sctp.h 18.5 KB
Newer Older
1
/* SCTP kernel implementation
Linus Torvalds's avatar
Linus Torvalds committed
2 3 4 5 6
 * (C) Copyright IBM Corp. 2001, 2004
 * Copyright (c) 1999-2000 Cisco, Inc.
 * Copyright (c) 1999-2001 Motorola, Inc.
 * Copyright (c) 2001-2003 Intel Corp.
 *
7
 * This file is part of the SCTP kernel implementation
Linus Torvalds's avatar
Linus Torvalds committed
8 9 10
 *
 * The base lksctp header.
 *
11
 * This SCTP implementation is free software;
Linus Torvalds's avatar
Linus Torvalds committed
12 13 14 15 16
 * you can redistribute it and/or modify it under the terms of
 * the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
17
 * This SCTP implementation is distributed in the hope that it
Linus Torvalds's avatar
Linus Torvalds committed
18 19 20 21 22 23
 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
 *                 ************************
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
24 25
 * along with GNU CC; see the file COPYING.  If not, see
 * <http://www.gnu.org/licenses/>.
Linus Torvalds's avatar
Linus Torvalds committed
26 27 28
 *
 * Please send any bug reports or fixes you make to the
 * email address(es):
29
 *    lksctp developers <linux-sctp@vger.kernel.org>
Linus Torvalds's avatar
Linus Torvalds committed
30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66
 *
 * Written or modified by:
 *    La Monte H.P. Yarroll <piggy@acm.org>
 *    Xingang Guo           <xingang.guo@intel.com>
 *    Jon Grimm             <jgrimm@us.ibm.com>
 *    Daisy Chang           <daisyc@us.ibm.com>
 *    Sridhar Samudrala     <sri@us.ibm.com>
 *    Ardelle Fan           <ardelle.fan@intel.com>
 *    Ryan Layer            <rmlayer@us.ibm.com>
 *    Kevin Gao             <kevin.gao@intel.com> 
 */

#ifndef __net_sctp_h__
#define __net_sctp_h__

/* Header Strategy.
 *    Start getting some control over the header file depencies:
 *       includes
 *       constants
 *       structs
 *       prototypes
 *       macros, externs, and inlines
 *
 *   Move test_frame specific items out of the kernel headers
 *   and into the test frame headers.   This is not perfect in any sense
 *   and will continue to evolve.
 */

#include <linux/types.h>
#include <linux/slab.h>
#include <linux/in.h>
#include <linux/tty.h>
#include <linux/proc_fs.h>
#include <linux/spinlock.h>
#include <linux/jiffies.h>
#include <linux/idr.h>

67
#if IS_ENABLED(CONFIG_IPV6)
Linus Torvalds's avatar
Linus Torvalds committed
68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84
#include <net/ipv6.h>
#include <net/ip6_route.h>
#endif

#include <asm/uaccess.h>
#include <asm/page.h>
#include <net/sock.h>
#include <net/snmp.h>
#include <net/sctp/structs.h>
#include <net/sctp/constants.h>

#ifdef CONFIG_IP_SCTP_MODULE
#define SCTP_PROTOSW_FLAG 0
#else /* static! */
#define SCTP_PROTOSW_FLAG INET_PROTOSW_PERMANENT
#endif

85
/* Round an int up to the next multiple of 4.  */
86
#define SCTP_PAD4(s) (((s)+3)&~3)
87
/* Truncate to the previous multiple of 4.  */
88
#define SCTP_TRUNC4(s) ((s)&~3)
89

Linus Torvalds's avatar
Linus Torvalds committed
90 91 92 93 94 95 96
/*
 * Function declarations.
 */

/*
 * sctp/protocol.c
 */
97 98 99 100 101
int sctp_copy_local_addr_list(struct net *, struct sctp_bind_addr *,
			      sctp_scope_t, gfp_t gfp, int flags);
struct sctp_pf *sctp_get_pf_specific(sa_family_t family);
int sctp_register_pf(struct sctp_pf *, sa_family_t);
void sctp_addr_wq_mgmt(struct net *, struct sctp_sockaddr_entry *, int);
Linus Torvalds's avatar
Linus Torvalds committed
102 103 104 105 106 107 108

