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; | |
30 | }; | |
31 | ||
32 | struct tcindex_filter { | |
33 | u16 key; | |
34 | struct tcindex_filter_result result; | |
8332904a JF |
35 | struct tcindex_filter __rcu *next; |
36 | struct rcu_head rcu; | |
1da177e4 LT |
37 | }; |
38 | ||
39 | ||
40 | struct tcindex_data { | |
41 | struct tcindex_filter_result *perfect; /* perfect hash; NULL if none */ | |
8332904a JF |
42 | struct tcindex_filter __rcu **h; /* imperfect hash; */ |
43 | struct tcf_proto *tp; | |
1da177e4 | 44 | u16 mask; /* AND key with mask */ |
8332904a JF |
45 | u32 shift; /* shift ANDed key to the right */ |
46 | u32 hash; /* hash table size; 0 if undefined */ | |
47 | u32 alloc_hash; /* allocated size */ | |
48 | u32 fall_through; /* 0: only classify if explicit match */ | |
49 | struct rcu_head rcu; | |
1da177e4 LT |
50 | }; |
51 | ||
1da177e4 LT |
52 | static inline int |
53 | tcindex_filter_is_set(struct tcindex_filter_result *r) | |
54 | { | |
55 | return tcf_exts_is_predicative(&r->exts) || r->res.classid; | |
56 | } | |
57 | ||
58 | static struct tcindex_filter_result * | |
59 | tcindex_lookup(struct tcindex_data *p, u16 key) | |
60 | { | |
8332904a 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 | |
8332904a 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 | { | |
8332904a | 84 | struct tcindex_data *p = rcu_dereference(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 | ||
107 | static unsigned long tcindex_get(struct tcf_proto *tp, u32 handle) | |
108 | { | |
8332904a | 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 LT |
113 | if (p->perfect && handle >= p->alloc_hash) |
114 | return 0; | |
115 | r = tcindex_lookup(p, handle); | |
116 | return r && tcindex_filter_is_set(r) ? (unsigned long) r : 0UL; | |
117 | } | |
118 | ||
119 | ||
120 | static void tcindex_put(struct tcf_proto *tp, unsigned long f) | |
121 | { | |
aa767bfe | 122 | pr_debug("tcindex_put(tp %p,f 0x%lx)\n", tp, f); |
1da177e4 LT |
123 | } |
124 | ||
125 | ||
126 | static int tcindex_init(struct tcf_proto *tp) | |
127 | { | |
128 | struct tcindex_data *p; | |
129 | ||
aa767bfe SH |
130 | pr_debug("tcindex_init(tp %p)\n", tp); |
131 | p = kzalloc(sizeof(struct tcindex_data), GFP_KERNEL); | |
1da177e4 LT |
132 | if (!p) |
133 | return -ENOMEM; | |
134 | ||
1da177e4 LT |
135 | p->mask = 0xffff; |
136 | p->hash = DEFAULT_HASH_SIZE; | |
137 | p->fall_through = 1; | |
138 | ||
8332904a | 139 | rcu_assign_pointer(tp->root, p); |
1da177e4 LT |
140 | return 0; |
141 | } | |
142 | ||
1da177e4 | 143 | static int |
8332904a | 144 | tcindex_delete(struct tcf_proto *tp, unsigned long arg) |
1da177e4 | 145 | { |
8332904a | 146 | struct tcindex_data *p = rtnl_dereference(tp->root); |
1da177e4 | 147 | struct tcindex_filter_result *r = (struct tcindex_filter_result *) arg; |
8332904a | 148 | struct tcindex_filter __rcu **walk; |
1da177e4 LT |
149 | struct tcindex_filter *f = NULL; |
150 | ||
8332904a | 151 | pr_debug("tcindex_delete(tp %p,arg 0x%lx),p %p\n", tp, arg, p); |
1da177e4 LT |
152 | if (p->perfect) { |
153 | if (!r->res.class) | |
154 | return -ENOENT; | |
