Commit | Line | Data |
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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> | |
23 | #include <linux/sockios.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/skbuff.h> | |
26 | #include <linux/netlink.h> | |
27 | #include <linux/rtnetlink.h> | |
28 | #include <linux/proc_fs.h> | |
29 | #include <linux/netdevice.h> | |
30 | #include <linux/timer.h> | |
31 | #include <linux/spinlock.h> | |
32 | #include <asm/atomic.h> | |
33 | #include <asm/uaccess.h> | |
34 | #include <net/neighbour.h> | |
35 | #include <net/dst.h> | |
36 | #include <net/flow.h> | |
a8731cbf | 37 | #include <net/fib_rules.h> |
1da177e4 LT |
38 | #include <net/dn.h> |
39 | #include <net/dn_route.h> | |
40 | #include <net/dn_fib.h> | |
41 | #include <net/dn_neigh.h> | |
42 | #include <net/dn_dev.h> | |
43 | ||
44 | #define RT_MIN_TABLE 1 | |
45 | ||
46 | #define for_fib_info() { struct dn_fib_info *fi;\ | |
47 | for(fi = dn_fib_info_list; fi; fi = fi->fib_next) | |
48 | #define endfor_fib_info() } | |
49 | ||
50 | #define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\ | |
51 | for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++) | |
52 | ||
53 | #define change_nexthops(fi) { int nhsel; struct dn_fib_nh *nh;\ | |
54 | for(nhsel = 0, nh = (struct dn_fib_nh *)((fi)->fib_nh); nhsel < (fi)->fib_nhs; nh++, nhsel++) | |
55 | ||
56 | #define endfor_nexthops(fi) } | |
57 | ||
1da177e4 LT |
58 | static DEFINE_SPINLOCK(dn_fib_multipath_lock); |
59 | static struct dn_fib_info *dn_fib_info_list; | |
a22ec367 | 60 | static DEFINE_SPINLOCK(dn_fib_info_lock); |
1da177e4 LT |
61 | |
62 | static struct | |
63 | { | |
64 | int error; | |
65 | u8 scope; | |
a9791011 | 66 | } dn_fib_props[RTN_MAX+1] = { |
1da177e4 LT |
67 | [RTN_UNSPEC] = { .error = 0, .scope = RT_SCOPE_NOWHERE }, |
68 | [RTN_UNICAST] = { .error = 0, .scope = RT_SCOPE_UNIVERSE }, | |
69 | [RTN_LOCAL] = { .error = 0, .scope = RT_SCOPE_HOST }, | |
70 | [RTN_BROADCAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE }, | |
71 | [RTN_ANYCAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE }, | |
72 | [RTN_MULTICAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE }, | |
73 | [RTN_BLACKHOLE] = { .error = -EINVAL, .scope = RT_SCOPE_UNIVERSE }, | |
74 | [RTN_UNREACHABLE] = { .error = -EHOSTUNREACH, .scope = RT_SCOPE_UNIVERSE }, | |
75 | [RTN_PROHIBIT] = { .error = -EACCES, .scope = RT_SCOPE_UNIVERSE }, | |
76 | [RTN_THROW] = { .error = -EAGAIN, .scope = RT_SCOPE_UNIVERSE }, | |
77 | [RTN_NAT] = { .error = 0, .scope = RT_SCOPE_NOWHERE }, | |
78 | [RTN_XRESOLVE] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE }, | |
79 | }; | |
80 | ||
2aa7f36c AB |
81 | static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force); |
82 | static int dn_fib_sync_up(struct net_device *dev); | |
83 | ||
1da177e4 LT |
84 | void dn_fib_free_info(struct dn_fib_info *fi) |
85 | { | |
86 | if (fi->fib_dead == 0) { | |
87 | printk(KERN_DEBUG "DECnet: BUG! Attempt to free alive dn_fib_info\n"); | |
88 | return; | |
89 | } | |
