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Date: Thu, 1 Aug 2019 11:58:59 +0800
From: Yunsheng Lin <linyunsheng@...wei.com>
To: <wenxu@...oud.cn>, <jiri@...nulli.us>, <pablo@...filter.org>,
<fw@...len.de>, <jakub.kicinski@...ronome.com>
CC: <netfilter-devel@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v5 6/6] netfilter: nf_tables_offload: support
indr block call
On 2019/8/1 11:03, wenxu@...oud.cn wrote:
> From: wenxu <wenxu@...oud.cn>
>
> nftable support indr-block call. It makes nftable an offload vlan
> and tunnel device.
>
> nft add table netdev firewall
> nft add chain netdev firewall aclout { type filter hook ingress offload device mlx_pf0vf0 priority - 300 \; }
> nft add rule netdev firewall aclout ip daddr 10.0.0.1 fwd to vlan0
> nft add chain netdev firewall aclin { type filter hook ingress device vlan0 priority - 300 \; }
> nft add rule netdev firewall aclin ip daddr 10.0.0.7 fwd to mlx_pf0vf0
>
> Signed-off-by: wenxu <wenxu@...oud.cn>
> ---
> v5: add nft_get_default_block
>
> include/net/netfilter/nf_tables_offload.h | 2 +
> net/netfilter/nf_tables_api.c | 7 ++
> net/netfilter/nf_tables_offload.c | 156 +++++++++++++++++++++++++-----
> 3 files changed, 141 insertions(+), 24 deletions(-)
>
> diff --git a/include/net/netfilter/nf_tables_offload.h b/include/net/netfilter/nf_tables_offload.h
> index 3196663..ac69087 100644
> --- a/include/net/netfilter/nf_tables_offload.h
> +++ b/include/net/netfilter/nf_tables_offload.h
> @@ -63,6 +63,8 @@ struct nft_flow_rule {
> struct nft_flow_rule *nft_flow_rule_create(const struct nft_rule *rule);
> void nft_flow_rule_destroy(struct nft_flow_rule *flow);
> int nft_flow_rule_offload_commit(struct net *net);
> +bool nft_indr_get_default_block(struct net_device *dev,
> + struct flow_indr_block_info *info);
>
> #define NFT_OFFLOAD_MATCH(__key, __base, __field, __len, __reg) \
> (__reg)->base_offset = \
> diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
> index 605a7cf..6a1d0b2 100644
> --- a/net/netfilter/nf_tables_api.c
> +++ b/net/netfilter/nf_tables_api.c
> @@ -7593,6 +7593,11 @@ static void __net_exit nf_tables_exit_net(struct net *net)
> .exit = nf_tables_exit_net,
> };
>
> +static struct flow_indr_get_block_entry get_block_entry = {
> + .get_block_cb = nft_indr_get_default_block,
> + .list = LIST_HEAD_INIT(get_block_entry.list),
> +};
> +
> static int __init nf_tables_module_init(void)
> {
> int err;
> @@ -7624,6 +7629,7 @@ static int __init nf_tables_module_init(void)
> goto err5;
>
> nft_chain_route_init();
> + flow_indr_add_default_block_cb(&get_block_entry);
> return err;
> err5:
> rhltable_destroy(&nft_objname_ht);
> @@ -7640,6 +7646,7 @@ static int __init nf_tables_module_init(void)
>
> static void __exit nf_tables_module_exit(void)
> {
> + flow_indr_del_default_block_cb(&get_block_entry);
> nfnetlink_subsys_unregister(&nf_tables_subsys);
> unregister_netdevice_notifier(&nf_tables_flowtable_notifier);
> nft_chain_filter_fini();
> diff --git a/net/netfilter/nf_tables_offload.c b/net/netfilter/nf_tables_offload.c
> index 64f5fd5..59c9629 100644
> --- a/net/netfilter/nf_tables_offload.c
> +++ b/net/netfilter/nf_tables_offload.c
> @@ -171,24 +171,114 @@ static int nft_flow_offload_unbind(struct flow_block_offload *bo,
> return 0;
> }
>
> +static int nft_block_setup(struct nft_base_chain *basechain,
> + struct flow_block_offload *bo,
> + enum flow_block_command cmd)
> +{
> + int err;
> +
> + switch (cmd) {
> + case FLOW_BLOCK_BIND:
> + err = nft_flow_offload_bind(bo, basechain);
> + break;
> + case FLOW_BLOCK_UNBIND:
> + err = nft_flow_offload_unbind(bo, basechain);
> + break;
> + default:
> + WARN_ON_ONCE(1);
> + err = -EOPNOTSUPP;
> + }
> +
> + return err;
> +}
> +
> +static int nft_block_offload_cmd(struct nft_base_chain *chain,
> + struct net_device *dev,
> + enum flow_block_command cmd)
> +{
> + struct netlink_ext_ack extack = {};
> + struct flow_block_offload bo = {};
> + int err;
> +
> + bo.net = dev_net(dev);
> + bo.block = &chain->flow_block;
> + bo.command = cmd;
> + bo.binder_type = FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS;
> + bo.extack = &extack;
> + INIT_LIST_HEAD(&bo.cb_list);
> +
> + err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_BLOCK, &bo);
> + if (err < 0)
> + return err;
> +
> + return nft_block_setup(chain, &bo, cmd);
> +}
> +
> +static void nft_indr_block_ing_cmd(struct net_device *dev,
> + struct flow_block *flow_block,
> + flow_indr_block_bind_cb_t *cb,
> + void *cb_priv,
> + enum flow_block_command cmd)
> +{
> + struct netlink_ext_ack extack = {};
> + struct flow_block_offload bo = {};
> + struct nft_base_chain *chain;
> +
> + if (flow_block)
> + return;
Maybe "if (!flow_block)" ?
