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[NETFILTER]: nf_nat: add FTP NAT helper port
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / dccp / dccp.h
blob68886986c8e4006165ff3fffc3f6c7138c4e5546
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 /*
22 * DCCP - specific warning and debugging macros.
23 */
24 #define DCCP_WARN(fmt, a...) LIMIT_NETDEBUG(KERN_WARNING "%s: " fmt, \
25 __FUNCTION__, ##a)
26 #define DCCP_CRIT(fmt, a...) printk(KERN_CRIT fmt " at %s:%d/%s()\n", ##a, \
27 __FILE__, __LINE__, __FUNCTION__)
28 #define DCCP_BUG(a...) do { DCCP_CRIT("BUG: " a); dump_stack(); } while(0)
29 #define DCCP_BUG_ON(cond) do { if (unlikely((cond) != 0)) \
30 DCCP_BUG("\"%s\" holds (exception!)", \
31 __stringify(cond)); \
32 } while (0)
33
34 #ifdef MODULE
35 #define DCCP_PRINTK(enable, fmt, args...) do { if (enable) \
36 printk(fmt, ##args); \
37 } while(0)
38 #else
39 #define DCCP_PRINTK(enable, fmt, args...) printk(fmt, ##args)
40 #endif
41 #define DCCP_PR_DEBUG(enable, fmt, a...) DCCP_PRINTK(enable, KERN_DEBUG \
42 "%s: " fmt, __FUNCTION__, ##a)
43
44 #ifdef CONFIG_IP_DCCP_DEBUG
45 extern int dccp_debug;
46 #define dccp_pr_debug(format, a...) DCCP_PR_DEBUG(dccp_debug, format, ##a)
47 #define dccp_pr_debug_cat(format, a...) DCCP_PRINTK(dccp_debug, format, ##a)
48 #else
49 #define dccp_pr_debug(format, a...)
50 #define dccp_pr_debug_cat(format, a...)
51 #endif
52
53 extern struct inet_hashinfo dccp_hashinfo;
54
55 extern atomic_t dccp_orphan_count;
56
57 extern void dccp_time_wait(struct sock *sk, int state, int timeo);
58
59 /*
60 * Set safe upper bounds for header and option length. Since Data Offset is 8
61 * bits (RFC 4340, sec. 5.1), the total header length can never be more than
62 * 4 * 255 = 1020 bytes. The largest possible header length is 28 bytes (X=1):
63 * - DCCP-Response with ACK Subheader and 4 bytes of Service code OR
64 * - DCCP-Reset with ACK Subheader and 4 bytes of Reset Code fields
65 * Hence a safe upper bound for the maximum option length is 1020-28 = 992
66 */
67 #define MAX_DCCP_SPECIFIC_HEADER (255 * sizeof(int))
68 #define DCCP_MAX_PACKET_HDR 28
69 #define DCCP_MAX_OPT_LEN (MAX_DCCP_SPECIFIC_HEADER - DCCP_MAX_PACKET_HDR)
70 #define MAX_DCCP_HEADER (MAX_DCCP_SPECIFIC_HEADER + MAX_HEADER)
71
72 #define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT
73 * state, about 60 seconds */
74
75 /* RFC 1122, 4.2.3.1 initial RTO value */
76 #define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ))
77
78 /* Maximal interval between probes for local resources. */
79 #define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U))
80
81 #define DCCP_RTO_MAX ((unsigned)(120 * HZ)) /* FIXME: using TCP value */
82
83 #define DCCP_XMIT_TIMEO 30000 /* Time/msecs for blocking transmit per packet */
84
85 /* sysctl variables for DCCP */
86 extern int sysctl_dccp_request_retries;
87 extern int sysctl_dccp_retries1;
88 extern int sysctl_dccp_retries2;
89 extern int sysctl_dccp_feat_sequence_window;
90 extern int sysctl_dccp_feat_rx_ccid;
91 extern int sysctl_dccp_feat_tx_ccid;
92 extern int sysctl_dccp_feat_ack_ratio;
93 extern int sysctl_dccp_feat_send_ack_vector;
94 extern int sysctl_dccp_feat_send_ndp_count;
95 extern int sysctl_dccp_tx_qlen;
96
97 /* is seq1 < seq2 ? */
98 static inline int before48(const u64 seq1, const u64 seq2)
99 {
100 return (s64)((seq1 << 16) - (seq2 << 16)) < 0;
101 }
102
103 /* is seq1 > seq2 ? */
104 static inline int after48(const u64 seq1, const u64 seq2)
105 {
106 return (s64)((seq2 << 16) - (seq1 << 16)) < 0;
107 }
108
109 /* is seq2 <= seq1 <= seq3 ? */
110 static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3)
