4 #include <linux/types.h>
5 #include <asm/byteorder.h>
7 /* Structure describing an Internet (DCCP) socket address. */
9 __u16 sdccp_family
; /* Address family */
10 __u16 sdccp_port
; /* Port number */
11 __u32 sdccp_addr
; /* Internet address */
12 __u32 sdccp_service
; /* Service */
13 /* Pad to size of `struct sockaddr': 16 bytes . */
18 * struct dccp_hdr - generic part of DCCP packet header
20 * @dccph_sport - Relevant port on the endpoint that sent this packet
21 * @dccph_dport - Relevant port on the other endpoint
22 * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words
23 * @dccph_ccval - Used by the HC-Sender CCID
24 * @dccph_cscov - Parts of the packet that are covered by the Checksum field
25 * @dccph_checksum - Internet checksum, depends on dccph_cscov
26 * @dccph_x - 0 = 24 bit sequence number, 1 = 48
27 * @dccph_type - packet type, see DCCP_PKT_ prefixed macros
28 * @dccph_seq - sequence number high or low order 24 bits, depends on dccph_x
34 #if defined(__LITTLE_ENDIAN_BITFIELD)
37 #elif defined(__BIG_ENDIAN_BITFIELD)
41 #error "Adjust your <asm/byteorder.h> defines"
44 #if defined(__LITTLE_ENDIAN_BITFIELD)
49 #elif defined(__BIG_ENDIAN_BITFIELD)
50 __u32 dccph_reserved
:3,
55 #error "Adjust your <asm/byteorder.h> defines"
60 * struct dccp_hdr_ext - the low bits of a 48 bit seq packet
62 * @dccph_seq_low - low 24 bits of a 48 bit seq packet
69 * struct dccp_hdr_request - Conection initiation request header
71 * @dccph_req_service - Service to which the client app wants to connect
72 * @dccph_req_options - list of options (must be a multiple of 32 bits
74 struct dccp_hdr_request
{
75 __u32 dccph_req_service
;
78 * struct dccp_hdr_ack_bits - acknowledgment bits common to most packets
80 * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR
81 * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR
83 struct dccp_hdr_ack_bits
{
84 __u32 dccph_reserved1
:8,
86 __u32 dccph_ack_nr_low
;
89 * struct dccp_hdr_response - Conection initiation response header
91 * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR
92 * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR
93 * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
94 * @dccph_resp_options - list of options (must be a multiple of 32 bits
96 struct dccp_hdr_response
{
97 struct dccp_hdr_ack_bits dccph_resp_ack
;
98 __u32 dccph_resp_service
;
102 * struct dccp_hdr_reset - Unconditionally shut down a connection
104 * @dccph_reset_service - Echoes the Service Code on a received DCCP-Request
105 * @dccph_reset_options - list of options (must be a multiple of 32 bits
107 struct dccp_hdr_reset
{
108 struct dccp_hdr_ack_bits dccph_reset_ack
;
109 __u8 dccph_reset_code
,
114 DCCP_PKT_REQUEST
= 0,
127 #define DCCP_NR_PKT_TYPES DCCP_PKT_INVALID
129 static inline unsigned int dccp_packet_hdr_len(const __u8 type
)
131 if (type
== DCCP_PKT_DATA
)
133 if (type
== DCCP_PKT_DATAACK
||
134 type
== DCCP_PKT_ACK
||
135 type
== DCCP_PKT_SYNC
||
136 type
== DCCP_PKT_SYNCACK
||
137 type
== DCCP_PKT_CLOSE
||
138 type
== DCCP_PKT_CLOSEREQ
)
139 return sizeof(struct dccp_hdr_ack_bits
);
140 if (type
== DCCP_PKT_REQUEST
)
141 return sizeof(struct dccp_hdr_request
);
142 if (type
== DCCP_PKT_RESPONSE
)
143 return sizeof(struct dccp_hdr_response
);
144 return sizeof(struct dccp_hdr_reset
);
146 enum dccp_reset_codes
{
147 DCCP_RESET_CODE_UNSPECIFIED
= 0,
148 DCCP_RESET_CODE_CLOSED
,
149 DCCP_RESET_CODE_ABORTED
,
150 DCCP_RESET_CODE_NO_CONNECTION
,
151 DCCP_RESET_CODE_PACKET_ERROR
,
152 DCCP_RESET_CODE_OPTION_ERROR
,
153 DCCP_RESET_CODE_MANDATORY_ERROR
,
154 DCCP_RESET_CODE_CONNECTION_REFUSED
,
155 DCCP_RESET_CODE_BAD_SERVICE_CODE
,
156 DCCP_RESET_CODE_TOO_BUSY
,
157 DCCP_RESET_CODE_BAD_INIT_COOKIE
,
158 DCCP_RESET_CODE_AGGRESSION_PENALTY
,
165 DCCPO_MIN_RESERVED
= 3,
166 DCCPO_MAX_RESERVED
= 31,
167 DCCPO_NDP_COUNT
= 37,
168 DCCPO_ACK_VECTOR_0
= 38,
169 DCCPO_ACK_VECTOR_1
= 39,
170 DCCPO_TIMESTAMP
= 41,
171 DCCPO_TIMESTAMP_ECHO
= 42,
172 DCCPO_ELAPSED_TIME
= 43,
174 DCCPO_MIN_CCID_SPECIFIC
= 128,
175 DCCPO_MAX_CCID_SPECIFIC
= 255,
181 DCCPF_SEQUENCE_WINDOW
= 3,
182 DCCPF_SEND_ACK_VECTOR
= 6,
183 DCCPF_SEND_NDP_COUNT
= 7,
184 /* 10-127 reserved */
185 DCCPF_MIN_CCID_SPECIFIC
= 128,
186 DCCPF_MAX_CCID_SPECIFIC
= 255,
191 #include <linux/in.h>
192 #include <linux/list.h>
193 #include <linux/uio.h>
194 #include <linux/workqueue.h>
196 #include <net/inet_connection_sock.h>
197 #include <net/inet_timewait_sock.h>
198 #include <net/sock.h>
199 #include <net/tcp_states.h>
203 DCCP_OPEN
= TCP_ESTABLISHED
,
204 DCCP_REQUESTING
= TCP_SYN_SENT
,
205 DCCP_PARTOPEN
= TCP_FIN_WAIT1
, /* FIXME:
206 This mapping is horrible, but TCP has
207 no matching state for DCCP_PARTOPEN,
208 as TCP_SYN_RECV is already used by
209 DCCP_RESPOND, why don't stop using TCP
210 mapping of states? OK, now we don't use
211 sk_stream_sendmsg anymore, so doesn't
212 seem to exist any reason for us to
213 do the TCP mapping here */
214 DCCP_LISTEN
= TCP_LISTEN
,
215 DCCP_RESPOND
= TCP_SYN_RECV
,
216 DCCP_CLOSING
= TCP_CLOSING
,
217 DCCP_TIME_WAIT
= TCP_TIME_WAIT
,
218 DCCP_CLOSED
= TCP_CLOSE
,
219 DCCP_MAX_STATES
= TCP_MAX_STATES
,
222 #define DCCP_STATE_MASK 0xf
223 #define DCCP_ACTION_FIN (1<<7)
226 DCCPF_OPEN
= TCPF_ESTABLISHED
,
227 DCCPF_REQUESTING
= TCPF_SYN_SENT
,
228 DCCPF_PARTOPEN
= TCPF_FIN_WAIT1
,
229 DCCPF_LISTEN
= TCPF_LISTEN
,
230 DCCPF_RESPOND
= TCPF_SYN_RECV
,
231 DCCPF_CLOSING
= TCPF_CLOSING
,
232 DCCPF_TIME_WAIT
= TCPF_TIME_WAIT
,
233 DCCPF_CLOSED
= TCPF_CLOSE
,
236 static inline struct dccp_hdr
*dccp_hdr(const struct sk_buff
*skb
)
238 return (struct dccp_hdr
*)skb
->h
.raw
;
241 static inline struct dccp_hdr_ext
*dccp_hdrx(const struct sk_buff
*skb
)
243 return (struct dccp_hdr_ext
*)(skb
->h
.raw
+ sizeof(struct dccp_hdr
));
246 static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr
*dh
)
248 return sizeof(*dh
) + (dh
->dccph_x
? sizeof(struct dccp_hdr_ext
