From: wenxu <we...@ucloud.cn>
The fragment packets do defrag in act_ct module. If the reassembled
packet should send out to another net device. This over mtu big packet
should be fragmented to send out. This patch add the act ct_output to
archive this.
Signed-off-by: wenxu <we...@ucloud.cn>
---
include/net/tc_act/tc_ct_output.h | 40 ++
include/uapi/linux/pkt_cls.h | 1 +
include/uapi/linux/tc_act/tc_ct_output.h | 26 ++
net/sched/Kconfig | 11 +
net/sched/Makefile | 1 +
net/sched/act_ct_output.c | 614 +++++++++++++++++++++++++++++++
6 files changed, 693 insertions(+)
create mode 100644 include/net/tc_act/tc_ct_output.h
create mode 100644 include/uapi/linux/tc_act/tc_ct_output.h
create mode 100644 net/sched/act_ct_output.c
diff --git a/include/net/tc_act/tc_ct_output.h
b/include/net/tc_act/tc_ct_output.h
new file mode 100644
index 0000000..ac2690b
--- /dev/null
+++ b/include/net/tc_act/tc_ct_output.h
@@ -0,0 +1,40 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __NET_TC_CT_OUTPUT_H
+#define __NET_TC_CT_OUTPUT_H
+
+#include <net/act_api.h>
+#include <linux/tc_act/tc_ct_output.h>
+
+struct tcf_ct_output {
+ struct tc_action common;
+ int tcfm_eaction;
+ bool tcfm_mac_header_xmit;
+ struct net_device __rcu *tcfm_dev;
+ struct list_head tcfm_list;
+};
+#define to_ct_output(a) ((struct tcf_ct_output *)a)
+
+static inline bool is_tcf_ct_output_redirect(const struct tc_action *a)
+{
+#ifdef CONFIG_NET_CLS_ACT
+ if (a->ops && a->ops->id == TCA_ID_CT_OUTPUT)
+ return to_ct_output(a)->tcfm_eaction == TCA_CT_OUTPUT_REDIR;
+#endif
+ return false;
+}
+
+static inline bool is_tcf_ct_output_mirror(const struct tc_action *a)
+{
+#ifdef CONFIG_NET_CLS_ACT
+ if (a->ops && a->ops->id == TCA_ID_CT_OUTPUT)
+ return to_ct_output(a)->tcfm_eaction == TCA_CT_OUTPUT_MIRROR;
+#endif
+ return false;
+}
+
+static inline struct net_device *tcf_ct_output_dev(const struct tc_action *a)
+{
+ return rtnl_dereference(to_ct_output(a)->tcfm_dev);
+}
+
+#endif /* __NET_TC_CT_OUTPUT_H */
diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h
index ee95f42..5a79f72 100644
--- a/include/uapi/linux/pkt_cls.h
+++ b/include/uapi/linux/pkt_cls.h
@@ -135,6 +135,7 @@ enum tca_id {
TCA_ID_MPLS,
TCA_ID_CT,
TCA_ID_GATE,
+ TCA_ID_CT_OUTPUT,
/* other actions go here */
__TCA_ID_MAX = 255
};
diff --git a/include/uapi/linux/tc_act/tc_ct_output.h
b/include/uapi/linux/tc_act/tc_ct_output.h
new file mode 100644
index 0000000..6c6dd2b
--- /dev/null
+++ b/include/uapi/linux/tc_act/tc_ct_output.h
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef __LINUX_TC_MIR_H
+#define __LINUX_TC_MIR_H
+
+#include <linux/types.h>
+#include <linux/pkt_cls.h>
+
+#define TCA_CT_OUTPUT_REDIR 1 /* packet redirect to EGRESS*/
+#define TCA_CT_OUTPUT_MIRROR 2 /* mirror packet to EGRESS */
+
+struct tc_ct_output {
+ tc_gen;
+ int eaction; /* one of MIRROR/REDIR */
+ __u32 ifindex; /* ifindex of egress port */
+};
+
+enum {
+ TCA_CT_OUTPUT_UNSPEC,
+ TCA_CT_OUTPUT_TM,
+ TCA_CT_OUTPUT_PARMS,
+ TCA_CT_OUTPUT_PAD,
+ __TCA_CT_OUTPUT_MAX
+};
+#define TCA_CT_OUTPUT_MAX (__TCA_CT_OUTPUT_MAX - 1)
+
+#endif
diff --git a/net/sched/Kconfig b/net/sched/Kconfig
index a3b37d8..352d058b 100644
--- a/net/sched/Kconfig
+++ b/net/sched/Kconfig
@@ -985,6 +985,17 @@ config NET_ACT_CT
To compile this code as a module, choose M here: the
module will be called act_ct.
