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[DCCP]: Introduce dccp_ipv4_af_ops
[linux-2.6.git] / net / dccp / dccp.h
blobf97b85d55ad80ebab0e8388783eafb7a5ad3bcc8
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_retransmit_skb(struct sock *sk, struct sk_buff *skb);
122
123 extern int dccp_send_response(struct sock *sk);
124 extern void dccp_send_ack(struct sock *sk);
125 extern void dccp_send_delayed_ack(struct sock *sk);
126 extern void dccp_send_sync(struct sock *sk, const u64 seq,
127 const enum dccp_pkt_type pkt_type);
128
129 extern int dccp_write_xmit(struct sock *sk, struct sk_buff *skb, long *timeo);
130 extern void dccp_write_space(struct sock *sk);
131
132 extern void dccp_init_xmit_timers(struct sock *sk);
133 static inline void dccp_clear_xmit_timers(struct sock *sk)
134 {
135 inet_csk_clear_xmit_timers(sk);
136 }
137
138 extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu);
139
140 extern const char *dccp_packet_name(const int type);
141 extern const char *dccp_state_name(const int state);
142
143 static inline void dccp_set_state(struct sock *sk, const int state)
144 {
145 const int oldstate = sk->sk_state;
146
147 dccp_pr_debug("%s(%p) %-10.10s -> %s\n",
148 dccp_role(sk), sk,
149 dccp_state_name(oldstate), dccp_state_name(state));
150 WARN_ON(state == oldstate);
151
152 switch (state) {
153 case DCCP_OPEN:
154 if (oldstate != DCCP_OPEN)
155 DCCP_INC_STATS(DCCP_MIB_CURRESTAB);
156 break;
157
158 case DCCP_CLOSED:
159 if (oldstate == DCCP_CLOSING || oldstate == DCCP_OPEN)
160 DCCP_INC_STATS(DCCP_MIB_ESTABRESETS);
161
162 sk->sk_prot->unhash(sk);
163 if (inet_csk(sk)->icsk_bind_hash != NULL &&
164 !(sk->sk_userlocks & SOCK_BINDPORT_LOCK))
165 inet_put_port(&dccp_hashinfo, sk);
166 /* fall through */
167 default:
168 if (oldstate == DCCP_OPEN)
169 DCCP_DEC_STATS(DCCP_MIB_CURRESTAB);
170 }
171
172 /* Change state AFTER socket is unhashed to avoid closed
173 * socket sitting in hash tables.
174 */
175 sk->sk_state = state;
176 }
177
178 static inline void dccp_done(struct sock *sk)
179 {
180 dccp_set_state(sk, DCCP_CLOSED);
181 dccp_clear_xmit_timers(sk);
182
183 sk->sk_shutdown = SHUTDOWN_MASK;
184
185 if (!sock_flag(sk, SOCK_DEAD))
186 sk->sk_state_change(sk);
187 else
188 inet_csk_destroy_sock(sk);
189 }
190
191 static inline void dccp_openreq_init(struct request_sock *req,
192 struct dccp_sock *dp,
193 struct sk_buff *skb)
194 {
195 /*
196 * FIXME: fill in the other req fields from the DCCP options
197 * received
198 */
199 inet_rsk(req)->rmt_port = dccp_hdr(skb)->dccph_sport;
200 inet_rsk(req)->acked = 0;
201 req->rcv_wnd = 0;
202 }
203
204 extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb);
205
206 extern struct sock *dccp_create_openreq_child(struct sock *sk,
207 const struct request_sock *req,
208 const struct sk_buff *skb);
209
210 extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb);
211
212 extern void dccp_v4_err(struct sk_buff *skb, u32);
213
214 extern int dccp_v4_rcv(struct sk_buff *skb);
215
216 extern struct sock *dccp_v4_request_recv_sock(struct sock *sk,
217 struct sk_buff *skb,
218 struct request_sock *req,
219 struct dst_entry *dst);
220 extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb,