90 | ||
91 | change_nexthops(fi) { | |
92 | if (nh->nh_dev) | |
93 | dev_put(nh->nh_dev); | |
94 | nh->nh_dev = NULL; | |
95 | } endfor_nexthops(fi); | |
96 | kfree(fi); | |
97 | } | |
98 | ||
99 | void dn_fib_release_info(struct dn_fib_info *fi) | |
100 | { | |
a22ec367 | 101 | spin_lock(&dn_fib_info_lock); |
1da177e4 LT |
102 | if (fi && --fi->fib_treeref == 0) { |
103 | if (fi->fib_next) | |
104 | fi->fib_next->fib_prev = fi->fib_prev; | |
105 | if (fi->fib_prev) | |
106 | fi->fib_prev->fib_next = fi->fib_next; | |
107 | if (fi == dn_fib_info_list) | |
108 | dn_fib_info_list = fi->fib_next; | |
109 | fi->fib_dead = 1; | |
110 | dn_fib_info_put(fi); | |
111 | } | |
a22ec367 | 112 | spin_unlock(&dn_fib_info_lock); |
1da177e4 LT |
113 | } |
114 | ||
115 | static inline int dn_fib_nh_comp(const struct dn_fib_info *fi, const struct dn_fib_info *ofi) | |
116 | { | |
117 | const struct dn_fib_nh *onh = ofi->fib_nh; | |
118 | ||
119 | for_nexthops(fi) { | |
120 | if (nh->nh_oif != onh->nh_oif || | |
121 | nh->nh_gw != onh->nh_gw || | |
122 | nh->nh_scope != onh->nh_scope || | |
123 | nh->nh_weight != onh->nh_weight || | |
124 | ((nh->nh_flags^onh->nh_flags)&~RTNH_F_DEAD)) | |
125 | return -1; | |
126 | onh++; | |
127 | } endfor_nexthops(fi); | |
128 | return 0; | |
129 | } | |
130 | ||
131 | static inline struct dn_fib_info *dn_fib_find_info(const struct dn_fib_info *nfi) | |
132 | { | |
133 | for_fib_info() { | |
134 | if (fi->fib_nhs != nfi->fib_nhs) | |
135 | continue; | |
136 | if (nfi->fib_protocol == fi->fib_protocol && | |
137 | nfi->fib_prefsrc == fi->fib_prefsrc && | |
138 | nfi->fib_priority == fi->fib_priority && | |
139 | memcmp(nfi->fib_metrics, fi->fib_metrics, sizeof(fi->fib_metrics)) == 0 && | |
140 | ((nfi->fib_flags^fi->fib_flags)&~RTNH_F_DEAD) == 0 && | |
141 | (nfi->fib_nhs == 0 || dn_fib_nh_comp(fi, nfi) == 0)) | |
142 | return fi; | |
143 | } endfor_fib_info(); | |
144 | return NULL; | |
145 | } | |
146 | ||
c4ea94ab | 147 | __le16 dn_fib_get_attr16(struct rtattr *attr, int attrlen, int type) |
1da177e4 LT |
148 | { |
149 | while(RTA_OK(attr,attrlen)) { | |
150 | if (attr->rta_type == type) | |
c4ea94ab | 151 | return *(__le16*)RTA_DATA(attr); |
1da177e4 LT |
152 | attr = RTA_NEXT(attr, attrlen); |
153 | } | |
154 | ||
155 | return 0; | |
156 | } | |
157 | ||
158 | static int dn_fib_count_nhs(struct rtattr *rta) | |
159 | { | |
160 | int nhs = 0; | |
161 | struct rtnexthop *nhp = RTA_DATA(rta); | |
162 | int nhlen = RTA_PAYLOAD(rta); | |
163 | ||
164 | while(nhlen >= (int)sizeof(struct rtnexthop)) { | |
165 | if ((nhlen -= nhp->rtnh_len) < 0) | |
166 | return 0; | |
167 | nhs++; | |
168 | nhp = RTNH_NEXT(nhp); | |
169 | } | |
170 | ||
171 | return nhs; | |
172 | } | |
173 | ||
174 | static int dn_fib_get_nhs(struct dn_fib_info *fi, const struct rtattr *rta, const struct rtmsg *r) | |
175 | { | |
176 | struct rtnexthop *nhp = RTA_DATA(rta); | |
177 | int nhlen = RTA_PAYLOAD(rta); | |
178 | ||
179 | change_nexthops(fi) { | |
180 | int attrlen = nhlen - sizeof(struct rtnexthop); | |
