Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
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 Routing Forwarding Information Base (Glue/Info List) | |
7 | * | |
8 | * Author: Steve Whitehouse <SteveW@ACM.org> | |
9 | * | |
10 | * | |
11 | * Changes: | |
12 | * Alexey Kuznetsov : SMP locking changes | |
13 | * Steve Whitehouse : Rewrote it... Well to be more correct, I | |
14 | * copied most of it from the ipv4 fib code. | |
15 | * Steve Whitehouse : Updated it in style and fixed a few bugs | |
16 | * which were fixed in the ipv4 code since | |
17 | * this code was copied from it. | |
18 | * | |
19 | */ | |
1da177e4 LT |
20 | #include <linux/string.h> |
21 | #include <linux/net.h> | |
22 | #include <linux/socket.h> | |
5a0e3ad6 | 23 | #include <linux/slab.h> |
1da177e4 LT |
24 | #include <linux/sockios.h> |
25 | #include <linux/init.h> | |
26 | #include <linux/skbuff.h> | |
27 | #include <linux/netlink.h> | |
28 | #include <linux/rtnetlink.h> | |
29 | #include <linux/proc_fs.h> | |
30 | #include <linux/netdevice.h> | |
31 | #include <linux/timer.h> | |
32 | #include <linux/spinlock.h> | |
60063497 | 33 | #include <linux/atomic.h> |
1da177e4 LT |
34 | #include <asm/uaccess.h> |
35 | #include <net/neighbour.h> | |
36 | #include <net/dst.h> | |
37 | #include <net/flow.h> | |
a8731cbf | 38 | #include <net/fib_rules.h> |
1da177e4 LT |
39 | #include <net/dn.h> |
40 | #include <net/dn_route.h> | |
41 | #include <net/dn_fib.h> | |
42 | #include <net/dn_neigh.h> | |
43 | #include <net/dn_dev.h> | |
44 | ||
45 | #define RT_MIN_TABLE 1 | |
46 | ||
47 | #define for_fib_info() { struct dn_fib_info *fi;\ | |
48 | for(fi = dn_fib_info_list; fi; fi = fi->fib_next) | |
49 | #define endfor_fib_info() } | |
50 | ||
51 | #define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\ | |
52 | for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++) | |
53 | ||
54 | #define change_nexthops(fi) { int nhsel; struct dn_fib_nh *nh;\ | |
55 | for(nhsel = 0, nh = (struct dn_fib_nh *)((fi)->fib_nh); nhsel < (fi)->fib_nhs; nh++, nhsel++) | |
56 | ||
57 | #define endfor_nexthops(fi) } | |
58 | ||
1da177e4 LT |
59 | static DEFINE_SPINLOCK(dn_fib_multipath_lock); |
60 | static struct dn_fib_info *dn_fib_info_list; | |
a22ec367 | 61 | static DEFINE_SPINLOCK(dn_fib_info_lock); |
1da177e4 LT |
62 | |
63 | static struct | |
64 | { | |
65 | int error; | |
66 | u8 scope; | |
a9791011 | 67 | } dn_fib_props[RTN_MAX+1] = { |
1da177e4 LT |
68 | [RTN_UNSPEC] = { .error = 0, .scope = RT_SCOPE_NOWHERE }, |
69 | [RTN_UNICAST] = { .error = 0, .scope = RT_SCOPE_UNIVERSE }, | |
70 | [RTN_LOCAL] = { .error = 0, .scope = RT_SCOPE_HOST }, | |
71 | [RTN_BROADCAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE }, | |
72 | [RTN_ANYCAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE }, | |
73 | [RTN_MULTICAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE }, | |
74 | [RTN_BLACKHOLE] = { .error = -EINVAL, .scope = RT_SCOPE_UNIVERSE }, | |
75 | [RTN_UNREACHABLE] = { .error = -EHOSTUNREACH, .scope = RT_SCOPE_UNIVERSE }, | |
76 | [RTN_PROHIBIT] = { .error = -EACCES, .scope = RT_SCOPE_UNIVERSE }, | |
77 | [RTN_THROW] = { .error = -EAGAIN, .scope = RT_SCOPE_UNIVERSE }, | |
78 | [RTN_NAT] = { .error = 0, .scope = RT_SCOPE_NOWHERE }, | |
79 | [RTN_XRESOLVE] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE }, | |
