blob: 13858e2675c5f57277f031eacece09724bc84cd3 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Chas Williamsfb64c732007-12-30 23:18:29 -08002 * 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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07008
9#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070010#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>
Randy Dunlap4fc268d2006-01-11 12:17:47 -080022#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/seq_file.h>
24
25#include <linux/atmbr2684.h>
26
27#include "common.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#ifdef SKB_DEBUG
30static 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
Eric Kinzie097b19a2007-12-30 23:17:53 -080044#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
Chas Williamsfb64c732007-12-30 23:18:29 -080055static unsigned char ethertype_ipv4[] = { ETHERTYPE_IPV4 };
56static unsigned char ethertype_ipv6[] = { ETHERTYPE_IPV6 };
Linus Torvalds1da177e2005-04-16 15:20:36 -070057static unsigned char llc_oui_pid_pad[] =
Chas Williamsfb64c732007-12-30 23:18:29 -080058 { LLC, SNAP_BRIDGED, PID_ETHERNET, PAD_BRIDGED };
59static unsigned char llc_oui_ipv4[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV4 };
60static unsigned char llc_oui_ipv6[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV6 };
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
62enum br2684_encaps {
Chas Williamsfb64c732007-12-30 23:18:29 -080063 e_vc = BR2684_ENCAPS_VC,
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 e_llc = BR2684_ENCAPS_LLC,
65};
66
67struct br2684_vcc {
Chas Williamsfb64c732007-12-30 23:18:29 -080068 struct atm_vcc *atmvcc;
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 struct net_device *device;
Chas Williamsfb64c732007-12-30 23:18:29 -080070 /* 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); */
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 unsigned copies_needed, copies_failed;
Linus Torvalds1da177e2005-04-16 15:20:36 -070079};
80
81struct br2684_dev {
82 struct net_device *net_dev;
83 struct list_head br2684_devs;
84 int number;
Chas Williamsfb64c732007-12-30 23:18:29 -080085 struct list_head brvccs; /* one device <=> one vcc (before xmas) */
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 struct net_device_stats stats;
87 int mac_was_set;
Eric Kinzie097b19a2007-12-30 23:17:53 -080088 enum br2684_payload payload;
Linus Torvalds1da177e2005-04-16 15:20:36 -070089};
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 */
98static DEFINE_RWLOCK(devs_lock);
99
100static LIST_HEAD(br2684_devs);
101
102static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev)
103{
Chas Williamsfb64c732007-12-30 23:18:29 -0800104 return (struct br2684_dev *)net_dev->priv;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105}
106
107static 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
112static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc)
113{
Chas Williamsfb64c732007-12-30 23:18:29 -0800114 return (struct br2684_vcc *)(atmvcc->user_back);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115}
116
117static 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) */
123static 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 */
151static int br2684_xmit_vcc(struct sk_buff *skb, struct br2684_dev *brdev,
Chas Williamsfb64c732007-12-30 23:18:29 -0800152 struct br2684_vcc *brvcc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153{
154 struct atm_vcc *atmvcc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 int minheadroom = (brvcc->encaps == e_llc) ? 10 : 2;
Eric Kinzie097b19a2007-12-30 23:17:53 -0800156
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 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 }
Eric Kinzie097b19a2007-12-30 23:17:53 -0800167
168 if (brvcc->encaps == e_llc) {
169 if (brdev->payload == p_bridged) {
170 skb_push(skb, sizeof(llc_oui_pid_pad));
Chas Williamsfb64c732007-12-30 23:18:29 -0800171 skb_copy_to_linear_data(skb, llc_oui_pid_pad,
172 sizeof(llc_oui_pid_pad));
Eric Kinzie097b19a2007-12-30 23:17:53 -0800173 } 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) {
Chas Williamsfb64c732007-12-30 23:18:29 -0800178 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;
Eric Kinzie097b19a2007-12-30 23:17:53 -0800189 }
190 }
191 } else {
192 skb_push(skb, 2);
193 if (brdev->payload == p_bridged)
194 memset(skb->data, 0, 2);
195 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 skb_debug(skb);
197
198 ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc;
Stephen Hemminger52240062007-08-28 15:22:09 -0700199 pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 if (!atm_may_send(atmvcc, skb->truesize)) {
Chas Williamsfb64c732007-12-30 23:18:29 -0800201 /*
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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 dev_kfree_skb(skb);
207 return 0;
Chas Williamsfb64c732007-12-30 23:18:29 -0800208 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 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
217static inline struct br2684_vcc *pick_outgoing_vcc(struct sk_buff *skb,
Chas Williamsfb64c732007-12-30 23:18:29 -0800218 struct br2684_dev *brdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219{
Chas Williamsfb64c732007-12-30 23:18:29 -0800220 return list_empty(&brdev->brvccs) ? NULL : list_entry_brvcc(brdev->brvccs.next); /* 1 vcc/dev right now */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221}
222
223static 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
Stephen Hemminger52240062007-08-28 15:22:09 -0700228 pr_debug("br2684_start_xmit, skb->dst=%p\n", skb->dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 read_lock(&devs_lock);
230 brvcc = pick_outgoing_vcc(skb, brdev);
231 if (brvcc == NULL) {
Stephen Hemminger52240062007-08-28 15:22:09 -0700232 pr_debug("no vcc attached to dev %s\n", dev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 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);
Jean-Denis Boyer4f55cd12005-10-07 13:44:35 -0700238 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 }
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
Chas Williamsfb64c732007-12-30 23:18:29 -0800244 * we can run.
