Commit | Line | Data |
---|---|---|
09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * net/sched/cls_tcindex.c Packet classifier for skb->tc_index | |
4 | * | |
5 | * Written 1998,1999 by Werner Almesberger, EPFL ICA | |
6 | */ | |
7 | ||
1da177e4 LT |
8 | #include <linux/module.h> |
9 | #include <linux/types.h> | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/skbuff.h> | |
12 | #include <linux/errno.h> | |
5a0e3ad6 | 13 | #include <linux/slab.h> |
1da177e4 | 14 | #include <net/act_api.h> |
dc5fc579 | 15 | #include <net/netlink.h> |
1da177e4 | 16 | #include <net/pkt_cls.h> |
1abf2720 | 17 | #include <net/sch_generic.h> |
1da177e4 | 18 | |
1da177e4 LT |
19 | /* |
20 | * Passing parameters to the root seems to be done more awkwardly than really | |
21 | * necessary. At least, u32 doesn't seem to use such dirty hacks. To be | |
22 | * verified. FIXME. | |
23 | */ | |
24 | ||
25 | #define PERFECT_HASH_THRESHOLD 64 /* use perfect hash if not bigger */ | |
26 | #define DEFAULT_HASH_SIZE 64 /* optimized for diffserv */ | |
27 | ||
28 | ||
1da177e4 LT |
29 | struct tcindex_filter_result { |
30 | struct tcf_exts exts; | |
31 | struct tcf_result res; | |
aaa908ff | 32 | struct rcu_work rwork; |
1da177e4 LT |
33 | }; |
34 | ||
35 | struct tcindex_filter { | |
36 | u16 key; | |
37 | struct tcindex_filter_result result; | |
331b7292 | 38 | struct tcindex_filter __rcu *next; |
aaa908ff | 39 | struct rcu_work rwork; |
1da177e4 LT |
40 | }; |
41 | ||
42 | ||
43 | struct tcindex_data { | |
44 | struct tcindex_filter_result *perfect; /* perfect hash; NULL if none */ | |
331b7292 JF |
45 | struct tcindex_filter __rcu **h; /* imperfect hash; */ |
46 | struct tcf_proto *tp; | |
1da177e4 | 47 | u16 mask; /* AND key with mask */ |
331b7292 JF |
48 | u32 shift; /* shift ANDed key to the right */ |
49 | u32 hash; /* hash table size; 0 if undefined */ | |
50 | u32 alloc_hash; /* allocated size */ | |
51 | u32 fall_through; /* 0: only classify if explicit match */ | |
3d210534 | 52 | struct rcu_work rwork; |
1da177e4 LT |
53 | }; |
54 | ||
5a7a5555 | 55 | static inline int tcindex_filter_is_set(struct tcindex_filter_result *r) |
1da177e4 | 56 | { |
6fc6d06e | 57 | return tcf_exts_has_actions(&r->exts) || r->res.classid; |
1da177e4 LT |
58 | } |
59 | ||
5a7a5555 JHS |
60 | static struct tcindex_filter_result *tcindex_lookup(struct tcindex_data *p, |
61 | u16 key) | |
1da177e4 | 62 | { |
331b7292 JF |
63 | if (p->perfect) { |
64 | struct tcindex_filter_result *f = p->perfect + key; | |
65 | ||
66 | return tcindex_filter_is_set(f) ? f : NULL; | |
67 | } else if (p->h) { | |
68 | struct tcindex_filter __rcu **fp; | |
69 | struct tcindex_filter *f; | |
1da177e4 | 70 | |
331b7292 JF |
71 | fp = &p->h[key % p->hash]; |
72 | for (f = rcu_dereference_bh_rtnl(*fp); | |
73 | f; | |
74 | fp = &f->next, f = rcu_dereference_bh_rtnl(*fp)) | |
1da177e4 LT |
75 | if (f->key == key) |
76 | return &f->result; | |
77 | } | |
78 | ||
79 | return NULL; | |
80 | } | |
81 | ||
82 | ||
dc7f9f6e | 83 | static int tcindex_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
1da177e4 LT |
84 | struct tcf_result *res) |
85 | { | |
2f9a220e | 86 | struct tcindex_data *p = rcu_dereference_bh(tp->root); |