111 {
112 return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16);
113 }
114
115 static inline u64 max48(const u64 seq1, const u64 seq2)
116 {
117 return after48(seq1, seq2) ? seq1 : seq2;
118 }
119
120 /* is seq1 next seqno after seq2 */
121 static inline int follows48(const u64 seq1, const u64 seq2)
122 {
123 int diff = (seq1 & 0xFFFF) - (seq2 & 0xFFFF);
124
125 return diff==1;
126 }
127
128 enum {
129 DCCP_MIB_NUM = 0,
130 DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */
131 DCCP_MIB_ESTABRESETS, /* EstabResets */
132 DCCP_MIB_CURRESTAB, /* CurrEstab */
133 DCCP_MIB_OUTSEGS, /* OutSegs */
134 DCCP_MIB_OUTRSTS,
135 DCCP_MIB_ABORTONTIMEOUT,
136 DCCP_MIB_TIMEOUTS,
137 DCCP_MIB_ABORTFAILED,
138 DCCP_MIB_PASSIVEOPENS,
139 DCCP_MIB_ATTEMPTFAILS,
140 DCCP_MIB_OUTDATAGRAMS,
141 DCCP_MIB_INERRS,
142 DCCP_MIB_OPTMANDATORYERROR,
143 DCCP_MIB_INVALIDOPT,
144 __DCCP_MIB_MAX
145 };
146
147 #define DCCP_MIB_MAX __DCCP_MIB_MAX
148 struct dccp_mib {
149 unsigned long mibs[DCCP_MIB_MAX];
150 } __SNMP_MIB_ALIGN__;
151
152 DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics);
153 #define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field)
154 #define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field)
155 #define DCCP_INC_STATS_USER(field) SNMP_INC_STATS_USER(dccp_statistics, field)
156 #define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field)
157 #define DCCP_ADD_STATS_BH(field, val) \
158 SNMP_ADD_STATS_BH(dccp_statistics, field, val)
159 #define DCCP_ADD_STATS_USER(field, val) \
160 SNMP_ADD_STATS_USER(dccp_statistics, field, val)
161
162 /*
163 * Checksumming routines
164 */
165 static inline int dccp_csum_coverage(const struct sk_buff *skb)
166 {
167 const struct dccp_hdr* dh = dccp_hdr(skb);
168
169 if (dh->dccph_cscov == 0)
170 return skb->len;
171 return (dh->dccph_doff + dh->dccph_cscov - 1) * sizeof(u32);
172 }
173
174 static inline void dccp_csum_outgoing(struct sk_buff *skb)
175 {
176 int cov = dccp_csum_coverage(skb);
177
178 if (cov >= skb->len)
179 dccp_hdr(skb)->dccph_cscov = 0;
180
181 skb->csum = skb_checksum(skb, 0, (cov > skb->len)? skb->len : cov, 0);
182 }
183
184 extern void dccp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb);
185
186 extern int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb);
187
188 extern void dccp_send_ack(struct sock *sk);
189 extern void dccp_send_delayed_ack(struct sock *sk);
190 extern void dccp_reqsk_send_ack(struct sk_buff *sk, struct request_sock *rsk);
191
192 extern void dccp_send_sync(struct sock *sk, const u64 seq,
193 const enum dccp_pkt_type pkt_type);
194
195 extern void dccp_write_xmit(struct sock *sk, int block);
196 extern void dccp_write_space(struct sock *sk);
197
198 extern void dccp_init_xmit_timers(struct sock *sk);
199 static inline void dccp_clear_xmit_timers(struct sock *sk)
200 {
201 inet_csk_clear_xmit_timers(sk);
202 }
203
204 extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu);
205
206 extern const char *dccp_packet_name(const int type);
207 extern const char *dccp_state_name(const int state);
208
209 extern void dccp_set_state(struct sock *sk, const int state);
210 extern void dccp_done(struct sock *sk);
211
212 extern void dccp_reqsk_init(struct request_sock *req, struct sk_buff *skb);
213
214 extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb);
215
216 extern struct sock *dccp_create_openreq_child(struct sock *sk,
217 const struct request_sock *req,
218 const struct sk_buff *skb);
219
220 extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb);
221
222 extern struct sock *dccp_v4_request_recv_sock(struct sock *sk,
223 struct sk_buff *skb,
