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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 IM |
7 | * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br> |
8 | * Copyright (c) 2005 Ian McDonald <iam4@cs.waikato.ac.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; | |
38 | extern int dccp_tw_count; | |
39 | extern void dccp_tw_deschedule(struct inet_timewait_sock *tw); | |
40 | ||
41 | extern void dccp_time_wait(struct sock *sk, int state, int timeo); | |
42 | ||
43 | /* FIXME: Right size this */ | |
44 | #define DCCP_MAX_OPT_LEN 128 | |
45 | ||
46 | #define DCCP_MAX_PACKET_HDR 32 | |
47 | ||
48 | #define MAX_DCCP_HEADER (DCCP_MAX_PACKET_HDR + DCCP_MAX_OPT_LEN + MAX_HEADER) | |
49 | ||
50 | #define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT | |
51 | * state, about 60 seconds */ | |
52 | ||
53 | /* draft-ietf-dccp-spec-11.txt initial RTO value */ | |
54 | #define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ)) | |
55 | ||
56 | /* Maximal interval between probes for local resources. */ | |
57 | #define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U)) | |
58 | ||
59 | #define DCCP_RTO_MAX ((unsigned)(120 * HZ)) /* FIXME: using TCP value */ | |
60 | ||
7c657876 | 61 | /* is seq1 < seq2 ? */ |
a10cedd4 | 62 | static inline int before48(const u64 seq1, const u64 seq2) |
7c657876 | 63 | { |
a10cedd4 | 64 | return (s64)((seq1 << 16) - (seq2 << 16)) < 0; |
7c657876 ACM |
65 | } |
66 | ||
67 | /* is seq1 > seq2 ? */ | |
a10cedd4 | 68 | static inline int after48(const u64 seq1, const u64 seq2) |
7c657876 | 69 | { |
a10cedd4 | 70 | return (s64)((seq2 << 16) - (seq1 << 16)) < 0; |
7c657876 ACM |
71 | } |
72 | ||
73 | /* is seq2 <= seq1 <= seq3 ? */ | |
a10cedd4 | 74 | static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3) |
7c657876 ACM |
75 | { |
76 | return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16); | |
77 | } | |
78 | ||
79 | static inline u64 max48(const u64 seq1, const u64 seq2) | |
80 | { | |
81 | return after48(seq1, seq2) ? seq1 : seq2; | |
82 | } | |
83 | ||
84 | enum { | |
85 | DCCP_MIB_NUM = 0, | |
86 | DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */ | |
87 | DCCP_MIB_ESTABRESETS, /* EstabResets */ | |
88 | DCCP_MIB_CURRESTAB, /* CurrEstab */ | |
89 | DCCP_MIB_OUTSEGS, /* OutSegs */ | |
90 | DCCP_MIB_OUTRSTS, | |
91 | DCCP_MIB_ABORTONTIMEOUT, | |
92 | DCCP_MIB_TIMEOUTS, | |
93 | DCCP_MIB_ABORTFAILED, | |
94 | DCCP_MIB_PASSIVEOPENS, | |
95 | DCCP_MIB_ATTEMPTFAILS, | |
96 | DCCP_MIB_OUTDATAGRAMS, | |
97 | DCCP_MIB_INERRS, | |
98 | DCCP_MIB_OPTMANDATORYERROR, | |
99 | DCCP_MIB_INVALIDOPT, | |
100 | __DCCP_MIB_MAX | |
101 | }; | |
102 | ||
103 | #define DCCP_MIB_MAX __DCCP_MIB_MAX | |
104 | struct dccp_mib { | |
105 | unsigned long mibs[DCCP_MIB_MAX]; | |
106 | } __SNMP_MIB_ALIGN__; | |
107 | ||
108 | DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics); | |
7690af3f ACM |
109 | #define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field) |
110 | #define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field) | |
111 | #define DCCP_INC_STATS_USER(field) SNMP_INC_STATS_USER(dccp_statistics, field) | |
112 | #define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field) | |
113 | #define DCCP_ADD_STATS_BH(field, val) \ | |
114 | SNMP_ADD_STATS_BH(dccp_statistics, field, val) | |
115 | #define DCCP_ADD_STATS_USER(field, val) \ | |
116 | SNMP_ADD_STATS_USER(dccp_statistics, field, val) | |
7c657876 | 117 | |
7c657876 ACM |
118 | extern int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb); |
119 | ||
7c657876 ACM |
120 | extern void dccp_send_ack(struct sock *sk); |
121 | extern void dccp_send_delayed_ack(struct sock *sk); | |
e92ae93a ACM |
