]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * net/sched/cls_tcindex.c Packet classifier for skb->tc_index | |
3 | * | |
4 | * Written 1998,1999 by Werner Almesberger, EPFL ICA | |
5 | */ | |
6 | ||
1da177e4 LT |
7 | #include <linux/module.h> |
8 | #include <linux/types.h> | |
9 | #include <linux/kernel.h> | |
10 | #include <linux/skbuff.h> | |
11 | #include <linux/errno.h> | |
5a0e3ad6 | 12 | #include <linux/slab.h> |
1da177e4 | 13 | #include <net/act_api.h> |
dc5fc579 | 14 | #include <net/netlink.h> |
1da177e4 | 15 | #include <net/pkt_cls.h> |
1da177e4 | 16 | |
1da177e4 LT |
17 | /* |
18 | * Passing parameters to the root seems to be done more awkwardly than really | |
19 | * necessary. At least, u32 doesn't seem to use such dirty hacks. To be | |
20 | * verified. FIXME. | |
21 | */ | |
22 | ||
23 | #define PERFECT_HASH_THRESHOLD 64 /* use perfect hash if not bigger */ | |
24 | #define DEFAULT_HASH_SIZE 64 /* optimized for diffserv */ | |
25 | ||
26 | ||
1da177e4 LT |
27 | struct tcindex_filter_result { |
28 | struct tcf_exts exts; | |
29 | struct tcf_result res; | |
ed7aa879 | 30 | struct rcu_head rcu; |
1da177e4 LT |
31 | }; |
32 | ||
33 | struct tcindex_filter { | |
34 | u16 key; | |
35 | struct tcindex_filter_result result; | |
331b7292 JF |
36 | struct tcindex_filter __rcu *next; |
37 | struct rcu_head rcu; | |
1da177e4 LT |
38 | }; |
39 | ||
40 | ||
41 | struct tcindex_data { | |
42 | struct tcindex_filter_result *perfect; /* perfect hash; NULL if none */ | |
331b7292 JF |
43 | struct tcindex_filter __rcu **h; /* imperfect hash; */ |
44 | struct tcf_proto *tp; | |
1da177e4 | 45 | u16 mask; /* AND key with mask */ |
331b7292 JF |
46 | u32 shift; /* shift ANDed key to the right */ |
47 | u32 hash; /* hash table size; 0 if undefined */ | |
48 | u32 alloc_hash; /* allocated size */ | |
49 | u32 fall_through; /* 0: only classify if explicit match */ | |
50 | struct rcu_head rcu; | |
1da177e4 LT |
51 | }; |
52 | ||
1da177e4 LT |
53 | static inline int |
54 | tcindex_filter_is_set(struct tcindex_filter_result *r) | |
55 | { | |
56 | return tcf_exts_is_predicative(&r->exts) || r->res.classid; | |
57 | } | |
58 | ||
59 | static struct tcindex_filter_result * | |
60 | tcindex_lookup(struct tcindex_data *p, u16 key) | |
61 | { | |
331b7292 JF |
62 | if (p->perfect) { |
63 | struct tcindex_filter_result *f = p->perfect + key; | |
64 | ||
65 | return tcindex_filter_is_set(f) ? f : NULL; | |
66 | } else if (p->h) { | |
67 | struct tcindex_filter __rcu **fp; | |
68 | struct tcindex_filter *f; | |
1da177e4 | 69 | |
331b7292 JF |
70 | fp = &p->h[key % p->hash]; |
71 | for (f = rcu_dereference_bh_rtnl(*fp); | |
72 | f; | |
73 | fp = &f->next, f = rcu_dereference_bh_rtnl(*fp)) | |
1da177e4 LT |
74 | if (f->key == key) |
75 | return &f->result; | |
76 | } | |
77 | ||
78 | return NULL; | |
79 | } | |
80 | ||
81 | ||
dc7f9f6e | 82 | static int tcindex_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
