Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * DECnet An implementation of the DECnet protocol suite for the LINUX | |
4 | * operating system. DECnet is implemented using the BSD Socket | |
5 | * interface as the means of communication with the user level. | |
6 | * | |
7 | * DECnet Device Layer | |
8 | * | |
9 | * Authors: Steve Whitehouse <SteveW@ACM.org> | |
10 | * Eduardo Marcelo Serrat <emserrat@geocities.com> | |
11 | * | |
12 | * Changes: | |
13 | * Steve Whitehouse : Devices now see incoming frames so they | |
14 | * can mark on who it came from. | |
15 | * Steve Whitehouse : Fixed bug in creating neighbours. Each neighbour | |
16 | * can now have a device specific setup func. | |
17 | * Steve Whitehouse : Added /proc/sys/net/decnet/conf/<dev>/ | |
18 | * Steve Whitehouse : Fixed bug which sometimes killed timer | |
19 | * Steve Whitehouse : Multiple ifaddr support | |
20 | * Steve Whitehouse : SIOCGIFCONF is now a compile time option | |
21 | * Steve Whitehouse : /proc/sys/net/decnet/conf/<sys>/forwarding | |
22 | * Steve Whitehouse : Removed timer1 - it's a user space issue now | |
23 | * Patrick Caulfield : Fixed router hello message format | |
24 | * Steve Whitehouse : Got rid of constant sizes for blksize for | |
25 | * devices. All mtu based now. | |
26 | */ | |
27 | ||
4fc268d2 | 28 | #include <linux/capability.h> |
1da177e4 LT |
29 | #include <linux/module.h> |
30 | #include <linux/moduleparam.h> | |
31 | #include <linux/init.h> | |
32 | #include <linux/net.h> | |
33 | #include <linux/netdevice.h> | |
34 | #include <linux/proc_fs.h> | |
35 | #include <linux/seq_file.h> | |
36 | #include <linux/timer.h> | |
37 | #include <linux/string.h> | |
1823730f | 38 | #include <linux/if_addr.h> |
1da177e4 LT |
39 | #include <linux/if_arp.h> |
40 | #include <linux/if_ether.h> | |
41 | #include <linux/skbuff.h> | |
1da177e4 LT |
42 | #include <linux/sysctl.h> |
43 | #include <linux/notifier.h> | |
5a0e3ad6 | 44 | #include <linux/slab.h> |
b5c5c36d | 45 | #include <linux/jiffies.h> |
7c0f6ba6 | 46 | #include <linux/uaccess.h> |
457c4cbc | 47 | #include <net/net_namespace.h> |
1da177e4 LT |
48 | #include <net/neighbour.h> |
49 | #include <net/dst.h> | |
50 | #include <net/flow.h> | |
a8731cbf | 51 | #include <net/fib_rules.h> |
a6f01cac | 52 | #include <net/netlink.h> |
1da177e4 LT |
53 | #include <net/dn.h> |
54 | #include <net/dn_dev.h> | |
55 | #include <net/dn_route.h> | |
56 | #include <net/dn_neigh.h> | |
57 | #include <net/dn_fib.h> | |
58 | ||
59 | #define DN_IFREQ_SIZE (sizeof(struct ifreq) - sizeof(struct sockaddr) + sizeof(struct sockaddr_dn)) | |
60 | ||
61 | static char dn_rt_all_end_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x04,0x00,0x00}; | |
62 | static char dn_rt_all_rt_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x03,0x00,0x00}; | |
63 | static char dn_hiord[ETH_ALEN] = {0xAA,0x00,0x04,0x00,0x00,0x00}; | |
64 | static unsigned char dn_eco_version[3] = {0x02,0x00,0x00}; | |
65 | ||
66 | extern struct neigh_table dn_neigh_table; | |
67 | ||
68 | /* | |
69 | * decnet_address is kept in network order. | |
70 | */ | |
c4ea94ab | 71 | __le16 decnet_address = 0; |
1da177e4 | 72 | |
e5c140a3 | 73 | static DEFINE_SPINLOCK(dndev_lock); |
1da177e4 | 74 | static struct net_device *decnet_default_device; |
e041c683 | 75 | static BLOCKING_NOTIFIER_HEAD(dnaddr_chain); |
1da177e4 LT |
76 | |
77 | static struct dn_dev *dn_dev_create(struct net_device *dev, int *err); | |
78 | static void dn_dev_delete(struct net_device *dev); | |
b020b942 | 79 | static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa); |
1da177e4 LT |
80 | |
81 | static int dn_eth_up(struct net_device *); | |
82 | static void dn_eth_down(struct net_device *); | |
83 | static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa); | |
84 | static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa); | |
85 | ||
86 | static struct dn_dev_parms dn_dev_list[] = { | |
87 | { | |
88 | .type = ARPHRD_ETHER, /* Ethernet */ | |
89 | .mode = DN_DEV_BCAST, | |
90 | .state = DN_DEV_S_RU, | |
91 | .t2 = 1, | |
92 | .t3 = 10, | |
93 | .name = "ethernet", | |
1da177e4 LT |
94 | .up = dn_eth_up, |
95 | .down = dn_eth_down, | |
96 | .timer3 = dn_send_brd_hello, | |
97 | }, | |
98 | { | |
99 | .type = ARPHRD_IPGRE, /* DECnet tunneled over GRE in IP */ | |
100 | .mode = DN_DEV_BCAST, | |
101 | .state = DN_DEV_S_RU, | |
102 | .t2 = 1, | |
103 | .t3 = 10, | |
104 | .name = "ipgre", | |
1da177e4 LT |
105 | .timer3 = dn_send_brd_hello, |
106 | }, | |
107 | #if 0 | |
108 | { | |
109 | .type = ARPHRD_X25, /* Bog standard X.25 */ | |
110 | .mode = DN_DEV_UCAST, | |
111 | .state = DN_DEV_S_DS, | |
112 | .t2 = 1, | |
113 | .t3 = 120, | |
114 | .name = "x25", | |
1da177e4 LT |
115 | .timer3 = dn_send_ptp_hello, |
116 | }, | |
117 | #endif | |
118 | #if 0 | |
119 | { | |
120 | .type = ARPHRD_PPP, /* DECnet over PPP */ | |
121 | .mode = DN_DEV_BCAST, | |
122 | .state = DN_DEV_S_RU, | |
123 | .t2 = 1, | |
124 | .t3 = 10, | |
125 | .name = "ppp", | |
1da177e4 LT |
126 | .timer3 = dn_send_brd_hello, |
127 | }, | |
128 | #endif | |
129 | { | |
130 | .type = ARPHRD_DDCMP, /* DECnet over DDCMP */ | |
131 | .mode = DN_DEV_UCAST, | |
132 | .state = DN_DEV_S_DS, | |
133 | .t2 = 1, | |
134 | .t3 = 120, | |
135 | .name = "ddcmp", | |
1da177e4 LT |
136 | .timer3 = dn_send_ptp_hello, |
137 | }, | |
138 | { | |
139 | .type = ARPHRD_LOOPBACK, /* Loopback interface - always last */ | |
140 | .mode = DN_DEV_BCAST, | |
141 | .state = DN_DEV_S_RU, | |
142 | .t2 = 1, | |
143 | .t3 = 10, | |
144 | .name = "loopback", | |
1da177e4 LT |
145 | .timer3 = dn_send_brd_hello, |
146 | } | |
147 | }; | |
148 | ||
8b14a536 | 149 | #define DN_DEV_LIST_SIZE ARRAY_SIZE(dn_dev_list) |
1da177e4 | 150 | |
8fa0b315 | 151 | #define DN_DEV_PARMS_OFFSET(x) offsetof(struct dn_dev_parms, x) |
1da177e4 LT |
152 | |
153 | #ifdef CONFIG_SYSCTL | |
154 | ||
155 | static int min_t2[] = { 1 }; | |
156 | static int max_t2[] = { 60 }; /* No max specified, but this seems sensible */ | |
157 | static int min_t3[] = { 1 }; | |
158 | static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MULT or T3MULT */ | |
159 | ||
160 | static int min_priority[1]; | |
161 | static int max_priority[] = { 127 }; /* From DECnet spec */ | |
