[deliverable/linux.git] / net / sched / cls_tcindex.c

/*
 * net/sched/cls_tcindex.c	Packet classifier for skb->tc_index
 *
 * Written 1998,1999 by Werner Almesberger, EPFL ICA
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <net/ip.h>
#include <net/act_api.h>
#include <net/pkt_cls.h>
#include <net/route.h>


/*
 * Not quite sure if we need all the xchgs Alexey uses when accessing things.
 * Can always add them later ... :)
 */

/*
 * Passing parameters to the root seems to be done more awkwardly than really
 * necessary. At least, u32 doesn't seem to use such dirty hacks. To be
 * verified. FIXME.
 */

#define PERFECT_HASH_THRESHOLD	64	/* use perfect hash if not bigger */
#define DEFAULT_HASH_SIZE	64	/* optimized for diffserv */


#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(tp)	((struct tcindex_data *) (tp)->root)


struct tcindex_filter_result {
	struct tcf_exts		exts;
	struct tcf_result	res;
};

struct tcindex_filter {
	u16 key;
	struct tcindex_filter_result result;
	struct tcindex_filter *next;
};


struct tcindex_data {
	struct tcindex_filter_result *perfect; /* perfect hash; NULL if none */
	struct tcindex_filter **h; /* imperfect hash; only used if !perfect;
				      NULL if unused */
	u16 mask;		/* AND key with mask */
	int shift;		/* shift ANDed key to the right */
	int hash;		/* hash table size; 0 if undefined */
	int alloc_hash;		/* allocated size */
	int fall_through;	/* 0: only classify if explicit match */
};

static struct tcf_ext_map tcindex_ext_map = {
	.police = TCA_TCINDEX_POLICE,
	.action = TCA_TCINDEX_ACT
};

static inline int
tcindex_filter_is_set(struct tcindex_filter_result *r)
{
	return tcf_exts_is_predicative(&r->exts) || r->res.classid;
}

static struct tcindex_filter_result *
tcindex_lookup(struct tcindex_data *p, u16 key)
{
	struct tcindex_filter *f;

	if (p->perfect)
		return tcindex_filter_is_set(p->perfect + key) ?
			p->perfect + key : NULL;
	else if (p->h) {
		for (f = p->h[key % p->hash]; f; f = f->next)
			if (f->key == key)
				return &f->result;
	}

	return NULL;
}


static int tcindex_classify(struct sk_buff *skb, struct tcf_proto *tp,
			    struct tcf_result *res)
{
	struct tcindex_data *p = PRIV(tp);
	struct tcindex_filter_result *f;
	int key = (skb->tc_index & p->mask) >> p->shift;

	D2PRINTK("tcindex_classify(skb %p,tp %p,res %p),p %p\n",skb,tp,res,p);

	f = tcindex_lookup(p, key);
	if (!f) {
		if (!p->fall_through)
			return -1;
		res->classid = TC_H_MAKE(TC_H_MAJ(tp->q->handle), key);
		res->class = 0;
		D2PRINTK("alg 0x%x\n",res->classid);
		return 0;
	}
	*res = f->res;
	D2PRINTK("map 0x%x\n",res->classid);

	return tcf_exts_exec(skb, &f->exts, res);
}


static unsigned long tcindex_get(struct tcf_proto *tp, u32 handle)
{
	struct tcindex_data *p = PRIV(tp);
	struct tcindex_filter_result *r;

	DPRINTK("tcindex_get(tp %p,handle 0x%08x)\n",tp,handle);
	if (p->perfect && handle >= p->alloc_hash)
		return 0;
	r = tcindex_lookup(p, handle);
	return r && tcindex_filter_is_set(r) ? (unsigned long) r : 0UL;
}


static void tcindex_put(struct tcf_proto *tp, unsigned long f)
{
	DPRINTK("tcindex_put(tp %p,f 0x%lx)\n",tp,f);
}


static int tcindex_init(struct tcf_proto *tp)
{
	struct tcindex_data *p;

	DPRINTK("tcindex_init(tp %p)\n",tp);
	p = kzalloc(sizeof(struct tcindex_data),GFP_KERNEL);
	if (!p)
		return -ENOMEM;

	p->mask = 0xffff;
	p->hash = DEFAULT_HASH_SIZE;
	p->fall_through = 1;

	tp->root = p;
	return 0;
}


static int
__tcindex_delete(struct tcf_proto *tp, unsigned long arg, int lock)
{
	struct tcindex_data *p = PRIV(tp);
	struct tcindex_filter_result *r = (struct tcindex_filter_result *) arg;
	struct tcindex_filter *f = NULL;

