[mirror_ubuntu-artful-kernel.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(qdisc_dev(sch), sch->dev_queue,
					&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 const struct nla_policy dsmark_policy[TCA_DSMARK_MAX + 1] = {
	[TCA_DSMARK_INDICES]		= { .type = NLA_U16 },
	[TCA_DSMARK_DEFAULT_INDEX]	= { .type = NLA_U16 },
	[TCA_DSMARK_SET_TC_INDEX]	= { .type = NLA_FLAG },
	[TCA_DSMARK_MASK]		= { .type = NLA_U8 },
	[TCA_DSMARK_VALUE]		= { .type = NLA_U8 },
};

static int dsmark_change(struct Qdisc *sch, u32 classid, u32 parent,
			 struct nlattr **tca, unsigned long *arg)
{
	struct dsmark_qdisc_data *p = qdisc_priv(sch);
	struct nlattr *opt = tca[TCA_OPTIONS];
	struct nlattr *tb[TCA_DSMARK_MAX + 1];
	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 errout;
	}

	if (!opt)
		goto errout;

	err = nla_parse_nested(tb, TCA_DSMARK_MAX, opt, dsmark_policy);
	if (err < 0)
		goto errout;

	if (tb[TCA_DSMARK_MASK])
		mask = nla_get_u8(tb[TCA_DSMARK_MASK]);

	if (tb[TCA_DSMARK_VALUE])
		p->value[*arg-1] = nla_get_u8(tb[TCA_DSMARK_VALUE]);

	if (tb[TCA_DSMARK_MASK])
		p->mask[*arg-1] = mask;

	err = 0;

errout:
	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 | __NET_XMIT_STOLEN;

		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 = qdisc_enqueue(skb, p->q);
	if (err != NET_XMIT_SUCCESS) {
		if (net_xmit_drop_count(err))
			sch->qstats.drops++;
		return err;
	}

	sch->bstats.bytes += qdisc_pkt_len(skb);
	sch->bstats.packets++;
	sch->q.qlen++;

	return NET_XMIT_SUCCESS;

drop:
	kfree_skb(skb);
	sch->qstats.drops++;
	return NET_XMIT_SUCCESS | __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) {
		if (net_xmit_drop_count(err))
			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 nlattr *opt)
{
	struct dsmark_qdisc_data *p = qdisc_priv(sch);
	struct nlattr *tb[TCA_DSMARK_MAX + 1];
	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)
		goto errout;

	err = nla_parse_nested(tb, TCA_DSMARK_MAX, opt, dsmark_policy);
	if (err < 0)
		goto errout;

	err = -EINVAL;
	indices = nla_get_u16(tb[TCA_DSMARK_INDICES]);

	if (hweight32(indices) != 1)
		goto errout;

	if (tb[TCA_DSMARK_DEFAULT_INDEX])
		default_index = nla_get_u16(tb[TCA_DSMARK_DEFAULT_INDEX]);

	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 = nla_get_flag(tb[TCA_DSMARK_SET_TC_INDEX]);

	p->q = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue,
				 &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:
	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 nlattr *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 = nla_nest_start(skb, TCA_OPTIONS);
	if (opts == NULL)
		goto nla_put_failure;
	NLA_PUT_U8(skb, TCA_DSMARK_MASK, p->mask[cl-1]);
	NLA_PUT_U8(skb, TCA_DSMARK_VALUE, p->value[cl-1]);

	return nla_nest_end(skb, opts);

nla_put_failure:
	nla_nest_cancel(skb, opts);
	return -EMSGSIZE;
}

static int dsmark_dump(struct Qdisc *sch, struct sk_buff *skb)
{
	struct dsmark_qdisc_data *p = qdisc_priv(sch);
	struct nlattr *opts = NULL;

	opts = nla_nest_start(skb, TCA_OPTIONS);
	if (opts == NULL)
		goto nla_put_failure;
	NLA_PUT_U16(skb, TCA_DSMARK_INDICES, p->indices);

	if (p->default_index != NO_DEFAULT_INDEX)
		NLA_PUT_U16(skb, TCA_DSMARK_DEFAULT_INDEX, p->default_index);

	if (p->set_tc_index)
		NLA_PUT_FLAG(skb, TCA_DSMARK_SET_TC_INDEX);

	return nla_nest_end(skb, opts);