162 | ||
fe2c6338 | 163 | static int dn_forwarding_proc(struct ctl_table *, int, |
1da177e4 | 164 | void __user *, size_t *, loff_t *); |
1da177e4 LT |
165 | static struct dn_dev_sysctl_table { |
166 | struct ctl_table_header *sysctl_header; | |
fe2c6338 | 167 | struct ctl_table dn_dev_vars[5]; |
1da177e4 LT |
168 | } dn_dev_sysctl = { |
169 | NULL, | |
170 | { | |
171 | { | |
1da177e4 LT |
172 | .procname = "forwarding", |
173 | .data = (void *)DN_DEV_PARMS_OFFSET(forwarding), | |
174 | .maxlen = sizeof(int), | |
175 | .mode = 0644, | |
176 | .proc_handler = dn_forwarding_proc, | |
1da177e4 LT |
177 | }, |
178 | { | |
1da177e4 LT |
179 | .procname = "priority", |
180 | .data = (void *)DN_DEV_PARMS_OFFSET(priority), | |
181 | .maxlen = sizeof(int), | |
182 | .mode = 0644, | |
183 | .proc_handler = proc_dointvec_minmax, | |
1da177e4 LT |
184 | .extra1 = &min_priority, |
185 | .extra2 = &max_priority | |
186 | }, | |
187 | { | |
1da177e4 LT |
188 | .procname = "t2", |
189 | .data = (void *)DN_DEV_PARMS_OFFSET(t2), | |
190 | .maxlen = sizeof(int), | |
191 | .mode = 0644, | |
192 | .proc_handler = proc_dointvec_minmax, | |
1da177e4 LT |
193 | .extra1 = &min_t2, |
194 | .extra2 = &max_t2 | |
195 | }, | |
196 | { | |
1da177e4 LT |
197 | .procname = "t3", |
198 | .data = (void *)DN_DEV_PARMS_OFFSET(t3), | |
199 | .maxlen = sizeof(int), | |
200 | .mode = 0644, | |
201 | .proc_handler = proc_dointvec_minmax, | |
1da177e4 LT |
202 | .extra1 = &min_t3, |
203 | .extra2 = &max_t3 | |
204 | }, | |
9d1c0ca5 | 205 | { } |
1da177e4 | 206 | }, |
1da177e4 LT |
207 | }; |
208 | ||
209 | static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms) | |
210 | { | |
211 | struct dn_dev_sysctl_table *t; | |
212 | int i; | |
213 | ||
9bdcc88f | 214 | char path[sizeof("net/decnet/conf/") + IFNAMSIZ]; |
3151a9ab | 215 | |
c66b721a | 216 | t = kmemdup(&dn_dev_sysctl, sizeof(*t), GFP_KERNEL); |
1da177e4 LT |
217 | if (t == NULL) |
218 | return; | |
219 | ||
1da177e4 LT |
220 | for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) { |
221 | long offset = (long)t->dn_dev_vars[i].data; | |
222 | t->dn_dev_vars[i].data = ((char *)parms) + offset; | |
1da177e4 LT |
223 | } |
224 | ||
9bdcc88f EB |
225 | snprintf(path, sizeof(path), "net/decnet/conf/%s", |
226 | dev? dev->name : parms->name); | |
1da177e4 | 227 | |
1da177e4 LT |
228 | t->dn_dev_vars[0].extra1 = (void *)dev; |
229 | ||
9bdcc88f | 230 | t->sysctl_header = register_net_sysctl(&init_net, path, t->dn_dev_vars); |
1da177e4 LT |
231 | if (t->sysctl_header == NULL) |
232 | kfree(t); | |
233 | else | |
234 | parms->sysctl = t; | |
235 | } | |
236 | ||
237 | static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms) | |
238 | { | |
239 | if (parms->sysctl) { | |
240 | struct dn_dev_sysctl_table *t = parms->sysctl; | |
241 | parms->sysctl = NULL; | |
5dd3df10 | 242 | unregister_net_sysctl_table(t->sysctl_header); |
1da177e4 LT |
243 | kfree(t); |
244 | } | |
245 | } | |
246 | ||
fe2c6338 | 247 | static int dn_forwarding_proc(struct ctl_table *table, int write, |
1da177e4 LT |
248 | void __user *buffer, |
249 | size_t *lenp, loff_t *ppos) | |
250 | { | |
251 | #ifdef CONFIG_DECNET_ROUTER | |
252 | struct net_device *dev = table->extra1; | |
253 | struct dn_dev *dn_db; | |
254 | int err; | |
255 | int tmp, old; | |
256 | ||
257 | if (table->extra1 == NULL) | |
258 | return -EINVAL; | |
259 | ||
fc766e4c | 260 | dn_db = rcu_dereference_raw(dev->dn_ptr); |
1da177e4 LT |
261 | old = dn_db->parms.forwarding; |
262 | ||
8d65af78 | 263 | err = proc_dointvec(table, write, buffer, lenp, ppos); |
1da177e4 LT |
264 | |
265 | if ((err >= 0) && write) { | |
266 | if (dn_db->parms.forwarding < 0) | |
267 | dn_db->parms.forwarding = 0; | |
268 | if (dn_db->parms.forwarding > 2) | |
269 | dn_db->parms.forwarding = 2; | |
270 | /* | |
271 | * What an ugly hack this is... its works, just. It | |
272 | * would be nice if sysctl/proc were just that little | |
273 | * bit more flexible so I don't have to write a special | |
274 | * routine, or suffer hacks like this - SJW | |
275 | */ | |
276 | tmp = dn_db->parms.forwarding; | |
277 | dn_db->parms.forwarding = old; | |
278 | if (dn_db->parms.down) | |
279 | dn_db->parms.down(dev); | |
280 | dn_db->parms.forwarding = tmp; | |
281 | if (dn_db->parms.up) | |
282 | dn_db->parms.up(dev); | |
283 | } | |
284 | ||
285 | return err; | |
286 | #else | |
287 | return -EINVAL; | |
288 | #endif | |
289 | } | |
290 | ||
1da177e4 LT |
291 | #else /* CONFIG_SYSCTL */ |
292 | static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms) | |
293 | { | |
294 | } | |
295 | static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms) | |
296 | { | |
297 | } | |
298 | ||
299 | #endif /* CONFIG_SYSCTL */ | |
300 | ||
301 | static inline __u16 mtu2blksize(struct net_device *dev) | |
302 | { | |
303 | u32 blksize = dev->mtu; | |
304 | if (blksize > 0xffff) | |
305 | blksize = 0xffff; | |
306 | ||
307 | if (dev->type == ARPHRD_ETHER || | |
308 | dev->type == ARPHRD_PPP || | |
309 | dev->type == ARPHRD_IPGRE || | |
310 | dev->type == ARPHRD_LOOPBACK) | |
311 | blksize -= 2; | |
312 | ||
313 | return (__u16)blksize; | |
314 | } | |
315 | ||
316 | static struct dn_ifaddr *dn_dev_alloc_ifa(void) | |
317 | { | |
318 | struct dn_ifaddr *ifa; | |
319 | ||
0da974f4 | 320 | ifa = kzalloc(sizeof(*ifa), GFP_KERNEL); |
1da177e4 LT |
321 | |
322 | return ifa; | |
323 | } | |
324 | ||
fc766e4c | 325 | static void dn_dev_free_ifa(struct dn_ifaddr *ifa) |
1da177e4 | 326 | { |
1e547757 | 327 | kfree_rcu(ifa, rcu); |
fc766e4c ED |
328 | } |
329 | ||
330 | static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr __rcu **ifap, int destroy) | |
331 | { | |
332 | struct dn_ifaddr *ifa1 = rtnl_dereference(*ifap); | |
1da177e4 LT |
333 | unsigned char mac_addr[6]; |
334 | struct net_device *dev = dn_db->dev; | |
335 | ||
336 | ASSERT_RTNL(); | |
337 | ||
338 | *ifap = ifa1->ifa_next; | |
339 | ||
340 | if (dn_db->dev->type == ARPHRD_ETHER) { | |
c4ea94ab | 341 | if (ifa1->ifa_local != dn_eth2dn(dev->dev_addr)) { |
1da177e4 | 342 | dn_dn2eth(mac_addr, ifa1->ifa_local); |
22bedad3 | 343 | dev_mc_del(dev, mac_addr); |
1da177e4 LT |
344 | } |
345 | } | |
346 | ||
b020b942 | 347 | dn_ifaddr_notify(RTM_DELADDR, ifa1); |
