2 * net/sched/cls_u32.c Ugly (or Universal) 32bit key 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: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
11 * The filters are packed to hash tables of key nodes
12 * with a set of 32bit key/mask pairs at every node.
13 * Nodes reference next level hash tables etc.
15 * This scheme is the best universal classifier I managed to
16 * invent; it is not super-fast, but it is not slow (provided you
17 * program it correctly), and general enough. And its relative
18 * speed grows as the number of rules becomes larger.
20 * It seems that it represents the best middle point between
21 * speed and manageability both by human and by machine.
23 * It is especially useful for link sharing combined with QoS;
24 * pure RSVP doesn't need such a general approach and can use
25 * much simpler (and faster) schemes, sort of cls_rsvp.c.
27 * JHS: We should remove the CONFIG_NET_CLS_IND from here
28 * eventually when the meta match extension is made available
30 * nfmark match added by Catalin(ux aka Dino) BOIE <catab at umbrella.ro>
33 #include <linux/module.h>
34 #include <linux/slab.h>
35 #include <linux/types.h>
36 #include <linux/kernel.h>
37 #include <linux/string.h>
38 #include <linux/errno.h>
39 #include <linux/percpu.h>
40 #include <linux/rtnetlink.h>
41 #include <linux/skbuff.h>
42 #include <linux/bitmap.h>
43 #include <net/netlink.h>
44 #include <net/act_api.h>
45 #include <net/pkt_cls.h>
48 struct tc_u_knode __rcu
*next
;
50 struct tc_u_hnode __rcu
*ht_up
;
52 #ifdef CONFIG_NET_CLS_IND
56 struct tcf_result res
;
57 struct tc_u_hnode __rcu
*ht_down
;
58 #ifdef CONFIG_CLS_U32_PERF
59 struct tc_u32_pcnt __percpu
*pf
;
61 #ifdef CONFIG_CLS_U32_MARK
64 u32 __percpu
*pcpu_success
;
68 /* The 'sel' field MUST be the last field in structure to allow for
69 * tc_u32_keys allocated at end of structure.
71 struct tc_u32_sel sel
;
75 struct tc_u_hnode __rcu
*next
;
78 struct tc_u_common
*tp_c
;
82 /* The 'ht' field MUST be the last field in structure to allow for
83 * more entries allocated at end of structure.
85 struct tc_u_knode __rcu
*ht
[1];
89 struct tc_u_hnode __rcu
*hlist
;
96 static inline unsigned int u32_hash_fold(__be32 key
,
97 const struct tc_u32_sel
*sel
,
100 unsigned int h
= ntohl(key
& sel
->hmask
) >> fshift
;
105 static int u32_classify(struct sk_buff
*skb
, const struct tcf_proto
*tp
, struct tcf_result
*res
)
108 struct tc_u_knode
*knode
;
110 } stack
[TC_U32_MAXDEPTH
];
112 struct tc_u_hnode
*ht
= rcu_dereference_bh(tp
->root
);
113 unsigned int off
= skb_network_offset(skb
);
114 struct tc_u_knode
*n
;
118 #ifdef CONFIG_CLS_U32_PERF
124 n
= rcu_dereference_bh(ht
->ht
[sel
]);
128 struct tc_u32_key
*key
= n
->sel
.keys
;
130 #ifdef CONFIG_CLS_U32_PERF
131 __this_cpu_inc(n
->pf
->rcnt
);
135 #ifdef CONFIG_CLS_U32_MARK
136 if ((skb
->mark
& n
->mask
) != n
->val
) {
137 n
= rcu_dereference_bh(n
->next
);
140 __this_cpu_inc(*n
->pcpu_success
);
144 for (i
= n
->sel
.nkeys
; i
> 0; i
--, key
++) {
145 int toff
= off
+ key
->off
+ (off2
& key
->offmask
);
