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> | |
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> | |
33 | #include <asm/atomic.h> | |
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 | ||
c4ea94ab | 148 | __le16 dn_fib_get_attr16(struct rtattr *attr, int attrlen, int type) |
1da177e4 LT |
149 | { |
150 | while(RTA_OK(attr,attrlen)) { | |
151 | if (attr->rta_type == type) | |
c4ea94ab | 152 | return *(__le16*)RTA_DATA(attr); |
1da177e4 LT |
153 | attr = RTA_NEXT(attr, attrlen); |
154 | } | |
155 | ||
156 | return 0; | |
157 | } | |
158 | ||
159 | static int dn_fib_count_nhs(struct rtattr *rta) | |
160 | { | |
161 | int nhs = 0; | |
162 | struct rtnexthop *nhp = RTA_DATA(rta); | |
163 | int nhlen = RTA_PAYLOAD(rta); | |
164 | ||
165 | while(nhlen >= (int)sizeof(struct rtnexthop)) { | |
166 | if ((nhlen -= nhp->rtnh_len) < 0) | |
167 | return 0; | |
168 | nhs++; | |
169 | nhp = RTNH_NEXT(nhp); | |
170 | } | |
171 | ||
172 | return nhs; | |
173 | } | |
174 | ||
175 | static int dn_fib_get_nhs(struct dn_fib_info *fi, const struct rtattr *rta, const struct rtmsg *r) | |
176 | { | |
177 | struct rtnexthop *nhp = RTA_DATA(rta); | |
178 | int nhlen = RTA_PAYLOAD(rta); | |
179 | ||
180 | change_nexthops(fi) { | |
181 | int attrlen = nhlen - sizeof(struct rtnexthop); | |
182 | if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0) | |
183 | return -EINVAL; | |
184 | ||
185 | nh->nh_flags = (r->rtm_flags&~0xFF) | nhp->rtnh_flags; | |
186 | nh->nh_oif = nhp->rtnh_ifindex; | |
187 | nh->nh_weight = nhp->rtnh_hops + 1; | |
188 | ||
189 | if (attrlen) { | |
190 | nh->nh_gw = dn_fib_get_attr16(RTNH_DATA(nhp), attrlen, RTA_GATEWAY); | |
191 | } | |
192 | nhp = RTNH_NEXT(nhp); | |
193 | } endfor_nexthops(fi); | |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
198 | ||
199 | static int dn_fib_check_nh(const struct rtmsg *r, struct dn_fib_info *fi, struct dn_fib_nh *nh) | |
200 | { | |
201 | int err; | |
202 | ||
203 | if (nh->nh_gw) { | |
204 | struct flowi fl; | |
205 | struct dn_fib_res res; | |
206 | ||
1da177e4 LT |
207 | if (nh->nh_flags&RTNH_F_ONLINK) { |
208 | struct net_device *dev; | |
209 | ||
210 | if (r->rtm_scope >= RT_SCOPE_LINK) | |
211 | return -EINVAL; | |
212 | if (dnet_addr_type(nh->nh_gw) != RTN_UNICAST) | |
213 | return -EINVAL; | |
881d966b | 214 | if ((dev = __dev_get_by_index(&init_net, nh->nh_oif)) == NULL) |
1da177e4 LT |
215 | return -ENODEV; |
216 | if (!(dev->flags&IFF_UP)) | |
217 | return -ENETDOWN; | |
218 | nh->nh_dev = dev; | |
219 | dev_hold(dev); | |
220 | nh->nh_scope = RT_SCOPE_LINK; | |
221 | return 0; | |
222 | } | |
223 | ||
224 | memset(&fl, 0, sizeof(fl)); | |
225 | fl.fld_dst = nh->nh_gw; | |
1d28f42c | 226 | fl.flowi_oif = nh->nh_oif; |
1da177e4 LT |
227 | fl.fld_scope = r->rtm_scope + 1; |
228 | ||
