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Merge tag 'objtool-urgent-2022-06-19' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-block.git] / net / dccp / dccp.h
CommitLineData
d2912cb1 1/* SPDX-License-Identifier: GPL-2.0-only */
7c657876
ACM		 2#ifndef _DCCP_H
3#define _DCCP_H
4/*
5 * net/dccp/dccp.h
6 *
7 * An implementation of the DCCP protocol
1bc09869 8 * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
e6bccd35 9 * Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.nz>
7c657876
ACM		 10 */
11
12#include <linux/dccp.h>
9823b7b5 13#include <linux/ktime.h>
7c657876
ACM		 14#include <net/snmp.h>
15#include <net/sock.h>
16#include <net/tcp.h>
ae31c339 17#include "ackvec.h"
7c657876 18
59348b19
GR		 19/*
20 * DCCP - specific warning and debugging macros.
21 */
c0560b9c
JP		 22#define DCCP_WARN(fmt, ...) \
23 net_warn_ratelimited("%s: " fmt, __func__, ##__VA_ARGS__)
59348b19 24#define DCCP_CRIT(fmt, a...) printk(KERN_CRIT fmt " at %s:%d/%s()\n", ##a, \
0dc47877 25 __FILE__, __LINE__, __func__)
59348b19
GR		 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)); \
3c695262
GR		 30 } while (0)
31
84116716
GR		 32#define DCCP_PRINTK(enable, fmt, args...) do { if (enable) \
33 printk(fmt, ##args); \
c9eaf173 34 } while(0)
84116716 35#define DCCP_PR_DEBUG(enable, fmt, a...) DCCP_PRINTK(enable, KERN_DEBUG \
0dc47877 36 "%s: " fmt, __func__, ##a)
84116716 37
725ba8ee 38#ifdef CONFIG_IP_DCCP_DEBUG
eb939922 39extern bool dccp_debug;
84116716
GR		 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)
f3f3abb6 42#define dccp_debug(fmt, a...) dccp_pr_debug_cat(KERN_DEBUG fmt, ##a)
7c657876 43#else
86aab09a
RD		 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)
7c657876
ACM		 47#endif
48
49extern struct inet_hashinfo dccp_hashinfo;
50
19757ceb 51DECLARE_PER_CPU(unsigned int, dccp_orphan_count);
7c657876 52
a402a5aa 53void dccp_time_wait(struct sock *sk, int state, int timeo);
7c657876 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 */
86739fb9 63#define MAX_DCCP_SPECIFIC_HEADER (255 * sizeof(uint32_t))
60361be1
GR		 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 67
86739fb9
GR		 68/* Upper bound for initial feature-negotiation overhead (padded to 32 bits) */
69#define DCCP_FEATNEG_OVERHEAD (32 * sizeof(uint32_t))
70
7c657876
ACM		 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 */
95c96174 75#define DCCP_TIMEOUT_INIT ((unsigned int)(3 * HZ))
7c657876 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 */
95c96174 84#define DCCP_RTO_MAX ((unsigned int)(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
2e2e9e92
GR		 93/* sysctl variables for DCCP */
94extern int sysctl_dccp_request_retries;
95extern int sysctl_dccp_retries1;
96extern int sysctl_dccp_retries2;
b1308dc0 97extern int sysctl_dccp_tx_qlen;
a94f0f97 98extern int sysctl_dccp_sync_ratelimit;
2e2e9e92 99
6b811d43
GR		 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
6b811d43
GR		 111static 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 */
117static 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 125static 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 134static 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
2013c7e3 139/**
d196c9a5
IC		 140 * dccp_loss_count - Approximate the number of lost data packets in a burst loss
141 * @s1: last known sequence number before the loss ('hole')
142 * @s2: first sequence number seen after the 'hole'
2013c7e3 143 * @ndp: NDP count on packet with sequence number @s2
2013c7e3 144 */
d196c9a5 145static inline u64 dccp_loss_count(const u64 s1, const u64 s2, const u64 ndp)
2013c7e3
GR		 146{
147 s64 delta = dccp_delta_seqno(s1, s2);
