Index: uspace/srv/fs/mfs/mfs_balloc.c
===================================================================
--- uspace/srv/fs/mfs/mfs_balloc.c	(revision d8b47eca6f42cb0337bbfbbd1fcd114ae523a897)
+++ uspace/srv/fs/mfs/mfs_balloc.c	(revision 4c53333ff309112f566af4b6b4e3237101782451)
@@ -128,5 +128,5 @@
 		start_block = 2 + sbi->ibmap_blocks;
 		if (idx > sbi->nzones) {
-			printf(NAME ": Error! Trying to free beyond the" \
+			printf(NAME ": Error! Trying to free beyond the "
 			    "bitmap max size\n");
 			return -1;
@@ -137,5 +137,5 @@
 		start_block = 2;
 		if (idx > sbi->ninodes) {
-			printf(NAME ": Error! Trying to free beyond the" \
+			printf(NAME ": Error! Trying to free beyond the "
 			    "bitmap max size\n");
 			return -1;
Index: uspace/srv/fs/mfs/mfs_dentry.c
===================================================================
--- uspace/srv/fs/mfs/mfs_dentry.c	(revision d8b47eca6f42cb0337bbfbbd1fcd114ae523a897)
+++ uspace/srv/fs/mfs/mfs_dentry.c	(revision 4c53333ff309112f566af4b6b4e3237101782451)
@@ -36,6 +36,6 @@
  *
  * @param mnode		Pointer to the directory node.
- * @param d_info	Pointer to a directory entry structure where the dentry info
- *			will be stored.
+ * @param d_info	Pointer to a directory entry structure where
+ *			the dentry info will be stored.
  * @param index		index of the dentry in the list.
  *
@@ -101,5 +101,5 @@
 /**Write a directory entry on disk.
  *
- * @param d_info Pointer to the directory entry structure to write on disk.
+ * @param d_info The directory entry to write to disk.
  *
  * @return	 EOK on success or a negative error code.
Index: uspace/srv/fs/mfs/mfs_ops.c
===================================================================
--- uspace/srv/fs/mfs/mfs_ops.c	(revision d8b47eca6f42cb0337bbfbbd1fcd114ae523a897)
+++ uspace/srv/fs/mfs/mfs_ops.c	(revision 4c53333ff309112f566af4b6b4e3237101782451)
@@ -88,5 +88,4 @@
 
 /* Hash table interface for open nodes hash table */
-
 typedef struct {
 	service_id_t service_id;
@@ -190,5 +189,6 @@
 		/* This is a V1 or V2 Minix filesystem */
 		magic = sb->s_magic;
-	} else if (check_magic_number(sb3->s_magic, &native, &version, &longnames)) {
+	} else if (check_magic_number(sb3->s_magic, &native,
+	    &version, &longnames)) {
 		/* This is a V3 Minix filesystem */
 		magic = sb3->s_magic;
@@ -568,4 +568,5 @@
 	if (already_open) {
 		mnode = hash_table_get_inst(already_open, struct mfs_node, link);
+
 		*rfn = mnode->fsnode;
 		mnode->refcnt++;
Index: uspace/srv/hid/input/include/sun.h
===================================================================
--- uspace/srv/hid/input/include/sun.h	(revision 4c53333ff309112f566af4b6b4e3237101782451)
+++ uspace/srv/hid/input/include/sun.h	(revision 4c53333ff309112f566af4b6b4e3237101782451)
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2009 Martin Decky
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup kbdgen generic
+ * @brief Sun keyboard virtual port driver.
+ * @ingroup kbd
+ * @{
+ */
+/** @file
+ */
+
+#ifndef KBD_SUN_H_
+#define KBD_SUN_H_
+
+extern int ns16550_port_init(void);
+extern int z8530_port_init(void);
+
+#endif
+
+/**
+ * @}
+ */
Index: uspace/srv/hid/input/port/dummy.c
===================================================================
--- uspace/srv/hid/input/port/dummy.c	(revision 4c53333ff309112f566af4b6b4e3237101782451)
+++ uspace/srv/hid/input/port/dummy.c	(revision 4c53333ff309112f566af4b6b4e3237101782451)
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2009 Jiri Svoboda
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup kbd_port
+ * @brief	Dummy keyboard port driver.
