aboutsummaryrefslogtreecommitdiffstats
path: root/net
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--net/sched/cls_api.c14
-rw-r--r--net/sched/cls_basic.c6
-rw-r--r--net/sched/cls_bpf.c6
-rw-r--r--net/sched/cls_cgroup.c6
-rw-r--r--net/sched/cls_flow.c6
-rw-r--r--net/sched/cls_fw.c11
-rw-r--r--net/sched/cls_route.c12
-rw-r--r--net/sched/cls_rsvp.h12
-rw-r--r--net/sched/cls_tcindex.c6
-rw-r--r--net/sched/cls_u32.c25
-rw-r--r--net/sched/sch_api.c14
11 files changed, 97 insertions, 21 deletions
diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index baef987fe2c0..8b0470e418dc 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -286,7 +286,7 @@ replay:
RCU_INIT_POINTER(*back, next);
tfilter_notify(net, skb, n, tp, fh, RTM_DELTFILTER);
- tcf_destroy(tp);
+ tcf_destroy(tp, true);
err = 0;
goto errout;
}
@@ -301,14 +301,20 @@ replay:
err = -EEXIST;
if (n->nlmsg_flags & NLM_F_EXCL) {
if (tp_created)
- tcf_destroy(tp);
+ tcf_destroy(tp, true);
goto errout;
}
break;
case RTM_DELTFILTER:
err = tp->ops->delete(tp, fh);
- if (err == 0)
+ if (err == 0) {
tfilter_notify(net, skb, n, tp, fh, RTM_DELTFILTER);
+ if (tcf_destroy(tp, false)) {
+ struct tcf_proto *next = rtnl_dereference(tp->next);
+
+ RCU_INIT_POINTER(*back, next);
+ }
+ }
goto errout;
case RTM_GETTFILTER:
err = tfilter_notify(net, skb, n, tp, fh, RTM_NEWTFILTER);
@@ -329,7 +335,7 @@ replay:
tfilter_notify(net, skb, n, tp, fh, RTM_NEWTFILTER);
} else {
if (tp_created)
- tcf_destroy(tp);
+ tcf_destroy(tp, true);
}
errout:
diff --git a/net/sched/cls_basic.c b/net/sched/cls_basic.c
index fc399db86f11..0b8c3ace671f 100644
--- a/net/sched/cls_basic.c
+++ b/net/sched/cls_basic.c
@@ -96,11 +96,14 @@ static void basic_delete_filter(struct rcu_head *head)
kfree(f);
}
-static void basic_destroy(struct tcf_proto *tp)
+static bool basic_destroy(struct tcf_proto *tp, bool force)
{
struct basic_head *head = rtnl_dereference(tp->root);
struct basic_filter *f, *n;
+ if (!force && !list_empty(&head->flist))
+ return false;
+
list_for_each_entry_safe(f, n, &head->flist, link) {
list_del_rcu(&f->link);
tcf_unbind_filter(tp, &f->res);
@@ -108,6 +111,7 @@ static void basic_destroy(struct tcf_proto *tp)
}
RCU_INIT_POINTER(tp->root, NULL);
kfree_rcu(head, rcu);
+ return true;
}
static int basic_delete(struct tcf_proto *tp, unsigned long arg)
diff --git a/net/sched/cls_bpf.c b/net/sched/cls_bpf.c
index 6f7ed8f8e6ee..243c9f225a73 100644
--- a/net/sched/cls_bpf.c
+++ b/net/sched/cls_bpf.c
@@ -137,11 +137,14 @@ static int cls_bpf_delete(struct tcf_proto *tp, unsigned long arg)
return 0;
}
-static void cls_bpf_destroy(struct tcf_proto *tp)
+static bool cls_bpf_destroy(struct tcf_proto *tp, bool force)
{
struct cls_bpf_head *head = rtnl_dereference(tp->root);
struct cls_bpf_prog *prog, *tmp;
+ if (!force && !list_empty(&head->plist))
+ return false;
+
list_for_each_entry_safe(prog, tmp, &head->plist, link) {
list_del_rcu(&prog->link);
tcf_unbind_filter(tp, &prog->res);
@@ -150,6 +153,7 @@ static void cls_bpf_destroy(struct tcf_proto *tp)
RCU_INIT_POINTER(tp->root, NULL);
kfree_rcu(head, rcu);
+ return true;
}
static unsigned long cls_bpf_get(struct tcf_proto *tp, u32 handle)
diff --git a/net/sched/cls_cgroup.c b/net/sched/cls_cgroup.c
