1 /* SCTP kernel 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 implementation
8 *
9 * The base lksctp header.
10 *
11 * This SCTP 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 * This SCTP 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 #include <linux/types.h>
66 #include <linux/slab.h>
67 #include <linux/in.h>
68 #include <linux/tty.h>
69 #include <linux/proc_fs.h>
70 #include <linux/spinlock.h>
71 #include <linux/jiffies.h>
72 #include <linux/idr.h>
73
74 #if IS_ENABLED(CONFIG_IPV6)
75 #include <net/ipv6.h>
76 #include <net/ip6_route.h>
77 #endif
78
79 #include <asm/uaccess.h>
80 #include <asm/page.h>
81 #include <net/sock.h>
82 #include <net/snmp.h>
83 #include <net/sctp/structs.h>
84 #include <net/sctp/constants.h>
85
86
87 /* Set SCTP_DEBUG flag via config if not already set. */
88 #ifndef SCTP_DEBUG
89 #ifdef CONFIG_SCTP_DBG_MSG
90 #define SCTP_DEBUG 1
91 #else
92 #define SCTP_DEBUG 0
93 #endif /* CONFIG_SCTP_DBG */
94 #endif /* SCTP_DEBUG */
95
96 #ifdef CONFIG_IP_SCTP_MODULE
97 #define SCTP_PROTOSW_FLAG 0
98 #else /* static! */
99 #define SCTP_PROTOSW_FLAG INET_PROTOSW_PERMANENT
100 #endif
101
102
103 /* Certain internal static functions need to be exported when
104 * compiled into the test frame.
105 */
106 #ifndef SCTP_STATIC
107 #define SCTP_STATIC static
108 #endif
109
110 /*
111 * Function declarations.
112 */
113
114 /*
115 * sctp/protocol.c
116 */
117 extern int sctp_copy_local_addr_list(struct net *, struct sctp_bind_addr *,
118 sctp_scope_t, gfp_t gfp,
119 int flags);
120 extern struct sctp_pf *sctp_get_pf_specific(sa_family_t family);
121 extern int sctp_register_pf(struct sctp_pf *, sa_family_t);
122 extern void sctp_addr_wq_mgmt(struct net *, struct sctp_sockaddr_entry *, int);
123
124 /*
125 * sctp/socket.c
126 */
127 int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb);
128 int sctp_inet_listen(struct socket *sock, int backlog);
129 void sctp_write_space(struct sock *sk);
130 void sctp_data_ready(struct sock *sk, int len);
131 unsigned int sctp_poll(struct file *file, struct socket *sock,
132 poll_table *wait);
133 void sctp_sock_rfree(struct sk_buff *skb);
134 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
135 struct sctp_association *asoc);
136 extern struct percpu_counter sctp_sockets_allocated;
137 extern int sctp_asconf_mgmt(struct sctp_sock *, struct sctp_sockaddr_entry *);
138
139 /*
140 * sctp/primitive.c
141 */
142 int sctp_primitive_ASSOCIATE(struct net *, struct sctp_association *, void *arg);
143 int sctp_primitive_SHUTDOWN(struct net *, struct sctp_association *, void *arg);
144 int sctp_primitive_ABORT(struct net *, struct sctp_association *, void *arg);
145 int sctp_primitive_SEND(struct net *, struct sctp_association *, void *arg);
146 int sctp_primitive_REQUESTHEARTBEAT(struct net *, struct sctp_association *, void *arg);
147 int sctp_primitive_ASCONF(struct net *, struct sctp_association *, void *arg);
148
149 /*
150 * sctp/input.c
151 */
152 int sctp_rcv(struct sk_buff *skb);
153 void sctp_v4_err(struct sk_buff *skb, u32 info);
154 void sctp_hash_established(struct sctp_association *);