nla_put_failure:
	nla_nest_cancel(skb, opts);
	return -EMSGSIZE;
}

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) {
5ce2d488	63	new = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue,
bb949fbd	64	&pfifo_qdisc_ops,
9f9afec4	65	sch->handle);
486b53e5 TG	66	if (new == NULL)
	67	new = &noop_qdisc;
	68	}
	69
1da177e4	70	sch_tree_lock(sch);
af0d1141	71	*old = xchg(&p->q, new);
5e50da01	72	qdisc_tree_decrease_qlen(old, (old)->q.qlen);
af0d1141	73	qdisc_reset(*old);
af0d1141 TG	74	sch_tree_unlock(sch);
af0d1141 TG	75
10297b99	76	return 0;
1da177e4 LT	77	}
1da177e4 LT	78
1da177e4 LT	79	static struct Qdisc dsmark_leaf(struct Qdisc sch, unsigned long arg)
1da177e4 LT	80	{
81da99ed SH	81	struct dsmark_qdisc_data *p = qdisc_priv(sch);
81da99ed SH	82	return p->q;
1da177e4 LT	83	}
1da177e4 LT	84
af0d1141	85	static unsigned long dsmark_get(struct Qdisc *sch, u32 classid)
1da177e4	86	{
81da99ed SH	87	pr_debug("dsmark_get(sch %p,[qdisc %p],classid %x)\n",
81da99ed SH	88	sch, qdisc_priv(sch), classid);
1da177e4	89
af0d1141	90	return TC_H_MIN(classid) + 1;
1da177e4 LT	91	}
1da177e4 LT	92
1da177e4	93	static unsigned long dsmark_bind_filter(struct Qdisc *sch,
af0d1141	94	unsigned long parent, u32 classid)
1da177e4	95	{
af0d1141	96	return dsmark_get(sch, classid);
1da177e4 LT	97	}
1da177e4 LT	98
1da177e4 LT	99	static void dsmark_put(struct Qdisc *sch, unsigned long cl)
	100	{
	101	}
	102
27a3421e PM	103	static const struct nla_policy dsmark_policy[TCA_DSMARK_MAX + 1] = {
	104	[TCA_DSMARK_INDICES] = { .type = NLA_U16 },
	105	[TCA_DSMARK_DEFAULT_INDEX] = { .type = NLA_U16 },
	106	[TCA_DSMARK_SET_TC_INDEX] = { .type = NLA_FLAG },
	107	[TCA_DSMARK_MASK] = { .type = NLA_U8 },
	108	[TCA_DSMARK_VALUE] = { .type = NLA_U8 },
	109	};
	110
1da177e4	111	static int dsmark_change(struct Qdisc *sch, u32 classid, u32 parent,
1e90474c	112	struct nlattr *tca, unsigned long arg)
1da177e4	113	{
81da99ed	114	struct dsmark_qdisc_data *p = qdisc_priv(sch);
1e90474c PM	115	struct nlattr *opt = tca[TCA_OPTIONS];
1e90474c PM	116	struct nlattr *tb[TCA_DSMARK_MAX + 1];
758cc43c TG	117	int err = -EINVAL;
758cc43c TG	118	u8 mask = 0;
1da177e4	119
81da99ed	120	pr_debug("dsmark_change(sch %p,[qdisc %p],classid %x,parent %x),"
758cc43c TG	121	"arg 0x%lx\n", sch, p, classid, parent, *arg);
	122
	123	if (!dsmark_valid_index(p, *arg)) {
	124	err = -ENOENT;
1e90474c	125	goto errout;
1da177e4	126	}
1da177e4	127
cee63723	128	if (!opt)
1e90474c	129	goto errout;
758cc43c	130
27a3421e	131	err = nla_parse_nested(tb, TCA_DSMARK_MAX, opt, dsmark_policy);
cee63723	132	if (err < 0)
27a3421e	133	goto errout;
cee63723	134
27a3421e	135	if (tb[TCA_DSMARK_MASK])
1e90474c	136	mask = nla_get_u8(tb[TCA_DSMARK_MASK]);
27a3421e PM	137
27a3421e PM	138	if (tb[TCA_DSMARK_VALUE])
1e90474c	139	p->value[*arg-1] = nla_get_u8(tb[TCA_DSMARK_VALUE]);
10297b99	140
1e90474c	141	if (tb[TCA_DSMARK_MASK])
758cc43c TG	142	p->mask[*arg-1] = mask;
	143
	144	err = 0;
	145
1e90474c	146	errout:
