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authorJoe Stringer <joestringer@nicira.com>2015-08-26 11:31:51 -0700
committerDavid S. Miller <davem@davemloft.net>2015-08-27 11:40:43 -0700
commit86ca02e77408bb58ba596c1a411ec7f631733690 (patch)
tree47c49fb6c16f6ea00844e48f9c7a8c9739d88334 /net/netfilter
parent55e5713f2b5cefed98e3674017e994d688e47b85 (diff)
netfilter: connlabels: Export setting connlabel length
Add functions to change connlabel length into nf_conntrack_labels.c so they may be reused by other modules like OVS and nftables without needing to jump through xt_match_check() hoops. Suggested-by: Florian Westphal <fw@strlen.de> Signed-off-by: Joe Stringer <joestringer@nicira.com> Acked-by: Florian Westphal <fw@strlen.de> Acked-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/netfilter')
-rw-r--r--net/netfilter/nf_conntrack_labels.c32
-rw-r--r--net/netfilter/xt_connlabel.c16
2 files changed, 36 insertions, 12 deletions
diff --git a/net/netfilter/nf_conntrack_labels.c b/net/netfilter/nf_conntrack_labels.c
index daa7c1383bec..3ce5c314ea4b 100644
--- a/net/netfilter/nf_conntrack_labels.c
+++ b/net/netfilter/nf_conntrack_labels.c
@@ -14,6 +14,8 @@
#include <net/netfilter/nf_conntrack_ecache.h>
#include <net/netfilter/nf_conntrack_labels.h>
+static spinlock_t nf_connlabels_lock;
+
static unsigned int label_bits(const struct nf_conn_labels *l)
{
unsigned int longs = l->words;
@@ -89,6 +91,35 @@ int nf_connlabels_replace(struct nf_conn *ct,
}
EXPORT_SYMBOL_GPL(nf_connlabels_replace);
+int nf_connlabels_get(struct net *net, unsigned int n_bits)
+{
+ size_t words;
+
+ if (n_bits > (NF_CT_LABELS_MAX_SIZE * BITS_PER_BYTE))
+ return -ERANGE;
+
+ words = BITS_TO_LONGS(n_bits);
+
+ spin_lock(&nf_connlabels_lock);
+ net->ct.labels_used++;
+ if (words > net->ct.label_words)
+ net->ct.label_words = words;
+ spin_unlock(&nf_connlabels_lock);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(nf_connlabels_get);
+
+void nf_connlabels_put(struct net *net)
+{
+ spin_lock(&nf_connlabels_lock);
+ net->ct.labels_used--;
+ if (net->ct.labels_used == 0)
+ net->ct.label_words = 0;
+ spin_unlock(&nf_connlabels_lock);
+}
+EXPORT_SYMBOL_GPL(nf_connlabels_put);
+
static struct nf_ct_ext_type labels_extend __read_mostly = {
.len = sizeof(struct nf_conn_labels),
.align = __alignof__(struct nf_conn_labels),
@@ -97,6 +128,7 @@ static struct nf_ct_ext_type labels_extend __read_mostly = {
int nf_conntrack_labels_init(void)
{
+ spin_lock_init(&nf_connlabels_lock);
return nf_ct_extend_register(&labels_extend);
}
diff --git a/net/netfilter/xt_connlabel.c b/net/netfilter/xt_connlabel.c
index 9f8719df2001..bb9cbeb18868 100644
--- a/net/netfilter/xt_connlabel.c
+++ b/net/netfilter/xt_connlabel.c
@@ -42,10 +42,6 @@ static int connlabel_mt_check(const struct xt_mtchk_param *par)
XT_CONNLABEL_OP_SET;
struct xt_connlabel_mtinfo *info = par->matchinfo;
int ret;
- size_t words;
-
- if (info->bit > XT_CONNLABEL_MAXBIT)
- return -ERANGE;
if (info->options & ~options) {
pr_err("Unknown options in mask %x\n", info->options);
@@ -59,19 +55,15 @@ static int connlabel_mt_check(const struct xt_mtchk_param *par)
return ret;
}
- par->net->ct.labels_used++;
- words = BITS_TO_LONGS(info->bit+1);
- if (words > par->net->ct.label_words)
- par->net->ct.label_words = words;
-
+ ret = nf_connlabels_get(par->net, info->bit + 1);
+ if (ret < 0)
+ nf_ct_l3proto_module_put(par->family);
return ret;
}
static void connlabel_mt_destroy(const struct xt_mtdtor_param *par)
{
- par->net->ct.labels_used--;
- if (par->net->ct.labels_used == 0)
- par->net->ct.label_words = 0;
+ nf_connlabels_put(par->net);
nf_ct_l3proto_module_put(par->family);
}

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