80 | }; | |
81 | ||
2aa7f36c AB |
82 | static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force); |
83 | static int dn_fib_sync_up(struct net_device *dev); | |
84 | ||
1da177e4 LT |
85 | void dn_fib_free_info(struct dn_fib_info *fi) |
86 | { | |
87 | if (fi->fib_dead == 0) { | |
88 | printk(KERN_DEBUG "DECnet: BUG! Attempt to free alive dn_fib_info\n"); | |
89 | return; | |
90 | } | |
91 | ||
92 | change_nexthops(fi) { | |
93 | if (nh->nh_dev) | |
94 | dev_put(nh->nh_dev); | |
95 | nh->nh_dev = NULL; | |
96 | } endfor_nexthops(fi); | |
97 | kfree(fi); | |
98 | } | |
99 | ||
100 | void dn_fib_release_info(struct dn_fib_info *fi) | |
101 | { | |
a22ec367 | 102 | spin_lock(&dn_fib_info_lock); |
1da177e4 LT |
103 | if (fi && --fi->fib_treeref == 0) { |
104 | if (fi->fib_next) | |
105 | fi->fib_next->fib_prev = fi->fib_prev; | |
106 | if (fi->fib_prev) | |
107 | fi->fib_prev->fib_next = fi->fib_next; | |
108 | if (fi == dn_fib_info_list) | |
109 | dn_fib_info_list = fi->fib_next; | |
110 | fi->fib_dead = 1; | |
111 | dn_fib_info_put(fi); | |
112 | } | |
a22ec367 | 113 | spin_unlock(&dn_fib_info_lock); |
1da177e4 LT |
114 | } |
115 | ||
116 | static inline int dn_fib_nh_comp(const struct dn_fib_info *fi, const struct dn_fib_info *ofi) | |
117 | { | |
118 | const struct dn_fib_nh *onh = ofi->fib_nh; | |
119 | ||
120 | for_nexthops(fi) { | |
121 | if (nh->nh_oif != onh->nh_oif || | |
122 | nh->nh_gw != onh->nh_gw || | |
123 | nh->nh_scope != onh->nh_scope || | |
124 | nh->nh_weight != onh->nh_weight || | |
125 | ((nh->nh_flags^onh->nh_flags)&~RTNH_F_DEAD)) | |
126 | return -1; | |
127 | onh++; | |
128 | } endfor_nexthops(fi); | |
129 | return 0; | |
130 | } | |
131 | ||
132 | static inline struct dn_fib_info *dn_fib_find_info(const struct dn_fib_info *nfi) | |
133 | { | |
134 | for_fib_info() { | |
135 | if (fi->fib_nhs != nfi->fib_nhs) | |
136 | continue; | |
137 | if (nfi->fib_protocol == fi->fib_protocol && | |
138 | nfi->fib_prefsrc == fi->fib_prefsrc && | |
139 | nfi->fib_priority == fi->fib_priority && | |
140 | memcmp(nfi->fib_metrics, fi->fib_metrics, sizeof(fi->fib_metrics)) == 0 && | |
141 | ((nfi->fib_flags^fi->fib_flags)&~RTNH_F_DEAD) == 0 && | |
142 | (nfi->fib_nhs == 0 || dn_fib_nh_comp(fi, nfi) == 0)) | |
143 | return fi; | |
144 | } endfor_fib_info(); | |
145 | return NULL; | |
146 | } | |
147 | ||
58d7d8f9 | 148 | static int dn_fib_count_nhs(const struct nlattr *attr) |
1da177e4 | 149 | { |
58d7d8f9 TG |
150 | struct rtnexthop *nhp = nla_data(attr); |
151 | int nhs = 0, nhlen = nla_len(attr); | |
1da177e4 LT |
152 | |
153 | while(nhlen >= (int)sizeof(struct rtnexthop)) { | |
154 | if ((nhlen -= nhp->rtnh_len) < 0) | |
155 | return 0; | |
156 | nhs++; | |
157 | nhp = RTNH_NEXT(nhp); | |
158 | } | |
159 | ||
160 | return nhs; | |
161 | } | |
162 | ||
58d7d8f9 TG |
163 | static int dn_fib_get_nhs(struct dn_fib_info *fi, const struct nlattr *attr, |
164 | const struct rtmsg *r) | |
1da177e4 | 165 | { |
58d7d8f9 TG |
166 | struct rtnexthop *nhp = nla_data(attr); |
167 | int nhlen = nla_len(attr); | |
1da177e4 LT |
168 | |
169 | change_nexthops(fi) { | |
170 | int attrlen = nhlen - sizeof(struct rtnexthop); | |
171 | if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0) | |
172 | return -EINVAL; | |
173 | ||
