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 __rcu
*ht
[HTSIZE
];
41 struct fw_filter __rcu
*next
;
43 struct tcf_result res
;
44 #ifdef CONFIG_NET_CLS_IND
46 #endif /* CONFIG_NET_CLS_IND */
52 static u32
fw_hash(u32 handle
)
54 handle
^= (handle
>> 16);
55 handle
^= (handle
>> 8);
56 return handle
% HTSIZE
;
59 static int fw_classify(struct sk_buff
*skb
, const struct tcf_proto
*tp
,
60 struct tcf_result
*res
)
62 struct fw_head
*head
= rcu_dereference_bh(tp
->root
);
70 for (f
= rcu_dereference_bh(head
->ht
[fw_hash(id
)]); f
;
71 f
= rcu_dereference_bh(f
->next
)) {
74 #ifdef CONFIG_NET_CLS_IND
75 if (!tcf_match_indev(skb
, f
->ifindex
))
77 #endif /* CONFIG_NET_CLS_IND */
78 r
= tcf_exts_exec(skb
, &f
->exts
, res
);
86 /* Old method: classify the packet using its skb mark. */
87 if (id
&& (TC_H_MAJ(id
) == 0 ||
88 !(TC_H_MAJ(id
^ tp
->q
->handle
)))) {
98 static unsigned long fw_get(struct tcf_proto
*tp
, u32 handle
)
100 struct fw_head
*head
= rtnl_dereference(tp
->root
);
106 f
= rtnl_dereference(head
->ht
[fw_hash(handle
)]);
107 for (; f
; f
= rtnl_dereference(f
->next
)) {
109 return (unsigned long)f
;
114 static int fw_init(struct tcf_proto
*tp
)
116 /* We don't allocate fw_head here, because in the old method
117 * we don't need it at all.
122 static void fw_delete_filter(struct rcu_head
*head
)
124 struct fw_filter
*f
= container_of(head
, struct fw_filter
, rcu
);
126 tcf_exts_destroy(&f
->exts
);
130 static void fw_destroy(struct tcf_proto
*tp
)
132 struct fw_head
*head
= rtnl_dereference(tp
->root
);
139 for (h
= 0; h
< HTSIZE
; h
++) {
140 while ((f
= rtnl_dereference(head
->ht
[h
])) != NULL
) {
141 RCU_INIT_POINTER(head
->ht
[h
],
142 rtnl_dereference(f
->next
));
143 tcf_unbind_filter(tp
, &f
->res
);
144 call_rcu(&f
->rcu
, fw_delete_filter
);
147 kfree_rcu(head
, rcu
);
150 static int fw_delete(struct tcf_proto
*tp
, unsigned long arg
, bool *last
)
152 struct fw_head
*head
= rtnl_dereference(tp
->root
);
153 struct fw_filter
*f
= (struct fw_filter
*)arg
;
154 struct fw_filter __rcu
**fp
;
155 struct fw_filter
*pfp
;
159 if (head
== NULL
|| f
== NULL
)
162 fp
= &head
->ht
[fw_hash(f
->id
)];
164 for (pfp
= rtnl_dereference(*fp
); pfp
;
165 fp
= &pfp
->next
, pfp
= rtnl_dereference(*fp
)) {
167 RCU_INIT_POINTER(*fp
, rtnl_dereference(f
->next
));
168 tcf_unbind_filter(tp
, &f
->res
);
169 call_rcu(&f
->rcu
, fw_delete_filter
);
176 for (h
= 0; h
< HTSIZE
; h
++) {
177 if (rcu_access_pointer(head
->ht
[h
])) {
187 static const struct nla_policy fw_policy
[TCA_FW_MAX
+ 1] = {
188 [TCA_FW_CLASSID
] = { .type
= NLA_U32
},
189 [TCA_FW_INDEV
] = { .type
= NLA_STRING
, .len
= IFNAMSIZ
},
190 [TCA_FW_MASK
] = { .type
= NLA_U32
},
194 fw_change_attrs(struct net
*net
, struct tcf_proto
*tp
, struct fw_filter
*f
,
195 struct nlattr
**tb
, struct nlattr
**tca
, unsigned long base
,
198 struct fw_head
*head
= rtnl_dereference(tp
->root
);
203 err
= tcf_exts_init(&e
, TCA_FW_ACT
, TCA_FW_POLICE
);
206 err
= tcf_exts_validate(net
, tp
, tb
, tca
[TCA_RATE
], &e
, ovr
);
210 if (tb
[TCA_FW_CLASSID
]) {
211 f
->res
.classid
= nla_get_u32(tb
[TCA_FW_CLASSID
]);
212 tcf_bind_filter(tp
, &f
->res
, base
);
215 #ifdef CONFIG_NET_CLS_IND
216 if (tb
[TCA_FW_INDEV
]) {
218 ret
= tcf_change_indev(net
, tb
[TCA_FW_INDEV
]);
225 #endif /* CONFIG_NET_CLS_IND */
228 if (tb
[TCA_FW_MASK
]) {
229 mask
= nla_get_u32(tb
[TCA_FW_MASK
]);
230 if (mask
!= head
->mask
)
232 } else if (head
->mask
!= 0xFFFFFFFF)
235 tcf_exts_change(tp
, &f