122 | extern void dccp_send_sync(struct sock *sk, const u64 seq, |
123 | const enum dccp_pkt_type pkt_type); | |
7c657876 | 124 | |
d6809c12 | 125 | extern int dccp_write_xmit(struct sock *sk, struct sk_buff *skb, long *timeo); |
c530cfb1 | 126 | extern void dccp_write_space(struct sock *sk); |
27258ee5 | 127 | |
7c657876 ACM |
128 | extern void dccp_init_xmit_timers(struct sock *sk); |
129 | static inline void dccp_clear_xmit_timers(struct sock *sk) | |
130 | { | |
131 | inet_csk_clear_xmit_timers(sk); | |
132 | } | |
133 | ||
134 | extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu); | |
135 | ||
136 | extern const char *dccp_packet_name(const int type); | |
137 | extern const char *dccp_state_name(const int state); | |
138 | ||
c25a18ba ACM |
139 | extern void dccp_set_state(struct sock *sk, const int state); |
140 | extern void dccp_done(struct sock *sk); | |
7c657876 ACM |
141 | |
142 | static inline void dccp_openreq_init(struct request_sock *req, | |
143 | struct dccp_sock *dp, | |
144 | struct sk_buff *skb) | |
145 | { | |
146 | /* | |
147 | * FIXME: fill in the other req fields from the DCCP options | |
148 | * received | |
149 | */ | |
150 | inet_rsk(req)->rmt_port = dccp_hdr(skb)->dccph_sport; | |
151 | inet_rsk(req)->acked = 0; | |
152 | req->rcv_wnd = 0; | |
153 | } | |
154 | ||
7c657876 ACM |
155 | extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb); |
156 | ||
157 | extern struct sock *dccp_create_openreq_child(struct sock *sk, | |
158 | const struct request_sock *req, | |
159 | const struct sk_buff *skb); | |
160 | ||
161 | extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb); | |
162 | ||
7c657876 ACM |
163 | extern struct sock *dccp_v4_request_recv_sock(struct sock *sk, |
164 | struct sk_buff *skb, | |
165 | struct request_sock *req, | |
166 | struct dst_entry *dst); | |
167 | extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb, | |
168 | struct request_sock *req, | |
169 | struct request_sock **prev); | |
170 | ||
171 | extern int dccp_child_process(struct sock *parent, struct sock *child, | |
172 | struct sk_buff *skb); | |
173 | extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb, | |
174 | struct dccp_hdr *dh, unsigned len); | |
175 | extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb, | |
176 | const struct dccp_hdr *dh, const unsigned len); | |
177 | ||
72478873 | 178 | extern int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized); |
3e0fadc5 | 179 | extern int dccp_destroy_sock(struct sock *sk); |
f21e68ca | 180 | |
7c657876 ACM |
181 | extern void dccp_close(struct sock *sk, long timeout); |
182 | extern struct sk_buff *dccp_make_response(struct sock *sk, | |
183 | struct dst_entry *dst, | |
184 | struct request_sock *req); | |
185 | ||
186 | extern int dccp_connect(struct sock *sk); | |
187 | extern int dccp_disconnect(struct sock *sk, int flags); | |
c985ed70 | 188 | extern void dccp_hash(struct sock *sk); |
f21e68ca | 189 | extern void dccp_unhash(struct sock *sk); |
7c657876 | 190 | extern int dccp_getsockopt(struct sock *sk, int level, int optname, |
a1d3a355 ACM |
191 | char __user *optval, int __user *optlen); |
192 | extern int dccp_setsockopt(struct sock *sk, int level, int optname, | |
193 | char __user *optval, int optlen); | |
3fdadf7d DM |
194 | #ifdef CONFIG_COMPAT |
195 | extern int compat_dccp_getsockopt(struct sock *sk, | |
196 | int level, int optname, | |
197 | char __user *optval, int __user *optlen); | |
198 | extern int compat_dccp_setsockopt(struct sock *sk, | |
199 | int level, int optname, | |
200 | char __user *optval, int optlen); | |
201 | #endif | |
7c657876 | 202 | extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg); |
7690af3f ACM |
203 | extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, |
