Commit | Line | Data |
---|---|---|
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 JF |
59 | struct tcf_proto *tp; |
60 | struct rcu_head rcu; | |
1da177e4 LT |
61 | }; |
62 | ||
cc7ec456 | 63 | #define ROUTE4_FAILURE ((struct route4_filter *)(-1L)) |
1da177e4 | 64 | |
cc7ec456 | 65 | static inline int route4_fastmap_hash(u32 id, int iif) |
1da177e4 | 66 | { |
cc7ec456 | 67 | return id & 0xF; |
1da177e4 LT |
68 | } |
69 | ||
1109c005 | 70 | static DEFINE_SPINLOCK(fastmap_lock); |
cc7ec456 | 71 | static void |
1109c005 | 72 | route4_reset_fastmap(struct route4_head *head) |
1da177e4 | 73 | { |
1109c005 | 74 | spin_lock_bh(&fastmap_lock); |
1da177e4 | 75 | memset(head->fastmap, 0, sizeof(head->fastmap)); |
1109c005 | 76 | spin_unlock_bh(&fastmap_lock); |
1da177e4 LT |
77 | } |
78 | ||
cc7ec456 | 79 | static void |
1da177e4 LT |
80 | route4_set_fastmap(struct route4_head *head, u32 id, int iif, |
81 | struct route4_filter *f) | |
82 | { | |
83 | int h = route4_fastmap_hash(id, iif); | |
cc7ec456 | 84 | |
1109c005 JF |
85 | /* fastmap updates must look atomic to aling id, iff, filter */ |
86 | spin_lock_bh(&fastmap_lock); | |
1da177e4 LT |
87 | head->fastmap[h].id = id; |
88 | head->fastmap[h].iif = iif; | |
89 | head->fastmap[h].filter = f; | |
1109c005 | 90 | spin_unlock_bh(&fastmap_lock); |
1da177e4 LT |
91 | } |
92 | ||
cc7ec456 | 93 | static inline int route4_hash_to(u32 id) |
1da177e4 | 94 | { |
cc7ec456 | 95 | return id & 0xFF; |
1da177e4 LT |
96 | } |
97 | ||
cc7ec456 | 98 | static inline int route4_hash_from(u32 id) |
1da177e4 | 99 | { |
cc7ec456 | 100 | return (id >> 16) & 0xF; |
1da177e4 LT |
101 | } |
102 | ||
cc7ec456 | 103 | static inline int route4_hash_iif(int iif) |
1da177e4 | 104 | { |
cc7ec456 | 105 | return 16 + ((iif >> 16) & 0xF); |
1da177e4 LT |
106 | } |
107 | ||
cc7ec456 | 108 | static inline int route4_hash_wild(void) |
1da177e4 LT |
109 | { |
110 | return 32; | |
111 | } | |
112 | ||
113 | #define ROUTE4_APPLY_RESULT() \ | |
114 | { \ | |
115 | *res = f->res; \ | |
116 | if (tcf_exts_is_available(&f->exts)) { \ | |
117 | int r = tcf_exts_exec(skb, &f->exts, res); \ | |
118 | if (r < 0) { \ | |
119 | dont_cache = 1; \ | |
120 | continue; \ | |
121 | } \ | |
122 | return r; \ | |
123 | } else if (!dont_cache) \ | |
124 | route4_set_fastmap(head, id, iif, f); \ | |
125 | return 0; \ | |
126 | } | |
127 | ||
dc7f9f6e | 128 | static int route4_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
1da177e4 LT |
129 | struct tcf_result *res) |
130 | { | |
1109c005 | 131 | struct route4_head *head = rcu_dereference_bh(tp->root); |
1da177e4 LT |
132 | struct dst_entry *dst; |
133 | struct route4_bucket *b; | |
134 | struct route4_filter *f; | |
135 | u32 id, h; | |
136 | int iif, dont_cache = 0; | |
137 | ||
cc7ec456 ED |
138 | dst = skb_dst(skb); |
139 | if (!dst) | |
1da177e4 LT |
140 | goto failure; |
141 | ||
142 | id = dst->tclassid; | |
143 | if (head == NULL) | |
