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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 | ||
725ba8ee | 15 | #include <linux/config.h> |
7c657876 ACM |
16 | #include <linux/dccp.h> |
17 | #include <net/snmp.h> | |
18 | #include <net/sock.h> | |
19 | #include <net/tcp.h> | |
ae31c339 | 20 | #include "ackvec.h" |
7c657876 | 21 | |
725ba8ee | 22 | #ifdef CONFIG_IP_DCCP_DEBUG |
7c657876 ACM |
23 | extern int dccp_debug; |
24 | ||
25 | #define dccp_pr_debug(format, a...) \ | |
26 | do { if (dccp_debug) \ | |
27 | printk(KERN_DEBUG "%s: " format, __FUNCTION__ , ##a); \ | |
28 | } while (0) | |
7690af3f ACM |
29 | #define dccp_pr_debug_cat(format, a...) do { if (dccp_debug) \ |
30 | printk(format, ##a); } while (0) | |
7c657876 ACM |
31 | #else |
32 | #define dccp_pr_debug(format, a...) | |
33 | #define dccp_pr_debug_cat(format, a...) | |
34 | #endif | |
35 | ||
36 | extern struct inet_hashinfo dccp_hashinfo; | |
37 | ||
38 | extern atomic_t dccp_orphan_count; | |
39 | extern int dccp_tw_count; | |
40 | extern void dccp_tw_deschedule(struct inet_timewait_sock *tw); | |
41 | ||
42 | extern void dccp_time_wait(struct sock *sk, int state, int timeo); | |
43 | ||
44 | /* FIXME: Right size this */ | |
45 | #define DCCP_MAX_OPT_LEN 128 | |
46 | ||
47 | #define DCCP_MAX_PACKET_HDR 32 | |
48 | ||
49 | #define MAX_DCCP_HEADER (DCCP_MAX_PACKET_HDR + DCCP_MAX_OPT_LEN + MAX_HEADER) | |
50 | ||
51 | #define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT | |
52 | * state, about 60 seconds */ | |
53 | ||
54 | /* draft-ietf-dccp-spec-11.txt initial RTO value */ | |
55 | #define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ)) | |
56 | ||
57 | /* Maximal interval between probes for local resources. */ | |
58 | #define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U)) | |
59 | ||
60 | #define DCCP_RTO_MAX ((unsigned)(120 * HZ)) /* FIXME: using TCP value */ | |
61 | ||
34ca6860 | 62 | extern struct proto dccp_prot; |
7c657876 ACM |
63 | |
64 | /* is seq1 < seq2 ? */ | |
a10cedd4 | 65 | static inline int before48(const u64 seq1, const u64 seq2) |
7c657876 | 66 | { |
a10cedd4 | 67 | return (s64)((seq1 << 16) - (seq2 << 16)) < 0; |
7c657876 ACM |
68 | } |
69 | ||
70 | /* is seq1 > seq2 ? */ | |
a10cedd4 | 71 | static inline int after48(const u64 seq1, const u64 seq2) |
7c657876 | 72 | { |
a10cedd4 | 73 | return (s64)((seq2 << 16) - (seq1 << 16)) < 0; |
7c657876 ACM |
74 | } |
75 | ||
76 | /* is seq2 <= seq1 <= seq3 ? */ | |
a10cedd4 | 77 | static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3) |
7c657876 ACM |
78 | { |
79 | return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16); | |
80 | } | |
81 | ||
82 | static inline u64 max48(const u64 seq1, const u64 seq2) | |
83 | { | |
84 | return after48(seq1, seq2) ? seq1 : seq2; | |
85 | } | |
86 | ||
87 | enum { | |
88 | DCCP_MIB_NUM = 0, | |
89 | DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */ | |
90 | DCCP_MIB_ESTABRESETS, /* EstabResets */ | |
91 | DCCP_MIB_CURRESTAB, /* CurrEstab */ | |
92 | DCCP_MIB_OUTSEGS, /* OutSegs */ | |
93 | DCCP_MIB_OUTRSTS, | |
94 | DCCP_MIB_ABORTONTIMEOUT, | |
95 | DCCP_MIB_TIMEOUTS, | |
96 | DCCP_MIB_ABORTFAILED, | |
97 | DCCP_MIB_PASSIVEOPENS, | |
98 | DCCP_MIB_ATTEMPTFAILS, | |
99 | DCCP_MIB_OUTDATAGRAMS, | |
100 | DCCP_MIB_INERRS, | |
101 | DCCP_MIB_OPTMANDATORYERROR, | |
102 | DCCP_MIB_INVALIDOPT, | |
103 | __DCCP_MIB_MAX | |
104 | }; | |
105 | ||
106 | #define DCCP_MIB_MAX __DCCP_MIB_MAX | |
107 | struct dccp_mib { | |
108 | unsigned long mibs[DCCP_MIB_MAX]; | |
109 | } __SNMP_MIB_ALIGN__; | |
110 | ||
111 | DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics); | |
7690af3f ACM |
112 | #define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field) |
113 | #define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field) | |
114 | #define DCCP_INC_STATS_USER(field) SNMP_INC_STATS_USER(dccp_statistics, field) | |
115 | #define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field) | |
116 | #define DCCP_ADD_STATS_BH(field, val) \ | |
117 | SNMP_ADD_STATS_BH(dccp_statistics, field, val) | |
118 | #define DCCP_ADD_STATS_USER(field, val) \ | |
119 | SNMP_ADD_STATS_USER(dccp_statistics, field, val) | |
7c657876 | 120 | |
7c657876 ACM |
121 | extern int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb); |
122 | ||
123 | extern int dccp_send_response(struct sock *sk); | |
124 | extern void dccp_send_ack(struct sock *sk); | |
125 | extern void dccp_send_delayed_ack(struct sock *sk); | |
e92ae93a ACM |
126 | extern void dccp_send_sync(struct sock *sk, const u64 seq, |
127 | const enum dccp_pkt_type pkt_type); | |
7c657876 | 128 | |
d6809c12 | 129 | extern int dccp_write_xmit(struct sock *sk, struct sk_buff *skb, long *timeo); |
c530cfb1 | 130 | extern void dccp_write_space(struct sock *sk); |
27258ee5 | 131 | |
7c657876 ACM |
132 | extern void dccp_init_xmit_timers(struct sock *sk); |
133 | static inline void dccp_clear_xmit_timers(struct sock *sk) | |
134 | { | |
135 | inet_csk_clear_xmit_timers(sk); | |
136 | } | |
137 | ||
138 | extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu); | |
139 | ||
140 | extern const char *dccp_packet_name(const int type); | |
141 | extern const char *dccp_state_name(const int state); | |
142 | ||
143 | static inline void dccp_set_state(struct sock *sk, const int state) | |
144 | { | |
145 | const int oldstate = sk->sk_state; | |
146 | ||
147 | dccp_pr_debug("%s(%p) %-10.10s -> %s\n", | |
148 | dccp_role(sk), sk, | |
149 | dccp_state_name(oldstate), dccp_state_name(state)); | |
150 | WARN_ON(state == oldstate); | |
151 | ||
152 | switch (state) { | |
153 | case DCCP_OPEN: | |
154 | if (oldstate != DCCP_OPEN) | |
155 | DCCP_INC_STATS(DCCP_MIB_CURRESTAB); | |
156 | break; | |
157 | ||
158 | case DCCP_CLOSED: | |
159 | if (oldstate == DCCP_CLOSING || oldstate == DCCP_OPEN) | |
160 | DCCP_INC_STATS(DCCP_MIB_ESTABRESETS); | |
161 | ||
162 | sk->sk_prot->unhash(sk); | |
163 | if (inet_csk(sk)->icsk_bind_hash != NULL && | |
164 | !(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) | |
165 | inet_put_port(&dccp_hashinfo, sk); | |
166 | /* fall through */ | |
167 | default: | |
168 | if (oldstate == DCCP_OPEN) | |
169 | DCCP_DEC_STATS(DCCP_MIB_CURRESTAB); | |
170 | } | |
171 | ||
172 | /* Change state AFTER socket is unhashed to avoid closed | |
173 | * socket sitting in hash tables. | |
