1 files changed, 145 insertions, 0 deletions

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
new file mode 100644
index 000000000000..bbfceb756452
--- /dev/null
+++ b/include/linux/bpf.h
@@ -0,0 +1,145 @@
+/* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ */
+#ifndef _LINUX_BPF_H
+#define _LINUX_BPF_H 1
+
+#include <uapi/linux/bpf.h>
+#include <linux/workqueue.h>
+#include <linux/file.h>
+
+struct bpf_map;
+
+/* map is generic key/value storage optionally accesible by eBPF programs */
+struct bpf_map_ops {
+        /* funcs callable from userspace (via syscall) */
+        struct bpf_map *(*map_alloc)(union bpf_attr *attr);
+        void (*map_free)(struct bpf_map *);
+        int (*map_get_next_key)(struct bpf_map *map, void *key, void *next_key);
+
+        /* funcs callable from userspace and from eBPF programs */
+        void *(*map_lookup_elem)(struct bpf_map *map, void *key);
+        int (*map_update_elem)(struct bpf_map *map, void *key, void *value, u64 flags);
+        int (*map_delete_elem)(struct bpf_map *map, void *key);
+};
+
+struct bpf_map {
+        atomic_t refcnt;
+        enum bpf_map_type map_type;
+        u32 key_size;
+        u32 value_size;
+        u32 max_entries;
+        struct bpf_map_ops *ops;
+        struct work_struct work;
+};
+
+struct bpf_map_type_list {
+        struct list_head list_node;
+        struct bpf_map_ops *ops;
+        enum bpf_map_type type;
+};
+
+void bpf_register_map_type(struct bpf_map_type_list *tl);
+void bpf_map_put(struct bpf_map *map);
+struct bpf_map *bpf_map_get(struct fd f);
+
+/* function argument constraints */
+enum bpf_arg_type {
+        ARG_ANYTHING = 0,       /* any argument is ok */
+
+        /* the following constraints used to prototype
+         * bpf_map_lookup/update/delete_elem() functions
+         */
+        ARG_CONST_MAP_PTR,      /* const argument used as pointer to bpf_map */
+        ARG_PTR_TO_MAP_KEY,     /* pointer to stack used as map key */
+        ARG_PTR_TO_MAP_VALUE,   /* pointer to stack used as map value */
+
+        /* the following constraints used to prototype bpf_memcmp() and other
+         * functions that access data on eBPF program stack
+         */
+        ARG_PTR_TO_STACK,       /* any pointer to eBPF program stack */
+        ARG_CONST_STACK_SIZE,   /* number of bytes accessed from stack */
+};
+
+/* type of values returned from helper functions */
+enum bpf_return_type {
+        RET_INTEGER,                    /* function returns integer */
+        RET_VOID,                       /* function doesn't return anything */
+        RET_PTR_TO_MAP_VALUE_OR_NULL,   /* returns a pointer to map elem value or NULL */
+};
+
+/* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs
+ * to in-kernel helper functions and for adjusting imm32 field in BPF_CALL
+ * instructions after verifying
+ */
+struct bpf_func_proto {
+        u64 (*func)(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
+        bool gpl_only;
+        enum bpf_return_type ret_type;
+        enum bpf_arg_type arg1_type;
+        enum bpf_arg_type arg2_type;
+        enum bpf_arg_type arg3_type;
+        enum bpf_arg_type arg4_type;
+        enum bpf_arg_type arg5_type;
+};
+
+/* bpf_context is intentionally undefined structure. Pointer to bpf_context is
+ * the first argument to eBPF programs.
+ * For socket filters: 'struct bpf_context *' == 'struct sk_buff *'
+ */
+struct bpf_context;
+
+enum bpf_access_type {
+        BPF_READ = 1,
+        BPF_WRITE = 2
+};
+
+struct bpf_verifier_ops {
+        /* return eBPF function prototype for verification */
+        const struct bpf_func_proto *(*get_func_proto)(enum bpf_func_id func_id);
+
+        /* return true if 'size' wide access at offset 'off' within bpf_context
+         * with 'type' (read or write) is allowed
+         */
+        bool (*is_valid_access)(int off, int size, enum bpf_access_type type);
+};
+
+struct bpf_prog_type_list {
+        struct list_head list_node;
+        struct bpf_verifier_ops *ops;
+        enum bpf_prog_type type;
+};
+
+void bpf_register_prog_type(struct bpf_prog_type_list *tl);
+
+struct bpf_prog;
+
+struct bpf_prog_aux {
+        atomic_t refcnt;
+        bool is_gpl_compatible;
+        enum bpf_prog_type prog_type;
+        struct bpf_verifier_ops *ops;
+        struct bpf_map **used_maps;
+        u32 used_map_cnt;
+        struct bpf_prog *prog;
+        struct work_struct work;
+};
+
+#ifdef CONFIG_BPF_SYSCALL
+void bpf_prog_put(struct bpf_prog *prog);
+#else
+static inline void bpf_prog_put(struct bpf_prog *prog) {}
+#endif
+struct bpf_prog *bpf_prog_get(u32 ufd);
+/* verify correctness of eBPF program */
+int bpf_check(struct bpf_prog *fp, union bpf_attr *attr);
+
+/* verifier prototypes for helper functions called from eBPF programs */
+extern struct bpf_func_proto bpf_map_lookup_elem_proto;
+extern struct bpf_func_proto bpf_map_update_elem_proto;
+extern struct bpf_func_proto bpf_map_delete_elem_proto;
+
+#endif /* _LINUX_BPF_H */