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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/**
59 * struct dccp_hdr_request - Conection initiation request header
60 *
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
63 */
64struct dccp_hdr_request {
Andrea Bittau60fe62e2006-03-20 19:23:32 -080065 __be32 dccph_req_service;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070066};
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070067/**
68 * struct dccp_hdr_ack_bits - acknowledgment bits common to most packets
69 *
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
72 */
73struct dccp_hdr_ack_bits {
Andrea Bittau60fe62e2006-03-20 19:23:32 -080074 __be16 dccph_reserved1;
75 __be16 dccph_ack_nr_high;
76 __be32 dccph_ack_nr_low;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070077};
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070078/**
79 * struct dccp_hdr_response - Conection initiation response header
80 *
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
85 */
86struct dccp_hdr_response {
87 struct dccp_hdr_ack_bits dccph_resp_ack;
Andrea Bittau60fe62e2006-03-20 19:23:32 -080088 __be32 dccph_resp_service;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070089};
90
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070091/**
92 * struct dccp_hdr_reset - Unconditionally shut down a connection
93 *
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
96 */
97struct dccp_hdr_reset {
98 struct dccp_hdr_ack_bits dccph_reset_ack;
99 __u8 dccph_reset_code,
100 dccph_reset_data[3];
101};
102
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700103enum dccp_pkt_type {
104 DCCP_PKT_REQUEST = 0,
105 DCCP_PKT_RESPONSE,
106 DCCP_PKT_DATA,
107 DCCP_PKT_ACK,
108 DCCP_PKT_DATAACK,
109 DCCP_PKT_CLOSEREQ,
110 DCCP_PKT_CLOSE,
111 DCCP_PKT_RESET,
112 DCCP_PKT_SYNC,
113 DCCP_PKT_SYNCACK,
114 DCCP_PKT_INVALID,
115};
116
117#define DCCP_NR_PKT_TYPES DCCP_PKT_INVALID
118
119static inline unsigned int dccp_packet_hdr_len(const __u8 type)
120{
121 if (type == DCCP_PKT_DATA)
122 return 0;
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);
135}
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700136enum 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,
149};
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,
168 DCCPO_MIN_CCID_SPECIFIC = 128,
169 DCCPO_MAX_CCID_SPECIFIC = 255,
170};
171
Ian McDonaldb83eff62006-09-22 14:25:36 +1200172/* DCCP CCIDS */
173enum {
174 DCCPC_CCID2 = 2,
175 DCCPC_CCID3 = 3,
176};
177
Gerrit Renkerc02fdc02006-11-14 12:48:10 -0200178/* DCCP features (RFC 4340 section 6.4) */
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200179enum {
180 DCCPF_RESERVED = 0,
181 DCCPF_CCID = 1,
Gerrit Renkerc02fdc02006-11-14 12:48:10 -0200182 DCCPF_SHORT_SEQNOS = 2, /* XXX: not yet implemented */
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200183 DCCPF_SEQUENCE_WINDOW = 3,
Gerrit Renkerc02fdc02006-11-14 12:48:10 -0200184 DCCPF_ECN_INCAPABLE = 4, /* XXX: not yet implemented */
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200185 DCCPF_ACK_RATIO = 5,
186 DCCPF_SEND_ACK_VECTOR = 6,
187 DCCPF_SEND_NDP_COUNT = 7,
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200188 DCCPF_MIN_CSUM_COVER = 8,
Gerrit Renkerc02fdc02006-11-14 12:48:10 -0200189 DCCPF_DATA_CHECKSUM = 9, /* XXX: not yet implemented */
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200190 /* 10-127 reserved */
191 DCCPF_MIN_CCID_SPECIFIC = 128,
192 DCCPF_MAX_CCID_SPECIFIC = 255,
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700193};
194
Andrea Bittauafe00252006-03-20 17:43:56 -0800195/* this structure is argument to DCCP_SOCKOPT_CHANGE_X */
196struct dccp_so_feat {
197 __u8 dccpsf_feat;
Al Viro1acc04c2006-10-10 22:44:37 +0100198 __u8 __user *dccpsf_val;
