move a few unmaintained packages from trunk to /packages

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@33634 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 0 insertions, 1478 deletions

diff --git a/package/siit/src/siit.c b/package/siit/src/siit.c
deleted file mode 100644
index 5362c1daa..000000000
--- a/package/siit/src/siit.c
+++ /dev/null
@@ -1,1478 +0,0 @@
-/*
- * siit.c: the Stateless IP/ICMP Translator (SIIT) module for Linux.
- *
- *
- */
-
-#include <linux/version.h>
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,33))
-#include <generated/autoconf.h>
-#else
-#include <linux/autoconf.h>
-#endif
-#include <linux/module.h>
-#include <linux/sched.h>
-#include <linux/kernel.h>       /* printk() */
-#include <linux/slab.h>
-
-#include <linux/errno.h>        /* error codes */
-#include <linux/types.h>        /* size_t */
-#include <linux/interrupt.h>    /* mark_bh */
-#include <linux/random.h>
-#include <linux/in.h>
-#include <linux/netdevice.h>    /* struct device, and other headers */
-#include <linux/etherdevice.h>  /* eth_type_trans */
-#include <net/ip.h>             /* struct iphdr */
-#include <net/icmp.h>           /* struct icmphdr */
-#include <net/ipv6.h>
-#include <net/udp.h>
-#include <linux/skbuff.h>
-#include <linux/in6.h>
-#include <linux/init.h>
-#include <asm/uaccess.h>
-#include <asm/checksum.h>
-#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0)
-#include <net/ip6_checksum.h>
-#endif
-#include <linux/in6.h>
-#include "siit.h"
-
-MODULE_AUTHOR("Dmitriy Moscalev, Grigory Klyuchnikov, Felix Fietkau");
-
-/*
- * If tos_ignore_flag != 0, we don't copy TOS and Traffic Class
- * from origin paket and set it to 0
- */
-int tos_ignore_flag = 0;
-
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
-static inline void
-skb_reset_mac_header(struct sk_buff *skb)
-{
-	skb->mac.raw=skb->data;
-}
-
-static struct net_device_stats *
-siit_get_stats(struct net_device *dev)
-{
-	return netdev_priv(dev);
-}
-
-static inline void random_ether_addr(u8 *addr)
-{
-	get_random_bytes (addr, ETH_ALEN);
-	addr [0] &= 0xfe;	/* clear multicast bit */
-	addr [0] |= 0x02;	/* set local assignment bit (IEEE802) */
-}
-
-
-#define siit_stats(_dev) ((struct net_device_stats *)netdev_priv(_dev))
-#else
-#define siit_stats(_dev) (&(_dev)->stats)
-#endif
-
-/*
- * The Utility  stuff
- */
-
-#ifdef SIIT_DEBUG
-/* print dump bytes (data point data area sizeof len and message
- * before dump.
- */
-static int siit_print_dump(char *data, int len, char *message)
-{
-	int i;
-	int j = 0, k = 1;
-
-	len = len > BUFF_SIZE ? BUFF_SIZE : len;
-	printk("%s:\n", message);
-	for (i=0; i < len; i++, k++) {
-		if( i == len-1 || k == 16) {
-			printk("%02x\n", (~(~0 << 8) & *(data+i)));
-			j = 0;
-			k = 0;
-		}
-		else if (j) {
-			printk("%02x ", (~(~0 << 8) & *(data+i)));
-			j--;
-		}
-		else {
-			printk("%02x", (~(~0 << 8) & *(data+i)));
-			j++;
-		}
-	}
-	return 0;
-}
-#endif
-
-/*
- * Open and close
- */
-static int siit_open(struct net_device *dev)
-{
-	netif_start_queue(dev);
-	return 0;
-}
-
-
-static int siit_release(struct net_device *dev)
-{
-	netif_stop_queue(dev); /* can't transmit any more */
-	return 0;
-}
-
-/*
- * Translation IPv4 to IPv6 stuff
- *
- * ip4_ip6 (src, len, dst, include_flag)
- *
- * where
- * src - buffer with original IPv4 packet,
- * len - size of original packet,
- * dst - new buffer for IPv6 packet,
- * include_flag - if = 1, dst point to IPv4 packet that is ICMP error
- *                included IP packet, else = 0
- */
-
-static int ip4_ip6(char *src, int len, char *dst, int include_flag)
-{
-	struct iphdr *ih4 = (struct iphdr *) src; /* point to current IPv4 header struct */
-	struct icmphdr *icmp_hdr;   /* point to current ICMPv4 header struct */
-	struct udphdr *udp_hdr;     /* point to current IPv4 UDP header struct */
-
-	struct ipv6hdr *ih6 = (struct ipv6hdr *) dst; /* point to current IPv6 header struct */
-	struct frag_hdr *ih6_frag = (struct frag_hdr *)(dst+sizeof(struct ipv6hdr));
-										      /* point to current IPv6 fragment header struct */
-	struct icmp6hdr *icmp6_hdr; /* point to current ICMPv6 header */
-
-	int hdr_len = (int)(ih4->ihl * 4); /* IPv4 header length */
-	int icmp_len;               /* ICMPv4 packet length */
-	int plen;                   /* payload length */
-
-	unsigned int csum;          /* need to calculate ICMPv6 and UDP checksum */
-	int fl_csum = 0;            /* flag to calculate UDP checksum */
-	int icmperr = 1;            /* flag to indicate ICMP error message and to need
-								   translate ICMP included IP packet */
-	int fr_flag = 0;            /* fragment flag, if = 0 - don't add
-								   fragment header */
-	__u16 new_tot_len;          /* need to calculate IPv6 total length */
-	__u8 new_nexthdr;           /* next header code */
-	__u16 icmp_ptr = 0;         /* Pointer field in ICMP_PARAMETERPROB */
-
-#ifdef SIIT_DEBUG              /* print IPv4 header dump */
-	siit_print_dump(src, hdr_len, "siit: ip4_ip6() (in) ip4 header dump");
-#endif
-
-	/* If DF == 1 && MF == 0 && Fragment Offset == 0
-	 * or this packet is ICMP included IP packet
-	 * we don't need fragment header */
-	if (ntohs(ih4->frag_off) == IP_DF || include_flag ) {
-		/* not fragment and we need not to add Fragment
-		 * Header to IPv6 packet. */
-		/* total length = total length from IPv4 packet */
-		new_tot_len = ntohs(ih4->tot_len);
-
-		if (ih4->protocol == IPPROTO_ICMP)
-			new_nexthdr = NEXTHDR_ICMP;
-		else
-			new_nexthdr = ih4->protocol;
-	}
-	else {
-		/* need to add Fragment Header */
-		fr_flag = 1;
-		/* total length = total length from IPv4 packet +
-		   length of Fragment Header */
-		new_tot_len = ntohs(ih4->tot_len) + sizeof(struct frag_hdr);
-		/* IPv6 Header NextHeader = NEXTHDR_FRAGMENT */
-		new_nexthdr = NEXTHDR_FRAGMENT;
-		/* Fragment Header NextHeader copy from IPv4 packet */
-		if (ih4->protocol == IPPROTO_ICMP)
-			ih6_frag->nexthdr = NEXTHDR_ICMP;
-		else
-			ih6_frag->nexthdr = ih4->protocol;
-
-		/* copy frag offset from IPv4 packet */
-		ih6_frag->frag_off = htons((ntohs(ih4->frag_off) & IP_OFFSET) << 3);
-		/* copy MF flag from IPv4 packet */
-		ih6_frag->frag_off = htons((ntohs(ih6_frag->frag_off) |
-									((ntohs(ih4->frag_off) & IP_MF) >> 13)));
-		/* copy Identification field from IPv4 packet */
-		ih6_frag->identification = htonl(ntohs(ih4->id));
-		/* reserved field initialized to zero */
-		ih6_frag->reserved = 0;
-	}
-
-	/* Form rest IPv6 fields */
-
-	/*
-	 * At this point we need to add checking of unxpired source
-	 * route optin and if it is, send ICMPv4 "destination
-	 * unreacheble/source route failes" Type 3/Code 5 and
-	 * drop packet. (NOT RELEASED YET)
-	 */
-
-	/* IP version = 6 */
-	ih6->version = 6;
-
-	if (tos_ignore_flag) {
-		ih6->priority = 0;
-		ih6->flow_lbl[0] = 0;
-	} else {
-		ih6->priority = (ih4->tos & 0xf0) >> 4;
-		ih6->flow_lbl[0] = (ih4->tos & 0x0f) << 4;
-	}
-	ih6->flow_lbl[1] = 0;
-	ih6->flow_lbl[2] = 0;
-
-	/* Hop Limit = IPv4 TTL */
-	ih6->hop_limit = ih4->ttl;
-
-	/* Translate source destination addresses,
-	   for IPv6 host it's IPv4-translated IPv6 address,
-	   for IPv4 host it's IPv4-mapped IPv6 address
-
-	   !!WARNING!! Instead IPv4-mapped IPv6 addresses we use addreesses
-	   with unused prefix ::ffff:ffff:0:0/96, because KAME implementation
-	   doesn't support IPv4-mapped addresses in IPv6 packets and discard them.
