projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
[TCP]: Don't set SKB owner in tcp_transmit_skb().
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / dccp / dccp.h
CommitLineData
7c657876
ACM		 1#ifndef _DCCP_H
2#define _DCCP_H
3/*
4 * net/dccp/dccp.h
5 *
6 * An implementation of the DCCP protocol
1bc09869 7 * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
e6bccd35 8 * Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.nz>
7c657876
ACM		 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>
ae31c339 19#include "ackvec.h"
7c657876 20
725ba8ee 21#ifdef CONFIG_IP_DCCP_DEBUG
7c657876
ACM		 22extern 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)
7690af3f
ACM		 28#define dccp_pr_debug_cat(format, a...) do { if (dccp_debug) \
29 printk(format, ##a); } while (0)
7c657876
ACM		 30#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
0e64e94e 53/* RFC 1122, 4.2.3.1 initial RTO value */
7c657876
ACM		 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
7c657876 61/* is seq1 < seq2 ? */
a10cedd4 62static inline int before48(const u64 seq1, const u64 seq2)
7c657876 63{
a10cedd4 64 return (s64)((seq1 << 16) - (seq2 << 16)) < 0;
7c657876
ACM		 65}
66
67/* is seq1 > seq2 ? */
a10cedd4 68static inline int after48(const u64 seq1, const u64 seq2)
7c657876 69{
a10cedd4 70 return (s64)((seq2 << 16) - (seq1 << 16)) < 0;
7c657876
ACM		 71}
72
73/* is seq2 <= seq1 <= seq3 ? */
a10cedd4 74static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3)
7c657876
ACM		 75{
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
837d107c
IM		 84/* is seq1 next seqno after seq2 */
85static inline int follows48(const u64 seq1, const u64 seq2)
86{
87 int diff = (seq1 & 0xFFFF) - (seq2 & 0xFFFF);
88
89 return diff==1;
90}
91
7c657876
ACM		 92enum {
93 DCCP_MIB_NUM = 0,
94 DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */
95 DCCP_MIB_ESTABRESETS, /* EstabResets */
96 DCCP_MIB_CURRESTAB, /* CurrEstab */
97 DCCP_MIB_OUTSEGS, /* OutSegs */
98 DCCP_MIB_OUTRSTS,
99 DCCP_MIB_ABORTONTIMEOUT,
100 DCCP_MIB_TIMEOUTS,
101 DCCP_MIB_ABORTFAILED,
102 DCCP_MIB_PASSIVEOPENS,
103 DCCP_MIB_ATTEMPTFAILS,
104 DCCP_MIB_OUTDATAGRAMS,
105 DCCP_MIB_INERRS,
106 DCCP_MIB_OPTMANDATORYERROR,
107 DCCP_MIB_INVALIDOPT,
108 __DCCP_MIB_MAX
109};
110
111#define DCCP_MIB_MAX __DCCP_MIB_MAX
112struct dccp_mib {
113 unsigned long mibs[DCCP_MIB_MAX];
114} __SNMP_MIB_ALIGN__;
115
116DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics);
7690af3f
ACM		 117#define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field)
118#define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field)
119#define DCCP_INC_STATS_USER(field) SNMP_INC_STATS_USER(dccp_statistics, field)
120#define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field)
121#define DCCP_ADD_STATS_BH(field, val) \
122 SNMP_ADD_STATS_BH(dccp_statistics, field, val)
123#define DCCP_ADD_STATS_USER(field, val) \
124 SNMP_ADD_STATS_USER(dccp_statistics, field, val)
7c657876 125
7c657876
ACM		 126extern int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb);
127
7c657876
ACM		 128extern void dccp_send_ack(struct sock *sk);
129extern void dccp_send_delayed_ack(struct sock *sk);
e92ae93a
ACM		 130extern void dccp_send_sync(struct sock *sk, const u64 seq,
131 const enum dccp_pkt_type pkt_type);
7c657876 132
97e5848d 133extern void dccp_write_xmit(struct sock *sk, int block);
c530cfb1 134extern void dccp_write_space(struct sock *sk);
27258ee5 135
7c657876
ACM		 136extern void dccp_init_xmit_timers(struct sock *sk);
137static inline void dccp_clear_xmit_timers(struct sock *sk)
138{
139 inet_csk_clear_xmit_timers(sk);
140}
141
142extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu);
143
144extern const char *dccp_packet_name(const int type);
145extern const char *dccp_state_name(const int state);
146
c25a18ba
ACM		 147extern void dccp_set_state(struct sock *sk, const int state);
148extern void dccp_done(struct sock *sk);
7c657876
ACM		 149
150static inline void dccp_openreq_init(struct request_sock *req,
151 struct dccp_sock *dp,
152 struct sk_buff *skb)
153{
154 /*
155 * FIXME: fill in the other req fields from the DCCP options
156 * received
157 */
158 inet_rsk(req)->rmt_port = dccp_hdr(skb)->dccph_sport;
159 inet_rsk(req)->acked = 0;
160 req->rcv_wnd = 0;
161}
162
7c657876
ACM		 163extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb);
164
165extern struct sock *dccp_create_openreq_child(struct sock *sk,
166 const struct request_sock *req,
167 const struct sk_buff *skb);
168
169extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb);
170
7c657876
ACM		 171extern struct sock *dccp_v4_request_recv_sock(struct sock *sk,
172 struct sk_buff *skb,
173 struct request_sock *req,
174 struct dst_entry *dst);
175extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb,
176 struct request_sock *req,
177 struct request_sock **prev);
178
179extern int dccp_child_process(struct sock *parent, struct sock *child,
180 struct sk_buff *skb);
181extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
182 struct dccp_hdr *dh, unsigned len);
183extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
184 const struct dccp_hdr *dh, const unsigned len);
185
72478873 186extern int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized);
3e0fadc5 187extern int dccp_destroy_sock(struct sock *sk);
f21e68ca 188
7c657876
ACM		 189extern void dccp_close(struct sock *sk, long timeout);
190extern struct sk_buff *dccp_make_response(struct sock *sk,
191 struct dst_entry *dst,
192 struct request_sock *req);
193
194extern int dccp_connect(struct sock *sk);
195extern int dccp_disconnect(struct sock *sk, int flags);
c985ed70 196extern void dccp_hash(struct sock *sk);
f21e68ca 197extern void dccp_unhash(struct sock *sk);
7c657876 198extern int dccp_getsockopt(struct sock *sk, int level, int optname,
a1d3a355
ACM		 199 char __user *optval, int __user *optlen);
200extern int dccp_setsockopt(struct sock *sk, int level, int optname,
201 char __user *optval, int optlen);
3fdadf7d
DM		 202#ifdef CONFIG_COMPAT
203extern int compat_dccp_getsockopt(struct sock *sk,
204 int level, int optname,
205 char __user *optval, int __user *optlen);
206extern int compat_dccp_setsockopt(struct sock *sk,
207 int level, int optname,
208 char __user *optval, int optlen);
209#endif
7c657876 210extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg);
7690af3f
ACM		 211extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk,
212 struct msghdr *msg, size_t size);
7c657876
ACM		 213extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk,
214 struct msghdr *msg, size_t len, int nonblock,
215 int flags, int *addr_len);
7c657876 216extern void dccp_shutdown(struct sock *sk, int how);
f21e68ca
ACM		 217extern int inet_dccp_listen(struct socket *sock, int backlog);
218extern unsigned int dccp_poll(struct file *file, struct socket *sock,
219 poll_table *wait);
220extern void dccp_v4_send_check(struct sock *sk, int len,
221 struct sk_buff *skb);
222extern int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr,
223 int addr_len);
7c657876 224
95b81ef7 225extern int dccp_v4_checksum(const struct sk_buff *skb,
60fe62e7 226 const __be32 saddr, const __be32 daddr);
7c657876 227
017487d7 228extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code);
7ad07e7c 229extern void dccp_send_close(struct sock *sk, const int active);
f21e68ca
ACM		 230extern int dccp_invalid_packet(struct sk_buff *skb);
231
232static inline int dccp_bad_service_code(const struct sock *sk,
60fe62e7 233 const __be32 service)
f21e68ca
ACM		 234{
235 const struct dccp_sock *dp = dccp_sk(sk);
236
237 if (dp->dccps_service == service)
238 return 0;
239 return !dccp_list_has_service(dp->dccps_service_list, service);
240}
7c657876
ACM		 241
242struct dccp_skb_cb {
67e6b629
ACM		 243 __u8 dccpd_type:4;
244 __u8 dccpd_ccval:4;
245 __u8 dccpd_reset_code;
246 __u16 dccpd_opt_len;
7c657876
ACM		 247 __u64 dccpd_seq;
248 __u64 dccpd_ack_seq;
7c657876
ACM		 249};
250
251#define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0]))
252
253static inline int dccp_non_data_packet(const struct sk_buff *skb)
254{
255 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
256
257 return type == DCCP_PKT_ACK ||
258 type == DCCP_PKT_CLOSE ||
259 type == DCCP_PKT_CLOSEREQ ||
260 type == DCCP_PKT_RESET ||
261 type == DCCP_PKT_SYNC ||
262 type == DCCP_PKT_SYNCACK;
263}
264
265static inline int dccp_packet_without_ack(const struct sk_buff *skb)
266{
267 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
268