+config NET_ACT_CT_OUTPUT
+ tristate "connection tracking output tc action"
+ depends on NET_CLS_ACT && NF_CONNTRACK
+ help
+ Say Y here to allow outputing the connracked packets
+
+ If unsure, say N.
+
+ To compile this code as a module, choose M here: the
+ module will be called act_ct_output.
+
config NET_ACT_GATE
tristate "Frame gate entry list control tc action"
depends on NET_CLS_ACT
diff --git a/net/sched/Makefile b/net/sched/Makefile
index 66bbf9a..401a2b2 100644
--- a/net/sched/Makefile
+++ b/net/sched/Makefile
@@ -31,6 +31,7 @@ obj-$(CONFIG_NET_IFE_SKBTCINDEX) += act_meta_skbtcindex.o
obj-$(CONFIG_NET_ACT_TUNNEL_KEY)+= act_tunnel_key.o
obj-$(CONFIG_NET_ACT_CT) += act_ct.o
obj-$(CONFIG_NET_ACT_GATE) += act_gate.o
+obj-$(CONFIG_NET_ACT_CT_OUTPUT) += act_ct_output.o
obj-$(CONFIG_NET_SCH_FIFO) += sch_fifo.o
obj-$(CONFIG_NET_SCH_CBQ) += sch_cbq.o
obj-$(CONFIG_NET_SCH_HTB) += sch_htb.o
diff --git a/net/sched/act_ct_output.c b/net/sched/act_ct_output.c
new file mode 100644
index 0000000..a2283be
--- /dev/null
+++ b/net/sched/act_ct_output.c
@@ -0,0 +1,614 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/skbuff.h>
+#include <linux/rtnetlink.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/gfp.h>
+#include <linux/if_arp.h>
+#include <net/net_namespace.h>
+#include <net/netlink.h>
+#include <net/pkt_sched.h>
+#include <net/pkt_cls.h>
+#include <net/dst.h>
+#include <net/ip.h>
+#include <net/ip6_fib.h>
+#include <linux/netfilter_ipv6.h>
+#include <linux/tc_act/tc_ct_output.h>
+#include <net/tc_act/tc_ct_output.h>
+
+static LIST_HEAD(ct_output_list);
+static DEFINE_SPINLOCK(ct_output_list_lock);
+
+#define CT_OUTPUT_RECURSION_LIMIT 4
+static DEFINE_PER_CPU(unsigned int, ct_output_rec_level);
+
+struct tcf_ct_output_frag_data {
+ unsigned long dst;
+ struct qdisc_skb_cb cb;
+ __be16 inner_protocol;
+ u16 vlan_tci;
+ __be16 vlan_proto;
+ unsigned int l2_len;
+ u8 l2_data[VLAN_ETH_HLEN];
+};
+
+static DEFINE_PER_CPU(struct tcf_ct_output_frag_data,
tcf_ct_output_frag_data_storage);
+
+static bool tcf_ct_output_is_act_redirect(int action)
+{
+ return action == TCA_CT_OUTPUT_REDIR;
+}
+
+static bool tcf_ct_output_can_reinsert(int action)
+{
+ switch (action) {
+ case TC_ACT_SHOT:
+ case TC_ACT_STOLEN:
+ case TC_ACT_QUEUED:
+ case TC_ACT_TRAP:
+ return true;
+ }
+ return false;
+}
+
+static struct net_device *tcf_ct_output_dev_dereference(struct tcf_ct_output
*m)
+{
+ return rcu_dereference_protected(m->tcfm_dev,
+ lockdep_is_held(&m->tcf_lock));
+}
+
+static void tcf_ct_output_release(struct tc_action *a)
+{
+ struct tcf_ct_output *m = to_ct_output(a);
+ struct net_device *dev;
+
+ spin_lock(&ct_output_list_lock);
+ list_del(&m->tcfm_list);
+ spin_unlock(&ct_output_list_lock);
+
+ /* last reference to action, no need to lock */
+ dev = rcu_dereference_protected(m->tcfm_dev, 1);
+ if (dev)
+ dev_put(dev);
+}
+
+static const struct nla_policy ct_output_policy[TCA_CT_OUTPUT_MAX + 1] = {
+ [TCA_CT_OUTPUT_PARMS] = { .len = sizeof(struct tc_ct_output) },
+};
+
+static unsigned int ct_output_net_id;
+static struct tc_action_ops act_ct_output_ops;
+
+static int tcf_ct_output_init(struct net *net, struct nlattr *nla,
+ struct nlattr *est, struct tc_action **a,
+ int ovr, int bind, bool rtnl_held,
+ struct tcf_proto *tp,
+ u32 flags, struct netlink_ext_ack *extack)
+{
+ struct tc_action_net *tn = net_generic(net, ct_output_net_id);
+ struct nlattr *tb[TCA_CT_OUTPUT_MAX + 1];
+ struct tcf_chain *goto_ch = NULL;
+ bool mac_header_xmit = false;
+ struct tc_ct_output *parm;
+ struct tcf_ct_output *m;
+ struct net_device *dev;
+ bool exists = false;
+ int ret, err;
+ u32 index;
+
+ if (!nla) {
+ NL_SET_ERR_MSG_MOD(extack, "ct_output requires attributes to be
passed");
+ return -EINVAL;
+ }
+ ret = nla_parse_nested_deprecated(tb, TCA_CT_OUTPUT_MAX, nla,
+ ct_output_policy, extack);
+ if (ret < 0)
+ return ret;
+ if (!tb[TCA_CT_OUTPUT_PARMS]) {
+ NL_SET_ERR_MSG_MOD(extack, "Missing required ct_output
parameters");
+ return -EINVAL;
+ }
+ parm = nla_data(tb[TCA_CT_OUTPUT_PARMS]);
+ index = parm->index;
+ err = tcf_idr_check_alloc(tn, &index, a, bind);
+ if (err < 0)
+ return err;
+ exists = err;
+ if (exists && bind)
+ return 0;
+
+ switch (parm->eaction) {
+ case TCA_CT_OUTPUT_MIRROR:
+ case TCA_CT_OUTPUT_REDIR:
+ break;
+ default:
+ if (exists)
+ tcf_idr_release(*a, bind);
+ else
+ tcf_idr_cleanup(tn, index);
+ NL_SET_ERR_MSG_MOD(extack, "Unknown ct_output option");
+ return -EINVAL;
+ }
+
+ if (!exists) {
+ if (!parm->ifindex) {
+ tcf_idr_cleanup(tn, index);
+ NL_SET_ERR_MSG_MOD(extack, "Specified device does not
exist");
+ return -EINVAL;
+ }
+ ret = tcf_idr_create_from_flags(tn, index, est, a,
+ &act_ct_output_ops, bind,
flags);
+ if (ret) {
+ tcf_idr_cleanup(tn, index);
+ return ret;
+ }
+ ret = ACT_P_CREATED;
+ } else if (!ovr) {
+ tcf_idr_release(*a, bind);
+ return -EEXIST;
+ }
+
+ m = to_ct_output(*a);
+ if (ret == ACT_P_CREATED)
+ INIT_LIST_HEAD(&m->tcfm_list);
+
+ err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
+ if (err < 0)
+ goto release_idr;
+
+ spin_lock_bh(&m->tcf_lock);
+
+ if (parm->ifindex) {
+ dev = dev_get_by_index(net, parm->ifindex);
+ if (!dev) {
+ spin_unlock_bh(&m->tcf_lock);
+ err = -ENODEV;
+ goto put_chain;
+ }
+ mac_header_xmit = dev_is_mac_header_xmit(dev);
+ dev = rcu_replace_pointer(m->tcfm_dev, dev,
+ lockdep_is_held(&m->tcf_lock));
+ if (dev)
+ dev_put(dev);
