1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /* SCTP kernel implementation
3 * (C) Copyright IBM Corp. 2001, 2004
4 * Copyright (c) 1999-2000 Cisco, Inc.
5 * Copyright (c) 1999-2001 Motorola, Inc.
6 * Copyright (c) 2001-2003 Intel Corp.
7 *
8 * This file is part of the SCTP kernel implementation
9 *
10 * The base lksctp header.
11 *
12 * Please send any bug reports or fixes you make to the
13 * email address(es):
14 * lksctp developers <linux-sctp@vger.kernel.org>
15 *
16 * Written or modified by:
17 * La Monte H.P. Yarroll <piggy@acm.org>
18 * Xingang Guo <xingang.guo@intel.com>
19 * Jon Grimm <jgrimm@us.ibm.com>
20 * Daisy Chang <daisyc@us.ibm.com>
21 * Sridhar Samudrala <sri@us.ibm.com>
22 * Ardelle Fan <ardelle.fan@intel.com>
23 * Ryan Layer <rmlayer@us.ibm.com>
24 * Kevin Gao <kevin.gao@intel.com>
25 */
26
27 #ifndef __net_sctp_h__
28 #define __net_sctp_h__
29
30 /* Header Strategy.
31 * Start getting some control over the header file depencies:
32 * includes
33 * constants
34 * structs
35 * prototypes
36 * macros, externs, and inlines
37 *
38 * Move test_frame specific items out of the kernel headers
39 * and into the test frame headers. This is not perfect in any sense
40 * and will continue to evolve.
41 */
42
43 #include <linux/types.h>
44 #include <linux/slab.h>
45 #include <linux/in.h>
46 #include <linux/tty.h>
47 #include <linux/proc_fs.h>
48 #include <linux/spinlock.h>
49 #include <linux/jiffies.h>
50 #include <linux/idr.h>
51
52 #if IS_ENABLED(CONFIG_IPV6)
53 #include <net/ipv6.h>
54 #include <net/ip6_route.h>
55 #endif
56
57 #include <linux/uaccess.h>
58 #include <asm/page.h>
59 #include <net/sock.h>
60 #include <net/snmp.h>
61 #include <net/sctp/structs.h>
62 #include <net/sctp/constants.h>
63
64 #ifdef CONFIG_IP_SCTP_MODULE
65 #define SCTP_PROTOSW_FLAG 0
66 #else /* static! */
67 #define SCTP_PROTOSW_FLAG INET_PROTOSW_PERMANENT
68 #endif
69
70 /* Round an int up to the next multiple of 4. */
71 #define SCTP_PAD4(s) (((s)+3)&~3)
72 /* Truncate to the previous multiple of 4. */
73 #define SCTP_TRUNC4(s) ((s)&~3)
74
75 /*
76 * Function declarations.
77 */
78
79 /*
80 * sctp/protocol.c
81 */
82 int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *addr,
83 enum sctp_scope, gfp_t gfp, int flags);
84 struct sctp_pf *sctp_get_pf_specific(sa_family_t family);
85 int sctp_register_pf(struct sctp_pf *, sa_family_t);
86 void sctp_addr_wq_mgmt(struct net *, struct sctp_sockaddr_entry *, int);
87 int sctp_udp_sock_start(struct net *net);
88 void sctp_udp_sock_stop(struct net *net);
89
90 /*
91 * sctp/socket.c
92 */
93 int sctp_inet_connect(struct socket *sock, struct sockaddr *uaddr,
94 int addr_len, int flags);
95 int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb);
96 int sctp_inet_listen(struct socket *sock, int backlog);
97 void sctp_write_space(struct sock *sk);
98 void sctp_data_ready(struct sock *sk);
99 __poll_t sctp_poll(struct file *file, struct socket *sock,
100 poll_table *wait);
101 void sctp_sock_rfree(struct sk_buff *skb);
102 void sctp_copy_sock(struct sock *newsk, struct sock *sk,
103 struct sctp_association *asoc);
104 extern struct percpu_counter sctp_sockets_allocated;
105 int sctp_asconf_mgmt(struct sctp_sock *, struct sctp_sockaddr_entry *);
