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[PATCH] USB Serial: move old changelog comments out of source code
[linux/fpc-iii.git] / net / dccp / dccp.h
blob5871c027f9dce28c73ea100050c525f0d2c34102
1 #ifndef _DCCP_H
2 #define _DCCP_H
3 /*
4 * net/dccp/dccp.h
5 *
6 * An implementation of the DCCP protocol
7 * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
8 * Copyright (c) 2005 Ian McDonald <iam4@cs.waikato.ac.nz>
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14
15 #include <linux/config.h>
16 #include <linux/dccp.h>
17 #include <net/snmp.h>
18 #include <net/sock.h>
19 #include <net/tcp.h>
20 #include "ackvec.h"
21
22 #ifdef CONFIG_IP_DCCP_DEBUG
23 extern int dccp_debug;
24
25 #define dccp_pr_debug(format, a...) \
26 do { if (dccp_debug) \
27 printk(KERN_DEBUG "%s: " format, __FUNCTION__ , ##a); \
28 } while (0)
29 #define dccp_pr_debug_cat(format, a...) do { if (dccp_debug) \
30 printk(format, ##a); } while (0)
31 #else
32 #define dccp_pr_debug(format, a...)
33 #define dccp_pr_debug_cat(format, a...)
34 #endif
35
36 extern struct inet_hashinfo dccp_hashinfo;
37
38 extern atomic_t dccp_orphan_count;
39 extern int dccp_tw_count;
40 extern void dccp_tw_deschedule(struct inet_timewait_sock *tw);
41
42 extern void dccp_time_wait(struct sock *sk, int state, int timeo);
43
44 /* FIXME: Right size this */
45 #define DCCP_MAX_OPT_LEN 128
46
47 #define DCCP_MAX_PACKET_HDR 32
48
49 #define MAX_DCCP_HEADER (DCCP_MAX_PACKET_HDR + DCCP_MAX_OPT_LEN + MAX_HEADER)
50
51 #define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT
52 * state, about 60 seconds */
53
54 /* draft-ietf-dccp-spec-11.txt initial RTO value */
55 #define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ))
56
57 /* Maximal interval between probes for local resources. */
58 #define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U))
59
60 #define DCCP_RTO_MAX ((unsigned)(120 * HZ)) /* FIXME: using TCP value */
61
62 extern struct proto dccp_v4_prot;
63
64 /* is seq1 < seq2 ? */
65 static inline int before48(const u64 seq1, const u64 seq2)
66 {
67 return (s64)((seq1 << 16) - (seq2 << 16)) < 0;
68 }
69
70 /* is seq1 > seq2 ? */
71 static inline int after48(const u64 seq1, const u64 seq2)
72 {
73 return (s64)((seq2 << 16) - (seq1 << 16)) < 0;
74 }
75
76 /* is seq2 <= seq1 <= seq3 ? */
77 static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3)
78 {
79 return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16);
80 }
81
82 static inline u64 max48(const u64 seq1, const u64 seq2)
83 {
84 return after48(seq1, seq2) ? seq1 : seq2;
85 }
86
87 enum {
88 DCCP_MIB_NUM = 0,
89 DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */
90 DCCP_MIB_ESTABRESETS, /* EstabResets */
91 DCCP_MIB_CURRESTAB, /* CurrEstab */
92 DCCP_MIB_OUTSEGS, /* OutSegs */
