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 | ||
c5c13faf TG |
32 | #define HTSIZE (PAGE_SIZE/sizeof(struct fw_filter *)) |
33 | ||
cc7ec456 | 34 | struct fw_head { |
c5c13faf | 35 | struct fw_filter *ht[HTSIZE]; |
b4e9b520 | 36 | u32 mask; |
1da177e4 LT |
37 | }; |
38 | ||
cc7ec456 | 39 | struct fw_filter { |
1da177e4 LT |
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 | ||
cc7ec456 | 49 | static inline int fw_hash(u32 handle) |
1da177e4 | 50 | { |
c5c13faf TG |
51 | if (HTSIZE == 4096) |
52 | return ((handle >> 24) & 0xFFF) ^ | |
53 | ((handle >> 12) & 0xFFF) ^ | |
54 | (handle & 0xFFF); | |
55 | else if (HTSIZE == 2048) | |
56 | return ((handle >> 22) & 0x7FF) ^ | |
57 | ((handle >> 11) & 0x7FF) ^ | |
58 | (handle & 0x7FF); | |
59 | else if (HTSIZE == 1024) | |
60 | return ((handle >> 20) & 0x3FF) ^ | |
61 | ((handle >> 10) & 0x3FF) ^ | |
62 | (handle & 0x3FF); | |
63 | else if (HTSIZE == 512) | |
64 | return (handle >> 27) ^ | |
65 | ((handle >> 18) & 0x1FF) ^ | |
66 | ((handle >> 9) & 0x1FF) ^ | |
67 | (handle & 0x1FF); | |
68 | else if (HTSIZE == 256) { | |
69 | u8 *t = (u8 *) &handle; | |
70 | return t[0] ^ t[1] ^ t[2] ^ t[3]; | |
10297b99 | 71 | } else |
c5c13faf | 72 | return handle & (HTSIZE - 1); |
1da177e4 LT |
73 | } |
74 | ||
dc7f9f6e | 75 | static int fw_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
1da177e4 LT |
76 | struct tcf_result *res) |
77 | { | |
cc7ec456 | 78 | struct fw_head *head = (struct fw_head *)tp->root; |
1da177e4 LT |
79 | struct fw_filter *f; |
80 | int r; | |
5c804bfd | 81 | u32 id = skb->mark; |
1da177e4 LT |
82 | |
83 | if (head != NULL) { | |
5c804bfd | 84 | id &= head->mask; |
cc7ec456 | 85 | for (f = head->ht[fw_hash(id)]; f; f = f->next) { |
1da177e4 LT |
86 | if (f->id == id) { |
87 | *res = f->res; | |
88 | #ifdef CONFIG_NET_CLS_IND | |
89 | if (!tcf_match_indev(skb, f->indev)) | |
90 | continue; | |
91 | #endif /* CONFIG_NET_CLS_IND */ | |
92 | r = tcf_exts_exec(skb, &f->exts, res); | |
93 | if (r < 0) | |
94 | continue; | |
95 | ||
96 | return r; | |
97 | } | |
98 | } | |
99 | } else { | |
100 | /* old method */ | |
cc7ec456 ED |
101 | if (id && (TC_H_MAJ(id) == 0 || |
102 | !(TC_H_MAJ(id ^ tp->q->handle)))) { | |
1da177e4 LT |
103 | res->classid = id; |
104 | res->class = 0; | |
105 | return 0; | |
106 | } | |
107 | } | |
108 | ||
109 | return -1; | |
110 | } | |
111 | ||
112 | static unsigned long fw_get(struct tcf_proto *tp, u32 handle) | |
113 | { | |
cc7ec456 | 114 | struct fw_head *head = (struct fw_head *)tp->root; |
1da177e4 LT |
115 | struct fw_filter *f; |
116 | ||
117 | if (head == NULL) | |
118 | return 0; | |
119 | ||
cc7ec456 | 120 | for (f = head->ht[fw_hash(handle)]; f; f = f->next) { |
1da177e4 LT |
121 | if (f->id == handle) |
122 | return (unsigned long)f; | |
123 | } | |
124 | return 0; | |
125 | } | |
126 | ||
127 | static void fw_put(struct tcf_proto *tp, unsigned long f) | |