174 | */ | |
175 | sk->sk_state = state; | |
176 | } | |
177 | ||
178 | static inline void dccp_done(struct sock *sk) | |
179 | { | |
180 | dccp_set_state(sk, DCCP_CLOSED); | |
181 | dccp_clear_xmit_timers(sk); | |
182 | ||
183 | sk->sk_shutdown = SHUTDOWN_MASK; | |
184 | ||
185 | if (!sock_flag(sk, SOCK_DEAD)) | |
186 | sk->sk_state_change(sk); | |
187 | else | |
188 | inet_csk_destroy_sock(sk); | |
189 | } | |
190 | ||
191 | static inline void dccp_openreq_init(struct request_sock *req, | |
192 | struct dccp_sock *dp, | |
193 | struct sk_buff *skb) | |
194 | { | |
195 | /* | |
196 | * FIXME: fill in the other req fields from the DCCP options | |
197 | * received | |
198 | */ | |
199 | inet_rsk(req)->rmt_port = dccp_hdr(skb)->dccph_sport; | |
200 | inet_rsk(req)->acked = 0; | |
201 | req->rcv_wnd = 0; | |
202 | } | |
203 | ||
7c657876 ACM |
204 | extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb); |
205 | ||
206 | extern struct sock *dccp_create_openreq_child(struct sock *sk, | |
207 | const struct request_sock *req, | |
208 | const struct sk_buff *skb); | |
209 | ||
210 | extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb); | |
211 | ||
212 | extern void dccp_v4_err(struct sk_buff *skb, u32); | |
213 | ||
214 | extern int dccp_v4_rcv(struct sk_buff *skb); | |
215 | ||
216 | extern struct sock *dccp_v4_request_recv_sock(struct sock *sk, | |
217 | struct sk_buff *skb, | |
218 | struct request_sock *req, | |
219 | struct dst_entry *dst); | |
220 | extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb, | |
221 | struct request_sock *req, | |
222 | struct request_sock **prev); | |
223 | ||
224 | extern int dccp_child_process(struct sock *parent, struct sock *child, | |
225 | struct sk_buff *skb); | |
226 | extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb, | |
227 | struct dccp_hdr *dh, unsigned len); | |
228 | extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb, | |
229 | const struct dccp_hdr *dh, const unsigned len); | |
230 | ||
231 | extern void dccp_close(struct sock *sk, long timeout); | |
232 | extern struct sk_buff *dccp_make_response(struct sock *sk, | |
233 | struct dst_entry *dst, | |
234 | struct request_sock *req); | |
a1d3a355 ACM |
235 | extern struct sk_buff *dccp_make_reset(struct sock *sk, |
236 | struct dst_entry *dst, | |
237 | enum dccp_reset_codes code); | |
7c657876 ACM |
238 | |
239 | extern int dccp_connect(struct sock *sk); | |
240 | extern int dccp_disconnect(struct sock *sk, int flags); | |
241 | extern int dccp_getsockopt(struct sock *sk, int level, int optname, | |
a1d3a355 ACM |
242 | char __user *optval, int __user *optlen); |
243 | extern int dccp_setsockopt(struct sock *sk, int level, int optname, | |
244 | char __user *optval, int optlen); | |
7c657876 | 245 | extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg); |
7690af3f ACM |
246 | extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, |
247 | struct msghdr *msg, size_t size); | |
7c657876 ACM |
248 | extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, |
249 | struct msghdr *msg, size_t len, int nonblock, | |
250 | int flags, int *addr_len); | |
7c657876 ACM |
251 | extern void dccp_shutdown(struct sock *sk, int how); |
