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