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authorFlorian Westphal <fw@strlen.de>2017-12-01 00:21:04 +0100
committerPablo Neira Ayuso <pablo@netfilter.org>2018-01-08 18:01:07 +0100
commit8c873e2199700c2de7dbd5eedb9d90d5f109462b (patch)
tree7c7a2d4d7853659a19a36a725767871351a7aedf /net/netfilter/core.c
parentnetfilter: core: remove synchronize_net call if nfqueue is used (diff)
downloadlinux-dev-8c873e2199700c2de7dbd5eedb9d90d5f109462b.tar.xz
linux-dev-8c873e2199700c2de7dbd5eedb9d90d5f109462b.zip
netfilter: core: free hooks with call_rcu
Giuseppe Scrivano says: "SELinux, if enabled, registers for each new network namespace 6 netfilter hooks." Cost for this is high. With synchronize_net() removed: "The net benefit on an SMP machine with two cores is that creating a new network namespace takes -40% of the original time." This patch replaces synchronize_net+kvfree with call_rcu(). We store rcu_head at the tail of a structure that has no fixed layout, i.e. we cannot use offsetof() to compute the start of the original allocation. Thus store this information right after the rcu head. We could simplify this by just placing the rcu_head at the start of struct nf_hook_entries. However, this structure is used in packet processing hotpath, so only place what is needed for that at the beginning of the struct. Reported-by: Giuseppe Scrivano <gscrivan@redhat.com> Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/netfilter/core.c')
-rw-r--r--net/netfilter/core.c34
1 files changed, 28 insertions, 6 deletions
diff --git a/net/netfilter/core.c b/net/netfilter/core.c
index 9a84b6cb99e6..6921f9f1cc81 100644
--- a/net/netfilter/core.c
+++ b/net/netfilter/core.c
@@ -74,7 +74,8 @@ static struct nf_hook_entries *allocate_hook_entries_size(u16 num)
struct nf_hook_entries *e;
size_t alloc = sizeof(*e) +
sizeof(struct nf_hook_entry) * num +
- sizeof(struct nf_hook_ops *) * num;
+ sizeof(struct nf_hook_ops *) * num +
+ sizeof(struct nf_hook_entries_rcu_head);
if (num == 0)
return NULL;
@@ -85,6 +86,30 @@ static struct nf_hook_entries *allocate_hook_entries_size(u16 num)
return e;
}
+static void __nf_hook_entries_free(struct rcu_head *h)
+{
+ struct nf_hook_entries_rcu_head *head;
+
+ head = container_of(h, struct nf_hook_entries_rcu_head, head);
+ kvfree(head->allocation);
+}
+
+static void nf_hook_entries_free(struct nf_hook_entries *e)
+{
+ struct nf_hook_entries_rcu_head *head;
+ struct nf_hook_ops **ops;
+ unsigned int num;
+
+ if (!e)
+ return;
+
+ num = e->num_hook_entries;
+ ops = nf_hook_entries_get_hook_ops(e);
+ head = (void *)&ops[num];
+ head->allocation = e;
+ call_rcu(&head->head, __nf_hook_entries_free);
+}
+
static unsigned int accept_all(void *priv,
struct sk_buff *skb,
const struct nf_hook_state *state)
@@ -291,9 +316,8 @@ int nf_register_net_hook(struct net *net, const struct nf_hook_ops *reg)
#ifdef HAVE_JUMP_LABEL
static_key_slow_inc(&nf_hooks_needed[reg->pf][reg->hooknum]);
#endif
- synchronize_net();
BUG_ON(p == new_hooks);
- kvfree(p);
+ nf_hook_entries_free(p);
return 0;
}
EXPORT_SYMBOL(nf_register_net_hook);
@@ -361,10 +385,8 @@ void nf_unregister_net_hook(struct net *net, const struct nf_hook_ops *reg)
if (!p)
return;
- synchronize_net();
-
nf_queue_nf_hook_drop(net);
- kvfree(p);
+ nf_hook_entries_free(p);
}
EXPORT_SYMBOL(nf_unregister_net_hook);