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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> | |
16 | #include <net/snmp.h> | |
17 | #include <net/sock.h> | |
18 | #include <net/tcp.h> | |
ae31c339 | 19 | #include "ackvec.h" |
7c657876 | 20 | |
725ba8ee | 21 | #ifdef CONFIG_IP_DCCP_DEBUG |
7c657876 ACM |
22 | extern int dccp_debug; |
23 | ||
24 | #define dccp_pr_debug(format, a...) \ | |
25 | do { if (dccp_debug) \ | |
26 | printk(KERN_DEBUG "%s: " format, __FUNCTION__ , ##a); \ | |
27 | } while (0) | |
7690af3f ACM |
28 | #define dccp_pr_debug_cat(format, a...) do { if (dccp_debug) \ |
29 | printk(format, ##a); } while (0) | |
7c657876 ACM |
30 | #else |
31 | #define dccp_pr_debug(format, a...) | |
32 | #define dccp_pr_debug_cat(format, a...) | |
33 | #endif | |
34 | ||
35 | extern struct inet_hashinfo dccp_hashinfo; | |
36 | ||
37 | extern atomic_t dccp_orphan_count; | |
7c657876 ACM |
38 | |
39 | extern void dccp_time_wait(struct sock *sk, int state, int timeo); | |
40 | ||
60361be1 GR |
41 | /* |
42 | * Set safe upper bounds for header and option length. Since Data Offset is 8 | |
43 | * bits (RFC 4340, sec. 5.1), the total header length can never be more than | |
44 | * 4 * 255 = 1020 bytes. The largest possible header length is 28 bytes (X=1): | |
45 | * - DCCP-Response with ACK Subheader and 4 bytes of Service code OR | |
46 | * - DCCP-Reset with ACK Subheader and 4 bytes of Reset Code fields | |
47 | * Hence a safe upper bound for the maximum option length is 1020-28 = 992 | |
48 | */ | |
49 | #define MAX_DCCP_SPECIFIC_HEADER (255 * sizeof(int)) | |
50 | #define DCCP_MAX_PACKET_HDR 28 | |
51 | #define DCCP_MAX_OPT_LEN (MAX_DCCP_SPECIFIC_HEADER - DCCP_MAX_PACKET_HDR) | |
52 | #define MAX_DCCP_HEADER (MAX_DCCP_SPECIFIC_HEADER + MAX_HEADER) | |
7c657876 ACM |
53 | |
54 | #define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT | |
55 | * state, about 60 seconds */ | |
56 | ||
0e64e94e | 57 | /* RFC 1122, 4.2.3.1 initial RTO value */ |
7c657876 ACM |
58 | #define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ)) |
59 | ||
60 | /* Maximal interval between probes for local resources. */ | |
61 | #define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U)) | |
62 | ||
63 | #define DCCP_RTO_MAX ((unsigned)(120 * HZ)) /* FIXME: using TCP value */ | |
64 | ||
f45b3ec4 IM |
65 | #define DCCP_XMIT_TIMEO 30000 /* Time/msecs for blocking transmit per packet */ |
66 | ||
2e2e9e92 GR |
67 | /* sysctl variables for DCCP */ |
68 | extern int sysctl_dccp_request_retries; | |
69 | extern int sysctl_dccp_retries1; | |
70 | extern int sysctl_dccp_retries2; | |
71 | extern int dccp_feat_default_sequence_window; | |
72 | extern int dccp_feat_default_rx_ccid; | |
73 | extern int dccp_feat_default_tx_ccid; | |
74 | extern int dccp_feat_default_ack_ratio; | |
75 | extern int dccp_feat_default_send_ack_vector; | |
76 | extern int dccp_feat_default_send_ndp_count; | |
77 | ||
7c657876 | 78 | /* is seq1 < seq2 ? */ |
a10cedd4 | 79 | static inline int before48(const u64 seq1, const u64 seq2) |
7c657876 | 80 | { |
a10cedd4 | 81 | return (s64)((seq1 << 16) - (seq2 << 16)) < 0; |
7c657876 ACM |
82 | } |
83 | ||
84 | /* is seq1 > seq2 ? */ | |
a10cedd4 | 85 | static inline int after48(const u64 seq1, const u64 seq2) |
7c657876 | 86 | { |
a10cedd4 | 87 | return (s64)((seq2 << 16) - (seq1 << 16)) < 0; |
7c657876 ACM |
88 | } |
89 | ||
90 | /* is seq2 <= seq1 <= seq3 ? */ | |