148 if (skb_headroom(skb
) + toff
> INT_MAX
)
151 data
= skb_header_pointer(skb
, toff
, 4, &hdata
);
154 if ((*data
^ key
->val
) & key
->mask
) {
155 n
= rcu_dereference_bh(n
->next
);
158 #ifdef CONFIG_CLS_U32_PERF
159 __this_cpu_inc(n
->pf
->kcnts
[j
]);
164 ht
= rcu_dereference_bh(n
->ht_down
);
167 if (n
->sel
.flags
& TC_U32_TERMINAL
) {
170 #ifdef CONFIG_NET_CLS_IND
171 if (!tcf_match_indev(skb
, n
->ifindex
)) {
172 n
= rcu_dereference_bh(n
->next
);
176 #ifdef CONFIG_CLS_U32_PERF
177 __this_cpu_inc(n
->pf
->rhit
);
179 r
= tcf_exts_exec(skb
, &n
->exts
, res
);
181 n
= rcu_dereference_bh(n
->next
);
187 n
= rcu_dereference_bh(n
->next
);
192 if (sdepth
>= TC_U32_MAXDEPTH
)
194 stack
[sdepth
].knode
= n
;
195 stack
[sdepth
].off
= off
;
198 ht
= rcu_dereference_bh(n
->ht_down
);
203 data
= skb_header_pointer(skb
, off
+ n
->sel
.hoff
, 4,
207 sel
= ht
->divisor
& u32_hash_fold(*data
, &n
->sel
,
210 if (!(n
->sel
.flags
& (TC_U32_VAROFFSET
| TC_U32_OFFSET
| TC_U32_EAT
)))
213 if (n
->sel
.flags
& (TC_U32_OFFSET
| TC_U32_VAROFFSET
)) {
214 off2
= n
->sel
.off
+ 3;
215 if (n
->sel
.flags
& TC_U32_VAROFFSET
) {
218 data
= skb_header_pointer(skb
,
223 off2
+= ntohs(n
->sel
.offmask
& *data
) >>
228 if (n
->sel
.flags
& TC_U32_EAT
) {
239 n
= stack
[sdepth
].knode
;
240 ht
= rcu_dereference_bh(n
->ht_up
);
241 off
= stack
[sdepth
].off
;
248 net_warn_ratelimited("cls_u32: dead loop\n");
252 static struct tc_u_hnode
*
253 u32_lookup_ht(struct tc_u_common
*tp_c
, u32 handle
)
255 struct tc_u_hnode
*ht
;
257 for (ht
= rtnl_dereference(tp_c
->hlist
);
259 ht
= rtnl_dereference(ht
->next
))
260 if (ht
->handle
== handle
)
266 static struct tc_u_knode
*
267 u32_lookup_key(struct tc_u_hnode
*ht
, u32 handle
)
270 struct tc_u_knode
*n
= NULL
;
272 sel
= TC_U32_HASH(handle
);
273 if (sel
> ht
->divisor
)
276 for (n
= rtnl_dereference(ht
->ht
[sel
]);
278 n
= rtnl_dereference(n
->next
))
279 if (n
->handle
== handle
)
286 static unsigned long u32_get(struct tcf_proto
*tp
, u32 handle
)
288 struct tc_u_hnode
*ht
;
289 struct tc_u_common
*tp_c
= tp
->data
;
291 if (TC_U32_HTID(handle
) == TC_U32_ROOT
)
292 ht
= rtnl_dereference(tp
->root
);
294 ht
= u32_lookup_ht(tp_c
, TC_U32_HTID(handle
));
299 if (TC_U32_KEY(handle
) == 0)
300 return (unsigned long)ht
;
302 return (unsigned long)u32_lookup_key(ht
, handle
);
305 static u32
gen_new_htid(struct tc_u_common
*tp_c
)
309 /* hgenerator only used inside rtnl lock it is safe to increment
310 * without read _copy_ update semantics
313 if (++tp_c
->hgenerator
== 0x7FF)
314 tp_c
->hgenerator
= 1;
315 } while (--i
> 0 && u32_lookup_ht(tp_c
, (tp_c
->hgenerator
|0x800)<<20));
317 return i
> 0 ? (tp_c
->hgenerator
|0x800)<<20 : 0;
320 static int u32_init(struct tcf_proto
*tp
)
322 struct tc_u_hnode
*root_ht
;
323 struct tc_u_common
*tp_c
;
325 tp_c
= tp
->q
->u32_node
;
327 root_ht
= kzalloc(sizeof(*root_ht
), GFP_KERNEL
);
331 root_ht
->divisor
= 0;
333 root_ht
->handle
= tp_c
? gen_new_htid(tp_c
) : 0x80000000;
334 root_ht
->prio
= tp
->prio
;
337 tp_c
= kzalloc(sizeof(*tp_c
), GFP_KERNEL
);
