projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
pkt_sched: Fix "parent is root" test in qdisc_create().
[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>
9823b7b5 16#include <linux/ktime.h>
7c657876
ACM		 17#include <net/snmp.h>
18#include <net/sock.h>
19#include <net/tcp.h>
ae31c339 20#include "ackvec.h"
7c657876 21
59348b19
GR		 22/*
23 * DCCP - specific warning and debugging macros.
24 */
25#define DCCP_WARN(fmt, a...) LIMIT_NETDEBUG(KERN_WARNING "%s: " fmt, \
0dc47877 26 __func__, ##a)
59348b19 27#define DCCP_CRIT(fmt, a...) printk(KERN_CRIT fmt " at %s:%d/%s()\n", ##a, \
0dc47877 28 __FILE__, __LINE__, __func__)
59348b19
GR		 29#define DCCP_BUG(a...) do { DCCP_CRIT("BUG: " a); dump_stack(); } while(0)
30#define DCCP_BUG_ON(cond) do { if (unlikely((cond) != 0)) \
31 DCCP_BUG("\"%s\" holds (exception!)", \
32 __stringify(cond)); \
3c695262
GR		 33 } while (0)
34
84116716
GR		 35#define DCCP_PRINTK(enable, fmt, args...) do { if (enable) \
36 printk(fmt, ##args); \
c9eaf173 37 } while(0)
84116716 38#define DCCP_PR_DEBUG(enable, fmt, a...) DCCP_PRINTK(enable, KERN_DEBUG \
0dc47877 39 "%s: " fmt, __func__, ##a)
84116716 40
725ba8ee 41#ifdef CONFIG_IP_DCCP_DEBUG
7c657876 42extern int dccp_debug;
84116716
GR		 43#define dccp_pr_debug(format, a...) DCCP_PR_DEBUG(dccp_debug, format, ##a)
44#define dccp_pr_debug_cat(format, a...) DCCP_PRINTK(dccp_debug, format, ##a)
7c657876
ACM		 45#else
46#define dccp_pr_debug(format, a...)
47#define dccp_pr_debug_cat(format, a...)
48#endif
49
50extern struct inet_hashinfo dccp_hashinfo;
51
52extern atomic_t dccp_orphan_count;
7c657876
ACM		 53
54extern void dccp_time_wait(struct sock *sk, int state, int timeo);
55
60361be1
GR		 56/*
57 * Set safe upper bounds for header and option length. Since Data Offset is 8
58 * bits (RFC 4340, sec. 5.1), the total header length can never be more than
59 * 4 * 255 = 1020 bytes. The largest possible header length is 28 bytes (X=1):
60 * - DCCP-Response with ACK Subheader and 4 bytes of Service code OR
61 * - DCCP-Reset with ACK Subheader and 4 bytes of Reset Code fields
62 * Hence a safe upper bound for the maximum option length is 1020-28 = 992
63 */
64#define MAX_DCCP_SPECIFIC_HEADER (255 * sizeof(int))
65#define DCCP_MAX_PACKET_HDR 28
66#define DCCP_MAX_OPT_LEN (MAX_DCCP_SPECIFIC_HEADER - DCCP_MAX_PACKET_HDR)
67#define MAX_DCCP_HEADER (MAX_DCCP_SPECIFIC_HEADER + MAX_HEADER)
7c657876
ACM		 68
69#define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT
70 * state, about 60 seconds */
71
0e64e94e 72/* RFC 1122, 4.2.3.1 initial RTO value */
7c657876
ACM		 73#define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ))
74
28be5440
GR		 75/*
76 * The maximum back-off value for retransmissions. This is needed for
77 * - retransmitting client-Requests (sec. 8.1.1),
78 * - retransmitting Close/CloseReq when closing (sec. 8.3),
79 * - feature-negotiation retransmission (sec. 6.6.3),
80 * - Acks in client-PARTOPEN state (sec. 8.1.5).
81 */
82#define DCCP_RTO_MAX ((unsigned)(64 * HZ))
4712a792 83
954c2db8
GR		 84/*
85 * RTT sampling: sanity bounds and fallback RTT value from RFC 4340, section 3.4
86 */
4712a792 87#define DCCP_SANE_RTT_MIN 100
954c2db8
GR		 88#define DCCP_FALLBACK_RTT (USEC_PER_SEC / 5)
89#define DCCP_SANE_RTT_MAX (3 * USEC_PER_SEC)
4712a792 90
7c657876
ACM		 91/* Maximal interval between probes for local resources. */
92#define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U))
93
2e2e9e92
GR		 94/* sysctl variables for DCCP */
95extern int sysctl_dccp_request_retries;
96extern int sysctl_dccp_retries1;
97extern int sysctl_dccp_retries2;
afb0a34d
GR		 98extern int sysctl_dccp_feat_sequence_window;
99extern int sysctl_dccp_feat_rx_ccid;
100extern int sysctl_dccp_feat_tx_ccid;
101extern int sysctl_dccp_feat_ack_ratio;
102extern int sysctl_dccp_feat_send_ack_vector;
103extern int sysctl_dccp_feat_send_ndp_count;
b1308dc0 104extern int sysctl_dccp_tx_qlen;
a94f0f97 105extern int sysctl_dccp_sync_ratelimit;
2e2e9e92 106
6b811d43
GR		 107/*
108 * 48-bit sequence number arithmetic (signed and unsigned)
109 */
110#define INT48_MIN 0x800000000000LL /* 2^47 */
111#define UINT48_MAX 0xFFFFFFFFFFFFLL /* 2^48 - 1 */
112#define COMPLEMENT48(x) (0x1000000000000LL - (x)) /* 2^48 - x */
113#define TO_SIGNED48(x) (((x) < INT48_MIN)? (x) : -COMPLEMENT48( (x)))
114#define TO_UNSIGNED48(x) (((x) >= 0)? (x) : COMPLEMENT48(-(x)))
115#define ADD48(a, b) (((a) + (b)) & UINT48_MAX)
116#define SUB48(a, b) ADD48((a), COMPLEMENT48(b))
117
118static inline void dccp_set_seqno(u64 *seqno, u64 value)
119{
120 *seqno = value & UINT48_MAX;
121}
122
123static inline void dccp_inc_seqno(u64 *seqno)
124{
125 *seqno = ADD48(*seqno, 1);
126}
127
0aec51c8
GR		 128/* signed mod-2^48 distance: pos. if seqno1 < seqno2, neg. if seqno1 > seqno2 */
129static inline s64 dccp_delta_seqno(const u64 seqno1, const u64 seqno2)
6b811d43 130{
0aec51c8
GR		 131 u64 delta = SUB48(seqno2, seqno1);
132
133 return TO_SIGNED48(delta);
6b811d43
GR		 134}
135
7c657876 136/* is seq1 < seq2 ? */
a10cedd4 137static inline int before48(const u64 seq1, const u64 seq2)
7c657876 138{
d52de17b 139 return (s64)((seq2 << 16) - (seq1 << 16)) > 0;
7c657876
ACM		 140}
141
142/* is seq1 > seq2 ? */
d52de17b 143#define after48(seq1, seq2) before48(seq2, seq1)
7c657876
ACM		 144
145/* is seq2 <= seq1 <= seq3 ? */
a10cedd4 146static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3)
7c657876
ACM		 147{
148 return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16);
149}
150
151static inline u64 max48(const u64 seq1, const u64 seq2)
152{
153 return after48(seq1, seq2) ? seq1 : seq2;
154}
155
2013c7e3
GR		 156/**
157 * dccp_loss_free - Evaluates condition for data loss from RFC 4340, 7.7.1
158 * @s1: start sequence number
159 * @s2: end sequence number
160 * @ndp: NDP count on packet with sequence number @s2
161 * Returns true if the sequence range s1...s2 has no data loss.
