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/*
* FIB expression.
*
* Copyright (c) Red Hat GmbH. Author: Florian Westphal <fw@strlen.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <nftables.h>
#include <erec.h>
#include <expression.h>
#include <datatype.h>
#include <gmputil.h>
#include <utils.h>
#include <string.h>
#include <fib.h>
#include <linux/rtnetlink.h>
#include <net/if.h>
static const char *fib_result[NFT_FIB_RESULT_MAX + 1] = {
[NFT_FIB_RESULT_OIF] = "oif",
[NFT_FIB_RESULT_OIFNAME] = "oifname",
[NFT_FIB_RESULT_ADDRTYPE] = "type",
};
static const struct symbol_table addrtype_tbl = {
.base = BASE_DECIMAL,
.symbols = {
SYMBOL("unspec", RTN_UNSPEC),
SYMBOL("unicast", RTN_UNICAST),
SYMBOL("local", RTN_LOCAL),
SYMBOL("broadcast", RTN_BROADCAST),
SYMBOL("anycast", RTN_ANYCAST),
SYMBOL("multicast", RTN_MULTICAST),
SYMBOL("blackhole", RTN_BLACKHOLE),
SYMBOL("unreachable", RTN_UNREACHABLE),
SYMBOL("prohibit", RTN_PROHIBIT),
SYMBOL_LIST_END
}
};
const struct datatype fib_addr_type = {
.type = TYPE_FIB_ADDR,
.name = "fib_addrtype",
.desc = "fib address type",
.byteorder = BYTEORDER_HOST_ENDIAN,
.size = 4 * BITS_PER_BYTE,
.basetype = &integer_type,
.sym_tbl = &addrtype_tbl,
};
const char *fib_result_str(enum nft_fib_result result)
{
if (result <= NFT_FIB_RESULT_MAX)
return fib_result[result];
return "unknown";
}
static void __fib_expr_print_f(unsigned int *flags, unsigned int f,
const char *s, struct output_ctx *octx)
{
if ((*flags & f) == 0)
return;
nft_print(octx, "%s", s);
*flags &= ~f;
if (*flags)
nft_print(octx, " . ");
}
static void fib_expr_print(const struct expr *expr, struct output_ctx *octx)
{
unsigned int flags = expr->fib.flags & ~NFTA_FIB_F_PRESENT;
nft_print(octx, "fib ");
__fib_expr_print_f(&flags, NFTA_FIB_F_SADDR, "saddr", octx);
__fib_expr_print_f(&flags, NFTA_FIB_F_DADDR, "daddr", octx);
__fib_expr_print_f(&flags, NFTA_FIB_F_MARK, "mark", octx);
__fib_expr_print_f(&flags, NFTA_FIB_F_IIF, "iif", octx);
__fib_expr_print_f(&flags, NFTA_FIB_F_OIF, "oif", octx);
if (flags)
nft_print(octx, "0x%x", flags);
nft_print(octx, " %s", fib_result_str(expr->fib.result));
}
static bool fib_expr_cmp(const struct expr *e1, const struct expr *e2)
{
return e1->fib.result == e2->fib.result &&
e1->fib.flags == e2->fib.flags;
}
static void fib_expr_clone(struct expr *new, const struct expr *expr)
{
new->fib.result = expr->fib.result;
new->fib.flags= expr->fib.flags;
}
static const struct expr_ops fib_expr_ops = {
.type = EXPR_FIB,
.name = "fib",
.print = fib_expr_print,
.json = fib_expr_json,
.cmp = fib_expr_cmp,
.clone = fib_expr_clone,
};
struct expr *fib_expr_alloc(const struct location *loc,
unsigned int flags, unsigned int result)
{
const struct datatype *type;
unsigned int len = 4 * BITS_PER_BYTE;
struct expr *expr;
switch (result) {
case NFT_FIB_RESULT_OIF:
type = &ifindex_type;
break;
case NFT_FIB_RESULT_OIFNAME:
type = &string_type;
len = IFNAMSIZ * BITS_PER_BYTE;
break;
case NFT_FIB_RESULT_ADDRTYPE:
type = &fib_addr_type;
break;
default:
BUG("Unknown result %d\n", result);
}
if (flags & NFTA_FIB_F_PRESENT)
type = &boolean_type;
expr = expr_alloc(loc, &fib_expr_ops, type,
BYTEORDER_HOST_ENDIAN, len);
expr->fib.result = result;
expr->fib.flags = flags;
return expr;
}
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