Merging upstream version 1.29.0.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 105 insertions, 0 deletions

diff --git a/libnetdata/ebpf/ebpf.h b/libnetdata/ebpf/ebpf.h
new file mode 100644
index 000000000..d4faccffd
--- /dev/null
+++ b/libnetdata/ebpf/ebpf.h
@@ -0,0 +1,105 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef NETDATA_EBPF_H
+#define NETDATA_EBPF_H 1
+
+#include <bpf/bpf.h>
+#include <bpf/libbpf.h>
+
+#define NETDATA_DEBUGFS "/sys/kernel/debug/tracing/"
+
+/**
+ * The next magic number is got doing the following math:
+ *  294960 = 4*65536 + 11*256 + 0
+ *
+ *  For more details, please, read /usr/include/linux/version.h
+ */
+#define NETDATA_MINIMUM_EBPF_KERNEL 264960
+
+/**
+ * The RedHat magic number was got doing:
+ *
+ * 1797 = 7*256 + 5
+ *
+ *  For more details, please, read /usr/include/linux/version.h
+ *  in any Red Hat installation.
+ */
+#define NETDATA_MINIMUM_RH_VERSION 1797
+
+/**
+ * 2048 = 8*256 + 0
+ */
+#define NETDATA_RH_8 2048
+
+/**
+ *  Kernel 5.10
+ *
+ *  330240 = 5*65536 + 10*256
+ */
+#define NETDATA_EBPF_KERNEL_5_10 330240
+
+/**
+ *  Kernel 4.17
+ *
+ *  266496 = 4*65536 + 17*256
+ */
+#define NETDATA_EBPF_KERNEL_4_17 266496
+
+/**
+ *  Kernel 4.15
+ *
+ *  265984 = 4*65536 + 15*256
+ */
+#define NETDATA_EBPF_KERNEL_4_15 265984
+
+/**
+ *  Kernel 4.11
+ *
+ *  264960 = 4*65536 + 15*256
+ */
+#define NETDATA_EBPF_KERNEL_4_11 264960
+
+#define VERSION_STRING_LEN 256
+#define EBPF_KERNEL_REJECT_LIST_FILE "ebpf_kernel_reject_list.txt"
+
+typedef struct ebpf_data {
+    int *map_fd;
+
+    char *kernel_string;
+    uint32_t running_on_kernel;
+    int isrh;
+} ebpf_data_t;
+
+typedef enum {
+    MODE_RETURN = 0, // This attaches kprobe when the function returns
+    MODE_DEVMODE,    // This stores log given description about the errors raised
+    MODE_ENTRY       // This attaches kprobe when the function is called
+} netdata_run_mode_t;
+
+typedef struct ebpf_module {
+    const char *thread_name;
+    const char *config_name;
+    int enabled;
+    void *(*start_routine)(void *);
+    int update_time;
+    int global_charts;
+    int apps_charts;
+    netdata_run_mode_t mode;
+    uint32_t thread_id;
+    int optional;
+} ebpf_module_t;
+
+#define NETDATA_MAX_PROBES 64
+
+extern int get_kernel_version(char *out, int size);
+extern int get_redhat_release();
+extern int has_condition_to_run(int version);
+extern char *ebpf_kernel_suffix(int version, int isrh);
+extern int ebpf_update_kernel(ebpf_data_t *ef);
+extern struct bpf_link **ebpf_load_program(char *plugins_dir,
+                             ebpf_module_t *em,
+                             char *kernel_string,
+                             struct bpf_object **obj,
+                             int *map_fd);
+
+#endif /* NETDATA_EBPF_H */