252 | ||
95b81ef7 YN |
253 | extern int dccp_v4_checksum(const struct sk_buff *skb, |
254 | const u32 saddr, const u32 daddr); | |
7c657876 | 255 | |
7690af3f ACM |
256 | extern int dccp_v4_send_reset(struct sock *sk, |
257 | enum dccp_reset_codes code); | |
7ad07e7c | 258 | extern void dccp_send_close(struct sock *sk, const int active); |
7c657876 ACM |
259 | |
260 | struct dccp_skb_cb { | |
67e6b629 ACM |
261 | __u8 dccpd_type:4; |
262 | __u8 dccpd_ccval:4; | |
263 | __u8 dccpd_reset_code; | |
264 | __u16 dccpd_opt_len; | |
7c657876 ACM |
265 | __u64 dccpd_seq; |
266 | __u64 dccpd_ack_seq; | |
7c657876 ACM |
267 | }; |
268 | ||
269 | #define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0])) | |
270 | ||
271 | static inline int dccp_non_data_packet(const struct sk_buff *skb) | |
272 | { | |
273 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; | |
274 | ||
275 | return type == DCCP_PKT_ACK || | |
276 | type == DCCP_PKT_CLOSE || | |
277 | type == DCCP_PKT_CLOSEREQ || | |
278 | type == DCCP_PKT_RESET || | |
279 | type == DCCP_PKT_SYNC || | |
280 | type == DCCP_PKT_SYNCACK; | |
281 | } | |
282 | ||
283 | static inline int dccp_packet_without_ack(const struct sk_buff *skb) | |
284 | { | |
285 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; | |
286 | ||
287 | return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST; | |
288 | } | |
289 | ||
290 | #define DCCP_MAX_SEQNO ((((u64)1) << 48) - 1) | |
291 | #define DCCP_PKT_WITHOUT_ACK_SEQ (DCCP_MAX_SEQNO << 2) | |
292 | ||
293 | static inline void dccp_set_seqno(u64 *seqno, u64 value) | |
294 | { | |
295 | if (value > DCCP_MAX_SEQNO) | |
296 | value -= DCCP_MAX_SEQNO + 1; | |
297 | *seqno = value; | |
298 | } | |
299 | ||
300 | static inline u64 dccp_delta_seqno(u64 seqno1, u64 seqno2) | |
301 | { | |
302 | return ((seqno2 << 16) - (seqno1 << 16)) >> 16; | |
303 | } | |
304 | ||
305 | static inline void dccp_inc_seqno(u64 *seqno) | |
306 | { | |
307 | if (++*seqno > DCCP_MAX_SEQNO) | |
308 | *seqno = 0; | |
309 | } | |
310 | ||
311 | static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss) | |
312 | { | |
7690af3f ACM |
313 | struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh + |
314 | sizeof(*dh)); | |
7c657876 ACM |
315 | |
316 | #if defined(__LITTLE_ENDIAN_BITFIELD) | |
317 | dh->dccph_seq = htonl((gss >> 32)) >> 8; | |
318 | #elif defined(__BIG_ENDIAN_BITFIELD) | |
319 | dh->dccph_seq = htonl((gss >> 32)); | |
320 | #else | |
321 | #error "Adjust your <asm/byteorder.h> defines" | |
322 | #endif | |
323 | dhx->dccph_seq_low = htonl(gss & 0xffffffff); | |
324 | } | |
325 | ||
7690af3f ACM |
326 | static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack, |
327 | const u64 gsr) | |
7c657876 ACM |
328 | { |
329 | #if defined(__LITTLE_ENDIAN_BITFIELD) | |
330 | dhack->dccph_ack_nr_high = htonl((gsr >> 32)) >> 8; | |
331 | #elif defined(__BIG_ENDIAN_BITFIELD) | |
332 | dhack->dccph_ack_nr_high = htonl((gsr >> 32)); | |
333 | #else | |
334 | #error "Adjust your <asm/byteorder.h> defines" | |
335 | #endif | |
336 | dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff); | |
337 | } | |
338 | ||