155 | } else { | |
156 | int i; | |
1da177e4 | 157 | |
8332904a JF |
158 | for (i = 0; i < p->hash; i++) { |
159 | walk = p->h + i; | |
160 | for (f = rtnl_dereference(*walk); f; | |
161 | walk = &f->next, f = rtnl_dereference(*walk)) { | |
162 | if (&f->result == r) | |
1da177e4 | 163 | goto found; |
8332904a JF |
164 | } |
165 | } | |
1da177e4 LT |
166 | return -ENOENT; |
167 | ||
168 | found: | |
8332904a | 169 | rcu_assign_pointer(*walk, rtnl_dereference(f->next)); |
1da177e4 LT |
170 | } |
171 | tcf_unbind_filter(tp, &r->res); | |
172 | tcf_exts_destroy(tp, &r->exts); | |
8332904a JF |
173 | if (f) |
174 | kfree_rcu(f, rcu); | |
1da177e4 LT |
175 | return 0; |
176 | } | |
177 | ||
8332904a JF |
178 | static int tcindex_destroy_element(struct tcf_proto *tp, |
179 | unsigned long arg, | |
180 | struct tcf_walker *walker) | |
1da177e4 | 181 | { |
8332904a JF |
182 | return tcindex_delete(tp, arg); |
183 | } | |
184 | ||
185 | static void __tcindex_destroy(struct rcu_head *head) | |
186 | { | |
187 | struct tcindex_data *p = container_of(head, struct tcindex_data, rcu); | |
188 | ||
189 | kfree(p->perfect); | |
190 | kfree(p->h); | |
191 | kfree(p); | |
1da177e4 LT |
192 | } |
193 | ||
194 | static inline int | |
195 | valid_perfect_hash(struct tcindex_data *p) | |
196 | { | |
197 | return p->hash > (p->mask >> p->shift); | |
198 | } | |
199 | ||
6fa8c014 PM |
200 | static const struct nla_policy tcindex_policy[TCA_TCINDEX_MAX + 1] = { |
201 | [TCA_TCINDEX_HASH] = { .type = NLA_U32 }, | |
202 | [TCA_TCINDEX_MASK] = { .type = NLA_U16 }, | |
203 | [TCA_TCINDEX_SHIFT] = { .type = NLA_U32 }, | |
204 | [TCA_TCINDEX_FALL_THROUGH] = { .type = NLA_U32 }, | |
205 | [TCA_TCINDEX_CLASSID] = { .type = NLA_U32 }, | |
206 | }; | |
207 | ||
bf63ac73 CW |
208 | static void tcindex_filter_result_init(struct tcindex_filter_result *r) |
209 | { | |
210 | memset(r, 0, sizeof(*r)); | |
211 | tcf_exts_init(&r->exts, TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE); | |
212 | } | |
213 | ||
8332904a JF |
214 | static void __tcindex_partial_destroy(struct rcu_head *head) |
215 | { | |
216 | struct tcindex_data *p = container_of(head, struct tcindex_data, rcu); | |
217 | ||
218 | kfree(p->perfect); | |
219 | kfree(p); | |
220 | } | |
221 | ||
1da177e4 | 222 | static int |
c1b52739 BL |
223 | tcindex_set_parms(struct net *net, struct tcf_proto *tp, unsigned long base, |
224 | u32 handle, struct tcindex_data *p, | |
225 | struct tcindex_filter_result *r, struct nlattr **tb, | |
2f7ef2f8 | 226 | struct nlattr *est, bool ovr) |
1da177e4 LT |
227 | { |
228 | int err, balloc = 0; | |
229 | struct tcindex_filter_result new_filter_result, *old_r = r; | |
230 | struct tcindex_filter_result cr; | |
8332904a | 231 | struct tcindex_data *cp, *oldp; |
1da177e4 LT |
232 | struct tcindex_filter *f = NULL; /* make gcc behave */ |
233 | struct tcf_exts e; | |
234 | ||
5da57f42 | 235 | tcf_exts_init(&e, TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE); |
2f7ef2f8 | 236 | err = tcf_exts_validate(net, tp, tb, est, &e, ovr); |
1da177e4 LT |
237 | if (err < 0) |
238 | return err; | |
