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@@ -0,0 +1,314 @@
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+/* Kernel module to match one of a list of TCP/UDP ports: ports are in
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+ the same place so we can treat them as equal. */
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+
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+/* (C) 1999-2001 Paul `Rusty' Russell
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+ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/types.h>
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+#include <linux/udp.h>
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+#include <linux/skbuff.h>
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+#include <linux/in.h>
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+
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+#include <linux/netfilter/xt_multiport.h>
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+#include <linux/netfilter/x_tables.h>
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+#include <linux/netfilter_ipv4/ip_tables.h>
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+#include <linux/netfilter_ipv6/ip6_tables.h>
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+
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+MODULE_LICENSE("GPL");
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+MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
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+MODULE_DESCRIPTION("x_tables multiple port match module");
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+MODULE_ALIAS("ipt_multiport");
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+MODULE_ALIAS("ip6t_multiport");
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+
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+#if 0
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+#define duprintf(format, args...) printk(format , ## args)
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+#else
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+#define duprintf(format, args...)
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+#endif
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+
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+/* Returns 1 if the port is matched by the test, 0 otherwise. */
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+static inline int
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+ports_match(const u_int16_t *portlist, enum xt_multiport_flags flags,
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+ u_int8_t count, u_int16_t src, u_int16_t dst)
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+{
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+ unsigned int i;
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+ for (i = 0; i < count; i++) {
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+ if (flags != XT_MULTIPORT_DESTINATION && portlist[i] == src)
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+ return 1;
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+
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+ if (flags != XT_MULTIPORT_SOURCE && portlist[i] == dst)
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+ return 1;
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+ }
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+
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+ return 0;
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+}
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+
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+/* Returns 1 if the port is matched by the test, 0 otherwise. */
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+static inline int
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+ports_match_v1(const struct xt_multiport_v1 *minfo,
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+ u_int16_t src, u_int16_t dst)
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+{
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+ unsigned int i;
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+ u_int16_t s, e;
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+
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+ for (i = 0; i < minfo->count; i++) {
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+ s = minfo->ports[i];
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+
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+ if (minfo->pflags[i]) {
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+ /* range port matching */
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+ e = minfo->ports[++i];
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+ duprintf("src or dst matches with %d-%d?\n", s, e);
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+
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+ if (minfo->flags == XT_MULTIPORT_SOURCE
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+ && src >= s && src <= e)
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+ return 1 ^ minfo->invert;
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+ if (minfo->flags == XT_MULTIPORT_DESTINATION
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+ && dst >= s && dst <= e)
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+ return 1 ^ minfo->invert;
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+ if (minfo->flags == XT_MULTIPORT_EITHER
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+ && ((dst >= s && dst <= e)
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+ || (src >= s && src <= e)))
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+ return 1 ^ minfo->invert;
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+ } else {
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+ /* exact port matching */
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+ duprintf("src or dst matches with %d?\n", s);
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+
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+ if (minfo->flags == XT_MULTIPORT_SOURCE
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+ && src == s)
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+ return 1 ^ minfo->invert;
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+ if (minfo->flags == XT_MULTIPORT_DESTINATION
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+ && dst == s)
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+ return 1 ^ minfo->invert;
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+ if (minfo->flags == XT_MULTIPORT_EITHER
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+ && (src == s || dst == s))
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+ return 1 ^ minfo->invert;
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+ }
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+ }
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+
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+ return minfo->invert;
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+}
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+
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+static int
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+match(const struct sk_buff *skb,
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+ const struct net_device *in,
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+ const struct net_device *out,
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+ const struct xt_match *match,
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+ const void *matchinfo,
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+ int offset,
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+ unsigned int protoff,
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+ int *hotdrop)
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+{
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+ u16 _ports[2], *pptr;
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+ const struct xt_multiport *multiinfo = matchinfo;
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+
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+ if (offset)
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+ return 0;
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+
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+ pptr = skb_header_pointer(skb, protoff, sizeof(_ports), _ports);
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+ if (pptr == NULL) {
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+ /* We've been asked to examine this packet, and we
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+ * can't. Hence, no choice but to drop.
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+ */
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+ duprintf("xt_multiport: Dropping evil offset=0 tinygram.\n");
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+ *hotdrop = 1;
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+ return 0;
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+ }
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+
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+ return ports_match(multiinfo->ports,
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+ multiinfo->flags, multiinfo->count,
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+ ntohs(pptr[0]), ntohs(pptr[1]));
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+}
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+
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+static int
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+match_v1(const struct sk_buff *skb,
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+ const struct net_device *in,
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+ const struct net_device *out,
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+ const struct xt_match *match,
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+ const void *matchinfo,
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+ int offset,
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+ unsigned int protoff,
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+ int *hotdrop)
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+{
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+ u16 _ports[2], *pptr;
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+ const struct xt_multiport_v1 *multiinfo = matchinfo;
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+
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+ if (offset)
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+ return 0;
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+
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+ pptr = skb_header_pointer(skb, protoff, sizeof(_ports), _ports);
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+ if (pptr == NULL) {
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+ /* We've been asked to examine this packet, and we
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+ * can't. Hence, no choice but to drop.
