ROHC compression context for the ROHCv2 IP/ESP profile. More...
#include "rohc_comp_internals.h"#include "rohc_traces.h"#include "rohc_traces_internal.h"#include "rohc_debug.h"#include "rohc_bit_ops.h"#include "protocols/ip_numbers.h"#include "protocols/ip.h"#include "protocols/rfc5225.h"#include "schemes/cid.h"#include "schemes/ipv6_exts.h"#include "schemes/ip_ctxt.h"#include "schemes/comp_wlsb.h"#include "schemes/ip_id_offset.h"#include "schemes/rfc4996.h"#include "crc.h"#include "sdvl.h"#include <assert.h>
Include dependency graph for comp_rfc5225_ip_esp.c:
Data Structures | |
| struct | comp_rfc5225_tmp_variables |
| Define the RFC5225-specific temporary variables in the profile compression context. More... | |
| struct | rohc_comp_rfc5225_ip_esp_ctxt |
Functions | |
| static bool | rohc_comp_rfc5225_ip_esp_create (struct rohc_comp_ctxt *const context, const struct rohc_pkt_hdrs *const uncomp_pkt_hdrs) |
| Create a new ROHCv2 IP/ESP context and initialize it thanks to the given uncompressed packet. More... | |
| static void | rohc_comp_rfc5225_ip_esp_destroy (struct rohc_comp_ctxt *const context) |
| Destroy the ROHCv2 IP/ESP context. More... | |
| static int | rohc_comp_rfc5225_ip_esp_encode (struct rohc_comp_ctxt *const context, const struct rohc_pkt_hdrs *const uncomp_pkt_hdrs, uint8_t *const rohc_pkt, const size_t rohc_pkt_max_len, rohc_packet_t *const packet_type) |
| Encode an uncompressed packet according to a pattern decided by several different factors. More... | |
| static void | rohc_comp_rfc5225_ip_esp_detect_changes (struct rohc_comp_ctxt *const context, const struct rohc_pkt_hdrs *const uncomp_pkt_hdrs) |
| Detect changes between packet and context. More... | |
| static void | rohc_comp_rfc5225_ip_esp_detect_changes_ipv4 (struct rohc_comp_ctxt *const ctxt, ip_context_t *const ip_ctxt, const struct ipv4_hdr *const ipv4, const bool is_innermost) |
| Detect changes for the given IPv4 header between packet and context. More... | |
| static int | rohc_comp_rfc5225_ip_esp_code_IR_pkt (const struct rohc_comp_ctxt *context, const struct rohc_pkt_hdrs *const uncomp_pkt_hdrs, uint8_t *const rohc_pkt, const size_t rohc_pkt_max_len) |
| Encode an IP packet as IR packet. More... | |
| static int | rohc_comp_rfc5225_ip_esp_code_co_repair_pkt (const struct rohc_comp_ctxt *context, const struct rohc_pkt_hdrs *const uncomp_pkt_hdrs, uint8_t *const rohc_pkt, const size_t rohc_pkt_max_len) |
| Encode an IP packet as co_repair packet. More... | |
| static int | rohc_comp_rfc5225_ip_esp_code_CO_pkt (const struct rohc_comp_ctxt *const context, const struct rohc_pkt_hdrs *const uncomp_pkt_hdrs, uint8_t *const rohc_pkt, const size_t rohc_pkt_max_len, const rohc_packet_t packet_type) |
| Encode an IP packet as CO packet. More... | |
| static int | rohc_comp_rfc5225_ip_esp_build_pt_0_crc3_pkt (const struct rohc_comp_ctxt *const context, const uint8_t crc, uint8_t *const rohc_data, const size_t rohc_max_len) |
| Build a ROHCv2 pt_0_crc3 packet. More... | |
| static int | rohc_comp_rfc5225_ip_esp_build_pt_0_crc7_pkt (const struct rohc_comp_ctxt *const context, const uint8_t crc, uint8_t *const rohc_data, const size_t rohc_max_len) |
| Build a ROHCv2 pt_0_crc7 packet. More... | |
| static int | rohc_comp_rfc5225_ip_esp_build_pt_1_seq_id_pkt (const struct rohc_comp_ctxt *const context, const uint8_t crc, uint8_t *const rohc_data, const size_t rohc_max_len) |
| Build a ROHCv2 pt_1_seq_id packet. More... | |