181 | if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0) | |
182 | return -EINVAL; | |
183 | ||
184 | nh->nh_flags = (r->rtm_flags&~0xFF) | nhp->rtnh_flags; | |
185 | nh->nh_oif = nhp->rtnh_ifindex; | |
186 | nh->nh_weight = nhp->rtnh_hops + 1; | |
187 | ||
188 | if (attrlen) { | |
189 | nh->nh_gw = dn_fib_get_attr16(RTNH_DATA(nhp), attrlen, RTA_GATEWAY); | |
190 | } | |
191 | nhp = RTNH_NEXT(nhp); | |
192 | } endfor_nexthops(fi); | |
193 | ||
194 | return 0; | |
195 | } | |
196 | ||
197 | ||
198 | static int dn_fib_check_nh(const struct rtmsg *r, struct dn_fib_info *fi, struct dn_fib_nh *nh) | |
199 | { | |
200 | int err; | |
201 | ||
202 | if (nh->nh_gw) { | |
203 | struct flowi fl; | |
204 | struct dn_fib_res res; | |
205 | ||
1da177e4 LT |
206 | if (nh->nh_flags&RTNH_F_ONLINK) { |
207 | struct net_device *dev; | |
208 | ||
209 | if (r->rtm_scope >= RT_SCOPE_LINK) | |
210 | return -EINVAL; | |
211 | if (dnet_addr_type(nh->nh_gw) != RTN_UNICAST) | |
212 | return -EINVAL; | |
881d966b | 213 | if ((dev = __dev_get_by_index(&init_net, nh->nh_oif)) == NULL) |
1da177e4 LT |
214 | return -ENODEV; |
215 | if (!(dev->flags&IFF_UP)) | |
216 | return -ENETDOWN; | |
217 | nh->nh_dev = dev; | |
218 | dev_hold(dev); | |
219 | nh->nh_scope = RT_SCOPE_LINK; | |
220 | return 0; | |
221 | } | |
222 | ||
223 | memset(&fl, 0, sizeof(fl)); | |
224 | fl.fld_dst = nh->nh_gw; | |
225 | fl.oif = nh->nh_oif; | |
226 | fl.fld_scope = r->rtm_scope + 1; | |
227 | ||
228 | if (fl.fld_scope < RT_SCOPE_LINK) | |
229 | fl.fld_scope = RT_SCOPE_LINK; | |
230 | ||
231 | if ((err = dn_fib_lookup(&fl, &res)) != 0) | |
232 | return err; | |
233 | ||
234 | err = -EINVAL; | |
235 | if (res.type != RTN_UNICAST && res.type != RTN_LOCAL) | |
236 | goto out; | |
237 | nh->nh_scope = res.scope; | |
238 | nh->nh_oif = DN_FIB_RES_OIF(res); | |
239 | nh->nh_dev = DN_FIB_RES_DEV(res); | |
240 | if (nh->nh_dev == NULL) | |
241 | goto out; | |
242 | dev_hold(nh->nh_dev); | |
243 | err = -ENETDOWN; | |
244 | if (!(nh->nh_dev->flags & IFF_UP)) | |
245 | goto out; | |
246 | err = 0; | |
247 | out: | |
248 | dn_fib_res_put(&res); | |
249 | return err; | |
250 | } else { | |
251 | struct net_device *dev; | |
252 | ||
253 | if (nh->nh_flags&(RTNH_F_PERVASIVE|RTNH_F_ONLINK)) | |
254 | return -EINVAL; | |
255 | ||
881d966b | 256 | dev = __dev_get_by_index(&init_net, nh->nh_oif); |
1da177e4 LT |
257 | if (dev == NULL || dev->dn_ptr == NULL) |
258 | return -ENODEV; | |
259 | if (!(dev->flags&IFF_UP)) | |
260 | return -ENETDOWN; | |
261 | nh->nh_dev = dev; | |
262 | dev_hold(nh->nh_dev); | |
263 | nh->nh_scope = RT_SCOPE_HOST; | |
264 | } | |
265 | ||
266 | return 0; | |
267 | } | |
268 | ||
269 | ||
270 | struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r, struct dn_kern_rta *rta, const struct nlmsghdr *nlh, int *errp) | |
271 | { | |
272 | int err; | |
273 | struct dn_fib_info *fi = NULL; | |
274 | struct dn_fib_info *ofi; | |
275 | int nhs = 1; | |
276 | ||
a9791011 TG |
277 | if (r->rtm_type > RTN_MAX) |
278 | goto err_inval; | |
