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 | ||
61c33e01 MBJ |
55 | static const unsigned char ethertype_ipv4[] = { ETHERTYPE_IPV4 }; |
56 | static const unsigned char ethertype_ipv6[] = { ETHERTYPE_IPV6 }; | |
57 | static const unsigned char llc_oui_pid_pad[] = | |
fb64c735 | 58 | { LLC, SNAP_BRIDGED, PID_ETHERNET, PAD_BRIDGED }; |
61c33e01 MBJ |
59 | static const unsigned char llc_oui_ipv4[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV4 }; |
60 | static const 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 | } | |
7e903c2a EK |
191 | } else { /* e_vc */ |
192 | if (brdev->payload == p_bridged) { | |
193 | skb_push(skb, 2); | |
097b19a9 | 194 | memset(skb->data, 0, 2); |
7e903c2a EK |
195 | } else { /* p_routed */ |
196 | skb_pull(skb, ETH_HLEN); | |
197 | } | |
097b19a9 | 198 | } |
1da177e4 LT |
199 | skb_debug(skb); |
200 | ||
201 | ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc; | |
52240062 | 202 | pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev); |
1da177e4 | 203 | if (!atm_may_send(atmvcc, skb->truesize)) { |
fb64c735 CW |
204 | /* |
205 | * We free this here for now, because we cannot know in a higher | |
206 | * layer whether the skb pointer it supplied wasn't freed yet. | |
207 | * Now, it always is. | |
208 | */ | |
1da177e4 LT |
209 | dev_kfree_skb(skb); |
210 | return 0; | |
fb64c735 | 211 | } |
1da177e4 LT |
212 | atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc); |
213 | ATM_SKB(skb)->atm_options = atmvcc->atm_options; | |
214 | brdev->stats.tx_packets++; | |
215 | brdev->stats.tx_bytes += skb->len; | |
216 | atmvcc->send(atmvcc, skb); | |
217 | return 1; | |
218 | } | |
219 | ||
61c33e01 MBJ |
220 | static inline struct br2684_vcc *pick_outgoing_vcc(const struct sk_buff *skb, |
221 | const struct br2684_dev *brdev) | |
1da177e4 | 222 | { |
fb64c735 | 223 | return list_empty(&brdev->brvccs) ? NULL : list_entry_brvcc(brdev->brvccs.next); /* 1 vcc/dev right now */ |
1da177e4 LT |
224 | } |
225 | ||
226 | static int br2684_start_xmit(struct sk_buff *skb, struct net_device *dev) | |
227 | { | |
228 | struct br2684_dev *brdev = BRPRIV(dev); | |
229 | struct br2684_vcc *brvcc; | |
230 | ||
52240062 | 231 | pr_debug("br2684_start_xmit, skb->dst=%p\n", skb->dst); |
1da177e4 LT |
232 | read_lock(&devs_lock); |
233 | brvcc = pick_outgoing_vcc(skb, brdev); | |
234 | if (brvcc == NULL) { | |
52240062 | 235 | pr_debug("no vcc attached to dev %s\n", dev->name); |
1da177e4 LT |
236 | brdev->stats.tx_errors++; |
237 | brdev->stats.tx_carrier_errors++; | |
238 | /* netif_stop_queue(dev); */ | |
239 | dev_kfree_skb(skb); | |
240 | read_unlock(&devs_lock); | |
4f55cd10 | 241 | return 0; |
1da177e4 LT |
242 | } |
243 | if (!br2684_xmit_vcc(skb, brdev, brvcc)) { | |
244 | /* | |
245 | * We should probably use netif_*_queue() here, but that | |
246 | * involves added complication. We need to walk before | |
fb64c735 CW |
247 | * we can run. |
248 | * | |
249 | * Don't free here! this pointer might be no longer valid! | |
1da177e4 | 250 | */ |
1da177e4 LT |
251 | brdev->stats.tx_errors++; |
252 | brdev->stats.tx_fifo_errors++; | |
253 | } | |
254 | read_unlock(&devs_lock); | |
255 | return 0; | |