+ m->tcfm_mac_header_xmit = mac_header_xmit;
+ }
+ goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
+ m->tcfm_eaction = parm->eaction;
+ spin_unlock_bh(&m->tcf_lock);
+ if (goto_ch)
+ tcf_chain_put_by_act(goto_ch);
+
+ if (ret == ACT_P_CREATED) {
+ spin_lock(&ct_output_list_lock);
+ list_add(&m->tcfm_list, &ct_output_list);
+ spin_unlock(&ct_output_list_lock);
+
+ tcf_idr_insert(tn, *a);
+ }
+
+ return ret;
+put_chain:
+ if (goto_ch)
+ tcf_chain_put_by_act(goto_ch);
+release_idr:
+ tcf_idr_release(*a, bind);
+ return err;
+}
+
+static int tcf_ct_output_output(struct net *net, struct sock *sk, struct
sk_buff *skb)
+{
+ struct tcf_ct_output_frag_data *data =
this_cpu_ptr(&tcf_ct_output_frag_data_storage);
+
+ if (skb_cow_head(skb, data->l2_len) < 0) {
+ kfree_skb(skb);
+ return -ENOMEM;
+ }
+
+ __skb_dst_copy(skb, data->dst);
+ *qdisc_skb_cb(skb) = data->cb;
+ skb->inner_protocol = data->inner_protocol;
+ if (data->vlan_tci & VLAN_CFI_MASK)
+ __vlan_hwaccel_put_tag(skb, data->vlan_proto, data->vlan_tci &
~VLAN_CFI_MASK);
+ else
+ __vlan_hwaccel_clear_tag(skb);
+
+ /* Reconstruct the MAC header. */
+ skb_push(skb, data->l2_len);
+ memcpy(skb->data, &data->l2_data, data->l2_len);
+ skb_postpush_rcsum(skb, skb->data, data->l2_len);
+ skb_reset_mac_header(skb);
+
+ dev_queue_xmit(skb);
+
+ return 0;
+}
+
+static void tcf_ct_output_prepare_frag(struct sk_buff *skb)
+{
+ unsigned int hlen = skb_network_offset(skb);
+ struct tcf_ct_output_frag_data *data;
+
+ data = this_cpu_ptr(&tcf_ct_output_frag_data_storage);
+ data->dst = skb->_skb_refdst;
+ data->cb = *qdisc_skb_cb(skb);
+ data->inner_protocol = skb->inner_protocol;
+ if (skb_vlan_tag_present(skb))
+ data->vlan_tci = skb_vlan_tag_get(skb) | VLAN_CFI_MASK;
+ else
+ data->vlan_tci = 0;
+ data->vlan_proto = skb->vlan_proto;
+ data->l2_len = hlen;
+ memcpy(&data->l2_data, skb->data, hlen);
+
+ memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));
+ skb_pull(skb, hlen);
+}
+
+static unsigned int
+tcf_ct_output_dst_get_mtu(const struct dst_entry *dst)
+{
+ return dst->dev->mtu;
+}
+
+static struct dst_ops tcf_ct_output_dst_ops = {
+ .family = AF_UNSPEC,
+ .mtu = tcf_ct_output_dst_get_mtu,
+};
+
+static int tcf_ct_output_fragment(struct net *net, struct sk_buff *skb, u16
mru)
+{
+ if (skb_network_offset(skb) > VLAN_ETH_HLEN) {
+ net_warn_ratelimited("L2 header too long to fragment\n");
+ goto err;
+ }
+
+ if (skb->protocol == htons(ETH_P_IP)) {
+ struct dst_entry tcf_ct_output_dst;
+ unsigned long orig_dst;
+
+ tcf_ct_output_prepare_frag(skb);
+ dst_init(&tcf_ct_output_dst, &tcf_ct_output_dst_ops, NULL, 1,
+ DST_OBSOLETE_NONE, DST_NOCOUNT);
+ tcf_ct_output_dst.dev = skb->dev;
+
+ orig_dst = skb->_skb_refdst;
+ skb_dst_set_noref(skb, &tcf_ct_output_dst);
+ IPCB(skb)->frag_max_size = mru;
+
+ ip_do_fragment(net, skb->sk, skb, tcf_ct_output_output);
+ refdst_drop(orig_dst);
+ } else if (skb->protocol == htons(ETH_P_IPV6)) {
+ const struct nf_ipv6_ops *v6ops = nf_get_ipv6_ops();
+ unsigned long orig_dst;
+ struct rt6_info tcf_ct_output_rt;
+
+ if (!v6ops)
+ goto err;
+
+ tcf_ct_output_prepare_frag(skb);
+ memset(&tcf_ct_output_rt, 0, sizeof(tcf_ct_output_rt));
+ dst_init(&tcf_ct_output_rt.dst, &tcf_ct_output_dst_ops, NULL, 1,
+ DST_OBSOLETE_NONE, DST_NOCOUNT);
+ tcf_ct_output_rt.dst.dev = skb->dev;
+
+ orig_dst = skb->_skb_refdst;
+ skb_dst_set_noref(skb, &tcf_ct_output_rt.dst);
+ IP6CB(skb)->frag_max_size = mru;
+
+ v6ops->fragment(net, skb->sk, skb, tcf_ct_output_output);
+ refdst_drop(orig_dst);
+ } else {
+ net_warn_ratelimited("Failed fragment ->%s: eth=%04x, MRU=%d,
MTU=%d.\n",
+ netdev_name(skb->dev),
ntohs(skb->protocol),
+ mru, skb->dev->mtu);
+ goto err;
+ }
+
+ qdisc_skb_cb(skb)->mru = 0;
+ return 0;
+err:
+ kfree_skb(skb);
+ return -1;
+}
+
+static int tcf_ct_output_forward(struct sk_buff *skb)
+{
+ u16 mru = qdisc_skb_cb(skb)->mru;
+ int err;
+
+ if (mru && skb->len > mru + skb->dev->hard_header_len)
+ err = tcf_ct_output_fragment(dev_net(skb->dev), skb, mru);
+ else
+ err = dev_queue_xmit(skb);
+
+ return err;
+}
+
+static int tcf_ct_output_act(struct sk_buff *skb, const struct tc_action *a,
+ struct tcf_result *res)
+{
+ struct tcf_ct_output *m = to_ct_output(a);
+ struct sk_buff *skb2 = skb;
+ bool m_mac_header_xmit;
+ struct net_device *dev;
+ unsigned int rec_level;
+ int retval, err = 0;
+ bool use_reinsert;
+ bool is_redirect;
+ bool expects_nh;
+ int m_eaction;
+ int mac_len;
+ bool at_nh;
+
+ rec_level = __this_cpu_inc_return(ct_output_rec_level);
+ if (unlikely(rec_level > CT_OUTPUT_RECURSION_LIMIT)) {
+ net_warn_ratelimited("Packet exceeded ct_output recursion limit
on dev %s\n",
+ netdev_name(skb->dev));
+ __this_cpu_dec(ct_output_rec_level);
+ return TC_ACT_SHOT;
+ }
+
+ tcf_lastuse_update(&m->tcf_tm);
+ tcf_action_update_bstats(&m->common, skb);
+
+ m_mac_header_xmit = READ_ONCE(m->tcfm_mac_header_xmit);
+ m_eaction = READ_ONCE(m->tcfm_eaction);
+ retval = READ_ONCE(m->tcf_action);
+ dev = rcu_dereference_bh(m->tcfm_dev);
+ if (unlikely(!dev)) {
+ pr_notice_once("tc ct_output: target device is gone\n");
+ goto out;
+ }
+
+ if (unlikely(!(dev->flags & IFF_UP))) {
+ net_notice_ratelimited("tc ct_output to Houston: device %s is
down\n",
+ dev->name);
+ goto out;
+ }
+
+ /* we could easily avoid the clone only if called by ingress and clsact;
+ * since we can't easily detect the clsact caller, skip clone only for
+ * ingress - that covers the TC S/W datapath.
