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 <linux/netdevice.h>
44 #include <linux/hash.h>
45 #include <net/netlink.h>
46 #include <net/act_api.h>
47 #include <net/pkt_cls.h>
48 #include <linux/netdevice.h>
49 #include <linux/idr.h>
52 struct tc_u_knode __rcu
*next
;
54 struct tc_u_hnode __rcu
*ht_up
;
56 #ifdef CONFIG_NET_CLS_IND
60 struct tcf_result res
;
61 struct tc_u_hnode __rcu
*ht_down
;
62 #ifdef CONFIG_CLS_U32_PERF
63 struct tc_u32_pcnt __percpu
*pf
;
66 #ifdef CONFIG_CLS_U32_MARK
69 u32 __percpu
*pcpu_success
;
73 struct work_struct work
;
76 /* The 'sel' field MUST be the last field in structure to allow for
77 * tc_u32_keys allocated at end of structure.
79 struct tc_u32_sel sel
;
83 struct tc_u_hnode __rcu
*next
;
86 struct tc_u_common
*tp_c
;
89 struct idr handle_idr
;
91 /* The 'ht' field MUST be the last field in structure to allow for
92 * more entries allocated at end of structure.
94 struct tc_u_knode __rcu
*ht
[1];
98 struct tc_u_hnode __rcu
*hlist
;
99 struct tcf_block
*block
;
101 struct idr handle_idr
;
102 struct hlist_node hnode
;
106 static inline unsigned int u32_hash_fold(__be32 key
,
107 const struct tc_u32_sel
*sel
,
110 unsigned int h
= ntohl(key
& sel
->hmask
) >> fshift
;
115 static int u32_classify(struct sk_buff
*skb
, const struct tcf_proto
*tp
,
116 struct tcf_result
*res
)
119 struct tc_u_knode
*knode
;
121 } stack
[TC_U32_MAXDEPTH
];
123 struct tc_u_hnode
*ht
= rcu_dereference_bh(tp
->root
);
124 unsigned int off
= skb_network_offset(skb
);
125 struct tc_u_knode
*n
;
129 #ifdef CONFIG_CLS_U32_PERF
135 n
= rcu_dereference_bh(ht
->ht
[sel
]);
139 struct tc_u32_key
*key
= n
->sel
.keys
;
141 #ifdef CONFIG_CLS_U32_PERF
142 __this_cpu_inc(n
->pf
->rcnt
);
146 if (tc_skip_sw(n
->flags
)) {
147 n
= rcu_dereference_bh(n
->next
);
151 #ifdef CONFIG_CLS_U32_MARK
152 if ((skb
->mark
& n
->mask
) != n
->val
) {
153 n
= rcu_dereference_bh(n
->next
);
156 __this_cpu_inc(*n
->pcpu_success
);
160 for (i
= n
->sel
.nkeys
; i
> 0; i
--, key
++) {
161 int toff
= off
+ key
->off
+ (off2
& key
->offmask
);
164 if (skb_headroom(skb
) + toff
> INT_MAX
)
167 data
= skb_header_pointer(skb
, toff
, 4, &hdata
);
170 if ((*data
^ key
->val
) & key
->mask
) {
171 n
= rcu_dereference_bh(n
->next
);
174 #ifdef CONFIG_CLS_U32_PERF
175 __this_cpu_inc(n
->pf
->kcnts
[j
]);
180 ht
= rcu_dereference_bh(n
->ht_down
);
183 if (n
->sel
.flags
& TC_U32_TERMINAL
) {
186 #ifdef CONFIG_NET_CLS_IND
187 if (!tcf_match_indev(skb
, n
->ifindex
)) {
188 n
= rcu_dereference_bh(n
->next
);
192 #ifdef CONFIG_CLS_U32_PERF
193 __this_cpu_inc(n
->pf
->rhit
);
195 r
= tcf_exts_exec(skb
, &n
->exts
, res
);
197 n
= rcu_dereference_bh(n
->next
);
203 n
= rcu_dereference_bh(n
->next
);
208 if (sdepth
>= TC_U32_MAXDEPTH
)
210 stack
[sdepth
].knode
= n
;
211 stack
[sdepth
].off
= off
;
214 ht
= rcu_dereference_bh(n
->ht_down
);
219 data
= skb_header_pointer(skb
, off
+ n
->sel
.hoff
, 4,
223 sel
= ht
->divisor
& u32_hash_fold(*data
, &n
->sel
,
226 if (!(n
->sel
.flags
& (TC_U32_VAROFFSET
| TC_U32_OFFSET
| TC_U32_EAT
)))
229 if (n
->sel
.flags
& (TC_U32_OFFSET
| TC_U32_VAROFFSET
)) {
230 off2
= n
->sel
.off
+ 3;
231 if (n
->sel
.flags
& TC_U32_VAROFFSET
) {
234 data
= skb_header_pointer(skb
,
239 off2
+= ntohs(n
->sel
.offmask
& *data
) >>
244 if (n