343 tp
->q
->u32_node
= tp_c
;
347 RCU_INIT_POINTER(root_ht
->next
, tp_c
->hlist
);
348 rcu_assign_pointer(tp_c
->hlist
, root_ht
);
349 root_ht
->tp_c
= tp_c
;
351 rcu_assign_pointer(tp
->root
, root_ht
);
356 static int u32_destroy_key(struct tcf_proto
*tp
,
357 struct tc_u_knode
*n
,
360 tcf_exts_destroy(&n
->exts
);
362 n
->ht_down
->refcnt
--;
363 #ifdef CONFIG_CLS_U32_PERF
367 #ifdef CONFIG_CLS_U32_MARK
369 free_percpu(n
->pcpu_success
);
375 /* u32_delete_key_rcu should be called when free'ing a copied
376 * version of a tc_u_knode obtained from u32_init_knode(). When
377 * copies are obtained from u32_init_knode() the statistics are
378 * shared between the old and new copies to allow readers to
379 * continue to update the statistics during the copy. To support
380 * this the u32_delete_key_rcu variant does not free the percpu
383 static void u32_delete_key_rcu(struct rcu_head
*rcu
)
385 struct tc_u_knode
*key
= container_of(rcu
, struct tc_u_knode
, rcu
);
387 u32_destroy_key(key
->tp
, key
, false);
390 /* u32_delete_key_freepf_rcu is the rcu callback variant
391 * that free's the entire structure including the statistics
392 * percpu variables. Only use this if the key is not a copy
393 * returned by u32_init_knode(). See u32_delete_key_rcu()
394 * for the variant that should be used with keys return from
397 static void u32_delete_key_freepf_rcu(struct rcu_head
*rcu
)
399 struct tc_u_knode
*key
= container_of(rcu
, struct tc_u_knode
, rcu
);
401 u32_destroy_key(key
->tp
, key
, true);
404 static int u32_delete_key(struct tcf_proto
*tp
, struct tc_u_knode
*key
)
406 struct tc_u_knode __rcu
**kp
;
407 struct tc_u_knode
*pkp
;
408 struct tc_u_hnode
*ht
= rtnl_dereference(key
->ht_up
);
411 kp
= &ht
->ht
[TC_U32_HASH(key
->handle
)];
412 for (pkp
= rtnl_dereference(*kp
); pkp
;
413 kp
= &pkp
->next
, pkp
= rtnl_dereference(*kp
)) {
415 RCU_INIT_POINTER(*kp
, key
->next
);
417 tcf_unbind_filter(tp
, &key
->res
);
418 call_rcu(&key
->rcu
, u32_delete_key_freepf_rcu
);
427 static void u32_clear_hnode(struct tcf_proto
*tp
, struct tc_u_hnode
*ht
)
429 struct tc_u_knode
*n
;
432 for (h
= 0; h
<= ht
->divisor
; h
++) {
433 while ((n
= rtnl_dereference(ht
->ht
[h
])) != NULL
) {
434 RCU_INIT_POINTER(ht
->ht
[h
],
435 rtnl_dereference(n
->next
));
436 tcf_unbind_filter(tp
, &n
->res
);
437 call_rcu(&n
->rcu
, u32_delete_key_freepf_rcu
);
442 static int u32_destroy_hnode(struct tcf_proto
*tp
, struct tc_u_hnode
*ht
)
444 struct tc_u_common
*tp_c
= tp
->data
;
445 struct tc_u_hnode __rcu
**hn
;
446 struct tc_u_hnode
*phn
;
450 u32_clear_hnode(tp
, ht
);
453 for (phn
= rtnl_dereference(*hn
);
455 hn
= &phn
->next
, phn
= rtnl_dereference(*hn
)) {
457 RCU_INIT_POINTER(*hn
, ht
->next
);
466 static void u32_destroy(struct tcf_proto
*tp
)
468 struct tc_u_common
*tp_c
= tp
->data
;
469 struct tc_u_hnode
*root_ht
= rtnl_dereference(tp
->root
);
471 WARN_ON(root_ht
== NULL
);
473 if (root_ht
&& --root_ht
->refcnt
== 0)
474 u32_destroy_hnode(tp
, root_ht
);
476 if (--tp_c
->refcnt
== 0) {
477 struct tc_u_hnode
*ht
;
479 tp
->q
