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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * DECnet An implementation of the DECnet protocol suite for the LINUX | |
4 | * operating system. DECnet is implemented using the BSD Socket | |
5 | * interface as the means of communication with the user level. | |
6 | * | |
7 | * DECnet Routing Forwarding Information Base (Glue/Info List) | |
8 | * | |
9 | * Author: Steve Whitehouse <SteveW@ACM.org> | |
10 | * | |
11 | * | |
12 | * Changes: | |
13 | * Alexey Kuznetsov : SMP locking changes | |
14 | * Steve Whitehouse : Rewrote it... Well to be more correct, I | |
15 | * copied most of it from the ipv4 fib code. | |
16 | * Steve Whitehouse : Updated it in style and fixed a few bugs | |
17 | * which were fixed in the ipv4 code since | |
18 | * this code was copied from it. | |
19 | * | |
20 | */ | |
1da177e4 LT |
21 | #include <linux/string.h> |
22 | #include <linux/net.h> | |
23 | #include <linux/socket.h> | |
5a0e3ad6 | 24 | #include <linux/slab.h> |
1da177e4 LT |
25 | #include <linux/sockios.h> |
26 | #include <linux/init.h> | |
27 | #include <linux/skbuff.h> | |
28 | #include <linux/netlink.h> | |
29 | #include <linux/rtnetlink.h> | |
30 | #include <linux/proc_fs.h> | |
31 | #include <linux/netdevice.h> | |
32 | #include <linux/timer.h> | |
33 | #include <linux/spinlock.h> | |
60063497 | 34 | #include <linux/atomic.h> |
7c0f6ba6 | 35 | #include <linux/uaccess.h> |
1da177e4 LT |
36 | #include <net/neighbour.h> |
37 | #include <net/dst.h> | |
38 | #include <net/flow.h> | |
a8731cbf | 39 | #include <net/fib_rules.h> |
1da177e4 LT |
40 | #include <net/dn.h> |
41 | #include <net/dn_route.h> | |
42 | #include <net/dn_fib.h> | |
43 | #include <net/dn_neigh.h> | |
44 | #include <net/dn_dev.h> | |
ab58298c | 45 | #include <net/nexthop.h> |
1da177e4 LT |
46 | |
47 | #define RT_MIN_TABLE 1 | |
48 | ||
49 | #define for_fib_info() { struct dn_fib_info *fi;\ | |
50 | for(fi = dn_fib_info_list; fi; fi = fi->fib_next) | |
51 | #define endfor_fib_info() } | |
52 | ||
53 | #define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\ | |
54 | for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++) | |
55 | ||
56 | #define change_nexthops(fi) { int nhsel; struct dn_fib_nh *nh;\ | |
57 | for(nhsel = 0, nh = (struct dn_fib_nh *)((fi)->fib_nh); nhsel < (fi)->fib_nhs; nh++, nhsel++) | |
58 | ||
59 | #define endfor_nexthops(fi) } | |
60 | ||
1da177e4 LT |
61 | static DEFINE_SPINLOCK(dn_fib_multipath_lock); |
62 | static struct dn_fib_info *dn_fib_info_list; | |
a22ec367 | 63 | static DEFINE_SPINLOCK(dn_fib_info_lock); |
1da177e4 LT |
64 | |
65 | static struct | |
66 | { | |
67 | int error; | |
68 | u8 scope; | |
a9791011 | 69 | } dn_fib_props[RTN_MAX+1] = { |
1da177e4 LT |
70 | [RTN_UNSPEC] = { .error = 0, .scope = RT_SCOPE_NOWHERE }, |
71 | [RTN_UNICAST] = { .error = 0, .scope = RT_SCOPE_UNIVERSE }, | |
72 | [RTN_LOCAL] = { .error = 0, .scope = RT_SCOPE_HOST }, | |
73 | [RTN_BROADCAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE }, | |
74 | [RTN_ANYCAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE }, | |
75 | [RTN_MULTICAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE }, | |
76 | [RTN_BLACKHOLE] = { .error = -EINVAL, .scope = RT_SCOPE_UNIVERSE }, | |
77 | [RTN_UNREACHABLE] = { .error = -EHOSTUNREACH, .scope = RT_SCOPE_UNIVERSE }, | |
78 | [RTN_PROHIBIT] = { .error = -EACCES, .scope = RT_SCOPE_UNIVERSE }, | |