758cc43c TG	147	return err;
758cc43c TG	148	}
1da177e4	149
af0d1141	150	static int dsmark_delete(struct Qdisc *sch, unsigned long arg)
1da177e4	151	{
81da99ed	152	struct dsmark_qdisc_data *p = qdisc_priv(sch);
1da177e4	153
af0d1141	154	if (!dsmark_valid_index(p, arg))
1da177e4	155	return -EINVAL;
10297b99	156
1da177e4 LT	157	p->mask[arg-1] = 0xff;
1da177e4 LT	158	p->value[arg-1] = 0;
af0d1141	159
1da177e4 LT	160	return 0;
	161	}
	162
9d127fbd	163	static void dsmark_walk(struct Qdisc sch, struct qdisc_walker walker)
1da177e4	164	{
81da99ed	165	struct dsmark_qdisc_data *p = qdisc_priv(sch);
1da177e4 LT	166	int i;
1da177e4 LT	167
81da99ed	168	pr_debug("dsmark_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
af0d1141	169
1da177e4 LT	170	if (walker->stop)
1da177e4 LT	171	return;
af0d1141	172
1da177e4 LT	173	for (i = 0; i < p->indices; i++) {
1da177e4 LT	174	if (p->mask[i] == 0xff && !p->value[i])
0451eb07	175	goto ignore;
1da177e4 LT	176	if (walker->count >= walker->skip) {
	177	if (walker->fn(sch, i+1, walker) < 0) {
	178	walker->stop = 1;
	179	break;
	180	}
	181	}
10297b99	182	ignore:
0451eb07	183	walker->count++;
10297b99	184	}
1da177e4 LT	185	}
1da177e4 LT	186
9d127fbd SH	187	static inline struct tcf_proto *dsmark_find_tcf(struct Qdisc sch,
9d127fbd SH	188	unsigned long cl)
1da177e4	189	{
81da99ed SH	190	struct dsmark_qdisc_data *p = qdisc_priv(sch);
81da99ed SH	191	return &p->filter_list;
1da177e4 LT	192	}
1da177e4 LT	193
1da177e4 LT	194	/* --------------------------- Qdisc operations ---------------------------- */
1da177e4 LT	195
9d127fbd	196	static int dsmark_enqueue(struct sk_buff skb, struct Qdisc sch)
1da177e4	197	{
81da99ed	198	struct dsmark_qdisc_data *p = qdisc_priv(sch);
af0d1141 TG	199	int err;
af0d1141 TG	200
81da99ed	201	pr_debug("dsmark_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
1da177e4	202
1da177e4	203	if (p->set_tc_index) {
1da177e4	204	switch (skb->protocol) {
9d127fbd SH	205	case __constant_htons(ETH_P_IP):
	206	if (skb_cow_head(skb, sizeof(struct iphdr)))
	207	goto drop;
4c30719f	208
9d127fbd SH	209	skb->tc_index = ipv4_get_dsfield(ip_hdr(skb))
	210	& ~INET_ECN_MASK;
	211	break;
4c30719f	212
9d127fbd SH	213	case __constant_htons(ETH_P_IPV6):
	214	if (skb_cow_head(skb, sizeof(struct ipv6hdr)))
	215	goto drop;
4c30719f	216
9d127fbd SH	217	skb->tc_index = ipv6_get_dsfield(ipv6_hdr(skb))
	218	& ~INET_ECN_MASK;
	219	break;
	220	default:
	221	skb->tc_index = 0;
	222	break;
3ff50b79	223	}
1da177e4	224	}
af0d1141 TG	225
af0d1141 TG	226	if (TC_H_MAJ(skb->priority) == sch->handle)
1da177e4	227	skb->tc_index = TC_H_MIN(skb->priority);
af0d1141 TG	228	else {
	229	struct tcf_result res;
	230	int result = tc_classify(skb, p->filter_list, &res);
	231
81da99ed	232	pr_debug("result %d class 0x%04x\n", result, res.classid);
af0d1141	233
1da177e4	234	switch (result) {
f6853e2d PM	235	#ifdef CONFIG_NET_CLS_ACT
	236	case TC_ACT_QUEUED:
	237	case TC_ACT_STOLEN:
	238	kfree_skb(skb);
