blob: bd49bf547a479f139b25e0507b090d51c137c519 [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;
30};
31
32struct tcindex_filter {
33 u16 key;
34 struct tcindex_filter_result result;
John Fastabend331b7292014-09-12 20:08:20 -070035 struct tcindex_filter __rcu *next;
36 struct rcu_head rcu;
Linus Torvalds1da177e2005-04-16 15:20:36 -070037};
38
39
40struct tcindex_data {
41 struct tcindex_filter_result *perfect; /* perfect hash; NULL if none */
John Fastabend331b7292014-09-12 20:08:20 -070042 struct tcindex_filter __rcu **h; /* imperfect hash; */
43 struct tcf_proto *tp;
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 u16 mask; /* AND key with mask */
John Fastabend331b7292014-09-12 20:08:20 -070045 u32 shift; /* shift ANDed key to the right */
46 u32 hash; /* hash table size; 0 if undefined */
47 u32 alloc_hash; /* allocated size */
48 u32 fall_through; /* 0: only classify if explicit match */
49 struct rcu_head rcu;
Linus Torvalds1da177e2005-04-16 15:20:36 -070050};
51
Linus Torvalds1da177e2005-04-16 15:20:36 -070052static inline int
53tcindex_filter_is_set(struct tcindex_filter_result *r)
54{
55 return tcf_exts_is_predicative(&r->exts) || r->res.classid;
56}
57
58static struct tcindex_filter_result *
59tcindex_lookup(struct tcindex_data *p, u16 key)
60{
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136static int
John Fastabend331b7292014-09-12 20:08:20 -0700137tcindex_delete(struct tcf_proto *tp, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138{
John Fastabend331b7292014-09-12 20:08:20 -0700139 struct tcindex_data *p = rtnl_dereference(tp->root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 struct tcindex_filter_result *r = (struct tcindex_filter_result *) arg;
John Fastabend331b7292014-09-12 20:08:20 -0700141 struct tcindex_filter __rcu **walk;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 struct tcindex_filter *f = NULL;
143
John Fastabend331b7292014-09-12 20:08:20 -0700144 pr_debug("tcindex_delete(tp %p,arg 0x%lx),p %p\n", tp, arg, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 if (p->perfect) {
146 if (!r->res.class)
147 return -ENOENT;
148 } else {
149 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150
John Fastabend331b7292014-09-12 20:08:20 -0700151 for (i = 0; i < p->hash; i++) {
152 walk = p->h + i;
153 for (f = rtnl_dereference(*walk); f;
154 walk = &f->next, f = rtnl_dereference(*walk)) {
155 if (&f->result == r)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 goto found;
John Fastabend331b7292014-09-12 20:08:20 -0700157 }
158 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 return -ENOENT;
160
161found:
John Fastabend331b7292014-09-12 20:08:20 -0700162 rcu_assign_pointer(*walk, rtnl_dereference(f->next));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 }
164 tcf_unbind_filter(tp, &r->res);
WANG Cong18d02642014-09-25 10:26:37 -0700165 tcf_exts_destroy(&r->exts);
John Fastabend331b7292014-09-12 20:08:20 -0700166 if (f)
167 kfree_rcu(f, rcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 return 0;
169}
170
John Fastabend331b7292014-09-12 20:08:20 -0700171static int tcindex_destroy_element(struct tcf_proto *tp,
172 unsigned long arg,
173 struct tcf_walker *walker)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174{
John Fastabend331b7292014-09-12 20:08:20 -0700175 return tcindex_delete(tp, arg);
176}
177
178static void __tcindex_destroy(struct rcu_head *head)
179{
180 struct tcindex_data *p = container_of(head, struct tcindex_data, rcu);
181
182 kfree(p->perfect);
183 kfree(p->h);
184 kfree(p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185}
186
187static inline int
188valid_perfect_hash(struct tcindex_data *p)
189{
190 return p->hash > (p->mask >> p->shift);
191}
192
Patrick McHardy6fa8c012008-01-23 20:36:12 -0800193static const struct nla_policy tcindex_policy[TCA_TCINDEX_MAX + 1] = {
194 [TCA_TCINDEX_HASH] = { .type = NLA_U32 },
195 [TCA_TCINDEX_MASK] = { .type = NLA_U16 },
196 [TCA_TCINDEX_SHIFT] = { .type = NLA_U32 },
197 [TCA_TCINDEX_FALL_THROUGH] = { .type = NLA_U32 },
198 [TCA_TCINDEX_CLASSID] = { .type = NLA_U32 },
199};
200