245 *
246 * Don't free here! this pointer might be no longer valid!
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 brdev->stats.tx_errors++;
249 brdev->stats.tx_fifo_errors++;
250 }
251 read_unlock(&devs_lock);
252 return 0;
253}
254
255static struct net_device_stats *br2684_get_stats(struct net_device *dev)
256{
Stephen Hemminger52240062007-08-28 15:22:09 -0700257 pr_debug("br2684_get_stats\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 return &BRPRIV(dev)->stats;
259}
260
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261/*
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 */
Chas Williamsfb64c732007-12-30 23:18:29 -0800265static int (*my_eth_mac_addr) (struct net_device *, void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266static 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. */
Chas Williamsfb64c732007-12-30 23:18:29 -0800276static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277{
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
Chas Williamsfb64c732007-12-30 23:18:29 -0800286 * by device.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 */
288 struct br2684_dev *brdev;
289 read_lock(&devs_lock);
290 brdev = BRPRIV(br2684_find_dev(&fs.ifspec));
Chas Williamsfb64c732007-12-30 23:18:29 -0800291 if (brdev == NULL || list_empty(&brdev->brvccs) || brdev->brvccs.next != brdev->brvccs.prev) /* >1 VCC */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 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 */
305static inline int
Al Viro30d492d2006-11-14 21:11:29 -0800306packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307{
308 if (brvcc->filter.netmask == 0)
Chas Williamsfb64c732007-12-30 23:18:29 -0800309 return 0; /* no filter in place */
YOSHIFUJI Hideakiacde4852007-03-25 20:12:32 -0700310 if (type == htons(ETH_P_IP) &&
Chas Williamsfb64c732007-12-30 23:18:29 -0800311 (((struct iphdr *)(skb->data))->daddr & brvcc->filter.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 netmask) == brvcc->filter.prefix)
313 return 0;
YOSHIFUJI Hideakiacde4852007-03-25 20:12:32 -0700314 if (type == htons(ETH_P_ARP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 return 0;
Chas Williamsfb64c732007-12-30 23:18:29 -0800316 /*
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?
