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Driver core: convert block from raw kobjects to core devices
[linux-2.6/mini2440.git] / net / dccp / dccp.h
blobee97950d77d1993bdc53ddb1609bbd804342b150
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 <linux/ktime.h>
17 #include <net/snmp.h>
18 #include <net/sock.h>
19 #include <net/tcp.h>
20 #include "ackvec.h"
21
22 /*
23 * DCCP - specific warning and debugging macros.
24 */
25 #define DCCP_WARN(fmt, a...) LIMIT_NETDEBUG(KERN_WARNING "%s: " fmt, \
26 __FUNCTION__, ##a)
27 #define DCCP_CRIT(fmt, a...) printk(KERN_CRIT fmt " at %s:%d/%s()\n", ##a, \
28 __FILE__, __LINE__, __FUNCTION__)
29 #define DCCP_BUG(a...) do { DCCP_CRIT("BUG: " a); dump_stack(); } while(0)
30 #define DCCP_BUG_ON(cond) do { if (unlikely((cond) != 0)) \
31 DCCP_BUG("\"%s\" holds (exception!)", \
32 __stringify(cond)); \
33 } while (0)
34
35 #define DCCP_PRINTK(enable, fmt, args...) do { if (enable) \
36 printk(fmt, ##args); \
37 } while(0)
38 #define DCCP_PR_DEBUG(enable, fmt, a...) DCCP_PRINTK(enable, KERN_DEBUG \
39 "%s: " fmt, __FUNCTION__, ##a)
40
41 #ifdef CONFIG_IP_DCCP_DEBUG
42 extern int dccp_debug;
43 #define dccp_pr_debug(format, a...) DCCP_PR_DEBUG(dccp_debug, format, ##a)
44 #define dccp_pr_debug_cat(format, a...) DCCP_PRINTK(dccp_debug, format, ##a)
45 #else
46 #define dccp_pr_debug(format, a...)
47 #define dccp_pr_debug_cat(format, a...)
48 #endif
49
50 extern struct inet_hashinfo dccp_hashinfo;
51
52 extern atomic_t dccp_orphan_count;
53
54 extern void dccp_time_wait(struct sock *sk, int state, int timeo);
55
56 /*
57 * Set safe upper bounds for header and option length. Since Data Offset is 8
58 * bits (RFC 4340, sec. 5.1), the total header length can never be more than
59 * 4 * 255 = 1020 bytes. The largest possible header length is 28 bytes (X=1):
60 * - DCCP-Response with ACK Subheader and 4 bytes of Service code OR
61 * - DCCP-Reset with ACK Subheader and 4 bytes of Reset Code fields
62 * Hence a safe upper bound for the maximum option length is 1020-28 = 992
63 */
64 #define MAX_DCCP_SPECIFIC_HEADER (255 * sizeof(int))
65 #define DCCP_MAX_PACKET_HDR 28
66 #define DCCP_MAX_OPT_LEN (MAX_DCCP_SPECIFIC_HEADER - DCCP_MAX_PACKET_HDR)
67 #define MAX_DCCP_HEADER (MAX_DCCP_SPECIFIC_HEADER + MAX_HEADER)
68
69 #define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT
70 * state, about 60 seconds */
71
72 /* RFC 1122, 4.2.3.1 initial RTO value */
73 #define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ))
74
75 #define DCCP_RTO_MAX ((unsigned)(120 * HZ)) /* FIXME: using TCP value */
76
77 /* bounds for sampled RTT values from packet exchanges (in usec) */
78 #define DCCP_SANE_RTT_MIN 100
79 #define DCCP_SANE_RTT_MAX (4 * USEC_PER_SEC)
80
81 /* Maximal interval between probes for local resources. */
82 #define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U))
83
84 /* sysctl variables for DCCP */
85 extern int sysctl_dccp_request_retries;
86 extern int sysctl_dccp_retries1;
87 extern int sysctl_dccp_retries2;
88 extern int sysctl_dccp_feat_sequence_window;
89 extern int sysctl_dccp_feat_rx_ccid;
90 extern int sysctl_dccp_feat_tx_ccid;
91 extern int sysctl_dccp_feat_ack_ratio;
92 extern int sysctl_dccp_feat_send_ack_vector;
93 extern int sysctl_dccp_feat_send_ndp_count;
94 extern int sysctl_dccp_tx_qlen;
95 extern int sysctl_dccp_sync_ratelimit;
96
97 /*
98 * 48-bit sequence number arithmetic (signed and unsigned)
99 */
100 #define INT48_MIN 0x800000000000LL /* 2^47 */
101 #define UINT48_MAX 0xFFFFFFFFFFFFLL /* 2^48 - 1 */
102 #define COMPLEMENT48(x) (0x1000000000000LL - (x)) /* 2^48 - x */
103 #define TO_SIGNED48(x) (((x) < INT48_MIN)? (x) : -COMPLEMENT48( (x)))
104 #define TO_UNSIGNED48(x) (((x) >= 0)? (x) : COMPLEMENT48(-(x)))
105 #define ADD48(a, b) (((a) + (b)) & UINT48_MAX)
106 #define SUB48(a, b) ADD48((a), COMPLEMENT48(b))
