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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> | |
9823b7b5 | 16 | #include <linux/ktime.h> |
7c657876 ACM |
17 | #include <net/snmp.h> |
18 | #include <net/sock.h> | |
19 | #include <net/tcp.h> | |
ae31c339 | 20 | #include "ackvec.h" |
7c657876 | 21 | |
59348b19 GR |
22 | /* |
23 | * DCCP - specific warning and debugging macros. | |
24 | */ | |
25 | #define DCCP_WARN(fmt, a...) LIMIT_NETDEBUG(KERN_WARNING "%s: " fmt, \ | |
0dc47877 | 26 | __func__, ##a) |
59348b19 | 27 | #define DCCP_CRIT(fmt, a...) printk(KERN_CRIT fmt " at %s:%d/%s()\n", ##a, \ |
0dc47877 | 28 | __FILE__, __LINE__, __func__) |
59348b19 GR |
29 | #define DCCP_BUG(a...) do { DCCP_CRIT("BUG: " a); dump_stack(); } while(0) |
30 | #define DCCP_BUG_ON(cond) do { if (unlikely((cond) != 0)) \ | |
31 | DCCP_BUG("\"%s\" holds (exception!)", \ | |
32 | __stringify(cond)); \ | |
3c695262 GR |
33 | } while (0) |
34 | ||
84116716 GR |
35 | #define DCCP_PRINTK(enable, fmt, args...) do { if (enable) \ |
36 | printk(fmt, ##args); \ | |
c9eaf173 | 37 | } while(0) |
84116716 | 38 | #define DCCP_PR_DEBUG(enable, fmt, a...) DCCP_PRINTK(enable, KERN_DEBUG \ |
0dc47877 | 39 | "%s: " fmt, __func__, ##a) |
84116716 | 40 | |
725ba8ee | 41 | #ifdef CONFIG_IP_DCCP_DEBUG |
eb939922 | 42 | extern bool dccp_debug; |
84116716 GR |
43 | #define dccp_pr_debug(format, a...) DCCP_PR_DEBUG(dccp_debug, format, ##a) |
44 | #define dccp_pr_debug_cat(format, a...) DCCP_PRINTK(dccp_debug, format, ##a) | |
f3f3abb6 | 45 | #define dccp_debug(fmt, a...) dccp_pr_debug_cat(KERN_DEBUG fmt, ##a) |
7c657876 ACM |
46 | #else |
47 | #define dccp_pr_debug(format, a...) | |
48 | #define dccp_pr_debug_cat(format, a...) | |
f3f3abb6 | 49 | #define dccp_debug(format, a...) |
7c657876 ACM |
50 | #endif |
51 | ||
52 | extern struct inet_hashinfo dccp_hashinfo; | |
53 | ||
dd24c001 | 54 | extern struct percpu_counter dccp_orphan_count; |
7c657876 ACM |
55 | |
56 | extern void dccp_time_wait(struct sock *sk, int state, int timeo); | |
57 | ||
60361be1 GR |
58 | /* |
59 | * Set safe upper bounds for header and option length. Since Data Offset is 8 | |
60 | * bits (RFC 4340, sec. 5.1), the total header length can never be more than | |
61 | * 4 * 255 = 1020 bytes. The largest possible header length is 28 bytes (X=1): | |
62 | * - DCCP-Response with ACK Subheader and 4 bytes of Service code OR | |
63 | * - DCCP-Reset with ACK Subheader and 4 bytes of Reset Code fields | |
64 | * Hence a safe upper bound for the maximum option length is 1020-28 = 992 | |
65 | */ | |
86739fb9 | 66 | #define MAX_DCCP_SPECIFIC_HEADER (255 * sizeof(uint32_t)) |
60361be1 GR |
67 | #define DCCP_MAX_PACKET_HDR 28 |
68 | #define DCCP_MAX_OPT_LEN (MAX_DCCP_SPECIFIC_HEADER - DCCP_MAX_PACKET_HDR) | |
69 | #define MAX_DCCP_HEADER (MAX_DCCP_SPECIFIC_HEADER + MAX_HEADER) | |
7c657876 | 70 | |
86739fb9 GR |
71 | /* Upper bound for initial feature-negotiation overhead (padded to 32 bits) */ |
72 | #define DCCP_FEATNEG_OVERHEAD (32 * sizeof(uint32_t)) | |
73 | ||
7c657876 ACM |
74 | #define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT |
75 | * state, about 60 seconds */ | |
76 | ||
0e64e94e | 77 | /* RFC 1122, 4.2.3.1 initial RTO value */ |
