1 #ifndef _LINUX_DCCP_H
2 #define _LINUX_DCCP_H
3
4 #include <linux/types.h>
5 #include <asm/byteorder.h>
6
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 {
21 __be16 dccph_sport,
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
33 __sum16 dccph_checksum;
34 #if defined(__LITTLE_ENDIAN_BITFIELD)
35 __u8 dccph_x:1,
36 dccph_type:4,
37 dccph_reserved:3;
38 #elif defined(__BIG_ENDIAN_BITFIELD)
39 __u8 dccph_reserved:3,
40 dccph_type:4,
41 dccph_x:1;
42 #else
43 #error "Adjust your <asm/byteorder.h> defines"
44 #endif
45 __u8 dccph_seq2;
46 __be16 dccph_seq;
47 };
48
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 {
55 __be32 dccph_seq_low;
56 };
57
58 /**
59 * struct dccp_hdr_request - Connection initiation request header
60 *
61 * @dccph_req_service - Service to which the client app wants to connect
62 */
63 struct dccp_hdr_request {
64 __be32 dccph_req_service;
65 };
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 {
73 __be16 dccph_reserved1;
74 __be16 dccph_ack_nr_high;
75 __be32 dccph_ack_nr_low;
76 };
77 /**
78 * struct dccp_hdr_response - Connection initiation response header
79 *
80 * @dccph_resp_ack - 48 bit Acknowledgment Number Subheader (5.3)
81 * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
82 */
83 struct dccp_hdr_response {
84 struct dccp_hdr_ack_bits dccph_resp_ack;
85 __be32 dccph_resp_service;
86 };
87
88 /**
89 * struct dccp_hdr_reset - Unconditionally shut down a connection
90 *
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
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
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
dccp_packet_hdr_len(const __u8 type)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 }
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,
147
148 DCCP_MAX_RESET_CODES /* Leave at the end! */
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,
157 DCCPO_CHANGE_L = 32,
158 DCCPO_CONFIRM_L = 33,
159 DCCPO_CHANGE_R = 34,
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,
167 DCCPO_MAX = 45,
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,
172 };
173 /* maximum size of a single TLV-encoded DCCP option (sans type/len bytes) */
174 #define DCCP_SINGLE_OPT_MAXLEN 253
175
176 /* DCCP CCIDS */
177 enum {
178 DCCPC_CCID2 = 2,
179 DCCPC_CCID3 = 3,
180 };
181
182 /* DCCP features (RFC 4340 section 6.4) */
183 enum dccp_feature_numbers {
184 DCCPF_RESERVED = 0,
185 DCCPF_CCID = 1,
186 DCCPF_SHORT_SEQNOS = 2,
187 DCCPF_SEQUENCE_WINDOW = 3,
188 DCCPF_ECN_INCAPABLE = 4,
189 DCCPF_ACK_RATIO = 5,
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,
198 };
199
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
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
232
233 /* maximum number of services provided on the same listening port */
234 #define DCCP_SERVICE_LIST_MAX_LEN 32
235
236 #ifdef __KERNEL__
237
238 #include <linux/in.h>
239 #include <linux/ktime.h>
240 #include <linux/list.h>
241 #include <linux/uio.h>
242 #include <linux/workqueue.h>
243
244 #include <net/inet_connection_sock.h>
245 #include <net/inet_sock.h>
246 #include <net/inet_timewait_sock.h>
247 #include <net/tcp_states.h>
248
249 enum dccp_state {
250 DCCP_OPEN = TCP_ESTABLISHED,
251 DCCP_REQUESTING = TCP_SYN_SENT,
252 DCCP_LISTEN = TCP_LISTEN,
253 DCCP_RESPOND = TCP_SYN_RECV,
254 /*
255 * States involved in closing a DCCP connection:
256 * 1) ACTIVE_CLOSEREQ is entered by a server sending a CloseReq.
257 *
258 * 2) CLOSING can have three different meanings (RFC 4340, 8.3):
259 * a. Client has performed active-close, has sent a Close to the server
260 * from state OPEN or PARTOPEN, and is waiting for the final Reset
261 * (in this case, SOCK_DONE == 1).
262 * b. Client is asked to perform passive-close, by receiving a CloseReq
263 * in (PART)OPEN state. It sends a Close and waits for final Reset
264 * (in this case, SOCK_DONE == 0).
