6 * An implementation of the DCCP protocol
7 * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
8 * Copyright (c) 2005 Ian McDonald <iam4@cs.waikato.ac.nz>
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.
15 #include <linux/config.h>
16 #include <linux/dccp.h>
22 #ifdef CONFIG_IP_DCCP_DEBUG
23 extern int dccp_debug
;
25 #define dccp_pr_debug(format, a...) \
26 do { if (dccp_debug) \
27 printk(KERN_DEBUG "%s: " format, __FUNCTION__ , ##a); \
29 #define dccp_pr_debug_cat(format, a...) do { if (dccp_debug) \
30 printk(format, ##a); } while (0)
32 #define dccp_pr_debug(format, a...)
33 #define dccp_pr_debug_cat(format, a...)
36 extern struct inet_hashinfo dccp_hashinfo
;
38 extern atomic_t dccp_orphan_count
;
39 extern int dccp_tw_count
;
40 extern void dccp_tw_deschedule(struct inet_timewait_sock
*tw
);
42 extern void dccp_time_wait(struct sock
*sk
, int state
, int timeo
);
44 /* FIXME: Right size this */
45 #define DCCP_MAX_OPT_LEN 128
47 #define DCCP_MAX_PACKET_HDR 32
49 #define MAX_DCCP_HEADER (DCCP_MAX_PACKET_HDR + DCCP_MAX_OPT_LEN + MAX_HEADER)
51 #define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT
52 * state, about 60 seconds */
54 /* draft-ietf-dccp-spec-11.txt initial RTO value */
55 #define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ))
57 /* Maximal interval between probes for local resources. */
58 #define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U))
60 #define DCCP_RTO_MAX ((unsigned)(120 * HZ)) /* FIXME: using TCP value */
62 /* is seq1 < seq2 ? */
63 static inline int before48(const u64 seq1
, const u64 seq2
)
65 return (s64
)((seq1
<< 16) - (seq2
<< 16)) < 0;
68 /* is seq1 > seq2 ? */
69 static inline int after48(const u64 seq1
, const u64 seq2
)
71 return (s64
)((seq2
<< 16) - (seq1
<< 16)) < 0;
74 /* is seq2 <= seq1 <= seq3 ? */
75 static inline int between48(const u64 seq1
, const u64 seq2
, const u64 seq3
)
77 return (seq3
<< 16) - (seq2
<< 16) >= (seq1
<< 16) - (seq2
<< 16);
80 static inline u64
max48(const u64 seq1
, const u64 seq2
)
82 return after48(seq1
, seq2
) ? seq1
: seq2
;
87 DCCP_MIB_ACTIVEOPENS
, /* ActiveOpens */
88 DCCP_MIB_ESTABRESETS
, /* EstabResets */
89 DCCP_MIB_CURRESTAB
, /* CurrEstab */
90 DCCP_MIB_OUTSEGS
, /* OutSegs */
92 DCCP_MIB_ABORTONTIMEOUT
,
95 DCCP_MIB_PASSIVEOPENS
,
96 DCCP_MIB_ATTEMPTFAILS
,
97 DCCP_MIB_OUTDATAGRAMS
,
99 DCCP_MIB_OPTMANDATORYERROR
,
104 #define DCCP_MIB_MAX __DCCP_MIB_MAX
106 unsigned long mibs
[DCCP_MIB_MAX
];
107 } __SNMP_MIB_ALIGN__
;
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) \
115 SNMP_ADD_STATS_BH(dccp_statistics, field, val)
116 #define DCCP_ADD_STATS_USER(field, val) \
117 SNMP_ADD_STATS_USER(dccp_statistics, field, val)
119 extern int dccp_retransmit_skb(struct sock
*sk
, struct sk_buff
*skb
);
121 extern int dccp_send_response(struct sock
*sk
);
122 extern void dccp_send_ack(struct sock
*sk
);
123 extern void dccp_send_delayed_ack(struct sock
*sk
);
124 extern void dccp_send_sync(struct sock
*sk
, const u64 seq
,
125 const enum dccp_pkt_type pkt_type
);
127 extern int dccp_write_xmit(struct sock
*sk
, struct sk_buff
*skb
, long *timeo
);
128 extern void dccp_write_space(struct sock
*sk
);
130 extern void dccp_init_xmit_timers(struct sock
*sk
);
131 static inline void dccp_clear_xmit_timers(struct sock
*sk
)
133 inet_csk_clear_xmit_timers(sk
);
136 extern unsigned int dccp_sync_mss(struct sock
*sk
, u32 pmtu
);
138 extern const char *dccp_packet_name(const int type
);
139 extern const char *dccp_state_name(const int state
);
141 static inline void dccp_set_state(struct sock
*sk
, const int state
)
143 const int oldstate
= sk
->sk_state
;
145 dccp_pr_debug("%s(%p) %-10.10s -> %s\n",
147 dccp_state_name(oldstate
), dccp_state_name(state
));
148 WARN_ON(state
== oldstate
);
152 if (oldstate
!= DCCP_OPEN
)
153 DCCP_INC_STATS(DCCP_MIB_CURRESTAB
);
157 if (oldstate
== DCCP_CLOSING
|| oldstate
== DCCP_OPEN
)
158 DCCP_INC_STATS(DCCP_MIB_ESTABRESETS
);
160 sk
->sk_prot
->unhash(sk
);
161 if (inet_csk(sk
)->icsk_bind_hash
!= NULL
&&
162 !(sk
->sk_userlocks
& SOCK_BINDPORT_LOCK
))
163 inet_put_port(&dccp_hashinfo
, sk
);
166 if (oldstate
== DCCP_OPEN
)
167 DCCP_DEC_STATS(DCCP_MIB_CURRESTAB
);
170 /* Change state AFTER socket is unhashed to avoid closed
171 * socket sitting in hash tables.
173 sk
->sk_state
= state
;
176 static inline void dccp_done(struct sock
*sk
)
178 dccp_set_state(sk
, DCCP_CLOSED
);
179 dccp_clear_xmit_timers(sk
);
181 sk
->sk_shutdown
= SHUTDOWN_MASK
;
183 if (!sock_flag(sk
, SOCK_DEAD
))
184 sk
->sk_state_change(sk
);
186 inet_csk_destroy_sock(sk
);
189 static inline void dccp_openreq_init(struct request_sock
*req
,
190 struct dccp_sock
*dp
,
194 * FIXME: fill in the other req fields from the DCCP options
197 inet_rsk(req
)->rmt_port
= dccp_hdr(skb
)->dccph_sport
;
198 inet_rsk(req
)->acked
= 0;
202 extern int dccp_v4_conn_request(struct sock
*sk
, struct sk_buff
*skb
);
204 extern struct sock
*dccp_create_openreq_child(struct sock
*sk
,
205 const struct request_sock
*req
,
206 const struct sk_buff
*skb
);
208 extern int dccp_v4_do_rcv(struct sock
*sk
, struct sk_buff
*skb
);
210 extern struct sock
*dccp_v4_request_recv_sock(struct sock
*sk
,
212 struct request_sock
*req
,
213 struct dst_entry
*dst
);
214 extern struct sock
*dccp_check_req(struct sock
*sk
, struct sk_buff
*skb
,
215 struct request_sock
*req
,
216 struct request_sock
**prev
);
218 extern int dccp_child_process(struct sock
*parent
, struct sock
*child
,
219 struct sk_buff
*skb
);
220 extern int dccp_rcv_state_process(struct sock
*sk
, struct sk_buff
*skb
,
221 struct dccp_hdr
*dh
, unsigned len
);
222 extern int dccp_rcv_established(struct sock
*sk
, struct sk_buff
*skb
,
223 const struct dccp_hdr
*dh
, const unsigned len
);
225 extern int dccp_init_sock(struct sock
*sk
);