204 | struct msghdr *msg, size_t size); | |
7c657876 ACM |
205 | extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, |
206 | struct msghdr *msg, size_t len, int nonblock, | |
207 | int flags, int *addr_len); | |
7c657876 | 208 | extern void dccp_shutdown(struct sock *sk, int how); |
f21e68ca ACM |
209 | extern int inet_dccp_listen(struct socket *sock, int backlog); |
210 | extern unsigned int dccp_poll(struct file *file, struct socket *sock, | |
211 | poll_table *wait); | |
212 | extern void dccp_v4_send_check(struct sock *sk, int len, | |
213 | struct sk_buff *skb); | |
214 | extern int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, | |
215 | int addr_len); | |
7c657876 | 216 | |
95b81ef7 | 217 | extern int dccp_v4_checksum(const struct sk_buff *skb, |
60fe62e7 | 218 | const __be32 saddr, const __be32 daddr); |
7c657876 | 219 | |
017487d7 | 220 | extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code); |
7ad07e7c | 221 | extern void dccp_send_close(struct sock *sk, const int active); |
f21e68ca ACM |
222 | extern int dccp_invalid_packet(struct sk_buff *skb); |
223 | ||
224 | static inline int dccp_bad_service_code(const struct sock *sk, | |
60fe62e7 | 225 | const __be32 service) |
f21e68ca ACM |
226 | { |
227 | const struct dccp_sock *dp = dccp_sk(sk); | |
228 | ||
229 | if (dp->dccps_service == service) | |
230 | return 0; | |
231 | return !dccp_list_has_service(dp->dccps_service_list, service); | |
232 | } | |
7c657876 ACM |
233 | |
234 | struct dccp_skb_cb { | |
67e6b629 ACM |
235 | __u8 dccpd_type:4; |
236 | __u8 dccpd_ccval:4; | |
237 | __u8 dccpd_reset_code; | |
238 | __u16 dccpd_opt_len; | |
7c657876 ACM |
239 | __u64 dccpd_seq; |
240 | __u64 dccpd_ack_seq; | |
7c657876 ACM |
241 | }; |
242 | ||
243 | #define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0])) | |
244 | ||
245 | static inline int dccp_non_data_packet(const struct sk_buff *skb) | |
246 | { | |
247 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; | |
248 | ||
249 | return type == DCCP_PKT_ACK || | |
250 | type == DCCP_PKT_CLOSE || | |
251 | type == DCCP_PKT_CLOSEREQ || | |
252 | type == DCCP_PKT_RESET || | |
253 | type == DCCP_PKT_SYNC || | |
254 | type == DCCP_PKT_SYNCACK; | |
255 | } | |
256 | ||
257 | static inline int dccp_packet_without_ack(const struct sk_buff *skb) | |
258 | { | |
259 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; | |
260 | ||
261 | return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST; | |
262 | } | |
263 | ||
264 | #define DCCP_MAX_SEQNO ((((u64)1) << 48) - 1) | |
265 | #define DCCP_PKT_WITHOUT_ACK_SEQ (DCCP_MAX_SEQNO << 2) | |
266 | ||
267 | static inline void dccp_set_seqno(u64 *seqno, u64 value) | |
268 | { | |
269 | if (value > DCCP_MAX_SEQNO) | |
270 | value -= DCCP_MAX_SEQNO + 1; | |
271 | *seqno = value; | |
272 | } | |
273 | ||
274 | static inline u64 dccp_delta_seqno(u64 seqno1, u64 seqno2) | |
275 | { | |
276 | return ((seqno2 << 16) - (seqno1 << 16)) >> 16; | |
277 | } | |
278 | ||
279 | static inline void dccp_inc_seqno(u64 *seqno) | |
280 | { | |
281 | if (++*seqno > DCCP_MAX_SEQNO) | |
282 | *seqno = 0; | |
283 | } | |
284 | ||
285 | static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss) | |
286 | { | |
7690af3f ACM |
287 | struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh + |
288 | sizeof(*dh)); | |
60fe62e7 AB |
289 | dh->dccph_seq2 = 0; |
290 | dh->dccph_seq = htons((gss >> 32) & 0xfffff); | |
7c657876 ACM |
291 | dhx->dccph_seq_low = htonl(gss & 0xffffffff); |
292 | } | |
293 | ||
7690af3f ACM |
294 | static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack, |
295 | const u64 gsr) | |
7c657876 | 296 | { |
60fe62e7 AB |
297 | dhack->dccph_reserved1 = 0; |
