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| author | Daniel Xu <dxu@dxuuu.xyz> | 2022-09-07 10:40:40 -0600 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2022-09-10 17:27:32 -0700 |
| commit | 864b656f82ccd433d3e38149c3673d295ad64bf6 (patch) | |
| tree | 1c4c3a628e740c3657756f4b8bc7c440bd948c84 /include/net/netfilter | |
| parent | 84c6ac417ceacd086efc330afece8922969610b7 (diff) | |
| download | lwn-864b656f82ccd433d3e38149c3673d295ad64bf6.tar.gz lwn-864b656f82ccd433d3e38149c3673d295ad64bf6.zip | |
bpf: Add support for writing to nf_conn:mark
Support direct writes to nf_conn:mark from TC and XDP prog types. This
is useful when applications want to store per-connection metadata. This
is also particularly useful for applications that run both bpf and
iptables/nftables because the latter can trivially access this metadata.
One example use case would be if a bpf prog is responsible for advanced
packet classification and iptables/nftables is later used for routing
due to pre-existing/legacy code.
Signed-off-by: Daniel Xu <dxu@dxuuu.xyz>
Link: https://lore.kernel.org/r/ebca06dea366e3e7e861c12f375a548cc4c61108.1662568410.git.dxu@dxuuu.xyz
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'include/net/netfilter')
| -rw-r--r-- | include/net/netfilter/nf_conntrack_bpf.h | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/include/net/netfilter/nf_conntrack_bpf.h b/include/net/netfilter/nf_conntrack_bpf.h index a473b56842c5..a61a93d1c6dc 100644 --- a/include/net/netfilter/nf_conntrack_bpf.h +++ b/include/net/netfilter/nf_conntrack_bpf.h @@ -3,13 +3,22 @@ #ifndef _NF_CONNTRACK_BPF_H #define _NF_CONNTRACK_BPF_H +#include <linux/bpf.h> #include <linux/btf.h> #include <linux/kconfig.h> +#include <linux/mutex.h> #if (IS_BUILTIN(CONFIG_NF_CONNTRACK) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) || \ (IS_MODULE(CONFIG_NF_CONNTRACK) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES)) extern int register_nf_conntrack_bpf(void); +extern void cleanup_nf_conntrack_bpf(void); + +extern struct mutex nf_conn_btf_access_lock; +extern int (*nfct_bsa)(struct bpf_verifier_log *log, const struct btf *btf, + const struct btf_type *t, int off, int size, + enum bpf_access_type atype, u32 *next_btf_id, + enum bpf_type_flag *flag); #else @@ -18,6 +27,20 @@ static inline int register_nf_conntrack_bpf(void) return 0; } +static inline void cleanup_nf_conntrack_bpf(void) +{ +} + +static inline int nf_conntrack_btf_struct_access(struct bpf_verifier_log *log, + const struct btf *btf, + const struct btf_type *t, int off, + int size, enum bpf_access_type atype, + u32 *next_btf_id, + enum bpf_type_flag *flag) +{ + return -EACCES; +} + #endif #endif /* _NF_CONNTRACK_BPF_H */ |