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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
*/
#include "defs.h"
#include "netlink_route.h"
#include "nlattr.h"
#include "print_fields.h"
#include "netlink.h"
#include <linux/rtnetlink.h>
#ifdef HAVE_LINUX_NEIGHBOUR_H
# include <linux/neighbour.h>
#endif
#include "xlat/neighbor_cache_entry_flags.h"
#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_nla_hwaddr_nofamily,
[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,
[NDA_PROTOCOL] = decode_nla_u8,
[NDA_NH_ID] = decode_nla_u32,
};
DECL_NETLINK_ROUTE_DECODER(decode_ndmsg)
{
struct ndmsg ndmsg = { .ndm_family = family };
size_t offset = sizeof(ndmsg.ndm_family);
bool decode_nla = false;
PRINT_FIELD_XVAL("{", ndmsg, ndm_family, addrfams, "AF_???");
tprints(", ");
if (len >= sizeof(ndmsg)) {
if (!umoven_or_printaddr(tcp, addr + offset,
sizeof(ndmsg) - offset,
(char *) &ndmsg + offset)) {
PRINT_FIELD_IFINDEX("", ndmsg, ndm_ifindex);
PRINT_FIELD_FLAGS(", ", ndmsg, ndm_state,
neighbor_cache_entry_states,
"NUD_???");
PRINT_FIELD_FLAGS(", ", ndmsg, ndm_flags,
neighbor_cache_entry_flags,
"NTF_???");
PRINT_FIELD_XVAL(", ", ndmsg, ndm_type,
routing_types, "RTN_???");
decode_nla = true;
}
} else
tprints("...");
tprints("}");
offset = NLMSG_ALIGN(sizeof(ndmsg));
if (decode_nla && len > offset) {
tprints(", ");
decode_nlattr(tcp, addr + offset, len - offset,
rtnl_neigh_attrs, "NDA_???",
ndmsg_nla_decoders,
ARRAY_SIZE(ndmsg_nla_decoders), &ndmsg);
}
}
DECL_NETLINK_ROUTE_DECODER(decode_rtm_getneigh)
{
if (family == AF_BRIDGE)
decode_ifinfomsg(tcp, nlmsghdr, family, addr, len);
else
decode_ndmsg(tcp, nlmsghdr, family, addr, len);
}
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