e041c683 | 348 | blocking_notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1); |
1da177e4 LT |
349 | if (destroy) { |
350 | dn_dev_free_ifa(ifa1); | |
351 | ||
352 | if (dn_db->ifa_list == NULL) | |
353 | dn_dev_delete(dn_db->dev); | |
354 | } | |
355 | } | |
356 | ||
357 | static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa) | |
358 | { | |
359 | struct net_device *dev = dn_db->dev; | |
360 | struct dn_ifaddr *ifa1; | |
361 | unsigned char mac_addr[6]; | |
362 | ||
363 | ASSERT_RTNL(); | |
364 | ||
429eb0fa | 365 | /* Check for duplicates */ |
fc766e4c ED |
366 | for (ifa1 = rtnl_dereference(dn_db->ifa_list); |
367 | ifa1 != NULL; | |
368 | ifa1 = rtnl_dereference(ifa1->ifa_next)) { | |
1da177e4 LT |
369 | if (ifa1->ifa_local == ifa->ifa_local) |
370 | return -EEXIST; | |
371 | } | |
372 | ||
373 | if (dev->type == ARPHRD_ETHER) { | |
c4ea94ab | 374 | if (ifa->ifa_local != dn_eth2dn(dev->dev_addr)) { |
1da177e4 | 375 | dn_dn2eth(mac_addr, ifa->ifa_local); |
22bedad3 | 376 | dev_mc_add(dev, mac_addr); |
1da177e4 LT |
377 | } |
378 | } | |
379 | ||
380 | ifa->ifa_next = dn_db->ifa_list; | |
cf778b00 | 381 | rcu_assign_pointer(dn_db->ifa_list, ifa); |
1da177e4 | 382 | |
b020b942 | 383 | dn_ifaddr_notify(RTM_NEWADDR, ifa); |
e041c683 | 384 | blocking_notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa); |
1da177e4 LT |
385 | |
386 | return 0; | |
387 | } | |
388 | ||
389 | static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa) | |
390 | { | |
fc766e4c | 391 | struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr); |
1da177e4 LT |
392 | int rv; |
393 | ||
394 | if (dn_db == NULL) { | |
395 | int err; | |
396 | dn_db = dn_dev_create(dev, &err); | |
397 | if (dn_db == NULL) | |
398 | return err; | |
399 | } | |
400 | ||
401 | ifa->ifa_dev = dn_db; | |
402 | ||
403 | if (dev->flags & IFF_LOOPBACK) | |
404 | ifa->ifa_scope = RT_SCOPE_HOST; | |
405 | ||
406 | rv = dn_dev_insert_ifa(dn_db, ifa); | |
407 | if (rv) | |
408 | dn_dev_free_ifa(ifa); | |
409 | return rv; | |
410 | } | |
411 | ||
412 | ||
413 | int dn_dev_ioctl(unsigned int cmd, void __user *arg) | |
414 | { | |
415 | char buffer[DN_IFREQ_SIZE]; | |
416 | struct ifreq *ifr = (struct ifreq *)buffer; | |
417 | struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr; | |
418 | struct dn_dev *dn_db; | |
419 | struct net_device *dev; | |
fc766e4c ED |
420 | struct dn_ifaddr *ifa = NULL; |
421 | struct dn_ifaddr __rcu **ifap = NULL; | |
1da177e4 LT |
422 | int ret = 0; |
423 | ||
424 | if (copy_from_user(ifr, arg, DN_IFREQ_SIZE)) | |
425 | return -EFAULT; | |
426 | ifr->ifr_name[IFNAMSIZ-1] = 0; | |
427 | ||
881d966b | 428 | dev_load(&init_net, ifr->ifr_name); |
1da177e4 | 429 | |
06f8fe11 JP |
430 | switch (cmd) { |
431 | case SIOCGIFADDR: | |
432 | break; | |
433 | case SIOCSIFADDR: | |
434 | if (!capable(CAP_NET_ADMIN)) | |
435 | return -EACCES; | |
436 | if (sdn->sdn_family != AF_DECnet) | |
1da177e4 | 437 | return -EINVAL; |
06f8fe11 JP |
438 | break; |
439 | default: | |
440 | return -EINVAL; | |
1da177e4 LT |
441 | } |
442 | ||
443 | rtnl_lock(); | |
444 | ||
881d966b | 445 | if ((dev = __dev_get_by_name(&init_net, ifr->ifr_name)) == NULL) { |
1da177e4 LT |
446 | ret = -ENODEV; |
447 | goto done; | |
448 | } | |
449 | ||
fc766e4c ED |
450 | if ((dn_db = rtnl_dereference(dev->dn_ptr)) != NULL) { |
451 | for (ifap = &dn_db->ifa_list; | |
452 | (ifa = rtnl_dereference(*ifap)) != NULL; | |
453 | ifap = &ifa->ifa_next) | |
1da177e4 LT |
454 | if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0) |
455 | break; | |
456 | } | |
457 | ||
458 | if (ifa == NULL && cmd != SIOCSIFADDR) { | |
459 | ret = -EADDRNOTAVAIL; | |
460 | goto done; | |
461 | } | |
462 | ||
06f8fe11 JP |
463 | switch (cmd) { |
464 | case SIOCGIFADDR: | |
465 | *((__le16 *)sdn->sdn_nodeaddr) = ifa->ifa_local; | |
466 | goto rarok; | |
467 | ||
468 | case SIOCSIFADDR: | |
469 | if (!ifa) { | |
470 | if ((ifa = dn_dev_alloc_ifa()) == NULL) { | |
471 | ret = -ENOBUFS; | |
472 | break; | |
1da177e4 | 473 | } |
06f8fe11 JP |
474 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); |
475 | } else { | |
476 | if (ifa->ifa_local == dn_saddr2dn(sdn)) | |
477 | break; | |
478 | dn_dev_del_ifa(dn_db, ifap, 0); | |
479 | } | |
1da177e4 | 480 | |
06f8fe11 | 481 | ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn); |
1da177e4 | 482 | |
06f8fe11 | 483 | ret = dn_dev_set_ifa(dev, ifa); |
1da177e4 LT |
484 | } |
485 | done: | |
486 | rtnl_unlock(); | |
487 | ||
488 | return ret; | |
489 | rarok: | |
490 | if (copy_to_user(arg, ifr, DN_IFREQ_SIZE)) | |
491 | ret = -EFAULT; | |
492 | goto done; | |
493 | } | |
494 | ||
495 | struct net_device *dn_dev_get_default(void) | |
496 | { | |
497 | struct net_device *dev; | |
e5c140a3 | 498 | |
499 | spin_lock(&dndev_lock); | |
1da177e4 LT |
500 | dev = decnet_default_device; |
501 | if (dev) { | |
502 | if (dev->dn_ptr) | |
503 | dev_hold(dev); | |
504 | else | |
505 | dev = NULL; | |
506 | } | |
e5c140a3 | 507 | spin_unlock(&dndev_lock); |
508 | ||
1da177e4 LT |
509 | return dev; |
510 | } | |
511 | ||
512 | int dn_dev_set_default(struct net_device *dev, int force) | |
513 | { | |
514 | struct net_device *old = NULL; | |
515 | int rv = -EBUSY; | |
516 | if (!dev->dn_ptr) | |
517 | return -ENODEV; | |
e5c140a3 | 518 | |
519 | spin_lock(&dndev_lock); | |
1da177e4 LT |
520 | if (force || decnet_default_device == NULL) { |
521 | old = decnet_default_device; | |
522 | decnet_default_device = dev; | |
523 | rv = 0; | |
524 | } | |
e5c140a3 | 525 | spin_unlock(&dndev_lock); |
526 | ||
1da177e4 | 527 | if (old) |
6a57b2ee | 528 | dev_put(old); |
1da177e4 LT |
529 | return rv; |
530 | } | |
531 | ||
532 | static void dn_dev_check_default(struct net_device *dev) | |
533 | { | |
e5c140a3 | 534 | spin_lock(&dndev_lock); |
1da177e4 LT |
535 | if (dev == decnet_default_device) { |
536 | decnet_default_device = NULL; | |
537 | } else { | |
538 | dev = NULL; | |
539 | } | |
e5c140a3 | 540 | spin_unlock(&dndev_lock); |
541 | ||
1da177e4 LT |
542 | if (dev) |
543 | dev_put(dev); | |
544 | } | |
545 | ||
b4d745db ED |
546 | /* |
547 | * Called with RTNL | |
548 | */ | |
1da177e4 LT |
549 | static struct dn_dev *dn_dev_by_index(int ifindex) |
550 | { | |
551 | struct net_device *dev; | |