	DPRINTK("tcindex_delete(tp %p,arg 0x%lx),p %p,f %p\n",tp,arg,p,f);
	if (p->perfect) {
		if (!r->res.class)
			return -ENOENT;
	} else {
		int i;
		struct tcindex_filter **walk = NULL;

		for (i = 0; i < p->hash; i++)
			for (walk = p->h+i; *walk; walk = &(*walk)->next)
				if (&(*walk)->result == r)
					goto found;
		return -ENOENT;

found:
		f = *walk;
		if (lock)
			tcf_tree_lock(tp);
		*walk = f->next;
		if (lock)
			tcf_tree_unlock(tp);
	}
	tcf_unbind_filter(tp, &r->res);
	tcf_exts_destroy(tp, &r->exts);
	kfree(f);
	return 0;
}

static int tcindex_delete(struct tcf_proto *tp, unsigned long arg)
{
	return __tcindex_delete(tp, arg, 1);
}

static inline int
valid_perfect_hash(struct tcindex_data *p)
{
	return  p->hash > (p->mask >> p->shift);
}

static int
tcindex_set_parms(struct tcf_proto *tp, unsigned long base, u32 handle,
		  struct tcindex_data *p, struct tcindex_filter_result *r,
		  struct rtattr **tb, struct rtattr *est)
{
	int err, balloc = 0;
	struct tcindex_filter_result new_filter_result, *old_r = r;
	struct tcindex_filter_result cr;
	struct tcindex_data cp;
	struct tcindex_filter *f = NULL; /* make gcc behave */
	struct tcf_exts e;

	err = tcf_exts_validate(tp, tb, est, &e, &tcindex_ext_map);
	if (err < 0)
		return err;

	memcpy(&cp, p, sizeof(cp));
	memset(&new_filter_result, 0, sizeof(new_filter_result));

	if (old_r)
		memcpy(&cr, r, sizeof(cr));
	else
		memset(&cr, 0, sizeof(cr));

	err = -EINVAL;
	if (tb[TCA_TCINDEX_HASH-1]) {
		if (RTA_PAYLOAD(tb[TCA_TCINDEX_HASH-1]) < sizeof(u32))
			goto errout;
		cp.hash = *(u32 *) RTA_DATA(tb[TCA_TCINDEX_HASH-1]);
	}

	if (tb[TCA_TCINDEX_MASK-1]) {
		if (RTA_PAYLOAD(tb[TCA_TCINDEX_MASK-1]) < sizeof(u16))
			goto errout;
		cp.mask = *(u16 *) RTA_DATA(tb[TCA_TCINDEX_MASK-1]);
	}

	if (tb[TCA_TCINDEX_SHIFT-1]) {
		if (RTA_PAYLOAD(tb[TCA_TCINDEX_SHIFT-1]) < sizeof(int))
			goto errout;
		cp.shift = *(int *) RTA_DATA(tb[TCA_TCINDEX_SHIFT-1]);
	}

	err = -EBUSY;
	/* Hash already allocated, make sure that we still meet the
	 * requirements for the allocated hash.
	 */
	if (cp.perfect) {
		if (!valid_perfect_hash(&cp) ||
		    cp.hash > cp.alloc_hash)
			goto errout;
	} else if (cp.h && cp.hash != cp.alloc_hash)
		goto errout;

	err = -EINVAL;
	if (tb[TCA_TCINDEX_FALL_THROUGH-1]) {
		if (RTA_PAYLOAD(tb[TCA_TCINDEX_FALL_THROUGH-1]) < sizeof(u32))
			goto errout;
		cp.fall_through =
			*(u32 *) RTA_DATA(tb[TCA_TCINDEX_FALL_THROUGH-1]);
	}

	if (!cp.hash) {
		/* Hash not specified, use perfect hash if the upper limit
		 * of the hashing index is below the threshold.
		 */
		if ((cp.mask >> cp.shift) < PERFECT_HASH_THRESHOLD)
			cp.hash = (cp.mask >> cp.shift)+1;
		else
			cp.hash = DEFAULT_HASH_SIZE;
	}

	if (!cp.perfect && !cp.h)
		cp.alloc_hash = cp.hash;

