[NETFILTER]: x_tables: add RATEEST target

Add new rate estimator target (using gen_estimator). In combination with
the rateest match (next patch) this can be used for load-based multipath
routing.

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

3 files changed, 29 insertions, 0 deletions

diff --git a/include/linux/netfilter/Kbuild b/include/linux/netfilter/Kbuild
index 1e6900278318..707a15854430 100644
--- a/include/linux/netfilter/Kbuild
+++ b/include/linux/netfilter/Kbuild
@@ -10,6 +10,7 @@ header-y += xt_DSCP.h
 header-y += xt_MARK.h
 header-y += xt_NFLOG.h
 header-y += xt_NFQUEUE.h
+header-y += xt_RATEEST.h
 header-y += xt_SECMARK.h
 header-y += xt_TCPMSS.h
 header-y += xt_comment.h
diff --git a/include/linux/netfilter/xt_RATEEST.h b/include/linux/netfilter/xt_RATEEST.h
new file mode 100644
index 000000000000..670f2e49d4fb
--- /dev/null
+++ b/include/linux/netfilter/xt_RATEEST.h
@@ -0,0 +1,11 @@
+#ifndef _XT_RATEEST_TARGET_H
+#define _XT_RATEEST_TARGET_H
+
+struct xt_rateest_target_info {
+        char                    name[IFNAMSIZ];
+        int8_t                  interval;
+        u_int8_t                ewma_log;
+        struct xt_rateest       *est __attribute__((aligned(8)));
+};
+
+#endif /* _XT_RATEEST_TARGET_H */
diff --git a/include/net/netfilter/xt_rateest.h b/include/net/netfilter/xt_rateest.h
new file mode 100644
index 000000000000..65d594dffbff
--- /dev/null
+++ b/include/net/netfilter/xt_rateest.h
@@ -0,0 +1,17 @@
+#ifndef _XT_RATEEST_H
+#define _XT_RATEEST_H
+
+struct xt_rateest {
+        struct hlist_node               list;
+        char                            name[IFNAMSIZ];
+        unsigned int                    refcnt;
+        spinlock_t                      lock;
+        struct gnet_estimator           params;
+        struct gnet_stats_rate_est      rstats;
+        struct gnet_stats_basic         bstats;
+};
+
+extern struct xt_rateest *xt_rateest_lookup(const char *name);
+extern void xt_rateest_put(struct xt_rateest *est);
+
+#endif /* _XT_RATEEST_H */