[people/arne_f/kernel.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 <net/act_api.h>
#include <net/netlink.h>
#include <net/pkt_cls.h>

/*
 * 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 */


#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 const 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;

	pr_debug("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;
		pr_debug("alg 0x%x\n", res->classid);
		return 0;
	}
	*res = f->res;
	pr_debug("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;

	pr_debug("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)
{
	pr_debug("tcindex_put(tp %p,f 0x%lx)\n", tp, f);
}


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

	pr_debug("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;

	pr_debug("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 const struct nla_policy tcindex_policy[TCA_TCINDEX_MAX + 1] = {
	[TCA_TCINDEX_HASH]		= { .type = NLA_U32 },
	[TCA_TCINDEX_MASK]		= { .type = NLA_U16 },
	[TCA_TCINDEX_SHIFT]		= { .type = NLA_U32 },
	[TCA_TCINDEX_FALL_THROUGH]	= { .type = NLA_U32 },
	[TCA_TCINDEX_CLASSID]		= { .type = NLA_U32 },
};

static int
tcindex_set_parms(struct tcf_proto *tp, unsigned long base, u32 handle,
		  struct tcindex_data *p, struct tcindex_filter_result *r,
		  struct nlattr **tb, struct nlattr *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));

	if (tb[TCA_TCINDEX_HASH])
		cp.hash = nla_get_u32(tb[TCA_TCINDEX_HASH]);

	if (tb[TCA_TCINDEX_MASK])
		cp.mask = nla_get_u16(tb[TCA_TCINDEX_MASK]);

	if (tb[TCA_TCINDEX_SHIFT])
		cp.shift = nla_get_u32(tb[TCA_TCINDEX_SHIFT]);

	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])
		cp.fall_through = nla_get_u32(tb[TCA_TCINDEX_FALL_THROUGH]);

	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]) {
		cr.res.classid = nla_get_u32(tb[TCA_TCINDEX_CLASSID]);
		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 nlattr **tca, unsigned long *arg)
{
	struct nlattr *opt = tca[TCA_OPTIONS];
	struct nlattr *tb[TCA_TCINDEX_MAX + 1];
	struct tcindex_data *p = PRIV(tp);
	struct tcindex_filter_result *r = (struct tcindex_filter_result *) *arg;
	int err;

	pr_debug("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;

	err = nla_parse_nested(tb, TCA_TCINDEX_MAX, opt, tcindex_policy);
	if (err < 0)
		return err;

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


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;

	pr_debug("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;

	pr_debug("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 nlattr *nest;

	pr_debug("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);
	pr_debug("p->perfect %p p->h %p\n", p->perfect, p->h);

	nest = nla_nest_start(skb, TCA_OPTIONS);
	if (nest == NULL)
		goto nla_put_failure;

	if (!fh) {
		t->tcm_handle = ~0; /* whatever ... */
		NLA_PUT_U32(skb, TCA_TCINDEX_HASH, p->hash);
		NLA_PUT_U16(skb, TCA_TCINDEX_MASK, p->mask);
		NLA_PUT_U32(skb, TCA_TCINDEX_SHIFT, p->shift);
		NLA_PUT_U32(skb, TCA_TCINDEX_FALL_THROUGH, p->fall_through);
		nla_nest_end(skb, nest);
	} 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;
				}
			}
		}
		pr_debug("handle = %d\n", t->tcm_handle);
		if (r->res.class)
			NLA_PUT_U32(skb, TCA_TCINDEX_CLASSID, r->res.classid);

		if (tcf_exts_dump(skb, &r->exts, &tcindex_ext_map) < 0)
			goto nla_put_failure;
		nla_nest_end(skb, nest);

