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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 | |
e2e26866 | 7 | /* Structure describing an Internet (DCCP) socket address. */ |
7c657876 | 8 | struct sockaddr_dccp { |
e2e26866 ACM |
9 | __u16 sdccp_family; /* Address family */ |
10 | __u16 sdccp_port; /* Port number */ | |
11 | __u32 sdccp_addr; /* Internet address */ | |
12 | __u32 sdccp_service; /* Service */ | |
13 | /* Pad to size of `struct sockaddr': 16 bytes . */ | |
14 | __u32 sdccp_pad; | |
7c657876 ACM |
15 | }; |
16 | ||
7c657876 ACM |
17 | /** |
18 | * struct dccp_hdr - generic part of DCCP packet header | |
19 | * | |
20 | * @dccph_sport - Relevant port on the endpoint that sent this packet | |
21 | * @dccph_dport - Relevant port on the other endpoint | |
22 | * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words | |
23 | * @dccph_ccval - Used by the HC-Sender CCID | |
24 | * @dccph_cscov - Parts of the packet that are covered by the Checksum field | |
25 | * @dccph_checksum - Internet checksum, depends on dccph_cscov | |
26 | * @dccph_x - 0 = 24 bit sequence number, 1 = 48 | |
27 | * @dccph_type - packet type, see DCCP_PKT_ prefixed macros | |
28 | * @dccph_seq - sequence number high or low order 24 bits, depends on dccph_x | |
29 | */ | |
30 | struct dccp_hdr { | |
31 | __u16 dccph_sport, | |
32 | dccph_dport; | |
33 | __u8 dccph_doff; | |
34 | #if defined(__LITTLE_ENDIAN_BITFIELD) | |
35 | __u8 dccph_cscov:4, | |
36 | dccph_ccval:4; | |
37 | #elif defined(__BIG_ENDIAN_BITFIELD) | |
38 | __u8 dccph_ccval:4, | |
39 | dccph_cscov:4; | |
40 | #else | |
41 | #error "Adjust your <asm/byteorder.h> defines" | |
42 | #endif | |
43 | __u16 dccph_checksum; | |
44 | #if defined(__LITTLE_ENDIAN_BITFIELD) | |
45 | __u32 dccph_x:1, | |
46 | dccph_type:4, | |
47 | dccph_reserved:3, | |
48 | dccph_seq:24; | |
49 | #elif defined(__BIG_ENDIAN_BITFIELD) | |
50 | __u32 dccph_reserved:3, | |
51 | dccph_type:4, | |
52 | dccph_x:1, | |
53 | dccph_seq:24; | |
54 | #else | |
55 | #error "Adjust your <asm/byteorder.h> defines" | |
56 | #endif | |
57 | }; | |
58 | ||
7c657876 ACM |
59 | /** |
60 | * struct dccp_hdr_ext - the low bits of a 48 bit seq packet | |
61 | * | |
62 | * @dccph_seq_low - low 24 bits of a 48 bit seq packet | |
63 | */ | |
64 | struct dccp_hdr_ext { | |
65 | __u32 dccph_seq_low; | |
66 | }; | |
67 | ||
7c657876 ACM |
68 | /** |
69 | * struct dccp_hdr_request - Conection initiation request header | |
70 | * | |
71 | * @dccph_req_service - Service to which the client app wants to connect | |
72 | * @dccph_req_options - list of options (must be a multiple of 32 bits | |
73 | */ | |
74 | struct dccp_hdr_request { | |
75 | __u32 dccph_req_service; | |
76 | }; | |
7c657876 ACM |
77 | /** |
78 | * struct dccp_hdr_ack_bits - acknowledgment bits common to most packets | |
79 | * | |
80 | * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR | |
81 | * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR | |
82 | */ | |
83 | struct dccp_hdr_ack_bits { | |
84 | __u32 dccph_reserved1:8, | |
85 | dccph_ack_nr_high:24; | |
86 | __u32 dccph_ack_nr_low; | |
87 | }; | |
7c657876 ACM |
88 | /** |
89 | * struct dccp_hdr_response - Conection initiation response header | |
90 | * | |
91 | * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR | |
92 | * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR | |
93 | * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request | |
94 | * @dccph_resp_options - list of options (must be a multiple of 32 bits | |
95 | */ | |
96 | struct dccp_hdr_response { | |
97 | struct dccp_hdr_ack_bits dccph_resp_ack; | |
98 | __u32 dccph_resp_service; | |
99 | }; | |
100 | ||
7c657876 ACM |
101 | /** |
102 | * struct dccp_hdr_reset - Unconditionally shut down a connection | |
103 | * | |
104 | * @dccph_reset_service - Echoes the Service Code on a received DCCP-Request | |
105 | * @dccph_reset_options - list of options (must be a multiple of 32 bits | |
106 | */ | |
107 | struct dccp_hdr_reset { | |
108 | struct dccp_hdr_ack_bits dccph_reset_ack; | |
109 | __u8 dccph_reset_code, | |
110 | dccph_reset_data[3]; | |
111 | }; | |
112 | ||
7c657876 ACM |
113 | enum dccp_pkt_type { |
114 | DCCP_PKT_REQUEST = 0, | |
115 | DCCP_PKT_RESPONSE, | |
116 | DCCP_PKT_DATA, | |
117 | DCCP_PKT_ACK, | |
118 | DCCP_PKT_DATAACK, | |
119 | DCCP_PKT_CLOSEREQ, | |
120 | DCCP_PKT_CLOSE, | |
121 | DCCP_PKT_RESET, | |
122 | DCCP_PKT_SYNC, | |
123 | DCCP_PKT_SYNCACK, | |
124 | DCCP_PKT_INVALID, | |
125 | }; | |
126 | ||
127 | #define DCCP_NR_PKT_TYPES DCCP_PKT_INVALID | |
128 | ||
129 | static inline unsigned int dccp_packet_hdr_len(const __u8 type) | |
130 | { | |
131 | if (type == DCCP_PKT_DATA) | |
132 | return 0; | |
133 | if (type == DCCP_PKT_DATAACK || | |
134 | type == DCCP_PKT_ACK || | |
135 | type == DCCP_PKT_SYNC || | |
136 | type == DCCP_PKT_SYNCACK || | |
137 | type == DCCP_PKT_CLOSE || | |
138 | type == DCCP_PKT_CLOSEREQ) | |
139 | return sizeof(struct dccp_hdr_ack_bits); | |
140 | if (type == DCCP_PKT_REQUEST) | |
141 | return sizeof(struct dccp_hdr_request); | |
142 | if (type == DCCP_PKT_RESPONSE) | |
143 | return sizeof(struct dccp_hdr_response); | |
144 | return sizeof(struct dccp_hdr_reset); | |
145 | } | |
7c657876 ACM |
146 | enum dccp_reset_codes { |
147 | DCCP_RESET_CODE_UNSPECIFIED = 0, | |
148 | DCCP_RESET_CODE_CLOSED, | |
149 | DCCP_RESET_CODE_ABORTED, | |
150 | DCCP_RESET_CODE_NO_CONNECTION, | |
151 | DCCP_RESET_CODE_PACKET_ERROR, | |
152 | DCCP_RESET_CODE_OPTION_ERROR, | |
153 | DCCP_RESET_CODE_MANDATORY_ERROR, | |
154 | DCCP_RESET_CODE_CONNECTION_REFUSED, | |
155 | DCCP_RESET_CODE_BAD_SERVICE_CODE, | |
156 | DCCP_RESET_CODE_TOO_BUSY, | |
157 | DCCP_RESET_CODE_BAD_INIT_COOKIE, | |
158 | DCCP_RESET_CODE_AGGRESSION_PENALTY, | |
159 | }; | |
160 | ||
161 | /* DCCP options */ | |
162 | enum { | |
163 | DCCPO_PADDING = 0, | |
164 | DCCPO_MANDATORY = 1, | |
165 | DCCPO_MIN_RESERVED = 3, | |
166 | DCCPO_MAX_RESERVED = 31, | |
167 | DCCPO_NDP_COUNT = 37, | |
168 | DCCPO_ACK_VECTOR_0 = 38, | |
169 | DCCPO_ACK_VECTOR_1 = 39, | |
170 | DCCPO_TIMESTAMP = 41, | |
171 | DCCPO_TIMESTAMP_ECHO = 42, | |
172 | DCCPO_ELAPSED_TIME = 43, | |
173 | DCCPO_MAX = 45, | |
174 | DCCPO_MIN_CCID_SPECIFIC = 128, | |
175 | DCCPO_MAX_CCID_SPECIFIC = 255, | |
176 | }; | |
177 | ||
178 | /* DCCP features */ | |
179 | enum { | |
180 | DCCPF_RESERVED = 0, | |
181 | DCCPF_SEQUENCE_WINDOW = 3, | |
182 | DCCPF_SEND_ACK_VECTOR = 6, | |
183 | DCCPF_SEND_NDP_COUNT = 7, | |
184 | /* 10-127 reserved */ | |
185 | DCCPF_MIN_CCID_SPECIFIC = 128, | |
186 | DCCPF_MAX_CCID_SPECIFIC = 255, | |
187 | }; | |
188 | ||
5a47a470 HW |
189 | #ifdef __KERNEL__ |
190 | ||
191 | #include <linux/in.h> | |
192 | #include <linux/list.h> | |
193 | #include <linux/uio.h> | |
194 | #include <linux/workqueue.h> | |
195 | ||
196 | #include <net/inet_connection_sock.h> | |
64cf1e5d | 197 | #include <net/inet_timewait_sock.h> |
5a47a470 HW |
198 | #include <net/sock.h> |
199 | #include <net/tcp_states.h> | |
200 | #include <net/tcp.h> | |
201 | ||
202 | enum dccp_state { | |
203 | DCCP_OPEN = TCP_ESTABLISHED, | |
204 | DCCP_REQUESTING = TCP_SYN_SENT, | |
205 | DCCP_PARTOPEN = TCP_FIN_WAIT1, /* FIXME: | |
206 | This mapping is horrible, but TCP has | |
207 | no matching state for DCCP_PARTOPEN, | |
208 | as TCP_SYN_RECV is already used by | |
209 | DCCP_RESPOND, why don't stop using TCP | |
210 | mapping of states? OK, now we don't use | |
211 | sk_stream_sendmsg anymore, so doesn't | |
212 | seem to exist any reason for us to | |
213 | do the TCP mapping here */ | |
214 | DCCP_LISTEN = TCP_LISTEN, | |
215 | DCCP_RESPOND = TCP_SYN_RECV, | |
216 | DCCP_CLOSING = TCP_CLOSING, | |
217 | DCCP_TIME_WAIT = TCP_TIME_WAIT, | |
218 | DCCP_CLOSED = TCP_CLOSE, | |
219 | DCCP_MAX_STATES = TCP_MAX_STATES, | |
220 | }; | |
221 | ||
222 | #define DCCP_STATE_MASK 0xf | |
223 | #define DCCP_ACTION_FIN (1<<7) | |
224 | ||
225 | enum { | |
226 | DCCPF_OPEN = TCPF_ESTABLISHED, | |
227 | DCCPF_REQUESTING = TCPF_SYN_SENT, | |
228 | DCCPF_PARTOPEN = TCPF_FIN_WAIT1, | |
229 | DCCPF_LISTEN = TCPF_LISTEN, | |
230 | DCCPF_RESPOND = TCPF_SYN_RECV, | |
231 | DCCPF_CLOSING = TCPF_CLOSING, | |
232 | DCCPF_TIME_WAIT = TCPF_TIME_WAIT, | |
233 | DCCPF_CLOSED = TCPF_CLOSE, | |
234 | }; | |
235 | ||
236 | static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb) | |
237 | { | |
238 | return (struct dccp_hdr *)skb->h.raw; | |
239 | } | |
240 | ||
241 | static inline struct dccp_hdr_ext *dccp_hdrx(const struct sk_buff *skb) | |
242 | { | |
243 | return (struct dccp_hdr_ext *)(skb->h.raw + sizeof(struct dccp_hdr)); | |
244 | } | |
245 | ||
1d3de414 HW |
246 | static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh) |
247 | { | |
248 | return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0); | |
249 | } | |
250 | ||
5a47a470 HW |
251 | static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb) |
252 | { | |
253 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
1d3de414 | 254 | return __dccp_basic_hdr_len(dh); |
5a47a470 HW |
255 | } |
256 | ||
257 | static inline __u64 dccp_hdr_seq(const struct sk_buff *skb) | |
258 | { | |
259 | const struct dccp_hdr *dh = dccp_hdr(skb); | |
260 | #if defined(__LITTLE_ENDIAN_BITFIELD) | |
261 | __u64 seq_nr = ntohl(dh->dccph_seq << 8); | |
262 | #elif defined(__BIG_ENDIAN_BITFIELD) | |
263 | __u64 seq_nr = ntohl(dh->dccph_seq); | |
264 | #else | |
265 | #error "Adjust your <asm/byteorder.h> defines" | |
266 | #endif | |
267 | ||
268 | if (dh->dccph_x != 0) | |
269 | seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(skb)->dccph_seq_low); | |
270 | ||
271 | return seq_nr; | |
272 | } | |
273 | ||
274 | static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb) | |
275 | { | |
276 | return (struct dccp_hdr_request *)(skb->h.raw + dccp_basic_hdr_len(skb)); | |
277 | } | |
278 | ||
279 | static inline struct dccp_hdr_ack_bits *dccp_hdr_ack_bits(const struct sk_buff *skb) | |
280 | { | |
281 | return (struct dccp_hdr_ack_bits *)(skb->h.raw + dccp_basic_hdr_len(skb)); | |
282 | } | |
283 | ||
284 | static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb) | |
285 | { | |
286 | const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb); | |
287 | #if defined(__LITTLE_ENDIAN_BITFIELD) | |
288 | return (((u64)ntohl(dhack->dccph_ack_nr_high << 8)) << 32) + ntohl(dhack->dccph_ack_nr_low); | |
289 | #elif defined(__BIG_ENDIAN_BITFIELD) | |
290 | return (((u64)ntohl(dhack->dccph_ack_nr_high)) << 32) + ntohl(dhack->dccph_ack_nr_low); | |
291 | #else | |
292 | #error "Adjust your <asm/byteorder.h> defines" | |
293 | #endif | |
294 | } | |
295 | ||
296 | static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb) | |
297 | { | |
298 | return (struct dccp_hdr_response *)(skb->h.raw + dccp_basic_hdr_len(skb)); | |
299 | } | |
300 | ||
301 | static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb) | |
302 | { | |
303 | return (struct dccp_hdr_reset *)(skb->h.raw + dccp_basic_hdr_len(skb)); | |
304 | } | |
305 | ||
1d3de414 HW |
306 | static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh) |
307 | { | |
308 | return __dccp_basic_hdr_len(dh) + | |
309 | dccp_packet_hdr_len(dh->dccph_type); | |
310 | } | |
311 | ||
5a47a470 HW |
312 | static inline unsigned int dccp_hdr_len(const struct sk_buff *skb) |
313 | { | |
1d3de414 | 314 | return __dccp_hdr_len(dccp_hdr(skb)); |
5a47a470 HW |
315 | } |
316 | ||
317 | ||
7c657876 ACM |
318 | /* initial values for each feature */ |
319 | #define DCCPF_INITIAL_SEQUENCE_WINDOW 100 | |
320 | /* FIXME: for now we're using CCID 3 (TFRC) */ | |
321 | #define DCCPF_INITIAL_CCID 3 | |
322 | #define DCCPF_INITIAL_SEND_ACK_VECTOR 0 | |
323 | /* FIXME: for now we're default to 1 but it should really be 0 */ | |
324 | #define DCCPF_INITIAL_SEND_NDP_COUNT 1 | |
325 | ||
326 | #define DCCP_NDP_LIMIT 0xFFFFFF | |
327 | ||
328 | /** | |
329 | * struct dccp_options - option values for a DCCP connection | |
330 | * @dccpo_sequence_window - Sequence Window Feature (section 7.5.2) | |
331 | * @dccpo_ccid - Congestion Control Id (CCID) (section 10) | |
332 | * @dccpo_send_ack_vector - Send Ack Vector Feature (section 11.5) | |
333 | * @dccpo_send_ndp_count - Send NDP Count Feature (7.7.2) | |
334 | */ | |
335 | struct dccp_options { | |
336 | __u64 dccpo_sequence_window; | |
337 | __u8 dccpo_ccid; | |
338 | __u8 dccpo_send_ack_vector; | |
339 | __u8 dccpo_send_ndp_count; | |
340 | }; | |
341 | ||
342 | extern void __dccp_options_init(struct dccp_options *dccpo); | |
343 | extern void dccp_options_init(struct dccp_options *dccpo); | |
344 | extern int dccp_parse_options(struct sock *sk, struct sk_buff *skb); | |
345 | ||
346 | struct dccp_request_sock { | |
347 | struct inet_request_sock dreq_inet_rsk; | |
348 | __u64 dreq_iss; | |
349 | __u64 dreq_isr; | |
350 | __u32 dreq_service; | |
351 | }; | |
352 | ||
353 | static inline struct dccp_request_sock *dccp_rsk(const struct request_sock *req) | |
354 | { | |
355 | return (struct dccp_request_sock *)req; | |
356 | } | |
357 | ||
64cf1e5d ACM |
358 | extern struct inet_timewait_death_row dccp_death_row; |
359 | ||
7c657876 ACM |
360 | /* Read about the ECN nonce to see why it is 253 */ |
361 | #define DCCP_MAX_ACK_VECTOR_LEN 253 | |
362 | ||
363 | struct dccp_options_received { | |
364 | u32 dccpor_ndp:24, | |
365 | dccpor_ack_vector_len:8; | |
366 | u32 dccpor_ack_vector_idx:10; | |
367 | /* 22 bits hole, try to pack */ | |
368 | u32 dccpor_timestamp; | |
369 | u32 dccpor_timestamp_echo; | |
370 | u32 dccpor_elapsed_time; | |
371 | }; | |
372 | ||
373 | struct ccid; | |
374 | ||
375 | enum dccp_role { | |
376 | DCCP_ROLE_UNDEFINED, | |
377 | DCCP_ROLE_LISTEN, | |
378 | DCCP_ROLE_CLIENT, | |
379 | DCCP_ROLE_SERVER, | |
380 | }; | |
381 | ||
382 | /** | |
383 | * struct dccp_sock - DCCP socket state | |
384 | * | |
385 | * @dccps_swl - sequence number window low | |
386 | * @dccps_swh - sequence number window high | |
387 | * @dccps_awl - acknowledgement number window low | |
388 | * @dccps_awh - acknowledgement number window high | |
389 | * @dccps_iss - initial sequence number sent | |
390 | * @dccps_isr - initial sequence number received | |
391 | * @dccps_osr - first OPEN sequence number received | |
392 | * @dccps_gss - greatest sequence number sent | |
393 | * @dccps_gsr - greatest valid sequence number received | |
394 | * @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss | |
395 | * @dccps_timestamp_time - time of latest TIMESTAMP option | |
396 | * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option | |
397 | * @dccps_ext_header_len - network protocol overhead (IP/IPv6 options) | |
398 | * @dccps_pmtu_cookie - Last pmtu seen by socket | |
399 | * @dccps_avg_packet_size - FIXME: has to be set by the app thru some setsockopt or ioctl, CCID3 uses it | |
400 | * @dccps_role - Role of this sock, one of %dccp_role | |
401 | * @dccps_ndp_count - number of Non Data Packets since last data packet | |
402 | * @dccps_hc_rx_ackpkts - receiver half connection acked packets | |
403 | */ | |
404 | struct dccp_sock { | |
405 | /* inet_connection_sock has to be the first member of dccp_sock */ | |
406 | struct inet_connection_sock dccps_inet_connection; | |
407 | __u64 dccps_swl; | |
408 | __u64 dccps_swh; | |
409 | __u64 dccps_awl; | |
410 | __u64 dccps_awh; | |
411 | __u64 dccps_iss; | |
412 | __u64 dccps_isr; | |
413 | __u64 dccps_osr; | |
414 | __u64 dccps_gss; | |
415 | __u64 dccps_gsr; | |
416 | __u64 dccps_gar; | |
417 | unsigned long dccps_service; | |
418 | unsigned long dccps_timestamp_time; | |
419 | __u32 dccps_timestamp_echo; | |
420 | __u32 dccps_avg_packet_size; | |
421 | unsigned long dccps_ndp_count; | |
422 | __u16 dccps_ext_header_len; | |
423 | __u32 dccps_pmtu_cookie; | |
424 | __u32 dccps_mss_cache; | |
425 | struct dccp_options dccps_options; | |
426 | struct dccp_ackpkts *dccps_hc_rx_ackpkts; | |
427 | void *dccps_hc_rx_ccid_private; | |
428 | void *dccps_hc_tx_ccid_private; | |
429 | struct ccid *dccps_hc_rx_ccid; | |
430 | struct ccid *dccps_hc_tx_ccid; | |
431 | struct dccp_options_received dccps_options_received; | |
432 | enum dccp_role dccps_role:2; | |
433 | }; | |
434 | ||
435 | static inline struct dccp_sock *dccp_sk(const struct sock *sk) | |
436 | { | |
437 | return (struct dccp_sock *)sk; | |
438 | } | |
439 | ||
440 | static inline const char *dccp_role(const struct sock *sk) | |
441 | { | |
442 | switch (dccp_sk(sk)->dccps_role) { | |
443 | case DCCP_ROLE_UNDEFINED: return "undefined"; | |
444 | case DCCP_ROLE_LISTEN: return "listen"; | |
445 | case DCCP_ROLE_SERVER: return "server"; | |
446 | case DCCP_ROLE_CLIENT: return "client"; | |
447 | } | |
448 | return NULL; | |
449 | } | |
450 | ||
5a47a470 HW |
451 | #endif /* __KERNEL__ */ |
452 | ||
7c657876 | 453 | #endif /* _LINUX_DCCP_H */ |