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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> |
1abf2720 | 16 | #include <net/sch_generic.h> |
1da177e4 | 17 | |
1da177e4 LT |
18 | /* |
19 | * Passing parameters to the root seems to be done more awkwardly than really | |
20 | * necessary. At least, u32 doesn't seem to use such dirty hacks. To be | |
21 | * verified. FIXME. | |
22 | */ | |
23 | ||
24 | #define PERFECT_HASH_THRESHOLD 64 /* use perfect hash if not bigger */ | |
25 | #define DEFAULT_HASH_SIZE 64 /* optimized for diffserv */ | |
26 | ||
27 | ||
1da177e4 LT |
28 | struct tcindex_filter_result { |
29 | struct tcf_exts exts; | |
30 | struct tcf_result res; | |
27ce4f05 CW |
31 | union { |
32 | struct work_struct work; | |
33 | struct rcu_head rcu; | |
34 | }; | |
1da177e4 LT |
35 | }; |
36 | ||
37 | struct tcindex_filter { | |
38 | u16 key; | |
39 | struct tcindex_filter_result result; | |
331b7292 | 40 | struct tcindex_filter __rcu *next; |
27ce4f05 CW |
41 | union { |
42 | struct work_struct work; | |
43 | struct rcu_head rcu; | |
44 | }; | |
1da177e4 LT |
45 | }; |
46 | ||
47 | ||
48 | struct tcindex_data { | |
49 | struct tcindex_filter_result *perfect; /* perfect hash; NULL if none */ | |
331b7292 JF |
50 | struct tcindex_filter __rcu **h; /* imperfect hash; */ |
51 | struct tcf_proto *tp; | |
1da177e4 | 52 | u16 mask; /* AND key with mask */ |
331b7292 JF |
53 | u32 shift; /* shift ANDed key to the right */ |
54 | u32 hash; /* hash table size; 0 if undefined */ | |
55 | u32 alloc_hash; /* allocated size */ | |
56 | u32 fall_through; /* 0: only classify if explicit match */ | |
57 | struct rcu_head rcu; | |
1da177e4 LT |
58 | }; |
59 | ||
5a7a5555 | 60 | static inline int tcindex_filter_is_set(struct tcindex_filter_result *r) |
1da177e4 | 61 | { |
6fc6d06e | 62 | return tcf_exts_has_actions(&r->exts) || r->res.classid; |
1da177e4 LT |
63 | } |
64 | ||
5a7a5555 JHS |
65 | static struct tcindex_filter_result *tcindex_lookup(struct tcindex_data *p, |
66 | u16 key) | |
1da177e4 | 67 | { |
331b7292 JF |
68 | if (p->perfect) { |
69 | struct tcindex_filter_result *f = p->perfect + key; | |
70 | ||
71 | return tcindex_filter_is_set(f) ? f : NULL; | |
72 | } else if (p->h) { | |
73 | struct tcindex_filter __rcu **fp; | |
74 | struct tcindex_filter *f; | |
1da177e4 | 75 | |
331b7292 JF |
76 | fp = &p->h[key % p->hash]; |
77 | for (f = rcu_dereference_bh_rtnl(*fp); | |
78 | f; | |
79 | fp = &f->next, f = rcu_dereference_bh_rtnl(*fp)) | |
1da177e4 LT |
80 | if (f->key == key) |
81 | return &f->result; | |
82 | } | |
83 | ||
84 | return NULL; | |
85 | } | |
86 | ||
87 | ||
dc7f9f6e | 88 | static int tcindex_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
1da177e4 LT |
89 | struct tcf_result *res) |
90 | { | |
2f9a220e | 91 | struct tcindex_data *p = rcu_dereference_bh(tp->root); |
1da177e4 LT |
92 | struct tcindex_filter_result *f; |
93 | int key = (skb->tc_index & p->mask) >> p->shift; | |
94 | ||
aa767bfe SH |
95 | pr_debug("tcindex_classify(skb %p,tp %p,res %p),p %p\n", |
96 | skb, tp, res, p); | |
1da177e4 LT |
97 | |
