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bpf: Add support for passing mark with bpf_fib_lookup

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Extend the bpf_fib_lookup() helper by making it to utilize mark if
the BPF_FIB_LOOKUP_MARK flag is set. In order to pass the mark the
four bytes of struct bpf_fib_lookup are used, shared with the
output-only smac/dmac fields.

Signed-off-by: Anton Protopopov <aspsk@isovalent.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Reviewed-by: David Ahern <dsahern@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20240326101742.17421-2-aspsk@isovalent.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Anton Protopopov
2024-03-26 10:17:40 +00:00
committed by Andrii Nakryiko
parent 8a2054f417
commit 89d8cdf741
1 changed files with 18 additions and 2 deletions
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20
include/uapi/linux/bpf.h
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@@ -3394,6 +3394,10 @@ union bpf_attr {
* for the nexthop. If the src addr cannot be derived,
* **BPF_FIB_LKUP_RET_NO_SRC_ADDR** is returned. In this
* case, *params*->dmac and *params*->smac are not set either.
* **BPF_FIB_LOOKUP_MARK**
* Use the mark present in *params*->mark for the fib lookup.
* This option should not be used with BPF_FIB_LOOKUP_DIRECT,
* as it only has meaning for full lookups.
*
* *ctx* is either **struct xdp_md** for XDP programs or
* **struct sk_buff** tc cls_act programs.
@@ -7120,6 +7124,7 @@ enum {
BPF_FIB_LOOKUP_SKIP_NEIGH = (1U << 2),
BPF_FIB_LOOKUP_TBID = (1U << 3),
BPF_FIB_LOOKUP_SRC = (1U << 4),
BPF_FIB_LOOKUP_MARK = (1U << 5),
};
enum {
@@ -7197,8 +7202,19 @@ struct bpf_fib_lookup {
__u32 tbid;
};
__u8 smac[6]; /* ETH_ALEN */
__u8 dmac[6]; /* ETH_ALEN */
union {
/* input */
struct {
__u32 mark; /* policy routing */
/* 2 4-byte holes for input */
};
/* output: source and dest mac */
struct {
__u8 smac[6]; /* ETH_ALEN */
__u8 dmac[6]; /* ETH_ALEN */
};
};
};
struct bpf_redir_neigh {