+ */
+ is_redirect = tcf_ct_output_is_act_redirect(m_eaction);
+ use_reinsert = skb_at_tc_ingress(skb) && is_redirect &&
+ tcf_ct_output_can_reinsert(retval);
+ if (!use_reinsert) {
+ skb2 = skb_clone(skb, GFP_ATOMIC);
+ if (!skb2)
+ goto out;
+ }
+
+ expects_nh = !m_mac_header_xmit;
+ at_nh = skb->data == skb_network_header(skb);
+ if (at_nh != expects_nh) {
+ mac_len = skb_at_tc_ingress(skb) ? skb->mac_len :
+ skb_network_header(skb) - skb_mac_header(skb);
+ if (expects_nh) {
+ /* target device/action expect data at nh */
+ skb_pull_rcsum(skb2, mac_len);
+ } else {
+ /* target device/action expect data at mac */
+ skb_push_rcsum(skb2, mac_len);
+ }
+ }
+
+ skb2->skb_iif = skb->dev->ifindex;
+ skb2->dev = dev;
+
+ /* mirror is always swallowed */
+ if (is_redirect) {
+ skb_set_redirected(skb2, skb2->tc_at_ingress);
+
+ /* let's the caller reinsert the packet, if possible */
+ if (use_reinsert) {
+ if (tcf_ct_output_forward(skb))
+ tcf_action_inc_overlimit_qstats(&m->common);
+ __this_cpu_dec(ct_output_rec_level);
+ return TC_ACT_CONSUMED;
+ }
+ }
+
+ err = tcf_ct_output_forward(skb2);
+ if (err) {
+out:
+ tcf_action_inc_overlimit_qstats(&m->common);
+ if (tcf_ct_output_is_act_redirect(m_eaction))
+ retval = TC_ACT_SHOT;
+ }
+ __this_cpu_dec(ct_output_rec_level);
+
+ return retval;
+}
+
+static void tcf_stats_update(struct tc_action *a, u64 bytes, u64 packets,
+ u64 drops, u64 lastuse, bool hw)
+{
+ struct tcf_ct_output *m = to_ct_output(a);
+ struct tcf_t *tm = &m->tcf_tm;
+
+ tcf_action_update_stats(a, bytes, packets, drops, hw);
+ tm->lastuse = max_t(u64, tm->lastuse, lastuse);
+}
+
+static int tcf_ct_output_dump(struct sk_buff *skb, struct tc_action *a,
+ int bind, int ref)
+{
+ unsigned char *b = skb_tail_pointer(skb);
+ struct tcf_ct_output *m = to_ct_output(a);
+ struct tc_ct_output opt = {
+ .index = m->tcf_index,
+ .refcnt = refcount_read(&m->tcf_refcnt) - ref,
+ .bindcnt = atomic_read(&m->tcf_bindcnt) - bind,
+ };
+ struct net_device *dev;
+ struct tcf_t t;
+
+ spin_lock_bh(&m->tcf_lock);
+ opt.action = m->tcf_action;
+ opt.eaction = m->tcfm_eaction;
+ dev = tcf_ct_output_dev_dereference(m);
+ if (dev)
+ opt.ifindex = dev->ifindex;
+
+ if (nla_put(skb, TCA_CT_OUTPUT_PARMS, sizeof(opt), &opt))
+ goto nla_put_failure;
+
+ tcf_tm_dump(&t, &m->tcf_tm);
+ if (nla_put_64bit(skb, TCA_CT_OUTPUT_TM, sizeof(t), &t,
TCA_CT_OUTPUT_PAD))
+ goto nla_put_failure;
+ spin_unlock_bh(&m->tcf_lock);
+
+ return skb->len;
+
+nla_put_failure:
+ spin_unlock_bh(&m->tcf_lock);
+ nlmsg_trim(skb, b);
+ return -1;
+}
+
+static int tcf_ct_output_walker(struct net *net, struct sk_buff *skb,
+ struct netlink_callback *cb, int type,
+ const struct tc_action_ops *ops,
+ struct netlink_ext_ack *extack)
+{
+ struct tc_action_net *tn = net_generic(net, ct_output_net_id);
+
+ return tcf_generic_walker(tn, skb, cb, type, ops, extack);
+}
+
+static int tcf_ct_output_search(struct net *net, struct tc_action **a, u32
index)
+{
+ struct tc_action_net *tn = net_generic(net, ct_output_net_id);
+
+ return tcf_idr_search(tn, a, index);
+}
+
+static int ct_output_device_event(struct notifier_block *unused,
+ unsigned long event, void *ptr)
+{
+ struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+ struct tcf_ct_output *m;
+
+ ASSERT_RTNL();
+ if (event == NETDEV_UNREGISTER) {
+ spin_lock(&ct_output_list_lock);
+ list_for_each_entry(m, &ct_output_list, tcfm_list) {
+ spin_lock_bh(&m->tcf_lock);
+ if (tcf_ct_output_dev_dereference(m) == dev) {
+ dev_put(dev);
+ /* Note : no rcu grace period necessary, as
+ * net_device are already rcu protected.
