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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 | ||
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); | |
137742cf | 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 | 86 | int mac_was_set; |
097b19a9 | 87 | enum br2684_payload payload; |
1da177e4 LT |
88 | }; |
89 | ||
90 | /* | |
91 | * This lock should be held for writing any time the list of devices or | |
92 | * their attached vcc's could be altered. It should be held for reading | |
93 | * any time these are being queried. Note that we sometimes need to | |
94 | * do read-locking under interrupt context, so write locking must block | |
95 | * the current CPU's interrupts | |
96 | */ | |
97 | static DEFINE_RWLOCK(devs_lock); | |
98 | ||
99 | static LIST_HEAD(br2684_devs); | |
100 | ||
101 | static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev) | |
102 | { | |
524ad0a7 | 103 | return (struct br2684_dev *)netdev_priv(net_dev); |
1da177e4 LT |
104 | } |
105 | ||
106 | static inline struct net_device *list_entry_brdev(const struct list_head *le) | |
107 | { | |
108 | return list_entry(le, struct br2684_dev, br2684_devs)->net_dev; | |
109 | } | |
110 | ||
111 | static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc) | |
112 | { | |
fb64c735 | 113 | return (struct br2684_vcc *)(atmvcc->user_back); |
1da177e4 LT |
114 | } |
115 | ||
116 | static inline struct br2684_vcc *list_entry_brvcc(const struct list_head *le) | |
117 | { | |
118 | return list_entry(le, struct br2684_vcc, brvccs); | |
119 | } | |
120 | ||
121 | /* Caller should hold read_lock(&devs_lock) */ | |
122 | static struct net_device *br2684_find_dev(const struct br2684_if_spec *s) | |
123 | { | |
124 | struct list_head *lh; | |
125 | struct net_device *net_dev; | |
126 | switch (s->method) { | |
127 | case BR2684_FIND_BYNUM: | |
128 | list_for_each(lh, &br2684_devs) { | |
129 | net_dev = list_entry_brdev(lh); | |
130 | if (BRPRIV(net_dev)->number == s->spec.devnum) | |
131 | return net_dev; | |
132 | } | |
133 | break; | |
134 | case BR2684_FIND_BYIFNAME: | |
135 | list_for_each(lh, &br2684_devs) { | |
136 | net_dev = list_entry_brdev(lh); | |
137 | if (!strncmp(net_dev->name, s->spec.ifname, IFNAMSIZ)) | |
138 | return net_dev; | |
139 | } | |
140 | break; | |
141 | } | |
142 | return NULL; | |
143 | } | |
144 | ||
137742cf KH |
145 | /* chained vcc->pop function. Check if we should wake the netif_queue */ |
146 | static void br2684_pop(struct atm_vcc *vcc, struct sk_buff *skb) | |
147 | { | |
148 | struct br2684_vcc *brvcc = BR2684_VCC(vcc); | |
149 | struct net_device *net_dev = skb->dev; | |
150 | ||
151 | pr_debug("br2684_pop(vcc %p ; net_dev %p )\n", vcc, net_dev); | |
152 | brvcc->old_pop(vcc, skb); | |
153 | ||
154 | if (!net_dev) | |
155 | return; | |
156 | ||
157 | if (atm_may_send(vcc, 0)) | |
158 | netif_wake_queue(net_dev); | |
159 | ||
160 | } | |
1da177e4 LT |
161 | /* |
162 | * Send a packet out a particular vcc. Not to useful right now, but paves | |
163 | * the way for multiple vcc's per itf. Returns true if we can send, | |
164 | * otherwise false | |
165 | */ | |
410e9d8f | 166 | static int br2684_xmit_vcc(struct sk_buff *skb, struct net_device *dev, |
fb64c735 | 167 | struct br2684_vcc *brvcc) |
1da177e4 | 168 | { |
410e9d8f | 169 | struct br2684_dev *brdev = BRPRIV(dev); |
1da177e4 | 170 | struct atm_vcc *atmvcc; |