+ * @ingroup  kbd
+ * @{
+ */ 
+/** @file
+ */
+
+#include <kbd_port.h>
+#include <kbd.h>
+
+int kbd_port_init(void)
+{
+	return 0;
+}
+
+void kbd_port_yield(void)
+{
+}
+
+void kbd_port_reclaim(void)
+{
+}
+
+void kbd_port_write(uint8_t data)
+{
+	(void) data;
+}
+
+/** @}
+*/
Index: uspace/srv/hid/input/port/sgcn.c
===================================================================
--- uspace/srv/hid/input/port/sgcn.c	(revision 4c53333ff309112f566af4b6b4e3237101782451)
+++ uspace/srv/hid/input/port/sgcn.c	(revision 4c53333ff309112f566af4b6b4e3237101782451)
@@ -0,0 +1,188 @@
+/*
+ * Copyright (c) 2008 Pavel Rimsky
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup kbd_port
+ * @ingroup  kbd
+ * @{
+ */
+/** @file
+ * @brief SGCN (Serengeti Console) keyboard port driver.
+ */
+
+#include <as.h>
+#include <ddi.h>
+#include <async.h>
+#include <kbd.h>
+#include <kbd_port.h>
+#include <sysinfo.h>
+#include <stdio.h>
+#include <thread.h>
+#include <bool.h>
+#include <errno.h>
+
+#define POLL_INTERVAL  10000
+
+/**
+ * SGCN buffer header. It is placed at the very beginning of the SGCN
+ * buffer.
+ */
+typedef struct {
+	/** hard-wired to "CON" */
+	char magic[4];
+	
+	/** we don't need this */
+	char unused[8];
+	
+	/** offset within the SGCN buffer of the input buffer start */
+	uint32_t in_begin;
+	
+	/** offset within the SGCN buffer of the input buffer end */
+	uint32_t in_end;
+	
+	/** offset within the SGCN buffer of the input buffer read pointer */
+	uint32_t in_rdptr;
+	
+	/** offset within the SGCN buffer of the input buffer write pointer */
+	uint32_t in_wrptr;
+} __attribute__ ((packed)) sgcn_buffer_header_t;
+
+/*
+ * Returns a pointer to the object of a given type which is placed at the given
+ * offset from the console buffer beginning.
+ */
+#define SGCN_BUFFER(type, offset) \
+		((type *) (sram_virt_addr + sram_buffer_offset + (offset)))
+
+/** Returns a pointer to the console buffer header. */
+#define SGCN_BUFFER_HEADER	(SGCN_BUFFER(sgcn_buffer_header_t, 0))
+
+/**
+ * Virtual address mapped to SRAM.
+ */
+static uintptr_t sram_virt_addr;
+
+/**
+ * SGCN buffer offset within SGCN.
+ */
+static uintptr_t sram_buffer_offset;
+
+/* polling thread */
+static void sgcn_thread_impl(void *arg);
+
+static volatile bool polling_disabled = false;
+
+/**
+ * Initializes the SGCN driver.
+ * Maps the physical memory (SRAM) and creates the polling thread. 
+ */
+int kbd_port_init(void)
+{
+	sysarg_t sram_paddr;
+	if (sysinfo_get_value("sram.address.physical", &sram_paddr) != EOK)
+		return -1;
+	
+	sysarg_t sram_size;
+	if (sysinfo_get_value("sram.area.size", &sram_size) != EOK)
+		return -1;
+	
+	if (sysinfo_get_value("sram.buffer.offset", &sram_buffer_offset) != EOK)
+		sram_buffer_offset = 0;
+	
+	sram_virt_addr = (uintptr_t) as_get_mappable_page(sram_size);
+	
+	if (physmem_map((void *) sram_paddr, (void *) sram_virt_addr,
+	    sram_size / PAGE_SIZE, AS_AREA_READ | AS_AREA_WRITE) != 0) {
+		printf("SGCN: uspace driver could not map physical memory.");
+		return -1;
+	}
+	
+	thread_id_t tid;
+	int rc = thread_create(sgcn_thread_impl, NULL, "kbd_poll", &tid);
+	if (rc != 0)
+		return rc;
+	
+	return 0;
+}
+
+void kbd_port_yield(void)
+{
+	polling_disabled = true;
+}
+
+void kbd_port_reclaim(void)
+{
+	polling_disabled = false;
+}
+
+void kbd_port_write(uint8_t data)
+{
+	(void) data;
+}
+
+/**
+ * Handler of the "key pressed" event. Reads codes of all the pressed keys from
+ * the buffer. 
