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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 | 43 | #else |
58434616 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 | ||
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 | ||
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 | ||
0aec51c8 GR |
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) | |
6b811d43 | 123 | { |
0aec51c8 GR |
124 | u64 delta = SUB48(seqno2, seqno1); |
125 | ||
126 | return TO_SIGNED48(delta); | |
6b811d43 GR |
127 | } |
128 | ||
7c657876 | 129 | /* is seq1 < seq2 ? */ |
a10cedd4 | 130 | static inline int before48(const u64 seq1, const u64 seq2) |
7c657876 | 131 | { |
d52de17b | 132 | return (s64)((seq2 << 16) - (seq1 << 16)) > 0; |
7c657876 ACM |
133 | } |
134 | ||
135 | /* is seq1 > seq2 ? */ | |
d52de17b | 136 | #define after48(seq1, seq2) before48(seq2, seq1) |
7c657876 ACM |
137 | |
138 | /* is seq2 <= seq1 <= seq3 ? */ | |
a10cedd4 | 139 | static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3) |
7c657876 ACM |
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 | ||
2013c7e3 | 149 | /** |
d196c9a5 IC |
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' | |
2013c7e3 | 153 | * @ndp: NDP count on packet with sequence number @s2 |
2013c7e3 | 154 | */ |
d196c9a5 | 155 | static inline u64 dccp_loss_count(const u64 s1, const u64 s2, const u64 ndp) |
2013c7e3 GR |
156 | { |
157 | s64 delta = dccp_delta_seqno(s1, s2); | |
158 | ||
547b792c | 159 | WARN_ON(delta < 0); |
d196c9a5 IC |
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; | |
2013c7e3 GR |
171 | } |
172 | ||
7c657876 ACM |
173 | enum { |
174 | DCCP_MIB_NUM = 0, | |
175 | DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */ | |
176 | DCCP_MIB_ESTABRESETS, /* EstabResets */ | |
177 | DCCP_MIB_CURRESTAB, /* CurrEstab */ | |
c9eaf173 | 178 | DCCP_MIB_OUTSEGS, /* OutSegs */ |
7c657876 ACM |
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]; | |
ec733b15 | 195 | }; |
7c657876 ACM |
196 | |
197 | DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics); | |
aa62d76b | 198 | #define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field) |
13415e46 | 199 | #define __DCCP_INC_STATS(field) __SNMP_INC_STATS(dccp_statistics, field) |
aa62d76b | 200 | #define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field) |
7c657876 | 201 | |
6f4e5fff GR |
202 | /* |
203 | * Checksumming routines | |
204 | */ | |
e961811f | 205 | static inline unsigned int dccp_csum_coverage(const struct sk_buff *skb) |
6f4e5fff GR |
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 | { | |
e961811f | 216 | unsigned int cov = dccp_csum_coverage(skb); |
6f4e5fff GR |
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 | ||
a402a5aa | 224 | void dccp_v4_send_check(struct sock *sk, struct sk_buff *skb); |
6f4e5fff | 225 | |
a402a5aa | 226 | int dccp_retransmit_skb(struct sock *sk); |
7c657876 | 227 | |
a402a5aa | 228 | void dccp_send_ack(struct sock *sk); |
a00e7444 | 229 | void dccp_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb, |
a402a5aa | 230 | struct request_sock *rsk); |
8a73cd09 | 231 | |
a402a5aa JP |
232 | void dccp_send_sync(struct sock *sk, const u64 seq, |
233 | const enum dccp_pkt_type pkt_type); | |
7c657876 | 234 | |
871a2c16 TG |
235 | /* |
236 | * TX Packet Dequeueing Interface | |
237 | */ | |
a402a5aa JP |
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); | |
871a2c16 TG |
244 | |
245 | /* | |
246 | * TX Packet Output and TX Timers | |
247 | */ | |
a402a5aa JP |
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); | |
27258ee5 | 251 | |
a402a5aa | 252 | void dccp_init_xmit_timers(struct sock *sk); |
7c657876 ACM |
253 | static inline void dccp_clear_xmit_timers(struct sock *sk) |
254 | { | |
255 | inet_csk_clear_xmit_timers(sk); | |
256 | } | |
257 | ||
a402a5aa | 258 | unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu); |
7c657876 | 259 | |
a402a5aa | 260 | const char *dccp_packet_name(const int type); |
7c657876 | 261 | |
a402a5aa JP |
262 | void dccp_set_state(struct sock *sk, const int state); |
263 | void dccp_done(struct sock *sk); | |
7c657876 | 264 | |
a402a5aa JP |
265 | int dccp_reqsk_init(struct request_sock *rq, struct dccp_sock const *dp, |
266 | struct sk_buff const *skb); | |
7c657876 | 267 | |
a402a5aa | 268 | int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb); |
7c657876 | 269 | |
54105f98 | 270 | struct sock *dccp_create_openreq_child(const struct sock *sk, |
a402a5aa JP |
271 | const struct request_sock *req, |
272 | const struct sk_buff *skb); | |
7c657876 | 273 | |
a402a5aa | 274 | int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb); |
7c657876 | 275 | |
0c27171e | 276 | struct sock *dccp_v4_request_recv_sock(const struct sock *sk, struct sk_buff *skb, |
a402a5aa | 277 | struct request_sock *req, |
5e0724d0 ED |
278 | struct dst_entry *dst, |
279 | struct request_sock *req_unhash, | |
280 | bool *own_req); | |
a402a5aa | 281 | struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb, |
52452c54 | 282 | struct request_sock *req); |
