["swati desai" <swatidesai5584@xxxxxxxxxxxxxx>]

i want to know that when an ICMP port unreachable packets is 
viewed in ethereal :
Frame 137 (300 bytes on wire, 300 bytes captured)
    Arrival Time: Mar 11, 1999 14:46:01.962117000
    Time delta from previous packet: 0.001071000 seconds
    Time relative to first packet: 59.820360000 seconds
    Frame Number: 137
    Packet Length: 300 bytes
    Capture Length: 300 bytes
    File Offset: 24436 (0x5f74)
Ethernet II, Src: 00:00:86:05:80:da, Dst: 00:60:97:07:69:ea
    Destination: 00:60:97:07:69:ea (00:60:97:07:69:ea)
    Source: 00:00:86:05:80:da (00:00:86:05:80:da)
    Type: IPv6 (0x86dd)
Internet Protocol Version 6
    Version: 6
    Traffic class: 0x00
    Flowlabel: 0x00000
    Payload length: 246
    Next header: ICMPv6 (0x3a)
    Hop limit: 64
    Source address: 3ffe:507:0:1:200:86ff:fe05:80da
    Destination address: 3ffe:501:4819::42
Internet Control Message Protocol v6
    Type: 1 (Unreachable)
    Code: 4 (Port unreachable)
    Checksum: 0xb1b5 (correct)
    Internet Protocol Version 6
        Version: 6
        Traffic class: 0x00
        Flowlabel: 0x00000
        Payload length: 198
        Next header: UDP (0x11)
        Hop limit: 230
        Source address: 3ffe:501:4819::42
        Destination address: 3ffe:507:0:1:200:86ff:fe05:80da
    User Datagram Protocol, Src Port: 53 (53), Dst Port: 2410 
(2410)
        Source port: 53 (53)
        Destination port: 2410 (2410)
        Length: 198
        Checksum: 0x1e36 (correct)
 1st we create ethlen =sizeof(struct ether_header);
iplen =sizeof(struct iphdr);
udplen =sizeof(struct udphdr);
icmplen=sizeof(struct icmphdr);
than how to extract the source and destination port from this icmp 
packet.plz help me