1da177e4 LT |
83 | struct tcf_result *res) |
84 | { | |
2f9a220e | 85 | struct tcindex_data *p = rcu_dereference_bh(tp->root); |
1da177e4 LT |
86 | struct tcindex_filter_result *f; |
87 | int key = (skb->tc_index & p->mask) >> p->shift; | |
88 | ||
aa767bfe SH |
89 | pr_debug("tcindex_classify(skb %p,tp %p,res %p),p %p\n", |
90 | skb, tp, res, p); | |
1da177e4 LT |
91 | |
92 | f = tcindex_lookup(p, key); | |
93 | if (!f) { | |
94 | if (!p->fall_through) | |
95 | return -1; | |
96 | res->classid = TC_H_MAKE(TC_H_MAJ(tp->q->handle), key); | |
97 | res->class = 0; | |
aa767bfe | 98 | pr_debug("alg 0x%x\n", res->classid); |
1da177e4 LT |
99 | return 0; |
100 | } | |
101 | *res = f->res; | |
aa767bfe | 102 | pr_debug("map 0x%x\n", res->classid); |
1da177e4 LT |
103 | |
104 | return tcf_exts_exec(skb, &f->exts, res); | |
105 | } | |
106 | ||
107 | ||
108 | static unsigned long tcindex_get(struct tcf_proto *tp, u32 handle) | |
109 | { | |
331b7292 | 110 | struct tcindex_data *p = rtnl_dereference(tp->root); |
1da177e4 LT |
111 | struct tcindex_filter_result *r; |
112 | ||
aa767bfe | 113 | pr_debug("tcindex_get(tp %p,handle 0x%08x)\n", tp, handle); |
1da177e4 LT |
114 | if (p->perfect && handle >= p->alloc_hash) |
115 | return 0; | |
116 | r = tcindex_lookup(p, handle); | |
117 | return r && tcindex_filter_is_set(r) ? (unsigned long) r : 0UL; | |
118 | } | |
119 | ||
1da177e4 LT |
120 | static int tcindex_init(struct tcf_proto *tp) |
121 | { | |
122 | struct tcindex_data *p; | |
123 | ||
aa767bfe SH |
124 | pr_debug("tcindex_init(tp %p)\n", tp); |
125 | p = kzalloc(sizeof(struct tcindex_data), GFP_KERNEL); | |
1da177e4 LT |
126 | if (!p) |
127 | return -ENOMEM; | |
128 | ||
1da177e4 LT |
129 | p->mask = 0xffff; |
130 | p->hash = DEFAULT_HASH_SIZE; | |
131 | p->fall_through = 1; | |
132 | ||
331b7292 | 133 | rcu_assign_pointer(tp->root, p); |
1da177e4 LT |
134 | return 0; |
135 | } | |
136 | ||
ed7aa879 AS |
137 | static void tcindex_destroy_rexts(struct rcu_head *head) |
138 | { | |
139 | struct tcindex_filter_result *r; | |
140 | ||
141 | r = container_of(head, struct tcindex_filter_result, rcu); | |
142 | tcf_exts_destroy(&r->exts); | |
143 | } | |
144 | ||
145 | static void tcindex_destroy_fexts(struct rcu_head *head) | |
146 | { | |
147 | struct tcindex_filter *f = container_of(head, struct tcindex_filter, rcu); | |
148 | ||
149 | tcf_exts_destroy(&f->result.exts); | |
150 | kfree(f); | |
151 | } | |
152 | ||
153 | static int tcindex_delete(struct tcf_proto *tp, unsigned long arg) | |
1da177e4 | 154 | { |
331b7292 | 155 | struct tcindex_data *p = rtnl_dereference(tp->root); |
1da177e4 | 156 | struct tcindex_filter_result *r = (struct tcindex_filter_result *) arg; |
331b7292 | 157 | struct tcindex_filter __rcu **walk; |
1da177e4 LT |
158 | struct tcindex_filter *f = NULL; |
159 | ||
331b7292 | 160 | pr_debug("tcindex_delete(tp %p,arg 0x%lx),p %p\n", tp, arg, p); |
