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/slab.h>
9 #include <linux/types.h>
10 #include <linux/string.h>
11 #include <linux/errno.h>
12 #include <linux/skbuff.h>
13 #include <linux/rtnetlink.h>
14 #include <linux/bitops.h>
15 #include <net/pkt_sched.h>
16 #include <net/dsfield.h>
17 #include <net/inet_ecn.h>
18 #include <asm/byteorder.h>
21 * classid class marking
22 * ------- ----- -------
26 * x:y y>0 y+1 use entry [y]
28 * x:indices-1 indices use entry [indices-1]
30 * x:y y+1 use entry [y & (indices-1)]
32 * 0xffff 0x10000 use entry [indices-1]
36 #define NO_DEFAULT_INDEX (1 << 16)
38 struct dsmark_qdisc_data {
40 struct tcf_proto *filter_list;
41 u8 *mask; /* "owns" the array */
44 u32 default_index; /* index range is 0...0xffff */
48 static inline int dsmark_valid_index(struct dsmark_qdisc_data *p, u16 index)
50 return (index <= p->indices && index > 0);
53 /* ------------------------- Class/flow operations ------------------------- */
55 static int dsmark_graft(struct Qdisc *sch, unsigned long arg,
56 struct Qdisc *new, struct Qdisc **old)
58 struct dsmark_qdisc_data *p = qdisc_priv(sch);
60 pr_debug("dsmark_graft(sch %p,[qdisc %p],new %p,old %p)\n",
64 new = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue,
74 qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
81 static struct Qdisc *dsmark_leaf(struct Qdisc *sch, unsigned long arg)
83 struct dsmark_qdisc_data *p = qdisc_priv(sch);
87 static unsigned long dsmark_get(struct Qdisc *sch, u32 classid)
89 pr_debug("dsmark_get(sch %p,[qdisc %p],classid %x)\n",
90 sch, qdisc_priv(sch), classid);
92 return TC_H_MIN(classid) + 1;
95 static unsigned long dsmark_bind_filter(struct Qdisc *sch,
96 unsigned long parent, u32 classid)
98 return dsmark_get(sch, classid);
101 static void dsmark_put(struct Qdisc *sch, unsigned long cl)
105 static const struct nla_policy dsmark_policy[TCA_DSMARK_MAX + 1] = {
106 [TCA_DSMARK_INDICES] = { .type = NLA_U16 },
107 [TCA_DSMARK_DEFAULT_INDEX] = { .type = NLA_U16 },
108 [TCA_DSMARK_SET_TC_INDEX] = { .type = NLA_FLAG },
109 [TCA_DSMARK_MASK] = { .type = NLA_U8 },
110 [TCA_DSMARK_VALUE] = { .type = NLA_U8 },
113 static int dsmark_change(struct Qdisc *sch, u32 classid, u32 parent,
114 struct nlattr **tca, unsigned long *arg)
116 struct dsmark_qdisc_data *p = qdisc_priv(sch);
117 struct nlattr *opt = tca[TCA_OPTIONS];
118 struct nlattr *tb[TCA_DSMARK_MAX + 1];
122 pr_debug("dsmark_change(sch %p,[qdisc %p],classid %x,parent %x),"
123 "arg 0x%lx\n", sch, p, classid, parent, *arg);
125 if (!dsmark_valid_index(p, *arg)) {
133 err = nla_parse_nested(tb, TCA_DSMARK_MAX, opt, dsmark_policy);
137 if (tb[TCA_DSMARK_MASK])
138 mask = nla_get_u8(tb[TCA_DSMARK_MASK]);
140 if (tb[TCA_DSMARK_VALUE])
141 p->value[*arg-1] = nla_get_u8(tb[TCA_DSMARK_VALUE]);
143 if (tb[TCA_DSMARK_MASK])
144 p->mask[*arg-1] = mask;
152 static int dsmark_delete(struct Qdisc *sch, unsigned long arg)
154 struct dsmark_qdisc_data *p = qdisc_priv(sch);
156 if (!dsmark_valid_index(p, arg))
159 p->mask[arg-1] = 0xff;
165 static void dsmark_walk(struct Qdisc *sch, struct qdisc_walker *walker)
167 struct dsmark_qdisc_data *p = qdisc_priv(sch);
170 pr_debug("dsmark_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
175 for (i = 0; i < p->indices; i++) {
176 if (p->mask[i] == 0xff && !p->value[i])
178 if (walker->count >= walker->skip) {
179 if (walker->fn(sch, i+1, walker) < 0) {
189 static inline struct tcf_proto **dsmark_find_tcf(struct Qdisc *sch,
192 struct dsmark_qdisc_data *p = qdisc_priv(sch);
193 return &p->filter_list;
196 /* --------------------------- Qdisc operations ---------------------------- */
198 static int dsmark_enqueue(struct sk_buff *skb, struct Qdisc *sch)
200 struct dsmark_qdisc_data *p = qdisc_priv(sch);
203 pr_debug("dsmark_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
205 if (p->set_tc_index) {
206 switch (skb->protocol) {
207 case htons(ETH_P_IP):
208 if (skb_cow_head(skb, sizeof(struct iphdr)))
211 skb->tc_index = ipv4_get_dsfield(ip_hdr(skb))
215 case htons(ETH_P_IPV6):
216 if (skb_cow_head(skb, sizeof(struct ipv6hdr)))
219 skb->tc_index = ipv6_get_dsfield(ipv6_hdr(skb))
228 if (TC_H_MAJ(skb->priority) == sch->handle)
229 skb->tc_index = TC_H_MIN(skb->priority);
231 struct tcf_result res;
232 int result = tc_classify(skb, p->filter_list, &res);
234 pr_debug("result %d class 0x%04x\n", result, res.classid);
237 #ifdef CONFIG_NET_CLS_ACT
241 return NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
247 skb->tc_index = TC_H_MIN(res.classid);
251 if (p->default_index != NO_DEFAULT_INDEX)
252 skb->tc_index = p->default_index;
257 err = qdisc_enqueue(skb, p->q);
258 if (err != NET_XMIT_SUCCESS) {
259 if (net_xmit_drop_count(err))
264 sch->bstats.bytes += qdisc_pkt_len(skb);
265 sch->bstats.packets++;
268 return NET_XMIT_SUCCESS;
273 return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
276 static struct sk_buff *dsmark_dequeue(struct Qdisc *sch)
278 struct dsmark_qdisc_data *p = qdisc_priv(sch);
282 pr_debug("dsmark_dequeue(sch %p,[qdisc %p])\n", sch, p);
284 skb = p->q->ops->dequeue(p->q);
290 index = skb->tc_index & (p->indices - 1);
291 pr_debug("index %d->%d\n", skb->tc_index, index);
293 switch (skb->protocol) {
294 case htons(ETH_P_IP):
295 ipv4_change_dsfield(ip_hdr(skb), p->mask[index],
298 case htons(ETH_P_IPV6):
299 ipv6_change_dsfield(ipv6_hdr(skb), p->mask[index],
304 * Only complain if a change was actually attempted.
305 * This way, we can send non-IP traffic through dsmark
306 * and don't need yet another qdisc as a bypass.
308 if (p->mask[index] != 0xff || p->value[index])
310 "dsmark_dequeue: unsupported protocol %d\n",
311 ntohs(skb->protocol));
318 static struct sk_buff *dsmark_peek(struct Qdisc *sch)
320 struct dsmark_qdisc_data *p = qdisc_priv(sch);
322 pr_debug("dsmark_peek(sch %p,[qdisc %p])\n", sch, p);
324 return p->q->ops->peek(p->q);
327 static unsigned int dsmark_drop(struct Qdisc *sch)
329 struct dsmark_qdisc_data *p = qdisc_priv(sch);
332 pr_debug("dsmark_reset(sch %p,[qdisc %p])\n", sch, p);
334 if (p->q->ops->drop == NULL)
337 len = p->q->ops->drop(p->q);
344 static int dsmark_init(struct Qdisc *sch, struct nlattr *opt)
346 struct dsmark_qdisc_data *p = qdisc_priv(sch);
347 struct nlattr *tb[TCA_DSMARK_MAX + 1];
349 u32 default_index = NO_DEFAULT_INDEX;
353 pr_debug("dsmark_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
358 err = nla_parse_nested(tb, TCA_DSMARK_MAX, opt, dsmark_policy);
363 indices = nla_get_u16(tb[TCA_DSMARK_INDICES]);
365 if (hweight32(indices) != 1)
368 if (tb[TCA_DSMARK_DEFAULT_INDEX])
369 default_index = nla_get_u16(tb[TCA_DSMARK_DEFAULT_INDEX]);
371 mask = kmalloc(indices * 2, GFP_KERNEL);
378 memset(p->mask, 0xff, indices);
380 p->value = p->mask + indices;
381 memset(p->value, 0, indices);
383 p->indices = indices;
384 p->default_index = default_index;
385 p->set_tc_index = nla_get_flag(tb[TCA_DSMARK_SET_TC_INDEX]);
387 p->q = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue,
388 &pfifo_qdisc_ops, sch->handle);
392 pr_debug("dsmark_init: qdisc %p\n", p->q);
399 static void dsmark_reset(struct Qdisc *sch)
401 struct dsmark_qdisc_data *p = qdisc_priv(sch);
403 pr_debug("dsmark_reset(sch %p,[qdisc %p])\n", sch, p);
408 static void dsmark_destroy(struct Qdisc *sch)
410 struct dsmark_qdisc_data *p = qdisc_priv(sch);
412 pr_debug("dsmark_destroy(sch %p,[qdisc %p])\n", sch, p);
414 tcf_destroy_chain(&p->filter_list);
419 static int dsmark_dump_class(struct Qdisc *sch, unsigned long cl,
420 struct sk_buff *skb, struct tcmsg *tcm)
422 struct dsmark_qdisc_data *p = qdisc_priv(sch);
423 struct nlattr *opts = NULL;
425 pr_debug("dsmark_dump_class(sch %p,[qdisc %p],class %ld\n", sch, p, cl);
427 if (!dsmark_valid_index(p, cl))
430 tcm->tcm_handle = TC_H_MAKE(TC_H_MAJ(sch->handle), cl-1);
431 tcm->tcm_info = p->q->handle;
433 opts = nla_nest_start(skb, TCA_OPTIONS);
435 goto nla_put_failure;
436 NLA_PUT_U8(skb, TCA_DSMARK_MASK, p->mask[cl-1]);
437 NLA_PUT_U8(skb, TCA_DSMARK_VALUE, p->value[cl-1]);
439 return nla_nest_end(skb, opts);
442 nla_nest_cancel(skb, opts);
446 static int dsmark_dump(struct Qdisc *sch, struct sk_buff *skb)
448 struct dsmark_qdisc_data *p = qdisc_priv(sch);
449 struct nlattr *opts = NULL;
451 opts = nla_nest_start(skb, TCA_OPTIONS);
453 goto nla_put_failure;
454 NLA_PUT_U16(skb, TCA_DSMARK_INDICES, p->indices);
456 if (p->default_index != NO_DEFAULT_INDEX)
457 NLA_PUT_U16(skb, TCA_DSMARK_DEFAULT_INDEX, p->default_index);
460 NLA_PUT_FLAG(skb, TCA_DSMARK_SET_TC_INDEX);
462 return nla_nest_end(skb, opts);
465 nla_nest_cancel(skb, opts);
469 static const struct Qdisc_class_ops dsmark_class_ops = {
470 .graft = dsmark_graft,
474 .change = dsmark_change,
475 .delete = dsmark_delete,
477 .tcf_chain = dsmark_find_tcf,
478 .bind_tcf = dsmark_bind_filter,
479 .unbind_tcf = dsmark_put,
480 .dump = dsmark_dump_class,
483 static struct Qdisc_ops dsmark_qdisc_ops __read_mostly = {
485 .cl_ops = &dsmark_class_ops,
487 .priv_size = sizeof(struct dsmark_qdisc_data),
488 .enqueue = dsmark_enqueue,
489 .dequeue = dsmark_dequeue,
493 .reset = dsmark_reset,
494 .destroy = dsmark_destroy,
497 .owner = THIS_MODULE,
500 static int __init dsmark_module_init(void)
502 return register_qdisc(&dsmark_qdisc_ops);
505 static void __exit dsmark_module_exit(void)
507 unregister_qdisc(&dsmark_qdisc_ops);
510 module_init(dsmark_module_init)
511 module_exit(dsmark_module_exit)
513 MODULE_LICENSE("GPL");