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netfilter: nf_tables: allow to filter out rules by table and chain 

If the table and/or chain attributes are set in a rule dump request,
we filter out the rules based on this selection.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2016-07-19 12:20:45 +02:00
parent cc37c1ad42
commit 6e1f760e13
1 changed files with 38 additions and 0 deletions
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38
net/netfilter/nf_tables_api.c
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@ -1857,10 +1857,16 @@ err:
return err;
}
struct nft_rule_dump_ctx {
char table[NFT_TABLE_MAXNAMELEN];
char chain[NFT_CHAIN_MAXNAMELEN];
};
static int nf_tables_dump_rules(struct sk_buff *skb,
struct netlink_callback *cb)
{
const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
const struct nft_rule_dump_ctx *ctx = cb->data;
const struct nft_af_info *afi;
const struct nft_table *table;
const struct nft_chain *chain;
@ -1877,7 +1883,15 @@ static int nf_tables_dump_rules(struct sk_buff *skb,
continue;
list_for_each_entry_rcu(table, &afi->tables, list) {
if (ctx && ctx->table[0] &&
strcmp(ctx->table, table->name) != 0)
continue;
list_for_each_entry_rcu(chain, &table->chains, list) {
if (ctx && ctx->chain[0] &&
strcmp(ctx->chain, chain->name) != 0)
continue;
list_for_each_entry_rcu(rule, &chain->rules, list) {
if (!nft_is_active(net, rule))
goto cont;
@ -1907,6 +1921,12 @@ done:
return skb->len;
}
static int nf_tables_dump_rules_done(struct netlink_callback *cb)
{
kfree(cb->data);
return 0;
}
static int nf_tables_getrule(struct net *net, struct sock *nlsk,
struct sk_buff *skb, const struct nlmsghdr *nlh,
const struct nlattr * const nla[])
@ -1924,7 +1944,25 @@ static int nf_tables_getrule(struct net *net, struct sock *nlsk,
if (nlh->nlmsg_flags & NLM_F_DUMP) {
struct netlink_dump_control c = {
.dump = nf_tables_dump_rules,
.done = nf_tables_dump_rules_done,
};
if (nla[NFTA_RULE_TABLE] || nla[NFTA_RULE_CHAIN]) {
struct nft_rule_dump_ctx *ctx;
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
if (nla[NFTA_RULE_TABLE])
nla_strlcpy(ctx->table, nla[NFTA_RULE_TABLE],
sizeof(ctx->table));
if (nla[NFTA_RULE_CHAIN])
nla_strlcpy(ctx->chain, nla[NFTA_RULE_CHAIN],
sizeof(ctx->chain));
c.data = ctx;
}
return netlink_dump_start(nlsk, skb, nlh, &c);
}