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7
8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10#include <linux/module.h>
11#include <linux/net.h>
12#include <linux/skbuff.h>
13#include <linux/udp.h>
14#include <linux/in.h>
15#include <linux/in6.h>
16#include <linux/slab.h>
17#include <linux/hashtable.h>
18#include <net/sock.h>
19#include <net/af_rxrpc.h>
20#include <net/ip.h>
21#include <net/route.h>
22#include <net/ip6_route.h>
23#include "ar-internal.h"
24
25
26
27
28static unsigned long rxrpc_peer_hash_key(struct rxrpc_local *local,
29 const struct sockaddr_rxrpc *srx)
30{
31 const u16 *p;
32 unsigned int i, size;
33 unsigned long hash_key;
34
35 _enter("");
36
37 hash_key = (unsigned long)local / __alignof__(*local);
38 hash_key += srx->transport_type;
39 hash_key += srx->transport_len;
40 hash_key += srx->transport.family;
41
42 switch (srx->transport.family) {
43 case AF_INET:
44 hash_key += (u16 __force)srx->transport.sin.sin_port;
45 size = sizeof(srx->transport.sin.sin_addr);
46 p = (u16 *)&srx->transport.sin.sin_addr;
47 break;
48#ifdef CONFIG_AF_RXRPC_IPV6
49 case AF_INET6:
50 hash_key += (u16 __force)srx->transport.sin.sin_port;
51 size = sizeof(srx->transport.sin6.sin6_addr);
52 p = (u16 *)&srx->transport.sin6.sin6_addr;
53 break;
54#endif
55 default:
56 WARN(1, "AF_RXRPC: Unsupported transport address family\n");
57 return 0;
58 }
59
60
61 for (i = 0; i < size; i += sizeof(*p), p++)
62 hash_key += *p;
63
64 _leave(" 0x%lx", hash_key);
65 return hash_key;
66}
67
68
69
70
71
72
73
74
75
76static long rxrpc_peer_cmp_key(const struct rxrpc_peer *peer,
77 struct rxrpc_local *local,
78 const struct sockaddr_rxrpc *srx,
79 unsigned long hash_key)
80{
81 long diff;
82
83 diff = ((peer->hash_key - hash_key) ?:
84 ((unsigned long)peer->local - (unsigned long)local) ?:
85 (peer->srx.transport_type - srx->transport_type) ?:
86 (peer->srx.transport_len - srx->transport_len) ?:
87 (peer->srx.transport.family - srx->transport.family));
88 if (diff != 0)
89 return diff;
90
91 switch (srx->transport.family) {
92 case AF_INET:
93 return ((u16 __force)peer->srx.transport.sin.sin_port -
94 (u16 __force)srx->transport.sin.sin_port) ?:
95 memcmp(&peer->srx.transport.sin.sin_addr,
96 &srx->transport.sin.sin_addr,
97 sizeof(struct in_addr));
98#ifdef CONFIG_AF_RXRPC_IPV6
99 case AF_INET6:
100 return ((u16 __force)peer->srx.transport.sin6.sin6_port -
101 (u16 __force)srx->transport.sin6.sin6_port) ?:
102 memcmp(&peer->srx.transport.sin6.sin6_addr,
103 &srx->transport.sin6.sin6_addr,
104 sizeof(struct in6_addr));
105#endif
106 default:
107 BUG();
108 }
109}
110
111
112
113
114static struct rxrpc_peer *__rxrpc_lookup_peer_rcu(
115 struct rxrpc_local *local,
116 const struct sockaddr_rxrpc *srx,
117 unsigned long hash_key)
118{
119 struct rxrpc_peer *peer;
