blob: 238af093495b2448e140fbf3366c0ad45ef8d1f0 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * DECnet An implementation of the DECnet protocol suite for the LINUX
3 * operating system. DECnet is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
5 *
6 * DECnet Device Layer
7 *
8 * Authors: Steve Whitehouse <SteveW@ACM.org>
9 * Eduardo Marcelo Serrat <emserrat@geocities.com>
10 *
11 * Changes:
12 * Steve Whitehouse : Devices now see incoming frames so they
13 * can mark on who it came from.
14 * Steve Whitehouse : Fixed bug in creating neighbours. Each neighbour
15 * can now have a device specific setup func.
16 * Steve Whitehouse : Added /proc/sys/net/decnet/conf/<dev>/
17 * Steve Whitehouse : Fixed bug which sometimes killed timer
18 * Steve Whitehouse : Multiple ifaddr support
19 * Steve Whitehouse : SIOCGIFCONF is now a compile time option
20 * Steve Whitehouse : /proc/sys/net/decnet/conf/<sys>/forwarding
21 * Steve Whitehouse : Removed timer1 - it's a user space issue now
22 * Patrick Caulfield : Fixed router hello message format
23 * Steve Whitehouse : Got rid of constant sizes for blksize for
24 * devices. All mtu based now.
25 */
26
Randy Dunlap4fc268d2006-01-11 12:17:47 -080027#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <linux/module.h>
29#include <linux/moduleparam.h>
30#include <linux/init.h>
31#include <linux/net.h>
32#include <linux/netdevice.h>
33#include <linux/proc_fs.h>
34#include <linux/seq_file.h>
35#include <linux/timer.h>
36#include <linux/string.h>
Thomas Graf18237302006-08-04 23:04:54 -070037#include <linux/if_addr.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#include <linux/if_arp.h>
39#include <linux/if_ether.h>
40#include <linux/skbuff.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include <linux/sysctl.h>
42#include <linux/notifier.h>
43#include <asm/uaccess.h>
44#include <asm/system.h>
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020045#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070046#include <net/neighbour.h>
47#include <net/dst.h>
48#include <net/flow.h>
Steven Whitehousea8731cb2006-08-09 15:56:46 -070049#include <net/fib_rules.h>
Thomas Grafa6f01ca2006-11-24 17:14:07 -080050#include <net/netlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#include <net/dn.h>
52#include <net/dn_dev.h>
53#include <net/dn_route.h>
54#include <net/dn_neigh.h>
55#include <net/dn_fib.h>
56
57#define DN_IFREQ_SIZE (sizeof(struct ifreq) - sizeof(struct sockaddr) + sizeof(struct sockaddr_dn))
58
59static char dn_rt_all_end_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x04,0x00,0x00};
60static char dn_rt_all_rt_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x03,0x00,0x00};
61static char dn_hiord[ETH_ALEN] = {0xAA,0x00,0x04,0x00,0x00,0x00};
62static unsigned char dn_eco_version[3] = {0x02,0x00,0x00};
63
64extern struct neigh_table dn_neigh_table;
65
66/*
67 * decnet_address is kept in network order.
68 */
Steven Whitehousec4ea94a2006-03-20 22:42:39 -080069__le16 decnet_address = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
stephen hemmingere5c140a2009-11-11 07:40:36 +000071static DEFINE_SPINLOCK(dndev_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070072static struct net_device *decnet_default_device;
Alan Sterne041c682006-03-27 01:16:30 -080073static BLOCKING_NOTIFIER_HEAD(dnaddr_chain);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
75static struct dn_dev *dn_dev_create(struct net_device *dev, int *err);
76static void dn_dev_delete(struct net_device *dev);
Thomas Grafb020b942006-11-24 17:14:31 -080077static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa);
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
79static int dn_eth_up(struct net_device *);
80static void dn_eth_down(struct net_device *);
81static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa);
82static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa);
83
84static struct dn_dev_parms dn_dev_list[] = {
85{
86 .type = ARPHRD_ETHER, /* Ethernet */
87 .mode = DN_DEV_BCAST,
88 .state = DN_DEV_S_RU,
89 .t2 = 1,
90 .t3 = 10,
91 .name = "ethernet",
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 .up = dn_eth_up,
93 .down = dn_eth_down,
94 .timer3 = dn_send_brd_hello,
95},
96{
97 .type = ARPHRD_IPGRE, /* DECnet tunneled over GRE in IP */
98 .mode = DN_DEV_BCAST,
99 .state = DN_DEV_S_RU,
100 .t2 = 1,
101 .t3 = 10,
102 .name = "ipgre",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 .timer3 = dn_send_brd_hello,
104},
105#if 0
106{
107 .type = ARPHRD_X25, /* Bog standard X.25 */
108 .mode = DN_DEV_UCAST,
109 .state = DN_DEV_S_DS,
110 .t2 = 1,
111 .t3 = 120,
112 .name = "x25",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 .timer3 = dn_send_ptp_hello,
114},
115#endif
116#if 0
117{
118 .type = ARPHRD_PPP, /* DECnet over PPP */
119 .mode = DN_DEV_BCAST,
120 .state = DN_DEV_S_RU,
121 .t2 = 1,
122 .t3 = 10,
123 .name = "ppp",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 .timer3 = dn_send_brd_hello,
125},
126#endif
127{
128 .type = ARPHRD_DDCMP, /* DECnet over DDCMP */
129 .mode = DN_DEV_UCAST,
130 .state = DN_DEV_S_DS,
131 .t2 = 1,
132 .t3 = 120,
133 .name = "ddcmp",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 .timer3 = dn_send_ptp_hello,
135},
136{
137 .type = ARPHRD_LOOPBACK, /* Loopback interface - always last */
138 .mode = DN_DEV_BCAST,
139 .state = DN_DEV_S_RU,
140 .t2 = 1,
141 .t3 = 10,
142 .name = "loopback",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 .timer3 = dn_send_brd_hello,
144}
145};
146
Denis Cheng8b14a532007-09-16 16:41:29 -0700147#define DN_DEV_LIST_SIZE ARRAY_SIZE(dn_dev_list)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
David S. Miller8fa0b312008-10-15 15:59:50 -0700149#define DN_DEV_PARMS_OFFSET(x) offsetof(struct dn_dev_parms, x)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150
151#ifdef CONFIG_SYSCTL
152
153static int min_t2[] = { 1 };
154static int max_t2[] = { 60 }; /* No max specified, but this seems sensible */
155static int min_t3[] = { 1 };
156static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MULT or T3MULT */
157
158static int min_priority[1];
159static int max_priority[] = { 127 }; /* From DECnet spec */
160
Alexey Dobriyan8d65af72009-09-23 15:57:19 -0700161static int dn_forwarding_proc(ctl_table *, int,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 void __user *, size_t *, loff_t *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163static struct dn_dev_sysctl_table {
164 struct ctl_table_header *sysctl_header;
165 ctl_table dn_dev_vars[5];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166} dn_dev_sysctl = {
167 NULL,
168 {
169 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 .procname = "forwarding",
