Commit | Line | Data |
---|---|---|
2b27bdcc | 1 | // SPDX-License-Identifier: GPL-2.0-only |
ba113a94 RDC |
2 | /* |
3 | * File: socket.c | |
4 | * | |
5 | * Phonet sockets | |
6 | * | |
7 | * Copyright (C) 2008 Nokia Corporation. | |
8 | * | |
31fdc555 RDC |
9 | * Authors: Sakari Ailus <sakari.ailus@nokia.com> |
10 | * Rémi Denis-Courmont | |
ba113a94 RDC |
11 | */ |
12 | ||
5a0e3ad6 | 13 | #include <linux/gfp.h> |
ba113a94 RDC |
14 | #include <linux/kernel.h> |
15 | #include <linux/net.h> | |
9995a32b | 16 | #include <linux/poll.h> |
174cd4b1 IM |
17 | #include <linux/sched/signal.h> |
18 | ||
ba113a94 RDC |
19 | #include <net/sock.h> |
20 | #include <net/tcp_states.h> | |
21 | ||
22 | #include <linux/phonet.h> | |
bc3b2d7f | 23 | #include <linux/export.h> |
ba113a94 | 24 | #include <net/phonet/phonet.h> |
9995a32b | 25 | #include <net/phonet/pep.h> |
ba113a94 RDC |
26 | #include <net/phonet/pn_dev.h> |
27 | ||
28 | static int pn_socket_release(struct socket *sock) | |
29 | { | |
30 | struct sock *sk = sock->sk; | |
31 | ||
32 | if (sk) { | |
33 | sock->sk = NULL; | |
34 | sk->sk_prot->close(sk, 0); | |
35 | } | |
36 | return 0; | |
37 | } | |
38 | ||
6b0d07ba RDC |
39 | #define PN_HASHSIZE 16 |
40 | #define PN_HASHMASK (PN_HASHSIZE-1) | |
41 | ||
42 | ||
ba113a94 | 43 | static struct { |
6b0d07ba | 44 | struct hlist_head hlist[PN_HASHSIZE]; |
44f4d5a2 | 45 | struct mutex lock; |
6b0d07ba RDC |
46 | } pnsocks; |
47 | ||
48 | void __init pn_sock_init(void) | |
49 | { | |
95c96174 | 50 | unsigned int i; |
6b0d07ba RDC |
51 | |
52 | for (i = 0; i < PN_HASHSIZE; i++) | |
53 | INIT_HLIST_HEAD(pnsocks.hlist + i); | |
44f4d5a2 | 54 | mutex_init(&pnsocks.lock); |
6b0d07ba RDC |
55 | } |
56 | ||
57 | static struct hlist_head *pn_hash_list(u16 obj) | |
58 | { | |
59 | return pnsocks.hlist + (obj & PN_HASHMASK); | |
60 | } | |
ba113a94 RDC |
61 | |
62 | /* | |
63 | * Find address based on socket address, match only certain fields. | |
64 | * Also grab sock if it was found. Remember to sock_put it later. | |
65 | */ | |
52404881 | 66 | struct sock *pn_find_sock_by_sa(struct net *net, const struct sockaddr_pn *spn) |
ba113a94 | 67 | { |
ba113a94 RDC |
68 | struct sock *sknode; |
69 | struct sock *rval = NULL; | |
70 | u16 obj = pn_sockaddr_get_object(spn); | |
71 | u8 res = spn->spn_resource; | |
6b0d07ba | 72 | struct hlist_head *hlist = pn_hash_list(obj); |
ba113a94 | 73 | |
44f4d5a2 | 74 | rcu_read_lock(); |
b67bfe0d | 75 | sk_for_each_rcu(sknode, hlist) { |
ba113a94 RDC |
76 | struct pn_sock *pn = pn_sk(sknode); |
77 | BUG_ON(!pn->sobject); /* unbound socket */ | |
78 | ||
52404881 RDC |
79 | if (!net_eq(sock_net(sknode), net)) |
80 | continue; | |
ba113a94 RDC |
81 | if (pn_port(obj)) { |
82 | /* Look up socket by port */ | |
83 | if (pn_port(pn->sobject) != pn_port(obj)) | |
84 | continue; | |
85 | } else { | |
86 | /* If port is zero, look up by resource */ | |
87 | if (pn->resource != res) | |
88 | continue; | |
89 | } | |
f64f9e71 JP |
90 | if (pn_addr(pn->sobject) && |
91 | pn_addr(pn->sobject) != pn_addr(obj)) | |
ba113a94 RDC |
92 | continue; |
93 | ||
94 | rval = sknode; | |
95 | sock_hold(sknode); | |
96 | break; | |
97 | } | |
44f4d5a2 | 98 | rcu_read_unlock(); |
ba113a94 RDC |