->u32_node
= NULL
;
481 for (ht
= rtnl_dereference(tp_c
->hlist
);
483 ht
= rtnl_dereference(ht
->next
)) {
485 u32_clear_hnode(tp
, ht
);
488 while ((ht
= rtnl_dereference(tp_c
->hlist
)) != NULL
) {
489 RCU_INIT_POINTER(tp_c
->hlist
, ht
->next
);
499 static int u32_delete(struct tcf_proto
*tp
, unsigned long arg
)
501 struct tc_u_hnode
*ht
= (struct tc_u_hnode
*)arg
;
502 struct tc_u_hnode
*root_ht
= rtnl_dereference(tp
->root
);
507 if (TC_U32_KEY(ht
->handle
))
508 return u32_delete_key(tp
, (struct tc_u_knode
*)ht
);
513 if (ht
->refcnt
== 1) {
515 u32_destroy_hnode(tp
, ht
);
523 #define NR_U32_NODE (1<<12)
524 static u32
gen_new_kid(struct tc_u_hnode
*ht
, u32 handle
)
526 struct tc_u_knode
*n
;
528 unsigned long *bitmap
= kzalloc(BITS_TO_LONGS(NR_U32_NODE
) * sizeof(unsigned long),
531 return handle
| 0xFFF;
533 for (n
= rtnl_dereference(ht
->ht
[TC_U32_HASH(handle
)]);
535 n
= rtnl_dereference(n
->next
))
536 set_bit(TC_U32_NODE(n
->handle
), bitmap
);
538 i
= find_next_zero_bit(bitmap
, NR_U32_NODE
, 0x800);
539 if (i
>= NR_U32_NODE
)
540 i
= find_next_zero_bit(bitmap
, NR_U32_NODE
, 1);
543 return handle
| (i
>= NR_U32_NODE
? 0xFFF : i
);
546 static const struct nla_policy u32_policy
[TCA_U32_MAX
+ 1] = {
547 [TCA_U32_CLASSID
] = { .type
= NLA_U32
},
548 [TCA_U32_HASH
] = { .type
= NLA_U32
},
549 [TCA_U32_LINK
] = { .type
= NLA_U32
},
550 [TCA_U32_DIVISOR
] = { .type
= NLA_U32
},
551 [TCA_U32_SEL
] = { .len
= sizeof(struct tc_u32_sel
) },
552 [TCA_U32_INDEV
] = { .type
= NLA_STRING
, .len
= IFNAMSIZ
},
553 [TCA_U32_MARK
] = { .len
= sizeof(struct tc_u32_mark
) },
556 static int u32_set_parms(struct net
*net
, struct tcf_proto
*tp
,
557 unsigned long base
, struct tc_u_hnode
*ht
,
558 struct tc_u_knode
*n
, struct nlattr
**tb
,
559 struct nlattr
*est
, bool ovr
)
564 tcf_exts_init(&e
, TCA_U32_ACT
, TCA_U32_POLICE
);
565 err
= tcf_exts_validate(net
, tp
, tb
, est
, &e
, ovr
);
570 if (tb
[TCA_U32_LINK
]) {
571 u32 handle
= nla_get_u32(tb
[TCA_U32_LINK
]);
572 struct tc_u_hnode
*ht_down
= NULL
, *ht_old
;
574 if (TC_U32_KEY(handle
))
578 ht_down
= u32_lookup_ht(ht
->tp_c
, handle
);
585 ht_old
= rtnl_dereference(n
->ht_down
);
586 rcu_assign_pointer(n
->ht_down
, ht_down
);
591 if (tb
[TCA_U32_CLASSID
]) {
592 n
->res
.classid
= nla_get_u32(tb
[TCA_U32_CLASSID
]);
593 tcf_bind_filter(tp
, &n
->res
, base
);
596 #ifdef CONFIG_NET_CLS_IND
597 if (tb
[TCA_U32_INDEV
]) {
599 ret
= tcf_change_indev(net
, tb
[TCA_U32_INDEV
]);
605 tcf_exts_change(tp
, &n
->exts
, &e
);
609 tcf_exts_destroy(&e
);
613 static void u32_replace_knode(struct tcf_proto
*tp
,
614 struct tc_u_common
*tp_c
,
615 struct tc_u_knode
*n
)
617 struct tc_u_knode __rcu
**ins
;
618 struct tc_u_knode
*pins
;
619 struct tc_u_hnode
*ht
;
621 if (TC_U32_HTID(n
->handle
) == TC_U32_ROOT
)
622 ht
= rtnl_dereference(tp
->root
);
624 ht
= u32_lookup_ht(tp_c
, TC_U32_HTID(n
->handle
));
626 ins
= &ht
->ht
[TC_U32_HASH(n
->handle
)];
628 /* The node must always exist for it to be replaced if this is not the
629 * case then something went very wrong elsewhere.
