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/*
* Copyright (c) 2016 Fabien Siron <fabien.siron@epita.fr>
* Copyright (c) 2017 JingPiao Chen <chenjingpiao@gmail.com>
* Copyright (c) 2016-2020 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#ifndef STRACE_NLATTR_H
# define STRACE_NLATTR_H
# include "xlat.h"
struct decode_nla_xlat_opts {
const struct xlat *xlat;
const char *dflt;
enum xlat_style style;
const char *prefix;
const char *suffix;
uint64_t (*process_fn)(uint64_t val);
size_t size;
};
/*
* Used for IFLA_LINKINFO decoding. Since there are no other indicators
* regarding the nature of data except for previously provided string
* in an IFLA_LINKINFO_KIND attribute, we have to store it in order to pass
* between calls as an opaque data.
*/
struct ifla_linkinfo_ctx {
char kind[16];
};
typedef bool (*nla_decoder_t)(struct tcb *, kernel_ulong_t addr,
unsigned int len, const void *opaque_data);
/**
* The case of non-NULL decoders and zero size is handled in a special way:
* the zeroth decoder is always called with nla_type being passed as opaque
* data.
*/
extern void
decode_nlattr(struct tcb *,
kernel_ulong_t addr,
unsigned int len,
const struct xlat *,
const char *dflt,
const nla_decoder_t *decoders,
unsigned int size,
const void *opaque_data);
# define DECL_NLA(name) \
extern bool \
decode_nla_ ## name(struct tcb *, kernel_ulong_t addr, \
unsigned int len, const void *) \
/* End of DECL_NLA definition. */
DECL_NLA(x8);
DECL_NLA(x16);
DECL_NLA(x32);
DECL_NLA(x64);
DECL_NLA(u8);
DECL_NLA(u16);
DECL_NLA(u32);
DECL_NLA(u64);
DECL_NLA(s8);
DECL_NLA(s16);
DECL_NLA(s32);
DECL_NLA(s64);
DECL_NLA(be16);
DECL_NLA(be64);
DECL_NLA(xval);
DECL_NLA(flags);
DECL_NLA(str);
DECL_NLA(strn);
DECL_NLA(fd);
DECL_NLA(uid);
DECL_NLA(gid);
DECL_NLA(ifindex);
DECL_NLA(ether_proto);
DECL_NLA(ip_proto);
DECL_NLA(in_addr);
DECL_NLA(in6_addr);
DECL_NLA(meminfo);
DECL_NLA(rt_class);
DECL_NLA(rt_proto);
DECL_NLA(tc_stats);
# define NLA_HWADDR_FAMILY_OFFSET 1024
/**
* Print hardware (low-level, L2) address.
* @param opaque_data Interpreted as integer value, not pointer
*/
DECL_NLA(hwaddr);
/** Non-standard decoder that accepts ARPHRD_* value as an argument */
static inline bool
decode_nla_hwaddr_family(struct tcb *const tcp,
const kernel_ulong_t addr,
const unsigned int len,
const unsigned int arphrd)
{
return decode_nla_hwaddr(tcp, addr, len, (void *) (uintptr_t) (
arphrd > NLA_HWADDR_FAMILY_OFFSET ? 0
: NLA_HWADDR_FAMILY_OFFSET | arphrd));
}
/** decode_nla_hwaddr wrapper that ignores opaque_data */
static inline bool
decode_nla_hwaddr_nofamily(struct tcb *const tcp,
const kernel_ulong_t addr,
const unsigned int len,
const void *const opaque_data)
{
return decode_nla_hwaddr(tcp, addr, len, NULL);
}
#endif /* !STRACE_NLATTR_H */
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