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* xlat/bpf_prog_types.in (BPF_PROG_TYPE_SK_REUSEPORT): New constant,
introduced by Linux commit v4.19-rc1~140^2~24^2~2^2~5.
* tests/bpf.c: Update expected output.
* xlat/bpf_map_types.in (BPF_MAP_TYPE_CGROUP_STORAGE): New constant,
introduced by Linux commit v4.19-rc1~140^2~108^2~3^2~12.
(BPF_MAP_TYPE_REUSEPORT_SOCKARRAY): New constant, introduced by Linux
commit v4.19-rc1~140^2~24^2~2^2~6.
* tests/bpf.c: Update expected output.
* xlat/bpf_attach_type.in (BPF_CGROUP_UDP4_SENDMSG,
BPF_CGROUP_UDP6_SENDMSG): New constant, introduced by Linux commit
v4.18-rc1~114^2~9^2~20^2~4.
(BPF_LIRC_MODE2): New constant, introduced by Linux commit
v4.18-rc1~114^2~9^2~15^2~1.
* xlat/bpf_commands.in (BPF_BTF_LOAD): New constant, introduced by Linux
commit v4.18-rc1~114^2~417^2~1^2~5.
(BPF_BTF_GET_FD_BY_ID): New constant, introduced by Linux commit
v4.18-rc1~114^2~223^2~21^2~4.
(BPF_TASK_FD_QUERY): New constant, introduced by Linux commit
v4.18-rc1~114^2~148^2~1^2~5.
* xlat/bpf_map_types.in (BPF_MAP_TYPE_XSKMAP): New constant, introduced
by Linux commit v4.18-rc1~114^2~304^2~4^2~8.
(BPF_MAP_TYPE_SOCKHASH): New constant, introduced by Linux commit
v4.18-rc1~114^2~223^2~5^2~2.
* xlat/bpf_prog_types.in (BPF_PROG_TYPE_LWT_SEG6LOCAL): New constant,
introduced by Linux commit v4.18-rc1~114^2~148^2~2^2~1.
(BPF_PROG_TYPE_LIRC_MODE2): New constant, introduced by Linux commit
v4.18-rc1~114^2~9^2~15^2~1.
* tests/bpf.c: Update expected output.
* bpf.c (BEGIN_BPF_CMD_DECODER(BPF_PROG_LOAD)): Print log_buf field
as a string.
* tests/bpf.c: Update expected output.
Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>
* bpf_attr.h [!BPF_TAG_SIZE] (BPF_TAG_SIZE): Define.
[BPF_TAG_SIZE]: Check that BPF_TAG_SIZE is 8.
(struct bpf_map_info_struct, struct bpf_prog_info_struct): New
structures.
(bpf_map_info_struct_size, expected_bpf_map_info_struct_size,
bpf_prog_info_struct_size, expected_bpf_prog_info_struct_size): New
macro constants.
* bpf.c (print_bpf_obj_info_fn): New type.
(print_bpf_map_info, print_bpf_prog_info, fetch_bpf_obj_info,
print_bpf_obj_info_addr, print_bpf_obj_info): New functions.
(BEGIN_BPF_CMD_DECODER(BPF_OBJ_GET_INFO_BY_FD)): Print bpf_fd and info_len
fields only on entering, call print_bpf_obj_info for printing info field.
* tests/bpf.c (BPF_OBJ_GET_INFO_BY_FD_checks): Print info field
as a pointer.
Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>
* tests/bpf-success-v.c: New file.
* tests/bpf-success.c: Likewise.
* tests/bpf-success-v.test: New test.
* tests/bpf-success.test: Likewise.
* tests/.gitignore: Add bpf-success and bpf-success-v.
* tests/Makefile.am (check_PROGRAMS): Likewise.
(DECODER_TESTS): Add bpf-success.test and bpf-success-v.test.
* tests/bpf.c [INJECT_RETVAL] (sys_bpf): Check that retuned value
is equivalent to the injected one; append "(INJECTED)" string to errstr.
