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11c39b5e98
mirror_iproute2/include/utils.h
Daniel Borkmann 11c39b5e98 tc: add eBPF support to f_bpf 
This work adds the tc frontend for kernel commit e2e9b6541dd4 ("cls_bpf:
add initial eBPF support for programmable classifiers").

A C-like classifier program (f.e. see e2e9b6541dd4) is being compiled via
LLVM's eBPF backend into an ELF file, that is then being passed to tc. tc
then loads, if any, eBPF maps and eBPF opcodes (with fixed-up eBPF map file
descriptors) out of its dedicated sections, and via bpf(2) into the kernel
and then the resulting fd via netlink down to cls_bpf. cls_bpf allows for
annotations, currently, I've used the file name for that, so that the user
can easily identify his filter when dumping configurations back.

Example usage:

  clang -O2 -emit-llvm -c cls.c -o - | llc -march=bpf -filetype=obj -o cls.o
  tc filter add dev em1 parent 1: bpf run object-file cls.o classid x:y

  tc filter show dev em1 [...]
  filter parent 1: protocol all pref 49152 bpf handle 0x1 flowid x:y cls.o

I placed the parser bits derived from Alexei's kernel sample, into tc_bpf.c
as my next step is to also add the same support for BPF action, so we can
have a fully fledged eBPF classifier and action in tc.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
2015-03-24 15:45:23 -07:00

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#ifndef __UTILS_H__
#define __UTILS_H__ 1
#include <sys/types.h>
#include <asm/types.h>
#include <resolv.h>
#include <stdlib.h>
#include <stdbool.h>
#include "libnetlink.h"
#include "ll_map.h"
#include "rtm_map.h"
extern int preferred_family;
extern int human_readable;
extern int use_iec;
extern int show_stats;
extern int show_details;
extern int show_raw;
extern int resolve_hosts;
extern int oneline;
extern int timestamp;
extern int timestamp_short;
extern char * _SL_;
extern int max_flush_loops;
extern int batch_mode;
extern bool do_all;
#ifndef IPPROTO_ESP
#define IPPROTO_ESP 50
#endif
#ifndef IPPROTO_AH
#define IPPROTO_AH 51
#endif
#ifndef IPPROTO_COMP
#define IPPROTO_COMP 108
#endif
#ifndef IPSEC_PROTO_ANY
#define IPSEC_PROTO_ANY 255
#endif
#define SPRINT_BSIZE 64
#define SPRINT_BUF(x) char x[SPRINT_BSIZE]
extern void incomplete_command(void) __attribute__((noreturn));
#define NEXT_ARG() do { argv++; if (--argc <= 0) incomplete_command(); } while(0)
#define NEXT_ARG_OK() (argc - 1 > 0)
#define PREV_ARG() do { argv--; argc++; } while(0)
typedef struct
{
__u8 family;
__u8 bytelen;
__s16 bitlen;
__u32 flags;
__u32 data[8];
} inet_prefix;
#define PREFIXLEN_SPECIFIED 1
#define DN_MAXADDL 20
#ifndef AF_DECnet
#define AF_DECnet 12
#endif
struct dn_naddr
{
unsigned short a_len;
unsigned char a_addr[DN_MAXADDL];
};
#define IPX_NODE_LEN 6
struct ipx_addr {
u_int32_t ipx_net;
u_int8_t ipx_node[IPX_NODE_LEN];
};
extern __u32 get_addr32(const char *name);
extern int get_addr_1(inet_prefix *dst, const char *arg, int family);
extern int get_prefix_1(inet_prefix *dst, char *arg, int family);
extern int get_addr(inet_prefix *dst, const char *arg, int family);
extern int get_prefix(inet_prefix *dst, char *arg, int family);
extern int mask2bits(__u32 netmask);
extern int get_integer(int *val, const char *arg, int base);
extern int get_unsigned(unsigned *val, const char *arg, int base);
extern int get_time_rtt(unsigned *val, const char *arg, int *raw);
#define get_byte get_u8
#define get_ushort get_u16
#define get_short get_s16
extern int get_u64(__u64 *val, const char *arg, int base);
extern int get_u32(__u32 *val, const char *arg, int base);
extern int get_s32(__s32 *val, const char *arg, int base);
extern int get_u16(__u16 *val, const char *arg, int base);
extern int get_s16(__s16 *val, const char *arg, int base);
extern int get_u8(__u8 *val, const char *arg, int base);
extern int get_s8(__s8 *val, const char *arg, int base);
extern char* hexstring_n2a(const __u8 *str, int len, char *buf, int blen);
extern __u8* hexstring_a2n(const char *str, __u8 *buf, int blen);
extern int af_bit_len(int af);
extern int af_byte_len(int af);
extern const char *format_host(int af, int len, const void *addr,
char *buf, int buflen);
extern const char *rt_addr_n2a(int af, const void *addr,
char *buf, int buflen);
void missarg(const char *) __attribute__((noreturn));
void invarg(const char *, const char *) __attribute__((noreturn));
void duparg(const char *, const char *) __attribute__((noreturn));
void duparg2(const char *, const char *) __attribute__((noreturn));
int matches(const char *arg, const char *pattern);
extern int inet_addr_match(const inet_prefix *a, const inet_prefix *b, int bits);
const char *dnet_ntop(int af, const void *addr, char *str, size_t len);
int dnet_pton(int af, const char *src, void *addr);
const char *ipx_ntop(int af, const void *addr, char *str, size_t len);
int ipx_pton(int af, const char *src, void *addr);
extern int __iproute2_hz_internal;
extern int __get_hz(void);
static __inline__ int get_hz(void)
{
if (__iproute2_hz_internal == 0)
__iproute2_hz_internal = __get_hz();
return __iproute2_hz_internal;
}
extern int __iproute2_user_hz_internal;
extern int __get_user_hz(void);
static __inline__ int get_user_hz(void)
{
if (__iproute2_user_hz_internal == 0)
__iproute2_user_hz_internal = __get_user_hz();
return __iproute2_user_hz_internal;
}
static inline __u32 nl_mgrp(__u32 group)
{
if (group > 31 ) {
fprintf(stderr, "Use setsockopt for this group %d\n", group);
exit(-1);
}
return group ? (1 << (group - 1)) : 0;
}
int print_timestamp(FILE *fp);
void print_nlmsg_timestamp(FILE *fp, const struct nlmsghdr *n);
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
#ifndef __check_format_string
# define __check_format_string(pos_str, pos_args) \
__attribute__ ((format (printf, (pos_str), (pos_args))))
#endif
extern int cmdlineno;
extern ssize_t getcmdline(char **line, size_t *len, FILE *in);
extern int makeargs(char *line, char *argv[], int maxargs);
extern int inet_get_addr(const char *src, __u32 *dst, struct in6_addr *dst6);
struct iplink_req;
int iplink_parse(int argc, char **argv, struct iplink_req *req,
char **name, char **type, char **link, char **dev,
int *group, int *index);
extern int do_each_netns(int (*func)(char *nsname, void *arg), void *arg,
bool show_label);
char *int_to_str(int val, char *buf);
#endif /* __UTILS_H__ */
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