	/* Note: this could be as restrictive as if (handle & ~(mask >> shift))
	 * but then, we'd fail handles that may become valid after some future
	 * mask change. While this is extremely unlikely to ever matter,
	 * the check below is safer (and also more backwards-compatible).
	 */
	if (cp.perfect || valid_perfect_hash(&cp))
		if (handle >= cp.alloc_hash)
			goto errout;


	err = -ENOMEM;
	if (!cp.perfect && !cp.h) {
		if (valid_perfect_hash(&cp)) {
			cp.perfect = kcalloc(cp.hash, sizeof(*r), GFP_KERNEL);
			if (!cp.perfect)
				goto errout;
			balloc = 1;
		} else {
			cp.h = kcalloc(cp.hash, sizeof(f), GFP_KERNEL);
			if (!cp.h)
				goto errout;
			balloc = 2;
		}
	}

	if (cp.perfect)
		r = cp.perfect + handle;
	else
		r = tcindex_lookup(&cp, handle) ? : &new_filter_result;

	if (r == &new_filter_result) {
		f = kzalloc(sizeof(*f), GFP_KERNEL);
		if (!f)
			goto errout_alloc;
	}

	if (tb[TCA_TCINDEX_CLASSID-1]) {
		cr.res.classid = *(u32 *) RTA_DATA(tb[TCA_TCINDEX_CLASSID-1]);
		tcf_bind_filter(tp, &cr.res, base);
	}

	tcf_exts_change(tp, &cr.exts, &e);

	tcf_tree_lock(tp);
	if (old_r && old_r != r)
		memset(old_r, 0, sizeof(*old_r));

	memcpy(p, &cp, sizeof(cp));
	memcpy(r, &cr, sizeof(cr));

	if (r == &new_filter_result) {
		struct tcindex_filter **fp;

		f->key = handle;
		f->result = new_filter_result;
		f->next = NULL;
		for (fp = p->h+(handle % p->hash); *fp; fp = &(*fp)->next)
			/* nothing */;
		*fp = f;
	}
	tcf_tree_unlock(tp);

	return 0;

errout_alloc:
	if (balloc == 1)
		kfree(cp.perfect);
	else if (balloc == 2)
		kfree(cp.h);
errout:
	tcf_exts_destroy(tp, &e);
	return err;
}

static int
tcindex_change(struct tcf_proto *tp, unsigned long base, u32 handle,
	       struct rtattr **tca, unsigned long *arg)
{
	struct rtattr *opt = tca[TCA_OPTIONS-1];
	struct rtattr *tb[TCA_TCINDEX_MAX];
	struct tcindex_data *p = PRIV(tp);
	struct tcindex_filter_result *r = (struct tcindex_filter_result *) *arg;

	DPRINTK("tcindex_change(tp %p,handle 0x%08x,tca %p,arg %p),opt %p,"
	    "p %p,r %p,*arg 0x%lx\n",
	    tp, handle, tca, arg, opt, p, r, arg ? *arg : 0L);

	if (!opt)
		return 0;

	if (rtattr_parse_nested(tb, TCA_TCINDEX_MAX, opt) < 0)
		return -EINVAL;

	return tcindex_set_parms(tp, base, handle, p, r, tb, tca[TCA_RATE-1]);
}


static void tcindex_walk(struct tcf_proto *tp, struct tcf_walker *walker)
{
	struct tcindex_data *p = PRIV(tp);
	struct tcindex_filter *f,*next;
	int i;

	DPRINTK("tcindex_walk(tp %p,walker %p),p %p\n",tp,walker,p);
	if (p->perfect) {
		for (i = 0; i < p->hash; i++) {
			if (!p->perfect[i].res.class)
				continue;
			if (walker->count >= walker->skip) {
				if (walker->fn(tp,
				    (unsigned long) (p->perfect+i), walker)
				     < 0) {
					walker->stop = 1;
					return;
				}
			}
			walker->count++;
		}
	}
	if (!p->h)
		return;
	for (i = 0; i < p->hash; i++) {
		for (f = p->h[i]; f; f = next) {
			next = f->next;
			if (walker->count >= walker->skip) {
				if (walker->fn(tp,(unsigned long) &f->result,
				    walker) < 0) {
					walker->stop = 1;
					return;
				}
			}
			walker->count++;
		}
	}
}


static int tcindex_destroy_element(struct tcf_proto *tp,
    unsigned long arg, struct tcf_walker *walker)
{
	return __tcindex_delete(tp, arg, 0);
}


static void tcindex_destroy(struct tcf_proto *tp)
{
	struct tcindex_data *p = PRIV(tp);
	struct tcf_walker walker;

	DPRINTK("tcindex_destroy(tp %p),p %p\n",tp,p);
	walker.count = 0;
	walker.skip = 0;
	walker.fn = &tcindex_destroy_element;
	tcindex_walk(tp,&walker);
	kfree(p->perfect);
	kfree(p->h);
	kfree(p);
	tp->root = NULL;
}


static int tcindex_dump(struct tcf_proto *tp, unsigned long fh,
    struct sk_buff *skb, struct tcmsg *t)
{
	struct tcindex_data *p = PRIV(tp);
	struct tcindex_filter_result *r = (struct tcindex_filter_result *) fh;
	unsigned char *b = skb_tail_pointer(skb);
	struct rtattr *rta;

