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 ED |
35 | u32 mask; |
36 | struct fw_filter *ht[HTSIZE]; | |
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 | |
2519a602 | 44 | int ifindex; |
1da177e4 LT |
45 | #endif /* CONFIG_NET_CLS_IND */ |
46 | struct tcf_exts exts; | |
47 | }; | |
48 | ||
d37d8ac1 | 49 | static u32 fw_hash(u32 handle) |
1da177e4 | 50 | { |
d37d8ac1 ED |
51 | handle ^= (handle >> 16); |
52 | handle ^= (handle >> 8); | |
53 | return handle % HTSIZE; | |
1da177e4 LT |
54 | } |
55 | ||
dc7f9f6e | 56 | static int fw_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
1da177e4 LT |
57 | struct tcf_result *res) |
58 | { | |
a8701a6c | 59 | struct fw_head *head = tp->root; |
1da177e4 LT |
60 | struct fw_filter *f; |
61 | int r; | |
5c804bfd | 62 | u32 id = skb->mark; |
1da177e4 LT |
63 | |
64 | if (head != NULL) { | |
5c804bfd | 65 | id &= head->mask; |
cc7ec456 | 66 | for (f = head->ht[fw_hash(id)]; f; f = f->next) { |
1da177e4 LT |
67 | if (f->id == id) { |
68 | *res = f->res; | |
69 | #ifdef CONFIG_NET_CLS_IND | |
2519a602 | 70 | if (!tcf_match_indev(skb, f->ifindex)) |
1da177e4 LT |
71 | continue; |
72 | #endif /* CONFIG_NET_CLS_IND */ | |
73 | r = tcf_exts_exec(skb, &f->exts, res); | |
74 | if (r < 0) | |
75 | continue; | |
76 | ||
77 | return r; | |
78 | } | |
79 | } | |
80 | } else { | |
81 | /* old method */ | |
cc7ec456 ED |
82 | if (id && (TC_H_MAJ(id) == 0 || |
83 | !(TC_H_MAJ(id ^ tp->q->handle)))) { | |
1da177e4 LT |
84 | res->classid = id; |
85 | res->class = 0; | |
86 | return 0; | |
87 | } | |
88 | } | |
89 | ||
90 | return -1; | |
91 | } | |
92 | ||
93 | static unsigned long fw_get(struct tcf_proto *tp, u32 handle) | |
94 | { | |
a8701a6c | 95 | struct fw_head *head = tp->root; |
1da177e4 LT |
96 | struct fw_filter *f; |
97 | ||
98 | if (head == NULL) | |
99 | return 0; | |
100 | ||
cc7ec456 | 101 | for (f = head->ht[fw_hash(handle)]; f; f = f->next) { |
1da177e4 LT |
102 | if (f->id == handle) |
103 | return (unsigned long)f; | |
104 | } | |
105 | return 0; | |
106 | } | |
107 | ||
108 | static void fw_put(struct tcf_proto *tp, unsigned long f) | |
109 | { | |
110 | } | |
111 | ||
112 | static int fw_init(struct tcf_proto *tp) | |
113 | { | |
114 | return 0; | |
115 | } | |
116 | ||
cc7ec456 | 117 | static void fw_delete_filter(struct tcf_proto *tp, struct fw_filter *f) |
1da177e4 LT |
118 | { |
119 | tcf_unbind_filter(tp, &f->res); | |
120 | tcf_exts_destroy(tp, &f->exts); | |
121 | kfree(f); | |
122 | } | |
123 | ||
124 | static void fw_destroy(struct tcf_proto *tp) | |
125 | { | |
47a1a1d4 | 126 | struct fw_head *head = tp->root; |
1da177e4 LT |
127 | struct fw_filter *f; |
128 | int h; | |
129 | ||
130 | if (head == NULL) | |
131 | return; | |
132 | ||
cc7ec456 ED |
133 | for (h = 0; h < HTSIZE; h++) { |
