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"
34 #if defined(__LITTLE_ENDIAN_BITFIELD)
39 #elif defined(__BIG_ENDIAN_BITFIELD)
40 __u32 dccph_reserved:3,
45 #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 - Conection initiation request header
61 * @dccph_req_service - Service to which the client app wants to connect
62 * @dccph_req_options - list of options (must be a multiple of 32 bits
64 struct dccp_hdr_request {
65 __u32 dccph_req_service;
68 * struct dccp_hdr_ack_bits - acknowledgment bits common to most packets
70 * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR
71 * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR
73 struct dccp_hdr_ack_bits {
74 __u32 dccph_reserved1:8,
76 __u32 dccph_ack_nr_low;
79 * struct dccp_hdr_response - Conection initiation response header
81 * @dccph_resp_ack_nr_high - 48 bit ack number high order bits, contains GSR
82 * @dccph_resp_ack_nr_low - 48 bit ack number low order bits, contains GSR
83 * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
84 * @dccph_resp_options - list of options (must be a multiple of 32 bits
86 struct dccp_hdr_response {
87 struct dccp_hdr_ack_bits dccph_resp_ack;
88 __u32 dccph_resp_service;
92 * struct dccp_hdr_reset - Unconditionally shut down a connection
94 * @dccph_reset_service - Echoes the Service Code on a received DCCP-Request
95 * @dccph_reset_options - list of options (must be a multiple of 32 bits
97 struct dccp_hdr_reset {
98 struct dccp_hdr_ack_bits dccph_reset_ack;
99 __u8 dccph_reset_code,
104 DCCP_PKT_REQUEST = 0,
117 #define DCCP_NR_PKT_TYPES DCCP_PKT_INVALID
119 static inline unsigned int dccp_packet_hdr_len(const __u8 type)
121 if (type == DCCP_PKT_DATA)
123 if (type == DCCP_PKT_DATAACK ||
124 type == DCCP_PKT_ACK ||
125 type == DCCP_PKT_SYNC ||
126 type == DCCP_PKT_SYNCACK ||
127 type == DCCP_PKT_CLOSE ||
128 type == DCCP_PKT_CLOSEREQ)
129 return sizeof(struct dccp_hdr_ack_bits);
130 if (type == DCCP_PKT_REQUEST)
131 return sizeof(struct dccp_hdr_request);
132 if (type == DCCP_PKT_RESPONSE)
133 return sizeof(struct dccp_hdr_response);
134 return sizeof(struct dccp_hdr_reset);
136 enum dccp_reset_codes {
137 DCCP_RESET_CODE_UNSPECIFIED = 0,
138 DCCP_RESET_CODE_CLOSED,
139 DCCP_RESET_CODE_ABORTED,
140 DCCP_RESET_CODE_NO_CONNECTION,
141 DCCP_RESET_CODE_PACKET_ERROR,
142 DCCP_RESET_CODE_OPTION_ERROR,
143 DCCP_RESET_CODE_MANDATORY_ERROR,
144 DCCP_RESET_CODE_CONNECTION_REFUSED,
145 DCCP_RESET_CODE_BAD_SERVICE_CODE,
146 DCCP_RESET_CODE_TOO_BUSY,
147 DCCP_RESET_CODE_BAD_INIT_COOKIE,
148 DCCP_RESET_CODE_AGGRESSION_PENALTY,
155 DCCPO_MIN_RESERVED = 3,
156 DCCPO_MAX_RESERVED = 31,
157 DCCPO_NDP_COUNT = 37,
158 DCCPO_ACK_VECTOR_0 = 38,
159 DCCPO_ACK_VECTOR_1 = 39,
160 DCCPO_TIMESTAMP = 41,
161 DCCPO_TIMESTAMP_ECHO = 42,
162 DCCPO_ELAPSED_TIME = 43,
164 DCCPO_MIN_CCID_SPECIFIC = 128,
165 DCCPO_MAX_CCID_SPECIFIC = 255,
171 DCCPF_SEQUENCE_WINDOW = 3,
172 DCCPF_SEND_ACK_VECTOR = 6,
173 DCCPF_SEND_NDP_COUNT = 7,
174 /* 10-127 reserved */
175 DCCPF_MIN_CCID_SPECIFIC = 128,
176 DCCPF_MAX_CCID_SPECIFIC = 255,
179 /* DCCP socket options */
180 #define DCCP_SOCKOPT_PACKET_SIZE 1
181 #define DCCP_SOCKOPT_SERVICE 2
183 #define DCCP_SERVICE_LIST_MAX_LEN 32
187 #include <linux/in.h>
188 #include <linux/list.h>
189 #include <linux/uio.h>
190 #include <linux/workqueue.h>
192 #include <net/inet_connection_sock.h>
193 #include <net/inet_timewait_sock.h>
194 #include <net/sock.h>
195 #include <net/tcp_states.h>
199 DCCP_OPEN = TCP_ESTABLISHED,
200 DCCP_REQUESTING = TCP_SYN_SENT,
201 DCCP_PARTOPEN = TCP_FIN_WAIT1, /* FIXME:
202 This mapping is horrible, but TCP has
203 no matching state for DCCP_PARTOPEN,
204 as TCP_SYN_RECV is already used by