/*
 * sctp/socket.c
 */
int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb);
int sctp_inet_listen(struct socket *sock, int backlog);
void sctp_write_space(struct sock *sk);
109
void sctp_data_ready(struct sock *sk);
Linus Torvalds's avatar
Linus Torvalds committed
110 111
unsigned int sctp_poll(struct file *file, struct socket *sock,
		poll_table *wait);
112
void sctp_sock_rfree(struct sk_buff *skb);
113 114
void sctp_copy_sock(struct sock *newsk, struct sock *sk,
		    struct sctp_association *asoc);
115
extern struct percpu_counter sctp_sockets_allocated;
116
int sctp_asconf_mgmt(struct sctp_sock *, struct sctp_sockaddr_entry *);
117
struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int, int *);
Linus Torvalds's avatar
Linus Torvalds committed
118

119 120 121 122 123 124 125 126 127 128 129 130 131
int sctp_transport_walk_start(struct rhashtable_iter *iter);
void sctp_transport_walk_stop(struct rhashtable_iter *iter);
struct sctp_transport *sctp_transport_get_next(struct net *net,
			struct rhashtable_iter *iter);
struct sctp_transport *sctp_transport_get_idx(struct net *net,
			struct rhashtable_iter *iter, int pos);
int sctp_transport_lookup_process(int (*cb)(struct sctp_transport *, void *),
				  struct net *net,
				  const union sctp_addr *laddr,
				  const union sctp_addr *paddr, void *p);
int sctp_for_each_transport(int (*cb)(struct sctp_transport *, void *),
			    struct net *net, int pos, void *p);
int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *), void *p);
132 133 134
int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc,
		       struct sctp_info *info);

Linus Torvalds's avatar
Linus Torvalds committed
135 136 137
/*
 * sctp/primitive.c
 */
138 139 140 141 142 143
int sctp_primitive_ASSOCIATE(struct net *, struct sctp_association *, void *arg);
int sctp_primitive_SHUTDOWN(struct net *, struct sctp_association *, void *arg);
int sctp_primitive_ABORT(struct net *, struct sctp_association *, void *arg);
int sctp_primitive_SEND(struct net *, struct sctp_association *, void *arg);
int sctp_primitive_REQUESTHEARTBEAT(struct net *, struct sctp_association *, void *arg);
int sctp_primitive_ASCONF(struct net *, struct sctp_association *, void *arg);
Linus Torvalds's avatar
Linus Torvalds committed
144 145 146 147 148 149 150 151

/*
 * sctp/input.c
 */
int sctp_rcv(struct sk_buff *skb);
void sctp_v4_err(struct sk_buff *skb, u32 info);
void sctp_hash_endpoint(struct sctp_endpoint *);
void sctp_unhash_endpoint(struct sctp_endpoint *);
152
struct sock *sctp_err_lookup(struct net *net, int family, struct sk_buff *,
153
			     struct sctphdr *, struct sctp_association **,
Linus Torvalds's avatar
Linus Torvalds committed
154
			     struct sctp_transport **);
155
void sctp_err_finish(struct sock *, struct sctp_transport *);
Linus Torvalds's avatar
Linus Torvalds committed
156 157
void sctp_icmp_frag_needed(struct sock *, struct sctp_association *,
			   struct sctp_transport *t, __u32 pmtu);
158 159
void sctp_icmp_redirect(struct sock *, struct sctp_transport *,
			struct sk_buff *);
Linus Torvalds's avatar
Linus Torvalds committed
160 161 162
void sctp_icmp_proto_unreachable(struct sock *sk,
				 struct sctp_association *asoc,
				 struct sctp_transport *t);
163 164
void sctp_backlog_migrate(struct sctp_association *assoc,
			  struct sock *oldsk, struct sock *newsk);
165 166
int sctp_transport_hashtable_init(void);
void sctp_transport_hashtable_destroy(void);
167
int sctp_hash_transport(struct sctp_transport *t);
168 169 170 171 172 173 174 175
void sctp_unhash_transport(struct sctp_transport *t);
struct sctp_transport *sctp_addrs_lookup_transport(
				struct net *net,
				const union sctp_addr *laddr,
				const union sctp_addr *paddr);
struct sctp_transport *sctp_epaddr_lookup_transport(
				const struct sctp_endpoint *ep,
				const union sctp_addr *paddr);
Linus Torvalds's avatar
Linus Torvalds committed
176

