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77b9900e JP |
1 | /* |
2 | * net/sched/cls_flower.c Flower classifier | |
3 | * | |
4 | * Copyright (c) 2015 Jiri Pirko <jiri@resnulli.us> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/rhashtable.h> | |
16 | ||
17 | #include <linux/if_ether.h> | |
18 | #include <linux/in6.h> | |
19 | #include <linux/ip.h> | |
20 | ||
21 | #include <net/sch_generic.h> | |
22 | #include <net/pkt_cls.h> | |
23 | #include <net/ip.h> | |
24 | #include <net/flow_dissector.h> | |
25 | ||
26 | struct fl_flow_key { | |
27 | int indev_ifindex; | |
28 | struct flow_dissector_key_basic basic; | |
29 | struct flow_dissector_key_eth_addrs eth; | |
30 | union { | |
31 | struct flow_dissector_key_addrs ipv4; | |
32 | struct flow_dissector_key_ipv6_addrs ipv6; | |
33 | }; | |
34 | struct flow_dissector_key_ports tp; | |
35 | } __aligned(BITS_PER_LONG / 8); /* Ensure that we can do comparisons as longs. */ | |
36 | ||
37 | struct fl_flow_mask_range { | |
38 | unsigned short int start; | |
39 | unsigned short int end; | |
40 | }; | |
41 | ||
42 | struct fl_flow_mask { | |
43 | struct fl_flow_key key; | |
44 | struct fl_flow_mask_range range; | |
45 | struct rcu_head rcu; | |
46 | }; | |
47 | ||
48 | struct cls_fl_head { | |
49 | struct rhashtable ht; | |
50 | struct fl_flow_mask mask; | |
51 | struct flow_dissector dissector; | |
52 | u32 hgen; | |
53 | bool mask_assigned; | |
54 | struct list_head filters; | |
55 | struct rhashtable_params ht_params; | |
56 | struct rcu_head rcu; | |
57 | }; | |
58 | ||
59 | struct cls_fl_filter { | |
60 | struct rhash_head ht_node; | |
61 | struct fl_flow_key mkey; | |
62 | struct tcf_exts exts; | |
63 | struct tcf_result res; | |
64 | struct fl_flow_key key; | |
65 | struct list_head list; | |
66 | u32 handle; | |
67 | struct rcu_head rcu; | |
68 | }; | |
69 | ||
70 | static unsigned short int fl_mask_range(const struct fl_flow_mask *mask) | |
71 | { | |
72 | return mask->range.end - mask->range.start; | |
73 | } | |
74 | ||
75 | static void fl_mask_update_range(struct fl_flow_mask *mask) | |
76 | { | |
77 | const u8 *bytes = (const u8 *) &mask->key; | |
78 | size_t size = sizeof(mask->key); | |
79 | size_t i, first = 0, last = size - 1; | |
80 | ||
81 | for (i = 0; i < sizeof(mask->key); i++) { | |
82 | if (bytes[i]) { | |
83 | if (!first && i) | |
84 | first = i; | |
85 | last = i; | |
86 | } | |
87 | } | |
88 | mask->range.start = rounddown(first, sizeof(long)); | |
89 | mask->range.end = roundup(last + 1, sizeof(long)); | |
90 | } | |
91 | ||
92 | static void *fl_key_get_start(struct fl_flow_key *key, | |
93 | const struct fl_flow_mask *mask) | |
94 | { | |
95 | return (u8 *) key + mask->range.start; | |
96 | } | |
97 | ||
98 | static void fl_set_masked_key(struct fl_flow_key *mkey, struct fl_flow_key *key, | |
99 | struct fl_flow_mask *mask) | |
100 | { | |
101 | const long *lkey = fl_key_get_start(key, mask); | |
102 | const long *lmask = fl_key_get_start(&mask->key, mask); | |
103 | long *lmkey = fl_key_get_start(mkey, mask); | |