->sel
.flags
& TC_U32_EAT
) {
255 n
= stack
[sdepth
].knode
;
256 ht
= rcu_dereference_bh(n
->ht_up
);
257 off
= stack
[sdepth
].off
;
264 net_warn_ratelimited("cls_u32: dead loop\n");
268 static struct tc_u_hnode
*u32_lookup_ht(struct tc_u_common
*tp_c
, u32 handle
)
270 struct tc_u_hnode
*ht
;
272 for (ht
= rtnl_dereference(tp_c
->hlist
);
274 ht
= rtnl_dereference(ht
->next
))
275 if (ht
->handle
== handle
)
281 static struct tc_u_knode
*u32_lookup_key(struct tc_u_hnode
*ht
, u32 handle
)
284 struct tc_u_knode
*n
= NULL
;
286 sel
= TC_U32_HASH(handle
);
287 if (sel
> ht
->divisor
)
290 for (n
= rtnl_dereference(ht
->ht
[sel
]);
292 n
= rtnl_dereference(n
->next
))
293 if (n
->handle
== handle
)
300 static void *u32_get(struct tcf_proto
*tp
, u32 handle
)
302 struct tc_u_hnode
*ht
;
303 struct tc_u_common
*tp_c
= tp
->data
;
305 if (TC_U32_HTID(handle
) == TC_U32_ROOT
)
306 ht
= rtnl_dereference(tp
->root
);
308 ht
= u32_lookup_ht(tp_c
, TC_U32_HTID(handle
));
313 if (TC_U32_KEY(handle
) == 0)
316 return u32_lookup_key(ht
, handle
);
319 static u32
gen_new_htid(struct tc_u_common
*tp_c
, struct tc_u_hnode
*ptr
)
321 unsigned long idr_index
;
324 /* This is only used inside rtnl lock it is safe to increment
325 * without read _copy_ update semantics
327 err
= idr_alloc_ext(&tp_c
->handle_idr
, ptr
, &idr_index
,
328 1, 0x7FF, GFP_KERNEL
);
331 return (u32
)(idr_index
| 0x800) << 20;
334 static struct hlist_head
*tc_u_common_hash
;
336 #define U32_HASH_SHIFT 10
337 #define U32_HASH_SIZE (1 << U32_HASH_SHIFT)
339 static unsigned int tc_u_hash(const struct tcf_proto
*tp
)
341 return hash_ptr(tp
->chain
->block
, U32_HASH_SHIFT
);
344 static struct tc_u_common
*tc_u_common_find(const struct tcf_proto
*tp
)
346 struct tc_u_common
*tc
;
350 hlist_for_each_entry(tc
, &tc_u_common_hash
[h
], hnode
) {
351 if (tc
->block
== tp
->chain
->block
)
357 static int u32_init(struct tcf_proto
*tp
)
359 struct tc_u_hnode
*root_ht
;
360 struct tc_u_common
*tp_c
;
363 tp_c
= tc_u_common_find(tp
);
365 root_ht
= kzalloc(sizeof(*root_ht
), GFP_KERNEL
);
370 root_ht
->handle
= tp_c
? gen_new_htid(tp_c
, root_ht
) : 0x80000000;
371 root_ht
->prio
= tp
->prio
;
372 idr_init(&root_ht
->handle_idr
);
375 tp_c
= kzalloc(sizeof(*tp_c
), GFP_KERNEL
);
380 tp_c
->block
= tp
->chain
->block
;
381 INIT_HLIST_NODE(&tp_c
->hnode
);
382 idr_init(&tp_c
->handle_idr
);
385 hlist_add_head(&tp_c
->hnode
, &tc_u_common_hash
[h
]);
389 RCU_INIT_POINTER(root_ht
->next
, tp_c
->hlist
);
390 rcu_assign_pointer(tp_c
->hlist
, root_ht
);
391 root_ht
->tp_c
= tp_c
;
393 rcu_assign_pointer(tp
->root
, root_ht
);
398 static int u32_destroy_key(struct tcf_proto
*tp
, struct tc_u_knode
*n
,
401 tcf_exts_destroy(&n
->exts
);
402 tcf_exts_put_net(&n
->exts
);
404 n
->ht_down
->refcnt
--;
405 #ifdef CONFIG_CLS_U32_PERF
409 #ifdef CONFIG_CLS_U32_MARK
411 free_percpu(n
->pcpu_success
);
417 /* u32_delete_key_rcu should be called when free'ing a copied
418 * version of a tc_u_knode obtained from u32_init_knode(). When
419 * copies are obtained from u32_init_knode() the statistics are
420 * shared between the old and new copies to allow readers to
421 * continue to update the statistics during the copy. To support
422 * this the u32_delete_key_rcu variant does not free the percpu