Cong Wangbf63ac72014-05-19 12:15:49 -0700201static void tcindex_filter_result_init(struct tcindex_filter_result *r)
202{
203 memset(r, 0, sizeof(*r));
204 tcf_exts_init(&r->exts, TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE);
205}
206
John Fastabend331b7292014-09-12 20:08:20 -0700207static void __tcindex_partial_destroy(struct rcu_head *head)
208{
209 struct tcindex_data *p = container_of(head, struct tcindex_data, rcu);
210
211 kfree(p->perfect);
212 kfree(p);
213}
214
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215static int
Benjamin LaHaisec1b52732013-01-14 05:15:39 +0000216tcindex_set_parms(struct net *net, struct tcf_proto *tp, unsigned long base,
217 u32 handle, struct tcindex_data *p,
218 struct tcindex_filter_result *r, struct nlattr **tb,
Cong Wang2f7ef2f2014-04-25 13:54:06 -0700219 struct nlattr *est, bool ovr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220{
221 int err, balloc = 0;
222 struct tcindex_filter_result new_filter_result, *old_r = r;
223 struct tcindex_filter_result cr;
John Fastabend331b7292014-09-12 20:08:20 -0700224 struct tcindex_data *cp, *oldp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 struct tcindex_filter *f = NULL; /* make gcc behave */
226 struct tcf_exts e;
227
WANG Cong5da57f42013-12-15 20:15:07 -0800228 tcf_exts_init(&e, TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE);
Cong Wang2f7ef2f2014-04-25 13:54:06 -0700229 err = tcf_exts_validate(net, tp, tb, est, &e, ovr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 if (err < 0)
231 return err;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900232
WANG Cong02c5e842014-09-25 12:06:04 -0700233 err = -ENOMEM;
John Fastabend331b7292014-09-12 20:08:20 -0700234 /* tcindex_data attributes must look atomic to classifier/lookup so
235 * allocate new tcindex data and RCU assign it onto root. Keeping
236 * perfect hash and hash pointers from old data.
237 */
WANG Conga57a65b2014-09-15 14:06:46 -0700238 cp = kzalloc(sizeof(*cp), GFP_KERNEL);
WANG Cong02c5e842014-09-25 12:06:04 -0700239 if (!cp)
WANG Cong44b75e42014-09-15 16:43:42 -0700240 goto errout;
John Fastabend331b7292014-09-12 20:08:20 -0700241
242 cp->mask = p->mask;
243 cp->shift = p->shift;
244 cp->hash = p->hash;
245 cp->alloc_hash = p->alloc_hash;
246 cp->fall_through = p->fall_through;
247 cp->tp = tp;
248
249 if (p->perfect) {
WANG Cong6e056562014-09-30 16:07:23 -0700250 int i;
251
John Fastabend331b7292014-09-12 20:08:20 -0700252 cp->perfect = kmemdup(p->perfect,
253 sizeof(*r) * cp->hash, GFP_KERNEL);
254 if (!cp->perfect)
255 goto errout;
WANG Cong6e056562014-09-30 16:07:23 -0700256 for (i = 0; i < cp->hash; i++)
257 tcf_exts_init(&cp->perfect[i].exts,
258 TCA_TCINDEX_ACT, TCA_TCINDEX_POLICE);
WANG Cong44b75e42014-09-15 16:43:42 -0700259 balloc = 1;
John Fastabend331b7292014-09-12 20:08:20 -0700260 }
261 cp->h = p->h;
262
WANG Cong10ee1c32014-09-15 14:06:49 -0700263 tcindex_filter_result_init(&new_filter_result);
Cong Wangbf63ac72014-05-19 12:15:49 -0700264 tcindex_filter_result_init(&cr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 if (old_r)
Cong Wangbf63ac72014-05-19 12:15:49 -0700266 cr.res = r->res;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267
Patrick McHardy6fa8c012008-01-23 20:36:12 -0800268 if (tb[TCA_TCINDEX_HASH])
John Fastabend331b7292014-09-12 20:08:20 -0700269 cp->hash = nla_get_u32(tb[TCA_TCINDEX_HASH]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270
Patrick McHardy6fa8c012008-01-23 20:36:12 -0800271 if (tb[TCA_TCINDEX_MASK])
John Fastabend331b7292014-09-12 20:08:20 -0700272 cp->mask = nla_get_u16(tb[TCA_TCINDEX_MASK]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273
Patrick McHardy6fa8c012008-01-23 20:36:12 -0800274 if (tb[TCA_TCINDEX_SHIFT])
John Fastabend331b7292014-09-12 20:08:20 -0700275 cp->shift = nla_get_u32(tb[TCA_TCINDEX_SHIFT]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276
277 err = -EBUSY;
John Fastabend331b7292014-09-12 20:08:20 -0700278
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 /* Hash already allocated, make sure that we still meet the
280 * requirements for the allocated hash.
