1 /* SPDX-License-Identifier: BSD-3-Clause
2 * Copyright(c) 2021 Intel Corporation.
13 * `-0--------------------1----------------2-------------------3`
15 * `-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`
17 * `+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+`
19 * `|T|L|x|x|S|x|O|P|x|x|x|x|--Ver--|-----------Length (opt)--------|`
21 * `+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+`
23 * `|-----------Tunnel ID-----------|-----------Session ID----------|`
25 * `+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+`
27 * `|-----------Ns (opt)------------|-----------Nr (opt)------------|`
29 * `+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+`
31 * `|---------Offset Size (opt)-----|---------Offset pad... (opt)`
33 * `+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+`
35 * The Type (T) bit indicates the type of message. It is set to 0 for a data
36 * message and 1 for a control message.
38 * If the Length (L) bit is 1, the Length field is present. This bit MUST be
39 * set to 1 for control messages.
41 * The x bits are reserved for future extensions. All reserved bits MUST
42 * be set to 0 on outgoing messages and ignored on incoming messages.
44 * If the Sequence (S) bit is set to 1 the Ns and Nr fields are present.
45 * The S bit MUST be set to 1 for control messages.
47 * If the Offset (O) bit is 1, the Offset Size field is present. The O
48 * bit MUST be set to 0 for control messages.
50 * If the Priority (P) bit is 1, this data message should receive
51 * preferential treatment in its local queuing and transmission.
52 * The P bit MUST be set to 0 for control messages.
54 * Ver MUST be 2, indicating the version of the L2TP data message header.
56 * The Length field indicates the total length of the message in octets.
58 * Tunnel ID indicates the identifier for the control connection.
60 * Session ID indicates the identifier for a session within a tunnel.
62 * Ns indicates the sequence number for this data or control message.
64 * Nr indicates the sequence number expected in the next control message
67 * The Offset Size field, if present, specifies the number of octets
68 * past the L2TP header at which the payload data is expected to start.
69 * Actual data within the offset padding is undefined. If the offset
70 * field is present, the L2TP header ends after the last octet of the
75 #include <rte_byteorder.h>
82 * L2TPv2 Common Header
85 struct rte_l2tpv2_common_hdr {
87 /** header flags and protocol version */
88 rte_be16_t flags_version;
90 #if RTE_BYTE_ORDER == RTE_LITTLE_ENDIAN
91 rte_be16_t t:1; /**< message Type */
92 rte_be16_t l:1; /**< length option bit */
93 rte_be16_t res1:2; /**< reserved */
94 rte_be16_t s:1; /**< ns/nr option bit */
95 rte_be16_t res2:1; /**< reserved */
96 rte_be16_t o:1; /**< offset option bit */
97 rte_be16_t p:1; /**< priority option bit */
98 rte_be16_t res3:4; /**< reserved */
99 rte_be16_t ver:4; /**< protocol version */
100 #elif RTE_BYTE_ORDER == RTE_BIG_ENDIAN
101 rte_be16_t ver:4; /**< protocol version */
102 rte_be16_t res3:4; /**< reserved */
103 rte_be16_t p:1; /**< priority option bit */
104 rte_be16_t o:1; /**< offset option bit */
105 rte_be16_t res2:1; /**< reserved */
106 rte_be16_t s:1; /**< ns/nr option bit */
107 rte_be16_t res1:2; /**< reserved */
108 rte_be16_t l:1; /**< length option bit */
109 rte_be16_t t:1; /**< message Type */
116 * L2TPv2 message Header contains all options(length, ns, nr,
117 * offset size, offset padding).
119 struct rte_l2tpv2_msg_with_all_options {
120 rte_be16_t length; /**< length(16) */
121 rte_be16_t tunnel_id; /**< tunnel ID(16) */
122 rte_be16_t session_id; /**< session ID(16) */
123 rte_be16_t ns; /**< Ns(16) */
124 rte_be16_t nr; /**< Nr(16) */
125 rte_be16_t offset_size; /**< offset size(16) */
126 uint8_t *offset_padding; /**< offset padding(variable length) */
130 * L2TPv2 message Header contains all options except length(ns, nr,
131 * offset size, offset padding).
