blob: 0751245a6aced60163601b94ab1386e0c5e30565 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * net/sched/cls_tcindex.c Packet classifier for skb->tc_index
3 *
4 * Written 1998,1999 by Werner Almesberger, EPFL ICA
5 */
6
Linus Torvalds1da177e2005-04-16 15:20:36 -07007#include <linux/module.h>
8#include <linux/types.h>
9#include <linux/kernel.h>
10#include <linux/skbuff.h>
11#include <linux/errno.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090012#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <net/act_api.h>
Arnaldo Carvalho de Melodc5fc572007-03-25 23:06:12 -070014#include <net/netlink.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <net/pkt_cls.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016
Linus Torvalds1da177e2005-04-16 15:20:36 -070017/*
18 * Passing parameters to the root seems to be done more awkwardly than really
19 * necessary. At least, u32 doesn't seem to use such dirty hacks. To be
20 * verified. FIXME.
21 */
22
23#define PERFECT_HASH_THRESHOLD 64 /* use perfect hash if not bigger */
24#define DEFAULT_HASH_SIZE 64 /* optimized for diffserv */
25
26
Linus Torvalds1da177e2005-04-16 15:20:36 -070027struct tcindex_filter_result {
28 struct tcf_exts exts;
29 struct tcf_result res;
Alexei Starovoitoved7aa872015-08-25 20:06:33 -070030 struct rcu_head rcu;
Linus Torvalds1da177e2005-04-16 15:20:36 -070031};
32
33struct tcindex_filter {
34 u16 key;
35 struct tcindex_filter_result result;
John Fastabend331b7292014-09-12 20:08:20 -070036 struct tcindex_filter __rcu *next;
37 struct rcu_head rcu;
Linus Torvalds1da177e2005-04-16 15:20:36 -070038};
39
40
41struct tcindex_data {
42 struct tcindex_filter_result *perfect; /* perfect hash; NULL if none */
John Fastabend331b7292014-09-12 20:08:20 -070043 struct tcindex_filter __rcu **h; /* imperfect hash; */
44 struct tcf_proto *tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -070045 u16 mask; /* AND key with mask */
John Fastabend331b7292014-09-12 20:08:20 -070046 u32 shift; /* shift ANDed key to the right */
47 u32 hash; /* hash table size; 0 if undefined */
48 u32 alloc_hash; /* allocated size */
49 u32 fall_through; /* 0: only classify if explicit match */
50 struct rcu_head rcu;
Linus Torvalds1da177e2005-04-16 15:20:36 -070051};
52
Jamal Hadi Salim5a7a5552016-09-18 08:45:33 -040053static inline int tcindex_filter_is_set(struct tcindex_filter_result *r)
Linus Torvalds1da177e2005-04-16 15:20:36 -070054{
55 return tcf_exts_is_predicative(&r->exts) || r->res.classid;
56}
57
Jamal Hadi Salim5a7a5552016-09-18 08:45:33 -040058static struct tcindex_filter_result *tcindex_lookup(struct tcindex_data *p,
59 u16 key)
Linus Torvalds1da177e2005-04-16 15:20:36 -070060{
John Fastabend331b7292014-09-12 20:08:20 -070061 if (p->perfect) {
62 struct tcindex_filter_result *f = p->perfect + key;
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
John Fastabend331b7292014-09-12 20:08:20 -070064 return tcindex_filter_is_set(f) ? f : NULL;
65 } else if (p->h) {
66 struct tcindex_filter __rcu **fp;
67 struct tcindex_filter *f;
68
69 fp = &p->h[key % p->hash];
70 for (f = rcu_dereference_bh_rtnl(*fp);
71 f;
72 fp = &f->next, f = rcu_dereference_bh_rtnl(*fp))
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 if (f->key == key)
74 return &f->result;
75 }
76
77 return NULL;
78}
79
80
Eric Dumazetdc7f9f62011-07-05 23:25:42 +000081static int tcindex_classify(struct sk_buff *skb, const struct tcf_proto *tp,
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 struct tcf_result *res)
83{
WANG Cong2f9a2202014-09-15 14:06:48 -070084 struct tcindex_data *p = rcu_dereference_bh(tp->root);