279 | ||
1da177e4 LT |
280 | if (dn_fib_props[r->rtm_type].scope > r->rtm_scope) |
281 | goto err_inval; | |
282 | ||
283 | if (rta->rta_mp) { | |
284 | nhs = dn_fib_count_nhs(rta->rta_mp); | |
285 | if (nhs == 0) | |
286 | goto err_inval; | |
287 | } | |
288 | ||
0da974f4 | 289 | fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct dn_fib_nh), GFP_KERNEL); |
1da177e4 LT |
290 | err = -ENOBUFS; |
291 | if (fi == NULL) | |
292 | goto failure; | |
1da177e4 LT |
293 | |
294 | fi->fib_protocol = r->rtm_protocol; | |
295 | fi->fib_nhs = nhs; | |
296 | fi->fib_flags = r->rtm_flags; | |
297 | if (rta->rta_priority) | |
298 | fi->fib_priority = *rta->rta_priority; | |
299 | if (rta->rta_mx) { | |
300 | int attrlen = RTA_PAYLOAD(rta->rta_mx); | |
301 | struct rtattr *attr = RTA_DATA(rta->rta_mx); | |
302 | ||
303 | while(RTA_OK(attr, attrlen)) { | |
304 | unsigned flavour = attr->rta_type; | |
305 | if (flavour) { | |
306 | if (flavour > RTAX_MAX) | |
307 | goto err_inval; | |
308 | fi->fib_metrics[flavour-1] = *(unsigned*)RTA_DATA(attr); | |
309 | } | |
310 | attr = RTA_NEXT(attr, attrlen); | |
311 | } | |
312 | } | |
313 | if (rta->rta_prefsrc) | |
314 | memcpy(&fi->fib_prefsrc, rta->rta_prefsrc, 2); | |
315 | ||
316 | if (rta->rta_mp) { | |
317 | if ((err = dn_fib_get_nhs(fi, rta->rta_mp, r)) != 0) | |
318 | goto failure; | |
319 | if (rta->rta_oif && fi->fib_nh->nh_oif != *rta->rta_oif) | |
320 | goto err_inval; | |
321 | if (rta->rta_gw && memcmp(&fi->fib_nh->nh_gw, rta->rta_gw, 2)) | |
322 | goto err_inval; | |
323 | } else { | |
324 | struct dn_fib_nh *nh = fi->fib_nh; | |
325 | if (rta->rta_oif) | |
326 | nh->nh_oif = *rta->rta_oif; | |
327 | if (rta->rta_gw) | |
328 | memcpy(&nh->nh_gw, rta->rta_gw, 2); | |
329 | nh->nh_flags = r->rtm_flags; | |
330 | nh->nh_weight = 1; | |
331 | } | |
332 | ||
333 | if (r->rtm_type == RTN_NAT) { | |
334 | if (rta->rta_gw == NULL || nhs != 1 || rta->rta_oif) | |
335 | goto err_inval; | |
336 | memcpy(&fi->fib_nh->nh_gw, rta->rta_gw, 2); | |
337 | goto link_it; | |
338 | } | |
339 | ||
340 | if (dn_fib_props[r->rtm_type].error) { | |
341 | if (rta->rta_gw || rta->rta_oif || rta->rta_mp) | |
342 | goto err_inval; | |
343 | goto link_it; | |
344 | } | |
345 | ||
346 | if (r->rtm_scope > RT_SCOPE_HOST) | |
347 | goto err_inval; | |
348 | ||
349 | if (r->rtm_scope == RT_SCOPE_HOST) { | |
350 | struct dn_fib_nh *nh = fi->fib_nh; | |
351 | ||
352 | /* Local address is added */ | |
353 | if (nhs != 1 || nh->nh_gw) | |
354 | goto err_inval; | |
355 | nh->nh_scope = RT_SCOPE_NOWHERE; | |
881d966b | 356 | nh->nh_dev = dev_get_by_index(&init_net, fi->fib_nh->nh_oif); |
1da177e4 LT |
357 | err = -ENODEV; |
358 | if (nh->nh_dev == NULL) | |
359 | goto failure; | |
360 | } else { | |
361 | change_nexthops(fi) { | |
362 | if ((err = dn_fib_check_nh(r, fi, nh)) != 0) | |
363 | goto failure; | |
364 | } endfor_nexthops(fi) | |
365 | } | |
366 | ||
367 | if (fi->fib_prefsrc) { | |
368 | if (r->rtm_type != RTN_LOCAL || rta->rta_dst == NULL || | |
