blob: 1fe509148689d4d0ddd063e94683e3d32c8dfe9f [file] [log] [blame]
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001#ifndef _DCCP_H
2#define _DCCP_H
3/*
4 * net/dccp/dccp.h
5 *
6 * An implementation of the DCCP protocol
Ian McDonald1bc09862005-08-20 00:23:43 -03007 * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
8 * Copyright (c) 2005 Ian McDonald <iam4@cs.waikato.ac.nz>
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07009 *
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
Arnaldo Carvalho de Melo725ba8e2005-08-13 20:35:39 -030015#include <linux/config.h>
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070016#include <linux/dccp.h>
17#include <net/snmp.h>
18#include <net/sock.h>
19#include <net/tcp.h>
Arnaldo Carvalho de Meloae31c332005-09-18 00:17:51 -070020#include "ackvec.h"
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070021
Arnaldo Carvalho de Melo725ba8e2005-08-13 20:35:39 -030022#ifdef CONFIG_IP_DCCP_DEBUG
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070023extern 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)
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -030029#define dccp_pr_debug_cat(format, a...) do { if (dccp_debug) \
30 printk(format, ##a); } while (0)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070031#else
32#define dccp_pr_debug(format, a...)
33#define dccp_pr_debug_cat(format, a...)
34#endif
35
36extern struct inet_hashinfo dccp_hashinfo;
37
38extern atomic_t dccp_orphan_count;
39extern int dccp_tw_count;
40extern void dccp_tw_deschedule(struct inet_timewait_sock *tw);
41
42extern 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
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070062/* is seq1 < seq2 ? */
Patrick McHardya10cedd2005-08-14 21:05:53 -030063static inline int before48(const u64 seq1, const u64 seq2)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070064{
Patrick McHardya10cedd2005-08-14 21:05:53 -030065 return (s64)((seq1 << 16) - (seq2 << 16)) < 0;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070066}
67
68/* is seq1 > seq2 ? */
Patrick McHardya10cedd2005-08-14 21:05:53 -030069static inline int after48(const u64 seq1, const u64 seq2)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070070{
Patrick McHardya10cedd2005-08-14 21:05:53 -030071 return (s64)((seq2 << 16) - (seq1 << 16)) < 0;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070072}
73
74/* is seq2 <= seq1 <= seq3 ? */
Patrick McHardya10cedd2005-08-14 21:05:53 -030075static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070076{
77 return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16);
78}
79
80static inline u64 max48(const u64 seq1, const u64 seq2)
81{
82 return after48(seq1, seq2) ? seq1 : seq2;
83}
84
85enum {
86 DCCP_MIB_NUM = 0,
87 DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */
88 DCCP_MIB_ESTABRESETS, /* EstabResets */
89 DCCP_MIB_CURRESTAB, /* CurrEstab */
90 DCCP_MIB_OUTSEGS, /* OutSegs */
91 DCCP_MIB_OUTRSTS,
92 DCCP_MIB_ABORTONTIMEOUT,
93 DCCP_MIB_TIMEOUTS,
94 DCCP_MIB_ABORTFAILED,
95 DCCP_MIB_PASSIVEOPENS,
96 DCCP_MIB_ATTEMPTFAILS,
97 DCCP_MIB_OUTDATAGRAMS,
98 DCCP_MIB_INERRS,
99 DCCP_MIB_OPTMANDATORYERROR,
100 DCCP_MIB_INVALIDOPT,
101 __DCCP_MIB_MAX
102};
103
104#define DCCP_MIB_MAX __DCCP_MIB_MAX
105struct dccp_mib {
106 unsigned long mibs[DCCP_MIB_MAX];
107} __SNMP_MIB_ALIGN__;
108
109DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics);
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300110#define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field)
111#define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field)
112#define DCCP_INC_STATS_USER(field) SNMP_INC_STATS_USER(dccp_statistics, field)
113#define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field)
114#define DCCP_ADD_STATS_BH(field, val) \
115 SNMP_ADD_STATS_BH(dccp_statistics, field, val)
116#define DCCP_ADD_STATS_USER(field, val) \
117 SNMP_ADD_STATS_USER(dccp_statistics, field, val)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700118
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700119extern int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb);
120
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700121extern void dccp_send_ack(struct sock *sk);
