[net-next-2.6.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/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(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_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(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 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
1da177e4 LT	6	#include <linux/module.h>
	7	#include <linux/init.h>
	8	#include <linux/types.h>
	9	#include <linux/string.h>
	10	#include <linux/errno.h>
	11	#include <linux/skbuff.h>
	12	#include <linux/netdevice.h> /* for pkt_sched */
	13	#include <linux/rtnetlink.h>
	14	#include <net/pkt_sched.h>
	15	#include <net/dsfield.h>
	16	#include <net/inet_ecn.h>
	17	#include <asm/byteorder.h>
	18
	19
08e9cd1f	20	#if 0 /* control */
1da177e4 LT	21	#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
	22	#else
	23	#define DPRINTK(format,args...)
	24	#endif
	25
	26	#if 0 /* data */
	27	#define D2PRINTK(format,args...) printk(KERN_DEBUG format,##args)
	28	#else
	29	#define D2PRINTK(format,args...)
	30	#endif
	31
	32
af0d1141	33	#define PRIV(sch) ((struct dsmark_qdisc_data *) qdisc_priv(sch))
1da177e4 LT	34
	35
	36	/*
	37	* classid class marking
	38	* ------- ----- -------
	39	* n/a 0 n/a
	40	* x:0 1 use entry [0]
	41	* ... ... ...
	42	* x:y y>0 y+1 use entry [y]
	43	* ... ... ...
	44	* x:indices-1 indices use entry [indices-1]
	45	* ... ... ...
	46	* x:y y+1 use entry [y & (indices-1)]
	47	* ... ... ...
	48	* 0xffff 0x10000 use entry [indices-1]
	49	*/
	50
	51
	52	#define NO_DEFAULT_INDEX (1 << 16)
	53
	54	struct dsmark_qdisc_data {
	55	struct Qdisc *q;
	56	struct tcf_proto *filter_list;
af0d1141 TG	57	u8 mask; / "owns" the array */
	58	u8 *value;
	59	u16 indices;
	60	u32 default_index; /* index range is 0...0xffff */
1da177e4 LT	61	int set_tc_index;
	62	};
	63
758cc43c TG	64	static inline int dsmark_valid_indices(u16 indices)
	65	{
	66	while (indices != 1) {
	67	if (indices & 1)
	68	return 0;
	69	indices >>= 1;
	70	}
10297b99	71
758cc43c TG	72	return 1;
	73	}
	74
	75	static inline int dsmark_valid_index(struct dsmark_qdisc_data *p, u16 index)
	76	{
	77	return (index <= p->indices && index > 0);
	78	}
1da177e4 LT	79
	80	/* ------------------------- Class/flow operations ------------------------- */
	81
af0d1141 TG	82	static int dsmark_graft(struct Qdisc *sch, unsigned long arg,
af0d1141 TG	83	struct Qdisc new, struct Qdisc *old)
1da177e4 LT	84	{
	85	struct dsmark_qdisc_data *p = PRIV(sch);
	86
af0d1141 TG	87	DPRINTK("dsmark_graft(sch %p,[qdisc %p],new %p,old %p)\n",
af0d1141 TG	88	sch, p, new, old);
486b53e5 TG	89
486b53e5 TG	90	if (new == NULL) {
9f9afec4 PM	91	new = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops,
9f9afec4 PM	92	sch->handle);
486b53e5 TG	93	if (new == NULL)
	94	new = &noop_qdisc;
	95	}
	96
1da177e4	97	sch_tree_lock(sch);
af0d1141	98	*old = xchg(&p->q, new);
5e50da01	99	qdisc_tree_decrease_qlen(old, (old)->q.qlen);
af0d1141	100	qdisc_reset(*old);
af0d1141 TG	101	sch_tree_unlock(sch);
af0d1141 TG	102
10297b99	103	return 0;
1da177e4 LT	104	}
1da177e4 LT	105
