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)
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 - 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 __be32 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 __be16 dccph_reserved1;
75 __be16 dccph_ack_nr_high;
76 __be32 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 __be32 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,
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,
176 DCCPF_SEQUENCE_WINDOW = 3,
178 DCCPF_SEND_ACK_VECTOR = 6,
179 DCCPF_SEND_NDP_COUNT = 7,
180 /* 10-127 reserved */
181 DCCPF_MIN_CCID_SPECIFIC = 128,
182 DCCPF_MAX_CCID_SPECIFIC = 255,
185 /* this structure is argument to DCCP_SOCKOPT_CHANGE_X */
186 struct dccp_so_feat {
192 /* DCCP socket options */
193 #define DCCP_SOCKOPT_PACKET_SIZE 1
194 #define DCCP_SOCKOPT_SERVICE 2
195 #define DCCP_SOCKOPT_CHANGE_L 3
196 #define DCCP_SOCKOPT_CHANGE_R 4
197 #define DCCP_SOCKOPT_CCID_RX_INFO 128
198 #define DCCP_SOCKOPT_CCID_TX_INFO 192
200 #define DCCP_SERVICE_LIST_MAX_LEN 32
204 #include <linux/in.h>
205 #include <linux/list.h>
206 #include <linux/uio.h>
207 #include <linux/workqueue.h>
209 #include <net/inet_connection_sock.h>
210 #include <net/inet_sock.h>
211 #include <net/inet_timewait_sock.h>
212 #include <net/tcp_states.h>
215 DCCP_OPEN = TCP_ESTABLISHED,
216 DCCP_REQUESTING = TCP_SYN_SENT,
217 DCCP_PARTOPEN = TCP_FIN_WAIT1, /* FIXME:
218 This mapping is horrible, but TCP has
219 no matching state for DCCP_PARTOPEN,
220 as TCP_SYN_RECV is already used by
221 DCCP_RESPOND, why don't stop using TCP
222 mapping of states? OK, now we don't use
223 sk_stream_sendmsg anymore, so doesn't
224 seem to exist any reason for us to
225 do the TCP mapping here */
226 DCCP_LISTEN = TCP_LISTEN,
227 DCCP_RESPOND = TCP_SYN_RECV,
228 DCCP_CLOSING = TCP_CLOSING,
229 DCCP_TIME_WAIT = TCP_TIME_WAIT,
230 DCCP_CLOSED = TCP_CLOSE,
231 DCCP_MAX_STATES = TCP_MAX_STATES,
234 #define DCCP_STATE_MASK 0xf
235 #define DCCP_ACTION_FIN (1<<7)
238 DCCPF_OPEN = TCPF_ESTABLISHED,
239 DCCPF_REQUESTING = TCPF_SYN_SENT,
240 DCCPF_PARTOPEN = TCPF_FIN_WAIT1,
241 DCCPF_LISTEN = TCPF_LISTEN,
242 DCCPF_RESPOND = TCPF_SYN_RECV,
243 DCCPF_CLOSING = TCPF_CLOSING,
244 DCCPF_TIME_WAIT = TCPF_TIME_WAIT,
245 DCCPF_CLOSED = TCPF_CLOSE,
248 static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb)
250 return (struct dccp_hdr *)skb->h.raw;
253 static inline struct dccp_hdr_ext *dccp_hdrx(const struct sk_buff *skb)
255 return (struct dccp_hdr_ext *)(skb->h.raw + sizeof(struct dccp_hdr));
258 static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh)
260 return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);
263 static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)
265 const struct dccp_hdr *dh = dccp_hdr(skb);
266 return __dccp_basic_hdr_len(dh);
269 static inline __u64 dccp_hdr_seq(const struct sk_buff *skb)
271 const struct dccp_hdr *dh = dccp_hdr(skb);
272 __u64 seq_nr = ntohs(dh->dccph_seq);
274 if (dh->dccph_x != 0)
275 seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(skb)->dccph_seq_low);
277 seq_nr += (u32)dh->dccph_seq2 << 16;
282 static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb)
284 return (struct dccp_hdr_request *)(skb->h.raw + dccp_basic_hdr_len(skb));
287 static inline struct dccp_hdr_ack_bits *dccp_hdr_ack_bits(const struct sk_buff *skb)
289 return (struct dccp_hdr_ack_bits *)(skb->h.raw + dccp_basic_hdr_len(skb));
292 static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb)
294 const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb);
295 return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) + ntohl(dhack->dccph_ack_nr_low);
298 static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb)
300 return (struct dccp_hdr_response *)(skb->h.raw + dccp_basic_hdr_len(skb));
303 static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb)
305 return (struct dccp_hdr_reset *)(skb->h.raw + dccp_basic_hdr_len(skb));
308 static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh)
310 return __dccp_basic_hdr_len(dh) +
311 dccp_packet_hdr_len(dh->dccph_type);
314 static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
316 return __dccp_hdr_len(dccp_hdr(skb));
320 /* initial values for each feature */
321 #define DCCPF_INITIAL_SEQUENCE_WINDOW 100
322 #define DCCPF_INITIAL_ACK_RATIO 2
324 #if defined(CONFIG_IP_DCCP_CCID2) || defined(CONFIG_IP_DCCP_CCID2_MODULE)
