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bpf: add bpf_ktime_get_boot_ns()
On a device like a cellphone which is constantly suspending and resuming CLOCK_MONOTONIC is not particularly useful for keeping track of or reacting to external network events. Instead you want to use CLOCK_BOOTTIME. Hence add bpf_ktime_get_boot_ns() as a mirror of bpf_ktime_get_ns() based around CLOCK_BOOTTIME instead of CLOCK_MONOTONIC. Signed-off-by: Maciej Żenczykowski <maze@google.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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@ -652,6 +652,8 @@ union bpf_attr {
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* u64 bpf_ktime_get_ns(void)
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* Description
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* Return the time elapsed since system boot, in nanoseconds.
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* Does not include time the system was suspended.
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* See: clock_gettime(CLOCK_MONOTONIC)
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* Return
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* Current *ktime*.
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*
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@ -3025,6 +3027,14 @@ union bpf_attr {
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* * **-EOPNOTSUPP** Unsupported operation, for example a
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* call from outside of TC ingress.
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* * **-ESOCKTNOSUPPORT** Socket type not supported (reuseport).
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*
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* u64 bpf_ktime_get_boot_ns(void)
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* Description
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* Return the time elapsed since system boot, in nanoseconds.
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* Does include the time the system was suspended.
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* See: clock_gettime(CLOCK_BOOTTIME)
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* Return
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* Current *ktime*.
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*/
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#define __BPF_FUNC_MAPPER(FN) \
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FN(unspec), \
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@ -3151,7 +3161,8 @@ union bpf_attr {
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FN(xdp_output), \
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FN(get_netns_cookie), \
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FN(get_current_ancestor_cgroup_id), \
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FN(sk_assign),
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FN(sk_assign), \
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FN(ktime_get_boot_ns),
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/* integer value in 'imm' field of BPF_CALL instruction selects which helper
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* function eBPF program intends to call
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