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| author |   Daniel Borkmann <daniel@iogearbox.net> | 2015-03-14 02:27:16 +0100 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2015-03-15 21:57:25 -0400 |
| commit | 03e69b508b6f7c51743055c9f61d1dfeadf4b635 (patch) | |
| tree | 4c9199cde0fe876871e20352666d40721d4c1d5f /net/core/filter.c | |
| parent | Merge branch 'gianfar-next' (diff) | |
| download | linux-dev-03e69b508b6f7c51743055c9f61d1dfeadf4b635.tar.xz linux-dev-03e69b508b6f7c51743055c9f61d1dfeadf4b635.zip | |
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 'net/core/filter.c')
| -rw-r--r-- | net/core/filter.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/net/core/filter.c b/net/core/filter.c index 7a4eb7030dba..4344db39af2e 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -1139,6 +1139,8 @@ sk_filter_func_proto(enum bpf_func_id func_id) return &bpf_map_update_elem_proto; case BPF_FUNC_map_delete_elem: return &bpf_map_delete_elem_proto; + case BPF_FUNC_get_prandom_u32: + return &bpf_get_prandom_u32_proto; default: return NULL; } |