256 | } | |
257 | ||
258 | static struct net_device_stats *br2684_get_stats(struct net_device *dev) | |
259 | { | |
52240062 | 260 | pr_debug("br2684_get_stats\n"); |
1da177e4 LT |
261 | return &BRPRIV(dev)->stats; |
262 | } | |
263 | ||
1da177e4 LT |
264 | /* |
265 | * We remember when the MAC gets set, so we don't override it later with | |
266 | * the ESI of the ATM card of the first VC | |
267 | */ | |
fb64c735 | 268 | static int (*my_eth_mac_addr) (struct net_device *, void *); |
1da177e4 LT |
269 | static int br2684_mac_addr(struct net_device *dev, void *p) |
270 | { | |
271 | int err = my_eth_mac_addr(dev, p); | |
272 | if (!err) | |
273 | BRPRIV(dev)->mac_was_set = 1; | |
274 | return err; | |
275 | } | |
276 | ||
277 | #ifdef CONFIG_ATM_BR2684_IPFILTER | |
278 | /* this IOCTL is experimental. */ | |
fb64c735 | 279 | static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg) |
1da177e4 LT |
280 | { |
281 | struct br2684_vcc *brvcc; | |
282 | struct br2684_filter_set fs; | |
283 | ||
284 | if (copy_from_user(&fs, arg, sizeof fs)) | |
285 | return -EFAULT; | |
286 | if (fs.ifspec.method != BR2684_FIND_BYNOTHING) { | |
287 | /* | |
288 | * This is really a per-vcc thing, but we can also search | |
fb64c735 | 289 | * by device. |
1da177e4 LT |
290 | */ |
291 | struct br2684_dev *brdev; | |
292 | read_lock(&devs_lock); | |
293 | brdev = BRPRIV(br2684_find_dev(&fs.ifspec)); | |
fb64c735 | 294 | if (brdev == NULL || list_empty(&brdev->brvccs) || brdev->brvccs.next != brdev->brvccs.prev) /* >1 VCC */ |
1da177e4 LT |
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) | |
fb64c735 | 312 | return 0; /* no filter in place */ |
acde4855 | 313 | if (type == htons(ETH_P_IP) && |
fb64c735 | 314 | (((struct iphdr *)(skb->data))->daddr & brvcc->filter. |
1da177e4 LT |
315 | netmask) == brvcc->filter.prefix) |
316 | return 0; | |
acde4855 | 317 | if (type == htons(ETH_P_ARP)) |
1da177e4 | 318 | return 0; |
fb64c735 CW |
319 | /* |
320 | * TODO: we should probably filter ARPs too.. don't want to have | |
321 | * them returning values that don't make sense, or is that ok? | |
1da177e4 LT |
322 | */ |
323 | return 1; /* drop */ | |
324 | } | |
325 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ | |
326 | ||
327 | static void br2684_close_vcc(struct br2684_vcc *brvcc) | |
328 | { | |
52240062 | 329 | pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device); |
1da177e4 LT |
330 | write_lock_irq(&devs_lock); |
331 | list_del(&brvcc->brvccs); | |
332 | write_unlock_irq(&devs_lock); | |
333 | brvcc->atmvcc->user_back = NULL; /* what about vcc->recvq ??? */ | |
334 | brvcc->old_push(brvcc->atmvcc, NULL); /* pass on the bad news */ | |
335 | kfree(brvcc); | |
336 | module_put(THIS_MODULE); | |
337 | } | |
338 | ||
339 | /* when AAL5 PDU comes in: */ | |
340 | static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb) | |
341 | { | |
342 | struct br2684_vcc *brvcc = BR2684_VCC(atmvcc); | |
343 | struct net_device *net_dev = brvcc->device; | |
344 | struct br2684_dev *brdev = BRPRIV(net_dev); | |
1da177e4 | 345 | |
52240062 | 346 | pr_debug("br2684_push\n"); |
1da177e4 LT |
347 | |
348 | if (unlikely(skb == NULL)) { | |