99 | |
100 | return rval; | |
f14001fc RDC |
101 | } |
102 | ||
103 | /* Deliver a broadcast packet (only in bottom-half) */ | |
104 | void pn_deliver_sock_broadcast(struct net *net, struct sk_buff *skb) | |
105 | { | |
6b0d07ba | 106 | struct hlist_head *hlist = pnsocks.hlist; |
95c96174 | 107 | unsigned int h; |
f14001fc | 108 | |
44f4d5a2 | 109 | rcu_read_lock(); |
6b0d07ba | 110 | for (h = 0; h < PN_HASHSIZE; h++) { |
6b0d07ba | 111 | struct sock *sknode; |
f14001fc | 112 | |
b67bfe0d | 113 | sk_for_each(sknode, hlist) { |
6b0d07ba | 114 | struct sk_buff *clone; |
ba113a94 | 115 | |
6b0d07ba RDC |
116 | if (!net_eq(sock_net(sknode), net)) |
117 | continue; | |
118 | if (!sock_flag(sknode, SOCK_BROADCAST)) | |
119 | continue; | |
120 | ||
121 | clone = skb_clone(skb, GFP_ATOMIC); | |
122 | if (clone) { | |
123 | sock_hold(sknode); | |
124 | sk_receive_skb(sknode, clone, 0); | |
125 | } | |
21912d1c | 126 | } |
6b0d07ba | 127 | hlist++; |
f14001fc | 128 | } |
44f4d5a2 | 129 | rcu_read_unlock(); |
ba113a94 RDC |
130 | } |
131 | ||
086c653f | 132 | int pn_sock_hash(struct sock *sk) |
ba113a94 | 133 | { |
6b0d07ba RDC |
134 | struct hlist_head *hlist = pn_hash_list(pn_sk(sk)->sobject); |
135 | ||
44f4d5a2 RDC |
136 | mutex_lock(&pnsocks.lock); |
137 | sk_add_node_rcu(sk, hlist); | |
138 | mutex_unlock(&pnsocks.lock); | |
086c653f CG |
139 | |
140 | return 0; | |
ba113a94 RDC |
141 | } |
142 | EXPORT_SYMBOL(pn_sock_hash); | |
143 | ||
144 | void pn_sock_unhash(struct sock *sk) | |
145 | { | |
44f4d5a2 RDC |
146 | mutex_lock(&pnsocks.lock); |
147 | sk_del_node_init_rcu(sk); | |
148 | mutex_unlock(&pnsocks.lock); | |
7417fa83 | 149 | pn_sock_unbind_all_res(sk); |
44f4d5a2 | 150 | synchronize_rcu(); |
ba113a94 RDC |
151 | } |
152 | EXPORT_SYMBOL(pn_sock_unhash); | |
153 | ||
582b0b61 RDC |
154 | static DEFINE_MUTEX(port_mutex); |
155 | ||
ba113a94 RDC |
156 | static int pn_socket_bind(struct socket *sock, struct sockaddr *addr, int len) |
157 | { | |
158 | struct sock *sk = sock->sk; | |
159 | struct pn_sock *pn = pn_sk(sk); | |
160 | struct sockaddr_pn *spn = (struct sockaddr_pn *)addr; | |
161 | int err; | |
162 | u16 handle; | |
163 | u8 saddr; | |
164 | ||
165 | if (sk->sk_prot->bind) | |
166 | return sk->sk_prot->bind(sk, addr, len); | |
167 | ||
168 | if (len < sizeof(struct sockaddr_pn)) | |
169 | return -EINVAL; | |
170 | if (spn->spn_family != AF_PHONET) | |
171 | return -EAFNOSUPPORT; | |
172 | ||
173 | handle = pn_sockaddr_get_object((struct sockaddr_pn *)addr); | |
174 | saddr = pn_addr(handle); | |
52404881 | 175 | if (saddr && phonet_address_lookup(sock_net(sk), saddr)) |
ba113a94 RDC |
176 | return -EADDRNOTAVAIL; |
177 | ||
178 | lock_sock(sk); | |
179 | if (sk->sk_state != TCP_CLOSE || pn_port(pn->sobject)) { | |
180 | err = -EINVAL; /* attempt to rebind */ | |
181 | goto out; | |
182 | } | |
582b0b61 RDC |
183 | WARN_ON(sk_hashed(sk)); |
184 | mutex_lock(&port_mutex); | |
ba113a94 RDC |
185 | err = sk->sk_prot->get_port(sk, pn_port(handle)); |
186 | if (err) | |
582b0b61 | 187 | goto out_port; |
ba113a94 RDC |
188 | |
189 | /* get_port() sets the port, bind() sets the address if applicable */ | |
190 | pn->sobject = pn_object(saddr, pn_port(pn->sobject)); | |
