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| author | Daniel Borkmann <daniel@iogearbox.net> | 2015-05-29 23:23:06 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-05-31 21:44:44 -0700 |
| commit | 17ca8cbf49be3aa94bb1c2b7ee6545fd70094eb4 (patch) | |
| tree | 100f160426a26857a776c4b3fd3beb8848bda474 /kernel/bpf | |
| parent | a24c85abc0815c14d9e5266d06b9acd8a0a57b9a (diff) | |
| download | linux-17ca8cbf49be3aa94bb1c2b7ee6545fd70094eb4.tar.bz2 | |
ebpf: allow bpf_ktime_get_ns_proto also for networking
As this is already exported from tracing side via commit d9847d310ab4
("tracing: Allow BPF programs to call bpf_ktime_get_ns()"), we might
as well want to move it to the core, so also networking users can make
use of it, e.g. to measure diffs for certain flows from ingress/egress.
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Ingo Molnar <mingo@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'kernel/bpf')
| -rw-r--r-- | kernel/bpf/core.c | 1 | ||||
| -rw-r--r-- | kernel/bpf/helpers.c | 13 |
2 files changed, 14 insertions, 0 deletions
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c index d44b25cbe460..4548422d5f6c 100644 --- a/kernel/bpf/core.c +++ b/kernel/bpf/core.c @@ -734,6 +734,7 @@ const struct bpf_func_proto bpf_map_delete_elem_proto __weak; const struct bpf_func_proto bpf_get_prandom_u32_proto __weak; const struct bpf_func_proto bpf_get_smp_processor_id_proto __weak; +const struct bpf_func_proto bpf_ktime_get_ns_proto __weak; /* 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. diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c index bd7f5988ed9c..b3aaabdf9a50 100644 --- a/kernel/bpf/helpers.c +++ b/kernel/bpf/helpers.c @@ -13,6 +13,7 @@ #include <linux/rcupdate.h> #include <linux/random.h> #include <linux/smp.h> +#include <linux/ktime.h> /* If kernel subsystem is allowing eBPF programs to call this function, * inside its own verifier_ops->get_func_proto() callback it should return @@ -111,3 +112,15 @@ const struct bpf_func_proto bpf_get_smp_processor_id_proto = { .gpl_only = false, .ret_type = RET_INTEGER, }; + +static u64 bpf_ktime_get_ns(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5) +{ + /* NMI safe access to clock monotonic */ + return ktime_get_mono_fast_ns(); +} + +const struct bpf_func_proto bpf_ktime_get_ns_proto = { + .func = bpf_ktime_get_ns, + .gpl_only = true, + .ret_type = RET_INTEGER, +}; |