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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>
Ian McDonalde6bccd32006-08-26 19:01:30 -07008 * Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.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
15#include <linux/dccp.h>
16#include <net/snmp.h>
17#include <net/sock.h>
18#include <net/tcp.h>
Arnaldo Carvalho de Meloae31c332005-09-18 00:17:51 -070019#include "ackvec.h"
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070020
Arnaldo Carvalho de Melo725ba8e2005-08-13 20:35:39 -030021#ifdef CONFIG_IP_DCCP_DEBUG
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070022extern int dccp_debug;
23
24#define dccp_pr_debug(format, a...) \
25 do { if (dccp_debug) \
26 printk(KERN_DEBUG "%s: " format, __FUNCTION__ , ##a); \
27 } while (0)
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -030028#define dccp_pr_debug_cat(format, a...) do { if (dccp_debug) \
29 printk(format, ##a); } while (0)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070030#else
31#define dccp_pr_debug(format, a...)
32#define dccp_pr_debug_cat(format, a...)
33#endif
34
35extern struct inet_hashinfo dccp_hashinfo;
36
37extern atomic_t dccp_orphan_count;
38extern int dccp_tw_count;
39extern void dccp_tw_deschedule(struct inet_timewait_sock *tw);
40
41extern void dccp_time_wait(struct sock *sk, int state, int timeo);
42
43/* FIXME: Right size this */
44#define DCCP_MAX_OPT_LEN 128
45
46#define DCCP_MAX_PACKET_HDR 32
47
48#define MAX_DCCP_HEADER (DCCP_MAX_PACKET_HDR + DCCP_MAX_OPT_LEN + MAX_HEADER)
49
50#define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT
51 * state, about 60 seconds */
52
53/* draft-ietf-dccp-spec-11.txt initial RTO value */
54#define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ))
55
56/* Maximal interval between probes for local resources. */
57#define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U))
58
59#define DCCP_RTO_MAX ((unsigned)(120 * HZ)) /* FIXME: using TCP value */
60
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070061/* is seq1 < seq2 ? */
Patrick McHardya10cedd2005-08-14 21:05:53 -030062static inline int before48(const u64 seq1, const u64 seq2)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070063{
Patrick McHardya10cedd2005-08-14 21:05:53 -030064 return (s64)((seq1 << 16) - (seq2 << 16)) < 0;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070065}
66
67/* is seq1 > seq2 ? */
Patrick McHardya10cedd2005-08-14 21:05:53 -030068static inline int after48(const u64 seq1, const u64 seq2)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070069{
Patrick McHardya10cedd2005-08-14 21:05:53 -030070 return (s64)((seq2 << 16) - (seq1 << 16)) < 0;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070071}
72
73/* is seq2 <= seq1 <= seq3 ? */
Patrick McHardya10cedd2005-08-14 21:05:53 -030074static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070075{
76 return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16);
77}
78
79static inline u64 max48(const u64 seq1, const u64 seq2)
80{
81 return after48(seq1, seq2) ? seq1 : seq2;
82}
83
84enum {
85 DCCP_MIB_NUM = 0,
86 DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */
87 DCCP_MIB_ESTABRESETS, /* EstabResets */
88 DCCP_MIB_CURRESTAB, /* CurrEstab */
89 DCCP_MIB_OUTSEGS, /* OutSegs */
90 DCCP_MIB_OUTRSTS,
91 DCCP_MIB_ABORTONTIMEOUT,
92 DCCP_MIB_TIMEOUTS,
93 DCCP_MIB_ABORTFAILED,
94 DCCP_MIB_PASSIVEOPENS,
95 DCCP_MIB_ATTEMPTFAILS,
96 DCCP_MIB_OUTDATAGRAMS,
97 DCCP_MIB_INERRS,
98 DCCP_MIB_OPTMANDATORYERROR,
99 DCCP_MIB_INVALIDOPT,
100 __DCCP_MIB_MAX
101};
102
103#define DCCP_MIB_MAX __DCCP_MIB_MAX
104struct dccp_mib {
105 unsigned long mibs[DCCP_MIB_MAX];
106} __SNMP_MIB_ALIGN__;
107
108DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics);
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300109#define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field)
110#define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field)
111#define DCCP_INC_STATS_USER(field) SNMP_INC_STATS_USER(dccp_statistics, field)
112#define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field)
113#define DCCP_ADD_STATS_BH(field, val) \
114 SNMP_ADD_STATS_BH(dccp_statistics, field, val)
115#define DCCP_ADD_STATS_USER(field, val) \
116 SNMP_ADD_STATS_USER(dccp_statistics, field, val)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700117