229 | if (fl.fld_scope < RT_SCOPE_LINK) | |
230 | fl.fld_scope = RT_SCOPE_LINK; | |
231 | ||
232 | if ((err = dn_fib_lookup(&fl, &res)) != 0) | |
233 | return err; | |
234 | ||
235 | err = -EINVAL; | |
236 | if (res.type != RTN_UNICAST && res.type != RTN_LOCAL) | |
237 | goto out; | |
238 | nh->nh_scope = res.scope; | |
239 | nh->nh_oif = DN_FIB_RES_OIF(res); | |
240 | nh->nh_dev = DN_FIB_RES_DEV(res); | |
241 | if (nh->nh_dev == NULL) | |
242 | goto out; | |
243 | dev_hold(nh->nh_dev); | |
244 | err = -ENETDOWN; | |
245 | if (!(nh->nh_dev->flags & IFF_UP)) | |
246 | goto out; | |
247 | err = 0; | |
248 | out: | |
249 | dn_fib_res_put(&res); | |
250 | return err; | |
251 | } else { | |
252 | struct net_device *dev; | |
253 | ||
254 | if (nh->nh_flags&(RTNH_F_PERVASIVE|RTNH_F_ONLINK)) | |
255 | return -EINVAL; | |
256 | ||
881d966b | 257 | dev = __dev_get_by_index(&init_net, nh->nh_oif); |
1da177e4 LT |
258 | if (dev == NULL || dev->dn_ptr == NULL) |
259 | return -ENODEV; | |
260 | if (!(dev->flags&IFF_UP)) | |
261 | return -ENETDOWN; | |
262 | nh->nh_dev = dev; | |
263 | dev_hold(nh->nh_dev); | |
264 | nh->nh_scope = RT_SCOPE_HOST; | |
265 | } | |
266 | ||
267 | return 0; | |
268 | } | |
269 | ||
270 | ||
271 | struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r, struct dn_kern_rta *rta, const struct nlmsghdr *nlh, int *errp) | |
272 | { | |
273 | int err; | |
274 | struct dn_fib_info *fi = NULL; | |
275 | struct dn_fib_info *ofi; | |
276 | int nhs = 1; | |
277 | ||
a9791011 TG |
278 | if (r->rtm_type > RTN_MAX) |
279 | goto err_inval; | |
280 | ||
1da177e4 LT |
281 | if (dn_fib_props[r->rtm_type].scope > r->rtm_scope) |
282 | goto err_inval; | |
283 | ||
284 | if (rta->rta_mp) { | |
285 | nhs = dn_fib_count_nhs(rta->rta_mp); | |
286 | if (nhs == 0) | |
287 | goto err_inval; | |
288 | } | |
289 | ||
0da974f4 | 290 | fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct dn_fib_nh), GFP_KERNEL); |
1da177e4 LT |
291 | err = -ENOBUFS; |
292 | if (fi == NULL) | |
293 | goto failure; | |
1da177e4 LT |
294 | |
295 | fi->fib_protocol = r->rtm_protocol; | |
296 | fi->fib_nhs = nhs; | |
297 | fi->fib_flags = r->rtm_flags; | |
298 | if (rta->rta_priority) | |
299 | fi->fib_priority = *rta->rta_priority; | |
300 | if (rta->rta_mx) { | |
301 | int attrlen = RTA_PAYLOAD(rta->rta_mx); | |
302 | struct rtattr *attr = RTA_DATA(rta->rta_mx); | |
303 | ||
304 | while(RTA_OK(attr, attrlen)) { | |
305 | unsigned flavour = attr->rta_type; | |
306 | if (flavour) { | |
307 | if (flavour > RTAX_MAX) | |
308 | goto err_inval; | |
309 | fi->fib_metrics[flavour-1] = *(unsigned*)RTA_DATA(attr); | |
310 | } | |
311 | attr = RTA_NEXT(attr, attrlen); | |
312 | } | |
313 | } | |
314 | if (rta->rta_prefsrc) | |
315 | memcpy(&fi->fib_prefsrc, rta->rta_prefsrc, 2); | |
316 | ||
317 | if (rta->rta_mp) { | |