144 | goto old_method; | |
145 | ||
92101b3b | 146 | iif = inet_iif(skb); |
1da177e4 LT |
147 | |
148 | h = route4_fastmap_hash(id, iif); | |
1109c005 JF |
149 | |
150 | spin_lock(&fastmap_lock); | |
1da177e4 LT |
151 | if (id == head->fastmap[h].id && |
152 | iif == head->fastmap[h].iif && | |
153 | (f = head->fastmap[h].filter) != NULL) { | |
1109c005 JF |
154 | if (f == ROUTE4_FAILURE) { |
155 | spin_unlock(&fastmap_lock); | |
1da177e4 | 156 | goto failure; |
1109c005 | 157 | } |
1da177e4 LT |
158 | |
159 | *res = f->res; | |
1109c005 | 160 | spin_unlock(&fastmap_lock); |
1da177e4 LT |
161 | return 0; |
162 | } | |
1109c005 | 163 | spin_unlock(&fastmap_lock); |
1da177e4 LT |
164 | |
165 | h = route4_hash_to(id); | |
166 | ||
167 | restart: | |
1109c005 | 168 | b = rcu_dereference_bh(head->table[h]); |
cc7ec456 | 169 | if (b) { |
1109c005 JF |
170 | for (f = rcu_dereference_bh(b->ht[route4_hash_from(id)]); |
171 | f; | |
172 | f = rcu_dereference_bh(f->next)) | |
1da177e4 LT |
173 | if (f->id == id) |
174 | ROUTE4_APPLY_RESULT(); | |
175 | ||
1109c005 JF |
176 | for (f = rcu_dereference_bh(b->ht[route4_hash_iif(iif)]); |
177 | f; | |
178 | f = rcu_dereference_bh(f->next)) | |
1da177e4 LT |
179 | if (f->iif == iif) |
180 | ROUTE4_APPLY_RESULT(); | |
181 | ||
1109c005 JF |
182 | for (f = rcu_dereference_bh(b->ht[route4_hash_wild()]); |
183 | f; | |
184 | f = rcu_dereference_bh(f->next)) | |
1da177e4 | 185 | ROUTE4_APPLY_RESULT(); |
1da177e4 LT |
186 | } |
187 | if (h < 256) { | |
188 | h = 256; | |
189 | id &= ~0xFFFF; | |
190 | goto restart; | |
191 | } | |
192 | ||
193 | if (!dont_cache) | |
194 | route4_set_fastmap(head, id, iif, ROUTE4_FAILURE); | |
195 | failure: | |
196 | return -1; | |
197 | ||
198 | old_method: | |
199 | if (id && (TC_H_MAJ(id) == 0 || | |
200 | !(TC_H_MAJ(id^tp->q->handle)))) { | |
201 | res->classid = id; | |
202 | res->class = 0; | |
203 | return 0; | |
204 | } | |
205 | return -1; | |
206 | } | |
207 | ||
208 | static inline u32 to_hash(u32 id) | |
209 | { | |
cc7ec456 ED |
210 | u32 h = id & 0xFF; |
211 | ||
212 | if (id & 0x8000) | |
1da177e4 LT |
213 | h += 256; |
214 | return h; | |
215 | } | |
216 | ||
217 | static inline u32 from_hash(u32 id) | |
218 | { | |
219 | id &= 0xFFFF; | |
220 | if (id == 0xFFFF) | |
221 | return 32; | |
222 | if (!(id & 0x8000)) { | |
223 | if (id > 255) | |
224 | return 256; | |
cc7ec456 | 225 | return id & 0xF; |
1da177e4 | 226 | } |
cc7ec456 | 227 | return 16 + (id & 0xF); |
1da177e4 LT |
228 | } |
229 | ||
230 | static unsigned long route4_get(struct tcf_proto *tp, u32 handle) | |
231 | { | |
1109c005 | 232 | struct route4_head *head = rtnl_dereference(tp->root); |
1da177e4 LT |
233 | struct route4_bucket *b; |
234 | struct route4_filter *f; | |
cc7ec456 | 235 | unsigned int h1, h2; |
1da177e4 LT |
236 | |
237 | if (!head) | |
238 | return 0; | |
239 | ||
240 | h1 = to_hash(handle); | |
241 | if (h1 > 256) | |
