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| author |  Johannes Berg <johannes.berg@intel.com>
| 2020-10-08 12:45:17 +0200 |
|---|---|---|
| committer |  Jakub Kicinski <kuba@kernel.org>
| 2020-10-09 20:22:32 -0700 |
| commit | 44f3625bc61653ea3bde9960298faf2f5518fda5 (patch) | |
| tree | e36d5d8e5795a8992618cc2f756c5bc38d977434 /include/uapi/linux | |
| parent | netlink: policy: refactor per-attr policy writing (diff) | |
| download | linux-44f3625bc61653ea3bde9960298faf2f5518fda5.tar.gz linux-44f3625bc61653ea3bde9960298faf2f5518fda5.tar.bz2 linux-44f3625bc61653ea3bde9960298faf2f5518fda5.zip | |
netlink: export policy in extended ACK
Add a new attribute NLMSGERR_ATTR_POLICY to the extended ACK
to advertise the policy, e.g. if an attribute was out of range,
you'll know the range that's permissible.
Add new NL_SET_ERR_MSG_ATTR_POL() and NL_SET_ERR_MSG_ATTR_POL()
macros to set this, since realistically it's only useful to do
this when the bad attribute (offset) is also returned.
Use it in lib/nlattr.c which practically does all the policy
validation.
v2:
- add and use netlink_policy_dump_attr_size_estimate()
v3:
- remove redundant break
v4:
- really remove redundant break ... sorry
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'include/uapi/linux')
| -rw-r--r-- | include/uapi/linux/netlink.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/uapi/linux/netlink.h b/include/uapi/linux/netlink.h index d02e472ba54c..c3816ff7bfc3 100644 --- a/include/uapi/linux/netlink.h +++ b/include/uapi/linux/netlink.h @@ -129,6 +129,7 @@ struct nlmsgerr { * @NLMSGERR_ATTR_COOKIE: arbitrary subsystem specific cookie to * be used - in the success case - to identify a created * object or operation or similar (binary) + * @NLMSGERR_ATTR_POLICY: policy for a rejected attribute * @__NLMSGERR_ATTR_MAX: number of attributes * @NLMSGERR_ATTR_MAX: highest attribute number */ @@ -137,6 +138,7 @@ enum nlmsgerr_attrs { NLMSGERR_ATTR_MSG, NLMSGERR_ATTR_OFFS, NLMSGERR_ATTR_COOKIE, + NLMSGERR_ATTR_POLICY, __NLMSGERR_ATTR_MAX, NLMSGERR_ATTR_MAX = __NLMSGERR_ATTR_MAX - 1 |