79 | [RTN_THROW] = { .error = -EAGAIN, .scope = RT_SCOPE_UNIVERSE }, | |
80 | [RTN_NAT] = { .error = 0, .scope = RT_SCOPE_NOWHERE }, | |
81 | [RTN_XRESOLVE] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE }, | |
82 | }; | |
83 | ||
2aa7f36c AB |
84 | static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force); |
85 | static int dn_fib_sync_up(struct net_device *dev); | |
86 | ||
1da177e4 LT |
87 | void dn_fib_free_info(struct dn_fib_info *fi) |
88 | { | |
89 | if (fi->fib_dead == 0) { | |
90 | printk(KERN_DEBUG "DECnet: BUG! Attempt to free alive dn_fib_info\n"); | |
91 | return; | |
92 | } | |
93 | ||
94 | change_nexthops(fi) { | |
95 | if (nh->nh_dev) | |
96 | dev_put(nh->nh_dev); | |
97 | nh->nh_dev = NULL; | |
98 | } endfor_nexthops(fi); | |
99 | kfree(fi); | |
100 | } | |
101 | ||
102 | void dn_fib_release_info(struct dn_fib_info *fi) | |
103 | { | |
a22ec367 | 104 | spin_lock(&dn_fib_info_lock); |
1da177e4 LT |
105 | if (fi && --fi->fib_treeref == 0) { |
106 | if (fi->fib_next) | |
107 | fi->fib_next->fib_prev = fi->fib_prev; | |
108 | if (fi->fib_prev) | |
109 | fi->fib_prev->fib_next = fi->fib_next; | |
110 | if (fi == dn_fib_info_list) | |
111 | dn_fib_info_list = fi->fib_next; | |
112 | fi->fib_dead = 1; | |
113 | dn_fib_info_put(fi); | |
114 | } | |
a22ec367 | 115 | spin_unlock(&dn_fib_info_lock); |
1da177e4 LT |
116 | } |
117 | ||
118 | static inline int dn_fib_nh_comp(const struct dn_fib_info *fi, const struct dn_fib_info *ofi) | |
119 | { | |
120 | const struct dn_fib_nh *onh = ofi->fib_nh; | |
121 | ||
122 | for_nexthops(fi) { | |
123 | if (nh->nh_oif != onh->nh_oif || | |
124 | nh->nh_gw != onh->nh_gw || | |
125 | nh->nh_scope != onh->nh_scope || | |
126 | nh->nh_weight != onh->nh_weight || | |
127 | ((nh->nh_flags^onh->nh_flags)&~RTNH_F_DEAD)) | |
128 | return -1; | |
129 | onh++; | |
130 | } endfor_nexthops(fi); | |
131 | return 0; | |
132 | } | |
133 | ||
134 | static inline struct dn_fib_info *dn_fib_find_info(const struct dn_fib_info *nfi) | |
135 | { | |
136 | for_fib_info() { | |
137 | if (fi->fib_nhs != nfi->fib_nhs) | |
138 | continue; | |
139 | if (nfi->fib_protocol == fi->fib_protocol && | |
140 | nfi->fib_prefsrc == fi->fib_prefsrc && | |
141 | nfi->fib_priority == fi->fib_priority && | |
142 | memcmp(nfi->fib_metrics, fi->fib_metrics, sizeof(fi->fib_metrics)) == 0 && | |
143 | ((nfi->fib_flags^fi->fib_flags)&~RTNH_F_DEAD) == 0 && | |
144 | (nfi->fib_nhs == 0 || dn_fib_nh_comp(fi, nfi) == 0)) | |
145 | return fi; | |
146 | } endfor_fib_info(); | |
147 | return NULL; | |
148 | } | |
149 | ||
58d7d8f9 | 150 | static int dn_fib_count_nhs(const struct nlattr *attr) |
1da177e4 | 151 | { |
58d7d8f9 TG |
152 | struct rtnexthop *nhp = nla_data(attr); |
153 | int nhs = 0, nhlen = nla_len(attr); | |
1da177e4 | 154 | |
ab58298c | 155 | while (rtnh_ok(nhp, nhlen)) { |
1da177e4 | 156 | nhs++; |
ab58298c | 157 | nhp = rtnh_next(nhp, &nhlen); |
1da177e4 LT |
158 | } |
159 | ||
ab58298c VN |
160 | /* leftover implies invalid nexthop configuration, discard it */ |
161 | return nhlen > 0 ? 0 : nhs; | |
1da177e4 LT |
162 | } |
163 | ||
58d7d8f9 TG |
164 | static int dn_fib_get_nhs(struct dn_fib_info *fi, const struct nlattr *attr, |
165 | const struct rtmsg *r) | |
1da177e4 | 166 | { |
58d7d8f9 TG |
167 | struct rtnexthop *nhp = nla_data(attr); |
168 | int nhlen = nla_len(attr); | |
1da177e4 LT |
169 | |
