4 #include <linux/types.h>
5 #include <asm/byteorder.h>
8 * struct dccp_hdr - generic part of DCCP packet header
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
24 #if defined(__LITTLE_ENDIAN_BITFIELD)
27 #elif defined(__BIG_ENDIAN_BITFIELD)
31 #error "Adjust your <asm/byteorder.h> defines"
33 __sum16 dccph_checksum;
34 #if defined(__LITTLE_ENDIAN_BITFIELD)
38 #elif defined(__BIG_ENDIAN_BITFIELD)
39 __u8 dccph_reserved:3,
43 #error "Adjust your <asm/byteorder.h> defines"
50 * struct dccp_hdr_ext - the low bits of a 48 bit seq packet
52 * @dccph_seq_low - low 24 bits of a 48 bit seq packet
59 * struct dccp_hdr_request - Connection initiation request header
61 * @dccph_req_service - Service to which the client app wants to connect
63 struct dccp_hdr_request {
64 __be32 dccph_req_service;
67 * struct dccp_hdr_ack_bits - acknowledgment bits common to most packets
69 * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR
70 * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR
72 struct dccp_hdr_ack_bits {
73 __be16 dccph_reserved1;
74 __be16 dccph_ack_nr_high;
75 __be32 dccph_ack_nr_low;
78 * struct dccp_hdr_response - Connection initiation response header
80 * @dccph_resp_ack - 48 bit Acknowledgment Number Subheader (5.3)
81 * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
83 struct dccp_hdr_response {
84 struct dccp_hdr_ack_bits dccph_resp_ack;
85 __be32 dccph_resp_service;
89 * struct dccp_hdr_reset - Unconditionally shut down a connection
91 * @dccph_reset_ack - 48 bit Acknowledgment Number Subheader (5.6)
92 * @dccph_reset_code - one of %dccp_reset_codes
93 * @dccph_reset_data - the Data 1 ... Data 3 fields from 5.6
95 struct dccp_hdr_reset {
96 struct dccp_hdr_ack_bits dccph_reset_ack;
97 __u8 dccph_reset_code,
102 DCCP_PKT_REQUEST = 0,
115 #define DCCP_NR_PKT_TYPES DCCP_PKT_INVALID
117 static inline unsigned int dccp_packet_hdr_len(const __u8 type)
119 if (type == DCCP_PKT_DATA)
121 if (type == DCCP_PKT_DATAACK ||
122 type == DCCP_PKT_ACK ||
123 type == DCCP_PKT_SYNC ||
124 type == DCCP_PKT_SYNCACK ||
125 type == DCCP_PKT_CLOSE ||
126 type == DCCP_PKT_CLOSEREQ)
127 return sizeof(struct dccp_hdr_ack_bits);
128 if (type == DCCP_PKT_REQUEST)
129 return sizeof(struct dccp_hdr_request);
130 if (type == DCCP_PKT_RESPONSE)
131 return sizeof(struct dccp_hdr_response);
132 return sizeof(struct dccp_hdr_reset);
134 enum dccp_reset_codes {
135 DCCP_RESET_CODE_UNSPECIFIED = 0,
136 DCCP_RESET_CODE_CLOSED,
137 DCCP_RESET_CODE_ABORTED,
138 DCCP_RESET_CODE_NO_CONNECTION,
139 DCCP_RESET_CODE_PACKET_ERROR,
140 DCCP_RESET_CODE_OPTION_ERROR,
141 DCCP_RESET_CODE_MANDATORY_ERROR,
142 DCCP_RESET_CODE_CONNECTION_REFUSED,
143 DCCP_RESET_CODE_BAD_SERVICE_CODE,
144 DCCP_RESET_CODE_TOO_BUSY,
145 DCCP_RESET_CODE_BAD_INIT_COOKIE,
146 DCCP_RESET_CODE_AGGRESSION_PENALTY,
148 DCCP_MAX_RESET_CODES /* Leave at the end! */
155 DCCPO_MIN_RESERVED = 3,
156 DCCPO_MAX_RESERVED = 31,
158 DCCPO_CONFIRM_L = 33,
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,
168 DCCPO_MIN_CCID_SPECIFIC = 128,
169 DCCPO_MAX_CCID_SPECIFIC = 255,
178 /* DCCP features (RFC 4340 section 6.4) */
179 enum dccp_feature_numbers {
182 DCCPF_SHORT_SEQNOS = 2,
183 DCCPF_SEQUENCE_WINDOW = 3,
184 DCCPF_ECN_INCAPABLE = 4,
186 DCCPF_SEND_ACK_VECTOR = 6,
187 DCCPF_SEND_NDP_COUNT = 7,
188 DCCPF_MIN_CSUM_COVER = 8,
189 DCCPF_DATA_CHECKSUM = 9,
190 /* 10-127 reserved */
191 DCCPF_MIN_CCID_SPECIFIC = 128,
192 DCCPF_SEND_LEV_RATE = 192, /* RFC 4342, sec. 8.4 */
193 DCCPF_MAX_CCID_SPECIFIC = 255,
196 /* DCCP socket options */
197 #define DCCP_SOCKOPT_PACKET_SIZE 1 /* XXX deprecated, without effect */
198 #define DCCP_SOCKOPT_SERVICE 2
199 #define DCCP_SOCKOPT_CHANGE_L 3
200 #define DCCP_SOCKOPT_CHANGE_R 4
