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openwrt/openwrt/target/linux/generic-2.4/patches/611-netfilter_condition.patch

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diff -ruN linux-2.4.30-old/Documentation/Configure.help linux-2.4.30-new/Documentation/Configure.help
--- linux-2.4.30-old/Documentation/Configure.help 2005-11-13 21:52:27.000000000 +0100
+++ linux-2.4.30-new/Documentation/Configure.help 2005-11-13 22:20:15.000000000 +0100
@@ -2979,6 +2979,14 @@
If you want to compile it as a module, say M here and read
<file:Documentation/modules.txt>. If unsure, say `N'.
+Condition variable match support
+CONFIG_IP_NF_MATCH_CONDITION
+ This option allows you to match firewall rules against condition
+ variables stored in the /proc/net/ipt_condition directory.
+
+ If you want to compile it as a module, say M here and read
+ Documentation/modules.txt. If unsure, say `N'.
+
conntrack match support
CONFIG_IP_NF_MATCH_CONNTRACK
This is a general conntrack match module, a superset of the state match.
@@ -3354,6 +3362,14 @@
If you want to compile it as a module, say M here and read
<file:Documentation/modules.txt>. If unsure, say `N'.
+Condition variable match support
+CONFIG_IP6_NF_MATCH_CONDITION
+ This option allows you to match firewall rules against condition
+ variables stored in the /proc/net/ipt_condition directory.
+
+ If you want to compile it as a module, say M here and read
+ Documentation/modules.txt. If unsure, say `N'.
+
Multiple port match support
CONFIG_IP6_NF_MATCH_MULTIPORT
Multiport matching allows you to match TCP or UDP packets based on
diff -ruN linux-2.4.30-old/include/linux/netfilter_ipv4/ipt_condition.h linux-2.4.30-new/include/linux/netfilter_ipv4/ipt_condition.h
--- linux-2.4.30-old/include/linux/netfilter_ipv4/ipt_condition.h 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.4.30-new/include/linux/netfilter_ipv4/ipt_condition.h 2005-11-13 22:20:14.000000000 +0100
@@ -0,0 +1,11 @@
+#ifndef __IPT_CONDITION_MATCH__
+#define __IPT_CONDITION_MATCH__
+
+#define CONDITION_NAME_LEN 32
+
+struct condition_info {
+ char name[CONDITION_NAME_LEN];
+ int invert;
+};
+
+#endif
diff -ruN linux-2.4.30-old/include/linux/netfilter_ipv6/ip6t_condition.h linux-2.4.30-new/include/linux/netfilter_ipv6/ip6t_condition.h
--- linux-2.4.30-old/include/linux/netfilter_ipv6/ip6t_condition.h 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.4.30-new/include/linux/netfilter_ipv6/ip6t_condition.h 2005-11-13 22:20:14.000000000 +0100
@@ -0,0 +1,11 @@
+#ifndef __IP6T_CONDITION_MATCH__
+#define __IP6T_CONDITION_MATCH__
+
+#define CONDITION6_NAME_LEN 32
+
+struct condition6_info {
+ char name[CONDITION6_NAME_LEN];
+ int invert;
+};
+
+#endif
diff -ruN linux-2.4.30-old/net/ipv4/netfilter/Config.in linux-2.4.30-new/net/ipv4/netfilter/Config.in
--- linux-2.4.30-old/net/ipv4/netfilter/Config.in 2005-11-13 21:52:27.000000000 +0100
+++ linux-2.4.30-new/net/ipv4/netfilter/Config.in 2005-11-13 22:20:15.000000000 +0100
@@ -43,6 +43,7 @@
dep_tristate ' netfilter MARK match support' CONFIG_IP_NF_MATCH_MARK $CONFIG_IP_NF_IPTABLES
dep_tristate ' Multiple port match support' CONFIG_IP_NF_MATCH_MULTIPORT $CONFIG_IP_NF_IPTABLES
dep_tristate ' TOS match support' CONFIG_IP_NF_MATCH_TOS $CONFIG_IP_NF_IPTABLES
+ dep_tristate ' condition match support' CONFIG_IP_NF_MATCH_CONDITION $CONFIG_IP_NF_IPTABLES
dep_tristate ' recent match support' CONFIG_IP_NF_MATCH_RECENT $CONFIG_IP_NF_IPTABLES
dep_tristate ' ECN match support' CONFIG_IP_NF_MATCH_ECN $CONFIG_IP_NF_IPTABLES
dep_tristate ' peer to peer traffic match support' CONFIG_IP_NF_MATCH_IPP2P $CONFIG_IP_NF_IPTABLES
diff -ruN linux-2.4.30-old/net/ipv4/netfilter/Makefile linux-2.4.30-new/net/ipv4/netfilter/Makefile
--- linux-2.4.30-old/net/ipv4/netfilter/Makefile 2005-11-13 21:52:27.000000000 +0100
+++ linux-2.4.30-new/net/ipv4/netfilter/Makefile 2005-11-13 22:20:15.000000000 +0100
@@ -94,6 +94,7 @@
obj-$(CONFIG_IP_NF_MATCH_MULTIPORT) += ipt_multiport.o
obj-$(CONFIG_IP_NF_MATCH_OWNER) += ipt_owner.o
obj-$(CONFIG_IP_NF_MATCH_TOS) += ipt_tos.o
+obj-$(CONFIG_IP_NF_MATCH_CONDITION) += ipt_condition.o
obj-$(CONFIG_IP_NF_MATCH_RECENT) += ipt_recent.o
