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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> | |
16 | #include <net/snmp.h> | |
17 | #include <net/sock.h> | |
18 | #include <net/tcp.h> | |
ae31c339 | 19 | #include "ackvec.h" |
7c657876 | 20 | |
59348b19 GR |
21 | /* |
22 | * DCCP - specific warning and debugging macros. | |
23 | */ | |
24 | #define DCCP_WARN(fmt, a...) LIMIT_NETDEBUG(KERN_WARNING "%s: " fmt, \ | |
c9eaf173 | 25 | __FUNCTION__, ##a) |
59348b19 GR |
26 | #define DCCP_CRIT(fmt, a...) printk(KERN_CRIT fmt " at %s:%d/%s()\n", ##a, \ |
27 | __FILE__, __LINE__, __FUNCTION__) | |
28 | #define DCCP_BUG(a...) do { DCCP_CRIT("BUG: " a); dump_stack(); } while(0) | |
29 | #define DCCP_BUG_ON(cond) do { if (unlikely((cond) != 0)) \ | |
30 | DCCP_BUG("\"%s\" holds (exception!)", \ | |
31 | __stringify(cond)); \ | |
3c695262 GR |
32 | } while (0) |
33 | ||
84116716 GR |
34 | #define DCCP_PRINTK(enable, fmt, args...) do { if (enable) \ |
35 | printk(fmt, ##args); \ | |
c9eaf173 | 36 | } while(0) |
84116716 GR |
37 | #define DCCP_PR_DEBUG(enable, fmt, a...) DCCP_PRINTK(enable, KERN_DEBUG \ |
38 | "%s: " fmt, __FUNCTION__, ##a) | |
39 | ||
725ba8ee | 40 | #ifdef CONFIG_IP_DCCP_DEBUG |
7c657876 | 41 | extern int dccp_debug; |
84116716 GR |
42 | #define dccp_pr_debug(format, a...) DCCP_PR_DEBUG(dccp_debug, format, ##a) |
43 | #define dccp_pr_debug_cat(format, a...) DCCP_PRINTK(dccp_debug, format, ##a) | |
7c657876 ACM |
44 | #else |
45 | #define dccp_pr_debug(format, a...) | |
46 | #define dccp_pr_debug_cat(format, a...) | |
47 | #endif | |
48 | ||
49 | extern struct inet_hashinfo dccp_hashinfo; | |
50 | ||
51 | extern atomic_t dccp_orphan_count; | |
7c657876 ACM |
52 | |
53 | extern void dccp_time_wait(struct sock *sk, int state, int timeo); | |
54 | ||
60361be1 GR |
55 | /* |
56 | * Set safe upper bounds for header and option length. Since Data Offset is 8 | |
57 | * bits (RFC 4340, sec. 5.1), the total header length can never be more than | |
58 | * 4 * 255 = 1020 bytes. The largest possible header length is 28 bytes (X=1): | |
59 | * - DCCP-Response with ACK Subheader and 4 bytes of Service code OR | |
60 | * - DCCP-Reset with ACK Subheader and 4 bytes of Reset Code fields | |
61 | * Hence a safe upper bound for the maximum option length is 1020-28 = 992 | |
62 | */ | |
63 | #define MAX_DCCP_SPECIFIC_HEADER (255 * sizeof(int)) | |
64 | #define DCCP_MAX_PACKET_HDR 28 | |
65 | #define DCCP_MAX_OPT_LEN (MAX_DCCP_SPECIFIC_HEADER - DCCP_MAX_PACKET_HDR) | |
66 | #define MAX_DCCP_HEADER (MAX_DCCP_SPECIFIC_HEADER + MAX_HEADER) | |
7c657876 ACM |
67 | |
68 | #define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT | |
69 | * state, about 60 seconds */ | |
70 | ||
0e64e94e | 71 | /* RFC 1122, 4.2.3.1 initial RTO value */ |
7c657876 ACM |
72 | #define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ)) |
73 | ||
4712a792 GR |
74 | #define DCCP_RTO_MAX ((unsigned)(120 * HZ)) /* FIXME: using TCP value */ |
75 | ||
76 | /* bounds for sampled RTT values from packet exchanges (in usec) */ | |
77 | #define DCCP_SANE_RTT_MIN 100 | |
78 | #define DCCP_SANE_RTT_MAX (4 * USEC_PER_SEC) | |
79 | ||
7c657876 ACM |
