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; | |
331b7292 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 */ | |
331b7292 JF |
42 | struct tcindex_filter __rcu **h; /* imperfect hash; */ |
43 | struct tcf_proto *tp; | |
1da177e4 | 44 | u16 mask; /* AND key with mask */ |
331b7292 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 | { | |
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 | ||
107 | static unsigned long tcindex_get(struct tcf_proto *tp, u32 handle) | |
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 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 | ||
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 | ||
1da177e4 | 136 | static int |
331b7292 | 137 | tcindex_delete(struct tcf_proto *tp, unsigned long arg) |
1da177e4 | 138 | { |
331b7292 | 139 | struct tcindex_data *p = rtnl_dereference(tp->root); |
1da177e4 | 140 | struct tcindex_filter_result *r = (struct tcindex_filter_result *) arg; |
331b7292 | 141 | struct tcindex_filter __rcu **walk; |
1da177e4 LT |
142 | struct tcindex_filter *f = NULL; |
143 | ||
331b7292 | 144 | pr_debug("tcindex_delete(tp %p,arg 0x%lx),p %p\n", tp, arg, p); |
1da177e4 LT |
145 | if (p->perfect) { |
146 | if (!r->res.class) | |
147 | return -ENOENT; | |
148 | } else { | |
149 | int i; | |
1da177e4 | 150 | |
331b7292 JF |
151 | for (i = 0; i < p->hash; i++) { |
152 | walk = p->h + i; | |
153 | for (f = rtnl_dereference(*walk); f; | |
154 | walk = &f->next, f = rtnl_dereference(*walk)) { | |
155 | if (&f->result == r) | |
1da177e4 | 156 | goto found; |
331b7292 JF |
157 | } |
158 | } | |
1da177e4 LT |
159 | return -ENOENT; |
160 | ||
161 | found: | |
331b7292 | 162 | rcu_assign_pointer(*walk, rtnl_dereference(f->next)); |
1da177e4 LT |
163 | } |
164 | tcf_unbind_filter(tp, &r->res); | |
18d0264f | 165 | tcf_exts_destroy(&r->exts); |
331b7292 JF |
166 | if (f) |
167 | kfree_rcu(f, rcu); | |
1da177e4 LT |
168 | return 0; |
169 | } | |
170 | ||
331b7292 JF |
171 | static int tcindex_destroy_element(struct tcf_proto *tp, |
172 | unsigned long arg, | |
173 | struct tcf_walker *walker) | |
1da177e4 | 174 | { |
331b7292 JF |
175 | return tcindex_delete(tp, arg); |
176 | } | |
177 | ||
178 | static void __tcindex_destroy(struct rcu_head *head) | |
179 | { | |
180 | struct tcindex_data *p = container_of(head, struct tcindex_data, rcu); | |
181 | ||
182 | kfree(p->perfect); | |
183 | kfree(p->h); | |
184 | kfree(p); | |
1da177e4 LT |
185 | } |
186 | ||
187 | static inline int | |
188 | valid_perfect_hash(struct tcindex_data *p) | |
189 | { | |
190 | return p->hash > (p->mask >> p->shift); | |
191 | } | |
192 | ||
6fa8c014 PM |
193 | static const struct nla_policy tcindex_policy[TCA_TCINDEX_MAX + 1] = { |
194 | [TCA_TCINDEX_HASH] = { .type = NLA_U32 }, | |
195 | [TCA_TCINDEX_MASK] = { .type = NLA_U16 }, | |
196 | [TCA_TCINDEX_SHIFT] = { .type = NLA_U32 }, | |
197 | [TCA_TCINDEX_FALL_THROUGH] = { .type = NLA_U32 }, | |
198 | [TCA_TCINDEX_CLASSID] = { .type = NLA_U32 }, | |
199 | }; | |
200 | ||
bf63ac73 CW |
201 | static void tcindex_filter_result_init(struct tcindex_filter_result *r) |
202 | { | |
203 | memset(r, 0, sizeof(*r)); | |
204 | tcf_exts_init(&r->exts, TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE); | |
