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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * An implementation of the Acorn Econet and AUN protocols. | |
3 | * Philip Blundell <philb@gnu.org> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU General Public License | |
7 | * as published by the Free Software Foundation; either version | |
8 | * 2 of the License, or (at your option) any later version. | |
9 | * | |
10 | */ | |
11 | ||
ee9c88f2 JP |
12 | #define pr_fmt(fmt) fmt |
13 | ||
1da177e4 LT |
14 | #include <linux/module.h> |
15 | ||
16 | #include <linux/types.h> | |
17 | #include <linux/kernel.h> | |
1da177e4 LT |
18 | #include <linux/string.h> |
19 | #include <linux/mm.h> | |
20 | #include <linux/socket.h> | |
21 | #include <linux/sockios.h> | |
22 | #include <linux/in.h> | |
23 | #include <linux/errno.h> | |
24 | #include <linux/interrupt.h> | |
25 | #include <linux/if_ether.h> | |
26 | #include <linux/netdevice.h> | |
27 | #include <linux/inetdevice.h> | |
28 | #include <linux/route.h> | |
29 | #include <linux/inet.h> | |
30 | #include <linux/etherdevice.h> | |
31 | #include <linux/if_arp.h> | |
32 | #include <linux/wireless.h> | |
33 | #include <linux/skbuff.h> | |
14c85021 | 34 | #include <linux/udp.h> |
5a0e3ad6 | 35 | #include <linux/slab.h> |
a27e13d3 | 36 | #include <linux/vmalloc.h> |
1da177e4 LT |
37 | #include <net/sock.h> |
38 | #include <net/inet_common.h> | |
39 | #include <linux/stat.h> | |
40 | #include <linux/init.h> | |
41 | #include <linux/if_ec.h> | |
42 | #include <net/udp.h> | |
43 | #include <net/ip.h> | |
44 | #include <linux/spinlock.h> | |
45 | #include <linux/rcupdate.h> | |
46 | #include <linux/bitops.h> | |
1d181831 | 47 | #include <linux/mutex.h> |
1da177e4 | 48 | |
ee9c88f2 | 49 | #include <linux/uaccess.h> |
1da177e4 | 50 | |
90ddc4f0 | 51 | static const struct proto_ops econet_ops; |
1da177e4 | 52 | static struct hlist_head econet_sklist; |
0c78a92f | 53 | static DEFINE_SPINLOCK(econet_lock); |
1d181831 | 54 | static DEFINE_MUTEX(econet_mutex); |
1da177e4 LT |
55 | |
56 | /* Since there are only 256 possible network numbers (or fewer, depends | |
57 | how you count) it makes sense to use a simple lookup table. */ | |
58 | static struct net_device *net2dev_map[256]; | |
59 | ||
60 | #define EC_PORT_IP 0xd2 | |
61 | ||
62 | #ifdef CONFIG_ECONET_AUNUDP | |
ca403302 | 63 | static DEFINE_SPINLOCK(aun_queue_lock); |
1da177e4 LT |
64 | static struct socket *udpsock; |
65 | #define AUN_PORT 0x8000 | |
66 | ||
ee9c88f2 | 67 | struct aunhdr { |
1da177e4 LT |
68 | unsigned char code; /* AUN magic protocol byte */ |
69 | unsigned char port; | |
70 | unsigned char cb; | |
71 | unsigned char pad; | |
72 | unsigned long handle; | |
73 | }; | |
74 | ||
75 | static unsigned long aun_seq; | |
76 | ||
77 | /* Queue of packets waiting to be transmitted. */ | |
78 | static struct sk_buff_head aun_queue; | |
79 | static struct timer_list ab_cleanup_timer; | |
80 | ||
81 | #endif /* CONFIG_ECONET_AUNUDP */ | |
82 | ||
83 | /* Per-packet information */ | |
ee9c88f2 | 84 | struct ec_cb { |
1da177e4 LT |
85 | struct sockaddr_ec sec; |
86 | unsigned long cookie; /* Supplied by user. */ | |
87 | #ifdef CONFIG_ECONET_AUNUDP | |
88 | int done; | |
89 | unsigned long seq; /* Sequencing */ | |
90 | unsigned long timeout; /* Timeout */ | |
91 | unsigned long start; /* jiffies */ | |
92 | #endif | |
93 | #ifdef CONFIG_ECONET_NATIVE | |
94 | void (*sent)(struct sk_buff *, int result); | |
95 | #endif | |
96 | }; | |
97 | ||
98 | static void econet_remove_socket(struct hlist_head *list, struct sock *sk) | |
99 | { | |
0c78a92f | 100 | spin_lock_bh(&econet_lock); |
1da177e4 | 101 | sk_del_node_init(sk); |
0c78a92f | 102 | spin_unlock_bh(&econet_lock); |
1da177e4 LT |
103 | } |
104 | ||
105 | static void econet_insert_socket(struct hlist_head *list, struct sock *sk) | |
106 | { | |
0c78a92f | 107 | spin_lock_bh(&econet_lock); |
1da177e4 | 108 | sk_add_node(sk, list); |
0c78a92f | 109 | spin_unlock_bh(&econet_lock); |
1da177e4 LT |
110 | } |
111 | ||
112 | /* | |
113 | * Pull a packet from our receive queue and hand it to the user. | |
114 | * If necessary we block. | |
115 | */ | |
116 | ||
117 | static int econet_recvmsg(struct kiocb *iocb, struct socket *sock, | |
118 | struct msghdr *msg, size_t len, int flags) | |
119 | { | |
120 | struct sock *sk = sock->sk; | |
121 | struct sk_buff *skb; | |
122 | size_t copied; | |
123 | int err; | |
124 | ||
125 | msg->msg_namelen = sizeof(struct sockaddr_ec); | |
126 | ||
1d181831 DM |
127 | mutex_lock(&econet_mutex); |
128 | ||
1da177e4 LT |
129 | /* |
130 | * Call the generic datagram receiver. This handles all sorts | |
131 | * of horrible races and re-entrancy so we can forget about it | |
132 | * in the protocol layers. | |
133 | * | |
134 | * Now it will return ENETDOWN, if device have just gone down, | |
135 | * but then it will block. | |
136 | */ | |
137 | ||