122extern void dccp_send_delayed_ack(struct sock *sk);
Arnaldo Carvalho de Meloe92ae932005-08-17 03:10:59 -0300123extern void dccp_send_sync(struct sock *sk, const u64 seq,
124 const enum dccp_pkt_type pkt_type);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700125
Arnaldo Carvalho de Melod6809c12005-08-27 03:06:35 -0300126extern int dccp_write_xmit(struct sock *sk, struct sk_buff *skb, long *timeo);
Arnaldo Carvalho de Meloc530cfb2005-08-29 02:15:54 -0300127extern void dccp_write_space(struct sock *sk);
Arnaldo Carvalho de Melo27258ee2005-08-09 20:30:56 -0700128
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700129extern void dccp_init_xmit_timers(struct sock *sk);
130static inline void dccp_clear_xmit_timers(struct sock *sk)
131{
132 inet_csk_clear_xmit_timers(sk);
133}
134
135extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu);
136
137extern const char *dccp_packet_name(const int type);
138extern const char *dccp_state_name(const int state);
139
Arnaldo Carvalho de Meloc25a18b2006-03-20 21:58:56 -0800140extern void dccp_set_state(struct sock *sk, const int state);
141extern void dccp_done(struct sock *sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700142
143static inline void dccp_openreq_init(struct request_sock *req,
144 struct dccp_sock *dp,
145 struct sk_buff *skb)
146{
147 /*
148 * FIXME: fill in the other req fields from the DCCP options
149 * received
150 */
151 inet_rsk(req)->rmt_port = dccp_hdr(skb)->dccph_sport;
152 inet_rsk(req)->acked = 0;
153 req->rcv_wnd = 0;
154}
155
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700156extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb);
157
158extern struct sock *dccp_create_openreq_child(struct sock *sk,
159 const struct request_sock *req,
160 const struct sk_buff *skb);
161
162extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb);
163
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700164extern struct sock *dccp_v4_request_recv_sock(struct sock *sk,
165 struct sk_buff *skb,
166 struct request_sock *req,
167 struct dst_entry *dst);
168extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb,
169 struct request_sock *req,
170 struct request_sock **prev);
171
172extern int dccp_child_process(struct sock *parent, struct sock *child,
173 struct sk_buff *skb);
174extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
175 struct dccp_hdr *dh, unsigned len);
176extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
177 const struct dccp_hdr *dh, const unsigned len);
178
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -0800179extern int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized);
Arnaldo Carvalho de Melo3e0fadc2006-03-20 21:23:15 -0800180extern int dccp_destroy_sock(struct sock *sk);
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800181
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700182extern void dccp_close(struct sock *sk, long timeout);
183extern struct sk_buff *dccp_make_response(struct sock *sk,
184 struct dst_entry *dst,
185 struct request_sock *req);
186
187extern int dccp_connect(struct sock *sk);
188extern int dccp_disconnect(struct sock *sk, int flags);
Arnaldo Carvalho de Meloc985ed72006-03-20 21:23:39 -0800189extern void dccp_hash(struct sock *sk);
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800190extern void dccp_unhash(struct sock *sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700191extern int dccp_getsockopt(struct sock *sk, int level, int optname,
Arnaldo Carvalho de Meloa1d3a352005-08-13 22:42:25 -0300192 char __user *optval, int __user *optlen);
193extern int dccp_setsockopt(struct sock *sk, int level, int optname,
194 char __user *optval, int optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800195#ifdef CONFIG_COMPAT
196extern int compat_dccp_getsockopt(struct sock *sk,
197 int level, int optname,
198 char __user *optval, int __user *optlen);
199extern int compat_dccp_setsockopt(struct sock *sk,
200 int level, int optname,
201 char __user *optval, int optlen);
202#endif
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700203extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg);
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300204extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk,
