Commit | Line | Data |
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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; | |
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; | |
e69985c6 | 69 | u32 flags; |
77b9900e JP |
70 | struct rcu_head rcu; |
71 | }; | |
72 | ||
73 | static unsigned short int fl_mask_range(const struct fl_flow_mask *mask) | |
74 | { | |
75 | return mask->range.end - mask->range.start; | |
76 | } | |
77 | ||
78 | static void fl_mask_update_range(struct fl_flow_mask *mask) | |
79 | { | |
80 | const u8 *bytes = (const u8 *) &mask->key; | |
81 | size_t size = sizeof(mask->key); | |
82 | size_t i, first = 0, last = size - 1; | |
83 | ||
84 | for (i = 0; i < sizeof(mask->key); i++) { | |
85 | if (bytes[i]) { | |
86 | if (!first && i) | |
87 | first = i; | |
88 | last = i; | |
89 | } | |
90 | } | |
91 | mask->range.start = rounddown(first, sizeof(long)); | |
92 | mask->range.end = roundup(last + 1, sizeof(long)); | |
93 | } | |
94 | ||
95 | static void *fl_key_get_start(struct fl_flow_key *key, | |
96 | const struct fl_flow_mask *mask) | |
97 | { | |
98 | return (u8 *) key + mask->range.start; | |
99 | } | |
100 | ||
101 | static void fl_set_masked_key(struct fl_flow_key *mkey, struct fl_flow_key *key, | |
102 | struct fl_flow_mask *mask) | |
103 | { | |
104 | const long *lkey = fl_key_get_start(key, mask); | |
105 | const long *lmask = fl_key_get_start(&mask->key, mask); | |
106 | long *lmkey = fl_key_get_start(mkey, mask); | |
107 | int i; | |
108 | ||
109 | for (i = 0; i < fl_mask_range(mask); i += sizeof(long)) | |
110 | *lmkey++ = *lkey++ & *lmask++; | |
111 | } | |
112 | ||
113 | static void fl_clear_masked_range(struct fl_flow_key *key, | |
114 | struct fl_flow_mask *mask) | |
115 | { | |
116 | memset(fl_key_get_start(key, mask), 0, fl_mask_range(mask)); | |
117 | } | |
118 | ||
119 | static int fl_classify(struct sk_buff *skb, const struct tcf_proto *tp, | |
120 | struct tcf_result *res) | |
121 | { | |
122 | struct cls_fl_head *head = rcu_dereference_bh(tp->root); | |
123 | struct cls_fl_filter *f; | |
124 | struct fl_flow_key skb_key; | |
125 | struct fl_flow_key skb_mkey; | |
126 | ||
e69985c6 AV |
127 | if (!atomic_read(&head->ht.nelems)) |
128 | return -1; | |
129 | ||
77b9900e JP |
130 | fl_clear_masked_range(&skb_key, &head->mask); |
131 | skb_key.indev_ifindex = skb->skb_iif; | |
132 | /* skb_flow_dissect() does not set n_proto in case an unknown protocol, | |
133 | * so do it rather here. | |
134 | */ | |
135 | skb_key.basic.n_proto = skb->protocol; | |
cd79a238 | 136 | skb_flow_dissect(skb, &head->dissector, &skb_key, 0); |
77b9900e JP |
137 | |
138 | fl_set_masked_key(&skb_mkey, &skb_key, &head->mask); | |
139 | ||
140 | f = rhashtable_lookup_fast(&head->ht, | |
141 | fl_key_get_start(&skb_mkey, &head->mask), | |
142 | head->ht_params); | |
e69985c6 | 143 | if (f && !(f->flags & TCA_CLS_FLAGS_SKIP_SW)) { |
77b9900e JP |
144 | *res = f->res; |
145 | return tcf_exts_exec(skb, &f->exts, res); | |
146 | } | |
147 | return -1; | |
148 | } | |
149 | ||
150 | static int fl_init(struct tcf_proto *tp) | |
151 | { | |
152 | struct cls_fl_head *head; | |
153 | ||
154 | head = kzalloc(sizeof(*head), GFP_KERNEL); | |
155 | if (!head) | |
156 | return -ENOBUFS; | |
157 | ||
158 | INIT_LIST_HEAD_RCU(&head->filters); | |
159 | rcu_assign_pointer(tp->root, head); | |
160 | ||
