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7c657876 ACM |
1 | #ifndef _LINUX_DCCP_H |
2 | #define _LINUX_DCCP_H | |
3 | ||
7c657876 | 4 | #include <linux/types.h> |
5a47a470 | 5 | #include <asm/byteorder.h> |
7c657876 | 6 | |
7c657876 ACM |
7 | /** |
8 | * struct dccp_hdr - generic part of DCCP packet header | |
9 | * | |
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 | |
19 | */ | |
20 | struct dccp_hdr { | |
60fe62e7 | 21 | __be16 dccph_sport, |
7c657876 ACM |
22 | dccph_dport; |
23 | __u8 dccph_doff; | |
24 | #if defined(__LITTLE_ENDIAN_BITFIELD) | |
25 | __u8 dccph_cscov:4, | |
26 | dccph_ccval:4; | |
27 | #elif defined(__BIG_ENDIAN_BITFIELD) | |
28 | __u8 dccph_ccval:4, | |
29 | dccph_cscov:4; | |
30 | #else | |
31 | #error "Adjust your <asm/byteorder.h> defines" | |
32 | #endif | |
9981a0e3 | 33 | __sum16 dccph_checksum; |
7c657876 | 34 | #if defined(__LITTLE_ENDIAN_BITFIELD) |
60fe62e7 | 35 | __u8 dccph_x:1, |
7c657876 | 36 | dccph_type:4, |
60fe62e7 | 37 | dccph_reserved:3; |
7c657876 | 38 | #elif defined(__BIG_ENDIAN_BITFIELD) |
60fe62e7 | 39 | __u8 dccph_reserved:3, |
7c657876 | 40 | dccph_type:4, |
60fe62e7 | 41 | dccph_x:1; |
7c657876 ACM |
42 | #else |
43 | #error "Adjust your <asm/byteorder.h> defines" | |
44 | #endif | |
60fe62e7 AB |
45 | __u8 dccph_seq2; |
46 | __be16 dccph_seq; | |
7c657876 ACM |
47 | }; |
48 | ||
7c657876 ACM |
49 | /** |
50 | * struct dccp_hdr_ext - the low bits of a 48 bit seq packet | |
51 | * | |
52 | * @dccph_seq_low - low 24 bits of a 48 bit seq packet | |
53 | */ | |
54 | struct dccp_hdr_ext { | |
60fe62e7 | 55 | __be32 dccph_seq_low; |
7c657876 ACM |
56 | }; |
57 | ||
7c657876 | 58 | /** |
0430ee34 | 59 | * struct dccp_hdr_request - Connection initiation request header |
7c657876 ACM |
60 | * |
61 | * @dccph_req_service - Service to which the client app wants to connect | |
7c657876 ACM |
62 | */ |
63 | struct dccp_hdr_request { | |
60fe62e7 | 64 | __be32 dccph_req_service; |
7c657876 | 65 | }; |
7c657876 ACM |
66 | /** |
67 | * struct dccp_hdr_ack_bits - acknowledgment bits common to most packets | |
68 | * | |
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 | |
71 | */ | |
72 | struct dccp_hdr_ack_bits { | |
60fe62e7 AB |
73 | __be16 dccph_reserved1; |
74 | __be16 dccph_ack_nr_high; | |
75 | __be32 dccph_ack_nr_low; | |
7c657876 | 76 | }; |
7c657876 | 77 | /** |
0430ee34 | 78 | * struct dccp_hdr_response - Connection initiation response header |
7c657876 | 79 | * |
0430ee34 | 80 | * @dccph_resp_ack - 48 bit Acknowledgment Number Subheader (5.3) |
7c657876 | 81 | * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request |
7c657876 ACM |
82 | */ |
83 | struct dccp_hdr_response { | |
84 | struct dccp_hdr_ack_bits dccph_resp_ack; | |
60fe62e7 | 85 | __be32 dccph_resp_service; |
7c657876 ACM |
86 | }; |
87 | ||
7c657876 ACM |
88 | /** |
89 | * struct dccp_hdr_reset - Unconditionally shut down a connection | |
90 | * | |
0430ee34 GR |
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 | |
7c657876 ACM |
94 | */ |
95 | struct dccp_hdr_reset { | |
96 | struct dccp_hdr_ack_bits dccph_reset_ack; | |
