[deliverable/linux.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/rtnetlink.h>
#include <linux/bitops.h>
#include <net/pkt_sched.h>
#include <net/dsfield.h>
#include <net/inet_ecn.h>
#include <asm/byteorder.h>

/*
 * 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_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 = qdisc_priv(sch);

	pr_debug("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)
{
	struct dsmark_qdisc_data *p = qdisc_priv(sch);
	return p->q;
}

static unsigned long dsmark_get(struct Qdisc *sch, u32 classid)
{
	pr_debug("dsmark_get(sch %p,[qdisc %p],classid %x)\n",
		sch, qdisc_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 = qdisc_priv(sch);
	struct rtattr *opt = tca[TCA_OPTIONS-1];
	struct rtattr *tb[TCA_DSMARK_MAX];
	int err = -EINVAL;
	u8 mask = 0;

	pr_debug("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 = qdisc_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 = qdisc_priv(sch);
	int i;

	pr_debug("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 inline struct tcf_proto **dsmark_find_tcf(struct Qdisc *sch,unsigned long cl)
{
	struct dsmark_qdisc_data *p = qdisc_priv(sch);
	return &p->filter_list;
}

/* --------------------------- Qdisc operations ---------------------------- */

static int dsmark_enqueue(struct sk_buff *skb,struct Qdisc *sch)
{
	struct dsmark_qdisc_data *p = qdisc_priv(sch);
	int err;

	pr_debug("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):
				if (skb_cow_head(skb, sizeof(struct iphdr)))
					goto drop;

				skb->tc_index = ipv4_get_dsfield(ip_hdr(skb))
					& ~INET_ECN_MASK;
				break;

			case __constant_htons(ETH_P_IPV6):
				if (skb_cow_head(skb, sizeof(struct ipv6hdr)))
					goto drop;

				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);

		pr_debug("result %d class 0x%04x\n", result, res.classid);

		switch (result) {
#ifdef CONFIG_NET_CLS_ACT
		case TC_ACT_QUEUED:
		case TC_ACT_STOLEN:
			kfree_skb(skb);
			return NET_XMIT_SUCCESS;

		case TC_ACT_SHOT:
			goto drop;
#endif
		case TC_ACT_OK:
			skb->tc_index = TC_H_MIN(res.classid);
			break;

		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;

drop:
	kfree_skb(skb);
	sch->qstats.drops++;
	return NET_XMIT_BYPASS;
}

static struct sk_buff *dsmark_dequeue(struct Qdisc *sch)
{
	struct dsmark_qdisc_data *p = qdisc_priv(sch);
	struct sk_buff *skb;
	u32 index;

	pr_debug("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);
	pr_debug("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 = qdisc_priv(sch);
	int err;

	pr_debug("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 = qdisc_priv(sch);
	unsigned int len;

	pr_debug("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 = qdisc_priv(sch);
	struct rtattr *tb[TCA_DSMARK_MAX];
	int err = -EINVAL;
	u32 default_index = NO_DEFAULT_INDEX;
	u16 indices;
	u8 *mask;

	pr_debug("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 (hweight32(indices) != 1)
		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;

	pr_debug("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 = qdisc_priv(sch);

	pr_debug("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 = qdisc_priv(sch);

	pr_debug("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 = qdisc_priv(sch);
	struct rtattr *opts = NULL;

	pr_debug("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 = qdisc_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 const 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 __read_mostly = {
	.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>
1da177e4	12	#include <linux/rtnetlink.h>
5b0ac72b	13	#include <linux/bitops.h>
1da177e4 LT	14	#include <net/pkt_sched.h>
	15	#include <net/dsfield.h>
	16	#include <net/inet_ecn.h>
	17	#include <asm/byteorder.h>
	18
1da177e4 LT	19	/*
	20	* classid class marking
	21	* ------- ----- -------
	22	* n/a 0 n/a
	23	* x:0 1 use entry [0]
	24	* ... ... ...
	25	* x:y y>0 y+1 use entry [y]
	26	* ... ... ...
	27	* x:indices-1 indices use entry [indices-1]
	28	* ... ... ...
	29	* x:y y+1 use entry [y & (indices-1)]
	30	* ... ... ...
	31	* 0xffff 0x10000 use entry [indices-1]
	32	*/
	33
	34
	35	#define NO_DEFAULT_INDEX (1 << 16)
	36
	37	struct dsmark_qdisc_data {
	38	struct Qdisc *q;
	39	struct tcf_proto *filter_list;
af0d1141 TG	40	u8 mask; / "owns" the array */
	41	u8 *value;
	42	u16 indices;
	43	u32 default_index; /* index range is 0...0xffff */
1da177e4 LT	44	int set_tc_index;
	45	};
	46
758cc43c TG	47	static inline int dsmark_valid_index(struct dsmark_qdisc_data *p, u16 index)
	48	{
	49	return (index <= p->indices && index > 0);
	50	}
1da177e4 LT	51
	52	/* ------------------------- Class/flow operations ------------------------- */
	53
af0d1141 TG	54	static int dsmark_graft(struct Qdisc *sch, unsigned long arg,
af0d1141 TG	55	struct Qdisc new, struct Qdisc *old)
1da177e4	56	{
81da99ed	57	struct dsmark_qdisc_data *p = qdisc_priv(sch);
1da177e4	58
81da99ed	59	pr_debug("dsmark_graft(sch %p,[qdisc %p],new %p,old %p)\n",
af0d1141	60	sch, p, new, old);
486b53e5 TG	61
486b53e5 TG	62	if (new == NULL) {
9f9afec4 PM	63	new = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops,
9f9afec4 PM	64	sch->handle);
486b53e5 TG	65	if (new == NULL)
	66	new = &noop_qdisc;
	67	}
	68
1da177e4	69	sch_tree_lock(sch);
af0d1141	70	*old = xchg(&p->q, new);
5e50da01	71	qdisc_tree_decrease_qlen(old, (old)->q.qlen);
af0d1141	72	qdisc_reset(*old);
af0d1141 TG	73	sch_tree_unlock(sch);
af0d1141 TG	74
10297b99	75	return 0;
1da177e4 LT	76	}
1da177e4 LT	77
1da177e4 LT	78	static struct Qdisc dsmark_leaf(struct Qdisc sch, unsigned long arg)
1da177e4 LT	79	{
81da99ed SH	80	struct dsmark_qdisc_data *p = qdisc_priv(sch);
81da99ed SH	81	return p->q;
1da177e4 LT	82	}
1da177e4 LT	83
af0d1141	84	static unsigned long dsmark_get(struct Qdisc *sch, u32 classid)
1da177e4	85	{
81da99ed SH	86	pr_debug("dsmark_get(sch %p,[qdisc %p],classid %x)\n",
81da99ed SH	87	sch, qdisc_priv(sch), classid);
1da177e4	88
af0d1141	89	return TC_H_MIN(classid) + 1;
1da177e4 LT	90	}
1da177e4 LT	91
1da177e4	92	static unsigned long dsmark_bind_filter(struct Qdisc *sch,
af0d1141	93	unsigned long parent, u32 classid)
1da177e4	94	{
af0d1141	95	return dsmark_get(sch, classid);
1da177e4 LT	96	}
1da177e4 LT	97
1da177e4 LT	98	static void dsmark_put(struct Qdisc *sch, unsigned long cl)
	99	{
	100	}
	101
1da177e4	102	static int dsmark_change(struct Qdisc *sch, u32 classid, u32 parent,
