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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/net | |
| parent | d2681e93b0ab7afe01d07f8c96f14afaccdcea4c (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/net')
| -rw-r--r-- | include/net/netlink.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/net/netlink.h b/include/net/netlink.h index 2b9e41075f19..7356f41d23ba 100644 --- a/include/net/netlink.h +++ b/include/net/netlink.h @@ -1957,6 +1957,10 @@ int netlink_policy_dump_get_policy_idx(struct netlink_policy_dump_state *state, bool netlink_policy_dump_loop(struct netlink_policy_dump_state *state); int netlink_policy_dump_write(struct sk_buff *skb, struct netlink_policy_dump_state *state); +int netlink_policy_dump_attr_size_estimate(const struct nla_policy *pt); +int netlink_policy_dump_write_attr(struct sk_buff *skb, + const struct nla_policy *pt, + int nestattr); void netlink_policy_dump_free(struct netlink_policy_dump_state *state); #endif |