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 struct tcindex_filter_result *f;
86 int key = (skb->tc_index & p->mask) >> p->shift;
87
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -080088 pr_debug("tcindex_classify(skb %p,tp %p,res %p),p %p\n",
89 skb, tp, res, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
91 f = tcindex_lookup(p, key);
92 if (!f) {
93 if (!p->fall_through)
94 return -1;
95 res->classid = TC_H_MAKE(TC_H_MAJ(tp->q->handle), key);
96 res->class = 0;
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -080097 pr_debug("alg 0x%x\n", res->classid);
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 return 0;
99 }
100 *res = f->res;
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800101 pr_debug("map 0x%x\n", res->classid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
103 return tcf_exts_exec(skb, &f->exts, res);
104}
105
106
107static unsigned long tcindex_get(struct tcf_proto *tp, u32 handle)
108{
John Fastabend331b7292014-09-12 20:08:20 -0700109 struct tcindex_data *p = rtnl_dereference(tp->root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 struct tcindex_filter_result *r;
111
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800112 pr_debug("tcindex_get(tp %p,handle 0x%08x)\n", tp, handle);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 if (p->perfect && handle >= p->alloc_hash)
114 return 0;
115 r = tcindex_lookup(p, handle);
116 return r && tcindex_filter_is_set(r) ? (unsigned long) r : 0UL;
117}
118
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119static int tcindex_init(struct tcf_proto *tp)
120{
121 struct tcindex_data *p;
122
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800123 pr_debug("tcindex_init(tp %p)\n", tp);
124 p = kzalloc(sizeof(struct tcindex_data), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 if (!p)
126 return -ENOMEM;
127
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 p->mask = 0xffff;
129 p->hash = DEFAULT_HASH_SIZE;
130 p->fall_through = 1;
131
John Fastabend331b7292014-09-12 20:08:20 -0700132 rcu_assign_pointer(tp->root, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 return 0;
134}
135
Alexei Starovoitoved7aa872015-08-25 20:06:33 -0700136static void tcindex_destroy_rexts(struct rcu_head *head)
137{
138 struct tcindex_filter_result *r;
139
140 r = container_of(head, struct tcindex_filter_result, rcu);
141 tcf_exts_destroy(&r->exts);
142}
143
144static void tcindex_destroy_fexts(struct rcu_head *head)
145{
Jamal Hadi Salim5a7a5552016-09-18 08:45:33 -0400146 struct tcindex_filter *f = container_of(head, struct tcindex_filter,
147 rcu);
Alexei Starovoitoved7aa872015-08-25 20:06:33 -0700148
149 tcf_exts_destroy(&f->result.exts);
150 kfree(f);
151}
152
153static int tcindex_delete(struct tcf_proto *tp, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154{
John Fastabend331b7292014-09-12 20:08:20 -0700155 struct tcindex_data *p = rtnl_dereference(tp->root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 struct tcindex_filter_result *r = (struct tcindex_filter_result *) arg;
John Fastabend331b7292014-09-12 20:08:20 -0700157 struct tcindex_filter __rcu **walk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 struct tcindex_filter *f = NULL;
159
John Fastabend331b7292014-09-12 20:08:20 -0700160 pr_debug("tcindex_delete(tp %p,arg 0x%lx),p %p\n", tp, arg, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 if (p->perfect) {
162 if (!r->res.class)
163 return -ENOENT;
164 } else {
165 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166
John Fastabend331b7292014-09-12 20:08:20 -0700167 for (i = 0; i < p->hash; i++) {
