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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 LT |
8 | |
9 | #include <linux/module.h> | |
1da177e4 LT |
10 | #include <linux/init.h> |
11 | #include <linux/kernel.h> | |
12 | #include <linux/list.h> | |
13 | #include <linux/netdevice.h> | |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/etherdevice.h> | |
16 | #include <linux/rtnetlink.h> | |
17 | #include <linux/ip.h> | |
18 | #include <asm/uaccess.h> | |
19 | #include <net/arp.h> | |
20 | #include <linux/atm.h> | |
21 | #include <linux/atmdev.h> | |
4fc268d2 | 22 | #include <linux/capability.h> |
1da177e4 LT |
23 | #include <linux/seq_file.h> |
24 | ||
25 | #include <linux/atmbr2684.h> | |
26 | ||
27 | #include "common.h" | |
1da177e4 | 28 | |
1da177e4 LT |
29 | #ifdef SKB_DEBUG |
30 | static void skb_debug(const struct sk_buff *skb) | |
31 | { | |
32 | #define NUM2PRINT 50 | |
33 | char buf[NUM2PRINT * 3 + 1]; /* 3 chars per byte */ | |
34 | int i = 0; | |
35 | for (i = 0; i < skb->len && i < NUM2PRINT; i++) { | |
36 | sprintf(buf + i * 3, "%2.2x ", 0xff & skb->data[i]); | |
37 | } | |
38 | printk(KERN_DEBUG "br2684: skb: %s\n", buf); | |
39 | } | |
40 | #else | |
41 | #define skb_debug(skb) do {} while (0) | |
42 | #endif | |
43 | ||
097b19a9 EK |
44 | #define BR2684_ETHERTYPE_LEN 2 |
45 | #define BR2684_PAD_LEN 2 | |
46 | ||
47 | #define LLC 0xaa, 0xaa, 0x03 | |
48 | #define SNAP_BRIDGED 0x00, 0x80, 0xc2 | |
49 | #define SNAP_ROUTED 0x00, 0x00, 0x00 | |
50 | #define PID_ETHERNET 0x00, 0x07 | |
51 | #define ETHERTYPE_IPV4 0x08, 0x00 | |
52 | #define ETHERTYPE_IPV6 0x86, 0xdd | |
53 | #define PAD_BRIDGED 0x00, 0x00 | |
54 | ||
fb64c735 CW |
55 | static unsigned char ethertype_ipv4[] = { ETHERTYPE_IPV4 }; |
56 | static unsigned char ethertype_ipv6[] = { ETHERTYPE_IPV6 }; | |
1da177e4 | 57 | static unsigned char llc_oui_pid_pad[] = |
fb64c735 CW |
58 | { LLC, SNAP_BRIDGED, PID_ETHERNET, PAD_BRIDGED }; |
59 | static unsigned char llc_oui_ipv4[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV4 }; | |
60 | static unsigned char llc_oui_ipv6[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV6 }; | |
1da177e4 LT |
61 | |
62 | enum br2684_encaps { | |
fb64c735 | 63 | e_vc = BR2684_ENCAPS_VC, |
1da177e4 LT |
64 | e_llc = BR2684_ENCAPS_LLC, |
65 | }; | |
66 | ||
67 | struct br2684_vcc { | |
fb64c735 | 68 | struct atm_vcc *atmvcc; |
1da177e4 | 69 | struct net_device *device; |
fb64c735 CW |
70 | /* keep old push, pop functions for chaining */ |
71 | void (*old_push) (struct atm_vcc * vcc, struct sk_buff * skb); | |
72 | /* void (*old_pop)(struct atm_vcc *vcc, struct sk_buff *skb); */ | |
1da177e4 LT |
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 */ | |
1da177e4 | 78 | unsigned copies_needed, copies_failed; |
1da177e4 LT |
79 | }; |
80 | ||
81 | struct br2684_dev { | |
82 | struct net_device *net_dev; | |
83 | struct list_head br2684_devs; | |
84 | int number; | |
fb64c735 | 85 | struct list_head brvccs; /* one device <=> one vcc (before xmas) */ |
1da177e4 LT |
86 | struct net_device_stats stats; |
87 | int mac_was_set; | |
097b19a9 | 88 | enum br2684_payload payload; |
1da177e4 LT |
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 | { | |
fb64c735 | 104 | return (struct br2684_dev *)net_dev->priv; |
