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-rw-r--r--include/linux/dccp.h122
1 files changed, 51 insertions, 71 deletions
diff --git a/include/linux/dccp.h b/include/linux/dccp.h
index 6080449fbec9..010e2d87ed75 100644
--- a/include/linux/dccp.h
+++ b/include/linux/dccp.h
@@ -165,9 +165,13 @@ enum {
165 DCCPO_TIMESTAMP_ECHO = 42, 165 DCCPO_TIMESTAMP_ECHO = 42,
166 DCCPO_ELAPSED_TIME = 43, 166 DCCPO_ELAPSED_TIME = 43,
167 DCCPO_MAX = 45, 167 DCCPO_MAX = 45,
168 DCCPO_MIN_CCID_SPECIFIC = 128, 168 DCCPO_MIN_RX_CCID_SPECIFIC = 128, /* from sender to receiver */
169 DCCPO_MAX_CCID_SPECIFIC = 255, 169 DCCPO_MAX_RX_CCID_SPECIFIC = 191,
170 DCCPO_MIN_TX_CCID_SPECIFIC = 192, /* from receiver to sender */
171 DCCPO_MAX_TX_CCID_SPECIFIC = 255,
170}; 172};
173/* maximum size of a single TLV-encoded DCCP option (sans type/len bytes) */
174#define DCCP_SINGLE_OPT_MAXLEN 253
171 175
172/* DCCP CCIDS */ 176/* DCCP CCIDS */
173enum { 177enum {
@@ -176,27 +180,36 @@ enum {
176}; 180};
177 181
178/* DCCP features (RFC 4340 section 6.4) */ 182/* DCCP features (RFC 4340 section 6.4) */
179enum { 183enum dccp_feature_numbers {
180 DCCPF_RESERVED = 0, 184 DCCPF_RESERVED = 0,
181 DCCPF_CCID = 1, 185 DCCPF_CCID = 1,
182 DCCPF_SHORT_SEQNOS = 2, /* XXX: not yet implemented */ 186 DCCPF_SHORT_SEQNOS = 2,
183 DCCPF_SEQUENCE_WINDOW = 3, 187 DCCPF_SEQUENCE_WINDOW = 3,
184 DCCPF_ECN_INCAPABLE = 4, /* XXX: not yet implemented */ 188 DCCPF_ECN_INCAPABLE = 4,
185 DCCPF_ACK_RATIO = 5, 189 DCCPF_ACK_RATIO = 5,
186 DCCPF_SEND_ACK_VECTOR = 6, 190 DCCPF_SEND_ACK_VECTOR = 6,
187 DCCPF_SEND_NDP_COUNT = 7, 191 DCCPF_SEND_NDP_COUNT = 7,
188 DCCPF_MIN_CSUM_COVER = 8, 192 DCCPF_MIN_CSUM_COVER = 8,
189 DCCPF_DATA_CHECKSUM = 9, /* XXX: not yet implemented */ 193 DCCPF_DATA_CHECKSUM = 9,
190 /* 10-127 reserved */ 194 /* 10-127 reserved */
191 DCCPF_MIN_CCID_SPECIFIC = 128, 195 DCCPF_MIN_CCID_SPECIFIC = 128,
196 DCCPF_SEND_LEV_RATE = 192, /* RFC 4342, sec. 8.4 */
192 DCCPF_MAX_CCID_SPECIFIC = 255, 197 DCCPF_MAX_CCID_SPECIFIC = 255,
193}; 198};
194 199
195/* this structure is argument to DCCP_SOCKOPT_CHANGE_X */ 200/* DCCP socket control message types for cmsg */
196struct dccp_so_feat { 201enum dccp_cmsg_type {
197 __u8 dccpsf_feat; 202 DCCP_SCM_PRIORITY = 1,
198 __u8 __user *dccpsf_val; 203 DCCP_SCM_QPOLICY_MAX = 0xFFFF,
199 __u8 dccpsf_len; 204 /* ^-- Up to here reserved exclusively for qpolicy parameters */
205 DCCP_SCM_MAX
206};
207
208/* DCCP priorities for outgoing/queued packets */
209enum dccp_packet_dequeueing_policy {
210 DCCPQ_POLICY_SIMPLE,
211 DCCPQ_POLICY_PRIO,
212 DCCPQ_POLICY_MAX
200}; 213};
201 214
202/* DCCP socket options */ 215/* DCCP socket options */
@@ -208,6 +221,12 @@ struct dccp_so_feat {
208#define DCCP_SOCKOPT_SERVER_TIMEWAIT 6 221#define DCCP_SOCKOPT_SERVER_TIMEWAIT 6
209#define DCCP_SOCKOPT_SEND_CSCOV 10 222#define DCCP_SOCKOPT_SEND_CSCOV 10
210#define DCCP_SOCKOPT_RECV_CSCOV 11 223#define DCCP_SOCKOPT_RECV_CSCOV 11
224#define DCCP_SOCKOPT_AVAILABLE_CCIDS 12
