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netfilter: nfnetlink hook: dump bpf prog id

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This allows userspace ("nft list hooks") to show which bpf program
is attached to which hook.

Without this, user only knows bpf prog is attached at prio
x, y, z at INPUT and FORWARD, but can't tell which program is where.

v4: kdoc fixups (Simon Horman)

Link: https://lore.kernel.org/bpf/ZEELzpNCnYJuZyod@corigine.com/
Signed-off-by: Florian Westphal <fw@strlen.de>
Link: https://lore.kernel.org/r/20230421170300.24115-4-fw@strlen.de
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Florian Westphal 2023-04-21 19:02:56 +02:00 • committed by Alexei Starovoitov
parent fd9c663b9a
commit 506a74db7e
2 changed files with 89 additions and 16 deletions
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24
include/uapi/linux/netfilter/nfnetlink_hook.h
View file

@ -32,8 +32,12 @@ enum nfnl_hook_attributes {
/**
* enum nfnl_hook_chain_info_attributes - chain description
*
* NFNLA_HOOK_INFO_DESC: nft chain and table name (enum nft_table_attributes) (NLA_NESTED)
* NFNLA_HOOK_INFO_TYPE: chain type (enum nfnl_hook_chaintype) (NLA_U32)
* @NFNLA_HOOK_INFO_DESC: nft chain and table name (NLA_NESTED)
* @NFNLA_HOOK_INFO_TYPE: chain type (enum nfnl_hook_chaintype) (NLA_U32)
*
* NFNLA_HOOK_INFO_DESC depends on NFNLA_HOOK_INFO_TYPE value:
* NFNL_HOOK_TYPE_NFTABLES: enum nft_table_attributes
* NFNL_HOOK_TYPE_BPF: enum nfnl_hook_bpf_attributes
*/
enum nfnl_hook_chain_info_attributes {
NFNLA_HOOK_INFO_UNSPEC,
@ -55,10 +59,24 @@ enum nfnl_hook_chain_desc_attributes {
/**
* enum nfnl_hook_chaintype - chain type
*
* @NFNL_HOOK_TYPE_NFTABLES nf_tables base chain
* @NFNL_HOOK_TYPE_NFTABLES: nf_tables base chain
* @NFNL_HOOK_TYPE_BPF: bpf program
*/
enum nfnl_hook_chaintype {
NFNL_HOOK_TYPE_NFTABLES = 0x1,
NFNL_HOOK_TYPE_BPF,
};
/**
* enum nfnl_hook_bpf_attributes - bpf prog description
*
* @NFNLA_HOOK_BPF_ID: bpf program id (NLA_U32)
*/
enum nfnl_hook_bpf_attributes {
NFNLA_HOOK_BPF_UNSPEC,
NFNLA_HOOK_BPF_ID,
__NFNLA_HOOK_BPF_MAX,
};
#define NFNLA_HOOK_BPF_MAX (__NFNLA_HOOK_BPF_MAX - 1)
#endif /* _NFNL_HOOK_H */