758cc43c	103	struct rtattr *tca, unsigned long arg)
1da177e4	104	{
81da99ed	105	struct dsmark_qdisc_data *p = qdisc_priv(sch);
1da177e4 LT	106	struct rtattr *opt = tca[TCA_OPTIONS-1];
1da177e4 LT	107	struct rtattr *tb[TCA_DSMARK_MAX];
758cc43c TG	108	int err = -EINVAL;
758cc43c TG	109	u8 mask = 0;
1da177e4	110
81da99ed	111	pr_debug("dsmark_change(sch %p,[qdisc %p],classid %x,parent %x),"
758cc43c TG	112	"arg 0x%lx\n", sch, p, classid, parent, *arg);
	113
	114	if (!dsmark_valid_index(p, *arg)) {
	115	err = -ENOENT;
	116	goto rtattr_failure;
1da177e4	117	}
1da177e4	118
758cc43c TG	119	if (!opt \|\| rtattr_parse_nested(tb, TCA_DSMARK_MAX, opt))
	120	goto rtattr_failure;
	121
	122	if (tb[TCA_DSMARK_MASK-1])
	123	mask = RTA_GET_U8(tb[TCA_DSMARK_MASK-1]);
	124
	125	if (tb[TCA_DSMARK_VALUE-1])
	126	p->value[*arg-1] = RTA_GET_U8(tb[TCA_DSMARK_VALUE-1]);
10297b99	127
758cc43c TG	128	if (tb[TCA_DSMARK_MASK-1])
	129	p->mask[*arg-1] = mask;
	130
	131	err = 0;
	132
	133	rtattr_failure:
	134	return err;
	135	}
1da177e4	136
af0d1141	137	static int dsmark_delete(struct Qdisc *sch, unsigned long arg)
1da177e4	138	{
81da99ed	139	struct dsmark_qdisc_data *p = qdisc_priv(sch);
1da177e4	140
af0d1141	141	if (!dsmark_valid_index(p, arg))
1da177e4	142	return -EINVAL;
10297b99	143
1da177e4 LT	144	p->mask[arg-1] = 0xff;
1da177e4 LT	145	p->value[arg-1] = 0;
af0d1141	146
1da177e4 LT	147	return 0;
	148	}
	149
1da177e4 LT	150	static void dsmark_walk(struct Qdisc sch,struct qdisc_walker walker)
1da177e4 LT	151	{
81da99ed	152	struct dsmark_qdisc_data *p = qdisc_priv(sch);
1da177e4 LT	153	int i;
1da177e4 LT	154
81da99ed	155	pr_debug("dsmark_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
af0d1141	156
1da177e4 LT	157	if (walker->stop)
1da177e4 LT	158	return;
af0d1141	159
1da177e4 LT	160	for (i = 0; i < p->indices; i++) {
1da177e4 LT	161	if (p->mask[i] == 0xff && !p->value[i])
0451eb07	162	goto ignore;
1da177e4 LT	163	if (walker->count >= walker->skip) {
	164	if (walker->fn(sch, i+1, walker) < 0) {
	165	walker->stop = 1;
	166	break;
	167	}
	168	}
10297b99	169	ignore:
0451eb07	170	walker->count++;
10297b99	171	}
1da177e4 LT	172	}
1da177e4 LT	173
81da99ed	174	static inline struct tcf_proto *dsmark_find_tcf(struct Qdisc sch,unsigned long cl)
1da177e4	175	{
81da99ed SH	176	struct dsmark_qdisc_data *p = qdisc_priv(sch);
81da99ed SH	177	return &p->filter_list;
1da177e4 LT	178	}
1da177e4 LT	179
1da177e4 LT	180	/* --------------------------- Qdisc operations ---------------------------- */
1da177e4 LT	181
1da177e4 LT	182	static int dsmark_enqueue(struct sk_buff skb,struct Qdisc sch)
1da177e4 LT	183	{
81da99ed	184	struct dsmark_qdisc_data *p = qdisc_priv(sch);
af0d1141 TG	185	int err;
af0d1141 TG	186
81da99ed	187	pr_debug("dsmark_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
1da177e4	188
1da177e4	189	if (p->set_tc_index) {
1da177e4 LT	190	switch (skb->protocol) {
1da177e4 LT	191	case __constant_htons(ETH_P_IP):
4c30719f SH	192	if (skb_cow_head(skb, sizeof(struct iphdr)))
	193	goto drop;
	194
eddc9ec5	195	skb->tc_index = ipv4_get_dsfield(ip_hdr(skb))