95c96174 | 78 | #define DCCP_TIMEOUT_INIT ((unsigned int)(3 * HZ)) |
7c657876 | 79 | |
28be5440 GR |
80 | /* |
81 | * The maximum back-off value for retransmissions. This is needed for | |
82 | * - retransmitting client-Requests (sec. 8.1.1), | |
83 | * - retransmitting Close/CloseReq when closing (sec. 8.3), | |
84 | * - feature-negotiation retransmission (sec. 6.6.3), | |
85 | * - Acks in client-PARTOPEN state (sec. 8.1.5). | |
86 | */ | |
95c96174 | 87 | #define DCCP_RTO_MAX ((unsigned int)(64 * HZ)) |
4712a792 | 88 | |
954c2db8 GR |
89 | /* |
90 | * RTT sampling: sanity bounds and fallback RTT value from RFC 4340, section 3.4 | |
91 | */ | |
4712a792 | 92 | #define DCCP_SANE_RTT_MIN 100 |
954c2db8 GR |
93 | #define DCCP_FALLBACK_RTT (USEC_PER_SEC / 5) |
94 | #define DCCP_SANE_RTT_MAX (3 * USEC_PER_SEC) | |
4712a792 | 95 | |
2e2e9e92 GR |
96 | /* sysctl variables for DCCP */ |
97 | extern int sysctl_dccp_request_retries; | |
98 | extern int sysctl_dccp_retries1; | |
99 | extern int sysctl_dccp_retries2; | |
b1308dc0 | 100 | extern int sysctl_dccp_tx_qlen; |
a94f0f97 | 101 | extern int sysctl_dccp_sync_ratelimit; |
2e2e9e92 | 102 | |
6b811d43 GR |
103 | /* |
104 | * 48-bit sequence number arithmetic (signed and unsigned) | |
105 | */ | |
106 | #define INT48_MIN 0x800000000000LL /* 2^47 */ | |
107 | #define UINT48_MAX 0xFFFFFFFFFFFFLL /* 2^48 - 1 */ | |
108 | #define COMPLEMENT48(x) (0x1000000000000LL - (x)) /* 2^48 - x */ | |
109 | #define TO_SIGNED48(x) (((x) < INT48_MIN)? (x) : -COMPLEMENT48( (x))) | |
110 | #define TO_UNSIGNED48(x) (((x) >= 0)? (x) : COMPLEMENT48(-(x))) | |
111 | #define ADD48(a, b) (((a) + (b)) & UINT48_MAX) | |
112 | #define SUB48(a, b) ADD48((a), COMPLEMENT48(b)) | |
113 | ||
114 | static inline void dccp_set_seqno(u64 *seqno, u64 value) | |
115 | { | |
116 | *seqno = value & UINT48_MAX; | |
117 | } | |
118 | ||
119 | static inline void dccp_inc_seqno(u64 *seqno) | |
120 | { | |
121 | *seqno = ADD48(*seqno, 1); | |
122 | } | |
123 | ||
0aec51c8 GR |
124 | /* signed mod-2^48 distance: pos. if seqno1 < seqno2, neg. if seqno1 > seqno2 */ |
125 | static inline s64 dccp_delta_seqno(const u64 seqno1, const u64 seqno2) | |
6b811d43 | 126 | { |
0aec51c8 GR |
127 | u64 delta = SUB48(seqno2, seqno1); |
128 | ||
129 | return TO_SIGNED48(delta); | |
6b811d43 GR |
130 | } |
131 | ||
7c657876 | 132 | /* is seq1 < seq2 ? */ |
a10cedd4 | 133 | static inline int before48(const u64 seq1, const u64 seq2) |
7c657876 | 134 | { |
d52de17b | 135 | return (s64)((seq2 << 16) - (seq1 << 16)) > 0; |
7c657876 ACM |
136 | } |
137 | ||
138 | /* is seq1 > seq2 ? */ | |
d52de17b | 139 | #define after48(seq1, seq2) before48(seq2, seq1) |
7c657876 ACM |
140 | |
141 | /* is seq2 <= seq1 <= seq3 ? */ | |
a10cedd4 | 142 | static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3) |
7c657876 ACM |
143 | { |
144 | return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16); | |
145 | } | |
146 | ||
147 | static inline u64 max48(const u64 seq1, const u64 seq2) | |
148 | { | |
149 | return after48(seq1, seq2) ? seq1 : seq2; | |
150 | } | |
151 | ||
2013c7e3 | 152 | /** |
d196c9a5 IC |
153 | * dccp_loss_count - Approximate the number of lost data packets in a burst loss |