205 | } | |
206 | ||
331b7292 JF |
207 | static void __tcindex_partial_destroy(struct rcu_head *head) |
208 | { | |
209 | struct tcindex_data *p = container_of(head, struct tcindex_data, rcu); | |
210 | ||
211 | kfree(p->perfect); | |
212 | kfree(p); | |
213 | } | |
214 | ||
1da177e4 | 215 | static int |
c1b52739 BL |
216 | tcindex_set_parms(struct net *net, struct tcf_proto *tp, unsigned long base, |
217 | u32 handle, struct tcindex_data *p, | |
218 | struct tcindex_filter_result *r, struct nlattr **tb, | |
2f7ef2f8 | 219 | struct nlattr *est, bool ovr) |
1da177e4 LT |
220 | { |
221 | int err, balloc = 0; | |
222 | struct tcindex_filter_result new_filter_result, *old_r = r; | |
223 | struct tcindex_filter_result cr; | |
331b7292 | 224 | struct tcindex_data *cp, *oldp; |
1da177e4 LT |
225 | struct tcindex_filter *f = NULL; /* make gcc behave */ |
226 | struct tcf_exts e; | |
227 | ||
5da57f42 | 228 | tcf_exts_init(&e, TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE); |
2f7ef2f8 | 229 | err = tcf_exts_validate(net, tp, tb, est, &e, ovr); |
1da177e4 LT |
230 | if (err < 0) |
231 | return err; | |
10297b99 | 232 | |
02c5e844 | 233 | err = -ENOMEM; |
331b7292 JF |
234 | /* tcindex_data attributes must look atomic to classifier/lookup so |
235 | * allocate new tcindex data and RCU assign it onto root. Keeping | |
236 | * perfect hash and hash pointers from old data. | |
237 | */ | |
a57a65ba | 238 | cp = kzalloc(sizeof(*cp), GFP_KERNEL); |
02c5e844 | 239 | if (!cp) |
44b75e43 | 240 | goto errout; |
331b7292 JF |
241 | |
242 | cp->mask = p->mask; | |
243 | cp->shift = p->shift; | |
244 | cp->hash = p->hash; | |
245 | cp->alloc_hash = p->alloc_hash; | |
246 | cp->fall_through = p->fall_through; | |
247 | cp->tp = tp; | |
248 | ||
249 | if (p->perfect) { | |
6e056569 WC |
250 | int i; |
251 | ||
331b7292 JF |
252 | cp->perfect = kmemdup(p->perfect, |
253 | sizeof(*r) * cp->hash, GFP_KERNEL); | |
254 | if (!cp->perfect) | |
255 | goto errout; | |
6e056569 WC |
256 | for (i = 0; i < cp->hash; i++) |
257 | tcf_exts_init(&cp->perfect[i].exts, | |
258 | TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE); | |
44b75e43 | 259 | balloc = 1; |
331b7292 JF |
260 | } |
261 | cp->h = p->h; | |
262 | ||
10ee1c34 | 263 | tcindex_filter_result_init(&new_filter_result); |
bf63ac73 | 264 | tcindex_filter_result_init(&cr); |
1da177e4 | 265 | if (old_r) |
bf63ac73 | 266 | cr.res = r->res; |
1da177e4 | 267 | |
6fa8c014 | 268 | if (tb[TCA_TCINDEX_HASH]) |
331b7292 | 269 | cp->hash = nla_get_u32(tb[TCA_TCINDEX_HASH]); |
1da177e4 | 270 | |
6fa8c014 | 271 | if (tb[TCA_TCINDEX_MASK]) |
331b7292 | 272 | cp->mask = nla_get_u16(tb[TCA_TCINDEX_MASK]); |
1da177e4 | 273 | |
6fa8c014 | 274 | if (tb[TCA_TCINDEX_SHIFT]) |
331b7292 | 275 | cp->shift = nla_get_u32(tb[TCA_TCINDEX_SHIFT]); |
1da177e4 LT |
276 | |
277 | err = -EBUSY; | |
331b7292 | 278 | |
1da177e4 LT |
279 | /* Hash already allocated, make sure that we still meet the |
280 | * requirements for the allocated hash. | |
281 | */ | |
331b7292 JF |
282 | if (cp->perfect) { |
283 | if (!valid_perfect_hash(cp) || | |
284 | cp->hash > cp->alloc_hash) | |
44b75e43 | 285 | goto errout_alloc; |
331b7292 | 286 | } else if (cp->h && cp->hash != cp->alloc_hash) { |
