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Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001#ifndef _LINUX_DCCP_H
2#define _LINUX_DCCP_H
3
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07004#include <linux/types.h>
Harald Welte5a47a472005-08-09 20:26:03 -07005#include <asm/byteorder.h>
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07006
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07007/**
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 */
20struct 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
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070049/**
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 */
54struct dccp_hdr_ext {
55 __u32 dccph_seq_low;
56};
57
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070058/**
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 */
64struct dccp_hdr_request {
65 __u32 dccph_req_service;
66};
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070067/**
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 */
73struct dccp_hdr_ack_bits {
74 __u32 dccph_reserved1:8,
75 dccph_ack_nr_high:24;
76 __u32 dccph_ack_nr_low;
77};
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070078/**
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 */
86struct dccp_hdr_response {
87 struct dccp_hdr_ack_bits dccph_resp_ack;
88 __u32 dccph_resp_service;
89};
90
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070091/**
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 */
97struct dccp_hdr_reset {
98 struct dccp_hdr_ack_bits dccph_reset_ack;
99 __u8 dccph_reset_code,
100 dccph_reset_data[3];
101};
102
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700103enum 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
119static 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}
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700136enum 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 */
152enum {
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 */
169enum {
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
Arnaldo Carvalho de Meloa84ffe42005-08-28 04:51:32 -0300179/* DCCP socket options */
180#define DCCP_SOCKOPT_PACKET_SIZE 1
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700181#define DCCP_SOCKOPT_SERVICE 2
182
183#define DCCP_SERVICE_LIST_MAX_LEN 32
Arnaldo Carvalho de Meloa84ffe42005-08-28 04:51:32 -0300184
Harald Welte5a47a472005-08-09 20:26:03 -0700185#ifdef __KERNEL__
186
187#include <linux/in.h>
188#include <linux/list.h>
189#include <linux/uio.h>
190#include <linux/workqueue.h>
191
192#include <net/inet_connection_sock.h>
Arnaldo Carvalho de Melo64cf1e52005-08-09 20:45:21 -0700193#include <net/inet_timewait_sock.h>
Harald Welte5a47a472005-08-09 20:26:03 -0700194#include <net/sock.h>
195#include <net/tcp_states.h>
196#include <net/tcp.h>
197
198enum dccp_state {
199 DCCP_OPEN = TCP_ESTABLISHED,
200 DCCP_REQUESTING = TCP_SYN_SENT,
201 DCCP_PARTOPEN = TCP_FIN_WAIT1, /* FIXME:
202 This mapping is horrible, but TCP has
203 no matching state for DCCP_PARTOPEN,
204 as TCP_SYN_RECV is already used by
205 DCCP_RESPOND, why don't stop using TCP
206 mapping of states? OK, now we don't use
207 sk_stream_sendmsg anymore, so doesn't
208 seem to exist any reason for us to
209 do the TCP mapping here */
210 DCCP_LISTEN = TCP_LISTEN,
211 DCCP_RESPOND = TCP_SYN_RECV,
212 DCCP_CLOSING = TCP_CLOSING,
213 DCCP_TIME_WAIT = TCP_TIME_WAIT,
214 DCCP_CLOSED = TCP_CLOSE,
215 DCCP_MAX_STATES = TCP_MAX_STATES,
216};
217
218#define DCCP_STATE_MASK 0xf
219#define DCCP_ACTION_FIN (1<<7)
220
221enum {
222 DCCPF_OPEN = TCPF_ESTABLISHED,
223 DCCPF_REQUESTING = TCPF_SYN_SENT,
224 DCCPF_PARTOPEN = TCPF_FIN_WAIT1,
225 DCCPF_LISTEN = TCPF_LISTEN,
226 DCCPF_RESPOND = TCPF_SYN_RECV,
227 DCCPF_CLOSING = TCPF_CLOSING,
228 DCCPF_TIME_WAIT = TCPF_TIME_WAIT,
229 DCCPF_CLOSED = TCPF_CLOSE,
230};
231
232static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb)
233{
234 return (struct dccp_hdr *)skb->h.raw;
235}
236
237static inline struct dccp_hdr_ext *dccp_hdrx(const struct sk_buff *skb)
238{
239 return (struct dccp_hdr_ext *)(skb->h.raw + sizeof(struct dccp_hdr));
240}
241
Harald Welte1d3de412005-08-09 20:26:55 -0700242static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh)
243{
244 return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);
