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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 | |
7 | * Arnaldo Carvalho de Melo <acme@conectiva.com.br> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
13 | ||
14 | #include <linux/dccp.h> | |
15 | #include <net/snmp.h> | |
16 | #include <net/sock.h> | |
17 | #include <net/tcp.h> | |
18 | ||
19 | #define DCCP_DEBUG | |
20 | ||
21 | #ifdef DCCP_DEBUG | |
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) | |
28 | #define dccp_pr_debug_cat(format, a...) do { if (dccp_debug) printk(format, ##a); } while (0) | |
29 | #else | |
30 | #define dccp_pr_debug(format, a...) | |
31 | #define dccp_pr_debug_cat(format, a...) | |
32 | #endif | |
33 | ||
34 | extern struct inet_hashinfo dccp_hashinfo; | |
35 | ||
36 | extern atomic_t dccp_orphan_count; | |
37 | extern int dccp_tw_count; | |
38 | extern void dccp_tw_deschedule(struct inet_timewait_sock *tw); | |
39 | ||
40 | extern void dccp_time_wait(struct sock *sk, int state, int timeo); | |
41 | ||
42 | /* FIXME: Right size this */ | |
43 | #define DCCP_MAX_OPT_LEN 128 | |
44 | ||
45 | #define DCCP_MAX_PACKET_HDR 32 | |
46 | ||
47 | #define MAX_DCCP_HEADER (DCCP_MAX_PACKET_HDR + DCCP_MAX_OPT_LEN + MAX_HEADER) | |
48 | ||
49 | #define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT | |
50 | * state, about 60 seconds */ | |
51 | ||
52 | /* draft-ietf-dccp-spec-11.txt initial RTO value */ | |
53 | #define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ)) | |
54 | ||
55 | /* Maximal interval between probes for local resources. */ | |
56 | #define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U)) | |
57 | ||
58 | #define DCCP_RTO_MAX ((unsigned)(120 * HZ)) /* FIXME: using TCP value */ | |
59 | ||
60 | extern struct proto dccp_v4_prot; | |
61 | ||
62 | /* is seq1 < seq2 ? */ | |
63 | static inline const int before48(const u64 seq1, const u64 seq2) | |
64 | { | |
65 | return (const s64)((seq1 << 16) - (seq2 << 16)) < 0; | |
66 | } | |
67 | ||
68 | /* is seq1 > seq2 ? */ | |
69 | static inline const int after48(const u64 seq1, const u64 seq2) | |
70 | { | |
71 | return (const s64)((seq2 << 16) - (seq1 << 16)) < 0; | |
72 | } | |
73 | ||
74 | /* is seq2 <= seq1 <= seq3 ? */ | |
75 | static inline const int between48(const u64 seq1, const u64 seq2, const u64 seq3) | |
76 | { | |
77 | return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16); | |
78 | } | |
79 | ||
80 | static inline u64 max48(const u64 seq1, const u64 seq2) | |
81 | { | |
82 | return after48(seq1, seq2) ? seq1 : seq2; | |
83 | } | |
84 | ||
85 | enum { | |
86 | DCCP_MIB_NUM = 0, | |
87 | DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */ | |
88 | DCCP_MIB_ESTABRESETS, /* EstabResets */ | |
89 | DCCP_MIB_CURRESTAB, /* CurrEstab */ | |
90 | DCCP_MIB_OUTSEGS, /* OutSegs */ | |
91 | DCCP_MIB_OUTRSTS, | |
92 | DCCP_MIB_ABORTONTIMEOUT, | |
93 | DCCP_MIB_TIMEOUTS, | |
94 | DCCP_MIB_ABORTFAILED, | |
95 | DCCP_MIB_PASSIVEOPENS, | |
96 | DCCP_MIB_ATTEMPTFAILS, | |
97 | DCCP_MIB_OUTDATAGRAMS, | |
98 | DCCP_MIB_INERRS, | |
99 | DCCP_MIB_OPTMANDATORYERROR, | |
100 | DCCP_MIB_INVALIDOPT, | |
101 | __DCCP_MIB_MAX | |
102 | }; | |