631 for (pins
= rtnl_dereference(*ins
); ;
632 ins
= &pins
->next
, pins
= rtnl_dereference(*ins
))
633 if (pins
->handle
== n
->handle
)
636 RCU_INIT_POINTER(n
->next
, pins
->next
);
637 rcu_assign_pointer(*ins
, n
);
640 static struct tc_u_knode
*u32_init_knode(struct tcf_proto
*tp
,
641 struct tc_u_knode
*n
)
643 struct tc_u_knode
*new;
644 struct tc_u32_sel
*s
= &n
->sel
;
646 new = kzalloc(sizeof(*n
) + s
->nkeys
*sizeof(struct tc_u32_key
),
652 RCU_INIT_POINTER(new->next
, n
->next
);
653 new->handle
= n
->handle
;
654 RCU_INIT_POINTER(new->ht_up
, n
->ht_up
);
656 #ifdef CONFIG_NET_CLS_IND
657 new->ifindex
= n
->ifindex
;
659 new->fshift
= n
->fshift
;
661 RCU_INIT_POINTER(new->ht_down
, n
->ht_down
);
663 /* bump reference count as long as we hold pointer to structure */
665 new->ht_down
->refcnt
++;
667 #ifdef CONFIG_CLS_U32_PERF
668 /* Statistics may be incremented by readers during update
669 * so we must keep them in tact. When the node is later destroyed
670 * a special destroy call must be made to not free the pf memory.
675 #ifdef CONFIG_CLS_U32_MARK
678 /* Similarly success statistics must be moved as pointers */
679 new->pcpu_success
= n
->pcpu_success
;
682 memcpy(&new->sel
, s
, sizeof(*s
) + s
->nkeys
*sizeof(struct tc_u32_key
));
684 tcf_exts_init(&new->exts
, TCA_U32_ACT
, TCA_U32_POLICE
);
689 static int u32_change(struct net
*net
, struct sk_buff
*in_skb
,
690 struct tcf_proto
*tp
, unsigned long base
, u32 handle
,
692 unsigned long *arg
, bool ovr
)
694 struct tc_u_common
*tp_c
= tp
->data
;
695 struct tc_u_hnode
*ht
;
696 struct tc_u_knode
*n
;
697 struct tc_u32_sel
*s
;
698 struct nlattr
*opt
= tca
[TCA_OPTIONS
];
699 struct nlattr
*tb
[TCA_U32_MAX
+ 1];
702 #ifdef CONFIG_CLS_U32_PERF
707 return handle
? -EINVAL
: 0;
709 err
= nla_parse_nested(tb
, TCA_U32_MAX
, opt
, u32_policy
);
713 n
= (struct tc_u_knode
*)*arg
;
715 struct tc_u_knode
*new;
717 if (TC_U32_KEY(n
->handle
) == 0)
720 new = u32_init_knode(tp
, n
);
724 err
= u32_set_parms(net
, tp
, base
,
725 rtnl_dereference(n
->ht_up
), new, tb
,
729 u32_destroy_key(tp
, new, false);
733 u32_replace_knode(tp
, tp_c
, new);
734 tcf_unbind_filter(tp
, &n
->res
);
735 call_rcu(&n
->rcu
, u32_delete_key_rcu
);
739 if (tb
[TCA_U32_DIVISOR
]) {
740 unsigned int divisor
= nla_get_u32(tb
[TCA_U32_DIVISOR
]);
742 if (--divisor
> 0x100)
744 if (TC_U32_KEY(handle
))
747 handle
= gen_new_htid(tp
->data
);
751 ht
= kzalloc(sizeof(*ht
) + divisor
*sizeof(void *), GFP_KERNEL
);
756 ht
->divisor
= divisor
;
759 RCU_INIT_POINTER(ht
->next
, tp_c
->hlist
);
760 rcu_assign_pointer(tp_c
->hlist
, ht
);
761 *arg
= (unsigned long)ht
;
765 if (tb
[TCA_U32_HASH
]) {
766 htid
= nla_get_u32(tb
[TCA_U32_HASH
]);
