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Remi Denis-Courmontba113a92008-09-22 20:05:19 -07001/*
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
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090026#include <linux/gfp.h>
Remi Denis-Courmontba113a92008-09-22 20:05:19 -070027#include <linux/kernel.h>
28#include <linux/net.h>
Rémi Denis-Courmont9995a322008-10-05 11:14:48 -070029#include <linux/poll.h>
Remi Denis-Courmontba113a92008-09-22 20:05:19 -070030#include <net/sock.h>
31#include <net/tcp_states.h>
32
33#include <linux/phonet.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040034#include <linux/export.h>
Remi Denis-Courmontba113a92008-09-22 20:05:19 -070035#include <net/phonet/phonet.h>
Rémi Denis-Courmont9995a322008-10-05 11:14:48 -070036#include <net/phonet/pep.h>
Remi Denis-Courmontba113a92008-09-22 20:05:19 -070037#include <net/phonet/pn_dev.h>
38
39static 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
Rémi Denis-Courmont6b0d07b2009-11-09 02:17:01 +000050#define PN_HASHSIZE 16
51#define PN_HASHMASK (PN_HASHSIZE-1)
52
53
Remi Denis-Courmontba113a92008-09-22 20:05:19 -070054static struct {
Rémi Denis-Courmont6b0d07b2009-11-09 02:17:01 +000055 struct hlist_head hlist[PN_HASHSIZE];
Rémi Denis-Courmont44f4d5a2011-04-12 23:27:36 +000056 struct mutex lock;
Rémi Denis-Courmont6b0d07b2009-11-09 02:17:01 +000057} pnsocks;
58
59void __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);
Rémi Denis-Courmont44f4d5a2011-04-12 23:27:36 +000065 mutex_init(&pnsocks.lock);
Rémi Denis-Courmont6b0d07b2009-11-09 02:17:01 +000066}
67
68static struct hlist_head *pn_hash_list(u16 obj)
69{
70 return pnsocks.hlist + (obj & PN_HASHMASK);
71}
Remi Denis-Courmontba113a92008-09-22 20:05:19 -070072
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 */
Rémi Denis-Courmont52404882008-12-03 15:42:56 -080077struct sock *pn_find_sock_by_sa(struct net *net, const struct sockaddr_pn *spn)
Remi Denis-Courmontba113a92008-09-22 20:05:19 -070078{
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;
Rémi Denis-Courmont6b0d07b2009-11-09 02:17:01 +000084 struct hlist_head *hlist = pn_hash_list(obj);
Remi Denis-Courmontba113a92008-09-22 20:05:19 -070085
Rémi Denis-Courmont44f4d5a2011-04-12 23:27:36 +000086 rcu_read_lock();
87 sk_for_each_rcu(sknode, node, hlist) {
Remi Denis-Courmontba113a92008-09-22 20:05:19 -070088 struct pn_sock *pn = pn_sk(sknode);
89 BUG_ON(!pn->sobject); /* unbound socket */
90
Rémi Denis-Courmont52404882008-12-03 15:42:56 -080091 if (!net_eq(sock_net(sknode), net))
92 continue;
Remi Denis-Courmontba113a92008-09-22 20:05:19 -070093 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 }
Joe Perchesf64f9e72009-11-29 16:55:45 -0800102 if (pn_addr(pn->sobject) &&
103 pn_addr(pn->sobject) != pn_addr(obj))
Remi Denis-Courmontba113a92008-09-22 20:05:19 -0700104 continue;
105
106 rval = sknode;
107 sock_hold(sknode);
108 break;
109 }
Rémi Denis-Courmont44f4d5a2011-04-12 23:27:36 +0000110 rcu_read_unlock();
Remi Denis-Courmontba113a92008-09-22 20:05:19 -0700111
112 return rval;
Rémi Denis-Courmontf14001f2009-10-14 00:48:27 +0000113}
Remi Denis-Courmontba113a92008-09-22 20:05:19 -0700114
Rémi Denis-Courmontf14001f2009-10-14 00:48:27 +0000115/* Deliver a broadcast packet (only in bottom-half) */
116void pn_deliver_sock_broadcast(struct net *net, struct sk_buff *skb)
