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Commit | Line | Data |
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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 | ||
98 | static unsigned long fw_get(struct tcf_proto *tp, u32 handle) | |
99 | { | |
e35a8ee5 | 100 | struct fw_head *head = rtnl_dereference(tp->root); |
1da177e4 LT |
101 | struct fw_filter *f; |
102 | ||
103 | if (head == NULL) | |
104 | return 0; | |
105 | ||
e35a8ee5 JF |
106 | f = rtnl_dereference(head->ht[fw_hash(handle)]); |
107 | for (; f; f = rtnl_dereference(f->next)) { | |
1da177e4 LT |
108 | if (f->id == handle) |
109 | return (unsigned long)f; | |
110 | } | |
111 | return 0; | |
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 | ||
763dbf63 | 150 | static int fw_delete(struct tcf_proto *tp, unsigned long arg, bool *last) |
1da177e4 | 151 | { |
e35a8ee5 | 152 | struct fw_head *head = rtnl_dereference(tp->root); |
cc7ec456 | 153 | struct fw_filter *f = (struct fw_filter *)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 | ||
1da177e4 | 193 | static int |
c1b52739 | 194 | fw_change_attrs(struct net *net, struct tcf_proto *tp, struct fw_filter *f, |
5a7a5555 JHS |
195 | struct nlattr **tb, struct nlattr **tca, unsigned long base, |
196 | bool ovr) | |
1da177e4 | 197 | { |
e35a8ee5 | 198 | struct fw_head *head = rtnl_dereference(tp->root); |
1da177e4 | 199 | struct tcf_exts e; |
b4e9b520 | 200 | u32 mask; |
1da177e4 LT |
201 | int err; |
202 | ||
b9a24bb7 | 203 | err = tcf_exts_init(&e, TCA_FW_ACT, TCA_FW_POLICE); |
1da177e4 LT |
204 | if (err < 0) |
205 | return err; | |
b9a24bb7 WC |
206 | err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &e, ovr); |
207 | if (err < 0) | |
208 | goto errout; | |
1da177e4 | 209 | |
add93b61 | 210 | if (tb[TCA_FW_CLASSID]) { |
1587bac4 | 211 | f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]); |
1da177e4 LT |
212 | tcf_bind_filter(tp, &f->res, base); |
213 | } | |
214 | ||
215 | #ifdef CONFIG_NET_CLS_IND | |
add93b61 | 216 | if (tb[TCA_FW_INDEV]) { |
2519a602 WC |
217 | int ret; |
218 | ret = tcf_change_indev(net, tb[TCA_FW_INDEV]); | |
722e47d7 WY |
219 | if (ret < 0) { |
220 | err = ret; | |
1da177e4 | 221 | goto errout; |
722e47d7 | 222 | } |
2519a602 | 223 | f->ifindex = ret; |
1da177e4 LT |
224 | } |
225 | #endif /* CONFIG_NET_CLS_IND */ | |
226 | ||
cb95ec62 | 227 | err = -EINVAL; |
add93b61 | 228 | if (tb[TCA_FW_MASK]) { |
1587bac4 | 229 | mask = nla_get_u32(tb[TCA_FW_MASK]); |
b4e9b520 PM |
230 | if (mask != head->mask) |
231 | goto errout; | |
232 | } else if (head->mask != 0xFFFFFFFF) | |
233 | goto errout; | |
234 | ||
1da177e4 LT |
235 | tcf_exts_change(tp, &f->exts, &e); |
236 | ||
237 | return 0; | |
238 | errout: | |
18d0264f | 239 | tcf_exts_destroy(&e); |
1da177e4 LT |
240 | return err; |
241 | } | |
242 | ||
c1b52739 | 243 | static int fw_change(struct net *net, struct sk_buff *in_skb, |
af4c6641 | 244 | struct tcf_proto *tp, unsigned long base, |
5a7a5555 JHS |
245 | u32 handle, struct nlattr **tca, unsigned long *arg, |
246 | bool ovr) | |
1da177e4 | 247 | { |
e35a8ee5 | 248 | struct fw_head *head = rtnl_dereference(tp->root); |
1da177e4 | 249 | struct fw_filter *f = (struct fw_filter *) *arg; |
add93b61 PM |
250 | struct nlattr *opt = tca[TCA_OPTIONS]; |