(prog_load_ids, prog_load_ids_ptr): New variables.
(init_BPF_PROG_QUERY_attr4, print_BPF_PROG_QUERY_attr4,
init_BPF_PROG_QUERY_attr5, print_BPF_PROG_QUERY_attr5): New functions.
(BPF_PROG_QUERY_checks): Drop "const" qualifier, add new checks.
* bpf.c (BEGIN_BPF_CMD_DECODER(BPF_PROG_QUERY)): Use
print_uint32_array_member instead of print_uint64_array_member for
printing prog_ids elements (and change the type of prog_id_buf from
uint64_t to uint32_t), as they are 32-bit; use common trick with
print_big_u64_addr for handling possible ambiguity with prog_ids
address.
* tests/bpf.c (BIG_ADDR_MAYBE): New macro.
(BPF_PROG_QUERY_checks): Update expected output.
* xlat/ebpf_regs.in: New file.
* bpf.c (struct ebpf_insn, struct ebpf_insns_data): New type definitions.
(print_ebpf_insn, print_ebpf_prog): New functions.
(DEF_BPF_CMD_DECODER(BPF_PROG_LOAD)): Use them.
Replace BIG_ADDR_IS_64BIT and BIG_ADDR_IS_32BIT with BIG_ADDR().
* tests/bpf.c (BIG_ADDR): New macro.
(BIG_ADDR_IS_64BIT, BIG_ADDR_IS_32BIT): Remove.
(BPF_PROG_LOAD_checks, BPF_OBJ_PIN_checks,
BPF_RAW_TRACEPOINT_OPEN_checks): Use BIG_ADDR() instead of
BIG_ADDR_IS_64BIT and BIG_ADDR_IS_32BIT.
Introduce BIG_ADDR_IS_64BIT and BIG_ADDR_IS_32BIT to reduce redundancy.
* tests/bpf.c (BIG_ADDR_IS_64BIT, BIG_ADDR_IS_32BIT): New macros.
(BPF_PROG_LOAD_checks, BPF_OBJ_PIN_checks,
BPF_RAW_TRACEPOINT_OPEN_checks): Use them.
* xlat/bpf_attach_type.in (BPF_SK_MSG_VERDICT): New constant,
introduced by Linux commit v4.17-rc1~148^2~156^2~1^2~13.
(BPF_CGROUP_INET4_BIND, BPF_CGROUP_INET6_BIND): New constants,
introduced by Linux commit v4.17-rc1~148^2~19^2^2~6.
(BPF_CGROUP_INET4_CONNECT, BPF_CGROUP_INET6_CONNECT): New constants,
introduced by Linux commit v4.17-rc1~148^2~19^2^2~3.
(BPF_CGROUP_INET4_POST_BIND, BPF_CGROUP_INET6_POST_BIND): New constants,
introduced by Linux commit v4.17-rc1~148^2~19^2^2~1.
* tests/bpf.c (BPF_PROG_QUERY_checks): Update expected output.
Apparently, BPF_F_RDONLY and BPF_F_WRONLY are also used in map_flags.
Moreover, set of flags depends on the type of map, but let's leave that
for another day.
* xlat/bpf_map_flags.in (BPF_F_RDONLY, BPF_F_WRONLY): New constants.
(BPF_F_STACK_BUILD_ID): New constant, introduced by Linux commit
v4.17-rc1~148^2~156^2~3^2~1.
* xlat/bpf_map_flags.in: Update expected output.
* bpf.c (BEGIN_BPF_CMD_DECODER(BPF_MAP_LOOKUP_ELEM),
BEGIN_BPF_CMD_DECODER(BPF_MAP_UPDATE_ELEM)): Print key and value
fields using PRINT_FIELD_ADDR64.
(BEGIN_BPF_CMD_DECODER(BPF_MAP_DELETE_ELEM)): Print key field using
PRINT_FIELD_ADDR64.
