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 | /* |
71 | * Function declarations. |
72 | */ |
73 | |
74 | /* |
75 | * sctp/protocol.c |
76 | */ |
77 | int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *addr, |
78 | enum sctp_scope, gfp_t gfp, int flags); |
79 | struct sctp_pf *sctp_get_pf_specific(sa_family_t family); |
80 | int sctp_register_pf(struct sctp_pf *, sa_family_t); |
81 | void sctp_addr_wq_mgmt(struct net *, struct sctp_sockaddr_entry *, int); |
82 | int sctp_udp_sock_start(struct net *net); |
83 | void sctp_udp_sock_stop(struct net *net); |
84 | |
85 | /* |
86 | * sctp/socket.c |
87 | */ |
88 | int sctp_inet_connect(struct socket *sock, struct sockaddr *uaddr, |
89 | int addr_len, int flags); |
90 | int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb); |
91 | int sctp_inet_listen(struct socket *sock, int backlog); |
92 | void sctp_write_space(struct sock *sk); |
93 | void sctp_data_ready(struct sock *sk); |
94 | __poll_t sctp_poll(struct file *file, struct socket *sock, |
95 | poll_table *wait); |
96 | void sctp_sock_rfree(struct sk_buff *skb); |
97 | void sctp_copy_sock(struct sock *newsk, struct sock *sk, |
98 | struct sctp_association *asoc); |
99 | extern struct percpu_counter sctp_sockets_allocated; |
100 | int sctp_asconf_mgmt(struct sctp_sock *, struct sctp_sockaddr_entry *); |
101 | struct sk_buff *sctp_skb_recv_datagram(struct sock *, int, int *); |
102 | |
103 | typedef int (*sctp_callback_t)(struct sctp_endpoint *, struct sctp_transport *, void *); |
104 | void sctp_transport_walk_start(struct rhashtable_iter *iter); |
105 | void sctp_transport_walk_stop(struct rhashtable_iter *iter); |
106 | struct sctp_transport *sctp_transport_get_next(struct net *net, |
107 | struct rhashtable_iter *iter); |
108 | struct sctp_transport *sctp_transport_get_idx(struct net *net, |
109 | struct rhashtable_iter *iter, int pos); |
110 | int sctp_transport_lookup_process(sctp_callback_t cb, struct net *net, |
111 | const union sctp_addr *laddr, |
112 | const union sctp_addr *paddr, void *p, int dif); |
113 | int sctp_transport_traverse_process(sctp_callback_t cb, sctp_callback_t cb_done, |
114 | struct net *net, int *pos, void *p); |
115 | int sctp_for_each_endpoint(int (*cb)(struct sctp_endpoint *, void *), void *p); |
116 | int sctp_get_sctp_info(struct sock *sk, struct sctp_association *asoc, |
117 | struct sctp_info *info); |
118 | |
119 | /* |
120 | * sctp/primitive.c |
121 | */ |
122 | int sctp_primitive_ASSOCIATE(struct net *, struct sctp_association *, void *arg); |
123 | int sctp_primitive_SHUTDOWN(struct net *, struct sctp_association *, void *arg); |
124 | int sctp_primitive_ABORT(struct net *, struct sctp_association *, void *arg); |
125 | int sctp_primitive_SEND(struct net *, struct sctp_association *, void *arg); |
126 | int sctp_primitive_REQUESTHEARTBEAT(struct net *, struct sctp_association *, void *arg); |
127 | int sctp_primitive_ASCONF(struct net *, struct sctp_association *, void *arg); |
128 | int sctp_primitive_RECONF(struct net *net, struct sctp_association *asoc, |
129 | void *arg); |
130 | |
131 | /* |
132 | * sctp/input.c |
133 | */ |
134 | int sctp_rcv(struct sk_buff *skb); |
135 | int sctp_v4_err(struct sk_buff *skb, u32 info); |
136 | int sctp_hash_endpoint(struct sctp_endpoint *ep); |
