c39
5 files changed, 39 insertions, 134 deletions
diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c
index 4332f4591482..dcd7825fe7b6 100644
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -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
diff --git a/net/ipv6/netfilter/ip6table_filter.c b/net/ipv6/netfilter/ip6table_filter.c
index 6e95d0614ca9..36b72cafc227 100644
--- a/net/ipv6/netfilter/ip6table_filter.c
+++ b/net/ipv6/netfilter/ip6table_filter.c
@@ -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;
diff --git a/net/ipv6/netfilter/ip6table_mangle.c b/net/ipv6/netfilter/ip6table_mangle.c
index 5023ac52ffec..dc803b7e8e54 100644
--- a/net/ipv6/netfilter/ip6table_mangle.c
+++ b/net/ipv6/netfilter/ip6table_mangle.c
@@ -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;
diff --git a/net/ipv6/netfilter/ip6table_raw.c b/net/ipv6/netfilter/ip6table_raw.c
index 3bfa69511641..aef31a29de9e 100644
--- a/net/ipv6/netfilter/ip6table_raw.c
+++ b/net/ipv6/netfilter/ip6table_raw.c
@@ -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;
diff --git a/net/ipv6/netfilter/ip6table_security.c b/net/ipv6/netfilter/ip6table_security.c
index dd2200f17a6c..0824d865aa9b 100644
--- a/net/ipv6/netfilter/ip6table_security.c
+++ b/net/ipv6/netfilter/ip6table_security.c
@@ -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);