552 | struct dn_dev *dn_dev = NULL; | |
b4d745db ED |
553 | |
554 | dev = __dev_get_by_index(&init_net, ifindex); | |
555 | if (dev) | |
fc766e4c | 556 | dn_dev = rtnl_dereference(dev->dn_ptr); |
1da177e4 LT |
557 | |
558 | return dn_dev; | |
559 | } | |
560 | ||
ef7c79ed | 561 | static const struct nla_policy dn_ifa_policy[IFA_MAX+1] = { |
4a89c256 TG |
562 | [IFA_ADDRESS] = { .type = NLA_U16 }, |
563 | [IFA_LOCAL] = { .type = NLA_U16 }, | |
564 | [IFA_LABEL] = { .type = NLA_STRING, | |
565 | .len = IFNAMSIZ - 1 }, | |
9a32b860 | 566 | [IFA_FLAGS] = { .type = NLA_U32 }, |
4a89c256 TG |
567 | }; |
568 | ||
c21ef3e3 DA |
569 | static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, |
570 | struct netlink_ext_ack *extack) | |
1da177e4 | 571 | { |
3b1e0a65 | 572 | struct net *net = sock_net(skb->sk); |
4a89c256 | 573 | struct nlattr *tb[IFA_MAX+1]; |
1da177e4 | 574 | struct dn_dev *dn_db; |
4a89c256 | 575 | struct ifaddrmsg *ifm; |
fc766e4c ED |
576 | struct dn_ifaddr *ifa; |
577 | struct dn_ifaddr __rcu **ifap; | |
b854272b DL |
578 | int err = -EINVAL; |
579 | ||
90f62cf3 | 580 | if (!netlink_capable(skb, CAP_NET_ADMIN)) |
dfc47ef8 EB |
581 | return -EPERM; |
582 | ||
09ad9bc7 | 583 | if (!net_eq(net, &init_net)) |
b854272b | 584 | goto errout; |
4a89c256 | 585 | |
c21ef3e3 DA |
586 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy, |
587 | extack); | |
4a89c256 TG |
588 | if (err < 0) |
589 | goto errout; | |
1da177e4 | 590 | |
3ccd8624 | 591 | err = -ENODEV; |
4a89c256 | 592 | ifm = nlmsg_data(nlh); |
1da177e4 | 593 | if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL) |
4a89c256 TG |
594 | goto errout; |
595 | ||
3ccd8624 | 596 | err = -EADDRNOTAVAIL; |
fc766e4c ED |
597 | for (ifap = &dn_db->ifa_list; |
598 | (ifa = rtnl_dereference(*ifap)) != NULL; | |
599 | ifap = &ifa->ifa_next) { | |
4a89c256 TG |
600 | if (tb[IFA_LOCAL] && |
601 | nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2)) | |
602 | continue; | |
1da177e4 | 603 | |
4a89c256 | 604 | if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label)) |
1da177e4 LT |
605 | continue; |
606 | ||
607 | dn_dev_del_ifa(dn_db, ifap, 1); | |
608 | return 0; | |
609 | } | |
610 | ||
4a89c256 TG |
611 | errout: |
612 | return err; | |
1da177e4 LT |
613 | } |
614 | ||
c21ef3e3 DA |
615 | static int dn_nl_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, |
616 | struct netlink_ext_ack *extack) | |
1da177e4 | 617 | { |
3b1e0a65 | 618 | struct net *net = sock_net(skb->sk); |
4a89c256 | 619 | struct nlattr *tb[IFA_MAX+1]; |
1da177e4 LT |
620 | struct net_device *dev; |
621 | struct dn_dev *dn_db; | |
4a89c256 | 622 | struct ifaddrmsg *ifm; |
1da177e4 | 623 | struct dn_ifaddr *ifa; |
4a89c256 TG |
624 | int err; |
625 | ||
90f62cf3 | 626 | if (!netlink_capable(skb, CAP_NET_ADMIN)) |
dfc47ef8 EB |
627 | return -EPERM; |
628 | ||
09ad9bc7 | 629 | if (!net_eq(net, &init_net)) |
b854272b DL |
630 | return -EINVAL; |
631 | ||
c21ef3e3 DA |
632 | err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy, |
633 | extack); | |
4a89c256 TG |
634 | if (err < 0) |
635 | return err; | |
1da177e4 | 636 | |
4a89c256 | 637 | if (tb[IFA_LOCAL] == NULL) |
1da177e4 LT |
638 | return -EINVAL; |
639 | ||
4a89c256 | 640 | ifm = nlmsg_data(nlh); |
881d966b | 641 | if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL) |
1da177e4 LT |
642 | return -ENODEV; |
643 | ||
fc766e4c | 644 | if ((dn_db = rtnl_dereference(dev->dn_ptr)) == NULL) { |
1da177e4 LT |
645 | dn_db = dn_dev_create(dev, &err); |
646 | if (!dn_db) | |
647 | return err; | |
648 | } | |
429eb0fa | 649 | |
1da177e4 LT |
650 | if ((ifa = dn_dev_alloc_ifa()) == NULL) |
651 | return -ENOBUFS; | |
652 | ||
4a89c256 TG |
653 | if (tb[IFA_ADDRESS] == NULL) |
654 | tb[IFA_ADDRESS] = tb[IFA_LOCAL]; | |
655 | ||
656 | ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]); | |
657 | ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]); | |
9a32b860 JP |
658 | ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : |
659 | ifm->ifa_flags; | |
1da177e4 LT |
660 | ifa->ifa_scope = ifm->ifa_scope; |
661 | ifa->ifa_dev = dn_db; | |
4a89c256 TG |
662 | |
663 | if (tb[IFA_LABEL]) | |
664 | nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ); | |
1da177e4 LT |
665 | else |
666 | memcpy(ifa->ifa_label, dev->name, IFNAMSIZ); | |
667 | ||
4a89c256 TG |
668 | err = dn_dev_insert_ifa(dn_db, ifa); |
669 | if (err) | |
1da177e4 | 670 | dn_dev_free_ifa(ifa); |
4a89c256 TG |
671 | |
672 | return err; | |
1da177e4 LT |
673 | } |
674 | ||
a6f01cac TG |
675 | static inline size_t dn_ifaddr_nlmsg_size(void) |
676 | { | |
677 | return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) | |
678 | + nla_total_size(IFNAMSIZ) /* IFA_LABEL */ | |
679 | + nla_total_size(2) /* IFA_ADDRESS */ | |
9a32b860 JP |
680 | + nla_total_size(2) /* IFA_LOCAL */ |
681 | + nla_total_size(4); /* IFA_FLAGS */ | |
a6f01cac TG |
682 | } |
683 | ||
4a89c256 | 684 | static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa, |
15e47304 | 685 | u32 portid, u32 seq, int event, unsigned int flags) |
1da177e4 LT |
686 | { |
687 | struct ifaddrmsg *ifm; | |
688 | struct nlmsghdr *nlh; | |
9a32b860 | 689 | u32 ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT; |
1da177e4 | 690 | |
15e47304 | 691 | nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags); |
4a89c256 | 692 | if (nlh == NULL) |
26932566 | 693 | return -EMSGSIZE; |
1da177e4 | 694 | |
4a89c256 | 695 | ifm = nlmsg_data(nlh); |
1da177e4 LT |
696 | ifm->ifa_family = AF_DECnet; |
697 | ifm->ifa_prefixlen = 16; | |
9a32b860 | 698 | ifm->ifa_flags = ifa_flags; |
1da177e4 LT |
699 | ifm->ifa_scope = ifa->ifa_scope; |
700 | ifm->ifa_index = ifa->ifa_dev->dev->ifindex; | |
4a89c256 | 701 | |
b21dddb9 DM |
702 | if ((ifa->ifa_address && |
703 | nla_put_le16(skb, IFA_ADDRESS, ifa->ifa_address)) || | |
704 | (ifa->ifa_local && | |
705 | nla_put_le16(skb, IFA_LOCAL, ifa->ifa_local)) || | |
706 | (ifa->ifa_label[0] && | |
9a32b860 JP |
707 | nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) || |
708 | nla_put_u32(skb, IFA_FLAGS, ifa_flags)) | |
b21dddb9 | 709 | goto nla_put_failure; |
053c095a JB |
710 | nlmsg_end(skb, nlh); |
711 | return 0; | |
4a89c256 TG |
712 | |
713 | nla_put_failure: | |
26932566 PM |