191 | pn->resource = spn->spn_resource; | |
192 | ||
193 | /* Enable RX on the socket */ | |
086c653f | 194 | err = sk->sk_prot->hash(sk); |
582b0b61 RDC |
195 | out_port: |
196 | mutex_unlock(&port_mutex); | |
ba113a94 RDC |
197 | out: |
198 | release_sock(sk); | |
199 | return err; | |
200 | } | |
201 | ||
202 | static int pn_socket_autobind(struct socket *sock) | |
203 | { | |
204 | struct sockaddr_pn sa; | |
205 | int err; | |
206 | ||
207 | memset(&sa, 0, sizeof(sa)); | |
208 | sa.spn_family = AF_PHONET; | |
209 | err = pn_socket_bind(sock, (struct sockaddr *)&sa, | |
210 | sizeof(struct sockaddr_pn)); | |
211 | if (err != -EINVAL) | |
212 | return err; | |
213 | BUG_ON(!pn_port(pn_sk(sock->sk)->sobject)); | |
214 | return 0; /* socket was already bound */ | |
215 | } | |
216 | ||
b3d62553 KS |
217 | static int pn_socket_connect(struct socket *sock, struct sockaddr *addr, |
218 | int len, int flags) | |
219 | { | |
220 | struct sock *sk = sock->sk; | |
297edb60 | 221 | struct pn_sock *pn = pn_sk(sk); |
b3d62553 | 222 | struct sockaddr_pn *spn = (struct sockaddr_pn *)addr; |
297edb60 RDC |
223 | struct task_struct *tsk = current; |
224 | long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
b3d62553 KS |
225 | int err; |
226 | ||
297edb60 RDC |
227 | if (pn_socket_autobind(sock)) |
228 | return -ENOBUFS; | |
b3d62553 KS |
229 | if (len < sizeof(struct sockaddr_pn)) |
230 | return -EINVAL; | |
231 | if (spn->spn_family != AF_PHONET) | |
232 | return -EAFNOSUPPORT; | |
233 | ||
234 | lock_sock(sk); | |
235 | ||
236 | switch (sock->state) { | |
237 | case SS_UNCONNECTED: | |
297edb60 | 238 | if (sk->sk_state != TCP_CLOSE) { |
b3d62553 KS |
239 | err = -EISCONN; |
240 | goto out; | |
b3d62553 KS |
241 | } |
242 | break; | |
297edb60 RDC |
243 | case SS_CONNECTING: |
244 | err = -EALREADY; | |
245 | goto out; | |
246 | default: | |
247 | err = -EISCONN; | |
248 | goto out; | |
b3d62553 | 249 | } |
b3d62553 | 250 | |
297edb60 RDC |
251 | pn->dobject = pn_sockaddr_get_object(spn); |
252 | pn->resource = pn_sockaddr_get_resource(spn); | |
b3d62553 | 253 | sock->state = SS_CONNECTING; |
297edb60 | 254 | |
b3d62553 | 255 | err = sk->sk_prot->connect(sk, addr, len); |
297edb60 | 256 | if (err) { |
b3d62553 | 257 | sock->state = SS_UNCONNECTED; |
297edb60 | 258 | pn->dobject = 0; |
b3d62553 KS |
259 | goto out; |
260 | } | |
261 | ||
297edb60 RDC |
262 | while (sk->sk_state == TCP_SYN_SENT) { |
263 | DEFINE_WAIT(wait); | |
b3d62553 | 264 | |
297edb60 RDC |
265 | if (!timeo) { |
266 | err = -EINPROGRESS; | |
267 | goto out; | |
268 | } | |
269 | if (signal_pending(tsk)) { | |
270 | err = sock_intr_errno(timeo); | |
271 | goto out; | |
272 | } | |
b3d62553 | 273 | |
297edb60 RDC |
274 | prepare_to_wait_exclusive(sk_sleep(sk), &wait, |
275 | TASK_INTERRUPTIBLE); | |
276 | release_sock(sk); | |
277 | timeo = schedule_timeout(timeo); | |
278 | lock_sock(sk); | |
279 | finish_wait(sk_sleep(sk), &wait); | |
b3d62553 | 280 | } |
b3d62553 | 281 | |
297edb60 RDC |
282 | if ((1 << sk->sk_state) & (TCPF_SYN_RECV|TCPF_ESTABLISHED)) |
283 | err = 0; | |
284 | else if (sk->sk_state == TCP_CLOSE_WAIT) | |
285 | err = -ECONNRESET; | |
286 | else | |
287 | err = -ECONNREFUSED; | |
