1 /* SCTP kernel reference Implementation 2 * (C) Copyright IBM Corp. 2001, 2004 3 * Copyright (c) 1999-2000 Cisco, Inc. 4 * Copyright (c) 1999-2001 Motorola, Inc. 5 * Copyright (c) 2001-2003 Intel Corp. 6 * 7 * This file is part of the SCTP kernel reference Implementation 8 * 9 * The base lksctp header. 10 * 11 * The SCTP reference implementation is free software; 12 * you can redistribute it and/or modify it under the terms of 13 * the GNU General Public License as published by 14 * the Free Software Foundation; either version 2, or (at your option) 15 * any later version. 16 * 17 * The SCTP reference implementation is distributed in the hope that it 18 * will be useful, but WITHOUT ANY WARRANTY; without even the implied 19 * ************************ 20 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 21 * See the GNU General Public License for more details. 22 * 23 * You should have received a copy of the GNU General Public License 24 * along with GNU CC; see the file COPYING. If not, write to 25 * the Free Software Foundation, 59 Temple Place - Suite 330, 26 * Boston, MA 02111-1307, USA. 27 * 28 * Please send any bug reports or fixes you make to the 29 * email address(es): 30 * lksctp developers <lksctp-developers@lists.sourceforge.net> 31 * 32 * Or submit a bug report through the following website: 33 * http://www.sf.net/projects/lksctp 34 * 35 * Written or modified by: 36 * La Monte H.P. Yarroll <piggy@acm.org> 37 * Xingang Guo <xingang.guo@intel.com> 38 * Jon Grimm <jgrimm@us.ibm.com> 39 * Daisy Chang <daisyc@us.ibm.com> 40 * Sridhar Samudrala <sri@us.ibm.com> 41 * Ardelle Fan <ardelle.fan@intel.com> 42 * Ryan Layer <rmlayer@us.ibm.com> 43 * Kevin Gao <kevin.gao@intel.com> 44 * 45 * Any bugs reported given to us we will try to fix... any fixes shared will 46 * be incorporated into the next SCTP release. 47 */ 48 49 #ifndef __net_sctp_h__ 50 #define __net_sctp_h__ 51 52 /* Header Strategy. 53 * Start getting some control over the header file depencies: 54 * includes 55 * constants 56 * structs 57 * prototypes 58 * macros, externs, and inlines 59 * 60 * Move test_frame specific items out of the kernel headers 61 * and into the test frame headers. This is not perfect in any sense 62 * and will continue to evolve. 63 */ 64 65 66 #include <linux/config.h> 67 68 #ifdef TEST_FRAME 69 #undef CONFIG_PROC_FS 70 #undef CONFIG_SCTP_DBG_OBJCNT 71 #undef CONFIG_SYSCTL 72 #endif /* TEST_FRAME */ 73 74 #include <linux/types.h> 75 #include <linux/slab.h> 76 #include <linux/in.h> 77 #include <linux/tty.h> 78 #include <linux/proc_fs.h> 79 #include <linux/spinlock.h> 80 #include <linux/jiffies.h> 81 #include <linux/idr.h> 82 83 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 84 #include <net/ipv6.h> 85 #include <net/ip6_route.h> 86 #endif 87 88 #include <asm/uaccess.h> 89 #include <asm/page.h> 90 #include <net/sock.h> 91 #include <net/snmp.h> 92 #include <net/sctp/structs.h> 93 #include <net/sctp/constants.h> 94 95 96 /* Set SCTP_DEBUG flag via config if not already set. */ 97 #ifndef SCTP_DEBUG 98 #ifdef CONFIG_SCTP_DBG_MSG 99 #define SCTP_DEBUG 1 100 #else 101 #define SCTP_DEBUG 0 102 #endif /* CONFIG_SCTP_DBG */ 103 #endif /* SCTP_DEBUG */ 104 105 #ifdef CONFIG_IP_SCTP_MODULE 106 #define SCTP_PROTOSW_FLAG 0 107 #else /* static! */ 108 #define SCTP_PROTOSW_FLAG INET_PROTOSW_PERMANENT 109 #endif 110 111 112 /* Certain internal static functions need to be exported when 113 * compiled into the test frame. 