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6f52b16c | 1 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
607ca46e DH |
2 | #ifndef _UAPI_LINUX_DCCP_H |
3 | #define _UAPI_LINUX_DCCP_H | |
4 | ||
5 | #include <linux/types.h> | |
6 | #include <asm/byteorder.h> | |
7 | ||
8 | /** | |
9 | * struct dccp_hdr - generic part of DCCP packet header | |
10 | * | |
11 | * @dccph_sport - Relevant port on the endpoint that sent this packet | |
12 | * @dccph_dport - Relevant port on the other endpoint | |
13 | * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words | |
14 | * @dccph_ccval - Used by the HC-Sender CCID | |
15 | * @dccph_cscov - Parts of the packet that are covered by the Checksum field | |
16 | * @dccph_checksum - Internet checksum, depends on dccph_cscov | |
17 | * @dccph_x - 0 = 24 bit sequence number, 1 = 48 | |
18 | * @dccph_type - packet type, see DCCP_PKT_ prefixed macros | |
19 | * @dccph_seq - sequence number high or low order 24 bits, depends on dccph_x | |
20 | */ | |
21 | struct dccp_hdr { | |
22 | __be16 dccph_sport, | |
23 | dccph_dport; | |
24 | __u8 dccph_doff; | |
25 | #if defined(__LITTLE_ENDIAN_BITFIELD) | |
26 | __u8 dccph_cscov:4, | |
27 | dccph_ccval:4; | |
28 | #elif defined(__BIG_ENDIAN_BITFIELD) | |
29 | __u8 dccph_ccval:4, | |
30 | dccph_cscov:4; | |
31 | #else | |
32 | #error "Adjust your <asm/byteorder.h> defines" | |
33 | #endif | |
34 | __sum16 dccph_checksum; | |
35 | #if defined(__LITTLE_ENDIAN_BITFIELD) | |
36 | __u8 dccph_x:1, | |
37 | dccph_type:4, | |
38 | dccph_reserved:3; | |
39 | #elif defined(__BIG_ENDIAN_BITFIELD) | |
40 | __u8 dccph_reserved:3, | |
41 | dccph_type:4, | |
42 | dccph_x:1; | |
43 | #else | |
44 | #error "Adjust your <asm/byteorder.h> defines" | |
45 | #endif | |
46 | __u8 dccph_seq2; | |
47 | __be16 dccph_seq; | |
48 | }; | |
49 | ||
50 | /** | |
51 | * struct dccp_hdr_ext - the low bits of a 48 bit seq packet | |
52 | * | |
53 | * @dccph_seq_low - low 24 bits of a 48 bit seq packet | |
54 | */ | |
55 | struct dccp_hdr_ext { | |
56 | __be32 dccph_seq_low; | |
57 | }; | |
58 | ||
59 | /** | |
60 | * struct dccp_hdr_request - Connection initiation request header | |
61 | * | |
62 | * @dccph_req_service - Service to which the client app wants to connect | |
63 | */ | |
64 | struct dccp_hdr_request { | |
65 | __be32 dccph_req_service; | |
66 | }; | |
67 | /** | |
68 | * struct dccp_hdr_ack_bits - acknowledgment bits common to most packets | |
69 | * | |
70 | * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR | |
71 | * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR | |
72 | */ | |
73 | struct dccp_hdr_ack_bits { | |
74 | __be16 dccph_reserved1; | |
75 | __be16 dccph_ack_nr_high; | |
76 | __be32 dccph_ack_nr_low; | |
77 | }; | |
78 | /** | |
79 | * struct dccp_hdr_response - Connection initiation response header | |
