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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 | 7 | * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br> |
e6bccd35 | 8 | * Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.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 | |
3c695262 GR |
21 | #define DCCP_CRIT(fmt, a...) LIMIT_NETDEBUG(KERN_CRIT fmt " at %s:%d/%s()\n", \ |
22 | ##a, __FILE__, __LINE__, __FUNCTION__) | |
23 | #define DCCP_BUG(fmt, a...) do { DCCP_CRIT(fmt, ##a); dump_stack(); } while (0) | |
24 | #define DCCP_BUG_ON(cond) do { if (unlikely((cond) == 0)) \ | |
25 | DCCP_BUG("BUG: condition \"%s\" fails",\ | |
26 | __stringify((cond))); \ | |
27 | } while (0) | |
28 | ||
725ba8ee | 29 | #ifdef CONFIG_IP_DCCP_DEBUG |
7c657876 ACM |
30 | extern int dccp_debug; |
31 | ||
32 | #define dccp_pr_debug(format, a...) \ | |
33 | do { if (dccp_debug) \ | |
34 | printk(KERN_DEBUG "%s: " format, __FUNCTION__ , ##a); \ | |
35 | } while (0) | |
7690af3f ACM |
36 | #define dccp_pr_debug_cat(format, a...) do { if (dccp_debug) \ |
37 | printk(format, ##a); } while (0) | |
7c657876 ACM |
38 | #else |
39 | #define dccp_pr_debug(format, a...) | |
40 | #define dccp_pr_debug_cat(format, a...) | |
41 | #endif | |
42 | ||
43 | extern struct inet_hashinfo dccp_hashinfo; | |
44 | ||
45 | extern atomic_t dccp_orphan_count; | |
7c657876 ACM |
46 | |
47 | extern void dccp_time_wait(struct sock *sk, int state, int timeo); | |
48 | ||
60361be1 GR |
49 | /* |
50 | * Set safe upper bounds for header and option length. Since Data Offset is 8 | |
51 | * bits (RFC 4340, sec. 5.1), the total header length can never be more than | |
52 | * 4 * 255 = 1020 bytes. The largest possible header length is 28 bytes (X=1): | |
53 | * - DCCP-Response with ACK Subheader and 4 bytes of Service code OR | |
54 | * - DCCP-Reset with ACK Subheader and 4 bytes of Reset Code fields | |
55 | * Hence a safe upper bound for the maximum option length is 1020-28 = 992 | |
56 | */ | |
57 | #define MAX_DCCP_SPECIFIC_HEADER (255 * sizeof(int)) | |
58 | #define DCCP_MAX_PACKET_HDR 28 | |
59 | #define DCCP_MAX_OPT_LEN (MAX_DCCP_SPECIFIC_HEADER - DCCP_MAX_PACKET_HDR) | |
60 | #define MAX_DCCP_HEADER (MAX_DCCP_SPECIFIC_HEADER + MAX_HEADER) | |
7c657876 ACM |
61 | |
62 | #define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT | |
63 | * state, about 60 seconds */ | |
64 | ||
0e64e94e | 65 | /* RFC 1122, 4.2.3.1 initial RTO value */ |
7c657876 ACM |
66 | #define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ)) |
67 | ||
68 | /* Maximal interval between probes for local resources. */ | |
69 | #define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U)) | |
70 | ||
71 | #define DCCP_RTO_MAX ((unsigned)(120 * HZ)) /* FIXME: using TCP value */ | |
72 | ||
f45b3ec4 IM |
73 | #define DCCP_XMIT_TIMEO 30000 /* Time/msecs for blocking transmit per packet */ |
74 | ||
2e2e9e92 GR |
75 | /* sysctl variables for DCCP */ |
76 | extern int sysctl_dccp_request_retries; | |
77 | extern int sysctl_dccp_retries1; | |
78 | extern int sysctl_dccp_retries2; | |
afb0a34d GR |
79 | extern int sysctl_dccp_feat_sequence_window; |
80 | extern int sysctl_dccp_feat_rx_ccid; | |
81 | extern int sysctl_dccp_feat_tx_ccid; | |
82 | extern int sysctl_dccp_feat_ack_ratio; | |
83 | extern int sysctl_dccp_feat_send_ack_vector; | |
84 | extern int sysctl_dccp_feat_send_ndp_count; | |
2e2e9e92 | 85 | |
7c657876 | 86 | /* is seq1 < seq2 ? */ |
a10cedd4 | 87 | static inline int before48(const u64 seq1, const u64 seq2) |
7c657876 | 88 | { |