225#define DCCP_SOCKOPT_CCID 13
226#define DCCP_SOCKOPT_TX_CCID 14
227#define DCCP_SOCKOPT_RX_CCID 15
228#define DCCP_SOCKOPT_QPOLICY_ID 16
229#define DCCP_SOCKOPT_QPOLICY_TXQLEN 17
211#define DCCP_SOCKOPT_CCID_RX_INFO 128 230#define DCCP_SOCKOPT_CCID_RX_INFO 128
212#define DCCP_SOCKOPT_CCID_TX_INFO 192 231#define DCCP_SOCKOPT_CCID_TX_INFO 192
213 232
@@ -355,62 +374,13 @@ static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
355 return __dccp_hdr_len(dccp_hdr(skb)); 374 return __dccp_hdr_len(dccp_hdr(skb));
356} 375}
357 376
358
359/* initial values for each feature */
360#define DCCPF_INITIAL_SEQUENCE_WINDOW 100
361#define DCCPF_INITIAL_ACK_RATIO 2
362#define DCCPF_INITIAL_CCID DCCPC_CCID2
363#define DCCPF_INITIAL_SEND_ACK_VECTOR 1
364/* FIXME: for now we're default to 1 but it should really be 0 */
365#define DCCPF_INITIAL_SEND_NDP_COUNT 1
366
367/**
368 * struct dccp_minisock - Minimal DCCP connection representation
369 *
370 * Will be used to pass the state from dccp_request_sock to dccp_sock.
371 *
372 * @dccpms_sequence_window - Sequence Window Feature (section 7.5.2)
373 * @dccpms_ccid - Congestion Control Id (CCID) (section 10)
374 * @dccpms_send_ack_vector - Send Ack Vector Feature (section 11.5)
375 * @dccpms_send_ndp_count - Send NDP Count Feature (7.7.2)
376 * @dccpms_ack_ratio - Ack Ratio Feature (section 11.3)
377 * @dccpms_pending - List of features being negotiated
378 * @dccpms_conf -
379 */
380struct dccp_minisock {
381 __u64 dccpms_sequence_window;
382 __u8 dccpms_rx_ccid;
383 __u8 dccpms_tx_ccid;
384 __u8 dccpms_send_ack_vector;
385 __u8 dccpms_send_ndp_count;
386 __u8 dccpms_ack_ratio;
387 struct list_head dccpms_pending;
388 struct list_head dccpms_conf;
389};
390
391struct dccp_opt_conf {
392 __u8 *dccpoc_val;
393 __u8 dccpoc_len;
394};
395
396struct dccp_opt_pend {
397 struct list_head dccpop_node;
398 __u8 dccpop_type;
399 __u8 dccpop_feat;
400 __u8 *dccpop_val;
401 __u8 dccpop_len;
402 int dccpop_conf;
403 struct dccp_opt_conf *dccpop_sc;
404};
405
406extern void dccp_minisock_init(struct dccp_minisock *dmsk);
407
408/** 377/**
409 * struct dccp_request_sock - represent DCCP-specific connection request 378 * struct dccp_request_sock - represent DCCP-specific connection request
410 * @dreq_inet_rsk: structure inherited from 379 * @dreq_inet_rsk: structure inherited from
411 * @dreq_iss: initial sequence number sent on the Response (RFC 4340, 7.1) 380 * @dreq_iss: initial sequence number sent on the Response (RFC 4340, 7.1)
412 * @dreq_isr: initial sequence number received on the Request 381 * @dreq_isr: initial sequence number received on the Request
413 * @dreq_service: service code present on the Request (there is just one) 382 * @dreq_service: service code present on the Request (there is just one)
383 * @dreq_featneg: feature negotiation options for this connection
414 * The following two fields are analogous to the ones in dccp_sock: 384 * The following two fields are analogous to the ones in dccp_sock:
415 * @dreq_timestamp_echo: last received timestamp to echo (13.1) 385 * @dreq_timestamp_echo: last received timestamp to echo (13.1)
416 * @dreq_timestamp_echo: the time of receiving the last @dreq_timestamp_echo 386 * @dreq_timestamp_echo: the time of receiving the last @dreq_timestamp_echo
@@ -420,6 +390,7 @@ struct dccp_request_sock {
420 __u64 dreq_iss; 390 __u64 dreq_iss;
421 __u64 dreq_isr; 391 __u64 dreq_isr;
422 __be32 dreq_service; 392 __be32 dreq_service;
393 struct list_head dreq_featneg;
423 __u32 dreq_timestamp_echo; 394 __u32 dreq_timestamp_echo;
424 __u32 dreq_timestamp_time; 395 __u32 dreq_timestamp_time;
425}; 396};
@@ -491,21 +462,28 @@ struct dccp_ackvec;
491 * @dccps_timestamp_time - time of receiving latest @dccps_timestamp_echo 462 * @dccps_timestamp_time - time of receiving latest @dccps_timestamp_echo
492 * @dccps_l_ack_ratio - feature-local Ack Ratio 463 * @dccps_l_ack_ratio - feature-local Ack Ratio
493 * @dccps_r_ack_ratio - feature-remote Ack Ratio 464 * @dccps_r_ack_ratio - feature-remote Ack Ratio
465 * @dccps_l_seq_win - local Sequence Window (influences ack number validity)
466 * @dccps_r_seq_win - remote Sequence Window (influences seq number validity)
494 * @dccps_pcslen - sender partial checksum coverage (via sockopt) 467 * @dccps_pcslen - sender partial checksum coverage (via sockopt)
495 * @dccps_pcrlen - receiver partial checksum coverage (via sockopt) 468 * @dccps_pcrlen - receiver partial checksum coverage (via sockopt)
469 * @dccps_send_ndp_count - local Send NDP Count feature (7.7.2)
496 * @dccps_ndp_count - number of Non Data Packets since last data packet 470 * @dccps_ndp_count - number of Non Data Packets since last data packet
497 * @dccps_mss_cache - current value of MSS (path MTU minus header sizes) 471 * @dccps_mss_cache - current value of MSS (path MTU minus header sizes)
498 * @dccps_rate_last - timestamp for rate-limiting DCCP-Sync (RFC 4340, 7.5.4) 472 * @dccps_rate_last - timestamp for rate-limiting DCCP-Sync (RFC 4340, 7.5.4)
499 * @dccps_minisock - associated minisock (accessed via dccp_msk) 473 * @dccps_featneg - tracks feature-negotiation state (mostly during handshake)
500 * @dccps_hc_rx_ackvec - rx half connection ack vector 474 * @dccps_hc_rx_ackvec - rx half connection ack vector
501 * @dccps_hc_rx_ccid - CCID used for the receiver (or receiving half-connection) 475 * @dccps_hc_rx_ccid - CCID used for the receiver (or receiving half-connection)
502 * @dccps_hc_tx_ccid - CCID used for the sender (or sending half-connection) 476 * @dccps_hc_tx_ccid - CCID used for the sender (or sending half-connection)
503 * @dccps_options_received - parsed set of retrieved options 477 * @dccps_options_received - parsed set of retrieved options
478 * @dccps_qpolicy - TX dequeueing policy, one of %dccp_packet_dequeueing_policy
479 * @dccps_tx_qlen - maximum length of the TX queue
504 * @dccps_role - role of this sock, one of %dccp_role 480 * @dccps_role - role of this sock, one of %dccp_role