154 | * @s1: last known sequence number before the loss ('hole') | |
155 | * @s2: first sequence number seen after the 'hole' | |
2013c7e3 | 156 | * @ndp: NDP count on packet with sequence number @s2 |
2013c7e3 | 157 | */ |
d196c9a5 | 158 | static inline u64 dccp_loss_count(const u64 s1, const u64 s2, const u64 ndp) |
2013c7e3 GR |
159 | { |
160 | s64 delta = dccp_delta_seqno(s1, s2); | |
161 | ||
547b792c | 162 | WARN_ON(delta < 0); |
d196c9a5 IC |
163 | delta -= ndp + 1; |
164 | ||
165 | return delta > 0 ? delta : 0; | |
166 | } | |
167 | ||
168 | /** | |
169 | * dccp_loss_free - Evaluate condition for data loss from RFC 4340, 7.7.1 | |
170 | */ | |
171 | static inline bool dccp_loss_free(const u64 s1, const u64 s2, const u64 ndp) | |
172 | { | |
173 | return dccp_loss_count(s1, s2, ndp) == 0; | |
2013c7e3 GR |
174 | } |
175 | ||
7c657876 ACM |
176 | enum { |
177 | DCCP_MIB_NUM = 0, | |
178 | DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */ | |
179 | DCCP_MIB_ESTABRESETS, /* EstabResets */ | |
180 | DCCP_MIB_CURRESTAB, /* CurrEstab */ | |
c9eaf173 | 181 | DCCP_MIB_OUTSEGS, /* OutSegs */ |
7c657876 ACM |
182 | DCCP_MIB_OUTRSTS, |
183 | DCCP_MIB_ABORTONTIMEOUT, | |
184 | DCCP_MIB_TIMEOUTS, | |
185 | DCCP_MIB_ABORTFAILED, | |
186 | DCCP_MIB_PASSIVEOPENS, | |
187 | DCCP_MIB_ATTEMPTFAILS, | |
188 | DCCP_MIB_OUTDATAGRAMS, | |
189 | DCCP_MIB_INERRS, | |
190 | DCCP_MIB_OPTMANDATORYERROR, | |
191 | DCCP_MIB_INVALIDOPT, | |
192 | __DCCP_MIB_MAX | |
193 | }; | |
194 | ||
195 | #define DCCP_MIB_MAX __DCCP_MIB_MAX | |
196 | struct dccp_mib { | |
197 | unsigned long mibs[DCCP_MIB_MAX]; | |
ec733b15 | 198 | }; |
7c657876 ACM |
199 | |
200 | DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics); | |
7690af3f ACM |
201 | #define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field) |
202 | #define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field) | |
7690af3f | 203 | #define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field) |
7c657876 | 204 | |
6f4e5fff GR |
205 | /* |
206 | * Checksumming routines | |
207 | */ | |
e961811f | 208 | static inline unsigned int dccp_csum_coverage(const struct sk_buff *skb) |
6f4e5fff GR |
209 | { |
210 | const struct dccp_hdr* dh = dccp_hdr(skb); | |
211 | ||
212 | if (dh->dccph_cscov == 0) | |
213 | return skb->len; | |
214 | return (dh->dccph_doff + dh->dccph_cscov - 1) * sizeof(u32); | |
215 | } | |
216 | ||
217 | static inline void dccp_csum_outgoing(struct sk_buff *skb) | |
218 | { | |
e961811f | 219 | unsigned int cov = dccp_csum_coverage(skb); |
6f4e5fff GR |
220 | |
221 | if (cov >= skb->len) | |
222 | dccp_hdr(skb)->dccph_cscov = 0; | |
223 | ||
224 | skb->csum = skb_checksum(skb, 0, (cov > skb->len)? skb->len : cov, 0); | |
225 | } | |
226 | ||
bb296246 | 227 | extern void dccp_v4_send_check(struct sock *sk, struct sk_buff *skb); |
6f4e5fff | 228 | |
59435444 | 229 | extern int dccp_retransmit_skb(struct sock *sk); |
7c657876 | 230 | |
7c657876 | 231 | extern void dccp_send_ack(struct sock *sk); |
6edafaaf GJ |
232 | extern void dccp_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
233 | struct request_sock *rsk); | |
8a73cd09 | 234 | |
e92ae93a ACM |
235 | extern void dccp_send_sync(struct sock *sk, const u64 seq, |
