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 options */
201 #define DCCP_SOCKOPT_PACKET_SIZE 1 /* XXX deprecated, without effect */
202 #define DCCP_SOCKOPT_SERVICE 2
203 #define DCCP_SOCKOPT_CHANGE_L 3
204 #define DCCP_SOCKOPT_CHANGE_R 4
205 #define DCCP_SOCKOPT_GET_CUR_MPS 5
206 #define DCCP_SOCKOPT_SERVER_TIMEWAIT 6
207 #define DCCP_SOCKOPT_SEND_CSCOV 10
208 #define DCCP_SOCKOPT_RECV_CSCOV 11
209 #define DCCP_SOCKOPT_AVAILABLE_CCIDS 12
210 #define DCCP_SOCKOPT_CCID 13
211 #define DCCP_SOCKOPT_TX_CCID 14
212 #define DCCP_SOCKOPT_RX_CCID 15
213 #define DCCP_SOCKOPT_CCID_RX_INFO 128
214 #define DCCP_SOCKOPT_CCID_TX_INFO 192
216 /* maximum number of services provided on the same listening port */
217 #define DCCP_SERVICE_LIST_MAX_LEN 32
221 #include <linux/in.h>
222 #include <linux/ktime.h>
223 #include <linux/list.h>
224 #include <linux/uio.h>
225 #include <linux/workqueue.h>
227 #include <net/inet_connection_sock.h>
228 #include <net/inet_sock.h>
229 #include <net/inet_timewait_sock.h>
230 #include <net/tcp_states.h>
233 DCCP_OPEN = TCP_ESTABLISHED,
234 DCCP_REQUESTING = TCP_SYN_SENT,
235 DCCP_LISTEN = TCP_LISTEN,
236 DCCP_RESPOND = TCP_SYN_RECV,
238 * States involved in closing a DCCP connection:
239 * 1) ACTIVE_CLOSEREQ is entered by a server sending a CloseReq.
241 * 2) CLOSING can have three different meanings (RFC 4340, 8.3):
242 * a. Client has performed active-close, has sent a Close to the server
243 * from state OPEN or PARTOPEN, and is waiting for the final Reset
244 * (in this case, SOCK_DONE == 1).
245 * b. Client is asked to perform passive-close, by receiving a CloseReq
246 * in (PART)OPEN state. It sends a Close and waits for final Reset
247 * (in this case, SOCK_DONE == 0).
248 * c. Server performs an active-close as in (a), keeps TIMEWAIT state.
250 * 3) The following intermediate states are employed to give passively
251 * closing nodes a chance to process their unread data:
252 * - PASSIVE_CLOSE (from OPEN => CLOSED) and
253 * - PASSIVE_CLOSEREQ (from (PART)OPEN to CLOSING; case (b) above).
255 DCCP_ACTIVE_CLOSEREQ = TCP_FIN_WAIT1,
256 DCCP_PASSIVE_CLOSE = TCP_CLOSE_WAIT, /* any node receiving a Close */
257 DCCP_CLOSING = TCP_CLOSING,
258 DCCP_TIME_WAIT = TCP_TIME_WAIT,
259 DCCP_CLOSED = TCP_CLOSE,
260 DCCP_PARTOPEN = TCP_MAX_STATES,
261 DCCP_PASSIVE_CLOSEREQ, /* clients receiving CloseReq */
265 #define DCCP_STATE_MASK 0x1f
268 DCCPF_OPEN = TCPF_ESTABLISHED,
269 DCCPF_REQUESTING = TCPF_SYN_SENT,
270 DCCPF_LISTEN = TCPF_LISTEN,
271 DCCPF_RESPOND = TCPF_SYN_RECV,
272 DCCPF_ACTIVE_CLOSEREQ = TCPF_FIN_WAIT1,
273 DCCPF_CLOSING = TCPF_CLOSING,
274 DCCPF_TIME_WAIT = TCPF_TIME_WAIT,
275 DCCPF_CLOSED = TCPF_CLOSE,
276 DCCPF_PARTOPEN = (1 << DCCP_PARTOPEN),
279 static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb)
281 return (struct dccp_hdr *)skb_transport_header(skb);
284 static inline struct dccp_hdr *dccp_zeroed_hdr(struct sk_buff *skb, int headlen)
286 skb_push(skb, headlen);
287 skb_reset_transport_header(skb);
288 return memset(skb_transport_header(skb), 0, headlen);
291 static inline struct dccp_hdr_ext *dccp_hdrx(const struct dccp_hdr *dh)
293 return (struct dccp_hdr_ext *)((unsigned char *)dh + sizeof(*dh));
296 static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh)
298 return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);
301 static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)
303 const struct dccp_hdr *dh = dccp_hdr(skb);