93 DCCP_MIB_OUTRSTS,
94 DCCP_MIB_ABORTONTIMEOUT,
95 DCCP_MIB_TIMEOUTS,
96 DCCP_MIB_ABORTFAILED,
97 DCCP_MIB_PASSIVEOPENS,
98 DCCP_MIB_ATTEMPTFAILS,
99 DCCP_MIB_OUTDATAGRAMS,
100 DCCP_MIB_INERRS,
101 DCCP_MIB_OPTMANDATORYERROR,
102 DCCP_MIB_INVALIDOPT,
103 __DCCP_MIB_MAX
104 };
105
106 #define DCCP_MIB_MAX __DCCP_MIB_MAX
107 struct dccp_mib {
108 unsigned long mibs[DCCP_MIB_MAX];
109 } __SNMP_MIB_ALIGN__;
110
111 DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics);
112 #define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field)
113 #define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field)
114 #define DCCP_INC_STATS_USER(field) SNMP_INC_STATS_USER(dccp_statistics, field)
115 #define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field)
116 #define DCCP_ADD_STATS_BH(field, val) \
117 SNMP_ADD_STATS_BH(dccp_statistics, field, val)
118 #define DCCP_ADD_STATS_USER(field, val) \
119 SNMP_ADD_STATS_USER(dccp_statistics, field, val)
120
121 extern int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb);
122 extern int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb);
123
124 extern int dccp_send_response(struct sock *sk);
125 extern void dccp_send_ack(struct sock *sk);
126 extern void dccp_send_delayed_ack(struct sock *sk);
127 extern void dccp_send_sync(struct sock *sk, const u64 seq,
128 const enum dccp_pkt_type pkt_type);
129
130 extern int dccp_write_xmit(struct sock *sk, struct sk_buff *skb, long *timeo);
131 extern void dccp_write_space(struct sock *sk);
132
133 extern void dccp_init_xmit_timers(struct sock *sk);
134 static inline void dccp_clear_xmit_timers(struct sock *sk)
135 {
136 inet_csk_clear_xmit_timers(sk);
137 }
138
139 extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu);
140
141 extern const char *dccp_packet_name(const int type);
142 extern const char *dccp_state_name(const int state);
143
144 static inline void dccp_set_state(struct sock *sk, const int state)
145 {
146 const int oldstate = sk->sk_state;
147
148 dccp_pr_debug("%s(%p) %-10.10s -> %s\n",
149 dccp_role(sk), sk,
150 dccp_state_name(oldstate), dccp_state_name(state));
151 WARN_ON(state == oldstate);
152
153 switch (state) {
154 case DCCP_OPEN:
155 if (oldstate != DCCP_OPEN)
156 DCCP_INC_STATS(DCCP_MIB_CURRESTAB);
157 break;
158
159 case DCCP_CLOSED:
160 if (oldstate == DCCP_CLOSING || oldstate == DCCP_OPEN)
161 DCCP_INC_STATS(DCCP_MIB_ESTABRESETS);
162
163 sk->sk_prot->unhash(sk);
164 if (inet_csk(sk)->icsk_bind_hash != NULL &&
165 !(sk->sk_userlocks & SOCK_BINDPORT_LOCK))
166 inet_put_port(&dccp_hashinfo, sk);
167 /* fall through */
168 default:
169 if (oldstate == DCCP_OPEN)
170 DCCP_DEC_STATS(DCCP_MIB_CURRESTAB);
171 }
172
173 /* Change state AFTER socket is unhashed to avoid closed
174 * socket sitting in hash tables.
