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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 | 42 | extern 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) | |
f3f3abb6 | 45 | #define dccp_debug(fmt, a...) dccp_pr_debug_cat(KERN_DEBUG fmt, ##a) |
7c657876 ACM |
46 | #else |
47 | #define dccp_pr_debug(format, a...) | |
48 | #define dccp_pr_debug_cat(format, a...) | |
f3f3abb6 | 49 | #define dccp_debug(format, a...) |
7c657876 ACM |
50 | #endif |
51 | ||
52 | extern struct inet_hashinfo dccp_hashinfo; | |
53 | ||
dd24c001 | 54 | extern struct percpu_counter dccp_orphan_count; |
7c657876 ACM |
55 | |
56 | extern void dccp_time_wait(struct sock *sk, int state, int timeo); | |
57 | ||
60361be1 GR |
58 | /* |
59 | * Set safe upper bounds for header and option length. Since Data Offset is 8 | |
60 | * bits (RFC 4340, sec. 5.1), the total header length can never be more than | |
61 | * 4 * 255 = 1020 bytes. The largest possible header length is 28 bytes (X=1): | |
62 | * - DCCP-Response with ACK Subheader and 4 bytes of Service code OR | |
63 | * - DCCP-Reset with ACK Subheader and 4 bytes of Reset Code fields | |
64 | * Hence a safe upper bound for the maximum option length is 1020-28 = 992 | |
65 | */ | |
66 | #define MAX_DCCP_SPECIFIC_HEADER (255 * sizeof(int)) | |
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) | |
7c657876 ACM |
70 | |
71 | #define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT | |
72 | * state, about 60 seconds */ | |
73 | ||
0e64e94e | 74 | /* RFC 1122, 4.2.3.1 initial RTO value */ |
7c657876 ACM |
75 | #define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ)) |
76 | ||
28be5440 GR |
77 | /* |
78 | * The maximum back-off value for retransmissions. This is needed for | |
79 | * - retransmitting client-Requests (sec. 8.1.1), | |
80 | * - retransmitting Close/CloseReq when closing (sec. 8.3), | |
81 | * - feature-negotiation retransmission (sec. 6.6.3), | |
82 | * - Acks in client-PARTOPEN state (sec. 8.1.5). | |
83 | */ | |
84 | #define DCCP_RTO_MAX ((unsigned)(64 * HZ)) | |
4712a792 | 85 | |
954c2db8 GR |
86 | /* |
87 | * RTT sampling: sanity bounds and fallback RTT value from RFC 4340, section 3.4 | |
88 | */ | |
4712a792 | 89 | #define DCCP_SANE_RTT_MIN 100 |
954c2db8 GR |
90 | #define DCCP_FALLBACK_RTT (USEC_PER_SEC / 5) |
91 | #define DCCP_SANE_RTT_MAX (3 * USEC_PER_SEC) | |
4712a792 | 92 | |
7c657876 ACM |
93 | /* Maximal interval between probes for local resources. */ |
94 | #define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U)) | |
95 | ||
2e2e9e92 GR |
96 | /* sysctl variables for DCCP */ |
97 | extern int sysctl_dccp_request_retries; | |
98 | extern int sysctl_dccp_retries1; | |
99 | extern int sysctl_dccp_retries2; | |
b1308dc0 | 100 | extern int sysctl_dccp_tx_qlen; |
a94f0f97 | 101 | extern int sysctl_dccp_sync_ratelimit; |
2e2e9e92 | 102 | |
6b811d43 GR |
103 | /* |
104 | * 48-bit sequence number arithmetic (signed and unsigned) | |
105 | */ | |
106 | #define INT48_MIN 0x800000000000LL /* 2^47 */ | |
107 | #define UINT48_MAX 0xFFFFFFFFFFFFLL /* 2^48 - 1 */ | |
108 | #define COMPLEMENT48(x) (0x1000000000000LL - (x)) /* 2^48 - 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 | ||
114 | static inline void dccp_set_seqno(u64 *seqno, u64 value) | |
115 | { | |
116 | *seqno = value & UINT48_MAX; | |
117 | } | |
118 | ||
119 | static inline void dccp_inc_seqno(u64 *seqno) | |
120 | { | |
121 | *seqno = ADD48(*seqno, 1); | |
122 | } | |
123 | ||
0aec51c8 GR |
124 | /* signed mod-2^48 distance: pos. if seqno1 < seqno2, neg. if seqno1 > seqno2 */ |
125 | static inline s64 dccp_delta_seqno(const u64 seqno1, const u64 seqno2) | |
6b811d43 | 126 | { |
0aec51c8 GR |
127 | u64 delta = SUB48(seqno2, seqno1); |