369 | memcmp(&fi->fib_prefsrc, rta->rta_dst, 2)) | |
370 | if (dnet_addr_type(fi->fib_prefsrc) != RTN_LOCAL) | |
371 | goto err_inval; | |
372 | } | |
373 | ||
374 | link_it: | |
375 | if ((ofi = dn_fib_find_info(fi)) != NULL) { | |
376 | fi->fib_dead = 1; | |
377 | dn_fib_free_info(fi); | |
378 | ofi->fib_treeref++; | |
379 | return ofi; | |
380 | } | |
381 | ||
382 | fi->fib_treeref++; | |
383 | atomic_inc(&fi->fib_clntref); | |
a22ec367 | 384 | spin_lock(&dn_fib_info_lock); |
1da177e4 LT |
385 | fi->fib_next = dn_fib_info_list; |
386 | fi->fib_prev = NULL; | |
387 | if (dn_fib_info_list) | |
388 | dn_fib_info_list->fib_prev = fi; | |
389 | dn_fib_info_list = fi; | |
a22ec367 | 390 | spin_unlock(&dn_fib_info_lock); |
1da177e4 LT |
391 | return fi; |
392 | ||
393 | err_inval: | |
394 | err = -EINVAL; | |
395 | ||
396 | failure: | |
397 | *errp = err; | |
398 | if (fi) { | |
399 | fi->fib_dead = 1; | |
400 | dn_fib_free_info(fi); | |
401 | } | |
402 | ||
403 | return NULL; | |
404 | } | |
405 | ||
406 | int dn_fib_semantic_match(int type, struct dn_fib_info *fi, const struct flowi *fl, struct dn_fib_res *res) | |
407 | { | |
408 | int err = dn_fib_props[type].error; | |
409 | ||
410 | if (err == 0) { | |
411 | if (fi->fib_flags & RTNH_F_DEAD) | |
412 | return 1; | |
413 | ||
414 | res->fi = fi; | |
415 | ||
416 | switch(type) { | |
417 | case RTN_NAT: | |
418 | DN_FIB_RES_RESET(*res); | |
419 | atomic_inc(&fi->fib_clntref); | |
420 | return 0; | |
421 | case RTN_UNICAST: | |
422 | case RTN_LOCAL: | |
423 | for_nexthops(fi) { | |
424 | if (nh->nh_flags & RTNH_F_DEAD) | |
425 | continue; | |
426 | if (!fl->oif || fl->oif == nh->nh_oif) | |
427 | break; | |
428 | } | |
429 | if (nhsel < fi->fib_nhs) { | |
430 | res->nh_sel = nhsel; | |
431 | atomic_inc(&fi->fib_clntref); | |
432 | return 0; | |
433 | } | |
434 | endfor_nexthops(fi); | |
435 | res->fi = NULL; | |
436 | return 1; | |
437 | default: | |
438 | if (net_ratelimit()) | |
439 | printk("DECnet: impossible routing event : dn_fib_semantic_match type=%d\n", type); | |
440 | res->fi = NULL; | |
441 | return -EINVAL; | |
442 | } | |
443 | } | |
444 | return err; | |
445 | } | |
446 | ||
447 | void dn_fib_select_multipath(const struct flowi *fl, struct dn_fib_res *res) | |
448 | { | |
449 | struct dn_fib_info *fi = res->fi; | |
450 | int w; | |
451 | ||
452 | spin_lock_bh(&dn_fib_multipath_lock); | |
453 | if (fi->fib_power <= 0) { | |
454 | int power = 0; | |
455 | change_nexthops(fi) { | |
456 | if (!(nh->nh_flags&RTNH_F_DEAD)) { | |
457 | power += nh->nh_weight; | |
458 | nh->nh_power = nh->nh_weight; | |
459 | } | |
460 | } endfor_nexthops(fi); | |
461 | fi->fib_power = power; | |
462 | if (power < 0) { | |
463 | spin_unlock_bh(&dn_fib_multipath_lock); | |
464 | res->nh_sel = 0; | |
465 | return; | |
466 | } | |
467 | } | |
468 | ||
469 | w = jiffies % fi->fib_power; | |
470 | ||
471 | change_nexthops(fi) { | |
472 | if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) { | |
473 | if ((w -= nh->nh_power) <= 0) { | |
474 | nh->nh_power--; | |
