Commit | Line | Data |
---|---|---|
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; | |
42aecaa9 | 28 | struct flow_dissector_key_control control; |
77b9900e JP |
29 | struct flow_dissector_key_basic basic; |
30 | struct flow_dissector_key_eth_addrs eth; | |
c3f83241 | 31 | struct flow_dissector_key_addrs ipaddrs; |
77b9900e | 32 | union { |
c3f83241 | 33 | struct flow_dissector_key_ipv4_addrs ipv4; |
77b9900e JP |
34 | struct flow_dissector_key_ipv6_addrs ipv6; |
35 | }; | |
36 | struct flow_dissector_key_ports tp; | |
37 | } __aligned(BITS_PER_LONG / 8); /* Ensure that we can do comparisons as longs. */ | |
38 | ||
39 | struct fl_flow_mask_range { | |
40 | unsigned short int start; | |
41 | unsigned short int end; | |
42 | }; | |
43 | ||
44 | struct fl_flow_mask { | |
45 | struct fl_flow_key key; | |
46 | struct fl_flow_mask_range range; | |
47 | struct rcu_head rcu; | |
48 | }; | |
49 | ||
50 | struct cls_fl_head { | |
51 | struct rhashtable ht; | |
52 | struct fl_flow_mask mask; | |
53 | struct flow_dissector dissector; | |
54 | u32 hgen; | |
55 | bool mask_assigned; | |
56 | struct list_head filters; | |
57 | struct rhashtable_params ht_params; | |
58 | struct rcu_head rcu; | |
59 | }; | |
60 | ||
61 | struct cls_fl_filter { | |
62 | struct rhash_head ht_node; | |
63 | struct fl_flow_key mkey; | |
64 | struct tcf_exts exts; | |
65 | struct tcf_result res; | |
66 | struct fl_flow_key key; | |
67 | struct list_head list; | |
68 | u32 handle; | |
69 | struct rcu_head rcu; | |
70 | }; | |
71 | ||
72 | static unsigned short int fl_mask_range(const struct fl_flow_mask *mask) | |
73 | { | |
74 | return mask->range.end - mask->range.start; | |
75 | } | |
76 | ||
77 | static void fl_mask_update_range(struct fl_flow_mask *mask) | |
78 | { | |
79 | const u8 *bytes = (const u8 *) &mask->key; | |
80 | size_t size = sizeof(mask->key); | |
81 | size_t i, first = 0, last = size - 1; | |
82 | ||
83 | for (i = 0; i < sizeof(mask->key); i++) { | |
84 | if (bytes[i]) { | |
85 | if (!first && i) | |
86 | first = i; | |
87 | last = i; | |
88 | } | |
89 | } | |
90 | mask->range.start = rounddown(first, sizeof(long)); | |
91 | mask->range.end = roundup(last + 1, sizeof(long)); | |
92 | } | |
93 | ||
94 | static void *fl_key_get_start(struct fl_flow_key *key, | |
95 | const struct fl_flow_mask *mask) | |
96 | { | |
97 | return (u8 *) key + mask->range.start; | |
98 | } | |
99 | ||
100 | static void fl_set_masked_key(struct fl_flow_key *mkey, struct fl_flow_key *key, | |
101 | struct fl_flow_mask *mask) | |
102 | { | |
103 | const long *lkey = fl_key_get_start(key, mask); | |
104 | const long *lmask = fl_key_get_start(&mask->key, mask); | |
105 | long *lmkey = fl_key_get_start(mkey, mask); | |
106 | int i; | |
107 | ||
108 | for (i = 0; i < fl_mask_range(mask); i += sizeof(long)) | |
109 | *lmkey++ = *lkey++ & *lmask++; | |
110 | } | |
111 | ||
112 | static void fl_clear_masked_range(struct fl_flow_key *key, | |
113 | struct fl_flow_mask *mask) | |
114 | { | |
115 | memset(fl_key_get_start(key, mask), 0, fl_mask_range(mask)); | |
116 | } | |
117 | ||
118 | static int fl_classify(struct sk_buff *skb, const struct tcf_proto *tp, | |
119 | struct tcf_result *res) | |
120 | { | |
121 | struct cls_fl_head *head = rcu_dereference_bh(tp->root); | |
122 | struct cls_fl_filter *f; | |
123 | struct fl_flow_key skb_key; | |