137 | void sctp_unhash_endpoint(struct sctp_endpoint *); |
138 | struct sock *sctp_err_lookup(struct net *net, int family, struct sk_buff *, |
139 | struct sctphdr *, struct sctp_association **, |
140 | struct sctp_transport **); |
141 | void sctp_err_finish(struct sock *, struct sctp_transport *); |
142 | int sctp_udp_v4_err(struct sock *sk, struct sk_buff *skb); |
143 | int sctp_udp_v6_err(struct sock *sk, struct sk_buff *skb); |
144 | void sctp_icmp_frag_needed(struct sock *, struct sctp_association *, |
145 | struct sctp_transport *t, __u32 pmtu); |
146 | void sctp_icmp_redirect(struct sock *, struct sctp_transport *, |
147 | struct sk_buff *); |
148 | void sctp_icmp_proto_unreachable(struct sock *sk, |
149 | struct sctp_association *asoc, |
150 | struct sctp_transport *t); |
151 | int sctp_transport_hashtable_init(void); |
152 | void sctp_transport_hashtable_destroy(void); |
153 | int sctp_hash_transport(struct sctp_transport *t); |
154 | void sctp_unhash_transport(struct sctp_transport *t); |
155 | struct sctp_transport *sctp_addrs_lookup_transport( |
156 | struct net *net, |
157 | const union sctp_addr *laddr, |
158 | const union sctp_addr *paddr, |
159 | int dif, int sdif); |
160 | struct sctp_transport *sctp_epaddr_lookup_transport( |
161 | const struct sctp_endpoint *ep, |
162 | const union sctp_addr *paddr); |
163 | bool sctp_sk_bound_dev_eq(struct net *net, int bound_dev_if, int dif, int sdif); |
164 | |
165 | /* |
166 | * sctp/proc.c |
167 | */ |
168 | int __net_init sctp_proc_init(struct net *net); |
169 | |
170 | /* |
171 | * sctp/offload.c |
172 | */ |
173 | int sctp_offload_init(void); |
174 | |
175 | /* |
176 | * sctp/stream_sched.c |
177 | */ |
178 | void sctp_sched_ops_init(void); |
179 | |
180 | /* |
181 | * sctp/stream.c |
182 | */ |
183 | int sctp_send_reset_streams(struct sctp_association *asoc, |
184 | struct sctp_reset_streams *params); |
185 | int sctp_send_reset_assoc(struct sctp_association *asoc); |
186 | int sctp_send_add_streams(struct sctp_association *asoc, |
187 | struct sctp_add_streams *params); |
188 | |
189 | /* |
190 | * Module global variables |
191 | */ |
192 | |
193 | /* |
194 | * sctp/protocol.c |
195 | */ |
196 | extern struct kmem_cache *sctp_chunk_cachep __read_mostly; |
197 | extern struct kmem_cache *sctp_bucket_cachep __read_mostly; |
198 | extern long sysctl_sctp_mem[3]; |
199 | extern int sysctl_sctp_rmem[3]; |
200 | extern int sysctl_sctp_wmem[3]; |
201 | |
202 | /* |
203 | * Section: Macros, externs, and inlines |
204 | */ |
205 | |
206 | /* SCTP SNMP MIB stats handlers */ |
207 | #define SCTP_INC_STATS(net, field) SNMP_INC_STATS((net)->sctp.sctp_statistics, field) |
208 | #define __SCTP_INC_STATS(net, field) __SNMP_INC_STATS((net)->sctp.sctp_statistics, field) |
209 | #define SCTP_DEC_STATS(net, field) SNMP_DEC_STATS((net)->sctp.sctp_statistics, field) |
210 | |
211 | /* sctp mib definitions */ |
212 | enum { |
213 | SCTP_MIB_NUM = 0, |
214 | SCTP_MIB_CURRESTAB, /* CurrEstab */ |
215 | SCTP_MIB_ACTIVEESTABS, /* ActiveEstabs */ |
216 | SCTP_MIB_PASSIVEESTABS, /* PassiveEstabs */ |
217 | SCTP_MIB_ABORTEDS, /* Aborteds */ |
218 | SCTP_MIB_SHUTDOWNS, /* Shutdowns */ |
219 | SCTP_MIB_OUTOFBLUES, /* OutOfBlues */ |
220 | SCTP_MIB_CHECKSUMERRORS, /* ChecksumErrors */ |
