You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
140 lines
4.4 KiB
140 lines
4.4 KiB
From: Pablo Neira Ayuso <pablo@netfilter.org>
|
|
Date: Mon, 5 Feb 2018 21:44:50 +0100
|
|
Subject: [PATCH] netfilter: nf_tables: fix flowtable free
|
|
|
|
Every flow_offload entry is added into the table twice. Because of this,
|
|
rhashtable_free_and_destroy can't be used, since it would call kfree for
|
|
each flow_offload object twice.
|
|
|
|
This patch adds a call to nf_flow_table_iterate_cleanup() to schedule
|
|
removal of entries, then there is an explicitly invocation of the
|
|
garbage collector to clean up resources.
|
|
|
|
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
|
|
---
|
|
|
|
--- a/include/net/netfilter/nf_flow_table.h
|
|
+++ b/include/net/netfilter/nf_flow_table.h
|
|
@@ -14,6 +14,7 @@ struct nf_flowtable_type {
|
|
struct list_head list;
|
|
int family;
|
|
void (*gc)(struct work_struct *work);
|
|
+ void (*free)(struct nf_flowtable *ft);
|
|
const struct rhashtable_params *params;
|
|
nf_hookfn *hook;
|
|
struct module *owner;
|
|
@@ -98,6 +99,7 @@ int nf_flow_table_iterate(struct nf_flow
|
|
|
|
void nf_flow_table_cleanup(struct net *net, struct net_device *dev);
|
|
|
|
+void nf_flow_table_free(struct nf_flowtable *flow_table);
|
|
void nf_flow_offload_work_gc(struct work_struct *work);
|
|
extern const struct rhashtable_params nf_flow_offload_rhash_params;
|
|
|
|
--- a/net/ipv4/netfilter/nf_flow_table_ipv4.c
|
|
+++ b/net/ipv4/netfilter/nf_flow_table_ipv4.c
|
|
@@ -260,6 +260,7 @@ static struct nf_flowtable_type flowtabl
|
|
.family = NFPROTO_IPV4,
|
|
.params = &nf_flow_offload_rhash_params,
|
|
.gc = nf_flow_offload_work_gc,
|
|
+ .free = nf_flow_table_free,
|
|
.hook = nf_flow_offload_ip_hook,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
--- a/net/ipv6/netfilter/nf_flow_table_ipv6.c
|
|
+++ b/net/ipv6/netfilter/nf_flow_table_ipv6.c
|
|
@@ -254,6 +254,7 @@ static struct nf_flowtable_type flowtabl
|
|
.family = NFPROTO_IPV6,
|
|
.params = &nf_flow_offload_rhash_params,
|
|
.gc = nf_flow_offload_work_gc,
|
|
+ .free = nf_flow_table_free,
|
|
.hook = nf_flow_offload_ipv6_hook,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
--- a/net/netfilter/nf_flow_table.c
|
|
+++ b/net/netfilter/nf_flow_table.c
|
|
@@ -232,19 +232,16 @@ static inline bool nf_flow_is_dying(cons
|
|
return flow->flags & FLOW_OFFLOAD_DYING;
|
|
}
|
|
|
|
-void nf_flow_offload_work_gc(struct work_struct *work)
|
|
+static int nf_flow_offload_gc_step(struct nf_flowtable *flow_table)
|
|
{
|
|
struct flow_offload_tuple_rhash *tuplehash;
|
|
- struct nf_flowtable *flow_table;
|
|
struct rhashtable_iter hti;
|
|
struct flow_offload *flow;
|
|
int err;
|
|
|
|
- flow_table = container_of(work, struct nf_flowtable, gc_work.work);
|
|
-
|
|
err = rhashtable_walk_init(&flow_table->rhashtable, &hti, GFP_KERNEL);
|
|
if (err)
|
|
- goto schedule;
|
|
+ return 0;
|
|
|
|
rhashtable_walk_start(&hti);
|
|
|
|
@@ -270,7 +267,16 @@ void nf_flow_offload_work_gc(struct work
|
|
out:
|
|
rhashtable_walk_stop(&hti);
|
|
rhashtable_walk_exit(&hti);
|
|
-schedule:
|
|
+
|
|
+ return 1;
|
|
+}
|
|
+
|
|
+void nf_flow_offload_work_gc(struct work_struct *work)
|
|
+{
|
|
+ struct nf_flowtable *flow_table;
|
|
+
|
|
+ flow_table = container_of(work, struct nf_flowtable, gc_work.work);
|
|
+ nf_flow_offload_gc_step(flow_table);
|
|
queue_delayed_work(system_power_efficient_wq, &flow_table->gc_work, HZ);
|
|
}
|
|
EXPORT_SYMBOL_GPL(nf_flow_offload_work_gc);
|
|
@@ -449,5 +455,12 @@ void nf_flow_table_cleanup(struct net *n
|
|
}
|
|
EXPORT_SYMBOL_GPL(nf_flow_table_cleanup);
|
|
|
|
+void nf_flow_table_free(struct nf_flowtable *flow_table)
|
|
+{
|
|
+ nf_flow_table_iterate(flow_table, nf_flow_table_do_cleanup, NULL);
|
|
+ WARN_ON(!nf_flow_offload_gc_step(flow_table));
|
|
+}
|
|
+EXPORT_SYMBOL_GPL(nf_flow_table_free);
|
|
+
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
|
|
--- a/net/netfilter/nf_flow_table_inet.c
|
|
+++ b/net/netfilter/nf_flow_table_inet.c
|
|
@@ -24,6 +24,7 @@ static struct nf_flowtable_type flowtabl
|
|
.family = NFPROTO_INET,
|
|
.params = &nf_flow_offload_rhash_params,
|
|
.gc = nf_flow_offload_work_gc,
|
|
+ .free = nf_flow_table_free,
|
|
.hook = nf_flow_offload_inet_hook,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
--- a/net/netfilter/nf_tables_api.c
|
|
+++ b/net/netfilter/nf_tables_api.c
|
|
@@ -5265,17 +5265,12 @@ err:
|
|
nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
|
|
}
|
|
|
|
-static void nft_flowtable_destroy(void *ptr, void *arg)
|
|
-{
|
|
- kfree(ptr);
|
|
-}
|
|
-
|
|
static void nf_tables_flowtable_destroy(struct nft_flowtable *flowtable)
|
|
{
|
|
cancel_delayed_work_sync(&flowtable->data.gc_work);
|
|
kfree(flowtable->name);
|
|
- rhashtable_free_and_destroy(&flowtable->data.rhashtable,
|
|
- nft_flowtable_destroy, NULL);
|
|
+ flowtable->data.type->free(&flowtable->data);
|
|
+ rhashtable_destroy(&flowtable->data.rhashtable);
|
|
module_put(flowtable->data.type->owner);
|
|
}
|
|
|
|
|