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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * net/sched/cls_route.c ROUTE4 classifier. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
5a0e3ad6 | 13 | #include <linux/slab.h> |
1da177e4 LT |
14 | #include <linux/types.h> |
15 | #include <linux/kernel.h> | |
1da177e4 | 16 | #include <linux/string.h> |
1da177e4 | 17 | #include <linux/errno.h> |
1da177e4 | 18 | #include <linux/skbuff.h> |
0ba48053 PM |
19 | #include <net/dst.h> |
20 | #include <net/route.h> | |
21 | #include <net/netlink.h> | |
1da177e4 LT |
22 | #include <net/act_api.h> |
23 | #include <net/pkt_cls.h> | |
24 | ||
25 | /* | |
cc7ec456 ED |
26 | * 1. For now we assume that route tags < 256. |
27 | * It allows to use direct table lookups, instead of hash tables. | |
28 | * 2. For now we assume that "from TAG" and "fromdev DEV" statements | |
29 | * are mutually exclusive. | |
30 | * 3. "to TAG from ANY" has higher priority, than "to ANY from XXX" | |
1da177e4 | 31 | */ |
cc7ec456 | 32 | struct route4_fastmap { |
1109c005 JF |
33 | struct route4_filter *filter; |
34 | u32 id; | |
35 | int iif; | |
1da177e4 LT |
36 | }; |
37 | ||
cc7ec456 | 38 | struct route4_head { |
1109c005 JF |
39 | struct route4_fastmap fastmap[16]; |
40 | struct route4_bucket __rcu *table[256 + 1]; | |
41 | struct rcu_head rcu; | |
1da177e4 LT |
42 | }; |
43 | ||
cc7ec456 | 44 | struct route4_bucket { |
1da177e4 | 45 | /* 16 FROM buckets + 16 IIF buckets + 1 wildcard bucket */ |
1109c005 JF |
46 | struct route4_filter __rcu *ht[16 + 16 + 1]; |
47 | struct rcu_head rcu; | |
1da177e4 LT |
48 | }; |
49 | ||
cc7ec456 | 50 | struct route4_filter { |
1109c005 | 51 | struct route4_filter __rcu *next; |
1da177e4 LT |
52 | u32 id; |
53 | int iif; | |
54 | ||
55 | struct tcf_result res; | |
56 | struct tcf_exts exts; | |
57 | u32 handle; | |
58 | struct route4_bucket *bkt; | |
1109c005 | 59 | struct tcf_proto *tp; |
c2f3f31d CW |
60 | union { |
61 | struct work_struct work; | |
62 | struct rcu_head rcu; | |
63 | }; | |
1da177e4 LT |
64 | }; |
65 | ||
cc7ec456 | 66 | #define ROUTE4_FAILURE ((struct route4_filter *)(-1L)) |
1da177e4 | 67 | |
cc7ec456 | 68 | static inline int route4_fastmap_hash(u32 id, int iif) |
1da177e4 | 69 | { |
cc7ec456 | 70 | return id & 0xF; |
1da177e4 LT |
71 | } |
72 | ||
1109c005 | 73 | static DEFINE_SPINLOCK(fastmap_lock); |
cc7ec456 | 74 | static void |
1109c005 | 75 | route4_reset_fastmap(struct route4_head *head) |
1da177e4 | 76 | { |
1109c005 | 77 | spin_lock_bh(&fastmap_lock); |
1da177e4 | 78 | memset(head->fastmap, 0, sizeof(head->fastmap)); |
1109c005 | 79 | spin_unlock_bh(&fastmap_lock); |
1da177e4 LT |
80 | } |
81 | ||
cc7ec456 | 82 | static void |
1da177e4 LT |
83 | route4_set_fastmap(struct route4_head *head, u32 id, int iif, |
84 | struct route4_filter *f) | |
85 | { | |
86 | int h = route4_fastmap_hash(id, iif); | |