Andrea Bittauafe00252006-03-20 17:43:56 -0800199 __u8 dccpsf_len;
200};
201
Arnaldo Carvalho de Meloa84ffe42005-08-28 04:51:32 -0300202/* DCCP socket options */
Gerrit Renker5aed3242006-11-28 19:33:36 -0200203#define DCCP_SOCKOPT_PACKET_SIZE 1 /* XXX deprecated, without effect */
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700204#define DCCP_SOCKOPT_SERVICE 2
Andrea Bittauafe00252006-03-20 17:43:56 -0800205#define DCCP_SOCKOPT_CHANGE_L 3
206#define DCCP_SOCKOPT_CHANGE_R 4
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200207#define DCCP_SOCKOPT_SEND_CSCOV 10
208#define DCCP_SOCKOPT_RECV_CSCOV 11
Arnaldo Carvalho de Melo88f964d2005-09-18 00:19:32 -0700209#define DCCP_SOCKOPT_CCID_RX_INFO 128
210#define DCCP_SOCKOPT_CCID_TX_INFO 192
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700211
Gerrit Renker09dbc382006-11-14 12:57:34 -0200212/* maximum number of services provided on the same listening port */
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700213#define DCCP_SERVICE_LIST_MAX_LEN 32
Arnaldo Carvalho de Meloa84ffe42005-08-28 04:51:32 -0300214
Harald Welte5a47a472005-08-09 20:26:03 -0700215#ifdef __KERNEL__
216
217#include <linux/in.h>
Arnaldo Carvalho de Melo19ac2142007-08-19 17:18:33 -0700218#include <linux/ktime.h>
Harald Welte5a47a472005-08-09 20:26:03 -0700219#include <linux/list.h>
220#include <linux/uio.h>
221#include <linux/workqueue.h>
222
223#include <net/inet_connection_sock.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -0200224#include <net/inet_sock.h>
Arnaldo Carvalho de Melo64cf1e52005-08-09 20:45:21 -0700225#include <net/inet_timewait_sock.h>
Harald Welte5a47a472005-08-09 20:26:03 -0700226#include <net/tcp_states.h>
Harald Welte5a47a472005-08-09 20:26:03 -0700227
228enum dccp_state {
229 DCCP_OPEN = TCP_ESTABLISHED,
230 DCCP_REQUESTING = TCP_SYN_SENT,
231 DCCP_PARTOPEN = TCP_FIN_WAIT1, /* FIXME:
232 This mapping is horrible, but TCP has
233 no matching state for DCCP_PARTOPEN,
234 as TCP_SYN_RECV is already used by
235 DCCP_RESPOND, why don't stop using TCP
236 mapping of states? OK, now we don't use
237 sk_stream_sendmsg anymore, so doesn't
238 seem to exist any reason for us to
239 do the TCP mapping here */
240 DCCP_LISTEN = TCP_LISTEN,
241 DCCP_RESPOND = TCP_SYN_RECV,
242 DCCP_CLOSING = TCP_CLOSING,
243 DCCP_TIME_WAIT = TCP_TIME_WAIT,
244 DCCP_CLOSED = TCP_CLOSE,
245 DCCP_MAX_STATES = TCP_MAX_STATES,
246};
247
248#define DCCP_STATE_MASK 0xf
249#define DCCP_ACTION_FIN (1<<7)
250
251enum {
252 DCCPF_OPEN = TCPF_ESTABLISHED,
253 DCCPF_REQUESTING = TCPF_SYN_SENT,
254 DCCPF_PARTOPEN = TCPF_FIN_WAIT1,
255 DCCPF_LISTEN = TCPF_LISTEN,
256 DCCPF_RESPOND = TCPF_SYN_RECV,
257 DCCPF_CLOSING = TCPF_CLOSING,
258 DCCPF_TIME_WAIT = TCPF_TIME_WAIT,
259 DCCPF_CLOSED = TCPF_CLOSE,
260};
261
262static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb)
263{
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700264 return (struct dccp_hdr *)skb_transport_header(skb);
Harald Welte5a47a472005-08-09 20:26:03 -0700265}
266
Gerrit Renker9b420782006-11-10 11:22:32 -0200267static inline struct dccp_hdr *dccp_zeroed_hdr(struct sk_buff *skb, int headlen)
268{
Arnaldo Carvalho de Melobadff6d2007-03-13 13:06:52 -0300269 skb_push(skb, headlen);
270 skb_reset_transport_header(skb);
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700271 return memset(skb_transport_header(skb), 0, headlen);
Gerrit Renker9b420782006-11-10 11:22:32 -0200272}
273
Harald Welte5a47a472005-08-09 20:26:03 -0700274static inline struct dccp_hdr_ext *dccp_hdrx(const struct sk_buff *skb)
275{
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700276 return (struct dccp_hdr_ext *)(skb_transport_header(skb) +
277 sizeof(struct dccp_hdr));
Harald Welte5a47a472005-08-09 20:26:03 -0700278}
279
