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; |
e35a8ee5 JF |
36 | struct fw_filter __rcu *ht[HTSIZE]; |
37 | struct rcu_head rcu; | |
1da177e4 LT |
38 | }; |
39 | ||
cc7ec456 | 40 | struct fw_filter { |
e35a8ee5 | 41 | struct fw_filter __rcu *next; |
1da177e4 LT |
42 | u32 id; |
43 | struct tcf_result res; | |
44 | #ifdef CONFIG_NET_CLS_IND | |
2519a602 | 45 | int ifindex; |
1da177e4 LT |
46 | #endif /* CONFIG_NET_CLS_IND */ |
47 | struct tcf_exts exts; | |
e35a8ee5 JF |
48 | struct tcf_proto *tp; |
49 | struct rcu_head rcu; | |
1da177e4 LT |
50 | }; |
51 | ||
d37d8ac1 | 52 | static u32 fw_hash(u32 handle) |
1da177e4 | 53 | { |
d37d8ac1 ED |
54 | handle ^= (handle >> 16); |
55 | handle ^= (handle >> 8); | |
56 | return handle % HTSIZE; | |
1da177e4 LT |
57 | } |
58 | ||
dc7f9f6e | 59 | static int fw_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
5a7a5555 | 60 | struct tcf_result *res) |
1da177e4 | 61 | { |
e35a8ee5 | 62 | struct fw_head *head = rcu_dereference_bh(tp->root); |
1da177e4 LT |
63 | struct fw_filter *f; |
64 | int r; | |
5c804bfd | 65 | u32 id = skb->mark; |
1da177e4 LT |
66 | |
67 | if (head != NULL) { | |
5c804bfd | 68 | id &= head->mask; |
e35a8ee5 JF |
69 | |
70 | for (f = rcu_dereference_bh(head->ht[fw_hash(id)]); f; | |
71 | f = rcu_dereference_bh(f->next)) { | |
1da177e4 LT |
72 | if (f->id == id) { |
73 | *res = f->res; | |
74 | #ifdef CONFIG_NET_CLS_IND | |
2519a602 | 75 | if (!tcf_match_indev(skb, f->ifindex)) |
1da177e4 LT |
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 { | |
d8aecb10 | 86 | /* Old method: classify the packet using its skb mark. */ |
cc7ec456 ED |
87 | if (id && (TC_H_MAJ(id) == 0 || |
88 | !(TC_H_MAJ(id ^ tp->q->handle)))) { | |
1da177e4 LT |
89 | res->classid = id; |
90 | res->class = 0; | |
91 | return 0; | |
92 | } | |
93 | } | |
94 | ||
95 | return -1; | |
96 | } | |
97 | ||
8113c095 | 98 | static void *fw_get(struct tcf_proto *tp, u32 handle) |
1da177e4 | 99 | { |
e35a8ee5 | 100 | struct fw_head *head = rtnl_dereference(tp->root); |
1da177e4 LT |
101 | struct fw_filter *f; |
102 | ||
103 | if (head == NULL) | |
8113c095 | 104 | return NULL; |
1da177e4 | 105 | |
e35a8ee5 JF |
106 | f = rtnl_dereference(head->ht[fw_hash(handle)]); |
107 | for (; f; f = rtnl_dereference(f->next)) { | |
1da177e4 | 108 | if (f->id == handle) |
8113c095 | 109 | return f; |
1da177e4 | 110 | } |
8113c095 | 111 | return NULL; |
1da177e4 LT |
112 | } |
113 | ||
1da177e4 LT |
114 | static int fw_init(struct tcf_proto *tp) |
115 | { | |
d8aecb10 WC |
116 | /* We don't allocate fw_head here, because in the old method |
117 | * we don't need it at all. | |
118 | */ | |
1da177e4 LT |
119 | return 0; |
120 | } | |
121 | ||