cc7ec456 | 87 | |
1109c005 JF |
88 | /* fastmap updates must look atomic to aling id, iff, filter */ |
89 | spin_lock_bh(&fastmap_lock); | |
1da177e4 LT |
90 | head->fastmap[h].id = id; |
91 | head->fastmap[h].iif = iif; | |
92 | head->fastmap[h].filter = f; | |
1109c005 | 93 | spin_unlock_bh(&fastmap_lock); |
1da177e4 LT |
94 | } |
95 | ||
cc7ec456 | 96 | static inline int route4_hash_to(u32 id) |
1da177e4 | 97 | { |
cc7ec456 | 98 | return id & 0xFF; |
1da177e4 LT |
99 | } |
100 | ||
cc7ec456 | 101 | static inline int route4_hash_from(u32 id) |
1da177e4 | 102 | { |
cc7ec456 | 103 | return (id >> 16) & 0xF; |
1da177e4 LT |
104 | } |
105 | ||
cc7ec456 | 106 | static inline int route4_hash_iif(int iif) |
1da177e4 | 107 | { |
cc7ec456 | 108 | return 16 + ((iif >> 16) & 0xF); |
1da177e4 LT |
109 | } |
110 | ||
cc7ec456 | 111 | static inline int route4_hash_wild(void) |
1da177e4 LT |
112 | { |
113 | return 32; | |
114 | } | |
115 | ||
116 | #define ROUTE4_APPLY_RESULT() \ | |
117 | { \ | |
118 | *res = f->res; \ | |
6fc6d06e | 119 | if (tcf_exts_has_actions(&f->exts)) { \ |
1da177e4 LT |
120 | int r = tcf_exts_exec(skb, &f->exts, res); \ |
121 | if (r < 0) { \ | |
122 | dont_cache = 1; \ | |
123 | continue; \ | |
124 | } \ | |
125 | return r; \ | |
126 | } else if (!dont_cache) \ | |
127 | route4_set_fastmap(head, id, iif, f); \ | |
128 | return 0; \ | |
129 | } | |
130 | ||
dc7f9f6e | 131 | static int route4_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
1da177e4 LT |
132 | struct tcf_result *res) |
133 | { | |
1109c005 | 134 | struct route4_head *head = rcu_dereference_bh(tp->root); |
1da177e4 LT |
135 | struct dst_entry *dst; |
136 | struct route4_bucket *b; | |
137 | struct route4_filter *f; | |
138 | u32 id, h; | |
139 | int iif, dont_cache = 0; | |
140 | ||
cc7ec456 ED |
141 | dst = skb_dst(skb); |
142 | if (!dst) | |
1da177e4 LT |
143 | goto failure; |
144 | ||
145 | id = dst->tclassid; | |
1da177e4 | 146 | |
92101b3b | 147 | iif = inet_iif(skb); |
1da177e4 LT |
148 | |
149 | h = route4_fastmap_hash(id, iif); | |
1109c005 JF |
150 | |
151 | spin_lock(&fastmap_lock); | |
1da177e4 LT |
152 | if (id == head->fastmap[h].id && |
153 | iif == head->fastmap[h].iif && | |
154 | (f = head->fastmap[h].filter) != NULL) { | |
1109c005 JF |
155 | if (f == ROUTE4_FAILURE) { |
156 | spin_unlock(&fastmap_lock); | |
1da177e4 | 157 | goto failure; |
1109c005 | 158 | } |
1da177e4 LT |
159 | |
160 | *res = f->res; | |
1109c005 | 161 | spin_unlock(&fastmap_lock); |
1da177e4 LT |
162 | return 0; |
163 | } | |
1109c005 | 164 | spin_unlock(&fastmap_lock); |
1da177e4 LT |
165 | |
166 | h = route4_hash_to(id); | |
167 | ||
168 | restart: | |
1109c005 | 169 | b = rcu_dereference_bh(head->table[h]); |
cc7ec456 | 170 | if (b) { |
1109c005 JF |
171 | for (f = rcu_dereference_bh(b->ht[route4_hash_from(id)]); |
172 | f; | |
173 | f = rcu_dereference_bh(f->next)) | |
