Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/net/atm/br2684.c
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
File MIME type: text/plain
File size: 22319 byte(s)
Tag kernel26-2.6.12-alx-r9
1 | /* |
2 | Experimental ethernet netdevice using ATM AAL5 as underlying carrier |
3 | (RFC1483 obsoleted by RFC2684) for Linux 2.4 |
4 | Author: Marcell GAL, 2000, XDSL Ltd, Hungary |
5 | */ |
6 | |
7 | #include <linux/module.h> |
8 | #include <linux/config.h> |
9 | #include <linux/init.h> |
10 | #include <linux/kernel.h> |
11 | #include <linux/list.h> |
12 | #include <linux/netdevice.h> |
13 | #include <linux/skbuff.h> |
14 | #include <linux/etherdevice.h> |
15 | #include <linux/rtnetlink.h> |
16 | #include <linux/ip.h> |
17 | #include <asm/uaccess.h> |
18 | #include <net/arp.h> |
19 | #include <linux/atm.h> |
20 | #include <linux/atmdev.h> |
21 | #include <linux/seq_file.h> |
22 | |
23 | #include <linux/atmbr2684.h> |
24 | |
25 | #include "common.h" |
26 | #include "ipcommon.h" |
27 | |
28 | /* |
29 | * Define this to use a version of the code which interacts with the higher |
30 | * layers in a more intellegent way, by always reserving enough space for |
31 | * our header at the begining of the packet. However, there may still be |
32 | * some problems with programs like tcpdump. In 2.5 we'll sort out what |
33 | * we need to do to get this perfect. For now we just will copy the packet |
34 | * if we need space for the header |
35 | */ |
36 | /* #define FASTER_VERSION */ |
37 | |
38 | #ifdef DEBUG |
39 | #define DPRINTK(format, args...) printk(KERN_DEBUG "br2684: " format, ##args) |
40 | #else |
41 | #define DPRINTK(format, args...) |
42 | #endif |
43 | |
44 | #ifdef SKB_DEBUG |
45 | static void skb_debug(const struct sk_buff *skb) |
46 | { |
47 | #define NUM2PRINT 50 |
48 | char buf[NUM2PRINT * 3 + 1]; /* 3 chars per byte */ |
49 | int i = 0; |
50 | for (i = 0; i < skb->len && i < NUM2PRINT; i++) { |
51 | sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]); |
52 | } |
53 | printk(KERN_DEBUG "br2684: skb: %s\n", buf); |
54 | } |
55 | #else |
56 | #define skb_debug(skb) do {} while (0) |
57 | #endif |
58 | |
59 | static unsigned char llc_oui_pid_pad[] = |
60 | { 0xAA, 0xAA, 0x03, 0x00, 0x80, 0xC2, 0x00, 0x07, 0x00, 0x00 }; |
61 | #define PADLEN (2) |
62 | |
63 | enum br2684_encaps { |
64 | e_vc = BR2684_ENCAPS_VC, |
65 | e_llc = BR2684_ENCAPS_LLC, |
66 | }; |
67 | |
68 | struct br2684_vcc { |
69 | struct atm_vcc *atmvcc; |
70 | struct net_device *device; |
71 | /* keep old push,pop functions for chaining */ |
72 | void (*old_push)(struct atm_vcc *vcc,struct sk_buff *skb); |
73 | /* void (*old_pop)(struct atm_vcc *vcc,struct sk_buff *skb); */ |
74 | enum br2684_encaps encaps; |
75 | struct list_head brvccs; |
76 | #ifdef CONFIG_ATM_BR2684_IPFILTER |
77 | struct br2684_filter filter; |
78 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ |
79 | #ifndef FASTER_VERSION |
80 | unsigned copies_needed, copies_failed; |
81 | #endif /* FASTER_VERSION */ |
82 | }; |
83 | |
84 | struct br2684_dev { |
85 | struct net_device *net_dev; |
86 | struct list_head br2684_devs; |
87 | int number; |
88 | struct list_head brvccs; /* one device <=> one vcc (before xmas) */ |
89 | struct net_device_stats stats; |
90 | int mac_was_set; |
91 | }; |
92 | |
93 | /* |
94 | * This lock should be held for writing any time the list of devices or |
95 | * their attached vcc's could be altered. It should be held for reading |
