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) */
182 DCCPF_SHORT_SEQNOS
= 2, /* XXX: not yet implemented */
183 DCCPF_SEQUENCE_WINDOW
= 3,
184 DCCPF_ECN_INCAPABLE
= 4, /* XXX: not yet implemented */
186 DCCPF_SEND_ACK_VECTOR
= 6,
187 DCCPF_SEND_NDP_COUNT
= 7,
188 DCCPF_MIN_CSUM_COVER
= 8,
189 DCCPF_DATA_CHECKSUM
= 9, /* XXX: not yet implemented */
190 /* 10-127 reserved */
191 DCCPF_MIN_CCID_SPECIFIC
= 128,
192 DCCPF_MAX_CCID_SPECIFIC
= 255,
195 /* this structure is argument to DCCP_SOCKOPT_CHANGE_X */
196 struct dccp_so_feat
{
198 __u8 __user
*dccpsf_val
;
202 /* DCCP socket options */
203 #define DCCP_SOCKOPT_PACKET_SIZE 1 /* XXX deprecated, without effect */
204 #define DCCP_SOCKOPT_SERVICE 2
205 #define DCCP_SOCKOPT_CHANGE_L 3
206 #define DCCP_SOCKOPT_CHANGE_R 4
207 #define DCCP_SOCKOPT_GET_CUR_MPS 5
208 #define DCCP_SOCKOPT_SEND_CSCOV 10
209 #define DCCP_SOCKOPT_RECV_CSCOV 11
210 #define DCCP_SOCKOPT_CCID_RX_INFO 128
211 #define DCCP_SOCKOPT_CCID_TX_INFO 192
213 /* maximum number of services provided on the same listening port */
214 #define DCCP_SERVICE_LIST_MAX_LEN 32
218 #include <linux/in.h>
219 #include <linux/ktime.h>
220 #include <linux/list.h>
221 #include <linux/uio.h>
222 #include <linux/workqueue.h>
224 #include <net/inet_connection_sock.h>
225 #include <net/inet_sock.h>
226 #include <net/inet_timewait_sock.h>
227 #include <net/tcp_states.h>
230 DCCP_OPEN
= TCP_ESTABLISHED
,
231 DCCP_REQUESTING
= TCP_SYN_SENT
,
232 DCCP_LISTEN
= TCP_LISTEN
,
233 DCCP_RESPOND
= TCP_SYN_RECV
,
234 DCCP_CLOSING
= TCP_CLOSING
,
235 DCCP_TIME_WAIT
= TCP_TIME_WAIT
,
236 DCCP_CLOSED
= TCP_CLOSE
,
237 DCCP_PARTOPEN
= TCP_MAX_STATES
,
241 #define DCCP_STATE_MASK 0xf
242 #define DCCP_ACTION_FIN (1<<7)
245 DCCPF_OPEN
= TCPF_ESTABLISHED
,
246 DCCPF_REQUESTING
= TCPF_SYN_SENT
,
247 DCCPF_LISTEN
= TCPF_LISTEN
,
248 DCCPF_RESPOND
= TCPF_SYN_RECV
,
249 DCCPF_CLOSING
= TCPF_CLOSING
,
250 DCCPF_TIME_WAIT
= TCPF_TIME_WAIT
,
251 DCCPF_CLOSED
= TCPF_CLOSE
,
252 DCCPF_PARTOPEN
= 1 << DCCP_PARTOPEN
,
255 static inline struct dccp_hdr
*dccp_hdr(const struct sk_buff
*skb
)
257 return (struct dccp_hdr
*)skb_transport_header(skb
);
260 static inline struct dccp_hdr
*dccp_zeroed_hdr(struct sk_buff
*skb
, int headlen
)
262 skb_push(skb
, headlen
);
263 skb_reset_transport_header(skb
);
264 return memset(skb_transport_header(skb
), 0, headlen
);
267 static inline struct dccp_hdr_ext
*dccp_hdrx(const struct dccp_hdr
*dh
)
269 return (struct dccp_hdr_ext
*)((unsigned char *)dh
+ sizeof(*dh
));
272 static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr
*dh
)
274 return sizeof(*dh
) + (dh
->dccph_x
? sizeof(struct dccp_hdr_ext
) : 0);
277 static inline unsigned int dccp_basic_hdr_len(const struct sk_buff
*skb
)
279 const struct dccp_hdr
*dh
= dccp_hdr(skb
);
280 return __dccp_basic_hdr_len(dh
);
283 static inline __u64
dccp_hdr_seq(const struct dccp_hdr
*dh
)
285 __u64 seq_nr
= ntohs(dh
->dccph_seq
);
287 if (dh
->dccph_x
!= 0)
288 seq_nr
= (seq_nr
<< 32) + ntohl(dccp_hdrx(dh
)->dccph_seq_low
);
290 seq_nr
+= (u32
)dh
->dccph_seq2
<< 16;
295 static inline struct dccp_hdr_request
*dccp_hdr_request(struct sk_buff
*skb
)
297 return (struct dccp_hdr_request
*)(skb_transport_header(skb
) +
298 dccp_basic_hdr_len(skb
));
301 static inline struct dccp_hdr_ack_bits
