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>

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 5f520f5..ca854e5 100644 (file)
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -186,5 +186,6 @@ extern const struct bpf_func_proto bpf_map_delete_elem_proto;
 extern const struct bpf_func_proto bpf_get_prandom_u32_proto;
 extern const struct bpf_func_proto bpf_get_smp_processor_id_proto;
 extern const struct bpf_func_proto bpf_tail_call_proto;
+extern const struct bpf_func_proto bpf_ktime_get_ns_proto;
 
 #endif /* _LINUX_BPF_H */

diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index d44b25c..4548422 100644 (file)
--- 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 bd7f598..b3aaabd 100644 (file)
--- 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,
+};

diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 646445e..50c4015 100644 (file)
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -79,18 +79,6 @@ static const struct bpf_func_proto bpf_probe_read_proto = {
        .arg3_type      = ARG_ANYTHING,
 };
 
-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();
-}
-
-static const struct bpf_func_proto bpf_ktime_get_ns_proto = {
-       .func           = bpf_ktime_get_ns,
-       .gpl_only       = true,
-       .ret_type       = RET_INTEGER,
-};
-
 /*
  * limited trace_printk()
  * only %d %u %x %ld %lu %lx %lld %llu %llx %p conversion specifiers allowed

diff --git a/net/core/filter.c b/net/core/filter.c
index 2c30d66..b78a010 100644 (file)
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -1423,6 +1423,8 @@ sk_filter_func_proto(enum bpf_func_id func_id)
                return &bpf_get_smp_processor_id_proto;
        case BPF_FUNC_tail_call:
                return &bpf_tail_call_proto;
+       case BPF_FUNC_ktime_get_ns:
+               return &bpf_ktime_get_ns_proto;
        default:
                return NULL;
        }