Handle the list of TCP options for the TCP ompression profile. More...
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Data Structures | |
| struct | c_tcp_opt_ctxt |
| The compression context for one TCP option. More... | |
| struct | c_tcp_opts_ctxt_tmp |
| struct | c_tcp_opts_ctxt |
Macros | |
| #define | MAX_TCP_OPT_SIZE 40U |
Functions | |
| bool | rohc_comp_tcp_are_options_acceptable (const struct rohc_comp *const comp, const uint8_t *const opts, const size_t data_offset) |
| Whether TCP options are acceptable for TCP profile or not. More... | |
| bool | tcp_detect_options_changes (struct rohc_comp_ctxt *const context, const struct tcphdr *const tcp, struct c_tcp_opts_ctxt *const opts_ctxt, size_t *const opts_len) |
| Parse the uncompressed TCP options for changes. More... | |
| int | c_tcp_code_tcp_opts_list_item (const struct rohc_comp_ctxt *const context, const struct tcphdr *const tcp, const uint16_t msn, const bool is_dynamic_chain, struct c_tcp_opts_ctxt *const opts_ctxt, uint8_t *const comp_opts, const size_t comp_opts_max_len) |
| Build the list of TCP options items. More... | |
| int | c_tcp_code_tcp_opts_irreg (const struct rohc_comp_ctxt *const context, const struct tcphdr *const tcp, const uint16_t msn, struct c_tcp_opts_ctxt *const opts_ctxt, uint8_t *const comp_opts, const size_t comp_opts_max_len) |
| Build the list of TCP options for the irregular chain. More... | |
Detailed Description
Handle the list of TCP options for the TCP ompression profile.
Macro Definition Documentation
| #define MAX_TCP_OPT_SIZE 40U |
The maximum size (in bytes) of one TCP option
Function Documentation
| int c_tcp_code_tcp_opts_irreg | ( | const struct rohc_comp_ctxt *const | context, |
| const struct tcphdr *const | tcp, | ||
| const uint16_t | msn, | ||
| struct c_tcp_opts_ctxt *const | opts_ctxt, | ||
| uint8_t *const | comp_opts, | ||
| const size_t | comp_opts_max_len | ||
| ) |
Build the list of TCP options for the irregular chain.
All the CO packets contains an irregular chain.
- Parameters
-
context The compression context tcp The TCP header msn The Master Sequence Number (MSN) of the packet to compress [in,out] opts_ctxt The compression context for TCP options [out] comp_opts The compressed TCP options comp_opts_max_len The max remaining length in the ROHC buffer
- Returns
- The length (in bytes) of compressed TCP options in case of success, -1 in case of failure
- Todo:
- TODO: defines 'options profiles' the same way as for decompressor
| int c_tcp_code_tcp_opts_list_item | ( | const struct rohc_comp_ctxt *const | context, |
| const struct tcphdr *const | tcp, | ||
| const uint16_t | msn, | ||
| const bool | is_dynamic_chain, | ||
| struct c_tcp_opts_ctxt *const | opts_ctxt, | ||
| uint8_t *const | comp_opts, | ||
| const size_t | comp_opts_max_len | ||
| ) |
Build the list of TCP options items.
The list of TCP options is used in the dynamic chain of the IR and IR-DYN packets, but also at the end of the rnd_8, seq_8, and co_common packets.
- Parameters
-
context The compression context tcp The TCP header msn The Master Sequence Number (MSN) of the packet to compress is_dynamic_chain Whether the list of items is for the dynamic chain or not [in,out] opts_ctxt The compression context for TCP options [out] comp_opts The compressed TCP options comp_opts_max_len The max remaining length in the ROHC buffer
- Returns
- The length (in bytes) of compressed TCP options in case of success, -1 in case of failure
| bool rohc_comp_tcp_are_options_acceptable | ( | const struct rohc_comp *const | comp, |
| const uint8_t *const | opts, | ||
| const size_t | data_offset | ||
| ) |
Whether TCP options are acceptable for TCP profile or not.
TCP options are acceptable for the TCP profile if:
- the last TCP option is not truncated,
- well-known TCP options got the expected length (see below),
- no more than ROHC_TCP_OPTS_MAX options are present,
- each TCP options is present only once (except EOL and NOP).
The following well-known TCP options shall have expected lengthes:
- MSS shall be TCP_OLEN_MSS long,
- WS shall be TCP_OLEN_WS long,
- SACK Permitted shall be TCP_OLEN_SACK_PERM long,
- SACK shall be 2 + N * 8 with N in range [1, 4]
- TS shall be TCP_OLEN_TS long.
- Parameters
-
comp The ROHC compressor opts The beginning of the TCP options data_offset The length (in 32-bit words) of the full TCP header
- Returns
- true if the TCP options are acceptable, false if they are not
- See also
- ROHC_TCP_OPTS_MAX
| bool tcp_detect_options_changes | ( | struct rohc_comp_ctxt *const | context, |
| const struct tcphdr *const | tcp, | ||
| struct c_tcp_opts_ctxt *const | opts_ctxt, | ||
| size_t *const | opts_len | ||
| ) |
Parse the uncompressed TCP options for changes.
- Parameters
-
context The compression context tcp The TCP header [in,out] opts_ctxt The compression context for TCP options [out] opts_len The length (in bytes) of the TCP options
- Returns
- true if the TCP options were successfully parsed and can be compressed, false otherwise