205 struct msghdr *msg, size_t size);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700206extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk,
207 struct msghdr *msg, size_t len, int nonblock,
208 int flags, int *addr_len);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700209extern void dccp_shutdown(struct sock *sk, int how);
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800210extern int inet_dccp_listen(struct socket *sock, int backlog);
211extern unsigned int dccp_poll(struct file *file, struct socket *sock,
212 poll_table *wait);
213extern void dccp_v4_send_check(struct sock *sk, int len,
214 struct sk_buff *skb);
215extern int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr,
216 int addr_len);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700217
Yoshifumi Nishida95b81ef2005-08-09 20:15:35 -0700218extern int dccp_v4_checksum(const struct sk_buff *skb,
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800219 const __be32 saddr, const __be32 daddr);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700220
Arnaldo Carvalho de Melo017487d2006-03-20 19:25:24 -0800221extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code);
Arnaldo Carvalho de Melo7ad07e72005-08-23 21:50:06 -0700222extern void dccp_send_close(struct sock *sk, const int active);
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800223extern int dccp_invalid_packet(struct sk_buff *skb);
224
225static inline int dccp_bad_service_code(const struct sock *sk,
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800226 const __be32 service)
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800227{
228 const struct dccp_sock *dp = dccp_sk(sk);
229
230 if (dp->dccps_service == service)
231 return 0;
232 return !dccp_list_has_service(dp->dccps_service_list, service);
233}
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700234
235struct dccp_skb_cb {
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700236 __u8 dccpd_type:4;
237 __u8 dccpd_ccval:4;
238 __u8 dccpd_reset_code;
239 __u16 dccpd_opt_len;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700240 __u64 dccpd_seq;
241 __u64 dccpd_ack_seq;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700242};
243
244#define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0]))
245
246static inline int dccp_non_data_packet(const struct sk_buff *skb)
247{
248 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
249
250 return type == DCCP_PKT_ACK ||
251 type == DCCP_PKT_CLOSE ||
252 type == DCCP_PKT_CLOSEREQ ||
253 type == DCCP_PKT_RESET ||
254 type == DCCP_PKT_SYNC ||
255 type == DCCP_PKT_SYNCACK;
256}
257
258static inline int dccp_packet_without_ack(const struct sk_buff *skb)
259{
260 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
261
262 return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST;
263}
264
265#define DCCP_MAX_SEQNO ((((u64)1) << 48) - 1)
266#define DCCP_PKT_WITHOUT_ACK_SEQ (DCCP_MAX_SEQNO << 2)
267
268static inline void dccp_set_seqno(u64 *seqno, u64 value)
269{
270 if (value > DCCP_MAX_SEQNO)
271 value -= DCCP_MAX_SEQNO + 1;
272 *seqno = value;
273}
274
275static inline u64 dccp_delta_seqno(u64 seqno1, u64 seqno2)
276{
277 return ((seqno2 << 16) - (seqno1 << 16)) >> 16;
278}
279
280static inline void dccp_inc_seqno(u64 *seqno)
281{
282 if (++*seqno > DCCP_MAX_SEQNO)
283 *seqno = 0;
284}
285
286static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss)
287{
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300288 struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh +
289 sizeof(*dh));
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800290 dh->dccph_seq2 = 0;
291 dh->dccph_seq = htons((gss >> 32) & 0xfffff);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700292 dhx->dccph_seq_low = htonl(gss & 0xffffffff);
293}
294
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300295static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack,
296 const u64 gsr)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700297{
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800298 dhack->dccph_reserved1 = 0;