134 | while ((f = head->ht[h]) != NULL) { | |
1da177e4 LT |
135 | head->ht[h] = f->next; |
136 | fw_delete_filter(tp, f); | |
137 | } | |
138 | } | |
139 | kfree(head); | |
140 | } | |
141 | ||
142 | static int fw_delete(struct tcf_proto *tp, unsigned long arg) | |
143 | { | |
a8701a6c | 144 | struct fw_head *head = tp->root; |
cc7ec456 | 145 | struct fw_filter *f = (struct fw_filter *)arg; |
1da177e4 LT |
146 | struct fw_filter **fp; |
147 | ||
148 | if (head == NULL || f == NULL) | |
149 | goto out; | |
150 | ||
cc7ec456 | 151 | for (fp = &head->ht[fw_hash(f->id)]; *fp; fp = &(*fp)->next) { |
1da177e4 LT |
152 | if (*fp == f) { |
153 | tcf_tree_lock(tp); | |
154 | *fp = f->next; | |
155 | tcf_tree_unlock(tp); | |
156 | fw_delete_filter(tp, f); | |
157 | return 0; | |
158 | } | |
159 | } | |
160 | out: | |
161 | return -EINVAL; | |
162 | } | |
163 | ||
6fa8c014 PM |
164 | static const struct nla_policy fw_policy[TCA_FW_MAX + 1] = { |
165 | [TCA_FW_CLASSID] = { .type = NLA_U32 }, | |
166 | [TCA_FW_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ }, | |
167 | [TCA_FW_MASK] = { .type = NLA_U32 }, | |
168 | }; | |
169 | ||
1da177e4 | 170 | static int |
c1b52739 | 171 | fw_change_attrs(struct net *net, struct tcf_proto *tp, struct fw_filter *f, |
2f7ef2f8 | 172 | struct nlattr **tb, struct nlattr **tca, unsigned long base, bool ovr) |
1da177e4 | 173 | { |
a8701a6c | 174 | struct fw_head *head = tp->root; |
1da177e4 | 175 | struct tcf_exts e; |
b4e9b520 | 176 | u32 mask; |
1da177e4 LT |
177 | int err; |
178 | ||
5da57f42 | 179 | tcf_exts_init(&e, TCA_FW_ACT, TCA_FW_POLICE); |
2f7ef2f8 | 180 | err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &e, ovr); |
1da177e4 LT |
181 | if (err < 0) |
182 | return err; | |
183 | ||
add93b61 | 184 | if (tb[TCA_FW_CLASSID]) { |
1587bac4 | 185 | f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]); |
1da177e4 LT |
186 | tcf_bind_filter(tp, &f->res, base); |
187 | } | |
188 | ||
189 | #ifdef CONFIG_NET_CLS_IND | |
add93b61 | 190 | if (tb[TCA_FW_INDEV]) { |
2519a602 WC |
191 | int ret; |
192 | ret = tcf_change_indev(net, tb[TCA_FW_INDEV]); | |
722e47d7 WY |
193 | if (ret < 0) { |
194 | err = ret; | |
1da177e4 | 195 | goto errout; |
722e47d7 | 196 | } |
2519a602 | 197 | f->ifindex = ret; |
1da177e4 LT |
198 | } |
199 | #endif /* CONFIG_NET_CLS_IND */ | |
200 | ||
cb95ec62 | 201 | err = -EINVAL; |
add93b61 | 202 | if (tb[TCA_FW_MASK]) { |
1587bac4 | 203 | mask = nla_get_u32(tb[TCA_FW_MASK]); |
b4e9b520 PM |
204 | if (mask != head->mask) |
205 | goto errout; | |
206 | } else if (head->mask != 0xFFFFFFFF) | |
207 | goto errout; | |
208 | ||
1da177e4 LT |
209 | tcf_exts_change(tp, &f->exts, &e); |
210 | ||
211 | return 0; | |
212 | errout: | |
213 | tcf_exts_destroy(tp, &e); | |
214 | return err; | |
215 | } | |
216 | ||