224 struct request_sock *req,
225 struct dst_entry *dst);
226 extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb,
227 struct request_sock *req,
228 struct request_sock **prev);
229
230 extern int dccp_child_process(struct sock *parent, struct sock *child,
231 struct sk_buff *skb);
232 extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
233 struct dccp_hdr *dh, unsigned len);
234 extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
235 const struct dccp_hdr *dh, const unsigned len);
236
237 extern int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized);
238 extern int dccp_destroy_sock(struct sock *sk);
239
240 extern void dccp_close(struct sock *sk, long timeout);
241 extern struct sk_buff *dccp_make_response(struct sock *sk,
242 struct dst_entry *dst,
243 struct request_sock *req);
244
245 extern int dccp_connect(struct sock *sk);
246 extern int dccp_disconnect(struct sock *sk, int flags);
247 extern void dccp_hash(struct sock *sk);
248 extern void dccp_unhash(struct sock *sk);
249 extern int dccp_getsockopt(struct sock *sk, int level, int optname,
250 char __user *optval, int __user *optlen);
251 extern int dccp_setsockopt(struct sock *sk, int level, int optname,
252 char __user *optval, int optlen);
253 #ifdef CONFIG_COMPAT
254 extern int compat_dccp_getsockopt(struct sock *sk,
255 int level, int optname,
256 char __user *optval, int __user *optlen);
257 extern int compat_dccp_setsockopt(struct sock *sk,
258 int level, int optname,
259 char __user *optval, int optlen);
260 #endif
261 extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg);
262 extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk,
263 struct msghdr *msg, size_t size);
264 extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk,
265 struct msghdr *msg, size_t len, int nonblock,
266 int flags, int *addr_len);
267 extern void dccp_shutdown(struct sock *sk, int how);
268 extern int inet_dccp_listen(struct socket *sock, int backlog);
269 extern unsigned int dccp_poll(struct file *file, struct socket *sock,
270 poll_table *wait);
271 extern int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr,
272 int addr_len);
273
274 extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code);
275 extern void dccp_send_close(struct sock *sk, const int active);
276 extern int dccp_invalid_packet(struct sk_buff *skb);
277
278 static inline int dccp_bad_service_code(const struct sock *sk,
279 const __be32 service)
280 {
281 const struct dccp_sock *dp = dccp_sk(sk);
282
283 if (dp->dccps_service == service)
284 return 0;
285 return !dccp_list_has_service(dp->dccps_service_list, service);
286 }
287
288 struct dccp_skb_cb {
289 __u8 dccpd_type:4;
290 __u8 dccpd_ccval:4;
291 __u8 dccpd_reset_code;
292 __u16 dccpd_opt_len;
293 __u64 dccpd_seq;
294 __u64 dccpd_ack_seq;
295 };
296
297 #define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0]))
298
299 static inline int dccp_non_data_packet(const struct sk_buff *skb)
300 {
301 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
302
303 return type == DCCP_PKT_ACK ||
304 type == DCCP_PKT_CLOSE ||
305 type == DCCP_PKT_CLOSEREQ ||
306 type == DCCP_PKT_RESET ||
307 type == DCCP_PKT_SYNC ||
308 type == DCCP_PKT_SYNCACK;
309 }
310
311 static inline int dccp_packet_without_ack(const struct sk_buff *skb)
312 {
313 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
314
315 return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST;
316 }
317
318 #define DCCP_MAX_SEQNO ((((u64)1) << 48) - 1)
319 #define DCCP_PKT_WITHOUT_ACK_SEQ (DCCP_MAX_SEQNO << 2)
320
321 static inline void dccp_set_seqno(u64 *seqno, u64 value)
322 {
323 if (value > DCCP_MAX_SEQNO)