475 | fi->fib_power--; | |
476 | res->nh_sel = nhsel; | |
477 | spin_unlock_bh(&dn_fib_multipath_lock); | |
478 | return; | |
479 | } | |
480 | } | |
481 | } endfor_nexthops(fi); | |
482 | res->nh_sel = 0; | |
483 | spin_unlock_bh(&dn_fib_multipath_lock); | |
484 | } | |
485 | ||
486 | ||
487 | static int dn_fib_check_attr(struct rtmsg *r, struct rtattr **rta) | |
488 | { | |
489 | int i; | |
490 | ||
491 | for(i = 1; i <= RTA_MAX; i++) { | |
492 | struct rtattr *attr = rta[i-1]; | |
493 | if (attr) { | |
494 | if (RTA_PAYLOAD(attr) < 4 && RTA_PAYLOAD(attr) != 2) | |
495 | return -EINVAL; | |
9e762a4a PM |
496 | if (i != RTA_MULTIPATH && i != RTA_METRICS && |
497 | i != RTA_TABLE) | |
1da177e4 LT |
498 | rta[i-1] = (struct rtattr *)RTA_DATA(attr); |
499 | } | |
500 | } | |
501 | ||
502 | return 0; | |
503 | } | |
504 | ||
fa34ddd7 | 505 | static int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 506 | { |
3b1e0a65 | 507 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
508 | struct dn_fib_table *tb; |
509 | struct rtattr **rta = arg; | |
510 | struct rtmsg *r = NLMSG_DATA(nlh); | |
511 | ||
09ad9bc7 | 512 | if (!net_eq(net, &init_net)) |
b854272b DL |
513 | return -EINVAL; |
514 | ||
1da177e4 LT |
515 | if (dn_fib_check_attr(r, rta)) |
516 | return -EINVAL; | |
517 | ||
9e762a4a | 518 | tb = dn_fib_get_table(rtm_get_table(rta, r->rtm_table), 0); |
1da177e4 LT |
519 | if (tb) |
520 | return tb->delete(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb)); | |
521 | ||
522 | return -ESRCH; | |
523 | } | |
524 | ||
fa34ddd7 | 525 | static int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 526 | { |
3b1e0a65 | 527 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
528 | struct dn_fib_table *tb; |
529 | struct rtattr **rta = arg; | |
530 | struct rtmsg *r = NLMSG_DATA(nlh); | |
531 | ||
09ad9bc7 | 532 | if (!net_eq(net, &init_net)) |
b854272b DL |
533 | return -EINVAL; |
534 | ||
1da177e4 LT |
535 | if (dn_fib_check_attr(r, rta)) |
536 | return -EINVAL; | |
537 | ||
9e762a4a | 538 | tb = dn_fib_get_table(rtm_get_table(rta, r->rtm_table), 1); |
429eb0fa | 539 | if (tb) |
1da177e4 LT |
540 | return tb->insert(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb)); |
541 | ||
542 | return -ENOBUFS; | |
543 | } | |
544 | ||
c4ea94ab | 545 | static void fib_magic(int cmd, int type, __le16 dst, int dst_len, struct dn_ifaddr *ifa) |
1da177e4 LT |
546 | { |
547 | struct dn_fib_table *tb; | |
548 | struct { | |
549 | struct nlmsghdr nlh; | |
550 | struct rtmsg rtm; | |
551 | } req; | |
552 | struct dn_kern_rta rta; | |
553 | ||
554 | memset(&req.rtm, 0, sizeof(req.rtm)); | |
555 | memset(&rta, 0, sizeof(rta)); | |
556 | ||
557 | if (type == RTN_UNICAST) | |
558 | tb = dn_fib_get_table(RT_MIN_TABLE, 1); | |
559 | else | |
560 | tb = dn_fib_get_table(RT_TABLE_LOCAL, 1); | |
561 | ||
562 | if (tb == NULL) | |
563 | return; | |
564 | ||
565 | req.nlh.nlmsg_len = sizeof(req); | |
566 | req.nlh.nlmsg_type = cmd; | |
567 | req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND; | |
