Commit | Line | Data |
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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 | 39 | extern 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 ACM |
43 | #else |
44 | #define dccp_pr_debug(format, a...) | |
45 | #define dccp_pr_debug_cat(format, a...) | |
f3f3abb6 | 46 | #define dccp_debug(format, a...) |
7c657876 ACM |
47 | #endif |
48 | ||
49 | extern struct inet_hashinfo dccp_hashinfo; | |
50 | ||
dd24c001 | 51 | extern struct percpu_counter dccp_orphan_count; |
7c657876 | 52 | |
a402a5aa | 53 | void 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 */ |
94 | extern int sysctl_dccp_request_retries; | |
95 | extern int sysctl_dccp_retries1; | |
96 | extern int sysctl_dccp_retries2; | |
b1308dc0 | 97 | extern int sysctl_dccp_tx_qlen; |
a94f0f97 | 98 | extern 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 |
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 | ||
2013c7e3 | 144 | /** |
d196c9a5 IC |
145 | * dccp_loss_count - Approximate the number of lost data packets in a burst loss |
146 | * @s1: last known sequence number before the loss ('hole') | |
147 | * @s2: first sequence number seen after the 'hole' | |
2013c7e3 | 148 | * @ndp: NDP count on packet with sequence number @s2 |
2013c7e3 | 149 | */ |
d196c9a5 | 150 | static inline u64 dccp_loss_count(const u64 s1, const u64 s2, const u64 ndp) |
2013c7e3 GR |
151 | { |
152 | s64 delta = dccp_delta_seqno(s1, s2); | |
153 | ||
547b792c | 154 | WARN_ON(delta < 0); |
d196c9a5 IC |
155 | delta -= ndp + 1; |
156 | ||
157 | return delta > 0 ? delta : 0; | |
158 | } | |
159 | ||
160 | /** | |
161 | * dccp_loss_free - Evaluate condition for data loss from RFC 4340, 7.7.1 | |
162 | */ | |
163 | static inline bool dccp_loss_free(const u64 s1, const u64 s2, const u64 ndp) | |
164 | { | |
165 | return dccp_loss_count(s1, s2, ndp) == 0; | |
2013c7e3 GR |
166 | } |
167 | ||
7c657876 ACM |
168 | enum { |
169 | DCCP_MIB_NUM = 0, | |
170 | DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */ | |
171 | DCCP_MIB_ESTABRESETS, /* EstabResets */ | |
172 | DCCP_MIB_CURRESTAB, /* CurrEstab */ | |
c9eaf173 | 173 | DCCP_MIB_OUTSEGS, /* OutSegs */ |
7c657876 ACM |
174 | DCCP_MIB_OUTRSTS, |
175 | DCCP_MIB_ABORTONTIMEOUT, | |
176 | DCCP_MIB_TIMEOUTS, | |
177 | DCCP_MIB_ABORTFAILED, | |
178 | DCCP_MIB_PASSIVEOPENS, | |
179 | DCCP_MIB_ATTEMPTFAILS, | |
180 | DCCP_MIB_OUTDATAGRAMS, | |
181 | DCCP_MIB_INERRS, | |
182 | DCCP_MIB_OPTMANDATORYERROR, | |
183 | DCCP_MIB_INVALIDOPT, | |
184 | __DCCP_MIB_MAX | |
185 | }; | |
186 | ||
187 | #define DCCP_MIB_MAX __DCCP_MIB_MAX | |
188 | struct dccp_mib { | |
189 | unsigned long mibs[DCCP_MIB_MAX]; | |
ec733b15 | 190 | }; |
7c657876 ACM |
191 | |
192 | DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics); | |
aa62d76b | 193 | #define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field) |
13415e46 | 194 | #define __DCCP_INC_STATS(field) __SNMP_INC_STATS(dccp_statistics, field) |
aa62d76b | 195 | #define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field) |
7c657876 | 196 | |
6f4e5fff GR |
197 | /* |
198 | * Checksumming routines | |
199 | */ | |
e961811f | 200 | static inline unsigned int dccp_csum_coverage(const struct sk_buff *skb) |
6f4e5fff GR |
201 | { |