170 | change_nexthops(fi) { | |
ab58298c VN |
171 | int attrlen; |
172 | ||
173 | if (!rtnh_ok(nhp, nhlen)) | |
1da177e4 LT |
174 | return -EINVAL; |
175 | ||
176 | nh->nh_flags = (r->rtm_flags&~0xFF) | nhp->rtnh_flags; | |
177 | nh->nh_oif = nhp->rtnh_ifindex; | |
178 | nh->nh_weight = nhp->rtnh_hops + 1; | |
179 | ||
ab58298c VN |
180 | attrlen = rtnh_attrlen(nhp); |
181 | if (attrlen > 0) { | |
58d7d8f9 TG |
182 | struct nlattr *gw_attr; |
183 | ||
184 | gw_attr = nla_find((struct nlattr *) (nhp + 1), attrlen, RTA_GATEWAY); | |
185 | nh->nh_gw = gw_attr ? nla_get_le16(gw_attr) : 0; | |
1da177e4 | 186 | } |
ab58298c VN |
187 | |
188 | nhp = rtnh_next(nhp, &nhlen); | |
1da177e4 LT |
189 | } endfor_nexthops(fi); |
190 | ||
191 | return 0; | |
192 | } | |
193 | ||
194 | ||
195 | static int dn_fib_check_nh(const struct rtmsg *r, struct dn_fib_info *fi, struct dn_fib_nh *nh) | |
196 | { | |
197 | int err; | |
198 | ||
199 | if (nh->nh_gw) { | |
bef55aeb | 200 | struct flowidn fld; |
1da177e4 LT |
201 | struct dn_fib_res res; |
202 | ||
1da177e4 LT |
203 | if (nh->nh_flags&RTNH_F_ONLINK) { |
204 | struct net_device *dev; | |
205 | ||
206 | if (r->rtm_scope >= RT_SCOPE_LINK) | |
207 | return -EINVAL; | |
208 | if (dnet_addr_type(nh->nh_gw) != RTN_UNICAST) | |
209 | return -EINVAL; | |
881d966b | 210 | if ((dev = __dev_get_by_index(&init_net, nh->nh_oif)) == NULL) |
1da177e4 LT |
211 | return -ENODEV; |
212 | if (!(dev->flags&IFF_UP)) | |
213 | return -ENETDOWN; | |
214 | nh->nh_dev = dev; | |
215 | dev_hold(dev); | |
216 | nh->nh_scope = RT_SCOPE_LINK; | |
217 | return 0; | |
218 | } | |
219 | ||
bef55aeb DM |
220 | memset(&fld, 0, sizeof(fld)); |
221 | fld.daddr = nh->nh_gw; | |
222 | fld.flowidn_oif = nh->nh_oif; | |
223 | fld.flowidn_scope = r->rtm_scope + 1; | |
1da177e4 | 224 | |
bef55aeb DM |
225 | if (fld.flowidn_scope < RT_SCOPE_LINK) |
226 | fld.flowidn_scope = RT_SCOPE_LINK; | |
1da177e4 | 227 | |
bef55aeb | 228 | if ((err = dn_fib_lookup(&fld, &res)) != 0) |
1da177e4 LT |
229 | return err; |
230 | ||
231 | err = -EINVAL; | |
232 | if (res.type != RTN_UNICAST && res.type != RTN_LOCAL) | |
233 | goto out; | |
234 | nh->nh_scope = res.scope; | |
235 | nh->nh_oif = DN_FIB_RES_OIF(res); | |
236 | nh->nh_dev = DN_FIB_RES_DEV(res); | |
237 | if (nh->nh_dev == NULL) | |
238 | goto out; | |
239 | dev_hold(nh->nh_dev); | |
240 | err = -ENETDOWN; | |
241 | if (!(nh->nh_dev->flags & IFF_UP)) | |
242 | goto out; | |
243 | err = 0; | |
244 | out: | |
245 | dn_fib_res_put(&res); | |
246 | return err; | |
247 | } else { | |
248 | struct net_device *dev; | |
249 | ||
250 | if (nh->nh_flags&(RTNH_F_PERVASIVE|RTNH_F_ONLINK)) | |
251 | return -EINVAL; | |
252 | ||
881d966b | 253 | dev = __dev_get_by_index(&init_net, nh->nh_oif); |
1da177e4 LT |
254 | if (dev == NULL || dev->dn_ptr == NULL) |
255 | return -ENODEV; | |
256 | if (!(dev->flags&IFF_UP)) | |
257 | return -ENETDOWN; | |
258 | nh->nh_dev = dev; | |
259 | dev_hold(nh->nh_dev); | |
260 | nh->nh_scope = RT_SCOPE_HOST; | |
261 | } | |
262 | ||
263 | return 0; | |
264 | } | |
265 | ||
266 | ||
58d7d8f9 TG |
267 | struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r, struct nlattr *attrs[], |
268 | const struct nlmsghdr *nlh, int *errp) | |
1da177e4 LT |
269 | { |
270 | int err; | |
271 | struct dn_fib_info *fi = NULL; | |
272 | struct dn_fib_info *ofi; | |
273 | int nhs = 1; | |
274 | ||
a9791011 TG |
