~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/net/atm/br2684.c

Version: ~ [ linux-5.11-rc3 ] ~ [ linux-5.10.7 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.89 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.167 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.215 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.251 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.251 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * Ethernet netdevice using ATM AAL5 as underlying carrier
  3  * (RFC1483 obsoleted by RFC2684) for Linux
  4  *
  5  * Authors: Marcell GAL, 2000, XDSL Ltd, Hungary
  6  *          Eric Kinzie, 2006-2007, US Naval Research Laboratory
  7  */
  8 
  9 #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
 10 
 11 #include <linux/module.h>
 12 #include <linux/init.h>
 13 #include <linux/kernel.h>
 14 #include <linux/list.h>
 15 #include <linux/netdevice.h>
 16 #include <linux/skbuff.h>
 17 #include <linux/etherdevice.h>
 18 #include <linux/rtnetlink.h>
 19 #include <linux/ip.h>
 20 #include <linux/uaccess.h>
 21 #include <linux/slab.h>
 22 #include <net/arp.h>
 23 #include <linux/atm.h>
 24 #include <linux/atmdev.h>
 25 #include <linux/capability.h>
 26 #include <linux/seq_file.h>
 27 
 28 #include <linux/atmbr2684.h>
 29 
 30 #include "common.h"
 31 
 32 static void skb_debug(const struct sk_buff *skb)
 33 {
 34 #ifdef SKB_DEBUG
 35 #define NUM2PRINT 50
 36         print_hex_dump(KERN_DEBUG, "br2684: skb: ", DUMP_OFFSET,
 37                        16, 1, skb->data, min(NUM2PRINT, skb->len), true);
 38 #endif
 39 }
 40 
 41 #define BR2684_ETHERTYPE_LEN    2
 42 #define BR2684_PAD_LEN          2
 43 
 44 #define LLC             0xaa, 0xaa, 0x03
 45 #define SNAP_BRIDGED    0x00, 0x80, 0xc2
 46 #define SNAP_ROUTED     0x00, 0x00, 0x00
 47 #define PID_ETHERNET    0x00, 0x07
 48 #define ETHERTYPE_IPV4  0x08, 0x00
 49 #define ETHERTYPE_IPV6  0x86, 0xdd
 50 #define PAD_BRIDGED     0x00, 0x00
 51 
 52 static const unsigned char ethertype_ipv4[] = { ETHERTYPE_IPV4 };
 53 static const unsigned char ethertype_ipv6[] = { ETHERTYPE_IPV6 };
 54 static const unsigned char llc_oui_pid_pad[] =
 55                         { LLC, SNAP_BRIDGED, PID_ETHERNET, PAD_BRIDGED };
 56 static const unsigned char pad[] = { PAD_BRIDGED };
 57 static const unsigned char llc_oui_ipv4[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV4 };
 58 static const unsigned char llc_oui_ipv6[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV6 };
 59 
 60 enum br2684_encaps {
 61         e_vc = BR2684_ENCAPS_VC,
 62         e_llc = BR2684_ENCAPS_LLC,
 63 };
 64 
 65 struct br2684_vcc {
 66         struct atm_vcc *atmvcc;
 67         struct net_device *device;
 68         /* keep old push, pop functions for chaining */
 69         void (*old_push)(struct atm_vcc *vcc, struct sk_buff *skb);
 70         void (*old_pop)(struct atm_vcc *vcc, struct sk_buff *skb);
 71         void (*old_release_cb)(struct atm_vcc *vcc);
 72         struct module *old_owner;
 73         enum br2684_encaps encaps;
 74         struct list_head brvccs;
 75 #ifdef CONFIG_ATM_BR2684_IPFILTER
 76         struct br2684_filter filter;
 77 #endif /* CONFIG_ATM_BR2684_IPFILTER */
 78         unsigned int copies_needed, copies_failed;
 79         atomic_t qspace;
 80 };
 81 
 82 struct br2684_dev {
 83         struct net_device *net_dev;
 84         struct list_head br2684_devs;
 85         int number;
 86         struct list_head brvccs;        /* one device <=> one vcc (before xmas) */
 87         int mac_was_set;
 88         enum br2684_payload payload;
 89 };
 90 
 91 /*
 92  * This lock should be held for writing any time the list of devices or
 93  * their attached vcc's could be altered.  It should be held for reading
 94  * any time these are being queried.  Note that we sometimes need to
 95  * do read-locking under interrupt context, so write locking must block
 96  * the current CPU's interrupts
 97  */
 98 static DEFINE_RWLOCK(devs_lock);