221 struct request_sock *req,
222 struct request_sock **prev);
223
224 extern int dccp_child_process(struct sock *parent, struct sock *child,
225 struct sk_buff *skb);
226 extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
227 struct dccp_hdr *dh, unsigned len);
228 extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
229 const struct dccp_hdr *dh, const unsigned len);
230
231 extern void dccp_close(struct sock *sk, long timeout);
232 extern struct sk_buff *dccp_make_response(struct sock *sk,
233 struct dst_entry *dst,
234 struct request_sock *req);
235 extern struct sk_buff *dccp_make_reset(struct sock *sk,
236 struct dst_entry *dst,
237 enum dccp_reset_codes code);
238
239 extern int dccp_connect(struct sock *sk);
240 extern int dccp_disconnect(struct sock *sk, int flags);
241 extern int dccp_getsockopt(struct sock *sk, int level, int optname,
242 char __user *optval, int __user *optlen);
243 extern int dccp_setsockopt(struct sock *sk, int level, int optname,
244 char __user *optval, int optlen);
245 extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg);
246 extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk,
247 struct msghdr *msg, size_t size);
248 extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk,
249 struct msghdr *msg, size_t len, int nonblock,
250 int flags, int *addr_len);
251 extern void dccp_shutdown(struct sock *sk, int how);
252
253 extern int dccp_v4_checksum(const struct sk_buff *skb,
254 const u32 saddr, const u32 daddr);
255
256 extern int dccp_v4_send_reset(struct sock *sk,
257 enum dccp_reset_codes code);
258 extern void dccp_send_close(struct sock *sk, const int active);
259
260 struct dccp_skb_cb {
261 __u8 dccpd_type:4;
262 __u8 dccpd_ccval:4;
263 __u8 dccpd_reset_code;
264 __u16 dccpd_opt_len;
265 __u64 dccpd_seq;
266 __u64 dccpd_ack_seq;
267 };
268
269 #define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0]))
270
271 static inline int dccp_non_data_packet(const struct sk_buff *skb)
272 {
273 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
274
275 return type == DCCP_PKT_ACK ||
276 type == DCCP_PKT_CLOSE ||
277 type == DCCP_PKT_CLOSEREQ ||
278 type == DCCP_PKT_RESET ||
279 type == DCCP_PKT_SYNC ||
280 type == DCCP_PKT_SYNCACK;
281 }
282
283 static inline int dccp_packet_without_ack(const struct sk_buff *skb)
284 {
285 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
286
287 return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST;
288 }
289
290 #define DCCP_MAX_SEQNO ((((u64)1) << 48) - 1)
291 #define DCCP_PKT_WITHOUT_ACK_SEQ (DCCP_MAX_SEQNO << 2)
292
293 static inline void dccp_set_seqno(u64 *seqno, u64 value)
294 {
295 if (value > DCCP_MAX_SEQNO)
296 value -= DCCP_MAX_SEQNO + 1;
297 *seqno = value;
298 }
299
300 static inline u64 dccp_delta_seqno(u64 seqno1, u64 seqno2)
301 {
302 return ((seqno2 << 16) - (seqno1 << 16)) >> 16;
303 }
304
305 static inline void dccp_inc_seqno(u64 *seqno)
306 {
307 if (++*seqno > DCCP_MAX_SEQNO)
308 *seqno = 0;
309 }
310
311 static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss)
312 {
313 struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh +
314 sizeof(*dh));
315
316 #if defined(__LITTLE_ENDIAN_BITFIELD)
317 dh->dccph_seq = htonl((gss >> 32)) >> 8;
