[linux-2.6-block.git] / net / sched / sch_dsmark.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 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) 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);
		if (new == NULL)
			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];
	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 (!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])
			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)
{
	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];
	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);
	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);

	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");
Commit	Line	Data
1da177e4 LT	1	/* net/sched/sch_dsmark.c - Differentiated Services field marker */
	2
	3	/* Written 1998-2000 by Werner Almesberger, EPFL ICA */
	4
	5
	6	#include <linux/config.h>
	7	#include <linux/module.h>
	8	#include <linux/init.h>
	9	#include <linux/types.h>
	10	#include <linux/string.h>
	11	#include <linux/errno.h>
	12	#include <linux/skbuff.h>
	13	#include <linux/netdevice.h> /* for pkt_sched */
	14	#include <linux/rtnetlink.h>
	15	#include <net/pkt_sched.h>
	16	#include <net/dsfield.h>
	17	#include <net/inet_ecn.h>
	18	#include <asm/byteorder.h>
	19
	20
08e9cd1f	21	#if 0 /* control */
1da177e4 LT	22	#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
	23	#else
	24	#define DPRINTK(format,args...)
	25	#endif
	26
	27	#if 0 /* data */
	28	#define D2PRINTK(format,args...) printk(KERN_DEBUG format,##args)
	29	#else
	30	#define D2PRINTK(format,args...)
	31	#endif
	32
	33
	34	#define PRIV(sch) qdisc_priv(sch)
	35
	36
	37	/*
	38	* classid class marking
	39	* ------- ----- -------
	40	* n/a 0 n/a
	41	* x:0 1 use entry [0]
	42	* ... ... ...
	43	* x:y y>0 y+1 use entry [y]
	44	* ... ... ...
	45	* x:indices-1 indices use entry [indices-1]
	46	* ... ... ...
	47	* x:y y+1 use entry [y & (indices-1)]
	48	* ... ... ...
	49	* 0xffff 0x10000 use entry [indices-1]
	50	*/
	51
	52
	53	#define NO_DEFAULT_INDEX (1 << 16)
	54
	55	struct dsmark_qdisc_data {
	56	struct Qdisc *q;
	57	struct tcf_proto *filter_list;
	58	__u8 mask; / "owns" the array */
	59	__u8 *value;
	60	__u16 indices;
	61	__u32 default_index; /* index range is 0...0xffff */
	62	int set_tc_index;
	63	};
	64
758cc43c TG	65	static inline int dsmark_valid_indices(u16 indices)
	66	{
	67	while (indices != 1) {
	68	if (indices & 1)
	69	return 0;
	70	indices >>= 1;
	71	}
	72
	73	return 1;
	74	}
	75
	76	static inline int dsmark_valid_index(struct dsmark_qdisc_data *p, u16 index)
	77	{
	78	return (index <= p->indices && index > 0);
	79	}
1da177e4 LT	80
	81	/* ------------------------- Class/flow operations ------------------------- */
	82
	83
	84	static int dsmark_graft(struct Qdisc *sch,unsigned long arg,
	85	struct Qdisc new,struct Qdisc *old)
	86	{
	87	struct dsmark_qdisc_data *p = PRIV(sch);
	88
	89	DPRINTK("dsmark_graft(sch %p,[qdisc %p],new %p,old %p)\n",sch,p,new,
