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UDP ICMP IP Headers
This was created for my own reference, but feel free to use these and find any bugs in it!
IP HEADER
| 0 ... 3 |
4 ... 7 |
8 ... 11 |
12 ... 15 |
16 ... 19 |
20 ... 23 |
24 ... 27 |
28 ... 31 |
version
.ip_v |
header length
(in words)
.ip_hl |
type of service
.ip_tos |
total len
(in bytes)
.ip_len |
Identification
.ip_id |
flags(bits 16-18)
(IP_RF, IP_DF, IP_MF) |
|
offset
(bits 19-31)
(IP_OFFMASK) |
.ip_off
|
TTL
.ip_ttl |
protocol
.ip_p |
checksum
.ip_sum |
source IP
.ip_src |
dest IP
.ip_dst |
options
.??? |
| ... data ... |
ICMP HEADER
(First 2 words in the ip data area if used)
| 0 ... 7 |
8 ... 15 |
16 ... 23 |
24 ... 31 |
type
.type |
code
.code |
checksum
.checksum |
identifier
.id |
sequence number
.sequence |
| ... data ... |
UDP HEADER
(First 2 words in the ip data area if used)
| 0 ... 7 |
8 ... 15 |
16 ... 23 |
24 ... 31 |
source port
.??? |
destination port
.??? |
length
.??? |
checksum
(pseudo IP header +
UDP header +
UDP header)
.??? |
| ... UDP data ... |
PSEUDO IP HEADER
(Fields used to calculate UDP checksum)
| 0 ... 7 |
8 ... 15 |
16 ... 23 |
24 ... 31 |
| IP source address |
| IP destination address |
| zero |
protocol |
UDP length |
| UDP header |
| ... UDP data ... |
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