Xtables-addons 1.47

The lower support boundary is currently 2.6.32, but vzalloc is only
available since 2.6.37.

configure.ac

@@ -1,4 +1,4 @@
-AC_INIT([xtables-addons], [1.44])
+AC_INIT([xtables-addons], [1.47])
 AC_CONFIG_AUX_DIR([build-aux])
 AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_MACRO_DIR([m4])
@@ -31,7 +31,7 @@ xtlibdir="$(pkg-config --variable=xtlibdir xtables)"
 
 AC_ARG_WITH([xtlibdir],
 	AS_HELP_STRING([--with-xtlibdir=PATH],
-	[Path where to install Xtables extensions [[autodetect]]]]),
+	[Path where to install Xtables extensions [[autodetect]]]),
 	[xtlibdir="$withval"])
 AC_MSG_CHECKING([Xtables module directory])
 AC_MSG_RESULT([$xtlibdir])
@@ -63,8 +63,8 @@ if test -n "$kbuilddir"; then
 		echo "WARNING: Version detection did not succeed. Continue at own luck.";
 	else
 		echo "$kmajor.$kminor.$kmicro.$kstable in $kbuilddir";
-		if test "$kmajor" -gt 3 -o "$kmajor" -eq 3 -a "$kminor" -gt 4; then
+		if test "$kmajor" -gt 3 -o "$kmajor" -eq 3 -a "$kminor" -gt 6; then
-			echo "WARNING: You are trying a newer kernel. Results may vary. :-)";
+			echo "WARNING: That kernel version is not officially supported.";
 		elif test "$kmajor" -eq 3; then
 			:;
 		elif test "$kmajor" -eq 2 -a "$kminor" -eq 6 -a "$kmicro" -ge 32; then

doc/changelog.txt

@@ -3,6 +3,35 @@ HEAD
 ====
 
 
+v1.47 (2010-10-15)
+==================
+Enhancements:
+- xt_psd gained IPv6 support
+Notes for this release:
+- Linux 3.7+ is expressly unsupported by this release.
+
+
+v1.46 (2012-08-23)
+==================
+Fixes:
+- length2, SYSRQ, RAWNAT: preinitialize values for ipv6_find_hdr
+- TARPIT: fix memory leak when tarpit_generic() fails
+- build: remove extraneous closing bracket in configure.ac
+- doc: update xt_SYSRQ.man to reflect that the full IPv6 address is needed
+Enhancements:
+- Support for Linux 3.6
+
+
+v1.45 (2012-07-16)
+==================
+Fixes:
+- build: export missing functions
+  (fixes: "WARNING 'xtnu_ipv6_find_hdr' [xt_TARPIT.ko] not found")
+- build: avoid use of unexported functions
+  (fixes: "WARNING 'ipv6_find_hdr' [xt_TARPIT.ko] not found"
+  in <= linux-2.6.37)
+
+
 v1.44 (2012-07-15)
 ==================
 Fixes:

extensions/compat_xtables.c

@@ -623,6 +623,7 @@ int xtnu_ipv6_skip_exthdr(const struct sk_buff *skb, int start,
 {
 	return ipv6_skip_exthdr(skb, start, nexthdrp);
 }
+EXPORT_SYMBOL_GPL(xtnu_ipv6_skip_exthdr);
 #endif
 
 #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 5, 0) && defined(WITH_IPV6)
@@ -631,6 +632,7 @@ int xtnu_ipv6_find_hdr(const struct sk_buff *skb, unsigned int *offset,
 {
 	return ipv6_find_hdr(skb, offset, target, fragoff);
 }
+EXPORT_SYMBOL_GPL(xtnu_ipv6_find_hdr);
 #endif
 
 MODULE_LICENSE("GPL");

extensions/libxt_SYSRQ.man

@@ -62,7 +62,7 @@ password="password"
 seqno="$(date +%s)"
 salt="$(dd bs=12 count=1 if=/dev/urandom 2>/dev/null |
     openssl enc \-base64)"
-ipaddr=10.10.25.7
+ipaddr="2001:0db8:0000:0000:0000:ff00:0042:8329"
 req="$sysrq_key,$seqno,$salt"
 req="$req,$(echo \-n "$req,$ipaddr,$password" | sha1sum | cut \-c1\-40)"
 