diff -ruN linux-2.4.30-old/net/ipv4/netfilter/ipt_condition.c linux-2.4.30-new/net/ipv4/netfilter/ipt_condition.c
--- linux-2.4.30-old/net/ipv4/netfilter/ipt_condition.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.4.30-new/net/ipv4/netfilter/ipt_condition.c 2005-11-13 22:20:14.000000000 +0100
@@ -0,0 +1,256 @@
+/*-------------------------------------------*\
+| Netfilter Condition Module |
+| |
+| Description: This module allows firewall |
+| rules to match using condition variables |
+| stored in /proc files. |
+| |
+| Author: Stephane Ouellette 2002-10-22 |
+| <ouellettes@videotron.ca> |
+| |
+| History: |
+| 2003-02-10 Second version with improved |
+| locking and simplified code. |
+| |
+| This software is distributed under the |
+| terms of the GNU GPL. |
+\*-------------------------------------------*/
+
+#include<linux/module.h>
+#include<linux/proc_fs.h>
+#include<linux/spinlock.h>
+#include<linux/string.h>
+#include<asm/atomic.h>
+#include<linux/netfilter_ipv4/ip_tables.h>
+#include<linux/netfilter_ipv4/ipt_condition.h>
+
+
+#ifndef CONFIG_PROC_FS
+#error "Proc file system support is required for this module"
+#endif
+
+
+MODULE_AUTHOR("Stephane Ouellette <ouellettes@videotron.ca>");
+MODULE_DESCRIPTION("Allows rules to match against condition variables");
+MODULE_LICENSE("GPL");
+
+
+struct condition_variable {
+ struct condition_variable *next;
+ struct proc_dir_entry *status_proc;
+ atomic_t refcount;
+ int enabled; /* TRUE == 1, FALSE == 0 */
+};
+
+
+static rwlock_t list_lock;
+static struct condition_variable *head = NULL;
+static struct proc_dir_entry *proc_net_condition = NULL;
+
+
+static int
+ipt_condition_read_info(char *buffer, char **start, off_t offset,
+ int length, int *eof, void *data)
+{
+ struct condition_variable *var =
+ (struct condition_variable *) data;
+
+ if (offset == 0) {
+ *start = buffer;
+ buffer[0] = (var->enabled) ? '1' : '0';
+ buffer[1] = '\n';
+ return 2;
+ }
+
+ *eof = 1;
+ return 0;
+}
+
+
+static int
+ipt_condition_write_info(struct file *file, const char *buffer,
+ unsigned long length, void *data)
+{
+ struct condition_variable *var =
+ (struct condition_variable *) data;
+
+ if (length) {
+ /* Match only on the first character */
+ switch (buffer[0]) {
+ case '0':
+ var->enabled = 0;
+ break;
+ case '1':
+ var->enabled = 1;
+ }
+ }
+
+ return (int) length;
+}
+
+
+static int
+match(const struct sk_buff *skb, const struct net_device *in,
+ const struct net_device *out, const void *matchinfo, int offset,
+ const void *hdr, u_int16_t datalen, int *hotdrop)
+{
+ const struct condition_info *info =
+ (const struct condition_info *) matchinfo;
+ struct condition_variable *var;
+ int condition_status = 0;
+
+ read_lock(&list_lock);
+
+ for (var = head; var; var = var->next) {
+ if (strcmp(info->name, var->status_proc->name) == 0) {
+ condition_status = var->enabled;
+ break;
+ }
+ }
+
+ read_unlock(&list_lock);
+
+ return condition_status ^ info->invert;
+}
+
+
+
+static int
+checkentry(const char *tablename, const struct ipt_ip *ip,
+ void *matchinfo, unsigned int matchsize, unsigned int hook_mask)
+{
+ struct condition_info *info = (struct condition_info *) matchinfo;
+ struct condition_variable *var, *newvar;
+
+ if (matchsize != IPT_ALIGN(sizeof(struct condition_info)))
+ return 0;
+
+ /* The first step is to check if the condition variable already exists. */
+ /* Here, a read lock is sufficient because we won't change the list */
+ read_lock(&list_lock);
+
+ for (var = head; var; var = var->next) {
+ if (strcmp(info->name, var->status_proc->name) == 0) {
+ atomic_inc(&var->refcount);
+ read_unlock(&list_lock);
+ return 1;
+ }
+ }
+
+ read_unlock(&list_lock);
+
+ /* At this point, we need to allocate a new condition variable */
+ newvar = kmalloc(sizeof(struct condition_variable), GFP_KERNEL);
+
+ if (!newvar)
+ return -ENOMEM;
+
+ /* Create the condition variable's proc file entry */
+ newvar->status_proc = create_proc_entry(info->name, 0644, proc_net_condition);
+
+ if (!newvar->status_proc) {
+ /*
+ * There are two possibilities:
+ * 1- Another condition variable with the same name has been created, which is valid.