318 #elif defined(__BIG_ENDIAN_BITFIELD)
319 dh->dccph_seq = htonl((gss >> 32));
320 #else
321 #error "Adjust your <asm/byteorder.h> defines"
322 #endif
323 dhx->dccph_seq_low = htonl(gss & 0xffffffff);
324 }
325
326 static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack,
327 const u64 gsr)
328 {
329 #if defined(__LITTLE_ENDIAN_BITFIELD)
330 dhack->dccph_ack_nr_high = htonl((gsr >> 32)) >> 8;
331 #elif defined(__BIG_ENDIAN_BITFIELD)
332 dhack->dccph_ack_nr_high = htonl((gsr >> 32));
333 #else
334 #error "Adjust your <asm/byteorder.h> defines"
335 #endif
336 dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff);
337 }
338
339 static inline void dccp_update_gsr(struct sock *sk, u64 seq)
340 {
341 struct dccp_sock *dp = dccp_sk(sk);
342
343 dp->dccps_gsr = seq;
344 dccp_set_seqno(&dp->dccps_swl,
345 (dp->dccps_gsr + 1 -
346 (dp->dccps_options.dccpo_sequence_window / 4)));
347 dccp_set_seqno(&dp->dccps_swh,
348 (dp->dccps_gsr +
349 (3 * dp->dccps_options.dccpo_sequence_window) / 4));
350 }
351
352 static inline void dccp_update_gss(struct sock *sk, u64 seq)
353 {
354 struct dccp_sock *dp = dccp_sk(sk);
355
356 dp->dccps_awh = dp->dccps_gss = seq;
357 dccp_set_seqno(&dp->dccps_awl,
358 (dp->dccps_gss -
359 dp->dccps_options.dccpo_sequence_window + 1));
360 }
361
362 static inline int dccp_ack_pending(const struct sock *sk)
363 {
364 const struct dccp_sock *dp = dccp_sk(sk);
365 return dp->dccps_timestamp_echo != 0 ||
366 #ifdef CONFIG_IP_DCCP_ACKVEC
367 (dp->dccps_options.dccpo_send_ack_vector &&
368 dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) ||
369 #endif
370 inet_csk_ack_scheduled(sk);
371 }
372
373 extern void dccp_insert_options(struct sock *sk, struct sk_buff *skb);
374 extern void dccp_insert_option_elapsed_time(struct sock *sk,
375 struct sk_buff *skb,
376 u32 elapsed_time);
377 extern void dccp_insert_option_timestamp(struct sock *sk,
378 struct sk_buff *skb);
379 extern void dccp_insert_option(struct sock *sk, struct sk_buff *skb,
380 unsigned char option,
381 const void *value, unsigned char len);
382
383 extern struct socket *dccp_ctl_socket;
384
385 extern void dccp_timestamp(const struct sock *sk, struct timeval *tv);
386
387 static inline suseconds_t timeval_usecs(const struct timeval *tv)
388 {
389 return tv->tv_sec * USEC_PER_SEC + tv->tv_usec;
390 }
391
392 static inline suseconds_t timeval_delta(const struct timeval *large,
393 const struct timeval *small)
394 {
395 time_t secs = large->tv_sec - small->tv_sec;
396 suseconds_t usecs = large->tv_usec - small->tv_usec;
397
398 if (usecs < 0) {
399 secs--;
400 usecs += USEC_PER_SEC;
401 }
402 return secs * USEC_PER_SEC + usecs;
403 }
404
405 static inline void timeval_add_usecs(struct timeval *tv,
406 const suseconds_t usecs)
407 {
408 tv->tv_usec += usecs;
409 while (tv->tv_usec >= USEC_PER_SEC) {
410 tv->tv_sec++;
411 tv->tv_usec -= USEC_PER_SEC;
412 }
413 }
414
415 static inline void timeval_sub_usecs(struct timeval *tv,
416 const suseconds_t usecs)
417 {
418 tv->tv_usec -= usecs;
419 while (tv->tv_usec < 0) {
420 tv->tv_sec--;
421 tv->tv_usec += USEC_PER_SEC;
422 }
423 }
424
425 #endif /* _DCCP_H */
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