120 struct rxrpc_net *rxnet = local->rxnet;
121
122 hash_for_each_possible_rcu(rxnet->peer_hash, peer, hash_link, hash_key) {
123 if (rxrpc_peer_cmp_key(peer, local, srx, hash_key) == 0 &&
124 atomic_read(&peer->usage) > 0)
125 return peer;
126 }
127
128 return NULL;
129}
130
131
132
133
134struct rxrpc_peer *rxrpc_lookup_peer_rcu(struct rxrpc_local *local,
135 const struct sockaddr_rxrpc *srx)
136{
137 struct rxrpc_peer *peer;
138 unsigned long hash_key = rxrpc_peer_hash_key(local, srx);
139
140 peer = __rxrpc_lookup_peer_rcu(local, srx, hash_key);
141 if (peer) {
142 _net("PEER %d {%pISp}", peer->debug_id, &peer->srx.transport);
143 _leave(" = %p {u=%d}", peer, atomic_read(&peer->usage));
144 }
145 return peer;
146}
147
148
149
150
151
152static void rxrpc_assess_MTU_size(struct rxrpc_sock *rx,
153 struct rxrpc_peer *peer)
154{
155 struct net *net = sock_net(&rx->sk);
156 struct dst_entry *dst;
157 struct rtable *rt;
158 struct flowi fl;
159 struct flowi4 *fl4 = &fl.u.ip4;
160#ifdef CONFIG_AF_RXRPC_IPV6
161 struct flowi6 *fl6 = &fl.u.ip6;
162#endif
163
164 peer->if_mtu = 1500;
165
166 memset(&fl, 0, sizeof(fl));
167 switch (peer->srx.transport.family) {
168 case AF_INET:
169 rt = ip_route_output_ports(
170 net, fl4, NULL,
171 peer->srx.transport.sin.sin_addr.s_addr, 0,
172 htons(7000), htons(7001), IPPROTO_UDP, 0, 0);
173 if (IS_ERR(rt)) {
174 _leave(" [route err %ld]", PTR_ERR(rt));
175 return;
176 }
177 dst = &rt->dst;
178 break;
179
180#ifdef CONFIG_AF_RXRPC_IPV6
181 case AF_INET6:
182 fl6->flowi6_iif = LOOPBACK_IFINDEX;
183 fl6->flowi6_scope = RT_SCOPE_UNIVERSE;
184 fl6->flowi6_proto = IPPROTO_UDP;
185 memcpy(&fl6->daddr, &peer->srx.transport.sin6.sin6_addr,
186 sizeof(struct in6_addr));
187 fl6->fl6_dport = htons(7001);
188 fl6->fl6_sport = htons(7000);
189 dst = ip6_route_output(net, NULL, fl6);
190 if (dst->error) {
191 _leave(" [route err %d]", dst->error);
192 return;
193 }
194 break;
195#endif
196
197 default:
198 BUG();
199 }
200
201 peer->if_mtu = dst_mtu(dst);
202 dst_release(dst);
203
204 _leave(" [if_mtu %u]", peer->if_mtu);
205}
206
207
208
209
210struct rxrpc_peer *rxrpc_alloc_peer(struct rxrpc_local *local, gfp_t gfp)
211{
212 struct rxrpc_peer *peer;
213
214 _enter("");
215
216 peer = kzalloc(sizeof(struct rxrpc_peer), gfp);
217 if (peer) {
218 atomic_set(&peer->usage, 1);
219 peer->local = local;
220 INIT_HLIST_HEAD(&peer->error_targets);
221 peer->service_conns = RB_ROOT;
222 seqlock_init(&peer->service_conn_lock);
223 spin_lock_init(&peer->lock);
224 spin_lock_init(&peer->rtt_input_lock);
225 peer->debug_id = atomic_inc_return(&rxrpc_debug_id);
226
227 if (RXRPC_TX_SMSS > 2190)
228 peer->cong_cwnd = 2;
229 else if (RXRPC_TX_SMSS > 1095)
230 peer->cong_cwnd = 3;
231 else
232 peer->cong_cwnd = 4;
233 }
234
235 _leave(" = %p", peer);
236 return peer;
237}
238
239
240
