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RE: [rohc] TCP compression profile (described using ROHC-FN)
... and for comparison, the TCP/IP packet formats described using ROHC-FN are as follows:
tcp_ip_encoding ::= create_msn
inferred_ip_checksum
ip_header
tcp_header
other_fields
ip_header ::= ip_version
ip_header_length
ip_tos
ip_length
ip_id
ip_reserved
ip_dont_fragment
ip_more_fragments
ip_offset
ip_time_to_live
ip_protocol
ip_checksum
ip_source_address
ip_dest_address
tcp_header ::= tcp_source_port
tcp_dest_port
tcp_seq_ack
tcp_data_offset
tcp_reserved
tcp_ecn
tcp_urg
tcp_ack
tcp_psh
tcp_rsf
tcp_window
tcp_checksum
tcp_urg_pointer
tcp_options
other_fields ::= next_field (MSN)
lsb (3, 0) / irregular (16)
ip_version ::= value (4, 4)
ip_header_length ::= value (4, 5)
ip_tos ::= static / irregular (6)
label (2, ECN)
ip_length ::= inferred_size (16, -48)
ip_id ::= inferred_offset (16, MSN)
lsb (4, 0) / lsb (8, 0) / irregular (16)
ip_reserved ::= value (1, 0)
ip_dont_fragment ::= static / irregular (1)
ip_more_fragments ::= value (1, 0)
ip_offset ::= value (13, 0)
ip_time_to_live ::= static / irregular (8)
ip_protocol ::= value (8, 6)
ip_checksum ::= skip (16)
ip_source_address ::= static / irregular (32)
ip_dest_address ::= static / irregular (32)
tcp_source_port ::= static / irregular (16)
tcp_dest_port ::= static / irregular (16)
tcp_seq_ack ::= tcp_sack_a / tcp_sack_b /
tcp_sack_c / tcp_sack_d /
tcp_sack_e / tcp_sack_f /
tcp_sack_g / tcp_sack_h /
tcp_sack_i
tcp_sack_a ::= static
static
tcp_sack_b ::= static
lsb (10, 256)
tcp_sack_c ::= lsb (10, 256)
static
tcp_sack_d ::= lsb (10, 256)
lsb (10, 256)
tcp_sack_e ::= static
lsb (14, 4096)
tcp_sack_f ::= lsb (14, 4096)
static
tcp_sack_g ::= static
lsb (18, 65536)
tcp_sack_h ::= lsb (18, 65536)
static
tcp_sack_i ::= irregular (32)
irregular (32)
tcp_data_offset ::= label (4, TCP_Header_Length)
tcp_reserved ::= static / irregular (4)
tcp_ecn ::= ecn_unused / ecn_used
ecn_unused ::= next_field (ECN)
value (2, 0)
value (2, 0)
ecn_used ::= next_field (ECN)
irregular (2)
irregular (2)
tcp_urg ::= label (1, URG_Flag)
tcp_ack ::= static / irregular (1)
tcp_psh ::= irregular (1)
tcp_rsf ::= value (3, 0) / value (3, 4) / value (3, 1) / irregular (3)
tcp_window ::= static / lsb (12, 2048) / irregular (16)
tcp_checksum ::= irregular (16)
tcp_urg_pointer ::= next_field (URG_Flag)
urgf_zero / urgf_one
urgf_zero ::= value (1, 0)
static
urgf_one ::= irregular (1)
irregular (16)
tcp_options ::= value (options_length, context_value (Index)) /
irregular (options_length)
next_field (TCP_Header_Length)
static / irregular (4)
where options_length is (TCP_Header_Length * 32) - 160
> -----Original Message-----
> From: Lars-Erik Jonsson (EAB)
> [mailto:Lars-Erik.Jonsson@epl.ericsson.se]
> Sent: Tuesday, March 11, 2003 10:16 PM
> To: Price, Richard; 'rohc@ietf.org'
> Subject: RE: [rohc] TCP compression profile
>
>
> > > Can you send the TCP packet formats you used to the mailing list?
> >
> > No problem. Would you like them in notated or pictorial form (or
> > both, for comparison)?
> >
> > If you'd like the packet formats in pictorial form, are the pictures
> > themselves sufficient or should all of the ancillary information
> > needed to get "bits on the wire" also be included (e.g. field
> > dependencies, interpretation intervals for LSB encoding, context
> > updating properties etc.)?
>
> I think the pictorial form would be ok also without the "rules" for how
> to interpret the bits. Together with the notation form, it would be a
> good example.
>
> Thanks!
> /L-E
>
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