349 | /* skb==NULL means VCC is being destroyed */ | |
350 | br2684_close_vcc(brvcc); | |
351 | if (list_empty(&brdev->brvccs)) { | |
1e0ba006 | 352 | write_lock_irq(&devs_lock); |
1da177e4 | 353 | list_del(&brdev->br2684_devs); |
1e0ba006 | 354 | write_unlock_irq(&devs_lock); |
1da177e4 | 355 | unregister_netdev(net_dev); |
5f6b1ea4 | 356 | free_netdev(net_dev); |
1da177e4 LT |
357 | } |
358 | return; | |
359 | } | |
360 | ||
361 | skb_debug(skb); | |
362 | atm_return(atmvcc, skb->truesize); | |
52240062 | 363 | pr_debug("skb from brdev %p\n", brdev); |
1da177e4 | 364 | if (brvcc->encaps == e_llc) { |
097b19a9 EK |
365 | |
366 | if (skb->len > 7 && skb->data[7] == 0x01) | |
367 | __skb_trim(skb, skb->len - 4); | |
368 | ||
369 | /* accept packets that have "ipv[46]" in the snap header */ | |
370 | if ((skb->len >= (sizeof(llc_oui_ipv4))) | |
fb64c735 CW |
371 | && |
372 | (memcmp | |
373 | (skb->data, llc_oui_ipv4, | |
374 | sizeof(llc_oui_ipv4) - BR2684_ETHERTYPE_LEN) == 0)) { | |
375 | if (memcmp | |
376 | (skb->data + 6, ethertype_ipv6, | |
377 | sizeof(ethertype_ipv6)) == 0) | |
097b19a9 | 378 | skb->protocol = __constant_htons(ETH_P_IPV6); |
fb64c735 CW |
379 | else if (memcmp |
380 | (skb->data + 6, ethertype_ipv4, | |
381 | sizeof(ethertype_ipv4)) == 0) | |
097b19a9 | 382 | skb->protocol = __constant_htons(ETH_P_IP); |
7e903c2a EK |
383 | else |
384 | goto error; | |
097b19a9 EK |
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); | |
7e903c2a EK |
397 | } else |
398 | goto error; | |
1da177e4 | 399 | |
7e903c2a EK |
400 | } else { /* e_vc */ |
401 | if (brdev->payload == p_routed) { | |
402 | struct iphdr *iph; | |
403 | ||
404 | skb_reset_network_header(skb); | |
405 | iph = ip_hdr(skb); | |
406 | if (iph->version == 4) | |
407 | skb->protocol = __constant_htons(ETH_P_IP); | |
408 | else if (iph->version == 6) | |
409 | skb->protocol = __constant_htons(ETH_P_IPV6); | |
410 | else | |
411 | goto error; | |
412 | skb->pkt_type = PACKET_HOST; | |
413 | } else { /* p_bridged */ | |
414 | /* first 2 chars should be 0 */ | |
415 | if (*((u16 *) (skb->data)) != 0) | |
416 | goto error; | |
417 | skb_pull(skb, BR2684_PAD_LEN); | |
418 | skb->protocol = eth_type_trans(skb, net_dev); | |
1da177e4 | 419 | } |
1da177e4 LT |
420 | } |
421 | ||
1da177e4 | 422 | #ifdef CONFIG_ATM_BR2684_IPFILTER |
7e903c2a EK |
423 | if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb))) |
424 | goto dropped; | |
1da177e4 LT |
425 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ |
426 | skb->dev = net_dev; | |
427 | ATM_SKB(skb)->vcc = atmvcc; /* needed ? */ | |
52240062 | 428 | pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol)); |
1da177e4 | 429 | skb_debug(skb); |
7e903c2a EK |
430 | /* sigh, interface is down? */ |
431 | if (unlikely(!(net_dev->flags & IFF_UP))) | |
432 | goto dropped; | |
1da177e4 LT |
433 | brdev->stats.rx_packets++; |
434 | brdev->stats.rx_bytes += skb->len; | |
435 | memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); | |
436 | netif_rx(skb); | |
7e903c2a EK |
437 | return; |
438 | ||
439 | dropped: | |
440 | brdev->stats.rx_dropped++; | |
441 | goto free_skb; | |
442 | error: | |
443 | brdev->stats.rx_errors++; | |
444 | free_skb: | |