174 | nh->nh_flags = (r->rtm_flags&~0xFF) | nhp->rtnh_flags; | |
175 | nh->nh_oif = nhp->rtnh_ifindex; | |
176 | nh->nh_weight = nhp->rtnh_hops + 1; | |
177 | ||
178 | if (attrlen) { | |
58d7d8f9 TG |
179 | struct nlattr *gw_attr; |
180 | ||
181 | gw_attr = nla_find((struct nlattr *) (nhp + 1), attrlen, RTA_GATEWAY); | |
182 | nh->nh_gw = gw_attr ? nla_get_le16(gw_attr) : 0; | |
1da177e4 LT |
183 | } |
184 | nhp = RTNH_NEXT(nhp); | |
185 | } endfor_nexthops(fi); | |
186 | ||
187 | return 0; | |
188 | } | |
189 | ||
190 | ||
191 | static int dn_fib_check_nh(const struct rtmsg *r, struct dn_fib_info *fi, struct dn_fib_nh *nh) | |
192 | { | |
193 | int err; | |
194 | ||
195 | if (nh->nh_gw) { | |
bef55aeb | 196 | struct flowidn fld; |
1da177e4 LT |
197 | struct dn_fib_res res; |
198 | ||
1da177e4 LT |
199 | if (nh->nh_flags&RTNH_F_ONLINK) { |
200 | struct net_device *dev; | |
201 | ||
202 | if (r->rtm_scope >= RT_SCOPE_LINK) | |
203 | return -EINVAL; | |
204 | if (dnet_addr_type(nh->nh_gw) != RTN_UNICAST) | |
205 | return -EINVAL; | |
881d966b | 206 | if ((dev = __dev_get_by_index(&init_net, nh->nh_oif)) == NULL) |
1da177e4 LT |
207 | return -ENODEV; |
208 | if (!(dev->flags&IFF_UP)) | |
209 | return -ENETDOWN; | |
210 | nh->nh_dev = dev; | |
211 | dev_hold(dev); | |
212 | nh->nh_scope = RT_SCOPE_LINK; | |
213 | return 0; | |
214 | } | |
215 | ||
bef55aeb DM |
216 | memset(&fld, 0, sizeof(fld)); |
217 | fld.daddr = nh->nh_gw; | |
218 | fld.flowidn_oif = nh->nh_oif; | |
219 | fld.flowidn_scope = r->rtm_scope + 1; | |
1da177e4 | 220 | |
bef55aeb DM |
221 | if (fld.flowidn_scope < RT_SCOPE_LINK) |
222 | fld.flowidn_scope = RT_SCOPE_LINK; | |
1da177e4 | 223 | |
bef55aeb | 224 | if ((err = dn_fib_lookup(&fld, &res)) != 0) |
1da177e4 LT |
225 | return err; |
226 | ||
227 | err = -EINVAL; | |
228 | if (res.type != RTN_UNICAST && res.type != RTN_LOCAL) | |
229 | goto out; | |
230 | nh->nh_scope = res.scope; | |
231 | nh->nh_oif = DN_FIB_RES_OIF(res); | |
232 | nh->nh_dev = DN_FIB_RES_DEV(res); | |
233 | if (nh->nh_dev == NULL) | |
234 | goto out; | |
235 | dev_hold(nh->nh_dev); | |
236 | err = -ENETDOWN; | |
237 | if (!(nh->nh_dev->flags & IFF_UP)) | |
238 | goto out; | |
239 | err = 0; | |
240 | out: | |
241 | dn_fib_res_put(&res); | |
242 | return err; | |
243 | } else { | |
244 | struct net_device *dev; | |
245 | ||
246 | if (nh->nh_flags&(RTNH_F_PERVASIVE|RTNH_F_ONLINK)) | |
247 | return -EINVAL; | |
248 | ||
881d966b | 249 | dev = __dev_get_by_index(&init_net, nh->nh_oif); |
1da177e4 LT |
250 | if (dev == NULL || dev->dn_ptr == NULL) |
251 | return -ENODEV; | |
252 | if (!(dev->flags&IFF_UP)) | |
253 | return -ENETDOWN; | |
254 | nh->nh_dev = dev; | |
255 | dev_hold(nh->nh_dev); | |
256 | nh->nh_scope = RT_SCOPE_HOST; | |
257 | } | |
258 | ||
259 | return 0; | |
260 | } | |
261 | ||
262 | ||
58d7d8f9 TG |
263 | struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r, struct nlattr *attrs[], |
264 | const struct nlmsghdr *nlh, int *errp) | |
1da177e4 LT |
265 | { |
266 | int err; | |
267 | struct dn_fib_info *fi = NULL; | |
268 | struct dn_fib_info *ofi; | |
269 | int nhs = 1; | |
270 | ||
a9791011 TG |
271 | if (r->rtm_type > RTN_MAX) |
272 | goto err_inval; | |
273 | ||
1da177e4 LT |
274 | if (dn_fib_props[r->rtm_type].scope > r->rtm_scope) |
275 | goto err_inval; | |
276 | ||
58d7d8f9 TG |
