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Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001#ifndef _LINUX_DCCP_H
2#define _LINUX_DCCP_H
3
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07004#include <linux/types.h>
Harald Welte5a47a472005-08-09 20:26:03 -07005#include <asm/byteorder.h>
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07006
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07007/**
8 * struct dccp_hdr - generic part of DCCP packet header
9 *
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
19 */
20struct dccp_hdr {
Andrea Bittau60fe62e2006-03-20 19:23:32 -080021 __be16 dccph_sport,
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070022 dccph_dport;
23 __u8 dccph_doff;
24#if defined(__LITTLE_ENDIAN_BITFIELD)
25 __u8 dccph_cscov:4,
26 dccph_ccval:4;
27#elif defined(__BIG_ENDIAN_BITFIELD)
28 __u8 dccph_ccval:4,
29 dccph_cscov:4;
30#else
31#error "Adjust your <asm/byteorder.h> defines"
32#endif
Al Viro9981a0e2006-11-14 21:24:30 -080033 __sum16 dccph_checksum;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070034#if defined(__LITTLE_ENDIAN_BITFIELD)
Andrea Bittau60fe62e2006-03-20 19:23:32 -080035 __u8 dccph_x:1,
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070036 dccph_type:4,
Andrea Bittau60fe62e2006-03-20 19:23:32 -080037 dccph_reserved:3;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070038#elif defined(__BIG_ENDIAN_BITFIELD)
Andrea Bittau60fe62e2006-03-20 19:23:32 -080039 __u8 dccph_reserved:3,
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070040 dccph_type:4,
Andrea Bittau60fe62e2006-03-20 19:23:32 -080041 dccph_x:1;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070042#else
43#error "Adjust your <asm/byteorder.h> defines"
44#endif
Andrea Bittau60fe62e2006-03-20 19:23:32 -080045 __u8 dccph_seq2;
46 __be16 dccph_seq;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070047};
48
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070049/**
50 * struct dccp_hdr_ext - the low bits of a 48 bit seq packet
51 *
52 * @dccph_seq_low - low 24 bits of a 48 bit seq packet
53 */
54struct dccp_hdr_ext {
Andrea Bittau60fe62e2006-03-20 19:23:32 -080055 __be32 dccph_seq_low;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070056};
57
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070058/**
Gerrit Renker0430ee32007-09-26 11:27:56 -030059 * struct dccp_hdr_request - Connection initiation request header
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070060 *
61 * @dccph_req_service - Service to which the client app wants to connect
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070062 */
63struct dccp_hdr_request {
Andrea Bittau60fe62e2006-03-20 19:23:32 -080064 __be32 dccph_req_service;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070065};
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070066/**
67 * struct dccp_hdr_ack_bits - acknowledgment bits common to most packets
68 *
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
71 */
72struct dccp_hdr_ack_bits {
Andrea Bittau60fe62e2006-03-20 19:23:32 -080073 __be16 dccph_reserved1;
74 __be16 dccph_ack_nr_high;
75 __be32 dccph_ack_nr_low;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070076};
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070077/**
Gerrit Renker0430ee32007-09-26 11:27:56 -030078 * struct dccp_hdr_response - Connection initiation response header
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070079 *
Gerrit Renker0430ee32007-09-26 11:27:56 -030080 * @dccph_resp_ack - 48 bit Acknowledgment Number Subheader (5.3)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070081 * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070082 */
83struct dccp_hdr_response {
84 struct dccp_hdr_ack_bits dccph_resp_ack;
Andrea Bittau60fe62e2006-03-20 19:23:32 -080085 __be32 dccph_resp_service;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070086};
87
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070088/**
89 * struct dccp_hdr_reset - Unconditionally shut down a connection
90 *
Gerrit Renker0430ee32007-09-26 11:27:56 -030091 * @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
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070094 */
95struct dccp_hdr_reset {
96 struct dccp_hdr_ack_bits dccph_reset_ack;
97 __u8 dccph_reset_code,
98 dccph_reset_data[3];
99};
100
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700101enum dccp_pkt_type {
102 DCCP_PKT_REQUEST = 0,
103 DCCP_PKT_RESPONSE,
104 DCCP_PKT_DATA,
105 DCCP_PKT_ACK,
106 DCCP_PKT_DATAACK,
107 DCCP_PKT_CLOSEREQ,
108 DCCP_PKT_CLOSE,
109 DCCP_PKT_RESET,
110 DCCP_PKT_SYNC,
111 DCCP_PKT_SYNCACK,
112 DCCP_PKT_INVALID,
113};
114
115#define DCCP_NR_PKT_TYPES DCCP_PKT_INVALID
116
117static inline unsigned int dccp_packet_hdr_len(const __u8 type)
118{
119 if (type == DCCP_PKT_DATA)
120 return 0;
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);
133}
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700134enum 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,
Gerrit Renkerd8ef2c22007-10-24 10:27:48 -0200147
148 DCCP_MAX_RESET_CODES /* Leave at the end! */
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700149};
150
151/* DCCP options */
152enum {
153 DCCPO_PADDING = 0,
154 DCCPO_MANDATORY = 1,
155 DCCPO_MIN_RESERVED = 3,
156 DCCPO_MAX_RESERVED = 31,
Andrea Bittauafe00252006-03-20 17:43:56 -0800157 DCCPO_CHANGE_L = 32,
158 DCCPO_CONFIRM_L = 33,
159 DCCPO_CHANGE_R = 34,
160 DCCPO_CONFIRM_R = 35,
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700161 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,
167 DCCPO_MAX = 45,
Gerrit Renkera18213d2010-09-19 20:08:00 +0200168 DCCPO_MIN_RX_CCID_SPECIFIC = 128, /* from sender to receiver */
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,
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700172};
Gerrit Renkerb20a9c22008-11-23 16:02:31 -0800173/* maximum size of a single TLV-encoded DCCP option (sans type/len bytes) */
174#define DCCP_SINGLE_OPT_MAXLEN 253
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700175
Ian McDonaldb83eff62006-09-22 14:25:36 +1200176/* DCCP CCIDS */
177enum {
178 DCCPC_CCID2 = 2,
179 DCCPC_CCID3 = 3,
180};
181
Gerrit Renkerc02fdc02006-11-14 12:48:10 -0200182/* DCCP features (RFC 4340 section 6.4) */
Gerrit Renker7d43d1a02008-11-04 23:43:47 -0800183enum dccp_feature_numbers {
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200184 DCCPF_RESERVED = 0,
185 DCCPF_CCID = 1,
Gerrit Renker7d43d1a02008-11-04 23:43:47 -0800186 DCCPF_SHORT_SEQNOS = 2,
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200187 DCCPF_SEQUENCE_WINDOW = 3,
Gerrit Renker7d43d1a02008-11-04 23:43:47 -0800188 DCCPF_ECN_INCAPABLE = 4,
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200189 DCCPF_ACK_RATIO = 5,
190 DCCPF_SEND_ACK_VECTOR = 6,
191 DCCPF_SEND_NDP_COUNT = 7,
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200192 DCCPF_MIN_CSUM_COVER = 8,
Gerrit Renker7d43d1a02008-11-04 23:43:47 -0800193 DCCPF_DATA_CHECKSUM = 9,
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200194 /* 10-127 reserved */
195 DCCPF_MIN_CCID_SPECIFIC = 128,
Gerrit Renker7d43d1a02008-11-04 23:43:47 -0800196 DCCPF_SEND_LEV_RATE = 192, /* RFC 4342, sec. 8.4 */
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200197 DCCPF_MAX_CCID_SPECIFIC = 255,
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700198};
199
Tomasz Grobelny871a2c12010-12-04 13:38:01 +0100200/* DCCP socket control message types for cmsg */
201enum dccp_cmsg_type {
202 DCCP_SCM_PRIORITY = 1,
203 DCCP_SCM_QPOLICY_MAX = 0xFFFF,
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
213};
214
Arnaldo Carvalho de Meloa84ffe42005-08-28 04:51:32 -0300215/* DCCP socket options */
Gerrit Renker5aed3242006-11-28 19:33:36 -0200216#define DCCP_SOCKOPT_PACKET_SIZE 1 /* XXX deprecated, without effect */
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700217#define DCCP_SOCKOPT_SERVICE 2
Andrea Bittauafe00252006-03-20 17:43:56 -0800218#define DCCP_SOCKOPT_CHANGE_L 3
219#define DCCP_SOCKOPT_CHANGE_R 4
Gerrit Renker7c559a92007-10-04 14:39:22 -0700220#define DCCP_SOCKOPT_GET_CUR_MPS 5
Gerrit Renkerb8599d22007-12-13 12:25:01 -0200221#define DCCP_SOCKOPT_SERVER_TIMEWAIT 6
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200222#define DCCP_SOCKOPT_SEND_CSCOV 10
223#define DCCP_SOCKOPT_RECV_CSCOV 11
Gerrit Renkerd90ebcb2008-11-12 00:47:26 -0800224#define DCCP_SOCKOPT_AVAILABLE_CCIDS 12
Gerrit Renkerb20a9c22008-11-23 16:02:31 -0800225#define DCCP_SOCKOPT_CCID 13
226#define DCCP_SOCKOPT_TX_CCID 14
227#define DCCP_SOCKOPT_RX_CCID 15
Tomasz Grobelny871a2c12010-12-04 13:38:01 +0100228#define DCCP_SOCKOPT_QPOLICY_ID 16
229#define DCCP_SOCKOPT_QPOLICY_TXQLEN 17
Arnaldo Carvalho de Melo88f964d2005-09-18 00:19:32 -0700230#define DCCP_SOCKOPT_CCID_RX_INFO 128
231#define DCCP_SOCKOPT_CCID_TX_INFO 192
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700232
Gerrit Renker09dbc382006-11-14 12:57:34 -0200233/* maximum number of services provided on the same listening port */
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700234#define DCCP_SERVICE_LIST_MAX_LEN 32
Arnaldo Carvalho de Meloa84ffe42005-08-28 04:51:32 -0300235
Harald Welte5a47a472005-08-09 20:26:03 -0700236#ifdef __KERNEL__
237
238#include <linux/in.h>
Alexey Dobriyana6b7a402011-06-06 10:43:46 +0000239#include <linux/interrupt.h>
Arnaldo Carvalho de Melo19ac2142007-08-19 17:18:33 -0700240#include <linux/ktime.h>
Harald Welte5a47a472005-08-09 20:26:03 -0700241#include <linux/list.h>
242#include <linux/uio.h>
243#include <linux/workqueue.h>
244
245#include <net/inet_connection_sock.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200246#include <net/inet_sock.h>
Arnaldo Carvalho de Melo64cf1e52005-08-09 20:45:21 -0700247#include <net/inet_timewait_sock.h>
Harald Welte5a47a472005-08-09 20:26:03 -0700248#include <net/tcp_states.h>
Harald Welte5a47a472005-08-09 20:26:03 -0700249
250enum dccp_state {
Gerrit Renkerf11135a2007-11-28 11:34:53 -0200251 DCCP_OPEN = TCP_ESTABLISHED,
252 DCCP_REQUESTING = TCP_SYN_SENT,
253 DCCP_LISTEN = TCP_LISTEN,
254 DCCP_RESPOND = TCP_SYN_RECV,
255 /*
256 * States involved in closing a DCCP connection:
257 * 1) ACTIVE_CLOSEREQ is entered by a server sending a CloseReq.
258 *
259 * 2) CLOSING can have three different meanings (RFC 4340, 8.3):
260 * a. Client has performed active-close, has sent a Close to the server
261 * from state OPEN or PARTOPEN, and is waiting for the final Reset
262 * (in this case, SOCK_DONE == 1).
263 * b. Client is asked to perform passive-close, by receiving a CloseReq
264 * in (PART)OPEN state. It sends a Close and waits for final Reset
265 * (in this case, SOCK_DONE == 0).
266 * c. Server performs an active-close as in (a), keeps TIMEWAIT state.
267 *
268 * 3) The following intermediate states are employed to give passively
269 * closing nodes a chance to process their unread data:
270 * - PASSIVE_CLOSE (from OPEN => CLOSED) and
271 * - PASSIVE_CLOSEREQ (from (PART)OPEN to CLOSING; case (b) above).
272 */
273 DCCP_ACTIVE_CLOSEREQ = TCP_FIN_WAIT1,
274 DCCP_PASSIVE_CLOSE = TCP_CLOSE_WAIT, /* any node receiving a Close */
275 DCCP_CLOSING = TCP_CLOSING,
276 DCCP_TIME_WAIT = TCP_TIME_WAIT,
277 DCCP_CLOSED = TCP_CLOSE,
278 DCCP_PARTOPEN = TCP_MAX_STATES,
279 DCCP_PASSIVE_CLOSEREQ, /* clients receiving CloseReq */
Gerrit Renker9b91ad22007-11-20 21:56:37 -0200280 DCCP_MAX_STATES
Harald Welte5a47a472005-08-09 20:26:03 -0700281};
282
Harald Welte5a47a472005-08-09 20:26:03 -0700283enum {
Gerrit Renkerf11135a2007-11-28 11:34:53 -0200284 DCCPF_OPEN = TCPF_ESTABLISHED,
285 DCCPF_REQUESTING = TCPF_SYN_SENT,
286 DCCPF_LISTEN = TCPF_LISTEN,
287 DCCPF_RESPOND = TCPF_SYN_RECV,
288 DCCPF_ACTIVE_CLOSEREQ = TCPF_FIN_WAIT1,
289 DCCPF_CLOSING = TCPF_CLOSING,
290 DCCPF_TIME_WAIT = TCPF_TIME_WAIT,
291 DCCPF_CLOSED = TCPF_CLOSE,
292 DCCPF_PARTOPEN = (1 << DCCP_PARTOPEN),
Harald Welte5a47a472005-08-09 20:26:03 -0700293};
294
295static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb)
296{
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700297 return (struct dccp_hdr *)skb_transport_header(skb);
Harald Welte5a47a472005-08-09 20:26:03 -0700298}
299
Gerrit Renker9b420782006-11-10 11:22:32 -0200300static inline struct dccp_hdr *dccp_zeroed_hdr(struct sk_buff *skb, int headlen)
301{
Arnaldo Carvalho de Melobadff6d2007-03-13 13:06:52 -0300302 skb_push(skb, headlen);
303 skb_reset_transport_header(skb);
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700304 return memset(skb_transport_header(skb), 0, headlen);
Gerrit Renker9b420782006-11-10 11:22:32 -0200305}
306
Gerrit Renkerfde20102007-10-24 10:12:09 -0200307static inline struct dccp_hdr_ext *dccp_hdrx(const struct dccp_hdr *dh)
Harald Welte5a47a472005-08-09 20:26:03 -0700308{
Gerrit Renkerfde20102007-10-24 10:12:09 -0200309 return (struct dccp_hdr_ext *)((unsigned char *)dh + sizeof(*dh));
Harald Welte5a47a472005-08-09 20:26:03 -0700310}
311
Harald Welte1d3de412005-08-09 20:26:55 -0700312static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh)
313{
314 return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);
315}
316
Harald Welte5a47a472005-08-09 20:26:03 -0700317static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)
318{
319 const struct dccp_hdr *dh = dccp_hdr(skb);
Harald Welte1d3de412005-08-09 20:26:55 -0700320 return __dccp_basic_hdr_len(dh);
Harald Welte5a47a472005-08-09 20:26:03 -0700321}
322
Gerrit Renkerfde20102007-10-24 10:12:09 -0200323static inline __u64 dccp_hdr_seq(const struct dccp_hdr *dh)
Harald Welte5a47a472005-08-09 20:26:03 -0700324{
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800325 __u64 seq_nr = ntohs(dh->dccph_seq);
Harald Welte5a47a472005-08-09 20:26:03 -0700326
327 if (dh->dccph_x != 0)
Gerrit Renkerfde20102007-10-24 10:12:09 -0200328 seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(dh)->dccph_seq_low);
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800329 else
330 seq_nr += (u32)dh->dccph_seq2 << 16;
Harald Welte5a47a472005-08-09 20:26:03 -0700331
332 return seq_nr;
333}
334
335static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb)
336{
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700337 return (struct dccp_hdr_request *)(skb_transport_header(skb) +
338 dccp_basic_hdr_len(skb));
Harald Welte5a47a472005-08-09 20:26:03 -0700339}
340
341static inline struct dccp_hdr_ack_bits *dccp_hdr_ack_bits(const struct sk_buff *skb)
342{
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700343 return (struct dccp_hdr_ack_bits *)(skb_transport_header(skb) +
344 dccp_basic_hdr_len(skb));
Harald Welte5a47a472005-08-09 20:26:03 -0700345}
346
347static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb)
348{
349 const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb);
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800350 return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) + ntohl(dhack->dccph_ack_nr_low);
Harald Welte5a47a472005-08-09 20:26:03 -0700351}
352
353static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb)
354{
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700355 return (struct dccp_hdr_response *)(skb_transport_header(skb) +
356 dccp_basic_hdr_len(skb));
Harald Welte5a47a472005-08-09 20:26:03 -0700357}
358
359static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb)
360{
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700361 return (struct dccp_hdr_reset *)(skb_transport_header(skb) +
362 dccp_basic_hdr_len(skb));
Harald Welte5a47a472005-08-09 20:26:03 -0700363}
364
Harald Welte1d3de412005-08-09 20:26:55 -0700365static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh)
366{
367 return __dccp_basic_hdr_len(dh) +
368 dccp_packet_hdr_len(dh->dccph_type);
369}
370
Harald Welte5a47a472005-08-09 20:26:03 -0700371static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
372{
Harald Welte1d3de412005-08-09 20:26:55 -0700373 return __dccp_hdr_len(dccp_hdr(skb));
Harald Welte5a47a472005-08-09 20:26:03 -0700374}
375
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700376/**
Gerrit Renkerb4d4f7c2007-12-13 12:37:19 -0200377 * struct dccp_request_sock - represent DCCP-specific connection request
378 * @dreq_inet_rsk: structure inherited from
Samuel Jerof541fb72012-02-26 18:22:02 -0700379 * @dreq_iss: initial sequence number, sent on the first Response (RFC 4340, 7.1)
380 * @dreq_gss: greatest sequence number sent (for retransmitted Responses)
381 * @dreq_isr: initial sequence number received in the first Request
382 * @dreq_gsr: greatest sequence number received (for retransmitted Request(s))
Gerrit Renkerb4d4f7c2007-12-13 12:37:19 -0200383 * @dreq_service: service code present on the Request (there is just one)
Gerrit Renkerac757732008-11-04 23:55:49 -0800384 * @dreq_featneg: feature negotiation options for this connection
Gerrit Renkerb4d4f7c2007-12-13 12:37:19 -0200385 * The following two fields are analogous to the ones in dccp_sock:
386 * @dreq_timestamp_echo: last received timestamp to echo (13.1)
387 * @dreq_timestamp_echo: the time of receiving the last @dreq_timestamp_echo
388 */
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700389struct dccp_request_sock {
390 struct inet_request_sock dreq_inet_rsk;
391 __u64 dreq_iss;
Samuel Jerof541fb72012-02-26 18:22:02 -0700392 __u64 dreq_gss;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700393 __u64 dreq_isr;
Samuel Jerof541fb72012-02-26 18:22:02 -0700394 __u64 dreq_gsr;
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800395 __be32 dreq_service;
Gerrit Renkerac757732008-11-04 23:55:49 -0800396 struct list_head dreq_featneg;
Gerrit Renkerb4d4f7c2007-12-13 12:37:19 -0200397 __u32 dreq_timestamp_echo;
398 __u32 dreq_timestamp_time;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700399};
400
401static inline struct dccp_request_sock *dccp_rsk(const struct request_sock *req)
402{
403 return (struct dccp_request_sock *)req;
404}
405
Arnaldo Carvalho de Melo64cf1e52005-08-09 20:45:21 -0700406extern struct inet_timewait_death_row dccp_death_row;
407
Gerrit Renker8b819412007-12-13 12:29:24 -0200408extern int dccp_parse_options(struct sock *sk, struct dccp_request_sock *dreq,
409 struct sk_buff *skb);
410
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700411struct dccp_options_received {
Gerrit Renker5b5d0e72008-07-13 11:51:40 +0100412 u64 dccpor_ndp:48;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700413 u32 dccpor_timestamp;
414 u32 dccpor_timestamp_echo;
415 u32 dccpor_elapsed_time;
416};
417
418struct ccid;
419
420enum dccp_role {
421 DCCP_ROLE_UNDEFINED,
422 DCCP_ROLE_LISTEN,
423 DCCP_ROLE_CLIENT,
424 DCCP_ROLE_SERVER,
425};
426
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700427struct dccp_service_list {
428 __u32 dccpsl_nr;
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800429 __be32 dccpsl_list[0];
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700430};
431
432#define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1)
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200433#define DCCP_SERVICE_CODE_IS_ABSENT 0
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700434
435static inline int dccp_list_has_service(const struct dccp_service_list *sl,
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800436 const __be32 service)
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700437{
438 if (likely(sl != NULL)) {
439 u32 i = sl->dccpsl_nr;
440 while (i--)
441 if (sl->dccpsl_list[i] == service)
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200442 return 1;
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700443 }
444 return 0;
445}
446
Arnaldo Carvalho de Meloae31c332005-09-18 00:17:51 -0700447struct dccp_ackvec;
448
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700449/**
450 * struct dccp_sock - DCCP socket state
451 *
452 * @dccps_swl - sequence number window low
453 * @dccps_swh - sequence number window high
454 * @dccps_awl - acknowledgement number window low
455 * @dccps_awh - acknowledgement number window high
456 * @dccps_iss - initial sequence number sent
457 * @dccps_isr - initial sequence number received
458 * @dccps_osr - first OPEN sequence number received
459 * @dccps_gss - greatest sequence number sent
460 * @dccps_gsr - greatest valid sequence number received
461 * @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss
Gerrit Renker09dbc382006-11-14 12:57:34 -0200462 * @dccps_service - first (passive sock) or unique (active sock) service code
463 * @dccps_service_list - second .. last service code on passive socket
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700464 * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
Gerrit Renkerb4d4f7c2007-12-13 12:37:19 -0200465 * @dccps_timestamp_time - time of receiving latest @dccps_timestamp_echo
Gerrit Renker91d73c12007-04-20 13:57:21 -0700466 * @dccps_l_ack_ratio - feature-local Ack Ratio
467 * @dccps_r_ack_ratio - feature-remote Ack Ratio
Gerrit Renker792b4872009-01-16 23:36:31 +0000468 * @dccps_l_seq_win - local Sequence Window (influences ack number validity)
469 * @dccps_r_seq_win - remote Sequence Window (influences seq number validity)
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200470 * @dccps_pcslen - sender partial checksum coverage (via sockopt)
471 * @dccps_pcrlen - receiver partial checksum coverage (via sockopt)
Gerrit Renker4098dce2008-12-08 01:18:37 -0800472 * @dccps_send_ndp_count - local Send NDP Count feature (7.7.2)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700473 * @dccps_ndp_count - number of Non Data Packets since last data packet
Gerrit Renker91d73c12007-04-20 13:57:21 -0700474 * @dccps_mss_cache - current value of MSS (path MTU minus header sizes)
Gerrit Renkera94f0f92007-09-26 11:31:49 -0300475 * @dccps_rate_last - timestamp for rate-limiting DCCP-Sync (RFC 4340, 7.5.4)
Gerrit Renkerac757732008-11-04 23:55:49 -0800476 * @dccps_featneg - tracks feature-negotiation state (mostly during handshake)
Arnaldo Carvalho de Meloae31c332005-09-18 00:17:51 -0700477 * @dccps_hc_rx_ackvec - rx half connection ack vector
Gerrit Renker91d73c12007-04-20 13:57:21 -0700478 * @dccps_hc_rx_ccid - CCID used for the receiver (or receiving half-connection)
479 * @dccps_hc_tx_ccid - CCID used for the sender (or sending half-connection)
480 * @dccps_options_received - parsed set of retrieved options
Tomasz Grobelny871a2c12010-12-04 13:38:01 +0100481 * @dccps_qpolicy - TX dequeueing policy, one of %dccp_packet_dequeueing_policy
482 * @dccps_tx_qlen - maximum length of the TX queue
Gerrit Renker91d73c12007-04-20 13:57:21 -0700483 * @dccps_role - role of this sock, one of %dccp_role
484 * @dccps_hc_rx_insert_options - receiver wants to add options when acking
485 * @dccps_hc_tx_insert_options - sender wants to add options when sending
Gerrit Renkerb8599d22007-12-13 12:25:01 -0200486 * @dccps_server_timewait - server holds timewait state on close (RFC 4340, 8.3)
