[PATCH nf-next,v2 1/4] netfilter: nf_tables: rename function to destroy hook list

[PATCH nf-next,v2 1/4] netfilter: nf_tables: rename function to destroy hook list

[Pablo Neira Ayuso]

Rename nft_flowtable_hooks_destroy() by nft_hooks_destroy() to prepare
for netdev chain device updates.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
v2: no changes.

 net/netfilter/nf_tables_api.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 1e372973f0d5..3f61d2ac32ec 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -7608,7 +7608,7 @@ static int nft_register_flowtable_net_hooks(struct net *net,
 	return err;
 }
 
-static void nft_flowtable_hooks_destroy(struct list_head *hook_list)
+static void nft_hooks_destroy(struct list_head *hook_list)
 {
 	struct nft_hook *hook, *next;
 
@@ -7788,7 +7788,7 @@ static int nf_tables_newflowtable(struct sk_buff *skb,
 					       &flowtable->hook_list,
 					       flowtable);
 	if (err < 0) {
-		nft_flowtable_hooks_destroy(&flowtable->hook_list);
+		nft_hooks_destroy(&flowtable->hook_list);
 		goto err4;
 	}
 
@@ -8568,7 +8568,7 @@ static void nft_commit_release(struct nft_trans *trans)
 		break;
 	case NFT_MSG_DELFLOWTABLE:
 		if (nft_trans_flowtable_update(trans))
-			nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
+			nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
 		else
 			nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
 		break;
@@ -9208,7 +9208,7 @@ static void nf_tables_abort_release(struct nft_trans *trans)
 		break;
 	case NFT_MSG_NEWFLOWTABLE:
 		if (nft_trans_flowtable_update(trans))
-			nft_flowtable_hooks_destroy(&nft_trans_flowtable_hooks(trans));
+			nft_hooks_destroy(&nft_trans_flowtable_hooks(trans));
 		else
 			nf_tables_flowtable_destroy(nft_trans_flowtable(trans));
 		break;
-- 
2.30.2

[PATCH nf-next,v2 2/4] netfilter: nf_tables: support for adding new devices to an existing netdev chain

[Pablo Neira Ayuso]

This patch allows users to add devices to an existing netdev chain.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
v2: - notify device updates.
    - fix error path in nf_tables_updchain()
    - initialize nft_chain_hook object to fix spurious hooknum / priority mismatch.

 include/net/netfilter/nf_tables.h |   6 ++
 net/netfilter/nf_tables_api.c     | 169 +++++++++++++++++++-----------
 2 files changed, 113 insertions(+), 62 deletions(-)

diff --git a/include/net/netfilter/nf_tables.h b/include/net/netfilter/nf_tables.h
index e69ce23566ea..a2b1cb8e3985 100644
--- a/include/net/netfilter/nf_tables.h
+++ b/include/net/netfilter/nf_tables.h
@@ -1574,6 +1574,8 @@ struct nft_trans_chain {
 	struct nft_stats __percpu	*stats;
 	u8				policy;
 	u32				chain_id;
+	struct nft_base_chain		*basechain;
+	struct list_head		hook_list;
 };
 
 #define nft_trans_chain_update(trans)	\
@@ -1586,6 +1588,10 @@ struct nft_trans_chain {
 	(((struct nft_trans_chain *)trans->data)->policy)
 #define nft_trans_chain_id(trans)	\
 	(((struct nft_trans_chain *)trans->data)->chain_id)
+#define nft_trans_basechain(trans)	\
+	(((struct nft_trans_chain *)trans->data)->basechain)
+#define nft_trans_chain_hooks(trans)	\
+	(((struct nft_trans_chain *)trans->data)->hook_list)
 
 struct nft_trans_table {
 	bool				update;
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 3f61d2ac32ec..4591104ce5f3 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -1567,7 +1567,8 @@ static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
 }
 
 static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
-				   const struct nft_base_chain *basechain)
+				   const struct nft_base_chain *basechain,
+				   const struct list_head *hook_list)
 {
 	const struct nf_hook_ops *ops = &basechain->ops;
 	struct nft_hook *hook, *first = NULL;
@@ -1584,7 +1585,11 @@ static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
 
 	if (nft_base_chain_netdev(family, ops->hooknum)) {
 		nest_devs = nla_nest_start_noflag(skb, NFTA_HOOK_DEVS);
-		list_for_each_entry(hook, &basechain->hook_list, list) {
+
+		if (!hook_list)
+			hook_list = &basechain->hook_list;
+
+		list_for_each_entry(hook, hook_list, list) {
 			if (!first)
 				first = hook;
 