1da177e4 LT |
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 | { | |
fb64c735 | 114 | return (struct br2684_vcc *)(atmvcc->user_back); |
1da177e4 LT |
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 | /* | |
147 | * Send a packet out a particular vcc. Not to useful right now, but paves | |
148 | * the way for multiple vcc's per itf. Returns true if we can send, | |
149 | * otherwise false | |
150 | */ | |
151 | static int br2684_xmit_vcc(struct sk_buff *skb, struct br2684_dev *brdev, | |
fb64c735 | 152 | struct br2684_vcc *brvcc) |
1da177e4 LT |
153 | { |
154 | struct atm_vcc *atmvcc; | |
1da177e4 | 155 | int minheadroom = (brvcc->encaps == e_llc) ? 10 : 2; |
097b19a9 | 156 | |
1da177e4 LT |
157 | if (skb_headroom(skb) < minheadroom) { |
158 | struct sk_buff *skb2 = skb_realloc_headroom(skb, minheadroom); | |
159 | brvcc->copies_needed++; | |
160 | dev_kfree_skb(skb); | |
161 | if (skb2 == NULL) { | |
162 | brvcc->copies_failed++; | |
163 | return 0; | |
164 | } | |
165 | skb = skb2; | |
166 | } | |
097b19a9 EK |
167 | |
168 | if (brvcc->encaps == e_llc) { | |
169 | if (brdev->payload == p_bridged) { | |
170 | skb_push(skb, sizeof(llc_oui_pid_pad)); | |
fb64c735 CW |
171 | skb_copy_to_linear_data(skb, llc_oui_pid_pad, |
172 | sizeof(llc_oui_pid_pad)); | |
097b19a9 EK |
173 | } else if (brdev->payload == p_routed) { |
174 | unsigned short prot = ntohs(skb->protocol); | |
175 | ||
176 | skb_push(skb, sizeof(llc_oui_ipv4)); | |
177 | switch (prot) { | |
fb64c735 CW |
178 | case ETH_P_IP: |
179 | skb_copy_to_linear_data(skb, llc_oui_ipv4, | |
180 | sizeof(llc_oui_ipv4)); | |
181 | break; | |
182 | case ETH_P_IPV6: | |
183 | skb_copy_to_linear_data(skb, llc_oui_ipv6, | |
184 | sizeof(llc_oui_ipv6)); | |
185 | break; | |
186 | default: | |
187 | dev_kfree_skb(skb); | |
188 | return 0; | |
097b19a9 EK |
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)) { |
fb64c735 CW |
201 | /* |
202 | * We free this here for now, because we cannot know in a higher | |
203 | * layer whether the skb pointer it supplied wasn't freed yet. | |
204 | * Now, it always is. | |
205 | */ | |
1da177e4 LT |
206 | dev_kfree_skb(skb); |
207 | return 0; | |
fb64c735 | 208 | } |
1da177e4 LT |
209 | atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc); |
210 | ATM_SKB(skb)->atm_options = atmvcc->atm_options; | |
211 | brdev->stats.tx_packets++; | |
212 | brdev->stats.tx_bytes += skb->len; | |
213 | atmvcc->send(atmvcc, skb); | |
214 | return 1; | |
215 | } | |
216 | ||
217 | static inline struct br2684_vcc *pick_outgoing_vcc(struct sk_buff *skb, | |
fb64c735 | 218 | struct br2684_dev *brdev) |
1da177e4 | 219 | { |
fb64c735 | 220 | return list_empty(&brdev->brvccs) ? NULL : list_entry_brvcc(brdev->brvccs.next); /* 1 vcc/dev right now */ |
1da177e4 LT |
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 | |
fb64c735 CW |
244 | * we can run. |
245 | * | |
246 | * Don't free here! this pointer might be no longer valid! | |
1da177e4 | 247 | */ |
1da177e4 LT |
248 | brdev->stats.tx_errors++; |
249 | brdev->stats.tx_fifo_errors++; | |
250 | } | |
251 | read_unlock(&devs_lock); | |
252 | return 0; | |
253 | } | |
254 | ||
255 | static struct net_device_stats *br2684_get_stats(struct net_device *dev) | |
256 | { | |