161 | return 0; | |
162 | } | |
163 | ||
164 | static void fl_destroy_filter(struct rcu_head *head) | |
165 | { | |
166 | struct cls_fl_filter *f = container_of(head, struct cls_fl_filter, rcu); | |
167 | ||
168 | tcf_exts_destroy(&f->exts); | |
169 | kfree(f); | |
170 | } | |
171 | ||
8208d21b | 172 | static void fl_hw_destroy_filter(struct tcf_proto *tp, unsigned long cookie) |
5b33f488 AV |
173 | { |
174 | struct net_device *dev = tp->q->dev_queue->dev; | |
175 | struct tc_cls_flower_offload offload = {0}; | |
176 | struct tc_to_netdev tc; | |
177 | ||
92c075db | 178 | if (!tc_should_offload(dev, tp, 0)) |
5b33f488 AV |
179 | return; |
180 | ||
181 | offload.command = TC_CLSFLOWER_DESTROY; | |
182 | offload.cookie = cookie; | |
183 | ||
184 | tc.type = TC_SETUP_CLSFLOWER; | |
185 | tc.cls_flower = &offload; | |
186 | ||
187 | dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol, &tc); | |
188 | } | |
189 | ||
190 | static void fl_hw_replace_filter(struct tcf_proto *tp, | |
191 | struct flow_dissector *dissector, | |
192 | struct fl_flow_key *mask, | |
193 | struct fl_flow_key *key, | |
194 | struct tcf_exts *actions, | |
8208d21b | 195 | unsigned long cookie, u32 flags) |
5b33f488 AV |
196 | { |
197 | struct net_device *dev = tp->q->dev_queue->dev; | |
198 | struct tc_cls_flower_offload offload = {0}; | |
199 | struct tc_to_netdev tc; | |
200 | ||
92c075db | 201 | if (!tc_should_offload(dev, tp, flags)) |
5b33f488 AV |
202 | return; |
203 | ||
204 | offload.command = TC_CLSFLOWER_REPLACE; | |
205 | offload.cookie = cookie; | |
206 | offload.dissector = dissector; | |
207 | offload.mask = mask; | |
208 | offload.key = key; | |
209 | offload.exts = actions; | |
210 | ||
211 | tc.type = TC_SETUP_CLSFLOWER; | |
212 | tc.cls_flower = &offload; | |
213 | ||
214 | dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol, &tc); | |
215 | } | |
216 | ||
10cbc684 AV |
217 | static void fl_hw_update_stats(struct tcf_proto *tp, struct cls_fl_filter *f) |
218 | { | |
219 | struct net_device *dev = tp->q->dev_queue->dev; | |
220 | struct tc_cls_flower_offload offload = {0}; | |
221 | struct tc_to_netdev tc; | |
222 | ||
92c075db | 223 | if (!tc_should_offload(dev, tp, 0)) |
10cbc684 AV |
224 | return; |
225 | ||
226 | offload.command = TC_CLSFLOWER_STATS; | |
227 | offload.cookie = (unsigned long)f; | |
228 | offload.exts = &f->exts; | |
229 | ||
230 | tc.type = TC_SETUP_CLSFLOWER; | |
231 | tc.cls_flower = &offload; | |
232 | ||
233 | dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol, &tc); | |
234 | } | |
235 | ||
77b9900e JP |
236 | static bool fl_destroy(struct tcf_proto *tp, bool force) |
237 | { | |
238 | struct cls_fl_head *head = rtnl_dereference(tp->root); | |
239 | struct cls_fl_filter *f, *next; | |
240 | ||
241 | if (!force && !list_empty(&head->filters)) | |
242 | return false; | |
243 | ||
244 | list_for_each_entry_safe(f, next, &head->filters, list) { | |
8208d21b | 245 | fl_hw_destroy_filter(tp, (unsigned long)f); |
77b9900e JP |
246 | list_del_rcu(&f->list); |
247 | call_rcu(&f->rcu, fl_destroy_filter); | |
248 | } | |
249 | RCU_INIT_POINTER(tp->root, NULL); | |
250 | if (head->mask_assigned) | |
251 | rhashtable_destroy(&head->ht); | |
252 | kfree_rcu(head, rcu); | |
253 | return true; | |
254 | } | |
255 | ||
256 | static unsigned long fl_get(struct tcf_proto *tp, u32 handle) | |