171 .data = (void *)DN_DEV_PARMS_OFFSET(forwarding),
172 .maxlen = sizeof(int),
173 .mode = 0644,
174 .proc_handler = dn_forwarding_proc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 },
176 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 .procname = "priority",
178 .data = (void *)DN_DEV_PARMS_OFFSET(priority),
179 .maxlen = sizeof(int),
180 .mode = 0644,
181 .proc_handler = proc_dointvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 .extra1 = &min_priority,
183 .extra2 = &max_priority
184 },
185 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 .procname = "t2",
187 .data = (void *)DN_DEV_PARMS_OFFSET(t2),
188 .maxlen = sizeof(int),
189 .mode = 0644,
190 .proc_handler = proc_dointvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 .extra1 = &min_t2,
192 .extra2 = &max_t2
193 },
194 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 .procname = "t3",
196 .data = (void *)DN_DEV_PARMS_OFFSET(t3),
197 .maxlen = sizeof(int),
198 .mode = 0644,
199 .proc_handler = proc_dointvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 .extra1 = &min_t3,
201 .extra2 = &max_t3
202 },
203 {0}
204 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205};
206
207static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
208{
209 struct dn_dev_sysctl_table *t;
210 int i;
211
Pavel Emelyanov3151a9a2008-01-09 00:31:49 -0800212#define DN_CTL_PATH_DEV 3
213
214 struct ctl_path dn_ctl_path[] = {
Eric W. Biedermanf8572d82009-11-05 13:32:03 -0800215 { .procname = "net", },
216 { .procname = "decnet", },
217 { .procname = "conf", },
Pavel Emelyanov3151a9a2008-01-09 00:31:49 -0800218 { /* to be set */ },
219 { },
220 };
221
Arnaldo Carvalho de Meloc66b7212006-11-17 12:29:21 -0200222 t = kmemdup(&dn_dev_sysctl, sizeof(*t), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 if (t == NULL)
224 return;
225
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) {
227 long offset = (long)t->dn_dev_vars[i].data;
228 t->dn_dev_vars[i].data = ((char *)parms) + offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 }
230
231 if (dev) {
Pavel Emelyanov3151a9a2008-01-09 00:31:49 -0800232 dn_ctl_path[DN_CTL_PATH_DEV].procname = dev->name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 } else {
Pavel Emelyanov3151a9a2008-01-09 00:31:49 -0800234 dn_ctl_path[DN_CTL_PATH_DEV].procname = parms->name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 }
236
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 t->dn_dev_vars[0].extra1 = (void *)dev;
238
Pavel Emelyanov3151a9a2008-01-09 00:31:49 -0800239 t->sysctl_header = register_sysctl_paths(dn_ctl_path, t->dn_dev_vars);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 if (t->sysctl_header == NULL)
241 kfree(t);
242 else
243 parms->sysctl = t;
244}
245
246static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
247{
248 if (parms->sysctl) {
249 struct dn_dev_sysctl_table *t = parms->sysctl;
250 parms->sysctl = NULL;
251 unregister_sysctl_table(t->sysctl_header);
252 kfree(t);
253 }
254}
255
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900256static int dn_forwarding_proc(ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 void __user *buffer,
258 size_t *lenp, loff_t *ppos)
259{
260#ifdef CONFIG_DECNET_ROUTER
261 struct net_device *dev = table->extra1;
262 struct dn_dev *dn_db;
263 int err;
264 int tmp, old;
265
266 if (table->extra1 == NULL)
267 return -EINVAL;
268
269 dn_db = dev->dn_ptr;
270 old = dn_db->parms.forwarding;
271
Alexey Dobriyan8d65af72009-09-23 15:57:19 -0700272 err = proc_dointvec(table, write, buffer, lenp, ppos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273
274 if ((err >= 0) && write) {
275 if (dn_db->parms.forwarding < 0)
276 dn_db->parms.forwarding = 0;
277 if (dn_db->parms.forwarding > 2)
278 dn_db->parms.forwarding = 2;
279 /*
280 * What an ugly hack this is... its works, just. It
281 * would be nice if sysctl/proc were just that little
282 * bit more flexible so I don't have to write a special
283 * routine, or suffer hacks like this - SJW
284 */
285 tmp = dn_db->parms.forwarding;
286 dn_db->parms.forwarding = old;
287 if (dn_db->parms.down)
288 dn_db->parms.down(dev);
289 dn_db->parms.forwarding = tmp;
290 if (dn_db->parms.up)
291 dn_db->parms.up(dev);
292 }
293
294 return err;
295#else
296 return -EINVAL;
297#endif
298}
299
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300#else /* CONFIG_SYSCTL */
301static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
302{
303}
304static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
305{
306}
307
308#endif /* CONFIG_SYSCTL */
309
310static inline __u16 mtu2blksize(struct net_device *dev)
311{
312 u32 blksize = dev->mtu;
313 if (blksize > 0xffff)
314 blksize = 0xffff;
315
316 if (dev->type == ARPHRD_ETHER ||
317 dev->type == ARPHRD_PPP ||
318 dev->type == ARPHRD_IPGRE ||
319 dev->type == ARPHRD_LOOPBACK)
320 blksize -= 2;
321
322 return (__u16)blksize;
323}
324
325static struct dn_ifaddr *dn_dev_alloc_ifa(void)
326{
327 struct dn_ifaddr *ifa;
328
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700329 ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330
331 return ifa;
332}
333
334static __inline__ void dn_dev_free_ifa(struct dn_ifaddr *ifa)
335{
336 kfree(ifa);
337}
338
339static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr **ifap, int destroy)
340{
341 struct dn_ifaddr *ifa1 = *ifap;
342 unsigned char mac_addr[6];
343 struct net_device *dev = dn_db->dev;
344
345 ASSERT_RTNL();
346
347 *ifap = ifa1->ifa_next;
348
349 if (dn_db->dev->type == ARPHRD_ETHER) {
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800350 if (ifa1->ifa_local != dn_eth2dn(dev->dev_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 dn_dn2eth(mac_addr, ifa1->ifa_local);
352 dev_mc_delete(dev, mac_addr, ETH_ALEN, 0);
353 }
354 }
355
Thomas Grafb020b942006-11-24 17:14:31 -0800356 dn_ifaddr_notify(RTM_DELADDR, ifa1);
Alan Sterne041c682006-03-27 01:16:30 -0800357 blocking_notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 if (destroy) {
359 dn_dev_free_ifa(ifa1);
360
361 if (dn_db->ifa_list == NULL)
362 dn_dev_delete(dn_db->dev);
363 }
364}
365
366static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
367{
368 struct net_device *dev = dn_db->dev;
369 struct dn_ifaddr *ifa1;
370 unsigned char mac_addr[6];
371
372 ASSERT_RTNL();
373
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900374 /* Check for duplicates */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 for(ifa1 = dn_db->ifa_list; ifa1; ifa1 = ifa1->ifa_next) {
376 if (ifa1->ifa_local == ifa->ifa_local)
377 return -EEXIST;
378 }
379
380 if (dev->type == ARPHRD_ETHER) {
