@@ -1717,6 +1717,19 @@ nf_tables_delrule_one(struct nft_ctx *ctx, struct nft_rule *rule)
return -ENOENT;
}
+static int nf_table_delrule_by_chain(struct nft_ctx *ctx)
+{
+ struct nft_rule *rule;
+ int err;
+
+ list_for_each_entry(rule, &ctx->chain->rules, list) {
+ err = nf_tables_delrule_one(ctx, rule);
+ if (err < 0)
+ return err;
+ }
+ return 0;
+}
+
static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb,
const struct nlmsghdr *nlh,
const struct nlattr * const nla[])
@@ -1725,8 +1738,8 @@ static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb,
const struct nft_af_info *afi;
struct net *net = sock_net(skb->sk);
const struct nft_table *table;
- struct nft_chain *chain;
- struct nft_rule *rule, *tmp;
+ struct nft_chain *chain = NULL;
+ struct nft_rule *rule;
int family = nfmsg->nfgen_family, err = 0;
struct nft_ctx ctx;
@@ -1738,22 +1751,29 @@ static int nf_tables_delrule(struct sock *nlsk, struct sk_buff *skb,
if (IS_ERR(table))
return PTR_ERR(table);
- chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
- if (IS_ERR(chain))
- return PTR_ERR(chain);
+ if (nla[NFTA_RULE_CHAIN]) {
+ chain = nf_tables_chain_lookup(table, nla[NFTA_RULE_CHAIN]);
+ if (IS_ERR(chain))
+ return PTR_ERR(chain);
+ }
nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
- if (nla[NFTA_RULE_HANDLE]) {
- rule = nf_tables_rule_lookup(chain, nla[NFTA_RULE_HANDLE]);
- if (IS_ERR(rule))
- return PTR_ERR(rule);
+ if (chain) {
+ if (nla[NFTA_RULE_HANDLE]) {
+ rule = nf_tables_rule_lookup(chain,
+ nla[NFTA_RULE_HANDLE]);
+ if (IS_ERR(rule))
+ return PTR_ERR(rule);
- err = nf_tables_delrule_one(&ctx, rule);
- } else {
- /* Remove all rules in this chain */
- list_for_each_entry_safe(rule, tmp, &chain->rules, list) {
err = nf_tables_delrule_one(&ctx, rule);
+ } else {
+ err = nf_table_delrule_by_chain(&ctx);
+ }
+ } else {
+ list_for_each_entry(chain, &table->chains, list) {
+ ctx.chain = chain;
+ err = nf_table_delrule_by_chain(&ctx);
if (err < 0)
break;
}
This patch allows you to atomically remove all rules stored in a table via the NFT_MSG_DELRULE command. You only need to indicate the specific table and no chain to flush all rules stored in that table. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> --- net/netfilter/nf_tables_api.c | 46 +++++++++++++++++++++++++++++------------ 1 file changed, 33 insertions(+), 13 deletions(-)