[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/config.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h> /* for pkt_sched */
#include <linux/rtnetlink.h>
#include <net/pkt_sched.h>
#include <net/dsfield.h>
#include <net/inet_ecn.h>
#include <asm/byteorder.h>


#if 1 /* control */
#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
#else
#define DPRINTK(format,args...)
#endif

#if 0 /* data */
#define D2PRINTK(format,args...) printk(KERN_DEBUG format,##args)
#else
#define D2PRINTK(format,args...)
#endif


#define PRIV(sch) qdisc_priv(sch)


/*
 * classid	class		marking
 * -------	-----		-------
 *   n/a	  0		n/a
 *   x:0	  1		use entry [0]
 *   ...	 ...		...
 *   x:y y>0	 y+1		use entry [y]
 *   ...	 ...		...
 * x:indices-1	indices		use entry [indices-1]
 *   ...	 ...		...
 *   x:y	 y+1		use entry [y & (indices-1)]
 *   ...	 ...		...
 * 0xffff	0x10000		use entry [indices-1]
 */


#define NO_DEFAULT_INDEX	(1 << 16)

struct dsmark_qdisc_data {
	struct Qdisc		*q;
	struct tcf_proto	*filter_list;
	__u8			*mask;	/* "owns" the array */
	__u8			*value;
	__u16			indices;
	__u32			default_index;	/* index range is 0...0xffff */
	int			set_tc_index;
};


/* ------------------------- 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)
		new = &noop_qdisc;
	sch_tree_lock(sch);
	*old = xchg(&p->q,new);
	if (*old)
		qdisc_reset(*old);
	sch->q.qlen = 0;
	sch_tree_unlock(sch); /* @@@ move up ? */
        return 0;
}


static struct Qdisc *dsmark_leaf(struct Qdisc *sch, unsigned long arg)
{
	struct dsmark_qdisc_data *p = PRIV(sch);

	return p->q;
}


static unsigned long dsmark_get(struct Qdisc *sch,u32 classid)
{
	struct dsmark_qdisc_data *p __attribute__((unused)) = PRIV(sch);

	DPRINTK("dsmark_get(sch %p,[qdisc %p],classid %x)\n",sch,p,classid);
	return TC_H_MIN(classid)+1;
}


static unsigned long dsmark_bind_filter(struct Qdisc *sch,
    unsigned long parent, u32 classid)
{
	return dsmark_get(sch,classid);
}


static void dsmark_put(struct Qdisc *sch, unsigned long cl)
{
}


static int dsmark_change(struct Qdisc *sch, u32 classid, u32 parent,
    struct rtattr **tca, unsigned long *arg)
{
	struct dsmark_qdisc_data *p = PRIV(sch);
	struct rtattr *opt = tca[TCA_OPTIONS-1];
	struct rtattr *tb[TCA_DSMARK_MAX];

	DPRINTK("dsmark_change(sch %p,[qdisc %p],classid %x,parent %x),"
	    "arg 0x%lx\n",sch,p,classid,parent,*arg);
	if (*arg > p->indices)
		return -ENOENT;
	if (!opt || rtattr_parse_nested(tb, TCA_DSMARK_MAX, opt))
		return -EINVAL;
	if (tb[TCA_DSMARK_MASK-1]) {
		if (!RTA_PAYLOAD(tb[TCA_DSMARK_MASK-1]))
			return -EINVAL;
		p->mask[*arg-1] = *(__u8 *) RTA_DATA(tb[TCA_DSMARK_MASK-1]);
	}
	if (tb[TCA_DSMARK_VALUE-1]) {
		if (!RTA_PAYLOAD(tb[TCA_DSMARK_VALUE-1]))
			return -EINVAL;
		p->value[*arg-1] = *(__u8 *) RTA_DATA(tb[TCA_DSMARK_VALUE-1]);
	}
	return 0;
}


static int dsmark_delete(struct Qdisc *sch,unsigned long arg)
{
	struct dsmark_qdisc_data *p = PRIV(sch);

	if (!arg || arg > p->indices)
		return -EINVAL;
	p->mask[arg-1] = 0xff;
	p->value[arg-1] = 0;
	return 0;
}


static void dsmark_walk(struct Qdisc *sch,struct qdisc_walker *walker)
{
	struct dsmark_qdisc_data *p = PRIV(sch);
	int i;

	DPRINTK("dsmark_walk(sch %p,[qdisc %p],walker %p)\n",sch,p,walker);
	if (walker->stop)
		return;
	for (i = 0; i < p->indices; i++) {
		if (p->mask[i] == 0xff && !p->value[i])
			goto ignore;
		if (walker->count >= walker->skip) {
			if (walker->fn(sch, i+1, walker) < 0) {
				walker->stop = 1;
				break;
			}
		}
ignore:		
		walker->count++;
        }
}


static struct tcf_proto **dsmark_find_tcf(struct Qdisc *sch,unsigned long cl)
{
	struct dsmark_qdisc_data *p = PRIV(sch);

	return &p->filter_list;
}


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


static int dsmark_enqueue(struct sk_buff *skb,struct Qdisc *sch)
{
	struct dsmark_qdisc_data *p = PRIV(sch);
	struct tcf_result res;
	int result;
	int ret = NET_XMIT_POLICED;

	D2PRINTK("dsmark_enqueue(skb %p,sch %p,[qdisc %p])\n",skb,sch,p);
	if (p->set_tc_index) {
		/* FIXME: Safe with non-linear skbs? --RR */
		switch (skb->protocol) {
			case __constant_htons(ETH_P_IP):
				skb->tc_index = ipv4_get_dsfield(skb->nh.iph)
					& ~INET_ECN_MASK;
				break;
			case __constant_htons(ETH_P_IPV6):
				skb->tc_index = ipv6_get_dsfield(skb->nh.ipv6h)
					& ~INET_ECN_MASK;
				break;
			default:
				skb->tc_index = 0;
				break;
		};
	}
	result = TC_POLICE_OK; /* be nice to gcc */
	if (TC_H_MAJ(skb->priority) == sch->handle) {
		skb->tc_index = TC_H_MIN(skb->priority);
	} else {
		result = tc_classify(skb,p->filter_list,&res);
		D2PRINTK("result %d class 0x%04x\n",result,res.classid);
		switch (result) {
#ifdef CONFIG_NET_CLS_POLICE
			case TC_POLICE_SHOT:
				kfree_skb(skb);
				break;
#if 0
			case TC_POLICE_RECLASSIFY:
				/* FIXME: what to do here ??? */
#endif
#endif
			case TC_POLICE_OK:
				skb->tc_index = TC_H_MIN(res.classid);
				break;
			case TC_POLICE_UNSPEC:
				/* fall through */
			default:
				if (p->default_index != NO_DEFAULT_INDEX)
					skb->tc_index = p->default_index;
				break;
		};
	}
	if (
#ifdef CONFIG_NET_CLS_POLICE
	    result == TC_POLICE_SHOT ||
#endif

	    ((ret = p->q->enqueue(skb,p->q)) != 0)) {
		sch->qstats.drops++;
		return ret;
	}
	sch->bstats.bytes += skb->len;
	sch->bstats.packets++;
	sch->q.qlen++;
	return ret;
}


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

	D2PRINTK("dsmark_dequeue(sch %p,[qdisc %p])\n",sch,p);
	skb = p->q->ops->dequeue(p->q);
	if (!skb)
		return NULL;
	sch->q.qlen--;
	index = skb->tc_index & (p->indices-1);
	D2PRINTK("index %d->%d\n",skb->tc_index,index);
	switch (skb->protocol) {
		case __constant_htons(ETH_P_IP):
			ipv4_change_dsfield(skb->nh.iph,
			    p->mask[index],p->value[index]);
			break;
		case __constant_htons(ETH_P_IPV6):
			ipv6_change_dsfield(skb->nh.ipv6h,
			    p->mask[index],p->value[index]);
			break;
		default:
			/*
			 * Only complain if a change was actually attempted.
			 * This way, we can send non-IP traffic through dsmark
			 * and don't need yet another qdisc as a bypass.
			 */
			if (p->mask[index] != 0xff || p->value[index])
				printk(KERN_WARNING "dsmark_dequeue: "
				       "unsupported protocol %d\n",
				       htons(skb->protocol));
			break;
	};
	return skb;
}


static int dsmark_requeue(struct sk_buff *skb,struct Qdisc *sch)
{
	int ret;
	struct dsmark_qdisc_data *p = PRIV(sch);

	D2PRINTK("dsmark_requeue(skb %p,sch %p,[qdisc %p])\n",skb,sch,p);
        if ((ret = p->q->ops->requeue(skb, p->q)) == 0) {
		sch->q.qlen++;
		sch->qstats.requeues++;
		return 0;
	}
	sch->qstats.drops++;
	return ret;
}


static unsigned int dsmark_drop(struct Qdisc *sch)
{
	struct dsmark_qdisc_data *p = PRIV(sch);
	unsigned int len;
	
	DPRINTK("dsmark_reset(sch %p,[qdisc %p])\n",sch,p);
	if (!p->q->ops->drop)
		return 0;
	if (!(len = p->q->ops->drop(p->q)))
		return 0;
	sch->q.qlen--;
	return len;
}


static int dsmark_init(struct Qdisc *sch,struct rtattr *opt)
{
	struct dsmark_qdisc_data *p = PRIV(sch);
	struct rtattr *tb[TCA_DSMARK_MAX];
	__u16 tmp;

	DPRINTK("dsmark_init(sch %p,[qdisc %p],opt %p)\n",sch,p,opt);
	if (!opt ||
	    rtattr_parse(tb,TCA_DSMARK_MAX,RTA_DATA(opt),RTA_PAYLOAD(opt)) < 0 ||
	    !tb[TCA_DSMARK_INDICES-1] ||
	    RTA_PAYLOAD(tb[TCA_DSMARK_INDICES-1]) < sizeof(__u16))
                return -EINVAL;
	p->indices = *(__u16 *) RTA_DATA(tb[TCA_DSMARK_INDICES-1]);
	if (!p->indices)
		return -EINVAL;
	for (tmp = p->indices; tmp != 1; tmp >>= 1) {
		if (tmp & 1)
			return -EINVAL;
	}
	p->default_index = NO_DEFAULT_INDEX;
	if (tb[TCA_DSMARK_DEFAULT_INDEX-1]) {
		if (RTA_PAYLOAD(tb[TCA_DSMARK_DEFAULT_INDEX-1]) < sizeof(__u16))
			return -EINVAL;
		p->default_index =
		    *(__u16 *) RTA_DATA(tb[TCA_DSMARK_DEFAULT_INDEX-1]);
	}
	p->set_tc_index = !!tb[TCA_DSMARK_SET_TC_INDEX-1];
	p->mask = kmalloc(p->indices*2,GFP_KERNEL);
	if (!p->mask)
		return -ENOMEM;
	p->value = p->mask+p->indices;
	memset(p->mask,0xff,p->indices);
	memset(p->value,0,p->indices);
	if (!(p->q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops)))
		p->q = &noop_qdisc;
	DPRINTK("dsmark_init: qdisc %p\n",&p->q);
	return 0;
}


static void dsmark_reset(struct Qdisc *sch)
{
	struct dsmark_qdisc_data *p = PRIV(sch);

	DPRINTK("dsmark_reset(sch %p,[qdisc %p])\n",sch,p);
	qdisc_reset(p->q);
	sch->q.qlen = 0;
}


static void dsmark_destroy(struct Qdisc *sch)
{
	struct dsmark_qdisc_data *p = PRIV(sch);
	struct tcf_proto *tp;

	DPRINTK("dsmark_destroy(sch %p,[qdisc %p])\n",sch,p);
	while (p->filter_list) {
		tp = p->filter_list;
		p->filter_list = tp->next;
		tcf_destroy(tp);
	}
	qdisc_destroy(p->q);
	kfree(p->mask);
}


static int dsmark_dump_class(struct Qdisc *sch, unsigned long cl,
    struct sk_buff *skb, struct tcmsg *tcm)
{
	struct dsmark_qdisc_data *p = PRIV(sch);
	unsigned char *b = skb->tail;
	struct rtattr *rta;

	DPRINTK("dsmark_dump_class(sch %p,[qdisc %p],class %ld\n",sch,p,cl);
	if (!cl || cl > p->indices)
		return -EINVAL;
	tcm->tcm_handle = TC_H_MAKE(TC_H_MAJ(sch->handle),cl-1);
	rta = (struct rtattr *) b;
	RTA_PUT(skb,TCA_OPTIONS,0,NULL);
	RTA_PUT(skb,TCA_DSMARK_MASK,1,&p->mask[cl-1]);
	RTA_PUT(skb,TCA_DSMARK_VALUE,1,&p->value[cl-1]);
	rta->rta_len = skb->tail-b;
	return skb->len;

rtattr_failure:
	skb_trim(skb,b-skb->data);
	return -1;
}

static int dsmark_dump(struct Qdisc *sch, struct sk_buff *skb)
{
	struct dsmark_qdisc_data *p = PRIV(sch);
	unsigned char *b = skb->tail;
	struct rtattr *rta;

	rta = (struct rtattr *) b;
	RTA_PUT(skb,TCA_OPTIONS,0,NULL);
	RTA_PUT(skb,TCA_DSMARK_INDICES,sizeof(__u16),&p->indices);
	if (p->default_index != NO_DEFAULT_INDEX) {
		__u16 tmp = p->default_index;

		RTA_PUT(skb,TCA_DSMARK_DEFAULT_INDEX, sizeof(__u16), &tmp);
	}
	if (p->set_tc_index)
		RTA_PUT(skb, TCA_DSMARK_SET_TC_INDEX, 0, NULL);
	rta->rta_len = skb->tail-b;
	return skb->len;

rtattr_failure:
	skb_trim(skb,b-skb->data);
	return -1;
}

static struct Qdisc_class_ops dsmark_class_ops = {
	.graft		=	dsmark_graft,
	.leaf		=	dsmark_leaf,
	.get		=	dsmark_get,
	.put		=	dsmark_put,
	.change		=	dsmark_change,
	.delete		=	dsmark_delete,
	.walk		=	dsmark_walk,
	.tcf_chain	=	dsmark_find_tcf,
	.bind_tcf	=	dsmark_bind_filter,
	.unbind_tcf	=	dsmark_put,
	.dump		=	dsmark_dump_class,
};

static struct Qdisc_ops dsmark_qdisc_ops = {
	.next		=	NULL,
	.cl_ops		=	&dsmark_class_ops,
	.id		=	"dsmark",
	.priv_size	=	sizeof(struct dsmark_qdisc_data),
	.enqueue	=	dsmark_enqueue,
	.dequeue	=	dsmark_dequeue,
	.requeue	=	dsmark_requeue,
	.drop		=	dsmark_drop,
	.init		=	dsmark_init,
	.reset		=	dsmark_reset,
	.destroy	=	dsmark_destroy,
	.change		=	NULL,
	.dump		=	dsmark_dump,
	.owner		=	THIS_MODULE,
};

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