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authorFlorian Westphal <fw@strlen.de>2022-09-05 12:09:36 +0200
committerDavid S. Miller <davem@davemloft.net>2022-09-07 12:33:43 +0100
commit08724ef69907214ce622344fe4945412e38368f0 (patch)
tree5c18735ab7ac018a60c46c9f6b415ec553ea0a89 /include/net/netlink.h
parent98ba81081b429d147c0230f59a999aa80d0b9d33 (diff)
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/net/netlink.h')
-rw-r--r--include/net/netlink.h9
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) { \