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Commit | Line | Data |
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1da177e4 | 1 | /* |
097b19a9 EK |
2 | Ethernet netdevice using ATM AAL5 as underlying carrier |
3 | (RFC1483 obsoleted by RFC2684) for Linux | |
4 | Authors: Marcell GAL, 2000, XDSL Ltd, Hungary | |
5 | Eric Kinzie, 2006-2007, US Naval Research Laboratory | |
1da177e4 LT |
6 | */ |
7 | ||
8 | #include <linux/module.h> | |
1da177e4 LT |
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> | |
4fc268d2 | 21 | #include <linux/capability.h> |
1da177e4 LT |
22 | #include <linux/seq_file.h> |
23 | ||
24 | #include <linux/atmbr2684.h> | |
25 | ||
26 | #include "common.h" | |
1da177e4 | 27 | |
1da177e4 LT |
28 | #ifdef SKB_DEBUG |
29 | static void skb_debug(const struct sk_buff *skb) | |
30 | { | |
31 | #define NUM2PRINT 50 | |
32 | char buf[NUM2PRINT * 3 + 1]; /* 3 chars per byte */ | |
33 | int i = 0; | |
34 | for (i = 0; i < skb->len && i < NUM2PRINT; i++) { | |
35 | sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]); | |
36 | } | |
37 | printk(KERN_DEBUG "br2684: skb: %s\n", buf); | |
38 | } | |
39 | #else | |
40 | #define skb_debug(skb) do {} while (0) | |
41 | #endif | |
42 | ||
097b19a9 EK |
43 | #define BR2684_ETHERTYPE_LEN 2 |
44 | #define BR2684_PAD_LEN 2 | |
45 | ||
46 | #define LLC 0xaa, 0xaa, 0x03 | |
47 | #define SNAP_BRIDGED 0x00, 0x80, 0xc2 | |
48 | #define SNAP_ROUTED 0x00, 0x00, 0x00 | |
49 | #define PID_ETHERNET 0x00, 0x07 | |
50 | #define ETHERTYPE_IPV4 0x08, 0x00 | |
51 | #define ETHERTYPE_IPV6 0x86, 0xdd | |
52 | #define PAD_BRIDGED 0x00, 0x00 | |
53 | ||
54 | static unsigned char ethertype_ipv4[] = | |
55 | { ETHERTYPE_IPV4 }; | |
56 | static unsigned char ethertype_ipv6[] = | |
57 | { ETHERTYPE_IPV6 }; | |
1da177e4 | 58 | static unsigned char llc_oui_pid_pad[] = |
097b19a9 EK |
59 | { LLC, SNAP_BRIDGED, PID_ETHERNET, PAD_BRIDGED }; |
60 | static unsigned char llc_oui_ipv4[] = | |
61 | { LLC, SNAP_ROUTED, ETHERTYPE_IPV4 }; | |
62 | static unsigned char llc_oui_ipv6[] = | |
63 | { LLC, SNAP_ROUTED, ETHERTYPE_IPV6 }; | |
1da177e4 LT |
64 | |
65 | enum br2684_encaps { | |
66 | e_vc = BR2684_ENCAPS_VC, | |
67 | e_llc = BR2684_ENCAPS_LLC, | |
68 | }; | |
69 | ||
70 | struct br2684_vcc { | |
71 | struct atm_vcc *atmvcc; | |
72 | struct net_device *device; | |
73 | /* keep old push,pop functions for chaining */ | |
74 | void (*old_push)(struct atm_vcc *vcc,struct sk_buff *skb); | |
75 | /* void (*old_pop)(struct atm_vcc *vcc,struct sk_buff *skb); */ | |
76 | enum br2684_encaps encaps; | |
77 | struct list_head brvccs; | |
78 | #ifdef CONFIG_ATM_BR2684_IPFILTER | |
79 | struct br2684_filter filter; | |
80 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ | |
1da177e4 | 81 | unsigned copies_needed, copies_failed; |
1da177e4 LT |
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; | |
097b19a9 | 91 | enum br2684_payload payload; |
1da177e4 LT |
92 | }; |
93 | ||
94 | /* | |
95 | * This lock should be held for writing any time the list of devices or | |
96 | * their attached vcc's could be altered. It should be held for reading | |
97 | * any time these are being queried. Note that we sometimes need to | |
98 | * do read-locking under interrupt context, so write locking must block | |
99 | * the current CPU's interrupts | |
100 | */ | |
101 | static DEFINE_RWLOCK(devs_lock); | |
102 | ||
103 | static LIST_HEAD(br2684_devs); | |
104 | ||
105 | static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev) | |
