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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> | |
3c618c1d | 45 | #include <net/rtnh.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) { | |
1160dfa1 | 95 | dev_put(nh->nh_dev); |
1da177e4 LT |
96 | nh->nh_dev = NULL; |
97 | } endfor_nexthops(fi); | |
98 | kfree(fi); | |
99 | } | |
100 | ||
101 | void dn_fib_release_info(struct dn_fib_info *fi) | |
102 | { | |
a22ec367 | 103 | spin_lock(&dn_fib_info_lock); |
79976892 | 104 | if (fi && refcount_dec_and_test(&fi->fib_treeref)) { |
1da177e4 LT |
105 | if (fi->fib_next) |
106 | fi->fib_next->fib_prev = fi->fib_prev; | |
107 | if (fi->fib_prev) | |
108 | fi->fib_prev->fib_next = fi->fib_next; | |
109 | if (fi == dn_fib_info_list) | |
110 | dn_fib_info_list = fi->fib_next; | |
111 | fi->fib_dead = 1; | |
112 | dn_fib_info_put(fi); | |
113 | } | |
a22ec367 | 114 | spin_unlock(&dn_fib_info_lock); |
1da177e4 LT |
115 | } |
116 | ||
117 | static inline int dn_fib_nh_comp(const struct dn_fib_info *fi, const struct dn_fib_info *ofi) | |
118 | { | |
119 | const struct dn_fib_nh *onh = ofi->fib_nh; | |
120 | ||
121 | for_nexthops(fi) { | |
122 | if (nh->nh_oif != onh->nh_oif || | |
123 | nh->nh_gw != onh->nh_gw || | |
124 | nh->nh_scope != onh->nh_scope || | |
125 | nh->nh_weight != onh->nh_weight || | |
126 | ((nh->nh_flags^onh->nh_flags)&~RTNH_F_DEAD)) | |
127 | return -1; | |
128 | onh++; | |
129 | } endfor_nexthops(fi); | |
130 | return 0; | |
131 | } | |
132 | ||
133 | static inline struct dn_fib_info *dn_fib_find_info(const struct dn_fib_info *nfi) | |
134 | { | |
135 | for_fib_info() { | |
136 | if (fi->fib_nhs != nfi->fib_nhs) | |
137 | continue; | |
138 | if (nfi->fib_protocol == fi->fib_protocol && | |
139 | nfi->fib_prefsrc == fi->fib_prefsrc && | |
140 | nfi->fib_priority == fi->fib_priority && | |
141 | memcmp(nfi->fib_metrics, fi->fib_metrics, sizeof(fi->fib_metrics)) == 0 && | |
142 | ((nfi->fib_flags^fi->fib_flags)&~RTNH_F_DEAD) == 0 && | |
143 | (nfi->fib_nhs == 0 || dn_fib_nh_comp(fi, nfi) == 0)) | |
144 | return fi; | |
145 | } endfor_fib_info(); | |
146 | return NULL; | |
147 | } | |
148 | ||
58d7d8f9 | 149 | static int dn_fib_count_nhs(const struct nlattr *attr) |
1da177e4 | 150 | { |
58d7d8f9 TG |
151 | struct rtnexthop *nhp = nla_data(attr); |
152 | int nhs = 0, nhlen = nla_len(attr); | |
1da177e4 | 153 | |
ab58298c | 154 | while (rtnh_ok(nhp, nhlen)) { |
1da177e4 | 155 | nhs++; |
ab58298c | 156 | nhp = rtnh_next(nhp, &nhlen); |
1da177e4 LT |
157 | } |
158 | ||
ab58298c VN |
159 | /* leftover implies invalid nexthop configuration, discard it */ |
160 | return nhlen > 0 ? 0 : nhs; | |
1da177e4 LT |
161 | } |
162 | ||
58d7d8f9 TG |
163 | static int dn_fib_get_nhs(struct dn_fib_info *fi, const struct nlattr *attr, |
164 | const struct rtmsg *r) | |
1da177e4 | 165 | { |
58d7d8f9 TG |
166 | struct rtnexthop *nhp = nla_data(attr); |
167 | int nhlen = nla_len(attr); | |