+ */
+static void sgcn_key_pressed(void)
+{
+	char c;
+	
+	uint32_t begin = SGCN_BUFFER_HEADER->in_begin;
+	uint32_t end = SGCN_BUFFER_HEADER->in_end;
+	uint32_t size = end - begin;
+	
+	volatile char *buf_ptr = (volatile char *)
+		SGCN_BUFFER(char, SGCN_BUFFER_HEADER->in_rdptr);
+	volatile uint32_t *in_wrptr_ptr = &(SGCN_BUFFER_HEADER->in_wrptr);
+	volatile uint32_t *in_rdptr_ptr = &(SGCN_BUFFER_HEADER->in_rdptr);
+	
+	while (*in_rdptr_ptr != *in_wrptr_ptr) {
+		c = *buf_ptr;
+		*in_rdptr_ptr = (((*in_rdptr_ptr) - begin + 1) % size) + begin;
+		buf_ptr = (volatile char *)
+			SGCN_BUFFER(char, SGCN_BUFFER_HEADER->in_rdptr);
+		kbd_push_scancode(c);
+	}
+}
+
+/**
+ * Thread to poll SGCN for keypresses.
+ */
+static void sgcn_thread_impl(void *arg)
+{
+	(void) arg;
+
+	while (1) {
+		if (polling_disabled == false)
+			sgcn_key_pressed();
+		usleep(POLL_INTERVAL);
+	}
+}
+
+/** @}
+ */
Index: uspace/srv/hid/input/port/sun.c
===================================================================
--- uspace/srv/hid/input/port/sun.c	(revision 4c53333ff309112f566af4b6b4e3237101782451)
+++ uspace/srv/hid/input/port/sun.c	(revision 4c53333ff309112f566af4b6b4e3237101782451)
@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2009 Martin Decky
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup kbd_port
+ * @ingroup  kbd
+ * @{
+ */
+/** @file
+ * @brief Sun keyboard virtual port driver.
+ */
+
+#include <kbd.h>
+#include <kbd_port.h>
+#include <sun.h>
+#include <sysinfo.h>
+#include <errno.h>
+#include <bool.h>
+
+/** Sun keyboard virtual port driver.
+ *
+ * This is a virtual port driver which can use
+ * both ns16550_port_init and z8530_port_init
+ * according to the information passed from the
+ * kernel. This is just a temporal hack.
+ *
+ */
+int kbd_port_init(void)
+{
+	sysarg_t z8530;
+	if (sysinfo_get_value("kbd.type.z8530", &z8530) != EOK)
+		z8530 = false;
+	
+	sysarg_t ns16550;
+	if (sysinfo_get_value("kbd.type.ns16550", &ns16550) != EOK)
+		ns16550 = false;
+	
+	if (z8530) {
+		if (z8530_port_init() == 0)
+			return 0;
+	}
+	
+	if (ns16550) {
+		if (ns16550_port_init() == 0)
+			return 0;
+	}
+	
+	return -1;
+}
+
+void kbd_port_yield(void)
+{
+}
+
+void kbd_port_reclaim(void)
+{
+}
+
+void kbd_port_write(uint8_t data)
+{
+	(void) data;
+}
+
+/** @}
+*/
Index: uspace/srv/hid/input/port/z8530.c
===================================================================
--- uspace/srv/hid/input/port/z8530.c	(revision 4c53333ff309112f566af4b6b4e3237101782451)
+++ uspace/srv/hid/input/port/z8530.c	(revision 4c53333ff309112f566af4b6b4e3237101782451)
@@ -0,0 +1,117 @@
+/*
+ * Copyright (c) 2006 Martin Decky
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup kbd_port
+ * @ingroup  kbd
+ * @{
+ */
+/** @file
+ * @brief Z8530 keyboard port driver.