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

	return skb->len;

nla_put_failure:
	nlmsg_trim(skb, b);
	return -1;
}

static struct tcf_proto_ops cls_tcindex_ops __read_mostly = {
	.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>
1da177e4	12	#include <net/act_api.h>
dc5fc579	13	#include <net/netlink.h>
1da177e4	14	#include <net/pkt_cls.h>
1da177e4	15
1da177e4 LT	16	/*
	17	* Passing parameters to the root seems to be done more awkwardly than really
	18	* necessary. At least, u32 doesn't seem to use such dirty hacks. To be
	19	* verified. FIXME.
	20	*/
	21
	22	#define PERFECT_HASH_THRESHOLD 64 /* use perfect hash if not bigger */
	23	#define DEFAULT_HASH_SIZE 64 /* optimized for diffserv */
	24
	25
1da177e4 LT	26	#define PRIV(tp) ((struct tcindex_data *) (tp)->root)
	27
	28
	29	struct tcindex_filter_result {
	30	struct tcf_exts exts;
	31	struct tcf_result res;
	32	};
	33
	34	struct tcindex_filter {
	35	u16 key;
	36	struct tcindex_filter_result result;
	37	struct tcindex_filter *next;
	38	};
	39
	40
	41	struct tcindex_data {
	42	struct tcindex_filter_result perfect; / perfect hash; NULL if none */
	43	struct tcindex_filter *h; / imperfect hash; only used if !perfect;
	44	NULL if unused */
	45	u16 mask; /* AND key with mask */
	46	int shift; /* shift ANDed key to the right */
	47	int hash; /* hash table size; 0 if undefined */
	48	int alloc_hash; /* allocated size */
	49	int fall_through; /* 0: only classify if explicit match */
	50	};
	51
5239008b	52	static const struct tcf_ext_map tcindex_ext_map = {
1da177e4 LT	53	.police = TCA_TCINDEX_POLICE,
	54	.action = TCA_TCINDEX_ACT
	55	};
	56
	57	static inline int
	58	tcindex_filter_is_set(struct tcindex_filter_result *r)
	59	{
	60	return tcf_exts_is_predicative(&r->exts) \|\| r->res.classid;
	61	}
	62
	63	static struct tcindex_filter_result *
	64	tcindex_lookup(struct tcindex_data *p, u16 key)
	65	{
	66	struct tcindex_filter *f;
	67
	68	if (p->perfect)
	69	return tcindex_filter_is_set(p->perfect + key) ?
	70	p->perfect + key : NULL;
	71	else if (p->h) {
	72	for (f = p->h[key % p->hash]; f; f = f->next)
	73	if (f->key == key)
	74	return &f->result;
	75	}
	76
	77	return NULL;
	78	}
	79
	80
	81	static int tcindex_classify(struct sk_buff skb, struct tcf_proto tp,
	82	struct tcf_result *res)
	83	{
	84	struct tcindex_data *p = PRIV(tp);
	85	struct tcindex_filter_result *f;
	86	int key = (skb->tc_index & p->mask) >> p->shift;
	87
aa767bfe SH	88	pr_debug("tcindex_classify(skb %p,tp %p,res %p),p %p\n",
aa767bfe SH	89	skb, tp, res, p);
1da177e4 LT	90
	91	f = tcindex_lookup(p, key);
	92	if (!f) {
	93	if (!p->fall_through)
	94	return -1;
	95	res->classid = TC_H_MAKE(TC_H_MAJ(tp->q->handle), key);
	96	res->class = 0;
aa767bfe	97	pr_debug("alg 0x%x\n", res->classid);
1da177e4 LT	98	return 0;
	99	}
	100	*res = f->res;
aa767bfe	101	pr_debug("map 0x%x\n", res->classid);
1da177e4 LT	102
	103	return tcf_exts_exec(skb, &f->exts, res);
	104	}
	105
	106
