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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 { | |
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 | ||
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 { | |
55 | __u32 dccph_seq_low; | |
56 | }; | |
57 | ||
7c657876 ACM |
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 | }; | |
7c657876 ACM |
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 | }; | |
7c657876 ACM |
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 | ||
7c657876 ACM |
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 | ||
7c657876 ACM |
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 | } | |
7c657876 ACM |
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 | ||
a84ffe43 ACM |
179 | /* DCCP socket options */ |
180 | #define DCCP_SOCKOPT_PACKET_SIZE 1 | |
67e6b629 | 181 | #define DCCP_SOCKOPT_SERVICE 2 |
88f964db ACM |
182 | #define DCCP_SOCKOPT_CCID_RX_INFO 128 |
183 | #define DCCP_SOCKOPT_CCID_TX_INFO 192 | |
67e6b629 ACM |
184 | |
185 | #define DCCP_SERVICE_LIST_MAX_LEN 32 | |
a84ffe43 | 186 | |
5a47a470 HW |
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> | |
14c85021 | 195 | #include <net/inet_sock.h> |
64cf1e5d | 196 | #include <net/inet_timewait_sock.h> |
5a47a470 | 197 | #include <net/tcp_states.h> |
5a47a470 HW |
198 | |
199 | enum dccp_state { | |
200 | DCCP_OPEN = TCP_ESTABLISHED, | |
201 | DCCP_REQUESTING = TCP_SYN_SENT, | |
202 | DCCP_PARTOPEN = TCP_FIN_WAIT1, /* FIXME: | |
203 | This mapping is horrible, but TCP has | |
204 | no matching state for DCCP_PARTOPEN, | |
205 | as TCP_SYN_RECV is already used by | |
206 | DCCP_RESPOND, why don't stop using TCP | |
207 | mapping of states? OK, now we don't use | |
208 | sk_stream_sendmsg anymore, so doesn't | |
209 | seem to exist any reason for us to | |
210 | do the TCP mapping here */ | |
211 | DCCP_LISTEN = TCP_LISTEN, | |
212 | DCCP_RESPOND = TCP_SYN_RECV, | |
213 | DCCP_CLOSING = TCP_CLOSING, | |
214 | DCCP_TIME_WAIT = TCP_TIME_WAIT, | |
215 | DCCP_CLOSED = TCP_CLOSE, | |
216 | DCCP_MAX_STATES = TCP_MAX_STATES, | |
217 | }; | |
218 | ||
219 | #define DCCP_STATE_MASK 0xf | |
220 | #define DCCP_ACTION_FIN (1<<7) | |
221 | ||
222 | enum { | |
223 | DCCPF_OPEN = TCPF_ESTABLISHED, | |
224 | DCCPF_REQUESTING = TCPF_SYN_SENT, | |
225 | DCCPF_PARTOPEN = TCPF_FIN_WAIT1, | |
226 | DCCPF_LISTEN = TCPF_LISTEN, | |
227 | DCCPF_RESPOND = TCPF_SYN_RECV, | |
228 | DCCPF_CLOSING = TCPF_CLOSING, | |
229 | DCCPF_TIME_WAIT = TCPF_TIME_WAIT, | |
230 | DCCPF_CLOSED = TCPF_CLOSE, | |
231 | }; | |
232 | ||
233 | static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb) | |
234 | { | |
235 | return (struct dccp_hdr *)skb->h.raw; | |
236 | } | |
237 | ||
238 | static inline struct dccp_hdr_ext *dccp_hdrx(const struct sk_buff *skb) | |
239 | { | |
240 | return (struct dccp_hdr_ext *)(skb->h.raw + sizeof(struct dccp_hdr)); | |
241 | } | |
242 | ||
1d3de414 HW |
243 | static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh) |
244 | { | |
245 | return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0); | |
246 | } | |
247 | ||
5a47a470 HW |
248 | static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb) |
249 | { | |
250 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
1d3de414 | 251 | return __dccp_basic_hdr_len(dh); |
5a47a470 HW |
252 | } |
253 | ||
254 | static inline __u64 dccp_hdr_seq(const struct sk_buff *skb) | |
255 | { | |
256 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
257 | #if defined(__LITTLE_ENDIAN_BITFIELD) | |
258 | __u64 seq_nr = ntohl(dh->dccph_seq << 8); | |
259 | #elif defined(__BIG_ENDIAN_BITFIELD) | |
260 | __u64 seq_nr = ntohl(dh->dccph_seq); | |
261 | #else | |
262 | #error "Adjust your <asm/byteorder.h> defines" | |
263 | #endif | |
264 | ||
265 | if (dh->dccph_x != 0) | |
266 | seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(skb)->dccph_seq_low); | |
267 | ||
268 | return seq_nr; | |
269 | } | |
270 | ||
271 | static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb) | |
272 | { | |
273 | return (struct dccp_hdr_request *)(skb->h.raw + dccp_basic_hdr_len(skb)); | |
274 | } | |
275 | ||
276 | static inline struct dccp_hdr_ack_bits *dccp_hdr_ack_bits(const struct sk_buff *skb) | |
277 | { | |
278 | return (struct dccp_hdr_ack_bits *)(skb->h.raw + dccp_basic_hdr_len(skb)); | |
279 | } | |
280 | ||
281 | static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb) | |
282 | { | |
283 | const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb); | |
284 | #if defined(__LITTLE_ENDIAN_BITFIELD) | |
285 | return (((u64)ntohl(dhack->dccph_ack_nr_high << 8)) << 32) + ntohl(dhack->dccph_ack_nr_low); | |
286 | #elif defined(__BIG_ENDIAN_BITFIELD) | |
287 | return (((u64)ntohl(dhack->dccph_ack_nr_high)) << 32) + ntohl(dhack->dccph_ack_nr_low); | |
288 | #else | |
289 | #error "Adjust your <asm/byteorder.h> defines" | |
290 | #endif | |
291 | } | |
292 | ||
293 | static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb) | |
294 | { | |
295 | return (struct dccp_hdr_response *)(skb->h.raw + dccp_basic_hdr_len(skb)); | |
296 | } | |
297 | ||
298 | static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb) | |
299 | { | |
300 | return (struct dccp_hdr_reset *)(skb->h.raw + dccp_basic_hdr_len(skb)); | |
301 | } | |
302 | ||
1d3de414 HW |
303 | static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh) |
304 | { | |
305 | return __dccp_basic_hdr_len(dh) + | |
306 | dccp_packet_hdr_len(dh->dccph_type); | |
307 | } | |
308 | ||
5a47a470 HW |
309 | static inline unsigned int dccp_hdr_len(const struct sk_buff *skb) |
310 | { | |
1d3de414 | 311 | return __dccp_hdr_len(dccp_hdr(skb)); |
5a47a470 HW |
312 | } |
313 | ||
314 | ||
7c657876 ACM |
315 | /* initial values for each feature */ |
316 | #define DCCPF_INITIAL_SEQUENCE_WINDOW 100 | |
317 | /* FIXME: for now we're using CCID 3 (TFRC) */ | |
318 | #define DCCPF_INITIAL_CCID 3 | |
319 | #define DCCPF_INITIAL_SEND_ACK_VECTOR 0 | |
320 | /* FIXME: for now we're default to 1 but it should really be 0 */ | |
321 | #define DCCPF_INITIAL_SEND_NDP_COUNT 1 | |
322 | ||
323 | #define DCCP_NDP_LIMIT 0xFFFFFF | |
324 | ||
325 | /** | |
326 | * struct dccp_options - option values for a DCCP connection | |
327 | * @dccpo_sequence_window - Sequence Window Feature (section 7.5.2) | |
328 | * @dccpo_ccid - Congestion Control Id (CCID) (section 10) | |
329 | * @dccpo_send_ack_vector - Send Ack Vector Feature (section 11.5) | |
330 | * @dccpo_send_ndp_count - Send NDP Count Feature (7.7.2) | |
331 | */ | |
332 | struct dccp_options { | |
333 | __u64 dccpo_sequence_window; | |
561713cf ACM |
334 | __u8 dccpo_rx_ccid; |
335 | __u8 dccpo_tx_ccid; | |
7c657876 ACM |
336 | __u8 dccpo_send_ack_vector; |
337 | __u8 dccpo_send_ndp_count; | |
338 | }; | |
339 | ||
340 | extern void __dccp_options_init(struct dccp_options *dccpo); | |
341 | extern void dccp_options_init(struct dccp_options *dccpo); | |
342 | extern int dccp_parse_options(struct sock *sk, struct sk_buff *skb); | |
343 | ||
344 | struct dccp_request_sock { | |
345 | struct inet_request_sock dreq_inet_rsk; | |
346 | __u64 dreq_iss; | |
347 | __u64 dreq_isr; | |
348 | __u32 dreq_service; | |
349 | }; | |
350 | ||
351 | static inline struct dccp_request_sock *dccp_rsk(const struct request_sock *req) | |
352 | { | |
353 | return (struct dccp_request_sock *)req; | |
354 | } | |
355 | ||
64cf1e5d ACM |
356 | extern struct inet_timewait_death_row dccp_death_row; |
357 | ||
7c657876 | 358 | struct dccp_options_received { |
ae31c339 | 359 | u32 dccpor_ndp; /* only 24 bits */ |
7c657876 ACM |
360 | u32 dccpor_timestamp; |
361 | u32 dccpor_timestamp_echo; | |
362 | u32 dccpor_elapsed_time; | |
363 | }; | |
364 | ||
365 | struct ccid; | |
366 | ||
367 | enum dccp_role { | |
368 | DCCP_ROLE_UNDEFINED, | |
369 | DCCP_ROLE_LISTEN, | |
370 | DCCP_ROLE_CLIENT, | |
371 | DCCP_ROLE_SERVER, | |
372 | }; | |
373 | ||
67e6b629 ACM |
374 | struct dccp_service_list { |
375 | __u32 dccpsl_nr; | |
376 | __u32 dccpsl_list[0]; | |
377 | }; | |
378 | ||
379 | #define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1) | |
380 | ||
381 | static inline int dccp_list_has_service(const struct dccp_service_list *sl, | |
382 | const u32 service) | |
383 | { | |
384 | if (likely(sl != NULL)) { | |
385 | u32 i = sl->dccpsl_nr; | |
386 | while (i--) | |
387 | if (sl->dccpsl_list[i] == service) | |
388 | return 1; | |
389 | } | |
390 | return 0; | |
391 | } | |
392 | ||
ae31c339 ACM |
393 | struct dccp_ackvec; |
394 | ||
7c657876 ACM |
395 | /** |
396 | * struct dccp_sock - DCCP socket state | |
397 | * | |
398 | * @dccps_swl - sequence number window low | |
399 | * @dccps_swh - sequence number window high | |
400 | * @dccps_awl - acknowledgement number window low | |
401 | * @dccps_awh - acknowledgement number window high | |
402 | * @dccps_iss - initial sequence number sent | |
403 | * @dccps_isr - initial sequence number received | |
404 | * @dccps_osr - first OPEN sequence number received | |
405 | * @dccps_gss - greatest sequence number sent | |
406 | * @dccps_gsr - greatest valid sequence number received | |
407 | * @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss | |
408 | * @dccps_timestamp_time - time of latest TIMESTAMP option | |
409 | * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option | |
a84ffe43 | 410 | * @dccps_packet_size - Set thru setsockopt |
7c657876 ACM |
411 | * @dccps_role - Role of this sock, one of %dccp_role |
412 | * @dccps_ndp_count - number of Non Data Packets since last data packet | |
ae31c339 | 413 | * @dccps_hc_rx_ackvec - rx half connection ack vector |
7c657876 ACM |
414 | */ |
415 | struct dccp_sock { | |
416 | /* inet_connection_sock has to be the first member of dccp_sock */ | |
417 | struct inet_connection_sock dccps_inet_connection; | |
418 | __u64 dccps_swl; | |
419 | __u64 dccps_swh; | |
420 | __u64 dccps_awl; | |
421 | __u64 dccps_awh; | |
422 | __u64 dccps_iss; | |
423 | __u64 dccps_isr; | |
424 | __u64 dccps_osr; | |
425 | __u64 dccps_gss; | |
426 | __u64 dccps_gsr; | |
427 | __u64 dccps_gar; | |
67e6b629 ACM |
428 | __u32 dccps_service; |
429 | struct dccp_service_list *dccps_service_list; | |
1bc09869 | 430 | struct timeval dccps_timestamp_time; |
7c657876 | 431 | __u32 dccps_timestamp_echo; |
a84ffe43 | 432 | __u32 dccps_packet_size; |
7c657876 | 433 | unsigned long dccps_ndp_count; |
7c657876 ACM |
434 | __u32 dccps_mss_cache; |
435 | struct dccp_options dccps_options; | |
ae31c339 | 436 | struct dccp_ackvec *dccps_hc_rx_ackvec; |
7c657876 ACM |
437 | void *dccps_hc_rx_ccid_private; |
438 | void *dccps_hc_tx_ccid_private; | |
439 | struct ccid *dccps_hc_rx_ccid; | |
440 | struct ccid *dccps_hc_tx_ccid; | |
441 | struct dccp_options_received dccps_options_received; | |
b0e56780 | 442 | struct timeval dccps_epoch; |
7c657876 | 443 | enum dccp_role dccps_role:2; |
507d37cf ACM |
444 | __u8 dccps_hc_rx_insert_options:1; |
445 | __u8 dccps_hc_tx_insert_options:1; | |
7c657876 ACM |
446 | }; |
447 | ||
448 | static inline struct dccp_sock *dccp_sk(const struct sock *sk) | |
449 | { | |
450 | return (struct dccp_sock *)sk; | |
451 | } | |
452 | ||
67e6b629 ACM |
453 | static inline int dccp_service_not_initialized(const struct sock *sk) |
454 | { | |
455 | return dccp_sk(sk)->dccps_service == DCCP_SERVICE_INVALID_VALUE; | |
456 | } | |
457 | ||
7c657876 ACM |
458 | static inline const char *dccp_role(const struct sock *sk) |
459 | { | |
460 | switch (dccp_sk(sk)->dccps_role) { | |
461 | case DCCP_ROLE_UNDEFINED: return "undefined"; | |
462 | case DCCP_ROLE_LISTEN: return "listen"; | |
463 | case DCCP_ROLE_SERVER: return "server"; | |
464 | case DCCP_ROLE_CLIENT: return "client"; | |
465 | } | |
466 | return NULL; | |
467 | } | |
468 | ||
5a47a470 HW |
469 | #endif /* __KERNEL__ */ |
470 | ||
7c657876 | 471 | #endif /* _LINUX_DCCP_H */ |