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800381 if (ifa->ifa_local != dn_eth2dn(dev->dev_addr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 dn_dn2eth(mac_addr, ifa->ifa_local);
383 dev_mc_add(dev, mac_addr, ETH_ALEN, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 }
385 }
386
387 ifa->ifa_next = dn_db->ifa_list;
388 dn_db->ifa_list = ifa;
389
Thomas Grafb020b942006-11-24 17:14:31 -0800390 dn_ifaddr_notify(RTM_NEWADDR, ifa);
Alan Sterne041c682006-03-27 01:16:30 -0800391 blocking_notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392
393 return 0;
394}
395
396static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
397{
398 struct dn_dev *dn_db = dev->dn_ptr;
399 int rv;
400
401 if (dn_db == NULL) {
402 int err;
403 dn_db = dn_dev_create(dev, &err);
404 if (dn_db == NULL)
405 return err;
406 }
407
408 ifa->ifa_dev = dn_db;
409
410 if (dev->flags & IFF_LOOPBACK)
411 ifa->ifa_scope = RT_SCOPE_HOST;
412
413 rv = dn_dev_insert_ifa(dn_db, ifa);
414 if (rv)
415 dn_dev_free_ifa(ifa);
416 return rv;
417}
418
419
420int dn_dev_ioctl(unsigned int cmd, void __user *arg)
421{
422 char buffer[DN_IFREQ_SIZE];
423 struct ifreq *ifr = (struct ifreq *)buffer;
424 struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
425 struct dn_dev *dn_db;
426 struct net_device *dev;
427 struct dn_ifaddr *ifa = NULL, **ifap = NULL;
428 int ret = 0;
429
430 if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
431 return -EFAULT;
432 ifr->ifr_name[IFNAMSIZ-1] = 0;
433
Eric W. Biederman881d9662007-09-17 11:56:21 -0700434 dev_load(&init_net, ifr->ifr_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435
436 switch(cmd) {
437 case SIOCGIFADDR:
438 break;
439 case SIOCSIFADDR:
440 if (!capable(CAP_NET_ADMIN))
441 return -EACCES;
442 if (sdn->sdn_family != AF_DECnet)
443 return -EINVAL;
444 break;
445 default:
446 return -EINVAL;
447 }
448
449 rtnl_lock();
450
Eric W. Biederman881d9662007-09-17 11:56:21 -0700451 if ((dev = __dev_get_by_name(&init_net, ifr->ifr_name)) == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 ret = -ENODEV;
453 goto done;
454 }
455
456 if ((dn_db = dev->dn_ptr) != NULL) {
457 for (ifap = &dn_db->ifa_list; (ifa=*ifap) != NULL; ifap = &ifa->ifa_next)
458 if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
459 break;
460 }
461
462 if (ifa == NULL && cmd != SIOCSIFADDR) {
463 ret = -EADDRNOTAVAIL;
464 goto done;
465 }
466
467 switch(cmd) {
468 case SIOCGIFADDR:
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800469 *((__le16 *)sdn->sdn_nodeaddr) = ifa->ifa_local;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 goto rarok;
471
472 case SIOCSIFADDR:
473 if (!ifa) {
474 if ((ifa = dn_dev_alloc_ifa()) == NULL) {
475 ret = -ENOBUFS;
476 break;
477 }
478 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
479 } else {
480 if (ifa->ifa_local == dn_saddr2dn(sdn))
481 break;
482 dn_dev_del_ifa(dn_db, ifap, 0);
483 }
484
485 ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
486
487 ret = dn_dev_set_ifa(dev, ifa);
488 }
489done:
490 rtnl_unlock();
491
492 return ret;
493rarok:
494 if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
495 ret = -EFAULT;
496 goto done;
497}
498
499struct net_device *dn_dev_get_default(void)
500{
501 struct net_device *dev;
stephen hemmingere5c140a2009-11-11 07:40:36 +0000502
503 spin_lock(&dndev_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 dev = decnet_default_device;
505 if (dev) {
506 if (dev->dn_ptr)
507 dev_hold(dev);
508 else
509 dev = NULL;
510 }
stephen hemmingere5c140a2009-11-11 07:40:36 +0000511 spin_unlock(&dndev_lock);
512
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 return dev;
514}
515
516int dn_dev_set_default(struct net_device *dev, int force)
517{
518 struct net_device *old = NULL;
519 int rv = -EBUSY;
520 if (!dev->dn_ptr)
521 return -ENODEV;
stephen hemmingere5c140a2009-11-11 07:40:36 +0000522
523 spin_lock(&dndev_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 if (force || decnet_default_device == NULL) {
525 old = decnet_default_device;
526 decnet_default_device = dev;
527 rv = 0;
528 }
stephen hemmingere5c140a2009-11-11 07:40:36 +0000529 spin_unlock(&dndev_lock);
530
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 if (old)
Patrick Caulfield6a57b2e2006-03-29 13:57:31 -0800532 dev_put(old);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 return rv;
534}
535
536static void dn_dev_check_default(struct net_device *dev)
537{
stephen hemmingere5c140a2009-11-11 07:40:36 +0000538 spin_lock(&dndev_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 if (dev == decnet_default_device) {
540 decnet_default_device = NULL;
541 } else {
542 dev = NULL;
543 }
stephen hemmingere5c140a2009-11-11 07:40:36 +0000544 spin_unlock(&dndev_lock);
545
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 if (dev)
547 dev_put(dev);
548}
549
Eric Dumazetb4d745d2009-11-04 10:59:38 -0800550/*
551 * Called with RTNL
552 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553static struct dn_dev *dn_dev_by_index(int ifindex)
554{
555 struct net_device *dev;
556 struct dn_dev *dn_dev = NULL;
Eric Dumazetb4d745d2009-11-04 10:59:38 -0800557
558 dev = __dev_get_by_index(&init_net, ifindex);
559 if (dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 dn_dev = dev->dn_ptr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561
562 return dn_dev;
563}
564
Patrick McHardyef7c79e2007-06-05 12:38:30 -0700565static const struct nla_policy dn_ifa_policy[IFA_MAX+1] = {
Thomas Graf4a89c252006-11-24 17:14:51 -0800566 [IFA_ADDRESS] = { .type = NLA_U16 },
567 [IFA_LOCAL] = { .type = NLA_U16 },
568 [IFA_LABEL] = { .type = NLA_STRING,
569 .len = IFNAMSIZ - 1 },
570};
571
572static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900574 struct net *net = sock_net(skb->sk);
Thomas Graf4a89c252006-11-24 17:14:51 -0800575 struct nlattr *tb[IFA_MAX+1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 struct dn_dev *dn_db;
Thomas Graf4a89c252006-11-24 17:14:51 -0800577 struct ifaddrmsg *ifm;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 struct dn_ifaddr *ifa, **ifap;
Denis V. Lunevb8542722007-12-01 00:21:31 +1100579 int err = -EINVAL;
580
Octavian Purdila09ad9bc2009-11-25 15:14:13 -0800581 if (!net_eq(net, &init_net))
Denis V. Lunevb8542722007-12-01 00:21:31 +1100582 goto errout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583
Thomas Graf4a89c252006-11-24 17:14:51 -0800584 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
585 if (err < 0)
586 goto errout;
587
Pavel Emelyanov3ccd8622007-11-30 23:43:31 +1100588 err = -ENODEV;
Thomas Graf4a89c252006-11-24 17:14:51 -0800589 ifm = nlmsg_data(nlh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
Thomas Graf4a89c252006-11-24 17:14:51 -0800591 goto errout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592