221 | SCTP_MIB_OUTCTRLCHUNKS, /* OutCtrlChunks */ |
222 | SCTP_MIB_OUTORDERCHUNKS, /* OutOrderChunks */ |
223 | SCTP_MIB_OUTUNORDERCHUNKS, /* OutUnorderChunks */ |
224 | SCTP_MIB_INCTRLCHUNKS, /* InCtrlChunks */ |
225 | SCTP_MIB_INORDERCHUNKS, /* InOrderChunks */ |
226 | SCTP_MIB_INUNORDERCHUNKS, /* InUnorderChunks */ |
227 | SCTP_MIB_FRAGUSRMSGS, /* FragUsrMsgs */ |
228 | SCTP_MIB_REASMUSRMSGS, /* ReasmUsrMsgs */ |
229 | SCTP_MIB_OUTSCTPPACKS, /* OutSCTPPacks */ |
230 | SCTP_MIB_INSCTPPACKS, /* InSCTPPacks */ |
231 | SCTP_MIB_T1_INIT_EXPIREDS, |
232 | SCTP_MIB_T1_COOKIE_EXPIREDS, |
233 | SCTP_MIB_T2_SHUTDOWN_EXPIREDS, |
234 | SCTP_MIB_T3_RTX_EXPIREDS, |
235 | SCTP_MIB_T4_RTO_EXPIREDS, |
236 | SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS, |
237 | SCTP_MIB_DELAY_SACK_EXPIREDS, |
238 | SCTP_MIB_AUTOCLOSE_EXPIREDS, |
239 | SCTP_MIB_T1_RETRANSMITS, |
240 | SCTP_MIB_T3_RETRANSMITS, |
241 | SCTP_MIB_PMTUD_RETRANSMITS, |
242 | SCTP_MIB_FAST_RETRANSMITS, |
243 | SCTP_MIB_IN_PKT_SOFTIRQ, |
244 | SCTP_MIB_IN_PKT_BACKLOG, |
245 | SCTP_MIB_IN_PKT_DISCARDS, |
246 | SCTP_MIB_IN_DATA_CHUNK_DISCARDS, |
247 | __SCTP_MIB_MAX |
248 | }; |
249 | |
250 | #define SCTP_MIB_MAX __SCTP_MIB_MAX |
251 | struct sctp_mib { |
252 | unsigned long mibs[SCTP_MIB_MAX]; |
253 | }; |
254 | |
255 | /* helper function to track stats about max rto and related transport */ |
256 | static inline void sctp_max_rto(struct sctp_association *asoc, |
257 | struct sctp_transport *trans) |
258 | { |
259 | if (asoc->stats.max_obs_rto < (__u64)trans->rto) { |
260 | asoc->stats.max_obs_rto = trans->rto; |
261 | memset(&asoc->stats.obs_rto_ipaddr, 0, |
262 | sizeof(struct sockaddr_storage)); |
263 | memcpy(&asoc->stats.obs_rto_ipaddr, &trans->ipaddr, |
264 | trans->af_specific->sockaddr_len); |
265 | } |
266 | } |
267 | |
268 | /* |
269 | * Macros for keeping a global reference of object allocations. |
270 | */ |
271 | #ifdef CONFIG_SCTP_DBG_OBJCNT |
272 | |
273 | extern atomic_t sctp_dbg_objcnt_sock; |
274 | extern atomic_t sctp_dbg_objcnt_ep; |
275 | extern atomic_t sctp_dbg_objcnt_assoc; |
276 | extern atomic_t sctp_dbg_objcnt_transport; |
277 | extern atomic_t sctp_dbg_objcnt_chunk; |
278 | extern atomic_t sctp_dbg_objcnt_bind_addr; |
279 | extern atomic_t sctp_dbg_objcnt_bind_bucket; |
280 | extern atomic_t sctp_dbg_objcnt_addr; |
281 | extern atomic_t sctp_dbg_objcnt_datamsg; |
282 | extern atomic_t sctp_dbg_objcnt_keys; |
283 | |
284 | /* Macros to atomically increment/decrement objcnt counters. */ |
285 | #define SCTP_DBG_OBJCNT_INC(name) \ |
286 | atomic_inc(&sctp_dbg_objcnt_## name) |
287 | #define SCTP_DBG_OBJCNT_DEC(name) \ |
288 | atomic_dec(&sctp_dbg_objcnt_## name) |
289 | #define SCTP_DBG_OBJCNT(name) \ |
290 | atomic_t sctp_dbg_objcnt_## name = ATOMIC_INIT(0) |
291 | |
292 | /* Macro to help create new entries in the global array of |
293 | * objcnt counters. |
294 | */ |
295 | #define SCTP_DBG_OBJCNT_ENTRY(name) \ |
296 | {.label= #name, .counter= &sctp_dbg_objcnt_## name} |
297 | |
298 | void sctp_dbg_objcnt_init(struct net *); |
299 | |
300 | #else |
301 | |
302 | #define SCTP_DBG_OBJCNT_INC(name) |
303 | #define SCTP_DBG_OBJCNT_DEC(name) |
304 | |
305 | static inline void sctp_dbg_objcnt_init(struct net *net) { return; } |
306 | |
307 | #endif /* CONFIG_SCTP_DBG_OBJCOUNT */ |