@@ -1609,7 +1614,8 @@ static int nft_dump_basechain_hook(struct sk_buff *skb, int family,
 static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
 				     u32 portid, u32 seq, int event, u32 flags,
 				     int family, const struct nft_table *table,
-				     const struct nft_chain *chain)
+				     const struct nft_chain *chain,
+				     const struct list_head *hook_list)
 {
 	struct nlmsghdr *nlh;
 
@@ -1634,7 +1640,7 @@ static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
 		const struct nft_base_chain *basechain = nft_base_chain(chain);
 		struct nft_stats __percpu *stats;
 
-		if (nft_dump_basechain_hook(skb, family, basechain))
+		if (nft_dump_basechain_hook(skb, family, basechain, hook_list))
 			goto nla_put_failure;
 
 		if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
@@ -1669,7 +1675,8 @@ static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
 	return -1;
 }
 
-static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
+static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event,
+				   const struct list_head *hook_list)
 {
 	struct nftables_pernet *nft_net;
 	struct sk_buff *skb;
@@ -1689,7 +1696,7 @@ static void nf_tables_chain_notify(const struct nft_ctx *ctx, int event)
 
 	err = nf_tables_fill_chain_info(skb, ctx->net, ctx->portid, ctx->seq,
 					event, flags, ctx->family, ctx->table,
-					ctx->chain);
+					ctx->chain, hook_list);
 	if (err < 0) {
 		kfree_skb(skb);
 		goto err;
@@ -1735,7 +1742,7 @@ static int nf_tables_dump_chains(struct sk_buff *skb,
 						      NFT_MSG_NEWCHAIN,
 						      NLM_F_MULTI,
 						      table->family, table,
-						      chain) < 0)
+						      chain, NULL) < 0)
 				goto done;
 
 			nl_dump_check_consistent(cb, nlmsg_hdr(skb));
@@ -1789,7 +1796,7 @@ static int nf_tables_getchain(struct sk_buff *skb, const struct nfnl_info *info,
 
 	err = nf_tables_fill_chain_info(skb2, net, NETLINK_CB(skb).portid,
 					info->nlh->nlmsg_seq, NFT_MSG_NEWCHAIN,
-					0, family, table, chain);
+					0, family, table, chain, NULL);
 	if (err < 0)
 		goto err_fill_chain_info;
 
@@ -2029,7 +2036,7 @@ static int nft_chain_parse_netdev(struct net *net,
 static int nft_chain_parse_hook(struct net *net,
 				const struct nlattr * const nla[],
 				struct nft_chain_hook *hook, u8 family,
-				struct netlink_ext_ack *extack, bool autoload)
+				struct netlink_ext_ack *extack, bool add)
 {
 	struct nftables_pernet *nft_net = nft_pernet(net);
 	struct nlattr *ha[NFTA_HOOK_MAX + 1];
@@ -2045,12 +2052,19 @@ static int nft_chain_parse_hook(struct net *net,
 	if (err < 0)
 		return err;
 
-	if (ha[NFTA_HOOK_HOOKNUM] == NULL ||
-	    ha[NFTA_HOOK_PRIORITY] == NULL)
-		return -EINVAL;
+	if (add) {
+		if (!ha[NFTA_HOOK_HOOKNUM] ||
+		    !ha[NFTA_HOOK_PRIORITY])
+			return -EINVAL;
 
-	hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
-	hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
+		hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
+		hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
+	} else {
+		if (ha[NFTA_HOOK_HOOKNUM])
+			hook->num = ntohl(nla_get_be32(ha[NFTA_HOOK_HOOKNUM]));
+		if (ha[NFTA_HOOK_PRIORITY])
+			hook->priority = ntohl(nla_get_be32(ha[NFTA_HOOK_PRIORITY]));
+	}
 
 	type = __nft_chain_type_get(family, NFT_CHAIN_T_DEFAULT);
 	if (!type)
@@ -2058,7 +2072,7 @@ static int nft_chain_parse_hook(struct net *net,
 