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 */
320 return 1; /* drop */
321}
322#endif /* CONFIG_ATM_BR2684_IPFILTER */
323
324static void br2684_close_vcc(struct br2684_vcc *brvcc)
325{
Stephen Hemminger52240062007-08-28 15:22:09 -0700326 pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 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: */
337static 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342
Stephen Hemminger52240062007-08-28 15:22:09 -0700343 pr_debug("br2684_push\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344
345 if (unlikely(skb == NULL)) {
346 /* skb==NULL means VCC is being destroyed */
347 br2684_close_vcc(brvcc);
348 if (list_empty(&brdev->brvccs)) {
Pavel Emelyanov1e0ba002008-05-04 18:00:36 -0700349 write_lock_irq(&devs_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 list_del(&brdev->br2684_devs);
Pavel Emelyanov1e0ba002008-05-04 18:00:36 -0700351 write_unlock_irq(&devs_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 unregister_netdev(net_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 }
354 return;
355 }
356
357 skb_debug(skb);
358 atm_return(atmvcc, skb->truesize);
Stephen Hemminger52240062007-08-28 15:22:09 -0700359 pr_debug("skb from brdev %p\n", brdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 if (brvcc->encaps == e_llc) {
Eric Kinzie097b19a2007-12-30 23:17:53 -0800361
362 if (skb->len > 7 && skb->data[7] == 0x01)
363 __skb_trim(skb, skb->len - 4);
364
365 /* accept packets that have "ipv[46]" in the snap header */
366 if ((skb->len >= (sizeof(llc_oui_ipv4)))
Chas Williamsfb64c732007-12-30 23:18:29 -0800367 &&
368 (memcmp
369 (skb->data, llc_oui_ipv4,
370 sizeof(llc_oui_ipv4) - BR2684_ETHERTYPE_LEN) == 0)) {
371 if (memcmp
372 (skb->data + 6, ethertype_ipv6,
373 sizeof(ethertype_ipv6)) == 0)
Eric Kinzie097b19a2007-12-30 23:17:53 -0800374 skb->protocol = __constant_htons(ETH_P_IPV6);
Chas Williamsfb64c732007-12-30 23:18:29 -0800375 else if (memcmp
376 (skb->data + 6, ethertype_ipv4,
377 sizeof(ethertype_ipv4)) == 0)
Eric Kinzie097b19a2007-12-30 23:17:53 -0800378 skb->protocol = __constant_htons(ETH_P_IP);
379 else {
380 brdev->stats.rx_errors++;
381 dev_kfree_skb(skb);
382 return;
383 }
384 skb_pull(skb, sizeof(llc_oui_ipv4));
385 skb_reset_network_header(skb);
386 skb->pkt_type = PACKET_HOST;
Chas Williamsfb64c732007-12-30 23:18:29 -0800387 /*
388 * Let us waste some time for checking the encapsulation.
389 * Note, that only 7 char is checked so frames with a valid FCS
390 * are also accepted (but FCS is not checked of course).
391 */
Eric Kinzie097b19a2007-12-30 23:17:53 -0800392 } else if ((skb->len >= sizeof(llc_oui_pid_pad)) &&
Chas Williamsfb64c732007-12-30 23:18:29 -0800393 (memcmp(skb->data, llc_oui_pid_pad, 7) == 0)) {
Eric Kinzie097b19a2007-12-30 23:17:53 -0800394 skb_pull(skb, sizeof(llc_oui_pid_pad));
395 skb->protocol = eth_type_trans(skb, net_dev);
396 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 brdev->stats.rx_errors++;
398 dev_kfree_skb(skb);
399 return;
400 }
401
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 /* first 2 chars should be 0 */
404 if (*((u16 *) (skb->data)) != 0) {
405 brdev->stats.rx_errors++;
406 dev_kfree_skb(skb);
407 return;
408 }
Chas Williamsfb64c732007-12-30 23:18:29 -0800409 skb_pull(skb, BR2684_PAD_LEN + ETH_HLEN); /* pad, dstmac, srcmac, ethtype */
Eric Kinzie097b19a2007-12-30 23:17:53 -0800410 skb->protocol = eth_type_trans(skb, net_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 }
412
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413#ifdef CONFIG_ATM_BR2684_IPFILTER
414 if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb))) {
415 brdev->stats.rx_dropped++;
416 dev_kfree_skb(skb);
417 return;
418 }
419#endif /* CONFIG_ATM_BR2684_IPFILTER */
420 skb->dev = net_dev;
421 ATM_SKB(skb)->vcc = atmvcc; /* needed ? */
Stephen Hemminger52240062007-08-28 15:22:09 -0700422 pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 skb_debug(skb);
424 if (unlikely(!(net_dev->flags & IFF_UP))) {
425 /* sigh, interface is down */
426 brdev->stats.rx_dropped++;
427 dev_kfree_skb(skb);
428 return;
429 }
430 brdev->stats.rx_packets++;
