[PATCH v2 7/8] netlink: add a basic rtnetlink parser of link messages
JingPiao Chen
chenjingpiao at gmail.com
Mon Jul 31 23:48:47 UTC 2017
* netlink_route.h: New file.
* rtnl_link.c: Likewise.
* Makefile.am (strace_SOURCES): Add them.
* defs.h (arp_hardware_types, iffflags): New xlat prototypes.
* netlink_route.c: Include "netlink_route.h"
and <linux/rtnetlink.h>.
(netlink_route_decoder_t): New typedef.
(route_decoders): New array.
(decode_netlink_route): Use it.
Co-authored-by: Fabien Siron <fabien.siron at epita.fr>
---
Makefile.am | 2 ++
defs.h | 2 ++
netlink_route.c | 24 ++++++++++++++++++++++--
netlink_route.h | 44 +++++++++++++++++++++++++++++++++++++++++++
rtnl_link.c | 58 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 128 insertions(+), 2 deletions(-)
create mode 100644 netlink_route.h
create mode 100644 rtnl_link.c
diff --git a/Makefile.am b/Makefile.am
index d10811c..5981f4c 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -189,6 +189,7 @@ strace_SOURCES = \
netlink_netlink_diag.c \
netlink_packet_diag.c \
netlink_route.c \
+ netlink_route.h \
netlink_selinux.c \
netlink_smc_diag.c \
netlink_sock_diag.c \
@@ -242,6 +243,7 @@ strace_SOURCES = \
rt_sigframe.c \
rt_sigreturn.c \
rtc.c \
+ rtnl_link.c \
sched.c \
sched_attr.h \
scsi.c \
diff --git a/defs.h b/defs.h
index d70323c..3da1184 100644
--- a/defs.h
+++ b/defs.h
@@ -282,11 +282,13 @@ struct tcb {
#include "xlat.h"
extern const struct xlat addrfams[];
+extern const struct xlat arp_hardware_types[];
extern const struct xlat at_flags[];
extern const struct xlat clocknames[];
extern const struct xlat dirent_types[];
extern const struct xlat ethernet_protocols[];
extern const struct xlat evdev_abs[];
+extern const struct xlat iffflags[];
extern const struct xlat inet_protocols[];
extern const struct xlat msg_flags[];
extern const struct xlat netlink_protocols[];
diff --git a/netlink_route.c b/netlink_route.c
index dc5a13f..c6338fd 100644
--- a/netlink_route.c
+++ b/netlink_route.c
@@ -29,6 +29,9 @@
#include "defs.h"
#include "netlink.h"
+#include "netlink_route.h"
+
+#include <linux/rtnetlink.h>
#include "xlat/nl_route_types.h"
@@ -46,19 +49,36 @@ decode_family(struct tcb *const tcp, const uint8_t family,
tprints("}");
}
+typedef DECL_NETLINK_ROUTE_DECODER((*netlink_route_decoder_t));
+
+static const netlink_route_decoder_t route_decoders[] = {
+ [RTM_DELLINK - RTM_BASE] = decode_ifinfomsg,
+ [RTM_GETLINK - RTM_BASE] = decode_ifinfomsg,
+ [RTM_NEWLINK - RTM_BASE] = decode_ifinfomsg,
+ [RTM_SETLINK - RTM_BASE] = decode_ifinfomsg
+};
+
bool
decode_netlink_route(struct tcb *const tcp,
const struct nlmsghdr *const nlmsghdr,
const kernel_ulong_t addr,
const unsigned int len)
{
+ unsigned int type = nlmsghdr->nlmsg_type;
uint8_t family;
if (nlmsghdr->nlmsg_type == NLMSG_DONE)
return false;
- if (!umove_or_printaddr(tcp, addr, &family))
- decode_family(tcp, family, addr, len);
+ if (!umove_or_printaddr(tcp, addr, &family)) {
+ if (type >= RTM_BASE
+ && type - RTM_BASE < ARRAY_SIZE(route_decoders)
+ && route_decoders[type - RTM_BASE]) {
+ route_decoders[type - RTM_BASE](tcp, nlmsghdr,
+ family, addr, len);
+ } else
+ decode_family(tcp, family, addr, len);
+ }
return true;
}
diff --git a/netlink_route.h b/netlink_route.h
new file mode 100644
index 0000000..cc2b5c2
--- /dev/null
+++ b/netlink_route.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2016 Fabien Siron <fabien.siron at epita.fr>
+ * Copyright (c) 2017 JingPiao Chen <chenjingpiao at 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.
+ */
+
+#ifndef STRACE_NETLINK_ROUTE_H
+#define STRACE_NETLINK_ROUTE_H
+
+#define DECL_NETLINK_ROUTE_DECODER(route_decode_name) \
+void \
+route_decode_name(struct tcb *tcp, \
+ const struct nlmsghdr *nlmsghdr, \
+ uint8_t family, \
+ kernel_ulong_t addr, \
+ unsigned int len) \
+/* End of DECL_NETLINK_ROUTE_DECODER definition. */
+
+extern DECL_NETLINK_ROUTE_DECODER(decode_ifinfomsg);
+
+#endif /* !STRACE_NETLINK_ROUTE_H */
diff --git a/rtnl_link.c b/rtnl_link.c
new file mode 100644
index 0000000..876baff
--- /dev/null
+++ b/rtnl_link.c
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2016 Fabien Siron <fabien.siron at epita.fr>
+ * Copyright (c) 2017 JingPiao Chen <chenjingpiao at 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/rtnetlink.h>
+
+DECL_NETLINK_ROUTE_DECODER(decode_ifinfomsg)
+{
+ struct ifinfomsg ifinfo = { .ifi_family = family };
+ const size_t offset = sizeof(ifinfo.ifi_family);
+
+ PRINT_FIELD_XVAL("{", ifinfo, ifi_family, addrfams, "AF_???");
+
+ tprints(", ");
+ if (len >= sizeof(ifinfo)) {
+ if (!umoven_or_printaddr(tcp, addr + offset,
+ sizeof(ifinfo) - offset,
+ (void *) &ifinfo + offset)) {
+ PRINT_FIELD_XVAL("", ifinfo, ifi_type,
+ arp_hardware_types, "ARPHRD_???");
+ PRINT_FIELD_IFINDEX(", ", ifinfo, ifi_index);
+ PRINT_FIELD_FLAGS(", ", ifinfo, ifi_flags,
+ iffflags, "IFF_???");
+ PRINT_FIELD_X(", ", ifinfo, ifi_change);
+ }
+ } else
+ tprints("...");
+ tprints("}");
+}
--
2.7.4
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