	90	old);
486b53e5 TG	91
	92	if (new == NULL) {
	93	new = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops);
	94	if (new == NULL)
	95	new = &noop_qdisc;
	96	}
	97
1da177e4 LT	98	sch_tree_lock(sch);
	99	*old = xchg(&p->q,new);
	100	if (*old)
	101	qdisc_reset(*old);
	102	sch->q.qlen = 0;
	103	sch_tree_unlock(sch); /* @@@ move up ? */
	104	return 0;
	105	}
	106
	107
	108	static struct Qdisc dsmark_leaf(struct Qdisc sch, unsigned long arg)
	109	{
	110	struct dsmark_qdisc_data *p = PRIV(sch);
	111
	112	return p->q;
	113	}
	114
	115
	116	static unsigned long dsmark_get(struct Qdisc *sch,u32 classid)
	117	{
	118	struct dsmark_qdisc_data *p __attribute__((unused)) = PRIV(sch);
	119
	120	DPRINTK("dsmark_get(sch %p,[qdisc %p],classid %x)\n",sch,p,classid);
	121	return TC_H_MIN(classid)+1;
	122	}
	123
	124
	125	static unsigned long dsmark_bind_filter(struct Qdisc *sch,
	126	unsigned long parent, u32 classid)
	127	{
	128	return dsmark_get(sch,classid);
	129	}
	130
	131
	132	static void dsmark_put(struct Qdisc *sch, unsigned long cl)
	133	{
	134	}
	135
	136
	137	static int dsmark_change(struct Qdisc *sch, u32 classid, u32 parent,
758cc43c	138	struct rtattr *tca, unsigned long arg)
1da177e4 LT	139	{
	140	struct dsmark_qdisc_data *p = PRIV(sch);
	141	struct rtattr *opt = tca[TCA_OPTIONS-1];
	142	struct rtattr *tb[TCA_DSMARK_MAX];
758cc43c TG	143	int err = -EINVAL;
758cc43c TG	144	u8 mask = 0;
1da177e4 LT	145
1da177e4 LT	146	DPRINTK("dsmark_change(sch %p,[qdisc %p],classid %x,parent %x),"
758cc43c TG	147	"arg 0x%lx\n", sch, p, classid, parent, *arg);
	148
	149	if (!dsmark_valid_index(p, *arg)) {
	150	err = -ENOENT;
	151	goto rtattr_failure;
1da177e4	152	}
1da177e4	153
758cc43c TG	154	if (!opt \|\| rtattr_parse_nested(tb, TCA_DSMARK_MAX, opt))
	155	goto rtattr_failure;
	156
	157	if (tb[TCA_DSMARK_MASK-1])
	158	mask = RTA_GET_U8(tb[TCA_DSMARK_MASK-1]);
	159
	160	if (tb[TCA_DSMARK_VALUE-1])
	161	p->value[*arg-1] = RTA_GET_U8(tb[TCA_DSMARK_VALUE-1]);
	162
	163	if (tb[TCA_DSMARK_MASK-1])
	164	p->mask[*arg-1] = mask;
	165
	166	err = 0;
	167
	168	rtattr_failure:
	169	return err;
	170	}
1da177e4 LT	171
	172	static int dsmark_delete(struct Qdisc *sch,unsigned long arg)
	173	{
	174	struct dsmark_qdisc_data *p = PRIV(sch);
	175
	176	if (!arg \|\| arg > p->indices)
	177	return -EINVAL;
	178	p->mask[arg-1] = 0xff;
	179	p->value[arg-1] = 0;
	180	return 0;
	181	}
	182
	183
	184	static void dsmark_walk(struct Qdisc sch,struct qdisc_walker walker)
	185	{
	186	struct dsmark_qdisc_data *p = PRIV(sch);
	187	int i;
	188
	189	DPRINTK("dsmark_walk(sch %p,[qdisc %p],walker %p)\n",sch,p,walker);
	190	if (walker->stop)
	191	return;
	192	for (i = 0; i < p->indices; i++) {
	193	if (p->mask[i] == 0xff && !p->value[i])
0451eb07	194	goto ignore;
1da177e4 LT	195	if (walker->count >= walker->skip) {
	196	if (walker->fn(sch, i+1, walker) < 0) {
	197	walker->stop = 1;
	198	break;
	199	}
	200	}
0451eb07 TG	201	ignore:
