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utilities:gdb: Add GDB function to dump Netlink attributes.

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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
...

Acked-by: Mike Pattrick <mkp@redhat.com>
Signed-off-by: Eelco Chaudron <echaudro@redhat.com>
This commit is contained in:
Eelco Chaudron 2025-07-10 15:27:22 +02:00
parent 6d4044899e
commit 50e1e57f81
1 changed files with 67 additions and 0 deletions
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67
utilities/gdb/ovs_gdb.py
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@ -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()