diff options
| author | Joanne Koong <joannelkoong@gmail.com> | 2022-05-24 00:07:08 +0300 |
|---|---|---|
| committer | Andrii Nakryiko <andrii@kernel.org> | 2022-05-24 00:31:24 +0300 |
| commit | 263ae152e96253f40c2c276faad8629e096b3bad (patch) | |
| tree | 85bd51d3eaedd4ea9e10f886f7c2d145d3f25246 /include | |
| parent | 97e03f521050c092919591e668107b3d69c5f426 (diff) | |
| download | linux-263ae152e96253f40c2c276faad8629e096b3bad.tar.xz | |
bpf: Add bpf_dynptr_from_mem for local dynptrs
This patch adds a new api bpf_dynptr_from_mem:
long bpf_dynptr_from_mem(void *data, u32 size, u64 flags, struct bpf_dynptr *ptr);
which initializes a dynptr to point to a bpf program's local memory. For now
only local memory that is of reg type PTR_TO_MAP_VALUE is supported.
Signed-off-by: Joanne Koong <joannelkoong@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20220523210712.3641569-3-joannelkoong@gmail.com
Diffstat (limited to 'include')
| -rw-r--r-- | include/uapi/linux/bpf.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 610944cb3389..9be3644457dd 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -5178,6 +5178,17 @@ union bpf_attr { * Dynamically cast a *sk* pointer to a *mptcp_sock* pointer. * Return * *sk* if casting is valid, or **NULL** otherwise. + * + * long bpf_dynptr_from_mem(void *data, u32 size, u64 flags, struct bpf_dynptr *ptr) + * Description + * Get a dynptr to local memory *data*. + * + * *data* must be a ptr to a map value. + * The maximum *size* supported is DYNPTR_MAX_SIZE. + * *flags* is currently unused. + * Return + * 0 on success, -E2BIG if the size exceeds DYNPTR_MAX_SIZE, + * -EINVAL if flags is not 0. */ #define __BPF_FUNC_MAPPER(FN) \ FN(unspec), \ @@ -5377,6 +5388,7 @@ union bpf_attr { FN(kptr_xchg), \ FN(map_lookup_percpu_elem), \ FN(skc_to_mptcp_sock), \ + FN(dynptr_from_mem), \ /* */ /* integer value in 'imm' field of BPF_CALL instruction selects which helper |