318 | if ((err = dn_fib_get_nhs(fi, rta->rta_mp, r)) != 0) | |
319 | goto failure; | |
320 | if (rta->rta_oif && fi->fib_nh->nh_oif != *rta->rta_oif) | |
321 | goto err_inval; | |
322 | if (rta->rta_gw && memcmp(&fi->fib_nh->nh_gw, rta->rta_gw, 2)) | |
323 | goto err_inval; | |
324 | } else { | |
325 | struct dn_fib_nh *nh = fi->fib_nh; | |
326 | if (rta->rta_oif) | |
327 | nh->nh_oif = *rta->rta_oif; | |
328 | if (rta->rta_gw) | |
329 | memcpy(&nh->nh_gw, rta->rta_gw, 2); | |
330 | nh->nh_flags = r->rtm_flags; | |
331 | nh->nh_weight = 1; | |
332 | } | |
333 | ||
334 | if (r->rtm_type == RTN_NAT) { | |
335 | if (rta->rta_gw == NULL || nhs != 1 || rta->rta_oif) | |
336 | goto err_inval; | |
337 | memcpy(&fi->fib_nh->nh_gw, rta->rta_gw, 2); | |
338 | goto link_it; | |
339 | } | |
340 | ||
341 | if (dn_fib_props[r->rtm_type].error) { | |
342 | if (rta->rta_gw || rta->rta_oif || rta->rta_mp) | |
343 | goto err_inval; | |
344 | goto link_it; | |
345 | } | |
346 | ||
347 | if (r->rtm_scope > RT_SCOPE_HOST) | |
348 | goto err_inval; | |
349 | ||
350 | if (r->rtm_scope == RT_SCOPE_HOST) { | |
351 | struct dn_fib_nh *nh = fi->fib_nh; | |
352 | ||
353 | /* Local address is added */ | |
354 | if (nhs != 1 || nh->nh_gw) | |
355 | goto err_inval; | |
356 | nh->nh_scope = RT_SCOPE_NOWHERE; | |
881d966b | 357 | nh->nh_dev = dev_get_by_index(&init_net, fi->fib_nh->nh_oif); |
1da177e4 LT |
358 | err = -ENODEV; |
359 | if (nh->nh_dev == NULL) | |
360 | goto failure; | |
361 | } else { | |
362 | change_nexthops(fi) { | |
363 | if ((err = dn_fib_check_nh(r, fi, nh)) != 0) | |
364 | goto failure; | |
365 | } endfor_nexthops(fi) | |
366 | } | |
367 | ||
368 | if (fi->fib_prefsrc) { | |
369 | if (r->rtm_type != RTN_LOCAL || rta->rta_dst == NULL || | |
370 | memcmp(&fi->fib_prefsrc, rta->rta_dst, 2)) | |
371 | if (dnet_addr_type(fi->fib_prefsrc) != RTN_LOCAL) | |
372 | goto err_inval; | |
373 | } | |
374 | ||
375 | link_it: | |
376 | if ((ofi = dn_fib_find_info(fi)) != NULL) { | |
377 | fi->fib_dead = 1; | |
378 | dn_fib_free_info(fi); | |
379 | ofi->fib_treeref++; | |
380 | return ofi; | |
381 | } | |
382 | ||
383 | fi->fib_treeref++; | |
384 | atomic_inc(&fi->fib_clntref); | |
a22ec367 | 385 | spin_lock(&dn_fib_info_lock); |
1da177e4 LT |
386 | fi->fib_next = dn_fib_info_list; |
387 | fi->fib_prev = NULL; | |
388 | if (dn_fib_info_list) | |
389 | dn_fib_info_list->fib_prev = fi; | |
390 | dn_fib_info_list = fi; | |
a22ec367 | 391 | spin_unlock(&dn_fib_info_lock); |
1da177e4 LT |
392 | return fi; |
393 | ||
394 | err_inval: | |
395 | err = -EINVAL; | |
396 | ||
397 | failure: | |
398 | *errp = err; | |
399 | if (fi) { | |
400 | fi->fib_dead = 1; | |
401 | dn_fib_free_info(fi); | |
402 | } | |
403 | ||
404 | return NULL; | |
405 | } | |
406 | ||