1da177e4 LT |
174 | if (f->id == id) |
175 | ROUTE4_APPLY_RESULT(); | |
176 | ||
1109c005 JF |
177 | for (f = rcu_dereference_bh(b->ht[route4_hash_iif(iif)]); |
178 | f; | |
179 | f = rcu_dereference_bh(f->next)) | |
1da177e4 LT |
180 | if (f->iif == iif) |
181 | ROUTE4_APPLY_RESULT(); | |
182 | ||
1109c005 JF |
183 | for (f = rcu_dereference_bh(b->ht[route4_hash_wild()]); |
184 | f; | |
185 | f = rcu_dereference_bh(f->next)) | |
1da177e4 | 186 | ROUTE4_APPLY_RESULT(); |
1da177e4 LT |
187 | } |
188 | if (h < 256) { | |
189 | h = 256; | |
190 | id &= ~0xFFFF; | |
191 | goto restart; | |
192 | } | |
193 | ||
194 | if (!dont_cache) | |
195 | route4_set_fastmap(head, id, iif, ROUTE4_FAILURE); | |
196 | failure: | |
197 | return -1; | |
1da177e4 LT |
198 | } |
199 | ||
200 | static inline u32 to_hash(u32 id) | |
201 | { | |
cc7ec456 ED |
202 | u32 h = id & 0xFF; |
203 | ||
204 | if (id & 0x8000) | |
1da177e4 LT |
205 | h += 256; |
206 | return h; | |
207 | } | |
208 | ||
209 | static inline u32 from_hash(u32 id) | |
210 | { | |
211 | id &= 0xFFFF; | |
212 | if (id == 0xFFFF) | |
213 | return 32; | |
214 | if (!(id & 0x8000)) { | |
215 | if (id > 255) | |
216 | return 256; | |
cc7ec456 | 217 | return id & 0xF; |
1da177e4 | 218 | } |
cc7ec456 | 219 | return 16 + (id & 0xF); |
1da177e4 LT |
220 | } |
221 | ||
8113c095 | 222 | static void *route4_get(struct tcf_proto *tp, u32 handle) |
1da177e4 | 223 | { |
1109c005 | 224 | struct route4_head *head = rtnl_dereference(tp->root); |
1da177e4 LT |
225 | struct route4_bucket *b; |
226 | struct route4_filter *f; | |
cc7ec456 | 227 | unsigned int h1, h2; |
1da177e4 | 228 | |
1da177e4 LT |
229 | h1 = to_hash(handle); |
230 | if (h1 > 256) | |
8113c095 | 231 | return NULL; |
1da177e4 | 232 | |
cc7ec456 | 233 | h2 = from_hash(handle >> 16); |
1da177e4 | 234 | if (h2 > 32) |
8113c095 | 235 | return NULL; |
1da177e4 | 236 | |
1109c005 | 237 | b = rtnl_dereference(head->table[h1]); |
cc7ec456 | 238 | if (b) { |
1109c005 JF |
239 | for (f = rtnl_dereference(b->ht[h2]); |
240 | f; | |
241 | f = rtnl_dereference(f->next)) | |
1da177e4 | 242 | if (f->handle == handle) |
8113c095 | 243 | return f; |
1da177e4 | 244 | } |
8113c095 | 245 | return NULL; |
1da177e4 LT |
246 | } |
247 | ||
1da177e4 LT |
248 | static int route4_init(struct tcf_proto *tp) |
249 | { | |
a05c2d11 WC |
250 | struct route4_head *head; |
251 | ||
252 | head = kzalloc(sizeof(struct route4_head), GFP_KERNEL); | |
253 | if (head == NULL) | |
254 | return -ENOBUFS; | |
255 | ||
256 | rcu_assign_pointer(tp->root, head); | |
1da177e4 LT |
257 | return 0; |
258 | } | |
259 | ||
3fd51de5 CW |
260 | static void __route4_delete_filter(struct route4_filter *f) |
261 | { | |
262 | tcf_exts_destroy(&f->exts); | |
263 | tcf_exts_put_net(&f->exts); | |
264 | kfree(f); | |
265 | } | |
266 | ||
c2f3f31d | 267 | static void route4_delete_filter_work(struct work_struct *work) |