1da177e4 LT	196	& ~INET_ECN_MASK;
1da177e4 LT	197	break;
4c30719f	198
1da177e4	199	case __constant_htons(ETH_P_IPV6):
4c30719f SH	200	if (skb_cow_head(skb, sizeof(struct ipv6hdr)))
	201	goto drop;
	202
0660e03f	203	skb->tc_index = ipv6_get_dsfield(ipv6_hdr(skb))
1da177e4 LT	204	& ~INET_ECN_MASK;
	205	break;
	206	default:
	207	skb->tc_index = 0;
	208	break;
3ff50b79	209	}
1da177e4	210	}
af0d1141 TG	211
af0d1141 TG	212	if (TC_H_MAJ(skb->priority) == sch->handle)
1da177e4	213	skb->tc_index = TC_H_MIN(skb->priority);
af0d1141 TG	214	else {
	215	struct tcf_result res;
	216	int result = tc_classify(skb, p->filter_list, &res);
	217
81da99ed	218	pr_debug("result %d class 0x%04x\n", result, res.classid);
af0d1141	219
1da177e4	220	switch (result) {
f6853e2d PM	221	#ifdef CONFIG_NET_CLS_ACT
	222	case TC_ACT_QUEUED:
	223	case TC_ACT_STOLEN:
	224	kfree_skb(skb);
	225	return NET_XMIT_SUCCESS;
4c30719f	226
f6853e2d	227	case TC_ACT_SHOT:
4c30719f	228	goto drop;
1da177e4	229	#endif
c3bc7cff	230	case TC_ACT_OK:
f6853e2d PM	231	skb->tc_index = TC_H_MIN(res.classid);
f6853e2d PM	232	break;
4c30719f	233
f6853e2d PM	234	default:
	235	if (p->default_index != NO_DEFAULT_INDEX)
	236	skb->tc_index = p->default_index;
	237	break;
3ff50b79	238	}
1da177e4	239	}
1da177e4	240
af0d1141 TG	241	err = p->q->enqueue(skb,p->q);
af0d1141 TG	242	if (err != NET_XMIT_SUCCESS) {
1da177e4	243	sch->qstats.drops++;
af0d1141	244	return err;
1da177e4	245	}
af0d1141	246
1da177e4 LT	247	sch->bstats.bytes += skb->len;
	248	sch->bstats.packets++;
	249	sch->q.qlen++;
1da177e4	250
af0d1141	251	return NET_XMIT_SUCCESS;
4c30719f SH	252
	253	drop:
	254	kfree_skb(skb);
	255	sch->qstats.drops++;
	256	return NET_XMIT_BYPASS;
af0d1141	257	}
1da177e4 LT	258
	259	static struct sk_buff dsmark_dequeue(struct Qdisc sch)
	260	{
81da99ed	261	struct dsmark_qdisc_data *p = qdisc_priv(sch);
1da177e4	262	struct sk_buff *skb;
af0d1141 TG	263	u32 index;
af0d1141 TG	264
81da99ed	265	pr_debug("dsmark_dequeue(sch %p,[qdisc %p])\n", sch, p);
1da177e4	266
1da177e4	267	skb = p->q->ops->dequeue(p->q);
af0d1141	268	if (skb == NULL)
1da177e4	269	return NULL;
af0d1141	270
1da177e4	271	sch->q.qlen--;
af0d1141 TG	272
af0d1141 TG	273	index = skb->tc_index & (p->indices - 1);
81da99ed	274	pr_debug("index %d->%d\n", skb->tc_index, index);
af0d1141	275
1da177e4 LT	276	switch (skb->protocol) {
1da177e4 LT	277	case __constant_htons(ETH_P_IP):
eddc9ec5	278	ipv4_change_dsfield(ip_hdr(skb), p->mask[index],
af0d1141	279	p->value[index]);
1da177e4 LT	280	break;
1da177e4 LT	281	case __constant_htons(ETH_P_IPV6):
0660e03f	282	ipv6_change_dsfield(ipv6_hdr(skb), p->mask[index],
af0d1141	283	p->value[index]);
1da177e4 LT	284	break;
	285	default:
	286	/*
	287	* Only complain if a change was actually attempted.
	288	* This way, we can send non-IP traffic through dsmark
	289	* and don't need yet another qdisc as a bypass.
	290	*/
	291	if (p->mask[index] != 0xff \|\| p->value[index])
	292	printk(KERN_WARNING "dsmark_dequeue: "
	293	"unsupported protocol %d\n",
66c6f529	294	ntohs(skb->protocol));