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700118extern int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb);
119
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700120extern void dccp_send_ack(struct sock *sk);
121extern void dccp_send_delayed_ack(struct sock *sk);
Arnaldo Carvalho de Meloe92ae932005-08-17 03:10:59 -0300122extern void dccp_send_sync(struct sock *sk, const u64 seq,
123 const enum dccp_pkt_type pkt_type);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700124
Arnaldo Carvalho de Melod6809c12005-08-27 03:06:35 -0300125extern int dccp_write_xmit(struct sock *sk, struct sk_buff *skb, long *timeo);
Arnaldo Carvalho de Meloc530cfb2005-08-29 02:15:54 -0300126extern void dccp_write_space(struct sock *sk);
Arnaldo Carvalho de Melo27258ee2005-08-09 20:30:56 -0700127
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700128extern void dccp_init_xmit_timers(struct sock *sk);
129static inline void dccp_clear_xmit_timers(struct sock *sk)
130{
131 inet_csk_clear_xmit_timers(sk);
132}
133
134extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu);
135
136extern const char *dccp_packet_name(const int type);
137extern const char *dccp_state_name(const int state);
138
Arnaldo Carvalho de Meloc25a18b2006-03-20 21:58:56 -0800139extern void dccp_set_state(struct sock *sk, const int state);
140extern void dccp_done(struct sock *sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700141
142static inline void dccp_openreq_init(struct request_sock *req,
143 struct dccp_sock *dp,
144 struct sk_buff *skb)
145{
146 /*
147 * FIXME: fill in the other req fields from the DCCP options
148 * received
149 */
150 inet_rsk(req)->rmt_port = dccp_hdr(skb)->dccph_sport;
151 inet_rsk(req)->acked = 0;
152 req->rcv_wnd = 0;
153}
154
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700155extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb);
156
157extern struct sock *dccp_create_openreq_child(struct sock *sk,
158 const struct request_sock *req,
159 const struct sk_buff *skb);
160
161extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb);
162
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700163extern struct sock *dccp_v4_request_recv_sock(struct sock *sk,
164 struct sk_buff *skb,
165 struct request_sock *req,
166 struct dst_entry *dst);
167extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb,
168 struct request_sock *req,
169 struct request_sock **prev);
170
171extern int dccp_child_process(struct sock *parent, struct sock *child,
172 struct sk_buff *skb);
173extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
174 struct dccp_hdr *dh, unsigned len);
175extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
176 const struct dccp_hdr *dh, const unsigned len);
177
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -0800178extern int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized);
Arnaldo Carvalho de Melo3e0fadc2006-03-20 21:23:15 -0800179extern int dccp_destroy_sock(struct sock *sk);
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800180
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700181extern void dccp_close(struct sock *sk, long timeout);
182extern struct sk_buff *dccp_make_response(struct sock *sk,
183 struct dst_entry *dst,
184 struct request_sock *req);
185
186extern int dccp_connect(struct sock *sk);
187extern int dccp_disconnect(struct sock *sk, int flags);
Arnaldo Carvalho de Meloc985ed72006-03-20 21:23:39 -0800188extern void dccp_hash(struct sock *sk);
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800189extern void dccp_unhash(struct sock *sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700190extern int dccp_getsockopt(struct sock *sk, int level, int optname,
Arnaldo Carvalho de Meloa1d3a352005-08-13 22:42:25 -0300191 char __user *optval, int __user *optlen);
192extern int dccp_setsockopt(struct sock *sk, int level, int optname,
193 char __user *optval, int optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800194#ifdef CONFIG_COMPAT
195extern int compat_dccp_getsockopt(struct sock *sk,
196 int level, int optname,
197 char __user *optval, int __user *optlen);
198extern int compat_dccp_setsockopt(struct sock *sk,
199 int level, int optname,
200 char __user *optval, int optlen);
201#endif