1da177e4 LT |
168 | |
169 | change_nexthops(fi) { | |
ab58298c VN |
170 | int attrlen; |
171 | ||
172 | if (!rtnh_ok(nhp, nhlen)) | |
1da177e4 LT |
173 | return -EINVAL; |
174 | ||
175 | nh->nh_flags = (r->rtm_flags&~0xFF) | nhp->rtnh_flags; | |
176 | nh->nh_oif = nhp->rtnh_ifindex; | |
177 | nh->nh_weight = nhp->rtnh_hops + 1; | |
178 | ||
ab58298c VN |
179 | attrlen = rtnh_attrlen(nhp); |
180 | if (attrlen > 0) { | |
58d7d8f9 TG |
181 | struct nlattr *gw_attr; |
182 | ||
183 | gw_attr = nla_find((struct nlattr *) (nhp + 1), attrlen, RTA_GATEWAY); | |
184 | nh->nh_gw = gw_attr ? nla_get_le16(gw_attr) : 0; | |
1da177e4 | 185 | } |
ab58298c VN |
186 | |
187 | nhp = rtnh_next(nhp, &nhlen); | |
1da177e4 LT |
188 | } endfor_nexthops(fi); |
189 | ||
190 | return 0; | |
191 | } | |
192 | ||
193 | ||
194 | static int dn_fib_check_nh(const struct rtmsg *r, struct dn_fib_info *fi, struct dn_fib_nh *nh) | |
195 | { | |
196 | int err; | |
197 | ||
198 | if (nh->nh_gw) { | |
bef55aeb | 199 | struct flowidn fld; |
1da177e4 LT |
200 | struct dn_fib_res res; |
201 | ||
1da177e4 LT |
202 | if (nh->nh_flags&RTNH_F_ONLINK) { |
203 | struct net_device *dev; | |
204 | ||
205 | if (r->rtm_scope >= RT_SCOPE_LINK) | |
206 | return -EINVAL; | |
207 | if (dnet_addr_type(nh->nh_gw) != RTN_UNICAST) | |
208 | return -EINVAL; | |
881d966b | 209 | if ((dev = __dev_get_by_index(&init_net, nh->nh_oif)) == NULL) |
1da177e4 LT |
210 | return -ENODEV; |
211 | if (!(dev->flags&IFF_UP)) | |
212 | return -ENETDOWN; | |
213 | nh->nh_dev = dev; | |
214 | dev_hold(dev); | |
215 | nh->nh_scope = RT_SCOPE_LINK; | |
216 | return 0; | |
217 | } | |
218 | ||
bef55aeb DM |
219 | memset(&fld, 0, sizeof(fld)); |
220 | fld.daddr = nh->nh_gw; | |
221 | fld.flowidn_oif = nh->nh_oif; | |
222 | fld.flowidn_scope = r->rtm_scope + 1; | |
1da177e4 | 223 | |
bef55aeb DM |
224 | if (fld.flowidn_scope < RT_SCOPE_LINK) |
225 | fld.flowidn_scope = RT_SCOPE_LINK; | |
1da177e4 | 226 | |
bef55aeb | 227 | if ((err = dn_fib_lookup(&fld, &res)) != 0) |
1da177e4 LT |
228 | return err; |
229 | ||
230 | err = -EINVAL; | |
231 | if (res.type != RTN_UNICAST && res.type != RTN_LOCAL) | |
232 | goto out; | |
233 | nh->nh_scope = res.scope; | |
234 | nh->nh_oif = DN_FIB_RES_OIF(res); | |
235 | nh->nh_dev = DN_FIB_RES_DEV(res); | |
236 | if (nh->nh_dev == NULL) | |
237 | goto out; | |
238 | dev_hold(nh->nh_dev); | |
239 | err = -ENETDOWN; | |
240 | if (!(nh->nh_dev->flags & IFF_UP)) | |
241 | goto out; | |
242 | err = 0; | |
243 | out: | |
244 | dn_fib_res_put(&res); | |
245 | return err; | |
246 | } else { | |
247 | struct net_device *dev; | |
248 | ||
249 | if (nh->nh_flags&(RTNH_F_PERVASIVE|RTNH_F_ONLINK)) | |
250 | return -EINVAL; | |
251 | ||
881d966b | 252 | dev = __dev_get_by_index(&init_net, nh->nh_oif); |
1da177e4 LT |
253 | if (dev == NULL || dev->dn_ptr == NULL) |
254 | return -ENODEV; | |
255 | if (!(dev->flags&IFF_UP)) | |
256 | return -ENETDOWN; | |
