netdev - [PATCH net-next v2 1/6] tools: ynl: Fix genlmsg header encoding formats

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Date:   Sun, 19 Mar 2023 19:37:58 +0000
From:   Donald Hunter <donald.hunter@...il.com>
To:     netdev@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     donald.hunter@...hat.com, Donald Hunter <donald.hunter@...il.com>
Subject: [PATCH net-next v2 1/6] tools: ynl: Fix genlmsg header encoding formats

The pack strings use 'b' signed char for cmd and version but struct
genlmsghdr defines them as unsigned char. Use 'B' instead.

Fixes: 4e4480e89c47 ("tools: ynl: move the cli and netlink code around")
Signed-off-by: Donald Hunter <donald.hunter@...il.com>
---
 tools/net/ynl/lib/ynl.py | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/net/ynl/lib/ynl.py b/tools/net/ynl/lib/ynl.py
index 90764a83c646..32536e1f9064 100644
--- a/tools/net/ynl/lib/ynl.py
+++ b/tools/net/ynl/lib/ynl.py
@@ -200,7 +200,7 @@ def _genl_msg(nl_type, nl_flags, genl_cmd, genl_version, seq=None):
     if seq is None:
         seq = random.randint(1, 1024)
     nlmsg = struct.pack("HHII", nl_type, nl_flags, seq, 0)
-    genlmsg = struct.pack("bbH", genl_cmd, genl_version, 0)
+    genlmsg = struct.pack("BBH", genl_cmd, genl_version, 0)
     return nlmsg + genlmsg
 
 
@@ -264,7 +264,7 @@ class GenlMsg:
         self.hdr = nl_msg.raw[0:4]
         self.raw = nl_msg.raw[4:]
 
-        self.genl_cmd, self.genl_version, _ = struct.unpack("bbH", self.hdr)
+        self.genl_cmd, self.genl_version, _ = struct.unpack("BBH", self.hdr)
 
         self.raw_attrs = NlAttrs(self.raw)
 
@@ -358,7 +358,7 @@ class YnlFamily(SpecFamily):
                 raw >>= 1
                 i += 1
         else:
-            value = enum['entries'][raw - i]
+            value = enum.entries_by_val[raw - i].name
         rsp[attr_spec['name']] = value
 
     def _decode(self, attrs, space):
-- 
2.39.0