1da177e4 LT	106	static struct Qdisc dsmark_leaf(struct Qdisc sch, unsigned long arg)
1da177e4 LT	107	{
af0d1141	108	return PRIV(sch)->q;
1da177e4 LT	109	}
1da177e4 LT	110
af0d1141	111	static unsigned long dsmark_get(struct Qdisc *sch, u32 classid)
1da177e4	112	{
af0d1141 TG	113	DPRINTK("dsmark_get(sch %p,[qdisc %p],classid %x)\n",
af0d1141 TG	114	sch, PRIV(sch), classid);
1da177e4	115
af0d1141	116	return TC_H_MIN(classid) + 1;
1da177e4 LT	117	}
1da177e4 LT	118
1da177e4	119	static unsigned long dsmark_bind_filter(struct Qdisc *sch,
af0d1141	120	unsigned long parent, u32 classid)
1da177e4	121	{
af0d1141	122	return dsmark_get(sch, classid);
1da177e4 LT	123	}
1da177e4 LT	124
1da177e4 LT	125	static void dsmark_put(struct Qdisc *sch, unsigned long cl)
	126	{
	127	}
	128
1da177e4	129	static int dsmark_change(struct Qdisc *sch, u32 classid, u32 parent,
758cc43c	130	struct rtattr *tca, unsigned long arg)
1da177e4 LT	131	{
	132	struct dsmark_qdisc_data *p = PRIV(sch);
	133	struct rtattr *opt = tca[TCA_OPTIONS-1];
	134	struct rtattr *tb[TCA_DSMARK_MAX];
758cc43c TG	135	int err = -EINVAL;
758cc43c TG	136	u8 mask = 0;
1da177e4 LT	137
1da177e4 LT	138	DPRINTK("dsmark_change(sch %p,[qdisc %p],classid %x,parent %x),"
758cc43c TG	139	"arg 0x%lx\n", sch, p, classid, parent, *arg);
	140
	141	if (!dsmark_valid_index(p, *arg)) {
	142	err = -ENOENT;
	143	goto rtattr_failure;
1da177e4	144	}
1da177e4	145
758cc43c TG	146	if (!opt \|\| rtattr_parse_nested(tb, TCA_DSMARK_MAX, opt))
	147	goto rtattr_failure;
	148
	149	if (tb[TCA_DSMARK_MASK-1])
	150	mask = RTA_GET_U8(tb[TCA_DSMARK_MASK-1]);
	151
	152	if (tb[TCA_DSMARK_VALUE-1])
	153	p->value[*arg-1] = RTA_GET_U8(tb[TCA_DSMARK_VALUE-1]);
10297b99	154
758cc43c TG	155	if (tb[TCA_DSMARK_MASK-1])
	156	p->mask[*arg-1] = mask;
	157
	158	err = 0;
	159
	160	rtattr_failure:
	161	return err;
	162	}
1da177e4	163
af0d1141	164	static int dsmark_delete(struct Qdisc *sch, unsigned long arg)
1da177e4 LT	165	{
	166	struct dsmark_qdisc_data *p = PRIV(sch);
	167
af0d1141	168	if (!dsmark_valid_index(p, arg))
1da177e4	169	return -EINVAL;
10297b99	170
1da177e4 LT	171	p->mask[arg-1] = 0xff;
1da177e4 LT	172	p->value[arg-1] = 0;
af0d1141	173
1da177e4 LT	174	return 0;
	175	}
	176
1da177e4 LT	177	static void dsmark_walk(struct Qdisc sch,struct qdisc_walker walker)
	178	{
	179	struct dsmark_qdisc_data *p = PRIV(sch);
	180	int i;
	181
af0d1141 TG	182	DPRINTK("dsmark_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
af0d1141 TG	183
1da177e4 LT	184	if (walker->stop)
1da177e4 LT	185	return;
af0d1141	186
1da177e4 LT	187	for (i = 0; i < p->indices; i++) {
1da177e4 LT	188	if (p->mask[i] == 0xff && !p->value[i])
0451eb07	189	goto ignore;
1da177e4 LT	190	if (walker->count >= walker->skip) {
	191	if (walker->fn(sch, i+1, walker) < 0) {
	192	walker->stop = 1;
	193	break;
	194	}
	195	}
10297b99	196	ignore:
0451eb07	197	walker->count++;
10297b99	198	}
1da177e4 LT	199	}
1da177e4 LT	200
1da177e4 LT	201	static struct tcf_proto *dsmark_find_tcf(struct Qdisc sch,unsigned long cl)
1da177e4 LT	202	{
af0d1141	203	return &PRIV(sch)->filter_list;
1da177e4 LT	204	}
1da177e4 LT	205