155 void sctp_unhash_established(struct sctp_association *);
156 void sctp_hash_endpoint(struct sctp_endpoint *);
157 void sctp_unhash_endpoint(struct sctp_endpoint *);
158 struct sock *sctp_err_lookup(struct net *net, int family, struct sk_buff *,
159 struct sctphdr *, struct sctp_association **,
160 struct sctp_transport **);
161 void sctp_err_finish(struct sock *, struct sctp_association *);
162 void sctp_icmp_frag_needed(struct sock *, struct sctp_association *,
163 struct sctp_transport *t, __u32 pmtu);
164 void sctp_icmp_redirect(struct sock *, struct sctp_transport *,
165 struct sk_buff *);
166 void sctp_icmp_proto_unreachable(struct sock *sk,
167 struct sctp_association *asoc,
168 struct sctp_transport *t);
169 void sctp_backlog_migrate(struct sctp_association *assoc,
170 struct sock *oldsk, struct sock *newsk);
171
172 /*
173 * sctp/proc.c
174 */
175 int sctp_snmp_proc_init(struct net *net);
176 void sctp_snmp_proc_exit(struct net *net);
177 int sctp_eps_proc_init(struct net *net);
178 void sctp_eps_proc_exit(struct net *net);
179 int sctp_assocs_proc_init(struct net *net);
180 void sctp_assocs_proc_exit(struct net *net);
181 int sctp_remaddr_proc_init(struct net *net);
182 void sctp_remaddr_proc_exit(struct net *net);
183
184
185 /*
186 * Module global variables
187 */
188
189 /*
190 * sctp/protocol.c
191 */
192 extern struct kmem_cache *sctp_chunk_cachep __read_mostly;
193 extern struct kmem_cache *sctp_bucket_cachep __read_mostly;
194
195 /*
196 * Section: Macros, externs, and inlines
197 */
198
199
200 #ifdef TEST_FRAME
201 #include <test_frame.h>
202 #else
203
204 /* spin lock wrappers. */
205 #define sctp_spin_lock_irqsave(lock, flags) spin_lock_irqsave(lock, flags)
206 #define sctp_spin_unlock_irqrestore(lock, flags) \
207 spin_unlock_irqrestore(lock, flags)
208 #define sctp_local_bh_disable() local_bh_disable()
209 #define sctp_local_bh_enable() local_bh_enable()
210 #define sctp_spin_lock(lock) spin_lock(lock)
211 #define sctp_spin_unlock(lock) spin_unlock(lock)
212 #define sctp_write_lock(lock) write_lock(lock)
213 #define sctp_write_unlock(lock) write_unlock(lock)
214 #define sctp_read_lock(lock) read_lock(lock)
215 #define sctp_read_unlock(lock) read_unlock(lock)
216
217 /* sock lock wrappers. */
218 #define sctp_lock_sock(sk) lock_sock(sk)
219 #define sctp_release_sock(sk) release_sock(sk)
220 #define sctp_bh_lock_sock(sk) bh_lock_sock(sk)
221 #define sctp_bh_unlock_sock(sk) bh_unlock_sock(sk)
222
223 /* SCTP SNMP MIB stats handlers */
224 #define SCTP_INC_STATS(net, field) SNMP_INC_STATS((net)->sctp.sctp_statistics, field)
225 #define SCTP_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->sctp.sctp_statistics, field)
226 #define SCTP_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->sctp.sctp_statistics, field)
227 #define SCTP_DEC_STATS(net, field) SNMP_DEC_STATS((net)->sctp.sctp_statistics, field)
228
229 #endif /* !TEST_FRAME */
230
231 /* sctp mib definitions */
232 enum {
233 SCTP_MIB_NUM = 0,
234 SCTP_MIB_CURRESTAB, /* CurrEstab */
235 SCTP_MIB_ACTIVEESTABS, /* ActiveEstabs */
236 SCTP_MIB_PASSIVEESTABS, /* PassiveEstabs */
237 SCTP_MIB_ABORTEDS, /* Aborteds */