103 | ||
104 | #define DCCP_MIB_MAX __DCCP_MIB_MAX | |
105 | struct dccp_mib { | |
106 | unsigned long mibs[DCCP_MIB_MAX]; | |
107 | } __SNMP_MIB_ALIGN__; | |
108 | ||
109 | DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics); | |
110 | #define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field) | |
111 | #define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field) | |
112 | #define DCCP_INC_STATS_USER(field) SNMP_INC_STATS_USER(dccp_statistics, field) | |
113 | #define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field) | |
114 | #define DCCP_ADD_STATS_BH(field, val) SNMP_ADD_STATS_BH(dccp_statistics, field, val) | |
115 | #define DCCP_ADD_STATS_USER(field, val) SNMP_ADD_STATS_USER(dccp_statistics, field, val) | |
116 | ||
117 | extern int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb); | |
118 | extern int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb); | |
119 | ||
120 | extern int dccp_send_response(struct sock *sk); | |
121 | extern void dccp_send_ack(struct sock *sk); | |
122 | extern void dccp_send_delayed_ack(struct sock *sk); | |
123 | extern void dccp_send_sync(struct sock *sk, u64 seq); | |
124 | ||
27258ee5 ACM |
125 | extern int dccp_write_xmit(struct sock *sk, struct sk_buff *skb, |
126 | const int len); | |
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 | ||
139 | static inline void dccp_set_state(struct sock *sk, const int state) | |
140 | { | |
141 | const int oldstate = sk->sk_state; | |
142 | ||
143 | dccp_pr_debug("%s(%p) %-10.10s -> %s\n", | |
144 | dccp_role(sk), sk, | |
145 | dccp_state_name(oldstate), dccp_state_name(state)); | |
146 | WARN_ON(state == oldstate); | |
147 | ||
148 | switch (state) { | |
149 | case DCCP_OPEN: | |
150 | if (oldstate != DCCP_OPEN) | |
151 | DCCP_INC_STATS(DCCP_MIB_CURRESTAB); | |
152 | break; | |
153 | ||
154 | case DCCP_CLOSED: | |
155 | if (oldstate == DCCP_CLOSING || oldstate == DCCP_OPEN) | |
156 | DCCP_INC_STATS(DCCP_MIB_ESTABRESETS); | |
157 | ||
158 | sk->sk_prot->unhash(sk); | |
159 | if (inet_csk(sk)->icsk_bind_hash != NULL && | |
160 | !(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) | |
161 | inet_put_port(&dccp_hashinfo, sk); | |
162 | /* fall through */ | |
163 | default: | |
164 | if (oldstate == DCCP_OPEN) | |
165 | DCCP_DEC_STATS(DCCP_MIB_CURRESTAB); | |
166 | } | |
167 | ||
168 | /* Change state AFTER socket is unhashed to avoid closed | |
169 | * socket sitting in hash tables. | |
170 | */ | |
171 | sk->sk_state = state; | |
172 | } | |
173 | ||
174 | static inline void dccp_done(struct sock *sk) | |
175 | { | |
176 | dccp_set_state(sk, DCCP_CLOSED); | |
177 | dccp_clear_xmit_timers(sk); | |
178 | ||
179 | sk->sk_shutdown = SHUTDOWN_MASK; | |
180 | ||
181 | if (!sock_flag(sk, SOCK_DEAD)) | |
182 | sk->sk_state_change(sk); | |
183 | else | |
184 | inet_csk_destroy_sock(sk); | |
185 | } | |
186 | ||
187 | static inline void dccp_openreq_init(struct request_sock *req, | |
188 | struct dccp_sock *dp, | |
189 | struct sk_buff *skb) | |
190 | { | |
191 | /* | |
192 | * FIXME: fill in the other req fields from the DCCP options | |
193 | * received | |
194 | */ | |
