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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2021 Intel Corporation.
*/
#ifndef _RTE_L2TPV2_H_
#define _RTE_L2TPV2_H_
/**
* @file
*
* L2TP header:
*
* `-0--------------------1----------------2-------------------3`
*
* `-0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1`
*
* `+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+`
*
* `|T|L|x|x|S|x|O|P|x|x|x|x|--Ver--|-----------Length (opt)--------|`
*
* `+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+`
*
* `|-----------Tunnel ID-----------|-----------Session ID----------|`
*
* `+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+`
*
* `|-----------Ns (opt)------------|-----------Nr (opt)------------|`
*
* `+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+`
*
* `|---------Offset Size (opt)-----|---------Offset pad... (opt)`
*
* `+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+`
*
* The Type (T) bit indicates the type of message. It is set to 0 for a data
* message and 1 for a control message.
*
* If the Length (L) bit is 1, the Length field is present. This bit MUST be
* set to 1 for control messages.
*
* The x bits are reserved for future extensions. All reserved bits MUST
* be set to 0 on outgoing messages and ignored on incoming messages.
*
* If the Sequence (S) bit is set to 1 the Ns and Nr fields are present.
* The S bit MUST be set to 1 for control messages.
*
* If the Offset (O) bit is 1, the Offset Size field is present. The O
* bit MUST be set to 0 for control messages.
*
* If the Priority (P) bit is 1, this data message should receive
* preferential treatment in its local queuing and transmission.
* The P bit MUST be set to 0 for control messages.
*
* Ver MUST be 2, indicating the version of the L2TP data message header.
*
* The Length field indicates the total length of the message in octets.
*
* Tunnel ID indicates the identifier for the control connection.
*
* Session ID indicates the identifier for a session within a tunnel.
*
* Ns indicates the sequence number for this data or control message.
*
* Nr indicates the sequence number expected in the next control message
* to be received.
*
* The Offset Size field, if present, specifies the number of octets
* past the L2TP header at which the payload data is expected to start.
* Actual data within the offset padding is undefined. If the offset
* field is present, the L2TP header ends after the last octet of the
* offset padding.
*/
#include <stdint.h>
#include <rte_byteorder.h>
#ifdef __cplusplus
extern "C" {
#endif
/*
* L2TPv2 Message Type
*/
#define RTE_L2TPV2_MSG_TYPE_CONTROL 0xC802
#define RTE_L2TPV2_MSG_TYPE_DATA 0x0002
#define RTE_L2TPV2_MSG_TYPE_DATA_L 0x4002
#define RTE_L2TPV2_MSG_TYPE_DATA_S 0x0802
#define RTE_L2TPV2_MSG_TYPE_DATA_O 0x0202
#define RTE_L2TPV2_MSG_TYPE_DATA_L_S 0x4802
#define RTE_L2TPV2_MSG_TYPE_DATA_L_O 0x4202
#define RTE_L2TPV2_MSG_TYPE_DATA_S_O 0x0A02
#define RTE_L2TPV2_MSG_TYPE_DATA_L_S_O 0x4A02
/**
* L2TPv2 Common Header
*/
struct rte_l2tpv2_common_hdr {
union {
/** header flags and protocol version */
rte_be16_t flags_version;
__extension__
struct {
#if RTE_BYTE_ORDER == RTE_LITTLE_ENDIAN
uint16_t ver:4; /**< protocol version */
uint16_t res3:4; /**< reserved */
uint16_t p:1; /**< priority option bit */
uint16_t o:1; /**< offset option bit */
uint16_t res2:1; /**< reserved */
uint16_t s:1; /**< ns/nr option bit */
uint16_t res1:2; /**< reserved */
uint16_t l:1; /**< length option bit */
uint16_t t:1; /**< message Type */
#elif RTE_BYTE_ORDER == RTE_BIG_ENDIAN
uint16_t t:1; /**< message Type */
uint16_t l:1; /**< length option bit */
uint16_t res1:2; /**< reserved */
uint16_t s:1; /**< ns/nr option bit */
uint16_t res2:1; /**< reserved */
uint16_t o:1; /**< offset option bit */
uint16_t p:1; /**< priority option bit */
uint16_t res3:4; /**< reserved */
uint16_t ver:4; /**< protocol version */
#endif
};
};
};
/**
* L2TPv2 message Header contains all options(length, ns, nr,
* offset size, offset padding).
*/
struct rte_l2tpv2_msg_with_all_options {
rte_be16_t length; /**< length(16) */
rte_be16_t tunnel_id; /**< tunnel ID(16) */
rte_be16_t session_id; /**< session ID(16) */
rte_be16_t ns; /**< Ns(16) */
rte_be16_t nr; /**< Nr(16) */
rte_be16_t offset_size; /**< offset size(16) */
uint8_t *offset_padding; /**< offset padding(variable length) */
} __rte_packed;
/**
* L2TPv2 message Header contains all options except length(ns, nr,
* offset size, offset padding).
*/
struct rte_l2tpv2_msg_without_length {
rte_be16_t tunnel_id; /**< tunnel ID(16) */
rte_be16_t session_id; /**< session ID(16) */
rte_be16_t ns; /**< Ns(16) */
rte_be16_t nr; /**< Nr(16) */
rte_be16_t offset_size; /**< offset size(16) */
uint8_t *offset_padding; /**< offset padding(variable length) */
} __rte_packed;
/**
* L2TPv2 message Header contains all options except ns_nr(length,
* offset size, offset padding).
* Ns and Nr MUST be together.
*/
struct rte_l2tpv2_msg_without_ns_nr {
rte_be16_t length; /**< length(16) */
rte_be16_t tunnel_id; /**< tunnel ID(16) */
rte_be16_t session_id; /**< session ID(16) */
rte_be16_t offset_size; /**< offset size(16) */
uint8_t *offset_padding; /**< offset padding(variable length) */
};
/**
* L2TPv2 message Header contains all options except ns_nr(length, ns, nr).
* offset size and offset padding MUST be together.
*/
struct rte_l2tpv2_msg_without_offset {
rte_be16_t length; /**< length(16) */
rte_be16_t tunnel_id; /**< tunnel ID(16) */
rte_be16_t session_id; /**< session ID(16) */
rte_be16_t ns; /**< Ns(16) */
rte_be16_t nr; /**< Nr(16) */
};
/**
* L2TPv2 message Header contains options offset size and offset padding.
*/
struct rte_l2tpv2_msg_with_offset {
rte_be16_t tunnel_id; /**< tunnel ID(16) */
rte_be16_t session_id; /**< session ID(16) */
rte_be16_t offset_size; /**< offset size(16) */
uint8_t *offset_padding; /**< offset padding(variable length) */
} __rte_packed;
/**
* L2TPv2 message Header contains options ns and nr.
*/
struct rte_l2tpv2_msg_with_ns_nr {
rte_be16_t tunnel_id; /**< tunnel ID(16) */
rte_be16_t session_id; /**< session ID(16) */
rte_be16_t ns; /**< Ns(16) */
rte_be16_t nr; /**< Nr(16) */
};
/**
* L2TPv2 message Header contains option length.
*/
struct rte_l2tpv2_msg_with_length {
rte_be16_t length; /**< length(16) */
rte_be16_t tunnel_id; /**< tunnel ID(16) */
rte_be16_t session_id; /**< session ID(16) */
};
/**
* L2TPv2 message Header without all options.
*/
struct rte_l2tpv2_msg_without_all_options {
rte_be16_t tunnel_id; /**< tunnel ID(16) */
rte_be16_t session_id; /**< session ID(16) */
};
/**
* L2TPv2 Combined Message Header Format: Common Header + Options
*/
struct rte_l2tpv2_combined_msg_hdr {
struct rte_l2tpv2_common_hdr common; /**< common header */
union {
/** header with all options */
struct rte_l2tpv2_msg_with_all_options type0;
/** header with all options except length */
struct rte_l2tpv2_msg_without_length type1;
/** header with all options except ns/nr */
struct rte_l2tpv2_msg_without_ns_nr type2;
/** header with all options except offset */
struct rte_l2tpv2_msg_without_offset type3;
/** header with offset options */
struct rte_l2tpv2_msg_with_offset type4;
/** header with ns/nr options */
struct rte_l2tpv2_msg_with_ns_nr type5;
/** header with length option */
struct rte_l2tpv2_msg_with_length type6;
/** header without all options */
struct rte_l2tpv2_msg_without_all_options type7;
};
} __rte_packed;
#ifdef __cplusplus
}
#endif
#endif /* _RTE_L2TPV2_H_ */
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