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 __u16 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 - Conection initiation request header
60 *
61 * @dccph_req_service - Service to which the client app wants to connect
62 * @dccph_req_options - list of options (must be a multiple of 32 bits
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 - Conection initiation response header
80 *
81 * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR
82 * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR
83 * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
84 * @dccph_resp_options - list of options (must be a multiple of 32 bits
85 */
86 struct dccp_hdr_response {
87 struct dccp_hdr_ack_bits dccph_resp_ack;
88 __be32 dccph_resp_service;
89 };
90
91 /**
92 * struct dccp_hdr_reset - Unconditionally shut down a connection
93 *
94 * @dccph_reset_service - Echoes the Service Code on a received DCCP-Request
95 * @dccph_reset_options - list of options (must be a multiple of 32 bits
96 */
97 struct dccp_hdr_reset {
98 struct dccp_hdr_ack_bits dccph_reset_ack;
99 __u8 dccph_reset_code,
100 dccph_reset_data[3];
101 };
102
103 enum dccp_pkt_type {
104 DCCP_PKT_REQUEST = 0,
105 DCCP_PKT_RESPONSE,
106 DCCP_PKT_DATA,
107 DCCP_PKT_ACK,
108 DCCP_PKT_DATAACK,
109 DCCP_PKT_CLOSEREQ,
110 DCCP_PKT_CLOSE,
111 DCCP_PKT_RESET,
112 DCCP_PKT_SYNC,
113 DCCP_PKT_SYNCACK,
114 DCCP_PKT_INVALID,
115 };
116
117 #define DCCP_NR_PKT_TYPES DCCP_PKT_INVALID
118
dccp_packet_hdr_len(const __u8 type)119 static inline unsigned int dccp_packet_hdr_len(const __u8 type)
120 {
121 if (type == DCCP_PKT_DATA)
122 return 0;
123 if (type == DCCP_PKT_DATAACK ||
124 type == DCCP_PKT_ACK ||
125 type == DCCP_PKT_SYNC ||
126 type == DCCP_PKT_SYNCACK ||
127 type == DCCP_PKT_CLOSE ||
128 type == DCCP_PKT_CLOSEREQ)
129 return sizeof(struct dccp_hdr_ack_bits);
130 if (type == DCCP_PKT_REQUEST)
131 return sizeof(struct dccp_hdr_request);
132 if (type == DCCP_PKT_RESPONSE)
133 return sizeof(struct dccp_hdr_response);
134 return sizeof(struct dccp_hdr_reset);
135 }
136 enum dccp_reset_codes {
137 DCCP_RESET_CODE_UNSPECIFIED = 0,
138 DCCP_RESET_CODE_CLOSED,
139 DCCP_RESET_CODE_ABORTED,
140 DCCP_RESET_CODE_NO_CONNECTION,
141 DCCP_RESET_CODE_PACKET_ERROR,
142 DCCP_RESET_CODE_OPTION_ERROR,
143 DCCP_RESET_CODE_MANDATORY_ERROR,
144 DCCP_RESET_CODE_CONNECTION_REFUSED,
145 DCCP_RESET_CODE_BAD_SERVICE_CODE,
146 DCCP_RESET_CODE_TOO_BUSY,
147 DCCP_RESET_CODE_BAD_INIT_COOKIE,
148 DCCP_RESET_CODE_AGGRESSION_PENALTY,
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_CCID_SPECIFIC = 128,
169 DCCPO_MAX_CCID_SPECIFIC = 255,
170 };
171
172 /* DCCP features */
173 enum {
174 DCCPF_RESERVED = 0,
175 DCCPF_CCID = 1,
176 DCCPF_SEQUENCE_WINDOW = 3,
177 DCCPF_ACK_RATIO = 5,
178 DCCPF_SEND_ACK_VECTOR = 6,
179 DCCPF_SEND_NDP_COUNT = 7,
180 /* 10-127 reserved */
181 DCCPF_MIN_CCID_SPECIFIC = 128,
182 DCCPF_MAX_CCID_SPECIFIC = 255,
183 };
184
185 /* this structure is argument to DCCP_SOCKOPT_CHANGE_X */
186 struct dccp_so_feat {
187 __u8 dccpsf_feat;
188 __u8 *dccpsf_val;
189 __u8 dccpsf_len;
190 };
191
192 /* DCCP socket options */
193 #define DCCP_SOCKOPT_PACKET_SIZE 1
194 #define DCCP_SOCKOPT_SERVICE 2
195 #define DCCP_SOCKOPT_CHANGE_L 3
196 #define DCCP_SOCKOPT_CHANGE_R 4
197 #define DCCP_SOCKOPT_CCID_RX_INFO 128
198 #define DCCP_SOCKOPT_CCID_TX_INFO 192
199
200 #define DCCP_SERVICE_LIST_MAX_LEN 32
201
202 #ifdef __KERNEL__
203
204 #include <linux/in.h>
205 #include <linux/list.h>
206 #include <linux/uio.h>
207 #include <linux/workqueue.h>
208
209 #include <net/inet_connection_sock.h>
210 #include <net/inet_sock.h>
211 #include <net/inet_timewait_sock.h>
212 #include <net/tcp_states.h>
213
214 enum dccp_state {
215 DCCP_OPEN = TCP_ESTABLISHED,
216 DCCP_REQUESTING = TCP_SYN_SENT,
217 DCCP_PARTOPEN = TCP_FIN_WAIT1, /* FIXME:
218 This mapping is horrible, but TCP has
219 no matching state for DCCP_PARTOPEN,
220 as TCP_SYN_RECV is already used by
221 DCCP_RESPOND, why don't stop using TCP
222 mapping of states? OK, now we don't use
223 sk_stream_sendmsg anymore, so doesn't
224 seem to exist any reason for us to
225 do the TCP mapping here */
226 DCCP_LISTEN = TCP_LISTEN,
227 DCCP_RESPOND = TCP_SYN_RECV,
228 DCCP_CLOSING = TCP_CLOSING,
229 DCCP_TIME_WAIT = TCP_TIME_WAIT,
230 DCCP_CLOSED = TCP_CLOSE,
231 DCCP_MAX_STATES = TCP_MAX_STATES,
232 };
233
234 #define DCCP_STATE_MASK 0xf
235 #define DCCP_ACTION_FIN (1<<7)
236
237 enum {
238 DCCPF_OPEN = TCPF_ESTABLISHED,
239 DCCPF_REQUESTING = TCPF_SYN_SENT,
240 DCCPF_PARTOPEN = TCPF_FIN_WAIT1,
241 DCCPF_LISTEN = TCPF_LISTEN,
242 DCCPF_RESPOND = TCPF_SYN_RECV,
243 DCCPF_CLOSING = TCPF_CLOSING,
244 DCCPF_TIME_WAIT = TCPF_TIME_WAIT,
245 DCCPF_CLOSED = TCPF_CLOSE,
246 };
247
dccp_hdr(const struct sk_buff * skb)248 static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb)
249 {
250 return (struct dccp_hdr *)skb->h.raw;
251 }
252
dccp_hdrx(const struct sk_buff * skb)253 static inline struct dccp_hdr_ext *dccp_hdrx(const struct sk_buff *skb)
254 {
255 return (struct dccp_hdr_ext *)(skb->h.raw + sizeof(struct dccp_hdr));
256 }
257
__dccp_basic_hdr_len(const struct dccp_hdr * dh)258 static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh)
259 {
260 return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);
261 }
262
dccp_basic_hdr_len(const struct sk_buff * skb)263 static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)
264 {
265 const struct dccp_hdr *dh = dccp_hdr(skb);
266 return __dccp_basic_hdr_len(dh);
267 }
268
dccp_hdr_seq(const struct sk_buff * skb)269 static inline __u64 dccp_hdr_seq(const struct sk_buff *skb)
270 {
271 const struct dccp_hdr *dh = dccp_hdr(skb);
272 __u64 seq_nr = ntohs(dh->dccph_seq);
273
274 if (dh->dccph_x != 0)
275 seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(skb)->dccph_seq_low);
276 else
277 seq_nr += (u32)dh->dccph_seq2 << 16;
278
279 return seq_nr;
280 }
281
dccp_hdr_request(struct sk_buff * skb)282 static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb)
283 {
284 return (struct dccp_hdr_request *)(skb->h.raw + dccp_basic_hdr_len(skb));
285 }
286
dccp_hdr_ack_bits(const struct sk_buff * skb)287 static inline struct dccp_hdr_ack_bits *dccp_hdr_ack_bits(const struct sk_buff *skb)
288 {
289 return (struct dccp_hdr_ack_bits *)(skb->h.raw + dccp_basic_hdr_len(skb));
290 }
291
dccp_hdr_ack_seq(const struct sk_buff * skb)292 static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb)
293 {
294 const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb);
295 return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) + ntohl(dhack->dccph_ack_nr_low);
