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| author | Phil Sutter <phil@nwl.cc> | 2025-08-07 16:49:59 +0300 |
|---|---|---|
| committer | Florian Westphal <fw@strlen.de> | 2025-09-04 10:19:25 +0300 |
| commit | 4039ce7ef40474d5ba46f414c50cc7020b9cf8ae (patch) | |
| tree | 53b1f7235347160e5d670ab5479f10aa5641932c /include | |
| parent | 661a4f307fe0f80c1d544e09476ccba9037e8e65 (diff) | |
| download | linux-4039ce7ef40474d5ba46f414c50cc7020b9cf8ae.tar.xz | |
netfilter: nf_tables: Introduce NFTA_DEVICE_PREFIX
This new attribute is supposed to be used instead of NFTA_DEVICE_NAME
for simple wildcard interface specs. It holds a NUL-terminated string
representing an interface name prefix to match on.
While kernel code to distinguish full names from prefixes in
NFTA_DEVICE_NAME is simpler than this solution, reusing the existing
attribute with different semantics leads to confusion between different
versions of kernel and user space though:
* With old kernels, wildcards submitted by user space are accepted yet
silently treated as regular names.
* With old user space, wildcards submitted by kernel may cause crashes
since libnftnl expects NUL-termination when there is none.
Using a distinct attribute type sanitizes these situations as the
receiving part detects and rejects the unexpected attribute nested in
*_HOOK_DEVS attributes.
Fixes: 6d07a289504a ("netfilter: nf_tables: Support wildcard netdev hook specs")
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Florian Westphal <fw@strlen.de>
Diffstat (limited to 'include')
| -rw-r--r-- | include/uapi/linux/netfilter/nf_tables.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/uapi/linux/netfilter/nf_tables.h b/include/uapi/linux/netfilter/nf_tables.h index 2beb30be2c5f..8e0eb832bc01 100644 --- a/include/uapi/linux/netfilter/nf_tables.h +++ b/include/uapi/linux/netfilter/nf_tables.h @@ -1784,10 +1784,12 @@ enum nft_synproxy_attributes { * enum nft_device_attributes - nf_tables device netlink attributes * * @NFTA_DEVICE_NAME: name of this device (NLA_STRING) + * @NFTA_DEVICE_PREFIX: device name prefix, a simple wildcard (NLA_STRING) */ enum nft_devices_attributes { NFTA_DEVICE_UNSPEC, NFTA_DEVICE_NAME, + NFTA_DEVICE_PREFIX, __NFTA_DEVICE_MAX }; #define NFTA_DEVICE_MAX (__NFTA_DEVICE_MAX - 1) |