44b75e43 | 287 | goto errout_alloc; |
331b7292 | 288 | } |
1da177e4 LT |
289 | |
290 | err = -EINVAL; | |
6fa8c014 | 291 | if (tb[TCA_TCINDEX_FALL_THROUGH]) |
331b7292 | 292 | cp->fall_through = nla_get_u32(tb[TCA_TCINDEX_FALL_THROUGH]); |
1da177e4 | 293 | |
331b7292 | 294 | if (!cp->hash) { |
1da177e4 LT |
295 | /* Hash not specified, use perfect hash if the upper limit |
296 | * of the hashing index is below the threshold. | |
297 | */ | |
331b7292 JF |
298 | if ((cp->mask >> cp->shift) < PERFECT_HASH_THRESHOLD) |
299 | cp->hash = (cp->mask >> cp->shift) + 1; | |
1da177e4 | 300 | else |
331b7292 | 301 | cp->hash = DEFAULT_HASH_SIZE; |
1da177e4 LT |
302 | } |
303 | ||
68f6a7c6 | 304 | if (!cp->perfect && !cp->h) |
331b7292 | 305 | cp->alloc_hash = cp->hash; |
1da177e4 LT |
306 | |
307 | /* Note: this could be as restrictive as if (handle & ~(mask >> shift)) | |
308 | * but then, we'd fail handles that may become valid after some future | |
309 | * mask change. While this is extremely unlikely to ever matter, | |
310 | * the check below is safer (and also more backwards-compatible). | |
311 | */ | |
331b7292 JF |
312 | if (cp->perfect || valid_perfect_hash(cp)) |
313 | if (handle >= cp->alloc_hash) | |
44b75e43 | 314 | goto errout_alloc; |
1da177e4 LT |
315 | |
316 | ||
317 | err = -ENOMEM; | |
331b7292 JF |
318 | if (!cp->perfect && !cp->h) { |
319 | if (valid_perfect_hash(cp)) { | |
bf63ac73 CW |
320 | int i; |
321 | ||
331b7292 JF |
322 | cp->perfect = kcalloc(cp->hash, sizeof(*r), GFP_KERNEL); |
323 | if (!cp->perfect) | |
44b75e43 | 324 | goto errout_alloc; |
331b7292 JF |
325 | for (i = 0; i < cp->hash; i++) |
326 | tcf_exts_init(&cp->perfect[i].exts, | |
327 | TCA_TCINDEX_ACT, | |
bf63ac73 | 328 | TCA_TCINDEX_POLICE); |
1da177e4 LT |
329 | balloc = 1; |
330 | } else { | |
331b7292 JF |
331 | struct tcindex_filter __rcu **hash; |
332 | ||
333 | hash = kcalloc(cp->hash, | |
334 | sizeof(struct tcindex_filter *), | |
335 | GFP_KERNEL); | |
336 | ||
337 | if (!hash) | |
44b75e43 | 338 | goto errout_alloc; |
331b7292 JF |
339 | |
340 | cp->h = hash; | |
1da177e4 LT |
341 | balloc = 2; |
342 | } | |
343 | } | |
344 | ||
331b7292 JF |
345 | if (cp->perfect) |
346 | r = cp->perfect + handle; | |
1da177e4 | 347 | else |
331b7292 | 348 | r = tcindex_lookup(cp, handle) ? : &new_filter_result; |
1da177e4 LT |
349 | |
350 | if (r == &new_filter_result) { | |
0da974f4 | 351 | f = kzalloc(sizeof(*f), GFP_KERNEL); |
1da177e4 LT |
352 | if (!f) |
353 | goto errout_alloc; | |
6e056569 WC |
354 | f->key = handle; |
355 | tcindex_filter_result_init(&f->result); | |
356 | f->next = NULL; | |
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 | |
331b7292 | 372 | oldp = p; |
bf63ac73 | 373 | r->res = cr.res; |
331b7292 | 374 | rcu_assign_pointer(tp->root, cp); |
1da177e4 LT |
375 | |
376 | if (r == &new_filter_result) { | |
331b7292 JF |
377 | struct tcindex_filter *nfp; |
378 | struct tcindex_filter __rcu **fp; | |
1da177e4 | 379 | |
6e056569 | 380 | tcf_exts_change(tp, &f->result.exts, &r->exts); |
331b7292 | 381 | |
69301eaa | 382 | fp = cp->h + (handle % cp->hash); |
331b7292 JF |
383 | for (nfp = rtnl_dereference(*fp); |
384 | nfp; | |
385 | fp = &nfp->next, nfp = rtnl_dereference(*fp)) | |
386 | ; /* nothing */ | |
