diff options
| -rw-r--r-- | net/mpls/af_mpls.c | 57 | ||||
| -rw-r--r-- | net/mpls/internal.h | 3 |
2 files changed, 60 insertions, 0 deletions
diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c index e432f092f2fb..2d6612a10e30 100644 --- a/net/mpls/af_mpls.c +++ b/net/mpls/af_mpls.c @@ -410,6 +410,63 @@ static struct notifier_block mpls_dev_notifier = { .notifier_call = mpls_dev_notify, }; +int nla_put_labels(struct sk_buff *skb, int attrtype, + u8 labels, const u32 label[]) +{ + struct nlattr *nla; + struct mpls_shim_hdr *nla_label; + bool bos; + int i; + nla = nla_reserve(skb, attrtype, labels*4); + if (!nla) + return -EMSGSIZE; + + nla_label = nla_data(nla); + bos = true; + for (i = labels - 1; i >= 0; i--) { + nla_label[i] = mpls_entry_encode(label[i], 0, 0, bos); + bos = false; + } + + return 0; +} + +int nla_get_labels(const struct nlattr *nla, + u32 max_labels, u32 *labels, u32 label[]) +{ + unsigned len = nla_len(nla); + unsigned nla_labels; + struct mpls_shim_hdr *nla_label; + bool bos; + int i; + + /* len needs to be an even multiple of 4 (the label size) */ + if (len & 3) + return -EINVAL; + + /* Limit the number of new labels allowed */ + nla_labels = len/4; + if (nla_labels > max_labels) + return -EINVAL; + + nla_label = nla_data(nla); + bos = true; + for (i = nla_labels - 1; i >= 0; i--, bos = false) { + struct mpls_entry_decoded dec; + dec = mpls_entry_decode(nla_label + i); + + /* Ensure the bottom of stack flag is properly set + * and ttl and tc are both clear. + */ + if ((dec.bos != bos) || dec.ttl || dec.tc) + return -EINVAL; + + label[i] = dec.label; + } + *labels = nla_labels; + return 0; +} + static int resize_platform_label_table(struct net *net, size_t limit) { size_t size = sizeof(struct mpls_route *) * limit; diff --git a/net/mpls/internal.h b/net/mpls/internal.h index c2944cb84d48..fb6de92052c4 100644 --- a/net/mpls/internal.h +++ b/net/mpls/internal.h @@ -53,4 +53,7 @@ static inline struct mpls_entry_decoded mpls_entry_decode(struct mpls_shim_hdr * return result; } +int nla_put_labels(struct sk_buff *skb, int attrtype, u8 labels, const u32 label[]); +int nla_get_labels(const struct nlattr *nla, u32 max_labels, u32 *labels, u32 label[]); + #endif /* MPLS_INTERNAL_H */ |