1da177e4 LT |
87 | struct tcindex_filter_result *f; |
88 | int key = (skb->tc_index & p->mask) >> p->shift; | |
89 | ||
aa767bfe SH |
90 | pr_debug("tcindex_classify(skb %p,tp %p,res %p),p %p\n", |
91 | skb, tp, res, p); | |
1da177e4 LT |
92 | |
93 | f = tcindex_lookup(p, key); | |
94 | if (!f) { | |
1abf2720 JP |
95 | struct Qdisc *q = tcf_block_q(tp->chain->block); |
96 | ||
1da177e4 LT |
97 | if (!p->fall_through) |
98 | return -1; | |
1abf2720 | 99 | res->classid = TC_H_MAKE(TC_H_MAJ(q->handle), key); |
1da177e4 | 100 | res->class = 0; |
aa767bfe | 101 | pr_debug("alg 0x%x\n", res->classid); |
1da177e4 LT |
102 | return 0; |
103 | } | |
104 | *res = f->res; | |
aa767bfe | 105 | pr_debug("map 0x%x\n", res->classid); |
1da177e4 LT |
106 | |
107 | return tcf_exts_exec(skb, &f->exts, res); | |
108 | } | |
109 | ||
110 | ||
8113c095 | 111 | static void *tcindex_get(struct tcf_proto *tp, u32 handle) |
1da177e4 | 112 | { |
331b7292 | 113 | struct tcindex_data *p = rtnl_dereference(tp->root); |
1da177e4 LT |
114 | struct tcindex_filter_result *r; |
115 | ||
aa767bfe | 116 | pr_debug("tcindex_get(tp %p,handle 0x%08x)\n", tp, handle); |
1da177e4 | 117 | if (p->perfect && handle >= p->alloc_hash) |
8113c095 | 118 | return NULL; |
1da177e4 | 119 | r = tcindex_lookup(p, handle); |
8113c095 | 120 | return r && tcindex_filter_is_set(r) ? r : NULL; |
1da177e4 LT |
121 | } |
122 | ||
1da177e4 LT |
123 | static int tcindex_init(struct tcf_proto *tp) |
124 | { | |
125 | struct tcindex_data *p; | |
126 | ||
aa767bfe SH |
127 | pr_debug("tcindex_init(tp %p)\n", tp); |
128 | p = kzalloc(sizeof(struct tcindex_data), GFP_KERNEL); | |
1da177e4 LT |
129 | if (!p) |
130 | return -ENOMEM; | |
131 | ||
1da177e4 LT |
132 | p->mask = 0xffff; |
133 | p->hash = DEFAULT_HASH_SIZE; | |
134 | p->fall_through = 1; | |
135 | ||
331b7292 | 136 | rcu_assign_pointer(tp->root, p); |
1da177e4 LT |
137 | return 0; |
138 | } | |
139 | ||
f2b75105 CW |
140 | static void __tcindex_destroy_rexts(struct tcindex_filter_result *r) |
141 | { | |
142 | tcf_exts_destroy(&r->exts); | |
143 | tcf_exts_put_net(&r->exts); | |
144 | } | |
145 | ||
27ce4f05 CW |
146 | static void tcindex_destroy_rexts_work(struct work_struct *work) |
147 | { | |
148 | struct tcindex_filter_result *r; | |
149 | ||
aaa908ff CW |
150 | r = container_of(to_rcu_work(work), |
151 | struct tcindex_filter_result, | |
152 | rwork); | |
27ce4f05 | 153 | rtnl_lock(); |
f2b75105 | 154 | __tcindex_destroy_rexts(r); |
27ce4f05 CW |
155 | rtnl_unlock(); |
156 | } | |
157 | ||
f2b75105 CW |
158 | static void __tcindex_destroy_fexts(struct tcindex_filter *f) |
159 | { | |
160 | tcf_exts_destroy(&f->result.exts); | |
161 | tcf_exts_put_net(&f->result.exts); | |
162 | kfree(f); | |
163 | } | |
164 | ||
27ce4f05 CW |
165 | static void tcindex_destroy_fexts_work(struct work_struct *work) |
166 | { | |
aaa908ff CW |
167 | struct tcindex_filter *f = container_of(to_rcu_work(work), |
168 | struct tcindex_filter, | |
169 | rwork); | |
27ce4f05 CW |
170 | |
171 | rtnl_lock(); | |
f2b75105 | 172 | __tcindex_destroy_fexts(f); |
27ce4f05 | 173 | rtnl_unlock(); |
ed7aa879 AS |
174 | } |
175 | ||
