Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | ||
1da177e4 | 21 | #include <linux/module.h> |
5a0e3ad6 | 22 | #include <linux/slab.h> |
1da177e4 LT |
23 | #include <linux/types.h> |
24 | #include <linux/kernel.h> | |
1da177e4 | 25 | #include <linux/string.h> |
1da177e4 | 26 | #include <linux/errno.h> |
1da177e4 | 27 | #include <linux/skbuff.h> |
0ba48053 | 28 | #include <net/netlink.h> |
1da177e4 LT |
29 | #include <net/act_api.h> |
30 | #include <net/pkt_cls.h> | |
31 | ||
d37d8ac1 | 32 | #define HTSIZE 256 |
c5c13faf | 33 | |
cc7ec456 | 34 | struct fw_head { |
d37d8ac1 | 35 | u32 mask; |
33f8b9ec | 36 | bool mask_set; |
e35a8ee5 JF |
37 | struct fw_filter __rcu *ht[HTSIZE]; |
38 | struct rcu_head rcu; | |
1da177e4 LT |
39 | }; |
40 | ||
cc7ec456 | 41 | struct fw_filter { |
e35a8ee5 | 42 | struct fw_filter __rcu *next; |
1da177e4 LT |
43 | u32 id; |
44 | struct tcf_result res; | |
45 | #ifdef CONFIG_NET_CLS_IND | |
2519a602 | 46 | int ifindex; |
1da177e4 LT |
47 | #endif /* CONFIG_NET_CLS_IND */ |
48 | struct tcf_exts exts; | |
e35a8ee5 JF |
49 | struct tcf_proto *tp; |
50 | struct rcu_head rcu; | |
1da177e4 LT |
51 | }; |
52 | ||
d37d8ac1 | 53 | static u32 fw_hash(u32 handle) |
1da177e4 | 54 | { |
d37d8ac1 ED |
55 | handle ^= (handle >> 16); |
56 | handle ^= (handle >> 8); | |
57 | return handle % HTSIZE; | |
1da177e4 LT |
58 | } |
59 | ||
dc7f9f6e | 60 | static int fw_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
1da177e4 LT |
61 | struct tcf_result *res) |
62 | { | |
e35a8ee5 | 63 | struct fw_head *head = rcu_dereference_bh(tp->root); |
1da177e4 LT |
64 | struct fw_filter *f; |
65 | int r; | |
5c804bfd | 66 | u32 id = skb->mark; |
1da177e4 LT |
67 | |
68 | if (head != NULL) { | |
5c804bfd | 69 | id &= head->mask; |
e35a8ee5 JF |
70 | |
71 | for (f = rcu_dereference_bh(head->ht[fw_hash(id)]); f; | |
72 | f = rcu_dereference_bh(f->next)) { | |
1da177e4 LT |
73 | if (f->id == id) { |
74 | *res = f->res; | |
75 | #ifdef CONFIG_NET_CLS_IND | |
2519a602 | 76 | if (!tcf_match_indev(skb, f->ifindex)) |
1da177e4 LT |
77 | continue; |
78 | #endif /* CONFIG_NET_CLS_IND */ | |
79 | r = tcf_exts_exec(skb, &f->exts, res); | |
80 | if (r < 0) | |
81 | continue; | |
82 | ||
83 | return r; | |
84 | } | |
85 | } | |
86 | } else { | |
87 | /* old method */ | |
cc7ec456 ED |
88 | if (id && (TC_H_MAJ(id) == 0 || |
89 | !(TC_H_MAJ(id ^ tp->q->handle)))) { | |
1da177e4 LT |
90 | res->classid = id; |
91 | res->class = 0; | |
92 | return 0; | |
93 | } | |
94 | } | |
95 | ||
96 | return -1; | |
97 | } | |
98 | ||
99 | static unsigned long fw_get(struct tcf_proto *tp, u32 handle) | |
100 | { | |
e35a8ee5 | 101 | struct fw_head *head = rtnl_dereference(tp->root); |
1da177e4 LT |
102 | struct fw_filter *f; |