97 | __u8 dccph_reset_code, | |
98 | dccph_reset_data[3]; | |
99 | }; | |
100 | ||
7c657876 ACM |
101 | enum dccp_pkt_type { |
102 | DCCP_PKT_REQUEST = 0, | |
103 | DCCP_PKT_RESPONSE, | |
104 | DCCP_PKT_DATA, | |
105 | DCCP_PKT_ACK, | |
106 | DCCP_PKT_DATAACK, | |
107 | DCCP_PKT_CLOSEREQ, | |
108 | DCCP_PKT_CLOSE, | |
109 | DCCP_PKT_RESET, | |
110 | DCCP_PKT_SYNC, | |
111 | DCCP_PKT_SYNCACK, | |
112 | DCCP_PKT_INVALID, | |
113 | }; | |
114 | ||
115 | #define DCCP_NR_PKT_TYPES DCCP_PKT_INVALID | |
116 | ||
117 | static inline unsigned int dccp_packet_hdr_len(const __u8 type) | |
118 | { | |
119 | if (type == DCCP_PKT_DATA) | |
120 | return 0; | |
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); | |
133 | } | |
7c657876 ACM |
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, | |
d8ef2c29 GR |
147 | |
148 | DCCP_MAX_RESET_CODES /* Leave at the end! */ | |
7c657876 ACM |
149 | }; |
150 | ||
151 | /* DCCP options */ | |
152 | enum { | |
153 | DCCPO_PADDING = 0, | |
154 | DCCPO_MANDATORY = 1, | |
155 | DCCPO_MIN_RESERVED = 3, | |
156 | DCCPO_MAX_RESERVED = 31, | |
afe00251 AB |
157 | DCCPO_CHANGE_L = 32, |
158 | DCCPO_CONFIRM_L = 33, | |
159 | DCCPO_CHANGE_R = 34, | |
160 | DCCPO_CONFIRM_R = 35, | |
7c657876 ACM |
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, | |
167 | DCCPO_MAX = 45, | |
a18213d1 GR |
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, | |
7c657876 | 172 | }; |
b20a9c24 GR |
173 | /* maximum size of a single TLV-encoded DCCP option (sans type/len bytes) */ |
174 | #define DCCP_SINGLE_OPT_MAXLEN 253 | |
7c657876 | 175 | |
b83eff64 IM |
176 | /* DCCP CCIDS */ |
177 | enum { | |
178 | DCCPC_CCID2 = 2, | |
179 | DCCPC_CCID3 = 3, | |
180 | }; | |
181 | ||
c02fdc0e | 182 | /* DCCP features (RFC 4340 section 6.4) */ |
7d43d1a0 | 183 | enum dccp_feature_numbers { |
8109b02b ACM |
184 | DCCPF_RESERVED = 0, |
185 | DCCPF_CCID = 1, | |
7d43d1a0 | 186 | DCCPF_SHORT_SEQNOS = 2, |
8109b02b | 187 | DCCPF_SEQUENCE_WINDOW = 3, |
7d43d1a0 | 188 | DCCPF_ECN_INCAPABLE = 4, |
8109b02b ACM |
189 | DCCPF_ACK_RATIO = 5, |
190 | DCCPF_SEND_ACK_VECTOR = 6, | |
191 | DCCPF_SEND_NDP_COUNT = 7, | |
6f4e5fff | 192 | DCCPF_MIN_CSUM_COVER = 8, |
7d43d1a0 | 193 | DCCPF_DATA_CHECKSUM = 9, |
8109b02b ACM |
194 | /* 10-127 reserved */ |
195 | DCCPF_MIN_CCID_SPECIFIC = 128, | |
7d43d1a0 | 196 | DCCPF_SEND_LEV_RATE = 192, /* RFC 4342, sec. 8.4 */ |
8109b02b | 197 | DCCPF_MAX_CCID_SPECIFIC = 255, |
7c657876 ACM |
198 | }; |
199 | ||
871a2c16 TG |
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 */ | |
205 | DCCP_SCM_MAX | |
206 | }; | |
207 | ||
208 | /* DCCP priorities for outgoing/queued packets */ | |
209 | enum dccp_packet_dequeueing_policy { | |
210 | DCCPQ_POLICY_SIMPLE, | |
211 | DCCPQ_POLICY_PRIO, | |
212 | DCCPQ_POLICY_MAX | |
213 | }; | |
214 | ||
a84ffe43 | 215 | /* DCCP socket options */ |
5aed3243 | 216 | #define DCCP_SOCKOPT_PACKET_SIZE 1 /* XXX deprecated, without effect */ |
67e6b629 | 217 | #define DCCP_SOCKOPT_SERVICE 2 |
afe00251 AB |
218 | #define DCCP_SOCKOPT_CHANGE_L 3 |
219 | #define DCCP_SOCKOPT_CHANGE_R 4 | |
