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/* SPDX-License-Identifier: LGPL-2.1-only */
/*
* Copyright (c) 2010-2013 Thomas Graf <tgraf@suug.ch>
*/
/**
* @ingroup ematch
* @defgroup em_text Text Search
*
* @{
*/
#include <netlink-private/netlink.h>
#include <netlink-private/utils.h>
#include <netlink-private/tc.h>
#include <netlink/netlink.h>
#include <netlink/route/cls/ematch.h>
#include <netlink/route/cls/ematch/text.h>
#include <linux/tc_ematch/tc_em_text.h>
struct text_data
{
struct tcf_em_text cfg;
char * pattern;
};
void rtnl_ematch_text_set_from(struct rtnl_ematch *e, uint8_t layer,
uint16_t offset)
{
struct text_data *t = rtnl_ematch_data(e);
t->cfg.from_offset = offset;
t->cfg.from_layer = layer;
}
uint16_t rtnl_ematch_text_get_from_offset(struct rtnl_ematch *e)
{
return ((struct text_data *) rtnl_ematch_data(e))->cfg.from_offset;
}
uint8_t rtnl_ematch_text_get_from_layer(struct rtnl_ematch *e)
{
return ((struct text_data *) rtnl_ematch_data(e))->cfg.from_layer;
}
void rtnl_ematch_text_set_to(struct rtnl_ematch *e, uint8_t layer,
uint16_t offset)
{
struct text_data *t = rtnl_ematch_data(e);
t->cfg.to_offset = offset;
t->cfg.to_layer = layer;
}
uint16_t rtnl_ematch_text_get_to_offset(struct rtnl_ematch *e)
{
return ((struct text_data *) rtnl_ematch_data(e))->cfg.to_offset;
}
uint8_t rtnl_ematch_text_get_to_layer(struct rtnl_ematch *e)
{
return ((struct text_data *) rtnl_ematch_data(e))->cfg.to_layer;
}
void rtnl_ematch_text_set_pattern(struct rtnl_ematch *e,
char *pattern, size_t len)
{
struct text_data *t = rtnl_ematch_data(e);
if (t->pattern)
free(t->pattern);
t->pattern = pattern;
t->cfg.pattern_len = len;
}
char *rtnl_ematch_text_get_pattern(struct rtnl_ematch *e)
{
return ((struct text_data *) rtnl_ematch_data(e))->pattern;
}
size_t rtnl_ematch_text_get_len(struct rtnl_ematch *e)
{
return ((struct text_data *) rtnl_ematch_data(e))->cfg.pattern_len;
}
void rtnl_ematch_text_set_algo(struct rtnl_ematch *e, const char *algo)
{
struct text_data *t = rtnl_ematch_data(e);
_nl_strncpy_trunc(t->cfg.algo, algo, sizeof(t->cfg.algo));
}
char *rtnl_ematch_text_get_algo(struct rtnl_ematch *e)
{
struct text_data *t = rtnl_ematch_data(e);
return t->cfg.algo[0] ? t->cfg.algo : NULL;
}
static int text_parse(struct rtnl_ematch *e, void *data, size_t len)
{
struct text_data *t = rtnl_ematch_data(e);
size_t hdrlen = sizeof(struct tcf_em_text);
size_t plen = len - hdrlen;
memcpy(&t->cfg, data, hdrlen);
if (t->cfg.pattern_len > plen)
return -NLE_INVAL;
if (t->cfg.pattern_len > 0) {
if (!(t->pattern = calloc(1, t->cfg.pattern_len)))
return -NLE_NOMEM;
memcpy(t->pattern, (char *) data + hdrlen, t->cfg.pattern_len);
}
return 0;
}
static void text_dump(struct rtnl_ematch *e, struct nl_dump_params *p)
{
struct text_data *t = rtnl_ematch_data(e);
char buf[64];
nl_dump(p, "text(%s \"%s\"",
t->cfg.algo[0] ? t->cfg.algo : "no-algo",
t->pattern ? t->pattern : "no-pattern");
if (t->cfg.from_layer || t->cfg.from_offset) {
nl_dump(p, " from %s",
rtnl_ematch_offset2txt(t->cfg.from_layer,
t->cfg.from_offset,
buf, sizeof(buf)));
}
if (t->cfg.to_layer || t->cfg.to_offset) {
nl_dump(p, " to %s",
rtnl_ematch_offset2txt(t->cfg.to_layer,
t->cfg.to_offset,
buf, sizeof(buf)));
}
nl_dump(p, ")");
}
static int text_fill(struct rtnl_ematch *e, struct nl_msg *msg)
{
struct text_data *t = rtnl_ematch_data(e);
int err;
if ((err = nlmsg_append(msg, &t->cfg, sizeof(t->cfg), 0)) < 0)
return err;
return nlmsg_append(msg, t->pattern, t->cfg.pattern_len, 0);
}
static void text_free(struct rtnl_ematch *e)
{
struct text_data *t = rtnl_ematch_data(e);
free(t->pattern);
}
static struct rtnl_ematch_ops text_ops = {
.eo_kind = TCF_EM_TEXT,
.eo_name = "text",
.eo_minlen = sizeof(struct tcf_em_text),
.eo_datalen = sizeof(struct text_data),
.eo_parse = text_parse,
.eo_dump = text_dump,
.eo_fill = text_fill,
.eo_free = text_free,
};
static void __init text_init(void)
{
rtnl_ematch_register(&text_ops);
}
/** @} */
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