257 | { | |
258 | struct cls_fl_head *head = rtnl_dereference(tp->root); | |
259 | struct cls_fl_filter *f; | |
260 | ||
261 | list_for_each_entry(f, &head->filters, list) | |
262 | if (f->handle == handle) | |
263 | return (unsigned long) f; | |
264 | return 0; | |
265 | } | |
266 | ||
267 | static const struct nla_policy fl_policy[TCA_FLOWER_MAX + 1] = { | |
268 | [TCA_FLOWER_UNSPEC] = { .type = NLA_UNSPEC }, | |
269 | [TCA_FLOWER_CLASSID] = { .type = NLA_U32 }, | |
270 | [TCA_FLOWER_INDEV] = { .type = NLA_STRING, | |
271 | .len = IFNAMSIZ }, | |
272 | [TCA_FLOWER_KEY_ETH_DST] = { .len = ETH_ALEN }, | |
273 | [TCA_FLOWER_KEY_ETH_DST_MASK] = { .len = ETH_ALEN }, | |
274 | [TCA_FLOWER_KEY_ETH_SRC] = { .len = ETH_ALEN }, | |
275 | [TCA_FLOWER_KEY_ETH_SRC_MASK] = { .len = ETH_ALEN }, | |
276 | [TCA_FLOWER_KEY_ETH_TYPE] = { .type = NLA_U16 }, | |
277 | [TCA_FLOWER_KEY_IP_PROTO] = { .type = NLA_U8 }, | |
278 | [TCA_FLOWER_KEY_IPV4_SRC] = { .type = NLA_U32 }, | |
279 | [TCA_FLOWER_KEY_IPV4_SRC_MASK] = { .type = NLA_U32 }, | |
280 | [TCA_FLOWER_KEY_IPV4_DST] = { .type = NLA_U32 }, | |
281 | [TCA_FLOWER_KEY_IPV4_DST_MASK] = { .type = NLA_U32 }, | |
282 | [TCA_FLOWER_KEY_IPV6_SRC] = { .len = sizeof(struct in6_addr) }, | |
283 | [TCA_FLOWER_KEY_IPV6_SRC_MASK] = { .len = sizeof(struct in6_addr) }, | |
284 | [TCA_FLOWER_KEY_IPV6_DST] = { .len = sizeof(struct in6_addr) }, | |
285 | [TCA_FLOWER_KEY_IPV6_DST_MASK] = { .len = sizeof(struct in6_addr) }, | |
286 | [TCA_FLOWER_KEY_TCP_SRC] = { .type = NLA_U16 }, | |
287 | [TCA_FLOWER_KEY_TCP_DST] = { .type = NLA_U16 }, | |
b175c3a4 JHS |
288 | [TCA_FLOWER_KEY_UDP_SRC] = { .type = NLA_U16 }, |
289 | [TCA_FLOWER_KEY_UDP_DST] = { .type = NLA_U16 }, | |
77b9900e JP |
290 | }; |
291 | ||
292 | static void fl_set_key_val(struct nlattr **tb, | |
293 | void *val, int val_type, | |
294 | void *mask, int mask_type, int len) | |
295 | { | |
296 | if (!tb[val_type]) | |
297 | return; | |
298 | memcpy(val, nla_data(tb[val_type]), len); | |
299 | if (mask_type == TCA_FLOWER_UNSPEC || !tb[mask_type]) | |
300 | memset(mask, 0xff, len); | |
301 | else | |
302 | memcpy(mask, nla_data(tb[mask_type]), len); | |
303 | } | |
304 | ||
305 | static int fl_set_key(struct net *net, struct nlattr **tb, | |
306 | struct fl_flow_key *key, struct fl_flow_key *mask) | |
307 | { | |
dd3aa3b5 | 308 | #ifdef CONFIG_NET_CLS_IND |
77b9900e | 309 | if (tb[TCA_FLOWER_INDEV]) { |
dd3aa3b5 | 310 | int err = tcf_change_indev(net, tb[TCA_FLOWER_INDEV]); |
77b9900e JP |
311 | if (err < 0) |
312 | return err; | |
313 | key->indev_ifindex = err; | |
314 | mask->indev_ifindex = 0xffffffff; | |
315 | } | |
dd3aa3b5 | 316 | #endif |
77b9900e JP |
317 | |
318 | fl_set_key_val(tb, key->eth.dst, TCA_FLOWER_KEY_ETH_DST, | |
319 | mask->eth.dst, TCA_FLOWER_KEY_ETH_DST_MASK, | |
320 | sizeof(key->eth.dst)); | |
321 | fl_set_key_val(tb, key->eth.src, TCA_FLOWER_KEY_ETH_SRC, | |
322 | mask->eth.src, TCA_FLOWER_KEY_ETH_SRC_MASK, | |
323 | sizeof(key->eth.src)); | |
66530bdf | 324 | |
77b9900e JP |
325 | fl_set_key_val(tb, &key->basic.n_proto, TCA_FLOWER_KEY_ETH_TYPE, |
326 | &mask->basic.n_proto, TCA_FLOWER_UNSPEC, | |
327 | sizeof(key->basic.n_proto)); | |
66530bdf | 328 | |
77b9900e JP |
329 | if (key->basic.n_proto == htons(ETH_P_IP) || |
330 | key->basic.n_proto == htons(ETH_P_IPV6)) { | |
331 | fl_set_key_val(tb, &key->basic.ip_proto, TCA_FLOWER_KEY_IP_PROTO, | |