1da177e4 | 268 | { |
c2f3f31d | 269 | struct route4_filter *f = container_of(work, struct route4_filter, work); |
1109c005 | 270 | |
c2f3f31d | 271 | rtnl_lock(); |
3fd51de5 | 272 | __route4_delete_filter(f); |
c2f3f31d CW |
273 | rtnl_unlock(); |
274 | } | |
275 | ||
276 | static void route4_delete_filter(struct rcu_head *head) | |
277 | { | |
278 | struct route4_filter *f = container_of(head, struct route4_filter, rcu); | |
279 | ||
280 | INIT_WORK(&f->work, route4_delete_filter_work); | |
281 | tcf_queue_work(&f->work); | |
1da177e4 LT |
282 | } |
283 | ||
763dbf63 | 284 | static void route4_destroy(struct tcf_proto *tp) |
1da177e4 | 285 | { |
1109c005 | 286 | struct route4_head *head = rtnl_dereference(tp->root); |
1da177e4 LT |
287 | int h1, h2; |
288 | ||
289 | if (head == NULL) | |
763dbf63 | 290 | return; |
1da177e4 | 291 | |
cc7ec456 | 292 | for (h1 = 0; h1 <= 256; h1++) { |
1da177e4 LT |
293 | struct route4_bucket *b; |
294 | ||
1109c005 | 295 | b = rtnl_dereference(head->table[h1]); |
cc7ec456 ED |
296 | if (b) { |
297 | for (h2 = 0; h2 <= 32; h2++) { | |
1da177e4 LT |
298 | struct route4_filter *f; |
299 | ||
1109c005 JF |
300 | while ((f = rtnl_dereference(b->ht[h2])) != NULL) { |
301 | struct route4_filter *next; | |
302 | ||
303 | next = rtnl_dereference(f->next); | |
304 | RCU_INIT_POINTER(b->ht[h2], next); | |
18cdb37e | 305 | tcf_unbind_filter(tp, &f->res); |
3fd51de5 CW |
306 | if (tcf_exts_get_net(&f->exts)) |
307 | call_rcu(&f->rcu, route4_delete_filter); | |
308 | else | |
309 | __route4_delete_filter(f); | |
1da177e4 LT |
310 | } |
311 | } | |
1109c005 JF |
312 | RCU_INIT_POINTER(head->table[h1], NULL); |
313 | kfree_rcu(b, rcu); | |
1da177e4 LT |
314 | } |
315 | } | |
1109c005 | 316 | kfree_rcu(head, rcu); |
1da177e4 LT |
317 | } |
318 | ||
8113c095 | 319 | static int route4_delete(struct tcf_proto *tp, void *arg, bool *last) |
1da177e4 | 320 | { |
1109c005 | 321 | struct route4_head *head = rtnl_dereference(tp->root); |
8113c095 | 322 | struct route4_filter *f = arg; |
1109c005 JF |
323 | struct route4_filter __rcu **fp; |
324 | struct route4_filter *nf; | |
1da177e4 | 325 | struct route4_bucket *b; |
1109c005 | 326 | unsigned int h = 0; |
763dbf63 | 327 | int i, h1; |
1da177e4 LT |
328 | |
329 | if (!head || !f) | |
330 | return -EINVAL; | |
331 | ||
332 | h = f->handle; | |
333 | b = f->bkt; | |
334 | ||
1109c005 JF |
335 | fp = &b->ht[from_hash(h >> 16)]; |
336 | for (nf = rtnl_dereference(*fp); nf; | |
337 | fp = &nf->next, nf = rtnl_dereference(*fp)) { | |
338 | if (nf == f) { | |
339 | /* unlink it */ | |
340 | RCU_INIT_POINTER(*fp, rtnl_dereference(f->next)); | |
1da177e4 | 341 | |
1109c005 JF |
342 | /* Remove any fastmap lookups that might ref filter |
343 | * notice we unlink'd the filter so we can't get it | |
344 | * back in the fastmap. | |
345 | */ | |
346 | route4_reset_fastmap(head); | |
1da177e4 | 347 | |