308 | |
309 | #if defined CONFIG_SYSCTL |
310 | void sctp_sysctl_register(void); |
311 | void sctp_sysctl_unregister(void); |
312 | int sctp_sysctl_net_register(struct net *net); |
313 | void sctp_sysctl_net_unregister(struct net *net); |
314 | #else |
315 | static inline void sctp_sysctl_register(void) { return; } |
316 | static inline void sctp_sysctl_unregister(void) { return; } |
317 | static inline int sctp_sysctl_net_register(struct net *net) { return 0; } |
318 | static inline void sctp_sysctl_net_unregister(struct net *net) { return; } |
319 | #endif |
320 | |
321 | /* Size of Supported Address Parameter for 'x' address types. */ |
322 | #define SCTP_SAT_LEN(x) (sizeof(struct sctp_paramhdr) + (x) * sizeof(__u16)) |
323 | |
324 | #if IS_ENABLED(CONFIG_IPV6) |
325 | |
326 | void sctp_v6_pf_init(void); |
327 | void sctp_v6_pf_exit(void); |
328 | int sctp_v6_protosw_init(void); |
329 | void sctp_v6_protosw_exit(void); |
330 | int sctp_v6_add_protocol(void); |
331 | void sctp_v6_del_protocol(void); |
332 | |
333 | #else /* #ifdef defined(CONFIG_IPV6) */ |
334 | |
335 | static inline void sctp_v6_pf_init(void) { return; } |
336 | static inline void sctp_v6_pf_exit(void) { return; } |
337 | static inline int sctp_v6_protosw_init(void) { return 0; } |
338 | static inline void sctp_v6_protosw_exit(void) { return; } |
339 | static inline int sctp_v6_add_protocol(void) { return 0; } |
340 | static inline void sctp_v6_del_protocol(void) { return; } |
341 | |
342 | #endif /* #if defined(CONFIG_IPV6) */ |
343 | |
344 | |
345 | /* Map an association to an assoc_id. */ |
346 | static inline sctp_assoc_t sctp_assoc2id(const struct sctp_association *asoc) |
347 | { |
348 | return asoc ? asoc->assoc_id : 0; |
349 | } |
350 | |
351 | static inline enum sctp_sstat_state |
352 | sctp_assoc_to_state(const struct sctp_association *asoc) |
353 | { |
354 | /* SCTP's uapi always had SCTP_EMPTY(=0) as a dummy state, but we |
355 | * got rid of it in kernel space. Therefore SCTP_CLOSED et al |
356 | * start at =1 in user space, but actually as =0 in kernel space. |
357 | * Now that we can not break user space and SCTP_EMPTY is exposed |
358 | * there, we need to fix it up with an ugly offset not to break |
359 | * applications. :( |
360 | */ |
361 | return asoc->state + 1; |
362 | } |
363 | |
364 | /* Look up the association by its id. */ |
365 | struct sctp_association *sctp_id2assoc(struct sock *sk, sctp_assoc_t id); |
366 | |
367 | int sctp_do_peeloff(struct sock *sk, sctp_assoc_t id, struct socket **sockp); |
368 | |
369 | /* A macro to walk a list of skbs. */ |
370 | #define sctp_skb_for_each(pos, head, tmp) \ |
371 | skb_queue_walk_safe(head, pos, tmp) |
372 | |
373 | /** |
374 | * sctp_list_dequeue - remove from the head of the queue |
375 | * @list: list to dequeue from |
376 | * |
377 | * Remove the head of the list. The head item is |
378 | * returned or %NULL if the list is empty. |
379 | */ |
380 | |
381 | static inline struct list_head *sctp_list_dequeue(struct list_head *list) |
382 | { |
383 | struct list_head *result = NULL; |
384 | |
385 | if (!list_empty(head: list)) { |
386 | result = list->next; |
387 | list_del_init(entry: result); |
388 | } |
389 | return result; |
390 | } |
391 | |