257 | nh->nh_dev = dev; | |
258 | dev_hold(nh->nh_dev); | |
259 | nh->nh_scope = RT_SCOPE_HOST; | |
260 | } | |
261 | ||
262 | return 0; | |
263 | } | |
264 | ||
265 | ||
58d7d8f9 TG |
266 | struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r, struct nlattr *attrs[], |
267 | const struct nlmsghdr *nlh, int *errp) | |
1da177e4 LT |
268 | { |
269 | int err; | |
270 | struct dn_fib_info *fi = NULL; | |
271 | struct dn_fib_info *ofi; | |
272 | int nhs = 1; | |
273 | ||
a9791011 TG |
274 | if (r->rtm_type > RTN_MAX) |
275 | goto err_inval; | |
276 | ||
1da177e4 LT |
277 | if (dn_fib_props[r->rtm_type].scope > r->rtm_scope) |
278 | goto err_inval; | |
279 | ||
58d7d8f9 TG |
280 | if (attrs[RTA_MULTIPATH] && |
281 | (nhs = dn_fib_count_nhs(attrs[RTA_MULTIPATH])) == 0) | |
282 | goto err_inval; | |
1da177e4 | 283 | |
bb3e16ad | 284 | fi = kzalloc(struct_size(fi, fib_nh, nhs), GFP_KERNEL); |
1da177e4 LT |
285 | err = -ENOBUFS; |
286 | if (fi == NULL) | |
287 | goto failure; | |
1da177e4 LT |
288 | |
289 | fi->fib_protocol = r->rtm_protocol; | |
290 | fi->fib_nhs = nhs; | |
291 | fi->fib_flags = r->rtm_flags; | |
1da177e4 | 292 | |
58d7d8f9 TG |
293 | if (attrs[RTA_PRIORITY]) |
294 | fi->fib_priority = nla_get_u32(attrs[RTA_PRIORITY]); | |
295 | ||
296 | if (attrs[RTA_METRICS]) { | |
297 | struct nlattr *attr; | |
298 | int rem; | |
95c96174 | 299 | |
58d7d8f9 TG |
300 | nla_for_each_nested(attr, attrs[RTA_METRICS], rem) { |
301 | int type = nla_type(attr); | |
302 | ||
303 | if (type) { | |
ea697639 DB |
304 | if (type > RTAX_MAX || type == RTAX_CC_ALGO || |
305 | nla_len(attr) < 4) | |
1da177e4 | 306 | goto err_inval; |
58d7d8f9 TG |
307 | |
308 | fi->fib_metrics[type-1] = nla_get_u32(attr); | |
1da177e4 | 309 | } |
1da177e4 LT |
310 | } |
311 | } | |
1da177e4 | 312 | |
58d7d8f9 TG |
313 | if (attrs[RTA_PREFSRC]) |
314 | fi->fib_prefsrc = nla_get_le16(attrs[RTA_PREFSRC]); | |
315 | ||
316 | if (attrs[RTA_MULTIPATH]) { | |
317 | if ((err = dn_fib_get_nhs(fi, attrs[RTA_MULTIPATH], r)) != 0) | |
1da177e4 | 318 | goto failure; |
58d7d8f9 TG |
319 | |
320 | if (attrs[RTA_OIF] && | |
321 | fi->fib_nh->nh_oif != nla_get_u32(attrs[RTA_OIF])) | |
1da177e4 | 322 | goto err_inval; |
58d7d8f9 TG |
323 | |
324 | if (attrs[RTA_GATEWAY] && | |
325 | fi->fib_nh->nh_gw != nla_get_le16(attrs[RTA_GATEWAY])) | |
1da177e4 LT |
326 | goto err_inval; |
327 | } else { | |
328 | struct dn_fib_nh *nh = fi->fib_nh; | |
58d7d8f9 TG |
329 | |
330 | if (attrs[RTA_OIF]) | |
331 | nh->nh_oif = nla_get_u32(attrs[RTA_OIF]); | |
332 | ||
333 | if (attrs[RTA_GATEWAY]) | |
334 | nh->nh_gw = nla_get_le16(attrs[RTA_GATEWAY]); | |
335 | ||
1da177e4 LT |
336 | nh->nh_flags = r->rtm_flags; |
337 | nh->nh_weight = 1; | |
338 | } | |
339 | ||
340 | if (r->rtm_type == RTN_NAT) { | |
58d7d8f9 | 341 | if (!attrs[RTA_GATEWAY] || nhs != 1 || attrs[RTA_OIF]) |
1da177e4 | 342 | goto err_inval; |
58d7d8f9 TG |
343 | |
344 | fi->fib_nh->nh_gw = nla_get_le16(attrs[RTA_GATEWAY]); | |
1da177e4 LT |
345 | goto link_it; |
346 | } | |
347 | ||
348 | if (dn_fib_props[r->rtm_type].error) { | |
58d7d8f9 | 349 | if (attrs[RTA_GATEWAY] || attrs[RTA_OIF] || attrs[RTA_MULTIPATH]) |
1da177e4 | 350 | goto err_inval; |
58d7d8f9 | 351 | |
1da177e4 LT |
352 | goto link_it; |
353 | } | |
354 | ||
355 | if (r->rtm_scope > RT_SCOPE_HOST) | |
356 | goto err_inval; | |
357 | ||
358 | if (r->rtm_scope == RT_SCOPE_HOST) { | |
359 | struct dn_fib_nh *nh = fi->fib_nh; | |
360 | ||
361 | /* Local address is added */ | |
362 | if (nhs != 1 || nh->nh_gw) | |
363 | goto err_inval; | |
364 | nh->nh_scope = RT_SCOPE_NOWHERE; | |
881d966b | 365 | nh->nh_dev = dev_get_by_index(&init_net, fi->fib_nh->nh_oif); |
1da177e4 LT |
366 | err = -ENODEV; |
367 | if (nh->nh_dev == NULL) | |
368 | goto failure; | |
369 | } else { | |
370 | change_nexthops(fi) { | |
371 | if ((err = dn_fib_check_nh(r, fi, nh)) != 0) | |
372 | goto failure; | |
373 | } endfor_nexthops(fi) | |
374 | } | |
375 | ||
376 | if (fi->fib_prefsrc) { | |
58d7d8f9 TG |
377 | if (r->rtm_type != RTN_LOCAL || !attrs[RTA_DST] || |
378 | fi->fib_prefsrc != nla_get_le16(attrs[RTA_DST])) | |
1da177e4 LT |
379 | if (dnet_addr_type(fi->fib_prefsrc) != RTN_LOCAL) |
380 | goto err_inval; | |
381 | } | |
382 | ||
383 | link_it: | |
384 | if ((ofi = dn_fib_find_info(fi)) != NULL) { | |
385 | fi->fib_dead = 1; | |
386 | dn_fib_free_info(fi); | |
79976892 | 387 | refcount_inc(&ofi->fib_treeref); |
1da177e4 LT |
388 | return ofi; |
389 | } | |
390 | ||
bebc3bbf | 391 | refcount_set(&fi->fib_treeref, 1); |
e0542dd5 | 392 | refcount_set(&fi->fib_clntref, 1); |
a22ec367 | 393 | spin_lock(&dn_fib_info_lock); |
1da177e4 LT |
394 | fi->fib_next = dn_fib_info_list; |
395 | fi->fib_prev = NULL; | |
396 | if (dn_fib_info_list) | |
397 | dn_fib_info_list->fib_prev = fi; | |
398 | dn_fib_info_list = fi; | |
a22ec367 | 399 | spin_unlock(&dn_fib_info_lock); |
1da177e4 LT |
400 | return fi; |
401 | ||
402 | err_inval: | |
403 | err = -EINVAL; | |
404 | ||
405 | failure: | |
406 | *errp = err; | |
407 | if (fi) { | |
408 | fi->fib_dead = 1; | |
409 | dn_fib_free_info(fi); | |
410 | } | |
411 | ||
412 | return NULL; | |
413 | } | |
414 | ||
bef55aeb | 415 | int dn_fib_semantic_match(int type, struct dn_fib_info *fi, const struct flowidn *fld, struct dn_fib_res *res) |
1da177e4 LT |
416 | { |
417 | int err = dn_fib_props[type].error; | |
418 | ||
419 | if (err == 0) { | |
420 | if (fi->fib_flags & RTNH_F_DEAD) | |
421 | return 1; | |
422 | ||
423 | res->fi = fi; | |
424 | ||
06f8fe11 JP |
425 | switch (type) { |
426 | case RTN_NAT: | |
427 | DN_FIB_RES_RESET(*res); | |
e0542dd5 | 428 | refcount_inc(&fi->fib_clntref); |
06f8fe11 JP |
429 | return 0; |
430 | case RTN_UNICAST: | |
431 | case RTN_LOCAL: | |
432 | for_nexthops(fi) { | |
433 | if (nh->nh_flags & RTNH_F_DEAD) | |
434 | continue; | |
435 | if (!fld->flowidn_oif || | |
436 | fld->flowidn_oif == nh->nh_oif) | |
437 | break; | |
438 | } | |
439 | if (nhsel < fi->fib_nhs) { | |
440 | res->nh_sel = nhsel; | |
e0542dd5 | 441 | refcount_inc(&fi->fib_clntref); |
1da177e4 | 442 | return 0; |
06f8fe11 JP |
443 | } |
444 | endfor_nexthops(fi); | |
445 | res->fi = NULL; | |
446 | return 1; | |
447 | default: | |
e87cc472 JP |
448 | net_err_ratelimited("DECnet: impossible routing event : dn_fib_semantic_match type=%d\n", |
449 | type); | |
06f8fe11 JP |
450 | res->fi = NULL; |
451 | return -EINVAL; | |
1da177e4 LT |
452 | } |
453 | } | |
454 | return err; | |
455 | } | |
456 | ||
bef55aeb | 457 | void dn_fib_select_multipath(const struct flowidn *fld, struct dn_fib_res *res) |
1da177e4 LT |
458 | { |
459 | struct dn_fib_info *fi = res->fi; | |
460 | int w; | |
461 | ||
462 | spin_lock_bh(&dn_fib_multipath_lock); | |
463 | if (fi->fib_power <= 0) { | |
464 | int power = 0; | |
465 | change_nexthops(fi) { | |
466 | if (!(nh->nh_flags&RTNH_F_DEAD)) { | |
467 | power += nh->nh_weight; | |
468 | nh->nh_power = nh->nh_weight; | |
469 | } | |
470 | } endfor_nexthops(fi); | |
471 | fi->fib_power = power; | |
472 | if (power < 0) { | |
473 | spin_unlock_bh(&dn_fib_multipath_lock); | |
474 | res->nh_sel = 0; | |
475 | return; | |
476 | } | |
477 | } | |
478 | ||
479 | w = jiffies % fi->fib_power; | |
480 | ||
481 | change_nexthops(fi) { | |
482 | if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) { | |
483 | if ((w -= nh->nh_power) <= 0) { | |
484 | nh->nh_power--; | |
485 | fi->fib_power--; | |
486 | res->nh_sel = nhsel; | |
487 | spin_unlock_bh(&dn_fib_multipath_lock); | |
488 | return; | |
489 | } | |
490 | } | |
491 | } endfor_nexthops(fi); | |
492 | res->nh_sel = 0; | |
493 | spin_unlock_bh(&dn_fib_multipath_lock); | |
494 | } | |
495 | ||
58d7d8f9 | 496 | static inline u32 rtm_get_table(struct nlattr *attrs[], u8 table) |
4c3af034 | 497 | { |
58d7d8f9 TG |
498 | if (attrs[RTA_TABLE]) |
499 | table = nla_get_u32(attrs[RTA_TABLE]); | |
4c3af034 TG |
500 | |
501 | return table; | |
502 | } | |
503 | ||
c21ef3e3 DA |
504 | static int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
505 | struct netlink_ext_ack *extack) | |
1da177e4 | 506 | { |
3b1e0a65 | 507 | struct net *net = sock_net(skb->sk); |
1da177e4 | 508 | struct dn_fib_table *tb; |
58d7d8f9 TG |
509 | struct rtmsg *r = nlmsg_data(nlh); |
510 | struct nlattr *attrs[RTA_MAX+1]; | |
511 | int err; | |
1da177e4 | 512 | |
90f62cf3 | 513 | if (!netlink_capable(skb, CAP_NET_ADMIN)) |
dfc47ef8 EB |
514 | return -EPERM; |
515 | ||
09ad9bc7 | 516 | if (!net_eq(net, &init_net)) |
b854272b DL |
517 | return -EINVAL; |
518 | ||
8cb08174 JB |
519 | err = nlmsg_parse_deprecated(nlh, sizeof(*r), attrs, RTA_MAX, |
520 | rtm_dn_policy, extack); | |
58d7d8f9 TG |
521 | if (err < 0) |
522 | return err; | |
1da177e4 | 523 | |
58d7d8f9 TG |
524 | tb = dn_fib_get_table(rtm_get_table(attrs, r->rtm_table), 0); |
525 | if (!tb) | |
526 | return -ESRCH; | |
1da177e4 | 527 | |
58d7d8f9 | 528 | return tb->delete(tb, r, attrs, nlh, &NETLINK_CB(skb)); |
1da177e4 LT |
529 | } |
530 | ||
c21ef3e3 DA |
531 | static int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, |
532 | struct netlink_ext_ack *extack) | |
1da177e4 | 533 | { |
3b1e0a65 | 534 | struct net *net = sock_net(skb->sk); |
1da177e4 | 535 | struct dn_fib_table *tb; |
58d7d8f9 TG |
536 | struct rtmsg *r = nlmsg_data(nlh); |
537 | struct nlattr *attrs[RTA_MAX+1]; | |
538 | int err; | |
1da177e4 | 539 | |
90f62cf3 | 540 | if (!netlink_capable(skb, CAP_NET_ADMIN)) |
dfc47ef8 EB |
541 | return -EPERM; |
542 | ||
09ad9bc7 | 543 | if (!net_eq(net, &init_net)) |
b854272b DL |
544 | return -EINVAL; |
545 | ||
8cb08174 JB |
546 | err = nlmsg_parse_deprecated(nlh, sizeof(*r), attrs, RTA_MAX, |
547 | rtm_dn_policy, extack); | |
58d7d8f9 TG |
548 | if (err < 0) |
549 | return err; | |
1da177e4 | 550 | |
58d7d8f9 TG |
551 | tb = dn_fib_get_table(rtm_get_table(attrs, r->rtm_table), 1); |
552 | if (!tb) | |
553 | return -ENOBUFS; | |
1da177e4 | 554 | |
58d7d8f9 | 555 | return tb->insert(tb, r, attrs, nlh, &NETLINK_CB(skb)); |
1da177e4 LT |
556 | } |
557 | ||
c4ea94ab | 558 | static void fib_magic(int cmd, int type, __le16 dst, int dst_len, struct dn_ifaddr *ifa) |
1da177e4 LT |
559 | { |
560 | struct dn_fib_table *tb; | |
561 | struct { | |
562 | struct nlmsghdr nlh; | |
563 | struct rtmsg rtm; | |
564 | } req; | |
58d7d8f9 TG |
565 | struct { |
566 | struct nlattr hdr; | |
567 | __le16 dst; | |
568 | } dst_attr = { | |
569 | .dst = dst, | |
570 | }; | |
571 | struct { | |
572 | struct nlattr hdr; | |
573 | __le16 prefsrc; | |
574 | } prefsrc_attr = { | |
575 | .prefsrc = ifa->ifa_local, | |
576 | }; | |
577 | struct { | |
578 | struct nlattr hdr; | |
579 | u32 oif; | |
580 | } oif_attr = { | |
581 | .oif = ifa->ifa_dev->dev->ifindex, | |
582 | }; | |
583 | struct nlattr *attrs[RTA_MAX+1] = { | |
584 | [RTA_DST] = (struct nlattr *) &dst_attr, | |
585 | [RTA_PREFSRC] = (struct nlattr * ) &prefsrc_attr, | |
586 | [RTA_OIF] = (struct nlattr *) &oif_attr, | |
587 | }; | |
1da177e4 LT |
588 | |
589 | memset(&req.rtm, 0, sizeof(req.rtm)); | |
1da177e4 LT |
590 | |
591 | if (type == RTN_UNICAST) | |
592 | tb = dn_fib_get_table(RT_MIN_TABLE, 1); | |
593 | else | |
594 | tb = dn_fib_get_table(RT_TABLE_LOCAL, 1); | |
595 | ||
596 | if (tb == NULL) | |
597 | return; | |
598 | ||
599 | req.nlh.nlmsg_len = sizeof(req); | |
600 | req.nlh.nlmsg_type = cmd; | |
601 | req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND; | |
602 | req.nlh.nlmsg_pid = 0; | |
603 | req.nlh.nlmsg_seq = 0; | |
604 | ||
605 | req.rtm.rtm_dst_len = dst_len; | |
606 | req.rtm.rtm_table = tb->n; | |
607 | req.rtm.rtm_protocol = RTPROT_KERNEL; | |
608 | req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST); | |
609 | req.rtm.rtm_type = type; | |
610 | ||
1da177e4 | 611 | if (cmd == RTM_NEWROUTE) |
58d7d8f9 | 612 | tb->insert(tb, &req.rtm, attrs, &req.nlh, NULL); |
1da177e4 | 613 | else |
58d7d8f9 | 614 | tb->delete(tb, &req.rtm, attrs, &req.nlh, NULL); |
1da177e4 LT |
615 | } |
616 | ||
617 | static void dn_fib_add_ifaddr(struct dn_ifaddr *ifa) | |
618 | { | |
619 | ||
620 | fib_magic(RTM_NEWROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa); | |
621 | ||
622 | #if 0 | |
623 | if (!(dev->flags&IFF_UP)) | |
624 | return; | |
625 | /* In the future, we will want to add default routes here */ | |
626 | ||
627 | #endif | |
628 | } | |
629 | ||
630 | static void dn_fib_del_ifaddr(struct dn_ifaddr *ifa) | |
631 | { | |
632 | int found_it = 0; | |
633 | struct net_device *dev; | |
634 | struct dn_dev *dn_db; | |
635 | struct dn_ifaddr *ifa2; | |
636 | ||
637 | ASSERT_RTNL(); | |
638 | ||
639 | /* Scan device list */ | |
c6d14c84 ED |
640 | rcu_read_lock(); |
641 | for_each_netdev_rcu(&init_net, dev) { | |
fc766e4c | 642 | dn_db = rcu_dereference(dev->dn_ptr); |
1da177e4 LT |
643 | if (dn_db == NULL) |
644 | continue; | |
fc766e4c ED |
645 | for (ifa2 = rcu_dereference(dn_db->ifa_list); |
646 | ifa2 != NULL; | |
647 | ifa2 = rcu_dereference(ifa2->ifa_next)) { | |
1da177e4 LT |
648 | if (ifa2->ifa_local == ifa->ifa_local) { |
649 | found_it = 1; | |
650 | break; | |
651 | } | |
652 | } | |
653 | } | |
c6d14c84 | 654 | rcu_read_unlock(); |
1da177e4 LT |
655 | |
656 | if (found_it == 0) { | |
657 | fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa); | |
658 | ||
659 | if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) { | |
660 | if (dn_fib_sync_down(ifa->ifa_local, NULL, 0)) | |
661 | dn_fib_flush(); | |
662 | } | |
663 | } | |
664 | } | |
665 | ||
666 | static void dn_fib_disable_addr(struct net_device *dev, int force) | |
667 | { | |
668 | if (dn_fib_sync_down(0, dev, force)) | |
669 | dn_fib_flush(); | |
670 | dn_rt_cache_flush(0); | |
671 | neigh_ifdown(&dn_neigh_table, dev); | |
672 | } | |
673 | ||
674 | static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr) | |
675 | { | |
676 | struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr; | |
677 | ||
06f8fe11 JP |
678 | switch (event) { |
679 | case NETDEV_UP: | |
680 | dn_fib_add_ifaddr(ifa); | |
681 | dn_fib_sync_up(ifa->ifa_dev->dev); | |
682 | dn_rt_cache_flush(-1); | |
683 | break; | |
684 | case NETDEV_DOWN: | |
685 | dn_fib_del_ifaddr(ifa); | |
686 | if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) { | |
687 | dn_fib_disable_addr(ifa->ifa_dev->dev, 1); | |
688 | } else { | |
1da177e4 | 689 | dn_rt_cache_flush(-1); |
06f8fe11 JP |
690 | } |
691 | break; | |
1da177e4 LT |
692 | } |
693 | return NOTIFY_DONE; | |
694 | } | |
695 | ||
2aa7f36c | 696 | static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force) |
1da177e4 | 697 | { |
429eb0fa YH |
698 | int ret = 0; |
699 | int scope = RT_SCOPE_NOWHERE; | |
700 | ||
701 | if (force) | |
702 | scope = -1; | |
703 | ||
704 | for_fib_info() { | |
705 | /* | |
706 | * This makes no sense for DECnet.... we will almost | |
707 | * certainly have more than one local address the same | |
708 | * over all our interfaces. It needs thinking about | |
709 | * some more. | |
710 | */ | |
711 | if (local && fi->fib_prefsrc == local) { | |
712 | fi->fib_flags |= RTNH_F_DEAD; | |
713 | ret++; | |
714 | } else if (dev && fi->fib_nhs) { | |
715 | int dead = 0; | |
716 | ||
717 | change_nexthops(fi) { | |
718 | if (nh->nh_flags&RTNH_F_DEAD) | |
719 | dead++; | |
720 | else if (nh->nh_dev == dev && | |
721 | nh->nh_scope != scope) { | |
1da177e4 | 722 | spin_lock_bh(&dn_fib_multipath_lock); |
429eb0fa YH |
723 | nh->nh_flags |= RTNH_F_DEAD; |
724 | fi->fib_power -= nh->nh_power; | |
725 | nh->nh_power = 0; | |
1da177e4 | 726 | spin_unlock_bh(&dn_fib_multipath_lock); |
429eb0fa YH |
727 | dead++; |
728 | } | |
729 | } endfor_nexthops(fi) | |
730 | if (dead == fi->fib_nhs) { | |
731 | fi->fib_flags |= RTNH_F_DEAD; | |
732 | ret++; | |
733 | } | |
734 | } | |
735 | } endfor_fib_info(); | |
736 | return ret; | |
1da177e4 LT |
737 | } |
738 | ||
739 | ||
2aa7f36c | 740 | static int dn_fib_sync_up(struct net_device *dev) |
1da177e4 | 741 | { |
429eb0fa YH |
742 | int ret = 0; |
743 | ||
744 | if (!(dev->flags&IFF_UP)) | |
745 | return 0; | |
746 | ||
747 | for_fib_info() { | |
748 | int alive = 0; | |
749 | ||
750 | change_nexthops(fi) { | |
751 | if (!(nh->nh_flags&RTNH_F_DEAD)) { | |
752 | alive++; | |
753 | continue; | |
754 | } | |
755 | if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP)) | |
756 | continue; | |
757 | if (nh->nh_dev != dev || dev->dn_ptr == NULL) | |
758 | continue; | |
759 | alive++; | |
1da177e4 | 760 | spin_lock_bh(&dn_fib_multipath_lock); |
429eb0fa YH |
761 | nh->nh_power = 0; |
762 | nh->nh_flags &= ~RTNH_F_DEAD; | |
1da177e4 | 763 | spin_unlock_bh(&dn_fib_multipath_lock); |
429eb0fa YH |
764 | } endfor_nexthops(fi); |
765 | ||
766 | if (alive > 0) { | |
767 | fi->fib_flags &= ~RTNH_F_DEAD; | |
768 | ret++; | |
769 | } | |
770 | } endfor_fib_info(); | |
771 | return ret; | |
1da177e4 LT |
772 | } |
773 | ||
1da177e4 LT |
774 | static struct notifier_block dn_fib_dnaddr_notifier = { |
775 | .notifier_call = dn_fib_dnaddr_event, | |
776 | }; | |
777 | ||
778 | void __exit dn_fib_cleanup(void) | |
779 | { | |
780 | dn_fib_table_cleanup(); | |
781 | dn_fib_rules_cleanup(); | |
782 | ||
783 | unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier); | |
784 | } | |
785 | ||
786 | ||
787 | void __init dn_fib_init(void) | |
788 | { | |
1da177e4 LT |
789 | dn_fib_table_init(); |
790 | dn_fib_rules_init(); | |
791 | ||
792 | register_dnaddr_notifier(&dn_fib_dnaddr_notifier); | |
fa34ddd7 | 793 | |
c1c502b5 FW |
794 | rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_NEWROUTE, |
795 | dn_fib_rtm_newroute, NULL, 0); | |
796 | rtnl_register_module(THIS_MODULE, PF_DECnet, RTM_DELROUTE, | |
797 | dn_fib_rtm_delroute, NULL, 0); | |
1da177e4 | 798 | } |