325 #define DCCPF_INITIAL_CCID 2
326 #define DCCPF_INITIAL_SEND_ACK_VECTOR 1
327 #elif defined(CONFIG_IP_DCCP_CCID3) || defined(CONFIG_IP_DCCP_CCID3_MODULE)
328 #define DCCPF_INITIAL_CCID 3
329 #define DCCPF_INITIAL_SEND_ACK_VECTOR 0
331 #error "At least one CCID must be built as the default"
334 /* FIXME: for now we're default to 1 but it should really be 0 */
335 #define DCCPF_INITIAL_SEND_NDP_COUNT 1
337 #define DCCP_NDP_LIMIT 0xFFFFFF
340 * struct dccp_options - option values for a DCCP connection
341 * @dccpo_sequence_window - Sequence Window Feature (section 7.5.2)
342 * @dccpo_ccid - Congestion Control Id (CCID) (section 10)
343 * @dccpo_send_ack_vector - Send Ack Vector Feature (section 11.5)
344 * @dccpo_send_ndp_count - Send NDP Count Feature (7.7.2)
346 struct dccp_options {
347 __u64 dccpo_sequence_window;
350 __u8 dccpo_send_ack_vector;
351 __u8 dccpo_send_ndp_count;
352 __u8 dccpo_ack_ratio;
353 struct list_head dccpo_pending;
354 struct list_head dccpo_conf;
357 struct dccp_opt_conf {
362 struct dccp_opt_pend {
363 struct list_head dccpop_node;
369 struct dccp_opt_conf *dccpop_sc;
372 extern void __dccp_options_init(struct dccp_options *dccpo);
373 extern void dccp_options_init(struct dccp_options *dccpo);
374 extern int dccp_parse_options(struct sock *sk, struct sk_buff *skb);
376 struct dccp_request_sock {
377 struct inet_request_sock dreq_inet_rsk;
383 static inline struct dccp_request_sock *dccp_rsk(const struct request_sock *req)
385 return (struct dccp_request_sock *)req;
388 extern struct inet_timewait_death_row dccp_death_row;
390 struct dccp_options_received {
391 u32 dccpor_ndp; /* only 24 bits */
392 u32 dccpor_timestamp;
393 u32 dccpor_timestamp_echo;
394 u32 dccpor_elapsed_time;
406 struct dccp_service_list {
408 __be32 dccpsl_list[0];
411 #define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1)
413 static inline int dccp_list_has_service(const struct dccp_service_list *sl,
414 const __be32 service)
416 if (likely(sl != NULL)) {
417 u32 i = sl->dccpsl_nr;
419 if (sl->dccpsl_list[i] == service)
428 * struct dccp_sock - DCCP socket state
430 * @dccps_swl - sequence number window low
431 * @dccps_swh - sequence number window high
432 * @dccps_awl - acknowledgement number window low
433 * @dccps_awh - acknowledgement number window high
434 * @dccps_iss - initial sequence number sent
435 * @dccps_isr - initial sequence number received
436 * @dccps_osr - first OPEN sequence number received
437 * @dccps_gss - greatest sequence number sent
438 * @dccps_gsr - greatest valid sequence number received
439 * @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss
440 * @dccps_timestamp_time - time of latest TIMESTAMP option
441 * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
442 * @dccps_packet_size - Set thru setsockopt
443 * @dccps_role - Role of this sock, one of %dccp_role
444 * @dccps_ndp_count - number of Non Data Packets since last data packet
445 * @dccps_hc_rx_ackvec - rx half connection ack vector
448 /* inet_connection_sock has to be the first member of dccp_sock */
449 struct inet_connection_sock dccps_inet_connection;
460 __be32 dccps_service;
461 struct dccp_service_list *dccps_service_list;
462 struct timeval dccps_timestamp_time;
463 __u32 dccps_timestamp_echo;
464 __u32 dccps_packet_size;
465 __u16 dccps_l_ack_ratio;
466 __u16 dccps_r_ack_ratio;
467 unsigned long dccps_ndp_count;
468 __u32 dccps_mss_cache;
469 struct dccp_options dccps_options;
470 struct dccp_ackvec *dccps_hc_rx_ackvec;
471 struct ccid *dccps_hc_rx_ccid;
472 struct ccid *dccps_hc_tx_ccid;
473 struct dccp_options_received dccps_options_received;
474 struct timeval dccps_epoch;
475 enum dccp_role dccps_role:2;
476 __u8 dccps_hc_rx_insert_options:1;
477 __u8 dccps_hc_tx_insert_options:1;
480 static inline struct dccp_sock *dccp_sk(const struct sock *sk)
482 return (struct dccp_sock *)sk;
485 static inline int dccp_service_not_initialized(const struct sock *sk)
487 return dccp_sk(sk)->dccps_service == DCCP_SERVICE_INVALID_VALUE;
490 static inline const char *dccp_role(const struct sock *sk)
492 switch (dccp_sk(sk)->dccps_role) {
493 case DCCP_ROLE_UNDEFINED: return "undefined";
494 case DCCP_ROLE_LISTEN: return "listen";
495 case DCCP_ROLE_SERVER: return "server";
496 case DCCP_ROLE_CLIENT: return "client";
501 #endif /* __KERNEL__ */
503 #endif /* _LINUX_DCCP_H */