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