226 extern int dccp_destroy_sock(struct sock
*sk
);
228 extern void dccp_close(struct sock
*sk
, long timeout
);
229 extern struct sk_buff
*dccp_make_response(struct sock
*sk
,
230 struct dst_entry
*dst
,
231 struct request_sock
*req
);
233 extern int dccp_connect(struct sock
*sk
);
234 extern int dccp_disconnect(struct sock
*sk
, int flags
);
235 extern void dccp_hash(struct sock
*sk
);
236 extern void dccp_unhash(struct sock
*sk
);
237 extern int dccp_getsockopt(struct sock
*sk
, int level
, int optname
,
238 char __user
*optval
, int __user
*optlen
);
239 extern int dccp_setsockopt(struct sock
*sk
, int level
, int optname
,
240 char __user
*optval
, int optlen
);
241 extern int dccp_ioctl(struct sock
*sk
, int cmd
, unsigned long arg
);
242 extern int dccp_sendmsg(struct kiocb
*iocb
, struct sock
*sk
,
243 struct msghdr
*msg
, size_t size
);
244 extern int dccp_recvmsg(struct kiocb
*iocb
, struct sock
*sk
,
245 struct msghdr
*msg
, size_t len
, int nonblock
,
246 int flags
, int *addr_len
);
247 extern void dccp_shutdown(struct sock
*sk
, int how
);
248 extern int inet_dccp_listen(struct socket
*sock
, int backlog
);
249 extern unsigned int dccp_poll(struct file
*file
, struct socket
*sock
,
251 extern void dccp_v4_send_check(struct sock
*sk
, int len
,
252 struct sk_buff
*skb
);
253 extern int dccp_v4_connect(struct sock
*sk
, struct sockaddr
*uaddr
,
256 extern int dccp_v4_checksum(const struct sk_buff
*skb
,
257 const __be32 saddr
, const __be32 daddr
);
259 extern int dccp_send_reset(struct sock
*sk
, enum dccp_reset_codes code
);
260 extern void dccp_send_close(struct sock
*sk
, const int active
);
261 extern int dccp_invalid_packet(struct sk_buff
*skb
);
263 static inline int dccp_bad_service_code(const struct sock
*sk
,
264 const __be32 service
)
266 const struct dccp_sock
*dp
= dccp_sk(sk
);
268 if (dp
->dccps_service
== service
)
270 return !dccp_list_has_service(dp
->dccps_service_list
, service
);
276 __u8 dccpd_reset_code
;
282 #define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0]))
284 static inline int dccp_non_data_packet(const struct sk_buff
*skb
)
286 const __u8 type
= DCCP_SKB_CB(skb
)->dccpd_type
;
288 return type
== DCCP_PKT_ACK
||
289 type
== DCCP_PKT_CLOSE
||
290 type
== DCCP_PKT_CLOSEREQ
||
291 type
== DCCP_PKT_RESET
||
292 type
== DCCP_PKT_SYNC
||
293 type
== DCCP_PKT_SYNCACK
;
296 static inline int dccp_packet_without_ack(const struct sk_buff
*skb
)
298 const __u8 type
= DCCP_SKB_CB(skb
)->dccpd_type
;
300 return type
== DCCP_PKT_DATA
|| type
== DCCP_PKT_REQUEST
;
303 #define DCCP_MAX_SEQNO ((((u64)1) << 48) - 1)
304 #define DCCP_PKT_WITHOUT_ACK_SEQ (DCCP_MAX_SEQNO << 2)
306 static inline void dccp_set_seqno(u64
*seqno
, u64 value
)
308 if (value
> DCCP_MAX_SEQNO
)
309 value
-= DCCP_MAX_SEQNO
+ 1;
313 static inline u64
dccp_delta_seqno(u64 seqno1
, u64 seqno2
)
315 return ((seqno2
<< 16) - (seqno1