Adrian Bunk's avatar
Adrian Bunk committed
177 178 179
/*
 * sctp/proc.c
 */
180 181 182 183 184 185 186 187
int sctp_snmp_proc_init(struct net *net);
void sctp_snmp_proc_exit(struct net *net);
int sctp_eps_proc_init(struct net *net);
void sctp_eps_proc_exit(struct net *net);
int sctp_assocs_proc_init(struct net *net);
void sctp_assocs_proc_exit(struct net *net);
int sctp_remaddr_proc_init(struct net *net);
void sctp_remaddr_proc_exit(struct net *net);
Adrian Bunk's avatar
Adrian Bunk committed
188

189 190 191 192
/*
 * sctp/offload.c
 */
int sctp_offload_init(void);
Adrian Bunk's avatar
Adrian Bunk committed
193

194 195 196 197 198 199 200 201 202
/*
 * Module global variables
 */

 /*
  * sctp/protocol.c
  */
extern struct kmem_cache *sctp_chunk_cachep __read_mostly;
extern struct kmem_cache *sctp_bucket_cachep __read_mostly;
203 204 205
extern long sysctl_sctp_mem[3];
extern int sysctl_sctp_rmem[3];
extern int sysctl_sctp_wmem[3];
206

Linus Torvalds's avatar
Linus Torvalds committed
207 208 209 210 211
/*
 *  Section:  Macros, externs, and inlines
 */

/* SCTP SNMP MIB stats handlers */
Eric Dumazet's avatar
Eric Dumazet committed
212 213 214
#define SCTP_INC_STATS(net, field)	SNMP_INC_STATS((net)->sctp.sctp_statistics, field)
#define __SCTP_INC_STATS(net, field)	__SNMP_INC_STATS((net)->sctp.sctp_statistics, field)
#define SCTP_DEC_STATS(net, field)	SNMP_DEC_STATS((net)->sctp.sctp_statistics, field)
Linus Torvalds's avatar
Linus Torvalds committed
215

216
/* sctp mib definitions */
Eric Dumazet's avatar
Eric Dumazet committed
217
enum {
218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243
	SCTP_MIB_NUM = 0,
	SCTP_MIB_CURRESTAB,			/* CurrEstab */
	SCTP_MIB_ACTIVEESTABS,			/* ActiveEstabs */
	SCTP_MIB_PASSIVEESTABS,			/* PassiveEstabs */
	SCTP_MIB_ABORTEDS,			/* Aborteds */
	SCTP_MIB_SHUTDOWNS,			/* Shutdowns */
	SCTP_MIB_OUTOFBLUES,			/* OutOfBlues */
	SCTP_MIB_CHECKSUMERRORS,		/* ChecksumErrors */
	SCTP_MIB_OUTCTRLCHUNKS,			/* OutCtrlChunks */
	SCTP_MIB_OUTORDERCHUNKS,		/* OutOrderChunks */
	SCTP_MIB_OUTUNORDERCHUNKS,		/* OutUnorderChunks */
	SCTP_MIB_INCTRLCHUNKS,			/* InCtrlChunks */
	SCTP_MIB_INORDERCHUNKS,			/* InOrderChunks */
	SCTP_MIB_INUNORDERCHUNKS,		/* InUnorderChunks */
	SCTP_MIB_FRAGUSRMSGS,			/* FragUsrMsgs */
	SCTP_MIB_REASMUSRMSGS,			/* ReasmUsrMsgs */
	SCTP_MIB_OUTSCTPPACKS,			/* OutSCTPPacks */
	SCTP_MIB_INSCTPPACKS,			/* InSCTPPacks */
	SCTP_MIB_T1_INIT_EXPIREDS,
	SCTP_MIB_T1_COOKIE_EXPIREDS,
	SCTP_MIB_T2_SHUTDOWN_EXPIREDS,
	SCTP_MIB_T3_RTX_EXPIREDS,
	SCTP_MIB_T4_RTO_EXPIREDS,
	SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS,
	SCTP_MIB_DELAY_SACK_EXPIREDS,
	SCTP_MIB_AUTOCLOSE_EXPIREDS,
244
	SCTP_MIB_T1_RETRANSMITS,
245 246 247 248 249 250 251 252 253 254 255 256 257
	SCTP_MIB_T3_RETRANSMITS,
	SCTP_MIB_PMTUD_RETRANSMITS,
	SCTP_MIB_FAST_RETRANSMITS,
	SCTP_MIB_IN_PKT_SOFTIRQ,
	SCTP_MIB_IN_PKT_BACKLOG,
	SCTP_MIB_IN_PKT_DISCARDS,
	SCTP_MIB_IN_DATA_CHUNK_DISCARDS,
	__SCTP_MIB_MAX
};