> +
> + chain = container_of(flow_block, struct nft_base_chain, flow_block);
> +
> + bo.net = dev_net(dev);
> + bo.block = flow_block;
> + bo.command = cmd;
> + bo.binder_type = FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS;
> + bo.extack = &extack;
> + INIT_LIST_HEAD(&bo.cb_list);
> +
> + cb(dev, cb_priv, TC_SETUP_BLOCK, &bo);
> +
> + nft_block_setup(chain, &bo, cmd);
> +}
> +
> +static int nft_indr_block_offload_cmd(struct nft_base_chain *chain,
> + struct net_device *dev,
> + enum flow_block_command cmd)
> +{
> + struct flow_block_offload bo = {};
> + struct netlink_ext_ack extack = {};
> +
> + bo.net = dev_net(dev);
> + bo.block = &chain->flow_block;
> + bo.command = cmd;
> + bo.binder_type = FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS;
> + bo.extack = &extack;
> + INIT_LIST_HEAD(&bo.cb_list);
> +
> + flow_indr_block_call(&chain->flow_block, dev, nft_indr_block_ing_cmd,
> + &bo, cmd);
> +
> + if (list_empty(&bo.cb_list))
> + return -EOPNOTSUPP;
> +
> + return nft_block_setup(chain, &bo, cmd);
> +}
> +
> #define FLOW_SETUP_BLOCK TC_SETUP_BLOCK
>
> static int nft_flow_offload_chain(struct nft_trans *trans,
> enum flow_block_command cmd)
> {
> struct nft_chain *chain = trans->ctx.chain;
> - struct netlink_ext_ack extack = {};
> - struct flow_block_offload bo = {};
> struct nft_base_chain *basechain;
> struct net_device *dev;
> - int err;
>
> if (!nft_is_base_chain(chain))
> return -EOPNOTSUPP;
>
> basechain = nft_base_chain(chain);
> dev = basechain->ops.dev;
> - if (!dev || !dev->netdev_ops->ndo_setup_tc)
> + if (!dev)
> return -EOPNOTSUPP;
>
> /* Only default policy to accept is supported for now. */
> @@ -197,26 +287,10 @@ static int nft_flow_offload_chain(struct nft_trans *trans,
> nft_trans_chain_policy(trans) != NF_ACCEPT)
> return -EOPNOTSUPP;
>
> - bo.command = cmd;
> - bo.block = &basechain->flow_block;
> - bo.binder_type = FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS;
> - bo.extack = &extack;
> - INIT_LIST_HEAD(&bo.cb_list);
> -
> - err = dev->netdev_ops->ndo_setup_tc(dev, FLOW_SETUP_BLOCK, &bo);
> - if (err < 0)
> - return err;
> -
> - switch (cmd) {
> - case FLOW_BLOCK_BIND:
> - err = nft_flow_offload_bind(&bo, basechain);
> - break;
> - case FLOW_BLOCK_UNBIND:
> - err = nft_flow_offload_unbind(&bo, basechain);
> - break;
> - }
> -
> - return err;
> + if (dev->netdev_ops->ndo_setup_tc)
> + return nft_block_offload_cmd(basechain, dev, cmd);
> + else
> + return nft_indr_block_offload_cmd(basechain, dev, cmd);
> }
>
> int nft_flow_rule_offload_commit(struct net *net)
> @@ -266,3 +340,37 @@ int nft_flow_rule_offload_commit(struct net *net)
>
> return err;
> }
> +
> +bool nft_indr_get_default_block(struct net_device *dev,
> + struct flow_indr_block_info *info)
> +{
> + struct net *net = dev_net(dev);
> + const struct nft_table *table;
> + const struct nft_chain *chain;
> +
> + rcu_read_lock();
> +
> + list_for_each_entry_rcu(table, &net->nft.tables, list) {
> + if (table->family != NFPROTO_NETDEV)
> + continue;
> +
> + list_for_each_entry_rcu(chain, &table->chains, list) {
> + if (nft_is_base_chain(chain)) {
> + struct nft_base_chain *basechain;
> +
> + basechain = nft_base_chain(chain);
> + if (!strncmp(basechain->dev_name, dev->name,
> + IFNAMSIZ)) {
> + info->flow_block = &basechain->flow_block;
> + info->ing_cmd_cb = nft_indr_block_ing_cmd;
> + rcu_read_unlock();
> + return true;
> + }
> + }
> + }
> + }
> +
> + rcu_read_unlock();
> +
> + return false;
> +}
>
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