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[mirror_ubuntu-artful-kernel.git] / net / sched / sch_dsmark.c
CommitLineData
1da177e4
LT
1/* net/sched/sch_dsmark.c - Differentiated Services field marker */
2
3/* Written 1998-2000 by Werner Almesberger, EPFL ICA */
4
5
1da177e4
LT
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>
1da177e4 12#include <linux/rtnetlink.h>
5b0ac72b 13#include <linux/bitops.h>
1da177e4
LT
14#include <net/pkt_sched.h>
15#include <net/dsfield.h>
16#include <net/inet_ecn.h>
17#include <asm/byteorder.h>
18
1da177e4
LT
19/*
20 * classid class marking
21 * ------- ----- -------
22 * n/a 0 n/a
23 * x:0 1 use entry [0]
24 * ... ... ...
25 * x:y y>0 y+1 use entry [y]
26 * ... ... ...
27 * x:indices-1 indices use entry [indices-1]
28 * ... ... ...
29 * x:y y+1 use entry [y & (indices-1)]
30 * ... ... ...
31 * 0xffff 0x10000 use entry [indices-1]
32 */
33
34
35#define NO_DEFAULT_INDEX (1 << 16)
36
37struct dsmark_qdisc_data {
38 struct Qdisc *q;
39 struct tcf_proto *filter_list;
af0d1141
TG
40 u8 *mask; /* "owns" the array */
41 u8 *value;
42 u16 indices;
43 u32 default_index; /* index range is 0...0xffff */
1da177e4
LT
44 int set_tc_index;
45};
46
758cc43c
TG
47static inline int dsmark_valid_index(struct dsmark_qdisc_data *p, u16 index)
48{
49 return (index <= p->indices && index > 0);
50}
1da177e4
LT
51
52/* ------------------------- Class/flow operations ------------------------- */
53
af0d1141
TG
54static int dsmark_graft(struct Qdisc *sch, unsigned long arg,
55 struct Qdisc *new, struct Qdisc **old)
1da177e4 56{
81da99ed 57 struct dsmark_qdisc_data *p = qdisc_priv(sch);
1da177e4 58
81da99ed 59 pr_debug("dsmark_graft(sch %p,[qdisc %p],new %p,old %p)\n",
af0d1141 60 sch, p, new, old);
486b53e5
TG
61
62 if (new == NULL) {
9f9afec4
PM
63 new = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops,
64 sch->handle);
486b53e5
TG
65 if (new == NULL)
66 new = &noop_qdisc;
67 }
68
1da177e4 69 sch_tree_lock(sch);
af0d1141 70 *old = xchg(&p->q, new);
5e50da01 71 qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
af0d1141 72 qdisc_reset(*old);
af0d1141
TG
73 sch_tree_unlock(sch);
74
10297b99 75 return 0;
1da177e4
LT
76}
77
1da177e4
LT
78static struct Qdisc *dsmark_leaf(struct Qdisc *sch, unsigned long arg)
79{
81da99ed
SH
80 struct dsmark_qdisc_data *p = qdisc_priv(sch);
81 return p->q;
1da177e4
LT
82}
83
af0d1141 84static unsigned long dsmark_get(struct Qdisc *sch, u32 classid)
1da177e4 85{
81da99ed
SH
86 pr_debug("dsmark_get(sch %p,[qdisc %p],classid %x)\n",
87 sch, qdisc_priv(sch), classid);
1da177e4 88
af0d1141 89 return TC_H_MIN(classid) + 1;
1da177e4
LT
90}
91
1da177e4 92static unsigned long dsmark_bind_filter(struct Qdisc *sch,
af0d1141 93 unsigned long parent, u32 classid)
1da177e4 94{
af0d1141 95 return dsmark_get(sch, classid);
1da177e4
LT
96}
97
1da177e4
LT
98static void dsmark_put(struct Qdisc *sch, unsigned long cl)
99{
100}
101
1da177e4 102static int dsmark_change(struct Qdisc *sch, u32 classid, u32 parent,
1e90474c 103 struct nlattr **tca, unsigned long *arg)
1da177e4 104{
81da99ed 105 struct dsmark_qdisc_data *p = qdisc_priv(sch);
1e90474c
PM
106 struct nlattr *opt = tca[TCA_OPTIONS];
107 struct nlattr *tb[TCA_DSMARK_MAX + 1];
758cc43c
TG
108 int err = -EINVAL;
109 u8 mask = 0;
1da177e4 110
81da99ed 111 pr_debug("dsmark_change(sch %p,[qdisc %p],classid %x,parent %x),"
758cc43c
TG
112 "arg 0x%lx\n", sch, p, classid, parent, *arg);
113
114 if (!dsmark_valid_index(p, *arg)) {
115 err = -ENOENT;
1e90474c 116 goto errout;
1da177e4 117 }
1da177e4 118
1e90474c
PM
119 if (!opt || nla_parse_nested(tb, TCA_DSMARK_MAX, opt, NULL))
120 goto errout;
758cc43c 121
1e90474c
PM
122 if (tb[TCA_DSMARK_MASK]) {
123 if (nla_len(tb[TCA_DSMARK_MASK]) < sizeof(u8))
124 goto errout;
125 mask = nla_get_u8(tb[TCA_DSMARK_MASK]);
126 }
127 if (tb[TCA_DSMARK_VALUE]) {
128 if (nla_len(tb[TCA_DSMARK_VALUE]) < sizeof(u8))
129 goto errout;
130 p->value[*arg-1] = nla_get_u8(tb[TCA_DSMARK_VALUE]);
131 }
10297b99 132
1e90474c 133 if (tb[TCA_DSMARK_MASK])
758cc43c
TG
134 p->mask[*arg-1] = mask;
135
136 err = 0;
137
1e90474c 138errout:
758cc43c
TG
139 return err;
140}
1da177e4 141
af0d1141 142static int dsmark_delete(struct Qdisc *sch, unsigned long arg)
1da177e4 143{
81da99ed 144 struct dsmark_qdisc_data *p = qdisc_priv(sch);
1da177e4 145
af0d1141 146 if (!dsmark_valid_index(p, arg))
1da177e4 147 return -EINVAL;
10297b99 148
1da177e4
LT
149 p->mask[arg-1] = 0xff;
150 p->value[arg-1] = 0;
af0d1141 151
1da177e4
LT
152 return 0;
153}
154
9d127fbd 155static void dsmark_walk(struct Qdisc *sch, struct qdisc_walker *walker)
1da177e4 156{
81da99ed 157 struct dsmark_qdisc_data *p = qdisc_priv(sch);
1da177e4
LT
158 int i;
159
81da99ed 160 pr_debug("dsmark_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
af0d1141 161
1da177e4
LT
162 if (walker->stop)
163 return;
af0d1141 164
1da177e4
LT
165 for (i = 0; i < p->indices; i++) {
166 if (p->mask[i] == 0xff && !p->value[i])
0451eb07 167 goto ignore;
1da177e4
LT
168 if (walker->count >= walker->skip) {
169 if (walker->fn(sch, i+1, walker) < 0) {
170 walker->stop = 1;
171 break;
172 }
173 }
10297b99 174ignore:
0451eb07 175 walker->count++;
10297b99 176 }
1da177e4
LT
177}
178
9d127fbd
SH
179static inline struct tcf_proto **dsmark_find_tcf(struct Qdisc *sch,
180 unsigned long cl)
1da177e4 181{
81da99ed
SH
182 struct dsmark_qdisc_data *p = qdisc_priv(sch);
183 return &p->filter_list;
1da177e4
LT
184}
185
1da177e4
LT
186/* --------------------------- Qdisc operations ---------------------------- */
187
9d127fbd 188static int dsmark_enqueue(struct sk_buff *skb, struct Qdisc *sch)
1da177e4 189{
81da99ed 190 struct dsmark_qdisc_data *p = qdisc_priv(sch);
af0d1141
TG
191 int err;
192
81da99ed 193 pr_debug("dsmark_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
1da177e4 194
1da177e4 195 if (p->set_tc_index) {
1da177e4 196 switch (skb->protocol) {
9d127fbd
SH
197 case __constant_htons(ETH_P_IP):
198 if (skb_cow_head(skb, sizeof(struct iphdr)))
199 goto drop;
4c30719f 200
9d127fbd
SH
201 skb->tc_index = ipv4_get_dsfield(ip_hdr(skb))
202 & ~INET_ECN_MASK;
203 break;
4c30719f 204
9d127fbd
SH
205 case __constant_htons(ETH_P_IPV6):
206 if (skb_cow_head(skb, sizeof(struct ipv6hdr)))
207 goto drop;
4c30719f 208
9d127fbd
SH
209 skb->tc_index = ipv6_get_dsfield(ipv6_hdr(skb))
210 & ~INET_ECN_MASK;
211 break;
212 default:
213 skb->tc_index = 0;
214 break;
3ff50b79 215 }
1da177e4 216 }
af0d1141
TG
217
218 if (TC_H_MAJ(skb->priority) == sch->handle)
1da177e4 219 skb->tc_index = TC_H_MIN(skb->priority);
af0d1141
TG
220 else {
221 struct tcf_result res;
222 int result = tc_classify(skb, p->filter_list, &res);
223
81da99ed 224 pr_debug("result %d class 0x%04x\n", result, res.classid);
af0d1141 225
1da177e4 226 switch (result) {
f6853e2d
PM
227#ifdef CONFIG_NET_CLS_ACT
228 case TC_ACT_QUEUED:
229 case TC_ACT_STOLEN:
230 kfree_skb(skb);
231 return NET_XMIT_SUCCESS;
4c30719f 232
f6853e2d 233 case TC_ACT_SHOT:
4c30719f 234 goto drop;
1da177e4 235#endif
c3bc7cff 236 case TC_ACT_OK:
f6853e2d
PM
237 skb->tc_index = TC_H_MIN(res.classid);
238 break;
4c30719f 239
f6853e2d
PM
240 default:
241 if (p->default_index != NO_DEFAULT_INDEX)
242 skb->tc_index = p->default_index;
243 break;
3ff50b79 244 }
1da177e4 245 }
1da177e4 246
9d127fbd 247 err = p->q->enqueue(skb, p->q);
af0d1141 248 if (err != NET_XMIT_SUCCESS) {
1da177e4 249 sch->qstats.drops++;
af0d1141 250 return err;
1da177e4 251 }
af0d1141 252
1da177e4
LT
253 sch->bstats.bytes += skb->len;
254 sch->bstats.packets++;
255 sch->q.qlen++;
1da177e4 256
af0d1141 257 return NET_XMIT_SUCCESS;
4c30719f
SH
258
259drop:
260 kfree_skb(skb);
261 sch->qstats.drops++;
262 return NET_XMIT_BYPASS;
af0d1141 263}
1da177e4
LT
264
265static struct sk_buff *dsmark_dequeue(struct Qdisc *sch)
266{
81da99ed 267 struct dsmark_qdisc_data *p = qdisc_priv(sch);
1da177e4 268 struct sk_buff *skb;
af0d1141
TG
269 u32 index;
270
81da99ed 271 pr_debug("dsmark_dequeue(sch %p,[qdisc %p])\n", sch, p);
1da177e4 272
1da177e4 273 skb = p->q->ops->dequeue(p->q);
af0d1141 274 if (skb == NULL)
1da177e4 275 return NULL;
af0d1141 276
1da177e4 277 sch->q.qlen--;
af0d1141
TG
278
279 index = skb->tc_index & (p->indices - 1);
81da99ed 280 pr_debug("index %d->%d\n", skb->tc_index, index);
af0d1141 281
1da177e4 282 switch (skb->protocol) {
9d127fbd
SH
283 case __constant_htons(ETH_P_IP):
284 ipv4_change_dsfield(ip_hdr(skb), p->mask[index],
285 p->value[index]);
1da177e4 286 break;
9d127fbd
SH
287 case __constant_htons(ETH_P_IPV6):
288 ipv6_change_dsfield(ipv6_hdr(skb), p->mask[index],
289 p->value[index]);
1da177e4 290 break;
9d127fbd
SH
291 default:
292 /*
293 * Only complain if a change was actually attempted.
294 * This way, we can send non-IP traffic through dsmark
295 * and don't need yet another qdisc as a bypass.
296 */
297 if (p->mask[index] != 0xff || p->value[index])
298 printk(KERN_WARNING
299 "dsmark_dequeue: unsupported protocol %d\n",
300 ntohs(skb->protocol));
301 break;
3ff50b79 302 }
af0d1141 303
1da177e4
LT
304 return skb;
305}
306
9d127fbd 307static int dsmark_requeue(struct sk_buff *skb, struct Qdisc *sch)
1da177e4 308{
81da99ed 309 struct dsmark_qdisc_data *p = qdisc_priv(sch);
af0d1141 310 int err;
1da177e4 311
81da99ed 312 pr_debug("dsmark_requeue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
af0d1141
TG
313
314 err = p->q->ops->requeue(skb, p->q);
315 if (err != NET_XMIT_SUCCESS) {
316 sch->qstats.drops++;
317 return err;
1da177e4 318 }
1da177e4 319
af0d1141
TG
320 sch->q.qlen++;
321 sch->qstats.requeues++;
322
323 return NET_XMIT_SUCCESS;
324}
1da177e4
LT
325
326static unsigned int dsmark_drop(struct Qdisc *sch)
327{
81da99ed 328 struct dsmark_qdisc_data *p = qdisc_priv(sch);
1da177e4 329 unsigned int len;
10297b99 330
81da99ed 331 pr_debug("dsmark_reset(sch %p,[qdisc %p])\n", sch, p);
af0d1141
TG
332
333 if (p->q->ops->drop == NULL)
1da177e4 334 return 0;
af0d1141
TG
335
336 len = p->q->ops->drop(p->q);
337 if (len)
338 sch->q.qlen--;
339
1da177e4
LT
340 return len;
341}
342
1e90474c 343static int dsmark_init(struct Qdisc *sch, struct nlattr *opt)
1da177e4 344{
81da99ed 345 struct dsmark_qdisc_data *p = qdisc_priv(sch);
1e90474c 346 struct nlattr *tb[TCA_DSMARK_MAX + 1];
758cc43c
TG
347 int err = -EINVAL;
348 u32 default_index = NO_DEFAULT_INDEX;
349 u16 indices;
350 u8 *mask;
351
81da99ed 352 pr_debug("dsmark_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
758cc43c 353
1e90474c 354 if (!opt || nla_parse_nested(tb, TCA_DSMARK_MAX, opt, NULL) < 0)
758cc43c
TG
355 goto errout;
356
1e90474c
PM
357 if (nla_len(tb[TCA_DSMARK_INDICES]) < sizeof(u16))
358 goto errout;
359 indices = nla_get_u16(tb[TCA_DSMARK_INDICES]);
5b0ac72b
DM
360
361 if (hweight32(indices) != 1)
758cc43c
TG
362 goto errout;
363
1e90474c
PM
364 if (tb[TCA_DSMARK_DEFAULT_INDEX]) {
365 if (nla_len(tb[TCA_DSMARK_DEFAULT_INDEX]) < sizeof(u16))
366 goto errout;
367 default_index = nla_get_u16(tb[TCA_DSMARK_DEFAULT_INDEX]);
368 }
758cc43c
TG
369
370 mask = kmalloc(indices * 2, GFP_KERNEL);
371 if (mask == NULL) {
372 err = -ENOMEM;
373 goto errout;
1da177e4 374 }
758cc43c
TG
375
376 p->mask = mask;
377 memset(p->mask, 0xff, indices);
378
379 p->value = p->mask + indices;
380 memset(p->value, 0, indices);
381
382 p->indices = indices;
383 p->default_index = default_index;
1e90474c 384 p->set_tc_index = nla_get_flag(tb[TCA_DSMARK_SET_TC_INDEX]);
758cc43c 385
9f9afec4 386 p->q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, sch->handle);
758cc43c 387 if (p->q == NULL)
1da177e4 388 p->q = &noop_qdisc;
758cc43c 389
81da99ed 390 pr_debug("dsmark_init: qdisc %p\n", p->q);
758cc43c
TG
391
392 err = 0;
393errout:
758cc43c 394 return err;
1da177e4
LT
395}
396
1da177e4
LT
397static void dsmark_reset(struct Qdisc *sch)
398{
81da99ed 399 struct dsmark_qdisc_data *p = qdisc_priv(sch);
1da177e4 400
81da99ed 401 pr_debug("dsmark_reset(sch %p,[qdisc %p])\n", sch, p);
1da177e4
LT
402 qdisc_reset(p->q);
403 sch->q.qlen = 0;
404}
405
1da177e4
LT
406static void dsmark_destroy(struct Qdisc *sch)
407{
81da99ed 408 struct dsmark_qdisc_data *p = qdisc_priv(sch);
1da177e4 409
81da99ed 410 pr_debug("dsmark_destroy(sch %p,[qdisc %p])\n", sch, p);
af0d1141 411
a48b5a61 412 tcf_destroy_chain(p->filter_list);
1da177e4
LT
413 qdisc_destroy(p->q);
414 kfree(p->mask);
415}
416
1da177e4 417static int dsmark_dump_class(struct Qdisc *sch, unsigned long cl,
02f23f09 418 struct sk_buff *skb, struct tcmsg *tcm)
1da177e4 419{
81da99ed 420 struct dsmark_qdisc_data *p = qdisc_priv(sch);
1e90474c 421 struct nlattr *opts = NULL;
1da177e4 422
81da99ed 423 pr_debug("dsmark_dump_class(sch %p,[qdisc %p],class %ld\n", sch, p, cl);
02f23f09
TG
424
425 if (!dsmark_valid_index(p, cl))
1da177e4 426 return -EINVAL;
02f23f09
TG
427
428 tcm->tcm_handle = TC_H_MAKE(TC_H_MAJ(sch->handle), cl-1);
cdc7f8e3 429 tcm->tcm_info = p->q->handle;
02f23f09 430
1e90474c
PM
431 opts = nla_nest_start(skb, TCA_OPTIONS);
432 if (opts == NULL)
433 goto nla_put_failure;
434 NLA_PUT_U8(skb, TCA_DSMARK_MASK, p->mask[cl-1]);
435 NLA_PUT_U8(skb, TCA_DSMARK_VALUE, p->value[cl-1]);
02f23f09 436
1e90474c 437 return nla_nest_end(skb, opts);
1da177e4 438
1e90474c
PM
439nla_put_failure:
440 return nla_nest_cancel(skb, opts);
1da177e4
LT
441}
442
443static int dsmark_dump(struct Qdisc *sch, struct sk_buff *skb)
444{
81da99ed 445 struct dsmark_qdisc_data *p = qdisc_priv(sch);
1e90474c 446 struct nlattr *opts = NULL;
1da177e4 447
1e90474c
PM
448 opts = nla_nest_start(skb, TCA_OPTIONS);
449 if (opts == NULL)
450 goto nla_put_failure;
451 NLA_PUT_U16(skb, TCA_DSMARK_INDICES, p->indices);
02f23f09
TG
452
453 if (p->default_index != NO_DEFAULT_INDEX)
1e90474c 454 NLA_PUT_U16(skb, TCA_DSMARK_DEFAULT_INDEX, p->default_index);
1da177e4 455
1da177e4 456 if (p->set_tc_index)
1e90474c 457 NLA_PUT_FLAG(skb, TCA_DSMARK_SET_TC_INDEX);
02f23f09 458
1e90474c 459 return nla_nest_end(skb, opts);
1da177e4 460
1e90474c
PM
461nla_put_failure:
462 return nla_nest_cancel(skb, opts);
1da177e4
LT
463}
464
20fea08b 465static const struct Qdisc_class_ops dsmark_class_ops = {
1da177e4
LT
466 .graft = dsmark_graft,
467 .leaf = dsmark_leaf,
468 .get = dsmark_get,
469 .put = dsmark_put,
470 .change = dsmark_change,
471 .delete = dsmark_delete,
472 .walk = dsmark_walk,
473 .tcf_chain = dsmark_find_tcf,
474 .bind_tcf = dsmark_bind_filter,
475 .unbind_tcf = dsmark_put,
476 .dump = dsmark_dump_class,
477};
478
20fea08b 479static struct Qdisc_ops dsmark_qdisc_ops __read_mostly = {
1da177e4
LT
480 .next = NULL,
481 .cl_ops = &dsmark_class_ops,
482 .id = "dsmark",
483 .priv_size = sizeof(struct dsmark_qdisc_data),
484 .enqueue = dsmark_enqueue,
485 .dequeue = dsmark_dequeue,
486 .requeue = dsmark_requeue,
487 .drop = dsmark_drop,
488 .init = dsmark_init,
489 .reset = dsmark_reset,
490 .destroy = dsmark_destroy,
491 .change = NULL,
492 .dump = dsmark_dump,
493 .owner = THIS_MODULE,
494};
495
496static int __init dsmark_module_init(void)
497{
498 return register_qdisc(&dsmark_qdisc_ops);
499}
af0d1141 500
10297b99 501static void __exit dsmark_module_exit(void)
1da177e4
LT
502{
503 unregister_qdisc(&dsmark_qdisc_ops);
504}
af0d1141 505
1da177e4
LT
506module_init(dsmark_module_init)
507module_exit(dsmark_module_exit)
af0d1141 508
1da177e4 509MODULE_LICENSE("GPL");