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1 | /* SPDX-License-Identifier: GPL-2.0-only */ | |
2 | #ifndef _DCCP_H | |
3 | #define _DCCP_H | |
4 | /* | |
5 | * net/dccp/dccp.h | |
6 | * | |
7 | * An implementation of the DCCP protocol | |
8 | * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br> | |
9 | * Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.nz> | |
10 | */ | |
11 | ||
12 | #include <linux/dccp.h> | |
13 | #include <linux/ktime.h> | |
14 | #include <net/snmp.h> | |
15 | #include <net/sock.h> | |
16 | #include <net/tcp.h> | |
17 | #include "ackvec.h" | |
18 | ||
19 | /* | |
20 | * DCCP - specific warning and debugging macros. | |
21 | */ | |
22 | #define DCCP_WARN(fmt, ...) \ | |
23 | net_warn_ratelimited("%s: " fmt, __func__, ##__VA_ARGS__) | |
24 | #define DCCP_CRIT(fmt, a...) printk(KERN_CRIT fmt " at %s:%d/%s()\n", ##a, \ | |
25 | __FILE__, __LINE__, __func__) | |
26 | #define DCCP_BUG(a...) do { DCCP_CRIT("BUG: " a); dump_stack(); } while(0) | |
27 | #define DCCP_BUG_ON(cond) do { if (unlikely((cond) != 0)) \ | |
28 | DCCP_BUG("\"%s\" holds (exception!)", \ | |
29 | __stringify(cond)); \ | |
30 | } while (0) | |
31 | ||
32 | #define DCCP_PRINTK(enable, fmt, args...) do { if (enable) \ | |
33 | printk(fmt, ##args); \ | |
34 | } while(0) | |
35 | #define DCCP_PR_DEBUG(enable, fmt, a...) DCCP_PRINTK(enable, KERN_DEBUG \ | |
36 | "%s: " fmt, __func__, ##a) | |
37 | ||
38 | #ifdef CONFIG_IP_DCCP_DEBUG | |
39 | extern bool dccp_debug; | |
40 | #define dccp_pr_debug(format, a...) DCCP_PR_DEBUG(dccp_debug, format, ##a) | |
41 | #define dccp_pr_debug_cat(format, a...) DCCP_PRINTK(dccp_debug, format, ##a) | |
42 | #define dccp_debug(fmt, a...) dccp_pr_debug_cat(KERN_DEBUG fmt, ##a) | |
43 | #else | |
44 | #define dccp_pr_debug(format, a...) do {} while (0) | |
45 | #define dccp_pr_debug_cat(format, a...) do {} while (0) | |
46 | #define dccp_debug(format, a...) do {} while (0) | |
47 | #endif | |
48 | ||
49 | extern struct inet_hashinfo dccp_hashinfo; | |
50 | ||
51 | extern struct percpu_counter dccp_orphan_count; | |
52 | ||
53 | void dccp_time_wait(struct sock *sk, int state, int timeo); | |
54 | ||
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(uint32_t)) | |
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) | |
67 | ||
68 | /* Upper bound for initial feature-negotiation overhead (padded to 32 bits) */ | |
69 | #define DCCP_FEATNEG_OVERHEAD (32 * sizeof(uint32_t)) | |
70 | ||
71 | #define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT | |
72 | * state, about 60 seconds */ | |
73 | ||
74 | /* RFC 1122, 4.2.3.1 initial RTO value */ | |
75 | #define DCCP_TIMEOUT_INIT ((unsigned int)(3 * HZ)) | |
76 | ||
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 int)(64 * HZ)) | |
85 | ||
86 | /* | |
87 | * RTT sampling: sanity bounds and fallback RTT value from RFC 4340, section 3.4 | |
88 | */ | |
89 | #define DCCP_SANE_RTT_MIN 100 | |
90 | #define DCCP_FALLBACK_RTT (USEC_PER_SEC / 5) | |
91 | #define DCCP_SANE_RTT_MAX (3 * USEC_PER_SEC) | |
92 | ||
93 | /* sysctl variables for DCCP */ | |
94 | extern int sysctl_dccp_request_retries; | |
95 | extern int sysctl_dccp_retries1; | |
96 | extern int sysctl_dccp_retries2; | |
97 | extern int sysctl_dccp_tx_qlen; | |
98 | extern int sysctl_dccp_sync_ratelimit; | |
99 | ||
100 | /* | |
101 | * 48-bit sequence number arithmetic (signed and unsigned) | |
102 | */ | |
103 | #define INT48_MIN 0x800000000000LL /* 2^47 */ | |
104 | #define UINT48_MAX 0xFFFFFFFFFFFFLL /* 2^48 - 1 */ | |
105 | #define COMPLEMENT48(x) (0x1000000000000LL - (x)) /* 2^48 - x */ | |
106 | #define TO_SIGNED48(x) (((x) < INT48_MIN)? (x) : -COMPLEMENT48( (x))) | |
107 | #define TO_UNSIGNED48(x) (((x) >= 0)? (x) : COMPLEMENT48(-(x))) | |
108 | #define ADD48(a, b) (((a) + (b)) & UINT48_MAX) | |
109 | #define SUB48(a, b) ADD48((a), COMPLEMENT48(b)) | |
110 | ||
111 | static inline void dccp_set_seqno(u64 *seqno, u64 value) | |
112 | { | |
113 | *seqno = value & UINT48_MAX; | |
114 | } | |
115 | ||
116 | static inline void dccp_inc_seqno(u64 *seqno) | |
117 | { | |
118 | *seqno = ADD48(*seqno, 1); | |
119 | } | |
120 | ||
121 | /* signed mod-2^48 distance: pos. if seqno1 < seqno2, neg. if seqno1 > seqno2 */ | |
122 | static inline s64 dccp_delta_seqno(const u64 seqno1, const u64 seqno2) | |
123 | { | |
124 | u64 delta = SUB48(seqno2, seqno1); | |
125 | ||
126 | return TO_SIGNED48(delta); | |
127 | } | |
128 | ||
129 | /* is seq1 < seq2 ? */ | |
130 | static inline int before48(const u64 seq1, const u64 seq2) | |
131 | { | |
132 | return (s64)((seq2 << 16) - (seq1 << 16)) > 0; | |
133 | } | |
134 | ||
135 | /* is seq1 > seq2 ? */ | |
136 | #define after48(seq1, seq2) before48(seq2, seq1) | |
137 | ||
138 | /* is seq2 <= seq1 <= seq3 ? */ | |
139 | static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3) | |
140 | { | |
141 | return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16); | |
142 | } | |
143 | ||
144 | static inline u64 max48(const u64 seq1, const u64 seq2) | |
145 | { | |
146 | return after48(seq1, seq2) ? seq1 : seq2; | |
147 | } | |
148 | ||
149 | /** | |
150 | * dccp_loss_count - Approximate the number of lost data packets in a burst loss | |
151 | * @s1: last known sequence number before the loss ('hole') | |
152 | * @s2: first sequence number seen after the 'hole' | |
153 | * @ndp: NDP count on packet with sequence number @s2 | |
154 | */ | |
155 | static inline u64 dccp_loss_count(const u64 s1, const u64 s2, const u64 ndp) | |
156 | { | |
157 | s64 delta = dccp_delta_seqno(s1, s2); | |
158 | ||
159 | WARN_ON(delta < 0); | |
160 | delta -= ndp + 1; | |
161 | ||
162 | return delta > 0 ? delta : 0; | |
163 | } | |
164 | ||
165 | /** | |
166 | * dccp_loss_free - Evaluate condition for data loss from RFC 4340, 7.7.1 | |
167 | */ | |
168 | static inline bool dccp_loss_free(const u64 s1, const u64 s2, const u64 ndp) | |
169 | { | |
170 | return dccp_loss_count(s1, s2, ndp) == 0; | |
171 | } | |
172 | ||
173 | enum { | |
174 | DCCP_MIB_NUM = 0, | |
175 | DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */ | |
176 | DCCP_MIB_ESTABRESETS, /* EstabResets */ | |
177 | DCCP_MIB_CURRESTAB, /* CurrEstab */ | |
178 | DCCP_MIB_OUTSEGS, /* OutSegs */ | |
179 | DCCP_MIB_OUTRSTS, | |
180 | DCCP_MIB_ABORTONTIMEOUT, | |
181 | DCCP_MIB_TIMEOUTS, | |
182 | DCCP_MIB_ABORTFAILED, | |
183 | DCCP_MIB_PASSIVEOPENS, | |
184 | DCCP_MIB_ATTEMPTFAILS, | |
185 | DCCP_MIB_OUTDATAGRAMS, | |
186 | DCCP_MIB_INERRS, | |