175 */
176 sk->sk_state = state;
177 }
178
179 static inline void dccp_done(struct sock *sk)
180 {
181 dccp_set_state(sk, DCCP_CLOSED);
182 dccp_clear_xmit_timers(sk);
183
184 sk->sk_shutdown = SHUTDOWN_MASK;
185
186 if (!sock_flag(sk, SOCK_DEAD))
187 sk->sk_state_change(sk);
188 else
189 inet_csk_destroy_sock(sk);
190 }
191
192 static inline void dccp_openreq_init(struct request_sock *req,
193 struct dccp_sock *dp,
194 struct sk_buff *skb)
195 {
196 /*
197 * FIXME: fill in the other req fields from the DCCP options
198 * received
199 */
200 inet_rsk(req)->rmt_port = dccp_hdr(skb)->dccph_sport;
201 inet_rsk(req)->acked = 0;
202 req->rcv_wnd = 0;
203 }
204
205 extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb);
206
207 extern struct sock *dccp_create_openreq_child(struct sock *sk,
208 const struct request_sock *req,
209 const struct sk_buff *skb);
210
211 extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb);
212
213 extern void dccp_v4_err(struct sk_buff *skb, u32);
214
215 extern int dccp_v4_rcv(struct sk_buff *skb);
216
217 extern struct sock *dccp_v4_request_recv_sock(struct sock *sk,
218 struct sk_buff *skb,
219 struct request_sock *req,
220 struct dst_entry *dst);
221 extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb,
222 struct request_sock *req,
223 struct request_sock **prev);
224
225 extern int dccp_child_process(struct sock *parent, struct sock *child,
226 struct sk_buff *skb);
227 extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
228 struct dccp_hdr *dh, unsigned len);
229 extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
230 const struct dccp_hdr *dh, const unsigned len);
231
232 extern void dccp_close(struct sock *sk, long timeout);
233 extern struct sk_buff *dccp_make_response(struct sock *sk,
234 struct dst_entry *dst,
235 struct request_sock *req);
236 extern struct sk_buff *dccp_make_reset(struct sock *sk,
237 struct dst_entry *dst,
238 enum dccp_reset_codes code);
239
240 extern int dccp_connect(struct sock *sk);
241 extern int dccp_disconnect(struct sock *sk, int flags);
242 extern int dccp_getsockopt(struct sock *sk, int level, int optname,
243 char __user *optval, int __user *optlen);
244 extern int dccp_setsockopt(struct sock *sk, int level, int optname,
245 char __user *optval, int optlen);
246 extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg);
247 extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk,
248 struct msghdr *msg, size_t size);
249 extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk,
250 struct msghdr *msg, size_t len, int nonblock,
251 int flags, int *addr_len);
252 extern void dccp_shutdown(struct sock *sk, int how);
253
254 extern int dccp_v4_checksum(const struct sk_buff *skb,
255 const u32 saddr, const u32 daddr);
256
257 extern int dccp_v4_send_reset(struct sock *sk,
258 enum dccp_reset_codes code);
259 extern void dccp_send_close(struct sock *sk, const int active);
260
261 struct dccp_skb_cb {
262 __u8 dccpd_type:4;
263 __u8 dccpd_ccval:4;
264 __u8 dccpd_reset_code;
265 __u16 dccpd_opt_len;
266 __u64 dccpd_seq;
267 __u64 dccpd_ack_seq;
268 };
269
270 #define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0]))
271
272 static inline int dccp_non_data_packet(const struct sk_buff *skb)
273 {
274 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
275
276 return type == DCCP_PKT_ACK ||
277 type == DCCP_PKT_CLOSE ||
278 type == DCCP_PKT_CLOSEREQ ||
279 type == DCCP_PKT_RESET ||
280 type == DCCP_PKT_SYNC ||
281 type == DCCP_PKT_SYNCACK;
282 }
283
284 static inline int dccp_packet_without_ack(const struct sk_buff *skb)
285 {
286 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
287
288 return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST;
289 }
290
291 #define DCCP_MAX_SEQNO ((((u64)1) << 48) - 1)
292 #define DCCP_PKT_WITHOUT_ACK_SEQ (DCCP_MAX_SEQNO << 2)
293