431 brdev->stats.rx_bytes += skb->len;
432 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
433 netif_rx(skb);
434}
435
Chas Williamsfb64c732007-12-30 23:18:29 -0800436/*
437 * Assign a vcc to a dev
438 * Note: we do not have explicit unassign, but look at _push()
439 */
440static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442 int err;
443 struct br2684_vcc *brvcc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 struct sk_buff *skb;
David S. Millerc40a27f2006-11-30 21:05:23 -0800445 struct sk_buff_head *rq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 struct br2684_dev *brdev;
447 struct net_device *net_dev;
448 struct atm_backend_br2684 be;
David S. Millerc40a27f2006-11-30 21:05:23 -0800449 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450
451 if (copy_from_user(&be, arg, sizeof be))
452 return -EFAULT;
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700453 brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 if (!brvcc)
455 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 write_lock_irq(&devs_lock);
457 net_dev = br2684_find_dev(&be.ifspec);
458 if (net_dev == NULL) {
459 printk(KERN_ERR
Chas Williamsfb64c732007-12-30 23:18:29 -0800460 "br2684: tried to attach to non-existant device\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 err = -ENXIO;
462 goto error;
463 }
464 brdev = BRPRIV(net_dev);
465 if (atmvcc->push == NULL) {
466 err = -EBADFD;
467 goto error;
468 }
469 if (!list_empty(&brdev->brvccs)) {
470 /* Only 1 VCC/dev right now */
471 err = -EEXIST;
472 goto error;
473 }
474 if (be.fcs_in != BR2684_FCSIN_NO || be.fcs_out != BR2684_FCSOUT_NO ||
475 be.fcs_auto || be.has_vpiid || be.send_padding || (be.encaps !=
Chas Williamsfb64c732007-12-30 23:18:29 -0800476 BR2684_ENCAPS_VC
477 && be.encaps !=
478 BR2684_ENCAPS_LLC)
479 || be.min_size != 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 err = -EINVAL;
481 goto error;
482 }
Chas Williamsfb64c732007-12-30 23:18:29 -0800483 pr_debug("br2684_regvcc vcc=%p, encaps=%d, brvcc=%p\n", atmvcc,
484 be.encaps, brvcc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) {
486 unsigned char *esi = atmvcc->dev->esi;
487 if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5])
488 memcpy(net_dev->dev_addr, esi, net_dev->addr_len);
489 else
490 net_dev->dev_addr[2] = 1;
491 }
492 list_add(&brvcc->brvccs, &brdev->brvccs);
493 write_unlock_irq(&devs_lock);
494 brvcc->device = net_dev;
495 brvcc->atmvcc = atmvcc;
496 atmvcc->user_back = brvcc;
Chas Williamsfb64c732007-12-30 23:18:29 -0800497 brvcc->encaps = (enum br2684_encaps)be.encaps;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 brvcc->old_push = atmvcc->push;
499 barrier();
500 atmvcc->push = br2684_push;
David S. Millerc40a27f2006-11-30 21:05:23 -0800501
502 rq = &sk_atm(atmvcc)->sk_receive_queue;
503
504 spin_lock_irqsave(&rq->lock, flags);
505 if (skb_queue_empty(rq)) {
506 skb = NULL;
507 } else {
508 /* NULL terminate the list. */
509 rq->prev->next = NULL;
510 skb = rq->next;
511 }
512 rq->prev = rq->next = (struct sk_buff *)rq;
513 rq->qlen = 0;
514 spin_unlock_irqrestore(&rq->lock, flags);
515
516 while (skb) {
517 struct sk_buff *next = skb->next;
518
519 skb->next = skb->prev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 BRPRIV(skb->dev)->stats.rx_bytes -= skb->len;
521 BRPRIV(skb->dev)->stats.rx_packets--;
522 br2684_push(atmvcc, skb);
David S. Millerc40a27f2006-11-30 21:05:23 -0800523
524 skb = next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 }
526 __module_get(THIS_MODULE);
527 return 0;
Chas Williamsfb64c732007-12-30 23:18:29 -0800528 error:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 write_unlock_irq(&devs_lock);
530 kfree(brvcc);
531 return err;
532}
533
534static void br2684_setup(struct net_device *netdev)
535{
536 struct br2684_dev *brdev = BRPRIV(netdev);
537
538 ether_setup(netdev);
539 brdev->net_dev = netdev;
540
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 my_eth_mac_addr = netdev->set_mac_address;
542 netdev->set_mac_address = br2684_mac_addr;
543 netdev->hard_start_xmit = br2684_start_xmit;
544 netdev->get_stats = br2684_get_stats;
545