<< 16)) >> 16;
318 static inline void dccp_inc_seqno(u64
*seqno
)
320 if (++*seqno
> DCCP_MAX_SEQNO
)
324 static inline void dccp_hdr_set_seq(struct dccp_hdr
*dh
, const u64 gss
)
326 struct dccp_hdr_ext
*dhx
= (struct dccp_hdr_ext
*)((void *)dh
+
329 dh
->dccph_seq
= htons((gss
>> 32) & 0xfffff);
330 dhx
->dccph_seq_low
= htonl(gss
& 0xffffffff);
333 static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits
*dhack
,
336 dhack
->dccph_reserved1
= 0;
337 dhack
->dccph_ack_nr_high
= htons(gsr
>> 32);
338 dhack
->dccph_ack_nr_low
= htonl(gsr
& 0xffffffff);
341 static inline void dccp_update_gsr(struct sock
*sk
, u64 seq
)
343 struct dccp_sock
*dp
= dccp_sk(sk
);
346 dccp_set_seqno(&dp
->dccps_swl
,
348 (dp
->dccps_options
.dccpo_sequence_window
/ 4)));
349 dccp_set_seqno(&dp
->dccps_swh
,
351 (3 * dp
->dccps_options
.dccpo_sequence_window
) / 4));
354 static inline void dccp_update_gss(struct sock
*sk
, u64 seq
)
356 struct dccp_sock
*dp
= dccp_sk(sk
);
358 dp
->dccps_awh
= dp
->dccps_gss
= seq
;
359 dccp_set_seqno(&dp
->dccps_awl
,
361 dp
->dccps_options
.dccpo_sequence_window
+ 1));
364 static inline int dccp_ack_pending(const struct sock
*sk
)
366 const struct dccp_sock
*dp
= dccp_sk(sk
);
367 return dp
->dccps_timestamp_echo
!= 0 ||
368 #ifdef CONFIG_IP_DCCP_ACKVEC
369 (dp
->dccps_options
.dccpo_send_ack_vector
&&
370 dccp_ackvec_pending(dp
->dccps_hc_rx_ackvec
)) ||
372 inet_csk_ack_scheduled(sk
);
375 extern void dccp_insert_options(struct sock
*sk
, struct sk_buff
*skb
);
376 extern void dccp_insert_option_elapsed_time(struct sock
*sk
,
379 extern void dccp_insert_option_timestamp(struct sock
*sk
,
380 struct sk_buff
*skb
);
381 extern void dccp_insert_option(struct sock
*sk
, struct sk_buff
*skb
,
382 unsigned char option
,
383 const void *value
, unsigned char len
);
385 extern struct socket
*dccp_ctl_socket
;
387 extern void dccp_timestamp(const struct sock
*sk
, struct timeval
*tv
);
389 static inline suseconds_t
timeval_usecs(const struct timeval
*tv
)
391 return tv
->tv_sec
* USEC_PER_SEC
+ tv
->tv_usec
;
394 static inline suseconds_t
timeval_delta(const struct timeval
*large
,
395 const struct timeval
*small
)
397 time_t secs
= large
->tv_sec
- small
->tv_sec
;
398 suseconds_t usecs
= large
->tv_usec
- small
->tv_usec
;
402 usecs
+= USEC_PER_SEC
;
404 return secs
* USEC_PER_SEC
+ usecs
;
407 static inline void timeval_add_usecs(struct timeval
*tv
,
408 const suseconds_t usecs
)
410 tv
->tv_usec
+= usecs
;
411 while (tv
->tv_usec
>= USEC_PER_SEC
) {
413 tv
->tv_usec
-= USEC_PER_SEC
;
417 static inline void timeval_sub_usecs(struct timeval
*tv
,
418 const suseconds_t usecs
)
420 tv
->tv_usec
-= usecs
;
421 while (tv
->tv_usec
< 0) {
423 tv
->tv_usec
+= USEC_PER_SEC
;
428 extern int dccp_sysctl_init(void);
429 extern void dccp_sysctl_exit(void);
431 static inline int dccp_sysctl_init(void)
436 static inline void dccp_sysctl_exit(void)