e35a8ee5 | 122 | static void fw_delete_filter(struct rcu_head *head) |
1da177e4 | 123 | { |
e35a8ee5 | 124 | struct fw_filter *f = container_of(head, struct fw_filter, rcu); |
e35a8ee5 | 125 | |
18d0264f | 126 | tcf_exts_destroy(&f->exts); |
1da177e4 LT |
127 | kfree(f); |
128 | } | |
129 | ||
763dbf63 | 130 | static void fw_destroy(struct tcf_proto *tp) |
1da177e4 | 131 | { |
e35a8ee5 | 132 | struct fw_head *head = rtnl_dereference(tp->root); |
1da177e4 LT |
133 | struct fw_filter *f; |
134 | int h; | |
135 | ||
136 | if (head == NULL) | |
763dbf63 | 137 | return; |
1da177e4 | 138 | |
cc7ec456 | 139 | for (h = 0; h < HTSIZE; h++) { |
e35a8ee5 JF |
140 | while ((f = rtnl_dereference(head->ht[h])) != NULL) { |
141 | RCU_INIT_POINTER(head->ht[h], | |
142 | rtnl_dereference(f->next)); | |
18cdb37e | 143 | tcf_unbind_filter(tp, &f->res); |
e35a8ee5 | 144 | call_rcu(&f->rcu, fw_delete_filter); |
1da177e4 LT |
145 | } |
146 | } | |
e35a8ee5 | 147 | kfree_rcu(head, rcu); |
1da177e4 LT |
148 | } |
149 | ||
8113c095 | 150 | static int fw_delete(struct tcf_proto *tp, void *arg, bool *last) |
1da177e4 | 151 | { |
e35a8ee5 | 152 | struct fw_head *head = rtnl_dereference(tp->root); |
8113c095 | 153 | struct fw_filter *f = arg; |
e35a8ee5 JF |
154 | struct fw_filter __rcu **fp; |
155 | struct fw_filter *pfp; | |
763dbf63 WC |
156 | int ret = -EINVAL; |
157 | int h; | |
1da177e4 LT |
158 | |
159 | if (head == NULL || f == NULL) | |
160 | goto out; | |
161 | ||
e35a8ee5 JF |
162 | fp = &head->ht[fw_hash(f->id)]; |
163 | ||
164 | for (pfp = rtnl_dereference(*fp); pfp; | |
165 | fp = &pfp->next, pfp = rtnl_dereference(*fp)) { | |
166 | if (pfp == f) { | |
167 | RCU_INIT_POINTER(*fp, rtnl_dereference(f->next)); | |
18cdb37e | 168 | tcf_unbind_filter(tp, &f->res); |
e35a8ee5 | 169 | call_rcu(&f->rcu, fw_delete_filter); |
763dbf63 WC |
170 | ret = 0; |
171 | break; | |
1da177e4 LT |
172 | } |
173 | } | |
763dbf63 WC |
174 | |
175 | *last = true; | |
176 | for (h = 0; h < HTSIZE; h++) { | |
177 | if (rcu_access_pointer(head->ht[h])) { | |
178 | *last = false; | |
179 | break; | |
180 | } | |
181 | } | |
182 | ||
1da177e4 | 183 | out: |
763dbf63 | 184 | return ret; |
1da177e4 LT |
185 | } |
186 | ||
6fa8c014 PM |
187 | static const struct nla_policy fw_policy[TCA_FW_MAX + 1] = { |
188 | [TCA_FW_CLASSID] = { .type = NLA_U32 }, | |
189 | [TCA_FW_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ }, | |
190 | [TCA_FW_MASK] = { .type = NLA_U32 }, | |
191 | }; | |
192 | ||
1e5003af JP |
193 | static int fw_set_parms(struct net *net, struct tcf_proto *tp, |
194 | struct fw_filter *f, struct nlattr **tb, | |
195 | struct nlattr **tca, unsigned long base, bool ovr) | |