187 | DCCP_MIB_OPTMANDATORYERROR, | |
188 | DCCP_MIB_INVALIDOPT, | |
189 | __DCCP_MIB_MAX | |
190 | }; | |
191 | ||
192 | #define DCCP_MIB_MAX __DCCP_MIB_MAX | |
193 | struct dccp_mib { | |
194 | unsigned long mibs[DCCP_MIB_MAX]; | |
195 | }; | |
196 | ||
197 | DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics); | |
198 | #define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field) | |
199 | #define __DCCP_INC_STATS(field) __SNMP_INC_STATS(dccp_statistics, field) | |
200 | #define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field) | |
201 | ||
202 | /* | |
203 | * Checksumming routines | |
204 | */ | |
205 | static inline unsigned int dccp_csum_coverage(const struct sk_buff *skb) | |
206 | { | |
207 | const struct dccp_hdr* dh = dccp_hdr(skb); | |
208 | ||
209 | if (dh->dccph_cscov == 0) | |
210 | return skb->len; | |
211 | return (dh->dccph_doff + dh->dccph_cscov - 1) * sizeof(u32); | |
212 | } | |
213 | ||
214 | static inline void dccp_csum_outgoing(struct sk_buff *skb) | |
215 | { | |
216 | unsigned int cov = dccp_csum_coverage(skb); | |
217 | ||
218 | if (cov >= skb->len) | |
219 | dccp_hdr(skb)->dccph_cscov = 0; | |
220 | ||
221 | skb->csum = skb_checksum(skb, 0, (cov > skb->len)? skb->len : cov, 0); | |
222 | } | |
223 | ||
224 | void dccp_v4_send_check(struct sock *sk, struct sk_buff *skb); | |
225 | ||
226 | int dccp_retransmit_skb(struct sock *sk); | |
227 | ||
228 | void dccp_send_ack(struct sock *sk); | |
229 | void dccp_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, | |
230 | struct request_sock *rsk); | |
231 | ||
232 | void dccp_send_sync(struct sock *sk, const u64 seq, | |
233 | const enum dccp_pkt_type pkt_type); | |
234 | ||
235 | /* | |
236 | * TX Packet Dequeueing Interface | |
237 | */ | |
238 | void dccp_qpolicy_push(struct sock *sk, struct sk_buff *skb); | |
239 | bool dccp_qpolicy_full(struct sock *sk); | |
240 | void dccp_qpolicy_drop(struct sock *sk, struct sk_buff *skb); | |
241 | struct sk_buff *dccp_qpolicy_top(struct sock *sk); | |
242 | struct sk_buff *dccp_qpolicy_pop(struct sock *sk); | |
243 | bool dccp_qpolicy_param_ok(struct sock *sk, __be32 param); | |
244 | ||
245 | /* | |
246 | * TX Packet Output and TX Timers | |
247 | */ | |
248 | void dccp_write_xmit(struct sock *sk); | |
249 | void dccp_write_space(struct sock *sk); | |
250 | void dccp_flush_write_queue(struct sock *sk, long *time_budget); | |
251 | ||
252 | void dccp_init_xmit_timers(struct sock *sk); | |
253 | static inline void dccp_clear_xmit_timers(struct sock *sk) | |
254 | { | |
255 | inet_csk_clear_xmit_timers(sk); | |
256 | } | |
257 | ||
258 | unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu); | |
259 | ||
260 | const char *dccp_packet_name(const int type); | |
261 | ||
262 | void dccp_set_state(struct sock *sk, const int state); | |
263 | void dccp_done(struct sock *sk); | |
264 | ||
265 | int dccp_reqsk_init(struct request_sock *rq, struct dccp_sock const *dp, | |
266 | struct sk_buff const *skb); | |
267 | ||
268 | int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb); | |
269 | ||
270 | struct sock *dccp_create_openreq_child(const struct sock *sk, | |
271 | const struct request_sock *req, | |
272 | const struct sk_buff *skb); | |
273 | ||
274 | int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb); | |
275 | ||
276 | struct sock *dccp_v4_request_recv_sock(const struct sock *sk, struct sk_buff *skb, | |
277 | struct request_sock *req, | |
278 | struct dst_entry *dst, | |
279 | struct request_sock *req_unhash, | |
280 | bool *own_req); | |
281 | struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb, | |
282 | struct request_sock *req); | |
283 | ||
284 | int dccp_child_process(struct sock *parent, struct sock *child, | |
285 | struct sk_buff *skb); | |
286 | int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb, | |
287 | struct dccp_hdr *dh, unsigned int len); | |
288 | int dccp_rcv_established(struct sock *sk, struct sk_buff *skb, | |
289 | const struct dccp_hdr *dh, const unsigned int len); | |
290 | ||
291 | int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized); | |
292 | void dccp_destroy_sock(struct sock *sk); | |
293 | ||
294 | void dccp_close(struct sock *sk, long timeout); | |
295 | struct sk_buff *dccp_make_response(const struct sock *sk, struct dst_entry *dst, | |
296 | struct request_sock *req); | |
297 | ||
298 | int dccp_connect(struct sock *sk); | |
299 | int dccp_disconnect(struct sock *sk, int flags); | |
300 | int dccp_getsockopt(struct sock *sk, int level, int optname, | |
301 | char __user *optval, int __user *optlen); | |
302 | int dccp_setsockopt(struct sock *sk, int level, int optname, | |
303 | char __user *optval, unsigned int optlen); | |
304 | #ifdef CONFIG_COMPAT | |
305 | int compat_dccp_getsockopt(struct sock *sk, int level, int optname, | |
306 | char __user *optval, int __user *optlen); | |
307 | int compat_dccp_setsockopt(struct sock *sk, int level, int optname, | |
308 | char __user *optval, unsigned int optlen); | |
309 | #endif | |
310 | int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg); | |
311 | int dccp_sendmsg(struct sock *sk, struct msghdr *msg, size_t size); | |
312 | int dccp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock, | |
313 | int flags, int *addr_len); | |
314 | void dccp_shutdown(struct sock *sk, int how); | |
315 | int inet_dccp_listen(struct socket *sock, int backlog); | |
316 | __poll_t dccp_poll(struct file *file, struct socket *sock, | |
317 | poll_table *wait); | |
318 | int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); | |
319 | void dccp_req_err(struct sock *sk, u64 seq); | |
320 | ||
321 | struct sk_buff *dccp_ctl_make_reset(struct sock *sk, struct sk_buff *skb); | |
322 | int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code); | |
323 | void dccp_send_close(struct sock *sk, const int active); | |
324 | int dccp_invalid_packet(struct sk_buff *skb); | |
325 | u32 dccp_sample_rtt(struct sock *sk, long delta); | |
326 | ||
327 | static inline bool dccp_bad_service_code(const struct sock *sk, | |
328 | const __be32 service) | |
329 | { | |
330 | const struct dccp_sock *dp = dccp_sk(sk); | |
331 | ||
332 | if (dp->dccps_service == service) | |
333 | return false; | |
334 | return !dccp_list_has_service(dp->dccps_service_list, service); | |
335 | } | |
336 | ||
337 | /** | |
338 | * dccp_skb_cb - DCCP per-packet control information | |
339 | * @dccpd_type: one of %dccp_pkt_type (or unknown) | |
340 | * @dccpd_ccval: CCVal field (5.1), see e.g. RFC 4342, 8.1 | |