106 struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int, int *);
107
108 typedef int (*sctp_callback_t)(struct sctp_endpoint *, struct sctp_transport *, void *);
109 void sctp_transport_walk_start(struct rhashtable_iter *iter);
110 void sctp_transport_walk_stop(struct rhashtable_iter *iter);
111 struct sctp_transport *sctp_transport_get_next(struct net *net,
112 struct rhashtable_iter *iter);
113 struct sctp_transport *sctp_transport_get_idx(struct net *net,
114 struct rhashtable_iter *iter, int pos);
115 int sctp_transport_lookup_process(sctp_callback_t cb, struct net *net,
116 const union sctp_addr *laddr,
117 const union sctp_addr *paddr, void *p);
118 int sctp_transport_traverse_process(sctp_callback_t cb, sctp_callback_t cb_done,
119 struct net *net, int *pos, void *p);
120 int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *), void *p);
121 int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc,
122 struct sctp_info *info);
123
124 /*
125 * sctp/primitive.c
126 */
127 int sctp_primitive_ASSOCIATE(struct net *, struct sctp_association *, void *arg);
128 int sctp_primitive_SHUTDOWN(struct net *, struct sctp_association *, void *arg);
129 int sctp_primitive_ABORT(struct net *, struct sctp_association *, void *arg);
130 int sctp_primitive_SEND(struct net *, struct sctp_association *, void *arg);
131 int sctp_primitive_REQUESTHEARTBEAT(struct net *, struct sctp_association *, void *arg);
132 int sctp_primitive_ASCONF(struct net *, struct sctp_association *, void *arg);
133 int sctp_primitive_RECONF(struct net *net, struct sctp_association *asoc,
134 void *arg);
135
136 /*
137 * sctp/input.c
138 */
139 int sctp_rcv(struct sk_buff *skb);
140 int sctp_v4_err(struct sk_buff *skb, u32 info);
141 int sctp_hash_endpoint(struct sctp_endpoint *ep);
142 void sctp_unhash_endpoint(struct sctp_endpoint *);
143 struct sock *sctp_err_lookup(struct net *net, int family, struct sk_buff *,
144 struct sctphdr *, struct sctp_association **,
145 struct sctp_transport **);
146 void sctp_err_finish(struct sock *, struct sctp_transport *);
147 int sctp_udp_v4_err(struct sock *sk, struct sk_buff *skb);
148 int sctp_udp_v6_err(struct sock *sk, struct sk_buff *skb);
149 void sctp_icmp_frag_needed(struct sock *, struct sctp_association *,
150 struct sctp_transport *t, __u32 pmtu);
151 void sctp_icmp_redirect(struct sock *, struct sctp_transport *,
152 struct sk_buff *);
153 void sctp_icmp_proto_unreachable(struct sock *sk,
154 struct sctp_association *asoc,
155 struct sctp_transport *t);
156 void sctp_backlog_migrate(struct sctp_association *assoc,
157 struct sock *oldsk, struct sock *newsk);
158 int sctp_transport_hashtable_init(void);
159 void sctp_transport_hashtable_destroy(void);
160 int sctp_hash_transport(struct sctp_transport *t);
161 void sctp_unhash_transport(struct sctp_transport *t);
162 struct sctp_transport *sctp_addrs_lookup_transport(
163 struct net *net,
164 const union sctp_addr *laddr,
165 const union sctp_addr *paddr);
166 struct sctp_transport *sctp_epaddr_lookup_transport(
167 const struct sctp_endpoint *ep,
168 const union sctp_addr *paddr);
169
170 /*
171 * sctp/proc.c
172 */
173 int __net_init sctp_proc_init(struct net *net);
174
175 /*
176 * sctp/offload.c
177 */