a10cedd4 | 91 | static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3) |
7c657876 ACM |
92 | { |
93 | return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16); | |
94 | } | |
95 | ||
96 | static inline u64 max48(const u64 seq1, const u64 seq2) | |
97 | { | |
98 | return after48(seq1, seq2) ? seq1 : seq2; | |
99 | } | |
100 | ||
837d107c IM |
101 | /* is seq1 next seqno after seq2 */ |
102 | static inline int follows48(const u64 seq1, const u64 seq2) | |
103 | { | |
104 | int diff = (seq1 & 0xFFFF) - (seq2 & 0xFFFF); | |
105 | ||
106 | return diff==1; | |
107 | } | |
108 | ||
7c657876 ACM |
109 | enum { |
110 | DCCP_MIB_NUM = 0, | |
111 | DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */ | |
112 | DCCP_MIB_ESTABRESETS, /* EstabResets */ | |
113 | DCCP_MIB_CURRESTAB, /* CurrEstab */ | |
114 | DCCP_MIB_OUTSEGS, /* OutSegs */ | |
115 | DCCP_MIB_OUTRSTS, | |
116 | DCCP_MIB_ABORTONTIMEOUT, | |
117 | DCCP_MIB_TIMEOUTS, | |
118 | DCCP_MIB_ABORTFAILED, | |
119 | DCCP_MIB_PASSIVEOPENS, | |
120 | DCCP_MIB_ATTEMPTFAILS, | |
121 | DCCP_MIB_OUTDATAGRAMS, | |
122 | DCCP_MIB_INERRS, | |
123 | DCCP_MIB_OPTMANDATORYERROR, | |
124 | DCCP_MIB_INVALIDOPT, | |
125 | __DCCP_MIB_MAX | |
126 | }; | |
127 | ||
128 | #define DCCP_MIB_MAX __DCCP_MIB_MAX | |
129 | struct dccp_mib { | |
130 | unsigned long mibs[DCCP_MIB_MAX]; | |
131 | } __SNMP_MIB_ALIGN__; | |
132 | ||
133 | DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics); | |
7690af3f ACM |
134 | #define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field) |
135 | #define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field) | |
136 | #define DCCP_INC_STATS_USER(field) SNMP_INC_STATS_USER(dccp_statistics, field) | |
137 | #define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field) | |
138 | #define DCCP_ADD_STATS_BH(field, val) \ | |
139 | SNMP_ADD_STATS_BH(dccp_statistics, field, val) | |
140 | #define DCCP_ADD_STATS_USER(field, val) \ | |
141 | SNMP_ADD_STATS_USER(dccp_statistics, field, val) | |
7c657876 | 142 | |
6f4e5fff GR |
143 | /* |
144 | * Checksumming routines | |
145 | */ | |
146 | static inline int dccp_csum_coverage(const struct sk_buff *skb) | |
147 | { | |
148 | const struct dccp_hdr* dh = dccp_hdr(skb); | |
149 | ||
150 | if (dh->dccph_cscov == 0) | |
151 | return skb->len; | |
152 | return (dh->dccph_doff + dh->dccph_cscov - 1) * sizeof(u32); | |
153 | } | |
154 | ||
155 | static inline void dccp_csum_outgoing(struct sk_buff *skb) | |
156 | { | |
157 | int cov = dccp_csum_coverage(skb); | |
158 | ||
159 | if (cov >= skb->len) | |
160 | dccp_hdr(skb)->dccph_cscov = 0; | |
161 | ||
162 | skb->csum = skb_checksum(skb, 0, (cov > skb->len)? skb->len : cov, 0); | |
163 | } | |
164 | ||
165 | extern void dccp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb); | |
166 | ||
7c657876 ACM |
167 | extern int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb); |
168 | ||
7c657876 ACM |
169 | extern void dccp_send_ack(struct sock *sk); |
170 | extern void dccp_send_delayed_ack(struct sock *sk); | |
8a73cd09 GR |
171 | extern void dccp_reqsk_send_ack(struct sk_buff *sk, struct request_sock *rsk); |
172 | ||
e92ae93a ACM |
173 | extern void dccp_send_sync(struct sock *sk, const u64 seq, |
174 | const enum dccp_pkt_type pkt_type); | |
7c657876 | 175 | |
97e5848d | 176 | extern void dccp_write_xmit(struct sock *sk, int block); |
c530cfb1 | 177 | extern void dccp_write_space(struct sock *sk); |
27258ee5 | 178 | |
7c657876 ACM |