 99 
100 static LIST_HEAD(br2684_devs);
101 
102 static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev)
103 {
104         return netdev_priv(net_dev);
105 }
106 
107 static inline struct net_device *list_entry_brdev(const struct list_head *le)
108 {
109         return list_entry(le, struct br2684_dev, br2684_devs)->net_dev;
110 }
111 
112 static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc)
113 {
114         return (struct br2684_vcc *)(atmvcc->user_back);
115 }
116 
117 static inline struct br2684_vcc *list_entry_brvcc(const struct list_head *le)
118 {
119         return list_entry(le, struct br2684_vcc, brvccs);
120 }
121 
122 /* Caller should hold read_lock(&devs_lock) */
123 static struct net_device *br2684_find_dev(const struct br2684_if_spec *s)
124 {
125         struct list_head *lh;
126         struct net_device *net_dev;
127         switch (s->method) {
128         case BR2684_FIND_BYNUM:
129                 list_for_each(lh, &br2684_devs) {
130                         net_dev = list_entry_brdev(lh);
131                         if (BRPRIV(net_dev)->number == s->spec.devnum)
132                                 return net_dev;
133                 }
134                 break;
135         case BR2684_FIND_BYIFNAME:
136                 list_for_each(lh, &br2684_devs) {
137                         net_dev = list_entry_brdev(lh);
138                         if (!strncmp(net_dev->name, s->spec.ifname, IFNAMSIZ))
139                                 return net_dev;
140                 }
141                 break;
142         }
143         return NULL;
144 }
145 
146 static int atm_dev_event(struct notifier_block *this, unsigned long event,
147                  void *arg)
148 {
149         struct atm_dev *atm_dev = arg;
150         struct list_head *lh;
151         struct net_device *net_dev;
152         struct br2684_vcc *brvcc;
153         struct atm_vcc *atm_vcc;
154         unsigned long flags;
155 
156         pr_debug("event=%ld dev=%p\n", event, atm_dev);
157 
158         read_lock_irqsave(&devs_lock, flags);
159         list_for_each(lh, &br2684_devs) {
160                 net_dev = list_entry_brdev(lh);
161 
162                 list_for_each_entry(brvcc, &BRPRIV(net_dev)->brvccs, brvccs) {
163                         atm_vcc = brvcc->atmvcc;
164                         if (atm_vcc && brvcc->atmvcc->dev == atm_dev) {
165 
166                                 if (atm_vcc->dev->signal == ATM_PHY_SIG_LOST)
167                                         netif_carrier_off(net_dev);
168                                 else
169                                         netif_carrier_on(net_dev);
170 
171                         }
172                 }
173         }
174         read_unlock_irqrestore(&devs_lock, flags);
175 
176         return NOTIFY_DONE;
177 }
178 
179 static struct notifier_block atm_dev_notifier = {
180         .notifier_call = atm_dev_event,
181 };
182 
183 /* chained vcc->pop function.  Check if we should wake the netif_queue */
184 static void br2684_pop(struct atm_vcc *vcc, struct sk_buff *skb)
185 {
186         struct br2684_vcc *brvcc = BR2684_VCC(vcc);
187 
188         pr_debug("(vcc %p ; net_dev %p )\n", vcc, brvcc->device);
189         brvcc->old_pop(vcc, skb);
190 
191         /* If the queue space just went up from zero, wake */
192         if (atomic_inc_return(&brvcc->qspace) == 1)
193                 netif_wake_queue(brvcc->device);
194 }
195 
196 /*
197  * Send a packet out a particular vcc.  Not to useful right now, but paves
198  * the way for multiple vcc's per itf.  Returns true if we can send,
199  * otherwise false
200  */
201 static int br2684_xmit_vcc(struct sk_buff *skb, struct net_device *dev,
202                            struct br2684_vcc *brvcc)
203 {
204         struct br2684_dev *brdev = BRPRIV(dev);
205         struct atm_vcc *atmvcc;
206         int minheadroom = (brvcc->encaps == e_llc) ?
207                 ((brdev->payload == p_bridged) ?