Pavel Emelyanov3ccd8622007-11-30 23:43:31 +1100593 err = -EADDRNOTAVAIL;
Thomas Graf4a89c252006-11-24 17:14:51 -0800594 for (ifap = &dn_db->ifa_list; (ifa = *ifap); ifap = &ifa->ifa_next) {
595 if (tb[IFA_LOCAL] &&
596 nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
597 continue;
598
599 if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 continue;
601
602 dn_dev_del_ifa(dn_db, ifap, 1);
603 return 0;
604 }
605
Thomas Graf4a89c252006-11-24 17:14:51 -0800606errout:
607 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608}
609
Thomas Graf4a89c252006-11-24 17:14:51 -0800610static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900612 struct net *net = sock_net(skb->sk);
Thomas Graf4a89c252006-11-24 17:14:51 -0800613 struct nlattr *tb[IFA_MAX+1];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 struct net_device *dev;
615 struct dn_dev *dn_db;
Thomas Graf4a89c252006-11-24 17:14:51 -0800616 struct ifaddrmsg *ifm;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 struct dn_ifaddr *ifa;
Thomas Graf4a89c252006-11-24 17:14:51 -0800618 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619
Octavian Purdila09ad9bc2009-11-25 15:14:13 -0800620 if (!net_eq(net, &init_net))
Denis V. Lunevb8542722007-12-01 00:21:31 +1100621 return -EINVAL;
622
Thomas Graf4a89c252006-11-24 17:14:51 -0800623 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
624 if (err < 0)
625 return err;
626
627 if (tb[IFA_LOCAL] == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 return -EINVAL;
629
Thomas Graf4a89c252006-11-24 17:14:51 -0800630 ifm = nlmsg_data(nlh);
Eric W. Biederman881d9662007-09-17 11:56:21 -0700631 if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632 return -ENODEV;
633
634 if ((dn_db = dev->dn_ptr) == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 dn_db = dn_dev_create(dev, &err);
636 if (!dn_db)
637 return err;
638 }
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900639
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 if ((ifa = dn_dev_alloc_ifa()) == NULL)
641 return -ENOBUFS;
642
Thomas Graf4a89c252006-11-24 17:14:51 -0800643 if (tb[IFA_ADDRESS] == NULL)
644 tb[IFA_ADDRESS] = tb[IFA_LOCAL];
645
646 ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]);
647 ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 ifa->ifa_flags = ifm->ifa_flags;
649 ifa->ifa_scope = ifm->ifa_scope;
650 ifa->ifa_dev = dn_db;
Thomas Graf4a89c252006-11-24 17:14:51 -0800651
652 if (tb[IFA_LABEL])
653 nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 else
655 memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
656
Thomas Graf4a89c252006-11-24 17:14:51 -0800657 err = dn_dev_insert_ifa(dn_db, ifa);
658 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 dn_dev_free_ifa(ifa);
Thomas Graf4a89c252006-11-24 17:14:51 -0800660
661 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662}
663
Thomas Grafa6f01ca2006-11-24 17:14:07 -0800664static inline size_t dn_ifaddr_nlmsg_size(void)
665{
666 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
667 + nla_total_size(IFNAMSIZ) /* IFA_LABEL */
668 + nla_total_size(2) /* IFA_ADDRESS */
669 + nla_total_size(2); /* IFA_LOCAL */
670}
671
Thomas Graf4a89c252006-11-24 17:14:51 -0800672static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
673 u32 pid, u32 seq, int event, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674{
675 struct ifaddrmsg *ifm;
676 struct nlmsghdr *nlh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677
Thomas Graf4a89c252006-11-24 17:14:51 -0800678 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*ifm), flags);
679 if (nlh == NULL)
Patrick McHardy26932562007-01-31 23:16:40 -0800680 return -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681
Thomas Graf4a89c252006-11-24 17:14:51 -0800682 ifm = nlmsg_data(nlh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683 ifm->ifa_family = AF_DECnet;
684 ifm->ifa_prefixlen = 16;
685 ifm->ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
686 ifm->ifa_scope = ifa->ifa_scope;
687 ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688
Thomas Graf4a89c252006-11-24 17:14:51 -0800689 if (ifa->ifa_address)
690 NLA_PUT_LE16(skb, IFA_ADDRESS, ifa->ifa_address);
691 if (ifa->ifa_local)
692 NLA_PUT_LE16(skb, IFA_LOCAL, ifa->ifa_local);
693 if (ifa->ifa_label[0])
694 NLA_PUT_STRING(skb, IFA_LABEL, ifa->ifa_label);
695
696 return nlmsg_end(skb, nlh);
697
698nla_put_failure:
Patrick McHardy26932562007-01-31 23:16:40 -0800699 nlmsg_cancel(skb, nlh);
700 return -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701}
702
Thomas Grafb020b942006-11-24 17:14:31 -0800703static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704{
705 struct sk_buff *skb;
Thomas Grafdc738dd2006-08-15 00:33:35 -0700706 int err = -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707
Thomas Grafa6f01ca2006-11-24 17:14:07 -0800708 skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
Thomas Grafdc738dd2006-08-15 00:33:35 -0700709 if (skb == NULL)
710 goto errout;
711
Thomas Graf4a89c252006-11-24 17:14:51 -0800712 err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
Patrick McHardy26932562007-01-31 23:16:40 -0800713 if (err < 0) {
714 /* -EMSGSIZE implies BUG in dn_ifaddr_nlmsg_size() */
715 WARN_ON(err == -EMSGSIZE);
716 kfree_skb(skb);
717 goto errout;
718 }
Pablo Neira Ayuso1ce85fe2009-02-24 23:18:28 -0800719 rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
720 return;
Thomas Grafdc738dd2006-08-15 00:33:35 -0700721errout:
722 if (err < 0)
Denis V. Lunev97c53ca2007-11-19 22:26:51 -0800723 rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724}
725
Thomas Graf4a89c252006-11-24 17:14:51 -0800726static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727{
YOSHIFUJI Hideaki3b1e0a62008-03-26 02:26:21 +0900728 struct net *net = sock_net(skb->sk);
Thomas Graf4a89c252006-11-24 17:14:51 -0800729 int idx, dn_idx = 0, skip_ndevs, skip_naddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 struct net_device *dev;
731 struct dn_dev *dn_db;
732 struct dn_ifaddr *ifa;
733
Octavian Purdila09ad9bc2009-11-25 15:14:13 -0800734 if (!net_eq(net, &init_net))
Denis V. Lunevb8542722007-12-01 00:21:31 +1100735 return 0;
736
Thomas Graf4a89c252006-11-24 17:14:51 -0800737 skip_ndevs = cb->args[0];
738 skip_naddr = cb->args[1];
739
Pavel Emelianov7562f872007-05-03 15:13:45 -0700740 idx = 0;
Eric W. Biederman881d9662007-09-17 11:56:21 -0700741 for_each_netdev(&init_net, dev) {
Thomas Graf4a89c252006-11-24 17:14:51 -0800742 if (idx < skip_ndevs)
Pavel Emelianov7562f872007-05-03 15:13:45 -0700743 goto cont;
Thomas Graf4a89c252006-11-24 17:14:51 -0800744 else if (idx > skip_ndevs) {
745 /* Only skip over addresses for first dev dumped
746 * in this iteration (idx == skip_ndevs) */
747 skip_naddr = 0;
748 }
749
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 if ((dn_db = dev->dn_ptr) == NULL)
Pavel Emelianov7562f872007-05-03 15:13:45 -0700751 goto cont;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752
Thomas Graf4a89c252006-11-24 17:14:51 -0800753 for (ifa = dn_db->ifa_list, dn_idx = 0; ifa;
754 ifa = ifa->ifa_next, dn_idx++) {
755 if (dn_idx < skip_naddr)
Patrick McHardya2221f32007-09-11 10:45:15 +0200756 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757
Thomas Graf4a89c252006-11-24 17:14:51 -0800758 if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
759 cb->nlh->nlmsg_seq, RTM_NEWADDR,
760 NLM_F_MULTI) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 goto done;
762 }
Pavel Emelianov7562f872007-05-03 15:13:45 -0700763cont:
764 idx++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 }
766done:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 cb->args[0] = idx;
768 cb->args[1] = dn_idx;
769
770 return skb->len;
771}
772
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800773static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774{
775 struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
776 struct dn_ifaddr *ifa;
777 int rv = -ENODEV;
stephen hemminger41bdecf2009-11-11 07:39:27 +0000778
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 if (dn_db == NULL)
780 goto out;
stephen hemminger41bdecf2009-11-11 07:39:27 +0000781
782 rtnl_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783 ifa = dn_db->ifa_list;
784 if (ifa != NULL) {
785 *addr = ifa->ifa_local;
786 rv = 0;
787 }
stephen hemminger41bdecf2009-11-11 07:39:27 +0000788 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789out:
790 return rv;
791}
792
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900793/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794 * Find a default address to bind to.
795 *
796 * This is one of those areas where the initial VMS concepts don't really
797 * map onto the Linux concepts, and since we introduced multiple addresses
798 * per interface we have to cope with slightly odd ways of finding out what
799 * "our address" really is. Mostly it's not a problem; for this we just guess
800 * a sensible default. Eventually the routing code will take care of all the
801 * nasties for us I hope.
802 */
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800803int dn_dev_bind_default(__le16 *addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804{
805 struct net_device *dev;
806 int rv;
807 dev = dn_dev_get_default();
808last_chance:
809 if (dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 rv = dn_dev_get_first(dev, addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811 dev_put(dev);
Eric W. Biederman2774c7a2007-09-26 22:10:56 -0700812 if (rv == 0 || dev == init_net.loopback_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813 return rv;
814 }
Eric W. Biederman2774c7a2007-09-26 22:10:56 -0700815 dev = init_net.loopback_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816 dev_hold(dev);
817 goto last_chance;
818}
819
820static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
821{
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900822 struct endnode_hello_message *msg;
823 struct sk_buff *skb = NULL;
824 __le16 *pktlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825 struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
826
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900827 if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 return;
829
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900830 skb->dev = dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900832 msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900834 msg->msgflg = 0x0D;
835 memcpy(msg->tiver, dn_eco_version, 3);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836 dn_dn2eth(msg->id, ifa->ifa_local);
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900837 msg->iinfo = DN_RT_INFO_ENDN;
Harvey Harrisonc4106aa2008-11-27 00:12:47 -0800838 msg->blksize = cpu_to_le16(mtu2blksize(dev));
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900839 msg->area = 0x00;
840 memset(msg->seed, 0, 8);
841 memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842
843 if (dn_db->router) {
844 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
845 dn_dn2eth(msg->neighbor, dn->addr);
846 }
847
Harvey Harrisonc4106aa2008-11-27 00:12:47 -0800848 msg->timer = cpu_to_le16((unsigned short)dn_db->parms.t3);
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900849 msg->mpd = 0x00;
850 msg->datalen = 0x02;
851 memset(msg->data, 0xAA, 2);
852
853 pktlen = (__le16 *)skb_push(skb,2);
Harvey Harrisonc4106aa2008-11-27 00:12:47 -0800854 *pktlen = cpu_to_le16(skb->len - 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700856 skb_reset_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857
858 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
859}
860
861
862#define DRDELAY (5 * HZ)
863
864static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
865{
866 /* First check time since device went up */
867 if ((jiffies - dn_db->uptime) < DRDELAY)
868 return 0;
869
870 /* If there is no router, then yes... */
871 if (!dn_db->router)
872 return 1;
873
874 /* otherwise only if we have a higher priority or.. */
875 if (dn->priority < dn_db->parms.priority)
876 return 1;
877
878 /* if we have equal priority and a higher node number */
879 if (dn->priority != dn_db->parms.priority)
880 return 0;
881
Harvey Harrisonc4106aa2008-11-27 00:12:47 -0800882 if (le16_to_cpu(dn->addr) < le16_to_cpu(ifa->ifa_local))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 return 1;
884
885 return 0;
886}
887
888static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
889{
890 int n;
891 struct dn_dev *dn_db = dev->dn_ptr;
892 struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
893 struct sk_buff *skb;
894 size_t size;
895 unsigned char *ptr;
896 unsigned char *i1, *i2;
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800897 __le16 *pktlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898 char *src;
899
900 if (mtu2blksize(dev) < (26 + 7))
901 return;
902
903 n = mtu2blksize(dev) - 26;
904 n /= 7;
905
906 if (n > 32)
907 n = 32;
908
909 size = 2 + 26 + 7 * n;
910
911 if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
912 return;
913
914 skb->dev = dev;
915 ptr = skb_put(skb, size);
916
917 *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
918 *ptr++ = 2; /* ECO */
919 *ptr++ = 0;
920 *ptr++ = 0;
921 dn_dn2eth(ptr, ifa->ifa_local);
922 src = ptr;
923 ptr += ETH_ALEN;
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900924 *ptr++ = dn_db->parms.forwarding == 1 ?