407 | int dn_fib_semantic_match(int type, struct dn_fib_info *fi, const struct flowi *fl, struct dn_fib_res *res) | |
408 | { | |
409 | int err = dn_fib_props[type].error; | |
410 | ||
411 | if (err == 0) { | |
412 | if (fi->fib_flags & RTNH_F_DEAD) | |
413 | return 1; | |
414 | ||
415 | res->fi = fi; | |
416 | ||
417 | switch(type) { | |
418 | case RTN_NAT: | |
419 | DN_FIB_RES_RESET(*res); | |
420 | atomic_inc(&fi->fib_clntref); | |
421 | return 0; | |
422 | case RTN_UNICAST: | |
423 | case RTN_LOCAL: | |
424 | for_nexthops(fi) { | |
425 | if (nh->nh_flags & RTNH_F_DEAD) | |
426 | continue; | |
1d28f42c | 427 | if (!fl->flowi_oif || fl->flowi_oif == nh->nh_oif) |
1da177e4 LT |
428 | break; |
429 | } | |
430 | if (nhsel < fi->fib_nhs) { | |
431 | res->nh_sel = nhsel; | |
432 | atomic_inc(&fi->fib_clntref); | |
433 | return 0; | |
434 | } | |
435 | endfor_nexthops(fi); | |
436 | res->fi = NULL; | |
437 | return 1; | |
438 | default: | |
439 | if (net_ratelimit()) | |
440 | printk("DECnet: impossible routing event : dn_fib_semantic_match type=%d\n", type); | |
441 | res->fi = NULL; | |
442 | return -EINVAL; | |
443 | } | |
444 | } | |
445 | return err; | |
446 | } | |
447 | ||
448 | void dn_fib_select_multipath(const struct flowi *fl, struct dn_fib_res *res) | |
449 | { | |
450 | struct dn_fib_info *fi = res->fi; | |
451 | int w; | |
452 | ||
453 | spin_lock_bh(&dn_fib_multipath_lock); | |
454 | if (fi->fib_power <= 0) { | |
455 | int power = 0; | |
456 | change_nexthops(fi) { | |
457 | if (!(nh->nh_flags&RTNH_F_DEAD)) { | |
458 | power += nh->nh_weight; | |
459 | nh->nh_power = nh->nh_weight; | |
460 | } | |
461 | } endfor_nexthops(fi); | |
462 | fi->fib_power = power; | |
463 | if (power < 0) { | |
464 | spin_unlock_bh(&dn_fib_multipath_lock); | |
465 | res->nh_sel = 0; | |
466 | return; | |
467 | } | |
468 | } | |
469 | ||
470 | w = jiffies % fi->fib_power; | |
471 | ||
472 | change_nexthops(fi) { | |
473 | if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) { | |
474 | if ((w -= nh->nh_power) <= 0) { | |
475 | nh->nh_power--; | |
476 | fi->fib_power--; | |
477 | res->nh_sel = nhsel; | |
478 | spin_unlock_bh(&dn_fib_multipath_lock); | |
479 | return; | |
480 | } | |
481 | } | |
482 | } endfor_nexthops(fi); | |
483 | res->nh_sel = 0; | |
484 | spin_unlock_bh(&dn_fib_multipath_lock); | |
485 | } | |
486 | ||
487 | ||
488 | static int dn_fib_check_attr(struct rtmsg *r, struct rtattr **rta) | |
489 | { | |
490 | int i; | |
491 | ||
492 | for(i = 1; i <= RTA_MAX; i++) { | |
493 | struct rtattr *attr = rta[i-1]; | |
494 | if (attr) { | |
495 | if (RTA_PAYLOAD(attr) < 4 && RTA_PAYLOAD(attr) != 2) | |
496 | return -EINVAL; | |
9e762a4a PM |
497 | if (i != RTA_MULTIPATH && i != RTA_METRICS && |
498 | i != RTA_TABLE) | |
1da177e4 LT |
499 | rta[i-1] = (struct rtattr *)RTA_DATA(attr); |
500 | } | |
501 | } | |
502 | ||
503 | return 0; | |