98 | f = tcindex_lookup(p, key); | |
99 | if (!f) { | |
1abf2720 JP |
100 | struct Qdisc *q = tcf_block_q(tp->chain->block); |
101 | ||
1da177e4 LT |
102 | if (!p->fall_through) |
103 | return -1; | |
1abf2720 | 104 | res->classid = TC_H_MAKE(TC_H_MAJ(q->handle), key); |
1da177e4 | 105 | res->class = 0; |
aa767bfe | 106 | pr_debug("alg 0x%x\n", res->classid); |
1da177e4 LT |
107 | return 0; |
108 | } | |
109 | *res = f->res; | |
aa767bfe | 110 | pr_debug("map 0x%x\n", res->classid); |
1da177e4 LT |
111 | |
112 | return tcf_exts_exec(skb, &f->exts, res); | |
113 | } | |
114 | ||
115 | ||
8113c095 | 116 | static void *tcindex_get(struct tcf_proto *tp, u32 handle) |
1da177e4 | 117 | { |
331b7292 | 118 | struct tcindex_data *p = rtnl_dereference(tp->root); |
1da177e4 LT |
119 | struct tcindex_filter_result *r; |
120 | ||
aa767bfe | 121 | pr_debug("tcindex_get(tp %p,handle 0x%08x)\n", tp, handle); |
1da177e4 | 122 | if (p->perfect && handle >= p->alloc_hash) |
8113c095 | 123 | return NULL; |
1da177e4 | 124 | r = tcindex_lookup(p, handle); |
8113c095 | 125 | return r && tcindex_filter_is_set(r) ? r : NULL; |
1da177e4 LT |
126 | } |
127 | ||
1da177e4 LT |
128 | static int tcindex_init(struct tcf_proto *tp) |
129 | { | |
130 | struct tcindex_data *p; | |
131 | ||
aa767bfe SH |
132 | pr_debug("tcindex_init(tp %p)\n", tp); |
133 | p = kzalloc(sizeof(struct tcindex_data), GFP_KERNEL); | |
1da177e4 LT |
134 | if (!p) |
135 | return -ENOMEM; | |
136 | ||
1da177e4 LT |
137 | p->mask = 0xffff; |
138 | p->hash = DEFAULT_HASH_SIZE; | |
139 | p->fall_through = 1; | |
140 | ||
331b7292 | 141 | rcu_assign_pointer(tp->root, p); |
1da177e4 LT |
142 | return 0; |
143 | } | |
144 | ||
f2b75105 CW |
145 | static void __tcindex_destroy_rexts(struct tcindex_filter_result *r) |
146 | { | |
147 | tcf_exts_destroy(&r->exts); | |
148 | tcf_exts_put_net(&r->exts); | |
149 | } | |
150 | ||
27ce4f05 CW |
151 | static void tcindex_destroy_rexts_work(struct work_struct *work) |
152 | { | |
153 | struct tcindex_filter_result *r; | |
154 | ||
155 | r = container_of(work, struct tcindex_filter_result, work); | |
156 | rtnl_lock(); | |
f2b75105 | 157 | __tcindex_destroy_rexts(r); |
27ce4f05 CW |
158 | rtnl_unlock(); |
159 | } | |
160 | ||
ed7aa879 AS |
161 | static void tcindex_destroy_rexts(struct rcu_head *head) |
162 | { | |
163 | struct tcindex_filter_result *r; | |
164 | ||
165 | r = container_of(head, struct tcindex_filter_result, rcu); | |
27ce4f05 CW |
166 | INIT_WORK(&r->work, tcindex_destroy_rexts_work); |
167 | tcf_queue_work(&r->work); | |
168 | } | |
169 | ||
f2b75105 CW |
170 | static void __tcindex_destroy_fexts(struct tcindex_filter *f) |
171 | { | |
172 | tcf_exts_destroy(&f->result.exts); | |
173 | tcf_exts_put_net(&f->result.exts); | |
174 | kfree(f); | |
175 | } | |
176 | ||
27ce4f05 CW |
177 | static void tcindex_destroy_fexts_work(struct work_struct *work) |
178 | { | |
179 | struct tcindex_filter *f = container_of(work, struct tcindex_filter, | |
180 | work); | |
181 | ||
182 | rtnl_lock(); | |
f2b75105 | 183 | __tcindex_destroy_fexts(f); |
27ce4f05 | 184 | rtnl_unlock(); |
ed7aa879 AS |
