@@ -4183,12 +4183,18 @@ static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
return -1;
}
+struct nft_obj_filter {
+ char table[NFT_OBJ_MAXNAMELEN];
+ u32 type;
+};
+
static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
{
const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
const struct nft_af_info *afi;
const struct nft_table *table;
unsigned int idx = 0, s_idx = cb->args[0];
+ struct nft_obj_filter *filter = cb->data;
struct net *net = sock_net(skb->sk);
int family = nfmsg->nfgen_family;
struct nft_object *obj;
@@ -4213,6 +4219,13 @@ static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
if (idx > s_idx)
memset(&cb->args[1], 0,
sizeof(cb->args) - sizeof(cb->args[0]));
+ if (filter->table[0] &&
+ strcmp(filter->table, table->name))
+ goto cont;
+ if (filter->type != NFT_OBJECT_UNSPEC &&
+ obj->type->type != filter->type)
+ goto cont;
+
if (nf_tables_fill_obj_info(skb, net, NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
NFT_MSG_NEWOBJ,
@@ -4233,6 +4246,31 @@ static int nf_tables_dump_obj(struct sk_buff *skb, struct netlink_callback *cb)
return skb->len;
}
+static int nf_tables_dump_obj_done(struct netlink_callback *cb)
+{
+ kfree(cb->data);
+
+ return 0;
+}
+
+static struct nft_obj_filter *
+nft_obj_filter_alloc(const struct nlattr * const nla[])
+{
+ struct nft_obj_filter *filter;
+
+ filter = kzalloc(sizeof(*filter), GFP_KERNEL);
+ if (!filter)
+ return ERR_PTR(-ENOMEM);
+
+ if (nla[NFTA_OBJ_TABLE])
+ nla_strlcpy(filter->table, nla[NFTA_OBJ_TABLE],
+ NFT_TABLE_MAXNAMELEN);
+ if (nla[NFTA_OBJ_TYPE])
+ filter->type = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
+
+ return filter;
+}
+
static int nf_tables_getobj(struct net *net, struct sock *nlsk,
struct sk_buff *skb, const struct nlmsghdr *nlh,
const struct nlattr * const nla[])
@@ -4251,7 +4289,19 @@ static int nf_tables_getobj(struct net *net, struct sock *nlsk,
if (nlh->nlmsg_flags & NLM_F_DUMP) {
struct netlink_dump_control c = {
.dump = nf_tables_dump_obj,
+ .done = nf_tables_dump_obj_done,
};
+
+ if (nla[NFTA_OBJ_TABLE] ||
+ nla[NFTA_OBJ_TYPE]) {
+ struct nft_obj_filter *filter;
+
+ filter = nft_obj_filter_alloc(nla);
+ if (IS_ERR(filter))
+ return -ENOMEM;
+
+ c.data = filter;
+ }
return netlink_dump_start(nlsk, skb, nlh, &c);
}
This patch adds the netlink code to filter out dump of stateful objects, through the NFTA_OBJ_TYPE netlink attribute. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> --- net/netfilter/nf_tables_api.c | 50 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+)