[PATCH 08/26] netlink: add a basic rtnetlink parser of neigh messages
JingPiao Chen
chenjingpiao at gmail.com
Thu Aug 10 01:07:06 UTC 2017
* rtnl_neigh.c: New file.
* Makefile.am (strace_SOURCES): Add it.
* netlink_route.h (decode_ndmsg, decode_rtm_getneigh): New prototypes.
* configure.ac (AC_CHECK_HEADERS): Add linux/neighbour.h.
* netlink_route.c (route_decoders): Add RTM_DELNEIGH,
RTM_DELNEIGH and RTM_NEWNEIGH.
* xlat/nda_types.in: New file.
* xlat/neighbor_cache_entry_flags.in: Likewise.
* xlat/neighbor_cache_entry_states.in: Likewise.
Co-authored-by: Fabien Siron <fabien.siron at epita.fr>
---
Makefile.am | 1 +
configure.ac | 1 +
netlink_route.c | 8 +++-
netlink_route.h | 2 +
rtnl_neigh.c | 76 +++++++++++++++++++++++++++++++++++++
xlat/nda_types.in | 11 ++++++
xlat/neighbor_cache_entry_flags.in | 6 +++
xlat/neighbor_cache_entry_states.in | 9 +++++
8 files changed, 112 insertions(+), 2 deletions(-)
create mode 100644 rtnl_neigh.c
create mode 100644 xlat/nda_types.in
create mode 100644 xlat/neighbor_cache_entry_flags.in
create mode 100644 xlat/neighbor_cache_entry_states.in
diff --git a/Makefile.am b/Makefile.am
index 404a620..0540d31 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -249,6 +249,7 @@ strace_SOURCES = \
rtc.c \
rtnl_addr.c \
rtnl_link.c \
+ rtnl_neigh.c \
rtnl_route.c \
rtnl_rule.c \
sched.c \
diff --git a/configure.ac b/configure.ac
index 6948cd0..5b547b2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -382,6 +382,7 @@ AC_CHECK_HEADERS(m4_normalize([
linux/ipc.h
linux/mmtimer.h
linux/msg.h
+ linux/neighbour.h
linux/netfilter/nfnetlink.h
linux/nsfs.h
linux/perf_event.h
diff --git a/netlink_route.c b/netlink_route.c
index 654d081..2cd2336 100644
--- a/netlink_route.c
+++ b/netlink_route.c
@@ -70,12 +70,16 @@ static const netlink_route_decoder_t route_decoders[] = {
#ifdef HAVE_STRUCT_FIB_RULE_HDR
[RTM_DELRULE - RTM_BASE] = decode_fib_rule_hdr,
[RTM_GETRULE - RTM_BASE] = decode_fib_rule_hdr,
- [RTM_NEWRULE - RTM_BASE] = decode_fib_rule_hdr
+ [RTM_NEWRULE - RTM_BASE] = decode_fib_rule_hdr,
#else
[RTM_DELRULE - RTM_BASE] = decode_rtmsg,
[RTM_GETRULE - RTM_BASE] = decode_rtmsg,
- [RTM_NEWRULE - RTM_BASE] = decode_rtmsg
+ [RTM_NEWRULE - RTM_BASE] = decode_rtmsg,
#endif
+
+ [RTM_DELNEIGH - RTM_BASE] = decode_ndmsg,
+ [RTM_GETNEIGH - RTM_BASE] = decode_rtm_getneigh,
+ [RTM_NEWNEIGH - RTM_BASE] = decode_ndmsg
};
bool
diff --git a/netlink_route.h b/netlink_route.h
index 0d89bcd..60e9e75 100644
--- a/netlink_route.h
+++ b/netlink_route.h
@@ -42,6 +42,8 @@ route_decode_name(struct tcb *tcp, \
extern DECL_NETLINK_ROUTE_DECODER(decode_fib_rule_hdr);
extern DECL_NETLINK_ROUTE_DECODER(decode_ifaddrmsg);
extern DECL_NETLINK_ROUTE_DECODER(decode_ifinfomsg);
+extern DECL_NETLINK_ROUTE_DECODER(decode_ndmsg);
+extern DECL_NETLINK_ROUTE_DECODER(decode_rtm_getneigh);
extern DECL_NETLINK_ROUTE_DECODER(decode_rtmsg);
#endif /* !STRACE_NETLINK_ROUTE_H */
diff --git a/rtnl_neigh.c b/rtnl_neigh.c
new file mode 100644
index 0000000..3d702ef
--- /dev/null
+++ b/rtnl_neigh.c
@@ -0,0 +1,76 @@
+/*
+ * 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 <sys/socket.h>
+#ifdef HAVE_LINUX_NEIGHBOUR_H
+# include <linux/neighbour.h>
+#endif
+
+#include "xlat/nda_types.h"
+#include "xlat/neighbor_cache_entry_flags.h"
+#include "xlat/neighbor_cache_entry_states.h"
+
+DECL_NETLINK_ROUTE_DECODER(decode_ndmsg)
+{
+ struct ndmsg ndmsg = { .ndm_family = family };
+ const size_t offset = sizeof(ndmsg.ndm_family);
+
+ PRINT_FIELD_XVAL("{", ndmsg, ndm_family, addrfams, "AF_???");
+
+ tprints(", ");
+ if (len >= sizeof(ndmsg)) {
+ if (!umoven_or_printaddr(tcp, addr + offset,
+ sizeof(ndmsg) - offset,
+ (void *) &ndmsg + offset)) {
+ PRINT_FIELD_IFINDEX("", ndmsg, ndm_ifindex);
+ PRINT_FIELD_FLAGS(", ", ndmsg, ndm_state,
+ neighbor_cache_entry_states,
+ "NUD_???");
+ PRINT_FIELD_FLAGS(", ", ndmsg, ndm_flags,
+ neighbor_cache_entry_flags,
+ "NTF_???");
+ PRINT_FIELD_XVAL(", ", ndmsg, ndm_type,
+ nda_types, "NDA_???");
+ }
+ } else
+ tprints("...");
+ tprints("}");
+}
+
+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);
+}
diff --git a/xlat/nda_types.in b/xlat/nda_types.in
new file mode 100644
index 0000000..08f3066
--- /dev/null
+++ b/xlat/nda_types.in
@@ -0,0 +1,11 @@
+NDA_UNSPEC 0
+NDA_DST 1
+NDA_LLADDR 2
+NDA_CACHEINFO 3
+NDA_PROBES 4
+NDA_VLAN 5
+NDA_PORT 6
+NDA_VNI 7
+NDA_IFINDEX 8
+NDA_MASTER 9
+NDA_LINK_NETNSID 10
diff --git a/xlat/neighbor_cache_entry_flags.in b/xlat/neighbor_cache_entry_flags.in
new file mode 100644
index 0000000..6a210f5
--- /dev/null
+++ b/xlat/neighbor_cache_entry_flags.in
@@ -0,0 +1,6 @@
+NTF_USE
+NTF_SELF
+NTF_MASTER
+NTF_PROXY
+NTF_EXT_LEARNED
+NTF_ROUTER
diff --git a/xlat/neighbor_cache_entry_states.in b/xlat/neighbor_cache_entry_states.in
new file mode 100644
index 0000000..5ae9c4d
--- /dev/null
+++ b/xlat/neighbor_cache_entry_states.in
@@ -0,0 +1,9 @@
+NUD_INCOMPLETE
+NUD_REACHABLE
+NUD_STALE
+NUD_DELAY
+NUD_PROBE
+NUD_FAILED
+NUD_NOARP
+NUD_PERMANENT
+NUD_NONE
--
2.7.4
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