162 */
163static inline bool dccp_loss_free(const u64 s1, const u64 s2, const u64 ndp)
164{
165 s64 delta = dccp_delta_seqno(s1, s2);
166
547b792c 167 WARN_ON(delta < 0);
2013c7e3
GR		 168 return (u64)delta <= ndp + 1;
169}
170
7c657876
ACM		 171enum {
172 DCCP_MIB_NUM = 0,
173 DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */
174 DCCP_MIB_ESTABRESETS, /* EstabResets */
175 DCCP_MIB_CURRESTAB, /* CurrEstab */
c9eaf173 176 DCCP_MIB_OUTSEGS, /* OutSegs */
7c657876
ACM		 177 DCCP_MIB_OUTRSTS,
178 DCCP_MIB_ABORTONTIMEOUT,
179 DCCP_MIB_TIMEOUTS,
180 DCCP_MIB_ABORTFAILED,
181 DCCP_MIB_PASSIVEOPENS,
182 DCCP_MIB_ATTEMPTFAILS,
183 DCCP_MIB_OUTDATAGRAMS,
184 DCCP_MIB_INERRS,
185 DCCP_MIB_OPTMANDATORYERROR,
186 DCCP_MIB_INVALIDOPT,
187 __DCCP_MIB_MAX
188};
189
190#define DCCP_MIB_MAX __DCCP_MIB_MAX
191struct dccp_mib {
192 unsigned long mibs[DCCP_MIB_MAX];
193} __SNMP_MIB_ALIGN__;
194
195DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics);
7690af3f
ACM		 196#define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field)
197#define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field)
198#define DCCP_INC_STATS_USER(field) SNMP_INC_STATS_USER(dccp_statistics, field)
199#define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field)
200#define DCCP_ADD_STATS_BH(field, val) \
201 SNMP_ADD_STATS_BH(dccp_statistics, field, val)
202#define DCCP_ADD_STATS_USER(field, val) \
203 SNMP_ADD_STATS_USER(dccp_statistics, field, val)
7c657876 204
6f4e5fff
GR		 205/*
206 * Checksumming routines
207 */
e961811f 208static inline unsigned int dccp_csum_coverage(const struct sk_buff *skb)
6f4e5fff
GR		 209{
210 const struct dccp_hdr* dh = dccp_hdr(skb);
211
212 if (dh->dccph_cscov == 0)
213 return skb->len;
214 return (dh->dccph_doff + dh->dccph_cscov - 1) * sizeof(u32);
215}
216
217static inline void dccp_csum_outgoing(struct sk_buff *skb)
218{
e961811f 219 unsigned int cov = dccp_csum_coverage(skb);
6f4e5fff
GR		 220
221 if (cov >= skb->len)
222 dccp_hdr(skb)->dccph_cscov = 0;
223
224 skb->csum = skb_checksum(skb, 0, (cov > skb->len)? skb->len : cov, 0);
225}
226
227extern void dccp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb);
228
59435444 229extern int dccp_retransmit_skb(struct sock *sk);
7c657876 230
7c657876 231extern void dccp_send_ack(struct sock *sk);
8a73cd09
GR		 232extern void dccp_reqsk_send_ack(struct sk_buff *sk, struct request_sock *rsk);
233
e92ae93a
ACM		 234extern void dccp_send_sync(struct sock *sk, const u64 seq,
235 const enum dccp_pkt_type pkt_type);
7c657876 236
97e5848d 237extern void dccp_write_xmit(struct sock *sk, int block);
c530cfb1 238extern void dccp_write_space(struct sock *sk);
27258ee5 239
7c657876
ACM		 240extern void dccp_init_xmit_timers(struct sock *sk);
241static inline void dccp_clear_xmit_timers(struct sock *sk)
242{
243 inet_csk_clear_xmit_timers(sk);
244}
245
246extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu);
247
248extern const char *dccp_packet_name(const int type);
249extern const char *dccp_state_name(const int state);
250
c25a18ba
ACM		 251extern void dccp_set_state(struct sock *sk, const int state);
252extern void dccp_done(struct sock *sk);
7c657876 253
cf557926 254extern void dccp_reqsk_init(struct request_sock *req, struct sk_buff *skb);
7c657876 255
7c657876
ACM		 256extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb);
257
258extern struct sock *dccp_create_openreq_child(struct sock *sk,
259 const struct request_sock *req,
260 const struct sk_buff *skb);
261
262extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb);
263