	107	static unsigned long tcindex_get(struct tcf_proto *tp, u32 handle)
	108	{
	109	struct tcindex_data *p = PRIV(tp);
	110	struct tcindex_filter_result *r;
	111
aa767bfe	112	pr_debug("tcindex_get(tp %p,handle 0x%08x)\n", tp, handle);
1da177e4 LT	113	if (p->perfect && handle >= p->alloc_hash)
	114	return 0;
	115	r = tcindex_lookup(p, handle);
	116	return r && tcindex_filter_is_set(r) ? (unsigned long) r : 0UL;
	117	}
	118
	119
	120	static void tcindex_put(struct tcf_proto *tp, unsigned long f)
	121	{
aa767bfe	122	pr_debug("tcindex_put(tp %p,f 0x%lx)\n", tp, f);
1da177e4 LT	123	}
	124
	125
	126	static int tcindex_init(struct tcf_proto *tp)
	127	{
	128	struct tcindex_data *p;
	129
aa767bfe SH	130	pr_debug("tcindex_init(tp %p)\n", tp);
aa767bfe SH	131	p = kzalloc(sizeof(struct tcindex_data), GFP_KERNEL);
1da177e4 LT	132	if (!p)
	133	return -ENOMEM;
	134
1da177e4 LT	135	p->mask = 0xffff;
	136	p->hash = DEFAULT_HASH_SIZE;
	137	p->fall_through = 1;
	138
	139	tp->root = p;
	140	return 0;
	141	}
	142
	143
	144	static int
	145	__tcindex_delete(struct tcf_proto *tp, unsigned long arg, int lock)
	146	{
	147	struct tcindex_data *p = PRIV(tp);
	148	struct tcindex_filter_result r = (struct tcindex_filter_result ) arg;
	149	struct tcindex_filter *f = NULL;
	150
aa767bfe	151	pr_debug("tcindex_delete(tp %p,arg 0x%lx),p %p,f %p\n", tp, arg, p, f);
1da177e4 LT	152	if (p->perfect) {
	153	if (!r->res.class)
	154	return -ENOENT;
	155	} else {
	156	int i;
	157	struct tcindex_filter **walk = NULL;
	158
	159	for (i = 0; i < p->hash; i++)
	160	for (walk = p->h+i; walk; walk = &(walk)->next)
	161	if (&(*walk)->result == r)
	162	goto found;
	163	return -ENOENT;
	164
	165	found:
	166	f = *walk;
	167	if (lock)
	168	tcf_tree_lock(tp);
	169	*walk = f->next;
	170	if (lock)
	171	tcf_tree_unlock(tp);
	172	}
	173	tcf_unbind_filter(tp, &r->res);
	174	tcf_exts_destroy(tp, &r->exts);
a51482bd	175	kfree(f);
1da177e4 LT	176	return 0;
	177	}
	178
	179	static int tcindex_delete(struct tcf_proto *tp, unsigned long arg)
	180	{
	181	return __tcindex_delete(tp, arg, 1);
	182	}
	183
	184	static inline int
	185	valid_perfect_hash(struct tcindex_data *p)
	186	{
	187	return p->hash > (p->mask >> p->shift);
	188	}
	189
6fa8c014 PM	190	static const struct nla_policy tcindex_policy[TCA_TCINDEX_MAX + 1] = {
	191	[TCA_TCINDEX_HASH] = { .type = NLA_U32 },
	192	[TCA_TCINDEX_MASK] = { .type = NLA_U16 },
	193	[TCA_TCINDEX_SHIFT] = { .type = NLA_U32 },
	194	[TCA_TCINDEX_FALL_THROUGH] = { .type = NLA_U32 },
	195	[TCA_TCINDEX_CLASSID] = { .type = NLA_U32 },
	196	};
	197
1da177e4 LT	198	static int
	199	tcindex_set_parms(struct tcf_proto *tp, unsigned long base, u32 handle,
	200	struct tcindex_data p, struct tcindex_filter_result r,
add93b61	201	struct nlattr *tb, struct nlattr est)
1da177e4 LT	202	{
	203	int err, balloc = 0;
	204	struct tcindex_filter_result new_filter_result, *old_r = r;
	205	struct tcindex_filter_result cr;
	206	struct tcindex_data cp;