+ */
+ RCU_INIT_POINTER(m->tcfm_dev, NULL);
+ }
+ spin_unlock_bh(&m->tcf_lock);
+ }
+ spin_unlock(&ct_output_list_lock);
+ }
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block ct_output_device_notifier = {
+ .notifier_call = ct_output_device_event,
+};
+
+static void tcf_ct_output_dev_put(void *priv)
+{
+ struct net_device *dev = priv;
+
+ dev_put(dev);
+}
+
+static struct net_device *
+tcf_ct_output_get_dev(const struct tc_action *a,
+ tc_action_priv_destructor *destructor)
+{
+ struct tcf_ct_output *m = to_ct_output(a);
+ struct net_device *dev;
+
+ rcu_read_lock();
+ dev = rcu_dereference(m->tcfm_dev);
+ if (dev) {
+ dev_hold(dev);
+ *destructor = tcf_ct_output_dev_put;
+ }
+ rcu_read_unlock();
+
+ return dev;
+}
+
+static size_t tcf_ct_output_get_fill_size(const struct tc_action *act)
+{
+ return nla_total_size(sizeof(struct tc_ct_output));
+}
+
+static struct tc_action_ops act_ct_output_ops = {
+ .kind = "ct_output",
+ .id = TCA_ID_CT_OUTPUT,
+ .owner = THIS_MODULE,
+ .act = tcf_ct_output_act,
+ .stats_update = tcf_stats_update,
+ .dump = tcf_ct_output_dump,
+ .cleanup = tcf_ct_output_release,
+ .init = tcf_ct_output_init,
+ .walk = tcf_ct_output_walker,
+ .lookup = tcf_ct_output_search,
+ .get_fill_size = tcf_ct_output_get_fill_size,
+ .size = sizeof(struct tcf_ct_output),
+ .get_dev = tcf_ct_output_get_dev,
+};
+
+static __net_init int ct_output_init_net(struct net *net)
+{
+ struct tc_action_net *tn = net_generic(net, ct_output_net_id);
+
+ return tc_action_net_init(net, tn, &act_ct_output_ops);
+}
+
+static void __net_exit ct_output_exit_net(struct list_head *net_list)
+{
+ tc_action_net_exit(net_list, ct_output_net_id);
+}
+
+static struct pernet_operations ct_output_net_ops = {
+ .init = ct_output_init_net,
+ .exit_batch = ct_output_exit_net,
+ .id = &ct_output_net_id,
+ .size = sizeof(struct tc_action_net),
+};
+
+MODULE_AUTHOR("we...@ucloud.cn");
+MODULE_DESCRIPTION("Device output actions for conntracked packets");
+MODULE_LICENSE("GPL");
+
+static int __init ct_output_init_module(void)
+{
+ int err;
+
+ err = register_netdevice_notifier(&ct_output_device_notifier);
+ if (err)
+ return err;
+
+ pr_info("ct_output action on\n");
+ err = tcf_register_action(&act_ct_output_ops, &ct_output_net_ops);
+ if (err)
+ unregister_netdevice_notifier(&ct_output_device_notifier);
+
+ return err;
+}
+
+static void __exit ct_output_cleanup_module(void)
+{
+ tcf_unregister_action(&act_ct_output_ops, &ct_output_net_ops);
+ unregister_netdevice_notifier(&ct_output_device_notifier);
+}
+
+module_init(ct_output_init_module);
+module_exit(ct_output_cleanup_module);
--
1.8.3.1