124 | struct fl_flow_key skb_mkey; | |
125 | ||
126 | fl_clear_masked_range(&skb_key, &head->mask); | |
127 | skb_key.indev_ifindex = skb->skb_iif; | |
128 | /* skb_flow_dissect() does not set n_proto in case an unknown protocol, | |
129 | * so do it rather here. | |
130 | */ | |
131 | skb_key.basic.n_proto = skb->protocol; | |
cd79a238 | 132 | skb_flow_dissect(skb, &head->dissector, &skb_key, 0); |
77b9900e JP |
133 | |
134 | fl_set_masked_key(&skb_mkey, &skb_key, &head->mask); | |
135 | ||
136 | f = rhashtable_lookup_fast(&head->ht, | |
137 | fl_key_get_start(&skb_mkey, &head->mask), | |
138 | head->ht_params); | |
139 | if (f) { | |
140 | *res = f->res; | |
141 | return tcf_exts_exec(skb, &f->exts, res); | |
142 | } | |
143 | return -1; | |
144 | } | |
145 | ||
146 | static int fl_init(struct tcf_proto *tp) | |
147 | { | |
148 | struct cls_fl_head *head; | |
149 | ||
150 | head = kzalloc(sizeof(*head), GFP_KERNEL); | |
151 | if (!head) | |
152 | return -ENOBUFS; | |
153 | ||
154 | INIT_LIST_HEAD_RCU(&head->filters); | |
155 | rcu_assign_pointer(tp->root, head); | |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
160 | static void fl_destroy_filter(struct rcu_head *head) | |
161 | { | |
162 | struct cls_fl_filter *f = container_of(head, struct cls_fl_filter, rcu); | |
163 | ||
164 | tcf_exts_destroy(&f->exts); | |
165 | kfree(f); | |
166 | } | |
167 | ||
8208d21b | 168 | static void fl_hw_destroy_filter(struct tcf_proto *tp, unsigned long cookie) |
5b33f488 AV |
169 | { |
170 | struct net_device *dev = tp->q->dev_queue->dev; | |
171 | struct tc_cls_flower_offload offload = {0}; | |
172 | struct tc_to_netdev tc; | |
173 | ||
174 | if (!tc_should_offload(dev, 0)) | |
175 | return; | |
176 | ||
177 | offload.command = TC_CLSFLOWER_DESTROY; | |
178 | offload.cookie = cookie; | |
179 | ||
180 | tc.type = TC_SETUP_CLSFLOWER; | |
181 | tc.cls_flower = &offload; | |
182 | ||
183 | dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol, &tc); | |
184 | } | |
185 | ||
186 | static void fl_hw_replace_filter(struct tcf_proto *tp, | |
187 | struct flow_dissector *dissector, | |
188 | struct fl_flow_key *mask, | |
189 | struct fl_flow_key *key, | |
190 | struct tcf_exts *actions, | |
8208d21b | 191 | unsigned long cookie, u32 flags) |
5b33f488 AV |
192 | { |
193 | struct net_device *dev = tp->q->dev_queue->dev; | |
194 | struct tc_cls_flower_offload offload = {0}; | |
195 | struct tc_to_netdev tc; | |
196 | ||
197 | if (!tc_should_offload(dev, flags)) | |
198 | return; | |
199 | ||
200 | offload.command = TC_CLSFLOWER_REPLACE; | |
201 | offload.cookie = cookie; | |
202 | offload.dissector = dissector; | |
203 | offload.mask = mask; | |
204 | offload.key = key; | |
205 | offload.exts = actions; | |
206 | ||
207 | tc.type = TC_SETUP_CLSFLOWER; | |
208 | tc.cls_flower = &offload; | |
209 | ||
210 | dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol, &tc); | |
211 | } | |
212 | ||
77b9900e JP |
213 | static bool fl_destroy(struct tcf_proto *tp, bool force) |
214 | { | |
215 | struct cls_fl_head *head = rtnl_dereference(tp->root); | |
216 | struct cls_fl_filter *f, *next; | |
217 | ||
218 | if (!force && !list_empty(&head->filters)) | |
219 | return false; | |
220 | ||
221 | list_for_each_entry_safe(f, next, &head->filters, list) { | |
8208d21b | 222 | fl_hw_destroy_filter(tp, (unsigned long)f); |
77b9900e JP |