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925 DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
Harvey Harrisonc4106aa2008-11-27 00:12:47 -0800926 *((__le16 *)ptr) = cpu_to_le16(mtu2blksize(dev));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927 ptr += 2;
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +0900928 *ptr++ = dn_db->parms.priority; /* Priority */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929 *ptr++ = 0; /* Area: Reserved */
Harvey Harrisonc4106aa2008-11-27 00:12:47 -0800930 *((__le16 *)ptr) = cpu_to_le16((unsigned short)dn_db->parms.t3);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 ptr += 2;
932 *ptr++ = 0; /* MPD: Reserved */
933 i1 = ptr++;
934 memset(ptr, 0, 7); /* Name: Reserved */
935 ptr += 7;
936 i2 = ptr++;
937
938 n = dn_neigh_elist(dev, ptr, n);
939
940 *i2 = 7 * n;
941 *i1 = 8 + *i2;
942
943 skb_trim(skb, (27 + *i2));
944
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800945 pktlen = (__le16 *)skb_push(skb, 2);
Harvey Harrisonc4106aa2008-11-27 00:12:47 -0800946 *pktlen = cpu_to_le16(skb->len - 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947
Arnaldo Carvalho de Meloc1d2bbe2007-04-10 20:45:18 -0700948 skb_reset_network_header(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949
950 if (dn_am_i_a_router(dn, dn_db, ifa)) {
951 struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
952 if (skb2) {
953 dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
954 }
955 }
956
957 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
958}
959
960static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
961{
962 struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
963
964 if (dn_db->parms.forwarding == 0)
965 dn_send_endnode_hello(dev, ifa);
966 else
967 dn_send_router_hello(dev, ifa);
968}
969
970static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
971{
972 int tdlen = 16;
973 int size = dev->hard_header_len + 2 + 4 + tdlen;
974 struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
975 int i;
976 unsigned char *ptr;
977 char src[ETH_ALEN];
978
979 if (skb == NULL)
980 return ;
981
982 skb->dev = dev;
983 skb_push(skb, dev->hard_header_len);
984 ptr = skb_put(skb, 2 + 4 + tdlen);
985
986 *ptr++ = DN_RT_PKT_HELO;
Steven Whitehousec4ea94a2006-03-20 22:42:39 -0800987 *((__le16 *)ptr) = ifa->ifa_local;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 ptr += 2;
989 *ptr++ = tdlen;
990
991 for(i = 0; i < tdlen; i++)
992 *ptr++ = 0252;
993
994 dn_dn2eth(src, ifa->ifa_local);
995 dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
996}
997
998static int dn_eth_up(struct net_device *dev)
999{
1000 struct dn_dev *dn_db = dev->dn_ptr;
1001
1002 if (dn_db->parms.forwarding == 0)
1003 dev_mc_add(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1004 else
1005 dev_mc_add(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1006
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007 dn_db->use_long = 1;
1008
1009 return 0;
1010}
1011
1012static void dn_eth_down(struct net_device *dev)
1013{
1014 struct dn_dev *dn_db = dev->dn_ptr;
1015
1016 if (dn_db->parms.forwarding == 0)
1017 dev_mc_delete(dev, dn_rt_all_end_mcast, ETH_ALEN, 0);
1018 else
1019 dev_mc_delete(dev, dn_rt_all_rt_mcast, ETH_ALEN, 0);
1020}
1021
1022static void dn_dev_set_timer(struct net_device *dev);
1023
1024static void dn_dev_timer_func(unsigned long arg)
1025{
1026 struct net_device *dev = (struct net_device *)arg;
1027 struct dn_dev *dn_db = dev->dn_ptr;
1028 struct dn_ifaddr *ifa;
1029
1030 if (dn_db->t3 <= dn_db->parms.t2) {
1031 if (dn_db->parms.timer3) {
1032 for(ifa = dn_db->ifa_list; ifa; ifa = ifa->ifa_next) {
1033 if (!(ifa->ifa_flags & IFA_F_SECONDARY))
1034 dn_db->parms.timer3(dev, ifa);
1035 }
1036 }
1037 dn_db->t3 = dn_db->parms.t3;
1038 } else {
1039 dn_db->t3 -= dn_db->parms.t2;
1040 }
1041
1042 dn_dev_set_timer(dev);
1043}
1044
1045static void dn_dev_set_timer(struct net_device *dev)
1046{
1047 struct dn_dev *dn_db = dev->dn_ptr;
1048
1049 if (dn_db->parms.t2 > dn_db->parms.t3)
1050 dn_db->parms.t2 = dn_db->parms.t3;
1051
1052 dn_db->timer.data = (unsigned long)dev;
1053 dn_db->timer.function = dn_dev_timer_func;
1054 dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
1055
1056 add_timer(&dn_db->timer);
1057}
1058
Roel Kluin5eaa65b2008-12-10 15:18:31 -08001059static struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001060{
1061 int i;
1062 struct dn_dev_parms *p = dn_dev_list;
1063 struct dn_dev *dn_db;
1064
1065 for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
1066 if (p->type == dev->type)
1067 break;
1068 }
1069
1070 *err = -ENODEV;
1071 if (i == DN_DEV_LIST_SIZE)
1072 return NULL;
1073
1074 *err = -ENOBUFS;
Panagiotis Issaris0da974f2006-07-21 14:51:30 -07001075 if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076 return NULL;
1077
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078 memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
1079 smp_wmb();
1080 dev->dn_ptr = dn_db;
1081 dn_db->dev = dev;
1082 init_timer(&dn_db->timer);
1083
1084 dn_db->uptime = jiffies;
Eric W. Biederman95743de2007-01-25 15:51:51 -08001085
1086 dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
1087 if (!dn_db->neigh_parms) {
1088 dev->dn_ptr = NULL;
1089 kfree(dn_db);
1090 return NULL;
1091 }
1092
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093 if (dn_db->parms.up) {
1094 if (dn_db->parms.up(dev) < 0) {
Eric W. Biederman95743de2007-01-25 15:51:51 -08001095 neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096 dev->dn_ptr = NULL;
1097 kfree(dn_db);
1098 return NULL;
1099 }
1100 }
1101
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102 dn_dev_sysctl_register(dev, &dn_db->parms);
1103
1104 dn_dev_set_timer(dev);
1105
1106 *err = 0;
1107 return dn_db;
1108}
1109
1110
1111/*
1112 * This processes a device up event. We only start up
1113 * the loopback device & ethernet devices with correct
1114 * MAC addreses automatically. Others must be started
1115 * specifically.
