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/slab.h>
14 #include <linux/types.h>
15 #include <linux/kernel.h>
16 #include <linux/string.h>
17 #include <linux/errno.h>
18 #include <linux/rtnetlink.h>
19 #include <linux/skbuff.h>
20 #include <net/netlink.h>
21 #include <net/act_api.h>
22 #include <net/pkt_cls.h>
26 struct list_head flist
;
33 struct tcf_ematch_tree ematches
;
34 struct tcf_result res
;
36 struct list_head link
;
40 static int basic_classify(struct sk_buff
*skb
, const struct tcf_proto
*tp
,
41 struct tcf_result
*res
)
44 struct basic_head
*head
= rcu_dereference_bh(tp
->root
);
45 struct basic_filter
*f
;
47 list_for_each_entry_rcu(f
, &head
->flist
, link
) {
48 if (!tcf_em_tree_match(skb
, &f
->ematches
, NULL
))
51 r
= tcf_exts_exec(skb
, &f
->exts
, res
);
59 static unsigned long basic_get(struct tcf_proto
*tp
, u32 handle
)
61 unsigned long l
= 0UL;
62 struct basic_head
*head
= rtnl_dereference(tp
->root
);
63 struct basic_filter
*f
;
68 list_for_each_entry(f
, &head
->flist
, link
) {
69 if (f
->handle
== handle
) {
70 l
= (unsigned long) f
;
78 static int basic_init(struct tcf_proto
*tp
)
80 struct basic_head
*head
;
82 head
= kzalloc(sizeof(*head
), GFP_KERNEL
);
85 INIT_LIST_HEAD(&head
->flist
);
86 rcu_assign_pointer(tp
->root
, head
);
90 static void basic_delete_filter(struct rcu_head
*head
)
92 struct basic_filter
*f
= container_of(head
, struct basic_filter
, rcu
);
94 tcf_exts_destroy(&f
->exts
);
95 tcf_em_tree_destroy(&f
->ematches
);
99 static bool basic_destroy(struct tcf_proto
*tp
, bool force
)
101 struct basic_head
*head
= rtnl_dereference(tp
->root
);
102 struct basic_filter
*f
, *n
;
104 if (!force
&& !list_empty(&head
->flist
))
107 list_for_each_entry_safe(f
, n
, &head
->flist
, link
) {
108 list_del_rcu(&f
->link
);
109 tcf_unbind_filter(tp
, &f
->res
);
110 call_rcu(&f
->rcu
, basic_delete_filter
);
112 RCU_INIT_POINTER(tp
->root
, NULL
);
113 kfree_rcu(head
, rcu
);
117 static int basic_delete(struct tcf_proto
*tp
, unsigned long arg
)
119 struct basic_filter
*f
= (struct basic_filter
*) arg
;
121 list_del_rcu(&f
->link
);
122 tcf_unbind_filter(tp
, &f
->res
);
123 call_rcu(&f
->rcu
, basic_delete_filter
);
127 static const struct nla_policy basic_policy
[TCA_BASIC_MAX
+ 1] = {
128 [TCA_BASIC_CLASSID
] = { .type
= NLA_U32
},
129 [TCA_BASIC_EMATCHES
] = { .type
= NLA_NESTED
},
132 static int basic_set_parms(struct net
*net
, struct tcf_proto
*tp
,
133 struct basic_filter
*f
, unsigned long base
,
135 struct nlattr
*est
, bool ovr
)
139 struct tcf_ematch_tree t
;
141 err
= tcf_exts_init(&e
, TCA_BASIC_ACT
, TCA_BASIC_POLICE
);
144 err
= tcf_exts_validate(net
, tp
, tb
, est
, &e
, ovr
);
148 err
= tcf_em_tree_validate(tp
, tb
[TCA_BASIC_EMATCHES
], &t
);
152 if (tb
[TCA_BASIC_CLASSID
]) {
153 f
->res
.classid
= nla_get_u32(tb
[TCA_BASIC_CLASSID
]);
154 tcf_bind_filter(tp
, &f
->res
, base
);
157 tcf_exts_change(tp
, &f
->exts
, &e
);
158 tcf_em_tree_change(tp
, &f
->ematches
, &t
);
163 tcf_exts_destroy(&e
);
167 static int basic_change(struct net
*net
, struct sk_buff
*in_skb
,
168 struct tcf_proto
*tp
, unsigned long base
, u32 handle
,
169 struct nlattr
**tca
, unsigned long *arg
, bool ovr
)
172 struct basic_head
*head
= rtnl_dereference(tp
->root
);
173 struct nlattr
*tb
[TCA_BASIC_MAX
+ 1];
174 struct basic_filter
*fold
= (struct basic_filter
*) *arg
;
175 struct basic_filter
*fnew
;
177 if (tca
[TCA_OPTIONS
] == NULL
)
180 err
= nla_parse_nested(tb
, TCA_BASIC_MAX
, tca
[TCA_OPTIONS
],
186 if (handle
&& fold
->handle
!= handle
)
190 fnew
= kzalloc(sizeof(*fnew
), GFP_KERNEL
);
194 err
= tcf_exts_init(&fnew
->exts
, TCA_BASIC_ACT
, TCA_BASIC_POLICE
);
200 fnew
->handle
= handle
;
202 fnew
->handle
= fold
->handle
;
204 unsigned int i
= 0x80000000;
206 if (++head
->hgenerator
== 0x7FFFFFFF)
207 head
->hgenerator
= 1;
208 } while (--i
> 0 && basic_get(tp
, head
->hgenerator
));
211 pr_err("Insufficient number of handles\n");
215 fnew
->handle
= head
->hgenerator
;
218 err
= basic_set_parms(net
, tp
, fnew
, base
, tb
, tca
[TCA_RATE
], ovr
);
222 *arg
= (unsigned long)fnew
;
225 list_replace_rcu(&fold
->link
, &fnew
->link
);
226 tcf_unbind_filter(tp
, &fold
->res
);
227 call_rcu(&fold
->rcu
, basic_delete_filter
);
229 list_add_rcu(&fnew
->link
, &head
->flist
);
234 tcf_exts_destroy(&fnew
->exts
);
239 static void basic_walk(struct tcf_proto
*tp
, struct tcf_walker
*arg
)
241 struct basic_head
*head
= rtnl_dereference(tp
->root
);
242 struct basic_filter
*f
;
244 list_for_each_entry(f
, &head
->flist
, link
) {
245 if (arg
->count
< arg
->skip
)
248 if (arg
->fn(tp
, (unsigned long) f
, arg
) < 0) {
257 static int basic_dump(struct net
*net
, struct tcf_proto
*tp
, unsigned long fh
,
258 struct sk_buff
*skb
, struct tcmsg
*t
)
260 struct basic_filter
*f
= (struct basic_filter
*) fh
;
266 t
->tcm_handle
= f
->handle
;
268 nest
= nla_nest_start(skb
, TCA_OPTIONS
);
270 goto nla_put_failure
;
272 if (f
->res
.classid
&&
273 nla_put_u32(skb
, TCA_BASIC_CLASSID
, f
->res
.classid
))
274 goto nla_put_failure
;
276 if (tcf_exts_dump(skb
, &f
->exts
) < 0 ||
277 tcf_em_tree_dump(skb
, &f
->ematches
, TCA_BASIC_EMATCHES
) < 0)
278 goto nla_put_failure
;
280 nla_nest_end(skb
, nest
);
282 if (tcf_exts_dump_stats(skb
, &f
->exts
) < 0)
283 goto nla_put_failure
;
288 nla_nest_cancel(skb
, nest
);
292 static struct tcf_proto_ops cls_basic_ops __read_mostly
= {
294 .classify
= basic_classify
,
296 .destroy
= basic_destroy
,
298 .change
= basic_change
,
299 .delete = basic_delete
,
302 .owner
= THIS_MODULE
,
305 static int __init
init_basic(void)
307 return register_tcf_proto_ops(&cls_basic_ops
);
310 static void __exit
exit_basic(void)
312 unregister_tcf_proto_ops(&cls_basic_ops
);
315 module_init(init_basic
)
316 module_exit(exit_basic
)
317 MODULE_LICENSE("GPL");