*dccp_hdr_ack_bits(const struct sk_buff
*skb
)
303 return (struct dccp_hdr_ack_bits
*)(skb_transport_header(skb
) +
304 dccp_basic_hdr_len(skb
));
307 static inline u64
dccp_hdr_ack_seq(const struct sk_buff
*skb
)
309 const struct dccp_hdr_ack_bits
*dhack
= dccp_hdr_ack_bits(skb
);
310 return ((u64
)ntohs(dhack
->dccph_ack_nr_high
) << 32) + ntohl(dhack
->dccph_ack_nr_low
);
313 static inline struct dccp_hdr_response
*dccp_hdr_response(struct sk_buff
*skb
)
315 return (struct dccp_hdr_response
*)(skb_transport_header(skb
) +
316 dccp_basic_hdr_len(skb
));
319 static inline struct dccp_hdr_reset
*dccp_hdr_reset(struct sk_buff
*skb
)
321 return (struct dccp_hdr_reset
*)(skb_transport_header(skb
) +
322 dccp_basic_hdr_len(skb
));
325 static inline unsigned int __dccp_hdr_len(const struct dccp_hdr
*dh
)
327 return __dccp_basic_hdr_len(dh
) +
328 dccp_packet_hdr_len(dh
->dccph_type
);
331 static inline unsigned int dccp_hdr_len(const struct sk_buff
*skb
)
333 return __dccp_hdr_len(dccp_hdr(skb
));
337 /* initial values for each feature */
338 #define DCCPF_INITIAL_SEQUENCE_WINDOW 100
339 #define DCCPF_INITIAL_ACK_RATIO 2
340 #define DCCPF_INITIAL_CCID DCCPC_CCID2
341 #define DCCPF_INITIAL_SEND_ACK_VECTOR 1
342 /* FIXME: for now we're default to 1 but it should really be 0 */
343 #define DCCPF_INITIAL_SEND_NDP_COUNT 1
345 #define DCCP_NDP_LIMIT 0xFFFFFF
348 * struct dccp_minisock - Minimal DCCP connection representation
350 * Will be used to pass the state from dccp_request_sock to dccp_sock.
352 * @dccpms_sequence_window - Sequence Window Feature (section 7.5.2)
353 * @dccpms_ccid - Congestion Control Id (CCID) (section 10)
354 * @dccpms_send_ack_vector - Send Ack Vector Feature (section 11.5)
355 * @dccpms_send_ndp_count - Send NDP Count Feature (7.7.2)
356 * @dccpms_ack_ratio - Ack Ratio Feature (section 11.3)
357 * @dccpms_pending - List of features being negotiated
360 struct dccp_minisock
{
361 __u64 dccpms_sequence_window
;
364 __u8 dccpms_send_ack_vector
;
365 __u8 dccpms_send_ndp_count
;
366 __u8 dccpms_ack_ratio
;
367 struct list_head dccpms_pending
;
368 struct list_head dccpms_conf
;
371 struct dccp_opt_conf
{
376 struct dccp_opt_pend
{
377 struct list_head dccpop_node
;
383 struct dccp_opt_conf
*dccpop_sc
;
386 extern void dccp_minisock_init(struct dccp_minisock
*dmsk
);
388 extern int dccp_parse_options(struct sock
*sk
, struct sk_buff
*skb
);
390 struct dccp_request_sock
{
391 struct inet_request_sock dreq_inet_rsk
;
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 struct dccp_options_received
{
405 u32 dccpor_ndp
; /* only 24 bits */
406 u32 dccpor_timestamp
;
407 u32 dccpor_timestamp_echo
;
408 u32 dccpor_elapsed_time
;
420 struct dccp_service_list
{
422 __be32 dccpsl_list
[0];
425 #define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1)
426 #define DCCP_SERVICE_CODE_IS_ABSENT 0
428 static inline int dccp_list_has_service(const struct dccp_service_list
*sl
,
429 const __be32 service
)
431 if (likely(sl
!= NULL
)) {
432 u32 i
= sl
->dccpsl_nr
;
434 if (sl
->dccpsl_list
[i
] == service
)
443 * struct dccp_sock - DCCP socket state
445 * @dccps_swl - sequence number window low
446 * @dccps_swh - sequence number window high
447 * @dccps_awl - acknowledgement number window low