178 int sctp_offload_init(void);
179
180 /*
181 * sctp/stream_sched.c
182 */
183 void sctp_sched_ops_init(void);
184
185 /*
186 * sctp/stream.c
187 */
188 int sctp_send_reset_streams(struct sctp_association *asoc,
189 struct sctp_reset_streams *params);
190 int sctp_send_reset_assoc(struct sctp_association *asoc);
191 int sctp_send_add_streams(struct sctp_association *asoc,
192 struct sctp_add_streams *params);
193
194 /*
195 * Module global variables
196 */
197
198 /*
199 * sctp/protocol.c
200 */
201 extern struct kmem_cache *sctp_chunk_cachep __read_mostly;
202 extern struct kmem_cache *sctp_bucket_cachep __read_mostly;
203 extern long sysctl_sctp_mem[3];
204 extern int sysctl_sctp_rmem[3];
205 extern int sysctl_sctp_wmem[3];
206
207 /*
208 * Section: Macros, externs, and inlines
209 */
210
211 /* SCTP SNMP MIB stats handlers */
212 #define SCTP_INC_STATS(net, field) SNMP_INC_STATS((net)->sctp.sctp_statistics, field)
213 #define __SCTP_INC_STATS(net, field) __SNMP_INC_STATS((net)->sctp.sctp_statistics, field)
214 #define SCTP_DEC_STATS(net, field) SNMP_DEC_STATS((net)->sctp.sctp_statistics, field)
215
216 /* sctp mib definitions */
217 enum {
218 SCTP_MIB_NUM = 0,
219 SCTP_MIB_CURRESTAB, /* CurrEstab */
220 SCTP_MIB_ACTIVEESTABS, /* ActiveEstabs */
221 SCTP_MIB_PASSIVEESTABS, /* PassiveEstabs */
222 SCTP_MIB_ABORTEDS, /* Aborteds */
223 SCTP_MIB_SHUTDOWNS, /* Shutdowns */
224 SCTP_MIB_OUTOFBLUES, /* OutOfBlues */
225 SCTP_MIB_CHECKSUMERRORS, /* ChecksumErrors */
226 SCTP_MIB_OUTCTRLCHUNKS, /* OutCtrlChunks */
227 SCTP_MIB_OUTORDERCHUNKS, /* OutOrderChunks */
228 SCTP_MIB_OUTUNORDERCHUNKS, /* OutUnorderChunks */
229 SCTP_MIB_INCTRLCHUNKS, /* InCtrlChunks */
230 SCTP_MIB_INORDERCHUNKS, /* InOrderChunks */
231 SCTP_MIB_INUNORDERCHUNKS, /* InUnorderChunks */
232 SCTP_MIB_FRAGUSRMSGS, /* FragUsrMsgs */
233 SCTP_MIB_REASMUSRMSGS, /* ReasmUsrMsgs */
234 SCTP_MIB_OUTSCTPPACKS, /* OutSCTPPacks */
235 SCTP_MIB_INSCTPPACKS, /* InSCTPPacks */
236 SCTP_MIB_T1_INIT_EXPIREDS,
237 SCTP_MIB_T1_COOKIE_EXPIREDS,
238 SCTP_MIB_T2_SHUTDOWN_EXPIREDS,
239 SCTP_MIB_T3_RTX_EXPIREDS,
240 SCTP_MIB_T4_RTO_EXPIREDS,
241 SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS,
242 SCTP_MIB_DELAY_SACK_EXPIREDS,
243 SCTP_MIB_AUTOCLOSE_EXPIREDS,
244 SCTP_MIB_T1_RETRANSMITS,
245 SCTP_MIB_T3_RETRANSMITS,
246 SCTP_MIB_PMTUD_RETRANSMITS,
247 SCTP_MIB_FAST_RETRANSMITS,
248 SCTP_MIB_IN_PKT_SOFTIRQ,
249 SCTP_MIB_IN_PKT_BACKLOG,
250 SCTP_MIB_IN_PKT_DISCARDS,
251 SCTP_MIB_IN_DATA_CHUNK_DISCARDS,
252 __SCTP_MIB_MAX
253 };
254
255 #define SCTP_MIB_MAX __SCTP_MIB_MAX
256 struct sctp_mib {
257 unsigned long mibs[SCTP_MIB_MAX];
258 };
259
260 /* helper function to track stats about max rto and related transport */
sctp_max_rto(struct sctp_association * asoc,struct sctp_transport * trans)261 static inline void sctp_max_rto(struct sctp_association *asoc,
262 struct sctp_transport *trans)
263 {
264 if (asoc->stats.max_obs_rto < (__u64)trans->rto) {
265 asoc->stats.max_obs_rto = trans->rto;
266 memset(&asoc->stats.obs_rto_ipaddr, 0,
267 sizeof(struct sockaddr_storage));
268 memcpy(&asoc->stats.obs_rto_ipaddr, &trans->ipaddr,
269 trans->af_specific->sockaddr_len);
270 }
271 }
272
273 /*
274 * Macros for keeping a global reference of object allocations.