445 | dev_kfree_skb(skb); | |
446 | return; | |
1da177e4 LT |
447 | } |
448 | ||
fb64c735 CW |
449 | /* |
450 | * Assign a vcc to a dev | |
451 | * Note: we do not have explicit unassign, but look at _push() | |
452 | */ | |
453 | static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg) | |
1da177e4 | 454 | { |
1da177e4 LT |
455 | int err; |
456 | struct br2684_vcc *brvcc; | |
1da177e4 | 457 | struct sk_buff *skb; |
c40a27f4 | 458 | struct sk_buff_head *rq; |
1da177e4 LT |
459 | struct br2684_dev *brdev; |
460 | struct net_device *net_dev; | |
461 | struct atm_backend_br2684 be; | |
c40a27f4 | 462 | unsigned long flags; |
1da177e4 LT |
463 | |
464 | if (copy_from_user(&be, arg, sizeof be)) | |
465 | return -EFAULT; | |
0da974f4 | 466 | brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL); |
1da177e4 LT |
467 | if (!brvcc) |
468 | return -ENOMEM; | |
1da177e4 LT |
469 | write_lock_irq(&devs_lock); |
470 | net_dev = br2684_find_dev(&be.ifspec); | |
471 | if (net_dev == NULL) { | |
472 | printk(KERN_ERR | |
fb64c735 | 473 | "br2684: tried to attach to non-existant device\n"); |
1da177e4 LT |
474 | err = -ENXIO; |
475 | goto error; | |
476 | } | |
477 | brdev = BRPRIV(net_dev); | |
478 | if (atmvcc->push == NULL) { | |
479 | err = -EBADFD; | |
480 | goto error; | |
481 | } | |
482 | if (!list_empty(&brdev->brvccs)) { | |
483 | /* Only 1 VCC/dev right now */ | |
484 | err = -EEXIST; | |
485 | goto error; | |
486 | } | |
487 | if (be.fcs_in != BR2684_FCSIN_NO || be.fcs_out != BR2684_FCSOUT_NO || | |
488 | be.fcs_auto || be.has_vpiid || be.send_padding || (be.encaps != | |
fb64c735 CW |
489 | BR2684_ENCAPS_VC |
490 | && be.encaps != | |
491 | BR2684_ENCAPS_LLC) | |
492 | || be.min_size != 0) { | |
1da177e4 LT |
493 | err = -EINVAL; |
494 | goto error; | |
495 | } | |
fb64c735 CW |
496 | pr_debug("br2684_regvcc vcc=%p, encaps=%d, brvcc=%p\n", atmvcc, |
497 | be.encaps, brvcc); | |
1da177e4 LT |
498 | if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) { |
499 | unsigned char *esi = atmvcc->dev->esi; | |
500 | if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5]) | |
501 | memcpy(net_dev->dev_addr, esi, net_dev->addr_len); | |
502 | else | |
503 | net_dev->dev_addr[2] = 1; | |
504 | } | |
505 | list_add(&brvcc->brvccs, &brdev->brvccs); | |
506 | write_unlock_irq(&devs_lock); | |
507 | brvcc->device = net_dev; | |
508 | brvcc->atmvcc = atmvcc; | |
509 | atmvcc->user_back = brvcc; | |
fb64c735 | 510 | brvcc->encaps = (enum br2684_encaps)be.encaps; |
1da177e4 LT |
511 | brvcc->old_push = atmvcc->push; |
512 | barrier(); | |
513 | atmvcc->push = br2684_push; | |
c40a27f4 DM |
514 | |
515 | rq = &sk_atm(atmvcc)->sk_receive_queue; | |
516 | ||
517 | spin_lock_irqsave(&rq->lock, flags); | |
518 | if (skb_queue_empty(rq)) { | |
519 | skb = NULL; | |
520 | } else { | |
521 | /* NULL terminate the list. */ | |
522 | rq->prev->next = NULL; | |
523 | skb = rq->next; | |
524 | } | |
525 | rq->prev = rq->next = (struct sk_buff *)rq; | |
526 | rq->qlen = 0; | |
527 | spin_unlock_irqrestore(&rq->lock, flags); | |
528 | ||
529 | while (skb) { | |
530 | struct sk_buff *next = skb->next; | |
531 | ||
532 | skb->next = skb->prev = NULL; | |
