Root/drivers/atm/atmtcp.c

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 <linux/slab.h>
13#include <asm/uaccess.h>
14#include <linux/atomic.h>
15
16
17extern int atm_init_aal5(struct atm_vcc *vcc); /* "raw" AAL5 transport */
18
19
20#define PRIV(dev) ((struct atmtcp_dev_data *) ((dev)->dev_data))
21
22
23struct atmtcp_dev_data {
24    struct atm_vcc *vcc; /* control VCC; NULL if detached */
25    int persist; /* non-zero if persistent */
26};
27
28
29#define DEV_LABEL "atmtcp"
30
31#define MAX_VPI_BITS 8 /* simplifies life */
32#define MAX_VCI_BITS 16
33
34
35/*
36 * Hairy code ahead: the control VCC may be closed while we're still
37 * waiting for an answer, so we need to re-validate out_vcc every once
38 * in a while.
39 */
40
41
42static int atmtcp_send_control(struct atm_vcc *vcc,int type,
43    const struct atmtcp_control *msg,int flag)
44{
45    DECLARE_WAITQUEUE(wait,current);
46    struct atm_vcc *out_vcc;
47    struct sk_buff *skb;
48    struct atmtcp_control *new_msg;
49    int old_test;
50    int error = 0;
51
52    out_vcc = PRIV(vcc->dev) ? PRIV(vcc->dev)->vcc : NULL;
53    if (!out_vcc) return -EUNATCH;
54    skb = alloc_skb(sizeof(*msg),GFP_KERNEL);
55    if (!skb) return -ENOMEM;
56    mb();
57    out_vcc = PRIV(vcc->dev) ? PRIV(vcc->dev)->vcc : NULL;
58    if (!out_vcc) {
59        dev_kfree_skb(skb);
60        return -EUNATCH;
61    }
62    atm_force_charge(out_vcc,skb->truesize);
63    new_msg = (struct atmtcp_control *) skb_put(skb,sizeof(*new_msg));
64    *new_msg = *msg;
65    new_msg->hdr.length = ATMTCP_HDR_MAGIC;
66    new_msg->type = type;
67    memset(&new_msg->vcc,0,sizeof(atm_kptr_t));
68    *(struct atm_vcc **) &new_msg->vcc = vcc;
69    old_test = test_bit(flag,&vcc->flags);
70    out_vcc->push(out_vcc,skb);
71    add_wait_queue(sk_sleep(sk_atm(vcc)), &wait);
72    while (test_bit(flag,&vcc->flags) == old_test) {
73        mb();
74        out_vcc = PRIV(vcc->dev) ? PRIV(vcc->dev)->vcc : NULL;
75        if (!out_vcc) {
76            error = -EUNATCH;
77            break;
78        }
79        set_current_state(TASK_UNINTERRUPTIBLE);
80        schedule();
81    }
82    set_current_state(TASK_RUNNING);
83    remove_wait_queue(sk_sleep(sk_atm(vcc)), &wait);
84    return error;
85}
86
87
88static int atmtcp_recv_control(const struct atmtcp_control *msg)
89{
90    struct atm_vcc *vcc = *(struct atm_vcc **) &msg->vcc;
91
92    vcc->vpi = msg->addr.sap_addr.vpi;
93    vcc->vci = msg->addr.sap_addr.vci;
94    vcc->qos = msg->qos;
95    sk_atm(vcc)->sk_err = -msg->result;
96    switch (msg->type) {
97        case ATMTCP_CTRL_OPEN:
98        change_bit(ATM_VF_READY,&vcc->flags);
99        break;
100        case ATMTCP_CTRL_CLOSE:
101        change_bit(ATM_VF_ADDR,&vcc->flags);
102        break;
103        default:
104        printk(KERN_ERR "atmtcp_recv_control: unknown type %d\n",
105            msg->type);
106        return -EINVAL;
107    }
108    wake_up(sk_sleep(sk_atm(vcc)));
109    return 0;
110}
111
112
113static void atmtcp_v_dev_close(struct atm_dev *dev)
114{
115    /* Nothing.... Isn't this simple :-) -- REW */
116}
117
118
119static int atmtcp_v_open(struct atm_vcc *vcc)
120{
121    struct atmtcp_control msg;
122    int error;
123    short vpi = vcc->vpi;
124    int vci = vcc->vci;
125
126    memset(&msg,0,sizeof(msg));
127    msg.addr.sap_family = AF_ATMPVC;
128    msg.hdr.vpi = htons(vpi);