714 | nlmsg_cancel(skb, nlh); |
715 | return -EMSGSIZE; | |
1da177e4 LT |
716 | } |
717 | ||
b020b942 | 718 | static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa) |
1da177e4 LT |
719 | { |
720 | struct sk_buff *skb; | |
dc738dd8 | 721 | int err = -ENOBUFS; |
1da177e4 | 722 | |
a6f01cac | 723 | skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL); |
dc738dd8 TG |
724 | if (skb == NULL) |
725 | goto errout; | |
726 | ||
4a89c256 | 727 | err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0); |
26932566 PM |
728 | if (err < 0) { |
729 | /* -EMSGSIZE implies BUG in dn_ifaddr_nlmsg_size() */ | |
730 | WARN_ON(err == -EMSGSIZE); | |
731 | kfree_skb(skb); | |
732 | goto errout; | |
733 | } | |
1ce85fe4 PNA |
734 | rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL); |
735 | return; | |
dc738dd8 TG |
736 | errout: |
737 | if (err < 0) | |
97c53cac | 738 | rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err); |
1da177e4 LT |
739 | } |
740 | ||
4a89c256 | 741 | static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) |
1da177e4 | 742 | { |
3b1e0a65 | 743 | struct net *net = sock_net(skb->sk); |
4a89c256 | 744 | int idx, dn_idx = 0, skip_ndevs, skip_naddr; |
1da177e4 LT |
745 | struct net_device *dev; |
746 | struct dn_dev *dn_db; | |
747 | struct dn_ifaddr *ifa; | |
748 | ||
09ad9bc7 | 749 | if (!net_eq(net, &init_net)) |
b854272b DL |
750 | return 0; |
751 | ||
4a89c256 TG |
752 | skip_ndevs = cb->args[0]; |
753 | skip_naddr = cb->args[1]; | |
754 | ||
7562f876 | 755 | idx = 0; |
e67f88dd ED |
756 | rcu_read_lock(); |
757 | for_each_netdev_rcu(&init_net, dev) { | |
4a89c256 | 758 | if (idx < skip_ndevs) |
7562f876 | 759 | goto cont; |
4a89c256 TG |
760 | else if (idx > skip_ndevs) { |
761 | /* Only skip over addresses for first dev dumped | |
762 | * in this iteration (idx == skip_ndevs) */ | |
763 | skip_naddr = 0; | |
764 | } | |
765 | ||
e67f88dd | 766 | if ((dn_db = rcu_dereference(dev->dn_ptr)) == NULL) |
7562f876 | 767 | goto cont; |
1da177e4 | 768 | |
e67f88dd ED |
769 | for (ifa = rcu_dereference(dn_db->ifa_list), dn_idx = 0; ifa; |
770 | ifa = rcu_dereference(ifa->ifa_next), dn_idx++) { | |
4a89c256 | 771 | if (dn_idx < skip_naddr) |
a2221f30 | 772 | continue; |
1da177e4 | 773 | |
15e47304 | 774 | if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).portid, |
4a89c256 TG |
775 | cb->nlh->nlmsg_seq, RTM_NEWADDR, |
776 | NLM_F_MULTI) < 0) | |
1da177e4 LT |
777 | goto done; |
778 | } | |
7562f876 PE |
779 | cont: |
780 | idx++; | |
1da177e4 LT |
781 | } |
782 | done: | |
e67f88dd | 783 | rcu_read_unlock(); |
1da177e4 LT |
784 | cb->args[0] = idx; |
785 | cb->args[1] = dn_idx; | |
786 | ||
787 | return skb->len; | |
788 | } | |
789 | ||
c4ea94ab | 790 | static int dn_dev_get_first(struct net_device *dev, __le16 *addr) |
1da177e4 | 791 | { |
fc766e4c | 792 | struct dn_dev *dn_db; |
1da177e4 LT |
793 | struct dn_ifaddr *ifa; |
794 | int rv = -ENODEV; | |
41bdecf1 | 795 | |
fc766e4c ED |
796 | rcu_read_lock(); |
797 | dn_db = rcu_dereference(dev->dn_ptr); | |
1da177e4 LT |
798 | if (dn_db == NULL) |
799 | goto out; | |
41bdecf1 | 800 | |
fc766e4c | 801 | ifa = rcu_dereference(dn_db->ifa_list); |
1da177e4 LT |
802 | if (ifa != NULL) { |
803 | *addr = ifa->ifa_local; | |
804 | rv = 0; | |
805 | } | |
806 | out: | |
fc766e4c | 807 | rcu_read_unlock(); |
1da177e4 LT |
808 | return rv; |
809 | } | |
810 | ||
429eb0fa | 811 | /* |
1da177e4 LT |
812 | * Find a default address to bind to. |
813 | * | |
814 | * This is one of those areas where the initial VMS concepts don't really | |
815 | * map onto the Linux concepts, and since we introduced multiple addresses | |
816 | * per interface we have to cope with slightly odd ways of finding out what | |
817 | * "our address" really is. Mostly it's not a problem; for this we just guess | |
818 | * a sensible default. Eventually the routing code will take care of all the | |
819 | * nasties for us I hope. | |
820 | */ | |
c4ea94ab | 821 | int dn_dev_bind_default(__le16 *addr) |
1da177e4 LT |
822 | { |
823 | struct net_device *dev; | |
824 | int rv; | |
825 | dev = dn_dev_get_default(); | |
826 | last_chance: | |
827 | if (dev) { | |
1da177e4 | 828 | rv = dn_dev_get_first(dev, addr); |
1da177e4 | 829 | dev_put(dev); |
2774c7ab | 830 | if (rv == 0 || dev == init_net.loopback_dev) |
1da177e4 LT |
831 | return rv; |
832 | } | |
2774c7ab | 833 | dev = init_net.loopback_dev; |
1da177e4 LT |
834 | dev_hold(dev); |
835 | goto last_chance; | |
836 | } | |
837 | ||
838 | static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa) | |
839 | { | |
429eb0fa YH |
840 | struct endnode_hello_message *msg; |
841 | struct sk_buff *skb = NULL; | |
842 | __le16 *pktlen; | |
fc766e4c | 843 | struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr); |
1da177e4 | 844 | |
429eb0fa | 845 | if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL) |
1da177e4 LT |
846 | return; |
847 | ||
429eb0fa | 848 | skb->dev = dev; |
1da177e4 | 849 | |
4df864c1 | 850 | msg = skb_put(skb, sizeof(*msg)); |
1da177e4 | 851 | |
429eb0fa YH |
852 | msg->msgflg = 0x0D; |
853 | memcpy(msg->tiver, dn_eco_version, 3); | |
1da177e4 | 854 | dn_dn2eth(msg->id, ifa->ifa_local); |
429eb0fa | 855 | msg->iinfo = DN_RT_INFO_ENDN; |
c4106aa8 | 856 | msg->blksize = cpu_to_le16(mtu2blksize(dev)); |
429eb0fa YH |
857 | msg->area = 0x00; |
858 | memset(msg->seed, 0, 8); | |
859 | memcpy(msg->neighbor, dn_hiord, ETH_ALEN); | |
1da177e4 LT |
860 | |
861 | if (dn_db->router) { | |
862 | struct dn_neigh *dn = (struct dn_neigh *)dn_db->router; | |
863 | dn_dn2eth(msg->neighbor, dn->addr); | |
864 | } | |
865 | ||
c4106aa8 | 866 | msg->timer = cpu_to_le16((unsigned short)dn_db->parms.t3); |
429eb0fa YH |
867 | msg->mpd = 0x00; |
868 | msg->datalen = 0x02; | |
869 | memset(msg->data, 0xAA, 2); | |
870 | ||
d58ff351 | 871 | pktlen = skb_push(skb, 2); |
c4106aa8 | 872 | *pktlen = cpu_to_le16(skb->len - 2); |
1da177e4 | 873 | |
c1d2bbe1 | 874 | skb_reset_network_header(skb); |
1da177e4 LT |
875 | |
876 | dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id); | |
877 | } | |
878 | ||
879 | ||
880 | #define DRDELAY (5 * HZ) | |
881 | ||
882 | static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa) | |
883 | { | |
