2 * net/sched/cls_fw.c Classifier mapping ipchains' fwmark to traffic class.
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.
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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
16 * JHS: We should remove the CONFIG_NET_CLS_IND from here
17 * eventually when the meta match extension is made available
21 #include <linux/module.h>
22 #include <linux/slab.h>
23 #include <linux/types.h>
24 #include <linux/kernel.h>
25 #include <linux/string.h>
26 #include <linux/errno.h>
27 #include <linux/skbuff.h>
28 #include <net/netlink.h>
29 #include <net/act_api.h>
30 #include <net/pkt_cls.h>
32 #define HTSIZE (PAGE_SIZE/sizeof(struct fw_filter *))
35 struct fw_filter *ht[HTSIZE];
40 struct fw_filter *next;
42 struct tcf_result res;
43 #ifdef CONFIG_NET_CLS_IND
45 #endif /* CONFIG_NET_CLS_IND */
49 static const struct tcf_ext_map fw_ext_map = {
51 .police = TCA_FW_POLICE
54 static inline int fw_hash(u32 handle)
57 return ((handle >> 24) & 0xFFF) ^
58 ((handle >> 12) & 0xFFF) ^
60 else if (HTSIZE == 2048)
61 return ((handle >> 22) & 0x7FF) ^
62 ((handle >> 11) & 0x7FF) ^
64 else if (HTSIZE == 1024)
65 return ((handle >> 20) & 0x3FF) ^
66 ((handle >> 10) & 0x3FF) ^
68 else if (HTSIZE == 512)
69 return (handle >> 27) ^
70 ((handle >> 18) & 0x1FF) ^
71 ((handle >> 9) & 0x1FF) ^
73 else if (HTSIZE == 256) {
74 u8 *t = (u8 *) &handle;
75 return t[0] ^ t[1] ^ t[2] ^ t[3];
77 return handle & (HTSIZE - 1);
80 static int fw_classify(struct sk_buff *skb, const struct tcf_proto *tp,
81 struct tcf_result *res)
83 struct fw_head *head = (struct fw_head *)tp->root;
90 for (f = head->ht[fw_hash(id)]; f; f = f->next) {
93 #ifdef CONFIG_NET_CLS_IND
94 if (!tcf_match_indev(skb, f->indev))
96 #endif /* CONFIG_NET_CLS_IND */
97 r = tcf_exts_exec(skb, &f->exts, res);
106 if (id && (TC_H_MAJ(id) == 0 ||
107 !(TC_H_MAJ(id ^ tp->q->handle)))) {
117 static unsigned long fw_get(struct tcf_proto *tp, u32 handle)
119 struct fw_head *head = (struct fw_head *)tp->root;
125 for (f = head->ht[fw_hash(handle)]; f; f = f->next) {
127 return (unsigned long)f;
132 static void fw_put(struct tcf_proto *tp, unsigned long f)
136 static int fw_init(struct tcf_proto *tp)
141 static void fw_delete_filter(struct tcf_proto *tp, struct fw_filter *f)
143 tcf_unbind_filter(tp, &f->res);
144 tcf_exts_destroy(tp, &f->exts);
148 static void fw_destroy(struct tcf_proto *tp)
150 struct fw_head *head = tp->root;
157 for (h = 0; h < HTSIZE; h++) {
158 while ((f = head->ht[h]) != NULL) {
159 head->ht[h] = f->next;
160 fw_delete_filter(tp, f);
166 static int fw_delete(struct tcf_proto *tp, unsigned long arg)
168 struct fw_head *head = (struct fw_head *)tp->root;
169 struct fw_filter *f = (struct fw_filter *)arg;
170 struct fw_filter **fp;
172 if (head == NULL || f == NULL)
175 for (fp = &head->ht[fw_hash(f->id)]; *fp; fp = &(*fp)->next) {
180 fw_delete_filter(tp, f);
188 static const struct nla_policy fw_policy[TCA_FW_MAX + 1] = {
189 [TCA_FW_CLASSID] = { .type = NLA_U32 },
190 [TCA_FW_INDEV] = { .type = NLA_STRING, .len = IFNAMSIZ },