Gerrit Renkerd83447f2010-11-14 17:25:46 +0100487 * @dccps_sync_scheduled - flag which signals "send out-of-band message soon"
Gerrit Renkerdc841e32010-10-27 19:16:26 +0000488 * @dccps_xmitlet - tasklet scheduled by the TX CCID to dequeue data packets
489 * @dccps_xmit_timer - used by the TX CCID to delay sending (rate-based pacing)
Gerrit Renker89560b52007-03-20 15:27:17 -0300490 * @dccps_syn_rtt - RTT sample from Request/Response exchange (in usecs)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700491 */
492struct dccp_sock {
493 /* inet_connection_sock has to be the first member of dccp_sock */
494 struct inet_connection_sock dccps_inet_connection;
Gerrit Renker89560b52007-03-20 15:27:17 -0300495#define dccps_syn_rtt dccps_inet_connection.icsk_ack.lrcvtime
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700496 __u64 dccps_swl;
497 __u64 dccps_swh;
498 __u64 dccps_awl;
499 __u64 dccps_awh;
500 __u64 dccps_iss;
501 __u64 dccps_isr;
502 __u64 dccps_osr;
503 __u64 dccps_gss;
504 __u64 dccps_gsr;
505 __u64 dccps_gar;
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800506 __be32 dccps_service;
Arnaldo Carvalho de Melocf6b5fbe2008-02-03 04:07:48 -0800507 __u32 dccps_mss_cache;
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700508 struct dccp_service_list *dccps_service_list;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700509 __u32 dccps_timestamp_echo;
Gerrit Renkerb4d4f7c2007-12-13 12:37:19 -0200510 __u32 dccps_timestamp_time;
Andrea Bittau2a91aa32006-03-20 17:41:47 -0800511 __u16 dccps_l_ack_ratio;
512 __u16 dccps_r_ack_ratio;
Gerrit Renker792b4872009-01-16 23:36:31 +0000513 __u64 dccps_l_seq_win:48;
514 __u64 dccps_r_seq_win:48;
Gerrit Renker29450552008-11-16 22:53:48 -0800515 __u8 dccps_pcslen:4;
516 __u8 dccps_pcrlen:4;
Gerrit Renker4098dce2008-12-08 01:18:37 -0800517 __u8 dccps_send_ndp_count:1;
Gerrit Renker5b5d0e72008-07-13 11:51:40 +0100518 __u64 dccps_ndp_count:48;
Gerrit Renkera94f0f92007-09-26 11:31:49 -0300519 unsigned long dccps_rate_last;
Gerrit Renkerac757732008-11-04 23:55:49 -0800520 struct list_head dccps_featneg;
Arnaldo Carvalho de Meloae31c332005-09-18 00:17:51 -0700521 struct dccp_ackvec *dccps_hc_rx_ackvec;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700522 struct ccid *dccps_hc_rx_ccid;
523 struct ccid *dccps_hc_tx_ccid;
524 struct dccp_options_received dccps_options_received;
Tomasz Grobelny871a2c12010-12-04 13:38:01 +0100525 __u8 dccps_qpolicy;
526 __u32 dccps_tx_qlen;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700527 enum dccp_role dccps_role:2;
Arnaldo Carvalho de Melo507d37c2005-09-09 02:30:07 -0300528 __u8 dccps_hc_rx_insert_options:1;
529 __u8 dccps_hc_tx_insert_options:1;
Gerrit Renkerb8599d22007-12-13 12:25:01 -0200530 __u8 dccps_server_timewait:1;
Gerrit Renkerd83447f2010-11-14 17:25:46 +0100531 __u8 dccps_sync_scheduled:1;
Gerrit Renkerdc841e32010-10-27 19:16:26 +0000532 struct tasklet_struct dccps_xmitlet;
Ian McDonald97e58482006-08-26 19:16:45 -0700533 struct timer_list dccps_xmit_timer;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700534};
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200535
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700536static inline struct dccp_sock *dccp_sk(const struct sock *sk)
537{
538 return (struct dccp_sock *)sk;
539}
540
541static inline const char *dccp_role(const struct sock *sk)
542{
543 switch (dccp_sk(sk)->dccps_role) {
544 case DCCP_ROLE_UNDEFINED: return "undefined";
545 case DCCP_ROLE_LISTEN: return "listen";
546 case DCCP_ROLE_SERVER: return "server";
547 case DCCP_ROLE_CLIENT: return "client";
548 }
549 return NULL;
550}
551
Eric Dumazetc72e1182012-04-12 22:16:05 +0000552extern void dccp_syn_ack_timeout(struct sock *sk, struct request_sock *req);
553
Harald Welte5a47a472005-08-09 20:26:03 -0700554#endif /* __KERNEL__ */
555
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700556#endif /* _LINUX_DCCP_H */