7c559a9e | 220 | #define DCCP_SOCKOPT_GET_CUR_MPS 5 |
b8599d20 | 221 | #define DCCP_SOCKOPT_SERVER_TIMEWAIT 6 |
6f4e5fff GR |
222 | #define DCCP_SOCKOPT_SEND_CSCOV 10 |
223 | #define DCCP_SOCKOPT_RECV_CSCOV 11 | |
d90ebcbf | 224 | #define DCCP_SOCKOPT_AVAILABLE_CCIDS 12 |
b20a9c24 GR |
225 | #define DCCP_SOCKOPT_CCID 13 |
226 | #define DCCP_SOCKOPT_TX_CCID 14 | |
227 | #define DCCP_SOCKOPT_RX_CCID 15 | |
871a2c16 TG |
228 | #define DCCP_SOCKOPT_QPOLICY_ID 16 |
229 | #define DCCP_SOCKOPT_QPOLICY_TXQLEN 17 | |
88f964db ACM |
230 | #define DCCP_SOCKOPT_CCID_RX_INFO 128 |
231 | #define DCCP_SOCKOPT_CCID_TX_INFO 192 | |
67e6b629 | 232 | |
09dbc389 | 233 | /* maximum number of services provided on the same listening port */ |
67e6b629 | 234 | #define DCCP_SERVICE_LIST_MAX_LEN 32 |
a84ffe43 | 235 | |
5a47a470 HW |
236 | #ifdef __KERNEL__ |
237 | ||
238 | #include <linux/in.h> | |
a6b7a407 | 239 | #include <linux/interrupt.h> |
19ac2146 | 240 | #include <linux/ktime.h> |
5a47a470 HW |
241 | #include <linux/list.h> |
242 | #include <linux/uio.h> | |
243 | #include <linux/workqueue.h> | |
244 | ||
245 | #include <net/inet_connection_sock.h> | |
14c85021 | 246 | #include <net/inet_sock.h> |
64cf1e5d | 247 | #include <net/inet_timewait_sock.h> |
5a47a470 | 248 | #include <net/tcp_states.h> |
5a47a470 HW |
249 | |
250 | enum dccp_state { | |
f11135a3 GR |
251 | DCCP_OPEN = TCP_ESTABLISHED, |
252 | DCCP_REQUESTING = TCP_SYN_SENT, | |
253 | DCCP_LISTEN = TCP_LISTEN, | |
254 | DCCP_RESPOND = TCP_SYN_RECV, | |
255 | /* | |
256 | * States involved in closing a DCCP connection: | |
257 | * 1) ACTIVE_CLOSEREQ is entered by a server sending a CloseReq. | |
258 | * | |
259 | * 2) CLOSING can have three different meanings (RFC 4340, 8.3): | |
260 | * a. Client has performed active-close, has sent a Close to the server | |
261 | * from state OPEN or PARTOPEN, and is waiting for the final Reset | |
262 | * (in this case, SOCK_DONE == 1). | |
263 | * b. Client is asked to perform passive-close, by receiving a CloseReq | |
264 | * in (PART)OPEN state. It sends a Close and waits for final Reset | |
265 | * (in this case, SOCK_DONE == 0). | |
266 | * c. Server performs an active-close as in (a), keeps TIMEWAIT state. | |
267 | * | |
268 | * 3) The following intermediate states are employed to give passively | |
269 | * closing nodes a chance to process their unread data: | |
270 | * - PASSIVE_CLOSE (from OPEN => CLOSED) and | |
271 | * - PASSIVE_CLOSEREQ (from (PART)OPEN to CLOSING; case (b) above). | |
272 | */ | |
273 | DCCP_ACTIVE_CLOSEREQ = TCP_FIN_WAIT1, | |
274 | DCCP_PASSIVE_CLOSE = TCP_CLOSE_WAIT, /* any node receiving a Close */ | |
275 | DCCP_CLOSING = TCP_CLOSING, | |
276 | DCCP_TIME_WAIT = TCP_TIME_WAIT, | |
277 | DCCP_CLOSED = TCP_CLOSE, | |
278 | DCCP_PARTOPEN = TCP_MAX_STATES, | |
279 | DCCP_PASSIVE_CLOSEREQ, /* clients receiving CloseReq */ | |
9b91ad27 | 280 | DCCP_MAX_STATES |
5a47a470 HW |
281 | }; |
282 | ||
5a47a470 | 283 | enum { |
f11135a3 GR |
284 | DCCPF_OPEN = TCPF_ESTABLISHED, |
285 | DCCPF_REQUESTING = TCPF_SYN_SENT, | |
286 | DCCPF_LISTEN = TCPF_LISTEN, | |
287 | DCCPF_RESPOND = TCPF_SYN_RECV, | |
288 | DCCPF_ACTIVE_CLOSEREQ = TCPF_FIN_WAIT1, | |
289 | DCCPF_CLOSING = TCPF_CLOSING, | |
290 | DCCPF_TIME_WAIT = TCPF_TIME_WAIT, | |
291 | DCCPF_CLOSED = TCPF_CLOSE, | |
292 | DCCPF_PARTOPEN = (1 << DCCP_PARTOPEN), | |
5a47a470 HW |
293 | }; |
294 | ||
295 | static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb) | |
296 | { | |
9c70220b | 297 | return (struct dccp_hdr *)skb_transport_header(skb); |
5a47a470 HW |
298 | } |
299 | ||
9b42078e GR |
300 | static inline struct dccp_hdr *dccp_zeroed_hdr(struct sk_buff *skb, int headlen) |
301 | { | |
badff6d0 ACM |
302 | skb_push(skb, headlen); |
303 | skb_reset_transport_header(skb); | |
9c70220b | 304 | return memset(skb_transport_header(skb), 0, headlen); |
9b42078e GR |
305 | } |
306 | ||
fde20105 | 307 | static inline struct dccp_hdr_ext *dccp_hdrx(const struct dccp_hdr *dh) |
5a47a470 | 308 | { |
fde20105 | 309 | return (struct dccp_hdr_ext *)((unsigned char *)dh + sizeof(*dh)); |
5a47a470 HW |
310 | } |
311 | ||
1d3de414 HW |
312 | static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh) |
313 | { | |
314 | return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0); | |
315 | } | |
316 | ||
5a47a470 HW |
317 | static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb) |
318 | { | |
319 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
1d3de414 | 320 | return __dccp_basic_hdr_len(dh); |
5a47a470 HW |
321 | } |
322 | ||
fde20105 | 323 | static inline __u64 dccp_hdr_seq(const struct dccp_hdr *dh) |
5a47a470 | 324 | { |
60fe62e7 | 325 | __u64 seq_nr = ntohs(dh->dccph_seq); |
5a47a470 HW |
326 | |
327 | if (dh->dccph_x != 0) | |
fde20105 | 328 | seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(dh)->dccph_seq_low); |
60fe62e7 AB |
329 | else |
330 | seq_nr += (u32)dh->dccph_seq2 << 16; | |
5a47a470 HW |
331 | |
332 | return seq_nr; | |
333 | } | |
334 | ||
335 | static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb) | |
336 | { | |
9c70220b ACM |
337 | return (struct dccp_hdr_request *)(skb_transport_header(skb) + |
338 | dccp_basic_hdr_len(skb)); | |
5a47a470 HW |
339 | } |
340 | ||
341 | static inline struct dccp_hdr_ack_bits *dccp_hdr_ack_bits(const struct sk_buff *skb) | |
342 | { | |
9c70220b ACM |
343 | return (struct dccp_hdr_ack_bits *)(skb_transport_header(skb) + |
344 | dccp_basic_hdr_len(skb)); | |
5a47a470 HW |
345 | } |
346 | ||
347 | static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb) | |
348 | { | |
349 | const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb); | |
60fe62e7 | 350 | return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) + ntohl(dhack->dccph_ack_nr_low); |
5a47a470 HW |
351 | } |
352 | ||
353 | static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb) | |
354 | { | |
9c70220b ACM |
355 | return (struct dccp_hdr_response *)(skb_transport_header(skb) + |
356 | dccp_basic_hdr_len(skb)); | |
5a47a470 HW |
357 | } |
358 | ||
359 | static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb) | |
360 | { | |
9c70220b ACM |
361 | return (struct dccp_hdr_reset *)(skb_transport_header(skb) + |
362 | dccp_basic_hdr_len(skb)); | |
5a47a470 HW |
363 | } |
364 | ||
1d3de414 HW |
365 | static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh) |
366 | { | |
367 | return __dccp_basic_hdr_len(dh) + | |
368 | dccp_packet_hdr_len(dh->dccph_type); | |
369 | } | |
370 | ||
5a47a470 HW |
371 | static inline unsigned int dccp_hdr_len(const struct sk_buff *skb) |
372 | { | |
1d3de414 | 373 | return __dccp_hdr_len(dccp_hdr(skb)); |
5a47a470 HW |
374 | } |
375 | ||
b4d4f7c7 GR |
376 | /** |
377 | * struct dccp_request_sock - represent DCCP-specific connection request | |
378 | * @dreq_inet_rsk: structure inherited from | |
f541fb7e SJ |
379 | * @dreq_iss: initial sequence number, sent on the first Response (RFC 4340, 7.1) |
380 | * @dreq_gss: greatest sequence number sent (for retransmitted Responses) | |
381 | * @dreq_isr: initial sequence number received in the first Request | |
382 | * @dreq_gsr: greatest sequence number received (for retransmitted Request(s)) | |
b4d4f7c7 | 383 | * @dreq_service: service code present on the Request (there is just one) |
ac75773c | 384 | * @dreq_featneg: feature negotiation options for this connection |
b4d4f7c7 GR |
385 | * The following two fields are analogous to the ones in dccp_sock: |
386 | * @dreq_timestamp_echo: last received timestamp to echo (13.1) | |
387 | * @dreq_timestamp_echo: the time of receiving the last @dreq_timestamp_echo | |
388 | */ | |
7c657876 ACM |
389 | struct dccp_request_sock { |
390 | struct inet_request_sock dreq_inet_rsk; | |
391 | __u64 dreq_iss; | |
f541fb7e | 392 | __u64 dreq_gss; |
7c657876 | 393 | __u64 dreq_isr; |
f541fb7e | 394 | __u64 dreq_gsr; |
60fe62e7 | 395 | __be32 dreq_service; |
ac75773c | 396 | struct list_head dreq_featneg; |
b4d4f7c7 GR |
397 | __u32 dreq_timestamp_echo; |
398 | __u32 dreq_timestamp_time; | |
7c657876 ACM |
399 | }; |
400 | ||
401 | static inline struct dccp_request_sock *dccp_rsk(const struct request_sock *req) | |
402 | { | |
403 | return (struct dccp_request_sock *)req; | |
404 | } | |
405 | ||
64cf1e5d ACM |
406 | extern struct inet_timewait_death_row dccp_death_row; |
407 | ||
8b819412 GR |
408 | extern int dccp_parse_options(struct sock *sk, struct dccp_request_sock *dreq, |
409 | struct sk_buff *skb); | |
410 | ||
7c657876 | 411 | struct dccp_options_received { |
5b5d0e70 | 412 | u64 dccpor_ndp:48; |
7c657876 ACM |
413 | u32 dccpor_timestamp; |
414 | u32 dccpor_timestamp_echo; | |
415 | u32 dccpor_elapsed_time; | |
416 | }; | |
417 | ||
418 | struct ccid; | |
419 | ||
420 | enum dccp_role { | |
421 | DCCP_ROLE_UNDEFINED, | |
422 | DCCP_ROLE_LISTEN, | |
423 | DCCP_ROLE_CLIENT, | |
424 | DCCP_ROLE_SERVER, | |
425 | }; | |
426 | ||
67e6b629 ACM |
427 | struct dccp_service_list { |
428 | __u32 dccpsl_nr; | |
60fe62e7 | 429 | __be32 dccpsl_list[0]; |
67e6b629 ACM |
430 | }; |
431 | ||
432 | #define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1) | |
8109b02b | 433 | #define DCCP_SERVICE_CODE_IS_ABSENT 0 |
67e6b629 ACM |
434 | |
435 | static inline int dccp_list_has_service(const struct dccp_service_list *sl, | |