1da177e4 LT |
161 | if (p->perfect) { |
162 | if (!r->res.class) | |
163 | return -ENOENT; | |
164 | } else { | |
165 | int i; | |
1da177e4 | 166 | |
331b7292 JF |
167 | for (i = 0; i < p->hash; i++) { |
168 | walk = p->h + i; | |
169 | for (f = rtnl_dereference(*walk); f; | |
170 | walk = &f->next, f = rtnl_dereference(*walk)) { | |
171 | if (&f->result == r) | |
1da177e4 | 172 | goto found; |
331b7292 JF |
173 | } |
174 | } | |
1da177e4 LT |
175 | return -ENOENT; |
176 | ||
177 | found: | |
331b7292 | 178 | rcu_assign_pointer(*walk, rtnl_dereference(f->next)); |
1da177e4 LT |
179 | } |
180 | tcf_unbind_filter(tp, &r->res); | |
ed7aa879 AS |
181 | /* all classifiers are required to call tcf_exts_destroy() after rcu |
182 | * grace period, since converted-to-rcu actions are relying on that | |
183 | * in cleanup() callback | |
184 | */ | |
331b7292 | 185 | if (f) |
ed7aa879 AS |
186 | call_rcu(&f->rcu, tcindex_destroy_fexts); |
187 | else | |
188 | call_rcu(&r->rcu, tcindex_destroy_rexts); | |
1da177e4 LT |
189 | return 0; |
190 | } | |
191 | ||
331b7292 JF |
192 | static int tcindex_destroy_element(struct tcf_proto *tp, |
193 | unsigned long arg, | |
194 | struct tcf_walker *walker) | |
1da177e4 | 195 | { |
331b7292 JF |
196 | return tcindex_delete(tp, arg); |
197 | } | |
198 | ||
199 | static void __tcindex_destroy(struct rcu_head *head) | |
200 | { | |
201 | struct tcindex_data *p = container_of(head, struct tcindex_data, rcu); | |
202 | ||
203 | kfree(p->perfect); | |
204 | kfree(p->h); | |
205 | kfree(p); | |
1da177e4 LT |
206 | } |
207 | ||
208 | static inline int | |
209 | valid_perfect_hash(struct tcindex_data *p) | |
210 | { | |
211 | return p->hash > (p->mask >> p->shift); | |
212 | } | |
213 | ||
6fa8c014 PM |
214 | static const struct nla_policy tcindex_policy[TCA_TCINDEX_MAX + 1] = { |
215 | [TCA_TCINDEX_HASH] = { .type = NLA_U32 }, | |
216 | [TCA_TCINDEX_MASK] = { .type = NLA_U16 }, | |
217 | [TCA_TCINDEX_SHIFT] = { .type = NLA_U32 }, | |
218 | [TCA_TCINDEX_FALL_THROUGH] = { .type = NLA_U32 }, | |
219 | [TCA_TCINDEX_CLASSID] = { .type = NLA_U32 }, | |
220 | }; | |
221 | ||
b9a24bb7 | 222 | static int tcindex_filter_result_init(struct tcindex_filter_result *r) |
bf63ac73 CW |
223 | { |
224 | memset(r, 0, sizeof(*r)); | |
b9a24bb7 | 225 | return tcf_exts_init(&r->exts, TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE); |
bf63ac73 CW |
226 | } |
227 | ||
331b7292 JF |
228 | static void __tcindex_partial_destroy(struct rcu_head *head) |
229 | { | |
230 | struct tcindex_data *p = container_of(head, struct tcindex_data, rcu); | |
231 | ||
232 | kfree(p->perfect); | |
233 | kfree(p); | |
234 | } | |
235 | ||
b9a24bb7 WC |
236 | static void tcindex_free_perfect_hash(struct tcindex_data *cp) |
237 | { | |
238 | int i; | |
239 | ||
240 | for (i = 0; i < cp->hash; i++) | |
241 | tcf_exts_destroy(&cp->perfect[i].exts); | |
