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rtnl_neigh: decode ndmsg netlink attributes

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* nlattr.c: Include <netinet/in.h> and <arpa/inet.h>.
(decode_nla_be16): New function.
* nlattr.h (decode_nla_be16): New prototype.
* rtnl_neigh.c (decode_neigh_addr,
decode_nda_cacheinfo): New functions.
(ndmsg_nla_decoders): New array.
(decode_ndmsg): Use it.
This commit is contained in:
JingPiao Chen 2017-08-28 00:46:22 +08:00
parent 65ad4f2cce
commit 19abd528fb
3 changed files with 70 additions and 1 deletions
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18
nlattr.c
View File

@ -31,6 +31,8 @@
#include <endian.h>
#include "netlink.h"
#include "nlattr.h"
#include <netinet/in.h>
#include <arpa/inet.h>
#include <linux/sock_diag.h>
static bool
@ -221,6 +223,22 @@ decode_nla_ifindex(struct tcb *const tcp,
return true;
}
bool
decode_nla_be16(struct tcb *const tcp,
const kernel_ulong_t addr,
const unsigned int len,
const void *const opaque_data)
{
uint16_t num;
if (len < sizeof(num))
return false;
else if (!umove_or_printaddr(tcp, addr, &num))
tprintf("htons(%u)", ntohs(num));
return true;
}
bool
decode_nla_be64(struct tcb *const tcp,
const kernel_ulong_t addr,

1
nlattr.h
View File

@ -56,6 +56,7 @@ DECL_NLA(s8);
DECL_NLA(s16);
DECL_NLA(s32);
DECL_NLA(s64);
DECL_NLA(be16);
DECL_NLA(be64);
DECL_NLA(str);
DECL_NLA(strn);

52
rtnl_neigh.c
View File

@ -42,6 +42,54 @@
#include "xlat/neighbor_cache_entry_states.h"
#include "xlat/rtnl_neigh_attrs.h"
static bool
decode_neigh_addr(struct tcb *const tcp,
const kernel_ulong_t addr,
const unsigned int len,
const void *const opaque_data)
{
const struct ndmsg *const ndmsg = opaque_data;
decode_inet_addr(tcp, addr, len, ndmsg->ndm_family, NULL);
return true;
}
static bool
decode_nda_cacheinfo(struct tcb *const tcp,
const kernel_ulong_t addr,
const unsigned int len,
const void *const opaque_data)
{
struct nda_cacheinfo ci;
if (len < sizeof(ci))
return false;
else if (!umove_or_printaddr(tcp, addr, &ci)) {
PRINT_FIELD_U("{", ci, ndm_confirmed);
PRINT_FIELD_U(", ", ci, ndm_used);
PRINT_FIELD_U(", ", ci, ndm_updated);
PRINT_FIELD_U(", ", ci, ndm_refcnt);
tprints("}");
}
return true;
}
static const nla_decoder_t ndmsg_nla_decoders[] = {
[NDA_DST] = decode_neigh_addr,
[NDA_LLADDR] = decode_neigh_addr,
[NDA_CACHEINFO] = decode_nda_cacheinfo,
[NDA_PROBES] = decode_nla_u32,
[NDA_VLAN] = decode_nla_u16,
[NDA_PORT] = decode_nla_be16,
[NDA_VNI] = decode_nla_u32,
[NDA_IFINDEX] = decode_nla_ifindex,
[NDA_MASTER] = decode_nla_ifindex,
[NDA_LINK_NETNSID] = decode_nla_u32,
[NDA_SRC_VNI] = NULL,
};
DECL_NETLINK_ROUTE_DECODER(decode_ndmsg)
{
struct ndmsg ndmsg = { .ndm_family = family };
@ -74,7 +122,9 @@ DECL_NETLINK_ROUTE_DECODER(decode_ndmsg)
if (decode_nla && len > offset) {
tprints(", ");
decode_nlattr(tcp, addr + offset, len - offset,
rtnl_neigh_attrs, "NDA_???", NULL, 0, NULL);
rtnl_neigh_attrs, "NDA_???",
ndmsg_nla_decoders,
ARRAY_SIZE(ndmsg_nla_decoders), &ndmsg);
}
}