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Linux v2.6.15-rc7
[pohmelfs.git] / include / linux / dccp.h
blob71fab4311e92624ff985793df2d9c14777b7e46c
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 __u16 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 __u32 dccph_x:1,
36 dccph_type:4,
37 dccph_reserved:3,
38 dccph_seq:24;
39 #elif defined(__BIG_ENDIAN_BITFIELD)
40 __u32 dccph_reserved:3,
41 dccph_type:4,
42 dccph_x:1,
43 dccph_seq:24;
44 #else
45 #error "Adjust your <asm/byteorder.h> defines"
46 #endif
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 __u32 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 __u32 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 __u32 dccph_reserved1:8,
75 dccph_ack_nr_high:24;
76 __u32 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 __u32 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
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_NDP_COUNT = 37,
158 DCCPO_ACK_VECTOR_0 = 38,
159 DCCPO_ACK_VECTOR_1 = 39,
160 DCCPO_TIMESTAMP = 41,
161 DCCPO_TIMESTAMP_ECHO = 42,
162 DCCPO_ELAPSED_TIME = 43,
163 DCCPO_MAX = 45,
164 DCCPO_MIN_CCID_SPECIFIC = 128,
165 DCCPO_MAX_CCID_SPECIFIC = 255,
166 };
167
168 /* DCCP features */
169 enum {
170 DCCPF_RESERVED = 0,
171 DCCPF_SEQUENCE_WINDOW = 3,
172 DCCPF_SEND_ACK_VECTOR = 6,
173 DCCPF_SEND_NDP_COUNT = 7,
174 /* 10-127 reserved */
175 DCCPF_MIN_CCID_SPECIFIC = 128,
176 DCCPF_MAX_CCID_SPECIFIC = 255,
177 };
178
179 /* DCCP socket options */
180 #define DCCP_SOCKOPT_PACKET_SIZE 1
181 #define DCCP_SOCKOPT_SERVICE 2
182 #define DCCP_SOCKOPT_CCID_RX_INFO 128
183 #define DCCP_SOCKOPT_CCID_TX_INFO 192
184
185 #define DCCP_SERVICE_LIST_MAX_LEN 32
186
187 #ifdef __KERNEL__
188
189 #include <linux/in.h>
190 #include <linux/list.h>
191 #include <linux/uio.h>
192 #include <linux/workqueue.h>
193
194 #include <net/inet_connection_sock.h>
195 #include <net/inet_timewait_sock.h>
196 #include <net/sock.h>
197 #include <net/tcp_states.h>
198 #include <net/tcp.h>
199
200 enum dccp_state {
201 DCCP_OPEN = TCP_ESTABLISHED,
202 DCCP_REQUESTING = TCP_SYN_SENT,
203 DCCP_PARTOPEN = TCP_FIN_WAIT1, /* FIXME:
204 This mapping is horrible, but TCP has
205 no matching state for DCCP_PARTOPEN,
206 as TCP_SYN_RECV is already used by
207 DCCP_RESPOND, why don't stop using TCP
208 mapping of states? OK, now we don't use
209 sk_stream_sendmsg anymore, so doesn't
210 seem to exist any reason for us to
211 do the TCP mapping here */
212 DCCP_LISTEN = TCP_LISTEN,
213 DCCP_RESPOND = TCP_SYN_RECV,
214 DCCP_CLOSING = TCP_CLOSING,
215 DCCP_TIME_WAIT = TCP_TIME_WAIT,
216 DCCP_CLOSED = TCP_CLOSE,
217 DCCP_MAX_STATES = TCP_MAX_STATES,
218 };
219
220 #define DCCP_STATE_MASK 0xf
221 #define DCCP_ACTION_FIN (1<<7)
222
223 enum {
224 DCCPF_OPEN = TCPF_ESTABLISHED,
225 DCCPF_REQUESTING = TCPF_SYN_SENT,
226 DCCPF_PARTOPEN = TCPF_FIN_WAIT1,
227 DCCPF_LISTEN = TCPF_LISTEN,
228 DCCPF_RESPOND = TCPF_SYN_RECV,
229 DCCPF_CLOSING = TCPF_CLOSING,
230 DCCPF_TIME_WAIT = TCPF_TIME_WAIT,
231 DCCPF_CLOSED = TCPF_CLOSE,
232 };
233
234 static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb)
235 {
236 return (struct dccp_hdr *)skb->h.raw;
237 }
238
239 static inline struct dccp_hdr_ext *dccp_hdrx(const struct sk_buff *skb)
240 {
241 return (struct dccp_hdr_ext *)(skb->h.raw + sizeof(struct dccp_hdr));
242 }
243
244 static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh)
245 {
246 return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);
247 }
248
249 static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)
250 {
251 const struct dccp_hdr *dh = dccp_hdr(skb);
252 return __dccp_basic_hdr_len(dh);
253 }
254
255 static inline __u64 dccp_hdr_seq(const struct sk_buff *skb)
256 {
257 const struct dccp_hdr *dh = dccp_hdr(skb);
258 #if defined(__LITTLE_ENDIAN_BITFIELD)
259 __u64 seq_nr = ntohl(dh->dccph_seq << 8);
260 #elif defined(__BIG_ENDIAN_BITFIELD)
261 __u64 seq_nr = ntohl(dh->dccph_seq);
262 #else
263 #error "Adjust your <asm/byteorder.h> defines"
264 #endif
265
266 if (dh->dccph_x != 0)
267 seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(skb)->dccph_seq_low);
268
269 return seq_nr;
270 }
271
272 static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb)
273 {
274 return (struct dccp_hdr_request *)(skb->h.raw + dccp_basic_hdr_len(skb));
275 }
276
277 static inline struct dccp_hdr_ack_bits *dccp_hdr_ack_bits(const struct sk_buff *skb)
278 {
279 return (struct dccp_hdr_ack_bits *)(skb->h.raw + dccp_basic_hdr_len(skb));
280 }
281
282 static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb)
283 {
284 const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb);
285 #if defined(__LITTLE_ENDIAN_BITFIELD)
286 return (((u64)ntohl(dhack->dccph_ack_nr_high << 8)) << 32) + ntohl(dhack->dccph_ack_nr_low);
287 #elif defined(__BIG_ENDIAN_BITFIELD)
288 return (((u64)ntohl(dhack->dccph_ack_nr_high)) << 32) + ntohl(dhack->dccph_ack_nr_low);
289 #else
290 #error "Adjust your <asm/byteorder.h> defines"
291 #endif
292 }
293
294 static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb)
295 {
296 return (struct dccp_hdr_response *)(skb->h.raw + dccp_basic_hdr_len(skb));
297 }
298
299 static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb)
300 {
301 return (struct dccp_hdr_reset *)(skb->h.raw + dccp_basic_hdr_len(skb));
302 }
303
304 static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh)
305 {
306 return __dccp_basic_hdr_len(dh) +
307 dccp_packet_hdr_len(dh->dccph_type);
308 }
309
310 static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
311 {
312 return __dccp_hdr_len(dccp_hdr(skb));
313 }
314
315
316 /* initial values for each feature */
317 #define DCCPF_INITIAL_SEQUENCE_WINDOW 100
318 /* FIXME: for now we're using CCID 3 (TFRC) */
319 #define DCCPF_INITIAL_CCID 3
320 #define DCCPF_INITIAL_SEND_ACK_VECTOR 0
321 /* FIXME: for now we're default to 1 but it should really be 0 */
322 #define DCCPF_INITIAL_SEND_NDP_COUNT 1
323
324 #define DCCP_NDP_LIMIT 0xFFFFFF
325
326 /**
327 * struct dccp_options - option values for a DCCP connection
328 * @dccpo_sequence_window - Sequence Window Feature (section 7.5.2)
329 * @dccpo_ccid - Congestion Control Id (CCID) (section 10)
330 * @dccpo_send_ack_vector - Send Ack Vector Feature (section 11.5)
331 * @dccpo_send_ndp_count - Send NDP Count Feature (7.7.2)
332 */
333 struct dccp_options {
334 __u64 dccpo_sequence_window;
335 __u8 dccpo_rx_ccid;
336 __u8 dccpo_tx_ccid;
337 __u8 dccpo_send_ack_vector;
338 __u8 dccpo_send_ndp_count;
339 };
340
341 extern void __dccp_options_init(struct dccp_options *dccpo);
342 extern void dccp_options_init(struct dccp_options *dccpo);
343 extern int dccp_parse_options(struct sock *sk, struct sk_buff *skb);
344
345 struct dccp_request_sock {
346 struct inet_request_sock dreq_inet_rsk;
347 __u64 dreq_iss;
348 __u64 dreq_isr;
349 __u32 dreq_service;
350 };
351
352 static inline struct dccp_request_sock *dccp_rsk(const struct request_sock *req)
353 {
354 return (struct dccp_request_sock *)req;
355 }
356
357 extern struct inet_timewait_death_row dccp_death_row;
358
359 struct dccp_options_received {