-
-	*/
-
-	if (include_flag) {
-		/*
-		   It's ICMP included IP packet and there is a diffirence
-		   in src/dst addresses then src/dst in normal direction
-		 */
-
-		/*
-		   Source address
-		   is IPv4-translated IPv6 address because packet traveled
-		   from IPv6 to IPv4 area
-		*/
-		ih6->saddr.in6_u.u6_addr32[0] = 0;
-		ih6->saddr.in6_u.u6_addr32[1] = 0;
-		ih6->saddr.in6_u.u6_addr32[2] = htonl(TRANSLATED_PREFIX); /* to network order bytes */
-		ih6->saddr.in6_u.u6_addr32[3] = ih4->saddr;
-
-		/*
-		   Destination address
-		   is IPv4-mapped address (but it's not IPv4- mapped, we use
-		   prefix ::ffff:ffff:0:0/96
-		 */
-		ih6->daddr.in6_u.u6_addr32[0] = 0;
-		ih6->daddr.in6_u.u6_addr32[1] = 0;
-		ih6->daddr.in6_u.u6_addr32[2] = htonl(MAPPED_PREFIX); /* to network order bytes */
-		ih6->daddr.in6_u.u6_addr32[3] = ih4->daddr;
-	}
-	else {
-
-		/*
-		   This is normal case (packet isn't included IP packet)
-
-		   Source address
-		   is IPv4-mapped address (but it's not IPv4- mapped, we use
-		   prefix ::ffff:ffff:0:0/96)
-		*/
-		ih6->saddr.in6_u.u6_addr32[0] = 0;
-		ih6->saddr.in6_u.u6_addr32[1] = 0;
-		ih6->saddr.in6_u.u6_addr32[2] = htonl(MAPPED_PREFIX); /* to network order bytes */
-		ih6->saddr.in6_u.u6_addr32[3] = ih4->saddr;
-
-		/* Destination address
-		   is is IPv4-translated IPv6 address
-		 */
-		ih6->daddr.in6_u.u6_addr32[0] = 0;
-		ih6->daddr.in6_u.u6_addr32[1] = 0;
-		ih6->daddr.in6_u.u6_addr32[2] = htonl(TRANSLATED_PREFIX); /* to network order bytes */
-		ih6->daddr.in6_u.u6_addr32[3] = ih4->daddr;
-	}
-
-	/* Payload Length */
-	plen = new_tot_len - hdr_len; /* Payload length = IPv4 total len - IPv4 header len */
-	ih6->payload_len = htons(plen);
-
-	/* Next Header */
-	ih6->nexthdr = new_nexthdr; /* Next Header */
-
-	/* Process ICMP protocols data */
-
-	switch (ih4->protocol) {
-	case IPPROTO_ICMP:
-		if ( (ntohs(ih4->frag_off) & IP_OFFSET) != 0 || (ntohs(ih4->frag_off) & IP_MF) != 0 ) {
-			PDEBUG("ip4_ip6(): don't translate ICMPv4 fragments - packet dropped.\n");
-			return -1;
-		}
-
-		icmp_hdr = (struct icmphdr *) (src+hdr_len); /* point to ICMPv4 header */
-		csum = 0;
-		icmp_len =  ntohs(ih4->tot_len) - hdr_len; /* ICMPv4 packet length */
-		icmp6_hdr = (struct icmp6hdr *)(dst+sizeof(struct ipv6hdr)
-									    +fr_flag*sizeof(struct frag_hdr)); /* point to ICMPv6 header */
-
-		if (include_flag) {
-			/* ICMPv4 packet cannot be included in ICMPv4 Error message */
-			/* !!! May be it's WRONG !!! ICMPv4 QUERY packet can be included
-			   in ICMPv4 Error message */
-			PDEBUG("ip4_ip6(): It's included ICMPv4 in ICMPv4 Error message - packet dropped.\n");
-			return -1;
-		}
-
-		/* Check ICMPv4 Type field */
-		switch (icmp_hdr->type) {
-		/* ICMP Error messages */
-		/* Destination Unreachable (Type 3) */
-		case ICMP_DEST_UNREACH:
-			icmp6_hdr->icmp6_type = ICMPV6_DEST_UNREACH; /* to Type 1 */
-			icmp6_hdr->icmp6_unused = 0;
-			switch (icmp_hdr->code)
-			{
-			case ICMP_NET_UNREACH: /* Code 0 */
-			case ICMP_HOST_UNREACH: /* Code 1 */
-			case ICMP_SR_FAILED: /* Code 5 */
-			case ICMP_NET_UNKNOWN: /* Code 6 */
-			case ICMP_HOST_UNKNOWN: /* Code 7 */
-			case ICMP_HOST_ISOLATED: /* Code 8 */
-			case ICMP_NET_UNR_TOS: /* Code 11 */
-			case ICMP_HOST_UNR_TOS: /* Code 12 */
-				icmp6_hdr->icmp6_code = ICMPV6_NOROUTE; /* to Code 0 */
-				break;
-			case ICMP_PROT_UNREACH: /* Code 2 */
-				icmp6_hdr->icmp6_type = ICMPV6_PARAMPROB; /* to Type 4 */
-				icmp6_hdr->icmp6_code = ICMPV6_UNK_NEXTHDR; /* to Code 1 */
-				/* Set pointer filed to 6, it's octet offset IPv6 Next Header field */
-				icmp6_hdr->icmp6_pointer = htonl(6);
-				break;
-			case ICMP_PORT_UNREACH: /* Code 3 */
-				icmp6_hdr->icmp6_code = ICMPV6_PORT_UNREACH; /* to Code 4 */
-				break;
-			case ICMP_FRAG_NEEDED: /* Code 4 */
-				icmp6_hdr->icmp6_type = ICMPV6_PKT_TOOBIG; /* to Type 2 */
-				icmp6_hdr->icmp6_code = 0;
-				/* Correct MTU  */
-				if (icmp_hdr->un.frag.mtu == 0)
-					/* we use minimum MTU for IPv4 PMTUv4 RFC1191, section 5;
-					   IPv6 implementation wouldn't accept Path MTU < 1280,
-					   but it records info correctly to always include
-					   a fragment header */
-					icmp6_hdr->icmp6_mtu = htonl(576);
-				else
-					/* needs to adjusted for difference between IPv4/IPv6 headers
-					 * SIIT RFC2765, section 3.3,
-					 * we assume that difference is 20 bytes */
-					icmp6_hdr->icmp6_mtu = htonl(ntohs(icmp_hdr->un.frag.mtu)+IP4_IP6_HDR_DIFF);
-
-				break;
-			case ICMP_NET_ANO: /* Code 9 */
-			case ICMP_HOST_ANO: /* Code 10 */
-				icmp6_hdr->icmp6_code = ICMPV6_ADM_PROHIBITED; /* to Code 1 */
-				break;
-			default: /* discard any other Code */
-				PDEBUG("ip4_ip6(): Unknown ICMPv4 Type %d Code %d - packet dropped.\n",
-					   ICMP_DEST_UNREACH, icmp_hdr->code);
-				return -1;
-			}
-			break;
-			/* Time Exceeded (Type 11) */
-		case ICMP_TIME_EXCEEDED:
-			icmp6_hdr->icmp6_type = ICMPV6_TIME_EXCEED;
-			icmp6_hdr->icmp6_code = icmp_hdr->code;
-			break;
-			/* Parameter Problem (Type 12) */
-		case ICMP_PARAMETERPROB:
-			icmp6_hdr->icmp6_type = ICMPV6_PARAMPROB;
-			icmp6_hdr->icmp6_code = icmp_hdr->code;
-
-			icmp_ptr = ntohs(icmp_hdr->un.echo.id) >> 8;
-			switch (icmp_ptr) {
-			case 0:
-				icmp6_hdr->icmp6_pointer = 0; /* IPv4 Version -> IPv6 Version */
-				break;
-			case 2:
-				icmp6_hdr->icmp6_pointer = __constant_htonl(4); /* IPv4 length -> IPv6 Payload Length */
-				break;
-			case 8:
-				icmp6_hdr->icmp6_pointer = __constant_htonl(7); /* IPv4 TTL -> IPv6 Hop Limit */
-				break;
-			case 9:
-				icmp6_hdr->icmp6_pointer = __constant_htonl(6); /* IPv4 Protocol -> IPv6 Next Header */
-				break;
-			case 12:
-				icmp6_hdr->icmp6_pointer = __constant_htonl(8); /* IPv4 Src Addr -> IPv6 Src Addr */
-				break;
-			case 16:
-				icmp6_hdr->icmp6_pointer = __constant_htonl(24); /* IPv4 Dst Addr -> IPv6 Dst Addr */
-				break;
-			default:
-				icmp6_hdr->icmp6_pointer = 0xffffffff; /* set to all ones in any other cases */
-				break;
-			}
-			break;
-		case ICMP_ECHO:
-			icmperr = 0;
-			icmp6_hdr->icmp6_type = ICMPV6_ECHO_REQUEST;
-			icmp6_hdr->icmp6_code = 0;
-			/* Copy rest ICMP data to new IPv6 packet without changing */
-			memcpy(((char *)icmp6_hdr)+4, ((char *)icmp_hdr)+4, len - hdr_len - 4);
-			break;
-
-		case ICMP_ECHOREPLY:
-			icmperr = 0;
-			icmp6_hdr->icmp6_type = ICMPV6_ECHO_REPLY;
-			icmp6_hdr->icmp6_code = 0;
-			/* Copy rest ICMP data to new IPv6 packet without changing */
-			memcpy(((char *)icmp6_hdr)+4, ((char *)icmp_hdr)+4, len - hdr_len - 4);
-			break;
-
-			/* Discard any other ICMP messages */
-		default:
-			PDEBUG("ip4_ip6(): Unknown ICMPv4 packet Type %x - packet dropped.\n", icmp_hdr->type);
-			return -1;
-		}
-
-		/* Now if it's ICMPv4 Error message we must translate included IP packet */
-
-		if (icmperr) {
-			/* Call our ip4_ip6() to translate included IP packet */
-			if (ip4_ip6(src+hdr_len+sizeof(struct icmphdr), len - hdr_len - sizeof(struct icmphdr),
-						dst+sizeof(struct ipv6hdr)+fr_flag*sizeof(struct frag_hdr)
-						+sizeof(struct icmp6hdr), 1) == -1) {
-				PDEBUG("ip4_ip6(): Uncorrect translation of ICMPv4 Error message - packet dropped.\n");
-				return -1;
-			}
-			/* correct ICMPv6 packet length for diffirence between IPv4 and IPv6 headers
-			   in included IP packet
-			   */
-			icmp_len += 20;
-			/* and correct Payload length for diffirence between IPv4 and IPv6 headers */
-			plen += 20;
-			ih6->payload_len = htons(plen);
-		}
-
-		/* Calculate ICMPv6 checksum */
-
-		icmp6_hdr->icmp6_cksum = 0;
-		csum = 0;
-
-		csum = csum_partial((u_char *)icmp6_hdr, icmp_len, csum);
-		icmp6_hdr->icmp6_cksum = csum_ipv6_magic(&ih6->saddr, &ih6->daddr, icmp_len,
-									         IPPROTO_ICMPV6, csum);
-		break;
-
-	/* Process TCP protocols data */
-	case IPPROTO_TCP:
-		/* Copy TCP data to new IPv6 packet without changing */
-		memcpy(dst+sizeof(struct ipv6hdr)+fr_flag*sizeof(struct frag_hdr),
-				   src+hdr_len, len - hdr_len);
-		break;
-
-	/* Process UDP protocols data */
-	case IPPROTO_UDP:
-		udp_hdr = (struct udphdr *)(src+hdr_len);
-		if ((ntohs(ih4->frag_off) & IP_OFFSET) == 0) {
-			if ((ntohs(ih4->frag_off) & IP_MF) != 0) {
-				/* It's a first fragment */
-				if (udp_hdr->check == 0) {
-					/* System management event */
-					printk("siit: First fragment of UDP with zero checksum - packet droped\n");
-					printk("siit: addr: %x src port: %d dst port: %d\n",
-						   htonl(ih4->saddr), htons(udp_hdr->source), htons(udp_hdr->dest));
-					return -1;
-				}
-			}
-			else if (udp_hdr->check == 0)
-				fl_csum = 1;
-		}
-
-		/* Copy UDP data to new IPv6 packet */
-		udp_hdr = (struct udphdr *)(dst+sizeof(struct ipv6hdr)
-									+ fr_flag*sizeof(struct frag_hdr));
-		memcpy((char *)udp_hdr, src+hdr_len, len - hdr_len);
-
-		/* Calculate UDP checksum if UDP checksum in IPv4 packet was ZERO
-		   and if it isn't included IP packet
-		 */
-		if (fl_csum && (!include_flag)) {
-			udp_hdr->check = 0;
-			csum = 0;
-			csum = csum_partial((unsigned char *)udp_hdr, plen - fr_flag*sizeof(struct frag_hdr), csum);
-			udp_hdr->check = csum_ipv6_magic(&ih6->saddr, &ih6->daddr, plen -
-										     fr_flag*sizeof(struct frag_hdr), IPPROTO_UDP, csum);
-		}
-		break;
-
-	/* Discard packets with any other protocol */
-	default:
-		PDEBUG("ip4_ip6(): Unknown upper protocol - packet dropped.\n");
-		return -1;
-	}
-
-#ifdef SIIT_DEBUG
-	siit_print_dump(dst, sizeof(struct ipv6hdr), "siit: ip4_ip6(): (out) ipv6 header dump");
-#endif
-
-	return 0;
-}
-
-/*
- * Translation IPv6 to IPv4 stuff
- *
- * ip6_ip4(src, len, dst, include_flag)
- *
- * where
- * src - buffer with original IPv6 packet,
- * len - size of original packet,
- * dst - new buffer for IPv4 packet,
- * include_flag - if = 1, dst point to IPv6 packet that is ICMP error
- *                included IP packet, else = 0
- *
- */
-
-static int ip6_ip4(char *src, int len, char *dst, int include_flag)
-{
-	struct ipv6hdr *ip6_hdr;    /* point to current IPv6 header struct */
-	struct iphdr *ip_hdr;       /* point to current IPv4 header struct */
-	int opts_len = 0;           /* to sum Option Headers length */
-	int icmperr = 1;            /* if = 1, indicate that packet is ICMP Error message, else = 0 */
-	int ntot_len = 0;           /* to calculate IPv6 Total Length field */
-	int real_len;
-	int len_delta;
-	int ip6_payload_len;
-	int inc_opts_len = 0;       /* to sum Option Headers length in ICMP included IP packet */
-	__u8 next_hdr;              /* Next Header */
-
-#ifdef SIIT_DEBUG
-	siit_print_dump(src, sizeof(struct ipv6hdr), "siit: ip6_ip4(): (in) ipv6 header dump");
-#endif
-
-	if ( (len_delta = len - sizeof(struct ipv6hdr)) >= 0)
-	{
-		ip6_hdr = (struct ipv6hdr *)src;
-		ip_hdr = (struct iphdr *)dst;
-
-		real_len = sizeof(struct iphdr);
-
-		/* Check validation of Saddr & Daddr? is a packet to fall under our translation? */
-		if (include_flag) { /* It's ICMP included IP packet,
-							   about process include_flag see comment in ip4_ip6() */
-			if (ip6_hdr->saddr.s6_addr32[2] != htonl(MAPPED_PREFIX)) {
-				PDEBUG("ip6_ip4(): Included IP packet Src addr isn't mapped addr: %x%x%x%x, packet dropped.\n",
-					   ip6_hdr->saddr.s6_addr32[0], ip6_hdr->saddr.s6_addr32[1],
-					   ip6_hdr->saddr.s6_addr32[2], ip6_hdr->saddr.s6_addr32[3]);
-				return -1;
-			}
-			if ( ip6_hdr->daddr.s6_addr32[2] != htonl(TRANSLATED_PREFIX)) {