288 | sock->state = err ? SS_UNCONNECTED : SS_CONNECTED; | |
b3d62553 KS |
289 | out: |
290 | release_sock(sk); | |
291 | return err; | |
292 | } | |
b3d62553 | 293 | |
9995a32b | 294 | static int pn_socket_accept(struct socket *sock, struct socket *newsock, |
92ef0fd5 | 295 | struct proto_accept_arg *arg) |
9995a32b RDC |
296 | { |
297 | struct sock *sk = sock->sk; | |
298 | struct sock *newsk; | |
9995a32b | 299 | |
f7ae8d59 RDC |
300 | if (unlikely(sk->sk_state != TCP_LISTEN)) |
301 | return -EINVAL; | |
302 | ||
92ef0fd5 | 303 | newsk = sk->sk_prot->accept(sk, arg); |
9995a32b | 304 | if (!newsk) |
92ef0fd5 | 305 | return arg->err; |
9995a32b RDC |
306 | |
307 | lock_sock(newsk); | |
308 | sock_graft(newsk, newsock); | |
309 | newsock->state = SS_CONNECTED; | |
310 | release_sock(newsk); | |
311 | return 0; | |
312 | } | |
313 | ||
ba113a94 | 314 | static int pn_socket_getname(struct socket *sock, struct sockaddr *addr, |
9b2c45d4 | 315 | int peer) |
ba113a94 RDC |
316 | { |
317 | struct sock *sk = sock->sk; | |
318 | struct pn_sock *pn = pn_sk(sk); | |
319 | ||
320 | memset(addr, 0, sizeof(struct sockaddr_pn)); | |
321 | addr->sa_family = AF_PHONET; | |
322 | if (!peer) /* Race with bind() here is userland's problem. */ | |
323 | pn_sockaddr_set_object((struct sockaddr_pn *)addr, | |
324 | pn->sobject); | |
325 | ||
9b2c45d4 | 326 | return sizeof(struct sockaddr_pn); |
ba113a94 RDC |
327 | } |
328 | ||
a11e1d43 LT |
329 | static __poll_t pn_socket_poll(struct file *file, struct socket *sock, |
330 | poll_table *wait) | |
9995a32b RDC |
331 | { |
332 | struct sock *sk = sock->sk; | |
333 | struct pep_sock *pn = pep_sk(sk); | |
ade994f4 | 334 | __poll_t mask = 0; |
9995a32b | 335 | |
a11e1d43 LT |
336 | poll_wait(file, sk_sleep(sk), wait); |
337 | ||
f7ae8d59 | 338 | if (sk->sk_state == TCP_CLOSE) |
a9a08845 | 339 | return EPOLLERR; |
3ef7cf57 | 340 | if (!skb_queue_empty_lockless(&sk->sk_receive_queue)) |
a9a08845 | 341 | mask |= EPOLLIN | EPOLLRDNORM; |
3ef7cf57 | 342 | if (!skb_queue_empty_lockless(&pn->ctrlreq_queue)) |
a9a08845 | 343 | mask |= EPOLLPRI; |
c41bd97f | 344 | if (!mask && sk->sk_state == TCP_CLOSE_WAIT) |
a9a08845 | 345 | return EPOLLHUP; |
9995a32b | 346 | |
01b38606 | 347 | if (sk->sk_state == TCP_ESTABLISHED && |
14afee4b | 348 | refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf && |
01b38606 | 349 | atomic_read(&pn->tx_credits)) |
a9a08845 | 350 | mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND; |
9995a32b RDC |
351 | |
352 | return mask; | |
353 | } | |
354 | ||
ba113a94 RDC |
355 | static int pn_socket_ioctl(struct socket *sock, unsigned int cmd, |
356 | unsigned long arg) | |
357 | { | |
358 | struct sock *sk = sock->sk; | |
359 | struct pn_sock *pn = pn_sk(sk); | |
360 | ||
361 | if (cmd == SIOCPNGETOBJECT) { | |
362 | struct net_device *dev; | |
363 | u16 handle; | |
364 | u8 saddr; | |
365 | ||
366 | if (get_user(handle, (__u16 __user *)arg)) | |
367 | return -EFAULT; | |
368 | ||
369 | lock_sock(sk); | |
370 | if (sk->sk_bound_dev_if) | |
371 | dev = dev_get_by_index(sock_net(sk), | |
372 | sk->sk_bound_dev_if); | |
373 | else | |
374 | dev = phonet_device_get(sock_net(sk)); | |
375 | if (dev && (dev->flags & IFF_UP)) | |
376 | saddr = phonet_address_get(dev, pn_addr(handle)); | |