(BEGIN_BPF_CMD_DECODER(BPF_MAP_GET_NEXT_KEY)): Print key and next_key
field using PRINT_FIELD_ADDR64.
(BEGIN_BPF_CMD_DECODER(BPF_PROG_LOAD)): Print insns and log_buf fields
using PRINT_FIELD_ADDR64.
(BEGIN_BPF_CMD_DECODER(BPF_PROG_TEST_RUN)): Print data_in and data_out
fields using PRINT_FIELD_ADDR64.
* tests/bpf.c: Update expected output.
* bpf.c (BEGIN_BPF_CMD_DECODER(BPF_MAP_CREATE)): Decode map_name
and map_ifindex fields that were added in Linux commits
v4.15-rc1~84^2~605^2~3 and v4.16-rc1~123^2~145^2~5^2~8, respectively.
* bpf_attr.h (struct BPF_MAP_CREATE_struct): Add map_name
and map_ifindex fields.
* tests/bpf.c (init_BPF_MAP_CREATE_attr7): New function.
(BPF_MAP_CREATE_checks): Remove const qualifier, add two more checks.
* bpf.c (BEGIN_BPF_CMD_DECODER(BPF_MAP_CREATE)): Skip printing
the rest of the structure if len is less than the offset of the end
of max_entries, map_flags, or inner_map_fd field.
* tests/bpf.c (BPF_MAP_CREATE_checks): Add two more checks.
BPF_PROG_QUERY was introduced in Linux commit v4.15-rc1~84^2~558^2~6.
* xlat/bpf_commands.in (BPF_PROG_QUERY): New constant.
* xlat/bpf_query_flags.in: New file.
* bpf.c: Include it.
(DECL_BPF_CMD_DECODER): Add priv argument for passing tcb private data.
(BEGIN_BPF_CMD_DECODER(BPF_PROG_QUERY)): New function.
(SYS_FUNC(bpf)) <bpf_cmd_decoders>: Add BPF_PROG_QUERY entry.
(SYS_FUNC(bpf)): Fetch buf on entering and exiting, pass buf on exiting,
retrieve private data on exiting, pass it to decoder as well, explicitly
rework rc handling logic for size argument printing.
* bpf_attr.h (struct BPF_PROG_QUERY_struct): New structure declaration.
(BPF_PROG_QUERY_struct_size, expected_BPF_PROG_QUERY_struct_size): New
macro.
* tests/bpf.c: Add checks for BPF_PROG_QUERY command.
* bpf.c (BEGIN_BPF_CMD_DECODER(BPF_PROG_LOAD)): Add support for decoding
of prog_name (introduced in Linux commit v4.15-rc1~84^2~605^2~4) and
prog_ifindex (introduced as prog_target_ifindex in v4.15-rc1~84^2~127^2~13,
renamed in v4.15-rc1~15^2~5^2~3^2~7).
* bpf_attr.h [!BPF_OBJ_NAME_LEN] (BPF_OBJ_NAME_LEN): New macro constant.
[BPF_OBJ_NAME_LEN]: Check that BPF_OBJ_NAME_LEN is equal to 16.
(struct BPF_PROG_LOAD_struct): Add prog_name and prog_ifindex fields.
(BPF_PROG_LOAD_struct_size, expected_BPF_PROG_LOAD_struct_size): Update.
* tests/bpf.c (init_BPF_PROG_LOAD_attr): Rename
to init_BPF_PROG_LOAD_attr3.
(print_BPF_PROG_LOAD_attr): Rename to print_BPF_PROG_LOAD_attr3.
(init_BPF_PROG_LOAD_attr4, print_BPF_PROG_LOAD_attr4): New functions.
(BPF_PROG_LOAD_checks): Check new decoding features.
Since pointers stored in the bpf_attr union are 64-bit regardless
of architecture bitness.
* bpf.c (DEF_BPF_CMD_DECODER(BPF_PROG_LOAD)): Call print_big_u64_addr
for attr.license.