60fe62e7 | 436 | const __be32 service) |
67e6b629 ACM |
437 | { |
438 | if (likely(sl != NULL)) { | |
439 | u32 i = sl->dccpsl_nr; | |
440 | while (i--) | |
441 | if (sl->dccpsl_list[i] == service) | |
8109b02b | 442 | return 1; |
67e6b629 ACM |
443 | } |
444 | return 0; | |
445 | } | |
446 | ||
ae31c339 ACM |
447 | struct dccp_ackvec; |
448 | ||
7c657876 ACM |
449 | /** |
450 | * struct dccp_sock - DCCP socket state | |
451 | * | |
452 | * @dccps_swl - sequence number window low | |
453 | * @dccps_swh - sequence number window high | |
454 | * @dccps_awl - acknowledgement number window low | |
455 | * @dccps_awh - acknowledgement number window high | |
456 | * @dccps_iss - initial sequence number sent | |
457 | * @dccps_isr - initial sequence number received | |
458 | * @dccps_osr - first OPEN sequence number received | |
459 | * @dccps_gss - greatest sequence number sent | |
460 | * @dccps_gsr - greatest valid sequence number received | |
461 | * @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss | |
09dbc389 GR |
462 | * @dccps_service - first (passive sock) or unique (active sock) service code |
463 | * @dccps_service_list - second .. last service code on passive socket | |
7c657876 | 464 | * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option |
b4d4f7c7 | 465 | * @dccps_timestamp_time - time of receiving latest @dccps_timestamp_echo |
91d73c15 GR |
466 | * @dccps_l_ack_ratio - feature-local Ack Ratio |
467 | * @dccps_r_ack_ratio - feature-remote Ack Ratio | |
792b4878 GR |
468 | * @dccps_l_seq_win - local Sequence Window (influences ack number validity) |
469 | * @dccps_r_seq_win - remote Sequence Window (influences seq number validity) | |
6f4e5fff GR |
470 | * @dccps_pcslen - sender partial checksum coverage (via sockopt) |
471 | * @dccps_pcrlen - receiver partial checksum coverage (via sockopt) | |
4098dce5 | 472 | * @dccps_send_ndp_count - local Send NDP Count feature (7.7.2) |
7c657876 | 473 | * @dccps_ndp_count - number of Non Data Packets since last data packet |
91d73c15 | 474 | * @dccps_mss_cache - current value of MSS (path MTU minus header sizes) |
a94f0f97 | 475 | * @dccps_rate_last - timestamp for rate-limiting DCCP-Sync (RFC 4340, 7.5.4) |
ac75773c | 476 | * @dccps_featneg - tracks feature-negotiation state (mostly during handshake) |
ae31c339 | 477 | * @dccps_hc_rx_ackvec - rx half connection ack vector |
91d73c15 GR |
478 | * @dccps_hc_rx_ccid - CCID used for the receiver (or receiving half-connection) |
479 | * @dccps_hc_tx_ccid - CCID used for the sender (or sending half-connection) | |
480 | * @dccps_options_received - parsed set of retrieved options | |
871a2c16 TG |
481 | * @dccps_qpolicy - TX dequeueing policy, one of %dccp_packet_dequeueing_policy |
482 | * @dccps_tx_qlen - maximum length of the TX queue | |
91d73c15 GR |
483 | * @dccps_role - role of this sock, one of %dccp_role |
484 | * @dccps_hc_rx_insert_options - receiver wants to add options when acking | |
485 | * @dccps_hc_tx_insert_options - sender wants to add options when sending | |
b8599d20 | 486 | * @dccps_server_timewait - server holds timewait state on close (RFC 4340, 8.3) |
