1 /* drivers/atm/atmtcp.c - ATM over TCP "device" driver */
2
3 /* Written 1997-2000 by Werner Almesberger, EPFL LRC/ICA */
4
5
6 #include <linux/module.h>
7 #include <linux/wait.h>
8 #include <linux/atmdev.h>
9 #include <linux/atm_tcp.h>
10 #include <linux/bitops.h>
11 #include <linux/init.h>
12 #include <asm/uaccess.h>
13 #include <asm/atomic.h>
14
15
16 extern int atm_init_aal5(struct atm_vcc *vcc); /* "raw" AAL5 transport */
17
18
19 #define PRIV(dev) ((struct atmtcp_dev_data *) ((dev)->dev_data))
20
21
22 struct atmtcp_dev_data {
23 struct atm_vcc *vcc; /* control VCC; NULL if detached */
24 int persist; /* non-zero if persistent */
25 };
26
27
28 #define DEV_LABEL "atmtcp"
29
30 #define MAX_VPI_BITS 8 /* simplifies life */
31 #define MAX_VCI_BITS 16
32
33
34 /*
35 * Hairy code ahead: the control VCC may be closed while we're still
36 * waiting for an answer, so we need to re-validate out_vcc every once
37 * in a while.
38 */
39
40
41 static int atmtcp_send_control(struct atm_vcc *vcc,int type,
42 const struct atmtcp_control *msg,int flag)
43 {
44 DECLARE_WAITQUEUE(wait,current);
45 struct atm_vcc *out_vcc;
46 struct sk_buff *skb;
47 struct atmtcp_control *new_msg;
48 int old_test;
49 int error = 0;
50
51 out_vcc = PRIV(vcc->dev) ? PRIV(vcc->dev)->vcc : NULL;
52 if (!out_vcc) return -EUNATCH;
53 skb = alloc_skb(sizeof(*msg),GFP_KERNEL);
54 if (!skb) return -ENOMEM;
55 mb();
56 out_vcc = PRIV(vcc->dev) ? PRIV(vcc->dev)->vcc : NULL;
57 if (!out_vcc) {
58 dev_kfree_skb(skb);
59 return -EUNATCH;
60 }
61 atm_force_charge(out_vcc,skb->truesize);
62 new_msg = (struct atmtcp_control *) skb_put(skb,sizeof(*new_msg));
63 *new_msg = *msg;
64 new_msg->hdr.length = ATMTCP_HDR_MAGIC;
65 new_msg->type = type;
66 memset(&new_msg->vcc,0,sizeof(atm_kptr_t));
67 *(struct atm_vcc **) &new_msg->vcc = vcc;
68 old_test = test_bit(flag,&vcc->flags);
69 out_vcc->push(out_vcc,skb);
70 add_wait_queue(sk_atm(vcc)->sk_sleep, &wait);
71 while (test_bit(flag,&vcc->flags) == old_test) {
72 mb();
73 out_vcc = PRIV(vcc->dev) ? PRIV(vcc->dev)->vcc : NULL;
74 if (!out_vcc) {
75 error = -EUNATCH;
76 break;
77 }
78 set_current_state(TASK_UNINTERRUPTIBLE);
79 schedule();
80 }
81 set_current_state(TASK_RUNNING);
82 remove_wait_queue(sk_atm(vcc)->sk_sleep, &wait);
83 return error;
84 }
85
86
87 static int atmtcp_recv_control(const struct atmtcp_control *msg)
88 {
89 struct atm_vcc *vcc = *(struct atm_vcc **) &msg->vcc;
90
91 vcc->vpi = msg->addr.sap_addr.vpi;
92 vcc->vci = msg->addr.sap_addr.vci;
93 vcc->qos = msg->qos;
94 sk_atm(vcc)->sk_err = -msg->result;
95 switch (msg->type) {
96 case ATMTCP_CTRL_OPEN:
97 change_bit(ATM_VF_READY,&vcc->flags);
98 break;
99 case ATMTCP_CTRL_CLOSE:
100 change_bit(ATM_VF_ADDR,&vcc->flags);
101 break;
102 default:
103 printk(KERN_ERR "atmtcp_recv_control: unknown type %d\n",
104 msg->type);
105 return -EINVAL;
106 }
107 wake_up(sk_atm(vcc)->sk_sleep);
108 return 0;
109 }
110
111
112 static void atmtcp_v_dev_close(struct atm_dev *dev)
113 {
114 /* Nothing.... Isn't this simple :-) -- REW */
115 }
116
117
118 static int atmtcp_v_open(struct atm_vcc *vcc)
119 {
120 struct atmtcp_control msg;
121 int error;
122 short vpi = vcc->vpi;
123 int vci = vcc->vci;
124
125 memset(&msg,0,sizeof(msg));
126 msg.addr.sap_family = AF_ATMPVC;
127 msg.hdr.vpi = htons(vpi);
128 msg.addr.sap_addr.vpi = vpi;
129 msg.hdr.vci = htons(vci);
130 msg.addr.sap_addr.vci = vci;
131 if (vpi == ATM_VPI_UNSPEC || vci == ATM_VCI_UNSPEC) return 0;
132 msg.type = ATMTCP_CTRL_OPEN;
133 msg.qos = vcc->qos;
134 set_bit(ATM_VF_ADDR,&vcc->flags);
135 clear_bit(ATM_VF_READY,&vcc->flags); /* just in case ... */
136 error = atmtcp_send_control(vcc,ATMTCP_CTRL_OPEN,&msg,ATM_VF_READY);
137 if (error) return error;
138 return -sk_atm(vcc)->sk_err;
139 }
140
141
142 static void atmtcp_v_close(struct atm_vcc *vcc)
143 {
144 struct atmtcp_control msg;
145
146 memset(&msg,0,sizeof(msg));
147 msg.addr.sap_family = AF_ATMPVC;
148 msg.addr.sap_addr.vpi = vcc->vpi;
149 msg.addr.sap_addr.vci = vcc->vci;
150 clear_bit(ATM_VF_READY,&vcc->flags);
151 (void) atmtcp_send_control(vcc,ATMTCP_CTRL_CLOSE,&msg,ATM_VF_ADDR);
152 }
153
154
155 static int atmtcp_v_ioctl(struct atm_dev *dev,unsigned int cmd,void __user *arg)
156 {
157 struct atm_cirange ci;
158 struct atm_vcc *vcc;
159 struct hlist_node *node;
160 struct sock *s;
161 int i;
162
163 if (cmd != ATM_SETCIRANGE) return -ENOIOCTLCMD;
164 if (copy_from_user(&ci, arg,sizeof(ci))) return -EFAULT;
165 if (ci.vpi_bits == ATM_CI_MAX) ci.vpi_bits = MAX_VPI_BITS;
166 if (ci.vci_bits == ATM_CI_MAX) ci.vci_bits = MAX_VCI_BITS;
167 if (ci.vpi_bits > MAX_VPI_BITS || ci.vpi_bits < 0 ||
168 ci.vci_bits > MAX_VCI_BITS || ci.vci_bits < 0) return -EINVAL;
169 read_lock(&vcc_sklist_lock);
170 for(i = 0; i < VCC_HTABLE_SIZE; ++i) {
171 struct hlist_head *head = &vcc_hash[i];
172
173 sk_for_each(s, node, head) {
174 vcc = atm_sk(s);
175 if (vcc->dev != dev)
176 continue;
177 if ((vcc->vpi >> ci.vpi_bits) ||
178 (vcc->vci >> ci.vci_bits)) {
179 read_unlock(&vcc_sklist_lock);
180 return -EBUSY;
181 }
182 }
183 }
184 read_unlock(&vcc_sklist_lock);
185 dev->ci_range = ci;
186 return 0;
187 }
188
189
190 static int atmtcp_v_send(struct atm_vcc *vcc,struct sk_buff *skb)
191 {
192 struct atmtcp_dev_data *dev_data;
193 struct atm_vcc *out_vcc=NULL; /* Initializer quietens GCC warning */
194 struct sk_buff *new_skb;
195 struct atmtcp_hdr *hdr;
196 int size;
197
198 if (vcc->qos.txtp.traffic_class == ATM_NONE) {
199 if (vcc->pop) vcc->pop(vcc,skb);
200 else dev_kfree_skb(skb);
201 return -EINVAL;
202 }
203 dev_data = PRIV(vcc->dev);
204 if (dev_data) out_vcc = dev_data->vcc;
205 if (!dev_data || !out_vcc) {
206 if (vcc->pop) vcc->pop(vcc,skb);
207 else dev_kfree_skb(skb);
208 if (dev_data) return 0;
209 atomic_inc(&vcc->stats->tx_err);
210 return -ENOLINK;
211 }
212 size = skb->len+sizeof(struct atmtcp_hdr);
213 new_skb = atm_alloc_charge(out_vcc,size,GFP_ATOMIC);
214 if (!new_skb) {
215 if (vcc->pop) vcc->pop(vcc,skb);
216 else dev_kfree_skb(skb);
217 atomic_inc(&vcc->stats->tx_err);
218 return -ENOBUFS;
219 }
220 hdr = (void *) skb_put(new_skb,sizeof(struct atmtcp_hdr));
221 hdr->vpi = htons(vcc->vpi);
222 hdr->vci = htons(vcc->vci);