377 | else | |
378 | saddr = PN_NO_ADDR; | |
379 | release_sock(sk); | |
380 | ||
1160dfa1 | 381 | dev_put(dev); |
ba113a94 RDC |
382 | if (saddr == PN_NO_ADDR) |
383 | return -EHOSTUNREACH; | |
384 | ||
385 | handle = pn_object(saddr, pn_port(pn->sobject)); | |
386 | return put_user(handle, (__u16 __user *)arg); | |
387 | } | |
388 | ||
e1d001fa | 389 | return sk_ioctl(sk, cmd, (void __user *)arg); |
ba113a94 RDC |
390 | } |
391 | ||
9995a32b RDC |
392 | static int pn_socket_listen(struct socket *sock, int backlog) |
393 | { | |
394 | struct sock *sk = sock->sk; | |
395 | int err = 0; | |
396 | ||
9995a32b RDC |
397 | if (pn_socket_autobind(sock)) |
398 | return -ENOBUFS; | |
399 | ||
400 | lock_sock(sk); | |
96241544 | 401 | if (sock->state != SS_UNCONNECTED) { |
9995a32b RDC |
402 | err = -EINVAL; |
403 | goto out; | |
404 | } | |
405 | ||
96241544 RDC |
406 | if (sk->sk_state != TCP_LISTEN) { |
407 | sk->sk_state = TCP_LISTEN; | |
408 | sk->sk_ack_backlog = 0; | |
409 | } | |
9995a32b RDC |
410 | sk->sk_max_ack_backlog = backlog; |
411 | out: | |
412 | release_sock(sk); | |
413 | return err; | |
414 | } | |
415 | ||
1b784140 YX |
416 | static int pn_socket_sendmsg(struct socket *sock, struct msghdr *m, |
417 | size_t total_len) | |
ba113a94 RDC |
418 | { |
419 | struct sock *sk = sock->sk; | |
420 | ||
421 | if (pn_socket_autobind(sock)) | |
422 | return -EAGAIN; | |
423 | ||
1b784140 | 424 | return sk->sk_prot->sendmsg(sk, m, total_len); |
ba113a94 RDC |
425 | } |
426 | ||
427 | const struct proto_ops phonet_dgram_ops = { | |
428 | .family = AF_PHONET, | |
429 | .owner = THIS_MODULE, | |
430 | .release = pn_socket_release, | |
431 | .bind = pn_socket_bind, | |
432 | .connect = sock_no_connect, | |
433 | .socketpair = sock_no_socketpair, | |
434 | .accept = sock_no_accept, | |
435 | .getname = pn_socket_getname, | |
a11e1d43 | 436 | .poll = datagram_poll, |
ba113a94 RDC |
437 | .ioctl = pn_socket_ioctl, |
438 | .listen = sock_no_listen, | |
439 | .shutdown = sock_no_shutdown, | |
ba113a94 RDC |
440 | .sendmsg = pn_socket_sendmsg, |
441 | .recvmsg = sock_common_recvmsg, | |
442 | .mmap = sock_no_mmap, | |
ba113a94 RDC |
443 | }; |
444 | ||
9995a32b RDC |
445 | const struct proto_ops phonet_stream_ops = { |
446 | .family = AF_PHONET, | |
447 | .owner = THIS_MODULE, | |
448 | .release = pn_socket_release, | |
449 | .bind = pn_socket_bind, | |
b3d62553 | 450 | .connect = pn_socket_connect, |
9995a32b RDC |
451 | .socketpair = sock_no_socketpair, |
452 | .accept = pn_socket_accept, | |
453 | .getname = pn_socket_getname, | |
a11e1d43 | 454 | .poll = pn_socket_poll, |
9995a32b RDC |
455 | .ioctl = pn_socket_ioctl, |
456 | .listen = pn_socket_listen, | |
457 | .shutdown = sock_no_shutdown, | |
02a47617 RDC |
458 | .setsockopt = sock_common_setsockopt, |
459 | .getsockopt = sock_common_getsockopt, | |
9995a32b RDC |
460 | .sendmsg = pn_socket_sendmsg, |
461 | .recvmsg = sock_common_recvmsg, | |
462 | .mmap = sock_no_mmap, | |
9995a32b RDC |
463 | }; |
464 | EXPORT_SYMBOL(phonet_stream_ops); | |
465 | ||
ba113a94 RDC |
466 | /* allocate port for a socket */ |
467 | int pn_sock_get_port(struct sock *sk, unsigned short sport) | |
468 | { | |
469 | static int port_cur; | |
