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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, | |
168 | DCCPO_MIN_CCID_SPECIFIC = 128, | |
169 | DCCPO_MAX_CCID_SPECIFIC = 255, | |
170 | }; | |
171 | ||
b83eff64 IM |
172 | /* DCCP CCIDS */ |
173 | enum { | |
174 | DCCPC_CCID2 = 2, | |
175 | DCCPC_CCID3 = 3, | |
176 | }; | |
177 | ||
c02fdc0e | 178 | /* DCCP features (RFC 4340 section 6.4) */ |
8109b02b ACM |
179 | enum { |
180 | DCCPF_RESERVED = 0, | |
181 | DCCPF_CCID = 1, | |
c02fdc0e | 182 | DCCPF_SHORT_SEQNOS = 2, /* XXX: not yet implemented */ |
8109b02b | 183 | DCCPF_SEQUENCE_WINDOW = 3, |
c02fdc0e | 184 | DCCPF_ECN_INCAPABLE = 4, /* XXX: not yet implemented */ |
8109b02b ACM |
185 | DCCPF_ACK_RATIO = 5, |
186 | DCCPF_SEND_ACK_VECTOR = 6, | |
187 | DCCPF_SEND_NDP_COUNT = 7, | |
6f4e5fff | 188 | DCCPF_MIN_CSUM_COVER = 8, |
c02fdc0e | 189 | DCCPF_DATA_CHECKSUM = 9, /* XXX: not yet implemented */ |
8109b02b ACM |
190 | /* 10-127 reserved */ |
191 | DCCPF_MIN_CCID_SPECIFIC = 128, | |
192 | DCCPF_MAX_CCID_SPECIFIC = 255, | |
7c657876 ACM |
193 | }; |
194 | ||
afe00251 AB |
195 | /* this structure is argument to DCCP_SOCKOPT_CHANGE_X */ |
196 | struct dccp_so_feat { | |
197 | __u8 dccpsf_feat; | |
1acc04cd | 198 | __u8 __user *dccpsf_val; |
afe00251 AB |
199 | __u8 dccpsf_len; |
200 | }; | |
201 | ||
a84ffe43 | 202 | /* DCCP socket options */ |
5aed3243 | 203 | #define DCCP_SOCKOPT_PACKET_SIZE 1 /* XXX deprecated, without effect */ |
67e6b629 | 204 | #define DCCP_SOCKOPT_SERVICE 2 |
afe00251 AB |
205 | #define DCCP_SOCKOPT_CHANGE_L 3 |
206 | #define DCCP_SOCKOPT_CHANGE_R 4 | |
7c559a9e | 207 | #define DCCP_SOCKOPT_GET_CUR_MPS 5 |
b8599d20 | 208 | #define DCCP_SOCKOPT_SERVER_TIMEWAIT 6 |
6f4e5fff GR |
209 | #define DCCP_SOCKOPT_SEND_CSCOV 10 |
210 | #define DCCP_SOCKOPT_RECV_CSCOV 11 | |
88f964db ACM |
211 | #define DCCP_SOCKOPT_CCID_RX_INFO 128 |
212 | #define DCCP_SOCKOPT_CCID_TX_INFO 192 | |
67e6b629 | 213 | |
09dbc389 | 214 | /* maximum number of services provided on the same listening port */ |
67e6b629 | 215 | #define DCCP_SERVICE_LIST_MAX_LEN 32 |
a84ffe43 | 216 | |
5a47a470 HW |
217 | #ifdef __KERNEL__ |
218 | ||
219 | #include <linux/in.h> | |
19ac2146 | 220 | #include <linux/ktime.h> |
5a47a470 HW |
221 | #include <linux/list.h> |
222 | #include <linux/uio.h> | |
223 | #include <linux/workqueue.h> | |
224 | ||
225 | #include <net/inet_connection_sock.h> | |
14c85021 | 226 | #include <net/inet_sock.h> |
64cf1e5d | 227 | #include <net/inet_timewait_sock.h> |
5a47a470 | 228 | #include <net/tcp_states.h> |
5a47a470 HW |
229 | |
230 | enum dccp_state { | |
f11135a3 GR |
231 | DCCP_OPEN = TCP_ESTABLISHED, |
232 | DCCP_REQUESTING = TCP_SYN_SENT, | |
233 | DCCP_LISTEN = TCP_LISTEN, | |
234 | DCCP_RESPOND = TCP_SYN_RECV, | |
235 | /* | |
236 | * States involved in closing a DCCP connection: | |
237 | * 1) ACTIVE_CLOSEREQ is entered by a server sending a CloseReq. | |
