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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> | |
37 | #include <net/dn.h> | |
38 | #include <net/dn_route.h> | |
39 | #include <net/dn_fib.h> | |
40 | #include <net/dn_neigh.h> | |
41 | #include <net/dn_dev.h> | |
42 | ||
43 | #define RT_MIN_TABLE 1 | |
44 | ||
45 | #define for_fib_info() { struct dn_fib_info *fi;\ | |
46 | for(fi = dn_fib_info_list; fi; fi = fi->fib_next) | |
47 | #define endfor_fib_info() } | |
48 | ||
49 | #define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\ | |
50 | for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++) | |
51 | ||
52 | #define change_nexthops(fi) { int nhsel; struct dn_fib_nh *nh;\ | |
53 | for(nhsel = 0, nh = (struct dn_fib_nh *)((fi)->fib_nh); nhsel < (fi)->fib_nhs; nh++, nhsel++) | |
54 | ||
55 | #define endfor_nexthops(fi) } | |
56 | ||
57 | extern int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb); | |
58 | ||
59 | static DEFINE_SPINLOCK(dn_fib_multipath_lock); | |
60 | static struct dn_fib_info *dn_fib_info_list; | |
61 | static DEFINE_RWLOCK(dn_fib_info_lock); | |
62 | ||
63 | static struct | |
64 | { | |
65 | int error; | |
66 | u8 scope; | |
67 | } dn_fib_props[RTA_MAX+1] = { | |
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 | ||
82 | void dn_fib_free_info(struct dn_fib_info *fi) | |
83 | { | |
84 | if (fi->fib_dead == 0) { | |
85 | printk(KERN_DEBUG "DECnet: BUG! Attempt to free alive dn_fib_info\n"); | |
86 | return; | |
87 | } | |
88 | ||
89 | change_nexthops(fi) { | |
90 | if (nh->nh_dev) | |
91 | dev_put(nh->nh_dev); | |
92 | nh->nh_dev = NULL; | |
93 | } endfor_nexthops(fi); | |
94 | kfree(fi); | |
95 | } | |
96 | ||
97 | void dn_fib_release_info(struct dn_fib_info *fi) | |
98 | { | |
99 | write_lock(&dn_fib_info_lock); | |
100 | if (fi && --fi->fib_treeref == 0) { | |
101 | if (fi->fib_next) | |
102 | fi->fib_next->fib_prev = fi->fib_prev; | |
103 | if (fi->fib_prev) | |
104 | fi->fib_prev->fib_next = fi->fib_next; | |
105 | if (fi == dn_fib_info_list) | |
106 | dn_fib_info_list = fi->fib_next; | |
107 | fi->fib_dead = 1; | |
108 | dn_fib_info_put(fi); | |
109 | } | |
110 | write_unlock(&dn_fib_info_lock); | |
111 | } | |
112 | ||
113 | static inline int dn_fib_nh_comp(const struct dn_fib_info *fi, const struct dn_fib_info *ofi) | |
114 | { | |
115 | const struct dn_fib_nh *onh = ofi->fib_nh; | |
116 | ||
117 | for_nexthops(fi) { | |
118 | if (nh->nh_oif != onh->nh_oif || | |
119 | nh->nh_gw != onh->nh_gw || | |
120 | nh->nh_scope != onh->nh_scope || | |
121 | nh->nh_weight != onh->nh_weight || | |
122 | ((nh->nh_flags^onh->nh_flags)&~RTNH_F_DEAD)) | |
123 | return -1; | |
124 | onh++; | |
125 | } endfor_nexthops(fi); | |
126 | return 0; | |
127 | } | |
128 | ||
129 | static inline struct dn_fib_info *dn_fib_find_info(const struct dn_fib_info *nfi) | |
130 | { | |
131 | for_fib_info() { | |
132 | if (fi->fib_nhs != nfi->fib_nhs) | |
133 | continue; | |
134 | if (nfi->fib_protocol == fi->fib_protocol && | |