128 | ||
129 | return TO_SIGNED48(delta); | |
6b811d43 GR |
130 | } |
131 | ||
7c657876 | 132 | /* is seq1 < seq2 ? */ |
a10cedd4 | 133 | static inline int before48(const u64 seq1, const u64 seq2) |
7c657876 | 134 | { |
d52de17b | 135 | return (s64)((seq2 << 16) - (seq1 << 16)) > 0; |
7c657876 ACM |
136 | } |
137 | ||
138 | /* is seq1 > seq2 ? */ | |
d52de17b | 139 | #define after48(seq1, seq2) before48(seq2, seq1) |
7c657876 ACM |
140 | |
141 | /* is seq2 <= seq1 <= seq3 ? */ | |
a10cedd4 | 142 | static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3) |
7c657876 ACM |
143 | { |
144 | return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16); | |
145 | } | |
146 | ||
147 | static inline u64 max48(const u64 seq1, const u64 seq2) | |
148 | { | |
149 | return after48(seq1, seq2) ? seq1 : seq2; | |
150 | } | |
151 | ||
2013c7e3 GR |
152 | /** |
153 | * dccp_loss_free - Evaluates condition for data loss from RFC 4340, 7.7.1 | |
154 | * @s1: start sequence number | |
155 | * @s2: end sequence number | |
156 | * @ndp: NDP count on packet with sequence number @s2 | |
157 | * Returns true if the sequence range s1...s2 has no data loss. | |
158 | */ | |
159 | static inline bool dccp_loss_free(const u64 s1, const u64 s2, const u64 ndp) | |
160 | { | |
161 | s64 delta = dccp_delta_seqno(s1, s2); | |
162 | ||
547b792c | 163 | WARN_ON(delta < 0); |
2013c7e3 GR |
164 | return (u64)delta <= ndp + 1; |
165 | } | |
166 | ||
7c657876 ACM |
167 | enum { |
168 | DCCP_MIB_NUM = 0, | |
169 | DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */ | |
170 | DCCP_MIB_ESTABRESETS, /* EstabResets */ | |
171 | DCCP_MIB_CURRESTAB, /* CurrEstab */ | |
c9eaf173 | 172 | DCCP_MIB_OUTSEGS, /* OutSegs */ |
7c657876 ACM |
173 | DCCP_MIB_OUTRSTS, |
174 | DCCP_MIB_ABORTONTIMEOUT, | |
175 | DCCP_MIB_TIMEOUTS, | |
176 | DCCP_MIB_ABORTFAILED, | |
177 | DCCP_MIB_PASSIVEOPENS, | |
178 | DCCP_MIB_ATTEMPTFAILS, | |
179 | DCCP_MIB_OUTDATAGRAMS, | |
180 | DCCP_MIB_INERRS, | |
181 | DCCP_MIB_OPTMANDATORYERROR, | |
182 | DCCP_MIB_INVALIDOPT, | |
183 | __DCCP_MIB_MAX | |
184 | }; | |
185 | ||
186 | #define DCCP_MIB_MAX __DCCP_MIB_MAX | |
187 | struct dccp_mib { | |
188 | unsigned long mibs[DCCP_MIB_MAX]; | |
189 | } __SNMP_MIB_ALIGN__; | |
190 | ||
191 | DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics); | |
7690af3f ACM |
192 | #define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field) |
193 | #define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field) | |
194 | #define DCCP_INC_STATS_USER(field) SNMP_INC_STATS_USER(dccp_statistics, field) | |
195 | #define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field) | |
196 | #define DCCP_ADD_STATS_BH(field, val) \ | |
197 | SNMP_ADD_STATS_BH(dccp_statistics, field, val) | |
198 | #define DCCP_ADD_STATS_USER(field, val) \ | |
199 | SNMP_ADD_STATS_USER(dccp_statistics, field, val) | |
7c657876 | 200 | |
6f4e5fff GR |
201 | /* |
202 | * Checksumming routines | |
203 | */ | |
e961811f | 204 | static inline unsigned int dccp_csum_coverage(const struct sk_buff *skb) |
6f4e5fff GR |
205 | { |
206 | const struct dccp_hdr* dh = dccp_hdr(skb); | |
207 | ||
208 | if (dh->dccph_cscov == 0) | |
209 | return skb->len; | |
210 | return (dh->dccph_doff + dh->dccph_cscov - 1) * sizeof(u32); | |
211 | } | |
212 | ||
213 | static inline void dccp_csum_outgoing(struct sk_buff *skb) | |
214 | { | |
e961811f | 215 | unsigned int cov = dccp_csum_coverage(skb); |
6f4e5fff GR |
216 | |
217 | if (cov >= skb->len) | |
218 | dccp_hdr(skb)->dccph_cscov = 0; | |
219 | ||
220 | skb->csum = skb_checksum(skb, 0, (cov > skb->len)? skb->len : cov, 0); | |
221 | } | |
222 | ||
223 | extern void dccp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb); | |
224 | ||
