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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 (or any
* later) 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;
}
#define NFTNL_UDATA_FIB_RESULT 0
#define NFTNL_UDATA_FIB_FLAGS 1
#define NFTNL_UDATA_FIB_MAX 2
static int fib_expr_build_udata(struct nftnl_udata_buf *udbuf,
const struct expr *expr)
{
nftnl_udata_put_u32(udbuf, NFTNL_UDATA_FIB_RESULT, expr->fib.result);
nftnl_udata_put_u32(udbuf, NFTNL_UDATA_FIB_FLAGS, expr->fib.flags);
return 0;
}
static int fib_parse_udata(const struct nftnl_udata *attr, void *data)
{
const struct nftnl_udata **ud = data;
uint8_t type = nftnl_udata_type(attr);
uint8_t len = nftnl_udata_len(attr);
switch (type) {
case NFTNL_UDATA_FIB_RESULT:
case NFTNL_UDATA_FIB_FLAGS:
if (len != sizeof(uint32_t))
return -1;
break;
default:
return 0;
}
ud[type] = attr;
return 0;
}
static struct expr *fib_expr_parse_udata(const struct nftnl_udata *attr)
{
const struct nftnl_udata *ud[NFTNL_UDATA_FIB_MAX + 1] = {};
uint32_t flags, result;
int err;
err = nftnl_udata_parse(nftnl_udata_get(attr), nftnl_udata_len(attr),
fib_parse_udata, ud);
if (err < 0)
return NULL;
if (!ud[NFTNL_UDATA_FIB_RESULT] ||
!ud[NFTNL_UDATA_FIB_FLAGS])
return NULL;
result = nftnl_udata_get_u32(ud[NFTNL_UDATA_FIB_RESULT]);
flags = nftnl_udata_get_u32(ud[NFTNL_UDATA_FIB_FLAGS]);
return fib_expr_alloc(&internal_location, flags, result);
}
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,
.parse_udata = fib_expr_parse_udata,
.build_udata = fib_expr_build_udata,
};
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, EXPR_FIB, type,
BYTEORDER_HOST_ENDIAN, len);
expr->fib.result = result;
expr->fib.flags = flags;
return expr;
}
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