27141666 | 533 | br2684_push(atmvcc, skb); |
1da177e4 LT |
534 | BRPRIV(skb->dev)->stats.rx_bytes -= skb->len; |
535 | BRPRIV(skb->dev)->stats.rx_packets--; | |
c40a27f4 DM |
536 | |
537 | skb = next; | |
1da177e4 LT |
538 | } |
539 | __module_get(THIS_MODULE); | |
540 | return 0; | |
fb64c735 | 541 | error: |
1da177e4 LT |
542 | write_unlock_irq(&devs_lock); |
543 | kfree(brvcc); | |
544 | return err; | |
545 | } | |
546 | ||
547 | static void br2684_setup(struct net_device *netdev) | |
548 | { | |
549 | struct br2684_dev *brdev = BRPRIV(netdev); | |
550 | ||
551 | ether_setup(netdev); | |
552 | brdev->net_dev = netdev; | |
553 | ||
1da177e4 LT |
554 | my_eth_mac_addr = netdev->set_mac_address; |
555 | netdev->set_mac_address = br2684_mac_addr; | |
556 | netdev->hard_start_xmit = br2684_start_xmit; | |
557 | netdev->get_stats = br2684_get_stats; | |
558 | ||
559 | INIT_LIST_HEAD(&brdev->brvccs); | |
560 | } | |
561 | ||
097b19a9 EK |
562 | static void br2684_setup_routed(struct net_device *netdev) |
563 | { | |
564 | struct br2684_dev *brdev = BRPRIV(netdev); | |
565 | brdev->net_dev = netdev; | |
566 | ||
567 | netdev->hard_header_len = 0; | |
568 | my_eth_mac_addr = netdev->set_mac_address; | |
569 | netdev->set_mac_address = br2684_mac_addr; | |
570 | netdev->hard_start_xmit = br2684_start_xmit; | |
571 | netdev->get_stats = br2684_get_stats; | |
572 | netdev->addr_len = 0; | |
573 | netdev->mtu = 1500; | |
574 | netdev->type = ARPHRD_PPP; | |
575 | netdev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; | |
576 | netdev->tx_queue_len = 100; | |
577 | INIT_LIST_HEAD(&brdev->brvccs); | |
578 | } | |
579 | ||
fb64c735 | 580 | static int br2684_create(void __user * arg) |
1da177e4 LT |
581 | { |
582 | int err; | |
583 | struct net_device *netdev; | |
584 | struct br2684_dev *brdev; | |
585 | struct atm_newif_br2684 ni; | |
097b19a9 | 586 | enum br2684_payload payload; |
1da177e4 | 587 | |
52240062 | 588 | pr_debug("br2684_create\n"); |
1da177e4 LT |
589 | |
590 | if (copy_from_user(&ni, arg, sizeof ni)) { | |
591 | return -EFAULT; | |
592 | } | |
097b19a9 EK |
593 | |
594 | if (ni.media & BR2684_FLAG_ROUTED) | |
595 | payload = p_routed; | |
596 | else | |
597 | payload = p_bridged; | |
fb64c735 | 598 | ni.media &= 0xffff; /* strip flags */ |
097b19a9 | 599 | |
1da177e4 LT |
600 | if (ni.media != BR2684_MEDIA_ETHERNET || ni.mtu != 1500) { |
601 | return -EINVAL; | |
602 | } | |
603 | ||
604 | netdev = alloc_netdev(sizeof(struct br2684_dev), | |
605 | ni.ifname[0] ? ni.ifname : "nas%d", | |
097b19a9 | 606 | (payload == p_routed) ? |
fb64c735 | 607 | br2684_setup_routed : br2684_setup); |
1da177e4 LT |
608 | if (!netdev) |
609 | return -ENOMEM; | |
610 | ||
611 | brdev = BRPRIV(netdev); | |
612 | ||
52240062 | 613 | pr_debug("registered netdev %s\n", netdev->name); |
1da177e4 LT |
614 | /* open, stop, do_ioctl ? */ |
615 | err = register_netdev(netdev); | |
616 | if (err < 0) { | |
617 | printk(KERN_ERR "br2684_create: register_netdev failed\n"); | |
618 | free_netdev(netdev); | |
619 | return err; | |
620 | } | |
621 | ||
622 | write_lock_irq(&devs_lock); | |
097b19a9 | 623 | brdev->payload = payload; |
1da177e4 LT |