767 if (TC_U32_HTID(htid
) == TC_U32_ROOT
) {
768 ht
= rtnl_dereference(tp
->root
);
771 ht
= u32_lookup_ht(tp
->data
, TC_U32_HTID(htid
));
776 ht
= rtnl_dereference(tp
->root
);
780 if (ht
->divisor
< TC_U32_HASH(htid
))
784 if (TC_U32_HTID(handle
) && TC_U32_HTID(handle
^htid
))
786 handle
= htid
| TC_U32_NODE(handle
);
788 handle
= gen_new_kid(ht
, htid
);
790 if (tb
[TCA_U32_SEL
] == NULL
)
793 s
= nla_data(tb
[TCA_U32_SEL
]);
795 n
= kzalloc(sizeof(*n
) + s
->nkeys
*sizeof(struct tc_u32_key
), GFP_KERNEL
);
799 #ifdef CONFIG_CLS_U32_PERF
800 size
= sizeof(struct tc_u32_pcnt
) + s
->nkeys
* sizeof(u64
);
801 n
->pf
= __alloc_percpu(size
, __alignof__(struct tc_u32_pcnt
));
808 memcpy(&n
->sel
, s
, sizeof(*s
) + s
->nkeys
*sizeof(struct tc_u32_key
));
809 RCU_INIT_POINTER(n
->ht_up
, ht
);
811 n
->fshift
= s
->hmask
? ffs(ntohl(s
->hmask
)) - 1 : 0;
812 tcf_exts_init(&n
->exts
, TCA_U32_ACT
, TCA_U32_POLICE
);
815 #ifdef CONFIG_CLS_U32_MARK
816 n
->pcpu_success
= alloc_percpu(u32
);
817 if (!n
->pcpu_success
) {
822 if (tb
[TCA_U32_MARK
]) {
823 struct tc_u32_mark
*mark
;
825 mark
= nla_data(tb
[TCA_U32_MARK
]);
827 n
->mask
= mark
->mask
;
831 err
= u32_set_parms(net
, tp
, base
, ht
, n
, tb
, tca
[TCA_RATE
], ovr
);
833 struct tc_u_knode __rcu
**ins
;
834 struct tc_u_knode
*pins
;
836 ins
= &ht
->ht
[TC_U32_HASH(handle
)];
837 for (pins
= rtnl_dereference(*ins
); pins
;
838 ins
= &pins
->next
, pins
= rtnl_dereference(*ins
))
839 if (TC_U32_NODE(handle
) < TC_U32_NODE(pins
->handle
))
842 RCU_INIT_POINTER(n
->next
, pins
);
843 rcu_assign_pointer(*ins
, n
);
845 *arg
= (unsigned long)n
;
849 #ifdef CONFIG_CLS_U32_MARK
850 free_percpu(n
->pcpu_success
);
854 #ifdef CONFIG_CLS_U32_PERF
861 static void u32_walk(struct tcf_proto
*tp
, struct tcf_walker
*arg
)
863 struct tc_u_common
*tp_c
= tp
->data
;
864 struct tc_u_hnode
*ht
;
865 struct tc_u_knode
*n
;
871 for (ht
= rtnl_dereference(tp_c
->hlist
);
873 ht
= rtnl_dereference(ht
->next
)) {
874 if (ht
->prio
!= tp
->prio
)
876 if (arg
->count
>= arg
->skip
) {
877 if (arg
->fn(tp
, (unsigned long)ht
, arg
) < 0) {
883 for (h
= 0; h
<= ht
->divisor
; h
++) {
884 for (n
= rtnl_dereference(ht
->ht
[h
]);
886 n
= rtnl_dereference(n
->next
)) {
887 if (arg
->count
< arg
->skip
) {
891 if (arg
->fn(tp
, (unsigned long)n
, arg
) < 0) {
901 static int u32_dump(struct net
*net
, struct tcf_proto
*tp
, unsigned long fh
,
902 struct sk_buff
*skb
, struct tcmsg
*t
)
904 struct tc_u_knode
*n
= (struct tc_u_knode
*)fh
;
905 struct tc_u_hnode
*ht_up
, *ht_down
;
911 t
->tcm_handle
= n
->handle
;
913 nest
= nla_nest_start(skb
, TCA_OPTIONS
);
915 goto nla_put_failure
;
917 if (TC_U32_KEY(n
->handle
) == 0) {
918 struct tc_u_hnode