129    msg.addr.sap_addr.vpi = vpi;
130    msg.hdr.vci = htons(vci);
131    msg.addr.sap_addr.vci = vci;
132    if (vpi == ATM_VPI_UNSPEC || vci == ATM_VCI_UNSPEC) return 0;
133    msg.type = ATMTCP_CTRL_OPEN;
134    msg.qos = vcc->qos;
135    set_bit(ATM_VF_ADDR,&vcc->flags);
136    clear_bit(ATM_VF_READY,&vcc->flags); /* just in case ... */
137    error = atmtcp_send_control(vcc,ATMTCP_CTRL_OPEN,&msg,ATM_VF_READY);
138    if (error) return error;
139    return -sk_atm(vcc)->sk_err;
140}
141
142
143static void atmtcp_v_close(struct atm_vcc *vcc)
144{
145    struct atmtcp_control msg;
146
147    memset(&msg,0,sizeof(msg));
148    msg.addr.sap_family = AF_ATMPVC;
149    msg.addr.sap_addr.vpi = vcc->vpi;
150    msg.addr.sap_addr.vci = vcc->vci;
151    clear_bit(ATM_VF_READY,&vcc->flags);
152    (void) atmtcp_send_control(vcc,ATMTCP_CTRL_CLOSE,&msg,ATM_VF_ADDR);
153}
154
155
156static int atmtcp_v_ioctl(struct atm_dev *dev,unsigned int cmd,void __user *arg)
157{
158    struct atm_cirange ci;
159    struct atm_vcc *vcc;
160    struct hlist_node *node;
161    struct sock *s;
162    int i;
163
164    if (cmd != ATM_SETCIRANGE) return -ENOIOCTLCMD;
165    if (copy_from_user(&ci, arg,sizeof(ci))) return -EFAULT;
166    if (ci.vpi_bits == ATM_CI_MAX) ci.vpi_bits = MAX_VPI_BITS;
167    if (ci.vci_bits == ATM_CI_MAX) ci.vci_bits = MAX_VCI_BITS;
168    if (ci.vpi_bits > MAX_VPI_BITS || ci.vpi_bits < 0 ||
169        ci.vci_bits > MAX_VCI_BITS || ci.vci_bits < 0) return -EINVAL;
170    read_lock(&vcc_sklist_lock);
171    for(i = 0; i < VCC_HTABLE_SIZE; ++i) {
172        struct hlist_head *head = &vcc_hash[i];
173
174        sk_for_each(s, node, head) {
175            vcc = atm_sk(s);
176            if (vcc->dev != dev)
177                continue;
178            if ((vcc->vpi >> ci.vpi_bits) ||
179                (vcc->vci >> ci.vci_bits)) {
180                read_unlock(&vcc_sklist_lock);
181                return -EBUSY;
182            }
183        }
184    }
185    read_unlock(&vcc_sklist_lock);
186    dev->ci_range = ci;
187    return 0;
188}
189
190
191static int atmtcp_v_send(struct atm_vcc *vcc,struct sk_buff *skb)
192{
193    struct atmtcp_dev_data *dev_data;
194    struct atm_vcc *out_vcc=NULL; /* Initializer quietens GCC warning */
195    struct sk_buff *new_skb;
196    struct atmtcp_hdr *hdr;
197    int size;
198
199    if (vcc->qos.txtp.traffic_class == ATM_NONE) {
200        if (vcc->pop) vcc->pop(vcc,skb);
201        else dev_kfree_skb(skb);
202        return -EINVAL;
203    }
204    dev_data = PRIV(vcc->dev);
205    if (dev_data) out_vcc = dev_data->vcc;
206    if (!dev_data || !out_vcc) {
207        if (vcc->pop) vcc->pop(vcc,skb);
208        else dev_kfree_skb(skb);
209        if (dev_data) return 0;
210        atomic_inc(&vcc->stats->tx_err);
211        return -ENOLINK;
212    }
213    size = skb->len+sizeof(struct atmtcp_hdr);
214    new_skb = atm_alloc_charge(out_vcc,size,GFP_ATOMIC);
215    if (!new_skb) {
216        if (vcc->pop) vcc->pop(vcc,skb);
217        else dev_kfree_skb(skb);
218        atomic_inc(&vcc->stats->tx_err);
219        return -ENOBUFS;
220    }
221    hdr = (void *) skb_put(new_skb,sizeof(struct atmtcp_hdr));
222    hdr->vpi = htons(vcc->vpi);
223    hdr->vci = htons(vcc->vci);
224    hdr->length = htonl(skb->len);
225    skb_copy_from_linear_data(skb, skb_put(new_skb, skb->len), skb->len);