ee9c88f2 | 138 | skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err); |
1da177e4 LT |
139 | |
140 | /* | |
c9b6aab9 | 141 | * An error occurred so return it. Because skb_recv_datagram() |
1da177e4 LT |
142 | * handles the blocking we don't see and worry about blocking |
143 | * retries. | |
144 | */ | |
145 | ||
ee9c88f2 | 146 | if (skb == NULL) |
1da177e4 LT |
147 | goto out; |
148 | ||
149 | /* | |
150 | * You lose any data beyond the buffer you gave. If it worries a | |
151 | * user program they can ask the device for its MTU anyway. | |
152 | */ | |
153 | ||
154 | copied = skb->len; | |
ee9c88f2 JP |
155 | if (copied > len) { |
156 | copied = len; | |
157 | msg->msg_flags |= MSG_TRUNC; | |
1da177e4 LT |
158 | } |
159 | ||
160 | /* We can't use skb_copy_datagram here */ | |
161 | err = memcpy_toiovec(msg->msg_iov, skb->data, copied); | |
162 | if (err) | |
163 | goto out_free; | |
b7aa0bf7 | 164 | sk->sk_stamp = skb->tstamp; |
1da177e4 LT |
165 | |
166 | if (msg->msg_name) | |
167 | memcpy(msg->msg_name, skb->cb, msg->msg_namelen); | |
168 | ||
169 | /* | |
170 | * Free or return the buffer as appropriate. Again this | |
171 | * hides all the races and re-entrancy issues from us. | |
172 | */ | |
173 | err = copied; | |
174 | ||
175 | out_free: | |
176 | skb_free_datagram(sk, skb); | |
177 | out: | |
1d181831 | 178 | mutex_unlock(&econet_mutex); |
1da177e4 LT |
179 | return err; |
180 | } | |
181 | ||
182 | /* | |
183 | * Bind an Econet socket. | |
184 | */ | |
185 | ||
ee9c88f2 JP |
186 | static int econet_bind(struct socket *sock, struct sockaddr *uaddr, |
187 | int addr_len) | |
1da177e4 LT |
188 | { |
189 | struct sockaddr_ec *sec = (struct sockaddr_ec *)uaddr; | |
1d181831 DM |
190 | struct sock *sk; |
191 | struct econet_sock *eo; | |
c9b6aab9 | 192 | |
1da177e4 LT |
193 | /* |
194 | * Check legality | |
195 | */ | |
c9b6aab9 | 196 | |
1da177e4 LT |
197 | if (addr_len < sizeof(struct sockaddr_ec) || |
198 | sec->sec_family != AF_ECONET) | |
199 | return -EINVAL; | |
c9b6aab9 | 200 | |
1d181831 DM |
201 | mutex_lock(&econet_mutex); |
202 | ||
203 | sk = sock->sk; | |
204 | eo = ec_sk(sk); | |
205 | ||
1da177e4 LT |
206 | eo->cb = sec->cb; |
207 | eo->port = sec->port; | |
208 | eo->station = sec->addr.station; | |
209 | eo->net = sec->addr.net; | |
210 | ||
1d181831 DM |
211 | mutex_unlock(&econet_mutex); |
212 | ||
1da177e4 LT |
213 | return 0; |
214 | } | |
215 | ||
216 | #if defined(CONFIG_ECONET_AUNUDP) || defined(CONFIG_ECONET_NATIVE) | |
217 | /* | |
218 | * Queue a transmit result for the user to be told about. | |
219 | */ | |
220 | ||
221 | static void tx_result(struct sock *sk, unsigned long cookie, int result) | |
222 | { | |
223 | struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC); | |
224 | struct ec_cb *eb; | |
225 | struct sockaddr_ec *sec; | |
226 | ||
ee9c88f2 JP |
227 | if (skb == NULL) { |
228 | pr_debug("econet: memory squeeze, transmit result dropped\n"); | |
1da177e4 LT |
229 | return; |
230 | } | |
231 | ||
232 | eb = (struct ec_cb *)&skb->cb; | |
233 | sec = (struct sockaddr_ec *)&eb->sec; | |
234 | memset(sec, 0, sizeof(struct sockaddr_ec)); | |
235 | sec->cookie = cookie; | |
236 | sec->type = ECTYPE_TRANSMIT_STATUS | result; | |
237 | sec->sec_family = AF_ECONET; | |
238 | ||
239 | if (sock_queue_rcv_skb(sk, skb) < 0) | |
240 | kfree_skb(skb); | |
241 | } | |
242 | #endif | |
243 | ||
244 | #ifdef CONFIG_ECONET_NATIVE | |
245 | /* | |
246 | * Called by the Econet hardware driver when a packet transmit | |
247 | * has completed. Tell the user. | |
248 | */ | |
249 | ||
250 | static void ec_tx_done(struct sk_buff *skb, int result) | |
251 | { | |
252 | struct ec_cb *eb = (struct ec_cb *)&skb->cb; | |
253 | tx_result(skb->sk, eb->cookie, result); | |
254 | } | |
255 | #endif | |
256 | ||
257 | /* | |
258 | * Send a packet. We have to work out which device it's going out on | |
259 | * and hence whether to use real Econet or the UDP emulation. | |
260 | */ | |
261 | ||
262 | static int econet_sendmsg(struct kiocb *iocb, struct socket *sock, | |
263 | struct msghdr *msg, size_t len) | |
264 | { | |
ee9c88f2 | 265 | struct sockaddr_ec *saddr = (struct sockaddr_ec *)msg->msg_name; |
1da177e4 LT |
266 | struct net_device *dev; |
267 | struct ec_addr addr; | |
268 | int err; | |
269 | unsigned char port, cb; | |
270 | #if defined(CONFIG_ECONET_AUNUDP) || defined(CONFIG_ECONET_NATIVE) | |
389f2a18 | 271 | struct sock *sk = sock->sk; |
1da177e4 LT |
272 | struct sk_buff *skb; |
273 | struct ec_cb *eb; | |
274 | #endif | |
275 | #ifdef CONFIG_ECONET_AUNUDP | |
276 | struct msghdr udpmsg; | |
a27e13d3 | 277 | struct iovec iov[2]; |
1da177e4 LT |
278 | struct aunhdr ah; |
279 | struct sockaddr_in udpdest; | |
280 | __kernel_size_t size; | |
1da177e4 | 281 | mm_segment_t oldfs; |
a27e13d3 | 282 | char *userbuf; |
1da177e4 | 283 | #endif |
c9b6aab9 | 284 | |
1da177e4 | 285 | /* |
c9b6aab9 | 286 | * Check the flags. |
1da177e4 LT |
287 | */ |
288 | ||
c9b6aab9 | 289 | if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT)) |
1da177e4 LT |
290 | return -EINVAL; |
291 | ||
292 | /* | |
c9b6aab9 | 293 | * Get and verify the address. |
1da177e4 | 294 | */ |
c9b6aab9 | 295 | |
1d181831 DM |
296 | mutex_lock(&econet_mutex); |
297 | ||
ee9c88f2 JP |
298 | if (saddr == NULL || msg->msg_namelen < sizeof(struct sockaddr_ec)) { |
299 | mutex_unlock(&econet_mutex); | |
300 | return -EINVAL; | |
301 | } | |
302 | addr.station = saddr->addr.station; | |
303 | addr.net = saddr->addr.net; | |
304 | port = saddr->port; | |
305 | cb = saddr->cb; | |
1da177e4 LT |
306 | |
307 | /* Look for a device with the right network number. */ | |
308 | dev = net2dev_map[addr.net]; | |
309 | ||
310 | /* If not directly reachable, use some default */ | |
1d181831 | 311 | if (dev == NULL) { |
1da177e4 LT |
312 | dev = net2dev_map[0]; |
313 | /* No interfaces at all? */ | |
1d181831 DM |
314 | if (dev == NULL) { |
315 | mutex_unlock(&econet_mutex); | |
1da177e4 | 316 | return -ENETDOWN; |
1d181831 | 317 | } |
1da177e4 LT |
318 | } |
319 | ||
1d181831 | 320 | if (dev->type == ARPHRD_ECONET) { |
1da177e4 LT |
321 | /* Real hardware Econet. We're not worthy etc. */ |
322 | #ifdef CONFIG_ECONET_NATIVE | |
323 | unsigned short proto = 0; | |
ae641949 | 324 | int hlen, tlen; |
0c4e8581 | 325 | int res; |
1da177e4 | 326 | |
a27e13d3 PB |
327 | if (len + 15 > dev->mtu) { |
328 | mutex_unlock(&econet_mutex); | |
329 | return -EMSGSIZE; | |
330 | } | |
331 | ||
1da177e4 | 332 | dev_hold(dev); |
c9b6aab9 | 333 | |
ae641949 HX |
334 | hlen = LL_RESERVED_SPACE(dev); |
335 | tlen = dev->needed_tailroom; | |
336 | skb = sock_alloc_send_skb(sk, len + hlen + tlen, | |
1da177e4 | 337 | msg->msg_flags & MSG_DONTWAIT, &err); |
ee9c88f2 | 338 | if (skb == NULL) |
1da177e4 | 339 | goto out_unlock; |
c9b6aab9 | 340 | |
ae641949 | 341 | skb_reserve(skb, hlen); |
c1d2bbe1 | 342 | skb_reset_network_header(skb); |
c9b6aab9 | 343 | |
1da177e4 | 344 | eb = (struct ec_cb *)&skb->cb; |
c9b6aab9 | 345 | |
1da177e4 LT |
346 | eb->cookie = saddr->cookie; |
347 | eb->sec = *saddr; | |
348 | eb->sent = ec_tx_done; | |
349 | ||
0c4e8581 SH |
350 | err = -EINVAL; |
351 | res = dev_hard_header(skb, dev, ntohs(proto), &addr, NULL, len); | |
352 | if (res < 0) | |
353 | goto out_free; | |
354 | if (res > 0) { | |
1da177e4 | 355 | struct ec_framehdr *fh; |
1da177e4 LT |
356 | /* Poke in our control byte and |
357 | port number. Hack, hack. */ | |
ee9c88f2 | 358 | fh = (struct ec_framehdr *)skb->data; |
1da177e4 LT |
359 | fh->cb = cb; |
360 | fh->port = port; | |
361 | if (sock->type != SOCK_DGRAM) { | |
27a884dc | 362 | skb_reset_tail_pointer(skb); |
1da177e4 | 363 | skb->len = 0; |
0c4e8581 | 364 | } |
1da177e4 | 365 | } |
c9b6aab9 | 366 | |
1da177e4 | 367 | /* Copy the data. Returns -EFAULT on error */ |
ee9c88f2 | 368 | err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); |
1da177e4 LT |
369 | skb->protocol = proto; |
370 | skb->dev = dev; | |
371 | skb->priority = sk->sk_priority; | |
372 | if (err) | |
373 | goto out_free; | |
c9b6aab9 | 374 | |
1da177e4 LT |
375 | err = -ENETDOWN; |
376 | if (!(dev->flags & IFF_UP)) | |
377 | goto out_free; | |
c9b6aab9 | 378 | |
1da177e4 LT |
379 | /* |
380 | * Now send it | |
381 | */ | |
c9b6aab9 | 382 | |
1da177e4 LT |
383 | dev_queue_xmit(skb); |
384 | dev_put(dev); | |
1d181831 | 385 | mutex_unlock(&econet_mutex); |
a02cec21 | 386 | return len; |
1da177e4 | 387 | |
ee9c88f2 | 388 | out_free: |
1da177e4 | 389 | kfree_skb(skb); |
ee9c88f2 | 390 | out_unlock: |
1da177e4 LT |
391 | if (dev) |
392 | dev_put(dev); | |
393 | #else | |
394 | err = -EPROTOTYPE; | |
395 | #endif | |
1d181831 DM |
396 | mutex_unlock(&econet_mutex); |
397 | ||
1da177e4 LT |
398 | return err; |
399 | } | |
400 | ||
401 | #ifdef CONFIG_ECONET_AUNUDP | |
402 | /* AUN virtual Econet. */ | |
403 | ||
1d181831 DM |
404 | if (udpsock == NULL) { |
405 | mutex_unlock(&econet_mutex); | |
1da177e4 | 406 | return -ENETDOWN; /* No socket - can't send */ |
1d181831 | 407 | } |
c9b6aab9 | 408 | |
a27e13d3 PB |
409 | if (len > 32768) { |
410 | err = -E2BIG; | |
411 | goto error; | |
412 | } | |
413 | ||
1da177e4 LT |
414 | /* Make up a UDP datagram and hand it off to some higher intellect. */ |
415 | ||
416 | memset(&udpdest, 0, sizeof(udpdest)); | |
417 | udpdest.sin_family = AF_INET; | |
418 | udpdest.sin_port = htons(AUN_PORT); | |
419 | ||
420 | /* At the moment we use the stupid Acorn scheme of Econet address | |
421 | y.x maps to IP a.b.c.x. This should be replaced with something | |
422 | more flexible and more aware of subnet masks. */ | |
423 | { | |
424 | struct in_device *idev; | |
425 | unsigned long network = 0; | |
426 | ||
427 | rcu_read_lock(); | |
e5ed6399 | 428 | idev = __in_dev_get_rcu(dev); |
1da177e4 LT |
429 | if (idev) { |
430 | if (idev->ifa_list) | |
c9b6aab9 | 431 | network = ntohl(idev->ifa_list->ifa_address) & |
