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 inline int fw_hash(u32 handle)
52 return ((handle >> 24) & 0xFFF) ^
53 ((handle >> 12) & 0xFFF) ^
55 else if (HTSIZE == 2048)
56 return ((handle >> 22) & 0x7FF) ^
57 ((handle >> 11) & 0x7FF) ^
59 else if (HTSIZE == 1024)
60 return ((handle >> 20) & 0x3FF) ^
61 ((handle >> 10) & 0x3FF) ^
63 else if (HTSIZE == 512)
64 return (handle >> 27) ^
65 ((handle >> 18) & 0x1FF) ^
66 ((handle >> 9) & 0x1FF) ^
68 else if (HTSIZE == 256) {
69 u8 *t = (u8 *) &handle;
70 return t[0] ^ t[1] ^ t[2] ^ t[3];
72 return handle & (HTSIZE - 1);
75 static int fw_classify(struct sk_buff *skb, const struct tcf_proto *tp,
76 struct tcf_result *res)
78 struct fw_head *head = tp->root;
85 for (f = head->ht[fw_hash(id)]; f; f = f->next) {
88 #ifdef CONFIG_NET_CLS_IND
89 if (!tcf_match_indev(skb, f->ifindex))
91 #endif /* CONFIG_NET_CLS_IND */
92 r = tcf_exts_exec(skb, &f->exts, res);
101 if (id && (TC_H_MAJ(id) == 0 ||
102 !(TC_H_MAJ(id ^ tp->q->handle)))) {
112 static unsigned long fw_get(struct tcf_proto *tp, u32 handle)
114 struct fw_head *head = tp->root;
120 for (f = head->ht[fw_hash(handle)]; f; f = f->next) {
122 return (unsigned long)f;
127 static void fw_put(struct tcf_proto *tp, unsigned long f)
131 static int fw_init(struct tcf_proto *tp)
136 static void fw_delete_filter(struct tcf_proto *tp, struct fw_filter *f)
138 tcf_unbind_filter(tp, &f->res);
139 tcf_exts_destroy(tp, &f->exts);
143 static void fw_destroy(struct tcf_proto *tp)
145 struct fw_head *head = tp->root;
152 for (h = 0; h < HTSIZE; h++) {
153 while ((f = head->ht[h]) != NULL) {
154 head->ht[h] = f->next;
155 fw_delete_filter(tp, f);
161 static int fw_delete(struct tcf_proto *tp, unsigned long arg)
163 struct fw_head *head = tp->root;
164 struct fw_filter *f = (struct fw_filter *)arg;
165 struct fw_filter **fp;
167 if (head == NULL || f == NULL)
170 for (fp = &head->ht[fw_hash(f->id)]; *fp; fp = &(*fp)->next) {
175 fw_delete_filter(tp, f);
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 },
190 fw_change_attrs(struct net *net, struct tcf_proto *tp, struct fw_filter *f,
191 struct nlattr **tb, struct nlattr **tca, unsigned long base)
193 struct fw_head *head = tp->root;
198 tcf_exts_init(&e, TCA_FW_ACT, TCA_FW_POLICE);
199 err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &e);
203 if (tb[TCA_FW_CLASSID]) {
204 f->res.classid = nla_get_u32(tb[TCA_FW_CLASSID]);
205 tcf_bind_filter(tp, &f->res, base);
208 #ifdef CONFIG_NET_CLS_IND
209 if (tb[TCA_FW_INDEV]) {
211 ret = tcf_change_indev(net, tb[TCA_FW_INDEV]);
218 #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 net *net, struct sk_buff *in_skb,
237 struct tcf_proto *tp, unsigned long base,
242 struct fw_head *head = tp->root;
243 struct fw_filter *f = (struct fw_filter *) *arg;
244 struct nlattr *opt = tca[TCA_OPTIONS];
245 struct nlattr *tb[TCA_FW_MAX + 1];
249 return handle ? -EINVAL : 0;
251 err = nla_parse_nested(tb, TCA_FW_MAX, opt, fw_policy);
256 if (f->id != handle && handle)
258 return fw_change_attrs(net, tp, f, tb, tca, base);
265 u32 mask = 0xFFFFFFFF;
267 mask = nla_get_u32(tb[TCA_FW_MASK]);
269 head = kzalloc(sizeof(struct fw_head), GFP_KERNEL);
279 f = kzalloc(sizeof(struct fw_filter), GFP_KERNEL);
283 tcf_exts_init(&f->exts, TCA_FW_ACT, TCA_FW_POLICE);
286 err = fw_change_attrs(net, tp, f, tb, tca, base);
290 f->next = head->ht[fw_hash(handle)];
292 head->ht[fw_hash(handle)] = f;
295 *arg = (unsigned long)f;
303 static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg)
305 struct fw_head *head = tp->root;
314 for (h = 0; h < HTSIZE; h++) {
317 for (f = head->ht[h]; f; f = f->next) {
318 if (arg->count < arg->skip) {
322 if (arg->fn(tp, (unsigned long)f, arg) < 0) {
331 static int fw_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
332 struct sk_buff *skb, struct tcmsg *t)
334 struct fw_head *head = tp->root;
335 struct fw_filter *f = (struct fw_filter *)fh;
336 unsigned char *b = skb_tail_pointer(skb);
342 t->tcm_handle = f->id;
344 if (!f->res.classid && !tcf_exts_is_available(&f->exts))
347 nest = nla_nest_start(skb, TCA_OPTIONS);
349 goto nla_put_failure;
351 if (f->res.classid &&
352 nla_put_u32(skb, TCA_FW_CLASSID, f->res.classid))
353 goto nla_put_failure;
354 #ifdef CONFIG_NET_CLS_IND
356 struct net_device *dev;
357 dev = __dev_get_by_index(net, f->ifindex);
358 if (dev && nla_put_string(skb, TCA_FW_INDEV, dev->name))
359 goto nla_put_failure;
361 #endif /* CONFIG_NET_CLS_IND */
362 if (head->mask != 0xFFFFFFFF &&
363 nla_put_u32(skb, TCA_FW_MASK, head->mask))
364 goto nla_put_failure;
366 if (tcf_exts_dump(skb, &f->exts) < 0)
367 goto nla_put_failure;
369 nla_nest_end(skb, nest);
371 if (tcf_exts_dump_stats(skb, &f->exts) < 0)
372 goto nla_put_failure;
381 static struct tcf_proto_ops cls_fw_ops __read_mostly = {
383 .classify = fw_classify,
385 .destroy = fw_destroy,
392 .owner = THIS_MODULE,
395 static int __init init_fw(void)
397 return register_tcf_proto_ops(&cls_fw_ops);
400 static void __exit exit_fw(void)
402 unregister_tcf_proto_ops(&cls_fw_ops);
407 MODULE_LICENSE("GPL");