59435444 | 225 | extern int dccp_retransmit_skb(struct sock *sk); |
7c657876 | 226 | |
7c657876 | 227 | extern void dccp_send_ack(struct sock *sk); |
6edafaaf GJ |
228 | extern void dccp_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
229 | struct request_sock *rsk); | |
8a73cd09 | 230 | |
e92ae93a ACM |
231 | extern void dccp_send_sync(struct sock *sk, const u64 seq, |
232 | const enum dccp_pkt_type pkt_type); | |
7c657876 | 233 | |
97e5848d | 234 | extern void dccp_write_xmit(struct sock *sk, int block); |
c530cfb1 | 235 | extern void dccp_write_space(struct sock *sk); |
27258ee5 | 236 | |
7c657876 ACM |
237 | extern void dccp_init_xmit_timers(struct sock *sk); |
238 | static inline void dccp_clear_xmit_timers(struct sock *sk) | |
239 | { | |
240 | inet_csk_clear_xmit_timers(sk); | |
241 | } | |
242 | ||
243 | extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu); | |
244 | ||
245 | extern const char *dccp_packet_name(const int type); | |
246 | extern const char *dccp_state_name(const int state); | |
247 | ||
c25a18ba ACM |
248 | extern void dccp_set_state(struct sock *sk, const int state); |
249 | extern void dccp_done(struct sock *sk); | |
7c657876 | 250 | |
ac75773c GR |
251 | extern int dccp_reqsk_init(struct request_sock *rq, struct dccp_sock const *dp, |
252 | struct sk_buff const *skb); | |
7c657876 | 253 | |
7c657876 ACM |
254 | extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb); |
255 | ||
256 | extern struct sock *dccp_create_openreq_child(struct sock *sk, | |
257 | const struct request_sock *req, | |
258 | const struct sk_buff *skb); | |
259 | ||
260 | extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb); | |
261 | ||
7c657876 ACM |
262 | extern struct sock *dccp_v4_request_recv_sock(struct sock *sk, |
263 | struct sk_buff *skb, | |
264 | struct request_sock *req, | |
265 | struct dst_entry *dst); | |
266 | extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb, | |
267 | struct request_sock *req, | |
268 | struct request_sock **prev); | |
269 | ||
270 | extern int dccp_child_process(struct sock *parent, struct sock *child, | |
271 | struct sk_buff *skb); | |
272 | extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb, | |
273 | struct dccp_hdr *dh, unsigned len); | |
274 | extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb, | |
275 | const struct dccp_hdr *dh, const unsigned len); | |
276 | ||
72478873 | 277 | extern int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized); |
7d06b2e0 | 278 | extern void dccp_destroy_sock(struct sock *sk); |
f21e68ca | 279 | |
7c657876 ACM |
280 | extern void dccp_close(struct sock *sk, long timeout); |
281 | extern struct sk_buff *dccp_make_response(struct sock *sk, | |
282 | struct dst_entry *dst, | |
283 | struct request_sock *req); | |
284 | ||
285 | extern int dccp_connect(struct sock *sk); | |
286 | extern int dccp_disconnect(struct sock *sk, int flags); | |
287 | extern int dccp_getsockopt(struct sock *sk, int level, int optname, | |
a1d3a355 ACM |
288 | char __user *optval, int __user *optlen); |
289 | extern int dccp_setsockopt(struct sock *sk, int level, int optname, | |
290 | char __user *optval, int optlen); | |
3fdadf7d DM |
291 | #ifdef CONFIG_COMPAT |
292 | extern int compat_dccp_getsockopt(struct sock *sk, | |
293 | int level, int optname, | |
294 | char __user *optval, int __user *optlen); | |
295 | extern int compat_dccp_setsockopt(struct sock *sk, | |
296 | int level, int optname, | |
297 | char __user *optval, int optlen); | |
298 | #endif | |
7c657876 | 299 | extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg); |
7690af3f ACM |
300 | extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, |
301 | struct msghdr *msg, size_t size); | |
7c657876 ACM |