242 | return 0; | |
243 | ||
cc7ec456 | 244 | h2 = from_hash(handle >> 16); |
1da177e4 LT |
245 | if (h2 > 32) |
246 | return 0; | |
247 | ||
1109c005 | 248 | b = rtnl_dereference(head->table[h1]); |
cc7ec456 | 249 | if (b) { |
1109c005 JF |
250 | for (f = rtnl_dereference(b->ht[h2]); |
251 | f; | |
252 | f = rtnl_dereference(f->next)) | |
1da177e4 LT |
253 | if (f->handle == handle) |
254 | return (unsigned long)f; | |
255 | } | |
256 | return 0; | |
257 | } | |
258 | ||
1da177e4 LT |
259 | static int route4_init(struct tcf_proto *tp) |
260 | { | |
a05c2d11 WC |
261 | struct route4_head *head; |
262 | ||
263 | head = kzalloc(sizeof(struct route4_head), GFP_KERNEL); | |
264 | if (head == NULL) | |
265 | return -ENOBUFS; | |
266 | ||
267 | rcu_assign_pointer(tp->root, head); | |
1da177e4 LT |
268 | return 0; |
269 | } | |
270 | ||
cc7ec456 | 271 | static void |
1109c005 | 272 | route4_delete_filter(struct rcu_head *head) |
1da177e4 | 273 | { |
1109c005 | 274 | struct route4_filter *f = container_of(head, struct route4_filter, rcu); |
1109c005 | 275 | |
18d0264f | 276 | tcf_exts_destroy(&f->exts); |
1da177e4 LT |
277 | kfree(f); |
278 | } | |
279 | ||
1e052be6 | 280 | static bool route4_destroy(struct tcf_proto *tp, bool force) |
1da177e4 | 281 | { |
1109c005 | 282 | struct route4_head *head = rtnl_dereference(tp->root); |
1da177e4 LT |
283 | int h1, h2; |
284 | ||
285 | if (head == NULL) | |
1e052be6 CW |
286 | return true; |
287 | ||
288 | if (!force) { | |
289 | for (h1 = 0; h1 <= 256; h1++) { | |
290 | if (rcu_access_pointer(head->table[h1])) | |
291 | return false; | |
292 | } | |
293 | } | |
1da177e4 | 294 | |
cc7ec456 | 295 | for (h1 = 0; h1 <= 256; h1++) { |
1da177e4 LT |
296 | struct route4_bucket *b; |
297 | ||
1109c005 | 298 | b = rtnl_dereference(head->table[h1]); |
cc7ec456 ED |
299 | if (b) { |
300 | for (h2 = 0; h2 <= 32; h2++) { | |
1da177e4 LT |
301 | struct route4_filter *f; |
302 | ||
1109c005 JF |
303 | while ((f = rtnl_dereference(b->ht[h2])) != NULL) { |
304 | struct route4_filter *next; | |
305 | ||
306 | next = rtnl_dereference(f->next); | |
307 | RCU_INIT_POINTER(b->ht[h2], next); | |
18cdb37e | 308 | tcf_unbind_filter(tp, &f->res); |
1109c005 | 309 | call_rcu(&f->rcu, route4_delete_filter); |
1da177e4 LT |
310 | } |
311 | } | |
1109c005 JF |
312 | RCU_INIT_POINTER(head->table[h1], NULL); |
313 | kfree_rcu(b, rcu); | |
1da177e4 LT |
314 | } |
315 | } | |
1109c005 JF |
316 | RCU_INIT_POINTER(tp->root, NULL); |
317 | kfree_rcu(head, rcu); | |
1e052be6 | 318 | return true; |
1da177e4 LT |
319 | } |
320 | ||
321 | static int route4_delete(struct tcf_proto *tp, unsigned long arg) | |
322 | { | |
1109c005 JF |
323 | struct route4_head *head = rtnl_dereference(tp->root); |
324 | struct route4_filter *f = (struct route4_filter *)arg; | |
325 | struct route4_filter __rcu **fp; | |
326 | struct route4_filter *nf; | |
1da177e4 | 327 | struct route4_bucket *b; |
1109c005 | 328 | unsigned int h = 0; |
