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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>
12#include <linux/netdevice.h> /* for pkt_sched */
13#include <linux/rtnetlink.h>
14#include <net/pkt_sched.h>
15#include <net/dsfield.h>
16#include <net/inet_ecn.h>
17#include <asm/byteorder.h>
18
19
08e9cd1f 20#if 0 /* control */
1da177e4
LT
21#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
22#else
23#define DPRINTK(format,args...)
24#endif
25
26#if 0 /* data */
27#define D2PRINTK(format,args...) printk(KERN_DEBUG format,##args)
28#else
29#define D2PRINTK(format,args...)
30#endif
31
32
af0d1141 33#define PRIV(sch) ((struct dsmark_qdisc_data *) qdisc_priv(sch))
1da177e4
LT
34
35
36/*
37 * classid class marking
38 * ------- ----- -------
39 * n/a 0 n/a
40 * x:0 1 use entry [0]
41 * ... ... ...
42 * x:y y>0 y+1 use entry [y]
43 * ... ... ...
44 * x:indices-1 indices use entry [indices-1]
45 * ... ... ...
46 * x:y y+1 use entry [y & (indices-1)]
47 * ... ... ...
48 * 0xffff 0x10000 use entry [indices-1]
49 */
50
51
52#define NO_DEFAULT_INDEX (1 << 16)
53
54struct dsmark_qdisc_data {
55 struct Qdisc *q;
56 struct tcf_proto *filter_list;
af0d1141
TG
57 u8 *mask; /* "owns" the array */
58 u8 *value;
59 u16 indices;
60 u32 default_index; /* index range is 0...0xffff */
1da177e4
LT
61 int set_tc_index;
62};
63
758cc43c
TG
64static inline int dsmark_valid_indices(u16 indices)
65{
66 while (indices != 1) {
67 if (indices & 1)
68 return 0;
69 indices >>= 1;
70 }
71
72 return 1;
73}
74
75static inline int dsmark_valid_index(struct dsmark_qdisc_data *p, u16 index)
76{
77 return (index <= p->indices && index > 0);
78}
1da177e4
LT
79
80/* ------------------------- Class/flow operations ------------------------- */
81
af0d1141
TG
82static int dsmark_graft(struct Qdisc *sch, unsigned long arg,
83 struct Qdisc *new, struct Qdisc **old)
1da177e4
LT
84{
85 struct dsmark_qdisc_data *p = PRIV(sch);
86
af0d1141
TG
87 DPRINTK("dsmark_graft(sch %p,[qdisc %p],new %p,old %p)\n",
88 sch, p, new, old);
486b53e5
TG
89
90 if (new == NULL) {
91 new = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops);
92 if (new == NULL)
93 new = &noop_qdisc;
94 }
95
1da177e4 96 sch_tree_lock(sch);
af0d1141
TG
97 *old = xchg(&p->q, new);
98 qdisc_reset(*old);
1da177e4 99 sch->q.qlen = 0;
af0d1141
TG
100 sch_tree_unlock(sch);
101
1da177e4
LT
102 return 0;
103}
104
1da177e4
LT
105static struct Qdisc *dsmark_leaf(struct Qdisc *sch, unsigned long arg)
106{
af0d1141 107 return PRIV(sch)->q;
1da177e4
LT
108}
109
af0d1141 110static unsigned long dsmark_get(struct Qdisc *sch, u32 classid)
1da177e4 111{
af0d1141
TG
112 DPRINTK("dsmark_get(sch %p,[qdisc %p],classid %x)\n",
113 sch, PRIV(sch), classid);
1da177e4 114
af0d1141 115 return TC_H_MIN(classid) + 1;
1da177e4
LT
116}
117
1da177e4 118static unsigned long dsmark_bind_filter(struct Qdisc *sch,
af0d1141 119 unsigned long parent, u32 classid)
1da177e4 120{
af0d1141 121 return dsmark_get(sch, classid);
1da177e4
LT
122}
123
1da177e4
LT
124static void dsmark_put(struct Qdisc *sch, unsigned long cl)
125{
126}
127
1da177e4 128static int dsmark_change(struct Qdisc *sch, u32 classid, u32 parent,
758cc43c 129 struct rtattr **tca, unsigned long *arg)
1da177e4
LT
130{
131 struct dsmark_qdisc_data *p = PRIV(sch);
132 struct rtattr *opt = tca[TCA_OPTIONS-1];
133 struct rtattr *tb[TCA_DSMARK_MAX];
758cc43c
TG
134 int err = -EINVAL;
135 u8 mask = 0;
1da177e4
LT
136
137 DPRINTK("dsmark_change(sch %p,[qdisc %p],classid %x,parent %x),"
758cc43c
TG
138 "arg 0x%lx\n", sch, p, classid, parent, *arg);
139
140 if (!dsmark_valid_index(p, *arg)) {
141 err = -ENOENT;
142 goto rtattr_failure;
1da177e4 143 }
1da177e4 144
758cc43c
TG
145 if (!opt || rtattr_parse_nested(tb, TCA_DSMARK_MAX, opt))
146 goto rtattr_failure;
147
148 if (tb[TCA_DSMARK_MASK-1])
149 mask = RTA_GET_U8(tb[TCA_DSMARK_MASK-1]);
150
151 if (tb[TCA_DSMARK_VALUE-1])
152 p->value[*arg-1] = RTA_GET_U8(tb[TCA_DSMARK_VALUE-1]);
153
154 if (tb[TCA_DSMARK_MASK-1])
155 p->mask[*arg-1] = mask;
156
157 err = 0;
158
159rtattr_failure:
160 return err;
161}
1da177e4 162
af0d1141 163static int dsmark_delete(struct Qdisc *sch, unsigned long arg)
1da177e4
LT
164{
165 struct dsmark_qdisc_data *p = PRIV(sch);
166
af0d1141 167 if (!dsmark_valid_index(p, arg))
1da177e4 168 return -EINVAL;
af0d1141 169
1da177e4
LT
170 p->mask[arg-1] = 0xff;
171 p->value[arg-1] = 0;
af0d1141 172
1da177e4
LT
173 return 0;
174}
175
1da177e4
LT
176static void dsmark_walk(struct Qdisc *sch,struct qdisc_walker *walker)
177{
178 struct dsmark_qdisc_data *p = PRIV(sch);
179 int i;
180
af0d1141
TG
181 DPRINTK("dsmark_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
182
1da177e4
LT
183 if (walker->stop)
184 return;
af0d1141 185
1da177e4
LT
186 for (i = 0; i < p->indices; i++) {
187 if (p->mask[i] == 0xff && !p->value[i])
0451eb07 188 goto ignore;
1da177e4
LT
189 if (walker->count >= walker->skip) {
190 if (walker->fn(sch, i+1, walker) < 0) {
191 walker->stop = 1;
192 break;
193 }
194 }
0451eb07
TG
195ignore:
196 walker->count++;
1da177e4
LT
197 }
198}
199
1da177e4
LT
200static struct tcf_proto **dsmark_find_tcf(struct Qdisc *sch,unsigned long cl)
201{
af0d1141 202 return &PRIV(sch)->filter_list;
1da177e4
LT
203}
204
1da177e4
LT
205/* --------------------------- Qdisc operations ---------------------------- */
206
1da177e4
LT
207static int dsmark_enqueue(struct sk_buff *skb,struct Qdisc *sch)
208{
209 struct dsmark_qdisc_data *p = PRIV(sch);
af0d1141
TG
210 int err;
211
212 D2PRINTK("dsmark_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
1da177e4 213
1da177e4
LT
214 if (p->set_tc_index) {
215 /* FIXME: Safe with non-linear skbs? --RR */
216 switch (skb->protocol) {
217 case __constant_htons(ETH_P_IP):
218 skb->tc_index = ipv4_get_dsfield(skb->nh.iph)
219 & ~INET_ECN_MASK;
220 break;
221 case __constant_htons(ETH_P_IPV6):
222 skb->tc_index = ipv6_get_dsfield(skb->nh.ipv6h)
223 & ~INET_ECN_MASK;
224 break;
225 default:
226 skb->tc_index = 0;
227 break;
228 };
229 }
af0d1141
TG
230
231 if (TC_H_MAJ(skb->priority) == sch->handle)
1da177e4 232 skb->tc_index = TC_H_MIN(skb->priority);
af0d1141
TG
233 else {
234 struct tcf_result res;
235 int result = tc_classify(skb, p->filter_list, &res);
236
237 D2PRINTK("result %d class 0x%04x\n", result, res.classid);
238
1da177e4
LT
239 switch (result) {
240#ifdef CONFIG_NET_CLS_POLICE
241 case TC_POLICE_SHOT:
242 kfree_skb(skb);
af0d1141
TG
243 sch->qstats.drops++;
244 return NET_XMIT_POLICED;
1da177e4
LT
245#if 0
246 case TC_POLICE_RECLASSIFY:
247 /* FIXME: what to do here ??? */
248#endif
249#endif
250 case TC_POLICE_OK:
251 skb->tc_index = TC_H_MIN(res.classid);
252 break;
253 case TC_POLICE_UNSPEC:
254 /* fall through */
255 default:
256 if (p->default_index != NO_DEFAULT_INDEX)
257 skb->tc_index = p->default_index;
258 break;
259 };
260 }
1da177e4 261
af0d1141
TG
262 err = p->q->enqueue(skb,p->q);
263 if (err != NET_XMIT_SUCCESS) {
1da177e4 264 sch->qstats.drops++;
af0d1141 265 return err;
1da177e4 266 }
af0d1141 267
1da177e4
LT
268 sch->bstats.bytes += skb->len;
269 sch->bstats.packets++;
270 sch->q.qlen++;
1da177e4 271
af0d1141
TG
272 return NET_XMIT_SUCCESS;
273}
1da177e4
LT
274
275static struct sk_buff *dsmark_dequeue(struct Qdisc *sch)
276{
277 struct dsmark_qdisc_data *p = PRIV(sch);
278 struct sk_buff *skb;
af0d1141
TG
279 u32 index;
280
281 D2PRINTK("dsmark_dequeue(sch %p,[qdisc %p])\n", sch, p);
1da177e4 282
1da177e4 283 skb = p->q->ops->dequeue(p->q);
af0d1141 284 if (skb == NULL)
1da177e4 285 return NULL;
af0d1141 286
1da177e4 287 sch->q.qlen--;
af0d1141
TG
288
289 index = skb->tc_index & (p->indices - 1);
290 D2PRINTK("index %d->%d\n", skb->tc_index, index);
291
1da177e4
LT
292 switch (skb->protocol) {
293 case __constant_htons(ETH_P_IP):
af0d1141
TG
294 ipv4_change_dsfield(skb->nh.iph, p->mask[index],
295 p->value[index]);
1da177e4
LT
296 break;
297 case __constant_htons(ETH_P_IPV6):
af0d1141
TG
298 ipv6_change_dsfield(skb->nh.ipv6h, p->mask[index],
299 p->value[index]);
1da177e4
LT
300 break;
301 default:
302 /*
303 * Only complain if a change was actually attempted.
304 * This way, we can send non-IP traffic through dsmark
305 * and don't need yet another qdisc as a bypass.
306 */
307 if (p->mask[index] != 0xff || p->value[index])
308 printk(KERN_WARNING "dsmark_dequeue: "
309 "unsupported protocol %d\n",
66c6f529 310 ntohs(skb->protocol));
1da177e4
LT
311 break;
312 };
af0d1141 313
1da177e4
LT
314 return skb;
315}
316
1da177e4
LT
317static int dsmark_requeue(struct sk_buff *skb,struct Qdisc *sch)
318{
1da177e4 319 struct dsmark_qdisc_data *p = PRIV(sch);
af0d1141 320 int err;
1da177e4 321
af0d1141
TG
322 D2PRINTK("dsmark_requeue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
323
324 err = p->q->ops->requeue(skb, p->q);
325 if (err != NET_XMIT_SUCCESS) {
326 sch->qstats.drops++;
327 return err;
1da177e4 328 }
1da177e4 329
af0d1141
TG
330 sch->q.qlen++;
331 sch->qstats.requeues++;
332
333 return NET_XMIT_SUCCESS;
334}
1da177e4
LT
335
336static unsigned int dsmark_drop(struct Qdisc *sch)
337{
338 struct dsmark_qdisc_data *p = PRIV(sch);
339 unsigned int len;
340
af0d1141
TG
341 DPRINTK("dsmark_reset(sch %p,[qdisc %p])\n", sch, p);
342
343 if (p->q->ops->drop == NULL)
1da177e4 344 return 0;
af0d1141
TG
345
346 len = p->q->ops->drop(p->q);
347 if (len)
348 sch->q.qlen--;
349
1da177e4
LT
350 return len;
351}
352
758cc43c 353static int dsmark_init(struct Qdisc *sch, struct rtattr *opt)
1da177e4
LT
354{
355 struct dsmark_qdisc_data *p = PRIV(sch);
356 struct rtattr *tb[TCA_DSMARK_MAX];
758cc43c
TG
357 int err = -EINVAL;
358 u32 default_index = NO_DEFAULT_INDEX;
359 u16 indices;
360 u8 *mask;
361
362 DPRINTK("dsmark_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
363
364 if (!opt || rtattr_parse_nested(tb, TCA_DSMARK_MAX, opt) < 0)
365 goto errout;
366
367 indices = RTA_GET_U16(tb[TCA_DSMARK_INDICES-1]);
368 if (!indices || !dsmark_valid_indices(indices))
369 goto errout;
370
371 if (tb[TCA_DSMARK_DEFAULT_INDEX-1])
372 default_index = RTA_GET_U16(tb[TCA_DSMARK_DEFAULT_INDEX-1]);
373
374 mask = kmalloc(indices * 2, GFP_KERNEL);
375 if (mask == NULL) {
376 err = -ENOMEM;
377 goto errout;
1da177e4 378 }
758cc43c
TG
379
380 p->mask = mask;
381 memset(p->mask, 0xff, indices);
382
383 p->value = p->mask + indices;
384 memset(p->value, 0, indices);
385
386 p->indices = indices;
387 p->default_index = default_index;
388 p->set_tc_index = RTA_GET_FLAG(tb[TCA_DSMARK_SET_TC_INDEX-1]);
389
390 p->q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops);
391 if (p->q == NULL)
1da177e4 392 p->q = &noop_qdisc;
758cc43c
TG
393
394 DPRINTK("dsmark_init: qdisc %p\n", p->q);
395
396 err = 0;
397errout:
398rtattr_failure:
399 return err;
1da177e4
LT
400}
401
1da177e4
LT
402static void dsmark_reset(struct Qdisc *sch)
403{
404 struct dsmark_qdisc_data *p = PRIV(sch);
405
af0d1141 406 DPRINTK("dsmark_reset(sch %p,[qdisc %p])\n", sch, p);
1da177e4
LT
407 qdisc_reset(p->q);
408 sch->q.qlen = 0;
409}
410
1da177e4
LT
411static void dsmark_destroy(struct Qdisc *sch)
412{
413 struct dsmark_qdisc_data *p = PRIV(sch);
414 struct tcf_proto *tp;
415
af0d1141
TG
416 DPRINTK("dsmark_destroy(sch %p,[qdisc %p])\n", sch, p);
417
1da177e4
LT
418 while (p->filter_list) {
419 tp = p->filter_list;
420 p->filter_list = tp->next;
421 tcf_destroy(tp);
422 }
af0d1141 423
1da177e4
LT
424 qdisc_destroy(p->q);
425 kfree(p->mask);
426}
427
1da177e4 428static int dsmark_dump_class(struct Qdisc *sch, unsigned long cl,
02f23f09 429 struct sk_buff *skb, struct tcmsg *tcm)
1da177e4
LT
430{
431 struct dsmark_qdisc_data *p = PRIV(sch);
02f23f09 432 struct rtattr *opts = NULL;
1da177e4 433
02f23f09
TG
434 DPRINTK("dsmark_dump_class(sch %p,[qdisc %p],class %ld\n", sch, p, cl);
435
436 if (!dsmark_valid_index(p, cl))
1da177e4 437 return -EINVAL;
02f23f09
TG
438
439 tcm->tcm_handle = TC_H_MAKE(TC_H_MAJ(sch->handle), cl-1);
cdc7f8e3 440 tcm->tcm_info = p->q->handle;
02f23f09
TG
441
442 opts = RTA_NEST(skb, TCA_OPTIONS);
443 RTA_PUT_U8(skb,TCA_DSMARK_MASK, p->mask[cl-1]);
444 RTA_PUT_U8(skb,TCA_DSMARK_VALUE, p->value[cl-1]);
445
446 return RTA_NEST_END(skb, opts);
1da177e4
LT
447
448rtattr_failure:
02f23f09 449 return RTA_NEST_CANCEL(skb, opts);
1da177e4
LT
450}
451
452static int dsmark_dump(struct Qdisc *sch, struct sk_buff *skb)
453{
454 struct dsmark_qdisc_data *p = PRIV(sch);
02f23f09 455 struct rtattr *opts = NULL;
1da177e4 456
02f23f09
TG
457 opts = RTA_NEST(skb, TCA_OPTIONS);
458 RTA_PUT_U16(skb, TCA_DSMARK_INDICES, p->indices);
459
460 if (p->default_index != NO_DEFAULT_INDEX)
461 RTA_PUT_U16(skb, TCA_DSMARK_DEFAULT_INDEX, p->default_index);
1da177e4 462
1da177e4 463 if (p->set_tc_index)
02f23f09
TG
464 RTA_PUT_FLAG(skb, TCA_DSMARK_SET_TC_INDEX);
465
466 return RTA_NEST_END(skb, opts);
1da177e4
LT
467
468rtattr_failure:
02f23f09 469 return RTA_NEST_CANCEL(skb, opts);
1da177e4
LT
470}
471
472static struct Qdisc_class_ops dsmark_class_ops = {
473 .graft = dsmark_graft,
474 .leaf = dsmark_leaf,
475 .get = dsmark_get,
476 .put = dsmark_put,
477 .change = dsmark_change,
478 .delete = dsmark_delete,
479 .walk = dsmark_walk,
480 .tcf_chain = dsmark_find_tcf,
481 .bind_tcf = dsmark_bind_filter,
482 .unbind_tcf = dsmark_put,
483 .dump = dsmark_dump_class,
484};
485
486static struct Qdisc_ops dsmark_qdisc_ops = {
487 .next = NULL,
488 .cl_ops = &dsmark_class_ops,
489 .id = "dsmark",
490 .priv_size = sizeof(struct dsmark_qdisc_data),
491 .enqueue = dsmark_enqueue,
492 .dequeue = dsmark_dequeue,
493 .requeue = dsmark_requeue,
494 .drop = dsmark_drop,
495 .init = dsmark_init,
496 .reset = dsmark_reset,
497 .destroy = dsmark_destroy,
498 .change = NULL,
499 .dump = dsmark_dump,
500 .owner = THIS_MODULE,
501};
502
503static int __init dsmark_module_init(void)
504{
505 return register_qdisc(&dsmark_qdisc_ops);
506}
af0d1141 507
1da177e4
LT
508static void __exit dsmark_module_exit(void)
509{
510 unregister_qdisc(&dsmark_qdisc_ops);
511}
af0d1141 512
1da177e4
LT
513module_init(dsmark_module_init)
514module_exit(dsmark_module_exit)
af0d1141 515
1da177e4 516MODULE_LICENSE("GPL");