#define SCTP_MIB_MAX    __SCTP_MIB_MAX
struct sctp_mib {
        unsigned long   mibs[SCTP_MIB_MAX];
Eric Dumazet's avatar
Eric Dumazet committed
258
};
259

260 261 262 263 264 265 266 267 268 269 270 271
/* helper function to track stats about max rto and related transport */
static inline void sctp_max_rto(struct sctp_association *asoc,
				struct sctp_transport *trans)
{
	if (asoc->stats.max_obs_rto < (__u64)trans->rto) {
		asoc->stats.max_obs_rto = trans->rto;
		memset(&asoc->stats.obs_rto_ipaddr, 0,
			sizeof(struct sockaddr_storage));
		memcpy(&asoc->stats.obs_rto_ipaddr, &trans->ipaddr,
			trans->af_specific->sockaddr_len);
	}
}
Linus Torvalds's avatar
Linus Torvalds committed
272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287

/*
 * Macros for keeping a global reference of object allocations.
 */
#ifdef CONFIG_SCTP_DBG_OBJCNT

extern atomic_t sctp_dbg_objcnt_sock;
extern atomic_t sctp_dbg_objcnt_ep;
extern atomic_t sctp_dbg_objcnt_assoc;
extern atomic_t sctp_dbg_objcnt_transport;
extern atomic_t sctp_dbg_objcnt_chunk;
extern atomic_t sctp_dbg_objcnt_bind_addr;
extern atomic_t sctp_dbg_objcnt_bind_bucket;
extern atomic_t sctp_dbg_objcnt_addr;
extern atomic_t sctp_dbg_objcnt_ssnmap;
extern atomic_t sctp_dbg_objcnt_datamsg;
288
extern atomic_t sctp_dbg_objcnt_keys;
Linus Torvalds's avatar
Linus Torvalds committed
289 290 291 292 293 294 295 296 297 298 299 300 301 302 303

/* Macros to atomically increment/decrement objcnt counters.  */
#define SCTP_DBG_OBJCNT_INC(name) \
atomic_inc(&sctp_dbg_objcnt_## name)
#define SCTP_DBG_OBJCNT_DEC(name) \
atomic_dec(&sctp_dbg_objcnt_## name)
#define SCTP_DBG_OBJCNT(name) \
atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0)

/* Macro to help create new entries in in the global array of
 * objcnt counters.
 */
#define SCTP_DBG_OBJCNT_ENTRY(name) \
{.label= #name, .counter= &sctp_dbg_objcnt_## name}

304 305
void sctp_dbg_objcnt_init(struct net *);
void sctp_dbg_objcnt_exit(struct net *);
Linus Torvalds's avatar
Linus Torvalds committed
306 307 308 309 310 311

#else

#define SCTP_DBG_OBJCNT_INC(name)
#define SCTP_DBG_OBJCNT_DEC(name)

312 313
static inline void sctp_dbg_objcnt_init(struct net *net) { return; }
static inline void sctp_dbg_objcnt_exit(struct net *net) { return; }
Linus Torvalds's avatar
Linus Torvalds committed
314 315 316 317 318 319