571acf21 | 176 | static int tcindex_delete(struct tcf_proto *tp, void *arg, bool *last, |
12db03b6 | 177 | bool rtnl_held, struct netlink_ext_ack *extack) |
1da177e4 | 178 | { |
331b7292 | 179 | struct tcindex_data *p = rtnl_dereference(tp->root); |
8113c095 | 180 | struct tcindex_filter_result *r = arg; |
331b7292 | 181 | struct tcindex_filter __rcu **walk; |
1da177e4 LT |
182 | struct tcindex_filter *f = NULL; |
183 | ||
8113c095 | 184 | pr_debug("tcindex_delete(tp %p,arg %p),p %p\n", tp, arg, p); |
1da177e4 LT |
185 | if (p->perfect) { |
186 | if (!r->res.class) | |
187 | return -ENOENT; | |
188 | } else { | |
189 | int i; | |
1da177e4 | 190 | |
331b7292 JF |
191 | for (i = 0; i < p->hash; i++) { |
192 | walk = p->h + i; | |
193 | for (f = rtnl_dereference(*walk); f; | |
194 | walk = &f->next, f = rtnl_dereference(*walk)) { | |
195 | if (&f->result == r) | |
1da177e4 | 196 | goto found; |
331b7292 JF |
197 | } |
198 | } | |
1da177e4 LT |
199 | return -ENOENT; |
200 | ||
201 | found: | |
331b7292 | 202 | rcu_assign_pointer(*walk, rtnl_dereference(f->next)); |
1da177e4 LT |
203 | } |
204 | tcf_unbind_filter(tp, &r->res); | |
ed7aa879 AS |
205 | /* all classifiers are required to call tcf_exts_destroy() after rcu |
206 | * grace period, since converted-to-rcu actions are relying on that | |
207 | * in cleanup() callback | |
208 | */ | |
f2b75105 CW |
209 | if (f) { |
210 | if (tcf_exts_get_net(&f->result.exts)) | |
aaa908ff | 211 | tcf_queue_work(&f->rwork, tcindex_destroy_fexts_work); |
f2b75105 CW |
212 | else |
213 | __tcindex_destroy_fexts(f); | |
214 | } else { | |
215 | if (tcf_exts_get_net(&r->exts)) | |
aaa908ff | 216 | tcf_queue_work(&r->rwork, tcindex_destroy_rexts_work); |
f2b75105 CW |
217 | else |
218 | __tcindex_destroy_rexts(r); | |
219 | } | |
763dbf63 WC |
220 | |
221 | *last = false; | |
1da177e4 LT |
222 | return 0; |
223 | } | |
224 | ||
3d210534 | 225 | static void tcindex_destroy_work(struct work_struct *work) |
331b7292 | 226 | { |
3d210534 CW |
227 | struct tcindex_data *p = container_of(to_rcu_work(work), |
228 | struct tcindex_data, | |
229 | rwork); | |
331b7292 JF |
230 | |
231 | kfree(p->perfect); | |
232 | kfree(p->h); | |
233 | kfree(p); | |
1da177e4 LT |
234 | } |
235 | ||
236 | static inline int | |
237 | valid_perfect_hash(struct tcindex_data *p) | |
238 | { | |
239 | return p->hash > (p->mask >> p->shift); | |
240 | } | |
241 | ||
6fa8c014 PM |
242 | static const struct nla_policy tcindex_policy[TCA_TCINDEX_MAX + 1] = { |
243 | [TCA_TCINDEX_HASH] = { .type = NLA_U32 }, | |
244 | [TCA_TCINDEX_MASK] = { .type = NLA_U16 }, | |
245 | [TCA_TCINDEX_SHIFT] = { .type = NLA_U32 }, | |
246 | [TCA_TCINDEX_FALL_THROUGH] = { .type = NLA_U32 }, | |
247 | [TCA_TCINDEX_CLASSID] = { .type = NLA_U32 }, | |
248 | }; | |
249 | ||
14215108 CW |
250 | static int tcindex_filter_result_init(struct tcindex_filter_result *r, |
251 | struct net *net) | |
bf63ac73 CW |
252 | { |
253 | memset(r, 0, sizeof(*r)); | |
14215108 CW |
254 | return tcf_exts_init(&r->exts, net, TCA_TCINDEX_ACT, |
255 | TCA_TCINDEX_POLICE); | |
bf63ac73 CW |
256 | } |
257 | ||
3d210534 | 258 | static void tcindex_partial_destroy_work(struct work_struct *work) |
331b7292 | 259 | { |