195 | inet_rsk(req)->rmt_port = dccp_hdr(skb)->dccph_sport; | |
196 | inet_rsk(req)->acked = 0; | |
197 | req->rcv_wnd = 0; | |
198 | } | |
199 | ||
7c657876 ACM |
200 | extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb); |
201 | ||
202 | extern struct sock *dccp_create_openreq_child(struct sock *sk, | |
203 | const struct request_sock *req, | |
204 | const struct sk_buff *skb); | |
205 | ||
206 | extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb); | |
207 | ||
208 | extern void dccp_v4_err(struct sk_buff *skb, u32); | |
209 | ||
210 | extern int dccp_v4_rcv(struct sk_buff *skb); | |
211 | ||
212 | extern struct sock *dccp_v4_request_recv_sock(struct sock *sk, | |
213 | struct sk_buff *skb, | |
214 | struct request_sock *req, | |
215 | struct dst_entry *dst); | |
216 | extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb, | |
217 | struct request_sock *req, | |
218 | struct request_sock **prev); | |
219 | ||
220 | extern int dccp_child_process(struct sock *parent, struct sock *child, | |
221 | struct sk_buff *skb); | |
222 | extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb, | |
223 | struct dccp_hdr *dh, unsigned len); | |
224 | extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb, | |
225 | const struct dccp_hdr *dh, const unsigned len); | |
226 | ||
227 | extern void dccp_close(struct sock *sk, long timeout); | |
228 | extern struct sk_buff *dccp_make_response(struct sock *sk, | |
229 | struct dst_entry *dst, | |
230 | struct request_sock *req); | |
231 | ||
232 | extern int dccp_connect(struct sock *sk); | |
233 | extern int dccp_disconnect(struct sock *sk, int flags); | |
234 | extern int dccp_getsockopt(struct sock *sk, int level, int optname, | |
235 | char *optval, int *optlen); | |
236 | extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg); | |
237 | extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, | |
238 | size_t size); | |
239 | extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, | |
240 | struct msghdr *msg, size_t len, int nonblock, | |
241 | int flags, int *addr_len); | |
242 | extern int dccp_setsockopt(struct sock *sk, int level, int optname, | |
243 | char *optval, int optlen); | |
244 | extern void dccp_shutdown(struct sock *sk, int how); | |
245 | ||
95b81ef7 YN |
246 | extern int dccp_v4_checksum(const struct sk_buff *skb, |
247 | const u32 saddr, const u32 daddr); | |
7c657876 ACM |
248 | |
249 | extern int dccp_v4_send_reset(struct sock *sk, enum dccp_reset_codes code); | |
250 | extern void dccp_send_close(struct sock *sk); | |
251 | ||
252 | struct dccp_skb_cb { | |
253 | __u8 dccpd_type; | |
254 | __u8 dccpd_reset_code; | |
255 | __u8 dccpd_service; | |
256 | __u8 dccpd_ccval; | |
257 | __u64 dccpd_seq; | |
258 | __u64 dccpd_ack_seq; | |
259 | int dccpd_opt_len; | |
260 | }; | |
261 | ||
262 | #define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0])) | |
263 | ||
264 | static inline int dccp_non_data_packet(const struct sk_buff *skb) | |
265 | { | |
266 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; | |
267 | ||
268 | return type == DCCP_PKT_ACK || | |
269 | type == DCCP_PKT_CLOSE || | |
270 | type == DCCP_PKT_CLOSEREQ || | |
