480 lines
11 KiB
C
480 lines
11 KiB
C
|
/* 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/init.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 <net/inet_ecn.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) 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;
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
/* ------------------------- 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->q.qlen = 0;
|
||
|
|
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_nested(tb, TCA_DSMARK_MAX, 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) {
|
||
|
|
/* FIXME: Safe with non-linear skbs? --RR */
|
||
|
|
switch (skb->protocol) {
|
||
|
|
case __constant_htons(ETH_P_IP):
|
||
|
|
skb->tc_index = ipv4_get_dsfield(skb->nh.iph)
|
||
|
|
& ~INET_ECN_MASK;
|
||
|
|
break;
|
||
|
|
case __constant_htons(ETH_P_IPV6):
|
||
|
|
skb->tc_index = ipv6_get_dsfield(skb->nh.ipv6h)
|
||
|
|
& ~INET_ECN_MASK;
|
||
|
|
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->qstats.drops++;
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
sch->bstats.bytes += skb->len;
|
||
|
|
sch->bstats.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++;
|
||
|
|
sch->qstats.requeues++;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
sch->qstats.drops++;
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
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)
|
||
|
|
return 0;
|
||
|
|
if (!(len = p->q->ops->drop(p->q)))
|
||
|
|
return 0;
|
||
|
|
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];
|
||
|
|
__u16 tmp;
|
||
|
|
|
||
|
|
DPRINTK("dsmark_init(sch %p,[qdisc %p],opt %p)\n",sch,p,opt);
|
||
|
|
if (!opt ||
|
||
|
|
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;
|
||
|
|
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);
|
||
|
|
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;
|
||
|
|
tcf_destroy(tp);
|
||
|
|
}
|
||
|
|
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);
|
||
|
|
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 = {
|
||
|
|
.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 = {
|
||
|
|
.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");
|