1da177e4 | 171 | int minheadroom = (brvcc->encaps == e_llc) ? 10 : 2; |
097b19a9 | 172 | |
1da177e4 LT |
173 | if (skb_headroom(skb) < minheadroom) { |
174 | struct sk_buff *skb2 = skb_realloc_headroom(skb, minheadroom); | |
175 | brvcc->copies_needed++; | |
176 | dev_kfree_skb(skb); | |
177 | if (skb2 == NULL) { | |
178 | brvcc->copies_failed++; | |
179 | return 0; | |
180 | } | |
181 | skb = skb2; | |
182 | } | |
097b19a9 EK |
183 | |
184 | if (brvcc->encaps == e_llc) { | |
185 | if (brdev->payload == p_bridged) { | |
186 | skb_push(skb, sizeof(llc_oui_pid_pad)); | |
fb64c735 CW |
187 | skb_copy_to_linear_data(skb, llc_oui_pid_pad, |
188 | sizeof(llc_oui_pid_pad)); | |
097b19a9 EK |
189 | } else if (brdev->payload == p_routed) { |
190 | unsigned short prot = ntohs(skb->protocol); | |
191 | ||
192 | skb_push(skb, sizeof(llc_oui_ipv4)); | |
193 | switch (prot) { | |
fb64c735 CW |
194 | case ETH_P_IP: |
195 | skb_copy_to_linear_data(skb, llc_oui_ipv4, | |
196 | sizeof(llc_oui_ipv4)); | |
197 | break; | |
198 | case ETH_P_IPV6: | |
199 | skb_copy_to_linear_data(skb, llc_oui_ipv6, | |
200 | sizeof(llc_oui_ipv6)); | |
201 | break; | |
202 | default: | |
203 | dev_kfree_skb(skb); | |
204 | return 0; | |
097b19a9 EK |
205 | } |
206 | } | |
7e903c2a EK |
207 | } else { /* e_vc */ |
208 | if (brdev->payload == p_bridged) { | |
209 | skb_push(skb, 2); | |
097b19a9 | 210 | memset(skb->data, 0, 2); |
7e903c2a EK |
211 | } else { /* p_routed */ |
212 | skb_pull(skb, ETH_HLEN); | |
213 | } | |
097b19a9 | 214 | } |
1da177e4 LT |
215 | skb_debug(skb); |
216 | ||
217 | ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc; | |
52240062 | 218 | pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev); |
1da177e4 LT |
219 | atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc); |
220 | ATM_SKB(skb)->atm_options = atmvcc->atm_options; | |
410e9d8f SH |
221 | dev->stats.tx_packets++; |
222 | dev->stats.tx_bytes += skb->len; | |
1da177e4 | 223 | atmvcc->send(atmvcc, skb); |
137742cf KH |
224 | |
225 | if (!atm_may_send(atmvcc, 0)) { | |
226 | netif_stop_queue(brvcc->device); | |
227 | /*check for race with br2684_pop*/ | |
228 | if (atm_may_send(atmvcc, 0)) | |
229 | netif_start_queue(brvcc->device); | |
230 | } | |
231 | ||
1da177e4 LT |
232 | return 1; |
233 | } | |
234 | ||
61c33e01 MBJ |
235 | static inline struct br2684_vcc *pick_outgoing_vcc(const struct sk_buff *skb, |
236 | const struct br2684_dev *brdev) | |
1da177e4 | 237 | { |
fb64c735 | 238 | return list_empty(&brdev->brvccs) ? NULL : list_entry_brvcc(brdev->brvccs.next); /* 1 vcc/dev right now */ |
1da177e4 LT |
239 | } |
240 | ||
3c805a22 SH |
241 | static netdev_tx_t br2684_start_xmit(struct sk_buff *skb, |
242 | struct net_device *dev) | |
1da177e4 LT |
243 | { |
244 | struct br2684_dev *brdev = BRPRIV(dev); | |
245 | struct br2684_vcc *brvcc; | |
246 | ||
adf30907 | 247 | pr_debug("br2684_start_xmit, skb_dst(skb)=%p\n", skb_dst(skb)); |
1da177e4 LT |
248 | read_lock(&devs_lock); |
249 | brvcc = pick_outgoing_vcc(skb, brdev); | |
250 | if (brvcc == NULL) { | |
52240062 | 251 | pr_debug("no vcc attached to dev %s\n", dev->name); |
410e9d8f SH |
252 | dev->stats.tx_errors++; |
253 | dev->stats.tx_carrier_errors++; | |
1da177e4 LT |
254 | /* netif_stop_queue(dev); */ |
255 | dev_kfree_skb(skb); | |
256 | read_unlock(&devs_lock); | |
6ed10654 | 257 | return NETDEV_TX_OK; |
1da177e4 | 258 | } |
410e9d8f | 259 | if (!br2684_xmit_vcc(skb, dev, brvcc)) { |