10297b99 | 239 | |
8332904a JF |
240 | /* tcindex_data attributes must look atomic to classifier/lookup so |
241 | * allocate new tcindex data and RCU assign it onto root. Keeping | |
242 | * perfect hash and hash pointers from old data. | |
243 | */ | |
244 | cp = kzalloc(sizeof(cp), GFP_KERNEL); | |
245 | if (!cp) | |
246 | return -ENOMEM; | |
247 | ||
248 | cp->mask = p->mask; | |
249 | cp->shift = p->shift; | |
250 | cp->hash = p->hash; | |
251 | cp->alloc_hash = p->alloc_hash; | |
252 | cp->fall_through = p->fall_through; | |
253 | cp->tp = tp; | |
254 | ||
255 | if (p->perfect) { | |
256 | cp->perfect = kmemdup(p->perfect, | |
257 | sizeof(*r) * cp->hash, GFP_KERNEL); | |
258 | if (!cp->perfect) | |
259 | goto errout; | |
260 | } | |
261 | cp->h = p->h; | |
262 | ||
263 | memset(&new_filter_result, 0, sizeof(new_filter_result)); | |
264 | tcf_exts_init(&new_filter_result.exts, | |
265 | TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE); | |
1da177e4 | 266 | |
bf63ac73 | 267 | tcindex_filter_result_init(&cr); |
1da177e4 | 268 | if (old_r) |
bf63ac73 | 269 | cr.res = r->res; |
1da177e4 | 270 | |
6fa8c014 | 271 | if (tb[TCA_TCINDEX_HASH]) |
8332904a | 272 | cp->hash = nla_get_u32(tb[TCA_TCINDEX_HASH]); |
1da177e4 | 273 | |
6fa8c014 | 274 | if (tb[TCA_TCINDEX_MASK]) |
8332904a | 275 | cp->mask = nla_get_u16(tb[TCA_TCINDEX_MASK]); |
1da177e4 | 276 | |
6fa8c014 | 277 | if (tb[TCA_TCINDEX_SHIFT]) |
8332904a | 278 | cp->shift = nla_get_u32(tb[TCA_TCINDEX_SHIFT]); |
1da177e4 LT |
279 | |
280 | err = -EBUSY; | |
8332904a | 281 | |
1da177e4 LT |
282 | /* Hash already allocated, make sure that we still meet the |
283 | * requirements for the allocated hash. | |
284 | */ | |
8332904a JF |
285 | if (cp->perfect) { |
286 | if (!valid_perfect_hash(cp) || | |
287 | cp->hash > cp->alloc_hash) | |
1da177e4 | 288 | goto errout; |
8332904a | 289 | } else if (cp->h && cp->hash != cp->alloc_hash) { |
1da177e4 | 290 | goto errout; |
8332904a | 291 | } |
1da177e4 LT |
292 | |
293 | err = -EINVAL; | |
6fa8c014 | 294 | if (tb[TCA_TCINDEX_FALL_THROUGH]) |
8332904a | 295 | cp->fall_through = nla_get_u32(tb[TCA_TCINDEX_FALL_THROUGH]); |
1da177e4 | 296 | |
8332904a | 297 | if (!cp->hash) { |
1da177e4 LT |
298 | /* Hash not specified, use perfect hash if the upper limit |
299 | * of the hashing index is below the threshold. | |
300 | */ | |
8332904a JF |
301 | if ((cp->mask >> cp->shift) < PERFECT_HASH_THRESHOLD) |
302 | cp->hash = (cp->mask >> cp->shift) + 1; | |
1da177e4 | 303 | else |
8332904a | 304 | cp->hash = DEFAULT_HASH_SIZE; |
1da177e4 LT |
305 | } |
306 | ||
8332904a JF |
307 | if (!cp->perfect && cp->h) |
308 | cp->alloc_hash = cp->hash; | |
1da177e4 LT |
309 | |
310 | /* Note: this could be as restrictive as if (handle & ~(mask >> shift)) | |
311 | * but then, we'd fail handles that may become valid after some future | |
312 | * mask change. While this is extremely unlikely to ever matter, | |
313 | * the check below is safer (and also more backwards-compatible). | |
314 | */ | |
8332904a JF |
315 | if (cp->perfect || valid_perfect_hash(cp)) |
316 | if (handle >= cp->alloc_hash) | |