387 | ||
388 | rcu_assign_pointer(*fp, f); | |
10297b99 | 389 | } |
1da177e4 | 390 | |
331b7292 JF |
391 | if (oldp) |
392 | call_rcu(&oldp->rcu, __tcindex_partial_destroy); | |
1da177e4 LT |
393 | return 0; |
394 | ||
395 | errout_alloc: | |
396 | if (balloc == 1) | |
331b7292 | 397 | kfree(cp->perfect); |
1da177e4 | 398 | else if (balloc == 2) |
331b7292 | 399 | kfree(cp->h); |
1da177e4 | 400 | errout: |
331b7292 | 401 | kfree(cp); |
18d0264f | 402 | tcf_exts_destroy(&e); |
1da177e4 LT |
403 | return err; |
404 | } | |
405 | ||
406 | static int | |
c1b52739 | 407 | tcindex_change(struct net *net, struct sk_buff *in_skb, |
af4c6641 | 408 | struct tcf_proto *tp, unsigned long base, u32 handle, |
2f7ef2f8 | 409 | struct nlattr **tca, unsigned long *arg, bool ovr) |
1da177e4 | 410 | { |
add93b61 PM |
411 | struct nlattr *opt = tca[TCA_OPTIONS]; |
412 | struct nlattr *tb[TCA_TCINDEX_MAX + 1]; | |
331b7292 | 413 | struct tcindex_data *p = rtnl_dereference(tp->root); |
1da177e4 | 414 | struct tcindex_filter_result *r = (struct tcindex_filter_result *) *arg; |
cee63723 | 415 | int err; |
1da177e4 | 416 | |
aa767bfe | 417 | pr_debug("tcindex_change(tp %p,handle 0x%08x,tca %p,arg %p),opt %p," |
1da177e4 LT |
418 | "p %p,r %p,*arg 0x%lx\n", |
419 | tp, handle, tca, arg, opt, p, r, arg ? *arg : 0L); | |
420 | ||
421 | if (!opt) | |
422 | return 0; | |
423 | ||
6fa8c014 | 424 | err = nla_parse_nested(tb, TCA_TCINDEX_MAX, opt, tcindex_policy); |
cee63723 PM |
425 | if (err < 0) |
426 | return err; | |
1da177e4 | 427 | |
c1b52739 | 428 | return tcindex_set_parms(net, tp, base, handle, p, r, tb, |
2f7ef2f8 | 429 | tca[TCA_RATE], ovr); |
1da177e4 LT |
430 | } |
431 | ||
1da177e4 LT |
432 | static void tcindex_walk(struct tcf_proto *tp, struct tcf_walker *walker) |
433 | { | |
331b7292 | 434 | struct tcindex_data *p = rtnl_dereference(tp->root); |
aa767bfe | 435 | struct tcindex_filter *f, *next; |
1da177e4 LT |
436 | int i; |
437 | ||
aa767bfe | 438 | pr_debug("tcindex_walk(tp %p,walker %p),p %p\n", tp, walker, p); |
1da177e4 LT |
439 | if (p->perfect) { |
440 | for (i = 0; i < p->hash; i++) { | |
441 | if (!p->perfect[i].res.class) | |
442 | continue; | |
443 | if (walker->count >= walker->skip) { | |
444 | if (walker->fn(tp, | |
445 | (unsigned long) (p->perfect+i), walker) | |
446 | < 0) { | |
447 | walker->stop = 1; | |
448 | return; | |
449 | } | |
450 | } | |
451 | walker->count++; | |
452 | } | |
453 | } | |
454 | if (!p->h) | |
455 | return; | |
456 | for (i = 0; i < p->hash; i++) { | |
331b7292 JF |
457 | for (f = rtnl_dereference(p->h[i]); f; f = next) { |
458 | next = rtnl_dereference(f->next); | |
1da177e4 | 459 | if (walker->count >= walker->skip) { |
aa767bfe | 460 | if (walker->fn(tp, (unsigned long) &f->result, |
1da177e4 LT |
461 | walker) < 0) { |
462 | walker->stop = 1; | |
463 | return; | |
464 | } | |
465 | } | |
466 | walker->count++; | |
467 | } | |
468 | } | |
469 | } | |
470 | ||
1e052be6 | 471 | static bool tcindex_destroy(struct tcf_proto *tp, bool force) |
1da177e4 | 472 | { |
331b7292 | 473 | struct tcindex_data *p = rtnl_dereference(tp->root); |
1da177e4 LT |
474 | struct tcf_walker walker; |
475 | ||
1e052be6 CW |
476 | if (!force) |
477 | return false; | |
478 | ||