104 | int i; | |
105 | ||
106 | for (i = 0; i < fl_mask_range(mask); i += sizeof(long)) | |
107 | *lmkey++ = *lkey++ & *lmask++; | |
108 | } | |
109 | ||
110 | static void fl_clear_masked_range(struct fl_flow_key *key, | |
111 | struct fl_flow_mask *mask) | |
112 | { | |
113 | memset(fl_key_get_start(key, mask), 0, fl_mask_range(mask)); | |
114 | } | |
115 | ||
116 | static int fl_classify(struct sk_buff *skb, const struct tcf_proto *tp, | |
117 | struct tcf_result *res) | |
118 | { | |
119 | struct cls_fl_head *head = rcu_dereference_bh(tp->root); | |
120 | struct cls_fl_filter *f; | |
121 | struct fl_flow_key skb_key; | |
122 | struct fl_flow_key skb_mkey; | |
123 | ||
124 | fl_clear_masked_range(&skb_key, &head->mask); | |
125 | skb_key.indev_ifindex = skb->skb_iif; | |
126 | /* skb_flow_dissect() does not set n_proto in case an unknown protocol, | |
127 | * so do it rather here. | |
128 | */ | |
129 | skb_key.basic.n_proto = skb->protocol; | |
130 | skb_flow_dissect(skb, &head->dissector, &skb_key); | |
131 | ||
132 | fl_set_masked_key(&skb_mkey, &skb_key, &head->mask); | |
133 | ||
134 | f = rhashtable_lookup_fast(&head->ht, | |
135 | fl_key_get_start(&skb_mkey, &head->mask), | |
136 | head->ht_params); | |
137 | if (f) { | |
138 | *res = f->res; | |
139 | return tcf_exts_exec(skb, &f->exts, res); | |
140 | } | |
141 | return -1; | |
142 | } | |
143 | ||
144 | static int fl_init(struct tcf_proto *tp) | |
145 | { | |
146 | struct cls_fl_head *head; | |
147 | ||
148 | head = kzalloc(sizeof(*head), GFP_KERNEL); | |
149 | if (!head) | |
150 | return -ENOBUFS; | |
151 | ||
152 | INIT_LIST_HEAD_RCU(&head->filters); | |
153 | rcu_assign_pointer(tp->root, head); | |
154 | ||
155 | return 0; | |
156 | } | |
157 | ||
158 | static void fl_destroy_filter(struct rcu_head *head) | |
159 | { | |
160 | struct cls_fl_filter *f = container_of(head, struct cls_fl_filter, rcu); | |
161 | ||
162 | tcf_exts_destroy(&f->exts); | |
163 | kfree(f); | |
164 | } | |
165 | ||
166 | static bool fl_destroy(struct tcf_proto *tp, bool force) | |
167 | { | |
168 | struct cls_fl_head *head = rtnl_dereference(tp->root); | |
169 | struct cls_fl_filter *f, *next; | |
170 | ||
171 | if (!force && !list_empty(&head->filters)) | |
172 | return false; | |
173 | ||
174 | list_for_each_entry_safe(f, next, &head->filters, list) { | |
175 | list_del_rcu(&f->list); | |
176 | call_rcu(&f->rcu, fl_destroy_filter); | |
177 | } | |
178 | RCU_INIT_POINTER(tp->root, NULL); | |
179 | if (head->mask_assigned) | |
180 | rhashtable_destroy(&head->ht); | |
181 | kfree_rcu(head, rcu); | |
182 | return true; | |
183 | } | |
184 | ||
185 | static unsigned long fl_get(struct tcf_proto *tp, u32 handle) | |
186 | { | |
187 | struct cls_fl_head *head = rtnl_dereference(tp->root); | |
188 | struct cls_fl_filter *f; | |
189 | ||
190 | list_for_each_entry(f, &head->filters, list) | |
191 | if (f->handle == handle) | |
192 | return (unsigned long) f; | |
193 | return 0; | |
194 | } | |
195 | ||
196 | static const struct nla_policy fl_policy[TCA_FLOWER_MAX + 1] = { | |