96 | * any time these are being queried. Note that we sometimes need to |
97 | * do read-locking under interrupt context, so write locking must block |
98 | * the current CPU's interrupts |
99 | */ |
100 | static DEFINE_RWLOCK(devs_lock); |
101 | |
102 | static LIST_HEAD(br2684_devs); |
103 | |
104 | static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev) |
105 | { |
106 | return (struct br2684_dev *) net_dev->priv; |
107 | } |
108 | |
109 | static inline struct net_device *list_entry_brdev(const struct list_head *le) |
110 | { |
111 | return list_entry(le, struct br2684_dev, br2684_devs)->net_dev; |
112 | } |
113 | |
114 | static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc) |
115 | { |
116 | return (struct br2684_vcc *) (atmvcc->user_back); |
117 | } |
118 | |
119 | static inline struct br2684_vcc *list_entry_brvcc(const struct list_head *le) |
120 | { |
121 | return list_entry(le, struct br2684_vcc, brvccs); |
122 | } |
123 | |
124 | /* Caller should hold read_lock(&devs_lock) */ |
125 | static struct net_device *br2684_find_dev(const struct br2684_if_spec *s) |
126 | { |
127 | struct list_head *lh; |
128 | struct net_device *net_dev; |
129 | switch (s->method) { |
130 | case BR2684_FIND_BYNUM: |
131 | list_for_each(lh, &br2684_devs) { |
132 | net_dev = list_entry_brdev(lh); |
133 | if (BRPRIV(net_dev)->number == s->spec.devnum) |
134 | return net_dev; |
135 | } |
136 | break; |
137 | case BR2684_FIND_BYIFNAME: |
138 | list_for_each(lh, &br2684_devs) { |
139 | net_dev = list_entry_brdev(lh); |
140 | if (!strncmp(net_dev->name, s->spec.ifname, IFNAMSIZ)) |
141 | return net_dev; |
142 | } |
143 | break; |
144 | } |
145 | return NULL; |
146 | } |
147 | |
148 | /* |
149 | * Send a packet out a particular vcc. Not to useful right now, but paves |
150 | * the way for multiple vcc's per itf. Returns true if we can send, |
151 | * otherwise false |
152 | */ |
153 | static int br2684_xmit_vcc(struct sk_buff *skb, struct br2684_dev *brdev, |
154 | struct br2684_vcc *brvcc) |
155 | { |
156 | struct atm_vcc *atmvcc; |
157 | #ifdef FASTER_VERSION |
158 | if (brvcc->encaps == e_llc) |
159 | memcpy(skb_push(skb, 8), llc_oui_pid_pad, 8); |
160 | /* last 2 bytes of llc_oui_pid_pad are managed by header routines; |
161 | yes, you got it: 8 + 2 = sizeof(llc_oui_pid_pad) |
162 | */ |
163 | #else |
164 | int minheadroom = (brvcc->encaps == e_llc) ? 10 : 2; |
165 | if (skb_headroom(skb) < minheadroom) { |
166 | struct sk_buff *skb2 = skb_realloc_headroom(skb, minheadroom); |
167 | brvcc->copies_needed++; |
168 | dev_kfree_skb(skb); |
169 | if (skb2 == NULL) { |
170 | brvcc->copies_failed++; |
171 | return 0; |
172 | } |
173 | skb = skb2; |
174 | } |
175 | skb_push(skb, minheadroom); |
176 | if (brvcc->encaps == e_llc) |
177 | memcpy(skb->data, llc_oui_pid_pad, 10); |
178 | else |
179 | memset(skb->data, 0, 2); |
180 | #endif /* FASTER_VERSION */ |
181 | skb_debug(skb); |
182 | |
183 | ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc; |
184 | DPRINTK("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev); |
185 | if (!atm_may_send(atmvcc, skb->truesize)) { |
186 | /* we free this here for now, because we cannot know in a higher |
187 | layer whether the skb point it supplied wasn't freed yet. |
188 | now, it always is. |
189 | */ |
190 | dev_kfree_skb(skb); |
191 | return 0; |
192 | } |
193 | atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc); |
194 | ATM_SKB(skb)->atm_options = atmvcc->atm_options; |
195 | brdev->stats.tx_packets++; |