568 | req.nlh.nlmsg_pid = 0; | |
569 | req.nlh.nlmsg_seq = 0; | |
570 | ||
571 | req.rtm.rtm_dst_len = dst_len; | |
572 | req.rtm.rtm_table = tb->n; | |
573 | req.rtm.rtm_protocol = RTPROT_KERNEL; | |
574 | req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST); | |
575 | req.rtm.rtm_type = type; | |
576 | ||
577 | rta.rta_dst = &dst; | |
578 | rta.rta_prefsrc = &ifa->ifa_local; | |
579 | rta.rta_oif = &ifa->ifa_dev->dev->ifindex; | |
580 | ||
581 | if (cmd == RTM_NEWROUTE) | |
582 | tb->insert(tb, &req.rtm, &rta, &req.nlh, NULL); | |
583 | else | |
584 | tb->delete(tb, &req.rtm, &rta, &req.nlh, NULL); | |
585 | } | |
586 | ||
587 | static void dn_fib_add_ifaddr(struct dn_ifaddr *ifa) | |
588 | { | |
589 | ||
590 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa); | |
591 | ||
592 | #if 0 | |
593 | if (!(dev->flags&IFF_UP)) | |
594 | return; | |
595 | /* In the future, we will want to add default routes here */ | |
596 | ||
597 | #endif | |
598 | } | |
599 | ||
600 | static void dn_fib_del_ifaddr(struct dn_ifaddr *ifa) | |
601 | { | |
602 | int found_it = 0; | |
603 | struct net_device *dev; | |
604 | struct dn_dev *dn_db; | |
605 | struct dn_ifaddr *ifa2; | |
606 | ||
607 | ASSERT_RTNL(); | |
608 | ||
609 | /* Scan device list */ | |
c6d14c84 ED |
610 | rcu_read_lock(); |
611 | for_each_netdev_rcu(&init_net, dev) { | |
1da177e4 LT |
612 | dn_db = dev->dn_ptr; |
613 | if (dn_db == NULL) | |
614 | continue; | |
615 | for(ifa2 = dn_db->ifa_list; ifa2; ifa2 = ifa2->ifa_next) { | |
616 | if (ifa2->ifa_local == ifa->ifa_local) { | |
617 | found_it = 1; | |
618 | break; | |
619 | } | |
620 | } | |
621 | } | |
c6d14c84 | 622 | rcu_read_unlock(); |
1da177e4 LT |
623 | |
624 | if (found_it == 0) { | |
625 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa); | |
626 | ||
627 | if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) { | |
628 | if (dn_fib_sync_down(ifa->ifa_local, NULL, 0)) | |
629 | dn_fib_flush(); | |
630 | } | |
631 | } | |
632 | } | |
633 | ||
634 | static void dn_fib_disable_addr(struct net_device *dev, int force) | |
635 | { | |
636 | if (dn_fib_sync_down(0, dev, force)) | |
637 | dn_fib_flush(); | |
638 | dn_rt_cache_flush(0); | |
639 | neigh_ifdown(&dn_neigh_table, dev); | |
640 | } | |
641 | ||
642 | static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
643 | { | |
644 | struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr; | |
645 | ||
646 | switch(event) { | |
647 | case NETDEV_UP: | |
648 | dn_fib_add_ifaddr(ifa); | |
649 | dn_fib_sync_up(ifa->ifa_dev->dev); | |
650 | dn_rt_cache_flush(-1); | |
651 | break; | |
652 | case NETDEV_DOWN: | |
653 | dn_fib_del_ifaddr(ifa); | |
654 | if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) { | |
655 | dn_fib_disable_addr(ifa->ifa_dev->dev, 1); | |
656 | } else { | |
657 | dn_rt_cache_flush(-1); | |
658 | } | |
659 | break; | |
660 | } | |
661 | return NOTIFY_DONE; | |
662 | } | |
663 | ||
2aa7f36c | 664 | static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force) |
1da177e4 | 665 | { |
429eb0fa YH |