197 | [TCA_FLOWER_UNSPEC] = { .type = NLA_UNSPEC }, | |
198 | [TCA_FLOWER_CLASSID] = { .type = NLA_U32 }, | |
199 | [TCA_FLOWER_INDEV] = { .type = NLA_STRING, | |
200 | .len = IFNAMSIZ }, | |
201 | [TCA_FLOWER_KEY_ETH_DST] = { .len = ETH_ALEN }, | |
202 | [TCA_FLOWER_KEY_ETH_DST_MASK] = { .len = ETH_ALEN }, | |
203 | [TCA_FLOWER_KEY_ETH_SRC] = { .len = ETH_ALEN }, | |
204 | [TCA_FLOWER_KEY_ETH_SRC_MASK] = { .len = ETH_ALEN }, | |
205 | [TCA_FLOWER_KEY_ETH_TYPE] = { .type = NLA_U16 }, | |
206 | [TCA_FLOWER_KEY_IP_PROTO] = { .type = NLA_U8 }, | |
207 | [TCA_FLOWER_KEY_IPV4_SRC] = { .type = NLA_U32 }, | |
208 | [TCA_FLOWER_KEY_IPV4_SRC_MASK] = { .type = NLA_U32 }, | |
209 | [TCA_FLOWER_KEY_IPV4_DST] = { .type = NLA_U32 }, | |
210 | [TCA_FLOWER_KEY_IPV4_DST_MASK] = { .type = NLA_U32 }, | |
211 | [TCA_FLOWER_KEY_IPV6_SRC] = { .len = sizeof(struct in6_addr) }, | |
212 | [TCA_FLOWER_KEY_IPV6_SRC_MASK] = { .len = sizeof(struct in6_addr) }, | |
213 | [TCA_FLOWER_KEY_IPV6_DST] = { .len = sizeof(struct in6_addr) }, | |
214 | [TCA_FLOWER_KEY_IPV6_DST_MASK] = { .len = sizeof(struct in6_addr) }, | |
215 | [TCA_FLOWER_KEY_TCP_SRC] = { .type = NLA_U16 }, | |
216 | [TCA_FLOWER_KEY_TCP_DST] = { .type = NLA_U16 }, | |
217 | [TCA_FLOWER_KEY_TCP_SRC] = { .type = NLA_U16 }, | |
218 | [TCA_FLOWER_KEY_TCP_DST] = { .type = NLA_U16 }, | |
219 | }; | |
220 | ||
221 | static void fl_set_key_val(struct nlattr **tb, | |
222 | void *val, int val_type, | |
223 | void *mask, int mask_type, int len) | |
224 | { | |
225 | if (!tb[val_type]) | |
226 | return; | |
227 | memcpy(val, nla_data(tb[val_type]), len); | |
228 | if (mask_type == TCA_FLOWER_UNSPEC || !tb[mask_type]) | |
229 | memset(mask, 0xff, len); | |
230 | else | |
231 | memcpy(mask, nla_data(tb[mask_type]), len); | |
232 | } | |
233 | ||
234 | static int fl_set_key(struct net *net, struct nlattr **tb, | |
235 | struct fl_flow_key *key, struct fl_flow_key *mask) | |
236 | { | |
237 | int err; | |
238 | ||
239 | if (tb[TCA_FLOWER_INDEV]) { | |
240 | err = tcf_change_indev(net, tb[TCA_FLOWER_INDEV]); | |
241 | if (err < 0) | |
242 | return err; | |
243 | key->indev_ifindex = err; | |
244 | mask->indev_ifindex = 0xffffffff; | |
245 | } | |
246 | ||
247 | fl_set_key_val(tb, key->eth.dst, TCA_FLOWER_KEY_ETH_DST, | |
248 | mask->eth.dst, TCA_FLOWER_KEY_ETH_DST_MASK, | |
249 | sizeof(key->eth.dst)); | |
250 | fl_set_key_val(tb, key->eth.src, TCA_FLOWER_KEY_ETH_SRC, | |
251 | mask->eth.src, TCA_FLOWER_KEY_ETH_SRC_MASK, | |
252 | sizeof(key->eth.src)); | |
253 | fl_set_key_val(tb, &key->basic.n_proto, TCA_FLOWER_KEY_ETH_TYPE, | |
254 | &mask->basic.n_proto, TCA_FLOWER_UNSPEC, | |
255 | sizeof(key->basic.n_proto)); | |
256 | if (key->basic.n_proto == htons(ETH_P_IP) || | |
257 | key->basic.n_proto == htons(ETH_P_IPV6)) { | |
258 | fl_set_key_val(tb, &key->basic.ip_proto, TCA_FLOWER_KEY_IP_PROTO, | |
259 | &mask->basic.ip_proto, TCA_FLOWER_UNSPEC, | |
260 | sizeof(key->basic.ip_proto)); | |
261 | } | |
262 | if (key->basic.n_proto == htons(ETH_P_IP)) { | |