80 | /* Maximal interval between probes for local resources. */ |
81 | #define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U)) | |
82 | ||
2e2e9e92 GR |
83 | /* sysctl variables for DCCP */ |
84 | extern int sysctl_dccp_request_retries; | |
85 | extern int sysctl_dccp_retries1; | |
86 | extern int sysctl_dccp_retries2; | |
afb0a34d GR |
87 | extern int sysctl_dccp_feat_sequence_window; |
88 | extern int sysctl_dccp_feat_rx_ccid; | |
89 | extern int sysctl_dccp_feat_tx_ccid; | |
90 | extern int sysctl_dccp_feat_ack_ratio; | |
91 | extern int sysctl_dccp_feat_send_ack_vector; | |
92 | extern int sysctl_dccp_feat_send_ndp_count; | |
b1308dc0 | 93 | extern int sysctl_dccp_tx_qlen; |
2e2e9e92 | 94 | |
6b811d43 GR |
95 | /* |
96 | * 48-bit sequence number arithmetic (signed and unsigned) | |
97 | */ | |
98 | #define INT48_MIN 0x800000000000LL /* 2^47 */ | |
99 | #define UINT48_MAX 0xFFFFFFFFFFFFLL /* 2^48 - 1 */ | |
100 | #define COMPLEMENT48(x) (0x1000000000000LL - (x)) /* 2^48 - x */ | |
101 | #define TO_SIGNED48(x) (((x) < INT48_MIN)? (x) : -COMPLEMENT48( (x))) | |
102 | #define TO_UNSIGNED48(x) (((x) >= 0)? (x) : COMPLEMENT48(-(x))) | |
103 | #define ADD48(a, b) (((a) + (b)) & UINT48_MAX) | |
104 | #define SUB48(a, b) ADD48((a), COMPLEMENT48(b)) | |
105 | ||
106 | static inline void dccp_set_seqno(u64 *seqno, u64 value) | |
107 | { | |
108 | *seqno = value & UINT48_MAX; | |
109 | } | |
110 | ||
111 | static inline void dccp_inc_seqno(u64 *seqno) | |
112 | { | |
113 | *seqno = ADD48(*seqno, 1); | |
114 | } | |
115 | ||
0aec51c8 GR |
116 | /* signed mod-2^48 distance: pos. if seqno1 < seqno2, neg. if seqno1 > seqno2 */ |
117 | static inline s64 dccp_delta_seqno(const u64 seqno1, const u64 seqno2) | |
6b811d43 | 118 | { |
0aec51c8 GR |
119 | u64 delta = SUB48(seqno2, seqno1); |
120 | ||
121 | return TO_SIGNED48(delta); | |
6b811d43 GR |
122 | } |
123 | ||
7c657876 | 124 | /* is seq1 < seq2 ? */ |
a10cedd4 | 125 | static inline int before48(const u64 seq1, const u64 seq2) |
7c657876 | 126 | { |
d52de17b | 127 | return (s64)((seq2 << 16) - (seq1 << 16)) > 0; |
7c657876 ACM |
128 | } |
129 | ||
130 | /* is seq1 > seq2 ? */ | |
d52de17b | 131 | #define after48(seq1, seq2) before48(seq2, seq1) |
7c657876 ACM |
132 | |
133 | /* is seq2 <= seq1 <= seq3 ? */ | |
a10cedd4 | 134 | static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3) |
7c657876 ACM |
135 | { |
136 | return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16); | |
137 | } | |
138 | ||
139 | static inline u64 max48(const u64 seq1, const u64 seq2) | |
140 | { | |
141 | return after48(seq1, seq2) ? seq1 : seq2; | |
142 | } | |
143 | ||
837d107c IM |
144 | /* is seq1 next seqno after seq2 */ |
145 | static inline int follows48(const u64 seq1, const u64 seq2) | |
146 | { | |
b16be51b | 147 | return dccp_delta_seqno(seq2, seq1) == 1; |
837d107c IM |
148 | } |
149 | ||
7c657876 ACM |
150 | enum { |
151 | DCCP_MIB_NUM = 0, | |
152 | DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */ | |
153 | DCCP_MIB_ESTABRESETS, /* EstabResets */ | |
154 | DCCP_MIB_CURRESTAB, /* CurrEstab */ | |
c9eaf173 | 155 | DCCP_MIB_OUTSEGS, /* OutSegs */ |
7c657876 ACM |