148
547b792c 149 WARN_ON(delta < 0);
d196c9a5
IC		 150 delta -= ndp + 1;
151
152 return delta > 0 ? delta : 0;
153}
154
155/**
156 * dccp_loss_free - Evaluate condition for data loss from RFC 4340, 7.7.1
157 */
158static inline bool dccp_loss_free(const u64 s1, const u64 s2, const u64 ndp)
159{
160 return dccp_loss_count(s1, s2, ndp) == 0;
2013c7e3
GR		 161}
162
7c657876
ACM		 163enum {
164 DCCP_MIB_NUM = 0,
165 DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */
166 DCCP_MIB_ESTABRESETS, /* EstabResets */
167 DCCP_MIB_CURRESTAB, /* CurrEstab */
c9eaf173 168 DCCP_MIB_OUTSEGS, /* OutSegs */
7c657876
ACM		 169 DCCP_MIB_OUTRSTS,
170 DCCP_MIB_ABORTONTIMEOUT,
171 DCCP_MIB_TIMEOUTS,
172 DCCP_MIB_ABORTFAILED,
173 DCCP_MIB_PASSIVEOPENS,
174 DCCP_MIB_ATTEMPTFAILS,
175 DCCP_MIB_OUTDATAGRAMS,
176 DCCP_MIB_INERRS,
177 DCCP_MIB_OPTMANDATORYERROR,
178 DCCP_MIB_INVALIDOPT,
179 __DCCP_MIB_MAX
180};
181
182#define DCCP_MIB_MAX __DCCP_MIB_MAX
183struct dccp_mib {
184 unsigned long mibs[DCCP_MIB_MAX];
ec733b15 185};
7c657876
ACM		 186
187DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics);
aa62d76b 188#define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field)
13415e46 189#define __DCCP_INC_STATS(field) __SNMP_INC_STATS(dccp_statistics, field)
aa62d76b 190#define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field)
7c657876 191
6f4e5fff
GR		 192/*
193 * Checksumming routines
194 */
e961811f 195static inline unsigned int dccp_csum_coverage(const struct sk_buff *skb)
6f4e5fff
GR		 196{
197 const struct dccp_hdr* dh = dccp_hdr(skb);
198
199 if (dh->dccph_cscov == 0)
200 return skb->len;
201 return (dh->dccph_doff + dh->dccph_cscov - 1) * sizeof(u32);
202}
203
204static inline void dccp_csum_outgoing(struct sk_buff *skb)
205{
e961811f 206 unsigned int cov = dccp_csum_coverage(skb);
6f4e5fff
GR		 207
208 if (cov >= skb->len)
209 dccp_hdr(skb)->dccph_cscov = 0;
210
211 skb->csum = skb_checksum(skb, 0, (cov > skb->len)? skb->len : cov, 0);
212}
213
a402a5aa 214void dccp_v4_send_check(struct sock *sk, struct sk_buff *skb);
6f4e5fff 215
a402a5aa 216int dccp_retransmit_skb(struct sock *sk);
7c657876 217
a402a5aa 218void dccp_send_ack(struct sock *sk);
a00e7444 219void dccp_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
a402a5aa 220 struct request_sock *rsk);
8a73cd09 221
a402a5aa
JP		 222void dccp_send_sync(struct sock *sk, const u64 seq,
223 const enum dccp_pkt_type pkt_type);
7c657876 224
871a2c16
TG		 225/*
226 * TX Packet Dequeueing Interface
227 */
a402a5aa
JP		 228void dccp_qpolicy_push(struct sock *sk, struct sk_buff *skb);
229bool dccp_qpolicy_full(struct sock *sk);
230void dccp_qpolicy_drop(struct sock *sk, struct sk_buff *skb);
231struct sk_buff *dccp_qpolicy_top(struct sock *sk);
232struct sk_buff *dccp_qpolicy_pop(struct sock *sk);
233bool dccp_qpolicy_param_ok(struct sock *sk, __be32 param);
871a2c16
TG		 234
235/*
236 * TX Packet Output and TX Timers
237 */
a402a5aa
JP		 238void dccp_write_xmit(struct sock *sk);
239void dccp_write_space(struct sock *sk);
240void dccp_flush_write_queue(struct sock *sk, long *time_budget);
27258ee5 241
a402a5aa 242void dccp_init_xmit_timers(struct sock *sk);
7c657876
ACM		 243static inline void dccp_clear_xmit_timers(struct sock *sk)
244{
245 inet_csk_clear_xmit_timers(sk);
246}
247
a402a5aa 248unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu);
7c657876 249
a402a5aa 250const char *dccp_packet_name(const int type);
7c657876 251
a402a5aa
JP		 252void dccp_set_state(struct sock *sk, const int state);
253void dccp_done(struct sock *sk);
7c657876 254
a402a5aa
JP		 255int dccp_reqsk_init(struct request_sock *rq, struct dccp_sock const *dp,
