Commit | Line | Data |
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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 |
7c657876 | 42 | extern int 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 */ |
7c657876 ACM |
78 | #define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ)) |
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 | */ | |
87 | #define DCCP_RTO_MAX ((unsigned)(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 | |
7c657876 ACM |
96 | /* Maximal interval between probes for local resources. */ |
97 | #define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U)) | |
98 | ||
2e2e9e92 GR |
99 | /* sysctl variables for DCCP */ |
100 | extern int sysctl_dccp_request_retries; | |
101 | extern int sysctl_dccp_retries1; | |
102 | extern int sysctl_dccp_retries2; | |
b1308dc0 | 103 | extern int sysctl_dccp_tx_qlen; |
a94f0f97 | 104 | extern int sysctl_dccp_sync_ratelimit; |
2e2e9e92 | 105 | |
6b811d43 GR |
106 | /* |
107 | * 48-bit sequence number arithmetic (signed and unsigned) | |
108 | */ | |
109 | #define INT48_MIN 0x800000000000LL /* 2^47 */ | |
110 | #define UINT48_MAX 0xFFFFFFFFFFFFLL /* 2^48 - 1 */ | |
111 | #define COMPLEMENT48(x) (0x1000000000000LL - (x)) /* 2^48 - x */ | |
112 | #define TO_SIGNED48(x) (((x) < INT48_MIN)? (x) : -COMPLEMENT48( (x))) | |
113 | #define TO_UNSIGNED48(x) (((x) >= 0)? (x) : COMPLEMENT48(-(x))) | |
114 | #define ADD48(a, b) (((a) + (b)) & UINT48_MAX) | |
115 | #define SUB48(a, b) ADD48((a), COMPLEMENT48(b)) | |
116 | ||
117 | static inline void dccp_set_seqno(u64 *seqno, u64 value) | |
118 | { | |
119 | *seqno = value & UINT48_MAX; | |
120 | } | |
121 | ||
122 | static inline void dccp_inc_seqno(u64 *seqno) | |
123 | { | |
124 | *seqno = ADD48(*seqno, 1); | |
125 | } | |
126 | ||
0aec51c8 GR |
127 | /* signed mod-2^48 distance: pos. if seqno1 < seqno2, neg. if seqno1 > seqno2 */ |
128 | static inline s64 dccp_delta_seqno(const u64 seqno1, const u64 seqno2) | |
6b811d43 | 129 | { |
0aec51c8 GR |
130 | u64 delta = SUB48(seqno2, seqno1); |
131 | ||
132 | return TO_SIGNED48(delta); | |
6b811d43 GR |
133 | } |
134 | ||
7c657876 | 135 | /* is seq1 < seq2 ? */ |
a10cedd4 | 136 | static inline int before48(const u64 seq1, const u64 seq2) |
7c657876 | 137 | { |
d52de17b | 138 | return (s64)((seq2 << 16) - (seq1 << 16)) > 0; |
7c657876 ACM |
139 | } |
140 | ||
141 | /* is seq1 > seq2 ? */ | |
d52de17b | 142 | #define after48(seq1, seq2) before48(seq2, seq1) |
7c657876 ACM |
143 | |
144 | /* is seq2 <= seq1 <= seq3 ? */ | |
a10cedd4 | 145 | static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3) |
7c657876 ACM |
146 | { |
147 | return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16); | |
148 | } | |
149 | ||
150 | static inline u64 max48(const u64 seq1, const u64 seq2) | |
151 | { | |
152 | return after48(seq1, seq2) ? seq1 : seq2; | |
153 | } | |
154 | ||
2013c7e3 GR |
155 | /** |
156 | * dccp_loss_free - Evaluates condition for data loss from RFC 4340, 7.7.1 | |
157 | * @s1: start sequence number | |
158 | * @s2: end sequence number | |
159 | * @ndp: NDP count on packet with sequence number @s2 | |
160 | * Returns true if the sequence range s1...s2 has no data loss. | |
161 | */ | |
162 | static inline bool dccp_loss_free(const u64 s1, const u64 s2, const u64 ndp) | |
163 | { | |
164 | s64 delta = dccp_delta_seqno(s1, s2); | |
165 | ||
547b792c | 166 | WARN_ON(delta < 0); |
2013c7e3 GR |
167 | return (u64)delta <= ndp + 1; |
168 | } | |
169 | ||
7c657876 ACM |
170 | enum { |
171 | DCCP_MIB_NUM = 0, | |
172 | DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */ | |
173 | DCCP_MIB_ESTABRESETS, /* EstabResets */ | |
174 | DCCP_MIB_CURRESTAB, /* CurrEstab */ | |
c9eaf173 | 175 | DCCP_MIB_OUTSEGS, /* OutSegs */ |
7c657876 ACM |
176 | DCCP_MIB_OUTRSTS, |
177 | DCCP_MIB_ABORTONTIMEOUT, | |
178 | DCCP_MIB_TIMEOUTS, | |
179 | DCCP_MIB_ABORTFAILED, | |
180 | DCCP_MIB_PASSIVEOPENS, | |
181 | DCCP_MIB_ATTEMPTFAILS, | |
182 | DCCP_MIB_OUTDATAGRAMS, | |
183 | DCCP_MIB_INERRS, | |
184 | DCCP_MIB_OPTMANDATORYERROR, | |
185 | DCCP_MIB_INVALIDOPT, | |
186 | __DCCP_MIB_MAX | |
187 | }; | |
188 | ||
189 | #define DCCP_MIB_MAX __DCCP_MIB_MAX | |
190 | struct dccp_mib { | |
191 | unsigned long mibs[DCCP_MIB_MAX]; | |
ec733b15 | 192 | }; |
7c657876 ACM |
193 | |
194 | DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics); | |
7690af3f ACM |
195 | #define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field) |
196 | #define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field) | |
197 | #define DCCP_INC_STATS_USER(field) SNMP_INC_STATS_USER(dccp_statistics, field) | |
198 | #define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field) | |
199 | #define DCCP_ADD_STATS_BH(field, val) \ | |
200 | SNMP_ADD_STATS_BH(dccp_statistics, field, val) | |
201 | #define DCCP_ADD_STATS_USER(field, val) \ | |
202 | SNMP_ADD_STATS_USER(dccp_statistics, field, val) | |
7c657876 | 203 | |
6f4e5fff GR |
204 | /* |
205 | * Checksumming routines | |
206 | */ | |
e961811f | 207 | static inline unsigned int dccp_csum_coverage(const struct sk_buff *skb) |
6f4e5fff GR |
208 | { |
209 | const struct dccp_hdr* dh = dccp_hdr(skb); | |
210 | ||
211 | if (dh->dccph_cscov == 0) | |
212 | return skb->len; | |
213 | return (dh->dccph_doff + dh->dccph_cscov - 1) * sizeof(u32); | |
214 | } | |
215 | ||
216 | static inline void dccp_csum_outgoing(struct sk_buff *skb) | |
217 | { | |
e961811f | 218 | unsigned int cov = dccp_csum_coverage(skb); |
6f4e5fff GR |
219 | |
220 | if (cov >= skb->len) | |
221 | dccp_hdr(skb)->dccph_cscov = 0; | |
222 | ||
223 | skb->csum = skb_checksum(skb, 0, (cov > skb->len)? skb->len : cov, 0); | |
224 | } | |
225 | ||
bb296246 | 226 | extern void dccp_v4_send_check(struct sock *sk, struct sk_buff *skb); |
6f4e5fff | 227 | |
59435444 | 228 | extern int dccp_retransmit_skb(struct sock *sk); |
7c657876 | 229 | |
7c657876 | 230 | extern void dccp_send_ack(struct sock *sk); |
6edafaaf GJ |
231 | extern void dccp_reqsk_send_ack(struct sock *sk, struct sk_buff *skb, |
232 | struct request_sock *rsk); | |
8a73cd09 | 233 | |
e92ae93a ACM |
234 | extern void dccp_send_sync(struct sock *sk, const u64 seq, |
235 | const enum dccp_pkt_type pkt_type); | |
7c657876 | 236 | |
97e5848d | 237 | extern void dccp_write_xmit(struct sock *sk, int block); |
c530cfb1 | 238 | extern void dccp_write_space(struct sock *sk); |
27258ee5 | 239 | |
7c657876 ACM |
240 | extern void dccp_init_xmit_timers(struct sock *sk); |
241 | static inline void dccp_clear_xmit_timers(struct sock *sk) | |
242 | { | |
243 | inet_csk_clear_xmit_timers(sk); | |
244 | } | |
245 | ||
246 | extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu); | |
247 | ||
248 | extern const char *dccp_packet_name(const int type); | |
7c657876 | 249 | |
c25a18ba ACM |
250 | extern void dccp_set_state(struct sock *sk, const int state); |
251 | extern void dccp_done(struct sock *sk); | |
7c657876 | 252 | |
ac75773c GR |
253 | extern int dccp_reqsk_init(struct request_sock *rq, struct dccp_sock const *dp, |
254 | struct sk_buff const *skb); | |
7c657876 | 255 | |
7c657876 ACM |
256 | extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb); |
257 | ||
258 | extern struct sock *dccp_create_openreq_child(struct sock *sk, | |
259 | const struct request_sock *req, | |
260 | const struct sk_buff *skb); | |
261 | ||
262 | extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb); | |
263 | ||
7c657876 ACM |
264 | extern struct sock *dccp_v4_request_recv_sock(struct sock *sk, |
265 | struct sk_buff *skb, | |
266 | struct request_sock *req, | |
267 | struct dst_entry *dst); | |
268 | extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb, | |
269 | struct request_sock *req, | |
270 | struct request_sock **prev); | |
271 | ||
272 | extern int dccp_child_process(struct sock *parent, struct sock *child, | |
273 | struct sk_buff *skb); | |
274 | extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb, | |
275 | struct dccp_hdr *dh, unsigned len); | |
276 | extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb, | |
277 | const struct dccp_hdr *dh, const unsigned len); | |
278 | ||
72478873 | 279 | extern int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized); |
7d06b2e0 | 280 | extern void dccp_destroy_sock(struct sock *sk); |
f21e68ca | 281 | |
7c657876 ACM |
282 | extern void dccp_close(struct sock *sk, long timeout); |
283 | extern struct sk_buff *dccp_make_response(struct sock *sk, | |
284 | struct dst_entry *dst, | |
285 | struct request_sock *req); | |
286 | ||
287 | extern int dccp_connect(struct sock *sk); | |
288 | extern int dccp_disconnect(struct sock *sk, int flags); | |
289 | extern int dccp_getsockopt(struct sock *sk, int level, int optname, | |
a1d3a355 ACM |
290 | char __user *optval, int __user *optlen); |
291 | extern int dccp_setsockopt(struct sock *sk, int level, int optname, | |
b7058842 | 292 | char __user *optval, unsigned int optlen); |
3fdadf7d DM |
293 | #ifdef CONFIG_COMPAT |
294 | extern int compat_dccp_getsockopt(struct sock *sk, | |
295 | int level, int optname, | |
296 | char __user *optval, int __user *optlen); | |
297 | extern int compat_dccp_setsockopt(struct sock *sk, | |
298 | int level, int optname, | |
b7058842 | 299 | char __user *optval, unsigned int optlen); |
3fdadf7d | 300 | #endif |
7c657876 | 301 | extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg); |
7690af3f ACM |
302 | extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, |
303 | struct msghdr *msg, size_t size); | |
7c657876 ACM |
304 | extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, |
305 | struct msghdr *msg, size_t len, int nonblock, | |
306 | int flags, int *addr_len); | |
7c657876 | 307 | extern void dccp_shutdown(struct sock *sk, int how); |
f21e68ca ACM |
308 | extern int inet_dccp_listen(struct socket *sock, int backlog); |
309 | extern unsigned int dccp_poll(struct file *file, struct socket *sock, | |
310 | poll_table *wait); | |
f21e68ca ACM |
311 | extern int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, |
312 | int addr_len); | |
7c657876 | 313 | |
7630f026 | 314 | extern struct sk_buff *dccp_ctl_make_reset(struct sock *sk, |
e356d37a | 315 | struct sk_buff *skb); |
017487d7 | 316 | extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code); |
7ad07e7c | 317 | extern void dccp_send_close(struct sock *sk, const int active); |
f21e68ca | 318 | extern int dccp_invalid_packet(struct sk_buff *skb); |
3393da82 | 319 | extern u32 dccp_sample_rtt(struct sock *sk, long delta); |
f21e68ca ACM |
320 | |
321 | static inline int dccp_bad_service_code(const struct sock *sk, | |
60fe62e7 | 322 | const __be32 service) |
f21e68ca ACM |
323 | { |
324 | const struct dccp_sock *dp = dccp_sk(sk); | |
325 | ||
326 | if (dp->dccps_service == service) | |
327 | return 0; | |
328 | return !dccp_list_has_service(dp->dccps_service_list, service); | |
329 | } | |
7c657876 | 330 | |
0430ee34 GR |
331 | /** |
332 | * dccp_skb_cb - DCCP per-packet control information | |
333 | * @dccpd_type: one of %dccp_pkt_type (or unknown) | |
334 | * @dccpd_ccval: CCVal field (5.1), see e.g. RFC 4342, 8.1 | |
335 | * @dccpd_reset_code: one of %dccp_reset_codes | |
336 | * @dccpd_reset_data: Data1..3 fields (depend on @dccpd_reset_code) | |
337 | * @dccpd_opt_len: total length of all options (5.8) in the packet | |
338 | * @dccpd_seq: sequence number | |
339 | * @dccpd_ack_seq: acknowledgment number subheader field value | |
340 | * This is used for transmission as well as for reception. | |
341 | */ | |
7c657876 | 342 | struct dccp_skb_cb { |
028b0275 PM |
343 | union { |
344 | struct inet_skb_parm h4; | |
345 | #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) | |
346 | struct inet6_skb_parm h6; | |
347 | #endif | |
348 | } header; | |
67e6b629 ACM |
349 | __u8 dccpd_type:4; |
350 | __u8 dccpd_ccval:4; | |
0430ee34 GR |
351 | __u8 dccpd_reset_code, |
352 | dccpd_reset_data[3]; | |
67e6b629 | 353 | __u16 dccpd_opt_len; |
7c657876 ACM |
354 | __u64 dccpd_seq; |
355 | __u64 dccpd_ack_seq; | |
7c657876 ACM |
356 | }; |
357 | ||
358 | #define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0])) | |
359 | ||
2180c41c | 360 | /* RFC 4340, sec. 7.7 */ |
7c657876 ACM |
361 | static inline int dccp_non_data_packet(const struct sk_buff *skb) |
362 | { | |
363 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; | |
364 | ||
365 | return type == DCCP_PKT_ACK || | |
366 | type == DCCP_PKT_CLOSE || | |
367 | type == DCCP_PKT_CLOSEREQ || | |
368 | type == DCCP_PKT_RESET || | |
369 | type == DCCP_PKT_SYNC || | |
370 | type == DCCP_PKT_SYNCACK; | |
371 | } | |
372 | ||
2180c41c GR |
373 | /* RFC 4340, sec. 7.7 */ |
374 | static inline int dccp_data_packet(const struct sk_buff *skb) | |
375 | { | |
376 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; | |
377 | ||
378 | return type == DCCP_PKT_DATA || | |
379 | type == DCCP_PKT_DATAACK || | |
380 | type == DCCP_PKT_REQUEST || | |
381 | type == DCCP_PKT_RESPONSE; | |
382 | } | |
383 | ||
7c657876 ACM |
384 | static inline int dccp_packet_without_ack(const struct sk_buff *skb) |
385 | { | |
386 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; | |
387 | ||
388 | return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST; | |
389 | } | |
390 | ||
6b811d43 | 391 | #define DCCP_PKT_WITHOUT_ACK_SEQ (UINT48_MAX << 2) |
7c657876 ACM |
392 | |
393 | static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss) | |
394 | { | |
7690af3f ACM |
395 | struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh + |
396 | sizeof(*dh)); | |
60fe62e7 AB |
397 | dh->dccph_seq2 = 0; |
398 | dh->dccph_seq = htons((gss >> 32) & 0xfffff); | |
7c657876 ACM |
399 | dhx->dccph_seq_low = htonl(gss & 0xffffffff); |
400 | } | |
401 | ||
7690af3f ACM |
402 | static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack, |
403 | const u64 gsr) | |
7c657876 | 404 | { |
60fe62e7 AB |
405 | dhack->dccph_reserved1 = 0; |
406 | dhack->dccph_ack_nr_high = htons(gsr >> 32); | |
7c657876 ACM |
407 | dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff); |
408 | } | |
409 | ||
410 | static inline void dccp_update_gsr(struct sock *sk, u64 seq) | |
411 | { | |
412 | struct dccp_sock *dp = dccp_sk(sk); | |
7c657876 | 413 | |
03ace394 | 414 | dp->dccps_gsr = seq; |
792b4878 GR |
415 | /* Sequence validity window depends on remote Sequence Window (7.5.1) */ |
416 | dp->dccps_swl = SUB48(ADD48(dp->dccps_gsr, 1), dp->dccps_r_seq_win / 4); | |
0b53d460 GR |
417 | /* |
418 | * Adjust SWL so that it is not below ISR. In contrast to RFC 4340, | |