(DEF_BPF_CMD_DECODER(BPF_OBJ_PIN)): Call print_big_u64_addr
for attr.pathname.
* tests/bpf.c (BPF_OBJ_PIN_checks): Check it.
Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>
These were introduced by Linux commit v4.15-rc1~84^2~384^2~4.
* bpf_attr.h (struct BPF_OBJ_PIN_struct): Add file_flags field.
(struct BPF_PROG_GET_NEXT_ID_struct, struct BPF_PROG_GET_FD_BY_ID_struct,
struct BPF_MAP_GET_FD_BY_ID_struct): Add open_flags field.
(BPF_OBJ_PIN_struct_size, expected_BPF_OBJ_PIN_struct_size,
expected_BPF_PROG_GET_NEXT_ID_struct_size,
expected_BPF_PROG_GET_FD_BY_ID_struct_size,
expected_BPF_MAP_GET_FD_BY_ID_struct_size): Update.
* bpf.c (DEF_BPF_CMD_DECODER(BPF_OBJ_PIN)): Check the length, skip
printing the rest of attributes if it is less than offset of the
end of the bpf_fd field, print file_flags field otherwise.
(DEF_BPF_CMD_DECODER(BPF_PROG_GET_NEXT_ID),
DEF_BPF_CMD_DECODER(BPF_PROG_GET_FD_BY_ID),
DEF_BPF_CMD_DECODER(BPF_MAP_GET_FD_BY_ID)): Check the length, skip
printing the rest of attributes if it is less than offset of the
end of the next_id field, print open_flags field otherwise.
* xlat/bpf_file_mode_flags.in: New file.
* tests/bpf.c (BPF_OBJ_PIN_checks, BPF_PROG_GET_NEXT_ID_checks,
BPF_PROG_GET_FD_BY_ID_checks, BPF_MAP_GET_FD_BY_ID_checks): Check it.
Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>
The aim of this change is to introduce an ability to perform multiple
checks for a specific bpf command. In order to achieve so, all the
related data is stored in check descriptor, and test_bpf iterates over
it. There are also some provisions made in regard to future changes
(specifically, the way bpf_attr_data union is defined).
* tests/bpf.c (print_bpf_attr): New function, a wrapper around
struct bpf_check.printer.
(test_bpf_): Rename to...
(test_bpf): ...this. Replace arguments with struct bpf_check pointer.
Iterate over possible attribute variants. Account for changes in
attribute initialisation routine: provide a pointer to locally defined
union bpf_attr_data and perform memcpy afterwards. Initialise memory
from data each time before a bpf call.
(TEST_BPF, DEF_*, init_*, print_*): Remove.
(init_BPF_PROG_LOAD_attr, print_BPF_PROG_LOAD_attr,
init_BPF_OBJ_PIN_attr): New functions.
(license, pathname): New variables.
(BPF_MAP_CREATE_checks, BPF_MAP_LOOKUP_ELEM_checks,
BPF_MAP_UPDATE_ELEM_checks, BPF_MAP_DELETE_ELEM_checks,
BPF_MAP_GET_NEXT_KEY_checks, BPF_PROG_LOAD_checks, BPF_OBJ_PIN_checks,
BPF_PROG_ATTACH_checks, BPF_PROG_DETACH_checks,
BPF_PROG_TEST_RUN_checks, BPF_PROG_GET_NEXT_ID_checks,
BPF_PROG_GET_FD_BY_ID_checks, BPF_MAP_GET_FD_BY_ID_checks,
BPF_OBJ_GET_INFO_BY_FD_checks): New arrays.
(BPF_OBJ_GET_checks, BPF_MAP_GET_NEXT_ID_checks): New macros.
(CHK): New macro, a shorthand for initialising array of struct bpf_check.
(main): New static constant checks, iterate over checks and run test_bpf
with each element.
Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>
* configure.ac (AC_CHECK_HEADERS([linux/bpf.h])): Check for
struct bpf_insn.
