[NETFILTER]: Add "revision" support to arp_tables and ip6_tables

Like ip_tables already has it for some time, this adds support for
having multiple revisions for each match/target.  We steal one byte from
the name in order to accomodate a 8 bit version number.

Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>

2 files changed, 39 insertions, 8 deletions

diff --git a/include/linux/netfilter_arp/arp_tables.h b/include/linux/netfilter_arp/arp_tables.h
index d759a637bded..e98a870a20be 100644
--- a/include/linux/netfilter_arp/arp_tables.h
+++ b/include/linux/netfilter_arp/arp_tables.h
@@ -68,7 +68,8 @@ struct arpt_entry_target
                         u_int16_t target_size;
 
                         /* Used by userspace */
-                        char name[ARPT_FUNCTION_MAXNAMELEN];
+                        char name[ARPT_FUNCTION_MAXNAMELEN-1];
+                        u_int8_t revision;
                 } user;
                 struct {
                         u_int16_t target_size;
@@ -148,7 +149,9 @@ struct arpt_entry
 
 #define ARPT_SO_GET_INFO                (ARPT_BASE_CTL)
 #define ARPT_SO_GET_ENTRIES             (ARPT_BASE_CTL + 1)
-#define ARPT_SO_GET_MAX                 ARPT_SO_GET_ENTRIES
+/* #define ARPT_SO_GET_REVISION_MATCH   (ARPT_BASE_CTL + 2)*/
+#define ARPT_SO_GET_REVISION_TARGET     (ARPT_BASE_CTL + 3)
+#define ARPT_SO_GET_MAX                 ARPT_SO_GET_REVISION_TARGET
 
 /* CONTINUE verdict for targets */
 #define ARPT_CONTINUE 0xFFFFFFFF
@@ -236,6 +239,15 @@ struct arpt_get_entries
         struct arpt_entry entrytable[0];
 };
 
+/* The argument to ARPT_SO_GET_REVISION_*.  Returns highest revision
+ * kernel supports, if >= revision. */
+struct arpt_get_revision
+{
+        char name[ARPT_FUNCTION_MAXNAMELEN-1];
+
+        u_int8_t revision;
+};
+
 /* Standard return verdict, or do jump. */
 #define ARPT_STANDARD_TARGET ""
 /* Error verdict. */
@@ -274,7 +286,9 @@ struct arpt_target
 {
         struct list_head list;
 
-        const char name[ARPT_FUNCTION_MAXNAMELEN];
+        const char name[ARPT_FUNCTION_MAXNAMELEN-1];
+
+        u_int8_t revision;
 
         /* Returns verdict. */
         unsigned int (*target)(struct sk_buff **pskb,
diff --git a/include/linux/netfilter_ipv6/ip6_tables.h b/include/linux/netfilter_ipv6/ip6_tables.h
index 59f70b34e029..2efc046d9e94 100644
--- a/include/linux/netfilter_ipv6/ip6_tables.h
+++ b/include/linux/netfilter_ipv6/ip6_tables.h
@@ -57,7 +57,8 @@ struct ip6t_entry_match
                         u_int16_t match_size;
 
                         /* Used by userspace */
-                        char name[IP6T_FUNCTION_MAXNAMELEN];
+                        char name[IP6T_FUNCTION_MAXNAMELEN-1];
+                        u_int8_t revision;
                 } user;
                 struct {
                         u_int16_t match_size;
@@ -80,7 +81,8 @@ struct ip6t_entry_target
                         u_int16_t target_size;
 
                         /* Used by userspace */
-                        char name[IP6T_FUNCTION_MAXNAMELEN];
+                        char name[IP6T_FUNCTION_MAXNAMELEN-1];
+                        u_int8_t revision;
                 } user;
                 struct {
                         u_int16_t target_size;
@@ -161,7 +163,9 @@ struct ip6t_entry
 
 #define IP6T_SO_GET_INFO                (IP6T_BASE_CTL)
 #define IP6T_SO_GET_ENTRIES             (IP6T_BASE_CTL + 1)
-#define IP6T_SO_GET_MAX                 IP6T_SO_GET_ENTRIES
+#define IP6T_SO_GET_REVISION_MATCH      (IP6T_BASE_CTL + 2)
+#define IP6T_SO_GET_REVISION_TARGET     (IP6T_BASE_CTL + 3)
+#define IP6T_SO_GET_MAX                 IP6T_SO_GET_REVISION_TARGET
 
 /* CONTINUE verdict for targets */
 #define IP6T_CONTINUE 0xFFFFFFFF
@@ -291,6 +295,15 @@ struct ip6t_get_entries
         struct ip6t_entry entrytable[0];
 };
 
+/* The argument to IP6T_SO_GET_REVISION_*.  Returns highest revision
+ * kernel supports, if >= revision. */
+struct ip6t_get_revision
+{
+        char name[IP6T_FUNCTION_MAXNAMELEN-1];
+
+        u_int8_t revision;
+};
+
 /* Standard return verdict, or do jump. */
 #define IP6T_STANDARD_TARGET ""
 /* Error verdict. */
@@ -352,7 +365,9 @@ struct ip6t_match
 {
         struct list_head list;
 
-        const char name[IP6T_FUNCTION_MAXNAMELEN];
+        const char name[IP6T_FUNCTION_MAXNAMELEN-1];
+
+        u_int8_t revision;
 
         /* Return true or false: return FALSE and set *hotdrop = 1 to
            force immediate packet drop. */
@@ -387,7 +402,9 @@ struct ip6t_target
 {
         struct list_head list;
 
-        const char name[IP6T_FUNCTION_MAXNAMELEN];
+        const char name[IP6T_FUNCTION_MAXNAMELEN-1];
+
+        u_int8_t revision;
 
         /* Returns verdict. Argument order changed since 2.6.9, as this
            must now handle non-linear skbs, using skb_copy_bits and