52240062 | 257 | pr_debug("br2684_get_stats\n"); |
1da177e4 LT |
258 | return &BRPRIV(dev)->stats; |
259 | } | |
260 | ||
1da177e4 LT |
261 | /* |
262 | * We remember when the MAC gets set, so we don't override it later with | |
263 | * the ESI of the ATM card of the first VC | |
264 | */ | |
fb64c735 | 265 | static int (*my_eth_mac_addr) (struct net_device *, void *); |
1da177e4 LT |
266 | static int br2684_mac_addr(struct net_device *dev, void *p) |
267 | { | |
268 | int err = my_eth_mac_addr(dev, p); | |
269 | if (!err) | |
270 | BRPRIV(dev)->mac_was_set = 1; | |
271 | return err; | |
272 | } | |
273 | ||
274 | #ifdef CONFIG_ATM_BR2684_IPFILTER | |
275 | /* this IOCTL is experimental. */ | |
fb64c735 | 276 | static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg) |
1da177e4 LT |
277 | { |
278 | struct br2684_vcc *brvcc; | |
279 | struct br2684_filter_set fs; | |
280 | ||
281 | if (copy_from_user(&fs, arg, sizeof fs)) | |
282 | return -EFAULT; | |
283 | if (fs.ifspec.method != BR2684_FIND_BYNOTHING) { | |
284 | /* | |
285 | * This is really a per-vcc thing, but we can also search | |
fb64c735 | 286 | * by device. |
1da177e4 LT |
287 | */ |
288 | struct br2684_dev *brdev; | |
289 | read_lock(&devs_lock); | |
290 | brdev = BRPRIV(br2684_find_dev(&fs.ifspec)); | |
fb64c735 | 291 | if (brdev == NULL || list_empty(&brdev->brvccs) || brdev->brvccs.next != brdev->brvccs.prev) /* >1 VCC */ |
1da177e4 LT |
292 | brvcc = NULL; |
293 | else | |
294 | brvcc = list_entry_brvcc(brdev->brvccs.next); | |
295 | read_unlock(&devs_lock); | |
296 | if (brvcc == NULL) | |
297 | return -ESRCH; | |
298 | } else | |
299 | brvcc = BR2684_VCC(atmvcc); | |
300 | memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter)); | |
301 | return 0; | |
302 | } | |
303 | ||
304 | /* Returns 1 if packet should be dropped */ | |
305 | static inline int | |
30d492da | 306 | packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb) |
1da177e4 LT |
307 | { |
308 | if (brvcc->filter.netmask == 0) | |
fb64c735 | 309 | return 0; /* no filter in place */ |
acde4855 | 310 | if (type == htons(ETH_P_IP) && |
fb64c735 | 311 | (((struct iphdr *)(skb->data))->daddr & brvcc->filter. |
1da177e4 LT |
312 | netmask) == brvcc->filter.prefix) |
313 | return 0; | |
acde4855 | 314 | if (type == htons(ETH_P_ARP)) |
1da177e4 | 315 | return 0; |
fb64c735 CW |
316 | /* |
317 | * TODO: we should probably filter ARPs too.. don't want to have | |
318 | * them returning values that don't make sense, or is that ok? | |
1da177e4 LT |
319 | */ |
320 | return 1; /* drop */ | |
321 | } | |
322 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ | |
323 | ||
324 | static void br2684_close_vcc(struct br2684_vcc *brvcc) | |
325 | { | |
52240062 | 326 | pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device); |
1da177e4 LT |
327 | write_lock_irq(&devs_lock); |
328 | list_del(&brvcc->brvccs); | |
329 | write_unlock_irq(&devs_lock); | |
330 | brvcc->atmvcc->user_back = NULL; /* what about vcc->recvq ??? */ | |
331 | brvcc->old_push(brvcc->atmvcc, NULL); /* pass on the bad news */ | |
332 | kfree(brvcc); | |
333 | module_put(THIS_MODULE); | |
334 | } | |
335 | ||
336 | /* when AAL5 PDU comes in: */ | |
337 | static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb) | |
338 | { | |
