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>
36 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 u32
fw_hash(u32 handle
)
51 handle
^= (handle
>> 16);
52 handle
^= (handle
>> 8);
53 return handle
% HTSIZE
;
56 static int fw_classify(struct sk_buff
*skb
, const struct tcf_proto
*tp
,
57 struct tcf_result
*res
)
59 struct fw_head
*head
= tp
->root
;
66 for (f
= head
->ht
[fw_hash(id
)]; f
; f
= f
->next
) {
69 #ifdef CONFIG_NET_CLS_IND
70 if (!tcf_match_indev(skb
, f
->ifindex
))
72 #endif /* CONFIG_NET_CLS_IND */
73 r
= tcf_exts_exec(skb
, &f
->exts
, res
);
82 if (id
&& (TC_H_MAJ(id
) == 0 ||
83 !(TC_H_MAJ(id
^ tp
->q
->handle
)))) {
93 static unsigned long fw_get(struct tcf_proto
*tp
, u32 handle
)
95 struct fw_head
*head
= tp
->root
;
101 for (f
= head
->ht
[fw_hash(handle
)]; f
; f
= f
->next
) {
103 return (unsigned long)f
;
108 static void fw_put(struct tcf_proto
*tp
, unsigned long f
)
112 static int fw_init(struct tcf_proto
*tp
)
117 static void fw_delete_filter(struct tcf_proto
*tp
, struct fw_filter
*f
)
119 tcf_unbind_filter(tp
, &f
->res
);
120 tcf_exts_destroy(tp
, &f
->exts
);
124 static void fw_destroy(struct tcf_proto
*tp
)
126 struct fw_head
*head
= tp
->root
;
133 for (h
= 0; h
< HTSIZE
; h
++) {
134 while ((f
= head
->ht
[h
]) != NULL
) {
135 head
->ht
[h
] = f
->next
;
136 fw_delete_filter(tp
, f
);
142 static int fw_delete(struct tcf_proto
*tp
, unsigned long arg
)
144 struct fw_head
*head
= tp
->root
;
145 struct fw_filter
*f
= (struct fw_filter
*)arg
;
146 struct fw_filter
**fp
;
148 if (head
== NULL
|| f
== NULL
)
151 for (fp
= &head
->ht
[fw_hash(f
->id
)]; *fp
; fp
= &(*fp
)->next
) {
156 fw_delete_filter(tp
, f
);
164 static const struct nla_policy fw_policy
[TCA_FW_MAX
+ 1] = {
165 [TCA_FW_CLASSID
] = { .type
= NLA_U32
},
166 [TCA_FW_INDEV
] = { .type
= NLA_STRING
, .len
= IFNAMSIZ
},
167 [TCA_FW_MASK
] = { .type
= NLA_U32
},
171 fw_change_attrs(struct net
*net
, struct tcf_proto
*tp
, struct fw_filter
*f
,
172 struct nlattr
**tb
, struct nlattr
**tca
, unsigned long base
, bool ovr
)
174 struct fw_head
*head
= tp
->root
;
179 tcf_exts_init(&e
, TCA_FW_ACT
, TCA_FW_POLICE
);
180 err
= tcf_exts_validate(net
, tp
, tb
, tca
[TCA_RATE
], &e
, ovr
);
184 if (tb
[TCA_FW_CLASSID
]) {
185 f
->res
.classid
= nla_get_u32(tb
[TCA_FW_CLASSID
]);
186 tcf_bind_filter(tp
, &f
->res
, base
);
189 #ifdef CONFIG_NET_CLS_IND
190 if (tb
[TCA_FW_INDEV
]) {
192 ret
= tcf_change_indev(net
, tb
[TCA_FW_INDEV
]);
199 #endif /* CONFIG_NET_CLS_IND */
202 if (tb
[TCA_FW_MASK
]) {
203 mask
= nla_get_u32(tb
[TCA_FW_MASK
]);
204 if (mask
!= head
->mask
)
206 } else if (head
->mask
!= 0xFFFFFFFF)
209 tcf_exts_change(tp
, &f
->exts
, &e