| static int | rohc_comp_rfc5225_ip_esp_build_pt_2_seq_id_pkt (const struct rohc_comp_ctxt *const context, const uint8_t crc, uint8_t *const rohc_data, const size_t rohc_max_len) |
| Build a ROHCv2 pt_2_seq_id packet. More... | |
| static int | rohc_comp_rfc5225_ip_esp_build_co_common_pkt (const struct rohc_comp_ctxt *const context, const uint8_t crc, uint8_t *const rohc_data, const size_t rohc_max_len) |
| Build a ROHCv2 co_common packet. More... | |
| static int | rohc_comp_rfc5225_ip_esp_static_chain (const struct rohc_comp_ctxt *const ctxt, const struct rohc_pkt_hdrs *const uncomp_pkt_hdrs, uint8_t *const rohc_pkt, const size_t rohc_pkt_max_len) |
| Code the static chain of an ROHCv2 IP/ESP IR packet. More... | |
| static int | rohc_comp_rfc5225_ip_esp_static_ipv4_part (const struct rohc_comp_ctxt *const ctxt, const struct ipv4_hdr *const ipv4, const bool is_innermost, uint8_t *const rohc_data, const size_t rohc_max_len) |
| Build the static part of the IPv4 header. More... | |
| static int | rohc_comp_rfc5225_ip_esp_static_ipv6_part (const struct rohc_comp_ctxt *const ctxt, const struct ipv6_hdr *const ipv6, const bool is_innermost, uint8_t *const rohc_data, const size_t rohc_max_len) |
| Build the static part of the IPv6 header. More... | |
| static int | rohc_comp_rfc5225_ip_esp_static_esp_part (const struct rohc_comp_ctxt *const ctxt, const struct esphdr *const esp, uint8_t *const rohc_data, const size_t rohc_max_len) |
| Build the static part of the ESP header. More... | |
| static int | rohc_comp_rfc5225_ip_esp_dyn_chain (const struct rohc_comp_ctxt *const ctxt, const struct rohc_pkt_hdrs *const uncomp_pkt_hdrs, uint8_t *const rohc_pkt, const size_t rohc_pkt_max_len) |
| Code the dynamic chain of a ROHCv2 IP/ESP IR packet. More... | |
| static int | rohc_comp_rfc5225_ip_esp_dyn_ipv4_part (const struct rohc_comp_ctxt *const ctxt, const ip_context_t *const ip_ctxt, const struct ipv4_hdr *const ipv4, uint8_t *const rohc_data, const size_t rohc_max_len) |
| Build the dynamic part of the IPv4 header. More... | |
| static int | rohc_comp_rfc5225_ip_esp_dyn_ipv6_part (const struct rohc_comp_ctxt *const ctxt, const ip_context_t *const ip_ctxt, const struct ipv6_hdr *const ipv6, uint8_t *const rohc_data, const size_t rohc_max_len) |
| Build the dynamic part of the IPv6 header. More... | |
| static int | rohc_comp_rfc5225_ip_esp_dyn_esp_part (const struct rohc_comp_ctxt *const ctxt, const struct esphdr *const esp, uint8_t *const rohc_data, const size_t rohc_max_len) |
| Build the dynamic part of the ESP header. More... | |
| static int | rohc_comp_rfc5225_ip_esp_irreg_chain (const struct rohc_comp_ctxt *const ctxt, const struct rohc_pkt_hdrs *const uncomp_pkt_hdrs, uint8_t *const rohc_pkt, const size_t rohc_pkt_max_len) |
| Code the irregular chain of a ROHCv2 IP/ESP IR packet. More... | |
| static int | rohc_comp_rfc5225_ip_esp_irreg_ipv4_part (const struct rohc_comp_ctxt *const ctxt, const ip_context_t *const ip_ctxt, const struct ipv4_hdr *const ipv4, const bool is_innermost, uint8_t *const rohc_data, const size_t rohc_max_len) |
| Build the irregular part of the IPv4 header. More... | |
| static int | rohc_comp_rfc5225_ip_esp_irreg_ipv6_part (const struct rohc_comp_ctxt *const ctxt, const ip_context_t *const ip_ctxt, const struct ipv6_hdr *const ipv6, const bool is_innermost, uint8_t *const rohc_data, const size_t rohc_max_len) |
| Build the irregular part of the IPv6 header. More... | |
