net/sched/sch_dsmark.c - kernel/msm-4.9 - Gitiles

 /* 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/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 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(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;
 		};
 	}

 	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_POLICE
 			case TC_POLICE_SHOT:
 				kfree_skb(skb);
 				sch->qstats.drops++;
 				return NET_XMIT_POLICED;
 #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;
 		};
 	}

 	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(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",
 				       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);
 	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);
 	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 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");
	/* 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/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 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(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;
	};
	}

	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_POLICE
	case TC_POLICE_SHOT:
	kfree_skb(skb);
	sch->qstats.drops++;
	return NET_XMIT_POLICED;
	#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;
	};
	}

	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(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",
	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);
	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);
	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 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");