324 value -= DCCP_MAX_SEQNO + 1;
325 *seqno = value;
326 }
327
328 static inline u64 dccp_delta_seqno(u64 seqno1, u64 seqno2)
329 {
330 return ((seqno2 << 16) - (seqno1 << 16)) >> 16;
331 }
332
333 static inline void dccp_inc_seqno(u64 *seqno)
334 {
335 if (++*seqno > DCCP_MAX_SEQNO)
336 *seqno = 0;
337 }
338
339 static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss)
340 {
341 struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh +
342 sizeof(*dh));
343 dh->dccph_seq2 = 0;
344 dh->dccph_seq = htons((gss >> 32) & 0xfffff);
345 dhx->dccph_seq_low = htonl(gss & 0xffffffff);
346 }
347
348 static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack,
349 const u64 gsr)
350 {
351 dhack->dccph_reserved1 = 0;
352 dhack->dccph_ack_nr_high = htons(gsr >> 32);
353 dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff);
354 }
355
356 static inline void dccp_update_gsr(struct sock *sk, u64 seq)
357 {
358 struct dccp_sock *dp = dccp_sk(sk);
359 const struct dccp_minisock *dmsk = dccp_msk(sk);
360
361 dp->dccps_gsr = seq;
362 dccp_set_seqno(&dp->dccps_swl,
363 dp->dccps_gsr + 1 - (dmsk->dccpms_sequence_window / 4));
364 dccp_set_seqno(&dp->dccps_swh,
365 dp->dccps_gsr + (3 * dmsk->dccpms_sequence_window) / 4);
366 }
367
368 static inline void dccp_update_gss(struct sock *sk, u64 seq)
369 {
370 struct dccp_sock *dp = dccp_sk(sk);
371
372 dp->dccps_awh = dp->dccps_gss = seq;
373 dccp_set_seqno(&dp->dccps_awl,
374 (dp->dccps_gss -
375 dccp_msk(sk)->dccpms_sequence_window + 1));
376 }
377
378 static inline int dccp_ack_pending(const struct sock *sk)
379 {
380 const struct dccp_sock *dp = dccp_sk(sk);
381 return dp->dccps_timestamp_echo != 0 ||
382 #ifdef CONFIG_IP_DCCP_ACKVEC
383 (dccp_msk(sk)->dccpms_send_ack_vector &&
384 dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) ||
385 #endif
386 inet_csk_ack_scheduled(sk);
387 }
388
389 extern int dccp_insert_options(struct sock *sk, struct sk_buff *skb);
390 extern int dccp_insert_option_elapsed_time(struct sock *sk,
391 struct sk_buff *skb,
392 u32 elapsed_time);
393 extern int dccp_insert_option_timestamp(struct sock *sk,
394 struct sk_buff *skb);
395 extern int dccp_insert_option(struct sock *sk, struct sk_buff *skb,
396 unsigned char option,
397 const void *value, unsigned char len);
398
399 extern void dccp_timestamp(const struct sock *sk, struct timeval *tv);
400
401 static inline suseconds_t timeval_usecs(const struct timeval *tv)
402 {
403 return tv->tv_sec * USEC_PER_SEC + tv->tv_usec;
404 }
405
406 static inline suseconds_t timeval_delta(const struct timeval *large,
407 const struct timeval *small)
408 {
409 time_t secs = large->tv_sec - small->tv_sec;
410 suseconds_t usecs = large->tv_usec - small->tv_usec;
411
412 if (usecs < 0) {
413 secs--;
414 usecs += USEC_PER_SEC;
415 }
416 return secs * USEC_PER_SEC + usecs;
417 }
418
419 static inline void timeval_add_usecs(struct timeval *tv,
420 const suseconds_t usecs)
421 {
422 tv->tv_usec += usecs;
423 while (tv->tv_usec >= USEC_PER_SEC) {
424 tv->tv_sec++;
425 tv->tv_usec -= USEC_PER_SEC;
426 }
427 }
428
429 static inline void timeval_sub_usecs(struct timeval *tv,
430 const suseconds_t usecs)
431 {
432 tv->tv_usec -= usecs;
433 while (tv->tv_usec < 0) {
434 tv->tv_sec--;
435 tv->tv_usec += USEC_PER_SEC;
436 }
437 }
438
439 #ifdef CONFIG_SYSCTL
440 extern int dccp_sysctl_init(void);
441 extern void dccp_sysctl_exit(void);
442 #else
443 static inline int dccp_sysctl_init(void)
444 {
445 return 0;
446 }
447
448 static inline void dccp_sysctl_exit(void)
449 {
450 }
451 #endif
452
453 #endif /* _DCCP_H */
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