| static bool | rohc_comp_rfc5225_ip_esp_feedback (struct rohc_comp_ctxt *const ctxt, const enum rohc_feedback_type feedback_type, const uint8_t *const packet, const size_t packet_len, const uint8_t *const feedback_data, const size_t feedback_data_len) |
| Update the profile when feedback is received. More... | |
| static bool | rohc_comp_rfc5225_ip_esp_feedback_2 (struct rohc_comp_ctxt *const ctxt, const uint8_t *const packet, const size_t packet_len, const uint8_t *const feedback_data, const size_t feedback_data_len) |
| Update the profile when FEEDBACK-2 is received. More... | |
| static void | rohc_comp_rfc5225_ip_esp_feedback_ack (struct rohc_comp_ctxt *const ctxt, const uint32_t sn_bits, const size_t sn_bits_nr, const bool sn_not_valid) |
| Perform the required actions after the reception of a positive ACK. More... | |
| static rohc_packet_t | rohc_comp_rfc5225_ip_esp_decide_pkt (struct rohc_comp_ctxt *const context) |
| Decide which packet to send when in the different states. More... | |
| static rohc_packet_t | rohc_comp_rfc5225_ip_esp_decide_FO_pkt (const struct rohc_comp_ctxt *const ctxt) |
| Decide which packet to send when in FO state. More... | |
| static rohc_packet_t | rohc_comp_rfc5225_ip_esp_decide_SO_pkt (const struct rohc_comp_ctxt *const ctxt) |
| Decide which packet to send when in SO state. More... | |
| static rohc_packet_t | rohc_comp_rfc5225_ip_esp_decide_FO_SO_pkt (const struct rohc_comp_ctxt *const ctxt, const bool crc7_at_least) |
| Decide which packet to send when in FO or SO state. More... | |
| static bool | rohc_comp_rfc5225_is_msn_lsb_possible (const struct c_wlsb *const wlsb, const uint32_t value, const rohc_reordering_offset_t reorder_ratio, const size_t k) |
| Define according to computed shift parameter if msn_lsb() is possible. More... | |
| static bool | rohc_comp_rfc5225_is_ipid_sequential (const rohc_ip_id_behavior_t behavior) |
| Whether the given IP-ID is sequential (swapped or not) More... | |
| static bool | rohc_comp_rfc5225_is_seq_ipid_inferred (const ip_context_t *const ip_ctxt, const uint8_t ip_id_offset_trans_nr, const uint8_t oa_repetitions_nr, const uint16_t new_ip_id, const int32_t msn_offset) |
| Whether the given IP-ID is inferred from SN. More... | |
| static bool | sdvl_sn_lsb_encode (uint8_t *const sdvl_bytes, const size_t sdvl_bytes_max_nr, size_t *const sdvl_bytes_nr, const struct c_wlsb *const sn_wlsb, const rohc_reordering_offset_t reorder_ratio, const uint32_t sn) |
| Encode a SN value using the sdvl_sn_lsb encoding. More... | |
Variables | |
| const struct rohc_comp_profile | rohc_comp_rfc5225_ip_esp_profile |
| Define the compression part of the ROHCv2 IP/ESP profile as described in the RFC 5225. More... | |
Detailed Description
ROHC compression context for the ROHCv2 IP/ESP profile.
Function Documentation
◆ rohc_comp_rfc5225_ip_esp_build_co_common_pkt()
|
static |
Build a ROHCv2 co_common packet.
- Parameters
-
context The compression context crc The CRC on the uncompressed headers [out] rohc_data The ROHC packet being built rohc_max_len The max remaining length in the ROHC buffer
- Returns
- The length appended in the ROHC buffer if positive, -1 in case of error
◆ rohc_comp_rfc5225_ip_esp_build_pt_0_crc3_pkt()
|
static |
Build a ROHCv2 pt_0_crc3 packet.
- Parameters
-
context The compression context crc The CRC on the uncompressed headers [out] rohc_data The ROHC packet being built rohc_max_len The max remaining length in the ROHC buffer
- Returns
- The length appended in the ROHC buffer if positive, -1 in case of error
◆ rohc_comp_rfc5225_ip_esp_build_pt_0_crc7_pkt()
|
static |
Build a ROHCv2 pt_0_crc7 packet.