884 | /* First check time since device went up */ | |
b5c5c36d | 885 | if (time_before(jiffies, dn_db->uptime + DRDELAY)) |
1da177e4 LT |
886 | return 0; |
887 | ||
888 | /* If there is no router, then yes... */ | |
889 | if (!dn_db->router) | |
890 | return 1; | |
891 | ||
892 | /* otherwise only if we have a higher priority or.. */ | |
893 | if (dn->priority < dn_db->parms.priority) | |
894 | return 1; | |
895 | ||
896 | /* if we have equal priority and a higher node number */ | |
897 | if (dn->priority != dn_db->parms.priority) | |
898 | return 0; | |
899 | ||
c4106aa8 | 900 | if (le16_to_cpu(dn->addr) < le16_to_cpu(ifa->ifa_local)) |
1da177e4 LT |
901 | return 1; |
902 | ||
903 | return 0; | |
904 | } | |
905 | ||
906 | static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa) | |
907 | { | |
908 | int n; | |
fc766e4c | 909 | struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr); |
1da177e4 LT |
910 | struct dn_neigh *dn = (struct dn_neigh *)dn_db->router; |
911 | struct sk_buff *skb; | |
912 | size_t size; | |
913 | unsigned char *ptr; | |
914 | unsigned char *i1, *i2; | |
c4ea94ab | 915 | __le16 *pktlen; |
1da177e4 LT |
916 | char *src; |
917 | ||
918 | if (mtu2blksize(dev) < (26 + 7)) | |
919 | return; | |
920 | ||
921 | n = mtu2blksize(dev) - 26; | |
922 | n /= 7; | |
923 | ||
924 | if (n > 32) | |
925 | n = 32; | |
926 | ||
927 | size = 2 + 26 + 7 * n; | |
928 | ||
929 | if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL) | |
930 | return; | |
931 | ||
932 | skb->dev = dev; | |
933 | ptr = skb_put(skb, size); | |
934 | ||
935 | *ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH; | |
936 | *ptr++ = 2; /* ECO */ | |
937 | *ptr++ = 0; | |
938 | *ptr++ = 0; | |
939 | dn_dn2eth(ptr, ifa->ifa_local); | |
940 | src = ptr; | |
941 | ptr += ETH_ALEN; | |
429eb0fa | 942 | *ptr++ = dn_db->parms.forwarding == 1 ? |
1da177e4 | 943 | DN_RT_INFO_L1RT : DN_RT_INFO_L2RT; |
c4106aa8 | 944 | *((__le16 *)ptr) = cpu_to_le16(mtu2blksize(dev)); |
1da177e4 | 945 | ptr += 2; |
429eb0fa | 946 | *ptr++ = dn_db->parms.priority; /* Priority */ |
1da177e4 | 947 | *ptr++ = 0; /* Area: Reserved */ |
c4106aa8 | 948 | *((__le16 *)ptr) = cpu_to_le16((unsigned short)dn_db->parms.t3); |
1da177e4 LT |
949 | ptr += 2; |
950 | *ptr++ = 0; /* MPD: Reserved */ | |
951 | i1 = ptr++; | |
952 | memset(ptr, 0, 7); /* Name: Reserved */ | |
953 | ptr += 7; | |
954 | i2 = ptr++; | |
955 | ||
956 | n = dn_neigh_elist(dev, ptr, n); | |
957 | ||
958 | *i2 = 7 * n; | |
959 | *i1 = 8 + *i2; | |
960 | ||
961 | skb_trim(skb, (27 + *i2)); | |
962 | ||
d58ff351 | 963 | pktlen = skb_push(skb, 2); |
c4106aa8 | 964 | *pktlen = cpu_to_le16(skb->len - 2); |
1da177e4 | 965 | |
c1d2bbe1 | 966 | skb_reset_network_header(skb); |
1da177e4 LT |
967 | |
968 | if (dn_am_i_a_router(dn, dn_db, ifa)) { | |
969 | struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC); | |
970 | if (skb2) { | |
971 | dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src); | |
972 | } | |
973 | } | |
974 | ||
975 | dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src); | |
976 | } | |
977 | ||
978 | static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa) | |
979 | { | |
fc766e4c | 980 | struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr); |
1da177e4 LT |
981 | |
982 | if (dn_db->parms.forwarding == 0) | |
983 | dn_send_endnode_hello(dev, ifa); | |
984 | else | |
985 | dn_send_router_hello(dev, ifa); | |
986 | } | |
987 | ||
988 | static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa) | |
989 | { | |
990 | int tdlen = 16; | |
991 | int size = dev->hard_header_len + 2 + 4 + tdlen; | |
992 | struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC); | |
993 | int i; | |
994 | unsigned char *ptr; | |
995 | char src[ETH_ALEN]; | |
996 | ||
997 | if (skb == NULL) | |
998 | return ; | |
999 | ||
1000 | skb->dev = dev; | |
1001 | skb_push(skb, dev->hard_header_len); | |
1002 | ptr = skb_put(skb, 2 + 4 + tdlen); | |
1003 | ||
1004 | *ptr++ = DN_RT_PKT_HELO; | |
c4ea94ab | 1005 | *((__le16 *)ptr) = ifa->ifa_local; |
1da177e4 LT |
1006 | ptr += 2; |
1007 | *ptr++ = tdlen; | |
1008 | ||
1009 | for(i = 0; i < tdlen; i++) | |
1010 | *ptr++ = 0252; | |
1011 | ||
1012 | dn_dn2eth(src, ifa->ifa_local); | |
1013 | dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src); | |
1014 | } | |
1015 | ||
1016 | static int dn_eth_up(struct net_device *dev) | |
1017 | { | |
fc766e4c | 1018 | struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr); |
1da177e4 LT |
1019 | |
1020 | if (dn_db->parms.forwarding == 0) | |
22bedad3 | 1021 | dev_mc_add(dev, dn_rt_all_end_mcast); |
1da177e4 | 1022 | else |
22bedad3 | 1023 | dev_mc_add(dev, dn_rt_all_rt_mcast); |
1da177e4 | 1024 | |
1da177e4 LT |
1025 | dn_db->use_long = 1; |
1026 | ||
1027 | return 0; | |
1028 | } | |
1029 | ||
1030 | static void dn_eth_down(struct net_device *dev) | |
1031 | { | |
fc766e4c | 1032 | struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr); |
1da177e4 LT |
1033 | |
1034 | if (dn_db->parms.forwarding == 0) | |
22bedad3 | 1035 | dev_mc_del(dev, dn_rt_all_end_mcast); |
1da177e4 | 1036 | else |
22bedad3 | 1037 | dev_mc_del(dev, dn_rt_all_rt_mcast); |
1da177e4 LT |
1038 | } |
1039 | ||
1040 | static void dn_dev_set_timer(struct net_device *dev); | |
1041 | ||
eb4ddaf4 | 1042 | static void dn_dev_timer_func(struct timer_list *t) |
1da177e4 | 1043 | { |
eb4ddaf4 KC |
1044 | struct dn_dev *dn_db = from_timer(dn_db, t, timer); |
1045 | struct net_device *dev; | |
1da177e4 LT |
1046 | struct dn_ifaddr *ifa; |
1047 | ||
fc766e4c | 1048 | rcu_read_lock(); |
eb4ddaf4 | 1049 | dev = dn_db->dev; |
1da177e4 LT |
1050 | if (dn_db->t3 <= dn_db->parms.t2) { |
1051 | if (dn_db->parms.timer3) { | |
fc766e4c ED |
1052 | for (ifa = rcu_dereference(dn_db->ifa_list); |
1053 | ifa; | |
1054 | ifa = rcu_dereference(ifa->ifa_next)) { | |
1da177e4 LT |
1055 | if (!(ifa->ifa_flags & IFA_F_SECONDARY)) |
1056 | dn_db->parms.timer3(dev, ifa); | |
1057 | } | |
1058 | } | |
1059 | dn_db->t3 = dn_db->parms.t3; | |
1060 | } else { | |
1061 | dn_db->t3 -= dn_db->parms.t2; | |
1062 | } | |
fc766e4c | 1063 | rcu_read_unlock(); |
1da177e4 LT |
1064 | dn_dev_set_timer(dev); |
1065 | } | |
1066 | ||
1067 | static void dn_dev_set_timer(struct net_device *dev) | |