504 | } | |
505 | ||
fa34ddd7 | 506 | static int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 507 | { |
3b1e0a65 | 508 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
509 | struct dn_fib_table *tb; |
510 | struct rtattr **rta = arg; | |
511 | struct rtmsg *r = NLMSG_DATA(nlh); | |
512 | ||
09ad9bc7 | 513 | if (!net_eq(net, &init_net)) |
b854272b DL |
514 | return -EINVAL; |
515 | ||
1da177e4 LT |
516 | if (dn_fib_check_attr(r, rta)) |
517 | return -EINVAL; | |
518 | ||
9e762a4a | 519 | tb = dn_fib_get_table(rtm_get_table(rta, r->rtm_table), 0); |
1da177e4 LT |
520 | if (tb) |
521 | return tb->delete(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb)); | |
522 | ||
523 | return -ESRCH; | |
524 | } | |
525 | ||
fa34ddd7 | 526 | static int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
1da177e4 | 527 | { |
3b1e0a65 | 528 | struct net *net = sock_net(skb->sk); |
1da177e4 LT |
529 | struct dn_fib_table *tb; |
530 | struct rtattr **rta = arg; | |
531 | struct rtmsg *r = NLMSG_DATA(nlh); | |
532 | ||
09ad9bc7 | 533 | if (!net_eq(net, &init_net)) |
b854272b DL |
534 | return -EINVAL; |
535 | ||
1da177e4 LT |
536 | if (dn_fib_check_attr(r, rta)) |
537 | return -EINVAL; | |
538 | ||
9e762a4a | 539 | tb = dn_fib_get_table(rtm_get_table(rta, r->rtm_table), 1); |
429eb0fa | 540 | if (tb) |
1da177e4 LT |
541 | return tb->insert(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb)); |
542 | ||
543 | return -ENOBUFS; | |
544 | } | |
545 | ||
c4ea94ab | 546 | static void fib_magic(int cmd, int type, __le16 dst, int dst_len, struct dn_ifaddr *ifa) |
1da177e4 LT |
547 | { |
548 | struct dn_fib_table *tb; | |
549 | struct { | |
550 | struct nlmsghdr nlh; | |
551 | struct rtmsg rtm; | |
552 | } req; | |
553 | struct dn_kern_rta rta; | |
554 | ||
555 | memset(&req.rtm, 0, sizeof(req.rtm)); | |
556 | memset(&rta, 0, sizeof(rta)); | |
557 | ||
558 | if (type == RTN_UNICAST) | |
559 | tb = dn_fib_get_table(RT_MIN_TABLE, 1); | |
560 | else | |
561 | tb = dn_fib_get_table(RT_TABLE_LOCAL, 1); | |
562 | ||
563 | if (tb == NULL) | |
564 | return; | |
565 | ||
566 | req.nlh.nlmsg_len = sizeof(req); | |
567 | req.nlh.nlmsg_type = cmd; | |
568 | req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND; | |
569 | req.nlh.nlmsg_pid = 0; | |
570 | req.nlh.nlmsg_seq = 0; | |
571 | ||
572 | req.rtm.rtm_dst_len = dst_len; | |
573 | req.rtm.rtm_table = tb->n; | |
574 | req.rtm.rtm_protocol = RTPROT_KERNEL; | |
575 | req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST); | |
576 | req.rtm.rtm_type = type; | |
577 | ||
578 | rta.rta_dst = &dst; | |
579 | rta.rta_prefsrc = &ifa->ifa_local; | |
580 | rta.rta_oif = &ifa->ifa_dev->dev->ifindex; | |
581 | ||
582 | if (cmd == RTM_NEWROUTE) | |
583 | tb->insert(tb, &req.rtm, &rta, &req.nlh, NULL); | |
584 | else | |
585 | tb->delete(tb, &req.rtm, &rta, &req.nlh, NULL); | |
586 | } | |
587 | ||
588 | static void dn_fib_add_ifaddr(struct dn_ifaddr *ifa) | |
589 | { | |
590 | ||
591 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa); | |
592 | ||
593 | #if 0 | |
594 | if (!(dev->flags&IFF_UP)) | |
595 | return; | |
596 | /* In the future, we will want to add default routes here */ | |
597 | ||
598 | #endif | |
599 | } | |
600 | ||
601 | static void dn_fib_del_ifaddr(struct dn_ifaddr *ifa) | |
602 | { | |
603 | int found_it = 0; | |
604 | struct net_device *dev; | |
605 | struct dn_dev *dn_db; | |
606 | struct dn_ifaddr *ifa2; | |
607 | ||
608 | ASSERT_RTNL(); | |
609 | ||
610 | /* Scan device list */ | |
c6d14c84 ED |
611 | rcu_read_lock(); |
612 | for_each_netdev_rcu(&init_net, dev) { | |
fc766e4c | 613 | dn_db = rcu_dereference(dev->dn_ptr); |
1da177e4 LT |
614 | if (dn_db == NULL) |
615 | continue; | |
fc766e4c ED |
616 | for (ifa2 = rcu_dereference(dn_db->ifa_list); |
617 | ifa2 != NULL; | |
618 | ifa2 = rcu_dereference(ifa2->ifa_next)) { | |
1da177e4 LT |
619 | if (ifa2->ifa_local == ifa->ifa_local) { |
620 | found_it = 1; | |
621 | break; | |
622 | } | |
623 | } | |
624 | } | |
c6d14c84 | 625 | rcu_read_unlock(); |
1da177e4 LT |
626 | |
627 | if (found_it == 0) { | |
628 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa); | |
629 | ||
630 | if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) { | |
631 | if (dn_fib_sync_down(ifa->ifa_local, NULL, 0)) | |
632 | dn_fib_flush(); | |
633 | } | |
634 | } | |
635 | } | |
636 | ||
637 | static void dn_fib_disable_addr(struct net_device *dev, int force) | |
638 | { | |
639 | if (dn_fib_sync_down(0, dev, force)) | |
640 | dn_fib_flush(); | |
641 | dn_rt_cache_flush(0); | |
642 | neigh_ifdown(&dn_neigh_table, dev); | |
643 | } | |
644 | ||
645 | static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
646 | { | |
647 | struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr; | |
648 | ||
649 | switch(event) { | |
650 | case NETDEV_UP: | |
651 | dn_fib_add_ifaddr(ifa); | |
652 | dn_fib_sync_up(ifa->ifa_dev->dev); | |
653 | dn_rt_cache_flush(-1); | |
654 | break; | |
655 | case NETDEV_DOWN: | |
656 | dn_fib_del_ifaddr(ifa); | |
657 | if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) { | |
658 | dn_fib_disable_addr(ifa->ifa_dev->dev, 1); | |
659 | } else { | |
660 | dn_rt_cache_flush(-1); | |
661 | } | |
662 | break; | |
663 | } | |
664 | return NOTIFY_DONE; | |
665 | } | |
666 | ||
2aa7f36c | 667 | static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force) |
1da177e4 | 668 | { |
429eb0fa YH |
669 | int ret = 0; |
670 | int scope = RT_SCOPE_NOWHERE; | |
671 | ||
672 | if (force) | |
673 | scope = -1; | |
674 | ||
675 | for_fib_info() { | |
676 | /* | |
677 | * This makes no sense for DECnet.... we will almost | |