117{
Rémi Denis-Courmont6b0d07b2009-11-09 02:17:01 +0000118 struct hlist_head *hlist = pnsocks.hlist;
119 unsigned h;
Rémi Denis-Courmontf14001f2009-10-14 00:48:27 +0000120
Rémi Denis-Courmont44f4d5a2011-04-12 23:27:36 +0000121 rcu_read_lock();
Rémi Denis-Courmont6b0d07b2009-11-09 02:17:01 +0000122 for (h = 0; h < PN_HASHSIZE; h++) {
123 struct hlist_node *node;
124 struct sock *sknode;
Rémi Denis-Courmontf14001f2009-10-14 00:48:27 +0000125
Rémi Denis-Courmont6b0d07b2009-11-09 02:17:01 +0000126 sk_for_each(sknode, node, hlist) {
127 struct sk_buff *clone;
Rémi Denis-Courmontf14001f2009-10-14 00:48:27 +0000128
Rémi Denis-Courmont6b0d07b2009-11-09 02:17:01 +0000129 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 }
Rémi Denis-Courmont21912d12009-10-15 12:29:14 -0700139 }
Rémi Denis-Courmont6b0d07b2009-11-09 02:17:01 +0000140 hlist++;
Rémi Denis-Courmontf14001f2009-10-14 00:48:27 +0000141 }
Rémi Denis-Courmont44f4d5a2011-04-12 23:27:36 +0000142 rcu_read_unlock();
Remi Denis-Courmontba113a92008-09-22 20:05:19 -0700143}
144
145void pn_sock_hash(struct sock *sk)
146{
Rémi Denis-Courmont6b0d07b2009-11-09 02:17:01 +0000147 struct hlist_head *hlist = pn_hash_list(pn_sk(sk)->sobject);
148
Rémi Denis-Courmont44f4d5a2011-04-12 23:27:36 +0000149 mutex_lock(&pnsocks.lock);
150 sk_add_node_rcu(sk, hlist);
151 mutex_unlock(&pnsocks.lock);
Remi Denis-Courmontba113a92008-09-22 20:05:19 -0700152}
153EXPORT_SYMBOL(pn_sock_hash);
154
155void pn_sock_unhash(struct sock *sk)
156{
Rémi Denis-Courmont44f4d5a2011-04-12 23:27:36 +0000157 mutex_lock(&pnsocks.lock);
158 sk_del_node_init_rcu(sk);
159 mutex_unlock(&pnsocks.lock);
Rémi Denis-Courmont7417fa82010-09-15 12:30:12 +0000160 pn_sock_unbind_all_res(sk);
Rémi Denis-Courmont44f4d5a2011-04-12 23:27:36 +0000161 synchronize_rcu();
Remi Denis-Courmontba113a92008-09-22 20:05:19 -0700162}
163EXPORT_SYMBOL(pn_sock_unhash);
164
Rémi Denis-Courmont582b0b62009-09-23 03:17:10 +0000165static DEFINE_MUTEX(port_mutex);
166
Remi Denis-Courmontba113a92008-09-22 20:05:19 -0700167static 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);
Rémi Denis-Courmont52404882008-12-03 15:42:56 -0800186 if (saddr && phonet_address_lookup(sock_net(sk), saddr))
Remi Denis-Courmontba113a92008-09-22 20:05:19 -0700187 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 }
Rémi Denis-Courmont582b0b62009-09-23 03:17:10 +0000194 WARN_ON(sk_hashed(sk));
195 mutex_lock(&port_mutex);
Remi Denis-Courmontba113a92008-09-22 20:05:19 -0700196 err = sk->sk_prot->get_port(sk, pn_port(handle));
197 if (err)
Rémi Denis-Courmont582b0b62009-09-23 03:17:10 +0000198 goto out_port;
Remi Denis-Courmontba113a92008-09-22 20:05:19 -0700199
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);
Rémi Denis-Courmont582b0b62009-09-23 03:17:10 +0000206out_port:
207 mutex_unlock(&port_mutex);
Remi Denis-Courmontba113a92008-09-22 20:05:19 -0700208out:
209 release_sock(sk);
210 return err;
211}
212
213static 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
Kumar Sanghvib3d62552010-10-12 20:14:43 +0000228static int pn_socket_connect(struct socket *sock, struct sockaddr *addr,
229 int len, int flags)
230{
231 struct sock *sk = sock->sk;
Rémi Denis-Courmont297edb62011-03-08 22:44:12 +0000232 struct pn_sock *pn = pn_sk(sk);