275 | if (r->rtm_type > RTN_MAX) |
276 | goto err_inval; | |
277 | ||
1da177e4 LT |
278 | if (dn_fib_props[r->rtm_type].scope > r->rtm_scope) |
279 | goto err_inval; | |
280 | ||
58d7d8f9 TG |
281 | if (attrs[RTA_MULTIPATH] && |
282 | (nhs = dn_fib_count_nhs(attrs[RTA_MULTIPATH])) == 0) | |
283 | goto err_inval; | |
1da177e4 | 284 | |
0da974f4 | 285 | fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct dn_fib_nh), GFP_KERNEL); |
1da177e4 LT |
286 | err = -ENOBUFS; |
287 | if (fi == NULL) | |
288 | goto failure; | |
1da177e4 LT |
289 | |
290 | fi->fib_protocol = r->rtm_protocol; | |
291 | fi->fib_nhs = nhs; | |
292 | fi->fib_flags = r->rtm_flags; | |
1da177e4 | 293 | |
58d7d8f9 TG |
294 | if (attrs[RTA_PRIORITY]) |
295 | fi->fib_priority = nla_get_u32(attrs[RTA_PRIORITY]); | |
296 | ||
297 | if (attrs[RTA_METRICS]) { | |
298 | struct nlattr *attr; | |
299 | int rem; | |
95c96174 | 300 | |
58d7d8f9 TG |
301 | nla_for_each_nested(attr, attrs[RTA_METRICS], rem) { |
302 | int type = nla_type(attr); | |
303 | ||
304 | if (type) { | |
ea697639 DB |
305 | if (type > RTAX_MAX || type == RTAX_CC_ALGO || |
306 | nla_len(attr) < 4) | |
1da177e4 | 307 | goto err_inval; |
58d7d8f9 TG |
308 | |
309 | fi->fib_metrics[type-1] = nla_get_u32(attr); | |
1da177e4 | 310 | } |
1da177e4 LT |
311 | } |
312 | } | |
1da177e4 | 313 | |
58d7d8f9 TG |
314 | if (attrs[RTA_PREFSRC]) |
315 | fi->fib_prefsrc = nla_get_le16(attrs[RTA_PREFSRC]); | |
316 | ||
317 | if (attrs[RTA_MULTIPATH]) { | |
318 | if ((err = dn_fib_get_nhs(fi, attrs[RTA_MULTIPATH], r)) != 0) | |
1da177e4 | 319 | goto failure; |
58d7d8f9 TG |
320 | |
321 | if (attrs[RTA_OIF] && | |
322 | fi->fib_nh->nh_oif != nla_get_u32(attrs[RTA_OIF])) | |
1da177e4 | 323 | goto err_inval; |
58d7d8f9 TG |
324 | |
325 | if (attrs[RTA_GATEWAY] && | |
326 | fi->fib_nh->nh_gw != nla_get_le16(attrs[RTA_GATEWAY])) | |
1da177e4 LT |
327 | goto err_inval; |
328 | } else { | |
329 | struct dn_fib_nh *nh = fi->fib_nh; | |
58d7d8f9 TG |
330 | |
331 | if (attrs[RTA_OIF]) | |
332 | nh->nh_oif = nla_get_u32(attrs[RTA_OIF]); | |
333 | ||
334 | if (attrs[RTA_GATEWAY]) | |
335 | nh->nh_gw = nla_get_le16(attrs[RTA_GATEWAY]); | |
336 | ||
1da177e4 LT |
337 | nh->nh_flags = r->rtm_flags; |
338 | nh->nh_weight = 1; | |
339 | } | |
340 | ||
341 | if (r->rtm_type == RTN_NAT) { | |
58d7d8f9 | 342 | if (!attrs[RTA_GATEWAY] || nhs != 1 || attrs[RTA_OIF]) |
1da177e4 | 343 | goto err_inval; |
58d7d8f9 TG |
344 | |
345 | fi->fib_nh->nh_gw = nla_get_le16(attrs[RTA_GATEWAY]); | |
1da177e4 LT |
346 | goto link_it; |
347 | } | |
348 | ||
349 | if (dn_fib_props[r->rtm_type].error) { | |
58d7d8f9 | 350 | if (attrs[RTA_GATEWAY] || attrs[RTA_OIF] || attrs[RTA_MULTIPATH]) |
1da177e4 | 351 | goto err_inval; |
58d7d8f9 | 352 | |
1da177e4 LT |
353 | goto link_it; |
354 | } | |
355 | ||
356 | if (r->rtm_scope > RT_SCOPE_HOST) | |
357 | goto err_inval; | |
358 | ||
359 | if (r->rtm_scope == RT_SCOPE_HOST) { | |
360 | struct dn_fib_nh *nh = fi->fib_nh; | |
361 | ||
362 | /* Local address is added */ | |
363 | if (nhs != 1 || nh->nh_gw) | |
364 | goto err_inval; | |
365 | nh->nh_scope = RT_SCOPE_NOWHERE; | |
881d966b | 366 | nh->nh_dev = dev_get_by_index(&init_net, fi->fib_nh->nh_oif); |
1da177e4 LT |
367 | err = -ENODEV; |
368 | if (nh->nh_dev == NULL) | |
369 | goto failure; | |
370 | } else { | |
371 | change_nexthops(fi) { | |
372 | if ((err = dn_fib_check_nh(r, fi, nh)) != 0) | |
373 | goto failure; | |
374 | } endfor_nexthops(fi) | |
375 | } | |
376 | ||
377 | if (fi->fib_prefsrc) { | |
58d7d8f9 TG |
378 | if (r->rtm_type != RTN_LOCAL || !attrs[RTA_DST] || |
379 | fi->fib_prefsrc != nla_get_le16(attrs[RTA_DST])) | |
1da177e4 LT |
380 | if (dnet_addr_type(fi->fib_prefsrc) != RTN_LOCAL) |
381 | goto err_inval; | |
382 | } | |
383 | ||
384 | link_it: | |
385 | if ((ofi = dn_fib_find_info(fi)) != NULL) { | |
386 | fi->fib_dead = 1; | |
387 | dn_fib_free_info(fi); | |
388 | ofi->fib_treeref++; | |
389 | return ofi; | |
390 | } | |
391 | ||
392 | fi->fib_treeref++; | |
e0542dd5 | 393 | refcount_set(&fi->fib_clntref, 1); |
a22ec367 | 394 | spin_lock(&dn_fib_info_lock); |
1da177e4 LT |
395 | fi->fib_next = dn_fib_info_list; |
396 | fi->fib_prev = NULL; | |
397 | if (dn_fib_info_list) | |
398 | dn_fib_info_list->fib_prev = fi; | |
399 | dn_fib_info_list = fi; | |
a22ec367 | 400 | spin_unlock(&dn_fib_info_lock); |
1da177e4 LT |
401 | return fi; |
402 | ||
403 | err_inval: | |
404 | err = -EINVAL; | |
405 | ||
406 | failure: | |
407 | *errp = err; | |
408 | if (fi) { | |
409 | fi->fib_dead = 1; | |
410 | dn_fib_free_info(fi); | |
411 | } | |
412 | ||
413 | return NULL; | |
414 | } | |
415 | ||
bef55aeb | 416 | int dn_fib_semantic_match(int type, struct dn_fib_info *fi, const struct flowidn *fld, struct dn_fib_res *res) |
1da177e4 LT |
417 | { |
418 | int err = dn_fib_props[type].error; | |
419 | ||
420 | if (err == 0) { | |
421 | if (fi->fib_flags & RTNH_F_DEAD) | |
422 | return 1; | |
423 | ||
424 | res->fi = fi; | |
425 | ||
06f8fe11 JP |
426 | switch (type) { |
427 | case RTN_NAT: | |
428 | DN_FIB_RES_RESET(*res); | |
e0542dd5 | 429 | refcount_inc(&fi->fib_clntref); |
06f8fe11 JP |
430 | return 0; |
431 | case RTN_UNICAST: | |
432 | case RTN_LOCAL: | |
433 | for_nexthops(fi) { | |
434 | if (nh->nh_flags & RTNH_F_DEAD) | |
435 | continue; | |
436 | if (!fld->flowidn_oif || | |
437 | fld->flowidn_oif == nh->nh_oif) | |
438 | break; | |
439 | } | |
440 | if (nhsel < fi->fib_nhs) { | |
441 | res->nh_sel = nhsel; | |
e0542dd5 | 442 | refcount_inc(&fi->fib_clntref); |
1da177e4 | 443 | return 0; |
06f8fe11 JP |
444 | } |
445 | endfor_nexthops(fi); | |
446 | res->fi = NULL; | |
447 | return 1; | |
448 | default: | |
e87cc472 JP |
449 | net_err_ratelimited("DECnet: impossible routing event : dn_fib_semantic_match type=%d\n", |
450 | type); | |
06f8fe11 JP |
451 | res->fi = NULL; |
452 | return -EINVAL; | |
1da177e4 LT |
453 | } |
454 | } | |
455 | return err; | |
456 | } | |
457 | ||
bef55aeb | 458 | void dn_fib_select_multipath(const struct flowidn *fld, struct dn_fib_res *res) |
1da177e4 LT |
459 | { |
460 | struct dn_fib_info *fi = res->fi; | |
461 | int w; | |
462 | ||
463 | spin_lock_bh(&dn_fib_multipath_lock); | |
464 | if (fi->fib_power <= 0) { | |
465 | int power = 0; | |
466 | change_nexthops(fi) { | |
467 | if (!(nh->nh_flags&RTNH_F_DEAD)) { | |
468 | power += nh->nh_weight; | |
469 | nh->nh_power = nh->nh_weight; | |
470 | } | |
471 | } endfor_nexthops(fi); | |
472 | fi->fib_power = power; | |
473 | if (power < 0) { | |
474 | spin_unlock_bh(&dn_fib_multipath_lock); | |
475 | res->nh_sel = 0; | |
476 | return; | |
477 | } | |
478 | } | |
479 | ||
480 | w = jiffies % fi->fib_power; | |
481 | ||
482 | change_nexthops(fi) { | |
483 | if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) { | |
484 | if ((w -= nh->nh_power) <= 0) { | |
