New upstream version 249~rc1

[systemd.git] / src / shared / bpf-program.h

diff --git a/src/shared/bpf-program.h b/src/shared/bpf-program.h
index eef77f9d8e1a6dde7c7be9bf836ce8f9eabc3998..908af1a1b2a12001738c885d65f687df3cfcc3c1 100644 (file)
--- a/src/shared/bpf-program.h
+++ b/src/shared/bpf-program.h
@@ -3,31 +3,41 @@
 
 #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 {
         unsigned n_ref;
 
+        /* The loaded BPF program, if loaded */
         int kernel_fd;
         uint32_t prog_type;
 
+        /* The code of it BPF program, if known */
         size_t n_instructions;
-        size_t allocated;
         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, BPFProgram **ret);
-BPFProgram *bpf_program_unref(BPFProgram *p);
+int bpf_program_new_from_bpffs_path(const char *path, BPFProgram **ret);
 BPFProgram *bpf_program_ref(BPFProgram *p);
+BPFProgram *bpf_program_unref(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);
@@ -36,8 +46,21 @@ 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_unref);