blob: 334fcd4a4ea469c26ecdc958b40ffa5b74d35f1e [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
Mitchell Blank Jr61c33e02008-06-17 16:20:06 -070055static const unsigned char ethertype_ipv4[] = { ETHERTYPE_IPV4 };
56static const unsigned char ethertype_ipv6[] = { ETHERTYPE_IPV6 };
57static const unsigned char llc_oui_pid_pad[] =
Chas Williamsfb64c732007-12-30 23:18:29 -080058 { LLC, SNAP_BRIDGED, PID_ETHERNET, PAD_BRIDGED };
Mitchell Blank Jr61c33e02008-06-17 16:20:06 -070059static const unsigned char llc_oui_ipv4[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV4 };
60static const 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 int mac_was_set;
Eric Kinzie097b19a2007-12-30 23:17:53 -080087 enum br2684_payload payload;
Linus Torvalds1da177e2005-04-16 15:20:36 -070088};
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 */
97static DEFINE_RWLOCK(devs_lock);
98
99static LIST_HEAD(br2684_devs);
100
101static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev)
102{
Wang Chen524ad0a2008-11-12 23:39:10 -0800103 return (struct br2684_dev *)netdev_priv(net_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104}
105
106static 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
111static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc)
112{
Chas Williamsfb64c732007-12-30 23:18:29 -0800113 return (struct br2684_vcc *)(atmvcc->user_back);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114}
115
116static 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) */
122static 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 */
Stephen Hemminger410e9d82009-01-09 13:00:58 +0000150static int br2684_xmit_vcc(struct sk_buff *skb, struct net_device *dev,
Chas Williamsfb64c732007-12-30 23:18:29 -0800151 struct br2684_vcc *brvcc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152{
Stephen Hemminger410e9d82009-01-09 13:00:58 +0000153 struct br2684_dev *brdev = BRPRIV(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 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 }
Eric Kinzie7e903c22008-06-16 17:18:18 -0700191 } else { /* e_vc */
192 if (brdev->payload == p_bridged) {
193 skb_push(skb, 2);
Eric Kinzie097b19a2007-12-30 23:17:53 -0800194 memset(skb->data, 0, 2);
Eric Kinzie7e903c22008-06-16 17:18:18 -0700195 } else { /* p_routed */
196 skb_pull(skb, ETH_HLEN);
197 }
Eric Kinzie097b19a2007-12-30 23:17:53 -0800198 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 skb_debug(skb);
200
201 ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc;
Stephen Hemminger52240062007-08-28 15:22:09 -0700202 pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 if (!atm_may_send(atmvcc, skb->truesize)) {
Chas Williamsfb64c732007-12-30 23:18:29 -0800204 /*
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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 dev_kfree_skb(skb);
210 return 0;
Chas Williamsfb64c732007-12-30 23:18:29 -0800211 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc);
213 ATM_SKB(skb)->atm_options = atmvcc->atm_options;
Stephen Hemminger410e9d82009-01-09 13:00:58 +0000214 dev->stats.tx_packets++;
215 dev->stats.tx_bytes += skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 atmvcc->send(atmvcc, skb);
217 return 1;
218}
219
Mitchell Blank Jr61c33e02008-06-17 16:20:06 -0700220static inline struct br2684_vcc *pick_outgoing_vcc(const struct sk_buff *skb,
221 const struct br2684_dev *brdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222{
Chas Williamsfb64c732007-12-30 23:18:29 -0800223 return list_empty(&brdev->brvccs) ? NULL : list_entry_brvcc(brdev->brvccs.next); /* 1 vcc/dev right now */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224}
225
226static 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
Stephen Hemminger52240062007-08-28 15:22:09 -0700231 pr_debug("br2684_start_xmit, skb->dst=%p\n", skb->dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 read_lock(&devs_lock);
233 brvcc = pick_outgoing_vcc(skb, brdev);
234 if (brvcc == NULL) {
Stephen Hemminger52240062007-08-28 15:22:09 -0700235 pr_debug("no vcc attached to dev %s\n", dev->name);
Stephen Hemminger410e9d82009-01-09 13:00:58 +0000236 dev->stats.tx_errors++;
237 dev->stats.tx_carrier_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 /* netif_stop_queue(dev); */
239 dev_kfree_skb(skb);
240 read_unlock(&devs_lock);
Jean-Denis Boyer4f55cd12005-10-07 13:44:35 -0700241 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 }
Stephen Hemminger410e9d82009-01-09 13:00:58 +0000243 if (!br2684_xmit_vcc(skb, dev, brvcc)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 /*
245 * We should probably use netif_*_queue() here, but that
246 * involves added complication. We need to walk before
Chas Williamsfb64c732007-12-30 23:18:29 -0800247 * we can run.