223 | list_del_rcu(&f->list); |
224 | call_rcu(&f->rcu, fl_destroy_filter); | |
225 | } | |
226 | RCU_INIT_POINTER(tp->root, NULL); | |
227 | if (head->mask_assigned) | |
228 | rhashtable_destroy(&head->ht); | |
229 | kfree_rcu(head, rcu); | |
230 | return true; | |
231 | } | |
232 | ||
233 | static unsigned long fl_get(struct tcf_proto *tp, u32 handle) | |
234 | { | |
235 | struct cls_fl_head *head = rtnl_dereference(tp->root); | |
236 | struct cls_fl_filter *f; | |
237 | ||
238 | list_for_each_entry(f, &head->filters, list) | |
239 | if (f->handle == handle) | |
240 | return (unsigned long) f; | |
241 | return 0; | |
242 | } | |
243 | ||
244 | static const struct nla_policy fl_policy[TCA_FLOWER_MAX + 1] = { | |
245 | [TCA_FLOWER_UNSPEC] = { .type = NLA_UNSPEC }, | |
246 | [TCA_FLOWER_CLASSID] = { .type = NLA_U32 }, | |
247 | [TCA_FLOWER_INDEV] = { .type = NLA_STRING, | |
248 | .len = IFNAMSIZ }, | |
249 | [TCA_FLOWER_KEY_ETH_DST] = { .len = ETH_ALEN }, | |
250 | [TCA_FLOWER_KEY_ETH_DST_MASK] = { .len = ETH_ALEN }, | |
251 | [TCA_FLOWER_KEY_ETH_SRC] = { .len = ETH_ALEN }, | |
252 | [TCA_FLOWER_KEY_ETH_SRC_MASK] = { .len = ETH_ALEN }, | |
253 | [TCA_FLOWER_KEY_ETH_TYPE] = { .type = NLA_U16 }, | |
254 | [TCA_FLOWER_KEY_IP_PROTO] = { .type = NLA_U8 }, | |
255 | [TCA_FLOWER_KEY_IPV4_SRC] = { .type = NLA_U32 }, | |
256 | [TCA_FLOWER_KEY_IPV4_SRC_MASK] = { .type = NLA_U32 }, | |
257 | [TCA_FLOWER_KEY_IPV4_DST] = { .type = NLA_U32 }, | |
258 | [TCA_FLOWER_KEY_IPV4_DST_MASK] = { .type = NLA_U32 }, | |
259 | [TCA_FLOWER_KEY_IPV6_SRC] = { .len = sizeof(struct in6_addr) }, | |
260 | [TCA_FLOWER_KEY_IPV6_SRC_MASK] = { .len = sizeof(struct in6_addr) }, | |
261 | [TCA_FLOWER_KEY_IPV6_DST] = { .len = sizeof(struct in6_addr) }, | |
262 | [TCA_FLOWER_KEY_IPV6_DST_MASK] = { .len = sizeof(struct in6_addr) }, | |
263 | [TCA_FLOWER_KEY_TCP_SRC] = { .type = NLA_U16 }, | |
264 | [TCA_FLOWER_KEY_TCP_DST] = { .type = NLA_U16 }, | |
b175c3a4 JHS |
265 | [TCA_FLOWER_KEY_UDP_SRC] = { .type = NLA_U16 }, |
266 | [TCA_FLOWER_KEY_UDP_DST] = { .type = NLA_U16 }, | |
77b9900e JP |
267 | }; |
268 | ||
269 | static void fl_set_key_val(struct nlattr **tb, | |
270 | void *val, int val_type, | |
271 | void *mask, int mask_type, int len) | |
272 | { | |
273 | if (!tb[val_type]) | |
274 | return; | |
275 | memcpy(val, nla_data(tb[val_type]), len); | |
276 | if (mask_type == TCA_FLOWER_UNSPEC || !tb[mask_type]) | |
277 | memset(mask, 0xff, len); | |
278 | else | |
279 | memcpy(mask, nla_data(tb[mask_type]), len); | |
280 | } | |
281 | ||
282 | static int fl_set_key(struct net *net, struct nlattr **tb, | |
283 | struct fl_flow_key *key, struct fl_flow_key *mask) | |
284 | { | |
dd3aa3b5 | 285 | #ifdef CONFIG_NET_CLS_IND |
77b9900e | 286 | if (tb[TCA_FLOWER_INDEV]) { |
dd3aa3b5 | 287 | int err = tcf_change_indev(net, tb[TCA_FLOWER_INDEV]); |
77b9900e JP |
288 | if (err < 0) |
289 | return err; | |
290 | key->indev_ifindex = err; | |
291 | mask->indev_ifindex = 0xffffffff; | |
292 | } | |
dd3aa3b5 | 293 | #endif |
77b9900e JP |
294 | |
295 | fl_set_key_val(tb, key->eth.dst, TCA_FLOWER_KEY_ETH_DST, | |
296 | mask->eth.dst, TCA_FLOWER_KEY_ETH_DST_MASK, | |
297 | sizeof(key->eth.dst)); | |
298 | fl_set_key_val(tb, key->eth.src, TCA_FLOWER_KEY_ETH_SRC, | |
299 | mask->eth.src, TCA_FLOWER_KEY_ETH_SRC_MASK, | |
300 | sizeof(key->eth.src)); | |
66530bdf | 301 | |