208                         sizeof(llc_oui_pid_pad) : sizeof(llc_oui_ipv4)) :
209                 ((brdev->payload == p_bridged) ? BR2684_PAD_LEN : 0);
210 
211         if (skb_headroom(skb) < minheadroom) {
212                 struct sk_buff *skb2 = skb_realloc_headroom(skb, minheadroom);
213                 brvcc->copies_needed++;
214                 dev_kfree_skb(skb);
215                 if (skb2 == NULL) {
216                         brvcc->copies_failed++;
217                         return 0;
218                 }
219                 skb = skb2;
220         }
221 
222         if (brvcc->encaps == e_llc) {
223                 if (brdev->payload == p_bridged) {
224                         skb_push(skb, sizeof(llc_oui_pid_pad));
225                         skb_copy_to_linear_data(skb, llc_oui_pid_pad,
226                                                 sizeof(llc_oui_pid_pad));
227                 } else if (brdev->payload == p_routed) {
228                         unsigned short prot = ntohs(skb->protocol);
229 
230                         skb_push(skb, sizeof(llc_oui_ipv4));
231                         switch (prot) {
232                         case ETH_P_IP:
233                                 skb_copy_to_linear_data(skb, llc_oui_ipv4,
234                                                         sizeof(llc_oui_ipv4));
235                                 break;
236                         case ETH_P_IPV6:
237                                 skb_copy_to_linear_data(skb, llc_oui_ipv6,
238                                                         sizeof(llc_oui_ipv6));
239                                 break;
240                         default:
241                                 dev_kfree_skb(skb);
242                                 return 0;
243                         }
244                 }
245         } else { /* e_vc */
246                 if (brdev->payload == p_bridged) {
247                         skb_push(skb, 2);
248                         memset(skb->data, 0, 2);
249                 }
250         }
251         skb_debug(skb);
252 
253         ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc;
254         pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev);
255         atm_account_tx(atmvcc, skb);
256         dev->stats.tx_packets++;
257         dev->stats.tx_bytes += skb->len;
258 
259         if (atomic_dec_return(&brvcc->qspace) < 1) {
260                 /* No more please! */
261                 netif_stop_queue(brvcc->device);
262                 /* We might have raced with br2684_pop() */
263                 if (unlikely(atomic_read(&brvcc->qspace) > 0))
264                         netif_wake_queue(brvcc->device);
265         }
266 
267         /* If this fails immediately, the skb will be freed and br2684_pop()
268            will wake the queue if appropriate. Just return an error so that
269            the stats are updated correctly */
270         return !atmvcc->send(atmvcc, skb);
271 }
272 
273 static void br2684_release_cb(struct atm_vcc *atmvcc)
274 {
275         struct br2684_vcc *brvcc = BR2684_VCC(atmvcc);
276 
277         if (atomic_read(&brvcc->qspace) > 0)
278                 netif_wake_queue(brvcc->device);
279 
280         if (brvcc->old_release_cb)
281                 brvcc->old_release_cb(atmvcc);
282 }
283 
284 static inline struct br2684_vcc *pick_outgoing_vcc(const struct sk_buff *skb,
285                                                    const struct br2684_dev *brdev)
286 {
287         return list_empty(&brdev->brvccs) ? NULL : list_entry_brvcc(brdev->brvccs.next);        /* 1 vcc/dev right now */
288 }
289 
290 static netdev_tx_t br2684_start_xmit(struct sk_buff *skb,
291                                      struct net_device *dev)
292 {
293         struct br2684_dev *brdev = BRPRIV(dev);
294         struct br2684_vcc *brvcc;
295         struct atm_vcc *atmvcc;
296         netdev_tx_t ret = NETDEV_TX_OK;
297 
298         pr_debug("skb_dst(skb)=%p\n", skb_dst(skb));
299         read_lock(&devs_lock);
300         brvcc = pick_outgoing_vcc(skb, brdev);
301         if (brvcc == NULL) {
302                 pr_debug("no vcc attached to dev %s\n", dev->name);
303                 dev->stats.tx_errors++;
304                 dev->stats.tx_carrier_errors++;
305                 /* netif_stop_queue(dev); */
306                 dev_kfree_skb(skb);
307                 goto out_devs;
308         }
309         atmvcc = brvcc->atmvcc;
310 
311         bh_lock_sock(sk_atm(atmvcc));
312 
313         if (test_bit(ATM_VF_RELEASED, &atmvcc->flags) ||
314             test_bit(ATM_VF_CLOSE, &atmvcc->flags) ||
315             !test_bit(ATM_VF_READY, &atmvcc->flags)) {
316                 dev->stats.tx_dropped++;
317                 dev_kfree_skb(skb);
318                 goto out;
319         }
320 
321         if (sock_owned_by_user(sk_atm(atmvcc))) {
322                 netif_stop_queue(brvcc->device);
323                 ret = NETDEV_TX_BUSY;
324                 goto out;
325         }
326 
327         if (!br2684_xmit_vcc(skb, dev, brvcc)) {
328                 /*
329                  * We should probably use netif_*_queue() here, but that
330                  * involves added complication.  We need to walk before
331                  * we can run.