3d210534 CW |
260 | struct tcindex_data *p = container_of(to_rcu_work(work), |
261 | struct tcindex_data, | |
262 | rwork); | |
331b7292 JF |
263 | |
264 | kfree(p->perfect); | |
265 | kfree(p); | |
266 | } | |
267 | ||
b9a24bb7 WC |
268 | static void tcindex_free_perfect_hash(struct tcindex_data *cp) |
269 | { | |
270 | int i; | |
271 | ||
272 | for (i = 0; i < cp->hash; i++) | |
273 | tcf_exts_destroy(&cp->perfect[i].exts); | |
274 | kfree(cp->perfect); | |
275 | } | |
276 | ||
033b228e | 277 | static int tcindex_alloc_perfect_hash(struct net *net, struct tcindex_data *cp) |
b9a24bb7 WC |
278 | { |
279 | int i, err = 0; | |
280 | ||
281 | cp->perfect = kcalloc(cp->hash, sizeof(struct tcindex_filter_result), | |
282 | GFP_KERNEL); | |
283 | if (!cp->perfect) | |
284 | return -ENOMEM; | |
285 | ||
286 | for (i = 0; i < cp->hash; i++) { | |
14215108 | 287 | err = tcf_exts_init(&cp->perfect[i].exts, net, |
b9a24bb7 WC |
288 | TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE); |
289 | if (err < 0) | |
290 | goto errout; | |
291 | } | |
292 | ||
293 | return 0; | |
294 | ||
295 | errout: | |
296 | tcindex_free_perfect_hash(cp); | |
297 | return err; | |
298 | } | |
299 | ||
1da177e4 | 300 | static int |
c1b52739 BL |
301 | tcindex_set_parms(struct net *net, struct tcf_proto *tp, unsigned long base, |
302 | u32 handle, struct tcindex_data *p, | |
303 | struct tcindex_filter_result *r, struct nlattr **tb, | |
50a56190 | 304 | struct nlattr *est, bool ovr, struct netlink_ext_ack *extack) |
1da177e4 | 305 | { |
1da177e4 | 306 | struct tcindex_filter_result new_filter_result, *old_r = r; |
b9a24bb7 | 307 | struct tcindex_data *cp = NULL, *oldp; |
1da177e4 | 308 | struct tcindex_filter *f = NULL; /* make gcc behave */ |
1db817e7 | 309 | struct tcf_result cr = {}; |
b9a24bb7 | 310 | int err, balloc = 0; |
1da177e4 LT |
311 | struct tcf_exts e; |
312 | ||
14215108 | 313 | err = tcf_exts_init(&e, net, TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE); |
1da177e4 LT |
314 | if (err < 0) |
315 | return err; | |
ec6743a1 | 316 | err = tcf_exts_validate(net, tp, tb, est, &e, ovr, true, extack); |
b9a24bb7 WC |
317 | if (err < 0) |
318 | goto errout; | |
10297b99 | 319 | |
02c5e844 | 320 | err = -ENOMEM; |
331b7292 JF |
321 | /* tcindex_data attributes must look atomic to classifier/lookup so |
322 | * allocate new tcindex data and RCU assign it onto root. Keeping | |
323 | * perfect hash and hash pointers from old data. | |
324 | */ | |
a57a65ba | 325 | cp = kzalloc(sizeof(*cp), GFP_KERNEL); |
02c5e844 | 326 | if (!cp) |
44b75e43 | 327 | goto errout; |
331b7292 JF |
328 | |
329 | cp->mask = p->mask; | |
330 | cp->shift = p->shift; | |
331 | cp->hash = p->hash; | |
332 | cp->alloc_hash = p->alloc_hash; | |
333 | cp->fall_through = p->fall_through; | |
334 | cp->tp = tp; | |
335 | ||
336 | if (p->perfect) { | |
6e056569 WC |
337 | int i; |
338 | ||
033b228e | 339 | if (tcindex_alloc_perfect_hash(net, cp) < 0) |
331b7292 | 340 | goto errout; |
6e056569 | 341 | for (i = 0; i < cp->hash; i++) |
b9a24bb7 | 342 | cp->perfect[i].res = p->perfect[i].res; |
44b75e43 | 343 | balloc = 1; |
331b7292 JF |
344 | } |
345 | cp->h = p->h; | |
346 | ||
