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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>
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
121extern int dccp_send_response(struct sock *sk);
122extern void dccp_send_ack(struct sock *sk);
123extern void dccp_send_delayed_ack(struct sock *sk);
Arnaldo Carvalho de Meloe92ae932005-08-17 03:10:59 -0300124extern void dccp_send_sync(struct sock *sk, const u64 seq,
125 const enum dccp_pkt_type pkt_type);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700126
Arnaldo Carvalho de Melod6809c12005-08-27 03:06:35 -0300127extern int dccp_write_xmit(struct sock *sk, struct sk_buff *skb, long *timeo);
Arnaldo Carvalho de Meloc530cfb2005-08-29 02:15:54 -0300128extern void dccp_write_space(struct sock *sk);
Arnaldo Carvalho de Melo27258ee2005-08-09 20:30:56 -0700129
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700130extern void dccp_init_xmit_timers(struct sock *sk);
131static inline void dccp_clear_xmit_timers(struct sock *sk)
132{
133 inet_csk_clear_xmit_timers(sk);
134}
135
136extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu);
137
138extern const char *dccp_packet_name(const int type);
139extern const char *dccp_state_name(const int state);
140
Arnaldo Carvalho de Meloc25a18b2006-03-20 21:58:56 -0800141extern void dccp_set_state(struct sock *sk, const int state);
142extern void dccp_done(struct sock *sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700143
144static inline void dccp_openreq_init(struct request_sock *req,
145 struct dccp_sock *dp,
146 struct sk_buff *skb)
147{
148 /*
149 * FIXME: fill in the other req fields from the DCCP options
150 * received
151 */
152 inet_rsk(req)->rmt_port = dccp_hdr(skb)->dccph_sport;
153 inet_rsk(req)->acked = 0;
154 req->rcv_wnd = 0;
155}
156
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700157extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb);
158
159extern struct sock *dccp_create_openreq_child(struct sock *sk,
160 const struct request_sock *req,
161 const struct sk_buff *skb);
162
163extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb);
164
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700165extern struct sock *dccp_v4_request_recv_sock(struct sock *sk,
166 struct sk_buff *skb,
167 struct request_sock *req,
168 struct dst_entry *dst);
169extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb,
170 struct request_sock *req,
171 struct request_sock **prev);
172
173extern int dccp_child_process(struct sock *parent, struct sock *child,
174 struct sk_buff *skb);
175extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
176 struct dccp_hdr *dh, unsigned len);
177extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
178 const struct dccp_hdr *dh, const unsigned len);
179
Arnaldo Carvalho de Melo3e0fadc2006-03-20 21:23:15 -0800180extern int dccp_init_sock(struct sock *sk);
181extern int dccp_destroy_sock(struct sock *sk);
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800182
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700183extern void dccp_close(struct sock *sk, long timeout);
184extern struct sk_buff *dccp_make_response(struct sock *sk,
185 struct dst_entry *dst,
186 struct request_sock *req);
187
188extern int dccp_connect(struct sock *sk);
189extern int dccp_disconnect(struct sock *sk, int flags);
Arnaldo Carvalho de Meloc985ed72006-03-20 21:23:39 -0800190extern void dccp_hash(struct sock *sk);
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800191extern void dccp_unhash(struct sock *sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700192extern int dccp_getsockopt(struct sock *sk, int level, int optname,
Arnaldo Carvalho de Meloa1d3a352005-08-13 22:42:25 -0300193 char __user *optval, int __user *optlen);
194extern int dccp_setsockopt(struct sock *sk, int level, int optname,
195 char __user *optval, int optlen);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700196extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg);
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300197extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk,
198 struct msghdr *msg, size_t size);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700199extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk,
200 struct msghdr *msg, size_t len, int nonblock,
201 int flags, int *addr_len);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700202extern void dccp_shutdown(struct sock *sk, int how);
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800203extern int inet_dccp_listen(struct socket *sock, int backlog);
204extern unsigned int dccp_poll(struct file *file, struct socket *sock,
205 poll_table *wait);
206extern void dccp_v4_send_check(struct sock *sk, int len,
207 struct sk_buff *skb);
208extern int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr,
209 int addr_len);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700210
Yoshifumi Nishida95b81ef2005-08-09 20:15:35 -0700211extern int dccp_v4_checksum(const struct sk_buff *skb,
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800212 const __be32 saddr, const __be32 daddr);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700213
Arnaldo Carvalho de Melo017487d2006-03-20 19:25:24 -0800214extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code);
Arnaldo Carvalho de Melo7ad07e72005-08-23 21:50:06 -0700215extern void dccp_send_close(struct sock *sk, const int active);
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800216extern int dccp_invalid_packet(struct sk_buff *skb);
217
218static inline int dccp_bad_service_code(const struct sock *sk,
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800219 const __be32 service)
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800220{
221 const struct dccp_sock *dp = dccp_sk(sk);
222
223 if (dp->dccps_service == service)
224 return 0;
225 return !dccp_list_has_service(dp->dccps_service_list, service);
226}
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700227
228struct dccp_skb_cb {
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700229 __u8 dccpd_type:4;