332 | &mask->basic.ip_proto, TCA_FLOWER_UNSPEC, | |
333 | sizeof(key->basic.ip_proto)); | |
334 | } | |
66530bdf JHS |
335 | |
336 | if (tb[TCA_FLOWER_KEY_IPV4_SRC] || tb[TCA_FLOWER_KEY_IPV4_DST]) { | |
337 | key->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
77b9900e JP |
338 | fl_set_key_val(tb, &key->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC, |
339 | &mask->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC_MASK, | |
340 | sizeof(key->ipv4.src)); | |
341 | fl_set_key_val(tb, &key->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST, | |
342 | &mask->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST_MASK, | |
343 | sizeof(key->ipv4.dst)); | |
66530bdf JHS |
344 | } else if (tb[TCA_FLOWER_KEY_IPV6_SRC] || tb[TCA_FLOWER_KEY_IPV6_DST]) { |
345 | key->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
77b9900e JP |
346 | fl_set_key_val(tb, &key->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC, |
347 | &mask->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC_MASK, | |
348 | sizeof(key->ipv6.src)); | |
349 | fl_set_key_val(tb, &key->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST, | |
350 | &mask->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST_MASK, | |
351 | sizeof(key->ipv6.dst)); | |
352 | } | |
66530bdf | 353 | |
77b9900e JP |
354 | if (key->basic.ip_proto == IPPROTO_TCP) { |
355 | fl_set_key_val(tb, &key->tp.src, TCA_FLOWER_KEY_TCP_SRC, | |
356 | &mask->tp.src, TCA_FLOWER_UNSPEC, | |
357 | sizeof(key->tp.src)); | |
358 | fl_set_key_val(tb, &key->tp.dst, TCA_FLOWER_KEY_TCP_DST, | |
359 | &mask->tp.dst, TCA_FLOWER_UNSPEC, | |
360 | sizeof(key->tp.dst)); | |
361 | } else if (key->basic.ip_proto == IPPROTO_UDP) { | |
362 | fl_set_key_val(tb, &key->tp.src, TCA_FLOWER_KEY_UDP_SRC, | |
363 | &mask->tp.src, TCA_FLOWER_UNSPEC, | |
364 | sizeof(key->tp.src)); | |
365 | fl_set_key_val(tb, &key->tp.dst, TCA_FLOWER_KEY_UDP_DST, | |
366 | &mask->tp.dst, TCA_FLOWER_UNSPEC, | |
367 | sizeof(key->tp.dst)); | |
368 | } | |
369 | ||
370 | return 0; | |
371 | } | |
372 | ||
373 | static bool fl_mask_eq(struct fl_flow_mask *mask1, | |
374 | struct fl_flow_mask *mask2) | |
375 | { | |
376 | const long *lmask1 = fl_key_get_start(&mask1->key, mask1); | |
377 | const long *lmask2 = fl_key_get_start(&mask2->key, mask2); | |
378 | ||
379 | return !memcmp(&mask1->range, &mask2->range, sizeof(mask1->range)) && | |
380 | !memcmp(lmask1, lmask2, fl_mask_range(mask1)); | |
381 | } | |
382 | ||
383 | static const struct rhashtable_params fl_ht_params = { | |
384 | .key_offset = offsetof(struct cls_fl_filter, mkey), /* base offset */ | |
385 | .head_offset = offsetof(struct cls_fl_filter, ht_node), | |
386 | .automatic_shrinking = true, | |
387 | }; | |
388 | ||
389 | static int fl_init_hashtable(struct cls_fl_head *head, | |
390 | struct fl_flow_mask *mask) | |
391 | { | |
392 | head->ht_params = fl_ht_params; | |
393 | head->ht_params.key_len = fl_mask_range(mask); | |
394 | head->ht_params.key_offset += mask->range.start; | |
395 | ||
396 | return rhashtable_init(&head->ht, &head->ht_params); | |
397 | } | |
398 | ||
399 | #define FL_KEY_MEMBER_OFFSET(member) offsetof(struct fl_flow_key, member) | |
400 | #define FL_KEY_MEMBER_SIZE(member) (sizeof(((struct fl_flow_key *) 0)->member)) | |
401 | #define FL_KEY_MEMBER_END_OFFSET(member) \ | |
402 | (FL_KEY_MEMBER_OFFSET(member) + FL_KEY_MEMBER_SIZE(member)) | |
403 | ||
404 | #define FL_KEY_IN_RANGE(mask, member) \ | |
405 | (FL_KEY_MEMBER_OFFSET(member) <= (mask)->range.end && \ | |
406 | FL_KEY_MEMBER_END_OFFSET(member) >= (mask)->range.start) | |
407 | ||
408 | #define FL_KEY_SET(keys, cnt, id, member) \ | |
409 | do { \ | |
410 | keys[cnt].key_id = id; \ | |
411 | keys[cnt].offset = FL_KEY_MEMBER_OFFSET(member); \ | |
412 | cnt++; \ | |
413 | } while(0); | |
414 | ||
415 | #define FL_KEY_SET_IF_IN_RANGE(mask, keys, cnt, id, member) \ | |
416 | do { \ | |
417 | if (FL_KEY_IN_RANGE(mask, member)) \ | |
418 | FL_KEY_SET(keys, cnt, id, member); \ | |
419 | } while(0); | |
420 | ||
421 | static void fl_init_dissector(struct cls_fl_head *head, | |
422 | struct fl_flow_mask *mask) | |
423 | { | |
424 | struct flow_dissector_key keys[FLOW_DISSECTOR_KEY_MAX]; | |
425 | size_t cnt = 0; | |
426 | ||
42aecaa9 | 427 | FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_CONTROL, control); |
77b9900e JP |
428 | FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_BASIC, basic); |
429 | FL_KEY_SET_IF_IN_RANGE(mask, keys, cnt, | |
430 | FLOW_DISSECTOR_KEY_ETH_ADDRS, eth); | |
431 | FL_KEY_SET_IF_IN_RANGE(mask, keys, cnt, | |
432 | FLOW_DISSECTOR_KEY_IPV4_ADDRS, ipv4); | |
433 | FL_KEY_SET_IF_IN_RANGE(mask, keys, cnt, | |
434 | FLOW_DISSECTOR_KEY_IPV6_ADDRS, ipv6); | |
435 | FL_KEY_SET_IF_IN_RANGE(mask, keys, cnt, | |
436 | FLOW_DISSECTOR_KEY_PORTS, tp); | |
437 | ||
438 | skb_flow_dissector_init(&head->dissector, keys, cnt); | |
439 | } | |
440 | ||
441 | static int fl_check_assign_mask(struct cls_fl_head *head, | |
442 | struct fl_flow_mask *mask) | |
443 | { | |
444 | int err; | |
445 | ||
446 | if (head->mask_assigned) { | |
447 | if (!fl_mask_eq(&head->mask, mask)) | |
448 | return -EINVAL; | |
449 | else | |
450 | return 0; | |
451 | } | |
452 | ||
453 | /* Mask is not assigned yet. So assign it and init hashtable | |
454 | * according to that. | |
455 | */ | |
456 | err = fl_init_hashtable(head, mask); | |
457 | if (err) | |
458 | return err; | |
459 | memcpy(&head->mask, mask, sizeof(head->mask)); | |
460 | head->mask_assigned = true; | |
461 | ||
462 | fl_init_dissector(head, mask); | |
463 | ||
464 | return 0; | |
465 | } | |
466 | ||
467 | static int fl_set_parms(struct net *net, struct tcf_proto *tp, | |
468 | struct cls_fl_filter *f, struct fl_flow_mask *mask, | |
469 | unsigned long base, struct nlattr **tb, | |
470 | struct nlattr *est, bool ovr) | |
471 | { | |
472 | struct tcf_exts e; | |
473 | int err; | |
474 | ||
475 | tcf_exts_init(&e, TCA_FLOWER_ACT, 0); | |
476 | err = tcf_exts_validate(net, tp, tb, est, &e, ovr); | |
477 | if (err < 0) | |
478 | return err; | |
479 | ||
480 | if (tb[TCA_FLOWER_CLASSID]) { | |
481 | f->res.classid = nla_get_u32(tb[TCA_FLOWER_CLASSID]); | |
482 | tcf_bind_filter(tp, &f->res, base); | |
483 | } | |
484 | ||
485 | err = fl_set_key(net, tb, &f->key, &mask->key); | |
486 | if (err) | |
487 | goto errout; | |
488 | ||
489 | fl_mask_update_range(mask); | |
490 | fl_set_masked_key(&f->mkey, &f->key, mask); | |
491 | ||
492 | tcf_exts_change(tp, &f->exts, &e); | |
493 | ||
494 | return 0; | |
495 | errout: | |
496 | tcf_exts_destroy(&e); | |
497 | return err; | |
498 | } | |
499 | ||
500 | static u32 fl_grab_new_handle(struct tcf_proto *tp, | |