202 | const struct dccp_hdr* dh = dccp_hdr(skb); | |
203 | ||
204 | if (dh->dccph_cscov == 0) | |
205 | return skb->len; | |
206 | return (dh->dccph_doff + dh->dccph_cscov - 1) * sizeof(u32); | |
207 | } | |
208 | ||
209 | static inline void dccp_csum_outgoing(struct sk_buff *skb) | |
210 | { | |
e961811f | 211 | unsigned int cov = dccp_csum_coverage(skb); |
6f4e5fff GR |
212 | |
213 | if (cov >= skb->len) | |
214 | dccp_hdr(skb)->dccph_cscov = 0; | |
215 | ||
216 | skb->csum = skb_checksum(skb, 0, (cov > skb->len)? skb->len : cov, 0); | |
217 | } | |
218 | ||
a402a5aa | 219 | void dccp_v4_send_check(struct sock *sk, struct sk_buff *skb); |
6f4e5fff | 220 | |
a402a5aa | 221 | int dccp_retransmit_skb(struct sock *sk); |
7c657876 | 222 | |
a402a5aa | 223 | void dccp_send_ack(struct sock *sk); |
a00e7444 | 224 | void dccp_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, |
a402a5aa | 225 | struct request_sock *rsk); |
8a73cd09 | 226 | |
a402a5aa JP |
227 | void dccp_send_sync(struct sock *sk, const u64 seq, |
228 | const enum dccp_pkt_type pkt_type); | |
7c657876 | 229 | |
871a2c16 TG |
230 | /* |
231 | * TX Packet Dequeueing Interface | |
232 | */ | |
a402a5aa JP |
233 | void dccp_qpolicy_push(struct sock *sk, struct sk_buff *skb); |
234 | bool dccp_qpolicy_full(struct sock *sk); | |
235 | void dccp_qpolicy_drop(struct sock *sk, struct sk_buff *skb); | |
236 | struct sk_buff *dccp_qpolicy_top(struct sock *sk); | |
237 | struct sk_buff *dccp_qpolicy_pop(struct sock *sk); | |
238 | bool dccp_qpolicy_param_ok(struct sock *sk, __be32 param); | |
871a2c16 TG |
239 | |
240 | /* | |
241 | * TX Packet Output and TX Timers | |
242 | */ | |
a402a5aa JP |
243 | void dccp_write_xmit(struct sock *sk); |
244 | void dccp_write_space(struct sock *sk); | |
245 | void dccp_flush_write_queue(struct sock *sk, long *time_budget); | |
27258ee5 | 246 | |
a402a5aa | 247 | void dccp_init_xmit_timers(struct sock *sk); |
7c657876 ACM |
248 | static inline void dccp_clear_xmit_timers(struct sock *sk) |
249 | { | |
250 | inet_csk_clear_xmit_timers(sk); | |
251 | } | |
252 | ||
a402a5aa | 253 | unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu); |
7c657876 | 254 | |
a402a5aa | 255 | const char *dccp_packet_name(const int type); |
7c657876 | 256 | |
a402a5aa JP |
257 | void dccp_set_state(struct sock *sk, const int state); |
258 | void dccp_done(struct sock *sk); | |
7c657876 | 259 | |
a402a5aa JP |
260 | int dccp_reqsk_init(struct request_sock *rq, struct dccp_sock const *dp, |
261 | struct sk_buff const *skb); | |
7c657876 | 262 | |
a402a5aa | 263 | int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb); |
7c657876 | 264 | |
54105f98 | 265 | struct sock *dccp_create_openreq_child(const struct sock *sk, |
a402a5aa JP |
266 | const struct request_sock *req, |
267 | const struct sk_buff *skb); | |
7c657876 | 268 | |
a402a5aa | 269 | int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb); |
7c657876 | 270 | |
0c27171e | 271 | struct sock *dccp_v4_request_recv_sock(const struct sock *sk, struct sk_buff *skb, |
a402a5aa | 272 | struct request_sock *req, |
5e0724d0 ED |
273 | struct dst_entry *dst, |
274 | struct request_sock *req_unhash, | |
275 | bool *own_req); | |
a402a5aa | 276 | struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb, |
52452c54 | 277 | struct request_sock *req); |