448 * @dccps_awh - acknowledgement number window high
449 * @dccps_iss - initial sequence number sent
450 * @dccps_isr - initial sequence number received
451 * @dccps_osr - first OPEN sequence number received
452 * @dccps_gss - greatest sequence number sent
453 * @dccps_gsr - greatest valid sequence number received
454 * @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss
455 * @dccps_service - first (passive sock) or unique (active sock) service code
456 * @dccps_service_list - second .. last service code on passive socket
457 * @dccps_timestamp_time - time of latest TIMESTAMP option
458 * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
459 * @dccps_l_ack_ratio - feature-local Ack Ratio
460 * @dccps_r_ack_ratio - feature-remote Ack Ratio
461 * @dccps_pcslen - sender partial checksum coverage (via sockopt)
462 * @dccps_pcrlen - receiver partial checksum coverage (via sockopt)
463 * @dccps_ndp_count - number of Non Data Packets since last data packet
464 * @dccps_mss_cache - current value of MSS (path MTU minus header sizes)
465 * @dccps_rate_last - timestamp for rate-limiting DCCP-Sync (RFC 4340, 7.5.4)
466 * @dccps_minisock - associated minisock (accessed via dccp_msk)
467 * @dccps_hc_rx_ackvec - rx half connection ack vector
468 * @dccps_hc_rx_ccid - CCID used for the receiver (or receiving half-connection)
469 * @dccps_hc_tx_ccid - CCID used for the sender (or sending half-connection)
470 * @dccps_options_received - parsed set of retrieved options
471 * @dccps_role - role of this sock, one of %dccp_role
472 * @dccps_hc_rx_insert_options - receiver wants to add options when acking
473 * @dccps_hc_tx_insert_options - sender wants to add options when sending
474 * @dccps_xmit_timer - timer for when CCID is not ready to send
475 * @dccps_syn_rtt - RTT sample from Request/Response exchange (in usecs)
478 /* inet_connection_sock has to be the first member of dccp_sock */
479 struct inet_connection_sock dccps_inet_connection
;
480 #define dccps_syn_rtt dccps_inet_connection.icsk_ack.lrcvtime
491 __be32 dccps_service
;
492 struct dccp_service_list
*dccps_service_list
;
493 ktime_t dccps_timestamp_time
;
494 __u32 dccps_timestamp_echo
;
495 __u16 dccps_l_ack_ratio
;
496 __u16 dccps_r_ack_ratio
;
499 unsigned long dccps_ndp_count
;
500 __u32 dccps_mss_cache
;
501 unsigned long dccps_rate_last
;
502 struct dccp_minisock dccps_minisock
;
503 struct dccp_ackvec
*dccps_hc_rx_ackvec
;
504 struct ccid
*dccps_hc_rx_ccid
;
505 struct ccid
*dccps_hc_tx_ccid
;
506 struct dccp_options_received dccps_options_received
;
507 enum dccp_role dccps_role
:2;
508 __u8 dccps_hc_rx_insert_options
:1;
509 __u8 dccps_hc_tx_insert_options
:1;
510 struct timer_list dccps_xmit_timer
;
513 static inline struct dccp_sock
*dccp_sk(const struct sock
*sk
)
515 return (struct dccp_sock
*)sk
;
518 static inline struct dccp_minisock
*dccp_msk(const struct sock
*sk
)
520 return (struct dccp_minisock
*)&dccp_sk(sk
)->dccps_minisock
;
523 static inline const char *dccp_role(const struct sock
*sk
)
525 switch (dccp_sk(sk
)->dccps_role
) {
526 case DCCP_ROLE_UNDEFINED
: return "undefined";
527 case DCCP_ROLE_LISTEN
: return "listen";
528 case DCCP_ROLE_SERVER
: return "server";
529 case DCCP_ROLE_CLIENT
: return "client";
534 #endif /* __KERNEL__ */
536 #endif /* _LINUX_DCCP_H */