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 extern void dccp_set_state(struct sock *sk, const int state);
142 extern void dccp_done(struct sock *sk);
144 static inline void dccp_openreq_init(struct request_sock *req,
145 struct dccp_sock *dp,
149 * FIXME: fill in the other req fields from the DCCP options
152 inet_rsk(req)->rmt_port = dccp_hdr(skb)->dccph_sport;
153 inet_rsk(req)->acked = 0;
157 extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb);
159 extern struct sock *dccp_create_openreq_child(struct sock *sk,
160 const struct request_sock *req,
161 const struct sk_buff *skb);
163 extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb);
165 extern struct sock *dccp_v4_request_recv_sock(struct sock *sk,
167 struct request_sock *req,
168 struct dst_entry *dst);
169 extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb,
170 struct request_sock *req,
171 struct request_sock **prev);
173 extern int dccp_child_process(struct sock *parent, struct sock *child,
174 struct sk_buff *skb);
175 extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
176 struct dccp_hdr *dh, unsigned len);
177 extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
178 const struct dccp_hdr *dh, const unsigned len);
180 extern int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized);
181 extern int dccp_destroy_sock(struct sock *sk);
183 extern void dccp_close(struct sock *sk, long timeout);
184 extern struct sk_buff *dccp_make_response(struct sock *sk,
185 struct dst_entry *dst,
186 struct request_sock *req);
188 extern int dccp_connect(struct sock *sk);
189 extern int dccp_disconnect(struct sock *sk, int flags);
190 extern void dccp_hash(struct sock *sk);
191 extern void dccp_unhash(struct sock *sk);
192 extern int dccp_getsockopt(struct sock *sk, int level, int optname,
193 char __user *optval, int __user *optlen);
194 extern int dccp_setsockopt(struct sock *sk, int level, int optname,
195 char __user *optval, int optlen);
196 extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg);
197 extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk,
198 struct msghdr *msg, size_t size);
199 extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk,
200 struct msghdr *msg, size_t len, int nonblock,
201 int flags, int *addr_len);
202 extern void dccp_shutdown(struct sock *sk, int how);
203 extern int inet_dccp_listen(struct socket *sock, int backlog);
204 extern unsigned int dccp_poll(struct file *file, struct socket *sock,
206 extern void dccp_v4_send_check(struct sock *sk, int len,
207 struct sk_buff *skb);
208 extern int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr,
211 extern int dccp_v4_checksum(const struct sk_buff *skb,
212 const __be32 saddr, const __be32 daddr);
214 extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code);
215 extern void dccp_send_close(struct sock *sk, const int active);
216 extern int dccp_invalid_packet(struct sk_buff *skb);
218 static inline int dccp_bad_service_code(const struct sock *sk,
219 const __be32 service)
221 const struct dccp_sock *dp = dccp_sk(sk);
223 if (dp->dccps_service == service)
225 return !dccp_list_has_service(dp->dccps_service_list, service);
231 __u8 dccpd_reset_code;
237 #define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0]))
239 static inline int dccp_non_data_packet(const struct sk_buff *skb)
241 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
243 return type == DCCP_PKT_ACK ||
244 type == DCCP_PKT_CLOSE ||
245 type == DCCP_PKT_CLOSEREQ ||
246 type == DCCP_PKT_RESET ||
247 type == DCCP_PKT_SYNC ||
248 type == DCCP_PKT_SYNCACK;
251 static inline int dccp_packet_without_ack(const struct sk_buff *skb)
253 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
255 return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST;
258 #define DCCP_MAX_SEQNO ((((u64)1) << 48) - 1)
259 #define DCCP_PKT_WITHOUT_ACK_SEQ (DCCP_MAX_SEQNO << 2)
261 static inline void dccp_set_seqno(u64 *seqno, u64 value)
263 if (value > DCCP_MAX_SEQNO)
264 value -= DCCP_MAX_SEQNO + 1;
268 static inline u64 dccp_delta_seqno(u64 seqno1, u64 seqno2)
270 return ((seqno2 << 16) - (seqno1 << 16)) >> 16;
273 static inline void dccp_inc_seqno(u64 *seqno)
275 if (++*seqno > DCCP_MAX_SEQNO)
279 static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss)
281 struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh +
284 dh->dccph_seq = htons((gss >> 32) & 0xfffff);
285 dhx->dccph_seq_low = htonl(gss & 0xffffffff);
288 static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack,
291 dhack->dccph_reserved1 = 0;
292 dhack->dccph_ack_nr_high = htons(gsr >> 32);
293 dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff);
296 static inline void dccp_update_gsr(struct sock *sk, u64 seq)
298 struct dccp_sock *dp = dccp_sk(sk);
301 dccp_set_seqno(&dp->dccps_swl,
303 (dp->dccps_options.dccpo_sequence_window / 4)));
304 dccp_set_seqno(&dp->dccps_swh,
306 (3 * dp->dccps_options.dccpo_sequence_window) / 4));
309 static inline void dccp_update_gss(struct sock *sk, u64 seq)
311 struct dccp_sock *dp = dccp_sk(sk);
313 dp->dccps_awh = dp->dccps_gss = seq;
314 dccp_set_seqno(&dp->dccps_awl,
316 dp->dccps_options.dccpo_sequence_window + 1));
319 static inline int dccp_ack_pending(const struct sock *sk)
321 const struct dccp_sock *dp = dccp_sk(sk);
322 return dp->dccps_timestamp_echo != 0 ||
323 #ifdef CONFIG_IP_DCCP_ACKVEC
324 (dp->dccps_options.dccpo_send_ack_vector &&
325 dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) ||
327 inet_csk_ack_scheduled(sk);
330 extern void dccp_insert_options(struct sock *sk, struct sk_buff *skb);
331 extern void dccp_insert_option_elapsed_time(struct sock *sk,
334 extern void dccp_insert_option_timestamp(struct sock *sk,
335 struct sk_buff *skb);
336 extern void dccp_insert_option(struct sock *sk, struct sk_buff *skb,
337 unsigned char option,
338 const void *value, unsigned char len);
340 extern void dccp_timestamp(const struct sock *sk, struct timeval *tv);
342 static inline suseconds_t timeval_usecs(const struct timeval *tv)
344 return tv->tv_sec * USEC_PER_SEC + tv->tv_usec;
347 static inline suseconds_t timeval_delta(const struct timeval *large,
348 const struct timeval *small)
350 time_t secs = large->tv_sec - small->tv_sec;
351 suseconds_t usecs = large->tv_usec - small->tv_usec;
355 usecs += USEC_PER_SEC;
357 return secs * USEC_PER_SEC + usecs;
360 static inline void timeval_add_usecs(struct timeval *tv,
361 const suseconds_t usecs)
363 tv->tv_usec += usecs;
364 while (tv->tv_usec >= USEC_PER_SEC) {
366 tv->tv_usec -= USEC_PER_SEC;
370 static inline void timeval_sub_usecs(struct timeval *tv,
371 const suseconds_t usecs)
373 tv->tv_usec -= usecs;
374 while (tv->tv_usec < 0) {
376 tv->tv_usec += USEC_PER_SEC;
381 extern int dccp_sysctl_init(void);
382 extern void dccp_sysctl_exit(void);
384 static inline int dccp_sysctl_init(void)
389 static inline void dccp_sysctl_exit(void)