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700202extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg);
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300203extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk,
204 struct msghdr *msg, size_t size);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700205extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk,
206 struct msghdr *msg, size_t len, int nonblock,
207 int flags, int *addr_len);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700208extern void dccp_shutdown(struct sock *sk, int how);
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800209extern int inet_dccp_listen(struct socket *sock, int backlog);
210extern unsigned int dccp_poll(struct file *file, struct socket *sock,
211 poll_table *wait);
212extern void dccp_v4_send_check(struct sock *sk, int len,
213 struct sk_buff *skb);
214extern int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr,
215 int addr_len);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700216
Yoshifumi Nishida95b81ef2005-08-09 20:15:35 -0700217extern int dccp_v4_checksum(const struct sk_buff *skb,
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800218 const __be32 saddr, const __be32 daddr);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700219
Arnaldo Carvalho de Melo017487d2006-03-20 19:25:24 -0800220extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code);
Arnaldo Carvalho de Melo7ad07e72005-08-23 21:50:06 -0700221extern void dccp_send_close(struct sock *sk, const int active);
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800222extern int dccp_invalid_packet(struct sk_buff *skb);
223
224static inline int dccp_bad_service_code(const struct sock *sk,
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800225 const __be32 service)
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800226{
227 const struct dccp_sock *dp = dccp_sk(sk);
228
229 if (dp->dccps_service == service)
230 return 0;
231 return !dccp_list_has_service(dp->dccps_service_list, service);
232}
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700233
234struct dccp_skb_cb {
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700235 __u8 dccpd_type:4;
236 __u8 dccpd_ccval:4;
237 __u8 dccpd_reset_code;
238 __u16 dccpd_opt_len;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700239 __u64 dccpd_seq;
240 __u64 dccpd_ack_seq;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700241};
242
243#define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0]))
244
245static inline int dccp_non_data_packet(const struct sk_buff *skb)
246{
247 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
248
249 return type == DCCP_PKT_ACK ||
250 type == DCCP_PKT_CLOSE ||
251 type == DCCP_PKT_CLOSEREQ ||
252 type == DCCP_PKT_RESET ||
253 type == DCCP_PKT_SYNC ||
254 type == DCCP_PKT_SYNCACK;
255}
256
257static inline int dccp_packet_without_ack(const struct sk_buff *skb)
258{
259 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
260
261 return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST;
262}
263
264#define DCCP_MAX_SEQNO ((((u64)1) << 48) - 1)
265#define DCCP_PKT_WITHOUT_ACK_SEQ (DCCP_MAX_SEQNO << 2)
266
267static inline void dccp_set_seqno(u64 *seqno, u64 value)
268{
269 if (value > DCCP_MAX_SEQNO)
270 value -= DCCP_MAX_SEQNO + 1;
271 *seqno = value;
272}
273
274static inline u64 dccp_delta_seqno(u64 seqno1, u64 seqno2)
275{
276 return ((seqno2 << 16) - (seqno1 << 16)) >> 16;
277}
278
279static inline void dccp_inc_seqno(u64 *seqno)
280{
281 if (++*seqno > DCCP_MAX_SEQNO)
282 *seqno = 0;
283}
284
285static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss)
286{
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300287 struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh +
288 sizeof(*dh));
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800289 dh->dccph_seq2 = 0;
290 dh->dccph_seq = htons((gss >> 32) & 0xfffff);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700291 dhx->dccph_seq_low = htonl(gss & 0xffffffff);
292}
293
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300294static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack,
295 const u64 gsr)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700296{
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800297 dhack->dccph_reserved1 = 0;
