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/*
* Copyright (c) 2016 Fabien Siron <fabien.siron@epita.fr>
* Copyright (c) 2017 JingPiao Chen <chenjingpiao@gmail.com>
* Copyright (c) 2016-2018 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 <netinet/in.h>
#include <linux/if_bridge.h>
#include "netlink.h"
#include "xlat/mdb_flags.h"
#include "xlat/mdb_states.h"
#include "xlat/multicast_router_types.h"
#include "xlat/rtnl_mdb_attrs.h"
#include "xlat/rtnl_mdba_mdb_attrs.h"
#include "xlat/rtnl_mdba_mdb_eattr_attrs.h"
#include "xlat/rtnl_mdba_mdb_entry_attrs.h"
#include "xlat/rtnl_mdba_router_attrs.h"
#include "xlat/rtnl_mdba_router_pattr_attrs.h"
typedef struct {
uint8_t family;
uint32_t ifindex;
} struct_br_port_msg;
typedef struct {
uint32_t ifindex;
uint8_t state;
uint8_t flags;
uint16_t vid;
struct {
union {
uint32_t /* __be32 */ ip4;
struct in6_addr ip6;
} u;
uint16_t /* __be16 */ proto;
} addr;
} struct_br_mdb_entry;
#ifdef HAVE_STRUCT_BR_PORT_MSG
static_assert(sizeof(struct br_port_msg) <= sizeof(struct_br_port_msg),
"Unexpected struct br_port_msg size, please update the decoder");
#endif
#ifdef HAVE_STRUCT_BR_NDB_ENTRY
static_assert(sizeof(struct br_mdb_entry) <= sizeof(struct_br_mdb_entry),
"Unexpected struct br_mdb_entry size, please update the decoder");
#endif
static const nla_decoder_t mdba_mdb_eattr_nla_decoders[] = {
[MDBA_MDB_EATTR_TIMER] = decode_nla_u32
};
static bool
decode_mdba_mdb_entry_info(struct tcb *const tcp,
const kernel_ulong_t addr,
const unsigned int len,
const void *const opaque_data)
{
struct_br_mdb_entry entry;
if (len < sizeof(entry))
return false;
else if (!umove_or_printaddr(tcp, addr, &entry)) {
PRINT_FIELD_IFINDEX("{", entry, ifindex);
PRINT_FIELD_XVAL(", ", entry, state, mdb_states, "MDB_???");
/*
* Note that it's impossible to derive if flags/vid fields
* are present on all architectures except m68k; as a side note,
* v4.3-rc1~96^2~365 has introduced an ABI breakage on m68k.
*/
PRINT_FIELD_FLAGS(", ", entry, flags,
mdb_flags, "MDB_FLAGS_???");
PRINT_FIELD_U(", ", entry, vid);
const int proto = ntohs(entry.addr.proto);
tprints(", addr={");
print_inet_addr(proto, &entry.addr.u,
sizeof(entry.addr.u), "u");
tprints(", proto=htons(");
printxval(addrfams, proto, "AF_???");
tprints(")}}");
}
const size_t offset = NLMSG_ALIGN(sizeof(entry));
if (len > offset) {
tprints(", ");
decode_nlattr(tcp, addr + offset, len - offset,
rtnl_mdba_mdb_eattr_attrs, "MDBA_MDB_EATTR_???",
mdba_mdb_eattr_nla_decoders,
ARRAY_SIZE(mdba_mdb_eattr_nla_decoders), NULL);
}
return true;
}
static const nla_decoder_t mdba_mdb_entry_nla_decoders[] = {
[MDBA_MDB_ENTRY_INFO] = decode_mdba_mdb_entry_info
};
static bool
decode_mdba_mdb_entry(struct tcb *const tcp,
const kernel_ulong_t addr,
const unsigned int len,
const void *const opaque_data)
{