1116 *
1117 * FIXME: How should we configure the loopback address ? If we could dispense
1118 * with using decnet_address here and for autobind, it will be one less thing
1119 * for users to worry about setting up.
1120 */
1121
1122void dn_dev_up(struct net_device *dev)
1123{
1124 struct dn_ifaddr *ifa;
Steven Whitehousec4ea94a2006-03-20 22:42:39 -08001125 __le16 addr = decnet_address;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126 int maybe_default = 0;
1127 struct dn_dev *dn_db = (struct dn_dev *)dev->dn_ptr;
1128
1129 if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
1130 return;
1131
1132 /*
1133 * Need to ensure that loopback device has a dn_db attached to it
1134 * to allow creation of neighbours against it, even though it might
1135 * not have a local address of its own. Might as well do the same for
1136 * all autoconfigured interfaces.
1137 */
1138 if (dn_db == NULL) {
1139 int err;
1140 dn_db = dn_dev_create(dev, &err);
1141 if (dn_db == NULL)
1142 return;
1143 }
1144
1145 if (dev->type == ARPHRD_ETHER) {
1146 if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
1147 return;
Steven Whitehousec4ea94a2006-03-20 22:42:39 -08001148 addr = dn_eth2dn(dev->dev_addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149 maybe_default = 1;
1150 }
1151
1152 if (addr == 0)
1153 return;
1154
1155 if ((ifa = dn_dev_alloc_ifa()) == NULL)
1156 return;
1157
1158 ifa->ifa_local = ifa->ifa_address = addr;
1159 ifa->ifa_flags = 0;
1160 ifa->ifa_scope = RT_SCOPE_UNIVERSE;
1161 strcpy(ifa->ifa_label, dev->name);
1162
1163 dn_dev_set_ifa(dev, ifa);
1164
1165 /*
1166 * Automagically set the default device to the first automatically
1167 * configured ethernet card in the system.
1168 */
1169 if (maybe_default) {
1170 dev_hold(dev);
1171 if (dn_dev_set_default(dev, 0))
1172 dev_put(dev);
1173 }
1174}
1175
1176static void dn_dev_delete(struct net_device *dev)
1177{
1178 struct dn_dev *dn_db = dev->dn_ptr;
1179
1180 if (dn_db == NULL)
1181 return;
1182
1183 del_timer_sync(&dn_db->timer);
1184 dn_dev_sysctl_unregister(&dn_db->parms);
1185 dn_dev_check_default(dev);
1186 neigh_ifdown(&dn_neigh_table, dev);
1187
1188 if (dn_db->parms.down)
1189 dn_db->parms.down(dev);
1190
1191 dev->dn_ptr = NULL;
1192
1193 neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
1194 neigh_ifdown(&dn_neigh_table, dev);
1195
1196 if (dn_db->router)
1197 neigh_release(dn_db->router);
1198 if (dn_db->peer)
1199 neigh_release(dn_db->peer);
1200
1201 kfree(dn_db);
1202}
1203
1204void dn_dev_down(struct net_device *dev)
1205{
1206 struct dn_dev *dn_db = dev->dn_ptr;
1207 struct dn_ifaddr *ifa;
1208
1209 if (dn_db == NULL)
1210 return;
1211
1212 while((ifa = dn_db->ifa_list) != NULL) {
1213 dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
1214 dn_dev_free_ifa(ifa);
1215 }
1216
1217 dn_dev_delete(dev);
1218}
1219
1220void dn_dev_init_pkt(struct sk_buff *skb)
1221{
1222 return;
1223}
1224
1225void dn_dev_veri_pkt(struct sk_buff *skb)
1226{
1227 return;
1228}
1229
1230void dn_dev_hello(struct sk_buff *skb)
1231{
1232 return;
1233}
1234
1235void dn_dev_devices_off(void)
1236{
1237 struct net_device *dev;
1238
1239 rtnl_lock();
Eric W. Biederman881d9662007-09-17 11:56:21 -07001240 for_each_netdev(&init_net, dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241 dn_dev_down(dev);
1242 rtnl_unlock();
1243
1244}
1245
1246void dn_dev_devices_on(void)
1247{
1248 struct net_device *dev;
1249
1250 rtnl_lock();
Eric W. Biederman881d9662007-09-17 11:56:21 -07001251 for_each_netdev(&init_net, dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252 if (dev->flags & IFF_UP)
1253 dn_dev_up(dev);
1254 }
1255 rtnl_unlock();
1256}
1257
1258int register_dnaddr_notifier(struct notifier_block *nb)
1259{
Alan Sterne041c682006-03-27 01:16:30 -08001260 return blocking_notifier_chain_register(&dnaddr_chain, nb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261}
1262
1263int unregister_dnaddr_notifier(struct notifier_block *nb)
1264{
Alan Sterne041c682006-03-27 01:16:30 -08001265 return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266}
1267
1268#ifdef CONFIG_PROC_FS
Pavel Emelianov7562f872007-05-03 15:13:45 -07001269static inline int is_dn_dev(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270{
Pavel Emelianov7562f872007-05-03 15:13:45 -07001271 return dev->dn_ptr != NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272}
1273
1274static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
stephen hemmingerfa918602009-11-10 07:54:53 +00001275 __acquires(rcu)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276{
Pavel Emelianov7562f872007-05-03 15:13:45 -07001277 int i;
1278 struct net_device *dev;
1279
stephen hemmingerfa918602009-11-10 07:54:53 +00001280 rcu_read_lock();
Pavel Emelianov7562f872007-05-03 15:13:45 -07001281
1282 if (*pos == 0)
1283 return SEQ_START_TOKEN;
1284
1285 i = 1;
stephen hemmingerfa918602009-11-10 07:54:53 +00001286 for_each_netdev_rcu(&init_net, dev) {
Pavel Emelianov7562f872007-05-03 15:13:45 -07001287 if (!is_dn_dev(dev))
1288 continue;
1289
1290 if (i++ == *pos)
1291 return dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001292 }
Pavel Emelianov7562f872007-05-03 15:13:45 -07001293
1294 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295}
1296
1297static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1298{