425 static void u32_delete_key_work(struct work_struct
*work
)
427 struct tc_u_knode
*key
= container_of(work
, struct tc_u_knode
, work
);
430 u32_destroy_key(key
->tp
, key
, false);
434 static void u32_delete_key_rcu(struct rcu_head
*rcu
)
436 struct tc_u_knode
*key
= container_of(rcu
, struct tc_u_knode
, rcu
);
438 INIT_WORK(&key
->work
, u32_delete_key_work
);
439 tcf_queue_work(&key
->work
);
442 /* u32_delete_key_freepf_rcu is the rcu callback variant
443 * that free's the entire structure including the statistics
444 * percpu variables. Only use this if the key is not a copy
445 * returned by u32_init_knode(). See u32_delete_key_rcu()
446 * for the variant that should be used with keys return from
449 static void u32_delete_key_freepf_work(struct work_struct
*work
)
451 struct tc_u_knode
*key
= container_of(work
, struct tc_u_knode
, work
);
454 u32_destroy_key(key
->tp
, key
, true);
458 static void u32_delete_key_freepf_rcu(struct rcu_head
*rcu
)
460 struct tc_u_knode
*key
= container_of(rcu
, struct tc_u_knode
, rcu
);
462 INIT_WORK(&key
->work
, u32_delete_key_freepf_work
);
463 tcf_queue_work(&key
->work
);
466 static int u32_delete_key(struct tcf_proto
*tp
, struct tc_u_knode
*key
)
468 struct tc_u_knode __rcu
**kp
;
469 struct tc_u_knode
*pkp
;
470 struct tc_u_hnode
*ht
= rtnl_dereference(key
->ht_up
);
473 kp
= &ht
->ht
[TC_U32_HASH(key
->handle
)];
474 for (pkp
= rtnl_dereference(*kp
); pkp
;
475 kp
= &pkp
->next
, pkp
= rtnl_dereference(*kp
)) {
477 RCU_INIT_POINTER(*kp
, key
->next
);
479 tcf_unbind_filter(tp
, &key
->res
);
480 tcf_exts_get_net(&key
->exts
);
481 call_rcu(&key
->rcu
, u32_delete_key_freepf_rcu
);
490 static void u32_clear_hw_hnode(struct tcf_proto
*tp
, struct tc_u_hnode
*h
)
492 struct tcf_block
*block
= tp
->chain
->block
;
493 struct tc_cls_u32_offload cls_u32
= {};
495 tc_cls_common_offload_init(&cls_u32
.common
, tp
);
496 cls_u32
.command
= TC_CLSU32_DELETE_HNODE
;
497 cls_u32
.hnode
.divisor
= h
->divisor
;
498 cls_u32
.hnode
.handle
= h
->handle
;
499 cls_u32
.hnode
.prio
= h
->prio
;
501 tc_setup_cb_call(block
, NULL
, TC_SETUP_CLSU32
, &cls_u32
, false);
504 static int u32_replace_hw_hnode(struct tcf_proto
*tp
, struct tc_u_hnode
*h
,
507 struct tcf_block
*block
= tp
->chain
->block
;
508 struct tc_cls_u32_offload cls_u32
= {};
509 bool skip_sw
= tc_skip_sw(flags
);
510 bool offloaded
= false;
513 tc_cls_common_offload_init(&cls_u32
.common
, tp
);
514 cls_u32
.command
= TC_CLSU32_NEW_HNODE
;
515 cls_u32
.hnode
.divisor
= h
->divisor
;
516 cls_u32
.hnode
.handle
= h
->handle
;
517 cls_u32
.hnode
.prio
= h
->prio
;
519 err
= tc_setup_cb_call(block
, NULL
, TC_SETUP_CLSU32
, &cls_u32
, skip_sw
);
521 u32_clear_hw_hnode(tp
, h
);
523 } else if (err
> 0) {
527 if (skip_sw
&& !offloaded
)
533 static void u32_remove_hw_knode(struct tcf_proto
*tp
, u32 handle
)
535 struct tcf_block
*block
= tp
->chain
->block
;
536 struct tc_cls_u32_offload cls_u32
= {};
538 tc_cls_common_offload_init(&cls_u32
.common
, tp
);
539 cls_u32
.command
= TC_CLSU32_DELETE_KNODE
;
540 cls_u32
.knode
.handle
= handle
;
542 tc_setup_cb_call(block
, NULL
, TC_SETUP_CLSU32
, &cls_u32
, false);
545 static int u32_replace_hw_knode(struct tcf_proto
*tp
, struct tc_u_knode
*n
,
548 struct tcf_block
*block
= tp
->chain
->block
;
549 struct tc_cls_u32_offload cls_u32