242 | kfree(cp->perfect); | |
243 | } | |
244 | ||
245 | static int tcindex_alloc_perfect_hash(struct tcindex_data *cp) | |
246 | { | |
247 | int i, err = 0; | |
248 | ||
249 | cp->perfect = kcalloc(cp->hash, sizeof(struct tcindex_filter_result), | |
250 | GFP_KERNEL); | |
251 | if (!cp->perfect) | |
252 | return -ENOMEM; | |
253 | ||
254 | for (i = 0; i < cp->hash; i++) { | |
255 | err = tcf_exts_init(&cp->perfect[i].exts, | |
256 | TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE); | |
257 | if (err < 0) | |
258 | goto errout; | |
259 | } | |
260 | ||
261 | return 0; | |
262 | ||
263 | errout: | |
264 | tcindex_free_perfect_hash(cp); | |
265 | return err; | |
266 | } | |
267 | ||
1da177e4 | 268 | static int |
c1b52739 BL |
269 | tcindex_set_parms(struct net *net, struct tcf_proto *tp, unsigned long base, |
270 | u32 handle, struct tcindex_data *p, | |
271 | struct tcindex_filter_result *r, struct nlattr **tb, | |
2f7ef2f8 | 272 | struct nlattr *est, bool ovr) |
1da177e4 | 273 | { |
1da177e4 LT |
274 | struct tcindex_filter_result new_filter_result, *old_r = r; |
275 | struct tcindex_filter_result cr; | |
b9a24bb7 | 276 | struct tcindex_data *cp = NULL, *oldp; |
1da177e4 | 277 | struct tcindex_filter *f = NULL; /* make gcc behave */ |
b9a24bb7 | 278 | int err, balloc = 0; |
1da177e4 LT |
279 | struct tcf_exts e; |
280 | ||
b9a24bb7 | 281 | err = tcf_exts_init(&e, TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE); |
1da177e4 LT |
282 | if (err < 0) |
283 | return err; | |
b9a24bb7 WC |
284 | err = tcf_exts_validate(net, tp, tb, est, &e, ovr); |
285 | if (err < 0) | |
286 | goto errout; | |
10297b99 | 287 | |
02c5e844 | 288 | err = -ENOMEM; |
331b7292 JF |
289 | /* tcindex_data attributes must look atomic to classifier/lookup so |
290 | * allocate new tcindex data and RCU assign it onto root. Keeping | |
291 | * perfect hash and hash pointers from old data. | |
292 | */ | |
a57a65ba | 293 | cp = kzalloc(sizeof(*cp), GFP_KERNEL); |
02c5e844 | 294 | if (!cp) |
44b75e43 | 295 | goto errout; |
331b7292 JF |
296 | |
297 | cp->mask = p->mask; | |
298 | cp->shift = p->shift; | |
299 | cp->hash = p->hash; | |
300 | cp->alloc_hash = p->alloc_hash; | |
301 | cp->fall_through = p->fall_through; | |
302 | cp->tp = tp; | |
303 | ||
304 | if (p->perfect) { | |
6e056569 WC |
305 | int i; |
306 | ||
b9a24bb7 | 307 | if (tcindex_alloc_perfect_hash(cp) < 0) |
331b7292 | 308 | goto errout; |
6e056569 | 309 | for (i = 0; i < cp->hash; i++) |
b9a24bb7 | 310 | cp->perfect[i].res = p->perfect[i].res; |
44b75e43 | 311 | balloc = 1; |
331b7292 JF |
312 | } |
313 | cp->h = p->h; | |
314 | ||
b9a24bb7 WC |
315 | err = tcindex_filter_result_init(&new_filter_result); |
316 | if (err < 0) | |
317 | goto errout1; | |
318 | err = tcindex_filter_result_init(&cr); | |
319 | if (err < 0) | |
320 | goto errout1; | |
1da177e4 | 321 | if (old_r) |
bf63ac73 | 322 | cr.res = r->res; |
1da177e4 | 323 | |
