slaac.c

00001 #include <string.h>
00002 
00003 #include "mac.h"
00004 #include "ip6addr.h"
00005 
00006 char SlaacLinkLocalIp[16];
00007 char SlaacUniqueLocalIp[16];
00008 char SlaacGlobalIp[16];
00009 
00010 int SlaacScope(char* ip)
00011 {
00012     if (Ip6AddrIsSame(ip, SlaacLinkLocalIp)) return SCOPE_LINK_LOCAL;
00013     if (Ip6AddrIsSame(ip, SlaacGlobalIp   )) return SCOPE_GLOBAL;
00014     return SCOPE_NONE;
00015 }
00016 void SlaacAddressFromScope(int scope, char* pSrcIp)
00017 {
00018     switch (scope)
00019     {
00020         case SCOPE_GLOBAL:       Ip6AddrCopy(pSrcIp, SlaacGlobalIp     ); break;
00021         case SCOPE_UNIQUE_LOCAL: Ip6AddrCopy(pSrcIp, SlaacUniqueLocalIp); break;
00022         default:                 Ip6AddrCopy(pSrcIp, SlaacLinkLocalIp  ); break;
00023     }
00024     //Note that scope could be SCOPE_NONE if source was multicast in which case should return the link local ip.
00025 }
00026 
00027 void SlaacMakeGlobal(char* pPrefix)
00028 {
00029     memcpy(SlaacGlobalIp, pPrefix, 8);
00030     char* p = SlaacGlobalIp + 8;
00031     *p++ = MacLocal[0] | 0x02; //Modified EUI-64
00032     *p++ = MacLocal[1];
00033     *p++ = MacLocal[2];
00034     *p++ = 0xFF;
00035     *p++ = 0xFE;
00036     *p++ = MacLocal[3];
00037     *p++ = MacLocal[4];
00038     *p++ = MacLocal[5];
00039     
00040 }
00041 void SlaacMakeUniqueLocal(char* pPrefix)
00042 {
00043     memcpy(SlaacUniqueLocalIp, pPrefix, 8);
00044     char* p = SlaacUniqueLocalIp + 8;
00045     *p++ = MacLocal[0] | 0x02; //Modified EUI-64
00046     *p++ = MacLocal[1];
00047     *p++ = MacLocal[2];
00048     *p++ = 0xFF;
00049     *p++ = 0xFE;
00050     *p++ = MacLocal[3];
00051     *p++ = MacLocal[4];
00052     *p++ = MacLocal[5];
00053     
00054 }
00055 void SlaacInit()
00056 {
00057     char* p = SlaacLinkLocalIp; //fe80::::202:f7ff:fef2:7d27
00058     *p++ = 0xFE;
00059     *p++ = 0x80;
00060     *p++ = 0x00;
00061     *p++ = 0x00;
00062     *p++ = 0x00;
00063     *p++ = 0x00;
00064     *p++ = 0x00;
00065     *p++ = 0x00;
00066     *p++ = MacLocal[0] | 0x02; //Modified EUI-64
00067     *p++ = MacLocal[1];
00068     *p++ = MacLocal[2];
00069     *p++ = 0xFF;
00070     *p++ = 0xFE;
00071     *p++ = MacLocal[3];
00072     *p++ = MacLocal[4];
00073     *p++ = MacLocal[5];
00074 }