304 return __dccp_basic_hdr_len(dh);
307 static inline __u64 dccp_hdr_seq(const struct dccp_hdr *dh)
309 __u64 seq_nr = ntohs(dh->dccph_seq);
311 if (dh->dccph_x != 0)
312 seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(dh)->dccph_seq_low);
314 seq_nr += (u32)dh->dccph_seq2 << 16;
319 static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb)
321 return (struct dccp_hdr_request *)(skb_transport_header(skb) +
322 dccp_basic_hdr_len(skb));
325 static inline struct dccp_hdr_ack_bits *dccp_hdr_ack_bits(const struct sk_buff *skb)
327 return (struct dccp_hdr_ack_bits *)(skb_transport_header(skb) +
328 dccp_basic_hdr_len(skb));
331 static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb)
333 const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb);
334 return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) + ntohl(dhack->dccph_ack_nr_low);
337 static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb)
339 return (struct dccp_hdr_response *)(skb_transport_header(skb) +
340 dccp_basic_hdr_len(skb));
343 static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb)
345 return (struct dccp_hdr_reset *)(skb_transport_header(skb) +
346 dccp_basic_hdr_len(skb));
349 static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh)
351 return __dccp_basic_hdr_len(dh) +
352 dccp_packet_hdr_len(dh->dccph_type);
355 static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
357 return __dccp_hdr_len(dccp_hdr(skb));
361 * struct dccp_request_sock - represent DCCP-specific connection request
362 * @dreq_inet_rsk: structure inherited from
363 * @dreq_iss: initial sequence number sent on the Response (RFC 4340, 7.1)
364 * @dreq_isr: initial sequence number received on the Request
365 * @dreq_service: service code present on the Request (there is just one)
366 * @dreq_featneg: feature negotiation options for this connection
367 * The following two fields are analogous to the ones in dccp_sock:
368 * @dreq_timestamp_echo: last received timestamp to echo (13.1)
369 * @dreq_timestamp_echo: the time of receiving the last @dreq_timestamp_echo
371 struct dccp_request_sock {
372 struct inet_request_sock dreq_inet_rsk;
376 struct list_head dreq_featneg;
377 __u32 dreq_timestamp_echo;
378 __u32 dreq_timestamp_time;
381 static inline struct dccp_request_sock *dccp_rsk(const struct request_sock *req)
383 return (struct dccp_request_sock *)req;
386 extern struct inet_timewait_death_row dccp_death_row;
388 extern int dccp_parse_options(struct sock *sk, struct dccp_request_sock *dreq,
389 struct sk_buff *skb);
391 struct dccp_options_received {
393 u32 dccpor_timestamp;
394 u32 dccpor_timestamp_echo;
395 u32 dccpor_elapsed_time;
407 struct dccp_service_list {
409 __be32 dccpsl_list[0];
412 #define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1)
413 #define DCCP_SERVICE_CODE_IS_ABSENT 0
415 static inline int dccp_list_has_service(const struct dccp_service_list *sl,
416 const __be32 service)
418 if (likely(sl != NULL)) {
419 u32 i = sl->dccpsl_nr;
421 if (sl->dccpsl_list[i] == service)
430 * struct dccp_sock - DCCP socket state
432 * @dccps_swl - sequence number window low
433 * @dccps_swh - sequence number window high
434 * @dccps_awl - acknowledgement number window low
435 * @dccps_awh - acknowledgement number window high
436 * @dccps_iss - initial sequence number sent
437 * @dccps_isr - initial sequence number received
438 * @dccps_osr - first OPEN sequence number received
439 * @dccps_gss - greatest sequence number sent