275 */
276 #ifdef CONFIG_SCTP_DBG_OBJCNT
277
278 extern atomic_t sctp_dbg_objcnt_sock;
279 extern atomic_t sctp_dbg_objcnt_ep;
280 extern atomic_t sctp_dbg_objcnt_assoc;
281 extern atomic_t sctp_dbg_objcnt_transport;
282 extern atomic_t sctp_dbg_objcnt_chunk;
283 extern atomic_t sctp_dbg_objcnt_bind_addr;
284 extern atomic_t sctp_dbg_objcnt_bind_bucket;
285 extern atomic_t sctp_dbg_objcnt_addr;
286 extern atomic_t sctp_dbg_objcnt_datamsg;
287 extern atomic_t sctp_dbg_objcnt_keys;
288
289 /* Macros to atomically increment/decrement objcnt counters. */
290 #define SCTP_DBG_OBJCNT_INC(name) \
291 atomic_inc(&sctp_dbg_objcnt_## name)
292 #define SCTP_DBG_OBJCNT_DEC(name) \
293 atomic_dec(&sctp_dbg_objcnt_## name)
294 #define SCTP_DBG_OBJCNT(name) \
295 atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0)
296
297 /* Macro to help create new entries in the global array of
298 * objcnt counters.
299 */
300 #define SCTP_DBG_OBJCNT_ENTRY(name) \
301 {.label= #name, .counter= &sctp_dbg_objcnt_## name}
302
303 void sctp_dbg_objcnt_init(struct net *);
304
305 #else
306
307 #define SCTP_DBG_OBJCNT_INC(name)
308 #define SCTP_DBG_OBJCNT_DEC(name)
309
sctp_dbg_objcnt_init(struct net * net)310 static inline void sctp_dbg_objcnt_init(struct net *net) { return; }
311
312 #endif /* CONFIG_SCTP_DBG_OBJCOUNT */
313
314 #if defined CONFIG_SYSCTL
315 void sctp_sysctl_register(void);
316 void sctp_sysctl_unregister(void);
317 int sctp_sysctl_net_register(struct net *net);
318 void sctp_sysctl_net_unregister(struct net *net);
319 #else
sctp_sysctl_register(void)320 static inline void sctp_sysctl_register(void) { return; }
sctp_sysctl_unregister(void)321 static inline void sctp_sysctl_unregister(void) { return; }
sctp_sysctl_net_register(struct net * net)322 static inline int sctp_sysctl_net_register(struct net *net) { return 0; }
sctp_sysctl_net_unregister(struct net * net)323 static inline void sctp_sysctl_net_unregister(struct net *net) { return; }
324 #endif
325
326 /* Size of Supported Address Parameter for 'x' address types. */
327 #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16))
328
329 #if IS_ENABLED(CONFIG_IPV6)
330
331 void sctp_v6_pf_init(void);
332 void sctp_v6_pf_exit(void);
333 int sctp_v6_protosw_init(void);
334 void sctp_v6_protosw_exit(void);
335 int sctp_v6_add_protocol(void);
336 void sctp_v6_del_protocol(void);
337
338 #else /* #ifdef defined(CONFIG_IPV6) */
339
sctp_v6_pf_init(void)340 static inline void sctp_v6_pf_init(void) { return; }
sctp_v6_pf_exit(void)341 static inline void sctp_v6_pf_exit(void) { return; }
sctp_v6_protosw_init(void)342 static inline int sctp_v6_protosw_init(void) { return 0; }
sctp_v6_protosw_exit(void)343 static inline void sctp_v6_protosw_exit(void) { return; }
sctp_v6_add_protocol(void)344 static inline int sctp_v6_add_protocol(void) { return 0; }
sctp_v6_del_protocol(void)345 static inline void sctp_v6_del_protocol(void) { return; }
346
347 #endif /* #if defined(CONFIG_IPV6) */
348
349
350 /* Map an association to an assoc_id. */
sctp_assoc2id(const struct sctp_association * asoc)351 static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc)
352 {
353 return asoc ? asoc->assoc_id : 0;
354 }
355
356 static inline enum sctp_sstat_state
sctp_assoc_to_state(const struct sctp_association * asoc)357 sctp_assoc_to_state(const struct sctp_association *asoc)
358 {
359 /* SCTP's uapi always had SCTP_EMPTY(=0) as a dummy state, but we
360 * got rid of it in kernel space. Therefore SCTP_CLOSED et al
361 * start at =1 in user space, but actually as =0 in kernel space.