);
213 tcf_exts_destroy(tp
, &e
);
217 static int fw_change(struct net
*net
, struct sk_buff
*in_skb
,
218 struct tcf_proto
*tp
, unsigned long base
,
221 unsigned long *arg
, bool ovr
)
223 struct fw_head
*head
= tp
->root
;
224 struct fw_filter
*f
= (struct fw_filter
*) *arg
;
225 struct nlattr
*opt
= tca
[TCA_OPTIONS
];
226 struct nlattr
*tb
[TCA_FW_MAX
+ 1];
230 return handle
? -EINVAL
: 0;
232 err
= nla_parse_nested(tb
, TCA_FW_MAX
, opt
, fw_policy
);
237 if (f
->id
!= handle
&& handle
)
239 return fw_change_attrs(net
, tp
, f
, tb
, tca
, base
, ovr
);
246 u32 mask
= 0xFFFFFFFF;
248 mask
= nla_get_u32(tb
[TCA_FW_MASK
]);
250 head
= kzalloc(sizeof(struct fw_head
), GFP_KERNEL
);
260 f
= kzalloc(sizeof(struct fw_filter
), GFP_KERNEL
);
264 tcf_exts_init(&f
->exts
, TCA_FW_ACT
, TCA_FW_POLICE
);
267 err
= fw_change_attrs(net
, tp
, f
, tb
, tca
, base
, ovr
);
271 f
->next
= head
->ht
[fw_hash(handle
)];
273 head
->ht
[fw_hash(handle
)] = f
;
276 *arg
= (unsigned long)f
;
284 static void fw_walk(struct tcf_proto
*tp
, struct tcf_walker
*arg
)
286 struct fw_head
*head
= tp
->root
;
295 for (h
= 0; h
< HTSIZE
; h
++) {
298 for (f
= head
->ht
[h
]; f
; f
= f
->next
) {
299 if (arg
->count
< arg
->skip
) {
303 if (arg
->fn(tp
, (unsigned long)f
, arg
) < 0) {
312 static int fw_dump(struct net
*net
, struct tcf_proto
*tp
, unsigned long fh
,
313 struct sk_buff
*skb
, struct tcmsg
*t
)
315 struct fw_head
*head
= tp
->root
;
316 struct fw_filter
*f
= (struct fw_filter
*)fh
;
317 unsigned char *b
= skb_tail_pointer(skb
);
323 t
->tcm_handle
= f
->id
;
325 if (!f
->res
.classid
&& !tcf_exts_is_available(&f
->exts
))
328 nest
= nla_nest_start(skb
, TCA_OPTIONS
);
330 goto nla_put_failure
;
332 if (f
->res
.classid
&&
333 nla_put_u32(skb
, TCA_FW_CLASSID
, f
->res
.classid
))
334 goto nla_put_failure
;
335 #ifdef CONFIG_NET_CLS_IND
337 struct net_device
*dev
;
338 dev
= __dev_get_by_index(net
, f
->ifindex
);
339 if (dev
&& nla_put_string(skb
, TCA_FW_INDEV
, dev
->name
))
340 goto nla_put_failure
;
342 #endif /* CONFIG_NET_CLS_IND */
343 if (head
->mask
!= 0xFFFFFFFF &&
344 nla_put_u32(skb
, TCA_FW_MASK
, head
->mask
))
345 goto nla_put_failure
;
347 if (tcf_exts_dump(skb
, &f
->exts
) < 0)
348 goto nla_put_failure
;
350 nla_nest_end(skb
, nest
);
352 if (tcf_exts_dump_stats(skb
, &f
->exts
) < 0)
353 goto nla_put_failure
;
362 static struct tcf_proto_ops cls_fw_ops __read_mostly
= {
364 .classify
= fw_classify
,
366 .destroy
= fw_destroy
,
373 .owner
= THIS_MODULE
,
376 static int __init
init_fw(void)
378 return register_tcf_proto_ops(&cls_fw_ops
);
381 static void __exit
exit_fw(void)
383 unregister_tcf_proto_ops(&cls_fw_ops
);
388 MODULE_LICENSE("GPL");