+ * 2- There was a memory allocation error.
+ */
+ kfree(newvar);
+ read_lock(&list_lock);
+
+ for (var = head; var; var = var->next) {
+ if (strcmp(info->name, var->status_proc->name) == 0) {
+ atomic_inc(&var->refcount);
+ read_unlock(&list_lock);
+ return 1;
+ }
+ }
+
+ read_unlock(&list_lock);
+ return -ENOMEM;
+ }
+
+ atomic_set(&newvar->refcount, 1);
+ newvar->enabled = 0;
+ newvar->status_proc->owner = THIS_MODULE;
+ newvar->status_proc->data = newvar;
+ wmb();
+ newvar->status_proc->read_proc = ipt_condition_read_info;
+ newvar->status_proc->write_proc = ipt_condition_write_info;
+
+ write_lock(&list_lock);
+
+ newvar->next = head;
+ head = newvar;
+
+ write_unlock(&list_lock);
+
+ return 1;
+}
+
+
+static void
+destroy(void *matchinfo, unsigned int matchsize)
+{
+ struct condition_info *info = (struct condition_info *) matchinfo;
+ struct condition_variable *var, *prev = NULL;
+
+ if (matchsize != IPT_ALIGN(sizeof(struct condition_info)))
+ return;
+
+ write_lock(&list_lock);
+
+ for (var = head; var && strcmp(info->name, var->status_proc->name);
+ prev = var, var = var->next);
+
+ if (var && atomic_dec_and_test(&var->refcount)) {
+ if (prev)
+ prev->next = var->next;
+ else
+ head = var->next;
+
+ write_unlock(&list_lock);
+ remove_proc_entry(var->status_proc->name, proc_net_condition);
+ kfree(var);
+ } else
+ write_unlock(&list_lock);
+}
+
+
+static struct ipt_match condition_match = {
+ .name = "condition",
+ .match = &match,
+ .checkentry = &checkentry,
+ .destroy = &destroy,
+ .me = THIS_MODULE
+};
+
+
+static int __init
+init(void)
+{
+ int errorcode;
+
+ rwlock_init(&list_lock);
+ proc_net_condition = proc_mkdir("ipt_condition", proc_net);
+
+ if (proc_net_condition) {
+ errorcode = ipt_register_match(&condition_match);
+
+ if (errorcode)
+ remove_proc_entry("ipt_condition", proc_net);
+ } else
+ errorcode = -EACCES;
+
+ return errorcode;
+}
+
+
+static void __exit
+fini(void)
+{
+ ipt_unregister_match(&condition_match);
+ remove_proc_entry("ipt_condition", proc_net);
+}
+
+module_init(init);
+module_exit(fini);
diff -ruN linux-2.4.30-old/net/ipv6/netfilter/Config.in linux-2.4.30-new/net/ipv6/netfilter/Config.in
--- linux-2.4.30-old/net/ipv6/netfilter/Config.in 2003-06-13 16:51:39.000000000 +0200
+++ linux-2.4.30-new/net/ipv6/netfilter/Config.in 2005-11-13 22:20:15.000000000 +0100
@@ -17,6 +17,7 @@
if [ "$CONFIG_IP6_NF_IPTABLES" != "n" ]; then
# The simple matches.
dep_tristate ' limit match support' CONFIG_IP6_NF_MATCH_LIMIT $CONFIG_IP6_NF_IPTABLES
+ dep_tristate ' condition match support' CONFIG_IP6_NF_MATCH_CONDITION $CONFIG_IP6_NF_IPTABLES
dep_tristate ' MAC address match support' CONFIG_IP6_NF_MATCH_MAC $CONFIG_IP6_NF_IPTABLES
if [ "$CONFIG_EXPERIMENTAL" = "y" ]; then
dep_tristate ' Routing header match support (EXPERIMENTAL)' CONFIG_IP6_NF_MATCH_RT $CONFIG_IP6_NF_IPTABLES
diff -ruN linux-2.4.30-old/net/ipv6/netfilter/Makefile linux-2.4.30-new/net/ipv6/netfilter/Makefile
--- linux-2.4.30-old/net/ipv6/netfilter/Makefile 2003-06-13 16:51:39.000000000 +0200
+++ linux-2.4.30-new/net/ipv6/netfilter/Makefile 2005-11-13 22:20:15.000000000 +0100
@@ -14,6 +14,7 @@
# Link order matters here.
obj-$(CONFIG_IP6_NF_IPTABLES) += ip6_tables.o
obj-$(CONFIG_IP6_NF_MATCH_LIMIT) += ip6t_limit.o
+obj-$(CONFIG_IP6_NF_MATCH_CONDITION) += ip6t_condition.o
obj-$(CONFIG_IP6_NF_MATCH_MARK) += ip6t_mark.o
obj-$(CONFIG_IP6_NF_MATCH_LENGTH) += ip6t_length.o
obj-$(CONFIG_IP6_NF_MATCH_MAC) += ip6t_mac.o
diff -ruN linux-2.4.30-old/net/ipv6/netfilter/ip6t_condition.c linux-2.4.30-new/net/ipv6/netfilter/ip6t_condition.c
--- linux-2.4.30-old/net/ipv6/netfilter/ip6t_condition.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.4.30-new/net/ipv6/netfilter/ip6t_condition.c 2005-11-13 22:20:14.000000000 +0100
@@ -0,0 +1,254 @@
+/*-------------------------------------------*\
+| Netfilter Condition Module for IPv6 |
+| |
+| Description: This module allows firewall |
+| rules to match using condition variables |
+| stored in /proc files. |
+| |
+| Author: Stephane Ouellette 2003-02-10 |
+| <ouellettes@videotron.ca> |
+| |
+| This software is distributed under the |
+| terms of the GNU GPL. |
+\*-------------------------------------------*/
+
+#include<linux/module.h>
+#include<linux/proc_fs.h>
+#include<linux/spinlock.h>
+#include<linux/string.h>
+#include<asm/atomic.h>
+#include<linux/netfilter_ipv6/ip6_tables.h>
+#include<linux/netfilter_ipv6/ip6t_condition.h>
+
+
+#ifndef CONFIG_PROC_FS
+#error "Proc file system support is required for this module"
+#endif
+
+
+MODULE_AUTHOR("Stephane Ouellette <ouellettes@videotron.ca>");
+MODULE_DESCRIPTION("Allows rules to match against condition variables");
+MODULE_LICENSE("GPL");
+
+
+struct condition_variable {
+ struct condition_variable *next;
+ struct proc_dir_entry *status_proc;
+ atomic_t refcount;
+ int enabled; /* TRUE == 1, FALSE == 0 */
+};
+
+
+static rwlock_t list_lock;
+static struct condition_variable *head = NULL;
+static struct proc_dir_entry *proc_net_condition = NULL;
+
+
+static int
+ipt_condition_read_info(char *buffer, char **start, off_t offset,
+ int length, int *eof, void *data)
+{
+ struct condition_variable *var =
+ (struct condition_variable *) data;
+
+ if (offset == 0) {
+ *start = buffer;
+ buffer[0] = (var->enabled) ? '1' : '0';
+ buffer[1] = '\n';
+ return 2;
+ }
+
+ *eof = 1;
+ return 0;
+}
+
+
+static int
+ipt_condition_write_info(struct file *file, const char *buffer,
+ unsigned long length, void *data)
+{
+ struct condition_variable *var =
+ (struct condition_variable *) data;
+
+ if (length) {
+ /* Match only on the first character */
+ switch (buffer[0]) {
+ case '0':
+ var->enabled = 0;
+ break;
+ case '1':
+ var->enabled = 1;
+ }
+ }
+
+ return (int) length;
+}
+
+
+static int
+match(const struct sk_buff *skb, const struct net_device *in,
+ const struct net_device *out, const void *matchinfo, int offset,
+ const void *hdr, u_int16_t datalen, int *hotdrop)
+{
+ const struct condition6_info *info =
+ (const struct condition6_info *) matchinfo;
