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Date: Fri, 29 May 2020 02:25:37 +0200
From: Pablo Neira Ayuso <pablo@...filter.org>
To: netfilter-devel@...r.kernel.org
Cc: davem@...emloft.net, netdev@...r.kernel.org, paulb@...lanox.com,
ozsh@...lanox.com, vladbu@...lanox.com, jiri@...nulli.us,
kuba@...nel.org, saeedm@...lanox.com, michael.chan@...adcom.com,
sriharsha.basavapatna@...adcom.com
Subject: [PATCH net-next 4/8] net: use flow_indr_dev_setup_offload()
Update existing frontends to use flow_indr_dev_setup_offload().
This new function must be called if ->ndo_setup_tc is unset to deal
with tunnel devices.
If there is no driver that is subscribed to new tunnel device
flow_block bindings, then this function bails out with EOPNOTSUPP.
If the driver module is removed, the ->cleanup() callback removes the
entries that belong to this tunnel device. This cleanup procedures is
triggered when the device unregisters the tunnel device offload handler.
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
---
net/netfilter/nf_flow_table_offload.c | 19 ++++++---
net/netfilter/nf_tables_offload.c | 28 +++++++++++--
net/sched/cls_api.c | 58 +++++++++++++--------------
3 files changed, 67 insertions(+), 38 deletions(-)
diff --git a/net/netfilter/nf_flow_table_offload.c b/net/netfilter/nf_flow_table_offload.c
index 2ff4087007a6..01cfa02c43bd 100644
--- a/net/netfilter/nf_flow_table_offload.c
+++ b/net/netfilter/nf_flow_table_offload.c
@@ -942,6 +942,18 @@ static void nf_flow_table_block_offload_init(struct flow_block_offload *bo,
INIT_LIST_HEAD(&bo->cb_list);
}
+static void nf_flow_table_indr_cleanup(struct flow_block_cb *block_cb)
+{
+ struct nf_flowtable *flowtable = block_cb->indr.data;
+ struct net_device *dev = block_cb->indr.dev;
+
+ nf_flow_table_gc_cleanup(flowtable, dev);
+ down_write(&flowtable->flow_block_lock);
+ list_del(&block_cb->list);
+ flow_block_cb_free(block_cb);
+ up_write(&flowtable->flow_block_lock);
+}
+
static int nf_flow_table_indr_offload_cmd(struct flow_block_offload *bo,
struct nf_flowtable *flowtable,
struct net_device *dev,
@@ -950,12 +962,9 @@ static int nf_flow_table_indr_offload_cmd(struct flow_block_offload *bo,
{
nf_flow_table_block_offload_init(bo, dev_net(dev), cmd, flowtable,
extack);
- flow_indr_block_call(dev, bo, cmd, TC_SETUP_FT);
- if (list_empty(&bo->cb_list))
- return -EOPNOTSUPP;
-
- return 0;
+ return flow_indr_dev_setup_offload(dev, TC_SETUP_FT, flowtable, bo,
+ nf_flow_table_indr_cleanup);
}
static int nf_flow_table_offload_cmd(struct flow_block_offload *bo,
diff --git a/net/netfilter/nf_tables_offload.c b/net/netfilter/nf_tables_offload.c
index 954bccb7f32a..1960f11477e8 100644
--- a/net/netfilter/nf_tables_offload.c
+++ b/net/netfilter/nf_tables_offload.c
@@ -304,21 +304,41 @@ static void nft_indr_block_ing_cmd(struct net_device *dev,
nft_block_setup(chain, &bo, cmd);
}
-static int nft_indr_block_offload_cmd(struct nft_base_chain *chain,
+static void nft_indr_block_cleanup(struct flow_block_cb *block_cb)
+{
+ struct nft_base_chain *basechain = block_cb->indr.data;
+ struct net_device *dev = block_cb->indr.dev;
+ struct netlink_ext_ack extack = {};
+ struct net *net = dev_net(dev);
+ struct flow_block_offload bo;
+
+ nft_flow_block_offload_init(&bo, dev_net(dev), FLOW_BLOCK_UNBIND,
+ basechain, &extack);
+ mutex_lock(&net->nft.commit_mutex);
+ list_move(&block_cb->list, &bo.cb_list);
+ nft_flow_offload_unbind(&bo, basechain);
+ mutex_unlock(&net->nft.commit_mutex);
+}
+
+static int nft_indr_block_offload_cmd(struct nft_base_chain *basechain,
struct net_device *dev,
enum flow_block_command cmd)
{
struct netlink_ext_ack extack = {};
struct flow_block_offload bo;
+ int err;
- nft_flow_block_offload_init(&bo, dev_net(dev), cmd, chain, &extack);
+ nft_flow_block_offload_init(&bo, dev_net(dev), cmd, basechain, &extack);
- flow_indr_block_call(dev, &bo, cmd, TC_SETUP_BLOCK);