505 * @dccps_hc_rx_insert_options - receiver wants to add options when acking 481 * @dccps_hc_rx_insert_options - receiver wants to add options when acking
506 * @dccps_hc_tx_insert_options - sender wants to add options when sending 482 * @dccps_hc_tx_insert_options - sender wants to add options when sending
507 * @dccps_server_timewait - server holds timewait state on close (RFC 4340, 8.3) 483 * @dccps_server_timewait - server holds timewait state on close (RFC 4340, 8.3)
508 * @dccps_xmit_timer - timer for when CCID is not ready to send 484 * @dccps_sync_scheduled - flag which signals "send out-of-band message soon"
485 * @dccps_xmitlet - tasklet scheduled by the TX CCID to dequeue data packets
486 * @dccps_xmit_timer - used by the TX CCID to delay sending (rate-based pacing)
509 * @dccps_syn_rtt - RTT sample from Request/Response exchange (in usecs) 487 * @dccps_syn_rtt - RTT sample from Request/Response exchange (in usecs)
510 */ 488 */
511struct dccp_sock { 489struct dccp_sock {
@@ -529,19 +507,26 @@ struct dccp_sock {
529 __u32 dccps_timestamp_time; 507 __u32 dccps_timestamp_time;
530 __u16 dccps_l_ack_ratio; 508 __u16 dccps_l_ack_ratio;
531 __u16 dccps_r_ack_ratio; 509 __u16 dccps_r_ack_ratio;
532 __u16 dccps_pcslen; 510 __u64 dccps_l_seq_win:48;
533 __u16 dccps_pcrlen; 511 __u64 dccps_r_seq_win:48;
512 __u8 dccps_pcslen:4;
513 __u8 dccps_pcrlen:4;
514 __u8 dccps_send_ndp_count:1;
534 __u64 dccps_ndp_count:48; 515 __u64 dccps_ndp_count:48;
535 unsigned long dccps_rate_last; 516 unsigned long dccps_rate_last;
536 struct dccp_minisock dccps_minisock; 517 struct list_head dccps_featneg;
537 struct dccp_ackvec *dccps_hc_rx_ackvec; 518 struct dccp_ackvec *dccps_hc_rx_ackvec;
538 struct ccid *dccps_hc_rx_ccid; 519 struct ccid *dccps_hc_rx_ccid;
539 struct ccid *dccps_hc_tx_ccid; 520 struct ccid *dccps_hc_tx_ccid;
540 struct dccp_options_received dccps_options_received; 521 struct dccp_options_received dccps_options_received;
522 __u8 dccps_qpolicy;
523 __u32 dccps_tx_qlen;
541 enum dccp_role dccps_role:2; 524 enum dccp_role dccps_role:2;
542 __u8 dccps_hc_rx_insert_options:1; 525 __u8 dccps_hc_rx_insert_options:1;
543 __u8 dccps_hc_tx_insert_options:1; 526 __u8 dccps_hc_tx_insert_options:1;
544 __u8 dccps_server_timewait:1; 527 __u8 dccps_server_timewait:1;
528 __u8 dccps_sync_scheduled:1;
529 struct tasklet_struct dccps_xmitlet;
545 struct timer_list dccps_xmit_timer; 530 struct timer_list dccps_xmit_timer;
546}; 531};
547 532
@@ -550,11 +535,6 @@ static inline struct dccp_sock *dccp_sk(const struct sock *sk)
550 return (struct dccp_sock *)sk; 535 return (struct dccp_sock *)sk;
551} 536}
552 537
553static inline struct dccp_minisock *dccp_msk(const struct sock *sk)
554{
555 return (struct dccp_minisock *)&dccp_sk(sk)->dccps_minisock;
556}
557
558static inline const char *dccp_role(const struct sock *sk) 538static inline const char *dccp_role(const struct sock *sk)
559{ 539{
560 switch (dccp_sk(sk)->dccps_role) { 540 switch (dccp_sk(sk)->dccps_role) {