 	if (nla[NFTA_CHAIN_TYPE]) {
 		type = nf_tables_chain_type_lookup(net, nla[NFTA_CHAIN_TYPE],
-						   family, autoload);
+						   family, add);
 		if (IS_ERR(type)) {
 			NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_TYPE]);
 			return PTR_ERR(type);
@@ -2167,12 +2181,8 @@ static int nft_basechain_init(struct nft_base_chain *basechain, u8 family,
 		list_splice_init(&hook->list, &basechain->hook_list);
 		list_for_each_entry(h, &basechain->hook_list, list)
 			nft_basechain_hook_init(&h->ops, family, hook, chain);
-
-		basechain->ops.hooknum	= hook->num;
-		basechain->ops.priority	= hook->priority;
-	} else {
-		nft_basechain_hook_init(&basechain->ops, family, hook, chain);
 	}
+	nft_basechain_hook_init(&basechain->ops, family, hook, chain);
 
 	chain->flags |= NFT_CHAIN_BASE | flags;
 	basechain->policy = NF_ACCEPT;
@@ -2223,7 +2233,7 @@ static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
 
 	if (nla[NFTA_CHAIN_HOOK]) {
 		struct nft_stats __percpu *stats = NULL;
-		struct nft_chain_hook hook;
+		struct nft_chain_hook hook = {};
 
 		if (flags & NFT_CHAIN_BINDING)
 			return -EOPNOTSUPP;
@@ -2344,42 +2354,27 @@ static int nf_tables_addchain(struct nft_ctx *ctx, u8 family, u8 genmask,
 	return err;
 }
 
-static bool nft_hook_list_equal(struct list_head *hook_list1,
-				struct list_head *hook_list2)
-{
-	struct nft_hook *hook;
-	int n = 0, m = 0;
-
-	n = 0;
-	list_for_each_entry(hook, hook_list2, list) {
-		if (!nft_hook_list_find(hook_list1, hook))
-			return false;
-
-		n++;
-	}
-	list_for_each_entry(hook, hook_list1, list)
-		m++;
-
-	return n == m;
-}
-
 static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
 			      u32 flags, const struct nlattr *attr,
 			      struct netlink_ext_ack *extack)
 {
 	const struct nlattr * const *nla = ctx->nla;
+	struct nft_base_chain *basechain = NULL;
 	struct nft_table *table = ctx->table;
 	struct nft_chain *chain = ctx->chain;
-	struct nft_base_chain *basechain;
+	struct nft_chain_hook hook = {};
 	struct nft_stats *stats = NULL;
-	struct nft_chain_hook hook;
+	struct nft_hook *h, *next;
 	struct nf_hook_ops *ops;
 	struct nft_trans *trans;
+	bool unregister = false;
 	int err;
 
 	if (chain->flags ^ flags)
 		return -EOPNOTSUPP;
 
+	INIT_LIST_HEAD(&hook.list);
+
 	if (nla[NFTA_CHAIN_HOOK]) {
 		if (!nft_is_base_chain(chain)) {
 			NL_SET_BAD_ATTR(extack, attr);
@@ -2397,12 +2392,18 @@ static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
 			return -EEXIST;
 		}
 
-		if (nft_base_chain_netdev(ctx->family, hook.num)) {
-			if (!nft_hook_list_equal(&basechain->hook_list,
-						 &hook.list)) {
-				nft_chain_release_hook(&hook);
-				NL_SET_BAD_ATTR(extack, attr);
-				return -EEXIST;
+		if (nft_base_chain_netdev(ctx->family, basechain->ops.hooknum)) {
+			list_for_each_entry_safe(h, next, &hook.list, list) {
+				h->ops.pf	= basechain->ops.pf;
+				h->ops.hooknum	= basechain->ops.hooknum;
+				h->ops.priority	= basechain->ops.priority;
+				h->ops.priv	= basechain->ops.priv;
+				h->ops.hook	= basechain->ops.hook;
+
+				if (nft_hook_list_find(&basechain->hook_list, h)) {
+					list_del(&h->list);
+					kfree(h);
+				}
 			}
 		} else {
 			ops = &basechain->ops;
@@ -2413,7 +2414,6 @@ static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
 				return -EEXIST;
 			}
 		}
-		nft_chain_release_hook(&hook);
 	}
 
 	if (nla[NFTA_CHAIN_HANDLE] &&
@@ -2424,24 +2424,43 @@ static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
 					  nla[NFTA_CHAIN_NAME], genmask);
 		if (!IS_ERR(chain2)) {
 			NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
-			return -EEXIST;
+			err = -EEXIST;
+			goto err_hooks;
 		}
 	}
 
 	if (nla[NFTA_CHAIN_COUNTERS]) {
-		if (!nft_is_base_chain(chain))
-			return -EOPNOTSUPP;
+		if (!nft_is_base_chain(chain)) {
+			err = -EOPNOTSUPP;
+			goto err_hooks;
+		}
 
