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/types.h>
23 #include <linux/kernel.h>
24 #include <linux/string.h>
25 #include <linux/errno.h>
26 #include <linux/skbuff.h>
27 #include <net/netlink.h>
28 #include <net/act_api.h>
29 #include <net/pkt_cls.h>
31 #define HTSIZE (PAGE_SIZE/sizeof(struct fw_filter *))
35 struct fw_filter
*ht
[HTSIZE
];
41 struct fw_filter
*next
;
43 struct tcf_result res
;
44 #ifdef CONFIG_NET_CLS_IND
46 #endif /* CONFIG_NET_CLS_IND */
50 static struct tcf_ext_map fw_ext_map
= {
52 .police
= TCA_FW_POLICE
55 static __inline__
int fw_hash(u32 handle
)
58 return ((handle
>> 24) & 0xFFF) ^
59 ((handle
>> 12) & 0xFFF) ^
61 else if (HTSIZE
== 2048)
62 return ((handle
>> 22) & 0x7FF) ^
63 ((handle
>> 11) & 0x7FF) ^
65 else if (HTSIZE
== 1024)
66 return ((handle
>> 20) & 0x3FF) ^
67 ((handle
>> 10) & 0x3FF) ^
69 else if (HTSIZE
== 512)
70 return (handle
>> 27) ^
71 ((handle
>> 18) & 0x1FF) ^
72 ((handle
>> 9) & 0x1FF) ^
74 else if (HTSIZE
== 256) {
75 u8
*t
= (u8
*) &handle
;
76 return t
[0] ^ t
[1] ^ t
[2] ^ t
[3];
78 return handle
& (HTSIZE
- 1);
81 static int fw_classify(struct sk_buff
*skb
, struct tcf_proto
*tp
,
82 struct tcf_result
*res
)
84 struct fw_head
*head
= (struct fw_head
*)tp
->root
;
91 for (f
=head
->ht
[fw_hash(id
)]; f
; f
=f
->next
) {
94 #ifdef CONFIG_NET_CLS_IND
95 if (!tcf_match_indev(skb
, f
->indev
))
97 #endif /* CONFIG_NET_CLS_IND */
98 r
= tcf_exts_exec(skb
, &f
->exts
, res
);
107 if (id
&& (TC_H_MAJ(id
) == 0 || !(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
)
142 fw_delete_filter(struct tcf_proto
*tp
, struct fw_filter
*f
)
144 tcf_unbind_filter(tp
, &f
->res
);
145 tcf_exts_destroy(tp
, &f
->exts
);
149 static void fw_destroy(struct tcf_proto
*tp
)
151 struct fw_head
*head
= (struct fw_head
*)xchg(&tp
->root
, NULL
);
158 for (h
=0; h
<HTSIZE
; h
++) {
159 while ((f
=head
->ht
[h
]) != NULL
) {
160 head
->ht
[h
] = f
->next
;
161 fw_delete_filter(tp
, f
);
167 static int fw_delete(struct tcf_proto
*tp
, unsigned long arg
)
169 struct fw_head
*head
= (struct fw_head
*)tp
->root
;
170 struct fw_filter
*f
= (struct fw_filter
*)arg
;
171 struct fw_filter
**fp
;
173 if (head
== NULL
|| f
== NULL
)
176 for (fp
=&head
->ht
[fw_hash(f
->id
)]; *fp
; fp
= &(*fp
)->next
) {
181 fw_delete_filter(tp
, f
);
190 fw_change_attrs(struct tcf_proto
*tp
, struct fw_filter
*f
,
191 struct nlattr
**tb
, struct nlattr
**tca
, unsigned long base
)
193 struct fw_head
*head
= (struct fw_head
*)tp
->root
;
198 err
= tcf_exts_validate(tp
, tb
, tca
[TCA_RATE
], &e
, &fw_ext_map
);
203 if (tb
[TCA_FW_CLASSID
]) {
204 if (nla_len(tb
[TCA_FW_CLASSID
]) != sizeof(u32
))
206 f
->res
.classid
= *(u32
*)nla_data(tb
[TCA_FW_CLASSID
]);
207 tcf_bind_filter(tp
, &f
->res
, base
);
210 #ifdef CONFIG_NET_CLS_IND
211 if (tb
[TCA_FW_INDEV
]) {
212 err
= tcf_change_indev(tp
, f
->indev
, tb
[TCA_FW_INDEV
]);
216 #endif /* CONFIG_NET_CLS_IND */
218 if (tb
[TCA_FW_MASK
]) {
219 if (nla_len(tb
[TCA_FW_MASK
]) != sizeof(u32
))
221 mask
= *(u32
*)nla_data(tb
[TCA_FW_MASK
]);
222 if (mask
!= head
->mask
)
224 } else if (head
->mask
!= 0xFFFFFFFF)
227 tcf_exts_change(tp
, &f
->exts
, &e
);
231 tcf_exts_destroy(tp
, &e
);
235 static int fw_change(struct tcf_proto
*tp
, unsigned long base
,
240 struct fw_head
*head
= (struct fw_head
*)tp
->root
;
241 struct fw_filter
*f
= (struct fw_filter
*) *arg
;
242 struct nlattr
*opt
= tca
[TCA_OPTIONS
];
243 struct nlattr
*tb
[TCA_FW_MAX
+ 1];
247 return handle
? -EINVAL
: 0;
249 err
= nla_parse_nested(tb
, TCA_FW_MAX
, opt
, NULL
);
254 if (f
->id
!= handle
&& handle
)
256 return fw_change_attrs(tp
, f
, tb
, tca
, base
);
263 u32 mask
= 0xFFFFFFFF;
264 if (tb
[TCA_FW_MASK
]) {
265 if (nla_len(tb
[TCA_FW_MASK
]) != sizeof(u32
))
267 mask
= *(u32
*)nla_data(tb
[TCA_FW_MASK
]);
270 head
= kzalloc(sizeof(struct fw_head
), GFP_KERNEL
);
280 f
= kzalloc(sizeof(struct fw_filter
), GFP_KERNEL
);
286 err
= fw_change_attrs(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
= (struct fw_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 tcf_proto
*tp
, unsigned long fh
,
332 struct sk_buff
*skb
, struct tcmsg
*t
)
334 struct fw_head
*head
= (struct fw_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
;
352 NLA_PUT(skb
, TCA_FW_CLASSID
, 4, &f
->res
.classid
);
353 #ifdef CONFIG_NET_CLS_IND
354 if (strlen(f
->indev
))
355 NLA_PUT(skb
, TCA_FW_INDEV
, IFNAMSIZ
, f
->indev
);
356 #endif /* CONFIG_NET_CLS_IND */
357 if (head
->mask
!= 0xFFFFFFFF)
358 NLA_PUT(skb
, TCA_FW_MASK
, 4, &head
->mask
);
360 if (tcf_exts_dump(skb
, &f
->exts
, &fw_ext_map
) < 0)
361 goto nla_put_failure
;
363 nla_nest_end(skb
, nest
);
365 if (tcf_exts_dump_stats(skb
, &f
->exts
, &fw_ext_map
) < 0)
366 goto nla_put_failure
;
375 static struct tcf_proto_ops cls_fw_ops __read_mostly
= {
377 .classify
= fw_classify
,
379 .destroy
= fw_destroy
,
386 .owner
= THIS_MODULE
,
389 static int __init
init_fw(void)
391 return register_tcf_proto_ops(&cls_fw_ops
);
394 static void __exit
exit_fw(void)
396 unregister_tcf_proto_ops(&cls_fw_ops
);
401 MODULE_LICENSE("GPL");