c1b52739 | 217 | static int fw_change(struct net *net, struct sk_buff *in_skb, |
af4c6641 | 218 | struct tcf_proto *tp, unsigned long base, |
1da177e4 | 219 | u32 handle, |
add93b61 | 220 | struct nlattr **tca, |
2f7ef2f8 | 221 | unsigned long *arg, bool ovr) |
1da177e4 | 222 | { |
a8701a6c | 223 | struct fw_head *head = tp->root; |
1da177e4 | 224 | struct fw_filter *f = (struct fw_filter *) *arg; |
add93b61 PM |
225 | struct nlattr *opt = tca[TCA_OPTIONS]; |
226 | struct nlattr *tb[TCA_FW_MAX + 1]; | |
1da177e4 LT |
227 | int err; |
228 | ||
229 | if (!opt) | |
230 | return handle ? -EINVAL : 0; | |
231 | ||
6fa8c014 | 232 | err = nla_parse_nested(tb, TCA_FW_MAX, opt, fw_policy); |
cee63723 PM |
233 | if (err < 0) |
234 | return err; | |
1da177e4 LT |
235 | |
236 | if (f != NULL) { | |
237 | if (f->id != handle && handle) | |
238 | return -EINVAL; | |
2f7ef2f8 | 239 | return fw_change_attrs(net, tp, f, tb, tca, base, ovr); |
1da177e4 LT |
240 | } |
241 | ||
242 | if (!handle) | |
243 | return -EINVAL; | |
244 | ||
245 | if (head == NULL) { | |
b4e9b520 | 246 | u32 mask = 0xFFFFFFFF; |
6fa8c014 | 247 | if (tb[TCA_FW_MASK]) |
1587bac4 | 248 | mask = nla_get_u32(tb[TCA_FW_MASK]); |
b4e9b520 | 249 | |
0da974f4 | 250 | head = kzalloc(sizeof(struct fw_head), GFP_KERNEL); |
1da177e4 LT |
251 | if (head == NULL) |
252 | return -ENOBUFS; | |
b4e9b520 | 253 | head->mask = mask; |
1da177e4 LT |
254 | |
255 | tcf_tree_lock(tp); | |
256 | tp->root = head; | |
257 | tcf_tree_unlock(tp); | |
258 | } | |
259 | ||
0da974f4 | 260 | f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL); |
1da177e4 LT |
261 | if (f == NULL) |
262 | return -ENOBUFS; | |
1da177e4 | 263 | |
5da57f42 | 264 | tcf_exts_init(&f->exts, TCA_FW_ACT, TCA_FW_POLICE); |
1da177e4 LT |
265 | f->id = handle; |
266 | ||
2f7ef2f8 | 267 | err = fw_change_attrs(net, tp, f, tb, tca, base, ovr); |
1da177e4 LT |
268 | if (err < 0) |
269 | goto errout; | |
270 | ||
271 | f->next = head->ht[fw_hash(handle)]; | |
272 | tcf_tree_lock(tp); | |
273 | head->ht[fw_hash(handle)] = f; | |
274 | tcf_tree_unlock(tp); | |
275 | ||
276 | *arg = (unsigned long)f; | |
277 | return 0; | |
278 | ||
279 | errout: | |
a51482bd | 280 | kfree(f); |
1da177e4 LT |
281 | return err; |
282 | } | |
283 | ||
284 | static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg) | |
285 | { | |
a8701a6c | 286 | struct fw_head *head = tp->root; |
1da177e4 LT |
287 | int h; |
288 | ||
289 | if (head == NULL) | |
290 | arg->stop = 1; | |
291 | ||
292 | if (arg->stop) | |
293 | return; | |
294 | ||
c5c13faf | 295 | for (h = 0; h < HTSIZE; h++) { |
1da177e4 LT |
296 | struct fw_filter *f; |
297 | ||
298 | for (f = head->ht[h]; f; f = f->next) { | |
299 | if (arg->count < arg->skip) { | |
300 | arg->count++; | |
301 | continue; | |
302 | } | |