52404881 | 470 | struct net *net = sock_net(sk); |
ba113a94 RDC |
471 | struct pn_sock *pn = pn_sk(sk); |
472 | struct sockaddr_pn try_sa; | |
473 | struct sock *tmpsk; | |
474 | ||
475 | memset(&try_sa, 0, sizeof(struct sockaddr_pn)); | |
476 | try_sa.spn_family = AF_PHONET; | |
582b0b61 | 477 | WARN_ON(!mutex_is_locked(&port_mutex)); |
ba113a94 RDC |
478 | if (!sport) { |
479 | /* search free port */ | |
87ab4e20 | 480 | int port, pmin, pmax; |
ba113a94 | 481 | |
87ab4e20 | 482 | phonet_get_local_port_range(&pmin, &pmax); |
ba113a94 RDC |
483 | for (port = pmin; port <= pmax; port++) { |
484 | port_cur++; | |
485 | if (port_cur < pmin || port_cur > pmax) | |
486 | port_cur = pmin; | |
487 | ||
488 | pn_sockaddr_set_port(&try_sa, port_cur); | |
52404881 | 489 | tmpsk = pn_find_sock_by_sa(net, &try_sa); |
ba113a94 RDC |
490 | if (tmpsk == NULL) { |
491 | sport = port_cur; | |
492 | goto found; | |
493 | } else | |
494 | sock_put(tmpsk); | |
495 | } | |
496 | } else { | |
497 | /* try to find specific port */ | |
498 | pn_sockaddr_set_port(&try_sa, sport); | |
52404881 | 499 | tmpsk = pn_find_sock_by_sa(net, &try_sa); |
ba113a94 RDC |
500 | if (tmpsk == NULL) |
501 | /* No sock there! We can use that port... */ | |
502 | goto found; | |
503 | else | |
504 | sock_put(tmpsk); | |
505 | } | |
ba113a94 RDC |
506 | /* the port must be in use already */ |
507 | return -EADDRINUSE; | |
508 | ||
509 | found: | |
ba113a94 RDC |
510 | pn->sobject = pn_object(pn_addr(pn->sobject), sport); |
511 | return 0; | |
512 | } | |
513 | EXPORT_SYMBOL(pn_sock_get_port); | |
c1dc13e9 | 514 | |
ae6e2aef | 515 | #ifdef CONFIG_PROC_FS |
c1dc13e9 RDC |
516 | static struct sock *pn_sock_get_idx(struct seq_file *seq, loff_t pos) |
517 | { | |
518 | struct net *net = seq_file_net(seq); | |
6b0d07ba | 519 | struct hlist_head *hlist = pnsocks.hlist; |
c1dc13e9 | 520 | struct sock *sknode; |
95c96174 | 521 | unsigned int h; |
c1dc13e9 | 522 | |
6b0d07ba | 523 | for (h = 0; h < PN_HASHSIZE; h++) { |
b67bfe0d | 524 | sk_for_each_rcu(sknode, hlist) { |
6b0d07ba RDC |
525 | if (!net_eq(net, sock_net(sknode))) |
526 | continue; | |
527 | if (!pos) | |
528 | return sknode; | |
529 | pos--; | |
530 | } | |
531 | hlist++; | |
c1dc13e9 RDC |
532 | } |
533 | return NULL; | |
534 | } | |
535 | ||
536 | static struct sock *pn_sock_get_next(struct seq_file *seq, struct sock *sk) | |
537 | { | |
538 | struct net *net = seq_file_net(seq); | |
539 | ||
540 | do | |
541 | sk = sk_next(sk); | |
542 | while (sk && !net_eq(net, sock_net(sk))); | |
543 | ||
544 | return sk; | |
545 | } | |
546 | ||
547 | static void *pn_sock_seq_start(struct seq_file *seq, loff_t *pos) | |
44f4d5a2 | 548 | __acquires(rcu) |
c1dc13e9 | 549 | { |
44f4d5a2 | 550 | rcu_read_lock(); |
c1dc13e9 RDC |
551 | return *pos ? pn_sock_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
552 | } | |
553 | ||
554 | static void *pn_sock_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
555 | { | |
556 | struct sock *sk; | |
557 | ||
558 | if (v == SEQ_START_TOKEN) | |
559 | sk = pn_sock_get_idx(seq, 0); | |
560 | else | |
561 | sk = pn_sock_get_next(seq, v); | |
562 | (*pos)++; | |
563 | return sk; | |
564 | } | |
565 | ||
