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-rw-r--r--net/sched/act_api.c13
-rw-r--r--net/sched/cls_api.c6
-rw-r--r--net/sched/sch_api.c22
-rw-r--r--net/sched/sch_generic.c29
4 files changed, 41 insertions, 29 deletions
diff --git a/net/sched/act_api.c b/net/sched/act_api.c
index 32563cef85bf..2811348f3acc 100644
--- a/net/sched/act_api.c
+++ b/net/sched/act_api.c
@@ -1037,6 +1037,7 @@ int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
restart_act_graph:
for (i = 0; i < nr_actions; i++) {
const struct tc_action *a = actions[i];
+ int repeat_ttl;
if (jmp_prgcnt > 0) {
jmp_prgcnt -= 1;
@@ -1045,11 +1046,17 @@ restart_act_graph:
if (tc_act_skip_sw(a->tcfa_flags))
continue;
+
+ repeat_ttl = 32;
repeat:
ret = a->ops->act(skb, a, res);
- if (ret == TC_ACT_REPEAT)
- goto repeat; /* we need a ttl - JHS */
-
+ if (unlikely(ret == TC_ACT_REPEAT)) {
+ if (--repeat_ttl != 0)
+ goto repeat;
+ /* suspicious opcode, stop pipeline */
+ net_warn_ratelimited("TC_ACT_REPEAT abuse ?\n");
+ return TC_ACT_OK;
+ }
if (TC_ACT_EXT_CMP(ret, TC_ACT_JUMP)) {
jmp_prgcnt = ret & TCA_ACT_MAX_PRIO_MASK;
if (!jmp_prgcnt || (jmp_prgcnt > nr_actions)) {
diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index ff1e6b474fef..2957f8f5cea7 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -1061,7 +1061,7 @@ static int __tcf_qdisc_find(struct net *net, struct Qdisc **q,
/* Find qdisc */
if (!*parent) {
- *q = dev->qdisc;
+ *q = rcu_dereference(dev->qdisc);
*parent = (*q)->handle;
} else {
*q = qdisc_lookup_rcu(dev, TC_H_MAJ(*parent));
@@ -2606,7 +2606,7 @@ static int tc_dump_tfilter(struct sk_buff *skb, struct netlink_callback *cb)
parent = tcm->tcm_parent;
if (!parent)
- q = dev->qdisc;
+ q = rtnl_dereference(dev->qdisc);
else
q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
if (!q)
@@ -2981,7 +2981,7 @@ static int tc_dump_chain(struct sk_buff *skb, struct netlink_callback *cb)
return skb->len;
if (!tcm->tcm_parent)
- q = dev->qdisc;
+ q = rtnl_dereference(dev->qdisc);
else
q = qdisc_lookup(dev, TC_H_MAJ(tcm->tcm_parent));
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index 179825a3b2fd..e3c0e8ea2dbb 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -301,7 +301,7 @@ struct Qdisc *qdisc_lookup(struct net_device *dev, u32 handle)
if (!handle)
return NULL;
- q = qdisc_match_from_root(dev->qdisc, handle);
+ q = qdisc_match_from_root(rtnl_dereference(dev->qdisc), handle);
if (q)
goto out;
@@ -320,7 +320,7 @@ struct Qdisc *qdisc_lookup_rcu(struct net_device *dev, u32 handle)
if (!handle)
return NULL;
- q = qdisc_match_from_root(dev->qdisc, handle);
+ q = qdisc_match_from_root(rcu_dereference(dev->qdisc), handle);
if (q)
goto out;
@@ -1082,10 +1082,10 @@ static int qdisc_graft(struct net_device *dev, struct Qdisc *parent,
skip:
if (!ingress) {
notify_and_destroy(net, skb, n, classid,
- dev->qdisc, new);
+ rtnl_dereference(dev->qdisc), new);
if (new && !new->ops->attach)
qdisc_refcount_inc(new);
- dev->qdisc = new ? : &noop_qdisc;
+ rcu_assign_pointer(dev->qdisc, new ? : &noop_qdisc);
if (new && new->ops->attach)
new->ops->attach(new);
@@ -1451,7 +1451,7 @@ static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n,
q = dev_ingress_queue(dev)->qdisc_sleeping;
}
} else {
- q = dev->qdisc;
+ q = rtnl_dereference(dev->qdisc);
}
if (!q) {
NL_SET_ERR_MSG(extack, "Cannot find specified qdisc on specified device");
@@ -1540,7 +1540,7 @@ replay:
q = dev_ingress_queue(dev)->qdisc_sleeping;
}
} else {
- q = dev->qdisc;
+ q = rtnl_dereference(dev->qdisc);
}
/* It may be default qdisc, ignore it */
@@ -1762,7 +1762,8 @@ static int tc_dump_qdisc(struct sk_buff *skb, struct netlink_callback *cb)
s_q_idx = 0;
q_idx = 0;
- if (tc_dump_qdisc_root(dev->qdisc, skb, cb, &q_idx, s_q_idx,
+ if (tc_dump_qdisc_root(rtnl_dereference(dev->qdisc),
+ skb, cb, &q_idx, s_q_idx,
true, tca[TCA_DUMP_INVISIBLE]) < 0)
goto done;
@@ -2033,7 +2034,7 @@ static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n,
} else if (qid1) {
qid = qid1;
} else if (qid == 0)
- qid = dev->qdisc->handle;
+ qid = rtnl_dereference(dev->qdisc)->handle;
/* Now qid is genuine qdisc handle consistent
* both with parent and child.
@@ -2044,7 +2045,7 @@ static int tc_ctl_tclass(struct sk_buff *skb, struct nlmsghdr *n,
portid = TC_H_MAKE(qid, portid);
} else {
if (qid == 0)
- qid = dev->qdisc->handle;
+ qid = rtnl_dereference(dev->qdisc)->handle;
}
/* OK. Locate qdisc */
@@ -2205,7 +2206,8 @@ static int tc_dump_tclass(struct sk_buff *skb, struct netlink_callback *cb)
s_t = cb->args[0];
t = 0;
- if (tc_dump_tclass_root(dev->qdisc, skb, tcm, cb, &t, s_t, true) < 0)
+ if (tc_dump_tclass_root(rtnl_dereference(dev->qdisc),
+ skb, tcm, cb, &t, s_t, true) < 0)
goto done;
dev_queue = dev_ingress_queue(dev);
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index f893d9a81b01..5bab9f8b8f45 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -1164,30 +1164,33 @@ static void attach_default_qdiscs(struct net_device *dev)
if (!netif_is_multiqueue(dev) ||
dev->priv_flags & IFF_NO_QUEUE) {
netdev_for_each_tx_queue(dev, attach_one_default_qdisc, NULL);
- dev->qdisc = txq->qdisc_sleeping;
- qdisc_refcount_inc(dev->qdisc);
+ qdisc = txq->qdisc_sleeping;
+ rcu_assign_pointer(dev->qdisc, qdisc);
+ qdisc_refcount_inc(qdisc);
} else {
qdisc = qdisc_create_dflt(txq, &mq_qdisc_ops, TC_H_ROOT, NULL);
if (qdisc) {
- dev->qdisc = qdisc;
+ rcu_assign_pointer(dev->qdisc, qdisc);
qdisc->ops->attach(qdisc);
}
}
+ qdisc = rtnl_dereference(dev->qdisc);
/* Detect default qdisc setup/init failed and fallback to "noqueue" */
- if (dev->qdisc == &noop_qdisc) {
+ if (qdisc == &noop_qdisc) {
netdev_warn(dev, "default qdisc (%s) fail, fallback to %s\n",
default_qdisc_ops->id, noqueue_qdisc_ops.id);
dev->priv_flags |= IFF_NO_QUEUE;
netdev_for_each_tx_queue(dev, attach_one_default_qdisc, NULL);
- dev->qdisc = txq->qdisc_sleeping;
- qdisc_refcount_inc(dev->qdisc);
+ qdisc = txq->qdisc_sleeping;
+ rcu_assign_pointer(dev->qdisc, qdisc);
+ qdisc_refcount_inc(qdisc);
dev->priv_flags ^= IFF_NO_QUEUE;
}
#ifdef CONFIG_NET_SCHED
- if (dev->qdisc != &noop_qdisc)
- qdisc_hash_add(dev->qdisc, false);
+ if (qdisc != &noop_qdisc)
+ qdisc_hash_add(qdisc, false);
#endif
}
@@ -1217,7 +1220,7 @@ void dev_activate(struct net_device *dev)
* and noqueue_qdisc for virtual interfaces
*/
- if (dev->qdisc == &noop_qdisc)
+ if (rtnl_dereference(dev->qdisc) == &noop_qdisc)
attach_default_qdiscs(dev);
if (!netif_carrier_ok(dev))
@@ -1383,7 +1386,7 @@ static int qdisc_change_tx_queue_len(struct net_device *dev,
void dev_qdisc_change_real_num_tx(struct net_device *dev,
unsigned int new_real_tx)
{
- struct Qdisc *qdisc = dev->qdisc;
+ struct Qdisc *qdisc = rtnl_dereference(dev->qdisc);
if (qdisc->ops->change_real_num_tx)
qdisc->ops->change_real_num_tx(qdisc, new_real_tx);
@@ -1447,7 +1450,7 @@ static void dev_init_scheduler_queue(struct net_device *dev,
void dev_init_scheduler(struct net_device *dev)
{
- dev->qdisc = &noop_qdisc;
+ rcu_assign_pointer(dev->qdisc, &noop_qdisc);
netdev_for_each_tx_queue(dev, dev_init_scheduler_queue, &noop_qdisc);
if (dev_ingress_queue(dev))
dev_init_scheduler_queue(dev, dev_ingress_queue(dev), &noop_qdisc);
@@ -1475,8 +1478,8 @@ void dev_shutdown(struct net_device *dev)
netdev_for_each_tx_queue(dev, shutdown_scheduler_queue, &noop_qdisc);
if (dev_ingress_queue(dev))
shutdown_scheduler_queue(dev, dev_ingress_queue(dev), &noop_qdisc);
- qdisc_put(dev->qdisc);
- dev->qdisc = &noop_qdisc;
+ qdisc_put(rtnl_dereference(dev->qdisc));
+ rcu_assign_pointer(dev->qdisc, &noop_qdisc);
WARN_ON(timer_pending(&dev->watchdog_timer));
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-25 02:54:54 +0000