1da177e4	295	break;
3ff50b79	296	}
af0d1141	297
1da177e4 LT	298	return skb;
	299	}
	300
1da177e4 LT	301	static int dsmark_requeue(struct sk_buff skb,struct Qdisc sch)
1da177e4 LT	302	{
81da99ed	303	struct dsmark_qdisc_data *p = qdisc_priv(sch);
af0d1141	304	int err;
1da177e4	305
81da99ed	306	pr_debug("dsmark_requeue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
af0d1141 TG	307
	308	err = p->q->ops->requeue(skb, p->q);
	309	if (err != NET_XMIT_SUCCESS) {
	310	sch->qstats.drops++;
	311	return err;
1da177e4	312	}
1da177e4	313
af0d1141 TG	314	sch->q.qlen++;
	315	sch->qstats.requeues++;
	316
	317	return NET_XMIT_SUCCESS;
	318	}
1da177e4 LT	319
	320	static unsigned int dsmark_drop(struct Qdisc *sch)
	321	{
81da99ed	322	struct dsmark_qdisc_data *p = qdisc_priv(sch);
1da177e4	323	unsigned int len;
10297b99	324
81da99ed	325	pr_debug("dsmark_reset(sch %p,[qdisc %p])\n", sch, p);
af0d1141 TG	326
af0d1141 TG	327	if (p->q->ops->drop == NULL)
1da177e4	328	return 0;
af0d1141 TG	329
	330	len = p->q->ops->drop(p->q);
	331	if (len)
	332	sch->q.qlen--;
	333
1da177e4 LT	334	return len;
	335	}
	336
758cc43c	337	static int dsmark_init(struct Qdisc sch, struct rtattr opt)
1da177e4	338	{
81da99ed	339	struct dsmark_qdisc_data *p = qdisc_priv(sch);
1da177e4	340	struct rtattr *tb[TCA_DSMARK_MAX];
758cc43c TG	341	int err = -EINVAL;
	342	u32 default_index = NO_DEFAULT_INDEX;
	343	u16 indices;
	344	u8 *mask;
	345
81da99ed	346	pr_debug("dsmark_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
758cc43c TG	347
	348	if (!opt \|\| rtattr_parse_nested(tb, TCA_DSMARK_MAX, opt) < 0)
	349	goto errout;
	350
	351	indices = RTA_GET_U16(tb[TCA_DSMARK_INDICES-1]);
5b0ac72b DM	352
5b0ac72b DM	353	if (hweight32(indices) != 1)
758cc43c TG	354	goto errout;
	355
	356	if (tb[TCA_DSMARK_DEFAULT_INDEX-1])
	357	default_index = RTA_GET_U16(tb[TCA_DSMARK_DEFAULT_INDEX-1]);
	358
	359	mask = kmalloc(indices * 2, GFP_KERNEL);
	360	if (mask == NULL) {
	361	err = -ENOMEM;
	362	goto errout;
1da177e4	363	}
758cc43c TG	364
	365	p->mask = mask;
	366	memset(p->mask, 0xff, indices);
	367
	368	p->value = p->mask + indices;
	369	memset(p->value, 0, indices);
	370
	371	p->indices = indices;
	372	p->default_index = default_index;
	373	p->set_tc_index = RTA_GET_FLAG(tb[TCA_DSMARK_SET_TC_INDEX-1]);
	374
9f9afec4	375	p->q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, sch->handle);
758cc43c	376	if (p->q == NULL)
1da177e4	377	p->q = &noop_qdisc;
758cc43c	378
81da99ed	379	pr_debug("dsmark_init: qdisc %p\n", p->q);
758cc43c TG	380
	381	err = 0;
	382	errout:
	383	rtattr_failure:
	384	return err;
1da177e4 LT	385	}
1da177e4 LT	386
1da177e4 LT	387	static void dsmark_reset(struct Qdisc *sch)
1da177e4 LT	388	{
81da99ed	389	struct dsmark_qdisc_data *p = qdisc_priv(sch);
1da177e4	390
81da99ed	391	pr_debug("dsmark_reset(sch %p,[qdisc %p])\n", sch, p);
1da177e4 LT	392	qdisc_reset(p->q);
	393	sch->q.qlen = 0;
	394	}
	395
1da177e4 LT	396	static void dsmark_destroy(struct Qdisc *sch)
1da177e4 LT	397	{
81da99ed	398	struct dsmark_qdisc_data *p = qdisc_priv(sch);
1da177e4	399