191 [TCA_FW_MASK] = { .type = NLA_U32 },
195 fw_change_attrs(struct tcf_proto *tp, struct fw_filter *f,
196 struct nlattr **tb, struct nlattr **tca, unsigned long base)
198 struct fw_head *head = (struct fw_head *)tp->root;
203 err = tcf_exts_validate(tp, tb, tca[TCA_RATE], &e, &fw_ext_map);
208 if (tb[TCA_FW_CLASSID]) {
209 f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]);
210 tcf_bind_filter(tp, &f->res, base);
213 #ifdef CONFIG_NET_CLS_IND
214 if (tb[TCA_FW_INDEV]) {
215 err = tcf_change_indev(tp, f->indev, tb[TCA_FW_INDEV]);
219 #endif /* CONFIG_NET_CLS_IND */
221 if (tb[TCA_FW_MASK]) {
222 mask = nla_get_u32(tb[TCA_FW_MASK]);
223 if (mask != head->mask)
225 } else if (head->mask != 0xFFFFFFFF)
228 tcf_exts_change(tp, &f->exts, &e);
232 tcf_exts_destroy(tp, &e);
236 static int fw_change(struct tcf_proto *tp, unsigned long base,
241 struct fw_head *head = (struct fw_head *)tp->root;
242 struct fw_filter *f = (struct fw_filter *) *arg;
243 struct nlattr *opt = tca[TCA_OPTIONS];
244 struct nlattr *tb[TCA_FW_MAX + 1];
248 return handle ? -EINVAL : 0;
250 err = nla_parse_nested(tb, TCA_FW_MAX, opt, fw_policy);
255 if (f->id != handle && handle)
257 return fw_change_attrs(tp, f, tb, tca, base);
264 u32 mask = 0xFFFFFFFF;
266 mask = nla_get_u32(tb[TCA_FW_MASK]);
268 head = kzalloc(sizeof(struct fw_head), GFP_KERNEL);
278 f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
284 err = fw_change_attrs(tp, f, tb, tca, base);
288 f->next = head->ht[fw_hash(handle)];
290 head->ht[fw_hash(handle)] = f;
293 *arg = (unsigned long)f;
301 static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg)
303 struct fw_head *head = (struct fw_head *)tp->root;
312 for (h = 0; h < HTSIZE; h++) {
315 for (f = head->ht[h]; f; f = f->next) {
316 if (arg->count < arg->skip) {
320 if (arg->fn(tp, (unsigned long)f, arg) < 0) {
329 static int fw_dump(struct tcf_proto *tp, unsigned long fh,
330 struct sk_buff *skb, struct tcmsg *t)
332 struct fw_head *head = (struct fw_head *)tp->root;
333 struct fw_filter *f = (struct fw_filter *)fh;
334 unsigned char *b = skb_tail_pointer(skb);
340 t->tcm_handle = f->id;
342 if (!f->res.classid && !tcf_exts_is_available(&f->exts))
345 nest = nla_nest_start(skb, TCA_OPTIONS);
347 goto nla_put_failure;
350 NLA_PUT_U32(skb, TCA_FW_CLASSID, f->res.classid);
351 #ifdef CONFIG_NET_CLS_IND
352 if (strlen(f->indev))
353 NLA_PUT_STRING(skb, TCA_FW_INDEV, f->indev);
354 #endif /* CONFIG_NET_CLS_IND */
355 if (head->mask != 0xFFFFFFFF)
356 NLA_PUT_U32(skb, TCA_FW_MASK, head->mask);
358 if (tcf_exts_dump(skb, &f->exts, &fw_ext_map) < 0)
359 goto nla_put_failure;
361 nla_nest_end(skb, nest);
363 if (tcf_exts_dump_stats(skb, &f->exts, &fw_ext_map) < 0)
364 goto nla_put_failure;
373 static struct tcf_proto_ops cls_fw_ops __read_mostly = {
375 .classify = fw_classify,
377 .destroy = fw_destroy,
384 .owner = THIS_MODULE,
387 static int __init init_fw(void)
389 return register_tcf_proto_ops(&cls_fw_ops);
392 static void __exit exit_fw(void)
394 unregister_tcf_proto_ops(&cls_fw_ops);
399 MODULE_LICENSE("GPL");