1da177e4 LT |
432 | 0xffffff00; /* !!! */ |
433 | } | |
434 | rcu_read_unlock(); | |
435 | udpdest.sin_addr.s_addr = htonl(network | addr.station); | |
436 | } | |
437 | ||
67c5c6cb | 438 | memset(&ah, 0, sizeof(ah)); |
1da177e4 LT |
439 | ah.port = port; |
440 | ah.cb = cb & 0x7f; | |
441 | ah.code = 2; /* magic */ | |
1da177e4 LT |
442 | |
443 | /* tack our header on the front of the iovec */ | |
444 | size = sizeof(struct aunhdr); | |
1da177e4 LT |
445 | iov[0].iov_base = (void *)&ah; |
446 | iov[0].iov_len = size; | |
a27e13d3 PB |
447 | |
448 | userbuf = vmalloc(len); | |
449 | if (userbuf == NULL) { | |
450 | err = -ENOMEM; | |
451 | goto error; | |
1da177e4 LT |
452 | } |
453 | ||
a27e13d3 PB |
454 | iov[1].iov_base = userbuf; |
455 | iov[1].iov_len = len; | |
456 | err = memcpy_fromiovec(userbuf, msg->msg_iov, len); | |
457 | if (err) | |
458 | goto error_free_buf; | |
459 | ||
1da177e4 | 460 | /* Get a skbuff (no data, just holds our cb information) */ |
ee9c88f2 JP |
461 | skb = sock_alloc_send_skb(sk, 0, msg->msg_flags & MSG_DONTWAIT, &err); |
462 | if (skb == NULL) | |
a27e13d3 | 463 | goto error_free_buf; |
1da177e4 LT |
464 | |
465 | eb = (struct ec_cb *)&skb->cb; | |
466 | ||
467 | eb->cookie = saddr->cookie; | |
ee9c88f2 | 468 | eb->timeout = 5 * HZ; |
1da177e4 LT |
469 | eb->start = jiffies; |
470 | ah.handle = aun_seq; | |
471 | eb->seq = (aun_seq++); | |
472 | eb->sec = *saddr; | |
473 | ||
474 | skb_queue_tail(&aun_queue, skb); | |
475 | ||
476 | udpmsg.msg_name = (void *)&udpdest; | |
477 | udpmsg.msg_namelen = sizeof(udpdest); | |
478 | udpmsg.msg_iov = &iov[0]; | |
a27e13d3 | 479 | udpmsg.msg_iovlen = 2; |
1da177e4 LT |
480 | udpmsg.msg_control = NULL; |
481 | udpmsg.msg_controllen = 0; | |
ee9c88f2 | 482 | udpmsg.msg_flags = 0; |
1da177e4 | 483 | |
ee9c88f2 JP |
484 | oldfs = get_fs(); |
485 | set_fs(KERNEL_DS); /* More privs :-) */ | |
1da177e4 LT |
486 | err = sock_sendmsg(udpsock, &udpmsg, size); |
487 | set_fs(oldfs); | |
a27e13d3 PB |
488 | |
489 | error_free_buf: | |
490 | vfree(userbuf); | |
389f2a18 | 491 | error: |
1da177e4 LT |
492 | #else |
493 | err = -EPROTOTYPE; | |
494 | #endif | |
1d181831 DM |
495 | mutex_unlock(&econet_mutex); |
496 | ||
1da177e4 LT |
497 | return err; |
498 | } | |
499 | ||
500 | /* | |
501 | * Look up the address of a socket. | |
502 | */ | |
503 | ||
504 | static int econet_getname(struct socket *sock, struct sockaddr *uaddr, | |
505 | int *uaddr_len, int peer) | |
506 | { | |
1d181831 DM |
507 | struct sock *sk; |
508 | struct econet_sock *eo; | |
1da177e4 LT |
509 | struct sockaddr_ec *sec = (struct sockaddr_ec *)uaddr; |
510 | ||
511 | if (peer) | |
512 | return -EOPNOTSUPP; | |
513 | ||
80922bbb | 514 | memset(sec, 0, sizeof(*sec)); |
1d181831 DM |
515 | mutex_lock(&econet_mutex); |
516 | ||
517 | sk = sock->sk; | |
518 | eo = ec_sk(sk); | |
519 | ||
1da177e4 LT |
520 | sec->sec_family = AF_ECONET; |
521 | sec->port = eo->port; | |
522 | sec->addr.station = eo->station; | |
523 | sec->addr.net = eo->net; | |
524 | ||
1d181831 DM |
525 | mutex_unlock(&econet_mutex); |
526 | ||
1da177e4 LT |
527 | *uaddr_len = sizeof(*sec); |
528 | return 0; | |
529 | } | |
530 | ||
531 | static void econet_destroy_timer(unsigned long data) | |
532 | { | |
ee9c88f2 | 533 | struct sock *sk = (struct sock *)data; |
1da177e4 | 534 | |
c564039f | 535 | if (!sk_has_allocations(sk)) { |
1da177e4 LT |
536 | sk_free(sk); |
537 | return; | |
538 | } | |
539 | ||
540 | sk->sk_timer.expires = jiffies + 10 * HZ; | |
541 | add_timer(&sk->sk_timer); | |
ee9c88f2 | 542 | pr_debug("econet: socket destroy delayed\n"); |
1da177e4 LT |
543 | } |
544 | ||
545 | /* | |
546 | * Close an econet socket. | |
547 | */ | |
548 | ||
549 | static int econet_release(struct socket *sock) | |
550 | { | |
1d181831 | 551 | struct sock *sk; |
1da177e4 | 552 | |
1d181831 DM |
553 | mutex_lock(&econet_mutex); |
554 | ||
555 | sk = sock->sk; | |
1da177e4 | 556 | if (!sk) |
1d181831 | 557 | goto out_unlock; |
1da177e4 LT |
558 | |
559 | econet_remove_socket(&econet_sklist, sk); | |
560 | ||
561 | /* | |
562 | * Now the socket is dead. No more input will appear. | |
563 | */ | |
564 | ||
565 | sk->sk_state_change(sk); /* It is useless. Just for sanity. */ | |
566 | ||
0efffaf9 | 567 | sock_orphan(sk); |
1da177e4 LT |
568 | |
569 | /* Purge queues */ | |
570 | ||
571 | skb_queue_purge(&sk->sk_receive_queue); | |
572 | ||
c564039f | 573 | if (sk_has_allocations(sk)) { |
1da177e4 LT |
574 | sk->sk_timer.data = (unsigned long)sk; |
575 | sk->sk_timer.expires = jiffies + HZ; | |
576 | sk->sk_timer.function = econet_destroy_timer; | |
577 | add_timer(&sk->sk_timer); | |
1d181831 DM |
578 | |
579 | goto out_unlock; | |
1da177e4 LT |
580 | } |
581 | ||
582 | sk_free(sk); | |
1d181831 DM |
583 | |
584 | out_unlock: | |
585 | mutex_unlock(&econet_mutex); | |
1da177e4 LT |
586 | return 0; |
587 | } | |
588 | ||
589 | static struct proto econet_proto = { | |
590 | .name = "ECONET", | |
591 | .owner = THIS_MODULE, | |
592 | .obj_size = sizeof(struct econet_sock), | |
593 | }; | |
594 | ||
595 | /* | |
596 | * Create an Econet socket | |
597 | */ | |
598 | ||
3f378b68 EP |
599 | static int econet_create(struct net *net, struct socket *sock, int protocol, |
600 | int kern) | |
1da177e4 LT |
601 | { |
602 | struct sock *sk; | |
603 | struct econet_sock *eo; | |
604 | int err; | |
605 | ||
09ad9bc7 | 606 | if (!net_eq(net, &init_net)) |
1b8d7ae4 EB |
607 | return -EAFNOSUPPORT; |
608 | ||
1da177e4 LT |
609 | /* Econet only provides datagram services. */ |
610 | if (sock->type != SOCK_DGRAM) | |
611 | return -ESOCKTNOSUPPORT; | |
612 | ||
613 | sock->state = SS_UNCONNECTED; | |
614 | ||
615 | err = -ENOBUFS; | |
6257ff21 | 616 | sk = sk_alloc(net, PF_ECONET, GFP_KERNEL, &econet_proto); |
1da177e4 LT |
617 | if (sk == NULL) |
618 | goto out; | |
619 | ||
4a17fd52 | 620 | sk->sk_reuse = SK_CAN_REUSE; |
1da177e4 LT |
621 | sock->ops = &econet_ops; |
622 | sock_init_data(sock, sk); | |
623 | ||
624 | eo = ec_sk(sk); | |
625 | sock_reset_flag(sk, SOCK_ZAPPED); | |
626 | sk->sk_family = PF_ECONET; | |
627 | eo->num = protocol; | |
628 | ||
629 | econet_insert_socket(&econet_sklist, sk); | |
a02cec21 | 630 | return 0; |
1da177e4 LT |
631 | out: |
632 | return err; | |
633 | } | |
634 | ||
635 | /* | |
636 | * Handle Econet specific ioctls | |
637 | */ | |
638 | ||
639 | static int ec_dev_ioctl(struct socket *sock, unsigned int cmd, void __user *arg) | |
640 | { | |
641 | struct ifreq ifr; | |
642 | struct ec_device *edev; | |
643 | struct net_device *dev; | |
644 | struct sockaddr_ec *sec; | |
1d181831 | 645 | int err; |
1da177e4 LT |
646 | |
647 | /* | |
648 | * Fetch the caller's info block into kernel space | |
649 | */ | |
650 | ||
651 | if (copy_from_user(&ifr, arg, sizeof(struct ifreq))) | |
652 | return -EFAULT; | |
653 | ||
ee9c88f2 JP |
654 | dev = dev_get_by_name(&init_net, ifr.ifr_name); |
655 | if (dev == NULL) | |
1da177e4 LT |
656 | return -ENODEV; |
657 | ||
658 | sec = (struct sockaddr_ec *)&ifr.ifr_addr; | |
659 | ||
1d181831 DM |
660 | mutex_lock(&econet_mutex); |
661 | ||
662 | err = 0; | |
663 | switch (cmd) { | |
1da177e4 | 664 | case SIOCSIFADDR: |
0c62fc6d NE |
665 | if (!capable(CAP_NET_ADMIN)) { |
666 | err = -EPERM; | |
667 | break; | |
668 | } | |
16c41745 | 669 | |
1da177e4 | 670 | edev = dev->ec_ptr; |
1d181831 | 671 | if (edev == NULL) { |
1da177e4 | 672 | /* Magic up a new one. */ |
0da974f4 | 673 | edev = kzalloc(sizeof(struct ec_device), GFP_KERNEL); |
1da177e4 | 674 | if (edev == NULL) { |
1d181831 DM |
675 | err = -ENOMEM; |
676 | break; | |
1da177e4 | 677 | } |
1da177e4 | 678 | dev->ec_ptr = edev; |
1d181831 | 679 | } else |
1da177e4 LT |
680 | net2dev_map[edev->net] = NULL; |
681 | edev->station = sec->addr.station; | |
682 | edev->net = sec->addr.net; | |
683 | net2dev_map[sec->addr.net] = dev; | |
684 | if (!net2dev_map[0]) | |
685 | net2dev_map[0] = dev; | |
1d181831 | 686 | break; |
1da177e4 LT |
687 | |
688 | case SIOCGIFADDR: | |
689 | edev = dev->ec_ptr; | |
1d181831 DM |
690 | if (edev == NULL) { |
691 | err = -ENODEV; | |
692 | break; | |
1da177e4 LT |
693 | } |
694 | memset(sec, 0, sizeof(struct sockaddr_ec)); | |
695 | sec->addr.station = edev->station; | |
696 | sec->addr.net = edev->net; | |
697 | sec->sec_family = AF_ECONET; | |
698 | dev_put(dev); | |
699 | if (copy_to_user(arg, &ifr, sizeof(struct ifreq))) | |
1d181831 DM |
700 | err = -EFAULT; |
701 | break; | |
702 | ||
703 | default: | |
704 | err = -EINVAL; | |
705 | break; | |
1da177e4 LT |
706 | } |
707 | ||
1d181831 DM |
708 | mutex_unlock(&econet_mutex); |
709 | ||
1da177e4 | 710 | dev_put(dev); |
1d181831 DM |
711 | |
712 | return err; | |
1da177e4 LT |
713 | } |
714 | ||
715 | /* | |
716 | * Handle generic ioctls | |
717 | */ | |
718 | ||
ee9c88f2 JP |
719 | static int econet_ioctl(struct socket *sock, unsigned int cmd, |
720 | unsigned long arg) | |
1da177e4 LT |
721 | { |
722 | struct sock *sk = sock->sk; | |
723 | void __user *argp = (void __user *)arg; | |
724 | ||
075e1913 JP |
725 | switch (cmd) { |
726 | case SIOCGSTAMP: | |
727 | return sock_get_timestamp(sk, argp); | |
1da177e4 | 728 | |
075e1913 JP |
729 | case SIOCGSTAMPNS: |
730 | return sock_get_timestampns(sk, argp); | |
ae40eb1e | 731 | |
075e1913 JP |
732 | case SIOCSIFADDR: |
733 | case SIOCGIFADDR: | |
734 | return ec_dev_ioctl(sock, cmd, argp); | |
1da177e4 | 735 | |
1da177e4 | 736 | } |
075e1913 JP |
737 | |
738 | return -ENOIOCTLCMD; | |
1da177e4 LT |
739 | } |
740 | ||
ec1b4cf7 | 741 | static const struct net_proto_family econet_family_ops = { |
1da177e4 LT |
742 | .family = PF_ECONET, |
743 | .create = econet_create, | |
744 | .owner = THIS_MODULE, | |
745 | }; | |
746 | ||
1d181831 | 747 | static const struct proto_ops econet_ops = { |
1da177e4 LT |
748 | .family = PF_ECONET, |