103 | ||
104 | if (head == NULL) | |
105 | return 0; | |
106 | ||
e35a8ee5 JF |
107 | f = rtnl_dereference(head->ht[fw_hash(handle)]); |
108 | for (; f; f = rtnl_dereference(f->next)) { | |
1da177e4 LT |
109 | if (f->id == handle) |
110 | return (unsigned long)f; | |
111 | } | |
112 | return 0; | |
113 | } | |
114 | ||
1da177e4 LT |
115 | static int fw_init(struct tcf_proto *tp) |
116 | { | |
33f8b9ec WC |
117 | struct fw_head *head; |
118 | ||
119 | head = kzalloc(sizeof(struct fw_head), GFP_KERNEL); | |
120 | if (head == NULL) | |
121 | return -ENOBUFS; | |
122 | ||
123 | head->mask_set = false; | |
124 | rcu_assign_pointer(tp->root, head); | |
1da177e4 LT |
125 | return 0; |
126 | } | |
127 | ||
e35a8ee5 | 128 | static void fw_delete_filter(struct rcu_head *head) |
1da177e4 | 129 | { |
e35a8ee5 | 130 | struct fw_filter *f = container_of(head, struct fw_filter, rcu); |
e35a8ee5 | 131 | |
18d0264f | 132 | tcf_exts_destroy(&f->exts); |
1da177e4 LT |
133 | kfree(f); |
134 | } | |
135 | ||
136 | static void fw_destroy(struct tcf_proto *tp) | |
137 | { | |
e35a8ee5 | 138 | struct fw_head *head = rtnl_dereference(tp->root); |
1da177e4 LT |
139 | struct fw_filter *f; |
140 | int h; | |
141 | ||
142 | if (head == NULL) | |
143 | return; | |
144 | ||
cc7ec456 | 145 | for (h = 0; h < HTSIZE; h++) { |
e35a8ee5 JF |
146 | while ((f = rtnl_dereference(head->ht[h])) != NULL) { |
147 | RCU_INIT_POINTER(head->ht[h], | |
148 | rtnl_dereference(f->next)); | |
18cdb37e | 149 | tcf_unbind_filter(tp, &f->res); |
e35a8ee5 | 150 | call_rcu(&f->rcu, fw_delete_filter); |
1da177e4 LT |
151 | } |
152 | } | |
e35a8ee5 JF |
153 | RCU_INIT_POINTER(tp->root, NULL); |
154 | kfree_rcu(head, rcu); | |
1da177e4 LT |
155 | } |
156 | ||
157 | static int fw_delete(struct tcf_proto *tp, unsigned long arg) | |
158 | { | |
e35a8ee5 | 159 | struct fw_head *head = rtnl_dereference(tp->root); |
cc7ec456 | 160 | struct fw_filter *f = (struct fw_filter *)arg; |
e35a8ee5 JF |
161 | struct fw_filter __rcu **fp; |
162 | struct fw_filter *pfp; | |
1da177e4 LT |
163 | |
164 | if (head == NULL || f == NULL) | |
165 | goto out; | |
166 | ||
e35a8ee5 JF |
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)); | |
18cdb37e | 173 | tcf_unbind_filter(tp, &f->res); |
e35a8ee5 | 174 | call_rcu(&f->rcu, fw_delete_filter); |
1da177e4 LT |
175 | return 0; |
176 | } | |
177 | } | |
178 | out: | |
179 | return -EINVAL; | |
180 | } | |
181 | ||
6fa8c014 PM |
182 | static const struct nla_policy fw_policy[TCA_FW_MAX + 1] = { |
183 | [TCA_FW_CLASSID] = { .type = NLA_U32 }, | |
184 | [TCA_FW_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ }, | |
185 | [TCA_FW_MASK] = { .type = NLA_U32 }, | |
186 | }; | |
187 | ||
1da177e4 | 188 | static int |
c1b52739 | 189 | fw_change_attrs(struct net *net, struct tcf_proto *tp, struct fw_filter *f, |
2f7ef2f8 | 190 | struct nlattr **tb, struct nlattr **tca, unsigned long base, bool ovr) |
1da177e4 | 191 | { |
e35a8ee5 | 192 | struct fw_head *head = rtnl_dereference(tp->root); |
1da177e4 | 193 | struct tcf_exts e; |
b4e9b520 | 194 | u32 mask; |
1da177e4 LT |
195 | int err; |
196 | ||
5da57f42 | 197 | tcf_exts_init(&e, TCA_FW_ACT, TCA_FW_POLICE); |
2f7ef2f8 | 198 | err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &e, ovr); |
1da177e4 LT |
199 | if (err < 0) |
200 | return err; | |
201 | ||
add93b61 | 202 | if (tb[TCA_FW_CLASSID]) { |
1587bac4 | 203 | f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]); |
1da177e4 LT |
204 | tcf_bind_filter(tp, &f->res, base); |
205 | } | |
206 | ||
207 | #ifdef CONFIG_NET_CLS_IND | |
add93b61 | 208 | if (tb[TCA_FW_INDEV]) { |
2519a602 WC |
209 | int ret; |
210 | ret = tcf_change_indev(net, tb[TCA_FW_INDEV]); | |
722e47d7 WY |
211 | if (ret < 0) { |
212 | err = ret; | |
1da177e4 | 213 | goto errout; |
722e47d7 | 214 | } |
2519a602 | 215 | f->ifindex = ret; |
1da177e4 LT |
216 | } |
217 | #endif /* CONFIG_NET_CLS_IND */ | |
218 | ||
cb95ec62 | 219 | err = -EINVAL; |
add93b61 | 220 | if (tb[TCA_FW_MASK]) { |
1587bac4 | 221 | mask = nla_get_u32(tb[TCA_FW_MASK]); |
b4e9b520 PM |
222 | if (mask != head->mask) |
223 | goto errout; | |
224 | } else if (head->mask != 0xFFFFFFFF) | |
225 | goto errout; | |
226 | ||
1da177e4 LT |
227 | tcf_exts_change(tp, &f->exts, &e); |
228 | ||
229 | return 0; | |
230 | errout: | |
18d0264f | 231 | tcf_exts_destroy(&e); |
1da177e4 LT |
232 | return err; |
233 | } | |
234 | ||
c1b52739 | 235 | static int fw_change(struct net *net, struct sk_buff *in_skb, |
af4c6641 | 236 | struct tcf_proto *tp, unsigned long base, |
1da177e4 | 237 | u32 handle, |
add93b61 | 238 | struct nlattr **tca, |
2f7ef2f8 | 239 | unsigned long *arg, bool ovr) |
1da177e4 | 240 | { |
e35a8ee5 | 241 | struct fw_head *head = rtnl_dereference(tp->root); |
1da177e4 | 242 | struct fw_filter *f = (struct fw_filter *) *arg; |
add93b61 PM |
243 | struct nlattr *opt = tca[TCA_OPTIONS]; |
244 | struct nlattr *tb[TCA_FW_MAX + 1]; | |
1da177e4 LT |
245 | int err; |
246 | ||
247 | if (!opt) | |
248 | return handle ? -EINVAL : 0; | |
249 | ||
6fa8c014 | 250 | err = nla_parse_nested(tb, TCA_FW_MAX, opt, fw_policy); |
cee63723 PM |
251 | if (err < 0) |
252 | return err; | |
1da177e4 | 253 | |
e35a8ee5 JF |
254 | if (f) { |
255 | struct fw_filter *pfp, *fnew; | |
256 | struct fw_filter __rcu **fp; | |
257 | ||
1da177e4 LT |
258 | if (f->id != handle && handle) |
259 | return -EINVAL; | |
e35a8ee5 JF |
260 | |
261 | fnew = kzalloc(sizeof(struct fw_filter), GFP_KERNEL); | |
262 | if (!fnew) | |
263 | return -ENOBUFS; | |
