diff options
Diffstat (limited to 'net/netfilter/nf_conntrack_labels.c')
| -rw-r--r-- | net/netfilter/nf_conntrack_labels.c | 32 |
1 files changed, 32 insertions, 0 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); } |