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_pending - List of features being negotiated
374 struct dccp_minisock
{
375 __u64 dccpms_sequence_window
;
378 __u8 dccpms_send_ack_vector
;
379 __u8 dccpms_send_ndp_count
;
380 struct list_head dccpms_pending
;
381 struct list_head dccpms_conf
;
384 struct dccp_opt_conf
{
389 struct dccp_opt_pend
{
390 struct list_head dccpop_node
;
396 struct dccp_opt_conf
*dccpop_sc
;
399 extern void dccp_minisock_init(struct dccp_minisock
*dmsk
);
402 * struct dccp_request_sock - represent DCCP-specific connection request
403 * @dreq_inet_rsk: structure inherited from
404 * @dreq_iss: initial sequence number sent on the Response (RFC 4340, 7.1)
405 * @dreq_isr: initial sequence number received on the Request
406 * @dreq_service: service code present on the Request (there is just one)
407 * @dreq_featneg: feature negotiation options for this connection
408 * The following two fields are analogous to the ones in dccp_sock:
409 * @dreq_timestamp_echo: last received timestamp to echo (13.1)
410 * @dreq_timestamp_echo: the time of receiving the last @dreq_timestamp_echo
412 struct dccp_request_sock
{
413 struct inet_request_sock dreq_inet_rsk
;
417 struct list_head dreq_featneg
;
418 __u32 dreq_timestamp_echo
;
419 __u32 dreq_timestamp_time
;
422 static inline struct dccp_request_sock
*dccp_rsk(const struct request_sock
*req
)
424 return (struct dccp_request_sock
*)req
;
427 extern struct inet_timewait_death_row dccp_death_row
;
429 extern int dccp_parse_options(struct sock
*sk
, struct dccp_request_sock
*dreq
,
430 struct sk_buff
*skb
);
432 struct dccp_options_received
{
434 u32 dccpor_timestamp
;
435 u32 dccpor_timestamp_echo
;
436 u32 dccpor_elapsed_time
;
448 struct dccp_service_list
{
450 __be32 dccpsl_list
[0];
453 #define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1)
454 #define DCCP_SERVICE_CODE_IS_ABSENT 0
456 static inline int dccp_list_has_service(const struct dccp_service_list
*sl
,
457 const __be32 service
)
459 if (likely(sl
!= NULL
)) {
460 u32 i
= sl
->dccpsl_nr
;
462 if (sl
->dccpsl_list
[i
] == service
)
471 * struct dccp_sock - DCCP socket state
473 * @dccps_swl - sequence number window low
474 * @dccps_swh - sequence number window high
475 * @dccps_awl - acknowledgement number window low
476 * @dccps_awh - acknowledgement number window high
477 * @dccps_iss - initial sequence number sent
478 * @dccps_isr - initial sequence number received
479 * @dccps_osr - first OPEN sequence number received
480 * @dccps_gss - greatest sequence number sent
481 * @dccps_gsr - greatest valid sequence number received
482 * @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss
483 * @dccps_service - first (passive sock) or unique (active sock) service code
484 * @dccps_service_list - second .. last service code on passive socket
485 * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
486 * @dccps_timestamp_time - time of receiving latest @dccps_timestamp_echo
487 * @dccps_l_ack_ratio - feature-local Ack Ratio
488 * @dccps_r_ack_ratio - feature-remote Ack Ratio
489 * @dccps_pcslen - sender partial checksum coverage (via sockopt)
490 * @dccps_pcrlen - receiver partial checksum coverage (via sockopt)
491 * @dccps_ndp_count - number of Non Data Packets since last data packet
492 * @dccps_mss_cache - current value of MSS (path MTU minus header sizes)
493 * @dccps_rate_last - timestamp for rate-limiting DCCP-Sync (RFC 4340, 7.5.4)
494 * @dccps_minisock - associated minisock (accessed via dccp_msk)
495 * @dccps_featneg - tracks feature-negotiation state (mostly during handshake)
496 * @dccps_hc_rx_ackvec - rx half connection ack vector
497 * @dccps_hc_rx_ccid - CCID used for the receiver (or receiving half-connection)
498 * @dccps_hc_tx_ccid - CCID used for the sender (or sending half-connection)
499 * @dccps_options_received - parsed set of retrieved options
500 * @dccps_role - role of this sock, one of %dccp_role
501 * @dccps_hc_rx_insert_options - receiver wants to add options when acking
502 * @dccps_hc_tx_insert_options - sender wants to add options when sending
503 * @dccps_server_timewait - server holds timewait state on close (RFC 4340, 8.3)
504 * @dccps_xmit_timer - timer for when CCID is not ready to send
505 * @dccps_syn_rtt - RTT sample from Request/Response exchange (in usecs)
508 /* inet_connection_sock has to be the first member of dccp_sock */
509 struct inet_connection_sock dccps_inet_connection
;
510 #define dccps_syn_rtt dccps_inet_connection.icsk_ack.lrcvtime
521 __be32 dccps_service
;
522 __u32 dccps_mss_cache
;
523 struct dccp_service_list
*dccps_service_list
;
524 __u32 dccps_timestamp_echo
;
525 __u32 dccps_timestamp_time
;
526 __u16 dccps_l_ack_ratio
;
527 __u16 dccps_r_ack_ratio
;
530 __u64 dccps_ndp_count
:48;
531 unsigned long dccps_rate_last
;
532 struct dccp_minisock dccps_minisock
;
533 struct list_head dccps_featneg
;
534 struct dccp_ackvec
*dccps_hc_rx_ackvec
;
535 struct ccid
*dccps_hc_rx_ccid
;
536 struct ccid
*dccps_hc_tx_ccid
;
537 struct dccp_options_received dccps_options_received
;
538 enum dccp_role dccps_role
:2;
539 __u8 dccps_hc_rx_insert_options
:1;
540 __u8 dccps_hc_tx_insert_options
:1;
541 __u8 dccps_server_timewait
:1;
542 struct timer_list dccps_xmit_timer
;
545 static inline struct dccp_sock
*dccp_sk(const struct sock
*sk
)
547 return (struct dccp_sock
*)sk
;
550 static inline struct dccp_minisock
*dccp_msk(const struct sock
*sk
)
552 return (struct dccp_minisock
*)&dccp_sk(sk
)->dccps_minisock
;
555 static inline const char *dccp_role(const struct sock
*sk
)
557 switch (dccp_sk(sk
)->dccps_role
) {
558 case DCCP_ROLE_UNDEFINED
: return "undefined";
559 case DCCP_ROLE_LISTEN
: return "listen";
560 case DCCP_ROLE_SERVER
: return "server";
561 case DCCP_ROLE_CLIENT
: return "client";
566 #endif /* __KERNEL__ */
568 #endif /* _LINUX_DCCP_H */