135 | nfi->fib_prefsrc == fi->fib_prefsrc && | |
136 | nfi->fib_priority == fi->fib_priority && | |
137 | memcmp(nfi->fib_metrics, fi->fib_metrics, sizeof(fi->fib_metrics)) == 0 && | |
138 | ((nfi->fib_flags^fi->fib_flags)&~RTNH_F_DEAD) == 0 && | |
139 | (nfi->fib_nhs == 0 || dn_fib_nh_comp(fi, nfi) == 0)) | |
140 | return fi; | |
141 | } endfor_fib_info(); | |
142 | return NULL; | |
143 | } | |
144 | ||
c4ea94ab | 145 | __le16 dn_fib_get_attr16(struct rtattr *attr, int attrlen, int type) |
1da177e4 LT |
146 | { |
147 | while(RTA_OK(attr,attrlen)) { | |
148 | if (attr->rta_type == type) | |
c4ea94ab | 149 | return *(__le16*)RTA_DATA(attr); |
1da177e4 LT |
150 | attr = RTA_NEXT(attr, attrlen); |
151 | } | |
152 | ||
153 | return 0; | |
154 | } | |
155 | ||
156 | static int dn_fib_count_nhs(struct rtattr *rta) | |
157 | { | |
158 | int nhs = 0; | |
159 | struct rtnexthop *nhp = RTA_DATA(rta); | |
160 | int nhlen = RTA_PAYLOAD(rta); | |
161 | ||
162 | while(nhlen >= (int)sizeof(struct rtnexthop)) { | |
163 | if ((nhlen -= nhp->rtnh_len) < 0) | |
164 | return 0; | |
165 | nhs++; | |
166 | nhp = RTNH_NEXT(nhp); | |
167 | } | |
168 | ||
169 | return nhs; | |
170 | } | |
171 | ||
172 | static int dn_fib_get_nhs(struct dn_fib_info *fi, const struct rtattr *rta, const struct rtmsg *r) | |
173 | { | |
174 | struct rtnexthop *nhp = RTA_DATA(rta); | |
175 | int nhlen = RTA_PAYLOAD(rta); | |
176 | ||
177 | change_nexthops(fi) { | |
178 | int attrlen = nhlen - sizeof(struct rtnexthop); | |
179 | if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0) | |
180 | return -EINVAL; | |
181 | ||
182 | nh->nh_flags = (r->rtm_flags&~0xFF) | nhp->rtnh_flags; | |
183 | nh->nh_oif = nhp->rtnh_ifindex; | |
184 | nh->nh_weight = nhp->rtnh_hops + 1; | |
185 | ||
186 | if (attrlen) { | |
187 | nh->nh_gw = dn_fib_get_attr16(RTNH_DATA(nhp), attrlen, RTA_GATEWAY); | |
188 | } | |
189 | nhp = RTNH_NEXT(nhp); | |
190 | } endfor_nexthops(fi); | |
191 | ||
192 | return 0; | |
193 | } | |
194 | ||
195 | ||
196 | static int dn_fib_check_nh(const struct rtmsg *r, struct dn_fib_info *fi, struct dn_fib_nh *nh) | |
197 | { | |
198 | int err; | |
199 | ||
200 | if (nh->nh_gw) { | |
201 | struct flowi fl; | |
202 | struct dn_fib_res res; | |
203 | ||
204 | memset(&fl, 0, sizeof(fl)); | |
205 | ||
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; | |
213 | if ((dev = __dev_get_by_index(nh->nh_oif)) == NULL) | |
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 | ||
256 | dev = __dev_get_by_index(nh->nh_oif); | |
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 | ||
277 | if (dn_fib_props[r->rtm_type].scope > r->rtm_scope) | |
278 | goto err_inval; | |
279 | ||
280 | if (rta->rta_mp) { | |
281 | nhs = dn_fib_count_nhs(rta->rta_mp); | |
282 | if (nhs == 0) | |
283 | goto err_inval; | |
284 | } | |
285 | ||
0da974f4 | 286 | fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct dn_fib_nh), GFP_KERNEL); |
1da177e4 LT |
287 | err = -ENOBUFS; |
288 | if (fi == NULL) | |
289 | goto failure; | |
1da177e4 LT |
290 | |
