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net_sched: fix use of uninitialized ethertype variable in cls_flower
[deliverable/linux.git] / net / sched / cls_flower.c
CommitLineData
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
26struct 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;
9399ae9a 31 struct flow_dissector_key_vlan vlan;
c3f83241 32 struct flow_dissector_key_addrs ipaddrs;
77b9900e 33 union {
c3f83241 34 struct flow_dissector_key_ipv4_addrs ipv4;
77b9900e
JP		 35 struct flow_dissector_key_ipv6_addrs ipv6;
36 };
37 struct flow_dissector_key_ports tp;
38} __aligned(BITS_PER_LONG / 8); /* Ensure that we can do comparisons as longs. */
39
40struct fl_flow_mask_range {
41 unsigned short int start;
42 unsigned short int end;
43};
44
45struct fl_flow_mask {
46 struct fl_flow_key key;
47 struct fl_flow_mask_range range;
48 struct rcu_head rcu;
49};
50
51struct cls_fl_head {
52 struct rhashtable ht;
53 struct fl_flow_mask mask;
54 struct flow_dissector dissector;
55 u32 hgen;
56 bool mask_assigned;
57 struct list_head filters;
58 struct rhashtable_params ht_params;
59 struct rcu_head rcu;
60};
61
62struct cls_fl_filter {
63 struct rhash_head ht_node;
64 struct fl_flow_key mkey;
65 struct tcf_exts exts;
66 struct tcf_result res;
67 struct fl_flow_key key;
68 struct list_head list;
69 u32 handle;
e69985c6 70 u32 flags;
77b9900e
JP		 71 struct rcu_head rcu;
72};
73
74static unsigned short int fl_mask_range(const struct fl_flow_mask *mask)
75{
76 return mask->range.end - mask->range.start;
77}
78
79static void fl_mask_update_range(struct fl_flow_mask *mask)
80{
81 const u8 *bytes = (const u8 *) &mask->key;
82 size_t size = sizeof(mask->key);
83 size_t i, first = 0, last = size - 1;
84
85 for (i = 0; i < sizeof(mask->key); i++) {
86 if (bytes[i]) {
87 if (!first && i)
88 first = i;
89 last = i;
90 }
91 }
92 mask->range.start = rounddown(first, sizeof(long));
93 mask->range.end = roundup(last + 1, sizeof(long));
94}
95
96static void *fl_key_get_start(struct fl_flow_key *key,
97 const struct fl_flow_mask *mask)
98{
99 return (u8 *) key + mask->range.start;
100}
101
102static void fl_set_masked_key(struct fl_flow_key *mkey, struct fl_flow_key *key,
103 struct fl_flow_mask *mask)
104{
105 const long *lkey = fl_key_get_start(key, mask);
106 const long *lmask = fl_key_get_start(&mask->key, mask);
107 long *lmkey = fl_key_get_start(mkey, mask);
108 int i;
109
110 for (i = 0; i < fl_mask_range(mask); i += sizeof(long))
111 *lmkey++ = *lkey++ & *lmask++;
112}
113
114static void fl_clear_masked_range(struct fl_flow_key *key,
115 struct fl_flow_mask *mask)
116{
117 memset(fl_key_get_start(key, mask), 0, fl_mask_range(mask));
118}
119
120static int fl_classify(struct sk_buff *skb, const struct tcf_proto *tp,
121 struct tcf_result *res)
122{
123 struct cls_fl_head *head = rcu_dereference_bh(tp->root);
124 struct cls_fl_filter *f;
125 struct fl_flow_key skb_key;
126 struct fl_flow_key skb_mkey;
127
e69985c6
AV		 128 if (!atomic_read(&head->ht.nelems))
129 return -1;
130
77b9900e
JP		 131 fl_clear_masked_range(&skb_key, &head->mask);
132 skb_key.indev_ifindex = skb->skb_iif;
133 /* skb_flow_dissect() does not set n_proto in case an unknown protocol,
134 * so do it rather here.