- Parameters
-
context The compression context crc The CRC on the uncompressed headers [out] rohc_data The ROHC packet being built rohc_max_len The max remaining length in the ROHC buffer
- Returns
- The length appended in the ROHC buffer if positive, -1 in case of error
◆ rohc_comp_rfc5225_ip_esp_build_pt_1_seq_id_pkt()
|
static |
Build a ROHCv2 pt_1_seq_id packet.
- Parameters
-
context The compression context crc The CRC on the uncompressed headers [out] rohc_data The ROHC packet being built rohc_max_len The max remaining length in the ROHC buffer
- Returns
- The length appended in the ROHC buffer if positive, -1 in case of error
◆ rohc_comp_rfc5225_ip_esp_build_pt_2_seq_id_pkt()
|
static |
Build a ROHCv2 pt_2_seq_id packet.
- Parameters
-
context The compression context crc The CRC on the uncompressed headers [out] rohc_data The ROHC packet being built rohc_max_len The max remaining length in the ROHC buffer
- Returns
- The length appended in the ROHC buffer if positive, -1 in case of error
◆ rohc_comp_rfc5225_ip_esp_code_CO_pkt()
|
static |
Encode an IP packet as CO packet.
- Parameters
-
context The compression context uncomp_pkt_hdrs The uncompressed headers to encode rohc_pkt OUT: The ROHC packet rohc_pkt_max_len The maximum length of the ROHC packet packet_type The type of ROHC packet to create
- Returns
- The length of the ROHC packet if successful, -1 otherwise
◆ rohc_comp_rfc5225_ip_esp_code_co_repair_pkt()
|
static |
Encode an IP packet as co_repair packet.
0 1 2 3 4 5 6 7
--- --- --- --- --- --- --- ---
: Add-CID octet : if for small CIDs and CID 1-15
+---+---+---+---+---+---+---+---+
| 1 1 1 1 1 0 1 1 | discriminator
+---+---+---+---+---+---+---+---+
: :
/ 0, 1, or 2 octets of CID / 1-2 octets if large CIDs
: :
+---+---+---+---+---+---+---+---+
|r1 | CRC-7 |
+---+---+---+---+---+---+---+---+
| r2 | CRC-3 |
+---+---+---+---+---+---+---+---+
| |
/ Dynamic chain / variable length
| |
- - - - - - - - - - - - - - - -- Parameters
-
context The compression context uncomp_pkt_hdrs The uncompressed headers to encode rohc_pkt OUT: The ROHC packet rohc_pkt_max_len The maximum length of the ROHC packet
- Returns
- The length of the ROHC packet if successful, -1 otherwise
◆ rohc_comp_rfc5225_ip_esp_code_IR_pkt()
|
static |
Encode an IP packet as IR packet.
- Parameters
-
context The compression context uncomp_pkt_hdrs The uncompressed headers to encode rohc_pkt OUT: The ROHC packet rohc_pkt_max_len The maximum length of the ROHC packet
- Returns
- The length of the ROHC packet if successful, -1 otherwise
◆ rohc_comp_rfc5225_ip_esp_create()
|
static |
Create a new ROHCv2 IP/ESP context and initialize it thanks to the given uncompressed packet.
This function is one of the functions that must exist in one profile for the framework to work.
- Parameters
-
context The compression context uncomp_pkt_hdrs The uncompressed headers to initialize the new context
- Returns
- true if successful, false otherwise
◆ rohc_comp_rfc5225_ip_esp_decide_FO_pkt()
|
static |
Decide which packet to send when in FO state.
- Parameters
-
ctxt The compression context
- Returns
- The packet type among ROHC_PACKET_IR, ROHC_PACKET_CO_REPAIR, ROHC_PACKET_CO_COMMON, ROHC_PACKET_NORTP_PT_0_CRC7, or ROHC_PACKET_NORTP_PT_2_SEQ_ID in case of success
- ROHC_PACKET_UNKNOWN in case of failure
◆ rohc_comp_rfc5225_ip_esp_decide_FO_SO_pkt()
|
static |
Decide which packet to send when in FO or SO state.
- Parameters
-
ctxt The compression context crc7_at_least Whether packet types with CRC strictly smaller than 7 bits are allowed or not
- Returns
- The packet type among ROHC_PACKET_IR, ROHC_PACKET_CO_REPAIR, ROHC_PACKET_CO_COMMON, ROHC_PACKET_PT_0_CRC3, ROHC_PACKET_NORTP_PT_0_CRC7, ROHC_PACKET_NORTP_PT_1_SEQ_ID, or ROHC_PACKET_NORTP_PT_2_SEQ_ID in case of success
- ROHC_PACKET_UNKNOWN in case of failure
◆ rohc_comp_rfc5225_ip_esp_decide_pkt()
|
static |
Decide which packet to send when in the different states.