	207	struct tcindex_filter f = NULL; / make gcc behave */
	208	struct tcf_exts e;
	209
	210	err = tcf_exts_validate(tp, tb, est, &e, &tcindex_ext_map);
	211	if (err < 0)
	212	return err;
10297b99	213
1da177e4 LT	214	memcpy(&cp, p, sizeof(cp));
	215	memset(&new_filter_result, 0, sizeof(new_filter_result));
	216
	217	if (old_r)
	218	memcpy(&cr, r, sizeof(cr));
	219	else
	220	memset(&cr, 0, sizeof(cr));
	221
6fa8c014	222	if (tb[TCA_TCINDEX_HASH])
1587bac4	223	cp.hash = nla_get_u32(tb[TCA_TCINDEX_HASH]);
1da177e4	224
6fa8c014	225	if (tb[TCA_TCINDEX_MASK])
1587bac4	226	cp.mask = nla_get_u16(tb[TCA_TCINDEX_MASK]);
1da177e4	227
6fa8c014	228	if (tb[TCA_TCINDEX_SHIFT])
1587bac4	229	cp.shift = nla_get_u32(tb[TCA_TCINDEX_SHIFT]);
1da177e4 LT	230
	231	err = -EBUSY;
	232	/* Hash already allocated, make sure that we still meet the
	233	* requirements for the allocated hash.
	234	*/
	235	if (cp.perfect) {
	236	if (!valid_perfect_hash(&cp) \|\|
	237	cp.hash > cp.alloc_hash)
	238	goto errout;
	239	} else if (cp.h && cp.hash != cp.alloc_hash)
	240	goto errout;
	241
	242	err = -EINVAL;
6fa8c014	243	if (tb[TCA_TCINDEX_FALL_THROUGH])
1587bac4	244	cp.fall_through = nla_get_u32(tb[TCA_TCINDEX_FALL_THROUGH]);
1da177e4 LT	245
	246	if (!cp.hash) {
	247	/* Hash not specified, use perfect hash if the upper limit
	248	* of the hashing index is below the threshold.
	249	*/
	250	if ((cp.mask >> cp.shift) < PERFECT_HASH_THRESHOLD)
	251	cp.hash = (cp.mask >> cp.shift)+1;
	252	else
	253	cp.hash = DEFAULT_HASH_SIZE;
	254	}
	255
	256	if (!cp.perfect && !cp.h)
	257	cp.alloc_hash = cp.hash;
	258
	259	/* Note: this could be as restrictive as if (handle & ~(mask >> shift))
	260	* but then, we'd fail handles that may become valid after some future
	261	* mask change. While this is extremely unlikely to ever matter,
	262	* the check below is safer (and also more backwards-compatible).
	263	*/
	264	if (cp.perfect \|\| valid_perfect_hash(&cp))
	265	if (handle >= cp.alloc_hash)
	266	goto errout;
	267
	268
	269	err = -ENOMEM;
	270	if (!cp.perfect && !cp.h) {
	271	if (valid_perfect_hash(&cp)) {
0da974f4	272	cp.perfect = kcalloc(cp.hash, sizeof(*r), GFP_KERNEL);
1da177e4 LT	273	if (!cp.perfect)
1da177e4 LT	274	goto errout;
1da177e4 LT	275	balloc = 1;
1da177e4 LT	276	} else {
0da974f4	277	cp.h = kcalloc(cp.hash, sizeof(f), GFP_KERNEL);
1da177e4 LT	278	if (!cp.h)
1da177e4 LT	279	goto errout;
1da177e4 LT	280	balloc = 2;
	281	}
	282	}
	283
	284	if (cp.perfect)
	285	r = cp.perfect + handle;
	286	else
	287	r = tcindex_lookup(&cp, handle) ? : &new_filter_result;
	288
	289	if (r == &new_filter_result) {
0da974f4	290	f = kzalloc(sizeof(*f), GFP_KERNEL);
1da177e4 LT	291	if (!f)
1da177e4 LT	292	goto errout_alloc;
10297b99	293	}
1da177e4	294
add93b61	295	if (tb[TCA_TCINDEX_CLASSID]) {
1587bac4	296	cr.res.classid = nla_get_u32(tb[TCA_TCINDEX_CLASSID]);
1da177e4	297	tcf_bind_filter(tp, &cr.res, base);
10297b99	298	}
1da177e4 LT	299
	300	tcf_exts_change(tp, &cr.exts, &e);
	301
	302	tcf_tree_lock(tp);