238 | * | |
239 | * 2) CLOSING can have three different meanings (RFC 4340, 8.3): | |
240 | * a. Client has performed active-close, has sent a Close to the server | |
241 | * from state OPEN or PARTOPEN, and is waiting for the final Reset | |
242 | * (in this case, SOCK_DONE == 1). | |
243 | * b. Client is asked to perform passive-close, by receiving a CloseReq | |
244 | * in (PART)OPEN state. It sends a Close and waits for final Reset | |
245 | * (in this case, SOCK_DONE == 0). | |
246 | * c. Server performs an active-close as in (a), keeps TIMEWAIT state. | |
247 | * | |
248 | * 3) The following intermediate states are employed to give passively | |
249 | * closing nodes a chance to process their unread data: | |
250 | * - PASSIVE_CLOSE (from OPEN => CLOSED) and | |
251 | * - PASSIVE_CLOSEREQ (from (PART)OPEN to CLOSING; case (b) above). | |
252 | */ | |
253 | DCCP_ACTIVE_CLOSEREQ = TCP_FIN_WAIT1, | |
254 | DCCP_PASSIVE_CLOSE = TCP_CLOSE_WAIT, /* any node receiving a Close */ | |
255 | DCCP_CLOSING = TCP_CLOSING, | |
256 | DCCP_TIME_WAIT = TCP_TIME_WAIT, | |
257 | DCCP_CLOSED = TCP_CLOSE, | |
258 | DCCP_PARTOPEN = TCP_MAX_STATES, | |
259 | DCCP_PASSIVE_CLOSEREQ, /* clients receiving CloseReq */ | |
9b91ad27 | 260 | DCCP_MAX_STATES |
5a47a470 HW |
261 | }; |
262 | ||
f11135a3 | 263 | #define DCCP_STATE_MASK 0x1f |
5a47a470 HW |
264 | |
265 | enum { | |
f11135a3 GR |
266 | DCCPF_OPEN = TCPF_ESTABLISHED, |
267 | DCCPF_REQUESTING = TCPF_SYN_SENT, | |
268 | DCCPF_LISTEN = TCPF_LISTEN, | |
269 | DCCPF_RESPOND = TCPF_SYN_RECV, | |
270 | DCCPF_ACTIVE_CLOSEREQ = TCPF_FIN_WAIT1, | |
271 | DCCPF_CLOSING = TCPF_CLOSING, | |
272 | DCCPF_TIME_WAIT = TCPF_TIME_WAIT, | |
273 | DCCPF_CLOSED = TCPF_CLOSE, | |
274 | DCCPF_PARTOPEN = (1 << DCCP_PARTOPEN), | |
5a47a470 HW |
275 | }; |
276 | ||
277 | static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb) | |
278 | { | |
9c70220b | 279 | return (struct dccp_hdr *)skb_transport_header(skb); |
5a47a470 HW |
280 | } |
281 | ||
9b42078e GR |
282 | static inline struct dccp_hdr *dccp_zeroed_hdr(struct sk_buff *skb, int headlen) |
283 | { | |
badff6d0 ACM |
284 | skb_push(skb, headlen); |
285 | skb_reset_transport_header(skb); | |
9c70220b | 286 | return memset(skb_transport_header(skb), 0, headlen); |
9b42078e GR |
287 | } |
288 | ||
fde20105 | 289 | static inline struct dccp_hdr_ext *dccp_hdrx(const struct dccp_hdr *dh) |
5a47a470 | 290 | { |
fde20105 | 291 | return (struct dccp_hdr_ext *)((unsigned char *)dh + sizeof(*dh)); |
5a47a470 HW |
292 | } |
293 | ||
1d3de414 HW |
294 | static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh) |
295 | { | |
296 | return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0); | |
297 | } | |
298 | ||
5a47a470 HW |
299 | static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb) |
300 | { | |
301 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
1d3de414 | 302 | return __dccp_basic_hdr_len(dh); |