107
108 static inline void dccp_set_seqno(u64 *seqno, u64 value)
109 {
110 *seqno = value & UINT48_MAX;
111 }
112
113 static inline void dccp_inc_seqno(u64 *seqno)
114 {
115 *seqno = ADD48(*seqno, 1);
116 }
117
118 /* signed mod-2^48 distance: pos. if seqno1 < seqno2, neg. if seqno1 > seqno2 */
119 static inline s64 dccp_delta_seqno(const u64 seqno1, const u64 seqno2)
120 {
121 u64 delta = SUB48(seqno2, seqno1);
122
123 return TO_SIGNED48(delta);
124 }
125
126 /* is seq1 < seq2 ? */
127 static inline int before48(const u64 seq1, const u64 seq2)
128 {
129 return (s64)((seq2 << 16) - (seq1 << 16)) > 0;
130 }
131
132 /* is seq1 > seq2 ? */
133 #define after48(seq1, seq2) before48(seq2, seq1)
134
135 /* is seq2 <= seq1 <= seq3 ? */
136 static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3)
137 {
138 return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16);
139 }
140
141 static inline u64 max48(const u64 seq1, const u64 seq2)
142 {
143 return after48(seq1, seq2) ? seq1 : seq2;
144 }
145
146 /* is seq1 next seqno after seq2 */
147 static inline int follows48(const u64 seq1, const u64 seq2)
148 {
149 return dccp_delta_seqno(seq2, seq1) == 1;
150 }
151
152 enum {
153 DCCP_MIB_NUM = 0,
154 DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */
155 DCCP_MIB_ESTABRESETS, /* EstabResets */
156 DCCP_MIB_CURRESTAB, /* CurrEstab */
157 DCCP_MIB_OUTSEGS, /* OutSegs */
158 DCCP_MIB_OUTRSTS,
159 DCCP_MIB_ABORTONTIMEOUT,
160 DCCP_MIB_TIMEOUTS,
161 DCCP_MIB_ABORTFAILED,
162 DCCP_MIB_PASSIVEOPENS,
163 DCCP_MIB_ATTEMPTFAILS,
164 DCCP_MIB_OUTDATAGRAMS,
165 DCCP_MIB_INERRS,
166 DCCP_MIB_OPTMANDATORYERROR,
167 DCCP_MIB_INVALIDOPT,
168 __DCCP_MIB_MAX
169 };
170
171 #define DCCP_MIB_MAX __DCCP_MIB_MAX
172 struct dccp_mib {
173 unsigned long mibs[DCCP_MIB_MAX];
174 } __SNMP_MIB_ALIGN__;
175
176 DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics);
177 #define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field)
178 #define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field)
179 #define DCCP_INC_STATS_USER(field) SNMP_INC_STATS_USER(dccp_statistics, field)
180 #define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field)
181 #define DCCP_ADD_STATS_BH(field, val) \
182 SNMP_ADD_STATS_BH(dccp_statistics, field, val)
183 #define DCCP_ADD_STATS_USER(field, val) \
184 SNMP_ADD_STATS_USER(dccp_statistics, field, val)
185
186 /*
187 * Checksumming routines
188 */
189 static inline unsigned int dccp_csum_coverage(const struct sk_buff *skb)
190 {
191 const struct dccp_hdr* dh = dccp_hdr(skb);
192
193 if (dh->dccph_cscov == 0)
194 return skb->len;
195 return (dh->dccph_doff + dh->dccph_cscov - 1) * sizeof(u32);
196 }
197
198 static inline void dccp_csum_outgoing(struct sk_buff *skb)
199 {
200 unsigned int cov = dccp_csum_coverage(skb);
201
202 if (cov >= skb->len)
203 dccp_hdr(skb)->dccph_cscov = 0;
204
205 skb->csum = skb_checksum(skb, 0, (cov > skb->len)? skb->len : cov, 0);
206 }
207
208 extern void dccp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb);
209
210 extern int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb);
211
212 extern void dccp_send_ack(struct sock *sk);
213 extern void dccp_reqsk_send_ack(struct sk_buff *sk, struct request_sock *rsk);
214
215 extern void dccp_send_sync(struct sock *sk, const u64 seq,
216 const enum dccp_pkt_type pkt_type);
217
218 extern void dccp_write_xmit(struct sock *sk, int block);
219 extern void dccp_write_space(struct sock *sk);
220
221 extern void dccp_init_xmit_timers(struct sock *sk);
222 static inline void dccp_clear_xmit_timers(struct sock *sk)
223 {
224 inet_csk_clear_xmit_timers(sk);
225 }
226
227 extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu);
228
229 extern const char *dccp_packet_name(const int type);
230 extern const char *dccp_state_name(const int state);
231