77b9900e JP |
302 | fl_set_key_val(tb, &key->basic.n_proto, TCA_FLOWER_KEY_ETH_TYPE, |
303 | &mask->basic.n_proto, TCA_FLOWER_UNSPEC, | |
304 | sizeof(key->basic.n_proto)); | |
66530bdf | 305 | |
77b9900e JP |
306 | if (key->basic.n_proto == htons(ETH_P_IP) || |
307 | key->basic.n_proto == htons(ETH_P_IPV6)) { | |
308 | fl_set_key_val(tb, &key->basic.ip_proto, TCA_FLOWER_KEY_IP_PROTO, | |
309 | &mask->basic.ip_proto, TCA_FLOWER_UNSPEC, | |
310 | sizeof(key->basic.ip_proto)); | |
311 | } | |
66530bdf JHS |
312 | |
313 | if (tb[TCA_FLOWER_KEY_IPV4_SRC] || tb[TCA_FLOWER_KEY_IPV4_DST]) { | |
314 | key->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
77b9900e JP |
315 | fl_set_key_val(tb, &key->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC, |
316 | &mask->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC_MASK, | |
317 | sizeof(key->ipv4.src)); | |
318 | fl_set_key_val(tb, &key->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST, | |
319 | &mask->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST_MASK, | |
320 | sizeof(key->ipv4.dst)); | |
66530bdf JHS |
321 | } else if (tb[TCA_FLOWER_KEY_IPV6_SRC] || tb[TCA_FLOWER_KEY_IPV6_DST]) { |
322 | key->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
77b9900e JP |
323 | fl_set_key_val(tb, &key->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC, |
324 | &mask->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC_MASK, | |
325 | sizeof(key->ipv6.src)); | |
326 | fl_set_key_val(tb, &key->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST, | |
327 | &mask->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST_MASK, | |
328 | sizeof(key->ipv6.dst)); | |
329 | } | |
66530bdf | 330 | |
77b9900e JP |
331 | if (key->basic.ip_proto == IPPROTO_TCP) { |
332 | fl_set_key_val(tb, &key->tp.src, TCA_FLOWER_KEY_TCP_SRC, | |
333 | &mask->tp.src, TCA_FLOWER_UNSPEC, | |
334 | sizeof(key->tp.src)); | |
335 | fl_set_key_val(tb, &key->tp.dst, TCA_FLOWER_KEY_TCP_DST, | |
336 | &mask->tp.dst, TCA_FLOWER_UNSPEC, | |
337 | sizeof(key->tp.dst)); | |
338 | } else if (key->basic.ip_proto == IPPROTO_UDP) { | |
339 | fl_set_key_val(tb, &key->tp.src, TCA_FLOWER_KEY_UDP_SRC, | |
340 | &mask->tp.src, TCA_FLOWER_UNSPEC, | |
341 | sizeof(key->tp.src)); | |
342 | fl_set_key_val(tb, &key->tp.dst, TCA_FLOWER_KEY_UDP_DST, | |
343 | &mask->tp.dst, TCA_FLOWER_UNSPEC, | |
344 | sizeof(key->tp.dst)); | |
345 | } | |
346 | ||
347 | return 0; | |
348 | } | |
349 | ||
350 | static bool fl_mask_eq(struct fl_flow_mask *mask1, | |
351 | struct fl_flow_mask *mask2) | |
352 | { | |
353 | const long *lmask1 = fl_key_get_start(&mask1->key, mask1); | |
354 | const long *lmask2 = fl_key_get_start(&mask2->key, mask2); | |
355 | ||
356 | return !memcmp(&mask1->range, &mask2->range, sizeof(mask1->range)) && | |
357 | !memcmp(lmask1, lmask2, fl_mask_range(mask1)); | |
358 | } | |
359 | ||
360 | static const struct rhashtable_params fl_ht_params = { | |
361 | .key_offset = offsetof(struct cls_fl_filter, mkey), /* base offset */ | |
362 | .head_offset = offsetof(struct cls_fl_filter, ht_node), | |
363 | .automatic_shrinking = true, | |
364 | }; | |
365 | ||
366 | static int fl_init_hashtable(struct cls_fl_head *head, | |
367 | struct fl_flow_mask *mask) | |
368 | { | |
369 | head->ht_params = fl_ht_params; | |
370 | head->ht_params.key_len = fl_mask_range(mask); | |
371 | head->ht_params.key_offset += mask->range.start; | |
372 | ||
373 | return rhashtable_init(&head->ht, &head->ht_params); | |
374 | } | |
375 | ||
376 | #define FL_KEY_MEMBER_OFFSET(member) offsetof(struct fl_flow_key, member) | |
377 | #define FL_KEY_MEMBER_SIZE(member) (sizeof(((struct fl_flow_key *) 0)->member)) | |
378 | #define FL_KEY_MEMBER_END_OFFSET(member) \ | |
379 | (FL_KEY_MEMBER_OFFSET(member) + FL_KEY_MEMBER_SIZE(member)) | |
380 | ||
381 | #define FL_KEY_IN_RANGE(mask, member) \ | |
382 | (FL_KEY_MEMBER_OFFSET(member) <= (mask)->range.end && \ | |
383 | FL_KEY_MEMBER_END_OFFSET(member) >= (mask)->range.start) | |
384 | ||
385 | #define FL_KEY_SET(keys, cnt, id, member) \ | |
386 | do { \ | |
387 | keys[cnt].key_id = id; \ | |
388 | keys[cnt].offset = FL_KEY_MEMBER_OFFSET(member); \ | |
389 | cnt++; \ | |
390 | } while(0); | |
391 | ||
392 | #define FL_KEY_SET_IF_IN_RANGE(mask, keys, cnt, id, member) \ | |
393 | do { \ | |
394 | if (FL_KEY_IN_RANGE(mask, member)) \ | |
395 | FL_KEY_SET(keys, cnt, id, member); \ | |
396 | } while(0); | |
397 | ||
398 | static void fl_init_dissector(struct cls_fl_head *head, | |
399 | struct fl_flow_mask *mask) | |
400 | { | |
401 | struct flow_dissector_key keys[FLOW_DISSECTOR_KEY_MAX]; | |
402 | size_t cnt = 0; | |
403 | ||
42aecaa9 | 404 | FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_CONTROL, control); |
77b9900e JP |
405 | FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_BASIC, basic); |
406 | FL_KEY_SET_IF_IN_RANGE(mask, keys, cnt, | |
407 | FLOW_DISSECTOR_KEY_ETH_ADDRS, eth); | |
408 | FL_KEY_SET_IF_IN_RANGE(mask, keys, cnt, | |
409 | FLOW_DISSECTOR_KEY_IPV4_ADDRS, ipv4); | |
410 | FL_KEY_SET_IF_IN_RANGE(mask, keys, cnt, | |
411 | FLOW_DISSECTOR_KEY_IPV6_ADDRS, ipv6); | |
412 | FL_KEY_SET_IF_IN_RANGE(mask, keys, cnt, | |
413 | FLOW_DISSECTOR_KEY_PORTS, tp); | |
414 | ||
415 | skb_flow_dissector_init(&head->dissector, keys, cnt); | |
416 | } | |
417 | ||
418 | static int fl_check_assign_mask(struct cls_fl_head *head, | |
419 | struct fl_flow_mask *mask) | |
420 | { | |
421 | int err; | |
422 | ||
423 | if (head->mask_assigned) { | |
424 | if (!fl_mask_eq(&head->mask, mask)) | |
425 | return -EINVAL; | |
426 | else | |
427 | return 0; | |
428 | } | |
429 | ||
430 | /* Mask is not assigned yet. So assign it and init hashtable | |
431 | * according to that. | |
432 | */ | |
433 | err = fl_init_hashtable(head, mask); | |
434 | if (err) | |
435 | return err; | |
436 | memcpy(&head->mask, mask, sizeof(head->mask)); | |
437 | head->mask_assigned = true; | |
438 | ||
439 | fl_init_dissector(head, mask); | |
440 | ||
441 | return 0; | |
442 | } | |
443 | ||
444 | static int fl_set_parms(struct net *net, struct tcf_proto *tp, | |
445 | struct cls_fl_filter *f, struct fl_flow_mask *mask, | |
446 | unsigned long base, struct nlattr **tb, | |
447 | struct nlattr *est, bool ovr) | |
448 | { | |
449 | struct tcf_exts e; | |
450 | int err; | |
451 | ||
452 | tcf_exts_init(&e, TCA_FLOWER_ACT, 0); | |
453 | err = tcf_exts_validate(net, tp, tb, est, &e, ovr); | |
454 | if (err < 0) | |
455 | return err; | |
456 | ||
457 | if (tb[TCA_FLOWER_CLASSID]) { | |
458 | f->res.classid = nla_get_u32(tb[TCA_FLOWER_CLASSID]); | |
459 | tcf_bind_filter(tp, &f->res, base); | |
460 | } | |
461 | ||
462 | err = fl_set_key(net, tb, &f->key, &mask->key); | |
463 | if (err) | |
464 | goto errout; | |
465 | ||
466 | fl_mask_update_range(mask); | |
467 | fl_set_masked_key(&f->mkey, &f->key, mask); | |
468 | ||
469 | tcf_exts_change(tp, &f->exts, &e); | |
470 | ||
471 | return 0; | |
472 | errout: | |
473 | tcf_exts_destroy(&e); | |
474 | return err; | |
475 | } | |
476 | ||
477 | static u32 fl_grab_new_handle(struct tcf_proto *tp, | |
478 | struct cls_fl_head *head) | |
479 | { | |
480 | unsigned int i = 0x80000000; | |
481 | u32 handle; | |
482 | ||
483 | do { | |
484 | if (++head->hgen == 0x7FFFFFFF) | |
485 | head->hgen = 1; | |
486 | } while (--i > 0 && fl_get(tp, head->hgen)); | |
487 | ||
488 | if (unlikely(i == 0)) { | |
489 | pr_err("Insufficient number of handles\n"); | |
490 | handle = 0; | |
491 | } else { | |
492 | handle = head->hgen; | |
493 | } | |
494 | ||
495 | return handle; | |
496 | } | |
497 | ||
498 | static int fl_change(struct net *net, struct sk_buff *in_skb, | |
499 | struct tcf_proto *tp, unsigned long base, | |
500 | u32 handle, struct nlattr **tca, | |
501 | unsigned long *arg, bool ovr) | |
502 | { | |
503 | struct cls_fl_head *head = rtnl_dereference(tp->root); | |
504 | struct cls_fl_filter *fold = (struct cls_fl_filter *) *arg; | |
505 | struct cls_fl_filter *fnew; | |
506 | struct nlattr *tb[TCA_FLOWER_MAX + 1]; | |
507 | struct fl_flow_mask mask = {}; | |
5b33f488 | 508 | u32 flags = 0; |
77b9900e JP |
509 | int err; |
510 | ||
511 | if (!tca[TCA_OPTIONS]) | |
512 | return -EINVAL; | |
513 | ||
514 | err = nla_parse_nested(tb, TCA_FLOWER_MAX, tca[TCA_OPTIONS], fl_policy); | |
515 | if (err < 0) | |
516 | return err; | |
517 | ||
518 | if (fold && handle && fold->handle != handle) | |
519 | return -EINVAL; | |
520 | ||
521 | fnew = kzalloc(sizeof(*fnew), GFP_KERNEL); | |
522 | if (!fnew) | |
523 | return -ENOBUFS; | |
524 | ||
525 | tcf_exts_init(&fnew->exts, TCA_FLOWER_ACT, 0); | |
526 | ||
527 | if (!handle) { | |
528 | handle = fl_grab_new_handle(tp, head); | |
529 | if (!handle) { | |
530 | err = -EINVAL; | |
531 | goto errout; | |
532 | } | |
533 | } | |
534 | fnew->handle = handle; | |
535 | ||
5b33f488 AV |
536 | if (tb[TCA_FLOWER_FLAGS]) |
537 | flags = nla_get_u32(tb[TCA_FLOWER_FLAGS]); | |
538 | ||
77b9900e JP |
539 | err = fl_set_parms(net, tp, fnew, &mask, base, tb, tca[TCA_RATE], ovr); |
540 | if (err) | |
541 | goto errout; | |
542 | ||
543 | err = fl_check_assign_mask(head, &mask); | |
544 | if (err) | |
545 | goto errout; | |
546 | ||
547 | err = rhashtable_insert_fast(&head->ht, &fnew->ht_node, | |
548 | head->ht_params); | |
549 | if (err) | |
550 | goto errout; | |
5b33f488 AV |
551 | |
552 | fl_hw_replace_filter(tp, | |
553 | &head->dissector, | |
554 | &mask.key, | |
555 | &fnew->key, | |
556 | &fnew->exts, | |
8208d21b | 557 | (unsigned long)fnew, |
5b33f488 AV |
558 | flags); |
559 | ||
560 | if (fold) { | |
77b9900e JP |
561 | rhashtable_remove_fast(&head->ht, &fold->ht_node, |
562 | head->ht_params); | |
8208d21b | 563 | fl_hw_destroy_filter(tp, (unsigned long)fold); |
5b33f488 | 564 | } |
77b9900e JP |
565 | |
566 | *arg = (unsigned long) fnew; | |
567 | ||
568 | if (fold) { | |
ff3532f2 | 569 | list_replace_rcu(&fold->list, &fnew->list); |
77b9900e JP |
570 | tcf_unbind_filter(tp, &fold->res); |
571 | call_rcu(&fold->rcu, fl_destroy_filter); | |
572 | } else { | |
573 | list_add_tail_rcu(&fnew->list, &head->filters); | |
574 | } | |