749 | .owner = THIS_MODULE, | |
750 | .release = econet_release, | |
751 | .bind = econet_bind, | |
752 | .connect = sock_no_connect, | |
753 | .socketpair = sock_no_socketpair, | |
754 | .accept = sock_no_accept, | |
c9b6aab9 | 755 | .getname = econet_getname, |
1da177e4 LT |
756 | .poll = datagram_poll, |
757 | .ioctl = econet_ioctl, | |
758 | .listen = sock_no_listen, | |
759 | .shutdown = sock_no_shutdown, | |
760 | .setsockopt = sock_no_setsockopt, | |
761 | .getsockopt = sock_no_getsockopt, | |
762 | .sendmsg = econet_sendmsg, | |
763 | .recvmsg = econet_recvmsg, | |
764 | .mmap = sock_no_mmap, | |
765 | .sendpage = sock_no_sendpage, | |
766 | }; | |
767 | ||
1da177e4 LT |
768 | #if defined(CONFIG_ECONET_AUNUDP) || defined(CONFIG_ECONET_NATIVE) |
769 | /* | |
770 | * Find the listening socket, if any, for the given data. | |
771 | */ | |
772 | ||
773 | static struct sock *ec_listening_socket(unsigned char port, unsigned char | |
774 | station, unsigned char net) | |
775 | { | |
776 | struct sock *sk; | |
777 | struct hlist_node *node; | |
778 | ||
0c78a92f | 779 | spin_lock(&econet_lock); |
1da177e4 LT |
780 | sk_for_each(sk, node, &econet_sklist) { |
781 | struct econet_sock *opt = ec_sk(sk); | |
c9b6aab9 | 782 | if ((opt->port == port || opt->port == 0) && |
1da177e4 | 783 | (opt->station == station || opt->station == 0) && |
0c78a92f ED |
784 | (opt->net == net || opt->net == 0)) { |
785 | sock_hold(sk); | |
1da177e4 | 786 | goto found; |
0c78a92f | 787 | } |
1da177e4 LT |
788 | } |
789 | sk = NULL; | |
790 | found: | |
0c78a92f | 791 | spin_unlock(&econet_lock); |
1da177e4 LT |
792 | return sk; |
793 | } | |
794 | ||
795 | /* | |
796 | * Queue a received packet for a socket. | |
797 | */ | |
798 | ||
799 | static int ec_queue_packet(struct sock *sk, struct sk_buff *skb, | |
800 | unsigned char stn, unsigned char net, | |
801 | unsigned char cb, unsigned char port) | |
802 | { | |
803 | struct ec_cb *eb = (struct ec_cb *)&skb->cb; | |
804 | struct sockaddr_ec *sec = (struct sockaddr_ec *)&eb->sec; | |
805 | ||
806 | memset(sec, 0, sizeof(struct sockaddr_ec)); | |
807 | sec->sec_family = AF_ECONET; | |
808 | sec->type = ECTYPE_PACKET_RECEIVED; | |
809 | sec->port = port; | |
810 | sec->cb = cb; | |
811 | sec->addr.net = net; | |
812 | sec->addr.station = stn; | |
813 | ||
814 | return sock_queue_rcv_skb(sk, skb); | |
815 | } | |
816 | #endif | |
817 | ||
818 | #ifdef CONFIG_ECONET_AUNUDP | |
819 | /* | |
c9b6aab9 | 820 | * Send an AUN protocol response. |
1da177e4 LT |
821 | */ |
822 | ||
823 | static void aun_send_response(__u32 addr, unsigned long seq, int code, int cb) | |
824 | { | |
825 | struct sockaddr_in sin = { | |
826 | .sin_family = AF_INET, | |
827 | .sin_port = htons(AUN_PORT), | |
828 | .sin_addr = {.s_addr = addr} | |
829 | }; | |
830 | struct aunhdr ah = {.code = code, .cb = cb, .handle = seq}; | |
831 | struct kvec iov = {.iov_base = (void *)&ah, .iov_len = sizeof(ah)}; | |
832 | struct msghdr udpmsg; | |
c9b6aab9 | 833 | |
1da177e4 LT |
834 | udpmsg.msg_name = (void *)&sin; |
835 | udpmsg.msg_namelen = sizeof(sin); | |
836 | udpmsg.msg_control = NULL; | |
837 | udpmsg.msg_controllen = 0; | |
ee9c88f2 | 838 | udpmsg.msg_flags = 0; |
1da177e4 LT |
839 | |
840 | kernel_sendmsg(udpsock, &udpmsg, &iov, 1, sizeof(ah)); | |
841 | } | |
842 | ||
843 | ||
844 | /* | |
845 | * Handle incoming AUN packets. Work out if anybody wants them, | |
846 | * and send positive or negative acknowledgements as appropriate. | |
847 | */ | |
848 | ||
849 | static void aun_incoming(struct sk_buff *skb, struct aunhdr *ah, size_t len) | |
850 | { | |
eddc9ec5 | 851 | struct iphdr *ip = ip_hdr(skb); |
1da177e4 | 852 | unsigned char stn = ntohl(ip->saddr) & 0xff; |
4e085e76 DM |
853 | struct dst_entry *dst = skb_dst(skb); |
854 | struct ec_device *edev = NULL; | |
0c78a92f | 855 | struct sock *sk = NULL; |
1da177e4 | 856 | struct sk_buff *newskb; |
4e085e76 DM |
857 | |
858 | if (dst) | |
859 | edev = dst->dev->ec_ptr; | |
1da177e4 | 860 | |
ee9c88f2 | 861 | if (!edev) |
1da177e4 LT |
862 | goto bad; |
863 | ||
ee9c88f2 JP |
864 | sk = ec_listening_socket(ah->port, stn, edev->net); |
865 | if (sk == NULL) | |
1da177e4 LT |
866 | goto bad; /* Nobody wants it */ |
867 | ||
c9b6aab9 | 868 | newskb = alloc_skb((len - sizeof(struct aunhdr) + 15) & ~15, |
1da177e4 | 869 | GFP_ATOMIC); |
ee9c88f2 JP |
870 | if (newskb == NULL) { |
871 | pr_debug("AUN: memory squeeze, dropping packet\n"); | |
1da177e4 LT |
872 | /* Send nack and hope sender tries again */ |
873 | goto bad; | |
874 | } | |
875 | ||
ee9c88f2 | 876 | memcpy(skb_put(newskb, len - sizeof(struct aunhdr)), (void *)(ah + 1), |
1da177e4 LT |
877 | len - sizeof(struct aunhdr)); |
878 | ||
ee9c88f2 | 879 | if (ec_queue_packet(sk, newskb, stn, edev->net, ah->cb, ah->port)) { |
1da177e4 LT |
880 | /* Socket is bankrupt. */ |
881 | kfree_skb(newskb); | |
882 | goto bad; | |
883 | } | |
884 | ||
885 | aun_send_response(ip->saddr, ah->handle, 3, 0); | |
0c78a92f | 886 | sock_put(sk); |
1da177e4 LT |
887 | return; |
888 | ||
889 | bad: | |
890 | aun_send_response(ip->saddr, ah->handle, 4, 0); | |
0c78a92f ED |
891 | if (sk) |
892 | sock_put(sk); | |
1da177e4 LT |
893 | } |
894 | ||
895 | /* | |
896 | * Handle incoming AUN transmit acknowledgements. If the sequence | |
897 | * number matches something in our backlog then kill it and tell | |
898 | * the user. If the remote took too long to reply then we may have | |
899 | * dropped the packet already. | |
900 | */ | |
901 | ||
902 | static void aun_tx_ack(unsigned long seq, int result) | |
903 | { | |
904 | struct sk_buff *skb; | |
905 | unsigned long flags; | |
906 | struct ec_cb *eb; | |
907 | ||
908 | spin_lock_irqsave(&aun_queue_lock, flags); | |
de103342 | 909 | skb_queue_walk(&aun_queue, skb) { |
1da177e4 LT |
910 | eb = (struct ec_cb *)&skb->cb; |
911 | if (eb->seq == seq) | |
912 | goto foundit; | |
1da177e4 LT |
913 | } |
914 | spin_unlock_irqrestore(&aun_queue_lock, flags); | |
ee9c88f2 | 915 | pr_debug("AUN: unknown sequence %ld\n", seq); |
1da177e4 LT |
916 | return; |
917 | ||
918 | foundit: | |
919 | tx_result(skb->sk, eb->cookie, result); | |
8728b834 | 920 | skb_unlink(skb, &aun_queue); |
1da177e4 LT |
921 | spin_unlock_irqrestore(&aun_queue_lock, flags); |
922 | kfree_skb(skb); | |
923 | } | |
924 | ||
925 | /* | |
926 | * Deal with received AUN frames - sort out what type of thing it is | |
927 | * and hand it to the right function. | |
928 | */ | |
929 | ||
930 | static void aun_data_available(struct sock *sk, int slen) | |
931 | { | |
932 | int err; | |
933 | struct sk_buff *skb; | |
934 | unsigned char *data; | |
935 | struct aunhdr *ah; | |
1da177e4 LT |
936 | size_t len; |
937 | ||
938 | while ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) { | |
939 | if (err == -EAGAIN) { | |
ee9c88f2 | 940 | pr_err("AUN: no data available?!\n"); |
1da177e4 LT |
941 | return; |
942 | } | |
ee9c88f2 | 943 | pr_debug("AUN: recvfrom() error %d\n", -err); |
1da177e4 LT |
944 | } |
945 | ||
9c70220b | 946 | data = skb_transport_header(skb) + sizeof(struct udphdr); |
1da177e4 LT |
947 | ah = (struct aunhdr *)data; |
948 | len = skb->len - sizeof(struct udphdr); | |
1da177e4 | 949 | |
ee9c88f2 | 950 | switch (ah->code) { |
1da177e4 LT |
951 | case 2: |
952 | aun_incoming(skb, ah, len); | |
953 | break; | |
954 | case 3: | |
955 | aun_tx_ack(ah->handle, ECTYPE_TRANSMIT_OK); | |
956 | break; | |
957 | case 4: | |
958 | aun_tx_ack(ah->handle, ECTYPE_TRANSMIT_NOT_LISTENING); | |
959 | break; | |
1da177e4 | 960 | default: |
ee9c88f2 | 961 | pr_debug("AUN: unknown packet type: %d\n", data[0]); |
1da177e4 LT |
962 | } |
963 | ||
964 | skb_free_datagram(sk, skb); | |
965 | } | |
966 | ||
967 | /* | |
968 | * Called by the timer to manage the AUN transmit queue. If a packet | |
969 | * was sent to a dead or nonexistent host then we will never get an | |
970 | * acknowledgement back. After a few seconds we need to spot this and | |
971 | * drop the packet. | |
972 | */ | |
973 | ||
974 | static void ab_cleanup(unsigned long h) | |
975 | { | |
de103342 | 976 | struct sk_buff *skb, *n; |
1da177e4 LT |
977 | unsigned long flags; |
978 | ||
979 | spin_lock_irqsave(&aun_queue_lock, flags); | |
de103342 | 980 | skb_queue_walk_safe(&aun_queue, skb, n) { |
1da177e4 | 981 | struct ec_cb *eb = (struct ec_cb *)&skb->cb; |
de103342 | 982 | if ((jiffies - eb->start) > eb->timeout) { |
c9b6aab9 | 983 | tx_result(skb->sk, eb->cookie, |
1da177e4 | 984 | ECTYPE_TRANSMIT_NOT_PRESENT); |
8728b834 | 985 | skb_unlink(skb, &aun_queue); |
1da177e4 LT |
986 | kfree_skb(skb); |
987 | } | |
1da177e4 LT |
988 | } |
989 | spin_unlock_irqrestore(&aun_queue_lock, flags); | |
990 | ||
ee9c88f2 | 991 | mod_timer(&ab_cleanup_timer, jiffies + (HZ * 2)); |
1da177e4 LT |
992 | } |
993 | ||
994 | static int __init aun_udp_initialise(void) | |
995 | { | |
996 | int error; | |
997 | struct sockaddr_in sin; | |
998 | ||
999 | skb_queue_head_init(&aun_queue); | |
b24b8a24 | 1000 | setup_timer(&ab_cleanup_timer, ab_cleanup, 0); |
ee9c88f2 | 1001 | ab_cleanup_timer.expires = jiffies + (HZ * 2); |
1da177e4 LT |
1002 | add_timer(&ab_cleanup_timer); |
1003 | ||
1004 | memset(&sin, 0, sizeof(sin)); | |
1005 | sin.sin_port = htons(AUN_PORT); | |
1006 | ||
1007 | /* We can count ourselves lucky Acorn machines are too dim to | |
1008 | speak IPv6. :-) */ | |
ee9c88f2 JP |
1009 | error = sock_create_kern(PF_INET, SOCK_DGRAM, 0, &udpsock); |
1010 | if (error < 0) { | |
1011 | pr_err("AUN: socket error %d\n", -error); | |
1da177e4 LT |
1012 | return error; |
1013 | } | |
c9b6aab9 | 1014 | |
4a17fd52 | 1015 | udpsock->sk->sk_reuse = SK_CAN_REUSE; |
1da177e4 LT |
1016 | udpsock->sk->sk_allocation = GFP_ATOMIC; /* we're going to call it |
1017 | from interrupts */ | |
c9b6aab9 | 1018 | |
1da177e4 | 1019 | error = udpsock->ops->bind(udpsock, (struct sockaddr *)&sin, |