223 hdr->length = htonl(skb->len);
224 skb_copy_from_linear_data(skb, skb_put(new_skb, skb->len), skb->len);
225 if (vcc->pop) vcc->pop(vcc,skb);
226 else dev_kfree_skb(skb);
227 out_vcc->push(out_vcc,new_skb);
228 atomic_inc(&vcc->stats->tx);
229 atomic_inc(&out_vcc->stats->rx);
230 return 0;
231 }
232
233
234 static int atmtcp_v_proc(struct atm_dev *dev,loff_t *pos,char *page)
235 {
236 struct atmtcp_dev_data *dev_data = PRIV(dev);
237
238 if (*pos) return 0;
239 if (!dev_data->persist) return sprintf(page,"ephemeral\n");
240 return sprintf(page,"persistent, %sconnected\n",
241 dev_data->vcc ? "" : "dis");
242 }
243
244
245 static void atmtcp_c_close(struct atm_vcc *vcc)
246 {
247 struct atm_dev *atmtcp_dev;
248 struct atmtcp_dev_data *dev_data;
249
250 atmtcp_dev = (struct atm_dev *) vcc->dev_data;
251 dev_data = PRIV(atmtcp_dev);
252 dev_data->vcc = NULL;
253 if (dev_data->persist) return;
254 atmtcp_dev->dev_data = NULL;
255 kfree(dev_data);
256 atm_dev_deregister(atmtcp_dev);
257 vcc->dev_data = NULL;
258 module_put(THIS_MODULE);
259 }
260
261
262 static struct atm_vcc *find_vcc(struct atm_dev *dev, short vpi, int vci)
263 {
264 struct hlist_head *head;
265 struct atm_vcc *vcc;
266 struct hlist_node *node;
267 struct sock *s;
268
269 head = &vcc_hash[vci & (VCC_HTABLE_SIZE -1)];
270
271 sk_for_each(s, node, head) {
272 vcc = atm_sk(s);
273 if (vcc->dev == dev &&
274 vcc->vci == vci && vcc->vpi == vpi &&
275 vcc->qos.rxtp.traffic_class != ATM_NONE) {
276 return vcc;
277 }
278 }
279 return NULL;
280 }
281
282
283 static int atmtcp_c_send(struct atm_vcc *vcc,struct sk_buff *skb)
284 {
285 struct atm_dev *dev;
286 struct atmtcp_hdr *hdr;
287 struct atm_vcc *out_vcc;
288 struct sk_buff *new_skb;
289 int result = 0;
290
291 if (!skb->len) return 0;
292 dev = vcc->dev_data;
293 hdr = (struct atmtcp_hdr *) skb->data;
294 if (hdr->length == ATMTCP_HDR_MAGIC) {
295 result = atmtcp_recv_control(
296 (struct atmtcp_control *) skb->data);
297 goto done;
298 }
299 read_lock(&vcc_sklist_lock);
300 out_vcc = find_vcc(dev, ntohs(hdr->vpi), ntohs(hdr->vci));
301 read_unlock(&vcc_sklist_lock);
302 if (!out_vcc) {
303 atomic_inc(&vcc->stats->tx_err);
304 goto done;
305 }
306 skb_pull(skb,sizeof(struct atmtcp_hdr));
307 new_skb = atm_alloc_charge(out_vcc,skb->len,GFP_KERNEL);
308 if (!new_skb) {
309 result = -ENOBUFS;
310 goto done;
311 }
312 __net_timestamp(new_skb);
313 skb_copy_from_linear_data(skb, skb_put(new_skb, skb->len), skb->len);
314 out_vcc->push(out_vcc,new_skb);
315 atomic_inc(&vcc->stats->tx);
316 atomic_inc(&out_vcc->stats->rx);
317 done:
318 if (vcc->pop) vcc->pop(vcc,skb);
319 else dev_kfree_skb(skb);
320 return result;
321 }
322
323
324 /*
325 * Device operations for the virtual ATM devices created by ATMTCP.
326 */
327
328
329 static struct atmdev_ops atmtcp_v_dev_ops = {
330 .dev_close = atmtcp_v_dev_close,
331 .open = atmtcp_v_open,
332 .close = atmtcp_v_close,
333 .ioctl = atmtcp_v_ioctl,
334 .send = atmtcp_v_send,
335 .proc_read = atmtcp_v_proc,
336 .owner = THIS_MODULE
337 };
338
339
340 /*
341 * Device operations for the ATMTCP control device.