6fa8c014 | 324 | if (tb[TCA_TCINDEX_HASH]) |
331b7292 | 325 | cp->hash = nla_get_u32(tb[TCA_TCINDEX_HASH]); |
1da177e4 | 326 | |
6fa8c014 | 327 | if (tb[TCA_TCINDEX_MASK]) |
331b7292 | 328 | cp->mask = nla_get_u16(tb[TCA_TCINDEX_MASK]); |
1da177e4 | 329 | |
6fa8c014 | 330 | if (tb[TCA_TCINDEX_SHIFT]) |
331b7292 | 331 | cp->shift = nla_get_u32(tb[TCA_TCINDEX_SHIFT]); |
1da177e4 LT |
332 | |
333 | err = -EBUSY; | |
331b7292 | 334 | |
1da177e4 LT |
335 | /* Hash already allocated, make sure that we still meet the |
336 | * requirements for the allocated hash. | |
337 | */ | |
331b7292 JF |
338 | if (cp->perfect) { |
339 | if (!valid_perfect_hash(cp) || | |
340 | cp->hash > cp->alloc_hash) | |
44b75e43 | 341 | goto errout_alloc; |
331b7292 | 342 | } else if (cp->h && cp->hash != cp->alloc_hash) { |
44b75e43 | 343 | goto errout_alloc; |
331b7292 | 344 | } |
1da177e4 LT |
345 | |
346 | err = -EINVAL; | |
6fa8c014 | 347 | if (tb[TCA_TCINDEX_FALL_THROUGH]) |
331b7292 | 348 | cp->fall_through = nla_get_u32(tb[TCA_TCINDEX_FALL_THROUGH]); |
1da177e4 | 349 | |
331b7292 | 350 | if (!cp->hash) { |
1da177e4 LT |
351 | /* Hash not specified, use perfect hash if the upper limit |
352 | * of the hashing index is below the threshold. | |
353 | */ | |
331b7292 JF |
354 | if ((cp->mask >> cp->shift) < PERFECT_HASH_THRESHOLD) |
355 | cp->hash = (cp->mask >> cp->shift) + 1; | |
1da177e4 | 356 | else |
331b7292 | 357 | cp->hash = DEFAULT_HASH_SIZE; |
1da177e4 LT |
358 | } |
359 | ||
68f6a7c6 | 360 | if (!cp->perfect && !cp->h) |
331b7292 | 361 | cp->alloc_hash = cp->hash; |
1da177e4 LT |
362 | |
363 | /* Note: this could be as restrictive as if (handle & ~(mask >> shift)) | |
364 | * but then, we'd fail handles that may become valid after some future | |
365 | * mask change. While this is extremely unlikely to ever matter, | |
366 | * the check below is safer (and also more backwards-compatible). | |
367 | */ | |
331b7292 JF |
368 | if (cp->perfect || valid_perfect_hash(cp)) |
369 | if (handle >= cp->alloc_hash) | |
44b75e43 | 370 | goto errout_alloc; |
1da177e4 LT |
371 | |
372 | ||
373 | err = -ENOMEM; | |
331b7292 JF |
374 | if (!cp->perfect && !cp->h) { |
375 | if (valid_perfect_hash(cp)) { | |
b9a24bb7 | 376 | if (tcindex_alloc_perfect_hash(cp) < 0) |
44b75e43 | 377 | goto errout_alloc; |
1da177e4 LT |
378 | balloc = 1; |
379 | } else { | |
331b7292 JF |
380 | struct tcindex_filter __rcu **hash; |
381 | ||
382 | hash = kcalloc(cp->hash, | |
383 | sizeof(struct tcindex_filter *), | |
384 | GFP_KERNEL); | |
385 | ||
386 | if (!hash) | |
44b75e43 | 387 | goto errout_alloc; |
331b7292 JF |
388 | |
389 | cp->h = hash; | |
1da177e4 LT |
390 | balloc = 2; |
391 | } | |
392 | } | |
393 | ||
331b7292 JF |
394 | if (cp->perfect) |
395 | r = cp->perfect + handle; | |
1da177e4 | 396 | else |
331b7292 | 397 | r = tcindex_lookup(cp, handle) ? : &new_filter_result; |
1da177e4 LT |
398 | |
