projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
[DCCP]: Introduce DCCP_{BUG{_ON},CRIT} macros, use enum:8 for the ccid3 states
[deliverable/linux.git] / net / dccp / dccp.h
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) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.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/dccp.h>
16 #include <net/snmp.h>
17 #include <net/sock.h>
18 #include <net/tcp.h>
19 #include "ackvec.h"
20
21 #define DCCP_CRIT(fmt, a...) LIMIT_NETDEBUG(KERN_CRIT fmt " at %s:%d/%s()\n", \
22 ##a, __FILE__, __LINE__, __FUNCTION__)
23 #define DCCP_BUG(fmt, a...) do { DCCP_CRIT(fmt, ##a); dump_stack(); } while (0)
24 #define DCCP_BUG_ON(cond) do { if (unlikely((cond) == 0)) \
25 DCCP_BUG("BUG: condition \"%s\" fails",\
26 __stringify((cond))); \
27 } while (0)
28
29 #ifdef CONFIG_IP_DCCP_DEBUG
30 extern int dccp_debug;
31
32 #define dccp_pr_debug(format, a...) \
33 do { if (dccp_debug) \
34 printk(KERN_DEBUG "%s: " format, __FUNCTION__ , ##a); \
35 } while (0)
36 #define dccp_pr_debug_cat(format, a...) do { if (dccp_debug) \
37 printk(format, ##a); } while (0)
38 #else
39 #define dccp_pr_debug(format, a...)
40 #define dccp_pr_debug_cat(format, a...)
41 #endif
42
43 extern struct inet_hashinfo dccp_hashinfo;
44
45 extern atomic_t dccp_orphan_count;
46
47 extern void dccp_time_wait(struct sock *sk, int state, int timeo);
48
49 /*
50 * Set safe upper bounds for header and option length. Since Data Offset is 8
51 * bits (RFC 4340, sec. 5.1), the total header length can never be more than
52 * 4 * 255 = 1020 bytes. The largest possible header length is 28 bytes (X=1):
53 * - DCCP-Response with ACK Subheader and 4 bytes of Service code OR
54 * - DCCP-Reset with ACK Subheader and 4 bytes of Reset Code fields
55 * Hence a safe upper bound for the maximum option length is 1020-28 = 992
56 */
57 #define MAX_DCCP_SPECIFIC_HEADER (255 * sizeof(int))
58 #define DCCP_MAX_PACKET_HDR 28
59 #define DCCP_MAX_OPT_LEN (MAX_DCCP_SPECIFIC_HEADER - DCCP_MAX_PACKET_HDR)
60 #define MAX_DCCP_HEADER (MAX_DCCP_SPECIFIC_HEADER + MAX_HEADER)
61
62 #define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT
63 * state, about 60 seconds */
64
65 /* RFC 1122, 4.2.3.1 initial RTO value */
66 #define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ))
67
68 /* Maximal interval between probes for local resources. */
69 #define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U))
70
71 #define DCCP_RTO_MAX ((unsigned)(120 * HZ)) /* FIXME: using TCP value */
72
73 #define DCCP_XMIT_TIMEO 30000 /* Time/msecs for blocking transmit per packet */
74
75 /* sysctl variables for DCCP */
76 extern int sysctl_dccp_request_retries;
77 extern int sysctl_dccp_retries1;
78 extern int sysctl_dccp_retries2;
79 extern int sysctl_dccp_feat_sequence_window;
80 extern int sysctl_dccp_feat_rx_ccid;
81 extern int sysctl_dccp_feat_tx_ccid;
82 extern int sysctl_dccp_feat_ack_ratio;
83 extern int sysctl_dccp_feat_send_ack_vector;
84 extern int sysctl_dccp_feat_send_ndp_count;
85
86 /* is seq1 < seq2 ? */
87 static inline int before48(const u64 seq1, const u64 seq2)
88 {
89 return (s64)((seq1 << 16) - (seq2 << 16)) < 0;
90 }
91
92 /* is seq1 > seq2 ? */
93 static inline int after48(const u64 seq1, const u64 seq2)
94 {
95 return (s64)((seq2 << 16) - (seq1 << 16)) < 0;
96 }
97
98 /* is seq2 <= seq1 <= seq3 ? */
99 static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3)
100 {
101 return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16);
102 }
103
104 static inline u64 max48(const u64 seq1, const u64 seq2)
105 {