238 SCTP_MIB_SHUTDOWNS, /* Shutdowns */
239 SCTP_MIB_OUTOFBLUES, /* OutOfBlues */
240 SCTP_MIB_CHECKSUMERRORS, /* ChecksumErrors */
241 SCTP_MIB_OUTCTRLCHUNKS, /* OutCtrlChunks */
242 SCTP_MIB_OUTORDERCHUNKS, /* OutOrderChunks */
243 SCTP_MIB_OUTUNORDERCHUNKS, /* OutUnorderChunks */
244 SCTP_MIB_INCTRLCHUNKS, /* InCtrlChunks */
245 SCTP_MIB_INORDERCHUNKS, /* InOrderChunks */
246 SCTP_MIB_INUNORDERCHUNKS, /* InUnorderChunks */
247 SCTP_MIB_FRAGUSRMSGS, /* FragUsrMsgs */
248 SCTP_MIB_REASMUSRMSGS, /* ReasmUsrMsgs */
249 SCTP_MIB_OUTSCTPPACKS, /* OutSCTPPacks */
250 SCTP_MIB_INSCTPPACKS, /* InSCTPPacks */
251 SCTP_MIB_T1_INIT_EXPIREDS,
252 SCTP_MIB_T1_COOKIE_EXPIREDS,
253 SCTP_MIB_T2_SHUTDOWN_EXPIREDS,
254 SCTP_MIB_T3_RTX_EXPIREDS,
255 SCTP_MIB_T4_RTO_EXPIREDS,
256 SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS,
257 SCTP_MIB_DELAY_SACK_EXPIREDS,
258 SCTP_MIB_AUTOCLOSE_EXPIREDS,
259 SCTP_MIB_T1_RETRANSMITS,
260 SCTP_MIB_T3_RETRANSMITS,
261 SCTP_MIB_PMTUD_RETRANSMITS,
262 SCTP_MIB_FAST_RETRANSMITS,
263 SCTP_MIB_IN_PKT_SOFTIRQ,
264 SCTP_MIB_IN_PKT_BACKLOG,
265 SCTP_MIB_IN_PKT_DISCARDS,
266 SCTP_MIB_IN_DATA_CHUNK_DISCARDS,
267 __SCTP_MIB_MAX
268 };
269
270 #define SCTP_MIB_MAX __SCTP_MIB_MAX
271 struct sctp_mib {
272 unsigned long mibs[SCTP_MIB_MAX];
273 };
274
275 /* helper function to track stats about max rto and related transport */
sctp_max_rto(struct sctp_association * asoc,struct sctp_transport * trans)276 static inline void sctp_max_rto(struct sctp_association *asoc,
277 struct sctp_transport *trans)
278 {
279 if (asoc->stats.max_obs_rto < (__u64)trans->rto) {
280 asoc->stats.max_obs_rto = trans->rto;
281 memset(&asoc->stats.obs_rto_ipaddr, 0,
282 sizeof(struct sockaddr_storage));
283 memcpy(&asoc->stats.obs_rto_ipaddr, &trans->ipaddr,
284 trans->af_specific->sockaddr_len);
285 }
286 }
287
288 /* Print debugging messages. */
289 #if SCTP_DEBUG
290 extern int sctp_debug_flag;
291 #define SCTP_DEBUG_PRINTK(fmt, args...) \
292 do { \
293 if (sctp_debug_flag) \
294 printk(KERN_DEBUG pr_fmt(fmt), ##args); \
295 } while (0)
296 #define SCTP_DEBUG_PRINTK_CONT(fmt, args...) \
297 do { \
298 if (sctp_debug_flag) \
299 pr_cont(fmt, ##args); \
300 } while (0)
301 #define SCTP_DEBUG_PRINTK_IPADDR(fmt_lead, fmt_trail, \
302 args_lead, addr, args_trail...) \
303 do { \
304 const union sctp_addr *_addr = (addr); \
305 if (sctp_debug_flag) { \
306 if (_addr->sa.sa_family == AF_INET6) { \
307 printk(KERN_DEBUG \
308 pr_fmt(fmt_lead "%pI6" fmt_trail), \
309 args_lead, \
310 &_addr->v6.sin6_addr, \
311 args_trail); \
312 } else { \
313 printk(KERN_DEBUG \
314 pr_fmt(fmt_lead "%pI4" fmt_trail), \
315 args_lead, \
316 &_addr->v4.sin_addr.s_addr, \
317 args_trail); \
318 } \
319 } \
320 } while (0)
321 #define SCTP_ENABLE_DEBUG { sctp_debug_flag = 1; }
322 #define SCTP_DISABLE_DEBUG { sctp_debug_flag = 0; }
323
324 #define SCTP_ASSERT(expr, str, func) \
325 if (!(expr)) { \
326 SCTP_DEBUG_PRINTK("Assertion Failed: %s(%s) at %s:%s:%d\n", \
327 str, (#expr), __FILE__, __func__, __LINE__); \
328 func; \
329 }
330
331 #else /* SCTP_DEBUG */
332
333 #define SCTP_DEBUG_PRINTK(whatever...)