256 struct sk_buff const *skb);
7c657876 257
a402a5aa 258int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb);
7c657876 259
54105f98 260struct sock *dccp_create_openreq_child(const struct sock *sk,
a402a5aa
JP		 261 const struct request_sock *req,
262 const struct sk_buff *skb);
7c657876 263
a402a5aa 264int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb);
7c657876 265
0c27171e 266struct sock *dccp_v4_request_recv_sock(const struct sock *sk, struct sk_buff *skb,
a402a5aa 267 struct request_sock *req,
5e0724d0
ED		 268 struct dst_entry *dst,
269 struct request_sock *req_unhash,
270 bool *own_req);
a402a5aa 271struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb,
52452c54 272 struct request_sock *req);
7c657876 273
a402a5aa
JP		 274int dccp_child_process(struct sock *parent, struct sock *child,
275 struct sk_buff *skb);
276int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
277 struct dccp_hdr *dh, unsigned int len);
278int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
279 const struct dccp_hdr *dh, const unsigned int len);
7c657876 280
a402a5aa
JP		 281int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized);
282void dccp_destroy_sock(struct sock *sk);
f21e68ca 283
a402a5aa 284void dccp_close(struct sock *sk, long timeout);
802885fc 285struct sk_buff *dccp_make_response(const struct sock *sk, struct dst_entry *dst,
a402a5aa 286 struct request_sock *req);
7c657876 287
a402a5aa
JP		 288int dccp_connect(struct sock *sk);
289int dccp_disconnect(struct sock *sk, int flags);
290int dccp_getsockopt(struct sock *sk, int level, int optname,
291 char __user *optval, int __user *optlen);
292int dccp_setsockopt(struct sock *sk, int level, int optname,
a7b75c5a 293 sockptr_t optval, unsigned int optlen);
a402a5aa 294int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg);
1b784140 295int dccp_sendmsg(struct sock *sk, struct msghdr *msg, size_t size);
ec095263
OH		 296int dccp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int flags,
297 int *addr_len);
a402a5aa
JP		 298void dccp_shutdown(struct sock *sk, int how);
299int inet_dccp_listen(struct socket *sock, int backlog);
a11e1d43
LT		 300__poll_t dccp_poll(struct file *file, struct socket *sock,
301 poll_table *wait);
a402a5aa 302int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
85645bab 303void dccp_req_err(struct sock *sk, u64 seq);
a402a5aa
JP		 304
305struct sk_buff *dccp_ctl_make_reset(struct sock *sk, struct sk_buff *skb);
306int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code);
307void dccp_send_close(struct sock *sk, const int active);
308int dccp_invalid_packet(struct sk_buff *skb);
309u32 dccp_sample_rtt(struct sock *sk, long delta);
f21e68ca 310
45ae74f5 311static inline bool dccp_bad_service_code(const struct sock *sk,
60fe62e7 312 const __be32 service)
f21e68ca
ACM		 313{
314 const struct dccp_sock *dp = dccp_sk(sk);
315
316 if (dp->dccps_service == service)
45ae74f5 317 return false;
f21e68ca
ACM		 318 return !dccp_list_has_service(dp->dccps_service_list, service);
319}
7c657876 320
0430ee34
GR		 321/**
322 * dccp_skb_cb - DCCP per-packet control information
323 * @dccpd_type: one of %dccp_pkt_type (or unknown)
324 * @dccpd_ccval: CCVal field (5.1), see e.g. RFC 4342, 8.1
325 * @dccpd_reset_code: one of %dccp_reset_codes
326 * @dccpd_reset_data: Data1..3 fields (depend on @dccpd_reset_code)
327 * @dccpd_opt_len: total length of all options (5.8) in the packet
328 * @dccpd_seq: sequence number
329 * @dccpd_ack_seq: acknowledgment number subheader field value
2c53040f 330 *
0430ee34
GR		 331 * This is used for transmission as well as for reception.