#endif /* CONFIG_SCTP_DBG_OBJCOUNT */

#if defined CONFIG_SYSCTL
void sctp_sysctl_register(void);
void sctp_sysctl_unregister(void);
320 321
int sctp_sysctl_net_register(struct net *net);
void sctp_sysctl_net_unregister(struct net *net);
Linus Torvalds's avatar
Linus Torvalds committed
322 323 324
#else
static inline void sctp_sysctl_register(void) { return; }
static inline void sctp_sysctl_unregister(void) { return; }
325 326
static inline int sctp_sysctl_net_register(struct net *net) { return 0; }
static inline void sctp_sysctl_net_unregister(struct net *net) { return; }
Linus Torvalds's avatar
Linus Torvalds committed
327 328 329 330 331
#endif

/* Size of Supported Address Parameter for 'x' address types. */
#define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16))

332
#if IS_ENABLED(CONFIG_IPV6)
Linus Torvalds's avatar
Linus Torvalds committed
333

334 335 336 337
void sctp_v6_pf_init(void);
void sctp_v6_pf_exit(void);
int sctp_v6_protosw_init(void);
void sctp_v6_protosw_exit(void);
338 339
int sctp_v6_add_protocol(void);
void sctp_v6_del_protocol(void);
Linus Torvalds's avatar
Linus Torvalds committed
340 341 342

#else /* #ifdef defined(CONFIG_IPV6) */

343
static inline void sctp_v6_pf_init(void) { return; }
344 345 346
static inline void sctp_v6_pf_exit(void) { return; }
static inline int sctp_v6_protosw_init(void) { return 0; }
static inline void sctp_v6_protosw_exit(void) { return; }
347 348
static inline int sctp_v6_add_protocol(void) { return 0; }
static inline void sctp_v6_del_protocol(void) { return; }
Linus Torvalds's avatar
Linus Torvalds committed
349 350 351 352 353 354 355

#endif /* #if defined(CONFIG_IPV6) */


/* Map an association to an assoc_id. */
static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc)
{
Eric Dumazet's avatar
Eric Dumazet committed
356
	return asoc ? asoc->assoc_id : 0;
Linus Torvalds's avatar
Linus Torvalds committed
357 358
}

359 360 361 362 363 364 365 366 367 368 369 370 371
static inline enum sctp_sstat_state
sctp_assoc_to_state(const struct sctp_association *asoc)
{
	/* SCTP's uapi always had SCTP_EMPTY(=0) as a dummy state, but we
	 * got rid of it in kernel space. Therefore SCTP_CLOSED et al
	 * start at =1 in user space, but actually as =0 in kernel space.
	 * Now that we can not break user space and SCTP_EMPTY is exposed
	 * there, we need to fix it up with an ugly offset not to break
	 * applications. :(
	 */
	return asoc->state + 1;
}

Linus Torvalds's avatar
Linus Torvalds committed
372 373 374
/* Look up the association by its id.  */
struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id);

375
int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp);
Linus Torvalds's avatar
Linus Torvalds committed
376 377 378

/* A macro to walk a list of skbs.  */
#define sctp_skb_for_each(pos, head, tmp) \
379
	skb_queue_walk_safe(head, pos, tmp)
Linus Torvalds's avatar
Linus Torvalds committed
380 381 382 383 384 385 386 387 388 389 390 391 392

/**
 *	sctp_list_dequeue - remove from the head of the queue
 *	@list: list to dequeue from
 *
 *	Remove the head of the list. The head item is
 *	returned or %NULL if the list is empty.
 */

static inline struct list_head *sctp_list_dequeue(struct list_head *list)
{
	struct list_head *result = NULL;

393
	if (!list_empty(list)) {
Linus Torvalds's avatar
Linus Torvalds committed
394
		result = list->next;
395
		list_del_init(result);
Linus Torvalds's avatar
Linus Torvalds committed
396 397 398 399
	}
	return result;
}

