blob: 102b8057cf23ae9368667f8fe17ba4e2be331a8a [file] [log] [blame]
/*
* Copyright (c) 2016 Fabien Siron <fabien.siron@epita.fr>
* Copyright (c) 2017 JingPiao Chen <chenjingpiao@gmail.com>
* Copyright (c) 2016-2017 The strace developers.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "defs.h"
#include "netlink_route.h"
#include "nlattr.h"
#include "print_fields.h"
#include <linux/ip.h>
#include "netlink.h"
#include <linux/rtnetlink.h>
#include "xlat/ip_type_of_services.h"
#include "xlat/lwtunnel_encap_types.h"
#include "xlat/route_nexthop_flags.h"
#include "xlat/routing_flags.h"
#include "xlat/routing_protocols.h"
#include "xlat/routing_table_ids.h"
#include "xlat/routing_types.h"
#include "xlat/rtnl_route_attrs.h"
#include "xlat/rtnl_rta_metrics_attrs.h"
bool
decode_nla_rt_class(struct tcb *const tcp,
const kernel_ulong_t addr,
const unsigned int len,
const void *const opaque_data)
{
uint32_t num;
if (len < sizeof(num))
return false;
if (!umove_or_printaddr(tcp, addr, &num))
printxval(routing_table_ids, num, NULL);
return true;
}
static bool
decode_route_addr(struct tcb *const tcp,
const kernel_ulong_t addr,
const unsigned int len,
const void *const opaque_data)
{
const struct rtmsg *const rtmsg = opaque_data;
decode_inet_addr(tcp, addr, len, rtmsg->rtm_family, NULL);
return true;
}
static const nla_decoder_t rta_metrics_nla_decoders[] = {
[RTAX_LOCK] = decode_nla_u32,
[RTAX_MTU] = decode_nla_u32,
[RTAX_WINDOW] = decode_nla_u32,
[RTAX_RTT] = decode_nla_u32,
[RTAX_RTTVAR] = decode_nla_u32,
[RTAX_SSTHRESH] = decode_nla_u32,
[RTAX_CWND] = decode_nla_u32,
[RTAX_ADVMSS] = decode_nla_u32,
[RTAX_REORDERING] = decode_nla_u32,
[RTAX_HOPLIMIT] = decode_nla_u32,
[RTAX_INITCWND] = decode_nla_u32,
[RTAX_FEATURES] = decode_nla_u32,
[RTAX_RTO_MIN] = decode_nla_u32,
[RTAX_INITRWND] = decode_nla_u32,
[RTAX_QUICKACK] = decode_nla_u32,
[RTAX_CC_ALGO] = decode_nla_str
};
static bool
decode_rta_metrics(struct tcb *const tcp,
const kernel_ulong_t addr,
const unsigned int len,
const void *const opaque_data)
{
decode_nlattr(tcp, addr, len, rtnl_rta_metrics_attrs,
"RTAX_???", rta_metrics_nla_decoders,
ARRAY_SIZE(rta_metrics_nla_decoders), opaque_data);
return true;
}
static bool
decode_rta_multipath(struct tcb *const tcp,
const kernel_ulong_t addr,
const unsigned int len,
const void *const opaque_data);
static bool
decode_rta_cacheinfo(struct tcb *const tcp,
const kernel_ulong_t addr,
const unsigned int len,
const void *const opaque_data)
{
struct rta_cacheinfo ci;
if (len < sizeof(ci))
return false;
else if (!umove_or_printaddr(tcp, addr, &ci)) {
PRINT_FIELD_U("{", ci, rta_clntref);
PRINT_FIELD_U(", ", ci, rta_lastuse);
PRINT_FIELD_U(", ", ci, rta_expires);
PRINT_FIELD_U(", ", ci, rta_error);
PRINT_FIELD_U(", ", ci, rta_used);
PRINT_FIELD_X(", ", ci, rta_id);
PRINT_FIELD_U(", ", ci, rta_ts);
PRINT_FIELD_U(", ", ci, rta_tsage);
tprints("}");
}
return true;
}
static bool
decode_rta_mfc_stats(struct tcb *const tcp,
const kernel_ulong_t addr,
const unsigned int len,
const void *const opaque_data)
{
#ifdef HAVE_STRUCT_RTA_MFC_STATS
struct rta_mfc_stats mfcs;
if (len < sizeof(mfcs))
return false;
else if (!umove_or_printaddr(tcp, addr, &mfcs)) {
PRINT_FIELD_U("{", mfcs, mfcs_packets);
PRINT_FIELD_U(", ", mfcs, mfcs_bytes);
PRINT_FIELD_U(", ", mfcs, mfcs_wrong_if);
tprints("}");
}
return true;
#else
return false;
#endif
}
static bool
decode_rtvia(struct tcb *const tcp,
const kernel_ulong_t addr,
const unsigned int len,
const void *const opaque_data)
{
#ifdef HAVE_STRUCT_RTVIA
struct rtvia via;
if (len < sizeof(via))
return false;
else if (!umove_or_printaddr(tcp, addr, &via)) {
PRINT_FIELD_XVAL("{", via, rtvia_family, addrfams, "AF_???");
const unsigned int offset = offsetof(struct rtvia, rtvia_addr);
if (len > offset) {
tprints(", ");
decode_inet_addr(tcp, addr + offset, len - offset,
via.rtvia_family, "rtvia_addr");
}
tprints("}");
}
return true;
#else
return false;
#endif
}
static bool
decode_rta_encap_type(struct tcb *const tcp,
const kernel_ulong_t addr,
const unsigned int len,
const void *const opaque_data)
{
uint16_t type;
if (len < sizeof(type))
return false;
else if (!umove_or_printaddr(tcp, addr, &type))
printxval(lwtunnel_encap_types, type, "LWTUNNEL_ENCAP_???");
return true;
}
static const nla_decoder_t rtmsg_nla_decoders[] = {
[RTA_DST] = decode_route_addr,
[RTA_SRC] = decode_route_addr,
[RTA_IIF] = decode_nla_ifindex,
[RTA_OIF] = decode_nla_ifindex,
[RTA_GATEWAY] = decode_route_addr,
[RTA_PRIORITY] = decode_nla_u32,
[RTA_PREFSRC] = decode_route_addr,
[RTA_METRICS] = decode_rta_metrics,
[RTA_MULTIPATH] = decode_rta_multipath,
[RTA_PROTOINFO] = decode_nla_u32,
[RTA_FLOW] = decode_nla_u32,
[RTA_CACHEINFO] = decode_rta_cacheinfo,
[RTA_SESSION] = NULL, /* unused */
[RTA_MP_ALGO] = decode_nla_u32,
[RTA_TABLE] = decode_nla_rt_class,
[RTA_MARK] = decode_nla_u32,
[RTA_MFC_STATS] = decode_rta_mfc_stats,
[RTA_VIA] = decode_rtvia,
[RTA_NEWDST] = decode_route_addr,
[RTA_PREF] = decode_nla_u8,
[RTA_ENCAP_TYPE] = decode_rta_encap_type,
[RTA_ENCAP] = NULL, /* unimplemented */
[RTA_EXPIRES] = decode_nla_u64,
[RTA_PAD] = NULL,
[RTA_UID] = decode_nla_u32,
[RTA_TTL_PROPAGATE] = decode_nla_u8
};
static bool
decode_rta_multipath(struct tcb *const tcp,
const kernel_ulong_t addr,
const unsigned int len,
const void *const opaque_data)
{
struct rtnexthop nh;
if (len < sizeof(nh))
return false;
else if (!umove_or_printaddr(tcp, addr, &nh)) {
/* print the whole structure regardless of its rtnh_len */
PRINT_FIELD_U("{", nh, rtnh_len);
PRINT_FIELD_FLAGS(", ", nh, rtnh_flags,
route_nexthop_flags, "RTNH_F_???");
PRINT_FIELD_U(", ", nh, rtnh_hops);
PRINT_FIELD_IFINDEX(", ", nh, rtnh_ifindex);
tprints("}");
const unsigned short rtnh_len =
len < nh.rtnh_len ? len : nh.rtnh_len;
const size_t offset = RTNH_ALIGN(sizeof(nh));
if (rtnh_len > offset) {
tprints(", ");
decode_nlattr(tcp, addr + offset, rtnh_len - offset,
rtnl_route_attrs, "RTA_???",
rtmsg_nla_decoders,
ARRAY_SIZE(rtmsg_nla_decoders),
opaque_data);
}
}
return true;
}
DECL_NETLINK_ROUTE_DECODER(decode_rtmsg)
{
struct rtmsg rtmsg = { .rtm_family = family };
size_t offset = sizeof(rtmsg.rtm_family);
bool decode_nla = false;
PRINT_FIELD_XVAL("{", rtmsg, rtm_family, addrfams, "AF_???");
tprints(", ");
if (len >= sizeof(rtmsg)) {
if (!umoven_or_printaddr(tcp, addr + offset,
sizeof(rtmsg) - offset,
(void *) &rtmsg + offset)) {
PRINT_FIELD_U("", rtmsg, rtm_dst_len);
PRINT_FIELD_U(", ", rtmsg, rtm_src_len);
PRINT_FIELD_FLAGS(", ", rtmsg, rtm_tos,
ip_type_of_services, "IPTOS_TOS_???");
PRINT_FIELD_XVAL(", ", rtmsg, rtm_table,
routing_table_ids, NULL);
PRINT_FIELD_XVAL(", ", rtmsg, rtm_protocol,
routing_protocols, "RTPROT_???");
PRINT_FIELD_XVAL(", ", rtmsg, rtm_scope,
routing_scopes, NULL);
PRINT_FIELD_XVAL(", ", rtmsg, rtm_type,
routing_types, "RTN_???");
PRINT_FIELD_FLAGS(", ", rtmsg, rtm_flags,
routing_flags, "RTM_F_???");
decode_nla = true;
}
} else
tprints("...");
tprints("}");
offset = NLMSG_ALIGN(sizeof(rtmsg));
if (decode_nla && len > offset) {
tprints(", ");
decode_nlattr(tcp, addr + offset, len - offset,
rtnl_route_attrs, "RTA_???",
rtmsg_nla_decoders,
ARRAY_SIZE(rtmsg_nla_decoders), &rtmsg);
}
}