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>
31 #include <net/sch_generic.h>
37 struct fw_filter __rcu
*ht
[HTSIZE
];
42 struct fw_filter __rcu
*next
;
44 struct tcf_result res
;
45 #ifdef CONFIG_NET_CLS_IND
47 #endif /* CONFIG_NET_CLS_IND */
53 static u32
fw_hash(u32 handle
)
55 handle
^= (handle
>> 16);
56 handle
^= (handle
>> 8);
57 return handle
% HTSIZE
;
60 static int fw_classify(struct sk_buff
*skb
, const struct tcf_proto
*tp
,
61 struct tcf_result
*res
)
63 struct fw_head
*head
= rcu_dereference_bh(tp
->root
);
71 for (f
= rcu_dereference_bh(head
->ht
[fw_hash(id
)]); f
;
72 f
= rcu_dereference_bh(f
->next
)) {
75 #ifdef CONFIG_NET_CLS_IND
76 if (!tcf_match_indev(skb
, f
->ifindex
))
78 #endif /* CONFIG_NET_CLS_IND */
79 r
= tcf_exts_exec(skb
, &f
->exts
, res
);
87 struct Qdisc
*q
= tcf_block_q(tp
->chain
->block
);
89 /* Old method: classify the packet using its skb mark. */
90 if (id
&& (TC_H_MAJ(id
) == 0 ||
91 !(TC_H_MAJ(id
^ q
->handle
)))) {
101 static void *fw_get(struct tcf_proto
*tp
, u32 handle
)
103 struct fw_head
*head
= rtnl_dereference(tp
->root
);
109 f
= rtnl_dereference(head
->ht
[fw_hash(handle
)]);
110 for (; f
; f
= rtnl_dereference(f
->next
)) {
117 static int fw_init(struct tcf_proto
*tp
)
119 /* We don't allocate fw_head here, because in the old method
120 * we don't need it at all.
125 static void fw_delete_filter(struct rcu_head
*head
)
127 struct fw_filter
*f
= container_of(head
, struct fw_filter
, rcu
);
129 tcf_exts_destroy(&f
->exts
);
133 static void fw_destroy(struct tcf_proto
*tp
)
135 struct fw_head
*head
= rtnl_dereference(tp
->root
);
142 for (h
= 0; h
< HTSIZE
; h
++) {
143 while ((f
= rtnl_dereference(head
->ht
[h
])) != NULL
) {
144 RCU_INIT_POINTER(head
->ht
[h
],
145 rtnl_dereference(f
->next
));
146 tcf_unbind_filter(tp
, &f
->res
);
147 call_rcu(&f
->rcu
, fw_delete_filter
);
150 kfree_rcu(head
, rcu
);
153 static int fw_delete(struct tcf_proto
*tp
, void *arg
, bool *last
)
155 struct fw_head
*head
= rtnl_dereference(tp
->root
);
156 struct fw_filter
*f
= arg
;
157 struct fw_filter __rcu
**fp
;
158 struct fw_filter
*pfp
;
162 if (head
== NULL
|| f
== NULL
)
165 fp
= &head
->ht
[fw_hash(f
->id
)];
167 for (pfp
= rtnl_dereference(*fp
); pfp
;
168 fp
= &pfp
->next
, pfp
= rtnl_dereference(*fp
)) {
170 RCU_INIT_POINTER(*fp
, rtnl_dereference(f
->next
));
171 tcf_unbind_filter(tp
, &f
->res
);
172 call_rcu(&f
->rcu
, fw_delete_filter
);
179 for (h
= 0; h
< HTSIZE
; h
++) {
180 if (rcu_access_pointer(head
->ht
[h
])) {
190 static const struct nla_policy fw_policy
[TCA_FW_MAX
+ 1] = {
191 [TCA_FW_CLASSID
] = { .type
= NLA_U32
},
192 [TCA_FW_INDEV
] = { .type
= NLA_STRING
, .len
= IFNAMSIZ
},
193 [TCA_FW_MASK
] = { .type
= NLA_U32
},
196 static int fw_set_parms(struct net
*net
, struct tcf_proto
*tp
,
197 struct fw_filter
*f
, struct nlattr
**tb
,
198 struct nlattr
**tca
, unsigned long base
, bool ovr
)
200 struct fw_head
*head
= rtnl_dereference(tp
->root
);
204 err
= tcf_exts_validate(net
, tp
, tb
, tca
[TCA_RATE
], &f
->exts
, ovr
);
208 if (tb
[TCA_FW_CLASSID
]) {
209 f
->res
.classid
= nla_get_u32(tb
[TCA_FW_CLASSID
]);
210 tcf_bind_filter(tp
, &f
->res
, base
);
213 #ifdef CONFIG_NET_CLS_IND
214 if (tb
[TCA_FW_INDEV
]) {
216 ret
= tcf_change_indev(net
, tb
[TCA_FW_INDEV
]);
221 #endif /* CONFIG_NET_CLS_IND */
224 if (tb
[TCA_FW_MASK
]) {
225 mask
= nla_get_u32(tb
[TCA_FW_MASK
]);
226 if (mask
!= head
->mask
)
228 } else if (head
->mask
!= 0xFFFFFFFF)
234 static int fw_change(struct net
*net
, struct sk_buff
*in_skb
,
235 struct tcf_proto
*tp