Harald Welte1d3de412005-08-09 20:26:55 -0700280static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh)
281{
282 return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);
283}
284
Harald Welte5a47a472005-08-09 20:26:03 -0700285static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)
286{
287 const struct dccp_hdr *dh = dccp_hdr(skb);
Harald Welte1d3de412005-08-09 20:26:55 -0700288 return __dccp_basic_hdr_len(dh);
Harald Welte5a47a472005-08-09 20:26:03 -0700289}
290
291static inline __u64 dccp_hdr_seq(const struct sk_buff *skb)
292{
293 const struct dccp_hdr *dh = dccp_hdr(skb);
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800294 __u64 seq_nr = ntohs(dh->dccph_seq);
Harald Welte5a47a472005-08-09 20:26:03 -0700295
296 if (dh->dccph_x != 0)
297 seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(skb)->dccph_seq_low);
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800298 else
299 seq_nr += (u32)dh->dccph_seq2 << 16;
Harald Welte5a47a472005-08-09 20:26:03 -0700300
301 return seq_nr;
302}
303
304static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb)
305{
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700306 return (struct dccp_hdr_request *)(skb_transport_header(skb) +
307 dccp_basic_hdr_len(skb));
Harald Welte5a47a472005-08-09 20:26:03 -0700308}
309
310static inline struct dccp_hdr_ack_bits *dccp_hdr_ack_bits(const struct sk_buff *skb)
311{
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700312 return (struct dccp_hdr_ack_bits *)(skb_transport_header(skb) +
313 dccp_basic_hdr_len(skb));
Harald Welte5a47a472005-08-09 20:26:03 -0700314}
315
316static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb)
317{
318 const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb);
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800319 return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) + ntohl(dhack->dccph_ack_nr_low);
Harald Welte5a47a472005-08-09 20:26:03 -0700320}
321
322static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb)
323{
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700324 return (struct dccp_hdr_response *)(skb_transport_header(skb) +
325 dccp_basic_hdr_len(skb));
Harald Welte5a47a472005-08-09 20:26:03 -0700326}
327
328static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb)
329{
Arnaldo Carvalho de Melo9c702202007-04-25 18:04:18 -0700330 return (struct dccp_hdr_reset *)(skb_transport_header(skb) +
331 dccp_basic_hdr_len(skb));
Harald Welte5a47a472005-08-09 20:26:03 -0700332}
333
Harald Welte1d3de412005-08-09 20:26:55 -0700334static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh)
335{
336 return __dccp_basic_hdr_len(dh) +
337 dccp_packet_hdr_len(dh->dccph_type);
338}
339
Harald Welte5a47a472005-08-09 20:26:03 -0700340static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
341{
Harald Welte1d3de412005-08-09 20:26:55 -0700342 return __dccp_hdr_len(dccp_hdr(skb));
Harald Welte5a47a472005-08-09 20:26:03 -0700343}
344
345
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700346/* initial values for each feature */
347#define DCCPF_INITIAL_SEQUENCE_WINDOW 100
Andrea Bittauafe00252006-03-20 17:43:56 -0800348#define DCCPF_INITIAL_ACK_RATIO 2
Ian McDonaldb83eff62006-09-22 14:25:36 +1200349#define DCCPF_INITIAL_CCID DCCPC_CCID2
Andrea Bittau2a91aa32006-03-20 17:41:47 -0800350#define DCCPF_INITIAL_SEND_ACK_VECTOR 1
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700351/* FIXME: for now we're default to 1 but it should really be 0 */
352#define DCCPF_INITIAL_SEND_NDP_COUNT 1
353
354#define DCCP_NDP_LIMIT 0xFFFFFF
355
356/**
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800357 * struct dccp_minisock - Minimal DCCP connection representation
358 *
359 * Will be used to pass the state from dccp_request_sock to dccp_sock.
