upgrade to the new version of wprobe - includes reconfigurable layer 2 statistics, remote access, more configuration options and many bugfixes

SVN-Revision: 16719

15 files changed, 2295 insertions, 809 deletions

diff --git a/package/wprobe/Makefile b/package/wprobe/Makefile
index a28ad93..1e32eee 100644
--- a/package/wprobe/Makefile
+++ b/package/wprobe/Makefile
@@ -30,22 +30,22 @@ define KernelPackage/wprobe/description
   A module that exports measurement data from wireless driver to user space
 endef
 
-define Package/wprobe-info
+define Package/wprobe-util
   SECTION:=net
   CATEGORY:=Network
   DEPENDS:=+kmod-wprobe +libnl-tiny
   TITLE:=Wireless measurement utility
 endef
 
-define Package/wprobe-info/description
-  wprobe-info uses the wprobe kernel module to query
+define Package/wprobe-util/description
+  wprobe-util uses the wprobe kernel module to query
   wireless driver measurement data from an interface
 endef
 
 define Package/wprobe-export
   SECTION:=net
   CATEGORY:=Network
-  DEPENDS:=+wprobe-info
+  DEPENDS:=+wprobe-util
   TITLE:=Wireless measurement data exporter
 endef
 
@@ -82,6 +82,7 @@ define Build/Compile/lib
 		CFLAGS="$(TARGET_CFLAGS)" \
 		CPPFLAGS="$(TARGET_CPPFLAGS) -I$(PKG_BUILD_DIR)/kernel" \
 		LDFLAGS="$(TARGET_LDFLAGS)" \
+		HOST_OS=Linux \
 		LIBNL="-lnl-tiny"
 endef
 
@@ -107,9 +108,9 @@ define Build/InstallDev
 	$(CP) $(PKG_BUILD_DIR)/kernel/linux $(1)/usr/include/wprobe
 endef
 
-define Package/wprobe-info/install
+define Package/wprobe-util/install
 	$(INSTALL_DIR) $(1)/sbin
-	$(INSTALL_BIN) $(PKG_BUILD_DIR)/user/wprobe-info $(1)/sbin/
+	$(INSTALL_BIN) $(PKG_BUILD_DIR)/user/wprobe-util $(1)/sbin/
 endef
 
 define Package/wprobe-export/install
@@ -120,5 +121,5 @@ define Package/wprobe-export/install
 endef
 
 $(eval $(call KernelPackage,wprobe))
-$(eval $(call BuildPackage,wprobe-info))
+$(eval $(call BuildPackage,wprobe-util))
 $(eval $(call BuildPackage,wprobe-export))
diff --git a/package/wprobe/src/Makefile.inc b/package/wprobe/src/Makefile.inc
new file mode 100644
index 0000000..05a2dd9
--- /dev/null
+++ b/package/wprobe/src/Makefile.inc
@@ -0,0 +1,12 @@
+HOST_OS=$(shell uname)
+
+CC=gcc
+AR=ar
+RANLIB=ranlib
+
+WFLAGS = -Wall -Werror
+CFLAGS?=-O2
+CPPFLAGS=
+LDFLAGS=
+LIBS=
+
diff --git a/package/wprobe/src/exporter/Makefile b/package/wprobe/src/exporter/Makefile
index c8e489a..9f81507 100644
--- a/package/wprobe/src/exporter/Makefile
+++ b/package/wprobe/src/exporter/Makefile
@@ -1,2 +1,5 @@
+include ../Makefile.inc
+CPPFLAGS += -I../kernel -I../user
+
 wprobe-export: wprobe-export.c
 	$(CC) $(CPPFLAGS) $(CFLAGS) -o $@ $^ $(LDFLAGS) $(LIBS)
diff --git a/package/wprobe/src/exporter/wprobe-export.c b/package/wprobe/src/exporter/wprobe-export.c
index fa32e8b..b092606 100644
--- a/package/wprobe/src/exporter/wprobe-export.c
+++ b/package/wprobe/src/exporter/wprobe-export.c
@@ -252,7 +252,7 @@ int main ( int argc, char **argv )
 		return -1;
 	}
 
-	dev = wprobe_get_dev(ifname);
+	dev = wprobe_get_auto(ifname);
 	if (!dev || (list_empty(&dev->global_attr) && list_empty(&dev->link_attr))) {
 		fprintf(stderr, "Cannot connect to wprobe on interface '%s'\n", ifname);
 		return -1;
diff --git a/package/wprobe/src/filter/README.txt b/package/wprobe/src/filter/README.txt
new file mode 100644
index 0000000..6fa265e
--- /dev/null
+++ b/package/wprobe/src/filter/README.txt
@@ -0,0 +1 @@
+To compile pfc you need at least libpcap version 1.0, as it requires proper radiotap header support
diff --git a/package/wprobe/src/filter/gen_filter.pl b/package/wprobe/src/filter/gen_filter.pl
new file mode 100755
index 0000000..f03f477
--- /dev/null
+++ b/package/wprobe/src/filter/gen_filter.pl
@@ -0,0 +1,63 @@
+#!/usr/bin/perl
+use strict;
+
+# helpers for custom packet format
+# bytes 0-7 are used by a dummy radiotap header
+my $WLAN_LEN = "radio[8:2]";
+my $SNR = "radio[10:1]";
+my $DEFAULT = undef;
+
+my $MAGIC = "WPFF";
+my $VERSION = 1; # filter binary format version
+my $HDRLEN = 3; # assumed storage space for custom fields
+
+my $output = "filter.bin";
+my $config = {
+	"packetsize" => [
+		[ "small", "$WLAN_LEN < 250" ],
+		[ "medium", "$WLAN_LEN < 800" ],
+		[ "big", $DEFAULT ],
+	],
+	"snr" => [
+		[ "low", "$SNR < 10" ],
+		[ "medium", "$SNR < 20" ],
+		[ "high", $DEFAULT ],
+	],
+	"type" => [
+		[ "beacon", "type mgt subtype beacon" ],
+		[ "data", "type data subtype data" ],
+		[ "qosdata", "type data subtype qos-data" ],
+		[ "other", "$DEFAULT" ]
+	]
+};
+
+sub escape_q($) {
+	my $str = shift;
+	$str =~ s/'/'\\''/g;
+	return $str;
+}
+
+my $GROUPS = scalar(keys %$config);
+open OUTPUT, ">$output" or die "Cannot open output file: $!\n";
+print OUTPUT pack("a4CCn", $MAGIC, $VERSION, $HDRLEN, $GROUPS);
+
+foreach my $groupname (keys %$config) {
+	my $default = 0;
+	my $group = $config->{$groupname};
+	print OUTPUT pack("a32N", $groupname, scalar(@$group));
+	foreach my $filter (@$group) {
+		if (!$filter->[1]) {
+			$default > 0 and print "Cannot add more than one default filter per group: $groupname -> ".$filter->[0]."\n";
+			print OUTPUT pack("a32N", $filter->[0], 0);
+			$default++;
+		} else {
+			open FILTER, "./pfc '".escape_q($filter->[0])."' '".escape_q($filter->[1])."' |"
+				or die "Failed to run filter command for '".$filter->[0]."': $!\n";
+			while (<FILTER>) {
+				print OUTPUT $_;
+			}
+			close FILTER;
+			$? and die "Filter '".$filter->[0]."' did not compile.\n";
+		}
+	}
+}
diff --git a/package/wprobe/src/filter/pfc.c b/package/wprobe/src/filter/pfc.c
new file mode 100644
index 0000000..76fb141
--- /dev/null
+++ b/package/wprobe/src/filter/pfc.c
@@ -0,0 +1,58 @@
+#include <arpa/inet.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <string.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#include <pcap.h>
+#include <pcap-bpf.h>
+
+struct wprobe_filter_hdr {
+	char name[32];
+	uint32_t len;
+} hdr;
+
+int main (int argc, char ** argv)
+{
+    struct  bpf_program filter;
+    pcap_t  *pc;
+	int i;
+
+    if (argc != 3)
+    {
+		fprintf(stderr, "Usage: %s <name> <expression>\n", argv[0]);
+		return 1;
+    }
+
+    pc = pcap_open_dead(DLT_IEEE802_11_RADIO, 256);
+    if (pcap_compile(pc, &filter, argv[2], 1, 0) != 0)
+	{
+		pcap_perror(pc, argv[0]);
+		exit(1);
+	}
+
+	/* fix up for linux */
+	for (i = 0; i < filter.bf_len; i++) {
+		struct bpf_insn *bi = &filter.bf_insns[i];
+		switch(BPF_CLASS(bi->code)) {
+		case BPF_RET:
+			if (BPF_MODE(bi->code) == BPF_K) {
+				if (bi->k != 0)
+					bi->k = 65535;
+			}
+			break;
+		}
+		bi->code = ntohs(bi->code);
+		bi->k = ntohl(bi->k);
+	}
+
+	memset(&hdr, 0, sizeof(hdr));
+	strncpy(hdr.name, argv[1], sizeof(hdr.name));
+	hdr.len = htonl(filter.bf_len);
+	fwrite(&hdr, sizeof(hdr), 1, stdout);
+	fwrite(filter.bf_insns, 8, filter.bf_len, stdout);
+	fflush(stdout);
+
+    return 0;
+}
diff --git a/package/wprobe/src/kernel/linux/wprobe.h b/package/wprobe/src/kernel/linux/wprobe.h
index 9536a92..901daf3 100644
--- a/package/wprobe/src/kernel/linux/wprobe.h
+++ b/package/wprobe/src/kernel/linux/wprobe.h
@@ -23,6 +23,7 @@
 #include <linux/module.h>
 #include <linux/list.h>
 #include <linux/timer.h>
+#include <linux/filter.h>
 #include <net/genetlink.h>
 #endif
 
@@ -103,6 +104,11 @@ enum wprobe_attr {
 	WPROBE_ATTR_SAMPLES_MAX,
 	WPROBE_ATTR_SAMPLES_SCALE_M,
 	WPROBE_ATTR_SAMPLES_SCALE_D,
+	WPROBE_ATTR_FILTER,
+
+	WPROBE_ATTR_FILTER_GROUP,
+	WPROBE_ATTR_RXCOUNT,
+	WPROBE_ATTR_TXCOUNT,
 
 	WPROBE_ATTR_LAST
 };
@@ -118,6 +124,8 @@ enum wprobe_attr {
  * @WPROBE_CMD_SET_FLAGS: set global/link flags
  * @WPROBE_CMD_MEASURE: take a snapshot of the current data
  * @WPROBE_CMD_GET_LINKS: get a list of links
+ * @WPROBE_CMD_CONFIG: set config options
+ * @WPROBE_CMD_GET_FILTER: get counters for active filters
  *
  * @WPROBE_CMD_LAST: unused
  * 
@@ -133,13 +141,14 @@ enum wprobe_cmd {
 	WPROBE_CMD_MEASURE,
 	WPROBE_CMD_GET_LINKS,
 	WPROBE_CMD_CONFIG,
+	WPROBE_CMD_GET_FILTER,
 	WPROBE_CMD_LAST
 };
 
 /**
  * enum wprobe_flags: flags for wprobe links and items
  * @WPROBE_F_KEEPSTAT: keep statistics for this link/device
- * @WPROBE_F_RESET: reset statistics now (used only in WPROBE_CMD_SET_LINK)
+ * @WPROBE_F_RESET: reset statistics now
  * @WPROBE_F_NEWDATA: used to indicate that a value has been updated
  */
 enum wprobe_flags {
@@ -153,6 +162,7 @@ enum wprobe_flags {
 struct wprobe_link;
 struct wprobe_item;
 struct wprobe_source;
+struct wprobe_value;
 
 /**
  * struct wprobe_link - data structure describing a wireless link
@@ -170,7 +180,7 @@ struct wprobe_link {
 	char addr[ETH_ALEN];
 	u32 flags;
 	void *priv;
-	void *val;
+	struct wprobe_value *val;
 };
 
 /** 
@@ -211,6 +221,58 @@ struct wprobe_value {
 	u64 scale_timestamp;
 };
 
+struct wprobe_filter_item_hdr {
+	char name[32];
+	__be32 n_items;
+} __attribute__((packed));
+
+struct wprobe_filter_item {
+	struct wprobe_filter_item_hdr hdr;
+	struct sock_filter filter[];
+} __attribute__((packed));
+
+struct wprobe_filter_counter {
+	u64 tx;
+	u64 rx;
+};
+
+struct wprobe_filter_group {
+	const char *name;
+	int n_items;
+	struct wprobe_filter_item **items;
+	struct wprobe_filter_counter *counters;
+};
+
+struct wprobe_filter_hdr {
+	__u8 magic[4];
+	__u8 version;
+	__u8 hdrlen;
+	__u16 n_groups;
+} __attribute__((packed));
+
+struct wprobe_filter {
+	spinlock_t lock;
+	struct sk_buff *skb;
+	void *data;
+	int n_groups;
+	int hdrlen;
+	struct wprobe_filter_item **items;
+	struct wprobe_filter_counter *counters;
+	struct wprobe_filter_group groups[];
+};
+
+enum {
+	WPROBE_PKT_RX = 0x00,
+	WPROBE_PKT_TX = 0x10,
+};
+
+struct wprobe_wlan_hdr {
+	u16 len;
+	u8 snr;
+	u8 type;
+} __attribute__((packed));
+
+
 /**
  * struct wprobe_source - data structure describing a wireless interface
  *
@@ -250,8 +312,9 @@ struct wprobe_iface {
 	struct list_head list;
 	struct list_head links;
 	spinlock_t lock;
-	void *val;
-	void *query_val;
+	struct wprobe_value *val;
+	struct wprobe_value *query_val;
+	struct wprobe_filter *active_filter;
 
 	u32 measure_interval;
 	struct timer_list measure_timer;
@@ -262,6 +325,7 @@ struct wprobe_iface {
 	u32 scale_d;
 };
 
+
 #define WPROBE_FILL_BEGIN(_ptr, _list) do {			\
 	struct wprobe_value *__val = (_ptr);			\
 	const struct wprobe_item *__item = _list;		\
@@ -319,6 +383,15 @@ extern void __weak wprobe_remove_link(struct wprobe_iface *dev, struct wprobe_li
  */
 extern void __weak wprobe_update_stats(struct wprobe_iface *dev, struct wprobe_link *l);
 
+/**
+ * wprobe_add_frame: add frame for layer 2 analysis
+ * @dev: wprobe_iface structure describing the interface
+ * @hdr: metadata for the frame
+ * @data: 802.11 header pointer
+ * @len: length of the 802.11 header
+ */
+extern int __weak wprobe_add_frame(struct wprobe_iface *dev, const struct wprobe_wlan_hdr *hdr, void *data, int len);
+
 #endif /* __KERNEL__ */
 
 #endif
diff --git a/package/wprobe/src/kernel/wprobe-core.c b/package/wprobe/src/kernel/wprobe-core.c
index 51ee7bc..d8f5a16 100644
--- a/package/wprobe/src/kernel/wprobe-core.c
+++ b/package/wprobe/src/kernel/wprobe-core.c
@@ -35,6 +35,8 @@
 #endif
 
 #define WPROBE_MIN_INTERVAL		100 /* minimum measurement interval in msecs */
+#define WPROBE_MAX_FILTER_SIZE	1024
+#define WPROBE_MAX_FRAME_SIZE	1900
 
 static struct list_head wprobe_if;
 static spinlock_t wprobe_lock;
@@ -48,8 +50,17 @@ static struct genl_family wprobe_fam = {
 	.maxattr = WPROBE_ATTR_LAST,
 };
 
+/* fake radiotap header */
+struct wprobe_rtap_hdr {
+	__u8 version;
+	__u8 padding;
+	__le16 len;
+	__le32 present;
+};
+
 static void wprobe_update_stats(struct wprobe_iface *dev, struct wprobe_link *l);
 static int wprobe_sync_data(struct wprobe_iface *dev, struct wprobe_link *l, bool query);
+static void wprobe_free_filter(struct wprobe_filter *f);
 
 int
 wprobe_add_link(struct wprobe_iface *s, struct wprobe_link *l, const char *addr)
@@ -111,11 +122,11 @@ wprobe_add_iface(struct wprobe_iface *s)
 	INIT_LIST_HEAD(&s->links);
 	setup_timer(&s->measure_timer, wprobe_measure_timer, (unsigned long) s);
 
-	vsize = max(s->n_link_items, s->n_global_items);
-	s->val = kzalloc(sizeof(struct wprobe_value) * vsize, GFP_ATOMIC);
+	s->val = kzalloc(sizeof(struct wprobe_value) * s->n_global_items, GFP_ATOMIC);
 	if (!s->val)
 		goto error;
 
+	vsize = max(s->n_link_items, s->n_global_items);
 	s->query_val = kzalloc(sizeof(struct wprobe_value) * vsize, GFP_ATOMIC);
 	if (!s->query_val)
 		goto error;
@@ -160,6 +171,8 @@ wprobe_remove_iface(struct wprobe_iface *s)
 
 	kfree(s->val);
 	kfree(s->query_val);
+	if (s->active_filter)
+		wprobe_free_filter(s->active_filter);
 }
 EXPORT_SYMBOL(wprobe_remove_iface);
 
@@ -187,6 +200,69 @@ wprobe_get_dev(struct nlattr *attr)
 	return dev;
 }
 
+int
+wprobe_add_frame(struct wprobe_iface *dev, const struct wprobe_wlan_hdr *hdr, void *data, int len)
+{
+	struct wprobe_filter *f;
+	struct sk_buff *skb;
+	unsigned long flags;
+	int i, j;
+
+	rcu_read_lock();
+	f = rcu_dereference(dev->active_filter);
+	if (!f)
+		goto out;
+
+	spin_lock_irqsave(&f->lock, flags);
+
+	skb = f->skb;
+	skb->len = sizeof(struct wprobe_rtap_hdr);
+	skb->tail = skb->data + skb->len;
+	if (len + skb->len > WPROBE_MAX_FRAME_SIZE)
+		len = WPROBE_MAX_FRAME_SIZE - skb->len;
+
+	memcpy(skb_put(skb, f->hdrlen), hdr, sizeof(struct wprobe_wlan_hdr));
+	memcpy(skb_put(skb, len), data, len);
+
+	for(i = 0; i < f->n_groups; i++) {
+		struct wprobe_filter_group *fg = &f->groups[i];
+		bool found = false;
+		int def = -1;
+
+		for (j = 0; j < fg->n_items; j++) {
+			struct wprobe_filter_item *fi = fg->items[j];
+
+			if (!fi->hdr.n_items) {
+				def = j;
+				continue;
+			}
+			if (sk_run_filter(skb, fi->filter, fi->hdr.n_items) == 0)
+				continue;
+
+			found = true;
+			break;
+		}
+		if (!found && def >= 0) {
+			j = def;
+			found = true;
+		}
+		if (found) {
+			struct wprobe_filter_counter *c = &fg->counters[j];
+
+			if (hdr->type >= WPROBE_PKT_TX)
+				c->tx++;
+			else
+				c->rx++;
+		}
+	}
+
+	spin_unlock_irqrestore(&f->lock, flags);
+out:
+	rcu_read_unlock();
+	return 0;
+}
+EXPORT_SYMBOL(wprobe_add_frame);
+
 static int
 wprobe_sync_data(struct wprobe_iface *dev, struct wprobe_link *l, bool query)
 {
@@ -325,6 +401,7 @@ static const struct nla_policy wprobe_policy[WPROBE_ATTR_LAST+1] = {
 	[WPROBE_ATTR_SAMPLES_MAX] = { .type = NLA_U32 },
 	[WPROBE_ATTR_SAMPLES_SCALE_M] = { .type = NLA_U32 },
 	[WPROBE_ATTR_SAMPLES_SCALE_D] = { .type = NLA_U32 },
+	[WPROBE_ATTR_FILTER] = { .type = NLA_BINARY, .len = 32768 },
 };
 
 static bool
@@ -438,6 +515,86 @@ wprobe_find_link(struct wprobe_iface *dev, const char *mac)
 }
 
 static bool
+wprobe_dump_filter_group(struct sk_buff *msg, struct wprobe_filter_group *fg, struct netlink_callback *cb)
+{
+	struct genlmsghdr *hdr;
+	struct nlattr *group, *item;
+	int i;
+
+	hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq,
+			&wprobe_fam, NLM_F_MULTI, WPROBE_CMD_GET_FILTER);
+	if (!hdr)
+		return false;
+
+	NLA_PUT_STRING(msg, WPROBE_ATTR_NAME, fg->name);
+	group = nla_nest_start(msg, WPROBE_ATTR_FILTER_GROUP);
+	for (i = 0; i < fg->n_items; i++) {
+		struct wprobe_filter_item *fi = fg->items[i];
+		struct wprobe_filter_counter *fc = &fg->counters[i];
+
+		item = nla_nest_start(msg, WPROBE_ATTR_FILTER_GROUP);
+		NLA_PUT_STRING(msg, WPROBE_ATTR_NAME, fi->hdr.name);
+		NLA_PUT_U64(msg, WPROBE_ATTR_RXCOUNT, fc->rx);
+		NLA_PUT_U64(msg, WPROBE_ATTR_TXCOUNT, fc->tx);
+		nla_nest_end(msg, item);
+	}
+
+	nla_nest_end(msg, group);
+	genlmsg_end(msg, hdr);
+	return true;
+
+nla_put_failure:
+	genlmsg_cancel(msg, hdr);
+	return false;
+}
+
+static int
+wprobe_dump_filters(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	struct wprobe_iface *dev = (struct wprobe_iface *)cb->args[0];
+	struct wprobe_filter *f;
+	int err = 0;
+	int i = 0;
+
+	if (!dev) {
+		err = nlmsg_parse(cb->nlh, GENL_HDRLEN + wprobe_fam.hdrsize,
+				wprobe_fam.attrbuf, wprobe_fam.maxattr, wprobe_policy);
+		if (err)
+			goto done;
+
+		dev = wprobe_get_dev(wprobe_fam.attrbuf[WPROBE_ATTR_INTERFACE]);
+		if (!dev) {
+			err = -ENODEV;
+			goto done;
+		}
+
+		cb->args[0] = (long) dev;
+		cb->args[1] = 0;
+	} else {
+		if (!wprobe_check_ptr(&wprobe_if, &dev->list)) {
+			err = -ENODEV;
+			goto done;
+		}
+	}
+
+	rcu_read_lock();
+	f = rcu_dereference(dev->active_filter);
+	if (!f)
+		goto abort;
+
+	for (i = cb->args[1]; i < f->n_groups; i++) {
+		if (unlikely(!wprobe_dump_filter_group(skb, &f->groups[i], cb)))
+			break;
+	}
+	cb->args[1] = i;
+abort:
+	rcu_read_unlock();
+	err = skb->len;
+done:
+	return err;
+}
+
+static bool
 wprobe_dump_link(struct sk_buff *msg, struct wprobe_link *l, struct netlink_callback *cb)
 {
 	struct genlmsghdr *hdr;
@@ -671,6 +828,158 @@ done:
 }
 
 static int
+wprobe_check_filter(void *data, int datalen, int gs)
+{
+	struct wprobe_filter_item_hdr *hdr;
+	void *orig_data = data;
+	void *end = data + datalen;
+	int i, j, k, is, cur_is;
+
+	for (i = j = is = 0; i < gs; i++) {
+		hdr = data;
+		data += sizeof(*hdr);
+
+		if (data > end)
+			goto overrun;
+
+		hdr->name[31] = 0;
+		cur_is = be32_to_cpu(hdr->n_items);
+		is += cur_is;
+		for (j = 0; j < cur_is; j++) {
+			struct sock_filter *sf;
+			int n_items;
+
+			hdr = data;
+			data += sizeof(*hdr);
+			if (data > end)
+				goto overrun;
+
+			if (hdr->n_items > 1024)
+				goto overrun;
+
+			hdr->name[31] = 0;
+			hdr->n_items = n_items = be32_to_cpu(hdr->n_items);
+			sf = data;
+			if (n_items > 0) {
+				for (k = 0; k < n_items; k++) {
+					sf->code = be16_to_cpu(sf->code);
+					sf->k = be32_to_cpu(sf->k);
+					sf++;
+				}
+				if (sk_chk_filter(data, n_items) != 0) {
+					printk("%s: filter check failed at group %d, item %d\n", __func__, i, j);
+					return 0;
+				}
+			}
+			data += n_items * sizeof(struct sock_filter);
+		}
+	}
+	return is;
+
+overrun:
+	printk(KERN_ERR "%s: overrun during filter check at group %d, item %d, offset=%d, len=%d\n", __func__, i, j, (data - orig_data), datalen);
+	return 0;
+}
+
+static void
+wprobe_free_filter(struct wprobe_filter *f)
+{
+	if (f->skb)
+		kfree_skb(f->skb);
+	if (f->data)
+		kfree(f->data);
+	if (f->items)
+		kfree(f->items);
+	if (f->counters)
+		kfree(f->counters);
+	kfree(f);
+}
+
+
+static int
+wprobe_set_filter(struct wprobe_iface *dev, void *data, int len)
+{
+	struct wprobe_filter_hdr *fhdr;
+	struct wprobe_rtap_hdr *rtap;
+	struct wprobe_filter *f;
+	int i, j, cur_is, is, gs;
+
+	if (len < sizeof(*fhdr))
+		return -EINVAL;
+
+	fhdr = data;
+	data += sizeof(*fhdr);
+	len -= sizeof(*fhdr);
+
+	if (memcmp(fhdr->magic, "WPFF", 4) != 0) {
+		printk(KERN_ERR "%s: filter rejected (invalid magic)\n", __func__);
+		return -EINVAL;
+	}
+
+	gs = be16_to_cpu(fhdr->n_groups);
+	is = wprobe_check_filter(data, len, gs);
+	if (is == 0)
+		return -EINVAL;
+
+	f = kzalloc(sizeof(struct wprobe_filter) +
+		gs * sizeof(struct wprobe_filter_group), GFP_ATOMIC);
+	if (!f)
+		return -ENOMEM;
+
+	f->skb = alloc_skb(WPROBE_MAX_FRAME_SIZE, GFP_ATOMIC);
+	if (!f->skb)
+		goto error;
+
+	f->data = kmalloc(len, GFP_ATOMIC);
+	if (!f->data)
+		goto error;
+
+	f->items = kzalloc(sizeof(struct wprobe_filter_item *) * is, GFP_ATOMIC);
+	if (!f->items)
+		goto error;
+
+	f->counters = kzalloc(sizeof(struct wprobe_filter_counter) * is, GFP_ATOMIC);
+	if (!f->counters)
+		goto error;
+
+	spin_lock_init(&f->lock);
+	memcpy(f->data, data, len);
+	f->n_groups = gs;
+
+	if (f->hdrlen < sizeof(struct wprobe_wlan_hdr))
+		f->hdrlen = sizeof(struct wprobe_wlan_hdr);
+
+	rtap = (struct wprobe_rtap_hdr *)skb_put(f->skb, sizeof(*rtap));
+	memset(rtap, 0, sizeof(*rtap));
+	rtap->len = cpu_to_le16(sizeof(struct wprobe_rtap_hdr) + f->hdrlen);
+	data = f->data;
+
+	cur_is = 0;
+	for (i = 0; i < gs; i++) {
+		struct wprobe_filter_item_hdr *hdr = data;
+		struct wprobe_filter_group *g = &f->groups[i];
+
+		data += sizeof(*hdr);
+		g->name = hdr->name;
+		g->items = &f->items[cur_is];
+		g->counters = &f->counters[cur_is];
+		g->n_items = hdr->n_items;
+
+		for (j = 0; j < g->n_items; j++) {
+			hdr = data;
+			f->items[cur_is++] = data;
+			data += sizeof(*hdr) + be32_to_cpu(hdr->n_items) * sizeof(struct sock_filter);
+		}
+	}
+	rcu_assign_pointer(dev->active_filter, f);
+	return 0;
+
+error:
+	wprobe_free_filter(f);
+	return -ENOMEM;
+}
+
+static int
 wprobe_set_config(struct sk_buff *skb, struct genl_info *info)
 {
 	struct wprobe_iface *dev;
@@ -678,6 +987,8 @@ wprobe_set_config(struct sk_buff *skb, struct genl_info *info)
 	int err = -ENOENT;
 	u32 scale_min, scale_max;
 	u32 scale_m, scale_d;
+	struct nlattr *attr;
+	struct wprobe_filter *filter_free = NULL;
 
 	rcu_read_lock();
 	dev = wprobe_get_dev(info->attrs[WPROBE_ATTR_INTERFACE]);
@@ -691,15 +1002,28 @@ wprobe_set_config(struct sk_buff *skb, struct genl_info *info)
 		goto done;
 	}
 
+	if (info->attrs[WPROBE_ATTR_FLAGS]) {
+		u32 flags = nla_get_u32(info->attrs[WPROBE_ATTR_FLAGS]);
+
+		if (flags & BIT(WPROBE_F_RESET)) {
+			struct wprobe_link *l;
+
+			memset(dev->val, 0, sizeof(struct wprobe_value) * dev->n_global_items);
+			list_for_each_entry_rcu(l, &dev->links, list) {
+				memset(l->val, 0, sizeof(struct wprobe_value) * dev->n_link_items);
+			}
+		}
+	}
+
 	if (info->attrs[WPROBE_ATTR_SAMPLES_MIN] ||
 		info->attrs[WPROBE_ATTR_SAMPLES_MAX]) {
-		if (info->attrs[WPROBE_ATTR_SAMPLES_MIN])
-			scale_min = nla_get_u32(info->attrs[WPROBE_ATTR_SAMPLES_MIN]);
+		if ((attr = info->attrs[WPROBE_ATTR_SAMPLES_MIN]))
+			scale_min = nla_get_u32(attr);
 		else
 			scale_min = dev->scale_min;
 
-		if (info->attrs[WPROBE_ATTR_SAMPLES_MAX])
-			scale_max = nla_get_u32(info->attrs[WPROBE_ATTR_SAMPLES_MAX]);
+		if ((attr = info->attrs[WPROBE_ATTR_SAMPLES_MAX]))
+			scale_max = nla_get_u32(attr);
 		else
 			scale_max = dev->scale_max;
 
@@ -725,6 +1049,13 @@ wprobe_set_config(struct sk_buff *skb, struct genl_info *info)
 		dev->scale_d = scale_d;
 	}
 
+	if ((attr = info->attrs[WPROBE_ATTR_FILTER])) {
+		filter_free = rcu_dereference(dev->active_filter);
+		rcu_assign_pointer(dev->active_filter, NULL);
+		if (nla_len(attr) > 0)
+			wprobe_set_filter(dev, nla_data(attr), nla_len(attr));
+	}
+
 	err = 0;
 	if (info->attrs[WPROBE_ATTR_INTERVAL]) {
 		/* change of measurement interval requested */
@@ -736,6 +1067,10 @@ done:
 	spin_unlock_irqrestore(&dev->lock, flags);
 done_unlocked:
 	rcu_read_unlock();
+	if (filter_free) {
+		synchronize_rcu();
+		wprobe_free_filter(filter_free);
+	}
 	return err;
 }
 
@@ -763,6 +1098,12 @@ static struct genl_ops wprobe_ops[] = {
 	{
 		.cmd = WPROBE_CMD_CONFIG,
 		.doit = wprobe_set_config,
+		.policy = wprobe_policy,
+	},
+	{
+		.cmd = WPROBE_CMD_GET_FILTER,
+		.dumpit = wprobe_dump_filters,
+		.policy = wprobe_policy,
 	},
 };
 
diff --git a/package/wprobe/src/user/Makefile b/package/wprobe/src/user/Makefile
index e10dfc0..01e83da 100644
--- a/package/wprobe/src/user/Makefile
+++ b/package/wprobe/src/user/Makefile
@@ -1,21 +1,38 @@
-CFLAGS = -O2
-CPPFLAGS ?= -I../kernel
-WFLAGS = -Wall -Werror
+include ../Makefile.inc
+
+CPPFLAGS += -I../kernel
 LDFLAGS =
 
+ifneq ($(HOST_OS),Linux)
+USE_LIBNL_MICRO=1
+else
+USE_LIBNL_MICRO=
+endif
+
+ifeq ($(USE_LIBNL_MICRO),1)
+LIBNL_PREFIX = /usr/local
+LIBNL = $(LIBNL_PREFIX)/lib/libnl-micro.a
+CPPFLAGS += -I$(LIBNL_PREFIX)/include/libnl-micro
+EXTRA_CFLAGS += -DNO_LOCAL_ACCESS
+else
 LIBNL = -lnl
+endif
+
 LIBM = -lm
 LIBS = $(LIBNL) $(LIBM)
 
-all: libwprobe.a wprobe-info
+all: libwprobe.a wprobe-util
 
-libwprobe.a: wprobe.o
+libwprobe.a: wprobe-lib.o
 	rm -f $@
 	$(AR) rcu $@ $^
 	$(RANLIB) $@
 
 %.o: %.c
-	$(CC) $(WFLAGS) -c -o $@ $(CPPFLAGS) $(CFLAGS) $<
+	$(CC) $(WFLAGS) -c -o $@ $(CPPFLAGS) $(CFLAGS) $(EXTRA_CFLAGS) $<
 
-wprobe-info: wprobe-info.o wprobe.o
+wprobe-util: wprobe-util.o wprobe-lib.o
 	$(CC) -o $@ $^ $(LDFLAGS) $(LIBS)
+
+clean:
+	rm -f *.o *.a wprobe-util
diff --git a/package/wprobe/src/user/wprobe-info.c b/package/wprobe/src/user/wprobe-info.c
deleted file mode 100644
index 8361c02..0000000
--- a/package/wprobe/src/user/wprobe-info.c
+++ /dev/null
@@ -1,210 +0,0 @@
-/*
- * wprobe-test.c: Wireless probe user space test code
- * Copyright (C) 2008-2009 Felix Fietkau <nbd@openwrt.org>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
-
-#include <stdio.h>
-#include <string.h>
-#include <stdlib.h>
-#include <inttypes.h>
-#include <errno.h>
-#include <stdint.h>
-#include <getopt.h>
-#include <stdbool.h>
-#include <unistd.h>
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <linux/wprobe.h>
-#include "wprobe.h"
-
-static const char *
-wprobe_dump_value(struct wprobe_attribute *attr)
-{
-	static char buf[128];
-
-#define HANDLE_TYPE(_type, _format) \
-	case WPROBE_VAL_##_type: \
-		snprintf(buf, sizeof(buf), _format, attr->val._type); \
-		break
-
-	switch(attr->type) {
-		HANDLE_TYPE(S8, "%d");
-		HANDLE_TYPE(S16, "%d");
-		HANDLE_TYPE(S32, "%d");
-		HANDLE_TYPE(S64, "%lld");
-		HANDLE_TYPE(U8, "%d");
-		HANDLE_TYPE(U16, "%d");
-		HANDLE_TYPE(U32, "%d");
-		HANDLE_TYPE(U64, "%lld");
-		case WPROBE_VAL_STRING:
-			/* FIXME: implement this */
-		default:
-			strncpy(buf, "<unknown>", sizeof(buf));
-			break;
-	}
-	if ((attr->flags & WPROBE_F_KEEPSTAT) &&
-		(attr->val.n > 0)) {
-		int len = strlen(buf);
-		snprintf(buf + len, sizeof(buf) - len, " (avg: %.02f; stdev: %.02f, n=%d)", attr->val.avg, attr->val.stdev, attr->val.n);
-	}
-#undef HANDLE_TYPE
-
-	return buf;
-}
-
-
-static void
-wprobe_dump_data(struct wprobe_iface *dev)
-{
-	struct wprobe_attribute *attr;
-	struct wprobe_link *link;
-	bool first = true;
-
-	fprintf(stderr, "\n");
-	wprobe_request_data(dev, NULL);
-	list_for_each_entry(attr, &dev->global_attr, list) {
-		fprintf(stderr, (first ?
-			"Global:            %s=%s\n" :
-			"                   %s=%s\n"),
-			attr->name,
-			wprobe_dump_value(attr)
-		);
-		first = false;
-	}
-
-	list_for_each_entry(link, &dev->links, list) {
-		first = true;
-		wprobe_request_data(dev, link->addr);
-		list_for_each_entry(attr, &dev->link_attr, list) {
-			if (first) {
-				fprintf(stderr,
-					"%02x:%02x:%02x:%02x:%02x:%02x: %s=%s\n",
-					link->addr[0], link->addr[1], link->addr[2],
-					link->addr[3], link->addr[4], link->addr[5],
-					attr->name,
-					wprobe_dump_value(attr));
-				first = false;
-			} else {
-				fprintf(stderr,
-					"                   %s=%s\n",
-					attr->name,
-					wprobe_dump_value(attr));
-			}
-		}
-	}
-}
-
-static const char *attr_typestr[] = {
-	[0] = "Unknown",
-	[WPROBE_VAL_STRING] = "String",
-	[WPROBE_VAL_U8] = "Unsigned 8 bit",
-	[WPROBE_VAL_U16] = "Unsigned 16 bit",
-	[WPROBE_VAL_U32] = "Unsigned 32 bit",
-	[WPROBE_VAL_U64] = "Unsigned 64 bit",
-	[WPROBE_VAL_S8] = "Signed 8 bit",
-	[WPROBE_VAL_S16] = "Signed 16 bit",
-	[WPROBE_VAL_S32] = "Signed 32 bit",
-	[WPROBE_VAL_S64] = "Signed 64 bit",
-};
-
-static int usage(const char *prog)
-{
-	fprintf(stderr,
-		"Usage: %s <interface> [options]\n"
-		"\n"
-		"Options:\n"
-		"  -c:            Only apply configuration\n"
-		"  -h:            This help text\n"
-		"  -i <interval>: Set measurement interval\n"
-		"  -m:            Run measurement loop\n"
-		"\n"
-		, prog);
-	exit(1);
-}
-
-static void show_attributes(struct wprobe_iface *dev)
-{
-	struct wprobe_attribute *attr;
-	list_for_each_entry(attr, &dev->global_attr, list) {
-		fprintf(stderr, "Global attribute: '%s' (%s)\n",
-			attr->name, attr_typestr[attr->type]);
-	}
-	list_for_each_entry(attr, &dev->link_attr, list) {
-		fprintf(stderr, "Link attribute: '%s' (%s)\n",
-			attr->name, attr_typestr[attr->type]);
-	}
-}
-
-static void loop_measurement(struct wprobe_iface *dev)
-{
-	while (1) {
-		sleep(1);
-		wprobe_update_links(dev);
-		wprobe_dump_data(dev);
-	}
-}
-
-int main(int argc, char **argv)
-{
-	struct wprobe_iface *dev;
-	const char *ifname;
-	const char *prog = argv[0];
-	enum {
-		CMD_NONE,
-		CMD_CONFIG,
-		CMD_MEASURE,
-	} cmd = CMD_NONE;
-	int ch;
-
-	if ((argc < 2) || (argv[1][0] == '-'))
-		return usage(prog);
-
-	ifname = argv[1];
-	dev = wprobe_get_dev(ifname);
-	argv++;
-	argc--;
-
-	if (!dev || (list_empty(&dev->global_attr) &&
-		list_empty(&dev->link_attr))) {
-		fprintf(stderr, "Interface '%s' not found\n", ifname);
-		return -1;
-	}
-
-	while ((ch = getopt(argc, argv, "chi:m")) != -1) {
-		switch(ch) {
-		case 'c':
-			cmd = CMD_CONFIG;
-			break;
-		case 'm':
-			cmd = CMD_MEASURE;
-			break;
-		case 'i':
-			dev->interval = strtoul(optarg, NULL, 10);
-			break;
-		case 'h':
-		default:
-			usage(prog);
-			break;
-		}
-	}
-
-	wprobe_apply_config(dev);
-	if (cmd != CMD_CONFIG)
-		show_attributes(dev);
-	if (cmd == CMD_MEASURE)
-		loop_measurement(dev);
-
-	wprobe_free_dev(dev);
-
-	return 0;
-}
diff --git a/package/wprobe/src/user/wprobe-lib.c b/package/wprobe/src/user/wprobe-lib.c
new file mode 100644
index 0000000..a3b0fb5
--- /dev/null
+++ b/package/wprobe/src/user/wprobe-lib.c
@@ -0,0 +1,1203 @@
+/*
+ * wprobe.c: Wireless probe user space library
+ * Copyright (C) 2008-2009 Felix Fietkau <nbd@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <getopt.h>
+#include <unistd.h>
+#include <stdbool.h>
+#include <math.h>
+#include <linux/wprobe.h>
+#include <netlink/netlink.h>
+#include <netlink/attr.h>
+#include <netlink/genl/genl.h>
+#ifndef NO_LOCAL_ACCESS 
+#include <netlink/genl/ctrl.h>
+#include <netlink/genl/family.h>
+#include <endian.h>
+#endif
+#include "wprobe.h"
+
+#define DEBUG 1
+#ifdef DEBUG
+#define DPRINTF(fmt, ...) fprintf(stderr, "%s(%d): " fmt, __func__, __LINE__, ##__VA_ARGS__)
+#else
+#define DPRINTF(fmt, ...) do {} while (0)
+#endif
+
+#if defined(BYTE_ORDER) && !defined(__BYTE_ORDER)
+#define __LITTLE_ENDIAN LITTLE_ENDIAN
+#define __BIG_ENDIAN BIG_ENDIAN
+#define __BYTE_ORDER BYTE_ORDER
+#endif
+
+#ifndef __BYTE_ORDER
+#error Unknown endian type
+#endif
+
+#define WPROBE_MAX_MSGLEN	65536
+
+static inline __u16 __swab16(__u16 x)
+{
+	return x<<8 | x>>8;
+}
+
+static inline __u32 __swab32(__u32 x)
+{
+	return x<<24 | x>>24 |
+		(x & (__u32)0x0000ff00UL)<<8 |
+		(x & (__u32)0x00ff0000UL)>>8;
+}
+
+static inline __u64 __swab64(__u64 x)
+{
+	return x<<56 | x>>56 |
+		(x & (__u64)0x000000000000ff00ULL)<<40 |
+		(x & (__u64)0x0000000000ff0000ULL)<<24 |
+		(x & (__u64)0x00000000ff000000ULL)<< 8 |
+		(x & (__u64)0x000000ff00000000ULL)>> 8 |
+		(x & (__u64)0x0000ff0000000000ULL)>>24 |
+		(x & (__u64)0x00ff000000000000ULL)>>40;
+}
+
+
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+#define SWAP16(var) var = __swab16(var)
+#define SWAP32(var) var = __swab32(var)
+#define SWAP64(var) var = __swab64(var)
+#else
+#define SWAP16(var) do {} while(0)
+#define SWAP32(var) do {} while(0)
+#define SWAP64(var) do {} while(0)
+#endif
+
+int wprobe_port = 17990;
+static struct nlattr *tb[WPROBE_ATTR_LAST+1];
+static struct nla_policy attribute_policy[WPROBE_ATTR_LAST+1] = {
+	[WPROBE_ATTR_ID] = { .type = NLA_U32 },
+	[WPROBE_ATTR_MAC] = { .type = NLA_UNSPEC, .minlen = 6, .maxlen = 6 },
+	[WPROBE_ATTR_NAME] = { .type = NLA_STRING },
+	[WPROBE_ATTR_FLAGS] = { .type = NLA_U32 },
+	[WPROBE_ATTR_TYPE] = { .type = NLA_U8 },
+	[WPROBE_ATTR_FLAGS] = { .type = NLA_U32 },
+	[WPROBE_VAL_S8] = { .type = NLA_U8 },
+	[WPROBE_VAL_S16] = { .type = NLA_U16 },
+	[WPROBE_VAL_S32] = { .type = NLA_U32 },
+	[WPROBE_VAL_S64] = { .type = NLA_U64 },
+	[WPROBE_VAL_U8] = { .type = NLA_U8 },
+	[WPROBE_VAL_U16] = { .type = NLA_U16 },
+	[WPROBE_VAL_U32] = { .type = NLA_U32 },
+	[WPROBE_VAL_U64] = { .type = NLA_U64 },
+	[WPROBE_VAL_SUM] = { .type = NLA_U64 },
+	[WPROBE_VAL_SUM_SQ] = { .type = NLA_U64 },
+	[WPROBE_VAL_SAMPLES] = { .type = NLA_U32 },
+	[WPROBE_VAL_SCALE_TIME] = { .type = NLA_U64 },
+	[WPROBE_ATTR_INTERVAL] = { .type = NLA_U64 },
+	[WPROBE_ATTR_SAMPLES_MIN] = { .type = NLA_U32 },
+	[WPROBE_ATTR_SAMPLES_MAX] = { .type = NLA_U32 },
+	[WPROBE_ATTR_SAMPLES_SCALE_M] = { .type = NLA_U32 },
+	[WPROBE_ATTR_SAMPLES_SCALE_D] = { .type = NLA_U32 },
+	[WPROBE_ATTR_FILTER_GROUP] = { .type = NLA_NESTED },
+	[WPROBE_ATTR_RXCOUNT] = { .type = NLA_U64 },
+	[WPROBE_ATTR_TXCOUNT] = { .type = NLA_U64 },
+};
+
+typedef int (*wprobe_cb_t)(struct nl_msg *, void *);
+
+struct wprobe_iface_ops {
+	int (*send_msg)(struct wprobe_iface *dev, struct nl_msg *msg, wprobe_cb_t cb, void *arg);
+	void (*free)(struct wprobe_iface *dev);
+};
+
+struct wprobe_attr_cb {
+	struct list_head *list;
+	char *addr;
+};
+
+#define WPROBE_MAGIC_STR "WPROBE"
+struct wprobe_init_hdr {
+	struct {
+		char magic[sizeof(WPROBE_MAGIC_STR)];
+
+		/* protocol version */
+		uint8_t version;
+
+		/* extra header length (unused for now) */
+		uint16_t extra;
+	} pre __attribute__((packed));
+	union {
+		struct {
+			uint16_t genl_family;
+		} v0 __attribute__((packed));
+	};
+} __attribute__((packed));
+
+struct wprobe_msg_hdr {
+	__u16 status;
+	__u16 error;
+	__u32 len;
+};
+
+enum wprobe_resp_status {
+	WPROBE_MSG_DONE = 0,
+	WPROBE_MSG_DATA = 1,
+};
+
+static inline void
+wprobe_swap_msg_hdr(struct wprobe_msg_hdr *mhdr)
+{
+	SWAP16(mhdr->status);
+	SWAP16(mhdr->error);
+	SWAP32(mhdr->len);
+}
+
+static int
+save_attribute_handler(struct nl_msg *msg, void *arg)
+{
+	struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
+	const char *name = "N/A";
+	struct wprobe_attribute *attr;
+	int type = 0;
+	struct wprobe_attr_cb *cb = arg;
+
+	nla_parse(tb, WPROBE_ATTR_LAST, genlmsg_attrdata(gnlh, 0),
+			genlmsg_attrlen(gnlh, 0), attribute_policy);
+
+	if (tb[WPROBE_ATTR_NAME])
+		name = nla_data(tb[WPROBE_ATTR_NAME]);
+
+	attr = malloc(sizeof(struct wprobe_attribute) + strlen(name) + 1);
+	if (!attr)
+		return -1;
+
+	memset(attr, 0, sizeof(struct wprobe_attribute));
+
+	if (tb[WPROBE_ATTR_ID])
+		attr->id = nla_get_u32(tb[WPROBE_ATTR_ID]);
+
+	if (tb[WPROBE_ATTR_MAC] && cb->addr)
+		memcpy(cb->addr, nla_data(tb[WPROBE_ATTR_MAC]), 6);
+
+	if (tb[WPROBE_ATTR_FLAGS])
+		attr->flags = nla_get_u32(tb[WPROBE_ATTR_FLAGS]);
+
+	if (tb[WPROBE_ATTR_TYPE])
+		type = nla_get_u8(tb[WPROBE_ATTR_TYPE]);
+
+	if ((type < WPROBE_VAL_STRING) ||
+		(type > WPROBE_VAL_U64))
+		type = 0;
+
+	attr->type = type;
+	strcpy(attr->name, name);
+	INIT_LIST_HEAD(&attr->list);
+	list_add(&attr->list, cb->list);
+	return 0;
+}
+
+static struct nl_msg *
+wprobe_new_msg(struct wprobe_iface *dev, int cmd, bool dump)
+{
+	struct nl_msg *msg;
+	uint32_t flags = 0;
+
+	msg = nlmsg_alloc_size(65536);
+	if (!msg)
+		return NULL;
+
+	if (dump)
+		flags |= NLM_F_DUMP;
+
+	genlmsg_put(msg, 0, 0, dev->genl_family,
+			0, flags, cmd, 0);
+
+	NLA_PUT_STRING(msg, WPROBE_ATTR_INTERFACE, dev->ifname);
+nla_put_failure:
+	return msg;
+}
+
+
+static int
+dump_attributes(struct wprobe_iface *dev, bool link, struct list_head *list, char *addr)
+{
+	struct nl_msg *msg;
+	struct wprobe_attr_cb cb;
+
+	cb.list = list;
+	cb.addr = addr;
+	msg = wprobe_new_msg(dev, WPROBE_CMD_GET_LIST, true);
+	if (!msg)
+		return -ENOMEM;
+
+	if (link)
+		NLA_PUT(msg, WPROBE_ATTR_MAC, 6, "\x00\x00\x00\x00\x00\x00");
+
+	return dev->ops->send_msg(dev, msg, save_attribute_handler, &cb);
+
+nla_put_failure:
+	nlmsg_free(msg);
+	return -EINVAL;
+}
+
+static struct wprobe_iface *
+wprobe_alloc_dev(void)
+{
+	struct wprobe_iface *dev;
+
+	dev = malloc(sizeof(struct wprobe_iface));
+	if (!dev)
+		return NULL;
+
+	memset(dev, 0, sizeof(struct wprobe_iface));
+
+	dev->interval = -1;
+	dev->scale_min = -1;
+	dev->scale_max = -1;
+	dev->scale_m = -1;
+	dev->scale_d = -1;
+	dev->sockfd = -1;
+
+	INIT_LIST_HEAD(&dev->global_attr);
+	INIT_LIST_HEAD(&dev->link_attr);
+	INIT_LIST_HEAD(&dev->links);
+	return dev;
+}
+
+static int
+wprobe_init_dev(struct wprobe_iface *dev)
+{
+	dump_attributes(dev, false, &dev->global_attr, NULL);
+	dump_attributes(dev, true, &dev->link_attr, NULL);
+	return 0;
+}
+
+#ifndef NO_LOCAL_ACCESS 
+static int n_devs = 0;
+static struct nl_sock *handle = NULL;
+static struct nl_cache *cache = NULL;
+static struct genl_family *family = NULL;
+
+static int
+error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
+{
+	int *ret = arg;
+	*ret = err->error;
+	return NL_STOP;
+}
+
+static int
+finish_handler(struct nl_msg *msg, void *arg)
+{
+	int *ret = arg;
+	*ret = 0;
+	return NL_SKIP;
+}
+
+static int
+ack_handler(struct nl_msg *msg, void *arg)
+{
+	int *ret = arg;
+	*ret = 0;
+	return NL_STOP;
+}
+
+static void
+wprobe_local_free(struct wprobe_iface *dev)
+{
+	/* should not happen */
+	if (n_devs == 0)
+		return;
+
+	if (--n_devs != 0)
+		return;
+
+	if (cache)
+		nl_cache_free(cache);
+	if (handle)
+		nl_socket_free(handle);
+	handle = NULL;
+	cache = NULL;
+}
+
+static int
+wprobe_local_init(void)
+{
+	int ret;
+
+	if (n_devs++ > 0)
+		return 0;
+
+	handle = nl_socket_alloc();
+	if (!handle) {
+		DPRINTF("Failed to create handle\n");
+		goto err;
+	}
+
+	if (genl_connect(handle)) {
+		DPRINTF("Failed to connect to generic netlink\n");
+		goto err;
+	}
+
+	ret = genl_ctrl_alloc_cache(handle, &cache);
+	if (ret < 0) {
+		DPRINTF("Failed to allocate netlink cache\n");
+		goto err;
+	}
+
+	family = genl_ctrl_search_by_name(cache, "wprobe");
+	if (!family) {
+		DPRINTF("wprobe API not present\n");
+		goto err;
+	}
+	return 0;
+
+err:
+	wprobe_local_free(NULL);
+	return -EINVAL;
+}
+
+
+static int
+wprobe_local_send_msg(struct wprobe_iface *dev, struct nl_msg *msg, wprobe_cb_t callback, void *arg)
+{
+	struct nl_cb *cb;
+	int err = 0;
+
+	cb = nl_cb_alloc(NL_CB_DEFAULT);
+	if (!cb)
+		goto out_no_cb;
+
+	if (callback)
+		nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, callback, arg);
+
+	err = nl_send_auto_complete(handle, msg);
+	if (err < 0)
+		goto out;
+
+	err = 1;
+
+	nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &err);
+	nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, finish_handler, &err);
+	nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, ack_handler, &err);
+
+	while (err > 0)
+		nl_recvmsgs(handle, cb);
+
+out:
+	nl_cb_put(cb);
+out_no_cb:
+	nlmsg_free(msg);
+	return err;
+}
+
+static const struct wprobe_iface_ops wprobe_local_ops = {
+	.send_msg = wprobe_local_send_msg,
+	.free = wprobe_local_free,
+};
+
+struct wprobe_iface *
+wprobe_get_dev(const char *ifname)
+{
+	struct wprobe_iface *dev;
+
+	if (wprobe_local_init() != 0)
+		return NULL;
+
+	dev = wprobe_alloc_dev();
+	if (!dev)
+		goto error_alloc;
+
+	dev->ifname = strdup(ifname);
+	dev->ops = &wprobe_local_ops;
+	dev->genl_family = genl_family_get_id(family);
+
+	if (wprobe_init_dev(dev) < 0)
+		goto error;
+
+	return dev;
+
+error:
+	free(dev);
+error_alloc:
+	wprobe_local_free(NULL);
+	return NULL;
+}
+
+#endif
+
+static void swap_nlmsghdr(struct nlmsghdr *nlh)
+{
+	SWAP32(nlh->nlmsg_len);
+	SWAP16(nlh->nlmsg_type);
+	SWAP16(nlh->nlmsg_flags);
+	SWAP32(nlh->nlmsg_seq);
+	SWAP32(nlh->nlmsg_pid);
+}
+
+static void swap_genlmsghdr(struct genlmsghdr *gnlh)
+{
+#if 0 /* probably unnecessary */
+	SWAP16(gnlh->reserved);
+#endif
+}
+
+static void
+wprobe_swap_nested(void *data, int len, bool outgoing)
+{
+	void *end = data + len;
+
+	while (data < end) {
+		struct nlattr *nla = data;
+		unsigned int type, len;
+
+		if (!outgoing) {
+			SWAP16(nla->nla_len);
+			SWAP16(nla->nla_type);
+
+			/* required for further sanity checks */
+			if (data + nla->nla_len > end)
+				nla->nla_len = end - data;
+		}
+
+		len = NLA_ALIGN(nla->nla_len);
+		type = nla->nla_type & NLA_TYPE_MASK;
+
+		if (type <= WPROBE_ATTR_LAST) {
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+			switch(attribute_policy[type].type) {
+			case NLA_U16:
+				SWAP16(*(__u16 *)nla_data(nla));
+				break;
+			case NLA_U32:
+				SWAP32(*(__u32 *)nla_data(nla));
+				break;
+			case NLA_U64:
+				SWAP64(*(__u64 *)nla_data(nla));
+				break;
+			case NLA_NESTED:
+				wprobe_swap_nested(nla_data(nla), nla_len(nla), outgoing);
+				break;
+			}
+#endif
+		}
+		data += len;
+
+		if (outgoing) {
+			SWAP16(nla->nla_len);
+			SWAP16(nla->nla_type);
+		}
+		if (!nla->nla_len)
+			break;
+	}
+}
+
+static struct nl_msg *
+wprobe_msg_from_network(int socket, int len)
+{
+	struct genlmsghdr *gnlh;
+	struct nlmsghdr *nlh;
+	struct nl_msg *msg;
+	void *data;
+
+	msg = nlmsg_alloc_size(len + 32);
+	if (!msg)
+		return NULL;
+
+	nlh = nlmsg_hdr(msg);
+	if (read(socket, nlh, len) != len)
+		goto free;
+
+	swap_nlmsghdr(nlh);
+	if (nlh->nlmsg_len > len)
+		goto free;
+
+	gnlh = nlmsg_data(nlh);
+	swap_genlmsghdr(gnlh);
+
+	data = genlmsg_data(gnlh);
+	wprobe_swap_nested(data, genlmsg_len(gnlh), false);
+
+	return msg;
+free:
+	nlmsg_free(msg);
+	return NULL;
+}
+
+static int
+wprobe_msg_to_network(int socket, struct nl_msg *msg)
+{
+	struct nlmsghdr *nlh = nlmsg_hdr(msg);
+	struct wprobe_msg_hdr mhdr;
+	struct genlmsghdr *gnlh;
+	void *buf, *data;
+	int buflen, datalen;
+	int ret;
+
+	buflen = nlh->nlmsg_len;
+	buf = malloc(buflen);
+	if (!buf)
+		return -ENOMEM;
+
+	memset(&mhdr, 0, sizeof(mhdr));
+	mhdr.status = WPROBE_MSG_DATA;
+	mhdr.len = buflen;
+	wprobe_swap_msg_hdr(&mhdr);
+	write(socket, &mhdr, sizeof(mhdr));
+
+	memcpy(buf, nlh, buflen);
+	nlh = buf;
+	gnlh = nlmsg_data(nlh);
+	data = genlmsg_data(gnlh);
+	datalen = genlmsg_len(gnlh);
+
+	wprobe_swap_nested(data, datalen, true);
+	swap_genlmsghdr(gnlh);
+	swap_nlmsghdr(nlh);
+	ret = write(socket, buf, buflen);
+	free(buf);
+
+	return ret;
+}
+
+static int
+wprobe_remote_send_msg(struct wprobe_iface *dev, struct nl_msg *msg, wprobe_cb_t callback, void *arg)
+{
+	struct wprobe_msg_hdr mhdr;
+	int msgs = 0;
+
+	wprobe_msg_to_network(dev->sockfd, msg);
+	nlmsg_free(msg);
+	do {
+		if (read(dev->sockfd, &mhdr, sizeof(mhdr)) != sizeof(mhdr)) {
+			DPRINTF("Failed to read response header\n");
+			return -1;
+		}
+		wprobe_swap_msg_hdr(&mhdr);
+
+		switch(mhdr.status) {
+		case WPROBE_MSG_DATA:
+			if (mhdr.len > WPROBE_MAX_MSGLEN) {
+				fprintf(stderr, "Invalid length in received response message.\n");
+				exit(1);
+			}
+
+			msg = wprobe_msg_from_network(dev->sockfd, mhdr.len);
+			if (!msg)
+				return -EINVAL;
+
+			msgs++;
+			callback(msg, arg);
+			nlmsg_free(msg);
+			break;
+		}
+	} while (mhdr.status != WPROBE_MSG_DONE);
+
+	if (mhdr.error)
+		return -mhdr.error;
+	else
+		return msgs;
+}
+
+
+static void
+wprobe_socket_dev_free(struct wprobe_iface *dev)
+{
+	if (dev->sockfd >= 0)
+		close(dev->sockfd);
+}
+
+static const struct wprobe_iface_ops wprobe_remote_ops = {
+	.send_msg = wprobe_remote_send_msg,
+	.free = wprobe_socket_dev_free,
+};
+
+
+#ifndef NO_LOCAL_ACCESS 
+int
+wprobe_server_init(int socket)
+{
+	struct wprobe_init_hdr hdr;
+	int ret;
+
+	ret = wprobe_local_init();
+	if (ret != 0)
+		return ret;
+
+	memset(&hdr, 0, sizeof(hdr));
+	memcpy(hdr.pre.magic, WPROBE_MAGIC_STR, sizeof(WPROBE_MAGIC_STR));
+	hdr.pre.version = 0;
+	hdr.v0.genl_family = genl_family_get_id(family);
+	SWAP16(hdr.v0.genl_family);
+	write(socket, (unsigned char *)&hdr, sizeof(hdr));
+
+	return 0;
+}
+
+static int
+wprobe_server_cb(struct nl_msg *msg, void *arg)
+{
+	int *socket = arg;
+	int ret;
+
+	ret = wprobe_msg_to_network(*socket, msg);
+	if (ret > 0)
+		ret = 0;
+
+	return ret;
+}
+
+
+int
+wprobe_server_handle(int socket)
+{
+	struct wprobe_msg_hdr mhdr;
+	struct nl_msg *msg;
+	int ret;
+
+	ret = read(socket, &mhdr, sizeof(mhdr));
+	if (ret != sizeof(mhdr)) {
+		if (ret <= 0)
+			return -1;
+
+		DPRINTF("Failed to read request header\n");
+		return -EINVAL;
+	}
+	wprobe_swap_msg_hdr(&mhdr);
+
+	switch(mhdr.status) {
+	case WPROBE_MSG_DATA:
+		if (mhdr.len > WPROBE_MAX_MSGLEN) {
+			DPRINTF("Invalid length in received response message.\n");
+			return -EINVAL;
+		}
+		msg = wprobe_msg_from_network(socket, mhdr.len);
+		break;
+	default:
+		DPRINTF("Invalid request header type\n");
+		return -ENOENT;
+	}
+
+	if (!msg) {
+		DPRINTF("Failed to get message\n");
+		return -EINVAL;
+	}
+
+	ret = wprobe_local_send_msg(NULL, msg, wprobe_server_cb, &socket);
+
+	memset(&mhdr, 0, sizeof(mhdr));
+	mhdr.status = WPROBE_MSG_DONE;
+	if (ret < 0)
+		mhdr.error = (uint16_t) -ret;
+
+	ret = write(socket, (unsigned char *)&mhdr, sizeof(mhdr));
+	if (ret > 0)
+		ret = 0;
+
+	return ret;
+}
+
+void
+wprobe_server_done(void)
+{
+	wprobe_local_free(NULL);
+}
+#endif
+
+struct wprobe_iface *
+wprobe_get_from_socket(int socket, const char *name)
+{
+	struct wprobe_iface *dev;
+	struct wprobe_init_hdr hdr;
+
+	dev = wprobe_alloc_dev();
+	if (!dev)
+		goto out;
+
+	dev->ops = &wprobe_remote_ops;
+	dev->sockfd = socket;
+	dev->ifname = strdup(name);
+
+	/* read version and header length */
+	if (read(socket, &hdr.pre, sizeof(hdr.pre)) != sizeof(hdr.pre)) {
+		DPRINTF("Could not read header\n");
+		goto error;
+	}
+
+	/* magic not found */
+	if (memcmp(hdr.pre.magic, WPROBE_MAGIC_STR, sizeof(hdr.pre.magic)) != 0) {
+		DPRINTF("Magic does not match\n");
+		goto error;
+	}
+
+	/* unsupported version */
+	if (hdr.pre.version != 0) {
+		DPRINTF("Protocol version does not match\n");
+		goto error;
+	}
+
+	if (read(socket, &hdr.v0, sizeof(hdr.v0)) != sizeof(hdr.v0)) {
+		DPRINTF("Could not read header data\n");
+		goto error;
+	}
+
+	SWAP16(hdr.pre.extra);
+	SWAP16(hdr.v0.genl_family);
+	dev->genl_family = hdr.v0.genl_family;
+
+	if (wprobe_init_dev(dev) < 0) {
+		DPRINTF("Could not initialize device\n");
+		goto error;
+	}
+
+out:
+	return dev;
+
+error:
+	wprobe_free_dev(dev);
+	return NULL;
+}
+
+struct wprobe_iface *
+wprobe_get_auto(const char *arg, char **err)
+{
+	static struct sockaddr_in sa;
+	static char errbuf[512];
+
+	struct wprobe_iface *dev = NULL;
+	struct hostent *h;
+	char *devstr = strdup(arg);
+	char *sep = NULL;
+	int sock = -1;
+	int len;
+
+	if (err)
+		*err = NULL;
+
+	sep = strchr(devstr, ':');
+	if (!sep) {
+#ifndef NO_LOCAL_ACCESS 
+		free(devstr);
+		return wprobe_get_dev(arg);
+#else
+		*err = "Invalid argument";
+		goto out;
+#endif
+	}
+
+	*sep = 0;
+	sep++;
+
+	sock = socket(AF_INET, SOCK_STREAM, 0);
+	if (sock < 0)
+		goto syserr;
+
+	h = gethostbyname(devstr);
+	if (!h) {
+		sprintf(errbuf, "Host not found");
+		goto out_err;
+	}
+
+	memcpy(&sa.sin_addr, h->h_addr, h->h_length);
+	sa.sin_family = AF_INET;
+	sa.sin_port = htons(wprobe_port);
+	if (connect(sock, (struct sockaddr *)&sa, sizeof(sa)) < 0)
+		goto syserr;
+
+	dev = wprobe_get_from_socket(sock, sep);
+	if (!dev) {
+		sprintf(errbuf, "wprobe connection initialization failed");
+		goto out_err;
+	}
+	goto out;
+
+syserr:
+	if (err) {
+		strcpy(errbuf, "Connection failed: ");
+		len = strlen(errbuf);
+		strerror_r(errno, errbuf + len, sizeof(errbuf) - len - 1);
+	}
+out_err:
+	if (err)
+		*err = errbuf;
+	if (sock >= 0)
+		close(sock);
+out:
+	if (devstr)
+		free(devstr);
+	return dev;
+}
+
+static void
+free_attr_list(struct list_head *list)
+{
+	struct wprobe_attribute *attr, *tmp;
+
+	list_for_each_entry_safe(attr, tmp, list, list) {
+		list_del(&attr->list);
+		free(attr);
+	}
+}
+
+void
+wprobe_free_dev(struct wprobe_iface *dev)
+{
+	if (dev->ops->free)
+		dev->ops->free(dev);
+	free_attr_list(&dev->global_attr);
+	free_attr_list(&dev->link_attr);
+	free((void *)dev->ifname);
+	free(dev);
+}
+
+static struct wprobe_link *
+get_link(struct list_head *list, const char *addr)
+{
+	struct wprobe_link *l;
+
+	list_for_each_entry(l, list, list) {
+		if (!memcmp(l->addr, addr, 6)) {
+			list_del_init(&l->list);
+			goto out;
+		}
+	}
+
+	/* no previous link found, allocate a new one */
+	l = malloc(sizeof(struct wprobe_link));
+	if (!l)
+		goto out;
+
+	memset(l, 0, sizeof(struct wprobe_link));
+	memcpy(l->addr, addr, sizeof(l->addr));
+	INIT_LIST_HEAD(&l->list);
+
+out:
+	return l;
+}
+
+struct wprobe_save_cb {
+	struct list_head *list;
+	struct list_head old_list;
+};
+
+static int
+save_link_handler(struct nl_msg *msg, void *arg)
+{
+	struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
+	struct wprobe_link *link;
+	struct wprobe_save_cb *cb = arg;
+	const char *addr;
+
+	nla_parse(tb, WPROBE_ATTR_LAST, genlmsg_attrdata(gnlh, 0),
+			genlmsg_attrlen(gnlh, 0), attribute_policy);
+
+	if (!tb[WPROBE_ATTR_MAC] || (nla_len(tb[WPROBE_ATTR_MAC]) != 6))
+		return -1;
+
+	addr = nla_data(tb[WPROBE_ATTR_MAC]);
+	link = get_link(&cb->old_list, addr);
+	if (!link)
+		return -1;
+
+	if (tb[WPROBE_ATTR_FLAGS])
+		link->flags = nla_get_u32(tb[WPROBE_ATTR_FLAGS]);
+
+	list_add_tail(&link->list, cb->list);
+	return 0;
+}
+
+
+int
+wprobe_update_links(struct wprobe_iface *dev)
+{
+	struct wprobe_link *l, *tmp;
+	struct nl_msg *msg;
+	struct wprobe_save_cb cb;
+	int err;
+
+	INIT_LIST_HEAD(&cb.old_list);
+	list_splice_init(&dev->links, &cb.old_list);
+	cb.list = &dev->links;
+
+	msg = wprobe_new_msg(dev, WPROBE_CMD_GET_LINKS, true);
+	if (!msg)
+		return -ENOMEM;
+
+	err = dev->ops->send_msg(dev, msg, save_link_handler, &cb);
+	if (err < 0)
+		return err;
+
+	list_for_each_entry_safe(l, tmp, &cb.old_list, list) {
+		list_del(&l->list);
+		free(l);
+	}
+
+	return 0;
+}
+
+
+struct wprobe_filter_data
+{
+	wprobe_filter_cb cb;
+	void *arg;
+	struct wprobe_filter_item *buf;
+	int buflen;
+};
+
+static int
+dump_filter_handler(struct nl_msg *msg, void *arg)
+{
+	struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
+	struct wprobe_filter_data *data = arg;
+	struct nlattr *p;
+	const char *name;
+	int count = 0;
+	int len;
+
+	nla_parse(tb, WPROBE_ATTR_LAST, genlmsg_attrdata(gnlh, 0),
+			genlmsg_attrlen(gnlh, 0), attribute_policy);
+
+	if (!tb[WPROBE_ATTR_NAME] || !tb[WPROBE_ATTR_FILTER_GROUP])
+		return -1;
+
+	name = nla_data(tb[WPROBE_ATTR_NAME]);
+	nla_for_each_nested(p, tb[WPROBE_ATTR_FILTER_GROUP], len) {
+		count++;
+	}
+
+	if (data->buflen < count) {
+		if (data->buf)
+			free(data->buf);
+		data->buflen = count;
+		data->buf = malloc(sizeof(struct wprobe_filter_item) * count);
+		memset(data->buf, 0, sizeof(struct wprobe_filter_item) * count);
+	}
+
+	count = 0;
+	nla_for_each_nested(p, tb[WPROBE_ATTR_FILTER_GROUP], len) {
+		struct wprobe_filter_item *fi;
+
+		nla_parse(tb, WPROBE_ATTR_LAST, nla_data(p),
+				nla_len(p), attribute_policy);
+
+		if (!tb[WPROBE_ATTR_NAME] || !tb[WPROBE_ATTR_RXCOUNT]
+				|| !tb[WPROBE_ATTR_TXCOUNT])
+			continue;
+
+		fi = &data->buf[count++];
+		strncpy(fi->name, nla_data(tb[WPROBE_ATTR_NAME]), sizeof(fi->name) - 1);
+		fi->name[sizeof(fi->name) - 1] = 0;
+		fi->rx = nla_get_u64(tb[WPROBE_ATTR_RXCOUNT]);
+		fi->tx = nla_get_u64(tb[WPROBE_ATTR_TXCOUNT]);
+	}
+	data->cb(data->arg, name, data->buf, count);
+
+	return 0;
+}
+
+int
+wprobe_dump_filters(struct wprobe_iface *dev, wprobe_filter_cb cb, void *arg)
+{
+	struct wprobe_filter_data data;
+	struct nl_msg *msg;
+	int err;
+
+	data.buf = 0;
+	data.buflen = 0;
+	data.cb = cb;
+	data.arg = arg;
+
+	msg = wprobe_new_msg(dev, WPROBE_CMD_GET_FILTER, true);
+	if (!msg)
+		return -ENOMEM;
+
+	err = dev->ops->send_msg(dev, msg, dump_filter_handler, &data);
+	if (err < 0)
+		return err;
+
+	return 0;
+}
+
+int
+wprobe_apply_config(struct wprobe_iface *dev)
+{
+	struct nl_msg *msg;
+
+	msg = wprobe_new_msg(dev, WPROBE_CMD_CONFIG, false);
+	if (!msg)
+		return -ENOMEM;
+
+	if (dev->interval >= 0)
+		NLA_PUT_MSECS(msg, WPROBE_ATTR_INTERVAL, dev->interval);
+
+	if (dev->filter_len < 0) {
+		NLA_PUT(msg, WPROBE_ATTR_FILTER, 0, NULL);
+		dev->filter_len = 0;
+	} else if (dev->filter && dev->filter_len > 0) {
+		NLA_PUT(msg, WPROBE_ATTR_FILTER, dev->filter_len, dev->filter);
+	}
+	dev->filter = NULL;
+
+	dev->ops->send_msg(dev, msg, NULL, NULL);
+	return 0;
+
+nla_put_failure:
+	nlmsg_free(msg);
+	return -ENOMEM;
+}
+
+int
+wprobe_measure(struct wprobe_iface *dev)
+{
+	struct nl_msg *msg;
+
+	msg = wprobe_new_msg(dev, WPROBE_CMD_MEASURE, false);
+	if (!msg)
+		return -ENOMEM;
+
+	dev->ops->send_msg(dev, msg, NULL, NULL);
+	return 0;
+}
+
+struct wprobe_request_cb {
+	struct list_head *list;
+	struct list_head old_list;
+	char *addr;
+};
+
+static int
+save_attrdata_handler(struct nl_msg *msg, void *arg)
+{
+	struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
+	struct wprobe_request_cb *cb = arg;
+	struct wprobe_attribute *attr;
+	int type, id;
+
+	nla_parse(tb, WPROBE_ATTR_LAST, genlmsg_attrdata(gnlh, 0),
+			genlmsg_attrlen(gnlh, 0), attribute_policy);
+
+	if (!tb[WPROBE_ATTR_ID])
+		return -1;
+
+	if (!tb[WPROBE_ATTR_TYPE])
+		return -1;
+
+	id = nla_get_u32(tb[WPROBE_ATTR_ID]);
+	list_for_each_entry(attr, &cb->old_list, list) {
+		if (attr->id == id)
+			goto found;
+	}
+	/* not found */
+	return -1;
+
+found:
+	list_del_init(&attr->list);
+
+	type = nla_get_u8(tb[WPROBE_ATTR_TYPE]);
+	if (type != attr->type) {
+		DPRINTF("WARNING: type mismatch for %s attribute '%s' (%d != %d)\n",
+			(cb->addr ? "link" : "global"),
+			attr->name,
+			type, attr->type);
+		goto out;
+	}
+
+	if ((type < WPROBE_VAL_STRING) ||
+		(type > WPROBE_VAL_U64))
+		goto out;
+
+	memset(&attr->val, 0, sizeof(attr->val));
+
+#define HANDLE_INT_TYPE(_idx, _type) \
+	case WPROBE_VAL_S##_type: \
+	case WPROBE_VAL_U##_type: \
+		attr->val.U##_type = nla_get_u##_type(tb[_idx]); \
+		break
+
+	switch(type) {
+		HANDLE_INT_TYPE(type, 8);
+		HANDLE_INT_TYPE(type, 16);
+		HANDLE_INT_TYPE(type, 32);
+		HANDLE_INT_TYPE(type, 64);
+		case WPROBE_VAL_STRING:
+			/* unimplemented */
+			break;
+	}
+#undef HANDLE_TYPE
+
+	if (attr->flags & WPROBE_F_KEEPSTAT) {
+		if (tb[WPROBE_VAL_SUM])
+			attr->val.s = nla_get_u64(tb[WPROBE_VAL_SUM]);
+
+		if (tb[WPROBE_VAL_SUM_SQ])
+			attr->val.ss = nla_get_u64(tb[WPROBE_VAL_SUM_SQ]);
+
+		if (tb[WPROBE_VAL_SAMPLES])
+			attr->val.n = nla_get_u32(tb[WPROBE_VAL_SAMPLES]);
+
+		if (attr->val.n > 0) {
+			float avg = ((float) attr->val.s) / attr->val.n;
+			float stdev = sqrt((((float) attr->val.ss) / attr->val.n) - (avg * avg));
+			if (isnan(stdev))
+				stdev = 0.0f;
+			if (isnan(avg))
+				avg = 0.0f;
+			attr->val.avg = avg;
+			attr->val.stdev = stdev;
+		}
+	}
+
+out:
+	list_add_tail(&attr->list, cb->list);
+	return 0;
+}
+
+
+int
+wprobe_request_data(struct wprobe_iface *dev, const unsigned char *addr)
+{
+	struct wprobe_request_cb cb;
+	struct list_head *attrs;
+	struct nl_msg *msg;
+	int err;
+
+	msg = wprobe_new_msg(dev, WPROBE_CMD_GET_INFO, true);
+	if (!msg)
+		return -ENOMEM;
+
+	if (addr) {
+		attrs = &dev->link_attr;
+		NLA_PUT(msg, WPROBE_ATTR_MAC, 6, addr);
+	} else {
+		attrs = &dev->global_attr;
+	}
+
+	INIT_LIST_HEAD(&cb.old_list);
+	list_splice_init(attrs, &cb.old_list);
+	cb.list = attrs;
+
+	err = dev->ops->send_msg(dev, msg, save_attrdata_handler, &cb);
+	list_splice(&cb.old_list, attrs->prev);
+	return err;
+
+nla_put_failure:
+	nlmsg_free(msg);
+	return -ENOMEM;
+}
+
+
diff --git a/package/wprobe/src/user/wprobe-util.c b/package/wprobe/src/user/wprobe-util.c
new file mode 100644
index 0000000..d5d440a
--- /dev/null
+++ b/package/wprobe/src/user/wprobe-util.c
@@ -0,0 +1,441 @@
+/*
+ * wprobe-test.c: Wireless probe user space test code
+ * Copyright (C) 2008-2009 Felix Fietkau <nbd@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include <arpa/inet.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <inttypes.h>
+#include <errno.h>
+#include <stdint.h>
+#include <getopt.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <netdb.h>
+#include <fcntl.h>
+#include <signal.h>
+
+#include <linux/wprobe.h>
+#include "wprobe.h"
+
+static bool simple_mode = false;
+
+static const char *
+wprobe_dump_value(struct wprobe_attribute *attr)
+{
+	static char buf[128];
+
+#define HANDLE_TYPE(_type, _format) \
+	case WPROBE_VAL_##_type: \
+		snprintf(buf, sizeof(buf), _format, attr->val._type); \
+		break
+
+	switch(attr->type) {
+		HANDLE_TYPE(S8, "%d");
+		HANDLE_TYPE(S16, "%d");
+		HANDLE_TYPE(S32, "%d");
+		HANDLE_TYPE(S64, "%lld");
+		HANDLE_TYPE(U8, "%d");
+		HANDLE_TYPE(U16, "%d");
+		HANDLE_TYPE(U32, "%d");
+		HANDLE_TYPE(U64, "%lld");
+		case WPROBE_VAL_STRING:
+			/* FIXME: implement this */
+		default:
+			strncpy(buf, "<unknown>", sizeof(buf));
+			break;
+	}
+	if ((attr->flags & WPROBE_F_KEEPSTAT) &&
+		(attr->val.n > 0)) {
+		int len = strlen(buf);
+		if (simple_mode)
+			snprintf(buf + len, sizeof(buf) - len, ";%.02f;%.02f;%d;%lld;%lld", attr->val.avg, attr->val.stdev, attr->val.n, attr->val.s, attr->val.ss);
+		else
+			snprintf(buf + len, sizeof(buf) - len, " (avg: %.02f; stdev: %.02f, n=%d)", attr->val.avg, attr->val.stdev, attr->val.n);
+	}
+#undef HANDLE_TYPE
+
+	return buf;
+}
+
+
+static void
+wprobe_dump_data(struct wprobe_iface *dev)
+{
+	struct wprobe_attribute *attr;
+	struct wprobe_link *link;
+	bool first = true;
+
+	if (!simple_mode)
+		fprintf(stderr, "\n");
+	wprobe_request_data(dev, NULL);
+	list_for_each_entry(attr, &dev->global_attr, list) {
+		if (simple_mode) {
+			if (first)
+				fprintf(stdout, "[global]\n");
+			fprintf(stdout, "%s=%s\n", attr->name, wprobe_dump_value(attr));
+		} else {
+			fprintf(stderr, (first ?
+				"Global:            %s=%s\n" :
+				"                   %s=%s\n"),
+				attr->name,
+				wprobe_dump_value(attr)
+			);
+		}
+		first = false;
+	}
+
+	list_for_each_entry(link, &dev->links, list) {
+		first = true;
+		wprobe_request_data(dev, link->addr);
+		list_for_each_entry(attr, &dev->link_attr, list) {
+			if (first) {
+				fprintf((simple_mode ? stdout : stderr),
+					(simple_mode ? 
+					 "[%02x:%02x:%02x:%02x:%02x:%02x]\n%s=%s\n" :
+					 "%02x:%02x:%02x:%02x:%02x:%02x: %s=%s\n"),
+					link->addr[0], link->addr[1], link->addr[2],
+					link->addr[3], link->addr[4], link->addr[5],
+					attr->name,
+					wprobe_dump_value(attr));
+				first = false;
+			} else {
+				fprintf((simple_mode ? stdout : stderr),
+					(simple_mode ? "%s=%s\n" :
+					 "                   %s=%s\n"),
+					attr->name,
+					wprobe_dump_value(attr));
+			}
+		}
+	}
+	fflush(stdout);
+}
+
+static const char *attr_typestr[] = {
+	[0] = "Unknown",
+	[WPROBE_VAL_STRING] = "String",
+	[WPROBE_VAL_U8] = "Unsigned 8 bit",
+	[WPROBE_VAL_U16] = "Unsigned 16 bit",
+	[WPROBE_VAL_U32] = "Unsigned 32 bit",
+	[WPROBE_VAL_U64] = "Unsigned 64 bit",
+	[WPROBE_VAL_S8] = "Signed 8 bit",
+	[WPROBE_VAL_S16] = "Signed 16 bit",
+	[WPROBE_VAL_S32] = "Signed 32 bit",
+	[WPROBE_VAL_S64] = "Signed 64 bit",
+};
+
+static int usage(const char *prog)
+{
+	fprintf(stderr,
+#ifndef NO_LOCAL_ACCESS 
+		"Usage: %s <interface>|<host>:<device>|-P [options]\n"
+#else
+		"Usage: %s <host>:<device> [options]\n"
+#endif
+		"\n"
+		"Options:\n"
+		"  -c:            Only apply configuration\n"
+		"  -d:            Delay between measurement dumps (in milliseconds, default: 1000)\n"
+		"  -f:            Dump contents of layer 2 filter counters during measurement\n"
+		"  -F <file>:     Apply layer 2 filters from <file>\n"
+		"  -h:            This help text\n"
+		"  -i <interval>: Set measurement interval\n"
+		"  -m:            Run measurement loop\n"
+		"  -p:            Set the TCP port for server/client (default: 17990)\n"
+#ifndef NO_LOCAL_ACCESS 
+		"  -P:            Run in proxy mode (listen on network)\n"
+#endif
+		"\n"
+		, prog);
+	exit(1);
+}
+
+static void show_attributes(struct wprobe_iface *dev)
+{
+	struct wprobe_attribute *attr;
+	if (simple_mode)
+		return;
+	list_for_each_entry(attr, &dev->global_attr, list) {
+		fprintf(stderr, "Global attribute: '%s' (%s)\n",
+			attr->name, attr_typestr[attr->type]);
+	}
+	list_for_each_entry(attr, &dev->link_attr, list) {
+		fprintf(stderr, "Link attribute: '%s' (%s)\n",
+			attr->name, attr_typestr[attr->type]);
+	}
+}
+
+static void show_filter_simple(void *arg, const char *group, struct wprobe_filter_item *items, int n_items)
+{
+	int i;
+
+	fprintf(stdout, "[filter:%s]\n", group);
+	for (i = 0; i < n_items; i++) {
+		fprintf(stdout, "%s=%lld;%lld\n",
+			items[i].name, items[i].tx, items[i].rx);
+	}
+	fflush(stdout);
+}
+
+
+static void show_filter(void *arg, const char *group, struct wprobe_filter_item *items, int n_items)
+{
+	int i;
+	fprintf(stderr, "Filter group: '%s' (tx/rx)\n", group);
+	for (i = 0; i < n_items; i++) {
+		fprintf(stderr, " - %s (%lld/%lld)\n",
+			items[i].name, items[i].tx, items[i].rx);
+	}
+}
+
+static void loop_measurement(struct wprobe_iface *dev, bool print_filters, unsigned long delay)
+{
+	while (1) {
+		usleep(delay * 1000);
+		wprobe_update_links(dev);
+		wprobe_dump_data(dev);
+		if (print_filters)
+			wprobe_dump_filters(dev, simple_mode ? show_filter_simple : show_filter, NULL);
+	}
+}
+
+static void set_filter(struct wprobe_iface *dev, const char *filename)
+{
+	unsigned char *buf = NULL;
+	unsigned int buflen = 0;
+	unsigned int len = 0;
+	int fd;
+
+	/* clear filter */
+	if (filename[0] == 0) {
+		dev->filter_len = -1;
+		return;
+	}
+
+	fd = open(filename, O_RDONLY);
+	if (fd < 0) {
+		perror("open filter");
+		return;
+	}
+
+	do {
+		int rlen;
+
+		if (!buf) {
+			len = 0;
+			buflen = 1024;
+			buf = malloc(1024);
+		} else {
+			buflen *= 2;
+			buf = realloc(buf, buflen);
+		}
+		rlen = read(fd, buf + len, buflen - len);
+		if (rlen < 0)
+			break;
+
+		len += rlen;
+	} while (len == buflen);
+
+	dev->filter = buf;
+	dev->filter_len = len;
+	close(fd);
+}
+
+#ifndef NO_LOCAL_ACCESS
+
+static void sigchld_handler(int s)
+{
+	while (waitpid(-1, NULL, WNOHANG) > 0);
+}
+
+static int run_proxy(int port)
+{
+	struct sockaddr_in sa;
+	struct sigaction sig;
+	int v = 1;
+	int s;
+
+	s = socket(AF_INET, SOCK_STREAM, 0);
+	if (s < 0) {
+		perror("socket");
+		return 1;
+	}
+
+	sig.sa_handler = sigchld_handler;  // Signal Handler fuer Zombie Prozesse
+	sigemptyset(&sig.sa_mask);
+	sig.sa_flags = SA_RESTART;
+	sigaction(SIGCHLD, &sig, NULL);
+
+	memset(&sa, 0, sizeof(sa));
+	sa.sin_family = AF_INET;
+	sa.sin_addr.s_addr = htonl(INADDR_ANY);
+	sa.sin_port = htons(wprobe_port);
+
+	setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &v, sizeof(v));
+	if (bind(s, (struct sockaddr *) &sa, sizeof(sa)) < 0) {
+		perror("bind");
+		return 1;
+	}
+	if (listen(s, 10)) {
+		perror("listen");
+		return 1;
+	}
+	while(1) {
+		unsigned int addrlen;
+		int ret, c;
+
+		c = accept(s, (struct sockaddr *)&sa, &addrlen);
+		if (c < 0) {
+			if (errno == EINTR)
+				continue;
+
+			perror("accept");
+			return 1;
+		}
+		if (fork() == 0) {
+			/* close server socket, stdin, stdout, stderr */
+			close(s);
+			close(0);
+			close(1);
+			close(2);
+
+			wprobe_server_init(c);
+			do {
+				ret = wprobe_server_handle(c);
+			} while (ret >= 0);
+			wprobe_server_done();
+			close(c);
+			exit(0);
+		}
+		close(c);
+	}
+
+	return 0;
+}
+#endif
+
+int main(int argc, char **argv)
+{
+	struct wprobe_iface *dev = NULL;
+	const char *ifname;
+	const char *prog = argv[0];
+	char *err = NULL;
+	enum {
+		CMD_NONE,
+		CMD_CONFIG,
+		CMD_MEASURE,
+		CMD_PROXY,
+	} cmd = CMD_NONE;
+	const char *filter = NULL;
+	bool print_filters = false;
+	unsigned long delay = 1000;
+	int interval = -1;
+	int ch;
+
+	if (argc < 2)
+		return usage(prog);
+
+#ifndef NO_LOCAL_ACCESS 
+	if (!strcmp(argv[1], "-P")) {
+		while ((ch = getopt(argc - 1, argv + 1, "p:")) != -1) {
+			switch(ch) {
+			case 'p':
+				/* set port */
+				wprobe_port = strtoul(optarg, NULL, 0);
+				break;
+			default:
+				return usage(prog);
+			}
+		}
+		return run_proxy(wprobe_port);
+	}
+#endif
+
+	if (argv[1][0] == '-')
+		return usage(prog);
+
+	ifname = argv[1];
+	argv++;
+	argc--;
+
+	while ((ch = getopt(argc, argv, "cd:fF:hi:msp:")) != -1) {
+		switch(ch) {
+		case 'c':
+			cmd = CMD_CONFIG;
+			break;
+		case 'd':
+			delay = strtoul(optarg, NULL, 10);
+			break;
+		case 'm':
+			cmd = CMD_MEASURE;
+			break;
+		case 'i':
+			interval = strtoul(optarg, NULL, 10);
+			break;
+		case 'f':
+			print_filters = true;
+			break;
+		case 'F':
+			if (filter) {
+				fprintf(stderr, "Cannot set multiple filters\n");
+				return usage(prog);
+			}
+			filter = optarg;
+			break;
+		case 's':
+			simple_mode = true;
+			break;
+		case 'p':
+			/* set port */
+			wprobe_port = strtoul(optarg, NULL, 0);
+			break;
+		case 'h':
+		default:
+			usage(prog);
+			break;
+		}
+	}
+
+	dev = wprobe_get_auto(ifname, &err);
+	if (!dev || (list_empty(&dev->global_attr) &&
+		list_empty(&dev->link_attr))) {
+		if (err)
+			fprintf(stderr, "%s\n", err);
+		else
+			fprintf(stderr, "Interface '%s' not found\n", ifname);
+		return 1;
+	}
+
+	if (filter || interval >= 0) {
+		if (filter)
+			set_filter(dev, filter);
+		if (interval >= 0)
+			dev->interval = interval;
+
+		wprobe_apply_config(dev);
+	}
+
+	if (cmd != CMD_CONFIG)
+		show_attributes(dev);
+	if (cmd == CMD_MEASURE)
+		loop_measurement(dev, print_filters, delay);
+
+	wprobe_free_dev(dev);
+
+	return 0;
+}
diff --git a/package/wprobe/src/user/wprobe.c b/package/wprobe/src/user/wprobe.c
deleted file mode 100644
index e48f768..0000000
--- a/package/wprobe/src/user/wprobe.c
+++ /dev/null
@@ -1,571 +0,0 @@
-/*
- * wprobe.c: Wireless probe user space library
- * Copyright (C) 2008-2009 Felix Fietkau <nbd@openwrt.org>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- */
-
-#include <stdio.h>
-#include <string.h>
-#include <stdlib.h>
-#include <errno.h>
-#include <getopt.h>
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <math.h>
-#include <linux/wprobe.h>
-#include <netlink/netlink.h>
-#include <netlink/genl/genl.h>
-#include <netlink/genl/ctrl.h>
-#include <netlink/genl/family.h>
-#include "wprobe.h"
-
-#define DEBUG 1
-#ifdef DEBUG
-#define DPRINTF(fmt, ...) fprintf(stderr, "%s(%d): " fmt, __func__, __LINE__, ##__VA_ARGS__)
-#else
-#define DPRINTF(fmt, ...) do {} while (0)
-#endif
-
-static int n_devs = 0;
-static struct nl_sock *handle = NULL;
-static struct nl_cache *cache = NULL;
-static struct genl_family *family = NULL;
-static struct nlattr *tb[WPROBE_ATTR_LAST+1];
-static struct nla_policy attribute_policy[WPROBE_ATTR_LAST+1] = {
-	[WPROBE_ATTR_ID] = { .type = NLA_U32 },
-	[WPROBE_ATTR_MAC] = { .type = NLA_UNSPEC, .minlen = 6, .maxlen = 6 },
-	[WPROBE_ATTR_NAME] = { .type = NLA_STRING },
-	[WPROBE_ATTR_FLAGS] = { .type = NLA_U32 },
-	[WPROBE_ATTR_TYPE] = { .type = NLA_U8 },
-	[WPROBE_VAL_S8] = { .type = NLA_U8 },
-	[WPROBE_VAL_S16] = { .type = NLA_U16 },
-	[WPROBE_VAL_S32] = { .type = NLA_U32 },
-	[WPROBE_VAL_S64] = { .type = NLA_U64 },
-	[WPROBE_VAL_U8] = { .type = NLA_U8 },
-	[WPROBE_VAL_U16] = { .type = NLA_U16 },
-	[WPROBE_VAL_U32] = { .type = NLA_U32 },
-	[WPROBE_VAL_U64] = { .type = NLA_U64 },
-	[WPROBE_VAL_SUM] = { .type = NLA_U64 },
-	[WPROBE_VAL_SUM_SQ] = { .type = NLA_U64 },
-	[WPROBE_VAL_SAMPLES] = { .type = NLA_U32 },
-};
-
-static int
-error_handler(struct sockaddr_nl *nla, struct nlmsgerr *err, void *arg)
-{
-	int *ret = arg;
-	*ret = err->error;
-	return NL_STOP;
-}
-
-static int
-finish_handler(struct nl_msg *msg, void *arg)
-{
-	int *ret = arg;
-	*ret = 0;
-	return NL_SKIP;
-}
-
-static int
-ack_handler(struct nl_msg *msg, void *arg)
-{
-	int *ret = arg;
-	*ret = 0;
-	return NL_STOP;
-}
-
-
-static void
-wprobe_free(void)
-{
-	/* should not happen */
-	if (n_devs == 0)
-		return;
-
-	if (--n_devs != 0)
-		return;
-
-	if (cache)
-		nl_cache_free(cache);
-	if (handle)
-		nl_socket_free(handle);
-	handle = NULL;
-	cache = NULL;
-}
-
-static int
-wprobe_init(void)
-{
-	int ret;
-
-	if (n_devs++ > 0)
-		return 0;
-
-	handle = nl_socket_alloc();
-	if (!handle) {
-		DPRINTF("Failed to create handle\n");
-		goto err;
-	}
-
-	if (genl_connect(handle)) {
-		DPRINTF("Failed to connect to generic netlink\n");
-		goto err;
-	}
-
-	ret = genl_ctrl_alloc_cache(handle, &cache);
-	if (ret < 0) {
-		DPRINTF("Failed to allocate netlink cache\n");
-		goto err;
-	}
-
-	family = genl_ctrl_search_by_name(cache, "wprobe");
-	if (!family) {
-		DPRINTF("wprobe API not present\n");
-		goto err;
-	}
-	return 0;
-
-err:
-	wprobe_free();
-	return -EINVAL;
-}
-
-
-static struct nl_msg *
-wprobe_new_msg(const char *ifname, int cmd, bool dump)
-{
-	struct nl_msg *msg;
-	uint32_t flags = 0;
-
-	msg = nlmsg_alloc();
-	if (!msg)
-		return NULL;
-
-	if (dump)
-		flags |= NLM_F_DUMP;
-
-	genlmsg_put(msg, 0, 0, genl_family_get_id(family),
-			0, flags, cmd, 0);
-
-	NLA_PUT_STRING(msg, WPROBE_ATTR_INTERFACE, ifname);
-nla_put_failure:
-	return msg;
-}
-
-static int
-wprobe_send_msg(struct nl_msg *msg, void *callback, void *arg)
-{
-	struct nl_cb *cb;
-	int err = 0;
-
-	cb = nl_cb_alloc(NL_CB_DEFAULT);
-	if (!cb)
-		goto out_no_cb;
-
-	if (callback)
-		nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, callback, arg);
-
-	err = nl_send_auto_complete(handle, msg);
-	if (err < 0)
-		goto out;
-
-	err = 1;
-
-	nl_cb_err(cb, NL_CB_CUSTOM, error_handler, &err);
-	nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, finish_handler, &err);
-	nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, ack_handler, &err);
-
-	while (err > 0)
-		nl_recvmsgs(handle, cb);
-
-out:
-	nl_cb_put(cb);
-out_no_cb:
-	nlmsg_free(msg);
-	return err;
-}
-
-struct wprobe_attr_cb {
-	struct list_head *list;
-	char *addr;
-};
-
-static int
-save_attribute_handler(struct nl_msg *msg, void *arg)
-{
-	struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
-	const char *name = "N/A";
-	struct wprobe_attribute *attr;
-	int type = 0;
-	struct wprobe_attr_cb *cb = arg;
-
-	nla_parse(tb, WPROBE_ATTR_LAST, genlmsg_attrdata(gnlh, 0),
-			genlmsg_attrlen(gnlh, 0), attribute_policy);
-
-	if (tb[WPROBE_ATTR_NAME])
-		name = nla_data(tb[WPROBE_ATTR_NAME]);
-
-	attr = malloc(sizeof(struct wprobe_attribute) + strlen(name) + 1);
-	if (!attr)
-		return -1;
-
-	memset(attr, 0, sizeof(struct wprobe_attribute));
-
-	if (tb[WPROBE_ATTR_ID])
-		attr->id = nla_get_u32(tb[WPROBE_ATTR_ID]);
-
-	if (tb[WPROBE_ATTR_MAC] && cb->addr)
-		memcpy(cb->addr, nla_data(tb[WPROBE_ATTR_MAC]), 6);
-
-	if (tb[WPROBE_ATTR_FLAGS])
-		attr->flags = nla_get_u32(tb[WPROBE_ATTR_FLAGS]);
-
-	if (tb[WPROBE_ATTR_TYPE])
-		type = nla_get_u8(tb[WPROBE_ATTR_TYPE]);
-
-	if ((type < WPROBE_VAL_STRING) ||
-		(type > WPROBE_VAL_U64))
-		type = 0;
-
-	attr->type = type;
-	strcpy(attr->name, name);
-	INIT_LIST_HEAD(&attr->list);
-	list_add(&attr->list, cb->list);
-	return 0;
-}
-
-
-static int
-dump_attributes(const char *ifname, bool link, struct list_head *list, char *addr)
-{
-	struct nl_msg *msg;
-	struct wprobe_attr_cb cb;
-
-	cb.list = list;
-	cb.addr = addr;
-	msg = wprobe_new_msg(ifname, WPROBE_CMD_GET_LIST, true);
-	if (!msg)
-		return -ENOMEM;
-
-	if (link)
-		NLA_PUT(msg, WPROBE_ATTR_MAC, 6, "\x00\x00\x00\x00\x00\x00");
-
-	return wprobe_send_msg(msg, save_attribute_handler, &cb);
-
-nla_put_failure:
-	nlmsg_free(msg);
-	return -EINVAL;
-}
-
-struct wprobe_iface *
-wprobe_get_dev(const char *ifname)
-{
-	struct wprobe_iface *dev;
-
-	if (wprobe_init() != 0)
-		return NULL;
-
-	dev = malloc(sizeof(struct wprobe_iface));
-	if (!dev)
-		return NULL;
-
-	memset(dev, 0, sizeof(struct wprobe_iface));
-	dev->ifname = strdup(ifname);
-	if (!dev->ifname)
-		goto error;
-
-	dev->interval = -1;
-	dev->scale_min = -1;
-	dev->scale_max = -1;
-	dev->scale_m = -1;
-	dev->scale_d = -1;
-
-	INIT_LIST_HEAD(&dev->global_attr);
-	INIT_LIST_HEAD(&dev->link_attr);
-	INIT_LIST_HEAD(&dev->links);
-
-	dump_attributes(ifname, false, &dev->global_attr, NULL);
-	dump_attributes(ifname, true, &dev->link_attr, NULL);
-
-	return dev;
-
-error:
-	free(dev);
-	return NULL;
-}
-
-static void
-free_attr_list(struct list_head *list)
-{
-	struct wprobe_attribute *attr, *tmp;
-
-	list_for_each_entry_safe(attr, tmp, list, list) {
-		list_del(&attr->list);
-		free(attr);
-	}
-}
-
-void
-wprobe_free_dev(struct wprobe_iface *dev)
-{
-	wprobe_free();
-	free_attr_list(&dev->global_attr);
-	free_attr_list(&dev->link_attr);
-	free((void *)dev->ifname);
-	free(dev);
-}
-
-static struct wprobe_link *
-get_link(struct list_head *list, const char *addr)
-{
-	struct wprobe_link *l;
-
-	list_for_each_entry(l, list, list) {
-		if (!memcmp(l->addr, addr, 6)) {
-			list_del_init(&l->list);
-			goto out;
-		}
-	}
-
-	/* no previous link found, allocate a new one */
-	l = malloc(sizeof(struct wprobe_link));
-	if (!l)
-		goto out;
-
-	memset(l, 0, sizeof(struct wprobe_link));
-	memcpy(l->addr, addr, sizeof(l->addr));
-	INIT_LIST_HEAD(&l->list);
-
-out:
-	return l;
-}
-
-struct wprobe_save_cb {
-	struct list_head *list;
-	struct list_head old_list;
-};
-
-static int
-save_link_handler(struct nl_msg *msg, void *arg)
-{
-	struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
-	struct wprobe_link *link;
-	struct wprobe_save_cb *cb = arg;
-	const char *addr;
-
-	nla_parse(tb, WPROBE_ATTR_LAST, genlmsg_attrdata(gnlh, 0),
-			genlmsg_attrlen(gnlh, 0), attribute_policy);
-
-	if (!tb[WPROBE_ATTR_MAC] || (nla_len(tb[WPROBE_ATTR_MAC]) != 6))
-		return -1;
-
-	addr = nla_data(tb[WPROBE_ATTR_MAC]);
-	link = get_link(&cb->old_list, addr);
-	if (!link)
-		return -1;
-
-	if (tb[WPROBE_ATTR_FLAGS])
-		link->flags = nla_get_u32(tb[WPROBE_ATTR_FLAGS]);
-
-	list_add_tail(&link->list, cb->list);
-	return 0;
-}
-
-
-int
-wprobe_update_links(struct wprobe_iface *dev)
-{
-	struct wprobe_link *l, *tmp;
-	struct nl_msg *msg;
-	struct wprobe_save_cb cb;
-	int err;
-
-	INIT_LIST_HEAD(&cb.old_list);
-	list_splice_init(&dev->links, &cb.old_list);
-	cb.list = &dev->links;
-
-	msg = wprobe_new_msg(dev->ifname, WPROBE_CMD_GET_LINKS, true);
-	if (!msg)
-		return -ENOMEM;
-
-	err = wprobe_send_msg(msg, save_link_handler, &cb);
-	if (err < 0)
-		return err;
-
-	list_for_each_entry_safe(l, tmp, &cb.old_list, list) {
-		list_del(&l->list);
-		free(l);
-	}
-
-	return 0;
-}
-
-int
-wprobe_apply_config(struct wprobe_iface *dev)
-{
-	struct nl_msg *msg;
-
-	msg = wprobe_new_msg(dev->ifname, WPROBE_CMD_CONFIG, false);
-	if (!msg)
-		return -ENOMEM;
-
-	if (dev->interval >= 0)
-		NLA_PUT_MSECS(msg, WPROBE_ATTR_INTERVAL, dev->interval);
-
-	wprobe_send_msg(msg, NULL, NULL);
-	return 0;
-
-nla_put_failure:
-	nlmsg_free(msg);
-	return -ENOMEM;
-}
-
-int
-wprobe_measure(struct wprobe_iface *dev)
-{
-	struct nl_msg *msg;
-
-	msg = wprobe_new_msg(dev->ifname, WPROBE_CMD_MEASURE, false);
-	if (!msg)
-		return -ENOMEM;
-
-	wprobe_send_msg(msg, NULL, NULL);
-	return 0;
-}
-
-struct wprobe_request_cb {
-	struct list_head *list;
-	struct list_head old_list;
-	char *addr;
-};
-
-static int
-save_attrdata_handler(struct nl_msg *msg, void *arg)
-{
-	struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg));
-	struct wprobe_request_cb *cb = arg;
-	struct wprobe_attribute *attr;
-	int type, id;
-
-	nla_parse(tb, WPROBE_ATTR_LAST, genlmsg_attrdata(gnlh, 0),
-			genlmsg_attrlen(gnlh, 0), attribute_policy);
-
-	if (!tb[WPROBE_ATTR_ID])
-		return -1;
-
-	if (!tb[WPROBE_ATTR_TYPE])
-		return -1;
-
-	id = nla_get_u32(tb[WPROBE_ATTR_ID]);
-	list_for_each_entry(attr, &cb->old_list, list) {
-		if (attr->id == id)
-			goto found;
-	}
-	/* not found */
-	return -1;
-
-found:
-	list_del_init(&attr->list);
-
-	type = nla_get_u8(tb[WPROBE_ATTR_TYPE]);
-	if (type != attr->type) {
-		DPRINTF("WARNING: type mismatch for %s attribute '%s' (%d != %d)\n",
-			(cb->addr ? "link" : "global"),
-			attr->name,
-			type, attr->type);
-		goto out;
-	}
-
-	if ((type < WPROBE_VAL_STRING) ||
-		(type > WPROBE_VAL_U64))
-		goto out;
-
-	memset(&attr->val, 0, sizeof(attr->val));
-
-#define HANDLE_INT_TYPE(_idx, _type) \
-	case WPROBE_VAL_S##_type: \
-	case WPROBE_VAL_U##_type: \
-		attr->val.U##_type = nla_get_u##_type(tb[_idx]); \
-		break
-
-	switch(type) {
-		HANDLE_INT_TYPE(type, 8);
-		HANDLE_INT_TYPE(type, 16);
-		HANDLE_INT_TYPE(type, 32);
-		HANDLE_INT_TYPE(type, 64);
-		case WPROBE_VAL_STRING:
-			/* unimplemented */
-			break;
-	}
-#undef HANDLE_TYPE
-
-	if (attr->flags & WPROBE_F_KEEPSTAT) {
-		if (tb[WPROBE_VAL_SUM])
-			attr->val.s = nla_get_u64(tb[WPROBE_VAL_SUM]);
-
-		if (tb[WPROBE_VAL_SUM_SQ])
-			attr->val.ss = nla_get_u64(tb[WPROBE_VAL_SUM_SQ]);
-
-		if (tb[WPROBE_VAL_SAMPLES])
-			attr->val.n = nla_get_u32(tb[WPROBE_VAL_SAMPLES]);
-
-		if (attr->val.n > 0) {
-			float avg = ((float) attr->val.s) / attr->val.n;
-			float stdev = sqrt((((float) attr->val.ss) / attr->val.n) - (avg * avg));
-			if (isnan(stdev))
-				stdev = 0.0f;
-			if (isnan(avg))
-				avg = 0.0f;
-			attr->val.avg = avg;
-			attr->val.stdev = stdev;
-		}
-	}
-
-out:
-	list_add_tail(&attr->list, cb->list);
-	return 0;
-}
-
-
-int
-wprobe_request_data(struct wprobe_iface *dev, const unsigned char *addr)
-{
-	struct wprobe_request_cb cb;
-	struct list_head *attrs;
-	struct nl_msg *msg;
-	int err;
-
-	msg = wprobe_new_msg(dev->ifname, WPROBE_CMD_GET_INFO, true);
-	if (!msg)
-		return -ENOMEM;
-
-	if (addr) {
-		attrs = &dev->link_attr;
-		NLA_PUT(msg, WPROBE_ATTR_MAC, 6, addr);
-	} else {
-		attrs = &dev->global_attr;
-	}
-
-	INIT_LIST_HEAD(&cb.old_list);
-	list_splice_init(attrs, &cb.old_list);
-	cb.list = attrs;
-
-	err = wprobe_send_msg(msg, save_attrdata_handler, &cb);
-	list_splice(&cb.old_list, attrs->prev);
-	return err;
-
-nla_put_failure:
-	nlmsg_free(msg);
-	return -ENOMEM;
-}
-
-
diff --git a/package/wprobe/src/user/wprobe.h b/package/wprobe/src/user/wprobe.h
index c0b4902..706facc 100644
--- a/package/wprobe/src/user/wprobe.h
+++ b/package/wprobe/src/user/wprobe.h
@@ -87,8 +87,19 @@ struct wprobe_link {
 	unsigned char addr[6];
 };
 
+struct wprobe_filter_item {
+	char name[32];
+	uint64_t rx;
+	uint64_t tx;
+};
+
+struct wprobe_iface_ops;
 struct wprobe_iface {
+	const struct wprobe_iface_ops *ops;
+
+	int sockfd;
 	const char *ifname;
+	unsigned int genl_family;
 	char addr[6];
 
 	struct list_head global_attr;
@@ -101,11 +112,23 @@ struct wprobe_iface {
 	int scale_max;
 	int scale_m;
 	int scale_d;
+
+	/* filter */
+	void *filter;
+
+	/* filter_len:
+	 *   set to -1 to drop the current filter
+	 *   automatically reset to 0 after config apply
+	 */
+	int filter_len;
 };
 
+typedef void (*wprobe_filter_cb)(void *arg, const char *group, struct wprobe_filter_item *items, int n_items);
+extern int wprobe_port;
+
 /**
  * wprobe_update_links: get a list of all link partners
- * @ifname: name of the wprobe interface
+ * @dev: wprobe device structure
  * @list: linked list for storing link descriptions
  *
  * when wprobe_update_links is called multiple times, the linked list 
@@ -114,8 +137,16 @@ struct wprobe_iface {
 extern int wprobe_update_links(struct wprobe_iface *dev);
 
