siit: moved to github
authorHauke Mehrtens <hauke@hauke-m.de>
Mon, 13 Jul 2015 19:45:58 +0000 (19:45 +0000)
committerHauke Mehrtens <hauke@hauke-m.de>
Mon, 13 Jul 2015 19:45:58 +0000 (19:45 +0000)
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
SVN-Revision: 46327

net/siit/Makefile [deleted file]
net/siit/src/Makefile [deleted file]
net/siit/src/siit.c [deleted file]
net/siit/src/siit.h [deleted file]

diff --git a/net/siit/Makefile b/net/siit/Makefile
deleted file mode 100644 (file)
index fc059e7..0000000
+++ /dev/null
@@ -1,40 +0,0 @@
-#
-# Copyright (C) 2006-2010 OpenWrt.org
-#
-# This is free software, licensed under the GNU General Public License v2.
-# See /LICENSE for more information.
-#
-
-include $(TOPDIR)/rules.mk
-include $(INCLUDE_DIR)/kernel.mk
-
-PKG_NAME:=siit
-PKG_VERSION:=1.1
-PKG_RELEASE:=2
-
-include $(INCLUDE_DIR)/package.mk
-
-define KernelPackage/siit
-  SUBMENU:=Network Devices
-  TITLE:=Stateless IP ICMP Translation Algorithm
-  DEPENDS:= @(!(TARGET_ps3||TARGET_pxcab)||BROKEN)
-  FILES:=$(PKG_BUILD_DIR)/siit.ko
-  AUTOLOAD:=$(call AutoLoad,50,siit)
-endef
-
-include $(INCLUDE_DIR)/kernel-defaults.mk
-
-define KernelPackage/siit/description
- Stateless IP ICMP Translation Algorithm
-endef
-
-define Build/Prepare
-       mkdir -p $(PKG_BUILD_DIR)
-       cp src/Makefile src/siit.h src/siit.c $(PKG_BUILD_DIR)/
-endef
-
-define Build/Compile
-       $(MAKE) $(KERNEL_MAKEOPTS) SUBDIRS="$(PKG_BUILD_DIR)" modules
-endef
-
-$(eval $(call KernelPackage,siit))
diff --git a/net/siit/src/Makefile b/net/siit/src/Makefile
deleted file mode 100644 (file)
index 06c36f1..0000000
+++ /dev/null
@@ -1,5 +0,0 @@
-obj-m   := siit.o
-ifeq ($(MAKING_MODULES),1)
--include $(TOPDIR)/Rules.make
-endif
-
diff --git a/net/siit/src/siit.c b/net/siit/src/siit.c
deleted file mode 100644 (file)
index 20cfabf..0000000
+++ /dev/null
@@ -1,1425 +0,0 @@
-/*
- * siit.c: the Stateless IP/ICMP Translator (SIIT) module for Linux.
- *
- *
- */
-
-#include <linux/version.h>
-#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>
-#include <net/ip6_checksum.h>
-#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;
-
-#define siit_stats(_dev) (&(_dev)->stats)
-
-/*
- * 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;
-}
-
-static bool header_ops_init = false;
-static struct header_ops siit_header_ops ____cacheline_aligned;
-
-static const struct net_device_ops siit_netdev_ops = {
-       .ndo_open               = siit_open,
-       .ndo_stop               = siit_release,
-       .ndo_start_xmit         = siit_xmit,
-};
-
-/*
- * 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.
-        */
-       dev->netdev_ops = &siit_netdev_ops;
-       dev->flags           |= IFF_NOARP;     /* ARP not used */
-       dev->tx_queue_len = 10;
-
-       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;
-}
-
-/*
- * Finally, the module stuff
- */
-static struct net_device *siit_dev = NULL;
-
-int init_module(void)
-{
-       int res = -ENOMEM;
-       int priv_size;
-
-       priv_size = sizeof(struct header_ops);
-       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);
-}
-
-MODULE_LICENSE("GPL");
diff --git a/net/siit/src/siit.h b/net/siit/src/siit.h
deleted file mode 100644 (file)
index 47cf776..0000000
+++ /dev/null
@@ -1,61 +0,0 @@
-/*
- * siit.h -- definitions for the SIIT module
- *
- *
- */
-
-/*
- * Constants
- */
-
-/* SIIT_ETH control the name of SIIT interface:
- * 0 - interface name is siit0,
- * 1 - interface name is ethX.
- */
-#define SIIT_ETH 0
-
-#define BUFF_SIZE 4096
-#define FRAG_BUFF_SIZE 1232     /* IPv6 max fragment size without IPv6 header 
-                                 * to fragmanet IPv4 if result IPv6 packet will be > 1280
-                                 */
-
-#define TRANSLATED_PREFIX 0x0000ffff /* third byte in IPv4-translated addr prefix */
-#define MAPPED_PREFIX 0x0000ffff     /* third byte in IPv4-mapped addr prefix */
-
-#define IP4_IP6_HDR_DIFF 20     /* diffirence between IPv4 and IPv6 headers */
-#define IP6_FRAGMENT_SIZE 8     /* size of Fragment Header */
-
-/* IPv6 header fields masks */
-#define IP6F_OFF_MASK       0xfff8  /* mask out offset from frag_off */
-#define IP6F_RESERVED_MASK  0x0006  /* reserved bits in frag_off */
-#define IP6F_MORE_FRAG      0x0001  /* more-fragments flag */
-
-
-
-/*
- * Macros to help debugging
- */
-
-#undef PDEBUG             /* undef it, just in case */
-#ifdef SIIT_DEBUG
-#  ifdef __KERNEL__
-     /* This one if debugging is on, and kernel space */
-#    define PDEBUG(fmt, args...) printk(KERN_DEBUG "siit: " fmt, ## args)
-#  else
-     /* This one for user space */
-#    define PDEBUG(fmt, args...) fprintf(stderr, fmt, ## args)
-#  endif
-#else
-#  define PDEBUG(fmt, args...) /* not debugging: nothing */
-#endif
-
-#undef PDEBUGG
-#define PDEBUGG(fmt, args...)
-
-
-
-
-
-
-
-