Kumar Sanghvib3d62552010-10-12 20:14:43 +0000233 struct sockaddr_pn *spn = (struct sockaddr_pn *)addr;
Rémi Denis-Courmont297edb62011-03-08 22:44:12 +0000234 struct task_struct *tsk = current;
235 long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
Kumar Sanghvib3d62552010-10-12 20:14:43 +0000236 int err;
237
Rémi Denis-Courmont297edb62011-03-08 22:44:12 +0000238 if (pn_socket_autobind(sock))
239 return -ENOBUFS;
Kumar Sanghvib3d62552010-10-12 20:14:43 +0000240 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:
Rémi Denis-Courmont297edb62011-03-08 22:44:12 +0000249 if (sk->sk_state != TCP_CLOSE) {
250 err = -EISCONN;
251 goto out;
252 }
Kumar Sanghvib3d62552010-10-12 20:14:43 +0000253 break;
254 case SS_CONNECTING:
Rémi Denis-Courmont297edb62011-03-08 22:44:12 +0000255 err = -EALREADY;
256 goto out;
257 default:
258 err = -EISCONN;
259 goto out;
Kumar Sanghvib3d62552010-10-12 20:14:43 +0000260 }
Kumar Sanghvib3d62552010-10-12 20:14:43 +0000261
Rémi Denis-Courmont297edb62011-03-08 22:44:12 +0000262 pn->dobject = pn_sockaddr_get_object(spn);
263 pn->resource = pn_sockaddr_get_resource(spn);
Kumar Sanghvib3d62552010-10-12 20:14:43 +0000264 sock->state = SS_CONNECTING;
Rémi Denis-Courmont297edb62011-03-08 22:44:12 +0000265
Kumar Sanghvib3d62552010-10-12 20:14:43 +0000266 err = sk->sk_prot->connect(sk, addr, len);
Rémi Denis-Courmont297edb62011-03-08 22:44:12 +0000267 if (err) {
Kumar Sanghvib3d62552010-10-12 20:14:43 +0000268 sock->state = SS_UNCONNECTED;
Rémi Denis-Courmont297edb62011-03-08 22:44:12 +0000269 pn->dobject = 0;
Kumar Sanghvib3d62552010-10-12 20:14:43 +0000270 goto out;
271 }
272
Rémi Denis-Courmont297edb62011-03-08 22:44:12 +0000273 while (sk->sk_state == TCP_SYN_SENT) {
274 DEFINE_WAIT(wait);
Kumar Sanghvib3d62552010-10-12 20:14:43 +0000275
Rémi Denis-Courmont297edb62011-03-08 22:44:12 +0000276 if (!timeo) {
277 err = -EINPROGRESS;
278 goto out;
279 }
280 if (signal_pending(tsk)) {
281 err = sock_intr_errno(timeo);
282 goto out;
283 }
Kumar Sanghvib3d62552010-10-12 20:14:43 +0000284
Rémi Denis-Courmont297edb62011-03-08 22:44:12 +0000285 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);
Kumar Sanghvib3d62552010-10-12 20:14:43 +0000291 }
Kumar Sanghvib3d62552010-10-12 20:14:43 +0000292
Rémi Denis-Courmont297edb62011-03-08 22:44:12 +0000293 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;
Kumar Sanghvib3d62552010-10-12 20:14:43 +0000300out:
301 release_sock(sk);
302 return err;
303}
Kumar Sanghvib3d62552010-10-12 20:14:43 +0000304
Rémi Denis-Courmont9995a322008-10-05 11:14:48 -0700305static 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
Rémi Denis-Courmontf7ae8d52011-03-08 22:44:10 +0000312 if (unlikely(sk->sk_state != TCP_LISTEN))
313 return -EINVAL;
314
Rémi Denis-Courmont9995a322008-10-05 11:14:48 -0700315 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
Remi Denis-Courmontba113a92008-09-22 20:05:19 -0700326static 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
Rémi Denis-Courmont9995a322008-10-05 11:14:48 -0700342static 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
Eric Dumazet43815482010-04-29 11:01:49 +0000349 poll_wait(file, sk_sleep(sk), wait);
Rémi Denis-Courmont9995a322008-10-05 11:14:48 -0700350
Rémi Denis-Courmontf7ae8d52011-03-08 22:44:10 +0000351 if (sk->sk_state == TCP_CLOSE)
Rémi Denis-Courmont9995a322008-10-05 11:14:48 -0700352 return POLLERR;