232 extern void dccp_set_state(struct sock *sk, const int state);
233 extern void dccp_done(struct sock *sk);
234
235 extern void dccp_reqsk_init(struct request_sock *req, struct sk_buff *skb);
236
237 extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb);
238
239 extern struct sock *dccp_create_openreq_child(struct sock *sk,
240 const struct request_sock *req,
241 const struct sk_buff *skb);
242
243 extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb);
244
245 extern struct sock *dccp_v4_request_recv_sock(struct sock *sk,
246 struct sk_buff *skb,
247 struct request_sock *req,
248 struct dst_entry *dst);
249 extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb,
250 struct request_sock *req,
251 struct request_sock **prev);
252
253 extern int dccp_child_process(struct sock *parent, struct sock *child,
254 struct sk_buff *skb);
255 extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
256 struct dccp_hdr *dh, unsigned len);
257 extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
258 const struct dccp_hdr *dh, const unsigned len);
259
260 extern int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized);
261 extern int dccp_destroy_sock(struct sock *sk);
262
263 extern void dccp_close(struct sock *sk, long timeout);
264 extern struct sk_buff *dccp_make_response(struct sock *sk,
265 struct dst_entry *dst,
266 struct request_sock *req);
267
268 extern int dccp_connect(struct sock *sk);
269 extern int dccp_disconnect(struct sock *sk, int flags);
270 extern void dccp_hash(struct sock *sk);
271 extern void dccp_unhash(struct sock *sk);
272 extern int dccp_getsockopt(struct sock *sk, int level, int optname,
273 char __user *optval, int __user *optlen);
274 extern int dccp_setsockopt(struct sock *sk, int level, int optname,
275 char __user *optval, int optlen);
276 #ifdef CONFIG_COMPAT
277 extern int compat_dccp_getsockopt(struct sock *sk,
278 int level, int optname,
279 char __user *optval, int __user *optlen);
280 extern int compat_dccp_setsockopt(struct sock *sk,
281 int level, int optname,
282 char __user *optval, int optlen);
283 #endif
284 extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg);
285 extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk,
286 struct msghdr *msg, size_t size);
287 extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk,
288 struct msghdr *msg, size_t len, int nonblock,
289 int flags, int *addr_len);
290 extern void dccp_shutdown(struct sock *sk, int how);
291 extern int inet_dccp_listen(struct socket *sock, int backlog);
292 extern unsigned int dccp_poll(struct file *file, struct socket *sock,
293 poll_table *wait);
294 extern int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr,
295 int addr_len);
296
297 extern struct sk_buff *dccp_ctl_make_reset(struct socket *ctl,
298 struct sk_buff *skb);
299 extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code);
300 extern void dccp_send_close(struct sock *sk, const int active);
301 extern int dccp_invalid_packet(struct sk_buff *skb);
302 extern u32 dccp_sample_rtt(struct sock *sk, long delta);
303
304 static inline int dccp_bad_service_code(const struct sock *sk,
305 const __be32 service)
306 {
307 const struct dccp_sock *dp = dccp_sk(sk);
308
309 if (dp->dccps_service == service)
310 return 0;
311 return !dccp_list_has_service(dp->dccps_service_list, service);
312 }
313
314 /**
315 * dccp_skb_cb - DCCP per-packet control information
316 * @dccpd_type: one of %dccp_pkt_type (or unknown)
317 * @dccpd_ccval: CCVal field (5.1), see e.g. RFC 4342, 8.1
318 * @dccpd_reset_code: one of %dccp_reset_codes
319 * @dccpd_reset_data: Data1..3 fields (depend on @dccpd_reset_code)
320 * @dccpd_opt_len: total length of all options (5.8) in the packet
321 * @dccpd_seq: sequence number
322 * @dccpd_ack_seq: acknowledgment number subheader field value
323 * This is used for transmission as well as for reception.
