Commit | Line | Data |
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ba113a94 RDC |
1 | /* |
2 | * File: socket.c | |
3 | * | |
4 | * Phonet sockets | |
5 | * | |
6 | * Copyright (C) 2008 Nokia Corporation. | |
7 | * | |
8 | * Contact: Remi Denis-Courmont <remi.denis-courmont@nokia.com> | |
9 | * Original author: Sakari Ailus <sakari.ailus@nokia.com> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public License | |
13 | * version 2 as published by the Free Software Foundation. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, but | |
16 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
18 | * General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
23 | * 02110-1301 USA | |
24 | */ | |
25 | ||
5a0e3ad6 | 26 | #include <linux/gfp.h> |
ba113a94 RDC |
27 | #include <linux/kernel.h> |
28 | #include <linux/net.h> | |
9995a32b | 29 | #include <linux/poll.h> |
ba113a94 RDC |
30 | #include <net/sock.h> |
31 | #include <net/tcp_states.h> | |
32 | ||
33 | #include <linux/phonet.h> | |
bc3b2d7f | 34 | #include <linux/export.h> |
ba113a94 | 35 | #include <net/phonet/phonet.h> |
9995a32b | 36 | #include <net/phonet/pep.h> |
ba113a94 RDC |
37 | #include <net/phonet/pn_dev.h> |
38 | ||
39 | static int pn_socket_release(struct socket *sock) | |
40 | { | |
41 | struct sock *sk = sock->sk; | |
42 | ||
43 | if (sk) { | |
44 | sock->sk = NULL; | |
45 | sk->sk_prot->close(sk, 0); | |
46 | } | |
47 | return 0; | |
48 | } | |
49 | ||
6b0d07ba RDC |
50 | #define PN_HASHSIZE 16 |
51 | #define PN_HASHMASK (PN_HASHSIZE-1) | |
52 | ||
53 | ||
ba113a94 | 54 | static struct { |
6b0d07ba | 55 | struct hlist_head hlist[PN_HASHSIZE]; |
44f4d5a2 | 56 | struct mutex lock; |
6b0d07ba RDC |
57 | } pnsocks; |
58 | ||
59 | void __init pn_sock_init(void) | |
60 | { | |
61 | unsigned i; | |
62 | ||
63 | for (i = 0; i < PN_HASHSIZE; i++) | |
64 | INIT_HLIST_HEAD(pnsocks.hlist + i); | |
44f4d5a2 | 65 | mutex_init(&pnsocks.lock); |
6b0d07ba RDC |
66 | } |
67 | ||
68 | static struct hlist_head *pn_hash_list(u16 obj) | |
69 | { | |
70 | return pnsocks.hlist + (obj & PN_HASHMASK); | |
71 | } | |
ba113a94 RDC |
72 | |
73 | /* | |
74 | * Find address based on socket address, match only certain fields. | |
75 | * Also grab sock if it was found. Remember to sock_put it later. | |
76 | */ | |
52404881 | 77 | struct sock *pn_find_sock_by_sa(struct net *net, const struct sockaddr_pn *spn) |
ba113a94 RDC |
78 | { |
79 | struct hlist_node *node; | |
80 | struct sock *sknode; | |
81 | struct sock *rval = NULL; | |
82 | u16 obj = pn_sockaddr_get_object(spn); | |
83 | u8 res = spn->spn_resource; | |
6b0d07ba | 84 | struct hlist_head *hlist = pn_hash_list(obj); |
ba113a94 | 85 | |
44f4d5a2 RDC |
86 | rcu_read_lock(); |
87 | sk_for_each_rcu(sknode, node, hlist) { | |
ba113a94 RDC |
88 | struct pn_sock *pn = pn_sk(sknode); |
89 | BUG_ON(!pn->sobject); /* unbound socket */ | |
90 | ||
52404881 RDC |
91 | if (!net_eq(sock_net(sknode), net)) |
92 | continue; | |
ba113a94 RDC |
93 | if (pn_port(obj)) { |
94 | /* Look up socket by port */ | |
95 | if (pn_port(pn->sobject) != pn_port(obj)) | |
96 | continue; | |
97 | } else { | |
98 | /* If port is zero, look up by resource */ | |
99 | if (pn->resource != res) | |
100 | continue; | |
101 | } | |
f64f9e71 JP |
102 | if (pn_addr(pn->sobject) && |
103 | pn_addr(pn->sobject) != pn_addr(obj)) | |
ba113a94 RDC |
104 | continue; |
105 | ||
106 | rval = sknode; | |
107 | sock_hold(sknode); | |
108 | break; | |
109 | } | |
44f4d5a2 | 110 | rcu_read_unlock(); |
ba113a94 RDC |
111 | |
112 | return rval; | |
f14001fc RDC |
113 | } |
114 | ||
115 | /* Deliver a broadcast packet (only in bottom-half) */ | |
116 | void pn_deliver_sock_broadcast(struct net *net, struct sk_buff *skb) | |
117 | { | |
6b0d07ba RDC |
118 | struct hlist_head *hlist = pnsocks.hlist; |
119 | unsigned h; | |
f14001fc | 120 | |
44f4d5a2 | 121 | rcu_read_lock(); |
6b0d07ba RDC |
122 | for (h = 0; h < PN_HASHSIZE; h++) { |
123 | struct hlist_node *node; | |
124 | struct sock *sknode; | |
f14001fc | 125 | |
6b0d07ba RDC |
126 | sk_for_each(sknode, node, hlist) { |
127 | struct sk_buff *clone; | |
ba113a94 | 128 | |
6b0d07ba RDC |
129 | if (!net_eq(sock_net(sknode), net)) |
130 | continue; | |
131 | if (!sock_flag(sknode, SOCK_BROADCAST)) | |
132 | continue; | |
133 | ||
134 | clone = skb_clone(skb, GFP_ATOMIC); | |
135 | if (clone) { | |
136 | sock_hold(sknode); | |
137 | sk_receive_skb(sknode, clone, 0); | |
138 | } | |
21912d1c | 139 | } |
6b0d07ba | 140 | hlist++; |
f14001fc | 141 | } |
44f4d5a2 | 142 | rcu_read_unlock(); |
ba113a94 RDC |
143 | } |
144 | ||
145 | void pn_sock_hash(struct sock *sk) | |
146 | { | |
6b0d07ba RDC |
147 | struct hlist_head *hlist = pn_hash_list(pn_sk(sk)->sobject); |
148 | ||
44f4d5a2 RDC |
149 | mutex_lock(&pnsocks.lock); |
150 | sk_add_node_rcu(sk, hlist); | |
151 | mutex_unlock(&pnsocks.lock); | |
ba113a94 RDC |
152 | } |
153 | EXPORT_SYMBOL(pn_sock_hash); | |
154 | ||
155 | void pn_sock_unhash(struct sock *sk) | |
156 | { | |
44f4d5a2 RDC |
157 | mutex_lock(&pnsocks.lock); |
158 | sk_del_node_init_rcu(sk); | |
159 | mutex_unlock(&pnsocks.lock); | |
7417fa83 | 160 | pn_sock_unbind_all_res(sk); |
44f4d5a2 | 161 | synchronize_rcu(); |
ba113a94 RDC |
162 | } |
163 | EXPORT_SYMBOL(pn_sock_unhash); | |
164 | ||
582b0b61 RDC |
165 | static DEFINE_MUTEX(port_mutex); |
166 | ||
ba113a94 RDC |
167 | static int pn_socket_bind(struct socket *sock, struct sockaddr *addr, int len) |
168 | { | |
169 | struct sock *sk = sock->sk; | |
170 | struct pn_sock *pn = pn_sk(sk); | |
171 | struct sockaddr_pn *spn = (struct sockaddr_pn *)addr; | |
172 | int err; | |
173 | u16 handle; | |
174 | u8 saddr; | |
175 | ||
176 | if (sk->sk_prot->bind) | |
177 | return sk->sk_prot->bind(sk, addr, len); | |
178 | ||
179 | if (len < sizeof(struct sockaddr_pn)) | |
180 | return -EINVAL; | |
181 | if (spn->spn_family != AF_PHONET) | |
182 | return -EAFNOSUPPORT; | |
183 | ||
184 | handle = pn_sockaddr_get_object((struct sockaddr_pn *)addr); | |
185 | saddr = pn_addr(handle); | |
52404881 | 186 | if (saddr && phonet_address_lookup(sock_net(sk), saddr)) |
ba113a94 RDC |
187 | return -EADDRNOTAVAIL; |
188 | ||
189 | lock_sock(sk); | |
190 | if (sk->sk_state != TCP_CLOSE || pn_port(pn->sobject)) { | |
191 | err = -EINVAL; /* attempt to rebind */ | |
192 | goto out; | |
193 | } | |
582b0b61 RDC |
194 | WARN_ON(sk_hashed(sk)); |
195 | mutex_lock(&port_mutex); | |
ba113a94 RDC |
196 | err = sk->sk_prot->get_port(sk, pn_port(handle)); |
197 | if (err) | |
582b0b61 | 198 | goto out_port; |
ba113a94 RDC |
199 | |
200 | /* get_port() sets the port, bind() sets the address if applicable */ | |
201 | pn->sobject = pn_object(saddr, pn_port(pn->sobject)); | |
202 | pn->resource = spn->spn_resource; | |
203 | ||
204 | /* Enable RX on the socket */ | |
205 | sk->sk_prot->hash(sk); | |
582b0b61 RDC |
206 | out_port: |
207 | mutex_unlock(&port_mutex); | |
ba113a94 RDC |
208 | out: |
209 | release_sock(sk); | |
210 | return err; | |
211 | } | |
212 | ||
213 | static int pn_socket_autobind(struct socket *sock) | |
214 | { | |
215 | struct sockaddr_pn sa; | |
216 | int err; | |
217 | ||
218 | memset(&sa, 0, sizeof(sa)); | |
219 | sa.spn_family = AF_PHONET; | |
220 | err = pn_socket_bind(sock, (struct sockaddr *)&sa, | |
221 | sizeof(struct sockaddr_pn)); | |
222 | if (err != -EINVAL) | |
223 | return err; | |
224 | BUG_ON(!pn_port(pn_sk(sock->sk)->sobject)); | |
225 | return 0; /* socket was already bound */ | |
226 | } | |
227 | ||
b3d62553 KS |
228 | static int pn_socket_connect(struct socket *sock, struct sockaddr *addr, |
229 | int len, int flags) | |
230 | { | |
231 | struct sock *sk = sock->sk; | |
297edb60 | 232 | struct pn_sock *pn = pn_sk(sk); |
b3d62553 | 233 | struct sockaddr_pn *spn = (struct sockaddr_pn *)addr; |
297edb60 RDC |
234 | struct task_struct *tsk = current; |
235 | long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); | |
b3d62553 KS |
236 | int err; |
237 | ||
297edb60 RDC |
238 | if (pn_socket_autobind(sock)) |
239 | return -ENOBUFS; | |
b3d62553 KS |
240 | if (len < sizeof(struct sockaddr_pn)) |
241 | return -EINVAL; | |
242 | if (spn->spn_family != AF_PHONET) | |
243 | return -EAFNOSUPPORT; | |
244 | ||
245 | lock_sock(sk); | |
246 | ||
247 | switch (sock->state) { | |
248 | case SS_UNCONNECTED: | |
297edb60 | 249 | if (sk->sk_state != TCP_CLOSE) { |
b3d62553 KS |
250 | err = -EISCONN; |
251 | goto out; | |
b3d62553 KS |
252 | } |
253 | break; | |
297edb60 RDC |
254 | case SS_CONNECTING: |
255 | err = -EALREADY; | |
256 | goto out; | |
257 | default: | |
258 | err = -EISCONN; | |
259 | goto out; | |
b3d62553 | 260 | } |
b3d62553 | 261 | |
297edb60 RDC |
262 | pn->dobject = pn_sockaddr_get_object(spn); |
263 | pn->resource = pn_sockaddr_get_resource(spn); | |
b3d62553 | 264 | sock->state = SS_CONNECTING; |
297edb60 | 265 | |
b3d62553 | 266 | err = sk->sk_prot->connect(sk, addr, len); |
297edb60 | 267 | if (err) { |
b3d62553 | 268 | sock->state = SS_UNCONNECTED; |
297edb60 | 269 | pn->dobject = 0; |
b3d62553 KS |
270 | goto out; |
271 | } | |
272 | ||
297edb60 RDC |
273 | while (sk->sk_state == TCP_SYN_SENT) { |
274 | DEFINE_WAIT(wait); | |
b3d62553 | 275 | |
297edb60 RDC |
276 | if (!timeo) { |
277 | err = -EINPROGRESS; | |
278 | goto out; | |
279 | } | |
280 | if (signal_pending(tsk)) { | |
281 | err = sock_intr_errno(timeo); | |
282 | goto out; | |
283 | } | |
b3d62553 | 284 | |
297edb60 RDC |
285 | prepare_to_wait_exclusive(sk_sleep(sk), &wait, |
286 | TASK_INTERRUPTIBLE); | |
287 | release_sock(sk); | |
288 | timeo = schedule_timeout(timeo); | |
289 | lock_sock(sk); | |
290 | finish_wait(sk_sleep(sk), &wait); | |
b3d62553 | 291 | } |
b3d62553 | 292 | |
297edb60 RDC |
293 | if ((1 << sk->sk_state) & (TCPF_SYN_RECV|TCPF_ESTABLISHED)) |
294 | err = 0; | |
295 | else if (sk->sk_state == TCP_CLOSE_WAIT) | |
296 | err = -ECONNRESET; | |
297 | else | |
298 | err = -ECONNREFUSED; | |
299 | sock->state = err ? SS_UNCONNECTED : SS_CONNECTED; | |
b3d62553 KS |
300 | out: |
301 | release_sock(sk); | |
302 | return err; | |
303 | } | |
b3d62553 | 304 | |
9995a32b RDC |