501 | struct cls_fl_head *head) | |
502 | { | |
503 | unsigned int i = 0x80000000; | |
504 | u32 handle; | |
505 | ||
506 | do { | |
507 | if (++head->hgen == 0x7FFFFFFF) | |
508 | head->hgen = 1; | |
509 | } while (--i > 0 && fl_get(tp, head->hgen)); | |
510 | ||
511 | if (unlikely(i == 0)) { | |
512 | pr_err("Insufficient number of handles\n"); | |
513 | handle = 0; | |
514 | } else { | |
515 | handle = head->hgen; | |
516 | } | |
517 | ||
518 | return handle; | |
519 | } | |
520 | ||
521 | static int fl_change(struct net *net, struct sk_buff *in_skb, | |
522 | struct tcf_proto *tp, unsigned long base, | |
523 | u32 handle, struct nlattr **tca, | |
524 | unsigned long *arg, bool ovr) | |
525 | { | |
526 | struct cls_fl_head *head = rtnl_dereference(tp->root); | |
527 | struct cls_fl_filter *fold = (struct cls_fl_filter *) *arg; | |
528 | struct cls_fl_filter *fnew; | |
529 | struct nlattr *tb[TCA_FLOWER_MAX + 1]; | |
530 | struct fl_flow_mask mask = {}; | |
531 | int err; | |
532 | ||
533 | if (!tca[TCA_OPTIONS]) | |
534 | return -EINVAL; | |
535 | ||
536 | err = nla_parse_nested(tb, TCA_FLOWER_MAX, tca[TCA_OPTIONS], fl_policy); | |
537 | if (err < 0) | |
538 | return err; | |
539 | ||
540 | if (fold && handle && fold->handle != handle) | |
541 | return -EINVAL; | |
542 | ||
543 | fnew = kzalloc(sizeof(*fnew), GFP_KERNEL); | |
544 | if (!fnew) | |
545 | return -ENOBUFS; | |
546 | ||
547 | tcf_exts_init(&fnew->exts, TCA_FLOWER_ACT, 0); | |
548 | ||
549 | if (!handle) { | |
550 | handle = fl_grab_new_handle(tp, head); | |
551 | if (!handle) { | |
552 | err = -EINVAL; | |
553 | goto errout; | |
554 | } | |
555 | } | |
556 | fnew->handle = handle; | |
557 | ||
e69985c6 AV |
558 | if (tb[TCA_FLOWER_FLAGS]) { |
559 | fnew->flags = nla_get_u32(tb[TCA_FLOWER_FLAGS]); | |
560 | ||
561 | if (!tc_flags_valid(fnew->flags)) { | |
562 | err = -EINVAL; | |
563 | goto errout; | |
564 | } | |
565 | } | |
5b33f488 | 566 | |
77b9900e JP |
567 | err = fl_set_parms(net, tp, fnew, &mask, base, tb, tca[TCA_RATE], ovr); |
568 | if (err) | |
569 | goto errout; | |
570 | ||
571 | err = fl_check_assign_mask(head, &mask); | |
572 | if (err) | |
573 | goto errout; | |
574 | ||
e69985c6 AV |
575 | if (!(fnew->flags & TCA_CLS_FLAGS_SKIP_SW)) { |
576 | err = rhashtable_insert_fast(&head->ht, &fnew->ht_node, | |
577 | head->ht_params); | |
578 | if (err) | |
579 | goto errout; | |
580 | } | |
5b33f488 AV |
581 | |
582 | fl_hw_replace_filter(tp, | |
583 | &head->dissector, | |
584 | &mask.key, | |
585 | &fnew->key, | |
586 | &fnew->exts, | |
8208d21b | 587 | (unsigned long)fnew, |
e69985c6 | 588 | fnew->flags); |
5b33f488 AV |
589 | |
590 | if (fold) { | |
77b9900e JP |
591 | rhashtable_remove_fast(&head->ht, &fold->ht_node, |
592 | head->ht_params); | |
8208d21b | 593 | fl_hw_destroy_filter(tp, (unsigned long)fold); |
5b33f488 | 594 | } |
77b9900e JP |
595 | |
596 | *arg = (unsigned long) fnew; | |
597 | ||
598 | if (fold) { | |
ff3532f2 | 599 | list_replace_rcu(&fold->list, &fnew->list); |
77b9900e JP |
600 | tcf_unbind_filter(tp, &fold->res); |
601 | call_rcu(&fold->rcu, fl_destroy_filter); | |
602 | } else { | |
603 | list_add_tail_rcu(&fnew->list, &head->filters); | |
604 | } | |
605 | ||
606 | return 0; | |
607 | ||
608 | errout: | |
609 | kfree(fnew); | |
610 | return err; | |
611 | } | |
612 | ||
613 | static int fl_delete(struct tcf_proto *tp, unsigned long arg) | |