 		stats = nft_stats_alloc(nla[NFTA_CHAIN_COUNTERS]);
-		if (IS_ERR(stats))
-			return PTR_ERR(stats);
+		if (IS_ERR(stats)) {
+			err = PTR_ERR(stats);
+			goto err_hooks;
+		}
+	}
+
+	if (!(table->flags & NFT_TABLE_F_DORMANT) &&
+	    nft_is_base_chain(chain) &&
+	    !list_empty(&hook.list)) {
+		basechain = nft_base_chain(chain);
+		ops = &basechain->ops;
+
+		if (nft_base_chain_netdev(table->family, basechain->ops.hooknum)) {
+			err = nft_netdev_register_hooks(ctx->net, &hook.list);
+			if (err < 0)
+				goto err_hooks;
+		}
 	}
 
+	unregister = true;
 	err = -ENOMEM;
 	trans = nft_trans_alloc(ctx, NFT_MSG_NEWCHAIN,
 				sizeof(struct nft_trans_chain));
 	if (trans == NULL)
-		goto err;
+		goto err_trans;
 
 	nft_trans_chain_stats(trans) = stats;
 	nft_trans_chain_update(trans) = true;
@@ -2460,7 +2479,7 @@ static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
 		err = -ENOMEM;
 		name = nla_strdup(nla[NFTA_CHAIN_NAME], GFP_KERNEL_ACCOUNT);
 		if (!name)
-			goto err;
+			goto err_trans;
 
 		err = -EEXIST;
 		list_for_each_entry(tmp, &nft_net->commit_list, list) {
@@ -2471,18 +2490,35 @@ static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
 			    strcmp(name, nft_trans_chain_name(tmp)) == 0) {
 				NL_SET_BAD_ATTR(extack, nla[NFTA_CHAIN_NAME]);
 				kfree(name);
-				goto err;
+				goto err_trans;
 			}
 		}
 
 		nft_trans_chain_name(trans) = name;
 	}
+
+	nft_trans_basechain(trans) = basechain;
+	INIT_LIST_HEAD(&nft_trans_chain_hooks(trans));
+	list_splice(&hook.list, &nft_trans_chain_hooks(trans));
+
 	nft_trans_commit_list_add_tail(ctx->net, trans);
 
 	return 0;
-err:
+
+err_trans:
 	free_percpu(stats);
 	kfree(trans);
+err_hooks:
+	if (nla[NFTA_CHAIN_HOOK]) {
+		list_for_each_entry_safe(h, next, &hook.list, list) {
+			if (unregister)
+				nf_unregister_net_hook(ctx->net, &h->ops);
+			list_del(&h->list);
+			kfree_rcu(h, rcu);
+		}
+		module_put(hook.type->owner);
+	}
+
 	return err;
 }
 
@@ -9024,18 +9060,21 @@ static int nf_tables_commit(struct net *net, struct sk_buff *skb)
 		case NFT_MSG_NEWCHAIN:
 			if (nft_trans_chain_update(trans)) {
 				nft_chain_commit_update(trans);
-				nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
+				nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
+						       &nft_trans_chain_hooks(trans));
+				list_splice(&nft_trans_chain_hooks(trans),
+					    &nft_trans_basechain(trans)->hook_list);
 				/* trans destroyed after rcu grace period */
 			} else {
 				nft_chain_commit_drop_policy(trans);
 				nft_clear(net, trans->ctx.chain);
-				nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN);
+				nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
 				nft_trans_destroy(trans);
 			}
 			break;
 		case NFT_MSG_DELCHAIN:
 			nft_chain_del(trans->ctx.chain);
-			nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN);
+			nf_tables_chain_notify(&trans->ctx, NFT_MSG_DELCHAIN, NULL);
 			nf_tables_unregister_hook(trans->ctx.net,
 						  trans->ctx.table,
 						  trans->ctx.chain);
@@ -9191,7 +9230,10 @@ static void nf_tables_abort_release(struct nft_trans *trans)
 		nf_tables_table_destroy(&trans->ctx);
 		break;
 	case NFT_MSG_NEWCHAIN:
-		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_NEWRULE:
 		nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
@@ -9253,6 +9295,9 @@ static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
 			break;
 		case NFT_MSG_NEWCHAIN:
 			if (nft_trans_chain_update(trans)) {
+				nft_netdev_unregister_hooks(net,
+							    &nft_trans_chain_hooks(trans),
+							    true);
 				free_percpu(nft_trans_chain_stats(trans));
 				kfree(nft_trans_chain_name(trans));
 				nft_trans_destroy(trans);
-- 
2.30.2

[PATCH nf-next,v2 3/4] netfilter: nf_tables: support for deleting devices in an existing netdev chain

[Pablo Neira Ayuso]

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

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
v2: disallow device update if NFT_CHAIN_HW_OFFLOAD is set.

 net/netfilter/nf_tables_api.c | 103 ++++++++++++++++++++++++++++++----
 1 file changed, 91 insertions(+), 12 deletions(-)

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 4591104ce5f3..53531e958f01 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -1631,7 +1631,7 @@ 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;
 	}
@@ -2642,6 +2642,60 @@ 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;
+
+	err = nft_chain_parse_hook(ctx->net, nla, &chain_hook, ctx->family,
+				   extack, false);
+	if (err < 0)
+		return err;
+
+	basechain = nft_base_chain(chain);
+
+	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[])
 {
@@ -2678,12 +2732,19 @@ 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))
@@ -8586,7 +8647,10 @@ static void nft_commit_release(struct nft_trans *trans)
 		kfree(nft_trans_chain_name(trans));
 		break;
 	case NFT_MSG_DELCHAIN:
-		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:
 		nf_tables_rule_destroy(&trans->ctx, nft_trans_rule(trans));
@@ -9068,16 +9132,26 @@ static int nf_tables_commit(struct net *net, struct sk_buff *skb)
 			} else {
 				nft_chain_commit_drop_policy(trans);
 				nft_clear(net, trans->ctx.chain);
-				nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN, NULL);
+				nf_tables_chain_notify(&trans->ctx, NFT_MSG_NEWCHAIN,
+						       NULL);
 				nft_trans_destroy(trans);
 			}
 			break;
 		case NFT_MSG_DELCHAIN:
-			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);
+			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));
@@ -9314,8 +9388,13 @@ static int __nf_tables_abort(struct net *net, enum nfnl_abort_action action)
 			}
 			break;
 		case NFT_MSG_DELCHAIN:
-			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

[PATCH nf-next,v2 4/4] netfilter: nf_tables: allow to create netdev chain without device

[Pablo Neira Ayuso]

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>
---
v2: new in this series.

 net/netfilter/nf_tables_api.c | 26 +++++++++++++-------------
 1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 53531e958f01..80542877f9df 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -2005,9 +2005,8 @@ struct nft_chain_hook {
 	struct list_head		list;
 };
 
-static int nft_chain_parse_netdev(struct net *net,
-				  struct nlattr *tb[],
-				  struct list_head *hook_list)
+static int nft_chain_parse_netdev(struct net *net, struct nlattr *tb[],
+				  struct list_head *hook_list, u32 flags)
 {
 	struct nft_hook *hook;
 	int err;
@@ -2024,19 +2023,20 @@ 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;
 }
 
 static int nft_chain_parse_hook(struct net *net,
 				const struct nlattr * const nla[],
 				struct nft_chain_hook *hook, u8 family,
-				struct netlink_ext_ack *extack, bool add)
+				u32 flags, struct netlink_ext_ack *extack,
+				bool add)
 {
 	struct nftables_pernet *nft_net = nft_pernet(net);
 	struct nlattr *ha[NFTA_HOOK_MAX + 1];
@@ -2095,7 +2095,7 @@ 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);
+		err = nft_chain_parse_netdev(net, ha, &hook->list, flags);
 		if (err < 0) {
 			module_put(type->owner);
 			return err;
@@ -2238,8 +2238,8 @@ 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, nla, &hook, family, extack,
-					   true);
+		err = nft_chain_parse_hook(net, nla, &hook, family, flags,
+					   extack, true);
 		if (err < 0)
 			return err;
 
@@ -2381,7 +2381,7 @@ static int nf_tables_updchain(struct nft_ctx *ctx, u8 genmask, u8 policy,
 			return -EEXIST;
 		}
 		err = nft_chain_parse_hook(ctx->net, nla, &hook, ctx->family,
-					   extack, false);
+					   flags, extack, false);
 		if (err < 0)
 			return err;
 
@@ -2657,7 +2657,7 @@ static int nft_delchain_hook(struct nft_ctx *ctx, struct nft_chain *chain,
 		return -EOPNOTSUPP;
 
 	err = nft_chain_parse_hook(ctx->net, nla, &chain_hook, ctx->family,
-				   extack, false);
+				   chain->flags, extack, false);
 	if (err < 0)
 		return err;
 
-- 
2.30.2