400 401 402 403 404 405 406 407
/* SCTP version of skb_set_owner_r.  We need this one because
 * of the way we have to do receive buffer accounting on bundled
 * chunks.
 */
static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk)
{
	struct sctp_ulpevent *event = sctp_skb2event(skb);

408
	skb_orphan(skb);
409 410 411
	skb->sk = sk;
	skb->destructor = sctp_sock_rfree;
	atomic_add(event->rmem_len, &sk->sk_rmem_alloc);
412
	/*
413
	 * This mimics the behavior of skb_set_owner_r
414 415
	 */
	sk->sk_forward_alloc -= event->rmem_len;
416 417
}

Linus Torvalds's avatar
Linus Torvalds committed
418 419 420
/* Tests if the list has one and only one entry. */
static inline int sctp_list_single_entry(struct list_head *head)
{
Eric Dumazet's avatar
Eric Dumazet committed
421
	return (head->next != head) && (head->next == head->prev);
Linus Torvalds's avatar
Linus Torvalds committed
422 423 424
}

/* Break down data chunks at this point.  */
425
static inline int sctp_frag_point(const struct sctp_association *asoc, int pmtu)
Linus Torvalds's avatar
Linus Torvalds committed
426
{
427
	struct sctp_sock *sp = sctp_sk(asoc->base.sk);
Linus Torvalds's avatar
Linus Torvalds committed
428 429 430 431 432
	int frag = pmtu;

	frag -= sp->pf->af->net_header_len;
	frag -= sizeof(struct sctphdr) + sizeof(struct sctp_data_chunk);

433 434
	if (asoc->user_frag)
		frag = min_t(int, frag, asoc->user_frag);
Linus Torvalds's avatar
Linus Torvalds committed
435

436
	frag = SCTP_TRUNC4(min_t(int, frag, SCTP_MAX_CHUNK_LEN));
Linus Torvalds's avatar
Linus Torvalds committed
437 438 439 440

	return frag;
}

441
static inline void sctp_assoc_pending_pmtu(struct sock *sk, struct sctp_association *asoc)
442 443
{

444
	sctp_assoc_sync_pmtu(sk, asoc);
445 446 447
	asoc->pmtu_pending = 0;
}

448 449 450 451 452
static inline bool sctp_chunk_pending(const struct sctp_chunk *chunk)
{
	return !list_empty(&chunk->list);
}

Linus Torvalds's avatar
Linus Torvalds committed
453 454 455 456 457 458
/* Walk through a list of TLV parameters.  Don't trust the
 * individual parameter lengths and instead depend on
 * the chunk length to indicate when to stop.  Make sure
 * there is room for a param header too.
 */
#define sctp_walk_params(pos, chunk, member)\
459
_sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member)
Linus Torvalds's avatar
Linus Torvalds committed
460 461 462

#define _sctp_walk_params(pos, chunk, end, member)\
for (pos.v = chunk->member;\
463
     pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\
Linus Torvalds's avatar
Linus Torvalds committed
464
     ntohs(pos.p->length) >= sizeof(sctp_paramhdr_t);\
465
     pos.v += SCTP_PAD4(ntohs(pos.p->length)))
Linus Torvalds's avatar
Linus Torvalds committed
466 467 468 469 470 471 472

#define sctp_walk_errors(err, chunk_hdr)\
_sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length))

#define _sctp_walk_errors(err, chunk_hdr, end)\
for (err = (sctp_errhdr_t *)((void *)chunk_hdr + \
	    sizeof(sctp_chunkhdr_t));\
473
     (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\
Linus Torvalds's avatar
Linus Torvalds committed
474
     ntohs(err->length) >= sizeof(sctp_errhdr_t); \
475
     err = (sctp_errhdr_t *)((void *)err + SCTP_PAD4(ntohs(err->length))))
Linus Torvalds's avatar
Linus Torvalds committed
476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505

#define sctp_walk_fwdtsn(pos, chunk)\
_sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk))

#define _sctp_walk_fwdtsn(pos, chunk, end)\
for (pos = chunk->subh.fwdtsn_hdr->skip;\
     (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\
     pos++)