265 * c. Server performs an active-close as in (a), keeps TIMEWAIT state.
266 *
267 * 3) The following intermediate states are employed to give passively
268 * closing nodes a chance to process their unread data:
269 * - PASSIVE_CLOSE (from OPEN => CLOSED) and
270 * - PASSIVE_CLOSEREQ (from (PART)OPEN to CLOSING; case (b) above).
271 */
272 DCCP_ACTIVE_CLOSEREQ = TCP_FIN_WAIT1,
273 DCCP_PASSIVE_CLOSE = TCP_CLOSE_WAIT, /* any node receiving a Close */
274 DCCP_CLOSING = TCP_CLOSING,
275 DCCP_TIME_WAIT = TCP_TIME_WAIT,
276 DCCP_CLOSED = TCP_CLOSE,
277 DCCP_PARTOPEN = TCP_MAX_STATES,
278 DCCP_PASSIVE_CLOSEREQ, /* clients receiving CloseReq */
279 DCCP_MAX_STATES
280 };
281
282 enum {
283 DCCPF_OPEN = TCPF_ESTABLISHED,
284 DCCPF_REQUESTING = TCPF_SYN_SENT,
285 DCCPF_LISTEN = TCPF_LISTEN,
286 DCCPF_RESPOND = TCPF_SYN_RECV,
287 DCCPF_ACTIVE_CLOSEREQ = TCPF_FIN_WAIT1,
288 DCCPF_CLOSING = TCPF_CLOSING,
289 DCCPF_TIME_WAIT = TCPF_TIME_WAIT,
290 DCCPF_CLOSED = TCPF_CLOSE,
291 DCCPF_PARTOPEN = (1 << DCCP_PARTOPEN),
292 };
293
dccp_hdr(const struct sk_buff * skb)294 static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb)
295 {
296 return (struct dccp_hdr *)skb_transport_header(skb);
297 }
298
dccp_zeroed_hdr(struct sk_buff * skb,int headlen)299 static inline struct dccp_hdr *dccp_zeroed_hdr(struct sk_buff *skb, int headlen)
300 {
301 skb_push(skb, headlen);
302 skb_reset_transport_header(skb);
303 return memset(skb_transport_header(skb), 0, headlen);
304 }
305
dccp_hdrx(const struct dccp_hdr * dh)306 static inline struct dccp_hdr_ext *dccp_hdrx(const struct dccp_hdr *dh)
307 {
308 return (struct dccp_hdr_ext *)((unsigned char *)dh + sizeof(*dh));
309 }
310
__dccp_basic_hdr_len(const struct dccp_hdr * dh)311 static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh)
312 {
313 return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);
314 }
315
dccp_basic_hdr_len(const struct sk_buff * skb)316 static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)
317 {
318 const struct dccp_hdr *dh = dccp_hdr(skb);
319 return __dccp_basic_hdr_len(dh);
320 }
321
dccp_hdr_seq(const struct dccp_hdr * dh)322 static inline __u64 dccp_hdr_seq(const struct dccp_hdr *dh)
323 {
324 __u64 seq_nr = ntohs(dh->dccph_seq);
325
326 if (dh->dccph_x != 0)
327 seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(dh)->dccph_seq_low);
328 else
329 seq_nr += (u32)dh->dccph_seq2 << 16;
330
331 return seq_nr;
332 }
333
dccp_hdr_request(struct sk_buff * skb)334 static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb)
335 {
336 return (struct dccp_hdr_request *)(skb_transport_header(skb) +
337 dccp_basic_hdr_len(skb));
338 }
339
dccp_hdr_ack_bits(const struct sk_buff * skb)340 static inline struct dccp_hdr_ack_bits *dccp_hdr_ack_bits(const struct sk_buff *skb)
341 {
342 return (struct dccp_hdr_ack_bits *)(skb_transport_header(skb) +
343 dccp_basic_hdr_len(skb));
344 }
345
dccp_hdr_ack_seq(const struct sk_buff * skb)346 static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb)
347 {
348 const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb);
349 return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) + ntohl(dhack->dccph_ack_nr_low);
350 }
351
dccp_hdr_response(struct sk_buff * skb)352 static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb)
353 {
354 return (struct dccp_hdr_response *)(skb_transport_header(skb) +
355 dccp_basic_hdr_len(skb));
356 }
357
dccp_hdr_reset(struct sk_buff * skb)358 static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb)
359 {
360 return (struct dccp_hdr_reset *)(skb_transport_header(skb) +