226    if (vcc->pop) vcc->pop(vcc,skb);
227    else dev_kfree_skb(skb);
228    out_vcc->push(out_vcc,new_skb);
229    atomic_inc(&vcc->stats->tx);
230    atomic_inc(&out_vcc->stats->rx);
231    return 0;
232}
233
234
235static int atmtcp_v_proc(struct atm_dev *dev,loff_t *pos,char *page)
236{
237    struct atmtcp_dev_data *dev_data = PRIV(dev);
238
239    if (*pos) return 0;
240    if (!dev_data->persist) return sprintf(page,"ephemeral\n");
241    return sprintf(page,"persistent, %sconnected\n",
242        dev_data->vcc ? "" : "dis");
243}
244
245
246static void atmtcp_c_close(struct atm_vcc *vcc)
247{
248    struct atm_dev *atmtcp_dev;
249    struct atmtcp_dev_data *dev_data;
250
251    atmtcp_dev = (struct atm_dev *) vcc->dev_data;
252    dev_data = PRIV(atmtcp_dev);
253    dev_data->vcc = NULL;
254    if (dev_data->persist) return;
255    atmtcp_dev->dev_data = NULL;
256    kfree(dev_data);
257    atm_dev_deregister(atmtcp_dev);
258    vcc->dev_data = NULL;
259    module_put(THIS_MODULE);
260}
261
262
263static struct atm_vcc *find_vcc(struct atm_dev *dev, short vpi, int vci)
264{
265        struct hlist_head *head;
266        struct atm_vcc *vcc;
267        struct hlist_node *node;
268        struct sock *s;
269
270        head = &vcc_hash[vci & (VCC_HTABLE_SIZE -1)];
271
272        sk_for_each(s, node, head) {
273                vcc = atm_sk(s);
274                if (vcc->dev == dev &&
275                    vcc->vci == vci && vcc->vpi == vpi &&
276                    vcc->qos.rxtp.traffic_class != ATM_NONE) {
277                                return vcc;
278                }
279        }
280        return NULL;
281}
282
283
284static int atmtcp_c_send(struct atm_vcc *vcc,struct sk_buff *skb)
285{
286    struct atm_dev *dev;
287    struct atmtcp_hdr *hdr;
288    struct atm_vcc *out_vcc;
289    struct sk_buff *new_skb;
290    int result = 0;
291
292    if (!skb->len) return 0;
293    dev = vcc->dev_data;
294    hdr = (struct atmtcp_hdr *) skb->data;
295    if (hdr->length == ATMTCP_HDR_MAGIC) {
296        result = atmtcp_recv_control(
297            (struct atmtcp_control *) skb->data);
298        goto done;
299    }
300    read_lock(&vcc_sklist_lock);
301    out_vcc = find_vcc(dev, ntohs(hdr->vpi), ntohs(hdr->vci));
302    read_unlock(&vcc_sklist_lock);
303    if (!out_vcc) {
304        atomic_inc(&vcc->stats->tx_err);
305        goto done;
306    }
307    skb_pull(skb,sizeof(struct atmtcp_hdr));
308    new_skb = atm_alloc_charge(out_vcc,skb->len,GFP_KERNEL);
309    if (!new_skb) {
310        result = -ENOBUFS;
311        goto done;
312    }
313    __net_timestamp(new_skb);
314    skb_copy_from_linear_data(skb, skb_put(new_skb, skb->len), skb->len);
315    out_vcc->push(out_vcc,new_skb);
316    atomic_inc(&vcc->stats->tx);
317    atomic_inc(&out_vcc->stats->rx);
318done:
319    if (vcc->pop) vcc->pop(vcc,skb);
320    else dev_kfree_skb(skb);
321    return result;
322}
323
324
325/*
326 * Device operations for the virtual ATM devices created by ATMTCP.
327 */
328
329
330static struct atmdev_ops atmtcp_v_dev_ops = {
331    .dev_close = atmtcp_v_dev_close,
332    .open = atmtcp_v_open,
333    .close = atmtcp_v_close,
334    .ioctl = atmtcp_v_ioctl,
335    .send = atmtcp_v_send,
336    .proc_read = atmtcp_v_proc,
337    .owner = THIS_MODULE
338};
339
340
341/*
342 * Device operations for the ATMTCP control device.