/* External references. */

extern struct proto sctp_prot;
extern struct proto sctpv6_prot;
void sctp_put_port(struct sock *sk);

extern struct idr sctp_assocs_id;
extern spinlock_t sctp_assocs_id_lock;

/* Static inline functions. */

/* Convert from an IP version number to an Address Family symbol.  */
static inline int ipver2af(__u8 ipver)
{
	switch (ipver) {
	case 4:
	        return  AF_INET;
	case 6:
		return AF_INET6;
	default:
		return 0;
506
	}
Linus Torvalds's avatar
Linus Torvalds committed
507 508 509
}

/* Convert from an address parameter type to an address family.  */
510
static inline int param_type2af(__be16 type)
Linus Torvalds's avatar
Linus Torvalds committed
511 512 513 514 515 516 517 518
{
	switch (type) {
	case SCTP_PARAM_IPV4_ADDRESS:
	        return  AF_INET;
	case SCTP_PARAM_IPV6_ADDRESS:
		return AF_INET6;
	default:
		return 0;
519
	}
Linus Torvalds's avatar
Linus Torvalds committed
520 521 522 523
}

/* Warning: The following hash functions assume a power of two 'size'. */
/* This is the hash function for the SCTP port hash table. */
524
static inline int sctp_phashfn(struct net *net, __u16 lport)
Linus Torvalds's avatar
Linus Torvalds committed
525
{
526
	return (net_hash_mix(net) + lport) & (sctp_port_hashsize - 1);
Linus Torvalds's avatar
Linus Torvalds committed
527 528 529
}

/* This is the hash function for the endpoint hash table. */
530
static inline int sctp_ep_hashfn(struct net *net, __u16 lport)
Linus Torvalds's avatar
Linus Torvalds committed
531
{
532
	return (net_hash_mix(net) + lport) & (sctp_ep_hashsize - 1);
Linus Torvalds's avatar
Linus Torvalds committed
533 534
}

535 536
#define sctp_for_each_hentry(epb, head) \
	hlist_for_each_entry(epb, head, node)
537

Linus Torvalds's avatar
Linus Torvalds committed
538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570
/* Is a socket of this style? */
#define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style))
static inline int __sctp_style(const struct sock *sk, sctp_socket_type_t style)
{
	return sctp_sk(sk)->type == style;
}

/* Is the association in this state? */
#define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state))
static inline int __sctp_state(const struct sctp_association *asoc,
			       sctp_state_t state)
{
	return asoc->state == state;
}

/* Is the socket in this state? */
#define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state))
static inline int __sctp_sstate(const struct sock *sk, sctp_sock_state_t state)
{
	return sk->sk_state == state;
}

/* Map v4-mapped v6 address back to v4 address */
static inline void sctp_v6_map_v4(union sctp_addr *addr)
{
	addr->v4.sin_family = AF_INET;
	addr->v4.sin_port = addr->v6.sin6_port;
	addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3];
}

/* Map v4 address to v4-mapped v6 address */
static inline void sctp_v4_map_v6(union sctp_addr *addr)
{
571 572 573 574 575
	__be16 port;

	port = addr->v4.sin_port;
	addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
	addr->v6.sin6_port = port;
Linus Torvalds's avatar
Linus Torvalds committed
576
	addr->v6.sin6_family = AF_INET6;
577 578
	addr->v6.sin6_flowinfo = 0;
	addr->v6.sin6_scope_id = 0;
Linus Torvalds's avatar
Linus Torvalds committed
579 580 581 582 583
	addr->v6.sin6_addr.s6_addr32[0] = 0;
	addr->v6.sin6_addr.s6_addr32[1] = 0;
	addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff);
}

584 585 586 587 588
/* The cookie is always 0 since this is how it's used in the
 * pmtu code.
 */
static inline struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t)
{
589
	if (t->dst && !dst_check(t->dst, t->dst_cookie)) {
590 591 592 593 594 595 596
		dst_release(t->dst);
		t->dst = NULL;
	}

	return t->dst;
}

Linus Torvalds's avatar
Linus Torvalds committed
597
#endif /* __net_sctp_h__ */