1da177e4 LT |
317 | goto errout; |
318 | ||
319 | ||
320 | err = -ENOMEM; | |
8332904a JF |
321 | if (!cp->perfect && !cp->h) { |
322 | if (valid_perfect_hash(cp)) { | |
bf63ac73 CW |
323 | int i; |
324 | ||
8332904a JF |
325 | cp->perfect = kcalloc(cp->hash, sizeof(*r), GFP_KERNEL); |
326 | if (!cp->perfect) | |
1da177e4 | 327 | goto errout; |
8332904a JF |
328 | for (i = 0; i < cp->hash; i++) |
329 | tcf_exts_init(&cp->perfect[i].exts, | |
330 | TCA_TCINDEX_ACT, | |
bf63ac73 | 331 | TCA_TCINDEX_POLICE); |
1da177e4 LT |
332 | balloc = 1; |
333 | } else { | |
8332904a JF |
334 | struct tcindex_filter __rcu **hash; |
335 | ||
336 | hash = kcalloc(cp->hash, | |
337 | sizeof(struct tcindex_filter *), | |
338 | GFP_KERNEL); | |
339 | ||
340 | if (!hash) | |
1da177e4 | 341 | goto errout; |
8332904a JF |
342 | |
343 | cp->h = hash; | |
1da177e4 LT |
344 | balloc = 2; |
345 | } | |
346 | } | |
347 | ||
8332904a JF |
348 | if (cp->perfect) |
349 | r = cp->perfect + handle; | |
1da177e4 | 350 | else |
8332904a | 351 | r = tcindex_lookup(cp, handle) ? : &new_filter_result; |
1da177e4 LT |
352 | |
353 | if (r == &new_filter_result) { | |
0da974f4 | 354 | f = kzalloc(sizeof(*f), GFP_KERNEL); |
1da177e4 LT |
355 | if (!f) |
356 | goto errout_alloc; | |
10297b99 | 357 | } |
1da177e4 | 358 | |
add93b61 | 359 | if (tb[TCA_TCINDEX_CLASSID]) { |
1587bac4 | 360 | cr.res.classid = nla_get_u32(tb[TCA_TCINDEX_CLASSID]); |
1da177e4 | 361 | tcf_bind_filter(tp, &cr.res, base); |
10297b99 | 362 | } |
1da177e4 | 363 | |
bf63ac73 CW |
364 | if (old_r) |
365 | tcf_exts_change(tp, &r->exts, &e); | |
366 | else | |
367 | tcf_exts_change(tp, &cr.exts, &e); | |
1da177e4 | 368 | |
1da177e4 | 369 | if (old_r && old_r != r) |
bf63ac73 | 370 | tcindex_filter_result_init(old_r); |
1da177e4 | 371 | |
8332904a | 372 | oldp = p; |
bf63ac73 | 373 | r->res = cr.res; |
8332904a | 374 | rcu_assign_pointer(tp->root, cp); |
1da177e4 LT |
375 | |
376 | if (r == &new_filter_result) { | |
8332904a JF |
377 | struct tcindex_filter *nfp; |
378 | struct tcindex_filter __rcu **fp; | |
1da177e4 LT |
379 | |
380 | f->key = handle; | |
381 | f->result = new_filter_result; | |
382 | f->next = NULL; | |
8332904a JF |
383 | |
384 | fp = p->h + (handle % p->hash); | |
385 | for (nfp = rtnl_dereference(*fp); | |
386 | nfp; | |
387 | fp = &nfp->next, nfp = rtnl_dereference(*fp)) | |
388 | ; /* nothing */ | |
389 | ||
390 | rcu_assign_pointer(*fp, f); | |
10297b99 | 391 | } |
1da177e4 | 392 | |
8332904a JF |
393 | if (oldp) |
394 | call_rcu(&oldp->rcu, __tcindex_partial_destroy); | |
1da177e4 LT |
395 | return 0; |
396 | ||
397 | errout_alloc: | |
398 | if (balloc == 1) | |
8332904a | 399 | kfree(cp->perfect); |
1da177e4 | 400 | else if (balloc == 2) |
8332904a | 401 | kfree(cp->h); |
1da177e4 | 402 | errout: |
8332904a | 403 | kfree(cp); |
1da177e4 LT |
404 | tcf_exts_destroy(tp, &e); |
405 | return err; | |
406 | } | |
407 | ||
408 | static int | |
c1b52739 | 409 | tcindex_change(struct net *net, struct sk_buff *in_skb, |
af4c6641 | 410 | struct tcf_proto *tp, unsigned long base, u32 handle, |
