[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>
diff --git a/net/netfilter/xt_rateest.c b/net/netfilter/xt_rateest.c
new file mode 100644
index 0000000..fdb86a5
--- /dev/null
+++ b/net/netfilter/xt_rateest.c
@@ -0,0 +1,178 @@
+/*
+ * (C) 2007 Patrick McHardy <kaber@trash.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/gen_stats.h>
+
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_rateest.h>
+#include <net/netfilter/xt_rateest.h>
+
+
+static bool xt_rateest_mt(const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const struct xt_match *match,
+ const void *matchinfo,
+ int offset,
+ unsigned int protoff,
+ bool *hotdrop)
+{
+ const struct xt_rateest_match_info *info = matchinfo;
+ struct gnet_stats_rate_est *r;
+ u_int32_t bps1, bps2, pps1, pps2;
+ bool ret = true;
+
+ spin_lock_bh(&info->est1->lock);
+ r = &info->est1->rstats;
+ if (info->flags & XT_RATEEST_MATCH_DELTA) {
+ bps1 = info->bps1 >= r->bps ? info->bps1 - r->bps : 0;
+ pps1 = info->pps1 >= r->pps ? info->pps1 - r->pps : 0;
+ } else {
+ bps1 = r->bps;
+ pps1 = r->pps;
+ }
+ spin_unlock_bh(&info->est1->lock);
+
+ if (info->flags & XT_RATEEST_MATCH_ABS) {
+ bps2 = info->bps2;
+ pps2 = info->pps2;
+ } else {
+ spin_lock_bh(&info->est2->lock);
+ r = &info->est2->rstats;
+ if (info->flags & XT_RATEEST_MATCH_DELTA) {
+ bps2 = info->bps2 >= r->bps ? info->bps2 - r->bps : 0;
+ pps2 = info->pps2 >= r->pps ? info->pps2 - r->pps : 0;
+ } else {
+ bps2 = r->bps;
+ pps2 = r->pps;
+ }
+ spin_unlock_bh(&info->est2->lock);
+ }
+
+ switch (info->mode) {
+ case XT_RATEEST_MATCH_LT:
+ if (info->flags & XT_RATEEST_MATCH_BPS)
+ ret &= bps1 < bps2;
+ if (info->flags & XT_RATEEST_MATCH_PPS)
+ ret &= pps1 < pps2;
+ break;
+ case XT_RATEEST_MATCH_GT:
+ if (info->flags & XT_RATEEST_MATCH_BPS)
+ ret &= bps1 > bps2;
+ if (info->flags & XT_RATEEST_MATCH_PPS)
+ ret &= pps1 > pps2;
+ break;
+ case XT_RATEEST_MATCH_EQ:
+ if (info->flags & XT_RATEEST_MATCH_BPS)
+ ret &= bps1 == bps2;
+ if (info->flags & XT_RATEEST_MATCH_PPS)
+ ret &= pps2 == pps2;
+ break;
+ }
+
+ ret ^= info->flags & XT_RATEEST_MATCH_INVERT ? true : false;
+ return ret;
+}
+
+static bool xt_rateest_mt_checkentry(const char *tablename,
+ const void *ip,
+ const struct xt_match *match,
+ void *matchinfo,
+ unsigned int hook_mask)
+{
+ struct xt_rateest_match_info *info = (void *)matchinfo;
+ struct xt_rateest *est1, *est2;
+
+ if (hweight32(info->flags & (XT_RATEEST_MATCH_ABS |
+ XT_RATEEST_MATCH_REL)) != 1)
+ goto err1;
+
+ if (!(info->flags & (XT_RATEEST_MATCH_BPS | XT_RATEEST_MATCH_PPS)))
+ goto err1;
+
+ switch (info->mode) {
+ case XT_RATEEST_MATCH_EQ:
+ case XT_RATEEST_MATCH_LT:
+ case XT_RATEEST_MATCH_GT:
+ break;
+ default:
+ goto err1;
+ }
+
+ est1 = xt_rateest_lookup(info->name1);
+ if (!est1)
+ goto err1;
+
+ if (info->flags & XT_RATEEST_MATCH_REL) {
+ est2 = xt_rateest_lookup(info->name2);
+ if (!est2)
+ goto err2;
+ } else
+ est2 = NULL;
+
+
+ info->est1 = est1;
+ info->est2 = est2;
+ return true;
+
+err2:
+ xt_rateest_put(est1);
+err1:
+ return false;
+}
+
+static void xt_rateest_mt_destroy(const struct xt_match *match,
+ void *matchinfo)
+{
+ struct xt_rateest_match_info *info = (void *)matchinfo;
+
+ xt_rateest_put(info->est1);
+ if (info->est2)
+ xt_rateest_put(info->est2);
+}
+
+static struct xt_match xt_rateest_match[] __read_mostly = {
+ {
+ .family = AF_INET,
+ .name = "rateest",
+ .match = xt_rateest_mt,
+ .checkentry = xt_rateest_mt_checkentry,
+ .destroy = xt_rateest_mt_destroy,
+ .matchsize = sizeof(struct xt_rateest_match_info),
+ .me = THIS_MODULE,
+ },
+ {
+ .family = AF_INET6,
+ .name = "rateest",
+ .match = xt_rateest_mt,
+ .checkentry = xt_rateest_mt_checkentry,
+ .destroy = xt_rateest_mt_destroy,
+ .matchsize = sizeof(struct xt_rateest_match_info),
+ .me = THIS_MODULE,
+ },
+};
+
+static int __init xt_rateest_mt_init(void)
+{
+ return xt_register_matches(xt_rateest_match,
+ ARRAY_SIZE(xt_rateest_match));
+}
+
+static void __exit xt_rateest_mt_fini(void)
+{
+ xt_unregister_matches(xt_rateest_match, ARRAY_SIZE(xt_rateest_match));
+}
+
+MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("xtables rate estimator match");
+MODULE_ALIAS("ipt_rateest");
+MODULE_ALIAS("ip6t_rateest");
+module_init(xt_rateest_mt_init);
+module_exit(xt_rateest_mt_fini);
