blob: b9fe6975fbec6585d36c0a015310267d12198085 [file] [log] [blame]
/* net/sched/sch_dsmark.c - Differentiated Services field marker */
/* Written 1998-2000 by Werner Almesberger, EPFL ICA */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <net/pkt_sched.h>
#include <net/dsfield.h>
#include <net/inet_ecn.h>
#include <asm/byteorder.h>
#if 0 /* control */
#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
#else
#define DPRINTK(format,args...)
#endif
#if 0 /* data */
#define D2PRINTK(format,args...) printk(KERN_DEBUG format,##args)
#else
#define D2PRINTK(format,args...)
#endif
#define PRIV(sch) ((struct dsmark_qdisc_data *) qdisc_priv(sch))
/*
* classid class marking
* ------- ----- -------
* n/a 0 n/a
* x:0 1 use entry [0]
* ... ... ...
* x:y y>0 y+1 use entry [y]
* ... ... ...
* x:indices-1 indices use entry [indices-1]
* ... ... ...
* x:y y+1 use entry [y & (indices-1)]
* ... ... ...
* 0xffff 0x10000 use entry [indices-1]
*/
#define NO_DEFAULT_INDEX (1 << 16)
struct dsmark_qdisc_data {
struct Qdisc *q;
struct tcf_proto *filter_list;
u8 *mask; /* "owns" the array */
u8 *value;
u16 indices;
u32 default_index; /* index range is 0...0xffff */
int set_tc_index;
};
static inline int dsmark_valid_indices(u16 indices)
{
while (indices != 1) {
if (indices & 1)
return 0;
indices >>= 1;
}
return 1;
}
static inline int dsmark_valid_index(struct dsmark_qdisc_data *p, u16 index)
{
return (index <= p->indices && index > 0);
}
/* ------------------------- Class/flow operations ------------------------- */
static int dsmark_graft(struct Qdisc *sch, unsigned long arg,
struct Qdisc *new, struct Qdisc **old)
{
struct dsmark_qdisc_data *p = PRIV(sch);
DPRINTK("dsmark_graft(sch %p,[qdisc %p],new %p,old %p)\n",
sch, p, new, old);
if (new == NULL) {
new = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops,
sch->handle);
if (new == NULL)
new = &noop_qdisc;
}
sch_tree_lock(sch);
*old = xchg(&p->q, new);
qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
qdisc_reset(*old);
sch_tree_unlock(sch);
return 0;
}
static struct Qdisc *dsmark_leaf(struct Qdisc *sch, unsigned long arg)
{
return PRIV(sch)->q;
}
static unsigned long dsmark_get(struct Qdisc *sch, u32 classid)
{
DPRINTK("dsmark_get(sch %p,[qdisc %p],classid %x)\n",
sch, PRIV(sch), classid);
return TC_H_MIN(classid) + 1;
}
static unsigned long dsmark_bind_filter(struct Qdisc *sch,
unsigned long parent, u32 classid)
{
return dsmark_get(sch, classid);
}
static void dsmark_put(struct Qdisc *sch, unsigned long cl)
{
}
static int dsmark_change(struct Qdisc *sch, u32 classid, u32 parent,
struct rtattr **tca, unsigned long *arg)
{
struct dsmark_qdisc_data *p = PRIV(sch);
struct rtattr *opt = tca[TCA_OPTIONS-1];
struct rtattr *tb[TCA_DSMARK_MAX];
int err = -EINVAL;
u8 mask = 0;
DPRINTK("dsmark_change(sch %p,[qdisc %p],classid %x,parent %x),"
"arg 0x%lx\n", sch, p, classid, parent, *arg);
if (!dsmark_valid_index(p, *arg)) {
err = -ENOENT;
goto rtattr_failure;
}
if (!opt || rtattr_parse_nested(tb, TCA_DSMARK_MAX, opt))
goto rtattr_failure;
if (tb[TCA_DSMARK_MASK-1])
mask = RTA_GET_U8(tb[TCA_DSMARK_MASK-1]);
if (tb[TCA_DSMARK_VALUE-1])
p->value[*arg-1] = RTA_GET_U8(tb[TCA_DSMARK_VALUE-1]);
if (tb[TCA_DSMARK_MASK-1])
p->mask[*arg-1] = mask;
err = 0;
rtattr_failure:
return err;
}
static int dsmark_delete(struct Qdisc *sch, unsigned long arg)
{
struct dsmark_qdisc_data *p = PRIV(sch);
if (!dsmark_valid_index(p, arg))
return -EINVAL;
p->mask[arg-1] = 0xff;
p->value[arg-1] = 0;
return 0;
}
static void dsmark_walk(struct Qdisc *sch,struct qdisc_walker *walker)
{
struct dsmark_qdisc_data *p = PRIV(sch);
int i;
DPRINTK("dsmark_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
if (walker->stop)
return;
for (i = 0; i < p->indices; i++) {
if (p->mask[i] == 0xff && !p->value[i])
goto ignore;
if (walker->count >= walker->skip) {
if (walker->fn(sch, i+1, walker) < 0) {
walker->stop = 1;
break;
}
}
ignore:
walker->count++;
}
}
static struct tcf_proto **dsmark_find_tcf(struct Qdisc *sch,unsigned long cl)
{
return &PRIV(sch)->filter_list;
}
/* --------------------------- Qdisc operations ---------------------------- */
static int dsmark_enqueue(struct sk_buff *skb,struct Qdisc *sch)
{
struct dsmark_qdisc_data *p = PRIV(sch);
int err;
D2PRINTK("dsmark_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
if (p->set_tc_index) {
/* FIXME: Safe with non-linear skbs? --RR */
switch (skb->protocol) {
case __constant_htons(ETH_P_IP):
skb->tc_index = ipv4_get_dsfield(ip_hdr(skb))
& ~INET_ECN_MASK;
break;
case __constant_htons(ETH_P_IPV6):
skb->tc_index = ipv6_get_dsfield(ipv6_hdr(skb))
& ~INET_ECN_MASK;
break;
default:
skb->tc_index = 0;
break;
}
}
if (TC_H_MAJ(skb->priority) == sch->handle)
skb->tc_index = TC_H_MIN(skb->priority);
else {
struct tcf_result res;
int result = tc_classify(skb, p->filter_list, &res);
D2PRINTK("result %d class 0x%04x\n", result, res.classid);
switch (result) {
#ifdef CONFIG_NET_CLS_ACT
case TC_ACT_QUEUED:
case TC_ACT_STOLEN:
kfree_skb(skb);
return NET_XMIT_SUCCESS;
case TC_ACT_SHOT:
kfree_skb(skb);
sch->qstats.drops++;
return NET_XMIT_BYPASS;
#endif
case TC_ACT_OK:
skb->tc_index = TC_H_MIN(res.classid);
break;
default:
if (p->default_index != NO_DEFAULT_INDEX)
skb->tc_index = p->default_index;
break;
}
}
err = p->q->enqueue(skb,p->q);
if (err != NET_XMIT_SUCCESS) {
sch->qstats.drops++;
return err;
}
sch->bstats.bytes += skb->len;
sch->bstats.packets++;
sch->q.qlen++;
return NET_XMIT_SUCCESS;
}
static struct sk_buff *dsmark_dequeue(struct Qdisc *sch)
{
struct dsmark_qdisc_data *p = PRIV(sch);
struct sk_buff *skb;
u32 index;
D2PRINTK("dsmark_dequeue(sch %p,[qdisc %p])\n", sch, p);
skb = p->q->ops->dequeue(p->q);
if (skb == NULL)
return NULL;
sch->q.qlen--;
index = skb->tc_index & (p->indices - 1);
D2PRINTK("index %d->%d\n", skb->tc_index, index);
switch (skb->protocol) {
case __constant_htons(ETH_P_IP):
ipv4_change_dsfield(ip_hdr(skb), p->mask[index],
p->value[index]);
break;
case __constant_htons(ETH_P_IPV6):
ipv6_change_dsfield(ipv6_hdr(skb), p->mask[index],
p->value[index]);
break;
default:
/*
* Only complain if a change was actually attempted.
* This way, we can send non-IP traffic through dsmark
* and don't need yet another qdisc as a bypass.
*/
if (p->mask[index] != 0xff || p->value[index])
printk(KERN_WARNING "dsmark_dequeue: "
"unsupported protocol %d\n",
ntohs(skb->protocol));
break;
}
return skb;
}
static int dsmark_requeue(struct sk_buff *skb,struct Qdisc *sch)
{
struct dsmark_qdisc_data *p = PRIV(sch);
int err;
D2PRINTK("dsmark_requeue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
err = p->q->ops->requeue(skb, p->q);
if (err != NET_XMIT_SUCCESS) {
sch->qstats.drops++;
return err;
}
sch->q.qlen++;
sch->qstats.requeues++;
return NET_XMIT_SUCCESS;
}
static unsigned int dsmark_drop(struct Qdisc *sch)
{
struct dsmark_qdisc_data *p = PRIV(sch);
unsigned int len;
DPRINTK("dsmark_reset(sch %p,[qdisc %p])\n", sch, p);
if (p->q->ops->drop == NULL)
return 0;
len = p->q->ops->drop(p->q);
if (len)
sch->q.qlen--;
return len;
}
static int dsmark_init(struct Qdisc *sch, struct rtattr *opt)
{
struct dsmark_qdisc_data *p = PRIV(sch);
struct rtattr *tb[TCA_DSMARK_MAX];
int err = -EINVAL;
u32 default_index = NO_DEFAULT_INDEX;
u16 indices;
u8 *mask;
DPRINTK("dsmark_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
if (!opt || rtattr_parse_nested(tb, TCA_DSMARK_MAX, opt) < 0)
goto errout;
indices = RTA_GET_U16(tb[TCA_DSMARK_INDICES-1]);
if (!indices || !dsmark_valid_indices(indices))
goto errout;
if (tb[TCA_DSMARK_DEFAULT_INDEX-1])
default_index = RTA_GET_U16(tb[TCA_DSMARK_DEFAULT_INDEX-1]);
mask = kmalloc(indices * 2, GFP_KERNEL);
if (mask == NULL) {
err = -ENOMEM;
goto errout;
}
p->mask = mask;
memset(p->mask, 0xff, indices);
p->value = p->mask + indices;
memset(p->value, 0, indices);
p->indices = indices;
p->default_index = default_index;
p->set_tc_index = RTA_GET_FLAG(tb[TCA_DSMARK_SET_TC_INDEX-1]);
p->q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, sch->handle);
if (p->q == NULL)
p->q = &noop_qdisc;
DPRINTK("dsmark_init: qdisc %p\n", p->q);
err = 0;
errout:
rtattr_failure:
return err;
}
static void dsmark_reset(struct Qdisc *sch)
{
struct dsmark_qdisc_data *p = PRIV(sch);
DPRINTK("dsmark_reset(sch %p,[qdisc %p])\n", sch, p);
qdisc_reset(p->q);
sch->q.qlen = 0;
}
static void dsmark_destroy(struct Qdisc *sch)
{
struct dsmark_qdisc_data *p = PRIV(sch);
DPRINTK("dsmark_destroy(sch %p,[qdisc %p])\n", sch, p);
tcf_destroy_chain(p->filter_list);
qdisc_destroy(p->q);
kfree(p->mask);
}
static int dsmark_dump_class(struct Qdisc *sch, unsigned long cl,
struct sk_buff *skb, struct tcmsg *tcm)
{
struct dsmark_qdisc_data *p = PRIV(sch);
struct rtattr *opts = NULL;
DPRINTK("dsmark_dump_class(sch %p,[qdisc %p],class %ld\n", sch, p, cl);
if (!dsmark_valid_index(p, cl))
return -EINVAL;
tcm->tcm_handle = TC_H_MAKE(TC_H_MAJ(sch->handle), cl-1);
tcm->tcm_info = p->q->handle;
opts = RTA_NEST(skb, TCA_OPTIONS);
RTA_PUT_U8(skb,TCA_DSMARK_MASK, p->mask[cl-1]);
RTA_PUT_U8(skb,TCA_DSMARK_VALUE, p->value[cl-1]);
return RTA_NEST_END(skb, opts);
rtattr_failure:
return RTA_NEST_CANCEL(skb, opts);
}
static int dsmark_dump(struct Qdisc *sch, struct sk_buff *skb)
{
struct dsmark_qdisc_data *p = PRIV(sch);
struct rtattr *opts = NULL;
opts = RTA_NEST(skb, TCA_OPTIONS);
RTA_PUT_U16(skb, TCA_DSMARK_INDICES, p->indices);
if (p->default_index != NO_DEFAULT_INDEX)
RTA_PUT_U16(skb, TCA_DSMARK_DEFAULT_INDEX, p->default_index);
if (p->set_tc_index)
RTA_PUT_FLAG(skb, TCA_DSMARK_SET_TC_INDEX);
return RTA_NEST_END(skb, opts);
rtattr_failure:
return RTA_NEST_CANCEL(skb, opts);
}
static const struct Qdisc_class_ops dsmark_class_ops = {
.graft = dsmark_graft,
.leaf = dsmark_leaf,
.get = dsmark_get,
.put = dsmark_put,
.change = dsmark_change,
.delete = dsmark_delete,
.walk = dsmark_walk,
.tcf_chain = dsmark_find_tcf,
.bind_tcf = dsmark_bind_filter,
.unbind_tcf = dsmark_put,
.dump = dsmark_dump_class,
};
static struct Qdisc_ops dsmark_qdisc_ops __read_mostly = {
.next = NULL,
.cl_ops = &dsmark_class_ops,
.id = "dsmark",
.priv_size = sizeof(struct dsmark_qdisc_data),
.enqueue = dsmark_enqueue,
.dequeue = dsmark_dequeue,
.requeue = dsmark_requeue,
.drop = dsmark_drop,
.init = dsmark_init,
.reset = dsmark_reset,
.destroy = dsmark_destroy,
.change = NULL,
.dump = dsmark_dump,
.owner = THIS_MODULE,
};
static int __init dsmark_module_init(void)
{
return register_qdisc(&dsmark_qdisc_ops);
}
static void __exit dsmark_module_exit(void)
{
unregister_qdisc(&dsmark_qdisc_ops);
}
module_init(dsmark_module_init)
module_exit(dsmark_module_exit)
MODULE_LICENSE("GPL");