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/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 enum { 85 DCCP_MIB_NUM = 0, 86 DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */ 87 DCCP_MIB_ESTABRESETS, /* EstabResets */ 88 DCCP_MIB_CURRESTAB, /* CurrEstab */ 89 DCCP_MIB_OUTSEGS, /* OutSegs */ 90 DCCP_MIB_OUTRSTS, 91 DCCP_MIB_ABORTONTIMEOUT, 92 DCCP_MIB_TIMEOUTS, 93 DCCP_MIB_ABORTFAILED, 94 DCCP_MIB_PASSIVEOPENS, 95 DCCP_MIB_ATTEMPTFAILS, 96 DCCP_MIB_OUTDATAGRAMS, 97 DCCP_MIB_INERRS, 98 DCCP_MIB_OPTMANDATORYERROR, 99 DCCP_MIB_INVALIDOPT, 100 __DCCP_MIB_MAX 101 }; 102 103 #define DCCP_MIB_MAX __DCCP_MIB_MAX 104 struct dccp_mib { 105 unsigned long mibs[DCCP_MIB_MAX]; 106 } __SNMP_MIB_ALIGN__; 107 108 DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics); 109 #define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field) 110 #define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field) 111 #define DCCP_INC_STATS_USER(field) SNMP_INC_STATS_USER(dccp_statistics, field) 112 #define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field) 113 #define DCCP_ADD_STATS_BH(field, val) \ 114 SNMP_ADD_STATS_BH(dccp_statistics, field, val) 115 #define DCCP_ADD_STATS_USER(field, val) \ 116 SNMP_ADD_STATS_USER(dccp_statistics, field, val) 117 118 extern int dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb); 119 120 extern void dccp_send_ack(struct sock *sk); 121 extern void dccp_send_delayed_ack(struct sock *sk); 122 extern void dccp_send_sync(struct sock *sk, const u64 seq, 123 const enum dccp_pkt_type pkt_type); 124 125 extern int dccp_write_xmit(struct sock *sk, struct sk_buff *skb, long *timeo); 126 extern void dccp_write_space(struct sock *sk); 127 128 extern void dccp_init_xmit_timers(struct sock *sk); 129 static inline void dccp_clear_xmit_timers(struct sock *sk) 130 { 131 inet_csk_clear_xmit_timers(sk); 132 } 133 134 extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu); 135 136 extern const char *dccp_packet_name(const int type); 137 extern const char *dccp_state_name(const int state); 138 139 extern void dccp_set_state(struct sock *sk, const int state); 140 extern void dccp_done(struct sock *sk); 141 142 static inline void dccp_openreq_init(struct request_sock *req, 143 struct dccp_sock *dp, 144 struct sk_buff *skb) 145 { 146 /* 147 * FIXME: fill in the other req fields from the DCCP options 148 * received 149 */ 150 inet_rsk(req)->rmt_port = dccp_hdr(skb)->dccph_sport; 151 inet_rsk(req)->acked = 0; 152 req->rcv_wnd = 0; 153 } 154 155 extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb); 156 157 extern struct sock *dccp_create_openreq_child(struct sock *sk, 158 const struct request_sock *req, 159 const struct sk_buff *skb); 160 161 extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb); 162 163 extern struct sock *dccp_v4_request_recv_sock(struct sock *sk, 164 struct sk_buff *skb, 165 struct request_sock *req, 166 struct dst_entry *dst); 167 extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb, 168 struct request_sock *req, 169 struct request_sock **prev); 170 171 extern int dccp_child_process(struct sock *parent, struct sock *child, 172 struct sk_buff *skb); 173 extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb, 174 struct dccp_hdr *dh, unsigned len); 175 extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb, 176 const struct dccp_hdr *dh, const unsigned len); 177 178 extern int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized); 179 extern int dccp_destroy_sock(struct sock *sk); 180 181 extern void dccp_close(struct sock *sk, long timeout); 182 extern struct sk_buff *dccp_make_response(struct sock *sk, 183 struct dst_entry *dst, 184 struct request_sock *req); 185 186 extern int dccp_connect(struct sock *sk); 187 extern int dccp_disconnect(struct sock *sk, int flags); 188 extern void dccp_hash(struct sock *sk); 189 extern void dccp_unhash(struct sock *sk); 190 extern int dccp_getsockopt(struct sock *sk, int level, int optname, 191 char __user *optval, int __user *optlen); 192 extern int dccp_setsockopt(struct sock *sk, int level, int optname, 193 char __user *optval, int optlen); 194 #ifdef CONFIG_COMPAT 195 extern int compat_dccp_getsockopt(struct sock *sk, 196 int level, int optname, 197 char __user *optval, int __user *optlen); 198 extern int compat_dccp_setsockopt(struct sock *sk, 199 int level, int optname, 200 char __user *optval, int optlen); 201 #endif 202 extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg); 203 extern int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, 204 struct msghdr *msg, size_t size); 205 extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, 206 struct msghdr *msg, size_t len, int nonblock, 207 int flags, int *addr_len); 208 extern void dccp_shutdown(struct sock *sk, int how); 209 extern int inet_dccp_listen(struct socket *sock, int backlog); 210 extern unsigned int dccp_poll(struct file *file, struct socket *sock, 211 poll_table *wait); 212 extern void dccp_v4_send_check(struct sock *sk, int len, 213 struct sk_buff *skb); 214 extern int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, 215 int addr_len); 216 217 extern int dccp_v4_checksum(const struct sk_buff *skb, 218 const __be32 saddr, const __be32 daddr); 219 220 extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code); 221 extern void dccp_send_close(struct sock *sk, const int active); 222 extern int dccp_invalid_packet(struct sk_buff *skb); 223 224 static inline int dccp_bad_service_code(const struct sock *sk, 225 const __be32 service) 226 { 227 const struct dccp_sock *dp = dccp_sk(sk); 228 229 if (dp->dccps_service == service) 230 return 0; 231 return !dccp_list_has_service(dp->dccps_service_list, service); 232 } 233 234 struct dccp_skb_cb { 235 __u8 dccpd_type:4; 236 __u8 dccpd_ccval:4; 237 __u8 dccpd_reset_code; 238 __u16 dccpd_opt_len; 239 __u64 dccpd_seq; 240 __u64 dccpd_ack_seq; 241 }; 242 243 #define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0])) 244 245 static inline int dccp_non_data_packet(const struct sk_buff *skb) 246 { 247 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; 248 249 return type == DCCP_PKT_ACK || 250 type == DCCP_PKT_CLOSE || 251 type == DCCP_PKT_CLOSEREQ || 252 type == DCCP_PKT_RESET || 253 type == DCCP_PKT_SYNC || 254 type == DCCP_PKT_SYNCACK; 255 } 256 257 static inline int dccp_packet_without_ack(const struct sk_buff *skb) 258 { 259 const __u8 type = DCCP_SKB_CB(skb)->dccpd_type; 260 261 return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST; 262 } 263 264 #define DCCP_MAX_SEQNO ((((u64)1) << 48) - 1) 265 #define DCCP_PKT_WITHOUT_ACK_SEQ (DCCP_MAX_SEQNO << 2) 266 267 static inline void dccp_set_seqno(u64 *seqno, u64 value) 268 { 269 if (value > DCCP_MAX_SEQNO) 270 value -= DCCP_MAX_SEQNO + 1; 271 *seqno = value; 272 } 273 274 static inline u64 dccp_delta_seqno(u64 seqno1, u64 seqno2) 275 { 276 return ((seqno2 << 16) - (seqno1 << 16)) >> 16; 277 } 278 279 static inline void dccp_inc_seqno(u64 *seqno) 280 { 281 if (++*seqno > DCCP_MAX_SEQNO) 282 *seqno = 0; 283 } 284 285 static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss) 286 { 287 struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh + 288 sizeof(*dh)); 289 dh->dccph_seq2 = 0; 290 dh->dccph_seq = htons((gss >> 32) & 0xfffff); 291 dhx->dccph_seq_low = htonl(gss & 0xffffffff); 292 } 293 294 static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack, 295 const u64 gsr) 296 { 297 dhack->dccph_reserved1 = 0; 298 dhack->dccph_ack_nr_high = htons(gsr >> 32); 299 dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff); 300 } 301 302 static inline void dccp_update_gsr(struct sock *sk, u64 seq) 303 { 304 struct dccp_sock *dp = dccp_sk(sk); 305 const struct dccp_minisock *dmsk = dccp_msk(sk); 306 307 dp->dccps_gsr = seq; 308 dccp_set_seqno(&dp->dccps_swl, 309 dp->dccps_gsr + 1 - (dmsk->dccpms_sequence_window / 4)); 310 dccp_set_seqno(&dp->dccps_swh, 311 dp->dccps_gsr + (3 * dmsk->dccpms_sequence_window) / 4); 312 } 313 314 static inline void dccp_update_gss(struct sock *sk, u64 seq) 315 { 316 struct dccp_sock *dp = dccp_sk(sk); 317 318 dp->dccps_awh = dp->dccps_gss = seq; 319 dccp_set_seqno(&dp->dccps_awl, 320 (dp->dccps_gss - 321 dccp_msk(sk)->dccpms_sequence_window + 1)); 322 } 323 324 static inline int dccp_ack_pending(const struct sock *sk) 325 { 326 const struct dccp_sock *dp = dccp_sk(sk); 327 return dp->dccps_timestamp_echo != 0 || 328 #ifdef CONFIG_IP_DCCP_ACKVEC 329 (dccp_msk(sk)->dccpms_send_ack_vector && 330 dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) || 331 #endif 332 inet_csk_ack_scheduled(sk); 333 } 334 335 extern int dccp_insert_options(struct sock *sk, struct sk_buff *skb); 336 extern int dccp_insert_option_elapsed_time(struct sock *sk, 337 struct sk_buff *skb, 338 u32 elapsed_time); 339 extern int dccp_insert_option_timestamp(struct sock *sk, 340 struct sk_buff *skb); 341 extern int dccp_insert_option(struct sock *sk, struct sk_buff *skb, 342 unsigned char option, 343 const void *value, unsigned char len); 344 345 extern void dccp_timestamp(const struct sock *sk, struct timeval *tv); 346 347 static inline suseconds_t timeval_usecs(const struct timeval *tv) 348 { 349 return tv->tv_sec * USEC_PER_SEC + tv->tv_usec; 350 } 351 352 static inline suseconds_t timeval_delta(const struct timeval *large, 353 const struct timeval *small) 354 { 355 time_t secs = large->tv_sec - small->tv_sec; 356 suseconds_t usecs = large->tv_usec - small->tv_usec; 357 358 if (usecs < 0) { 359 secs--; 360 usecs += USEC_PER_SEC; 361 } 362 return secs * USEC_PER_SEC + usecs; 363 } 364 365 static inline void timeval_add_usecs(struct timeval *tv, 366 const suseconds_t usecs) 367 { 368 tv->tv_usec += usecs; 369 while (tv->tv_usec >= USEC_PER_SEC) { 370 tv->tv_sec++; 371 tv->tv_usec -= USEC_PER_SEC; 372 } 373 } 374 375 static inline void timeval_sub_usecs(struct timeval *tv, 376 const suseconds_t usecs) 377 { 378 tv->tv_usec -= usecs; 379 while (tv->tv_usec < 0) { 380 tv->tv_sec--; 381 tv->tv_usec += USEC_PER_SEC; 382 } 383 } 384 385 #ifdef CONFIG_SYSCTL 386 extern int dccp_sysctl_init(void); 387 extern void dccp_sysctl_exit(void); 388 #else 389 static inline int dccp_sysctl_init(void) 390 { 391 return 0; 392 } 393 394 static inline void dccp_sysctl_exit(void) 395 { 396 } 397 #endif 398 399 #endif /* _DCCP_H */ 400