251 | struct nlattr *tb[TCA_FW_MAX + 1]; | |
1da177e4 LT |
252 | int err; |
253 | ||
254 | if (!opt) | |
d8aecb10 | 255 | return handle ? -EINVAL : 0; /* Succeed if it is old method. */ |
1da177e4 | 256 | |
fceb6435 | 257 | err = nla_parse_nested(tb, TCA_FW_MAX, opt, fw_policy, NULL); |
cee63723 PM |
258 | if (err < 0) |
259 | return err; | |
1da177e4 | 260 | |
e35a8ee5 JF |
261 | if (f) { |
262 | struct fw_filter *pfp, *fnew; | |
263 | struct fw_filter __rcu **fp; | |
264 | ||
1da177e4 LT |
265 | if (f->id != handle && handle) |
266 | return -EINVAL; | |
e35a8ee5 JF |
267 | |
268 | fnew = kzalloc(sizeof(struct fw_filter), GFP_KERNEL); | |
269 | if (!fnew) | |
270 | return -ENOBUFS; | |
271 | ||
272 | fnew->id = f->id; | |
273 | fnew->res = f->res; | |
274 | #ifdef CONFIG_NET_CLS_IND | |
275 | fnew->ifindex = f->ifindex; | |
276 | #endif /* CONFIG_NET_CLS_IND */ | |
277 | fnew->tp = f->tp; | |
278 | ||
b9a24bb7 WC |
279 | err = tcf_exts_init(&fnew->exts, TCA_FW_ACT, TCA_FW_POLICE); |
280 | if (err < 0) { | |
281 | kfree(fnew); | |
282 | return err; | |
283 | } | |
e1f93eb0 | 284 | |
e35a8ee5 JF |
285 | err = fw_change_attrs(net, tp, fnew, tb, tca, base, ovr); |
286 | if (err < 0) { | |
b9a24bb7 | 287 | tcf_exts_destroy(&fnew->exts); |
e35a8ee5 JF |
288 | kfree(fnew); |
289 | return err; | |
290 | } | |
291 | ||
292 | fp = &head->ht[fw_hash(fnew->id)]; | |
293 | for (pfp = rtnl_dereference(*fp); pfp; | |
294 | fp = &pfp->next, pfp = rtnl_dereference(*fp)) | |
295 | if (pfp == f) | |
296 | break; | |
297 | ||
298 | RCU_INIT_POINTER(fnew->next, rtnl_dereference(pfp->next)); | |
299 | rcu_assign_pointer(*fp, fnew); | |
18cdb37e | 300 | tcf_unbind_filter(tp, &f->res); |
e35a8ee5 JF |
301 | call_rcu(&f->rcu, fw_delete_filter); |
302 | ||
303 | *arg = (unsigned long)fnew; | |
304 | return err; | |
1da177e4 LT |
305 | } |
306 | ||
307 | if (!handle) | |
308 | return -EINVAL; | |
309 | ||
d8aecb10 WC |
310 | if (!head) { |
311 | u32 mask = 0xFFFFFFFF; | |
6fa8c014 | 312 | if (tb[TCA_FW_MASK]) |
d8aecb10 WC |
313 | mask = nla_get_u32(tb[TCA_FW_MASK]); |
314 | ||
315 | head = kzalloc(sizeof(*head), GFP_KERNEL); | |
316 | if (!head) | |
317 | return -ENOBUFS; | |
318 | head->mask = mask; | |
319 | ||
320 | rcu_assign_pointer(tp->root, head); | |
1da177e4 LT |
321 | } |
322 | ||
0da974f4 | 323 | f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL); |
1da177e4 LT |
324 | if (f == NULL) |
325 | return -ENOBUFS; | |
1da177e4 | 326 | |
b9a24bb7 WC |
327 | err = tcf_exts_init(&f->exts, TCA_FW_ACT, TCA_FW_POLICE); |
328 | if (err < 0) | |
329 | goto errout; | |
1da177e4 | 330 | f->id = handle; |
e35a8ee5 | 331 | f->tp = tp; |
1da177e4 | 332 | |
2f7ef2f8 | 333 | err = fw_change_attrs(net, tp, f, tb, tca, base, ovr); |
1da177e4 LT |
334 | if (err < 0) |
335 | goto errout; | |
336 | ||
e35a8ee5 JF |
337 | RCU_INIT_POINTER(f->next, head->ht[fw_hash(handle)]); |
338 | rcu_assign_pointer(head->ht[fw_hash(handle)], f); | |
1da177e4 LT |
339 | |
340 | *arg = (unsigned long)f; | |
341 | return 0; | |
342 | ||
343 | errout: | |
b9a24bb7 | 344 | tcf_exts_destroy(&f->exts); |
a51482bd | 345 | kfree(f); |
1da177e4 LT |
346 | return err; |
347 | } | |
348 | ||
349 | static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
350 | { | |