678 | * certainly have more than one local address the same | |
679 | * over all our interfaces. It needs thinking about | |
680 | * some more. | |
681 | */ | |
682 | if (local && fi->fib_prefsrc == local) { | |
683 | fi->fib_flags |= RTNH_F_DEAD; | |
684 | ret++; | |
685 | } else if (dev && fi->fib_nhs) { | |
686 | int dead = 0; | |
687 | ||
688 | change_nexthops(fi) { | |
689 | if (nh->nh_flags&RTNH_F_DEAD) | |
690 | dead++; | |
691 | else if (nh->nh_dev == dev && | |
692 | nh->nh_scope != scope) { | |
1da177e4 | 693 | spin_lock_bh(&dn_fib_multipath_lock); |
429eb0fa YH |
694 | nh->nh_flags |= RTNH_F_DEAD; |
695 | fi->fib_power -= nh->nh_power; | |
696 | nh->nh_power = 0; | |
1da177e4 | 697 | spin_unlock_bh(&dn_fib_multipath_lock); |
429eb0fa YH |
698 | dead++; |
699 | } | |
700 | } endfor_nexthops(fi) | |
701 | if (dead == fi->fib_nhs) { | |
702 | fi->fib_flags |= RTNH_F_DEAD; | |
703 | ret++; | |
704 | } | |
705 | } | |
706 | } endfor_fib_info(); | |
707 | return ret; | |
1da177e4 LT |
708 | } |
709 | ||
710 | ||
2aa7f36c | 711 | static int dn_fib_sync_up(struct net_device *dev) |
1da177e4 | 712 | { |
429eb0fa YH |
713 | int ret = 0; |
714 | ||
715 | if (!(dev->flags&IFF_UP)) | |
716 | return 0; | |
717 | ||
718 | for_fib_info() { | |
719 | int alive = 0; | |
720 | ||
721 | change_nexthops(fi) { | |
722 | if (!(nh->nh_flags&RTNH_F_DEAD)) { | |
723 | alive++; | |
724 | continue; | |
725 | } | |
726 | if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP)) | |
727 | continue; | |
728 | if (nh->nh_dev != dev || dev->dn_ptr == NULL) | |
729 | continue; | |
730 | alive++; | |
1da177e4 | 731 | spin_lock_bh(&dn_fib_multipath_lock); |
429eb0fa YH |
732 | nh->nh_power = 0; |
733 | nh->nh_flags &= ~RTNH_F_DEAD; | |
1da177e4 | 734 | spin_unlock_bh(&dn_fib_multipath_lock); |
429eb0fa YH |
735 | } endfor_nexthops(fi); |
736 | ||
737 | if (alive > 0) { | |
738 | fi->fib_flags &= ~RTNH_F_DEAD; | |
739 | ret++; | |
740 | } | |
741 | } endfor_fib_info(); | |
742 | return ret; | |
1da177e4 LT |
743 | } |
744 | ||
1da177e4 LT |
745 | static struct notifier_block dn_fib_dnaddr_notifier = { |
746 | .notifier_call = dn_fib_dnaddr_event, | |
747 | }; | |
748 | ||
749 | void __exit dn_fib_cleanup(void) | |
750 | { | |
751 | dn_fib_table_cleanup(); | |
752 | dn_fib_rules_cleanup(); | |
753 | ||
754 | unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier); | |
755 | } | |
756 | ||
757 | ||
758 | void __init dn_fib_init(void) | |
759 | { | |
1da177e4 LT |
760 | dn_fib_table_init(); |
761 | dn_fib_rules_init(); | |
762 | ||
763 | register_dnaddr_notifier(&dn_fib_dnaddr_notifier); | |
fa34ddd7 TG |
764 | |
765 | rtnl_register(PF_DECnet, RTM_NEWROUTE, dn_fib_rtm_newroute, NULL); | |
766 | rtnl_register(PF_DECnet, RTM_DELROUTE, dn_fib_rtm_delroute, NULL); | |
1da177e4 LT |
767 | } |
768 | ||
769 |