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+ */
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+ duprintf("xt_multiport: Dropping evil offset=0 tinygram.\n");
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+ *hotdrop = 1;
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+ return 0;
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+ }
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+
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+ return ports_match_v1(multiinfo, ntohs(pptr[0]), ntohs(pptr[1]));
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+}
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+
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+static inline int
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+check(u_int16_t proto,
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+ u_int8_t ip_invflags,
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+ u_int8_t match_flags,
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+ u_int8_t count)
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+{
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+ /* Must specify proto == TCP/UDP, no unknown flags or bad count */
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+ return (proto == IPPROTO_TCP || proto == IPPROTO_UDP)
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+ && !(ip_invflags & XT_INV_PROTO)
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+ && (match_flags == XT_MULTIPORT_SOURCE
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+ || match_flags == XT_MULTIPORT_DESTINATION
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+ || match_flags == XT_MULTIPORT_EITHER)
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+ && count <= XT_MULTI_PORTS;
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+}
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+
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+/* Called when user tries to insert an entry of this type. */
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+static int
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+checkentry(const char *tablename,
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+ const void *info,
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+ const struct xt_match *match,
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+ void *matchinfo,
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+ unsigned int matchsize,
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+ unsigned int hook_mask)
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+{
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+ const struct ipt_ip *ip = info;
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+ const struct xt_multiport *multiinfo = matchinfo;
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+
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+ return check(ip->proto, ip->invflags, multiinfo->flags,
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+ multiinfo->count);
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+}
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+
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+static int
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+checkentry_v1(const char *tablename,
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+ const void *info,
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+ const struct xt_match *match,
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+ void *matchinfo,
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+ unsigned int matchsize,
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+ unsigned int hook_mask)
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+{
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+ const struct ipt_ip *ip = info;
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+ const struct xt_multiport_v1 *multiinfo = matchinfo;
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+
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+ return check(ip->proto, ip->invflags, multiinfo->flags,
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+ multiinfo->count);
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+}
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+
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+static int
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+checkentry6(const char *tablename,
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+ const void *info,
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+ const struct xt_match *match,
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+ void *matchinfo,
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+ unsigned int matchsize,
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+ unsigned int hook_mask)
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+{
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+ const struct ip6t_ip6 *ip = info;
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+ const struct xt_multiport *multiinfo = matchinfo;
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+
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+ return check(ip->proto, ip->invflags, multiinfo->flags,
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+ multiinfo->count);
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+}
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+
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+static int
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+checkentry6_v1(const char *tablename,
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+ const void *info,
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+ const struct xt_match *match,
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+ void *matchinfo,
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+ unsigned int matchsize,
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+ unsigned int hook_mask)
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+{
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+ const struct ip6t_ip6 *ip = info;
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+ const struct xt_multiport_v1 *multiinfo = matchinfo;
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+
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+ return check(ip->proto, ip->invflags, multiinfo->flags,
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+ multiinfo->count);
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+}
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+
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+static struct xt_match multiport_match = {
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+ .name = "multiport",
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+ .revision = 0,
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+ .matchsize = sizeof(struct xt_multiport),
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+ .match = &match,
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+ .checkentry = &checkentry,
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+ .family = AF_INET,
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+ .me = THIS_MODULE,
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+};
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+
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+static struct xt_match multiport_match_v1 = {
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+ .name = "multiport",
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+ .revision = 1,
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+ .matchsize = sizeof(struct xt_multiport_v1),
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+ .match = &match_v1,
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+ .checkentry = &checkentry_v1,
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+ .family = AF_INET,
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+ .me = THIS_MODULE,
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+};
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+
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+static struct xt_match multiport6_match = {
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+ .name = "multiport",
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+ .revision = 0,
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+ .matchsize = sizeof(struct xt_multiport),
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+ .match = &match,
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+ .checkentry = &checkentry6,
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+ .family = AF_INET6,
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+ .me = THIS_MODULE,
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+};
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+
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+static struct xt_match multiport6_match_v1 = {
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+ .name = "multiport",
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+ .revision = 1,
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+ .matchsize = sizeof(struct xt_multiport_v1),
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+ .match = &match_v1,
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+ .checkentry = &checkentry6_v1,
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+ .family = AF_INET6,
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+ .me = THIS_MODULE,
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+};
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+
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+static int __init xt_multiport_init(void)
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+{
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+ int ret;
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+
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+ ret = xt_register_match(&multiport_match);
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+ if (ret)
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+ goto out;
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+
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+ ret = xt_register_match(&multiport_match_v1);
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+ if (ret)
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+ goto out_unreg_multi_v0;
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+
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+ ret = xt_register_match(&multiport6_match);
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+ if (ret)
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+ goto out_unreg_multi_v1;
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+
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+ ret = xt_register_match(&multiport6_match_v1);
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+ if (ret)
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+ goto out_unreg_multi6_v0;
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+
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+ return ret;
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+
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+out_unreg_multi6_v0:
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+ xt_unregister_match(&multiport6_match);
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+out_unreg_multi_v1:
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+ xt_unregister_match(&multiport_match_v1);
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+out_unreg_multi_v0:
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+ xt_unregister_match(&multiport_match);
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+out:
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+ return ret;
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+}
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+
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+static void __exit xt_multiport_fini(void)
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+{
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+ xt_unregister_match(&multiport_match);
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+ xt_unregister_match(&multiport_match_v1);
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+ xt_unregister_match(&multiport6_match);
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+ xt_unregister_match(&multiport6_match_v1);
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+}
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+
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+module_init(xt_multiport_init);
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+module_exit(xt_multiport_fini);
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Yasuyuki Kozakai