7c657876 | 278 | |
a402a5aa JP |
279 | int dccp_child_process(struct sock *parent, struct sock *child, |
280 | struct sk_buff *skb); | |
281 | int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb, | |
282 | struct dccp_hdr *dh, unsigned int len); | |
283 | int dccp_rcv_established(struct sock *sk, struct sk_buff *skb, | |
284 | const struct dccp_hdr *dh, const unsigned int len); | |
7c657876 | 285 | |
a402a5aa JP |
286 | int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized); |
287 | void dccp_destroy_sock(struct sock *sk); | |
f21e68ca | 288 | |
a402a5aa | 289 | void dccp_close(struct sock *sk, long timeout); |
802885fc | 290 | struct sk_buff *dccp_make_response(const struct sock *sk, struct dst_entry *dst, |
a402a5aa | 291 | struct request_sock *req); |
7c657876 | 292 | |
a402a5aa JP |
293 | int dccp_connect(struct sock *sk); |
294 | int dccp_disconnect(struct sock *sk, int flags); | |
295 | int dccp_getsockopt(struct sock *sk, int level, int optname, | |
296 | char __user *optval, int __user *optlen); | |
297 | int dccp_setsockopt(struct sock *sk, int level, int optname, | |
a7b75c5a | 298 | sockptr_t optval, unsigned int optlen); |
a402a5aa | 299 | int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg); |
1b784140 YX |
300 | int dccp_sendmsg(struct sock *sk, struct msghdr *msg, size_t size); |
301 | int dccp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock, | |
302 | int flags, int *addr_len); | |
a402a5aa JP |
303 | void dccp_shutdown(struct sock *sk, int how); |
304 | int inet_dccp_listen(struct socket *sock, int backlog); | |
a11e1d43 LT |
305 | __poll_t dccp_poll(struct file *file, struct socket *sock, |
306 | poll_table *wait); | |
a402a5aa | 307 | int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); |
85645bab | 308 | void dccp_req_err(struct sock *sk, u64 seq); |
a402a5aa JP |
309 | |
310 | struct sk_buff *dccp_ctl_make_reset(struct sock *sk, struct sk_buff *skb); | |
311 | int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code); | |
312 | void dccp_send_close(struct sock *sk, const int active); | |
313 | int dccp_invalid_packet(struct sk_buff *skb); | |
314 | u32 dccp_sample_rtt(struct sock *sk, long delta); | |
f21e68ca | 315 | |
45ae74f5 | 316 | static inline bool dccp_bad_service_code(const struct sock *sk, |
60fe62e7 | 317 | const __be32 service) |
f21e68ca ACM |
318 | { |
319 | const struct dccp_sock *dp = dccp_sk(sk); | |
320 | ||
321 | if (dp->dccps_service == service) | |
45ae74f5 | 322 | return false; |
f21e68ca ACM |
323 | return !dccp_list_has_service(dp->dccps_service_list, service); |
324 | } | |
7c657876 | 325 | |
0430ee34 GR |
326 | /** |
327 | * dccp_skb_cb - DCCP per-packet control information | |
328 | * @dccpd_type: one of %dccp_pkt_type (or unknown) | |
329 | * @dccpd_ccval: CCVal field (5.1), see e.g. RFC 4342, 8.1 | |
330 | * @dccpd_reset_code: one of %dccp_reset_codes | |
331 | * @dccpd_reset_data: Data1..3 fields (depend on @dccpd_reset_code) | |
332 | * @dccpd_opt_len: total length of all options (5.8) in the packet | |
333 | * @dccpd_seq: sequence number | |
334 | * @dccpd_ack_seq: acknowledgment number subheader field value | |
2c53040f | 335 | * |
0430ee34 GR |
336 | * This is used for transmission as well as for reception. |
337 | */ | |
