155 lines
3.6 KiB
C
155 lines
3.6 KiB
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/config.h>
|
|
#include <linux/module.h>
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.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)
|
|
{
|
|
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;
|
|
|
|
RTA_PUT_NOHDR(skb, sizeof(conf), &conf);
|
|
RTA_APPEND(skb, conf.pattern_len, textsearch_get_pattern(tm->config));
|
|
return 0;
|
|
|
|
rtattr_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);
|