236 | const enum dccp_pkt_type pkt_type); | |
7c657876 | 237 | |
871a2c16 TG |
238 | /* |
239 | * TX Packet Dequeueing Interface | |
240 | */ | |
241 | extern void dccp_qpolicy_push(struct sock *sk, struct sk_buff *skb); | |
242 | extern bool dccp_qpolicy_full(struct sock *sk); | |
243 | extern void dccp_qpolicy_drop(struct sock *sk, struct sk_buff *skb); | |
244 | extern struct sk_buff *dccp_qpolicy_top(struct sock *sk); | |
245 | extern struct sk_buff *dccp_qpolicy_pop(struct sock *sk); | |
04910265 | 246 | extern bool dccp_qpolicy_param_ok(struct sock *sk, __be32 param); |
871a2c16 TG |
247 | |
248 | /* | |
249 | * TX Packet Output and TX Timers | |
250 | */ | |
b1fcf55e GR |
251 | extern void dccp_write_xmit(struct sock *sk); |
252 | extern void dccp_write_space(struct sock *sk); | |
253 | extern void dccp_flush_write_queue(struct sock *sk, long *time_budget); | |
27258ee5 | 254 | |
7c657876 ACM |
255 | extern void dccp_init_xmit_timers(struct sock *sk); |
256 | static inline void dccp_clear_xmit_timers(struct sock *sk) | |
257 | { | |
258 | inet_csk_clear_xmit_timers(sk); | |
259 | } | |
260 | ||
261 | extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu); | |
262 | ||
263 | extern const char *dccp_packet_name(const int type); | |
7c657876 | 264 | |
c25a18ba ACM |
265 | extern void dccp_set_state(struct sock *sk, const int state); |
266 | extern void dccp_done(struct sock *sk); | |
7c657876 | 267 | |
ac75773c GR |
268 | extern int dccp_reqsk_init(struct request_sock *rq, struct dccp_sock const *dp, |
269 | struct sk_buff const *skb); | |
7c657876 | 270 | |
7c657876 ACM |
271 | extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb); |
272 | ||
273 | extern struct sock *dccp_create_openreq_child(struct sock *sk, | |
274 | const struct request_sock *req, | |
275 | const struct sk_buff *skb); | |
276 | ||
277 | extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb); | |
278 | ||
7c657876 ACM |
279 | extern struct sock *dccp_v4_request_recv_sock(struct sock *sk, |
280 | struct sk_buff *skb, | |
281 | struct request_sock *req, | |
282 | struct dst_entry *dst); | |
283 | extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb, | |
284 | struct request_sock *req, | |
285 | struct request_sock **prev); | |
286 | ||
287 | extern int dccp_child_process(struct sock *parent, struct sock *child, | |
288 | struct sk_buff *skb); | |
289 | extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb, | |
95c96174 | 290 | struct dccp_hdr *dh, unsigned int len); |
7c657876 | 291 | extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb, |
95c96174 | 292 | const struct dccp_hdr *dh, const unsigned int len); |
7c657876 | 293 | |
72478873 | 294 | extern int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized); |
7d06b2e0 | 295 | extern void dccp_destroy_sock(struct sock *sk); |
f21e68ca | 296 | |
7c657876 ACM |
297 | extern void dccp_close(struct sock *sk, long timeout); |
298 | extern struct sk_buff *dccp_make_response(struct sock *sk, | |
299 | struct dst_entry *dst, | |
300 | struct request_sock *req); | |
301 | ||
302 | extern int dccp_connect(struct sock *sk); | |
303 | extern int dccp_disconnect(struct sock *sk, int flags); | |