241
242static void rxrpc_init_peer(struct rxrpc_sock *rx, struct rxrpc_peer *peer,
243 unsigned long hash_key)
244{
245 peer->hash_key = hash_key;
246 rxrpc_assess_MTU_size(rx, peer);
247 peer->mtu = peer->if_mtu;
248 peer->rtt_last_req = ktime_get_real();
249
250 switch (peer->srx.transport.family) {
251 case AF_INET:
252 peer->hdrsize = sizeof(struct iphdr);
253 break;
254#ifdef CONFIG_AF_RXRPC_IPV6
255 case AF_INET6:
256 peer->hdrsize = sizeof(struct ipv6hdr);
257 break;
258#endif
259 default:
260 BUG();
261 }
262
263 switch (peer->srx.transport_type) {
264 case SOCK_DGRAM:
265 peer->hdrsize += sizeof(struct udphdr);
266 break;
267 default:
268 BUG();
269 }
270
271 peer->hdrsize += sizeof(struct rxrpc_wire_header);
272 peer->maxdata = peer->mtu - peer->hdrsize;
273}
274
275
276
277
278static struct rxrpc_peer *rxrpc_create_peer(struct rxrpc_sock *rx,
279 struct rxrpc_local *local,
280 struct sockaddr_rxrpc *srx,
281 unsigned long hash_key,
282 gfp_t gfp)
283{
284 struct rxrpc_peer *peer;
285
286 _enter("");
287
288 peer = rxrpc_alloc_peer(local, gfp);
289 if (peer) {
290 memcpy(&peer->srx, srx, sizeof(*srx));
291 rxrpc_init_peer(rx, peer, hash_key);
292 }
293
294 _leave(" = %p", peer);
295 return peer;
296}
297
298
299
300
301
302
303void rxrpc_new_incoming_peer(struct rxrpc_sock *rx, struct rxrpc_local *local,
304 struct rxrpc_peer *peer)
305{
306 struct rxrpc_net *rxnet = local->rxnet;
307 unsigned long hash_key;
308
309 hash_key = rxrpc_peer_hash_key(local, &peer->srx);
310 peer->local = local;
311 rxrpc_init_peer(rx, peer, hash_key);
312
313 spin_lock(&rxnet->peer_hash_lock);
314 hash_add_rcu(rxnet->peer_hash, &peer->hash_link, hash_key);
315 list_add_tail(&peer->keepalive_link, &rxnet->peer_keepalive_new);
316 spin_unlock(&rxnet->peer_hash_lock);
317}
318
319
320
321
322struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_sock *rx,
323 struct rxrpc_local *local,
324 struct sockaddr_rxrpc *srx, gfp_t gfp)
325{
326 struct rxrpc_peer *peer, *candidate;
327 struct rxrpc_net *rxnet = local->rxnet;
328 unsigned long hash_key = rxrpc_peer_hash_key(local, srx);
329
330 _enter("{%pISp}", &srx->transport);
331
332
333 rcu_read_lock();
334 peer = __rxrpc_lookup_peer_rcu(local, srx, hash_key);
335 if (peer && !rxrpc_get_peer_maybe(peer))
336 peer = NULL;
337 rcu_read_unlock();
338
339 if (!peer) {
340
341
342
343 candidate = rxrpc_create_peer(rx, local, srx, hash_key, gfp);
344 if (!candidate) {
345 _leave(" = NULL [nomem]");
346 return NULL;
347 }
348
349 spin_lock_bh(&rxnet->peer_hash_lock);
350
351
352 peer = __rxrpc_lookup_peer_rcu(local, srx, hash_key);
353 if (peer && !rxrpc_get_peer_maybe(peer))
354 peer = NULL;
355 if (!peer) {
356 hash_add_rcu(rxnet->peer_hash,
357 &candidate->hash_link, hash_key);
358 list_add_tail(&candidate->keepalive_link,
359 &rxnet->peer_keepalive_new);