332                  *
333                  * Don't free here! this pointer might be no longer valid!
334                  */
335                 dev->stats.tx_errors++;
336                 dev->stats.tx_fifo_errors++;
337         }
338  out:
339         bh_unlock_sock(sk_atm(atmvcc));
340  out_devs:
341         read_unlock(&devs_lock);
342         return ret;
343 }
344 
345 /*
346  * We remember when the MAC gets set, so we don't override it later with
347  * the ESI of the ATM card of the first VC
348  */
349 static int br2684_mac_addr(struct net_device *dev, void *p)
350 {
351         int err = eth_mac_addr(dev, p);
352         if (!err)
353                 BRPRIV(dev)->mac_was_set = 1;
354         return err;
355 }
356 
357 #ifdef CONFIG_ATM_BR2684_IPFILTER
358 /* this IOCTL is experimental. */
359 static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg)
360 {
361         struct br2684_vcc *brvcc;
362         struct br2684_filter_set fs;
363 
364         if (copy_from_user(&fs, arg, sizeof fs))
365                 return -EFAULT;
366         if (fs.ifspec.method != BR2684_FIND_BYNOTHING) {
367                 /*
368                  * This is really a per-vcc thing, but we can also search
369                  * by device.
370                  */
371                 struct br2684_dev *brdev;
372                 read_lock(&devs_lock);
373                 brdev = BRPRIV(br2684_find_dev(&fs.ifspec));
374                 if (brdev == NULL || list_empty(&brdev->brvccs) ||
375                     brdev->brvccs.next != brdev->brvccs.prev)   /* >1 VCC */
376                         brvcc = NULL;
377                 else
378                         brvcc = list_entry_brvcc(brdev->brvccs.next);
379                 read_unlock(&devs_lock);
380                 if (brvcc == NULL)
381                         return -ESRCH;
382         } else
383                 brvcc = BR2684_VCC(atmvcc);
384         memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter));
385         return 0;
386 }
387 
388 /* Returns 1 if packet should be dropped */
389 static inline int
390 packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb)
391 {
392         if (brvcc->filter.netmask == 0)
393                 return 0;       /* no filter in place */
394         if (type == htons(ETH_P_IP) &&
395             (((struct iphdr *)(skb->data))->daddr & brvcc->filter.
396              netmask) == brvcc->filter.prefix)
397                 return 0;
398         if (type == htons(ETH_P_ARP))
399                 return 0;
400         /*
401          * TODO: we should probably filter ARPs too.. don't want to have
402          * them returning values that don't make sense, or is that ok?
