1 #ifndef _UAPI_LINUX_DCCP_H
2 #define _UAPI_LINUX_DCCP_H
4 #include <linux/types.h>
5 #include <asm/byteorder.h>
8 * struct dccp_hdr - generic part of DCCP packet header
10 * @dccph_sport - Relevant port on the endpoint that sent this packet
11 * @dccph_dport - Relevant port on the other endpoint
12 * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words
13 * @dccph_ccval - Used by the HC-Sender CCID
14 * @dccph_cscov - Parts of the packet that are covered by the Checksum field
15 * @dccph_checksum - Internet checksum, depends on dccph_cscov
16 * @dccph_x - 0 = 24 bit sequence number, 1 = 48
17 * @dccph_type - packet type, see DCCP_PKT_ prefixed macros
18 * @dccph_seq - sequence number high or low order 24 bits, depends on dccph_x
24 #if defined(__LITTLE_ENDIAN_BITFIELD)
27 #elif defined(__BIG_ENDIAN_BITFIELD)
31 #error "Adjust your <asm/byteorder.h> defines"
33 __sum16 dccph_checksum;
34 #if defined(__LITTLE_ENDIAN_BITFIELD)
38 #elif defined(__BIG_ENDIAN_BITFIELD)
39 __u8 dccph_reserved:3,
43 #error "Adjust your <asm/byteorder.h> defines"
50 * struct dccp_hdr_ext - the low bits of a 48 bit seq packet
52 * @dccph_seq_low - low 24 bits of a 48 bit seq packet
59 * struct dccp_hdr_request - Connection initiation request header
61 * @dccph_req_service - Service to which the client app wants to connect
63 struct dccp_hdr_request {
64 __be32 dccph_req_service;
67 * struct dccp_hdr_ack_bits - acknowledgment bits common to most packets
69 * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR
70 * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR
72 struct dccp_hdr_ack_bits {
73 __be16 dccph_reserved1;
74 __be16 dccph_ack_nr_high;
75 __be32 dccph_ack_nr_low;
78 * struct dccp_hdr_response - Connection initiation response header
80 * @dccph_resp_ack - 48 bit Acknowledgment Number Subheader (5.3)
81 * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
83 struct dccp_hdr_response {
84 struct dccp_hdr_ack_bits dccph_resp_ack;
85 __be32 dccph_resp_service;
89 * struct dccp_hdr_reset - Unconditionally shut down a connection
91 * @dccph_reset_ack - 48 bit Acknowledgment Number Subheader (5.6)
92 * @dccph_reset_code - one of %dccp_reset_codes
93 * @dccph_reset_data - the Data 1 ... Data 3 fields from 5.6
95 struct dccp_hdr_reset {
96 struct dccp_hdr_ack_bits dccph_reset_ack;
97 __u8 dccph_reset_code,
102 DCCP_PKT_REQUEST = 0,
115 #define DCCP_NR_PKT_TYPES DCCP_PKT_INVALID
117 static inline unsigned int dccp_packet_hdr_len(const __u8 type)
119 if (type == DCCP_PKT_DATA)
121 if (type == DCCP_PKT_DATAACK ||
122 type == DCCP_PKT_ACK ||
123 type == DCCP_PKT_SYNC ||
124 type == DCCP_PKT_SYNCACK ||
125 type == DCCP_PKT_CLOSE ||
126 type == DCCP_PKT_CLOSEREQ)
127 return sizeof(struct dccp_hdr_ack_bits);
128 if (type == DCCP_PKT_REQUEST)
129 return sizeof(struct dccp_hdr_request);