378a2f09	239	return NET_XMIT_SUCCESS \| __NET_XMIT_STOLEN;
4c30719f	240
f6853e2d	241	case TC_ACT_SHOT:
4c30719f	242	goto drop;
1da177e4	243	#endif
c3bc7cff	244	case TC_ACT_OK:
f6853e2d PM	245	skb->tc_index = TC_H_MIN(res.classid);
f6853e2d PM	246	break;
4c30719f	247
f6853e2d PM	248	default:
	249	if (p->default_index != NO_DEFAULT_INDEX)
	250	skb->tc_index = p->default_index;
	251	break;
3ff50b79	252	}
1da177e4	253	}
1da177e4	254
5f86173b	255	err = qdisc_enqueue(skb, p->q);
af0d1141	256	if (err != NET_XMIT_SUCCESS) {
378a2f09 JP	257	if (net_xmit_drop_count(err))
378a2f09 JP	258	sch->qstats.drops++;
af0d1141	259	return err;
1da177e4	260	}
af0d1141	261
0abf77e5	262	sch->bstats.bytes += qdisc_pkt_len(skb);
1da177e4 LT	263	sch->bstats.packets++;
1da177e4 LT	264	sch->q.qlen++;
1da177e4	265
af0d1141	266	return NET_XMIT_SUCCESS;
4c30719f SH	267
	268	drop:
	269	kfree_skb(skb);
	270	sch->qstats.drops++;
c27f339a	271	return NET_XMIT_SUCCESS \| __NET_XMIT_BYPASS;
af0d1141	272	}
1da177e4 LT	273
	274	static struct sk_buff dsmark_dequeue(struct Qdisc sch)
	275	{
81da99ed	276	struct dsmark_qdisc_data *p = qdisc_priv(sch);
1da177e4	277	struct sk_buff *skb;
af0d1141 TG	278	u32 index;
af0d1141 TG	279
81da99ed	280	pr_debug("dsmark_dequeue(sch %p,[qdisc %p])\n", sch, p);
1da177e4	281
1da177e4	282	skb = p->q->ops->dequeue(p->q);
af0d1141	283	if (skb == NULL)
1da177e4	284	return NULL;
af0d1141	285
1da177e4	286	sch->q.qlen--;
af0d1141 TG	287
af0d1141 TG	288	index = skb->tc_index & (p->indices - 1);
81da99ed	289	pr_debug("index %d->%d\n", skb->tc_index, index);
af0d1141	290
1da177e4	291	switch (skb->protocol) {
9d127fbd SH	292	case __constant_htons(ETH_P_IP):
	293	ipv4_change_dsfield(ip_hdr(skb), p->mask[index],
	294	p->value[index]);
1da177e4	295	break;
9d127fbd SH	296	case __constant_htons(ETH_P_IPV6):
	297	ipv6_change_dsfield(ipv6_hdr(skb), p->mask[index],
	298	p->value[index]);
1da177e4	299	break;
9d127fbd SH	300	default:
	301	/*
	302	* Only complain if a change was actually attempted.
	303	* This way, we can send non-IP traffic through dsmark
	304	* and don't need yet another qdisc as a bypass.
	305	*/
	306	if (p->mask[index] != 0xff \|\| p->value[index])
	307	printk(KERN_WARNING
	308	"dsmark_dequeue: unsupported protocol %d\n",
	309	ntohs(skb->protocol));
	310	break;
3ff50b79	311	}
af0d1141	312
1da177e4 LT	313	return skb;
	314	}
	315
9d127fbd	316	static int dsmark_requeue(struct sk_buff skb, struct Qdisc sch)
1da177e4	317	{
81da99ed	318	struct dsmark_qdisc_data *p = qdisc_priv(sch);
af0d1141	319	int err;
1da177e4	320
81da99ed	321	pr_debug("dsmark_requeue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
af0d1141 TG	322
	323	err = p->q->ops->requeue(skb, p->q);
	324	if (err != NET_XMIT_SUCCESS) {
378a2f09 JP	325	if (net_xmit_drop_count(err))
378a2f09 JP	326	sch->qstats.drops++;
af0d1141	327	return err;
1da177e4	328	}
1da177e4	329
af0d1141 TG	330	sch->q.qlen++;
	331	sch->qstats.requeues++;
	332
	333	return NET_XMIT_SUCCESS;
	334	}
1da177e4 LT	335