291 | fi->fib_protocol = r->rtm_protocol; | |
292 | fi->fib_nhs = nhs; | |
293 | fi->fib_flags = r->rtm_flags; | |
294 | if (rta->rta_priority) | |
295 | fi->fib_priority = *rta->rta_priority; | |
296 | if (rta->rta_mx) { | |
297 | int attrlen = RTA_PAYLOAD(rta->rta_mx); | |
298 | struct rtattr *attr = RTA_DATA(rta->rta_mx); | |
299 | ||
300 | while(RTA_OK(attr, attrlen)) { | |
301 | unsigned flavour = attr->rta_type; | |
302 | if (flavour) { | |
303 | if (flavour > RTAX_MAX) | |
304 | goto err_inval; | |
305 | fi->fib_metrics[flavour-1] = *(unsigned*)RTA_DATA(attr); | |
306 | } | |
307 | attr = RTA_NEXT(attr, attrlen); | |
308 | } | |
309 | } | |
310 | if (rta->rta_prefsrc) | |
311 | memcpy(&fi->fib_prefsrc, rta->rta_prefsrc, 2); | |
312 | ||
313 | if (rta->rta_mp) { | |
314 | if ((err = dn_fib_get_nhs(fi, rta->rta_mp, r)) != 0) | |
315 | goto failure; | |
316 | if (rta->rta_oif && fi->fib_nh->nh_oif != *rta->rta_oif) | |
317 | goto err_inval; | |
318 | if (rta->rta_gw && memcmp(&fi->fib_nh->nh_gw, rta->rta_gw, 2)) | |
319 | goto err_inval; | |
320 | } else { | |
321 | struct dn_fib_nh *nh = fi->fib_nh; | |
322 | if (rta->rta_oif) | |
323 | nh->nh_oif = *rta->rta_oif; | |
324 | if (rta->rta_gw) | |
325 | memcpy(&nh->nh_gw, rta->rta_gw, 2); | |
326 | nh->nh_flags = r->rtm_flags; | |
327 | nh->nh_weight = 1; | |
328 | } | |
329 | ||
330 | if (r->rtm_type == RTN_NAT) { | |
331 | if (rta->rta_gw == NULL || nhs != 1 || rta->rta_oif) | |
332 | goto err_inval; | |
333 | memcpy(&fi->fib_nh->nh_gw, rta->rta_gw, 2); | |
334 | goto link_it; | |
335 | } | |
336 | ||
337 | if (dn_fib_props[r->rtm_type].error) { | |
338 | if (rta->rta_gw || rta->rta_oif || rta->rta_mp) | |
339 | goto err_inval; | |
340 | goto link_it; | |
341 | } | |
342 | ||
343 | if (r->rtm_scope > RT_SCOPE_HOST) | |
344 | goto err_inval; | |
345 | ||
346 | if (r->rtm_scope == RT_SCOPE_HOST) { | |
347 | struct dn_fib_nh *nh = fi->fib_nh; | |
348 | ||
349 | /* Local address is added */ | |
350 | if (nhs != 1 || nh->nh_gw) | |
351 | goto err_inval; | |
352 | nh->nh_scope = RT_SCOPE_NOWHERE; | |
353 | nh->nh_dev = dev_get_by_index(fi->fib_nh->nh_oif); | |
354 | err = -ENODEV; | |
355 | if (nh->nh_dev == NULL) | |
356 | goto failure; | |
357 | } else { | |
358 | change_nexthops(fi) { | |
359 | if ((err = dn_fib_check_nh(r, fi, nh)) != 0) | |
360 | goto failure; | |
361 | } endfor_nexthops(fi) | |
362 | } | |
363 | ||
364 | if (fi->fib_prefsrc) { | |
365 | if (r->rtm_type != RTN_LOCAL || rta->rta_dst == NULL || | |
366 | memcmp(&fi->fib_prefsrc, rta->rta_dst, 2)) | |
367 | if (dnet_addr_type(fi->fib_prefsrc) != RTN_LOCAL) | |
368 | goto err_inval; | |
369 | } | |
370 | ||
371 | link_it: | |
372 | if ((ofi = dn_fib_find_info(fi)) != NULL) { | |
373 | fi->fib_dead = 1; | |
374 | dn_fib_free_info(fi); | |
375 | ofi->fib_treeref++; | |
376 | return ofi; | |
377 | } | |
378 | ||
379 | fi->fib_treeref++; | |
380 | atomic_inc(&fi->fib_clntref); | |
381 | write_lock(&dn_fib_info_lock); | |
382 | fi->fib_next = dn_fib_info_list; | |
383 | fi->fib_prev = NULL; | |
384 | if (dn_fib_info_list) | |
385 | dn_fib_info_list->fib_prev = fi; | |
386 | dn_fib_info_list = fi; | |
387 | write_unlock(&dn_fib_info_lock); | |
388 | return fi; | |
389 | ||
390 | err_inval: | |
391 | err = -EINVAL; | |
392 | ||
393 | failure: | |
394 | *errp = err; | |
395 | if (fi) { | |
396 | fi->fib_dead = 1; | |
397 | dn_fib_free_info(fi); | |
398 | } | |
399 | ||
400 | return NULL; | |
401 | } | |
402 | ||
403 | int dn_fib_semantic_match(int type, struct dn_fib_info *fi, const struct flowi *fl, struct dn_fib_res *res) | |
404 | { | |
405 | int err = dn_fib_props[type].error; | |
406 | ||
407 | if (err == 0) { | |
408 | if (fi->fib_flags & RTNH_F_DEAD) | |
409 | return 1; | |
410 | ||
411 | res->fi = fi; | |
412 | ||
413 | switch(type) { | |
414 | case RTN_NAT: | |
415 | DN_FIB_RES_RESET(*res); | |
416 | atomic_inc(&fi->fib_clntref); | |
417 | return 0; | |
418 | case RTN_UNICAST: | |
419 | case RTN_LOCAL: | |
420 | for_nexthops(fi) { | |
421 | if (nh->nh_flags & RTNH_F_DEAD) | |
422 | continue; | |
423 | if (!fl->oif || fl->oif == nh->nh_oif) | |
424 | break; | |
425 | } | |
426 | if (nhsel < fi->fib_nhs) { | |
427 | res->nh_sel = nhsel; | |
428 | atomic_inc(&fi->fib_clntref); | |
429 | return 0; | |
430 | } | |
431 | endfor_nexthops(fi); | |
432 | res->fi = NULL; | |
433 | return 1; | |
434 | default: | |
435 | if (net_ratelimit()) | |
436 | printk("DECnet: impossible routing event : dn_fib_semantic_match type=%d\n", type); | |
437 | res->fi = NULL; | |
438 | return -EINVAL; | |
439 | } | |
440 | } | |
441 | return err; | |
442 | } | |
443 | ||
444 | void dn_fib_select_multipath(const struct flowi *fl, struct dn_fib_res *res) | |
445 | { | |
446 | struct dn_fib_info *fi = res->fi; | |
447 | int w; | |
448 | ||
449 | spin_lock_bh(&dn_fib_multipath_lock); | |
450 | if (fi->fib_power <= 0) { | |
451 | int power = 0; | |
452 | change_nexthops(fi) { | |
453 | if (!(nh->nh_flags&RTNH_F_DEAD)) { | |
454 | power += nh->nh_weight; | |
455 | nh->nh_power = nh->nh_weight; | |
456 | } | |
457 | } endfor_nexthops(fi); | |
458 | fi->fib_power = power; | |
459 | if (power < 0) { | |
460 | spin_unlock_bh(&dn_fib_multipath_lock); | |
461 | res->nh_sel = 0; | |
462 | return; | |
463 | } | |
464 | } | |
465 | ||
466 | w = jiffies % fi->fib_power; | |
467 | ||
468 | change_nexthops(fi) { | |
469 | if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) { | |
470 | if ((w -= nh->nh_power) <= 0) { | |
471 | nh->nh_power--; | |
472 | fi->fib_power--; | |
473 | res->nh_sel = nhsel; | |
474 | spin_unlock_bh(&dn_fib_multipath_lock); | |
475 | return; | |
476 | } | |
477 | } | |
478 | } endfor_nexthops(fi); | |
479 | res->nh_sel = 0; | |
480 | spin_unlock_bh(&dn_fib_multipath_lock); | |
481 | } | |
482 | ||
483 | ||
484 | static int dn_fib_check_attr(struct rtmsg *r, struct rtattr **rta) | |
485 | { | |
486 | int i; | |
487 | ||
488 | for(i = 1; i <= RTA_MAX; i++) { | |
489 | struct rtattr *attr = rta[i-1]; | |
490 | if (attr) { | |