= {};
550 bool skip_sw
= tc_skip_sw(flags
);
553 tc_cls_common_offload_init(&cls_u32
.common
, tp
);
554 cls_u32
.command
= TC_CLSU32_REPLACE_KNODE
;
555 cls_u32
.knode
.handle
= n
->handle
;
556 cls_u32
.knode
.fshift
= n
->fshift
;
557 #ifdef CONFIG_CLS_U32_MARK
558 cls_u32
.knode
.val
= n
->val
;
559 cls_u32
.knode
.mask
= n
->mask
;
561 cls_u32
.knode
.val
= 0;
562 cls_u32
.knode
.mask
= 0;
564 cls_u32
.knode
.sel
= &n
->sel
;
565 cls_u32
.knode
.exts
= &n
->exts
;
567 cls_u32
.knode
.link_handle
= n
->ht_down
->handle
;
569 err
= tc_setup_cb_call(block
, NULL
, TC_SETUP_CLSU32
, &cls_u32
, skip_sw
);
571 u32_remove_hw_knode(tp
, n
->handle
);
573 } else if (err
> 0) {
574 n
->flags
|= TCA_CLS_FLAGS_IN_HW
;
577 if (skip_sw
&& !(n
->flags
& TCA_CLS_FLAGS_IN_HW
))
583 static void u32_clear_hnode(struct tcf_proto
*tp
, struct tc_u_hnode
*ht
)
585 struct tc_u_knode
*n
;
588 for (h
= 0; h
<= ht
->divisor
; h
++) {
589 while ((n
= rtnl_dereference(ht
->ht
[h
])) != NULL
) {
590 RCU_INIT_POINTER(ht
->ht
[h
],
591 rtnl_dereference(n
->next
));
592 tcf_unbind_filter(tp
, &n
->res
);
593 u32_remove_hw_knode(tp
, n
->handle
);
594 idr_remove_ext(&ht
->handle_idr
, n
->handle
);
595 if (tcf_exts_get_net(&n
->exts
))
596 call_rcu(&n
->rcu
, u32_delete_key_freepf_rcu
);
598 u32_destroy_key(n
->tp
, n
, true);
603 static int u32_destroy_hnode(struct tcf_proto
*tp
, struct tc_u_hnode
*ht
)
605 struct tc_u_common
*tp_c
= tp
->data
;
606 struct tc_u_hnode __rcu
**hn
;
607 struct tc_u_hnode
*phn
;
611 u32_clear_hnode(tp
, ht
);
614 for (phn
= rtnl_dereference(*hn
);
616 hn
= &phn
->next
, phn
= rtnl_dereference(*hn
)) {
618 u32_clear_hw_hnode(tp
, ht
);
619 idr_destroy(&ht
->handle_idr
);
620 idr_remove_ext(&tp_c
->handle_idr
, ht
->handle
);
621 RCU_INIT_POINTER(*hn
, ht
->next
);
630 static bool ht_empty(struct tc_u_hnode
*ht
)
634 for (h
= 0; h
<= ht
->divisor
; h
++)
635 if (rcu_access_pointer(ht
->ht
[h
]))
641 static void u32_destroy(struct tcf_proto
*tp
)
643 struct tc_u_common
*tp_c
= tp
->data
;
644 struct tc_u_hnode
*root_ht
= rtnl_dereference(tp
->root
);
646 WARN_ON(root_ht
== NULL
);
648 if (root_ht
&& --root_ht
->refcnt
== 0)
649 u32_destroy_hnode(tp
, root_ht
);
651 if (--tp_c
->refcnt
== 0) {
652 struct tc_u_hnode
*ht
;
654 hlist_del(&tp_c
->hnode
);
656 for (ht
= rtnl_dereference(tp_c
->hlist
);
658 ht
= rtnl_dereference(ht
->next
)) {
660 u32_clear_hnode(tp
, ht
);
663 while ((ht
= rtnl_dereference(tp_c
->hlist
)) != NULL
) {
664 RCU_INIT_POINTER(tp_c
->hlist
, ht
->next
);
668 idr_destroy(&tp_c
->handle_idr
);
675 static int u32_delete(struct tcf_proto
*tp
, void *arg
, bool *last
)
677 struct tc_u_hnode
*ht
= arg
;
678 struct tc_u_hnode
*root_ht
= rtnl_dereference(tp
->root
);
679 struct tc_u_common
*tp_c
= tp
->data
;
685 if (TC_U32_KEY(ht
->handle
)) {
686 u32_remove_hw_knode(tp
, ht
->handle
);
687 ret
= u32_delete_key(tp
, (struct tc_u_knode
*)ht
);
694 if (ht
->refcnt
== 1) {
696 u32_destroy_hnode(tp
, ht
);
704 if (root_ht
->refcnt
> 1) {
708 if (root_ht
->refcnt
== 1) {
709 if (!ht_empty(root_ht
)) {
716 if (tp_c
->refcnt
> 1) {
721 if (tp_c
->refcnt
== 1) {
722 struct tc_u_hnode
*ht
;
724 for (ht
= rtnl_dereference(tp_c
->hlist
);
726 ht
= rtnl_dereference(ht
->next
))
737 static u32
gen_new_kid(struct tc_u_hnode
*ht
, u32 htid
)
739 unsigned long idr_index
;
740 u32 start
= htid
| 0x800;
741 u32 max
= htid
| 0xFFF;
744 if (idr_alloc_ext(&ht
->handle_idr
, NULL
, &idr_index
,
745 start
, max
+ 1, GFP_KERNEL
)) {
746 if (idr_alloc_ext(&ht
->handle_idr
, NULL
, &idr_index
,
747 min
+ 1, max
+ 1, GFP_KERNEL
))
751 return (u32
)idr_index
;
754 static const struct nla_policy u32_policy
[TCA_U32_MAX
+ 1] = {
755 [TCA_U32_CLASSID
] = { .type
= NLA_U32
},
756 [TCA_U32_HASH
] = { .type
= NLA_U32
},
757 [TCA_U32_LINK
] = { .type
= NLA_U32
},
758 [TCA_U32_DIVISOR
] = { .type
= NLA_U32
},
759 [TCA_U32_SEL
] = { .len
= sizeof(struct tc_u32_sel
) },
760 [TCA_U32_INDEV
] = { .type
= NLA_STRING
, .len
= IFNAMSIZ
},
761 [TCA_U32_MARK
] = { .len
= sizeof(struct tc_u32_mark
) },
762 [TCA_U32_FLAGS
] = { .type
= NLA_U32
},
765 static int u32_set_parms(struct net
*net
, struct tcf_proto
*tp
,
766 unsigned long base
, struct tc_u_hnode
*ht
,
767 struct tc_u_knode
*n
, struct nlattr
**tb
,
768 struct nlattr
*est
, bool ovr
)
772 err
= tcf_exts_validate(net
, tp
, tb
, est
, &n
->exts
, ovr
);
776 if (tb
[TCA_U32_LINK
]) {
777 u32 handle
= nla_get_u32(tb
[TCA_U32_LINK
]);
778 struct tc_u_hnode
*ht_down
= NULL
, *ht_old
;
780 if (TC_U32_KEY(handle
))
784 ht_down
= u32_lookup_ht(ht
->tp_c
, handle
);
791 ht_old
= rtnl_dereference(n
->ht_down
);
792 rcu_assign_pointer(n
->ht_down
, ht_down
);
797 if (tb
[TCA_U32_CLASSID
]) {
798 n
->res
.classid
= nla_get_u32(tb
[TCA_U32_CLASSID
]);
799 tcf_bind_filter(tp
, &n
->res
, base
);
802 #ifdef CONFIG_NET_CLS_IND
803 if (tb
[TCA_U32_INDEV
]) {
805 ret
= tcf_change_indev(net
, tb
[TCA_U32_INDEV
]);
814 static void u32_replace_knode(struct tcf_proto
*tp
, struct tc_u_common
*tp_c
,
815 struct tc_u_knode
*n
)
817 struct tc_u_knode __rcu
**ins
;
818 struct tc_u_knode
*pins
;
819 struct tc_u_hnode
*ht
;
821 if (TC_U32_HTID(n
->handle
) == TC_U32_ROOT
)
822 ht
= rtnl_dereference(tp
->root
);
824 ht
= u32_lookup_ht(tp_c
, TC_U32_HTID(n
->handle
));
826 ins
= &ht
->ht
[TC_U32_HASH(n
->handle
)];
828 /* The node must always exist for it to be replaced if this is not the
829 * case then something went very wrong elsewhere.
831 for (pins
= rtnl_dereference(*ins
); ;
832 ins
= &pins
->next
, pins
= rtnl_dereference(*ins
))
833 if (pins
->handle
== n
->handle
)
836 idr_replace_ext(&ht
->handle_idr
, n
, n
->handle
);
837 RCU_INIT_POINTER(n
->next
, pins
->next
);
838 rcu_assign_pointer(*ins
, n
);
841 static struct tc_u_knode
*u32_init_knode(struct tcf_proto
*tp
,
842 struct tc_u_knode
*n
)
844 struct tc_u_knode
*new;
845 struct tc_u32_sel
*s
= &n
->sel
;
847 new = kzalloc(sizeof(*n
) + s
->nkeys
*sizeof(struct tc_u32_key
),
853 RCU_INIT_POINTER(new->next
, n
->next
);
854 new->handle
= n
->handle
;
855 RCU_INIT_POINTER(new->ht_up
, n
->ht_up
);
857 #ifdef CONFIG_NET_CLS_IND
858 new->ifindex
= n
->ifindex
;
860 new->fshift
= n
->fshift
;
862 new->flags
= n
->flags
;
863 RCU_INIT_POINTER(new->ht_down
, n
->ht_down
);
865 /* bump reference count as long as we hold pointer to structure */
867 new->ht_down
->refcnt
++;
869 #ifdef CONFIG_CLS_U32_PERF
870 /* Statistics may be incremented by readers during update
871 * so we must keep them in tact. When the node is later destroyed
872 * a special destroy call must be made to not free the pf memory.
