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Diffstat (limited to 'net/sched/act_mirred.c')
-rw-r--r--net/sched/act_mirred.c150
1 files changed, 97 insertions, 53 deletions
diff --git a/net/sched/act_mirred.c b/net/sched/act_mirred.c
index 1ad300e6dbc0..b8ad6ae282c0 100644
--- a/net/sched/act_mirred.c
+++ b/net/sched/act_mirred.c
@@ -19,6 +19,7 @@
#include <linux/if_arp.h>
#include <net/net_namespace.h>
#include <net/netlink.h>
+#include <net/dst.h>
#include <net/pkt_sched.h>
#include <net/pkt_cls.h>
#include <linux/tc_act/tc_mirred.h>
@@ -78,30 +79,27 @@ static void tcf_mirred_release(struct tc_action *a)
/* last reference to action, no need to lock */
dev = rcu_dereference_protected(m->tcfm_dev, 1);
- if (dev)
- dev_put(dev);
+ netdev_put(dev, &m->tcfm_dev_tracker);
}
static const struct nla_policy mirred_policy[TCA_MIRRED_MAX + 1] = {
[TCA_MIRRED_PARMS] = { .len = sizeof(struct tc_mirred) },
};
-static unsigned int mirred_net_id;
static struct tc_action_ops act_mirred_ops;
static int tcf_mirred_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, mirred_net_id);
+ struct tc_action_net *tn = net_generic(net, act_mirred_ops.net_id);
+ bool bind = flags & TCA_ACT_FLAGS_BIND;
struct nlattr *tb[TCA_MIRRED_MAX + 1];
struct tcf_chain *goto_ch = NULL;
bool mac_header_xmit = false;
struct tc_mirred *parm;
struct tcf_mirred *m;
- struct net_device *dev;
bool exists = false;
int ret, err;
u32 index;
@@ -155,7 +153,7 @@ static int tcf_mirred_init(struct net *net, struct nlattr *nla,
return ret;
}
ret = ACT_P_CREATED;
- } else if (!ovr) {
+ } else if (!(flags & TCA_ACT_FLAGS_REPLACE)) {
tcf_idr_release(*a, bind);
return -EEXIST;
}
@@ -171,17 +169,19 @@ static int tcf_mirred_init(struct net *net, struct nlattr *nla,
spin_lock_bh(&m->tcf_lock);
if (parm->ifindex) {
- dev = dev_get_by_index(net, parm->ifindex);
- if (!dev) {
+ struct net_device *odev, *ndev;
+
+ ndev = dev_get_by_index(net, parm->ifindex);
+ if (!ndev) {
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,
+ mac_header_xmit = dev_is_mac_header_xmit(ndev);
+ odev = rcu_replace_pointer(m->tcfm_dev, ndev,
lockdep_is_held(&m->tcf_lock));
- if (dev)
- dev_put(dev);
+ netdev_put(odev, &m->tcfm_dev_tracker);
+ netdev_tracker_alloc(ndev, &m->tcfm_dev_tracker, GFP_ATOMIC);
m->tcfm_mac_header_xmit = mac_header_xmit;
}
goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
@@ -194,8 +194,6 @@ static int tcf_mirred_init(struct net *net, struct nlattr *nla,
spin_lock(&mirred_list_lock);
list_add(&m->tcfm_list, &mirred_list);
spin_unlock(&mirred_list_lock);
-
- tcf_idr_insert(tn, *a);
}
return ret;
@@ -207,6 +205,18 @@ release_idr:
return err;
}
+static int tcf_mirred_forward(bool want_ingress, struct sk_buff *skb)
+{
+ int err;
+
+ if (!want_ingress)
+ err = tcf_dev_queue_xmit(skb, dev_queue_xmit);
+ else
+ err = netif_receive_skb(skb);
+
+ return err;
+}
+
static int tcf_mirred_act(struct sk_buff *skb, const struct tc_action *a,
struct tcf_result *res)
{
@@ -220,6 +230,7 @@ static int tcf_mirred_act(struct sk_buff *skb, const struct tc_action *a,
bool want_ingress;
bool is_redirect;
bool expects_nh;
+ bool at_ingress;
int m_eaction;
int mac_len;
bool at_nh;
@@ -255,7 +266,8 @@ static int tcf_mirred_act(struct sk_buff *skb, const struct tc_action *a,
* ingress - that covers the TC S/W datapath.