) : 0);
251 static inline unsigned int dccp_basic_hdr_len(const struct sk_buff
*skb
)
253 const struct dccp_hdr
*dh
= dccp_hdr(skb
);
254 return __dccp_basic_hdr_len(dh
);
257 static inline __u64
dccp_hdr_seq(const struct sk_buff
*skb
)
259 const struct dccp_hdr
*dh
= dccp_hdr(skb
);
260 #if defined(__LITTLE_ENDIAN_BITFIELD)
261 __u64 seq_nr
= ntohl(dh
->dccph_seq
<< 8);
262 #elif defined(__BIG_ENDIAN_BITFIELD)
263 __u64 seq_nr
= ntohl(dh
->dccph_seq
);
265 #error "Adjust your <asm/byteorder.h> defines"
268 if (dh
->dccph_x
!= 0)
269 seq_nr
= (seq_nr
<< 32) + ntohl(dccp_hdrx(skb
)->dccph_seq_low
);
274 static inline struct dccp_hdr_request
*dccp_hdr_request(struct sk_buff
*skb
)
276 return (struct dccp_hdr_request
*)(skb
->h
.raw
+ dccp_basic_hdr_len(skb
));
279 static inline struct dccp_hdr_ack_bits
*dccp_hdr_ack_bits(const struct sk_buff
*skb
)
281 return (struct dccp_hdr_ack_bits
*)(skb
->h
.raw
+ dccp_basic_hdr_len(skb
));
284 static inline u64
dccp_hdr_ack_seq(const struct sk_buff
*skb
)
286 const struct dccp_hdr_ack_bits
*dhack
= dccp_hdr_ack_bits(skb
);
287 #if defined(__LITTLE_ENDIAN_BITFIELD)
288 return (((u64
)ntohl(dhack
->dccph_ack_nr_high
<< 8)) << 32) + ntohl(dhack
->dccph_ack_nr_low
);
289 #elif defined(__BIG_ENDIAN_BITFIELD)
290 return (((u64
)ntohl(dhack
->dccph_ack_nr_high
)) << 32) + ntohl(dhack
->dccph_ack_nr_low
);
292 #error "Adjust your <asm/byteorder.h> defines"
296 static inline struct dccp_hdr_response
*dccp_hdr_response(struct sk_buff
*skb
)
298 return (struct dccp_hdr_response
*)(skb
->h
.raw
+ dccp_basic_hdr_len(skb
));
301 static inline struct dccp_hdr_reset
*dccp_hdr_reset(struct sk_buff
*skb
)
303 return (struct dccp_hdr_reset
*)(skb
->h
.raw
+ dccp_basic_hdr_len(skb
));
306 static inline unsigned int __dccp_hdr_len(const struct dccp_hdr
*dh
)
308 return __dccp_basic_hdr_len(dh
) +
309 dccp_packet_hdr_len(dh
->dccph_type
);
312 static inline unsigned int dccp_hdr_len(const struct sk_buff
*skb
)
314 return __dccp_hdr_len(dccp_hdr(skb
));
318 /* initial values for each feature */
319 #define DCCPF_INITIAL_SEQUENCE_WINDOW 100
320 /* FIXME: for now we're using CCID 3 (TFRC) */
321 #define DCCPF_INITIAL_CCID 3
322 #define DCCPF_INITIAL_SEND_ACK_VECTOR 0
323 /* FIXME: for now we're default to 1 but it should really be 0 */
324 #define DCCPF_INITIAL_SEND_NDP_COUNT 1
326 #define DCCP_NDP_LIMIT 0xFFFFFF
329 * struct dccp_options - option values for a DCCP connection
330 * @dccpo_sequence_window - Sequence Window Feature (section 7.5.2)
331 * @dccpo_ccid - Congestion Control Id (CCID) (section 10)
332 * @dccpo_send_ack_vector - Send Ack Vector Feature (section 11.5)
333 * @dccpo_send_ndp_count - Send NDP Count Feature (7.7.2)
335 struct dccp_options
{
336 __u64 dccpo_sequence_window
;
338 __u8 dccpo_send_ack_vector
;
339 __u8 dccpo_send_ndp_count
;
342 extern void __dccp_options_init(struct dccp_options
*dccpo
);
343 extern void dccp_options_init(struct dccp_options
*dccpo
);