1109c005 | 348 | /* Delete it */ |
18cdb37e | 349 | tcf_unbind_filter(tp, &f->res); |
3fd51de5 | 350 | tcf_exts_get_net(&f->exts); |
1109c005 | 351 | call_rcu(&f->rcu, route4_delete_filter); |
1da177e4 | 352 | |
1109c005 JF |
353 | /* Strip RTNL protected tree */ |
354 | for (i = 0; i <= 32; i++) { | |
355 | struct route4_filter *rt; | |
356 | ||
357 | rt = rtnl_dereference(b->ht[i]); | |
358 | if (rt) | |
763dbf63 | 359 | goto out; |
1109c005 | 360 | } |
1da177e4 LT |
361 | |
362 | /* OK, session has no flows */ | |
1109c005 JF |
363 | RCU_INIT_POINTER(head->table[to_hash(h)], NULL); |
364 | kfree_rcu(b, rcu); | |
763dbf63 WC |
365 | break; |
366 | } | |
367 | } | |
1da177e4 | 368 | |
763dbf63 WC |
369 | out: |
370 | *last = true; | |
371 | for (h1 = 0; h1 <= 256; h1++) { | |
372 | if (rcu_access_pointer(head->table[h1])) { | |
373 | *last = false; | |
374 | break; | |
1da177e4 LT |
375 | } |
376 | } | |
763dbf63 | 377 | |
1da177e4 LT |
378 | return 0; |
379 | } | |
380 | ||
6fa8c014 PM |
381 | static const struct nla_policy route4_policy[TCA_ROUTE4_MAX + 1] = { |
382 | [TCA_ROUTE4_CLASSID] = { .type = NLA_U32 }, | |
383 | [TCA_ROUTE4_TO] = { .type = NLA_U32 }, | |
384 | [TCA_ROUTE4_FROM] = { .type = NLA_U32 }, | |
385 | [TCA_ROUTE4_IIF] = { .type = NLA_U32 }, | |
386 | }; | |
387 | ||
c1b52739 BL |
388 | static int route4_set_parms(struct net *net, struct tcf_proto *tp, |
389 | unsigned long base, struct route4_filter *f, | |
390 | u32 handle, struct route4_head *head, | |
2f7ef2f8 CW |
391 | struct nlattr **tb, struct nlattr *est, int new, |
392 | bool ovr) | |
1da177e4 | 393 | { |
1da177e4 LT |
394 | u32 id = 0, to = 0, nhandle = 0x8000; |
395 | struct route4_filter *fp; | |
396 | unsigned int h1; | |
397 | struct route4_bucket *b; | |
b9a24bb7 | 398 | int err; |
1da177e4 | 399 | |
8c98d571 | 400 | err = tcf_exts_validate(net, tp, tb, est, &f->exts, ovr); |
1da177e4 LT |
401 | if (err < 0) |
402 | return err; | |
403 | ||
add93b61 | 404 | if (tb[TCA_ROUTE4_TO]) { |
1da177e4 | 405 | if (new && handle & 0x8000) |
8c98d571 | 406 | return -EINVAL; |
1587bac4 | 407 | to = nla_get_u32(tb[TCA_ROUTE4_TO]); |
1da177e4 | 408 | if (to > 0xFF) |
8c98d571 | 409 | return -EINVAL; |
1da177e4 LT |
410 | nhandle = to; |
411 | } | |
412 | ||
add93b61 PM |
413 | if (tb[TCA_ROUTE4_FROM]) { |
414 | if (tb[TCA_ROUTE4_IIF]) | |
8c98d571 | 415 | return -EINVAL; |
1587bac4 | 416 | id = nla_get_u32(tb[TCA_ROUTE4_FROM]); |
1da177e4 | 417 | if (id > 0xFF) |
8c98d571 | 418 | return -EINVAL; |
1da177e4 | 419 | nhandle |= id << 16; |
add93b61 | 420 | } else if (tb[TCA_ROUTE4_IIF]) { |
1587bac4 | 421 | id = nla_get_u32(tb[TCA_ROUTE4_IIF]); |
1da177e4 | 422 | if (id > 0x7FFF) |
8c98d571 | 423 | return -EINVAL; |
1da177e4 LT |
424 | nhandle |= (id | 0x8000) << 16; |
425 | } else | |
426 | nhandle |= 0xFFFF << 16; | |
427 | ||
428 | if (handle && new) { | |