271 | type == DCCP_PKT_RESET || | |
272 | type == DCCP_PKT_SYNC || | |
273 | type == DCCP_PKT_SYNCACK; | |
274 | } | |
275 | ||
276 | static inline int dccp_packet_without_ack(const struct sk_buff *skb) | |
277 | { | |
278 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; | |
279 | ||
280 | return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST; | |
281 | } | |
282 | ||
283 | #define DCCP_MAX_SEQNO ((((u64)1) << 48) - 1) | |
284 | #define DCCP_PKT_WITHOUT_ACK_SEQ (DCCP_MAX_SEQNO << 2) | |
285 | ||
286 | static inline void dccp_set_seqno(u64 *seqno, u64 value) | |
287 | { | |
288 | if (value > DCCP_MAX_SEQNO) | |
289 | value -= DCCP_MAX_SEQNO + 1; | |
290 | *seqno = value; | |
291 | } | |
292 | ||
293 | static inline u64 dccp_delta_seqno(u64 seqno1, u64 seqno2) | |
294 | { | |
295 | return ((seqno2 << 16) - (seqno1 << 16)) >> 16; | |
296 | } | |
297 | ||
298 | static inline void dccp_inc_seqno(u64 *seqno) | |
299 | { | |
300 | if (++*seqno > DCCP_MAX_SEQNO) | |
301 | *seqno = 0; | |
302 | } | |
303 | ||
304 | static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss) | |
305 | { | |
306 | struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh + sizeof(*dh)); | |
307 | ||
308 | #if defined(__LITTLE_ENDIAN_BITFIELD) | |
309 | dh->dccph_seq = htonl((gss >> 32)) >> 8; | |
310 | #elif defined(__BIG_ENDIAN_BITFIELD) | |
311 | dh->dccph_seq = htonl((gss >> 32)); | |
312 | #else | |
313 | #error "Adjust your <asm/byteorder.h> defines" | |
314 | #endif | |
315 | dhx->dccph_seq_low = htonl(gss & 0xffffffff); | |
316 | } | |
317 | ||
318 | static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack, const u64 gsr) | |
319 | { | |
320 | #if defined(__LITTLE_ENDIAN_BITFIELD) | |
321 | dhack->dccph_ack_nr_high = htonl((gsr >> 32)) >> 8; | |
322 | #elif defined(__BIG_ENDIAN_BITFIELD) | |
323 | dhack->dccph_ack_nr_high = htonl((gsr >> 32)); | |
324 | #else | |
325 | #error "Adjust your <asm/byteorder.h> defines" | |
326 | #endif | |
327 | dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff); | |
328 | } | |
329 | ||
330 | static inline void dccp_update_gsr(struct sock *sk, u64 seq) | |
331 | { | |
332 | struct dccp_sock *dp = dccp_sk(sk); | |
333 | u64 tmp_gsr; | |
334 | ||
335 | dccp_set_seqno(&tmp_gsr, dp->dccps_gsr + 1 - (dp->dccps_options.dccpo_sequence_window / 4)); | |
336 | dp->dccps_gsr = seq; | |
337 | dccp_set_seqno(&dp->dccps_swl, max48(tmp_gsr, dp->dccps_isr)); | |
338 | dccp_set_seqno(&dp->dccps_swh, | |
339 | dp->dccps_gsr + (3 * dp->dccps_options.dccpo_sequence_window) / 4); | |
340 | } | |
341 | ||
342 | static inline void dccp_update_gss(struct sock *sk, u64 seq) | |
343 | { | |
344 | struct dccp_sock *dp = dccp_sk(sk); | |
345 | u64 tmp_gss; | |
346 | ||
347 | dccp_set_seqno(&tmp_gss, dp->dccps_gss - dp->dccps_options.dccpo_sequence_window + 1); | |
348 | dp->dccps_awl = max48(tmp_gss, dp->dccps_iss); | |
349 | dp->dccps_awh = dp->dccps_gss = seq; | |
350 | } | |
351 | ||
352 | extern void dccp_insert_options(struct sock *sk, struct sk_buff *skb); | |
353 | extern void dccp_insert_option_elapsed_time(struct sock *sk, | |
354 | struct sk_buff *skb, | |
355 | u32 elapsed_time); | |
