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netlink: add a basic netlink attribute parser of AF_NETLINK diag

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* linux/netlink_diag.h (NETLINK_DIAG_*): New enum.
* netlink_sock_diag.c: Include "xlat/netlink_diag_attrs.h".
(decode_netlink_diag_msg): Use decode_nlattr.
* xlat/netlink_diag_attrs.in: New file.

Co-authored-by: Fabien Siron <fabien.siron@epita.fr>
This commit is contained in:
JingPiao Chen 2017-06-27 18:10:03 +08:00 committed by Dmitry V. Levin
parent 4817a2925d
commit 4c511a1c99
3 changed files with 25 additions and 1 deletions
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8
linux/netlink_diag.h
View File

@ -23,6 +23,14 @@ struct netlink_diag_msg {
uint32_t ndiag_cookie[2];
};
enum {
NETLINK_DIAG_MEMINFO,
NETLINK_DIAG_GROUPS,
NETLINK_DIAG_RX_RING,
NETLINK_DIAG_TX_RING,
NETLINK_DIAG_FLAGS,
};
#define NDIAG_SHOW_MEMINFO 0x00000001
#define NDIAG_SHOW_GROUPS 0x00000002
#define NDIAG_SHOW_RING_CFG 0x00000004 /* deprecated since 4.6 */

12
netlink_sock_diag.c
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@ -45,6 +45,7 @@
#include "xlat/tcp_states.h"
#include "xlat/tcp_state_flags.h"
#include "xlat/netlink_diag_attrs.h"
#include "xlat/netlink_diag_show.h"
#include "xlat/netlink_states.h"
@ -200,7 +201,8 @@ decode_netlink_diag_msg(struct tcb *const tcp,
const kernel_ulong_t len)
{
struct netlink_diag_msg msg = { .ndiag_family = family };
const size_t offset = sizeof(msg.ndiag_family);
size_t offset = sizeof(msg.ndiag_family);
bool decode_nla = false;
PRINT_FIELD_XVAL("{", msg, ndiag_family, addrfams, "AF_???");
tprints(", ");
@ -219,10 +221,18 @@ decode_netlink_diag_msg(struct tcb *const tcp,
PRINT_FIELD_U(", ", msg, ndiag_dst_group);
PRINT_FIELD_U(", ", msg, ndiag_ino);
PRINT_FIELD_COOKIE(", ", msg, ndiag_cookie);
decode_nla = true;
}
} else
tprints("...");
tprints("}");
offset = NLA_ALIGN(sizeof(msg));
if (decode_nla && len > offset) {
tprints(", ");
decode_nlattr(tcp, addr + offset, len - offset,
netlink_diag_attrs, "NETLINK_DIAG_???");
}
}
static void

6
xlat/netlink_diag_attrs.in Normal file
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@ -0,0 +1,6 @@
#unconditional
NETLINK_DIAG_MEMINFO
NETLINK_DIAG_GROUPS
NETLINK_DIAG_RX_RING
NETLINK_DIAG_TX_RING
NETLINK_DIAG_FLAGS