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linux/net/netfilter/nf_nat_bpf.c at master · multikernel/linux · GitHub
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// SPDX-License-Identifier: GPL-2.0-only
/* Unstable NAT Helpers for XDP and TC-BPF hook
*
* These are called from the XDP and SCHED_CLS BPF programs. Note that it is
* allowed to break compatibility for these functions since the interface they
* are exposed through to BPF programs is explicitly unstable.
*/
#include
<linux/bpf.h>
#include
<linux/btf_ids.h>
#include
<net/netfilter/nf_conntrack_bpf.h>
#include
<net/netfilter/nf_conntrack_core.h>
#include
<net/netfilter/nf_nat.h>
__bpf_kfunc_start_defs
();
/* bpf_ct_set_nat_info - Set source or destination nat address
*
* Set source or destination nat address of the newly allocated
* nf_conn before insertion. This must be invoked for referenced
* PTR_TO_BTF_ID to nf_conn___init.
*
* Parameters:
* @nfct - Pointer to referenced nf_conn object, obtained using
* bpf_xdp_ct_alloc or bpf_skb_ct_alloc.
* @addr - Nat source/destination address
* @port - Nat source/destination port. Non-positive values are
* interpreted as select a random port.
* @manip - NF_NAT_MANIP_SRC or NF_NAT_MANIP_DST
*/
__bpf_kfunc
int
bpf_ct_set_nat_info
(
struct
nf_conn___init
*
nfct
,
union
nf_inet_addr
*
addr
,
int
port
,
enum
nf_nat_manip_type
manip
)
{
struct
nf_conn
*
ct
=
(
struct
nf_conn
*
)
nfct
;
u16
proto
=
nf_ct_l3num
(
ct
);
struct
nf_nat_range2
range
;
if
(
proto
!=
NFPROTO_IPV4
&&
proto
!=
NFPROTO_IPV6
)
return
-
EINVAL
;
memset
(
&
range
,
0
,
sizeof
(
struct
nf_nat_range2
));
range
.
flags
=
NF_NAT_RANGE_MAP_IPS
;
range
.
min_addr
=
*
addr
;
range
.
max_addr
=
range
.
min_addr
;
if
(
port
>
0
) {
range
.
flags
|=
NF_NAT_RANGE_PROTO_SPECIFIED
;
range
.
min_proto
.
all
=
cpu_to_be16
(
port
);
range
.
max_proto
.
all
=
range
.
min_proto
.
all
;
}
return
nf_nat_setup_info
(
ct
,
&
range
,
manip
)
==
NF_DROP
?
-
ENOMEM
:
0
;
}
__bpf_kfunc_end_defs
();
BTF_KFUNCS_START
(
nf_nat_kfunc_set
)
BTF_ID_FLAGS
(
func
,
bpf_ct_set_nat_info
)
BTF_KFUNCS_END
(
nf_nat_kfunc_set
)
static
const
struct
btf_kfunc_id_set
nf_bpf_nat_kfunc_set
=
{
.
owner
=
THIS_MODULE
,
.
set
=
&
nf_nat_kfunc_set
,
};
int
register_nf_nat_bpf
(
void
)
{
int
ret
;
ret
=
register_btf_kfunc_id_set
(
BPF_PROG_TYPE_XDP
,
&
nf_bpf_nat_kfunc_set
);
if
(
ret
)
return
ret
;
return
register_btf_kfunc_id_set
(
BPF_PROG_TYPE_SCHED_CLS
,
&
nf_bpf_nat_kfunc_set
);
}
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