+ err = flow_indr_dev_setup_offload(dev, TC_SETUP_BLOCK, basechain, &bo,
+ nft_indr_block_cleanup);
+ if (err < 0)
+ return err;
if (list_empty(&bo.cb_list))
return -EOPNOTSUPP;
- return nft_block_setup(chain, &bo, cmd);
+ return nft_block_setup(basechain, &bo, cmd);
}
#define FLOW_SETUP_BLOCK TC_SETUP_BLOCK
diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index c5a2f16097b6..760e51d852f5 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -709,24 +709,26 @@ static void tcf_block_offload_init(struct flow_block_offload *bo,
INIT_LIST_HEAD(&bo->cb_list);
}
-static void tc_indr_block_call(struct tcf_block *block,
- struct net_device *dev,
- struct tcf_block_ext_info *ei,
- enum flow_block_command command,
- struct netlink_ext_ack *extack)
+static void tcf_block_unbind(struct tcf_block *block,
+ struct flow_block_offload *bo);
+
+static void tc_block_indr_cleanup(struct flow_block_cb *block_cb)
{
- struct flow_block_offload bo = {
- .command = command,
- .binder_type = ei->binder_type,
- .net = dev_net(dev),
- .block = &block->flow_block,
- .block_shared = tcf_block_shared(block),
- .extack = extack,
- };
- INIT_LIST_HEAD(&bo.cb_list);
+ struct tcf_block *block = block_cb->indr.data;
+ struct net_device *dev = block_cb->indr.dev;
+ struct netlink_ext_ack extack = {};
+ struct flow_block_offload bo;
- flow_indr_block_call(dev, &bo, command, TC_SETUP_BLOCK);
- tcf_block_setup(block, &bo);
+ tcf_block_offload_init(&bo, dev, FLOW_BLOCK_UNBIND,
+ block_cb->indr.binder_type,
+ &block->flow_block, tcf_block_shared(block),
+ &extack);
+ down_write(&block->cb_lock);
+ list_move(&block_cb->list, &bo.cb_list);
+ up_write(&block->cb_lock);
+ rtnl_lock();
+ tcf_block_unbind(block, &bo);
+ rtnl_unlock();
}
static bool tcf_block_offload_in_use(struct tcf_block *block)
@@ -747,7 +749,12 @@ static int tcf_block_offload_cmd(struct tcf_block *block,
&block->flow_block, tcf_block_shared(block),
extack);
- err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_BLOCK, &bo);
+ if (dev->netdev_ops->ndo_setup_tc)
+ err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_BLOCK, &bo);
+ else
+ err = flow_indr_dev_setup_offload(dev, TC_SETUP_BLOCK, block,
+ &bo, tc_block_indr_cleanup);
+
if (err < 0) {
if (err != -EOPNOTSUPP)
NL_SET_ERR_MSG(extack, "Driver ndo_setup_tc failed");
@@ -765,13 +772,13 @@ static int tcf_block_offload_bind(struct tcf_block *block, struct Qdisc *q,
int err;
down_write(&block->cb_lock);
- if (!dev->netdev_ops->ndo_setup_tc)
- goto no_offload_dev_inc;
/* If tc offload feature is disabled and the block we try to bind
* to already has some offloaded filters, forbid to bind.
*/
- if (!tc_can_offload(dev) && tcf_block_offload_in_use(block)) {
+ if (dev->netdev_ops->ndo_setup_tc &&
+ !tc_can_offload(dev) &&
+ tcf_block_offload_in_use(block)) {
NL_SET_ERR_MSG(extack, "Bind to offloaded block failed as dev has offload disabled");
err = -EOPNOTSUPP;
goto err_unlock;
@@ -783,18 +790,15 @@ static int tcf_block_offload_bind(struct tcf_block *block, struct Qdisc *q,
if (err)
goto err_unlock;
- tc_indr_block_call(block, dev, ei, FLOW_BLOCK_BIND, extack);
up_write(&block->cb_lock);
return 0;
no_offload_dev_inc:
- if (tcf_block_offload_in_use(block)) {
- err = -EOPNOTSUPP;
+ if (tcf_block_offload_in_use(block))
goto err_unlock;
- }
+
err = 0;
block->nooffloaddevcnt++;
- tc_indr_block_call(block, dev, ei, FLOW_BLOCK_BIND, extack);
err_unlock:
up_write(&block->cb_lock);
return err;
@@ -807,10 +811,6 @@ static void tcf_block_offload_unbind(struct tcf_block *block, struct Qdisc *q,
int err;
down_write(&block->cb_lock);
- tc_indr_block_call(block, dev, ei, FLOW_BLOCK_UNBIND, NULL);
-
- if (!dev->netdev_ops->ndo_setup_tc)
- goto no_offload_dev_dec;
err = tcf_block_offload_cmd(block, dev, ei, FLOW_BLOCK_UNBIND, NULL);
if (err == -EOPNOTSUPP)
goto no_offload_dev_dec;
--
2.20.1
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