1#ifndef _DCCP_H
2#define _DCCP_H
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15#include <linux/dccp.h>
16#include <linux/ktime.h>
17#include <net/snmp.h>
18#include <net/sock.h>
19#include <net/tcp.h>
20#include "ackvec.h"
21
22
23
24
25#define DCCP_WARN(fmt, a...) LIMIT_NETDEBUG(KERN_WARNING "%s: " fmt, \
26 __func__, ##a)
27#define DCCP_CRIT(fmt, a...) printk(KERN_CRIT fmt " at %s:%d/%s()\n", ##a, \
28 __FILE__, __LINE__, __func__)
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)); \
33 } while (0)
34
35#define DCCP_PRINTK(enable, fmt, args...) do { if (enable) \
36 printk(fmt, ##args); \
37 } while(0)
38#define DCCP_PR_DEBUG(enable, fmt, a...) DCCP_PRINTK(enable, KERN_DEBUG \
39 "%s: " fmt, __func__, ##a)
40
41#ifdef CONFIG_IP_DCCP_DEBUG
42extern int dccp_debug;
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)
45#define dccp_debug(fmt, a...) dccp_pr_debug_cat(KERN_DEBUG fmt, ##a)
46#else
47#define dccp_pr_debug(format, a...)
48#define dccp_pr_debug_cat(format, a...)
49#define dccp_debug(format, a...)
50#endif
51
52extern struct inet_hashinfo dccp_hashinfo;
53
54extern struct percpu_counter dccp_orphan_count;
55
56extern void dccp_time_wait(struct sock *sk, int state, int timeo);
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64
65
66#define MAX_DCCP_SPECIFIC_HEADER (255 * sizeof(uint32_t))
67#define DCCP_MAX_PACKET_HDR 28
68#define DCCP_MAX_OPT_LEN (MAX_DCCP_SPECIFIC_HEADER - DCCP_MAX_PACKET_HDR)
69#define MAX_DCCP_HEADER (MAX_DCCP_SPECIFIC_HEADER + MAX_HEADER)
70
71
72#define DCCP_FEATNEG_OVERHEAD (32 * sizeof(uint32_t))
73
74#define DCCP_TIMEWAIT_LEN (60 * HZ)
75
76
77
78#define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ))
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85
86
87#define DCCP_RTO_MAX ((unsigned)(64 * HZ))
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91
92#define DCCP_SANE_RTT_MIN 100
93#define DCCP_FALLBACK_RTT (USEC_PER_SEC / 5)
94#define DCCP_SANE_RTT_MAX (3 * USEC_PER_SEC)
95
96
97extern int sysctl_dccp_request_retries;
98extern int sysctl_dccp_retries1;
99extern int sysctl_dccp_retries2;
100extern int sysctl_dccp_tx_qlen;
101extern int sysctl_dccp_sync_ratelimit;
102
103
104
105
106#define INT48_MIN 0x800000000000LL
107#define UINT48_MAX 0xFFFFFFFFFFFFLL
108#define COMPLEMENT48(x) (0x1000000000000LL - (x))
109#define TO_SIGNED48(x) (((x) < INT48_MIN)? (x) : -COMPLEMENT48( (x)))
110#define TO_UNSIGNED48(x) (((x) >= 0)? (x) : COMPLEMENT48(-(x)))
111#define ADD48(a, b) (((a) + (b)) & UINT48_MAX)
112#define SUB48(a, b) ADD48((a), COMPLEMENT48(b))
113
114static inline void dccp_set_seqno(u64 *seqno, u64 value)
115{
116 *seqno = value & UINT48_MAX;
117}
118
119static inline void dccp_inc_seqno(u64 *seqno)
120{
121 *seqno = ADD48(*seqno, 1);
122}
123
124
125static inline s64 dccp_delta_seqno(const u64 seqno1, const u64 seqno2)
126{
127 u64 delta = SUB48(seqno2, seqno1);
128
129 return TO_SIGNED48(delta);
130}
131
132
133static inline int before48(const u64 seq1, const u64 seq2)
134{
135 return (s64)((seq2 << 16) - (seq1 << 16)) > 0;
136}
137
138
139#define after48(seq1, seq2) before48(seq2, seq1)
140
141
142static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3)
143{
144 return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16);
145}
146
147static inline u64 max48(const u64 seq1, const u64 seq2)
148{
149 return after48(seq1, seq2) ? seq1 : seq2;
150}
