int AnalyzeIpv6(u_char *data,int size)
{
u_char *ptr;
int lest;
struct ip6_hdr *ip6;
int len;
ptr=data;
lest=size;
if(lest<sizeof(struct ip6_hdr)){
fprintf(stderr,"lest(%d)<sizeof(struct ip6_hdr)\n",lest);
return(-1);
}
ip6=(struct ip6_hdr *)ptr;
ptr+=sizeof(struct ip6_hdr);
lest-=sizeof(struct ip6_hdr);
if(fil[5] == 1){
PrintIp6Header(ip6,stdout);
}
if(ip6->ip6_nxt==IPPROTO_ICMPV6){
len=ntohs(ip6->ip6_plen);
if(checkIP6DATAchecksum(ip6,ptr,len)==0){
fprintf(stderr,"bad icmp6 checksum\n");
return(-1);
}
AnalyzeIcmp6(ptr,lest);
}
else if(ip6->ip6_nxt==IPPROTO_TCP){
len=ntohs(ip6->ip6_plen);
if(checkIP6DATAchecksum(ip6,ptr,len)==0){
fprintf(stderr,"bad tcp6 checksum\n");
return(-1);
}
AnalyzeTcp(ptr,lest);
}
else if(ip6->ip6_nxt==IPPROTO_UDP){
len=ntohs(ip6->ip6_plen);
if(checkIP6DATAchecksum(ip6,ptr,len)==0){
fprintf(stderr,"bad udp6 checksum\n");
return(-1);
}
AnalyzeUdp(ptr,lest);
}
return(0);
}
int AnalyzeIpv6(u_char *data, int size) {
u_char *ptr = NULL;
int lest = 0;
struct ip6_hdr *ip6 = NULL;
int len = 0;
ptr = data;
lest = size;
if (lest < sizeof(struct ip6_hdr)) {
ExitWithTooLittleLengthError("ip6_hdr", lest);
}
ip6 = (struct ip6_hdr *) ptr;
ptr += sizeof(struct ip6_hdr);
lest += sizeof(struct ip6_hdr);
PrintIp6Header(ip6, stdout);
if (ip6->ip6_nxt == IPPROTO_ICMPV6) {
len = ntohs(ip6->ip6_plen);
if (checkIP6DATAchecksum(ip6, ptr, len) == 0) {
ExitWithBadChecksumError("icmp6");
}
AnalyzeIcmp6(ptr, lest);
}
else if (ip6->ip6_nxt == IPPROTO_TCP) { // next header
len =ntohs(ip6->ip6_plen); // payload length
if (checkIPDATAchecksum(ip6, ptr, len) == 0) {
ExitWithBadChecksumError("tcp6");
}
AnalyzeTcp(ptr, lest);
}
else if (ip6->ip6_nxt == IPPROTO_UDP) {
len = ntohs(ip6->ip6_plen);
if (checkIP6DATAchecksum(ip6, ptr, len) == 0) {
ExitWithBadChecksumError("udp6");
}
AnalyzeUdp(ptr, lest);
}
return 0;
}