334 #define SCTP_DEBUG_PRINTK_CONT(fmt, args...)
335 #define SCTP_DEBUG_PRINTK_IPADDR(whatever...)
336 #define SCTP_ENABLE_DEBUG
337 #define SCTP_DISABLE_DEBUG
338 #define SCTP_ASSERT(expr, str, func)
339
340 #endif /* SCTP_DEBUG */
341
342
343 /*
344 * Macros for keeping a global reference of object allocations.
345 */
346 #ifdef CONFIG_SCTP_DBG_OBJCNT
347
348 extern atomic_t sctp_dbg_objcnt_sock;
349 extern atomic_t sctp_dbg_objcnt_ep;
350 extern atomic_t sctp_dbg_objcnt_assoc;
351 extern atomic_t sctp_dbg_objcnt_transport;
352 extern atomic_t sctp_dbg_objcnt_chunk;
353 extern atomic_t sctp_dbg_objcnt_bind_addr;
354 extern atomic_t sctp_dbg_objcnt_bind_bucket;
355 extern atomic_t sctp_dbg_objcnt_addr;
356 extern atomic_t sctp_dbg_objcnt_ssnmap;
357 extern atomic_t sctp_dbg_objcnt_datamsg;
358 extern atomic_t sctp_dbg_objcnt_keys;
359
360 /* Macros to atomically increment/decrement objcnt counters. */
361 #define SCTP_DBG_OBJCNT_INC(name) \
362 atomic_inc(&sctp_dbg_objcnt_## name)
363 #define SCTP_DBG_OBJCNT_DEC(name) \
364 atomic_dec(&sctp_dbg_objcnt_## name)
365 #define SCTP_DBG_OBJCNT(name) \
366 atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0)
367
368 /* Macro to help create new entries in in the global array of
369 * objcnt counters.
370 */
371 #define SCTP_DBG_OBJCNT_ENTRY(name) \
372 {.label= #name, .counter= &sctp_dbg_objcnt_## name}
373
374 void sctp_dbg_objcnt_init(struct net *);
375 void sctp_dbg_objcnt_exit(struct net *);
376
377 #else
378
379 #define SCTP_DBG_OBJCNT_INC(name)
380 #define SCTP_DBG_OBJCNT_DEC(name)
381
sctp_dbg_objcnt_init(struct net * net)382 static inline void sctp_dbg_objcnt_init(struct net *net) { return; }
sctp_dbg_objcnt_exit(struct net * net)383 static inline void sctp_dbg_objcnt_exit(struct net *net) { return; }
384
385 #endif /* CONFIG_SCTP_DBG_OBJCOUNT */
386
387 #if defined CONFIG_SYSCTL
388 void sctp_sysctl_register(void);
389 void sctp_sysctl_unregister(void);
390 int sctp_sysctl_net_register(struct net *net);
391 void sctp_sysctl_net_unregister(struct net *net);
392 #else
sctp_sysctl_register(void)393 static inline void sctp_sysctl_register(void) { return; }
sctp_sysctl_unregister(void)394 static inline void sctp_sysctl_unregister(void) { return; }
sctp_sysctl_net_register(struct net * net)395 static inline int sctp_sysctl_net_register(struct net *net) { return 0; }
sctp_sysctl_net_unregister(struct net * net)396 static inline void sctp_sysctl_net_unregister(struct net *net) { return; }
397 #endif
398
399 /* Size of Supported Address Parameter for 'x' address types. */
400 #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16))
401
402 #if IS_ENABLED(CONFIG_IPV6)
403
404 void sctp_v6_pf_init(void);
405 void sctp_v6_pf_exit(void);
406 int sctp_v6_protosw_init(void);
407 void sctp_v6_protosw_exit(void);
408 int sctp_v6_add_protocol(void);
409 void sctp_v6_del_protocol(void);
410
411 #else /* #ifdef defined(CONFIG_IPV6) */
412
sctp_v6_pf_init(void)413 static inline void sctp_v6_pf_init(void) { return; }
sctp_v6_pf_exit(void)414 static inline void sctp_v6_pf_exit(void) { return; }
sctp_v6_protosw_init(void)415 static inline int sctp_v6_protosw_init(void) { return 0; }