339 | struct br2684_vcc *brvcc = BR2684_VCC(atmvcc); | |
340 | struct net_device *net_dev = brvcc->device; | |
341 | struct br2684_dev *brdev = BRPRIV(net_dev); | |
1da177e4 | 342 | |
52240062 | 343 | pr_debug("br2684_push\n"); |
1da177e4 LT |
344 | |
345 | if (unlikely(skb == NULL)) { | |
346 | /* skb==NULL means VCC is being destroyed */ | |
347 | br2684_close_vcc(brvcc); | |
348 | if (list_empty(&brdev->brvccs)) { | |
349 | read_lock(&devs_lock); | |
350 | list_del(&brdev->br2684_devs); | |
351 | read_unlock(&devs_lock); | |
352 | unregister_netdev(net_dev); | |
353 | free_netdev(net_dev); | |
354 | } | |
355 | return; | |
356 | } | |
357 | ||
358 | skb_debug(skb); | |
359 | atm_return(atmvcc, skb->truesize); | |
52240062 | 360 | pr_debug("skb from brdev %p\n", brdev); |
1da177e4 | 361 | if (brvcc->encaps == e_llc) { |
097b19a9 EK |
362 | |
363 | if (skb->len > 7 && skb->data[7] == 0x01) | |
364 | __skb_trim(skb, skb->len - 4); | |
365 | ||
366 | /* accept packets that have "ipv[46]" in the snap header */ | |
367 | if ((skb->len >= (sizeof(llc_oui_ipv4))) | |
fb64c735 CW |
368 | && |
369 | (memcmp | |
370 | (skb->data, llc_oui_ipv4, | |
371 | sizeof(llc_oui_ipv4) - BR2684_ETHERTYPE_LEN) == 0)) { | |
372 | if (memcmp | |
373 | (skb->data + 6, ethertype_ipv6, | |
374 | sizeof(ethertype_ipv6)) == 0) | |
097b19a9 | 375 | skb->protocol = __constant_htons(ETH_P_IPV6); |
fb64c735 CW |
376 | else if (memcmp |
377 | (skb->data + 6, ethertype_ipv4, | |
378 | sizeof(ethertype_ipv4)) == 0) | |
097b19a9 EK |
379 | skb->protocol = __constant_htons(ETH_P_IP); |
380 | else { | |
381 | brdev->stats.rx_errors++; | |
382 | dev_kfree_skb(skb); | |
383 | return; | |
384 | } | |
385 | skb_pull(skb, sizeof(llc_oui_ipv4)); | |
386 | skb_reset_network_header(skb); | |
387 | skb->pkt_type = PACKET_HOST; | |
fb64c735 CW |
388 | /* |
389 | * Let us waste some time for checking the encapsulation. | |
390 | * Note, that only 7 char is checked so frames with a valid FCS | |
391 | * are also accepted (but FCS is not checked of course). | |
392 | */ | |
097b19a9 | 393 | } else if ((skb->len >= sizeof(llc_oui_pid_pad)) && |
fb64c735 | 394 | (memcmp(skb->data, llc_oui_pid_pad, 7) == 0)) { |
097b19a9 EK |
395 | skb_pull(skb, sizeof(llc_oui_pid_pad)); |
396 | skb->protocol = eth_type_trans(skb, net_dev); | |
397 | } else { | |
1da177e4 LT |
398 | brdev->stats.rx_errors++; |
399 | dev_kfree_skb(skb); | |
400 | return; | |
401 | } | |
402 | ||
1da177e4 | 403 | } else { |
1da177e4 LT |
404 | /* first 2 chars should be 0 */ |
405 | if (*((u16 *) (skb->data)) != 0) { | |
406 | brdev->stats.rx_errors++; | |
407 | dev_kfree_skb(skb); | |
408 | return; | |
409 | } | |
fb64c735 | 410 | skb_pull(skb, BR2684_PAD_LEN + ETH_HLEN); /* pad, dstmac, srcmac, ethtype */ |
097b19a9 | 411 | skb->protocol = eth_type_trans(skb, net_dev); |
1da177e4 LT |
412 | } |
413 | ||
1da177e4 LT |
414 | #ifdef CONFIG_ATM_BR2684_IPFILTER |
415 | if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb))) { | |
416 | brdev->stats.rx_dropped++; | |
417 | dev_kfree_skb(skb); | |
418 | return; | |
419 | } | |
420 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ | |
421 | skb->dev = net_dev; | |
422 | ATM_SKB(skb)->vcc = atmvcc; /* needed ? */ | |
52240062 | 423 | pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol)); |