201 #define DCCP_SOCKOPT_GET_CUR_MPS 5
202 #define DCCP_SOCKOPT_SERVER_TIMEWAIT 6
203 #define DCCP_SOCKOPT_SEND_CSCOV 10
204 #define DCCP_SOCKOPT_RECV_CSCOV 11
205 #define DCCP_SOCKOPT_AVAILABLE_CCIDS 12
206 #define DCCP_SOCKOPT_CCID_RX_INFO 128
207 #define DCCP_SOCKOPT_CCID_TX_INFO 192
209 /* maximum number of services provided on the same listening port */
210 #define DCCP_SERVICE_LIST_MAX_LEN 32
214 #include <linux/in.h>
215 #include <linux/ktime.h>
216 #include <linux/list.h>
217 #include <linux/uio.h>
218 #include <linux/workqueue.h>
220 #include <net/inet_connection_sock.h>
221 #include <net/inet_sock.h>
222 #include <net/inet_timewait_sock.h>
223 #include <net/tcp_states.h>
226 DCCP_OPEN = TCP_ESTABLISHED,
227 DCCP_REQUESTING = TCP_SYN_SENT,
228 DCCP_LISTEN = TCP_LISTEN,
229 DCCP_RESPOND = TCP_SYN_RECV,
231 * States involved in closing a DCCP connection:
232 * 1) ACTIVE_CLOSEREQ is entered by a server sending a CloseReq.
234 * 2) CLOSING can have three different meanings (RFC 4340, 8.3):
235 * a. Client has performed active-close, has sent a Close to the server
236 * from state OPEN or PARTOPEN, and is waiting for the final Reset
237 * (in this case, SOCK_DONE == 1).
238 * b. Client is asked to perform passive-close, by receiving a CloseReq
239 * in (PART)OPEN state. It sends a Close and waits for final Reset
240 * (in this case, SOCK_DONE == 0).
241 * c. Server performs an active-close as in (a), keeps TIMEWAIT state.
243 * 3) The following intermediate states are employed to give passively
244 * closing nodes a chance to process their unread data:
245 * - PASSIVE_CLOSE (from OPEN => CLOSED) and
246 * - PASSIVE_CLOSEREQ (from (PART)OPEN to CLOSING; case (b) above).
248 DCCP_ACTIVE_CLOSEREQ = TCP_FIN_WAIT1,
249 DCCP_PASSIVE_CLOSE = TCP_CLOSE_WAIT, /* any node receiving a Close */
250 DCCP_CLOSING = TCP_CLOSING,
251 DCCP_TIME_WAIT = TCP_TIME_WAIT,
252 DCCP_CLOSED = TCP_CLOSE,
253 DCCP_PARTOPEN = TCP_MAX_STATES,
254 DCCP_PASSIVE_CLOSEREQ, /* clients receiving CloseReq */
258 #define DCCP_STATE_MASK 0x1f
261 DCCPF_OPEN = TCPF_ESTABLISHED,
262 DCCPF_REQUESTING = TCPF_SYN_SENT,
263 DCCPF_LISTEN = TCPF_LISTEN,
264 DCCPF_RESPOND = TCPF_SYN_RECV,
265 DCCPF_ACTIVE_CLOSEREQ = TCPF_FIN_WAIT1,
266 DCCPF_CLOSING = TCPF_CLOSING,
267 DCCPF_TIME_WAIT = TCPF_TIME_WAIT,
268 DCCPF_CLOSED = TCPF_CLOSE,
269 DCCPF_PARTOPEN = (1 << DCCP_PARTOPEN),
272 static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb)
274 return (struct dccp_hdr *)skb_transport_header(skb);
277 static inline struct dccp_hdr *dccp_zeroed_hdr(struct sk_buff *skb, int headlen)
279 skb_push(skb, headlen);
280 skb_reset_transport_header(skb);
281 return memset(skb_transport_header(skb), 0, headlen);
284 static inline struct dccp_hdr_ext *dccp_hdrx(const struct dccp_hdr *dh)
286 return (struct dccp_hdr_ext *)((unsigned char *)dh + sizeof(*dh));
289 static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh)
291 return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);
294 static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)
296 const struct dccp_hdr *dh = dccp_hdr(skb);
297 return __dccp_basic_hdr_len(dh);
300 static inline __u64 dccp_hdr_seq(const struct dccp_hdr *dh)
302 __u64 seq_nr = ntohs(dh->dccph_seq);
304 if (dh->dccph_x != 0)
305 seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(dh)->dccph_seq_low);
307 seq_nr += (u32)dh->dccph_seq2 << 16;
312 static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb)
314 return (struct dccp_hdr_request *)(skb_transport_header(skb) +
315 dccp_basic_hdr_len(skb));
318 static inline struct dccp_hdr_ack_bits *dccp_hdr_ack_bits(const struct sk_buff *skb)
320 return (struct dccp_hdr_ack_bits *)(skb_transport_header(skb) +