491 | if (RTA_PAYLOAD(attr) < 4 && RTA_PAYLOAD(attr) != 2) | |
492 | return -EINVAL; | |
493 | if (i != RTA_MULTIPATH && i != RTA_METRICS) | |
494 | rta[i-1] = (struct rtattr *)RTA_DATA(attr); | |
495 | } | |
496 | } | |
497 | ||
498 | return 0; | |
499 | } | |
500 | ||
501 | int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
502 | { | |
503 | struct dn_fib_table *tb; | |
504 | struct rtattr **rta = arg; | |
505 | struct rtmsg *r = NLMSG_DATA(nlh); | |
506 | ||
507 | if (dn_fib_check_attr(r, rta)) | |
508 | return -EINVAL; | |
509 | ||
510 | tb = dn_fib_get_table(r->rtm_table, 0); | |
511 | if (tb) | |
512 | return tb->delete(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb)); | |
513 | ||
514 | return -ESRCH; | |
515 | } | |
516 | ||
517 | int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) | |
518 | { | |
519 | struct dn_fib_table *tb; | |
520 | struct rtattr **rta = arg; | |
521 | struct rtmsg *r = NLMSG_DATA(nlh); | |
522 | ||
523 | if (dn_fib_check_attr(r, rta)) | |
524 | return -EINVAL; | |
525 | ||
526 | tb = dn_fib_get_table(r->rtm_table, 1); | |
527 | if (tb) | |
528 | return tb->insert(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb)); | |
529 | ||
530 | return -ENOBUFS; | |
531 | } | |
532 | ||
533 | ||
534 | int dn_fib_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
535 | { | |
536 | int t; | |
537 | int s_t; | |
538 | struct dn_fib_table *tb; | |
539 | ||
540 | if (NLMSG_PAYLOAD(cb->nlh, 0) >= sizeof(struct rtmsg) && | |
541 | ((struct rtmsg *)NLMSG_DATA(cb->nlh))->rtm_flags&RTM_F_CLONED) | |
542 | return dn_cache_dump(skb, cb); | |
543 | ||
544 | s_t = cb->args[0]; | |
545 | if (s_t == 0) | |
546 | s_t = cb->args[0] = RT_MIN_TABLE; | |
547 | ||
548 | for(t = s_t; t <= RT_TABLE_MAX; t++) { | |
549 | if (t < s_t) | |
550 | continue; | |
551 | if (t > s_t) | |
db1322b8 TG |
552 | memset(&cb->args[1], 0, |
553 | sizeof(cb->args) - sizeof(cb->args[0])); | |
1da177e4 LT |
554 | tb = dn_fib_get_table(t, 0); |
555 | if (tb == NULL) | |
556 | continue; | |
557 | if (tb->dump(tb, skb, cb) < 0) | |
558 | break; | |
559 | } | |
560 | ||
561 | cb->args[0] = t; | |
562 | ||
563 | return skb->len; | |
564 | } | |
565 | ||
c4ea94ab | 566 | static void fib_magic(int cmd, int type, __le16 dst, int dst_len, struct dn_ifaddr *ifa) |
1da177e4 LT |
567 | { |
568 | struct dn_fib_table *tb; | |
569 | struct { | |
570 | struct nlmsghdr nlh; | |
571 | struct rtmsg rtm; | |
572 | } req; | |
573 | struct dn_kern_rta rta; | |
574 | ||
575 | memset(&req.rtm, 0, sizeof(req.rtm)); | |
576 | memset(&rta, 0, sizeof(rta)); | |
577 | ||
578 | if (type == RTN_UNICAST) | |
579 | tb = dn_fib_get_table(RT_MIN_TABLE, 1); | |
580 | else | |
581 | tb = dn_fib_get_table(RT_TABLE_LOCAL, 1); | |
582 | ||
583 | if (tb == NULL) | |
584 | return; | |
585 | ||
586 | req.nlh.nlmsg_len = sizeof(req); | |
587 | req.nlh.nlmsg_type = cmd; | |
588 | req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND; | |
589 | req.nlh.nlmsg_pid = 0; | |
590 | req.nlh.nlmsg_seq = 0; | |
591 | ||
