[net-next-2.6.git] / net / sched / em_text.c

/*
 * net/sched/em_text.c	Textsearch ematch
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 *
 * Authors:	Thomas Graf <tgraf@suug.ch>
 */

#include <linux/slab.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/skbuff.h>
#include <linux/textsearch.h>
#include <linux/tc_ematch/tc_em_text.h>
#include <net/pkt_cls.h>

struct text_match
{
	u16			from_offset;
	u16			to_offset;
	u8			from_layer;
	u8			to_layer;
	struct ts_config	*config;
};

#define EM_TEXT_PRIV(m) ((struct text_match *) (m)->data)

static int em_text_match(struct sk_buff *skb, struct tcf_ematch *m,
			 struct tcf_pkt_info *info)
{
	struct text_match *tm = EM_TEXT_PRIV(m);
	int from, to;
	struct ts_state state;

	from = tcf_get_base_ptr(skb, tm->from_layer) - skb->data;
	from += tm->from_offset;

	to = tcf_get_base_ptr(skb, tm->to_layer) - skb->data;
	to += tm->to_offset;

	return skb_find_text(skb, from, to, tm->config, &state) != UINT_MAX;
}

static int em_text_change(struct tcf_proto *tp, void *data, int len,
			  struct tcf_ematch *m)
{
	struct text_match *tm;
	struct tcf_em_text *conf = data;
	struct ts_config *ts_conf;
	int flags = 0;

	if (len < sizeof(*conf) || len < (sizeof(*conf) + conf->pattern_len))
		return -EINVAL;

	if (conf->from_layer > conf->to_layer)
		return -EINVAL;

	if (conf->from_layer == conf->to_layer &&
	    conf->from_offset > conf->to_offset)
		return -EINVAL;

retry:
	ts_conf = textsearch_prepare(conf->algo, (u8 *) conf + sizeof(*conf),
				     conf->pattern_len, GFP_KERNEL, flags);

	if (flags & TS_AUTOLOAD)
		rtnl_lock();

	if (IS_ERR(ts_conf)) {
		if (PTR_ERR(ts_conf) == -ENOENT && !(flags & TS_AUTOLOAD)) {
			rtnl_unlock();
			flags |= TS_AUTOLOAD;
			goto retry;
		} else
			return PTR_ERR(ts_conf);
	} else if (flags & TS_AUTOLOAD) {
		textsearch_destroy(ts_conf);
		return -EAGAIN;
	}

	tm = kmalloc(sizeof(*tm), GFP_KERNEL);
	if (tm == NULL) {
		textsearch_destroy(ts_conf);
		return -ENOBUFS;
	}

	tm->from_offset = conf->from_offset;
	tm->to_offset   = conf->to_offset;
	tm->from_layer  = conf->from_layer;
	tm->to_layer    = conf->to_layer;
	tm->config      = ts_conf;

	m->datalen = sizeof(*tm);
	m->data = (unsigned long) tm;

	return 0;
}

static void em_text_destroy(struct tcf_proto *tp, struct tcf_ematch *m)
{
	if (EM_TEXT_PRIV(m) && EM_TEXT_PRIV(m)->config)
		textsearch_destroy(EM_TEXT_PRIV(m)->config);
}

static int em_text_dump(struct sk_buff *skb, struct tcf_ematch *m)
{
	struct text_match *tm = EM_TEXT_PRIV(m);
	struct tcf_em_text conf;

	strncpy(conf.algo, tm->config->ops->name, sizeof(conf.algo) - 1);
	conf.from_offset = tm->from_offset;
	conf.to_offset = tm->to_offset;
	conf.from_layer = tm->from_layer;
	conf.to_layer = tm->to_layer;
	conf.pattern_len = textsearch_get_pattern_len(tm->config);
	conf.pad = 0;

	if (nla_put_nohdr(skb, sizeof(conf), &conf) < 0)
		goto nla_put_failure;
	if (nla_append(skb, conf.pattern_len,
		       textsearch_get_pattern(tm->config)) < 0)
		goto nla_put_failure;
	return 0;

nla_put_failure:
	return -1;
}

static struct tcf_ematch_ops em_text_ops = {
	.kind	  = TCF_EM_TEXT,
	.change	  = em_text_change,
	.match	  = em_text_match,
	.destroy  = em_text_destroy,
	.dump	  = em_text_dump,
	.owner	  = THIS_MODULE,
	.link	  = LIST_HEAD_INIT(em_text_ops.link)
};

static int __init init_em_text(void)
{
	return tcf_em_register(&em_text_ops);
}

static void __exit exit_em_text(void)
{
	tcf_em_unregister(&em_text_ops);
}

MODULE_LICENSE("GPL");

module_init(init_em_text);
module_exit(exit_em_text);