1da177e4 LT |
260 | /* |
261 | * We should probably use netif_*_queue() here, but that | |
262 | * involves added complication. We need to walk before | |
fb64c735 CW |
263 | * we can run. |
264 | * | |
265 | * Don't free here! this pointer might be no longer valid! | |
1da177e4 | 266 | */ |
410e9d8f SH |
267 | dev->stats.tx_errors++; |
268 | dev->stats.tx_fifo_errors++; | |
1da177e4 LT |
269 | } |
270 | read_unlock(&devs_lock); | |
6ed10654 | 271 | return NETDEV_TX_OK; |
1da177e4 LT |
272 | } |
273 | ||
1da177e4 LT |
274 | /* |
275 | * We remember when the MAC gets set, so we don't override it later with | |
276 | * the ESI of the ATM card of the first VC | |
277 | */ | |
1da177e4 LT |
278 | static int br2684_mac_addr(struct net_device *dev, void *p) |
279 | { | |
0ba25ff4 | 280 | int err = eth_mac_addr(dev, p); |
1da177e4 LT |
281 | if (!err) |
282 | BRPRIV(dev)->mac_was_set = 1; | |
283 | return err; | |
284 | } | |
285 | ||
286 | #ifdef CONFIG_ATM_BR2684_IPFILTER | |
287 | /* this IOCTL is experimental. */ | |
fb64c735 | 288 | static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg) |
1da177e4 LT |
289 | { |
290 | struct br2684_vcc *brvcc; | |
291 | struct br2684_filter_set fs; | |
292 | ||
293 | if (copy_from_user(&fs, arg, sizeof fs)) | |
294 | return -EFAULT; | |
295 | if (fs.ifspec.method != BR2684_FIND_BYNOTHING) { | |
296 | /* | |
297 | * This is really a per-vcc thing, but we can also search | |
fb64c735 | 298 | * by device. |
1da177e4 LT |
299 | */ |
300 | struct br2684_dev *brdev; | |
301 | read_lock(&devs_lock); | |
302 | brdev = BRPRIV(br2684_find_dev(&fs.ifspec)); | |
fb64c735 | 303 | if (brdev == NULL || list_empty(&brdev->brvccs) || brdev->brvccs.next != brdev->brvccs.prev) /* >1 VCC */ |
1da177e4 LT |
304 | brvcc = NULL; |
305 | else | |
306 | brvcc = list_entry_brvcc(brdev->brvccs.next); | |
307 | read_unlock(&devs_lock); | |
308 | if (brvcc == NULL) | |
309 | return -ESRCH; | |
310 | } else | |
311 | brvcc = BR2684_VCC(atmvcc); | |
312 | memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter)); | |
313 | return 0; | |
314 | } | |
315 | ||
316 | /* Returns 1 if packet should be dropped */ | |
317 | static inline int | |
30d492da | 318 | packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb) |
1da177e4 LT |
319 | { |
320 | if (brvcc->filter.netmask == 0) | |
fb64c735 | 321 | return 0; /* no filter in place */ |
acde4855 | 322 | if (type == htons(ETH_P_IP) && |
fb64c735 | 323 | (((struct iphdr *)(skb->data))->daddr & brvcc->filter. |
1da177e4 LT |
324 | netmask) == brvcc->filter.prefix) |
325 | return 0; | |
acde4855 | 326 | if (type == htons(ETH_P_ARP)) |
1da177e4 | 327 | return 0; |
fb64c735 CW |
328 | /* |
329 | * TODO: we should probably filter ARPs too.. don't want to have | |
330 | * them returning values that don't make sense, or is that ok? | |
1da177e4 LT |
331 | */ |
332 | return 1; /* drop */ | |
333 | } | |
334 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ | |
335 | ||
336 | static void br2684_close_vcc(struct br2684_vcc *brvcc) | |
337 | { | |
52240062 | 338 | pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device); |
1da177e4 LT |
339 | write_lock_irq(&devs_lock); |
340 | list_del(&brvcc->brvccs); | |
341 | write_unlock_irq(&devs_lock); | |
342 | brvcc->atmvcc->user_back = NULL; /* what about vcc->recvq ??? */ | |
343 | brvcc->old_push(brvcc->atmvcc, NULL); /* pass on the bad news */ | |
