[PATCH v5 net-next 21/29] tracing: allow eBPF programs to call ktime_get_ns() and get_current()

@@ -416,6 +416,8 @@ enum bpf_func_id {
 	BPF_FUNC_memcmp,          /* int bpf_memcmp(void *unsafe_ptr, void *safe_ptr, int size) */
 	BPF_FUNC_dump_stack,      /* void bpf_dump_stack(void) */
 	BPF_FUNC_printk,          /* int bpf_printk(const char *fmt, int fmt_size, ...) */
+	BPF_FUNC_ktime_get_ns,    /* u64 bpf_ktime_get_ns(void) */
+	BPF_FUNC_get_current,     /* struct task_struct *bpf_get_current(void) */
 	__BPF_FUNC_MAX_ID,
 };
 

@@ -114,6 +114,16 @@ static u64 bpf_printk(u64 r1, u64 fmt_size, u64 r3, u64 r4, u64 r5)
 			      mod_l[2] ? r5 : (u32) r5);
 }
 
+static u64 bpf_ktime_get_ns(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5)
+{
+	return ktime_get_ns();
+}
+
+static u64 bpf_get_current(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5)
+{
+	return (u64) (long) current;
+}
+
 static struct bpf_func_proto tracing_filter_funcs[] = {
 #define FETCH(SIZE)				\
 	[BPF_FUNC_fetch_##SIZE] = {		\

@@ -169,6 +179,16 @@ static struct bpf_func_proto tracing_filter_funcs[] = {
 		.arg1_type = ARG_CONST_MAP_PTR,
 		.arg2_type = ARG_PTR_TO_MAP_KEY,
 	},
+	[BPF_FUNC_ktime_get_ns] = {
+		.func = bpf_ktime_get_ns,
+		.gpl_only = true,
+		.ret_type = RET_INTEGER,
+	},
+	[BPF_FUNC_get_current] = {
+		.func = bpf_get_current,
+		.gpl_only = true,
+		.ret_type = RET_INTEGER,
+	},
 };
 
 static const struct bpf_func_proto *tracing_filter_func_proto(enum bpf_func_id func_id)