1da177e4 LT |
329 | int i; |
330 | ||
331 | if (!head || !f) | |
332 | return -EINVAL; | |
333 | ||
334 | h = f->handle; | |
335 | b = f->bkt; | |
336 | ||
1109c005 JF |
337 | fp = &b->ht[from_hash(h >> 16)]; |
338 | for (nf = rtnl_dereference(*fp); nf; | |
339 | fp = &nf->next, nf = rtnl_dereference(*fp)) { | |
340 | if (nf == f) { | |
341 | /* unlink it */ | |
342 | RCU_INIT_POINTER(*fp, rtnl_dereference(f->next)); | |
1da177e4 | 343 | |
1109c005 JF |
344 | /* Remove any fastmap lookups that might ref filter |
345 | * notice we unlink'd the filter so we can't get it | |
346 | * back in the fastmap. | |
347 | */ | |
348 | route4_reset_fastmap(head); | |
1da177e4 | 349 | |
1109c005 | 350 | /* Delete it */ |
18cdb37e | 351 | tcf_unbind_filter(tp, &f->res); |
1109c005 | 352 | call_rcu(&f->rcu, route4_delete_filter); |
1da177e4 | 353 | |
1109c005 JF |
354 | /* Strip RTNL protected tree */ |
355 | for (i = 0; i <= 32; i++) { | |
356 | struct route4_filter *rt; | |
357 | ||
358 | rt = rtnl_dereference(b->ht[i]); | |
359 | if (rt) | |
1da177e4 | 360 | return 0; |
1109c005 | 361 | } |
1da177e4 LT |
362 | |
363 | /* OK, session has no flows */ | |
1109c005 JF |
364 | RCU_INIT_POINTER(head->table[to_hash(h)], NULL); |
365 | kfree_rcu(b, rcu); | |
1da177e4 | 366 | |
1da177e4 LT |
367 | return 0; |
368 | } | |
369 | } | |
370 | return 0; | |
371 | } | |
372 | ||
6fa8c014 PM |
373 | static const struct nla_policy route4_policy[TCA_ROUTE4_MAX + 1] = { |
374 | [TCA_ROUTE4_CLASSID] = { .type = NLA_U32 }, | |
375 | [TCA_ROUTE4_TO] = { .type = NLA_U32 }, | |
376 | [TCA_ROUTE4_FROM] = { .type = NLA_U32 }, | |
377 | [TCA_ROUTE4_IIF] = { .type = NLA_U32 }, | |
378 | }; | |
379 | ||
c1b52739 BL |
380 | static int route4_set_parms(struct net *net, struct tcf_proto *tp, |
381 | unsigned long base, struct route4_filter *f, | |
382 | u32 handle, struct route4_head *head, | |
2f7ef2f8 CW |
383 | struct nlattr **tb, struct nlattr *est, int new, |
384 | bool ovr) | |
1da177e4 LT |
385 | { |
386 | int err; | |
387 | u32 id = 0, to = 0, nhandle = 0x8000; | |
388 | struct route4_filter *fp; | |
389 | unsigned int h1; | |
390 | struct route4_bucket *b; | |
391 | struct tcf_exts e; | |
392 | ||
5da57f42 | 393 | tcf_exts_init(&e, TCA_ROUTE4_ACT, TCA_ROUTE4_POLICE); |
2f7ef2f8 | 394 | err = tcf_exts_validate(net, tp, tb, est, &e, ovr); |
1da177e4 LT |
395 | if (err < 0) |
396 | return err; | |
397 | ||
398 | err = -EINVAL; | |
add93b61 | 399 | if (tb[TCA_ROUTE4_TO]) { |
1da177e4 LT |
400 | if (new && handle & 0x8000) |
401 | goto errout; | |
1587bac4 | 402 | to = nla_get_u32(tb[TCA_ROUTE4_TO]); |
1da177e4 LT |
403 | if (to > 0xFF) |
404 | goto errout; | |
405 | nhandle = to; | |
406 | } | |
407 | ||
add93b61 PM |
408 | if (tb[TCA_ROUTE4_FROM]) { |
409 | if (tb[TCA_ROUTE4_IIF]) | |
1da177e4 | 410 | goto errout; |
1587bac4 | 411 | id = nla_get_u32(tb[TCA_ROUTE4_FROM]); |
1da177e4 LT |
412 | if (id > 0xFF) |
