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/* net/sched/sch_dsmark.c - Differentiated Services field marker */
/* Written 1998-2000 by Werner Almesberger, EPFL ICA */
#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h> /* for pkt_sched */
#include <linux/rtnetlink.h>
#include <net/pkt_sched.h>
#include <net/dsfield.h>
#include <asm/byteorder.h>
#if 1 /* 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 *) (sch)->data)
/*
* 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;
};
/* ------------------------- 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)
new = &noop_qdisc;
sch_tree_lock(sch);
*old = xchg(&p->q,new);
if (*old)
qdisc_reset(*old);
sch_tree_unlock(sch); /* @@@ move up ? */
return 0;
}
static struct Qdisc *dsmark_leaf(struct Qdisc *sch, unsigned long arg)
{
struct dsmark_qdisc_data *p = PRIV(sch);
return p->q;
}
static unsigned long dsmark_get(struct Qdisc *sch,u32 classid)
{
struct dsmark_qdisc_data *p __attribute__((unused)) = PRIV(sch);
DPRINTK("dsmark_get(sch %p,[qdisc %p],classid %x)\n",sch,p,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];
DPRINTK("dsmark_change(sch %p,[qdisc %p],classid %x,parent %x),"
"arg 0x%lx\n",sch,p,classid,parent,*arg);
if (*arg > p->indices)
return -ENOENT;
if (!opt || rtattr_parse(tb, TCA_DSMARK_MAX, RTA_DATA(opt),
RTA_PAYLOAD(opt)))
return -EINVAL;
if (tb[TCA_DSMARK_MASK-1]) {
if (!RTA_PAYLOAD(tb[TCA_DSMARK_MASK-1]))
return -EINVAL;
p->mask[*arg-1] = *(__u8 *) RTA_DATA(tb[TCA_DSMARK_MASK-1]);
}
if (tb[TCA_DSMARK_VALUE-1]) {
if (!RTA_PAYLOAD(tb[TCA_DSMARK_VALUE-1]))
return -EINVAL;
p->value[*arg-1] = *(__u8 *) RTA_DATA(tb[TCA_DSMARK_VALUE-1]);
}
return 0;
}
static int dsmark_delete(struct Qdisc *sch,unsigned long arg)
{
struct dsmark_qdisc_data *p = PRIV(sch);
if (!arg || arg > p->indices)
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])
continue;
if (walker->count >= walker->skip) {
if (walker->fn(sch, i+1, walker) < 0) {
walker->stop = 1;
break;
}
}
walker->count++;
}
}
static struct tcf_proto **dsmark_find_tcf(struct Qdisc *sch,unsigned long cl)
{
struct dsmark_qdisc_data *p = PRIV(sch);
return &p->filter_list;
}
/* --------------------------- Qdisc operations ---------------------------- */
static int dsmark_enqueue(struct sk_buff *skb,struct Qdisc *sch)
{
struct dsmark_qdisc_data *p = PRIV(sch);
struct tcf_result res;
int result;
int ret = NET_XMIT_POLICED;
D2PRINTK("dsmark_enqueue(skb %p,sch %p,[qdisc %p])\n",skb,sch,p);
if (p->set_tc_index) {
switch (skb->protocol) {
case __constant_htons(ETH_P_IP):
skb->tc_index = ipv4_get_dsfield(skb->nh.iph);
break;
case __constant_htons(ETH_P_IPV6):
skb->tc_index = ipv6_get_dsfield(skb->nh.ipv6h);
break;
default:
skb->tc_index = 0;
break;
};
}
result = TC_POLICE_OK; /* be nice to gcc */
if (TC_H_MAJ(skb->priority) == sch->handle) {
skb->tc_index = TC_H_MIN(skb->priority);
} else {
result = tc_classify(skb,p->filter_list,&res);
D2PRINTK("result %d class 0x%04x\n",result,res.classid);
switch (result) {
#ifdef CONFIG_NET_CLS_POLICE
case TC_POLICE_SHOT:
kfree_skb(skb);
break;
#if 0
case TC_POLICE_RECLASSIFY:
/* FIXME: what to do here ??? */
#endif
#endif
case TC_POLICE_OK:
skb->tc_index = TC_H_MIN(res.classid);
break;
case TC_POLICE_UNSPEC:
/* fall through */
default:
if (p->default_index != NO_DEFAULT_INDEX)
skb->tc_index = p->default_index;
break;
};
}
if (
#ifdef CONFIG_NET_CLS_POLICE
result == TC_POLICE_SHOT ||
#endif
((ret = p->q->enqueue(skb,p->q)) != 0)) {
sch->stats.drops++;
return ret;
}
sch->stats.bytes += skb->len;
sch->stats.packets++;
sch->q.qlen++;
return ret;
}
static struct sk_buff *dsmark_dequeue(struct Qdisc *sch)
{
struct dsmark_qdisc_data *p = PRIV(sch);
struct sk_buff *skb;
int index;
D2PRINTK("dsmark_dequeue(sch %p,[qdisc %p])\n",sch,p);
skb = p->q->ops->dequeue(p->q);
if (!skb)
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(skb->nh.iph,
p->mask[index],p->value[index]);
break;
case __constant_htons(ETH_P_IPV6):
ipv6_change_dsfield(skb->nh.ipv6h,
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",
htons(skb->protocol));
break;
};
return skb;
}
static int dsmark_requeue(struct sk_buff *skb,struct Qdisc *sch)
{
int ret;
struct dsmark_qdisc_data *p = PRIV(sch);
D2PRINTK("dsmark_requeue(skb %p,sch %p,[qdisc %p])\n",skb,sch,p);
if ((ret = p->q->ops->requeue(skb, p->q)) == 0) {
sch->q.qlen++;
return 0;
}
sch->stats.drops++;
return ret;
}
static int dsmark_drop(struct Qdisc *sch)
{
struct dsmark_qdisc_data *p = PRIV(sch);
DPRINTK("dsmark_reset(sch %p,[qdisc %p])\n",sch,p);
if (!p->q->ops->drop)
return 0;
if (!p->q->ops->drop(p->q))
return 0;
sch->q.qlen--;
return 1;
}
int dsmark_init(struct Qdisc *sch,struct rtattr *opt)
{
struct dsmark_qdisc_data *p = PRIV(sch);
struct rtattr *tb[TCA_DSMARK_MAX];
__u16 tmp;
DPRINTK("dsmark_init(sch %p,[qdisc %p],opt %p)\n",sch,p,opt);
if (rtattr_parse(tb,TCA_DSMARK_MAX,RTA_DATA(opt),RTA_PAYLOAD(opt)) < 0 ||
!tb[TCA_DSMARK_INDICES-1] ||
RTA_PAYLOAD(tb[TCA_DSMARK_INDICES-1]) < sizeof(__u16))
return -EINVAL;
memset(p,0,sizeof(*p));
p->filter_list = NULL;
p->indices = *(__u16 *) RTA_DATA(tb[TCA_DSMARK_INDICES-1]);
if (!p->indices)
return -EINVAL;
for (tmp = p->indices; tmp != 1; tmp >>= 1) {
if (tmp & 1)
return -EINVAL;
}
p->default_index = NO_DEFAULT_INDEX;
if (tb[TCA_DSMARK_DEFAULT_INDEX-1]) {
if (RTA_PAYLOAD(tb[TCA_DSMARK_DEFAULT_INDEX-1]) < sizeof(__u16))
return -EINVAL;
p->default_index =
*(__u16 *) RTA_DATA(tb[TCA_DSMARK_DEFAULT_INDEX-1]);
}
p->set_tc_index = !!tb[TCA_DSMARK_SET_TC_INDEX-1];
p->mask = kmalloc(p->indices*2,GFP_KERNEL);
if (!p->mask)
return -ENOMEM;
p->value = p->mask+p->indices;
memset(p->mask,0xff,p->indices);
memset(p->value,0,p->indices);
if (!(p->q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops)))
p->q = &noop_qdisc;
DPRINTK("dsmark_init: qdisc %p\n",&p->q);
MOD_INC_USE_COUNT;
return 0;
}
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);
struct tcf_proto *tp;
DPRINTK("dsmark_destroy(sch %p,[qdisc %p])\n",sch,p);
while (p->filter_list) {
tp = p->filter_list;
p->filter_list = tp->next;
tp->ops->destroy(tp);
}
qdisc_destroy(p->q);
p->q = &noop_qdisc;
kfree(p->mask);
MOD_DEC_USE_COUNT;
}
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);
unsigned char *b = skb->tail;
struct rtattr *rta;
DPRINTK("dsmark_dump_class(sch %p,[qdisc %p],class %ld\n",sch,p,cl);
if (!cl || cl > p->indices)
return -EINVAL;
tcm->tcm_handle = TC_H_MAKE(TC_H_MAJ(sch->handle),cl-1);
rta = (struct rtattr *) b;
RTA_PUT(skb,TCA_OPTIONS,0,NULL);
RTA_PUT(skb,TCA_DSMARK_MASK,1,&p->mask[cl-1]);
RTA_PUT(skb,TCA_DSMARK_VALUE,1,&p->value[cl-1]);
rta->rta_len = skb->tail-b;
return skb->len;
rtattr_failure:
skb_trim(skb,b-skb->data);
return -1;
}
static int dsmark_dump(struct Qdisc *sch, struct sk_buff *skb)
{
struct dsmark_qdisc_data *p = PRIV(sch);
unsigned char *b = skb->tail;
struct rtattr *rta;
rta = (struct rtattr *) b;
RTA_PUT(skb,TCA_OPTIONS,0,NULL);
RTA_PUT(skb,TCA_DSMARK_INDICES,sizeof(__u16),&p->indices);
if (p->default_index != NO_DEFAULT_INDEX) {
__u16 tmp = p->default_index;
RTA_PUT(skb,TCA_DSMARK_DEFAULT_INDEX, sizeof(__u16), &tmp);
}
if (p->set_tc_index)
RTA_PUT(skb, TCA_DSMARK_SET_TC_INDEX, 0, NULL);
rta->rta_len = skb->tail-b;
return skb->len;
rtattr_failure:
skb_trim(skb,b-skb->data);
return -1;
}
static struct Qdisc_class_ops dsmark_class_ops =
{
dsmark_graft, /* graft */
dsmark_leaf, /* leaf */
dsmark_get, /* get */
dsmark_put, /* put */
dsmark_change, /* change */
dsmark_delete, /* delete */
dsmark_walk, /* walk */
dsmark_find_tcf, /* tcf_chain */
dsmark_bind_filter, /* bind_tcf */
dsmark_put, /* unbind_tcf */
dsmark_dump_class, /* dump */
};
struct Qdisc_ops dsmark_qdisc_ops =
{
NULL, /* next */
&dsmark_class_ops, /* cl_ops */
"dsmark",
sizeof(struct dsmark_qdisc_data),
dsmark_enqueue, /* enqueue */
dsmark_dequeue, /* dequeue */
dsmark_requeue, /* requeue */
dsmark_drop, /* drop */
dsmark_init, /* init */
dsmark_reset, /* reset */
dsmark_destroy, /* destroy */
NULL, /* change */
dsmark_dump /* dump */
};
#ifdef MODULE
int init_module(void)
{
return register_qdisc(&dsmark_qdisc_ops);
}
void cleanup_module(void)
{
unregister_qdisc(&dsmark_qdisc_ops);
}
#endif
MODULE_LICENSE("GPL");
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