360 }
361
362 spin_unlock_bh(&rxnet->peer_hash_lock);
363
364 if (peer)
365 kfree(candidate);
366 else
367 peer = candidate;
368 }
369
370 _net("PEER %d {%pISp}", peer->debug_id, &peer->srx.transport);
371
372 _leave(" = %p {u=%d}", peer, atomic_read(&peer->usage));
373 return peer;
374}
375
376
377
378
379struct rxrpc_peer *rxrpc_get_peer(struct rxrpc_peer *peer)
380{
381 const void *here = __builtin_return_address(0);
382 int n;
383
384 n = atomic_inc_return(&peer->usage);
385 trace_rxrpc_peer(peer, rxrpc_peer_got, n, here);
386 return peer;
387}
388
389
390
391
392struct rxrpc_peer *rxrpc_get_peer_maybe(struct rxrpc_peer *peer)
393{
394 const void *here = __builtin_return_address(0);
395
396 if (peer) {
397 int n = atomic_fetch_add_unless(&peer->usage, 1, 0);
398 if (n > 0)
399 trace_rxrpc_peer(peer, rxrpc_peer_got, n + 1, here);
400 else
401 peer = NULL;
402 }
403 return peer;
404}
405
406
407
408
409static void __rxrpc_put_peer(struct rxrpc_peer *peer)
410{
411 struct rxrpc_net *rxnet = peer->local->rxnet;
412
413 ASSERT(hlist_empty(&peer->error_targets));
414
415 spin_lock_bh(&rxnet->peer_hash_lock);
416 hash_del_rcu(&peer->hash_link);
417 list_del_init(&peer->keepalive_link);
418 spin_unlock_bh(&rxnet->peer_hash_lock);
419
420 kfree_rcu(peer, rcu);
421}
422
423
424
425
426void rxrpc_put_peer(struct rxrpc_peer *peer)
427{
428 const void *here = __builtin_return_address(0);
429 int n;
430
431 if (peer) {
432 n = atomic_dec_return(&peer->usage);
433 trace_rxrpc_peer(peer, rxrpc_peer_put, n, here);
434 if (n == 0)
435 __rxrpc_put_peer(peer);
436 }
437}
438
439
440
441
442
443void rxrpc_put_peer_locked(struct rxrpc_peer *peer)
444{
445 const void *here = __builtin_return_address(0);
446 int n;
447
448 n = atomic_dec_return(&peer->usage);
449 trace_rxrpc_peer(peer, rxrpc_peer_put, n, here);
450 if (n == 0) {
451 hash_del_rcu(&peer->hash_link);
452 list_del_init(&peer->keepalive_link);
453 kfree_rcu(peer, rcu);
454 }
455}
456
457
458
459
460void rxrpc_destroy_all_peers(struct rxrpc_net *rxnet)
461{
462 struct rxrpc_peer *peer;
463 int i;
464
465 for (i = 0; i < HASH_SIZE(rxnet->peer_hash); i++) {
466 if (hlist_empty(&rxnet->peer_hash[i]))
467 continue;
468
469 hlist_for_each_entry(peer, &rxnet->peer_hash[i], hash_link) {
470 pr_err("Leaked peer %u {%u} %pISp\n",
471 peer->debug_id,
472 atomic_read(&peer->usage),
473 &peer->srx.transport);
474 }
475 }
476}
477
478
479
480
481
482
483
484
485
486void rxrpc_kernel_get_peer(struct socket *sock, struct rxrpc_call *call,
487 struct sockaddr_rxrpc *_srx)
488{
489 *_srx = call->peer->srx;
490}
491EXPORT_SYMBOL(rxrpc_kernel_get_peer);
492
493
494
495
496
497
498
499
500u64 rxrpc_kernel_get_rtt(struct socket *sock, struct rxrpc_call *call)
501{
502 return call->peer->rtt;
503}
504EXPORT_SYMBOL(rxrpc_kernel_get_rtt);
505