14215108 | 347 | err = tcindex_filter_result_init(&new_filter_result, net); |
b9a24bb7 WC |
348 | if (err < 0) |
349 | goto errout1; | |
1da177e4 | 350 | if (old_r) |
1db817e7 | 351 | cr = r->res; |
1da177e4 | 352 | |
6fa8c014 | 353 | if (tb[TCA_TCINDEX_HASH]) |
331b7292 | 354 | cp->hash = nla_get_u32(tb[TCA_TCINDEX_HASH]); |
1da177e4 | 355 | |
6fa8c014 | 356 | if (tb[TCA_TCINDEX_MASK]) |
331b7292 | 357 | cp->mask = nla_get_u16(tb[TCA_TCINDEX_MASK]); |
1da177e4 | 358 | |
6fa8c014 | 359 | if (tb[TCA_TCINDEX_SHIFT]) |
331b7292 | 360 | cp->shift = nla_get_u32(tb[TCA_TCINDEX_SHIFT]); |
1da177e4 LT |
361 | |
362 | err = -EBUSY; | |
331b7292 | 363 | |
1da177e4 LT |
364 | /* Hash already allocated, make sure that we still meet the |
365 | * requirements for the allocated hash. | |
366 | */ | |
331b7292 JF |
367 | if (cp->perfect) { |
368 | if (!valid_perfect_hash(cp) || | |
369 | cp->hash > cp->alloc_hash) | |
44b75e43 | 370 | goto errout_alloc; |
331b7292 | 371 | } else if (cp->h && cp->hash != cp->alloc_hash) { |
44b75e43 | 372 | goto errout_alloc; |
331b7292 | 373 | } |
1da177e4 LT |
374 | |
375 | err = -EINVAL; | |
6fa8c014 | 376 | if (tb[TCA_TCINDEX_FALL_THROUGH]) |
331b7292 | 377 | cp->fall_through = nla_get_u32(tb[TCA_TCINDEX_FALL_THROUGH]); |
1da177e4 | 378 | |
331b7292 | 379 | if (!cp->hash) { |
1da177e4 LT |
380 | /* Hash not specified, use perfect hash if the upper limit |
381 | * of the hashing index is below the threshold. | |
382 | */ | |
331b7292 JF |
383 | if ((cp->mask >> cp->shift) < PERFECT_HASH_THRESHOLD) |
384 | cp->hash = (cp->mask >> cp->shift) + 1; | |
1da177e4 | 385 | else |
331b7292 | 386 | cp->hash = DEFAULT_HASH_SIZE; |
1da177e4 LT |
387 | } |
388 | ||
68f6a7c6 | 389 | if (!cp->perfect && !cp->h) |
331b7292 | 390 | cp->alloc_hash = cp->hash; |
1da177e4 LT |
391 | |
392 | /* Note: this could be as restrictive as if (handle & ~(mask >> shift)) | |
393 | * but then, we'd fail handles that may become valid after some future | |
394 | * mask change. While this is extremely unlikely to ever matter, | |
395 | * the check below is safer (and also more backwards-compatible). | |
396 | */ | |
331b7292 JF |
397 | if (cp->perfect || valid_perfect_hash(cp)) |
398 | if (handle >= cp->alloc_hash) | |
44b75e43 | 399 | goto errout_alloc; |
1da177e4 LT |
400 | |
401 | ||
402 | err = -ENOMEM; | |
331b7292 JF |
403 | if (!cp->perfect && !cp->h) { |
404 | if (valid_perfect_hash(cp)) { | |
033b228e | 405 | if (tcindex_alloc_perfect_hash(net, cp) < 0) |
44b75e43 | 406 | goto errout_alloc; |
1da177e4 LT |
407 | balloc = 1; |
408 | } else { | |
331b7292 JF |
409 | struct tcindex_filter __rcu **hash; |
410 | ||
411 | hash = kcalloc(cp->hash, | |
412 | sizeof(struct tcindex_filter *), | |
413 | GFP_KERNEL); | |
414 | ||
415 | if (!hash) | |
44b75e43 | 416 | goto errout_alloc; |
331b7292 JF |
417 | |
418 | cp->h = hash; | |
1da177e4 LT |
419 | balloc = 2; |
420 | } | |
421 | } | |
422 | ||
331b7292 JF |
423 | if (cp->perfect) |
424 | r = cp->perfect + handle; | |
1da177e4 | 425 | else |
331b7292 | 426 | r = tcindex_lookup(cp, handle) ? : &new_filter_result; |
1da177e4 LT |
427 | |
428 | if (r == &new_filter_result) { | |
0da974f4 | 429 | f = kzalloc(sizeof(*f), GFP_KERNEL); |
