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Date: Sat, 22 Apr 2023 01:02:10 +0200
From: Pablo Neira Ayuso <pablo@...filter.org>
To: netfilter-devel@...r.kernel.org
Cc: davem@...emloft.net, netdev@...r.kernel.org, kuba@...nel.org,
pabeni@...hat.com, edumazet@...gle.com
Subject: [PATCH net-next 19/20] netfilter: nf_tables: support for deleting devices in an existing netdev chain
This patch allows for deleting devices in an existing netdev chain.
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
net/netfilter/nf_tables_api.c | 99 +++++++++++++++++++++++++++++++----
1 file changed, 88 insertions(+), 11 deletions(-)
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index f8d8cace0c7d..c55ac3d57c51 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -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))
@@ -8812,7 +8872,10 @@ static void nft_commit_release(struct nft_trans *trans)
break;
case NFT_MSG_DELCHAIN:
case NFT_MSG_DESTROYCHAIN:
- nf_tables_chain_destroy(&trans->ctx);
+ 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:
case NFT_MSG_DESTROYRULE:
@@ -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:
- nft_chain_del(trans->ctx.chain);
- nf_tables_chain_notify(&trans->ctx, trans->msg_type, NULL);
- nf_tables_unregister_hook(trans->ctx.net,
- trans->ctx.table,
- trans->ctx.chain);
+ 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, 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:
- trans->ctx.table->use++;
- nft_clear(trans->ctx.net, trans->ctx.chain);
+ 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:
--
2.30.2
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