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7#include <linux/module.h>
8#include <linux/init.h>
9#include <linux/slab.h>
10#include <linux/types.h>
11#include <linux/string.h>
12#include <linux/errno.h>
13#include <linux/skbuff.h>
14#include <linux/rtnetlink.h>
15#include <linux/bitops.h>
16#include <net/pkt_sched.h>
17#include <net/pkt_cls.h>
18#include <net/dsfield.h>
19#include <net/inet_ecn.h>
20#include <asm/byteorder.h>
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38#define NO_DEFAULT_INDEX (1 << 16)
39
40struct mask_value {
41 u8 mask;
42 u8 value;
43};
44
45struct dsmark_qdisc_data {
46 struct Qdisc *q;
47 struct tcf_proto __rcu *filter_list;
48 struct tcf_block *block;
49 struct mask_value *mv;
50 u16 indices;
51 u8 set_tc_index;
52 u32 default_index;
53#define DSMARK_EMBEDDED_SZ 16
54 struct mask_value embedded[DSMARK_EMBEDDED_SZ];
55};
56
57static inline int dsmark_valid_index(struct dsmark_qdisc_data *p, u16 index)
58{
59 return index <= p->indices && index > 0;
60}
61
62
63
64static int dsmark_graft(struct Qdisc *sch, unsigned long arg,
65 struct Qdisc *new, struct Qdisc **old,
66 struct netlink_ext_ack *extack)
67{
68 struct dsmark_qdisc_data *p = qdisc_priv(sch);
69
70 pr_debug("%s(sch %p,[qdisc %p],new %p,old %p)\n",
71 __func__, sch, p, new, old);
72
73 if (new == NULL) {
74 new = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops,
75 sch->handle, NULL);
76 if (new == NULL)
77 new = &noop_qdisc;
78 }
79
80 *old = qdisc_replace(sch, new, &p->q);
81 return 0;
82}
83
84static struct Qdisc *dsmark_leaf(struct Qdisc *sch, unsigned long arg)
85{
86 struct dsmark_qdisc_data *p = qdisc_priv(sch);
87 return p->q;
88}
89
90static unsigned long dsmark_find(struct Qdisc *sch, u32 classid)
91{
92 return TC_H_MIN(classid) + 1;
93}
94
95static unsigned long dsmark_bind_filter(struct Qdisc *sch,
96 unsigned long parent, u32 classid)
97{
98 pr_debug("%s(sch %p,[qdisc %p],classid %x)\n",
99 __func__, sch, qdisc_priv(sch), classid);
100
101 return dsmark_find(sch, classid);
102}
103
104static void dsmark_unbind_filter(struct Qdisc *sch, unsigned long cl)
105{
106}
107
108static const struct nla_policy dsmark_policy[TCA_DSMARK_MAX + 1] = {
109 [TCA_DSMARK_INDICES] = { .type = NLA_U16 },
110 [TCA_DSMARK_DEFAULT_INDEX] = { .type = NLA_U16 },
111 [TCA_DSMARK_SET_TC_INDEX] = { .type = NLA_FLAG },
112 [TCA_DSMARK_MASK] = { .type = NLA_U8 },
113 [TCA_DSMARK_VALUE] = { .type = NLA_U8 },
114};
115
116static int dsmark_change(struct Qdisc *sch, u32 classid, u32 parent,
117 struct nlattr **tca, unsigned long *arg,
118 struct netlink_ext_ack *extack)
119{
120 struct dsmark_qdisc_data *p = qdisc_priv(sch);
121 struct nlattr *opt = tca[TCA_OPTIONS];
122 struct nlattr *tb[TCA_DSMARK_MAX + 1];
123 int err = -EINVAL;
124
125 pr_debug("%s(sch %p,[qdisc %p],classid %x,parent %x), arg 0x%lx\n",
126 __func__, sch, p, classid, parent, *arg);
127
128 if (!dsmark_valid_index(p, *arg)) {
129 err = -ENOENT;
130 goto errout;
131 }
132
133 if (!opt)
134 goto errout;
135
136 err = nla_parse_nested_deprecated(tb, TCA_DSMARK_MAX, opt,
137 dsmark_policy, NULL);
138 if (err < 0)
139 goto errout;
140
141 if (tb[TCA_DSMARK_VALUE])
142 p->mv[*arg - 1].value = nla_get_u8(tb[TCA_DSMARK_VALUE]);
143
144 if (tb[TCA_DSMARK_MASK])
145 p->mv[*arg - 1].mask = nla_get_u8(tb[TCA_DSMARK_MASK]);
146
147 err = 0;
148
149errout:
150 return err;
151}
152
153static int dsmark_delete(struct Qdisc *sch, unsigned long arg)
154{
155 struct dsmark_qdisc_data *p = qdisc_priv(sch);
156
157 if (!dsmark_valid_index(p, arg))
158 return -EINVAL;
159
160 p->mv[arg - 1].mask = 0xff;
161 p->mv[arg - 1].value = 0;
162
163 return 0;
164}
165
166static void dsmark_walk(struct Qdisc *sch, struct qdisc_walker *walker)
167{
168 struct dsmark_qdisc_data *p = qdisc_priv(sch);
169 int i;
170
171 pr_debug("%s(sch %p,[qdisc %p],walker %p)\n",
172 __func__, sch, p, walker);
173
174 if (walker->stop)
175 return;
176
177 for (i = 0; i < p->indices; i++) {
178 if (p->mv[i].mask == 0xff && !p->mv[i].value)
179 goto ignore;
180 if (walker->count >= walker->skip) {
181 if (walker->fn(sch, i + 1, walker) < 0) {
182 walker->stop = 1;
183 break;
184 }
185 }
186ignore:
187 walker->count++;
188 }
189}
190
191static struct tcf_block *dsmark_tcf_block(struct Qdisc *sch, unsigned long cl,
192 struct netlink_ext_ack *extack)
193{
194 struct dsmark_qdisc_data *p = qdisc_priv(sch);
195
196 return p->block;
197}
198
199
200
201static int dsmark_enqueue(struct sk_buff *skb, struct Qdisc *sch,
202 struct sk_buff **to_free)
203{
204 unsigned int len = qdisc_pkt_len(skb);
205 struct dsmark_qdisc_data *p = qdisc_priv(sch);
206 int err;
207
208 pr_debug("%s(skb %p,sch %p,[qdisc %p])\n", __func__, skb, sch, p);
209
210 if (p->set_tc_index) {
211 int wlen = skb_network_offset(skb);
212
213 switch (tc_skb_protocol(skb)) {
214 case htons(ETH_P_IP):
215 wlen += sizeof(struct iphdr);
216 if (!pskb_may_pull(skb, wlen) ||
217 skb_try_make_writable(skb, wlen))
218 goto drop;
219
220 skb->tc_index = ipv4_get_dsfield(ip_hdr(skb))
221 & ~INET_ECN_MASK;
222 break;
223
224 case htons(ETH_P_IPV6):
225 wlen += sizeof(struct ipv6hdr);
226 if (!pskb_may_pull(skb, wlen) ||
227 skb_try_make_writable(skb, wlen))
228 goto drop;
229
230 skb->tc_index = ipv6_get_dsfield(ipv6_hdr(skb))
231 & ~INET_ECN_MASK;
232 break;
233 default:
234 skb->tc_index = 0;
235 break;
236 }
237 }
238
239 if (TC_H_MAJ(skb->priority) == sch->handle)
240 skb->tc_index = TC_H_MIN(skb->priority);
241 else {
242 struct tcf_result res;
243 struct tcf_proto *fl = rcu_dereference_bh(p->filter_list);
244 int result = tcf_classify(skb, fl, &res, false);
245
246 pr_debug("result %d class 0x%04x\n", result, res.classid);
247
248 switch (result) {
249#ifdef CONFIG_NET_CLS_ACT
250 case TC_ACT_QUEUED:
251 case TC_ACT_STOLEN:
252 case TC_ACT_TRAP:
253 __qdisc_drop(skb, to_free);
254 return NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
255
256 case TC_ACT_SHOT:
257 goto drop;
258#endif
259 case TC_ACT_OK:
260 skb->tc_index = TC_H_MIN(res.classid);
261 break;
262
263 default:
264 if (p->default_index != NO_DEFAULT_INDEX)
265 skb->tc_index = p->default_index;
266 break;
267 }
268 }
269
270 err = qdisc_enqueue(skb, p->q, to_free);
271 if (err != NET_XMIT_SUCCESS) {
272 if (net_xmit_drop_count(err))
273 qdisc_qstats_drop(sch);
274 return err;
275 }
276
277 sch->qstats.backlog += len;
278 sch->q.qlen++;
279
280 return NET_XMIT_SUCCESS;
281
282drop:
283 qdisc_drop(skb, sch, to_free);
284 return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
285}
286
287static struct sk_buff *dsmark_dequeue(struct Qdisc *sch)
288{
289 struct dsmark_qdisc_data *p = qdisc_priv(sch);
290 struct sk_buff *skb;
291 u32 index;
292
293 pr_debug("%s(sch %p,[qdisc %p])\n", __func__, sch, p);
294
295 skb = qdisc_dequeue_peeked(p->q);
296 if (skb == NULL)
297 return NULL;
298
299 qdisc_bstats_update(sch, skb);
300 qdisc_qstats_backlog_dec(sch, skb);
301 sch->q.qlen--;
302
303 index = skb->tc_index & (p->indices - 1);
304 pr_debug("index %d->%d\n", skb->tc_index, index);
305
306 switch (tc_skb_protocol(skb)) {
307 case htons(ETH_P_IP):
308 ipv4_change_dsfield(ip_hdr(skb), p->mv[index].mask,
309 p->mv[index].value);
310 break;
311 case htons(ETH_P_IPV6):
312 ipv6_change_dsfield(ipv6_hdr(skb), p->mv[index].mask,
313 p->mv[index].value);
314 break;
315 default:
316
317
318
319
320
321 if (p->mv[index].mask != 0xff || p->mv[index].value)
322 pr_warn("%s: unsupported protocol %d\n",
323 __func__, ntohs(tc_skb_protocol(skb)));
324 break;
325 }
326
327 return skb;
328}
329
330static struct sk_buff *dsmark_peek(struct Qdisc *sch)
331{
332 struct dsmark_qdisc_data *p = qdisc_priv(sch);
333
334 pr_debug("%s(sch %p,[qdisc %p])\n", __func__, sch, p);
335
336 return p->q->ops->peek(p->q);
337}
338
339static int dsmark_init(struct Qdisc *sch, struct nlattr *opt,
340 struct netlink_ext_ack *extack)
341{
342 struct dsmark_qdisc_data *p = qdisc_priv(sch);
343 struct nlattr *tb[TCA_DSMARK_MAX + 1];
344 int err = -EINVAL;
345 u32 default_index = NO_DEFAULT_INDEX;
346 u16 indices;
347 int i;
348
349 pr_debug("%s(sch %p,[qdisc %p],opt %p)\n", __func__, sch, p, opt);
350
351 if (!opt)
352 goto errout;
353
354 err = tcf_block_get(&p->block, &p->filter_list, sch, extack);
355 if (err)
356 return err;
357
358 err = nla_parse_nested_deprecated(tb, TCA_DSMARK_MAX, opt,
359 dsmark_policy, NULL);
360 if (err < 0)
361 goto errout;
362
363 err = -EINVAL;
364 indices = nla_get_u16(tb[TCA_DSMARK_INDICES]);
365
366 if (hweight32(indices) != 1)
367 goto errout;
368
369 if (tb[TCA_DSMARK_DEFAULT_INDEX])
370 default_index = nla_get_u16(tb[TCA_DSMARK_DEFAULT_INDEX]);
371
372 if (indices <= DSMARK_EMBEDDED_SZ)
373 p->mv = p->embedded;
374 else
375 p->mv = kmalloc_array(indices, sizeof(*p->mv), GFP_KERNEL);
376 if (!p->mv) {
377 err = -ENOMEM;
378 goto errout;
379 }
380 for (i = 0; i < indices; i++) {
381 p->mv[i].mask = 0xff;
382 p->mv[i].value = 0;
383 }
384 p->indices = indices;
385 p->default_index = default_index;
386 p->set_tc_index = nla_get_flag(tb[TCA_DSMARK_SET_TC_INDEX]);
387
388 p->q = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, sch->handle,
389 NULL);
390 if (p->q == NULL)
391 p->q = &noop_qdisc;
392 else
393 qdisc_hash_add(p->q, true);
394
395 pr_debug("%s: qdisc %p\n", __func__, p->q);
396
397 err = 0;
398errout:
399 return err;
400}
401
402static void dsmark_reset(struct Qdisc *sch)
403{
404 struct dsmark_qdisc_data *p = qdisc_priv(sch);
405
406 pr_debug("%s(sch %p,[qdisc %p])\n", __func__, sch, p);
407 qdisc_reset(p->q);
408 sch->qstats.backlog = 0;
409 sch->q.qlen = 0;
410}
411
412static void dsmark_destroy(struct Qdisc *sch)
413{
414 struct dsmark_qdisc_data *p = qdisc_priv(sch);
415
416 pr_debug("%s(sch %p,[qdisc %p])\n", __func__, sch, p);
417
418 tcf_block_put(p->block);
419 qdisc_put(p->q);
420 if (p->mv != p->embedded)
421 kfree(p->mv);
422}
423
424static int dsmark_dump_class(struct Qdisc *sch, unsigned long cl,
425 struct sk_buff *skb, struct tcmsg *tcm)
426{
427 struct dsmark_qdisc_data *p = qdisc_priv(sch);
428 struct nlattr *opts = NULL;
429
430 pr_debug("%s(sch %p,[qdisc %p],class %ld\n", __func__, sch, p, cl);
431
432 if (!dsmark_valid_index(p, cl))
433 return -EINVAL;
434
435 tcm->tcm_handle = TC_H_MAKE(TC_H_MAJ(sch->handle), cl - 1);
436 tcm->tcm_info = p->q->handle;
437
438 opts = nla_nest_start_noflag(skb, TCA_OPTIONS);
439 if (opts == NULL)
440 goto nla_put_failure;
441 if (nla_put_u8(skb, TCA_DSMARK_MASK, p->mv[cl - 1].mask) ||
442 nla_put_u8(skb, TCA_DSMARK_VALUE, p->mv[cl - 1].value))
443 goto nla_put_failure;
444
445 return nla_nest_end(skb, opts);
446
447nla_put_failure:
448 nla_nest_cancel(skb, opts);
449 return -EMSGSIZE;
450}
451
452static int dsmark_dump(struct Qdisc *sch, struct sk_buff *skb)
453{
454 struct dsmark_qdisc_data *p = qdisc_priv(sch);
455 struct nlattr *opts = NULL;
456
457 opts = nla_nest_start_noflag(skb, TCA_OPTIONS);
458 if (opts == NULL)
459 goto nla_put_failure;
460 if (nla_put_u16(skb, TCA_DSMARK_INDICES, p->indices))
461 goto nla_put_failure;
462
463 if (p->default_index != NO_DEFAULT_INDEX &&
464 nla_put_u16(skb, TCA_DSMARK_DEFAULT_INDEX, p->default_index))
465 goto nla_put_failure;
466
467 if (p->set_tc_index &&
468 nla_put_flag(skb, TCA_DSMARK_SET_TC_INDEX))
469 goto nla_put_failure;
470
471 return nla_nest_end(skb, opts);
472
473nla_put_failure:
474 nla_nest_cancel(skb, opts);
475 return -EMSGSIZE;
476}
477
478static const struct Qdisc_class_ops dsmark_class_ops = {
479 .graft = dsmark_graft,
480 .leaf = dsmark_leaf,
481 .find = dsmark_find,
482 .change = dsmark_change,
483 .delete = dsmark_delete,
484 .walk = dsmark_walk,
485 .tcf_block = dsmark_tcf_block,
486 .bind_tcf = dsmark_bind_filter,
487 .unbind_tcf = dsmark_unbind_filter,
488 .dump = dsmark_dump_class,
489};
490
491static struct Qdisc_ops dsmark_qdisc_ops __read_mostly = {
492 .next = NULL,
493 .cl_ops = &dsmark_class_ops,
494 .id = "dsmark",
495 .priv_size = sizeof(struct dsmark_qdisc_data),
496 .enqueue = dsmark_enqueue,
497 .dequeue = dsmark_dequeue,
498 .peek = dsmark_peek,
499 .init = dsmark_init,
500 .reset = dsmark_reset,
501 .destroy = dsmark_destroy,
502 .change = NULL,
503 .dump = dsmark_dump,
504 .owner = THIS_MODULE,
505};
506
507static int __init dsmark_module_init(void)
508{
509 return register_qdisc(&dsmark_qdisc_ops);
510}
511
512static void __exit dsmark_module_exit(void)
513{
514 unregister_qdisc(&dsmark_qdisc_ops);
515}
516
517module_init(dsmark_module_init)
518module_exit(dsmark_module_exit)
519
520MODULE_LICENSE("GPL");
521