7c657876 | 338 | struct dccp_skb_cb { |
028b0275 PM |
339 | union { |
340 | struct inet_skb_parm h4; | |
dfd56b8b | 341 | #if IS_ENABLED(CONFIG_IPV6) |
028b0275 PM |
342 | struct inet6_skb_parm h6; |
343 | #endif | |
344 | } header; | |
67e6b629 ACM |
345 | __u8 dccpd_type:4; |
346 | __u8 dccpd_ccval:4; | |
0430ee34 GR |
347 | __u8 dccpd_reset_code, |
348 | dccpd_reset_data[3]; | |
67e6b629 | 349 | __u16 dccpd_opt_len; |
7c657876 ACM |
350 | __u64 dccpd_seq; |
351 | __u64 dccpd_ack_seq; | |
7c657876 ACM |
352 | }; |
353 | ||
354 | #define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0])) | |
355 | ||
2180c41c | 356 | /* RFC 4340, sec. 7.7 */ |
7c657876 ACM |
357 | static inline int dccp_non_data_packet(const struct sk_buff *skb) |
358 | { | |
359 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; | |
360 | ||
361 | return type == DCCP_PKT_ACK || | |
362 | type == DCCP_PKT_CLOSE || | |
363 | type == DCCP_PKT_CLOSEREQ || | |
364 | type == DCCP_PKT_RESET || | |
365 | type == DCCP_PKT_SYNC || | |
366 | type == DCCP_PKT_SYNCACK; | |
367 | } | |
368 | ||
2180c41c GR |
369 | /* RFC 4340, sec. 7.7 */ |
370 | static inline int dccp_data_packet(const struct sk_buff *skb) | |
371 | { | |
372 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; | |
373 | ||
374 | return type == DCCP_PKT_DATA || | |
375 | type == DCCP_PKT_DATAACK || | |
376 | type == DCCP_PKT_REQUEST || | |
377 | type == DCCP_PKT_RESPONSE; | |
378 | } | |
379 | ||
7c657876 ACM |
380 | static inline int dccp_packet_without_ack(const struct sk_buff *skb) |
381 | { | |
382 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; | |
383 | ||
384 | return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST; | |
385 | } | |
386 | ||
6b811d43 | 387 | #define DCCP_PKT_WITHOUT_ACK_SEQ (UINT48_MAX << 2) |
7c657876 ACM |
388 | |
389 | static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss) | |
390 | { | |
7690af3f ACM |
391 | struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh + |
392 | sizeof(*dh)); | |
60fe62e7 AB |
393 | dh->dccph_seq2 = 0; |
394 | dh->dccph_seq = htons((gss >> 32) & 0xfffff); | |
7c657876 ACM |
395 | dhx->dccph_seq_low = htonl(gss & 0xffffffff); |
396 | } | |
397 | ||
7690af3f ACM |
398 | static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack, |
399 | const u64 gsr) | |
7c657876 | 400 | { |
60fe62e7 AB |
401 | dhack->dccph_reserved1 = 0; |
402 | dhack->dccph_ack_nr_high = htons(gsr >> 32); | |
7c657876 ACM |
403 | dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff); |
404 | } | |
405 | ||
406 | static inline void dccp_update_gsr(struct sock *sk, u64 seq) | |
407 | { | |
408 | struct dccp_sock *dp = dccp_sk(sk); | |
7c657876 | 409 | |
763dadd4 SJ |
410 | if (after48(seq, dp->dccps_gsr)) |
411 | dp->dccps_gsr = seq; | |
792b4878 GR |
412 | /* Sequence validity window depends on remote Sequence Window (7.5.1) */ |
413 | dp->dccps_swl = SUB48(ADD48(dp->dccps_gsr, 1), dp->dccps_r_seq_win / 4); | |
0b53d460 GR |
414 | /* |
415 | * Adjust SWL so that it is not below ISR. In contrast to RFC 4340, | |
416 | * 7.5.1 we perform this check beyond the initial handshake: W/W' are | |
417 | * always > 32, so for the first W/W' packets in the lifetime of a | |
418 | * connection we always have to adjust SWL. | |