168 walk = p->h + i;
169 for (f = rtnl_dereference(*walk); f;
170 walk = &f->next, f = rtnl_dereference(*walk)) {
171 if (&f->result == r)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 goto found;
John Fastabend331b7292014-09-12 20:08:20 -0700173 }
174 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 return -ENOENT;
176
177found:
John Fastabend331b7292014-09-12 20:08:20 -0700178 rcu_assign_pointer(*walk, rtnl_dereference(f->next));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 }
180 tcf_unbind_filter(tp, &r->res);
Alexei Starovoitoved7aa872015-08-25 20:06:33 -0700181 /* all classifiers are required to call tcf_exts_destroy() after rcu
182 * grace period, since converted-to-rcu actions are relying on that
183 * in cleanup() callback
184 */
John Fastabend331b7292014-09-12 20:08:20 -0700185 if (f)
Alexei Starovoitoved7aa872015-08-25 20:06:33 -0700186 call_rcu(&f->rcu, tcindex_destroy_fexts);
187 else
188 call_rcu(&r->rcu, tcindex_destroy_rexts);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 return 0;
190}
191
John Fastabend331b7292014-09-12 20:08:20 -0700192static int tcindex_destroy_element(struct tcf_proto *tp,
193 unsigned long arg,
194 struct tcf_walker *walker)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195{
John Fastabend331b7292014-09-12 20:08:20 -0700196 return tcindex_delete(tp, arg);
197}
198
199static void __tcindex_destroy(struct rcu_head *head)
200{
201 struct tcindex_data *p = container_of(head, struct tcindex_data, rcu);
202
203 kfree(p->perfect);
204 kfree(p->h);
205 kfree(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206}
207
208static inline int
209valid_perfect_hash(struct tcindex_data *p)
210{
211 return p->hash > (p->mask >> p->shift);
212}
213
Patrick McHardy6fa8c012008-01-23 20:36:12 -0800214static const struct nla_policy tcindex_policy[TCA_TCINDEX_MAX + 1] = {
215 [TCA_TCINDEX_HASH] = { .type = NLA_U32 },
216 [TCA_TCINDEX_MASK] = { .type = NLA_U16 },
217 [TCA_TCINDEX_SHIFT] = { .type = NLA_U32 },
218 [TCA_TCINDEX_FALL_THROUGH] = { .type = NLA_U32 },
219 [TCA_TCINDEX_CLASSID] = { .type = NLA_U32 },
220};
221
WANG Congb9a24bb2016-08-19 12:36:54 -0700222static int tcindex_filter_result_init(struct tcindex_filter_result *r)
Cong Wangbf63ac72014-05-19 12:15:49 -0700223{
224 memset(r, 0, sizeof(*r));
WANG Congb9a24bb2016-08-19 12:36:54 -0700225 return tcf_exts_init(&r->exts, TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE);
Cong Wangbf63ac72014-05-19 12:15:49 -0700226}
227
John Fastabend331b7292014-09-12 20:08:20 -0700228static void __tcindex_partial_destroy(struct rcu_head *head)
229{
230 struct tcindex_data *p = container_of(head, struct tcindex_data, rcu);
231
232 kfree(p->perfect);
233 kfree(p);
234}
235
WANG Congb9a24bb2016-08-19 12:36:54 -0700236static void tcindex_free_perfect_hash(struct tcindex_data *cp)
237{
238 int i;
239
240 for (i = 0; i < cp->hash; i++)
241 tcf_exts_destroy(&cp->perfect[i].exts);
242 kfree(cp->perfect);
243}
244
245static int tcindex_alloc_perfect_hash(struct tcindex_data *cp)
246{
247 int i, err = 0;
248
249 cp->perfect = kcalloc(cp->hash, sizeof(struct tcindex_filter_result),
250 GFP_KERNEL);
251 if (!cp->perfect)
252 return -ENOMEM;
253
254 for (i = 0; i < cp->hash; i++) {
255 err = tcf_exts_init(&cp->perfect[i].exts,
256 TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE);
257 if (err < 0)
258 goto errout;
259 }
260
261 return 0;
262
263errout:
264 tcindex_free_perfect_hash(cp);
265 return err;
266}
267
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268static int
Benjamin LaHaisec1b52732013-01-14 05:15:39 +0000269tcindex_set_parms(struct net *net, struct tcf_proto *tp, unsigned long base,
270 u32 handle, struct tcindex_data *p,
271 struct tcindex_filter_result *r, struct nlattr **tb,
Cong Wang2f7ef2f2014-04-25 13:54:06 -0700272 struct nlattr *est, bool ovr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 struct tcindex_filter_result new_filter_result, *old_r = r;
275 struct tcindex_filter_result cr;
WANG Congb9a24bb2016-08-19 12:36:54 -0700276 struct tcindex_data *cp = NULL, *oldp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 struct tcindex_filter *f = NULL; /* make gcc behave */
WANG Congb9a24bb2016-08-19 12:36:54 -0700278 int err, balloc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 struct tcf_exts e;
280
WANG Congb9a24bb2016-08-19 12:36:54 -0700281 err = tcf_exts_init(&e, TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 if (err < 0)
283 return err;
WANG Congb9a24bb2016-08-19 12:36:54 -0700284 err = tcf_exts_validate(net, tp, tb, est, &e, ovr);
285 if (err < 0)
286 goto errout;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900287
WANG Cong02c5e842014-09-25 12:06:04 -0700288 err = -ENOMEM;
John Fastabend331b7292014-09-12 20:08:20 -0700289 /* tcindex_data attributes must look atomic to classifier/lookup so
290 * allocate new tcindex data and RCU assign it onto root. Keeping
291 * perfect hash and hash pointers from old data.
292 */
WANG Conga57a65b2014-09-15 14:06:46 -0700293 cp = kzalloc(sizeof(*cp), GFP_KERNEL);
WANG Cong02c5e842014-09-25 12:06:04 -0700294 if (!cp)
WANG Cong44b75e42014-09-15 16:43:42 -0700295 goto errout;
John Fastabend331b7292014-09-12 20:08:20 -0700296
297 cp->mask = p->mask;
298 cp->shift = p->shift;
299 cp->hash = p->hash;
300 cp->alloc_hash = p->alloc_hash;
301 cp->fall_through = p->fall_through;
302 cp->tp = tp;
303
304 if (p->perfect) {
WANG Cong6e056562014-09-30 16:07:23 -0700305 int i;
306
WANG Congb9a24bb2016-08-19 12:36:54 -0700307 if (tcindex_alloc_perfect_hash(cp) < 0)
John Fastabend331b7292014-09-12 20:08:20 -0700308 goto errout;
WANG Cong6e056562014-09-30 16:07:23 -0700309 for (i = 0; i < cp->hash; i++)
WANG Congb9a24bb2016-08-19 12:36:54 -0700310 cp->perfect[i].res = p->perfect[i].res;
WANG Cong44b75e42014-09-15 16:43:42 -0700311 balloc = 1;
John Fastabend331b7292014-09-12 20:08:20 -0700312 }
313 cp->h = p->h;
314
WANG Congb9a24bb2016-08-19 12:36:54 -0700315 err = tcindex_filter_result_init(&new_filter_result);
316 if (err < 0)
317 goto errout1;
318 err = tcindex_filter_result_init(&cr);
319 if (err < 0)
320 goto errout1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 if (old_r)
Cong Wangbf63ac72014-05-19 12:15:49 -0700322 cr.res = r->res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323
Patrick McHardy6fa8c012008-01-23 20:36:12 -0800324 if (tb[TCA_TCINDEX_HASH])
John Fastabend331b7292014-09-12 20:08:20 -0700325 cp->hash = nla_get_u32(tb[TCA_TCINDEX_HASH]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
Patrick McHardy6fa8c012008-01-23 20:36:12 -0800327 if (tb[TCA_TCINDEX_MASK])
John Fastabend331b7292014-09-12 20:08:20 -0700328 cp->mask = nla_get_u16(tb[TCA_TCINDEX_MASK]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
Patrick McHardy6fa8c012008-01-23 20:36:12 -0800330 if (tb[TCA_TCINDEX_SHIFT])
John Fastabend331b7292014-09-12 20:08:20 -0700331 cp->shift = nla_get_u32(tb[TCA_TCINDEX_SHIFT]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332
333 err = -EBUSY;
John Fastabend331b7292014-09-12 20:08:20 -0700334
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 /* Hash already allocated, make sure that we still meet the
336 * requirements for the allocated hash.
337 */
John Fastabend331b7292014-09-12 20:08:20 -0700338 if (cp->perfect) {
339 if (!valid_perfect_hash(cp) ||
340 cp->hash > cp->alloc_hash)
WANG Cong44b75e42014-09-15 16:43:42 -0700341 goto errout_alloc;
John Fastabend331b7292014-09-12 20:08:20 -0700342 } else if (cp->h && cp->hash != cp->alloc_hash) {
WANG Cong44b75e42014-09-15 16:43:42 -0700343 goto errout_alloc;
John Fastabend331b7292014-09-12 20:08:20 -0700344 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345
346 err = -EINVAL;
Patrick McHardy6fa8c012008-01-23 20:36:12 -0800347 if (tb[TCA_TCINDEX_FALL_THROUGH])
John Fastabend331b7292014-09-12 20:08:20 -0700348 cp->fall_through = nla_get_u32(tb[TCA_TCINDEX_FALL_THROUGH]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349
John Fastabend331b7292014-09-12 20:08:20 -0700350 if (!cp->hash) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 /* Hash not specified, use perfect hash if the upper limit
352 * of the hashing index is below the threshold.
353 */
John Fastabend331b7292014-09-12 20:08:20 -0700354 if ((cp->mask >> cp->shift) < PERFECT_HASH_THRESHOLD)
355 cp->hash = (cp->mask >> cp->shift) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 else
John Fastabend331b7292014-09-12 20:08:20 -0700357 cp->hash = DEFAULT_HASH_SIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 }
359
WANG Cong68f6a7c2014-09-25 12:06:05 -0700360 if (!cp->perfect && !cp->h)
John Fastabend331b7292014-09-12 20:08:20 -0700361 cp->alloc_hash = cp->hash;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362
363 /* Note: this could be as restrictive as if (handle & ~(mask >> shift))
364 * but then, we'd fail handles that may become valid after some future
365 * mask change. While this is extremely unlikely to ever matter,
366 * the check below is safer (and also more backwards-compatible).
367 */
John Fastabend331b7292014-09-12 20:08:20 -0700368 if (cp->perfect || valid_perfect_hash(cp))
369 if (handle >= cp->alloc_hash)
WANG Cong44b75e42014-09-15 16:43:42 -0700370 goto errout_alloc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371
372
373 err = -ENOMEM;
John Fastabend331b7292014-09-12 20:08:20 -0700374 if (!cp->perfect && !cp->h) {
375 if (valid_perfect_hash(cp)) {
WANG Congb9a24bb2016-08-19 12:36:54 -0700376 if (tcindex_alloc_perfect_hash(cp) < 0)
WANG Cong44b75e42014-09-15 16:43:42 -0700377 goto errout_alloc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 balloc = 1;
379 } else {
John Fastabend331b7292014-09-12 20:08:20 -0700380 struct tcindex_filter __rcu **hash;
381
382 hash = kcalloc(cp->hash,
383 sizeof(struct tcindex_filter *),
384 GFP_KERNEL);
385
386 if (!hash)
WANG Cong44b75e42014-09-15 16:43:42 -0700387 goto errout_alloc;
John Fastabend331b7292014-09-12 20:08:20 -0700388
389 cp->h = hash;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 balloc = 2;
391 }
392 }
393
John Fastabend331b7292014-09-12 20:08:20 -0700394 if (cp->perfect)
395 r = cp->perfect + handle;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 else
John Fastabend331b7292014-09-12 20:08:20 -0700397 r = tcindex_lookup(cp, handle) ? : &new_filter_result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398
399 if (r == &new_filter_result) {
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700400 f = kzalloc(sizeof(*f), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 if (!f)
402 goto errout_alloc;
WANG Cong6e056562014-09-30 16:07:23 -0700403 f->key = handle;
WANG Cong6e056562014-09-30 16:07:23 -0700404 f->next = NULL;
WANG Congb9a24bb2016-08-19 12:36:54 -0700405 err = tcindex_filter_result_init(&f->result);
406 if (err < 0) {
407 kfree(f);
408 goto errout_alloc;
409 }
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900410 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411
Patrick McHardyadd93b62008-01-22 22:11:33 -0800412 if (tb[TCA_TCINDEX_CLASSID]) {
Patrick McHardy1587bac2008-01-23 20:35:03 -0800413 cr.res.classid = nla_get_u32(tb[TCA_TCINDEX_CLASSID]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 tcf_bind_filter(tp, &cr.res, base);
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900415 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416
Cong Wangbf63ac72014-05-19 12:15:49 -0700417 if (old_r)
418 tcf_exts_change(tp, &r->exts, &e);
419 else
420 tcf_exts_change(tp, &cr.exts, &e);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421
WANG Congb9a24bb2016-08-19 12:36:54 -0700422 if (old_r && old_r != r) {
423 err = tcindex_filter_result_init(old_r);
424 if (err < 0) {
425 kfree(f);
426 goto errout_alloc;
427 }
428 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429
John Fastabend331b7292014-09-12 20:08:20 -0700430 oldp = p;
Cong Wangbf63ac72014-05-19 12:15:49 -0700431 r->res = cr.res;
John Fastabend331b7292014-09-12 20:08:20 -0700432 rcu_assign_pointer(tp->root, cp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433
434 if (r == &new_filter_result) {
John Fastabend331b7292014-09-12 20:08:20 -0700435 struct tcindex_filter *nfp;
436 struct tcindex_filter __rcu **fp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437
WANG Cong6e056562014-09-30 16:07:23 -0700438 tcf_exts_change(tp, &f->result.exts, &r->exts);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439
WANG Cong69301ea2014-09-15 16:43:43 -0700440 fp = cp->h + (handle % cp->hash);
John Fastabend331b7292014-09-12 20:08:20 -0700441 for (nfp = rtnl_dereference(*fp);
442 nfp;
443 fp = &nfp->next, nfp = rtnl_dereference(*fp))
444 ; /* nothing */
445
446 rcu_assign_pointer(*fp, f);
447 }
448
449 if (oldp)
450 call_rcu(&oldp->rcu, __tcindex_partial_destroy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 return 0;
452
453errout_alloc:
454 if (balloc == 1)
WANG Congb9a24bb2016-08-19 12:36:54 -0700455 tcindex_free_perfect_hash(cp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 else if (balloc == 2)
John Fastabend331b7292014-09-12 20:08:20 -0700457 kfree(cp->h);
WANG Congb9a24bb2016-08-19 12:36:54 -0700458errout1:
459 tcf_exts_destroy(&cr.exts);
460 tcf_exts_destroy(&new_filter_result.exts);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461errout:
John Fastabend331b7292014-09-12 20:08:20 -0700462 kfree(cp);
WANG Cong18d02642014-09-25 10:26:37 -0700463 tcf_exts_destroy(&e);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 return err;
465}
466
467static int
Benjamin LaHaisec1b52732013-01-14 05:15:39 +0000468tcindex_change(struct net *net, struct sk_buff *in_skb,
Eric W. Biedermanaf4c6642012-05-25 13:42:45 -0600469 struct tcf_proto *tp, unsigned long base, u32 handle,
Cong Wang2f7ef2f2014-04-25 13:54:06 -0700470 struct nlattr **tca, unsigned long *arg, bool ovr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471{
Patrick McHardyadd93b62008-01-22 22:11:33 -0800472 struct nlattr *opt = tca[TCA_OPTIONS];
473 struct nlattr *tb[TCA_TCINDEX_MAX + 1];
John Fastabend331b7292014-09-12 20:08:20 -0700474 struct tcindex_data *p = rtnl_dereference(tp->root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 struct tcindex_filter_result *r = (struct tcindex_filter_result *) *arg;
Patrick McHardycee63722008-01-23 20:33:32 -0800476 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800478 pr_debug("tcindex_change(tp %p,handle 0x%08x,tca %p,arg %p),opt %p,"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 "p %p,r %p,*arg 0x%lx\n",
480 tp, handle, tca, arg, opt, p, r, arg ? *arg : 0L);
481
482 if (!opt)
483 return 0;
484
Patrick McHardy6fa8c012008-01-23 20:36:12 -0800485 err = nla_parse_nested(tb, TCA_TCINDEX_MAX, opt, tcindex_policy);
Patrick McHardycee63722008-01-23 20:33:32 -0800486 if (err < 0)
487 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488
Benjamin LaHaisec1b52732013-01-14 05:15:39 +0000489 return tcindex_set_parms(net, tp, base, handle, p, r, tb,
Cong Wang2f7ef2f2014-04-25 13:54:06 -0700490 tca[TCA_RATE], ovr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491}
492
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493static void tcindex_walk(struct tcf_proto *tp, struct tcf_walker *walker)
494{
John Fastabend331b7292014-09-12 20:08:20 -0700495 struct tcindex_data *p = rtnl_dereference(tp->root);
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800496 struct tcindex_filter *f, *next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 int i;
498
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800499 pr_debug("tcindex_walk(tp %p,walker %p),p %p\n", tp, walker, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 if (p->perfect) {
501 for (i = 0; i < p->hash; i++) {
502 if (!p->perfect[i].res.class)
503 continue;
504 if (walker->count >= walker->skip) {
505 if (walker->fn(tp,
506 (unsigned long) (p->perfect+i), walker)
507 < 0) {
508 walker->stop = 1;
509 return;
510 }
511 }
512 walker->count++;
513 }
514 }
515 if (!p->h)
516 return;
517 for (i = 0; i < p->hash; i++) {
John Fastabend331b7292014-09-12 20:08:20 -0700518 for (f = rtnl_dereference(p->h[i]); f; f = next) {
519 next = rtnl_dereference(f->next);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 if (walker->count >= walker->skip) {
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800521 if (walker->fn(tp, (unsigned long) &f->result,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 walker) < 0) {
523 walker->stop = 1;
524 return;
525 }
526 }
527 walker->count++;
528 }
529 }
530}
531
Cong Wang1e052be2015-03-06 11:47:59 -0800532static bool tcindex_destroy(struct tcf_proto *tp, bool force)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533{
John Fastabend331b7292014-09-12 20:08:20 -0700534 struct tcindex_data *p = rtnl_dereference(tp->root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 struct tcf_walker walker;
536
Cong Wang1e052be2015-03-06 11:47:59 -0800537 if (!force)
538 return false;
539
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800540 pr_debug("tcindex_destroy(tp %p),p %p\n", tp, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 walker.count = 0;
542 walker.skip = 0;
Himangi Saraogie40f5c72014-07-25 01:50:41 +0530543 walker.fn = tcindex_destroy_element;
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800544 tcindex_walk(tp, &walker);
John Fastabend331b7292014-09-12 20:08:20 -0700545
John Fastabend331b7292014-09-12 20:08:20 -0700546 call_rcu(&p->rcu, __tcindex_destroy);
Cong Wang1e052be2015-03-06 11:47:59 -0800547 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548}
549
550
WANG Cong832d1d52014-01-09 16:14:01 -0800551static int tcindex_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
Jamal Hadi Salim5a7a5552016-09-18 08:45:33 -0400552 struct sk_buff *skb, struct tcmsg *t)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553{
John Fastabend331b7292014-09-12 20:08:20 -0700554 struct tcindex_data *p = rtnl_dereference(tp->root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 struct tcindex_filter_result *r = (struct tcindex_filter_result *) fh;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800556 struct nlattr *nest;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557
Jiri Pirko6ea3b442014-12-09 22:23:29 +0100558 pr_debug("tcindex_dump(tp %p,fh 0x%lx,skb %p,t %p),p %p,r %p\n",
559 tp, fh, skb, t, p, r);
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800560 pr_debug("p->perfect %p p->h %p\n", p->perfect, p->h);
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800561
562 nest = nla_nest_start(skb, TCA_OPTIONS);
563 if (nest == NULL)
564 goto nla_put_failure;
565
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 if (!fh) {
567 t->tcm_handle = ~0; /* whatever ... */
David S. Miller1b34ec42012-03-29 05:11:39 -0400568 if (nla_put_u32(skb, TCA_TCINDEX_HASH, p->hash) ||
569 nla_put_u16(skb, TCA_TCINDEX_MASK, p->mask) ||
570 nla_put_u32(skb, TCA_TCINDEX_SHIFT, p->shift) ||
571 nla_put_u32(skb, TCA_TCINDEX_FALL_THROUGH, p->fall_through))
572 goto nla_put_failure;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800573 nla_nest_end(skb, nest);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 } else {
575 if (p->perfect) {
John Fastabend331b7292014-09-12 20:08:20 -0700576 t->tcm_handle = r - p->perfect;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 } else {
578 struct tcindex_filter *f;
John Fastabend331b7292014-09-12 20:08:20 -0700579 struct tcindex_filter __rcu **fp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 int i;
581
582 t->tcm_handle = 0;
583 for (i = 0; !t->tcm_handle && i < p->hash; i++) {
John Fastabend331b7292014-09-12 20:08:20 -0700584 fp = &p->h[i];
585 for (f = rtnl_dereference(*fp);
586 !t->tcm_handle && f;
587 fp = &f->next, f = rtnl_dereference(*fp)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 if (&f->result == r)
589 t->tcm_handle = f->key;
590 }
591 }
592 }
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800593 pr_debug("handle = %d\n", t->tcm_handle);
David S. Miller1b34ec42012-03-29 05:11:39 -0400594 if (r->res.class &&
595 nla_put_u32(skb, TCA_TCINDEX_CLASSID, r->res.classid))
596 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597
WANG Cong5da57f42013-12-15 20:15:07 -0800598 if (tcf_exts_dump(skb, &r->exts) < 0)
Patrick McHardyadd93b62008-01-22 22:11:33 -0800599 goto nla_put_failure;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800600 nla_nest_end(skb, nest);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601
WANG Cong5da57f42013-12-15 20:15:07 -0800602 if (tcf_exts_dump_stats(skb, &r->exts) < 0)
Patrick McHardyadd93b62008-01-22 22:11:33 -0800603 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 }
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900605
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 return skb->len;
607
Patrick McHardyadd93b62008-01-22 22:11:33 -0800608nla_put_failure:
Jiri Pirko6ea3b442014-12-09 22:23:29 +0100609 nla_nest_cancel(skb, nest);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 return -1;
611}
612
Patrick McHardy2eb9d752008-01-22 22:10:42 -0800613static struct tcf_proto_ops cls_tcindex_ops __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 .kind = "tcindex",
615 .classify = tcindex_classify,
616 .init = tcindex_init,
617 .destroy = tcindex_destroy,
618 .get = tcindex_get,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619 .change = tcindex_change,
620 .delete = tcindex_delete,
621 .walk = tcindex_walk,
622 .dump = tcindex_dump,
623 .owner = THIS_MODULE,
624};
625
626static int __init init_tcindex(void)
627{
628 return register_tcf_proto_ops(&cls_tcindex_ops);
629}
630
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900631static void __exit exit_tcindex(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632{
633 unregister_tcf_proto_ops(&cls_tcindex_ops);
634}
635
636module_init(init_tcindex)
637module_exit(exit_tcindex)
638MODULE_LICENSE("GPL");