	DPRINTK("tcindex_dump(tp %p,fh 0x%lx,skb %p,t %p),p %p,r %p,b %p\n",
	    tp,fh,skb,t,p,r,b);
	DPRINTK("p->perfect %p p->h %p\n",p->perfect,p->h);
	rta = (struct rtattr *) b;
	RTA_PUT(skb,TCA_OPTIONS,0,NULL);
	if (!fh) {
		t->tcm_handle = ~0; /* whatever ... */
		RTA_PUT(skb,TCA_TCINDEX_HASH,sizeof(p->hash),&p->hash);
		RTA_PUT(skb,TCA_TCINDEX_MASK,sizeof(p->mask),&p->mask);
		RTA_PUT(skb,TCA_TCINDEX_SHIFT,sizeof(p->shift),&p->shift);
		RTA_PUT(skb,TCA_TCINDEX_FALL_THROUGH,sizeof(p->fall_through),
		    &p->fall_through);
		rta->rta_len = skb_tail_pointer(skb) - b;
	} else {
		if (p->perfect) {
			t->tcm_handle = r-p->perfect;
		} else {
			struct tcindex_filter *f;
			int i;

			t->tcm_handle = 0;
			for (i = 0; !t->tcm_handle && i < p->hash; i++) {
				for (f = p->h[i]; !t->tcm_handle && f;
				     f = f->next) {
					if (&f->result == r)
						t->tcm_handle = f->key;
				}
			}
		}
		DPRINTK("handle = %d\n",t->tcm_handle);
		if (r->res.class)
			RTA_PUT(skb, TCA_TCINDEX_CLASSID, 4, &r->res.classid);

		if (tcf_exts_dump(skb, &r->exts, &tcindex_ext_map) < 0)
			goto rtattr_failure;
		rta->rta_len = skb_tail_pointer(skb) - b;

		if (tcf_exts_dump_stats(skb, &r->exts, &tcindex_ext_map) < 0)
			goto rtattr_failure;
	}

	return skb->len;

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

static struct tcf_proto_ops cls_tcindex_ops = {
	.next		=	NULL,
	.kind		=	"tcindex",
	.classify	=	tcindex_classify,
	.init		=	tcindex_init,
	.destroy	=	tcindex_destroy,
	.get		=	tcindex_get,
	.put		=	tcindex_put,
	.change		=	tcindex_change,
	.delete		=	tcindex_delete,
	.walk		=	tcindex_walk,
	.dump		=	tcindex_dump,
	.owner		=	THIS_MODULE,
};

static int __init init_tcindex(void)
{
	return register_tcf_proto_ops(&cls_tcindex_ops);
}

static void __exit exit_tcindex(void)
{
	unregister_tcf_proto_ops(&cls_tcindex_ops);
}

