[NETFILTER]: x_tables: add rateest match

Add rate estimator match. The rate estimator match can match on
estimated rates by the RATEEST target. It supports matching on
absolute bps/pps values, comparing two rate estimators and matching
on the difference between two rate estimators.

This is what I use to route outgoing data connections from a FTP
server over two lines based on the  available bandwidth:

# estimate outgoing rates
iptables -t mangle -A POSTROUTING -o eth0 -j RATEEST --rateest-name eth0 \
                                                     --rateest-interval 250ms \
                                                     --rateest-ewma 0.5s
iptables -t mangle -A POSTROUTING -o ppp0 -j RATEEST --rateest-name ppp0 \
                                                     --rateest-interval 250ms \
                                                     --rateest-ewma 0.5s

# mark based on available bandwidth
iptables -t mangle -A BALANCE -m state --state NEW \
                              -m helper --helper ftp \
                              -m rateest --rateest-delta \
                                         --rateest1 eth0 \
                                         --rateest-bps1 2.5mbit \
                                         --rateest-gt \
                                         --rateest2 ppp0 \
                                         --rateest-bps2 2mbit \
                              -j CONNMARK --set-mark 0x1

iptables -t mangle -A BALANCE -m state --state NEW \
                              -m helper --helper ftp \
                              -m rateest --rateest-delta \
                                         --rateest1 ppp0 \
                                         --rateest-bps1 2mbit \
                                         --rateest-gt \
                                         --rateest2 eth0 \
                                         --rateest-bps2 2.5mbit \
                              -j CONNMARK --set-mark 0x2

iptables -t mangle -A BALANCE -j CONNMARK --restore-mark

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

2 files changed, 34 insertions, 0 deletions

diff --git a/include/linux/netfilter/Kbuild b/include/linux/netfilter/Kbuild
index 707a15854430..ac9e6429f747 100644
--- a/include/linux/netfilter/Kbuild
+++ b/include/linux/netfilter/Kbuild
@@ -30,6 +30,7 @@ header-y += xt_multiport.h
 header-y += xt_owner.h
 header-y += xt_pkttype.h
 header-y += xt_policy.h
+header-y += xt_rateest.h
 header-y += xt_realm.h
 header-y += xt_sctp.h
 header-y += xt_state.h
diff --git a/include/linux/netfilter/xt_rateest.h b/include/linux/netfilter/xt_rateest.h
new file mode 100644
index 000000000000..51948e15aea2
--- /dev/null
+++ b/include/linux/netfilter/xt_rateest.h
@@ -0,0 +1,33 @@
+#ifndef _XT_RATEEST_MATCH_H
+#define _XT_RATEEST_MATCH_H
+
+enum xt_rateest_match_flags {
+        XT_RATEEST_MATCH_INVERT = 1<<0,
+        XT_RATEEST_MATCH_ABS    = 1<<1,
+        XT_RATEEST_MATCH_REL    = 1<<2,
+        XT_RATEEST_MATCH_DELTA  = 1<<3,
+        XT_RATEEST_MATCH_BPS    = 1<<4,
+        XT_RATEEST_MATCH_PPS    = 1<<5,
+};
+
+enum xt_rateest_match_mode {
+        XT_RATEEST_MATCH_NONE,
+        XT_RATEEST_MATCH_EQ,
+        XT_RATEEST_MATCH_LT,
+        XT_RATEEST_MATCH_GT,
+};
+
+struct xt_rateest_match_info {
+        char                    name1[IFNAMSIZ];
+        char                    name2[IFNAMSIZ];
+        u_int16_t               flags;
+        u_int16_t               mode;
+        u_int32_t               bps1;
+        u_int32_t               pps1;
+        u_int32_t               bps2;
+        u_int32_t               pps2;
+        struct xt_rateest       *est1 __attribute__((aligned(8)));
+        struct xt_rateest       *est2 __attribute__((aligned(8)));
+};
+
+#endif /* _XT_RATEEST_MATCH_H */