1da177e4 LT |
424 | skb_debug(skb); |
425 | if (unlikely(!(net_dev->flags & IFF_UP))) { | |
426 | /* sigh, interface is down */ | |
427 | brdev->stats.rx_dropped++; | |
428 | dev_kfree_skb(skb); | |
429 | return; | |
430 | } | |
431 | brdev->stats.rx_packets++; | |
432 | brdev->stats.rx_bytes += skb->len; | |
433 | memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); | |
434 | netif_rx(skb); | |
435 | } | |
436 | ||
fb64c735 CW |
437 | /* |
438 | * Assign a vcc to a dev | |
439 | * Note: we do not have explicit unassign, but look at _push() | |
440 | */ | |
441 | static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg) | |
1da177e4 | 442 | { |
1da177e4 LT |
443 | int err; |
444 | struct br2684_vcc *brvcc; | |
1da177e4 | 445 | struct sk_buff *skb; |
c40a27f4 | 446 | struct sk_buff_head *rq; |
1da177e4 LT |
447 | struct br2684_dev *brdev; |
448 | struct net_device *net_dev; | |
449 | struct atm_backend_br2684 be; | |
c40a27f4 | 450 | unsigned long flags; |
1da177e4 LT |
451 | |
452 | if (copy_from_user(&be, arg, sizeof be)) | |
453 | return -EFAULT; | |
0da974f4 | 454 | brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL); |
1da177e4 LT |
455 | if (!brvcc) |
456 | return -ENOMEM; | |
1da177e4 LT |
457 | write_lock_irq(&devs_lock); |
458 | net_dev = br2684_find_dev(&be.ifspec); | |
459 | if (net_dev == NULL) { | |
460 | printk(KERN_ERR | |
fb64c735 | 461 | "br2684: tried to attach to non-existant device\n"); |
1da177e4 LT |
462 | err = -ENXIO; |
463 | goto error; | |
464 | } | |
465 | brdev = BRPRIV(net_dev); | |
466 | if (atmvcc->push == NULL) { | |
467 | err = -EBADFD; | |
468 | goto error; | |
469 | } | |
470 | if (!list_empty(&brdev->brvccs)) { | |
471 | /* Only 1 VCC/dev right now */ | |
472 | err = -EEXIST; | |
473 | goto error; | |
474 | } | |
475 | if (be.fcs_in != BR2684_FCSIN_NO || be.fcs_out != BR2684_FCSOUT_NO || | |
476 | be.fcs_auto || be.has_vpiid || be.send_padding || (be.encaps != | |
fb64c735 CW |
477 | BR2684_ENCAPS_VC |
478 | && be.encaps != | |
479 | BR2684_ENCAPS_LLC) | |
480 | || be.min_size != 0) { | |
1da177e4 LT |
481 | err = -EINVAL; |
482 | goto error; | |
483 | } | |
fb64c735 CW |
484 | pr_debug("br2684_regvcc vcc=%p, encaps=%d, brvcc=%p\n", atmvcc, |
485 | be.encaps, brvcc); | |
1da177e4 LT |
486 | if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) { |
487 | unsigned char *esi = atmvcc->dev->esi; | |
488 | if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5]) | |
489 | memcpy(net_dev->dev_addr, esi, net_dev->addr_len); | |
490 | else | |
491 | net_dev->dev_addr[2] = 1; | |
492 | } | |
493 | list_add(&brvcc->brvccs, &brdev->brvccs); | |
494 | write_unlock_irq(&devs_lock); | |
495 | brvcc->device = net_dev; | |
496 | brvcc->atmvcc = atmvcc; | |
497 | atmvcc->user_back = brvcc; | |
fb64c735 | 498 | brvcc->encaps = (enum br2684_encaps)be.encaps; |
1da177e4 LT |
499 | brvcc->old_push = atmvcc->push; |
500 | barrier(); | |
501 | atmvcc->push = br2684_push; | |
c40a27f4 DM |
502 | |
503 | rq = &sk_atm(atmvcc)->sk_receive_queue; | |
504 | ||
505 | spin_lock_irqsave(&rq->lock, flags); | |
506 | if (skb_queue_empty(rq)) { | |
507 | skb = NULL; | |
508 | } else { | |
509 | /* NULL terminate the list. */ | |
510 | rq->prev->next = NULL; | |
511 | skb = rq->next; | |