Rémi Denis-Courmont9995a322008-10-05 11:14:48 -0700353 if (!skb_queue_empty(&sk->sk_receive_queue))
354 mask |= POLLIN | POLLRDNORM;
Rémi Denis-Courmontc41bd97f82008-10-05 11:15:43 -0700355 if (!skb_queue_empty(&pn->ctrlreq_queue))
356 mask |= POLLPRI;
357 if (!mask && sk->sk_state == TCP_CLOSE_WAIT)
Rémi Denis-Courmont9995a322008-10-05 11:14:48 -0700358 return POLLHUP;
359
Rémi Denis-Courmont01b38602010-08-30 12:57:05 +0000360 if (sk->sk_state == TCP_ESTABLISHED &&
361 atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf &&
362 atomic_read(&pn->tx_credits))
Rémi Denis-Courmont9995a322008-10-05 11:14:48 -0700363 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
364
365 return mask;
366}
367
Remi Denis-Courmontba113a92008-09-22 20:05:19 -0700368static 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
Rémi Denis-Courmont9995a322008-10-05 11:14:48 -0700406static int pn_socket_listen(struct socket *sock, int backlog)
407{
408 struct sock *sk = sock->sk;
409 int err = 0;
410
Rémi Denis-Courmont9995a322008-10-05 11:14:48 -0700411 if (pn_socket_autobind(sock))
412 return -ENOBUFS;
413
414 lock_sock(sk);
Rémi Denis-Courmont96241542011-02-24 23:14:56 +0000415 if (sock->state != SS_UNCONNECTED) {
Rémi Denis-Courmont9995a322008-10-05 11:14:48 -0700416 err = -EINVAL;
417 goto out;
418 }
419
Rémi Denis-Courmont96241542011-02-24 23:14:56 +0000420 if (sk->sk_state != TCP_LISTEN) {
421 sk->sk_state = TCP_LISTEN;
422 sk->sk_ack_backlog = 0;
423 }
Rémi Denis-Courmont9995a322008-10-05 11:14:48 -0700424 sk->sk_max_ack_backlog = backlog;
425out:
426 release_sock(sk);
427 return err;
428}
429
Remi Denis-Courmontba113a92008-09-22 20:05:19 -0700430static 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
441const 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
Rémi Denis-Courmont9995a322008-10-05 11:14:48 -0700466const struct proto_ops phonet_stream_ops = {
467 .family = AF_PHONET,
468 .owner = THIS_MODULE,
469 .release = pn_socket_release,
470 .bind = pn_socket_bind,
Kumar Sanghvib3d62552010-10-12 20:14:43 +0000471 .connect = pn_socket_connect,
Rémi Denis-Courmont9995a322008-10-05 11:14:48 -0700472 .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,
Rémi Denis-Courmont02a47612008-10-05 11:16:16 -0700479 .setsockopt = sock_common_setsockopt,
480 .getsockopt = sock_common_getsockopt,
Rémi Denis-Courmont9995a322008-10-05 11:14:48 -0700481#ifdef CONFIG_COMPAT
Rémi Denis-Courmont02a47612008-10-05 11:16:16 -0700482 .compat_setsockopt = compat_sock_common_setsockopt,
483 .compat_getsockopt = compat_sock_common_getsockopt,
Rémi Denis-Courmont9995a322008-10-05 11:14:48 -0700484#endif
485 .sendmsg = pn_socket_sendmsg,
486 .recvmsg = sock_common_recvmsg,
487 .mmap = sock_no_mmap,
488 .sendpage = sock_no_sendpage,
489};
490EXPORT_SYMBOL(phonet_stream_ops);
491
Remi Denis-Courmontba113a92008-09-22 20:05:19 -0700492/* allocate port for a socket */
493int pn_sock_get_port(struct sock *sk, unsigned short sport)
494{
495 static int port_cur;
Rémi Denis-Courmont52404882008-12-03 15:42:56 -0800496 struct net *net = sock_net(sk);
Remi Denis-Courmontba113a92008-09-22 20:05:19 -0700497 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;
Rémi Denis-Courmont582b0b62009-09-23 03:17:10 +0000503 WARN_ON(!mutex_is_locked(&port_mutex));
Remi Denis-Courmontba113a92008-09-22 20:05:19 -0700504 if (!sport) {