332 */
7c657876 333struct dccp_skb_cb {
028b0275
PM		 334 union {
335 struct inet_skb_parm h4;
dfd56b8b 336#if IS_ENABLED(CONFIG_IPV6)
028b0275
PM		 337 struct inet6_skb_parm h6;
338#endif
339 } header;
67e6b629
ACM		 340 __u8 dccpd_type:4;
341 __u8 dccpd_ccval:4;
0430ee34
GR		 342 __u8 dccpd_reset_code,
343 dccpd_reset_data[3];
67e6b629 344 __u16 dccpd_opt_len;
7c657876
ACM		 345 __u64 dccpd_seq;
346 __u64 dccpd_ack_seq;
7c657876
ACM		 347};
348
349#define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0]))
350
2180c41c 351/* RFC 4340, sec. 7.7 */
7c657876
ACM		 352static inline int dccp_non_data_packet(const struct sk_buff *skb)
353{
354 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
355
356 return type == DCCP_PKT_ACK ||
357 type == DCCP_PKT_CLOSE ||
358 type == DCCP_PKT_CLOSEREQ ||
359 type == DCCP_PKT_RESET ||
360 type == DCCP_PKT_SYNC ||
361 type == DCCP_PKT_SYNCACK;
362}
363
2180c41c
GR		 364/* RFC 4340, sec. 7.7 */
365static inline int dccp_data_packet(const struct sk_buff *skb)
366{
367 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
368
369 return type == DCCP_PKT_DATA ||
370 type == DCCP_PKT_DATAACK ||
371 type == DCCP_PKT_REQUEST ||
372 type == DCCP_PKT_RESPONSE;
373}
374
7c657876
ACM		 375static inline int dccp_packet_without_ack(const struct sk_buff *skb)
376{
377 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
378
379 return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST;
380}
381
6b811d43 382#define DCCP_PKT_WITHOUT_ACK_SEQ (UINT48_MAX << 2)
7c657876
ACM		 383
384static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss)
385{
7690af3f
ACM		 386 struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh +
387 sizeof(*dh));
60fe62e7
AB		 388 dh->dccph_seq2 = 0;
389 dh->dccph_seq = htons((gss >> 32) & 0xfffff);
7c657876
ACM		 390 dhx->dccph_seq_low = htonl(gss & 0xffffffff);
391}
392
7690af3f
ACM		 393static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack,
394 const u64 gsr)
7c657876 395{
60fe62e7
AB		 396 dhack->dccph_reserved1 = 0;
397 dhack->dccph_ack_nr_high = htons(gsr >> 32);
7c657876
ACM		 398 dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff);
399}
400
401static inline void dccp_update_gsr(struct sock *sk, u64 seq)
402{
403 struct dccp_sock *dp = dccp_sk(sk);
7c657876 404
763dadd4
SJ		 405 if (after48(seq, dp->dccps_gsr))
406 dp->dccps_gsr = seq;
792b4878
GR		 407 /* Sequence validity window depends on remote Sequence Window (7.5.1) */
408 dp->dccps_swl = SUB48(ADD48(dp->dccps_gsr, 1), dp->dccps_r_seq_win / 4);
0b53d460
GR		 409 /*
410 * Adjust SWL so that it is not below ISR. In contrast to RFC 4340,
411 * 7.5.1 we perform this check beyond the initial handshake: W/W' are
412 * always > 32, so for the first W/W' packets in the lifetime of a
413 * connection we always have to adjust SWL.
414 * A second reason why we are doing this is that the window depends on
415 * the feature-remote value of Sequence Window: nothing stops the peer
416 * from updating this value while we are busy adjusting SWL for the
417 * first W packets (we would have to count from scratch again then).
418 * Therefore it is safer to always make sure that the Sequence Window
419 * is not artificially extended by a peer who grows SWL downwards by
420 * continually updating the feature-remote Sequence-Window.
421 * If sequence numbers wrap it is bad luck. But that will take a while
422 * (48 bit), and this measure prevents Sequence-number attacks.
423 */
424 if (before48(dp->dccps_swl, dp->dccps_isr))
425 dp->dccps_swl = dp->dccps_isr;
792b4878 426 dp->dccps_swh = ADD48(dp->dccps_gsr, (3 * dp->dccps_r_seq_win) / 4);
7c657876
ACM		 427}
428
429static inline void dccp_update_gss(struct sock *sk, u64 seq)
430{
431 struct dccp_sock *dp = dccp_sk(sk);
7c657876 432
792b4878
GR		 433 dp->dccps_gss = seq;
434 /* Ack validity window depends on local Sequence Window value (7.5.1) */
435 dp->dccps_awl = SUB48(ADD48(dp->dccps_gss, 1), dp->dccps_l_seq_win);
0b53d460
GR		 436 /* Adjust AWL so that it is not below ISS - see comment above for SWL */
437 if (before48(dp->dccps_awl, dp->dccps_iss))
438 dp->dccps_awl = dp->dccps_iss;
792b4878 439 dp->dccps_awh = dp->dccps_gss;
7c657876 440}
c9eaf173 441
b3d14bff
GR		 442static inline int dccp_ackvec_pending(const struct sock *sk)
443{
444 return dccp_sk(sk)->dccps_hc_rx_ackvec != NULL &&
445 !dccp_ackvec_is_empty(dccp_sk(sk)->dccps_hc_rx_ackvec);
446}
447
ae31c339
ACM		 448static inline int dccp_ack_pending(const struct sock *sk)
449{
b3d14bff 450 return dccp_ackvec_pending(sk) || inet_csk_ack_scheduled(sk);
ae31c339 451}
7c657876 452
a402a5aa
JP		 453int dccp_feat_signal_nn_change(struct sock *sk, u8 feat, u64 nn_val);
454int dccp_feat_finalise_settings(struct dccp_sock *dp);
455int dccp_feat_server_ccid_dependencies(struct dccp_request_sock *dreq);
456int dccp_feat_insert_opts(struct dccp_sock*, struct dccp_request_sock*,
457 struct sk_buff *skb);
458int dccp_feat_activate_values(struct sock *sk, struct list_head *fn);
459void dccp_feat_list_purge(struct list_head *fn_list);
460
461int dccp_insert_options(struct sock *sk, struct sk_buff *skb);
462int dccp_insert_options_rsk(struct dccp_request_sock *, struct sk_buff *);
a402a5aa
JP		 463u32 dccp_timestamp(void);
464void dccp_timestamping_init(void);
465int dccp_insert_option(struct sk_buff *skb, unsigned char option,
466 const void *value, unsigned char len);
7c657876 467
e55d912f 468#ifdef CONFIG_SYSCTL
a402a5aa
JP		 469int dccp_sysctl_init(void);
470void dccp_sysctl_exit(void);
e55d912f
ACM		 471#else
472static inline int dccp_sysctl_init(void)
473{
474 return 0;
475}
476
477static inline void dccp_sysctl_exit(void)
478{
479}
480#endif
481
7c657876 482#endif /* _DCCP_H */
Linux 6.x block layer and io_uring tree(s)