362 * Now that we can not break user space and SCTP_EMPTY is exposed
363 * there, we need to fix it up with an ugly offset not to break
364 * applications. :(
365 */
366 return asoc->state + 1;
367 }
368
369 /* Look up the association by its id. */
370 struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id);
371
372 int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp);
373
374 /* A macro to walk a list of skbs. */
375 #define sctp_skb_for_each(pos, head, tmp) \
376 skb_queue_walk_safe(head, pos, tmp)
377
378 /**
379 * sctp_list_dequeue - remove from the head of the queue
380 * @list: list to dequeue from
381 *
382 * Remove the head of the list. The head item is
383 * returned or %NULL if the list is empty.
384 */
385
sctp_list_dequeue(struct list_head * list)386 static inline struct list_head *sctp_list_dequeue(struct list_head *list)
387 {
388 struct list_head *result = NULL;
389
390 if (!list_empty(list)) {
391 result = list->next;
392 list_del_init(result);
393 }
394 return result;
395 }
396
397 /* SCTP version of skb_set_owner_r. We need this one because
398 * of the way we have to do receive buffer accounting on bundled
399 * chunks.
400 */
sctp_skb_set_owner_r(struct sk_buff * skb,struct sock * sk)401 static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk)
402 {
403 struct sctp_ulpevent *event = sctp_skb2event(skb);
404
405 skb_orphan(skb);
406 skb->sk = sk;
407 skb->destructor = sctp_sock_rfree;
408 atomic_add(event->rmem_len, &sk->sk_rmem_alloc);
409 /*
410 * This mimics the behavior of skb_set_owner_r
411 */
412 sk_mem_charge(sk, event->rmem_len);
413 }
414
415 /* Tests if the list has one and only one entry. */
sctp_list_single_entry(struct list_head * head)416 static inline int sctp_list_single_entry(struct list_head *head)
417 {
418 return list_is_singular(head);
419 }
420
sctp_chunk_pending(const struct sctp_chunk * chunk)421 static inline bool sctp_chunk_pending(const struct sctp_chunk *chunk)
422 {
423 return !list_empty(&chunk->list);
424 }
425
426 /* Walk through a list of TLV parameters. Don't trust the
427 * individual parameter lengths and instead depend on
428 * the chunk length to indicate when to stop. Make sure
429 * there is room for a param header too.
430 */
431 #define sctp_walk_params(pos, chunk, member)\
432 _sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length), member)
433
434 #define _sctp_walk_params(pos, chunk, end, member)\
435 for (pos.v = chunk->member;\
436 (pos.v + offsetof(struct sctp_paramhdr, length) + sizeof(pos.p->length) <=\
437 (void *)chunk + end) &&\
438 pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\
439 ntohs(pos.p->length) >= sizeof(struct sctp_paramhdr);\
440 pos.v += SCTP_PAD4(ntohs(pos.p->length)))
441
442 #define sctp_walk_errors(err, chunk_hdr)\
443 _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length))
444
445 #define _sctp_walk_errors(err, chunk_hdr, end)\
446 for (err = (struct sctp_errhdr *)((void *)chunk_hdr + \
447 sizeof(struct sctp_chunkhdr));\
448 ((void *)err + offsetof(struct sctp_errhdr, length) + sizeof(err->length) <=\
449 (void *)chunk_hdr + end) &&\
450 (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\
451 ntohs(err->length) >= sizeof(struct sctp_errhdr); \
452 err = (struct sctp_errhdr *)((void *)err + SCTP_PAD4(ntohs(err->length))))
453
454 #define sctp_walk_fwdtsn(pos, chunk)\
455 _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk))
456
457 #define _sctp_walk_fwdtsn(pos, chunk, end)\
458 for (pos = chunk->subh.fwdtsn_hdr->skip;\