392 | /* SCTP version of skb_set_owner_r. We need this one because |
393 | * of the way we have to do receive buffer accounting on bundled |
394 | * chunks. |
395 | */ |
396 | static inline void sctp_skb_set_owner_r(struct sk_buff *skb, struct sock *sk) |
397 | { |
398 | struct sctp_ulpevent *event = sctp_skb2event(skb); |
399 | |
400 | skb_orphan(skb); |
401 | skb->sk = sk; |
402 | skb->destructor = sctp_sock_rfree; |
403 | atomic_add(i: event->rmem_len, v: &sk->sk_rmem_alloc); |
404 | /* |
405 | * This mimics the behavior of skb_set_owner_r |
406 | */ |
407 | sk_mem_charge(sk, size: event->rmem_len); |
408 | } |
409 | |
410 | /* Tests if the list has one and only one entry. */ |
411 | static inline int sctp_list_single_entry(struct list_head *head) |
412 | { |
413 | return list_is_singular(head); |
414 | } |
415 | |
416 | static inline bool sctp_chunk_pending(const struct sctp_chunk *chunk) |
417 | { |
418 | return !list_empty(head: &chunk->list); |
419 | } |
420 | |
421 | /* Walk through a list of TLV parameters. Don't trust the |
422 | * individual parameter lengths and instead depend on |
423 | * the chunk length to indicate when to stop. Make sure |
424 | * there is room for a param header too. |
425 | */ |
426 | #define sctp_walk_params(pos, chunk)\ |
427 | _sctp_walk_params((pos), (chunk), ntohs((chunk)->chunk_hdr.length)) |
428 | |
429 | #define _sctp_walk_params(pos, chunk, end)\ |
430 | for (pos.v = (u8 *)(chunk + 1);\ |
431 | (pos.v + offsetof(struct sctp_paramhdr, length) + sizeof(pos.p->length) <=\ |
432 | (void *)chunk + end) &&\ |
433 | pos.v <= (void *)chunk + end - ntohs(pos.p->length) &&\ |
434 | ntohs(pos.p->length) >= sizeof(struct sctp_paramhdr);\ |
435 | pos.v += SCTP_PAD4(ntohs(pos.p->length))) |
436 | |
437 | #define sctp_walk_errors(err, chunk_hdr)\ |
438 | _sctp_walk_errors((err), (chunk_hdr), ntohs((chunk_hdr)->length)) |
439 | |
440 | #define _sctp_walk_errors(err, chunk_hdr, end)\ |
441 | for (err = (struct sctp_errhdr *)((void *)chunk_hdr + \ |
442 | sizeof(struct sctp_chunkhdr));\ |
443 | ((void *)err + offsetof(struct sctp_errhdr, length) + sizeof(err->length) <=\ |
444 | (void *)chunk_hdr + end) &&\ |
445 | (void *)err <= (void *)chunk_hdr + end - ntohs(err->length) &&\ |
446 | ntohs(err->length) >= sizeof(struct sctp_errhdr); \ |
447 | err = (struct sctp_errhdr *)((void *)err + SCTP_PAD4(ntohs(err->length)))) |
448 | |
449 | #define sctp_walk_fwdtsn(pos, chunk)\ |
450 | _sctp_walk_fwdtsn((pos), (chunk), ntohs((chunk)->chunk_hdr->length) - sizeof(struct sctp_fwdtsn_chunk)) |
451 | |
452 | #define _sctp_walk_fwdtsn(pos, chunk, end)\ |
453 | for (pos = (void *)(chunk->subh.fwdtsn_hdr + 1);\ |
454 | (void *)pos <= (void *)(chunk->subh.fwdtsn_hdr + 1) + end - sizeof(struct sctp_fwdtsn_skip);\ |
455 | pos++) |
456 | |
457 | /* External references. */ |
458 | |
459 | extern struct proto sctp_prot; |
460 | extern struct proto sctpv6_prot; |
461 | void sctp_put_port(struct sock *sk); |
462 | |
463 | extern struct idr sctp_assocs_id; |
464 | extern spinlock_t sctp_assocs_id_lock; |
465 | |
466 | /* Static inline functions. */ |
467 | |
468 | /* Convert from an IP version number to an Address Family symbol. */ |
469 | static inline int ipver2af(__u8 ipver) |
470 | { |
471 | switch (ipver) { |
472 | case 4: |
473 | return AF_INET; |