- Parameters
-
context The compression context
- Returns
- The packet type among ROHC_PACKET_IR, ROHC_PACKET_PT_0_CRC3, ROHC_PACKET_NORTP_PT_0_CRC7, ROHC_PACKET_NORTP_PT_1_SEQ_ID, or ROHC_PACKET_NORTP_PT_2_SEQ_ID in case of success
- ROHC_PACKET_UNKNOWN in case of failure
◆ rohc_comp_rfc5225_ip_esp_decide_SO_pkt()
|
static |
Decide which packet to send when in SO state.
- Parameters
-
ctxt The compression context
- Returns
- The packet type among ROHC_PACKET_IR, ROHC_PACKET_CO_REPAIR, ROHC_PACKET_CO_COMMON, ROHC_PACKET_PT_0_CRC3, ROHC_PACKET_NORTP_PT_0_CRC7, ROHC_PACKET_NORTP_PT_1_SEQ_ID, or ROHC_PACKET_NORTP_PT_2_SEQ_ID in case of success
- ROHC_PACKET_UNKNOWN in case of failure
◆ rohc_comp_rfc5225_ip_esp_destroy()
|
static |
Destroy the ROHCv2 IP/ESP context.
This function is one of the functions that must exist in one profile for the framework to work.
- Parameters
-
context The ROHCv2 IP/ESP compression context to destroy
◆ rohc_comp_rfc5225_ip_esp_detect_changes()
|
static |
Detect changes between packet and context.
- Parameters
-
context The compression context to compare uncomp_pkt_hdrs The uncompressed headers to compare
◆ rohc_comp_rfc5225_ip_esp_detect_changes_ipv4()
|
static |
Detect changes for the given IPv4 header between packet and context.
- Parameters
-
ctxt The compression context ip_ctxt The IPv4 context to compare ipv4 The IPv4 header to compare is_innermost Whether the IPv4 header is the innermost of all IP headers
◆ rohc_comp_rfc5225_ip_esp_dyn_chain()
|
static |
Code the dynamic chain of a ROHCv2 IP/ESP IR packet.
- Parameters
-
ctxt The compression context uncomp_pkt_hdrs The uncompressed headers to encode rohc_pkt OUT: The ROHC packet rohc_pkt_max_len The maximum length of the ROHC packet
- Returns
- The length of the ROHC packet if successful, -1 otherwise
◆ rohc_comp_rfc5225_ip_esp_dyn_esp_part()
|
static |
Build the dynamic part of the ESP header.
- Parameters
-
ctxt The compression context esp The ESP header [out] rohc_data The ROHC packet being built rohc_max_len The max remaining length in the ROHC buffer
- Returns
- The length appended in the ROHC buffer if positive, -1 in case of error
◆ rohc_comp_rfc5225_ip_esp_dyn_ipv4_part()
|
static |
Build the dynamic part of the IPv4 header.
- Parameters
-
ctxt The compression context ip_ctxt The specific IP compression context ipv4 The IPv4 header [out] rohc_data The ROHC packet being built rohc_max_len The max remaining length in the ROHC buffer
- Returns
- The length appended in the ROHC buffer if positive, -1 in case of error
◆ rohc_comp_rfc5225_ip_esp_dyn_ipv6_part()
|
static |
Build the dynamic part of the IPv6 header.
- Parameters
-
ctxt The compression context ip_ctxt The specific IP compression context ipv6 The IPv6 header [out] rohc_data The ROHC packet being built rohc_max_len The max remaining length in the ROHC buffer
- Returns
- The length appended in the ROHC buffer if positive, -1 in case of error
◆ rohc_comp_rfc5225_ip_esp_encode()
|
static |
Encode an uncompressed packet according to a pattern decided by several different factors.
- Decide which packet type to send.
- Code packet
- Update context
This function is one of the functions that must exist in one profile for the framework to work.