459 (void *)pos <= (void *)chunk->subh.fwdtsn_hdr->skip + end - sizeof(struct sctp_fwdtsn_skip);\
460 pos++)
461
462 /* External references. */
463
464 extern struct proto sctp_prot;
465 extern struct proto sctpv6_prot;
466 void sctp_put_port(struct sock *sk);
467
468 extern struct idr sctp_assocs_id;
469 extern spinlock_t sctp_assocs_id_lock;
470
471 /* Static inline functions. */
472
473 /* Convert from an IP version number to an Address Family symbol. */
ipver2af(__u8 ipver)474 static inline int ipver2af(__u8 ipver)
475 {
476 switch (ipver) {
477 case 4:
478 return AF_INET;
479 case 6:
480 return AF_INET6;
481 default:
482 return 0;
483 }
484 }
485
486 /* Convert from an address parameter type to an address family. */
param_type2af(__be16 type)487 static inline int param_type2af(__be16 type)
488 {
489 switch (type) {
490 case SCTP_PARAM_IPV4_ADDRESS:
491 return AF_INET;
492 case SCTP_PARAM_IPV6_ADDRESS:
493 return AF_INET6;
494 default:
495 return 0;
496 }
497 }
498
499 /* Warning: The following hash functions assume a power of two 'size'. */
500 /* This is the hash function for the SCTP port hash table. */
sctp_phashfn(struct net * net,__u16 lport)501 static inline int sctp_phashfn(struct net *net, __u16 lport)
502 {
503 return (net_hash_mix(net) + lport) & (sctp_port_hashsize - 1);
504 }
505
506 /* This is the hash function for the endpoint hash table. */
sctp_ep_hashfn(struct net * net,__u16 lport)507 static inline int sctp_ep_hashfn(struct net *net, __u16 lport)
508 {
509 return (net_hash_mix(net) + lport) & (sctp_ep_hashsize - 1);
510 }
511
512 #define sctp_for_each_hentry(epb, head) \
513 hlist_for_each_entry(epb, head, node)
514
515 /* Is a socket of this style? */
516 #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style))
__sctp_style(const struct sock * sk,enum sctp_socket_type style)517 static inline int __sctp_style(const struct sock *sk,
518 enum sctp_socket_type style)
519 {
520 return sctp_sk(sk)->type == style;
521 }
522
523 /* Is the association in this state? */
524 #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state))
__sctp_state(const struct sctp_association * asoc,enum sctp_state state)525 static inline int __sctp_state(const struct sctp_association *asoc,
526 enum sctp_state state)
527 {
528 return asoc->state == state;
529 }
530
531 /* Is the socket in this state? */
532 #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state))
__sctp_sstate(const struct sock * sk,enum sctp_sock_state state)533 static inline int __sctp_sstate(const struct sock *sk,
534 enum sctp_sock_state state)
535 {
536 return sk->sk_state == state;
537 }
538
539 /* Map v4-mapped v6 address back to v4 address */
sctp_v6_map_v4(union sctp_addr * addr)540 static inline void sctp_v6_map_v4(union sctp_addr *addr)
541 {
542 addr->v4.sin_family = AF_INET;
543 addr->v4.sin_port = addr->v6.sin6_port;
544 addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3];
545 }
546
547 /* Map v4 address to v4-mapped v6 address */
sctp_v4_map_v6(union sctp_addr * addr)548 static inline void sctp_v4_map_v6(union sctp_addr *addr)
549 {
550 __be16 port;
551
552 port = addr->v4.sin_port;
553 addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
554 addr->v6.sin6_port = port;
555 addr->v6.sin6_family = AF_INET6;
556 addr->v6.sin6_flowinfo = 0;
557 addr->v6.sin6_scope_id = 0;
558 addr->v6.sin6_addr.s6_addr32[0] = 0;
559 addr->v6.sin6_addr.s6_addr32[1] = 0;
560 addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff);
561 }
562
563 /* The cookie is always 0 since this is how it's used in the
564 * pmtu code.