341 | * @dccpd_reset_code: one of %dccp_reset_codes | |
342 | * @dccpd_reset_data: Data1..3 fields (depend on @dccpd_reset_code) | |
343 | * @dccpd_opt_len: total length of all options (5.8) in the packet | |
344 | * @dccpd_seq: sequence number | |
345 | * @dccpd_ack_seq: acknowledgment number subheader field value | |
346 | * | |
347 | * This is used for transmission as well as for reception. | |
348 | */ | |
349 | struct dccp_skb_cb { | |
350 | union { | |
351 | struct inet_skb_parm h4; | |
352 | #if IS_ENABLED(CONFIG_IPV6) | |
353 | struct inet6_skb_parm h6; | |
354 | #endif | |
355 | } header; | |
356 | __u8 dccpd_type:4; | |
357 | __u8 dccpd_ccval:4; | |
358 | __u8 dccpd_reset_code, | |
359 | dccpd_reset_data[3]; | |
360 | __u16 dccpd_opt_len; | |
361 | __u64 dccpd_seq; | |
362 | __u64 dccpd_ack_seq; | |
363 | }; | |
364 | ||
365 | #define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0])) | |
366 | ||
367 | /* RFC 4340, sec. 7.7 */ | |
368 | static inline int dccp_non_data_packet(const struct sk_buff *skb) | |
369 | { | |
370 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; | |
371 | ||
372 | return type == DCCP_PKT_ACK || | |
373 | type == DCCP_PKT_CLOSE || | |
374 | type == DCCP_PKT_CLOSEREQ || | |
375 | type == DCCP_PKT_RESET || | |
376 | type == DCCP_PKT_SYNC || | |
377 | type == DCCP_PKT_SYNCACK; | |
378 | } | |
379 | ||
380 | /* RFC 4340, sec. 7.7 */ | |
381 | static inline int dccp_data_packet(const struct sk_buff *skb) | |
382 | { | |
383 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; | |
384 | ||
385 | return type == DCCP_PKT_DATA || | |
386 | type == DCCP_PKT_DATAACK || | |
387 | type == DCCP_PKT_REQUEST || | |
388 | type == DCCP_PKT_RESPONSE; | |
389 | } | |
390 | ||
391 | static inline int dccp_packet_without_ack(const struct sk_buff *skb) | |
392 | { | |
393 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; | |
394 | ||
395 | return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST; | |
396 | } | |
397 | ||
398 | #define DCCP_PKT_WITHOUT_ACK_SEQ (UINT48_MAX << 2) | |
399 | ||
400 | static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss) | |
401 | { | |
402 | struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh + | |
403 | sizeof(*dh)); | |
404 | dh->dccph_seq2 = 0; | |
405 | dh->dccph_seq = htons((gss >> 32) & 0xfffff); | |
406 | dhx->dccph_seq_low = htonl(gss & 0xffffffff); | |
407 | } | |
408 | ||
409 | static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack, | |
410 | const u64 gsr) | |
411 | { | |
412 | dhack->dccph_reserved1 = 0; | |
413 | dhack->dccph_ack_nr_high = htons(gsr >> 32); | |
414 | dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff); | |
415 | } | |
416 | ||
417 | static inline void dccp_update_gsr(struct sock *sk, u64 seq) | |
418 | { | |
419 | struct dccp_sock *dp = dccp_sk(sk); | |
420 | ||
421 | if (after48(seq, dp->dccps_gsr)) | |
422 | dp->dccps_gsr = seq; | |
423 | /* Sequence validity window depends on remote Sequence Window (7.5.1) */ | |
424 | dp->dccps_swl = SUB48(ADD48(dp->dccps_gsr, 1), dp->dccps_r_seq_win / 4); | |
425 | /* | |
426 | * Adjust SWL so that it is not below ISR. In contrast to RFC 4340, | |
427 | * 7.5.1 we perform this check beyond the initial handshake: W/W' are | |