156 | DCCP_MIB_OUTRSTS, |
157 | DCCP_MIB_ABORTONTIMEOUT, | |
158 | DCCP_MIB_TIMEOUTS, | |
159 | DCCP_MIB_ABORTFAILED, | |
160 | DCCP_MIB_PASSIVEOPENS, | |
161 | DCCP_MIB_ATTEMPTFAILS, | |
162 | DCCP_MIB_OUTDATAGRAMS, | |
163 | DCCP_MIB_INERRS, | |
164 | DCCP_MIB_OPTMANDATORYERROR, | |
165 | DCCP_MIB_INVALIDOPT, | |
166 | __DCCP_MIB_MAX | |
167 | }; | |
168 | ||
169 | #define DCCP_MIB_MAX __DCCP_MIB_MAX | |
170 | struct dccp_mib { | |
171 | unsigned long mibs[DCCP_MIB_MAX]; | |
172 | } __SNMP_MIB_ALIGN__; | |
173 | ||
174 | DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics); | |
7690af3f ACM |
175 | #define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field) |
176 | #define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field) | |
177 | #define DCCP_INC_STATS_USER(field) SNMP_INC_STATS_USER(dccp_statistics, field) | |
178 | #define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field) | |
179 | #define DCCP_ADD_STATS_BH(field, val) \ | |
180 | SNMP_ADD_STATS_BH(dccp_statistics, field, val) | |
181 | #define DCCP_ADD_STATS_USER(field, val) \ | |
182 | SNMP_ADD_STATS_USER(dccp_statistics, field, val) | |
7c657876 | 183 | |
6f4e5fff GR |
184 | /* |
185 | * Checksumming routines | |
186 | */ | |
e961811f | 187 | static inline unsigned int dccp_csum_coverage(const struct sk_buff *skb) |
6f4e5fff GR |
188 | { |
189 | const struct dccp_hdr* dh = dccp_hdr(skb); | |
190 | ||
191 | if (dh->dccph_cscov == 0) | |
192 | return skb->len; | |
193 | return (dh->dccph_doff + dh->dccph_cscov - 1) * sizeof(u32); | |
194 | } | |
195 | ||
196 | static inline void dccp_csum_outgoing(struct sk_buff *skb) | |
197 | { | |
e961811f | 198 | unsigned int cov = dccp_csum_coverage(skb); |
6f4e5fff GR |
199 | |
200 | if (cov >= skb->len) | |
201 | dccp_hdr(skb)->dccph_cscov = 0; | |
202 | ||
203 | skb->csum = skb_checksum(skb, 0, (cov > skb->len)? skb->len : cov, 0); | |
204 | } | |
205 | ||
206 | extern void dccp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb); | |
207 | ||
7c657876 ACM |
208 | extern int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb); |
209 | ||
7c657876 ACM |
210 | extern void dccp_send_ack(struct sock *sk); |
211 | extern void dccp_send_delayed_ack(struct sock *sk); | |
8a73cd09 GR |
212 | extern void dccp_reqsk_send_ack(struct sk_buff *sk, struct request_sock *rsk); |
213 | ||
e92ae93a ACM |
214 | extern void dccp_send_sync(struct sock *sk, const u64 seq, |
215 | const enum dccp_pkt_type pkt_type); | |
7c657876 | 216 | |
97e5848d | 217 | extern void dccp_write_xmit(struct sock *sk, int block); |
c530cfb1 | 218 | extern void dccp_write_space(struct sock *sk); |
27258ee5 | 219 | |
7c657876 ACM |
220 | extern void dccp_init_xmit_timers(struct sock *sk); |
221 | static inline void dccp_clear_xmit_timers(struct sock *sk) | |
222 | { | |
223 | inet_csk_clear_xmit_timers(sk); | |
224 | } | |
225 | ||
226 | extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu); | |
227 | ||
228 | extern const char *dccp_packet_name(const int type); | |
229 | extern const char *dccp_state_name(const int state); | |
230 | ||
c25a18ba ACM |
231 | extern void dccp_set_state(struct sock *sk, const int state); |
232 | extern void dccp_done(struct sock *sk); | |
7c657876 | 233 | |
cf557926 | 234 | extern void dccp_reqsk_init(struct request_sock *req, struct sk_buff *skb); |
7c657876 | 235 | |
7c657876 ACM |
236 | extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb); |
237 | ||
238 | extern struct sock *dccp_create_openreq_child(struct sock *sk, | |
239 | const struct request_sock *req, | |
240 | const struct sk_buff *skb); | |
241 | ||
242 | extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb); | |
243 | ||
7c657876 ACM |
244 | extern struct sock *dccp_v4_request_recv_sock(struct sock *sk, |
245 | struct sk_buff *skb, | |
246 | struct request_sock *req, | |
247 | struct dst_entry *dst); | |
248 | extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb, | |
249 | struct request_sock *req, | |
250 | struct request_sock **prev); | |
251 | ||
252 | extern int dccp_child_process(struct sock *parent, struct sock *child, | |
253 | struct sk_buff *skb); | |
254 | extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb, | |
255 | struct dccp_hdr *dh, unsigned len); | |
256 | extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb, | |
257 | const struct dccp_hdr *dh, const unsigned len); | |
258 | ||
72478873 | 259 | extern int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized); |
3e0fadc5 | 260 | extern int dccp_destroy_sock(struct sock *sk); |
f21e68ca | 261 | |
7c657876 ACM |
262 | extern void dccp_close(struct sock *sk, long timeout); |
263 | extern struct sk_buff *dccp_make_response(struct sock *sk, | |
264 | struct dst_entry *dst, | |
265 | struct request_sock *req); | |
266 | ||
267 | extern int dccp_connect(struct sock *sk); | |
268 | extern int dccp_disconnect(struct sock *sk, int flags); | |
c985ed70 | 269 | extern void dccp_hash(struct sock *sk); |
f21e68ca | 270 | extern void dccp_unhash(struct sock *sk); |
7c657876 | 271 | extern int dccp_getsockopt(struct sock *sk, int level, int optname, |
a1d3a355 ACM |
272 | char __user *optval, int __user *optlen); |
273 | extern int dccp_setsockopt(struct sock *sk, int level, int optname, | |
274 | char __user *optval, int optlen); | |
3fdadf7d DM |
275 | #ifdef CONFIG_COMPAT |
276 | extern int compat_dccp_getsockopt(struct sock *sk, | |
277 | int level, int optname, | |
278 | char __user *optval, int __user *optlen); | |
279 | extern int compat_dccp_setsockopt(struct sock *sk, | |
280 | int level, int optname, | |
281 | char __user *optval, int optlen); | |
282 | #endif | |
7c657876 | 283 | extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg); |
7690af3f ACM |
284 | extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, |
285 | struct msghdr *msg, size_t size); | |
7c657876 ACM |
286 | extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, |
287 | struct msghdr *msg, size_t len, int nonblock, | |
288 | int flags, int *addr_len); | |
7c657876 | 289 | extern void dccp_shutdown(struct sock *sk, int how); |
f21e68ca ACM |
290 | extern int inet_dccp_listen(struct socket *sock, int backlog); |
291 | extern unsigned int dccp_poll(struct file *file, struct socket *sock, | |
292 | poll_table *wait); | |
f21e68ca ACM |
293 | extern int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, |
294 | int addr_len); | |
7c657876 | 295 | |
017487d7 | 296 | extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code); |
7ad07e7c | 297 | extern void dccp_send_close(struct sock *sk, const int active); |
f21e68ca | 298 | extern int dccp_invalid_packet(struct sk_buff *skb); |
4712a792 GR |
299 | extern u32 dccp_sample_rtt(struct sock *sk, struct timeval *t_recv, |
300 | struct timeval *t_history); | |
f21e68ca ACM |
301 | |
302 | static inline int dccp_bad_service_code(const struct sock *sk, | |
60fe62e7 | 303 | const __be32 service) |
f21e68ca ACM |
304 | { |
305 | const struct dccp_sock *dp = dccp_sk(sk); | |
306 | ||
307 | if (dp->dccps_service == service) | |
308 | return 0; | |
309 | return !dccp_list_has_service(dp->dccps_service_list, service); | |
310 | } | |
7c657876 ACM |
311 | |
312 | struct dccp_skb_cb { | |
67e6b629 ACM |
313 | __u8 dccpd_type:4; |
314 | __u8 dccpd_ccval:4; | |
315 | __u8 dccpd_reset_code; | |
316 | __u16 dccpd_opt_len; | |
7c657876 ACM |
317 | __u64 dccpd_seq; |
318 | __u64 dccpd_ack_seq; | |
7c657876 ACM |
319 | }; |
320 | ||
321 | #define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0])) | |
322 | ||
323 | static inline int dccp_non_data_packet(const struct sk_buff *skb) | |
324 | { | |
325 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; | |
326 | ||
327 | return type == DCCP_PKT_ACK || | |
328 | type == DCCP_PKT_CLOSE || | |
329 | type == DCCP_PKT_CLOSEREQ || | |
330 | type == DCCP_PKT_RESET || | |
331 | type == DCCP_PKT_SYNC || | |
332 | type == DCCP_PKT_SYNCACK; | |
333 | } | |
334 | ||
335 | static inline int dccp_packet_without_ack(const struct sk_buff *skb) | |
336 | { | |
337 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; | |
338 | ||
339 | return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST; | |
340 | } | |
341 | ||
6b811d43 | 342 | #define DCCP_PKT_WITHOUT_ACK_SEQ (UINT48_MAX << 2) |
7c657876 ACM |
343 | |
344 | static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss) | |
345 | { | |
7690af3f ACM |
346 | struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh + |
347 | sizeof(*dh)); | |
60fe62e7 AB |
348 | dh->dccph_seq2 = 0; |
349 | dh->dccph_seq = htons((gss >> 32) & 0xfffff); | |
7c657876 ACM |
350 | dhx->dccph_seq_low = htonl(gss & 0xffffffff); |
351 | } | |
352 | ||
7690af3f ACM |
353 | static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack, |
354 | const u64 gsr) | |
7c657876 | 355 | { |
60fe62e7 AB |
356 | dhack->dccph_reserved1 = 0; |
357 | dhack->dccph_ack_nr_high = htons(gsr >> 32); | |
7c657876 ACM |
358 | dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff); |
359 | } | |
360 | ||
361 | static inline void dccp_update_gsr(struct sock *sk, u64 seq) | |
362 | { | |
363 | struct dccp_sock *dp = dccp_sk(sk); | |
a4bf3902 | 364 | const struct dccp_minisock *dmsk = dccp_msk(sk); |
7c657876 | 365 | |
03ace394 ACM |
366 | dp->dccps_gsr = seq; |
367 | dccp_set_seqno(&dp->dccps_swl, | |
a4bf3902 | 368 | dp->dccps_gsr + 1 - (dmsk->dccpms_sequence_window / 4)); |
7c657876 | 369 | dccp_set_seqno(&dp->dccps_swh, |
a4bf3902 | 370 | dp->dccps_gsr + (3 * dmsk->dccpms_sequence_window) / 4); |
7c657876 ACM |
371 | } |
372 | ||
373 | static inline void dccp_update_gss(struct sock *sk, u64 seq) | |
374 | { | |
375 | struct dccp_sock *dp = dccp_sk(sk); | |
7c657876 | 376 | |
03ace394 ACM |
377 | dp->dccps_awh = dp->dccps_gss = seq; |
378 | dccp_set_seqno(&dp->dccps_awl, | |
7690af3f | 379 | (dp->dccps_gss - |
a4bf3902 | 380 | dccp_msk(sk)->dccpms_sequence_window + 1)); |
7c657876 | 381 | } |
c9eaf173 | 382 | |
ae31c339 ACM |
383 | static inline int dccp_ack_pending(const struct sock *sk) |
384 | { | |
385 | const struct dccp_sock *dp = dccp_sk(sk); | |
386 | return dp->dccps_timestamp_echo != 0 || | |
387 | #ifdef CONFIG_IP_DCCP_ACKVEC | |
a4bf3902 | 388 | (dccp_msk(sk)->dccpms_send_ack_vector && |
ae31c339 ACM |
389 | dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) || |
390 | #endif | |
391 | inet_csk_ack_scheduled(sk); | |
392 | } | |
7c657876 | 393 | |
2d0817d1 ACM |
394 | extern int dccp_insert_options(struct sock *sk, struct sk_buff *skb); |
395 | extern int dccp_insert_option_elapsed_time(struct sock *sk, | |
7c657876 ACM |
396 | struct sk_buff *skb, |
397 | u32 elapsed_time); | |
2d0817d1 | 398 | extern int dccp_insert_option_timestamp(struct sock *sk, |
d4b81ff7 | 399 | struct sk_buff *skb); |
2d0817d1 | 400 | extern int dccp_insert_option(struct sock *sk, struct sk_buff *skb, |
7c657876 ACM |
401 | unsigned char option, |
402 | const void *value, unsigned char len); | |
403 | ||
b0e56780 ACM |
404 | extern void dccp_timestamp(const struct sock *sk, struct timeval *tv); |
405 | ||
b6ee3d4a ACM |
406 | static inline suseconds_t timeval_usecs(const struct timeval *tv) |
407 | { | |
408 | return tv->tv_sec * USEC_PER_SEC + tv->tv_usec; | |
409 | } | |
410 | ||
411 | static inline suseconds_t timeval_delta(const struct timeval *large, | |
412 | const struct timeval *small) | |
413 | { | |
414 | time_t secs = large->tv_sec - small->tv_sec; | |
415 | suseconds_t usecs = large->tv_usec - small->tv_usec; | |
416 | ||
417 | if (usecs < 0) { | |
418 | secs--; | |
419 | usecs += USEC_PER_SEC; | |
420 | } | |
421 | return secs * USEC_PER_SEC + usecs; | |
422 | } | |
423 | ||
424 | static inline void timeval_add_usecs(struct timeval *tv, | |
425 | const suseconds_t usecs) | |
426 | { | |
427 | tv->tv_usec += usecs; | |
428 | while (tv->tv_usec >= USEC_PER_SEC) { | |
429 | tv->tv_sec++; | |
430 | tv->tv_usec -= USEC_PER_SEC; | |
431 | } | |
432 | } | |
433 | ||
434 | static inline void timeval_sub_usecs(struct timeval *tv, | |
435 | const suseconds_t usecs) | |
436 | { | |
437 | tv->tv_usec -= usecs; | |
438 | while (tv->tv_usec < 0) { | |
439 | tv->tv_sec--; | |
440 | tv->tv_usec += USEC_PER_SEC; | |
441 | } | |
0f9e5b57 | 442 | DCCP_BUG_ON(tv->tv_sec < 0); |
b6ee3d4a ACM |
443 | } |
444 | ||
e55d912f ACM |
445 | #ifdef CONFIG_SYSCTL |
446 | extern int dccp_sysctl_init(void); | |
447 | extern void dccp_sysctl_exit(void); | |
448 | #else | |
449 | static inline int dccp_sysctl_init(void) | |
450 | { | |
451 | return 0; | |
452 | } | |
453 | ||
454 | static inline void dccp_sysctl_exit(void) | |
455 | { | |
456 | } | |
457 | #endif | |
458 | ||
7c657876 | 459 | #endif /* _DCCP_H */ |