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/slab.h>
9 #include <linux/types.h>
10 #include <linux/string.h>
11 #include <linux/errno.h>
12 #include <linux/skbuff.h>
13 #include <linux/rtnetlink.h>
14 #include <linux/bitops.h>
15 #include <net/pkt_sched.h>
16 #include <net/pkt_cls.h>
17 #include <net/dsfield.h>
18 #include <net/inet_ecn.h>
19 #include <asm/byteorder.h>
22 * classid class marking
23 * ------- ----- -------
27 * x:y y>0 y+1 use entry [y]
29 * x:indices-1 indices use entry [indices-1]
31 * x:y y+1 use entry [y & (indices-1)]
33 * 0xffff 0x10000 use entry [indices-1]
37 #define NO_DEFAULT_INDEX (1 << 16)
44 struct dsmark_qdisc_data
{
46 struct tcf_proto __rcu
*filter_list
;
47 struct tcf_block
*block
;
48 struct mask_value
*mv
;
51 u32 default_index
; /* index range is 0...0xffff */
52 #define DSMARK_EMBEDDED_SZ 16
53 struct mask_value embedded
[DSMARK_EMBEDDED_SZ
];
56 static inline int dsmark_valid_index(struct dsmark_qdisc_data
*p
, u16 index
)
58 return index
<= p
->indices
&& index
> 0;
61 /* ------------------------- Class/flow operations ------------------------- */
63 static int dsmark_graft(struct Qdisc
*sch
, unsigned long arg
,
64 struct Qdisc
*new, struct Qdisc
**old
)
66 struct dsmark_qdisc_data
*p
= qdisc_priv(sch
);
68 pr_debug("%s(sch %p,[qdisc %p],new %p,old %p)\n",
69 __func__
, sch
, p
, new, old
);
72 new = qdisc_create_dflt(sch
->dev_queue
, &pfifo_qdisc_ops
,
78 *old
= qdisc_replace(sch
, new, &p
->q
);
82 static struct Qdisc
*dsmark_leaf(struct Qdisc
*sch
, unsigned long arg
)
84 struct dsmark_qdisc_data
*p
= qdisc_priv(sch
);
88 static unsigned long dsmark_get(struct Qdisc
*sch
, u32 classid
)
90 pr_debug("%s(sch %p,[qdisc %p],classid %x)\n",
91 __func__
, sch
, qdisc_priv(sch
), classid
);
93 return TC_H_MIN(classid
) + 1;
96 static unsigned long dsmark_bind_filter(struct Qdisc
*sch
,
97 unsigned long parent
, u32 classid
)
99 return dsmark_get(sch
, classid
);
102 static void dsmark_put(struct Qdisc
*sch
, unsigned long cl
)
106 static const struct nla_policy dsmark_policy
[TCA_DSMARK_MAX
+ 1] = {
107 [TCA_DSMARK_INDICES
] = { .type
= NLA_U16
},
108 [TCA_DSMARK_DEFAULT_INDEX
] = { .type
= NLA_U16
},
109 [TCA_DSMARK_SET_TC_INDEX
] = { .type
= NLA_FLAG
},
110 [TCA_DSMARK_MASK
] = { .type
= NLA_U8
},
111 [TCA_DSMARK_VALUE
] = { .type
= NLA_U8
},
114 static int dsmark_change(struct Qdisc
*sch
, u32 classid
, u32 parent
,
115 struct nlattr
**tca
, unsigned long *arg
)
117 struct dsmark_qdisc_data
*p
= qdisc_priv(sch
);
118 struct nlattr
*opt
= tca
[TCA_OPTIONS
];
119 struct nlattr
*tb
[TCA_DSMARK_MAX
+ 1];
122 pr_debug("%s(sch %p,[qdisc %p],classid %x,parent %x), arg 0x%lx\n",
123 __func__
, sch
, p
, classid
, parent
, *arg
);
125 if (!dsmark_valid_index(p
, *arg
)) {
133 err
= nla_parse_nested(tb
, TCA_DSMARK_MAX
, opt
, dsmark_policy
, NULL
);
137 if (tb
[TCA_DSMARK_VALUE
])
138 p
->mv
[*arg
- 1].value
= nla_get_u8(tb
[TCA_DSMARK_VALUE
]);
140 if (tb
[TCA_DSMARK_MASK
])
141 p
->mv
[*arg
- 1].mask
= nla_get_u8(tb
[TCA_DSMARK_MASK
]);
149 static int dsmark_delete(struct Qdisc
*sch
, unsigned long arg
)
151 struct dsmark_qdisc_data
*p
= qdisc_priv(sch
);
153 if (!dsmark_valid_index(p
, arg
))
156 p
->mv
[arg
- 1].mask
= 0xff;
157 p
->mv
[arg
- 1].value
= 0;
162 static void dsmark_walk(struct Qdisc
*sch
, struct qdisc_walker
*walker
)
164 struct dsmark_qdisc_data
*p
= qdisc_priv(sch
);
167 pr_debug("%s(sch %p,[qdisc %p],walker %p)\n",
168 __func__
, sch
, p
, walker
);
173 for (i
= 0; i
< p
->indices
; i
++) {
174 if (p
->mv
[i
].mask
== 0xff && !p
->mv
[i
].value
)
176 if (walker
->count
>= walker
->skip
) {
177 if (walker
->fn(sch
, i
+ 1, walker
) < 0) {
187 static struct tcf_block
*dsmark_tcf_block(struct Qdisc
*sch
, unsigned long cl
)
189 struct dsmark_qdisc_data
*p
= qdisc_priv(sch
);
194 /* --------------------------- Qdisc operations ---------------------------- */
196 static int dsmark_enqueue(struct sk_buff
*skb
, struct Qdisc
*sch
,
197 struct sk_buff
**to_free
)
199 struct dsmark_qdisc_data
*p
= qdisc_priv(sch
);
202 pr_debug("%s(skb %p,sch %p,[qdisc %p])\n", __func__
, skb
, sch
, p
);
204 if (p
->set_tc_index
) {
205 int wlen
= skb_network_offset(skb
);
207 switch (tc_skb_protocol(skb
)) {
208 case htons(ETH_P_IP
):
209 wlen
+= sizeof(struct iphdr
);
210 if (!pskb_may_pull(skb
, wlen
) ||
211 skb_try_make_writable(skb
, wlen
))
214 skb
->tc_index
= ipv4_get_dsfield(ip_hdr(skb
))
218 case htons(ETH_P_IPV6
):
219 wlen
+= sizeof(struct ipv6hdr
);
220 if (!pskb_may_pull(skb
, wlen
) ||
221 skb_try_make_writable(skb
, wlen
))
224 skb
->tc_index
= ipv6_get_dsfield(ipv6_hdr(skb
))
233 if (TC_H_MAJ(skb
->priority
) == sch
->handle
)
234 skb
->tc_index
= TC_H_MIN(skb
->priority
);
236 struct tcf_result res
;
237 struct tcf_proto
*fl
= rcu_dereference_bh(p
->filter_list
);
238 int result
= tcf_classify(skb
, fl
, &res
, false);
240 pr_debug("result %d class 0x%04x\n", result
, res
.classid
);
243 #ifdef CONFIG_NET_CLS_ACT
247 __qdisc_drop(skb
, to_free
);
248 return NET_XMIT_SUCCESS
| __NET_XMIT_STOLEN
;
254 skb
->tc_index
= TC_H_MIN(res
.classid
);
258 if (p
->default_index
!= NO_DEFAULT_INDEX
)
259 skb
->tc_index
= p
->default_index
;
264 err
= qdisc_enqueue(skb
, p
->q
, to_free
);
265 if (err
!= NET_XMIT_SUCCESS
) {
266 if (net_xmit_drop_count(err
))
267 qdisc_qstats_drop(sch
);
271 qdisc_qstats_backlog_inc(sch
, skb
);
274 return NET_XMIT_SUCCESS
;
277 qdisc_drop(skb
, sch
, to_free
);
278 return NET_XMIT_SUCCESS
| __NET_XMIT_BYPASS
;
281 static struct sk_buff
*dsmark_dequeue(struct Qdisc
*sch
)
283 struct dsmark_qdisc_data
*p
= qdisc_priv(sch
);
287 pr_debug("%s(sch %p,[qdisc %p])\n", __func__
, sch
, p
);
289 skb
= qdisc_dequeue_peeked(p
->q
);
293 qdisc_bstats_update(sch
, skb
);
294 qdisc_qstats_backlog_dec(sch
, skb
);
297 index
= skb
->tc_index
& (p
->indices
- 1);
298 pr_debug("index %d->%d\n", skb
->tc_index
, index
);
300 switch (tc_skb_protocol(skb
)) {
301 case htons(ETH_P_IP
):
302 ipv4_change_dsfield(ip_hdr(skb
), p
->mv
[index
].mask
,
305 case htons(ETH_P_IPV6
):
306 ipv6_change_dsfield(ipv6_hdr(skb
), p
->mv
[index
].mask
,
311 * Only complain if a change was actually attempted.
312 * This way, we can send non-IP traffic through dsmark
313 * and don't need yet another qdisc as a bypass.
315 if (p
->mv
[index
].mask
!= 0xff || p
->mv
[index
].value
)
316 pr_warn("%s: unsupported protocol %d\n",
317 __func__
, ntohs(tc_skb_protocol(skb
)));
324 static struct sk_buff
*dsmark_peek(struct Qdisc
*sch
)
326 struct dsmark_qdisc_data
*p
= qdisc_priv(sch
);
328 pr_debug("%s(sch %p,[qdisc %p])\n", __func__
, sch
, p
);
330 return p
->q
->ops
->peek(p
->q
);
333 static int dsmark_init(struct Qdisc
*sch
, struct nlattr
*opt
)
335 struct dsmark_qdisc_data
*p
= qdisc_priv(sch
);
336 struct nlattr
*tb
[TCA_DSMARK_MAX
+ 1];
338 u32 default_index
= NO_DEFAULT_INDEX
;
342 pr_debug("%s(sch %p,[qdisc %p],opt %p)\n", __func__
, sch
, p
, opt
);
347 err
= tcf_block_get(&p
->block
, &p
->filter_list
);
351 err
= nla_parse_nested(tb
, TCA_DSMARK_MAX
, opt
, dsmark_policy
, NULL
);
356 indices
= nla_get_u16(tb
[TCA_DSMARK_INDICES
]);
358 if (hweight32(indices
) != 1)
361 if (tb
[TCA_DSMARK_DEFAULT_INDEX
])
362 default_index
= nla_get_u16(tb
[TCA_DSMARK_DEFAULT_INDEX
]);
364 if (indices
<= DSMARK_EMBEDDED_SZ
)
367 p
->mv
= kmalloc_array(indices
, sizeof(*p
->mv
), GFP_KERNEL
);
372 for (i
= 0; i
< indices
; i
++) {
373 p
->mv
[i
].mask
= 0xff;
376 p
->indices
= indices
;
377 p
->default_index
= default_index
;
378 p
->set_tc_index
= nla_get_flag(tb
[TCA_DSMARK_SET_TC_INDEX
]);
380 p
->q
= qdisc_create_dflt(sch
->dev_queue
, &pfifo_qdisc_ops
, sch
->handle
);
384 qdisc_hash_add(p
->q
, true);
386 pr_debug("%s: qdisc %p\n", __func__
, p
->q
);
393 static void dsmark_reset(struct Qdisc
*sch
)
395 struct dsmark_qdisc_data
*p
= qdisc_priv(sch
);
397 pr_debug("%s(sch %p,[qdisc %p])\n", __func__
, sch
, p
);
399 sch
->qstats
.backlog
= 0;
403 static void dsmark_destroy(struct Qdisc
*sch
)
405 struct dsmark_qdisc_data
*p
= qdisc_priv(sch
);
407 pr_debug("%s(sch %p,[qdisc %p])\n", __func__
, sch
, p
);
409 tcf_block_put(p
->block
);
411 if (p
->mv
!= p
->embedded
)
415 static int dsmark_dump_class(struct Qdisc
*sch
, unsigned long cl
,
416 struct sk_buff
*skb
, struct tcmsg
*tcm
)
418 struct dsmark_qdisc_data
*p
= qdisc_priv(sch
);
419 struct nlattr
*opts
= NULL
;
421 pr_debug("%s(sch %p,[qdisc %p],class %ld\n", __func__
, sch
, p
, cl
);
423 if (!dsmark_valid_index(p
, cl
))
426 tcm
->tcm_handle
= TC_H_MAKE(TC_H_MAJ(sch
->handle
), cl
- 1);
427 tcm
->tcm_info
= p
->q
->handle
;
429 opts
= nla_nest_start(skb
, TCA_OPTIONS
);
431 goto nla_put_failure
;
432 if (nla_put_u8(skb
, TCA_DSMARK_MASK
, p
->mv
[cl
- 1].mask
) ||
433 nla_put_u8(skb
, TCA_DSMARK_VALUE
, p
->mv
[cl
- 1].value
))
434 goto nla_put_failure
;
436 return nla_nest_end(skb
, opts
);
439 nla_nest_cancel(skb
, opts
);
443 static int dsmark_dump(struct Qdisc
*sch
, struct sk_buff
*skb
)
445 struct dsmark_qdisc_data
*p
= qdisc_priv(sch
);
446 struct nlattr
*opts
= NULL
;
448 opts
= nla_nest_start(skb
, TCA_OPTIONS
);
450 goto nla_put_failure
;
451 if (nla_put_u16(skb
, TCA_DSMARK_INDICES
, p
->indices
))
452 goto nla_put_failure
;
454 if (p
->default_index
!= NO_DEFAULT_INDEX
&&
455 nla_put_u16(skb
, TCA_DSMARK_DEFAULT_INDEX
, p
->default_index
))
456 goto nla_put_failure
;
458 if (p
->set_tc_index
&&
459 nla_put_flag(skb
, TCA_DSMARK_SET_TC_INDEX
))
460 goto nla_put_failure
;
462 return nla_nest_end(skb
, opts
);
465 nla_nest_cancel(skb
, opts
);
469 static const struct Qdisc_class_ops dsmark_class_ops
= {
470 .graft
= dsmark_graft
,
474 .change
= dsmark_change
,
475 .delete = dsmark_delete
,
477 .tcf_block
= dsmark_tcf_block
,
478 .bind_tcf
= dsmark_bind_filter
,
479 .unbind_tcf
= dsmark_put
,
480 .dump
= dsmark_dump_class
,
483 static struct Qdisc_ops dsmark_qdisc_ops __read_mostly
= {
485 .cl_ops
= &dsmark_class_ops
,
487 .priv_size
= sizeof(struct dsmark_qdisc_data
),
488 .enqueue
= dsmark_enqueue
,
489 .dequeue
= dsmark_dequeue
,
492 .reset
= dsmark_reset
,
493 .destroy
= dsmark_destroy
,
496 .owner
= THIS_MODULE
,
499 static int __init
dsmark_module_init(void)
501 return register_qdisc(&dsmark_qdisc_ops
);
504 static void __exit
dsmark_module_exit(void)
506 unregister_qdisc(&dsmark_qdisc_ops
);
509 module_init(dsmark_module_init
)
510 module_exit(dsmark_module_exit
)
512 MODULE_LICENSE("GPL");