299 dhack->dccph_ack_nr_high = htons(gsr >> 32);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700300 dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff);
301}
302
303static inline void dccp_update_gsr(struct sock *sk, u64 seq)
304{
305 struct dccp_sock *dp = dccp_sk(sk);
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800306 const struct dccp_minisock *dmsk = dccp_msk(sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700307
Arnaldo Carvalho de Melo03ace392005-08-21 05:36:45 -0300308 dp->dccps_gsr = seq;
309 dccp_set_seqno(&dp->dccps_swl,
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800310 dp->dccps_gsr + 1 - (dmsk->dccpms_sequence_window / 4));
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700311 dccp_set_seqno(&dp->dccps_swh,
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800312 dp->dccps_gsr + (3 * dmsk->dccpms_sequence_window) / 4);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700313}
314
315static inline void dccp_update_gss(struct sock *sk, u64 seq)
316{
317 struct dccp_sock *dp = dccp_sk(sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700318
Arnaldo Carvalho de Melo03ace392005-08-21 05:36:45 -0300319 dp->dccps_awh = dp->dccps_gss = seq;
320 dccp_set_seqno(&dp->dccps_awl,
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300321 (dp->dccps_gss -
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800322 dccp_msk(sk)->dccpms_sequence_window + 1));
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700323}
Arnaldo Carvalho de Meloae31c332005-09-18 00:17:51 -0700324
325static inline int dccp_ack_pending(const struct sock *sk)
326{
327 const struct dccp_sock *dp = dccp_sk(sk);
328 return dp->dccps_timestamp_echo != 0 ||
329#ifdef CONFIG_IP_DCCP_ACKVEC
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800330 (dccp_msk(sk)->dccpms_send_ack_vector &&
Arnaldo Carvalho de Meloae31c332005-09-18 00:17:51 -0700331 dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) ||
332#endif
333 inet_csk_ack_scheduled(sk);
334}
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700335
Arnaldo Carvalho de Melo2d0817d2006-03-20 22:32:06 -0800336extern int dccp_insert_options(struct sock *sk, struct sk_buff *skb);
337extern int dccp_insert_option_elapsed_time(struct sock *sk,
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700338 struct sk_buff *skb,
339 u32 elapsed_time);
Arnaldo Carvalho de Melo2d0817d2006-03-20 22:32:06 -0800340extern int dccp_insert_option_timestamp(struct sock *sk,
Arnaldo Carvalho de Melod4b81ff2005-08-23 21:51:36 -0700341 struct sk_buff *skb);
Arnaldo Carvalho de Melo2d0817d2006-03-20 22:32:06 -0800342extern int dccp_insert_option(struct sock *sk, struct sk_buff *skb,
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700343 unsigned char option,
344 const void *value, unsigned char len);
345
Arnaldo Carvalho de Melob0e56782005-09-09 02:38:35 -0300346extern void dccp_timestamp(const struct sock *sk, struct timeval *tv);
347
Arnaldo Carvalho de Melob6ee3d42005-08-27 18:18:18 -0300348static inline suseconds_t timeval_usecs(const struct timeval *tv)
349{
350 return tv->tv_sec * USEC_PER_SEC + tv->tv_usec;
351}
352
353static inline suseconds_t timeval_delta(const struct timeval *large,
354 const struct timeval *small)
355{
356 time_t secs = large->tv_sec - small->tv_sec;
357 suseconds_t usecs = large->tv_usec - small->tv_usec;
358
359 if (usecs < 0) {
360 secs--;
361 usecs += USEC_PER_SEC;
362 }
363 return secs * USEC_PER_SEC + usecs;
364}
365
366static inline void timeval_add_usecs(struct timeval *tv,
367 const suseconds_t usecs)
368{
369 tv->tv_usec += usecs;
370 while (tv->tv_usec >= USEC_PER_SEC) {
371 tv->tv_sec++;
372 tv->tv_usec -= USEC_PER_SEC;
373 }
374}
375
376static inline void timeval_sub_usecs(struct timeval *tv,
377 const suseconds_t usecs)
378{
379 tv->tv_usec -= usecs;
380 while (tv->tv_usec < 0) {
381 tv->tv_sec--;
382 tv->tv_usec += USEC_PER_SEC;
383 }
384}
385
Arnaldo Carvalho de Meloe55d9122006-03-20 19:25:02 -0800386#ifdef CONFIG_SYSCTL
387extern int dccp_sysctl_init(void);
388extern void dccp_sysctl_exit(void);
389#else
390static inline int dccp_sysctl_init(void)
391{
392 return 0;
393}
394
395static inline void dccp_sysctl_exit(void)
396{
397}
398#endif
399
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700400#endif /* _DCCP_H */