@@ -75,8 +75,8 @@ sysrq key can be used at once, but bear in mind that, for example, a sync may
 not complete before a subsequent reboot or poweroff.
 .PP
 An IPv4 address should have no leading zeros, an IPv6 address should
-be in the form recommended by RFC 5952.  The debug option will log the
+be in the full expanded form (as shown above). The debug option will cause
-correct form of the address.
+output to be emitted in the same form.
 .PP
 The hashing scheme should be enough to prevent mis-use of SYSRQ in many
 environments, but it is not perfect: take reasonable precautions to

extensions/libxt_psd.c

@@ -142,7 +142,7 @@ static struct xtables_match psd_mt_reg = {
 	.name           = "psd",
 	.version        = XTABLES_VERSION,
 	.revision       = 1,
-	.family         = NFPROTO_IPV4,
+	.family         = NFPROTO_UNSPEC,
 	.size           = XT_ALIGN(sizeof(struct xt_psd_info)),
 	.userspacesize	= XT_ALIGN(sizeof(struct xt_psd_info)),
 	.help           = psd_mt_help,

extensions/xt_RAWNAT.c

@@ -244,7 +244,7 @@ static unsigned int
 rawsnat_tg6(struct sk_buff **pskb, const struct xt_action_param *par)
 {
 	const struct xt_rawnat_tginfo *info = par->targinfo;
-	unsigned int l4offset, l4proto;
+	unsigned int l4offset = 0, l4proto;
 	struct ipv6hdr *iph;
 	struct in6_addr new_addr;
 
@@ -265,7 +265,7 @@ static unsigned int
 rawdnat_tg6(struct sk_buff **pskb, const struct xt_action_param *par)
 {
 	const struct xt_rawnat_tginfo *info = par->targinfo;
-	unsigned int l4offset, l4proto;
+	unsigned int l4offset = 0, l4proto;
 	struct ipv6hdr *iph;
 	struct in6_addr new_addr;
 

extensions/xt_SYSRQ.c

@@ -240,7 +240,7 @@ sysrq_tg6(struct sk_buff **pskb, const struct xt_action_param *par)
 	const struct ipv6hdr *iph;
 	const struct udphdr *udph;
 	unsigned short frag_off;
-	unsigned int th_off;
+	unsigned int th_off = 0;
 	uint16_t len;
 
 	if (skb_linearize(skb) < 0)

extensions/xt_TARPIT.c

@@ -237,7 +237,7 @@ static void tarpit_tcp4(struct sk_buff *oldskb, unsigned int hook,
 	((u_int8_t *)tcph)[13] = 0;
 
 	if (!tarpit_generic(tcph, oth, payload, mode))
-		return;
+		goto free_nskb;
 
 	/* Adjust TCP checksum */
 	tcph->check = 0;
@@ -374,16 +374,15 @@ static void tarpit_tcp6(struct sk_buff *oldskb, unsigned int hook,
 	ip6h->daddr = oip6h->saddr;
 
 	/* Adjust IP TTL */
-	if (mode == XTTARPIT_HONEYPOT)
+	if (mode == XTTARPIT_HONEYPOT) {
 		ip6h->hop_limit = 128;
-	else
+	} else {
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 26)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 38)
 		ip6h->hop_limit = ip6_dst_hoplimit(skb_dst(nskb));
 #else
-		ip6h->hop_limit = dst_metric(dst, RTAX_HOPLIMIT);
+		ip6h->hop_limit = dst_metric(skb_dst(nskb), RTAX_HOPLIMIT);
-		if (ip6h->hop_limit < 0)
-			ip6h->hop_limit = ipv6_get_hoplimit((skb_dst(nskb))->dev).
 #endif
+	}
 
 	tcph = (struct tcphdr *)(skb_network_header(nskb) +
 	       sizeof(struct ipv6hdr));
@@ -399,7 +398,7 @@ static void tarpit_tcp6(struct sk_buff *oldskb, unsigned int hook,
 
 	payload = nskb->len - sizeof(struct ipv6hdr) - sizeof(struct tcphdr);
 	if (!tarpit_generic(&oth, tcph, payload, mode))
-		return;
+		goto free_nskb;
 
 	ip6h->payload_len = htons(sizeof(struct tcphdr));
 	tcph->check = 0;

extensions/xt_length2.c

@@ -203,7 +203,8 @@ length2_mt6(const struct sk_buff *skb, struct xt_action_param *par)
 	const struct xt_length_mtinfo2 *info = par->matchinfo;
 	const struct ipv6hdr *iph = ipv6_hdr(skb);
 	unsigned int len = 0, l4proto;
-	unsigned int thoff = par->thoff;
+	/* par->thoff would only set if ip6tables -p was used; so just use 0 */
+	unsigned int thoff = 0;
 	bool hit = true;
 
 	if (info->flags & XT_LENGTH_LAYER3) {

extensions/xt_psd.c

@@ -22,13 +22,14 @@
 
 #define pr_fmt(x) KBUILD_MODNAME ": " x
 #include <linux/module.h>
-#include <linux/moduleparam.h>
 #include <linux/skbuff.h>
-#include <linux/ip.h>
+#include <linux/types.h>
-#include <net/tcp.h>
+#include <linux/tcp.h>
 #include <linux/spinlock.h>
-#include <linux/netfilter_ipv4/ip_tables.h>
 #include <linux/netfilter/x_tables.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <net/ip.h>
+#include <net/ipv6.h>
 #include "xt_psd.h"
 #include "compat_xtables.h"
 
@@ -39,6 +40,7 @@ MODULE_AUTHOR("Jan Rekorajski <baggins@pld.org.pl>");
 MODULE_AUTHOR(" Mohd Nawawi Mohamad Jamili <nawawi@tracenetworkcorporation.com>");
 MODULE_DESCRIPTION("Xtables: PSD - portscan detection");
 MODULE_ALIAS("ipt_psd");
+MODULE_ALIAS("ip6t_psd");
 
 /*
  * Keep track of up to LIST_SIZE source addresses, using a hash table of
@@ -50,6 +52,10 @@ MODULE_ALIAS("ipt_psd");
 #define HASH_SIZE			(1 << HASH_LOG)
 #define HASH_MAX			0x10
 
+#if defined(CONFIG_IP6_NF_IPTABLES) || defined(CONFIG_IP6_NF_IPTABLES_MODULE)
+#	define WITH_IPV6 1
+#endif
+
 /*
  * Information we keep per each target port
  */
@@ -68,8 +74,6 @@ struct port {
 struct host {
 	struct host *next;
 	unsigned long timestamp;
-	struct in_addr src_addr;
-	struct in_addr dest_addr;
 	__be16 src_port;
 	uint16_t count;
 	uint8_t weight;
@@ -77,27 +81,87 @@ struct host {
 };
 
 /**
- * State information.
+ * Information we keep per ipv4 source address.
+ */
+struct host4 {
+	struct host host;
+	__be32 saddr;
+};
+
+static struct host4 *host_to_host4(const struct host *h)
+{
+	return (struct host4 *)h;
+}
+
+struct host6 {
+	struct host host;
+	struct in6_addr saddr;
+};
+
+/**
+ * State information for IPv4 portscan detection.
  * @list:	list of source addresses
  * @hash:	pointers into the list
  * @index:	oldest entry to be replaced
  */
 static struct {
 	spinlock_t lock;
-	struct host list[LIST_SIZE];
+	struct host4 list[LIST_SIZE];
 	struct host *hash[HASH_SIZE];
 	int index;
 } state;
 
+#ifdef WITH_IPV6
+/**
+ * State information for IPv6 portscan detection.
+ * @list:	list of source addresses
+ * @hash:	pointers into the list
+ * @index:	oldest entry to be replaced
+ */
+static struct {
+	spinlock_t lock;
+	struct host6 *list;
+	struct host **hash;
+	int index;
+} state6;
+
+static struct host6 *host_to_host6(const struct host *h)
+{
+	return (struct host6 *) h;
+}
+
+/**
+ * allocate state6 memory only when needed
+ */
+static bool state6_alloc_mem(void)
+{
+	if (state6.hash != NULL)
+		return true;
+
+	state6.list = vmalloc(LIST_SIZE * sizeof(struct host6));
+	if (state6.list == NULL)
+		return false;
+	memset(state6.list, 0, LIST_SIZE * sizeof(struct host6));
+
+	state6.hash = vmalloc(HASH_SIZE * sizeof(struct host*));
+	if (state6.hash == NULL) {
+		vfree(state6.list);
+		return false;
+	}
+	memset(state6.hash, 0, HASH_SIZE * sizeof(struct host *));
+	return true;
+}
+#endif
+
 /*
  * Convert an IP address into a hash table index.
  */
-static inline int hashfunc(struct in_addr addr)
+static unsigned int hashfunc(__be32 addr)
 {
 	unsigned int value;
-	int hash;
+	unsigned int hash;
 
-	value = addr.s_addr;
+	value = addr;
 	hash = 0;
 	do {
 		hash ^= value;
@@ -106,133 +170,169 @@ static inline int hashfunc(struct in_addr addr)
 	return hash & (HASH_SIZE - 1);
 }
 
-static bool
+static inline unsigned int hashfunc6(const struct in6_addr *addr)
-xt_psd_match(const struct sk_buff *pskb, struct xt_action_param *match)
+{
+	__be32 h = addr->s6_addr32[0] ^ addr->s6_addr32[1];
+	return hashfunc(h ^ addr->s6_addr32[2] ^ addr->s6_addr32[3]);
+}
+
+static bool port_in_list(struct host *host, uint8_t proto, uint16_t port)
+{
+	unsigned int i;
+
+	for (i = 0; i < host->count; ++i) {
+		if (host->ports[i].proto != proto)
+			continue;
+		if (host->ports[i].number == port)
+			return true;
+	}
+	return false;
+}
+
+static uint16_t get_port_weight(const struct xt_psd_info *psd, __be16 port)
+{
+	return ntohs(port) < 1024 ? psd->lo_ports_weight : psd->hi_ports_weight;
+}
+
+static bool
+is_portscan(struct host *host, const struct xt_psd_info *psdinfo,
+            const struct tcphdr *tcph, uint8_t proto)
+{
+	if (port_in_list(host, proto, tcph->dest))
+		return false;
+
+	/*
+	 * TCP/ACK and/or TCP/RST to a new port? This could be an
+	 * outgoing connection.
+	 */
+	if (proto == IPPROTO_TCP && (tcph->ack || tcph->rst))
+		return false;
+
+	host->timestamp = jiffies;
+
+	if (host->weight >= psdinfo->weight_threshold) /* already matched */
+		return true;
+
+	/* Update the total weight */
+	host->weight += get_port_weight(psdinfo, tcph->dest);
+
+	/* Got enough destination ports to decide that this is a scan? */
+	if (host->weight >= psdinfo->weight_threshold)
+		return true;
+
+	/* Remember the new port */
+	if (host->count < ARRAY_SIZE(host->ports)) {
+		host->ports[host->count].number = tcph->dest;
+		host->ports[host->count].proto = proto;
+		host->count++;
+	}
+	return false;
+}
+
+static struct host *host_get_next(struct host *h, struct host **last)
+{
+	if (h->next != NULL)
+		*last = h;
+	return h->next;
+}
+
+static void ht_unlink(struct host **head, struct host *last)
+{
+	if (last != NULL)
+		last->next = last->next->next;
+	else if (*head != NULL)
+		*head = (*head)->next;
+}
+
+static bool
+entry_is_recent(const struct host *h, unsigned long delay_threshold,
+                unsigned long now)
+{
+	return now - h->timestamp <= (delay_threshold * HZ) / 100 &&
+	       time_after_eq(now, h->timestamp);
+}
+
+static void remove_oldest(struct host **head, struct host *curr)
+{
+	struct host *h, *last = NULL;
+
+	/*
+	 * We are going to re-use the oldest list entry, so remove it from the
+	 * hash table first, if it is really already in use.
+	 */
+	h = *head;
+	while (h != NULL) {
+		if (curr == h)
+			break;
+		last = h;
+		h = h->next;
+	}
+
+	/* Then, remove it */
+	if (h != NULL)
+		ht_unlink(head, last);
+}
+
+static void *
+get_header_pointer4(const struct sk_buff *skb, unsigned int thoff, void *mem)
+{
+	const struct iphdr *iph = ip_hdr(skb);
+	int hdrlen;
+
+	switch (iph->protocol) {
+	case IPPROTO_TCP:
+		hdrlen = sizeof(struct tcphdr);
+		break;
+	case IPPROTO_UDP:
+	case IPPROTO_UDPLITE:
+		hdrlen = sizeof(struct udphdr);
+		break;
+	default:
+		return NULL;
+	}
+
+	return skb_header_pointer(skb, thoff, hdrlen, mem);
+}
+
+static bool
+handle_packet4(const struct iphdr *iph, const struct tcphdr *tcph,
+               const struct xt_psd_info *psdinfo, unsigned int hash)
 {
-	const struct iphdr *iph;
-	const struct tcphdr *tcph = NULL;
-	const struct udphdr *udph;
-	union {
-		struct tcphdr tcph;
-		struct udphdr udph;
-	} _buf;
-	struct in_addr addr;
-	u_int16_t src_port,dest_port;
-	u_int8_t proto;
 	unsigned long now;
-	struct host *curr, *last, **head;
+	struct host *curr, *last = NULL, **head;
-	int hash, index, count;
+	struct host4 *curr4;
-	/* Parameters from userspace */
+	int count = 0;
-	const struct xt_psd_info *psdinfo = match->matchinfo;
-
-	iph = ip_hdr(pskb);
-	if (iph->frag_off & htons(IP_OFFSET)) {
-		pr_debug("sanity check failed\n");
-		return false;
-	}
-
-	proto = iph->protocol;
-	addr.s_addr = iph->saddr;
-	/* We're using IP address 0.0.0.0 for a special purpose here, so don't let
-	 * them spoof us. [DHCP needs this feature - HW] */
-	if (addr.s_addr == 0) {
-		pr_debug("spoofed source address (0.0.0.0)\n");
-		return false;
-	}
-
-	if (proto == IPPROTO_TCP) {
-		tcph = skb_header_pointer(pskb, match->thoff,
-		       sizeof(_buf.tcph), &_buf.tcph);
-		if (tcph == NULL)
-			return false;
-
-		/* Yep, it's dirty */
-		src_port = tcph->source;
-		dest_port = tcph->dest;
-	} else if (proto == IPPROTO_UDP || proto == IPPROTO_UDPLITE) {
-		udph = skb_header_pointer(pskb, match->thoff,
-		       sizeof(_buf.udph), &_buf.udph);
-		if (udph == NULL)
-			return false;
-		src_port  = udph->source;
-		dest_port = udph->dest;
-	} else {
-		pr_debug("protocol not supported\n");
-		return false;
-	}
 
 	now = jiffies;
-
+	head = &state.hash[hash];
-	spin_lock(&state.lock);
 
 	/* Do we know this source address already? */
-	count = 0;
+	curr = *head;
-	last = NULL;
+	while (curr != NULL) {
-	if ((curr = *(head = &state.hash[hash = hashfunc(addr)])) != NULL)
+		curr4 = host_to_host4(curr);
-		do {
+		if (curr4->saddr == iph->saddr)
-			if (curr->src_addr.s_addr == addr.s_addr)
+			break;
-				break;
+		count++;
-			count++;
+		curr = host_get_next(curr, &last);
-			if (curr->next != NULL)
+	}
-				last = curr;
-		} while ((curr = curr->next) != NULL);
 
 	if (curr != NULL) {
 		/* We know this address, and the entry isn't too old. Update it. */
-		if (now - curr->timestamp <= (psdinfo->delay_threshold*HZ)/100 &&
+		if (entry_is_recent(curr, psdinfo->delay_threshold, now))
-		    time_after_eq(now, curr->timestamp)) {
+			return is_portscan(curr, psdinfo, tcph, iph->protocol);
-
-			/* Just update the appropriate list entry if we've seen this port already */
-			for (index = 0; index < curr->count; index++) {
-				if (curr->ports[index].number == dest_port) {
-					curr->ports[index].proto = proto;
-					goto out_no_match;
-				}
-			}
-
-			/* TCP/ACK and/or TCP/RST to a new port? This could be an outgoing connection. */
-			if (proto == IPPROTO_TCP && (tcph->ack || tcph->rst))
-				goto out_no_match;
-
-			/* Packet to a new port, and not TCP/ACK: update the timestamp */
-			curr->timestamp = now;
-
-			/* Matched this scan already? Then Leave. */
-			if (curr->weight >= psdinfo->weight_threshold)
-				goto out_match;
-
-			/* Update the total weight */
-			curr->weight += (ntohs(dest_port) < 1024) ?
-				psdinfo->lo_ports_weight : psdinfo->hi_ports_weight;
-
-			/* Got enough destination ports to decide that this is a scan? */
-			if (curr->weight >= psdinfo->weight_threshold)
-				goto out_match;
-
-			/* Remember the new port */
-			if (curr->count < ARRAY_SIZE(curr->ports)) {
-				curr->ports[curr->count].number = dest_port;
-				curr->ports[curr->count].proto = proto;
-				curr->count++;
-			}
-
-			goto out_no_match;
-		}
 
 		/* We know this address, but the entry is outdated. Mark it unused, and
 		 * remove from the hash table. We'll allocate a new entry instead since
 		 * this one might get re-used too soon. */
-		curr->src_addr.s_addr = 0;
+		curr4 = host_to_host4(curr);
-		if (last != NULL)
+		curr4->saddr = 0;
-			last->next = last->next->next;
+		ht_unlink(head, last);
-		else if (*head != NULL)
-			*head = (*head)->next;
 		last = NULL;
 	}
 
 	/* We don't need an ACK from a new source address */
-	if (proto == IPPROTO_TCP && tcph->ack)
+	if (iph->protocol == IPPROTO_TCP && tcph->ack)
-		goto out_no_match;
+		return false;
 
 	/* Got too many source addresses with the same hash value? Then remove the
 	 * oldest one from the hash table, so that they can't take too much of our
@@ -240,33 +340,15 @@ xt_psd_match(const struct sk_buff *pskb, struct xt_action_param *match)
 	if (count >= HASH_MAX && last != NULL)
 		last->next = NULL;
 
-	/* We're going to re-use the oldest list entry, so remove it from the hash
+	if (state.list[state.index].saddr != 0)
-	 * table first (if it is really already in use, and isn't removed from the
+		head = &state.hash[hashfunc(state.list[state.index].saddr)];
-	 * hash table already because of the HASH_MAX check above). */
-
-	/* First, find it */
-	if (state.list[state.index].src_addr.s_addr != 0)
-		head = &state.hash[hashfunc(state.list[state.index].src_addr)];
 	else
 		head = &last;
-	last = NULL;
-	if ((curr = *head) != NULL)
-		do {
-			if (curr == &state.list[state.index])
-				break;
-			last = curr;
-		} while ((curr = curr->next) != NULL);
-
-	/* Then, remove it */
-	if (curr != NULL) {
-		if (last != NULL)
-			last->next = last->next->next;
-		else if (*head != NULL)
-			*head = (*head)->next;
-	}
 
 	/* Get our list entry */
-	curr = &state.list[state.index++];
+	curr4 = &state.list[state.index++];
+	curr = &curr4->host;
+	remove_oldest(head, curr);
 	if (state.index >= LIST_SIZE)
 		state.index = 0;
 
@@ -276,24 +358,173 @@ xt_psd_match(const struct sk_buff *pskb, struct xt_action_param *match)
 	*head = curr;
 
 	/* And fill in the fields */
+	curr4 = host_to_host4(curr);
+	curr4->saddr = iph->saddr;
 	curr->timestamp = now;
-	curr->src_addr = addr;
-	curr->dest_addr.s_addr = iph->daddr;
-	curr->src_port = src_port;
 	curr->count = 1;
-	curr->weight = (ntohs(dest_port) < 1024) ? psdinfo->lo_ports_weight : psdinfo->hi_ports_weight;
+	curr->weight = get_port_weight(psdinfo, tcph->dest);
-	curr->ports[0].number = dest_port;
+	curr->ports[0].number = tcph->dest;
-	curr->ports[0].proto = proto;
+	curr->ports[0].proto = iph->protocol;
-
-out_no_match:
-	spin_unlock(&state.lock);
 	return false;
-
-out_match:
-	spin_unlock(&state.lock);
-	return true;
 }
 
+static bool
+xt_psd_match(const struct sk_buff *pskb, struct xt_action_param *match)
+{
+	struct iphdr *iph = ip_hdr(pskb);
+	struct tcphdr _tcph;
+	struct tcphdr *tcph;
+	bool matched;
+	unsigned int hash;
+	/* Parameters from userspace */
+	const struct xt_psd_info *psdinfo = match->matchinfo;
+
+	if (iph->frag_off & htons(IP_OFFSET)) {
+		pr_debug("sanity check failed\n");
+		return false;
+	}
+
+	/*
+	 * We are using IP address 0.0.0.0 for a special purpose here, so do
+	 * not let them spoof us. [DHCP needs this feature - HW]
+	 */
+	if (iph->saddr == 0) {
+		pr_debug("spoofed source address (0.0.0.0)\n");
+		return false;
+	}
+
+	tcph = get_header_pointer4(pskb, match->thoff, &_tcph);
+	if (tcph == NULL)
+		return false;
+
+	hash = hashfunc(iph->saddr);
+
+	spin_lock(&state.lock);
+	matched = handle_packet4(iph, tcph, psdinfo, hash);
+	spin_unlock(&state.lock);
+	return matched;
+}
+
+#ifdef WITH_IPV6
+static bool
+handle_packet6(const struct ipv6hdr *ip6h, const struct tcphdr *tcph,
+	       const struct xt_psd_info *psdinfo, uint8_t proto, int hash)
+{
+	unsigned long now;
+	struct host *curr, *last = NULL, **head;
+	struct host6 *curr6;
+	int count = 0;
+
+	now = jiffies;
+	head = &state6.hash[hash];
+
+	curr = *head;
+	while (curr != NULL) {
+		curr6 = host_to_host6(curr);
+		if (ipv6_addr_equal(&curr6->saddr, &ip6h->saddr))
+			break;
+		count++;
+		curr = host_get_next(curr, &last);
+	}
+
+	if (curr != NULL) {
+		if (entry_is_recent(curr, psdinfo->delay_threshold, now))
+			return is_portscan(curr, psdinfo, tcph, proto);
+		curr6 = host_to_host6(curr);
+		memset(&curr6->saddr, 0, sizeof(curr6->saddr));
+		ht_unlink(head, last);
+		last = NULL;
+	}
+
+	if (proto == IPPROTO_TCP && tcph->ack)
+		return false;
+
+	if (count >= HASH_MAX && last != NULL)
+		last->next = NULL;
+
+	if (!ipv6_addr_any(&state6.list[state6.index].saddr))
+		head = &state6.hash[hashfunc6(&state6.list[state6.index].saddr)];
+	else
+		head = &last;
+
+	curr6 = &state6.list[state6.index++];
+	curr = &curr6->host;
+	remove_oldest(head, curr);
+	if (state6.index >= LIST_SIZE)
+		state6.index = 0;
+
+	head = &state6.hash[hash];
+	curr->next = *head;
+	*head = curr;
+
+	curr6 = host_to_host6(curr);
+	curr6->saddr = ip6h->saddr;
+	curr->timestamp = now;
+	curr->count = 1;
+	curr->weight = get_port_weight(psdinfo, tcph->dest);
+	curr->ports[0].number = tcph->dest;
+	curr->ports[0].proto = proto;
+	return false;
+}
+
+static void *
+get_header_pointer6(const struct sk_buff *skb, void *mem, uint8_t *proto)
+{
+	static const uint8_t types[] = {IPPROTO_TCP,
+				        IPPROTO_UDP, IPPROTO_UDPLITE};
+	unsigned int i, offset = 0;
+	int err;
+	size_t hdrlen;
+
+	for (i = 0; i < ARRAY_SIZE(types); ++i) {
+		err = ipv6_find_hdr(skb, &offset, types[i], NULL, NULL);
+		if (err < 0)
+			continue;
+
+		switch (types[i]) {
+		case IPPROTO_TCP:
+			hdrlen = sizeof(struct tcphdr);
+			break;
+		case IPPROTO_UDP:
+		case IPPROTO_UDPLITE:
+			hdrlen = sizeof(struct udphdr);
+			break;
+		default:
+			return NULL;
+		}
+		*proto = types[i];
+		return skb_header_pointer(skb, offset, hdrlen, mem);
+	}
+	return NULL;
+}
+
+static bool
+xt_psd_match6(const struct sk_buff *pskb, struct xt_action_param *match)
+{
+	const struct ipv6hdr *ip6h = ipv6_hdr(pskb);
+	struct tcphdr _tcph;
+	struct tcphdr *tcph;
+	uint8_t proto = 0;
+	bool matched;
+	int hash;
+	const struct xt_psd_info *psdinfo = match->matchinfo;
+
+	if (ipv6_addr_any(&ip6h->saddr))
+		return false;
+
+	tcph = get_header_pointer6(pskb, &_tcph, &proto);
+	if (tcph == NULL)
+		return false;
+
+	hash = hashfunc6(&ip6h->saddr);
+
+	spin_lock(&state6.lock);
+	matched = handle_packet6(ip6h, tcph, psdinfo, proto, hash);
+	spin_unlock(&state6.lock);
+	return matched;
+}
+#endif
+
 static int psd_mt_check(const struct xt_mtchk_param *par)
 {
 	const struct xt_psd_info *info = par->matchinfo;
@@ -315,25 +546,53 @@ static int psd_mt_check(const struct xt_mtchk_param *par)
 	return 0;
 }
 