*ht
= (struct tc_u_hnode
*)fh
;
919 u32 divisor
= ht
->divisor
+ 1;
921 if (nla_put_u32(skb
, TCA_U32_DIVISOR
, divisor
))
922 goto nla_put_failure
;
924 #ifdef CONFIG_CLS_U32_PERF
925 struct tc_u32_pcnt
*gpf
;
929 if (nla_put(skb
, TCA_U32_SEL
,
930 sizeof(n
->sel
) + n
->sel
.nkeys
*sizeof(struct tc_u32_key
),
932 goto nla_put_failure
;
934 ht_up
= rtnl_dereference(n
->ht_up
);
936 u32 htid
= n
->handle
& 0xFFFFF000;
937 if (nla_put_u32(skb
, TCA_U32_HASH
, htid
))
938 goto nla_put_failure
;
940 if (n
->res
.classid
&&
941 nla_put_u32(skb
, TCA_U32_CLASSID
, n
->res
.classid
))
942 goto nla_put_failure
;
944 ht_down
= rtnl_dereference(n
->ht_down
);
946 nla_put_u32(skb
, TCA_U32_LINK
, ht_down
->handle
))
947 goto nla_put_failure
;
949 #ifdef CONFIG_CLS_U32_MARK
950 if ((n
->val
|| n
->mask
)) {
951 struct tc_u32_mark mark
= {.val
= n
->val
,
956 for_each_possible_cpu(cpum
) {
957 __u32 cnt
= *per_cpu_ptr(n
->pcpu_success
, cpum
);
962 if (nla_put(skb
, TCA_U32_MARK
, sizeof(mark
), &mark
))
963 goto nla_put_failure
;
967 if (tcf_exts_dump(skb
, &n
->exts
) < 0)
968 goto nla_put_failure
;
970 #ifdef CONFIG_NET_CLS_IND
972 struct net_device
*dev
;
973 dev
= __dev_get_by_index(net
, n
->ifindex
);
974 if (dev
&& nla_put_string(skb
, TCA_U32_INDEV
, dev
->name
))
975 goto nla_put_failure
;
978 #ifdef CONFIG_CLS_U32_PERF
979 gpf
= kzalloc(sizeof(struct tc_u32_pcnt
) +
980 n
->sel
.nkeys
* sizeof(u64
),
983 goto nla_put_failure
;
985 for_each_possible_cpu(cpu
) {
987 struct tc_u32_pcnt
*pf
= per_cpu_ptr(n
->pf
, cpu
);
989 gpf
->rcnt
+= pf
->rcnt
;
990 gpf
->rhit
+= pf
->rhit
;
991 for (i
= 0; i
< n
->sel
.nkeys
; i
++)
992 gpf
->kcnts
[i
] += pf
->kcnts
[i
];
995 if (nla_put(skb
, TCA_U32_PCNT
,
996 sizeof(struct tc_u32_pcnt
) + n
->sel
.nkeys
*sizeof(u64
),
999 goto nla_put_failure
;
1005 nla_nest_end(skb
, nest
);
1007 if (TC_U32_KEY(n
->handle
))
1008 if (tcf_exts_dump_stats(skb
, &n
->exts
) < 0)
1009 goto nla_put_failure
;
1013 nla_nest_cancel(skb
, nest
);
1017 static struct tcf_proto_ops cls_u32_ops __read_mostly
= {
1019 .classify
= u32_classify
,
1021 .destroy
= u32_destroy
,
1023 .change
= u32_change
,
1024 .delete = u32_delete
,
1027 .owner
= THIS_MODULE
,
1030 static int __init
init_u32(void)
1032 pr_info("u32 classifier\n");
1033 #ifdef CONFIG_CLS_U32_PERF
1034 pr_info(" Performance counters on\n");
1036 #ifdef CONFIG_NET_CLS_IND
1037 pr_info(" input device check on\n");
1039 #ifdef CONFIG_NET_CLS_ACT
1040 pr_info(" Actions configured\n");
1042 return register_tcf_proto_ops(&cls_u32_ops
);
1045 static void __exit
exit_u32(void)
1047 unregister_tcf_proto_ops(&cls_u32_ops
);
1050 module_init(init_u32
)
1051 module_exit(exit_u32
)
1052 MODULE_LICENSE("GPL");