-				PDEBUG("ip6_ip4(): Included IP packet Dst addr isn't translated addr: %x%x%x%x, packet dropped.\n",
-					   ip6_hdr->daddr.s6_addr32[0], ip6_hdr->daddr.s6_addr32[1],
-					   ip6_hdr->daddr.s6_addr32[2], ip6_hdr->daddr.s6_addr32[3]);
-				return -1;
-			}
-		}
-		else { /* It's normal IP packet (not included in ICMP) */
-			if (ip6_hdr->saddr.s6_addr32[2] != htonl(TRANSLATED_PREFIX)) {
-				PDEBUG("ip6_ip4(): Src addr isn't translated addr: %x%x%x%x, packet dropped.\n",
-					   ip6_hdr->saddr.s6_addr32[0], ip6_hdr->saddr.s6_addr32[1],
-					   ip6_hdr->saddr.s6_addr32[2], ip6_hdr->saddr.s6_addr32[3]);
-				return -1;
-			}
-			if ( ip6_hdr->daddr.s6_addr32[2] != htonl(MAPPED_PREFIX)) {
-				PDEBUG("ip6_ip4(): Dst addr isn't mapped addr: %x%x%x%x, packet dropped.\n",
-					   ip6_hdr->daddr.s6_addr32[0], ip6_hdr->daddr.s6_addr32[1],
-					   ip6_hdr->daddr.s6_addr32[2], ip6_hdr->daddr.s6_addr32[3]);
-				return -1;
-			}
-		}
-
-		/* Set IPv4 Fragment Offset and ID to 0
-		   before process any Option Headers */
-		ip_hdr->frag_off = 0;
-		ip_hdr->id = 0;
-
-		/*
-		 * We process only Fragment Header. Any other options headers
-		 * are ignored, i.e. there is no attempt to translate them.
-		 * However, the Total Length field and the Protocol field would
-		 * have to be adjusted to "skip" these extension headers.
-		 */
-
-		next_hdr = ip6_hdr->nexthdr;
-
-		/* Hop_by_Hop options header (ip6_hdr->nexthdr = 0). It must
-		 * appear only in IPv6 header's Next Header field.
-		 */
-		if (next_hdr == NEXTHDR_HOP) {
-			if ( (len_delta - sizeof(struct ipv6_opt_hdr)) >= 0)
-			{
-				struct ipv6_opt_hdr *ip6h =
-					(struct ipv6_opt_hdr *)(src+sizeof(struct ipv6hdr) + opts_len);
-				if ( (len_delta -= ip6h->hdrlen*8 + 8) >= 0)
-				{
-					opts_len += ip6h->hdrlen*8 + 8;  /* See  RFC 2460 page 11:
-							Hdr Ext Len  8-bit unsigned integer.  Length of the Hop-by-
-										 Hop Options header in 8-octet units, not
-										 including the first 8 octets.
-							*/
-					next_hdr = ip6h->nexthdr;
-				}
-				else
-				{
-					PDEBUG("ip6_ip4(): hop_by_hop header error, packet droped");
-					/* Generate ICMP Parameter Problem */
-					return -1;
-				}
-			}
-		}
-
-		if (len_delta > 0)
-		{
-			while(next_hdr != NEXTHDR_ICMP && next_hdr != NEXTHDR_TCP
-				  && next_hdr != NEXTHDR_UDP)
-			{
-				/* Destination options header */
-				if (next_hdr == NEXTHDR_DEST)
-				{
-					if ( (len_delta - sizeof(struct ipv6_opt_hdr)) >= 0)
-					{
-						struct ipv6_opt_hdr *ip6d =
-							(struct ipv6_opt_hdr *)(src + sizeof(struct ipv6hdr) + opts_len);
-						if ( (len_delta -= ip6d->hdrlen*8 + 8) >= 0)
-						{
-							opts_len += ip6d->hdrlen*8 + 8;
-							next_hdr = ip6d->nexthdr;
-						}
-					}
-					else
-					{
-						PDEBUG("ip6_ip4(): destination header error, packet droped");
-						/* Generate ICMP Parameter Problem */
-						return -1;
-					}
-				}
-				/* Routing options header */
-				else if (next_hdr == NEXTHDR_ROUTING)
-				{
-					if ( (len_delta - sizeof(struct ipv6_rt_hdr)) >= 0)
-					{
-						struct ipv6_rt_hdr *ip6rt =
-							(struct ipv6_rt_hdr *)(src+sizeof(struct ipv6hdr) + opts_len);
-						/* RFC 2765 SIIT, 4.1:
-						   If a routing header with a non-zero Segments Left field is present
-						   then the packet MUST NOT be translated, and an ICMPv6 "parameter
-						   problem/ erroneous header field encountered" (Type 4/Code 0) error
-						   message, with the Pointer field indicating the first byte of the
-						   Segments Left field, SHOULD be returned to the sender.
-						   */
-						if (ip6rt->segments_left != 0) {
-							/* Build ICMPv6 "Parameter Problem/Erroneous Header
-							   Field Encountered" & drop the packet */
-							/* !!! We don't send ICMPv6 "Parameter Problem" !!! */
-							PDEBUG("ip6_ip4(): routing header type != 0\n");
-							return -1;
-						}
-						if ( (len_delta -= ip6rt->hdrlen*8 + 8) >= 0)
-						{
-							opts_len += ip6rt->hdrlen*8 + 8;
-							next_hdr = ip6rt->nexthdr;
-						}
-						else
-						{
-							PDEBUG("ip6_ip4(): routing header error, packet droped");
-							/* Generate ICMP Parameter Problem */
-							return -1;
-						}
-					}
-				}
-				/* Fragment options header */
-				else if (next_hdr == NEXTHDR_FRAGMENT)
-				{
-					if ( (len_delta -= sizeof(struct frag_hdr)) >= 0)
-					{
-						struct frag_hdr *ip6f =
-							(struct frag_hdr *)(src+sizeof(struct ipv6hdr)+opts_len);
-
-						opts_len += sizeof(struct frag_hdr);      /* Frag Header Length = 8 */
-						ip_hdr->id = htons(ntohl(ip6f->identification)); /* ID field */
-						ip_hdr->frag_off = htons((ntohs(ip6f->frag_off) & IP6F_OFF_MASK) >> 3);
-										                                   /* fragment offset */
-						ip_hdr->frag_off = htons(ntohs(ip_hdr->frag_off) |
-										         ((ntohs(ip6f->frag_off) & IP6F_MORE_FRAG) << 13));
-										                                  /* more fragments flag */
-						next_hdr = ip6f->nexthdr;
-					}
-					else
-					{
-						PDEBUG("ip6_ip4(): fragment header error, packet droped");
-						/* Generate ICMP Parameter Problem */
-						return -1;
-					}
-				}
-				/* No Next Header */
-				else if (next_hdr == NEXTHDR_NONE)
-				{
-					/* RFC 2460 IPv6 Specification, 4.7
-					   4.7 No Next Header
-
-					   The value 59 in the Next Header field of an IPv6 header or any
-					   extension header indicates that there is nothing following that
-					   header.  If the Payload Length field of the IPv6 header indicates the
-					   presence of octets past the end of a header whose Next Header field
-					   contains 59, those octets must be ignored, and passed on unchanged if
-					   the packet is forwarded.