248 *
249 * Don't free here! this pointer might be no longer valid!
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 */
Stephen Hemminger410e9d82009-01-09 13:00:58 +0000251 dev->stats.tx_errors++;
252 dev->stats.tx_fifo_errors++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 }
254 read_unlock(&devs_lock);
255 return 0;
256}
257
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258/*
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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262static int br2684_mac_addr(struct net_device *dev, void *p)
263{
Stephen Hemminger0ba25ff2009-01-09 13:00:59 +0000264 int err = eth_mac_addr(dev, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 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. */
Chas Williamsfb64c732007-12-30 23:18:29 -0800272static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273{
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
Chas Williamsfb64c732007-12-30 23:18:29 -0800282 * by device.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 */
284 struct br2684_dev *brdev;
285 read_lock(&devs_lock);
286 brdev = BRPRIV(br2684_find_dev(&fs.ifspec));
Chas Williamsfb64c732007-12-30 23:18:29 -0800287 if (brdev == NULL || list_empty(&brdev->brvccs) || brdev->brvccs.next != brdev->brvccs.prev) /* >1 VCC */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 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 */
301static inline int
Al Viro30d492d2006-11-14 21:11:29 -0800302packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303{
304 if (brvcc->filter.netmask == 0)
Chas Williamsfb64c732007-12-30 23:18:29 -0800305 return 0; /* no filter in place */
YOSHIFUJI Hideakiacde4852007-03-25 20:12:32 -0700306 if (type == htons(ETH_P_IP) &&
Chas Williamsfb64c732007-12-30 23:18:29 -0800307 (((struct iphdr *)(skb->data))->daddr & brvcc->filter.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 netmask) == brvcc->filter.prefix)
309 return 0;
YOSHIFUJI Hideakiacde4852007-03-25 20:12:32 -0700310 if (type == htons(ETH_P_ARP))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 return 0;
Chas Williamsfb64c732007-12-30 23:18:29 -0800312 /*
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?
