1 #ifndef _DCCP_H 2 #define _DCCP_H 3 /* 4 * net/dccp/dccp.h 5 * 6 * An implementation of the DCCP protocol 7 * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br> 8 * Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.nz> 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> 19 #include "ackvec.h" 20 21 #ifdef CONFIG_IP_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) \ 29 printk(format, ##a); } while (0) 30 #else 31 #define dccp_pr_debug(format, a...) 32 #define dccp_pr_debug_cat(format, a...) 33 #endif 34 35 extern struct inet_hashinfo dccp_hashinfo; 36 37 extern atomic_t dccp_orphan_count; 38 extern int dccp_tw_count; 39 extern void dccp_tw_deschedule(struct inet_timewait_sock *tw); 40 41 extern void dccp_time_wait(struct sock *sk, int state, int timeo); 42 43 /* FIXME: Right size this */ 44 #define DCCP_MAX_OPT_LEN 128 45 46 #define DCCP_MAX_PACKET_HDR 32 47 48 #define MAX_DCCP_HEADER (DCCP_MAX_PACKET_HDR + DCCP_MAX_OPT_LEN + MAX_HEADER) 49 50 #define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT 51 * state, about 60 seconds */ 52 53 /* draft-ietf-dccp-spec-11.txt initial RTO value */ 54 #define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ)) 55 56 /* Maximal interval between probes for local resources. */ 57 #define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U)) 58 59 #define DCCP_RTO_MAX ((unsigned)(120 * HZ)) /* FIXME: using TCP value */ 60 61 /* is seq1 < seq2 ? */ 62 static inline int before48(const u64 seq1, const u64 seq2) 63 { 64 return (s64)((seq1 << 16) - (seq2 << 16)) < 0; 65 } 66 67 /* is seq1 > seq2 ? */ 68 static inline int after48(const u64 seq1, const u64 seq2) 69 { 70 return (s64)((seq2 << 16) - (seq1 << 16)) < 0; 71 } 72 73 /* is seq2 <= seq1 <= seq3 ? */ 74 static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3) 75 { 76 return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16); 77 } 78 79 static inline u64 max48(const u64 seq1, const u64 seq2) 80 { 81 return after48(seq1, seq2) ? seq1 : seq2; 82 } 83 84 /* is seq1 next seqno after seq2 */ 85 static inline int follows48(const u64 seq1, const u64 seq2) 86 { 87 int diff = (seq1 & 0xFFFF) - (seq2 & 0xFFFF); 88 89 return diff==1; 90 } 91 92 enum { 93 DCCP_MIB_NUM = 0, 94 DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */ 95 DCCP_MIB_ESTABRESETS, /* EstabResets */ 96 DCCP_MIB_CURRESTAB, /* CurrEstab */ 97 DCCP_MIB_OUTSEGS, /* OutSegs */ 98 DCCP_MIB_OUTRSTS, 99 DCCP_MIB_ABORTONTIMEOUT, 100 DCCP_MIB_TIMEOUTS, 101 DCCP_MIB_ABORTFAILED, 102 DCCP_MIB_PASSIVEOPENS, 103 DCCP_MIB_ATTEMPTFAILS, 104 DCCP_MIB_OUTDATAGRAMS, 105 DCCP_MIB_INERRS, 106 DCCP_MIB_OPTMANDATORYERROR, 107 DCCP_MIB_INVALIDOPT, 108 __DCCP_MIB_MAX 109 }; 110 111 #define DCCP_MIB_MAX __DCCP_MIB_MAX 112 struct dccp_mib { 113 unsigned long mibs[DCCP_MIB_MAX]; 114 } __SNMP_MIB_ALIGN__; 115 116 DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics); 117 #define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field) 118 #define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field) 119 #define DCCP_INC_STATS_USER(field) SNMP_INC_STATS_USER(dccp_statistics, field) 120 #define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field) 121 #define DCCP_ADD_STATS_BH(field, val) \ 122 SNMP_ADD_STATS_BH(dccp_statistics, field, val) 123 #define DCCP_ADD_STATS_USER(field, val) \ 124 SNMP_ADD_STATS_USER(dccp_statistics, field, val) 125 126 extern int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb); 127 128 extern void dccp_send_ack(struct sock *sk); 129 extern void dccp_send_delayed_ack(struct sock *sk); 130 extern void dccp_send_sync(struct sock *sk, const u64 seq, 131 const enum dccp_pkt_type pkt_type); 132 133 extern int dccp_write_xmit(struct sock *sk, struct sk_buff *skb, long *timeo); 134 extern void dccp_write_space(struct sock *sk); 135 136 extern void dccp_init_xmit_timers(struct sock *sk); 137 static inline void dccp_clear_xmit_timers(struct sock *sk) 138 { 139 inet_csk_clear_xmit_timers(sk); 140 } 141 142 extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu); 143 144 extern const char *dccp_packet_name(const int type); 145 extern const char *dccp_state_name(const int state); 146 147 extern void dccp_set_state(struct sock *sk, const int state); 148 extern void dccp_done(struct sock *sk); 149 150 static inline void dccp_openreq_init(struct request_sock *req, 151 struct dccp_sock *dp, 152 struct sk_buff *skb) 153 { 154 /* 155 * FIXME: fill in the other req fields from the DCCP options 156 * received 157 */ 158 inet_rsk(req)->rmt_port = dccp_hdr(skb)->dccph_sport; 159 inet_rsk(req)->acked = 0; 160 req->rcv_wnd = 0; 161 } 162 163 extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb); 164 165 extern struct sock *dccp_create_openreq_child(struct sock *sk, 166 const struct request_sock *req, 167 const struct sk_buff *skb); 168 169 extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb); 170 171 extern struct sock *dccp_v4_request_recv_sock(struct sock *sk, 172 struct sk_buff *skb, 173 struct request_sock *req, 174 struct dst_entry *dst); 175 extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb, 176 struct request_sock *req, 177 struct request_sock **prev); 178 179 extern int dccp_child_process(struct sock *parent, struct sock *child, 180 struct sk_buff *skb); 181 extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb, 182 struct dccp_hdr *dh, unsigned len); 183 extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb, 184 const struct dccp_hdr *dh, const unsigned len); 185 186 extern int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized); 187 extern int dccp_destroy_sock(struct sock *sk); 188 189 extern void dccp_close(struct sock *sk, long timeout); 190 extern struct sk_buff *dccp_make_response(struct sock *sk, 191 struct dst_entry *dst, 192 struct request_sock *req); 193 194 extern int dccp_connect(struct sock *sk); 195 extern int dccp_disconnect(struct sock *sk, int flags); 196 extern void dccp_hash(struct sock *sk); 197 extern void dccp_unhash(struct sock *sk); 198 extern int dccp_getsockopt(struct sock *sk, int level, int optname, 199 char __user *optval, int __user *optlen); 200 extern int dccp_setsockopt(struct sock *sk, int level, int optname, 201 char __user *optval, int optlen); 202 #ifdef CONFIG_COMPAT 203 extern int compat_dccp_getsockopt(struct sock *sk, 204 int level, int optname, 205 char __user *optval, int __user *optlen); 206 extern int compat_dccp_setsockopt(struct sock *sk, 207 int level, int optname, 208 char __user *optval, int optlen); 209 #endif 210 extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg); 211 extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, 212 struct msghdr *msg, size_t size); 213 extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, 214 struct msghdr *msg, size_t len, int nonblock, 215 int flags, int *addr_len); 216 extern void dccp_shutdown(struct sock *sk, int how); 217 extern int inet_dccp_listen(struct socket *sock, int backlog); 218 extern unsigned int dccp_poll(struct file *file, struct socket *sock, 219 poll_table *wait); 220 extern void dccp_v4_send_check(struct sock *sk, int len, 221 struct sk_buff *skb); 222 extern int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, 223 int addr_len); 224 225 extern int dccp_v4_checksum(const struct sk_buff *skb, 226 const __be32 saddr, const __be32 daddr); 227 228 extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code); 229 extern void dccp_send_close(struct sock *sk, const int active); 230 extern int dccp_invalid_packet(struct sk_buff *skb); 231 232 static inline int dccp_bad_service_code(const struct sock *sk, 233 const __be32 service) 234 { 235 const struct dccp_sock *dp = dccp_sk(sk); 236 237 if (dp->dccps_service == service) 238 return 0; 239 return !dccp_list_has_service(dp->dccps_service_list, service); 240 } 241 242 struct dccp_skb_cb { 243 __u8 dccpd_type:4; 244 __u8 dccpd_ccval:4; 245 __u8 dccpd_reset_code; 246 __u16 dccpd_opt_len; 247 __u64 dccpd_seq; 248 __u64 dccpd_ack_seq; 249 }; 250 251 #define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0])) 252 253 static inline int dccp_non_data_packet(const struct sk_buff *skb) 254 { 255 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; 256 257 return type == DCCP_PKT_ACK || 258 type == DCCP_PKT_CLOSE || 259 type == DCCP_PKT_CLOSEREQ || 260 type == DCCP_PKT_RESET || 261 type == DCCP_PKT_SYNC || 262 type == DCCP_PKT_SYNCACK; 263 } 264 265 static inline int dccp_packet_without_ack(const struct sk_buff *skb) 266 { 267 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; 268 269 return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST; 270 } 271 272 #define DCCP_MAX_SEQNO ((((u64)1) << 48) - 1) 273 #define DCCP_PKT_WITHOUT_ACK_SEQ (DCCP_MAX_SEQNO << 2) 274 275 static inline void dccp_set_seqno(u64 *seqno, u64 value) 276 { 277 if (value > DCCP_MAX_SEQNO) 278 value -= DCCP_MAX_SEQNO + 1; 279 *seqno = value; 280 } 281 282 static inline u64 dccp_delta_seqno(u64 seqno1, u64 seqno2) 283 { 284 return ((seqno2 << 16) - (seqno1 << 16)) >> 16; 285 } 286 287 static inline void dccp_inc_seqno(u64 *seqno) 288 { 289 if (++*seqno > DCCP_MAX_SEQNO) 290 *seqno = 0; 291 } 292 293 static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss) 294 { 295 struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh + 296 sizeof(*dh)); 297 dh->dccph_seq2 = 0; 298 dh->dccph_seq = htons((gss >> 32) & 0xfffff); 299 dhx->dccph_seq_low = htonl(gss & 0xffffffff); 300 } 301 302 static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack, 303 const u64 gsr) 304 { 305 dhack->dccph_reserved1 = 0; 306 dhack->dccph_ack_nr_high = htons(gsr >> 32); 307 dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff); 308 } 309 310 static inline void dccp_update_gsr(struct sock *sk, u64 seq) 311 { 312 struct dccp_sock *dp = dccp_sk(sk); 313 const struct dccp_minisock *dmsk = dccp_msk(sk); 314 315 dp->dccps_gsr = seq; 316 dccp_set_seqno(&dp->dccps_swl, 317 dp->dccps_gsr + 1 - (dmsk->dccpms_sequence_window / 4)); 318 dccp_set_seqno(&dp->dccps_swh, 319 dp->dccps_gsr + (3 * dmsk->dccpms_sequence_window) / 4); 320 } 321 322 static inline void dccp_update_gss(struct sock *sk, u64 seq) 323 { 324 struct dccp_sock *dp = dccp_sk(sk); 325 326 dp->dccps_awh = dp->dccps_gss = seq; 327 dccp_set_seqno(&dp->dccps_awl, 328 (dp->dccps_gss - 329 dccp_msk(sk)->dccpms_sequence_window + 1)); 330 } 331 332 static inline int dccp_ack_pending(const struct sock *sk) 333 { 334 const struct dccp_sock *dp = dccp_sk(sk); 335 return dp->dccps_timestamp_echo != 0 || 336 #ifdef CONFIG_IP_DCCP_ACKVEC 337 (dccp_msk(sk)->dccpms_send_ack_vector && 338 dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) || 339 #endif 340 inet_csk_ack_scheduled(sk); 341 } 342 343 extern int dccp_insert_options(struct sock *sk, struct sk_buff *skb); 344 extern int dccp_insert_option_elapsed_time(struct sock *sk, 345 struct sk_buff *skb, 346 u32 elapsed_time); 347 extern int dccp_insert_option_timestamp(struct sock *sk, 348 struct sk_buff *skb); 349 extern int dccp_insert_option(struct sock *sk, struct sk_buff *skb, 350 unsigned char option, 351 const void *value, unsigned char len); 352 353 extern void dccp_timestamp(const struct sock *sk, struct timeval *tv); 354 355 static inline suseconds_t timeval_usecs(const struct timeval *tv) 356 { 357 return tv->tv_sec * USEC_PER_SEC + tv->tv_usec; 358 } 359 360 static inline suseconds_t timeval_delta(const struct timeval *large, 361 const struct timeval *small) 362 { 363 time_t secs = large->tv_sec - small->tv_sec; 364 suseconds_t usecs = large->tv_usec - small->tv_usec; 365 366 if (usecs < 0) { 367 secs--; 368 usecs += USEC_PER_SEC; 369 } 370 return secs * USEC_PER_SEC + usecs; 371 } 372 373 static inline void timeval_add_usecs(struct timeval *tv, 374 const suseconds_t usecs) 375 { 376 tv->tv_usec += usecs; 377 while (tv->tv_usec >= USEC_PER_SEC) { 378 tv->tv_sec++; 379 tv->tv_usec -= USEC_PER_SEC; 380 } 381 } 382 383 static inline void timeval_sub_usecs(struct timeval *tv, 384 const suseconds_t usecs) 385 { 386 tv->tv_usec -= usecs; 387 while (tv->tv_usec < 0) { 388 tv->tv_sec--; 389 tv->tv_usec += USEC_PER_SEC; 390 } 391 } 392 393 #ifdef CONFIG_SYSCTL 394 extern int dccp_sysctl_init(void); 395 extern void dccp_sysctl_exit(void); 396 #else 397 static inline int dccp_sysctl_init(void) 398 { 399 return 0; 400 } 401 402 static inline void dccp_sysctl_exit(void) 403 { 404 } 405 #endif 406 407 #endif /* _DCCP_H */ 408