a10cedd4 | 89 | return (s64)((seq1 << 16) - (seq2 << 16)) < 0; |
7c657876 ACM |
90 | } |
91 | ||
92 | /* is seq1 > seq2 ? */ | |
a10cedd4 | 93 | static inline int after48(const u64 seq1, const u64 seq2) |
7c657876 | 94 | { |
a10cedd4 | 95 | return (s64)((seq2 << 16) - (seq1 << 16)) < 0; |
7c657876 ACM |
96 | } |
97 | ||
98 | /* is seq2 <= seq1 <= seq3 ? */ | |
a10cedd4 | 99 | static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3) |
7c657876 ACM |
100 | { |
101 | return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16); | |
102 | } | |
103 | ||
104 | static inline u64 max48(const u64 seq1, const u64 seq2) | |
105 | { | |
106 | return after48(seq1, seq2) ? seq1 : seq2; | |
107 | } | |
108 | ||
837d107c IM |
109 | /* is seq1 next seqno after seq2 */ |
110 | static inline int follows48(const u64 seq1, const u64 seq2) | |
111 | { | |
112 | int diff = (seq1 & 0xFFFF) - (seq2 & 0xFFFF); | |
113 | ||
114 | return diff==1; | |
115 | } | |
116 | ||
7c657876 ACM |
117 | enum { |
118 | DCCP_MIB_NUM = 0, | |
119 | DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */ | |
120 | DCCP_MIB_ESTABRESETS, /* EstabResets */ | |
121 | DCCP_MIB_CURRESTAB, /* CurrEstab */ | |
122 | DCCP_MIB_OUTSEGS, /* OutSegs */ | |
123 | DCCP_MIB_OUTRSTS, | |
124 | DCCP_MIB_ABORTONTIMEOUT, | |
125 | DCCP_MIB_TIMEOUTS, | |
126 | DCCP_MIB_ABORTFAILED, | |
127 | DCCP_MIB_PASSIVEOPENS, | |
128 | DCCP_MIB_ATTEMPTFAILS, | |
129 | DCCP_MIB_OUTDATAGRAMS, | |
130 | DCCP_MIB_INERRS, | |
131 | DCCP_MIB_OPTMANDATORYERROR, | |
132 | DCCP_MIB_INVALIDOPT, | |
133 | __DCCP_MIB_MAX | |
134 | }; | |
135 | ||
136 | #define DCCP_MIB_MAX __DCCP_MIB_MAX | |
137 | struct dccp_mib { | |
138 | unsigned long mibs[DCCP_MIB_MAX]; | |
139 | } __SNMP_MIB_ALIGN__; | |
140 | ||
141 | DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics); | |
7690af3f ACM |
142 | #define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field) |
143 | #define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field) | |
144 | #define DCCP_INC_STATS_USER(field) SNMP_INC_STATS_USER(dccp_statistics, field) | |
145 | #define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field) | |
146 | #define DCCP_ADD_STATS_BH(field, val) \ | |
147 | SNMP_ADD_STATS_BH(dccp_statistics, field, val) | |
148 | #define DCCP_ADD_STATS_USER(field, val) \ | |
149 | SNMP_ADD_STATS_USER(dccp_statistics, field, val) | |
7c657876 | 150 | |
6f4e5fff GR |
151 | /* |
152 | * Checksumming routines | |
153 | */ | |
154 | static inline int dccp_csum_coverage(const struct sk_buff *skb) | |
155 | { | |
156 | const struct dccp_hdr* dh = dccp_hdr(skb); | |
157 | ||
158 | if (dh->dccph_cscov == 0) | |
159 | return skb->len; | |
160 | return (dh->dccph_doff + dh->dccph_cscov - 1) * sizeof(u32); | |
161 | } | |
162 | ||
163 | static inline void dccp_csum_outgoing(struct sk_buff *skb) | |
164 | { | |
165 | int cov = dccp_csum_coverage(skb); | |
166 | ||
167 | if (cov >= skb->len) | |
168 | dccp_hdr(skb)->dccph_cscov = 0; | |
169 | ||
170 | skb->csum = skb_checksum(skb, 0, (cov > skb->len)? skb->len : cov, 0); | |
171 | } | |
172 | ||
173 | extern void dccp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb); | |
174 | ||
7c657876 ACM |
175 | extern int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb); |
176 | ||
7c657876 ACM |
177 | extern void dccp_send_ack(struct sock *sk); |
178 | extern void dccp_send_delayed_ack(struct sock *sk); | |
8a73cd09 GR |
179 | extern void dccp_reqsk_send_ack(struct sk_buff *sk, struct request_sock *rsk); |
180 | ||
e92ae93a ACM |