344 | kfree(brvcc); | |
345 | module_put(THIS_MODULE); | |
346 | } | |
347 | ||
348 | /* when AAL5 PDU comes in: */ | |
349 | static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb) | |
350 | { | |
351 | struct br2684_vcc *brvcc = BR2684_VCC(atmvcc); | |
352 | struct net_device *net_dev = brvcc->device; | |
353 | struct br2684_dev *brdev = BRPRIV(net_dev); | |
1da177e4 | 354 | |
52240062 | 355 | pr_debug("br2684_push\n"); |
1da177e4 LT |
356 | |
357 | if (unlikely(skb == NULL)) { | |
358 | /* skb==NULL means VCC is being destroyed */ | |
359 | br2684_close_vcc(brvcc); | |
360 | if (list_empty(&brdev->brvccs)) { | |
1e0ba006 | 361 | write_lock_irq(&devs_lock); |
1da177e4 | 362 | list_del(&brdev->br2684_devs); |
1e0ba006 | 363 | write_unlock_irq(&devs_lock); |
1da177e4 | 364 | unregister_netdev(net_dev); |
5f6b1ea4 | 365 | free_netdev(net_dev); |
1da177e4 LT |
366 | } |
367 | return; | |
368 | } | |
369 | ||
370 | skb_debug(skb); | |
371 | atm_return(atmvcc, skb->truesize); | |
52240062 | 372 | pr_debug("skb from brdev %p\n", brdev); |
1da177e4 | 373 | if (brvcc->encaps == e_llc) { |
097b19a9 EK |
374 | |
375 | if (skb->len > 7 && skb->data[7] == 0x01) | |
376 | __skb_trim(skb, skb->len - 4); | |
377 | ||
378 | /* accept packets that have "ipv[46]" in the snap header */ | |
379 | if ((skb->len >= (sizeof(llc_oui_ipv4))) | |
fb64c735 CW |
380 | && |
381 | (memcmp | |
382 | (skb->data, llc_oui_ipv4, | |
383 | sizeof(llc_oui_ipv4) - BR2684_ETHERTYPE_LEN) == 0)) { | |
384 | if (memcmp | |
385 | (skb->data + 6, ethertype_ipv6, | |
386 | sizeof(ethertype_ipv6)) == 0) | |
60678040 | 387 | skb->protocol = htons(ETH_P_IPV6); |
fb64c735 CW |
388 | else if (memcmp |
389 | (skb->data + 6, ethertype_ipv4, | |
390 | sizeof(ethertype_ipv4)) == 0) | |
60678040 | 391 | skb->protocol = htons(ETH_P_IP); |
7e903c2a EK |
392 | else |
393 | goto error; | |
097b19a9 EK |
394 | skb_pull(skb, sizeof(llc_oui_ipv4)); |
395 | skb_reset_network_header(skb); | |
396 | skb->pkt_type = PACKET_HOST; | |
fb64c735 CW |
397 | /* |
398 | * Let us waste some time for checking the encapsulation. | |
399 | * Note, that only 7 char is checked so frames with a valid FCS | |
400 | * are also accepted (but FCS is not checked of course). | |
401 | */ | |
097b19a9 | 402 | } else if ((skb->len >= sizeof(llc_oui_pid_pad)) && |
fb64c735 | 403 | (memcmp(skb->data, llc_oui_pid_pad, 7) == 0)) { |
097b19a9 EK |
404 | skb_pull(skb, sizeof(llc_oui_pid_pad)); |
405 | skb->protocol = eth_type_trans(skb, net_dev); | |
7e903c2a EK |
406 | } else |
407 | goto error; | |
1da177e4 | 408 | |
7e903c2a EK |
409 | } else { /* e_vc */ |
410 | if (brdev->payload == p_routed) { | |
411 | struct iphdr *iph; | |
412 | ||
413 | skb_reset_network_header(skb); | |
414 | iph = ip_hdr(skb); | |
415 | if (iph->version == 4) | |
60678040 | 416 | skb->protocol = htons(ETH_P_IP); |
7e903c2a | 417 | else if (iph->version == 6) |
60678040 | 418 | skb->protocol = htons(ETH_P_IPV6); |
7e903c2a EK |
419 | else |
420 | goto error; | |
421 | skb->pkt_type = PACKET_HOST; | |
422 | } else { /* p_bridged */ | |
423 | /* first 2 chars should be 0 */ | |
424 | if (*((u16 *) (skb->data)) != 0) | |
425 | goto error; | |
426 | skb_pull(skb, BR2684_PAD_LEN); | |
427 | skb->protocol = eth_type_trans(skb, net_dev); | |
1da177e4 | 428 | } |
1da177e4 LT |
429 | } |
430 | ||
1da177e4 | 431 | #ifdef CONFIG_ATM_BR2684_IPFILTER |
7e903c2a EK |