877 #ifdef CONFIG_CLS_U32_MARK
880 /* Similarly success statistics must be moved as pointers */
881 new->pcpu_success
= n
->pcpu_success
;
884 memcpy(&new->sel
, s
, sizeof(*s
) + s
->nkeys
*sizeof(struct tc_u32_key
));
886 if (tcf_exts_init(&new->exts
, TCA_U32_ACT
, TCA_U32_POLICE
)) {
894 static int u32_change(struct net
*net
, struct sk_buff
*in_skb
,
895 struct tcf_proto
*tp
, unsigned long base
, u32 handle
,
896 struct nlattr
**tca
, void **arg
, bool ovr
)
898 struct tc_u_common
*tp_c
= tp
->data
;
899 struct tc_u_hnode
*ht
;
900 struct tc_u_knode
*n
;
901 struct tc_u32_sel
*s
;
902 struct nlattr
*opt
= tca
[TCA_OPTIONS
];
903 struct nlattr
*tb
[TCA_U32_MAX
+ 1];
906 #ifdef CONFIG_CLS_U32_PERF
911 return handle
? -EINVAL
: 0;
913 err
= nla_parse_nested(tb
, TCA_U32_MAX
, opt
, u32_policy
, NULL
);
917 if (tb
[TCA_U32_FLAGS
]) {
918 flags
= nla_get_u32(tb
[TCA_U32_FLAGS
]);
919 if (!tc_flags_valid(flags
))
925 struct tc_u_knode
*new;
927 if (TC_U32_KEY(n
->handle
) == 0)
930 if (n
->flags
!= flags
)
933 new = u32_init_knode(tp
, n
);
937 err
= u32_set_parms(net
, tp
, base
,
938 rtnl_dereference(n
->ht_up
), new, tb
,
942 u32_destroy_key(tp
, new, false);
946 err
= u32_replace_hw_knode(tp
, new, flags
);
948 u32_destroy_key(tp
, new, false);
952 if (!tc_in_hw(new->flags
))
953 new->flags
|= TCA_CLS_FLAGS_NOT_IN_HW
;
955 u32_replace_knode(tp
, tp_c
, new);
956 tcf_unbind_filter(tp
, &n
->res
);
957 tcf_exts_get_net(&n
->exts
);
958 call_rcu(&n
->rcu
, u32_delete_key_rcu
);
962 if (tb
[TCA_U32_DIVISOR
]) {
963 unsigned int divisor
= nla_get_u32(tb
[TCA_U32_DIVISOR
]);
965 if (--divisor
> 0x100)
967 if (TC_U32_KEY(handle
))
969 ht
= kzalloc(sizeof(*ht
) + divisor
*sizeof(void *), GFP_KERNEL
);
973 handle
= gen_new_htid(tp
->data
, ht
);
979 err
= idr_alloc_ext(&tp_c
->handle_idr
, ht
, NULL
,
980 handle
, handle
+ 1, GFP_KERNEL
);
988 ht
->divisor
= divisor
;
991 idr_init(&ht
->handle_idr
);
993 err
= u32_replace_hw_hnode(tp
, ht
, flags
);
995 idr_remove_ext(&tp_c
->handle_idr
, handle
);
1000 RCU_INIT_POINTER(ht
->next
, tp_c
->hlist
);
1001 rcu_assign_pointer(tp_c
->hlist
, ht
);
1007 if (tb
[TCA_U32_HASH
]) {
1008 htid
= nla_get_u32(tb
[TCA_U32_HASH
]);
1009 if (TC_U32_HTID(htid
) == TC_U32_ROOT
) {
1010 ht
= rtnl_dereference(tp
->root
);
1013 ht
= u32_lookup_ht(tp
->data
, TC_U32_HTID(htid
));
1018 ht
= rtnl_dereference(tp
->root
);
1022 if (ht
->divisor
< TC_U32_HASH(htid
))
1026 if (TC_U32_HTID(handle
) && TC_U32_HTID(handle
^htid
))
1028 handle
= htid
| TC_U32_NODE(handle
);
1029 err
= idr_alloc_ext(&ht
->handle_idr
, NULL
, NULL
,
1035 handle
= gen_new_kid(ht
, htid
);
1037 if (tb
[TCA_U32_SEL
] == NULL
) {
1042 s
= nla_data(tb
[TCA_U32_SEL
]);
1044 n
= kzalloc(sizeof(*n
) + s
->nkeys
*sizeof(struct tc_u32_key
), GFP_KERNEL
);
1050 #ifdef CONFIG_CLS_U32_PERF
1051 size
= sizeof(struct tc_u32_pcnt
) + s
->nkeys
* sizeof(u64
);
1052 n
->pf
= __alloc_percpu(size
, __alignof__(struct tc_u32_pcnt
));
1059 memcpy(&n
->sel
, s
, sizeof(*s
) + s
->nkeys
*sizeof(struct tc_u32_key
));
1060 RCU_INIT_POINTER(n
->ht_up
, ht
);
1062 n
->fshift
= s
->hmask
? ffs(ntohl(s
->hmask
)) - 1 : 0;
1066 err
= tcf_exts_init(&n
->exts
, TCA_U32_ACT
, TCA_U32_POLICE
);
1070 #ifdef CONFIG_CLS_U32_MARK
1071 n
->pcpu_success
= alloc_percpu(u32
);
1072 if (!n
->pcpu_success
) {
1077 if (tb
[TCA_U32_MARK
]) {
1078 struct tc_u32_mark
*mark
;
1080 mark
= nla_data(tb
[TCA_U32_MARK
]);
1082 n
->mask
= mark
->mask
;
1086 err
= u32_set_parms(net
, tp
, base
, ht
, n
, tb
, tca
[TCA_RATE
], ovr
);
1088 struct tc_u_knode __rcu
**ins
;
1089 struct tc_u_knode
*pins
;
1091 err
= u32_replace_hw_knode(tp
, n
, flags
);
1095 if (!tc_in_hw(n
->flags
))
1096 n
->flags
|= TCA_CLS_FLAGS_NOT_IN_HW
;
1098 ins
= &ht
->ht
[TC_U32_HASH(handle
)];
1099 for (pins
= rtnl_dereference(*ins
); pins
;
1100 ins
= &pins
->next
, pins
= rtnl_dereference(*ins
))
1101 if (TC_U32_NODE(handle
) < TC_U32_NODE(pins
->handle
))
1104 RCU_INIT_POINTER(n
->next
, pins
);
1105 rcu_assign_pointer(*ins
, n
);
1111 #ifdef CONFIG_CLS_U32_MARK
1112 free_percpu(n
->pcpu_success
);
1116 tcf_exts_destroy(&n
->exts
);
1117 #ifdef CONFIG_CLS_U32_PERF
1123 idr_remove_ext(&ht
->handle_idr
, handle
);
1127 static void u32_walk(struct tcf_proto
*tp
, struct tcf_walker
*arg
)
1129 struct tc_u_common
*tp_c
= tp
->data
;
1130 struct tc_u_hnode
*ht
;
1131 struct tc_u_knode
*n
;
1137 for (ht
= rtnl_dereference(tp_c
->hlist
);
1139 ht
= rtnl_dereference(ht
->next
)) {
1140 if (ht
->prio
!= tp
->prio
)
1142 if (arg
->count
>= arg
->skip
) {
1143 if (arg
->fn(tp
, ht
, arg
) < 0) {
1149 for (h
= 0; h
<= ht
->divisor
; h
++) {
1150 for (n
= rtnl_dereference(ht
->ht
[h
]);
1152 n
= rtnl_dereference(n
->next
)) {
1153 if (arg
->count
< arg
->skip
) {
1157 if (arg
->fn(tp
, n
, arg
) < 0) {
1167 static void u32_bind_class(void *fh
, u32 classid
, unsigned long cl
)
1169 struct tc_u_knode
*n
= fh
;
1171 if (n
&& n
->res
.classid
== classid
)
1175 static int u32_dump(struct net
*net
, struct tcf_proto
*tp
, void *fh
,
1176 struct sk_buff
*skb
, struct tcmsg
*t
)
1178 struct tc_u_knode
*n
= fh
;
1179 struct tc_u_hnode
*ht_up
, *ht_down
;
1180 struct nlattr
*nest
;
1185 t
->tcm_handle
= n
->handle
;
1187 nest
= nla_nest_start(skb
, TCA_OPTIONS
);
1189 goto nla_put_failure
;
1191 if (TC_U32_KEY(n
->handle
) == 0) {
1192 struct tc_u_hnode
*ht
= fh
;
1193 u32 divisor
= ht
->divisor
+ 1;
1195 if (nla_put_u32(skb
, TCA_U32_DIVISOR
, divisor
))
1196 goto nla_put_failure
;
1198 #ifdef CONFIG_CLS_U32_PERF
1199 struct tc_u32_pcnt
*gpf
;
1203 if (nla_put(skb
, TCA_U32_SEL
,
1204 sizeof(n
->sel
) + n
->sel
.nkeys
*sizeof(struct tc_u32_key
),
1206 goto nla_put_failure
;
1208 ht_up
= rtnl_dereference(n
->ht_up
);
1210 u32 htid
= n
->handle
& 0xFFFFF000;
1211 if (nla_put_u32(skb
, TCA_U32_HASH
, htid
))
1212 goto nla_put_failure
;
1214 if (n
->res
.classid
&&
1215 nla_put_u32(skb
, TCA_U32_CLASSID
, n
->res
.classid
))
1216 goto nla_put_failure
;
1218 ht_down
= rtnl_dereference(n
->ht_down
);
1220 nla_put_u32(skb
, TCA_U32_LINK
, ht_down
->handle
))
1221 goto nla_put_failure
;
1223 if (n
->flags
&& nla_put_u32(skb
, TCA_U32_FLAGS
, n
->flags
))
1224 goto nla_put_failure
;
1226 #ifdef CONFIG_CLS_U32_MARK
1227 if ((n
->val
|| n
->mask
)) {
1228 struct tc_u32_mark mark
= {.val
= n
->val
,
1233 for_each_possible_cpu(cpum
) {
1234 __u32 cnt
= *per_cpu_ptr(n
->pcpu_success
, cpum
);
1236 mark
.success
+= cnt
;
1239 if (nla_put(skb
, TCA_U32_MARK
, sizeof(mark
), &mark
))
1240 goto nla_put_failure
;
1244 if (tcf_exts_dump(skb
, &n
->exts
) < 0)
1245 goto nla_put_failure
;
1247 #ifdef CONFIG_NET_CLS_IND
1249 struct net_device
*dev
;
1250 dev
= __dev_get_by_index(net
, n
->ifindex
);
1251 if (dev
&& nla_put_string(skb
, TCA_U32_INDEV
, dev
->name
))
1252 goto nla_put_failure
;
1255 #ifdef CONFIG_CLS_U32_PERF
1256 gpf
= kzalloc(sizeof(struct tc_u32_pcnt
) +
1257 n
->sel
.nkeys
* sizeof(u64
),
1260 goto nla_put_failure
;
1262 for_each_possible_cpu(cpu
) {
1264 struct tc_u32_pcnt
*pf
= per_cpu_ptr(n
->pf
, cpu
);
1266 gpf
->rcnt
+= pf
->rcnt
;
1267 gpf
->rhit
+= pf
->rhit
;
1268 for (i
= 0; i
< n
->sel
.nkeys
; i
++)
1269 gpf
->kcnts
[i
] += pf
->kcnts
[i
];
1272 if (nla_put_64bit(skb
, TCA_U32_PCNT
,
1273 sizeof(struct tc_u32_pcnt
) +
1274 n
->sel
.nkeys
* sizeof(u64
),
1275 gpf
, TCA_U32_PAD
)) {
1277 goto nla_put_failure
;
1283 nla_nest_end(skb
, nest
);
1285 if (TC_U32_KEY(n
->handle
))
1286 if (tcf_exts_dump_stats(skb
, &n
->exts
) < 0)
1287 goto nla_put_failure
;
1291 nla_nest_cancel(skb
, nest
);
1295 static struct tcf_proto_ops cls_u32_ops __read_mostly
= {
1297 .classify
= u32_classify
,
1299 .destroy
= u32_destroy
,
1301 .change
= u32_change
,
1302 .delete = u32_delete
,
1305 .bind_class
= u32_bind_class
,
1306 .owner
= THIS_MODULE
,
1309 static int __init
init_u32(void)
1313 pr_info("u32 classifier\n");
1314 #ifdef CONFIG_CLS_U32_PERF
1315 pr_info(" Performance counters on\n");
1317 #ifdef CONFIG_NET_CLS_IND
1318 pr_info(" input device check on\n");
1320 #ifdef CONFIG_NET_CLS_ACT
1321 pr_info(" Actions configured\n");
1323 tc_u_common_hash
= kvmalloc_array(U32_HASH_SIZE
,
1324 sizeof(struct hlist_head
),
1326 if (!tc_u_common_hash
)
1329 for (i
= 0; i
< U32_HASH_SIZE
; i
++)
1330 INIT_HLIST_HEAD(&tc_u_common_hash
[i
]);
1332 ret
= register_tcf_proto_ops(&cls_u32_ops
);
1334 kvfree(tc_u_common_hash
);
1338 static void __exit
exit_u32(void)
1340 unregister_tcf_proto_ops(&cls_u32_ops
);
1341 kvfree(tc_u_common_hash
);
1344 module_init(init_u32
)
1345 module_exit(exit_u32
)
1346 MODULE_LICENSE("GPL");