429 | nhandle |= handle & 0x7F00; | |
430 | if (nhandle != handle) | |
8c98d571 | 431 | return -EINVAL; |
1da177e4 LT |
432 | } |
433 | ||
434 | h1 = to_hash(nhandle); | |
1109c005 | 435 | b = rtnl_dereference(head->table[h1]); |
cc7ec456 | 436 | if (!b) { |
0da974f4 | 437 | b = kzalloc(sizeof(struct route4_bucket), GFP_KERNEL); |
1da177e4 | 438 | if (b == NULL) |
8c98d571 | 439 | return -ENOBUFS; |
1da177e4 | 440 | |
1109c005 | 441 | rcu_assign_pointer(head->table[h1], b); |
1da177e4 LT |
442 | } else { |
443 | unsigned int h2 = from_hash(nhandle >> 16); | |
cc7ec456 | 444 | |
1109c005 JF |
445 | for (fp = rtnl_dereference(b->ht[h2]); |
446 | fp; | |
447 | fp = rtnl_dereference(fp->next)) | |
1da177e4 | 448 | if (fp->handle == f->handle) |
8c98d571 | 449 | return -EEXIST; |
1da177e4 LT |
450 | } |
451 | ||
add93b61 | 452 | if (tb[TCA_ROUTE4_TO]) |
1da177e4 LT |
453 | f->id = to; |
454 | ||
add93b61 | 455 | if (tb[TCA_ROUTE4_FROM]) |
1da177e4 | 456 | f->id = to | id<<16; |
add93b61 | 457 | else if (tb[TCA_ROUTE4_IIF]) |
1da177e4 LT |
458 | f->iif = id; |
459 | ||
460 | f->handle = nhandle; | |
461 | f->bkt = b; | |
1109c005 | 462 | f->tp = tp; |
1da177e4 | 463 | |
add93b61 | 464 | if (tb[TCA_ROUTE4_CLASSID]) { |
1587bac4 | 465 | f->res.classid = nla_get_u32(tb[TCA_ROUTE4_CLASSID]); |
1da177e4 LT |
466 | tcf_bind_filter(tp, &f->res, base); |
467 | } | |
468 | ||
1da177e4 | 469 | return 0; |
1da177e4 LT |
470 | } |
471 | ||
c1b52739 | 472 | static int route4_change(struct net *net, struct sk_buff *in_skb, |
5a7a5555 | 473 | struct tcf_proto *tp, unsigned long base, u32 handle, |
8113c095 | 474 | struct nlattr **tca, void **arg, bool ovr) |
1da177e4 | 475 | { |
1109c005 JF |
476 | struct route4_head *head = rtnl_dereference(tp->root); |
477 | struct route4_filter __rcu **fp; | |
478 | struct route4_filter *fold, *f1, *pfp, *f = NULL; | |
1da177e4 | 479 | struct route4_bucket *b; |
add93b61 PM |
480 | struct nlattr *opt = tca[TCA_OPTIONS]; |
481 | struct nlattr *tb[TCA_ROUTE4_MAX + 1]; | |
1da177e4 | 482 | unsigned int h, th; |
1da177e4 | 483 | int err; |
1109c005 | 484 | bool new = true; |
1da177e4 LT |
485 | |
486 | if (opt == NULL) | |
487 | return handle ? -EINVAL : 0; | |
488 | ||
fceb6435 | 489 | err = nla_parse_nested(tb, TCA_ROUTE4_MAX, opt, route4_policy, NULL); |
cee63723 PM |
490 | if (err < 0) |
491 | return err; | |
1da177e4 | 492 | |
8113c095 | 493 | fold = *arg; |
1109c005 | 494 | if (fold && handle && fold->handle != handle) |
1da177e4 LT |
495 | return -EINVAL; |
496 | ||
1da177e4 | 497 | err = -ENOBUFS; |
0da974f4 | 498 | f = kzalloc(sizeof(struct route4_filter), GFP_KERNEL); |
1109c005 | 499 | if (!f) |
1da177e4 | 500 | goto errout; |
1da177e4 | 501 | |
b9a24bb7 WC |
502 | err = tcf_exts_init(&f->exts, TCA_ROUTE4_ACT, TCA_ROUTE4_POLICE); |
503 | if (err < 0) | |
504 | goto errout; | |
505 | ||
1109c005 JF |
506 | if (fold) { |
507 | f->id = fold->id; | |
