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Date: Mon, 5 Feb 2018 19:02:33 +0100
From: Felix Fietkau <nbd@....name>
To: netfilter-devel@...r.kernel.org
Cc: netdev@...r.kernel.org, davem@...emloft.net, pablo@...filter.org
Subject: [PATCH 1/2] 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.
Signed-off-by: Felix Fietkau <nbd@....name>
---
include/net/netfilter/nf_flow_table.h | 2 ++
net/ipv4/netfilter/nf_flow_table_ipv4.c | 1 +
net/ipv6/netfilter/nf_flow_table_ipv6.c | 1 +
net/netfilter/nf_flow_table.c | 15 +++++++++++++++
net/netfilter/nf_flow_table_inet.c | 1 +
net/netfilter/nf_tables_api.c | 8 +-------
6 files changed, 21 insertions(+), 7 deletions(-)
diff --git a/include/net/netfilter/nf_flow_table.h b/include/net/netfilter/nf_flow_table.h
index b22b22082733..67c61bda6a46 100644
--- 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 *table);
const struct rhashtable_params *params;
nf_hookfn *hook;
struct module *owner;
@@ -95,6 +96,7 @@ struct flow_offload_tuple_rhash *flow_offload_lookup(struct nf_flowtable *flow_t
int nf_flow_table_iterate(struct nf_flowtable *flow_table,
void (*iter)(struct flow_offload *flow, void *data),
void *data);
+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;
diff --git a/net/ipv4/netfilter/nf_flow_table_ipv4.c b/net/ipv4/netfilter/nf_flow_table_ipv4.c
index b2d01eb25f2c..25d2975da156 100644
--- 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 flowtable_ipv4 = {
.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,
};
diff --git a/net/ipv6/netfilter/nf_flow_table_ipv6.c b/net/ipv6/netfilter/nf_flow_table_ipv6.c
index fff21602875a..d346705d6ee6 100644
--- a/net/ipv6/netfilter/nf_flow_table_ipv6.c
+++ b/net/ipv6/netfilter/nf_flow_table_ipv6.c
@@ -253,6 +253,7 @@ static struct nf_flowtable_type flowtable_ipv6 = {
.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,
};
diff --git a/net/netfilter/nf_flow_table.c b/net/netfilter/nf_flow_table.c
index 2f5099cb85b8..20f86091ab98 100644
--- a/net/netfilter/nf_flow_table.c
+++ b/net/netfilter/nf_flow_table.c
@@ -221,6 +221,21 @@ int nf_flow_table_iterate(struct nf_flowtable *flow_table,
}
EXPORT_SYMBOL_GPL(nf_flow_table_iterate);
+static void
+__nf_flow_offload_free(struct flow_offload *flow, void *data)
+{
+ struct nf_flowtable *flow_table = data;
+
+ flow_offload_del(flow_table, flow);
+}
+
+void nf_flow_table_free(struct nf_flowtable *flow_table)
+{
+ nf_flow_table_iterate(flow_table, __nf_flow_offload_free, flow_table);
+ rhashtable_destroy(&flow_table->rhashtable);
+}
+EXPORT_SYMBOL_GPL(nf_flow_table_free);
+
static inline bool nf_flow_has_expired(const struct flow_offload *flow)
{
return (__s32)(flow->timeout - (u32)jiffies) <= 0;
diff --git a/net/netfilter/nf_flow_table_inet.c b/net/netfilter/nf_flow_table_inet.c
index 281209aeba8f..375a1881d93d 100644
--- 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 flowtable_inet = {
.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,
};
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 0791813a1e7d..a6c4747c7d5d 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -5399,17 +5399,11 @@ static void nf_tables_flowtable_notify(struct nft_ctx *ctx,
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);
module_put(flowtable->data.type->owner);
}
--
2.14.2
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