196 | brdev->stats.tx_bytes += skb->len; |
197 | atmvcc->send(atmvcc, skb); |
198 | return 1; |
199 | } |
200 | |
201 | static inline struct br2684_vcc *pick_outgoing_vcc(struct sk_buff *skb, |
202 | struct br2684_dev *brdev) |
203 | { |
204 | return list_empty(&brdev->brvccs) ? NULL : |
205 | list_entry_brvcc(brdev->brvccs.next); /* 1 vcc/dev right now */ |
206 | } |
207 | |
208 | static int br2684_start_xmit(struct sk_buff *skb, struct net_device *dev) |
209 | { |
210 | struct br2684_dev *brdev = BRPRIV(dev); |
211 | struct br2684_vcc *brvcc; |
212 | |
213 | DPRINTK("br2684_start_xmit, skb->dst=%p\n", skb->dst); |
214 | read_lock(&devs_lock); |
215 | brvcc = pick_outgoing_vcc(skb, brdev); |
216 | if (brvcc == NULL) { |
217 | DPRINTK("no vcc attached to dev %s\n", dev->name); |
218 | brdev->stats.tx_errors++; |
219 | brdev->stats.tx_carrier_errors++; |
220 | /* netif_stop_queue(dev); */ |
221 | dev_kfree_skb(skb); |
222 | read_unlock(&devs_lock); |
223 | return -EUNATCH; |
224 | } |
225 | if (!br2684_xmit_vcc(skb, brdev, brvcc)) { |
226 | /* |
227 | * We should probably use netif_*_queue() here, but that |
228 | * involves added complication. We need to walk before |
229 | * we can run |
230 | */ |
231 | /* don't free here! this pointer might be no longer valid! |
232 | dev_kfree_skb(skb); |
233 | */ |
234 | brdev->stats.tx_errors++; |
235 | brdev->stats.tx_fifo_errors++; |
236 | } |
237 | read_unlock(&devs_lock); |
238 | return 0; |
239 | } |
240 | |
241 | static struct net_device_stats *br2684_get_stats(struct net_device *dev) |
242 | { |
243 | DPRINTK("br2684_get_stats\n"); |
244 | return &BRPRIV(dev)->stats; |
245 | } |
246 | |
247 | #ifdef FASTER_VERSION |
248 | /* |
249 | * These mirror eth_header and eth_header_cache. They are not usually |
250 | * exported for use in modules, so we grab them from net_device |
251 | * after ether_setup() is done with it. Bit of a hack. |
252 | */ |
253 | static int (*my_eth_header)(struct sk_buff *, struct net_device *, |
254 | unsigned short, void *, void *, unsigned); |
255 | static int (*my_eth_header_cache)(struct neighbour *, struct hh_cache *); |
256 | |
257 | static int |
258 | br2684_header(struct sk_buff *skb, struct net_device *dev, |
259 | unsigned short type, void *daddr, void *saddr, unsigned len) |
260 | { |
261 | u16 *pad_before_eth; |
262 | int t = my_eth_header(skb, dev, type, daddr, saddr, len); |
263 | if (t > 0) { |
264 | pad_before_eth = (u16 *) skb_push(skb, 2); |
265 | *pad_before_eth = 0; |
266 | return dev->hard_header_len; /* or return 16; ? */ |
267 | } else |
268 | return t; |
269 | } |
270 | |
271 | static int |
272 | br2684_header_cache(struct neighbour *neigh, struct hh_cache *hh) |
273 | { |
274 | /* hh_data is 16 bytes long. if encaps is ether-llc we need 24, so |
275 | xmit will add the additional header part in that case */ |
276 | u16 *pad_before_eth = (u16 *)(hh->hh_data); |
277 | int t = my_eth_header_cache(neigh, hh); |
278 | DPRINTK("br2684_header_cache, neigh=%p, hh_cache=%p\n", neigh, hh); |
279 | if (t < 0) |
280 | return t; |
281 | else { |
282 | *pad_before_eth = 0; |
283 | hh->hh_len = PADLEN + ETH_HLEN; |
284 | } |
285 | return 0; |
286 | } |
287 | |
288 | /* |
289 | * This is similar to eth_type_trans, which cannot be used because of |
290 | * our dev->hard_header_len |
291 | */ |
292 | static inline unsigned short br_type_trans(struct sk_buff *skb, |
293 | struct net_device *dev) |
294 | { |
295 | struct ethhdr *eth; |
296 | unsigned char *rawp; |
297 | eth = eth_hdr(skb); |
298 | |
299 | if (*eth->h_dest & 1) { |
300 | if (memcmp(eth->h_dest, dev->broadcast, ETH_ALEN) == 0) |
301 | skb->pkt_type = PACKET_BROADCAST; |
302 | else |
303 | skb->pkt_type = PACKET_MULTICAST; |
304 | } |
305 | |
306 | else if (memcmp(eth->h_dest, dev->dev_addr, ETH_ALEN)) |
307 | skb->pkt_type = PACKET_OTHERHOST; |
308 | |
309 | if (ntohs(eth->h_proto) >= 1536) |
310 | return eth->h_proto; |
311 | |
312 | rawp = skb->data; |
313 | |
314 | /* |
315 | * This is a magic hack to spot IPX packets. Older Novell breaks |
316 | * the protocol design and runs IPX over 802.3 without an 802.2 LLC |
317 | * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This |
318 | * won't work for fault tolerant netware but does for the rest. |
319 | */ |
320 | if (*(unsigned short *) rawp == 0xFFFF) |
321 | return htons(ETH_P_802_3); |
322 | |
323 | /* |
324 | * Real 802.2 LLC |
325 | */ |
326 | return htons(ETH_P_802_2); |
327 | } |
328 | #endif /* FASTER_VERSION */ |
329 | |
330 | /* |
331 | * We remember when the MAC gets set, so we don't override it later with |
332 | * the ESI of the ATM card of the first VC |
333 | */ |
334 | static int (*my_eth_mac_addr)(struct net_device *, void *); |
335 | static int br2684_mac_addr(struct net_device *dev, void *p) |
336 | { |
337 | int err = my_eth_mac_addr(dev, p); |
338 | if (!err) |
339 | BRPRIV(dev)->mac_was_set = 1; |
340 | return err; |
341 | } |
342 | |
343 | #ifdef CONFIG_ATM_BR2684_IPFILTER |
344 | /* this IOCTL is experimental. */ |
345 | static int br2684_setfilt(struct atm_vcc *atmvcc, void __user *arg) |
346 | { |
347 | struct br2684_vcc *brvcc; |
348 | struct br2684_filter_set fs; |
349 | |
350 | if (copy_from_user(&fs, arg, sizeof fs)) |
351 | return -EFAULT; |
352 | if (fs.ifspec.method != BR2684_FIND_BYNOTHING) { |
353 | /* |
354 | * This is really a per-vcc thing, but we can also search |
355 | * by device |
356 | */ |
357 | struct br2684_dev *brdev; |
358 | read_lock(&devs_lock); |
359 | brdev = BRPRIV(br2684_find_dev(&fs.ifspec)); |
360 | if (brdev == NULL || list_empty(&brdev->brvccs) || |
361 | brdev->brvccs.next != brdev->brvccs.prev) /* >1 VCC */ |
362 | brvcc = NULL; |
363 | else |
364 | brvcc = list_entry_brvcc(brdev->brvccs.next); |
365 | read_unlock(&devs_lock); |
366 | if (brvcc == NULL) |
367 | return -ESRCH; |
368 | } else |
369 | brvcc = BR2684_VCC(atmvcc); |
370 | memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter)); |
371 | return 0; |
372 | } |
373 | |
374 | /* Returns 1 if packet should be dropped */ |
375 | static inline int |
376 | packet_fails_filter(u16 type, struct br2684_vcc *brvcc, struct sk_buff *skb) |
377 | { |
378 | if (brvcc->filter.netmask == 0) |
379 | return 0; /* no filter in place */ |
380 | if (type == __constant_htons(ETH_P_IP) && |
381 | (((struct iphdr *) (skb->data))->daddr & brvcc->filter. |
382 | netmask) == brvcc->filter.prefix) |
383 | return 0; |
384 | if (type == __constant_htons(ETH_P_ARP)) |
385 | return 0; |
386 | /* TODO: we should probably filter ARPs too.. don't want to have |
387 | * them returning values that don't make sense, or is that ok? |
388 | */ |
389 | return 1; /* drop */ |
390 | } |
391 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ |
392 | |
393 | static void br2684_close_vcc(struct br2684_vcc *brvcc) |
394 | { |
395 | DPRINTK("removing VCC %p from dev %p\n", brvcc, brvcc->device); |
396 | write_lock_irq(&devs_lock); |
397 | list_del(&brvcc->brvccs); |