277 | if (attrs[RTA_MULTIPATH] && |
278 | (nhs = dn_fib_count_nhs(attrs[RTA_MULTIPATH])) == 0) | |
279 | goto err_inval; | |
1da177e4 | 280 | |
0da974f4 | 281 | fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct dn_fib_nh), GFP_KERNEL); |
1da177e4 LT |
282 | err = -ENOBUFS; |
283 | if (fi == NULL) | |
284 | goto failure; | |
1da177e4 LT |
285 | |
286 | fi->fib_protocol = r->rtm_protocol; | |
287 | fi->fib_nhs = nhs; | |
288 | fi->fib_flags = r->rtm_flags; | |
1da177e4 | 289 | |
58d7d8f9 TG |
290 | if (attrs[RTA_PRIORITY]) |
291 | fi->fib_priority = nla_get_u32(attrs[RTA_PRIORITY]); | |
292 | ||
293 | if (attrs[RTA_METRICS]) { | |
294 | struct nlattr *attr; | |
295 | int rem; | |
95c96174 | 296 | |
58d7d8f9 TG |
297 | nla_for_each_nested(attr, attrs[RTA_METRICS], rem) { |
298 | int type = nla_type(attr); | |
299 | ||
300 | if (type) { | |
ea697639 DB |
301 | if (type > RTAX_MAX || type == RTAX_CC_ALGO || |
302 | nla_len(attr) < 4) | |
1da177e4 | 303 | goto err_inval; |
58d7d8f9 TG |
304 | |
305 | fi->fib_metrics[type-1] = nla_get_u32(attr); | |
1da177e4 | 306 | } |
1da177e4 LT |
307 | } |
308 | } | |
1da177e4 | 309 | |
58d7d8f9 TG |
310 | if (attrs[RTA_PREFSRC]) |
311 | fi->fib_prefsrc = nla_get_le16(attrs[RTA_PREFSRC]); | |
312 | ||
313 | if (attrs[RTA_MULTIPATH]) { | |
314 | if ((err = dn_fib_get_nhs(fi, attrs[RTA_MULTIPATH], r)) != 0) | |
1da177e4 | 315 | goto failure; |
58d7d8f9 TG |
316 | |
317 | if (attrs[RTA_OIF] && | |
318 | fi->fib_nh->nh_oif != nla_get_u32(attrs[RTA_OIF])) | |
1da177e4 | 319 | goto err_inval; |
58d7d8f9 TG |
320 | |
321 | if (attrs[RTA_GATEWAY] && | |
322 | fi->fib_nh->nh_gw != nla_get_le16(attrs[RTA_GATEWAY])) | |
1da177e4 LT |
323 | goto err_inval; |
324 | } else { | |
325 | struct dn_fib_nh *nh = fi->fib_nh; | |
58d7d8f9 TG |
326 | |
327 | if (attrs[RTA_OIF]) | |
328 | nh->nh_oif = nla_get_u32(attrs[RTA_OIF]); | |
329 | ||
330 | if (attrs[RTA_GATEWAY]) | |
331 | nh->nh_gw = nla_get_le16(attrs[RTA_GATEWAY]); | |
332 | ||
1da177e4 LT |
333 | nh->nh_flags = r->rtm_flags; |
334 | nh->nh_weight = 1; | |
335 | } | |
336 | ||
337 | if (r->rtm_type == RTN_NAT) { | |
58d7d8f9 | 338 | if (!attrs[RTA_GATEWAY] || nhs != 1 || attrs[RTA_OIF]) |
1da177e4 | 339 | goto err_inval; |
58d7d8f9 TG |
340 | |
341 | fi->fib_nh->nh_gw = nla_get_le16(attrs[RTA_GATEWAY]); | |
1da177e4 LT |
342 | goto link_it; |
343 | } | |
344 | ||
345 | if (dn_fib_props[r->rtm_type].error) { | |
58d7d8f9 | 346 | if (attrs[RTA_GATEWAY] || attrs[RTA_OIF] || attrs[RTA_MULTIPATH]) |
1da177e4 | 347 | goto err_inval; |
58d7d8f9 | 348 | |
1da177e4 LT |
349 | goto link_it; |
350 | } | |
351 | ||
352 | if (r->rtm_scope > RT_SCOPE_HOST) | |
353 | goto err_inval; | |
354 | ||
355 | if (r->rtm_scope == RT_SCOPE_HOST) { | |
356 | struct dn_fib_nh *nh = fi->fib_nh; | |
357 | ||
358 | /* Local address is added */ | |
359 | if (nhs != 1 || nh->nh_gw) | |
360 | goto err_inval; | |
361 | nh->nh_scope = RT_SCOPE_NOWHERE; | |
881d966b | 362 | nh->nh_dev = dev_get_by_index(&init_net, fi->fib_nh->nh_oif); |
1da177e4 LT |
363 | err = -ENODEV; |
364 | if (nh->nh_dev == NULL) | |
365 | goto failure; | |
366 | } else { | |
367 | change_nexthops(fi) { | |
368 | if ((err = dn_fib_check_nh(r, fi, nh)) != 0) | |
369 | goto failure; | |
370 | } endfor_nexthops(fi) | |
371 | } | |
372 | ||
373 | if (fi->fib_prefsrc) { | |
