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/* SPDX-License-Identifier: LGPL-2.1-only */
/*
* Copyright (c) 2008-2013 Thomas Graf <tgraf@suug.ch>
*/
/**
* @ingroup ematch
* @defgroup em_cmp Simple packet data comparison
*
* @{
*/
#include <netlink-private/netlink.h>
#include <netlink-private/tc.h>
#include <netlink/netlink.h>
#include <netlink/route/cls/ematch.h>
#include <netlink/route/cls/ematch/cmp.h>
#include <linux/tc_ematch/tc_em_cmp.h>
void rtnl_ematch_cmp_set(struct rtnl_ematch *e, struct tcf_em_cmp *cfg)
{
memcpy(rtnl_ematch_data(e), cfg, sizeof(*cfg));
}
struct tcf_em_cmp *rtnl_ematch_cmp_get(struct rtnl_ematch *e)
{
return rtnl_ematch_data(e);
}
static int cmp_parse(struct rtnl_ematch *e, void *data, size_t len)
{
memcpy(rtnl_ematch_data(e), data, len);
return 0;
}
static const char *align_txt[] = {
[TCF_EM_ALIGN_U8] = "u8",
[TCF_EM_ALIGN_U16] = "u16",
[TCF_EM_ALIGN_U32] = "u32"
};
static const char *layer_txt[] = {
[TCF_LAYER_LINK] = "eth",
[TCF_LAYER_NETWORK] = "ip",
[TCF_LAYER_TRANSPORT] = "tcp"
};
static const char *operand_txt[] = {
[TCF_EM_OPND_EQ] = "=",
[TCF_EM_OPND_LT] = "<",
[TCF_EM_OPND_GT] = ">",
};
static void cmp_dump(struct rtnl_ematch *e, struct nl_dump_params *p)
{
struct tcf_em_cmp *cmp = rtnl_ematch_data(e);
if (cmp->flags & TCF_EM_CMP_TRANS)
nl_dump(p, "ntoh%c(", (cmp->align == TCF_EM_ALIGN_U32) ? 'l' : 's');
nl_dump(p, "%s at %s+%u",
align_txt[cmp->align], layer_txt[cmp->layer], cmp->off);
if (cmp->mask)
nl_dump(p, " & 0x%x", cmp->mask);
if (cmp->flags & TCF_EM_CMP_TRANS)
nl_dump(p, ")");
nl_dump(p, " %s %u", operand_txt[cmp->opnd], cmp->val);
}
static struct rtnl_ematch_ops cmp_ops = {
.eo_kind = TCF_EM_CMP,
.eo_name = "cmp",
.eo_minlen = sizeof(struct tcf_em_cmp),
.eo_datalen = sizeof(struct tcf_em_cmp),
.eo_parse = cmp_parse,
.eo_dump = cmp_dump,
};
static void __init cmp_init(void)
{
rtnl_ematch_register(&cmp_ops);
}
/** @} */
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