361 dccp_basic_hdr_len(skb));
362 }
363
__dccp_hdr_len(const struct dccp_hdr * dh)364 static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh)
365 {
366 return __dccp_basic_hdr_len(dh) +
367 dccp_packet_hdr_len(dh->dccph_type);
368 }
369
dccp_hdr_len(const struct sk_buff * skb)370 static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
371 {
372 return __dccp_hdr_len(dccp_hdr(skb));
373 }
374
375 /**
376 * struct dccp_request_sock - represent DCCP-specific connection request
377 * @dreq_inet_rsk: structure inherited from
378 * @dreq_iss: initial sequence number sent on the Response (RFC 4340, 7.1)
379 * @dreq_isr: initial sequence number received on the Request
380 * @dreq_service: service code present on the Request (there is just one)
381 * @dreq_featneg: feature negotiation options for this connection
382 * The following two fields are analogous to the ones in dccp_sock:
383 * @dreq_timestamp_echo: last received timestamp to echo (13.1)
384 * @dreq_timestamp_echo: the time of receiving the last @dreq_timestamp_echo
385 */
386 struct dccp_request_sock {
387 struct inet_request_sock dreq_inet_rsk;
388 __u64 dreq_iss;
389 __u64 dreq_isr;
390 __be32 dreq_service;
391 struct list_head dreq_featneg;
392 __u32 dreq_timestamp_echo;
393 __u32 dreq_timestamp_time;
394 };
395
dccp_rsk(const struct request_sock * req)396 static inline struct dccp_request_sock *dccp_rsk(const struct request_sock *req)
397 {
398 return (struct dccp_request_sock *)req;
399 }
400
401 extern struct inet_timewait_death_row dccp_death_row;
402
403 extern int dccp_parse_options(struct sock *sk, struct dccp_request_sock *dreq,
404 struct sk_buff *skb);
405
406 struct dccp_options_received {
407 u64 dccpor_ndp:48;
408 u32 dccpor_timestamp;
409 u32 dccpor_timestamp_echo;
410 u32 dccpor_elapsed_time;
411 };
412
413 struct ccid;
414
415 enum dccp_role {
416 DCCP_ROLE_UNDEFINED,
417 DCCP_ROLE_LISTEN,
418 DCCP_ROLE_CLIENT,
419 DCCP_ROLE_SERVER,
420 };
421
422 struct dccp_service_list {
423 __u32 dccpsl_nr;
424 __be32 dccpsl_list[0];
425 };
426
427 #define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1)
428 #define DCCP_SERVICE_CODE_IS_ABSENT 0
429
dccp_list_has_service(const struct dccp_service_list * sl,const __be32 service)430 static inline int dccp_list_has_service(const struct dccp_service_list *sl,
431 const __be32 service)
432 {
433 if (likely(sl != NULL)) {
434 u32 i = sl->dccpsl_nr;
435 while (i--)
436 if (sl->dccpsl_list[i] == service)
437 return 1;
438 }
439 return 0;
440 }
441
442 struct dccp_ackvec;
443
444 /**
445 * struct dccp_sock - DCCP socket state
446 *
447 * @dccps_swl - sequence number window low
448 * @dccps_swh - sequence number window high
449 * @dccps_awl - acknowledgement number window low
450 * @dccps_awh - acknowledgement number window high
451 * @dccps_iss - initial sequence number sent
452 * @dccps_isr - initial sequence number received
453 * @dccps_osr - first OPEN sequence number received
454 * @dccps_gss - greatest sequence number sent
455 * @dccps_gsr - greatest valid sequence number received
456 * @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss
457 * @dccps_service - first (passive sock) or unique (active sock) service code
458 * @dccps_service_list - second .. last service code on passive socket
459 * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
460 * @dccps_timestamp_time - time of receiving latest @dccps_timestamp_echo
461 * @dccps_l_ack_ratio - feature-local Ack Ratio
462 * @dccps_r_ack_ratio - feature-remote Ack Ratio
463 * @dccps_l_seq_win - local Sequence Window (influences ack number validity)
