1 /* net/sched/sch_dsmark.c - Differentiated Services field marker */
2
3 /* Written 1998-2000 by Werner Almesberger, EPFL ICA */
4
5
6 #include <linux/config.h>
7 #include <linux/module.h>
8 #include <linux/types.h>
9 #include <linux/skbuff.h>
10 #include <linux/netdevice.h> /* for pkt_sched */
11 #include <linux/rtnetlink.h>
12 #include <net/pkt_sched.h>
13 #include <net/dsfield.h>
14 #include <asm/byteorder.h>
15
16
17 #if 1 /* control */
18 #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
19 #else
20 #define DPRINTK(format,args...)
21 #endif
22
23 #if 0 /* data */
24 #define D2PRINTK(format,args...) printk(KERN_DEBUG format,##args)
25 #else
26 #define D2PRINTK(format,args...)
27 #endif
28
29
30 #define PRIV(sch) ((struct dsmark_qdisc_data *) (sch)->data)
31
32
33 /*
34 * classid class marking
35 * ------- ----- -------
36 * n/a 0 n/a
37 * x:0 1 use entry [0]
38 * ... ... ...
39 * x:y y>0 y+1 use entry [y]
40 * ... ... ...
41 * x:indices-1 indices use entry [indices-1]
42 */
43
44
45 struct dsmark_qdisc_data {
46 struct Qdisc *q;
47 struct tcf_proto *filter_list;
48 __u8 *mask; /* "owns" the array */
49 __u8 *value;
50 __u16 indices;
51 __u16 default_index;
52 int set_tc_index;
53 };
54
55
56 /* ------------------------- Class/flow operations ------------------------- */
57
58
59 static int dsmark_graft(struct Qdisc *sch,unsigned long arg,
60 struct Qdisc *new,struct Qdisc **old)
61 {
62 struct dsmark_qdisc_data *p = PRIV(sch);
63
64 DPRINTK("dsmark_graft(sch %p,[qdisc %p],new %p,old %p)\n",sch,p,new,
65 old);
66 if (!new)
67 new = &noop_qdisc;
68 sch_tree_lock(sch);
69 *old = xchg(&p->q,new);
70 if (*old)
71 qdisc_reset(*old);
72 sch_tree_unlock(sch); /* @@@ move up ? */
73 return 0;
74 }
75
76
77 static struct Qdisc *dsmark_leaf(struct Qdisc *sch, unsigned long arg)
78 {
79 return NULL;
80 }
81
82
83 static unsigned long dsmark_get(struct Qdisc *sch,u32 classid)
84 {
85 struct dsmark_qdisc_data *p __attribute__((unused)) = PRIV(sch);
86
87 DPRINTK("dsmark_get(sch %p,[qdisc %p],classid %x)\n",sch,p,classid);
88 return TC_H_MIN(classid)+1;
89 }
90
91
92 static unsigned long dsmark_bind_filter(struct Qdisc *sch,
93 unsigned long parent, u32 classid)
94 {
95 return dsmark_get(sch,classid);
96 }
97
98
99 static void dsmark_put(struct Qdisc *sch, unsigned long cl)
100 {
101 }
102
103
104 static int dsmark_change(struct Qdisc *sch, u32 classid, u32 parent,
105 struct rtattr **tca, unsigned long *arg)
106 {
107 struct dsmark_qdisc_data *p = PRIV(sch);
108 struct rtattr *opt = tca[TCA_OPTIONS-1];
109 struct rtattr *tb[TCA_DSMARK_MAX];
110
111 DPRINTK("dsmark_change(sch %p,[qdisc %p],classid %x,parent %x),"
112 "arg 0x%lx\n",sch,p,classid,parent,*arg);
113 if (*arg > p->indices)
114 return -ENOENT;
115 if (!opt || rtattr_parse(tb, TCA_DSMARK_MAX, RTA_DATA(opt),
116 RTA_PAYLOAD(opt)))
117 return -EINVAL;
118 if (tb[TCA_DSMARK_MASK-1]) {
119 if (!RTA_PAYLOAD(tb[TCA_DSMARK_MASK-1]))
120 return -EINVAL;
121 p->mask[*arg-1] = *(__u8 *) RTA_DATA(tb[TCA_DSMARK_MASK-1]);
122 }
123 if (tb[TCA_DSMARK_VALUE-1]) {
124 if (!RTA_PAYLOAD(tb[TCA_DSMARK_VALUE-1]))
125 return -EINVAL;
126 p->value[*arg-1] = *(__u8 *) RTA_DATA(tb[TCA_DSMARK_VALUE-1]);
127 }
128 return 0;
129 }
130
131
132 static int dsmark_delete(struct Qdisc *sch,unsigned long arg)
133 {
134 struct dsmark_qdisc_data *p = PRIV(sch);
135
136 if (!arg || arg > p->indices)
137 return -EINVAL;
138 p->mask[arg-1] = 0xff;
139 p->value[arg-1] = 0;
140 return 0;
141 }
142
143
144 static void dsmark_walk(struct Qdisc *sch,struct qdisc_walker *walker)
145 {
146 struct dsmark_qdisc_data *p = PRIV(sch);
147 int i;
148
149 DPRINTK("dsmark_walk(sch %p,[qdisc %p],walker %p)\n",sch,p,walker);
150 if (walker->stop)
151 return;
152 for (i = 0; i < p->indices; i++) {
153 if (p->mask[i] == 0xff && !p->value[i])
154 continue;
155 if (walker->count >= walker->skip) {
156 if (walker->fn(sch, i+1, walker) < 0) {
157 walker->stop = 1;
158 break;
159 }
160 }
161 walker->count++;
162 }
163 }
164
165
166 static struct tcf_proto **dsmark_find_tcf(struct Qdisc *sch,unsigned long cl)
167 {
168 struct dsmark_qdisc_data *p = PRIV(sch);
169
170 return &p->filter_list;
171 }
172
173
174 /* --------------------------- Qdisc operations ---------------------------- */
175
176
177 static int dsmark_enqueue(struct sk_buff *skb,struct Qdisc *sch)
178 {
179 struct dsmark_qdisc_data *p = PRIV(sch);
180 struct tcf_result res;
181 int result;
182 int ret;
183
184 D2PRINTK("dsmark_enqueue(skb %p,sch %p,[qdisc %p])\n",skb,sch,p);
185 if (p->set_tc_index) {
186 switch (skb->protocol) {
187 case __constant_htons(ETH_P_IP):
188 skb->tc_index = ipv4_get_dsfield(skb->nh.iph);
189 break;
190 case __constant_htons(ETH_P_IPV6):
191 skb->tc_index = ipv6_get_dsfield(skb->nh.ipv6h);
192 break;
193 default:
194 skb->tc_index = 0;
195 break;
196 };
197 }
198 result = TC_POLICE_OK; /* be nice to gcc */
199 if (TC_H_MAJ(skb->priority) == sch->handle) {
200 skb->tc_index = TC_H_MIN(skb->priority);
201 } else {
202 result = tc_classify(skb,p->filter_list,&res);
203 D2PRINTK("result %d class 0x%04x\n",result,res.classid);
204 switch (result) {
205 #ifdef CONFIG_NET_CLS_POLICE
206 case TC_POLICE_SHOT:
207 kfree_skb(skb);
208 break;
209 #if 0
210 case TC_POLICE_RECLASSIFY:
211 /* FIXME: what to do here ??? */
212 #endif
213 #endif
214 case TC_POLICE_OK:
215 skb->tc_index = TC_H_MIN(res.classid);
216 break;
217 case TC_POLICE_UNSPEC:
218 /* fall through */
219 default:
220 if (p->default_index)
221 skb->tc_index = p->default_index;
222 break;
223 };
224 }
225 if (
226 #ifdef CONFIG_NET_CLS_POLICE
227 result == TC_POLICE_SHOT ||
228 #endif
229
230 ((ret = p->q->enqueue(skb,p->q)) != 0)) {
231 sch->stats.drops++;
232 return 0;
233 }
234 sch->stats.bytes += skb->len;
235 sch->stats.packets++;
236 sch->q.qlen++;
237 return ret;
238 }
239
240
241 static struct sk_buff *dsmark_dequeue(struct Qdisc *sch)
242 {
243 struct dsmark_qdisc_data *p = PRIV(sch);
244 struct sk_buff *skb;
245 int index;
246
247 D2PRINTK("dsmark_dequeue(sch %p,[qdisc %p])\n",sch,p);
248 skb = p->q->ops->dequeue(p->q);
249 if (!skb)
250 return NULL;
251 sch->q.qlen--;
252 index = skb->tc_index & (p->indices-1);
253 D2PRINTK("index %d->%d\n",skb->tc_index,index);
254 switch (skb->protocol) {
255 case __constant_htons(ETH_P_IP):
256 ipv4_change_dsfield(skb->nh.iph,
257 p->mask[index],p->value[index]);
258 break;
259 case __constant_htons(ETH_P_IPV6):
260 ipv6_change_dsfield(skb->nh.ipv6h,
261 p->mask[index],p->value[index]);
262 break;
263 default:
264 /*
265 * Only complain if a change was actually attempted.
266 * This way, we can send non-IP traffic through dsmark
267 * and don't need yet another qdisc as a bypass.
268 */
269 if (p->mask[index] != 0xff || p->value[index])
270 printk(KERN_WARNING "dsmark_dequeue: "
271 "unsupported protocol %d\n",
272 htons(skb->protocol));
273 break;
274 };
275 return skb;
276 }
277
278
279 static int dsmark_requeue(struct sk_buff *skb,struct Qdisc *sch)
280 {
281 int ret;
282 struct dsmark_qdisc_data *p = PRIV(sch);
283
284 D2PRINTK("dsmark_requeue(skb %p,sch %p,[qdisc %p])\n",skb,sch,p);
285 if ((ret = p->q->ops->requeue(skb, p->q)) == 0) {
286 sch->q.qlen++;
287 return 0;
288 }
289 sch->stats.drops++;
290 return ret;
291 }
292
293
294 static int dsmark_drop(struct Qdisc *sch)
295 {
296 struct dsmark_qdisc_data *p = PRIV(sch);
297
298 DPRINTK("dsmark_reset(sch %p,[qdisc %p])\n",sch,p);
299 if (!p->q->ops->drop)
300 return 0;
301 if (!p->q->ops->drop(p->q))
302 return 0;
303 sch->q.qlen--;
304 return 1;
305 }
306
307
308 int dsmark_init(struct Qdisc *sch,struct rtattr *opt)
309 {
310 struct dsmark_qdisc_data *p = PRIV(sch);
311 struct rtattr *tb[TCA_DSMARK_MAX];
312 __u16 tmp;
313
314 DPRINTK("dsmark_init(sch %p,[qdisc %p],opt %p)\n",sch,p,opt);
315 if (rtattr_parse(tb,TCA_DSMARK_MAX,RTA_DATA(opt),RTA_PAYLOAD(opt)) < 0 ||
316 !tb[TCA_DSMARK_INDICES-1] ||
317 RTA_PAYLOAD(tb[TCA_DSMARK_INDICES-1]) < sizeof(__u16))
318 return -EINVAL;
319 memset(p,0,sizeof(*p));
320 p->filter_list = NULL;
321 p->indices = *(__u16 *) RTA_DATA(tb[TCA_DSMARK_INDICES-1]);
322 if (!p->indices)
323 return -EINVAL;
324 for (tmp = p->indices; tmp != 1; tmp >>= 1) {
325 if (tmp & 1)
326 return -EINVAL;
327 }
328 p->default_index = 0;
329 if (tb[TCA_DSMARK_DEFAULT_INDEX-1]) {
330 if (RTA_PAYLOAD(tb[TCA_DSMARK_DEFAULT_INDEX-1]) < sizeof(__u16))
331 return -EINVAL;
332 p->default_index =
333 *(__u16 *) RTA_DATA(tb[TCA_DSMARK_DEFAULT_INDEX-1]);
334 if (!p->default_index || p->default_index >= p->indices)
335 return -EINVAL;
336 }
337 p->set_tc_index = !!tb[TCA_DSMARK_SET_TC_INDEX-1];
338 p->mask = kmalloc(p->indices*2,GFP_KERNEL);
339 if (!p->mask)
340 return -ENOMEM;
341 p->value = p->mask+p->indices;
342 memset(p->mask,0xff,p->indices);
343 memset(p->value,0,p->indices);
344 if (!(p->q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops)))
345 p->q = &noop_qdisc;
346 DPRINTK("dsmark_init: qdisc %p\n",&p->q);
347 MOD_INC_USE_COUNT;
348 return 0;
349 }
350
351
352 static void dsmark_reset(struct Qdisc *sch)
353 {
354 struct dsmark_qdisc_data *p = PRIV(sch);
355
356 DPRINTK("dsmark_reset(sch %p,[qdisc %p])\n",sch,p);
357 qdisc_reset(p->q);
358 sch->q.qlen = 0;
359 }
360
361
362 static void dsmark_destroy(struct Qdisc *sch)
363 {
364 struct dsmark_qdisc_data *p = PRIV(sch);
365 struct tcf_proto *tp;
366
367 DPRINTK("dsmark_destroy(sch %p,[qdisc %p])\n",sch,p);
368 while (p->filter_list) {
369 tp = p->filter_list;
370 p->filter_list = tp->next;
371 tp->ops->destroy(tp);
372 }
373 qdisc_destroy(p->q);
374 p->q = &noop_qdisc;
375 kfree(p->mask);
376 MOD_DEC_USE_COUNT;
377 }
378
379
380 #ifdef CONFIG_RTNETLINK
381
382 static int dsmark_dump_class(struct Qdisc *sch, unsigned long cl,
383 struct sk_buff *skb, struct tcmsg *tcm)
384 {
385 struct dsmark_qdisc_data *p = PRIV(sch);
386 unsigned char *b = skb->tail;
387 struct rtattr *rta;
388
389 DPRINTK("dsmark_dump_class(sch %p,[qdisc %p],class %ld\n",sch,p,cl);
390 if (!cl || cl > p->indices)
391 return -EINVAL;
392 tcm->tcm_handle = TC_H_MAKE(TC_H_MAJ(sch->handle),cl-1);
393 rta = (struct rtattr *) b;
394 RTA_PUT(skb,TCA_OPTIONS,0,NULL);
395 RTA_PUT(skb,TCA_DSMARK_MASK,1,&p->mask[cl-1]);
396 RTA_PUT(skb,TCA_DSMARK_VALUE,1,&p->value[cl-1]);
397 rta->rta_len = skb->tail-b;
398 return skb->len;
399
400 rtattr_failure:
401 skb_trim(skb,b-skb->data);
402 return -1;
403 }
404
405 static int dsmark_dump(struct Qdisc *sch, struct sk_buff *skb)
406 {
407 struct dsmark_qdisc_data *p = PRIV(sch);
408 unsigned char *b = skb->tail;
409 struct rtattr *rta;
410
411 rta = (struct rtattr *) b;
412 RTA_PUT(skb,TCA_OPTIONS,0,NULL);
413 RTA_PUT(skb,TCA_DSMARK_INDICES,sizeof(__u16),&p->indices);
414 if (p->default_index)
415 RTA_PUT(skb,TCA_DSMARK_DEFAULT_INDEX, sizeof(__u16),
416 &p->default_index);
417 if (p->set_tc_index)
418 RTA_PUT(skb, TCA_DSMARK_SET_TC_INDEX, 0, NULL);
419 rta->rta_len = skb->tail-b;
420 return skb->len;
421
422 rtattr_failure:
423 skb_trim(skb,b-skb->data);
424 return -1;
425 }
426
427 #endif
428
429
430 static struct Qdisc_class_ops dsmark_class_ops =
431 {
432 dsmark_graft, /* graft */
433 dsmark_leaf, /* leaf */
434 dsmark_get, /* get */
435 dsmark_put, /* put */
436 dsmark_change, /* change */
437 dsmark_delete, /* delete */
438 dsmark_walk, /* walk */
439
440 dsmark_find_tcf, /* tcf_chain */
441 dsmark_bind_filter, /* bind_tcf */
442 dsmark_put, /* unbind_tcf */
443
444 #ifdef CONFIG_RTNETLINK
445 dsmark_dump_class, /* dump */
446 #endif
447 };
448
449 struct Qdisc_ops dsmark_qdisc_ops =
450 {
451 NULL, /* next */
452 &dsmark_class_ops, /* cl_ops */
453 "dsmark",
454 sizeof(struct dsmark_qdisc_data),
455
456 dsmark_enqueue, /* enqueue */
457 dsmark_dequeue, /* dequeue */
458 dsmark_requeue, /* requeue */
459 dsmark_drop, /* drop */
460
461 dsmark_init, /* init */
462 dsmark_reset, /* reset */
463 dsmark_destroy, /* destroy */
464 NULL, /* change */
465
466 #ifdef CONFIG_RTNETLINK
467 dsmark_dump /* dump */
468 #endif
469 };
470
471 #ifdef MODULE
472 int init_module(void)
473 {
474 return register_qdisc(&dsmark_qdisc_ops);
475 }
476
477
478 void cleanup_module(void)
479 {
480 unregister_qdisc(&dsmark_qdisc_ops);
481 }
482 #endif
483
This page was automatically generated by the
LXR engine.
Visit the LXR main site for more
information.