269 return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST;
270}
271
272#define DCCP_MAX_SEQNO ((((u64)1) << 48) - 1)
273#define DCCP_PKT_WITHOUT_ACK_SEQ (DCCP_MAX_SEQNO << 2)
274
275static inline void dccp_set_seqno(u64 *seqno, u64 value)
276{
277 if (value > DCCP_MAX_SEQNO)
278 value -= DCCP_MAX_SEQNO + 1;
279 *seqno = value;
280}
281
282static inline u64 dccp_delta_seqno(u64 seqno1, u64 seqno2)
283{
284 return ((seqno2 << 16) - (seqno1 << 16)) >> 16;
285}
286
287static inline void dccp_inc_seqno(u64 *seqno)
288{
289 if (++*seqno > DCCP_MAX_SEQNO)
290 *seqno = 0;
291}
292
293static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss)
294{
7690af3f
ACM		 295 struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh +
296 sizeof(*dh));
60fe62e7
AB		 297 dh->dccph_seq2 = 0;
298 dh->dccph_seq = htons((gss >> 32) & 0xfffff);
7c657876
ACM		 299 dhx->dccph_seq_low = htonl(gss & 0xffffffff);
300}
301
7690af3f
ACM		 302static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack,
303 const u64 gsr)
7c657876 304{
60fe62e7
AB		 305 dhack->dccph_reserved1 = 0;
306 dhack->dccph_ack_nr_high = htons(gsr >> 32);
7c657876
ACM		 307 dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff);
308}
309
310static inline void dccp_update_gsr(struct sock *sk, u64 seq)
311{
312 struct dccp_sock *dp = dccp_sk(sk);
a4bf3902 313 const struct dccp_minisock *dmsk = dccp_msk(sk);
7c657876 314
03ace394
ACM		 315 dp->dccps_gsr = seq;
316 dccp_set_seqno(&dp->dccps_swl,
a4bf3902 317 dp->dccps_gsr + 1 - (dmsk->dccpms_sequence_window / 4));
7c657876 318 dccp_set_seqno(&dp->dccps_swh,
a4bf3902 319 dp->dccps_gsr + (3 * dmsk->dccpms_sequence_window) / 4);
7c657876
ACM		 320}
321
322static inline void dccp_update_gss(struct sock *sk, u64 seq)
323{
324 struct dccp_sock *dp = dccp_sk(sk);
7c657876 325
03ace394
ACM		 326 dp->dccps_awh = dp->dccps_gss = seq;
327 dccp_set_seqno(&dp->dccps_awl,
7690af3f 328 (dp->dccps_gss -
a4bf3902 329 dccp_msk(sk)->dccpms_sequence_window + 1));
7c657876 330}
ae31c339
ACM		 331
332static inline int dccp_ack_pending(const struct sock *sk)
333{
334 const struct dccp_sock *dp = dccp_sk(sk);
335 return dp->dccps_timestamp_echo != 0 ||
336#ifdef CONFIG_IP_DCCP_ACKVEC
a4bf3902 337 (dccp_msk(sk)->dccpms_send_ack_vector &&
ae31c339
ACM		 338 dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) ||
339#endif
340 inet_csk_ack_scheduled(sk);
341}
7c657876 342
2d0817d1
ACM		 343extern int dccp_insert_options(struct sock *sk, struct sk_buff *skb);
344extern int dccp_insert_option_elapsed_time(struct sock *sk,
7c657876
ACM		 345 struct sk_buff *skb,
346 u32 elapsed_time);
2d0817d1 347extern int dccp_insert_option_timestamp(struct sock *sk,
d4b81ff7 348 struct sk_buff *skb);
2d0817d1 349extern int dccp_insert_option(struct sock *sk, struct sk_buff *skb,
7c657876
ACM		 350 unsigned char option,
351 const void *value, unsigned char len);
352
b0e56780
ACM		 353extern void dccp_timestamp(const struct sock *sk, struct timeval *tv);
354
b6ee3d4a
ACM		 355static inline suseconds_t timeval_usecs(const struct timeval *tv)
356{
357 return tv->tv_sec * USEC_PER_SEC + tv->tv_usec;
358}
359
360static inline suseconds_t timeval_delta(const struct timeval *large,
361 const struct timeval *small)
362{
363 time_t secs = large->tv_sec - small->tv_sec;
364 suseconds_t usecs = large->tv_usec - small->tv_usec;
365
366 if (usecs < 0) {
367 secs--;
368 usecs += USEC_PER_SEC;
369 }
370 return secs * USEC_PER_SEC + usecs;
371}
372
373static inline void timeval_add_usecs(struct timeval *tv,
374 const suseconds_t usecs)
375{
376 tv->tv_usec += usecs;
377 while (tv->tv_usec >= USEC_PER_SEC) {
378 tv->tv_sec++;
379 tv->tv_usec -= USEC_PER_SEC;
380 }
381}
382
383static inline void timeval_sub_usecs(struct timeval *tv,
384 const suseconds_t usecs)
385{
386 tv->tv_usec -= usecs;
387 while (tv->tv_usec < 0) {
388 tv->tv_sec--;
389 tv->tv_usec += USEC_PER_SEC;
390 }
391}
392
e55d912f
ACM		 393#ifdef CONFIG_SYSCTL
394extern int dccp_sysctl_init(void);
395extern void dccp_sysctl_exit(void);
396#else
397static inline int dccp_sysctl_init(void)
398{
399 return 0;
400}
401
402static inline void dccp_sysctl_exit(void)
403{
404}
405#endif
406
7c657876 407#endif /* _DCCP_H */
kernel source for telekom puls (alcatel/mediatek)