263 | fl_set_key_val(tb, &key->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC, | |
264 | &mask->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC_MASK, | |
265 | sizeof(key->ipv4.src)); | |
266 | fl_set_key_val(tb, &key->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST, | |
267 | &mask->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST_MASK, | |
268 | sizeof(key->ipv4.dst)); | |
269 | } else if (key->basic.n_proto == htons(ETH_P_IPV6)) { | |
270 | fl_set_key_val(tb, &key->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC, | |
271 | &mask->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC_MASK, | |
272 | sizeof(key->ipv6.src)); | |
273 | fl_set_key_val(tb, &key->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST, | |
274 | &mask->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST_MASK, | |
275 | sizeof(key->ipv6.dst)); | |
276 | } | |
277 | if (key->basic.ip_proto == IPPROTO_TCP) { | |
278 | fl_set_key_val(tb, &key->tp.src, TCA_FLOWER_KEY_TCP_SRC, | |
279 | &mask->tp.src, TCA_FLOWER_UNSPEC, | |
280 | sizeof(key->tp.src)); | |
281 | fl_set_key_val(tb, &key->tp.dst, TCA_FLOWER_KEY_TCP_DST, | |
282 | &mask->tp.dst, TCA_FLOWER_UNSPEC, | |
283 | sizeof(key->tp.dst)); | |
284 | } else if (key->basic.ip_proto == IPPROTO_UDP) { | |
285 | fl_set_key_val(tb, &key->tp.src, TCA_FLOWER_KEY_UDP_SRC, | |
286 | &mask->tp.src, TCA_FLOWER_UNSPEC, | |
287 | sizeof(key->tp.src)); | |
288 | fl_set_key_val(tb, &key->tp.dst, TCA_FLOWER_KEY_UDP_DST, | |
289 | &mask->tp.dst, TCA_FLOWER_UNSPEC, | |
290 | sizeof(key->tp.dst)); | |
291 | } | |
292 | ||
293 | return 0; | |
294 | } | |
295 | ||
296 | static bool fl_mask_eq(struct fl_flow_mask *mask1, | |
297 | struct fl_flow_mask *mask2) | |
298 | { | |
299 | const long *lmask1 = fl_key_get_start(&mask1->key, mask1); | |
300 | const long *lmask2 = fl_key_get_start(&mask2->key, mask2); | |
301 | ||
302 | return !memcmp(&mask1->range, &mask2->range, sizeof(mask1->range)) && | |
303 | !memcmp(lmask1, lmask2, fl_mask_range(mask1)); | |
304 | } | |
305 | ||
306 | static const struct rhashtable_params fl_ht_params = { | |
307 | .key_offset = offsetof(struct cls_fl_filter, mkey), /* base offset */ | |
308 | .head_offset = offsetof(struct cls_fl_filter, ht_node), | |
309 | .automatic_shrinking = true, | |
310 | }; | |
311 | ||
312 | static int fl_init_hashtable(struct cls_fl_head *head, | |
313 | struct fl_flow_mask *mask) | |
314 | { | |
315 | head->ht_params = fl_ht_params; | |
316 | head->ht_params.key_len = fl_mask_range(mask); | |
317 | head->ht_params.key_offset += mask->range.start; | |
318 | ||
319 | return rhashtable_init(&head->ht, &head->ht_params); | |
320 | } | |
321 | ||
322 | #define FL_KEY_MEMBER_OFFSET(member) offsetof(struct fl_flow_key, member) | |
323 | #define FL_KEY_MEMBER_SIZE(member) (sizeof(((struct fl_flow_key *) 0)->member)) | |
324 | #define FL_KEY_MEMBER_END_OFFSET(member) \ | |
325 | (FL_KEY_MEMBER_OFFSET(member) + FL_KEY_MEMBER_SIZE(member)) | |
326 | ||
327 | #define FL_KEY_IN_RANGE(mask, member) \ | |
328 | (FL_KEY_MEMBER_OFFSET(member) <= (mask)->range.end && \ | |
329 | FL_KEY_MEMBER_END_OFFSET(member) >= (mask)->range.start) | |
330 | ||
331 | #define FL_KEY_SET(keys, cnt, id, member) \ | |
332 | do { \ | |
333 | keys[cnt].key_id = id; \ | |
334 | keys[cnt].offset = FL_KEY_MEMBER_OFFSET(member); \ | |
335 | cnt++; \ | |
336 | } while(0); | |
337 | ||
338 | #define FL_KEY_SET_IF_IN_RANGE(mask, keys, cnt, id, member) \ | |
339 | do { \ | |
340 | if (FL_KEY_IN_RANGE(mask, member)) \ | |
341 | FL_KEY_SET(keys, cnt, id, member); \ | |
342 | } while(0); | |
343 | ||
344 | static void fl_init_dissector(struct cls_fl_head *head, | |
345 | struct fl_flow_mask *mask) | |
346 | { | |
347 | struct flow_dissector_key keys[FLOW_DISSECTOR_KEY_MAX]; | |
348 | size_t cnt = 0; | |
349 | ||
350 | FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_BASIC, basic); | |
351 | FL_KEY_SET_IF_IN_RANGE(mask, keys, cnt, | |
352 | FLOW_DISSECTOR_KEY_ETH_ADDRS, eth); | |
353 | FL_KEY_SET_IF_IN_RANGE(mask, keys, cnt, | |
354 | FLOW_DISSECTOR_KEY_IPV4_ADDRS, ipv4); | |
355 | FL_KEY_SET_IF_IN_RANGE(mask, keys, cnt, | |
356 | FLOW_DISSECTOR_KEY_IPV6_ADDRS, ipv6); | |
357 | FL_KEY_SET_IF_IN_RANGE(mask, keys, cnt, | |
358 | FLOW_DISSECTOR_KEY_PORTS, tp); | |
359 | ||
360 | skb_flow_dissector_init(&head->dissector, keys, cnt); | |
361 | } | |
362 | ||
363 | static int fl_check_assign_mask(struct cls_fl_head *head, | |
364 | struct fl_flow_mask *mask) | |
365 | { | |
366 | int err; | |
367 | ||
368 | if (head->mask_assigned) { | |
369 | if (!fl_mask_eq(&head->mask, mask)) | |
370 | return -EINVAL; | |
371 | else | |
372 | return 0; | |
373 | } | |
374 | ||
375 | /* Mask is not assigned yet. So assign it and init hashtable | |
376 | * according to that. | |
377 | */ | |
378 | err = fl_init_hashtable(head, mask); | |
379 | if (err) | |
380 | return err; | |
381 | memcpy(&head->mask, mask, sizeof(head->mask)); | |
382 | head->mask_assigned = true; | |
383 | ||
384 | fl_init_dissector(head, mask); | |
385 | ||
386 | return 0; | |
387 | } | |
388 | ||
389 | static int fl_set_parms(struct net *net, struct tcf_proto *tp, | |
390 | struct cls_fl_filter *f, struct fl_flow_mask *mask, | |
391 | unsigned long base, struct nlattr **tb, | |
392 | struct nlattr *est, bool ovr) | |
393 | { | |
394 | struct tcf_exts e; | |
395 | int err; | |
396 | ||
397 | tcf_exts_init(&e, TCA_FLOWER_ACT, 0); | |
398 | err = tcf_exts_validate(net, tp, tb, est, &e, ovr); | |
399 | if (err < 0) | |
400 | return err; | |
401 | ||
402 | if (tb[TCA_FLOWER_CLASSID]) { | |
403 | f->res.classid = nla_get_u32(tb[TCA_FLOWER_CLASSID]); | |
404 | tcf_bind_filter(tp, &f->res, base); | |
405 | } | |
406 | ||
407 | err = fl_set_key(net, tb, &f->key, &mask->key); | |
408 | if (err) | |
409 | goto errout; | |
410 | ||
411 | fl_mask_update_range(mask); | |
412 | fl_set_masked_key(&f->mkey, &f->key, mask); | |
413 | ||
414 | tcf_exts_change(tp, &f->exts, &e); | |
415 | ||
416 | return 0; | |
417 | errout: | |
418 | tcf_exts_destroy(&e); | |
419 | return err; | |