185 | } |
186 | ||
187 | static void tcindex_destroy_fexts(struct rcu_head *head) | |
188 | { | |
5a7a5555 JHS |
189 | struct tcindex_filter *f = container_of(head, struct tcindex_filter, |
190 | rcu); | |
ed7aa879 | 191 | |
27ce4f05 CW |
192 | INIT_WORK(&f->work, tcindex_destroy_fexts_work); |
193 | tcf_queue_work(&f->work); | |
ed7aa879 AS |
194 | } |
195 | ||
8113c095 | 196 | static int tcindex_delete(struct tcf_proto *tp, void *arg, bool *last) |
1da177e4 | 197 | { |
331b7292 | 198 | struct tcindex_data *p = rtnl_dereference(tp->root); |
8113c095 | 199 | struct tcindex_filter_result *r = arg; |
331b7292 | 200 | struct tcindex_filter __rcu **walk; |
1da177e4 LT |
201 | struct tcindex_filter *f = NULL; |
202 | ||
8113c095 | 203 | pr_debug("tcindex_delete(tp %p,arg %p),p %p\n", tp, arg, p); |
1da177e4 LT |
204 | if (p->perfect) { |
205 | if (!r->res.class) | |
206 | return -ENOENT; | |
207 | } else { | |
208 | int i; | |
1da177e4 | 209 | |
331b7292 JF |
210 | for (i = 0; i < p->hash; i++) { |
211 | walk = p->h + i; | |
212 | for (f = rtnl_dereference(*walk); f; | |
213 | walk = &f->next, f = rtnl_dereference(*walk)) { | |
214 | if (&f->result == r) | |
1da177e4 | 215 | goto found; |
331b7292 JF |
216 | } |
217 | } | |
1da177e4 LT |
218 | return -ENOENT; |
219 | ||
220 | found: | |
331b7292 | 221 | rcu_assign_pointer(*walk, rtnl_dereference(f->next)); |
1da177e4 LT |
222 | } |
223 | tcf_unbind_filter(tp, &r->res); | |
ed7aa879 AS |
224 | /* all classifiers are required to call tcf_exts_destroy() after rcu |
225 | * grace period, since converted-to-rcu actions are relying on that | |
226 | * in cleanup() callback | |
227 | */ | |
f2b75105 CW |
228 | if (f) { |
229 | if (tcf_exts_get_net(&f->result.exts)) | |
230 | call_rcu(&f->rcu, tcindex_destroy_fexts); | |
231 | else | |
232 | __tcindex_destroy_fexts(f); | |
233 | } else { | |
234 | if (tcf_exts_get_net(&r->exts)) | |
235 | call_rcu(&r->rcu, tcindex_destroy_rexts); | |
236 | else | |
237 | __tcindex_destroy_rexts(r); | |
238 | } | |
763dbf63 WC |
239 | |
240 | *last = false; | |
1da177e4 LT |
241 | return 0; |
242 | } | |
243 | ||
331b7292 | 244 | static int tcindex_destroy_element(struct tcf_proto *tp, |
8113c095 | 245 | void *arg, struct tcf_walker *walker) |
1da177e4 | 246 | { |
763dbf63 WC |
247 | bool last; |
248 | ||
249 | return tcindex_delete(tp, arg, &last); | |
331b7292 JF |
250 | } |
251 | ||
252 | static void __tcindex_destroy(struct rcu_head *head) | |
253 | { | |
254 | struct tcindex_data *p = container_of(head, struct tcindex_data, rcu); | |
255 | ||
256 | kfree(p->perfect); | |
257 | kfree(p->h); | |
258 | kfree(p); | |
1da177e4 LT |
259 | } |
260 | ||
261 | static inline int | |
262 | valid_perfect_hash(struct tcindex_data *p) | |
263 | { | |
264 | return p->hash > (p->mask >> p->shift); | |
265 | } | |
266 | ||
6fa8c014 PM |
267 | static const struct nla_policy tcindex_policy[TCA_TCINDEX_MAX + 1] = { |
268 | [TCA_TCINDEX_HASH] = { .type = NLA_U32 }, | |
269 | [TCA_TCINDEX_MASK] = { .type = NLA_U16 }, | |
270 | [TCA_TCINDEX_SHIFT] = { .type = NLA_U32 }, | |
