Add the rt linux 4.1.3-rt3 as base

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

diff --git a/kernel/net/netfilter/nf_nat_proto_common.c b/kernel/net/netfilter/nf_nat_proto_common.c
new file mode 100644 (file)
index 0000000..fbce552
--- /dev/null
+++ b/kernel/net/netfilter/nf_nat_proto_common.c
@@ -0,0 +1,114 @@
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
+ * (C) 2008 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/types.h>
+#include <linux/random.h>
+#include <linux/netfilter.h>
+#include <linux/export.h>
+
+#include <net/netfilter/nf_nat.h>
+#include <net/netfilter/nf_nat_core.h>
+#include <net/netfilter/nf_nat_l3proto.h>
+#include <net/netfilter/nf_nat_l4proto.h>
+
+bool nf_nat_l4proto_in_range(const struct nf_conntrack_tuple *tuple,
+                            enum nf_nat_manip_type maniptype,
+                            const union nf_conntrack_man_proto *min,
+                            const union nf_conntrack_man_proto *max)
+{
+       __be16 port;
+
+       if (maniptype == NF_NAT_MANIP_SRC)
+               port = tuple->src.u.all;
+       else
+               port = tuple->dst.u.all;
+
+       return ntohs(port) >= ntohs(min->all) &&
+              ntohs(port) <= ntohs(max->all);
+}
+EXPORT_SYMBOL_GPL(nf_nat_l4proto_in_range);
+
+void nf_nat_l4proto_unique_tuple(const struct nf_nat_l3proto *l3proto,
+                                struct nf_conntrack_tuple *tuple,
+                                const struct nf_nat_range *range,
+                                enum nf_nat_manip_type maniptype,
+                                const struct nf_conn *ct,
+                                u16 *rover)
+{
+       unsigned int range_size, min, i;
+       __be16 *portptr;
+       u_int16_t off;
+
+       if (maniptype == NF_NAT_MANIP_SRC)
+               portptr = &tuple->src.u.all;
+       else
+               portptr = &tuple->dst.u.all;
+
+       /* If no range specified... */
+       if (!(range->flags & NF_NAT_RANGE_PROTO_SPECIFIED)) {
+               /* If it's dst rewrite, can't change port */
+               if (maniptype == NF_NAT_MANIP_DST)
+                       return;
+
+               if (ntohs(*portptr) < 1024) {
+                       /* Loose convention: >> 512 is credential passing */
+                       if (ntohs(*portptr) < 512) {
+                               min = 1;
+                               range_size = 511 - min + 1;
+                       } else {
+                               min = 600;
+                               range_size = 1023 - min + 1;
+                       }
+               } else {
+                       min = 1024;
+                       range_size = 65535 - 1024 + 1;
+               }
+       } else {
+               min = ntohs(range->min_proto.all);
+               range_size = ntohs(range->max_proto.all) - min + 1;
+       }
+
+       if (range->flags & NF_NAT_RANGE_PROTO_RANDOM) {
+               off = l3proto->secure_port(tuple, maniptype == NF_NAT_MANIP_SRC
+                                                 ? tuple->dst.u.all
+                                                 : tuple->src.u.all);
+       } else if (range->flags & NF_NAT_RANGE_PROTO_RANDOM_FULLY) {
+               off = prandom_u32();
+       } else {
+               off = *rover;
+       }
+
+       for (i = 0; ; ++off) {
+               *portptr = htons(min + off % range_size);
+               if (++i != range_size && nf_nat_used_tuple(tuple, ct))
+                       continue;
+               if (!(range->flags & NF_NAT_RANGE_PROTO_RANDOM_ALL))
+                       *rover = off;
+               return;
+       }
+}
+EXPORT_SYMBOL_GPL(nf_nat_l4proto_unique_tuple);
+
+#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
+int nf_nat_l4proto_nlattr_to_range(struct nlattr *tb[],
+                                  struct nf_nat_range *range)
+{
+       if (tb[CTA_PROTONAT_PORT_MIN]) {
+               range->min_proto.all = nla_get_be16(tb[CTA_PROTONAT_PORT_MIN]);
+               range->max_proto.all = range->min_proto.all;
+               range->flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
+       }
+       if (tb[CTA_PROTONAT_PORT_MAX]) {
+               range->max_proto.all = nla_get_be16(tb[CTA_PROTONAT_PORT_MAX]);
+               range->flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
+       }
+       return 0;
+}
+EXPORT_SYMBOL_GPL(nf_nat_l4proto_nlattr_to_range);
+#endif