344 extern int dccp_parse_options(struct sock
*sk
, struct sk_buff
*skb
);
346 struct dccp_request_sock
{
347 struct inet_request_sock dreq_inet_rsk
;
353 static inline struct dccp_request_sock
*dccp_rsk(const struct request_sock
*req
)
355 return (struct dccp_request_sock
*)req
;
358 extern struct inet_timewait_death_row dccp_death_row
;
360 /* Read about the ECN nonce to see why it is 253 */
361 #define DCCP_MAX_ACK_VECTOR_LEN 253
363 struct dccp_options_received
{
365 dccpor_ack_vector_len
:8;
366 u32 dccpor_ack_vector_idx
:10;
367 /* 22 bits hole, try to pack */
368 u32 dccpor_timestamp
;
369 u32 dccpor_timestamp_echo
;
370 u32 dccpor_elapsed_time
;
383 * struct dccp_sock - DCCP socket state
385 * @dccps_swl - sequence number window low
386 * @dccps_swh - sequence number window high
387 * @dccps_awl - acknowledgement number window low
388 * @dccps_awh - acknowledgement number window high
389 * @dccps_iss - initial sequence number sent
390 * @dccps_isr - initial sequence number received
391 * @dccps_osr - first OPEN sequence number received
392 * @dccps_gss - greatest sequence number sent
393 * @dccps_gsr - greatest valid sequence number received
394 * @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss
395 * @dccps_timestamp_time - time of latest TIMESTAMP option
396 * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
397 * @dccps_ext_header_len - network protocol overhead (IP/IPv6 options)
398 * @dccps_pmtu_cookie - Last pmtu seen by socket
399 * @dccps_avg_packet_size - FIXME: has to be set by the app thru some setsockopt or ioctl, CCID3 uses it
400 * @dccps_role - Role of this sock, one of %dccp_role
401 * @dccps_ndp_count - number of Non Data Packets since last data packet
402 * @dccps_hc_rx_ackpkts - receiver half connection acked packets
405 /* inet_connection_sock has to be the first member of dccp_sock */
406 struct inet_connection_sock dccps_inet_connection
;
417 unsigned long dccps_service
;
418 unsigned long dccps_timestamp_time
;
419 __u32 dccps_timestamp_echo
;
420 __u32 dccps_avg_packet_size
;
421 unsigned long dccps_ndp_count
;
422 __u16 dccps_ext_header_len
;
423 __u32 dccps_pmtu_cookie
;
424 __u32 dccps_mss_cache
;
425 struct dccp_options dccps_options
;
426 struct dccp_ackpkts
*dccps_hc_rx_ackpkts
;
427 void *dccps_hc_rx_ccid_private
;
428 void *dccps_hc_tx_ccid_private
;
429 struct ccid
*dccps_hc_rx_ccid
;
430 struct ccid
*dccps_hc_tx_ccid
;
431 struct dccp_options_received dccps_options_received
;
432 enum dccp_role dccps_role
:2;
435 static inline struct dccp_sock
*dccp_sk(const struct sock
*sk
)
437 return (struct dccp_sock
*)sk
;
440 static inline const char *dccp_role(const struct sock
*sk
)
442 switch (dccp_sk(sk
)->dccps_role
) {
443 case DCCP_ROLE_UNDEFINED
: return "undefined";
444 case DCCP_ROLE_LISTEN
: return "listen";
445 case DCCP_ROLE_SERVER
: return "server";
446 case DCCP_ROLE_CLIENT
: return "client";
451 #endif /* __KERNEL__ */
453 #endif /* _LINUX_DCCP_H */