module_init(init_tcindex)
module_exit(exit_tcindex)
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* net/sched/cls_tcindex.c Packet classifier for skb->tc_index
	3	*
	4	* Written 1998,1999 by Werner Almesberger, EPFL ICA
	5	*/
	6
1da177e4 LT	7	#include <linux/module.h>
	8	#include <linux/types.h>
	9	#include <linux/kernel.h>
	10	#include <linux/skbuff.h>
	11	#include <linux/errno.h>
	12	#include <linux/netdevice.h>
	13	#include <net/ip.h>
	14	#include <net/act_api.h>
	15	#include <net/pkt_cls.h>
	16	#include <net/route.h>
	17
	18
	19	/*
	20	* Not quite sure if we need all the xchgs Alexey uses when accessing things.
	21	* Can always add them later ... :)
	22	*/
	23
	24	/*
	25	* Passing parameters to the root seems to be done more awkwardly than really
	26	* necessary. At least, u32 doesn't seem to use such dirty hacks. To be
	27	* verified. FIXME.
	28	*/
	29
	30	#define PERFECT_HASH_THRESHOLD 64 /* use perfect hash if not bigger */
	31	#define DEFAULT_HASH_SIZE 64 /* optimized for diffserv */
	32
	33
	34	#if 1 /* control */
	35	#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
	36	#else
	37	#define DPRINTK(format,args...)
	38	#endif
	39
	40	#if 0 /* data */
	41	#define D2PRINTK(format,args...) printk(KERN_DEBUG format,##args)
	42	#else
	43	#define D2PRINTK(format,args...)
	44	#endif
	45
	46
	47	#define PRIV(tp) ((struct tcindex_data *) (tp)->root)
	48
	49
	50	struct tcindex_filter_result {
	51	struct tcf_exts exts;
	52	struct tcf_result res;
	53	};
	54
	55	struct tcindex_filter {
	56	u16 key;
	57	struct tcindex_filter_result result;
	58	struct tcindex_filter *next;
	59	};
	60
	61
	62	struct tcindex_data {
	63	struct tcindex_filter_result perfect; / perfect hash; NULL if none */
	64	struct tcindex_filter *h; / imperfect hash; only used if !perfect;
	65	NULL if unused */
	66	u16 mask; /* AND key with mask */
	67	int shift; /* shift ANDed key to the right */
	68	int hash; /* hash table size; 0 if undefined */
	69	int alloc_hash; /* allocated size */
	70	int fall_through; /* 0: only classify if explicit match */
71	};
72
73	static struct tcf_ext_map tcindex_ext_map = {
74	.police = TCA_TCINDEX_POLICE,
75	.action = TCA_TCINDEX_ACT
76	};
77
78	static inline int
79	tcindex_filter_is_set(struct tcindex_filter_result *r)
80	{
81	return tcf_exts_is_predicative(&r->exts) \|\| r->res.classid;
82	}
83
84	static struct tcindex_filter_result *
85	tcindex_lookup(struct tcindex_data *p, u16 key)
86	{
87	struct tcindex_filter *f;
88
89	if (p->perfect)
90	return tcindex_filter_is_set(p->perfect + key) ?
91	p->perfect + key : NULL;
92	else if (p->h) {
93	for (f = p->h[key % p->hash]; f; f = f->next)
94	if (f->key == key)
95	return &f->result;
96	}
97
98	return NULL;
99	}
100
101
102	static int tcindex_classify(struct sk_buff skb, struct tcf_proto tp,
103	struct tcf_result *res)
104	{
105	struct tcindex_data *p = PRIV(tp);
106	struct tcindex_filter_result *f;
107	int key = (skb->tc_index & p->mask) >> p->shift;
108
109	D2PRINTK("tcindex_classify(skb %p,tp %p,res %p),p %p\n",skb,tp,res,p);
110
111	f = tcindex_lookup(p, key);
112	if (!f) {
113	if (!p->fall_through)
114	return -1;
115	res->classid = TC_H_MAKE(TC_H_MAJ(tp->q->handle), key);
116	res->class = 0;
117	D2PRINTK("alg 0x%x\n",res->classid);
118	return 0;
119	}
120	*res = f->res;
121	D2PRINTK("map 0x%x\n",res->classid);
122
123	return tcf_exts_exec(skb, &f->exts, res);
124	}
125
126
127	static unsigned long tcindex_get(struct tcf_proto *tp, u32 handle)
128	{
129	struct tcindex_data *p = PRIV(tp);
130	struct tcindex_filter_result *r;
131
132	DPRINTK("tcindex_get(tp %p,handle 0x%08x)\n",tp,handle);
133	if (p->perfect && handle >= p->alloc_hash)