index 221697ab0247..ea611b216412 100644
--- a/net/sched/cls_cgroup.c
+++ b/net/sched/cls_cgroup.c
@@ -143,14 +143,18 @@ errout:
return err;
}
-static void cls_cgroup_destroy(struct tcf_proto *tp)
+static bool cls_cgroup_destroy(struct tcf_proto *tp, bool force)
{
struct cls_cgroup_head *head = rtnl_dereference(tp->root);
+ if (!force)
+ return false;
+
if (head) {
RCU_INIT_POINTER(tp->root, NULL);
call_rcu(&head->rcu, cls_cgroup_destroy_rcu);
}
+ return true;
}
static int cls_cgroup_delete(struct tcf_proto *tp, unsigned long arg)
diff --git a/net/sched/cls_flow.c b/net/sched/cls_flow.c
index 461410394d08..a620c4e288a5 100644
--- a/net/sched/cls_flow.c
+++ b/net/sched/cls_flow.c
@@ -557,17 +557,21 @@ static int flow_init(struct tcf_proto *tp)
return 0;
}
-static void flow_destroy(struct tcf_proto *tp)
+static bool flow_destroy(struct tcf_proto *tp, bool force)
{
struct flow_head *head = rtnl_dereference(tp->root);
struct flow_filter *f, *next;
+ if (!force && !list_empty(&head->filters))
+ return false;
+
list_for_each_entry_safe(f, next, &head->filters, list) {
list_del_rcu(&f->list);
call_rcu(&f->rcu, flow_destroy_filter);
}
RCU_INIT_POINTER(tp->root, NULL);
kfree_rcu(head, rcu);
+ return true;
}
static unsigned long flow_get(struct tcf_proto *tp, u32 handle)
diff --git a/net/sched/cls_fw.c b/net/sched/cls_fw.c
index 9d9aa3e82b10..715e01e5910a 100644
--- a/net/sched/cls_fw.c
+++ b/net/sched/cls_fw.c
@@ -133,14 +133,20 @@ static void fw_delete_filter(struct rcu_head *head)
kfree(f);
}
-static void fw_destroy(struct tcf_proto *tp)
+static bool fw_destroy(struct tcf_proto *tp, bool force)
{
struct fw_head *head = rtnl_dereference(tp->root);
struct fw_filter *f;
int h;
if (head == NULL)
- return;
+ return true;
+
+ if (!force) {
+ for (h = 0; h < HTSIZE; h++)
+ if (rcu_access_pointer(head->ht[h]))
+ return false;
+ }
for (h = 0; h < HTSIZE; h++) {
while ((f = rtnl_dereference(head->ht[h])) != NULL) {
@@ -152,6 +158,7 @@ static void fw_destroy(struct tcf_proto *tp)
}
RCU_INIT_POINTER(tp->root, NULL);
kfree_rcu(head, rcu);
+ return true;
}
static int fw_delete(struct tcf_proto *tp, unsigned long arg)
diff --git a/net/sched/cls_route.c b/net/sched/cls_route.c
index bb8a60235d01..08a3b0a6f5ab 100644
--- a/net/sched/cls_route.c
+++ b/net/sched/cls_route.c
@@ -277,13 +277,20 @@ route4_delete_filter(struct rcu_head *head)
kfree(f);
}
-static void route4_destroy(struct tcf_proto *tp)
+static bool route4_destroy(struct tcf_proto *tp, bool force)
{
struct route4_head *head = rtnl_dereference(tp->root);
int h1, h2;
if (head == NULL)
- return;
+ return true;
+
+ if (!force) {
+ for (h1 = 0; h1 <= 256; h1++) {
+ if (rcu_access_pointer(head->table[h1]))
+ return false;
+ }
+ }
for (h1 = 0; h1 <= 256; h1++) {
struct route4_bucket *b;
@@ -308,6 +315,7 @@ static void route4_destroy(struct tcf_proto *tp)
}
RCU_INIT_POINTER(tp->root, NULL);
kfree_rcu(head, rcu);
+ return true;
}
static int route4_delete(struct tcf_proto *tp, unsigned long arg)
diff --git a/net/sched/cls_rsvp.h b/net/sched/cls_rsvp.h
index edd8ade3fbc1..02fa82792dab 100644
--- a/net/sched/cls_rsvp.h
+++ b/net/sched/cls_rsvp.h
@@ -291,13 +291,20 @@ rsvp_delete_filter(struct tcf_proto *tp, struct rsvp_filter *f)