420 | } | |
421 | ||
422 | static u32 fl_grab_new_handle(struct tcf_proto *tp, | |
423 | struct cls_fl_head *head) | |
424 | { | |
425 | unsigned int i = 0x80000000; | |
426 | u32 handle; | |
427 | ||
428 | do { | |
429 | if (++head->hgen == 0x7FFFFFFF) | |
430 | head->hgen = 1; | |
431 | } while (--i > 0 && fl_get(tp, head->hgen)); | |
432 | ||
433 | if (unlikely(i == 0)) { | |
434 | pr_err("Insufficient number of handles\n"); | |
435 | handle = 0; | |
436 | } else { | |
437 | handle = head->hgen; | |
438 | } | |
439 | ||
440 | return handle; | |
441 | } | |
442 | ||
443 | static int fl_change(struct net *net, struct sk_buff *in_skb, | |
444 | struct tcf_proto *tp, unsigned long base, | |
445 | u32 handle, struct nlattr **tca, | |
446 | unsigned long *arg, bool ovr) | |
447 | { | |
448 | struct cls_fl_head *head = rtnl_dereference(tp->root); | |
449 | struct cls_fl_filter *fold = (struct cls_fl_filter *) *arg; | |
450 | struct cls_fl_filter *fnew; | |
451 | struct nlattr *tb[TCA_FLOWER_MAX + 1]; | |
452 | struct fl_flow_mask mask = {}; | |
453 | int err; | |
454 | ||
455 | if (!tca[TCA_OPTIONS]) | |
456 | return -EINVAL; | |
457 | ||
458 | err = nla_parse_nested(tb, TCA_FLOWER_MAX, tca[TCA_OPTIONS], fl_policy); | |
459 | if (err < 0) | |
460 | return err; | |
461 | ||
462 | if (fold && handle && fold->handle != handle) | |
463 | return -EINVAL; | |
464 | ||
465 | fnew = kzalloc(sizeof(*fnew), GFP_KERNEL); | |
466 | if (!fnew) | |
467 | return -ENOBUFS; | |
468 | ||
469 | tcf_exts_init(&fnew->exts, TCA_FLOWER_ACT, 0); | |
470 | ||
471 | if (!handle) { | |
472 | handle = fl_grab_new_handle(tp, head); | |
473 | if (!handle) { | |
474 | err = -EINVAL; | |
475 | goto errout; | |
476 | } | |
477 | } | |
478 | fnew->handle = handle; | |
479 | ||
480 | err = fl_set_parms(net, tp, fnew, &mask, base, tb, tca[TCA_RATE], ovr); | |
481 | if (err) | |
482 | goto errout; | |
483 | ||
484 | err = fl_check_assign_mask(head, &mask); | |
485 | if (err) | |
486 | goto errout; | |
487 | ||
488 | err = rhashtable_insert_fast(&head->ht, &fnew->ht_node, | |
489 | head->ht_params); | |
490 | if (err) | |
491 | goto errout; | |
492 | if (fold) | |
493 | rhashtable_remove_fast(&head->ht, &fold->ht_node, | |
494 | head->ht_params); | |
495 | ||
496 | *arg = (unsigned long) fnew; | |
497 | ||
498 | if (fold) { | |
499 | list_replace_rcu(&fnew->list, &fold->list); | |
500 | tcf_unbind_filter(tp, &fold->res); | |
501 | call_rcu(&fold->rcu, fl_destroy_filter); | |
502 | } else { | |
503 | list_add_tail_rcu(&fnew->list, &head->filters); | |
504 | } | |
505 | ||
506 | return 0; | |
507 | ||
508 | errout: | |
509 | kfree(fnew); | |
510 | return err; | |
511 | } | |
512 | ||
513 | static int fl_delete(struct tcf_proto *tp, unsigned long arg) | |
514 | { | |
515 | struct cls_fl_head *head = rtnl_dereference(tp->root); | |
516 | struct cls_fl_filter *f = (struct cls_fl_filter *) arg; | |
517 | ||
518 | rhashtable_remove_fast(&head->ht, &f->ht_node, | |
519 | head->ht_params); | |
520 | list_del_rcu(&f->list); | |