134	return 0;
135	r = tcindex_lookup(p, handle);
136	return r && tcindex_filter_is_set(r) ? (unsigned long) r : 0UL;
137	}
138
139
140	static void tcindex_put(struct tcf_proto *tp, unsigned long f)
141	{
142	DPRINTK("tcindex_put(tp %p,f 0x%lx)\n",tp,f);
143	}
144
145
146	static int tcindex_init(struct tcf_proto *tp)
147	{
148	struct tcindex_data *p;
149
150	DPRINTK("tcindex_init(tp %p)\n",tp);
0da974f4	151	p = kzalloc(sizeof(struct tcindex_data),GFP_KERNEL);
1da177e4 LT	152	if (!p)
	153	return -ENOMEM;
	154
1da177e4 LT	155	p->mask = 0xffff;
	156	p->hash = DEFAULT_HASH_SIZE;
	157	p->fall_through = 1;
	158
	159	tp->root = p;
	160	return 0;
	161	}
	162
	163
	164	static int
	165	__tcindex_delete(struct tcf_proto *tp, unsigned long arg, int lock)
	166	{
	167	struct tcindex_data *p = PRIV(tp);
	168	struct tcindex_filter_result r = (struct tcindex_filter_result ) arg;
	169	struct tcindex_filter *f = NULL;
	170
	171	DPRINTK("tcindex_delete(tp %p,arg 0x%lx),p %p,f %p\n",tp,arg,p,f);
	172	if (p->perfect) {
	173	if (!r->res.class)
	174	return -ENOENT;
	175	} else {
	176	int i;
	177	struct tcindex_filter **walk = NULL;
	178
	179	for (i = 0; i < p->hash; i++)
	180	for (walk = p->h+i; walk; walk = &(walk)->next)
	181	if (&(*walk)->result == r)
	182	goto found;
	183	return -ENOENT;
	184
	185	found:
	186	f = *walk;
	187	if (lock)
	188	tcf_tree_lock(tp);
	189	*walk = f->next;
	190	if (lock)
	191	tcf_tree_unlock(tp);
	192	}
	193	tcf_unbind_filter(tp, &r->res);
	194	tcf_exts_destroy(tp, &r->exts);
a51482bd	195	kfree(f);
1da177e4 LT	196	return 0;
	197	}
	198
	199	static int tcindex_delete(struct tcf_proto *tp, unsigned long arg)
	200	{
	201	return __tcindex_delete(tp, arg, 1);
	202	}
	203
	204	static inline int
	205	valid_perfect_hash(struct tcindex_data *p)
	206	{
	207	return p->hash > (p->mask >> p->shift);
	208	}
	209
	210	static int
	211	tcindex_set_parms(struct tcf_proto *tp, unsigned long base, u32 handle,
	212	struct tcindex_data p, struct tcindex_filter_result r,
	213	struct rtattr *tb, struct rtattr est)
	214	{
	215	int err, balloc = 0;
	216	struct tcindex_filter_result new_filter_result, *old_r = r;
	217	struct tcindex_filter_result cr;
	218	struct tcindex_data cp;
	219	struct tcindex_filter f = NULL; / make gcc behave */
	220	struct tcf_exts e;
	221
	222	err = tcf_exts_validate(tp, tb, est, &e, &tcindex_ext_map);
	223	if (err < 0)
	224	return err;
10297b99	225
1da177e4 LT	226	memcpy(&cp, p, sizeof(cp));
	227	memset(&new_filter_result, 0, sizeof(new_filter_result));
	228
	229	if (old_r)
	230	memcpy(&cr, r, sizeof(cr));
	231	else
	232	memset(&cr, 0, sizeof(cr));
	233
	234	err = -EINVAL;
	235	if (tb[TCA_TCINDEX_HASH-1]) {
	236	if (RTA_PAYLOAD(tb[TCA_TCINDEX_HASH-1]) < sizeof(u32))
	237	goto errout;
	238	cp.hash = (u32 ) RTA_DATA(tb[TCA_TCINDEX_HASH-1]);
	239	}
	240
	241	if (tb[TCA_TCINDEX_MASK-1]) {
	242	if (RTA_PAYLOAD(tb[TCA_TCINDEX_MASK-1]) < sizeof(u16))
	243	goto errout;
	244	cp.mask = (u16 ) RTA_DATA(tb[TCA_TCINDEX_MASK-1]);
	245	}
	246
	247	if (tb[TCA_TCINDEX_SHIFT-1]) {
bb8a954f	248	if (RTA_PAYLOAD(tb[TCA_TCINDEX_SHIFT-1]) < sizeof(int))
1da177e4	249	goto errout;
bb8a954f	250	cp.shift = (int ) RTA_DATA(tb[TCA_TCINDEX_SHIFT-1]);
1da177e4 LT	251	}
	252
	253	err = -EBUSY;
	254	/* Hash already allocated, make sure that we still meet the
	255	* requirements for the allocated hash.
	256	*/
	257	if (cp.perfect) {
	258	if (!valid_perfect_hash(&cp) \|\|
	259	cp.hash > cp.alloc_hash)
	260	goto errout;
	261	} else if (cp.h && cp.hash != cp.alloc_hash)
	262	goto errout;
	263
	264	err = -EINVAL;
	265	if (tb[TCA_TCINDEX_FALL_THROUGH-1]) {
	266	if (RTA_PAYLOAD(tb[TCA_TCINDEX_FALL_THROUGH-1]) < sizeof(u32))