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 */
316 return 1; /* drop */
317}
318#endif /* CONFIG_ATM_BR2684_IPFILTER */
319
320static void br2684_close_vcc(struct br2684_vcc *brvcc)
321{
Stephen Hemminger52240062007-08-28 15:22:09 -0700322 pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 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: */
333static 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338
Stephen Hemminger52240062007-08-28 15:22:09 -0700339 pr_debug("br2684_push\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340
341 if (unlikely(skb == NULL)) {
342 /* skb==NULL means VCC is being destroyed */
343 br2684_close_vcc(brvcc);
344 if (list_empty(&brdev->brvccs)) {
Pavel Emelyanov1e0ba002008-05-04 18:00:36 -0700345 write_lock_irq(&devs_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 list_del(&brdev->br2684_devs);
Pavel Emelyanov1e0ba002008-05-04 18:00:36 -0700347 write_unlock_irq(&devs_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 unregister_netdev(net_dev);
David S. Miller5f6b1ea2008-05-06 00:00:16 -0700349 free_netdev(net_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 }
351 return;
352 }
353
354 skb_debug(skb);
355 atm_return(atmvcc, skb->truesize);
Stephen Hemminger52240062007-08-28 15:22:09 -0700356 pr_debug("skb from brdev %p\n", brdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 if (brvcc->encaps == e_llc) {
Eric Kinzie097b19a2007-12-30 23:17:53 -0800358
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)))
Chas Williamsfb64c732007-12-30 23:18:29 -0800364 &&
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)
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -0700371 skb->protocol = htons(ETH_P_IPV6);
Chas Williamsfb64c732007-12-30 23:18:29 -0800372 else if (memcmp
373 (skb->data + 6, ethertype_ipv4,
374 sizeof(ethertype_ipv4)) == 0)
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -0700375 skb->protocol = htons(ETH_P_IP);
Eric Kinzie7e903c22008-06-16 17:18:18 -0700376 else
377 goto error;
Eric Kinzie097b19a2007-12-30 23:17:53 -0800378 skb_pull(skb, sizeof(llc_oui_ipv4));
379 skb_reset_network_header(skb);
380 skb->pkt_type = PACKET_HOST;
Chas Williamsfb64c732007-12-30 23:18:29 -0800381 /*
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 */
Eric Kinzie097b19a2007-12-30 23:17:53 -0800386 } else if ((skb->len >= sizeof(llc_oui_pid_pad)) &&
Chas Williamsfb64c732007-12-30 23:18:29 -0800387 (memcmp(skb->data, llc_oui_pid_pad, 7) == 0)) {
Eric Kinzie097b19a2007-12-30 23:17:53 -0800388 skb_pull(skb, sizeof(llc_oui_pid_pad));
389 skb->protocol = eth_type_trans(skb, net_dev);
Eric Kinzie7e903c22008-06-16 17:18:18 -0700390 } else
391 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392
Eric Kinzie7e903c22008-06-16 17:18:18 -0700393 } 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)
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -0700400 skb->protocol = htons(ETH_P_IP);
Eric Kinzie7e903c22008-06-16 17:18:18 -0700401 else if (iph->version == 6)
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -0700402 skb->protocol = htons(ETH_P_IPV6);
Eric Kinzie7e903c22008-06-16 17:18:18 -0700403 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 }
414
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415#ifdef CONFIG_ATM_BR2684_IPFILTER
Eric Kinzie7e903c22008-06-16 17:18:18 -0700416 if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb)))
417 goto dropped;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418#endif /* CONFIG_ATM_BR2684_IPFILTER */
419 skb->dev = net_dev;