MODULE_ALIAS_TCF_EMATCH(TCF_EM_TEXT);
Commit	Line	Data
d675c989 TG	1	/*
	2	* net/sched/em_text.c Textsearch ematch
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License
	6	* as published by the Free Software Foundation; either version
	7	* 2 of the License, or (at your option) any later version.
	8	*
	9	* Authors: Thomas Graf <tgraf@suug.ch>
	10	*/
	11
5a0e3ad6	12	#include <linux/slab.h>
d675c989 TG	13	#include <linux/module.h>
	14	#include <linux/types.h>
	15	#include <linux/kernel.h>
d675c989 TG	16	#include <linux/string.h>
	17	#include <linux/skbuff.h>
	18	#include <linux/textsearch.h>
	19	#include <linux/tc_ematch/tc_em_text.h>
	20	#include <net/pkt_cls.h>
	21
	22	struct text_match
	23	{
	24	u16 from_offset;
	25	u16 to_offset;
	26	u8 from_layer;
	27	u8 to_layer;
	28	struct ts_config *config;
	29	};
	30
	31	#define EM_TEXT_PRIV(m) ((struct text_match *) (m)->data)
	32
	33	static int em_text_match(struct sk_buff skb, struct tcf_ematch m,
	34	struct tcf_pkt_info *info)
	35	{
	36	struct text_match *tm = EM_TEXT_PRIV(m);
	37	int from, to;
	38	struct ts_state state;
	39
	40	from = tcf_get_base_ptr(skb, tm->from_layer) - skb->data;
	41	from += tm->from_offset;
	42
	43	to = tcf_get_base_ptr(skb, tm->to_layer) - skb->data;
	44	to += tm->to_offset;
	45
	46	return skb_find_text(skb, from, to, tm->config, &state) != UINT_MAX;
	47	}
	48
	49	static int em_text_change(struct tcf_proto tp, void data, int len,
	50	struct tcf_ematch *m)
	51	{
	52	struct text_match *tm;
	53	struct tcf_em_text *conf = data;
	54	struct ts_config *ts_conf;
	55	int flags = 0;
	56
d675c989 TG	57	if (len < sizeof(conf) \|\| len < (sizeof(conf) + conf->pattern_len))
	58	return -EINVAL;
	59
	60	if (conf->from_layer > conf->to_layer)
	61	return -EINVAL;
	62
	63	if (conf->from_layer == conf->to_layer &&
	64	conf->from_offset > conf->to_offset)
	65	return -EINVAL;
	66
	67	retry:
	68	ts_conf = textsearch_prepare(conf->algo, (u8 ) conf + sizeof(conf),
	69	conf->pattern_len, GFP_KERNEL, flags);
	70
	71	if (flags & TS_AUTOLOAD)
	72	rtnl_lock();
	73
	74	if (IS_ERR(ts_conf)) {
	75	if (PTR_ERR(ts_conf) == -ENOENT && !(flags & TS_AUTOLOAD)) {
	76	rtnl_unlock();
	77	flags \|= TS_AUTOLOAD;
	78	goto retry;
	79	} else
	80	return PTR_ERR(ts_conf);
	81	} else if (flags & TS_AUTOLOAD) {
	82	textsearch_destroy(ts_conf);
	83	return -EAGAIN;
	84	}
	85
	86	tm = kmalloc(sizeof(*tm), GFP_KERNEL);
	87	if (tm == NULL) {
	88	textsearch_destroy(ts_conf);
	89	return -ENOBUFS;
	90	}
	91
	92	tm->from_offset = conf->from_offset;
	93	tm->to_offset = conf->to_offset;
	94	tm->from_layer = conf->from_layer;
	95	tm->to_layer = conf->to_layer;
	96	tm->config = ts_conf;
	97
	98	m->datalen = sizeof(*tm);
	99	m->data = (unsigned long) tm;
	100
	101	return 0;
	102	}
	103
	104	static void em_text_destroy(struct tcf_proto tp, struct tcf_ematch m)
	105	{
5ec1cea0 TG	106	if (EM_TEXT_PRIV(m) && EM_TEXT_PRIV(m)->config)
5ec1cea0 TG	107	textsearch_destroy(EM_TEXT_PRIV(m)->config);
d675c989 TG	108	}
	109
	110	static int em_text_dump(struct sk_buff skb, struct tcf_ematch m)
	111	{
	112	struct text_match *tm = EM_TEXT_PRIV(m);
	113	struct tcf_em_text conf;
	114
	115	strncpy(conf.algo, tm->config->ops->name, sizeof(conf.algo) - 1);
	116	conf.from_offset = tm->from_offset;
	117	conf.to_offset = tm->to_offset;
	118	conf.from_layer = tm->from_layer;
	119	conf.to_layer = tm->to_layer;
	120	conf.pattern_len = textsearch_get_pattern_len(tm->config);
	121	conf.pad = 0;
	122
add93b61 PM	123	if (nla_put_nohdr(skb, sizeof(conf), &conf) < 0)
	124	goto nla_put_failure;
	125	if (nla_append(skb, conf.pattern_len,
	126	textsearch_get_pattern(tm->config)) < 0)
	127	goto nla_put_failure;
d675c989 TG	128	return 0;
d675c989 TG	129
add93b61	130	nla_put_failure:
d675c989	131	return -1;
10297b99	132	}
d675c989 TG	133
	134	static struct tcf_ematch_ops em_text_ops = {
	135	.kind = TCF_EM_TEXT,
	136	.change = em_text_change,
	137	.match = em_text_match,
	138	.destroy = em_text_destroy,
	139	.dump = em_text_dump,
	140	.owner = THIS_MODULE,
	141	.link = LIST_HEAD_INIT(em_text_ops.link)
	142	};
	143
	144	static int __init init_em_text(void)
	145	{
	146	return tcf_em_register(&em_text_ops);
	147	}
	148
10297b99	149	static void __exit exit_em_text(void)
d675c989 TG	150	{
	151	tcf_em_unregister(&em_text_ops);
	152	}
	153
	154	MODULE_LICENSE("GPL");
	155
	156	module_init(init_em_text);
	157	module_exit(exit_em_text);
db3d99c0 PM	158
db3d99c0 PM	159	MODULE_ALIAS_TCF_EMATCH(TCF_EM_TEXT);