1 /* net/sched/sch_dsmark.c - Differentiated Services field marker */
3 /* Written 1998-2000 by Werner Almesberger, EPFL ICA */
6 #include <linux/config.h>
7 #include <linux/module.h>
8 #include <linux/init.h>
9 #include <linux/types.h>
10 #include <linux/string.h>
11 #include <linux/errno.h>
12 #include <linux/skbuff.h>
13 #include <linux/netdevice.h> /* for pkt_sched */
14 #include <linux/rtnetlink.h>
15 #include <net/pkt_sched.h>
16 #include <net/dsfield.h>
17 #include <net/inet_ecn.h>
18 #include <asm/byteorder.h>
22 #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
24 #define DPRINTK(format,args...)
28 #define D2PRINTK(format,args...) printk(KERN_DEBUG format,##args)
30 #define D2PRINTK(format,args...)
34 #define PRIV(sch) qdisc_priv(sch)
38 * classid class marking
39 * ------- ----- -------
43 * x:y y>0 y+1 use entry [y]
45 * x:indices-1 indices use entry [indices-1]
47 * x:y y+1 use entry [y & (indices-1)]
49 * 0xffff 0x10000 use entry [indices-1]
53 #define NO_DEFAULT_INDEX (1 << 16)
55 struct dsmark_qdisc_data {
57 struct tcf_proto *filter_list;
58 __u8 *mask; /* "owns" the array */
61 __u32 default_index; /* index range is 0...0xffff */
66 /* ------------------------- Class/flow operations ------------------------- */
69 static int dsmark_graft(struct Qdisc *sch,unsigned long arg,
70 struct Qdisc *new,struct Qdisc **old)
72 struct dsmark_qdisc_data *p = PRIV(sch);
74 DPRINTK("dsmark_graft(sch %p,[qdisc %p],new %p,old %p)\n",sch,p,new,
79 *old = xchg(&p->q,new);
83 sch_tree_unlock(sch); /* @@@ move up ? */
88 static struct Qdisc *dsmark_leaf(struct Qdisc *sch, unsigned long arg)
90 struct dsmark_qdisc_data *p = PRIV(sch);
96 static unsigned long dsmark_get(struct Qdisc *sch,u32 classid)
98 struct dsmark_qdisc_data *p __attribute__((unused)) = PRIV(sch);
100 DPRINTK("dsmark_get(sch %p,[qdisc %p],classid %x)\n",sch,p,classid);
101 return TC_H_MIN(classid)+1;
105 static unsigned long dsmark_bind_filter(struct Qdisc *sch,
106 unsigned long parent, u32 classid)
108 return dsmark_get(sch,classid);
112 static void dsmark_put(struct Qdisc *sch, unsigned long cl)
117 static int dsmark_change(struct Qdisc *sch, u32 classid, u32 parent,
118 struct rtattr **tca, unsigned long *arg)
120 struct dsmark_qdisc_data *p = PRIV(sch);
121 struct rtattr *opt = tca[TCA_OPTIONS-1];
122 struct rtattr *tb[TCA_DSMARK_MAX];
124 DPRINTK("dsmark_change(sch %p,[qdisc %p],classid %x,parent %x),"
125 "arg 0x%lx\n",sch,p,classid,parent,*arg);
126 if (*arg > p->indices)
128 if (!opt || rtattr_parse_nested(tb, TCA_DSMARK_MAX, opt))
130 if (tb[TCA_DSMARK_MASK-1]) {
131 if (!RTA_PAYLOAD(tb[TCA_DSMARK_MASK-1]))
133 p->mask[*arg-1] = *(__u8 *) RTA_DATA(tb[TCA_DSMARK_MASK-1]);
135 if (tb[TCA_DSMARK_VALUE-1]) {
136 if (!RTA_PAYLOAD(tb[TCA_DSMARK_VALUE-1]))
138 p->value[*arg-1] = *(__u8 *) RTA_DATA(tb[TCA_DSMARK_VALUE-1]);
144 static int dsmark_delete(struct Qdisc *sch,unsigned long arg)
146 struct dsmark_qdisc_data *p = PRIV(sch);
148 if (!arg || arg > p->indices)
150 p->mask[arg-1] = 0xff;
156 static void dsmark_walk(struct Qdisc *sch,struct qdisc_walker *walker)
158 struct dsmark_qdisc_data *p = PRIV(sch);
161 DPRINTK("dsmark_walk(sch %p,[qdisc %p],walker %p)\n",sch,p,walker);
164 for (i = 0; i < p->indices; i++) {
165 if (p->mask[i] == 0xff && !p->value[i])
167 if (walker->count >= walker->skip) {
168 if (walker->fn(sch, i+1, walker) < 0) {
179 static struct tcf_proto **dsmark_find_tcf(struct Qdisc *sch,unsigned long cl)
181 struct dsmark_qdisc_data *p = PRIV(sch);
183 return &p->filter_list;
187 /* --------------------------- Qdisc operations ---------------------------- */
190 static int dsmark_enqueue(struct sk_buff *skb,struct Qdisc *sch)
192 struct dsmark_qdisc_data *p = PRIV(sch);
193 struct tcf_result res;
195 int ret = NET_XMIT_POLICED;
197 D2PRINTK("dsmark_enqueue(skb %p,sch %p,[qdisc %p])\n",skb,sch,p);
198 if (p->set_tc_index) {
199 /* FIXME: Safe with non-linear skbs? --RR */
200 switch (skb->protocol) {
201 case __constant_htons(ETH_P_IP):
202 skb->tc_index = ipv4_get_dsfield(skb->nh.iph)
205 case __constant_htons(ETH_P_IPV6):
206 skb->tc_index = ipv6_get_dsfield(skb->nh.ipv6h)
214 result = TC_POLICE_OK; /* be nice to gcc */
215 if (TC_H_MAJ(skb->priority) == sch->handle) {
216 skb->tc_index = TC_H_MIN(skb->priority);
218 result = tc_classify(skb,p->filter_list,&res);
219 D2PRINTK("result %d class 0x%04x\n",result,res.classid);
221 #ifdef CONFIG_NET_CLS_POLICE
226 case TC_POLICE_RECLASSIFY:
227 /* FIXME: what to do here ??? */
231 skb->tc_index = TC_H_MIN(res.classid);
233 case TC_POLICE_UNSPEC:
236 if (p->default_index != NO_DEFAULT_INDEX)
237 skb->tc_index = p->default_index;
242 #ifdef CONFIG_NET_CLS_POLICE
243 result == TC_POLICE_SHOT ||
246 ((ret = p->q->enqueue(skb,p->q)) != 0)) {
250 sch->bstats.bytes += skb->len;
251 sch->bstats.packets++;
257 static struct sk_buff *dsmark_dequeue(struct Qdisc *sch)
259 struct dsmark_qdisc_data *p = PRIV(sch);
263 D2PRINTK("dsmark_dequeue(sch %p,[qdisc %p])\n",sch,p);
264 skb = p->q->ops->dequeue(p->q);
268 index = skb->tc_index & (p->indices-1);
269 D2PRINTK("index %d->%d\n",skb->tc_index,index);
270 switch (skb->protocol) {
271 case __constant_htons(ETH_P_IP):
272 ipv4_change_dsfield(skb->nh.iph,
273 p->mask[index],p->value[index]);
275 case __constant_htons(ETH_P_IPV6):
276 ipv6_change_dsfield(skb->nh.ipv6h,
277 p->mask[index],p->value[index]);
281 * Only complain if a change was actually attempted.
282 * This way, we can send non-IP traffic through dsmark
283 * and don't need yet another qdisc as a bypass.
285 if (p->mask[index] != 0xff || p->value[index])
286 printk(KERN_WARNING "dsmark_dequeue: "
287 "unsupported protocol %d\n",
288 htons(skb->protocol));
295 static int dsmark_requeue(struct sk_buff *skb,struct Qdisc *sch)
298 struct dsmark_qdisc_data *p = PRIV(sch);
300 D2PRINTK("dsmark_requeue(skb %p,sch %p,[qdisc %p])\n",skb,sch,p);
301 if ((ret = p->q->ops->requeue(skb, p->q)) == 0) {
303 sch->qstats.requeues++;
311 static unsigned int dsmark_drop(struct Qdisc *sch)
313 struct dsmark_qdisc_data *p = PRIV(sch);
316 DPRINTK("dsmark_reset(sch %p,[qdisc %p])\n",sch,p);
317 if (!p->q->ops->drop)
319 if (!(len = p->q->ops->drop(p->q)))
326 static int dsmark_init(struct Qdisc *sch,struct rtattr *opt)
328 struct dsmark_qdisc_data *p = PRIV(sch);
329 struct rtattr *tb[TCA_DSMARK_MAX];
332 DPRINTK("dsmark_init(sch %p,[qdisc %p],opt %p)\n",sch,p,opt);
334 rtattr_parse(tb,TCA_DSMARK_MAX,RTA_DATA(opt),RTA_PAYLOAD(opt)) < 0 ||
335 !tb[TCA_DSMARK_INDICES-1] ||
336 RTA_PAYLOAD(tb[TCA_DSMARK_INDICES-1]) < sizeof(__u16))
338 p->indices = *(__u16 *) RTA_DATA(tb[TCA_DSMARK_INDICES-1]);
341 for (tmp = p->indices; tmp != 1; tmp >>= 1) {
345 p->default_index = NO_DEFAULT_INDEX;
346 if (tb[TCA_DSMARK_DEFAULT_INDEX-1]) {
347 if (RTA_PAYLOAD(tb[TCA_DSMARK_DEFAULT_INDEX-1]) < sizeof(__u16))
350 *(__u16 *) RTA_DATA(tb[TCA_DSMARK_DEFAULT_INDEX-1]);
352 p->set_tc_index = !!tb[TCA_DSMARK_SET_TC_INDEX-1];
353 p->mask = kmalloc(p->indices*2,GFP_KERNEL);
356 p->value = p->mask+p->indices;
357 memset(p->mask,0xff,p->indices);
358 memset(p->value,0,p->indices);
359 if (!(p->q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops)))
361 DPRINTK("dsmark_init: qdisc %p\n",&p->q);
366 static void dsmark_reset(struct Qdisc *sch)
368 struct dsmark_qdisc_data *p = PRIV(sch);
370 DPRINTK("dsmark_reset(sch %p,[qdisc %p])\n",sch,p);
376 static void dsmark_destroy(struct Qdisc *sch)
378 struct dsmark_qdisc_data *p = PRIV(sch);
379 struct tcf_proto *tp;
381 DPRINTK("dsmark_destroy(sch %p,[qdisc %p])\n",sch,p);
382 while (p->filter_list) {
384 p->filter_list = tp->next;
392 static int dsmark_dump_class(struct Qdisc *sch, unsigned long cl,
393 struct sk_buff *skb, struct tcmsg *tcm)
395 struct dsmark_qdisc_data *p = PRIV(sch);
396 unsigned char *b = skb->tail;
399 DPRINTK("dsmark_dump_class(sch %p,[qdisc %p],class %ld\n",sch,p,cl);
400 if (!cl || cl > p->indices)
402 tcm->tcm_handle = TC_H_MAKE(TC_H_MAJ(sch->handle),cl-1);
403 rta = (struct rtattr *) b;
404 RTA_PUT(skb,TCA_OPTIONS,0,NULL);
405 RTA_PUT(skb,TCA_DSMARK_MASK,1,&p->mask[cl-1]);
406 RTA_PUT(skb,TCA_DSMARK_VALUE,1,&p->value[cl-1]);
407 rta->rta_len = skb->tail-b;
411 skb_trim(skb,b-skb->data);
415 static int dsmark_dump(struct Qdisc *sch, struct sk_buff *skb)
417 struct dsmark_qdisc_data *p = PRIV(sch);
418 unsigned char *b = skb->tail;
421 rta = (struct rtattr *) b;
422 RTA_PUT(skb,TCA_OPTIONS,0,NULL);
423 RTA_PUT(skb,TCA_DSMARK_INDICES,sizeof(__u16),&p->indices);
424 if (p->default_index != NO_DEFAULT_INDEX) {
425 __u16 tmp = p->default_index;
427 RTA_PUT(skb,TCA_DSMARK_DEFAULT_INDEX, sizeof(__u16), &tmp);
430 RTA_PUT(skb, TCA_DSMARK_SET_TC_INDEX, 0, NULL);
431 rta->rta_len = skb->tail-b;
435 skb_trim(skb,b-skb->data);
439 static struct Qdisc_class_ops dsmark_class_ops = {
440 .graft = dsmark_graft,
444 .change = dsmark_change,
445 .delete = dsmark_delete,
447 .tcf_chain = dsmark_find_tcf,
448 .bind_tcf = dsmark_bind_filter,
449 .unbind_tcf = dsmark_put,
450 .dump = dsmark_dump_class,
453 static struct Qdisc_ops dsmark_qdisc_ops = {
455 .cl_ops = &dsmark_class_ops,
457 .priv_size = sizeof(struct dsmark_qdisc_data),
458 .enqueue = dsmark_enqueue,
459 .dequeue = dsmark_dequeue,
460 .requeue = dsmark_requeue,
463 .reset = dsmark_reset,
464 .destroy = dsmark_destroy,
467 .owner = THIS_MODULE,
470 static int __init dsmark_module_init(void)
472 return register_qdisc(&dsmark_qdisc_ops);
474 static void __exit dsmark_module_exit(void)
476 unregister_qdisc(&dsmark_qdisc_ops);
478 module_init(dsmark_module_init)
479 module_exit(dsmark_module_exit)
480 MODULE_LICENSE("GPL");