474 | case 6: |
475 | return AF_INET6; |
476 | default: |
477 | return 0; |
478 | } |
479 | } |
480 | |
481 | /* Convert from an address parameter type to an address family. */ |
482 | static inline int param_type2af(__be16 type) |
483 | { |
484 | switch (type) { |
485 | case SCTP_PARAM_IPV4_ADDRESS: |
486 | return AF_INET; |
487 | case SCTP_PARAM_IPV6_ADDRESS: |
488 | return AF_INET6; |
489 | default: |
490 | return 0; |
491 | } |
492 | } |
493 | |
494 | /* Warning: The following hash functions assume a power of two 'size'. */ |
495 | /* This is the hash function for the SCTP port hash table. */ |
496 | static inline int sctp_phashfn(struct net *net, __u16 lport) |
497 | { |
498 | return (net_hash_mix(net) + lport) & (sctp_port_hashsize - 1); |
499 | } |
500 | |
501 | /* This is the hash function for the endpoint hash table. */ |
502 | static inline int sctp_ep_hashfn(struct net *net, __u16 lport) |
503 | { |
504 | return (net_hash_mix(net) + lport) & (sctp_ep_hashsize - 1); |
505 | } |
506 | |
507 | #define sctp_for_each_hentry(ep, head) \ |
508 | hlist_for_each_entry(ep, head, node) |
509 | |
510 | /* Is a socket of this style? */ |
511 | #define sctp_style(sk, style) __sctp_style((sk), (SCTP_SOCKET_##style)) |
512 | static inline int __sctp_style(const struct sock *sk, |
513 | enum sctp_socket_type style) |
514 | { |
515 | return sctp_sk(sk)->type == style; |
516 | } |
517 | |
518 | /* Is the association in this state? */ |
519 | #define sctp_state(asoc, state) __sctp_state((asoc), (SCTP_STATE_##state)) |
520 | static inline int __sctp_state(const struct sctp_association *asoc, |
521 | enum sctp_state state) |
522 | { |
523 | return asoc->state == state; |
524 | } |
525 | |
526 | /* Is the socket in this state? */ |
527 | #define sctp_sstate(sk, state) __sctp_sstate((sk), (SCTP_SS_##state)) |
528 | static inline int __sctp_sstate(const struct sock *sk, |
529 | enum sctp_sock_state state) |
530 | { |
531 | return sk->sk_state == state; |
532 | } |
533 | |
534 | /* Map v4-mapped v6 address back to v4 address */ |
535 | static inline void sctp_v6_map_v4(union sctp_addr *addr) |
536 | { |
537 | addr->v4.sin_family = AF_INET; |
538 | addr->v4.sin_port = addr->v6.sin6_port; |
539 | addr->v4.sin_addr.s_addr = addr->v6.sin6_addr.s6_addr32[3]; |
540 | } |
541 | |
542 | /* Map v4 address to v4-mapped v6 address */ |
543 | static inline void sctp_v4_map_v6(union sctp_addr *addr) |
544 | { |
545 | __be16 port; |
546 | |
547 | port = addr->v4.sin_port; |
548 | addr->v6.sin6_addr.s6_addr32[3] = addr->v4.sin_addr.s_addr; |
549 | addr->v6.sin6_port = port; |
550 | addr->v6.sin6_family = AF_INET6; |
551 | addr->v6.sin6_flowinfo = 0; |
552 | addr->v6.sin6_scope_id = 0; |
553 | addr->v6.sin6_addr.s6_addr32[0] = 0; |
554 | addr->v6.sin6_addr.s6_addr32[1] = 0; |
555 | addr->v6.sin6_addr.s6_addr32[2] = htonl(0x0000ffff); |
556 | } |
557 | |
558 | /* The cookie is always 0 since this is how it's used in the |
559 | * pmtu code. |
560 | */ |
561 | static inline struct dst_entry *sctp_transport_dst_check(struct sctp_transport *t) |
562 | { |
563 | if (t->dst && !dst_check(dst: t->dst, cookie: t->dst_cookie)) |
564 | sctp_transport_dst_release(t); |
565 | |
566 | return t->dst; |
567 | } |
568 | |
569 | /* Calculate max payload size given a MTU, or the total overhead if |