e35a8ee5 | 351 | struct fw_head *head = rtnl_dereference(tp->root); |
1da177e4 LT |
352 | int h; |
353 | ||
354 | if (head == NULL) | |
355 | arg->stop = 1; | |
356 | ||
357 | if (arg->stop) | |
358 | return; | |
359 | ||
c5c13faf | 360 | for (h = 0; h < HTSIZE; h++) { |
1da177e4 LT |
361 | struct fw_filter *f; |
362 | ||
e35a8ee5 JF |
363 | for (f = rtnl_dereference(head->ht[h]); f; |
364 | f = rtnl_dereference(f->next)) { | |
1da177e4 LT |
365 | if (arg->count < arg->skip) { |
366 | arg->count++; | |
367 | continue; | |
368 | } | |
369 | if (arg->fn(tp, (unsigned long)f, arg) < 0) { | |
370 | arg->stop = 1; | |
371 | return; | |
372 | } | |
373 | arg->count++; | |
374 | } | |
375 | } | |
376 | } | |
377 | ||
832d1d5b | 378 | static int fw_dump(struct net *net, struct tcf_proto *tp, unsigned long fh, |
1da177e4 LT |
379 | struct sk_buff *skb, struct tcmsg *t) |
380 | { | |
e35a8ee5 | 381 | struct fw_head *head = rtnl_dereference(tp->root); |
cc7ec456 | 382 | struct fw_filter *f = (struct fw_filter *)fh; |
4b3550ef | 383 | struct nlattr *nest; |
1da177e4 LT |
384 | |
385 | if (f == NULL) | |
386 | return skb->len; | |
387 | ||
388 | t->tcm_handle = f->id; | |
389 | ||
390 | if (!f->res.classid && !tcf_exts_is_available(&f->exts)) | |
391 | return skb->len; | |
392 | ||
4b3550ef PM |
393 | nest = nla_nest_start(skb, TCA_OPTIONS); |
394 | if (nest == NULL) | |
395 | goto nla_put_failure; | |
1da177e4 | 396 | |
1b34ec43 DM |
397 | if (f->res.classid && |
398 | nla_put_u32(skb, TCA_FW_CLASSID, f->res.classid)) | |
399 | goto nla_put_failure; | |
1da177e4 | 400 | #ifdef CONFIG_NET_CLS_IND |
2519a602 WC |
401 | if (f->ifindex) { |
402 | struct net_device *dev; | |
403 | dev = __dev_get_by_index(net, f->ifindex); | |
404 | if (dev && nla_put_string(skb, TCA_FW_INDEV, dev->name)) | |
405 | goto nla_put_failure; | |
406 | } | |
1da177e4 | 407 | #endif /* CONFIG_NET_CLS_IND */ |
1b34ec43 DM |
408 | if (head->mask != 0xFFFFFFFF && |
409 | nla_put_u32(skb, TCA_FW_MASK, head->mask)) | |
410 | goto nla_put_failure; | |
1da177e4 | 411 | |
5da57f42 | 412 | if (tcf_exts_dump(skb, &f->exts) < 0) |
add93b61 | 413 | goto nla_put_failure; |
1da177e4 | 414 | |
4b3550ef | 415 | nla_nest_end(skb, nest); |
1da177e4 | 416 | |
5da57f42 | 417 | if (tcf_exts_dump_stats(skb, &f->exts) < 0) |
add93b61 | 418 | goto nla_put_failure; |
1da177e4 LT |
419 | |
420 | return skb->len; | |
421 | ||
add93b61 | 422 | nla_put_failure: |
6ea3b446 | 423 | nla_nest_cancel(skb, nest); |
1da177e4 LT |
424 | return -1; |
425 | } | |
426 | ||
2eb9d75c | 427 | static struct tcf_proto_ops cls_fw_ops __read_mostly = { |
1da177e4 LT |
428 | .kind = "fw", |
429 | .classify = fw_classify, | |
430 | .init = fw_init, | |
431 | .destroy = fw_destroy, | |
432 | .get = fw_get, | |
1da177e4 LT |
433 | .change = fw_change, |
434 | .delete = fw_delete, | |
435 | .walk = fw_walk, | |
436 | .dump = fw_dump, | |
437 | .owner = THIS_MODULE, | |
438 | }; | |
439 | ||
440 | static int __init init_fw(void) | |
441 | { | |
442 | return register_tcf_proto_ops(&cls_fw_ops); | |
443 | } | |
444 | ||
10297b99 | 445 | static void __exit exit_fw(void) |
1da177e4 LT |
446 | { |
447 | unregister_tcf_proto_ops(&cls_fw_ops); | |
448 | } | |
449 | ||
450 | module_init(init_fw) | |
451 | module_exit(exit_fw) | |
452 | MODULE_LICENSE("GPL"); |