5a47a470 HW |
303 | } |
304 | ||
fde20105 | 305 | static inline __u64 dccp_hdr_seq(const struct dccp_hdr *dh) |
5a47a470 | 306 | { |
60fe62e7 | 307 | __u64 seq_nr = ntohs(dh->dccph_seq); |
5a47a470 HW |
308 | |
309 | if (dh->dccph_x != 0) | |
fde20105 | 310 | seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(dh)->dccph_seq_low); |
60fe62e7 AB |
311 | else |
312 | seq_nr += (u32)dh->dccph_seq2 << 16; | |
5a47a470 HW |
313 | |
314 | return seq_nr; | |
315 | } | |
316 | ||
317 | static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb) | |
318 | { | |
9c70220b ACM |
319 | return (struct dccp_hdr_request *)(skb_transport_header(skb) + |
320 | dccp_basic_hdr_len(skb)); | |
5a47a470 HW |
321 | } |
322 | ||
323 | static inline struct dccp_hdr_ack_bits *dccp_hdr_ack_bits(const struct sk_buff *skb) | |
324 | { | |
9c70220b ACM |
325 | return (struct dccp_hdr_ack_bits *)(skb_transport_header(skb) + |
326 | dccp_basic_hdr_len(skb)); | |
5a47a470 HW |
327 | } |
328 | ||
329 | static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb) | |
330 | { | |
331 | const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb); | |
60fe62e7 | 332 | return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) + ntohl(dhack->dccph_ack_nr_low); |
5a47a470 HW |
333 | } |
334 | ||
335 | static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb) | |
336 | { | |
9c70220b ACM |
337 | return (struct dccp_hdr_response *)(skb_transport_header(skb) + |
338 | dccp_basic_hdr_len(skb)); | |
5a47a470 HW |
339 | } |
340 | ||
341 | static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb) | |
342 | { | |
9c70220b ACM |
343 | return (struct dccp_hdr_reset *)(skb_transport_header(skb) + |
344 | dccp_basic_hdr_len(skb)); | |
5a47a470 HW |
345 | } |
346 | ||
1d3de414 HW |
347 | static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh) |
348 | { | |
349 | return __dccp_basic_hdr_len(dh) + | |
350 | dccp_packet_hdr_len(dh->dccph_type); | |
351 | } | |
352 | ||
5a47a470 HW |
353 | static inline unsigned int dccp_hdr_len(const struct sk_buff *skb) |
354 | { | |
1d3de414 | 355 | return __dccp_hdr_len(dccp_hdr(skb)); |
5a47a470 HW |
356 | } |
357 | ||
358 | ||
7c657876 ACM |
359 | /* initial values for each feature */ |
360 | #define DCCPF_INITIAL_SEQUENCE_WINDOW 100 | |
afe00251 | 361 | #define DCCPF_INITIAL_ACK_RATIO 2 |
b83eff64 | 362 | #define DCCPF_INITIAL_CCID DCCPC_CCID2 |
2a91aa39 | 363 | #define DCCPF_INITIAL_SEND_ACK_VECTOR 1 |
7c657876 ACM |
364 | /* FIXME: for now we're default to 1 but it should really be 0 */ |
365 | #define DCCPF_INITIAL_SEND_NDP_COUNT 1 | |
366 | ||
7c657876 | 367 | /** |
a4bf3902 ACM |
368 | * struct dccp_minisock - Minimal DCCP connection representation |
369 | * | |
370 | * Will be used to pass the state from dccp_request_sock to dccp_sock. | |
371 | * | |
372 | * @dccpms_sequence_window - Sequence Window Feature (section 7.5.2) | |
