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-rw-r--r--include/bpf_util.h283
1 files changed, 283 insertions, 0 deletions
diff --git a/include/bpf_util.h b/include/bpf_util.h
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--- /dev/null
+++ b/include/bpf_util.h
@@ -0,0 +1,283 @@
+/*
+ * bpf_util.h BPF common code
+ *
+ * This program is free software; you can distribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Authors: Daniel Borkmann <daniel@iogearbox.net>
+ * Jiri Pirko <jiri@resnulli.us>
+ */
+
+#ifndef __BPF_UTIL__
+#define __BPF_UTIL__
+
+#include <linux/bpf.h>
+#include <linux/filter.h>
+#include <linux/magic.h>
+#include <linux/elf-em.h>
+#include <linux/if_alg.h>
+
+#include "utils.h"
+#include "bpf_scm.h"
+
+#define BPF_ENV_UDS "TC_BPF_UDS"
+#define BPF_ENV_MNT "TC_BPF_MNT"
+
+#ifndef BPF_MAX_LOG
+# define BPF_MAX_LOG 4096
+#endif
+
+#define BPF_DIR_GLOBALS "globals"
+
+#ifndef BPF_FS_MAGIC
+# define BPF_FS_MAGIC 0xcafe4a11
+#endif
+
+#define BPF_DIR_MNT "/sys/fs/bpf"
+
+#ifndef TRACEFS_MAGIC
+# define TRACEFS_MAGIC 0x74726163
+#endif
+
+#define TRACE_DIR_MNT "/sys/kernel/tracing"
+
+#ifndef AF_ALG
+# define AF_ALG 38
+#endif
+
+#ifndef EM_BPF
+# define EM_BPF 247
+#endif
+
+struct bpf_cfg_ops {
+ void (*cbpf_cb)(void *nl, const struct sock_filter *ops, int ops_len);
+ void (*ebpf_cb)(void *nl, int fd, const char *annotation);
+};
+
+struct bpf_cfg_in {
+ const char *object;
+ const char *section;
+ const char *uds;
+ int argc;
+ char **argv;
+ struct sock_filter *ops;
+};
+
+/* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */
+
+#define BPF_ALU64_REG(OP, DST, SRC) \
+ ((struct bpf_insn) { \
+ .code = BPF_ALU64 | BPF_OP(OP) | BPF_X, \
+ .dst_reg = DST, \
+ .src_reg = SRC, \
+ .off = 0, \
+ .imm = 0 })
+
+#define BPF_ALU32_REG(OP, DST, SRC) \
+ ((struct bpf_insn) { \
+ .code = BPF_ALU | BPF_OP(OP) | BPF_X, \
+ .dst_reg = DST, \
+ .src_reg = SRC, \
+ .off = 0, \
+ .imm = 0 })
+
+/* ALU ops on immediates, bpf_add|sub|...: dst_reg += imm32 */
+
+#define BPF_ALU64_IMM(OP, DST, IMM) \
+ ((struct bpf_insn) { \
+ .code = BPF_ALU64 | BPF_OP(OP) | BPF_K, \
+ .dst_reg = DST, \
+ .src_reg = 0, \
+ .off = 0, \
+ .imm = IMM })
+
+#define BPF_ALU32_IMM(OP, DST, IMM) \
+ ((struct bpf_insn) { \
+ .code = BPF_ALU | BPF_OP(OP) | BPF_K, \
+ .dst_reg = DST, \
+ .src_reg = 0, \
+ .off = 0, \
+ .imm = IMM })
+
+/* Short form of mov, dst_reg = src_reg */
+
+#define BPF_MOV64_REG(DST, SRC) \
+ ((struct bpf_insn) { \
+ .code = BPF_ALU64 | BPF_MOV | BPF_X, \
+ .dst_reg = DST, \
+ .src_reg = SRC, \
+ .off = 0, \
+ .imm = 0 })
+
+#define BPF_MOV32_REG(DST, SRC) \
+ ((struct bpf_insn) { \
+ .code = BPF_ALU | BPF_MOV | BPF_X, \
+ .dst_reg = DST, \
+ .src_reg = SRC, \
+ .off = 0, \
+ .imm = 0 })
+
+/* Short form of mov, dst_reg = imm32 */
+
+#define BPF_MOV64_IMM(DST, IMM) \
+ ((struct bpf_insn) { \
+ .code = BPF_ALU64 | BPF_MOV | BPF_K, \
+ .dst_reg = DST, \
+ .src_reg = 0, \
+ .off = 0, \
+ .imm = IMM })
+
+#define BPF_MOV32_IMM(DST, IMM) \
+ ((struct bpf_insn) { \
+ .code = BPF_ALU | BPF_MOV | BPF_K, \
+ .dst_reg = DST, \
+ .src_reg = 0, \
+ .off = 0, \
+ .imm = IMM })
+
+/* BPF_LD_IMM64 macro encodes single 'load 64-bit immediate' insn */
+#define BPF_LD_IMM64(DST, IMM) \
+ BPF_LD_IMM64_RAW(DST, 0, IMM)
+
+#define BPF_LD_IMM64_RAW(DST, SRC, IMM) \
+ ((struct bpf_insn) { \
+ .code = BPF_LD | BPF_DW | BPF_IMM, \
+ .dst_reg = DST, \
+ .src_reg = SRC, \
+ .off = 0, \
+ .imm = (__u32) (IMM) }), \
+ ((struct bpf_insn) { \
+ .code = 0, /* zero is reserved opcode */ \
+ .dst_reg = 0, \
+ .src_reg = 0, \
+ .off = 0, \
+ .imm = ((__u64) (IMM)) >> 32 })
+
+#ifndef BPF_PSEUDO_MAP_FD
+# define BPF_PSEUDO_MAP_FD 1
+#endif
+
+/* pseudo BPF_LD_IMM64 insn used to refer to process-local map_fd */
+#define BPF_LD_MAP_FD(DST, MAP_FD) \
+ BPF_LD_IMM64_RAW(DST, BPF_PSEUDO_MAP_FD, MAP_FD)
+
+
+/* Direct packet access, R0 = *(uint *) (skb->data + imm32) */
+
+#define BPF_LD_ABS(SIZE, IMM) \
+ ((struct bpf_insn) { \
+ .code = BPF_LD | BPF_SIZE(SIZE) | BPF_ABS, \
+ .dst_reg = 0, \
+ .src_reg = 0, \
+ .off = 0, \
+ .imm = IMM })
+
+/* Memory load, dst_reg = *(uint *) (src_reg + off16) */
+
+#define BPF_LDX_MEM(SIZE, DST, SRC, OFF) \
+ ((struct bpf_insn) { \
+ .code = BPF_LDX | BPF_SIZE(SIZE) | BPF_MEM, \
+ .dst_reg = DST, \
+ .src_reg = SRC, \
+ .off = OFF, \
+ .imm = 0 })
+
+/* Memory store, *(uint *) (dst_reg + off16) = src_reg */
+
+#define BPF_STX_MEM(SIZE, DST, SRC, OFF) \
+ ((struct bpf_insn) { \
+ .code = BPF_STX | BPF_SIZE(SIZE) | BPF_MEM, \
+ .dst_reg = DST, \
+ .src_reg = SRC, \
+ .off = OFF, \
+ .imm = 0 })
+
+/* Memory store, *(uint *) (dst_reg + off16) = imm32 */
+
+#define BPF_ST_MEM(SIZE, DST, OFF, IMM) \
+ ((struct bpf_insn) { \
+ .code = BPF_ST | BPF_SIZE(SIZE) | BPF_MEM, \
+ .dst_reg = DST, \
+ .src_reg = 0, \
+ .off = OFF, \
+ .imm = IMM })
+
+/* Conditional jumps against registers, if (dst_reg 'op' src_reg) goto pc + off16 */
+
+#define BPF_JMP_REG(OP, DST, SRC, OFF) \
+ ((struct bpf_insn) { \
+ .code = BPF_JMP | BPF_OP(OP) | BPF_X, \
+ .dst_reg = DST, \
+ .src_reg = SRC, \
+ .off = OFF, \
+ .imm = 0 })
+
+/* Conditional jumps against immediates, if (dst_reg 'op' imm32) goto pc + off16 */
+
+#define BPF_JMP_IMM(OP, DST, IMM, OFF) \
+ ((struct bpf_insn) { \
+ .code = BPF_JMP | BPF_OP(OP) | BPF_K, \
+ .dst_reg = DST, \
+ .src_reg = 0, \
+ .off = OFF, \
+ .imm = IMM })
+
+/* Raw code statement block */
+
+#define BPF_RAW_INSN(CODE, DST, SRC, OFF, IMM) \
+ ((struct bpf_insn) { \
+ .code = CODE, \
+ .dst_reg = DST, \
+ .src_reg = SRC, \
+ .off = OFF, \
+ .imm = IMM })
+
+/* Program exit */
+
+#define BPF_EXIT_INSN() \
+ ((struct bpf_insn) { \
+ .code = BPF_JMP | BPF_EXIT, \
+ .dst_reg = 0, \
+ .src_reg = 0, \
+ .off = 0, \
+ .imm = 0 })
+
+int bpf_parse_common(enum bpf_prog_type type, struct bpf_cfg_in *cfg,
+ const struct bpf_cfg_ops *ops, void *nl);
+
+const char *bpf_prog_to_default_section(enum bpf_prog_type type);
+
+int bpf_graft_map(const char *map_path, uint32_t *key, int argc, char **argv);
+int bpf_trace_pipe(void);
+
+void bpf_print_ops(FILE *f, struct rtattr *bpf_ops, __u16 len);
+
+int bpf_prog_load(enum bpf_prog_type type, const struct bpf_insn *insns,
+ size_t size_insns, const char *license, char *log,
+ size_t size_log);
+
+int bpf_prog_attach_fd(int prog_fd, int target_fd, enum bpf_attach_type type);
+int bpf_prog_detach_fd(int target_fd, enum bpf_attach_type type);
+
+int bpf_dump_prog_info(FILE *f, uint32_t id);
+
+#ifdef HAVE_ELF
+int bpf_send_map_fds(const char *path, const char *obj);
+int bpf_recv_map_fds(const char *path, int *fds, struct bpf_map_aux *aux,
+ unsigned int entries);
+#else
+static inline int bpf_send_map_fds(const char *path, const char *obj)
+{
+ return 0;
+}
+
+static inline int bpf_recv_map_fds(const char *path, int *fds,
+ struct bpf_map_aux *aux,
+ unsigned int entries)
+{
+ return -1;
+}
+#endif /* HAVE_ELF */
+#endif /* __BPF_UTIL__ */
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-01 09:49:34 +0000