85 lines
2.1 KiB
C
85 lines
2.1 KiB
C
/*
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* tc_bpf.h BPF common code
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*
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* This program is free software; you can distribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Daniel Borkmann <dborkman@redhat.com>
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* Jiri Pirko <jiri@resnulli.us>
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*/
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#ifndef _TC_BPF_H_
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#define _TC_BPF_H_ 1
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#include <linux/filter.h>
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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#include <linux/bpf.h>
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#include <sys/syscall.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdint.h>
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#include "utils.h"
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/* Note:
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*
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* Below ELF section names and bpf_elf_map structure definition
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* are not (!) kernel ABI. It's rather a "contract" between the
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* application and the BPF loader in tc. For compatibility, the
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* section names should stay as-is. Introduction of aliases, if
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* needed, are a possibility, though.
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*/
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/* ELF section names, etc */
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#define ELF_SECTION_LICENSE "license"
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#define ELF_SECTION_MAPS "maps"
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#define ELF_SECTION_CLASSIFIER "classifier"
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#define ELF_SECTION_ACTION "action"
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#define ELF_MAX_MAPS 64
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#define ELF_MAX_LICENSE_LEN 128
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/* ELF map definition */
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struct bpf_elf_map {
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__u32 type;
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__u32 size_key;
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__u32 size_value;
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__u32 max_elem;
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};
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int bpf_parse_string(char *arg, bool from_file, __u16 *bpf_len,
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char **bpf_string, bool *need_release,
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const char separator);
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int bpf_parse_ops(int argc, char **argv, struct sock_filter *bpf_ops,
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bool from_file);
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void bpf_print_ops(FILE *f, struct rtattr *bpf_ops, __u16 len);
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static inline __u64 bpf_ptr_to_u64(const void *ptr)
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{
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return (__u64) (unsigned long) ptr;
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}
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#ifdef HAVE_ELF
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int bpf_open_object(const char *path, enum bpf_prog_type type);
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static inline int bpf(int cmd, union bpf_attr *attr, unsigned int size)
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{
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#ifdef __NR_bpf
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return syscall(__NR_bpf, cmd, attr, size);
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#else
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errno = ENOSYS;
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return -1;
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#endif
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}
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#else
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static inline int bpf_open_object(const char *path, enum bpf_prog_type type)
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{
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errno = ENOSYS;
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return -1;
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}
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#endif /* HAVE_ELF */
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#endif /* _TC_BPF_H_ */
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