	267	goto errout;
	268	cp.fall_through =
	269	(u32 ) RTA_DATA(tb[TCA_TCINDEX_FALL_THROUGH-1]);
	270	}
	271
	272	if (!cp.hash) {
	273	/* Hash not specified, use perfect hash if the upper limit
	274	* of the hashing index is below the threshold.
	275	*/
	276	if ((cp.mask >> cp.shift) < PERFECT_HASH_THRESHOLD)
	277	cp.hash = (cp.mask >> cp.shift)+1;
	278	else
	279	cp.hash = DEFAULT_HASH_SIZE;
	280	}
	281
	282	if (!cp.perfect && !cp.h)
	283	cp.alloc_hash = cp.hash;
	284
	285	/* Note: this could be as restrictive as if (handle & ~(mask >> shift))
	286	* but then, we'd fail handles that may become valid after some future
	287	* mask change. While this is extremely unlikely to ever matter,
	288	* the check below is safer (and also more backwards-compatible).
	289	*/
	290	if (cp.perfect \|\| valid_perfect_hash(&cp))
	291	if (handle >= cp.alloc_hash)
	292	goto errout;
	293
	294
	295	err = -ENOMEM;
	296	if (!cp.perfect && !cp.h) {
	297	if (valid_perfect_hash(&cp)) {
0da974f4	298	cp.perfect = kcalloc(cp.hash, sizeof(*r), GFP_KERNEL);
1da177e4 LT	299	if (!cp.perfect)
1da177e4 LT	300	goto errout;
1da177e4 LT	301	balloc = 1;
1da177e4 LT	302	} else {
0da974f4	303	cp.h = kcalloc(cp.hash, sizeof(f), GFP_KERNEL);
1da177e4 LT	304	if (!cp.h)
1da177e4 LT	305	goto errout;
1da177e4 LT	306	balloc = 2;
	307	}
	308	}
	309
	310	if (cp.perfect)
	311	r = cp.perfect + handle;
	312	else
	313	r = tcindex_lookup(&cp, handle) ? : &new_filter_result;
	314
	315	if (r == &new_filter_result) {
0da974f4	316	f = kzalloc(sizeof(*f), GFP_KERNEL);
1da177e4 LT	317	if (!f)
1da177e4 LT	318	goto errout_alloc;
10297b99	319	}
1da177e4 LT	320
	321	if (tb[TCA_TCINDEX_CLASSID-1]) {
	322	cr.res.classid = (u32 ) RTA_DATA(tb[TCA_TCINDEX_CLASSID-1]);
	323	tcf_bind_filter(tp, &cr.res, base);
10297b99	324	}
1da177e4 LT	325
	326	tcf_exts_change(tp, &cr.exts, &e);
	327
	328	tcf_tree_lock(tp);
	329	if (old_r && old_r != r)
	330	memset(old_r, 0, sizeof(*old_r));
	331
	332	memcpy(p, &cp, sizeof(cp));
	333	memcpy(r, &cr, sizeof(cr));
	334
	335	if (r == &new_filter_result) {
	336	struct tcindex_filter **fp;
	337
	338	f->key = handle;
	339	f->result = new_filter_result;
	340	f->next = NULL;
	341	for (fp = p->h+(handle % p->hash); fp; fp = &(fp)->next)
	342	/* nothing */;
	343	*fp = f;
10297b99	344	}
1da177e4 LT	345	tcf_tree_unlock(tp);
	346
	347	return 0;
	348
	349	errout_alloc:
	350	if (balloc == 1)
	351	kfree(cp.perfect);
	352	else if (balloc == 2)
	353	kfree(cp.h);
	354	errout:
	355	tcf_exts_destroy(tp, &e);
	356	return err;
	357	}
	358
	359	static int
	360	tcindex_change(struct tcf_proto *tp, unsigned long base, u32 handle,
	361	struct rtattr *tca, unsigned long arg)
	362	{
	363	struct rtattr *opt = tca[TCA_OPTIONS-1];
	364	struct rtattr *tb[TCA_TCINDEX_MAX];
	365	struct tcindex_data *p = PRIV(tp);
	366	struct tcindex_filter_result r = (struct tcindex_filter_result ) *arg;
	367
	368	DPRINTK("tcindex_change(tp %p,handle 0x%08x,tca %p,arg %p),opt %p,"
	369	"p %p,r %p,*arg 0x%lx\n",
	370	tp, handle, tca, arg, opt, p, r, arg ? *arg : 0L);
	371
	372	if (!opt)
	373	return 0;
	374
	375	if (rtattr_parse_nested(tb, TCA_TCINDEX_MAX, opt) < 0)
	376	return -EINVAL;
	377
	378	return tcindex_set_parms(tp, base, handle, p, r, tb, tca[TCA_RATE-1]);
	379	}
	380
	381
	382	static void tcindex_walk(struct tcf_proto tp, struct tcf_walker walker)
	383	{
	384	struct tcindex_data *p = PRIV(tp);
	385	struct tcindex_filter f,next;
	386	int i;
	387
	388	DPRINTK("tcindex_walk(tp %p,walker %p),p %p\n",tp,walker,p);
	389	if (p->perfect) {
	390	for (i = 0; i < p->hash; i++) {
	391	if (!p->perfect[i].res.class)
	392	continue;
	393	if (walker->count >= walker->skip) {