135 */
136 skb_key.basic.n_proto = skb->protocol;
cd79a238 137 skb_flow_dissect(skb, &head->dissector, &skb_key, 0);
77b9900e
JP		 138
139 fl_set_masked_key(&skb_mkey, &skb_key, &head->mask);
140
141 f = rhashtable_lookup_fast(&head->ht,
142 fl_key_get_start(&skb_mkey, &head->mask),
143 head->ht_params);
e8eb36cd 144 if (f && !tc_skip_sw(f->flags)) {
77b9900e
JP		 145 *res = f->res;
146 return tcf_exts_exec(skb, &f->exts, res);
147 }
148 return -1;
149}
150
151static int fl_init(struct tcf_proto *tp)
152{
153 struct cls_fl_head *head;
154
155 head = kzalloc(sizeof(*head), GFP_KERNEL);
156 if (!head)
157 return -ENOBUFS;
158
159 INIT_LIST_HEAD_RCU(&head->filters);
160 rcu_assign_pointer(tp->root, head);
161
162 return 0;
163}
164
165static void fl_destroy_filter(struct rcu_head *head)
166{
167 struct cls_fl_filter *f = container_of(head, struct cls_fl_filter, rcu);
168
169 tcf_exts_destroy(&f->exts);
170 kfree(f);
171}
172
8208d21b 173static void fl_hw_destroy_filter(struct tcf_proto *tp, unsigned long cookie)
5b33f488
AV		 174{
175 struct net_device *dev = tp->q->dev_queue->dev;
176 struct tc_cls_flower_offload offload = {0};
177 struct tc_to_netdev tc;
178
92c075db 179 if (!tc_should_offload(dev, tp, 0))
5b33f488
AV		 180 return;
181
182 offload.command = TC_CLSFLOWER_DESTROY;
183 offload.cookie = cookie;
184
185 tc.type = TC_SETUP_CLSFLOWER;
186 tc.cls_flower = &offload;
187
188 dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol, &tc);
189}
190
e8eb36cd
AV		 191static int fl_hw_replace_filter(struct tcf_proto *tp,
192 struct flow_dissector *dissector,
193 struct fl_flow_key *mask,
194 struct fl_flow_key *key,
195 struct tcf_exts *actions,
196 unsigned long cookie, u32 flags)
5b33f488
AV		 197{
198 struct net_device *dev = tp->q->dev_queue->dev;
199 struct tc_cls_flower_offload offload = {0};
200 struct tc_to_netdev tc;
e8eb36cd 201 int err;
5b33f488 202
92c075db 203 if (!tc_should_offload(dev, tp, flags))
e8eb36cd 204 return tc_skip_sw(flags) ? -EINVAL : 0;
5b33f488
AV		 205
206 offload.command = TC_CLSFLOWER_REPLACE;
207 offload.cookie = cookie;
208 offload.dissector = dissector;
209 offload.mask = mask;
210 offload.key = key;
211 offload.exts = actions;
212
213 tc.type = TC_SETUP_CLSFLOWER;
214 tc.cls_flower = &offload;
215
e8eb36cd
AV		 216 err = dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol, &tc);
217
218 if (tc_skip_sw(flags))
219 return err;
220
221 return 0;
5b33f488
AV		 222}
223
10cbc684
AV		 224static void fl_hw_update_stats(struct tcf_proto *tp, struct cls_fl_filter *f)
225{
226 struct net_device *dev = tp->q->dev_queue->dev;
227 struct tc_cls_flower_offload offload = {0};
228 struct tc_to_netdev tc;
229
92c075db 230 if (!tc_should_offload(dev, tp, 0))
10cbc684
AV		 231 return;
232
233 offload.command = TC_CLSFLOWER_STATS;
234 offload.cookie = (unsigned long)f;
235 offload.exts = &f->exts;
236
237 tc.type = TC_SETUP_CLSFLOWER;
238 tc.cls_flower = &offload;
239
240 dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle, tp->protocol, &tc);
241}
242
77b9900e
JP		 243static bool fl_destroy(struct tcf_proto *tp, bool force)
244{
245 struct cls_fl_head *head = rtnl_dereference(tp->root);
246 struct cls_fl_filter *f, *next;
247
248 if (!force && !list_empty(&head->filters))
249 return false;
250
251 list_for_each_entry_safe(f, next, &head->filters, list) {
8208d21b 252 fl_hw_destroy_filter(tp, (unsigned long)f);
77b9900e
JP		 253 list_del_rcu(&f->list);
254 call_rcu(&f->rcu, fl_destroy_filter);
255 }
256 RCU_INIT_POINTER(tp->root, NULL);
257 if (head->mask_assigned)
258 rhashtable_destroy(&head->ht);
259 kfree_rcu(head, rcu);
260 return true;
261}
262
263static unsigned long fl_get(struct tcf_proto *tp, u32 handle)
264{
265 struct cls_fl_head *head = rtnl_dereference(tp->root);
266 struct cls_fl_filter *f;
267
268 list_for_each_entry(f, &head->filters, list)
269 if (f->handle == handle)
270 return (unsigned long) f;
271 return 0;
272}
273
274static const struct nla_policy fl_policy[TCA_FLOWER_MAX + 1] = {
275 [TCA_FLOWER_UNSPEC] = { .type = NLA_UNSPEC },
276 [TCA_FLOWER_CLASSID] = { .type = NLA_U32 },
277 [TCA_FLOWER_INDEV] = { .type = NLA_STRING,
278 .len = IFNAMSIZ },
279 [TCA_FLOWER_KEY_ETH_DST] = { .len = ETH_ALEN },
280 [TCA_FLOWER_KEY_ETH_DST_MASK] = { .len = ETH_ALEN },
281 [TCA_FLOWER_KEY_ETH_SRC] = { .len = ETH_ALEN },
282 [TCA_FLOWER_KEY_ETH_SRC_MASK] = { .len = ETH_ALEN },
283 [TCA_FLOWER_KEY_ETH_TYPE] = { .type = NLA_U16 },
284 [TCA_FLOWER_KEY_IP_PROTO] = { .type = NLA_U8 },
285 [TCA_FLOWER_KEY_IPV4_SRC] = { .type = NLA_U32 },
286 [TCA_FLOWER_KEY_IPV4_SRC_MASK] = { .type = NLA_U32 },
287 [TCA_FLOWER_KEY_IPV4_DST] = { .type = NLA_U32 },
288 [TCA_FLOWER_KEY_IPV4_DST_MASK] = { .type = NLA_U32 },
289 [TCA_FLOWER_KEY_IPV6_SRC] = { .len = sizeof(struct in6_addr) },
290 [TCA_FLOWER_KEY_IPV6_SRC_MASK] = { .len = sizeof(struct in6_addr) },
291 [TCA_FLOWER_KEY_IPV6_DST] = { .len = sizeof(struct in6_addr) },
292 [TCA_FLOWER_KEY_IPV6_DST_MASK] = { .len = sizeof(struct in6_addr) },
293 [TCA_FLOWER_KEY_TCP_SRC] = { .type = NLA_U16 },
294 [TCA_FLOWER_KEY_TCP_DST] = { .type = NLA_U16 },
b175c3a4
JHS		 295 [TCA_FLOWER_KEY_UDP_SRC] = { .type = NLA_U16 },
296 [TCA_FLOWER_KEY_UDP_DST] = { .type = NLA_U16 },
9399ae9a
HHZ		 297 [TCA_FLOWER_KEY_VLAN_ID] = { .type = NLA_U16 },
298 [TCA_FLOWER_KEY_VLAN_PRIO] = { .type = NLA_U8 },
299 [TCA_FLOWER_KEY_VLAN_ETH_TYPE] = { .type = NLA_U16 },
300
77b9900e
JP		 301};
302
303static void fl_set_key_val(struct nlattr **tb,
304 void *val, int val_type,
305 void *mask, int mask_type, int len)
306{
307 if (!tb[val_type])
308 return;
309 memcpy(val, nla_data(tb[val_type]), len);
310 if (mask_type == TCA_FLOWER_UNSPEC || !tb[mask_type])
311 memset(mask, 0xff, len);
312 else
313 memcpy(mask, nla_data(tb[mask_type]), len);
314}
315
9399ae9a
HHZ		 316static void fl_set_key_vlan(struct nlattr **tb,
317 struct flow_dissector_key_vlan *key_val,
318 struct flow_dissector_key_vlan *key_mask)
319{
320#define VLAN_PRIORITY_MASK 0x7
321
322 if (tb[TCA_FLOWER_KEY_VLAN_ID]) {
323 key_val->vlan_id =
324 nla_get_u16(tb[TCA_FLOWER_KEY_VLAN_ID]) & VLAN_VID_MASK;
325 key_mask->vlan_id = VLAN_VID_MASK;
326 }
327 if (tb[TCA_FLOWER_KEY_VLAN_PRIO]) {
328 key_val->vlan_priority =
329 nla_get_u8(tb[TCA_FLOWER_KEY_VLAN_PRIO]) &
330 VLAN_PRIORITY_MASK;
331 key_mask->vlan_priority = VLAN_PRIORITY_MASK;
332 }
333}
334
77b9900e
JP		 335static int fl_set_key(struct net *net, struct nlattr **tb,
336 struct fl_flow_key *key, struct fl_flow_key *mask)
337{
9399ae9a 338 __be16 ethertype;
dd3aa3b5 339#ifdef CONFIG_NET_CLS_IND
77b9900e 340 if (tb[TCA_FLOWER_INDEV]) {
dd3aa3b5 341 int err = tcf_change_indev(net, tb[TCA_FLOWER_INDEV]);
77b9900e
JP		 342 if (err < 0)
343 return err;
344 key->indev_ifindex = err;
345 mask->indev_ifindex = 0xffffffff;
346 }
dd3aa3b5 347#endif
77b9900e
JP		 348
349 fl_set_key_val(tb, key->eth.dst, TCA_FLOWER_KEY_ETH_DST,
350 mask->eth.dst, TCA_FLOWER_KEY_ETH_DST_MASK,
351 sizeof(key->eth.dst));
352 fl_set_key_val(tb, key->eth.src, TCA_FLOWER_KEY_ETH_SRC,
353 mask->eth.src, TCA_FLOWER_KEY_ETH_SRC_MASK,
354 sizeof(key->eth.src));
66530bdf 355
0b498a52 356 if (tb[TCA_FLOWER_KEY_ETH_TYPE]) {
9399ae9a
HHZ		 357 ethertype = nla_get_be16(tb[TCA_FLOWER_KEY_ETH_TYPE]);
358
0b498a52
AB		 359 if (ethertype == htons(ETH_P_8021Q)) {
360 fl_set_key_vlan(tb, &key->vlan, &mask->vlan);
361 fl_set_key_val(tb, &key->basic.n_proto,
362 TCA_FLOWER_KEY_VLAN_ETH_TYPE,
363 &mask->basic.n_proto, TCA_FLOWER_UNSPEC,
364 sizeof(key->basic.n_proto));
365 } else {
366 key->basic.n_proto = ethertype;
367 mask->basic.n_proto = cpu_to_be16(~0);
368 }
9399ae9a 369 }
66530bdf 370
77b9900e
JP		 371 if (key->basic.n_proto == htons(ETH_P_IP) ||
372 key->basic.n_proto == htons(ETH_P_IPV6)) {
373 fl_set_key_val(tb, &key->basic.ip_proto, TCA_FLOWER_KEY_IP_PROTO,
374 &mask->basic.ip_proto, TCA_FLOWER_UNSPEC,
375 sizeof(key->basic.ip_proto));
376 }
66530bdf
JHS		 377
378 if (tb[TCA_FLOWER_KEY_IPV4_SRC] || tb[TCA_FLOWER_KEY_IPV4_DST]) {
379 key->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
77b9900e
JP		 380 fl_set_key_val(tb, &key->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC,
381 &mask->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC_MASK,
382 sizeof(key->ipv4.src));
383 fl_set_key_val(tb, &key->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST,
384 &mask->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST_MASK,
385 sizeof(key->ipv4.dst));
66530bdf
JHS		 386 } else if (tb[TCA_FLOWER_KEY_IPV6_SRC] || tb[TCA_FLOWER_KEY_IPV6_DST]) {
387 key->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
77b9900e
JP		 388 fl_set_key_val(tb, &key->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC,
389 &mask->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC_MASK,
390 sizeof(key->ipv6.src));
391 fl_set_key_val(tb, &key->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST,
392 &mask->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST_MASK,
393 sizeof(key->ipv6.dst));
394 }
66530bdf 395
77b9900e
JP		 396 if (key->basic.ip_proto == IPPROTO_TCP) {
397 fl_set_key_val(tb, &key->tp.src, TCA_FLOWER_KEY_TCP_SRC,
398 &mask->tp.src, TCA_FLOWER_UNSPEC,
399 sizeof(key->tp.src));
400 fl_set_key_val(tb, &key->tp.dst, TCA_FLOWER_KEY_TCP_DST,
401 &mask->tp.dst, TCA_FLOWER_UNSPEC,
402 sizeof(key->tp.dst));
403 } else if (key->basic.ip_proto == IPPROTO_UDP) {
404 fl_set_key_val(tb, &key->tp.src, TCA_FLOWER_KEY_UDP_SRC,
405 &mask->tp.src, TCA_FLOWER_UNSPEC,
406 sizeof(key->tp.src));
407 fl_set_key_val(tb, &key->tp.dst, TCA_FLOWER_KEY_UDP_DST,
408 &mask->tp.dst, TCA_FLOWER_UNSPEC,
409 sizeof(key->tp.dst));
410 }
411
412 return 0;
413}
414
415static bool fl_mask_eq(struct fl_flow_mask *mask1,
416 struct fl_flow_mask *mask2)
417{
418 const long *lmask1 = fl_key_get_start(&mask1->key, mask1);
419 const long *lmask2 = fl_key_get_start(&mask2->key, mask2);
420
421 return !memcmp(&mask1->range, &mask2->range, sizeof(mask1->range)) &&
422 !memcmp(lmask1, lmask2, fl_mask_range(mask1));
423}
424
425static const struct rhashtable_params fl_ht_params = {
426 .key_offset = offsetof(struct cls_fl_filter, mkey), /* base offset */
427 .head_offset = offsetof(struct cls_fl_filter, ht_node),
428 .automatic_shrinking = true,
429};
430
431static int fl_init_hashtable(struct cls_fl_head *head,
432 struct fl_flow_mask *mask)
433{
434 head->ht_params = fl_ht_params;
435 head->ht_params.key_len = fl_mask_range(mask);
436 head->ht_params.key_offset += mask->range.start;
437
438 return rhashtable_init(&head->ht, &head->ht_params);
439}
440
441#define FL_KEY_MEMBER_OFFSET(member) offsetof(struct fl_flow_key, member)
442#define FL_KEY_MEMBER_SIZE(member) (sizeof(((struct fl_flow_key *) 0)->member))
77b9900e 443
339ba878
HHZ		 444#define FL_KEY_IS_MASKED(mask, member) \
445 memchr_inv(((char *)mask) + FL_KEY_MEMBER_OFFSET(member), \
446 0, FL_KEY_MEMBER_SIZE(member)) \
77b9900e
JP		 447
448#define FL_KEY_SET(keys, cnt, id, member) \
449 do { \
450 keys[cnt].key_id = id; \
451 keys[cnt].offset = FL_KEY_MEMBER_OFFSET(member); \
452 cnt++; \
453 } while(0);
454
339ba878 455#define FL_KEY_SET_IF_MASKED(mask, keys, cnt, id, member) \
77b9900e 456 do { \
339ba878 457 if (FL_KEY_IS_MASKED(mask, member)) \
77b9900e
JP		 458 FL_KEY_SET(keys, cnt, id, member); \
459 } while(0);
460
461static void fl_init_dissector(struct cls_fl_head *head,
462 struct fl_flow_mask *mask)
463{
464 struct flow_dissector_key keys[FLOW_DISSECTOR_KEY_MAX];
465 size_t cnt = 0;
466
42aecaa9 467 FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_CONTROL, control);
77b9900e 468 FL_KEY_SET(keys, cnt, FLOW_DISSECTOR_KEY_BASIC, basic);
339ba878
HHZ		 469 FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
470 FLOW_DISSECTOR_KEY_ETH_ADDRS, eth);
471 FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
472 FLOW_DISSECTOR_KEY_IPV4_ADDRS, ipv4);
473 FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
474 FLOW_DISSECTOR_KEY_IPV6_ADDRS, ipv6);
475 FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
476 FLOW_DISSECTOR_KEY_PORTS, tp);
9399ae9a
HHZ		 477 FL_KEY_SET_IF_MASKED(&mask->key, keys, cnt,
478 FLOW_DISSECTOR_KEY_VLAN, vlan);
77b9900e
JP		 479
480 skb_flow_dissector_init(&head->dissector, keys, cnt);
481}
482
483static int fl_check_assign_mask(struct cls_fl_head *head,
484 struct fl_flow_mask *mask)
485{
486 int err;
487
488 if (head->mask_assigned) {
489 if (!fl_mask_eq(&head->mask, mask))
490 return -EINVAL;
491 else
492 return 0;
493 }
494
495 /* Mask is not assigned yet. So assign it and init hashtable
496 * according to that.
497 */
498 err = fl_init_hashtable(head, mask);
499 if (err)
500 return err;
501 memcpy(&head->mask, mask, sizeof(head->mask));
502 head->mask_assigned = true;
503
504 fl_init_dissector(head, mask);
505
506 return 0;
507}
508
509static int fl_set_parms(struct net *net, struct tcf_proto *tp,
510 struct cls_fl_filter *f, struct fl_flow_mask *mask,
511 unsigned long base, struct nlattr **tb,
512 struct nlattr *est, bool ovr)
513{
514 struct tcf_exts e;
515 int err;
516
b9a24bb7 517 err = tcf_exts_init(&e, TCA_FLOWER_ACT, 0);
77b9900e
JP		 518 if (err < 0)
519 return err;
b9a24bb7
WC		 520 err = tcf_exts_validate(net, tp, tb, est, &e, ovr);
521 if (err < 0)
522 goto errout;
77b9900e
JP		 523
524 if (tb[TCA_FLOWER_CLASSID]) {
525 f->res.classid = nla_get_u32(tb[TCA_FLOWER_CLASSID]);
526 tcf_bind_filter(tp, &f->res, base);
527 }
528
529 err = fl_set_key(net, tb, &f->key, &mask->key);
530 if (err)
531 goto errout;
532
533 fl_mask_update_range(mask);
534 fl_set_masked_key(&f->mkey, &f->key, mask);
535
536 tcf_exts_change(tp, &f->exts, &e);
537
538 return 0;
539errout:
540 tcf_exts_destroy(&e);
541 return err;
542}
543
544static u32 fl_grab_new_handle(struct tcf_proto *tp,
545 struct cls_fl_head *head)
546{
547 unsigned int i = 0x80000000;
548 u32 handle;
549
550 do {
551 if (++head->hgen == 0x7FFFFFFF)
552 head->hgen = 1;
553 } while (--i > 0 && fl_get(tp, head->hgen));
554
555 if (unlikely(i == 0)) {
556 pr_err("Insufficient number of handles\n");
557 handle = 0;
558 } else {
559 handle = head->hgen;
560 }
561
562 return handle;
563}
564
565static int fl_change(struct net *net, struct sk_buff *in_skb,
566 struct tcf_proto *tp, unsigned long base,
567 u32 handle, struct nlattr **tca,
568 unsigned long *arg, bool ovr)
569{
570 struct cls_fl_head *head = rtnl_dereference(tp->root);
571 struct cls_fl_filter *fold = (struct cls_fl_filter *) *arg;
572 struct cls_fl_filter *fnew;
573 struct nlattr *tb[TCA_FLOWER_MAX + 1];
574 struct fl_flow_mask mask = {};
575 int err;
576
577 if (!tca[TCA_OPTIONS])
578 return -EINVAL;
579
580 err = nla_parse_nested(tb, TCA_FLOWER_MAX, tca[TCA_OPTIONS], fl_policy);
581 if (err < 0)
582 return err;
583
584 if (fold && handle && fold->handle != handle)
585 return -EINVAL;
586
587 fnew = kzalloc(sizeof(*fnew), GFP_KERNEL);
588 if (!fnew)
589 return -ENOBUFS;
590
b9a24bb7
WC		 591 err = tcf_exts_init(&fnew->exts, TCA_FLOWER_ACT, 0);
592 if (err < 0)
593 goto errout;
77b9900e
JP		 594
595 if (!handle) {
596 handle = fl_grab_new_handle(tp, head);
597 if (!handle) {
598 err = -EINVAL;
599 goto errout;
600 }
601 }
602 fnew->handle = handle;
603
e69985c6
AV		 604 if (tb[TCA_FLOWER_FLAGS]) {
605 fnew->flags = nla_get_u32(tb[TCA_FLOWER_FLAGS]);
606
607 if (!tc_flags_valid(fnew->flags)) {
608 err = -EINVAL;
609 goto errout;
610 }
611 }
5b33f488 612
77b9900e
JP		 613 err = fl_set_parms(net, tp, fnew, &mask, base, tb, tca[TCA_RATE], ovr);
614 if (err)
615 goto errout;
616
617 err = fl_check_assign_mask(head, &mask);
618 if (err)
619 goto errout;
620
e8eb36cd 621 if (!tc_skip_sw(fnew->flags)) {
e69985c6
AV		 622 err = rhashtable_insert_fast(&head->ht, &fnew->ht_node,
623 head->ht_params);
624 if (err)
625 goto errout;
626 }
5b33f488 627
e8eb36cd
AV		 628 err = fl_hw_replace_filter(tp,
629 &head->dissector,
630 &mask.key,
631 &fnew->key,
632 &fnew->exts,
633 (unsigned long)fnew,
634 fnew->flags);
635 if (err)
636 goto errout;
5b33f488
AV		 637
638 if (fold) {
77b9900e
JP		 639 rhashtable_remove_fast(&head->ht, &fold->ht_node,
640 head->ht_params);
8208d21b 641 fl_hw_destroy_filter(tp, (unsigned long)fold);
5b33f488 642 }
77b9900e
JP		 643
644 *arg = (unsigned long) fnew;
645
646 if (fold) {
ff3532f2 647 list_replace_rcu(&fold->list, &fnew->list);
77b9900e
JP		 648 tcf_unbind_filter(tp, &fold->res);
649 call_rcu(&fold->rcu, fl_destroy_filter);
650 } else {
651 list_add_tail_rcu(&fnew->list, &head->filters);
652 }
653
654 return 0;
655
656errout:
b9a24bb7 657 tcf_exts_destroy(&fnew->exts);
77b9900e
JP		 658 kfree(fnew);
659 return err;
660}
661
662static int fl_delete(struct tcf_proto *tp, unsigned long arg)
663{
664 struct cls_fl_head *head = rtnl_dereference(tp->root);
665 struct cls_fl_filter *f = (struct cls_fl_filter *) arg;
666
667 rhashtable_remove_fast(&head->ht, &f->ht_node,
668 head->ht_params);
669 list_del_rcu(&f->list);
8208d21b 670 fl_hw_destroy_filter(tp, (unsigned long)f);
77b9900e
JP		 671 tcf_unbind_filter(tp, &f->res);
672 call_rcu(&f->rcu, fl_destroy_filter);
673 return 0;
674}
675
676static void fl_walk(struct tcf_proto *tp, struct tcf_walker *arg)
677{
678 struct cls_fl_head *head = rtnl_dereference(tp->root);
679 struct cls_fl_filter *f;
680
681 list_for_each_entry_rcu(f, &head->filters, list) {
682 if (arg->count < arg->skip)
683 goto skip;
684 if (arg->fn(tp, (unsigned long) f, arg) < 0) {
685 arg->stop = 1;
686 break;
687 }
688skip:
689 arg->count++;
690 }
691}
692
693static int fl_dump_key_val(struct sk_buff *skb,
694 void *val, int val_type,
695 void *mask, int mask_type, int len)
696{
697 int err;
698
699 if (!memchr_inv(mask, 0, len))
700 return 0;
701 err = nla_put(skb, val_type, len, val);
702 if (err)
703 return err;
704 if (mask_type != TCA_FLOWER_UNSPEC) {
705 err = nla_put(skb, mask_type, len, mask);
706 if (err)
707 return err;
708 }
709 return 0;
710}
711
9399ae9a
HHZ		 712static int fl_dump_key_vlan(struct sk_buff *skb,
713 struct flow_dissector_key_vlan *vlan_key,
714 struct flow_dissector_key_vlan *vlan_mask)
715{
716 int err;
717
718 if (!memchr_inv(vlan_mask, 0, sizeof(*vlan_mask)))
719 return 0;
720 if (vlan_mask->vlan_id) {
721 err = nla_put_u16(skb, TCA_FLOWER_KEY_VLAN_ID,
722 vlan_key->vlan_id);
723 if (err)
724 return err;
725 }
726 if (vlan_mask->vlan_priority) {
727 err = nla_put_u8(skb, TCA_FLOWER_KEY_VLAN_PRIO,
728 vlan_key->vlan_priority);
729 if (err)
730 return err;
731 }
732 return 0;
733}
734
77b9900e
JP		 735static int fl_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
736 struct sk_buff *skb, struct tcmsg *t)
737{
738 struct cls_fl_head *head = rtnl_dereference(tp->root);
739 struct cls_fl_filter *f = (struct cls_fl_filter *) fh;
740 struct nlattr *nest;
741 struct fl_flow_key *key, *mask;
742
743 if (!f)
744 return skb->len;
745
746 t->tcm_handle = f->handle;
747
748 nest = nla_nest_start(skb, TCA_OPTIONS);
749 if (!nest)
750 goto nla_put_failure;
751
752 if (f->res.classid &&
753 nla_put_u32(skb, TCA_FLOWER_CLASSID, f->res.classid))
754 goto nla_put_failure;
755
756 key = &f->key;
757 mask = &head->mask.key;
758
759 if (mask->indev_ifindex) {
760 struct net_device *dev;
761
762 dev = __dev_get_by_index(net, key->indev_ifindex);
763 if (dev && nla_put_string(skb, TCA_FLOWER_INDEV, dev->name))
764 goto nla_put_failure;
765 }
766
10cbc684
AV		 767 fl_hw_update_stats(tp, f);
768
77b9900e
JP		 769 if (fl_dump_key_val(skb, key->eth.dst, TCA_FLOWER_KEY_ETH_DST,
770 mask->eth.dst, TCA_FLOWER_KEY_ETH_DST_MASK,
771 sizeof(key->eth.dst)) ||
772 fl_dump_key_val(skb, key->eth.src, TCA_FLOWER_KEY_ETH_SRC,
773 mask->eth.src, TCA_FLOWER_KEY_ETH_SRC_MASK,
774 sizeof(key->eth.src)) ||
775 fl_dump_key_val(skb, &key->basic.n_proto, TCA_FLOWER_KEY_ETH_TYPE,
776 &mask->basic.n_proto, TCA_FLOWER_UNSPEC,
777 sizeof(key->basic.n_proto)))
778 goto nla_put_failure;
9399ae9a
HHZ		 779
780 if (fl_dump_key_vlan(skb, &key->vlan, &mask->vlan))
781 goto nla_put_failure;
782
77b9900e
JP		 783 if ((key->basic.n_proto == htons(ETH_P_IP) ||
784 key->basic.n_proto == htons(ETH_P_IPV6)) &&
785 fl_dump_key_val(skb, &key->basic.ip_proto, TCA_FLOWER_KEY_IP_PROTO,
786 &mask->basic.ip_proto, TCA_FLOWER_UNSPEC,
787 sizeof(key->basic.ip_proto)))
788 goto nla_put_failure;
789
c3f83241 790 if (key->control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS &&
77b9900e
JP		 791 (fl_dump_key_val(skb, &key->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC,
792 &mask->ipv4.src, TCA_FLOWER_KEY_IPV4_SRC_MASK,
793 sizeof(key->ipv4.src)) ||
794 fl_dump_key_val(skb, &key->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST,
795 &mask->ipv4.dst, TCA_FLOWER_KEY_IPV4_DST_MASK,
796 sizeof(key->ipv4.dst))))
797 goto nla_put_failure;
c3f83241 798 else if (key->control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS &&
77b9900e
JP		 799 (fl_dump_key_val(skb, &key->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC,
800 &mask->ipv6.src, TCA_FLOWER_KEY_IPV6_SRC_MASK,
801 sizeof(key->ipv6.src)) ||
802 fl_dump_key_val(skb, &key->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST,
803 &mask->ipv6.dst, TCA_FLOWER_KEY_IPV6_DST_MASK,
804 sizeof(key->ipv6.dst))))
805 goto nla_put_failure;
806
807 if (key->basic.ip_proto == IPPROTO_TCP &&
808 (fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_TCP_SRC,
809 &mask->tp.src, TCA_FLOWER_UNSPEC,
810 sizeof(key->tp.src)) ||
811 fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_TCP_DST,
812 &mask->tp.dst, TCA_FLOWER_UNSPEC,
813 sizeof(key->tp.dst))))
814 goto nla_put_failure;
815 else if (key->basic.ip_proto == IPPROTO_UDP &&
816 (fl_dump_key_val(skb, &key->tp.src, TCA_FLOWER_KEY_UDP_SRC,
817 &mask->tp.src, TCA_FLOWER_UNSPEC,
818 sizeof(key->tp.src)) ||
819 fl_dump_key_val(skb, &key->tp.dst, TCA_FLOWER_KEY_UDP_DST,
820 &mask->tp.dst, TCA_FLOWER_UNSPEC,
821 sizeof(key->tp.dst))))
822 goto nla_put_failure;
823
e69985c6
AV		 824 nla_put_u32(skb, TCA_FLOWER_FLAGS, f->flags);
825
77b9900e
JP		 826 if (tcf_exts_dump(skb, &f->exts))
827 goto nla_put_failure;
828
829 nla_nest_end(skb, nest);
830
831 if (tcf_exts_dump_stats(skb, &f->exts) < 0)
832 goto nla_put_failure;
833
834 return skb->len;
835
836nla_put_failure:
837 nla_nest_cancel(skb, nest);
838 return -1;
839}
840
841static struct tcf_proto_ops cls_fl_ops __read_mostly = {
842 .kind = "flower",
843 .classify = fl_classify,
844 .init = fl_init,
845 .destroy = fl_destroy,
846 .get = fl_get,
847 .change = fl_change,
848 .delete = fl_delete,
849 .walk = fl_walk,
850 .dump = fl_dump,
851 .owner = THIS_MODULE,
852};
853
854static int __init cls_fl_init(void)
855{
856 return register_tcf_proto_ops(&cls_fl_ops);
857}
858
859static void __exit cls_fl_exit(void)
860{
861 unregister_tcf_proto_ops(&cls_fl_ops);
862}
863
864module_init(cls_fl_init);
865module_exit(cls_fl_exit);
866
867MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>");
868MODULE_DESCRIPTION("Flower classifier");
869MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
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