-					   */
-					break;
-				}
-				else if (next_hdr == NEXTHDR_ESP || next_hdr == NEXTHDR_AUTH)
-				{
-					PDEBUG("ip6_ip4(): cannot translate AUTH or ESP extention header, packet dropped\n");
-					return -1;
-				}
-				else if (next_hdr == NEXTHDR_IPV6)
-				{
-					PDEBUG("ip6_ip4(): cannot translate IPv6-IPv6 packet, packet dropped\n");
-					return -1;
-				}
-				else if (next_hdr == 0)
-				{
-					/* As say RFC 2460 (IPv6 Spec) we should discard the packet and send an
-					   ICMP Parameter Problem message to the source of the packet, with an
-					   ICMP Code value of 1 ("unrecognized Next Header type encountered")
-					   and the ICMP Pointer field containing the offset of the unrecognized
-					   value within the original packet
-					   */
-					/* NOT IMPLEMENTED */
-					PDEBUG("ip6_ip4(): NEXTHDR in extention header = 0, packet dropped\n");
-					return -1;
-				}
-				else
-				{
-					PDEBUG("ip6_ip4(): cannot translate extention header = %d, packet dropped\n", next_hdr);
-					return -1;
-				}
-			}
-		}
-	}
-	else
-	{
-	   PDEBUG("ip6_ip4(): error packet len, packet dropped.\n");
-	   return -1;
-	}
-
-	/* Building ipv4 packet */
-
-	ip_hdr->version = IPVERSION;
-	ip_hdr->ihl = 5;
-
-	/* TOS see comment about TOS in ip4_ip6() */
-	if (tos_ignore_flag)
-		ip_hdr->tos = 0;
-	else {
-		ip_hdr->tos = ip6_hdr->priority << 4;
-		ip_hdr->tos = ip_hdr->tos | (ip6_hdr->flow_lbl[0] >> 4);
-	}
-
-	/* IPv4 Total Len = IPv6 Payload Len +
-	   IPv4 Header Len (without options) - Options Headers Len */
-	ip6_payload_len = ntohs(ip6_hdr->payload_len);
-
-	if (ip6_payload_len == 0)
-		ntot_len = 0;
-	else
-		ntot_len = ip6_payload_len + IP4_IP6_HDR_DIFF - opts_len;
-
-	ip_hdr->tot_len = htons(ntot_len);
-
-	/* IPv4 TTL = IPv6 Hop Limit */
-	ip_hdr->ttl = ip6_hdr->hop_limit;
-
-	/* IPv4 Protocol = Next Header that will point to upper layer protocol */
-	ip_hdr->protocol = next_hdr;
-
-	/* IPv4 Src addr = last 4 bytes from IPv6 Src addr */
-	ip_hdr->saddr = ip6_hdr->saddr.s6_addr32[3];
-	/* IPv4 Dst addr = last 4 bytes from IPv6 Dst addr */
-	ip_hdr->daddr = ip6_hdr->daddr.s6_addr32[3];
-
-	/* Calculate IPv4 header checksum */
-	ip_hdr->check = 0;
-	ip_hdr->check = ip_fast_csum((unsigned char *)ip_hdr, ip_hdr->ihl);
-
-	if (len_delta > 0)
-	{
-		/* PROCESS ICMP */
-
-		if (next_hdr == NEXTHDR_ICMP)
-		{
-			struct icmp6hdr *icmp6_hdr;
-			struct icmphdr *icmp_hdr;
-
-			if ((len_delta -= sizeof(struct icmp6hdr)) >= 0)
-			{
-				icmp6_hdr = (struct icmp6hdr *)(src + sizeof(struct ipv6hdr) + opts_len);
-				icmp_hdr = (struct icmphdr *)(dst + sizeof(struct iphdr));
-
-				real_len += len_delta + sizeof(struct icmphdr);
-
-				/* There is diffirent between ICMPv4/ICMPv6 protocol codes
-				   IPPROTO_ICMP = 1
-				   IPPROTO_ICMPV6 = 58        */
-				ip_hdr->protocol = IPPROTO_ICMP;
-
-				if (include_flag) {
-					/* !!! Warnig !!! We discard ICMP packets with any ICMP as included
-					   in ICMP Error. But ICMP Error messages can include ICMP Query message
-					   */
-					if (icmp6_hdr->icmp6_type != ICMPV6_ECHO_REQUEST)
-					{
-						PDEBUG("ip6_ip4(): included ICMPv6 in ICMPv6 Error message, packet dropped\n");
-						return -1;
-					}
-				}
-
-			/* Translate ICMPv6 to ICMPv4 */
-				switch (icmp6_hdr->icmp6_type)
-				{
-/* ICMP Error messages */
-			/* Destination Unreachable (Type 1) */
-				case ICMPV6_DEST_UNREACH: /* Type 1 */
-					icmp_hdr->type = ICMP_DEST_UNREACH; /* to Type 3 */
-					icmp_hdr->un.echo.id = 0;
-					icmp_hdr->un.echo.sequence = 0;
-					switch (icmp6_hdr->icmp6_code)
-					{
-					case ICMPV6_NOROUTE: /* Code 0 */
-					case ICMPV6_NOT_NEIGHBOUR: /* Code 2 */
-					case ICMPV6_ADDR_UNREACH: /* Code 3  */
-						icmp_hdr->code = ICMP_HOST_UNREACH; /* To Code 1 */
-						break;
-					case ICMPV6_ADM_PROHIBITED: /* Code 1 */
-						icmp_hdr->code = ICMP_HOST_ANO; /* To Code 10 */
-						break;
-					case ICMPV6_PORT_UNREACH: /* Code 4 */
-						icmp_hdr->code = ICMP_PORT_UNREACH; /* To Code 3 */
-
-						break;
-					default:            /* discard any other codes */
-						PDEBUG("ip6_ip4(): Unknown ICMPv6 Type %d Code %d - packet dropped.\n",
-							   ICMPV6_DEST_UNREACH, icmp6_hdr->icmp6_code);
-						return -1;
-					}
-					break;
-			/* Packet Too Big (Type 2) */
-				case ICMPV6_PKT_TOOBIG: /* Type 2 */
-					icmp_hdr->type = ICMP_DEST_UNREACH; /* to Type 3  */
-					icmp_hdr->code = ICMP_FRAG_NEEDED; /*  to Code 4 */
-					/* Change MTU, RFC 2765 (SIIT), 4.2:
-					   The MTU field needs to be adjusted for the difference between
-					   the IPv4 and IPv6 header sizes taking into account whether or
-					   not the packet in error includes a Fragment header.
-					   */
-					/* !!! Don't implement !!! */
-					icmp_hdr->un.frag.mtu = (__u16) icmp6_hdr->icmp6_mtu;
-					break;
-			/* Time Exceeded (Type 3) */
-				case ICMPV6_TIME_EXCEED:
-					icmp_hdr->type = ICMP_TIME_EXCEEDED; /* to Type 11 */
-					icmp_hdr->code = icmp6_hdr->icmp6_code; /* Code unchanged */
-					break;
-			/* Parameter Problem (Type 4) */
-				case ICMPV6_PARAMPROB:
-					switch (icmp6_hdr->icmp6_code) {
-					case ICMPV6_UNK_NEXTHDR: /* Code 1 */
-						icmp_hdr->type = ICMP_DEST_UNREACH; /* to Type 3 */
-						icmp_hdr->code = ICMP_PROT_UNREACH; /* to Code 2 */
-						break;
-					default: /* if Code != 1 */
-						icmp_hdr->type = ICMP_PARAMETERPROB; /* to Type 12 */
-						icmp_hdr->code = 0; /* to Code 0 */
-						/* Update Pointer field
-						   RFC 2765 (SIIT), 4.2:
-						   The Pointer needs to be updated to point to the corresponding
-						   field in the translated include IP header.