2f7ef2f8 | 411 | struct nlattr **tca, unsigned long *arg, bool ovr) |
1da177e4 | 412 | { |
add93b61 PM |
413 | struct nlattr *opt = tca[TCA_OPTIONS]; |
414 | struct nlattr *tb[TCA_TCINDEX_MAX + 1]; | |
8332904a | 415 | struct tcindex_data *p = rtnl_dereference(tp->root); |
1da177e4 | 416 | struct tcindex_filter_result *r = (struct tcindex_filter_result *) *arg; |
cee63723 | 417 | int err; |
1da177e4 | 418 | |
aa767bfe | 419 | pr_debug("tcindex_change(tp %p,handle 0x%08x,tca %p,arg %p),opt %p," |
1da177e4 LT |
420 | "p %p,r %p,*arg 0x%lx\n", |
421 | tp, handle, tca, arg, opt, p, r, arg ? *arg : 0L); | |
422 | ||
423 | if (!opt) | |
424 | return 0; | |
425 | ||
6fa8c014 | 426 | err = nla_parse_nested(tb, TCA_TCINDEX_MAX, opt, tcindex_policy); |
cee63723 PM |
427 | if (err < 0) |
428 | return err; | |
1da177e4 | 429 | |
c1b52739 | 430 | return tcindex_set_parms(net, tp, base, handle, p, r, tb, |
2f7ef2f8 | 431 | tca[TCA_RATE], ovr); |
1da177e4 LT |
432 | } |
433 | ||
1da177e4 LT |
434 | static void tcindex_walk(struct tcf_proto *tp, struct tcf_walker *walker) |
435 | { | |
8332904a | 436 | struct tcindex_data *p = rtnl_dereference(tp->root); |
aa767bfe | 437 | struct tcindex_filter *f, *next; |
1da177e4 LT |
438 | int i; |
439 | ||
aa767bfe | 440 | pr_debug("tcindex_walk(tp %p,walker %p),p %p\n", tp, walker, p); |
1da177e4 LT |
441 | if (p->perfect) { |
442 | for (i = 0; i < p->hash; i++) { | |
443 | if (!p->perfect[i].res.class) | |
444 | continue; | |
445 | if (walker->count >= walker->skip) { | |
446 | if (walker->fn(tp, | |
447 | (unsigned long) (p->perfect+i), walker) | |
448 | < 0) { | |
449 | walker->stop = 1; | |
450 | return; | |
451 | } | |
452 | } | |
453 | walker->count++; | |
454 | } | |
455 | } | |
456 | if (!p->h) | |
457 | return; | |
458 | for (i = 0; i < p->hash; i++) { | |
8332904a JF |
459 | for (f = rtnl_dereference(p->h[i]); f; f = next) { |
460 | next = rtnl_dereference(f->next); | |
1da177e4 | 461 | if (walker->count >= walker->skip) { |
aa767bfe | 462 | if (walker->fn(tp, (unsigned long) &f->result, |
1da177e4 LT |
463 | walker) < 0) { |
464 | walker->stop = 1; | |
465 | return; | |
466 | } | |
467 | } | |
468 | walker->count++; | |
469 | } | |
470 | } | |
471 | } | |
472 | ||
1da177e4 LT |
473 | static void tcindex_destroy(struct tcf_proto *tp) |
474 | { | |
8332904a | 475 | struct tcindex_data *p = rtnl_dereference(tp->root); |
1da177e4 LT |
476 | struct tcf_walker walker; |
477 | ||
aa767bfe | 478 | pr_debug("tcindex_destroy(tp %p),p %p\n", tp, p); |
1da177e4 LT |
479 | walker.count = 0; |
480 | walker.skip = 0; | |
e40f5c72 | 481 | walker.fn = tcindex_destroy_element; |
aa767bfe | 482 | tcindex_walk(tp, &walker); |
8332904a JF |
483 | |
484 | RCU_INIT_POINTER(tp->root, NULL); | |
485 | call_rcu(&p->rcu, __tcindex_destroy); | |
1da177e4 LT |
486 | } |
487 | ||
488 | ||
832d1d5b | 489 | static int tcindex_dump(struct net *net, struct tcf_proto *tp, unsigned long fh, |
1da177e4 LT |
490 | struct sk_buff *skb, struct tcmsg *t) |
491 | { | |
8332904a | 492 | struct tcindex_data *p = rtnl_dereference(tp->root); |
1da177e4 | 493 | struct tcindex_filter_result *r = (struct tcindex_filter_result *) fh; |