106 | { | |
107 | return (struct br2684_dev *) net_dev->priv; | |
108 | } | |
109 | ||
110 | static inline struct net_device *list_entry_brdev(const struct list_head *le) | |
111 | { | |
112 | return list_entry(le, struct br2684_dev, br2684_devs)->net_dev; | |
113 | } | |
114 | ||
115 | static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc) | |
116 | { | |
117 | return (struct br2684_vcc *) (atmvcc->user_back); | |
118 | } | |
119 | ||
120 | static inline struct br2684_vcc *list_entry_brvcc(const struct list_head *le) | |
121 | { | |
122 | return list_entry(le, struct br2684_vcc, brvccs); | |
123 | } | |
124 | ||
125 | /* Caller should hold read_lock(&devs_lock) */ | |
126 | static struct net_device *br2684_find_dev(const struct br2684_if_spec *s) | |
127 | { | |
128 | struct list_head *lh; | |
129 | struct net_device *net_dev; | |
130 | switch (s->method) { | |
131 | case BR2684_FIND_BYNUM: | |
132 | list_for_each(lh, &br2684_devs) { | |
133 | net_dev = list_entry_brdev(lh); | |
134 | if (BRPRIV(net_dev)->number == s->spec.devnum) | |
135 | return net_dev; | |
136 | } | |
137 | break; | |
138 | case BR2684_FIND_BYIFNAME: | |
139 | list_for_each(lh, &br2684_devs) { | |
140 | net_dev = list_entry_brdev(lh); | |
141 | if (!strncmp(net_dev->name, s->spec.ifname, IFNAMSIZ)) | |
142 | return net_dev; | |
143 | } | |
144 | break; | |
145 | } | |
146 | return NULL; | |
147 | } | |
148 | ||
149 | /* | |
150 | * Send a packet out a particular vcc. Not to useful right now, but paves | |
151 | * the way for multiple vcc's per itf. Returns true if we can send, | |
152 | * otherwise false | |
153 | */ | |
154 | static int br2684_xmit_vcc(struct sk_buff *skb, struct br2684_dev *brdev, | |
155 | struct br2684_vcc *brvcc) | |
156 | { | |
157 | struct atm_vcc *atmvcc; | |
1da177e4 | 158 | int minheadroom = (brvcc->encaps == e_llc) ? 10 : 2; |
097b19a9 | 159 | |
1da177e4 LT |
160 | if (skb_headroom(skb) < minheadroom) { |
161 | struct sk_buff *skb2 = skb_realloc_headroom(skb, minheadroom); | |
162 | brvcc->copies_needed++; | |
163 | dev_kfree_skb(skb); | |
164 | if (skb2 == NULL) { | |
165 | brvcc->copies_failed++; | |
166 | return 0; | |
167 | } | |
168 | skb = skb2; | |
169 | } | |
097b19a9 EK |
170 | |
171 | if (brvcc->encaps == e_llc) { | |
172 | if (brdev->payload == p_bridged) { | |
173 | skb_push(skb, sizeof(llc_oui_pid_pad)); | |
174 | skb_copy_to_linear_data(skb, llc_oui_pid_pad, sizeof(llc_oui_pid_pad)); | |
175 | } else if (brdev->payload == p_routed) { | |
176 | unsigned short prot = ntohs(skb->protocol); | |
177 | ||
178 | skb_push(skb, sizeof(llc_oui_ipv4)); | |
179 | switch (prot) { | |
180 | case ETH_P_IP: | |
181 | skb_copy_to_linear_data(skb, llc_oui_ipv4, sizeof(llc_oui_ipv4)); | |
182 | break; | |
183 | case ETH_P_IPV6: | |
184 | skb_copy_to_linear_data(skb, llc_oui_ipv6, sizeof(llc_oui_ipv6)); | |
185 | break; | |
186 | default: | |
187 | dev_kfree_skb(skb); | |
188 | return 0; | |
189 | } | |
190 | } | |
191 | } else { | |
192 | skb_push(skb, 2); | |
193 | if (brdev->payload == p_bridged) | |
194 | memset(skb->data, 0, 2); | |
195 | } | |
1da177e4 LT |
196 | skb_debug(skb); |
197 | ||
198 | ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc; | |
52240062 | 199 | pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev); |
1da177e4 | 200 | if (!atm_may_send(atmvcc, skb->truesize)) { |
f7d57453 | 201 | /* we free this here for now, because we cannot know in a higher |
1da177e4 LT |
202 | layer whether the skb point it supplied wasn't freed yet. |
203 | now, it always is. | |
204 | */ | |
205 | dev_kfree_skb(skb); | |
206 | return 0; | |
207 | } | |
208 | atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc); | |
209 | ATM_SKB(skb)->atm_options = atmvcc->atm_options; | |
210 | brdev->stats.tx_packets++; | |
211 | brdev->stats.tx_bytes += skb->len; | |
212 | atmvcc->send(atmvcc, skb); | |
213 | return 1; | |
214 | } | |
215 | ||
216 | static inline struct br2684_vcc *pick_outgoing_vcc(struct sk_buff *skb, | |
217 | struct br2684_dev *brdev) | |
218 | { | |
219 | return list_empty(&brdev->brvccs) ? NULL : | |
220 | list_entry_brvcc(brdev->brvccs.next); /* 1 vcc/dev right now */ | |
221 | } | |
222 | ||
223 | static int br2684_start_xmit(struct sk_buff *skb, struct net_device *dev) | |
224 | { | |
225 | struct br2684_dev *brdev = BRPRIV(dev); | |
226 | struct br2684_vcc *brvcc; | |
227 | ||
52240062 | 228 | pr_debug("br2684_start_xmit, skb->dst=%p\n", skb->dst); |
1da177e4 LT |
229 | read_lock(&devs_lock); |
230 | brvcc = pick_outgoing_vcc(skb, brdev); | |
231 | if (brvcc == NULL) { | |
52240062 | 232 | pr_debug("no vcc attached to dev %s\n", dev->name); |
1da177e4 LT |
233 | brdev->stats.tx_errors++; |
234 | brdev->stats.tx_carrier_errors++; | |
235 | /* netif_stop_queue(dev); */ | |
236 | dev_kfree_skb(skb); | |
237 | read_unlock(&devs_lock); | |
4f55cd10 | 238 | return 0; |
1da177e4 LT |
239 | } |
240 | if (!br2684_xmit_vcc(skb, brdev, brvcc)) { | |
241 | /* | |
242 | * We should probably use netif_*_queue() here, but that | |
243 | * involves added complication. We need to walk before | |
244 | * we can run | |
245 | */ | |
246 | /* don't free here! this pointer might be no longer valid! | |
247 | dev_kfree_skb(skb); | |
248 | */ | |
249 | brdev->stats.tx_errors++; | |
250 | brdev->stats.tx_fifo_errors++; | |
251 | } | |
252 | read_unlock(&devs_lock); | |
253 | return 0; | |
254 | } | |
255 | ||
256 | static struct net_device_stats *br2684_get_stats(struct net_device *dev) | |
257 | { | |
52240062 | 258 | pr_debug("br2684_get_stats\n"); |
1da177e4 LT |
259 | return &BRPRIV(dev)->stats; |
260 | } | |
261 | ||
1da177e4 LT |
262 | |
263 | /* | |
264 | * We remember when the MAC gets set, so we don't override it later with | |
265 | * the ESI of the ATM card of the first VC | |
266 | */ | |
267 | static int (*my_eth_mac_addr)(struct net_device *, void *); | |
268 | static int br2684_mac_addr(struct net_device *dev, void *p) | |
269 | { | |
270 | int err = my_eth_mac_addr(dev, p); | |
271 | if (!err) | |
272 | BRPRIV(dev)->mac_was_set = 1; | |
273 | return err; | |
274 | } | |
275 | ||
276 | #ifdef CONFIG_ATM_BR2684_IPFILTER | |
277 | /* this IOCTL is experimental. */ | |
278 | static int br2684_setfilt(struct atm_vcc *atmvcc, void __user *arg) | |
279 | { | |
280 | struct br2684_vcc *brvcc; | |
281 | struct br2684_filter_set fs; | |
282 | ||
283 | if (copy_from_user(&fs, arg, sizeof fs)) | |
284 | return -EFAULT; | |
285 | if (fs.ifspec.method != BR2684_FIND_BYNOTHING) { | |
286 | /* | |
287 | * This is really a per-vcc thing, but we can also search | |
288 | * by device | |
289 | */ | |
290 | struct br2684_dev *brdev; | |
291 | read_lock(&devs_lock); | |
292 | brdev = BRPRIV(br2684_find_dev(&fs.ifspec)); | |
293 | if (brdev == NULL || list_empty(&brdev->brvccs) || | |
294 | brdev->brvccs.next != brdev->brvccs.prev) /* >1 VCC */ | |
295 | brvcc = NULL; | |
296 | else | |
297 | brvcc = list_entry_brvcc(brdev->brvccs.next); | |
298 | read_unlock(&devs_lock); | |
299 | if (brvcc == NULL) | |
300 | return -ESRCH; | |
301 | } else | |
302 | brvcc = BR2684_VCC(atmvcc); | |
303 | memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter)); | |
304 | return 0; | |
305 | } | |
306 | ||
307 | /* Returns 1 if packet should be dropped */ | |
308 | static inline int | |
30d492da | 309 | packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb) |
1da177e4 LT |
310 | { |
311 | if (brvcc->filter.netmask == 0) | |
312 | return 0; /* no filter in place */ | |
acde4855 | 313 | if (type == htons(ETH_P_IP) && |
1da177e4 LT |
314 | (((struct iphdr *) (skb->data))->daddr & brvcc->filter. |
315 | netmask) == brvcc->filter.prefix) | |
316 | return 0; | |
acde4855 | 317 | if (type == htons(ETH_P_ARP)) |
1da177e4 LT |
318 | return 0; |
319 | /* TODO: we should probably filter ARPs too.. don't want to have | |
320 | * them returning values that don't make sense, or is that ok? | |
321 | */ | |
322 | return 1; /* drop */ | |
323 | } | |
324 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ | |
325 | ||
326 | static void br2684_close_vcc(struct br2684_vcc *brvcc) | |
327 | { | |
52240062 | 328 | pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device); |
1da177e4 LT |
329 | write_lock_irq(&devs_lock); |
330 | list_del(&brvcc->brvccs); | |
331 | write_unlock_irq(&devs_lock); | |
332 | brvcc->atmvcc->user_back = NULL; /* what about vcc->recvq ??? */ | |
333 | brvcc->old_push(brvcc->atmvcc, NULL); /* pass on the bad news */ | |
334 | kfree(brvcc); | |
335 | module_put(THIS_MODULE); | |
336 | } | |
337 | ||
338 | /* when AAL5 PDU comes in: */ | |
339 | static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb) | |
340 | { | |
341 | struct br2684_vcc *brvcc = BR2684_VCC(atmvcc); | |
342 | struct net_device *net_dev = brvcc->device; | |
343 | struct br2684_dev *brdev = BRPRIV(net_dev); | |
1da177e4 | 344 | |
52240062 | 345 | pr_debug("br2684_push\n"); |
1da177e4 LT |
346 | |
347 | if (unlikely(skb == NULL)) { | |
348 | /* skb==NULL means VCC is being destroyed */ | |
349 | br2684_close_vcc(brvcc); | |
350 | if (list_empty(&brdev->brvccs)) { | |
351 | read_lock(&devs_lock); | |
352 | list_del(&brdev->br2684_devs); | |
353 | read_unlock(&devs_lock); | |
354 | unregister_netdev(net_dev); | |
355 | free_netdev(net_dev); | |
356 | } | |
357 | return; | |
358 | } | |
359 | ||
360 | skb_debug(skb); | |
361 | atm_return(atmvcc, skb->truesize); | |
52240062 | 362 | pr_debug("skb from brdev %p\n", brdev); |
1da177e4 | 363 | if (brvcc->encaps == e_llc) { |
097b19a9 EK |
364 | |
365 | if (skb->len > 7 && skb->data[7] == 0x01) | |
366 | __skb_trim(skb, skb->len - 4); | |
367 | ||
368 | /* accept packets that have "ipv[46]" in the snap header */ | |
369 | if ((skb->len >= (sizeof(llc_oui_ipv4))) | |
370 | && (memcmp(skb->data, llc_oui_ipv4, sizeof(llc_oui_ipv4) - BR2684_ETHERTYPE_LEN) == 0)) { | |
371 | if (memcmp(skb->data + 6, ethertype_ipv6, sizeof(ethertype_ipv6)) == 0) | |
372 | skb->protocol = __constant_htons(ETH_P_IPV6); | |
373 | else if (memcmp(skb->data + 6, ethertype_ipv4, sizeof(ethertype_ipv4)) == 0) | |
374 | skb->protocol = __constant_htons(ETH_P_IP); | |
375 | else { | |
376 | brdev->stats.rx_errors++; | |
377 | dev_kfree_skb(skb); | |
378 | return; | |
379 | } | |
380 | skb_pull(skb, sizeof(llc_oui_ipv4)); | |
381 | skb_reset_network_header(skb); | |
382 | skb->pkt_type = PACKET_HOST; | |
383 | ||
1da177e4 LT |
384 | /* let us waste some time for checking the encapsulation. |
385 | Note, that only 7 char is checked so frames with a valid FCS | |
386 | are also accepted (but FCS is not checked of course) */ | |
097b19a9 EK |
387 | } else if ((skb->len >= sizeof(llc_oui_pid_pad)) && |
388 | (memcmp(skb->data, llc_oui_pid_pad, 7) == 0)) { | |
389 | skb_pull(skb, sizeof(llc_oui_pid_pad)); | |
390 | skb->protocol = eth_type_trans(skb, net_dev); | |
391 | } else { | |
1da177e4 LT |
392 | brdev->stats.rx_errors++; |
393 | dev_kfree_skb(skb); | |
394 | return; | |
395 | } | |
396 | ||
1da177e4 | 397 | } else { |
1da177e4 LT |
398 | /* first 2 chars should be 0 */ |
399 | if (*((u16 *) (skb->data)) != 0) { | |
400 | brdev->stats.rx_errors++; | |
401 | dev_kfree_skb(skb); | |
402 | return; | |
403 | } | |
097b19a9 EK |
404 | skb_pull(skb, BR2684_PAD_LEN + ETH_HLEN); /* pad, dstmac, srcmac, ethtype */ |
405 | skb->protocol = eth_type_trans(skb, net_dev); | |
1da177e4 LT |
406 | } |
407 | ||
1da177e4 LT |
408 | #ifdef CONFIG_ATM_BR2684_IPFILTER |
409 | if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb))) { | |
410 | brdev->stats.rx_dropped++; | |
411 | dev_kfree_skb(skb); | |
412 | return; | |
413 | } | |
414 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ | |
415 | skb->dev = net_dev; | |
416 | ATM_SKB(skb)->vcc = atmvcc; /* needed ? */ | |
52240062 | 417 | pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol)); |
1da177e4 LT |
418 | skb_debug(skb); |
419 | if (unlikely(!(net_dev->flags & IFF_UP))) { | |
420 | /* sigh, interface is down */ | |
421 | brdev->stats.rx_dropped++; | |
422 | dev_kfree_skb(skb); | |
423 | return; | |
424 | } | |
425 | brdev->stats.rx_packets++; | |
426 | brdev->stats.rx_bytes += skb->len; | |
427 | memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); | |
428 | netif_rx(skb); | |
429 | } | |
430 | ||
431 | static int br2684_regvcc(struct atm_vcc *atmvcc, void __user *arg) | |
432 | { | |
433 | /* assign a vcc to a dev | |
434 | Note: we do not have explicit unassign, but look at _push() | |
435 | */ | |
436 | int err; | |
437 | struct br2684_vcc *brvcc; | |
1da177e4 | 438 | struct sk_buff *skb; |
c40a27f4 | 439 | struct sk_buff_head *rq; |
1da177e4 LT |
440 | struct br2684_dev *brdev; |
441 | struct net_device *net_dev; | |
442 | struct atm_backend_br2684 be; | |
c40a27f4 | 443 | unsigned long flags; |
1da177e4 LT |
444 | |
445 | if (copy_from_user(&be, arg, sizeof be)) | |
446 | return -EFAULT; | |
0da974f4 | 447 | brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL); |
1da177e4 LT |
448 | if (!brvcc) |
449 | return -ENOMEM; | |
1da177e4 LT |
450 | write_lock_irq(&devs_lock); |
451 | net_dev = br2684_find_dev(&be.ifspec); | |
452 | if (net_dev == NULL) { | |
453 | printk(KERN_ERR | |
454 | "br2684: tried to attach to non-existant device\n"); | |
455 | err = -ENXIO; | |
456 | goto error; | |
457 | } | |
458 | brdev = BRPRIV(net_dev); | |
459 | if (atmvcc->push == NULL) { | |
460 | err = -EBADFD; | |
461 | goto error; | |
462 | } | |
463 | if (!list_empty(&brdev->brvccs)) { | |
464 | /* Only 1 VCC/dev right now */ | |
465 | err = -EEXIST; | |
466 | goto error; | |
467 | } | |
468 | if (be.fcs_in != BR2684_FCSIN_NO || be.fcs_out != BR2684_FCSOUT_NO || | |
469 | be.fcs_auto || be.has_vpiid || be.send_padding || (be.encaps != | |
470 | BR2684_ENCAPS_VC && be.encaps != BR2684_ENCAPS_LLC) || | |
471 | be.min_size != 0) { | |
472 | err = -EINVAL; | |
473 | goto error; | |
474 | } | |
52240062 | 475 | pr_debug("br2684_regvcc vcc=%p, encaps=%d, brvcc=%p\n", atmvcc, be.encaps, |
1da177e4 LT |
476 | brvcc); |
477 | if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) { | |
478 | unsigned char *esi = atmvcc->dev->esi; | |
479 | if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5]) | |
480 | memcpy(net_dev->dev_addr, esi, net_dev->addr_len); | |
481 | else | |
482 | net_dev->dev_addr[2] = 1; | |
483 | } | |
484 | list_add(&brvcc->brvccs, &brdev->brvccs); | |
485 | write_unlock_irq(&devs_lock); | |
486 | brvcc->device = net_dev; | |
487 | brvcc->atmvcc = atmvcc; | |
488 | atmvcc->user_back = brvcc; | |
489 | brvcc->encaps = (enum br2684_encaps) be.encaps; | |
490 | brvcc->old_push = atmvcc->push; | |
491 | barrier(); | |
492 | atmvcc->push = br2684_push; | |
c40a27f4 DM |
493 | |
494 | rq = &sk_atm(atmvcc)->sk_receive_queue; | |
495 | ||
496 | spin_lock_irqsave(&rq->lock, flags); | |
497 | if (skb_queue_empty(rq)) { | |
498 | skb = NULL; | |
499 | } else { | |
500 | /* NULL terminate the list. */ | |
501 | rq->prev->next = NULL; | |
502 | skb = rq->next; | |
503 | } | |
504 | rq->prev = rq->next = (struct sk_buff *)rq; | |
505 | rq->qlen = 0; | |
506 | spin_unlock_irqrestore(&rq->lock, flags); | |
507 | ||
508 | while (skb) { | |
509 | struct sk_buff *next = skb->next; | |
510 | ||
511 | skb->next = skb->prev = NULL; | |
1da177e4 LT |
512 | BRPRIV(skb->dev)->stats.rx_bytes -= skb->len; |
513 | BRPRIV(skb->dev)->stats.rx_packets--; | |
514 | br2684_push(atmvcc, skb); | |
c40a27f4 DM |
515 | |
516 | skb = next; | |
1da177e4 LT |
517 | } |
518 | __module_get(THIS_MODULE); | |
519 | return 0; | |
520 | error: | |
521 | write_unlock_irq(&devs_lock); | |
522 | kfree(brvcc); | |
523 | return err; | |
524 | } | |
525 | ||
526 | static void br2684_setup(struct net_device *netdev) | |
527 | { | |
528 | struct br2684_dev *brdev = BRPRIV(netdev); | |
529 | ||
530 | ether_setup(netdev); | |
531 | brdev->net_dev = netdev; | |
532 | ||
1da177e4 LT |
533 | my_eth_mac_addr = netdev->set_mac_address; |
534 | netdev->set_mac_address = br2684_mac_addr; | |
535 | netdev->hard_start_xmit = br2684_start_xmit; | |
536 | netdev->get_stats = br2684_get_stats; | |
537 | ||
538 | INIT_LIST_HEAD(&brdev->brvccs); | |
539 | } | |
540 | ||
097b19a9 EK |
541 | static void br2684_setup_routed(struct net_device *netdev) |
542 | { | |
543 | struct br2684_dev *brdev = BRPRIV(netdev); | |
544 | brdev->net_dev = netdev; | |
545 | ||
546 | netdev->hard_header_len = 0; | |
547 | my_eth_mac_addr = netdev->set_mac_address; | |
548 | netdev->set_mac_address = br2684_mac_addr; | |
549 | netdev->hard_start_xmit = br2684_start_xmit; | |
550 | netdev->get_stats = br2684_get_stats; | |
551 | netdev->addr_len = 0; | |
552 | netdev->mtu = 1500; | |
553 | netdev->type = ARPHRD_PPP; | |
554 | netdev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; | |
555 | netdev->tx_queue_len = 100; | |
556 | INIT_LIST_HEAD(&brdev->brvccs); | |
557 | } | |
558 | ||
1da177e4 LT |
559 | static int br2684_create(void __user *arg) |
560 | { | |
561 | int err; | |
562 | struct net_device *netdev; | |
563 | struct br2684_dev *brdev; | |
564 | struct atm_newif_br2684 ni; | |
097b19a9 | 565 | enum br2684_payload payload; |
1da177e4 | 566 | |
52240062 | 567 | pr_debug("br2684_create\n"); |
1da177e4 LT |
568 | |
569 | if (copy_from_user(&ni, arg, sizeof ni)) { | |
570 | return -EFAULT; | |
571 | } | |
097b19a9 EK |
572 | |
573 | if (ni.media & BR2684_FLAG_ROUTED) | |
574 | payload = p_routed; | |