sctp_v6_protosw_exit(void)416 static inline void sctp_v6_protosw_exit(void) { return; }
sctp_v6_add_protocol(void)417 static inline int sctp_v6_add_protocol(void) { return 0; }
sctp_v6_del_protocol(void)418 static inline void sctp_v6_del_protocol(void) { return; }
419
420 #endif /* #if defined(CONFIG_IPV6) */
421
422
423 /* Map an association to an assoc_id. */
sctp_assoc2id(const struct sctp_association * asoc)424 static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc)
425 {
426 return asoc ? asoc->assoc_id : 0;
427 }
428
429 /* Look up the association by its id. */
430 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id);
431
432 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp);
433
434 /* A macro to walk a list of skbs. */
435 #define sctp_skb_for_each(pos, head, tmp) \
436 skb_queue_walk_safe(head, pos, tmp)
437
438 /* A helper to append an entire skb list (list) to another (head). */
sctp_skb_list_tail(struct sk_buff_head * list,struct sk_buff_head * head)439 static inline void sctp_skb_list_tail(struct sk_buff_head *list,
440 struct sk_buff_head *head)
441 {
442 unsigned long flags;
443
444 sctp_spin_lock_irqsave(&head->lock, flags);
445 sctp_spin_lock(&list->lock);
446
447 skb_queue_splice_tail_init(list, head);
448
449 sctp_spin_unlock(&list->lock);
450 sctp_spin_unlock_irqrestore(&head->lock, flags);
451 }
452
453 /**
454 * sctp_list_dequeue - remove from the head of the queue
455 * @list: list to dequeue from
456 *
457 * Remove the head of the list. The head item is
458 * returned or %NULL if the list is empty.
459 */
460
sctp_list_dequeue(struct list_head * list)461 static inline struct list_head *sctp_list_dequeue(struct list_head *list)
462 {
463 struct list_head *result = NULL;
464
465 if (list->next != list) {
466 result = list->next;
467 list->next = result->next;
468 list->next->prev = list;
469 INIT_LIST_HEAD(result);
470 }
471 return result;
472 }
473
474 /* SCTP version of skb_set_owner_r. We need this one because
475 * of the way we have to do receive buffer accounting on bundled
476 * chunks.
477 */
sctp_skb_set_owner_r(struct sk_buff * skb,struct sock * sk)478 static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk)
479 {
480 struct sctp_ulpevent *event = sctp_skb2event(skb);
481
482 skb_orphan(skb);
483 skb->sk = sk;
484 skb->destructor = sctp_sock_rfree;
485 atomic_add(event->rmem_len, &sk->sk_rmem_alloc);
486 /*
487 * This mimics the behavior of skb_set_owner_r
488 */
489 sk->sk_forward_alloc -= event->rmem_len;
490 }
491
492 /* Tests if the list has one and only one entry. */
sctp_list_single_entry(struct list_head * head)493 static inline int sctp_list_single_entry(struct list_head *head)
494 {
495 return (head->next != head) && (head->next == head->prev);
496 }
497
498 /* Generate a random jitter in the range of -50% ~ +50% of input RTO. */
sctp_jitter(__u32 rto)499 static inline __s32 sctp_jitter(__u32 rto)
500 {
501 static __u32 sctp_rand;
502 __s32 ret;
503
504 /* Avoid divide by zero. */
505 if (!rto)
506 rto = 1;
507
508 sctp_rand += jiffies;
509 sctp_rand ^= (sctp_rand << 12);
510 sctp_rand ^= (sctp_rand >> 20);
511
512 /* Choose random number from 0 to rto, then move to -50% ~ +50%
513 * of rto.
