Add the rt linux 4.1.3-rt3 as base

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

diff --git a/kernel/net/netfilter/xt_multiport.c b/kernel/net/netfilter/xt_multiport.c
new file mode 100644 (file)
index 0000000..ac1d3c3
--- /dev/null
+++ b/kernel/net/netfilter/xt_multiport.c
@@ -0,0 +1,165 @@
+/* Kernel module to match one of a list of TCP/UDP(-Lite)/SCTP/DCCP ports:
+   ports are in the same place so we can treat them as equal. */
+
+/* (C) 1999-2001 Paul `Rusty' Russell
+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
+ *
+ * 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.
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/udp.h>
+#include <linux/skbuff.h>
+#include <linux/in.h>
+
+#include <linux/netfilter/xt_multiport.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
+MODULE_DESCRIPTION("Xtables: multiple port matching for TCP, UDP, UDP-Lite, SCTP and DCCP");
+MODULE_ALIAS("ipt_multiport");
+MODULE_ALIAS("ip6t_multiport");
+
+/* Returns 1 if the port is matched by the test, 0 otherwise. */
+static inline bool
+ports_match_v1(const struct xt_multiport_v1 *minfo,
+              u_int16_t src, u_int16_t dst)
+{
+       unsigned int i;
+       u_int16_t s, e;
+
+       for (i = 0; i < minfo->count; i++) {
+               s = minfo->ports[i];
+
+               if (minfo->pflags[i]) {
+                       /* range port matching */
+                       e = minfo->ports[++i];
+                       pr_debug("src or dst matches with %d-%d?\n", s, e);
+
+                       if (minfo->flags == XT_MULTIPORT_SOURCE
+                           && src >= s && src <= e)
+                               return true ^ minfo->invert;
+                       if (minfo->flags == XT_MULTIPORT_DESTINATION
+                           && dst >= s && dst <= e)
+                               return true ^ minfo->invert;
+                       if (minfo->flags == XT_MULTIPORT_EITHER
+                           && ((dst >= s && dst <= e)
+                               || (src >= s && src <= e)))
+                               return true ^ minfo->invert;
+               } else {
+                       /* exact port matching */
+                       pr_debug("src or dst matches with %d?\n", s);
+
+                       if (minfo->flags == XT_MULTIPORT_SOURCE
+                           && src == s)
+                               return true ^ minfo->invert;
+                       if (minfo->flags == XT_MULTIPORT_DESTINATION
+                           && dst == s)
+                               return true ^ minfo->invert;
+                       if (minfo->flags == XT_MULTIPORT_EITHER
+                           && (src == s || dst == s))
+                               return true ^ minfo->invert;
+               }
+       }
+
+       return minfo->invert;
+}
+
+static bool
+multiport_mt(const struct sk_buff *skb, struct xt_action_param *par)
+{
+       const __be16 *pptr;
+       __be16 _ports[2];
+       const struct xt_multiport_v1 *multiinfo = par->matchinfo;
+
+       if (par->fragoff != 0)
+               return false;
+
+       pptr = skb_header_pointer(skb, par->thoff, sizeof(_ports), _ports);
+       if (pptr == NULL) {
+               /* We've been asked to examine this packet, and we
+                * can't.  Hence, no choice but to drop.
+                */
+               pr_debug("Dropping evil offset=0 tinygram.\n");
+               par->hotdrop = true;
+               return false;
+       }
+
+       return ports_match_v1(multiinfo, ntohs(pptr[0]), ntohs(pptr[1]));
+}
+
+static inline bool
+check(u_int16_t proto,
+      u_int8_t ip_invflags,
+      u_int8_t match_flags,
+      u_int8_t count)
+{
+       /* Must specify supported protocol, no unknown flags or bad count */
+       return (proto == IPPROTO_TCP || proto == IPPROTO_UDP
+               || proto == IPPROTO_UDPLITE
+               || proto == IPPROTO_SCTP || proto == IPPROTO_DCCP)
+               && !(ip_invflags & XT_INV_PROTO)
+               && (match_flags == XT_MULTIPORT_SOURCE
+                   || match_flags == XT_MULTIPORT_DESTINATION
+                   || match_flags == XT_MULTIPORT_EITHER)
+               && count <= XT_MULTI_PORTS;
+}
+
+static int multiport_mt_check(const struct xt_mtchk_param *par)
+{
+       const struct ipt_ip *ip = par->entryinfo;
+       const struct xt_multiport_v1 *multiinfo = par->matchinfo;
+
+       return check(ip->proto, ip->invflags, multiinfo->flags,
+                    multiinfo->count) ? 0 : -EINVAL;
+}
+
+static int multiport_mt6_check(const struct xt_mtchk_param *par)
+{
+       const struct ip6t_ip6 *ip = par->entryinfo;
+       const struct xt_multiport_v1 *multiinfo = par->matchinfo;
+
+       return check(ip->proto, ip->invflags, multiinfo->flags,
+                    multiinfo->count) ? 0 : -EINVAL;
+}
+
+static struct xt_match multiport_mt_reg[] __read_mostly = {
+       {
+               .name           = "multiport",
+               .family         = NFPROTO_IPV4,
+               .revision       = 1,
+               .checkentry     = multiport_mt_check,
+               .match          = multiport_mt,
+               .matchsize      = sizeof(struct xt_multiport_v1),
+               .me             = THIS_MODULE,
+       },
+       {
+               .name           = "multiport",
+               .family         = NFPROTO_IPV6,
+               .revision       = 1,
+               .checkentry     = multiport_mt6_check,
+               .match          = multiport_mt,
+               .matchsize      = sizeof(struct xt_multiport_v1),
+               .me             = THIS_MODULE,
+       },
+};
+
+static int __init multiport_mt_init(void)
+{
+       return xt_register_matches(multiport_mt_reg,
+              ARRAY_SIZE(multiport_mt_reg));
+}
+
+static void __exit multiport_mt_exit(void)
+{
+       xt_unregister_matches(multiport_mt_reg, ARRAY_SIZE(multiport_mt_reg));
+}
+
+module_init(multiport_mt_init);
+module_exit(multiport_mt_exit);