271 | [TCA_TCINDEX_FALL_THROUGH] = { .type = NLA_U32 }, | |
272 | [TCA_TCINDEX_CLASSID] = { .type = NLA_U32 }, | |
273 | }; | |
274 | ||
b9a24bb7 | 275 | static int tcindex_filter_result_init(struct tcindex_filter_result *r) |
bf63ac73 CW |
276 | { |
277 | memset(r, 0, sizeof(*r)); | |
b9a24bb7 | 278 | return tcf_exts_init(&r->exts, TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE); |
bf63ac73 CW |
279 | } |
280 | ||
331b7292 JF |
281 | static void __tcindex_partial_destroy(struct rcu_head *head) |
282 | { | |
283 | struct tcindex_data *p = container_of(head, struct tcindex_data, rcu); | |
284 | ||
285 | kfree(p->perfect); | |
286 | kfree(p); | |
287 | } | |
288 | ||
b9a24bb7 WC |
289 | static void tcindex_free_perfect_hash(struct tcindex_data *cp) |
290 | { | |
291 | int i; | |
292 | ||
293 | for (i = 0; i < cp->hash; i++) | |
294 | tcf_exts_destroy(&cp->perfect[i].exts); | |
295 | kfree(cp->perfect); | |
296 | } | |
297 | ||
298 | static int tcindex_alloc_perfect_hash(struct tcindex_data *cp) | |
299 | { | |
300 | int i, err = 0; | |
301 | ||
302 | cp->perfect = kcalloc(cp->hash, sizeof(struct tcindex_filter_result), | |
303 | GFP_KERNEL); | |
304 | if (!cp->perfect) | |
305 | return -ENOMEM; | |
306 | ||
307 | for (i = 0; i < cp->hash; i++) { | |
308 | err = tcf_exts_init(&cp->perfect[i].exts, | |
309 | TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE); | |
310 | if (err < 0) | |
311 | goto errout; | |
312 | } | |
313 | ||
314 | return 0; | |
315 | ||
316 | errout: | |
317 | tcindex_free_perfect_hash(cp); | |
318 | return err; | |
319 | } | |
320 | ||
1da177e4 | 321 | static int |
c1b52739 BL |
322 | tcindex_set_parms(struct net *net, struct tcf_proto *tp, unsigned long base, |
323 | u32 handle, struct tcindex_data *p, | |
324 | struct tcindex_filter_result *r, struct nlattr **tb, | |
2f7ef2f8 | 325 | struct nlattr *est, bool ovr) |
1da177e4 | 326 | { |
1da177e4 LT |
327 | struct tcindex_filter_result new_filter_result, *old_r = r; |
328 | struct tcindex_filter_result cr; | |
b9a24bb7 | 329 | struct tcindex_data *cp = NULL, *oldp; |
1da177e4 | 330 | struct tcindex_filter *f = NULL; /* make gcc behave */ |
b9a24bb7 | 331 | int err, balloc = 0; |
1da177e4 LT |
332 | struct tcf_exts e; |
333 | ||
b9a24bb7 | 334 | err = tcf_exts_init(&e, TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE); |
1da177e4 LT |
335 | if (err < 0) |
336 | return err; | |
b9a24bb7 WC |
337 | err = tcf_exts_validate(net, tp, tb, est, &e, ovr); |
338 | if (err < 0) | |
339 | goto errout; | |
10297b99 | 340 | |
02c5e844 | 341 | err = -ENOMEM; |
331b7292 JF |
342 | /* tcindex_data attributes must look atomic to classifier/lookup so |
343 | * allocate new tcindex data and RCU assign it onto root. Keeping | |
344 | * perfect hash and hash pointers from old data. | |
345 | */ | |
a57a65ba | 346 | cp = kzalloc(sizeof(*cp), GFP_KERNEL); |
02c5e844 | 347 | if (!cp) |
44b75e43 | 348 | goto errout; |
331b7292 JF |
349 | |
350 | cp->mask = p->mask; | |
351 | cp->shift = p->shift; | |
352 | cp->hash = p->hash; | |
353 | cp->alloc_hash = p->alloc_hash; | |
354 | cp->fall_through = p->fall_through; | |
