Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / netfilter / xt_rateest.c

diff --git a/kernel/net/netfilter/xt_rateest.c b/kernel/net/netfilter/xt_rateest.c
new file mode 100644 (file)
index 0000000..7720b03
--- /dev/null
+++ b/kernel/net/netfilter/xt_rateest.c
@@ -0,0 +1,157 @@
+/*
+ * (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, struct xt_action_param *par)
+{
+       const struct xt_rateest_match_info *info = par->matchinfo;
+       struct gnet_stats_rate_est64 *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 &= pps1 == pps2;
+               break;
+       }
+
+       ret ^= info->flags & XT_RATEEST_MATCH_INVERT ? true : false;
+       return ret;
+}
+
+static int xt_rateest_mt_checkentry(const struct xt_mtchk_param *par)
+{
+       struct xt_rateest_match_info *info = par->matchinfo;
+       struct xt_rateest *est1, *est2;
+       int ret = -EINVAL;
+
+       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;
+       }
+
+       ret  = -ENOENT;
+       est1 = xt_rateest_lookup(info->name1);
+       if (!est1)
+               goto err1;
+
+       est2 = NULL;
+       if (info->flags & XT_RATEEST_MATCH_REL) {
+               est2 = xt_rateest_lookup(info->name2);
+               if (!est2)
+                       goto err2;
+       }
+
+       info->est1 = est1;
+       info->est2 = est2;
+       return 0;
+
+err2:
+       xt_rateest_put(est1);
+err1:
+       return ret;
+}
+
+static void xt_rateest_mt_destroy(const struct xt_mtdtor_param *par)
+{
+       struct xt_rateest_match_info *info = par->matchinfo;
+
+       xt_rateest_put(info->est1);
+       if (info->est2)
+               xt_rateest_put(info->est2);
+}
+
+static struct xt_match xt_rateest_mt_reg __read_mostly = {
+       .name       = "rateest",
+       .revision   = 0,
+       .family     = NFPROTO_UNSPEC,
+       .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_match(&xt_rateest_mt_reg);
+}
+
+static void __exit xt_rateest_mt_fini(void)
+{
+       xt_unregister_match(&xt_rateest_mt_reg);
+}
+
+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);