304 | extern int dccp_getsockopt(struct sock *sk, int level, int optname, | |
a1d3a355 ACM |
305 | char __user *optval, int __user *optlen); |
306 | extern int dccp_setsockopt(struct sock *sk, int level, int optname, | |
b7058842 | 307 | char __user *optval, unsigned int optlen); |
3fdadf7d DM |
308 | #ifdef CONFIG_COMPAT |
309 | extern int compat_dccp_getsockopt(struct sock *sk, | |
310 | int level, int optname, | |
311 | char __user *optval, int __user *optlen); | |
312 | extern int compat_dccp_setsockopt(struct sock *sk, | |
313 | int level, int optname, | |
b7058842 | 314 | char __user *optval, unsigned int optlen); |
3fdadf7d | 315 | #endif |
7c657876 | 316 | extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg); |
7690af3f ACM |
317 | extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, |
318 | struct msghdr *msg, size_t size); | |
7c657876 ACM |
319 | extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, |
320 | struct msghdr *msg, size_t len, int nonblock, | |
321 | int flags, int *addr_len); | |
7c657876 | 322 | extern void dccp_shutdown(struct sock *sk, int how); |
f21e68ca ACM |
323 | extern int inet_dccp_listen(struct socket *sock, int backlog); |
324 | extern unsigned int dccp_poll(struct file *file, struct socket *sock, | |
325 | poll_table *wait); | |
f21e68ca ACM |
326 | extern int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, |
327 | int addr_len); | |
7c657876 | 328 | |
7630f026 | 329 | extern struct sk_buff *dccp_ctl_make_reset(struct sock *sk, |
e356d37a | 330 | struct sk_buff *skb); |
017487d7 | 331 | extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code); |
7ad07e7c | 332 | extern void dccp_send_close(struct sock *sk, const int active); |
f21e68ca | 333 | extern int dccp_invalid_packet(struct sk_buff *skb); |
3393da82 | 334 | extern u32 dccp_sample_rtt(struct sock *sk, long delta); |
f21e68ca ACM |
335 | |
336 | static inline int dccp_bad_service_code(const struct sock *sk, | |
60fe62e7 | 337 | const __be32 service) |
f21e68ca ACM |
338 | { |
339 | const struct dccp_sock *dp = dccp_sk(sk); | |
340 | ||
341 | if (dp->dccps_service == service) | |
342 | return 0; | |
343 | return !dccp_list_has_service(dp->dccps_service_list, service); | |
344 | } | |
7c657876 | 345 | |
0430ee34 GR |
346 | /** |
347 | * dccp_skb_cb - DCCP per-packet control information | |
348 | * @dccpd_type: one of %dccp_pkt_type (or unknown) | |
349 | * @dccpd_ccval: CCVal field (5.1), see e.g. RFC 4342, 8.1 | |
350 | * @dccpd_reset_code: one of %dccp_reset_codes | |
351 | * @dccpd_reset_data: Data1..3 fields (depend on @dccpd_reset_code) | |
352 | * @dccpd_opt_len: total length of all options (5.8) in the packet | |
353 | * @dccpd_seq: sequence number | |
354 | * @dccpd_ack_seq: acknowledgment number subheader field value | |
2c53040f | 355 | * |
0430ee34 GR |
356 | * This is used for transmission as well as for reception. |
357 | */ | |
7c657876 | 358 | struct dccp_skb_cb { |
028b0275 PM |
359 | union { |
360 | struct inet_skb_parm h4; | |
dfd56b8b | 361 | #if IS_ENABLED(CONFIG_IPV6) |
028b0275 PM |
362 | struct inet6_skb_parm h6; |
363 | #endif | |
364 | } header; | |
67e6b629 ACM |
365 | __u8 dccpd_type:4; |
366 | __u8 dccpd_ccval:4; | |
0430ee34 GR |
367 | __u8 dccpd_reset_code, |