128 | { | |
129 | } | |
130 | ||
131 | static int fw_init(struct tcf_proto *tp) | |
132 | { | |
133 | return 0; | |
134 | } | |
135 | ||
cc7ec456 | 136 | static void fw_delete_filter(struct tcf_proto *tp, struct fw_filter *f) |
1da177e4 LT |
137 | { |
138 | tcf_unbind_filter(tp, &f->res); | |
139 | tcf_exts_destroy(tp, &f->exts); | |
140 | kfree(f); | |
141 | } | |
142 | ||
143 | static void fw_destroy(struct tcf_proto *tp) | |
144 | { | |
47a1a1d4 | 145 | struct fw_head *head = tp->root; |
1da177e4 LT |
146 | struct fw_filter *f; |
147 | int h; | |
148 | ||
149 | if (head == NULL) | |
150 | return; | |
151 | ||
cc7ec456 ED |
152 | for (h = 0; h < HTSIZE; h++) { |
153 | while ((f = head->ht[h]) != NULL) { | |
1da177e4 LT |
154 | head->ht[h] = f->next; |
155 | fw_delete_filter(tp, f); | |
156 | } | |
157 | } | |
158 | kfree(head); | |
159 | } | |
160 | ||
161 | static int fw_delete(struct tcf_proto *tp, unsigned long arg) | |
162 | { | |
cc7ec456 ED |
163 | struct fw_head *head = (struct fw_head *)tp->root; |
164 | struct fw_filter *f = (struct fw_filter *)arg; | |
1da177e4 LT |
165 | struct fw_filter **fp; |
166 | ||
167 | if (head == NULL || f == NULL) | |
168 | goto out; | |
169 | ||
cc7ec456 | 170 | for (fp = &head->ht[fw_hash(f->id)]; *fp; fp = &(*fp)->next) { |
1da177e4 LT |
171 | if (*fp == f) { |
172 | tcf_tree_lock(tp); | |
173 | *fp = f->next; | |
174 | tcf_tree_unlock(tp); | |
175 | fw_delete_filter(tp, f); | |
176 | return 0; | |
177 | } | |
178 | } | |
179 | out: | |
180 | return -EINVAL; | |
181 | } | |
182 | ||
6fa8c014 PM |
183 | static 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 | ||
1da177e4 | 189 | static int |
c1b52739 | 190 | fw_change_attrs(struct net *net, struct tcf_proto *tp, struct fw_filter *f, |
add93b61 | 191 | struct nlattr **tb, struct nlattr **tca, unsigned long base) |
1da177e4 | 192 | { |
b4e9b520 | 193 | struct fw_head *head = (struct fw_head *)tp->root; |
1da177e4 | 194 | struct tcf_exts e; |
b4e9b520 | 195 | u32 mask; |
1da177e4 LT |
196 | int err; |
197 | ||
5da57f42 WC |
198 | tcf_exts_init(&e, TCA_FW_ACT, TCA_FW_POLICE); |
199 | err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &e); | |
1da177e4 LT |
200 | if (err < 0) |
201 | return err; | |
202 | ||
add93b61 | 203 | if (tb[TCA_FW_CLASSID]) { |
1587bac4 | 204 | f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]); |
1da177e4 LT |
205 | tcf_bind_filter(tp, &f->res, base); |
206 | } | |
207 | ||
208 | #ifdef CONFIG_NET_CLS_IND | |
add93b61 PM |
209 | if (tb[TCA_FW_INDEV]) { |
210 | err = tcf_change_indev(tp, f->indev, tb[TCA_FW_INDEV]); | |
1da177e4 LT |
211 | if (err < 0) |
212 | goto errout; | |
213 | } | |
214 | #endif /* CONFIG_NET_CLS_IND */ | |
215 | ||
cb95ec62 | 216 | err = -EINVAL; |
add93b61 | 217 | if (tb[TCA_FW_MASK]) { |
1587bac4 | 218 | mask = nla_get_u32(tb[TCA_FW_MASK]); |
b4e9b520 PM |
219 | if (mask != head->mask) |
