1 /* net/sched/sch_dsmark.c - Differentiated Services field marker */
3 /* Written 1998-2000 by Werner Almesberger, EPFL ICA */
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/rtnetlink.h>
13 #include <net/pkt_sched.h>
14 #include <net/dsfield.h>
15 #include <net/inet_ecn.h>
16 #include <asm/byteorder.h>
20 #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
22 #define DPRINTK(format,args...)
26 #define D2PRINTK(format,args...) printk(KERN_DEBUG format,##args)
28 #define D2PRINTK(format,args...)
32 #define PRIV(sch) ((struct dsmark_qdisc_data *) qdisc_priv(sch))
36 * classid class marking
37 * ------- ----- -------
41 * x:y y>0 y+1 use entry [y]
43 * x:indices-1 indices use entry [indices-1]
45 * x:y y+1 use entry [y & (indices-1)]
47 * 0xffff 0x10000 use entry [indices-1]
51 #define NO_DEFAULT_INDEX (1 << 16)
53 struct dsmark_qdisc_data {
55 struct tcf_proto *filter_list;
56 u8 *mask; /* "owns" the array */
59 u32 default_index; /* index range is 0...0xffff */
63 static inline int dsmark_valid_indices(u16 indices)
65 while (indices != 1) {
74 static inline int dsmark_valid_index(struct dsmark_qdisc_data *p, u16 index)
76 return (index <= p->indices && index > 0);
79 /* ------------------------- Class/flow operations ------------------------- */
81 static int dsmark_graft(struct Qdisc *sch, unsigned long arg,
82 struct Qdisc *new, struct Qdisc **old)
84 struct dsmark_qdisc_data *p = PRIV(sch);
86 DPRINTK("dsmark_graft(sch %p,[qdisc %p],new %p,old %p)\n",
90 new = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops,
97 *old = xchg(&p->q, new);
98 qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
100 sch_tree_unlock(sch);
105 static struct Qdisc *dsmark_leaf(struct Qdisc *sch, unsigned long arg)
110 static unsigned long dsmark_get(struct Qdisc *sch, u32 classid)
112 DPRINTK("dsmark_get(sch %p,[qdisc %p],classid %x)\n",
113 sch, PRIV(sch), classid);
115 return TC_H_MIN(classid) + 1;
118 static unsigned long dsmark_bind_filter(struct Qdisc *sch,
119 unsigned long parent, u32 classid)
121 return dsmark_get(sch, classid);
124 static void dsmark_put(struct Qdisc *sch, unsigned long cl)
128 static int dsmark_change(struct Qdisc *sch, u32 classid, u32 parent,
129 struct rtattr **tca, unsigned long *arg)
131 struct dsmark_qdisc_data *p = PRIV(sch);
132 struct rtattr *opt = tca[TCA_OPTIONS-1];
133 struct rtattr *tb[TCA_DSMARK_MAX];
137 DPRINTK("dsmark_change(sch %p,[qdisc %p],classid %x,parent %x),"
138 "arg 0x%lx\n", sch, p, classid, parent, *arg);
140 if (!dsmark_valid_index(p, *arg)) {
145 if (!opt || rtattr_parse_nested(tb, TCA_DSMARK_MAX, opt))
148 if (tb[TCA_DSMARK_MASK-1])
149 mask = RTA_GET_U8(tb[TCA_DSMARK_MASK-1]);
151 if (tb[TCA_DSMARK_VALUE-1])
152 p->value[*arg-1] = RTA_GET_U8(tb[TCA_DSMARK_VALUE-1]);
154 if (tb[TCA_DSMARK_MASK-1])
155 p->mask[*arg-1] = mask;
163 static int dsmark_delete(struct Qdisc *sch, unsigned long arg)
165 struct dsmark_qdisc_data *p = PRIV(sch);
167 if (!dsmark_valid_index(p, arg))
170 p->mask[arg-1] = 0xff;
176 static void dsmark_walk(struct Qdisc *sch,struct qdisc_walker *walker)
178 struct dsmark_qdisc_data *p = PRIV(sch);
181 DPRINTK("dsmark_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
186 for (i = 0; i < p->indices; i++) {
187 if (p->mask[i] == 0xff && !p->value[i])
189 if (walker->count >= walker->skip) {
190 if (walker->fn(sch, i+1, walker) < 0) {
200 static struct tcf_proto **dsmark_find_tcf(struct Qdisc *sch,unsigned long cl)
202 return &PRIV(sch)->filter_list;
205 /* --------------------------- Qdisc operations ---------------------------- */
207 static int dsmark_enqueue(struct sk_buff *skb,struct Qdisc *sch)
209 struct dsmark_qdisc_data *p = PRIV(sch);
212 D2PRINTK("dsmark_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
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(ip_hdr(skb))
221 case __constant_htons(ETH_P_IPV6):
222 skb->tc_index = ipv6_get_dsfield(ipv6_hdr(skb))
231 if (TC_H_MAJ(skb->priority) == sch->handle)
232 skb->tc_index = TC_H_MIN(skb->priority);
234 struct tcf_result res;
235 int result = tc_classify(skb, p->filter_list, &res);
237 D2PRINTK("result %d class 0x%04x\n", result, res.classid);
240 #ifdef CONFIG_NET_CLS_ACT
244 return NET_XMIT_SUCCESS;
248 return NET_XMIT_BYPASS;
249 #elif defined(CONFIG_NET_CLS_POLICE)
253 return NET_XMIT_POLICED;
255 case TC_POLICE_RECLASSIFY:
256 /* FIXME: what to do here ??? */
260 skb->tc_index = TC_H_MIN(res.classid);
262 case TC_POLICE_UNSPEC:
265 if (p->default_index != NO_DEFAULT_INDEX)
266 skb->tc_index = p->default_index;
271 err = p->q->enqueue(skb,p->q);
272 if (err != NET_XMIT_SUCCESS) {
277 sch->bstats.bytes += skb->len;
278 sch->bstats.packets++;
281 return NET_XMIT_SUCCESS;
284 static struct sk_buff *dsmark_dequeue(struct Qdisc *sch)
286 struct dsmark_qdisc_data *p = PRIV(sch);
290 D2PRINTK("dsmark_dequeue(sch %p,[qdisc %p])\n", sch, p);
292 skb = p->q->ops->dequeue(p->q);
298 index = skb->tc_index & (p->indices - 1);
299 D2PRINTK("index %d->%d\n", skb->tc_index, index);
301 switch (skb->protocol) {
302 case __constant_htons(ETH_P_IP):
303 ipv4_change_dsfield(ip_hdr(skb), p->mask[index],
306 case __constant_htons(ETH_P_IPV6):
307 ipv6_change_dsfield(ipv6_hdr(skb), p->mask[index],
312 * Only complain if a change was actually attempted.
313 * This way, we can send non-IP traffic through dsmark
314 * and don't need yet another qdisc as a bypass.
316 if (p->mask[index] != 0xff || p->value[index])
317 printk(KERN_WARNING "dsmark_dequeue: "
318 "unsupported protocol %d\n",
319 ntohs(skb->protocol));
326 static int dsmark_requeue(struct sk_buff *skb,struct Qdisc *sch)
328 struct dsmark_qdisc_data *p = PRIV(sch);
331 D2PRINTK("dsmark_requeue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
333 err = p->q->ops->requeue(skb, p->q);
334 if (err != NET_XMIT_SUCCESS) {
340 sch->qstats.requeues++;
342 return NET_XMIT_SUCCESS;
345 static unsigned int dsmark_drop(struct Qdisc *sch)
347 struct dsmark_qdisc_data *p = PRIV(sch);
350 DPRINTK("dsmark_reset(sch %p,[qdisc %p])\n", sch, p);
352 if (p->q->ops->drop == NULL)
355 len = p->q->ops->drop(p->q);
362 static int dsmark_init(struct Qdisc *sch, struct rtattr *opt)
364 struct dsmark_qdisc_data *p = PRIV(sch);
365 struct rtattr *tb[TCA_DSMARK_MAX];
367 u32 default_index = NO_DEFAULT_INDEX;
371 DPRINTK("dsmark_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
373 if (!opt || rtattr_parse_nested(tb, TCA_DSMARK_MAX, opt) < 0)
376 indices = RTA_GET_U16(tb[TCA_DSMARK_INDICES-1]);
377 if (!indices || !dsmark_valid_indices(indices))
380 if (tb[TCA_DSMARK_DEFAULT_INDEX-1])
381 default_index = RTA_GET_U16(tb[TCA_DSMARK_DEFAULT_INDEX-1]);
383 mask = kmalloc(indices * 2, GFP_KERNEL);
390 memset(p->mask, 0xff, indices);
392 p->value = p->mask + indices;
393 memset(p->value, 0, indices);
395 p->indices = indices;
396 p->default_index = default_index;
397 p->set_tc_index = RTA_GET_FLAG(tb[TCA_DSMARK_SET_TC_INDEX-1]);
399 p->q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, sch->handle);
403 DPRINTK("dsmark_init: qdisc %p\n", p->q);
411 static void dsmark_reset(struct Qdisc *sch)
413 struct dsmark_qdisc_data *p = PRIV(sch);
415 DPRINTK("dsmark_reset(sch %p,[qdisc %p])\n", sch, p);
420 static void dsmark_destroy(struct Qdisc *sch)
422 struct dsmark_qdisc_data *p = PRIV(sch);
424 DPRINTK("dsmark_destroy(sch %p,[qdisc %p])\n", sch, p);
426 tcf_destroy_chain(p->filter_list);
431 static int dsmark_dump_class(struct Qdisc *sch, unsigned long cl,
432 struct sk_buff *skb, struct tcmsg *tcm)
434 struct dsmark_qdisc_data *p = PRIV(sch);
435 struct rtattr *opts = NULL;
437 DPRINTK("dsmark_dump_class(sch %p,[qdisc %p],class %ld\n", sch, p, cl);
439 if (!dsmark_valid_index(p, cl))
442 tcm->tcm_handle = TC_H_MAKE(TC_H_MAJ(sch->handle), cl-1);
443 tcm->tcm_info = p->q->handle;
445 opts = RTA_NEST(skb, TCA_OPTIONS);
446 RTA_PUT_U8(skb,TCA_DSMARK_MASK, p->mask[cl-1]);
447 RTA_PUT_U8(skb,TCA_DSMARK_VALUE, p->value[cl-1]);
449 return RTA_NEST_END(skb, opts);
452 return RTA_NEST_CANCEL(skb, opts);
455 static int dsmark_dump(struct Qdisc *sch, struct sk_buff *skb)
457 struct dsmark_qdisc_data *p = PRIV(sch);
458 struct rtattr *opts = NULL;
460 opts = RTA_NEST(skb, TCA_OPTIONS);
461 RTA_PUT_U16(skb, TCA_DSMARK_INDICES, p->indices);
463 if (p->default_index != NO_DEFAULT_INDEX)
464 RTA_PUT_U16(skb, TCA_DSMARK_DEFAULT_INDEX, p->default_index);
467 RTA_PUT_FLAG(skb, TCA_DSMARK_SET_TC_INDEX);
469 return RTA_NEST_END(skb, opts);
472 return RTA_NEST_CANCEL(skb, opts);
475 static struct Qdisc_class_ops dsmark_class_ops = {
476 .graft = dsmark_graft,
480 .change = dsmark_change,
481 .delete = dsmark_delete,
483 .tcf_chain = dsmark_find_tcf,
484 .bind_tcf = dsmark_bind_filter,
485 .unbind_tcf = dsmark_put,
486 .dump = dsmark_dump_class,
489 static struct Qdisc_ops dsmark_qdisc_ops = {
491 .cl_ops = &dsmark_class_ops,
493 .priv_size = sizeof(struct dsmark_qdisc_data),
494 .enqueue = dsmark_enqueue,
495 .dequeue = dsmark_dequeue,
496 .requeue = dsmark_requeue,
499 .reset = dsmark_reset,
500 .destroy = dsmark_destroy,
503 .owner = THIS_MODULE,
506 static int __init dsmark_module_init(void)
508 return register_qdisc(&dsmark_qdisc_ops);
511 static void __exit dsmark_module_exit(void)
513 unregister_qdisc(&dsmark_qdisc_ops);
516 module_init(dsmark_module_init)
517 module_exit(dsmark_module_exit)
519 MODULE_LICENSE("GPL");