0451eb07 TG	202	walker->count++;
1da177e4 LT	203	}
	204	}
	205
	206
	207	static struct tcf_proto *dsmark_find_tcf(struct Qdisc sch,unsigned long cl)
	208	{
	209	struct dsmark_qdisc_data *p = PRIV(sch);
	210
	211	return &p->filter_list;
	212	}
	213
	214
	215	/* --------------------------- Qdisc operations ---------------------------- */
	216
	217
	218	static int dsmark_enqueue(struct sk_buff skb,struct Qdisc sch)
	219	{
	220	struct dsmark_qdisc_data *p = PRIV(sch);
	221	struct tcf_result res;
	222	int result;
	223	int ret = NET_XMIT_POLICED;
	224
	225	D2PRINTK("dsmark_enqueue(skb %p,sch %p,[qdisc %p])\n",skb,sch,p);
	226	if (p->set_tc_index) {
	227	/* FIXME: Safe with non-linear skbs? --RR */
	228	switch (skb->protocol) {
	229	case __constant_htons(ETH_P_IP):
	230	skb->tc_index = ipv4_get_dsfield(skb->nh.iph)
	231	& ~INET_ECN_MASK;
	232	break;
	233	case __constant_htons(ETH_P_IPV6):
	234	skb->tc_index = ipv6_get_dsfield(skb->nh.ipv6h)
	235	& ~INET_ECN_MASK;
	236	break;
	237	default:
	238	skb->tc_index = 0;
	239	break;
	240	};
	241	}
	242	result = TC_POLICE_OK; /* be nice to gcc */
	243	if (TC_H_MAJ(skb->priority) == sch->handle) {
	244	skb->tc_index = TC_H_MIN(skb->priority);
	245	} else {
	246	result = tc_classify(skb,p->filter_list,&res);
	247	D2PRINTK("result %d class 0x%04x\n",result,res.classid);
	248	switch (result) {
	249	#ifdef CONFIG_NET_CLS_POLICE
	250	case TC_POLICE_SHOT:
	251	kfree_skb(skb);
	252	break;
	253	#if 0
	254	case TC_POLICE_RECLASSIFY:
	255	/* FIXME: what to do here ??? */
	256	#endif
	257	#endif
	258	case TC_POLICE_OK:
	259	skb->tc_index = TC_H_MIN(res.classid);
	260	break;
	261	case TC_POLICE_UNSPEC:
	262	/* fall through */
	263	default:
	264	if (p->default_index != NO_DEFAULT_INDEX)
	265	skb->tc_index = p->default_index;
	266	break;
267	};
268	}
269	if (
270	#ifdef CONFIG_NET_CLS_POLICE
271	result == TC_POLICE_SHOT \|\|
272	#endif
273
274	((ret = p->q->enqueue(skb,p->q)) != 0)) {
275	sch->qstats.drops++;
276	return ret;
277	}
278	sch->bstats.bytes += skb->len;
279	sch->bstats.packets++;
280	sch->q.qlen++;
281	return ret;
282	}
283
284
285	static struct sk_buff dsmark_dequeue(struct Qdisc sch)
286	{
287	struct dsmark_qdisc_data *p = PRIV(sch);
288	struct sk_buff *skb;
289	int index;
290
291	D2PRINTK("dsmark_dequeue(sch %p,[qdisc %p])\n",sch,p);
292	skb = p->q->ops->dequeue(p->q);
293	if (!skb)
294	return NULL;
295	sch->q.qlen--;
296	index = skb->tc_index & (p->indices-1);
297	D2PRINTK("index %d->%d\n",skb->tc_index,index);
298	switch (skb->protocol) {
299	case __constant_htons(ETH_P_IP):
300	ipv4_change_dsfield(skb->nh.iph,
301	p->mask[index],p->value[index]);
302	break;
303	case __constant_htons(ETH_P_IPV6):
304	ipv6_change_dsfield(skb->nh.ipv6h,
305	p->mask[index],p->value[index]);
306	break;
307	default:
308	/*
309	* Only complain if a change was actually attempted.
310	* This way, we can send non-IP traffic through dsmark
311	* and don't need yet another qdisc as a bypass.