1da177e4 LT |
430 | if (!f) |
431 | goto errout_alloc; | |
6e056569 | 432 | f->key = handle; |
6e056569 | 433 | f->next = NULL; |
14215108 | 434 | err = tcindex_filter_result_init(&f->result, net); |
b9a24bb7 WC |
435 | if (err < 0) { |
436 | kfree(f); | |
437 | goto errout_alloc; | |
438 | } | |
10297b99 | 439 | } |
1da177e4 | 440 | |
add93b61 | 441 | if (tb[TCA_TCINDEX_CLASSID]) { |
1db817e7 CW |
442 | cr.classid = nla_get_u32(tb[TCA_TCINDEX_CLASSID]); |
443 | tcf_bind_filter(tp, &cr, base); | |
10297b99 | 444 | } |
1da177e4 | 445 | |
b9a24bb7 | 446 | if (old_r && old_r != r) { |
14215108 | 447 | err = tcindex_filter_result_init(old_r, net); |
b9a24bb7 WC |
448 | if (err < 0) { |
449 | kfree(f); | |
450 | goto errout_alloc; | |
451 | } | |
452 | } | |
1da177e4 | 453 | |
331b7292 | 454 | oldp = p; |
1db817e7 | 455 | r->res = cr; |
2df8bee5 HL |
456 | tcf_exts_change(&r->exts, &e); |
457 | ||
331b7292 | 458 | rcu_assign_pointer(tp->root, cp); |
1da177e4 LT |
459 | |
460 | if (r == &new_filter_result) { | |
331b7292 JF |
461 | struct tcindex_filter *nfp; |
462 | struct tcindex_filter __rcu **fp; | |
1da177e4 | 463 | |
008369dc | 464 | f->result.res = r->res; |
9b0d4446 | 465 | tcf_exts_change(&f->result.exts, &r->exts); |
331b7292 | 466 | |
69301eaa | 467 | fp = cp->h + (handle % cp->hash); |
331b7292 JF |
468 | for (nfp = rtnl_dereference(*fp); |
469 | nfp; | |
470 | fp = &nfp->next, nfp = rtnl_dereference(*fp)) | |
471 | ; /* nothing */ | |
472 | ||
473 | rcu_assign_pointer(*fp, f); | |
1db817e7 CW |
474 | } else { |
475 | tcf_exts_destroy(&new_filter_result.exts); | |
10297b99 | 476 | } |
1da177e4 | 477 | |
331b7292 | 478 | if (oldp) |
3d210534 | 479 | tcf_queue_work(&oldp->rwork, tcindex_partial_destroy_work); |
1da177e4 LT |
480 | return 0; |
481 | ||
482 | errout_alloc: | |
483 | if (balloc == 1) | |
b9a24bb7 | 484 | tcindex_free_perfect_hash(cp); |
1da177e4 | 485 | else if (balloc == 2) |
331b7292 | 486 | kfree(cp->h); |
b9a24bb7 | 487 | errout1: |
b9a24bb7 | 488 | tcf_exts_destroy(&new_filter_result.exts); |
1da177e4 | 489 | errout: |
331b7292 | 490 | kfree(cp); |
18d0264f | 491 | tcf_exts_destroy(&e); |
1da177e4 LT |
492 | return err; |
493 | } | |
494 | ||
495 | static int | |
c1b52739 | 496 | tcindex_change(struct net *net, struct sk_buff *in_skb, |
af4c6641 | 497 | struct tcf_proto *tp, unsigned long base, u32 handle, |
7306db38 | 498 | struct nlattr **tca, void **arg, bool ovr, |
12db03b6 | 499 | bool rtnl_held, struct netlink_ext_ack *extack) |
1da177e4 | 500 | { |
add93b61 PM |
501 | struct nlattr *opt = tca[TCA_OPTIONS]; |
502 | struct nlattr *tb[TCA_TCINDEX_MAX + 1]; | |
331b7292 | 503 | struct tcindex_data *p = rtnl_dereference(tp->root); |
8113c095 | 504 | struct tcindex_filter_result *r = *arg; |
cee63723 | 505 | int err; |
1da177e4 | 506 | |
aa767bfe | 507 | pr_debug("tcindex_change(tp %p,handle 0x%08x,tca %p,arg %p),opt %p," |
8113c095 WC |
508 | "p %p,r %p,*arg %p\n", |
509 | tp, handle, tca, arg, opt, p, r, arg ? *arg : NULL); | |
1da177e4 LT |
510 | |
511 | if (!opt) | |
512 | return 0; | |
513 | ||
8cb08174 JB |
514 | err = nla_parse_nested_deprecated(tb, TCA_TCINDEX_MAX, opt, |