614 | { | |
615 | struct cls_fl_head *head = rtnl_dereference(tp->root); | |
616 | struct cls_fl_filter *f = (struct cls_fl_filter *) arg; | |
617 | ||
618 | rhashtable_remove_fast(&head->ht, &f->ht_node, | |
619 | head->ht_params); | |
620 | list_del_rcu(&f->list); | |
8208d21b | 621 | fl_hw_destroy_filter(tp, (unsigned long)f); |
77b9900e JP |
622 | tcf_unbind_filter(tp, &f->res); |
623 | call_rcu(&f->rcu, fl_destroy_filter); | |
624 | return 0; | |
625 | } | |
626 | ||
627 | static void fl_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
628 | { | |
629 | struct cls_fl_head *head = rtnl_dereference(tp->root); | |
630 | struct cls_fl_filter *f; | |
631 | ||
632 | list_for_each_entry_rcu(f, &head->filters, list) { | |
633 | if (arg->count < arg->skip) | |
634 | goto skip; | |
635 | if (arg->fn(tp, (unsigned long) f, arg) < 0) { | |
636 | arg->stop = 1; | |
637 | break; | |
638 | } | |
639 | skip: | |
640 | arg->count++; | |
641 | } | |
642 | } | |
643 | ||
644 | static int fl_dump_key_val(struct sk_buff *skb, | |
645 | void *val, int val_type, | |
646 | void *mask, int mask_type, int len) | |
647 | { | |
648 | int err; | |
649 | ||
650 | if (!memchr_inv(mask, 0, len)) | |
651 | return 0; | |
652 | err = nla_put(skb, val_type, len, val); | |
653 | if (err) | |
654 | return err; | |
655 | if (mask_type != TCA_FLOWER_UNSPEC) { | |
656 | err = nla_put(skb, mask_type, len, mask); | |
657 | if (err) | |
658 | return err; | |
659 | } | |
660 | return 0; | |
661 | } | |
662 | ||
663 | static int fl_dump(struct net *net, struct tcf_proto *tp, unsigned long fh, | |
664 | struct sk_buff *skb, struct tcmsg *t) | |
665 | { | |
666 | struct cls_fl_head *head = rtnl_dereference(tp->root); | |
667 | struct cls_fl_filter *f = (struct cls_fl_filter *) fh; | |
668 | struct nlattr *nest; | |
669 | struct fl_flow_key *key, *mask; | |
670 | ||
671 | if (!f) | |
672 | return skb->len; | |
673 | ||
674 | t->tcm_handle = f->handle; | |
675 | ||
676 | nest = nla_nest_start(skb, TCA_OPTIONS); | |
677 | if (!nest) | |
678 | goto nla_put_failure; | |
679 | ||
680 | if (f->res.classid && | |
681 | nla_put_u32(skb, TCA_FLOWER_CLASSID, f->res.classid)) | |
682 | goto nla_put_failure; | |
683 | ||
684 | key = &f->key; | |
685 | mask = &head->mask.key; | |
686 | ||
687 | if (mask->indev_ifindex) { | |
688 | struct net_device *dev; | |
689 | ||
690 | dev = __dev_get_by_index(net, key->indev_ifindex); | |
691 | if (dev && nla_put_string(skb, TCA_FLOWER_INDEV, dev->name)) | |
692 | goto nla_put_failure; | |
693 | } | |
694 | ||
10cbc684 AV |
695 | fl_hw_update_stats(tp, f); |
696 | ||
77b9900e JP |
697 | if (fl_dump_key_val(skb, key->eth.dst, TCA_FLOWER_KEY_ETH_DST, |
698 | mask->eth.dst, TCA_FLOWER_KEY_ETH_DST_MASK, | |
699 | sizeof(key->eth.dst)) || | |
700 | fl_dump_key_val(skb, key->eth.src, TCA_FLOWER_KEY_ETH_SRC, | |
701 | mask->eth.src, TCA_FLOWER_KEY_ETH_SRC_MASK, | |
702 | sizeof(key->eth.src)) || | |
703 | fl_dump_key_val(skb, &key->basic.n_proto, TCA_FLOWER_KEY_ETH_TYPE, | |
704 | &mask->basic.n_proto, TCA_FLOWER_UNSPEC, | |
705 | sizeof(key->basic.n_proto))) | |
706 | goto nla_put_failure; | |
707 | if ((key->basic.n_proto == htons(ETH_P_IP) || | |
708 | key->basic.n_proto == htons(ETH_P_IPV6)) && | |
709 | fl_dump_key_val(skb, &key->basic.ip_proto, TCA_FLOWER_KEY_IP_PROTO, | |
710 | &mask->basic.ip_proto, TCA_FLOWER_UNSPEC, | |
711 | sizeof(key->basic.ip_proto))) | |
712 | goto nla_put_failure; | |
713 | ||
c3f83241 | 714 | if (key->control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS && |
77b9900e JP |
715 | (fl_dump_key_val(skb, &key->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC, |
716 | &mask->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC_MASK, | |
717 | sizeof(key->ipv4.src)) || | |
718 | fl_dump_key_val(skb, &key->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST, | |
719 | &mask->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST_MASK, | |
720 | sizeof(key->ipv4.dst)))) | |
721 | goto nla_put_failure; | |
c3f83241 | 722 | else if (key->control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS && |
77b9900e JP |
723 | (fl_dump_key_val(skb, &key->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC, |
724 | &mask->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC_MASK, | |
725 | sizeof(key->ipv6.src)) || | |
726 | fl_dump_key_val(skb, &key->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST, | |
727 | &mask->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST_MASK, | |
728 | sizeof(key->ipv6.dst)))) | |
729 | goto nla_put_failure; | |
730 | ||
731 | if (key->basic.ip_proto == IPPROTO_TCP && | |
732 | (fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_TCP_SRC, | |
733 | &mask->tp.src, TCA_FLOWER_UNSPEC, | |
734 | sizeof(key->tp.src)) || | |
735 | fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_TCP_DST, | |
736 | &mask->tp.dst, TCA_FLOWER_UNSPEC, | |
737 | sizeof(key->tp.dst)))) | |
738 | goto nla_put_failure; | |
739 | else if (key->basic.ip_proto == IPPROTO_UDP && | |
740 | (fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_UDP_SRC, | |
741 | &mask->tp.src, TCA_FLOWER_UNSPEC, | |
742 | sizeof(key->tp.src)) || | |
743 | fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_UDP_DST, | |
744 | &mask->tp.dst, TCA_FLOWER_UNSPEC, | |
745 | sizeof(key->tp.dst)))) | |
746 | goto nla_put_failure; | |
747 | ||
e69985c6 AV |
748 | nla_put_u32(skb, TCA_FLOWER_FLAGS, f->flags); |
749 | ||
77b9900e JP |
750 | if (tcf_exts_dump(skb, &f->exts)) |
751 | goto nla_put_failure; | |
752 | ||
753 | nla_nest_end(skb, nest); | |
754 | ||
755 | if (tcf_exts_dump_stats(skb, &f->exts) < 0) | |
756 | goto nla_put_failure; | |
757 | ||
758 | return skb->len; | |
759 | ||
760 | nla_put_failure: | |
761 | nla_nest_cancel(skb, nest); | |
762 | return -1; | |
763 | } | |
764 | ||
765 | static struct tcf_proto_ops cls_fl_ops __read_mostly = { | |
766 | .kind = "flower", | |
767 | .classify = fl_classify, | |
768 | .init = fl_init, | |
769 | .destroy = fl_destroy, | |
770 | .get = fl_get, | |
771 | .change = fl_change, | |
772 | .delete = fl_delete, | |
773 | .walk = fl_walk, | |
774 | .dump = fl_dump, | |
775 | .owner = THIS_MODULE, | |
776 | }; | |
777 | ||
778 | static int __init cls_fl_init(void) | |
779 | { | |
780 | return register_tcf_proto_ops(&cls_fl_ops); | |
781 | } | |
782 | ||
783 | static void __exit cls_fl_exit(void) | |
784 | { | |
785 | unregister_tcf_proto_ops(&cls_fl_ops); | |
786 | } | |
787 | ||
788 | module_init(cls_fl_init); | |
789 | module_exit(cls_fl_exit); | |
790 | ||
791 | MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>"); | |
792 | MODULE_DESCRIPTION("Flower classifier"); | |
793 | MODULE_LICENSE("GPL v2"); |