-						   */
-						switch (ntohl(icmp6_hdr->icmp6_pointer))
-						{
-						case 0: /* IPv6 Version -> IPv4 Version */
-							icmp_hdr->un.echo.id = 0;
-							break;
-						case 4: /* IPv6 PayloadLength -> IPv4 Total Length */
-							icmp_hdr->un.echo.id = 0x0002; /* 2 */
-							break;
-						case 6: /* IPv6 Next Header-> IPv4 Protocol */
-							icmp_hdr->un.echo.id = 0x0009; /* 9 */
-							break;
-						case 7: /* IPv6 Hop Limit -> IPv4 TTL */
-							icmp_hdr->un.echo.id = 0x0008; /* 8 */
-							break;
-						case 8: /* IPv6 Src addr -> IPv4 Src addr */
-							icmp_hdr->un.echo.id = 0x000c; /* 12 */
-							break;
-						case 24: /* IPv6 Dst addr -> IPv4 Dst addr*/
-							icmp_hdr->un.echo.id = 0x0010; /* 16 */
-							break;
-						default: /* set all ones in other cases */
-							icmp_hdr->un.echo.id = 0xff;
-							break;
-						}
-						break;
-					}
-					break;
-
-/* End of ICMP Error messages */
-
-			/* Echo Request and Echo Reply (Type 128 and 129)  */
-				case ICMPV6_ECHO_REQUEST:
-					icmperr = 0;        /* not error ICMP message */
-					icmp_hdr->type = ICMP_ECHO; /* to Type 8 */
-					icmp_hdr->code = 0; /* to Code 0 */
-					icmp_hdr->un.echo.id = icmp6_hdr->icmp6_identifier;
-					icmp_hdr->un.echo.sequence = icmp6_hdr->icmp6_sequence;
-					/* copy rest of ICMP data to result packet */
-					if (len_delta > 0)
-						memcpy(((char *)icmp_hdr) + sizeof(struct icmphdr),
-							   ((char *)icmp6_hdr) + sizeof(struct icmp6hdr), len_delta);
-					break;
-				case ICMPV6_ECHO_REPLY:
-					icmperr = 0;        /* not error ICMP message */
-					icmp_hdr->type = ICMP_ECHOREPLY; /* to Type 0 */
-					icmp_hdr->code = 0; /* to Code 0 */
-					icmp_hdr->un.echo.id = icmp6_hdr->icmp6_identifier;
-					icmp_hdr->un.echo.sequence = icmp6_hdr->icmp6_sequence;
-					/* copy rest of ICMP data */
-					if (len_delta > 0)
-						memcpy(((char *)icmp_hdr) + sizeof(struct icmphdr),
-							   ((char *)icmp6_hdr) + sizeof(struct icmp6hdr), len_delta);
-					break;
-				default:
-					/* Unknown error messages. Silently drop. */
-					PDEBUG("ip6_ip4(): unknown ICMPv6 Type %d, packet dropped.\n", icmp6_hdr->icmp6_type);
-					return -1;
-				}
-
-				if (icmperr)
-				{
-					/* If ICMP Error message, we translate IP included packet*/
-					if (len_delta >= sizeof(struct ipv6hdr))
-					{
-						if((inc_opts_len = ip6_ip4((char *)icmp6_hdr + sizeof(struct icmp6hdr), len_delta,
-										           (char *)icmp_hdr + sizeof(struct icmphdr), 1)) == -1) {
-							PDEBUG("ip6_ip4(): incorrect translation of ICMPv6 Error message, packet dropped\n");
-							return -1;
-						}
-						/* correct IPv4 Total Len that = old Total Len
-						   - Options Headers Len in included IP packet
-						   - diffirence between IPv6 Header Len and IPv4 Header Len
-						   */
-						if (ntot_len != 0)
-							ip_hdr->tot_len = htons(ntot_len - inc_opts_len - IP4_IP6_HDR_DIFF);
-						real_len = real_len - inc_opts_len - IP4_IP6_HDR_DIFF;
-					}
-					else if (len_delta > 0)
-					{
-						/* May be it need set 0x0 to rest area in result IPv4 packet,
-						 * but we copy rest data unchanged
-						 */
-						memcpy(((char *)icmp_hdr) + sizeof(struct icmphdr),
-							   ((char *)icmp6_hdr) + sizeof(struct icmp6hdr), len_delta);
-					}
-				}
-
-				/* Calculate IPv4 Header checksum */
-				ip_hdr->check = 0;
-				ip_hdr->check = ip_fast_csum((unsigned char *)ip_hdr, ip_hdr->ihl);
-
-				/* Calculate ICMPv4 checksum */
-				if (ntot_len != 0)
-				{
-					icmp_hdr->checksum = 0;
-					icmp_hdr->checksum = ip_compute_csum((unsigned char *)icmp_hdr, ntohs(ip_hdr->tot_len)
-										             - sizeof(struct iphdr));
-				}
-			}
-			else
-			{
-				PDEBUG("ip6_ip4(): error length ICMP packet, packet dropped.\n");
-				return -1;
-			}
-
-		}
-		/* PROCESS TCP and UDP (and rest data) */
-
-		else {
-			real_len += len_delta;
-			/* we copy rest data to IPv4 packet without changing */
-			memcpy(dst+sizeof(struct iphdr), src + sizeof(struct ipv6hdr) + opts_len, len_delta);
-		}
-	}
-
-	if (include_flag)           /* if it's included IP packet */
-		return opts_len;        /* return options headers length */
-	else
-		return real_len; /* result packet len */
-}
-
-/*
- * ip4_fragment(skb, len, hdr_len, dev, eth_h)
- * to fragment original IPv4 packet if result IPv6 packet will be > 1280
- */
-
-static int ip4_fragment(struct sk_buff *skb, int len, int hdr_len, struct net_device *dev, struct ethhdr *eth_h)
-{
-	struct sk_buff *skb2 = NULL;       /* pointer to new struct sk_buff for transleded packet */
-	char buff[FRAG_BUFF_SIZE+hdr_len]; /* buffer to form new fragment packet */
-	char *cur_ptr = skb->data+hdr_len; /* pointter to current packet data with len = frag_len */
-	struct iphdr *ih4 = (struct iphdr *) skb->data;
-	struct iphdr *new_ih4 = (struct iphdr *) buff; /* point to new IPv4 hdr */
-	struct ethhdr *new_eth_h;   /* point to ether hdr, need to set hard header data in fragment */
-	int data_len = len - hdr_len; /* origin packet data len */
-	int rest_len = data_len;    /* rest data to fragment */
-	int frag_len = 0;           /* current fragment len */
-	int last_frag = 0;          /* last fragment flag, if = 1, it's last fragment */
-	int flag_last_mf = 0;
-	__u16 new_id = 0;           /* to generate identification field */
-	__u16 frag_offset = 0;      /* fragment offset */
-	unsigned int csum;
-	unsigned short udp_len;
-
-#ifdef SIIT_DEBUG
-	printk("siit: it's DF == 0 and result IPv6 packet will be > 1280\n");