413 | goto errout; | |
414 | nhandle |= id << 16; | |
add93b61 | 415 | } else if (tb[TCA_ROUTE4_IIF]) { |
1587bac4 | 416 | id = nla_get_u32(tb[TCA_ROUTE4_IIF]); |
1da177e4 LT |
417 | if (id > 0x7FFF) |
418 | goto errout; | |
419 | nhandle |= (id | 0x8000) << 16; | |
420 | } else | |
421 | nhandle |= 0xFFFF << 16; | |
422 | ||
423 | if (handle && new) { | |
424 | nhandle |= handle & 0x7F00; | |
425 | if (nhandle != handle) | |
426 | goto errout; | |
427 | } | |
428 | ||
429 | h1 = to_hash(nhandle); | |
1109c005 | 430 | b = rtnl_dereference(head->table[h1]); |
cc7ec456 | 431 | if (!b) { |
1da177e4 | 432 | err = -ENOBUFS; |
0da974f4 | 433 | b = kzalloc(sizeof(struct route4_bucket), GFP_KERNEL); |
1da177e4 LT |
434 | if (b == NULL) |
435 | goto errout; | |
1da177e4 | 436 | |
1109c005 | 437 | rcu_assign_pointer(head->table[h1], b); |
1da177e4 LT |
438 | } else { |
439 | unsigned int h2 = from_hash(nhandle >> 16); | |
cc7ec456 | 440 | |
1da177e4 | 441 | err = -EEXIST; |
1109c005 JF |
442 | for (fp = rtnl_dereference(b->ht[h2]); |
443 | fp; | |
444 | fp = rtnl_dereference(fp->next)) | |
1da177e4 LT |
445 | if (fp->handle == f->handle) |
446 | goto errout; | |
447 | } | |
448 | ||
add93b61 | 449 | if (tb[TCA_ROUTE4_TO]) |
1da177e4 LT |
450 | f->id = to; |
451 | ||
add93b61 | 452 | if (tb[TCA_ROUTE4_FROM]) |
1da177e4 | 453 | f->id = to | id<<16; |
add93b61 | 454 | else if (tb[TCA_ROUTE4_IIF]) |
1da177e4 LT |
455 | f->iif = id; |
456 | ||
457 | f->handle = nhandle; | |
458 | f->bkt = b; | |
1109c005 | 459 | f->tp = tp; |
1da177e4 | 460 | |
add93b61 | 461 | if (tb[TCA_ROUTE4_CLASSID]) { |
1587bac4 | 462 | f->res.classid = nla_get_u32(tb[TCA_ROUTE4_CLASSID]); |
1da177e4 LT |
463 | tcf_bind_filter(tp, &f->res, base); |
464 | } | |
465 | ||
466 | tcf_exts_change(tp, &f->exts, &e); | |
467 | ||
468 | return 0; | |
469 | errout: | |
18d0264f | 470 | tcf_exts_destroy(&e); |
1da177e4 LT |
471 | return err; |
472 | } | |
473 | ||
c1b52739 | 474 | static int route4_change(struct net *net, struct sk_buff *in_skb, |
af4c6641 | 475 | struct tcf_proto *tp, unsigned long base, |
1da177e4 | 476 | u32 handle, |
add93b61 | 477 | struct nlattr **tca, |
2f7ef2f8 | 478 | unsigned long *arg, bool ovr) |
1da177e4 | 479 | { |
1109c005 JF |
480 | struct route4_head *head = rtnl_dereference(tp->root); |
481 | struct route4_filter __rcu **fp; | |
482 | struct route4_filter *fold, *f1, *pfp, *f = NULL; | |
1da177e4 | 483 | struct route4_bucket *b; |
add93b61 PM |
484 | struct nlattr *opt = tca[TCA_OPTIONS]; |
485 | struct nlattr *tb[TCA_ROUTE4_MAX + 1]; | |
1da177e4 | 486 | unsigned int h, th; |
1da177e4 | 487 | int err; |
1109c005 | 488 | bool new = true; |
1da177e4 LT |
489 | |
490 | if (opt == NULL) | |
491 | return handle ? -EINVAL : 0; | |
492 | ||
6fa8c014 | 493 | err = nla_parse_nested(tb, TCA_ROUTE4_MAX, opt, route4_policy); |
cee63723 PM |
494 | if (err < 0) |
495 | return err; | |
1da177e4 | 496 | |
1109c005 JF |