	336	static unsigned int dsmark_drop(struct Qdisc *sch)
	337	{
81da99ed	338	struct dsmark_qdisc_data *p = qdisc_priv(sch);
1da177e4	339	unsigned int len;
10297b99	340
81da99ed	341	pr_debug("dsmark_reset(sch %p,[qdisc %p])\n", sch, p);
af0d1141 TG	342
af0d1141 TG	343	if (p->q->ops->drop == NULL)
1da177e4	344	return 0;
af0d1141 TG	345
	346	len = p->q->ops->drop(p->q);
	347	if (len)
	348	sch->q.qlen--;
	349
1da177e4 LT	350	return len;
	351	}
	352
1e90474c	353	static int dsmark_init(struct Qdisc sch, struct nlattr opt)
1da177e4	354	{
81da99ed	355	struct dsmark_qdisc_data *p = qdisc_priv(sch);
1e90474c	356	struct nlattr *tb[TCA_DSMARK_MAX + 1];
758cc43c TG	357	int err = -EINVAL;
	358	u32 default_index = NO_DEFAULT_INDEX;
	359	u16 indices;
	360	u8 *mask;
	361
81da99ed	362	pr_debug("dsmark_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
758cc43c	363
cee63723 PM	364	if (!opt)
	365	goto errout;
	366
27a3421e	367	err = nla_parse_nested(tb, TCA_DSMARK_MAX, opt, dsmark_policy);
cee63723	368	if (err < 0)
758cc43c TG	369	goto errout;
758cc43c TG	370
cee63723	371	err = -EINVAL;
1e90474c	372	indices = nla_get_u16(tb[TCA_DSMARK_INDICES]);
5b0ac72b DM	373
5b0ac72b DM	374	if (hweight32(indices) != 1)
758cc43c TG	375	goto errout;
758cc43c TG	376
27a3421e	377	if (tb[TCA_DSMARK_DEFAULT_INDEX])
1e90474c	378	default_index = nla_get_u16(tb[TCA_DSMARK_DEFAULT_INDEX]);
758cc43c TG	379
	380	mask = kmalloc(indices * 2, GFP_KERNEL);
	381	if (mask == NULL) {
	382	err = -ENOMEM;
	383	goto errout;
1da177e4	384	}
758cc43c TG	385
	386	p->mask = mask;
	387	memset(p->mask, 0xff, indices);
	388
	389	p->value = p->mask + indices;
	390	memset(p->value, 0, indices);
	391
	392	p->indices = indices;
	393	p->default_index = default_index;
1e90474c	394	p->set_tc_index = nla_get_flag(tb[TCA_DSMARK_SET_TC_INDEX]);
758cc43c	395
5ce2d488	396	p->q = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue,
bb949fbd	397	&pfifo_qdisc_ops, sch->handle);
758cc43c	398	if (p->q == NULL)
1da177e4	399	p->q = &noop_qdisc;
758cc43c	400
81da99ed	401	pr_debug("dsmark_init: qdisc %p\n", p->q);
758cc43c TG	402
	403	err = 0;
	404	errout:
758cc43c	405	return err;
1da177e4 LT	406	}
1da177e4 LT	407
1da177e4 LT	408	static void dsmark_reset(struct Qdisc *sch)
1da177e4 LT	409	{
81da99ed	410	struct dsmark_qdisc_data *p = qdisc_priv(sch);
1da177e4	411
81da99ed	412	pr_debug("dsmark_reset(sch %p,[qdisc %p])\n", sch, p);
1da177e4 LT	413	qdisc_reset(p->q);
	414	sch->q.qlen = 0;
	415	}
	416
1da177e4 LT	417	static void dsmark_destroy(struct Qdisc *sch)
1da177e4 LT	418	{
81da99ed	419	struct dsmark_qdisc_data *p = qdisc_priv(sch);
1da177e4	420
81da99ed	421	pr_debug("dsmark_destroy(sch %p,[qdisc %p])\n", sch, p);
af0d1141	422
ff31ab56	423	tcf_destroy_chain(&p->filter_list);
1da177e4 LT	424	qdisc_destroy(p->q);
	425	kfree(p->mask);
	426	}
	427
1da177e4	428	static int dsmark_dump_class(struct Qdisc *sch, unsigned long cl,
02f23f09	429	struct sk_buff skb, struct tcmsg tcm)
1da177e4	430	{