*/
is_redirect = tcf_mirred_is_act_redirect(m_eaction);
- use_reinsert = skb_at_tc_ingress(skb) && is_redirect &&
+ at_ingress = skb_at_tc_ingress(skb);
+ use_reinsert = at_ingress && is_redirect &&
tcf_mirred_can_reinsert(retval);
if (!use_reinsert) {
skb2 = skb_clone(skb, GFP_ATOMIC);
@@ -265,6 +277,11 @@ static int tcf_mirred_act(struct sk_buff *skb, const struct tc_action *a,
want_ingress = tcf_mirred_act_wants_ingress(m_eaction);
+ /* All mirred/redirected skbs should clear previous ct info */
+ nf_reset_ct(skb2);
+ if (want_ingress && !at_ingress) /* drop dst for egress -> ingress */
+ skb_dst_drop(skb2);
+
expects_nh = want_ingress || !m_mac_header_xmit;
at_nh = skb->data == skb_network_header(skb);
if (at_nh != expects_nh) {
@@ -284,25 +301,19 @@ static int tcf_mirred_act(struct sk_buff *skb, const struct tc_action *a,
/* mirror is always swallowed */
if (is_redirect) {
- skb2->tc_redirected = 1;
- skb2->tc_from_ingress = skb2->tc_at_ingress;
- if (skb2->tc_from_ingress)
- skb2->tstamp = 0;
+ skb_set_redirected(skb2, skb2->tc_at_ingress);
+
/* let's the caller reinsert the packet, if possible */
if (use_reinsert) {
- res->ingress = want_ingress;
- if (skb_tc_reinsert(skb, res))
+ err = tcf_mirred_forward(want_ingress, skb);
+ if (err)
tcf_action_inc_overlimit_qstats(&m->common);
__this_cpu_dec(mirred_rec_level);
return TC_ACT_CONSUMED;
}
}
- if (!want_ingress)
- err = dev_queue_xmit(skb2);
- else
- err = netif_receive_skb(skb2);
-
+ err = tcf_mirred_forward(want_ingress, skb2);
if (err) {
out:
tcf_action_inc_overlimit_qstats(&m->common);
@@ -314,13 +325,13 @@ out:
return retval;
}
-static void tcf_stats_update(struct tc_action *a, u64 bytes, u32 packets,
- u64 lastuse, bool hw)
+static void tcf_stats_update(struct tc_action *a, u64 bytes, u64 packets,
+ u64 drops, u64 lastuse, bool hw)
{
struct tcf_mirred *m = to_mirred(a);
struct tcf_t *tm = &m->tcf_tm;
- tcf_action_update_stats(a, bytes, packets, false, hw);
+ tcf_action_update_stats(a, bytes, packets, drops, hw);
tm->lastuse = max_t(u64, tm->lastuse, lastuse);
}
@@ -360,23 +371,6 @@ nla_put_failure:
return -1;
}
-static int tcf_mirred_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, mirred_net_id);
-
- return tcf_generic_walker(tn, skb, cb, type, ops, extack);
-}
-
-static int tcf_mirred_search(struct net *net, struct tc_action **a, u32 index)
-{
- struct tc_action_net *tn = net_generic(net, mirred_net_id);
-
- return tcf_idr_search(tn, a, index);
-}
-
static int mirred_device_event(struct notifier_block *unused,
unsigned long event, void *ptr)
{
@@ -389,7 +383,7 @@ static int mirred_device_event(struct notifier_block *unused,
list_for_each_entry(m, &mirred_list, tcfm_list) {
spin_lock_bh(&m->tcf_lock);
if (tcf_mirred_dev_dereference(m) == dev) {
- dev_put(dev);
+ netdev_put(dev, &m->tcfm_dev_tracker);
/* Note : no rcu grace period necessary, as
* net_device are already rcu protected.
*/
@@ -437,6 +431,57 @@ static size_t tcf_mirred_get_fill_size(const struct tc_action *act)
return nla_total_size(sizeof(struct tc_mirred));
}
+static void tcf_offload_mirred_get_dev(struct flow_action_entry *entry,
+ const struct tc_action *act)
+{
+ entry->dev = act->ops->get_dev(act, &entry->destructor);
+ if (!entry->dev)
+ return;
+ entry->destructor_priv = entry->dev;
+}
+
+static int tcf_mirred_offload_act_setup(struct tc_action *act, void *entry_data,
+ u32 *index_inc, bool bind,
+ struct netlink_ext_ack *extack)
+{
+ if (bind) {
+ struct flow_action_entry *entry = entry_data;
+
+ if (is_tcf_mirred_egress_redirect(act)) {
+ entry->id = FLOW_ACTION_REDIRECT;
+ tcf_offload_mirred_get_dev(entry, act);
+ } else if (is_tcf_mirred_egress_mirror(act)) {
+ entry->id = FLOW_ACTION_MIRRED;
+ tcf_offload_mirred_get_dev(entry, act);
+ } else if (is_tcf_mirred_ingress_redirect(act)) {
+ entry->id = FLOW_ACTION_REDIRECT_INGRESS;
+ tcf_offload_mirred_get_dev(entry, act);
+ } else if (is_tcf_mirred_ingress_mirror(act)) {
+ entry->id = FLOW_ACTION_MIRRED_INGRESS;
+ tcf_offload_mirred_get_dev(entry, act);
+ } else {
+ NL_SET_ERR_MSG_MOD(extack, "Unsupported mirred offload");
+ return -EOPNOTSUPP;
+ }
+ *index_inc = 1;
+ } else {
+ struct flow_offload_action *fl_action = entry_data;
+
+ if (is_tcf_mirred_egress_redirect(act))
+ fl_action->id = FLOW_ACTION_REDIRECT;
+ else if (is_tcf_mirred_egress_mirror(act))
+ fl_action->id = FLOW_ACTION_MIRRED;
+ else if (is_tcf_mirred_ingress_redirect(act))
+ fl_action->id = FLOW_ACTION_REDIRECT_INGRESS;
+ else if (is_tcf_mirred_ingress_mirror(act))
+ fl_action->id = FLOW_ACTION_MIRRED_INGRESS;
+ else
+ return -EOPNOTSUPP;
+ }
+
+ return 0;
+}
+
static struct tc_action_ops act_mirred_ops = {
.kind = "mirred",
.id = TCA_ID_MIRRED,
@@ -446,29 +491,28 @@ static struct tc_action_ops act_mirred_ops = {
.dump = tcf_mirred_dump,
.cleanup = tcf_mirred_release,
.init = tcf_mirred_init,
- .walk = tcf_mirred_walker,
- .lookup = tcf_mirred_search,
.get_fill_size = tcf_mirred_get_fill_size,
+ .offload_act_setup = tcf_mirred_offload_act_setup,
.size = sizeof(struct tcf_mirred),
.get_dev = tcf_mirred_get_dev,
};
static __net_init int mirred_init_net(struct net *net)
{
- struct tc_action_net *tn = net_generic(net, mirred_net_id);
+ struct tc_action_net *tn = net_generic(net, act_mirred_ops.net_id);
return tc_action_net_init(net, tn, &act_mirred_ops);
}
static void __net_exit mirred_exit_net(struct list_head *net_list)
{
- tc_action_net_exit(net_list, mirred_net_id);
+ tc_action_net_exit(net_list, act_mirred_ops.net_id);
}
static struct pernet_operations mirred_net_ops = {
.init = mirred_init_net,
.exit_batch = mirred_exit_net,
- .id = &mirred_net_id,
+ .id = &act_mirred_ops.net_id,
.size = sizeof(struct tc_action_net),
};
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.