264 | ||
265 | fnew->id = f->id; | |
266 | fnew->res = f->res; | |
267 | #ifdef CONFIG_NET_CLS_IND | |
268 | fnew->ifindex = f->ifindex; | |
269 | #endif /* CONFIG_NET_CLS_IND */ | |
270 | fnew->tp = f->tp; | |
271 | ||
e1f93eb0 JF |
272 | tcf_exts_init(&fnew->exts, TCA_FW_ACT, TCA_FW_POLICE); |
273 | ||
e35a8ee5 JF |
274 | err = fw_change_attrs(net, tp, fnew, tb, tca, base, ovr); |
275 | if (err < 0) { | |
276 | kfree(fnew); | |
277 | return err; | |
278 | } | |
279 | ||
280 | fp = &head->ht[fw_hash(fnew->id)]; | |
281 | for (pfp = rtnl_dereference(*fp); pfp; | |
282 | fp = &pfp->next, pfp = rtnl_dereference(*fp)) | |
283 | if (pfp == f) | |
284 | break; | |
285 | ||
286 | RCU_INIT_POINTER(fnew->next, rtnl_dereference(pfp->next)); | |
287 | rcu_assign_pointer(*fp, fnew); | |
18cdb37e | 288 | tcf_unbind_filter(tp, &f->res); |
e35a8ee5 JF |
289 | call_rcu(&f->rcu, fw_delete_filter); |
290 | ||
291 | *arg = (unsigned long)fnew; | |
292 | return err; | |
1da177e4 LT |
293 | } |
294 | ||
295 | if (!handle) | |
296 | return -EINVAL; | |
297 | ||
33f8b9ec WC |
298 | if (!head->mask_set) { |
299 | head->mask = 0xFFFFFFFF; | |
6fa8c014 | 300 | if (tb[TCA_FW_MASK]) |
33f8b9ec WC |
301 | head->mask = nla_get_u32(tb[TCA_FW_MASK]); |
302 | head->mask_set = true; | |
1da177e4 LT |
303 | } |
304 | ||
0da974f4 | 305 | f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL); |
1da177e4 LT |
306 | if (f == NULL) |
307 | return -ENOBUFS; | |
1da177e4 | 308 | |
5da57f42 | 309 | tcf_exts_init(&f->exts, TCA_FW_ACT, TCA_FW_POLICE); |
1da177e4 | 310 | f->id = handle; |
e35a8ee5 | 311 | f->tp = tp; |
1da177e4 | 312 | |
2f7ef2f8 | 313 | err = fw_change_attrs(net, tp, f, tb, tca, base, ovr); |
1da177e4 LT |
314 | if (err < 0) |
315 | goto errout; | |
316 | ||
e35a8ee5 JF |
317 | RCU_INIT_POINTER(f->next, head->ht[fw_hash(handle)]); |
318 | rcu_assign_pointer(head->ht[fw_hash(handle)], f); | |
1da177e4 LT |
319 | |
320 | *arg = (unsigned long)f; | |
321 | return 0; | |
322 | ||
323 | errout: | |
a51482bd | 324 | kfree(f); |
1da177e4 LT |
325 | return err; |
326 | } | |
327 | ||
328 | static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
329 | { | |
e35a8ee5 | 330 | struct fw_head *head = rtnl_dereference(tp->root); |
1da177e4 LT |
331 | int h; |
332 | ||
333 | if (head == NULL) | |
334 | arg->stop = 1; | |
335 | ||
336 | if (arg->stop) | |
337 | return; | |
338 | ||
c5c13faf | 339 | for (h = 0; h < HTSIZE; h++) { |
1da177e4 LT |
340 | struct fw_filter *f; |
341 | ||
e35a8ee5 JF |
342 | for (f = rtnl_dereference(head->ht[h]); f; |
343 | f = rtnl_dereference(f->next)) { | |
1da177e4 LT |
344 | if (arg->count < arg->skip) { |
345 | arg->count++; | |
346 | continue; | |
347 | } | |
348 | if (arg->fn(tp, (unsigned long)f, arg) < 0) { | |