565 */
sctp_transport_dst_check(struct sctp_transport * t)566 static inline struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t)
567 {
568 if (t->dst && !dst_check(t->dst, t->dst_cookie))
569 sctp_transport_dst_release(t);
570
571 return t->dst;
572 }
573
574 /* Calculate max payload size given a MTU, or the total overhead if
575 * given MTU is zero
576 */
__sctp_mtu_payload(const struct sctp_sock * sp,const struct sctp_transport * t,__u32 mtu,__u32 extra)577 static inline __u32 __sctp_mtu_payload(const struct sctp_sock *sp,
578 const struct sctp_transport *t,
579 __u32 mtu, __u32 extra)
580 {
581 __u32 overhead = sizeof(struct sctphdr) + extra;
582
583 if (sp) {
584 overhead += sp->pf->af->net_header_len;
585 if (sp->udp_port && (!t || t->encap_port))
586 overhead += sizeof(struct udphdr);
587 } else {
588 overhead += sizeof(struct ipv6hdr);
589 }
590
591 if (WARN_ON_ONCE(mtu && mtu <= overhead))
592 mtu = overhead;
593
594 return mtu ? mtu - overhead : overhead;
595 }
596
sctp_mtu_payload(const struct sctp_sock * sp,__u32 mtu,__u32 extra)597 static inline __u32 sctp_mtu_payload(const struct sctp_sock *sp,
598 __u32 mtu, __u32 extra)
599 {
600 return __sctp_mtu_payload(sp, NULL, mtu, extra);
601 }
602
sctp_dst_mtu(const struct dst_entry * dst)603 static inline __u32 sctp_dst_mtu(const struct dst_entry *dst)
604 {
605 return SCTP_TRUNC4(max_t(__u32, dst_mtu(dst),
606 SCTP_DEFAULT_MINSEGMENT));
607 }
608
sctp_transport_pmtu_check(struct sctp_transport * t)609 static inline bool sctp_transport_pmtu_check(struct sctp_transport *t)
610 {
611 __u32 pmtu = sctp_dst_mtu(t->dst);
612
613 if (t->pathmtu == pmtu)
614 return true;
615
616 t->pathmtu = pmtu;
617
618 return false;
619 }
620
sctp_min_frag_point(struct sctp_sock * sp,__u16 datasize)621 static inline __u32 sctp_min_frag_point(struct sctp_sock *sp, __u16 datasize)
622 {
623 return sctp_mtu_payload(sp, SCTP_DEFAULT_MINSEGMENT, datasize);
624 }
625
sctp_transport_pl_hlen(struct sctp_transport * t)626 static inline int sctp_transport_pl_hlen(struct sctp_transport *t)
627 {
628 return __sctp_mtu_payload(sctp_sk(t->asoc->base.sk), t, 0, 0) -
629 sizeof(struct sctphdr);
630 }
631
sctp_transport_pl_reset(struct sctp_transport * t)632 static inline void sctp_transport_pl_reset(struct sctp_transport *t)
633 {
634 if (t->probe_interval && (t->param_flags & SPP_PMTUD_ENABLE) &&
635 (t->state == SCTP_ACTIVE || t->state == SCTP_UNKNOWN)) {
636 if (t->pl.state == SCTP_PL_DISABLED) {
637 t->pl.state = SCTP_PL_BASE;
638 t->pl.pmtu = SCTP_BASE_PLPMTU;
639 t->pl.probe_size = SCTP_BASE_PLPMTU;
640 sctp_transport_reset_probe_timer(t);
641 }
642 } else {
643 if (t->pl.state != SCTP_PL_DISABLED) {
644 if (del_timer(&t->probe_timer))
645 sctp_transport_put(t);
646 t->pl.state = SCTP_PL_DISABLED;
647 }
648 }
649 }
650
sctp_transport_pl_update(struct sctp_transport * t)651 static inline void sctp_transport_pl_update(struct sctp_transport *t)
652 {
653 if (t->pl.state == SCTP_PL_DISABLED)
654 return;
655
656 t->pl.state = SCTP_PL_BASE;
657 t->pl.pmtu = SCTP_BASE_PLPMTU;
658 t->pl.probe_size = SCTP_BASE_PLPMTU;
659 sctp_transport_reset_probe_timer(t);
660 }
661
sctp_transport_pl_enabled(struct sctp_transport * t)662 static inline bool sctp_transport_pl_enabled(struct sctp_transport *t)
663 {
664 return t->pl.state != SCTP_PL_DISABLED;
665 }
666
sctp_newsk_ready(const struct sock * sk)667 static inline bool sctp_newsk_ready(const struct sock *sk)
668 {
669 return sock_flag(sk, SOCK_DEAD) || sk->sk_socket;
670 }
671
sctp_sock_set_nodelay(struct sock * sk)672 static inline void sctp_sock_set_nodelay(struct sock *sk)
673 {
674 lock_sock(sk);
675 sctp_sk(sk)->nodelay = true;
676 release_sock(sk);
677 }
678
679 #endif /* __net_sctp_h__ */
680