kfree_rcu(f, rcu);
}
-static void rsvp_destroy(struct tcf_proto *tp)
+static bool rsvp_destroy(struct tcf_proto *tp, bool force)
{
struct rsvp_head *data = rtnl_dereference(tp->root);
int h1, h2;
if (data == NULL)
- return;
+ return true;
+
+ if (!force) {
+ for (h1 = 0; h1 < 256; h1++) {
+ if (rcu_access_pointer(data->ht[h1]))
+ return false;
+ }
+ }
RCU_INIT_POINTER(tp->root, NULL);
@@ -319,6 +326,7 @@ static void rsvp_destroy(struct tcf_proto *tp)
}
}
kfree_rcu(data, rcu);
+ return true;
}
static int rsvp_delete(struct tcf_proto *tp, unsigned long arg)
diff --git a/net/sched/cls_tcindex.c b/net/sched/cls_tcindex.c
index bd49bf547a47..a557dbaf5afe 100644
--- a/net/sched/cls_tcindex.c
+++ b/net/sched/cls_tcindex.c
@@ -468,11 +468,14 @@ static void tcindex_walk(struct tcf_proto *tp, struct tcf_walker *walker)
}
}
-static void tcindex_destroy(struct tcf_proto *tp)
+static bool tcindex_destroy(struct tcf_proto *tp, bool force)
{
struct tcindex_data *p = rtnl_dereference(tp->root);
struct tcf_walker walker;
+ if (!force)
+ return false;
+
pr_debug("tcindex_destroy(tp %p),p %p\n", tp, p);
walker.count = 0;
walker.skip = 0;
@@ -481,6 +484,7 @@ static void tcindex_destroy(struct tcf_proto *tp)
RCU_INIT_POINTER(tp->root, NULL);
call_rcu(&p->rcu, __tcindex_destroy);
+ return true;
}
diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c
index 09487afbfd51..375e51b71c80 100644
--- a/net/sched/cls_u32.c
+++ b/net/sched/cls_u32.c
@@ -460,13 +460,35 @@ static int u32_destroy_hnode(struct tcf_proto *tp, struct tc_u_hnode *ht)
return -ENOENT;
}
-static void u32_destroy(struct tcf_proto *tp)
+static bool ht_empty(struct tc_u_hnode *ht)
+{
+ unsigned int h;
+
+ for (h = 0; h <= ht->divisor; h++)
+ if (rcu_access_pointer(ht->ht[h]))
+ return false;
+
+ return true;
+}
+
+static bool u32_destroy(struct tcf_proto *tp, bool force)
{
struct tc_u_common *tp_c = tp->data;
struct tc_u_hnode *root_ht = rtnl_dereference(tp->root);
WARN_ON(root_ht == NULL);
+ if (!force) {
+ if (root_ht) {
+ if (root_ht->refcnt > 1)
+ return false;
+ if (root_ht->refcnt == 1) {
+ if (!ht_empty(root_ht))
+ return false;
+ }
+ }
+ }
+
if (root_ht && --root_ht->refcnt == 0)
u32_destroy_hnode(tp, root_ht);
@@ -491,6 +513,7 @@ static void u32_destroy(struct tcf_proto *tp)
}
tp->data = NULL;
+ return true;
}
static int u32_delete(struct tcf_proto *tp, unsigned long arg)
diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index 243b7d169d61..ad9eed70bc8f 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -1858,11 +1858,15 @@ reclassify:
}
EXPORT_SYMBOL(tc_classify);
-void tcf_destroy(struct tcf_proto *tp)
+bool tcf_destroy(struct tcf_proto *tp, bool force)
{
- tp->ops->destroy(tp);
- module_put(tp->ops->owner);
- kfree_rcu(tp, rcu);
+ if (tp->ops->destroy(tp, force)) {
+ module_put(tp->ops->owner);
+ kfree_rcu(tp, rcu);
+ return true;
+ }
+
+ return false;
}
void tcf_destroy_chain(struct tcf_proto __rcu **fl)
@@ -1871,7 +1875,7 @@ void tcf_destroy_chain(struct tcf_proto __rcu **fl)
while ((tp = rtnl_dereference(*fl)) != NULL) {
RCU_INIT_POINTER(*fl, tp->next);
- tcf_destroy(tp);
+ tcf_destroy(tp, true);
}
}
EXPORT_SYMBOL(tcf_destroy_chain);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.