245}
246
Harald Welte5a47a472005-08-09 20:26:03 -0700247static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)
248{
249 const struct dccp_hdr *dh = dccp_hdr(skb);
Harald Welte1d3de412005-08-09 20:26:55 -0700250 return __dccp_basic_hdr_len(dh);
Harald Welte5a47a472005-08-09 20:26:03 -0700251}
252
253static inline __u64 dccp_hdr_seq(const struct sk_buff *skb)
254{
255 const struct dccp_hdr *dh = dccp_hdr(skb);
256#if defined(__LITTLE_ENDIAN_BITFIELD)
257 __u64 seq_nr = ntohl(dh->dccph_seq << 8);
258#elif defined(__BIG_ENDIAN_BITFIELD)
259 __u64 seq_nr = ntohl(dh->dccph_seq);
260#else
261#error "Adjust your <asm/byteorder.h> defines"
262#endif
263
264 if (dh->dccph_x != 0)
265 seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(skb)->dccph_seq_low);
266
267 return seq_nr;
268}
269
270static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb)
271{
272 return (struct dccp_hdr_request *)(skb->h.raw + dccp_basic_hdr_len(skb));
273}
274
275static inline struct dccp_hdr_ack_bits *dccp_hdr_ack_bits(const struct sk_buff *skb)
276{
277 return (struct dccp_hdr_ack_bits *)(skb->h.raw + dccp_basic_hdr_len(skb));
278}
279
280static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb)
281{
282 const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb);
283#if defined(__LITTLE_ENDIAN_BITFIELD)
284 return (((u64)ntohl(dhack->dccph_ack_nr_high << 8)) << 32) + ntohl(dhack->dccph_ack_nr_low);
285#elif defined(__BIG_ENDIAN_BITFIELD)
286 return (((u64)ntohl(dhack->dccph_ack_nr_high)) << 32) + ntohl(dhack->dccph_ack_nr_low);
287#else
288#error "Adjust your <asm/byteorder.h> defines"
289#endif
290}
291
292static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb)
293{
294 return (struct dccp_hdr_response *)(skb->h.raw + dccp_basic_hdr_len(skb));
295}
296
297static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb)
298{
299 return (struct dccp_hdr_reset *)(skb->h.raw + dccp_basic_hdr_len(skb));
300}
301
Harald Welte1d3de412005-08-09 20:26:55 -0700302static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh)
303{
304 return __dccp_basic_hdr_len(dh) +
305 dccp_packet_hdr_len(dh->dccph_type);
306}
307
Harald Welte5a47a472005-08-09 20:26:03 -0700308static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
309{
Harald Welte1d3de412005-08-09 20:26:55 -0700310 return __dccp_hdr_len(dccp_hdr(skb));
Harald Welte5a47a472005-08-09 20:26:03 -0700311}
312
313
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700314/* initial values for each feature */
315#define DCCPF_INITIAL_SEQUENCE_WINDOW 100
316/* FIXME: for now we're using CCID 3 (TFRC) */
317#define DCCPF_INITIAL_CCID 3
318#define DCCPF_INITIAL_SEND_ACK_VECTOR 0
319/* FIXME: for now we're default to 1 but it should really be 0 */
320#define DCCPF_INITIAL_SEND_NDP_COUNT 1
321
322#define DCCP_NDP_LIMIT 0xFFFFFF
323
324/**
325 * struct dccp_options - option values for a DCCP connection
326 * @dccpo_sequence_window - Sequence Window Feature (section 7.5.2)
327 * @dccpo_ccid - Congestion Control Id (CCID) (section 10)
328 * @dccpo_send_ack_vector - Send Ack Vector Feature (section 11.5)
329 * @dccpo_send_ndp_count - Send NDP Count Feature (7.7.2)
330 */
331struct dccp_options {
332 __u64 dccpo_sequence_window;
333 __u8 dccpo_ccid;
334 __u8 dccpo_send_ack_vector;
335 __u8 dccpo_send_ndp_count;
336};
337
338extern void __dccp_options_init(struct dccp_options *dccpo);
339extern void dccp_options_init(struct dccp_options *dccpo);
340extern int dccp_parse_options(struct sock *sk, struct sk_buff *skb);
341
342struct dccp_request_sock {
343 struct inet_request_sock dreq_inet_rsk;
344 __u64 dreq_iss;
345 __u64 dreq_isr;
346 __u32 dreq_service;
347};
348
349static inline struct dccp_request_sock *dccp_rsk(const struct request_sock *req)
350{
351 return (struct dccp_request_sock *)req;
352}
353
Arnaldo Carvalho de Melo64cf1e52005-08-09 20:45:21 -0700354extern struct inet_timewait_death_row dccp_death_row;
355
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700356/* Read about the ECN nonce to see why it is 253 */
357#define DCCP_MAX_ACK_VECTOR_LEN 253
358
359struct dccp_options_received {
360 u32 dccpor_ndp:24,
361 dccpor_ack_vector_len:8;
362 u32 dccpor_ack_vector_idx:10;
363 /* 22 bits hole, try to pack */
364 u32 dccpor_timestamp;
365 u32 dccpor_timestamp_echo;
366 u32 dccpor_elapsed_time;
367};