133 struct rte_l2tpv2_msg_without_length {
134 rte_be16_t tunnel_id; /**< tunnel ID(16) */
135 rte_be16_t session_id; /**< session ID(16) */
136 rte_be16_t ns; /**< Ns(16) */
137 rte_be16_t nr; /**< Nr(16) */
138 rte_be16_t offset_size; /**< offset size(16) */
139 uint8_t *offset_padding; /**< offset padding(variable length) */
143 * L2TPv2 message Header contains all options except ns_nr(length,
144 * offset size, offset padding).
145 * Ns and Nr MUST be toghter.
147 struct rte_l2tpv2_msg_without_ns_nr {
148 rte_be16_t length; /**< length(16) */
149 rte_be16_t tunnel_id; /**< tunnel ID(16) */
150 rte_be16_t session_id; /**< session ID(16) */
151 rte_be16_t offset_size; /**< offset size(16) */
152 uint8_t *offset_padding; /**< offset padding(variable length) */
156 * L2TPv2 message Header contains all options except ns_nr(length, ns, nr).
157 * offset size and offset padding MUST be toghter.
159 struct rte_l2tpv2_msg_without_offset {
160 rte_be16_t length; /**< length(16) */
161 rte_be16_t tunnel_id; /**< tunnel ID(16) */
162 rte_be16_t session_id; /**< session ID(16) */
163 rte_be16_t ns; /**< Ns(16) */
164 rte_be16_t nr; /**< Nr(16) */
168 * L2TPv2 message Header contains options offset size and offset padding.
170 struct rte_l2tpv2_msg_with_offset {
171 rte_be16_t tunnel_id; /**< tunnel ID(16) */
172 rte_be16_t session_id; /**< session ID(16) */
173 rte_be16_t offset_size; /**< offset size(16) */
174 uint8_t *offset_padding; /**< offset padding(variable length) */
178 * L2TPv2 message Header contains options ns and nr.
180 struct rte_l2tpv2_msg_with_ns_nr {
181 rte_be16_t tunnel_id; /**< tunnel ID(16) */
182 rte_be16_t session_id; /**< session ID(16) */
183 rte_be16_t ns; /**< Ns(16) */
184 rte_be16_t nr; /**< Nr(16) */
188 * L2TPv2 message Header contains option length.
190 struct rte_l2tpv2_msg_with_length {
191 rte_be16_t length; /**< length(16) */
192 rte_be16_t tunnel_id; /**< tunnel ID(16) */
193 rte_be16_t session_id; /**< session ID(16) */
197 * L2TPv2 message Header without all options.
199 struct rte_l2tpv2_msg_without_all_options {
200 rte_be16_t tunnel_id; /**< tunnel ID(16) */
201 rte_be16_t session_id; /**< session ID(16) */
205 * L2TPv2 Combined Message Header Format: Common Header + Options
208 struct rte_l2tpv2_combined_msg_hdr {
209 struct rte_l2tpv2_common_hdr common; /**< common header */
211 /** header with all options */
212 struct rte_l2tpv2_msg_with_all_options type0;
213 /** header with all options except length */
214 struct rte_l2tpv2_msg_without_length type1;
215 /** header with all options except ns/nr */
216 struct rte_l2tpv2_msg_without_ns_nr type2;
217 /** header with all options except offset */
218 struct rte_l2tpv2_msg_without_offset type3;
219 /** header with offset options */
220 struct rte_l2tpv2_msg_with_offset type4;
221 /** header with ns/nr options */
222 struct rte_l2tpv2_msg_with_ns_nr type5;
223 /** header with length option */
224 struct rte_l2tpv2_msg_with_length type6;
225 /** header without all options */
226 struct rte_l2tpv2_msg_without_all_options type7;
234 #endif /* _RTE_L2TPV2_H_ */