302 | extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, |
303 | struct msghdr *msg, size_t len, int nonblock, | |
304 | int flags, int *addr_len); | |
7c657876 | 305 | extern void dccp_shutdown(struct sock *sk, int how); |
f21e68ca ACM |
306 | extern int inet_dccp_listen(struct socket *sock, int backlog); |
307 | extern unsigned int dccp_poll(struct file *file, struct socket *sock, | |
308 | poll_table *wait); | |
f21e68ca ACM |
309 | extern int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, |
310 | int addr_len); | |
7c657876 | 311 | |
7630f026 | 312 | extern struct sk_buff *dccp_ctl_make_reset(struct sock *sk, |
e356d37a | 313 | struct sk_buff *skb); |
017487d7 | 314 | extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code); |
7ad07e7c | 315 | extern void dccp_send_close(struct sock *sk, const int active); |
f21e68ca | 316 | extern int dccp_invalid_packet(struct sk_buff *skb); |
3393da82 | 317 | extern u32 dccp_sample_rtt(struct sock *sk, long delta); |
f21e68ca ACM |
318 | |
319 | static inline int dccp_bad_service_code(const struct sock *sk, | |
60fe62e7 | 320 | const __be32 service) |
f21e68ca ACM |
321 | { |
322 | const struct dccp_sock *dp = dccp_sk(sk); | |
323 | ||
324 | if (dp->dccps_service == service) | |
325 | return 0; | |
326 | return !dccp_list_has_service(dp->dccps_service_list, service); | |
327 | } | |
7c657876 | 328 | |
0430ee34 GR |
329 | /** |
330 | * dccp_skb_cb - DCCP per-packet control information | |
331 | * @dccpd_type: one of %dccp_pkt_type (or unknown) | |
332 | * @dccpd_ccval: CCVal field (5.1), see e.g. RFC 4342, 8.1 | |
333 | * @dccpd_reset_code: one of %dccp_reset_codes | |
334 | * @dccpd_reset_data: Data1..3 fields (depend on @dccpd_reset_code) | |
335 | * @dccpd_opt_len: total length of all options (5.8) in the packet | |
336 | * @dccpd_seq: sequence number | |
337 | * @dccpd_ack_seq: acknowledgment number subheader field value | |
338 | * This is used for transmission as well as for reception. | |
339 | */ | |
7c657876 | 340 | struct dccp_skb_cb { |
028b0275 PM |
341 | union { |
342 | struct inet_skb_parm h4; | |
343 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) | |
344 | struct inet6_skb_parm h6; | |
345 | #endif | |
346 | } header; | |
67e6b629 ACM |
347 | __u8 dccpd_type:4; |
348 | __u8 dccpd_ccval:4; | |
0430ee34 GR |
349 | __u8 dccpd_reset_code, |
350 | dccpd_reset_data[3]; | |
67e6b629 | 351 | __u16 dccpd_opt_len; |
7c657876 ACM |
352 | __u64 dccpd_seq; |
353 | __u64 dccpd_ack_seq; | |
7c657876 ACM |
354 | }; |
355 | ||
356 | #define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0])) | |
357 | ||
2180c41c | 358 | /* RFC 4340, sec. 7.7 */ |
7c657876 ACM |
359 | static inline int dccp_non_data_packet(const struct sk_buff *skb) |
360 | { | |
361 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; | |
362 | ||
363 | return type == DCCP_PKT_ACK || | |
364 | type == DCCP_PKT_CLOSE || | |
365 | type == DCCP_PKT_CLOSEREQ || | |
366 | type == DCCP_PKT_RESET || | |
367 | type == DCCP_PKT_SYNC || | |
368 | type == DCCP_PKT_SYNCACK; | |
369 | } | |
370 | ||
2180c41c GR |
371 | /* RFC 4340, sec. 7.7 */ |
372 | static inline int dccp_data_packet(const struct sk_buff *skb) | |
373 | { | |
374 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; | |
375 | ||
376 | return type == DCCP_PKT_DATA || | |
377 | type == DCCP_PKT_DATAACK || | |
378 | type == DCCP_PKT_REQUEST || | |
379 | type == DCCP_PKT_RESPONSE; | |
380 | } | |
381 | ||
7c657876 ACM |
382 | static inline int dccp_packet_without_ack(const struct sk_buff *skb) |
383 | { | |
384 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; | |
385 | ||
386 | return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST; | |
387 | } | |
388 | ||
6b811d43 | 389 | #define DCCP_PKT_WITHOUT_ACK_SEQ (UINT48_MAX << 2) |