485 | nh->nh_power--; | |
486 | fi->fib_power--; | |
487 | res->nh_sel = nhsel; | |
488 | spin_unlock_bh(&dn_fib_multipath_lock); | |
489 | return; | |
490 | } | |
491 | } | |
492 | } endfor_nexthops(fi); | |
493 | res->nh_sel = 0; | |
494 | spin_unlock_bh(&dn_fib_multipath_lock); | |
495 | } | |
496 | ||
58d7d8f9 | 497 | static inline u32 rtm_get_table(struct nlattr *attrs[], u8 table) |
4c3af034 | 498 | { |
58d7d8f9 TG |
499 | if (attrs[RTA_TABLE]) |
500 | table = nla_get_u32(attrs[RTA_TABLE]); | |
4c3af034 TG |
501 | |
502 | return table; | |
503 | } | |
504 | ||
c21ef3e3 DA |
505 | static int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
506 | struct netlink_ext_ack *extack) | |
1da177e4 | 507 | { |
3b1e0a65 | 508 | struct net *net = sock_net(skb->sk); |
1da177e4 | 509 | struct dn_fib_table *tb; |
58d7d8f9 TG |
510 | struct rtmsg *r = nlmsg_data(nlh); |
511 | struct nlattr *attrs[RTA_MAX+1]; | |
512 | int err; | |
1da177e4 | 513 | |
90f62cf3 | 514 | if (!netlink_capable(skb, CAP_NET_ADMIN)) |
dfc47ef8 EB |
515 | return -EPERM; |
516 | ||
09ad9bc7 | 517 | if (!net_eq(net, &init_net)) |
b854272b DL |
518 | return -EINVAL; |
519 | ||
fceb6435 | 520 | err = nlmsg_parse(nlh, sizeof(*r), attrs, RTA_MAX, rtm_dn_policy, |
c21ef3e3 | 521 | extack); |
58d7d8f9 TG |
522 | if (err < 0) |
523 | return err; | |
1da177e4 | 524 | |
58d7d8f9 TG |
525 | tb = dn_fib_get_table(rtm_get_table(attrs, r->rtm_table), 0); |
526 | if (!tb) | |
527 | return -ESRCH; | |
1da177e4 | 528 | |
58d7d8f9 | 529 | return tb->delete(tb, r, attrs, nlh, &NETLINK_CB(skb)); |
1da177e4 LT |
530 | } |
531 | ||
c21ef3e3 DA |
532 | static int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
533 | struct netlink_ext_ack *extack) | |
1da177e4 | 534 | { |
3b1e0a65 | 535 | struct net *net = sock_net(skb->sk); |
1da177e4 | 536 | struct dn_fib_table *tb; |
58d7d8f9 TG |
537 | struct rtmsg *r = nlmsg_data(nlh); |
538 | struct nlattr *attrs[RTA_MAX+1]; | |
539 | int err; | |
1da177e4 | 540 | |
90f62cf3 | 541 | if (!netlink_capable(skb, CAP_NET_ADMIN)) |
dfc47ef8 EB |
542 | return -EPERM; |
543 | ||
09ad9bc7 | 544 | if (!net_eq(net, &init_net)) |
b854272b DL |
545 | return -EINVAL; |
546 | ||
fceb6435 | 547 | err = nlmsg_parse(nlh, sizeof(*r), attrs, RTA_MAX, rtm_dn_policy, |
c21ef3e3 | 548 | extack); |
58d7d8f9 TG |
549 | if (err < 0) |
550 | return err; | |
1da177e4 | 551 | |
58d7d8f9 TG |
552 | tb = dn_fib_get_table(rtm_get_table(attrs, r->rtm_table), 1); |
553 | if (!tb) | |
554 | return -ENOBUFS; | |
1da177e4 | 555 | |
58d7d8f9 | 556 | return tb->insert(tb, r, attrs, nlh, &NETLINK_CB(skb)); |
1da177e4 LT |
557 | } |
558 | ||
c4ea94ab | 559 | static void fib_magic(int cmd, int type, __le16 dst, int dst_len, struct dn_ifaddr *ifa) |
1da177e4 LT |
560 | { |
561 | struct dn_fib_table *tb; | |
562 | struct { | |
563 | struct nlmsghdr nlh; | |
564 | struct rtmsg rtm; | |
565 | } req; | |
58d7d8f9 TG |
566 | struct { |
567 | struct nlattr hdr; | |
568 | __le16 dst; | |
569 | } dst_attr = { | |
570 | .dst = dst, | |
571 | }; | |
572 | struct { | |
573 | struct nlattr hdr; | |
574 | __le16 prefsrc; | |
575 | } prefsrc_attr = { | |
576 | .prefsrc = ifa->ifa_local, | |
577 | }; | |
578 | struct { | |
579 | struct nlattr hdr; | |
580 | u32 oif; | |
581 | } oif_attr = { | |
582 | .oif = ifa->ifa_dev->dev->ifindex, | |
583 | }; | |
584 | struct nlattr *attrs[RTA_MAX+1] = { | |
585 | [RTA_DST] = (struct nlattr *) &dst_attr, | |
586 | [RTA_PREFSRC] = (struct nlattr * ) &prefsrc_attr, | |
587 | [RTA_OIF] = (struct nlattr *) &oif_attr, | |
588 | }; | |
1da177e4 LT |
589 | |
590 | memset(&req.rtm, 0, sizeof(req.rtm)); | |
1da177e4 LT |
591 | |
592 | if (type == RTN_UNICAST) | |
593 | tb = dn_fib_get_table(RT_MIN_TABLE, 1); | |
594 | else | |
595 | tb = dn_fib_get_table(RT_TABLE_LOCAL, 1); | |
596 | ||
597 | if (tb == NULL) | |
598 | return; | |
599 | ||
600 | req.nlh.nlmsg_len = sizeof(req); | |
601 | req.nlh.nlmsg_type = cmd; | |
602 | req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND; | |
603 | req.nlh.nlmsg_pid = 0; | |
604 | req.nlh.nlmsg_seq = 0; | |
605 | ||
606 | req.rtm.rtm_dst_len = dst_len; | |
607 | req.rtm.rtm_table = tb->n; | |
608 | req.rtm.rtm_protocol = RTPROT_KERNEL; | |
609 | req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST); | |
610 | req.rtm.rtm_type = type; | |
611 | ||
1da177e4 | 612 | if (cmd == RTM_NEWROUTE) |
58d7d8f9 | 613 | tb->insert(tb, &req.rtm, attrs, &req.nlh, NULL); |
1da177e4 | 614 | else |
58d7d8f9 | 615 | tb->delete(tb, &req.rtm, attrs, &req.nlh, NULL); |
1da177e4 LT |
616 | } |
617 | ||
618 | static void dn_fib_add_ifaddr(struct dn_ifaddr *ifa) | |
619 | { | |
620 | ||
621 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa); | |
622 | ||
623 | #if 0 | |
624 | if (!(dev->flags&IFF_UP)) | |
625 | return; | |
626 | /* In the future, we will want to add default routes here */ | |
627 | ||
628 | #endif | |
629 | } | |
630 | ||
631 | static void dn_fib_del_ifaddr(struct dn_ifaddr *ifa) | |
632 | { | |
633 | int found_it = 0; | |
634 | struct net_device *dev; | |
635 | struct dn_dev *dn_db; | |
636 | struct dn_ifaddr *ifa2; | |
637 | ||
638 | ASSERT_RTNL(); | |
639 | ||
640 | /* Scan device list */ | |
c6d14c84 ED |
641 | rcu_read_lock(); |
642 | for_each_netdev_rcu(&init_net, dev) { | |
fc766e4c | 643 | dn_db = rcu_dereference(dev->dn_ptr); |
1da177e4 LT |
644 | if (dn_db == NULL) |
645 | continue; | |
fc766e4c ED |
646 | for (ifa2 = rcu_dereference(dn_db->ifa_list); |
647 | ifa2 != NULL; | |
648 | ifa2 = rcu_dereference(ifa2->ifa_next)) { | |
1da177e4 LT |
649 | if (ifa2->ifa_local == ifa->ifa_local) { |
650 | found_it = 1; | |
651 | break; | |
652 | } | |
653 | } | |
654 | } | |
c6d14c84 | 655 | rcu_read_unlock(); |
1da177e4 LT |
656 | |
657 | if (found_it == 0) { | |
658 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa); | |
659 | ||
660 | if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) { | |
661 | if (dn_fib_sync_down(ifa->ifa_local, NULL, 0)) | |
662 | dn_fib_flush(); | |
663 | } | |
664 | } | |
665 | } | |
666 | ||
667 | static void dn_fib_disable_addr(struct net_device *dev, int force) | |
668 | { | |
669 | if (dn_fib_sync_down(0, dev, force)) | |
670 | dn_fib_flush(); | |
671 | dn_rt_cache_flush(0); | |
672 | neigh_ifdown(&dn_neigh_table, dev); | |
673 | } | |
674 | ||
675 | static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
676 | { | |
677 | struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr; | |
678 | ||
06f8fe11 JP |
679 | switch (event) { |
680 | case NETDEV_UP: | |
681 | dn_fib_add_ifaddr(ifa); | |
682 | dn_fib_sync_up(ifa->ifa_dev->dev); | |
683 | dn_rt_cache_flush(-1); | |
684 | break; | |
685 | case NETDEV_DOWN: | |
686 | dn_fib_del_ifaddr(ifa); | |
687 | if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) { | |
