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netfilter: nf_tables: Support RULE_ID reference in new rule

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To allow for a batch to contain rules in arbitrary ordering, introduce
NFTA_RULE_POSITION_ID attribute which works just like NFTA_RULE_POSITION
but contains the ID of another rule within the same batch. This helps
iptables-nft-restore handling dumps with mixed insert/append commands
correctly.

Note that NFTA_RULE_POSITION takes precedence over
NFTA_RULE_POSITION_ID, so if the former is present, the latter is
ignored.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Phil Sutter 2019-01-14 18:41:35 +01:00 committed by Pablo Neira Ayuso
parent 8e2f311a68
commit 75dd48e2e4
2 changed files with 11 additions and 0 deletions
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2
include/uapi/linux/netfilter/nf_tables.h
View file

@ -219,6 +219,7 @@ enum nft_chain_attributes {
* @NFTA_RULE_POSITION: numeric handle of the previous rule (NLA_U64)
* @NFTA_RULE_USERDATA: user data (NLA_BINARY, NFT_USERDATA_MAXLEN)
* @NFTA_RULE_ID: uniquely identifies a rule in a transaction (NLA_U32)
* @NFTA_RULE_POSITION_ID: transaction unique identifier of the previous rule (NLA_U32)
*/
enum nft_rule_attributes {
NFTA_RULE_UNSPEC,
@ -231,6 +232,7 @@ enum nft_rule_attributes {
NFTA_RULE_USERDATA,
NFTA_RULE_PAD,
NFTA_RULE_ID,
NFTA_RULE_POSITION_ID,
__NFTA_RULE_MAX
};
#define NFTA_RULE_MAX (__NFTA_RULE_MAX - 1)

9
net/netfilter/nf_tables_api.c
View file

@ -2610,6 +2610,9 @@ static int nft_table_validate(struct net *net, const struct nft_table *table)
return 0;
}
static struct nft_rule *nft_rule_lookup_byid(const struct net *net,
const struct nlattr *nla);
#define NFT_RULE_MAXEXPRS 128
static int nf_tables_newrule(struct net *net, struct sock *nlsk,
@ -2679,6 +2682,12 @@ static int nf_tables_newrule(struct net *net, struct sock *nlsk,
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION]);
return PTR_ERR(old_rule);
}
} else if (nla[NFTA_RULE_POSITION_ID]) {
old_rule = nft_rule_lookup_byid(net, nla[NFTA_RULE_POSITION_ID]);
if (IS_ERR(old_rule)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_RULE_POSITION_ID]);
return PTR_ERR(old_rule);
}
}
}