d83447f0 | 487 | * @dccps_sync_scheduled - flag which signals "send out-of-band message soon" |
dc841e30 GR |
488 | * @dccps_xmitlet - tasklet scheduled by the TX CCID to dequeue data packets |
489 | * @dccps_xmit_timer - used by the TX CCID to delay sending (rate-based pacing) | |
89560b53 | 490 | * @dccps_syn_rtt - RTT sample from Request/Response exchange (in usecs) |
7c657876 ACM |
491 | */ |
492 | struct dccp_sock { | |
493 | /* inet_connection_sock has to be the first member of dccp_sock */ | |
494 | struct inet_connection_sock dccps_inet_connection; | |
89560b53 | 495 | #define dccps_syn_rtt dccps_inet_connection.icsk_ack.lrcvtime |
7c657876 ACM |
496 | __u64 dccps_swl; |
497 | __u64 dccps_swh; | |
498 | __u64 dccps_awl; | |
499 | __u64 dccps_awh; | |
500 | __u64 dccps_iss; | |
501 | __u64 dccps_isr; | |
502 | __u64 dccps_osr; | |
503 | __u64 dccps_gss; | |
504 | __u64 dccps_gsr; | |
505 | __u64 dccps_gar; | |
60fe62e7 | 506 | __be32 dccps_service; |
cf6b5fbe | 507 | __u32 dccps_mss_cache; |
67e6b629 | 508 | struct dccp_service_list *dccps_service_list; |
7c657876 | 509 | __u32 dccps_timestamp_echo; |
b4d4f7c7 | 510 | __u32 dccps_timestamp_time; |
2a91aa39 AB |
511 | __u16 dccps_l_ack_ratio; |
512 | __u16 dccps_r_ack_ratio; | |
792b4878 GR |
513 | __u64 dccps_l_seq_win:48; |
514 | __u64 dccps_r_seq_win:48; | |
29450559 GR |
515 | __u8 dccps_pcslen:4; |
516 | __u8 dccps_pcrlen:4; | |
4098dce5 | 517 | __u8 dccps_send_ndp_count:1; |
5b5d0e70 | 518 | __u64 dccps_ndp_count:48; |
a94f0f97 | 519 | unsigned long dccps_rate_last; |
ac75773c | 520 | struct list_head dccps_featneg; |
ae31c339 | 521 | struct dccp_ackvec *dccps_hc_rx_ackvec; |
7c657876 ACM |
522 | struct ccid *dccps_hc_rx_ccid; |
523 | struct ccid *dccps_hc_tx_ccid; | |
524 | struct dccp_options_received dccps_options_received; | |
871a2c16 TG |
525 | __u8 dccps_qpolicy; |
526 | __u32 dccps_tx_qlen; | |
7c657876 | 527 | enum dccp_role dccps_role:2; |
507d37cf ACM |
528 | __u8 dccps_hc_rx_insert_options:1; |
529 | __u8 dccps_hc_tx_insert_options:1; | |
b8599d20 | 530 | __u8 dccps_server_timewait:1; |
d83447f0 | 531 | __u8 dccps_sync_scheduled:1; |
dc841e30 | 532 | struct tasklet_struct dccps_xmitlet; |
97e5848d | 533 | struct timer_list dccps_xmit_timer; |
7c657876 | 534 | }; |
8109b02b | 535 | |
7c657876 ACM |
536 | static inline struct dccp_sock *dccp_sk(const struct sock *sk) |
537 | { | |
538 | return (struct dccp_sock *)sk; | |
539 | } | |
540 | ||
541 | static inline const char *dccp_role(const struct sock *sk) | |
542 | { | |
543 | switch (dccp_sk(sk)->dccps_role) { | |
544 | case DCCP_ROLE_UNDEFINED: return "undefined"; | |
545 | case DCCP_ROLE_LISTEN: return "listen"; | |
546 | case DCCP_ROLE_SERVER: return "server"; | |
547 | case DCCP_ROLE_CLIENT: return "client"; | |
548 | } | |
549 | return NULL; | |
550 | } | |
551 | ||
c72e1183 ED |
552 | extern void dccp_syn_ack_timeout(struct sock *sk, struct request_sock *req); |
553 | ||
5a47a470 HW |
554 | #endif /* __KERNEL__ */ |
555 | ||
7c657876 | 556 | #endif /* _LINUX_DCCP_H */ |