1da177e4 LT	206	/* --------------------------- Qdisc operations ---------------------------- */
1da177e4 LT	207
1da177e4 LT	208	static int dsmark_enqueue(struct sk_buff skb,struct Qdisc sch)
	209	{
	210	struct dsmark_qdisc_data *p = PRIV(sch);
af0d1141 TG	211	int err;
	212
	213	D2PRINTK("dsmark_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
1da177e4	214
1da177e4 LT	215	if (p->set_tc_index) {
	216	/* FIXME: Safe with non-linear skbs? --RR */
	217	switch (skb->protocol) {
	218	case __constant_htons(ETH_P_IP):
eddc9ec5	219	skb->tc_index = ipv4_get_dsfield(ip_hdr(skb))
1da177e4 LT	220	& ~INET_ECN_MASK;
	221	break;
	222	case __constant_htons(ETH_P_IPV6):
0660e03f	223	skb->tc_index = ipv6_get_dsfield(ipv6_hdr(skb))
1da177e4 LT	224	& ~INET_ECN_MASK;
	225	break;
	226	default:
	227	skb->tc_index = 0;
	228	break;
3ff50b79	229	}
1da177e4	230	}
af0d1141 TG	231
af0d1141 TG	232	if (TC_H_MAJ(skb->priority) == sch->handle)
1da177e4	233	skb->tc_index = TC_H_MIN(skb->priority);
af0d1141 TG	234	else {
	235	struct tcf_result res;
	236	int result = tc_classify(skb, p->filter_list, &res);
	237
	238	D2PRINTK("result %d class 0x%04x\n", result, res.classid);
	239
1da177e4 LT	240	switch (result) {
	241	#ifdef CONFIG_NET_CLS_POLICE
	242	case TC_POLICE_SHOT:
	243	kfree_skb(skb);
af0d1141 TG	244	sch->qstats.drops++;
af0d1141 TG	245	return NET_XMIT_POLICED;
1da177e4 LT	246	#if 0
	247	case TC_POLICE_RECLASSIFY:
	248	/* FIXME: what to do here ??? */
	249	#endif
	250	#endif
	251	case TC_POLICE_OK:
	252	skb->tc_index = TC_H_MIN(res.classid);
	253	break;
	254	case TC_POLICE_UNSPEC:
	255	/* fall through */
	256	default:
	257	if (p->default_index != NO_DEFAULT_INDEX)
	258	skb->tc_index = p->default_index;
	259	break;
3ff50b79	260	}
1da177e4	261	}
1da177e4	262
af0d1141 TG	263	err = p->q->enqueue(skb,p->q);
af0d1141 TG	264	if (err != NET_XMIT_SUCCESS) {
1da177e4	265	sch->qstats.drops++;
af0d1141	266	return err;
1da177e4	267	}
af0d1141	268
1da177e4 LT	269	sch->bstats.bytes += skb->len;
	270	sch->bstats.packets++;
	271	sch->q.qlen++;
1da177e4	272
af0d1141 TG	273	return NET_XMIT_SUCCESS;
af0d1141 TG	274	}
1da177e4 LT	275
	276	static struct sk_buff dsmark_dequeue(struct Qdisc sch)
	277	{
	278	struct dsmark_qdisc_data *p = PRIV(sch);
	279	struct sk_buff *skb;
af0d1141 TG	280	u32 index;
	281
	282	D2PRINTK("dsmark_dequeue(sch %p,[qdisc %p])\n", sch, p);
1da177e4	283
1da177e4	284	skb = p->q->ops->dequeue(p->q);
af0d1141	285	if (skb == NULL)
1da177e4	286	return NULL;
af0d1141	287
1da177e4	288	sch->q.qlen--;
af0d1141 TG	289
	290	index = skb->tc_index & (p->indices - 1);
	291	D2PRINTK("index %d->%d\n", skb->tc_index, index);
	292
1da177e4 LT	293	switch (skb->protocol) {
1da177e4 LT	294	case __constant_htons(ETH_P_IP):
eddc9ec5	295	ipv4_change_dsfield(ip_hdr(skb), p->mask[index],
af0d1141	296	p->value[index]);
1da177e4 LT	297	break;
1da177e4 LT	298	case __constant_htons(ETH_P_IPV6):
0660e03f	299	ipv6_change_dsfield(ipv6_hdr(skb), p->mask[index],
af0d1141	300	p->value[index]);
1da177e4 LT	301	break;
	302	default:
	303	/*
	304	* Only complain if a change was actually attempted.