305 | static int pn_socket_accept(struct socket *sock, struct socket *newsock, |
306 | int flags) | |
307 | { | |
308 | struct sock *sk = sock->sk; | |
309 | struct sock *newsk; | |
310 | int err; | |
311 | ||
f7ae8d59 RDC |
312 | if (unlikely(sk->sk_state != TCP_LISTEN)) |
313 | return -EINVAL; | |
314 | ||
9995a32b RDC |
315 | newsk = sk->sk_prot->accept(sk, flags, &err); |
316 | if (!newsk) | |
317 | return err; | |
318 | ||
319 | lock_sock(newsk); | |
320 | sock_graft(newsk, newsock); | |
321 | newsock->state = SS_CONNECTED; | |
322 | release_sock(newsk); | |
323 | return 0; | |
324 | } | |
325 | ||
ba113a94 RDC |
326 | static int pn_socket_getname(struct socket *sock, struct sockaddr *addr, |
327 | int *sockaddr_len, int peer) | |
328 | { | |
329 | struct sock *sk = sock->sk; | |
330 | struct pn_sock *pn = pn_sk(sk); | |
331 | ||
332 | memset(addr, 0, sizeof(struct sockaddr_pn)); | |
333 | addr->sa_family = AF_PHONET; | |
334 | if (!peer) /* Race with bind() here is userland's problem. */ | |
335 | pn_sockaddr_set_object((struct sockaddr_pn *)addr, | |
336 | pn->sobject); | |
337 | ||
338 | *sockaddr_len = sizeof(struct sockaddr_pn); | |
339 | return 0; | |
340 | } | |
341 | ||
9995a32b RDC |
342 | static unsigned int pn_socket_poll(struct file *file, struct socket *sock, |
343 | poll_table *wait) | |
344 | { | |
345 | struct sock *sk = sock->sk; | |
346 | struct pep_sock *pn = pep_sk(sk); | |
347 | unsigned int mask = 0; | |
348 | ||
43815482 | 349 | poll_wait(file, sk_sleep(sk), wait); |
9995a32b | 350 | |
f7ae8d59 | 351 | if (sk->sk_state == TCP_CLOSE) |
9995a32b | 352 | return POLLERR; |
9995a32b RDC |
353 | if (!skb_queue_empty(&sk->sk_receive_queue)) |
354 | mask |= POLLIN | POLLRDNORM; | |
c41bd97f RDC |
355 | if (!skb_queue_empty(&pn->ctrlreq_queue)) |
356 | mask |= POLLPRI; | |
357 | if (!mask && sk->sk_state == TCP_CLOSE_WAIT) | |
9995a32b RDC |
358 | return POLLHUP; |
359 | ||
01b38606 RDC |
360 | if (sk->sk_state == TCP_ESTABLISHED && |
361 | atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf && | |
362 | atomic_read(&pn->tx_credits)) | |
9995a32b RDC |
363 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; |
364 | ||
365 | return mask; | |
366 | } | |
367 | ||
ba113a94 RDC |
368 | static int pn_socket_ioctl(struct socket *sock, unsigned int cmd, |
369 | unsigned long arg) | |
370 | { | |
371 | struct sock *sk = sock->sk; | |
372 | struct pn_sock *pn = pn_sk(sk); | |
373 | ||
374 | if (cmd == SIOCPNGETOBJECT) { | |
375 | struct net_device *dev; | |
376 | u16 handle; | |
377 | u8 saddr; | |
378 | ||
379 | if (get_user(handle, (__u16 __user *)arg)) | |
380 | return -EFAULT; | |
381 | ||
382 | lock_sock(sk); | |
383 | if (sk->sk_bound_dev_if) | |
384 | dev = dev_get_by_index(sock_net(sk), | |
385 | sk->sk_bound_dev_if); | |
386 | else | |
387 | dev = phonet_device_get(sock_net(sk)); | |
388 | if (dev && (dev->flags & IFF_UP)) | |
389 | saddr = phonet_address_get(dev, pn_addr(handle)); | |
390 | else | |
391 | saddr = PN_NO_ADDR; | |
392 | release_sock(sk); | |
393 | ||
394 | if (dev) | |
395 | dev_put(dev); | |
396 | if (saddr == PN_NO_ADDR) | |
397 | return -EHOSTUNREACH; | |
398 | ||
399 | handle = pn_object(saddr, pn_port(pn->sobject)); | |
400 | return put_user(handle, (__u16 __user *)arg); | |
401 | } | |
402 | ||
403 | return sk->sk_prot->ioctl(sk, cmd, arg); | |
404 | } | |
405 | ||
9995a32b RDC |