521 | tcf_unbind_filter(tp, &f->res); | |
522 | call_rcu(&f->rcu, fl_destroy_filter); | |
523 | return 0; | |
524 | } | |
525 | ||
526 | static void fl_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
527 | { | |
528 | struct cls_fl_head *head = rtnl_dereference(tp->root); | |
529 | struct cls_fl_filter *f; | |
530 | ||
531 | list_for_each_entry_rcu(f, &head->filters, list) { | |
532 | if (arg->count < arg->skip) | |
533 | goto skip; | |
534 | if (arg->fn(tp, (unsigned long) f, arg) < 0) { | |
535 | arg->stop = 1; | |
536 | break; | |
537 | } | |
538 | skip: | |
539 | arg->count++; | |
540 | } | |
541 | } | |
542 | ||
543 | static int fl_dump_key_val(struct sk_buff *skb, | |
544 | void *val, int val_type, | |
545 | void *mask, int mask_type, int len) | |
546 | { | |
547 | int err; | |
548 | ||
549 | if (!memchr_inv(mask, 0, len)) | |
550 | return 0; | |
551 | err = nla_put(skb, val_type, len, val); | |
552 | if (err) | |
553 | return err; | |
554 | if (mask_type != TCA_FLOWER_UNSPEC) { | |
555 | err = nla_put(skb, mask_type, len, mask); | |
556 | if (err) | |
557 | return err; | |
558 | } | |
559 | return 0; | |
560 | } | |
561 | ||
562 | static int fl_dump(struct net *net, struct tcf_proto *tp, unsigned long fh, | |
563 | struct sk_buff *skb, struct tcmsg *t) | |
564 | { | |
565 | struct cls_fl_head *head = rtnl_dereference(tp->root); | |
566 | struct cls_fl_filter *f = (struct cls_fl_filter *) fh; | |
567 | struct nlattr *nest; | |
568 | struct fl_flow_key *key, *mask; | |
569 | ||
570 | if (!f) | |
571 | return skb->len; | |
572 | ||
573 | t->tcm_handle = f->handle; | |
574 | ||
575 | nest = nla_nest_start(skb, TCA_OPTIONS); | |
576 | if (!nest) | |
577 | goto nla_put_failure; | |
578 | ||
579 | if (f->res.classid && | |
580 | nla_put_u32(skb, TCA_FLOWER_CLASSID, f->res.classid)) | |
581 | goto nla_put_failure; | |
582 | ||
583 | key = &f->key; | |
584 | mask = &head->mask.key; | |
585 | ||
586 | if (mask->indev_ifindex) { | |
587 | struct net_device *dev; | |
588 | ||
589 | dev = __dev_get_by_index(net, key->indev_ifindex); | |
590 | if (dev && nla_put_string(skb, TCA_FLOWER_INDEV, dev->name)) | |
591 | goto nla_put_failure; | |
592 | } | |
593 | ||
594 | if (fl_dump_key_val(skb, key->eth.dst, TCA_FLOWER_KEY_ETH_DST, | |
595 | mask->eth.dst, TCA_FLOWER_KEY_ETH_DST_MASK, | |
596 | sizeof(key->eth.dst)) || | |
597 | fl_dump_key_val(skb, key->eth.src, TCA_FLOWER_KEY_ETH_SRC, | |
598 | mask->eth.src, TCA_FLOWER_KEY_ETH_SRC_MASK, | |
599 | sizeof(key->eth.src)) || | |
600 | fl_dump_key_val(skb, &key->basic.n_proto, TCA_FLOWER_KEY_ETH_TYPE, | |
601 | &mask->basic.n_proto, TCA_FLOWER_UNSPEC, | |
602 | sizeof(key->basic.n_proto))) | |
603 | goto nla_put_failure; | |
604 | if ((key->basic.n_proto == htons(ETH_P_IP) || | |
605 | key->basic.n_proto == htons(ETH_P_IPV6)) && | |
606 | fl_dump_key_val(skb, &key->basic.ip_proto, TCA_FLOWER_KEY_IP_PROTO, | |
607 | &mask->basic.ip_proto, TCA_FLOWER_UNSPEC, | |
608 | sizeof(key->basic.ip_proto))) | |
609 | goto nla_put_failure; | |
610 | ||
