1 /* net/sched/sch_dsmark.c - Differentiated Services field marker */
3 /* Written 1998-2000 by Werner Almesberger, EPFL ICA */
6 #include <linux/module.h>
7 #include <linux/init.h>
8 #include <linux/types.h>
9 #include <linux/string.h>
10 #include <linux/errno.h>
11 #include <linux/skbuff.h>
12 #include <linux/rtnetlink.h>
13 #include <linux/bitops.h>
14 #include <net/pkt_sched.h>
15 #include <net/dsfield.h>
16 #include <net/inet_ecn.h>
17 #include <asm/byteorder.h>
20 * classid class marking
21 * ------- ----- -------
25 * x:y y>0 y+1 use entry [y]
27 * x:indices-1 indices use entry [indices-1]
29 * x:y y+1 use entry [y & (indices-1)]
31 * 0xffff 0x10000 use entry [indices-1]
35 #define NO_DEFAULT_INDEX (1 << 16)
37 struct dsmark_qdisc_data
{
39 struct tcf_proto
*filter_list
;
40 u8
*mask
; /* "owns" the array */
43 u32 default_index
; /* index range is 0...0xffff */
47 static inline int dsmark_valid_index(struct dsmark_qdisc_data
*p
, u16 index
)
49 return (index
<= p
->indices
&& index
> 0);
52 /* ------------------------- Class/flow operations ------------------------- */
54 static int dsmark_graft(struct Qdisc
*sch
, unsigned long arg
,
55 struct Qdisc
*new, struct Qdisc
**old
)
57 struct dsmark_qdisc_data
*p
= qdisc_priv(sch
);
59 pr_debug("dsmark_graft(sch %p,[qdisc %p],new %p,old %p)\n",
63 new = qdisc_create_dflt(sch
->dev
, &pfifo_qdisc_ops
,
70 *old
= xchg(&p
->q
, new);
71 qdisc_tree_decrease_qlen(*old
, (*old
)->q
.qlen
);
78 static struct Qdisc
*dsmark_leaf(struct Qdisc
*sch
, unsigned long arg
)
80 struct dsmark_qdisc_data
*p
= qdisc_priv(sch
);
84 static unsigned long dsmark_get(struct Qdisc
*sch
, u32 classid
)
86 pr_debug("dsmark_get(sch %p,[qdisc %p],classid %x)\n",
87 sch
, qdisc_priv(sch
), classid
);
89 return TC_H_MIN(classid
) + 1;
92 static unsigned long dsmark_bind_filter(struct Qdisc
*sch
,
93 unsigned long parent
, u32 classid
)
95 return dsmark_get(sch
, classid
);
98 static void dsmark_put(struct Qdisc
*sch
, unsigned long cl
)
102 static int dsmark_change(struct Qdisc
*sch
, u32 classid
, u32 parent
,
103 struct rtattr
**tca
, unsigned long *arg
)
105 struct dsmark_qdisc_data
*p
= qdisc_priv(sch
);
106 struct rtattr
*opt
= tca
[TCA_OPTIONS
-1];
107 struct rtattr
*tb
[TCA_DSMARK_MAX
];
111 pr_debug("dsmark_change(sch %p,[qdisc %p],classid %x,parent %x),"
112 "arg 0x%lx\n", sch
, p
, classid
, parent
, *arg
);
114 if (!dsmark_valid_index(p
, *arg
)) {
119 if (!opt
|| rtattr_parse_nested(tb
, TCA_DSMARK_MAX
, opt
))
122 if (tb
[TCA_DSMARK_MASK
-1])
123 mask
= RTA_GET_U8(tb
[TCA_DSMARK_MASK
-1]);
125 if (tb
[TCA_DSMARK_VALUE
-1])
126 p
->value
[*arg
-1] = RTA_GET_U8(tb
[TCA_DSMARK_VALUE
-1]);
128 if (tb
[TCA_DSMARK_MASK
-1])
129 p
->mask
[*arg
-1] = mask
;
137 static int dsmark_delete(struct Qdisc
*sch
, unsigned long arg
)
139 struct dsmark_qdisc_data
*p
= qdisc_priv(sch
);
141 if (!dsmark_valid_index(p
, arg
))
144 p
->mask
[arg
-1] = 0xff;
150 static void dsmark_walk(struct Qdisc
*sch
, struct qdisc_walker
*walker
)
152 struct dsmark_qdisc_data
*p
= qdisc_priv(sch
);
155 pr_debug("dsmark_walk(sch %p,[qdisc %p],walker %p)\n", sch
, p
, walker
);
160 for (i
= 0; i
< p
->indices
; i
++) {
161 if (p
->mask
[i
] == 0xff && !p
->value
[i
])
163 if (walker
->count
>= walker
->skip
) {
164 if (walker
->fn(sch
, i
+1, walker
) < 0) {
174 static inline struct tcf_proto
**dsmark_find_tcf(struct Qdisc
*sch
,
177 struct dsmark_qdisc_data
*p
= qdisc_priv(sch
);
178 return &p
->filter_list
;
181 /* --------------------------- Qdisc operations ---------------------------- */
183 static int dsmark_enqueue(struct sk_buff
*skb
, struct Qdisc
*sch
)
185 struct dsmark_qdisc_data
*p
= qdisc_priv(sch
);
188 pr_debug("dsmark_enqueue(skb %p,sch %p,[qdisc %p])\n", skb
, sch
, p
);
190 if (p
->set_tc_index
) {
191 switch (skb
->protocol
) {
192 case __constant_htons(ETH_P_IP
):
193 if (skb_cow_head(skb
, sizeof(struct iphdr
)))
196 skb
->tc_index
= ipv4_get_dsfield(ip_hdr(skb
))
200 case __constant_htons(ETH_P_IPV6
):
201 if (skb_cow_head(skb
, sizeof(struct ipv6hdr
)))
204 skb
->tc_index
= ipv6_get_dsfield(ipv6_hdr(skb
))
213 if (TC_H_MAJ(skb
->priority
) == sch
->handle
)
214 skb
->tc_index
= TC_H_MIN(skb
->priority
);
216 struct tcf_result res
;
217 int result
= tc_classify(skb
, p
->filter_list
, &res
);
219 pr_debug("result %d class 0x%04x\n", result
, res
.classid
);
222 #ifdef CONFIG_NET_CLS_ACT
226 return NET_XMIT_SUCCESS
;
232 skb
->tc_index
= TC_H_MIN(res
.classid
);
236 if (p
->default_index
!= NO_DEFAULT_INDEX
)
237 skb
->tc_index
= p
->default_index
;
242 err
= p
->q
->enqueue(skb
, p
->q
);
243 if (err
!= NET_XMIT_SUCCESS
) {
248 sch
->bstats
.bytes
+= skb
->len
;
249 sch
->bstats
.packets
++;
252 return NET_XMIT_SUCCESS
;
257 return NET_XMIT_BYPASS
;
260 static struct sk_buff
*dsmark_dequeue(struct Qdisc
*sch
)
262 struct dsmark_qdisc_data
*p
= qdisc_priv(sch
);
266 pr_debug("dsmark_dequeue(sch %p,[qdisc %p])\n", sch
, p
);
268 skb
= p
->q
->ops
->dequeue(p
->q
);
274 index
= skb
->tc_index
& (p
->indices
- 1);
275 pr_debug("index %d->%d\n", skb
->tc_index
, index
);
277 switch (skb
->protocol
) {
278 case __constant_htons(ETH_P_IP
):
279 ipv4_change_dsfield(ip_hdr(skb
), p
->mask
[index
],
282 case __constant_htons(ETH_P_IPV6
):
283 ipv6_change_dsfield(ipv6_hdr(skb
), p
->mask
[index
],
288 * Only complain if a change was actually attempted.
289 * This way, we can send non-IP traffic through dsmark
290 * and don't need yet another qdisc as a bypass.
292 if (p
->mask
[index
] != 0xff || p
->value
[index
])
294 "dsmark_dequeue: unsupported protocol %d\n",
295 ntohs(skb
->protocol
));
302 static int dsmark_requeue(struct sk_buff
*skb
, struct Qdisc
*sch
)
304 struct dsmark_qdisc_data
*p
= qdisc_priv(sch
);
307 pr_debug("dsmark_requeue(skb %p,sch %p,[qdisc %p])\n", skb
, sch
, p
);
309 err
= p
->q
->ops
->requeue(skb
, p
->q
);
310 if (err
!= NET_XMIT_SUCCESS
) {
316 sch
->qstats
.requeues
++;
318 return NET_XMIT_SUCCESS
;
321 static unsigned int dsmark_drop(struct Qdisc
*sch
)
323 struct dsmark_qdisc_data
*p
= qdisc_priv(sch
);
326 pr_debug("dsmark_reset(sch %p,[qdisc %p])\n", sch
, p
);
328 if (p
->q
->ops
->drop
== NULL
)
331 len
= p
->q
->ops
->drop(p
->q
);
338 static int dsmark_init(struct Qdisc
*sch
, struct rtattr
*opt
)
340 struct dsmark_qdisc_data
*p
= qdisc_priv(sch
);
341 struct rtattr
*tb
[TCA_DSMARK_MAX
];
343 u32 default_index
= NO_DEFAULT_INDEX
;
347 pr_debug("dsmark_init(sch %p,[qdisc %p],opt %p)\n", sch
, p
, opt
);
349 if (!opt
|| rtattr_parse_nested(tb
, TCA_DSMARK_MAX
, opt
) < 0)
352 indices
= RTA_GET_U16(tb
[TCA_DSMARK_INDICES
-1]);
354 if (hweight32(indices
) != 1)
357 if (tb
[TCA_DSMARK_DEFAULT_INDEX
-1])
358 default_index
= RTA_GET_U16(tb
[TCA_DSMARK_DEFAULT_INDEX
-1]);
360 mask
= kmalloc(indices
* 2, GFP_KERNEL
);
367 memset(p
->mask
, 0xff, indices
);
369 p
->value
= p
->mask
+ indices
;
370 memset(p
->value
, 0, indices
);
372 p
->indices
= indices
;
373 p
->default_index
= default_index
;
374 p
->set_tc_index
= RTA_GET_FLAG(tb
[TCA_DSMARK_SET_TC_INDEX
-1]);
376 p
->q
= qdisc_create_dflt(sch
->dev
, &pfifo_qdisc_ops
, sch
->handle
);
380 pr_debug("dsmark_init: qdisc %p\n", p
->q
);
388 static void dsmark_reset(struct Qdisc
*sch
)
390 struct dsmark_qdisc_data
*p
= qdisc_priv(sch
);
392 pr_debug("dsmark_reset(sch %p,[qdisc %p])\n", sch
, p
);
397 static void dsmark_destroy(struct Qdisc
*sch
)
399 struct dsmark_qdisc_data
*p
= qdisc_priv(sch
);
401 pr_debug("dsmark_destroy(sch %p,[qdisc %p])\n", sch
, p
);
403 tcf_destroy_chain(p
->filter_list
);
408 static int dsmark_dump_class(struct Qdisc
*sch
, unsigned long cl
,
409 struct sk_buff
*skb
, struct tcmsg
*tcm
)
411 struct dsmark_qdisc_data
*p
= qdisc_priv(sch
);
412 struct rtattr
*opts
= NULL
;
414 pr_debug("dsmark_dump_class(sch %p,[qdisc %p],class %ld\n", sch
, p
, cl
);
416 if (!dsmark_valid_index(p
, cl
))
419 tcm
->tcm_handle
= TC_H_MAKE(TC_H_MAJ(sch
->handle
), cl
-1);
420 tcm
->tcm_info
= p
->q
->handle
;
422 opts
= RTA_NEST(skb
, TCA_OPTIONS
);
423 RTA_PUT_U8(skb
, TCA_DSMARK_MASK
, p
->mask
[cl
-1]);
424 RTA_PUT_U8(skb
, TCA_DSMARK_VALUE
, p
->value
[cl
-1]);
426 return RTA_NEST_END(skb
, opts
);
429 return RTA_NEST_CANCEL(skb
, opts
);
432 static int dsmark_dump(struct Qdisc
*sch
, struct sk_buff
*skb
)
434 struct dsmark_qdisc_data
*p
= qdisc_priv(sch
);
435 struct rtattr
*opts
= NULL
;
437 opts
= RTA_NEST(skb
, TCA_OPTIONS
);
438 RTA_PUT_U16(skb
, TCA_DSMARK_INDICES
, p
->indices
);
440 if (p
->default_index
!= NO_DEFAULT_INDEX
)
441 RTA_PUT_U16(skb
, TCA_DSMARK_DEFAULT_INDEX
, p
->default_index
);
444 RTA_PUT_FLAG(skb
, TCA_DSMARK_SET_TC_INDEX
);
446 return RTA_NEST_END(skb
, opts
);
449 return RTA_NEST_CANCEL(skb
, opts
);
452 static const struct Qdisc_class_ops dsmark_class_ops
= {
453 .graft
= dsmark_graft
,
457 .change
= dsmark_change
,
458 .delete = dsmark_delete
,
460 .tcf_chain
= dsmark_find_tcf
,
461 .bind_tcf
= dsmark_bind_filter
,
462 .unbind_tcf
= dsmark_put
,
463 .dump
= dsmark_dump_class
,
466 static struct Qdisc_ops dsmark_qdisc_ops __read_mostly
= {
468 .cl_ops
= &dsmark_class_ops
,
470 .priv_size
= sizeof(struct dsmark_qdisc_data
),
471 .enqueue
= dsmark_enqueue
,
472 .dequeue
= dsmark_dequeue
,
473 .requeue
= dsmark_requeue
,
476 .reset
= dsmark_reset
,
477 .destroy
= dsmark_destroy
,
480 .owner
= THIS_MODULE
,
483 static int __init
dsmark_module_init(void)
485 return register_qdisc(&dsmark_qdisc_ops
);
488 static void __exit
dsmark_module_exit(void)
490 unregister_qdisc(&dsmark_qdisc_ops
);
493 module_init(dsmark_module_init
)
494 module_exit(dsmark_module_exit
)
496 MODULE_LICENSE("GPL");