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inet_diag: Move the INET_DIAG_REQ_BYTECODE nlattr to cb->data

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The INET_DIAG_REQ_BYTECODE nlattr is currently re-found every time when
the "dump()" is re-started.

In a latter patch, it will also need to parse the new
INET_DIAG_REQ_SK_BPF_STORAGES nlattr to learn the map_fds. Thus, this
patch takes this chance to store the parsed nlattr in cb->data
during the "start" time of a dump.

By doing this, the "bc" argument also becomes unnecessary
and is removed.  Also, the two copies of the INET_DIAG_REQ_BYTECODE
parsing-audit logic between compat/current version can be
consolidated to one.

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20200225230415.1975555-1-kafai@fb.com
This commit is contained in:
Martin KaFai Lau
2020-02-25 15:04:15 -08:00
committed by Alexei Starovoitov
parent 5682d393b4
commit 0df6d32842
8 changed files with 98 additions and 64 deletions
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3
include/uapi/linux/inet_diag.h
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@@ -64,9 +64,10 @@ struct inet_diag_req_raw {
enum {
INET_DIAG_REQ_NONE,
INET_DIAG_REQ_BYTECODE,
__INET_DIAG_REQ_MAX,
};
#define INET_DIAG_REQ_MAX INET_DIAG_REQ_BYTECODE
#define INET_DIAG_REQ_MAX (__INET_DIAG_REQ_MAX - 1)
/* Bytecode is sequence of 4 byte commands followed by variable arguments.
* All the commands identified by "code" are conditional jumps forward: