[mirror_ubuntu-hirsute-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 <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_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 = 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) {
		/* 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);

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

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 (!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;

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