	303	if (old_r && old_r != r)
	304	memset(old_r, 0, sizeof(*old_r));
	305
	306	memcpy(p, &cp, sizeof(cp));
	307	memcpy(r, &cr, sizeof(cr));
	308
	309	if (r == &new_filter_result) {
	310	struct tcindex_filter **fp;
	311
	312	f->key = handle;
	313	f->result = new_filter_result;
	314	f->next = NULL;
	315	for (fp = p->h+(handle % p->hash); fp; fp = &(fp)->next)
	316	/* nothing */;
	317	*fp = f;
10297b99	318	}
1da177e4 LT	319	tcf_tree_unlock(tp);
	320
	321	return 0;
	322
	323	errout_alloc:
	324	if (balloc == 1)
	325	kfree(cp.perfect);
	326	else if (balloc == 2)
	327	kfree(cp.h);
	328	errout:
	329	tcf_exts_destroy(tp, &e);
	330	return err;
	331	}
	332
	333	static int
	334	tcindex_change(struct tcf_proto *tp, unsigned long base, u32 handle,
add93b61	335	struct nlattr *tca, unsigned long arg)
1da177e4	336	{
add93b61 PM	337	struct nlattr *opt = tca[TCA_OPTIONS];
add93b61 PM	338	struct nlattr *tb[TCA_TCINDEX_MAX + 1];
1da177e4 LT	339	struct tcindex_data *p = PRIV(tp);
1da177e4 LT	340	struct tcindex_filter_result r = (struct tcindex_filter_result ) *arg;
cee63723	341	int err;
1da177e4	342
aa767bfe	343	pr_debug("tcindex_change(tp %p,handle 0x%08x,tca %p,arg %p),opt %p,"
1da177e4 LT	344	"p %p,r %p,*arg 0x%lx\n",
	345	tp, handle, tca, arg, opt, p, r, arg ? *arg : 0L);
	346
	347	if (!opt)
	348	return 0;
	349
6fa8c014	350	err = nla_parse_nested(tb, TCA_TCINDEX_MAX, opt, tcindex_policy);
cee63723 PM	351	if (err < 0)
cee63723 PM	352	return err;
1da177e4	353
add93b61	354	return tcindex_set_parms(tp, base, handle, p, r, tb, tca[TCA_RATE]);
1da177e4 LT	355	}
	356
	357
	358	static void tcindex_walk(struct tcf_proto tp, struct tcf_walker walker)
	359	{
	360	struct tcindex_data *p = PRIV(tp);
aa767bfe	361	struct tcindex_filter f, next;
1da177e4 LT	362	int i;
1da177e4 LT	363
aa767bfe	364	pr_debug("tcindex_walk(tp %p,walker %p),p %p\n", tp, walker, p);
1da177e4 LT	365	if (p->perfect) {
	366	for (i = 0; i < p->hash; i++) {
	367	if (!p->perfect[i].res.class)
	368	continue;
	369	if (walker->count >= walker->skip) {
	370	if (walker->fn(tp,
	371	(unsigned long) (p->perfect+i), walker)
	372	< 0) {
	373	walker->stop = 1;
	374	return;
	375	}
	376	}
	377	walker->count++;
	378	}
	379	}
	380	if (!p->h)
	381	return;
	382	for (i = 0; i < p->hash; i++) {
	383	for (f = p->h[i]; f; f = next) {
	384	next = f->next;
	385	if (walker->count >= walker->skip) {
aa767bfe	386	if (walker->fn(tp, (unsigned long) &f->result,
1da177e4 LT	387	walker) < 0) {
	388	walker->stop = 1;
	389	return;
	390	}
	391	}
	392	walker->count++;
	393	}
	394	}
	395	}
	396
	397
	398	static int tcindex_destroy_element(struct tcf_proto *tp,
	399	unsigned long arg, struct tcf_walker *walker)
	400	{
	401	return __tcindex_delete(tp, arg, 0);
	402	}
	403
	404
	405	static void tcindex_destroy(struct tcf_proto *tp)
	406	{
	407	struct tcindex_data *p = PRIV(tp);
	408	struct tcf_walker walker;
	409
aa767bfe	410	pr_debug("tcindex_destroy(tp %p),p %p\n", tp, p);
1da177e4 LT	411	walker.count = 0;