312	*/
313	if (p->mask[index] != 0xff \|\| p->value[index])
314	printk(KERN_WARNING "dsmark_dequeue: "
315	"unsupported protocol %d\n",
316	htons(skb->protocol));
317	break;
318	};
319	return skb;
320	}
321
322
323	static int dsmark_requeue(struct sk_buff skb,struct Qdisc sch)
324	{
325	int ret;
326	struct dsmark_qdisc_data *p = PRIV(sch);
327
328	D2PRINTK("dsmark_requeue(skb %p,sch %p,[qdisc %p])\n",skb,sch,p);
329	if ((ret = p->q->ops->requeue(skb, p->q)) == 0) {
330	sch->q.qlen++;
331	sch->qstats.requeues++;
332	return 0;
333	}
334	sch->qstats.drops++;
335	return ret;
336	}
337
338
339	static unsigned int dsmark_drop(struct Qdisc *sch)
340	{
341	struct dsmark_qdisc_data *p = PRIV(sch);
342	unsigned int len;
343
344	DPRINTK("dsmark_reset(sch %p,[qdisc %p])\n",sch,p);
345	if (!p->q->ops->drop)
346	return 0;
347	if (!(len = p->q->ops->drop(p->q)))
348	return 0;
349	sch->q.qlen--;
350	return len;
351	}
352
353
758cc43c	354	static int dsmark_init(struct Qdisc sch, struct rtattr opt)
1da177e4 LT	355	{
	356	struct dsmark_qdisc_data *p = PRIV(sch);
	357	struct rtattr *tb[TCA_DSMARK_MAX];
758cc43c TG	358	int err = -EINVAL;
	359	u32 default_index = NO_DEFAULT_INDEX;
	360	u16 indices;
	361	u8 *mask;
	362
	363	DPRINTK("dsmark_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
	364
	365	if (!opt \|\| rtattr_parse_nested(tb, TCA_DSMARK_MAX, opt) < 0)
	366	goto errout;
	367
	368	indices = RTA_GET_U16(tb[TCA_DSMARK_INDICES-1]);
	369	if (!indices \|\| !dsmark_valid_indices(indices))
	370	goto errout;
	371
	372	if (tb[TCA_DSMARK_DEFAULT_INDEX-1])
	373	default_index = RTA_GET_U16(tb[TCA_DSMARK_DEFAULT_INDEX-1]);
	374
	375	mask = kmalloc(indices * 2, GFP_KERNEL);
	376	if (mask == NULL) {
	377	err = -ENOMEM;
	378	goto errout;
1da177e4	379	}
758cc43c TG	380
	381	p->mask = mask;
	382	memset(p->mask, 0xff, indices);
	383
	384	p->value = p->mask + indices;
	385	memset(p->value, 0, indices);
	386
	387	p->indices = indices;
	388	p->default_index = default_index;
	389	p->set_tc_index = RTA_GET_FLAG(tb[TCA_DSMARK_SET_TC_INDEX-1]);
	390
	391	p->q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops);
	392	if (p->q == NULL)
1da177e4	393	p->q = &noop_qdisc;
758cc43c TG	394
	395	DPRINTK("dsmark_init: qdisc %p\n", p->q);
	396
	397	err = 0;
	398	errout:
	399	rtattr_failure:
	400	return err;
1da177e4 LT	401	}
	402
	403
	404	static void dsmark_reset(struct Qdisc *sch)
	405	{
	406	struct dsmark_qdisc_data *p = PRIV(sch);
	407
	408	DPRINTK("dsmark_reset(sch %p,[qdisc %p])\n",sch,p);
	409	qdisc_reset(p->q);
	410	sch->q.qlen = 0;
	411	}
	412
	413
	414	static void dsmark_destroy(struct Qdisc *sch)
	415	{
	416	struct dsmark_qdisc_data *p = PRIV(sch);
	417	struct tcf_proto *tp;
	418
	419	DPRINTK("dsmark_destroy(sch %p,[qdisc %p])\n",sch,p);
	420	while (p->filter_list) {