- Parameters
-
context The compression context uncomp_pkt_hdrs The uncompressed headers to encode rohc_pkt OUT: The ROHC packet rohc_pkt_max_len The maximum length of the ROHC packet packet_type OUT: The type of ROHC packet that is created
- Returns
- The length of the ROHC packet if successful, -1 otherwise
◆ rohc_comp_rfc5225_ip_esp_feedback()
|
static |
Update the profile when feedback is received.
This function is one of the functions that must exist in one profile for the framework to work.
- Parameters
-
ctxt The compression context feedback_type The feedback type among ROHC_FEEDBACK_1 and ROHC_FEEDBACK_2 packet The whole feedback packet with CID bits packet_len The length of the whole feedback packet with CID bits feedback_data The feedback data without the CID bits feedback_data_len The length of the feedback data without the CID bits
- Returns
- true if the feedback was successfully handled, false if the feedback could not be taken into account
◆ rohc_comp_rfc5225_ip_esp_feedback_2()
|
static |
Update the profile when FEEDBACK-2 is received.
- Parameters
-
ctxt The compression context packet The whole feedback packet with CID bits packet_len The length of the whole feedback packet with CID bits feedback_data The feedback data without the CID bits feedback_data_len The length of the feedback data without the CID bits
- Returns
- true if the feedback was successfully handled, false if the feedback could not be taken into account
◆ rohc_comp_rfc5225_ip_esp_feedback_ack()
|
static |
Perform the required actions after the reception of a positive ACK.
- Parameters
-
ctxt The compression context that received a positive ACK sn_bits The LSB bits of the acknowledged SN sn_bits_nr The number of LSB bits of the acknowledged SN sn_not_valid Whether the received SN may be considered as valid or not
◆ rohc_comp_rfc5225_ip_esp_irreg_chain()
|
static |
Code the irregular chain of a ROHCv2 IP/ESP IR packet.
- Parameters
-
ctxt The compression context uncomp_pkt_hdrs The uncompressed headers to encode rohc_pkt OUT: The ROHC packet rohc_pkt_max_len The maximum length of the ROHC packet
- Returns
- The length of the ROHC packet if successful, -1 otherwise
◆ rohc_comp_rfc5225_ip_esp_irreg_ipv4_part()
|
static |
Build the irregular part of the IPv4 header.
- Parameters
-
ctxt The compression context ip_ctxt The specific IP compression context ipv4 The IPv4 header is_innermost true if the IP header is the innermost of the packet, false otherwise [out] rohc_data The ROHC packet being built rohc_max_len The max remaining length in the ROHC buffer
- Returns
- The length appended in the ROHC buffer if positive, -1 in case of error
◆ rohc_comp_rfc5225_ip_esp_irreg_ipv6_part()
|
static |
Build the irregular part of the IPv6 header.
- Parameters
-
ctxt The compression context ip_ctxt The specific IP compression context ipv6 The IPv6 header is_innermost true if the IP header is the innermost of the packet, false otherwise [out] rohc_data The ROHC packet being built rohc_max_len The max remaining length in the ROHC buffer
- Returns
- The length appended in the ROHC buffer if positive, -1 in case of error
◆ rohc_comp_rfc5225_ip_esp_static_chain()
|
static |
Code the static chain of an ROHCv2 IP/ESP IR packet.
- Parameters
-
ctxt The compression context uncomp_pkt_hdrs The uncompressed headers to encode rohc_pkt OUT: The ROHC packet rohc_pkt_max_len The maximum length of the ROHC packet
- Returns
- The length of the ROHC packet if successful, -1 otherwise
◆ rohc_comp_rfc5225_ip_esp_static_esp_part()
|
static |
Build the static part of the ESP header.
- Parameters
-
ctxt The compression context esp The ESP header [out] rohc_data The ROHC packet being built rohc_max_len The max remaining length in the ROHC buffer
- Returns
- The length appended in the ROHC buffer if positive, -1 in case of error
◆ rohc_comp_rfc5225_ip_esp_static_ipv4_part()
|
static |
Build the static part of the IPv4 header.
- Parameters
-
ctxt The compression context ipv4 The IPv4 header is_innermost Whether the IPv4 header is the innermost IP header [out] rohc_data The ROHC packet being built rohc_max_len The max remaining length in the ROHC buffer
- Returns
- The length appended in the ROHC buffer if positive, -1 in case of error
◆ rohc_comp_rfc5225_ip_esp_static_ipv6_part()
|
static |
Build the static part of the IPv6 header.
- Parameters
-
ctxt The compression context ipv6 The IPv6 header is_innermost Whether the IPv6 header is the innermost IP header [out] rohc_data The ROHC packet being built rohc_max_len The max remaining length in the ROHC buffer
- Returns
- The length appended in the ROHC buffer if positive, -1 in case of error
◆ rohc_comp_rfc5225_is_ipid_sequential()
|
static |
Whether the given IP-ID is sequential (swapped or not)
- Parameters
-
behavior The IP-ID behavior
- Returns
- true if the given IP-ID behavior is sequential or sequential swapped, false otherwise
◆ rohc_comp_rfc5225_is_msn_lsb_possible()
|
static |
Define according to computed shift parameter if msn_lsb() is possible.
- Parameters
-
wlsb The W-LSB object value The value to encode using the LSB algorithm reorder_ratio The reordering ratio k The number of bits for encoding
- Returns
- true if msn_lsb is possible or not
◆ rohc_comp_rfc5225_is_seq_ipid_inferred()
|
static |
Whether the given IP-ID is inferred from SN.
The given IP-ID is inferred from SN if:
- the IP header is IPv4,
- the IP-ID / SN offset was transmitted enough times to gain confidence that the decompressor received the value,
- the IP-ID behavior is sequential or sequential swapped,
- the new IP-ID value increases from the last IP-ID by the same delta as the MSN.
- Parameters
-
ip_ctxt The context for the given IP header ip_id_offset_trans_nr The number of IP-ID offset transmissions oa_repetitions_nr The number of repetitions for Optimistic Approach new_ip_id The new value of the IP-ID msn_offset The offset between the previous and current MSN
- Returns
- true if the given IP-ID is sequential and inferred from MSN, false otherwise
◆ sdvl_sn_lsb_encode()
|
static |
Encode a SN value using the sdvl_sn_lsb encoding.
See page 72 in the RFC 5525 for details about the sdvl_sn_lsb encoding.
- Parameters
-
sdvl_bytes IN/OUT: The SDVL-encoded bytes sdvl_bytes_max_nr The maximum available free bytes for SDVL sdvl_bytes_nr OUT: The number of SDVL bytes written sn_wlsb The W-LSB object for the SN reorder_ratio The reorder ratio sn The SN value to encode
- Returns
- true if SDVL encoding is successful, false in case of failure
Variable Documentation
◆ rohc_comp_rfc5225_ip_esp_profile
| const struct rohc_comp_profile rohc_comp_rfc5225_ip_esp_profile |
Initial value:
=
{
.id = ROHCv2_PROFILE_IP_ESP,
.create = rohc_comp_rfc5225_ip_esp_create,
.clone = NULL,
.destroy = rohc_comp_rfc5225_ip_esp_destroy,
.encode = rohc_comp_rfc5225_ip_esp_encode,
.feedback = rohc_comp_rfc5225_ip_esp_feedback,
}
static void rohc_comp_rfc5225_ip_esp_destroy(struct rohc_comp_ctxt *const context)
Destroy the ROHCv2 IP/ESP context.
Definition: comp_rfc5225_ip_esp.c:473
static bool rohc_comp_rfc5225_ip_esp_feedback(struct rohc_comp_ctxt *const ctxt, const enum rohc_feedback_type feedback_type, const uint8_t *const packet, const size_t packet_len, const uint8_t *const feedback_data, const size_t feedback_data_len)
Update the profile when feedback is received.
Definition: comp_rfc5225_ip_esp.c:1085
static bool rohc_comp_rfc5225_ip_esp_create(struct rohc_comp_ctxt *const context, const struct rohc_pkt_hdrs *const uncomp_pkt_hdrs)
Create a new ROHCv2 IP/ESP context and initialize it thanks to the given uncompressed packet...
Definition: comp_rfc5225_ip_esp.c:366
static int rohc_comp_rfc5225_ip_esp_encode(struct rohc_comp_ctxt *const context, const struct rohc_pkt_hdrs *const uncomp_pkt_hdrs, uint8_t *const rohc_pkt, const size_t rohc_pkt_max_len, rohc_packet_t *const packet_type)
Encode an uncompressed packet according to a pattern decided by several different factors...
Definition: comp_rfc5225_ip_esp.c:502
Definition: rohc_profiles.h:121
Define the compression part of the ROHCv2 IP/ESP profile as described in the RFC 5225.