360 *
361 * @dccpms_sequence_window - Sequence Window Feature (section 7.5.2)
362 * @dccpms_ccid - Congestion Control Id (CCID) (section 10)
363 * @dccpms_send_ack_vector - Send Ack Vector Feature (section 11.5)
364 * @dccpms_send_ndp_count - Send NDP Count Feature (7.7.2)
Gerrit Renker09dbc382006-11-14 12:57:34 -0200365 * @dccpms_ack_ratio - Ack Ratio Feature (section 11.3)
366 * @dccpms_pending - List of features being negotiated
367 * @dccpms_conf -
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700368 */
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800369struct dccp_minisock {
370 __u64 dccpms_sequence_window;
371 __u8 dccpms_rx_ccid;
372 __u8 dccpms_tx_ccid;
373 __u8 dccpms_send_ack_vector;
374 __u8 dccpms_send_ndp_count;
375 __u8 dccpms_ack_ratio;
376 struct list_head dccpms_pending;
377 struct list_head dccpms_conf;
Andrea Bittauafe00252006-03-20 17:43:56 -0800378};
379
380struct dccp_opt_conf {
381 __u8 *dccpoc_val;
382 __u8 dccpoc_len;
383};
384
385struct dccp_opt_pend {
386 struct list_head dccpop_node;
387 __u8 dccpop_type;
388 __u8 dccpop_feat;
389 __u8 *dccpop_val;
390 __u8 dccpop_len;
391 int dccpop_conf;
392 struct dccp_opt_conf *dccpop_sc;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700393};
394
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800395extern void __dccp_minisock_init(struct dccp_minisock *dmsk);
396extern void dccp_minisock_init(struct dccp_minisock *dmsk);
397
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700398extern int dccp_parse_options(struct sock *sk, struct sk_buff *skb);
399
400struct dccp_request_sock {
401 struct inet_request_sock dreq_inet_rsk;
402 __u64 dreq_iss;
403 __u64 dreq_isr;
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800404 __be32 dreq_service;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700405};
406
407static inline struct dccp_request_sock *dccp_rsk(const struct request_sock *req)
408{
409 return (struct dccp_request_sock *)req;
410}
411
Arnaldo Carvalho de Melo64cf1e52005-08-09 20:45:21 -0700412extern struct inet_timewait_death_row dccp_death_row;
413
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700414struct dccp_options_received {
Arnaldo Carvalho de Meloae31c332005-09-18 00:17:51 -0700415 u32 dccpor_ndp; /* only 24 bits */
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700416 u32 dccpor_timestamp;
417 u32 dccpor_timestamp_echo;
418 u32 dccpor_elapsed_time;
419};
420
421struct ccid;
422
423enum dccp_role {
424 DCCP_ROLE_UNDEFINED,
425 DCCP_ROLE_LISTEN,
426 DCCP_ROLE_CLIENT,
427 DCCP_ROLE_SERVER,
428};
429
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700430struct dccp_service_list {
431 __u32 dccpsl_nr;
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800432 __be32 dccpsl_list[0];
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700433};
434
435#define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1)
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200436#define DCCP_SERVICE_CODE_IS_ABSENT 0
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700437
438static inline int dccp_list_has_service(const struct dccp_service_list *sl,
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800439 const __be32 service)
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700440{
441 if (likely(sl != NULL)) {
442 u32 i = sl->dccpsl_nr;
443 while (i--)
444 if (sl->dccpsl_list[i] == service)
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200445 return 1;
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700446 }
447 return 0;
448}
449
Arnaldo Carvalho de Meloae31c332005-09-18 00:17:51 -0700450struct dccp_ackvec;
451
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700452/**
453 * struct dccp_sock - DCCP socket state
454 *
455 * @dccps_swl - sequence number window low
456 * @dccps_swh - sequence number window high
457 * @dccps_awl - acknowledgement number window low
458 * @dccps_awh - acknowledgement number window high
459 * @dccps_iss - initial sequence number sent
460 * @dccps_isr - initial sequence number received
461 * @dccps_osr - first OPEN sequence number received
462 * @dccps_gss - greatest sequence number sent
463 * @dccps_gsr - greatest valid sequence number received
464 * @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss
Gerrit Renker09dbc382006-11-14 12:57:34 -0200465 * @dccps_service - first (passive sock) or unique (active sock) service code
466 * @dccps_service_list - second .. last service code on passive socket