398 | write_unlock_irq(&devs_lock); |
399 | brvcc->atmvcc->user_back = NULL; /* what about vcc->recvq ??? */ |
400 | brvcc->old_push(brvcc->atmvcc, NULL); /* pass on the bad news */ |
401 | kfree(brvcc); |
402 | module_put(THIS_MODULE); |
403 | } |
404 | |
405 | /* when AAL5 PDU comes in: */ |
406 | static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb) |
407 | { |
408 | struct br2684_vcc *brvcc = BR2684_VCC(atmvcc); |
409 | struct net_device *net_dev = brvcc->device; |
410 | struct br2684_dev *brdev = BRPRIV(net_dev); |
411 | int plen = sizeof(llc_oui_pid_pad) + ETH_HLEN; |
412 | |
413 | DPRINTK("br2684_push\n"); |
414 | |
415 | if (unlikely(skb == NULL)) { |
416 | /* skb==NULL means VCC is being destroyed */ |
417 | br2684_close_vcc(brvcc); |
418 | if (list_empty(&brdev->brvccs)) { |
419 | read_lock(&devs_lock); |
420 | list_del(&brdev->br2684_devs); |
421 | read_unlock(&devs_lock); |
422 | unregister_netdev(net_dev); |
423 | free_netdev(net_dev); |
424 | } |
425 | return; |
426 | } |
427 | |
428 | skb_debug(skb); |
429 | atm_return(atmvcc, skb->truesize); |
430 | DPRINTK("skb from brdev %p\n", brdev); |
431 | if (brvcc->encaps == e_llc) { |
432 | /* let us waste some time for checking the encapsulation. |
433 | Note, that only 7 char is checked so frames with a valid FCS |
434 | are also accepted (but FCS is not checked of course) */ |
435 | if (memcmp(skb->data, llc_oui_pid_pad, 7)) { |
436 | brdev->stats.rx_errors++; |
437 | dev_kfree_skb(skb); |
438 | return; |
439 | } |
440 | |
441 | /* Strip FCS if present */ |
442 | if (skb->len > 7 && skb->data[7] == 0x01) |
443 | __skb_trim(skb, skb->len - 4); |
444 | } else { |
445 | plen = PADLEN + ETH_HLEN; /* pad, dstmac,srcmac, ethtype */ |
446 | /* first 2 chars should be 0 */ |
447 | if (*((u16 *) (skb->data)) != 0) { |
448 | brdev->stats.rx_errors++; |
449 | dev_kfree_skb(skb); |
450 | return; |
451 | } |
452 | } |
453 | if (skb->len < plen) { |
454 | brdev->stats.rx_errors++; |
455 | dev_kfree_skb(skb); /* dev_ not needed? */ |
456 | return; |
457 | } |
458 | |
459 | #ifdef FASTER_VERSION |
460 | /* FIXME: tcpdump shows that pointer to mac header is 2 bytes earlier, |
461 | than should be. What else should I set? */ |
462 | skb_pull(skb, plen); |
463 | skb->mac.raw = ((char *) (skb->data)) - ETH_HLEN; |
464 | skb->pkt_type = PACKET_HOST; |
465 | #ifdef CONFIG_BR2684_FAST_TRANS |
466 | skb->protocol = ((u16 *) skb->data)[-1]; |
467 | #else /* some protocols might require this: */ |
468 | skb->protocol = br_type_trans(skb, net_dev); |
469 | #endif /* CONFIG_BR2684_FAST_TRANS */ |
470 | #else |
471 | skb_pull(skb, plen - ETH_HLEN); |
472 | skb->protocol = eth_type_trans(skb, net_dev); |
473 | #endif /* FASTER_VERSION */ |
474 | #ifdef CONFIG_ATM_BR2684_IPFILTER |
475 | if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb))) { |
476 | brdev->stats.rx_dropped++; |
477 | dev_kfree_skb(skb); |
478 | return; |
479 | } |
480 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ |
481 | skb->dev = net_dev; |
482 | ATM_SKB(skb)->vcc = atmvcc; /* needed ? */ |
483 | DPRINTK("received packet's protocol: %x\n", ntohs(skb->protocol)); |
484 | skb_debug(skb); |
485 | if (unlikely(!(net_dev->flags & IFF_UP))) { |
486 | /* sigh, interface is down */ |
487 | brdev->stats.rx_dropped++; |
488 | dev_kfree_skb(skb); |
489 | return; |
490 | } |
491 | brdev->stats.rx_packets++; |
492 | brdev->stats.rx_bytes += skb->len; |
493 | memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); |