342 */
343
344
345 static struct atmdev_ops atmtcp_c_dev_ops = {
346 .close = atmtcp_c_close,
347 .send = atmtcp_c_send
348 };
349
350
351 static struct atm_dev atmtcp_control_dev = {
352 .ops = &atmtcp_c_dev_ops,
353 .type = "atmtcp",
354 .number = 999,
355 .lock = __SPIN_LOCK_UNLOCKED(atmtcp_control_dev.lock)
356 };
357
358
359 static int atmtcp_create(int itf,int persist,struct atm_dev **result)
360 {
361 struct atmtcp_dev_data *dev_data;
362 struct atm_dev *dev;
363
364 dev_data = kmalloc(sizeof(*dev_data),GFP_KERNEL);
365 if (!dev_data)
366 return -ENOMEM;
367
368 dev = atm_dev_register(DEV_LABEL,&atmtcp_v_dev_ops,itf,NULL);
369 if (!dev) {
370 kfree(dev_data);
371 return itf == -1 ? -ENOMEM : -EBUSY;
372 }
373 dev->ci_range.vpi_bits = MAX_VPI_BITS;
374 dev->ci_range.vci_bits = MAX_VCI_BITS;
375 dev->dev_data = dev_data;
376 PRIV(dev)->vcc = NULL;
377 PRIV(dev)->persist = persist;
378 if (result) *result = dev;
379 return 0;
380 }
381
382
383 static int atmtcp_attach(struct atm_vcc *vcc,int itf)
384 {
385 struct atm_dev *dev;
386
387 dev = NULL;
388 if (itf != -1) dev = atm_dev_lookup(itf);
389 if (dev) {
390 if (dev->ops != &atmtcp_v_dev_ops) {
391 atm_dev_put(dev);
392 return -EMEDIUMTYPE;
393 }
394 if (PRIV(dev)->vcc) return -EBUSY;
395 }
396 else {
397 int error;
398
399 error = atmtcp_create(itf,0,&dev);
400 if (error) return error;
401 }
402 PRIV(dev)->vcc = vcc;
403 vcc->dev = &atmtcp_control_dev;
404 vcc_insert_socket(sk_atm(vcc));
405 set_bit(ATM_VF_META,&vcc->flags);
406 set_bit(ATM_VF_READY,&vcc->flags);
407 vcc->dev_data = dev;
408 (void) atm_init_aal5(vcc); /* @@@ losing AAL in transit ... */
409 vcc->stats = &atmtcp_control_dev.stats.aal5;
410 return dev->number;
411 }
412
413
414 static int atmtcp_create_persistent(int itf)
415 {
416 return atmtcp_create(itf,1,NULL);
417 }
418
419
420 static int atmtcp_remove_persistent(int itf)
421 {
422 struct atm_dev *dev;
423 struct atmtcp_dev_data *dev_data;
424
425 dev = atm_dev_lookup(itf);
426 if (!dev) return -ENODEV;
427 if (dev->ops != &atmtcp_v_dev_ops) {
428 atm_dev_put(dev);
429 return -EMEDIUMTYPE;
430 }
431 dev_data = PRIV(dev);
432 if (!dev_data->persist) return 0;
433 dev_data->persist = 0;
434 if (PRIV(dev)->vcc) return 0;
435 kfree(dev_data);
436 atm_dev_put(dev);
437 atm_dev_deregister(dev);
438 return 0;
439 }
440
441 static int atmtcp_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
442 {
443 int err = 0;
444 struct atm_vcc *vcc = ATM_SD(sock);
445
446 if (cmd != SIOCSIFATMTCP && cmd != ATMTCP_CREATE && cmd != ATMTCP_REMOVE)
447 return -ENOIOCTLCMD;
448
449 if (!capable(CAP_NET_ADMIN))
450 return -EPERM;
451
452 switch (cmd) {
453 case SIOCSIFATMTCP:
454 err = atmtcp_attach(vcc, (int) arg);
455 if (err >= 0) {
456 sock->state = SS_CONNECTED;
457 __module_get(THIS_MODULE);
458 }
459 break;
460 case ATMTCP_CREATE:
461 err = atmtcp_create_persistent((int) arg);
462 break;
463 case ATMTCP_REMOVE:
464 err = atmtcp_remove_persistent((int) arg);
465 break;
466 }
467 return err;
468 }
469
470 static struct atm_ioctl atmtcp_ioctl_ops = {
471 .owner = THIS_MODULE,
472 .ioctl = atmtcp_ioctl,
473 };
474
475 static __init int atmtcp_init(void)
476 {
477 register_atm_ioctl(&atmtcp_ioctl_ops);
478 return 0;
479 }
480
481
482 static void __exit atmtcp_exit(void)
483 {
484 deregister_atm_ioctl(&atmtcp_ioctl_ops);
485 }
486
487 MODULE_LICENSE("GPL");
488 module_init(atmtcp_init);
489 module_exit(atmtcp_exit);
490
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