575 | ||
576 | return 0; | |
577 | ||
578 | errout: | |
579 | kfree(fnew); | |
580 | return err; | |
581 | } | |
582 | ||
583 | static int fl_delete(struct tcf_proto *tp, unsigned long arg) | |
584 | { | |
585 | struct cls_fl_head *head = rtnl_dereference(tp->root); | |
586 | struct cls_fl_filter *f = (struct cls_fl_filter *) arg; | |
587 | ||
588 | rhashtable_remove_fast(&head->ht, &f->ht_node, | |
589 | head->ht_params); | |
590 | list_del_rcu(&f->list); | |
8208d21b | 591 | fl_hw_destroy_filter(tp, (unsigned long)f); |
77b9900e JP |
592 | tcf_unbind_filter(tp, &f->res); |
593 | call_rcu(&f->rcu, fl_destroy_filter); | |
594 | return 0; | |
595 | } | |
596 | ||
597 | static void fl_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
598 | { | |
599 | struct cls_fl_head *head = rtnl_dereference(tp->root); | |
600 | struct cls_fl_filter *f; | |
601 | ||
602 | list_for_each_entry_rcu(f, &head->filters, list) { | |
603 | if (arg->count < arg->skip) | |
604 | goto skip; | |
605 | if (arg->fn(tp, (unsigned long) f, arg) < 0) { | |
606 | arg->stop = 1; | |
607 | break; | |
608 | } | |
609 | skip: | |
610 | arg->count++; | |
611 | } | |
612 | } | |
613 | ||
614 | static int fl_dump_key_val(struct sk_buff *skb, | |
615 | void *val, int val_type, | |
616 | void *mask, int mask_type, int len) | |
617 | { | |
618 | int err; | |
619 | ||
620 | if (!memchr_inv(mask, 0, len)) | |
621 | return 0; | |
622 | err = nla_put(skb, val_type, len, val); | |
623 | if (err) | |
624 | return err; | |
625 | if (mask_type != TCA_FLOWER_UNSPEC) { | |
626 | err = nla_put(skb, mask_type, len, mask); | |
627 | if (err) | |
628 | return err; | |
629 | } | |
630 | return 0; | |
631 | } | |
632 | ||
633 | static int fl_dump(struct net *net, struct tcf_proto *tp, unsigned long fh, | |
634 | struct sk_buff *skb, struct tcmsg *t) | |
635 | { | |
636 | struct cls_fl_head *head = rtnl_dereference(tp->root); | |
637 | struct cls_fl_filter *f = (struct cls_fl_filter *) fh; | |
638 | struct nlattr *nest; | |
639 | struct fl_flow_key *key, *mask; | |
640 | ||
641 | if (!f) | |
642 | return skb->len; | |
643 | ||
644 | t->tcm_handle = f->handle; | |
645 | ||
646 | nest = nla_nest_start(skb, TCA_OPTIONS); | |
647 | if (!nest) | |
648 | goto nla_put_failure; | |
649 | ||
650 | if (f->res.classid && | |
651 | nla_put_u32(skb, TCA_FLOWER_CLASSID, f->res.classid)) | |
652 | goto nla_put_failure; | |
653 | ||
654 | key = &f->key; | |
655 | mask = &head->mask.key; | |
656 | ||
657 | if (mask->indev_ifindex) { | |
658 | struct net_device *dev; | |
659 | ||
660 | dev = __dev_get_by_index(net, key->indev_ifindex); | |
661 | if (dev && nla_put_string(skb, TCA_FLOWER_INDEV, dev->name)) | |
662 | goto nla_put_failure; | |
663 | } | |
664 | ||
665 | if (fl_dump_key_val(skb, key->eth.dst, TCA_FLOWER_KEY_ETH_DST, | |
666 | mask->eth.dst, TCA_FLOWER_KEY_ETH_DST_MASK, | |
667 | sizeof(key->eth.dst)) || | |
668 | fl_dump_key_val(skb, key->eth.src, TCA_FLOWER_KEY_ETH_SRC, | |
669 | mask->eth.src, TCA_FLOWER_KEY_ETH_SRC_MASK, | |
670 | sizeof(key->eth.src)) || | |
671 | fl_dump_key_val(skb, &key->basic.n_proto, TCA_FLOWER_KEY_ETH_TYPE, | |
672 | &mask->basic.n_proto, TCA_FLOWER_UNSPEC, | |
673 | sizeof(key->basic.n_proto))) | |
674 | goto nla_put_failure; | |
675 | if ((key->basic.n_proto == htons(ETH_P_IP) || | |
676 | key->basic.n_proto == htons(ETH_P_IPV6)) && | |