566 | static void pn_sock_seq_stop(struct seq_file *seq, void *v) | |
44f4d5a2 | 567 | __releases(rcu) |
c1dc13e9 | 568 | { |
44f4d5a2 | 569 | rcu_read_unlock(); |
c1dc13e9 RDC |
570 | } |
571 | ||
572 | static int pn_sock_seq_show(struct seq_file *seq, void *v) | |
573 | { | |
652586df | 574 | seq_setwidth(seq, 127); |
c1dc13e9 | 575 | if (v == SEQ_START_TOKEN) |
652586df TH |
576 | seq_puts(seq, "pt loc rem rs st tx_queue rx_queue " |
577 | " uid inode ref pointer drops"); | |
c1dc13e9 RDC |
578 | else { |
579 | struct sock *sk = v; | |
580 | struct pn_sock *pn = pn_sk(sk); | |
581 | ||
582 | seq_printf(seq, "%2d %04X:%04X:%02X %02X %08X:%08X %5d %lu " | |
ea9a0379 | 583 | "%d %pK %u", |
a8059512 RDC |
584 | sk->sk_protocol, pn->sobject, pn->dobject, |
585 | pn->resource, sk->sk_state, | |
c1dc13e9 | 586 | sk_wmem_alloc_get(sk), sk_rmem_alloc_get(sk), |
a7cb5a49 EB |
587 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)), |
588 | sock_i_ino(sk), | |
41c6d650 | 589 | refcount_read(&sk->sk_refcnt), sk, |
652586df | 590 | atomic_read(&sk->sk_drops)); |
c1dc13e9 | 591 | } |
652586df | 592 | seq_pad(seq, '\n'); |
c1dc13e9 RDC |
593 | return 0; |
594 | } | |
595 | ||
c3506372 | 596 | const struct seq_operations pn_sock_seq_ops = { |
c1dc13e9 RDC |
597 | .start = pn_sock_seq_start, |
598 | .next = pn_sock_seq_next, | |
599 | .stop = pn_sock_seq_stop, | |
600 | .show = pn_sock_seq_show, | |
601 | }; | |
ae6e2aef | 602 | #endif |
4e3d16ce RDC |
603 | |
604 | static struct { | |
605 | struct sock *sk[256]; | |
606 | } pnres; | |
607 | ||
608 | /* | |
609 | * Find and hold socket based on resource. | |
610 | */ | |
611 | struct sock *pn_find_sock_by_res(struct net *net, u8 res) | |
612 | { | |
613 | struct sock *sk; | |
614 | ||
615 | if (!net_eq(net, &init_net)) | |
616 | return NULL; | |
617 | ||
618 | rcu_read_lock(); | |
619 | sk = rcu_dereference(pnres.sk[res]); | |
620 | if (sk) | |
621 | sock_hold(sk); | |
622 | rcu_read_unlock(); | |
623 | return sk; | |
624 | } | |
625 | ||
626 | static DEFINE_MUTEX(resource_mutex); | |
627 | ||
628 | int pn_sock_bind_res(struct sock *sk, u8 res) | |
629 | { | |
630 | int ret = -EADDRINUSE; | |
631 | ||
632 | if (!net_eq(sock_net(sk), &init_net)) | |
633 | return -ENOIOCTLCMD; | |
634 | if (!capable(CAP_SYS_ADMIN)) | |
635 | return -EPERM; | |
636 | if (pn_socket_autobind(sk->sk_socket)) | |
637 | return -EAGAIN; | |
638 | ||
639 | mutex_lock(&resource_mutex); | |
640 | if (pnres.sk[res] == NULL) { | |
641 | sock_hold(sk); | |
cf778b00 | 642 | rcu_assign_pointer(pnres.sk[res], sk); |
4e3d16ce RDC |
643 | ret = 0; |
644 | } | |
645 | mutex_unlock(&resource_mutex); | |
646 | return ret; | |
647 | } | |
648 | ||
649 | int pn_sock_unbind_res(struct sock *sk, u8 res) | |
650 | { | |
651 | int ret = -ENOENT; | |
652 | ||
653 | if (!capable(CAP_SYS_ADMIN)) | |
654 | return -EPERM; | |
655 | ||
656 | mutex_lock(&resource_mutex); | |
657 | if (pnres.sk[res] == sk) { | |
a9b3cd7f | 658 | RCU_INIT_POINTER(pnres.sk[res], NULL); |
4e3d16ce RDC |
659 | ret = 0; |
660 | } | |
661 | mutex_unlock(&resource_mutex); | |
662 | ||
663 | if (ret == 0) { | |
664 | synchronize_rcu(); | |
665 | sock_put(sk); | |
666 | } | |
667 | return ret; | |
668 | } | |
669 | ||