205 DCCP_RESPOND, why don't stop using TCP
206 mapping of states? OK, now we don't use
207 sk_stream_sendmsg anymore, so doesn't
208 seem to exist any reason for us to
209 do the TCP mapping here */
210 DCCP_LISTEN = TCP_LISTEN,
211 DCCP_RESPOND = TCP_SYN_RECV,
212 DCCP_CLOSING = TCP_CLOSING,
213 DCCP_TIME_WAIT = TCP_TIME_WAIT,
214 DCCP_CLOSED = TCP_CLOSE,
215 DCCP_MAX_STATES = TCP_MAX_STATES,
218 #define DCCP_STATE_MASK 0xf
219 #define DCCP_ACTION_FIN (1<<7)
222 DCCPF_OPEN = TCPF_ESTABLISHED,
223 DCCPF_REQUESTING = TCPF_SYN_SENT,
224 DCCPF_PARTOPEN = TCPF_FIN_WAIT1,
225 DCCPF_LISTEN = TCPF_LISTEN,
226 DCCPF_RESPOND = TCPF_SYN_RECV,
227 DCCPF_CLOSING = TCPF_CLOSING,
228 DCCPF_TIME_WAIT = TCPF_TIME_WAIT,
229 DCCPF_CLOSED = TCPF_CLOSE,
232 static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb)
234 return (struct dccp_hdr *)skb->h.raw;
237 static inline struct dccp_hdr_ext *dccp_hdrx(const struct sk_buff *skb)
239 return (struct dccp_hdr_ext *)(skb->h.raw + sizeof(struct dccp_hdr));
242 static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh)
244 return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);
247 static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)
249 const struct dccp_hdr *dh = dccp_hdr(skb);
250 return __dccp_basic_hdr_len(dh);
253 static inline __u64 dccp_hdr_seq(const struct sk_buff *skb)
255 const struct dccp_hdr *dh = dccp_hdr(skb);
256 #if defined(__LITTLE_ENDIAN_BITFIELD)
257 __u64 seq_nr = ntohl(dh->dccph_seq << 8);
258 #elif defined(__BIG_ENDIAN_BITFIELD)
259 __u64 seq_nr = ntohl(dh->dccph_seq);
261 #error "Adjust your <asm/byteorder.h> defines"
264 if (dh->dccph_x != 0)
265 seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(skb)->dccph_seq_low);
270 static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb)
272 return (struct dccp_hdr_request *)(skb->h.raw + dccp_basic_hdr_len(skb));
275 static inline struct dccp_hdr_ack_bits *dccp_hdr_ack_bits(const struct sk_buff *skb)
277 return (struct dccp_hdr_ack_bits *)(skb->h.raw + dccp_basic_hdr_len(skb));
280 static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb)
282 const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb);
283 #if defined(__LITTLE_ENDIAN_BITFIELD)
284 return (((u64)ntohl(dhack->dccph_ack_nr_high << 8)) << 32) + ntohl(dhack->dccph_ack_nr_low);
285 #elif defined(__BIG_ENDIAN_BITFIELD)
286 return (((u64)ntohl(dhack->dccph_ack_nr_high)) << 32) + ntohl(dhack->dccph_ack_nr_low);
288 #error "Adjust your <asm/byteorder.h> defines"
292 static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb)
294 return (struct dccp_hdr_response *)(skb->h.raw + dccp_basic_hdr_len(skb));
297 static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb)
299 return (struct dccp_hdr_reset *)(skb->h.raw + dccp_basic_hdr_len(skb));
302 static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh)
304 return __dccp_basic_hdr_len(dh) +
305 dccp_packet_hdr_len(dh->dccph_type);
308 static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
310 return __dccp_hdr_len(dccp_hdr(skb));
314 /* initial values for each feature */
315 #define DCCPF_INITIAL_SEQUENCE_WINDOW 100
316 /* FIXME: for now we're using CCID 3 (TFRC) */
317 #define DCCPF_INITIAL_CCID 3
318 #define DCCPF_INITIAL_SEND_ACK_VECTOR 0
319 /* FIXME: for now we're default to 1 but it should really be 0 */
320 #define DCCPF_INITIAL_SEND_NDP_COUNT 1
322 #define DCCP_NDP_LIMIT 0xFFFFFF
325 * struct dccp_options - option values for a DCCP connection
326 * @dccpo_sequence_window - Sequence Window Feature (section 7.5.2)
327 * @dccpo_ccid - Congestion Control Id (CCID) (section 10)
328 * @dccpo_send_ack_vector - Send Ack Vector Feature (section 11.5)
329 * @dccpo_send_ndp_count - Send NDP Count Feature (7.7.2)