ee9c88f2 JP |
1020 | sizeof(sin)); |
1021 | if (error < 0) { | |
1022 | pr_err("AUN: bind error %d\n", -error); | |
1da177e4 LT |
1023 | goto release; |
1024 | } | |
1025 | ||
1026 | udpsock->sk->sk_data_ready = aun_data_available; | |
1027 | ||
1028 | return 0; | |
1029 | ||
1030 | release: | |
1031 | sock_release(udpsock); | |
1032 | udpsock = NULL; | |
1033 | return error; | |
1034 | } | |
1035 | #endif | |
1036 | ||
1037 | #ifdef CONFIG_ECONET_NATIVE | |
1038 | ||
1039 | /* | |
1040 | * Receive an Econet frame from a device. | |
1041 | */ | |
1042 | ||
ee9c88f2 JP |
1043 | static int econet_rcv(struct sk_buff *skb, struct net_device *dev, |
1044 | struct packet_type *pt, struct net_device *orig_dev) | |
1da177e4 LT |
1045 | { |
1046 | struct ec_framehdr *hdr; | |
0c78a92f | 1047 | struct sock *sk = NULL; |
1da177e4 LT |
1048 | struct ec_device *edev = dev->ec_ptr; |
1049 | ||
721499e8 | 1050 | if (!net_eq(dev_net(dev), &init_net)) |
e730c155 EB |
1051 | goto drop; |
1052 | ||
1da177e4 LT |
1053 | if (skb->pkt_type == PACKET_OTHERHOST) |
1054 | goto drop; | |
1055 | ||
1056 | if (!edev) | |
1057 | goto drop; | |
1058 | ||
ee9c88f2 JP |
1059 | skb = skb_share_check(skb, GFP_ATOMIC); |
1060 | if (skb == NULL) | |
1da177e4 LT |
1061 | return NET_RX_DROP; |
1062 | ||
1063 | if (!pskb_may_pull(skb, sizeof(struct ec_framehdr))) | |
1064 | goto drop; | |
1065 | ||
ee9c88f2 | 1066 | hdr = (struct ec_framehdr *)skb->data; |
1da177e4 LT |
1067 | |
1068 | /* First check for encapsulated IP */ | |
1069 | if (hdr->port == EC_PORT_IP) { | |
1070 | skb->protocol = htons(ETH_P_IP); | |
1071 | skb_pull(skb, sizeof(struct ec_framehdr)); | |
1072 | netif_rx(skb); | |
482d804c | 1073 | return NET_RX_SUCCESS; |
1da177e4 LT |
1074 | } |
1075 | ||
1076 | sk = ec_listening_socket(hdr->port, hdr->src_stn, hdr->src_net); | |
1077 | if (!sk) | |
1078 | goto drop; | |
1079 | ||
1080 | if (ec_queue_packet(sk, skb, edev->net, hdr->src_stn, hdr->cb, | |
1081 | hdr->port)) | |
1082 | goto drop; | |
0c78a92f | 1083 | sock_put(sk); |
482d804c | 1084 | return NET_RX_SUCCESS; |
1da177e4 LT |
1085 | |
1086 | drop: | |
0c78a92f ED |
1087 | if (sk) |
1088 | sock_put(sk); | |
1da177e4 LT |
1089 | kfree_skb(skb); |
1090 | return NET_RX_DROP; | |
1091 | } | |
1092 | ||
7546dd97 | 1093 | static struct packet_type econet_packet_type __read_mostly = { |
ee9c88f2 JP |
1094 | .type = cpu_to_be16(ETH_P_ECONET), |
1095 | .func = econet_rcv, | |
1da177e4 LT |
1096 | }; |
1097 | ||
1098 | static void econet_hw_initialise(void) | |
1099 | { | |
1100 | dev_add_pack(&econet_packet_type); | |
1101 | } | |
1102 | ||
1103 | #endif | |
1104 | ||
ee9c88f2 JP |
1105 | static int econet_notifier(struct notifier_block *this, unsigned long msg, |
1106 | void *data) | |
1da177e4 | 1107 | { |
ee9c88f2 | 1108 | struct net_device *dev = data; |
1da177e4 LT |
1109 | struct ec_device *edev; |
1110 | ||
721499e8 | 1111 | if (!net_eq(dev_net(dev), &init_net)) |
e9dc8653 EB |
1112 | return NOTIFY_DONE; |
1113 | ||
1da177e4 LT |
1114 | switch (msg) { |
1115 | case NETDEV_UNREGISTER: | |
1116 | /* A device has gone down - kill any data we hold for it. */ | |
1117 | edev = dev->ec_ptr; | |
ee9c88f2 | 1118 | if (edev) { |
1da177e4 LT |
1119 | if (net2dev_map[0] == dev) |
1120 | net2dev_map[0] = NULL; | |
1121 | net2dev_map[edev->net] = NULL; | |
1122 | kfree(edev); | |
1123 | dev->ec_ptr = NULL; | |
1124 | } | |
1125 | break; | |
1126 | } | |
1127 | ||
1128 | return NOTIFY_DONE; | |
1129 | } | |
1130 | ||
1131 | static struct notifier_block econet_netdev_notifier = { | |
ee9c88f2 | 1132 | .notifier_call = econet_notifier, |
1da177e4 LT |
1133 | }; |
1134 | ||
1135 | static void __exit econet_proto_exit(void) | |
1136 | { | |
1137 | #ifdef CONFIG_ECONET_AUNUDP | |
1138 | del_timer(&ab_cleanup_timer); | |
1139 | if (udpsock) | |
1140 | sock_release(udpsock); | |
1141 | #endif | |
1142 | unregister_netdevice_notifier(&econet_netdev_notifier); | |
9c29a377 AD |
1143 | #ifdef CONFIG_ECONET_NATIVE |
1144 | dev_remove_pack(&econet_packet_type); | |
1145 | #endif | |
1da177e4 LT |
1146 | sock_unregister(econet_family_ops.family); |
1147 | proto_unregister(&econet_proto); | |
1148 | } | |
1149 | ||
1150 | static int __init econet_proto_init(void) | |
1151 | { | |
1152 | int err = proto_register(&econet_proto, 0); | |
1153 | ||
1154 | if (err != 0) | |
1155 | goto out; | |
1156 | sock_register(&econet_family_ops); | |
1157 | #ifdef CONFIG_ECONET_AUNUDP | |
1da177e4 LT |
1158 | aun_udp_initialise(); |
1159 | #endif | |
1160 | #ifdef CONFIG_ECONET_NATIVE | |
1161 | econet_hw_initialise(); | |
1162 | #endif | |
1163 | register_netdevice_notifier(&econet_netdev_notifier); | |
1164 | out: | |
1165 | return err; | |
1166 | } | |
1167 | ||
1168 | module_init(econet_proto_init); | |
1169 | module_exit(econet_proto_exit); | |
1170 | ||
1171 | MODULE_LICENSE("GPL"); | |
1172 | MODULE_ALIAS_NETPROTO(PF_ECONET); |