7c657876
ACM		 264extern struct sock *dccp_v4_request_recv_sock(struct sock *sk,
265 struct sk_buff *skb,
266 struct request_sock *req,
267 struct dst_entry *dst);
268extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb,
269 struct request_sock *req,
270 struct request_sock **prev);
271
272extern int dccp_child_process(struct sock *parent, struct sock *child,
273 struct sk_buff *skb);
274extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
275 struct dccp_hdr *dh, unsigned len);
276extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
277 const struct dccp_hdr *dh, const unsigned len);
278
72478873 279extern int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized);
7d06b2e0 280extern void dccp_destroy_sock(struct sock *sk);
f21e68ca 281
7c657876
ACM		 282extern void dccp_close(struct sock *sk, long timeout);
283extern struct sk_buff *dccp_make_response(struct sock *sk,
284 struct dst_entry *dst,
285 struct request_sock *req);
286
287extern int dccp_connect(struct sock *sk);
288extern int dccp_disconnect(struct sock *sk, int flags);
289extern int dccp_getsockopt(struct sock *sk, int level, int optname,
a1d3a355
ACM		 290 char __user *optval, int __user *optlen);
291extern int dccp_setsockopt(struct sock *sk, int level, int optname,
292 char __user *optval, int optlen);
3fdadf7d
DM		 293#ifdef CONFIG_COMPAT
294extern int compat_dccp_getsockopt(struct sock *sk,
295 int level, int optname,
296 char __user *optval, int __user *optlen);
297extern int compat_dccp_setsockopt(struct sock *sk,
298 int level, int optname,
299 char __user *optval, int optlen);
300#endif
7c657876 301extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg);
7690af3f
ACM		 302extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk,
303 struct msghdr *msg, size_t size);
7c657876
ACM		 304extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk,
305 struct msghdr *msg, size_t len, int nonblock,
306 int flags, int *addr_len);
7c657876 307extern void dccp_shutdown(struct sock *sk, int how);
f21e68ca
ACM		 308extern int inet_dccp_listen(struct socket *sock, int backlog);
309extern unsigned int dccp_poll(struct file *file, struct socket *sock,
310 poll_table *wait);
f21e68ca
ACM		 311extern int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr,
312 int addr_len);
7c657876 313
7630f026 314extern struct sk_buff *dccp_ctl_make_reset(struct sock *sk,
e356d37a 315 struct sk_buff *skb);
017487d7 316extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code);
7ad07e7c 317extern void dccp_send_close(struct sock *sk, const int active);
f21e68ca 318extern int dccp_invalid_packet(struct sk_buff *skb);
3393da82 319extern u32 dccp_sample_rtt(struct sock *sk, long delta);
f21e68ca
ACM		 320
321static inline int dccp_bad_service_code(const struct sock *sk,
60fe62e7 322 const __be32 service)
f21e68ca
ACM		 323{
324 const struct dccp_sock *dp = dccp_sk(sk);
325
326 if (dp->dccps_service == service)
327 return 0;
328 return !dccp_list_has_service(dp->dccps_service_list, service);
329}
7c657876 330
0430ee34
GR		 331/**
332 * dccp_skb_cb - DCCP per-packet control information
333 * @dccpd_type: one of %dccp_pkt_type (or unknown)
334 * @dccpd_ccval: CCVal field (5.1), see e.g. RFC 4342, 8.1
335 * @dccpd_reset_code: one of %dccp_reset_codes
336 * @dccpd_reset_data: Data1..3 fields (depend on @dccpd_reset_code)
337 * @dccpd_opt_len: total length of all options (5.8) in the packet
338 * @dccpd_seq: sequence number
339 * @dccpd_ack_seq: acknowledgment number subheader field value
340 * This is used for transmission as well as for reception.