624 | brdev->number = list_empty(&br2684_devs) ? 1 : |
625 | BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1; | |
626 | list_add_tail(&brdev->br2684_devs, &br2684_devs); | |
627 | write_unlock_irq(&devs_lock); | |
628 | return 0; | |
629 | } | |
630 | ||
631 | /* | |
632 | * This handles ioctls actually performed on our vcc - we must return | |
633 | * -ENOIOCTLCMD for any unrecognized ioctl | |
634 | */ | |
635 | static int br2684_ioctl(struct socket *sock, unsigned int cmd, | |
fb64c735 | 636 | unsigned long arg) |
1da177e4 LT |
637 | { |
638 | struct atm_vcc *atmvcc = ATM_SD(sock); | |
639 | void __user *argp = (void __user *)arg; | |
fb64c735 | 640 | atm_backend_t b; |
1da177e4 LT |
641 | |
642 | int err; | |
fb64c735 | 643 | switch (cmd) { |
1da177e4 | 644 | case ATM_SETBACKEND: |
fb64c735 | 645 | case ATM_NEWBACKENDIF: |
1da177e4 LT |
646 | err = get_user(b, (atm_backend_t __user *) argp); |
647 | if (err) | |
648 | return -EFAULT; | |
649 | if (b != ATM_BACKEND_BR2684) | |
650 | return -ENOIOCTLCMD; | |
651 | if (!capable(CAP_NET_ADMIN)) | |
652 | return -EPERM; | |
653 | if (cmd == ATM_SETBACKEND) | |
654 | return br2684_regvcc(atmvcc, argp); | |
655 | else | |
656 | return br2684_create(argp); | |
1da177e4 LT |
657 | #ifdef CONFIG_ATM_BR2684_IPFILTER |
658 | case BR2684_SETFILT: | |
659 | if (atmvcc->push != br2684_push) | |
660 | return -ENOIOCTLCMD; | |
661 | if (!capable(CAP_NET_ADMIN)) | |
662 | return -EPERM; | |
663 | err = br2684_setfilt(atmvcc, argp); | |
fb64c735 | 664 | |
1da177e4 LT |
665 | return err; |
666 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ | |
667 | } | |
668 | return -ENOIOCTLCMD; | |
669 | } | |
670 | ||
671 | static struct atm_ioctl br2684_ioctl_ops = { | |
fb64c735 CW |
672 | .owner = THIS_MODULE, |
673 | .ioctl = br2684_ioctl, | |
1da177e4 LT |
674 | }; |
675 | ||
1da177e4 | 676 | #ifdef CONFIG_PROC_FS |
fb64c735 | 677 | static void *br2684_seq_start(struct seq_file *seq, loff_t * pos) |
5c17d5f1 | 678 | __acquires(devs_lock) |
1da177e4 | 679 | { |
1da177e4 | 680 | read_lock(&devs_lock); |
9af97186 | 681 | return seq_list_start(&br2684_devs, *pos); |
1da177e4 LT |
682 | } |
683 | ||
fb64c735 | 684 | static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t * pos) |
1da177e4 | 685 | { |
9af97186 | 686 | return seq_list_next(v, &br2684_devs, pos); |
1da177e4 LT |
687 | } |
688 | ||
689 | static void br2684_seq_stop(struct seq_file *seq, void *v) | |
5c17d5f1 | 690 | __releases(devs_lock) |
1da177e4 LT |
691 | { |
692 | read_unlock(&devs_lock); | |
693 | } | |
694 | ||
695 | static int br2684_seq_show(struct seq_file *seq, void *v) | |
696 | { | |
9af97186 | 697 | const struct br2684_dev *brdev = list_entry(v, struct br2684_dev, |
fb64c735 | 698 | br2684_devs); |
1da177e4 LT |
699 | const struct net_device *net_dev = brdev->net_dev; |
700 | const struct br2684_vcc *brvcc; | |
0795af57 | 701 | DECLARE_MAC_BUF(mac); |
1da177e4 | 702 | |
0795af57 JP |
703 | seq_printf(seq, "dev %.16s: num=%d, mac=%s (%s)\n", |
704 | net_dev->name, | |
705 | brdev->number, | |
706 | print_mac(mac, net_dev->dev_addr), | |
707 | brdev->mac_was_set ? "set" : "auto"); | |
1da177e4 LT |
708 | |
709 | list_for_each_entry(brvcc, &brdev->brvccs, brvccs) { | |
097b19a9 | 710 | seq_printf(seq, " vcc %d.%d.%d: encaps=%s payload=%s" |
fb64c735 CW |
711 | ", failed copies %u/%u" |
712 | "\n", brvcc->atmvcc->dev->number, | |
713 | brvcc->atmvcc->vpi, brvcc->atmvcc->vci, | |
714 | (brvcc->encaps == e_llc) ? "LLC" : "VC", | |
715 | (brdev->payload == p_bridged) ? "bridged" : "routed", | |
716 | brvcc->copies_failed, brvcc->copies_needed); | |
1da177e4 LT |
717 | #ifdef CONFIG_ATM_BR2684_IPFILTER |
718 | #define b1(var, byte) ((u8 *) &brvcc->filter.var)[byte] | |
719 | #define bs(var) b1(var, 0), b1(var, 1), b1(var, 2), b1(var, 3) | |
fb64c735 CW |
720 | if (brvcc->filter.netmask != 0) |
721 | seq_printf(seq, " filter=%d.%d.%d.%d/" | |
722 | "%d.%d.%d.%d\n", bs(prefix), bs(netmask)); | |
1da177e4 LT |
723 | #undef bs |
724 | #undef b1 | |
725 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ | |
726 | } | |
727 | return 0; | |
728 | } | |
729 | ||
56b3d975 | 730 | static const struct seq_operations br2684_seq_ops = { |
1da177e4 | 731 | .start = br2684_seq_start, |
fb64c735 CW |
732 | .next = br2684_seq_next, |
733 | .stop = br2684_seq_stop, | |
734 | .show = br2684_seq_show, | |
1da177e4 LT |
735 | }; |
736 | ||
737 | static int br2684_proc_open(struct inode *inode, struct file *file) | |
738 | { | |
739 | return seq_open(file, &br2684_seq_ops); | |
740 | } | |
741 | ||
9a32144e | 742 | static const struct file_operations br2684_proc_ops = { |
fb64c735 CW |
743 | .owner = THIS_MODULE, |
744 | .open = br2684_proc_open, | |
745 | .read = seq_read, | |
746 | .llseek = seq_lseek, | |
1da177e4 LT |
747 | .release = seq_release, |
748 | }; | |
749 | ||
750 | extern struct proc_dir_entry *atm_proc_root; /* from proc.c */ | |
fb64c735 | 751 | #endif /* CONFIG_PROC_FS */ |
1da177e4 LT |
752 | |
753 | static int __init br2684_init(void) | |
754 | { | |
755 | #ifdef CONFIG_PROC_FS | |
756 | struct proc_dir_entry *p; | |
16e297b3 WC |
757 | p = proc_create("br2684", 0, atm_proc_root, &br2684_proc_ops); |
758 | if (p == NULL) | |
1da177e4 | 759 | return -ENOMEM; |
1da177e4 LT |
760 | #endif |
761 | register_atm_ioctl(&br2684_ioctl_ops); | |
762 | return 0; | |
763 | } | |
764 | ||
765 | static void __exit br2684_exit(void) | |
766 | { | |
767 | struct net_device *net_dev; | |
768 | struct br2684_dev *brdev; | |
769 | struct br2684_vcc *brvcc; | |
770 | deregister_atm_ioctl(&br2684_ioctl_ops); | |
771 | ||
772 | #ifdef CONFIG_PROC_FS | |
773 | remove_proc_entry("br2684", atm_proc_root); | |
774 | #endif | |
775 | ||
776 | while (!list_empty(&br2684_devs)) { | |
777 | net_dev = list_entry_brdev(br2684_devs.next); | |
778 | brdev = BRPRIV(net_dev); | |
779 | while (!list_empty(&brdev->brvccs)) { | |
780 | brvcc = list_entry_brvcc(brdev->brvccs.next); | |
781 | br2684_close_vcc(brvcc); | |
782 | } | |
783 | ||
784 | list_del(&brdev->br2684_devs); | |
785 | unregister_netdev(net_dev); | |
5f6b1ea4 | 786 | free_netdev(net_dev); |
1da177e4 LT |
787 | } |
788 | } | |
789 | ||
790 | module_init(br2684_init); | |
791 | module_exit(br2684_exit); | |
792 | ||
793 | MODULE_AUTHOR("Marcell GAL"); | |
794 | MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5"); | |
795 | MODULE_LICENSE("GPL"); |