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NAME

ip6_opn_dissect - an internet protocol version 6 options dissect function

SYNOPSIS

opn=ip6_opn_dissect(pkt,offset,opn_end)

IP6OPT_PAD1 = 0             
IP6OPT_PADN = 1     
IP6OPT_RTALERT = 5                     
IP6OPT_JUMBO = 194           

DESCRIPTION

dissect IPv6 ' s options.  dissectable are:

Pad1    +--------+    |00000000|    +--------+	PadN    +--------+--------+- - - - - - - - -    |00000001|Data Len|  Option Data    +--------+--------+- - - - - - - - -
Router Alert    +--------+--------+--------+--------+    |00000101|00000010|Value (2 octets) |    +--------+--------+--------+--------+	Jumbograms                      +--------+--------+                      |11000010|00000100|    +--------+--------+--------+--------+    |       Jumbo Payload Length        |    +--------+--------+--------+--------+

references RFC 2460, 2711, 2675

funtion accepts three arguments:
    pkt is a packet reference containing the whole already dissected packet
    offset is the position inside packet to start dissection
    opn_end equals offset plus option length

funtion returns one list:
    opn is a list
    each item of the list is a dissected option
    this is the option's prototype: [option_code,option_length,(option_field1,option_field2,.......,option_fieldN)] 
    note: negative option_code means option exceeds global options length