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netfilter: nf_tables: allow to create netdev chain without device

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Relax netdev chain creation to allow for loading the ruleset, then
adding/deleting devices at a later stage. Hardware offload does not
support for this feature yet.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2023-04-21 00:34:33 +02:00
parent 7d937b1071
commit 207296f1a0
1 changed files with 11 additions and 12 deletions
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23
net/netfilter/nf_tables_api.c
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@ -2023,10 +2023,9 @@ struct nft_chain_hook {
struct list_head list;
};
static int nft_chain_parse_netdev(struct net *net,
struct nlattr *tb[],
static int nft_chain_parse_netdev(struct net *net, struct nlattr *tb[],
struct list_head *hook_list,
struct netlink_ext_ack *extack)
struct netlink_ext_ack *extack, u32 flags)
{
struct nft_hook *hook;
int err;
@ -2045,12 +2044,12 @@ static int nft_chain_parse_netdev(struct net *net,
if (err < 0)
return err;
if (list_empty(hook_list))
return -EINVAL;
} else {
return -EINVAL;
}
if (flags & NFT_CHAIN_HW_OFFLOAD &&
list_empty(hook_list))
return -EINVAL;
return 0;
}
@ -2058,7 +2057,7 @@ static int nft_chain_parse_hook(struct net *net,
struct nft_base_chain *basechain,
const struct nlattr * const nla[],
struct nft_chain_hook *hook, u8 family,
struct netlink_ext_ack *extack)
u32 flags, struct netlink_ext_ack *extack)
{
struct nftables_pernet *nft_net = nft_pernet(net);
struct nlattr *ha[NFTA_HOOK_MAX + 1];
@ -2125,7 +2124,7 @@ static int nft_chain_parse_hook(struct net *net,
INIT_LIST_HEAD(&hook->list);
if (nft_base_chain_netdev(family, hook->num)) {
err = nft_chain_parse_netdev(net, ha, &hook->list, extack);
err = nft_chain_parse_netdev(net, ha, &hook->list, extack, flags);
if (err < 0) {
module_put(type->owner);
return err;
@ -2263,7 +2262,7 @@ static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
if (flags & NFT_CHAIN_BINDING)
return -EOPNOTSUPP;
err = nft_chain_parse_hook(net, NULL, nla, &hook, family,
err = nft_chain_parse_hook(net, NULL, nla, &hook, family, flags,
extack);
if (err < 0)
return err;
@ -2407,7 +2406,7 @@ static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
basechain = nft_base_chain(chain);
err = nft_chain_parse_hook(ctx->net, basechain, nla, &hook,
ctx->family, extack);
ctx->family, flags, extack);
if (err < 0)
return err;
@ -2683,7 +2682,7 @@ static int nft_delchain_hook(struct nft_ctx *ctx, struct nft_chain *chain,
basechain = nft_base_chain(chain);
err = nft_chain_parse_hook(ctx->net, basechain, nla, &chain_hook,
ctx->family, extack);
ctx->family, chain->flags, extack);
if (err < 0)
return err;