341 */
7c657876 342struct dccp_skb_cb {
028b0275
PM		 343 union {
344 struct inet_skb_parm h4;
345#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
346 struct inet6_skb_parm h6;
347#endif
348 } header;
67e6b629
ACM		 349 __u8 dccpd_type:4;
350 __u8 dccpd_ccval:4;
0430ee34
GR		 351 __u8 dccpd_reset_code,
352 dccpd_reset_data[3];
67e6b629 353 __u16 dccpd_opt_len;
7c657876
ACM		 354 __u64 dccpd_seq;
355 __u64 dccpd_ack_seq;
7c657876
ACM		 356};
357
358#define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0]))
359
2180c41c 360/* RFC 4340, sec. 7.7 */
7c657876
ACM		 361static inline int dccp_non_data_packet(const struct sk_buff *skb)
362{
363 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
364
365 return type == DCCP_PKT_ACK ||
366 type == DCCP_PKT_CLOSE ||
367 type == DCCP_PKT_CLOSEREQ ||
368 type == DCCP_PKT_RESET ||
369 type == DCCP_PKT_SYNC ||
370 type == DCCP_PKT_SYNCACK;
371}
372
2180c41c
GR		 373/* RFC 4340, sec. 7.7 */
374static inline int dccp_data_packet(const struct sk_buff *skb)
375{
376 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
377
378 return type == DCCP_PKT_DATA ||
379 type == DCCP_PKT_DATAACK ||
380 type == DCCP_PKT_REQUEST ||
381 type == DCCP_PKT_RESPONSE;
382}
383
7c657876
ACM		 384static inline int dccp_packet_without_ack(const struct sk_buff *skb)
385{
386 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
387
388 return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST;
389}
390
6b811d43 391#define DCCP_PKT_WITHOUT_ACK_SEQ (UINT48_MAX << 2)
7c657876
ACM		 392
393static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss)
394{
7690af3f
ACM		 395 struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh +
396 sizeof(*dh));
60fe62e7
AB		 397 dh->dccph_seq2 = 0;
398 dh->dccph_seq = htons((gss >> 32) & 0xfffff);
7c657876
ACM		 399 dhx->dccph_seq_low = htonl(gss & 0xffffffff);
400}
401
7690af3f
ACM		 402static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack,
403 const u64 gsr)
7c657876 404{
60fe62e7
AB		 405 dhack->dccph_reserved1 = 0;
406 dhack->dccph_ack_nr_high = htons(gsr >> 32);
7c657876
ACM		 407 dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff);
408}
409
410static inline void dccp_update_gsr(struct sock *sk, u64 seq)
411{
412 struct dccp_sock *dp = dccp_sk(sk);
a4bf3902 413 const struct dccp_minisock *dmsk = dccp_msk(sk);
7c657876 414
03ace394
ACM		 415 dp->dccps_gsr = seq;
416 dccp_set_seqno(&dp->dccps_swl,
a4bf3902 417 dp->dccps_gsr + 1 - (dmsk->dccpms_sequence_window / 4));
7c657876 418 dccp_set_seqno(&dp->dccps_swh,
a4bf3902 419 dp->dccps_gsr + (3 * dmsk->dccpms_sequence_window) / 4);
7c657876
ACM		 420}
421
422static inline void dccp_update_gss(struct sock *sk, u64 seq)
423{
424 struct dccp_sock *dp = dccp_sk(sk);
7c657876 425
03ace394
ACM		 426 dp->dccps_awh = dp->dccps_gss = seq;
427 dccp_set_seqno(&dp->dccps_awl,
7690af3f 428 (dp->dccps_gss -
a4bf3902 429 dccp_msk(sk)->dccpms_sequence_window + 1));
7c657876 430}
c9eaf173 431
ae31c339
ACM		 432static inline int dccp_ack_pending(const struct sock *sk)
433{
434 const struct dccp_sock *dp = dccp_sk(sk);
435 return dp->dccps_timestamp_echo != 0 ||
436#ifdef CONFIG_IP_DCCP_ACKVEC
a4bf3902 437 (dccp_msk(sk)->dccpms_send_ack_vector &&
ae31c339
ACM		 438 dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) ||
439#endif
440 inet_csk_ack_scheduled(sk);
441}
7c657876 442
2d0817d1 443extern int dccp_insert_options(struct sock *sk, struct sk_buff *skb);
af3b867e 444extern int dccp_insert_options_rsk(struct dccp_request_sock*, struct sk_buff*);
2d0817d1 445extern int dccp_insert_option_elapsed_time(struct sock *sk,
7c657876
ACM		 446 struct sk_buff *skb,
447 u32 elapsed_time);
4c70f383
GR		 448extern u32 dccp_timestamp(void);
449extern void dccp_timestamping_init(void);
2d0817d1 450extern int dccp_insert_option_timestamp(struct sock *sk,
d4b81ff7 451 struct sk_buff *skb);
2d0817d1 452extern int dccp_insert_option(struct sock *sk, struct sk_buff *skb,
7c657876
ACM		 453 unsigned char option,
454 const void *value, unsigned char len);
455
e55d912f
ACM		 456#ifdef CONFIG_SYSCTL
457extern int dccp_sysctl_init(void);
458extern void dccp_sysctl_exit(void);
459#else
460static inline int dccp_sysctl_init(void)
461{
462 return 0;
463}
464
465static inline void dccp_sysctl_exit(void)
466{
467}
468#endif
469
7c657876 470#endif /* _DCCP_H */
kernel source for telekom puls (alcatel/mediatek)