611 | if (key->basic.n_proto == htons(ETH_P_IP) && | |
612 | (fl_dump_key_val(skb, &key->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC, | |
613 | &mask->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC_MASK, | |
614 | sizeof(key->ipv4.src)) || | |
615 | fl_dump_key_val(skb, &key->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST, | |
616 | &mask->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST_MASK, | |
617 | sizeof(key->ipv4.dst)))) | |
618 | goto nla_put_failure; | |
619 | else if (key->basic.n_proto == htons(ETH_P_IPV6) && | |
620 | (fl_dump_key_val(skb, &key->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC, | |
621 | &mask->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC_MASK, | |
622 | sizeof(key->ipv6.src)) || | |
623 | fl_dump_key_val(skb, &key->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST, | |
624 | &mask->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST_MASK, | |
625 | sizeof(key->ipv6.dst)))) | |
626 | goto nla_put_failure; | |
627 | ||
628 | if (key->basic.ip_proto == IPPROTO_TCP && | |
629 | (fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_TCP_SRC, | |
630 | &mask->tp.src, TCA_FLOWER_UNSPEC, | |
631 | sizeof(key->tp.src)) || | |
632 | fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_TCP_DST, | |
633 | &mask->tp.dst, TCA_FLOWER_UNSPEC, | |
634 | sizeof(key->tp.dst)))) | |
635 | goto nla_put_failure; | |
636 | else if (key->basic.ip_proto == IPPROTO_UDP && | |
637 | (fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_UDP_SRC, | |
638 | &mask->tp.src, TCA_FLOWER_UNSPEC, | |
639 | sizeof(key->tp.src)) || | |
640 | fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_UDP_DST, | |
641 | &mask->tp.dst, TCA_FLOWER_UNSPEC, | |
642 | sizeof(key->tp.dst)))) | |
643 | goto nla_put_failure; | |
644 | ||
645 | if (tcf_exts_dump(skb, &f->exts)) | |
646 | goto nla_put_failure; | |
647 | ||
648 | nla_nest_end(skb, nest); | |
649 | ||
650 | if (tcf_exts_dump_stats(skb, &f->exts) < 0) | |
651 | goto nla_put_failure; | |
652 | ||
653 | return skb->len; | |
654 | ||
655 | nla_put_failure: | |
656 | nla_nest_cancel(skb, nest); | |
657 | return -1; | |
658 | } | |
659 | ||
660 | static struct tcf_proto_ops cls_fl_ops __read_mostly = { | |
661 | .kind = "flower", | |
662 | .classify = fl_classify, | |
663 | .init = fl_init, | |
664 | .destroy = fl_destroy, | |
665 | .get = fl_get, | |
666 | .change = fl_change, | |
667 | .delete = fl_delete, | |
668 | .walk = fl_walk, | |
669 | .dump = fl_dump, | |
670 | .owner = THIS_MODULE, | |
671 | }; | |
672 | ||
673 | static int __init cls_fl_init(void) | |
674 | { | |
675 | return register_tcf_proto_ops(&cls_fl_ops); | |
676 | } | |
677 | ||
678 | static void __exit cls_fl_exit(void) | |
679 | { | |
680 | unregister_tcf_proto_ops(&cls_fl_ops); | |
681 | } | |
682 | ||
683 | module_init(cls_fl_init); | |
684 | module_exit(cls_fl_exit); | |
685 | ||
686 | MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>"); | |
687 | MODULE_DESCRIPTION("Flower classifier"); | |
688 | MODULE_LICENSE("GPL v2"); |