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/*
* Copyright (c) 2016 Fabien Siron <fabien.siron@epita.fr>
* Copyright (c) 2017 JingPiao Chen <chenjingpiao@gmail.com>
* Copyright (c) 2016-2022 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 "netlink.h"
#include <linux/neighbour.h>
#include "xlat/fdb_notify_flags.h"
#include "xlat/neighbor_cache_entry_ext_flags.h"
#include "xlat/neighbor_cache_entry_flags.h"
#include "xlat/neighbor_cache_entry_states.h"
#include "xlat/rtnl_neigh_attrs.h"
#include "xlat/rtnl_neigh_fdb_ext_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)) {
tprint_struct_begin();
PRINT_FIELD_U(ci, ndm_confirmed);
tprint_struct_next();
PRINT_FIELD_U(ci, ndm_used);
tprint_struct_next();
PRINT_FIELD_U(ci, ndm_updated);
tprint_struct_next();
PRINT_FIELD_U(ci, ndm_refcnt);
tprint_struct_end();
}
return true;
}
static bool
decode_fdb_notify_flags(struct tcb *const tcp,
const kernel_ulong_t addr,
const unsigned int len,
const void *const opaque_data)
{
static const struct decode_nla_xlat_opts opts = {
fdb_notify_flags, "FDB_NOTIFY_???",
.size = 1,
};
return decode_nla_flags(tcp, addr, len, &opts);
}
static const nla_decoder_t nda_fdb_ext_attrs_nla_decoders[] = {
[NFEA_UNSPEC] = NULL,
[NFEA_ACTIVITY_NOTIFY] = decode_fdb_notify_flags,
[NFEA_DONT_REFRESH] = NULL, /* flag attr, no payload is expected */
};
static bool
decode_nda_fdb_ext_attrs(struct tcb *const tcp,
const kernel_ulong_t addr,
const unsigned int len,
const void *const opaque_data)
{
decode_nlattr(tcp, addr, len, rtnl_neigh_fdb_ext_attrs,
"NFEA_???", ARRSZ_PAIR(nda_fdb_ext_attrs_nla_decoders),
opaque_data);
return true;
}
static bool
decode_nda_ext_flags(struct tcb *const tcp,
const kernel_ulong_t addr,
const unsigned int len,
const void *const opaque_data)
{
static const struct decode_nla_xlat_opts opts = {
neighbor_cache_entry_ext_flags, "NTF_EXT_???",
.size = 4,
};
return decode_nla_flags(tcp, addr, len, &opts);
}
static bool
decode_nda_ndm_states(struct tcb *const tcp,
const kernel_ulong_t addr,
const unsigned int len,
const void *const opaque_data)
{
static const struct decode_nla_xlat_opts opts = {
neighbor_cache_entry_states, "NUD_???",
.size = 2,
};
return decode_nla_flags(tcp, addr, len, &opts);
}
static bool
decode_nda_ndm_flags(struct tcb *const tcp,
const kernel_ulong_t addr,
const unsigned int len,
const void *const opaque_data)
{
static const struct decode_nla_xlat_opts opts = {
neighbor_cache_entry_flags, "NTF_???",
.size = 1,
};
return decode_nla_flags(tcp, addr, len, &opts);
}
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] = decode_nla_u32,
[NDA_PROTOCOL] = decode_nla_ip_proto,
[NDA_NH_ID] = decode_nla_u32,
[NDA_FDB_EXT_ATTRS] = decode_nda_fdb_ext_attrs,
[NDA_FLAGS_EXT] = decode_nda_ext_flags,
[NDA_NDM_STATE_MASK] = decode_nda_ndm_states,
[NDA_NDM_FLAGS_MASK] = decode_nda_ndm_flags,
};
DECL_NETLINK_ROUTE_DECODER(decode_ndmsg)
{
struct ndmsg ndmsg = { .ndm_family = family };
size_t offset = sizeof(ndmsg.ndm_family);
bool decode_nla = false;
tprint_struct_begin();
PRINT_FIELD_XVAL(ndmsg, ndm_family, addrfams, "AF_???");
tprint_struct_next();
if (len >= sizeof(ndmsg)) {
if (!umoven_or_printaddr(tcp, addr + offset,
sizeof(ndmsg) - offset,
(char *) &ndmsg + offset)) {
PRINT_FIELD_IFINDEX(ndmsg, ndm_ifindex);
tprint_struct_next();
PRINT_FIELD_FLAGS(ndmsg, ndm_state,
neighbor_cache_entry_states,
"NUD_???");
tprint_struct_next();
PRINT_FIELD_FLAGS(ndmsg, ndm_flags,
neighbor_cache_entry_flags,
"NTF_???");
tprint_struct_next();
PRINT_FIELD_XVAL(ndmsg, ndm_type,
routing_types, "RTN_???");
decode_nla = true;
}
} else
tprint_more_data_follows();
tprint_struct_end();
offset = NLMSG_ALIGN(sizeof(ndmsg));
if (decode_nla && len > offset) {
tprint_array_next();
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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