432 | if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb))) |
433 | goto dropped; | |
1da177e4 LT |
434 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ |
435 | skb->dev = net_dev; | |
436 | ATM_SKB(skb)->vcc = atmvcc; /* needed ? */ | |
52240062 | 437 | pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol)); |
1da177e4 | 438 | skb_debug(skb); |
7e903c2a EK |
439 | /* sigh, interface is down? */ |
440 | if (unlikely(!(net_dev->flags & IFF_UP))) | |
441 | goto dropped; | |
410e9d8f SH |
442 | net_dev->stats.rx_packets++; |
443 | net_dev->stats.rx_bytes += skb->len; | |
1da177e4 LT |
444 | memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); |
445 | netif_rx(skb); | |
7e903c2a EK |
446 | return; |
447 | ||
448 | dropped: | |
410e9d8f | 449 | net_dev->stats.rx_dropped++; |
7e903c2a EK |
450 | goto free_skb; |
451 | error: | |
410e9d8f | 452 | net_dev->stats.rx_errors++; |
7e903c2a EK |
453 | free_skb: |
454 | dev_kfree_skb(skb); | |
455 | return; | |
1da177e4 LT |
456 | } |
457 | ||
fb64c735 CW |
458 | /* |
459 | * Assign a vcc to a dev | |
460 | * Note: we do not have explicit unassign, but look at _push() | |
461 | */ | |
462 | static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg) | |
1da177e4 | 463 | { |
b6211ae7 | 464 | struct sk_buff_head queue; |
1da177e4 LT |
465 | int err; |
466 | struct br2684_vcc *brvcc; | |
b6211ae7 | 467 | struct sk_buff *skb, *tmp; |
c40a27f4 | 468 | struct sk_buff_head *rq; |
1da177e4 LT |
469 | struct br2684_dev *brdev; |
470 | struct net_device *net_dev; | |
471 | struct atm_backend_br2684 be; | |
c40a27f4 | 472 | unsigned long flags; |
1da177e4 LT |
473 | |
474 | if (copy_from_user(&be, arg, sizeof be)) | |
475 | return -EFAULT; | |
0da974f4 | 476 | brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL); |
1da177e4 LT |
477 | if (!brvcc) |
478 | return -ENOMEM; | |
1da177e4 LT |
479 | write_lock_irq(&devs_lock); |
480 | net_dev = br2684_find_dev(&be.ifspec); | |
481 | if (net_dev == NULL) { | |
482 | printk(KERN_ERR | |
fb64c735 | 483 | "br2684: tried to attach to non-existant device\n"); |
1da177e4 LT |
484 | err = -ENXIO; |
485 | goto error; | |
486 | } | |
487 | brdev = BRPRIV(net_dev); | |
488 | if (atmvcc->push == NULL) { | |
489 | err = -EBADFD; | |
490 | goto error; | |
491 | } | |
492 | if (!list_empty(&brdev->brvccs)) { | |
493 | /* Only 1 VCC/dev right now */ | |
494 | err = -EEXIST; | |
495 | goto error; | |
496 | } | |
497 | if (be.fcs_in != BR2684_FCSIN_NO || be.fcs_out != BR2684_FCSOUT_NO || | |
498 | be.fcs_auto || be.has_vpiid || be.send_padding || (be.encaps != | |
fb64c735 CW |
499 | BR2684_ENCAPS_VC |
500 | && be.encaps != | |
501 | BR2684_ENCAPS_LLC) | |
502 | || be.min_size != 0) { | |
1da177e4 LT |
503 | err = -EINVAL; |
504 | goto error; | |
505 | } | |
fb64c735 CW |
506 | pr_debug("br2684_regvcc vcc=%p, encaps=%d, brvcc=%p\n", atmvcc, |
507 | be.encaps, brvcc); | |
1da177e4 LT |
508 | if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) { |
509 | unsigned char *esi = atmvcc->dev->esi; | |
510 | if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5]) | |
511 | memcpy(net_dev->dev_addr, esi, net_dev->addr_len); | |
512 | else | |
513 | net_dev->dev_addr[2] = 1; | |
514 | } | |
515 | list_add(&brvcc->brvccs, &brdev->brvccs); | |
516 | write_unlock_irq(&devs_lock); | |
517 | brvcc->device = net_dev; | |
518 | brvcc->atmvcc = atmvcc; | |
519 | atmvcc->user_back = brvcc; | |