403          */
404         return 1;               /* drop */
405 }
406 #endif /* CONFIG_ATM_BR2684_IPFILTER */
407 
408 static void br2684_close_vcc(struct br2684_vcc *brvcc)
409 {
410         pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device);
411         write_lock_irq(&devs_lock);
412         list_del(&brvcc->brvccs);
413         write_unlock_irq(&devs_lock);
414         brvcc->atmvcc->user_back = NULL;        /* what about vcc->recvq ??? */
415         brvcc->atmvcc->release_cb = brvcc->old_release_cb;
416         brvcc->old_push(brvcc->atmvcc, NULL);   /* pass on the bad news */
417         module_put(brvcc->old_owner);
418         kfree(brvcc);
419 }
420 
421 /* when AAL5 PDU comes in: */
422 static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb)
423 {
424         struct br2684_vcc *brvcc = BR2684_VCC(atmvcc);
425         struct net_device *net_dev = brvcc->device;
426         struct br2684_dev *brdev = BRPRIV(net_dev);
427 
428         pr_debug("\n");
429 
430         if (unlikely(skb == NULL)) {
431                 /* skb==NULL means VCC is being destroyed */
432                 br2684_close_vcc(brvcc);
433                 if (list_empty(&brdev->brvccs)) {
434                         write_lock_irq(&devs_lock);
435                         list_del(&brdev->br2684_devs);
436                         write_unlock_irq(&devs_lock);
437                         unregister_netdev(net_dev);
438                         free_netdev(net_dev);
439                 }
440                 return;
441         }
442 
443         skb_debug(skb);
444         atm_return(atmvcc, skb->truesize);
445         pr_debug("skb from brdev %p\n", brdev);
446         if (brvcc->encaps == e_llc) {
447 
448                 if (skb->len > 7 && skb->data[7] == 0x01)
449                         __skb_trim(skb, skb->len - 4);
450 
451                 /* accept packets that have "ipv[46]" in the snap header */
452                 if ((skb->len >= (sizeof(llc_oui_ipv4))) &&
453                     (memcmp(skb->data, llc_oui_ipv4,
454                             sizeof(llc_oui_ipv4) - BR2684_ETHERTYPE_LEN) == 0)) {
455                         if (memcmp(skb->data + 6, ethertype_ipv6,
456                                    sizeof(ethertype_ipv6)) == 0)
457                                 skb->protocol = htons(ETH_P_IPV6);
458                         else if (memcmp(skb->data + 6, ethertype_ipv4,
459                                         sizeof(ethertype_ipv4)) == 0)
460                                 skb->protocol = htons(ETH_P_IP);
461                         else
462                                 goto error;
463                         skb_pull(skb, sizeof(llc_oui_ipv4));
464                         skb_reset_network_header(skb);
465                         skb->pkt_type = PACKET_HOST;
466                 /*
467                  * Let us waste some time for checking the encapsulation.
468                  * Note, that only 7 char is checked so frames with a valid FCS
469                  * are also accepted (but FCS is not checked of course).
470                  */
471                 } else if ((skb->len >= sizeof(llc_oui_pid_pad)) &&
472                            (memcmp(skb->data, llc_oui_pid_pad, 7) == 0)) {
473                         skb_pull(skb, sizeof(llc_oui_pid_pad));
474                         skb->protocol = eth_type_trans(skb, net_dev);
475                 } else
476                         goto error;
477 
478         } else { /* e_vc */
479                 if (brdev->payload == p_routed) {
480                         struct iphdr *iph;
481 
482                         skb_reset_network_header(skb);
483                         iph = ip_hdr(skb);
484                         if (iph->version == 4)
485                                 skb->protocol = htons(ETH_P_IP);
486                         else if (iph->version == 6)
487                                 skb->protocol = htons(ETH_P_IPV6);
488                         else
489                                 goto error;
490                         skb->pkt_type = PACKET_HOST;
491                 } else { /* p_bridged */
492                         /* first 2 chars should be 0 */
493                         if (memcmp(skb->data, pad, BR2684_PAD_LEN) != 0)
494                                 goto error;
495                         skb_pull(skb, BR2684_PAD_LEN);
496                         skb->protocol = eth_type_trans(skb, net_dev);
497                 }
498         }
499 
500 #ifdef CONFIG_ATM_BR2684_IPFILTER
501         if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb)))
502                 goto dropped;
503 #endif /* CONFIG_ATM_BR2684_IPFILTER */
504         skb->dev = net_dev;
505         ATM_SKB(skb)->vcc = atmvcc;     /* needed ? */
506         pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol));
507         skb_debug(skb);
508         /* sigh, interface is down? */
509         if (unlikely(!(net_dev->flags & IFF_UP)))
510                 goto dropped;
511         net_dev->stats.rx_packets++;
512         net_dev->stats.rx_bytes += skb->len;
513         memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
514         netif_rx(skb);
515         return;
516 
517 dropped:
518         net_dev->stats.rx_dropped++;
519         goto free_skb;
520 error:
521         net_dev->stats.rx_errors++;
522 free_skb:
523         dev_kfree_skb(skb);
524 }
525 
526 /*
527  * Assign a vcc to a dev
528  * Note: we do not have explicit unassign, but look at _push()
529  */
530 static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg)
531 {
532         struct br2684_vcc *brvcc;
533         struct br2684_dev *brdev;
534         struct net_device *net_dev;
535         struct atm_backend_br2684 be;
536         int err;
537 
538         if (copy_from_user(&be, arg, sizeof be))
539                 return -EFAULT;
540         brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL);
541         if (!brvcc)
542                 return -ENOMEM;
543         /*
544          * Allow two packets in the ATM queue. One actually being sent, and one
545          * for the ATM 'TX done' handler to send. It shouldn't take long to get
546          * the next one from the netdev queue, when we need it. More than that
547          * would be bufferbloat.