420 ATM_SKB(skb)->vcc = atmvcc; /* needed ? */
Stephen Hemminger52240062007-08-28 15:22:09 -0700421 pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 skb_debug(skb);
Eric Kinzie7e903c22008-06-16 17:18:18 -0700423 /* sigh, interface is down? */
424 if (unlikely(!(net_dev->flags & IFF_UP)))
425 goto dropped;
Stephen Hemminger410e9d82009-01-09 13:00:58 +0000426 net_dev->stats.rx_packets++;
427 net_dev->stats.rx_bytes += skb->len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data));
429 netif_rx(skb);
Eric Kinzie7e903c22008-06-16 17:18:18 -0700430 return;
431
432dropped:
Stephen Hemminger410e9d82009-01-09 13:00:58 +0000433 net_dev->stats.rx_dropped++;
Eric Kinzie7e903c22008-06-16 17:18:18 -0700434 goto free_skb;
435error:
Stephen Hemminger410e9d82009-01-09 13:00:58 +0000436 net_dev->stats.rx_errors++;
Eric Kinzie7e903c22008-06-16 17:18:18 -0700437free_skb:
438 dev_kfree_skb(skb);
439 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440}
441
Chas Williamsfb64c732007-12-30 23:18:29 -0800442/*
443 * Assign a vcc to a dev
444 * Note: we do not have explicit unassign, but look at _push()
445 */
446static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 int err;
449 struct br2684_vcc *brvcc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 struct sk_buff *skb;
David S. Millerc40a27f2006-11-30 21:05:23 -0800451 struct sk_buff_head *rq;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 struct br2684_dev *brdev;
453 struct net_device *net_dev;
454 struct atm_backend_br2684 be;
David S. Millerc40a27f2006-11-30 21:05:23 -0800455 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456
457 if (copy_from_user(&be, arg, sizeof be))
458 return -EFAULT;
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700459 brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 if (!brvcc)
461 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 write_lock_irq(&devs_lock);
463 net_dev = br2684_find_dev(&be.ifspec);
464 if (net_dev == NULL) {
465 printk(KERN_ERR
Chas Williamsfb64c732007-12-30 23:18:29 -0800466 "br2684: tried to attach to non-existant device\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 err = -ENXIO;
468 goto error;
469 }
470 brdev = BRPRIV(net_dev);
471 if (atmvcc->push == NULL) {
472 err = -EBADFD;
473 goto error;
474 }
475 if (!list_empty(&brdev->brvccs)) {
476 /* Only 1 VCC/dev right now */
477 err = -EEXIST;
478 goto error;
479 }
480 if (be.fcs_in != BR2684_FCSIN_NO || be.fcs_out != BR2684_FCSOUT_NO ||
481 be.fcs_auto || be.has_vpiid || be.send_padding || (be.encaps !=
Chas Williamsfb64c732007-12-30 23:18:29 -0800482 BR2684_ENCAPS_VC
483 && be.encaps !=
484 BR2684_ENCAPS_LLC)
485 || be.min_size != 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 err = -EINVAL;
487 goto error;
488 }
Chas Williamsfb64c732007-12-30 23:18:29 -0800489 pr_debug("br2684_regvcc vcc=%p, encaps=%d, brvcc=%p\n", atmvcc,
490 be.encaps, brvcc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) {
492 unsigned char *esi = atmvcc->dev->esi;
493 if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5])
494 memcpy(net_dev->dev_addr, esi, net_dev->addr_len);
495 else
496 net_dev->dev_addr[2] = 1;
497 }
498 list_add(&brvcc->brvccs, &brdev->brvccs);
499 write_unlock_irq(&devs_lock);
500 brvcc->device = net_dev;
501 brvcc->atmvcc = atmvcc;
502 atmvcc->user_back = brvcc;
Chas Williamsfb64c732007-12-30 23:18:29 -0800503 brvcc->encaps = (enum br2684_encaps)be.encaps;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 brvcc->old_push = atmvcc->push;
505 barrier();
506 atmvcc->push = br2684_push;