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700467 * @dccps_timestamp_time - time of latest TIMESTAMP option
468 * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
Gerrit Renker91d73c12007-04-20 13:57:21 -0700469 * @dccps_l_ack_ratio - feature-local Ack Ratio
470 * @dccps_r_ack_ratio - feature-remote Ack Ratio
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200471 * @dccps_pcslen - sender partial checksum coverage (via sockopt)
472 * @dccps_pcrlen - receiver partial checksum coverage (via sockopt)
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)
475 * @dccps_minisock - associated minisock (accessed via dccp_msk)
Arnaldo Carvalho de Meloae31c332005-09-18 00:17:51 -0700476 * @dccps_hc_rx_ackvec - rx half connection ack vector
Gerrit Renker91d73c12007-04-20 13:57:21 -0700477 * @dccps_hc_rx_ccid - CCID used for the receiver (or receiving half-connection)
478 * @dccps_hc_tx_ccid - CCID used for the sender (or sending half-connection)
479 * @dccps_options_received - parsed set of retrieved options
480 * @dccps_role - role of this sock, one of %dccp_role
481 * @dccps_hc_rx_insert_options - receiver wants to add options when acking
482 * @dccps_hc_tx_insert_options - sender wants to add options when sending
Ian McDonald97e58482006-08-26 19:16:45 -0700483 * @dccps_xmit_timer - timer for when CCID is not ready to send
Gerrit Renker89560b52007-03-20 15:27:17 -0300484 * @dccps_syn_rtt - RTT sample from Request/Response exchange (in usecs)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700485 */
486struct dccp_sock {
487 /* inet_connection_sock has to be the first member of dccp_sock */
488 struct inet_connection_sock dccps_inet_connection;
Gerrit Renker89560b52007-03-20 15:27:17 -0300489#define dccps_syn_rtt dccps_inet_connection.icsk_ack.lrcvtime
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700490 __u64 dccps_swl;
491 __u64 dccps_swh;
492 __u64 dccps_awl;
493 __u64 dccps_awh;
494 __u64 dccps_iss;
495 __u64 dccps_isr;
496 __u64 dccps_osr;
497 __u64 dccps_gss;
498 __u64 dccps_gsr;
499 __u64 dccps_gar;
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800500 __be32 dccps_service;
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700501 struct dccp_service_list *dccps_service_list;
Arnaldo Carvalho de Melo19ac2142007-08-19 17:18:33 -0700502 ktime_t dccps_timestamp_time;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700503 __u32 dccps_timestamp_echo;
Andrea Bittau2a91aa32006-03-20 17:41:47 -0800504 __u16 dccps_l_ack_ratio;
505 __u16 dccps_r_ack_ratio;
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200506 __u16 dccps_pcslen;
507 __u16 dccps_pcrlen;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700508 unsigned long dccps_ndp_count;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700509 __u32 dccps_mss_cache;
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800510 struct dccp_minisock dccps_minisock;
Arnaldo Carvalho de Meloae31c332005-09-18 00:17:51 -0700511 struct dccp_ackvec *dccps_hc_rx_ackvec;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700512 struct ccid *dccps_hc_rx_ccid;
513 struct ccid *dccps_hc_tx_ccid;
514 struct dccp_options_received dccps_options_received;
515 enum dccp_role dccps_role:2;
Arnaldo Carvalho de Melo507d37c2005-09-09 02:30:07 -0300516 __u8 dccps_hc_rx_insert_options:1;
517 __u8 dccps_hc_tx_insert_options:1;
Ian McDonald97e58482006-08-26 19:16:45 -0700518 struct timer_list dccps_xmit_timer;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700519};
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200520
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700521static inline struct dccp_sock *dccp_sk(const struct sock *sk)
522{
523 return (struct dccp_sock *)sk;
524}
525
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800526static inline struct dccp_minisock *dccp_msk(const struct sock *sk)
527{
528 return (struct dccp_minisock *)&dccp_sk(sk)->dccps_minisock;
529}
530
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700531static inline const char *dccp_role(const struct sock *sk)
532{
533 switch (dccp_sk(sk)->dccps_role) {
534 case DCCP_ROLE_UNDEFINED: return "undefined";
535 case DCCP_ROLE_LISTEN: return "listen";
536 case DCCP_ROLE_SERVER: return "server";
537 case DCCP_ROLE_CLIENT: return "client";
538 }
539 return NULL;
540}
541
Harald Welte5a47a472005-08-09 20:26:03 -0700542#endif /* __KERNEL__ */
543
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700544#endif /* _LINUX_DCCP_H */