58d7d8f9 TG |
374 | if (r->rtm_type != RTN_LOCAL || !attrs[RTA_DST] || |
375 | fi->fib_prefsrc != nla_get_le16(attrs[RTA_DST])) | |
1da177e4 LT |
376 | if (dnet_addr_type(fi->fib_prefsrc) != RTN_LOCAL) |
377 | goto err_inval; | |
378 | } | |
379 | ||
380 | link_it: | |
381 | if ((ofi = dn_fib_find_info(fi)) != NULL) { | |
382 | fi->fib_dead = 1; | |
383 | dn_fib_free_info(fi); | |
384 | ofi->fib_treeref++; | |
385 | return ofi; | |
386 | } | |
387 | ||
388 | fi->fib_treeref++; | |
389 | atomic_inc(&fi->fib_clntref); | |
a22ec367 | 390 | spin_lock(&dn_fib_info_lock); |
1da177e4 LT |
391 | fi->fib_next = dn_fib_info_list; |
392 | fi->fib_prev = NULL; | |
393 | if (dn_fib_info_list) | |
394 | dn_fib_info_list->fib_prev = fi; | |
395 | dn_fib_info_list = fi; | |
a22ec367 | 396 | spin_unlock(&dn_fib_info_lock); |
1da177e4 LT |
397 | return fi; |
398 | ||
399 | err_inval: | |
400 | err = -EINVAL; | |
401 | ||
402 | failure: | |
403 | *errp = err; | |
404 | if (fi) { | |
405 | fi->fib_dead = 1; | |
406 | dn_fib_free_info(fi); | |
407 | } | |
408 | ||
409 | return NULL; | |
410 | } | |
411 | ||
bef55aeb | 412 | int dn_fib_semantic_match(int type, struct dn_fib_info *fi, const struct flowidn *fld, struct dn_fib_res *res) |
1da177e4 LT |
413 | { |
414 | int err = dn_fib_props[type].error; | |
415 | ||
416 | if (err == 0) { | |
417 | if (fi->fib_flags & RTNH_F_DEAD) | |
418 | return 1; | |
419 | ||
420 | res->fi = fi; | |
421 | ||
06f8fe11 JP |
422 | switch (type) { |
423 | case RTN_NAT: | |
424 | DN_FIB_RES_RESET(*res); | |
425 | atomic_inc(&fi->fib_clntref); | |
426 | return 0; | |
427 | case RTN_UNICAST: | |
428 | case RTN_LOCAL: | |
429 | for_nexthops(fi) { | |
430 | if (nh->nh_flags & RTNH_F_DEAD) | |
431 | continue; | |
432 | if (!fld->flowidn_oif || | |
433 | fld->flowidn_oif == nh->nh_oif) | |
434 | break; | |
435 | } | |
436 | if (nhsel < fi->fib_nhs) { | |
437 | res->nh_sel = nhsel; | |
1da177e4 LT |
438 | atomic_inc(&fi->fib_clntref); |
439 | return 0; | |
06f8fe11 JP |
440 | } |
441 | endfor_nexthops(fi); | |
442 | res->fi = NULL; | |
443 | return 1; | |
444 | default: | |
e87cc472 JP |
445 | net_err_ratelimited("DECnet: impossible routing event : dn_fib_semantic_match type=%d\n", |
446 | type); | |
06f8fe11 JP |
447 | res->fi = NULL; |
448 | return -EINVAL; | |
1da177e4 LT |
449 | } |
450 | } | |
451 | return err; | |
452 | } | |
453 | ||
bef55aeb | 454 | void dn_fib_select_multipath(const struct flowidn *fld, struct dn_fib_res *res) |
1da177e4 LT |
455 | { |
456 | struct dn_fib_info *fi = res->fi; | |
457 | int w; | |
458 | ||
459 | spin_lock_bh(&dn_fib_multipath_lock); | |
460 | if (fi->fib_power <= 0) { | |
461 | int power = 0; | |
462 | change_nexthops(fi) { | |
463 | if (!(nh->nh_flags&RTNH_F_DEAD)) { | |
464 | power += nh->nh_weight; | |
465 | nh->nh_power = nh->nh_weight; | |
466 | } | |
467 | } endfor_nexthops(fi); | |
468 | fi->fib_power = power; | |
469 | if (power < 0) { | |
470 | spin_unlock_bh(&dn_fib_multipath_lock); | |
471 | res->nh_sel = 0; | |
472 | return; | |
473 | } | |
474 | } | |
475 | ||
476 | w = jiffies % fi->fib_power; | |
477 | ||
478 | change_nexthops(fi) { | |
479 | if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) { | |
480 | if ((w -= nh->nh_power) <= 0) { | |
481 | nh->nh_power--; | |
482 | fi->fib_power--; | |
483 | res->nh_sel = nhsel; | |
484 | spin_unlock_bh(&dn_fib_multipath_lock); | |
485 | return; | |
486 | } | |
487 | } | |
488 | } endfor_nexthops(fi); | |
489 | res->nh_sel = 0; | |
490 | spin_unlock_bh(&dn_fib_multipath_lock); | |
491 | } | |
492 | ||
58d7d8f9 | 493 | static inline u32 rtm_get_table(struct nlattr *attrs[], u8 table) |
4c3af034 | 494 | { |
58d7d8f9 TG |
495 | if (attrs[RTA_TABLE]) |
496 | table = nla_get_u32(attrs[RTA_TABLE]); | |
4c3af034 TG |
497 | |
498 | return table; | |
499 | } | |
500 | ||
661d2967 | 501 | static int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 502 | { |
3b1e0a65 | 503 | struct net *net = sock_net(skb->sk); |
1da177e4 | 504 | struct dn_fib_table *tb; |
58d7d8f9 TG |
505 | struct rtmsg *r = nlmsg_data(nlh); |
506 | struct nlattr *attrs[RTA_MAX+1]; | |
507 | int err; | |
1da177e4 | 508 | |
90f62cf3 | 509 | if (!netlink_capable(skb, CAP_NET_ADMIN)) |
dfc47ef8 EB |
510 | return -EPERM; |
511 | ||
09ad9bc7 | 512 | if (!net_eq(net, &init_net)) |
b854272b DL |
513 | return -EINVAL; |
514 | ||
58d7d8f9 TG |
515 | err = nlmsg_parse(nlh, sizeof(*r), attrs, RTA_MAX, rtm_dn_policy); |
516 | if (err < 0) | |
517 | return err; | |
1da177e4 | 518 | |
58d7d8f9 TG |
519 | tb = dn_fib_get_table(rtm_get_table(attrs, r->rtm_table), 0); |
520 | if (!tb) | |
521 | return -ESRCH; | |
1da177e4 | 522 | |
58d7d8f9 | 523 | return tb->delete(tb, r, attrs, nlh, &NETLINK_CB(skb)); |
1da177e4 LT |
524 | } |
525 | ||
661d2967 | 526 | static int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh) |
1da177e4 | 527 | { |
3b1e0a65 | 528 | struct net *net = sock_net(skb->sk); |
1da177e4 | 529 | struct dn_fib_table *tb; |
58d7d8f9 TG |
530 | struct rtmsg *r = nlmsg_data(nlh); |
531 | struct nlattr *attrs[RTA_MAX+1]; | |
532 | int err; | |
1da177e4 | 533 | |
90f62cf3 | 534 | if (!netlink_capable(skb, CAP_NET_ADMIN)) |
dfc47ef8 EB |
535 | return -EPERM; |
536 | ||
09ad9bc7 | 537 | if (!net_eq(net, &init_net)) |
b854272b DL |
538 | return -EINVAL; |
539 | ||
58d7d8f9 TG |
540 | err = nlmsg_parse(nlh, sizeof(*r), attrs, RTA_MAX, rtm_dn_policy); |
541 | if (err < 0) | |
542 | return err; | |
1da177e4 | 543 | |
58d7d8f9 TG |
544 | tb = dn_fib_get_table(rtm_get_table(attrs, r->rtm_table), 1); |
545 | if (!tb) | |
546 | return -ENOBUFS; | |
1da177e4 | 547 | |
58d7d8f9 | 548 | return tb->insert(tb, r, attrs, nlh, &NETLINK_CB(skb)); |
1da177e4 LT |
549 | } |
550 | ||
c4ea94ab | 551 | static void fib_magic(int cmd, int type, __le16 dst, int dst_len, struct dn_ifaddr *ifa) |
1da177e4 LT |
552 | { |
553 | struct dn_fib_table *tb; | |
554 | struct { | |
555 | struct nlmsghdr nlh; | |
556 | struct rtmsg rtm; | |
557 | } req; | |
58d7d8f9 TG |
558 | struct { |
559 | struct nlattr hdr; | |
560 | __le16 dst; | |
561 | } dst_attr = { | |
562 | .dst = dst, | |
563 | }; | |
564 | struct { | |
565 | struct nlattr hdr; | |
566 | __le16 prefsrc; | |
567 | } prefsrc_attr = { | |
568 | .prefsrc = ifa->ifa_local, | |
569 | }; | |
570 | struct { | |
571 | struct nlattr hdr; | |
572 | u32 oif; | |
573 | } oif_attr = { | |
574 | .oif = ifa->ifa_dev->dev->ifindex, | |
575 | }; | |
576 | struct nlattr *attrs[RTA_MAX+1] = { | |
577 | [RTA_DST] = (struct nlattr *) &dst_attr, | |
578 | [RTA_PREFSRC] = (struct nlattr * ) &prefsrc_attr, | |
579 | [RTA_OIF] = (struct nlattr *) &oif_attr, | |
580 | }; | |