514 */
515 ret = sctp_rand % rto - (rto >> 1);
516 return ret;
517 }
518
519 /* Break down data chunks at this point. */
sctp_frag_point(const struct sctp_association * asoc,int pmtu)520 static inline int sctp_frag_point(const struct sctp_association *asoc, int pmtu)
521 {
522 struct sctp_sock *sp = sctp_sk(asoc->base.sk);
523 int frag = pmtu;
524
525 frag -= sp->pf->af->net_header_len;
526 frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk);
527
528 if (asoc->user_frag)
529 frag = min_t(int, frag, asoc->user_frag);
530
531 frag = min_t(int, frag, SCTP_MAX_CHUNK_LEN);
532
533 return frag;
534 }
535
sctp_assoc_pending_pmtu(struct sock * sk,struct sctp_association * asoc)536 static inline void sctp_assoc_pending_pmtu(struct sock *sk, struct sctp_association *asoc)
537 {
538
539 sctp_assoc_sync_pmtu(sk, asoc);
540 asoc->pmtu_pending = 0;
541 }
542
543 /* Walk through a list of TLV parameters. Don't trust the
544 * individual parameter lengths and instead depend on
545 * the chunk length to indicate when to stop. Make sure
546 * there is room for a param header too.
547 */
548 #define sctp_walk_params(pos, chunk, member)\
549 _sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member)
550
551 #define _sctp_walk_params(pos, chunk, end, member)\
552 for (pos.v = chunk->member;\
553 pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\
554 ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\
555 pos.v += WORD_ROUND(ntohs(pos.p->length)))
556
557 #define sctp_walk_errors(err, chunk_hdr)\
558 _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length))
559
560 #define _sctp_walk_errors(err, chunk_hdr, end)\
561 for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \
562 sizeof(sctp_chunkhdr_t));\
563 (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\
564 ntohs(err->length) >= sizeof(sctp_errhdr_t); \
565 err = (sctp_errhdr_t *)((void *)err + WORD_ROUND(ntohs(err->length))))
566
567 #define sctp_walk_fwdtsn(pos, chunk)\
568 _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk))
569
570 #define _sctp_walk_fwdtsn(pos, chunk, end)\
571 for (pos = chunk->subh.fwdtsn_hdr->skip;\
572 (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\
573 pos++)
574
575 /* Round an int up to the next multiple of 4. */
576 #define WORD_ROUND(s) (((s)+3)&~3)
577
578 /* Make a new instance of type. */
579 #define t_new(type, flags) kzalloc(sizeof(type), flags)
580
581 /* Compare two timevals. */
582 #define tv_lt(s, t) \
583 (s.tv_sec < t.tv_sec || (s.tv_sec == t.tv_sec && s.tv_usec < t.tv_usec))
584
585 /* Add tv1 to tv2. */
586 #define TIMEVAL_ADD(tv1, tv2) \
587 ({ \
588 suseconds_t usecs = (tv2).tv_usec + (tv1).tv_usec; \
589 time_t secs = (tv2).tv_sec + (tv1).tv_sec; \
590 \
591 if (usecs >= 1000000) { \
592 usecs -= 1000000; \
593 secs++; \
594 } \
595 (tv2).tv_sec = secs; \
596 (tv2).tv_usec = usecs; \
597 })
598
599 /* External references. */
600
601 extern struct proto sctp_prot;
602 extern struct proto sctpv6_prot;
603 void sctp_put_port(struct sock *sk);
604
605 extern struct idr sctp_assocs_id;
606 extern spinlock_t sctp_assocs_id_lock;
607
608 /* Static inline functions. */
609
610 /* Convert from an IP version number to an Address Family symbol. */
ipver2af(__u8 ipver)611 static inline int ipver2af(__u8 ipver)
612 {
613 switch (ipver) {
614 case 4:
615 return AF_INET;
616 case 6:
617 return AF_INET6;
618 default:
619 return 0;
620 }
621 }
622
623 /* Convert from an address parameter type to an address family. */
param_type2af(__be16 type)624 static inline int param_type2af(__be16 type)
625 {
626 switch (type) {
627 case SCTP_PARAM_IPV4_ADDRESS:
628 return AF_INET;
629 case SCTP_PARAM_IPV6_ADDRESS:
630 return AF_INET6;
631 default:
632 return 0;
633 }
634 }
635