546 INIT_LIST_HEAD(&brdev->brvccs);
547}
548
Eric Kinzie097b19a2007-12-30 23:17:53 -0800549static void br2684_setup_routed(struct net_device *netdev)
550{
551 struct br2684_dev *brdev = BRPRIV(netdev);
552 brdev->net_dev = netdev;
553
554 netdev->hard_header_len = 0;
555 my_eth_mac_addr = netdev->set_mac_address;
556 netdev->set_mac_address = br2684_mac_addr;
557 netdev->hard_start_xmit = br2684_start_xmit;
558 netdev->get_stats = br2684_get_stats;
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
Chas Williamsfb64c732007-12-30 23:18:29 -0800567static int br2684_create(void __user * arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568{
569 int err;
570 struct net_device *netdev;
571 struct br2684_dev *brdev;
572 struct atm_newif_br2684 ni;
Eric Kinzie097b19a2007-12-30 23:17:53 -0800573 enum br2684_payload payload;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574
Stephen Hemminger52240062007-08-28 15:22:09 -0700575 pr_debug("br2684_create\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576
577 if (copy_from_user(&ni, arg, sizeof ni)) {
578 return -EFAULT;
579 }
Eric Kinzie097b19a2007-12-30 23:17:53 -0800580
581 if (ni.media & BR2684_FLAG_ROUTED)
582 payload = p_routed;
583 else
584 payload = p_bridged;
Chas Williamsfb64c732007-12-30 23:18:29 -0800585 ni.media &= 0xffff; /* strip flags */
Eric Kinzie097b19a2007-12-30 23:17:53 -0800586
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 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",
Eric Kinzie097b19a2007-12-30 23:17:53 -0800593 (payload == p_routed) ?
Chas Williamsfb64c732007-12-30 23:18:29 -0800594 br2684_setup_routed : br2684_setup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 if (!netdev)
596 return -ENOMEM;
597
598 brdev = BRPRIV(netdev);
599
Stephen Hemminger52240062007-08-28 15:22:09 -0700600 pr_debug("registered netdev %s\n", netdev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 /* 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);
Eric Kinzie097b19a2007-12-30 23:17:53 -0800610 brdev->payload = payload;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 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 */
622static int br2684_ioctl(struct socket *sock, unsigned int cmd,
Chas Williamsfb64c732007-12-30 23:18:29 -0800623 unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624{
625 struct atm_vcc *atmvcc = ATM_SD(sock);
626 void __user *argp = (void __user *)arg;
Chas Williamsfb64c732007-12-30 23:18:29 -0800627 atm_backend_t b;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628
629 int err;
Chas Williamsfb64c732007-12-30 23:18:29 -0800630 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631 case ATM_SETBACKEND:
Chas Williamsfb64c732007-12-30 23:18:29 -0800632 case ATM_NEWBACKENDIF:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644#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);
Chas Williamsfb64c732007-12-30 23:18:29 -0800651
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 return err;
653#endif /* CONFIG_ATM_BR2684_IPFILTER */
654 }
655 return -ENOIOCTLCMD;
656}
657
658static struct atm_ioctl br2684_ioctl_ops = {
Chas Williamsfb64c732007-12-30 23:18:29 -0800659 .owner = THIS_MODULE,
660 .ioctl = br2684_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661};
662
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663#ifdef CONFIG_PROC_FS
Chas Williamsfb64c732007-12-30 23:18:29 -0800664static void *br2684_seq_start(struct seq_file *seq, loff_t * pos)
Eric Dumazet5c17d5f2008-01-15 03:29:50 -0800665 __acquires(devs_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 read_lock(&devs_lock);
Pavel Emelianov9af97182007-07-09 13:12:24 -0700668 return seq_list_start(&br2684_devs, *pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669}
670
Chas Williamsfb64c732007-12-30 23:18:29 -0800671static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t * pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672{
Pavel Emelianov9af97182007-07-09 13:12:24 -0700673 return seq_list_next(v, &br2684_devs, pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674}
675
676static void br2684_seq_stop(struct seq_file *seq, void *v)