355 | cp->tp = tp; | |
356 | ||
357 | if (p->perfect) { | |
6e056569 WC |
358 | int i; |
359 | ||
b9a24bb7 | 360 | if (tcindex_alloc_perfect_hash(cp) < 0) |
331b7292 | 361 | goto errout; |
6e056569 | 362 | for (i = 0; i < cp->hash; i++) |
b9a24bb7 | 363 | cp->perfect[i].res = p->perfect[i].res; |
44b75e43 | 364 | balloc = 1; |
331b7292 JF |
365 | } |
366 | cp->h = p->h; | |
367 | ||
b9a24bb7 WC |
368 | err = tcindex_filter_result_init(&new_filter_result); |
369 | if (err < 0) | |
370 | goto errout1; | |
371 | err = tcindex_filter_result_init(&cr); | |
372 | if (err < 0) | |
373 | goto errout1; | |
1da177e4 | 374 | if (old_r) |
bf63ac73 | 375 | cr.res = r->res; |
1da177e4 | 376 | |
6fa8c014 | 377 | if (tb[TCA_TCINDEX_HASH]) |
331b7292 | 378 | cp->hash = nla_get_u32(tb[TCA_TCINDEX_HASH]); |
1da177e4 | 379 | |
6fa8c014 | 380 | if (tb[TCA_TCINDEX_MASK]) |
331b7292 | 381 | cp->mask = nla_get_u16(tb[TCA_TCINDEX_MASK]); |
1da177e4 | 382 | |
6fa8c014 | 383 | if (tb[TCA_TCINDEX_SHIFT]) |
331b7292 | 384 | cp->shift = nla_get_u32(tb[TCA_TCINDEX_SHIFT]); |
1da177e4 LT |
385 | |
386 | err = -EBUSY; | |
331b7292 | 387 | |
1da177e4 LT |
388 | /* Hash already allocated, make sure that we still meet the |
389 | * requirements for the allocated hash. | |
390 | */ | |
331b7292 JF |
391 | if (cp->perfect) { |
392 | if (!valid_perfect_hash(cp) || | |
393 | cp->hash > cp->alloc_hash) | |
44b75e43 | 394 | goto errout_alloc; |
331b7292 | 395 | } else if (cp->h && cp->hash != cp->alloc_hash) { |
44b75e43 | 396 | goto errout_alloc; |
331b7292 | 397 | } |
1da177e4 LT |
398 | |
399 | err = -EINVAL; | |
6fa8c014 | 400 | if (tb[TCA_TCINDEX_FALL_THROUGH]) |
331b7292 | 401 | cp->fall_through = nla_get_u32(tb[TCA_TCINDEX_FALL_THROUGH]); |
1da177e4 | 402 | |
331b7292 | 403 | if (!cp->hash) { |
1da177e4 LT |
404 | /* Hash not specified, use perfect hash if the upper limit |
405 | * of the hashing index is below the threshold. | |
406 | */ | |
331b7292 JF |
407 | if ((cp->mask >> cp->shift) < PERFECT_HASH_THRESHOLD) |
408 | cp->hash = (cp->mask >> cp->shift) + 1; | |
1da177e4 | 409 | else |
331b7292 | 410 | cp->hash = DEFAULT_HASH_SIZE; |
1da177e4 LT |
411 | } |
412 | ||
68f6a7c6 | 413 | if (!cp->perfect && !cp->h) |
331b7292 | 414 | cp->alloc_hash = cp->hash; |
1da177e4 LT |
415 | |
416 | /* Note: this could be as restrictive as if (handle & ~(mask >> shift)) | |
417 | * but then, we'd fail handles that may become valid after some future | |
418 | * mask change. While this is extremely unlikely to ever matter, | |
419 | * the check below is safer (and also more backwards-compatible). | |
420 | */ | |
331b7292 JF |
421 | if (cp->perfect || valid_perfect_hash(cp)) |
422 | if (handle >= cp->alloc_hash) | |
44b75e43 | 423 | goto errout_alloc; |
1da177e4 LT |
424 | |
425 | ||
426 | err = -ENOMEM; | |
331b7292 JF |
427 | if (!cp->perfect && !cp->h) { |
428 | if (valid_perfect_hash(cp)) { | |
b9a24bb7 | 429 | if (tcindex_alloc_perfect_hash(cp) < 0) |
44b75e43 | 430 | goto errout_alloc; |
1da177e4 LT |
431 | balloc = 1; |
432 | } else { | |
331b7292 JF |
433 | struct tcindex_filter __rcu **hash; |