+ */
+
+#include <ipc/irc.h>
+#include <async.h>
+#include <async_obsolete.h>
+#include <sysinfo.h>
+#include <kbd.h>
+#include <kbd_port.h>
+#include <sun.h>
+#include <sys/types.h>
+#include <ddi.h>
+#include <errno.h>
+
+#define CHAN_A_STATUS  4
+#define CHAN_A_DATA    6
+
+#define RR0_RCA  1
+
+static irq_cmd_t z8530_cmds[] = {
+	{
+		.cmd = CMD_PIO_READ_8,
+		.addr = (void *) 0,     /* Will be patched in run-time */
+		.dstarg = 1
+	},
+	{
+		.cmd = CMD_BTEST,
+		.value = RR0_RCA,
+		.srcarg = 1,
+		.dstarg = 3
+	},
+	{
+		.cmd = CMD_PREDICATE,
+		.value = 2,
+		.srcarg = 3
+	},
+	{
+		.cmd = CMD_PIO_READ_8,
+		.addr = (void *) 0,     /* Will be patched in run-time */
+		.dstarg = 2
+	},
+	{
+		.cmd = CMD_ACCEPT
+	}
+};
+	
+irq_code_t z8530_kbd = {
+	sizeof(z8530_cmds) / sizeof(irq_cmd_t),
+	z8530_cmds
+};
+
+static void z8530_irq_handler(ipc_callid_t iid, ipc_call_t *call);
+
+int z8530_port_init(void)
+{
+	sysarg_t kaddr;
+	if (sysinfo_get_value("kbd.address.kernel", &kaddr) != EOK)
+		return -1;
+	
+	sysarg_t inr;
+	if (sysinfo_get_value("kbd.inr", &inr) != EOK)
+		return -1;
+	
+	z8530_cmds[0].addr = (void *) kaddr + CHAN_A_STATUS;
+	z8530_cmds[3].addr = (void *) kaddr + CHAN_A_DATA;
+	
+	async_set_interrupt_received(z8530_irq_handler);
+	register_irq(inr, device_assign_devno(), inr, &z8530_kbd);
+	
+	return 0;
+}
+
+static void z8530_irq_handler(ipc_callid_t iid, ipc_call_t *call)
+{
+	int scan_code = IPC_GET_ARG2(*call);
+	kbd_push_scancode(scan_code);
+	
+	if (irc_service)
+		async_obsolete_msg_1(irc_phone, IRC_CLEAR_INTERRUPT,
+		    IPC_GET_IMETHOD(*call));
+}
+
+/** @}
+ */
Index: uspace/srv/net/inetsrv/inet_util.c
===================================================================
--- uspace/srv/net/inetsrv/inet_util.c	(revision 4c53333ff309112f566af4b6b4e3237101782451)
+++ uspace/srv/net/inetsrv/inet_util.c	(revision 4c53333ff309112f566af4b6b4e3237101782451)
@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2012 Jiri Svoboda
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup inet
+ * @{
+ */
+/**
+ * @file
+ * @brief
+ */
+
+#include <assert.h>
+#include <bitops.h>
+#include <sys/types.h>
+#include "inet_util.h"
+
+uint32_t inet_netmask(int bits)
+{
+	assert(bits >= 0);
+	assert(bits < 32);
+
+	if (bits == 0)
+		return 0;
+	else
+		return BIT_RANGE(uint32_t, 31, 31 - (bits - 1));
+}
+
+/** @}
+ */
Index: uspace/srv/net/inetsrv/inet_util.h
===================================================================
--- uspace/srv/net/inetsrv/inet_util.h	(revision 4c53333ff309112f566af4b6b4e3237101782451)
+++ uspace/srv/net/inetsrv/inet_util.h	(revision 4c53333ff309112f566af4b6b4e3237101782451)
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2012 Jiri Svoboda
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup inet
+ * @{
+ */
+/**
+ * @file
+ * @brief
+ */
+
+#ifndef INET_UTIL_H_
+#define INET_UTIL_H_
+
+#include <sys/types.h>
+
+uint32_t inet_netmask(int bits);
+
+#endif
+
+/** @}
+ */
Index: uspace/srv/net/tcp/tcp_header.h
===================================================================
--- uspace/srv/net/tcp/tcp_header.h	(revision 4c53333ff309112f566af4b6b4e3237101782451)
+++ uspace/srv/net/tcp/tcp_header.h	(revision 4c53333ff309112f566af4b6b4e3237101782451)
@@ -0,0 +1,163 @@
+/*
+ * Copyright (c) 2009 Lukas Mejdrech
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup tcp
+ * @{
+ */
+
+/** @file
+ * TCP header definition.
+ * Based on the RFC 793.
+ */
+
+#ifndef NET_TCP_HEADER_H_
+#define NET_TCP_HEADER_H_
+
+#include <sys/types.h>
+
+/** TCP header size in bytes. */
+#define TCP_HEADER_SIZE				sizeof(tcp_header_t)
+
+/** Returns the actual TCP header length in bytes.
+ * @param[in] header The TCP packet header.
+ */
+#define TCP_HEADER_LENGTH(header)		(GET_TCP_HEADER_LENGTH(header) * 4U)
+
+/** Returns the TCP header length.
+ * @param[in] length The TCP header length in bytes.
+ */
+#define TCP_COMPUTE_HEADER_LENGTH(length)	((uint8_t) ((length) / 4U))
+
+/** Type definition of the transmission datagram header.
