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| author | Daniel Borkmann <daniel@iogearbox.net> | 2015-03-14 01:27:16 (GMT) |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-03-16 01:57:25 (GMT) |
| commit | 03e69b508b6f7c51743055c9f61d1dfeadf4b635 (patch) | |
| tree | 4c9199cde0fe876871e20352666d40721d4c1d5f /include | |
| parent | 12028820423bd7705beb5e09889faab95c545ea1 (diff) | |
| download | linux-03e69b508b6f7c51743055c9f61d1dfeadf4b635.tar.xz | |
ebpf: add prandom helper for packet sampling
This work is similar to commit 4cd3675ebf74 ("filter: added BPF
random opcode") and adds a possibility for packet sampling in eBPF.
Currently, this is only possible in classic BPF and useful to
combine sampling with f.e. packet sockets, possible also with tc.
Example function proto-type looks like:
u32 (*prandom_u32)(void) = (void *)BPF_FUNC_get_prandom_u32;
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/bpf.h | 2 | ||||
| -rw-r--r-- | include/uapi/linux/bpf.h | 1 |
2 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/bpf.h b/include/linux/bpf.h index 80f2e0f..50bf95e 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -154,4 +154,6 @@ extern const struct bpf_func_proto bpf_map_lookup_elem_proto; extern const struct bpf_func_proto bpf_map_update_elem_proto; extern const struct bpf_func_proto bpf_map_delete_elem_proto; +extern const struct bpf_func_proto bpf_get_prandom_u32_proto; + #endif /* _LINUX_BPF_H */ diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 3fa1af8..1c2ca2b 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -165,6 +165,7 @@ enum bpf_func_id { BPF_FUNC_map_lookup_elem, /* void *map_lookup_elem(&map, &key) */ BPF_FUNC_map_update_elem, /* int map_update_elem(&map, &key, &value, flags) */ BPF_FUNC_map_delete_elem, /* int map_delete_elem(&map, &key) */ + BPF_FUNC_get_prandom_u32, /* u32 prandom_u32(void) */ __BPF_FUNC_MAX_ID, }; |