508 | f->iif = fold->iif; | |
509 | f->res = fold->res; | |
510 | f->handle = fold->handle; | |
511 | ||
512 | f->tp = fold->tp; | |
513 | f->bkt = fold->bkt; | |
514 | new = false; | |
515 | } | |
516 | ||
c1b52739 | 517 | err = route4_set_parms(net, tp, base, f, handle, head, tb, |
1109c005 | 518 | tca[TCA_RATE], new, ovr); |
1da177e4 LT |
519 | if (err < 0) |
520 | goto errout; | |
521 | ||
1da177e4 | 522 | h = from_hash(f->handle >> 16); |
1109c005 JF |
523 | fp = &f->bkt->ht[h]; |
524 | for (pfp = rtnl_dereference(*fp); | |
525 | (f1 = rtnl_dereference(*fp)) != NULL; | |
526 | fp = &f1->next) | |
1da177e4 LT |
527 | if (f->handle < f1->handle) |
528 | break; | |
529 | ||
02875878 | 530 | netif_keep_dst(qdisc_dev(tp->q)); |
1109c005 JF |
531 | rcu_assign_pointer(f->next, f1); |
532 | rcu_assign_pointer(*fp, f); | |
1da177e4 | 533 | |
1109c005 JF |
534 | if (fold && fold->handle && f->handle != fold->handle) { |
535 | th = to_hash(fold->handle); | |
536 | h = from_hash(fold->handle >> 16); | |
537 | b = rtnl_dereference(head->table[th]); | |
cc7ec456 | 538 | if (b) { |
1109c005 JF |
539 | fp = &b->ht[h]; |
540 | for (pfp = rtnl_dereference(*fp); pfp; | |
541 | fp = &pfp->next, pfp = rtnl_dereference(*fp)) { | |
542 | if (pfp == f) { | |
1da177e4 LT |
543 | *fp = f->next; |
544 | break; | |
545 | } | |
546 | } | |
547 | } | |
548 | } | |
1da177e4 | 549 | |
1109c005 | 550 | route4_reset_fastmap(head); |
8113c095 | 551 | *arg = f; |
18cdb37e JF |
552 | if (fold) { |
553 | tcf_unbind_filter(tp, &fold->res); | |
3fd51de5 | 554 | tcf_exts_get_net(&fold->exts); |
1109c005 | 555 | call_rcu(&fold->rcu, route4_delete_filter); |
18cdb37e | 556 | } |
1da177e4 LT |
557 | return 0; |
558 | ||
559 | errout: | |
21641c2e WC |
560 | if (f) |
561 | tcf_exts_destroy(&f->exts); | |
a51482bd | 562 | kfree(f); |
1da177e4 LT |
563 | return err; |
564 | } | |
565 | ||
566 | static void route4_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
567 | { | |
1109c005 | 568 | struct route4_head *head = rtnl_dereference(tp->root); |
cc7ec456 | 569 | unsigned int h, h1; |
1da177e4 LT |
570 | |
571 | if (head == NULL) | |
572 | arg->stop = 1; | |
573 | ||
574 | if (arg->stop) | |
575 | return; | |
576 | ||
577 | for (h = 0; h <= 256; h++) { | |
1109c005 | 578 | struct route4_bucket *b = rtnl_dereference(head->table[h]); |
1da177e4 LT |
579 | |
580 | if (b) { | |
581 | for (h1 = 0; h1 <= 32; h1++) { | |
582 | struct route4_filter *f; | |
583 | ||
1109c005 JF |
584 | for (f = rtnl_dereference(b->ht[h1]); |
585 | f; | |
586 | f = rtnl_dereference(f->next)) { | |
1da177e4 LT |
587 | if (arg->count < arg->skip) { |
588 | arg->count++; | |
589 | continue; | |
590 | } | |
8113c095 | 591 | if (arg->fn(tp, f, arg) < 0) { |
1da177e4 LT |
592 | arg->stop = 1; |
593 | return; | |
594 | } | |
595 | arg->count++; | |
596 | } | |
597 | } | |
598 | } | |
599 | } | |
600 | } | |