406 | static int pn_socket_listen(struct socket *sock, int backlog) |
407 | { | |
408 | struct sock *sk = sock->sk; | |
409 | int err = 0; | |
410 | ||
9995a32b RDC |
411 | if (pn_socket_autobind(sock)) |
412 | return -ENOBUFS; | |
413 | ||
414 | lock_sock(sk); | |
96241544 | 415 | if (sock->state != SS_UNCONNECTED) { |
9995a32b RDC |
416 | err = -EINVAL; |
417 | goto out; | |
418 | } | |
419 | ||
96241544 RDC |
420 | if (sk->sk_state != TCP_LISTEN) { |
421 | sk->sk_state = TCP_LISTEN; | |
422 | sk->sk_ack_backlog = 0; | |
423 | } | |
9995a32b RDC |
424 | sk->sk_max_ack_backlog = backlog; |
425 | out: | |
426 | release_sock(sk); | |
427 | return err; | |
428 | } | |
429 | ||
ba113a94 RDC |
430 | static int pn_socket_sendmsg(struct kiocb *iocb, struct socket *sock, |
431 | struct msghdr *m, size_t total_len) | |
432 | { | |
433 | struct sock *sk = sock->sk; | |
434 | ||
435 | if (pn_socket_autobind(sock)) | |
436 | return -EAGAIN; | |
437 | ||
438 | return sk->sk_prot->sendmsg(iocb, sk, m, total_len); | |
439 | } | |
440 | ||
441 | const struct proto_ops phonet_dgram_ops = { | |
442 | .family = AF_PHONET, | |
443 | .owner = THIS_MODULE, | |
444 | .release = pn_socket_release, | |
445 | .bind = pn_socket_bind, | |
446 | .connect = sock_no_connect, | |
447 | .socketpair = sock_no_socketpair, | |
448 | .accept = sock_no_accept, | |
449 | .getname = pn_socket_getname, | |
450 | .poll = datagram_poll, | |
451 | .ioctl = pn_socket_ioctl, | |
452 | .listen = sock_no_listen, | |
453 | .shutdown = sock_no_shutdown, | |
454 | .setsockopt = sock_no_setsockopt, | |
455 | .getsockopt = sock_no_getsockopt, | |
456 | #ifdef CONFIG_COMPAT | |
457 | .compat_setsockopt = sock_no_setsockopt, | |
458 | .compat_getsockopt = sock_no_getsockopt, | |
459 | #endif | |
460 | .sendmsg = pn_socket_sendmsg, | |
461 | .recvmsg = sock_common_recvmsg, | |
462 | .mmap = sock_no_mmap, | |
463 | .sendpage = sock_no_sendpage, | |
464 | }; | |
465 | ||
9995a32b RDC |
466 | const struct proto_ops phonet_stream_ops = { |
467 | .family = AF_PHONET, | |
468 | .owner = THIS_MODULE, | |
469 | .release = pn_socket_release, | |
470 | .bind = pn_socket_bind, | |
b3d62553 | 471 | .connect = pn_socket_connect, |
9995a32b RDC |
472 | .socketpair = sock_no_socketpair, |
473 | .accept = pn_socket_accept, | |
474 | .getname = pn_socket_getname, | |
475 | .poll = pn_socket_poll, | |
476 | .ioctl = pn_socket_ioctl, | |
477 | .listen = pn_socket_listen, | |
478 | .shutdown = sock_no_shutdown, | |
02a47617 RDC |
479 | .setsockopt = sock_common_setsockopt, |
480 | .getsockopt = sock_common_getsockopt, | |
9995a32b | 481 | #ifdef CONFIG_COMPAT |
02a47617 RDC |
482 | .compat_setsockopt = compat_sock_common_setsockopt, |
483 | .compat_getsockopt = compat_sock_common_getsockopt, | |
9995a32b RDC |
484 | #endif |
485 | .sendmsg = pn_socket_sendmsg, | |
486 | .recvmsg = sock_common_recvmsg, | |
487 | .mmap = sock_no_mmap, | |
488 | .sendpage = sock_no_sendpage, | |
489 | }; | |
490 | EXPORT_SYMBOL(phonet_stream_ops); | |
491 | ||
ba113a94 RDC |
492 | /* allocate port for a socket */ |
493 | int pn_sock_get_port(struct sock *sk, unsigned short sport) | |
494 | { | |
495 | static int port_cur; | |
52404881 | 496 | struct net *net = sock_net(sk); |
ba113a94 RDC |
497 | struct pn_sock *pn = pn_sk(sk); |
498 | struct sockaddr_pn try_sa; | |
499 | struct sock *tmpsk; | |
500 | ||
501 | memset(&try_sa, 0, sizeof(struct sockaddr_pn)); | |