349 | arg->stop = 1; | |
350 | return; | |
351 | } | |
352 | arg->count++; | |
353 | } | |
354 | } | |
355 | } | |
356 | ||
832d1d5b | 357 | static int fw_dump(struct net *net, struct tcf_proto *tp, unsigned long fh, |
1da177e4 LT |
358 | struct sk_buff *skb, struct tcmsg *t) |
359 | { | |
e35a8ee5 | 360 | struct fw_head *head = rtnl_dereference(tp->root); |
cc7ec456 | 361 | struct fw_filter *f = (struct fw_filter *)fh; |
4b3550ef | 362 | struct nlattr *nest; |
1da177e4 LT |
363 | |
364 | if (f == NULL) | |
365 | return skb->len; | |
366 | ||
367 | t->tcm_handle = f->id; | |
368 | ||
369 | if (!f->res.classid && !tcf_exts_is_available(&f->exts)) | |
370 | return skb->len; | |
371 | ||
4b3550ef PM |
372 | nest = nla_nest_start(skb, TCA_OPTIONS); |
373 | if (nest == NULL) | |
374 | goto nla_put_failure; | |
1da177e4 | 375 | |
1b34ec43 DM |
376 | if (f->res.classid && |
377 | nla_put_u32(skb, TCA_FW_CLASSID, f->res.classid)) | |
378 | goto nla_put_failure; | |
1da177e4 | 379 | #ifdef CONFIG_NET_CLS_IND |
2519a602 WC |
380 | if (f->ifindex) { |
381 | struct net_device *dev; | |
382 | dev = __dev_get_by_index(net, f->ifindex); | |
383 | if (dev && nla_put_string(skb, TCA_FW_INDEV, dev->name)) | |
384 | goto nla_put_failure; | |
385 | } | |
1da177e4 | 386 | #endif /* CONFIG_NET_CLS_IND */ |
1b34ec43 DM |
387 | if (head->mask != 0xFFFFFFFF && |
388 | nla_put_u32(skb, TCA_FW_MASK, head->mask)) | |
389 | goto nla_put_failure; | |
1da177e4 | 390 | |
5da57f42 | 391 | if (tcf_exts_dump(skb, &f->exts) < 0) |
add93b61 | 392 | goto nla_put_failure; |
1da177e4 | 393 | |
4b3550ef | 394 | nla_nest_end(skb, nest); |
1da177e4 | 395 | |
5da57f42 | 396 | if (tcf_exts_dump_stats(skb, &f->exts) < 0) |
add93b61 | 397 | goto nla_put_failure; |
1da177e4 LT |
398 | |
399 | return skb->len; | |
400 | ||
add93b61 | 401 | nla_put_failure: |
6ea3b446 | 402 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
403 | return -1; |
404 | } | |
405 | ||
2eb9d75c | 406 | static struct tcf_proto_ops cls_fw_ops __read_mostly = { |
1da177e4 LT |
407 | .kind = "fw", |
408 | .classify = fw_classify, | |
409 | .init = fw_init, | |
410 | .destroy = fw_destroy, | |
411 | .get = fw_get, | |
1da177e4 LT |
412 | .change = fw_change, |
413 | .delete = fw_delete, | |
414 | .walk = fw_walk, | |
415 | .dump = fw_dump, | |
416 | .owner = THIS_MODULE, | |
417 | }; | |
418 | ||
419 | static int __init init_fw(void) | |
420 | { | |
421 | return register_tcf_proto_ops(&cls_fw_ops); | |
422 | } | |
423 | ||
10297b99 | 424 | static void __exit exit_fw(void) |
1da177e4 LT |
425 | { |
426 | unregister_tcf_proto_ops(&cls_fw_ops); | |
427 | } | |
428 | ||
429 | module_init(init_fw) | |
430 | module_exit(exit_fw) | |
431 | MODULE_LICENSE("GPL"); |