179 | extern void dccp_init_xmit_timers(struct sock *sk); |
180 | static inline void dccp_clear_xmit_timers(struct sock *sk) | |
181 | { | |
182 | inet_csk_clear_xmit_timers(sk); | |
183 | } | |
184 | ||
185 | extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu); | |
186 | ||
187 | extern const char *dccp_packet_name(const int type); | |
188 | extern const char *dccp_state_name(const int state); | |
189 | ||
c25a18ba ACM |
190 | extern void dccp_set_state(struct sock *sk, const int state); |
191 | extern void dccp_done(struct sock *sk); | |
7c657876 | 192 | |
cf557926 | 193 | extern void dccp_reqsk_init(struct request_sock *req, struct sk_buff *skb); |
7c657876 | 194 | |
7c657876 ACM |
195 | extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb); |
196 | ||
197 | extern struct sock *dccp_create_openreq_child(struct sock *sk, | |
198 | const struct request_sock *req, | |
199 | const struct sk_buff *skb); | |
200 | ||
201 | extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb); | |
202 | ||
7c657876 ACM |
203 | extern struct sock *dccp_v4_request_recv_sock(struct sock *sk, |
204 | struct sk_buff *skb, | |
205 | struct request_sock *req, | |
206 | struct dst_entry *dst); | |
207 | extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb, | |
208 | struct request_sock *req, | |
209 | struct request_sock **prev); | |
210 | ||
211 | extern int dccp_child_process(struct sock *parent, struct sock *child, | |
212 | struct sk_buff *skb); | |
213 | extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb, | |
214 | struct dccp_hdr *dh, unsigned len); | |
215 | extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb, | |
216 | const struct dccp_hdr *dh, const unsigned len); | |
217 | ||
72478873 | 218 | extern int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized); |
3e0fadc5 | 219 | extern int dccp_destroy_sock(struct sock *sk); |
f21e68ca | 220 | |
7c657876 ACM |
221 | extern void dccp_close(struct sock *sk, long timeout); |
222 | extern struct sk_buff *dccp_make_response(struct sock *sk, | |
223 | struct dst_entry *dst, | |
224 | struct request_sock *req); | |
225 | ||
226 | extern int dccp_connect(struct sock *sk); | |
227 | extern int dccp_disconnect(struct sock *sk, int flags); | |
c985ed70 | 228 | extern void dccp_hash(struct sock *sk); |
f21e68ca | 229 | extern void dccp_unhash(struct sock *sk); |
7c657876 | 230 | extern int dccp_getsockopt(struct sock *sk, int level, int optname, |
a1d3a355 ACM |
231 | char __user *optval, int __user *optlen); |
232 | extern int dccp_setsockopt(struct sock *sk, int level, int optname, | |
233 | char __user *optval, int optlen); | |
3fdadf7d DM |
234 | #ifdef CONFIG_COMPAT |
235 | extern int compat_dccp_getsockopt(struct sock *sk, | |
236 | int level, int optname, | |
237 | char __user *optval, int __user *optlen); | |
238 | extern int compat_dccp_setsockopt(struct sock *sk, | |
239 | int level, int optname, | |
240 | char __user *optval, int optlen); | |
241 | #endif | |
7c657876 | 242 | extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg); |
7690af3f ACM |
243 | extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, |
244 | struct msghdr *msg, size_t size); | |
7c657876 ACM |
245 | extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, |
246 | struct msghdr *msg, size_t len, int nonblock, | |
247 | int flags, int *addr_len); | |
7c657876 | 248 | extern void dccp_shutdown(struct sock *sk, int how); |
f21e68ca ACM |
249 | extern int inet_dccp_listen(struct socket *sock, int backlog); |
250 | extern unsigned int dccp_poll(struct file *file, struct socket *sock, | |
251 | poll_table *wait); | |
f21e68ca ACM |
252 | extern int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, |
253 | int addr_len); | |
7c657876 | 254 | |
017487d7 | 255 | extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code); |
7ad07e7c | 256 | extern void dccp_send_close(struct sock *sk, const int active); |
f21e68ca ACM |
257 | extern int dccp_invalid_packet(struct sk_buff *skb); |
258 | ||
259 | static inline int dccp_bad_service_code(const struct sock *sk, | |
60fe62e7 | 260 | const __be32 service) |
f21e68ca ACM |
261 | { |
262 | const struct dccp_sock *dp = dccp_sk(sk); | |
263 | ||
264 | if (dp->dccps_service == service) | |
265 | return 0; | |
266 | return !dccp_list_has_service(dp->dccps_service_list, service); | |
267 | } | |
7c657876 ACM |
268 | |
269 | struct dccp_skb_cb { | |
67e6b629 ACM |
270 | __u8 dccpd_type:4; |
271 | __u8 dccpd_ccval:4; | |
272 | __u8 dccpd_reset_code; | |
273 | __u16 dccpd_opt_len; | |
7c657876 ACM |
274 | __u64 dccpd_seq; |
275 | __u64 dccpd_ack_seq; | |
7c657876 ACM |
276 | }; |
277 | ||
278 | #define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0])) | |
279 | ||
280 | static inline int dccp_non_data_packet(const struct sk_buff *skb) | |
281 | { | |
282 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; | |
283 | ||
284 | return type == DCCP_PKT_ACK || | |
285 | type == DCCP_PKT_CLOSE || | |
286 | type == DCCP_PKT_CLOSEREQ || | |
287 | type == DCCP_PKT_RESET || | |
288 | type == DCCP_PKT_SYNC || | |
289 | type == DCCP_PKT_SYNCACK; | |
290 | } | |
291 | ||
292 | static inline int dccp_packet_without_ack(const struct sk_buff *skb) | |
293 | { | |
294 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; | |
295 | ||
296 | return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST; | |
297 | } | |
298 | ||
299 | #define DCCP_MAX_SEQNO ((((u64)1) << 48) - 1) | |
300 | #define DCCP_PKT_WITHOUT_ACK_SEQ (DCCP_MAX_SEQNO << 2) | |
301 | ||
302 | static inline void dccp_set_seqno(u64 *seqno, u64 value) | |
303 | { | |
304 | if (value > DCCP_MAX_SEQNO) | |
305 | value -= DCCP_MAX_SEQNO + 1; | |
306 | *seqno = value; | |
307 | } | |
308 | ||
309 | static inline u64 dccp_delta_seqno(u64 seqno1, u64 seqno2) | |
310 | { | |
311 | return ((seqno2 << 16) - (seqno1 << 16)) >> 16; | |
312 | } | |
313 | ||
314 | static inline void dccp_inc_seqno(u64 *seqno) | |
315 | { | |
316 | if (++*seqno > DCCP_MAX_SEQNO) | |
317 | *seqno = 0; | |
318 | } | |
319 | ||
320 | static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss) | |
321 | { | |
7690af3f ACM |
322 | struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh + |
323 | sizeof(*dh)); | |
60fe62e7 AB |
324 | dh->dccph_seq2 = 0; |
325 | dh->dccph_seq = htons((gss >> 32) & 0xfffff); | |
7c657876 ACM |
326 | dhx->dccph_seq_low = htonl(gss & 0xffffffff); |
327 | } | |
328 | ||
7690af3f ACM |
329 | static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack, |
330 | const u64 gsr) | |
7c657876 | 331 | { |
60fe62e7 AB |
332 | dhack->dccph_reserved1 = 0; |
333 | dhack->dccph_ack_nr_high = htons(gsr >> 32); | |
7c657876 ACM |
334 | dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff); |
335 | } | |
336 | ||
337 | static inline void dccp_update_gsr(struct sock *sk, u64 seq) | |
338 | { | |
339 | struct dccp_sock *dp = dccp_sk(sk); | |
a4bf3902 | 340 | const struct dccp_minisock *dmsk = dccp_msk(sk); |
7c657876 | 341 | |
03ace394 ACM |
342 | dp->dccps_gsr = seq; |
343 | dccp_set_seqno(&dp->dccps_swl, | |
a4bf3902 | 344 | dp->dccps_gsr + 1 - (dmsk->dccpms_sequence_window / 4)); |
7c657876 | 345 | dccp_set_seqno(&dp->dccps_swh, |
a4bf3902 | 346 | dp->dccps_gsr + (3 * dmsk->dccpms_sequence_window) / 4); |
7c657876 ACM |
347 | } |
348 | ||
349 | static inline void dccp_update_gss(struct sock *sk, u64 seq) | |
350 | { | |
351 | struct dccp_sock *dp = dccp_sk(sk); | |
7c657876 | 352 | |
03ace394 ACM |
353 | dp->dccps_awh = dp->dccps_gss = seq; |
354 | dccp_set_seqno(&dp->dccps_awl, | |
7690af3f | 355 | (dp->dccps_gss - |
a4bf3902 | 356 | dccp_msk(sk)->dccpms_sequence_window + 1)); |
7c657876 | 357 | } |
ae31c339 ACM |
358 | |
359 | static inline int dccp_ack_pending(const struct sock *sk) | |
360 | { | |
361 | const struct dccp_sock *dp = dccp_sk(sk); | |
362 | return dp->dccps_timestamp_echo != 0 || | |
363 | #ifdef CONFIG_IP_DCCP_ACKVEC | |
a4bf3902 | 364 | (dccp_msk(sk)->dccpms_send_ack_vector && |
ae31c339 ACM |
365 | dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) || |
366 | #endif | |
367 | inet_csk_ack_scheduled(sk); | |
368 | } | |
7c657876 | 369 | |
2d0817d1 ACM |
370 | extern int dccp_insert_options(struct sock *sk, struct sk_buff *skb); |
371 | extern int dccp_insert_option_elapsed_time(struct sock *sk, | |
7c657876 ACM |
372 | struct sk_buff *skb, |
373 | u32 elapsed_time); | |
2d0817d1 | 374 | extern int dccp_insert_option_timestamp(struct sock *sk, |
d4b81ff7 | 375 | struct sk_buff *skb); |
2d0817d1 | 376 | extern int dccp_insert_option(struct sock *sk, struct sk_buff *skb, |
7c657876 ACM |
377 | unsigned char option, |
378 | const void *value, unsigned char len); | |
379 | ||
b0e56780 ACM |
380 | extern void dccp_timestamp(const struct sock *sk, struct timeval *tv); |
381 | ||
b6ee3d4a ACM |
382 | static inline suseconds_t timeval_usecs(const struct timeval *tv) |
383 | { | |
384 | return tv->tv_sec * USEC_PER_SEC + tv->tv_usec; | |
385 | } | |
386 | ||
387 | static inline suseconds_t timeval_delta(const struct timeval *large, | |
388 | const struct timeval *small) | |
389 | { | |
390 | time_t secs = large->tv_sec - small->tv_sec; | |
391 | suseconds_t usecs = large->tv_usec - small->tv_usec; | |
392 | ||
393 | if (usecs < 0) { | |
394 | secs--; | |
395 | usecs += USEC_PER_SEC; | |
396 | } | |
397 | return secs * USEC_PER_SEC + usecs; | |
398 | } | |
399 | ||
400 | static inline void timeval_add_usecs(struct timeval *tv, | |
401 | const suseconds_t usecs) | |
402 | { | |
403 | tv->tv_usec += usecs; | |
404 | while (tv->tv_usec >= USEC_PER_SEC) { | |
405 | tv->tv_sec++; | |
406 | tv->tv_usec -= USEC_PER_SEC; | |
407 | } | |
408 | } | |
409 | ||
410 | static inline void timeval_sub_usecs(struct timeval *tv, | |
411 | const suseconds_t usecs) | |
412 | { | |
413 | tv->tv_usec -= usecs; | |
414 | while (tv->tv_usec < 0) { | |
415 | tv->tv_sec--; | |
416 | tv->tv_usec += USEC_PER_SEC; | |
417 | } | |
418 | } | |
419 | ||
e55d912f ACM |
420 | #ifdef CONFIG_SYSCTL |
421 | extern int dccp_sysctl_init(void); | |
422 | extern void dccp_sysctl_exit(void); | |
423 | #else | |
424 | static inline int dccp_sysctl_init(void) | |
425 | { | |
426 | return 0; | |
427 | } | |
428 | ||
429 | static inline void dccp_sysctl_exit(void) | |
430 | { | |
431 | } | |
432 | #endif | |
433 | ||
7c657876 | 434 | #endif /* _DCCP_H */ |