106 return after48(seq1, seq2) ? seq1 : seq2;
107 }
108
109 /* is seq1 next seqno after seq2 */
110 static inline int follows48(const u64 seq1, const u64 seq2)
111 {
112 int diff = (seq1 & 0xFFFF) - (seq2 & 0xFFFF);
113
114 return diff==1;
115 }
116
117 enum {
118 DCCP_MIB_NUM = 0,
119 DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */
120 DCCP_MIB_ESTABRESETS, /* EstabResets */
121 DCCP_MIB_CURRESTAB, /* CurrEstab */
122 DCCP_MIB_OUTSEGS, /* OutSegs */
123 DCCP_MIB_OUTRSTS,
124 DCCP_MIB_ABORTONTIMEOUT,
125 DCCP_MIB_TIMEOUTS,
126 DCCP_MIB_ABORTFAILED,
127 DCCP_MIB_PASSIVEOPENS,
128 DCCP_MIB_ATTEMPTFAILS,
129 DCCP_MIB_OUTDATAGRAMS,
130 DCCP_MIB_INERRS,
131 DCCP_MIB_OPTMANDATORYERROR,
132 DCCP_MIB_INVALIDOPT,
133 __DCCP_MIB_MAX
134 };
135
136 #define DCCP_MIB_MAX __DCCP_MIB_MAX
137 struct dccp_mib {
138 unsigned long mibs[DCCP_MIB_MAX];
139 } __SNMP_MIB_ALIGN__;
140
141 DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics);
142 #define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field)
143 #define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field)
144 #define DCCP_INC_STATS_USER(field) SNMP_INC_STATS_USER(dccp_statistics, field)
145 #define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field)
146 #define DCCP_ADD_STATS_BH(field, val) \
147 SNMP_ADD_STATS_BH(dccp_statistics, field, val)
148 #define DCCP_ADD_STATS_USER(field, val) \
149 SNMP_ADD_STATS_USER(dccp_statistics, field, val)
150
151 /*
152 * Checksumming routines
153 */
154 static inline int dccp_csum_coverage(const struct sk_buff *skb)
155 {
156 const struct dccp_hdr* dh = dccp_hdr(skb);
157
158 if (dh->dccph_cscov == 0)
159 return skb->len;
160 return (dh->dccph_doff + dh->dccph_cscov - 1) * sizeof(u32);
161 }
162
163 static inline void dccp_csum_outgoing(struct sk_buff *skb)
164 {
165 int cov = dccp_csum_coverage(skb);
166
167 if (cov >= skb->len)
168 dccp_hdr(skb)->dccph_cscov = 0;
169
170 skb->csum = skb_checksum(skb, 0, (cov > skb->len)? skb->len : cov, 0);
171 }
172
173 extern void dccp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb);
174
175 extern int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb);
176
177 extern void dccp_send_ack(struct sock *sk);
178 extern void dccp_send_delayed_ack(struct sock *sk);
179 extern void dccp_reqsk_send_ack(struct sk_buff *sk, struct request_sock *rsk);
180
181 extern void dccp_send_sync(struct sock *sk, const u64 seq,
182 const enum dccp_pkt_type pkt_type);
183
184 extern void dccp_write_xmit(struct sock *sk, int block);
185 extern void dccp_write_space(struct sock *sk);
186
187 extern void dccp_init_xmit_timers(struct sock *sk);
188 static inline void dccp_clear_xmit_timers(struct sock *sk)
189 {
190 inet_csk_clear_xmit_timers(sk);
191 }
192
193 extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu);
194
195 extern const char *dccp_packet_name(const int type);
196 extern const char *dccp_state_name(const int state);
197
198 extern void dccp_set_state(struct sock *sk, const int state);
199 extern void dccp_done(struct sock *sk);
200
201 extern void dccp_reqsk_init(struct request_sock *req, struct sk_buff *skb);
202
203 extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb);
204
205 extern struct sock *dccp_create_openreq_child(struct sock *sk,
206 const struct request_sock *req,
207 const struct sk_buff *skb);
208
209 extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb);
210
211 extern struct sock *dccp_v4_request_recv_sock(struct sock *sk,
212 struct sk_buff *skb,
213 struct request_sock *req,
214 struct dst_entry *dst);
215 extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb,