515 | tcindex_policy, NULL); | |
cee63723 PM |
516 | if (err < 0) |
517 | return err; | |
1da177e4 | 518 | |
c1b52739 | 519 | return tcindex_set_parms(net, tp, base, handle, p, r, tb, |
50a56190 | 520 | tca[TCA_RATE], ovr, extack); |
1da177e4 LT |
521 | } |
522 | ||
12db03b6 VB |
523 | static void tcindex_walk(struct tcf_proto *tp, struct tcf_walker *walker, |
524 | bool rtnl_held) | |
1da177e4 | 525 | { |
331b7292 | 526 | struct tcindex_data *p = rtnl_dereference(tp->root); |
aa767bfe | 527 | struct tcindex_filter *f, *next; |
1da177e4 LT |
528 | int i; |
529 | ||
aa767bfe | 530 | pr_debug("tcindex_walk(tp %p,walker %p),p %p\n", tp, walker, p); |
1da177e4 LT |
531 | if (p->perfect) { |
532 | for (i = 0; i < p->hash; i++) { | |
533 | if (!p->perfect[i].res.class) | |
534 | continue; | |
535 | if (walker->count >= walker->skip) { | |
8113c095 | 536 | if (walker->fn(tp, p->perfect + i, walker) < 0) { |
1da177e4 LT |
537 | walker->stop = 1; |
538 | return; | |
539 | } | |
540 | } | |
541 | walker->count++; | |
542 | } | |
543 | } | |
544 | if (!p->h) | |
545 | return; | |
546 | for (i = 0; i < p->hash; i++) { | |
331b7292 JF |
547 | for (f = rtnl_dereference(p->h[i]); f; f = next) { |
548 | next = rtnl_dereference(f->next); | |
1da177e4 | 549 | if (walker->count >= walker->skip) { |
8113c095 | 550 | if (walker->fn(tp, &f->result, walker) < 0) { |
1da177e4 LT |
551 | walker->stop = 1; |
552 | return; | |
553 | } | |
554 | } | |
555 | walker->count++; | |
556 | } | |
557 | } | |
558 | } | |
559 | ||
12db03b6 | 560 | static void tcindex_destroy(struct tcf_proto *tp, bool rtnl_held, |
715df5ec | 561 | struct netlink_ext_ack *extack) |
1da177e4 | 562 | { |
331b7292 | 563 | struct tcindex_data *p = rtnl_dereference(tp->root); |
51dcb69d | 564 | int i; |
1da177e4 | 565 | |
aa767bfe | 566 | pr_debug("tcindex_destroy(tp %p),p %p\n", tp, p); |
51dcb69d CW |
567 | |
568 | if (p->perfect) { | |
569 | for (i = 0; i < p->hash; i++) { | |
570 | struct tcindex_filter_result *r = p->perfect + i; | |
571 | ||
572 | tcf_unbind_filter(tp, &r->res); | |
573 | if (tcf_exts_get_net(&r->exts)) | |
574 | tcf_queue_work(&r->rwork, | |
575 | tcindex_destroy_rexts_work); | |
576 | else | |
577 | __tcindex_destroy_rexts(r); | |
578 | } | |
579 | } | |
580 | ||
581 | for (i = 0; p->h && i < p->hash; i++) { | |
582 | struct tcindex_filter *f, *next; | |
583 | bool last; | |
584 | ||
585 | for (f = rtnl_dereference(p->h[i]); f; f = next) { | |
586 | next = rtnl_dereference(f->next); | |
587 | tcindex_delete(tp, &f->result, &last, rtnl_held, NULL); | |
588 | } | |
589 | } | |
331b7292 | 590 | |
3d210534 | 591 | tcf_queue_work(&p->rwork, tcindex_destroy_work); |
1da177e4 LT |
592 | } |
593 | ||
594 | ||
8113c095 | 595 | static int tcindex_dump(struct net *net, struct tcf_proto *tp, void *fh, |
12db03b6 | 596 | struct sk_buff *skb, struct tcmsg *t, bool rtnl_held) |
1da177e4 | 597 | { |
331b7292 | 598 | struct tcindex_data *p = rtnl_dereference(tp->root); |
8113c095 | 599 | struct tcindex_filter_result *r = fh; |
4b3550ef | 600 | struct nlattr *nest; |
1da177e4 | 601 | |
8113c095 | 602 | pr_debug("tcindex_dump(tp %p,fh %p,skb %p,t %p),p %p,r %p\n", |
6ea3b446 | 603 | tp, fh, skb, t, p, r); |