, unsigned long base
,
236 u32 handle
, struct nlattr
**tca
, void **arg
,
239 struct fw_head
*head
= rtnl_dereference(tp
->root
);
240 struct fw_filter
*f
= *arg
;
241 struct nlattr
*opt
= tca
[TCA_OPTIONS
];
242 struct nlattr
*tb
[TCA_FW_MAX
+ 1];
246 return handle
? -EINVAL
: 0; /* Succeed if it is old method. */
248 err
= nla_parse_nested(tb
, TCA_FW_MAX
, opt
, fw_policy
, NULL
);
253 struct fw_filter
*pfp
, *fnew
;
254 struct fw_filter __rcu
**fp
;
256 if (f
->id
!= handle
&& handle
)
259 fnew
= kzalloc(sizeof(struct fw_filter
), GFP_KERNEL
);
265 #ifdef CONFIG_NET_CLS_IND
266 fnew
->ifindex
= f
->ifindex
;
267 #endif /* CONFIG_NET_CLS_IND */
270 err
= tcf_exts_init(&fnew
->exts
, TCA_FW_ACT
, TCA_FW_POLICE
);
276 err
= fw_set_parms(net
, tp
, fnew
, tb
, tca
, base
, ovr
);
278 tcf_exts_destroy(&fnew
->exts
);
283 fp
= &head
->ht
[fw_hash(fnew
->id
)];
284 for (pfp
= rtnl_dereference(*fp
); pfp
;
285 fp
= &pfp
->next
, pfp
= rtnl_dereference(*fp
))
289 RCU_INIT_POINTER(fnew
->next
, rtnl_dereference(pfp
->next
));
290 rcu_assign_pointer(*fp
, fnew
);
291 tcf_unbind_filter(tp
, &f
->res
);
292 call_rcu(&f
->rcu
, fw_delete_filter
);
302 u32 mask
= 0xFFFFFFFF;
304 mask
= nla_get_u32(tb
[TCA_FW_MASK
]);
306 head
= kzalloc(sizeof(*head
), GFP_KERNEL
);
311 rcu_assign_pointer(tp
->root
, head
);
314 f
= kzalloc(sizeof(struct fw_filter
), GFP_KERNEL
);
318 err
= tcf_exts_init(&f
->exts
, TCA_FW_ACT
, TCA_FW_POLICE
);
324 err
= fw_set_parms(net
, tp
, f
, tb
, tca
, base
, ovr
);
328 RCU_INIT_POINTER(f
->next
, head
->ht
[fw_hash(handle
)]);
329 rcu_assign_pointer(head
->ht
[fw_hash(handle
)], f
);
335 tcf_exts_destroy(&f
->exts
);
340 static void fw_walk(struct tcf_proto
*tp
, struct tcf_walker
*arg
)
342 struct fw_head
*head
= rtnl_dereference(tp
->root
);
351 for (h
= 0; h
< HTSIZE
; h
++) {
354 for (f
= rtnl_dereference(head
->ht
[h
]); f
;
355 f
= rtnl_dereference(f
->next
)) {
356 if (arg
->count
< arg
->skip
) {
360 if (arg
->fn(tp
, f
, arg
) < 0) {
369 static int fw_dump(struct net
*net
, struct tcf_proto
*tp
, void *fh
,
370 struct sk_buff
*skb
, struct tcmsg
*t
)
372 struct fw_head
*head
= rtnl_dereference(tp
->root
);
373 struct fw_filter
*f
= fh
;
379 t
->tcm_handle
= f
->id
;
381 if (!f
->res
.classid
&& !tcf_exts_has_actions(&f
->exts
))
384 nest
= nla_nest_start(skb
, TCA_OPTIONS
);
386 goto nla_put_failure
;
388 if (f
->res
.classid
&&
389 nla_put_u32(skb
, TCA_FW_CLASSID
, f
->res
.classid
))
390 goto nla_put_failure
;
391 #ifdef CONFIG_NET_CLS_IND
393 struct net_device
*dev
;
394 dev
= __dev_get_by_index(net
, f
->ifindex
);
395 if (dev
&& nla_put_string(skb
, TCA_FW_INDEV
, dev
->name
))
396 goto nla_put_failure
;
398 #endif /* CONFIG_NET_CLS_IND */
399 if (head
->mask
!= 0xFFFFFFFF &&
400 nla_put_u32(skb
, TCA_FW_MASK
, head
->mask
))
401 goto nla_put_failure
;
403 if (tcf_exts_dump(skb
, &f
->exts
) < 0)
404 goto nla_put_failure
;
406 nla_nest_end(skb
, nest
);
408 if (tcf_exts_dump_stats(skb
, &f
->exts
) < 0)
409 goto nla_put_failure
;
414 nla_nest_cancel(skb
, nest
);
418 static void fw_bind_class(void *fh
, u32 classid
, unsigned long cl
)
420 struct fw_filter
*f
= fh
;
422 if (f
&& f
->res
.classid
== classid
)
426 static struct tcf_proto_ops cls_fw_ops __read_mostly
= {
428 .classify
= fw_classify
,
430 .destroy
= fw_destroy
,
436 .bind_class
= fw_bind_class
,
437 .owner
= THIS_MODULE
,
440 static int __init
init_fw(void)
442 return register_tcf_proto_ops(&cls_fw_ops
);
445 static void __exit
exit_fw(void)
447 unregister_tcf_proto_ops(&cls_fw_ops
);
452 MODULE_LICENSE("GPL");