512 | } | |
513 | rq->prev = rq->next = (struct sk_buff *)rq; | |
514 | rq->qlen = 0; | |
515 | spin_unlock_irqrestore(&rq->lock, flags); | |
516 | ||
517 | while (skb) { | |
518 | struct sk_buff *next = skb->next; | |
519 | ||
520 | skb->next = skb->prev = NULL; | |
1da177e4 LT |
521 | BRPRIV(skb->dev)->stats.rx_bytes -= skb->len; |
522 | BRPRIV(skb->dev)->stats.rx_packets--; | |
523 | br2684_push(atmvcc, skb); | |
c40a27f4 DM |
524 | |
525 | skb = next; | |
1da177e4 LT |
526 | } |
527 | __module_get(THIS_MODULE); | |
528 | return 0; | |
fb64c735 | 529 | error: |
1da177e4 LT |
530 | write_unlock_irq(&devs_lock); |
531 | kfree(brvcc); | |
532 | return err; | |
533 | } | |
534 | ||
535 | static void br2684_setup(struct net_device *netdev) | |
536 | { | |
537 | struct br2684_dev *brdev = BRPRIV(netdev); | |
538 | ||
539 | ether_setup(netdev); | |
540 | brdev->net_dev = netdev; | |
541 | ||
1da177e4 LT |
542 | my_eth_mac_addr = netdev->set_mac_address; |
543 | netdev->set_mac_address = br2684_mac_addr; | |
544 | netdev->hard_start_xmit = br2684_start_xmit; | |
545 | netdev->get_stats = br2684_get_stats; | |
546 | ||
547 | INIT_LIST_HEAD(&brdev->brvccs); | |
548 | } | |
549 | ||
097b19a9 EK |
550 | static void br2684_setup_routed(struct net_device *netdev) |
551 | { | |
552 | struct br2684_dev *brdev = BRPRIV(netdev); | |
553 | brdev->net_dev = netdev; | |
554 | ||
555 | netdev->hard_header_len = 0; | |
556 | my_eth_mac_addr = netdev->set_mac_address; | |
557 | netdev->set_mac_address = br2684_mac_addr; | |
558 | netdev->hard_start_xmit = br2684_start_xmit; | |
559 | netdev->get_stats = br2684_get_stats; | |
560 | netdev->addr_len = 0; | |
561 | netdev->mtu = 1500; | |
562 | netdev->type = ARPHRD_PPP; | |
563 | netdev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; | |
564 | netdev->tx_queue_len = 100; | |
565 | INIT_LIST_HEAD(&brdev->brvccs); | |
566 | } | |
567 | ||
fb64c735 | 568 | static int br2684_create(void __user * arg) |
1da177e4 LT |
569 | { |
570 | int err; | |
571 | struct net_device *netdev; | |
572 | struct br2684_dev *brdev; | |
573 | struct atm_newif_br2684 ni; | |
097b19a9 | 574 | enum br2684_payload payload; |
1da177e4 | 575 | |
52240062 | 576 | pr_debug("br2684_create\n"); |
1da177e4 LT |
577 | |
578 | if (copy_from_user(&ni, arg, sizeof ni)) { | |
579 | return -EFAULT; | |
580 | } | |
097b19a9 EK |
581 | |
582 | if (ni.media & BR2684_FLAG_ROUTED) | |
583 | payload = p_routed; | |
584 | else | |
585 | payload = p_bridged; | |
fb64c735 | 586 | ni.media &= 0xffff; /* strip flags */ |
097b19a9 | 587 | |
1da177e4 LT |
588 | if (ni.media != BR2684_MEDIA_ETHERNET || ni.mtu != 1500) { |
589 | return -EINVAL; | |
590 | } | |
591 | ||
592 | netdev = alloc_netdev(sizeof(struct br2684_dev), | |
593 | ni.ifname[0] ? ni.ifname : "nas%d", | |
097b19a9 | 594 | (payload == p_routed) ? |
fb64c735 | 595 | br2684_setup_routed : br2684_setup); |
1da177e4 LT |
596 | if (!netdev) |
597 | return -ENOMEM; | |
598 | ||
599 | brdev = BRPRIV(netdev); | |
600 | ||
52240062 | 601 | pr_debug("registered netdev %s\n", netdev->name); |
1da177e4 LT |
602 | /* open, stop, do_ioctl ? */ |
603 | err = register_netdev(netdev); | |
604 | if (err < 0) { | |
605 | printk(KERN_ERR "br2684_create: register_netdev failed\n"); | |
606 | free_netdev(netdev); | |
607 | return err; | |
608 | } | |
609 | ||
610 | write_lock_irq(&devs_lock); | |
097b19a9 | 611 | brdev->payload = payload; |
1da177e4 LT |
612 | brdev->number = list_empty(&br2684_devs) ? 1 : |
613 | BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1; | |
614 | list_add_tail(&brdev->br2684_devs, &br2684_devs); | |
615 | write_unlock_irq(&devs_lock); | |
616 | return 0; | |
617 | } | |
618 | ||
619 | /* | |
620 | * This handles ioctls actually performed on our vcc - we must return | |
621 | * -ENOIOCTLCMD for any unrecognized ioctl | |
622 | */ | |
623 | static int br2684_ioctl(struct socket *sock, unsigned int cmd, | |
fb64c735 | 624 | unsigned long arg) |
1da177e4 LT |
625 | { |
626 | struct atm_vcc *atmvcc = ATM_SD(sock); | |
627 | void __user *argp = (void __user *)arg; | |
fb64c735 | 628 | atm_backend_t b; |
1da177e4 LT |
629 | |
630 | int err; | |
fb64c735 | 631 | switch (cmd) { |
1da177e4 | 632 | case ATM_SETBACKEND: |
fb64c735 | 633 | case ATM_NEWBACKENDIF: |
1da177e4 LT |
634 | err = get_user(b, (atm_backend_t __user *) argp); |
635 | if (err) | |
636 | return -EFAULT; | |
637 | if (b != ATM_BACKEND_BR2684) | |
638 | return -ENOIOCTLCMD; | |
639 | if (!capable(CAP_NET_ADMIN)) | |
640 | return -EPERM; | |
641 | if (cmd == ATM_SETBACKEND) | |
642 | return br2684_regvcc(atmvcc, argp); | |
643 | else | |
644 | return br2684_create(argp); | |
1da177e4 LT |
645 | #ifdef CONFIG_ATM_BR2684_IPFILTER |
646 | case BR2684_SETFILT: | |
647 | if (atmvcc->push != br2684_push) | |
648 | return -ENOIOCTLCMD; | |
649 | if (!capable(CAP_NET_ADMIN)) | |
650 | return -EPERM; | |
651 | err = br2684_setfilt(atmvcc, argp); | |
fb64c735 | 652 | |
1da177e4 LT |
653 | return err; |
654 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ | |
655 | } | |
656 | return -ENOIOCTLCMD; | |
657 | } | |
658 | ||
659 | static struct atm_ioctl br2684_ioctl_ops = { | |
fb64c735 CW |
660 | .owner = THIS_MODULE, |
661 | .ioctl = br2684_ioctl, | |
1da177e4 LT |
662 | }; |
663 | ||
1da177e4 | 664 | #ifdef CONFIG_PROC_FS |
fb64c735 | 665 | static void *br2684_seq_start(struct seq_file *seq, loff_t * pos) |
5c17d5f1 | 666 | __acquires(devs_lock) |
1da177e4 | 667 | { |
1da177e4 | 668 | read_lock(&devs_lock); |
9af97186 | 669 | return seq_list_start(&br2684_devs, *pos); |
1da177e4 LT |
670 | } |
671 | ||
fb64c735 | 672 | static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t * pos) |
1da177e4 | 673 | { |
9af97186 | 674 | return seq_list_next(v, &br2684_devs, pos); |
1da177e4 LT |
675 | } |
676 | ||
677 | static void br2684_seq_stop(struct seq_file *seq, void *v) | |
5c17d5f1 | 678 | __releases(devs_lock) |
1da177e4 LT |
679 | { |
680 | read_unlock(&devs_lock); | |
681 | } | |
682 | ||
683 | static int br2684_seq_show(struct seq_file *seq, void *v) | |
684 | { | |
9af97186 | 685 | const struct br2684_dev *brdev = list_entry(v, struct br2684_dev, |
fb64c735 | 686 | br2684_devs); |
1da177e4 LT |
687 | const struct net_device *net_dev = brdev->net_dev; |
688 | const struct br2684_vcc *brvcc; | |
0795af57 | 689 | DECLARE_MAC_BUF(mac); |
1da177e4 | 690 | |
0795af57 JP |
691 | seq_printf(seq, "dev %.16s: num=%d, mac=%s (%s)\n", |
692 | net_dev->name, | |
693 | brdev->number, | |
694 | print_mac(mac, net_dev->dev_addr), | |