497 | fold = (struct route4_filter *)*arg; |
498 | if (fold && handle && fold->handle != handle) | |
1da177e4 LT |
499 | return -EINVAL; |
500 | ||
1da177e4 | 501 | err = -ENOBUFS; |
0da974f4 | 502 | f = kzalloc(sizeof(struct route4_filter), GFP_KERNEL); |
1109c005 | 503 | if (!f) |
1da177e4 | 504 | goto errout; |
1da177e4 | 505 | |
5da57f42 | 506 | tcf_exts_init(&f->exts, TCA_ROUTE4_ACT, TCA_ROUTE4_POLICE); |
1109c005 JF |
507 | if (fold) { |
508 | f->id = fold->id; | |
509 | f->iif = fold->iif; | |
510 | f->res = fold->res; | |
511 | f->handle = fold->handle; | |
512 | ||
513 | f->tp = fold->tp; | |
514 | f->bkt = fold->bkt; | |
515 | new = false; | |
516 | } | |
517 | ||
c1b52739 | 518 | err = route4_set_parms(net, tp, base, f, handle, head, tb, |
1109c005 | 519 | tca[TCA_RATE], new, ovr); |
1da177e4 LT |
520 | if (err < 0) |
521 | goto errout; | |
522 | ||
1da177e4 | 523 | h = from_hash(f->handle >> 16); |
1109c005 JF |
524 | fp = &f->bkt->ht[h]; |
525 | for (pfp = rtnl_dereference(*fp); | |
526 | (f1 = rtnl_dereference(*fp)) != NULL; | |
527 | fp = &f1->next) | |
1da177e4 LT |
528 | if (f->handle < f1->handle) |
529 | break; | |
530 | ||
02875878 | 531 | netif_keep_dst(qdisc_dev(tp->q)); |
1109c005 JF |
532 | rcu_assign_pointer(f->next, f1); |
533 | rcu_assign_pointer(*fp, f); | |
1da177e4 | 534 | |
1109c005 JF |
535 | if (fold && fold->handle && f->handle != fold->handle) { |
536 | th = to_hash(fold->handle); | |
537 | h = from_hash(fold->handle >> 16); | |
538 | b = rtnl_dereference(head->table[th]); | |
cc7ec456 | 539 | if (b) { |
1109c005 JF |
540 | fp = &b->ht[h]; |
541 | for (pfp = rtnl_dereference(*fp); pfp; | |
542 | fp = &pfp->next, pfp = rtnl_dereference(*fp)) { | |
543 | if (pfp == f) { | |
1da177e4 LT |
544 | *fp = f->next; |
545 | break; | |
546 | } | |
547 | } | |
548 | } | |
549 | } | |
1da177e4 | 550 | |
1109c005 | 551 | route4_reset_fastmap(head); |
1da177e4 | 552 | *arg = (unsigned long)f; |
18cdb37e JF |
553 | if (fold) { |
554 | tcf_unbind_filter(tp, &fold->res); | |
1109c005 | 555 | call_rcu(&fold->rcu, route4_delete_filter); |
18cdb37e | 556 | } |
1da177e4 LT |
557 | return 0; |
558 | ||
559 | errout: | |
a51482bd | 560 | kfree(f); |
1da177e4 LT |
561 | return err; |
562 | } | |
563 | ||
564 | static void route4_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
565 | { | |
1109c005 | 566 | struct route4_head *head = rtnl_dereference(tp->root); |
cc7ec456 | 567 | unsigned int h, h1; |
1da177e4 LT |
568 | |
569 | if (head == NULL) | |
570 | arg->stop = 1; | |
571 | ||
572 | if (arg->stop) | |
573 | return; | |
574 | ||
575 | for (h = 0; h <= 256; h++) { | |
1109c005 | 576 | struct route4_bucket *b = rtnl_dereference(head->table[h]); |
1da177e4 LT |
577 | |
578 | if (b) { | |
579 | for (h1 = 0; h1 <= 32; h1++) { | |
580 | struct route4_filter *f; | |
581 | ||
1109c005 JF |
582 | for (f = rtnl_dereference(b->ht[h1]); |
583 | f; | |
584 | f = rtnl_dereference(f->next)) { | |