->exts
, &e
);
239 tcf_exts_destroy(&e
);
243 static int fw_change(struct net
*net
, struct sk_buff
*in_skb
,
244 struct tcf_proto
*tp
, unsigned long base
,
245 u32 handle
, struct nlattr
**tca
, unsigned long *arg
,
248 struct fw_head
*head
= rtnl_dereference(tp
->root
);
249 struct fw_filter
*f
= (struct fw_filter
*) *arg
;
250 struct nlattr
*opt
= tca
[TCA_OPTIONS
];
251 struct nlattr
*tb
[TCA_FW_MAX
+ 1];
255 return handle
? -EINVAL
: 0; /* Succeed if it is old method. */
257 err
= nla_parse_nested(tb
, TCA_FW_MAX
, opt
, fw_policy
, NULL
);
262 struct fw_filter
*pfp
, *fnew
;
263 struct fw_filter __rcu
**fp
;
265 if (f
->id
!= handle
&& handle
)
268 fnew
= kzalloc(sizeof(struct fw_filter
), GFP_KERNEL
);
274 #ifdef CONFIG_NET_CLS_IND
275 fnew
->ifindex
= f
->ifindex
;
276 #endif /* CONFIG_NET_CLS_IND */
279 err
= tcf_exts_init(&fnew
->exts
, TCA_FW_ACT
, TCA_FW_POLICE
);
285 err
= fw_change_attrs(net
, tp
, fnew
, tb
, tca
, base
, ovr
);
287 tcf_exts_destroy(&fnew
->exts
);
292 fp
= &head
->ht
[fw_hash(fnew
->id
)];
293 for (pfp
= rtnl_dereference(*fp
); pfp
;
294 fp
= &pfp
->next
, pfp
= rtnl_dereference(*fp
))
298 RCU_INIT_POINTER(fnew
->next
, rtnl_dereference(pfp
->next
));
299 rcu_assign_pointer(*fp
, fnew
);
300 tcf_unbind_filter(tp
, &f
->res
);
301 call_rcu(&f
->rcu
, fw_delete_filter
);
303 *arg
= (unsigned long)fnew
;
311 u32 mask
= 0xFFFFFFFF;
313 mask
= nla_get_u32(tb
[TCA_FW_MASK
]);
315 head
= kzalloc(sizeof(*head
), GFP_KERNEL
);
320 rcu_assign_pointer(tp
->root
, head
);
323 f
= kzalloc(sizeof(struct fw_filter
), GFP_KERNEL
);
327 err
= tcf_exts_init(&f
->exts
, TCA_FW_ACT
, TCA_FW_POLICE
);
333 err
= fw_change_attrs(net
, tp
, f
, tb
, tca
, base
, ovr
);
337 RCU_INIT_POINTER(f
->next
, head
->ht
[fw_hash(handle
)]);
338 rcu_assign_pointer(head
->ht
[fw_hash(handle
)], f
);
340 *arg
= (unsigned long)f
;
344 tcf_exts_destroy(&f
->exts
);
349 static void fw_walk(struct tcf_proto
*tp
, struct tcf_walker
*arg
)
351 struct fw_head
*head
= rtnl_dereference(tp
->root
);
360 for (h
= 0; h
< HTSIZE
; h
++) {
363 for (f
= rtnl_dereference(head
->ht
[h
]); f
;
364 f
= rtnl_dereference(f
->next
)) {
365 if (arg
->count
< arg
->skip
) {
369 if (arg
->fn(tp
, (unsigned long)f
, arg
) < 0) {
378 static int fw_dump(struct net
*net
, struct tcf_proto
*tp
, unsigned long fh
,
379 struct sk_buff
*skb
, struct tcmsg
*t
)
381 struct fw_head
*head
= rtnl_dereference(tp
->root
);
382 struct fw_filter
*f
= (struct fw_filter
*)fh
;
388 t
->tcm_handle
= f
->id
;
390 if (!f
->res
.classid
&& !tcf_exts_is_available(&f
->exts
))
393 nest
= nla_nest_start(skb
, TCA_OPTIONS
);
395 goto nla_put_failure
;
397 if (f
->res
.classid
&&
398 nla_put_u32(skb
, TCA_FW_CLASSID
, f
->res
.classid
))
399 goto nla_put_failure
;
400 #ifdef CONFIG_NET_CLS_IND
402 struct net_device
*dev
;
403 dev
= __dev_get_by_index(net
, f
->ifindex
);
404 if (dev
&& nla_put_string(skb
, TCA_FW_INDEV
, dev
->name
))
405 goto nla_put_failure
;
407 #endif /* CONFIG_NET_CLS_IND */
408 if (head
->mask
!= 0xFFFFFFFF &&
409 nla_put_u32(skb
, TCA_FW_MASK
, head
->mask
))
410 goto nla_put_failure
;
412 if (tcf_exts_dump(skb
, &f
->exts
) < 0)
413 goto nla_put_failure
;
415 nla_nest_end(skb
, nest
);
417 if (tcf_exts_dump_stats(skb
, &f
->exts
) < 0)
418 goto nla_put_failure
;
423 nla_nest_cancel(skb
, nest
);
427 static struct tcf_proto_ops cls_fw_ops __read_mostly
= {
429 .classify
= fw_classify
,
431 .destroy
= fw_destroy
,
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");