464 * @dccps_r_seq_win - remote Sequence Window (influences seq number validity)
465 * @dccps_pcslen - sender partial checksum coverage (via sockopt)
466 * @dccps_pcrlen - receiver partial checksum coverage (via sockopt)
467 * @dccps_send_ndp_count - local Send NDP Count feature (7.7.2)
468 * @dccps_ndp_count - number of Non Data Packets since last data packet
469 * @dccps_mss_cache - current value of MSS (path MTU minus header sizes)
470 * @dccps_rate_last - timestamp for rate-limiting DCCP-Sync (RFC 4340, 7.5.4)
471 * @dccps_featneg - tracks feature-negotiation state (mostly during handshake)
472 * @dccps_hc_rx_ackvec - rx half connection ack vector
473 * @dccps_hc_rx_ccid - CCID used for the receiver (or receiving half-connection)
474 * @dccps_hc_tx_ccid - CCID used for the sender (or sending half-connection)
475 * @dccps_options_received - parsed set of retrieved options
476 * @dccps_qpolicy - TX dequeueing policy, one of %dccp_packet_dequeueing_policy
477 * @dccps_tx_qlen - maximum length of the TX queue
478 * @dccps_role - role of this sock, one of %dccp_role
479 * @dccps_hc_rx_insert_options - receiver wants to add options when acking
480 * @dccps_hc_tx_insert_options - sender wants to add options when sending
481 * @dccps_server_timewait - server holds timewait state on close (RFC 4340, 8.3)
482 * @dccps_sync_scheduled - flag which signals "send out-of-band message soon"
483 * @dccps_xmitlet - tasklet scheduled by the TX CCID to dequeue data packets
484 * @dccps_xmit_timer - used by the TX CCID to delay sending (rate-based pacing)
485 * @dccps_syn_rtt - RTT sample from Request/Response exchange (in usecs)
486 */
487 struct dccp_sock {
488 /* inet_connection_sock has to be the first member of dccp_sock */
489 struct inet_connection_sock dccps_inet_connection;
490 #define dccps_syn_rtt dccps_inet_connection.icsk_ack.lrcvtime
491 __u64 dccps_swl;
492 __u64 dccps_swh;
493 __u64 dccps_awl;
494 __u64 dccps_awh;
495 __u64 dccps_iss;
496 __u64 dccps_isr;
497 __u64 dccps_osr;
498 __u64 dccps_gss;
499 __u64 dccps_gsr;
500 __u64 dccps_gar;
501 __be32 dccps_service;
502 __u32 dccps_mss_cache;
503 struct dccp_service_list *dccps_service_list;
504 __u32 dccps_timestamp_echo;
505 __u32 dccps_timestamp_time;
506 __u16 dccps_l_ack_ratio;
507 __u16 dccps_r_ack_ratio;
508 __u64 dccps_l_seq_win:48;
509 __u64 dccps_r_seq_win:48;
510 __u8 dccps_pcslen:4;
511 __u8 dccps_pcrlen:4;
512 __u8 dccps_send_ndp_count:1;
513 __u64 dccps_ndp_count:48;
514 unsigned long dccps_rate_last;
515 struct list_head dccps_featneg;
516 struct dccp_ackvec *dccps_hc_rx_ackvec;
517 struct ccid *dccps_hc_rx_ccid;
518 struct ccid *dccps_hc_tx_ccid;
519 struct dccp_options_received dccps_options_received;
520 __u8 dccps_qpolicy;
521 __u32 dccps_tx_qlen;
522 enum dccp_role dccps_role:2;
523 __u8 dccps_hc_rx_insert_options:1;
524 __u8 dccps_hc_tx_insert_options:1;
525 __u8 dccps_server_timewait:1;
526 __u8 dccps_sync_scheduled:1;
527 struct tasklet_struct dccps_xmitlet;
528 struct timer_list dccps_xmit_timer;
529 };
530
dccp_sk(const struct sock * sk)531 static inline struct dccp_sock *dccp_sk(const struct sock *sk)
532 {
533 return (struct dccp_sock *)sk;
534 }
535
dccp_role(const struct sock * sk)536 static inline const char *dccp_role(const struct sock *sk)
537 {
538 switch (dccp_sk(sk)->dccps_role) {
539 case DCCP_ROLE_UNDEFINED: return "undefined";
540 case DCCP_ROLE_LISTEN: return "listen";
541 case DCCP_ROLE_SERVER: return "server";
542 case DCCP_ROLE_CLIENT: return "client";
543 }
544 return NULL;
545 }
546
547 #endif /* __KERNEL__ */
548
549 #endif /* _LINUX_DCCP_H */
550