434 | ||
435 | hash = kcalloc(cp->hash, | |
436 | sizeof(struct tcindex_filter *), | |
437 | GFP_KERNEL); | |
438 | ||
439 | if (!hash) | |
44b75e43 | 440 | goto errout_alloc; |
331b7292 JF |
441 | |
442 | cp->h = hash; | |
1da177e4 LT |
443 | balloc = 2; |
444 | } | |
445 | } | |
446 | ||
331b7292 JF |
447 | if (cp->perfect) |
448 | r = cp->perfect + handle; | |
1da177e4 | 449 | else |
331b7292 | 450 | r = tcindex_lookup(cp, handle) ? : &new_filter_result; |
1da177e4 LT |
451 | |
452 | if (r == &new_filter_result) { | |
0da974f4 | 453 | f = kzalloc(sizeof(*f), GFP_KERNEL); |
1da177e4 LT |
454 | if (!f) |
455 | goto errout_alloc; | |
6e056569 | 456 | f->key = handle; |
6e056569 | 457 | f->next = NULL; |
b9a24bb7 WC |
458 | err = tcindex_filter_result_init(&f->result); |
459 | if (err < 0) { | |
460 | kfree(f); | |
461 | goto errout_alloc; | |
462 | } | |
10297b99 | 463 | } |
1da177e4 | 464 | |
add93b61 | 465 | if (tb[TCA_TCINDEX_CLASSID]) { |
1587bac4 | 466 | cr.res.classid = nla_get_u32(tb[TCA_TCINDEX_CLASSID]); |
1da177e4 | 467 | tcf_bind_filter(tp, &cr.res, base); |
10297b99 | 468 | } |
1da177e4 | 469 | |
bf63ac73 | 470 | if (old_r) |
9b0d4446 | 471 | tcf_exts_change(&r->exts, &e); |
bf63ac73 | 472 | else |
9b0d4446 | 473 | tcf_exts_change(&cr.exts, &e); |
1da177e4 | 474 | |
b9a24bb7 WC |
475 | if (old_r && old_r != r) { |
476 | err = tcindex_filter_result_init(old_r); | |
477 | if (err < 0) { | |
478 | kfree(f); | |
479 | goto errout_alloc; | |
480 | } | |
481 | } | |
1da177e4 | 482 | |
331b7292 | 483 | oldp = p; |
bf63ac73 | 484 | r->res = cr.res; |
331b7292 | 485 | rcu_assign_pointer(tp->root, cp); |
1da177e4 LT |
486 | |
487 | if (r == &new_filter_result) { | |
331b7292 JF |
488 | struct tcindex_filter *nfp; |
489 | struct tcindex_filter __rcu **fp; | |
1da177e4 | 490 | |
9b0d4446 | 491 | tcf_exts_change(&f->result.exts, &r->exts); |
331b7292 | 492 | |
69301eaa | 493 | fp = cp->h + (handle % cp->hash); |
331b7292 JF |
494 | for (nfp = rtnl_dereference(*fp); |
495 | nfp; | |
496 | fp = &nfp->next, nfp = rtnl_dereference(*fp)) | |
497 | ; /* nothing */ | |
498 | ||
499 | rcu_assign_pointer(*fp, f); | |
10297b99 | 500 | } |
1da177e4 | 501 | |
331b7292 JF |
502 | if (oldp) |
503 | call_rcu(&oldp->rcu, __tcindex_partial_destroy); | |
1da177e4 LT |
504 | return 0; |
505 | ||
506 | errout_alloc: | |
507 | if (balloc == 1) | |
b9a24bb7 | 508 | tcindex_free_perfect_hash(cp); |
1da177e4 | 509 | else if (balloc == 2) |
331b7292 | 510 | kfree(cp->h); |
b9a24bb7 WC |
511 | errout1: |
512 | tcf_exts_destroy(&cr.exts); | |
513 | tcf_exts_destroy(&new_filter_result.exts); | |
1da177e4 | 514 | errout: |
331b7292 | 515 | kfree(cp); |
18d0264f | 516 | tcf_exts_destroy(&e); |
1da177e4 LT |
517 | return err; |
518 | } | |
519 | ||
520 | static int | |
c1b52739 | 521 | tcindex_change(struct net *net, struct sk_buff *in_skb, |
af4c6641 | 522 | struct tcf_proto *tp, unsigned long base, u32 handle, |
8113c095 | 523 | struct nlattr **tca, void **arg, bool ovr) |
1da177e4 | 524 | { |
add93b61 PM |
525 | struct nlattr *opt = tca[TCA_OPTIONS]; |
526 | struct nlattr *tb[TCA_TCINDEX_MAX + 1]; | |