fb64c735 | 520 | brvcc->encaps = (enum br2684_encaps)be.encaps; |
1da177e4 | 521 | brvcc->old_push = atmvcc->push; |
137742cf | 522 | brvcc->old_pop = atmvcc->pop; |
1da177e4 LT |
523 | barrier(); |
524 | atmvcc->push = br2684_push; | |
137742cf | 525 | atmvcc->pop = br2684_pop; |
c40a27f4 | 526 | |
b6211ae7 | 527 | __skb_queue_head_init(&queue); |
c40a27f4 DM |
528 | rq = &sk_atm(atmvcc)->sk_receive_queue; |
529 | ||
530 | spin_lock_irqsave(&rq->lock, flags); | |
b6211ae7 | 531 | skb_queue_splice_init(rq, &queue); |
c40a27f4 DM |
532 | spin_unlock_irqrestore(&rq->lock, flags); |
533 | ||
b6211ae7 DM |
534 | skb_queue_walk_safe(&queue, skb, tmp) { |
535 | struct net_device *dev = skb->dev; | |
c40a27f4 | 536 | |
b6211ae7 DM |
537 | dev->stats.rx_bytes -= skb->len; |
538 | dev->stats.rx_packets--; | |
c40a27f4 | 539 | |
b6211ae7 | 540 | br2684_push(atmvcc, skb); |
1da177e4 LT |
541 | } |
542 | __module_get(THIS_MODULE); | |
543 | return 0; | |
fb64c735 | 544 | error: |
1da177e4 LT |
545 | write_unlock_irq(&devs_lock); |
546 | kfree(brvcc); | |
547 | return err; | |
548 | } | |
549 | ||
0ba25ff4 SH |
550 | static const struct net_device_ops br2684_netdev_ops = { |
551 | .ndo_start_xmit = br2684_start_xmit, | |
552 | .ndo_set_mac_address = br2684_mac_addr, | |
553 | .ndo_change_mtu = eth_change_mtu, | |
554 | .ndo_validate_addr = eth_validate_addr, | |
555 | }; | |
556 | ||
1da177e4 LT |
557 | static void br2684_setup(struct net_device *netdev) |
558 | { | |
559 | struct br2684_dev *brdev = BRPRIV(netdev); | |
560 | ||
561 | ether_setup(netdev); | |
902e5ea1 | 562 | brdev->net_dev = netdev; |
1da177e4 | 563 | |
0ba25ff4 | 564 | netdev->netdev_ops = &br2684_netdev_ops; |
1da177e4 LT |
565 | |
566 | INIT_LIST_HEAD(&brdev->brvccs); | |
567 | } | |
568 | ||
097b19a9 EK |
569 | static void br2684_setup_routed(struct net_device *netdev) |
570 | { | |
571 | struct br2684_dev *brdev = BRPRIV(netdev); | |
572 | brdev->net_dev = netdev; | |
573 | ||
574 | netdev->hard_header_len = 0; | |
0ba25ff4 SH |
575 | |
576 | netdev->netdev_ops = &br2684_netdev_ops; | |
097b19a9 EK |
577 | netdev->addr_len = 0; |
578 | netdev->mtu = 1500; | |
579 | netdev->type = ARPHRD_PPP; | |
580 | netdev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; | |
581 | netdev->tx_queue_len = 100; | |
582 | INIT_LIST_HEAD(&brdev->brvccs); | |
583 | } | |
584 | ||
fb64c735 | 585 | static int br2684_create(void __user * arg) |
1da177e4 LT |
586 | { |
587 | int err; | |
588 | struct net_device *netdev; | |
589 | struct br2684_dev *brdev; | |
590 | struct atm_newif_br2684 ni; | |
097b19a9 | 591 | enum br2684_payload payload; |
1da177e4 | 592 | |
52240062 | 593 | pr_debug("br2684_create\n"); |
1da177e4 LT |
594 | |
595 | if (copy_from_user(&ni, arg, sizeof ni)) { | |
596 | return -EFAULT; | |
597 | } | |
097b19a9 EK |
598 | |
599 | if (ni.media & BR2684_FLAG_ROUTED) | |
600 | payload = p_routed; | |
601 | else | |
602 | payload = p_bridged; | |
fb64c735 | 603 | ni.media &= 0xffff; /* strip flags */ |
097b19a9 | 604 | |
1da177e4 LT |
605 | if (ni.media != BR2684_MEDIA_ETHERNET || ni.mtu != 1500) { |
606 | return -EINVAL; | |
607 | } | |
608 | ||
609 | netdev = alloc_netdev(sizeof(struct br2684_dev), | |
610 | ni.ifname[0] ? ni.ifname : "nas%d", | |
097b19a9 | 611 | (payload == p_routed) ? |
fb64c735 | 612 | br2684_setup_routed : br2684_setup); |
1da177e4 LT |
613 | if (!netdev) |
614 | return -ENOMEM; | |
615 | ||
616 | brdev = BRPRIV(netdev); | |
617 | ||
52240062 | 618 | pr_debug("registered netdev %s\n", netdev->name); |
1da177e4 LT |
619 | /* open, stop, do_ioctl ? */ |
620 | err = register_netdev(netdev); | |
621 | if (err < 0) { | |
622 | printk(KERN_ERR "br2684_create: register_netdev failed\n"); | |
623 | free_netdev(netdev); | |
624 | return err; | |
625 | } | |
626 | ||
627 | write_lock_irq(&devs_lock); | |
097b19a9 | 628 | brdev->payload = payload; |
1da177e4 LT |
629 | brdev->number = list_empty(&br2684_devs) ? 1 : |
630 | BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1; | |
631 | list_add_tail(&brdev->br2684_devs, &br2684_devs); | |
632 | write_unlock_irq(&devs_lock); | |
633 | return 0; | |
634 | } | |
635 | ||
636 | /* | |
637 | * This handles ioctls actually performed on our vcc - we must return | |
638 | * -ENOIOCTLCMD for any unrecognized ioctl | |
639 | */ | |
640 | static int br2684_ioctl(struct socket *sock, unsigned int cmd, | |
fb64c735 | 641 | unsigned long arg) |
1da177e4 LT |
642 | { |
643 | struct atm_vcc *atmvcc = ATM_SD(sock); | |
644 | void __user *argp = (void __user *)arg; | |
fb64c735 | 645 | atm_backend_t b; |
1da177e4 LT |
646 | |
647 | int err; | |
fb64c735 | 648 | switch (cmd) { |
1da177e4 | 649 | case ATM_SETBACKEND: |
fb64c735 | 650 | case ATM_NEWBACKENDIF: |
1da177e4 LT |
651 | err = get_user(b, (atm_backend_t __user *) argp); |
652 | if (err) | |
653 | return -EFAULT; | |
654 | if (b != ATM_BACKEND_BR2684) | |
655 | return -ENOIOCTLCMD; | |
656 | if (!capable(CAP_NET_ADMIN)) | |
657 | return -EPERM; | |
658 | if (cmd == ATM_SETBACKEND) | |
659 | return br2684_regvcc(atmvcc, argp); | |
660 | else | |
661 | return br2684_create(argp); | |
1da177e4 LT |
662 | #ifdef CONFIG_ATM_BR2684_IPFILTER |
663 | case BR2684_SETFILT: | |
664 | if (atmvcc->push != br2684_push) | |
665 | return -ENOIOCTLCMD; | |
666 | if (!capable(CAP_NET_ADMIN)) | |
667 | return -EPERM; | |
668 | err = br2684_setfilt(atmvcc, argp); | |
fb64c735 | 669 | |
1da177e4 LT |
670 | return err; |
671 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ | |
672 | } | |
673 | return -ENOIOCTLCMD; | |
674 | } | |
675 | ||
676 | static struct atm_ioctl br2684_ioctl_ops = { | |
fb64c735 CW |
677 | .owner = THIS_MODULE, |
678 | .ioctl = br2684_ioctl, | |
1da177e4 LT |
679 | }; |
680 | ||
1da177e4 | 681 | #ifdef CONFIG_PROC_FS |
fb64c735 | 682 | static void *br2684_seq_start(struct seq_file *seq, loff_t * pos) |
5c17d5f1 | 683 | __acquires(devs_lock) |
1da177e4 | 684 | { |
1da177e4 | 685 | read_lock(&devs_lock); |
9af97186 | 686 | return seq_list_start(&br2684_devs, *pos); |
1da177e4 LT |
687 | } |
688 | ||
fb64c735 | 689 | static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t * pos) |
1da177e4 | 690 | { |
9af97186 | 691 | return seq_list_next(v, &br2684_devs, pos); |
1da177e4 LT |
692 | } |
693 | ||
694 | static void br2684_seq_stop(struct seq_file *seq, void *v) | |
5c17d5f1 | 695 | __releases(devs_lock) |
1da177e4 LT |
696 | { |
697 | read_unlock(&devs_lock); | |
698 | } | |
699 | ||
700 | static int br2684_seq_show(struct seq_file *seq, void *v) | |
701 | { | |
9af97186 | 702 | const struct br2684_dev *brdev = list_entry(v, struct br2684_dev, |
fb64c735 | 703 | br2684_devs); |
1da177e4 LT |
704 | const struct net_device *net_dev = brdev->net_dev; |
705 | const struct br2684_vcc *brvcc; | |
706 | ||
e174961c | 707 | seq_printf(seq, "dev %.16s: num=%d, mac=%pM (%s)\n", |