David S. Millerc40a27f2006-11-30 21:05:23 -0800507
508 rq = &sk_atm(atmvcc)->sk_receive_queue;
509
510 spin_lock_irqsave(&rq->lock, flags);
511 if (skb_queue_empty(rq)) {
512 skb = NULL;
513 } else {
514 /* NULL terminate the list. */
515 rq->prev->next = NULL;
516 skb = rq->next;
517 }
518 rq->prev = rq->next = (struct sk_buff *)rq;
519 rq->qlen = 0;
520 spin_unlock_irqrestore(&rq->lock, flags);
521
522 while (skb) {
523 struct sk_buff *next = skb->next;
524
525 skb->next = skb->prev = NULL;
Jorge Boncompte [DTI2]27141662008-06-16 17:15:33 -0700526 br2684_push(atmvcc, skb);
Stephen Hemminger410e9d82009-01-09 13:00:58 +0000527 skb->dev->stats.rx_bytes -= skb->len;
528 skb->dev->stats.rx_packets--;
David S. Millerc40a27f2006-11-30 21:05:23 -0800529
530 skb = next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 }
532 __module_get(THIS_MODULE);
533 return 0;
Chas Williamsfb64c732007-12-30 23:18:29 -0800534 error:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 write_unlock_irq(&devs_lock);
536 kfree(brvcc);
537 return err;
538}
539
Stephen Hemminger0ba25ff2009-01-09 13:00:59 +0000540static const struct net_device_ops br2684_netdev_ops = {
541 .ndo_start_xmit = br2684_start_xmit,
542 .ndo_set_mac_address = br2684_mac_addr,
543 .ndo_change_mtu = eth_change_mtu,
544 .ndo_validate_addr = eth_validate_addr,
545};
546
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547static void br2684_setup(struct net_device *netdev)
548{
549 struct br2684_dev *brdev = BRPRIV(netdev);
550
551 ether_setup(netdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552
Stephen Hemminger0ba25ff2009-01-09 13:00:59 +0000553 netdev->netdev_ops = &br2684_netdev_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554
555 INIT_LIST_HEAD(&brdev->brvccs);
556}
557
Eric Kinzie097b19a2007-12-30 23:17:53 -0800558static void br2684_setup_routed(struct net_device *netdev)
559{
560 struct br2684_dev *brdev = BRPRIV(netdev);
561 brdev->net_dev = netdev;
562
563 netdev->hard_header_len = 0;
Stephen Hemminger0ba25ff2009-01-09 13:00:59 +0000564
565 netdev->netdev_ops = &br2684_netdev_ops;
Eric Kinzie097b19a2007-12-30 23:17:53 -0800566 netdev->addr_len = 0;
567 netdev->mtu = 1500;
568 netdev->type = ARPHRD_PPP;
569 netdev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
570 netdev->tx_queue_len = 100;
571 INIT_LIST_HEAD(&brdev->brvccs);
572}
573
Chas Williamsfb64c732007-12-30 23:18:29 -0800574static int br2684_create(void __user * arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575{
576 int err;
577 struct net_device *netdev;
578 struct br2684_dev *brdev;
579 struct atm_newif_br2684 ni;
Eric Kinzie097b19a2007-12-30 23:17:53 -0800580 enum br2684_payload payload;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581
Stephen Hemminger52240062007-08-28 15:22:09 -0700582 pr_debug("br2684_create\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583
584 if (copy_from_user(&ni, arg, sizeof ni)) {
585 return -EFAULT;
586 }
Eric Kinzie097b19a2007-12-30 23:17:53 -0800587
588 if (ni.media & BR2684_FLAG_ROUTED)
589 payload = p_routed;
590 else
591 payload = p_bridged;
Chas Williamsfb64c732007-12-30 23:18:29 -0800592 ni.media &= 0xffff; /* strip flags */
Eric Kinzie097b19a2007-12-30 23:17:53 -0800593
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 if (ni.media != BR2684_MEDIA_ETHERNET || ni.mtu != 1500) {
595 return -EINVAL;
596 }
597
598 netdev = alloc_netdev(sizeof(struct br2684_dev),
599 ni.ifname[0] ? ni.ifname : "nas%d",
Eric Kinzie097b19a2007-12-30 23:17:53 -0800600 (payload == p_routed) ?