399 | if (r == &new_filter_result) { | |
0da974f4 | 400 | f = kzalloc(sizeof(*f), GFP_KERNEL); |
1da177e4 LT |
401 | if (!f) |
402 | goto errout_alloc; | |
6e056569 | 403 | f->key = handle; |
6e056569 | 404 | f->next = NULL; |
b9a24bb7 WC |
405 | err = tcindex_filter_result_init(&f->result); |
406 | if (err < 0) { | |
407 | kfree(f); | |
408 | goto errout_alloc; | |
409 | } | |
10297b99 | 410 | } |
1da177e4 | 411 | |
add93b61 | 412 | if (tb[TCA_TCINDEX_CLASSID]) { |
1587bac4 | 413 | cr.res.classid = nla_get_u32(tb[TCA_TCINDEX_CLASSID]); |
1da177e4 | 414 | tcf_bind_filter(tp, &cr.res, base); |
10297b99 | 415 | } |
1da177e4 | 416 | |
bf63ac73 CW |
417 | if (old_r) |
418 | tcf_exts_change(tp, &r->exts, &e); | |
419 | else | |
420 | tcf_exts_change(tp, &cr.exts, &e); | |
1da177e4 | 421 | |
b9a24bb7 WC |
422 | if (old_r && old_r != r) { |
423 | err = tcindex_filter_result_init(old_r); | |
424 | if (err < 0) { | |
425 | kfree(f); | |
426 | goto errout_alloc; | |
427 | } | |
428 | } | |
1da177e4 | 429 | |
331b7292 | 430 | oldp = p; |
bf63ac73 | 431 | r->res = cr.res; |
331b7292 | 432 | rcu_assign_pointer(tp->root, cp); |
1da177e4 LT |
433 | |
434 | if (r == &new_filter_result) { | |
331b7292 JF |
435 | struct tcindex_filter *nfp; |
436 | struct tcindex_filter __rcu **fp; | |
1da177e4 | 437 | |
6e056569 | 438 | tcf_exts_change(tp, &f->result.exts, &r->exts); |
331b7292 | 439 | |
69301eaa | 440 | fp = cp->h + (handle % cp->hash); |
331b7292 JF |
441 | for (nfp = rtnl_dereference(*fp); |
442 | nfp; | |
443 | fp = &nfp->next, nfp = rtnl_dereference(*fp)) | |
444 | ; /* nothing */ | |
445 | ||
446 | rcu_assign_pointer(*fp, f); | |
10297b99 | 447 | } |
1da177e4 | 448 | |
331b7292 JF |
449 | if (oldp) |
450 | call_rcu(&oldp->rcu, __tcindex_partial_destroy); | |
1da177e4 LT |
451 | return 0; |
452 | ||
453 | errout_alloc: | |
454 | if (balloc == 1) | |
b9a24bb7 | 455 | tcindex_free_perfect_hash(cp); |
1da177e4 | 456 | else if (balloc == 2) |
331b7292 | 457 | kfree(cp->h); |
b9a24bb7 WC |
458 | errout1: |
459 | tcf_exts_destroy(&cr.exts); | |
460 | tcf_exts_destroy(&new_filter_result.exts); | |
1da177e4 | 461 | errout: |
331b7292 | 462 | kfree(cp); |
18d0264f | 463 | tcf_exts_destroy(&e); |
1da177e4 LT |
464 | return err; |
465 | } | |
466 | ||
467 | static int | |
c1b52739 | 468 | tcindex_change(struct net *net, struct sk_buff *in_skb, |
af4c6641 | 469 | struct tcf_proto *tp, unsigned long base, u32 handle, |
2f7ef2f8 | 470 | struct nlattr **tca, unsigned long *arg, bool ovr) |
1da177e4 | 471 | { |
add93b61 PM |
472 | struct nlattr *opt = tca[TCA_OPTIONS]; |
473 | struct nlattr *tb[TCA_TCINDEX_MAX + 1]; | |
331b7292 | 474 | struct tcindex_data *p = rtnl_dereference(tp->root); |
1da177e4 | 475 | struct tcindex_filter_result *r = (struct tcindex_filter_result *) *arg; |
cee63723 | 476 | int err; |
1da177e4 | 477 | |
aa767bfe | 478 | pr_debug("tcindex_change(tp %p,handle 0x%08x,tca %p,arg %p),opt %p," |
