[NETFILTER]: Add goto target

Originally written by Henrik Nordstrom <hno@marasystems.com>, taken
from netfilter patch-o-matic and added ip6_tables support.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 8 insertions, 6 deletions

diff --git a/include/linux/netfilter_ipv4/ip_tables.h b/include/linux/netfilter_ipv4/ip_tables.h
index 12ce47808e7d..d19d65cf4530 100644
--- a/include/linux/netfilter_ipv4/ip_tables.h
+++ b/include/linux/netfilter_ipv4/ip_tables.h
@@ -109,7 +109,8 @@ struct ipt_counters
 
 /* Values for "flag" field in struct ipt_ip (general ip structure). */
 #define IPT_F_FRAG              0x01    /* Set if rule is a fragment rule */
-#define IPT_F_MASK              0x01    /* All possible flag bits mask. */
+#define IPT_F_GOTO              0x02    /* Set if jump is a goto */
+#define IPT_F_MASK              0x03    /* All possible flag bits mask. */
 
 /* Values for "inv" field in struct ipt_ip. */
 #define IPT_INV_VIA_IN          0x01    /* Invert the sense of IN IFACE. */
diff --git a/include/linux/netfilter_ipv6/ip6_tables.h b/include/linux/netfilter_ipv6/ip6_tables.h
index f1ce3b009853..58c72a52dc65 100644
--- a/include/linux/netfilter_ipv6/ip6_tables.h
+++ b/include/linux/netfilter_ipv6/ip6_tables.h
@@ -111,7 +111,8 @@ struct ip6t_counters
 #define IP6T_F_PROTO            0x01    /* Set if rule cares about upper 
                                            protocols */
 #define IP6T_F_TOS              0x02    /* Match the TOS. */
-#define IP6T_F_MASK             0x03    /* All possible flag bits mask. */
+#define IP6T_F_GOTO             0x04    /* Set if jump is a goto */
+#define IP6T_F_MASK             0x07    /* All possible flag bits mask. */
 
 /* Values for "inv" field in struct ip6t_ip6. */
 #define IP6T_INV_VIA_IN         0x01    /* Invert the sense of IN IFACE. */
diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
index ff8d85d2070d..eef99a1b5de6 100644
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -340,8 +340,8 @@ ipt_do_table(struct sk_buff **pskb,
                                                          back->comefrom);
                                         continue;
                                 }
-                                if (table_base + v
-                                    != (void *)e + e->next_offset) {
+                                if (table_base + v != (void *)e + e->next_offset
+                                    && !(e->ip.flags & IPT_F_GOTO)) {
                                         /* Save old back ptr in next entry */
                                         struct ipt_entry *next
                                                 = (void *)e + e->next_offset;
diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c
index 41a67cf6e33a..1cb8adb2787f 100644
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -433,8 +433,8 @@ ip6t_do_table(struct sk_buff **pskb,
                                                          back->comefrom);
                                         continue;
                                 }
-                                if (table_base + v
-                                    != (void *)e + e->next_offset) {
+                                if (table_base + v != (void *)e + e->next_offset
+                                    && !(e->ipv6.flags & IP6T_F_GOTO)) {
                                         /* Save old back ptr in next entry */
                                         struct ip6t_entry *next
                                                 = (void *)e + e->next_offset;