575 | else | |
576 | payload = p_bridged; | |
577 | ni.media &= 0xffff; /* strip flags */ | |
578 | ||
1da177e4 LT |
579 | if (ni.media != BR2684_MEDIA_ETHERNET || ni.mtu != 1500) { |
580 | return -EINVAL; | |
581 | } | |
582 | ||
583 | netdev = alloc_netdev(sizeof(struct br2684_dev), | |
584 | ni.ifname[0] ? ni.ifname : "nas%d", | |
097b19a9 EK |
585 | (payload == p_routed) ? |
586 | br2684_setup_routed : br2684_setup); | |
1da177e4 LT |
587 | if (!netdev) |
588 | return -ENOMEM; | |
589 | ||
590 | brdev = BRPRIV(netdev); | |
591 | ||
52240062 | 592 | pr_debug("registered netdev %s\n", netdev->name); |
1da177e4 LT |
593 | /* open, stop, do_ioctl ? */ |
594 | err = register_netdev(netdev); | |
595 | if (err < 0) { | |
596 | printk(KERN_ERR "br2684_create: register_netdev failed\n"); | |
597 | free_netdev(netdev); | |
598 | return err; | |
599 | } | |
600 | ||
601 | write_lock_irq(&devs_lock); | |
097b19a9 | 602 | brdev->payload = payload; |
1da177e4 LT |
603 | brdev->number = list_empty(&br2684_devs) ? 1 : |
604 | BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1; | |
605 | list_add_tail(&brdev->br2684_devs, &br2684_devs); | |
606 | write_unlock_irq(&devs_lock); | |
607 | return 0; | |
608 | } | |
609 | ||
610 | /* | |
611 | * This handles ioctls actually performed on our vcc - we must return | |
612 | * -ENOIOCTLCMD for any unrecognized ioctl | |
613 | */ | |
614 | static int br2684_ioctl(struct socket *sock, unsigned int cmd, | |
615 | unsigned long arg) | |
616 | { | |
617 | struct atm_vcc *atmvcc = ATM_SD(sock); | |
618 | void __user *argp = (void __user *)arg; | |
619 | ||
620 | int err; | |
621 | switch(cmd) { | |
622 | case ATM_SETBACKEND: | |
623 | case ATM_NEWBACKENDIF: { | |
624 | atm_backend_t b; | |
625 | err = get_user(b, (atm_backend_t __user *) argp); | |
626 | if (err) | |
627 | return -EFAULT; | |
628 | if (b != ATM_BACKEND_BR2684) | |
629 | return -ENOIOCTLCMD; | |
630 | if (!capable(CAP_NET_ADMIN)) | |
631 | return -EPERM; | |
632 | if (cmd == ATM_SETBACKEND) | |
633 | return br2684_regvcc(atmvcc, argp); | |
634 | else | |
635 | return br2684_create(argp); | |
636 | } | |
637 | #ifdef CONFIG_ATM_BR2684_IPFILTER | |
638 | case BR2684_SETFILT: | |
639 | if (atmvcc->push != br2684_push) | |
640 | return -ENOIOCTLCMD; | |
641 | if (!capable(CAP_NET_ADMIN)) | |
642 | return -EPERM; | |
643 | err = br2684_setfilt(atmvcc, argp); | |
644 | return err; | |
645 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ | |
646 | } | |
647 | return -ENOIOCTLCMD; | |
648 | } | |
649 | ||
650 | static struct atm_ioctl br2684_ioctl_ops = { | |
651 | .owner = THIS_MODULE, | |
652 | .ioctl = br2684_ioctl, | |
653 | }; | |
654 | ||
655 | ||
656 | #ifdef CONFIG_PROC_FS | |
657 | static void *br2684_seq_start(struct seq_file *seq, loff_t *pos) | |
658 | { | |
1da177e4 | 659 | read_lock(&devs_lock); |
9af97186 | 660 | return seq_list_start(&br2684_devs, *pos); |
1da177e4 LT |
661 | } |
662 | ||
663 | static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
664 | { | |
9af97186 | 665 | return seq_list_next(v, &br2684_devs, pos); |
1da177e4 LT |
666 | } |
667 | ||
668 | static void br2684_seq_stop(struct seq_file *seq, void *v) | |
669 | { | |
670 | read_unlock(&devs_lock); | |
671 | } | |
672 | ||
673 | static int br2684_seq_show(struct seq_file *seq, void *v) | |
674 | { | |
9af97186 PE |
675 | const struct br2684_dev *brdev = list_entry(v, struct br2684_dev, |
676 | br2684_devs); | |
1da177e4 LT |
677 | const struct net_device *net_dev = brdev->net_dev; |
678 | const struct br2684_vcc *brvcc; | |
0795af57 | 679 | DECLARE_MAC_BUF(mac); |
1da177e4 | 680 | |
0795af57 JP |
681 | seq_printf(seq, "dev %.16s: num=%d, mac=%s (%s)\n", |
682 | net_dev->name, | |
683 | brdev->number, | |
684 | print_mac(mac, net_dev->dev_addr), | |
685 | brdev->mac_was_set ? "set" : "auto"); | |
1da177e4 LT |
686 | |
687 | list_for_each_entry(brvcc, &brdev->brvccs, brvccs) { | |
097b19a9 EK |
688 | seq_printf(seq, " vcc %d.%d.%d: encaps=%s payload=%s" |
689 | ", failed copies %u/%u" | |
690 | "\n", brvcc->atmvcc->dev->number, | |
691 | brvcc->atmvcc->vpi, brvcc->atmvcc->vci, | |
692 | (brvcc->encaps == e_llc) ? "LLC" : "VC", | |
693 | (brdev->payload == p_bridged) ? "bridged" : "routed", | |
694 | brvcc->copies_failed, | |
695 | brvcc->copies_needed); | |
1da177e4 LT |
696 | #ifdef CONFIG_ATM_BR2684_IPFILTER |
697 | #define b1(var, byte) ((u8 *) &brvcc->filter.var)[byte] | |
698 | #define bs(var) b1(var, 0), b1(var, 1), b1(var, 2), b1(var, 3) | |
699 | if (brvcc->filter.netmask != 0) | |
700 | seq_printf(seq, " filter=%d.%d.%d.%d/" | |
701 | "%d.%d.%d.%d\n", | |
702 | bs(prefix), bs(netmask)); | |
703 | #undef bs | |
704 | #undef b1 | |
705 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ | |
706 | } | |
707 | return 0; | |
708 | } | |
709 | ||
56b3d975 | 710 | static const struct seq_operations br2684_seq_ops = { |
1da177e4 LT |
711 | .start = br2684_seq_start, |
712 | .next = br2684_seq_next, | |
713 | .stop = br2684_seq_stop, | |
714 | .show = br2684_seq_show, | |
715 | }; | |
716 | ||
717 | static int br2684_proc_open(struct inode *inode, struct file *file) | |
718 | { | |
719 | return seq_open(file, &br2684_seq_ops); | |
720 | } | |
721 | ||
9a32144e | 722 | static const struct file_operations br2684_proc_ops = { |
1da177e4 LT |
723 | .owner = THIS_MODULE, |
724 | .open = br2684_proc_open, | |
725 | .read = seq_read, | |
726 | .llseek = seq_lseek, | |
727 | .release = seq_release, | |
728 | }; | |
729 | ||
730 | extern struct proc_dir_entry *atm_proc_root; /* from proc.c */ | |
731 | #endif | |
732 | ||
733 | static int __init br2684_init(void) | |
734 | { | |
735 | #ifdef CONFIG_PROC_FS | |
736 | struct proc_dir_entry *p; | |
737 | if ((p = create_proc_entry("br2684", 0, atm_proc_root)) == NULL) | |
738 | return -ENOMEM; | |
739 | p->proc_fops = &br2684_proc_ops; | |
740 | #endif | |
741 | register_atm_ioctl(&br2684_ioctl_ops); | |
742 | return 0; | |
743 | } | |
744 | ||
745 | static void __exit br2684_exit(void) | |
746 | { | |
747 | struct net_device *net_dev; | |
748 | struct br2684_dev *brdev; | |
749 | struct br2684_vcc *brvcc; | |
750 | deregister_atm_ioctl(&br2684_ioctl_ops); | |
751 | ||
752 | #ifdef CONFIG_PROC_FS | |
753 | remove_proc_entry("br2684", atm_proc_root); | |
754 | #endif | |
755 | ||
756 | while (!list_empty(&br2684_devs)) { | |
757 | net_dev = list_entry_brdev(br2684_devs.next); | |
758 | brdev = BRPRIV(net_dev); | |
759 | while (!list_empty(&brdev->brvccs)) { | |
760 | brvcc = list_entry_brvcc(brdev->brvccs.next); | |
761 | br2684_close_vcc(brvcc); | |
762 | } | |
763 | ||
764 | list_del(&brdev->br2684_devs); | |
765 | unregister_netdev(net_dev); | |
766 | free_netdev(net_dev); | |
767 | } | |
768 | } | |
769 | ||
770 | module_init(br2684_init); | |
771 | module_exit(br2684_exit); | |
772 | ||
773 | MODULE_AUTHOR("Marcell GAL"); | |
774 | MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5"); | |
775 | MODULE_LICENSE("GPL"); |