80 | * | |
81 | * @dccph_resp_ack - 48 bit Acknowledgment Number Subheader (5.3) | |
82 | * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request | |
83 | */ | |
84 | struct dccp_hdr_response { | |
85 | struct dccp_hdr_ack_bits dccph_resp_ack; | |
86 | __be32 dccph_resp_service; | |
87 | }; | |
88 | ||
89 | /** | |
90 | * struct dccp_hdr_reset - Unconditionally shut down a connection | |
91 | * | |
92 | * @dccph_reset_ack - 48 bit Acknowledgment Number Subheader (5.6) | |
93 | * @dccph_reset_code - one of %dccp_reset_codes | |
94 | * @dccph_reset_data - the Data 1 ... Data 3 fields from 5.6 | |
95 | */ | |
96 | struct dccp_hdr_reset { | |
97 | struct dccp_hdr_ack_bits dccph_reset_ack; | |
98 | __u8 dccph_reset_code, | |
99 | dccph_reset_data[3]; | |
100 | }; | |
101 | ||
102 | enum dccp_pkt_type { | |
103 | DCCP_PKT_REQUEST = 0, | |
104 | DCCP_PKT_RESPONSE, | |
105 | DCCP_PKT_DATA, | |
106 | DCCP_PKT_ACK, | |
107 | DCCP_PKT_DATAACK, | |
108 | DCCP_PKT_CLOSEREQ, | |
109 | DCCP_PKT_CLOSE, | |
110 | DCCP_PKT_RESET, | |
111 | DCCP_PKT_SYNC, | |
112 | DCCP_PKT_SYNCACK, | |
113 | DCCP_PKT_INVALID, | |
114 | }; | |
115 | ||
116 | #define DCCP_NR_PKT_TYPES DCCP_PKT_INVALID | |
117 | ||
118 | static inline unsigned int dccp_packet_hdr_len(const __u8 type) | |
119 | { | |
120 | if (type == DCCP_PKT_DATA) | |
121 | return 0; | |
122 | if (type == DCCP_PKT_DATAACK || | |
123 | type == DCCP_PKT_ACK || | |
124 | type == DCCP_PKT_SYNC || | |
125 | type == DCCP_PKT_SYNCACK || | |
126 | type == DCCP_PKT_CLOSE || | |
127 | type == DCCP_PKT_CLOSEREQ) | |
128 | return sizeof(struct dccp_hdr_ack_bits); | |
129 | if (type == DCCP_PKT_REQUEST) | |
130 | return sizeof(struct dccp_hdr_request); | |
131 | if (type == DCCP_PKT_RESPONSE) | |
132 | return sizeof(struct dccp_hdr_response); | |
133 | return sizeof(struct dccp_hdr_reset); | |
134 | } | |
135 | enum dccp_reset_codes { | |
136 | DCCP_RESET_CODE_UNSPECIFIED = 0, | |
137 | DCCP_RESET_CODE_CLOSED, | |
138 | DCCP_RESET_CODE_ABORTED, | |
139 | DCCP_RESET_CODE_NO_CONNECTION, | |
140 | DCCP_RESET_CODE_PACKET_ERROR, | |
141 | DCCP_RESET_CODE_OPTION_ERROR, | |
142 | DCCP_RESET_CODE_MANDATORY_ERROR, | |
143 | DCCP_RESET_CODE_CONNECTION_REFUSED, | |
144 | DCCP_RESET_CODE_BAD_SERVICE_CODE, | |
145 | DCCP_RESET_CODE_TOO_BUSY, | |
146 | DCCP_RESET_CODE_BAD_INIT_COOKIE, | |
147 | DCCP_RESET_CODE_AGGRESSION_PENALTY, | |
148 | ||
149 | DCCP_MAX_RESET_CODES /* Leave at the end! */ | |
150 | }; | |
151 | ||
152 | /* DCCP options */ | |
153 | enum { | |
154 | DCCPO_PADDING = 0, | |
155 | DCCPO_MANDATORY = 1, | |
156 | DCCPO_MIN_RESERVED = 3, | |
157 | DCCPO_MAX_RESERVED = 31, | |
158 | DCCPO_CHANGE_L = 32, | |
159 | DCCPO_CONFIRM_L = 33, | |
160 | DCCPO_CHANGE_R = 34, | |
161 | DCCPO_CONFIRM_R = 35, | |
162 | DCCPO_NDP_COUNT = 37, | |