343 */
344
345
346static struct atmdev_ops atmtcp_c_dev_ops = {
347    .close = atmtcp_c_close,
348    .send = atmtcp_c_send
349};
350
351
352static struct atm_dev atmtcp_control_dev = {
353    .ops = &atmtcp_c_dev_ops,
354    .type = "atmtcp",
355    .number = 999,
356    .lock = __SPIN_LOCK_UNLOCKED(atmtcp_control_dev.lock)
357};
358
359
360static int atmtcp_create(int itf,int persist,struct atm_dev **result)
361{
362    struct atmtcp_dev_data *dev_data;
363    struct atm_dev *dev;
364
365    dev_data = kmalloc(sizeof(*dev_data),GFP_KERNEL);
366    if (!dev_data)
367        return -ENOMEM;
368
369    dev = atm_dev_register(DEV_LABEL,NULL,&atmtcp_v_dev_ops,itf,NULL);
370    if (!dev) {
371        kfree(dev_data);
372        return itf == -1 ? -ENOMEM : -EBUSY;
373    }
374    dev->ci_range.vpi_bits = MAX_VPI_BITS;
375    dev->ci_range.vci_bits = MAX_VCI_BITS;
376    dev->dev_data = dev_data;
377    PRIV(dev)->vcc = NULL;
378    PRIV(dev)->persist = persist;
379    if (result) *result = dev;
380    return 0;
381}
382
383
384static int atmtcp_attach(struct atm_vcc *vcc,int itf)
385{
386    struct atm_dev *dev;
387
388    dev = NULL;
389    if (itf != -1) dev = atm_dev_lookup(itf);
390    if (dev) {
391        if (dev->ops != &atmtcp_v_dev_ops) {
392            atm_dev_put(dev);
393            return -EMEDIUMTYPE;
394        }
395        if (PRIV(dev)->vcc) {
396            atm_dev_put(dev);
397            return -EBUSY;
398        }
399    }
400    else {
401        int error;
402
403        error = atmtcp_create(itf,0,&dev);
404        if (error) return error;
405    }
406    PRIV(dev)->vcc = vcc;
407    vcc->dev = &atmtcp_control_dev;
408    vcc_insert_socket(sk_atm(vcc));
409    set_bit(ATM_VF_META,&vcc->flags);
410    set_bit(ATM_VF_READY,&vcc->flags);
411    vcc->dev_data = dev;
412    (void) atm_init_aal5(vcc); /* @@@ losing AAL in transit ... */
413    vcc->stats = &atmtcp_control_dev.stats.aal5;
414    return dev->number;
415}
416
417
418static int atmtcp_create_persistent(int itf)
419{
420    return atmtcp_create(itf,1,NULL);
421}
422
423
424static int atmtcp_remove_persistent(int itf)
425{
426    struct atm_dev *dev;
427    struct atmtcp_dev_data *dev_data;
428
429    dev = atm_dev_lookup(itf);
430    if (!dev) return -ENODEV;
431    if (dev->ops != &atmtcp_v_dev_ops) {
432        atm_dev_put(dev);
433        return -EMEDIUMTYPE;
434    }
435    dev_data = PRIV(dev);
436    if (!dev_data->persist) return 0;
437    dev_data->persist = 0;
438    if (PRIV(dev)->vcc) return 0;
439    kfree(dev_data);
440    atm_dev_put(dev);
441    atm_dev_deregister(dev);
442    return 0;
443}
444
445static int atmtcp_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
446{
447    int err = 0;
448    struct atm_vcc *vcc = ATM_SD(sock);
449
450    if (cmd != SIOCSIFATMTCP && cmd != ATMTCP_CREATE && cmd != ATMTCP_REMOVE)
451        return -ENOIOCTLCMD;
452
453    if (!capable(CAP_NET_ADMIN))
454        return -EPERM;
455
456    switch (cmd) {
457        case SIOCSIFATMTCP:
458            err = atmtcp_attach(vcc, (int) arg);
459            if (err >= 0) {
460                sock->state = SS_CONNECTED;
461                __module_get(THIS_MODULE);
462            }
463            break;
464        case ATMTCP_CREATE:
465            err = atmtcp_create_persistent((int) arg);
466            break;
467        case ATMTCP_REMOVE:
468            err = atmtcp_remove_persistent((int) arg);
469            break;
470    }
471    return err;
472}
473
474static struct atm_ioctl atmtcp_ioctl_ops = {
475    .owner = THIS_MODULE,
476    .ioctl = atmtcp_ioctl,
477};
478
479static __init int atmtcp_init(void)
480{
481    register_atm_ioctl(&atmtcp_ioctl_ops);
482    return 0;
483}
484
485
486static void __exit atmtcp_exit(void)
487{
488    deregister_atm_ioctl(&atmtcp_ioctl_ops);
489}
490
491MODULE_LICENSE("GPL");
492module_init(atmtcp_init);
493module_exit(atmtcp_exit);
494

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