298 | dhack->dccph_ack_nr_high = htons(gsr >> 32); | |
7c657876 ACM |
299 | dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff); |
300 | } | |
301 | ||
302 | static inline void dccp_update_gsr(struct sock *sk, u64 seq) | |
303 | { | |
304 | struct dccp_sock *dp = dccp_sk(sk); | |
a4bf3902 | 305 | const struct dccp_minisock *dmsk = dccp_msk(sk); |
7c657876 | 306 | |
03ace394 ACM |
307 | dp->dccps_gsr = seq; |
308 | dccp_set_seqno(&dp->dccps_swl, | |
a4bf3902 | 309 | dp->dccps_gsr + 1 - (dmsk->dccpms_sequence_window / 4)); |
7c657876 | 310 | dccp_set_seqno(&dp->dccps_swh, |
a4bf3902 | 311 | dp->dccps_gsr + (3 * dmsk->dccpms_sequence_window) / 4); |
7c657876 ACM |
312 | } |
313 | ||
314 | static inline void dccp_update_gss(struct sock *sk, u64 seq) | |
315 | { | |
316 | struct dccp_sock *dp = dccp_sk(sk); | |
7c657876 | 317 | |
03ace394 ACM |
318 | dp->dccps_awh = dp->dccps_gss = seq; |
319 | dccp_set_seqno(&dp->dccps_awl, | |
7690af3f | 320 | (dp->dccps_gss - |
a4bf3902 | 321 | dccp_msk(sk)->dccpms_sequence_window + 1)); |
7c657876 | 322 | } |
ae31c339 ACM |
323 | |
324 | static inline int dccp_ack_pending(const struct sock *sk) | |
325 | { | |
326 | const struct dccp_sock *dp = dccp_sk(sk); | |
327 | return dp->dccps_timestamp_echo != 0 || | |
328 | #ifdef CONFIG_IP_DCCP_ACKVEC | |
a4bf3902 | 329 | (dccp_msk(sk)->dccpms_send_ack_vector && |
ae31c339 ACM |
330 | dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) || |
331 | #endif | |
332 | inet_csk_ack_scheduled(sk); | |
333 | } | |
7c657876 | 334 | |
2d0817d1 ACM |
335 | extern int dccp_insert_options(struct sock *sk, struct sk_buff *skb); |
336 | extern int dccp_insert_option_elapsed_time(struct sock *sk, | |
7c657876 ACM |
337 | struct sk_buff *skb, |
338 | u32 elapsed_time); | |
2d0817d1 | 339 | extern int dccp_insert_option_timestamp(struct sock *sk, |
d4b81ff7 | 340 | struct sk_buff *skb); |
2d0817d1 | 341 | extern int dccp_insert_option(struct sock *sk, struct sk_buff *skb, |
7c657876 ACM |
342 | unsigned char option, |
343 | const void *value, unsigned char len); | |
344 | ||
b0e56780 ACM |
345 | extern void dccp_timestamp(const struct sock *sk, struct timeval *tv); |
346 | ||
b6ee3d4a ACM |
347 | static inline suseconds_t timeval_usecs(const struct timeval *tv) |
348 | { | |
349 | return tv->tv_sec * USEC_PER_SEC + tv->tv_usec; | |
350 | } | |
351 | ||
352 | static inline suseconds_t timeval_delta(const struct timeval *large, | |
353 | const struct timeval *small) | |
354 | { | |
355 | time_t secs = large->tv_sec - small->tv_sec; | |
356 | suseconds_t usecs = large->tv_usec - small->tv_usec; | |
357 | ||
358 | if (usecs < 0) { | |
359 | secs--; | |
360 | usecs += USEC_PER_SEC; | |
361 | } | |
362 | return secs * USEC_PER_SEC + usecs; | |
363 | } | |
364 | ||
365 | static inline void timeval_add_usecs(struct timeval *tv, | |
366 | const suseconds_t usecs) | |
367 | { | |
368 | tv->tv_usec += usecs; | |
369 | while (tv->tv_usec >= USEC_PER_SEC) { | |
370 | tv->tv_sec++; | |
371 | tv->tv_usec -= USEC_PER_SEC; | |
372 | } | |
373 | } | |
374 | ||
375 | static inline void timeval_sub_usecs(struct timeval *tv, | |
376 | const suseconds_t usecs) | |
377 | { | |
378 | tv->tv_usec -= usecs; | |
379 | while (tv->tv_usec < 0) { | |
380 | tv->tv_sec--; | |
381 | tv->tv_usec += USEC_PER_SEC; | |
382 | } | |
383 | } | |
384 | ||
e55d912f ACM |
385 | #ifdef CONFIG_SYSCTL |
386 | extern int dccp_sysctl_init(void); | |
387 | extern void dccp_sysctl_exit(void); | |
388 | #else | |
389 | static inline int dccp_sysctl_init(void) | |
390 | { | |
391 | return 0; | |
392 | } | |
393 | ||
394 | static inline void dccp_sysctl_exit(void) | |
395 | { | |
396 | } | |
397 | #endif | |
398 | ||
7c657876 | 399 | #endif /* _DCCP_H */ |