494 | netif_rx(skb); |
495 | } |
496 | |
497 | static int br2684_regvcc(struct atm_vcc *atmvcc, void __user *arg) |
498 | { |
499 | /* assign a vcc to a dev |
500 | Note: we do not have explicit unassign, but look at _push() |
501 | */ |
502 | int err; |
503 | struct br2684_vcc *brvcc; |
504 | struct sk_buff_head copy; |
505 | struct sk_buff *skb; |
506 | struct br2684_dev *brdev; |
507 | struct net_device *net_dev; |
508 | struct atm_backend_br2684 be; |
509 | |
510 | if (copy_from_user(&be, arg, sizeof be)) |
511 | return -EFAULT; |
512 | brvcc = kmalloc(sizeof(struct br2684_vcc), GFP_KERNEL); |
513 | if (!brvcc) |
514 | return -ENOMEM; |
515 | memset(brvcc, 0, sizeof(struct br2684_vcc)); |
516 | write_lock_irq(&devs_lock); |
517 | net_dev = br2684_find_dev(&be.ifspec); |
518 | if (net_dev == NULL) { |
519 | printk(KERN_ERR |
520 | "br2684: tried to attach to non-existant device\n"); |
521 | err = -ENXIO; |
522 | goto error; |
523 | } |
524 | brdev = BRPRIV(net_dev); |
525 | if (atmvcc->push == NULL) { |
526 | err = -EBADFD; |
527 | goto error; |
528 | } |
529 | if (!list_empty(&brdev->brvccs)) { |
530 | /* Only 1 VCC/dev right now */ |
531 | err = -EEXIST; |
532 | goto error; |
533 | } |
534 | if (be.fcs_in != BR2684_FCSIN_NO || be.fcs_out != BR2684_FCSOUT_NO || |
535 | be.fcs_auto || be.has_vpiid || be.send_padding || (be.encaps != |
536 | BR2684_ENCAPS_VC && be.encaps != BR2684_ENCAPS_LLC) || |
537 | be.min_size != 0) { |
538 | err = -EINVAL; |
539 | goto error; |
540 | } |
541 | DPRINTK("br2684_regvcc vcc=%p, encaps=%d, brvcc=%p\n", atmvcc, be.encaps, |
542 | brvcc); |
543 | if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) { |
544 | unsigned char *esi = atmvcc->dev->esi; |
545 | if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5]) |
546 | memcpy(net_dev->dev_addr, esi, net_dev->addr_len); |
547 | else |
548 | net_dev->dev_addr[2] = 1; |
549 | } |
550 | list_add(&brvcc->brvccs, &brdev->brvccs); |
551 | write_unlock_irq(&devs_lock); |
552 | brvcc->device = net_dev; |
553 | brvcc->atmvcc = atmvcc; |
554 | atmvcc->user_back = brvcc; |
555 | brvcc->encaps = (enum br2684_encaps) be.encaps; |
556 | brvcc->old_push = atmvcc->push; |
557 | barrier(); |
558 | atmvcc->push = br2684_push; |
559 | skb_queue_head_init(©); |
560 | skb_migrate(&sk_atm(atmvcc)->sk_receive_queue, ©); |
561 | while ((skb = skb_dequeue(©)) != NULL) { |
562 | BRPRIV(skb->dev)->stats.rx_bytes -= skb->len; |
563 | BRPRIV(skb->dev)->stats.rx_packets--; |
564 | br2684_push(atmvcc, skb); |
565 | } |
566 | __module_get(THIS_MODULE); |
567 | return 0; |
568 | error: |
569 | write_unlock_irq(&devs_lock); |
570 | kfree(brvcc); |
571 | return err; |
572 | } |
573 | |
574 | static void br2684_setup(struct net_device *netdev) |
575 | { |
576 | struct br2684_dev *brdev = BRPRIV(netdev); |
577 | |
578 | ether_setup(netdev); |
579 | brdev->net_dev = netdev; |
580 | |
581 | #ifdef FASTER_VERSION |
582 | my_eth_header = netdev->hard_header; |
583 | netdev->hard_header = br2684_header; |
584 | my_eth_header_cache = netdev->hard_header_cache; |
585 | netdev->hard_header_cache = br2684_header_cache; |
586 | netdev->hard_header_len = sizeof(llc_oui_pid_pad) + ETH_HLEN; /* 10 + 14 */ |
587 | #endif |
588 | my_eth_mac_addr = netdev->set_mac_address; |
589 | netdev->set_mac_address = br2684_mac_addr; |
590 | netdev->hard_start_xmit = br2684_start_xmit; |
591 | netdev->get_stats = br2684_get_stats; |
592 | |
593 | INIT_LIST_HEAD(&brdev->brvccs); |
594 | } |