695 | brdev->mac_was_set ? "set" : "auto"); | |
1da177e4 LT |
696 | |
697 | list_for_each_entry(brvcc, &brdev->brvccs, brvccs) { | |
097b19a9 | 698 | seq_printf(seq, " vcc %d.%d.%d: encaps=%s payload=%s" |
fb64c735 CW |
699 | ", failed copies %u/%u" |
700 | "\n", brvcc->atmvcc->dev->number, | |
701 | brvcc->atmvcc->vpi, brvcc->atmvcc->vci, | |
702 | (brvcc->encaps == e_llc) ? "LLC" : "VC", | |
703 | (brdev->payload == p_bridged) ? "bridged" : "routed", | |
704 | brvcc->copies_failed, brvcc->copies_needed); | |
1da177e4 LT |
705 | #ifdef CONFIG_ATM_BR2684_IPFILTER |
706 | #define b1(var, byte) ((u8 *) &brvcc->filter.var)[byte] | |
707 | #define bs(var) b1(var, 0), b1(var, 1), b1(var, 2), b1(var, 3) | |
fb64c735 CW |
708 | if (brvcc->filter.netmask != 0) |
709 | seq_printf(seq, " filter=%d.%d.%d.%d/" | |
710 | "%d.%d.%d.%d\n", bs(prefix), bs(netmask)); | |
1da177e4 LT |
711 | #undef bs |
712 | #undef b1 | |
713 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ | |
714 | } | |
715 | return 0; | |
716 | } | |
717 | ||
56b3d975 | 718 | static const struct seq_operations br2684_seq_ops = { |
1da177e4 | 719 | .start = br2684_seq_start, |
fb64c735 CW |
720 | .next = br2684_seq_next, |
721 | .stop = br2684_seq_stop, | |
722 | .show = br2684_seq_show, | |
1da177e4 LT |
723 | }; |
724 | ||
725 | static int br2684_proc_open(struct inode *inode, struct file *file) | |
726 | { | |
727 | return seq_open(file, &br2684_seq_ops); | |
728 | } | |
729 | ||
9a32144e | 730 | static const struct file_operations br2684_proc_ops = { |
fb64c735 CW |
731 | .owner = THIS_MODULE, |
732 | .open = br2684_proc_open, | |
733 | .read = seq_read, | |
734 | .llseek = seq_lseek, | |
1da177e4 LT |
735 | .release = seq_release, |
736 | }; | |
737 | ||
738 | extern struct proc_dir_entry *atm_proc_root; /* from proc.c */ | |
fb64c735 | 739 | #endif /* CONFIG_PROC_FS */ |
1da177e4 LT |
740 | |
741 | static int __init br2684_init(void) | |
742 | { | |
743 | #ifdef CONFIG_PROC_FS | |
744 | struct proc_dir_entry *p; | |
16e297b3 WC |
745 | p = proc_create("br2684", 0, atm_proc_root, &br2684_proc_ops); |
746 | if (p == NULL) | |
1da177e4 | 747 | return -ENOMEM; |
1da177e4 LT |
748 | #endif |
749 | register_atm_ioctl(&br2684_ioctl_ops); | |
750 | return 0; | |
751 | } | |
752 | ||
753 | static void __exit br2684_exit(void) | |
754 | { | |
755 | struct net_device *net_dev; | |
756 | struct br2684_dev *brdev; | |
757 | struct br2684_vcc *brvcc; | |
758 | deregister_atm_ioctl(&br2684_ioctl_ops); | |
759 | ||
760 | #ifdef CONFIG_PROC_FS | |
761 | remove_proc_entry("br2684", atm_proc_root); | |
762 | #endif | |
763 | ||
764 | while (!list_empty(&br2684_devs)) { | |
765 | net_dev = list_entry_brdev(br2684_devs.next); | |
766 | brdev = BRPRIV(net_dev); | |
767 | while (!list_empty(&brdev->brvccs)) { | |
768 | brvcc = list_entry_brvcc(brdev->brvccs.next); | |
769 | br2684_close_vcc(brvcc); | |
770 | } | |
771 | ||
772 | list_del(&brdev->br2684_devs); | |
773 | unregister_netdev(net_dev); | |
774 | free_netdev(net_dev); | |
775 | } | |
776 | } | |
777 | ||
778 | module_init(br2684_init); | |
779 | module_exit(br2684_exit); | |
780 | ||
781 | MODULE_AUTHOR("Marcell GAL"); | |
782 | MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5"); | |
783 | MODULE_LICENSE("GPL"); |