296 }
297
dccp_hdr_response(struct sk_buff * skb)298 static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb)
299 {
300 return (struct dccp_hdr_response *)(skb->h.raw + dccp_basic_hdr_len(skb));
301 }
302
dccp_hdr_reset(struct sk_buff * skb)303 static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb)
304 {
305 return (struct dccp_hdr_reset *)(skb->h.raw + dccp_basic_hdr_len(skb));
306 }
307
__dccp_hdr_len(const struct dccp_hdr * dh)308 static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh)
309 {
310 return __dccp_basic_hdr_len(dh) +
311 dccp_packet_hdr_len(dh->dccph_type);
312 }
313
dccp_hdr_len(const struct sk_buff * skb)314 static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
315 {
316 return __dccp_hdr_len(dccp_hdr(skb));
317 }
318
319
320 /* initial values for each feature */
321 #define DCCPF_INITIAL_SEQUENCE_WINDOW 100
322 #define DCCPF_INITIAL_ACK_RATIO 2
323 #define DCCPF_INITIAL_CCID 2
324 #define DCCPF_INITIAL_SEND_ACK_VECTOR 1
325 /* FIXME: for now we're default to 1 but it should really be 0 */
326 #define DCCPF_INITIAL_SEND_NDP_COUNT 1
327
328 #define DCCP_NDP_LIMIT 0xFFFFFF
329
330 /**
331 * struct dccp_minisock - Minimal DCCP connection representation
332 *
333 * Will be used to pass the state from dccp_request_sock to dccp_sock.
334 *
335 * @dccpms_sequence_window - Sequence Window Feature (section 7.5.2)
336 * @dccpms_ccid - Congestion Control Id (CCID) (section 10)
337 * @dccpms_send_ack_vector - Send Ack Vector Feature (section 11.5)
338 * @dccpms_send_ndp_count - Send NDP Count Feature (7.7.2)
339 */
340 struct dccp_minisock {
341 __u64 dccpms_sequence_window;
342 __u8 dccpms_rx_ccid;
343 __u8 dccpms_tx_ccid;
344 __u8 dccpms_send_ack_vector;
345 __u8 dccpms_send_ndp_count;
346 __u8 dccpms_ack_ratio;
347 struct list_head dccpms_pending;
348 struct list_head dccpms_conf;
349 };
350
351 struct dccp_opt_conf {
352 __u8 *dccpoc_val;
353 __u8 dccpoc_len;
354 };
355
356 struct dccp_opt_pend {
357 struct list_head dccpop_node;
358 __u8 dccpop_type;
359 __u8 dccpop_feat;
360 __u8 *dccpop_val;
361 __u8 dccpop_len;
362 int dccpop_conf;
363 struct dccp_opt_conf *dccpop_sc;
364 };
365
366 extern void __dccp_minisock_init(struct dccp_minisock *dmsk);
367 extern void dccp_minisock_init(struct dccp_minisock *dmsk);
368
369 extern int dccp_parse_options(struct sock *sk, struct sk_buff *skb);
370
371 struct dccp_request_sock {
372 struct inet_request_sock dreq_inet_rsk;
373 __u64 dreq_iss;
374 __u64 dreq_isr;
375 __be32 dreq_service;
376 };
377
dccp_rsk(const struct request_sock * req)378 static inline struct dccp_request_sock *dccp_rsk(const struct request_sock *req)
379 {
380 return (struct dccp_request_sock *)req;
381 }
382
383 extern struct inet_timewait_death_row dccp_death_row;
384
385 struct dccp_options_received {
386 u32 dccpor_ndp; /* only 24 bits */
387 u32 dccpor_timestamp;
388 u32 dccpor_timestamp_echo;
389 u32 dccpor_elapsed_time;
390 };
391
392 struct ccid;
393
394 enum dccp_role {
395 DCCP_ROLE_UNDEFINED,
396 DCCP_ROLE_LISTEN,
397 DCCP_ROLE_CLIENT,
398 DCCP_ROLE_SERVER,
399 };
400
401 struct dccp_service_list {
402 __u32 dccpsl_nr;
403 __be32 dccpsl_list[0];
404 };
405
406 #define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1)
407