677 | fl_dump_key_val(skb, &key->basic.ip_proto, TCA_FLOWER_KEY_IP_PROTO, | |
678 | &mask->basic.ip_proto, TCA_FLOWER_UNSPEC, | |
679 | sizeof(key->basic.ip_proto))) | |
680 | goto nla_put_failure; | |
681 | ||
c3f83241 | 682 | if (key->control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS && |
77b9900e JP |
683 | (fl_dump_key_val(skb, &key->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC, |
684 | &mask->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC_MASK, | |
685 | sizeof(key->ipv4.src)) || | |
686 | fl_dump_key_val(skb, &key->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST, | |
687 | &mask->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST_MASK, | |
688 | sizeof(key->ipv4.dst)))) | |
689 | goto nla_put_failure; | |
c3f83241 | 690 | else if (key->control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS && |
77b9900e JP |
691 | (fl_dump_key_val(skb, &key->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC, |
692 | &mask->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC_MASK, | |
693 | sizeof(key->ipv6.src)) || | |
694 | fl_dump_key_val(skb, &key->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST, | |
695 | &mask->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST_MASK, | |
696 | sizeof(key->ipv6.dst)))) | |
697 | goto nla_put_failure; | |
698 | ||
699 | if (key->basic.ip_proto == IPPROTO_TCP && | |
700 | (fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_TCP_SRC, | |
701 | &mask->tp.src, TCA_FLOWER_UNSPEC, | |
702 | sizeof(key->tp.src)) || | |
703 | fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_TCP_DST, | |
704 | &mask->tp.dst, TCA_FLOWER_UNSPEC, | |
705 | sizeof(key->tp.dst)))) | |
706 | goto nla_put_failure; | |
707 | else if (key->basic.ip_proto == IPPROTO_UDP && | |
708 | (fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_UDP_SRC, | |
709 | &mask->tp.src, TCA_FLOWER_UNSPEC, | |
710 | sizeof(key->tp.src)) || | |
711 | fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_UDP_DST, | |
712 | &mask->tp.dst, TCA_FLOWER_UNSPEC, | |
713 | sizeof(key->tp.dst)))) | |
714 | goto nla_put_failure; | |
715 | ||
716 | if (tcf_exts_dump(skb, &f->exts)) | |
717 | goto nla_put_failure; | |
718 | ||
719 | nla_nest_end(skb, nest); | |
720 | ||
721 | if (tcf_exts_dump_stats(skb, &f->exts) < 0) | |
722 | goto nla_put_failure; | |
723 | ||
724 | return skb->len; | |
725 | ||
726 | nla_put_failure: | |
727 | nla_nest_cancel(skb, nest); | |
728 | return -1; | |
729 | } | |
730 | ||
731 | static struct tcf_proto_ops cls_fl_ops __read_mostly = { | |
732 | .kind = "flower", | |
733 | .classify = fl_classify, | |
734 | .init = fl_init, | |
735 | .destroy = fl_destroy, | |
736 | .get = fl_get, | |
737 | .change = fl_change, | |
738 | .delete = fl_delete, | |
739 | .walk = fl_walk, | |
740 | .dump = fl_dump, | |
741 | .owner = THIS_MODULE, | |
742 | }; | |
743 | ||
744 | static int __init cls_fl_init(void) | |
745 | { | |
746 | return register_tcf_proto_ops(&cls_fl_ops); | |
747 | } | |
748 | ||
749 | static void __exit cls_fl_exit(void) | |
750 | { | |
751 | unregister_tcf_proto_ops(&cls_fl_ops); | |
752 | } | |
753 | ||
754 | module_init(cls_fl_init); | |
755 | module_exit(cls_fl_exit); | |
756 | ||
757 | MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>"); | |
758 | MODULE_DESCRIPTION("Flower classifier"); | |
759 | MODULE_LICENSE("GPL v2"); |