181 | extern void dccp_send_sync(struct sock *sk, const u64 seq, |
182 | const enum dccp_pkt_type pkt_type); | |
7c657876 | 183 | |
97e5848d | 184 | extern void dccp_write_xmit(struct sock *sk, int block); |
c530cfb1 | 185 | extern void dccp_write_space(struct sock *sk); |
27258ee5 | 186 | |
7c657876 ACM |
187 | extern void dccp_init_xmit_timers(struct sock *sk); |
188 | static inline void dccp_clear_xmit_timers(struct sock *sk) | |
189 | { | |
190 | inet_csk_clear_xmit_timers(sk); | |
191 | } | |
192 | ||
193 | extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu); | |
194 | ||
195 | extern const char *dccp_packet_name(const int type); | |
196 | extern const char *dccp_state_name(const int state); | |
197 | ||
c25a18ba ACM |
198 | extern void dccp_set_state(struct sock *sk, const int state); |
199 | extern void dccp_done(struct sock *sk); | |
7c657876 | 200 | |
cf557926 | 201 | extern void dccp_reqsk_init(struct request_sock *req, struct sk_buff *skb); |
7c657876 | 202 | |
7c657876 ACM |
203 | extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb); |
204 | ||
205 | extern struct sock *dccp_create_openreq_child(struct sock *sk, | |
206 | const struct request_sock *req, | |
207 | const struct sk_buff *skb); | |
208 | ||
209 | extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb); | |
210 | ||
7c657876 ACM |
211 | extern struct sock *dccp_v4_request_recv_sock(struct sock *sk, |
212 | struct sk_buff *skb, | |
213 | struct request_sock *req, | |
214 | struct dst_entry *dst); | |
215 | extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb, | |
216 | struct request_sock *req, | |
217 | struct request_sock **prev); | |
218 | ||
219 | extern int dccp_child_process(struct sock *parent, struct sock *child, | |
220 | struct sk_buff *skb); | |
221 | extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb, | |
222 | struct dccp_hdr *dh, unsigned len); | |
223 | extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb, | |
224 | const struct dccp_hdr *dh, const unsigned len); | |
225 | ||
72478873 | 226 | extern int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized); |
3e0fadc5 | 227 | extern int dccp_destroy_sock(struct sock *sk); |
f21e68ca | 228 | |
7c657876 ACM |
229 | extern void dccp_close(struct sock *sk, long timeout); |
230 | extern struct sk_buff *dccp_make_response(struct sock *sk, | |
231 | struct dst_entry *dst, | |
232 | struct request_sock *req); | |
233 | ||
234 | extern int dccp_connect(struct sock *sk); | |
235 | extern int dccp_disconnect(struct sock *sk, int flags); | |
c985ed70 | 236 | extern void dccp_hash(struct sock *sk); |
f21e68ca | 237 | extern void dccp_unhash(struct sock *sk); |
7c657876 | 238 | extern int dccp_getsockopt(struct sock *sk, int level, int optname, |
a1d3a355 ACM |
239 | char __user *optval, int __user *optlen); |
240 | extern int dccp_setsockopt(struct sock *sk, int level, int optname, | |
241 | char __user *optval, int optlen); | |
3fdadf7d DM |
242 | #ifdef CONFIG_COMPAT |
243 | extern int compat_dccp_getsockopt(struct sock *sk, | |
244 | int level, int optname, | |
245 | char __user *optval, int __user *optlen); | |
246 | extern int compat_dccp_setsockopt(struct sock *sk, | |
247 | int level, int optname, | |
248 | char __user *optval, int optlen); | |
249 | #endif | |
7c657876 | 250 | extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg); |
7690af3f ACM |
251 | extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, |
252 | struct msghdr *msg, size_t size); | |
7c657876 ACM |
253 | extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, |
254 | struct msghdr *msg, size_t len, int nonblock, | |
255 | int flags, int *addr_len); | |
7c657876 | 256 | extern void dccp_shutdown(struct sock *sk, int how); |
f21e68ca ACM |
257 | extern int inet_dccp_listen(struct socket *sock, int backlog); |
258 | extern unsigned int dccp_poll(struct file *file, struct socket *sock, | |
259 | poll_table *wait); | |
f21e68ca ACM |
260 | extern int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, |
261 | int addr_len); | |
7c657876 | 262 | |
017487d7 | 263 | extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code); |
7ad07e7c | 264 | extern void dccp_send_close(struct sock *sk, const int active); |
f21e68ca ACM |
265 | extern int dccp_invalid_packet(struct sk_buff *skb); |
266 | ||
267 | static inline int dccp_bad_service_code(const struct sock *sk, | |
60fe62e7 | 268 | const __be32 service) |
f21e68ca ACM |
269 | { |
270 | const struct dccp_sock *dp = dccp_sk(sk); | |
271 | ||
272 | if (dp->dccps_service == service) | |
273 | return 0; | |
274 | return !dccp_list_has_service(dp->dccps_service_list, service); | |
275 | } | |
7c657876 ACM |
276 | |
277 | struct dccp_skb_cb { | |
67e6b629 ACM |
278 | __u8 dccpd_type:4; |
279 | __u8 dccpd_ccval:4; | |
280 | __u8 dccpd_reset_code; | |
281 | __u16 dccpd_opt_len; | |
7c657876 ACM |
282 | __u64 dccpd_seq; |
283 | __u64 dccpd_ack_seq; | |
7c657876 ACM |
284 | }; |
285 | ||
286 | #define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0])) | |
287 | ||
288 | static inline int dccp_non_data_packet(const struct sk_buff *skb) | |
289 | { | |
290 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; | |
291 | ||
292 | return type == DCCP_PKT_ACK || | |
293 | type == DCCP_PKT_CLOSE || | |
294 | type == DCCP_PKT_CLOSEREQ || | |
295 | type == DCCP_PKT_RESET || | |
296 | type == DCCP_PKT_SYNC || | |
297 | type == DCCP_PKT_SYNCACK; | |
298 | } | |
299 | ||
300 | static inline int dccp_packet_without_ack(const struct sk_buff *skb) | |
301 | { | |
302 | const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; | |
303 | ||
304 | return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST; | |
305 | } | |
306 | ||
307 | #define DCCP_MAX_SEQNO ((((u64)1) << 48) - 1) | |
308 | #define DCCP_PKT_WITHOUT_ACK_SEQ (DCCP_MAX_SEQNO << 2) | |
309 | ||
310 | static inline void dccp_set_seqno(u64 *seqno, u64 value) | |
311 | { | |
312 | if (value > DCCP_MAX_SEQNO) | |
313 | value -= DCCP_MAX_SEQNO + 1; | |
314 | *seqno = value; | |
315 | } | |
316 | ||
317 | static inline u64 dccp_delta_seqno(u64 seqno1, u64 seqno2) | |
318 | { | |
319 | return ((seqno2 << 16) - (seqno1 << 16)) >> 16; | |
320 | } | |
321 | ||
322 | static inline void dccp_inc_seqno(u64 *seqno) | |
323 | { | |
324 | if (++*seqno > DCCP_MAX_SEQNO) | |
325 | *seqno = 0; | |
326 | } | |
327 | ||
328 | static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss) | |
329 | { | |
7690af3f ACM |
330 | struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh + |
331 | sizeof(*dh)); | |
60fe62e7 AB |
332 | dh->dccph_seq2 = 0; |
333 | dh->dccph_seq = htons((gss >> 32) & 0xfffff); | |
7c657876 ACM |
334 | dhx->dccph_seq_low = htonl(gss & 0xffffffff); |
335 | } | |
336 | ||
7690af3f ACM |
337 | static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack, |
338 | const u64 gsr) | |
7c657876 | 339 | { |
60fe62e7 AB |
340 | dhack->dccph_reserved1 = 0; |
341 | dhack->dccph_ack_nr_high = htons(gsr >> 32); | |
7c657876 ACM |
342 | dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff); |
343 | } | |
344 | ||
345 | static inline void dccp_update_gsr(struct sock *sk, u64 seq) | |
346 | { | |
347 | struct dccp_sock *dp = dccp_sk(sk); | |
a4bf3902 | 348 | const struct dccp_minisock *dmsk = dccp_msk(sk); |
7c657876 | 349 | |
03ace394 ACM |
350 | dp->dccps_gsr = seq; |
351 | dccp_set_seqno(&dp->dccps_swl, | |
a4bf3902 | 352 | dp->dccps_gsr + 1 - (dmsk->dccpms_sequence_window / 4)); |
7c657876 | 353 | dccp_set_seqno(&dp->dccps_swh, |
a4bf3902 | 354 | dp->dccps_gsr + (3 * dmsk->dccpms_sequence_window) / 4); |
7c657876 ACM |
355 | } |
356 | ||
357 | static inline void dccp_update_gss(struct sock *sk, u64 seq) | |
358 | { | |
359 | struct dccp_sock *dp = dccp_sk(sk); | |
7c657876 | 360 | |
03ace394 ACM |
361 | dp->dccps_awh = dp->dccps_gss = seq; |
362 | dccp_set_seqno(&dp->dccps_awl, | |
7690af3f | 363 | (dp->dccps_gss - |
a4bf3902 | 364 | dccp_msk(sk)->dccpms_sequence_window + 1)); |
7c657876 | 365 | } |
ae31c339 ACM |
366 | |
367 | static inline int dccp_ack_pending(const struct sock *sk) | |
368 | { | |
369 | const struct dccp_sock *dp = dccp_sk(sk); | |
370 | return dp->dccps_timestamp_echo != 0 || | |
371 | #ifdef CONFIG_IP_DCCP_ACKVEC | |
a4bf3902 | 372 | (dccp_msk(sk)->dccpms_send_ack_vector && |
ae31c339 ACM |
373 | dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) || |
374 | #endif | |
375 | inet_csk_ack_scheduled(sk); | |
376 | } | |
7c657876 | 377 | |
2d0817d1 ACM |
378 | extern int dccp_insert_options(struct sock *sk, struct sk_buff *skb); |
379 | extern int dccp_insert_option_elapsed_time(struct sock *sk, | |
7c657876 ACM |
380 | struct sk_buff *skb, |
381 | u32 elapsed_time); | |
2d0817d1 | 382 | extern int dccp_insert_option_timestamp(struct sock *sk, |
d4b81ff7 | 383 | struct sk_buff *skb); |
2d0817d1 | 384 | extern int dccp_insert_option(struct sock *sk, struct sk_buff *skb, |
7c657876 ACM |
385 | unsigned char option, |
386 | const void *value, unsigned char len); | |
387 | ||
b0e56780 ACM |
388 | extern void dccp_timestamp(const struct sock *sk, struct timeval *tv); |
389 | ||
b6ee3d4a ACM |
390 | static inline suseconds_t timeval_usecs(const struct timeval *tv) |
391 | { | |
392 | return tv->tv_sec * USEC_PER_SEC + tv->tv_usec; | |
393 | } | |
394 | ||
395 | static inline suseconds_t timeval_delta(const struct timeval *large, | |
396 | const struct timeval *small) | |
397 | { | |
398 | time_t secs = large->tv_sec - small->tv_sec; | |
399 | suseconds_t usecs = large->tv_usec - small->tv_usec; | |
400 | ||
401 | if (usecs < 0) { | |
402 | secs--; | |
403 | usecs += USEC_PER_SEC; | |
404 | } | |
405 | return secs * USEC_PER_SEC + usecs; | |
406 | } | |
407 | ||
408 | static inline void timeval_add_usecs(struct timeval *tv, | |
409 | const suseconds_t usecs) | |
410 | { | |
411 | tv->tv_usec += usecs; | |
412 | while (tv->tv_usec >= USEC_PER_SEC) { | |
413 | tv->tv_sec++; | |
414 | tv->tv_usec -= USEC_PER_SEC; | |
415 | } | |
416 | } | |
417 | ||
418 | static inline void timeval_sub_usecs(struct timeval *tv, | |
419 | const suseconds_t usecs) | |
420 | { | |
421 | tv->tv_usec -= usecs; | |
422 | while (tv->tv_usec < 0) { | |
423 | tv->tv_sec--; | |
424 | tv->tv_usec += USEC_PER_SEC; | |
425 | } | |
426 | } | |
427 | ||
e55d912f ACM |
428 | #ifdef CONFIG_SYSCTL |
429 | extern int dccp_sysctl_init(void); | |
430 | extern void dccp_sysctl_exit(void); | |
431 | #else | |
432 | static inline int dccp_sysctl_init(void) | |
433 | { | |
434 | return 0; | |
435 | } | |
436 | ||
437 | static inline void dccp_sysctl_exit(void) | |
438 | { | |
439 | } | |
440 | #endif | |
441 | ||
7c657876 | 442 | #endif /* _DCCP_H */ |