aa767bfe | 604 | pr_debug("p->perfect %p p->h %p\n", p->perfect, p->h); |
4b3550ef | 605 | |
ae0be8de | 606 | nest = nla_nest_start_noflag(skb, TCA_OPTIONS); |
4b3550ef PM |
607 | if (nest == NULL) |
608 | goto nla_put_failure; | |
609 | ||
1da177e4 LT |
610 | if (!fh) { |
611 | t->tcm_handle = ~0; /* whatever ... */ | |
1b34ec43 DM |
612 | if (nla_put_u32(skb, TCA_TCINDEX_HASH, p->hash) || |
613 | nla_put_u16(skb, TCA_TCINDEX_MASK, p->mask) || | |
614 | nla_put_u32(skb, TCA_TCINDEX_SHIFT, p->shift) || | |
615 | nla_put_u32(skb, TCA_TCINDEX_FALL_THROUGH, p->fall_through)) | |
616 | goto nla_put_failure; | |
4b3550ef | 617 | nla_nest_end(skb, nest); |
1da177e4 LT |
618 | } else { |
619 | if (p->perfect) { | |
331b7292 | 620 | t->tcm_handle = r - p->perfect; |
1da177e4 LT |
621 | } else { |
622 | struct tcindex_filter *f; | |
331b7292 | 623 | struct tcindex_filter __rcu **fp; |
1da177e4 LT |
624 | int i; |
625 | ||
626 | t->tcm_handle = 0; | |
627 | for (i = 0; !t->tcm_handle && i < p->hash; i++) { | |
331b7292 JF |
628 | fp = &p->h[i]; |
629 | for (f = rtnl_dereference(*fp); | |
630 | !t->tcm_handle && f; | |
631 | fp = &f->next, f = rtnl_dereference(*fp)) { | |
1da177e4 LT |
632 | if (&f->result == r) |
633 | t->tcm_handle = f->key; | |
634 | } | |
635 | } | |
636 | } | |
aa767bfe | 637 | pr_debug("handle = %d\n", t->tcm_handle); |
1b34ec43 DM |
638 | if (r->res.class && |
639 | nla_put_u32(skb, TCA_TCINDEX_CLASSID, r->res.classid)) | |
640 | goto nla_put_failure; | |
1da177e4 | 641 | |
5da57f42 | 642 | if (tcf_exts_dump(skb, &r->exts) < 0) |
add93b61 | 643 | goto nla_put_failure; |
4b3550ef | 644 | nla_nest_end(skb, nest); |
1da177e4 | 645 | |
5da57f42 | 646 | if (tcf_exts_dump_stats(skb, &r->exts) < 0) |
add93b61 | 647 | goto nla_put_failure; |
1da177e4 | 648 | } |
10297b99 | 649 | |
1da177e4 LT |
650 | return skb->len; |
651 | ||
add93b61 | 652 | nla_put_failure: |
6ea3b446 | 653 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
654 | return -1; |
655 | } | |
656 | ||
07d79fc7 CW |
657 | static void tcindex_bind_class(void *fh, u32 classid, unsigned long cl) |
658 | { | |
659 | struct tcindex_filter_result *r = fh; | |
660 | ||
661 | if (r && r->res.classid == classid) | |
662 | r->res.class = cl; | |
663 | } | |
664 | ||
2eb9d75c | 665 | static struct tcf_proto_ops cls_tcindex_ops __read_mostly = { |
1da177e4 LT |
666 | .kind = "tcindex", |
667 | .classify = tcindex_classify, | |
668 | .init = tcindex_init, | |
669 | .destroy = tcindex_destroy, | |
670 | .get = tcindex_get, | |
1da177e4 LT |
671 | .change = tcindex_change, |
672 | .delete = tcindex_delete, | |
673 | .walk = tcindex_walk, | |
674 | .dump = tcindex_dump, | |
07d79fc7 | 675 | .bind_class = tcindex_bind_class, |
1da177e4 LT |
676 | .owner = THIS_MODULE, |
677 | }; | |
678 | ||
679 | static int __init init_tcindex(void) | |
680 | { | |
681 | return register_tcf_proto_ops(&cls_tcindex_ops); | |
682 | } | |
683 | ||
10297b99 | 684 | static void __exit exit_tcindex(void) |
1da177e4 LT |
685 | { |
686 | unregister_tcf_proto_ops(&cls_tcindex_ops); | |
687 | } | |
688 | ||
689 | module_init(init_tcindex) | |
690 | module_exit(exit_tcindex) | |
691 | MODULE_LICENSE("GPL"); |