428 | * always > 32, so for the first W/W' packets in the lifetime of a | |
429 | * connection we always have to adjust SWL. | |
430 | * A second reason why we are doing this is that the window depends on | |
431 | * the feature-remote value of Sequence Window: nothing stops the peer | |
432 | * from updating this value while we are busy adjusting SWL for the | |
433 | * first W packets (we would have to count from scratch again then). | |
434 | * Therefore it is safer to always make sure that the Sequence Window | |
435 | * is not artificially extended by a peer who grows SWL downwards by | |
436 | * continually updating the feature-remote Sequence-Window. | |
437 | * If sequence numbers wrap it is bad luck. But that will take a while | |
438 | * (48 bit), and this measure prevents Sequence-number attacks. | |
439 | */ | |
440 | if (before48(dp->dccps_swl, dp->dccps_isr)) | |
441 | dp->dccps_swl = dp->dccps_isr; | |
442 | dp->dccps_swh = ADD48(dp->dccps_gsr, (3 * dp->dccps_r_seq_win) / 4); | |
443 | } | |
444 | ||
445 | static inline void dccp_update_gss(struct sock *sk, u64 seq) | |
446 | { | |
447 | struct dccp_sock *dp = dccp_sk(sk); | |
448 | ||
449 | dp->dccps_gss = seq; | |
450 | /* Ack validity window depends on local Sequence Window value (7.5.1) */ | |
451 | dp->dccps_awl = SUB48(ADD48(dp->dccps_gss, 1), dp->dccps_l_seq_win); | |
452 | /* Adjust AWL so that it is not below ISS - see comment above for SWL */ | |
453 | if (before48(dp->dccps_awl, dp->dccps_iss)) | |
454 | dp->dccps_awl = dp->dccps_iss; | |
455 | dp->dccps_awh = dp->dccps_gss; | |
456 | } | |
457 | ||
458 | static inline int dccp_ackvec_pending(const struct sock *sk) | |
459 | { | |
460 | return dccp_sk(sk)->dccps_hc_rx_ackvec != NULL && | |
461 | !dccp_ackvec_is_empty(dccp_sk(sk)->dccps_hc_rx_ackvec); | |
462 | } | |
463 | ||
464 | static inline int dccp_ack_pending(const struct sock *sk) | |
465 | { | |
466 | return dccp_ackvec_pending(sk) || inet_csk_ack_scheduled(sk); | |
467 | } | |
468 | ||
469 | int dccp_feat_signal_nn_change(struct sock *sk, u8 feat, u64 nn_val); | |
470 | int dccp_feat_finalise_settings(struct dccp_sock *dp); | |
471 | int dccp_feat_server_ccid_dependencies(struct dccp_request_sock *dreq); | |
472 | int dccp_feat_insert_opts(struct dccp_sock*, struct dccp_request_sock*, | |
473 | struct sk_buff *skb); | |
474 | int dccp_feat_activate_values(struct sock *sk, struct list_head *fn); | |
475 | void dccp_feat_list_purge(struct list_head *fn_list); | |
476 | ||
477 | int dccp_insert_options(struct sock *sk, struct sk_buff *skb); | |
478 | int dccp_insert_options_rsk(struct dccp_request_sock *, struct sk_buff *); | |
479 | u32 dccp_timestamp(void); | |
480 | void dccp_timestamping_init(void); | |
481 | int dccp_insert_option(struct sk_buff *skb, unsigned char option, | |
482 | const void *value, unsigned char len); | |
483 | ||
484 | #ifdef CONFIG_SYSCTL | |
485 | int dccp_sysctl_init(void); | |
486 | void dccp_sysctl_exit(void); | |
487 | #else | |
488 | static inline int dccp_sysctl_init(void) | |
489 | { | |
490 | return 0; | |
491 | } | |
492 | ||
493 | static inline void dccp_sysctl_exit(void) | |
494 | { | |
495 | } | |
496 | #endif | |
497 | ||
498 | #endif /* _DCCP_H */ |