Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
fb64c735 CW |
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 | */ | |
1da177e4 | 8 | |
99824461 JP |
9 | #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ |
10 | ||
1da177e4 | 11 | #include <linux/module.h> |
1da177e4 LT |
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> | |
641d729e | 20 | #include <linux/uaccess.h> |
5a0e3ad6 | 21 | #include <linux/slab.h> |
1da177e4 LT |
22 | #include <net/arp.h> |
23 | #include <linux/atm.h> | |
24 | #include <linux/atmdev.h> | |
4fc268d2 | 25 | #include <linux/capability.h> |
1da177e4 LT |
26 | #include <linux/seq_file.h> |
27 | ||
28 | #include <linux/atmbr2684.h> | |
29 | ||
30 | #include "common.h" | |
1da177e4 | 31 | |
1da177e4 LT |
32 | static void skb_debug(const struct sk_buff *skb) |
33 | { | |
641d729e | 34 | #ifdef SKB_DEBUG |
1da177e4 | 35 | #define NUM2PRINT 50 |
641d729e JP |
36 | print_hex_dump(KERN_DEBUG, "br2684: skb: ", DUMP_OFFSET, |
37 | 16, 1, skb->data, min(NUM2PRINT, skb->len), true); | |
1da177e4 | 38 | #endif |
641d729e | 39 | } |
1da177e4 | 40 | |
097b19a9 EK |
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 | ||
61c33e01 MBJ |
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[] = | |
fb64c735 | 55 | { LLC, SNAP_BRIDGED, PID_ETHERNET, PAD_BRIDGED }; |
befc93fe | 56 | static const unsigned char pad[] = { PAD_BRIDGED }; |
61c33e01 MBJ |
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 }; | |
1da177e4 LT |
59 | |
60 | enum br2684_encaps { | |
fb64c735 | 61 | e_vc = BR2684_ENCAPS_VC, |
1da177e4 LT |
62 | e_llc = BR2684_ENCAPS_LLC, |
63 | }; | |
64 | ||
65 | struct br2684_vcc { | |
fb64c735 | 66 | struct atm_vcc *atmvcc; |
1da177e4 | 67 | struct net_device *device; |
fb64c735 | 68 | /* keep old push, pop functions for chaining */ |
641d729e | 69 | void (*old_push)(struct atm_vcc *vcc, struct sk_buff *skb); |
137742cf | 70 | void (*old_pop)(struct atm_vcc *vcc, struct sk_buff *skb); |
1da177e4 LT |
71 | enum br2684_encaps encaps; |
72 | struct list_head brvccs; | |
73 | #ifdef CONFIG_ATM_BR2684_IPFILTER | |
74 | struct br2684_filter filter; | |
75 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ | |
95c96174 | 76 | unsigned int copies_needed, copies_failed; |
ae088d66 | 77 | atomic_t qspace; |
1da177e4 LT |
78 | }; |
79 | ||
80 | struct br2684_dev { | |
81 | struct net_device *net_dev; | |
82 | struct list_head br2684_devs; | |
83 | int number; | |
fb64c735 | 84 | struct list_head brvccs; /* one device <=> one vcc (before xmas) */ |
1da177e4 | 85 | int mac_was_set; |
097b19a9 | 86 | enum br2684_payload payload; |
1da177e4 LT |
87 | }; |
88 | ||
89 | /* | |
90 | * This lock should be held for writing any time the list of devices or | |
91 | * their attached vcc's could be altered. It should be held for reading | |
92 | * any time these are being queried. Note that we sometimes need to | |
93 | * do read-locking under interrupt context, so write locking must block | |
94 | * the current CPU's interrupts | |
95 | */ | |
96 | static DEFINE_RWLOCK(devs_lock); | |
97 | ||
98 | static LIST_HEAD(br2684_devs); | |
99 | ||
100 | static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev) | |
101 | { | |
37d66800 | 102 | return netdev_priv(net_dev); |
1da177e4 LT |
103 | } |
104 | ||
105 | static inline struct net_device *list_entry_brdev(const struct list_head *le) | |
106 | { | |
107 | return list_entry(le, struct br2684_dev, br2684_devs)->net_dev; | |
108 | } | |
109 | ||
110 | static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc) | |
111 | { | |
fb64c735 | 112 | return (struct br2684_vcc *)(atmvcc->user_back); |
1da177e4 LT |
113 | } |
114 | ||
115 | static inline struct br2684_vcc *list_entry_brvcc(const struct list_head *le) | |
116 | { | |
117 | return list_entry(le, struct br2684_vcc, brvccs); | |
118 | } | |
119 | ||
120 | /* Caller should hold read_lock(&devs_lock) */ | |
121 | static struct net_device *br2684_find_dev(const struct br2684_if_spec *s) | |
122 | { | |
123 | struct list_head *lh; | |
124 | struct net_device *net_dev; | |
125 | switch (s->method) { | |
126 | case BR2684_FIND_BYNUM: | |
127 | list_for_each(lh, &br2684_devs) { | |
128 | net_dev = list_entry_brdev(lh); | |
129 | if (BRPRIV(net_dev)->number == s->spec.devnum) | |
130 | return net_dev; | |
131 | } | |
132 | break; | |
133 | case BR2684_FIND_BYIFNAME: | |
134 | list_for_each(lh, &br2684_devs) { | |
135 | net_dev = list_entry_brdev(lh); | |
136 | if (!strncmp(net_dev->name, s->spec.ifname, IFNAMSIZ)) | |
137 | return net_dev; | |
138 | } | |
139 | break; | |
140 | } | |
141 | return NULL; | |
142 | } | |
143 | ||
00506612 KH |
144 | static int atm_dev_event(struct notifier_block *this, unsigned long event, |
145 | void *arg) | |
146 | { | |
147 | struct atm_dev *atm_dev = arg; | |
148 | struct list_head *lh; | |
149 | struct net_device *net_dev; | |
150 | struct br2684_vcc *brvcc; | |
151 | struct atm_vcc *atm_vcc; | |
152 | unsigned long flags; | |
153 | ||
154 | pr_debug("event=%ld dev=%p\n", event, atm_dev); | |
155 | ||
156 | read_lock_irqsave(&devs_lock, flags); | |
157 | list_for_each(lh, &br2684_devs) { | |
158 | net_dev = list_entry_brdev(lh); | |
159 | ||
160 | list_for_each_entry(brvcc, &BRPRIV(net_dev)->brvccs, brvccs) { | |
161 | atm_vcc = brvcc->atmvcc; | |
162 | if (atm_vcc && brvcc->atmvcc->dev == atm_dev) { | |
163 | ||
164 | if (atm_vcc->dev->signal == ATM_PHY_SIG_LOST) | |
165 | netif_carrier_off(net_dev); | |
166 | else | |
167 | netif_carrier_on(net_dev); | |
168 | ||
169 | } | |
170 | } | |
171 | } | |
172 | read_unlock_irqrestore(&devs_lock, flags); | |
173 | ||
174 | return NOTIFY_DONE; | |
175 | } | |
176 | ||
177 | static struct notifier_block atm_dev_notifier = { | |
178 | .notifier_call = atm_dev_event, | |
179 | }; | |
180 | ||
137742cf KH |
181 | /* chained vcc->pop function. Check if we should wake the netif_queue */ |
182 | static void br2684_pop(struct atm_vcc *vcc, struct sk_buff *skb) | |
183 | { | |
184 | struct br2684_vcc *brvcc = BR2684_VCC(vcc); | |
137742cf | 185 | |
ae088d66 | 186 | pr_debug("(vcc %p ; net_dev %p )\n", vcc, brvcc->device); |
137742cf KH |
187 | brvcc->old_pop(vcc, skb); |
188 | ||
ae088d66 DW |
189 | /* If the queue space just went up from zero, wake */ |
190 | if (atomic_inc_return(&brvcc->qspace) == 1) | |
191 | netif_wake_queue(brvcc->device); | |
137742cf | 192 | } |
ae088d66 | 193 | |
1da177e4 LT |
194 | /* |
195 | * Send a packet out a particular vcc. Not to useful right now, but paves | |
196 | * the way for multiple vcc's per itf. Returns true if we can send, | |
197 | * otherwise false | |
198 | */ | |
410e9d8f | 199 | static int br2684_xmit_vcc(struct sk_buff *skb, struct net_device *dev, |
fb64c735 | 200 | struct br2684_vcc *brvcc) |
1da177e4 | 201 | { |
410e9d8f | 202 | struct br2684_dev *brdev = BRPRIV(dev); |
1da177e4 | 203 | struct atm_vcc *atmvcc; |
9e667b29 PH |
204 | int minheadroom = (brvcc->encaps == e_llc) ? |
205 | ((brdev->payload == p_bridged) ? | |
206 | sizeof(llc_oui_pid_pad) : sizeof(llc_oui_ipv4)) : | |
207 | ((brdev->payload == p_bridged) ? BR2684_PAD_LEN : 0); | |
097b19a9 | 208 | |
1da177e4 LT |
209 | if (skb_headroom(skb) < minheadroom) { |
210 | struct sk_buff *skb2 = skb_realloc_headroom(skb, minheadroom); | |
211 | brvcc->copies_needed++; | |
212 | dev_kfree_skb(skb); | |
213 | if (skb2 == NULL) { | |
214 | brvcc->copies_failed++; | |
215 | return 0; | |
216 | } | |
217 | skb = skb2; | |
218 | } | |
097b19a9 EK |
219 | |
220 | if (brvcc->encaps == e_llc) { | |
221 | if (brdev->payload == p_bridged) { | |
222 | skb_push(skb, sizeof(llc_oui_pid_pad)); | |
fb64c735 CW |
223 | skb_copy_to_linear_data(skb, llc_oui_pid_pad, |
224 | sizeof(llc_oui_pid_pad)); | |
097b19a9 EK |
225 | } else if (brdev->payload == p_routed) { |
226 | unsigned short prot = ntohs(skb->protocol); | |
227 | ||
228 | skb_push(skb, sizeof(llc_oui_ipv4)); | |
229 | switch (prot) { | |
fb64c735 CW |
230 | case ETH_P_IP: |
231 | skb_copy_to_linear_data(skb, llc_oui_ipv4, | |
232 | sizeof(llc_oui_ipv4)); | |
233 | break; | |
234 | case ETH_P_IPV6: | |
235 | skb_copy_to_linear_data(skb, llc_oui_ipv6, | |
236 | sizeof(llc_oui_ipv6)); | |
237 | break; | |
238 | default: | |
239 | dev_kfree_skb(skb); | |
240 | return 0; | |
097b19a9 EK |
241 | } |
242 | } | |
7e903c2a EK |
243 | } else { /* e_vc */ |
244 | if (brdev->payload == p_bridged) { | |
245 | skb_push(skb, 2); | |
097b19a9 | 246 | memset(skb->data, 0, 2); |
7e903c2a | 247 | } |
097b19a9 | 248 | } |
1da177e4 LT |
249 | skb_debug(skb); |
250 | ||
251 | ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc; | |
52240062 | 252 | pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev); |
1da177e4 LT |
253 | atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc); |
254 | ATM_SKB(skb)->atm_options = atmvcc->atm_options; | |
410e9d8f SH |
255 | dev->stats.tx_packets++; |
256 | dev->stats.tx_bytes += skb->len; | |
137742cf | 257 | |
ae088d66 DW |
258 | if (atomic_dec_return(&brvcc->qspace) < 1) { |
259 | /* No more please! */ | |
137742cf | 260 | netif_stop_queue(brvcc->device); |
ae088d66 DW |
261 | /* We might have raced with br2684_pop() */ |
262 | if (unlikely(atomic_read(&brvcc->qspace) > 0)) | |
263 | netif_wake_queue(brvcc->device); | |
137742cf KH |
264 | } |
265 | ||
ae088d66 DW |
266 | /* If this fails immediately, the skb will be freed and br2684_pop() |
267 | will wake the queue if appropriate. Just return an error so that | |
268 | the stats are updated correctly */ | |
269 | return !atmvcc->send(atmvcc, skb); | |
1da177e4 LT |
270 | } |
271 | ||
61c33e01 MBJ |
272 | static inline struct br2684_vcc *pick_outgoing_vcc(const struct sk_buff *skb, |
273 | const struct br2684_dev *brdev) | |
1da177e4 | 274 | { |
fb64c735 | 275 | return list_empty(&brdev->brvccs) ? NULL : list_entry_brvcc(brdev->brvccs.next); /* 1 vcc/dev right now */ |
1da177e4 LT |
276 | } |
277 | ||
3c805a22 SH |
278 | static netdev_tx_t br2684_start_xmit(struct sk_buff *skb, |
279 | struct net_device *dev) | |
1da177e4 LT |
280 | { |
281 | struct br2684_dev *brdev = BRPRIV(dev); | |
282 | struct br2684_vcc *brvcc; | |
283 | ||
99824461 | 284 | pr_debug("skb_dst(skb)=%p\n", skb_dst(skb)); |
1da177e4 LT |
285 | read_lock(&devs_lock); |
286 | brvcc = pick_outgoing_vcc(skb, brdev); | |
287 | if (brvcc == NULL) { | |
52240062 | 288 | pr_debug("no vcc attached to dev %s\n", dev->name); |
410e9d8f SH |
289 | dev->stats.tx_errors++; |
290 | dev->stats.tx_carrier_errors++; | |
1da177e4 LT |
291 | /* netif_stop_queue(dev); */ |
292 | dev_kfree_skb(skb); | |
293 | read_unlock(&devs_lock); | |
6ed10654 | 294 | return NETDEV_TX_OK; |
1da177e4 | 295 | } |
410e9d8f | 296 | if (!br2684_xmit_vcc(skb, dev, brvcc)) { |
1da177e4 LT |
297 | /* |
298 | * We should probably use netif_*_queue() here, but that | |
299 | * involves added complication. We need to walk before | |
fb64c735 CW |
300 | * we can run. |
301 | * | |
302 | * Don't free here! this pointer might be no longer valid! | |
1da177e4 | 303 | */ |
410e9d8f SH |
304 | dev->stats.tx_errors++; |
305 | dev->stats.tx_fifo_errors++; | |
1da177e4 LT |
306 | } |
307 | read_unlock(&devs_lock); | |
6ed10654 | 308 | return NETDEV_TX_OK; |
1da177e4 LT |
309 | } |
310 | ||
1da177e4 LT |
311 | /* |
312 | * We remember when the MAC gets set, so we don't override it later with | |
313 | * the ESI of the ATM card of the first VC | |
314 | */ | |
1da177e4 LT |
315 | static int br2684_mac_addr(struct net_device *dev, void *p) |
316 | { | |
0ba25ff4 | 317 | int err = eth_mac_addr(dev, p); |
1da177e4 LT |
318 | if (!err) |
319 | BRPRIV(dev)->mac_was_set = 1; | |
320 | return err; | |
321 | } | |
322 | ||
323 | #ifdef CONFIG_ATM_BR2684_IPFILTER | |
324 | /* this IOCTL is experimental. */ | |
fb64c735 | 325 | static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg) |
1da177e4 LT |
326 | { |
327 | struct br2684_vcc *brvcc; | |
328 | struct br2684_filter_set fs; | |
329 | ||
330 | if (copy_from_user(&fs, arg, sizeof fs)) | |
331 | return -EFAULT; | |
332 | if (fs.ifspec.method != BR2684_FIND_BYNOTHING) { | |
333 | /* | |
334 | * This is really a per-vcc thing, but we can also search | |
fb64c735 | 335 | * by device. |
1da177e4 LT |
336 | */ |
337 | struct br2684_dev *brdev; | |
338 | read_lock(&devs_lock); | |
339 | brdev = BRPRIV(br2684_find_dev(&fs.ifspec)); | |
641d729e JP |
340 | if (brdev == NULL || list_empty(&brdev->brvccs) || |
341 | brdev->brvccs.next != brdev->brvccs.prev) /* >1 VCC */ | |
1da177e4 LT |
342 | brvcc = NULL; |
343 | else | |
344 | brvcc = list_entry_brvcc(brdev->brvccs.next); | |
345 | read_unlock(&devs_lock); | |
346 | if (brvcc == NULL) | |
347 | return -ESRCH; | |
348 | } else | |
349 | brvcc = BR2684_VCC(atmvcc); | |
350 | memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter)); | |
351 | return 0; | |
352 | } | |
353 | ||
354 | /* Returns 1 if packet should be dropped */ | |
355 | static inline int | |
30d492da | 356 | packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb) |
1da177e4 LT |
357 | { |
358 | if (brvcc->filter.netmask == 0) | |
fb64c735 | 359 | return 0; /* no filter in place */ |
acde4855 | 360 | if (type == htons(ETH_P_IP) && |
fb64c735 | 361 | (((struct iphdr *)(skb->data))->daddr & brvcc->filter. |
1da177e4 LT |
362 | netmask) == brvcc->filter.prefix) |
363 | return 0; | |
acde4855 | 364 | if (type == htons(ETH_P_ARP)) |
1da177e4 | 365 | return 0; |
fb64c735 CW |
366 | /* |
367 | * TODO: we should probably filter ARPs too.. don't want to have | |
368 | * them returning values that don't make sense, or is that ok? | |
1da177e4 LT |
369 | */ |
370 | return 1; /* drop */ | |
371 | } | |
372 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ | |
373 | ||
374 | static void br2684_close_vcc(struct br2684_vcc *brvcc) | |
375 | { | |
52240062 | 376 | pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device); |
1da177e4 LT |
377 | write_lock_irq(&devs_lock); |
378 | list_del(&brvcc->brvccs); | |
379 | write_unlock_irq(&devs_lock); | |
380 | brvcc->atmvcc->user_back = NULL; /* what about vcc->recvq ??? */ | |
381 | brvcc->old_push(brvcc->atmvcc, NULL); /* pass on the bad news */ | |
382 | kfree(brvcc); | |
383 | module_put(THIS_MODULE); | |
384 | } | |
385 | ||
386 | /* when AAL5 PDU comes in: */ | |
387 | static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb) | |
388 | { | |
389 | struct br2684_vcc *brvcc = BR2684_VCC(atmvcc); | |
390 | struct net_device *net_dev = brvcc->device; | |
391 | struct br2684_dev *brdev = BRPRIV(net_dev); | |
1da177e4 | 392 | |
99824461 | 393 | pr_debug("\n"); |
1da177e4 LT |
394 | |
395 | if (unlikely(skb == NULL)) { | |
396 | /* skb==NULL means VCC is being destroyed */ | |
397 | br2684_close_vcc(brvcc); | |
398 | if (list_empty(&brdev->brvccs)) { | |
1e0ba006 | 399 | write_lock_irq(&devs_lock); |
1da177e4 | 400 | list_del(&brdev->br2684_devs); |
1e0ba006 | 401 | write_unlock_irq(&devs_lock); |
1da177e4 | 402 | unregister_netdev(net_dev); |
5f6b1ea4 | 403 | free_netdev(net_dev); |
1da177e4 LT |
404 | } |
405 | return; | |
406 | } | |
407 | ||
408 | skb_debug(skb); | |
409 | atm_return(atmvcc, skb->truesize); | |
52240062 | 410 | pr_debug("skb from brdev %p\n", brdev); |
1da177e4 | 411 | if (brvcc->encaps == e_llc) { |
097b19a9 EK |
412 | |
413 | if (skb->len > 7 && skb->data[7] == 0x01) | |
414 | __skb_trim(skb, skb->len - 4); | |
415 | ||
416 | /* accept packets that have "ipv[46]" in the snap header */ | |
641d729e JP |
417 | if ((skb->len >= (sizeof(llc_oui_ipv4))) && |
418 | (memcmp(skb->data, llc_oui_ipv4, | |
419 | sizeof(llc_oui_ipv4) - BR2684_ETHERTYPE_LEN) == 0)) { | |
420 | if (memcmp(skb->data + 6, ethertype_ipv6, | |
421 | sizeof(ethertype_ipv6)) == 0) | |
60678040 | 422 | skb->protocol = htons(ETH_P_IPV6); |
641d729e JP |
423 | else if (memcmp(skb->data + 6, ethertype_ipv4, |
424 | sizeof(ethertype_ipv4)) == 0) | |
60678040 | 425 | skb->protocol = htons(ETH_P_IP); |
7e903c2a EK |
426 | else |
427 | goto error; | |
097b19a9 EK |
428 | skb_pull(skb, sizeof(llc_oui_ipv4)); |
429 | skb_reset_network_header(skb); | |
430 | skb->pkt_type = PACKET_HOST; | |
641d729e JP |
431 | /* |
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 | */ | |
097b19a9 | 436 | } else if ((skb->len >= sizeof(llc_oui_pid_pad)) && |
fb64c735 | 437 | (memcmp(skb->data, llc_oui_pid_pad, 7) == 0)) { |
097b19a9 EK |
438 | skb_pull(skb, sizeof(llc_oui_pid_pad)); |
439 | skb->protocol = eth_type_trans(skb, net_dev); | |
7e903c2a EK |
440 | } else |
441 | goto error; | |
1da177e4 | 442 | |
7e903c2a EK |
443 | } else { /* e_vc */ |
444 | if (brdev->payload == p_routed) { | |
445 | struct iphdr *iph; | |
446 | ||
447 | skb_reset_network_header(skb); | |
448 | iph = ip_hdr(skb); | |
449 | if (iph->version == 4) | |
60678040 | 450 | skb->protocol = htons(ETH_P_IP); |
7e903c2a | 451 | else if (iph->version == 6) |
60678040 | 452 | skb->protocol = htons(ETH_P_IPV6); |
7e903c2a EK |
453 | else |
454 | goto error; | |
455 | skb->pkt_type = PACKET_HOST; | |
456 | } else { /* p_bridged */ | |
457 | /* first 2 chars should be 0 */ | |
befc93fe | 458 | if (memcmp(skb->data, pad, BR2684_PAD_LEN) != 0) |
7e903c2a EK |
459 | goto error; |
460 | skb_pull(skb, BR2684_PAD_LEN); | |
461 | skb->protocol = eth_type_trans(skb, net_dev); | |
1da177e4 | 462 | } |
1da177e4 LT |
463 | } |
464 | ||
1da177e4 | 465 | #ifdef CONFIG_ATM_BR2684_IPFILTER |
7e903c2a EK |
466 | if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb))) |
467 | goto dropped; | |
1da177e4 LT |
468 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ |
469 | skb->dev = net_dev; | |
470 | ATM_SKB(skb)->vcc = atmvcc; /* needed ? */ | |
52240062 | 471 | pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol)); |
1da177e4 | 472 | skb_debug(skb); |
7e903c2a EK |
473 | /* sigh, interface is down? */ |
474 | if (unlikely(!(net_dev->flags & IFF_UP))) | |
475 | goto dropped; | |
410e9d8f SH |
476 | net_dev->stats.rx_packets++; |
477 | net_dev->stats.rx_bytes += skb->len; | |
1da177e4 LT |
478 | memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); |
479 | netif_rx(skb); | |
7e903c2a EK |
480 | return; |
481 | ||
482 | dropped: | |
410e9d8f | 483 | net_dev->stats.rx_dropped++; |
7e903c2a EK |
484 | goto free_skb; |
485 | error: | |
410e9d8f | 486 | net_dev->stats.rx_errors++; |
7e903c2a EK |
487 | free_skb: |
488 | dev_kfree_skb(skb); | |
1da177e4 LT |
489 | } |
490 | ||
fb64c735 CW |
491 | /* |
492 | * Assign a vcc to a dev | |
493 | * Note: we do not have explicit unassign, but look at _push() | |
494 | */ | |
495 | static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg) | |
1da177e4 | 496 | { |
1da177e4 | 497 | struct br2684_vcc *brvcc; |
1da177e4 LT |
498 | struct br2684_dev *brdev; |
499 | struct net_device *net_dev; | |
500 | struct atm_backend_br2684 be; | |
4e55f578 | 501 | int err; |
1da177e4 LT |
502 | |
503 | if (copy_from_user(&be, arg, sizeof be)) | |
504 | return -EFAULT; | |
0da974f4 | 505 | brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL); |
1da177e4 LT |
506 | if (!brvcc) |
507 | return -ENOMEM; | |
ae088d66 DW |
508 | /* |
509 | * Allow two packets in the ATM queue. One actually being sent, and one | |
510 | * for the ATM 'TX done' handler to send. It shouldn't take long to get | |
511 | * the next one from the netdev queue, when we need it. More than that | |
512 | * would be bufferbloat. | |
513 | */ | |
514 | atomic_set(&brvcc->qspace, 2); | |
1da177e4 LT |
515 | write_lock_irq(&devs_lock); |
516 | net_dev = br2684_find_dev(&be.ifspec); | |
517 | if (net_dev == NULL) { | |
25985edc | 518 | pr_err("tried to attach to non-existent device\n"); |
1da177e4 LT |
519 | err = -ENXIO; |
520 | goto error; | |
521 | } | |
522 | brdev = BRPRIV(net_dev); | |
523 | if (atmvcc->push == NULL) { | |
524 | err = -EBADFD; | |
525 | goto error; | |
526 | } | |
527 | if (!list_empty(&brdev->brvccs)) { | |
528 | /* Only 1 VCC/dev right now */ | |
529 | err = -EEXIST; | |
530 | goto error; | |
531 | } | |
641d729e JP |
532 | if (be.fcs_in != BR2684_FCSIN_NO || |
533 | be.fcs_out != BR2684_FCSOUT_NO || | |
534 | be.fcs_auto || be.has_vpiid || be.send_padding || | |
535 | (be.encaps != BR2684_ENCAPS_VC && | |
536 | be.encaps != BR2684_ENCAPS_LLC) || | |
537 | be.min_size != 0) { | |
1da177e4 LT |
538 | err = -EINVAL; |
539 | goto error; | |
540 | } | |
99824461 | 541 | pr_debug("vcc=%p, encaps=%d, brvcc=%p\n", atmvcc, be.encaps, brvcc); |
1da177e4 LT |
542 | if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) { |
543 | unsigned char *esi = atmvcc->dev->esi; | |
544 | if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5]) | |
545 | memcpy(net_dev->dev_addr, esi, net_dev->addr_len); | |
546 | else | |
547 | net_dev->dev_addr[2] = 1; | |
548 | } | |
549 | list_add(&brvcc->brvccs, &brdev->brvccs); | |
550 | write_unlock_irq(&devs_lock); | |
551 | brvcc->device = net_dev; | |
552 | brvcc->atmvcc = atmvcc; | |
553 | atmvcc->user_back = brvcc; | |
fb64c735 | 554 | brvcc->encaps = (enum br2684_encaps)be.encaps; |
1da177e4 | 555 | brvcc->old_push = atmvcc->push; |
137742cf | 556 | brvcc->old_pop = atmvcc->pop; |
1da177e4 LT |
557 | barrier(); |
558 | atmvcc->push = br2684_push; | |
137742cf | 559 | atmvcc->pop = br2684_pop; |
c40a27f4 | 560 | |
00506612 KH |
561 | /* initialize netdev carrier state */ |
562 | if (atmvcc->dev->signal == ATM_PHY_SIG_LOST) | |
563 | netif_carrier_off(net_dev); | |
564 | else | |
565 | netif_carrier_on(net_dev); | |
566 | ||
1da177e4 | 567 | __module_get(THIS_MODULE); |
4e55f578 JBD |
568 | |
569 | /* re-process everything received between connection setup and | |
570 | backend setup */ | |
571 | vcc_process_recv_queue(atmvcc); | |
1da177e4 | 572 | return 0; |
641d729e JP |
573 | |
574 | error: | |
1da177e4 LT |
575 | write_unlock_irq(&devs_lock); |
576 | kfree(brvcc); | |
577 | return err; | |
578 | } | |
579 | ||
0ba25ff4 SH |
580 | static const struct net_device_ops br2684_netdev_ops = { |
581 | .ndo_start_xmit = br2684_start_xmit, | |
582 | .ndo_set_mac_address = br2684_mac_addr, | |
583 | .ndo_change_mtu = eth_change_mtu, | |
584 | .ndo_validate_addr = eth_validate_addr, | |
585 | }; | |
586 | ||
2e302ebf C |
587 | static const struct net_device_ops br2684_netdev_ops_routed = { |
588 | .ndo_start_xmit = br2684_start_xmit, | |
589 | .ndo_set_mac_address = br2684_mac_addr, | |
590 | .ndo_change_mtu = eth_change_mtu | |
591 | }; | |
592 | ||
1da177e4 LT |
593 | static void br2684_setup(struct net_device *netdev) |
594 | { | |
595 | struct br2684_dev *brdev = BRPRIV(netdev); | |
596 | ||
597 | ether_setup(netdev); | |
9e667b29 | 598 | netdev->hard_header_len += sizeof(llc_oui_pid_pad); /* worst case */ |
902e5ea1 | 599 | brdev->net_dev = netdev; |
1da177e4 | 600 | |
0ba25ff4 | 601 | netdev->netdev_ops = &br2684_netdev_ops; |
1da177e4 LT |
602 | |
603 | INIT_LIST_HEAD(&brdev->brvccs); | |
604 | } | |
605 | ||
097b19a9 EK |
606 | static void br2684_setup_routed(struct net_device *netdev) |
607 | { | |
608 | struct br2684_dev *brdev = BRPRIV(netdev); | |
097b19a9 | 609 | |
2e302ebf | 610 | brdev->net_dev = netdev; |
9e667b29 | 611 | netdev->hard_header_len = sizeof(llc_oui_ipv4); /* worst case */ |
2e302ebf | 612 | netdev->netdev_ops = &br2684_netdev_ops_routed; |
097b19a9 EK |
613 | netdev->addr_len = 0; |
614 | netdev->mtu = 1500; | |
615 | netdev->type = ARPHRD_PPP; | |
616 | netdev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; | |
617 | netdev->tx_queue_len = 100; | |
618 | INIT_LIST_HEAD(&brdev->brvccs); | |
619 | } | |
620 | ||
641d729e | 621 | static int br2684_create(void __user *arg) |
1da177e4 LT |
622 | { |
623 | int err; | |
624 | struct net_device *netdev; | |
625 | struct br2684_dev *brdev; | |
626 | struct atm_newif_br2684 ni; | |
097b19a9 | 627 | enum br2684_payload payload; |
1da177e4 | 628 | |
99824461 | 629 | pr_debug("\n"); |
1da177e4 | 630 | |
641d729e | 631 | if (copy_from_user(&ni, arg, sizeof ni)) |
1da177e4 | 632 | return -EFAULT; |
097b19a9 EK |
633 | |
634 | if (ni.media & BR2684_FLAG_ROUTED) | |
635 | payload = p_routed; | |
636 | else | |
637 | payload = p_bridged; | |
fb64c735 | 638 | ni.media &= 0xffff; /* strip flags */ |
097b19a9 | 639 | |
641d729e | 640 | if (ni.media != BR2684_MEDIA_ETHERNET || ni.mtu != 1500) |
1da177e4 | 641 | return -EINVAL; |
1da177e4 LT |
642 | |
643 | netdev = alloc_netdev(sizeof(struct br2684_dev), | |
644 | ni.ifname[0] ? ni.ifname : "nas%d", | |
097b19a9 | 645 | (payload == p_routed) ? |
fb64c735 | 646 | br2684_setup_routed : br2684_setup); |
1da177e4 LT |
647 | if (!netdev) |
648 | return -ENOMEM; | |
649 | ||
650 | brdev = BRPRIV(netdev); | |
651 | ||
52240062 | 652 | pr_debug("registered netdev %s\n", netdev->name); |
1da177e4 LT |
653 | /* open, stop, do_ioctl ? */ |
654 | err = register_netdev(netdev); | |
655 | if (err < 0) { | |
99824461 | 656 | pr_err("register_netdev failed\n"); |
1da177e4 LT |
657 | free_netdev(netdev); |
658 | return err; | |
659 | } | |
660 | ||
661 | write_lock_irq(&devs_lock); | |
00506612 | 662 | |
097b19a9 | 663 | brdev->payload = payload; |
00506612 KH |
664 | |
665 | if (list_empty(&br2684_devs)) { | |
666 | /* 1st br2684 device */ | |
00506612 KH |
667 | brdev->number = 1; |
668 | } else | |
669 | brdev->number = BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1; | |
670 | ||
1da177e4 LT |
671 | list_add_tail(&brdev->br2684_devs, &br2684_devs); |
672 | write_unlock_irq(&devs_lock); | |
673 | return 0; | |
674 | } | |
675 | ||
676 | /* | |
677 | * This handles ioctls actually performed on our vcc - we must return | |
678 | * -ENOIOCTLCMD for any unrecognized ioctl | |
679 | */ | |
680 | static int br2684_ioctl(struct socket *sock, unsigned int cmd, | |
fb64c735 | 681 | unsigned long arg) |
1da177e4 LT |
682 | { |
683 | struct atm_vcc *atmvcc = ATM_SD(sock); | |
684 | void __user *argp = (void __user *)arg; | |
fb64c735 | 685 | atm_backend_t b; |
1da177e4 LT |
686 | |
687 | int err; | |
fb64c735 | 688 | switch (cmd) { |
1da177e4 | 689 | case ATM_SETBACKEND: |
fb64c735 | 690 | case ATM_NEWBACKENDIF: |
1da177e4 LT |
691 | err = get_user(b, (atm_backend_t __user *) argp); |
692 | if (err) | |
693 | return -EFAULT; | |
694 | if (b != ATM_BACKEND_BR2684) | |
695 | return -ENOIOCTLCMD; | |
696 | if (!capable(CAP_NET_ADMIN)) | |
697 | return -EPERM; | |
698 | if (cmd == ATM_SETBACKEND) | |
699 | return br2684_regvcc(atmvcc, argp); | |
700 | else | |
701 | return br2684_create(argp); | |
1da177e4 LT |
702 | #ifdef CONFIG_ATM_BR2684_IPFILTER |
703 | case BR2684_SETFILT: | |
704 | if (atmvcc->push != br2684_push) | |
705 | return -ENOIOCTLCMD; | |
706 | if (!capable(CAP_NET_ADMIN)) | |
707 | return -EPERM; | |
708 | err = br2684_setfilt(atmvcc, argp); | |
fb64c735 | 709 | |
1da177e4 LT |
710 | return err; |
711 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ | |
712 | } | |
713 | return -ENOIOCTLCMD; | |
714 | } | |
715 | ||
716 | static struct atm_ioctl br2684_ioctl_ops = { | |
fb64c735 CW |
717 | .owner = THIS_MODULE, |
718 | .ioctl = br2684_ioctl, | |
1da177e4 LT |
719 | }; |
720 | ||
1da177e4 | 721 | #ifdef CONFIG_PROC_FS |
fb64c735 | 722 | static void *br2684_seq_start(struct seq_file *seq, loff_t * pos) |
5c17d5f1 | 723 | __acquires(devs_lock) |
1da177e4 | 724 | { |
1da177e4 | 725 | read_lock(&devs_lock); |
9af97186 | 726 | return seq_list_start(&br2684_devs, *pos); |
1da177e4 LT |
727 | } |
728 | ||
fb64c735 | 729 | static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t * pos) |
1da177e4 | 730 | { |
9af97186 | 731 | return seq_list_next(v, &br2684_devs, pos); |
1da177e4 LT |
732 | } |
733 | ||
734 | static void br2684_seq_stop(struct seq_file *seq, void *v) | |
5c17d5f1 | 735 | __releases(devs_lock) |
1da177e4 LT |
736 | { |
737 | read_unlock(&devs_lock); | |
738 | } | |
739 | ||
740 | static int br2684_seq_show(struct seq_file *seq, void *v) | |
741 | { | |
9af97186 | 742 | const struct br2684_dev *brdev = list_entry(v, struct br2684_dev, |
fb64c735 | 743 | br2684_devs); |
1da177e4 LT |
744 | const struct net_device *net_dev = brdev->net_dev; |
745 | const struct br2684_vcc *brvcc; | |
746 | ||
e174961c | 747 | seq_printf(seq, "dev %.16s: num=%d, mac=%pM (%s)\n", |
0795af57 JP |
748 | net_dev->name, |
749 | brdev->number, | |
e174961c | 750 | net_dev->dev_addr, |
0795af57 | 751 | brdev->mac_was_set ? "set" : "auto"); |
1da177e4 LT |
752 | |
753 | list_for_each_entry(brvcc, &brdev->brvccs, brvccs) { | |
097b19a9 | 754 | seq_printf(seq, " vcc %d.%d.%d: encaps=%s payload=%s" |
fb64c735 CW |
755 | ", failed copies %u/%u" |
756 | "\n", brvcc->atmvcc->dev->number, | |
757 | brvcc->atmvcc->vpi, brvcc->atmvcc->vci, | |
758 | (brvcc->encaps == e_llc) ? "LLC" : "VC", | |
759 | (brdev->payload == p_bridged) ? "bridged" : "routed", | |
760 | brvcc->copies_failed, brvcc->copies_needed); | |
1da177e4 LT |
761 | #ifdef CONFIG_ATM_BR2684_IPFILTER |
762 | #define b1(var, byte) ((u8 *) &brvcc->filter.var)[byte] | |
763 | #define bs(var) b1(var, 0), b1(var, 1), b1(var, 2), b1(var, 3) | |
fb64c735 CW |
764 | if (brvcc->filter.netmask != 0) |
765 | seq_printf(seq, " filter=%d.%d.%d.%d/" | |
766 | "%d.%d.%d.%d\n", bs(prefix), bs(netmask)); | |
1da177e4 LT |
767 | #undef bs |
768 | #undef b1 | |
769 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ | |
770 | } | |
771 | return 0; | |
772 | } | |
773 | ||
56b3d975 | 774 | static const struct seq_operations br2684_seq_ops = { |
1da177e4 | 775 | .start = br2684_seq_start, |
fb64c735 CW |
776 | .next = br2684_seq_next, |
777 | .stop = br2684_seq_stop, | |
778 | .show = br2684_seq_show, | |
1da177e4 LT |
779 | }; |
780 | ||
781 | static int br2684_proc_open(struct inode *inode, struct file *file) | |
782 | { | |
783 | return seq_open(file, &br2684_seq_ops); | |
784 | } | |
785 | ||
9a32144e | 786 | static const struct file_operations br2684_proc_ops = { |
fb64c735 CW |
787 | .owner = THIS_MODULE, |
788 | .open = br2684_proc_open, | |
789 | .read = seq_read, | |
790 | .llseek = seq_lseek, | |
1da177e4 LT |
791 | .release = seq_release, |
792 | }; | |
793 | ||
794 | extern struct proc_dir_entry *atm_proc_root; /* from proc.c */ | |
fb64c735 | 795 | #endif /* CONFIG_PROC_FS */ |
1da177e4 LT |
796 | |
797 | static int __init br2684_init(void) | |
798 | { | |
799 | #ifdef CONFIG_PROC_FS | |
800 | struct proc_dir_entry *p; | |
16e297b3 WC |
801 | p = proc_create("br2684", 0, atm_proc_root, &br2684_proc_ops); |
802 | if (p == NULL) | |
1da177e4 | 803 | return -ENOMEM; |
1da177e4 LT |
804 | #endif |
805 | register_atm_ioctl(&br2684_ioctl_ops); | |
a3d6713f | 806 | register_atmdevice_notifier(&atm_dev_notifier); |
1da177e4 LT |
807 | return 0; |
808 | } | |
809 | ||
810 | static void __exit br2684_exit(void) | |
811 | { | |
812 | struct net_device *net_dev; | |
813 | struct br2684_dev *brdev; | |
814 | struct br2684_vcc *brvcc; | |
815 | deregister_atm_ioctl(&br2684_ioctl_ops); | |
816 | ||
817 | #ifdef CONFIG_PROC_FS | |
818 | remove_proc_entry("br2684", atm_proc_root); | |
819 | #endif | |
820 | ||
00506612 | 821 | |
a3d6713f | 822 | unregister_atmdevice_notifier(&atm_dev_notifier); |
00506612 | 823 | |
1da177e4 LT |
824 | while (!list_empty(&br2684_devs)) { |
825 | net_dev = list_entry_brdev(br2684_devs.next); | |
826 | brdev = BRPRIV(net_dev); | |
827 | while (!list_empty(&brdev->brvccs)) { | |
828 | brvcc = list_entry_brvcc(brdev->brvccs.next); | |
829 | br2684_close_vcc(brvcc); | |
830 | } | |
831 | ||
832 | list_del(&brdev->br2684_devs); | |
833 | unregister_netdev(net_dev); | |
5f6b1ea4 | 834 | free_netdev(net_dev); |
1da177e4 LT |
835 | } |
836 | } | |
837 | ||
838 | module_init(br2684_init); | |
839 | module_exit(br2684_exit); | |
840 | ||
841 | MODULE_AUTHOR("Marcell GAL"); | |
842 | MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5"); | |
843 | MODULE_LICENSE("GPL"); |