419 | * A second reason why we are doing this is that the window depends on | |
420 | * the feature-remote value of Sequence Window: nothing stops the peer | |
421 | * from updating this value while we are busy adjusting SWL for the | |
422 | * first W packets (we would have to count from scratch again then). | |
423 | * Therefore it is safer to always make sure that the Sequence Window | |
424 | * is not artificially extended by a peer who grows SWL downwards by | |
425 | * continually updating the feature-remote Sequence-Window. | |
426 | * If sequence numbers wrap it is bad luck. But that will take a while | |
427 | * (48 bit), and this measure prevents Sequence-number attacks. | |
428 | */ | |
429 | if (before48(dp->dccps_swl, dp->dccps_isr)) | |
430 | dp->dccps_swl = dp->dccps_isr; | |
792b4878 | 431 | dp->dccps_swh = ADD48(dp->dccps_gsr, (3 * dp->dccps_r_seq_win) / 4); |
7c657876 ACM |
432 | } |
433 | ||
434 | static inline void dccp_update_gss(struct sock *sk, u64 seq) | |
435 | { | |
436 | struct dccp_sock *dp = dccp_sk(sk); | |
7c657876 | 437 | |
792b4878 GR |
438 | dp->dccps_gss = seq; |
439 | /* Ack validity window depends on local Sequence Window value (7.5.1) */ | |
440 | dp->dccps_awl = SUB48(ADD48(dp->dccps_gss, 1), dp->dccps_l_seq_win); | |
0b53d460 GR |
441 | /* Adjust AWL so that it is not below ISS - see comment above for SWL */ |
442 | if (before48(dp->dccps_awl, dp->dccps_iss)) | |
443 | dp->dccps_awl = dp->dccps_iss; | |
792b4878 | 444 | dp->dccps_awh = dp->dccps_gss; |
7c657876 | 445 | } |
c9eaf173 | 446 | |
b3d14bff GR |
447 | static inline int dccp_ackvec_pending(const struct sock *sk) |
448 | { | |
449 | return dccp_sk(sk)->dccps_hc_rx_ackvec != NULL && | |
450 | !dccp_ackvec_is_empty(dccp_sk(sk)->dccps_hc_rx_ackvec); | |
451 | } | |
452 | ||
ae31c339 ACM |
453 | static inline int dccp_ack_pending(const struct sock *sk) |
454 | { | |
b3d14bff | 455 | return dccp_ackvec_pending(sk) || inet_csk_ack_scheduled(sk); |
ae31c339 | 456 | } |
7c657876 | 457 | |
a402a5aa JP |
458 | int dccp_feat_signal_nn_change(struct sock *sk, u8 feat, u64 nn_val); |
459 | int dccp_feat_finalise_settings(struct dccp_sock *dp); | |
460 | int dccp_feat_server_ccid_dependencies(struct dccp_request_sock *dreq); | |
461 | int dccp_feat_insert_opts(struct dccp_sock*, struct dccp_request_sock*, | |
462 | struct sk_buff *skb); | |
463 | int dccp_feat_activate_values(struct sock *sk, struct list_head *fn); | |
464 | void dccp_feat_list_purge(struct list_head *fn_list); | |
465 | ||
466 | int dccp_insert_options(struct sock *sk, struct sk_buff *skb); | |
467 | int dccp_insert_options_rsk(struct dccp_request_sock *, struct sk_buff *); | |
a402a5aa JP |
468 | u32 dccp_timestamp(void); |
469 | void dccp_timestamping_init(void); | |
470 | int dccp_insert_option(struct sk_buff *skb, unsigned char option, | |
471 | const void *value, unsigned char len); | |
7c657876 | 472 | |
e55d912f | 473 | #ifdef CONFIG_SYSCTL |
a402a5aa JP |
474 | int dccp_sysctl_init(void); |
475 | void dccp_sysctl_exit(void); | |
e55d912f ACM |
476 | #else |
477 | static inline int dccp_sysctl_init(void) | |
478 | { | |
479 | return 0; | |
480 | } | |
481 | ||
482 | static inline void dccp_sysctl_exit(void) | |
483 | { | |
484 | } | |
485 | #endif | |
486 | ||
7c657876 | 487 | #endif /* _DCCP_H */ |