130 if (type == DCCP_PKT_RESPONSE)
131 return sizeof(struct dccp_hdr_response);
132 return sizeof(struct dccp_hdr_reset);
134 enum dccp_reset_codes {
135 DCCP_RESET_CODE_UNSPECIFIED = 0,
136 DCCP_RESET_CODE_CLOSED,
137 DCCP_RESET_CODE_ABORTED,
138 DCCP_RESET_CODE_NO_CONNECTION,
139 DCCP_RESET_CODE_PACKET_ERROR,
140 DCCP_RESET_CODE_OPTION_ERROR,
141 DCCP_RESET_CODE_MANDATORY_ERROR,
142 DCCP_RESET_CODE_CONNECTION_REFUSED,
143 DCCP_RESET_CODE_BAD_SERVICE_CODE,
144 DCCP_RESET_CODE_TOO_BUSY,
145 DCCP_RESET_CODE_BAD_INIT_COOKIE,
146 DCCP_RESET_CODE_AGGRESSION_PENALTY,
148 DCCP_MAX_RESET_CODES /* Leave at the end! */
155 DCCPO_MIN_RESERVED = 3,
156 DCCPO_MAX_RESERVED = 31,
158 DCCPO_CONFIRM_L = 33,
160 DCCPO_CONFIRM_R = 35,
161 DCCPO_NDP_COUNT = 37,
162 DCCPO_ACK_VECTOR_0 = 38,
163 DCCPO_ACK_VECTOR_1 = 39,
164 DCCPO_TIMESTAMP = 41,
165 DCCPO_TIMESTAMP_ECHO = 42,
166 DCCPO_ELAPSED_TIME = 43,
168 DCCPO_MIN_RX_CCID_SPECIFIC = 128, /* from sender to receiver */
169 DCCPO_MAX_RX_CCID_SPECIFIC = 191,
170 DCCPO_MIN_TX_CCID_SPECIFIC = 192, /* from receiver to sender */
171 DCCPO_MAX_TX_CCID_SPECIFIC = 255,
173 /* maximum size of a single TLV-encoded DCCP option (sans type/len bytes) */
174 #define DCCP_SINGLE_OPT_MAXLEN 253
182 /* DCCP features (RFC 4340 section 6.4) */
183 enum dccp_feature_numbers {
186 DCCPF_SHORT_SEQNOS = 2,
187 DCCPF_SEQUENCE_WINDOW = 3,
188 DCCPF_ECN_INCAPABLE = 4,
190 DCCPF_SEND_ACK_VECTOR = 6,
191 DCCPF_SEND_NDP_COUNT = 7,
192 DCCPF_MIN_CSUM_COVER = 8,
193 DCCPF_DATA_CHECKSUM = 9,
194 /* 10-127 reserved */
195 DCCPF_MIN_CCID_SPECIFIC = 128,
196 DCCPF_SEND_LEV_RATE = 192, /* RFC 4342, sec. 8.4 */
197 DCCPF_MAX_CCID_SPECIFIC = 255,
200 /* DCCP socket control message types for cmsg */
201 enum dccp_cmsg_type {
202 DCCP_SCM_PRIORITY = 1,
203 DCCP_SCM_QPOLICY_MAX = 0xFFFF,
204 /* ^-- Up to here reserved exclusively for qpolicy parameters */
208 /* DCCP priorities for outgoing/queued packets */
209 enum dccp_packet_dequeueing_policy {
215 /* DCCP socket options */
216 #define DCCP_SOCKOPT_PACKET_SIZE 1 /* XXX deprecated, without effect */
217 #define DCCP_SOCKOPT_SERVICE 2
218 #define DCCP_SOCKOPT_CHANGE_L 3
219 #define DCCP_SOCKOPT_CHANGE_R 4
220 #define DCCP_SOCKOPT_GET_CUR_MPS 5
221 #define DCCP_SOCKOPT_SERVER_TIMEWAIT 6
222 #define DCCP_SOCKOPT_SEND_CSCOV 10
223 #define DCCP_SOCKOPT_RECV_CSCOV 11
224 #define DCCP_SOCKOPT_AVAILABLE_CCIDS 12
225 #define DCCP_SOCKOPT_CCID 13
226 #define DCCP_SOCKOPT_TX_CCID 14
227 #define DCCP_SOCKOPT_RX_CCID 15
228 #define DCCP_SOCKOPT_QPOLICY_ID 16
229 #define DCCP_SOCKOPT_QPOLICY_TXQLEN 17
230 #define DCCP_SOCKOPT_CCID_RX_INFO 128
231 #define DCCP_SOCKOPT_CCID_TX_INFO 192
233 /* maximum number of services provided on the same listening port */
234 #define DCCP_SERVICE_LIST_MAX_LEN 32
237 #endif /* _UAPI_LINUX_DCCP_H */