373 | * @dccpms_ccid - Congestion Control Id (CCID) (section 10) | |
374 | * @dccpms_send_ack_vector - Send Ack Vector Feature (section 11.5) | |
375 | * @dccpms_send_ndp_count - Send NDP Count Feature (7.7.2) | |
09dbc389 GR |
376 | * @dccpms_ack_ratio - Ack Ratio Feature (section 11.3) |
377 | * @dccpms_pending - List of features being negotiated | |
378 | * @dccpms_conf - | |
7c657876 | 379 | */ |
a4bf3902 ACM |
380 | struct dccp_minisock { |
381 | __u64 dccpms_sequence_window; | |
382 | __u8 dccpms_rx_ccid; | |
383 | __u8 dccpms_tx_ccid; | |
384 | __u8 dccpms_send_ack_vector; | |
385 | __u8 dccpms_send_ndp_count; | |
386 | __u8 dccpms_ack_ratio; | |
387 | struct list_head dccpms_pending; | |
388 | struct list_head dccpms_conf; | |
afe00251 AB |
389 | }; |
390 | ||
391 | struct dccp_opt_conf { | |
392 | __u8 *dccpoc_val; | |
393 | __u8 dccpoc_len; | |
394 | }; | |
395 | ||
396 | struct dccp_opt_pend { | |
397 | struct list_head dccpop_node; | |
398 | __u8 dccpop_type; | |
399 | __u8 dccpop_feat; | |
400 | __u8 *dccpop_val; | |
401 | __u8 dccpop_len; | |
402 | int dccpop_conf; | |
403 | struct dccp_opt_conf *dccpop_sc; | |
7c657876 ACM |
404 | }; |
405 | ||
a4bf3902 ACM |
406 | extern void dccp_minisock_init(struct dccp_minisock *dmsk); |
407 | ||
b4d4f7c7 GR |
408 | /** |
409 | * struct dccp_request_sock - represent DCCP-specific connection request | |
410 | * @dreq_inet_rsk: structure inherited from | |
411 | * @dreq_iss: initial sequence number sent on the Response (RFC 4340, 7.1) | |
412 | * @dreq_isr: initial sequence number received on the Request | |
413 | * @dreq_service: service code present on the Request (there is just one) | |
414 | * The following two fields are analogous to the ones in dccp_sock: | |
415 | * @dreq_timestamp_echo: last received timestamp to echo (13.1) | |
416 | * @dreq_timestamp_echo: the time of receiving the last @dreq_timestamp_echo | |
417 | */ | |
7c657876 ACM |
418 | struct dccp_request_sock { |
419 | struct inet_request_sock dreq_inet_rsk; | |
420 | __u64 dreq_iss; | |
421 | __u64 dreq_isr; | |
60fe62e7 | 422 | __be32 dreq_service; |
b4d4f7c7 GR |
423 | __u32 dreq_timestamp_echo; |
424 | __u32 dreq_timestamp_time; | |
7c657876 ACM |
425 | }; |
426 | ||
427 | static inline struct dccp_request_sock *dccp_rsk(const struct request_sock *req) | |
428 | { | |
429 | return (struct dccp_request_sock *)req; | |
430 | } | |
431 | ||
64cf1e5d ACM |
432 | extern struct inet_timewait_death_row dccp_death_row; |
433 | ||
8b819412 GR |
434 | extern int dccp_parse_options(struct sock *sk, struct dccp_request_sock *dreq, |
435 | struct sk_buff *skb); | |
436 | ||
7c657876 | 437 | struct dccp_options_received { |
5b5d0e70 | 438 | u64 dccpor_ndp:48; |
7c657876 ACM |
439 | u32 dccpor_timestamp; |
440 | u32 dccpor_timestamp_echo; | |
441 | u32 dccpor_elapsed_time; | |
442 | }; | |
443 | ||
444 | struct ccid; | |
445 | ||
446 | enum dccp_role { | |
