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authorDaniel Borkmann <daniel@iogearbox.net>2015-03-14 02:27:16 +0100
committerDavid S. Miller <davem@davemloft.net>2015-03-15 21:57:25 -0400
commit03e69b508b6f7c51743055c9f61d1dfeadf4b635 (patch)
tree4c9199cde0fe876871e20352666d40721d4c1d5f /net
parent12028820423bd7705beb5e09889faab95c545ea1 (diff)
downloadlinux-sh-03e69b508b6f7c51743055c9f61d1dfeadf4b635.tar.gz
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')
-rw-r--r--net/core/filter.c2
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;
}