331b7292 | 527 | struct tcindex_data *p = rtnl_dereference(tp->root); |
8113c095 | 528 | struct tcindex_filter_result *r = *arg; |
cee63723 | 529 | int err; |
1da177e4 | 530 | |
aa767bfe | 531 | pr_debug("tcindex_change(tp %p,handle 0x%08x,tca %p,arg %p),opt %p," |
8113c095 WC |
532 | "p %p,r %p,*arg %p\n", |
533 | tp, handle, tca, arg, opt, p, r, arg ? *arg : NULL); | |
1da177e4 LT |
534 | |
535 | if (!opt) | |
536 | return 0; | |
537 | ||
fceb6435 | 538 | err = nla_parse_nested(tb, TCA_TCINDEX_MAX, opt, tcindex_policy, NULL); |
cee63723 PM |
539 | if (err < 0) |
540 | return err; | |
1da177e4 | 541 | |
c1b52739 | 542 | return tcindex_set_parms(net, tp, base, handle, p, r, tb, |
2f7ef2f8 | 543 | tca[TCA_RATE], ovr); |
1da177e4 LT |
544 | } |
545 | ||
1da177e4 LT |
546 | static void tcindex_walk(struct tcf_proto *tp, struct tcf_walker *walker) |
547 | { | |
331b7292 | 548 | struct tcindex_data *p = rtnl_dereference(tp->root); |
aa767bfe | 549 | struct tcindex_filter *f, *next; |
1da177e4 LT |
550 | int i; |
551 | ||
aa767bfe | 552 | pr_debug("tcindex_walk(tp %p,walker %p),p %p\n", tp, walker, p); |
1da177e4 LT |
553 | if (p->perfect) { |
554 | for (i = 0; i < p->hash; i++) { | |
555 | if (!p->perfect[i].res.class) | |
556 | continue; | |
557 | if (walker->count >= walker->skip) { | |
8113c095 | 558 | if (walker->fn(tp, p->perfect + i, walker) < 0) { |
1da177e4 LT |
559 | walker->stop = 1; |
560 | return; | |
561 | } | |
562 | } | |
563 | walker->count++; | |
564 | } | |
565 | } | |
566 | if (!p->h) | |
567 | return; | |
568 | for (i = 0; i < p->hash; i++) { | |
331b7292 JF |
569 | for (f = rtnl_dereference(p->h[i]); f; f = next) { |
570 | next = rtnl_dereference(f->next); | |
1da177e4 | 571 | if (walker->count >= walker->skip) { |
8113c095 | 572 | if (walker->fn(tp, &f->result, walker) < 0) { |
1da177e4 LT |
573 | walker->stop = 1; |
574 | return; | |
575 | } | |
576 | } | |
577 | walker->count++; | |
578 | } | |
579 | } | |
580 | } | |
581 | ||
763dbf63 | 582 | static void tcindex_destroy(struct tcf_proto *tp) |
1da177e4 | 583 | { |
331b7292 | 584 | struct tcindex_data *p = rtnl_dereference(tp->root); |
1da177e4 LT |
585 | struct tcf_walker walker; |
586 | ||
aa767bfe | 587 | pr_debug("tcindex_destroy(tp %p),p %p\n", tp, p); |
1da177e4 LT |
588 | walker.count = 0; |
589 | walker.skip = 0; | |
e40f5c72 | 590 | walker.fn = tcindex_destroy_element; |
aa767bfe | 591 | tcindex_walk(tp, &walker); |
331b7292 | 592 | |
331b7292 | 593 | call_rcu(&p->rcu, __tcindex_destroy); |
1da177e4 LT |
594 | } |
595 | ||
596 | ||
8113c095 | 597 | static int tcindex_dump(struct net *net, struct tcf_proto *tp, void *fh, |
5a7a5555 | 598 | struct sk_buff *skb, struct tcmsg *t) |
1da177e4 | 599 | { |
331b7292 | 600 | struct tcindex_data *p = rtnl_dereference(tp->root); |
8113c095 | 601 | struct tcindex_filter_result *r = fh; |
4b3550ef | 602 | struct nlattr *nest; |
1da177e4 | 603 | |
8113c095 | 604 | pr_debug("tcindex_dump(tp %p,fh %p,skb %p,t %p),p %p,r %p\n", |
6ea3b446 | 605 | tp, fh, skb, t, p, r); |
aa767bfe | 606 | pr_debug("p->perfect %p p->h %p\n", p->perfect, p->h); |