	305	* This way, we can send non-IP traffic through dsmark
	306	* and don't need yet another qdisc as a bypass.
	307	*/
	308	if (p->mask[index] != 0xff \|\| p->value[index])
	309	printk(KERN_WARNING "dsmark_dequeue: "
	310	"unsupported protocol %d\n",
66c6f529	311	ntohs(skb->protocol));
1da177e4	312	break;
3ff50b79	313	}
af0d1141	314
1da177e4 LT	315	return skb;
	316	}
	317
1da177e4 LT	318	static int dsmark_requeue(struct sk_buff skb,struct Qdisc sch)
1da177e4 LT	319	{
1da177e4	320	struct dsmark_qdisc_data *p = PRIV(sch);
af0d1141	321	int err;
1da177e4	322
af0d1141 TG	323	D2PRINTK("dsmark_requeue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
	324
	325	err = p->q->ops->requeue(skb, p->q);
	326	if (err != NET_XMIT_SUCCESS) {
	327	sch->qstats.drops++;
	328	return err;
1da177e4	329	}
1da177e4	330
af0d1141 TG	331	sch->q.qlen++;
	332	sch->qstats.requeues++;
	333
	334	return NET_XMIT_SUCCESS;
	335	}
1da177e4 LT	336
	337	static unsigned int dsmark_drop(struct Qdisc *sch)
	338	{
	339	struct dsmark_qdisc_data *p = PRIV(sch);
	340	unsigned int len;
10297b99	341
af0d1141 TG	342	DPRINTK("dsmark_reset(sch %p,[qdisc %p])\n", sch, p);
	343
	344	if (p->q->ops->drop == NULL)
1da177e4	345	return 0;
af0d1141 TG	346
	347	len = p->q->ops->drop(p->q);
	348	if (len)
	349	sch->q.qlen--;
	350
1da177e4 LT	351	return len;
	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
9f9afec4	391	p->q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, sch->handle);
758cc43c	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	}
1da177e4 LT	402
1da177e4 LT	403	static void dsmark_reset(struct Qdisc *sch)
	404	{
	405	struct dsmark_qdisc_data *p = PRIV(sch);
	406
af0d1141	407	DPRINTK("dsmark_reset(sch %p,[qdisc %p])\n", sch, p);
1da177e4 LT	408	qdisc_reset(p->q);
	409	sch->q.qlen = 0;
	410	}
	411
1da177e4 LT	412	static void dsmark_destroy(struct Qdisc *sch)
	413	{
	414	struct dsmark_qdisc_data *p = PRIV(sch);
1da177e4	415
af0d1141 TG	416	DPRINTK("dsmark_destroy(sch %p,[qdisc %p])\n", sch, p);
af0d1141 TG	417
a48b5a61	418	tcf_destroy_chain(p->filter_list);
1da177e4 LT	419	qdisc_destroy(p->q);
	420	kfree(p->mask);
	421	}
	422
1da177e4	423	static int dsmark_dump_class(struct Qdisc *sch, unsigned long cl,
02f23f09	424	struct sk_buff skb, struct tcmsg tcm)
1da177e4 LT	425	{
1da177e4 LT	426	struct dsmark_qdisc_data *p = PRIV(sch);
02f23f09	427	struct rtattr *opts = NULL;
1da177e4	428
02f23f09 TG	429	DPRINTK("dsmark_dump_class(sch %p,[qdisc %p],class %ld\n", sch, p, cl);