592 | req.rtm.rtm_dst_len = dst_len; | |
593 | req.rtm.rtm_table = tb->n; | |
594 | req.rtm.rtm_protocol = RTPROT_KERNEL; | |
595 | req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST); | |
596 | req.rtm.rtm_type = type; | |
597 | ||
598 | rta.rta_dst = &dst; | |
599 | rta.rta_prefsrc = &ifa->ifa_local; | |
600 | rta.rta_oif = &ifa->ifa_dev->dev->ifindex; | |
601 | ||
602 | if (cmd == RTM_NEWROUTE) | |
603 | tb->insert(tb, &req.rtm, &rta, &req.nlh, NULL); | |
604 | else | |
605 | tb->delete(tb, &req.rtm, &rta, &req.nlh, NULL); | |
606 | } | |
607 | ||
608 | static void dn_fib_add_ifaddr(struct dn_ifaddr *ifa) | |
609 | { | |
610 | ||
611 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa); | |
612 | ||
613 | #if 0 | |
614 | if (!(dev->flags&IFF_UP)) | |
615 | return; | |
616 | /* In the future, we will want to add default routes here */ | |
617 | ||
618 | #endif | |
619 | } | |
620 | ||
621 | static void dn_fib_del_ifaddr(struct dn_ifaddr *ifa) | |
622 | { | |
623 | int found_it = 0; | |
624 | struct net_device *dev; | |
625 | struct dn_dev *dn_db; | |
626 | struct dn_ifaddr *ifa2; | |
627 | ||
628 | ASSERT_RTNL(); | |
629 | ||
630 | /* Scan device list */ | |
631 | read_lock(&dev_base_lock); | |
632 | for(dev = dev_base; dev; dev = dev->next) { | |
633 | dn_db = dev->dn_ptr; | |
634 | if (dn_db == NULL) | |
635 | continue; | |
636 | for(ifa2 = dn_db->ifa_list; ifa2; ifa2 = ifa2->ifa_next) { | |
637 | if (ifa2->ifa_local == ifa->ifa_local) { | |
638 | found_it = 1; | |
639 | break; | |
640 | } | |
641 | } | |
642 | } | |
643 | read_unlock(&dev_base_lock); | |
644 | ||
645 | if (found_it == 0) { | |
646 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa); | |
647 | ||
648 | if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) { | |
649 | if (dn_fib_sync_down(ifa->ifa_local, NULL, 0)) | |
650 | dn_fib_flush(); | |
651 | } | |
652 | } | |
653 | } | |
654 | ||
655 | static void dn_fib_disable_addr(struct net_device *dev, int force) | |
656 | { | |
657 | if (dn_fib_sync_down(0, dev, force)) | |
658 | dn_fib_flush(); | |
659 | dn_rt_cache_flush(0); | |
660 | neigh_ifdown(&dn_neigh_table, dev); | |
661 | } | |
662 | ||
663 | static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
664 | { | |
665 | struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr; | |
666 | ||
667 | switch(event) { | |
668 | case NETDEV_UP: | |
669 | dn_fib_add_ifaddr(ifa); | |
670 | dn_fib_sync_up(ifa->ifa_dev->dev); | |
671 | dn_rt_cache_flush(-1); | |
672 | break; | |
673 | case NETDEV_DOWN: | |
674 | dn_fib_del_ifaddr(ifa); | |
675 | if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) { | |
676 | dn_fib_disable_addr(ifa->ifa_dev->dev, 1); | |
677 | } else { | |
678 | dn_rt_cache_flush(-1); | |
679 | } | |
680 | break; | |
681 | } | |
682 | return NOTIFY_DONE; | |
683 | } | |
684 | ||
c4ea94ab | 685 | int dn_fib_sync_down(__le16 local, struct net_device *dev, int force) |
1da177e4 LT |
686 | { |
687 | int ret = 0; | |
688 | int scope = RT_SCOPE_NOWHERE; | |
689 | ||
690 | if (force) | |
691 | scope = -1; | |
692 | ||
693 | for_fib_info() { | |
694 | /* | |
695 | * This makes no sense for DECnet.... we will almost | |
696 | * certainly have more than one local address the same | |
697 | * over all our interfaces. It needs thinking about | |
698 | * some more. | |
699 | */ | |
700 | if (local && fi->fib_prefsrc == local) { | |
701 | fi->fib_flags |= RTNH_F_DEAD; | |
702 | ret++; | |
703 | } else if (dev && fi->fib_nhs) { | |
704 | int dead = 0; | |
705 | ||
706 | change_nexthops(fi) { | |
707 | if (nh->nh_flags&RTNH_F_DEAD) | |
708 | dead++; | |
709 | else if (nh->nh_dev == dev && | |
710 | nh->nh_scope != scope) { | |
711 | spin_lock_bh(&dn_fib_multipath_lock); | |
712 | nh->nh_flags |= RTNH_F_DEAD; | |
713 | fi->fib_power -= nh->nh_power; | |
714 | nh->nh_power = 0; | |
715 | spin_unlock_bh(&dn_fib_multipath_lock); | |
716 | dead++; | |
717 | } | |
718 | } endfor_nexthops(fi) | |
719 | if (dead == fi->fib_nhs) { | |
720 | fi->fib_flags |= RTNH_F_DEAD; | |
721 | ret++; | |
722 | } | |
723 | } | |
724 | } endfor_fib_info(); | |
725 | return ret; | |
726 | } | |
727 | ||
728 | ||
729 | int dn_fib_sync_up(struct net_device *dev) | |
730 | { | |
731 | int ret = 0; | |
732 | ||
733 | if (!(dev->flags&IFF_UP)) | |
734 | return 0; | |
735 | ||
736 | for_fib_info() { | |
737 | int alive = 0; | |
738 | ||
739 | change_nexthops(fi) { | |
740 | if (!(nh->nh_flags&RTNH_F_DEAD)) { | |
741 | alive++; | |
742 | continue; | |
743 | } | |
744 | if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP)) | |
745 | continue; | |
746 | if (nh->nh_dev != dev || dev->dn_ptr == NULL) | |
747 | continue; | |
748 | alive++; | |
749 | spin_lock_bh(&dn_fib_multipath_lock); | |
750 | nh->nh_power = 0; | |
751 | nh->nh_flags &= ~RTNH_F_DEAD; | |
752 | spin_unlock_bh(&dn_fib_multipath_lock); | |
753 | } endfor_nexthops(fi); | |
754 | ||
755 | if (alive > 0) { | |
756 | fi->fib_flags &= ~RTNH_F_DEAD; | |
757 | ret++; | |
758 | } | |
759 | } endfor_fib_info(); | |
760 | return ret; | |
761 | } | |
762 | ||
763 | void dn_fib_flush(void) | |
764 | { | |
765 | int flushed = 0; | |
766 | struct dn_fib_table *tb; | |
767 | int id; | |
768 | ||
769 | for(id = RT_TABLE_MAX; id > 0; id--) { | |
770 | if ((tb = dn_fib_get_table(id, 0)) == NULL) | |
771 | continue; | |
772 | flushed += tb->flush(tb); | |
773 | } | |
774 | ||
775 | if (flushed) | |
776 | dn_rt_cache_flush(-1); | |
777 | } | |
778 | ||
779 | static struct notifier_block dn_fib_dnaddr_notifier = { | |
780 | .notifier_call = dn_fib_dnaddr_event, | |
781 | }; | |
782 | ||
783 | void __exit dn_fib_cleanup(void) | |
784 | { | |
785 | dn_fib_table_cleanup(); | |
786 | dn_fib_rules_cleanup(); | |
787 | ||
788 | unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier); | |
789 | } | |
790 | ||
791 | ||
792 | void __init dn_fib_init(void) | |
793 | { | |
794 | ||
795 | dn_fib_table_init(); | |
796 | dn_fib_rules_init(); | |
797 | ||
798 | register_dnaddr_notifier(&dn_fib_dnaddr_notifier); | |
799 | } | |
800 | ||
801 |