368 | dccpd_reset_data[3]; | |
67e6b629 | 369 | __u16 dccpd_opt_len; |
7c657876 ACM |
370 | __u64 dccpd_seq; |
371 | __u64 dccpd_ack_seq; | |
7c657876 ACM |
372 | }; |
373 | ||
374 | #define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0])) | |
375 | ||
2180c41c | 376 | /* RFC 4340, sec. 7.7 */ |
7c657876 ACM |
377 | static inline int dccp_non_data_packet(const struct sk_buff *skb) |
378 | { | |
379 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; | |
380 | ||
381 | return type == DCCP_PKT_ACK || | |
382 | type == DCCP_PKT_CLOSE || | |
383 | type == DCCP_PKT_CLOSEREQ || | |
384 | type == DCCP_PKT_RESET || | |
385 | type == DCCP_PKT_SYNC || | |
386 | type == DCCP_PKT_SYNCACK; | |
387 | } | |
388 | ||
2180c41c GR |
389 | /* RFC 4340, sec. 7.7 */ |
390 | static inline int dccp_data_packet(const struct sk_buff *skb) | |
391 | { | |
392 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; | |
393 | ||
394 | return type == DCCP_PKT_DATA || | |
395 | type == DCCP_PKT_DATAACK || | |
396 | type == DCCP_PKT_REQUEST || | |
397 | type == DCCP_PKT_RESPONSE; | |
398 | } | |
399 | ||
7c657876 ACM |
400 | static inline int dccp_packet_without_ack(const struct sk_buff *skb) |
401 | { | |
402 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; | |
403 | ||
404 | return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST; | |
405 | } | |
406 | ||
6b811d43 | 407 | #define DCCP_PKT_WITHOUT_ACK_SEQ (UINT48_MAX << 2) |
7c657876 ACM |
408 | |
409 | static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss) | |
410 | { | |
7690af3f ACM |
411 | struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh + |
412 | sizeof(*dh)); | |
60fe62e7 AB |
413 | dh->dccph_seq2 = 0; |
414 | dh->dccph_seq = htons((gss >> 32) & 0xfffff); | |
7c657876 ACM |
415 | dhx->dccph_seq_low = htonl(gss & 0xffffffff); |
416 | } | |
417 | ||
7690af3f ACM |
418 | static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack, |
419 | const u64 gsr) | |
7c657876 | 420 | { |
60fe62e7 AB |
421 | dhack->dccph_reserved1 = 0; |
422 | dhack->dccph_ack_nr_high = htons(gsr >> 32); | |
7c657876 ACM |
423 | dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff); |
424 | } | |
425 | ||
426 | static inline void dccp_update_gsr(struct sock *sk, u64 seq) | |
427 | { | |
428 | struct dccp_sock *dp = dccp_sk(sk); | |
7c657876 | 429 | |
763dadd4 SJ |
430 | if (after48(seq, dp->dccps_gsr)) |
431 | dp->dccps_gsr = seq; | |
792b4878 GR |
432 | /* Sequence validity window depends on remote Sequence Window (7.5.1) */ |
433 | dp->dccps_swl = SUB48(ADD48(dp->dccps_gsr, 1), dp->dccps_r_seq_win / 4); | |
0b53d460 GR |
434 | /* |
435 | * Adjust SWL so that it is not below ISR. In contrast to RFC 4340, | |
436 | * 7.5.1 we perform this check beyond the initial handshake: W/W' are | |
437 | * always > 32, so for the first W/W' packets in the lifetime of a | |
438 | * connection we always have to adjust SWL. | |
439 | * A second reason why we are doing this is that the window depends on | |
440 | * the feature-remote value of Sequence Window: nothing stops the peer | |
441 | * from updating this value while we are busy adjusting SWL for the | |
442 | * first W packets (we would have to count from scratch again then). | |