163 | DCCPO_ACK_VECTOR_0 = 38, | |
164 | DCCPO_ACK_VECTOR_1 = 39, | |
165 | DCCPO_TIMESTAMP = 41, | |
166 | DCCPO_TIMESTAMP_ECHO = 42, | |
167 | DCCPO_ELAPSED_TIME = 43, | |
168 | DCCPO_MAX = 45, | |
169 | DCCPO_MIN_RX_CCID_SPECIFIC = 128, /* from sender to receiver */ | |
170 | DCCPO_MAX_RX_CCID_SPECIFIC = 191, | |
171 | DCCPO_MIN_TX_CCID_SPECIFIC = 192, /* from receiver to sender */ | |
172 | DCCPO_MAX_TX_CCID_SPECIFIC = 255, | |
173 | }; | |
174 | /* maximum size of a single TLV-encoded DCCP option (sans type/len bytes) */ | |
175 | #define DCCP_SINGLE_OPT_MAXLEN 253 | |
176 | ||
177 | /* DCCP CCIDS */ | |
178 | enum { | |
179 | DCCPC_CCID2 = 2, | |
180 | DCCPC_CCID3 = 3, | |
181 | }; | |
182 | ||
183 | /* DCCP features (RFC 4340 section 6.4) */ | |
184 | enum dccp_feature_numbers { | |
185 | DCCPF_RESERVED = 0, | |
186 | DCCPF_CCID = 1, | |
187 | DCCPF_SHORT_SEQNOS = 2, | |
188 | DCCPF_SEQUENCE_WINDOW = 3, | |
189 | DCCPF_ECN_INCAPABLE = 4, | |
190 | DCCPF_ACK_RATIO = 5, | |
191 | DCCPF_SEND_ACK_VECTOR = 6, | |
192 | DCCPF_SEND_NDP_COUNT = 7, | |
193 | DCCPF_MIN_CSUM_COVER = 8, | |
194 | DCCPF_DATA_CHECKSUM = 9, | |
195 | /* 10-127 reserved */ | |
196 | DCCPF_MIN_CCID_SPECIFIC = 128, | |
197 | DCCPF_SEND_LEV_RATE = 192, /* RFC 4342, sec. 8.4 */ | |
198 | DCCPF_MAX_CCID_SPECIFIC = 255, | |
199 | }; | |
200 | ||
201 | /* DCCP socket control message types for cmsg */ | |
202 | enum dccp_cmsg_type { | |
203 | DCCP_SCM_PRIORITY = 1, | |
204 | DCCP_SCM_QPOLICY_MAX = 0xFFFF, | |
205 | /* ^-- Up to here reserved exclusively for qpolicy parameters */ | |
206 | DCCP_SCM_MAX | |
207 | }; | |
208 | ||
209 | /* DCCP priorities for outgoing/queued packets */ | |
210 | enum dccp_packet_dequeueing_policy { | |
211 | DCCPQ_POLICY_SIMPLE, | |
212 | DCCPQ_POLICY_PRIO, | |
213 | DCCPQ_POLICY_MAX | |
214 | }; | |
215 | ||
216 | /* DCCP socket options */ | |
217 | #define DCCP_SOCKOPT_PACKET_SIZE 1 /* XXX deprecated, without effect */ | |
218 | #define DCCP_SOCKOPT_SERVICE 2 | |
219 | #define DCCP_SOCKOPT_CHANGE_L 3 | |
220 | #define DCCP_SOCKOPT_CHANGE_R 4 | |
221 | #define DCCP_SOCKOPT_GET_CUR_MPS 5 | |
222 | #define DCCP_SOCKOPT_SERVER_TIMEWAIT 6 | |
223 | #define DCCP_SOCKOPT_SEND_CSCOV 10 | |
224 | #define DCCP_SOCKOPT_RECV_CSCOV 11 | |
225 | #define DCCP_SOCKOPT_AVAILABLE_CCIDS 12 | |
226 | #define DCCP_SOCKOPT_CCID 13 | |
227 | #define DCCP_SOCKOPT_TX_CCID 14 | |
228 | #define DCCP_SOCKOPT_RX_CCID 15 | |
229 | #define DCCP_SOCKOPT_QPOLICY_ID 16 | |
230 | #define DCCP_SOCKOPT_QPOLICY_TXQLEN 17 | |
231 | #define DCCP_SOCKOPT_CCID_RX_INFO 128 | |
232 | #define DCCP_SOCKOPT_CCID_TX_INFO 192 | |
233 | ||
234 | /* maximum number of services provided on the same listening port */ | |
235 | #define DCCP_SERVICE_LIST_MAX_LEN 32 | |
236 | ||
237 | ||
238 | #endif /* _UAPI_LINUX_DCCP_H */ |