368
369struct ccid;
370
371enum dccp_role {
372 DCCP_ROLE_UNDEFINED,
373 DCCP_ROLE_LISTEN,
374 DCCP_ROLE_CLIENT,
375 DCCP_ROLE_SERVER,
376};
377
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700378struct dccp_service_list {
379 __u32 dccpsl_nr;
380 __u32 dccpsl_list[0];
381};
382
383#define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1)
384
385static inline int dccp_list_has_service(const struct dccp_service_list *sl,
386 const u32 service)
387{
388 if (likely(sl != NULL)) {
389 u32 i = sl->dccpsl_nr;
390 while (i--)
391 if (sl->dccpsl_list[i] == service)
392 return 1;
393 }
394 return 0;
395}
396
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700397/**
398 * struct dccp_sock - DCCP socket state
399 *
400 * @dccps_swl - sequence number window low
401 * @dccps_swh - sequence number window high
402 * @dccps_awl - acknowledgement number window low
403 * @dccps_awh - acknowledgement number window high
404 * @dccps_iss - initial sequence number sent
405 * @dccps_isr - initial sequence number received
406 * @dccps_osr - first OPEN sequence number received
407 * @dccps_gss - greatest sequence number sent
408 * @dccps_gsr - greatest valid sequence number received
409 * @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss
410 * @dccps_timestamp_time - time of latest TIMESTAMP option
411 * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
412 * @dccps_ext_header_len - network protocol overhead (IP/IPv6 options)
413 * @dccps_pmtu_cookie - Last pmtu seen by socket
Arnaldo Carvalho de Meloa84ffe42005-08-28 04:51:32 -0300414 * @dccps_packet_size - Set thru setsockopt
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700415 * @dccps_role - Role of this sock, one of %dccp_role
416 * @dccps_ndp_count - number of Non Data Packets since last data packet
417 * @dccps_hc_rx_ackpkts - receiver half connection acked packets
418 */
419struct dccp_sock {
420 /* inet_connection_sock has to be the first member of dccp_sock */
421 struct inet_connection_sock dccps_inet_connection;
422 __u64 dccps_swl;
423 __u64 dccps_swh;
424 __u64 dccps_awl;
425 __u64 dccps_awh;
426 __u64 dccps_iss;
427 __u64 dccps_isr;
428 __u64 dccps_osr;
429 __u64 dccps_gss;
430 __u64 dccps_gsr;
431 __u64 dccps_gar;
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700432 __u32 dccps_service;
433 struct dccp_service_list *dccps_service_list;
Ian McDonald1bc09862005-08-20 00:23:43 -0300434 struct timeval dccps_timestamp_time;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700435 __u32 dccps_timestamp_echo;
Arnaldo Carvalho de Meloa84ffe42005-08-28 04:51:32 -0300436 __u32 dccps_packet_size;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700437 unsigned long dccps_ndp_count;
438 __u16 dccps_ext_header_len;
439 __u32 dccps_pmtu_cookie;
440 __u32 dccps_mss_cache;
441 struct dccp_options dccps_options;
442 struct dccp_ackpkts *dccps_hc_rx_ackpkts;
443 void *dccps_hc_rx_ccid_private;
444 void *dccps_hc_tx_ccid_private;
445 struct ccid *dccps_hc_rx_ccid;
446 struct ccid *dccps_hc_tx_ccid;
447 struct dccp_options_received dccps_options_received;
Arnaldo Carvalho de Melob0e56782005-09-09 02:38:35 -0300448 struct timeval dccps_epoch;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700449 enum dccp_role dccps_role:2;
Arnaldo Carvalho de Melo507d37c2005-09-09 02:30:07 -0300450 __u8 dccps_hc_rx_insert_options:1;
451 __u8 dccps_hc_tx_insert_options:1;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700452};
453
454static inline struct dccp_sock *dccp_sk(const struct sock *sk)
455{
456 return (struct dccp_sock *)sk;
457}
458
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700459static inline int dccp_service_not_initialized(const struct sock *sk)
460{
461 return dccp_sk(sk)->dccps_service == DCCP_SERVICE_INVALID_VALUE;
462}
463
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700464static inline const char *dccp_role(const struct sock *sk)
465{
466 switch (dccp_sk(sk)->dccps_role) {
467 case DCCP_ROLE_UNDEFINED: return "undefined";
468 case DCCP_ROLE_LISTEN: return "listen";
469 case DCCP_ROLE_SERVER: return "server";
470 case DCCP_ROLE_CLIENT: return "client";
471 }
472 return NULL;
473}
474
Harald Welte5a47a472005-08-09 20:26:03 -0700475#endif /* __KERNEL__ */
476
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700477#endif /* _LINUX_DCCP_H */