339 | static inline void dccp_update_gsr(struct sock *sk, u64 seq) | |
340 | { | |
341 | struct dccp_sock *dp = dccp_sk(sk); | |
7c657876 | 342 | |
03ace394 ACM |
343 | dp->dccps_gsr = seq; |
344 | dccp_set_seqno(&dp->dccps_swl, | |
7690af3f ACM |
345 | (dp->dccps_gsr + 1 - |
346 | (dp->dccps_options.dccpo_sequence_window / 4))); | |
7c657876 | 347 | dccp_set_seqno(&dp->dccps_swh, |
7690af3f ACM |
348 | (dp->dccps_gsr + |
349 | (3 * dp->dccps_options.dccpo_sequence_window) / 4)); | |
7c657876 ACM |
350 | } |
351 | ||
352 | static inline void dccp_update_gss(struct sock *sk, u64 seq) | |
353 | { | |
354 | struct dccp_sock *dp = dccp_sk(sk); | |
7c657876 | 355 | |
03ace394 ACM |
356 | dp->dccps_awh = dp->dccps_gss = seq; |
357 | dccp_set_seqno(&dp->dccps_awl, | |
7690af3f ACM |
358 | (dp->dccps_gss - |
359 | dp->dccps_options.dccpo_sequence_window + 1)); | |
7c657876 | 360 | } |
ae31c339 ACM |
361 | |
362 | static inline int dccp_ack_pending(const struct sock *sk) | |
363 | { | |
364 | const struct dccp_sock *dp = dccp_sk(sk); | |
365 | return dp->dccps_timestamp_echo != 0 || | |
366 | #ifdef CONFIG_IP_DCCP_ACKVEC | |
367 | (dp->dccps_options.dccpo_send_ack_vector && | |
368 | dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) || | |
369 | #endif | |
370 | inet_csk_ack_scheduled(sk); | |
371 | } | |
7c657876 ACM |
372 | |
373 | extern void dccp_insert_options(struct sock *sk, struct sk_buff *skb); | |
374 | extern void dccp_insert_option_elapsed_time(struct sock *sk, | |
375 | struct sk_buff *skb, | |
376 | u32 elapsed_time); | |
d4b81ff7 ACM |
377 | extern void dccp_insert_option_timestamp(struct sock *sk, |
378 | struct sk_buff *skb); | |
7c657876 ACM |
379 | extern void dccp_insert_option(struct sock *sk, struct sk_buff *skb, |
380 | unsigned char option, | |
381 | const void *value, unsigned char len); | |
382 | ||
383 | extern struct socket *dccp_ctl_socket; | |
384 | ||
b0e56780 ACM |
385 | extern void dccp_timestamp(const struct sock *sk, struct timeval *tv); |
386 | ||
b6ee3d4a ACM |
387 | static inline suseconds_t timeval_usecs(const struct timeval *tv) |
388 | { | |
389 | return tv->tv_sec * USEC_PER_SEC + tv->tv_usec; | |
390 | } | |
391 | ||
392 | static inline suseconds_t timeval_delta(const struct timeval *large, | |
393 | const struct timeval *small) | |
394 | { | |
395 | time_t secs = large->tv_sec - small->tv_sec; | |
396 | suseconds_t usecs = large->tv_usec - small->tv_usec; | |
397 | ||
398 | if (usecs < 0) { | |
399 | secs--; | |
400 | usecs += USEC_PER_SEC; | |
401 | } | |
402 | return secs * USEC_PER_SEC + usecs; | |
403 | } | |
404 | ||
405 | static inline void timeval_add_usecs(struct timeval *tv, | |
406 | const suseconds_t usecs) | |
407 | { | |
408 | tv->tv_usec += usecs; | |
409 | while (tv->tv_usec >= USEC_PER_SEC) { | |
410 | tv->tv_sec++; | |
411 | tv->tv_usec -= USEC_PER_SEC; | |
412 | } | |
413 | } | |
414 | ||
415 | static inline void timeval_sub_usecs(struct timeval *tv, | |
416 | const suseconds_t usecs) | |
417 | { | |
418 | tv->tv_usec -= usecs; | |
419 | while (tv->tv_usec < 0) { | |
420 | tv->tv_sec--; | |
421 | tv->tv_usec += USEC_PER_SEC; | |
422 | } | |
423 | } | |
424 | ||
7c657876 | 425 | #endif /* _DCCP_H */ |