670 | void pn_sock_unbind_all_res(struct sock *sk) | |
671 | { | |
95c96174 | 672 | unsigned int res, match = 0; |
4e3d16ce RDC |
673 | |
674 | mutex_lock(&resource_mutex); | |
675 | for (res = 0; res < 256; res++) { | |
676 | if (pnres.sk[res] == sk) { | |
a9b3cd7f | 677 | RCU_INIT_POINTER(pnres.sk[res], NULL); |
4e3d16ce RDC |
678 | match++; |
679 | } | |
680 | } | |
681 | mutex_unlock(&resource_mutex); | |
682 | ||
4e3d16ce | 683 | while (match > 0) { |
44f4d5a2 | 684 | __sock_put(sk); |
4e3d16ce RDC |
685 | match--; |
686 | } | |
44f4d5a2 | 687 | /* Caller is responsible for RCU sync before final sock_put() */ |
4e3d16ce | 688 | } |
507215f8 RDC |
689 | |
690 | #ifdef CONFIG_PROC_FS | |
691 | static struct sock **pn_res_get_idx(struct seq_file *seq, loff_t pos) | |
692 | { | |
693 | struct net *net = seq_file_net(seq); | |
95c96174 | 694 | unsigned int i; |
507215f8 RDC |
695 | |
696 | if (!net_eq(net, &init_net)) | |
697 | return NULL; | |
698 | ||
699 | for (i = 0; i < 256; i++) { | |
700 | if (pnres.sk[i] == NULL) | |
701 | continue; | |
702 | if (!pos) | |
703 | return pnres.sk + i; | |
704 | pos--; | |
705 | } | |
706 | return NULL; | |
707 | } | |
708 | ||
709 | static struct sock **pn_res_get_next(struct seq_file *seq, struct sock **sk) | |
710 | { | |
711 | struct net *net = seq_file_net(seq); | |
95c96174 | 712 | unsigned int i; |
507215f8 RDC |
713 | |
714 | BUG_ON(!net_eq(net, &init_net)); | |
715 | ||
716 | for (i = (sk - pnres.sk) + 1; i < 256; i++) | |
717 | if (pnres.sk[i]) | |
718 | return pnres.sk + i; | |
719 | return NULL; | |
720 | } | |
721 | ||
722 | static void *pn_res_seq_start(struct seq_file *seq, loff_t *pos) | |
723 | __acquires(resource_mutex) | |
724 | { | |
725 | mutex_lock(&resource_mutex); | |
726 | return *pos ? pn_res_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; | |
727 | } | |
728 | ||
729 | static void *pn_res_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
730 | { | |
731 | struct sock **sk; | |
732 | ||
733 | if (v == SEQ_START_TOKEN) | |
734 | sk = pn_res_get_idx(seq, 0); | |
735 | else | |
736 | sk = pn_res_get_next(seq, v); | |
737 | (*pos)++; | |
738 | return sk; | |
739 | } | |
740 | ||
741 | static void pn_res_seq_stop(struct seq_file *seq, void *v) | |
742 | __releases(resource_mutex) | |
743 | { | |
744 | mutex_unlock(&resource_mutex); | |
745 | } | |
746 | ||
747 | static int pn_res_seq_show(struct seq_file *seq, void *v) | |
748 | { | |
652586df | 749 | seq_setwidth(seq, 63); |
507215f8 | 750 | if (v == SEQ_START_TOKEN) |
652586df | 751 | seq_puts(seq, "rs uid inode"); |
507215f8 RDC |
752 | else { |
753 | struct sock **psk = v; | |
754 | struct sock *sk = *psk; | |
755 | ||
652586df | 756 | seq_printf(seq, "%02X %5u %lu", |
a7cb5a49 EB |
757 | (int) (psk - pnres.sk), |
758 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)), | |
652586df | 759 | sock_i_ino(sk)); |
507215f8 | 760 | } |
652586df | 761 | seq_pad(seq, '\n'); |
507215f8 RDC |
762 | return 0; |
763 | } | |
764 | ||
c3506372 | 765 | const struct seq_operations pn_res_seq_ops = { |
507215f8 RDC |
766 | .start = pn_res_seq_start, |
767 | .next = pn_res_seq_next, | |
768 | .stop = pn_res_seq_stop, | |
769 | .show = pn_res_seq_show, | |
770 | }; | |
507215f8 | 771 | #endif |