298 dhack->dccph_ack_nr_high = htons(gsr >> 32);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700299 dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff);
300}
301
302static inline void dccp_update_gsr(struct sock *sk, u64 seq)
303{
304 struct dccp_sock *dp = dccp_sk(sk);
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800305 const struct dccp_minisock *dmsk = dccp_msk(sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700306
Arnaldo Carvalho de Melo03ace392005-08-21 05:36:45 -0300307 dp->dccps_gsr = seq;
308 dccp_set_seqno(&dp->dccps_swl,
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800309 dp->dccps_gsr + 1 - (dmsk->dccpms_sequence_window / 4));
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700310 dccp_set_seqno(&dp->dccps_swh,
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800311 dp->dccps_gsr + (3 * dmsk->dccpms_sequence_window) / 4);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700312}
313
314static inline void dccp_update_gss(struct sock *sk, u64 seq)
315{
316 struct dccp_sock *dp = dccp_sk(sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700317
Arnaldo Carvalho de Melo03ace392005-08-21 05:36:45 -0300318 dp->dccps_awh = dp->dccps_gss = seq;
319 dccp_set_seqno(&dp->dccps_awl,
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300320 (dp->dccps_gss -
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800321 dccp_msk(sk)->dccpms_sequence_window + 1));
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700322}
Arnaldo Carvalho de Meloae31c332005-09-18 00:17:51 -0700323
324static inline int dccp_ack_pending(const struct sock *sk)
325{
326 const struct dccp_sock *dp = dccp_sk(sk);
327 return dp->dccps_timestamp_echo != 0 ||
328#ifdef CONFIG_IP_DCCP_ACKVEC
Arnaldo Carvalho de Meloa4bf3902006-03-20 22:50:58 -0800329 (dccp_msk(sk)->dccpms_send_ack_vector &&
Arnaldo Carvalho de Meloae31c332005-09-18 00:17:51 -0700330 dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) ||
331#endif
332 inet_csk_ack_scheduled(sk);
333}
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700334
Arnaldo Carvalho de Melo2d0817d2006-03-20 22:32:06 -0800335extern int dccp_insert_options(struct sock *sk, struct sk_buff *skb);
336extern int dccp_insert_option_elapsed_time(struct sock *sk,
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700337 struct sk_buff *skb,
338 u32 elapsed_time);
Arnaldo Carvalho de Melo2d0817d2006-03-20 22:32:06 -0800339extern int dccp_insert_option_timestamp(struct sock *sk,
Arnaldo Carvalho de Melod4b81ff2005-08-23 21:51:36 -0700340 struct sk_buff *skb);
Arnaldo Carvalho de Melo2d0817d2006-03-20 22:32:06 -0800341extern int dccp_insert_option(struct sock *sk, struct sk_buff *skb,
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700342 unsigned char option,
343 const void *value, unsigned char len);
344
Arnaldo Carvalho de Melob0e56782005-09-09 02:38:35 -0300345extern void dccp_timestamp(const struct sock *sk, struct timeval *tv);
346
Arnaldo Carvalho de Melob6ee3d42005-08-27 18:18:18 -0300347static inline suseconds_t timeval_usecs(const struct timeval *tv)
348{
349 return tv->tv_sec * USEC_PER_SEC + tv->tv_usec;
350}
351
352static inline suseconds_t timeval_delta(const struct timeval *large,
353 const struct timeval *small)
354{
355 time_t secs = large->tv_sec - small->tv_sec;
356 suseconds_t usecs = large->tv_usec - small->tv_usec;
357
358 if (usecs < 0) {
359 secs--;
360 usecs += USEC_PER_SEC;
361 }
362 return secs * USEC_PER_SEC + usecs;
363}
364
365static inline void timeval_add_usecs(struct timeval *tv,
366 const suseconds_t usecs)
367{
368 tv->tv_usec += usecs;
369 while (tv->tv_usec >= USEC_PER_SEC) {
370 tv->tv_sec++;
371 tv->tv_usec -= USEC_PER_SEC;
372 }
373}
374
375static inline void timeval_sub_usecs(struct timeval *tv,
376 const suseconds_t usecs)
377{
378 tv->tv_usec -= usecs;
379 while (tv->tv_usec < 0) {
380 tv->tv_sec--;
381 tv->tv_usec += USEC_PER_SEC;
382 }
383}
384
Arnaldo Carvalho de Meloe55d9122006-03-20 19:25:02 -0800385#ifdef CONFIG_SYSCTL
386extern int dccp_sysctl_init(void);
387extern void dccp_sysctl_exit(void);
388#else
389static inline int dccp_sysctl_init(void)
390{
391 return 0;
392}
393
394static inline void dccp_sysctl_exit(void)
395{
396}
397#endif
398
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700399#endif /* _DCCP_H */