216 struct request_sock *req,
217 struct request_sock **prev);
218
219 extern int dccp_child_process(struct sock *parent, struct sock *child,
220 struct sk_buff *skb);
221 extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
222 struct dccp_hdr *dh, unsigned len);
223 extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
224 const struct dccp_hdr *dh, const unsigned len);
225
226 extern int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized);
227 extern int dccp_destroy_sock(struct sock *sk);
228
229 extern void dccp_close(struct sock *sk, long timeout);
230 extern struct sk_buff *dccp_make_response(struct sock *sk,
231 struct dst_entry *dst,
232 struct request_sock *req);
233
234 extern int dccp_connect(struct sock *sk);
235 extern int dccp_disconnect(struct sock *sk, int flags);
236 extern void dccp_hash(struct sock *sk);
237 extern void dccp_unhash(struct sock *sk);
238 extern int dccp_getsockopt(struct sock *sk, int level, int optname,
239 char __user *optval, int __user *optlen);
240 extern int dccp_setsockopt(struct sock *sk, int level, int optname,
241 char __user *optval, int optlen);
242 #ifdef CONFIG_COMPAT
243 extern int compat_dccp_getsockopt(struct sock *sk,
244 int level, int optname,
245 char __user *optval, int __user *optlen);
246 extern int compat_dccp_setsockopt(struct sock *sk,
247 int level, int optname,
248 char __user *optval, int optlen);
249 #endif
250 extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg);
251 extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk,
252 struct msghdr *msg, size_t size);
253 extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk,
254 struct msghdr *msg, size_t len, int nonblock,
255 int flags, int *addr_len);
256 extern void dccp_shutdown(struct sock *sk, int how);
257 extern int inet_dccp_listen(struct socket *sock, int backlog);
258 extern unsigned int dccp_poll(struct file *file, struct socket *sock,
259 poll_table *wait);
260 extern int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr,
261 int addr_len);
262
263 extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code);
264 extern void dccp_send_close(struct sock *sk, const int active);
265 extern int dccp_invalid_packet(struct sk_buff *skb);
266
267 static inline int dccp_bad_service_code(const struct sock *sk,
268 const __be32 service)
269 {
270 const struct dccp_sock *dp = dccp_sk(sk);
271
272 if (dp->dccps_service == service)
273 return 0;
274 return !dccp_list_has_service(dp->dccps_service_list, service);
275 }
276
277 struct dccp_skb_cb {
278 __u8 dccpd_type:4;
279 __u8 dccpd_ccval:4;
280 __u8 dccpd_reset_code;
281 __u16 dccpd_opt_len;
282 __u64 dccpd_seq;
283 __u64 dccpd_ack_seq;
284 };
285
286 #define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0]))
287
288 static inline int dccp_non_data_packet(const struct sk_buff *skb)
289 {
290 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
291
292 return type == DCCP_PKT_ACK ||
293 type == DCCP_PKT_CLOSE ||
294 type == DCCP_PKT_CLOSEREQ ||
295 type == DCCP_PKT_RESET ||
296 type == DCCP_PKT_SYNC ||
297 type == DCCP_PKT_SYNCACK;
298 }
299
300 static inline int dccp_packet_without_ack(const struct sk_buff *skb)
301 {
302 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
303
304 return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST;
305 }
306
307 #define DCCP_MAX_SEQNO ((((u64)1) << 48) - 1)
308 #define DCCP_PKT_WITHOUT_ACK_SEQ (DCCP_MAX_SEQNO << 2)
309
310 static inline void dccp_set_seqno(u64 *seqno, u64 value)
311 {
312 if (value > DCCP_MAX_SEQNO)
313 value -= DCCP_MAX_SEQNO + 1;
314 *seqno = value;
315 }
316
