diff options
| author | John Fastabend <john.fastabend@gmail.com> | 2018-10-19 19:56:50 -0700 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2018-10-20 21:37:12 +0200 |
| commit | f908d26b2c41d9a924371099c4979e4b5d385165 (patch) | |
| tree | da4325dd974dcb244f295b4a4935b597a6d1587a /tools/include | |
| parent | 6fff607e2f14bd7c63c06c464a6f93b8efbabe28 (diff) | |
| download | linux-f908d26b2c41d9a924371099c4979e4b5d385165.tar.bz2 | |
bpf: libbpf support for msg_push_data
Add support for new bpf_msg_push_data in libbpf.
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'tools/include')
| -rw-r--r-- | tools/include/uapi/linux/bpf.h | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h index a2fb333290dc..852dc17ab47a 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -2240,6 +2240,23 @@ union bpf_attr { * pointer that was returned from bpf_sk_lookup_xxx\ (). * Return * 0 on success, or a negative error in case of failure. + * + * int bpf_msg_push_data(struct sk_buff *skb, u32 start, u32 len, u64 flags) + * Description + * For socket policies, insert *len* bytes into msg at offset + * *start*. + * + * If a program of type **BPF_PROG_TYPE_SK_MSG** is run on a + * *msg* it may want to insert metadata or options into the msg. + * This can later be read and used by any of the lower layer BPF + * hooks. + * + * This helper may fail if under memory pressure (a malloc + * fails) in these cases BPF programs will get an appropriate + * error and BPF programs will need to handle them. + * + * Return + * 0 on success, or a negative error in case of failure. */ #define __BPF_FUNC_MAPPER(FN) \ FN(unspec), \ @@ -2331,7 +2348,8 @@ union bpf_attr { FN(sk_release), \ FN(map_push_elem), \ FN(map_pop_elem), \ - FN(map_peek_elem), + FN(map_peek_elem), \ + FN(msg_push_data), /* integer value in 'imm' field of BPF_CALL instruction selects which helper * function eBPF program intends to call |