* tests/bpf.c: Remove the test guard, include "scno.h", "bpf_attr.h",
"xlat.h", and "xlat/bpf_commands.h". Conditionalize inclusion of
<linux/bpf.h> on HAVE_LINUX_BPF_H. Remove all HAVE_UNION_* checks.
(BPF_ATTR_DATA_FIELD): New macro.
(bpf_attr_data): New union. Note that it is larger than modern
union bpf_attr, this allows more checks to be implemented in the future.
(sizeof_attr, test_bpf_): Replace union bpf_attr with
union bpf_attr_data.
(DEF_BPF_INIT_FIRST): Replace union bpf_attr with the corresponding
structure.
(init_BPF_MAP_CREATE_attr): Replace union bpf_attr with
struct BPF_MAP_CREATE_struct.
(init_BPF_MAP_LOOKUP_ELEM_attr): Replace union bpf_attr with
struct BPF_MAP_LOOKUP_ELEM_struct.
(init_BPF_MAP_UPDATE_ELEM_attr): Replace union bpf_attr with
struct BPF_MAP_UPDATE_ELEM_struct.
(init_BPF_MAP_DELETE_ELEM_attr): Replace union bpf_attr with
struct BPF_MAP_DELETE_ELEM_struct.
(init_BPF_MAP_GET_NEXT_KEY_attr): Replace union bpf_attr with
struct BPF_MAP_GET_NEXT_KEY_struct.
(init_BPF_PROG_LOAD_attr): Replace union bpf_attr with
struct BPF_PROG_LOAD_struct.
(init_BPF_OBJ_PIN_attr): Replace union bpf_attr with
struct BPF_OBJ_PIN_struct.
(init_BPF_PROG_ATTACH_attr): Replace union bpf_attr with
struct BPF_PROG_ATTACH_struct.
(init_BPF_PROG_DETACH_attr): Replace union bpf_attr with
struct BPF_PROG_DETACH_struct.
(init_BPF_PROG_GET_NEXT_ID_attr): Replace union bpf_attr with
struct BPF_PROG_GET_NEXT_ID_struct.
(sample_BPF_PROG_TEST_RUN_attr): Change type from union bpf_attr to
struct BPF_PROG_TEST_RUN_struct, all users updated.
(sample_BPF_OBJ_GET_INFO_BY_FD_attr): Change type from union bpf_attr
to struct BPF_OBJ_GET_INFO_BY_FD_struct, all users updated.
As it could be not entirely clear what bytes are printed.
* bpf.c (decode_attr_extra_data): Print a comment about the byte range
to be printed.
* tests/bpf.c: Update expected output.
As it looks like there's no compelling reason to keep it as a macro and
leaving it so quite complicates modification of the routine and makes
them error-prone.
* tests/bpf.c (TEST_BPF_): Convert it to...
(test_bpf): ...this. Rename cmd_ to cmd, cmd_str_ to cmd_str,
init_first_ to init_first, print_first_ to print_first, init_attr_
to init_attr, print_attr_ to print_attr.
(TEST_BPF): Call test_bpf_ instead of TEST_BPF_.
As program attributes have been added gradually over kernel versions,
attribute size less than expected should be printed accordingly.
* bpf.c (DEF_BPF_CMD_DECODER(BPF_PROG_LOAD)): Do not print structure
fields if their size is less than the initially introduced (in Linux
commit v3.18-rc1~52^2~1^2~7) version. Print fields of union bpf_attr
introduced in various kernel versions when the length is big enough
(new fields were introduced in Linux commits v3.18-rc1~52^2~1^2~4,
v4.1-rc1~84^2~50, and v4.12-rc2~34^2~29^2~2).
* tests/bpf.c (print_BPF_PROG_LOAD_first): Update expected output.
Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>
* bpf.c (DEF_BPF_CMD_DECODER(BPF_PROG_LOAD)): Print
union bpf_attr.kern_version in the form of KERNEL_VERSION macro call.
* tests/bpf.c: Update expected output.
* tests/bpf.c (DEF_BPF_INIT_FIRST): New macro.
(init_BPF_MAP_CREATE_first, init_BPF_MAP_LOOKUP_ELEM_first,
init_BPF_PROG_LOAD_first, init_BPF_OBJ_PIN_first,
init_BPF_PROG_ATTACH_first, init_BPF_PROG_TEST_RUN_first,
init_BPF_PROG_GET_NEXT_ID_first, init_BPF_OBJ_GET_INFO_BY_FD_first):
Use it.
* configure.ac: Check for union bpf_attr.test.duration.
* bpf.c (decode_BPF_PROG_TEST_RUN): New function.
(SYS_FUNC(bpf)) <bpf_cmd_decoders>: Use it.
* NEWS: Mention this.
* tests/bpf.c: Include "print_fields.h".
Add macro guard for BPF_PROG_TEST_RUN decoder test.
[HAVE_UNION_BPF_ATTR_TEST_DURATION] (sample_BPF_PROG_TEST_RUN_attr):
New variable.
[HAVE_UNION_BPF_ATTR_TEST_DURATION] (init_BPF_PROG_TEST_RUN_first,
print_BPF_PROG_TEST_RUN_first, init_BPF_PROG_TEST_RUN_attr,
print_BPF_PROG_TEST_RUN_attr): New functions.
(main) [HAVE_UNION_BPF_ATTR_TEST_DURATION]: Use them.
Implement decoding of union bpf_attr.numa_node field for BPF_MAP_CREATE
command introduced by linux kernel commit v4.14-rc1~130^2~196^2~1.
* configure.ac: Check for numa_node member of union bpf_attr
instead of inner_map_fd.
(decode_BPF_MAP_CREATE): Add numa_node field to the structure, print it.
* NEWS: Mention this.
* tests/bpf.c: Update macro guards of BPF_MAP_CREATE decoder test.
(init_BPF_MAP_CREATE_first, print_BPF_MAP_CREATE_attr): Update expected
output.
(init_BPF_MAP_CREATE_attr): Initialize numa_node field, update offset.
Print union bpf_attr.value field of BPF_MAP_LOOKUP_ELEM command
and union bpf_attr.next_key field of BPF_MAP_GET_NEXT_KEY command
on entering syscall. These fields are addresses specified to the
kernel from userspace. The amount of data written by the kernel
to these addresses is specified at the map creation time
by BPF_MAP_CREATE command and is not available at this point.
* bpf.c (decode_BPF_MAP_LOOKUP_ELEM): Print union bpf_attr.value
on entering syscall.
(decode_BPF_MAP_GET_NEXT_KEY): Print union bpf_attr.next_key
on entering syscall.
(bpf_map_io): Remove.
* tests/bpf.c (print_BPF_MAP_DELETE_ELEM_first,
print_BPF_MAP_DELETE_ELEM_attr, print_BPF_MAP_GET_NEXT_KEY_first,
print_BPF_MAP_GET_NEXT_KEY_attr): Replace macro redirects with
new functions.
(print_BPF_MAP_LOOKUP_ELEM_first, print_BPF_MAP_LOOKUP_ELEM_attr,
Implement decoding of map_flags and inner_map_fd fields of union bpf_attr
for BPF_MAP_CREATE command introduced by linux kernel commits
v4.6-rc1~91^2~108^2~6 and v4.12-rc1~64^3~373^2~2, respectively.
* configure.ac: Check for inner_map_fd member of union bpf_attr
instead of max_entries.
* xlat/bpf_map_flags.in: New file.
* bpf.c: Include "xlat/bpf_map_flags.h".
(decode_BPF_MAP_CREATE): Add map_flags and inner_map_fd fields
to the structure, print them.
* tests/bpf.c: Update macro guards of BPF_MAP_CREATE decoder test.
(init_BPF_MAP_CREATE_first, print_BPF_MAP_CREATE_attr): Update expected
output.
(init_BPF_MAP_CREATE_attr): Initialize map_flags and inner_map_fd
fields, update offset.
Implement decoding of union bpf_attr.prog_flags field for BPF_PROG_LOAD
command introduced by linux kernel commit v4.12-rc2~34^2~29^2~2.
* configure.ac: Check for prog_flags member of union bpf_attr
instead of kern_version.
* xlat/bpf_prog_flags.in: New file.
* bpf.c: Include "xlat/bpf_prog_flags.h".
(decode_BPF_PROG_LOAD): Add prog_flags field to the structure, print it.
* tests/bpf.c: Update macro guards of BPF_PROG_LOAD decoder test.
(init_BPF_PROG_LOAD_first, print_BPF_PROG_LOAD_attr): Update expected
output.
(init_BPF_PROG_LOAD_attr): Initialize prog_flags field, update offset.
When the size argument specifies more data than necessary for the given
command, kernel checks that all unused fields of union bpf_attr are
zero. Print this extra data when it contains non-zero bytes to enhance
debugging experience.
* bpf.c (decode_attr_extra_data): New function.
(decode_BPF_MAP_CREATE, decode_BPF_MAP_UPDATE_ELEM,
decode_BPF_MAP_DELETE_ELEM, bpf_map_io, decode_BPF_PROG_LOAD,
decode_BPF_OBJ_PIN, decode_BPF_OBJ_GET, decode_BPF_PROG_ATTACH,
decode_BPF_PROG_DETACH): Use it to print extra data passed
via bpf_attr pointer.
(bpf_obj_manage, bpf_prog_attach_detach): Remove.
* tests/bpf.c (map_delete_elem): New function.
(main): Use it.
Implement decoding of BPF_F_ALLOW_OVERRIDE flag of BPF_PROG_ATTACH
command introduced by linux kernel commit v4.10-rc7-174-g7f67763.
* configure.ac: Check for union bpf_attr.attach_flags
instead of union bpf_attr.attach_type.
* xlat/bpf_attach_flags.in: New file.
* bpf.c: Include "xlat/bpf_attach_flags.h".
(bpf_prog_attach_detach): Rename print_attach_bpf_fd argument
to print_attach. Add attach_flags field to the structure,
print it in case of BPF_PROG_ATTACH.
* tests/bpf.c: Check for HAVE_UNION_BPF_ATTR_ATTACH_FLAGS
instead of HAVE_UNION_BPF_ATTR_ATTACH_TYPE.
(prog_cgroup): Initialize attach_flags field.
(main): Update expected output.
* tests/bpf.c (errstr): New variable.
(sys_bpf): New function.
(map_create, map_any, prog_load, obj_manage, prog_cgroup): Use it.
(main): Update expected output.
* tests/bpf.test: Use run_strace_match_diff.
Implement decoding of BPF_OBJ_PIN, BPF_OBJ_GET, BPF_PROG_ATTACH,
and BPF_PROG_DETACH commands.
* bpf.c: Include "xlat/bpf_attach_type.h".
(bpf_obj_manage, bpf_prog_attach, bpf_prog_detach): New functions.
(SYS_FUNC(bpf)): Use them.
* configure.ac: Check for union bpf_attr.bpf_fd and union
bpf_attr.attach_type.
* xlat/bpf_attach_type.in: New file.
* xlat/bpf_commands.in: Update list of BPF_* command constants.
* xlat/bpf_map_types.in: Update list of BPF_MAP_TYPE_* constants.
* xlat/bpf_prog_types.in: Update list of BPF_PROG_TYPE_* constants.
* tests/bpf.c [HAVE_UNION_BPF_ATTR_BPF_FD] (obj_manage): New function.
[HAVE_UNION_BPF_ATTR_ATTACH_TYPE] (prog_cgroup): Likewise.
(main): Use them.