294 static inline void dccp_set_seqno(u64 *seqno, u64 value)
295 {
296 if (value > DCCP_MAX_SEQNO)
297 value -= DCCP_MAX_SEQNO + 1;
298 *seqno = value;
299 }
300
301 static inline u64 dccp_delta_seqno(u64 seqno1, u64 seqno2)
302 {
303 return ((seqno2 << 16) - (seqno1 << 16)) >> 16;
304 }
305
306 static inline void dccp_inc_seqno(u64 *seqno)
307 {
308 if (++*seqno > DCCP_MAX_SEQNO)
309 *seqno = 0;
310 }
311
312 static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss)
313 {
314 struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh +
315 sizeof(*dh));
316
317 #if defined(__LITTLE_ENDIAN_BITFIELD)
318 dh->dccph_seq = htonl((gss >> 32)) >> 8;
319 #elif defined(__BIG_ENDIAN_BITFIELD)
320 dh->dccph_seq = htonl((gss >> 32));
321 #else
322 #error "Adjust your <asm/byteorder.h> defines"
323 #endif
324 dhx->dccph_seq_low = htonl(gss & 0xffffffff);
325 }
326
327 static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack,
328 const u64 gsr)
329 {
330 #if defined(__LITTLE_ENDIAN_BITFIELD)
331 dhack->dccph_ack_nr_high = htonl((gsr >> 32)) >> 8;
332 #elif defined(__BIG_ENDIAN_BITFIELD)
333 dhack->dccph_ack_nr_high = htonl((gsr >> 32));
334 #else
335 #error "Adjust your <asm/byteorder.h> defines"
336 #endif
337 dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff);
338 }
339
340 static inline void dccp_update_gsr(struct sock *sk, u64 seq)
341 {
342 struct dccp_sock *dp = dccp_sk(sk);
343
344 dp->dccps_gsr = seq;
345 dccp_set_seqno(&dp->dccps_swl,
346 (dp->dccps_gsr + 1 -
347 (dp->dccps_options.dccpo_sequence_window / 4)));
348 dccp_set_seqno(&dp->dccps_swh,
349 (dp->dccps_gsr +
350 (3 * dp->dccps_options.dccpo_sequence_window) / 4));
351 }
352
353 static inline void dccp_update_gss(struct sock *sk, u64 seq)
354 {
355 struct dccp_sock *dp = dccp_sk(sk);
356
357 dp->dccps_awh = dp->dccps_gss = seq;
358 dccp_set_seqno(&dp->dccps_awl,
359 (dp->dccps_gss -
360 dp->dccps_options.dccpo_sequence_window + 1));
361 }
362
363 static inline int dccp_ack_pending(const struct sock *sk)
364 {
365 const struct dccp_sock *dp = dccp_sk(sk);
366 return dp->dccps_timestamp_echo != 0 ||
367 #ifdef CONFIG_IP_DCCP_ACKVEC
368 (dp->dccps_options.dccpo_send_ack_vector &&
369 dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) ||
370 #endif
371 inet_csk_ack_scheduled(sk);
372 }
373
374 extern void dccp_insert_options(struct sock *sk, struct sk_buff *skb);
375 extern void dccp_insert_option_elapsed_time(struct sock *sk,
376 struct sk_buff *skb,
377 u32 elapsed_time);
378 extern void dccp_insert_option_timestamp(struct sock *sk,
379 struct sk_buff *skb);
380 extern void dccp_insert_option(struct sock *sk, struct sk_buff *skb,
381 unsigned char option,
382 const void *value, unsigned char len);
383
384 extern struct socket *dccp_ctl_socket;
385
386 extern void dccp_timestamp(const struct sock *sk, struct timeval *tv);
387
388 static inline suseconds_t timeval_usecs(const struct timeval *tv)
389 {
390 return tv->tv_sec * USEC_PER_SEC + tv->tv_usec;
391 }
392
393 static inline suseconds_t timeval_delta(const struct timeval *large,
394 const struct timeval *small)
395 {
396 time_t secs = large->tv_sec - small->tv_sec;
397 suseconds_t usecs = large->tv_usec - small->tv_usec;
398
399 if (usecs < 0) {
400 secs--;
401 usecs += USEC_PER_SEC;
402 }
403 return secs * USEC_PER_SEC + usecs;
404 }
405
406 static inline void timeval_add_usecs(struct timeval *tv,
407 const suseconds_t usecs)
408 {
409 tv->tv_usec += usecs;
410 while (tv->tv_usec >= USEC_PER_SEC) {
411 tv->tv_sec++;
412 tv->tv_usec -= USEC_PER_SEC;
413 }
414 }
415
416 static inline void timeval_sub_usecs(struct timeval *tv,
417 const suseconds_t usecs)
418 {
419 tv->tv_usec -= usecs;
420 while (tv->tv_usec < 0) {
421 tv->tv_sec--;
422 tv->tv_usec += USEC_PER_SEC;
423 }
424 }
425
426 #endif /* _DCCP_H */
Linux with added FPC-III support