	430
	431	if (!dsmark_valid_index(p, cl))
1da177e4	432	return -EINVAL;
02f23f09 TG	433
02f23f09 TG	434	tcm->tcm_handle = TC_H_MAKE(TC_H_MAJ(sch->handle), cl-1);
cdc7f8e3	435	tcm->tcm_info = p->q->handle;
02f23f09 TG	436
	437	opts = RTA_NEST(skb, TCA_OPTIONS);
	438	RTA_PUT_U8(skb,TCA_DSMARK_MASK, p->mask[cl-1]);
	439	RTA_PUT_U8(skb,TCA_DSMARK_VALUE, p->value[cl-1]);
	440
	441	return RTA_NEST_END(skb, opts);
1da177e4 LT	442
1da177e4 LT	443	rtattr_failure:
02f23f09	444	return RTA_NEST_CANCEL(skb, opts);
1da177e4 LT	445	}
	446
	447	static int dsmark_dump(struct Qdisc sch, struct sk_buff skb)
	448	{
	449	struct dsmark_qdisc_data *p = PRIV(sch);
02f23f09	450	struct rtattr *opts = NULL;
1da177e4	451
02f23f09 TG	452	opts = RTA_NEST(skb, TCA_OPTIONS);
	453	RTA_PUT_U16(skb, TCA_DSMARK_INDICES, p->indices);
	454
	455	if (p->default_index != NO_DEFAULT_INDEX)
	456	RTA_PUT_U16(skb, TCA_DSMARK_DEFAULT_INDEX, p->default_index);
1da177e4	457
1da177e4	458	if (p->set_tc_index)
02f23f09 TG	459	RTA_PUT_FLAG(skb, TCA_DSMARK_SET_TC_INDEX);
	460
	461	return RTA_NEST_END(skb, opts);
1da177e4 LT	462
1da177e4 LT	463	rtattr_failure:
02f23f09	464	return RTA_NEST_CANCEL(skb, opts);
1da177e4 LT	465	}
	466
	467	static struct Qdisc_class_ops dsmark_class_ops = {
	468	.graft = dsmark_graft,
	469	.leaf = dsmark_leaf,
	470	.get = dsmark_get,
	471	.put = dsmark_put,
	472	.change = dsmark_change,
	473	.delete = dsmark_delete,
	474	.walk = dsmark_walk,
	475	.tcf_chain = dsmark_find_tcf,
	476	.bind_tcf = dsmark_bind_filter,
	477	.unbind_tcf = dsmark_put,
	478	.dump = dsmark_dump_class,
	479	};
	480
	481	static struct Qdisc_ops dsmark_qdisc_ops = {
	482	.next = NULL,
	483	.cl_ops = &dsmark_class_ops,
	484	.id = "dsmark",
	485	.priv_size = sizeof(struct dsmark_qdisc_data),
	486	.enqueue = dsmark_enqueue,
	487	.dequeue = dsmark_dequeue,
	488	.requeue = dsmark_requeue,
	489	.drop = dsmark_drop,
	490	.init = dsmark_init,
	491	.reset = dsmark_reset,
	492	.destroy = dsmark_destroy,
	493	.change = NULL,
	494	.dump = dsmark_dump,
	495	.owner = THIS_MODULE,
	496	};
	497
	498	static int __init dsmark_module_init(void)
	499	{
	500	return register_qdisc(&dsmark_qdisc_ops);
	501	}
af0d1141	502
10297b99	503	static void __exit dsmark_module_exit(void)
1da177e4 LT	504	{
	505	unregister_qdisc(&dsmark_qdisc_ops);
	506	}
af0d1141	507
1da177e4 LT	508	module_init(dsmark_module_init)
1da177e4 LT	509	module_exit(dsmark_module_exit)
af0d1141	510
1da177e4	511	MODULE_LICENSE("GPL");