1da177e4 LT |
479 | "p %p,r %p,*arg 0x%lx\n", |
480 | tp, handle, tca, arg, opt, p, r, arg ? *arg : 0L); | |
481 | ||
482 | if (!opt) | |
483 | return 0; | |
484 | ||
6fa8c014 | 485 | err = nla_parse_nested(tb, TCA_TCINDEX_MAX, opt, tcindex_policy); |
cee63723 PM |
486 | if (err < 0) |
487 | return err; | |
1da177e4 | 488 | |
c1b52739 | 489 | return tcindex_set_parms(net, tp, base, handle, p, r, tb, |
2f7ef2f8 | 490 | tca[TCA_RATE], ovr); |
1da177e4 LT |
491 | } |
492 | ||
1da177e4 LT |
493 | static void tcindex_walk(struct tcf_proto *tp, struct tcf_walker *walker) |
494 | { | |
331b7292 | 495 | struct tcindex_data *p = rtnl_dereference(tp->root); |
aa767bfe | 496 | struct tcindex_filter *f, *next; |
1da177e4 LT |
497 | int i; |
498 | ||
aa767bfe | 499 | pr_debug("tcindex_walk(tp %p,walker %p),p %p\n", tp, walker, p); |
1da177e4 LT |
500 | if (p->perfect) { |
501 | for (i = 0; i < p->hash; i++) { | |
502 | if (!p->perfect[i].res.class) | |
503 | continue; | |
504 | if (walker->count >= walker->skip) { | |
505 | if (walker->fn(tp, | |
506 | (unsigned long) (p->perfect+i), walker) | |
507 | < 0) { | |
508 | walker->stop = 1; | |
509 | return; | |
510 | } | |
511 | } | |
512 | walker->count++; | |
513 | } | |
514 | } | |
515 | if (!p->h) | |
516 | return; | |
517 | for (i = 0; i < p->hash; i++) { | |
331b7292 JF |
518 | for (f = rtnl_dereference(p->h[i]); f; f = next) { |
519 | next = rtnl_dereference(f->next); | |
1da177e4 | 520 | if (walker->count >= walker->skip) { |
aa767bfe | 521 | if (walker->fn(tp, (unsigned long) &f->result, |
1da177e4 LT |
522 | walker) < 0) { |
523 | walker->stop = 1; | |
524 | return; | |
525 | } | |
526 | } | |
527 | walker->count++; | |
528 | } | |
529 | } | |
530 | } | |
531 | ||
1e052be6 | 532 | static bool tcindex_destroy(struct tcf_proto *tp, bool force) |
1da177e4 | 533 | { |
331b7292 | 534 | struct tcindex_data *p = rtnl_dereference(tp->root); |
1da177e4 LT |
535 | struct tcf_walker walker; |
536 | ||
1e052be6 CW |
537 | if (!force) |
538 | return false; | |
539 | ||
aa767bfe | 540 | pr_debug("tcindex_destroy(tp %p),p %p\n", tp, p); |
1da177e4 LT |
541 | walker.count = 0; |
542 | walker.skip = 0; | |
e40f5c72 | 543 | walker.fn = tcindex_destroy_element; |
aa767bfe | 544 | tcindex_walk(tp, &walker); |
331b7292 JF |
545 | |
546 | RCU_INIT_POINTER(tp->root, NULL); | |
547 | call_rcu(&p->rcu, __tcindex_destroy); | |
1e052be6 | 548 | return true; |
1da177e4 LT |
549 | } |
550 | ||
551 | ||
832d1d5b | 552 | static int tcindex_dump(struct net *net, struct tcf_proto *tp, unsigned long fh, |
1da177e4 LT |
553 | struct sk_buff *skb, struct tcmsg *t) |
554 | { | |
331b7292 | 555 | struct tcindex_data *p = rtnl_dereference(tp->root); |
1da177e4 | 556 | struct tcindex_filter_result *r = (struct tcindex_filter_result *) fh; |
4b3550ef | 557 | struct nlattr *nest; |
1da177e4 | 558 | |
6ea3b446 JP |
559 | pr_debug("tcindex_dump(tp %p,fh 0x%lx,skb %p,t %p),p %p,r %p\n", |
560 | tp, fh, skb, t, p, r); | |
aa767bfe | 561 | pr_debug("p->perfect %p p->h %p\n", p->perfect, p->h); |
4b3550ef PM |
562 | |
563 | nest = nla_nest_start(skb, TCA_OPTIONS); | |
564 | if (nest == NULL) | |
565 | goto nla_put_failure; | |
566 | ||
1da177e4 LT |
567 | if (!fh) { |
568 | t->tcm_handle = ~0; /* whatever ... */ | |
1b34ec43 DM |
569 | if (nla_put_u32(skb, TCA_TCINDEX_HASH, p->hash) || |
570 | nla_put_u16(skb, TCA_TCINDEX_MASK, p->mask) || | |
571 | nla_put_u32(skb, TCA_TCINDEX_SHIFT, p->shift) || | |
572 | nla_put_u32(skb, TCA_TCINDEX_FALL_THROUGH, p->fall_through)) | |
573 | goto nla_put_failure; | |
4b3550ef | 574 | nla_nest_end(skb, nest); |
1da177e4 LT |
575 | } else { |
576 | if (p->perfect) { | |
331b7292 | 577 | t->tcm_handle = r - p->perfect; |
1da177e4 LT |
578 | } else { |
579 | struct tcindex_filter *f; | |
331b7292 | 580 | struct tcindex_filter __rcu **fp; |
1da177e4 LT |
581 | int i; |
582 | ||
583 | t->tcm_handle = 0; | |
584 | for (i = 0; !t->tcm_handle && i < p->hash; i++) { | |
331b7292 JF |
585 | fp = &p->h[i]; |
586 | for (f = rtnl_dereference(*fp); | |
587 | !t->tcm_handle && f; | |
588 | fp = &f->next, f = rtnl_dereference(*fp)) { | |
1da177e4 LT |
589 | if (&f->result == r) |
590 | t->tcm_handle = f->key; | |
591 | } | |
592 | } | |
593 | } | |
aa767bfe | 594 | pr_debug("handle = %d\n", t->tcm_handle); |
1b34ec43 DM |
595 | if (r->res.class && |
596 | nla_put_u32(skb, TCA_TCINDEX_CLASSID, r->res.classid)) | |
597 | goto nla_put_failure; | |
1da177e4 | 598 | |
5da57f42 | 599 | if (tcf_exts_dump(skb, &r->exts) < 0) |
add93b61 | 600 | goto nla_put_failure; |
4b3550ef | 601 | nla_nest_end(skb, nest); |
1da177e4 | 602 | |
5da57f42 | 603 | if (tcf_exts_dump_stats(skb, &r->exts) < 0) |
add93b61 | 604 | goto nla_put_failure; |
1da177e4 | 605 | } |
10297b99 | 606 | |
1da177e4 LT |
607 | return skb->len; |
608 | ||
add93b61 | 609 | nla_put_failure: |
6ea3b446 | 610 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
611 | return -1; |
612 | } | |
613 | ||
2eb9d75c | 614 | static struct tcf_proto_ops cls_tcindex_ops __read_mostly = { |
1da177e4 LT |
615 | .kind = "tcindex", |
616 | .classify = tcindex_classify, | |
617 | .init = tcindex_init, | |
618 | .destroy = tcindex_destroy, | |
619 | .get = tcindex_get, | |
1da177e4 LT |
620 | .change = tcindex_change, |
621 | .delete = tcindex_delete, | |
622 | .walk = tcindex_walk, | |
623 | .dump = tcindex_dump, | |
624 | .owner = THIS_MODULE, | |
625 | }; | |
626 | ||
627 | static int __init init_tcindex(void) | |
628 | { | |
629 | return register_tcf_proto_ops(&cls_tcindex_ops); | |
630 | } | |
631 | ||
10297b99 | 632 | static void __exit exit_tcindex(void) |
1da177e4 LT |
633 | { |
634 | unregister_tcf_proto_ops(&cls_tcindex_ops); | |
635 | } | |
636 | ||
637 | module_init(init_tcindex) | |
638 | module_exit(exit_tcindex) | |
639 | MODULE_LICENSE("GPL"); |