505 /* search free port */
Remi Denis-Courmont87ab4e22008-09-22 20:08:39 -0700506 int port, pmin, pmax;
Remi Denis-Courmontba113a92008-09-22 20:05:19 -0700507
Remi Denis-Courmont87ab4e22008-09-22 20:08:39 -0700508 phonet_get_local_port_range(&pmin, &pmax);
Remi Denis-Courmontba113a92008-09-22 20:05:19 -0700509 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);
Rémi Denis-Courmont52404882008-12-03 15:42:56 -0800515 tmpsk = pn_find_sock_by_sa(net, &try_sa);
Remi Denis-Courmontba113a92008-09-22 20:05:19 -0700516 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);
Rémi Denis-Courmont52404882008-12-03 15:42:56 -0800525 tmpsk = pn_find_sock_by_sa(net, &try_sa);
Remi Denis-Courmontba113a92008-09-22 20:05:19 -0700526 if (tmpsk == NULL)
527 /* No sock there! We can use that port... */
528 goto found;
529 else
530 sock_put(tmpsk);
531 }
Remi Denis-Courmontba113a92008-09-22 20:05:19 -0700532 /* the port must be in use already */
533 return -EADDRINUSE;
534
535found:
Remi Denis-Courmontba113a92008-09-22 20:05:19 -0700536 pn->sobject = pn_object(pn_addr(pn->sobject), sport);
537 return 0;
538}
539EXPORT_SYMBOL(pn_sock_get_port);
Rémi Denis-Courmontc1dc13e2009-07-21 01:57:57 +0000540
Randy Dunlapae6e2ae2009-08-17 10:35:49 +0000541#ifdef CONFIG_PROC_FS
Rémi Denis-Courmontc1dc13e2009-07-21 01:57:57 +0000542static struct sock *pn_sock_get_idx(struct seq_file *seq, loff_t pos)
543{
544 struct net *net = seq_file_net(seq);
Rémi Denis-Courmont6b0d07b2009-11-09 02:17:01 +0000545 struct hlist_head *hlist = pnsocks.hlist;
Rémi Denis-Courmontc1dc13e2009-07-21 01:57:57 +0000546 struct hlist_node *node;
547 struct sock *sknode;
Rémi Denis-Courmont6b0d07b2009-11-09 02:17:01 +0000548 unsigned h;
Rémi Denis-Courmontc1dc13e2009-07-21 01:57:57 +0000549
Rémi Denis-Courmont6b0d07b2009-11-09 02:17:01 +0000550 for (h = 0; h < PN_HASHSIZE; h++) {
Rémi Denis-Courmont44f4d5a2011-04-12 23:27:36 +0000551 sk_for_each_rcu(sknode, node, hlist) {
Rémi Denis-Courmont6b0d07b2009-11-09 02:17:01 +0000552 if (!net_eq(net, sock_net(sknode)))
553 continue;
554 if (!pos)
555 return sknode;
556 pos--;
557 }
558 hlist++;
Rémi Denis-Courmontc1dc13e2009-07-21 01:57:57 +0000559 }
560 return NULL;
561}
562
563static 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
574static void *pn_sock_seq_start(struct seq_file *seq, loff_t *pos)
Rémi Denis-Courmont44f4d5a2011-04-12 23:27:36 +0000575 __acquires(rcu)
Rémi Denis-Courmontc1dc13e2009-07-21 01:57:57 +0000576{
Rémi Denis-Courmont44f4d5a2011-04-12 23:27:36 +0000577 rcu_read_lock();
Rémi Denis-Courmontc1dc13e2009-07-21 01:57:57 +0000578 return *pos ? pn_sock_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
579}
580
581static 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
593static void pn_sock_seq_stop(struct seq_file *seq, void *v)
Rémi Denis-Courmont44f4d5a2011-04-12 23:27:36 +0000594 __releases(rcu)
Rémi Denis-Courmontc1dc13e2009-07-21 01:57:57 +0000595{
Rémi Denis-Courmont44f4d5a2011-04-12 23:27:36 +0000596 rcu_read_unlock();
Rémi Denis-Courmontc1dc13e2009-07-21 01:57:57 +0000597}
598
599static 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 "
Dan Rosenberg71338aa2011-05-23 12:17:35 +0000611 "%d %pK %d%n",
Rémi Denis-Courmonta8059512011-02-24 23:14:57 +0000612 sk->sk_protocol, pn->sobject, pn->dobject,