1da177e4 LT |
581 | |
582 | memset(&req.rtm, 0, sizeof(req.rtm)); | |
1da177e4 LT |
583 | |
584 | if (type == RTN_UNICAST) | |
585 | tb = dn_fib_get_table(RT_MIN_TABLE, 1); | |
586 | else | |
587 | tb = dn_fib_get_table(RT_TABLE_LOCAL, 1); | |
588 | ||
589 | if (tb == NULL) | |
590 | return; | |
591 | ||
592 | req.nlh.nlmsg_len = sizeof(req); | |
593 | req.nlh.nlmsg_type = cmd; | |
594 | req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND; | |
595 | req.nlh.nlmsg_pid = 0; | |
596 | req.nlh.nlmsg_seq = 0; | |
597 | ||
598 | req.rtm.rtm_dst_len = dst_len; | |
599 | req.rtm.rtm_table = tb->n; | |
600 | req.rtm.rtm_protocol = RTPROT_KERNEL; | |
601 | req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST); | |
602 | req.rtm.rtm_type = type; | |
603 | ||
1da177e4 | 604 | if (cmd == RTM_NEWROUTE) |
58d7d8f9 | 605 | tb->insert(tb, &req.rtm, attrs, &req.nlh, NULL); |
1da177e4 | 606 | else |
58d7d8f9 | 607 | tb->delete(tb, &req.rtm, attrs, &req.nlh, NULL); |
1da177e4 LT |
608 | } |
609 | ||
610 | static void dn_fib_add_ifaddr(struct dn_ifaddr *ifa) | |
611 | { | |
612 | ||
613 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa); | |
614 | ||
615 | #if 0 | |
616 | if (!(dev->flags&IFF_UP)) | |
617 | return; | |
618 | /* In the future, we will want to add default routes here */ | |
619 | ||
620 | #endif | |
621 | } | |
622 | ||
623 | static void dn_fib_del_ifaddr(struct dn_ifaddr *ifa) | |
624 | { | |
625 | int found_it = 0; | |
626 | struct net_device *dev; | |
627 | struct dn_dev *dn_db; | |
628 | struct dn_ifaddr *ifa2; | |
629 | ||
630 | ASSERT_RTNL(); | |
631 | ||
632 | /* Scan device list */ | |
c6d14c84 ED |
633 | rcu_read_lock(); |
634 | for_each_netdev_rcu(&init_net, dev) { | |
fc766e4c | 635 | dn_db = rcu_dereference(dev->dn_ptr); |
1da177e4 LT |
636 | if (dn_db == NULL) |
637 | continue; | |
fc766e4c ED |
638 | for (ifa2 = rcu_dereference(dn_db->ifa_list); |
639 | ifa2 != NULL; | |
640 | ifa2 = rcu_dereference(ifa2->ifa_next)) { | |
1da177e4 LT |
641 | if (ifa2->ifa_local == ifa->ifa_local) { |
642 | found_it = 1; | |
643 | break; | |
644 | } | |
645 | } | |
646 | } | |
c6d14c84 | 647 | rcu_read_unlock(); |
1da177e4 LT |
648 | |
649 | if (found_it == 0) { | |
650 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa); | |
651 | ||
652 | if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) { | |
653 | if (dn_fib_sync_down(ifa->ifa_local, NULL, 0)) | |
654 | dn_fib_flush(); | |
655 | } | |
656 | } | |
657 | } | |
658 | ||
659 | static void dn_fib_disable_addr(struct net_device *dev, int force) | |
660 | { | |
661 | if (dn_fib_sync_down(0, dev, force)) | |
662 | dn_fib_flush(); | |
663 | dn_rt_cache_flush(0); | |
664 | neigh_ifdown(&dn_neigh_table, dev); | |
665 | } | |
666 | ||
667 | static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
668 | { | |
669 | struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr; | |
670 | ||
06f8fe11 JP |
671 | switch (event) { |
672 | case NETDEV_UP: | |
673 | dn_fib_add_ifaddr(ifa); | |
674 | dn_fib_sync_up(ifa->ifa_dev->dev); | |
675 | dn_rt_cache_flush(-1); | |
676 | break; | |
677 | case NETDEV_DOWN: | |
678 | dn_fib_del_ifaddr(ifa); | |
679 | if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) { | |
680 | dn_fib_disable_addr(ifa->ifa_dev->dev, 1); | |
681 | } else { | |
1da177e4 | 682 | dn_rt_cache_flush(-1); |