81da99ed	400	pr_debug("dsmark_destroy(sch %p,[qdisc %p])\n", sch, p);
af0d1141	401
a48b5a61	402	tcf_destroy_chain(p->filter_list);
1da177e4 LT	403	qdisc_destroy(p->q);
	404	kfree(p->mask);
	405	}
	406
1da177e4	407	static int dsmark_dump_class(struct Qdisc *sch, unsigned long cl,
02f23f09	408	struct sk_buff skb, struct tcmsg tcm)
1da177e4	409	{
81da99ed	410	struct dsmark_qdisc_data *p = qdisc_priv(sch);
02f23f09	411	struct rtattr *opts = NULL;
1da177e4	412
81da99ed	413	pr_debug("dsmark_dump_class(sch %p,[qdisc %p],class %ld\n", sch, p, cl);
02f23f09 TG	414
02f23f09 TG	415	if (!dsmark_valid_index(p, cl))
1da177e4	416	return -EINVAL;
02f23f09 TG	417
02f23f09 TG	418	tcm->tcm_handle = TC_H_MAKE(TC_H_MAJ(sch->handle), cl-1);
cdc7f8e3	419	tcm->tcm_info = p->q->handle;
02f23f09 TG	420
	421	opts = RTA_NEST(skb, TCA_OPTIONS);
	422	RTA_PUT_U8(skb,TCA_DSMARK_MASK, p->mask[cl-1]);
	423	RTA_PUT_U8(skb,TCA_DSMARK_VALUE, p->value[cl-1]);
	424
	425	return RTA_NEST_END(skb, opts);
1da177e4 LT	426
1da177e4 LT	427	rtattr_failure:
02f23f09	428	return RTA_NEST_CANCEL(skb, opts);
1da177e4 LT	429	}
	430
	431	static int dsmark_dump(struct Qdisc sch, struct sk_buff skb)
	432	{
81da99ed	433	struct dsmark_qdisc_data *p = qdisc_priv(sch);
02f23f09	434	struct rtattr *opts = NULL;
1da177e4	435
02f23f09 TG	436	opts = RTA_NEST(skb, TCA_OPTIONS);
	437	RTA_PUT_U16(skb, TCA_DSMARK_INDICES, p->indices);
	438
	439	if (p->default_index != NO_DEFAULT_INDEX)
	440	RTA_PUT_U16(skb, TCA_DSMARK_DEFAULT_INDEX, p->default_index);
1da177e4	441
1da177e4	442	if (p->set_tc_index)
02f23f09 TG	443	RTA_PUT_FLAG(skb, TCA_DSMARK_SET_TC_INDEX);
	444
	445	return RTA_NEST_END(skb, opts);
1da177e4 LT	446
1da177e4 LT	447	rtattr_failure:
02f23f09	448	return RTA_NEST_CANCEL(skb, opts);
1da177e4 LT	449	}
1da177e4 LT	450
20fea08b	451	static const struct Qdisc_class_ops dsmark_class_ops = {
1da177e4 LT	452	.graft = dsmark_graft,
	453	.leaf = dsmark_leaf,
	454	.get = dsmark_get,
	455	.put = dsmark_put,
	456	.change = dsmark_change,
	457	.delete = dsmark_delete,
	458	.walk = dsmark_walk,
	459	.tcf_chain = dsmark_find_tcf,
	460	.bind_tcf = dsmark_bind_filter,
	461	.unbind_tcf = dsmark_put,
	462	.dump = dsmark_dump_class,
	463	};
	464
20fea08b	465	static struct Qdisc_ops dsmark_qdisc_ops __read_mostly = {
1da177e4 LT	466	.next = NULL,
	467	.cl_ops = &dsmark_class_ops,
	468	.id = "dsmark",
	469	.priv_size = sizeof(struct dsmark_qdisc_data),
	470	.enqueue = dsmark_enqueue,
	471	.dequeue = dsmark_dequeue,
	472	.requeue = dsmark_requeue,
	473	.drop = dsmark_drop,
	474	.init = dsmark_init,
	475	.reset = dsmark_reset,
	476	.destroy = dsmark_destroy,
	477	.change = NULL,
	478	.dump = dsmark_dump,
	479	.owner = THIS_MODULE,
	480	};
	481
	482	static int __init dsmark_module_init(void)
	483	{
	484	return register_qdisc(&dsmark_qdisc_ops);
	485	}
af0d1141	486
10297b99	487	static void __exit dsmark_module_exit(void)
1da177e4 LT	488	{
	489	unregister_qdisc(&dsmark_qdisc_ops);
	490	}
af0d1141	491
1da177e4 LT	492	module_init(dsmark_module_init)
1da177e4 LT	493	module_exit(dsmark_module_exit)
af0d1141	494
1da177e4	495	MODULE_LICENSE("GPL");