7c657876 ACM |
390 | |
391 | static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss) | |
392 | { | |
7690af3f ACM |
393 | struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh + |
394 | sizeof(*dh)); | |
60fe62e7 AB |
395 | dh->dccph_seq2 = 0; |
396 | dh->dccph_seq = htons((gss >> 32) & 0xfffff); | |
7c657876 ACM |
397 | dhx->dccph_seq_low = htonl(gss & 0xffffffff); |
398 | } | |
399 | ||
7690af3f ACM |
400 | static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack, |
401 | const u64 gsr) | |
7c657876 | 402 | { |
60fe62e7 AB |
403 | dhack->dccph_reserved1 = 0; |
404 | dhack->dccph_ack_nr_high = htons(gsr >> 32); | |
7c657876 ACM |
405 | dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff); |
406 | } | |
407 | ||
408 | static inline void dccp_update_gsr(struct sock *sk, u64 seq) | |
409 | { | |
410 | struct dccp_sock *dp = dccp_sk(sk); | |
7c657876 | 411 | |
03ace394 | 412 | dp->dccps_gsr = seq; |
792b4878 GR |
413 | /* Sequence validity window depends on remote Sequence Window (7.5.1) */ |
414 | dp->dccps_swl = SUB48(ADD48(dp->dccps_gsr, 1), dp->dccps_r_seq_win / 4); | |
415 | dp->dccps_swh = ADD48(dp->dccps_gsr, (3 * dp->dccps_r_seq_win) / 4); | |
7c657876 ACM |
416 | } |
417 | ||
418 | static inline void dccp_update_gss(struct sock *sk, u64 seq) | |
419 | { | |
420 | struct dccp_sock *dp = dccp_sk(sk); | |
7c657876 | 421 | |
792b4878 GR |
422 | dp->dccps_gss = seq; |
423 | /* Ack validity window depends on local Sequence Window value (7.5.1) */ | |
424 | dp->dccps_awl = SUB48(ADD48(dp->dccps_gss, 1), dp->dccps_l_seq_win); | |
425 | dp->dccps_awh = dp->dccps_gss; | |
7c657876 | 426 | } |
c9eaf173 | 427 | |
ae31c339 ACM |
428 | static inline int dccp_ack_pending(const struct sock *sk) |
429 | { | |
430 | const struct dccp_sock *dp = dccp_sk(sk); | |
431 | return dp->dccps_timestamp_echo != 0 || | |
6fdd34d4 | 432 | (dp->dccps_hc_rx_ackvec != NULL && |
ae31c339 | 433 | dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) || |
ae31c339 ACM |
434 | inet_csk_ack_scheduled(sk); |
435 | } | |
7c657876 | 436 | |
9eca0a47 | 437 | extern int dccp_feat_finalise_settings(struct dccp_sock *dp); |
0c116839 | 438 | extern int dccp_feat_server_ccid_dependencies(struct dccp_request_sock *dreq); |
0971d17c GR |
439 | extern int dccp_feat_insert_opts(struct dccp_sock*, struct dccp_request_sock*, |
440 | struct sk_buff *skb); | |
422d9cdc | 441 | extern int dccp_feat_activate_values(struct sock *sk, struct list_head *fn); |
61e6473e GR |
442 | extern void dccp_feat_list_purge(struct list_head *fn_list); |
443 | ||
2d0817d1 | 444 | extern int dccp_insert_options(struct sock *sk, struct sk_buff *skb); |
af3b867e | 445 | extern int dccp_insert_options_rsk(struct dccp_request_sock*, struct sk_buff*); |
2d0817d1 | 446 | extern int dccp_insert_option_elapsed_time(struct sock *sk, |
7c657876 ACM |
447 | struct sk_buff *skb, |
448 | u32 elapsed_time); | |
4c70f383 GR |
449 | extern u32 dccp_timestamp(void); |
450 | extern void dccp_timestamping_init(void); | |
2d0817d1 | 451 | extern int dccp_insert_option_timestamp(struct sock *sk, |
d4b81ff7 | 452 | struct sk_buff *skb); |
2d0817d1 | 453 | extern int dccp_insert_option(struct sock *sk, struct sk_buff *skb, |
7c657876 ACM |
454 | unsigned char option, |
455 | const void *value, unsigned char len); | |
456 | ||
e55d912f ACM |
457 | #ifdef CONFIG_SYSCTL |
458 | extern int dccp_sysctl_init(void); | |
459 | extern void dccp_sysctl_exit(void); | |
460 | #else | |
461 | static inline int dccp_sysctl_init(void) | |
462 | { | |
463 | return 0; | |
464 | } | |
465 | ||
466 | static inline void dccp_sysctl_exit(void) | |
467 | { | |
468 | } | |
469 | #endif | |
470 | ||
7c657876 | 471 | #endif /* _DCCP_H */ |