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 <linux/bitops.h>
14 #include <net/pkt_sched.h>
15 #include <net/dsfield.h>
16 #include <net/inet_ecn.h>
17 #include <asm/byteorder.h>
20 * classid class marking
21 * ------- ----- -------
25 * x:y y>0 y+1 use entry [y]
27 * x:indices-1 indices use entry [indices-1]
29 * x:y y+1 use entry [y & (indices-1)]
31 * 0xffff 0x10000 use entry [indices-1]
35 #define NO_DEFAULT_INDEX (1 << 16)
37 struct dsmark_qdisc_data {
39 struct tcf_proto *filter_list;
40 u8 *mask; /* "owns" the array */
43 u32 default_index; /* index range is 0...0xffff */
47 static inline int dsmark_valid_index(struct dsmark_qdisc_data *p, u16 index)
49 return (index <= p->indices && index > 0);
52 /* ------------------------- Class/flow operations ------------------------- */
54 static int dsmark_graft(struct Qdisc *sch, unsigned long arg,
55 struct Qdisc *new, struct Qdisc **old)
57 struct dsmark_qdisc_data *p = qdisc_priv(sch);
59 pr_debug("dsmark_graft(sch %p,[qdisc %p],new %p,old %p)\n",
63 new = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops,
70 *old = xchg(&p->q, new);
71 qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
78 static struct Qdisc *dsmark_leaf(struct Qdisc *sch, unsigned long arg)
80 struct dsmark_qdisc_data *p = qdisc_priv(sch);
84 static unsigned long dsmark_get(struct Qdisc *sch, u32 classid)
86 pr_debug("dsmark_get(sch %p,[qdisc %p],classid %x)\n",
87 sch, qdisc_priv(sch), classid);
89 return TC_H_MIN(classid) + 1;
92 static unsigned long dsmark_bind_filter(struct Qdisc *sch,
93 unsigned long parent, u32 classid)
95 return dsmark_get(sch, classid);
98 static void dsmark_put(struct Qdisc *sch, unsigned long cl)
102 static int dsmark_change(struct Qdisc *sch, u32 classid, u32 parent,
103 struct nlattr **tca, unsigned long *arg)
105 struct dsmark_qdisc_data *p = qdisc_priv(sch);
106 struct nlattr *opt = tca[TCA_OPTIONS];
107 struct nlattr *tb[TCA_DSMARK_MAX + 1];
111 pr_debug("dsmark_change(sch %p,[qdisc %p],classid %x,parent %x),"
112 "arg 0x%lx\n", sch, p, classid, parent, *arg);
114 if (!dsmark_valid_index(p, *arg)) {
119 if (!opt || nla_parse_nested(tb, TCA_DSMARK_MAX, opt, NULL))
122 if (tb[TCA_DSMARK_MASK]) {
123 if (nla_len(tb[TCA_DSMARK_MASK]) < sizeof(u8))
125 mask = nla_get_u8(tb[TCA_DSMARK_MASK]);
127 if (tb[TCA_DSMARK_VALUE]) {
128 if (nla_len(tb[TCA_DSMARK_VALUE]) < sizeof(u8))
130 p->value[*arg-1] = nla_get_u8(tb[TCA_DSMARK_VALUE]);
133 if (tb[TCA_DSMARK_MASK])
134 p->mask[*arg-1] = mask;
142 static int dsmark_delete(struct Qdisc *sch, unsigned long arg)
144 struct dsmark_qdisc_data *p = qdisc_priv(sch);
146 if (!dsmark_valid_index(p, arg))
149 p->mask[arg-1] = 0xff;
155 static void dsmark_walk(struct Qdisc *sch, struct qdisc_walker *walker)
157 struct dsmark_qdisc_data *p = qdisc_priv(sch);
160 pr_debug("dsmark_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
165 for (i = 0; i < p->indices; i++) {
166 if (p->mask[i] == 0xff && !p->value[i])
168 if (walker->count >= walker->skip) {
169 if (walker->fn(sch, i+1, walker) < 0) {
179 static inline struct tcf_proto **dsmark_find_tcf(struct Qdisc *sch,
182 struct dsmark_qdisc_data *p = qdisc_priv(sch);
183 return &p->filter_list;
186 /* --------------------------- Qdisc operations ---------------------------- */
188 static int dsmark_enqueue(struct sk_buff *skb, struct Qdisc *sch)
190 struct dsmark_qdisc_data *p = qdisc_priv(sch);
193 pr_debug("dsmark_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
195 if (p->set_tc_index) {
196 switch (skb->protocol) {
197 case __constant_htons(ETH_P_IP):
198 if (skb_cow_head(skb, sizeof(struct iphdr)))
201 skb->tc_index = ipv4_get_dsfield(ip_hdr(skb))
205 case __constant_htons(ETH_P_IPV6):
206 if (skb_cow_head(skb, sizeof(struct ipv6hdr)))
209 skb->tc_index = ipv6_get_dsfield(ipv6_hdr(skb))
218 if (TC_H_MAJ(skb->priority) == sch->handle)
219 skb->tc_index = TC_H_MIN(skb->priority);
221 struct tcf_result res;
222 int result = tc_classify(skb, p->filter_list, &res);
224 pr_debug("result %d class 0x%04x\n", result, res.classid);
227 #ifdef CONFIG_NET_CLS_ACT
231 return NET_XMIT_SUCCESS;
237 skb->tc_index = TC_H_MIN(res.classid);
241 if (p->default_index != NO_DEFAULT_INDEX)
242 skb->tc_index = p->default_index;
247 err = p->q->enqueue(skb, p->q);
248 if (err != NET_XMIT_SUCCESS) {
253 sch->bstats.bytes += skb->len;
254 sch->bstats.packets++;
257 return NET_XMIT_SUCCESS;
262 return NET_XMIT_BYPASS;
265 static struct sk_buff *dsmark_dequeue(struct Qdisc *sch)
267 struct dsmark_qdisc_data *p = qdisc_priv(sch);
271 pr_debug("dsmark_dequeue(sch %p,[qdisc %p])\n", sch, p);
273 skb = p->q->ops->dequeue(p->q);
279 index = skb->tc_index & (p->indices - 1);
280 pr_debug("index %d->%d\n", skb->tc_index, index);
282 switch (skb->protocol) {
283 case __constant_htons(ETH_P_IP):
284 ipv4_change_dsfield(ip_hdr(skb), p->mask[index],
287 case __constant_htons(ETH_P_IPV6):
288 ipv6_change_dsfield(ipv6_hdr(skb), p->mask[index],
293 * Only complain if a change was actually attempted.
294 * This way, we can send non-IP traffic through dsmark
295 * and don't need yet another qdisc as a bypass.
297 if (p->mask[index] != 0xff || p->value[index])
299 "dsmark_dequeue: unsupported protocol %d\n",
300 ntohs(skb->protocol));
307 static int dsmark_requeue(struct sk_buff *skb, struct Qdisc *sch)
309 struct dsmark_qdisc_data *p = qdisc_priv(sch);
312 pr_debug("dsmark_requeue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
314 err = p->q->ops->requeue(skb, p->q);
315 if (err != NET_XMIT_SUCCESS) {
321 sch->qstats.requeues++;
323 return NET_XMIT_SUCCESS;
326 static unsigned int dsmark_drop(struct Qdisc *sch)
328 struct dsmark_qdisc_data *p = qdisc_priv(sch);
331 pr_debug("dsmark_reset(sch %p,[qdisc %p])\n", sch, p);
333 if (p->q->ops->drop == NULL)
336 len = p->q->ops->drop(p->q);
343 static int dsmark_init(struct Qdisc *sch, struct nlattr *opt)
345 struct dsmark_qdisc_data *p = qdisc_priv(sch);
346 struct nlattr *tb[TCA_DSMARK_MAX + 1];
348 u32 default_index = NO_DEFAULT_INDEX;
352 pr_debug("dsmark_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
354 if (!opt || nla_parse_nested(tb, TCA_DSMARK_MAX, opt, NULL) < 0)
357 if (nla_len(tb[TCA_DSMARK_INDICES]) < sizeof(u16))
359 indices = nla_get_u16(tb[TCA_DSMARK_INDICES]);
361 if (hweight32(indices) != 1)
364 if (tb[TCA_DSMARK_DEFAULT_INDEX]) {
365 if (nla_len(tb[TCA_DSMARK_DEFAULT_INDEX]) < sizeof(u16))
367 default_index = nla_get_u16(tb[TCA_DSMARK_DEFAULT_INDEX]);
370 mask = kmalloc(indices * 2, GFP_KERNEL);
377 memset(p->mask, 0xff, indices);
379 p->value = p->mask + indices;
380 memset(p->value, 0, indices);
382 p->indices = indices;
383 p->default_index = default_index;
384 p->set_tc_index = nla_get_flag(tb[TCA_DSMARK_SET_TC_INDEX]);
386 p->q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, sch->handle);
390 pr_debug("dsmark_init: qdisc %p\n", p->q);
397 static void dsmark_reset(struct Qdisc *sch)
399 struct dsmark_qdisc_data *p = qdisc_priv(sch);
401 pr_debug("dsmark_reset(sch %p,[qdisc %p])\n", sch, p);
406 static void dsmark_destroy(struct Qdisc *sch)
408 struct dsmark_qdisc_data *p = qdisc_priv(sch);
410 pr_debug("dsmark_destroy(sch %p,[qdisc %p])\n", sch, p);
412 tcf_destroy_chain(p->filter_list);
417 static int dsmark_dump_class(struct Qdisc *sch, unsigned long cl,
418 struct sk_buff *skb, struct tcmsg *tcm)
420 struct dsmark_qdisc_data *p = qdisc_priv(sch);
421 struct nlattr *opts = NULL;
423 pr_debug("dsmark_dump_class(sch %p,[qdisc %p],class %ld\n", sch, p, cl);
425 if (!dsmark_valid_index(p, cl))
428 tcm->tcm_handle = TC_H_MAKE(TC_H_MAJ(sch->handle), cl-1);
429 tcm->tcm_info = p->q->handle;
431 opts = nla_nest_start(skb, TCA_OPTIONS);
433 goto nla_put_failure;
434 NLA_PUT_U8(skb, TCA_DSMARK_MASK, p->mask[cl-1]);
435 NLA_PUT_U8(skb, TCA_DSMARK_VALUE, p->value[cl-1]);
437 return nla_nest_end(skb, opts);
440 return nla_nest_cancel(skb, opts);
443 static int dsmark_dump(struct Qdisc *sch, struct sk_buff *skb)
445 struct dsmark_qdisc_data *p = qdisc_priv(sch);
446 struct nlattr *opts = NULL;
448 opts = nla_nest_start(skb, TCA_OPTIONS);
450 goto nla_put_failure;
451 NLA_PUT_U16(skb, TCA_DSMARK_INDICES, p->indices);
453 if (p->default_index != NO_DEFAULT_INDEX)
454 NLA_PUT_U16(skb, TCA_DSMARK_DEFAULT_INDEX, p->default_index);
457 NLA_PUT_FLAG(skb, TCA_DSMARK_SET_TC_INDEX);
459 return nla_nest_end(skb, opts);
462 return nla_nest_cancel(skb, opts);
465 static const struct Qdisc_class_ops dsmark_class_ops = {
466 .graft = dsmark_graft,
470 .change = dsmark_change,
471 .delete = dsmark_delete,
473 .tcf_chain = dsmark_find_tcf,
474 .bind_tcf = dsmark_bind_filter,
475 .unbind_tcf = dsmark_put,
476 .dump = dsmark_dump_class,
479 static struct Qdisc_ops dsmark_qdisc_ops __read_mostly = {
481 .cl_ops = &dsmark_class_ops,
483 .priv_size = sizeof(struct dsmark_qdisc_data),
484 .enqueue = dsmark_enqueue,
485 .dequeue = dsmark_dequeue,
486 .requeue = dsmark_requeue,
489 .reset = dsmark_reset,
490 .destroy = dsmark_destroy,
493 .owner = THIS_MODULE,
496 static int __init dsmark_module_init(void)
498 return register_qdisc(&dsmark_qdisc_ops);
501 static void __exit dsmark_module_exit(void)
503 unregister_qdisc(&dsmark_qdisc_ops);
506 module_init(dsmark_module_init)
507 module_exit(dsmark_module_exit)
509 MODULE_LICENSE("GPL");