548          */
549         atomic_set(&brvcc->qspace, 2);
550         write_lock_irq(&devs_lock);
551         net_dev = br2684_find_dev(&be.ifspec);
552         if (net_dev == NULL) {
553                 pr_err("tried to attach to non-existent device\n");
554                 err = -ENXIO;
555                 goto error;
556         }
557         brdev = BRPRIV(net_dev);
558         if (atmvcc->push == NULL) {
559                 err = -EBADFD;
560                 goto error;
561         }
562         if (!list_empty(&brdev->brvccs)) {
563                 /* Only 1 VCC/dev right now */
564                 err = -EEXIST;
565                 goto error;
566         }
567         if (be.fcs_in != BR2684_FCSIN_NO ||
568             be.fcs_out != BR2684_FCSOUT_NO ||
569             be.fcs_auto || be.has_vpiid || be.send_padding ||
570             (be.encaps != BR2684_ENCAPS_VC &&
571              be.encaps != BR2684_ENCAPS_LLC) ||
572             be.min_size != 0) {
573                 err = -EINVAL;
574                 goto error;
575         }
576         pr_debug("vcc=%p, encaps=%d, brvcc=%p\n", atmvcc, be.encaps, brvcc);
577         if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) {
578                 unsigned char *esi = atmvcc->dev->esi;
579                 if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5])
580                         memcpy(net_dev->dev_addr, esi, net_dev->addr_len);
581                 else
582                         net_dev->dev_addr[2] = 1;
583         }
584         list_add(&brvcc->brvccs, &brdev->brvccs);
585         write_unlock_irq(&devs_lock);
586         brvcc->device = net_dev;
587         brvcc->atmvcc = atmvcc;
588         atmvcc->user_back = brvcc;
589         brvcc->encaps = (enum br2684_encaps)be.encaps;
590         brvcc->old_push = atmvcc->push;
591         brvcc->old_pop = atmvcc->pop;
592         brvcc->old_release_cb = atmvcc->release_cb;
593         brvcc->old_owner = atmvcc->owner;
594         barrier();
595         atmvcc->push = br2684_push;
596         atmvcc->pop = br2684_pop;
597         atmvcc->release_cb = br2684_release_cb;
598         atmvcc->owner = THIS_MODULE;
599 
600         /* initialize netdev carrier state */
601         if (atmvcc->dev->signal == ATM_PHY_SIG_LOST)
602                 netif_carrier_off(net_dev);
603         else
604                 netif_carrier_on(net_dev);
605 
606         __module_get(THIS_MODULE);
607 
608         /* re-process everything received between connection setup and
609            backend setup */
610         vcc_process_recv_queue(atmvcc);
611         return 0;
612 
613 error:
614         write_unlock_irq(&devs_lock);
615         kfree(brvcc);
616         return err;
617 }
618 
619 static const struct net_device_ops br2684_netdev_ops = {
620         .ndo_start_xmit         = br2684_start_xmit,
621         .ndo_set_mac_address    = br2684_mac_addr,
622         .ndo_validate_addr      = eth_validate_addr,
623 };
624 
625 static const struct net_device_ops br2684_netdev_ops_routed = {
626         .ndo_start_xmit         = br2684_start_xmit,
627         .ndo_set_mac_address    = br2684_mac_addr,
628 };
629 
630 static void br2684_setup(struct net_device *netdev)
631 {
632         struct br2684_dev *brdev = BRPRIV(netdev);
633 
634         ether_setup(netdev);
635         netdev->hard_header_len += sizeof(llc_oui_pid_pad); /* worst case */
636         brdev->net_dev = netdev;
637 
638         netdev->netdev_ops = &br2684_netdev_ops;
639 
640         INIT_LIST_HEAD(&brdev->brvccs);
641 }
642 
643 static void br2684_setup_routed(struct net_device *netdev)
644 {
645         struct br2684_dev *brdev = BRPRIV(netdev);
646 
647         brdev->net_dev = netdev;
648         netdev->hard_header_len = sizeof(llc_oui_ipv4); /* worst case */
649         netdev->netdev_ops = &br2684_netdev_ops_routed;
650         netdev->addr_len = 0;
651         netdev->mtu = ETH_DATA_LEN;