06f8fe11 JP |
683 | } |
684 | break; | |
1da177e4 LT |
685 | } |
686 | return NOTIFY_DONE; | |
687 | } | |
688 | ||
2aa7f36c | 689 | static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force) |
1da177e4 | 690 | { |
429eb0fa YH |
691 | int ret = 0; |
692 | int scope = RT_SCOPE_NOWHERE; | |
693 | ||
694 | if (force) | |
695 | scope = -1; | |
696 | ||
697 | for_fib_info() { | |
698 | /* | |
699 | * This makes no sense for DECnet.... we will almost | |
700 | * certainly have more than one local address the same | |
701 | * over all our interfaces. It needs thinking about | |
702 | * some more. | |
703 | */ | |
704 | if (local && fi->fib_prefsrc == local) { | |
705 | fi->fib_flags |= RTNH_F_DEAD; | |
706 | ret++; | |
707 | } else if (dev && fi->fib_nhs) { | |
708 | int dead = 0; | |
709 | ||
710 | change_nexthops(fi) { | |
711 | if (nh->nh_flags&RTNH_F_DEAD) | |
712 | dead++; | |
713 | else if (nh->nh_dev == dev && | |
714 | nh->nh_scope != scope) { | |
1da177e4 | 715 | spin_lock_bh(&dn_fib_multipath_lock); |
429eb0fa YH |
716 | nh->nh_flags |= RTNH_F_DEAD; |
717 | fi->fib_power -= nh->nh_power; | |
718 | nh->nh_power = 0; | |
1da177e4 | 719 | spin_unlock_bh(&dn_fib_multipath_lock); |
429eb0fa YH |
720 | dead++; |
721 | } | |
722 | } endfor_nexthops(fi) | |
723 | if (dead == fi->fib_nhs) { | |
724 | fi->fib_flags |= RTNH_F_DEAD; | |
725 | ret++; | |
726 | } | |
727 | } | |
728 | } endfor_fib_info(); | |
729 | return ret; | |
1da177e4 LT |
730 | } |
731 | ||
732 | ||
2aa7f36c | 733 | static int dn_fib_sync_up(struct net_device *dev) |
1da177e4 | 734 | { |
429eb0fa YH |
735 | int ret = 0; |
736 | ||
737 | if (!(dev->flags&IFF_UP)) | |
738 | return 0; | |
739 | ||
740 | for_fib_info() { | |
741 | int alive = 0; | |
742 | ||
743 | change_nexthops(fi) { | |
744 | if (!(nh->nh_flags&RTNH_F_DEAD)) { | |
745 | alive++; | |
746 | continue; | |
747 | } | |
748 | if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP)) | |
749 | continue; | |
750 | if (nh->nh_dev != dev || dev->dn_ptr == NULL) | |
751 | continue; | |
752 | alive++; | |
1da177e4 | 753 | spin_lock_bh(&dn_fib_multipath_lock); |
429eb0fa YH |
754 | nh->nh_power = 0; |
755 | nh->nh_flags &= ~RTNH_F_DEAD; | |
1da177e4 | 756 | spin_unlock_bh(&dn_fib_multipath_lock); |
429eb0fa YH |
757 | } endfor_nexthops(fi); |
758 | ||
759 | if (alive > 0) { | |
760 | fi->fib_flags &= ~RTNH_F_DEAD; | |
761 | ret++; | |
762 | } | |
763 | } endfor_fib_info(); | |
764 | return ret; | |
1da177e4 LT |
765 | } |
766 | ||
1da177e4 LT |
767 | static struct notifier_block dn_fib_dnaddr_notifier = { |
768 | .notifier_call = dn_fib_dnaddr_event, | |
769 | }; | |
770 | ||
771 | void __exit dn_fib_cleanup(void) | |
772 | { | |
773 | dn_fib_table_cleanup(); | |
774 | dn_fib_rules_cleanup(); | |
775 | ||
776 | unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier); | |
777 | } | |
778 | ||
779 | ||
780 | void __init dn_fib_init(void) | |
781 | { | |
1da177e4 LT |
782 | dn_fib_table_init(); |
783 | dn_fib_rules_init(); | |
784 | ||
785 | register_dnaddr_notifier(&dn_fib_dnaddr_notifier); | |
fa34ddd7 | 786 | |
c7ac8679 GR |
787 | rtnl_register(PF_DECnet, RTM_NEWROUTE, dn_fib_rtm_newroute, NULL, NULL); |
788 | rtnl_register(PF_DECnet, RTM_DELROUTE, dn_fib_rtm_delroute, NULL, NULL); | |
1da177e4 LT |
789 | } |
790 | ||
791 |