1da177e4 | 196 | { |
e35a8ee5 | 197 | struct fw_head *head = rtnl_dereference(tp->root); |
b4e9b520 | 198 | u32 mask; |
1da177e4 LT |
199 | int err; |
200 | ||
94611bff | 201 | err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &f->exts, ovr); |
1da177e4 LT |
202 | if (err < 0) |
203 | return err; | |
204 | ||
add93b61 | 205 | if (tb[TCA_FW_CLASSID]) { |
1587bac4 | 206 | f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]); |
1da177e4 LT |
207 | tcf_bind_filter(tp, &f->res, base); |
208 | } | |
209 | ||
210 | #ifdef CONFIG_NET_CLS_IND | |
add93b61 | 211 | if (tb[TCA_FW_INDEV]) { |
2519a602 WC |
212 | int ret; |
213 | ret = tcf_change_indev(net, tb[TCA_FW_INDEV]); | |
94611bff JP |
214 | if (ret < 0) |
215 | return ret; | |
2519a602 | 216 | f->ifindex = ret; |
1da177e4 LT |
217 | } |
218 | #endif /* CONFIG_NET_CLS_IND */ | |
219 | ||
cb95ec62 | 220 | err = -EINVAL; |
add93b61 | 221 | if (tb[TCA_FW_MASK]) { |
1587bac4 | 222 | mask = nla_get_u32(tb[TCA_FW_MASK]); |
b4e9b520 | 223 | if (mask != head->mask) |
94611bff | 224 | return err; |
b4e9b520 | 225 | } else if (head->mask != 0xFFFFFFFF) |
94611bff | 226 | return err; |
1da177e4 LT |
227 | |
228 | return 0; | |
1da177e4 LT |
229 | } |
230 | ||
c1b52739 | 231 | static int fw_change(struct net *net, struct sk_buff *in_skb, |
af4c6641 | 232 | struct tcf_proto *tp, unsigned long base, |
8113c095 | 233 | u32 handle, struct nlattr **tca, void **arg, |
5a7a5555 | 234 | bool ovr) |
1da177e4 | 235 | { |
e35a8ee5 | 236 | struct fw_head *head = rtnl_dereference(tp->root); |
8113c095 | 237 | struct fw_filter *f = *arg; |
add93b61 PM |
238 | struct nlattr *opt = tca[TCA_OPTIONS]; |
239 | struct nlattr *tb[TCA_FW_MAX + 1]; | |
1da177e4 LT |
240 | int err; |
241 | ||
242 | if (!opt) | |
d8aecb10 | 243 | return handle ? -EINVAL : 0; /* Succeed if it is old method. */ |
1da177e4 | 244 | |
fceb6435 | 245 | err = nla_parse_nested(tb, TCA_FW_MAX, opt, fw_policy, NULL); |
cee63723 PM |
246 | if (err < 0) |
247 | return err; | |
1da177e4 | 248 | |
e35a8ee5 JF |
249 | if (f) { |
250 | struct fw_filter *pfp, *fnew; | |
251 | struct fw_filter __rcu **fp; | |
252 | ||
1da177e4 LT |
253 | if (f->id != handle && handle) |
254 | return -EINVAL; | |
e35a8ee5 JF |
255 | |
256 | fnew = kzalloc(sizeof(struct fw_filter), GFP_KERNEL); | |
257 | if (!fnew) | |
258 | return -ENOBUFS; | |
259 | ||
260 | fnew->id = f->id; | |
261 | fnew->res = f->res; | |
262 | #ifdef CONFIG_NET_CLS_IND | |
263 | fnew->ifindex = f->ifindex; | |
264 | #endif /* CONFIG_NET_CLS_IND */ | |
265 | fnew->tp = f->tp; | |
266 | ||
b9a24bb7 WC |
267 | err = tcf_exts_init(&fnew->exts, TCA_FW_ACT, TCA_FW_POLICE); |
268 | if (err < 0) { | |
269 | kfree(fnew); | |
270 | return err; | |
271 | } | |
e1f93eb0 | 272 | |
1e5003af | 273 | err = fw_set_parms(net, tp, fnew, tb, tca, base, ovr); |
e35a8ee5 | 274 | if (err < 0) { |
b9a24bb7 | 275 | tcf_exts_destroy(&fnew->exts); |
e35a8ee5 JF |
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 | ||
8113c095 | 291 | *arg = fnew; |
e35a8ee5 | 292 | return err; |
1da177e4 LT |
293 | } |
294 | ||
295 | if (!handle) | |
296 | return -EINVAL; | |
297 | ||
d8aecb10 WC |
298 | if (!head) { |
299 | u32 mask = 0xFFFFFFFF; | |
6fa8c014 | 300 | if (tb[TCA_FW_MASK]) |
d8aecb10 WC |
301 | mask = nla_get_u32(tb[TCA_FW_MASK]); |
302 | ||
303 | head = kzalloc(sizeof(*head), GFP_KERNEL); | |
304 | if (!head) | |
305 | return -ENOBUFS; | |
306 | head->mask = mask; | |
307 | ||
308 | rcu_assign_pointer(tp->root, head); | |
1da177e4 LT |
309 | } |
310 | ||
0da974f4 | 311 | f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL); |
1da177e4 LT |
312 | if (f == NULL) |
313 | return -ENOBUFS; | |
1da177e4 | 314 | |
b9a24bb7 WC |
315 | err = tcf_exts_init(&f->exts, TCA_FW_ACT, TCA_FW_POLICE); |
316 | if (err < 0) | |
317 | goto errout; | |
1da177e4 | 318 | f->id = handle; |
e35a8ee5 | 319 | f->tp = tp; |
1da177e4 | 320 | |
1e5003af | 321 | err = fw_set_parms(net, tp, f, tb, tca, base, ovr); |
1da177e4 LT |
322 | if (err < 0) |
323 | goto errout; | |
324 | ||
e35a8ee5 JF |
325 | RCU_INIT_POINTER(f->next, head->ht[fw_hash(handle)]); |
326 | rcu_assign_pointer(head->ht[fw_hash(handle)], f); | |
1da177e4 | 327 | |
8113c095 | 328 | *arg = f; |
1da177e4 LT |
329 | return 0; |
330 | ||
331 | errout: | |
b9a24bb7 | 332 | tcf_exts_destroy(&f->exts); |
a51482bd | 333 | kfree(f); |
1da177e4 LT |
334 | return err; |
335 | } | |
336 | ||
337 | static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
338 | { | |
e35a8ee5 | 339 | struct fw_head *head = rtnl_dereference(tp->root); |
1da177e4 LT |
340 | int h; |
341 | ||
342 | if (head == NULL) | |
343 | arg->stop = 1; | |
344 | ||
345 | if (arg->stop) | |
346 | return; | |
347 | ||
c5c13faf | 348 | for (h = 0; h < HTSIZE; h++) { |
1da177e4 LT |
349 | struct fw_filter *f; |
350 | ||
e35a8ee5 JF |
351 | for (f = rtnl_dereference(head->ht[h]); f; |
352 | f = rtnl_dereference(f->next)) { | |
1da177e4 LT |
353 | if (arg->count < arg->skip) { |
354 | arg->count++; | |
355 | continue; | |
356 | } | |
8113c095 | 357 | if (arg->fn(tp, f, arg) < 0) { |
1da177e4 LT |
358 | arg->stop = 1; |
359 | return; | |
360 | } | |
361 | arg->count++; | |
362 | } | |
363 | } | |
364 | } | |
365 | ||
8113c095 | 366 | static int fw_dump(struct net *net, struct tcf_proto *tp, void *fh, |
1da177e4 LT |
367 | struct sk_buff *skb, struct tcmsg *t) |
368 | { | |
e35a8ee5 | 369 | struct fw_head *head = rtnl_dereference(tp->root); |