	421	tp = p->filter_list;
	422	p->filter_list = tp->next;
	423	tcf_destroy(tp);
	424	}
	425	qdisc_destroy(p->q);
	426	kfree(p->mask);
	427	}
	428
	429
	430	static int dsmark_dump_class(struct Qdisc *sch, unsigned long cl,
02f23f09	431	struct sk_buff skb, struct tcmsg tcm)
1da177e4 LT	432	{
1da177e4 LT	433	struct dsmark_qdisc_data *p = PRIV(sch);
02f23f09	434	struct rtattr *opts = NULL;
1da177e4	435
02f23f09 TG	436	DPRINTK("dsmark_dump_class(sch %p,[qdisc %p],class %ld\n", sch, p, cl);
	437
	438	if (!dsmark_valid_index(p, cl))
1da177e4	439	return -EINVAL;
02f23f09 TG	440
	441	tcm->tcm_handle = TC_H_MAKE(TC_H_MAJ(sch->handle), cl-1);
	442
	443	opts = RTA_NEST(skb, TCA_OPTIONS);
	444	RTA_PUT_U8(skb,TCA_DSMARK_MASK, p->mask[cl-1]);
	445	RTA_PUT_U8(skb,TCA_DSMARK_VALUE, p->value[cl-1]);
	446
	447	return RTA_NEST_END(skb, opts);
1da177e4 LT	448
1da177e4 LT	449	rtattr_failure:
02f23f09	450	return RTA_NEST_CANCEL(skb, opts);
1da177e4 LT	451	}
	452
	453	static int dsmark_dump(struct Qdisc sch, struct sk_buff skb)
	454	{
	455	struct dsmark_qdisc_data *p = PRIV(sch);
02f23f09	456	struct rtattr *opts = NULL;
1da177e4	457
02f23f09 TG	458	opts = RTA_NEST(skb, TCA_OPTIONS);
	459	RTA_PUT_U16(skb, TCA_DSMARK_INDICES, p->indices);
	460
	461	if (p->default_index != NO_DEFAULT_INDEX)
	462	RTA_PUT_U16(skb, TCA_DSMARK_DEFAULT_INDEX, p->default_index);
1da177e4	463
1da177e4	464	if (p->set_tc_index)
02f23f09 TG	465	RTA_PUT_FLAG(skb, TCA_DSMARK_SET_TC_INDEX);
	466
	467	return RTA_NEST_END(skb, opts);
1da177e4 LT	468
1da177e4 LT	469	rtattr_failure:
02f23f09	470	return RTA_NEST_CANCEL(skb, opts);
1da177e4 LT	471	}
	472
	473	static struct Qdisc_class_ops dsmark_class_ops = {
	474	.graft = dsmark_graft,
	475	.leaf = dsmark_leaf,
	476	.get = dsmark_get,
	477	.put = dsmark_put,
	478	.change = dsmark_change,
	479	.delete = dsmark_delete,
	480	.walk = dsmark_walk,
	481	.tcf_chain = dsmark_find_tcf,
	482	.bind_tcf = dsmark_bind_filter,
	483	.unbind_tcf = dsmark_put,
	484	.dump = dsmark_dump_class,
	485	};
	486
	487	static struct Qdisc_ops dsmark_qdisc_ops = {
	488	.next = NULL,
	489	.cl_ops = &dsmark_class_ops,
	490	.id = "dsmark",
	491	.priv_size = sizeof(struct dsmark_qdisc_data),
	492	.enqueue = dsmark_enqueue,
	493	.dequeue = dsmark_dequeue,
	494	.requeue = dsmark_requeue,
	495	.drop = dsmark_drop,
	496	.init = dsmark_init,
	497	.reset = dsmark_reset,
	498	.destroy = dsmark_destroy,
	499	.change = NULL,
	500	.dump = dsmark_dump,
	501	.owner = THIS_MODULE,
	502	};
	503
	504	static int __init dsmark_module_init(void)
	505	{
	506	return register_qdisc(&dsmark_qdisc_ops);
	507	}
	508	static void __exit dsmark_module_exit(void)
	509	{
	510	unregister_qdisc(&dsmark_qdisc_ops);
	511	}
	512	module_init(dsmark_module_init)
	513	module_exit(dsmark_module_exit)
	514	MODULE_LICENSE("GPL");