Add the rt linux 4.1.3-rt3 as base

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

diff --git a/kernel/net/netfilter/xt_connbytes.c b/kernel/net/netfilter/xt_connbytes.c
new file mode 100644 (file)
index 0000000..d4bec26
--- /dev/null
+++ b/kernel/net/netfilter/xt_connbytes.c
@@ -0,0 +1,157 @@
+/* Kernel module to match connection tracking byte counter.
+ * GPL (C) 2002 Martin Devera (devik@cdi.cz).
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/module.h>
+#include <linux/bitops.h>
+#include <linux/skbuff.h>
+#include <linux/math64.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter/xt_connbytes.h>
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_acct.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
+MODULE_DESCRIPTION("Xtables: Number of packets/bytes per connection matching");
+MODULE_ALIAS("ipt_connbytes");
+MODULE_ALIAS("ip6t_connbytes");
+
+static bool
+connbytes_mt(const struct sk_buff *skb, struct xt_action_param *par)
+{
+       const struct xt_connbytes_info *sinfo = par->matchinfo;
+       const struct nf_conn *ct;
+       enum ip_conntrack_info ctinfo;
+       u_int64_t what = 0;     /* initialize to make gcc happy */
+       u_int64_t bytes = 0;
+       u_int64_t pkts = 0;
+       const struct nf_conn_acct *acct;
+       const struct nf_conn_counter *counters;
+
+       ct = nf_ct_get(skb, &ctinfo);
+       if (!ct)
+               return false;
+
+       acct = nf_conn_acct_find(ct);
+       if (!acct)
+               return false;
+
+       counters = acct->counter;
+       switch (sinfo->what) {
+       case XT_CONNBYTES_PKTS:
+               switch (sinfo->direction) {
+               case XT_CONNBYTES_DIR_ORIGINAL:
+                       what = atomic64_read(&counters[IP_CT_DIR_ORIGINAL].packets);
+                       break;
+               case XT_CONNBYTES_DIR_REPLY:
+                       what = atomic64_read(&counters[IP_CT_DIR_REPLY].packets);
+                       break;
+               case XT_CONNBYTES_DIR_BOTH:
+                       what = atomic64_read(&counters[IP_CT_DIR_ORIGINAL].packets);
+                       what += atomic64_read(&counters[IP_CT_DIR_REPLY].packets);
+                       break;
+               }
+               break;
+       case XT_CONNBYTES_BYTES:
+               switch (sinfo->direction) {
+               case XT_CONNBYTES_DIR_ORIGINAL:
+                       what = atomic64_read(&counters[IP_CT_DIR_ORIGINAL].bytes);
+                       break;
+               case XT_CONNBYTES_DIR_REPLY:
+                       what = atomic64_read(&counters[IP_CT_DIR_REPLY].bytes);
+                       break;
+               case XT_CONNBYTES_DIR_BOTH:
+                       what = atomic64_read(&counters[IP_CT_DIR_ORIGINAL].bytes);
+                       what += atomic64_read(&counters[IP_CT_DIR_REPLY].bytes);
+                       break;
+               }
+               break;
+       case XT_CONNBYTES_AVGPKT:
+               switch (sinfo->direction) {
+               case XT_CONNBYTES_DIR_ORIGINAL:
+                       bytes = atomic64_read(&counters[IP_CT_DIR_ORIGINAL].bytes);
+                       pkts  = atomic64_read(&counters[IP_CT_DIR_ORIGINAL].packets);
+                       break;
+               case XT_CONNBYTES_DIR_REPLY:
+                       bytes = atomic64_read(&counters[IP_CT_DIR_REPLY].bytes);
+                       pkts  = atomic64_read(&counters[IP_CT_DIR_REPLY].packets);
+                       break;
+               case XT_CONNBYTES_DIR_BOTH:
+                       bytes = atomic64_read(&counters[IP_CT_DIR_ORIGINAL].bytes) +
+                               atomic64_read(&counters[IP_CT_DIR_REPLY].bytes);
+                       pkts  = atomic64_read(&counters[IP_CT_DIR_ORIGINAL].packets) +
+                               atomic64_read(&counters[IP_CT_DIR_REPLY].packets);
+                       break;
+               }
+               if (pkts != 0)
+                       what = div64_u64(bytes, pkts);
+               break;
+       }
+
+       if (sinfo->count.to >= sinfo->count.from)
+               return what <= sinfo->count.to && what >= sinfo->count.from;
+       else /* inverted */
+               return what < sinfo->count.to || what > sinfo->count.from;
+}
+
+static int connbytes_mt_check(const struct xt_mtchk_param *par)
+{
+       const struct xt_connbytes_info *sinfo = par->matchinfo;
+       int ret;
+
+       if (sinfo->what != XT_CONNBYTES_PKTS &&
+           sinfo->what != XT_CONNBYTES_BYTES &&
+           sinfo->what != XT_CONNBYTES_AVGPKT)
+               return -EINVAL;
+
+       if (sinfo->direction != XT_CONNBYTES_DIR_ORIGINAL &&
+           sinfo->direction != XT_CONNBYTES_DIR_REPLY &&
+           sinfo->direction != XT_CONNBYTES_DIR_BOTH)
+               return -EINVAL;
+
+       ret = nf_ct_l3proto_try_module_get(par->family);
+       if (ret < 0)
+               pr_info("cannot load conntrack support for proto=%u\n",
+                       par->family);
+
+       /*
+        * This filter cannot function correctly unless connection tracking
+        * accounting is enabled, so complain in the hope that someone notices.
+        */
+       if (!nf_ct_acct_enabled(par->net)) {
+               pr_warn("Forcing CT accounting to be enabled\n");
+               nf_ct_set_acct(par->net, true);
+       }
+
+       return ret;
+}
+
+static void connbytes_mt_destroy(const struct xt_mtdtor_param *par)
+{
+       nf_ct_l3proto_module_put(par->family);
+}
+
+static struct xt_match connbytes_mt_reg __read_mostly = {
+       .name       = "connbytes",
+       .revision   = 0,
+       .family     = NFPROTO_UNSPEC,
+       .checkentry = connbytes_mt_check,
+       .match      = connbytes_mt,
+       .destroy    = connbytes_mt_destroy,
+       .matchsize  = sizeof(struct xt_connbytes_info),
+       .me         = THIS_MODULE,
+};
+
+static int __init connbytes_mt_init(void)
+{
+       return xt_register_match(&connbytes_mt_reg);
+}
+
+static void __exit connbytes_mt_exit(void)
+{
+       xt_unregister_match(&connbytes_mt_reg);
+}
+
+module_init(connbytes_mt_init);
+module_exit(connbytes_mt_exit);