4b3550ef PM |
607 | |
608 | nest = nla_nest_start(skb, TCA_OPTIONS); | |
609 | if (nest == NULL) | |
610 | goto nla_put_failure; | |
611 | ||
1da177e4 LT |
612 | if (!fh) { |
613 | t->tcm_handle = ~0; /* whatever ... */ | |
1b34ec43 DM |
614 | if (nla_put_u32(skb, TCA_TCINDEX_HASH, p->hash) || |
615 | nla_put_u16(skb, TCA_TCINDEX_MASK, p->mask) || | |
616 | nla_put_u32(skb, TCA_TCINDEX_SHIFT, p->shift) || | |
617 | nla_put_u32(skb, TCA_TCINDEX_FALL_THROUGH, p->fall_through)) | |
618 | goto nla_put_failure; | |
4b3550ef | 619 | nla_nest_end(skb, nest); |
1da177e4 LT |
620 | } else { |
621 | if (p->perfect) { | |
331b7292 | 622 | t->tcm_handle = r - p->perfect; |
1da177e4 LT |
623 | } else { |
624 | struct tcindex_filter *f; | |
331b7292 | 625 | struct tcindex_filter __rcu **fp; |
1da177e4 LT |
626 | int i; |
627 | ||
628 | t->tcm_handle = 0; | |
629 | for (i = 0; !t->tcm_handle && i < p->hash; i++) { | |
331b7292 JF |
630 | fp = &p->h[i]; |
631 | for (f = rtnl_dereference(*fp); | |
632 | !t->tcm_handle && f; | |
633 | fp = &f->next, f = rtnl_dereference(*fp)) { | |
1da177e4 LT |
634 | if (&f->result == r) |
635 | t->tcm_handle = f->key; | |
636 | } | |
637 | } | |
638 | } | |
aa767bfe | 639 | pr_debug("handle = %d\n", t->tcm_handle); |
1b34ec43 DM |
640 | if (r->res.class && |
641 | nla_put_u32(skb, TCA_TCINDEX_CLASSID, r->res.classid)) | |
642 | goto nla_put_failure; | |
1da177e4 | 643 | |
5da57f42 | 644 | if (tcf_exts_dump(skb, &r->exts) < 0) |
add93b61 | 645 | goto nla_put_failure; |
4b3550ef | 646 | nla_nest_end(skb, nest); |
1da177e4 | 647 | |
5da57f42 | 648 | if (tcf_exts_dump_stats(skb, &r->exts) < 0) |
add93b61 | 649 | goto nla_put_failure; |
1da177e4 | 650 | } |
10297b99 | 651 | |
1da177e4 LT |
652 | return skb->len; |
653 | ||
add93b61 | 654 | nla_put_failure: |
6ea3b446 | 655 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
656 | return -1; |
657 | } | |
658 | ||
07d79fc7 CW |
659 | static void tcindex_bind_class(void *fh, u32 classid, unsigned long cl) |
660 | { | |
661 | struct tcindex_filter_result *r = fh; | |
662 | ||
663 | if (r && r->res.classid == classid) | |
664 | r->res.class = cl; | |
665 | } | |
666 | ||
2eb9d75c | 667 | static struct tcf_proto_ops cls_tcindex_ops __read_mostly = { |
1da177e4 LT |
668 | .kind = "tcindex", |
669 | .classify = tcindex_classify, | |
670 | .init = tcindex_init, | |
671 | .destroy = tcindex_destroy, | |
672 | .get = tcindex_get, | |
1da177e4 LT |
673 | .change = tcindex_change, |
674 | .delete = tcindex_delete, | |
675 | .walk = tcindex_walk, | |
676 | .dump = tcindex_dump, | |
07d79fc7 | 677 | .bind_class = tcindex_bind_class, |
1da177e4 LT |
678 | .owner = THIS_MODULE, |
679 | }; | |
680 | ||
681 | static int __init init_tcindex(void) | |
682 | { | |
683 | return register_tcf_proto_ops(&cls_tcindex_ops); | |
684 | } | |
685 | ||
10297b99 | 686 | static void __exit exit_tcindex(void) |
1da177e4 LT |
687 | { |
688 | unregister_tcf_proto_ops(&cls_tcindex_ops); | |
689 | } | |
690 | ||
691 | module_init(init_tcindex) | |
692 | module_exit(exit_tcindex) | |
693 | MODULE_LICENSE("GPL"); |