443 | * Therefore it is safer to always make sure that the Sequence Window | |
444 | * is not artificially extended by a peer who grows SWL downwards by | |
445 | * continually updating the feature-remote Sequence-Window. | |
446 | * If sequence numbers wrap it is bad luck. But that will take a while | |
447 | * (48 bit), and this measure prevents Sequence-number attacks. | |
448 | */ | |
449 | if (before48(dp->dccps_swl, dp->dccps_isr)) | |
450 | dp->dccps_swl = dp->dccps_isr; | |
792b4878 | 451 | dp->dccps_swh = ADD48(dp->dccps_gsr, (3 * dp->dccps_r_seq_win) / 4); |
7c657876 ACM |
452 | } |
453 | ||
454 | static inline void dccp_update_gss(struct sock *sk, u64 seq) | |
455 | { | |
456 | struct dccp_sock *dp = dccp_sk(sk); | |
7c657876 | 457 | |
792b4878 GR |
458 | dp->dccps_gss = seq; |
459 | /* Ack validity window depends on local Sequence Window value (7.5.1) */ | |
460 | dp->dccps_awl = SUB48(ADD48(dp->dccps_gss, 1), dp->dccps_l_seq_win); | |
0b53d460 GR |
461 | /* Adjust AWL so that it is not below ISS - see comment above for SWL */ |
462 | if (before48(dp->dccps_awl, dp->dccps_iss)) | |
463 | dp->dccps_awl = dp->dccps_iss; | |
792b4878 | 464 | dp->dccps_awh = dp->dccps_gss; |
7c657876 | 465 | } |
c9eaf173 | 466 | |
b3d14bff GR |
467 | static inline int dccp_ackvec_pending(const struct sock *sk) |
468 | { | |
469 | return dccp_sk(sk)->dccps_hc_rx_ackvec != NULL && | |
470 | !dccp_ackvec_is_empty(dccp_sk(sk)->dccps_hc_rx_ackvec); | |
471 | } | |
472 | ||
ae31c339 ACM |
473 | static inline int dccp_ack_pending(const struct sock *sk) |
474 | { | |
b3d14bff | 475 | return dccp_ackvec_pending(sk) || inet_csk_ack_scheduled(sk); |
ae31c339 | 476 | } |
7c657876 | 477 | |
d6916f87 | 478 | extern int dccp_feat_signal_nn_change(struct sock *sk, u8 feat, u64 nn_val); |
9eca0a47 | 479 | extern int dccp_feat_finalise_settings(struct dccp_sock *dp); |
0c116839 | 480 | extern int dccp_feat_server_ccid_dependencies(struct dccp_request_sock *dreq); |
0971d17c GR |
481 | extern int dccp_feat_insert_opts(struct dccp_sock*, struct dccp_request_sock*, |
482 | struct sk_buff *skb); | |
422d9cdc | 483 | extern int dccp_feat_activate_values(struct sock *sk, struct list_head *fn); |
61e6473e GR |
484 | extern void dccp_feat_list_purge(struct list_head *fn_list); |
485 | ||
2d0817d1 | 486 | extern int dccp_insert_options(struct sock *sk, struct sk_buff *skb); |
af3b867e | 487 | extern int dccp_insert_options_rsk(struct dccp_request_sock*, struct sk_buff*); |
a7d13fbf | 488 | extern int dccp_insert_option_elapsed_time(struct sk_buff *skb, u32 elapsed); |
4c70f383 GR |
489 | extern u32 dccp_timestamp(void); |
490 | extern void dccp_timestamping_init(void); | |
a7d13fbf GR |
491 | extern int dccp_insert_option(struct sk_buff *skb, unsigned char option, |
492 | const void *value, unsigned char len); | |
7c657876 | 493 | |
e55d912f ACM |
494 | #ifdef CONFIG_SYSCTL |
495 | extern int dccp_sysctl_init(void); | |
496 | extern void dccp_sysctl_exit(void); | |
497 | #else | |
498 | static inline int dccp_sysctl_init(void) | |
499 | { | |
500 | return 0; | |
501 | } | |
502 | ||
503 | static inline void dccp_sysctl_exit(void) | |
504 | { | |
505 | } | |
506 | #endif | |
507 | ||
7c657876 | 508 | #endif /* _DCCP_H */ |