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157
158static inline u64 dccp_loss_count(const u64 s1, const u64 s2, const u64 ndp)
159{
160 s64 delta = dccp_delta_seqno(s1, s2);
161
162 WARN_ON(delta < 0);
163 delta -= ndp + 1;
164
165 return delta > 0 ? delta : 0;
166}
167
168
169
170
171static inline bool dccp_loss_free(const u64 s1, const u64 s2, const u64 ndp)
172{
173 return dccp_loss_count(s1, s2, ndp) == 0;
174}
175
176enum {
177 DCCP_MIB_NUM = 0,
178 DCCP_MIB_ACTIVEOPENS,
179 DCCP_MIB_ESTABRESETS,
180 DCCP_MIB_CURRESTAB,
181 DCCP_MIB_OUTSEGS,
182 DCCP_MIB_OUTRSTS,
183 DCCP_MIB_ABORTONTIMEOUT,
184 DCCP_MIB_TIMEOUTS,
185 DCCP_MIB_ABORTFAILED,
186 DCCP_MIB_PASSIVEOPENS,
187 DCCP_MIB_ATTEMPTFAILS,
188 DCCP_MIB_OUTDATAGRAMS,
189 DCCP_MIB_INERRS,
190 DCCP_MIB_OPTMANDATORYERROR,
191 DCCP_MIB_INVALIDOPT,
192 __DCCP_MIB_MAX
193};
194
195#define DCCP_MIB_MAX __DCCP_MIB_MAX
196struct dccp_mib {
197 unsigned long mibs[DCCP_MIB_MAX];
198};
199
200DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics);
201#define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field)
202#define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field)
203#define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field)
204
205
206
207
208static inline unsigned int dccp_csum_coverage(const struct sk_buff *skb)
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{
219 unsigned int cov = dccp_csum_coverage(skb);
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, struct sk_buff *skb);
228
229extern int dccp_retransmit_skb(struct sock *sk);
230
231extern void dccp_send_ack(struct sock *sk);
232extern void dccp_reqsk_send_ack(struct sock *sk, struct sk_buff *skb,
233 struct request_sock *rsk);
234
235extern void dccp_send_sync(struct sock *sk, const u64 seq,
236 const enum dccp_pkt_type pkt_type);
237
238
239
240
241extern void dccp_qpolicy_push(struct sock *sk, struct sk_buff *skb);
242extern bool dccp_qpolicy_full(struct sock *sk);
243extern void dccp_qpolicy_drop(struct sock *sk, struct sk_buff *skb);
244extern struct sk_buff *dccp_qpolicy_top(struct sock *sk);
245extern struct sk_buff *dccp_qpolicy_pop(struct sock *sk);
246extern bool dccp_qpolicy_param_ok(struct sock *sk, __be32 param);
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250
251extern void dccp_write_xmit(struct sock *sk);
252extern void dccp_write_space(struct sock *sk);
253extern void dccp_flush_write_queue(struct sock *sk, long *time_budget);
254
255extern void dccp_init_xmit_timers(struct sock *sk);
256static inline void dccp_clear_xmit_timers(struct sock *sk)
257{
258 inet_csk_clear_xmit_timers(sk);
259}
260
261extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu);
262
263extern const char *dccp_packet_name(const int type);
264
265extern void dccp_set_state(struct sock *sk, const int state);
266extern void dccp_done(struct sock *sk);
267
268extern int dccp_reqsk_init(struct request_sock *rq, struct dccp_sock const *dp,
269 struct sk_buff const *skb);
270
271extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb);
272
273extern struct sock *dccp_create_openreq_child(struct sock *sk,
274 const struct request_sock *req,
275 const struct sk_buff *skb);
276
277extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb);
278
279extern struct sock *dccp_v4_request_recv_sock(struct sock *sk,
280 struct sk_buff *skb,
281 struct request_sock *req,
282 struct dst_entry *dst);
283extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb,
284 struct request_sock *req,
285 struct request_sock **prev);
286
287extern int dccp_child_process(struct sock *parent, struct sock *child,
288 struct sk_buff *skb);
289extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
290 struct dccp_hdr *dh, unsigned len);
291extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
292 const struct dccp_hdr *dh, const unsigned len);
293
294extern int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized);
295extern void dccp_destroy_sock(struct sock *sk);
296
297extern void dccp_close(struct sock *sk, long timeout);
298extern struct sk_buff *dccp_make_response(struct sock *sk,
299 struct dst_entry *dst,
300 struct request_sock *req);
301
302extern int dccp_connect(struct sock *sk);
303extern int dccp_disconnect(struct sock *sk, int flags);
304extern int dccp_getsockopt(struct sock *sk, int level, int optname,
305 char __user *optval, int __user *optlen);
306extern int dccp_setsockopt(struct sock *sk, int level, int optname,
307 char __user *optval, unsigned int optlen);
308#ifdef CONFIG_COMPAT
309extern int compat_dccp_getsockopt(struct sock *sk,
310 int level, int optname,
311 char __user *optval, int __user *optlen);
312extern int compat_dccp_setsockopt(struct sock *sk,
313 int level, int optname,
314 char __user *optval, unsigned int optlen);
315#endif
316extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg);
317extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk,
318 struct msghdr *msg, size_t size);
319extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk,
320 struct msghdr *msg, size_t len, int nonblock,
321 int flags, int *addr_len);
322extern void dccp_shutdown(struct sock *sk, int how);
323extern int inet_dccp_listen(struct socket *sock, int backlog);
324extern unsigned int dccp_poll(struct file *file, struct socket *sock,
325 poll_table *wait);
326extern int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr,
327 int addr_len);
328
329extern struct sk_buff *dccp_ctl_make_reset(struct sock *sk,
330 struct sk_buff *skb);
331extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code);
332extern void dccp_send_close(struct sock *sk, const int active);
333extern int dccp_invalid_packet(struct sk_buff *skb);
334extern u32 dccp_sample_rtt(struct sock *sk, long delta);
335
336static inline int dccp_bad_service_code(const struct sock *sk,
337 const __be32 service)
338{
339 const struct dccp_sock *dp = dccp_sk(sk);
340
341 if (dp->dccps_service == service)
342 return 0;
343 return !dccp_list_has_service(dp->dccps_service_list, service);
344}
345
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356
357struct dccp_skb_cb {
358 union {
359 struct inet_skb_parm h4;
360#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
361 struct inet6_skb_parm h6;
362#endif
363 } header;
364 __u8 dccpd_type:4;
365 __u8 dccpd_ccval:4;
366 __u8 dccpd_reset_code,
367 dccpd_reset_data[3];
368 __u16 dccpd_opt_len;
369 __u64 dccpd_seq;
370 __u64 dccpd_ack_seq;
371};
372
373#define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0]))
374
375
376static inline int dccp_non_data_packet(const struct sk_buff *skb)
377{
378 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
379
380 return type == DCCP_PKT_ACK ||
381 type == DCCP_PKT_CLOSE ||
382 type == DCCP_PKT_CLOSEREQ ||
383 type == DCCP_PKT_RESET ||
384 type == DCCP_PKT_SYNC ||
385 type == DCCP_PKT_SYNCACK;
386}
387
388
389static inline int dccp_data_packet(const struct sk_buff *skb)
390{
391 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
392
393 return type == DCCP_PKT_DATA ||
394 type == DCCP_PKT_DATAACK ||
395 type == DCCP_PKT_REQUEST ||
396 type == DCCP_PKT_RESPONSE;
397}
398
399static inline int dccp_packet_without_ack(const struct sk_buff *skb)
400{
401 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
402
403 return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST;
404}
405
406#define DCCP_PKT_WITHOUT_ACK_SEQ (UINT48_MAX << 2)
407
408static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss)
409{
410 struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh +
411 sizeof(*dh));
412 dh->dccph_seq2 = 0;
413 dh->dccph_seq = htons((gss >> 32) & 0xfffff);
414 dhx->dccph_seq_low = htonl(gss & 0xffffffff);
415}
416
417static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack,
418 const u64 gsr)
419{
420 dhack->dccph_reserved1 = 0;
421 dhack->dccph_ack_nr_high = htons(gsr >> 32);
422 dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff);
423}
424
425static inline void dccp_update_gsr(struct sock *sk, u64 seq)
426{
427 struct dccp_sock *dp = dccp_sk(sk);
428
429 if (after48(seq, dp->dccps_gsr))
430 dp->dccps_gsr = seq;
431
432 dp->dccps_swl = SUB48(ADD48(dp->dccps_gsr, 1), dp->dccps_r_seq_win / 4);
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448 if (before48(dp->dccps_swl, dp->dccps_isr))
449 dp->dccps_swl = dp->dccps_isr;
450 dp->dccps_swh = ADD48(dp->dccps_gsr, (3 * dp->dccps_r_seq_win) / 4);
451}
452
453static inline void dccp_update_gss(struct sock *sk, u64 seq)
454{
455 struct dccp_sock *dp = dccp_sk(sk);
456
457 dp->dccps_gss = seq;
458
459 dp->dccps_awl = SUB48(ADD48(dp->dccps_gss, 1), dp->dccps_l_seq_win);
460
461 if (before48(dp->dccps_awl, dp->dccps_iss))
462 dp->dccps_awl = dp->dccps_iss;
463 dp->dccps_awh = dp->dccps_gss;
464}
465
466static inline int dccp_ackvec_pending(const struct sock *sk)
467{
468 return dccp_sk(sk)->dccps_hc_rx_ackvec != NULL &&
469 !dccp_ackvec_is_empty(dccp_sk(sk)->dccps_hc_rx_ackvec);
470}
471
472static inline int dccp_ack_pending(const struct sock *sk)
473{
474 return dccp_ackvec_pending(sk) || inet_csk_ack_scheduled(sk);
475}
476
477extern int dccp_feat_finalise_settings(struct dccp_sock *dp);
478extern int dccp_feat_server_ccid_dependencies(struct dccp_request_sock *dreq);
479extern int dccp_feat_insert_opts(struct dccp_sock*, struct dccp_request_sock*,
480 struct sk_buff *skb);
481extern int dccp_feat_activate_values(struct sock *sk, struct list_head *fn);
482extern void dccp_feat_list_purge(struct list_head *fn_list);
483
484extern int dccp_insert_options(struct sock *sk, struct sk_buff *skb);
485extern int dccp_insert_options_rsk(struct dccp_request_sock*, struct sk_buff*);
486extern int dccp_insert_option_elapsed_time(struct sk_buff *skb, u32 elapsed);
487extern u32 dccp_timestamp(void);
488extern void dccp_timestamping_init(void);
489extern int dccp_insert_option(struct sk_buff *skb, unsigned char option,
490 const void *value, unsigned char len);
491
492#ifdef CONFIG_SYSCTL
493extern int dccp_sysctl_init(void);
494extern void dccp_sysctl_exit(void);
495#else
496static inline int dccp_sysctl_init(void)
497{
498 return 0;
499}
500
501static inline void dccp_sysctl_exit(void)
502{
503}
504#endif
505
506#endif
507