7c657876 | 283 | |
a402a5aa JP |
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); | |
7c657876 | 290 | |
a402a5aa JP |
291 | int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized); |
292 | void dccp_destroy_sock(struct sock *sk); | |
f21e68ca | 293 | |
a402a5aa | 294 | void dccp_close(struct sock *sk, long timeout); |
802885fc | 295 | struct sk_buff *dccp_make_response(const struct sock *sk, struct dst_entry *dst, |
a402a5aa | 296 | struct request_sock *req); |
7c657876 | 297 | |
a402a5aa JP |
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); | |
3fdadf7d | 304 | #ifdef CONFIG_COMPAT |
a402a5aa JP |
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); | |
3fdadf7d | 309 | #endif |
a402a5aa | 310 | int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg); |
1b784140 YX |
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); | |
a402a5aa JP |
314 | void dccp_shutdown(struct sock *sk, int how); |
315 | int inet_dccp_listen(struct socket *sock, int backlog); | |
a11e1d43 LT |
316 | __poll_t dccp_poll(struct file *file, struct socket *sock, |
317 | poll_table *wait); | |
a402a5aa | 318 | int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); |
85645bab | 319 | void dccp_req_err(struct sock *sk, u64 seq); |
a402a5aa JP |
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); | |
f21e68ca | 326 | |
45ae74f5 | 327 | static inline bool dccp_bad_service_code(const struct sock *sk, |
60fe62e7 | 328 | const __be32 service) |
f21e68ca ACM |
329 | { |
330 | const struct dccp_sock *dp = dccp_sk(sk); | |
331 | ||
332 | if (dp->dccps_service == service) | |
45ae74f5 | 333 | return false; |
f21e68ca ACM |
334 | return !dccp_list_has_service(dp->dccps_service_list, service); |
335 | } | |
7c657876 | 336 | |
0430ee34 GR |
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 | |
2c53040f | 346 | * |
0430ee34 GR |
347 | * This is used for transmission as well as for reception. |
348 | */ | |
7c657876 | 349 | struct dccp_skb_cb { |
028b0275 PM |
350 | union { |
351 | struct inet_skb_parm h4; | |
dfd56b8b | 352 | #if IS_ENABLED(CONFIG_IPV6) |
028b0275 PM |
353 | struct inet6_skb_parm h6; |
354 | #endif | |
355 | } header; | |
67e6b629 ACM |
356 | __u8 dccpd_type:4; |
357 | __u8 dccpd_ccval:4; | |
0430ee34 GR |
358 | __u8 dccpd_reset_code, |
359 | dccpd_reset_data[3]; | |
67e6b629 | 360 | __u16 dccpd_opt_len; |
7c657876 ACM |
361 | __u64 dccpd_seq; |
362 | __u64 dccpd_ack_seq; | |
7c657876 ACM |
363 | }; |
364 | ||
365 | #define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0])) | |
366 | ||
2180c41c | 367 | /* RFC 4340, sec. 7.7 */ |
7c657876 ACM |
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 | ||
2180c41c GR |
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 | ||
7c657876 ACM |
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 | ||
6b811d43 | 398 | #define DCCP_PKT_WITHOUT_ACK_SEQ (UINT48_MAX << 2) |
7c657876 ACM |
399 | |
400 | static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss) | |
401 | { | |
7690af3f ACM |
402 | struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh + |
403 | sizeof(*dh)); | |
60fe62e7 AB |
404 | dh->dccph_seq2 = 0; |
405 | dh->dccph_seq = htons((gss >> 32) & 0xfffff); | |
7c657876 ACM |
406 | dhx->dccph_seq_low = htonl(gss & 0xffffffff); |
407 | } | |
408 | ||
7690af3f ACM |
409 | static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack, |
410 | const u64 gsr) | |
7c657876 | 411 | { |
60fe62e7 AB |
412 | dhack->dccph_reserved1 = 0; |
413 | dhack->dccph_ack_nr_high = htons(gsr >> 32); | |
7c657876 ACM |
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); | |
7c657876 | 420 | |
763dadd4 SJ |
421 | if (after48(seq, dp->dccps_gsr)) |
422 | dp->dccps_gsr = seq; | |
792b4878 GR |
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); | |
0b53d460 GR |
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; | |
792b4878 | 442 | dp->dccps_swh = ADD48(dp->dccps_gsr, (3 * dp->dccps_r_seq_win) / 4); |
7c657876 ACM |
443 | } |
444 | ||
445 | static inline void dccp_update_gss(struct sock *sk, u64 seq) | |
446 | { | |
447 | struct dccp_sock *dp = dccp_sk(sk); | |
7c657876 | 448 | |
792b4878 GR |
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); | |
0b53d460 GR |
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; | |
792b4878 | 455 | dp->dccps_awh = dp->dccps_gss; |
7c657876 | 456 | } |
c9eaf173 | 457 | |
b3d14bff GR |
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 | ||
ae31c339 ACM |
464 | static inline int dccp_ack_pending(const struct sock *sk) |
465 | { | |
b3d14bff | 466 | return dccp_ackvec_pending(sk) || inet_csk_ack_scheduled(sk); |
ae31c339 | 467 | } |
7c657876 | 468 | |
a402a5aa JP |
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 *); | |
a402a5aa JP |
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); | |
7c657876 | 483 | |
e55d912f | 484 | #ifdef CONFIG_SYSCTL |
a402a5aa JP |
485 | int dccp_sysctl_init(void); |
486 | void dccp_sysctl_exit(void); | |
e55d912f ACM |
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 | ||
7c657876 | 498 | #endif /* _DCCP_H */ |