+void __ndisc_fill_addr_option(struct sk_buff *skb, int type, void *data,
+ int data_len, int pad);
+
+#define NDISC_OPS_REDIRECT_DATA_SPACE 2
+
+/*
+ * This structure defines the hooks for IPv6 neighbour discovery.
+ * The following hooks can be defined; unless noted otherwise, they are
+ * optional and can be filled with a null pointer.
+ *
+ * int (*is_useropt)(u8 nd_opt_type):
+ * This function is called when IPv6 decide RA userspace options. if
+ * this function returns 1 then the option given by nd_opt_type will
+ * be handled as userspace option additional to the IPv6 options.
+ *
+ * int (*parse_options)(const struct net_device *dev,
+ * struct nd_opt_hdr *nd_opt,
+ * struct ndisc_options *ndopts):
+ * This function is called while parsing ndisc ops and put each position
+ * as pointer into ndopts. If this function return unequal 0, then this
+ * function took care about the ndisc option, if 0 then the IPv6 ndisc
+ * option parser will take care about that option.
+ *
+ * void (*update)(const struct net_device *dev, struct neighbour *n,
+ * u32 flags, u8 icmp6_type,
+ * const struct ndisc_options *ndopts):
+ * This function is called when IPv6 ndisc updates the neighbour cache
+ * entry. Additional options which can be updated may be previously
+ * parsed by parse_opts callback and accessible over ndopts parameter.
+ *
+ * int (*opt_addr_space)(const struct net_device *dev, u8 icmp6_type,
+ * struct neighbour *neigh, u8 *ha_buf,
+ * u8 **ha):
+ * This function is called when the necessary option space will be
+ * calculated before allocating a skb. The parameters neigh, ha_buf
+ * abd ha are available on NDISC_REDIRECT messages only.
+ *
+ * void (*fill_addr_option)(const struct net_device *dev,
+ * struct sk_buff *skb, u8 icmp6_type,
+ * const u8 *ha):
+ * This function is called when the skb will finally fill the option
+ * fields inside skb. NOTE: this callback should fill the option
+ * fields to the skb which are previously indicated by opt_space
+ * parameter. That means the decision to add such option should
+ * not lost between these two callbacks, e.g. protected by interface
+ * up state.
+ *
+ * void (*prefix_rcv_add_addr)(struct net *net, struct net_device *dev,
+ * const struct prefix_info *pinfo,
+ * struct inet6_dev *in6_dev,
+ * struct in6_addr *addr,
+ * int addr_type, u32 addr_flags,
+ * bool sllao, bool tokenized,
+ * __u32 valid_lft, u32 prefered_lft,
+ * bool dev_addr_generated):
+ * This function is called when a RA messages is received with valid
+ * PIO option fields and an IPv6 address will be added to the interface
+ * for autoconfiguration. The parameter dev_addr_generated reports about
+ * if the address was based on dev->dev_addr or not. This can be used
+ * to add a second address if link-layer operates with two link layer
+ * addresses. E.g. 802.15.4 6LoWPAN.
+ */
+struct ndisc_ops {
+ int (*is_useropt)(u8 nd_opt_type);
+ int (*parse_options)(const struct net_device *dev,
+ struct nd_opt_hdr *nd_opt,
+ struct ndisc_options *ndopts);
+ void (*update)(const struct net_device *dev, struct neighbour *n,
+ u32 flags, u8 icmp6_type,
+ const struct ndisc_options *ndopts);
+ int (*opt_addr_space)(const struct net_device *dev, u8 icmp6_type,
+ struct neighbour *neigh, u8 *ha_buf,
+ u8 **ha);
+ void (*fill_addr_option)(const struct net_device *dev,
+ struct sk_buff *skb, u8 icmp6_type,
+ const u8 *ha);
+ void (*prefix_rcv_add_addr)(struct net *net, struct net_device *dev,
+ const struct prefix_info *pinfo,
+ struct inet6_dev *in6_dev,
+ struct in6_addr *addr,
+ int addr_type, u32 addr_flags,
+ bool sllao, bool tokenized,
+ __u32 valid_lft, u32 prefered_lft,
+ bool dev_addr_generated);
+};
+
+#if IS_ENABLED(CONFIG_IPV6)
+static inline int ndisc_ops_is_useropt(const struct net_device *dev,
+ u8 nd_opt_type)
+{
+ if (dev->ndisc_ops && dev->ndisc_ops->is_useropt)
+ return dev->ndisc_ops->is_useropt(nd_opt_type);
+ else
+ return 0;
+}
+
+static inline int ndisc_ops_parse_options(const struct net_device *dev,
+ struct nd_opt_hdr *nd_opt,
+ struct ndisc_options *ndopts)
+{
+ if (dev->ndisc_ops && dev->ndisc_ops->parse_options)
+ return dev->ndisc_ops->parse_options(dev, nd_opt, ndopts);
+ else
+ return 0;
+}
+
+static inline void ndisc_ops_update(const struct net_device *dev,
+ struct neighbour *n, u32 flags,
+ u8 icmp6_type,
+ const struct ndisc_options *ndopts)
+{
+ if (dev->ndisc_ops && dev->ndisc_ops->update)
+ dev->ndisc_ops->update(dev, n, flags, icmp6_type, ndopts);
+}
+
+static inline int ndisc_ops_opt_addr_space(const struct net_device *dev,
+ u8 icmp6_type)
+{
+ if (dev->ndisc_ops && dev->ndisc_ops->opt_addr_space &&
+ icmp6_type != NDISC_REDIRECT)
+ return dev->ndisc_ops->opt_addr_space(dev, icmp6_type, NULL,
+ NULL, NULL);
+ else
+ return 0;
+}
+
+static inline int ndisc_ops_redirect_opt_addr_space(const struct net_device *dev,
+ struct neighbour *neigh,
+ u8 *ha_buf, u8 **ha)
+{
+ if (dev->ndisc_ops && dev->ndisc_ops->opt_addr_space)
+ return dev->ndisc_ops->opt_addr_space(dev, NDISC_REDIRECT,
+ neigh, ha_buf, ha);
+ else
+ return 0;
+}
+
+static inline void ndisc_ops_fill_addr_option(const struct net_device *dev,
+ struct sk_buff *skb,
+ u8 icmp6_type)
+{
+ if (dev->ndisc_ops && dev->ndisc_ops->fill_addr_option &&
+ icmp6_type != NDISC_REDIRECT)
+ dev->ndisc_ops->fill_addr_option(dev, skb, icmp6_type, NULL);
+}
+
+static inline void ndisc_ops_fill_redirect_addr_option(const struct net_device *dev,
+ struct sk_buff *skb,
+ const u8 *ha)
+{
+ if (dev->ndisc_ops && dev->ndisc_ops->fill_addr_option)
+ dev->ndisc_ops->fill_addr_option(dev, skb, NDISC_REDIRECT, ha);
+}
+
+static inline void ndisc_ops_prefix_rcv_add_addr(struct net *net,
+ struct net_device *dev,
+ const struct prefix_info *pinfo,
+ struct inet6_dev *in6_dev,
+ struct in6_addr *addr,
+ int addr_type, u32 addr_flags,
+ bool sllao, bool tokenized,
+ __u32 valid_lft,
+ u32 prefered_lft,
+ bool dev_addr_generated)
+{
+ if (dev->ndisc_ops && dev->ndisc_ops->prefix_rcv_add_addr)
+ dev->ndisc_ops->prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
+ addr, addr_type,
+ addr_flags, sllao,
+ tokenized, valid_lft,
+ prefered_lft,
+ dev_addr_generated);
+}
+#endif
+