Pavel Emelianov7562f872007-05-03 15:13:45 -07001299 struct net_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001300
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301 ++*pos;
Pavel Emelianov7562f872007-05-03 15:13:45 -07001302
1303 dev = (struct net_device *)v;
1304 if (v == SEQ_START_TOKEN)
Eric W. Biederman881d9662007-09-17 11:56:21 -07001305 dev = net_device_entry(&init_net.dev_base_head);
Pavel Emelianov7562f872007-05-03 15:13:45 -07001306
stephen hemmingerfa918602009-11-10 07:54:53 +00001307 for_each_netdev_continue_rcu(&init_net, dev) {
Pavel Emelianov7562f872007-05-03 15:13:45 -07001308 if (!is_dn_dev(dev))
1309 continue;
1310
1311 return dev;
1312 }
1313
1314 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001315}
1316
1317static void dn_dev_seq_stop(struct seq_file *seq, void *v)
stephen hemmingerfa918602009-11-10 07:54:53 +00001318 __releases(rcu)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319{
stephen hemmingerfa918602009-11-10 07:54:53 +00001320 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321}
1322
1323static char *dn_type2asc(char type)
1324{
1325 switch(type) {
1326 case DN_DEV_BCAST:
1327 return "B";
1328 case DN_DEV_UCAST:
1329 return "U";
1330 case DN_DEV_MPOINT:
1331 return "M";
1332 }
1333
1334 return "?";
1335}
1336
1337static int dn_dev_seq_show(struct seq_file *seq, void *v)
1338{
1339 if (v == SEQ_START_TOKEN)
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001340 seq_puts(seq, "Name Flags T1 Timer1 T3 Timer3 BlkSize Pri State DevType Router Peer\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341 else {
1342 struct net_device *dev = v;
1343 char peer_buf[DN_ASCBUF_LEN];
1344 char router_buf[DN_ASCBUF_LEN];
1345 struct dn_dev *dn_db = dev->dn_ptr;
1346
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001347 seq_printf(seq, "%-8s %1s %04u %04u %04lu %04lu"
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348 " %04hu %03d %02x %-10s %-7s %-7s\n",
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001349 dev->name ? dev->name : "???",
1350 dn_type2asc(dn_db->parms.mode),
1351 0, 0,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352 dn_db->t3, dn_db->parms.t3,
1353 mtu2blksize(dev),
1354 dn_db->parms.priority,
1355 dn_db->parms.state, dn_db->parms.name,
Harvey Harrisonc4106aa2008-11-27 00:12:47 -08001356 dn_db->router ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
1357 dn_db->peer ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001358 }
1359 return 0;
1360}
1361
Philippe De Muyter56b3d972007-07-10 23:07:31 -07001362static const struct seq_operations dn_dev_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363 .start = dn_dev_seq_start,
1364 .next = dn_dev_seq_next,
1365 .stop = dn_dev_seq_stop,
1366 .show = dn_dev_seq_show,
1367};
1368
1369static int dn_dev_seq_open(struct inode *inode, struct file *file)
1370{
1371 return seq_open(file, &dn_dev_seq_ops);
1372}
1373
Arjan van de Ven9a321442007-02-12 00:55:35 -08001374static const struct file_operations dn_dev_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001375 .owner = THIS_MODULE,
1376 .open = dn_dev_seq_open,
1377 .read = seq_read,
1378 .llseek = seq_lseek,
1379 .release = seq_release,
1380};
1381
1382#endif /* CONFIG_PROC_FS */
1383
Alexey Dobriyan4e058062007-11-05 21:30:11 -08001384static int addr[2];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385module_param_array(addr, int, NULL, 0444);
1386MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
1387
1388void __init dn_dev_init(void)
1389{
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001390 if (addr[0] > 63 || addr[0] < 0) {
1391 printk(KERN_ERR "DECnet: Area must be between 0 and 63");
1392 return;
1393 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001394
YOSHIFUJI Hideaki429eb0f2007-02-09 23:24:40 +09001395 if (addr[1] > 1023 || addr[1] < 0) {
1396 printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
1397 return;
1398 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399
Harvey Harrisonc4106aa2008-11-27 00:12:47 -08001400 decnet_address = cpu_to_le16((addr[0] << 10) | addr[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001401
1402 dn_dev_devices_on();
1403
Thomas Graffa34ddd2007-03-22 11:57:46 -07001404 rtnl_register(PF_DECnet, RTM_NEWADDR, dn_nl_newaddr, NULL);
1405 rtnl_register(PF_DECnet, RTM_DELADDR, dn_nl_deladdr, NULL);
1406 rtnl_register(PF_DECnet, RTM_GETADDR, NULL, dn_nl_dump_ifaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407
Eric W. Biederman457c4cb2007-09-12 12:01:34 +02001408 proc_net_fops_create(&init_net, "decnet_dev", S_IRUGO, &dn_dev_seq_fops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409
1410#ifdef CONFIG_SYSCTL
1411 {
1412 int i;
1413 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1414 dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
1415 }
1416#endif /* CONFIG_SYSCTL */
1417}
1418
1419void __exit dn_dev_cleanup(void)
1420{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001421#ifdef CONFIG_SYSCTL
1422 {
1423 int i;
1424 for(i = 0; i < DN_DEV_LIST_SIZE; i++)
1425 dn_dev_sysctl_unregister(&dn_dev_list[i]);
1426 }
1427#endif /* CONFIG_SYSCTL */
1428
Eric W. Biederman457c4cb2007-09-12 12:01:34 +02001429 proc_net_remove(&init_net, "decnet_dev");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430
1431 dn_dev_devices_off();
1432}