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| author | Florian Westphal <fw@strlen.de> | 2022-09-05 12:09:36 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2022-09-07 12:33:43 +0100 |
| commit | 08724ef69907214ce622344fe4945412e38368f0 (patch) | |
| tree | 5c18735ab7ac018a60c46c9f6b415ec553ea0a89 /include | |
| parent | 98ba81081b429d147c0230f59a999aa80d0b9d33 (diff) | |
| download | lwn-08724ef69907214ce622344fe4945412e38368f0.tar.gz lwn-08724ef69907214ce622344fe4945412e38368f0.zip | |
netlink: introduce NLA_POLICY_MAX_BE
netlink allows to specify allowed ranges for integer types.
Unfortunately, nfnetlink passes integers in big endian, so the existing
NLA_POLICY_MAX() cannot be used.
At the moment, nfnetlink users, such as nf_tables, need to resort to
programmatic checking via helpers such as nft_parse_u32_check().
This is both cumbersome and error prone. This adds NLA_POLICY_MAX_BE
which adds range check support for BE16, BE32 and BE64 integers.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/net/netlink.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/net/netlink.h b/include/net/netlink.h index e658d18afa67..4418b1981e31 100644 --- a/include/net/netlink.h +++ b/include/net/netlink.h @@ -325,6 +325,7 @@ struct nla_policy { struct netlink_range_validation_signed *range_signed; struct { s16 min, max; + u8 network_byte_order:1; }; int (*validate)(const struct nlattr *attr, struct netlink_ext_ack *extack); @@ -418,6 +419,14 @@ struct nla_policy { .type = NLA_ENSURE_INT_OR_BINARY_TYPE(tp), \ .validation_type = NLA_VALIDATE_MAX, \ .max = _max, \ + .network_byte_order = 0, \ +} + +#define NLA_POLICY_MAX_BE(tp, _max) { \ + .type = NLA_ENSURE_UINT_TYPE(tp), \ + .validation_type = NLA_VALIDATE_MAX, \ + .max = _max, \ + .network_byte_order = 1, \ } #define NLA_POLICY_MASK(tp, _mask) { \ |