path: root/kernel/bpf/core.c
diff options
authorAlexei Starovoitov <>2014-10-23 18:41:08 -0700
committerDavid S. Miller <>2014-10-27 19:09:59 -0400
commitf89b7755f517cdbb755d7543eef986ee9d54e654 (patch)
treebf491bea6418b0442900d864237e0028f7c35162 /kernel/bpf/core.c
parent8ae3c911b9efcca653c552a9c74957a6cb04a87d (diff)
bpf: split eBPF out of NET
introduce two configs: - hidden CONFIG_BPF to select eBPF interpreter that classic socket filters depend on - visible CONFIG_BPF_SYSCALL (default off) that tracing and sockets can use that solves several problems: - tracing and others that wish to use eBPF don't need to depend on NET. They can use BPF_SYSCALL to allow loading from userspace or select BPF to use it directly from kernel in NET-less configs. - in 3.18 programs cannot be attached to events yet, so don't force it on - when the rest of eBPF infra is there in 3.19+, it's still useful to switch it off to minimize kernel size bloat-o-meter on x64 shows: add/remove: 0/60 grow/shrink: 0/2 up/down: 0/-15601 (-15601) tested with many different config combinations. Hopefully didn't miss anything. Signed-off-by: Alexei Starovoitov <> Acked-by: Daniel Borkmann <> Signed-off-by: David S. Miller <>
Diffstat (limited to 'kernel/bpf/core.c')
1 files changed, 9 insertions, 0 deletions
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index f0c30c59b317..d6594e457a25 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -655,3 +655,12 @@ void bpf_prog_free(struct bpf_prog *fp)
+/* To execute LD_ABS/LD_IND instructions __bpf_prog_run() may call
+ * skb_copy_bits(), so provide a weak definition of it for NET-less config.
+ */
+int __weak skb_copy_bits(const struct sk_buff *skb, int offset, void *to,
+ int len)
+ return -EFAULT;