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Message-Id: <20200529175026.30541-8-pablo@netfilter.org>
Date: Fri, 29 May 2020 19:50:24 +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
Subject: [PATCH 7/9] netfilter: nf_tables: delete devices from flowtable
This patch allows users to delete devices from existing flowtables.
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
include/net/netfilter/nf_tables.h | 1 +
net/netfilter/nf_tables_api.c | 113 +++++++++++++++++++++++++-----
2 files changed, 98 insertions(+), 16 deletions(-)
diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h
index 4f58c4411bb4..6f0f6fca9ac3 100644
--- a/include/net/netfilter/nf_tables.h
+++ b/include/net/netfilter/nf_tables.h
@@ -1002,6 +1002,7 @@ struct nft_stats {
struct nft_hook {
struct list_head list;
+ bool inactive;
struct nf_hook_ops ops;
struct rcu_head rcu;
};
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 98f2cbb97e39..1c2c3bb78fa0 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -1669,6 +1669,7 @@ static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
goto err_hook_dev;
}
hook->ops.dev = dev;
+ hook->inactive = false;
return hook;
@@ -1678,17 +1679,17 @@ static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
return ERR_PTR(err);
}
-static bool nft_hook_list_find(struct list_head *hook_list,
- const struct nft_hook *this)
+static struct nft_hook *nft_hook_list_find(struct list_head *hook_list,
+ const struct nft_hook *this)
{
struct nft_hook *hook;
list_for_each_entry(hook, hook_list, list) {
if (this->ops.dev == hook->ops.dev)
- return true;
+ return hook;
}
- return false;
+ return NULL;
}
static int nf_tables_parse_netdev_hooks(struct net *net,
@@ -6530,6 +6531,51 @@ static int nf_tables_newflowtable(struct net *net, struct sock *nlsk,
return err;
}
+static int nft_delflowtable_hook(struct nft_ctx *ctx,
+ struct nft_flowtable *flowtable)
+{
+ const struct nlattr * const *nla = ctx->nla;
+ struct nft_flowtable_hook flowtable_hook;
+ struct nft_hook *this, *next, *hook;
+ struct nft_trans *trans;
+ int err;
+
+ err = nft_flowtable_parse_hook(ctx, nla[NFTA_FLOWTABLE_HOOK],
+ &flowtable_hook, &flowtable->data);
+ if (err < 0)
+ return err;
+
+ list_for_each_entry_safe(this, next, &flowtable_hook.list, list) {
+ hook = nft_hook_list_find(&flowtable->hook_list, this);
+ if (!hook) {
+ err = -ENOENT;
+ goto err_flowtable_del_hook;
+ }
+ hook->inactive = true;
+ list_del(&this->list);
+ kfree(this);
+ }
+
+ trans = nft_trans_alloc(ctx, NFT_MSG_DELFLOWTABLE,
+ sizeof(struct nft_trans_flowtable));
+ if (!trans)
+ return -ENOMEM;
+
+ nft_trans_flowtable(trans) = flowtable;
+ nft_trans_flowtable_update(trans) = true;
+ INIT_LIST_HEAD(&nft_trans_flowtable_hooks(trans));
+
+ list_add_tail(&trans->list, &ctx->net->nft.commit_list);
+
+ return 0;
+
+err_flowtable_del_hook:
+ list_for_each_entry(hook, &flowtable_hook.list, list)
+ hook->inactive = false;
+
+ return err;
+}
+
static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
struct sk_buff *skb,
const struct nlmsghdr *nlh,
@@ -6568,13 +6614,17 @@ static int nf_tables_delflowtable(struct net *net, struct sock *nlsk,
NL_SET_BAD_ATTR(extack, attr);
return PTR_ERR(flowtable);
}
+
+ nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
+
+ if (nla[NFTA_FLOWTABLE_HOOK])
+ return nft_delflowtable_hook(&ctx, flowtable);
+
if (flowtable->use > 0) {
NL_SET_BAD_ATTR(extack, attr);
return -EBUSY;
}
- nft_ctx_init(&ctx, net, skb, nlh, family, table, NULL, nla);
-
return nft_delflowtable(&ctx, flowtable);
}
@@ -7184,7 +7234,10 @@ static void nft_commit_release(struct nft_trans *trans)
nft_obj_destroy(&trans->ctx, nft_trans_obj(trans));
break;
case NFT_MSG_DELFLOWTABLE:
- nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
+ if (nft_trans_flowtable_update(trans))
+ nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
+ else
+ nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
break;
}
@@ -7345,6 +7398,17 @@ static void nft_chain_del(struct nft_chain *chain)
list_del_rcu(&chain->list);
}
+static void nft_flowtable_hooks_del(struct nft_flowtable *flowtable,
+ struct list_head *hook_list)
+{
+ struct nft_hook *hook, *next;
+
+ list_for_each_entry_safe(hook, next, &flowtable->hook_list, list) {
+ if (hook->inactive)
+ list_move(&hook->list, hook_list);
+ }
+}
+
static void nf_tables_module_autoload_cleanup(struct net *net)
{
struct nft_module_request *req, *next;
@@ -7570,13 +7634,24 @@ static int nf_tables_commit(struct net *net, struct sk_buff *skb)
nft_trans_destroy(trans);
break;
case NFT_MSG_DELFLOWTABLE:
- list_del_rcu(&nft_trans_flowtable(trans)->list);
- nf_tables_flowtable_notify(&trans->ctx,
- nft_trans_flowtable(trans),
- &nft_trans_flowtable(trans)->hook_list,
- NFT_MSG_DELFLOWTABLE);
- nft_unregister_flowtable_net_hooks(net,
- &nft_trans_flowtable(trans)->hook_list);
+ if (nft_trans_flowtable_update(trans)) {
+ nft_flowtable_hooks_del(nft_trans_flowtable(trans),
+ &nft_trans_flowtable_hooks(trans));
+ nf_tables_flowtable_notify(&trans->ctx,
+ nft_trans_flowtable(trans),
+ &nft_trans_flowtable_hooks(trans),
+ NFT_MSG_DELFLOWTABLE);
+ nft_unregister_flowtable_net_hooks(net,
+ &nft_trans_flowtable_hooks(trans));
+ } else {
+ list_del_rcu(&nft_trans_flowtable(trans)->list);
+ nf_tables_flowtable_notify(&trans->ctx,
+ nft_trans_flowtable(trans),
+ &nft_trans_flowtable(trans)->hook_list,
+ NFT_MSG_DELFLOWTABLE);
+ nft_unregister_flowtable_net_hooks(net,
+ &nft_trans_flowtable(trans)->hook_list);
+ }
break;
}
}
@@ -7638,6 +7713,7 @@ static int __nf_tables_abort(struct net *net, bool autoload)
{
struct nft_trans *trans, *next;
struct nft_trans_elem *te;
+ struct nft_hook *hook;
list_for_each_entry_safe_reverse(trans, next, &net->nft.commit_list,
list) {
@@ -7746,8 +7822,13 @@ static int __nf_tables_abort(struct net *net, bool autoload)
}
break;
case NFT_MSG_DELFLOWTABLE:
- trans->ctx.table->use++;
- nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
+ if (nft_trans_flowtable_update(trans)) {
+ list_for_each_entry(hook, &nft_trans_flowtable(trans)->hook_list, list)
+ hook->inactive = false;
+ } else {
+ trans->ctx.table->use++;
+ nft_clear(trans->ctx.net, nft_trans_flowtable(trans));
+ }
nft_trans_destroy(trans);
break;
}
--
2.20.1
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