 /**
+ * wprobe_dump_filters: dump all layer 2 filter counters
+ * @dev: wprobe device structure
+ * @cb: callback (called once per filter group)
+ * @arg: user argument for the callback
+ */
+extern int wprobe_dump_filters(struct wprobe_iface *dev, wprobe_filter_cb cb, void *arg);
+
+/**
  * wprobe_measure: start a measurement request for all global attributes
- * @ifname: name of the wprobe interface
+ * @dev: wprobe device structure
  *
  * not all attributes are automatically filled with data, since for some
  * it may be desirable to control the sampling interval from user space
@@ -124,7 +155,7 @@ extern int wprobe_update_links(struct wprobe_iface *dev);
 extern int wprobe_measure(struct wprobe_iface *dev);
 
 /**
- * wprobe_get_dev: get device information
+ * wprobe_get_dev: get a handle to a local wprobe device
  * @ifname: name of the wprobe interface
  *
  * queries the wprobe interface for all attributes
@@ -133,6 +164,12 @@ extern int wprobe_measure(struct wprobe_iface *dev);
 extern struct wprobe_iface *wprobe_get_dev(const char *ifname);
 
 /**
+ * wprobe_get_auto: get a handle to a local or remote wprobe device
+ * @arg: pointer to the wprobe device, either <dev> (local) or <host>:<dev> (remote)
+ */
+extern struct wprobe_iface *wprobe_get_auto(const char *arg, char **err);
+
+/**
  * wprobe_get_dev: free all device information
  * @dev: wprobe device structure
  */
@@ -156,4 +193,21 @@ extern int wprobe_apply_config(struct wprobe_iface *dev);
  */
 extern int wprobe_request_data(struct wprobe_iface *dev, const unsigned char *addr);
 
+/**
+ * wprobe_server_init: send a wprobe server init message to a server's client socket
+ * @socket: socket of the connection to the client
+ */
+extern int wprobe_server_init(int socket);
+
+/**
+ * wprobe_server_handle: read a request from the client socket, process it, send the response
+ * @socket: socket of the connection to the client
+ */
+extern int wprobe_server_handle(int socket);
+
+/**
+ * wprobe_server_done: release memory allocated for the server connection
+ */
+extern void wprobe_server_done(void);
+
 #endif