317 static inline u64 dccp_delta_seqno(u64 seqno1, u64 seqno2)
318 {
319 return ((seqno2 << 16) - (seqno1 << 16)) >> 16;
320 }
321
322 static inline void dccp_inc_seqno(u64 *seqno)
323 {
324 if (++*seqno > DCCP_MAX_SEQNO)
325 *seqno = 0;
326 }
327
328 static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss)
329 {
330 struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh +
331 sizeof(*dh));
332 dh->dccph_seq2 = 0;
333 dh->dccph_seq = htons((gss >> 32) & 0xfffff);
334 dhx->dccph_seq_low = htonl(gss & 0xffffffff);
335 }
336
337 static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack,
338 const u64 gsr)
339 {
340 dhack->dccph_reserved1 = 0;
341 dhack->dccph_ack_nr_high = htons(gsr >> 32);
342 dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff);
343 }
344
345 static inline void dccp_update_gsr(struct sock *sk, u64 seq)
346 {
347 struct dccp_sock *dp = dccp_sk(sk);
348 const struct dccp_minisock *dmsk = dccp_msk(sk);
349
350 dp->dccps_gsr = seq;
351 dccp_set_seqno(&dp->dccps_swl,
352 dp->dccps_gsr + 1 - (dmsk->dccpms_sequence_window / 4));
353 dccp_set_seqno(&dp->dccps_swh,
354 dp->dccps_gsr + (3 * dmsk->dccpms_sequence_window) / 4);
355 }
356
357 static inline void dccp_update_gss(struct sock *sk, u64 seq)
358 {
359 struct dccp_sock *dp = dccp_sk(sk);
360
361 dp->dccps_awh = dp->dccps_gss = seq;
362 dccp_set_seqno(&dp->dccps_awl,
363 (dp->dccps_gss -
364 dccp_msk(sk)->dccpms_sequence_window + 1));
365 }
366
367 static inline int dccp_ack_pending(const struct sock *sk)
368 {
369 const struct dccp_sock *dp = dccp_sk(sk);
370 return dp->dccps_timestamp_echo != 0 ||
371 #ifdef CONFIG_IP_DCCP_ACKVEC
372 (dccp_msk(sk)->dccpms_send_ack_vector &&
373 dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) ||
374 #endif
375 inet_csk_ack_scheduled(sk);
376 }
377
378 extern int dccp_insert_options(struct sock *sk, struct sk_buff *skb);
379 extern int dccp_insert_option_elapsed_time(struct sock *sk,
380 struct sk_buff *skb,
381 u32 elapsed_time);
382 extern int dccp_insert_option_timestamp(struct sock *sk,
383 struct sk_buff *skb);
384 extern int dccp_insert_option(struct sock *sk, struct sk_buff *skb,
385 unsigned char option,
386 const void *value, unsigned char len);
387
388 extern void dccp_timestamp(const struct sock *sk, struct timeval *tv);
389
390 static inline suseconds_t timeval_usecs(const struct timeval *tv)
391 {
392 return tv->tv_sec * USEC_PER_SEC + tv->tv_usec;
393 }
394
395 static inline suseconds_t timeval_delta(const struct timeval *large,
396 const struct timeval *small)
397 {
398 time_t secs = large->tv_sec - small->tv_sec;
399 suseconds_t usecs = large->tv_usec - small->tv_usec;
400
401 if (usecs < 0) {
402 secs--;
403 usecs += USEC_PER_SEC;
404 }
405 return secs * USEC_PER_SEC + usecs;
406 }
407
408 static inline void timeval_add_usecs(struct timeval *tv,
409 const suseconds_t usecs)
410 {
411 tv->tv_usec += usecs;
412 while (tv->tv_usec >= USEC_PER_SEC) {
413 tv->tv_sec++;
414 tv->tv_usec -= USEC_PER_SEC;
415 }
416 }
417
418 static inline void timeval_sub_usecs(struct timeval *tv,
419 const suseconds_t usecs)
420 {
421 tv->tv_usec -= usecs;
422 while (tv->tv_usec < 0) {
423 tv->tv_sec--;
424 tv->tv_usec += USEC_PER_SEC;
425 }
426 }
427
428 #ifdef CONFIG_SYSCTL
429 extern int dccp_sysctl_init(void);
430 extern void dccp_sysctl_exit(void);
431 #else
432 static inline int dccp_sysctl_init(void)
433 {
434 return 0;
435 }
436
437 static inline void dccp_sysctl_exit(void)
438 {
439 }
440 #endif
441
442 #endif /* _DCCP_H */
Linux kernel - Deliverables
This page took 0.110192 seconds and 5 git commands to generate.