220 | goto errout; | |
221 | } else if (head->mask != 0xFFFFFFFF) | |
222 | goto errout; | |
223 | ||
1da177e4 LT |
224 | tcf_exts_change(tp, &f->exts, &e); |
225 | ||
226 | return 0; | |
227 | errout: | |
228 | tcf_exts_destroy(tp, &e); | |
229 | return err; | |
230 | } | |
231 | ||
c1b52739 | 232 | static int fw_change(struct net *net, struct sk_buff *in_skb, |
af4c6641 | 233 | struct tcf_proto *tp, unsigned long base, |
1da177e4 | 234 | u32 handle, |
add93b61 | 235 | struct nlattr **tca, |
1da177e4 LT |
236 | unsigned long *arg) |
237 | { | |
cc7ec456 | 238 | struct fw_head *head = (struct fw_head *)tp->root; |
1da177e4 | 239 | struct fw_filter *f = (struct fw_filter *) *arg; |
add93b61 PM |
240 | struct nlattr *opt = tca[TCA_OPTIONS]; |
241 | struct nlattr *tb[TCA_FW_MAX + 1]; | |
1da177e4 LT |
242 | int err; |
243 | ||
244 | if (!opt) | |
245 | return handle ? -EINVAL : 0; | |
246 | ||
6fa8c014 | 247 | err = nla_parse_nested(tb, TCA_FW_MAX, opt, fw_policy); |
cee63723 PM |
248 | if (err < 0) |
249 | return err; | |
1da177e4 LT |
250 | |
251 | if (f != NULL) { | |
252 | if (f->id != handle && handle) | |
253 | return -EINVAL; | |
c1b52739 | 254 | return fw_change_attrs(net, tp, f, tb, tca, base); |
1da177e4 LT |
255 | } |
256 | ||
257 | if (!handle) | |
258 | return -EINVAL; | |
259 | ||
260 | if (head == NULL) { | |
b4e9b520 | 261 | u32 mask = 0xFFFFFFFF; |
6fa8c014 | 262 | if (tb[TCA_FW_MASK]) |
1587bac4 | 263 | mask = nla_get_u32(tb[TCA_FW_MASK]); |
b4e9b520 | 264 | |
0da974f4 | 265 | head = kzalloc(sizeof(struct fw_head), GFP_KERNEL); |
1da177e4 LT |
266 | if (head == NULL) |
267 | return -ENOBUFS; | |
b4e9b520 | 268 | head->mask = mask; |
1da177e4 LT |
269 | |
270 | tcf_tree_lock(tp); | |
271 | tp->root = head; | |
272 | tcf_tree_unlock(tp); | |
273 | } | |
274 | ||
0da974f4 | 275 | f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL); |
1da177e4 LT |
276 | if (f == NULL) |
277 | return -ENOBUFS; | |
1da177e4 | 278 | |
5da57f42 | 279 | tcf_exts_init(&f->exts, TCA_FW_ACT, TCA_FW_POLICE); |
1da177e4 LT |
280 | f->id = handle; |
281 | ||
c1b52739 | 282 | err = fw_change_attrs(net, tp, f, tb, tca, base); |
1da177e4 LT |
283 | if (err < 0) |
284 | goto errout; | |
285 | ||
286 | f->next = head->ht[fw_hash(handle)]; | |
287 | tcf_tree_lock(tp); | |
288 | head->ht[fw_hash(handle)] = f; | |
289 | tcf_tree_unlock(tp); | |
290 | ||
291 | *arg = (unsigned long)f; | |
292 | return 0; | |
293 | ||
294 | errout: | |
a51482bd | 295 | kfree(f); |
1da177e4 LT |
296 | return err; |
297 | } | |
298 | ||
299 | static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
300 | { | |
cc7ec456 | 301 | struct fw_head *head = (struct fw_head *)tp->root; |
1da177e4 LT |
302 | int h; |
303 | ||
304 | if (head == NULL) | |
305 | arg->stop = 1; | |
306 | ||
307 | if (arg->stop) | |
308 | return; | |
309 | ||
c5c13faf | 310 | for (h = 0; h < HTSIZE; h++) { |