	394	if (walker->fn(tp,
	395	(unsigned long) (p->perfect+i), walker)
	396	< 0) {
	397	walker->stop = 1;
	398	return;
	399	}
	400	}
	401	walker->count++;
	402	}
	403	}
	404	if (!p->h)
	405	return;
	406	for (i = 0; i < p->hash; i++) {
	407	for (f = p->h[i]; f; f = next) {
	408	next = f->next;
409	if (walker->count >= walker->skip) {
410	if (walker->fn(tp,(unsigned long) &f->result,
411	walker) < 0) {
412	walker->stop = 1;
413	return;
414	}
415	}
416	walker->count++;
417	}
418	}
419	}
420
421
422	static int tcindex_destroy_element(struct tcf_proto *tp,
423	unsigned long arg, struct tcf_walker *walker)
424	{
425	return __tcindex_delete(tp, arg, 0);
426	}
427
428
429	static void tcindex_destroy(struct tcf_proto *tp)
430	{
431	struct tcindex_data *p = PRIV(tp);
432	struct tcf_walker walker;
433
434	DPRINTK("tcindex_destroy(tp %p),p %p\n",tp,p);
435	walker.count = 0;
436	walker.skip = 0;
437	walker.fn = &tcindex_destroy_element;
438	tcindex_walk(tp,&walker);
a51482bd JJ	439	kfree(p->perfect);
a51482bd JJ	440	kfree(p->h);
1da177e4 LT	441	kfree(p);
	442	tp->root = NULL;
	443	}
	444
	445
	446	static int tcindex_dump(struct tcf_proto *tp, unsigned long fh,
	447	struct sk_buff skb, struct tcmsg t)
	448	{
	449	struct tcindex_data *p = PRIV(tp);
	450	struct tcindex_filter_result r = (struct tcindex_filter_result ) fh;
27a884dc	451	unsigned char *b = skb_tail_pointer(skb);
1da177e4 LT	452	struct rtattr *rta;
	453
	454	DPRINTK("tcindex_dump(tp %p,fh 0x%lx,skb %p,t %p),p %p,r %p,b %p\n",
	455	tp,fh,skb,t,p,r,b);
	456	DPRINTK("p->perfect %p p->h %p\n",p->perfect,p->h);
	457	rta = (struct rtattr *) b;
	458	RTA_PUT(skb,TCA_OPTIONS,0,NULL);
	459	if (!fh) {
	460	t->tcm_handle = ~0; /* whatever ... */
	461	RTA_PUT(skb,TCA_TCINDEX_HASH,sizeof(p->hash),&p->hash);
	462	RTA_PUT(skb,TCA_TCINDEX_MASK,sizeof(p->mask),&p->mask);
	463	RTA_PUT(skb,TCA_TCINDEX_SHIFT,sizeof(p->shift),&p->shift);
	464	RTA_PUT(skb,TCA_TCINDEX_FALL_THROUGH,sizeof(p->fall_through),
	465	&p->fall_through);
27a884dc	466	rta->rta_len = skb_tail_pointer(skb) - b;
1da177e4 LT	467	} else {
	468	if (p->perfect) {
	469	t->tcm_handle = r-p->perfect;
	470	} else {
	471	struct tcindex_filter *f;
	472	int i;
	473
	474	t->tcm_handle = 0;
	475	for (i = 0; !t->tcm_handle && i < p->hash; i++) {
	476	for (f = p->h[i]; !t->tcm_handle && f;
	477	f = f->next) {
	478	if (&f->result == r)
	479	t->tcm_handle = f->key;
	480	}
	481	}
	482	}
	483	DPRINTK("handle = %d\n",t->tcm_handle);
	484	if (r->res.class)
	485	RTA_PUT(skb, TCA_TCINDEX_CLASSID, 4, &r->res.classid);
	486
	487	if (tcf_exts_dump(skb, &r->exts, &tcindex_ext_map) < 0)
	488	goto rtattr_failure;
27a884dc	489	rta->rta_len = skb_tail_pointer(skb) - b;
1da177e4 LT	490
	491	if (tcf_exts_dump_stats(skb, &r->exts, &tcindex_ext_map) < 0)
	492	goto rtattr_failure;
	493	}
10297b99	494
1da177e4 LT	495	return skb->len;
	496
	497	rtattr_failure:
	498	skb_trim(skb, b - skb->data);
	499	return -1;
	500	}
	501
	502	static struct tcf_proto_ops cls_tcindex_ops = {
	503	.next = NULL,
	504	.kind = "tcindex",
	505	.classify = tcindex_classify,
	506	.init = tcindex_init,
	507	.destroy = tcindex_destroy,
	508	.get = tcindex_get,
	509	.put = tcindex_put,
	510	.change = tcindex_change,
	511	.delete = tcindex_delete,
	512	.walk = tcindex_walk,
	513	.dump = tcindex_dump,
	514	.owner = THIS_MODULE,
	515	};
	516
	517	static int __init init_tcindex(void)
	518	{
	519	return register_tcf_proto_ops(&cls_tcindex_ops);
	520	}
	521
10297b99	522	static void __exit exit_tcindex(void)
1da177e4 LT	523	{
	524	unregister_tcf_proto_ops(&cls_tcindex_ops);
	525	}
	526
	527	module_init(init_tcindex)
	528	module_exit(exit_tcindex)
	529	MODULE_LICENSE("GPL");