0795af57 JP |
708 | net_dev->name, |
709 | brdev->number, | |
e174961c | 710 | net_dev->dev_addr, |
0795af57 | 711 | brdev->mac_was_set ? "set" : "auto"); |
1da177e4 LT |
712 | |
713 | list_for_each_entry(brvcc, &brdev->brvccs, brvccs) { | |
097b19a9 | 714 | seq_printf(seq, " vcc %d.%d.%d: encaps=%s payload=%s" |
fb64c735 CW |
715 | ", failed copies %u/%u" |
716 | "\n", brvcc->atmvcc->dev->number, | |
717 | brvcc->atmvcc->vpi, brvcc->atmvcc->vci, | |
718 | (brvcc->encaps == e_llc) ? "LLC" : "VC", | |
719 | (brdev->payload == p_bridged) ? "bridged" : "routed", | |
720 | brvcc->copies_failed, brvcc->copies_needed); | |
1da177e4 LT |
721 | #ifdef CONFIG_ATM_BR2684_IPFILTER |
722 | #define b1(var, byte) ((u8 *) &brvcc->filter.var)[byte] | |
723 | #define bs(var) b1(var, 0), b1(var, 1), b1(var, 2), b1(var, 3) | |
fb64c735 CW |
724 | if (brvcc->filter.netmask != 0) |
725 | seq_printf(seq, " filter=%d.%d.%d.%d/" | |
726 | "%d.%d.%d.%d\n", bs(prefix), bs(netmask)); | |
1da177e4 LT |
727 | #undef bs |
728 | #undef b1 | |
729 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ | |
730 | } | |
731 | return 0; | |
732 | } | |
733 | ||
56b3d975 | 734 | static const struct seq_operations br2684_seq_ops = { |
1da177e4 | 735 | .start = br2684_seq_start, |
fb64c735 CW |
736 | .next = br2684_seq_next, |
737 | .stop = br2684_seq_stop, | |
738 | .show = br2684_seq_show, | |
1da177e4 LT |
739 | }; |
740 | ||
741 | static int br2684_proc_open(struct inode *inode, struct file *file) | |
742 | { | |
743 | return seq_open(file, &br2684_seq_ops); | |
744 | } | |
745 | ||
9a32144e | 746 | static const struct file_operations br2684_proc_ops = { |
fb64c735 CW |
747 | .owner = THIS_MODULE, |
748 | .open = br2684_proc_open, | |
749 | .read = seq_read, | |
750 | .llseek = seq_lseek, | |
1da177e4 LT |
751 | .release = seq_release, |
752 | }; | |
753 | ||
754 | extern struct proc_dir_entry *atm_proc_root; /* from proc.c */ | |
fb64c735 | 755 | #endif /* CONFIG_PROC_FS */ |
1da177e4 LT |
756 | |
757 | static int __init br2684_init(void) | |
758 | { | |
759 | #ifdef CONFIG_PROC_FS | |
760 | struct proc_dir_entry *p; | |
16e297b3 WC |
761 | p = proc_create("br2684", 0, atm_proc_root, &br2684_proc_ops); |
762 | if (p == NULL) | |
1da177e4 | 763 | return -ENOMEM; |
1da177e4 LT |
764 | #endif |
765 | register_atm_ioctl(&br2684_ioctl_ops); | |
766 | return 0; | |
767 | } | |
768 | ||
769 | static void __exit br2684_exit(void) | |
770 | { | |
771 | struct net_device *net_dev; | |
772 | struct br2684_dev *brdev; | |
773 | struct br2684_vcc *brvcc; | |
774 | deregister_atm_ioctl(&br2684_ioctl_ops); | |
775 | ||
776 | #ifdef CONFIG_PROC_FS | |
777 | remove_proc_entry("br2684", atm_proc_root); | |
778 | #endif | |
779 | ||
780 | while (!list_empty(&br2684_devs)) { | |
781 | net_dev = list_entry_brdev(br2684_devs.next); | |
782 | brdev = BRPRIV(net_dev); | |
783 | while (!list_empty(&brdev->brvccs)) { | |
784 | brvcc = list_entry_brvcc(brdev->brvccs.next); | |
785 | br2684_close_vcc(brvcc); | |
786 | } | |
787 | ||
788 | list_del(&brdev->br2684_devs); | |
789 | unregister_netdev(net_dev); | |
5f6b1ea4 | 790 | free_netdev(net_dev); |
1da177e4 LT |
791 | } |
792 | } | |
793 | ||
794 | module_init(br2684_init); | |
795 | module_exit(br2684_exit); | |
796 | ||
797 | MODULE_AUTHOR("Marcell GAL"); | |
798 | MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5"); | |
799 | MODULE_LICENSE("GPL"); |