321 dccp_basic_hdr_len(skb));
324 static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb)
326 const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb);
327 return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) + ntohl(dhack->dccph_ack_nr_low);
330 static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb)
332 return (struct dccp_hdr_response *)(skb_transport_header(skb) +
333 dccp_basic_hdr_len(skb));
336 static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb)
338 return (struct dccp_hdr_reset *)(skb_transport_header(skb) +
339 dccp_basic_hdr_len(skb));
342 static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh)
344 return __dccp_basic_hdr_len(dh) +
345 dccp_packet_hdr_len(dh->dccph_type);
348 static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
350 return __dccp_hdr_len(dccp_hdr(skb));
354 /* initial values for each feature */
355 #define DCCPF_INITIAL_SEQUENCE_WINDOW 100
356 #define DCCPF_INITIAL_ACK_RATIO 2
357 #define DCCPF_INITIAL_CCID DCCPC_CCID2
358 #define DCCPF_INITIAL_SEND_ACK_VECTOR 1
359 /* FIXME: for now we're default to 1 but it should really be 0 */
360 #define DCCPF_INITIAL_SEND_NDP_COUNT 1
363 * struct dccp_minisock - Minimal DCCP connection representation
365 * Will be used to pass the state from dccp_request_sock to dccp_sock.
367 * @dccpms_sequence_window - Sequence Window Feature (section 7.5.2)
368 * @dccpms_ccid - Congestion Control Id (CCID) (section 10)
369 * @dccpms_send_ack_vector - Send Ack Vector Feature (section 11.5)
370 * @dccpms_send_ndp_count - Send NDP Count Feature (7.7.2)
371 * @dccpms_ack_ratio - Ack Ratio Feature (section 11.3)
372 * @dccpms_pending - List of features being negotiated
375 struct dccp_minisock {
376 __u64 dccpms_sequence_window;
379 __u8 dccpms_send_ack_vector;
380 __u8 dccpms_send_ndp_count;
381 __u8 dccpms_ack_ratio;
382 struct list_head dccpms_pending;
383 struct list_head dccpms_conf;
386 struct dccp_opt_conf {
391 struct dccp_opt_pend {
392 struct list_head dccpop_node;
398 struct dccp_opt_conf *dccpop_sc;
401 extern void dccp_minisock_init(struct dccp_minisock *dmsk);
404 * struct dccp_request_sock - represent DCCP-specific connection request
405 * @dreq_inet_rsk: structure inherited from
406 * @dreq_iss: initial sequence number sent on the Response (RFC 4340, 7.1)
407 * @dreq_isr: initial sequence number received on the Request
408 * @dreq_service: service code present on the Request (there is just one)
409 * @dreq_featneg: feature negotiation options for this connection
410 * The following two fields are analogous to the ones in dccp_sock:
411 * @dreq_timestamp_echo: last received timestamp to echo (13.1)
412 * @dreq_timestamp_echo: the time of receiving the last @dreq_timestamp_echo
414 struct dccp_request_sock {
415 struct inet_request_sock dreq_inet_rsk;
419 struct list_head dreq_featneg;
420 __u32 dreq_timestamp_echo;
421 __u32 dreq_timestamp_time;
424 static inline struct dccp_request_sock *dccp_rsk(const struct request_sock *req)
426 return (struct dccp_request_sock *)req;
429 extern struct inet_timewait_death_row dccp_death_row;
431 extern int dccp_parse_options(struct sock *sk, struct dccp_request_sock *dreq,
432 struct sk_buff *skb);
434 struct dccp_options_received {
436 u32 dccpor_timestamp;
437 u32 dccpor_timestamp_echo;
438 u32 dccpor_elapsed_time;
450 struct dccp_service_list {
452 __be32 dccpsl_list[0];
455 #define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1)
456 #define DCCP_SERVICE_CODE_IS_ABSENT 0
458 static inline int dccp_list_has_service(const struct dccp_service_list *sl,
459 const __be32 service)
461 if (likely(sl != NULL)) {
462 u32 i = sl->dccpsl_nr;
464 if (sl->dccpsl_list[i] == service)
473 * struct dccp_sock - DCCP socket state
475 * @dccps_swl - sequence number window low
476 * @dccps_swh - sequence number window high
477 * @dccps_awl - acknowledgement number window low
478 * @dccps_awh - acknowledgement number window high
479 * @dccps_iss - initial sequence number sent
480 * @dccps_isr - initial sequence number received
481 * @dccps_osr - first OPEN sequence number received
482 * @dccps_gss - greatest sequence number sent
483 * @dccps_gsr - greatest valid sequence number received
484 * @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss
485 * @dccps_service - first (passive sock) or unique (active sock) service code
486 * @dccps_service_list - second .. last service code on passive socket
487 * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
488 * @dccps_timestamp_time - time of receiving latest @dccps_timestamp_echo
489 * @dccps_l_ack_ratio - feature-local Ack Ratio
490 * @dccps_r_ack_ratio - feature-remote Ack Ratio
491 * @dccps_pcslen - sender partial checksum coverage (via sockopt)
492 * @dccps_pcrlen - receiver partial checksum coverage (via sockopt)
493 * @dccps_ndp_count - number of Non Data Packets since last data packet
494 * @dccps_mss_cache - current value of MSS (path MTU minus header sizes)
495 * @dccps_rate_last - timestamp for rate-limiting DCCP-Sync (RFC 4340, 7.5.4)
496 * @dccps_minisock - associated minisock (accessed via dccp_msk)
497 * @dccps_featneg - tracks feature-negotiation state (mostly during handshake)
498 * @dccps_hc_rx_ackvec - rx half connection ack vector
499 * @dccps_hc_rx_ccid - CCID used for the receiver (or receiving half-connection)
500 * @dccps_hc_tx_ccid - CCID used for the sender (or sending half-connection)
501 * @dccps_options_received - parsed set of retrieved options
502 * @dccps_role - role of this sock, one of %dccp_role
503 * @dccps_hc_rx_insert_options - receiver wants to add options when acking
504 * @dccps_hc_tx_insert_options - sender wants to add options when sending
505 * @dccps_server_timewait - server holds timewait state on close (RFC 4340, 8.3)
506 * @dccps_xmit_timer - timer for when CCID is not ready to send
507 * @dccps_syn_rtt - RTT sample from Request/Response exchange (in usecs)
510 /* inet_connection_sock has to be the first member of dccp_sock */
511 struct inet_connection_sock dccps_inet_connection;
512 #define dccps_syn_rtt dccps_inet_connection.icsk_ack.lrcvtime
523 __be32 dccps_service;
524 __u32 dccps_mss_cache;
525 struct dccp_service_list *dccps_service_list;
526 __u32 dccps_timestamp_echo;
527 __u32 dccps_timestamp_time;
528 __u16 dccps_l_ack_ratio;
529 __u16 dccps_r_ack_ratio;
532 __u64 dccps_ndp_count:48;
533 unsigned long dccps_rate_last;
534 struct dccp_minisock dccps_minisock;
535 struct list_head dccps_featneg;
536 struct dccp_ackvec *dccps_hc_rx_ackvec;
537 struct ccid *dccps_hc_rx_ccid;
538 struct ccid *dccps_hc_tx_ccid;
539 struct dccp_options_received dccps_options_received;
540 enum dccp_role dccps_role:2;
541 __u8 dccps_hc_rx_insert_options:1;
542 __u8 dccps_hc_tx_insert_options:1;
543 __u8 dccps_server_timewait:1;
544 struct timer_list dccps_xmit_timer;
547 static inline struct dccp_sock *dccp_sk(const struct sock *sk)
549 return (struct dccp_sock *)sk;
552 static inline struct dccp_minisock *dccp_msk(const struct sock *sk)
554 return (struct dccp_minisock *)&dccp_sk(sk)->dccps_minisock;
557 static inline const char *dccp_role(const struct sock *sk)
559 switch (dccp_sk(sk)->dccps_role) {
560 case DCCP_ROLE_UNDEFINED: return "undefined";
561 case DCCP_ROLE_LISTEN: return "listen";
562 case DCCP_ROLE_SERVER: return "server";
563 case DCCP_ROLE_CLIENT: return "client";
568 #endif /* __KERNEL__ */
570 #endif /* _LINUX_DCCP_H */