440 * @dccps_gsr - greatest valid sequence number received
441 * @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss
442 * @dccps_service - first (passive sock) or unique (active sock) service code
443 * @dccps_service_list - second .. last service code on passive socket
444 * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
445 * @dccps_timestamp_time - time of receiving latest @dccps_timestamp_echo
446 * @dccps_l_ack_ratio - feature-local Ack Ratio
447 * @dccps_r_ack_ratio - feature-remote Ack Ratio
448 * @dccps_l_seq_win - local Sequence Window (influences ack number validity)
449 * @dccps_r_seq_win - remote Sequence Window (influences seq number validity)
450 * @dccps_pcslen - sender partial checksum coverage (via sockopt)
451 * @dccps_pcrlen - receiver partial checksum coverage (via sockopt)
452 * @dccps_send_ndp_count - local Send NDP Count feature (7.7.2)
453 * @dccps_ndp_count - number of Non Data Packets since last data packet
454 * @dccps_mss_cache - current value of MSS (path MTU minus header sizes)
455 * @dccps_rate_last - timestamp for rate-limiting DCCP-Sync (RFC 4340, 7.5.4)
456 * @dccps_featneg - tracks feature-negotiation state (mostly during handshake)
457 * @dccps_hc_rx_ackvec - rx half connection ack vector
458 * @dccps_hc_rx_ccid - CCID used for the receiver (or receiving half-connection)
459 * @dccps_hc_tx_ccid - CCID used for the sender (or sending half-connection)
460 * @dccps_options_received - parsed set of retrieved options
461 * @dccps_role - role of this sock, one of %dccp_role
462 * @dccps_hc_rx_insert_options - receiver wants to add options when acking
463 * @dccps_hc_tx_insert_options - sender wants to add options when sending
464 * @dccps_server_timewait - server holds timewait state on close (RFC 4340, 8.3)
465 * @dccps_xmitlet - tasklet scheduled by the TX CCID to dequeue data packets
466 * @dccps_xmit_timer - used by the TX CCID to delay sending (rate-based pacing)
467 * @dccps_syn_rtt - RTT sample from Request/Response exchange (in usecs)
470 /* inet_connection_sock has to be the first member of dccp_sock */
471 struct inet_connection_sock dccps_inet_connection;
472 #define dccps_syn_rtt dccps_inet_connection.icsk_ack.lrcvtime
483 __be32 dccps_service;
484 __u32 dccps_mss_cache;
485 struct dccp_service_list *dccps_service_list;
486 __u32 dccps_timestamp_echo;
487 __u32 dccps_timestamp_time;
488 __u16 dccps_l_ack_ratio;
489 __u16 dccps_r_ack_ratio;
490 __u64 dccps_l_seq_win:48;
491 __u64 dccps_r_seq_win:48;
494 __u8 dccps_send_ndp_count:1;
495 __u64 dccps_ndp_count:48;
496 unsigned long dccps_rate_last;
497 struct list_head dccps_featneg;
498 struct dccp_ackvec *dccps_hc_rx_ackvec;
499 struct ccid *dccps_hc_rx_ccid;
500 struct ccid *dccps_hc_tx_ccid;
501 struct dccp_options_received dccps_options_received;
502 enum dccp_role dccps_role:2;
503 __u8 dccps_hc_rx_insert_options:1;
504 __u8 dccps_hc_tx_insert_options:1;
505 __u8 dccps_server_timewait:1;
506 struct tasklet_struct dccps_xmitlet;
507 struct timer_list dccps_xmit_timer;
510 static inline struct dccp_sock *dccp_sk(const struct sock *sk)
512 return (struct dccp_sock *)sk;
515 static inline const char *dccp_role(const struct sock *sk)
517 switch (dccp_sk(sk)->dccps_role) {
518 case DCCP_ROLE_UNDEFINED: return "undefined";
519 case DCCP_ROLE_LISTEN: return "listen";
520 case DCCP_ROLE_SERVER: return "server";
521 case DCCP_ROLE_CLIENT: return "client";
526 #endif /* __KERNEL__ */
528 #endif /* _LINUX_DCCP_H */