+ struct condition_variable *var;
+ int condition_status = 0;
+
+ read_lock(&list_lock);
+
+ for (var = head; var; var = var->next) {
+ if (strcmp(info->name, var->status_proc->name) == 0) {
+ condition_status = var->enabled;
+ break;
+ }
+ }
+
+ read_unlock(&list_lock);
+
+ return condition_status ^ info->invert;
+}
+
+
+
+static int
+checkentry(const char *tablename, const struct ip6t_ip6 *ip,
+ void *matchinfo, unsigned int matchsize, unsigned int hook_mask)
+{
+ struct condition6_info *info =
+ (struct condition6_info *) matchinfo;
+ struct condition_variable *var, *newvar;
+
+ if (matchsize != IP6T_ALIGN(sizeof(struct condition6_info)))
+ return 0;
+
+ /* The first step is to check if the condition variable already exists. */
+ /* Here, a read lock is sufficient because we won't change the list */
+ read_lock(&list_lock);
+
+ for (var = head; var; var = var->next) {
+ if (strcmp(info->name, var->status_proc->name) == 0) {
+ atomic_inc(&var->refcount);
+ read_unlock(&list_lock);
+ return 1;
+ }
+ }
+
+ read_unlock(&list_lock);
+
+ /* At this point, we need to allocate a new condition variable */
+ newvar = kmalloc(sizeof(struct condition_variable), GFP_KERNEL);
+
+ if (!newvar)
+ return -ENOMEM;
+
+ /* Create the condition variable's proc file entry */
+ newvar->status_proc = create_proc_entry(info->name, 0644, proc_net_condition);
+
+ if (!newvar->status_proc) {
+ /*
+ * There are two possibilities:
+ * 1- Another condition variable with the same name has been created, which is valid.
+ * 2- There was a memory allocation error.
+ */
+ kfree(newvar);
+ read_lock(&list_lock);
+
+ for (var = head; var; var = var->next) {
+ if (strcmp(info->name, var->status_proc->name) == 0) {
+ atomic_inc(&var->refcount);
+ read_unlock(&list_lock);
+ return 1;
+ }
+ }
+
+ read_unlock(&list_lock);
+ return -ENOMEM;
+ }
+
+ atomic_set(&newvar->refcount, 1);
+ newvar->enabled = 0;
+ newvar->status_proc->owner = THIS_MODULE;
+ newvar->status_proc->data = newvar;
+ wmb();
+ newvar->status_proc->read_proc = ipt_condition_read_info;
+ newvar->status_proc->write_proc = ipt_condition_write_info;
+
+ write_lock(&list_lock);
+
+ newvar->next = head;
+ head = newvar;
+
+ write_unlock(&list_lock);
+
+ return 1;
+}
+
+
+static void
+destroy(void *matchinfo, unsigned int matchsize)
+{
+ struct condition6_info *info =
+ (struct condition6_info *) matchinfo;
+ struct condition_variable *var, *prev = NULL;
+
+ if (matchsize != IP6T_ALIGN(sizeof(struct condition6_info)))
+ return;
+
+ write_lock(&list_lock);
+
+ for (var = head; var && strcmp(info->name, var->status_proc->name);
+ prev = var, var = var->next);
+
+ if (var && atomic_dec_and_test(&var->refcount)) {
+ if (prev)
+ prev->next = var->next;
+ else
+ head = var->next;
+
+ write_unlock(&list_lock);
+ remove_proc_entry(var->status_proc->name, proc_net_condition);
+ kfree(var);
+ } else
+ write_unlock(&list_lock);
+}
+
+
+static struct ip6t_match condition_match = {
+ .name = "condition",
+ .match = &match,
+ .checkentry = &checkentry,
+ .destroy = &destroy,
+ .me = THIS_MODULE
+};
+
+
+static int __init
+init(void)
+{
+ int errorcode;
+
+ rwlock_init(&list_lock);
+ proc_net_condition = proc_mkdir("ip6t_condition", proc_net);
+
+ if (proc_net_condition) {
+ errorcode = ipt_register_match(&condition_match);
+
+ if (errorcode)
+ remove_proc_entry("ip6t_condition", proc_net);
+ } else
+ errorcode = -EACCES;
+
+ return errorcode;
+}
+
+
+static void __exit
+fini(void)
+{
+ ipt_unregister_match(&condition_match);
+ remove_proc_entry("ip6t_condition", proc_net);
+}
+
+module_init(init);
+module_exit(fini);
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