-	siit_print_dump(skb->data, hdr_len, "siit: (orig) ipv4_hdr dump");
-#endif
-
-	if ((ntohs(ih4->frag_off) & IP_MF) == 0 )
-		/* it's a case we'll clear MF flag in our last packet */
-		flag_last_mf = 1;
-
-	if (ih4->protocol == IPPROTO_UDP) {
-		if ( (ntohs(ih4->frag_off) & IP_OFFSET) == 0) {
-			struct udphdr *udp_hdr = (struct udphdr *)((char *)ih4 + hdr_len);
-			if (!flag_last_mf) {
-				if (udp_hdr->check == 0) {
-					/* it's a first fragment with ZERO checksum and we drop packet */
-					printk("siit: First fragment of UDP with zero checksum - packet droped\n");
-					printk("siit: addr: %x src port: %d dst port: %d\n",
-						   htonl(ih4->saddr), htons(udp_hdr->source), htons(udp_hdr->dest));
-					return -1;
-				}
-			}
-			else if (udp_hdr->check == 0) {
-				/* Calculate UDP checksum only if it's not fragment */
-				udp_len = ntohs(udp_hdr->len);
-				csum = 0;
-				csum = csum_partial((unsigned char *)udp_hdr, udp_len, csum);
-				udp_hdr->check = csum_tcpudp_magic(ih4->saddr, ih4->daddr, udp_len, IPPROTO_UDP, csum);
-			}
-		}
-	}
-
-	frag_offset = ntohs(ih4->frag_off) & IP_OFFSET;
-
-	new_id = ih4->id;
-
-	while(1) {
-		if (rest_len <= FRAG_BUFF_SIZE) {
-			/* it's last fragmen */
-			frag_len = rest_len; /* rest data */
-			last_frag = 1;
-		}
-		else
-			frag_len = FRAG_BUFF_SIZE;
-
-		/* copy IP header to buffer */
-		memcpy(buff, skb->data, hdr_len);
-		/* copy data to buffer with len = frag_len */
-		memcpy(buff + hdr_len, cur_ptr, frag_len);
-
-		/* set id field in new IPv4 header*/
-		new_ih4->id = new_id;
-
-		/* is it last fragmet */
-		if(last_frag && flag_last_mf)
-			/* clear MF flag */
-			new_ih4->frag_off = htons(frag_offset & (~IP_MF));
-		else
-			/* set MF flag */
-			new_ih4->frag_off = htons(frag_offset | IP_MF);
-
-		/* change packet total length */
-		new_ih4->tot_len = htons(frag_len+hdr_len);
-
-		/* rebuild the header checksum (IP needs it) */
-		new_ih4->check = 0;
-		new_ih4->check = ip_fast_csum((unsigned char *)new_ih4,new_ih4->ihl);
-
-		/* Allocate new sk_buff to compose translated packet */
-		skb2 = dev_alloc_skb(frag_len+hdr_len+dev->hard_header_len+IP4_IP6_HDR_DIFF+IP6_FRAGMENT_SIZE);
-		if (!skb2) {
-			printk(KERN_DEBUG "%s: alloc_skb failure - packet dropped.\n", dev->name);
-			dev_kfree_skb(skb2);
-			return -1;
-		}
-		/* allocate skb->data portion for IP header len, fragment data len and ether header len
-		 * and copy to head ether header from origin skb
-		 */
-		memcpy(skb_put(skb2, frag_len+hdr_len+dev->hard_header_len+IP4_IP6_HDR_DIFF+IP6_FRAGMENT_SIZE), (char *) eth_h,
-			   dev->hard_header_len);
-		/* correct ether header data, ether protocol field to ETH_P_IPV6 */
-		new_eth_h = (struct ethhdr *)skb2->data;
-		new_eth_h->h_proto = htons(ETH_P_IPV6);
-
-		/* reset the mac header */
-		skb_reset_mac_header(skb2);
-
-		/* pull ether header from new skb->data */
-		skb_pull(skb2, dev->hard_header_len);
-		/* set skb protocol to IPV6 */
-		skb2->protocol = htons(ETH_P_IPV6);
-
-		/* call translation function */
-		if ( ip4_ip6(buff, frag_len+hdr_len, skb2->data, 0) == -1) {
-			dev_kfree_skb(skb2);
-			return -1;
-		}
-
-		/*
-		 * Set needed fields in new sk_buff
-		 */
-		skb2->dev = dev;
-		skb2->ip_summed = CHECKSUM_UNNECESSARY;
-		skb2->pkt_type = PACKET_HOST;
-
-		/* Add transmit statistic */
-		siit_stats(dev)->tx_packets++;
-		siit_stats(dev)->tx_bytes += skb2->len;
-
-		/* send packet to upper layer */
-		netif_rx(skb2);
-
-		/* exit if it was last fragment */
-		if (last_frag)
-			break;
-
-		/* correct current data pointer */
-		cur_ptr += frag_len;
-		/* rest data len */
-		rest_len -= frag_len;
-		/* current fragment offset */
-		frag_offset = (frag_offset*8 + frag_len)/8;
-	}
-
-	return 0;
-}
-/*
- * Transmit a packet (called by the kernel)
- *
- * siit_xmit(skb, dev)
- *
- * where
- * skb - pointer to struct sk_buff with incomed packet
- * dev - pointer to struct device on which packet revieved
- *
- * Statistic:
- * for all incoming packes:
- *            stats.rx_bytes+=skb->len
- *            stats.rx_packets++
- * for packets we can't transle:
- *            stats.tx_errors++
- * device busy:
- *            stats.tx_errors++
- * for packets we can't allocate sk_buff:
- *            stats.tx_dropped++
- * for outgoing packes:
- *            stats.tx_packets++
- *            stats.tx_bytes+=skb2->len !!! But we don't set skb2->len !!!
- */
-
-static int siit_xmit(struct sk_buff *skb, struct net_device *dev)
-{
-	struct sk_buff *skb2 = NULL;/* pointer to new struct sk_buff for transleded packet */
-	struct ethhdr *eth_h;       /* pointer to incoming Ether header */
-	int len;                    /* original packets length */
-	int new_packet_len;
-	int skb_delta = 0;          /* delta size for allocate new skb */
-	char new_packet_buff[2048];
-
-	/* Check pointer to sk_buff and device structs */
-	if (skb == NULL || dev == NULL)
-		return -EINVAL;
-
-	/* Add receive statistic */
-	siit_stats(dev)->rx_bytes += skb->len;
-	siit_stats(dev)->rx_packets++;
-
-	dev->trans_start = jiffies;
-
-	/* Upper layer (IP) protocol forms sk_buff for outgoing packet
-	 * and sets IP header + Ether header too. IP layer sets outgoing
-	 * device in sk_buff->dev.
-	 * In function (from linux/net/core/dev.c) ther is a call to
-	 * device transmit function (dev->hard_start_xmit):
-	 *
-	 *    dev_queue_xmit(struct sk_buff *skb)
-	 *    {
-	 *    ...
-	 *          device *dev = skb->dev;
-	 *    ...
-	 *          dev->hard_start_xmit(skb, dev);
-	 *    ...