360 u32 dccpor_ndp; /* only 24 bits */
361 u32 dccpor_timestamp;
362 u32 dccpor_timestamp_echo;
363 u32 dccpor_elapsed_time;
364 };
365
366 struct ccid;
367
368 enum dccp_role {
369 DCCP_ROLE_UNDEFINED,
370 DCCP_ROLE_LISTEN,
371 DCCP_ROLE_CLIENT,
372 DCCP_ROLE_SERVER,
373 };
374
375 struct dccp_service_list {
376 __u32 dccpsl_nr;
377 __u32 dccpsl_list[0];
378 };
379
380 #define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1)
381
382 static inline int dccp_list_has_service(const struct dccp_service_list *sl,
383 const u32 service)
384 {
385 if (likely(sl != NULL)) {
386 u32 i = sl->dccpsl_nr;
387 while (i--)
388 if (sl->dccpsl_list[i] == service)
389 return 1;
390 }
391 return 0;
392 }
393
394 struct dccp_ackvec;
395
396 /**
397 * struct dccp_sock - DCCP socket state
398 *
399 * @dccps_swl - sequence number window low
400 * @dccps_swh - sequence number window high
401 * @dccps_awl - acknowledgement number window low
402 * @dccps_awh - acknowledgement number window high
403 * @dccps_iss - initial sequence number sent
404 * @dccps_isr - initial sequence number received
405 * @dccps_osr - first OPEN sequence number received
406 * @dccps_gss - greatest sequence number sent
407 * @dccps_gsr - greatest valid sequence number received
408 * @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss
409 * @dccps_timestamp_time - time of latest TIMESTAMP option
410 * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
411 * @dccps_ext_header_len - network protocol overhead (IP/IPv6 options)
412 * @dccps_pmtu_cookie - Last pmtu seen by socket
413 * @dccps_packet_size - Set thru setsockopt
414 * @dccps_role - Role of this sock, one of %dccp_role
415 * @dccps_ndp_count - number of Non Data Packets since last data packet
416 * @dccps_hc_rx_ackvec - rx half connection ack vector
417 */
418 struct dccp_sock {
419 /* inet_connection_sock has to be the first member of dccp_sock */
420 struct inet_connection_sock dccps_inet_connection;
421 __u64 dccps_swl;
422 __u64 dccps_swh;
423 __u64 dccps_awl;
424 __u64 dccps_awh;
425 __u64 dccps_iss;
426 __u64 dccps_isr;
427 __u64 dccps_osr;
428 __u64 dccps_gss;
429 __u64 dccps_gsr;
430 __u64 dccps_gar;
431 __u32 dccps_service;
432 struct dccp_service_list *dccps_service_list;
433 struct timeval dccps_timestamp_time;
434 __u32 dccps_timestamp_echo;
435 __u32 dccps_packet_size;
436 unsigned long dccps_ndp_count;
437 __u16 dccps_ext_header_len;
438 __u32 dccps_pmtu_cookie;
439 __u32 dccps_mss_cache;
440 struct dccp_options dccps_options;
441 struct dccp_ackvec *dccps_hc_rx_ackvec;
442 void *dccps_hc_rx_ccid_private;
443 void *dccps_hc_tx_ccid_private;
444 struct ccid *dccps_hc_rx_ccid;
445 struct ccid *dccps_hc_tx_ccid;
446 struct dccp_options_received dccps_options_received;
447 struct timeval dccps_epoch;
448 enum dccp_role dccps_role:2;
449 __u8 dccps_hc_rx_insert_options:1;
450 __u8 dccps_hc_tx_insert_options:1;
451 };
452
453 static inline struct dccp_sock *dccp_sk(const struct sock *sk)
454 {
455 return (struct dccp_sock *)sk;
456 }
457
458 static inline int dccp_service_not_initialized(const struct sock *sk)
459 {
460 return dccp_sk(sk)->dccps_service == DCCP_SERVICE_INVALID_VALUE;
461 }
462
463 static inline const char *dccp_role(const struct sock *sk)
464 {
465 switch (dccp_sk(sk)->dccps_role) {
466 case DCCP_ROLE_UNDEFINED: return "undefined";
467 case DCCP_ROLE_LISTEN: return "listen";
468 case DCCP_ROLE_SERVER: return "server";
469 case DCCP_ROLE_CLIENT: return "client";
470 }
471 return NULL;
472 }
473
474 #endif /* __KERNEL__ */
475
476 #endif /* _LINUX_DCCP_H */