8113c095 | 370 | struct fw_filter *f = fh; |
4b3550ef | 371 | struct nlattr *nest; |
1da177e4 LT |
372 | |
373 | if (f == NULL) | |
374 | return skb->len; | |
375 | ||
376 | t->tcm_handle = f->id; | |
377 | ||
6fc6d06e | 378 | if (!f->res.classid && !tcf_exts_has_actions(&f->exts)) |
1da177e4 LT |
379 | return skb->len; |
380 | ||
4b3550ef PM |
381 | nest = nla_nest_start(skb, TCA_OPTIONS); |
382 | if (nest == NULL) | |
383 | goto nla_put_failure; | |
1da177e4 | 384 | |
1b34ec43 DM |
385 | if (f->res.classid && |
386 | nla_put_u32(skb, TCA_FW_CLASSID, f->res.classid)) | |
387 | goto nla_put_failure; | |
1da177e4 | 388 | #ifdef CONFIG_NET_CLS_IND |
2519a602 WC |
389 | if (f->ifindex) { |
390 | struct net_device *dev; | |
391 | dev = __dev_get_by_index(net, f->ifindex); | |
392 | if (dev && nla_put_string(skb, TCA_FW_INDEV, dev->name)) | |
393 | goto nla_put_failure; | |
394 | } | |
1da177e4 | 395 | #endif /* CONFIG_NET_CLS_IND */ |
1b34ec43 DM |
396 | if (head->mask != 0xFFFFFFFF && |
397 | nla_put_u32(skb, TCA_FW_MASK, head->mask)) | |
398 | goto nla_put_failure; | |
1da177e4 | 399 | |
5da57f42 | 400 | if (tcf_exts_dump(skb, &f->exts) < 0) |
add93b61 | 401 | goto nla_put_failure; |
1da177e4 | 402 | |
4b3550ef | 403 | nla_nest_end(skb, nest); |
1da177e4 | 404 | |
5da57f42 | 405 | if (tcf_exts_dump_stats(skb, &f->exts) < 0) |
add93b61 | 406 | goto nla_put_failure; |
1da177e4 LT |
407 | |
408 | return skb->len; | |
409 | ||
add93b61 | 410 | nla_put_failure: |
6ea3b446 | 411 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
412 | return -1; |
413 | } | |
414 | ||
07d79fc7 CW |
415 | static void fw_bind_class(void *fh, u32 classid, unsigned long cl) |
416 | { | |
417 | struct fw_filter *f = fh; | |
418 | ||
419 | if (f && f->res.classid == classid) | |
420 | f->res.class = cl; | |
421 | } | |
422 | ||
2eb9d75c | 423 | static struct tcf_proto_ops cls_fw_ops __read_mostly = { |
1da177e4 LT |
424 | .kind = "fw", |
425 | .classify = fw_classify, | |
426 | .init = fw_init, | |
427 | .destroy = fw_destroy, | |
428 | .get = fw_get, | |
1da177e4 LT |
429 | .change = fw_change, |
430 | .delete = fw_delete, | |
431 | .walk = fw_walk, | |
432 | .dump = fw_dump, | |
07d79fc7 | 433 | .bind_class = fw_bind_class, |
1da177e4 LT |
434 | .owner = THIS_MODULE, |
435 | }; | |
436 | ||
437 | static int __init init_fw(void) | |
438 | { | |
439 | return register_tcf_proto_ops(&cls_fw_ops); | |
440 | } | |
441 | ||
10297b99 | 442 | static void __exit exit_fw(void) |
1da177e4 LT |
443 | { |
444 | unregister_tcf_proto_ops(&cls_fw_ops); | |
445 | } | |
446 | ||
447 | module_init(init_fw) | |
448 | module_exit(exit_fw) | |
449 | MODULE_LICENSE("GPL"); |