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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * net/sched/cls_fw.c Classifier mapping ipchains' fwmark to traffic class.
4 *
5 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
6 *
7 * Changes:
8 * Karlis Peisenieks <karlis@mt.lv> : 990415 : fw_walk off by one
9 * Karlis Peisenieks <karlis@mt.lv> : 990415 : fw_delete killed all the filter (and kernel).
10 * Alex <alex@pilotsoft.com> : 2004xxyy: Added Action extension
11 */
12
13#include <linux/module.h>
14#include <linux/slab.h>
15#include <linux/types.h>
16#include <linux/kernel.h>
17#include <linux/string.h>
18#include <linux/errno.h>
19#include <linux/skbuff.h>
20#include <net/netlink.h>
21#include <net/act_api.h>
22#include <net/pkt_cls.h>
23#include <net/sch_generic.h>
24
25#define HTSIZE 256
26
27struct fw_head {
28 u32 mask;
29 struct fw_filter __rcu *ht[HTSIZE];
30 struct rcu_head rcu;
31};
32
33struct fw_filter {
34 struct fw_filter __rcu *next;
35 u32 id;
36 struct tcf_result res;
37 int ifindex;
38 struct tcf_exts exts;
39 struct tcf_proto *tp;
40 struct rcu_work rwork;
41};
42
43static u32 fw_hash(u32 handle)
44{
45 handle ^= (handle >> 16);
46 handle ^= (handle >> 8);
47 return handle % HTSIZE;
48}
49
50static int fw_classify(struct sk_buff *skb, const struct tcf_proto *tp,
51 struct tcf_result *res)
52{
53 struct fw_head *head = rcu_dereference_bh(tp->root);
54 struct fw_filter *f;
55 int r;
56 u32 id = skb->mark;
57
58 if (head != NULL) {
59 id &= head->mask;
60
61 for (f = rcu_dereference_bh(head->ht[fw_hash(id)]); f;
62 f = rcu_dereference_bh(f->next)) {
63 if (f->id == id) {
64 *res = f->res;
65 if (!tcf_match_indev(skb, f->ifindex))
66 continue;
67 r = tcf_exts_exec(skb, &f->exts, res);
68 if (r < 0)
69 continue;
70
71 return r;
72 }
73 }
74 } else {
75 struct Qdisc *q = tcf_block_q(tp->chain->block);
76
77 /* Old method: classify the packet using its skb mark. */
78 if (id && (TC_H_MAJ(id) == 0 ||
79 !(TC_H_MAJ(id ^ q->handle)))) {
80 res->classid = id;
81 res->class = 0;
82 return 0;
83 }
84 }
85
86 return -1;
87}
88
89static void *fw_get(struct tcf_proto *tp, u32 handle)
90{
91 struct fw_head *head = rtnl_dereference(tp->root);
92 struct fw_filter *f;
93
94 if (head == NULL)
95 return NULL;
96
97 f = rtnl_dereference(head->ht[fw_hash(handle)]);
98 for (; f; f = rtnl_dereference(f->next)) {
99 if (f->id == handle)
100 return f;
101 }
102 return NULL;
103}
104
105static int fw_init(struct tcf_proto *tp)
106{
107 /* We don't allocate fw_head here, because in the old method
108 * we don't need it at all.
109 */
110 return 0;
111}
112
113static void __fw_delete_filter(struct fw_filter *f)
114{
115 tcf_exts_destroy(&f->exts);
116 tcf_exts_put_net(&f->exts);
117 kfree(f);
118}
119
120static void fw_delete_filter_work(struct work_struct *work)
121{
122 struct fw_filter *f = container_of(to_rcu_work(work),
123 struct fw_filter,
124 rwork);
125 rtnl_lock();
126 __fw_delete_filter(f);
127 rtnl_unlock();
128}
129
130static void fw_destroy(struct tcf_proto *tp, bool rtnl_held,
131 struct netlink_ext_ack *extack)
132{
133 struct fw_head *head = rtnl_dereference(tp->root);
134 struct fw_filter *f;
135 int h;
136
137 if (head == NULL)
138 return;
139
140 for (h = 0; h < HTSIZE; h++) {
141 while ((f = rtnl_dereference(head->ht[h])) != NULL) {
142 RCU_INIT_POINTER(head->ht[h],
143 rtnl_dereference(f->next));
144 tcf_unbind_filter(tp, &f->res);
145 if (tcf_exts_get_net(&f->exts))
146 tcf_queue_work(&f->rwork, fw_delete_filter_work);
147 else
148 __fw_delete_filter(f);
149 }
150 }
151 kfree_rcu(head, rcu);
152}
153
154static int fw_delete(struct tcf_proto *tp, void *arg, bool *last,
155 bool rtnl_held, struct netlink_ext_ack *extack)
156{
157 struct fw_head *head = rtnl_dereference(tp->root);
158 struct fw_filter *f = arg;
159 struct fw_filter __rcu **fp;
160 struct fw_filter *pfp;
161 int ret = -EINVAL;
162 int h;
163
164 if (head == NULL || f == NULL)
165 goto out;
166
167 fp = &head->ht[fw_hash(f->id)];
168
169 for (pfp = rtnl_dereference(*fp); pfp;
170 fp = &pfp->next, pfp = rtnl_dereference(*fp)) {
171 if (pfp == f) {
172 RCU_INIT_POINTER(*fp, rtnl_dereference(f->next));
173 tcf_unbind_filter(tp, &f->res);
174 tcf_exts_get_net(&f->exts);
175 tcf_queue_work(&f->rwork, fw_delete_filter_work);
176 ret = 0;
177 break;
178 }
179 }
180
181 *last = true;
182 for (h = 0; h < HTSIZE; h++) {
183 if (rcu_access_pointer(head->ht[h])) {
184 *last = false;
185 break;
186 }
187 }
188
189out:
190 return ret;
191}
192
193static const struct nla_policy fw_policy[TCA_FW_MAX + 1] = {
194 [TCA_FW_CLASSID] = { .type = NLA_U32 },
195 [TCA_FW_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ },
196 [TCA_FW_MASK] = { .type = NLA_U32 },
197};
198
199static int fw_set_parms(struct net *net, struct tcf_proto *tp,
200 struct fw_filter *f, struct nlattr **tb,
201 struct nlattr **tca, unsigned long base, bool ovr,
202 struct netlink_ext_ack *extack)
203{
204 struct fw_head *head = rtnl_dereference(tp->root);
205 u32 mask;
206 int err;
207
208 err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &f->exts, ovr,
209 true, extack);
210 if (err < 0)
211 return err;
212
213 if (tb[TCA_FW_CLASSID]) {
214 f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]);
215 tcf_bind_filter(tp, &f->res, base);
216 }
217
218 if (tb[TCA_FW_INDEV]) {
219 int ret;
220 ret = tcf_change_indev(net, tb[TCA_FW_INDEV], extack);
221 if (ret < 0)
222 return ret;
223 f->ifindex = ret;
224 }
225
226 err = -EINVAL;
227 if (tb[TCA_FW_MASK]) {
228 mask = nla_get_u32(tb[TCA_FW_MASK]);
229 if (mask != head->mask)
230 return err;
231 } else if (head->mask != 0xFFFFFFFF)
232 return err;
233
234 return 0;
235}
236
237static int fw_change(struct net *net, struct sk_buff *in_skb,
238 struct tcf_proto *tp, unsigned long base,
239 u32 handle, struct nlattr **tca, void **arg,
240 bool ovr, bool rtnl_held,
241 struct netlink_ext_ack *extack)
242{
243 struct fw_head *head = rtnl_dereference(tp->root);
244 struct fw_filter *f = *arg;
245 struct nlattr *opt = tca[TCA_OPTIONS];
246 struct nlattr *tb[TCA_FW_MAX + 1];
247 int err;
248
249 if (!opt)
250 return handle ? -EINVAL : 0; /* Succeed if it is old method. */
251
252 err = nla_parse_nested_deprecated(tb, TCA_FW_MAX, opt, fw_policy,
253 NULL);
254 if (err < 0)
255 return err;
256
257 if (f) {
258 struct fw_filter *pfp, *fnew;
259 struct fw_filter __rcu **fp;
260
261 if (f->id != handle && handle)
262 return -EINVAL;
263
264 fnew = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
265 if (!fnew)
266 return -ENOBUFS;
267
268 fnew->id = f->id;
269 fnew->res = f->res;
270 fnew->ifindex = f->ifindex;
271 fnew->tp = f->tp;
272
273 err = tcf_exts_init(&fnew->exts, net, TCA_FW_ACT,
274 TCA_FW_POLICE);
275 if (err < 0) {
276 kfree(fnew);
277 return err;
278 }
279
280 err = fw_set_parms(net, tp, fnew, tb, tca, base, ovr, extack);
281 if (err < 0) {
282 tcf_exts_destroy(&fnew->exts);
283 kfree(fnew);
284 return err;
285 }
286
287 fp = &head->ht[fw_hash(fnew->id)];
288 for (pfp = rtnl_dereference(*fp); pfp;
289 fp = &pfp->next, pfp = rtnl_dereference(*fp))
290 if (pfp == f)
291 break;
292
293 RCU_INIT_POINTER(fnew->next, rtnl_dereference(pfp->next));
294 rcu_assign_pointer(*fp, fnew);
295 tcf_unbind_filter(tp, &f->res);
296 tcf_exts_get_net(&f->exts);
297 tcf_queue_work(&f->rwork, fw_delete_filter_work);
298
299 *arg = fnew;
300 return err;
301 }
302
303 if (!handle)
304 return -EINVAL;
305
306 if (!head) {
307 u32 mask = 0xFFFFFFFF;
308 if (tb[TCA_FW_MASK])
309 mask = nla_get_u32(tb[TCA_FW_MASK]);
310
311 head = kzalloc(sizeof(*head), GFP_KERNEL);
312 if (!head)
313 return -ENOBUFS;
314 head->mask = mask;
315
316 rcu_assign_pointer(tp->root, head);
317 }
318
319 f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
320 if (f == NULL)
321 return -ENOBUFS;
322
323 err = tcf_exts_init(&f->exts, net, TCA_FW_ACT, TCA_FW_POLICE);
324 if (err < 0)
325 goto errout;
326 f->id = handle;
327 f->tp = tp;
328
329 err = fw_set_parms(net, tp, f, tb, tca, base, ovr, extack);
330 if (err < 0)
331 goto errout;
332
333 RCU_INIT_POINTER(f->next, head->ht[fw_hash(handle)]);
334 rcu_assign_pointer(head->ht[fw_hash(handle)], f);
335
336 *arg = f;
337 return 0;
338
339errout:
340 tcf_exts_destroy(&f->exts);
341 kfree(f);
342 return err;
343}
344
345static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg,
346 bool rtnl_held)
347{
348 struct fw_head *head = rtnl_dereference(tp->root);
349 int h;
350
351 if (head == NULL)
352 arg->stop = 1;
353
354 if (arg->stop)
355 return;
356
357 for (h = 0; h < HTSIZE; h++) {
358 struct fw_filter *f;
359
360 for (f = rtnl_dereference(head->ht[h]); f;
361 f = rtnl_dereference(f->next)) {
362 if (arg->count < arg->skip) {
363 arg->count++;
364 continue;
365 }
366 if (arg->fn(tp, f, arg) < 0) {
367 arg->stop = 1;
368 return;
369 }
370 arg->count++;
371 }
372 }
373}
374
375static int fw_dump(struct net *net, struct tcf_proto *tp, void *fh,
376 struct sk_buff *skb, struct tcmsg *t, bool rtnl_held)
377{
378 struct fw_head *head = rtnl_dereference(tp->root);
379 struct fw_filter *f = fh;
380 struct nlattr *nest;
381
382 if (f == NULL)
383 return skb->len;
384
385 t->tcm_handle = f->id;
386
387 if (!f->res.classid && !tcf_exts_has_actions(&f->exts))
388 return skb->len;
389
390 nest = nla_nest_start_noflag(skb, TCA_OPTIONS);
391 if (nest == NULL)
392 goto nla_put_failure;
393
394 if (f->res.classid &&
395 nla_put_u32(skb, TCA_FW_CLASSID, f->res.classid))
396 goto nla_put_failure;
397 if (f->ifindex) {
398 struct net_device *dev;
399 dev = __dev_get_by_index(net, f->ifindex);
400 if (dev && nla_put_string(skb, TCA_FW_INDEV, dev->name))
401 goto nla_put_failure;
402 }
403 if (head->mask != 0xFFFFFFFF &&
404 nla_put_u32(skb, TCA_FW_MASK, head->mask))
405 goto nla_put_failure;
406
407 if (tcf_exts_dump(skb, &f->exts) < 0)
408 goto nla_put_failure;
409
410 nla_nest_end(skb, nest);
411
412 if (tcf_exts_dump_stats(skb, &f->exts) < 0)
413 goto nla_put_failure;
414
415 return skb->len;
416
417nla_put_failure:
418 nla_nest_cancel(skb, nest);
419 return -1;
420}
421
422static void fw_bind_class(void *fh, u32 classid, unsigned long cl)
423{
424 struct fw_filter *f = fh;
425
426 if (f && f->res.classid == classid)
427 f->res.class = cl;
428}
429
430static struct tcf_proto_ops cls_fw_ops __read_mostly = {
431 .kind = "fw",
432 .classify = fw_classify,
433 .init = fw_init,
434 .destroy = fw_destroy,
435 .get = fw_get,
436 .change = fw_change,
437 .delete = fw_delete,
438 .walk = fw_walk,
439 .dump = fw_dump,
440 .bind_class = fw_bind_class,
441 .owner = THIS_MODULE,
442};
443
444static int __init init_fw(void)
445{
446 return register_tcf_proto_ops(&cls_fw_ops);
447}
448
449static void __exit exit_fw(void)
450{
451 unregister_tcf_proto_ops(&cls_fw_ops);
452}
453
454module_init(init_fw)
455module_exit(exit_fw)
456MODULE_LICENSE("GPL");
1/*
2 * net/sched/cls_fw.c Classifier mapping ipchains' fwmark to traffic class.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
10 *
11 * Changes:
12 * Karlis Peisenieks <karlis@mt.lv> : 990415 : fw_walk off by one
13 * Karlis Peisenieks <karlis@mt.lv> : 990415 : fw_delete killed all the filter (and kernel).
14 * Alex <alex@pilotsoft.com> : 2004xxyy: Added Action extension
15 *
16 * JHS: We should remove the CONFIG_NET_CLS_IND from here
17 * eventually when the meta match extension is made available
18 *
19 */
20
21#include <linux/module.h>
22#include <linux/slab.h>
23#include <linux/types.h>
24#include <linux/kernel.h>
25#include <linux/string.h>
26#include <linux/errno.h>
27#include <linux/skbuff.h>
28#include <net/netlink.h>
29#include <net/act_api.h>
30#include <net/pkt_cls.h>
31
32#define HTSIZE 256
33
34struct fw_head {
35 u32 mask;
36 struct fw_filter __rcu *ht[HTSIZE];
37 struct rcu_head rcu;
38};
39
40struct fw_filter {
41 struct fw_filter __rcu *next;
42 u32 id;
43 struct tcf_result res;
44#ifdef CONFIG_NET_CLS_IND
45 int ifindex;
46#endif /* CONFIG_NET_CLS_IND */
47 struct tcf_exts exts;
48 struct tcf_proto *tp;
49 struct rcu_head rcu;
50};
51
52static u32 fw_hash(u32 handle)
53{
54 handle ^= (handle >> 16);
55 handle ^= (handle >> 8);
56 return handle % HTSIZE;
57}
58
59static int fw_classify(struct sk_buff *skb, const struct tcf_proto *tp,
60 struct tcf_result *res)
61{
62 struct fw_head *head = rcu_dereference_bh(tp->root);
63 struct fw_filter *f;
64 int r;
65 u32 id = skb->mark;
66
67 if (head != NULL) {
68 id &= head->mask;
69
70 for (f = rcu_dereference_bh(head->ht[fw_hash(id)]); f;
71 f = rcu_dereference_bh(f->next)) {
72 if (f->id == id) {
73 *res = f->res;
74#ifdef CONFIG_NET_CLS_IND
75 if (!tcf_match_indev(skb, f->ifindex))
76 continue;
77#endif /* CONFIG_NET_CLS_IND */
78 r = tcf_exts_exec(skb, &f->exts, res);
79 if (r < 0)
80 continue;
81
82 return r;
83 }
84 }
85 } else {
86 /* Old method: classify the packet using its skb mark. */
87 if (id && (TC_H_MAJ(id) == 0 ||
88 !(TC_H_MAJ(id ^ tp->q->handle)))) {
89 res->classid = id;
90 res->class = 0;
91 return 0;
92 }
93 }
94
95 return -1;
96}
97
98static unsigned long fw_get(struct tcf_proto *tp, u32 handle)
99{
100 struct fw_head *head = rtnl_dereference(tp->root);
101 struct fw_filter *f;
102
103 if (head == NULL)
104 return 0;
105
106 f = rtnl_dereference(head->ht[fw_hash(handle)]);
107 for (; f; f = rtnl_dereference(f->next)) {
108 if (f->id == handle)
109 return (unsigned long)f;
110 }
111 return 0;
112}
113
114static int fw_init(struct tcf_proto *tp)
115{
116 /* We don't allocate fw_head here, because in the old method
117 * we don't need it at all.
118 */
119 return 0;
120}
121
122static void fw_delete_filter(struct rcu_head *head)
123{
124 struct fw_filter *f = container_of(head, struct fw_filter, rcu);
125
126 tcf_exts_destroy(&f->exts);
127 kfree(f);
128}
129
130static bool fw_destroy(struct tcf_proto *tp, bool force)
131{
132 struct fw_head *head = rtnl_dereference(tp->root);
133 struct fw_filter *f;
134 int h;
135
136 if (head == NULL)
137 return true;
138
139 if (!force) {
140 for (h = 0; h < HTSIZE; h++)
141 if (rcu_access_pointer(head->ht[h]))
142 return false;
143 }
144
145 for (h = 0; h < HTSIZE; h++) {
146 while ((f = rtnl_dereference(head->ht[h])) != NULL) {
147 RCU_INIT_POINTER(head->ht[h],
148 rtnl_dereference(f->next));
149 tcf_unbind_filter(tp, &f->res);
150 call_rcu(&f->rcu, fw_delete_filter);
151 }
152 }
153 RCU_INIT_POINTER(tp->root, NULL);
154 kfree_rcu(head, rcu);
155 return true;
156}
157
158static int fw_delete(struct tcf_proto *tp, unsigned long arg)
159{
160 struct fw_head *head = rtnl_dereference(tp->root);
161 struct fw_filter *f = (struct fw_filter *)arg;
162 struct fw_filter __rcu **fp;
163 struct fw_filter *pfp;
164
165 if (head == NULL || f == NULL)
166 goto out;
167
168 fp = &head->ht[fw_hash(f->id)];
169
170 for (pfp = rtnl_dereference(*fp); pfp;
171 fp = &pfp->next, pfp = rtnl_dereference(*fp)) {
172 if (pfp == f) {
173 RCU_INIT_POINTER(*fp, rtnl_dereference(f->next));
174 tcf_unbind_filter(tp, &f->res);
175 call_rcu(&f->rcu, fw_delete_filter);
176 return 0;
177 }
178 }
179out:
180 return -EINVAL;
181}
182
183static const struct nla_policy fw_policy[TCA_FW_MAX + 1] = {
184 [TCA_FW_CLASSID] = { .type = NLA_U32 },
185 [TCA_FW_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ },
186 [TCA_FW_MASK] = { .type = NLA_U32 },
187};
188
189static int
190fw_change_attrs(struct net *net, struct tcf_proto *tp, struct fw_filter *f,
191 struct nlattr **tb, struct nlattr **tca, unsigned long base, bool ovr)
192{
193 struct fw_head *head = rtnl_dereference(tp->root);
194 struct tcf_exts e;
195 u32 mask;
196 int err;
197
198 tcf_exts_init(&e, TCA_FW_ACT, TCA_FW_POLICE);
199 err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &e, ovr);
200 if (err < 0)
201 return err;
202
203 if (tb[TCA_FW_CLASSID]) {
204 f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]);
205 tcf_bind_filter(tp, &f->res, base);
206 }
207
208#ifdef CONFIG_NET_CLS_IND
209 if (tb[TCA_FW_INDEV]) {
210 int ret;
211 ret = tcf_change_indev(net, tb[TCA_FW_INDEV]);
212 if (ret < 0) {
213 err = ret;
214 goto errout;
215 }
216 f->ifindex = ret;
217 }
218#endif /* CONFIG_NET_CLS_IND */
219
220 err = -EINVAL;
221 if (tb[TCA_FW_MASK]) {
222 mask = nla_get_u32(tb[TCA_FW_MASK]);
223 if (mask != head->mask)
224 goto errout;
225 } else if (head->mask != 0xFFFFFFFF)
226 goto errout;
227
228 tcf_exts_change(tp, &f->exts, &e);
229
230 return 0;
231errout:
232 tcf_exts_destroy(&e);
233 return err;
234}
235
236static int fw_change(struct net *net, struct sk_buff *in_skb,
237 struct tcf_proto *tp, unsigned long base,
238 u32 handle,
239 struct nlattr **tca,
240 unsigned long *arg, bool ovr)
241{
242 struct fw_head *head = rtnl_dereference(tp->root);
243 struct fw_filter *f = (struct fw_filter *) *arg;
244 struct nlattr *opt = tca[TCA_OPTIONS];
245 struct nlattr *tb[TCA_FW_MAX + 1];
246 int err;
247
248 if (!opt)
249 return handle ? -EINVAL : 0; /* Succeed if it is old method. */
250
251 err = nla_parse_nested(tb, TCA_FW_MAX, opt, fw_policy);
252 if (err < 0)
253 return err;
254
255 if (f) {
256 struct fw_filter *pfp, *fnew;
257 struct fw_filter __rcu **fp;
258
259 if (f->id != handle && handle)
260 return -EINVAL;
261
262 fnew = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
263 if (!fnew)
264 return -ENOBUFS;
265
266 fnew->id = f->id;
267 fnew->res = f->res;
268#ifdef CONFIG_NET_CLS_IND
269 fnew->ifindex = f->ifindex;
270#endif /* CONFIG_NET_CLS_IND */
271 fnew->tp = f->tp;
272
273 tcf_exts_init(&fnew->exts, TCA_FW_ACT, TCA_FW_POLICE);
274
275 err = fw_change_attrs(net, tp, fnew, tb, tca, base, ovr);
276 if (err < 0) {
277 kfree(fnew);
278 return err;
279 }
280
281 fp = &head->ht[fw_hash(fnew->id)];
282 for (pfp = rtnl_dereference(*fp); pfp;
283 fp = &pfp->next, pfp = rtnl_dereference(*fp))
284 if (pfp == f)
285 break;
286
287 RCU_INIT_POINTER(fnew->next, rtnl_dereference(pfp->next));
288 rcu_assign_pointer(*fp, fnew);
289 tcf_unbind_filter(tp, &f->res);
290 call_rcu(&f->rcu, fw_delete_filter);
291
292 *arg = (unsigned long)fnew;
293 return err;
294 }
295
296 if (!handle)
297 return -EINVAL;
298
299 if (!head) {
300 u32 mask = 0xFFFFFFFF;
301 if (tb[TCA_FW_MASK])
302 mask = nla_get_u32(tb[TCA_FW_MASK]);
303
304 head = kzalloc(sizeof(*head), GFP_KERNEL);
305 if (!head)
306 return -ENOBUFS;
307 head->mask = mask;
308
309 rcu_assign_pointer(tp->root, head);
310 }
311
312 f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
313 if (f == NULL)
314 return -ENOBUFS;
315
316 tcf_exts_init(&f->exts, TCA_FW_ACT, TCA_FW_POLICE);
317 f->id = handle;
318 f->tp = tp;
319
320 err = fw_change_attrs(net, tp, f, tb, tca, base, ovr);
321 if (err < 0)
322 goto errout;
323
324 RCU_INIT_POINTER(f->next, head->ht[fw_hash(handle)]);
325 rcu_assign_pointer(head->ht[fw_hash(handle)], f);
326
327 *arg = (unsigned long)f;
328 return 0;
329
330errout:
331 kfree(f);
332 return err;
333}
334
335static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg)
336{
337 struct fw_head *head = rtnl_dereference(tp->root);
338 int h;
339
340 if (head == NULL)
341 arg->stop = 1;
342
343 if (arg->stop)
344 return;
345
346 for (h = 0; h < HTSIZE; h++) {
347 struct fw_filter *f;
348
349 for (f = rtnl_dereference(head->ht[h]); f;
350 f = rtnl_dereference(f->next)) {
351 if (arg->count < arg->skip) {
352 arg->count++;
353 continue;
354 }
355 if (arg->fn(tp, (unsigned long)f, arg) < 0) {
356 arg->stop = 1;
357 return;
358 }
359 arg->count++;
360 }
361 }
362}
363
364static int fw_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
365 struct sk_buff *skb, struct tcmsg *t)
366{
367 struct fw_head *head = rtnl_dereference(tp->root);
368 struct fw_filter *f = (struct fw_filter *)fh;
369 struct nlattr *nest;
370
371 if (f == NULL)
372 return skb->len;
373
374 t->tcm_handle = f->id;
375
376 if (!f->res.classid && !tcf_exts_is_available(&f->exts))
377 return skb->len;
378
379 nest = nla_nest_start(skb, TCA_OPTIONS);
380 if (nest == NULL)
381 goto nla_put_failure;
382
383 if (f->res.classid &&
384 nla_put_u32(skb, TCA_FW_CLASSID, f->res.classid))
385 goto nla_put_failure;
386#ifdef CONFIG_NET_CLS_IND
387 if (f->ifindex) {
388 struct net_device *dev;
389 dev = __dev_get_by_index(net, f->ifindex);
390 if (dev && nla_put_string(skb, TCA_FW_INDEV, dev->name))
391 goto nla_put_failure;
392 }
393#endif /* CONFIG_NET_CLS_IND */
394 if (head->mask != 0xFFFFFFFF &&
395 nla_put_u32(skb, TCA_FW_MASK, head->mask))
396 goto nla_put_failure;
397
398 if (tcf_exts_dump(skb, &f->exts) < 0)
399 goto nla_put_failure;
400
401 nla_nest_end(skb, nest);
402
403 if (tcf_exts_dump_stats(skb, &f->exts) < 0)
404 goto nla_put_failure;
405
406 return skb->len;
407
408nla_put_failure:
409 nla_nest_cancel(skb, nest);
410 return -1;
411}
412
413static struct tcf_proto_ops cls_fw_ops __read_mostly = {
414 .kind = "fw",
415 .classify = fw_classify,
416 .init = fw_init,
417 .destroy = fw_destroy,
418 .get = fw_get,
419 .change = fw_change,
420 .delete = fw_delete,
421 .walk = fw_walk,
422 .dump = fw_dump,
423 .owner = THIS_MODULE,
424};
425
426static int __init init_fw(void)
427{
428 return register_tcf_proto_ops(&cls_fw_ops);
429}
430
431static void __exit exit_fw(void)
432{
433 unregister_tcf_proto_ops(&cls_fw_ops);
434}
435
436module_init(init_fw)
437module_exit(exit_fw)
438MODULE_LICENSE("GPL");