324 */
325 struct dccp_skb_cb {
326 __u8 dccpd_type:4;
327 __u8 dccpd_ccval:4;
328 __u8 dccpd_reset_code,
329 dccpd_reset_data[3];
330 __u16 dccpd_opt_len;
331 __u64 dccpd_seq;
332 __u64 dccpd_ack_seq;
333 };
334
335 #define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0]))
336
337 static inline int dccp_non_data_packet(const struct sk_buff *skb)
338 {
339 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
340
341 return type == DCCP_PKT_ACK ||
342 type == DCCP_PKT_CLOSE ||
343 type == DCCP_PKT_CLOSEREQ ||
344 type == DCCP_PKT_RESET ||
345 type == DCCP_PKT_SYNC ||
346 type == DCCP_PKT_SYNCACK;
347 }
348
349 static inline int dccp_packet_without_ack(const struct sk_buff *skb)
350 {
351 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
352
353 return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST;
354 }
355
356 #define DCCP_PKT_WITHOUT_ACK_SEQ (UINT48_MAX << 2)
357
358 static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss)
359 {
360 struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh +
361 sizeof(*dh));
362 dh->dccph_seq2 = 0;
363 dh->dccph_seq = htons((gss >> 32) & 0xfffff);
364 dhx->dccph_seq_low = htonl(gss & 0xffffffff);
365 }
366
367 static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack,
368 const u64 gsr)
369 {
370 dhack->dccph_reserved1 = 0;
371 dhack->dccph_ack_nr_high = htons(gsr >> 32);
372 dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff);
373 }
374
375 static inline void dccp_update_gsr(struct sock *sk, u64 seq)
376 {
377 struct dccp_sock *dp = dccp_sk(sk);
378 const struct dccp_minisock *dmsk = dccp_msk(sk);
379
380 dp->dccps_gsr = seq;
381 dccp_set_seqno(&dp->dccps_swl,
382 dp->dccps_gsr + 1 - (dmsk->dccpms_sequence_window / 4));
383 dccp_set_seqno(&dp->dccps_swh,
384 dp->dccps_gsr + (3 * dmsk->dccpms_sequence_window) / 4);
385 }
386
387 static inline void dccp_update_gss(struct sock *sk, u64 seq)
388 {
389 struct dccp_sock *dp = dccp_sk(sk);
390
391 dp->dccps_awh = dp->dccps_gss = seq;
392 dccp_set_seqno(&dp->dccps_awl,
393 (dp->dccps_gss -
394 dccp_msk(sk)->dccpms_sequence_window + 1));
395 }
396
397 static inline int dccp_ack_pending(const struct sock *sk)
398 {
399 const struct dccp_sock *dp = dccp_sk(sk);
400 return dp->dccps_timestamp_echo != 0 ||
401 #ifdef CONFIG_IP_DCCP_ACKVEC
402 (dccp_msk(sk)->dccpms_send_ack_vector &&
403 dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) ||
404 #endif
405 inet_csk_ack_scheduled(sk);
406 }
407
408 extern int dccp_insert_options(struct sock *sk, struct sk_buff *skb);
409 extern int dccp_insert_option_elapsed_time(struct sock *sk,
410 struct sk_buff *skb,
411 u32 elapsed_time);
412 extern u32 dccp_timestamp(void);
413 extern void dccp_timestamping_init(void);
414 extern int dccp_insert_option_timestamp(struct sock *sk,
415 struct sk_buff *skb);
416 extern int dccp_insert_option(struct sock *sk, struct sk_buff *skb,
417 unsigned char option,
418 const void *value, unsigned char len);
419
420 #ifdef CONFIG_SYSCTL
421 extern int dccp_sysctl_init(void);
422 extern void dccp_sysctl_exit(void);
423 #else
424 static inline int dccp_sysctl_init(void)
425 {
426 return 0;
427 }
428
429 static inline void dccp_sysctl_exit(void)
430 {
431 }
432 #endif
433
434 #endif /* _DCCP_H */
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