decode_nlattr(tcp, addr, len, rtnl_mdba_mdb_entry_attrs,
"MDBA_MDB_ENTRY_???", mdba_mdb_entry_nla_decoders,
ARRAY_SIZE(mdba_mdb_entry_nla_decoders), NULL);
return true;
}
static const nla_decoder_t mdba_mdb_nla_decoders[] = {
[MDBA_MDB_ENTRY] = decode_mdba_mdb_entry
};
static bool
decode_mdba_mdb(struct tcb *const tcp,
const kernel_ulong_t addr,
const unsigned int len,
const void *const opaque_data)
{
decode_nlattr(tcp, addr, len, rtnl_mdba_mdb_attrs, "MDBA_MDB_???",
mdba_mdb_nla_decoders,
ARRAY_SIZE(mdba_mdb_nla_decoders), NULL);
return true;
}
static bool
decode_multicast_router_type(struct tcb *const tcp,
const kernel_ulong_t addr,
const unsigned int len,
const void *const opaque_data)
{
uint8_t type;
if (!umove_or_printaddr(tcp, addr, &type))
printxval(multicast_router_types, type, "MDB_RTR_TYPE_???");
return true;
}
static const nla_decoder_t mdba_router_pattr_nla_decoders[] = {
[MDBA_ROUTER_PATTR_TIMER] = decode_nla_u32,
[MDBA_ROUTER_PATTR_TYPE] = decode_multicast_router_type
};
static bool
decode_mdba_router_port(struct tcb *const tcp,
const kernel_ulong_t addr,
const unsigned int len,
const void *const opaque_data)
{
uint32_t ifindex;
if (len < sizeof(ifindex))
return false;
else if (!umove_or_printaddr(tcp, addr, &ifindex))
print_ifindex(ifindex);
const size_t offset = NLMSG_ALIGN(sizeof(ifindex));
if (len > offset) {
tprints(", ");
decode_nlattr(tcp, addr + offset, len - offset,
rtnl_mdba_router_pattr_attrs,
"MDBA_ROUTER_PATTR_???",
mdba_router_pattr_nla_decoders,
ARRAY_SIZE(mdba_router_pattr_nla_decoders), NULL);
}
return true;
}
static const nla_decoder_t mdba_router_nla_decoders[] = {
[MDBA_ROUTER_PORT] = decode_mdba_router_port
};
static bool
decode_mdba_router(struct tcb *const tcp,
const kernel_ulong_t addr,
const unsigned int len,
const void *const opaque_data)
{
decode_nlattr(tcp, addr, len, rtnl_mdba_router_attrs, "MDBA_ROUTER_???",
mdba_router_nla_decoders,
ARRAY_SIZE(mdba_router_nla_decoders), NULL);
return true;
}
static const nla_decoder_t br_port_msg_nla_decoders[] = {
[MDBA_MDB] = decode_mdba_mdb,
[MDBA_ROUTER] = decode_mdba_router
};
DECL_NETLINK_ROUTE_DECODER(decode_br_port_msg)
{
struct_br_port_msg bpm = { .family = family };
size_t offset = sizeof(bpm.family);
bool decode_nla = false;
PRINT_FIELD_XVAL("{", bpm, family, addrfams, "AF_???");
tprints(", ");
if (len >= sizeof(bpm)) {
if (!umoven_or_printaddr(tcp, addr + offset,
sizeof(bpm) - offset,
(char *) &bpm + offset)) {
PRINT_FIELD_IFINDEX("", bpm, ifindex);
decode_nla = true;
}
} else
tprints("...");
tprints("}");
offset = NLMSG_ALIGN(sizeof(bpm));
if (decode_nla && len > offset) {
tprints(", ");
decode_nlattr(tcp, addr + offset, len - offset,
rtnl_mdb_attrs, "MDBA_???",
br_port_msg_nla_decoders,
ARRAY_SIZE(br_port_msg_nla_decoders), NULL);
}
}
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