aa767bfe | 479 | pr_debug("tcindex_destroy(tp %p),p %p\n", tp, p); |
1da177e4 LT |
480 | walker.count = 0; |
481 | walker.skip = 0; | |
e40f5c72 | 482 | walker.fn = tcindex_destroy_element; |
aa767bfe | 483 | tcindex_walk(tp, &walker); |
331b7292 JF |
484 | |
485 | RCU_INIT_POINTER(tp->root, NULL); | |
486 | call_rcu(&p->rcu, __tcindex_destroy); | |
1e052be6 | 487 | return true; |
1da177e4 LT |
488 | } |
489 | ||
490 | ||
832d1d5b | 491 | static int tcindex_dump(struct net *net, struct tcf_proto *tp, unsigned long fh, |
1da177e4 LT |
492 | struct sk_buff *skb, struct tcmsg *t) |
493 | { | |
331b7292 | 494 | struct tcindex_data *p = rtnl_dereference(tp->root); |
1da177e4 | 495 | struct tcindex_filter_result *r = (struct tcindex_filter_result *) fh; |
4b3550ef | 496 | struct nlattr *nest; |
1da177e4 | 497 | |
6ea3b446 JP |
498 | pr_debug("tcindex_dump(tp %p,fh 0x%lx,skb %p,t %p),p %p,r %p\n", |
499 | tp, fh, skb, t, p, r); | |
aa767bfe | 500 | pr_debug("p->perfect %p p->h %p\n", p->perfect, p->h); |
4b3550ef PM |
501 | |
502 | nest = nla_nest_start(skb, TCA_OPTIONS); | |
503 | if (nest == NULL) | |
504 | goto nla_put_failure; | |
505 | ||
1da177e4 LT |
506 | if (!fh) { |
507 | t->tcm_handle = ~0; /* whatever ... */ | |
1b34ec43 DM |
508 | if (nla_put_u32(skb, TCA_TCINDEX_HASH, p->hash) || |
509 | nla_put_u16(skb, TCA_TCINDEX_MASK, p->mask) || | |
510 | nla_put_u32(skb, TCA_TCINDEX_SHIFT, p->shift) || | |
511 | nla_put_u32(skb, TCA_TCINDEX_FALL_THROUGH, p->fall_through)) | |
512 | goto nla_put_failure; | |
4b3550ef | 513 | nla_nest_end(skb, nest); |
1da177e4 LT |
514 | } else { |
515 | if (p->perfect) { | |
331b7292 | 516 | t->tcm_handle = r - p->perfect; |
1da177e4 LT |
517 | } else { |
518 | struct tcindex_filter *f; | |
331b7292 | 519 | struct tcindex_filter __rcu **fp; |
1da177e4 LT |
520 | int i; |
521 | ||
522 | t->tcm_handle = 0; | |
523 | for (i = 0; !t->tcm_handle && i < p->hash; i++) { | |
331b7292 JF |
524 | fp = &p->h[i]; |
525 | for (f = rtnl_dereference(*fp); | |
526 | !t->tcm_handle && f; | |
527 | fp = &f->next, f = rtnl_dereference(*fp)) { | |
1da177e4 LT |
528 | if (&f->result == r) |
529 | t->tcm_handle = f->key; | |
530 | } | |
531 | } | |
532 | } | |
aa767bfe | 533 | pr_debug("handle = %d\n", t->tcm_handle); |
1b34ec43 DM |
534 | if (r->res.class && |
535 | nla_put_u32(skb, TCA_TCINDEX_CLASSID, r->res.classid)) | |
536 | goto nla_put_failure; | |
1da177e4 | 537 | |
5da57f42 | 538 | if (tcf_exts_dump(skb, &r->exts) < 0) |
add93b61 | 539 | goto nla_put_failure; |
4b3550ef | 540 | nla_nest_end(skb, nest); |
1da177e4 | 541 | |
5da57f42 | 542 | if (tcf_exts_dump_stats(skb, &r->exts) < 0) |
add93b61 | 543 | goto nla_put_failure; |
1da177e4 | 544 | } |
10297b99 | 545 | |
1da177e4 LT |
546 | return skb->len; |
547 | ||
add93b61 | 548 | nla_put_failure: |
6ea3b446 | 549 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
550 | return -1; |
551 | } | |
552 | ||
2eb9d75c | 553 | static struct tcf_proto_ops cls_tcindex_ops __read_mostly = { |
1da177e4 LT |
554 | .kind = "tcindex", |
555 | .classify = tcindex_classify, | |
556 | .init = tcindex_init, | |
557 | .destroy = tcindex_destroy, | |
558 | .get = tcindex_get, | |
1da177e4 LT |
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"); |