447 | DCCP_ROLE_UNDEFINED, | |
448 | DCCP_ROLE_LISTEN, | |
449 | DCCP_ROLE_CLIENT, | |
450 | DCCP_ROLE_SERVER, | |
451 | }; | |
452 | ||
67e6b629 ACM |
453 | struct dccp_service_list { |
454 | __u32 dccpsl_nr; | |
60fe62e7 | 455 | __be32 dccpsl_list[0]; |
67e6b629 ACM |
456 | }; |
457 | ||
458 | #define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1) | |
8109b02b | 459 | #define DCCP_SERVICE_CODE_IS_ABSENT 0 |
67e6b629 ACM |
460 | |
461 | static inline int dccp_list_has_service(const struct dccp_service_list *sl, | |
60fe62e7 | 462 | const __be32 service) |
67e6b629 ACM |
463 | { |
464 | if (likely(sl != NULL)) { | |
465 | u32 i = sl->dccpsl_nr; | |
466 | while (i--) | |
467 | if (sl->dccpsl_list[i] == service) | |
8109b02b | 468 | return 1; |
67e6b629 ACM |
469 | } |
470 | return 0; | |
471 | } | |
472 | ||
ae31c339 ACM |
473 | struct dccp_ackvec; |
474 | ||
7c657876 ACM |
475 | /** |
476 | * struct dccp_sock - DCCP socket state | |
477 | * | |
478 | * @dccps_swl - sequence number window low | |
479 | * @dccps_swh - sequence number window high | |
480 | * @dccps_awl - acknowledgement number window low | |
481 | * @dccps_awh - acknowledgement number window high | |
482 | * @dccps_iss - initial sequence number sent | |
483 | * @dccps_isr - initial sequence number received | |
484 | * @dccps_osr - first OPEN sequence number received | |
485 | * @dccps_gss - greatest sequence number sent | |
486 | * @dccps_gsr - greatest valid sequence number received | |
487 | * @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss | |
09dbc389 GR |
488 | * @dccps_service - first (passive sock) or unique (active sock) service code |
489 | * @dccps_service_list - second .. last service code on passive socket | |
7c657876 | 490 | * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option |
b4d4f7c7 | 491 | * @dccps_timestamp_time - time of receiving latest @dccps_timestamp_echo |
91d73c15 GR |
492 | * @dccps_l_ack_ratio - feature-local Ack Ratio |
493 | * @dccps_r_ack_ratio - feature-remote Ack Ratio | |
6f4e5fff GR |
494 | * @dccps_pcslen - sender partial checksum coverage (via sockopt) |
495 | * @dccps_pcrlen - receiver partial checksum coverage (via sockopt) | |
7c657876 | 496 | * @dccps_ndp_count - number of Non Data Packets since last data packet |
91d73c15 | 497 | * @dccps_mss_cache - current value of MSS (path MTU minus header sizes) |
a94f0f97 | 498 | * @dccps_rate_last - timestamp for rate-limiting DCCP-Sync (RFC 4340, 7.5.4) |
91d73c15 | 499 | * @dccps_minisock - associated minisock (accessed via dccp_msk) |
ae31c339 | 500 | * @dccps_hc_rx_ackvec - rx half connection ack vector |
91d73c15 GR |
501 | * @dccps_hc_rx_ccid - CCID used for the receiver (or receiving half-connection) |
502 | * @dccps_hc_tx_ccid - CCID used for the sender (or sending half-connection) | |
503 | * @dccps_options_received - parsed set of retrieved options | |
504 | * @dccps_role - role of this sock, one of %dccp_role | |