+ * @see tcp_header
+ */
+typedef struct tcp_header tcp_header_t;
+
+/** Type definition of the transmission datagram header option.
+ * @see tcp_option
+ */
+typedef struct tcp_option tcp_option_t;
+
+/** Type definition of the Maximum segment size TCP option. */
+typedef struct tcp_max_segment_size_option tcp_max_segment_size_option_t;
+
+/** Transmission datagram header. */
+struct tcp_header {
+	uint16_t source_port;
+	uint16_t destination_port;
+	uint32_t sequence_number;
+	uint32_t acknowledgement_number;
+
+	uint8_t hlr; /* header length, reserved1 */
+
+#define GET_TCP_HEADER_LENGTH(header) \
+	(((header)->hlr & 0xf0) >> 4)
+#define SET_TCP_HEADER_LENGTH(header, length) \
+	((header)->hlr = \
+	 ((length & 0x0f) << 4) | ((header)->hlr & 0x0f))
+
+#define GET_TCP_HEADER_RESERVED1(header) \
+	((header)->hlr & 0x0f)
+#define SET_TCP_HEADER_RESERVED1(header, reserved1) \
+	((header)->hlr = \
+	 (reserved1 & 0x0f) | ((header)->hlr & 0xf0))
+
+	/* reserved2, urgent, acknowledge, push, reset, synchronize, finalize */
+	uint8_t ruaprsf;  
+
+#define GET_TCP_HEADER_RESERVED2(header) \
+	(((header)->ruaprsf & 0xc0) >> 6)
+#define SET_TCP_HEADER_RESERVED2(header, reserved2) \
+	((header)->ruaprsf = \
+	 ((reserved2 & 0x03) << 6) | ((header)->ruaprsf & 0x3f))
+
+#define GET_TCP_HEADER_URGENT(header) \
+	(((header)->ruaprsf & 0x20) >> 5)
+#define SET_TCP_HEADER_URGENT(header, urgent) \
+	((header)->ruaprsf = \
+	 ((urgent & 0x01) << 5) | ((header)->ruaprsf & 0xdf))
+
+#define GET_TCP_HEADER_ACKNOWLEDGE(header) \
+	(((header)->ruaprsf & 0x10) >> 4)
+#define SET_TCP_HEADER_ACKNOWLEDGE(header, acknowledge) \
+	((header)->ruaprsf = \
+	 ((acknowledge & 0x01) << 4) | ((header)->ruaprsf & 0xef))
+
+#define GET_TCP_HEADER_PUSH(header) \
+	(((header)->ruaprsf & 0x08) >> 3)
+#define SET_TCP_HEADER_PUSH(header, push) \
+	((header)->ruaprsf = \
+	 ((push & 0x01) << 3) | ((header)->ruaprsf & 0xf7))
+
+#define GET_TCP_HEADER_RESET(header) \
+	(((header)->ruaprsf & 0x04) >> 2)
+#define SET_TCP_HEADER_RESET(header, reset) \
+	((header)->ruaprsf = \
+	 ((reset & 0x01) << 2) | ((header)->ruaprsf & 0xfb))
+
+#define GET_TCP_HEADER_SYNCHRONIZE(header) \
+	(((header)->ruaprsf & 0x02) >> 1)
+#define SET_TCP_HEADER_SYNCHRONIZE(header, synchronize) \
+	((header)->ruaprsf = \
+	 ((synchronize & 0x01) << 1) | ((header)->ruaprsf & 0xfd))
+
+#define GET_TCP_HEADER_FINALIZE(header) \
+	((header)->ruaprsf & 0x01)
+#define SET_TCP_HEADER_FINALIZE(header, finalize) \
+	((header)->ruaprsf = \
+	 (finalize & 0x01) | ((header)->ruaprsf & 0xfe))
+
+	uint16_t window;
+	uint16_t checksum;
+	uint16_t urgent_pointer;
+} __attribute__ ((packed));
+
+/** Transmission datagram header option. */
+struct tcp_option {
+	/** Option type. */
+	uint8_t type;
+	/** Option length. */
+	uint8_t length;
+};
+
+/** Maximum segment size TCP option. */
+struct tcp_max_segment_size_option {
+	/** TCP option.
+	 * @see TCPOPT_MAX_SEGMENT_SIZE
+	 * @see TCPOPT_MAX_SEGMENT_SIZE_LENGTH
+	 */
+	tcp_option_t option;
+	
+	/** Maximum segment size in bytes. */
+	uint16_t max_segment_size;
+} __attribute__ ((packed));
+
+#endif
+
+/** @}
+ */
