2 * net/sched/cls_basic.c Basic Packet Classifier.
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: Thomas Graf <tgraf@suug.ch>
12 #include <linux/module.h>
13 #include <linux/types.h>
14 #include <linux/kernel.h>
15 #include <linux/string.h>
17 #include <linux/errno.h>
18 #include <linux/rtnetlink.h>
19 #include <linux/skbuff.h>
20 #include <net/act_api.h>
21 #include <net/pkt_cls.h>
26 struct list_head flist
;
33 struct tcf_ematch_tree ematches
;
34 struct tcf_result res
;
35 struct list_head link
;
38 static struct tcf_ext_map basic_ext_map
= {
39 .action
= TCA_BASIC_ACT
,
40 .police
= TCA_BASIC_POLICE
43 static int basic_classify(struct sk_buff
*skb
, struct tcf_proto
*tp
,
44 struct tcf_result
*res
)
47 struct basic_head
*head
= (struct basic_head
*) tp
->root
;
48 struct basic_filter
*f
;
50 list_for_each_entry(f
, &head
->flist
, link
) {
51 if (!tcf_em_tree_match(skb
, &f
->ematches
, NULL
))
54 r
= tcf_exts_exec(skb
, &f
->exts
, res
);
62 static unsigned long basic_get(struct tcf_proto
*tp
, u32 handle
)
64 unsigned long l
= 0UL;
65 struct basic_head
*head
= (struct basic_head
*) tp
->root
;
66 struct basic_filter
*f
;
71 list_for_each_entry(f
, &head
->flist
, link
)
72 if (f
->handle
== handle
)
73 l
= (unsigned long) f
;
78 static void basic_put(struct tcf_proto
*tp
, unsigned long f
)
82 static int basic_init(struct tcf_proto
*tp
)
84 struct basic_head
*head
;
86 head
= kzalloc(sizeof(*head
), GFP_KERNEL
);
89 INIT_LIST_HEAD(&head
->flist
);
94 static inline void basic_delete_filter(struct tcf_proto
*tp
,
95 struct basic_filter
*f
)
97 tcf_unbind_filter(tp
, &f
->res
);
98 tcf_exts_destroy(tp
, &f
->exts
);
99 tcf_em_tree_destroy(tp
, &f
->ematches
);
103 static void basic_destroy(struct tcf_proto
*tp
)
105 struct basic_head
*head
= (struct basic_head
*) xchg(&tp
->root
, NULL
);
106 struct basic_filter
*f
, *n
;
108 list_for_each_entry_safe(f
, n
, &head
->flist
, link
) {
110 basic_delete_filter(tp
, f
);
114 static int basic_delete(struct tcf_proto
*tp
, unsigned long arg
)
116 struct basic_head
*head
= (struct basic_head
*) tp
->root
;
117 struct basic_filter
*t
, *f
= (struct basic_filter
*) arg
;
119 list_for_each_entry(t
, &head
->flist
, link
)
124 basic_delete_filter(tp
, t
);
131 static inline int basic_set_parms(struct tcf_proto
*tp
, struct basic_filter
*f
,
132 unsigned long base
, struct rtattr
**tb
,
137 struct tcf_ematch_tree t
;
139 if (tb
[TCA_BASIC_CLASSID
-1])
140 if (RTA_PAYLOAD(tb
[TCA_BASIC_CLASSID
-1]) < sizeof(u32
))
143 err
= tcf_exts_validate(tp
, tb
, est
, &e
, &basic_ext_map
);
147 err
= tcf_em_tree_validate(tp
, tb
[TCA_BASIC_EMATCHES
-1], &t
);
151 if (tb
[TCA_BASIC_CLASSID
-1]) {
152 f
->res
.classid
= *(u32
*)RTA_DATA(tb
[TCA_BASIC_CLASSID
-1]);
153 tcf_bind_filter(tp
, &f
->res
, base
);
156 tcf_exts_change(tp
, &f
->exts
, &e
);
157 tcf_em_tree_change(tp
, &f
->ematches
, &t
);
161 tcf_exts_destroy(tp
, &e
);
165 static int basic_change(struct tcf_proto
*tp
, unsigned long base
, u32 handle
,
166 struct rtattr
**tca
, unsigned long *arg
)
169 struct basic_head
*head
= (struct basic_head
*) tp
->root
;
170 struct rtattr
*tb
[TCA_BASIC_MAX
];
171 struct basic_filter
*f
= (struct basic_filter
*) *arg
;
173 if (tca
[TCA_OPTIONS
-1] == NULL
)
176 if (rtattr_parse_nested(tb
, TCA_BASIC_MAX
, tca
[TCA_OPTIONS
-1]) < 0)
180 if (handle
&& f
->handle
!= handle
)
182 return basic_set_parms(tp
, f
, base
, tb
, tca
[TCA_RATE
-1]);
186 f
= kzalloc(sizeof(*f
), GFP_KERNEL
);
194 unsigned int i
= 0x80000000;
196 if (++head
->hgenerator
== 0x7FFFFFFF)
197 head
->hgenerator
= 1;
198 } while (--i
> 0 && basic_get(tp
, head
->hgenerator
));
201 printk(KERN_ERR
"Insufficient number of handles\n");
205 f
->handle
= head
->hgenerator
;
208 err
= basic_set_parms(tp
, f
, base
, tb
, tca
[TCA_RATE
-1]);
213 list_add(&f
->link
, &head
->flist
);
215 *arg
= (unsigned long) f
;
219 if (*arg
== 0UL && f
)
225 static void basic_walk(struct tcf_proto
*tp
, struct tcf_walker
*arg
)
227 struct basic_head
*head
= (struct basic_head
*) tp
->root
;
228 struct basic_filter
*f
;
230 list_for_each_entry(f
, &head
->flist
, link
) {
231 if (arg
->count
< arg
->skip
)
234 if (arg
->fn(tp
, (unsigned long) f
, arg
) < 0) {
243 static int basic_dump(struct tcf_proto
*tp
, unsigned long fh
,
244 struct sk_buff
*skb
, struct tcmsg
*t
)
246 struct basic_filter
*f
= (struct basic_filter
*) fh
;
247 unsigned char *b
= skb
->tail
;
253 t
->tcm_handle
= f
->handle
;
255 rta
= (struct rtattr
*) b
;
256 RTA_PUT(skb
, TCA_OPTIONS
, 0, NULL
);
259 RTA_PUT(skb
, TCA_BASIC_CLASSID
, sizeof(u32
), &f
->res
.classid
);
261 if (tcf_exts_dump(skb
, &f
->exts
, &basic_ext_map
) < 0 ||
262 tcf_em_tree_dump(skb
, &f
->ematches
, TCA_BASIC_EMATCHES
) < 0)
265 rta
->rta_len
= (skb
->tail
- b
);
269 skb_trim(skb
, b
- skb
->data
);
273 static struct tcf_proto_ops cls_basic_ops
= {
275 .classify
= basic_classify
,
277 .destroy
= basic_destroy
,
280 .change
= basic_change
,
281 .delete = basic_delete
,
284 .owner
= THIS_MODULE
,
287 static int __init
init_basic(void)
289 return register_tcf_proto_ops(&cls_basic_ops
);
292 static void __exit
exit_basic(void)
294 unregister_tcf_proto_ops(&cls_basic_ops
);
297 module_init(init_basic
)
298 module_exit(exit_basic
)
299 MODULE_LICENSE("GPL");