This commit adds the ovs_dump_nla GDB command, which allows
dumping Netlink attributes. Here are some examples:
(gdb) ovs_dump_nla 0x7f10e35d8858 172 ovs_check_pkt_len_attr
(struct nlattr *) 0x7f10e35d8858:[OVS_CHECK_PKT_LEN_ATTR_PKT_...
(struct nlattr *) 0x7f10e35d8860:[OVS_CHECK_PKT_LEN_ATTR_...
(struct nlattr *) 0x7f10e35d88b0:[OVS_CHECK_PKT_LEN_ATTR_...
(gdb) ovs_dump_nla 0x7f10e35d8858 172
(struct nlattr *) 0x7f10e35d8858: {nla_len = 6, nla_type ...
(struct nlattr *) 0x7f10e35d8860: {nla_len = 80, nla_type ...
...len = 80, nla_type = 3}, nl_attr_get() = 0x7f10e35d88b4
(gdb) ovs_dump_nla 0x7f10e35d88b4 80 ovs_action_attr dump
... nla_type = 19}, nl_attr_get() = 0x7f10e35d88b8: 3f 01 00 00
...
Signed-off-by: Eelco Chaudron <echau...@redhat.com>
---
utilities/gdb/ovs_gdb.py | 67 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 67 insertions(+)
diff --git a/utilities/gdb/ovs_gdb.py b/utilities/gdb/ovs_gdb.py
index a8a84dcca..bdabe603d 100644
--- a/utilities/gdb/ovs_gdb.py
+++ b/utilities/gdb/ovs_gdb.py
@@ -28,6 +28,7 @@
# - ovs_dump_dp_provider
# - ovs_dump_netdev
# - ovs_dump_netdev_provider
+# - ovs_dump_nla <struct nlattr *> <len> {dump} {enum type}
# - ovs_dump_ovs_list <struct ovs_list *> {[<structure>] [<member>] {dump}]}
# - ovs_dump_packets <struct dp_packet_batch|dp_packet> [tcpdump options]
# - ovs_dump_cmap <struct cmap *> {[<structure>] [<member>] {dump}]}
@@ -1614,6 +1615,71 @@ class CmdDumpDpConntrackConn(gdb.Command):
short="short" in arg_list[1:])
+#
+# Implements the GDB "ovs_dump_nla" command
+#
+class CmdDumpNla(gdb.Command):
+ """Dump all Netlink attributes.
+ Usage:
+ ovs_dump_nla <struct nlattr *> <len> {dump} {enum type}
+
+ This is an example dumping some actions:
+
+ (gdb) ovs_dump_nla 0x7f10e35d88b4 80 ovs_action_attr
+ (struct nlattr *) 0x7f10e35d88b4:[OVS_ACTION_ATTR_METER] {nla_len = 8, ...
+ (struct nlattr *) 0x7f10e35d88bc:[OVS_ACTION_ATTR_SET] {nla_len = 20, ...
+ (struct nlattr *) 0x7f10e35d88d0:[OVS_ACTION_ATTR_SET] {nla_len = 32, ...
+ (struct nlattr *) 0x7f10e35d88f0:[OVS_ACTION_ATTR_PUSH_VLAN] {nla_len ...
+ (struct nlattr *) 0x7f10e35d88f8:[OVS_ACTION_ATTR_OUTPUT] {nla_len = 8, ...
+ """
+ def __init__(self):
+ super(CmdDumpNla, self).__init__("ovs_dump_nla",
+ gdb.COMMAND_DATA)
+
+ def invoke(self, arg, from_tty):
+ attr_size = gdb.lookup_type("struct nlattr").sizeof
+ arg_list = gdb.string_to_argv(arg)
+ dump = False
+ enum = None
+
+ if len(arg_list) not in (2, 3, 4):
+ print("ERROR: Invalid arguments!\n")
+ print(self.__doc__)
+ return
+
+ if len(arg_list) >= 3:
+ for i in range(2, len(arg_list)):
+ if arg_list[i] == "dump":
+ dump = True
+ else:
+ enum = arg_list[i]
+
+ nla = gdb.parse_and_eval(arg_list[0]).cast(
+ gdb.lookup_type('struct nlattr').pointer())
+
+ length = gdb.parse_and_eval(arg_list[1])
+
+ for attr in ForEachNL(nla, length):
+ if enum is not None:
+ hdr = "[{}] {}, nl_attr_get() = {}". \
+ format(attr['nla_type'].cast(
+ gdb.lookup_type('enum ' + arg_list[2])),
+ attr.dereference(), attr + 1)
+ else:
+ hdr = " {}, nl_attr_get() = {}".format(attr.dereference(),
+ attr + 1)
+
+ if dump:
+ mem = gdb.selected_inferior().read_memory(attr + 1,
+ attr['nla_len']
+ - attr_size)
+ dump = ": " + " ".join('{:02x}'.format(b) for b in bytes(mem))
+ else:
+ dump = ""
+
+ print("(struct nlattr *) {}:{}{}".format(attr, hdr, dump))
+
+
#
# Initialize all GDB commands
#
@@ -1625,6 +1691,7 @@ CmdDumpDpNetdevPorts()
CmdDumpDpProvider()
CmdDumpNetdev()
CmdDumpNetdevProvider()
+CmdDumpNla()
CmdDumpOfpacts()
CmdDumpOvsList()
CmdDumpPackets()
--
2.50.0
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