505 | * @dccps_hc_rx_insert_options - receiver wants to add options when acking | |
506 | * @dccps_hc_tx_insert_options - sender wants to add options when sending | |
b8599d20 | 507 | * @dccps_server_timewait - server holds timewait state on close (RFC 4340, 8.3) |
97e5848d | 508 | * @dccps_xmit_timer - timer for when CCID is not ready to send |
89560b53 | 509 | * @dccps_syn_rtt - RTT sample from Request/Response exchange (in usecs) |
7c657876 ACM |
510 | */ |
511 | struct dccp_sock { | |
512 | /* inet_connection_sock has to be the first member of dccp_sock */ | |
513 | struct inet_connection_sock dccps_inet_connection; | |
89560b53 | 514 | #define dccps_syn_rtt dccps_inet_connection.icsk_ack.lrcvtime |
7c657876 ACM |
515 | __u64 dccps_swl; |
516 | __u64 dccps_swh; | |
517 | __u64 dccps_awl; | |
518 | __u64 dccps_awh; | |
519 | __u64 dccps_iss; | |
520 | __u64 dccps_isr; | |
521 | __u64 dccps_osr; | |
522 | __u64 dccps_gss; | |
523 | __u64 dccps_gsr; | |
524 | __u64 dccps_gar; | |
60fe62e7 | 525 | __be32 dccps_service; |
cf6b5fbe | 526 | __u32 dccps_mss_cache; |
67e6b629 | 527 | struct dccp_service_list *dccps_service_list; |
7c657876 | 528 | __u32 dccps_timestamp_echo; |
b4d4f7c7 | 529 | __u32 dccps_timestamp_time; |
2a91aa39 AB |
530 | __u16 dccps_l_ack_ratio; |
531 | __u16 dccps_r_ack_ratio; | |
6f4e5fff GR |
532 | __u16 dccps_pcslen; |
533 | __u16 dccps_pcrlen; | |
5b5d0e70 | 534 | __u64 dccps_ndp_count:48; |
a94f0f97 | 535 | unsigned long dccps_rate_last; |
a4bf3902 | 536 | struct dccp_minisock dccps_minisock; |
ae31c339 | 537 | struct dccp_ackvec *dccps_hc_rx_ackvec; |
7c657876 ACM |
538 | struct ccid *dccps_hc_rx_ccid; |
539 | struct ccid *dccps_hc_tx_ccid; | |
540 | struct dccp_options_received dccps_options_received; | |
541 | enum dccp_role dccps_role:2; | |
507d37cf ACM |
542 | __u8 dccps_hc_rx_insert_options:1; |
543 | __u8 dccps_hc_tx_insert_options:1; | |
b8599d20 | 544 | __u8 dccps_server_timewait:1; |
97e5848d | 545 | struct timer_list dccps_xmit_timer; |
7c657876 | 546 | }; |
8109b02b | 547 | |
7c657876 ACM |
548 | static inline struct dccp_sock *dccp_sk(const struct sock *sk) |
549 | { | |
550 | return (struct dccp_sock *)sk; | |
551 | } | |
552 | ||
a4bf3902 ACM |
553 | static inline struct dccp_minisock *dccp_msk(const struct sock *sk) |
554 | { | |
555 | return (struct dccp_minisock *)&dccp_sk(sk)->dccps_minisock; | |
556 | } | |
557 | ||
7c657876 ACM |
558 | static inline const char *dccp_role(const struct sock *sk) |
559 | { | |
560 | switch (dccp_sk(sk)->dccps_role) { | |
561 | case DCCP_ROLE_UNDEFINED: return "undefined"; | |
562 | case DCCP_ROLE_LISTEN: return "listen"; | |
563 | case DCCP_ROLE_SERVER: return "server"; | |
564 | case DCCP_ROLE_CLIENT: return "client"; | |
565 | } | |
566 | return NULL; | |
567 | } | |
568 | ||
5a47a470 HW |
569 | #endif /* __KERNEL__ */ |
570 | ||
7c657876 | 571 | #endif /* _LINUX_DCCP_H */ |