1da177e4 LT |
311 | struct fw_filter *f; |
312 | ||
313 | for (f = head->ht[h]; f; f = f->next) { | |
314 | if (arg->count < arg->skip) { | |
315 | arg->count++; | |
316 | continue; | |
317 | } | |
318 | if (arg->fn(tp, (unsigned long)f, arg) < 0) { | |
319 | arg->stop = 1; | |
320 | return; | |
321 | } | |
322 | arg->count++; | |
323 | } | |
324 | } | |
325 | } | |
326 | ||
327 | static int fw_dump(struct tcf_proto *tp, unsigned long fh, | |
328 | struct sk_buff *skb, struct tcmsg *t) | |
329 | { | |
b4e9b520 | 330 | struct fw_head *head = (struct fw_head *)tp->root; |
cc7ec456 | 331 | struct fw_filter *f = (struct fw_filter *)fh; |
27a884dc | 332 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 333 | struct nlattr *nest; |
1da177e4 LT |
334 | |
335 | if (f == NULL) | |
336 | return skb->len; | |
337 | ||
338 | t->tcm_handle = f->id; | |
339 | ||
340 | if (!f->res.classid && !tcf_exts_is_available(&f->exts)) | |
341 | return skb->len; | |
342 | ||
4b3550ef PM |
343 | nest = nla_nest_start(skb, TCA_OPTIONS); |
344 | if (nest == NULL) | |
345 | goto nla_put_failure; | |
1da177e4 | 346 | |
1b34ec43 DM |
347 | if (f->res.classid && |
348 | nla_put_u32(skb, TCA_FW_CLASSID, f->res.classid)) | |
349 | goto nla_put_failure; | |
1da177e4 | 350 | #ifdef CONFIG_NET_CLS_IND |
1b34ec43 DM |
351 | if (strlen(f->indev) && |
352 | nla_put_string(skb, TCA_FW_INDEV, f->indev)) | |
353 | goto nla_put_failure; | |
1da177e4 | 354 | #endif /* CONFIG_NET_CLS_IND */ |
1b34ec43 DM |
355 | if (head->mask != 0xFFFFFFFF && |
356 | nla_put_u32(skb, TCA_FW_MASK, head->mask)) | |
357 | goto nla_put_failure; | |
1da177e4 | 358 | |
5da57f42 | 359 | if (tcf_exts_dump(skb, &f->exts) < 0) |
add93b61 | 360 | goto nla_put_failure; |
1da177e4 | 361 | |
4b3550ef | 362 | nla_nest_end(skb, nest); |
1da177e4 | 363 | |
5da57f42 | 364 | if (tcf_exts_dump_stats(skb, &f->exts) < 0) |
add93b61 | 365 | goto nla_put_failure; |
1da177e4 LT |
366 | |
367 | return skb->len; | |
368 | ||
add93b61 | 369 | nla_put_failure: |
dc5fc579 | 370 | nlmsg_trim(skb, b); |
1da177e4 LT |
371 | return -1; |
372 | } | |
373 | ||
2eb9d75c | 374 | static struct tcf_proto_ops cls_fw_ops __read_mostly = { |
1da177e4 LT |
375 | .kind = "fw", |
376 | .classify = fw_classify, | |
377 | .init = fw_init, | |
378 | .destroy = fw_destroy, | |
379 | .get = fw_get, | |
380 | .put = fw_put, | |
381 | .change = fw_change, | |
382 | .delete = fw_delete, | |
383 | .walk = fw_walk, | |
384 | .dump = fw_dump, | |
385 | .owner = THIS_MODULE, | |
386 | }; | |
387 | ||
388 | static int __init init_fw(void) | |
389 | { | |
390 | return register_tcf_proto_ops(&cls_fw_ops); | |
391 | } | |
392 | ||
10297b99 | 393 | static void __exit exit_fw(void) |
1da177e4 LT |
394 | { |
395 | unregister_tcf_proto_ops(&cls_fw_ops); | |
396 | } | |
397 | ||
398 | module_init(init_fw) | |
399 | module_exit(exit_fw) | |
400 | MODULE_LICENSE("GPL"); |