652         netdev->min_mtu = 0;
653         netdev->max_mtu = ETH_MAX_MTU;
654         netdev->type = ARPHRD_PPP;
655         netdev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
656         netdev->tx_queue_len = 100;
657         INIT_LIST_HEAD(&brdev->brvccs);
658 }
659 
660 static int br2684_create(void __user *arg)
661 {
662         int err;
663         struct net_device *netdev;
664         struct br2684_dev *brdev;
665         struct atm_newif_br2684 ni;
666         enum br2684_payload payload;
667 
668         pr_debug("\n");
669 
670         if (copy_from_user(&ni, arg, sizeof ni))
671                 return -EFAULT;
672 
673         if (ni.media & BR2684_FLAG_ROUTED)
674                 payload = p_routed;
675         else
676                 payload = p_bridged;
677         ni.media &= 0xffff;     /* strip flags */
678 
679         if (ni.media != BR2684_MEDIA_ETHERNET || ni.mtu != 1500)
680                 return -EINVAL;
681 
682         netdev = alloc_netdev(sizeof(struct br2684_dev),
683                               ni.ifname[0] ? ni.ifname : "nas%d",
684                               NET_NAME_UNKNOWN,
685                               (payload == p_routed) ? br2684_setup_routed : br2684_setup);
686         if (!netdev)
687                 return -ENOMEM;
688 
689         brdev = BRPRIV(netdev);
690 
691         pr_debug("registered netdev %s\n", netdev->name);
692         /* open, stop, do_ioctl ? */
693         err = register_netdev(netdev);
694         if (err < 0) {
695                 pr_err("register_netdev failed\n");
696                 free_netdev(netdev);
697                 return err;
698         }
699 
700         write_lock_irq(&devs_lock);
701 
702         brdev->payload = payload;
703 
704         if (list_empty(&br2684_devs)) {
705                 /* 1st br2684 device */
706                 brdev->number = 1;
707         } else
708                 brdev->number = BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1;
709 
710         list_add_tail(&brdev->br2684_devs, &br2684_devs);
711         write_unlock_irq(&devs_lock);
712         return 0;
713 }
714 
715 /*
716  * This handles ioctls actually performed on our vcc - we must return
717  * -ENOIOCTLCMD for any unrecognized ioctl
718  */
719 static int br2684_ioctl(struct socket *sock, unsigned int cmd,
720                         unsigned long arg)
721 {
722         struct atm_vcc *atmvcc = ATM_SD(sock);
723         void __user *argp = (void __user *)arg;
724         atm_backend_t b;
725 
726         int err;
727         switch (cmd) {
728         case ATM_SETBACKEND:
729         case ATM_NEWBACKENDIF:
730                 err = get_user(b, (atm_backend_t __user *) argp);
731                 if (err)
732                         return -EFAULT;
733                 if (b != ATM_BACKEND_BR2684)
734                         return -ENOIOCTLCMD;
735                 if (!capable(CAP_NET_ADMIN))
736                         return -EPERM;
737                 if (cmd == ATM_SETBACKEND) {
738                         if (sock->state != SS_CONNECTED)
739                                 return -EINVAL;
740                         return br2684_regvcc(atmvcc, argp);
741                 } else {
742                         return br2684_create(argp);
743                 }
744 #ifdef CONFIG_ATM_BR2684_IPFILTER
745         case BR2684_SETFILT:
746                 if (atmvcc->push != br2684_push)
747                         return -ENOIOCTLCMD;
748                 if (!capable(CAP_NET_ADMIN))
749                         return -EPERM;
750                 err = br2684_setfilt(atmvcc, argp);
751 
752                 return err;
753 #endif /* CONFIG_ATM_BR2684_IPFILTER */
754         }
755         return -ENOIOCTLCMD;
756 }
757 
758 static struct atm_ioctl br2684_ioctl_ops = {
759         .owner = THIS_MODULE,
760         .ioctl = br2684_ioctl,
761 };
762 
763 #ifdef CONFIG_PROC_FS
