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netfilter: nf_tables: support for deleting devices in an existing netdev chain

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This patch allows for deleting devices in an existing netdev chain.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2023-04-21 00:34:32 +02:00
parent b9703ed44f
commit 7d937b1071
1 changed files with 88 additions and 11 deletions
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85
net/netfilter/nf_tables_api.c
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@ -1646,7 +1646,7 @@ static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
NFTA_CHAIN_PAD))
goto nla_put_failure;
if (event == NFT_MSG_DELCHAIN) {
if (event == NFT_MSG_DELCHAIN && !hook_list) {
nlmsg_end(skb, nlh);
return 0;
}
@ -2667,6 +2667,59 @@ static int nf_tables_newchain(struct sk_buff *skb, const struct nfnl_info *info,
return nf_tables_addchain(&ctx, family, genmask, policy, flags, extack);
}
static int nft_delchain_hook(struct nft_ctx *ctx, struct nft_chain *chain,
struct netlink_ext_ack *extack)
{
const struct nlattr * const *nla = ctx->nla;
struct nft_chain_hook chain_hook = {};
struct nft_base_chain *basechain;
struct nft_hook *this, *hook;
LIST_HEAD(chain_del_list);
struct nft_trans *trans;
int err;
if (!nft_is_base_chain(chain))
return -EOPNOTSUPP;
basechain = nft_base_chain(chain);
err = nft_chain_parse_hook(ctx->net, basechain, nla, &chain_hook,
ctx->family, extack);
if (err < 0)
return err;
list_for_each_entry(this, &chain_hook.list, list) {
hook = nft_hook_list_find(&basechain->hook_list, this);
if (!hook) {
err = -ENOENT;
goto err_chain_del_hook;
}
list_move(&hook->list, &chain_del_list);
}
trans = nft_trans_alloc(ctx, NFT_MSG_DELCHAIN,
sizeof(struct nft_trans_chain));
if (!trans) {
err = -ENOMEM;
goto err_chain_del_hook;
}
nft_trans_basechain(trans) = basechain;
nft_trans_chain_update(trans) = true;
INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
list_splice(&chain_del_list, &nft_trans_chain_hooks(trans));
nft_chain_release_hook(&chain_hook);
nft_trans_commit_list_add_tail(ctx->net, trans);
return 0;
err_chain_del_hook:
list_splice(&chain_del_list, &basechain->hook_list);
nft_chain_release_hook(&chain_hook);
return err;
}
static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const nla[])
{
@ -2707,12 +2760,19 @@ static int nf_tables_delchain(struct sk_buff *skb, const struct nfnl_info *info,
return PTR_ERR(chain);
}
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
if (nla[NFTA_CHAIN_HOOK]) {
if (chain->flags & NFT_CHAIN_HW_OFFLOAD)
return -EOPNOTSUPP;
return nft_delchain_hook(&ctx, chain, extack);
}
if (info->nlh->nlmsg_flags & NLM_F_NONREC &&
chain->use > 0)
return -EBUSY;
nft_ctx_init(&ctx, net, skb, info->nlh, family, table, chain, nla);
use = chain->use;
list_for_each_entry(rule, &chain->rules, list) {
if (!nft_is_active_next(net, rule))
@ -8812,6 +8872,9 @@ static void nft_commit_release(struct nft_trans *trans)
break;
case NFT_MSG_DELCHAIN:
case NFT_MSG_DESTROYCHAIN:
if (nft_trans_chain_update(trans))
nft_hooks_destroy(&nft_trans_chain_hooks(trans));
else
nf_tables_chain_destroy(&trans->ctx);
break;
case NFT_MSG_DELRULE:
@ -9304,11 +9367,20 @@ static int nf_tables_commit(struct net *net, struct sk_buff *skb)
break;
case NFT_MSG_DELCHAIN:
case NFT_MSG_DESTROYCHAIN:
if (nft_trans_chain_update(trans)) {
nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
&nft_trans_chain_hooks(trans));
nft_netdev_unregister_hooks(net,
&nft_trans_chain_hooks(trans),
true);
} else {
nft_chain_del(trans->ctx.chain);
nf_tables_chain_notify(&trans->ctx, trans->msg_type, NULL);
nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN,
NULL);
nf_tables_unregister_hook(trans->ctx.net,
trans->ctx.table,
trans->ctx.chain);
}
break;
case NFT_MSG_NEWRULE:
nft_clear(trans->ctx.net, nft_trans_rule(trans));
@ -9558,8 +9630,13 @@ static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
break;
case NFT_MSG_DELCHAIN:
case NFT_MSG_DESTROYCHAIN:
if (nft_trans_chain_update(trans)) {
list_splice(&nft_trans_chain_hooks(trans),
&nft_trans_basechain(trans)->hook_list);
} else {
trans->ctx.table->use++;
nft_clear(trans->ctx.net, trans->ctx.chain);
}
nft_trans_destroy(trans);
break;
case NFT_MSG_NEWRULE: