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_RX_CCID_SPECIFIC = 128, /* from sender to receiver */
169 DCCPO_MAX_RX_CCID_SPECIFIC = 191,
170 DCCPO_MIN_TX_CCID_SPECIFIC = 192, /* from receiver to sender */
171 DCCPO_MAX_TX_CCID_SPECIFIC = 255,
173 /* maximum size of a single TLV-encoded DCCP option (sans type/len bytes) */
174 #define DCCP_SINGLE_OPT_MAXLEN 253
182 /* DCCP features (RFC 4340 section 6.4) */
183 enum dccp_feature_numbers {
186 DCCPF_SHORT_SEQNOS = 2,
187 DCCPF_SEQUENCE_WINDOW = 3,
188 DCCPF_ECN_INCAPABLE = 4,
190 DCCPF_SEND_ACK_VECTOR = 6,
191 DCCPF_SEND_NDP_COUNT = 7,
192 DCCPF_MIN_CSUM_COVER = 8,
193 DCCPF_DATA_CHECKSUM = 9,
194 /* 10-127 reserved */
195 DCCPF_MIN_CCID_SPECIFIC = 128,
196 DCCPF_SEND_LEV_RATE = 192, /* RFC 4342, sec. 8.4 */
197 DCCPF_MAX_CCID_SPECIFIC = 255,
200 /* DCCP socket control message types for cmsg */
201 enum dccp_cmsg_type {
202 DCCP_SCM_PRIORITY = 1,
203 DCCP_SCM_QPOLICY_MAX = 0xFFFF,
204 /* ^-- Up to here reserved exclusively for qpolicy parameters */
208 /* DCCP priorities for outgoing/queued packets */
209 enum dccp_packet_dequeueing_policy {
215 /* DCCP socket options */
216 #define DCCP_SOCKOPT_PACKET_SIZE 1 /* XXX deprecated, without effect */
217 #define DCCP_SOCKOPT_SERVICE 2
218 #define DCCP_SOCKOPT_CHANGE_L 3
219 #define DCCP_SOCKOPT_CHANGE_R 4
220 #define DCCP_SOCKOPT_GET_CUR_MPS 5
221 #define DCCP_SOCKOPT_SERVER_TIMEWAIT 6
222 #define DCCP_SOCKOPT_SEND_CSCOV 10
223 #define DCCP_SOCKOPT_RECV_CSCOV 11
224 #define DCCP_SOCKOPT_AVAILABLE_CCIDS 12
225 #define DCCP_SOCKOPT_CCID 13
226 #define DCCP_SOCKOPT_TX_CCID 14
227 #define DCCP_SOCKOPT_RX_CCID 15
228 #define DCCP_SOCKOPT_QPOLICY_ID 16
229 #define DCCP_SOCKOPT_QPOLICY_TXQLEN 17
230 #define DCCP_SOCKOPT_CCID_RX_INFO 128
231 #define DCCP_SOCKOPT_CCID_TX_INFO 192
233 /* maximum number of services provided on the same listening port */
234 #define DCCP_SERVICE_LIST_MAX_LEN 32
238 #include <linux/in.h>
239 #include <linux/interrupt.h>
240 #include <linux/ktime.h>
241 #include <linux/list.h>
242 #include <linux/uio.h>
243 #include <linux/workqueue.h>
245 #include <net/inet_connection_sock.h>
246 #include <net/inet_sock.h>
247 #include <net/inet_timewait_sock.h>
248 #include <net/tcp_states.h>
251 DCCP_OPEN = TCP_ESTABLISHED,
252 DCCP_REQUESTING = TCP_SYN_SENT,
253 DCCP_LISTEN = TCP_LISTEN,
254 DCCP_RESPOND = TCP_SYN_RECV,
256 * States involved in closing a DCCP connection:
257 * 1) ACTIVE_CLOSEREQ is entered by a server sending a CloseReq.
259 * 2) CLOSING can have three different meanings (RFC 4340, 8.3):
260 * a. Client has performed active-close, has sent a Close to the server
261 * from state OPEN or PARTOPEN, and is waiting for the final Reset
262 * (in this case, SOCK_DONE == 1).
263 * b. Client is asked to perform passive-close, by receiving a CloseReq
264 * in (PART)OPEN state. It sends a Close and waits for final Reset
265 * (in this case, SOCK_DONE == 0).
266 * c. Server performs an active-close as in (a), keeps TIMEWAIT state.
268 * 3) The following intermediate states are employed to give passively
269 * closing nodes a chance to process their unread data:
270 * - PASSIVE_CLOSE (from OPEN => CLOSED) and
271 * - PASSIVE_CLOSEREQ (from (PART)OPEN to CLOSING; case (b) above).
273 DCCP_ACTIVE_CLOSEREQ = TCP_FIN_WAIT1,
274 DCCP_PASSIVE_CLOSE = TCP_CLOSE_WAIT, /* any node receiving a Close */
275 DCCP_CLOSING = TCP_CLOSING,
276 DCCP_TIME_WAIT = TCP_TIME_WAIT,
277 DCCP_CLOSED = TCP_CLOSE,
278 DCCP_PARTOPEN = TCP_MAX_STATES,
279 DCCP_PASSIVE_CLOSEREQ, /* clients receiving CloseReq */
284 DCCPF_OPEN = TCPF_ESTABLISHED,
285 DCCPF_REQUESTING = TCPF_SYN_SENT,
286 DCCPF_LISTEN = TCPF_LISTEN,
287 DCCPF_RESPOND = TCPF_SYN_RECV,
288 DCCPF_ACTIVE_CLOSEREQ = TCPF_FIN_WAIT1,
289 DCCPF_CLOSING = TCPF_CLOSING,
290 DCCPF_TIME_WAIT = TCPF_TIME_WAIT,
291 DCCPF_CLOSED = TCPF_CLOSE,
292 DCCPF_PARTOPEN = (1 << DCCP_PARTOPEN),
295 static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb)
297 return (struct dccp_hdr *)skb_transport_header(skb);
300 static inline struct dccp_hdr *dccp_zeroed_hdr(struct sk_buff *skb, int headlen)
302 skb_push(skb, headlen);
303 skb_reset_transport_header(skb);
304 return memset(skb_transport_header(skb), 0, headlen);
307 static inline struct dccp_hdr_ext *dccp_hdrx(const struct dccp_hdr *dh)
309 return (struct dccp_hdr_ext *)((unsigned char *)dh + sizeof(*dh));
312 static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh)
314 return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);
317 static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)
319 const struct dccp_hdr *dh = dccp_hdr(skb);
320 return __dccp_basic_hdr_len(dh);
323 static inline __u64 dccp_hdr_seq(const struct dccp_hdr *dh)
325 __u64 seq_nr = ntohs(dh->dccph_seq);
327 if (dh->dccph_x != 0)
328 seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(dh)->dccph_seq_low);
330 seq_nr += (u32)dh->dccph_seq2 << 16;
335 static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb)
337 return (struct dccp_hdr_request *)(skb_transport_header(skb) +
338 dccp_basic_hdr_len(skb));
341 static inline struct dccp_hdr_ack_bits *dccp_hdr_ack_bits(const struct sk_buff *skb)
343 return (struct dccp_hdr_ack_bits *)(skb_transport_header(skb) +
344 dccp_basic_hdr_len(skb));
347 static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb)
349 const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb);
350 return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) + ntohl(dhack->dccph_ack_nr_low);
353 static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb)
355 return (struct dccp_hdr_response *)(skb_transport_header(skb) +
356 dccp_basic_hdr_len(skb));
359 static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb)
361 return (struct dccp_hdr_reset *)(skb_transport_header(skb) +
362 dccp_basic_hdr_len(skb));
365 static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh)
367 return __dccp_basic_hdr_len(dh) +
368 dccp_packet_hdr_len(dh->dccph_type);
371 static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
373 return __dccp_hdr_len(dccp_hdr(skb));
377 * struct dccp_request_sock - represent DCCP-specific connection request
378 * @dreq_inet_rsk: structure inherited from
379 * @dreq_iss: initial sequence number sent on the Response (RFC 4340, 7.1)
380 * @dreq_isr: initial sequence number received on the Request
381 * @dreq_service: service code present on the Request (there is just one)
382 * @dreq_featneg: feature negotiation options for this connection
383 * The following two fields are analogous to the ones in dccp_sock:
384 * @dreq_timestamp_echo: last received timestamp to echo (13.1)
385 * @dreq_timestamp_echo: the time of receiving the last @dreq_timestamp_echo
387 struct dccp_request_sock {
388 struct inet_request_sock dreq_inet_rsk;
392 struct list_head dreq_featneg;
393 __u32 dreq_timestamp_echo;
394 __u32 dreq_timestamp_time;
397 static inline struct dccp_request_sock *dccp_rsk(const struct request_sock *req)
399 return (struct dccp_request_sock *)req;
402 extern struct inet_timewait_death_row dccp_death_row;
404 extern int dccp_parse_options(struct sock *sk, struct dccp_request_sock *dreq,
405 struct sk_buff *skb);
407 struct dccp_options_received {
409 u32 dccpor_timestamp;
410 u32 dccpor_timestamp_echo;
411 u32 dccpor_elapsed_time;
423 struct dccp_service_list {
425 __be32 dccpsl_list[0];
428 #define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1)
429 #define DCCP_SERVICE_CODE_IS_ABSENT 0
431 static inline int dccp_list_has_service(const struct dccp_service_list *sl,
432 const __be32 service)
434 if (likely(sl != NULL)) {
435 u32 i = sl->dccpsl_nr;
437 if (sl->dccpsl_list[i] == service)
446 * struct dccp_sock - DCCP socket state
448 * @dccps_swl - sequence number window low
449 * @dccps_swh - sequence number window high
450 * @dccps_awl - acknowledgement number window low
451 * @dccps_awh - acknowledgement number window high
452 * @dccps_iss - initial sequence number sent
453 * @dccps_isr - initial sequence number received
454 * @dccps_osr - first OPEN sequence number received
455 * @dccps_gss - greatest sequence number sent
456 * @dccps_gsr - greatest valid sequence number received
457 * @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss
458 * @dccps_service - first (passive sock) or unique (active sock) service code
459 * @dccps_service_list - second .. last service code on passive socket
460 * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
461 * @dccps_timestamp_time - time of receiving latest @dccps_timestamp_echo
462 * @dccps_l_ack_ratio - feature-local Ack Ratio
463 * @dccps_r_ack_ratio - feature-remote Ack Ratio
464 * @dccps_l_seq_win - local Sequence Window (influences ack number validity)
465 * @dccps_r_seq_win - remote Sequence Window (influences seq number validity)
466 * @dccps_pcslen - sender partial checksum coverage (via sockopt)
467 * @dccps_pcrlen - receiver partial checksum coverage (via sockopt)
468 * @dccps_send_ndp_count - local Send NDP Count feature (7.7.2)
469 * @dccps_ndp_count - number of Non Data Packets since last data packet
470 * @dccps_mss_cache - current value of MSS (path MTU minus header sizes)
471 * @dccps_rate_last - timestamp for rate-limiting DCCP-Sync (RFC 4340, 7.5.4)
472 * @dccps_featneg - tracks feature-negotiation state (mostly during handshake)
473 * @dccps_hc_rx_ackvec - rx half connection ack vector
474 * @dccps_hc_rx_ccid - CCID used for the receiver (or receiving half-connection)
475 * @dccps_hc_tx_ccid - CCID used for the sender (or sending half-connection)
476 * @dccps_options_received - parsed set of retrieved options
477 * @dccps_qpolicy - TX dequeueing policy, one of %dccp_packet_dequeueing_policy
478 * @dccps_tx_qlen - maximum length of the TX queue
479 * @dccps_role - role of this sock, one of %dccp_role
480 * @dccps_hc_rx_insert_options - receiver wants to add options when acking
481 * @dccps_hc_tx_insert_options - sender wants to add options when sending
482 * @dccps_server_timewait - server holds timewait state on close (RFC 4340, 8.3)
483 * @dccps_sync_scheduled - flag which signals "send out-of-band message soon"
484 * @dccps_xmitlet - tasklet scheduled by the TX CCID to dequeue data packets
485 * @dccps_xmit_timer - used by the TX CCID to delay sending (rate-based pacing)
486 * @dccps_syn_rtt - RTT sample from Request/Response exchange (in usecs)
489 /* inet_connection_sock has to be the first member of dccp_sock */
490 struct inet_connection_sock dccps_inet_connection;
491 #define dccps_syn_rtt dccps_inet_connection.icsk_ack.lrcvtime
502 __be32 dccps_service;
503 __u32 dccps_mss_cache;
504 struct dccp_service_list *dccps_service_list;
505 __u32 dccps_timestamp_echo;
506 __u32 dccps_timestamp_time;
507 __u16 dccps_l_ack_ratio;
508 __u16 dccps_r_ack_ratio;
509 __u64 dccps_l_seq_win:48;
510 __u64 dccps_r_seq_win:48;
513 __u8 dccps_send_ndp_count:1;
514 __u64 dccps_ndp_count:48;
515 unsigned long dccps_rate_last;
516 struct list_head dccps_featneg;
517 struct dccp_ackvec *dccps_hc_rx_ackvec;
518 struct ccid *dccps_hc_rx_ccid;
519 struct ccid *dccps_hc_tx_ccid;
520 struct dccp_options_received dccps_options_received;
523 enum dccp_role dccps_role:2;
524 __u8 dccps_hc_rx_insert_options:1;
525 __u8 dccps_hc_tx_insert_options:1;
526 __u8 dccps_server_timewait:1;
527 __u8 dccps_sync_scheduled:1;
528 struct tasklet_struct dccps_xmitlet;
529 struct timer_list dccps_xmit_timer;
532 static inline struct dccp_sock *dccp_sk(const struct sock *sk)
534 return (struct dccp_sock *)sk;
537 static inline const char *dccp_role(const struct sock *sk)
539 switch (dccp_sk(sk)->dccps_role) {
540 case DCCP_ROLE_UNDEFINED: return "undefined";
541 case DCCP_ROLE_LISTEN: return "listen";
542 case DCCP_ROLE_SERVER: return "server";
543 case DCCP_ROLE_CLIENT: return "client";
548 #endif /* __KERNEL__ */
550 #endif /* _LINUX_DCCP_H */