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 Ian McDonald <iam4@cs.waikato.ac.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/config.h> 16 #include <linux/dccp.h> 17 #include <net/snmp.h> 18 #include <net/sock.h> 19 #include <net/tcp.h> 20 #include "ackvec.h" 21 22 #ifdef CONFIG_IP_DCCP_DEBUG 23 extern int dccp_debug; 24 25 #define dccp_pr_debug(format, a...) \ 26 do { if (dccp_debug) \ 27 printk(KERN_DEBUG "%s: " format, __FUNCTION__ , ##a); \ 28 } while (0) 29 #define dccp_pr_debug_cat(format, a...) do { if (dccp_debug) \ 30 printk(format, ##a); } while (0) 31 #else 32 #define dccp_pr_debug(format, a...) 33 #define dccp_pr_debug_cat(format, a...) 34 #endif 35 36 extern struct inet_hashinfo dccp_hashinfo; 37 38 extern atomic_t dccp_orphan_count; 39 extern int dccp_tw_count; 40 extern void dccp_tw_deschedule(struct inet_timewait_sock *tw); 41 42 extern void dccp_time_wait(struct sock *sk, int state, int timeo); 43 44 /* FIXME: Right size this */ 45 #define DCCP_MAX_OPT_LEN 128 46 47 #define DCCP_MAX_PACKET_HDR 32 48 49 #define MAX_DCCP_HEADER (DCCP_MAX_PACKET_HDR + DCCP_MAX_OPT_LEN + MAX_HEADER) 50 51 #define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT 52 * state, about 60 seconds */ 53 54 /* draft-ietf-dccp-spec-11.txt initial RTO value */ 55 #define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ)) 56 57 /* Maximal interval between probes for local resources. */ 58 #define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U)) 59 60 #define DCCP_RTO_MAX ((unsigned)(120 * HZ)) /* FIXME: using TCP value */ 61 62 /* is seq1 < seq2 ? */ 63 static inline int before48(const u64 seq1, const u64 seq2) 64 { 65 return (s64)((seq1 << 16) - (seq2 << 16)) < 0; 66 } 67 68 /* is seq1 > seq2 ? */ 69 static inline int after48(const u64 seq1, const u64 seq2) 70 { 71 return (s64)((seq2 << 16) - (seq1 << 16)) < 0; 72 } 73 74 /* is seq2 <= seq1 <= seq3 ? */ 75 static inline 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) \ 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) 118 119 extern int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb); 120 121 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, const u64 seq, 124 const enum dccp_pkt_type pkt_type); 125 126 extern int dccp_write_xmit(struct sock *sk, struct sk_buff *skb, long *timeo); 127 extern void dccp_write_space(struct sock *sk); 128 129 extern void dccp_init_xmit_timers(struct sock *sk); 130 static inline void dccp_clear_xmit_timers(struct sock *sk) 131 { 132 inet_csk_clear_xmit_timers(sk); 133 } 134 135 extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu); 136 137 extern const char *dccp_packet_name(const int type); 138 extern const char *dccp_state_name(const int state); 139 140 extern void dccp_set_state(struct sock *sk, const int state); 141 extern void dccp_done(struct sock *sk); 142 143 static inline void dccp_openreq_init(struct request_sock *req, 144 struct dccp_sock *dp, 145 struct sk_buff *skb) 146 { 147 /* 148 * FIXME: fill in the other req fields from the DCCP options 149 * received 150 */ 151 inet_rsk(req)->rmt_port = dccp_hdr(skb)->dccph_sport; 152 inet_rsk(req)->acked = 0; 153 req->rcv_wnd = 0; 154 } 155 156 extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb); 157 158 extern struct sock *dccp_create_openreq_child(struct sock *sk, 159 const struct request_sock *req, 160 const struct sk_buff *skb); 161 162 extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb); 163 164 extern struct sock *dccp_v4_request_recv_sock(struct sock *sk, 165 struct sk_buff *skb, 166 struct request_sock *req, 167 struct dst_entry *dst); 168 extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb, 169 struct request_sock *req, 170 struct request_sock **prev); 171 172 extern int dccp_child_process(struct sock *parent, struct sock *child, 173 struct sk_buff *skb); 174 extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb, 175 struct dccp_hdr *dh, unsigned len); 176 extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb, 177 const struct dccp_hdr *dh, const unsigned len); 178 179 extern int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized); 180 extern int dccp_destroy_sock(struct sock *sk); 181 182 extern void dccp_close(struct sock *sk, long timeout); 183 extern struct sk_buff *dccp_make_response(struct sock *sk, 184 struct dst_entry *dst, 185 struct request_sock *req); 186 187 extern int dccp_connect(struct sock *sk); 188 extern int dccp_disconnect(struct sock *sk, int flags); 189 extern void dccp_hash(struct sock *sk); 190 extern void dccp_unhash(struct sock *sk); 191 extern int dccp_getsockopt(struct sock *sk, int level, int optname, 192 char __user *optval, int __user *optlen); 193 extern int dccp_setsockopt(struct sock *sk, int level, int optname, 194 char __user *optval, int optlen); 195 #ifdef CONFIG_COMPAT 196 extern int compat_dccp_getsockopt(struct sock *sk, 197 int level, int optname, 198 char __user *optval, int __user *optlen); 199 extern int compat_dccp_setsockopt(struct sock *sk, 200 int level, int optname, 201 char __user *optval, int optlen); 202 #endif 203 extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg); 204 extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, 205 struct msghdr *msg, size_t size); 206 extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, 207 struct msghdr *msg, size_t len, int nonblock, 208 int flags, int *addr_len); 209 extern void dccp_shutdown(struct sock *sk, int how); 210 extern int inet_dccp_listen(struct socket *sock, int backlog); 211 extern unsigned int dccp_poll(struct file *file, struct socket *sock, 212 poll_table *wait); 213 extern void dccp_v4_send_check(struct sock *sk, int len, 214 struct sk_buff *skb); 215 extern int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, 216 int addr_len); 217 218 extern int dccp_v4_checksum(const struct sk_buff *skb, 219 const __be32 saddr, const __be32 daddr); 220 221 extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code); 222 extern void dccp_send_close(struct sock *sk, const int active); 223 extern int dccp_invalid_packet(struct sk_buff *skb); 224 225 static inline int dccp_bad_service_code(const struct sock *sk, 226 const __be32 service) 227 { 228 const struct dccp_sock *dp = dccp_sk(sk); 229 230 if (dp->dccps_service == service) 231 return 0; 232 return !dccp_list_has_service(dp->dccps_service_list, service); 233 } 234 235 struct dccp_skb_cb { 236 __u8 dccpd_type:4; 237 __u8 dccpd_ccval:4; 238 __u8 dccpd_reset_code; 239 __u16 dccpd_opt_len; 240 __u64 dccpd_seq; 241 __u64 dccpd_ack_seq; 242 }; 243 244 #define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0])) 245 246 static inline int dccp_non_data_packet(const struct sk_buff *skb) 247 { 248 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; 249 250 return type == DCCP_PKT_ACK || 251 type == DCCP_PKT_CLOSE || 252 type == DCCP_PKT_CLOSEREQ || 253 type == DCCP_PKT_RESET || 254 type == DCCP_PKT_SYNC || 255 type == DCCP_PKT_SYNCACK; 256 } 257 258 static inline int dccp_packet_without_ack(const struct sk_buff *skb) 259 { 260 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; 261 262 return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST; 263 } 264 265 #define DCCP_MAX_SEQNO ((((u64)1) << 48) - 1) 266 #define DCCP_PKT_WITHOUT_ACK_SEQ (DCCP_MAX_SEQNO << 2) 267 268 static inline void dccp_set_seqno(u64 *seqno, u64 value) 269 { 270 if (value > DCCP_MAX_SEQNO) 271 value -= DCCP_MAX_SEQNO + 1; 272 *seqno = value; 273 } 274 275 static inline u64 dccp_delta_seqno(u64 seqno1, u64 seqno2) 276 { 277 return ((seqno2 << 16) - (seqno1 << 16)) >> 16; 278 } 279 280 static inline void dccp_inc_seqno(u64 *seqno) 281 { 282 if (++*seqno > DCCP_MAX_SEQNO) 283 *seqno = 0; 284 } 285 286 static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss) 287 { 288 struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh + 289 sizeof(*dh)); 290 dh->dccph_seq2 = 0; 291 dh->dccph_seq = htons((gss >> 32) & 0xfffff); 292 dhx->dccph_seq_low = htonl(gss & 0xffffffff); 293 } 294 295 static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack, 296 const u64 gsr) 297 { 298 dhack->dccph_reserved1 = 0; 299 dhack->dccph_ack_nr_high = htons(gsr >> 32); 300 dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff); 301 } 302 303 static inline void dccp_update_gsr(struct sock *sk, u64 seq) 304 { 305 struct dccp_sock *dp = dccp_sk(sk); 306 const struct dccp_minisock *dmsk = dccp_msk(sk); 307 308 dp->dccps_gsr = seq; 309 dccp_set_seqno(&dp->dccps_swl, 310 dp->dccps_gsr + 1 - (dmsk->dccpms_sequence_window / 4)); 311 dccp_set_seqno(&dp->dccps_swh, 312 dp->dccps_gsr + (3 * dmsk->dccpms_sequence_window) / 4); 313 } 314 315 static inline void dccp_update_gss(struct sock *sk, u64 seq) 316 { 317 struct dccp_sock *dp = dccp_sk(sk); 318 319 dp->dccps_awh = dp->dccps_gss = seq; 320 dccp_set_seqno(&dp->dccps_awl, 321 (dp->dccps_gss - 322 dccp_msk(sk)->dccpms_sequence_window + 1)); 323 } 324 325 static inline int dccp_ack_pending(const struct sock *sk) 326 { 327 const struct dccp_sock *dp = dccp_sk(sk); 328 return dp->dccps_timestamp_echo != 0 || 329 #ifdef CONFIG_IP_DCCP_ACKVEC 330 (dccp_msk(sk)->dccpms_send_ack_vector && 331 dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) || 332 #endif 333 inet_csk_ack_scheduled(sk); 334 } 335 336 extern int dccp_insert_options(struct sock *sk, struct sk_buff *skb); 337 extern int dccp_insert_option_elapsed_time(struct sock *sk, 338 struct sk_buff *skb, 339 u32 elapsed_time); 340 extern int dccp_insert_option_timestamp(struct sock *sk, 341 struct sk_buff *skb); 342 extern int dccp_insert_option(struct sock *sk, struct sk_buff *skb, 343 unsigned char option, 344 const void *value, unsigned char len); 345 346 extern void dccp_timestamp(const struct sock *sk, struct timeval *tv); 347 348 static inline suseconds_t timeval_usecs(const struct timeval *tv) 349 { 350 return tv->tv_sec * USEC_PER_SEC + tv->tv_usec; 351 } 352 353 static inline suseconds_t timeval_delta(const struct timeval *large, 354 const struct timeval *small) 355 { 356 time_t secs = large->tv_sec - small->tv_sec; 357 suseconds_t usecs = large->tv_usec - small->tv_usec; 358 359 if (usecs < 0) { 360 secs--; 361 usecs += USEC_PER_SEC; 362 } 363 return secs * USEC_PER_SEC + usecs; 364 } 365 366 static inline void timeval_add_usecs(struct timeval *tv, 367 const suseconds_t usecs) 368 { 369 tv->tv_usec += usecs; 370 while (tv->tv_usec >= USEC_PER_SEC) { 371 tv->tv_sec++; 372 tv->tv_usec -= USEC_PER_SEC; 373 } 374 } 375 376 static inline void timeval_sub_usecs(struct timeval *tv, 377 const suseconds_t usecs) 378 { 379 tv->tv_usec -= usecs; 380 while (tv->tv_usec < 0) { 381 tv->tv_sec--; 382 tv->tv_usec += USEC_PER_SEC; 383 } 384 } 385 386 #ifdef CONFIG_SYSCTL 387 extern int dccp_sysctl_init(void); 388 extern void dccp_sysctl_exit(void); 389 #else 390 static inline int dccp_sysctl_init(void) 391 { 392 return 0; 393 } 394 395 static inline void dccp_sysctl_exit(void) 396 { 397 } 398 #endif 399 400 #endif /* _DCCP_H */ 401