666 | int ret = 0; |
667 | int scope = RT_SCOPE_NOWHERE; | |
668 | ||
669 | if (force) | |
670 | scope = -1; | |
671 | ||
672 | for_fib_info() { | |
673 | /* | |
674 | * This makes no sense for DECnet.... we will almost | |
675 | * certainly have more than one local address the same | |
676 | * over all our interfaces. It needs thinking about | |
677 | * some more. | |
678 | */ | |
679 | if (local && fi->fib_prefsrc == local) { | |
680 | fi->fib_flags |= RTNH_F_DEAD; | |
681 | ret++; | |
682 | } else if (dev && fi->fib_nhs) { | |
683 | int dead = 0; | |
684 | ||
685 | change_nexthops(fi) { | |
686 | if (nh->nh_flags&RTNH_F_DEAD) | |
687 | dead++; | |
688 | else if (nh->nh_dev == dev && | |
689 | nh->nh_scope != scope) { | |
1da177e4 | 690 | spin_lock_bh(&dn_fib_multipath_lock); |
429eb0fa YH |
691 | nh->nh_flags |= RTNH_F_DEAD; |
692 | fi->fib_power -= nh->nh_power; | |
693 | nh->nh_power = 0; | |
1da177e4 | 694 | spin_unlock_bh(&dn_fib_multipath_lock); |
429eb0fa YH |
695 | dead++; |
696 | } | |
697 | } endfor_nexthops(fi) | |
698 | if (dead == fi->fib_nhs) { | |
699 | fi->fib_flags |= RTNH_F_DEAD; | |
700 | ret++; | |
701 | } | |
702 | } | |
703 | } endfor_fib_info(); | |
704 | return ret; | |
1da177e4 LT |
705 | } |
706 | ||
707 | ||
2aa7f36c | 708 | static int dn_fib_sync_up(struct net_device *dev) |
1da177e4 | 709 | { |
429eb0fa YH |
710 | int ret = 0; |
711 | ||
712 | if (!(dev->flags&IFF_UP)) | |
713 | return 0; | |
714 | ||
715 | for_fib_info() { | |
716 | int alive = 0; | |
717 | ||
718 | change_nexthops(fi) { | |
719 | if (!(nh->nh_flags&RTNH_F_DEAD)) { | |
720 | alive++; | |
721 | continue; | |
722 | } | |
723 | if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP)) | |
724 | continue; | |
725 | if (nh->nh_dev != dev || dev->dn_ptr == NULL) | |
726 | continue; | |
727 | alive++; | |
1da177e4 | 728 | spin_lock_bh(&dn_fib_multipath_lock); |
429eb0fa YH |
729 | nh->nh_power = 0; |
730 | nh->nh_flags &= ~RTNH_F_DEAD; | |
1da177e4 | 731 | spin_unlock_bh(&dn_fib_multipath_lock); |
429eb0fa YH |
732 | } endfor_nexthops(fi); |
733 | ||
734 | if (alive > 0) { | |
735 | fi->fib_flags &= ~RTNH_F_DEAD; | |
736 | ret++; | |
737 | } | |
738 | } endfor_fib_info(); | |
739 | return ret; | |
1da177e4 LT |
740 | } |
741 | ||
1da177e4 LT |
742 | static struct notifier_block dn_fib_dnaddr_notifier = { |
743 | .notifier_call = dn_fib_dnaddr_event, | |
744 | }; | |
745 | ||
746 | void __exit dn_fib_cleanup(void) | |
747 | { | |
748 | dn_fib_table_cleanup(); | |
749 | dn_fib_rules_cleanup(); | |
750 | ||
751 | unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier); | |
752 | } | |
753 | ||
754 | ||
755 | void __init dn_fib_init(void) | |
756 | { | |
1da177e4 LT |
757 | dn_fib_table_init(); |
758 | dn_fib_rules_init(); | |
759 | ||
760 | register_dnaddr_notifier(&dn_fib_dnaddr_notifier); | |
fa34ddd7 TG |
761 | |
762 | rtnl_register(PF_DECnet, RTM_NEWROUTE, dn_fib_rtm_newroute, NULL); | |
763 | rtnl_register(PF_DECnet, RTM_DELROUTE, dn_fib_rtm_delroute, NULL); | |
1da177e4 LT |
764 | } |
765 | ||
766 |