Adding upstream version 252.22.upstream/252.22

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

1 files changed, 64 insertions, 0 deletions

diff --git a/src/shared/bpf-program.h b/src/shared/bpf-program.h
new file mode 100644
index 0000000..b640fb9
--- /dev/null
+++ b/src/shared/bpf-program.h
@@ -0,0 +1,64 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include <linux/bpf.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <sys/syscall.h>
+
+#include "fdset.h"
+#include "list.h"
+#include "macro.h"
+
+typedef struct BPFProgram BPFProgram;
+
+/* This encapsulates three different concepts: the loaded BPF program, the BPF code, and the attachment to a
+ * cgroup. Typically our BPF programs go through all three stages: we build the code, we load it, and finally
+ * we attach it, but it might happen that we operate with programs that aren't loaded or aren't attached, or
+ * where we don't have the code. */
+struct BPFProgram {
+        /* The loaded BPF program, if loaded */
+        int kernel_fd;
+        uint32_t prog_type;
+        char *prog_name;
+
+        /* The code of it BPF program, if known */
+        size_t n_instructions;
+        struct bpf_insn *instructions;
+
+        /* The cgroup path the program is attached to, if it is attached. If non-NULL bpf_program_unref()
+         * will detach on destruction. */
+        char *attached_path;
+        int attached_type;
+        uint32_t attached_flags;
+};
+
+int bpf_program_new(uint32_t prog_type, const char *prog_name, BPFProgram **ret);
+int bpf_program_new_from_bpffs_path(const char *path, BPFProgram **ret);
+BPFProgram *bpf_program_free(BPFProgram *p);
+
+int bpf_program_add_instructions(BPFProgram *p, const struct bpf_insn *insn, size_t count);
+int bpf_program_load_kernel(BPFProgram *p, char *log_buf, size_t log_size);
+int bpf_program_load_from_bpf_fs(BPFProgram *p, const char *path);
+
+int bpf_program_cgroup_attach(BPFProgram *p, int type, const char *path, uint32_t flags);
+int bpf_program_cgroup_detach(BPFProgram *p);
+
+int bpf_program_pin(int prog_fd, const char *bpffs_path);
+int bpf_program_get_id_by_fd(int prog_fd, uint32_t *ret_id);
+
+int bpf_program_serialize_attachment(FILE *f, FDSet *fds, const char *key, BPFProgram *p);
+int bpf_program_serialize_attachment_set(FILE *f, FDSet *fds, const char *key, Set *set);
+int bpf_program_deserialize_attachment(const char *v, FDSet *fds, BPFProgram **bpfp);
+int bpf_program_deserialize_attachment_set(const char *v, FDSet *fds, Set **bpfsetp);
+
+extern const struct hash_ops bpf_program_hash_ops;
+
+int bpf_map_new(enum bpf_map_type type, size_t key_size, size_t value_size, size_t max_entries, uint32_t flags);
+int bpf_map_update_element(int fd, const void *key, void *value);
+int bpf_map_lookup_element(int fd, const void *key, void *value);
+
+int bpf_cgroup_attach_type_from_string(const char *str) _pure_;
+const char *bpf_cgroup_attach_type_to_string(int attach_type) _const_;
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(BPFProgram*, bpf_program_free);