303 | if (arg->fn(tp, (unsigned long)f, arg) < 0) { | |
304 | arg->stop = 1; | |
305 | return; | |
306 | } | |
307 | arg->count++; | |
308 | } | |
309 | } | |
310 | } | |
311 | ||
832d1d5b | 312 | static int fw_dump(struct net *net, struct tcf_proto *tp, unsigned long fh, |
1da177e4 LT |
313 | struct sk_buff *skb, struct tcmsg *t) |
314 | { | |
a8701a6c | 315 | struct fw_head *head = tp->root; |
cc7ec456 | 316 | struct fw_filter *f = (struct fw_filter *)fh; |
27a884dc | 317 | unsigned char *b = skb_tail_pointer(skb); |
4b3550ef | 318 | struct nlattr *nest; |
1da177e4 LT |
319 | |
320 | if (f == NULL) | |
321 | return skb->len; | |
322 | ||
323 | t->tcm_handle = f->id; | |
324 | ||
325 | if (!f->res.classid && !tcf_exts_is_available(&f->exts)) | |
326 | return skb->len; | |
327 | ||
4b3550ef PM |
328 | nest = nla_nest_start(skb, TCA_OPTIONS); |
329 | if (nest == NULL) | |
330 | goto nla_put_failure; | |
1da177e4 | 331 | |
1b34ec43 DM |
332 | if (f->res.classid && |
333 | nla_put_u32(skb, TCA_FW_CLASSID, f->res.classid)) | |
334 | goto nla_put_failure; | |
1da177e4 | 335 | #ifdef CONFIG_NET_CLS_IND |
2519a602 WC |
336 | if (f->ifindex) { |
337 | struct net_device *dev; | |
338 | dev = __dev_get_by_index(net, f->ifindex); | |
339 | if (dev && nla_put_string(skb, TCA_FW_INDEV, dev->name)) | |
340 | goto nla_put_failure; | |
341 | } | |
1da177e4 | 342 | #endif /* CONFIG_NET_CLS_IND */ |
1b34ec43 DM |
343 | if (head->mask != 0xFFFFFFFF && |
344 | nla_put_u32(skb, TCA_FW_MASK, head->mask)) | |
345 | goto nla_put_failure; | |
1da177e4 | 346 | |
5da57f42 | 347 | if (tcf_exts_dump(skb, &f->exts) < 0) |
add93b61 | 348 | goto nla_put_failure; |
1da177e4 | 349 | |
4b3550ef | 350 | nla_nest_end(skb, nest); |
1da177e4 | 351 | |
5da57f42 | 352 | if (tcf_exts_dump_stats(skb, &f->exts) < 0) |
add93b61 | 353 | goto nla_put_failure; |
1da177e4 LT |
354 | |
355 | return skb->len; | |
356 | ||
add93b61 | 357 | nla_put_failure: |
dc5fc579 | 358 | nlmsg_trim(skb, b); |
1da177e4 LT |
359 | return -1; |
360 | } | |
361 | ||
2eb9d75c | 362 | static struct tcf_proto_ops cls_fw_ops __read_mostly = { |
1da177e4 LT |
363 | .kind = "fw", |
364 | .classify = fw_classify, | |
365 | .init = fw_init, | |
366 | .destroy = fw_destroy, | |
367 | .get = fw_get, | |
368 | .put = fw_put, | |
369 | .change = fw_change, | |
370 | .delete = fw_delete, | |
371 | .walk = fw_walk, | |
372 | .dump = fw_dump, | |
373 | .owner = THIS_MODULE, | |
374 | }; | |
375 | ||
376 | static int __init init_fw(void) | |
377 | { | |
378 | return register_tcf_proto_ops(&cls_fw_ops); | |
379 | } | |
380 | ||
10297b99 | 381 | static void __exit exit_fw(void) |
1da177e4 LT |
382 | { |
383 | unregister_tcf_proto_ops(&cls_fw_ops); | |
384 | } | |
385 | ||
386 | module_init(init_fw) | |
387 | module_exit(exit_fw) | |
388 | MODULE_LICENSE("GPL"); |