	412	walker.skip = 0;
	413	walker.fn = &tcindex_destroy_element;
aa767bfe	414	tcindex_walk(tp, &walker);
a51482bd JJ	415	kfree(p->perfect);
a51482bd JJ	416	kfree(p->h);
1da177e4 LT	417	kfree(p);
	418	tp->root = NULL;
	419	}
	420
	421
	422	static int tcindex_dump(struct tcf_proto *tp, unsigned long fh,
	423	struct sk_buff skb, struct tcmsg t)
	424	{
	425	struct tcindex_data *p = PRIV(tp);
	426	struct tcindex_filter_result r = (struct tcindex_filter_result ) fh;
27a884dc	427	unsigned char *b = skb_tail_pointer(skb);
4b3550ef	428	struct nlattr *nest;
1da177e4	429
aa767bfe SH	430	pr_debug("tcindex_dump(tp %p,fh 0x%lx,skb %p,t %p),p %p,r %p,b %p\n",
	431	tp, fh, skb, t, p, r, b);
	432	pr_debug("p->perfect %p p->h %p\n", p->perfect, p->h);
4b3550ef PM	433
	434	nest = nla_nest_start(skb, TCA_OPTIONS);
	435	if (nest == NULL)
	436	goto nla_put_failure;
	437
1da177e4 LT	438	if (!fh) {
1da177e4 LT	439	t->tcm_handle = ~0; /* whatever ... */
24beeab5 PM	440	NLA_PUT_U32(skb, TCA_TCINDEX_HASH, p->hash);
	441	NLA_PUT_U16(skb, TCA_TCINDEX_MASK, p->mask);
	442	NLA_PUT_U32(skb, TCA_TCINDEX_SHIFT, p->shift);
	443	NLA_PUT_U32(skb, TCA_TCINDEX_FALL_THROUGH, p->fall_through);
4b3550ef	444	nla_nest_end(skb, nest);
1da177e4 LT	445	} else {
	446	if (p->perfect) {
	447	t->tcm_handle = r-p->perfect;
	448	} else {
	449	struct tcindex_filter *f;
	450	int i;
	451
	452	t->tcm_handle = 0;
	453	for (i = 0; !t->tcm_handle && i < p->hash; i++) {
	454	for (f = p->h[i]; !t->tcm_handle && f;
	455	f = f->next) {
	456	if (&f->result == r)
	457	t->tcm_handle = f->key;
	458	}
	459	}
	460	}
aa767bfe	461	pr_debug("handle = %d\n", t->tcm_handle);
1da177e4	462	if (r->res.class)
24beeab5	463	NLA_PUT_U32(skb, TCA_TCINDEX_CLASSID, r->res.classid);
1da177e4 LT	464
1da177e4 LT	465	if (tcf_exts_dump(skb, &r->exts, &tcindex_ext_map) < 0)
add93b61	466	goto nla_put_failure;
4b3550ef	467	nla_nest_end(skb, nest);
1da177e4 LT	468
1da177e4 LT	469	if (tcf_exts_dump_stats(skb, &r->exts, &tcindex_ext_map) < 0)
add93b61	470	goto nla_put_failure;
1da177e4	471	}
10297b99	472
1da177e4 LT	473	return skb->len;
1da177e4 LT	474
add93b61	475	nla_put_failure:
dc5fc579	476	nlmsg_trim(skb, b);
1da177e4 LT	477	return -1;
	478	}
	479
2eb9d75c	480	static struct tcf_proto_ops cls_tcindex_ops __read_mostly = {
1da177e4 LT	481	.kind = "tcindex",
	482	.classify = tcindex_classify,
	483	.init = tcindex_init,
	484	.destroy = tcindex_destroy,
	485	.get = tcindex_get,
	486	.put = tcindex_put,
	487	.change = tcindex_change,
	488	.delete = tcindex_delete,
	489	.walk = tcindex_walk,
	490	.dump = tcindex_dump,
	491	.owner = THIS_MODULE,
	492	};
	493
	494	static int __init init_tcindex(void)
	495	{
	496	return register_tcf_proto_ops(&cls_tcindex_ops);
	497	}
	498
10297b99	499	static void __exit exit_tcindex(void)
1da177e4 LT	500	{
	501	unregister_tcf_proto_ops(&cls_tcindex_ops);
	502	}
	503
	504	module_init(init_tcindex)
	505	module_exit(exit_tcindex)
	506	MODULE_LICENSE("GPL");