595 | |
596 | static int br2684_create(void __user *arg) |
597 | { |
598 | int err; |
599 | struct net_device *netdev; |
600 | struct br2684_dev *brdev; |
601 | struct atm_newif_br2684 ni; |
602 | |
603 | DPRINTK("br2684_create\n"); |
604 | |
605 | if (copy_from_user(&ni, arg, sizeof ni)) { |
606 | return -EFAULT; |
607 | } |
608 | if (ni.media != BR2684_MEDIA_ETHERNET || ni.mtu != 1500) { |
609 | return -EINVAL; |
610 | } |
611 | |
612 | netdev = alloc_netdev(sizeof(struct br2684_dev), |
613 | ni.ifname[0] ? ni.ifname : "nas%d", |
614 | br2684_setup); |
615 | if (!netdev) |
616 | return -ENOMEM; |
617 | |
618 | brdev = BRPRIV(netdev); |
619 | |
620 | DPRINTK("registered netdev %s\n", netdev->name); |
621 | /* open, stop, do_ioctl ? */ |
622 | err = register_netdev(netdev); |
623 | if (err < 0) { |
624 | printk(KERN_ERR "br2684_create: register_netdev failed\n"); |
625 | free_netdev(netdev); |
626 | return err; |
627 | } |
628 | |
629 | write_lock_irq(&devs_lock); |
630 | brdev->number = list_empty(&br2684_devs) ? 1 : |
631 | BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1; |
632 | list_add_tail(&brdev->br2684_devs, &br2684_devs); |
633 | write_unlock_irq(&devs_lock); |
634 | return 0; |
635 | } |
636 | |
637 | /* |
638 | * This handles ioctls actually performed on our vcc - we must return |
639 | * -ENOIOCTLCMD for any unrecognized ioctl |
640 | */ |
641 | static int br2684_ioctl(struct socket *sock, unsigned int cmd, |
642 | unsigned long arg) |
643 | { |
644 | struct atm_vcc *atmvcc = ATM_SD(sock); |
645 | void __user *argp = (void __user *)arg; |
646 | |
647 | int err; |
648 | switch(cmd) { |
649 | case ATM_SETBACKEND: |
650 | case ATM_NEWBACKENDIF: { |
651 | atm_backend_t b; |
652 | err = get_user(b, (atm_backend_t __user *) argp); |
653 | if (err) |
654 | return -EFAULT; |
655 | if (b != ATM_BACKEND_BR2684) |
656 | return -ENOIOCTLCMD; |
657 | if (!capable(CAP_NET_ADMIN)) |
658 | return -EPERM; |
659 | if (cmd == ATM_SETBACKEND) |
660 | return br2684_regvcc(atmvcc, argp); |
661 | else |
662 | return br2684_create(argp); |
663 | } |
664 | #ifdef CONFIG_ATM_BR2684_IPFILTER |
665 | case BR2684_SETFILT: |
666 | if (atmvcc->push != br2684_push) |
667 | return -ENOIOCTLCMD; |
668 | if (!capable(CAP_NET_ADMIN)) |
669 | return -EPERM; |
670 | err = br2684_setfilt(atmvcc, argp); |
671 | return err; |
672 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ |
673 | } |
674 | return -ENOIOCTLCMD; |
675 | } |
676 | |
677 | static struct atm_ioctl br2684_ioctl_ops = { |
678 | .owner = THIS_MODULE, |
679 | .ioctl = br2684_ioctl, |
680 | }; |
681 | |
682 | |
683 | #ifdef CONFIG_PROC_FS |
684 | static void *br2684_seq_start(struct seq_file *seq, loff_t *pos) |
685 | { |
686 | loff_t offs = 0; |
687 | struct br2684_dev *brd; |
688 | |
689 | read_lock(&devs_lock); |
690 | |
691 | list_for_each_entry(brd, &br2684_devs, br2684_devs) { |
692 | if (offs == *pos) |
693 | return brd; |
694 | ++offs; |
695 | } |
696 | return NULL; |
697 | } |
698 | |
699 | static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
700 | { |
701 | struct br2684_dev *brd = v; |
702 | |
703 | ++*pos; |
704 | |
705 | brd = list_entry(brd->br2684_devs.next, |
706 | struct br2684_dev, br2684_devs); |
707 | return (&brd->br2684_devs != &br2684_devs) ? brd : NULL; |
708 | } |
709 | |
710 | static void br2684_seq_stop(struct seq_file *seq, void *v) |
711 | { |
712 | read_unlock(&devs_lock); |
713 | } |
714 | |
715 | static int br2684_seq_show(struct seq_file *seq, void *v) |