1da177e4 LT |
585 | if (arg->count < arg->skip) { |
586 | arg->count++; | |
587 | continue; | |
588 | } | |
589 | if (arg->fn(tp, (unsigned long)f, arg) < 0) { | |
590 | arg->stop = 1; | |
591 | return; | |
592 | } | |
593 | arg->count++; | |
594 | } | |
595 | } | |
596 | } | |
597 | } | |
598 | } | |
599 | ||
832d1d5b | 600 | static int route4_dump(struct net *net, struct tcf_proto *tp, unsigned long fh, |
1da177e4 LT |
601 | struct sk_buff *skb, struct tcmsg *t) |
602 | { | |
cc7ec456 | 603 | struct route4_filter *f = (struct route4_filter *)fh; |
4b3550ef | 604 | struct nlattr *nest; |
1da177e4 LT |
605 | u32 id; |
606 | ||
607 | if (f == NULL) | |
608 | return skb->len; | |
609 | ||
610 | t->tcm_handle = f->handle; | |
611 | ||
4b3550ef PM |
612 | nest = nla_nest_start(skb, TCA_OPTIONS); |
613 | if (nest == NULL) | |
614 | goto nla_put_failure; | |
1da177e4 | 615 | |
cc7ec456 ED |
616 | if (!(f->handle & 0x8000)) { |
617 | id = f->id & 0xFF; | |
1b34ec43 DM |
618 | if (nla_put_u32(skb, TCA_ROUTE4_TO, id)) |
619 | goto nla_put_failure; | |
1da177e4 | 620 | } |
cc7ec456 | 621 | if (f->handle & 0x80000000) { |
1b34ec43 DM |
622 | if ((f->handle >> 16) != 0xFFFF && |
623 | nla_put_u32(skb, TCA_ROUTE4_IIF, f->iif)) | |
624 | goto nla_put_failure; | |
1da177e4 | 625 | } else { |
cc7ec456 | 626 | id = f->id >> 16; |
1b34ec43 DM |
627 | if (nla_put_u32(skb, TCA_ROUTE4_FROM, id)) |
628 | goto nla_put_failure; | |
1da177e4 | 629 | } |
1b34ec43 DM |
630 | if (f->res.classid && |
631 | nla_put_u32(skb, TCA_ROUTE4_CLASSID, f->res.classid)) | |
632 | goto nla_put_failure; | |
1da177e4 | 633 | |
5da57f42 | 634 | if (tcf_exts_dump(skb, &f->exts) < 0) |
add93b61 | 635 | goto nla_put_failure; |
1da177e4 | 636 | |
4b3550ef | 637 | nla_nest_end(skb, nest); |
1da177e4 | 638 | |
5da57f42 | 639 | if (tcf_exts_dump_stats(skb, &f->exts) < 0) |
add93b61 | 640 | goto nla_put_failure; |
1da177e4 LT |
641 | |
642 | return skb->len; | |
643 | ||
add93b61 | 644 | nla_put_failure: |
6ea3b446 | 645 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
646 | return -1; |
647 | } | |
648 | ||
2eb9d75c | 649 | static struct tcf_proto_ops cls_route4_ops __read_mostly = { |
1da177e4 LT |
650 | .kind = "route", |
651 | .classify = route4_classify, | |
652 | .init = route4_init, | |
653 | .destroy = route4_destroy, | |
654 | .get = route4_get, | |
1da177e4 LT |
655 | .change = route4_change, |
656 | .delete = route4_delete, | |
657 | .walk = route4_walk, | |
658 | .dump = route4_dump, | |
659 | .owner = THIS_MODULE, | |
660 | }; | |
661 | ||
662 | static int __init init_route4(void) | |
663 | { | |
664 | return register_tcf_proto_ops(&cls_route4_ops); | |
665 | } | |
666 | ||
667 | static void __exit exit_route4(void) | |
668 | { | |
669 | unregister_tcf_proto_ops(&cls_route4_ops); | |
670 | } | |
671 | ||
672 | module_init(init_route4) | |
673 | module_exit(exit_route4) | |
674 | MODULE_LICENSE("GPL"); |