601 | ||
8113c095 | 602 | static int route4_dump(struct net *net, struct tcf_proto *tp, void *fh, |
1da177e4 LT |
603 | struct sk_buff *skb, struct tcmsg *t) |
604 | { | |
8113c095 | 605 | struct route4_filter *f = fh; |
4b3550ef | 606 | struct nlattr *nest; |
1da177e4 LT |
607 | u32 id; |
608 | ||
609 | if (f == NULL) | |
610 | return skb->len; | |
611 | ||
612 | t->tcm_handle = f->handle; | |
613 | ||
4b3550ef PM |
614 | nest = nla_nest_start(skb, TCA_OPTIONS); |
615 | if (nest == NULL) | |
616 | goto nla_put_failure; | |
1da177e4 | 617 | |
cc7ec456 ED |
618 | if (!(f->handle & 0x8000)) { |
619 | id = f->id & 0xFF; | |
1b34ec43 DM |
620 | if (nla_put_u32(skb, TCA_ROUTE4_TO, id)) |
621 | goto nla_put_failure; | |
1da177e4 | 622 | } |
cc7ec456 | 623 | if (f->handle & 0x80000000) { |
1b34ec43 DM |
624 | if ((f->handle >> 16) != 0xFFFF && |
625 | nla_put_u32(skb, TCA_ROUTE4_IIF, f->iif)) | |
626 | goto nla_put_failure; | |
1da177e4 | 627 | } else { |
cc7ec456 | 628 | id = f->id >> 16; |
1b34ec43 DM |
629 | if (nla_put_u32(skb, TCA_ROUTE4_FROM, id)) |
630 | goto nla_put_failure; | |
1da177e4 | 631 | } |
1b34ec43 DM |
632 | if (f->res.classid && |
633 | nla_put_u32(skb, TCA_ROUTE4_CLASSID, f->res.classid)) | |
634 | goto nla_put_failure; | |
1da177e4 | 635 | |
5da57f42 | 636 | if (tcf_exts_dump(skb, &f->exts) < 0) |
add93b61 | 637 | goto nla_put_failure; |
1da177e4 | 638 | |
4b3550ef | 639 | nla_nest_end(skb, nest); |
1da177e4 | 640 | |
5da57f42 | 641 | if (tcf_exts_dump_stats(skb, &f->exts) < 0) |
add93b61 | 642 | goto nla_put_failure; |
1da177e4 LT |
643 | |
644 | return skb->len; | |
645 | ||
add93b61 | 646 | nla_put_failure: |
6ea3b446 | 647 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
648 | return -1; |
649 | } | |
650 | ||
07d79fc7 CW |
651 | static void route4_bind_class(void *fh, u32 classid, unsigned long cl) |
652 | { | |
653 | struct route4_filter *f = fh; | |
654 | ||
655 | if (f && f->res.classid == classid) | |
656 | f->res.class = cl; | |
657 | } | |
658 | ||
2eb9d75c | 659 | static struct tcf_proto_ops cls_route4_ops __read_mostly = { |
1da177e4 LT |
660 | .kind = "route", |
661 | .classify = route4_classify, | |
662 | .init = route4_init, | |
663 | .destroy = route4_destroy, | |
664 | .get = route4_get, | |
1da177e4 LT |
665 | .change = route4_change, |
666 | .delete = route4_delete, | |
667 | .walk = route4_walk, | |
668 | .dump = route4_dump, | |
07d79fc7 | 669 | .bind_class = route4_bind_class, |
1da177e4 LT |
670 | .owner = THIS_MODULE, |
671 | }; | |
672 | ||
673 | static int __init init_route4(void) | |
674 | { | |
675 | return register_tcf_proto_ops(&cls_route4_ops); | |
676 | } | |
677 | ||
678 | static void __exit exit_route4(void) | |
679 | { | |
680 | unregister_tcf_proto_ops(&cls_route4_ops); | |
681 | } | |
682 | ||
683 | module_init(init_route4) | |
684 | module_exit(exit_route4) | |
685 | MODULE_LICENSE("GPL"); |