502 | try_sa.spn_family = AF_PHONET; | |
582b0b61 | 503 | WARN_ON(!mutex_is_locked(&port_mutex)); |
ba113a94 RDC |
504 | if (!sport) { |
505 | /* search free port */ | |
87ab4e20 | 506 | int port, pmin, pmax; |
ba113a94 | 507 | |
87ab4e20 | 508 | phonet_get_local_port_range(&pmin, &pmax); |
ba113a94 RDC |
509 | for (port = pmin; port <= pmax; port++) { |
510 | port_cur++; | |
511 | if (port_cur < pmin || port_cur > pmax) | |
512 | port_cur = pmin; | |
513 | ||
514 | pn_sockaddr_set_port(&try_sa, port_cur); | |
52404881 | 515 | tmpsk = pn_find_sock_by_sa(net, &try_sa); |
ba113a94 RDC |
516 | if (tmpsk == NULL) { |
517 | sport = port_cur; | |
518 | goto found; | |
519 | } else | |
520 | sock_put(tmpsk); | |
521 | } | |
522 | } else { | |
523 | /* try to find specific port */ | |
524 | pn_sockaddr_set_port(&try_sa, sport); | |
52404881 | 525 | tmpsk = pn_find_sock_by_sa(net, &try_sa); |
ba113a94 RDC |
526 | if (tmpsk == NULL) |
527 | /* No sock there! We can use that port... */ | |
528 | goto found; | |
529 | else | |
530 | sock_put(tmpsk); | |
531 | } | |
ba113a94 RDC |
532 | /* the port must be in use already */ |
533 | return -EADDRINUSE; | |
534 | ||
535 | found: | |
ba113a94 RDC |
536 | pn->sobject = pn_object(pn_addr(pn->sobject), sport); |
537 | return 0; | |
538 | } | |
539 | EXPORT_SYMBOL(pn_sock_get_port); | |
c1dc13e9 | 540 | |
ae6e2aef | 541 | #ifdef CONFIG_PROC_FS |
c1dc13e9 RDC |
542 | static struct sock *pn_sock_get_idx(struct seq_file *seq, loff_t pos) |
543 | { | |
544 | struct net *net = seq_file_net(seq); | |
6b0d07ba | 545 | struct hlist_head *hlist = pnsocks.hlist; |
c1dc13e9 RDC |
546 | struct hlist_node *node; |
547 | struct sock *sknode; | |
6b0d07ba | 548 | unsigned h; |
c1dc13e9 | 549 | |
6b0d07ba | 550 | for (h = 0; h < PN_HASHSIZE; h++) { |
44f4d5a2 | 551 | sk_for_each_rcu(sknode, node, hlist) { |
6b0d07ba RDC |
552 | if (!net_eq(net, sock_net(sknode))) |
553 | continue; | |
554 | if (!pos) | |
555 | return sknode; | |
556 | pos--; | |
557 | } | |
558 | hlist++; | |
c1dc13e9 RDC |
559 | } |
560 | return NULL; | |
561 | } | |
562 | ||
563 | static struct sock *pn_sock_get_next(struct seq_file *seq, struct sock *sk) | |
564 | { | |
565 | struct net *net = seq_file_net(seq); | |
566 | ||
567 | do | |
568 | sk = sk_next(sk); | |
569 | while (sk && !net_eq(net, sock_net(sk))); | |
570 | ||
571 | return sk; | |
572 | } | |
573 | ||
574 | static void *pn_sock_seq_start(struct seq_file *seq, loff_t *pos) | |
44f4d5a2 | 575 | __acquires(rcu) |
c1dc13e9 | 576 | { |
44f4d5a2 | 577 | rcu_read_lock(); |
c1dc13e9 RDC |
578 | return *pos ? pn_sock_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
579 | } | |
580 | ||
581 | static void *pn_sock_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
582 | { | |
583 | struct sock *sk; | |
584 | ||
585 | if (v == SEQ_START_TOKEN) | |
586 | sk = pn_sock_get_idx(seq, 0); | |
587 | else | |
588 | sk = pn_sock_get_next(seq, v); | |
589 | (*pos)++; | |
590 | return sk; | |
591 | } | |
592 | ||
593 | static void pn_sock_seq_stop(struct seq_file *seq, void *v) | |
44f4d5a2 | 594 | __releases(rcu) |
c1dc13e9 | 595 | { |
44f4d5a2 | 596 | rcu_read_unlock(); |
c1dc13e9 RDC |
597 | } |
598 | ||
599 | static int pn_sock_seq_show(struct seq_file *seq, void *v) | |
600 | { | |
601 | int len; | |
602 | ||
603 | if (v == SEQ_START_TOKEN) | |