356 | extern void dccp_insert_option(struct sock *sk, struct sk_buff *skb, | |
357 | unsigned char option, | |
358 | const void *value, unsigned char len); | |
359 | ||
360 | extern struct socket *dccp_ctl_socket; | |
361 | ||
362 | #define DCCP_ACKPKTS_STATE_RECEIVED 0 | |
363 | #define DCCP_ACKPKTS_STATE_ECN_MARKED (1 << 6) | |
364 | #define DCCP_ACKPKTS_STATE_NOT_RECEIVED (3 << 6) | |
365 | ||
366 | #define DCCP_ACKPKTS_STATE_MASK 0xC0 /* 11000000 */ | |
367 | #define DCCP_ACKPKTS_LEN_MASK 0x3F /* 00111111 */ | |
368 | ||
369 | /** struct dccp_ackpkts - acknowledgeable packets | |
370 | * | |
371 | * This data structure is the one defined in the DCCP draft | |
372 | * Appendix A. | |
373 | * | |
374 | * @dccpap_buf_head - circular buffer head | |
375 | * @dccpap_buf_tail - circular buffer tail | |
376 | * @dccpap_buf_ackno - ack # of the most recent packet acknoldgeable in the buffer (i.e. %dccpap_buf_head) | |
377 | * @dccpap_buf_nonce - the one-bit sum of the ECN Nonces on all packets acked by the buffer with State 0 | |
378 | * | |
379 | * Additionally, the HC-Receiver must keep some information about the | |
380 | * Ack Vectors it has recently sent. For each packet sent carrying an | |
381 | * Ack Vector, it remembers four variables: | |
382 | * | |
383 | * @dccpap_ack_seqno - the Sequence Number used for the packet (HC-Receiver seqno) | |
384 | * @dccpap_ack_ptr - the value of buf_head at the time of acknowledgement. | |
385 | * @dccpap_ack_ackno - the Acknowledgement Number used for the packet (HC-Sender seqno) | |
386 | * @dccpap_ack_nonce - the one-bit sum of the ECN Nonces for all State 0. | |
387 | * | |
388 | * @dccpap_buf_len - circular buffer length | |
389 | * @dccpap_buf - circular buffer of acknowledgeable packets | |
390 | */ | |
391 | struct dccp_ackpkts { | |
392 | unsigned int dccpap_buf_head; | |
393 | unsigned int dccpap_buf_tail; | |
394 | u64 dccpap_buf_ackno; | |
395 | u64 dccpap_ack_seqno; | |
396 | u64 dccpap_ack_ackno; | |
397 | unsigned int dccpap_ack_ptr; | |
398 | unsigned int dccpap_buf_vector_len; | |
399 | unsigned int dccpap_ack_vector_len; | |
400 | unsigned int dccpap_buf_len; | |
401 | unsigned long dccpap_time; | |
402 | u8 dccpap_buf_nonce; | |
403 | u8 dccpap_ack_nonce; | |
404 | u8 dccpap_buf[0]; | |
405 | }; | |
406 | ||
407 | extern struct dccp_ackpkts *dccp_ackpkts_alloc(unsigned int len, int priority); | |
408 | extern void dccp_ackpkts_free(struct dccp_ackpkts *ap); | |
409 | extern int dccp_ackpkts_add(struct dccp_ackpkts *ap, u64 ackno, u8 state); | |
410 | extern void dccp_ackpkts_check_rcv_ackno(struct dccp_ackpkts *ap, | |
411 | struct sock *sk, u64 ackno); | |
412 | ||
413 | #ifdef DCCP_DEBUG | |
414 | extern void dccp_ackvector_print(const u64 ackno, | |
415 | const unsigned char *vector, int len); | |
416 | extern void dccp_ackpkts_print(const struct dccp_ackpkts *ap); | |
417 | #else | |
418 | static inline void dccp_ackvector_print(const u64 ackno, | |
419 | const unsigned char *vector, | |
420 | int len) { } | |
421 | static inline void dccp_ackpkts_print(const struct dccp_ackpkts *ap) { } | |
422 | #endif | |
423 | ||
424 | #endif /* _DCCP_H */ |