diff options
| author | Chema Gonzalez <chema@google.com> | 2014-04-21 09:21:24 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-04-22 21:27:57 -0400 |
| commit | 4cd3675ebf74d7f559038ded6aa8088e4099a83d (patch) | |
| tree | 6988d7dc3352fbcce10c5c510ffa11e6f30217de /tools/net/bpf_exp.l | |
| parent | 5a4ae5f6e7d4b2b5a9b8981d513345053e40b6ac (diff) | |
filter: added BPF random opcode
Added a new ancillary load (bpf call in eBPF parlance) that produces
a 32-bit random number. We are implementing it as an ancillary load
(instead of an ISA opcode) because (a) it is simpler, (b) allows easy
JITing, and (c) seems more in line with generic ISAs that do not have
"get a random number" as a instruction, but as an OS call.
The main use for this ancillary load is to perform random packet sampling.
Signed-off-by: Chema Gonzalez <chema@google.com>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Acked-by: Daniel Borkmann <dborkman@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'tools/net/bpf_exp.l')
| -rw-r--r-- | tools/net/bpf_exp.l | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/net/bpf_exp.l b/tools/net/bpf_exp.l index bf7be77ddd62..833a96611da6 100644 --- a/tools/net/bpf_exp.l +++ b/tools/net/bpf_exp.l @@ -92,6 +92,7 @@ extern void yyerror(const char *str); "#"?("cpu") { return K_CPU; } "#"?("vlan_tci") { return K_VLANT; } "#"?("vlan_pr") { return K_VLANP; } +"#"?("rand") { return K_RAND; } ":" { return ':'; } "," { return ','; } |