613 pn->resource, sk->sk_state,
Rémi Denis-Courmontc1dc13e2009-07-21 01:57:57 +0000614 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
623static 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
630static int pn_sock_open(struct inode *inode, struct file *file)
631{
Rémi Denis-Courmontcb7d9e7f2009-08-11 03:12:07 +0000632 return seq_open_net(inode, file, &pn_sock_seq_ops,
633 sizeof(struct seq_net_private));
Rémi Denis-Courmontc1dc13e2009-07-21 01:57:57 +0000634}
635
636const struct file_operations pn_sock_seq_fops = {
637 .owner = THIS_MODULE,
638 .open = pn_sock_open,
639 .read = seq_read,
640 .llseek = seq_lseek,
Rémi Denis-Courmontcb7d9e7f2009-08-11 03:12:07 +0000641 .release = seq_release_net,
Rémi Denis-Courmontc1dc13e2009-07-21 01:57:57 +0000642};
Randy Dunlapae6e2ae2009-08-17 10:35:49 +0000643#endif
Rémi Denis-Courmont4e3d16c2010-09-15 12:30:11 +0000644
645static struct {
646 struct sock *sk[256];
647} pnres;
648
649/*
650 * Find and hold socket based on resource.
651 */
652struct 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
667static DEFINE_MUTEX(resource_mutex);
668
669int 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);
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +0000683 RCU_INIT_POINTER(pnres.sk[res], sk);
Rémi Denis-Courmont4e3d16c2010-09-15 12:30:11 +0000684 ret = 0;
685 }
686 mutex_unlock(&resource_mutex);
687 return ret;
688}
689
690int 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) {
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +0000699 RCU_INIT_POINTER(pnres.sk[res], NULL);
Rémi Denis-Courmont4e3d16c2010-09-15 12:30:11 +0000700 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
711void 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) {
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +0000718 RCU_INIT_POINTER(pnres.sk[res], NULL);
Rémi Denis-Courmont4e3d16c2010-09-15 12:30:11 +0000719 match++;
720 }
721 }
722 mutex_unlock(&resource_mutex);
723
Rémi Denis-Courmont4e3d16c2010-09-15 12:30:11 +0000724 while (match > 0) {
Rémi Denis-Courmont44f4d5a2011-04-12 23:27:36 +0000725 __sock_put(sk);
Rémi Denis-Courmont4e3d16c2010-09-15 12:30:11 +0000726 match--;
727 }
Rémi Denis-Courmont44f4d5a2011-04-12 23:27:36 +0000728 /* Caller is responsible for RCU sync before final sock_put() */
Rémi Denis-Courmont4e3d16c2010-09-15 12:30:11 +0000729}
Rémi Denis-Courmont507215f2010-09-15 12:30:14 +0000730
731#ifdef CONFIG_PROC_FS
732static 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
750static 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
763static 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
770static 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
782static void pn_res_seq_stop(struct seq_file *seq, void *v)
783 __releases(resource_mutex)
784{
785 mutex_unlock(&resource_mutex);
786}
787
788static 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",
David S. Miller9e0064a2010-09-15 21:34:41 -0700799 (int) (psk - pnres.sk), sock_i_uid(sk),
800 sock_i_ino(sk), &len);
Rémi Denis-Courmont507215f2010-09-15 12:30:14 +0000801 }
802 seq_printf(seq, "%*s\n", 63 - len, "");
803 return 0;
804}
805
806static 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
813static 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
819const 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