716 | { |
717 | const struct br2684_dev *brdev = v; |
718 | const struct net_device *net_dev = brdev->net_dev; |
719 | const struct br2684_vcc *brvcc; |
720 | |
721 | seq_printf(seq, "dev %.16s: num=%d, mac=%02X:%02X:" |
722 | "%02X:%02X:%02X:%02X (%s)\n", net_dev->name, |
723 | brdev->number, |
724 | net_dev->dev_addr[0], |
725 | net_dev->dev_addr[1], |
726 | net_dev->dev_addr[2], |
727 | net_dev->dev_addr[3], |
728 | net_dev->dev_addr[4], |
729 | net_dev->dev_addr[5], |
730 | brdev->mac_was_set ? "set" : "auto"); |
731 | |
732 | list_for_each_entry(brvcc, &brdev->brvccs, brvccs) { |
733 | seq_printf(seq, " vcc %d.%d.%d: encaps=%s" |
734 | #ifndef FASTER_VERSION |
735 | ", failed copies %u/%u" |
736 | #endif /* FASTER_VERSION */ |
737 | "\n", brvcc->atmvcc->dev->number, |
738 | brvcc->atmvcc->vpi, brvcc->atmvcc->vci, |
739 | (brvcc->encaps == e_llc) ? "LLC" : "VC" |
740 | #ifndef FASTER_VERSION |
741 | , brvcc->copies_failed |
742 | , brvcc->copies_needed |
743 | #endif /* FASTER_VERSION */ |
744 | ); |
745 | #ifdef CONFIG_ATM_BR2684_IPFILTER |
746 | #define b1(var, byte) ((u8 *) &brvcc->filter.var)[byte] |
747 | #define bs(var) b1(var, 0), b1(var, 1), b1(var, 2), b1(var, 3) |
748 | if (brvcc->filter.netmask != 0) |
749 | seq_printf(seq, " filter=%d.%d.%d.%d/" |
750 | "%d.%d.%d.%d\n", |
751 | bs(prefix), bs(netmask)); |
752 | #undef bs |
753 | #undef b1 |
754 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ |
755 | } |
756 | return 0; |
757 | } |
758 | |
759 | static struct seq_operations br2684_seq_ops = { |
760 | .start = br2684_seq_start, |
761 | .next = br2684_seq_next, |
762 | .stop = br2684_seq_stop, |
763 | .show = br2684_seq_show, |
764 | }; |
765 | |
766 | static int br2684_proc_open(struct inode *inode, struct file *file) |
767 | { |
768 | return seq_open(file, &br2684_seq_ops); |
769 | } |
770 | |
771 | static struct file_operations br2684_proc_ops = { |
772 | .owner = THIS_MODULE, |
773 | .open = br2684_proc_open, |
774 | .read = seq_read, |
775 | .llseek = seq_lseek, |
776 | .release = seq_release, |
777 | }; |
778 | |
779 | extern struct proc_dir_entry *atm_proc_root; /* from proc.c */ |
780 | #endif |
781 | |
782 | static int __init br2684_init(void) |
783 | { |
784 | #ifdef CONFIG_PROC_FS |
785 | struct proc_dir_entry *p; |
786 | if ((p = create_proc_entry("br2684", 0, atm_proc_root)) == NULL) |
787 | return -ENOMEM; |
788 | p->proc_fops = &br2684_proc_ops; |
789 | #endif |
790 | register_atm_ioctl(&br2684_ioctl_ops); |
791 | return 0; |
792 | } |
793 | |
794 | static void __exit br2684_exit(void) |
795 | { |
796 | struct net_device *net_dev; |
797 | struct br2684_dev *brdev; |
798 | struct br2684_vcc *brvcc; |
799 | deregister_atm_ioctl(&br2684_ioctl_ops); |
800 | |
801 | #ifdef CONFIG_PROC_FS |
802 | remove_proc_entry("br2684", atm_proc_root); |
803 | #endif |
804 | |
805 | while (!list_empty(&br2684_devs)) { |
806 | net_dev = list_entry_brdev(br2684_devs.next); |
807 | brdev = BRPRIV(net_dev); |
808 | while (!list_empty(&brdev->brvccs)) { |
809 | brvcc = list_entry_brvcc(brdev->brvccs.next); |
810 | br2684_close_vcc(brvcc); |
811 | } |
812 | |
813 | list_del(&brdev->br2684_devs); |
814 | unregister_netdev(net_dev); |
815 | free_netdev(net_dev); |
816 | } |
817 | } |
818 | |
819 | module_init(br2684_init); |
820 | module_exit(br2684_exit); |
821 | |
822 | MODULE_AUTHOR("Marcell GAL"); |
823 | MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5"); |
824 | MODULE_LICENSE("GPL"); |