114 */ 115 #ifndef SCTP_STATIC 116 #define SCTP_STATIC static 117 #endif 118 119 /* 120 * Function declarations. 121 */ 122 123 /* 124 * sctp/protocol.c 125 */ 126 extern struct sock *sctp_get_ctl_sock(void); 127 extern int sctp_copy_local_addr_list(struct sctp_bind_addr *, 128 sctp_scope_t, int gfp, int flags); 129 extern struct sctp_pf *sctp_get_pf_specific(sa_family_t family); 130 extern int sctp_register_pf(struct sctp_pf *, sa_family_t); 131 132 /* 133 * sctp/socket.c 134 */ 135 int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb); 136 int sctp_inet_listen(struct socket *sock, int backlog); 137 void sctp_write_space(struct sock *sk); 138 unsigned int sctp_poll(struct file *file, struct socket *sock, 139 poll_table *wait); 140 141 /* 142 * sctp/primitive.c 143 */ 144 int sctp_primitive_ASSOCIATE(struct sctp_association *, void *arg); 145 int sctp_primitive_SHUTDOWN(struct sctp_association *, void *arg); 146 int sctp_primitive_ABORT(struct sctp_association *, void *arg); 147 int sctp_primitive_SEND(struct sctp_association *, void *arg); 148 int sctp_primitive_REQUESTHEARTBEAT(struct sctp_association *, void *arg); 149 int sctp_primitive_ASCONF(struct sctp_association *, void *arg); 150 151 /* 152 * sctp/crc32c.c 153 */ 154 __u32 sctp_start_cksum(__u8 *ptr, __u16 count); 155 __u32 sctp_update_cksum(__u8 *ptr, __u16 count, __u32 cksum); 156 __u32 sctp_end_cksum(__u32 cksum); 157 __u32 sctp_update_copy_cksum(__u8 *, __u8 *, __u16 count, __u32 cksum); 158 159 /* 160 * sctp/input.c 161 */ 162 int sctp_rcv(struct sk_buff *skb); 163 void sctp_v4_err(struct sk_buff *skb, u32 info); 164 void sctp_hash_established(struct sctp_association *); 165 void sctp_unhash_established(struct sctp_association *); 166 void sctp_hash_endpoint(struct sctp_endpoint *); 167 void sctp_unhash_endpoint(struct sctp_endpoint *); 168 struct sock *sctp_err_lookup(int family, struct sk_buff *, 169 struct sctphdr *, struct sctp_endpoint **, 170 struct sctp_association **, 171 struct sctp_transport **); 172 void sctp_err_finish(struct sock *, struct sctp_endpoint *, 173 struct sctp_association *); 174 void sctp_icmp_frag_needed(struct sock *, struct sctp_association *, 175 struct sctp_transport *t, __u32 pmtu); 176 void sctp_icmp_proto_unreachable(struct sock *sk, 177 struct sctp_endpoint *ep, 178 struct sctp_association *asoc, 179 struct sctp_transport *t); 180 181 /* 182 * Section: Macros, externs, and inlines 183 */ 184 185 186 #ifdef TEST_FRAME 187 #include <test_frame.h> 188 #else 189 190 /* spin lock wrappers. */ 191 #define sctp_spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags) 192 #define sctp_spin_unlock_irqrestore(lock, flags) \ 193 spin_unlock_irqrestore(lock, flags) 194 #define sctp_local_bh_disable() local_bh_disable() 195 #define sctp_local_bh_enable() local_bh_enable() 196 #define sctp_spin_lock(lock) spin_lock(lock) 197 #define sctp_spin_unlock(lock) spin_unlock(lock) 198 #define sctp_write_lock(lock) write_lock(lock) 199 #define sctp_write_unlock(lock) write_unlock(lock) 200 #define sctp_read_lock(lock) read_lock(lock) 201 #define sctp_read_unlock(lock) read_unlock(lock) 202 203 /* sock lock wrappers. */ 204 #define sctp_lock_sock(sk) lock_sock(sk) 205 #define sctp_release_sock(sk) release_sock(sk) 206 #define sctp_bh_lock_sock(sk) bh_lock_sock(sk) 207 #define sctp_bh_unlock_sock(sk) bh_unlock_sock(sk) 208 #define SCTP_SOCK_SLEEP_PRE(sk) SOCK_SLEEP_PRE(sk) 209 #define SCTP_SOCK_SLEEP_POST(sk) SOCK_SLEEP_POST(sk) 210 211 /* SCTP SNMP MIB stats handlers */ 212 DECLARE_SNMP_STAT(struct sctp_mib, sctp_statistics); 213 #define SCTP_INC_STATS(field) SNMP_INC_STATS(sctp_statistics, field) 214 #define SCTP_INC_STATS_BH(field) SNMP_INC_STATS_BH(sctp_statistics, field) 215 #define SCTP_INC_STATS_USER(field) SNMP_INC_STATS_USER(sctp_statistics, field) 216 #define SCTP_DEC_STATS(field) SNMP_DEC_STATS(sctp_statistics, field) 217 218 #endif /* !TEST_FRAME */ 219 220 221 /* Print debugging messages. */ 222 #if SCTP_DEBUG 223 extern int sctp_debug_flag; 224 #define SCTP_DEBUG_PRINTK(whatever...) \ 225 ((void) (sctp_debug_flag && printk(KERN_DEBUG whatever))) 226 #define SCTP_ENABLE_DEBUG { sctp_debug_flag = 1; } 227 #define SCTP_DISABLE_DEBUG { sctp_debug_flag = 0; } 228 229 #define SCTP_ASSERT(expr, str, func) \ 230 if (!(expr)) { \ 231 SCTP_DEBUG_PRINTK("Assertion Failed: %s(%s) at %s:%s:%d\n", \ 232 str, (#expr), __FILE__, __FUNCTION__, __LINE__); \ 233 func; \ 234 } 235 236 #else /* SCTP_DEBUG */ 237 238 #define SCTP_DEBUG_PRINTK(whatever...) 239 #define SCTP_ENABLE_DEBUG 240 #define SCTP_DISABLE_DEBUG 241 #define SCTP_ASSERT(expr, str, func) 242 243 #endif /* SCTP_DEBUG */ 244 245 246 /* 247 * Macros for keeping a global reference of object allocations. 248 */ 249 #ifdef CONFIG_SCTP_DBG_OBJCNT 250 251 extern atomic_t sctp_dbg_objcnt_sock; 252 extern atomic_t sctp_dbg_objcnt_ep; 253 extern atomic_t sctp_dbg_objcnt_assoc; 254 extern atomic_t sctp_dbg_objcnt_transport; 255 extern atomic_t sctp_dbg_objcnt_chunk; 256 extern atomic_t sctp_dbg_objcnt_bind_addr; 257 extern atomic_t sctp_dbg_objcnt_bind_bucket; 258 extern atomic_t sctp_dbg_objcnt_addr; 259 extern atomic_t sctp_dbg_objcnt_ssnmap; 260 extern atomic_t sctp_dbg_objcnt_datamsg; 261 262 /* Macros to atomically increment/decrement objcnt counters. */ 263 #define SCTP_DBG_OBJCNT_INC(name) \ 264 atomic_inc(&sctp_dbg_objcnt_## name) 265 #define SCTP_DBG_OBJCNT_DEC(name) \ 266 atomic_dec(&sctp_dbg_objcnt_## name) 267 #define SCTP_DBG_OBJCNT(name) \ 268 atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0) 269 270 /* Macro to help create new entries in in the global array of 271 * objcnt counters. 272 */ 273 #define SCTP_DBG_OBJCNT_ENTRY(name) \ 274 {.label= #name, .counter= &sctp_dbg_objcnt_## name} 275 276 void sctp_dbg_objcnt_init(void); 277 void sctp_dbg_objcnt_exit(void); 278 279 #else 280 281 #define SCTP_DBG_OBJCNT_INC(name) 282 #define SCTP_DBG_OBJCNT_DEC(name) 283 284 static inline void sctp_dbg_objcnt_init(void) { return; } 285 static inline void sctp_dbg_objcnt_exit(void) { return; } 286 287 #endif /* CONFIG_SCTP_DBG_OBJCOUNT */ 288 289 #if defined CONFIG_SYSCTL 290 void sctp_sysctl_register(void); 291 void sctp_sysctl_unregister(void); 292 #else 293 static inline void sctp_sysctl_register(void) { return; } 294 static inline void sctp_sysctl_unregister(void) { return; } 295 static inline int sctp_sysctl_jiffies_ms(ctl_table *table, int __user *name, int nlen, 296 void __user *oldval, size_t __user *oldlenp, 297 void __user *newval, size_t newlen, void **context) { 298 return -ENOSYS; 299 } 300 #endif 301 302 /* Size of Supported Address Parameter for 'x' address types. */ 303 #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16)) 304 305 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) 306 307 int sctp_v6_init(void); 308 void sctp_v6_exit(void); 309 310 #else /* #ifdef defined(CONFIG_IPV6) */ 311 312 static inline int sctp_v6_init(void) { return 0; } 313 static inline void sctp_v6_exit(void) { return; } 314 315 #endif /* #if defined(CONFIG_IPV6) */ 316 317 /* Some wrappers, in case crypto not available. */ 318 #if defined (CONFIG_CRYPTO_HMAC) 319 #define sctp_crypto_alloc_tfm crypto_alloc_tfm 320 #define sctp_crypto_free_tfm crypto_free_tfm 321 #define sctp_crypto_hmac crypto_hmac 322 #else 323 #define sctp_crypto_alloc_tfm(x...) NULL 324 #define sctp_crypto_free_tfm(x...) 325 #define sctp_crypto_hmac(x...) 326 #endif 327 328 329 /* Map an association to an assoc_id. */ 330 static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc) 331 { 332 return (asoc?asoc->assoc_id:0); 333 } 334 335 /* Look up the association by its id. */ 336 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id); 337 338 339 /* A macro to walk a list of skbs. */ 340 #define sctp_skb_for_each(pos, head, tmp) \ 341 for (pos = (head)->next;\ 342 tmp = (pos)->next, pos != ((struct sk_buff *)(head));\ 343 pos = tmp) 344 345 346 /* A helper to append an entire skb list (list) to another (head). */ 347 static inline void sctp_skb_list_tail(struct sk_buff_head *list, 348 struct sk_buff_head *head) 349 { 350 unsigned long flags; 351 352 sctp_spin_lock_irqsave(&head->lock, flags); 353 sctp_spin_lock(&list->lock); 354 355 list_splice((struct list_head *)list, (struct list_head *)head->prev); 356 357 head->qlen += list->qlen; 358 list->qlen = 0; 359 360 sctp_spin_unlock(&list->lock); 361 sctp_spin_unlock_irqrestore(&head->lock, flags); 362 } 363 364 /** 365 * sctp_list_dequeue - remove from the head of the queue 366 * @list: list to dequeue from 367 * 368 * Remove the head of the list. The head item is 369 * returned or %NULL if the list is empty. 370 */ 371 372 static inline struct list_head *sctp_list_dequeue(struct list_head *list) 373 { 374 struct list_head *result = NULL; 375 376 if (list->next != list) { 377 result = list->next; 378 list->next = result->next; 379 list->next->prev = list; 380 INIT_LIST_HEAD(result); 381 } 382 return result; 383 } 384 385 /* Tests if the list has one and only one entry. */ 386 static inline int sctp_list_single_entry(struct list_head *head) 387 { 388 return ((head->next != head) && (head->next == head->prev)); 389 } 390 391 /* Calculate the size (in bytes) occupied by the data of an iovec. */ 392 static inline size_t get_user_iov_size(struct iovec *iov, int iovlen) 393 { 394 size_t retval = 0; 395 396 for (; iovlen > 0; --iovlen) { 397 retval += iov->iov_len; 398 iov++; 399 } 400 401 return retval; 402 } 403 404 /* Generate a random jitter in the range of -50% ~ +50% of input RTO. */ 405 static inline __s32 sctp_jitter(__u32 rto) 406 { 407 static __u32 sctp_rand; 408 __s32 ret; 409 410 /* Avoid divide by zero. */ 411 if (!rto) 412 rto = 1; 413 414 sctp_rand += jiffies; 415 sctp_rand ^= (sctp_rand << 12); 416 sctp_rand ^= (sctp_rand >> 20); 417 418 /* Choose random number from 0 to rto, then move to -50% ~ +50% 419 * of rto. 420 */ 421 ret = sctp_rand % rto - (rto >> 1); 422 return ret; 423 } 424 425 /* Break down data chunks at this point. */ 426 static inline int sctp_frag_point(const struct sctp_sock *sp, int pmtu) 427 { 428 int frag = pmtu; 429 430 frag -= sp->pf->af->net_header_len; 431 frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk); 432 433 if (sp->user_frag) 434 frag = min_t(int, frag, sp->user_frag); 435 436 frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN); 437 438 return frag; 439 } 440 441 /* Walk through a list of TLV parameters. Don't trust the 442 * individual parameter lengths and instead depend on 443 * the chunk length to indicate when to stop. Make sure 444 * there is room for a param header too. 445 */ 446 #define sctp_walk_params(pos, chunk, member)\ 447 _sctp_walk_params((pos), (chunk), WORD_ROUND(ntohs((chunk)->chunk_hdr.length)), member) 448 449 #define _sctp_walk_params(pos, chunk, end, member)\ 450 for (pos.v = chunk->member;\ 451 pos.v <= (void *)chunk + end - sizeof(sctp_paramhdr_t) &&\ 452 pos.v <= (void *)chunk + end - WORD_ROUND(ntohs(pos.p->length)) &&\ 453 ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\ 454 pos.v += WORD_ROUND(ntohs(pos.p->length))) 455 456 #define sctp_walk_errors(err, chunk_hdr)\ 457 _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length)) 458 459 #define _sctp_walk_errors(err, chunk_hdr, end)\ 460 for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \ 461 sizeof(sctp_chunkhdr_t));\ 462 (void *)err <= (void *)chunk_hdr + end - sizeof(sctp_errhdr_t) &&\ 463 (void *)err <= (void *)chunk_hdr + end - WORD_ROUND(ntohs(err->length)) &&\ 464 ntohs(err->length) >= sizeof(sctp_errhdr_t); \ 465 err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length)))) 466 467 #define sctp_walk_fwdtsn(pos, chunk)\ 468 _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk)) 469 470 #define _sctp_walk_fwdtsn(pos, chunk, end)\ 471 for (pos = chunk->subh.fwdtsn_hdr->skip;\ 472 (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\ 473 pos++) 474 475 /* Round an int up to the next multiple of 4. */ 476 #define WORD_ROUND(s) (((s)+3)&~3) 477 478 /* Make a new instance of type. */ 479 #define t_new(type, flags) (type *)kmalloc(sizeof(type), flags) 480 481 /* Compare two timevals. */ 482 #define tv_lt(s, t) \ 483 (s.tv_sec < t.tv_sec || (s.tv_sec == t.tv_sec && s.tv_usec < t.tv_usec)) 484 485 /* Add tv1 to tv2. */ 486 #define TIMEVAL_ADD(tv1, tv2) \ 487 ({ \ 488 suseconds_t usecs = (tv2).tv_usec + (tv1).tv_usec; \ 489 time_t secs = (tv2).tv_sec + (tv1).tv_sec; \ 490 \ 491 if (usecs >= 1000000) { \ 492 usecs -= 1000000; \ 493 secs++; \ 494 } \ 495 (tv2).tv_sec = secs; \ 496 (tv2).tv_usec = usecs; \ 497 }) 498 499 /* External references. */ 500 501 extern struct proto sctp_prot; 502 extern struct proto sctpv6_prot; 503 extern struct proc_dir_entry *proc_net_sctp; 504 void sctp_put_port(struct sock *sk); 505 506 extern struct idr sctp_assocs_id; 507 extern spinlock_t sctp_assocs_id_lock; 508 509 /* Static inline functions. */ 510 511 /* Convert from an IP version number to an Address Family symbol. */ 512 static inline int ipver2af(__u8 ipver) 513 { 514 switch (ipver) { 515 case 4: 516 return AF_INET; 517 case 6: 518 return AF_INET6; 519 default: 520 return 0; 521 }; 522 } 523 524 /* Convert from an address parameter type to an address family. */ 525 static inline int param_type2af(__u16 type) 526 { 527 switch (type) { 528 case SCTP_PARAM_IPV4_ADDRESS: 529 return AF_INET; 530 case SCTP_PARAM_IPV6_ADDRESS: 531 return AF_INET6; 532 default: 533 return 0; 534 }; 535 } 536 537 /* Perform some sanity checks. */ 538 static inline int sctp_sanity_check(void) 539 { 540 SCTP_ASSERT(sizeof(struct sctp_ulpevent) <= 541 sizeof(((struct sk_buff *)0)->cb), 542 "SCTP: ulpevent does not fit in skb!\n", return 0); 543 544 return 1; 545 } 546 547 /* Warning: The following hash functions assume a power of two 'size'. */ 548 /* This is the hash function for the SCTP port hash table. */ 549 static inline int sctp_phashfn(__u16 lport) 550 { 551 return (lport & (sctp_port_hashsize - 1)); 552 } 553 554 /* This is the hash function for the endpoint hash table. */ 555 static inline int sctp_ep_hashfn(__u16 lport) 556 { 557 return (lport & (sctp_ep_hashsize - 1)); 558 } 559 560 /* This is the hash function for the association hash table. */ 561 static inline int sctp_assoc_hashfn(__u16 lport, __u16 rport) 562 { 563 int h = (lport << 16) + rport; 564 h ^= h>>8; 565 return (h & (sctp_assoc_hashsize - 1)); 566 } 567 568 /* This is the hash function for the association hash table. This is 569 * not used yet, but could be used as a better hash function when 570 * we have a vtag. 571 */ 572 static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag) 573 { 574 int h = (lport << 16) + rport; 575 h ^= vtag; 576 return (h & (sctp_assoc_hashsize-1)); 577 } 578 579 /* Is a socket of this style? */ 580 #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style)) 581 static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style) 582 { 583 return sctp_sk(sk)->type == style; 584 } 585 586 /* Is the association in this state? */ 587 #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state)) 588 static inline int __sctp_state(const struct sctp_association *asoc, 589 sctp_state_t state) 590 { 591 return asoc->state == state; 592 } 593 594 /* Is the socket in this state? */ 595 #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state)) 596 static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state) 597 { 598 return sk->sk_state == state; 599 } 600 601 /* Map v4-mapped v6 address back to v4 address */ 602 static inline void sctp_v6_map_v4(union sctp_addr *addr) 603 { 604 addr->v4.sin_family = AF_INET; 605 addr->v4.sin_port = addr->v6.sin6_port; 606 addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3]; 607 } 608 609 /* Map v4 address to v4-mapped v6 address */ 610 static inline void sctp_v4_map_v6(union sctp_addr *addr) 611 { 612 addr->v6.sin6_family = AF_INET6; 613 addr->v6.sin6_port = addr->v4.sin_port; 614 addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr; 615 addr->v6.sin6_addr.s6_addr32[0] = 0; 616 addr->v6.sin6_addr.s6_addr32[1] = 0; 617 addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff); 618 } 619 620 #endif /* __net_sctp_h__ */ 621