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netfilter: nft_hash: do not dump the auto generated seed

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This can prevent the nft utility from printing out the auto generated
seed to the user, which is unnecessary and confusing.

Fixes: cb1b69b0b1 ("netfilter: nf_tables: add hash expression")
Signed-off-by: Liping Zhang <zlpnobody@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Liping Zhang 2017-04-03 16:34:38 +08:00 committed by Pablo Neira Ayuso
parent 7cddd967bf
commit 79e09ef96b
1 changed files with 7 additions and 3 deletions
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10
net/netfilter/nft_hash.c
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@ -21,6 +21,7 @@ struct nft_hash {
enum nft_registers sreg:8;
enum nft_registers dreg:8;
u8 len;
bool autogen_seed:1;
u32 modulus;
u32 seed;
u32 offset;
@ -82,10 +83,12 @@ static int nft_hash_init(const struct nft_ctx *ctx,
if (priv->offset + priv->modulus - 1 < priv->offset)
return -EOVERFLOW;
if (tb[NFTA_HASH_SEED])
if (tb[NFTA_HASH_SEED]) {
priv->seed = ntohl(nla_get_be32(tb[NFTA_HASH_SEED]));
else
} else {
priv->autogen_seed = true;
get_random_bytes(&priv->seed, sizeof(priv->seed));
}
return nft_validate_register_load(priv->sreg, len) &&
nft_validate_register_store(ctx, priv->dreg, NULL,
@ -105,7 +108,8 @@ static int nft_hash_dump(struct sk_buff *skb,
goto nla_put_failure;
if (nla_put_be32(skb, NFTA_HASH_MODULUS, htonl(priv->modulus)))
goto nla_put_failure;
if (nla_put_be32(skb, NFTA_HASH_SEED, htonl(priv->seed)))
if (!priv->autogen_seed &&
nla_put_be32(skb, NFTA_HASH_SEED, htonl(priv->seed)))
goto nla_put_failure;
if (priv->offset != 0)
if (nla_put_be32(skb, NFTA_HASH_OFFSET, htonl(priv->offset)))