636 /* Perform some sanity checks. */
sctp_sanity_check(void)637 static inline int sctp_sanity_check(void)
638 {
639 SCTP_ASSERT(sizeof(struct sctp_ulpevent) <=
640 sizeof(((struct sk_buff *)0)->cb),
641 "SCTP: ulpevent does not fit in skb!\n", return 0);
642
643 return 1;
644 }
645
646 /* Warning: The following hash functions assume a power of two 'size'. */
647 /* This is the hash function for the SCTP port hash table. */
sctp_phashfn(struct net * net,__u16 lport)648 static inline int sctp_phashfn(struct net *net, __u16 lport)
649 {
650 return (net_hash_mix(net) + lport) & (sctp_port_hashsize - 1);
651 }
652
653 /* This is the hash function for the endpoint hash table. */
sctp_ep_hashfn(struct net * net,__u16 lport)654 static inline int sctp_ep_hashfn(struct net *net, __u16 lport)
655 {
656 return (net_hash_mix(net) + lport) & (sctp_ep_hashsize - 1);
657 }
658
659 /* This is the hash function for the association hash table. */
sctp_assoc_hashfn(struct net * net,__u16 lport,__u16 rport)660 static inline int sctp_assoc_hashfn(struct net *net, __u16 lport, __u16 rport)
661 {
662 int h = (lport << 16) + rport + net_hash_mix(net);
663 h ^= h>>8;
664 return h & (sctp_assoc_hashsize - 1);
665 }
666
667 /* This is the hash function for the association hash table. This is
668 * not used yet, but could be used as a better hash function when
669 * we have a vtag.
670 */
sctp_vtag_hashfn(__u16 lport,__u16 rport,__u32 vtag)671 static inline int sctp_vtag_hashfn(__u16 lport, __u16 rport, __u32 vtag)
672 {
673 int h = (lport << 16) + rport;
674 h ^= vtag;
675 return h & (sctp_assoc_hashsize - 1);
676 }
677
678 #define sctp_for_each_hentry(epb, head) \
679 hlist_for_each_entry(epb, head, node)
680
681 /* Is a socket of this style? */
682 #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style))
__sctp_style(const struct sock * sk,sctp_socket_type_t style)683 static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style)
684 {
685 return sctp_sk(sk)->type == style;
686 }
687
688 /* Is the association in this state? */
689 #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state))
__sctp_state(const struct sctp_association * asoc,sctp_state_t state)690 static inline int __sctp_state(const struct sctp_association *asoc,
691 sctp_state_t state)
692 {
693 return asoc->state == state;
694 }
695
696 /* Is the socket in this state? */
697 #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state))
__sctp_sstate(const struct sock * sk,sctp_sock_state_t state)698 static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state)
699 {
700 return sk->sk_state == state;
701 }
702
703 /* Map v4-mapped v6 address back to v4 address */
sctp_v6_map_v4(union sctp_addr * addr)704 static inline void sctp_v6_map_v4(union sctp_addr *addr)
705 {
706 addr->v4.sin_family = AF_INET;
707 addr->v4.sin_port = addr->v6.sin6_port;
708 addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3];
709 }
710
711 /* Map v4 address to v4-mapped v6 address */
sctp_v4_map_v6(union sctp_addr * addr)712 static inline void sctp_v4_map_v6(union sctp_addr *addr)
713 {
714 addr->v6.sin6_family = AF_INET6;
715 addr->v6.sin6_port = addr->v4.sin_port;
716 addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
717 addr->v6.sin6_addr.s6_addr32[0] = 0;
718 addr->v6.sin6_addr.s6_addr32[1] = 0;
719 addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff);
720 }
721
722 /* The cookie is always 0 since this is how it's used in the
723 * pmtu code.
724 */
sctp_transport_dst_check(struct sctp_transport * t)725 static inline struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t)
726 {
727 if (t->dst && !dst_check(t->dst, 0)) {
728 dst_release(t->dst);
729 t->dst = NULL;
730 }
731
732 return t->dst;
733 }
734
735 #endif /* __net_sctp_h__ */
736