281 */
John Fastabend331b7292014-09-12 20:08:20 -0700282 if (cp->perfect) {
283 if (!valid_perfect_hash(cp) ||
284 cp->hash > cp->alloc_hash)
WANG Cong44b75e42014-09-15 16:43:42 -0700285 goto errout_alloc;
John Fastabend331b7292014-09-12 20:08:20 -0700286 } else if (cp->h && cp->hash != cp->alloc_hash) {
WANG Cong44b75e42014-09-15 16:43:42 -0700287 goto errout_alloc;
John Fastabend331b7292014-09-12 20:08:20 -0700288 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289
290 err = -EINVAL;
Patrick McHardy6fa8c012008-01-23 20:36:12 -0800291 if (tb[TCA_TCINDEX_FALL_THROUGH])
John Fastabend331b7292014-09-12 20:08:20 -0700292 cp->fall_through = nla_get_u32(tb[TCA_TCINDEX_FALL_THROUGH]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293
John Fastabend331b7292014-09-12 20:08:20 -0700294 if (!cp->hash) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 /* Hash not specified, use perfect hash if the upper limit
296 * of the hashing index is below the threshold.
297 */
John Fastabend331b7292014-09-12 20:08:20 -0700298 if ((cp->mask >> cp->shift) < PERFECT_HASH_THRESHOLD)
299 cp->hash = (cp->mask >> cp->shift) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 else
John Fastabend331b7292014-09-12 20:08:20 -0700301 cp->hash = DEFAULT_HASH_SIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 }
303
WANG Cong68f6a7c2014-09-25 12:06:05 -0700304 if (!cp->perfect && !cp->h)
John Fastabend331b7292014-09-12 20:08:20 -0700305 cp->alloc_hash = cp->hash;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306
307 /* Note: this could be as restrictive as if (handle & ~(mask >> shift))
308 * but then, we'd fail handles that may become valid after some future
309 * mask change. While this is extremely unlikely to ever matter,
310 * the check below is safer (and also more backwards-compatible).