1068 | { | |
fc766e4c | 1069 | struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr); |
1da177e4 LT |
1070 | |
1071 | if (dn_db->parms.t2 > dn_db->parms.t3) | |
1072 | dn_db->parms.t2 = dn_db->parms.t3; | |
1073 | ||
1da177e4 LT |
1074 | dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ); |
1075 | ||
1076 | add_timer(&dn_db->timer); | |
1077 | } | |
1078 | ||
5eaa65b2 | 1079 | static struct dn_dev *dn_dev_create(struct net_device *dev, int *err) |
1da177e4 LT |
1080 | { |
1081 | int i; | |
1082 | struct dn_dev_parms *p = dn_dev_list; | |
1083 | struct dn_dev *dn_db; | |
1084 | ||
1085 | for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) { | |
1086 | if (p->type == dev->type) | |
1087 | break; | |
1088 | } | |
1089 | ||
1090 | *err = -ENODEV; | |
1091 | if (i == DN_DEV_LIST_SIZE) | |
1092 | return NULL; | |
1093 | ||
1094 | *err = -ENOBUFS; | |
0da974f4 | 1095 | if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL) |
1da177e4 LT |
1096 | return NULL; |
1097 | ||
1da177e4 | 1098 | memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms)); |
fc766e4c | 1099 | |
cf778b00 | 1100 | rcu_assign_pointer(dev->dn_ptr, dn_db); |
1da177e4 | 1101 | dn_db->dev = dev; |
eb4ddaf4 | 1102 | timer_setup(&dn_db->timer, dn_dev_timer_func, 0); |
1da177e4 LT |
1103 | |
1104 | dn_db->uptime = jiffies; | |
95743deb EB |
1105 | |
1106 | dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table); | |
1107 | if (!dn_db->neigh_parms) { | |
a9b3cd7f | 1108 | RCU_INIT_POINTER(dev->dn_ptr, NULL); |
95743deb EB |
1109 | kfree(dn_db); |
1110 | return NULL; | |
1111 | } | |
1112 | ||
1da177e4 LT |
1113 | if (dn_db->parms.up) { |
1114 | if (dn_db->parms.up(dev) < 0) { | |
95743deb | 1115 | neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms); |
1da177e4 LT |
1116 | dev->dn_ptr = NULL; |
1117 | kfree(dn_db); | |
1118 | return NULL; | |
1119 | } | |
1120 | } | |
1121 | ||
1da177e4 LT |
1122 | dn_dev_sysctl_register(dev, &dn_db->parms); |
1123 | ||
1124 | dn_dev_set_timer(dev); | |
1125 | ||
1126 | *err = 0; | |
1127 | return dn_db; | |
1128 | } | |
1129 | ||
1130 | ||
1131 | /* | |
1132 | * This processes a device up event. We only start up | |
1133 | * the loopback device & ethernet devices with correct | |
b595076a | 1134 | * MAC addresses automatically. Others must be started |
1da177e4 LT |
1135 | * specifically. |
1136 | * | |
1137 | * FIXME: How should we configure the loopback address ? If we could dispense | |
1138 | * with using decnet_address here and for autobind, it will be one less thing | |
1139 | * for users to worry about setting up. | |
1140 | */ | |
1141 | ||
1142 | void dn_dev_up(struct net_device *dev) | |
1143 | { | |
1144 | struct dn_ifaddr *ifa; | |
c4ea94ab | 1145 | __le16 addr = decnet_address; |
1da177e4 | 1146 | int maybe_default = 0; |
fc766e4c | 1147 | struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr); |
1da177e4 LT |
1148 | |
1149 | if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK)) | |
1150 | return; | |
1151 | ||
1152 | /* | |
1153 | * Need to ensure that loopback device has a dn_db attached to it | |
1154 | * to allow creation of neighbours against it, even though it might | |
1155 | * not have a local address of its own. Might as well do the same for | |
1156 | * all autoconfigured interfaces. | |
1157 | */ | |
1158 | if (dn_db == NULL) { | |
1159 | int err; | |
1160 | dn_db = dn_dev_create(dev, &err); | |
1161 | if (dn_db == NULL) | |
1162 | return; | |
1163 | } | |
1164 | ||
1165 | if (dev->type == ARPHRD_ETHER) { | |
1166 | if (memcmp(dev->dev_addr, dn_hiord, 4) != 0) | |
1167 | return; | |
c4ea94ab | 1168 | addr = dn_eth2dn(dev->dev_addr); |
1da177e4 LT |
1169 | maybe_default = 1; |
1170 | } | |
1171 | ||
1172 | if (addr == 0) | |
1173 | return; | |
1174 | ||
1175 | if ((ifa = dn_dev_alloc_ifa()) == NULL) | |
1176 | return; | |
1177 | ||
1178 | ifa->ifa_local = ifa->ifa_address = addr; | |
1179 | ifa->ifa_flags = 0; | |
1180 | ifa->ifa_scope = RT_SCOPE_UNIVERSE; | |
1181 | strcpy(ifa->ifa_label, dev->name); | |
1182 | ||
1183 | dn_dev_set_ifa(dev, ifa); | |
1184 | ||
1185 | /* | |
1186 | * Automagically set the default device to the first automatically | |
1187 | * configured ethernet card in the system. | |
1188 | */ | |
1189 | if (maybe_default) { | |
1190 | dev_hold(dev); | |
1191 | if (dn_dev_set_default(dev, 0)) | |
1192 | dev_put(dev); | |
1193 | } | |
1194 | } | |
1195 | ||
1196 | static void dn_dev_delete(struct net_device *dev) | |
1197 | { | |
fc766e4c | 1198 | struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr); |
1da177e4 LT |
1199 | |
1200 | if (dn_db == NULL) | |
1201 | return; | |
1202 | ||
1203 | del_timer_sync(&dn_db->timer); | |
1204 | dn_dev_sysctl_unregister(&dn_db->parms); | |
1205 | dn_dev_check_default(dev); | |
1206 | neigh_ifdown(&dn_neigh_table, dev); | |
1207 | ||
1208 | if (dn_db->parms.down) | |
1209 | dn_db->parms.down(dev); | |
1210 | ||
1211 | dev->dn_ptr = NULL; | |
1212 | ||
1213 | neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms); | |
1214 | neigh_ifdown(&dn_neigh_table, dev); | |
1215 | ||
1216 | if (dn_db->router) | |
1217 | neigh_release(dn_db->router); | |
1218 | if (dn_db->peer) | |
1219 | neigh_release(dn_db->peer); | |
1220 | ||
1221 | kfree(dn_db); | |
1222 | } | |
1223 | ||
1224 | void dn_dev_down(struct net_device *dev) | |
1225 | { | |
fc766e4c | 1226 | struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr); |
1da177e4 LT |
1227 | struct dn_ifaddr *ifa; |
1228 | ||
1229 | if (dn_db == NULL) | |
1230 | return; | |
1231 | ||
fc766e4c | 1232 | while ((ifa = rtnl_dereference(dn_db->ifa_list)) != NULL) { |
1da177e4 LT |
1233 | dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0); |
1234 | dn_dev_free_ifa(ifa); | |
1235 | } | |
1236 | ||
1237 | dn_dev_delete(dev); | |
1238 | } | |
1239 | ||
1240 | void dn_dev_init_pkt(struct sk_buff *skb) | |
1241 | { | |
1da177e4 LT |
1242 | } |
1243 | ||
1244 | void dn_dev_veri_pkt(struct sk_buff *skb) | |
1245 | { | |
1da177e4 LT |
1246 | } |
1247 | ||
1248 | void dn_dev_hello(struct sk_buff *skb) | |
1249 | { | |
1da177e4 LT |
1250 | } |
1251 | ||
1252 | void dn_dev_devices_off(void) | |
1253 | { | |
1254 | struct net_device *dev; | |
1255 | ||
1256 | rtnl_lock(); | |
881d966b | 1257 | for_each_netdev(&init_net, dev) |