Chas Williamsfb64c732007-12-30 23:18:29 -0800601 br2684_setup_routed : br2684_setup);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 if (!netdev)
603 return -ENOMEM;
604
605 brdev = BRPRIV(netdev);
606
Stephen Hemminger52240062007-08-28 15:22:09 -0700607 pr_debug("registered netdev %s\n", netdev->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 /* open, stop, do_ioctl ? */
609 err = register_netdev(netdev);
610 if (err < 0) {
611 printk(KERN_ERR "br2684_create: register_netdev failed\n");
612 free_netdev(netdev);
613 return err;
614 }
615
616 write_lock_irq(&devs_lock);
Eric Kinzie097b19a2007-12-30 23:17:53 -0800617 brdev->payload = payload;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 brdev->number = list_empty(&br2684_devs) ? 1 :
619 BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1;
620 list_add_tail(&brdev->br2684_devs, &br2684_devs);
621 write_unlock_irq(&devs_lock);
622 return 0;
623}
624
625/*
626 * This handles ioctls actually performed on our vcc - we must return
627 * -ENOIOCTLCMD for any unrecognized ioctl
628 */
629static int br2684_ioctl(struct socket *sock, unsigned int cmd,
Chas Williamsfb64c732007-12-30 23:18:29 -0800630 unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631{
632 struct atm_vcc *atmvcc = ATM_SD(sock);
633 void __user *argp = (void __user *)arg;
Chas Williamsfb64c732007-12-30 23:18:29 -0800634 atm_backend_t b;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635
636 int err;
Chas Williamsfb64c732007-12-30 23:18:29 -0800637 switch (cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 case ATM_SETBACKEND:
Chas Williamsfb64c732007-12-30 23:18:29 -0800639 case ATM_NEWBACKENDIF:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 err = get_user(b, (atm_backend_t __user *) argp);
641 if (err)
642 return -EFAULT;
643 if (b != ATM_BACKEND_BR2684)
644 return -ENOIOCTLCMD;
645 if (!capable(CAP_NET_ADMIN))
646 return -EPERM;
647 if (cmd == ATM_SETBACKEND)
648 return br2684_regvcc(atmvcc, argp);
649 else
650 return br2684_create(argp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651#ifdef CONFIG_ATM_BR2684_IPFILTER
652 case BR2684_SETFILT:
653 if (atmvcc->push != br2684_push)
654 return -ENOIOCTLCMD;
655 if (!capable(CAP_NET_ADMIN))
656 return -EPERM;
657 err = br2684_setfilt(atmvcc, argp);
Chas Williamsfb64c732007-12-30 23:18:29 -0800658
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 return err;
660#endif /* CONFIG_ATM_BR2684_IPFILTER */
661 }
662 return -ENOIOCTLCMD;
663}
664
665static struct atm_ioctl br2684_ioctl_ops = {
Chas Williamsfb64c732007-12-30 23:18:29 -0800666 .owner = THIS_MODULE,
667 .ioctl = br2684_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668};
669
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670#ifdef CONFIG_PROC_FS
Chas Williamsfb64c732007-12-30 23:18:29 -0800671static void *br2684_seq_start(struct seq_file *seq, loff_t * pos)
Eric Dumazet5c17d5f2008-01-15 03:29:50 -0800672 __acquires(devs_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 read_lock(&devs_lock);
Pavel Emelianov9af97182007-07-09 13:12:24 -0700675 return seq_list_start(&br2684_devs, *pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676}
677
Chas Williamsfb64c732007-12-30 23:18:29 -0800678static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t * pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679{
Pavel Emelianov9af97182007-07-09 13:12:24 -0700680 return seq_list_next(v, &br2684_devs, pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681}
682
683static void br2684_seq_stop(struct seq_file *seq, void *v)
Eric Dumazet5c17d5f2008-01-15 03:29:50 -0800684 __releases(devs_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685{
686 read_unlock(&devs_lock);
687}
688
689static int br2684_seq_show(struct seq_file *seq, void *v)
690{
Pavel Emelianov9af97182007-07-09 13:12:24 -0700691 const struct br2684_dev *brdev = list_entry(v, struct br2684_dev,