27a884dc | 494 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 495 | struct nlattr *nest; |
1da177e4 | 496 | |
aa767bfe SH |
497 | pr_debug("tcindex_dump(tp %p,fh 0x%lx,skb %p,t %p),p %p,r %p,b %p\n", |
498 | tp, fh, skb, t, p, r, b); | |
499 | pr_debug("p->perfect %p p->h %p\n", p->perfect, p->h); | |
4b3550ef PM |
500 | |
501 | nest = nla_nest_start(skb, TCA_OPTIONS); | |
502 | if (nest == NULL) | |
503 | goto nla_put_failure; | |
504 | ||
1da177e4 LT |
505 | if (!fh) { |
506 | t->tcm_handle = ~0; /* whatever ... */ | |
1b34ec43 DM |
507 | if (nla_put_u32(skb, TCA_TCINDEX_HASH, p->hash) || |
508 | nla_put_u16(skb, TCA_TCINDEX_MASK, p->mask) || | |
509 | nla_put_u32(skb, TCA_TCINDEX_SHIFT, p->shift) || | |
510 | nla_put_u32(skb, TCA_TCINDEX_FALL_THROUGH, p->fall_through)) | |
511 | goto nla_put_failure; | |
4b3550ef | 512 | nla_nest_end(skb, nest); |
1da177e4 LT |
513 | } else { |
514 | if (p->perfect) { | |
8332904a | 515 | t->tcm_handle = r - p->perfect; |
1da177e4 LT |
516 | } else { |
517 | struct tcindex_filter *f; | |
8332904a | 518 | struct tcindex_filter __rcu **fp; |
1da177e4 LT |
519 | int i; |
520 | ||
521 | t->tcm_handle = 0; | |
522 | for (i = 0; !t->tcm_handle && i < p->hash; i++) { | |
8332904a JF |
523 | fp = &p->h[i]; |
524 | for (f = rtnl_dereference(*fp); | |
525 | !t->tcm_handle && f; | |
526 | fp = &f->next, f = rtnl_dereference(*fp)) { | |
1da177e4 LT |
527 | if (&f->result == r) |
528 | t->tcm_handle = f->key; | |
529 | } | |
530 | } | |
531 | } | |
aa767bfe | 532 | pr_debug("handle = %d\n", t->tcm_handle); |
1b34ec43 DM |
533 | if (r->res.class && |
534 | nla_put_u32(skb, TCA_TCINDEX_CLASSID, r->res.classid)) | |
535 | goto nla_put_failure; | |
1da177e4 | 536 | |
5da57f42 | 537 | if (tcf_exts_dump(skb, &r->exts) < 0) |
add93b61 | 538 | goto nla_put_failure; |
4b3550ef | 539 | nla_nest_end(skb, nest); |
1da177e4 | 540 | |
5da57f42 | 541 | if (tcf_exts_dump_stats(skb, &r->exts) < 0) |
add93b61 | 542 | goto nla_put_failure; |
1da177e4 | 543 | } |
10297b99 | 544 | |
1da177e4 LT |
545 | return skb->len; |
546 | ||
add93b61 | 547 | nla_put_failure: |
dc5fc579 | 548 | nlmsg_trim(skb, b); |
1da177e4 LT |
549 | return -1; |
550 | } | |
551 | ||
2eb9d75c | 552 | static struct tcf_proto_ops cls_tcindex_ops __read_mostly = { |
1da177e4 LT |
553 | .kind = "tcindex", |
554 | .classify = tcindex_classify, | |
555 | .init = tcindex_init, | |
556 | .destroy = tcindex_destroy, | |
557 | .get = tcindex_get, | |
558 | .put = tcindex_put, | |
559 | .change = tcindex_change, | |
560 | .delete = tcindex_delete, | |
561 | .walk = tcindex_walk, | |
562 | .dump = tcindex_dump, | |
563 | .owner = THIS_MODULE, | |
564 | }; | |
565 | ||
566 | static int __init init_tcindex(void) | |
567 | { | |
568 | return register_tcf_proto_ops(&cls_tcindex_ops); | |
569 | } | |
570 | ||
10297b99 | 571 | static void __exit exit_tcindex(void) |
1da177e4 LT |
572 | { |
573 | unregister_tcf_proto_ops(&cls_tcindex_ops); | |
574 | } | |
575 | ||
576 | module_init(init_tcindex) | |
577 | module_exit(exit_tcindex) | |
578 | MODULE_LICENSE("GPL"); |