1da177e4 LT |
1258 | dn_dev_down(dev); |
1259 | rtnl_unlock(); | |
1260 | ||
1261 | } | |
1262 | ||
1263 | void dn_dev_devices_on(void) | |
1264 | { | |
1265 | struct net_device *dev; | |
1266 | ||
1267 | rtnl_lock(); | |
881d966b | 1268 | for_each_netdev(&init_net, dev) { |
1da177e4 LT |
1269 | if (dev->flags & IFF_UP) |
1270 | dn_dev_up(dev); | |
1271 | } | |
1272 | rtnl_unlock(); | |
1273 | } | |
1274 | ||
1275 | int register_dnaddr_notifier(struct notifier_block *nb) | |
1276 | { | |
e041c683 | 1277 | return blocking_notifier_chain_register(&dnaddr_chain, nb); |
1da177e4 LT |
1278 | } |
1279 | ||
1280 | int unregister_dnaddr_notifier(struct notifier_block *nb) | |
1281 | { | |
e041c683 | 1282 | return blocking_notifier_chain_unregister(&dnaddr_chain, nb); |
1da177e4 LT |
1283 | } |
1284 | ||
1285 | #ifdef CONFIG_PROC_FS | |
7562f876 | 1286 | static inline int is_dn_dev(struct net_device *dev) |
1da177e4 | 1287 | { |
7562f876 | 1288 | return dev->dn_ptr != NULL; |
1da177e4 LT |
1289 | } |
1290 | ||
7562f876 | 1291 | static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos) |
fc766e4c | 1292 | __acquires(RCU) |
1da177e4 | 1293 | { |
7562f876 | 1294 | int i; |
1da177e4 LT |
1295 | struct net_device *dev; |
1296 | ||
fa918602 | 1297 | rcu_read_lock(); |
1da177e4 | 1298 | |
7562f876 PE |
1299 | if (*pos == 0) |
1300 | return SEQ_START_TOKEN; | |
1301 | ||
1302 | i = 1; | |
fa918602 | 1303 | for_each_netdev_rcu(&init_net, dev) { |
7562f876 PE |
1304 | if (!is_dn_dev(dev)) |
1305 | continue; | |
1306 | ||
1307 | if (i++ == *pos) | |
1308 | return dev; | |
1da177e4 | 1309 | } |
7562f876 PE |
1310 | |
1311 | return NULL; | |
1da177e4 LT |
1312 | } |
1313 | ||
1314 | static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1315 | { | |
7562f876 | 1316 | struct net_device *dev; |
1da177e4 | 1317 | |
1da177e4 | 1318 | ++*pos; |
7562f876 | 1319 | |
ea110733 | 1320 | dev = v; |
7562f876 | 1321 | if (v == SEQ_START_TOKEN) |
881d966b | 1322 | dev = net_device_entry(&init_net.dev_base_head); |
7562f876 | 1323 | |
fa918602 | 1324 | for_each_netdev_continue_rcu(&init_net, dev) { |
7562f876 PE |
1325 | if (!is_dn_dev(dev)) |
1326 | continue; | |
1327 | ||
1328 | return dev; | |
1329 | } | |
1330 | ||
1331 | return NULL; | |
1da177e4 LT |
1332 | } |
1333 | ||
1334 | static void dn_dev_seq_stop(struct seq_file *seq, void *v) | |
fc766e4c | 1335 | __releases(RCU) |
1da177e4 | 1336 | { |
fa918602 | 1337 | rcu_read_unlock(); |
1da177e4 LT |
1338 | } |
1339 | ||
1340 | static char *dn_type2asc(char type) | |
1341 | { | |
06f8fe11 JP |
1342 | switch (type) { |
1343 | case DN_DEV_BCAST: | |
1344 | return "B"; | |
1345 | case DN_DEV_UCAST: | |
1346 | return "U"; | |
1347 | case DN_DEV_MPOINT: | |
1348 | return "M"; | |
1da177e4 LT |
1349 | } |
1350 | ||
1351 | return "?"; | |
1352 | } | |
1353 | ||
1354 | static int dn_dev_seq_show(struct seq_file *seq, void *v) | |
1355 | { | |
1356 | if (v == SEQ_START_TOKEN) | |
429eb0fa | 1357 | seq_puts(seq, "Name Flags T1 Timer1 T3 Timer3 BlkSize Pri State DevType Router Peer\n"); |
1da177e4 LT |
1358 | else { |
1359 | struct net_device *dev = v; | |
1360 | char peer_buf[DN_ASCBUF_LEN]; | |
1361 | char router_buf[DN_ASCBUF_LEN]; | |
fc766e4c | 1362 | struct dn_dev *dn_db = rcu_dereference(dev->dn_ptr); |
1da177e4 | 1363 | |
429eb0fa | 1364 | seq_printf(seq, "%-8s %1s %04u %04u %04lu %04lu" |
1da177e4 | 1365 | " %04hu %03d %02x %-10s %-7s %-7s\n", |
5b9b0a80 | 1366 | dev->name, |
429eb0fa YH |
1367 | dn_type2asc(dn_db->parms.mode), |
1368 | 0, 0, | |
1da177e4 LT |
1369 | dn_db->t3, dn_db->parms.t3, |
1370 | mtu2blksize(dev), | |
1371 | dn_db->parms.priority, | |
1372 | dn_db->parms.state, dn_db->parms.name, | |
c4106aa8 HH |
1373 | dn_db->router ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->router->primary_key), router_buf) : "", |
1374 | dn_db->peer ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->peer->primary_key), peer_buf) : ""); | |
1da177e4 LT |
1375 | } |
1376 | return 0; | |
1377 | } | |
1378 | ||
56b3d975 | 1379 | static const struct seq_operations dn_dev_seq_ops = { |
1da177e4 LT |
1380 | .start = dn_dev_seq_start, |
1381 | .next = dn_dev_seq_next, | |
1382 | .stop = dn_dev_seq_stop, | |
1383 | .show = dn_dev_seq_show, | |
1384 | }; | |
1da177e4 LT |
1385 | #endif /* CONFIG_PROC_FS */ |
1386 | ||
4e058063 | 1387 | static int addr[2]; |
1da177e4 LT |
1388 | module_param_array(addr, int, NULL, 0444); |
1389 | MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node"); | |
1390 | ||
1391 | void __init dn_dev_init(void) | |
1392 | { | |
429eb0fa YH |
1393 | if (addr[0] > 63 || addr[0] < 0) { |
1394 | printk(KERN_ERR "DECnet: Area must be between 0 and 63"); | |
1395 | return; | |
1396 | } | |
1da177e4 | 1397 | |
429eb0fa YH |
1398 | if (addr[1] > 1023 || addr[1] < 0) { |
1399 | printk(KERN_ERR "DECnet: Node must be between 0 and 1023"); | |
1400 | return; | |
1401 | } | |
1da177e4 | 1402 | |
c4106aa8 | 1403 | decnet_address = cpu_to_le16((addr[0] << 10) | addr[1]); |
1da177e4 LT |
1404 | |
1405 | dn_dev_devices_on(); | |
1406 | ||
c1c502b5 FW |
1407 | rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_NEWADDR, |
1408 | dn_nl_newaddr, NULL, 0); | |
1409 | rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_DELADDR, | |
1410 | dn_nl_deladdr, NULL, 0); | |
1411 | rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_GETADDR, | |
1412 | NULL, dn_nl_dump_ifaddr, 0); | |
1da177e4 | 1413 | |
fddda2b7 | 1414 | proc_create_seq("decnet_dev", 0444, init_net.proc_net, &dn_dev_seq_ops); |
1da177e4 LT |
1415 | |
1416 | #ifdef CONFIG_SYSCTL | |
1417 | { | |
1418 | int i; | |
1419 | for(i = 0; i < DN_DEV_LIST_SIZE; i++) | |
1420 | dn_dev_sysctl_register(NULL, &dn_dev_list[i]); | |
1421 | } | |
1422 | #endif /* CONFIG_SYSCTL */ | |
1423 | } | |
1424 | ||
1425 | void __exit dn_dev_cleanup(void) | |
1426 | { | |
1da177e4 LT |
1427 | #ifdef CONFIG_SYSCTL |
1428 | { | |
1429 | int i; | |
1430 | for(i = 0; i < DN_DEV_LIST_SIZE; i++) | |
1431 | dn_dev_sysctl_unregister(&dn_dev_list[i]); | |
1432 | } | |
1433 | #endif /* CONFIG_SYSCTL */ | |
1434 | ||
ece31ffd | 1435 | remove_proc_entry("decnet_dev", init_net.proc_net); |
1da177e4 LT |
1436 | |
1437 | dn_dev_devices_off(); | |
1438 | } |