81da99ed	431	struct dsmark_qdisc_data *p = qdisc_priv(sch);
1e90474c	432	struct nlattr *opts = NULL;
1da177e4	433
81da99ed	434	pr_debug("dsmark_dump_class(sch %p,[qdisc %p],class %ld\n", sch, p, cl);
02f23f09 TG	435
02f23f09 TG	436	if (!dsmark_valid_index(p, cl))
1da177e4	437	return -EINVAL;
02f23f09 TG	438
02f23f09 TG	439	tcm->tcm_handle = TC_H_MAKE(TC_H_MAJ(sch->handle), cl-1);
cdc7f8e3	440	tcm->tcm_info = p->q->handle;
02f23f09	441
1e90474c PM	442	opts = nla_nest_start(skb, TCA_OPTIONS);
	443	if (opts == NULL)
	444	goto nla_put_failure;
	445	NLA_PUT_U8(skb, TCA_DSMARK_MASK, p->mask[cl-1]);
	446	NLA_PUT_U8(skb, TCA_DSMARK_VALUE, p->value[cl-1]);
02f23f09	447
1e90474c	448	return nla_nest_end(skb, opts);
1da177e4	449
1e90474c	450	nla_put_failure:
bc3ed28c TG	451	nla_nest_cancel(skb, opts);
bc3ed28c TG	452	return -EMSGSIZE;
1da177e4 LT	453	}
	454
	455	static int dsmark_dump(struct Qdisc sch, struct sk_buff skb)
	456	{
81da99ed	457	struct dsmark_qdisc_data *p = qdisc_priv(sch);
1e90474c	458	struct nlattr *opts = NULL;
1da177e4	459
1e90474c PM	460	opts = nla_nest_start(skb, TCA_OPTIONS);
	461	if (opts == NULL)
	462	goto nla_put_failure;
	463	NLA_PUT_U16(skb, TCA_DSMARK_INDICES, p->indices);
02f23f09 TG	464
02f23f09 TG	465	if (p->default_index != NO_DEFAULT_INDEX)
1e90474c	466	NLA_PUT_U16(skb, TCA_DSMARK_DEFAULT_INDEX, p->default_index);
1da177e4	467
1da177e4	468	if (p->set_tc_index)
1e90474c	469	NLA_PUT_FLAG(skb, TCA_DSMARK_SET_TC_INDEX);
02f23f09	470
1e90474c	471	return nla_nest_end(skb, opts);
1da177e4	472
1e90474c	473	nla_put_failure:
bc3ed28c TG	474	nla_nest_cancel(skb, opts);
bc3ed28c TG	475	return -EMSGSIZE;
1da177e4 LT	476	}
1da177e4 LT	477
20fea08b	478	static const struct Qdisc_class_ops dsmark_class_ops = {
1da177e4 LT	479	.graft = dsmark_graft,
	480	.leaf = dsmark_leaf,
	481	.get = dsmark_get,
	482	.put = dsmark_put,
	483	.change = dsmark_change,
	484	.delete = dsmark_delete,
	485	.walk = dsmark_walk,
	486	.tcf_chain = dsmark_find_tcf,
	487	.bind_tcf = dsmark_bind_filter,
	488	.unbind_tcf = dsmark_put,
	489	.dump = dsmark_dump_class,
	490	};
	491
20fea08b	492	static struct Qdisc_ops dsmark_qdisc_ops __read_mostly = {
1da177e4 LT	493	.next = NULL,
	494	.cl_ops = &dsmark_class_ops,
	495	.id = "dsmark",
	496	.priv_size = sizeof(struct dsmark_qdisc_data),
	497	.enqueue = dsmark_enqueue,
	498	.dequeue = dsmark_dequeue,
	499	.requeue = dsmark_requeue,
	500	.drop = dsmark_drop,
	501	.init = dsmark_init,
	502	.reset = dsmark_reset,
	503	.destroy = dsmark_destroy,
	504	.change = NULL,
	505	.dump = dsmark_dump,
	506	.owner = THIS_MODULE,
	507	};
	508
	509	static int __init dsmark_module_init(void)
	510	{
	511	return register_qdisc(&dsmark_qdisc_ops);
	512	}
af0d1141	513
10297b99	514	static void __exit dsmark_module_exit(void)
1da177e4 LT	515	{
	516	unregister_qdisc(&dsmark_qdisc_ops);
	517	}
af0d1141	518
1da177e4 LT	519	module_init(dsmark_module_init)
1da177e4 LT	520	module_exit(dsmark_module_exit)
af0d1141	521
1da177e4	522	MODULE_LICENSE("GPL");