netlink: add a basic rtnetlink parser of route messages

* defs.h (routing_scopes): New xlat prototype.
* rtnl_route.c: New file.
* Makefile.am (strace_SOURCES): Add it.
* netlink_route.h (decode_rtmsg): New prototype.
* netlink_route.c (route_decoders): Add RTM_DELROUTE, RTM_GETROUTE,
and RTM_NEWROUTE.
* xlat/ip_type_of_services.in: New file.
* xlat/routing_flags.in: Likewise.
* xlat/routing_protocols.in: Likewise.
* xlat/routing_table_ids.in: Likewise.
* xlat/routing_types.in: Likewise.

Co-authored-by: Fabien Siron <fabien.siron@epita.fr>

diff --git a/Makefile.am b/Makefile.am
index ff11a914e5fe9824bde5fe5e3f094623e8d632d5..cea4d94ae519de7489677cfa796eb7d6e4f69264 100644 (file)
--- a/Makefile.am
+++ b/Makefile.am
@@ -249,6 +249,7 @@ strace_SOURCES =    \
        rtc.c           \
        rtnl_addr.c     \
        rtnl_link.c     \
+       rtnl_route.c    \
        sched.c         \
        sched_attr.h    \
        scsi.c          \

diff --git a/defs.h b/defs.h
index 2efbfa3698019c4ef6f8921d952a5dbe84abd05b..8ce28c4f5be76f3405483f18bf207c0601526562 100644 (file)
--- a/defs.h
+++ b/defs.h
@@ -298,6 +298,7 @@ extern const struct xlat nl_route_types[];
 extern const struct xlat open_access_modes[];
 extern const struct xlat open_mode_flags[];
 extern const struct xlat resource_flags[];
+extern const struct xlat routing_scopes[];
 extern const struct xlat setns_types[];
 extern const struct xlat sg_io_info[];
 extern const struct xlat socketlayers[];

diff --git a/netlink_route.c b/netlink_route.c
index 5e3ed24c4f90513b07aa4d29f3f02a9a0215c727..e32d832b3b5bb3a3ef1f6600f0c06cd5f2186c25 100644 (file)
--- a/netlink_route.c
+++ b/netlink_route.c
@@ -61,7 +61,11 @@ static const netlink_route_decoder_t route_decoders[] = {
        [RTM_GETADDR - RTM_BASE] = decode_ifaddrmsg,
        [RTM_GETANYCAST - RTM_BASE] = decode_ifaddrmsg,
        [RTM_GETMULTICAST - RTM_BASE] = decode_ifaddrmsg,
-       [RTM_NEWADDR - RTM_BASE] = decode_ifaddrmsg
+       [RTM_NEWADDR - RTM_BASE] = decode_ifaddrmsg,
+
+       [RTM_DELROUTE - RTM_BASE] = decode_rtmsg,
+       [RTM_GETROUTE - RTM_BASE] = decode_rtmsg,
+       [RTM_NEWROUTE - RTM_BASE] = decode_rtmsg
 };
 
 bool

diff --git a/netlink_route.h b/netlink_route.h
index f644d612767e7f0fdf41ebad9046ea36630b82ac..02d37899da3c2eeb232e89e3bf5cbe4361592374 100644 (file)
--- a/netlink_route.h
+++ b/netlink_route.h
@@ -41,5 +41,6 @@ route_decode_name(struct tcb *tcp,                    \
 
 extern DECL_NETLINK_ROUTE_DECODER(decode_ifaddrmsg);
 extern DECL_NETLINK_ROUTE_DECODER(decode_ifinfomsg);
+extern DECL_NETLINK_ROUTE_DECODER(decode_rtmsg);
 
 #endif /* !STRACE_NETLINK_ROUTE_H */

diff --git a/rtnl_route.c b/rtnl_route.c
new file mode 100644 (file)
index 0000000..f25d038
--- /dev/null
+++ b/rtnl_route.c
@@ -0,0 +1,74 @@
+/*
+ * 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 "print_fields.h"
+
+#include <linux/ip.h>
+#include "netlink.h"
+#include <linux/rtnetlink.h>
+
+#include "xlat/ip_type_of_services.h"
+#include "xlat/routing_flags.h"
+#include "xlat/routing_protocols.h"
+#include "xlat/routing_table_ids.h"
+#include "xlat/routing_types.h"
+
+DECL_NETLINK_ROUTE_DECODER(decode_rtmsg)
+{
+       struct rtmsg rtmsg = { .rtm_family = family };
+       const size_t offset = sizeof(rtmsg.rtm_family);
+
+       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_???");
+               }
+       } else
+               tprints("...");
+       tprints("}");
+}

diff --git a/xlat/ip_type_of_services.in b/xlat/ip_type_of_services.in
new file mode 100644 (file)
index 0000000..41c526a
--- /dev/null
+++ b/xlat/ip_type_of_services.in
@@ -0,0 +1,4 @@
+IPTOS_LOWDELAY
+IPTOS_THROUGHPUT
+IPTOS_RELIABILITY
+IPTOS_MINCOST

diff --git a/xlat/routing_flags.in b/xlat/routing_flags.in
new file mode 100644 (file)
index 0000000..fe66b67
--- /dev/null
+++ b/xlat/routing_flags.in
@@ -0,0 +1,5 @@
+RTM_F_NOTIFY
+RTM_F_CLONED
+RTM_F_EQUALIZE
+RTM_F_PREFIX
+RTM_F_LOOKUP_TABLE

diff --git a/xlat/routing_protocols.in b/xlat/routing_protocols.in
new file mode 100644 (file)
index 0000000..d366b67
--- /dev/null
+++ b/xlat/routing_protocols.in
@@ -0,0 +1,16 @@
+RTPROT_UNSPEC
+RTPROT_REDIRECT
+RTPROT_KERNEL
+RTPROT_BOOT
+RTPROT_STATIC
+RTPROT_GATED
+RTPROT_RA
+RTPROT_MRT
+RTPROT_ZEBRA
+RTPROT_BIRD
+RTPROT_DNROUTED
+RTPROT_XORP
+RTPROT_NTK
+RTPROT_DHCP
+RTPROT_MROUTED
+RTPROT_BABEL

diff --git a/xlat/routing_table_ids.in b/xlat/routing_table_ids.in
new file mode 100644 (file)
index 0000000..6a1f797
--- /dev/null
+++ b/xlat/routing_table_ids.in
@@ -0,0 +1,5 @@
+RT_TABLE_UNSPEC                0
+RT_TABLE_COMPAT                252
+RT_TABLE_DEFAULT       253
+RT_TABLE_MAIN          254
+RT_TABLE_LOCAL         255

diff --git a/xlat/routing_types.in b/xlat/routing_types.in
new file mode 100644 (file)
index 0000000..f7079d4
--- /dev/null
+++ b/xlat/routing_types.in
@@ -0,0 +1,12 @@
+RTN_UNSPEC     0
+RTN_UNICAST    1
+RTN_LOCAL      2
+RTN_BROADCAST  3
+RTN_ANYCAST    4
+RTN_MULTICAST  5
+RTN_BLACKHOLE  6
+RTN_UNREACHABLE        7
+RTN_PROHIBIT   8
+RTN_THROW      9
+RTN_NAT                10
+RTN_XRESOLVE   11