230 __u8 dccpd_ccval:4;
231 __u8 dccpd_reset_code;
232 __u16 dccpd_opt_len;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700233 __u64 dccpd_seq;
234 __u64 dccpd_ack_seq;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700235};
236
237#define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0]))
238
239static inline int dccp_non_data_packet(const struct sk_buff *skb)
240{
241 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
242
243 return type == DCCP_PKT_ACK ||
244 type == DCCP_PKT_CLOSE ||
245 type == DCCP_PKT_CLOSEREQ ||
246 type == DCCP_PKT_RESET ||
247 type == DCCP_PKT_SYNC ||
248 type == DCCP_PKT_SYNCACK;
249}
250
251static inline int dccp_packet_without_ack(const struct sk_buff *skb)
252{
253 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
254
255 return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST;
256}
257
258#define DCCP_MAX_SEQNO ((((u64)1) << 48) - 1)
259#define DCCP_PKT_WITHOUT_ACK_SEQ (DCCP_MAX_SEQNO << 2)
260
261static inline void dccp_set_seqno(u64 *seqno, u64 value)
262{
263 if (value > DCCP_MAX_SEQNO)
264 value -= DCCP_MAX_SEQNO + 1;
265 *seqno = value;
266}
267
268static inline u64 dccp_delta_seqno(u64 seqno1, u64 seqno2)
269{
270 return ((seqno2 << 16) - (seqno1 << 16)) >> 16;
271}
272
273static inline void dccp_inc_seqno(u64 *seqno)
274{
275 if (++*seqno > DCCP_MAX_SEQNO)
276 *seqno = 0;
277}
278
279static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss)
280{
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300281 struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh +
282 sizeof(*dh));
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800283 dh->dccph_seq2 = 0;
284 dh->dccph_seq = htons((gss >> 32) & 0xfffff);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700285 dhx->dccph_seq_low = htonl(gss & 0xffffffff);
286}
287
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300288static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack,
289 const u64 gsr)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700290{
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800291 dhack->dccph_reserved1 = 0;
292 dhack->dccph_ack_nr_high = htons(gsr >> 32);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700293 dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff);
294}
295
296static inline void dccp_update_gsr(struct sock *sk, u64 seq)
297{
298 struct dccp_sock *dp = dccp_sk(sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700299
Arnaldo Carvalho de Melo03ace392005-08-21 05:36:45 -0300300 dp->dccps_gsr = seq;
301 dccp_set_seqno(&dp->dccps_swl,
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300302 (dp->dccps_gsr + 1 -
303 (dp->dccps_options.dccpo_sequence_window / 4)));
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700304 dccp_set_seqno(&dp->dccps_swh,
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300305 (dp->dccps_gsr +
306 (3 * dp->dccps_options.dccpo_sequence_window) / 4));
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700307}
308
309static inline void dccp_update_gss(struct sock *sk, u64 seq)
310{
311 struct dccp_sock *dp = dccp_sk(sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700312
Arnaldo Carvalho de Melo03ace392005-08-21 05:36:45 -0300313 dp->dccps_awh = dp->dccps_gss = seq;
314 dccp_set_seqno(&dp->dccps_awl,
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -0300315 (dp->dccps_gss -
316 dp->dccps_options.dccpo_sequence_window + 1));
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700317}
Arnaldo Carvalho de Meloae31c332005-09-18 00:17:51 -0700318
319static inline int dccp_ack_pending(const struct sock *sk)
320{
321 const struct dccp_sock *dp = dccp_sk(sk);
322 return dp->dccps_timestamp_echo != 0 ||
323#ifdef CONFIG_IP_DCCP_ACKVEC
324 (dp->dccps_options.dccpo_send_ack_vector &&
325 dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) ||
326#endif
327 inet_csk_ack_scheduled(sk);
328}
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700329
330extern void dccp_insert_options(struct sock *sk, struct sk_buff *skb);
331extern void dccp_insert_option_elapsed_time(struct sock *sk,
332 struct sk_buff *skb,
333 u32 elapsed_time);
Arnaldo Carvalho de Melod4b81ff2005-08-23 21:51:36 -0700334extern void dccp_insert_option_timestamp(struct sock *sk,
335 struct sk_buff *skb);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700336extern void dccp_insert_option(struct sock *sk, struct sk_buff *skb,
337 unsigned char option,
338 const void *value, unsigned char len);
339
340extern struct socket *dccp_ctl_socket;
341
Arnaldo Carvalho de Melob0e56782005-09-09 02:38:35 -0300342extern void dccp_timestamp(const struct sock *sk, struct timeval *tv);
343
Arnaldo Carvalho de Melob6ee3d42005-08-27 18:18:18 -0300344static inline suseconds_t timeval_usecs(const struct timeval *tv)
345{
346 return tv->tv_sec * USEC_PER_SEC + tv->tv_usec;
347}
348
349static inline suseconds_t timeval_delta(const struct timeval *large,
350 const struct timeval *small)
351{
352 time_t secs = large->tv_sec - small->tv_sec;
353 suseconds_t usecs = large->tv_usec - small->tv_usec;
354
355 if (usecs < 0) {
356 secs--;
357 usecs += USEC_PER_SEC;
358 }
359 return secs * USEC_PER_SEC + usecs;
360}
361
362static inline void timeval_add_usecs(struct timeval *tv,
363 const suseconds_t usecs)
364{
365 tv->tv_usec += usecs;
366 while (tv->tv_usec >= USEC_PER_SEC) {
367 tv->tv_sec++;
368 tv->tv_usec -= USEC_PER_SEC;
369 }
370}
371
372static inline void timeval_sub_usecs(struct timeval *tv,
373 const suseconds_t usecs)
374{
375 tv->tv_usec -= usecs;
376 while (tv->tv_usec < 0) {
377 tv->tv_sec--;
378 tv->tv_usec += USEC_PER_SEC;
379 }
380}
381
Arnaldo Carvalho de Meloe55d9122006-03-20 19:25:02 -0800382#ifdef CONFIG_SYSCTL
383extern int dccp_sysctl_init(void);
384extern void dccp_sysctl_exit(void);
385#else
386static inline int dccp_sysctl_init(void)
387{
388 return 0;
389}
390
391static inline void dccp_sysctl_exit(void)
392{
393}
394#endif
395
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700396#endif /* _DCCP_H */