-	 *    }
-	 * We save pointer to ether header in eth_h and skb_pull ether header
-	 * from data field of skb_buff
-	 */
-
-	eth_h = (struct ethhdr *)skb->data; /* point to incoming packet Ether Header */
-
-#ifdef SIIT_DEBUG
-	siit_print_dump(skb->data, ETH_HLEN, "siit: eth_hdr dump");
-#endif
-
-	/* Remove hardware header from origin sk_buff */
-	skb_pull(skb,dev->hard_header_len);
-
-	/*
-	 * Process IPv4 paket
-	 */
-	if (ntohs(skb->protocol) == ETH_P_IP) {
-		int hdr_len;            /* IPv4 header length */
-		int data_len;           /* IPv4 data length */
-		struct iphdr *ih4;      /* pointer to IPv4 header */
-		struct icmphdr *icmp_hdr;   /* point to current ICMPv4 header struct */
-
-		ih4 = (struct iphdr *)skb->data; /* point to incoming packet's IPv4 header */
-
-		/* Check IPv4 Total Length */
-		if (skb->len != ntohs(ih4->tot_len)) {
-			PDEBUG("siit_xmit(): Different skb_len %x and ip4 tot_len %x - packet dropped.\n",
-				   skb->len, ih4->tot_len);
-			siit_stats(dev)->tx_errors++;
-			dev_kfree_skb(skb);
-			return 0;
-		}
-
-		len = skb->len;     /* packet's total len */
-		hdr_len = (int)(ih4->ihl * 4); /* packet's header len */
-		data_len = len - hdr_len; /* packet's data len */
-
-		/* If DF == 0 */
-		if ( (ntohs(ih4->frag_off) & IP_DF) == 0 ) {
-			/* If result IPv6 packet will be > 1280
-			   we need to fragment original IPv4 packet
-			*/
-			if ( data_len > FRAG_BUFF_SIZE ) {
-				/* call function that fragment packet and translate to IPv6 each fragment
-				 * and send to upper layer
-				 */
-				if ( ip4_fragment(skb, len, hdr_len, dev, eth_h) == -1) {
-					siit_stats(dev)->tx_errors++;
-				}
-				/* Free incoming skb */
-				dev_kfree_skb(skb);
-				/* Device can accept a new packet */
-
-				return 0;
-
-			}
-		}
-		/* If DF == 1 && MF == 0 && Fragment Offset == 0
-		 * we don't include fragment header
-		 */
-		if ( ntohs(ih4->frag_off) == IP_DF )
-			skb_delta = IP4_IP6_HDR_DIFF; /* delta is +20 */
-		else
-			skb_delta = IP4_IP6_HDR_DIFF + IP6_FRAGMENT_SIZE; /* delta is +20 and +8 */
-
-		/* If it's ICMP, check is it included IP packet in it */
-		if ( ih4->protocol == IPPROTO_ICMP) {
-			icmp_hdr = (struct icmphdr *) (skb->data+hdr_len); /* point to ICMPv4 header */
-			if ( icmp_hdr->type != ICMP_ECHO && icmp_hdr->type != ICMP_ECHOREPLY) {
-				/*
-				 * It's ICMP Error that has included IP packet
-				 * we'll add only +20 because we don't include Fragment Header
-				 * into translated included IP packet
-				 */
-				skb_delta += IP4_IP6_HDR_DIFF;
-			}
-		}
-
-		/* Allocate new sk_buff to compose translated packet */
-		skb2 = dev_alloc_skb(len+dev->hard_header_len+skb_delta);
-		if (!skb2) {
-			printk(KERN_DEBUG "%s: alloc_skb failure - packet dropped.\n", dev->name);
-			dev_kfree_skb(skb);
-			siit_stats(dev)->rx_dropped++;
-
-			return 0;
-		}
-		/* allocate skb->data portion = IPv4 packet len + ether header len
-		 * + skb_delta (max = two times (diffirence between IPv4 header and
-		 * IPv6 header + Frag Header), second for included packet,
-		 * and copy to head of skb->data ether header from origin skb
-		 */
-		memcpy(skb_put(skb2, len+dev->hard_header_len+skb_delta), (char *)eth_h, dev->hard_header_len);
-		/* correct ether header data, ether protocol field to ETH_P_IPV6 */
-		eth_h = (struct ethhdr *)skb2->data;
-		eth_h->h_proto = htons(ETH_P_IPV6);
-		skb_reset_mac_header(skb2);
-		/* remove ether header from new skb->data,
-		 * NOTE! data will rest, pointer to data and data len will change
-		 */
-		skb_pull(skb2,dev->hard_header_len);
-		/* set skb protocol to IPV6 */
-		skb2->protocol = htons(ETH_P_IPV6);
-
-		/* call translation function */
-		if (ip4_ip6(skb->data, len, skb2->data, 0) == -1 ) {
-			dev_kfree_skb(skb);
-			dev_kfree_skb(skb2);
-			siit_stats(dev)->rx_errors++;
-
-			return 0;
-		}
-	}
-	/*
-	 * IPv6 paket
-	 */
-	else if (ntohs(skb->protocol) == ETH_P_IPV6) {
-
-#ifdef SIIT_DEBUG
-		siit_print_dump(skb->data, sizeof(struct ipv6hdr), "siit: (in) ip6_hdr dump");
-#endif
-		/* packet len = skb->data len*/
-		len = skb->len;
-
-		/* call translation function */
-		if ((new_packet_len = ip6_ip4(skb->data, len, new_packet_buff, 0)) == -1 )
-		{
-			PDEBUG("siit_xmit(): error translation ipv6->ipv4, packet dropped.\n");
-			siit_stats(dev)->rx_dropped++;
-			goto end;
-		}
-
-		/* Allocate new sk_buff to compose translated packet */
-		skb2 = dev_alloc_skb(new_packet_len + dev->hard_header_len);
-		if (!skb2) {
-			printk(KERN_DEBUG "%s: alloc_skb failure, packet dropped.\n", dev->name);
-			siit_stats(dev)->rx_dropped++;
-			goto end;
-		}
-		memcpy(skb_put(skb2, new_packet_len + dev->hard_header_len), (char *)eth_h, dev->hard_header_len);
-		eth_h = (struct ethhdr *)skb2->data;
-		eth_h->h_proto = htons(ETH_P_IP);
-		skb_reset_mac_header(skb2);
-		skb_pull(skb2, dev->hard_header_len);
-		memcpy(skb2->data, new_packet_buff, new_packet_len);
-		skb2->protocol = htons(ETH_P_IP);
-	}
-	else {
-		PDEBUG("siit_xmit(): unsupported protocol family %x, packet dropped.\n", skb->protocol);
-		goto end;
-	}
-
-	/*
-	 * Set needed fields in new sk_buff
-	 */
-	skb2->pkt_type = PACKET_HOST;
-	skb2->dev = dev;
-	skb2->ip_summed = CHECKSUM_UNNECESSARY;
-
-	/* Add transmit statistic */
-	siit_stats(dev)->tx_packets++;
-	siit_stats(dev)->tx_bytes += skb2->len;
-
-	/* Send packet to upper layer protocol */
-	netif_rx(skb2);
-
-end:
-	dev_kfree_skb(skb);
-
-	return 0;
-}
-
-#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0)
-static bool header_ops_init = false;
-static struct header_ops siit_header_ops ____cacheline_aligned;
-#endif
-
-#if !(defined CONFIG_COMPAT_NET_DEV_OPS) && LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,30)
-static const struct net_device_ops siit_netdev_ops = {
-	.ndo_open		= siit_open,
-	.ndo_stop		= siit_release,
-	.ndo_start_xmit		= siit_xmit,
-};
-#endif
-
-/*
- * The init function initialize of the SIIT device..
- * It is invoked by register_netdev()
- */
-
-static void
-siit_init(struct net_device *dev)
-{
-	ether_setup(dev);    /* assign some of the fields */
-	random_ether_addr(dev->dev_addr);
-
-	/*
-	 * Assign device function.
-	 */
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,30)
-	dev->open            = siit_open;
-	dev->stop            = siit_release;
-	dev->hard_start_xmit = siit_xmit;
-#else
-#if !(defined CONFIG_COMPAT_NET_DEV_OPS) && LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,30)
-	dev->netdev_ops = &siit_netdev_ops;
-#endif
-#endif
-	dev->flags           |= IFF_NOARP;     /* ARP not used */
-	dev->tx_queue_len = 10;
-
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
-	dev->hard_header_cache = NULL;        /* Disable caching */
-	memset(netdev_priv(dev), 0, sizeof(struct net_device_stats));
-	dev->get_stats = siit_get_stats;
-#else
-	if (!header_ops_init) {
-		memcpy(&siit_header_ops, dev->header_ops, sizeof(struct header_ops));
-		siit_header_ops.cache = NULL;
-	}
-	dev->header_ops = &siit_header_ops;
-#endif
-}
-
-/*
- * Finally, the module stuff
- */
-static struct net_device *siit_dev = NULL;
-
-int init_module(void)
-{
-	int res = -ENOMEM;
-	int priv_size;
-
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
-	priv_size = sizeof(struct net_device_stats);
-#else
-	priv_size = sizeof(struct header_ops);
-#endif
-	siit_dev = alloc_netdev(priv_size, "siit%d", siit_init);
-	if (!siit_dev)
-		goto err_alloc;
-
-	res = register_netdev(siit_dev);
-	if (res)
-		goto err_register;
-
-	return 0;
-
-err_register:
-	free_netdev(siit_dev);
-err_alloc:
-	printk(KERN_ERR "Error creating siit device: %d\n", res);
-	return res;
-}
-
-void cleanup_module(void)
-{
-	unregister_netdev(siit_dev);
-	free_netdev(siit_dev);
-}
-
-