netlink: add a basic rtnetlink parser of rule messages

* defs.h (routing_table_ids): New xlat prototype.
* rtnl_rule.c: New file.
* Makefile.am (strace_SOURCES): Add it.
* defs.h (ip_type_of_services, routing_table_ids): New xlat prototypes.
* netlink_route.h (decode_fib_rule_hdr): New prototype.
* configure.ac (AC_CHECK_HEADERS): Add linux/fib_rules.h.
* netlink_route.c (route_decoders): Add RTM_DELRULE, RTM_GETRULE,
and RTM_NEWRULE.
* xlat/fib_rule_actions.in: New file.
* xlat/fib_rule_flags.in: Likewise.

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

diff --git a/Makefile.am b/Makefile.am
index cea4d94ae519de7489677cfa796eb7d6e4f69264..5d535fac44cf69638c5e060c23a63a978456a81c 100644 (file)
--- a/Makefile.am
+++ b/Makefile.am
@@ -250,6 +250,7 @@ strace_SOURCES =    \
        rtnl_addr.c     \
        rtnl_link.c     \
        rtnl_route.c    \
+       rtnl_rule.c     \
        sched.c         \
        sched_attr.h    \
        scsi.c          \

diff --git a/configure.ac b/configure.ac
index d213a4646a338c6cdcd22665612fbde4020d904b..1be4e81f37083998b60a7166828426495a0c0e85 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -377,6 +377,7 @@ AC_CHECK_HEADERS(m4_normalize([
        linux/dm-ioctl.h
        linux/dqblk_xfs.h
        linux/falloc.h
+       linux/fib_rules.h
        linux/fiemap.h
        linux/genetlink.h
        linux/hiddev.h

diff --git a/defs.h b/defs.h
index 8ce28c4f5be76f3405483f18bf207c0601526562..e6659a57712bc9fad248bacae968735a8dbd3cec 100644 (file)
--- a/defs.h
+++ b/defs.h
@@ -292,6 +292,7 @@ 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 ip_type_of_services[];
 extern const struct xlat msg_flags[];
 extern const struct xlat netlink_protocols[];
 extern const struct xlat nl_route_types[];
@@ -299,6 +300,7 @@ 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 routing_table_ids[];
 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 e32d832b3b5bb3a3ef1f6600f0c06cd5f2186c25..877662631e6bd6d848df7f9846eee3c701dfaa89 100644 (file)
--- a/netlink_route.c
+++ b/netlink_route.c
@@ -65,7 +65,11 @@ static const netlink_route_decoder_t route_decoders[] = {
 
        [RTM_DELROUTE - RTM_BASE] = decode_rtmsg,
        [RTM_GETROUTE - RTM_BASE] = decode_rtmsg,
-       [RTM_NEWROUTE - RTM_BASE] = decode_rtmsg
+       [RTM_NEWROUTE - RTM_BASE] = decode_rtmsg,
+
+       [RTM_DELRULE - RTM_BASE] = decode_fib_rule_hdr,
+       [RTM_GETRULE - RTM_BASE] = decode_fib_rule_hdr,
+       [RTM_NEWRULE - RTM_BASE] = decode_fib_rule_hdr
 };
 
 bool

diff --git a/netlink_route.h b/netlink_route.h
index 02d37899da3c2eeb232e89e3bf5cbe4361592374..0d89bcdfdd0701cad3cd5bf660da6c3399800aa3 100644 (file)
--- a/netlink_route.h
+++ b/netlink_route.h
@@ -39,6 +39,7 @@ route_decode_name(struct tcb *tcp,                    \
                  unsigned int len)                     \
 /* End of DECL_NETLINK_ROUTE_DECODER definition. */
 
+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_rtmsg);

diff --git a/rtnl_rule.c b/rtnl_rule.c
new file mode 100644 (file)
index 0000000..b3e6d52
--- /dev/null
+++ b/rtnl_rule.c
@@ -0,0 +1,78 @@
+/*
+ * 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 "netlink.h"
+#include <linux/rtnetlink.h>
+#ifdef HAVE_LINUX_FIB_RULES_H
+# include <linux/fib_rules.h>
+#endif
+
+#include "xlat/fib_rule_actions.h"
+#include "xlat/fib_rule_flags.h"
+
+DECL_NETLINK_ROUTE_DECODER(decode_fib_rule_hdr)
+{
+       /*
+        * struct rtmsg and struct fib_rule_hdr are essentially
+        * the same structure, use struct rtmsg but treat it as
+        * struct fib_rule_hdr.
+        */
+       struct rtmsg msg = { .rtm_family = family };
+       const size_t offset = sizeof(msg.rtm_family);
+
+       tprints("{family=");
+       printxval(addrfams, msg.rtm_family, "AF_???");
+
+       tprints(", ");
+       if (len >= sizeof(msg)) {
+               if (!umoven_or_printaddr(tcp, addr + offset,
+                                        sizeof(msg) - offset,
+                                        (void *) &msg + offset)) {
+                       tprintf("dst_len=%u, src_len=%u",
+                               msg.rtm_dst_len, msg.rtm_src_len);
+                       tprints(", tos=");
+                       printflags(ip_type_of_services, msg.rtm_tos,
+                                  "IPTOS_TOS_???");
+                       tprints(", table=");
+                       printxval(routing_table_ids, msg.rtm_table, NULL);
+                       tprints(", action=");
+                       printxval(fib_rule_actions, msg.rtm_type, "FR_ACT_???");
+                       tprints(", flags=");
+                       printflags(fib_rule_flags, msg.rtm_flags,
+                                  "FIB_RULE_???");
+               }
+       } else
+               tprints("...");
+       tprints("}");
+}

diff --git a/xlat/fib_rule_actions.in b/xlat/fib_rule_actions.in
new file mode 100644 (file)
index 0000000..55d5912
--- /dev/null
+++ b/xlat/fib_rule_actions.in
@@ -0,0 +1,9 @@
+FR_ACT_UNSPEC          0
+FR_ACT_TO_TBL          1
+FR_ACT_GOTO            2
+FR_ACT_NOP             3
+FR_ACT_RES3            4
+FR_ACT_RES4            5
+FR_ACT_BLACKHOLE       6
+FR_ACT_UNREACHABLE     7
+FR_ACT_PROHIBIT                8

diff --git a/xlat/fib_rule_flags.in b/xlat/fib_rule_flags.in
new file mode 100644 (file)
index 0000000..8f4d42c
--- /dev/null
+++ b/xlat/fib_rule_flags.in
@@ -0,0 +1,6 @@
+FIB_RULE_PERMANENT
+FIB_RULE_INVERT
+FIB_RULE_UNRESOLVED
+FIB_RULE_IIF_DETACHED
+FIB_RULE_OIF_DETACHED
+FIB_RULE_FIND_SADDR