688 | dn_fib_disable_addr(ifa->ifa_dev->dev, 1); | |
689 | } else { | |
1da177e4 | 690 | dn_rt_cache_flush(-1); |
06f8fe11 JP |
691 | } |
692 | break; | |
1da177e4 LT |
693 | } |
694 | return NOTIFY_DONE; | |
695 | } | |
696 | ||
2aa7f36c | 697 | static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force) |
1da177e4 | 698 | { |
429eb0fa YH |
699 | int ret = 0; |
700 | int scope = RT_SCOPE_NOWHERE; | |
701 | ||
702 | if (force) | |
703 | scope = -1; | |
704 | ||
705 | for_fib_info() { | |
706 | /* | |
707 | * This makes no sense for DECnet.... we will almost | |
708 | * certainly have more than one local address the same | |
709 | * over all our interfaces. It needs thinking about | |
710 | * some more. | |
711 | */ | |
712 | if (local && fi->fib_prefsrc == local) { | |
713 | fi->fib_flags |= RTNH_F_DEAD; | |
714 | ret++; | |
715 | } else if (dev && fi->fib_nhs) { | |
716 | int dead = 0; | |
717 | ||
718 | change_nexthops(fi) { | |
719 | if (nh->nh_flags&RTNH_F_DEAD) | |
720 | dead++; | |
721 | else if (nh->nh_dev == dev && | |
722 | nh->nh_scope != scope) { | |
1da177e4 | 723 | spin_lock_bh(&dn_fib_multipath_lock); |
429eb0fa YH |
724 | nh->nh_flags |= RTNH_F_DEAD; |
725 | fi->fib_power -= nh->nh_power; | |
726 | nh->nh_power = 0; | |
1da177e4 | 727 | spin_unlock_bh(&dn_fib_multipath_lock); |
429eb0fa YH |
728 | dead++; |
729 | } | |
730 | } endfor_nexthops(fi) | |
731 | if (dead == fi->fib_nhs) { | |
732 | fi->fib_flags |= RTNH_F_DEAD; | |
733 | ret++; | |
734 | } | |
735 | } | |
736 | } endfor_fib_info(); | |
737 | return ret; | |
1da177e4 LT |
738 | } |
739 | ||
740 | ||
2aa7f36c | 741 | static int dn_fib_sync_up(struct net_device *dev) |
1da177e4 | 742 | { |
429eb0fa YH |
743 | int ret = 0; |
744 | ||
745 | if (!(dev->flags&IFF_UP)) | |
746 | return 0; | |
747 | ||
748 | for_fib_info() { | |
749 | int alive = 0; | |
750 | ||
751 | change_nexthops(fi) { | |
752 | if (!(nh->nh_flags&RTNH_F_DEAD)) { | |
753 | alive++; | |
754 | continue; | |
755 | } | |
756 | if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP)) | |
757 | continue; | |
758 | if (nh->nh_dev != dev || dev->dn_ptr == NULL) | |
759 | continue; | |
760 | alive++; | |
1da177e4 | 761 | spin_lock_bh(&dn_fib_multipath_lock); |
429eb0fa YH |
762 | nh->nh_power = 0; |
763 | nh->nh_flags &= ~RTNH_F_DEAD; | |
1da177e4 | 764 | spin_unlock_bh(&dn_fib_multipath_lock); |
429eb0fa YH |
765 | } endfor_nexthops(fi); |
766 | ||
767 | if (alive > 0) { | |
768 | fi->fib_flags &= ~RTNH_F_DEAD; | |
769 | ret++; | |
770 | } | |
771 | } endfor_fib_info(); | |
772 | return ret; | |
1da177e4 LT |
773 | } |
774 | ||
1da177e4 LT |
775 | static struct notifier_block dn_fib_dnaddr_notifier = { |
776 | .notifier_call = dn_fib_dnaddr_event, | |
777 | }; | |
778 | ||
779 | void __exit dn_fib_cleanup(void) | |
780 | { | |
781 | dn_fib_table_cleanup(); | |
782 | dn_fib_rules_cleanup(); | |
783 | ||
784 | unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier); | |
785 | } | |
786 | ||
787 | ||
788 | void __init dn_fib_init(void) | |
789 | { | |
1da177e4 LT |
790 | dn_fib_table_init(); |
791 | dn_fib_rules_init(); | |
792 | ||
793 | register_dnaddr_notifier(&dn_fib_dnaddr_notifier); | |
fa34ddd7 | 794 | |
b97bac64 FW |
795 | rtnl_register(PF_DECnet, RTM_NEWROUTE, dn_fib_rtm_newroute, NULL, 0); |
796 | rtnl_register(PF_DECnet, RTM_DELROUTE, dn_fib_rtm_delroute, NULL, 0); | |
1da177e4 LT |
797 | } |
798 | ||
799 |