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authorDaniel Borkmann <daniel@iogearbox.net>2016-06-28 12:18:26 +0200
committerDavid S. Miller <davem@davemloft.net>2016-06-30 05:54:40 -0400
commit80b48c445797a634d869c7e5a53e182ba2688931 (patch)
tree18b46e8be4b541b966929a478c26c184e2ac3862 /net/core
parent6816a7ffce32e999601825ddfd887f36d3052932 (diff)
downloadlinux-80b48c445797a634d869c7e5a53e182ba2688931.tar.bz2
bpf: don't use raw processor id in generic helper
Use smp_processor_id() for the generic helper bpf_get_smp_processor_id() instead of the raw variant. This allows for preemption checks when we have DEBUG_PREEMPT, and otherwise uses the raw variant anyway. We only need to keep the raw variant for socket filters, but we can reuse the helper that is already there from cBPF side. Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/filter.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/net/core/filter.c b/net/core/filter.c
index cb9fc16cac46..46c88d9cec5c 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -150,6 +150,12 @@ static u64 __get_raw_cpu_id(u64 ctx, u64 a, u64 x, u64 r4, u64 r5)
return raw_smp_processor_id();
}
+static const struct bpf_func_proto bpf_get_raw_smp_processor_id_proto = {
+ .func = __get_raw_cpu_id,
+ .gpl_only = false,
+ .ret_type = RET_INTEGER,
+};
+
static u32 convert_skb_access(int skb_field, int dst_reg, int src_reg,
struct bpf_insn *insn_buf)
{
@@ -2037,7 +2043,7 @@ sk_filter_func_proto(enum bpf_func_id func_id)
case BPF_FUNC_get_prandom_u32:
return &bpf_get_prandom_u32_proto;
case BPF_FUNC_get_smp_processor_id:
- return &bpf_get_smp_processor_id_proto;
+ return &bpf_get_raw_smp_processor_id_proto;
case BPF_FUNC_tail_call:
return &bpf_tail_call_proto;
case BPF_FUNC_ktime_get_ns:
@@ -2086,6 +2092,8 @@ tc_cls_act_func_proto(enum bpf_func_id func_id)
return &bpf_get_route_realm_proto;
case BPF_FUNC_perf_event_output:
return bpf_get_event_output_proto();
+ case BPF_FUNC_get_smp_processor_id:
+ return &bpf_get_smp_processor_id_proto;
default:
return sk_filter_func_proto(func_id);
}