311 */
John Fastabend331b7292014-09-12 20:08:20 -0700312 if (cp->perfect || valid_perfect_hash(cp))
313 if (handle >= cp->alloc_hash)
WANG Cong44b75e42014-09-15 16:43:42 -0700314 goto errout_alloc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315
316
317 err = -ENOMEM;
John Fastabend331b7292014-09-12 20:08:20 -0700318 if (!cp->perfect && !cp->h) {
319 if (valid_perfect_hash(cp)) {
Cong Wangbf63ac72014-05-19 12:15:49 -0700320 int i;
321
John Fastabend331b7292014-09-12 20:08:20 -0700322 cp->perfect = kcalloc(cp->hash, sizeof(*r), GFP_KERNEL);
323 if (!cp->perfect)
WANG Cong44b75e42014-09-15 16:43:42 -0700324 goto errout_alloc;
John Fastabend331b7292014-09-12 20:08:20 -0700325 for (i = 0; i < cp->hash; i++)
326 tcf_exts_init(&cp->perfect[i].exts,
327 TCA_TCINDEX_ACT,
Cong Wangbf63ac72014-05-19 12:15:49 -0700328 TCA_TCINDEX_POLICE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 balloc = 1;
330 } else {
John Fastabend331b7292014-09-12 20:08:20 -0700331 struct tcindex_filter __rcu **hash;
332
333 hash = kcalloc(cp->hash,
334 sizeof(struct tcindex_filter *),
335 GFP_KERNEL);
336
337 if (!hash)
WANG Cong44b75e42014-09-15 16:43:42 -0700338 goto errout_alloc;
John Fastabend331b7292014-09-12 20:08:20 -0700339
340 cp->h = hash;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 balloc = 2;
342 }
343 }
344
John Fastabend331b7292014-09-12 20:08:20 -0700345 if (cp->perfect)
346 r = cp->perfect + handle;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 else
John Fastabend331b7292014-09-12 20:08:20 -0700348 r = tcindex_lookup(cp, handle) ? : &new_filter_result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349
350 if (r == &new_filter_result) {
Panagiotis Issaris0da974f2006-07-21 14:51:30 -0700351 f = kzalloc(sizeof(*f), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 if (!f)
353 goto errout_alloc;
WANG Cong6e056562014-09-30 16:07:23 -0700354 f->key = handle;
355 tcindex_filter_result_init(&f->result);
356 f->next = NULL;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900357 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358
Patrick McHardyadd93b62008-01-22 22:11:33 -0800359 if (tb[TCA_TCINDEX_CLASSID]) {
Patrick McHardy1587bac2008-01-23 20:35:03 -0800360 cr.res.classid = nla_get_u32(tb[TCA_TCINDEX_CLASSID]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 tcf_bind_filter(tp, &cr.res, base);
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900362 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363
Cong Wangbf63ac72014-05-19 12:15:49 -0700364 if (old_r)
365 tcf_exts_change(tp, &r->exts, &e);
366 else
367 tcf_exts_change(tp, &cr.exts, &e);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 if (old_r && old_r != r)
Cong Wangbf63ac72014-05-19 12:15:49 -0700370 tcindex_filter_result_init(old_r);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371
John Fastabend331b7292014-09-12 20:08:20 -0700372 oldp = p;
Cong Wangbf63ac72014-05-19 12:15:49 -0700373 r->res = cr.res;
John Fastabend331b7292014-09-12 20:08:20 -0700374 rcu_assign_pointer(tp->root, cp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375
376 if (r == &new_filter_result) {
John Fastabend331b7292014-09-12 20:08:20 -0700377 struct tcindex_filter *nfp;
378 struct tcindex_filter __rcu **fp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379
WANG Cong6e056562014-09-30 16:07:23 -0700380 tcf_exts_change(tp, &f->result.exts, &r->exts);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381
WANG Cong69301ea2014-09-15 16:43:43 -0700382 fp = cp->h + (handle % cp->hash);
John Fastabend331b7292014-09-12 20:08:20 -0700383 for (nfp = rtnl_dereference(*fp);
384 nfp;
385 fp = &nfp->next, nfp = rtnl_dereference(*fp))
386 ; /* nothing */
387
388 rcu_assign_pointer(*fp, f);
389 }
390
391 if (oldp)
392 call_rcu(&oldp->rcu, __tcindex_partial_destroy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 return 0;
394
395errout_alloc:
396 if (balloc == 1)
John Fastabend331b7292014-09-12 20:08:20 -0700397 kfree(cp->perfect);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 else if (balloc == 2)
John Fastabend331b7292014-09-12 20:08:20 -0700399 kfree(cp->h);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400errout:
John Fastabend331b7292014-09-12 20:08:20 -0700401 kfree(cp);
WANG Cong18d02642014-09-25 10:26:37 -0700402 tcf_exts_destroy(&e);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 return err;
404}
405
406static int
Benjamin LaHaisec1b52732013-01-14 05:15:39 +0000407tcindex_change(struct net *net, struct sk_buff *in_skb,
Eric W. Biedermanaf4c6642012-05-25 13:42:45 -0600408 struct tcf_proto *tp, unsigned long base, u32 handle,
Cong Wang2f7ef2f2014-04-25 13:54:06 -0700409 struct nlattr **tca, unsigned long *arg, bool ovr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410{
Patrick McHardyadd93b62008-01-22 22:11:33 -0800411 struct nlattr *opt = tca[TCA_OPTIONS];
412 struct nlattr *tb[TCA_TCINDEX_MAX + 1];
John Fastabend331b7292014-09-12 20:08:20 -0700413 struct tcindex_data *p = rtnl_dereference(tp->root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 struct tcindex_filter_result *r = (struct tcindex_filter_result *) *arg;
Patrick McHardycee63722008-01-23 20:33:32 -0800415 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800417 pr_debug("tcindex_change(tp %p,handle 0x%08x,tca %p,arg %p),opt %p,"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 "p %p,r %p,*arg 0x%lx\n",
419 tp, handle, tca, arg, opt, p, r, arg ? *arg : 0L);
420
421 if (!opt)
422 return 0;
423
Patrick McHardy6fa8c012008-01-23 20:36:12 -0800424 err = nla_parse_nested(tb, TCA_TCINDEX_MAX, opt, tcindex_policy);
Patrick McHardycee63722008-01-23 20:33:32 -0800425 if (err < 0)
426 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427
Benjamin LaHaisec1b52732013-01-14 05:15:39 +0000428 return tcindex_set_parms(net, tp, base, handle, p, r, tb,
Cong Wang2f7ef2f2014-04-25 13:54:06 -0700429 tca[TCA_RATE], ovr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430}
431
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432static void tcindex_walk(struct tcf_proto *tp, struct tcf_walker *walker)
433{
John Fastabend331b7292014-09-12 20:08:20 -0700434 struct tcindex_data *p = rtnl_dereference(tp->root);
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800435 struct tcindex_filter *f, *next;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 int i;
437
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800438 pr_debug("tcindex_walk(tp %p,walker %p),p %p\n", tp, walker, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 if (p->perfect) {
440 for (i = 0; i < p->hash; i++) {
441 if (!p->perfect[i].res.class)
442 continue;
443 if (walker->count >= walker->skip) {
444 if (walker->fn(tp,
445 (unsigned long) (p->perfect+i), walker)
446 < 0) {
447 walker->stop = 1;
448 return;
449 }
450 }
451 walker->count++;
452 }
453 }
454 if (!p->h)
455 return;
456 for (i = 0; i < p->hash; i++) {
John Fastabend331b7292014-09-12 20:08:20 -0700457 for (f = rtnl_dereference(p->h[i]); f; f = next) {
458 next = rtnl_dereference(f->next);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 if (walker->count >= walker->skip) {
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800460 if (walker->fn(tp, (unsigned long) &f->result,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 walker) < 0) {
462 walker->stop = 1;
463 return;
464 }
465 }
466 walker->count++;
467 }
468 }
469}
470
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471static void tcindex_destroy(struct tcf_proto *tp)
472{
John Fastabend331b7292014-09-12 20:08:20 -0700473 struct tcindex_data *p = rtnl_dereference(tp->root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 struct tcf_walker walker;
475
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800476 pr_debug("tcindex_destroy(tp %p),p %p\n", tp, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 walker.count = 0;
478 walker.skip = 0;
Himangi Saraogie40f5c72014-07-25 01:50:41 +0530479 walker.fn = tcindex_destroy_element;
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800480 tcindex_walk(tp, &walker);
John Fastabend331b7292014-09-12 20:08:20 -0700481
482 RCU_INIT_POINTER(tp->root, NULL);
483 call_rcu(&p->rcu, __tcindex_destroy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484}
485
486
WANG Cong832d1d52014-01-09 16:14:01 -0800487static int tcindex_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 struct sk_buff *skb, struct tcmsg *t)
489{
John Fastabend331b7292014-09-12 20:08:20 -0700490 struct tcindex_data *p = rtnl_dereference(tp->root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 struct tcindex_filter_result *r = (struct tcindex_filter_result *) fh;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800492 struct nlattr *nest;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493
Jiri Pirko6ea3b442014-12-09 22:23:29 +0100494 pr_debug("tcindex_dump(tp %p,fh 0x%lx,skb %p,t %p),p %p,r %p\n",
495 tp, fh, skb, t, p, r);
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800496 pr_debug("p->perfect %p p->h %p\n", p->perfect, p->h);
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800497
498 nest = nla_nest_start(skb, TCA_OPTIONS);
499 if (nest == NULL)
500 goto nla_put_failure;
501
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 if (!fh) {
503 t->tcm_handle = ~0; /* whatever ... */
David S. Miller1b34ec42012-03-29 05:11:39 -0400504 if (nla_put_u32(skb, TCA_TCINDEX_HASH, p->hash) ||
505 nla_put_u16(skb, TCA_TCINDEX_MASK, p->mask) ||
506 nla_put_u32(skb, TCA_TCINDEX_SHIFT, p->shift) ||
507 nla_put_u32(skb, TCA_TCINDEX_FALL_THROUGH, p->fall_through))
508 goto nla_put_failure;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800509 nla_nest_end(skb, nest);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 } else {
511 if (p->perfect) {
John Fastabend331b7292014-09-12 20:08:20 -0700512 t->tcm_handle = r - p->perfect;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 } else {
514 struct tcindex_filter *f;
John Fastabend331b7292014-09-12 20:08:20 -0700515 struct tcindex_filter __rcu **fp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 int i;
517
518 t->tcm_handle = 0;
519 for (i = 0; !t->tcm_handle && i < p->hash; i++) {
John Fastabend331b7292014-09-12 20:08:20 -0700520 fp = &p->h[i];
521 for (f = rtnl_dereference(*fp);
522 !t->tcm_handle && f;
523 fp = &f->next, f = rtnl_dereference(*fp)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 if (&f->result == r)
525 t->tcm_handle = f->key;
526 }
527 }
528 }
Stephen Hemmingeraa767bf2008-01-21 02:26:41 -0800529 pr_debug("handle = %d\n", t->tcm_handle);
David S. Miller1b34ec42012-03-29 05:11:39 -0400530 if (r->res.class &&
531 nla_put_u32(skb, TCA_TCINDEX_CLASSID, r->res.classid))
532 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533
WANG Cong5da57f42013-12-15 20:15:07 -0800534 if (tcf_exts_dump(skb, &r->exts) < 0)
Patrick McHardyadd93b62008-01-22 22:11:33 -0800535 goto nla_put_failure;
Patrick McHardy4b3550ef2008-01-23 20:34:11 -0800536 nla_nest_end(skb, nest);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537
WANG Cong5da57f42013-12-15 20:15:07 -0800538 if (tcf_exts_dump_stats(skb, &r->exts) < 0)
Patrick McHardyadd93b62008-01-22 22:11:33 -0800539 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 }
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900541
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 return skb->len;
543
Patrick McHardyadd93b62008-01-22 22:11:33 -0800544nla_put_failure:
Jiri Pirko6ea3b442014-12-09 22:23:29 +0100545 nla_nest_cancel(skb, nest);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 return -1;
547}
548
Patrick McHardy2eb9d752008-01-22 22:10:42 -0800549static struct tcf_proto_ops cls_tcindex_ops __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 .kind = "tcindex",
551 .classify = tcindex_classify,
552 .init = tcindex_init,
553 .destroy = tcindex_destroy,
554 .get = tcindex_get,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 .change = tcindex_change,
556 .delete = tcindex_delete,
557 .walk = tcindex_walk,
558 .dump = tcindex_dump,
559 .owner = THIS_MODULE,
560};
561
562static int __init init_tcindex(void)
563{
564 return register_tcf_proto_ops(&cls_tcindex_ops);
565}
566
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900567static void __exit exit_tcindex(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568{
569 unregister_tcf_proto_ops(&cls_tcindex_ops);
570}
571
572module_init(init_tcindex)
573module_exit(exit_tcindex)
574MODULE_LICENSE("GPL");