-static struct xt_match xt_psd_reg __read_mostly = {
+#ifdef WITH_IPV6
-	.name       = "psd",
+static int psd_mt_check6(const struct xt_mtchk_param *par)
-	.family     = NFPROTO_IPV4,
+{
-	.revision   = 1,
+	if (!state6_alloc_mem())
-	.checkentry = psd_mt_check,
+		return -ENOMEM;
-	.match      = xt_psd_match,
+	return psd_mt_check(par);
-	.matchsize  = sizeof(struct xt_psd_info),
+}
-	.me         = THIS_MODULE,
+#endif
+
+static struct xt_match xt_psd_reg[] __read_mostly = {
+	{
+		.name       = "psd",
+		.family     = NFPROTO_IPV4,
+		.revision   = 1,
+		.checkentry = psd_mt_check,
+		.match      = xt_psd_match,
+		.matchsize  = sizeof(struct xt_psd_info),
+		.me         = THIS_MODULE,
+#ifdef WITH_IPV6
+	}, {
+		.name       = "psd",
+		.family     = NFPROTO_IPV6,
+		.revision   = 1,
+		.checkentry = psd_mt_check6,
+		.match      = xt_psd_match6,
+		.matchsize  = sizeof(struct xt_psd_info),
+		.me         = THIS_MODULE,
+#endif
+	}
 };
 
 static int __init xt_psd_init(void)
 {
 	spin_lock_init(&(state.lock));
-	return xt_register_match(&xt_psd_reg);
+#ifdef WITH_IPV6
+	spin_lock_init(&(state6.lock));
+#endif
+	return xt_register_matches(xt_psd_reg, ARRAY_SIZE(xt_psd_reg));
 }
 
 static void __exit xt_psd_exit(void)
 {
-        xt_unregister_match(&xt_psd_reg);
+        xt_unregister_matches(xt_psd_reg, ARRAY_SIZE(xt_psd_reg));
+#ifdef WITH_IPV6
+	vfree(state6.list);
+	vfree(state6.hash);
+#endif
 }
 
 module_init(xt_psd_init);

xtables-addons.8.in

@@ -1,4 +1,4 @@
-.TH xtables-addons 8 "v1.44 (2012-07-15)" "" "v1.44 (2012-07-15)"
+.TH xtables-addons 8 "v1.47 (2012-10-15)" "" "v1.47 (2012-10-15)"
 .SH Name
 Xtables-addons \(em additional extensions for iptables, ip6tables, etc.
 .SH Targets