Chas Williamsfb64c732007-12-30 23:18:29 -0800692 br2684_devs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693 const struct net_device *net_dev = brdev->net_dev;
694 const struct br2684_vcc *brvcc;
695
Johannes Berge1749612008-10-27 15:59:26 -0700696 seq_printf(seq, "dev %.16s: num=%d, mac=%pM (%s)\n",
Joe Perches0795af52007-10-03 17:59:30 -0700697 net_dev->name,
698 brdev->number,
Johannes Berge1749612008-10-27 15:59:26 -0700699 net_dev->dev_addr,
Joe Perches0795af52007-10-03 17:59:30 -0700700 brdev->mac_was_set ? "set" : "auto");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701
702 list_for_each_entry(brvcc, &brdev->brvccs, brvccs) {
Eric Kinzie097b19a2007-12-30 23:17:53 -0800703 seq_printf(seq, " vcc %d.%d.%d: encaps=%s payload=%s"
Chas Williamsfb64c732007-12-30 23:18:29 -0800704 ", failed copies %u/%u"
705 "\n", brvcc->atmvcc->dev->number,
706 brvcc->atmvcc->vpi, brvcc->atmvcc->vci,
707 (brvcc->encaps == e_llc) ? "LLC" : "VC",
708 (brdev->payload == p_bridged) ? "bridged" : "routed",
709 brvcc->copies_failed, brvcc->copies_needed);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710#ifdef CONFIG_ATM_BR2684_IPFILTER
711#define b1(var, byte) ((u8 *) &brvcc->filter.var)[byte]
712#define bs(var) b1(var, 0), b1(var, 1), b1(var, 2), b1(var, 3)
Chas Williamsfb64c732007-12-30 23:18:29 -0800713 if (brvcc->filter.netmask != 0)
714 seq_printf(seq, " filter=%d.%d.%d.%d/"
715 "%d.%d.%d.%d\n", bs(prefix), bs(netmask));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716#undef bs
717#undef b1
718#endif /* CONFIG_ATM_BR2684_IPFILTER */
719 }
720 return 0;
721}
722
Philippe De Muyter56b3d972007-07-10 23:07:31 -0700723static const struct seq_operations br2684_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 .start = br2684_seq_start,
Chas Williamsfb64c732007-12-30 23:18:29 -0800725 .next = br2684_seq_next,
726 .stop = br2684_seq_stop,
727 .show = br2684_seq_show,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728};
729
730static int br2684_proc_open(struct inode *inode, struct file *file)
731{
732 return seq_open(file, &br2684_seq_ops);
733}
734
Arjan van de Ven9a321442007-02-12 00:55:35 -0800735static const struct file_operations br2684_proc_ops = {
Chas Williamsfb64c732007-12-30 23:18:29 -0800736 .owner = THIS_MODULE,
737 .open = br2684_proc_open,
738 .read = seq_read,
739 .llseek = seq_lseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 .release = seq_release,
741};
742
743extern struct proc_dir_entry *atm_proc_root; /* from proc.c */
Chas Williamsfb64c732007-12-30 23:18:29 -0800744#endif /* CONFIG_PROC_FS */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745
746static int __init br2684_init(void)
747{
748#ifdef CONFIG_PROC_FS
749 struct proc_dir_entry *p;
Wang Chen16e297b2008-02-28 13:55:45 -0800750 p = proc_create("br2684", 0, atm_proc_root, &br2684_proc_ops);
751 if (p == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753#endif
754 register_atm_ioctl(&br2684_ioctl_ops);
755 return 0;
756}
757
758static void __exit br2684_exit(void)
759{
760 struct net_device *net_dev;
761 struct br2684_dev *brdev;
762 struct br2684_vcc *brvcc;
763 deregister_atm_ioctl(&br2684_ioctl_ops);
764
765#ifdef CONFIG_PROC_FS
766 remove_proc_entry("br2684", atm_proc_root);
767#endif
768
769 while (!list_empty(&br2684_devs)) {
770 net_dev = list_entry_brdev(br2684_devs.next);
771 brdev = BRPRIV(net_dev);
772 while (!list_empty(&brdev->brvccs)) {
773 brvcc = list_entry_brvcc(brdev->brvccs.next);
774 br2684_close_vcc(brvcc);
775 }
776
777 list_del(&brdev->br2684_devs);
778 unregister_netdev(net_dev);
David S. Miller5f6b1ea2008-05-06 00:00:16 -0700779 free_netdev(net_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 }
781}
782
783module_init(br2684_init);
784module_exit(br2684_exit);
785
786MODULE_AUTHOR("Marcell GAL");
787MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5");
788MODULE_LICENSE("GPL");