604 | seq_printf(seq, "%s%n", "pt loc rem rs st tx_queue rx_queue " | |
605 | " uid inode ref pointer drops", &len); | |
606 | else { | |
607 | struct sock *sk = v; | |
608 | struct pn_sock *pn = pn_sk(sk); | |
609 | ||
610 | seq_printf(seq, "%2d %04X:%04X:%02X %02X %08X:%08X %5d %lu " | |
71338aa7 | 611 | "%d %pK %d%n", |
a8059512 RDC |
612 | sk->sk_protocol, pn->sobject, pn->dobject, |
613 | pn->resource, sk->sk_state, | |
c1dc13e9 RDC |
614 | sk_wmem_alloc_get(sk), sk_rmem_alloc_get(sk), |
615 | sock_i_uid(sk), sock_i_ino(sk), | |
616 | atomic_read(&sk->sk_refcnt), sk, | |
617 | atomic_read(&sk->sk_drops), &len); | |
618 | } | |
619 | seq_printf(seq, "%*s\n", 127 - len, ""); | |
620 | return 0; | |
621 | } | |
622 | ||
623 | static const struct seq_operations pn_sock_seq_ops = { | |
624 | .start = pn_sock_seq_start, | |
625 | .next = pn_sock_seq_next, | |
626 | .stop = pn_sock_seq_stop, | |
627 | .show = pn_sock_seq_show, | |
628 | }; | |
629 | ||
630 | static int pn_sock_open(struct inode *inode, struct file *file) | |
631 | { | |
cb7d9e7f RDC |
632 | return seq_open_net(inode, file, &pn_sock_seq_ops, |
633 | sizeof(struct seq_net_private)); | |
c1dc13e9 RDC |
634 | } |
635 | ||
636 | const struct file_operations pn_sock_seq_fops = { | |
637 | .owner = THIS_MODULE, | |
638 | .open = pn_sock_open, | |
639 | .read = seq_read, | |
640 | .llseek = seq_lseek, | |
cb7d9e7f | 641 | .release = seq_release_net, |
c1dc13e9 | 642 | }; |
ae6e2aef | 643 | #endif |
4e3d16ce RDC |
644 | |
645 | static struct { | |
646 | struct sock *sk[256]; | |
647 | } pnres; | |
648 | ||
649 | /* | |
650 | * Find and hold socket based on resource. | |
651 | */ | |
652 | struct sock *pn_find_sock_by_res(struct net *net, u8 res) | |
653 | { | |
654 | struct sock *sk; | |
655 | ||
656 | if (!net_eq(net, &init_net)) | |
657 | return NULL; | |
658 | ||
659 | rcu_read_lock(); | |
660 | sk = rcu_dereference(pnres.sk[res]); | |
661 | if (sk) | |
662 | sock_hold(sk); | |
663 | rcu_read_unlock(); | |
664 | return sk; | |
665 | } | |
666 | ||
667 | static DEFINE_MUTEX(resource_mutex); | |
668 | ||
669 | int pn_sock_bind_res(struct sock *sk, u8 res) | |
670 | { | |
671 | int ret = -EADDRINUSE; | |
672 | ||
673 | if (!net_eq(sock_net(sk), &init_net)) | |
674 | return -ENOIOCTLCMD; | |
675 | if (!capable(CAP_SYS_ADMIN)) | |
676 | return -EPERM; | |
677 | if (pn_socket_autobind(sk->sk_socket)) | |
678 | return -EAGAIN; | |
679 | ||
680 | mutex_lock(&resource_mutex); | |
681 | if (pnres.sk[res] == NULL) { | |
682 | sock_hold(sk); | |
cf778b00 | 683 | rcu_assign_pointer(pnres.sk[res], sk); |
4e3d16ce RDC |
684 | ret = 0; |
685 | } | |
686 | mutex_unlock(&resource_mutex); | |
687 | return ret; | |
688 | } | |
689 | ||
690 | int pn_sock_unbind_res(struct sock *sk, u8 res) | |
691 | { | |
692 | int ret = -ENOENT; | |
693 | ||
694 | if (!capable(CAP_SYS_ADMIN)) | |
695 | return -EPERM; | |
696 | ||
697 | mutex_lock(&resource_mutex); | |
698 | if (pnres.sk[res] == sk) { | |
a9b3cd7f | 699 | RCU_INIT_POINTER(pnres.sk[res], NULL); |
4e3d16ce RDC |
700 | ret = 0; |
701 | } | |
702 | mutex_unlock(&resource_mutex); | |
703 | ||
704 | if (ret == 0) { | |
705 | synchronize_rcu(); | |
706 | sock_put(sk); | |
707 | } | |
708 | return ret; | |
709 | } | |
710 | ||
711 | void pn_sock_unbind_all_res(struct sock *sk) | |
712 | { | |
713 | unsigned res, match = 0; | |
714 | ||
715 | mutex_lock(&resource_mutex); | |
716 | for (res = 0; res < 256; res++) { | |
717 | if (pnres.sk[res] == sk) { | |
a9b3cd7f | 718 | RCU_INIT_POINTER(pnres.sk[res], NULL); |
4e3d16ce RDC |
719 | match++; |
720 | } | |
721 | } | |
722 | mutex_unlock(&resource_mutex); | |
723 | ||
4e3d16ce | 724 | while (match > 0) { |
44f4d5a2 | 725 | __sock_put(sk); |
4e3d16ce RDC |
726 | match--; |
727 | } | |
44f4d5a2 | 728 | /* Caller is responsible for RCU sync before final sock_put() */ |
4e3d16ce | 729 | } |
507215f8 RDC |
730 | |
731 | #ifdef CONFIG_PROC_FS | |
732 | static struct sock **pn_res_get_idx(struct seq_file *seq, loff_t pos) | |
733 | { | |
734 | struct net *net = seq_file_net(seq); | |
735 | unsigned i; | |
736 | ||
737 | if (!net_eq(net, &init_net)) | |
738 | return NULL; | |
739 | ||
740 | for (i = 0; i < 256; i++) { | |
741 | if (pnres.sk[i] == NULL) | |
742 | continue; | |
743 | if (!pos) | |
744 | return pnres.sk + i; | |
745 | pos--; | |
746 | } | |
747 | return NULL; | |
748 | } | |
749 | ||
750 | static struct sock **pn_res_get_next(struct seq_file *seq, struct sock **sk) | |
751 | { | |
752 | struct net *net = seq_file_net(seq); | |
753 | unsigned i; | |
754 | ||
755 | BUG_ON(!net_eq(net, &init_net)); | |
756 | ||
757 | for (i = (sk - pnres.sk) + 1; i < 256; i++) | |
758 | if (pnres.sk[i]) | |
759 | return pnres.sk + i; | |
760 | return NULL; | |
761 | } | |
762 | ||
763 | static void *pn_res_seq_start(struct seq_file *seq, loff_t *pos) | |
764 | __acquires(resource_mutex) | |
765 | { | |
766 | mutex_lock(&resource_mutex); | |
767 | return *pos ? pn_res_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; | |
768 | } | |
769 | ||
770 | static void *pn_res_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
771 | { | |
772 | struct sock **sk; | |
773 | ||
774 | if (v == SEQ_START_TOKEN) | |
775 | sk = pn_res_get_idx(seq, 0); | |
776 | else | |
777 | sk = pn_res_get_next(seq, v); | |
778 | (*pos)++; | |
779 | return sk; | |
780 | } | |
781 | ||
782 | static void pn_res_seq_stop(struct seq_file *seq, void *v) | |
783 | __releases(resource_mutex) | |
784 | { | |
785 | mutex_unlock(&resource_mutex); | |
786 | } | |
787 | ||
788 | static int pn_res_seq_show(struct seq_file *seq, void *v) | |
789 | { | |
790 | int len; | |
791 | ||
792 | if (v == SEQ_START_TOKEN) | |
793 | seq_printf(seq, "%s%n", "rs uid inode", &len); | |
794 | else { | |
795 | struct sock **psk = v; | |
796 | struct sock *sk = *psk; | |
797 | ||
798 | seq_printf(seq, "%02X %5d %lu%n", | |
9e0064a5 DM |
799 | (int) (psk - pnres.sk), sock_i_uid(sk), |
800 | sock_i_ino(sk), &len); | |
507215f8 RDC |
801 | } |
802 | seq_printf(seq, "%*s\n", 63 - len, ""); | |
803 | return 0; | |
804 | } | |
805 | ||
806 | static const struct seq_operations pn_res_seq_ops = { | |
807 | .start = pn_res_seq_start, | |
808 | .next = pn_res_seq_next, | |
809 | .stop = pn_res_seq_stop, | |
810 | .show = pn_res_seq_show, | |
811 | }; | |
812 | ||
813 | static int pn_res_open(struct inode *inode, struct file *file) | |
814 | { | |
815 | return seq_open_net(inode, file, &pn_res_seq_ops, | |
816 | sizeof(struct seq_net_private)); | |
817 | } | |
818 | ||
819 | const struct file_operations pn_res_seq_fops = { | |
820 | .owner = THIS_MODULE, | |
821 | .open = pn_res_open, | |
822 | .read = seq_read, | |
823 | .llseek = seq_lseek, | |
824 | .release = seq_release_net, | |
825 | }; | |
826 | #endif |