331 struct dccp_options {
332 __u64 dccpo_sequence_window;
334 __u8 dccpo_send_ack_vector;
335 __u8 dccpo_send_ndp_count;
338 extern void __dccp_options_init(struct dccp_options *dccpo);
339 extern void dccp_options_init(struct dccp_options *dccpo);
340 extern int dccp_parse_options(struct sock *sk, struct sk_buff *skb);
342 struct dccp_request_sock {
343 struct inet_request_sock dreq_inet_rsk;
349 static inline struct dccp_request_sock *dccp_rsk(const struct request_sock *req)
351 return (struct dccp_request_sock *)req;
354 extern struct inet_timewait_death_row dccp_death_row;
356 /* Read about the ECN nonce to see why it is 253 */
357 #define DCCP_MAX_ACK_VECTOR_LEN 253
359 struct dccp_options_received {
361 dccpor_ack_vector_len:8;
362 u32 dccpor_ack_vector_idx:10;
363 /* 22 bits hole, try to pack */
364 u32 dccpor_timestamp;
365 u32 dccpor_timestamp_echo;
366 u32 dccpor_elapsed_time;
378 struct dccp_service_list {
380 __u32 dccpsl_list[0];
383 #define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1)
385 static inline int dccp_list_has_service(const struct dccp_service_list *sl,
388 if (likely(sl != NULL)) {
389 u32 i = sl->dccpsl_nr;
391 if (sl->dccpsl_list[i] == service)
398 * struct dccp_sock - DCCP socket state
400 * @dccps_swl - sequence number window low
401 * @dccps_swh - sequence number window high
402 * @dccps_awl - acknowledgement number window low
403 * @dccps_awh - acknowledgement number window high
404 * @dccps_iss - initial sequence number sent
405 * @dccps_isr - initial sequence number received
406 * @dccps_osr - first OPEN sequence number received
407 * @dccps_gss - greatest sequence number sent
408 * @dccps_gsr - greatest valid sequence number received
409 * @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss
410 * @dccps_timestamp_time - time of latest TIMESTAMP option
411 * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
412 * @dccps_ext_header_len - network protocol overhead (IP/IPv6 options)
413 * @dccps_pmtu_cookie - Last pmtu seen by socket
414 * @dccps_packet_size - Set thru setsockopt
415 * @dccps_role - Role of this sock, one of %dccp_role
416 * @dccps_ndp_count - number of Non Data Packets since last data packet
417 * @dccps_hc_rx_ackpkts - receiver half connection acked packets
420 /* inet_connection_sock has to be the first member of dccp_sock */
421 struct inet_connection_sock dccps_inet_connection;
433 struct dccp_service_list *dccps_service_list;
434 struct timeval dccps_timestamp_time;
435 __u32 dccps_timestamp_echo;
436 __u32 dccps_packet_size;
437 unsigned long dccps_ndp_count;
438 __u16 dccps_ext_header_len;
439 __u32 dccps_pmtu_cookie;
440 __u32 dccps_mss_cache;
441 struct dccp_options dccps_options;
442 struct dccp_ackpkts *dccps_hc_rx_ackpkts;
443 void *dccps_hc_rx_ccid_private;
444 void *dccps_hc_tx_ccid_private;
445 struct ccid *dccps_hc_rx_ccid;
446 struct ccid *dccps_hc_tx_ccid;
447 struct dccp_options_received dccps_options_received;
448 struct timeval dccps_epoch;
449 enum dccp_role dccps_role:2;
450 __u8 dccps_hc_rx_insert_options:1;
451 __u8 dccps_hc_tx_insert_options:1;
454 static inline struct dccp_sock *dccp_sk(const struct sock *sk)
456 return (struct dccp_sock *)sk;
459 static inline int dccp_service_not_initialized(const struct sock *sk)
461 return dccp_sk(sk)->dccps_service == DCCP_SERVICE_INVALID_VALUE;
464 static inline const char *dccp_role(const struct sock *sk)
466 switch (dccp_sk(sk)->dccps_role) {
467 case DCCP_ROLE_UNDEFINED: return "undefined";
468 case DCCP_ROLE_LISTEN: return "listen";
469 case DCCP_ROLE_SERVER: return "server";
470 case DCCP_ROLE_CLIENT: return "client";
475 #endif /* __KERNEL__ */
477 #endif /* _LINUX_DCCP_H */