dccp_list_has_service(const struct dccp_service_list * sl,const __be32 service)408 static inline int dccp_list_has_service(const struct dccp_service_list *sl,
409 const __be32 service)
410 {
411 if (likely(sl != NULL)) {
412 u32 i = sl->dccpsl_nr;
413 while (i--)
414 if (sl->dccpsl_list[i] == service)
415 return 1;
416 }
417 return 0;
418 }
419
420 struct dccp_ackvec;
421
422 /**
423 * struct dccp_sock - DCCP socket state
424 *
425 * @dccps_swl - sequence number window low
426 * @dccps_swh - sequence number window high
427 * @dccps_awl - acknowledgement number window low
428 * @dccps_awh - acknowledgement number window high
429 * @dccps_iss - initial sequence number sent
430 * @dccps_isr - initial sequence number received
431 * @dccps_osr - first OPEN sequence number received
432 * @dccps_gss - greatest sequence number sent
433 * @dccps_gsr - greatest valid sequence number received
434 * @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss
435 * @dccps_timestamp_time - time of latest TIMESTAMP option
436 * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
437 * @dccps_packet_size - Set thru setsockopt
438 * @dccps_role - Role of this sock, one of %dccp_role
439 * @dccps_ndp_count - number of Non Data Packets since last data packet
440 * @dccps_hc_rx_ackvec - rx half connection ack vector
441 */
442 struct dccp_sock {
443 /* inet_connection_sock has to be the first member of dccp_sock */
444 struct inet_connection_sock dccps_inet_connection;
445 __u64 dccps_swl;
446 __u64 dccps_swh;
447 __u64 dccps_awl;
448 __u64 dccps_awh;
449 __u64 dccps_iss;
450 __u64 dccps_isr;
451 __u64 dccps_osr;
452 __u64 dccps_gss;
453 __u64 dccps_gsr;
454 __u64 dccps_gar;
455 __be32 dccps_service;
456 struct dccp_service_list *dccps_service_list;
457 struct timeval dccps_timestamp_time;
458 __u32 dccps_timestamp_echo;
459 __u32 dccps_packet_size;
460 __u16 dccps_l_ack_ratio;
461 __u16 dccps_r_ack_ratio;
462 unsigned long dccps_ndp_count;
463 __u32 dccps_mss_cache;
464 struct dccp_minisock dccps_minisock;
465 struct dccp_ackvec *dccps_hc_rx_ackvec;
466 struct ccid *dccps_hc_rx_ccid;
467 struct ccid *dccps_hc_tx_ccid;
468 struct dccp_options_received dccps_options_received;
469 struct timeval dccps_epoch;
470 enum dccp_role dccps_role:2;
471 __u8 dccps_hc_rx_insert_options:1;
472 __u8 dccps_hc_tx_insert_options:1;
473 };
474
dccp_sk(const struct sock * sk)475 static inline struct dccp_sock *dccp_sk(const struct sock *sk)
476 {
477 return (struct dccp_sock *)sk;
478 }
479
dccp_msk(const struct sock * sk)480 static inline struct dccp_minisock *dccp_msk(const struct sock *sk)
481 {
482 return (struct dccp_minisock *)&dccp_sk(sk)->dccps_minisock;
483 }
484
dccp_service_not_initialized(const struct sock * sk)485 static inline int dccp_service_not_initialized(const struct sock *sk)
486 {
487 return dccp_sk(sk)->dccps_service == DCCP_SERVICE_INVALID_VALUE;
488 }
489
dccp_role(const struct sock * sk)490 static inline const char *dccp_role(const struct sock *sk)
491 {
492 switch (dccp_sk(sk)->dccps_role) {
493 case DCCP_ROLE_UNDEFINED: return "undefined";
494 case DCCP_ROLE_LISTEN: return "listen";
495 case DCCP_ROLE_SERVER: return "server";
496 case DCCP_ROLE_CLIENT: return "client";
497 }
498 return NULL;
499 }
500
501 #endif /* __KERNEL__ */
502
503 #endif /* _LINUX_DCCP_H */
504