Eric Dumazet5c17d5f2008-01-15 03:29:50 -0800677 __releases(devs_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678{
679 read_unlock(&devs_lock);
680}
681
682static int br2684_seq_show(struct seq_file *seq, void *v)
683{
Pavel Emelianov9af97182007-07-09 13:12:24 -0700684 const struct br2684_dev *brdev = list_entry(v, struct br2684_dev,
Chas Williamsfb64c732007-12-30 23:18:29 -0800685 br2684_devs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 const struct net_device *net_dev = brdev->net_dev;
687 const struct br2684_vcc *brvcc;
Joe Perches0795af52007-10-03 17:59:30 -0700688 DECLARE_MAC_BUF(mac);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689
Joe Perches0795af52007-10-03 17:59:30 -0700690 seq_printf(seq, "dev %.16s: num=%d, mac=%s (%s)\n",
691 net_dev->name,
692 brdev->number,
693 print_mac(mac, net_dev->dev_addr),
694 brdev->mac_was_set ? "set" : "auto");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695
696 list_for_each_entry(brvcc, &brdev->brvccs, brvccs) {
Eric Kinzie097b19a2007-12-30 23:17:53 -0800697 seq_printf(seq, " vcc %d.%d.%d: encaps=%s payload=%s"
Chas Williamsfb64c732007-12-30 23:18:29 -0800698 ", failed copies %u/%u"
699 "\n", brvcc->atmvcc->dev->number,
700 brvcc->atmvcc->vpi, brvcc->atmvcc->vci,
701 (brvcc->encaps == e_llc) ? "LLC" : "VC",
702 (brdev->payload == p_bridged) ? "bridged" : "routed",
703 brvcc->copies_failed, brvcc->copies_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704#ifdef CONFIG_ATM_BR2684_IPFILTER
705#define b1(var, byte) ((u8 *) &brvcc->filter.var)[byte]
706#define bs(var) b1(var, 0), b1(var, 1), b1(var, 2), b1(var, 3)
Chas Williamsfb64c732007-12-30 23:18:29 -0800707 if (brvcc->filter.netmask != 0)
708 seq_printf(seq, " filter=%d.%d.%d.%d/"
709 "%d.%d.%d.%d\n", bs(prefix), bs(netmask));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710#undef bs
711#undef b1
712#endif /* CONFIG_ATM_BR2684_IPFILTER */
713 }
714 return 0;
715}
716
Philippe De Muyter56b3d972007-07-10 23:07:31 -0700717static const struct seq_operations br2684_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 .start = br2684_seq_start,
Chas Williamsfb64c732007-12-30 23:18:29 -0800719 .next = br2684_seq_next,
720 .stop = br2684_seq_stop,
721 .show = br2684_seq_show,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722};
723
724static int br2684_proc_open(struct inode *inode, struct file *file)
725{
726 return seq_open(file, &br2684_seq_ops);
727}
728
Arjan van de Ven9a321442007-02-12 00:55:35 -0800729static const struct file_operations br2684_proc_ops = {
Chas Williamsfb64c732007-12-30 23:18:29 -0800730 .owner = THIS_MODULE,
731 .open = br2684_proc_open,
732 .read = seq_read,
733 .llseek = seq_lseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 .release = seq_release,
735};
736
737extern struct proc_dir_entry *atm_proc_root; /* from proc.c */
Chas Williamsfb64c732007-12-30 23:18:29 -0800738#endif /* CONFIG_PROC_FS */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739
740static int __init br2684_init(void)
741{
742#ifdef CONFIG_PROC_FS
743 struct proc_dir_entry *p;
Wang Chen16e297b2008-02-28 13:55:45 -0800744 p = proc_create("br2684", 0, atm_proc_root, &br2684_proc_ops);
745 if (p == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747#endif
748 register_atm_ioctl(&br2684_ioctl_ops);
749 return 0;
750}
751
752static void __exit br2684_exit(void)
753{
754 struct net_device *net_dev;
755 struct br2684_dev *brdev;
756 struct br2684_vcc *brvcc;
757 deregister_atm_ioctl(&br2684_ioctl_ops);
758
759#ifdef CONFIG_PROC_FS
760 remove_proc_entry("br2684", atm_proc_root);
761#endif
762
763 while (!list_empty(&br2684_devs)) {
764 net_dev = list_entry_brdev(br2684_devs.next);
765 brdev = BRPRIV(net_dev);
766 while (!list_empty(&brdev->brvccs)) {
767 brvcc = list_entry_brvcc(brdev->brvccs.next);
768 br2684_close_vcc(brvcc);
769 }
770
771 list_del(&brdev->br2684_devs);
772 unregister_netdev(net_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 }
774}
775
776module_init(br2684_init);
777module_exit(br2684_exit);
778
779MODULE_AUTHOR("Marcell GAL");
780MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5");
781MODULE_LICENSE("GPL");