419 | * 7.5.1 we perform this check beyond the initial handshake: W/W' are | |
420 | * always > 32, so for the first W/W' packets in the lifetime of a | |
421 | * connection we always have to adjust SWL. | |
422 | * A second reason why we are doing this is that the window depends on | |
423 | * the feature-remote value of Sequence Window: nothing stops the peer | |
424 | * from updating this value while we are busy adjusting SWL for the | |
425 | * first W packets (we would have to count from scratch again then). | |
426 | * Therefore it is safer to always make sure that the Sequence Window | |
427 | * is not artificially extended by a peer who grows SWL downwards by | |
428 | * continually updating the feature-remote Sequence-Window. | |
429 | * If sequence numbers wrap it is bad luck. But that will take a while | |
430 | * (48 bit), and this measure prevents Sequence-number attacks. | |
431 | */ | |
432 | if (before48(dp->dccps_swl, dp->dccps_isr)) | |
433 | dp->dccps_swl = dp->dccps_isr; | |
792b4878 | 434 | dp->dccps_swh = ADD48(dp->dccps_gsr, (3 * dp->dccps_r_seq_win) / 4); |
7c657876 ACM |
435 | } |
436 | ||
437 | static inline void dccp_update_gss(struct sock *sk, u64 seq) | |
438 | { | |
439 | struct dccp_sock *dp = dccp_sk(sk); | |
7c657876 | 440 | |
792b4878 GR |
441 | dp->dccps_gss = seq; |
442 | /* Ack validity window depends on local Sequence Window value (7.5.1) */ | |
443 | dp->dccps_awl = SUB48(ADD48(dp->dccps_gss, 1), dp->dccps_l_seq_win); | |
0b53d460 GR |
444 | /* Adjust AWL so that it is not below ISS - see comment above for SWL */ |
445 | if (before48(dp->dccps_awl, dp->dccps_iss)) | |
446 | dp->dccps_awl = dp->dccps_iss; | |
792b4878 | 447 | dp->dccps_awh = dp->dccps_gss; |
7c657876 | 448 | } |
c9eaf173 | 449 | |
ae31c339 ACM |
450 | static inline int dccp_ack_pending(const struct sock *sk) |
451 | { | |
452 | const struct dccp_sock *dp = dccp_sk(sk); | |
453 | return dp->dccps_timestamp_echo != 0 || | |
6fdd34d4 | 454 | (dp->dccps_hc_rx_ackvec != NULL && |
ae31c339 | 455 | dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) || |
ae31c339 ACM |
456 | inet_csk_ack_scheduled(sk); |
457 | } | |
7c657876 | 458 | |
9eca0a47 | 459 | extern int dccp_feat_finalise_settings(struct dccp_sock *dp); |
0c116839 | 460 | extern int dccp_feat_server_ccid_dependencies(struct dccp_request_sock *dreq); |
0971d17c GR |
461 | extern int dccp_feat_insert_opts(struct dccp_sock*, struct dccp_request_sock*, |
462 | struct sk_buff *skb); | |
422d9cdc | 463 | extern int dccp_feat_activate_values(struct sock *sk, struct list_head *fn); |
61e6473e GR |
464 | extern void dccp_feat_list_purge(struct list_head *fn_list); |
465 | ||
2d0817d1 | 466 | extern int dccp_insert_options(struct sock *sk, struct sk_buff *skb); |
af3b867e | 467 | extern int dccp_insert_options_rsk(struct dccp_request_sock*, struct sk_buff*); |
a7d13fbf | 468 | extern int dccp_insert_option_elapsed_time(struct sk_buff *skb, u32 elapsed); |
4c70f383 GR |
469 | extern u32 dccp_timestamp(void); |
470 | extern void dccp_timestamping_init(void); | |
a7d13fbf GR |
471 | extern int dccp_insert_option(struct sk_buff *skb, unsigned char option, |
472 | const void *value, unsigned char len); | |
7c657876 | 473 | |
e55d912f ACM |
474 | #ifdef CONFIG_SYSCTL |
475 | extern int dccp_sysctl_init(void); | |
476 | extern void dccp_sysctl_exit(void); | |
477 | #else | |
478 | static inline int dccp_sysctl_init(void) | |
479 | { | |
480 | return 0; | |
481 | } | |
482 | ||
483 | static inline void dccp_sysctl_exit(void) | |
484 | { | |
485 | } | |
486 | #endif | |
487 | ||
7c657876 | 488 | #endif /* _DCCP_H */ |