570 | * given MTU is zero |
571 | */ |
572 | static inline __u32 __sctp_mtu_payload(const struct sctp_sock *sp, |
573 | const struct sctp_transport *t, |
574 | __u32 mtu, __u32 ) |
575 | { |
576 | __u32 overhead = sizeof(struct sctphdr) + extra; |
577 | |
578 | if (sp) { |
579 | overhead += sp->pf->af->net_header_len; |
580 | if (sp->udp_port && (!t || t->encap_port)) |
581 | overhead += sizeof(struct udphdr); |
582 | } else { |
583 | overhead += sizeof(struct ipv6hdr); |
584 | } |
585 | |
586 | if (WARN_ON_ONCE(mtu && mtu <= overhead)) |
587 | mtu = overhead; |
588 | |
589 | return mtu ? mtu - overhead : overhead; |
590 | } |
591 | |
592 | static inline __u32 sctp_mtu_payload(const struct sctp_sock *sp, |
593 | __u32 mtu, __u32 ) |
594 | { |
595 | return __sctp_mtu_payload(sp, NULL, mtu, extra); |
596 | } |
597 | |
598 | static inline __u32 sctp_dst_mtu(const struct dst_entry *dst) |
599 | { |
600 | return SCTP_TRUNC4(max_t(__u32, dst_mtu(dst), |
601 | SCTP_DEFAULT_MINSEGMENT)); |
602 | } |
603 | |
604 | static inline bool sctp_transport_pmtu_check(struct sctp_transport *t) |
605 | { |
606 | __u32 pmtu = sctp_dst_mtu(dst: t->dst); |
607 | |
608 | if (t->pathmtu == pmtu) |
609 | return true; |
610 | |
611 | t->pathmtu = pmtu; |
612 | |
613 | return false; |
614 | } |
615 | |
616 | static inline __u32 sctp_min_frag_point(struct sctp_sock *sp, __u16 datasize) |
617 | { |
618 | return sctp_mtu_payload(sp, SCTP_DEFAULT_MINSEGMENT, extra: datasize); |
619 | } |
620 | |
621 | static inline int sctp_transport_pl_hlen(struct sctp_transport *t) |
622 | { |
623 | return __sctp_mtu_payload(sp: sctp_sk(sk: t->asoc->base.sk), t, mtu: 0, extra: 0) - |
624 | sizeof(struct sctphdr); |
625 | } |
626 | |
627 | static inline void sctp_transport_pl_reset(struct sctp_transport *t) |
628 | { |
629 | if (t->probe_interval && (t->param_flags & SPP_PMTUD_ENABLE) && |
630 | (t->state == SCTP_ACTIVE || t->state == SCTP_UNKNOWN)) { |
631 | if (t->pl.state == SCTP_PL_DISABLED) { |
632 | t->pl.state = SCTP_PL_BASE; |
633 | t->pl.pmtu = SCTP_BASE_PLPMTU; |
634 | t->pl.probe_size = SCTP_BASE_PLPMTU; |
635 | sctp_transport_reset_probe_timer(transport: t); |
636 | } |
637 | } else { |
638 | if (t->pl.state != SCTP_PL_DISABLED) { |
639 | if (del_timer(timer: &t->probe_timer)) |
640 | sctp_transport_put(t); |
641 | t->pl.state = SCTP_PL_DISABLED; |
642 | } |
643 | } |
644 | } |
645 | |
646 | static inline void sctp_transport_pl_update(struct sctp_transport *t) |
647 | { |
648 | if (t->pl.state == SCTP_PL_DISABLED) |
649 | return; |
650 | |
651 | t->pl.state = SCTP_PL_BASE; |
652 | t->pl.pmtu = SCTP_BASE_PLPMTU; |
653 | t->pl.probe_size = SCTP_BASE_PLPMTU; |
654 | sctp_transport_reset_probe_timer(transport: t); |
655 | } |
656 | |
657 | static inline bool sctp_transport_pl_enabled(struct sctp_transport *t) |
658 | { |
659 | return t->pl.state != SCTP_PL_DISABLED; |
660 | } |
661 | |
662 | static inline bool sctp_newsk_ready(const struct sock *sk) |
663 | { |
664 | return sock_flag(sk, flag: SOCK_DEAD) || sk->sk_socket; |
665 | } |
666 | |
667 | static inline void sctp_sock_set_nodelay(struct sock *sk) |
668 | { |
669 | lock_sock(sk); |
670 | sctp_sk(sk)->nodelay = true; |
671 | release_sock(sk); |
672 | } |
673 | |
674 | #endif /* __net_sctp_h__ */ |
675 | |