764 static void *br2684_seq_start(struct seq_file *seq, loff_t * pos)
765         __acquires(devs_lock)
766 {
767         read_lock(&devs_lock);
768         return seq_list_start(&br2684_devs, *pos);
769 }
770 
771 static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t * pos)
772 {
773         return seq_list_next(v, &br2684_devs, pos);
774 }
775 
776 static void br2684_seq_stop(struct seq_file *seq, void *v)
777         __releases(devs_lock)
778 {
779         read_unlock(&devs_lock);
780 }
781 
782 static int br2684_seq_show(struct seq_file *seq, void *v)
783 {
784         const struct br2684_dev *brdev = list_entry(v, struct br2684_dev,
785                                                     br2684_devs);
786         const struct net_device *net_dev = brdev->net_dev;
787         const struct br2684_vcc *brvcc;
788 
789         seq_printf(seq, "dev %.16s: num=%d, mac=%pM (%s)\n",
790                    net_dev->name,
791                    brdev->number,
792                    net_dev->dev_addr,
793                    brdev->mac_was_set ? "set" : "auto");
794 
795         list_for_each_entry(brvcc, &brdev->brvccs, brvccs) {
796                 seq_printf(seq, "  vcc %d.%d.%d: encaps=%s payload=%s"
797                            ", failed copies %u/%u"
798                            "\n", brvcc->atmvcc->dev->number,
799                            brvcc->atmvcc->vpi, brvcc->atmvcc->vci,
800                            (brvcc->encaps == e_llc) ? "LLC" : "VC",
801                            (brdev->payload == p_bridged) ? "bridged" : "routed",
802                            brvcc->copies_failed, brvcc->copies_needed);
803 #ifdef CONFIG_ATM_BR2684_IPFILTER
804                 if (brvcc->filter.netmask != 0)
805                         seq_printf(seq, "    filter=%pI4/%pI4\n",
806                                    &brvcc->filter.prefix,
807                                    &brvcc->filter.netmask);
808 #endif /* CONFIG_ATM_BR2684_IPFILTER */
809         }
810         return 0;
811 }
812 
813 static const struct seq_operations br2684_seq_ops = {
814         .start = br2684_seq_start,
815         .next = br2684_seq_next,
816         .stop = br2684_seq_stop,
817         .show = br2684_seq_show,
818 };
819 
820 extern struct proc_dir_entry *atm_proc_root;    /* from proc.c */
821 #endif /* CONFIG_PROC_FS */
822 
823 static int __init br2684_init(void)
824 {
825 #ifdef CONFIG_PROC_FS
826         struct proc_dir_entry *p;
827         p = proc_create_seq("br2684", 0, atm_proc_root, &br2684_seq_ops);
828         if (p == NULL)
829                 return -ENOMEM;
830 #endif
831         register_atm_ioctl(&br2684_ioctl_ops);
832         register_atmdevice_notifier(&atm_dev_notifier);
833         return 0;
834 }
835 
836 static void __exit br2684_exit(void)
837 {
838         struct net_device *net_dev;
839         struct br2684_dev *brdev;
840         struct br2684_vcc *brvcc;
841         deregister_atm_ioctl(&br2684_ioctl_ops);
842 
843 #ifdef CONFIG_PROC_FS
844         remove_proc_entry("br2684", atm_proc_root);
845 #endif
846 
847 
848         unregister_atmdevice_notifier(&atm_dev_notifier);
849 
850         while (!list_empty(&br2684_devs)) {
851                 net_dev = list_entry_brdev(br2684_devs.next);
852                 brdev = BRPRIV(net_dev);
853                 while (!list_empty(&brdev->brvccs)) {
854                         brvcc = list_entry_brvcc(brdev->brvccs.next);
855                         br2684_close_vcc(brvcc);
856                 }
857 
858                 list_del(&brdev->br2684_devs);
859                 unregister_netdev(net_dev);
860                 free_netdev(net_dev);
861         }
862 }
863 
864 module_init(br2684_init);
865 module_exit(br2684_exit);
866 
867 MODULE_AUTHOR("Marcell GAL");
868 MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5");
869 MODULE_LICENSE("GPL");
870 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp