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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 (PAGE_SIZE/sizeof(struct fw_filter *))
33
34struct fw_head {
35 struct fw_filter *ht[HTSIZE];
36 u32 mask;
37};
38
39struct fw_filter {
40 struct fw_filter *next;
41 u32 id;
42 struct tcf_result res;
43#ifdef CONFIG_NET_CLS_IND
44 char indev[IFNAMSIZ];
45#endif /* CONFIG_NET_CLS_IND */
46 struct tcf_exts exts;
47};
48
49static const struct tcf_ext_map fw_ext_map = {
50 .action = TCA_FW_ACT,
51 .police = TCA_FW_POLICE
52};
53
54static inline int fw_hash(u32 handle)
55{
56 if (HTSIZE == 4096)
57 return ((handle >> 24) & 0xFFF) ^
58 ((handle >> 12) & 0xFFF) ^
59 (handle & 0xFFF);
60 else if (HTSIZE == 2048)
61 return ((handle >> 22) & 0x7FF) ^
62 ((handle >> 11) & 0x7FF) ^
63 (handle & 0x7FF);
64 else if (HTSIZE == 1024)
65 return ((handle >> 20) & 0x3FF) ^
66 ((handle >> 10) & 0x3FF) ^
67 (handle & 0x3FF);
68 else if (HTSIZE == 512)
69 return (handle >> 27) ^
70 ((handle >> 18) & 0x1FF) ^
71 ((handle >> 9) & 0x1FF) ^
72 (handle & 0x1FF);
73 else if (HTSIZE == 256) {
74 u8 *t = (u8 *) &handle;
75 return t[0] ^ t[1] ^ t[2] ^ t[3];
76 } else
77 return handle & (HTSIZE - 1);
78}
79
80static int fw_classify(struct sk_buff *skb, const struct tcf_proto *tp,
81 struct tcf_result *res)
82{
83 struct fw_head *head = (struct fw_head *)tp->root;
84 struct fw_filter *f;
85 int r;
86 u32 id = skb->mark;
87
88 if (head != NULL) {
89 id &= head->mask;
90 for (f = head->ht[fw_hash(id)]; f; f = f->next) {
91 if (f->id == id) {
92 *res = f->res;
93#ifdef CONFIG_NET_CLS_IND
94 if (!tcf_match_indev(skb, f->indev))
95 continue;
96#endif /* CONFIG_NET_CLS_IND */
97 r = tcf_exts_exec(skb, &f->exts, res);
98 if (r < 0)
99 continue;
100
101 return r;
102 }
103 }
104 } else {
105 /* old method */
106 if (id && (TC_H_MAJ(id) == 0 ||
107 !(TC_H_MAJ(id ^ tp->q->handle)))) {
108 res->classid = id;
109 res->class = 0;
110 return 0;
111 }
112 }
113
114 return -1;
115}
116
117static unsigned long fw_get(struct tcf_proto *tp, u32 handle)
118{
119 struct fw_head *head = (struct fw_head *)tp->root;
120 struct fw_filter *f;
121
122 if (head == NULL)
123 return 0;
124
125 for (f = head->ht[fw_hash(handle)]; f; f = f->next) {
126 if (f->id == handle)
127 return (unsigned long)f;
128 }
129 return 0;
130}
131
132static void fw_put(struct tcf_proto *tp, unsigned long f)
133{
134}
135
136static int fw_init(struct tcf_proto *tp)
137{
138 return 0;
139}
140
141static void fw_delete_filter(struct tcf_proto *tp, struct fw_filter *f)
142{
143 tcf_unbind_filter(tp, &f->res);
144 tcf_exts_destroy(tp, &f->exts);
145 kfree(f);
146}
147
148static void fw_destroy(struct tcf_proto *tp)
149{
150 struct fw_head *head = tp->root;
151 struct fw_filter *f;
152 int h;
153
154 if (head == NULL)
155 return;
156
157 for (h = 0; h < HTSIZE; h++) {
158 while ((f = head->ht[h]) != NULL) {
159 head->ht[h] = f->next;
160 fw_delete_filter(tp, f);
161 }
162 }
163 kfree(head);
164}
165
166static int fw_delete(struct tcf_proto *tp, unsigned long arg)
167{
168 struct fw_head *head = (struct fw_head *)tp->root;
169 struct fw_filter *f = (struct fw_filter *)arg;
170 struct fw_filter **fp;
171
172 if (head == NULL || f == NULL)
173 goto out;
174
175 for (fp = &head->ht[fw_hash(f->id)]; *fp; fp = &(*fp)->next) {
176 if (*fp == f) {
177 tcf_tree_lock(tp);
178 *fp = f->next;
179 tcf_tree_unlock(tp);
180 fw_delete_filter(tp, f);
181 return 0;
182 }
183 }
184out:
185 return -EINVAL;
186}
187
188static const struct nla_policy fw_policy[TCA_FW_MAX + 1] = {
189 [TCA_FW_CLASSID] = { .type = NLA_U32 },
190 [TCA_FW_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ },
191 [TCA_FW_MASK] = { .type = NLA_U32 },
192};
193
194static int
195fw_change_attrs(struct tcf_proto *tp, struct fw_filter *f,
196 struct nlattr **tb, struct nlattr **tca, unsigned long base)
197{
198 struct fw_head *head = (struct fw_head *)tp->root;
199 struct tcf_exts e;
200 u32 mask;
201 int err;
202
203 err = tcf_exts_validate(tp, tb, tca[TCA_RATE], &e, &fw_ext_map);
204 if (err < 0)
205 return err;
206
207 err = -EINVAL;
208 if (tb[TCA_FW_CLASSID]) {
209 f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]);
210 tcf_bind_filter(tp, &f->res, base);
211 }
212
213#ifdef CONFIG_NET_CLS_IND
214 if (tb[TCA_FW_INDEV]) {
215 err = tcf_change_indev(tp, f->indev, tb[TCA_FW_INDEV]);
216 if (err < 0)
217 goto errout;
218 }
219#endif /* CONFIG_NET_CLS_IND */
220
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(tp, &e);
233 return err;
234}
235
236static int fw_change(struct tcf_proto *tp, unsigned long base,
237 u32 handle,
238 struct nlattr **tca,
239 unsigned long *arg)
240{
241 struct fw_head *head = (struct fw_head *)tp->root;
242 struct fw_filter *f = (struct fw_filter *) *arg;
243 struct nlattr *opt = tca[TCA_OPTIONS];
244 struct nlattr *tb[TCA_FW_MAX + 1];
245 int err;
246
247 if (!opt)
248 return handle ? -EINVAL : 0;
249
250 err = nla_parse_nested(tb, TCA_FW_MAX, opt, fw_policy);
251 if (err < 0)
252 return err;
253
254 if (f != NULL) {
255 if (f->id != handle && handle)
256 return -EINVAL;
257 return fw_change_attrs(tp, f, tb, tca, base);
258 }
259
260 if (!handle)
261 return -EINVAL;
262
263 if (head == NULL) {
264 u32 mask = 0xFFFFFFFF;
265 if (tb[TCA_FW_MASK])
266 mask = nla_get_u32(tb[TCA_FW_MASK]);
267
268 head = kzalloc(sizeof(struct fw_head), GFP_KERNEL);
269 if (head == NULL)
270 return -ENOBUFS;
271 head->mask = mask;
272
273 tcf_tree_lock(tp);
274 tp->root = head;
275 tcf_tree_unlock(tp);
276 }
277
278 f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
279 if (f == NULL)
280 return -ENOBUFS;
281
282 f->id = handle;
283
284 err = fw_change_attrs(tp, f, tb, tca, base);
285 if (err < 0)
286 goto errout;
287
288 f->next = head->ht[fw_hash(handle)];
289 tcf_tree_lock(tp);
290 head->ht[fw_hash(handle)] = f;
291 tcf_tree_unlock(tp);
292
293 *arg = (unsigned long)f;
294 return 0;
295
296errout:
297 kfree(f);
298 return err;
299}
300
301static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg)
302{
303 struct fw_head *head = (struct fw_head *)tp->root;
304 int h;
305
306 if (head == NULL)
307 arg->stop = 1;
308
309 if (arg->stop)
310 return;
311
312 for (h = 0; h < HTSIZE; h++) {
313 struct fw_filter *f;
314
315 for (f = head->ht[h]; f; f = f->next) {
316 if (arg->count < arg->skip) {
317 arg->count++;
318 continue;
319 }
320 if (arg->fn(tp, (unsigned long)f, arg) < 0) {
321 arg->stop = 1;
322 return;
323 }
324 arg->count++;
325 }
326 }
327}
328
329static int fw_dump(struct tcf_proto *tp, unsigned long fh,
330 struct sk_buff *skb, struct tcmsg *t)
331{
332 struct fw_head *head = (struct fw_head *)tp->root;
333 struct fw_filter *f = (struct fw_filter *)fh;
334 unsigned char *b = skb_tail_pointer(skb);
335 struct nlattr *nest;
336
337 if (f == NULL)
338 return skb->len;
339
340 t->tcm_handle = f->id;
341
342 if (!f->res.classid && !tcf_exts_is_available(&f->exts))
343 return skb->len;
344
345 nest = nla_nest_start(skb, TCA_OPTIONS);
346 if (nest == NULL)
347 goto nla_put_failure;
348
349 if (f->res.classid &&
350 nla_put_u32(skb, TCA_FW_CLASSID, f->res.classid))
351 goto nla_put_failure;
352#ifdef CONFIG_NET_CLS_IND
353 if (strlen(f->indev) &&
354 nla_put_string(skb, TCA_FW_INDEV, f->indev))
355 goto nla_put_failure;
356#endif /* CONFIG_NET_CLS_IND */
357 if (head->mask != 0xFFFFFFFF &&
358 nla_put_u32(skb, TCA_FW_MASK, head->mask))
359 goto nla_put_failure;
360
361 if (tcf_exts_dump(skb, &f->exts, &fw_ext_map) < 0)
362 goto nla_put_failure;
363
364 nla_nest_end(skb, nest);
365
366 if (tcf_exts_dump_stats(skb, &f->exts, &fw_ext_map) < 0)
367 goto nla_put_failure;
368
369 return skb->len;
370
371nla_put_failure:
372 nlmsg_trim(skb, b);
373 return -1;
374}
375
376static struct tcf_proto_ops cls_fw_ops __read_mostly = {
377 .kind = "fw",
378 .classify = fw_classify,
379 .init = fw_init,
380 .destroy = fw_destroy,
381 .get = fw_get,
382 .put = fw_put,
383 .change = fw_change,
384 .delete = fw_delete,
385 .walk = fw_walk,
386 .dump = fw_dump,
387 .owner = THIS_MODULE,
388};
389
390static int __init init_fw(void)
391{
392 return register_tcf_proto_ops(&cls_fw_ops);
393}
394
395static void __exit exit_fw(void)
396{
397 unregister_tcf_proto_ops(&cls_fw_ops);
398}
399
400module_init(init_fw)
401module_exit(exit_fw)
402MODULE_LICENSE("GPL");
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, void *q,
423 unsigned long base)
424{
425 struct fw_filter *f = fh;
426
427 if (f && f->res.classid == classid) {
428 if (cl)
429 __tcf_bind_filter(q, &f->res, base);
430 else
431 __tcf_unbind_filter(q, &f->res);
432 }
433}
434
435static struct tcf_proto_ops cls_fw_ops __read_mostly = {
436 .kind = "fw",
437 .classify = fw_classify,
438 .init = fw_init,
439 .destroy = fw_destroy,
440 .get = fw_get,
441 .change = fw_change,
442 .delete = fw_delete,
443 .walk = fw_walk,
444 .dump = fw_dump,
445 .bind_class = fw_bind_class,
446 .owner = THIS_MODULE,
447};
448
449static int __init init_fw(void)
450{
451 return register_tcf_proto_ops(&cls_fw_ops);
452}
453
454static void __exit exit_fw(void)
455{
456 unregister_tcf_proto_ops(&cls_fw_ops);
457}
458
459module_init(init_fw)
460module_exit(exit_fw)
461MODULE_LICENSE("GPL");