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netfilter: nf_tables: restrict tunnel object to NFPROTO_NETDEV

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Bail out on using the tunnel dst template from other than netdev family.
Add the infrastructure to check for the family in objects.

Fixes: af308b94a2 ("netfilter: nf_tables: add tunnel support")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2024-01-23 23:45:32 +01:00
parent fb366fc754
commit 776d451648
3 changed files with 12 additions and 5 deletions
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2
include/net/netfilter/nf_tables.h
View file

@ -1351,6 +1351,7 @@ void nft_obj_notify(struct net *net, const struct nft_table *table,
* @type: stateful object numeric type
* @owner: module owner
* @maxattr: maximum netlink attribute
* @family: address family for AF-specific object types
* @policy: netlink attribute policy
*/
struct nft_object_type {
@ -1360,6 +1361,7 @@ struct nft_object_type {
struct list_head list;
u32 type;
unsigned int maxattr;
u8 family;
struct module *owner;
const struct nla_policy *policy;
};

14
net/netfilter/nf_tables_api.c
View file

@ -7551,11 +7551,15 @@ static int nft_object_dump(struct sk_buff *skb, unsigned int attr,
return -1;
}
static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
static const struct nft_object_type *__nft_obj_type_get(u32 objtype, u8 family)
{
const struct nft_object_type *type;
list_for_each_entry(type, &nf_tables_objects, list) {
if (type->family != NFPROTO_UNSPEC &&
type->family != family)
continue;
if (objtype == type->type)
return type;
}
@ -7563,11 +7567,11 @@ static const struct nft_object_type *__nft_obj_type_get(u32 objtype)
}
static const struct nft_object_type *
nft_obj_type_get(struct net *net, u32 objtype)
nft_obj_type_get(struct net *net, u32 objtype, u8 family)
{
const struct nft_object_type *type;
type = __nft_obj_type_get(objtype);
type = __nft_obj_type_get(objtype, family);
if (type != NULL && try_module_get(type->owner))
return type;
@ -7660,7 +7664,7 @@ static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
if (info->nlh->nlmsg_flags & NLM_F_REPLACE)
return -EOPNOTSUPP;
type = __nft_obj_type_get(objtype);
type = __nft_obj_type_get(objtype, family);
if (WARN_ON_ONCE(!type))
return -ENOENT;
@ -7674,7 +7678,7 @@ static int nf_tables_newobj(struct sk_buff *skb, const struct nfnl_info *info,
if (!nft_use_inc(&table->use))
return -EMFILE;
type = nft_obj_type_get(net, objtype);
type = nft_obj_type_get(net, objtype, family);
if (IS_ERR(type)) {
err = PTR_ERR(type);
goto err_type;

1
net/netfilter/nft_tunnel.c
View file

@ -713,6 +713,7 @@ static const struct nft_object_ops nft_tunnel_obj_ops = {
static struct nft_object_type nft_tunnel_obj_type __read_mostly = {
.type = NFT_OBJECT_TUNNEL,
.family = NFPROTO_NETDEV,
.ops = &nft_tunnel_obj_ops,
.maxattr = NFTA_TUNNEL_KEY_MAX,
.policy = nft_tunnel_key_policy,