/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _IPV6_STUBS_H
#define _IPV6_STUBS_H

#include <linux/in6.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <net/dst.h>
#include <net/flow.h>
#include <net/neighbour.h>
#include <net/sock.h>
#include <net/ipv6.h>

/* structs from net/ip6_fib.h */
struct fib6_info;
struct fib6_nh;
struct fib6_config;
struct fib6_result;

/* This is ugly, ideally these symbols should be built
 * into the core kernel.
 */
struct ipv6_stub {
        int (*ipv6_sock_mc_join)(struct sock *sk, int ifindex,
                                 const struct in6_addr *addr);
        int (*ipv6_sock_mc_drop)(struct sock *sk, int ifindex,
                                 const struct in6_addr *addr);
        struct dst_entry *(*ipv6_dst_lookup_flow)(struct net *net,
                                                  const struct sock *sk,
                                                  struct flowi6 *fl6,
                                                  const struct in6_addr *final_dst);
        int (*ipv6_route_input)(struct sk_buff *skb);

        struct fib6_table *(*fib6_get_table)(struct net *net, u32 id);
        int (*fib6_lookup)(struct net *net, int oif, struct flowi6 *fl6,
                           struct fib6_result *res, int flags);
        int (*fib6_table_lookup)(struct net *net, struct fib6_table *table,
                                 int oif, struct flowi6 *fl6,
                                 struct fib6_result *res, int flags);
        void (*fib6_select_path)(const struct net *net, struct fib6_result *res,
                                 struct flowi6 *fl6, int oif, bool oif_match,
                                 const struct sk_buff *skb, int strict);
        u32 (*ip6_mtu_from_fib6)(const struct fib6_result *res,
                                 const struct in6_addr *daddr,
                                 const struct in6_addr *saddr);

        int (*fib6_nh_init)(struct net *net, struct fib6_nh *fib6_nh,
                            struct fib6_config *cfg, gfp_t gfp_flags,
                            struct netlink_ext_ack *extack);
        void (*fib6_nh_release)(struct fib6_nh *fib6_nh);
        void (*fib6_nh_release_dsts)(struct fib6_nh *fib6_nh);
        void (*fib6_update_sernum)(struct net *net, struct fib6_info *rt);
        int (*ip6_del_rt)(struct net *net, struct fib6_info *rt, bool skip_notify);
        void (*fib6_rt_update)(struct net *net, struct fib6_info *rt,
                               struct nl_info *info);

        void (*udpv6_encap_enable)(void);
        void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr *daddr,
                              const struct in6_addr *solicited_addr,
                              bool router, bool solicited, bool override, bool inc_opt);
#if IS_ENABLED(CONFIG_XFRM)
        void (*xfrm6_local_rxpmtu)(struct sk_buff *skb, u32 mtu);
        int (*xfrm6_udp_encap_rcv)(struct sock *sk, struct sk_buff *skb);
        struct sk_buff *(*xfrm6_gro_udp_encap_rcv)(struct sock *sk,
                                                   struct list_head *head,
                                                   struct sk_buff *skb);
        int (*xfrm6_rcv_encap)(struct sk_buff *skb, int nexthdr, __be32 spi,
                               int encap_type);
#endif
        struct neigh_table *nd_tbl;

        int (*ipv6_fragment)(struct net *net, struct sock *sk, struct sk_buff *skb,
                             int (*output)(struct net *, struct sock *, struct sk_buff *));
        struct net_device *(*ipv6_dev_find)(struct net *net, const struct in6_addr *addr,
                                            struct net_device *dev);
        int (*ip6_xmit)(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
                        __u32 mark, struct ipv6_txoptions *opt, int tclass, u32 priority);
};
extern const struct ipv6_stub *ipv6_stub __read_mostly;

/* A stub used by bpf helpers. Similarly ugly as ipv6_stub */
struct ipv6_bpf_stub {
        int (*inet6_bind)(struct sock *sk, struct sockaddr_unsized *uaddr, int addr_len,
                          u32 flags);
        struct sock *(*udp6_lib_lookup)(const struct net *net,
                                     const struct in6_addr *saddr, __be16 sport,
                                     const struct in6_addr *daddr, __be16 dport,
                                     int dif, int sdif, struct udp_table *tbl,
                                     struct sk_buff *skb);
        int (*ipv6_setsockopt)(struct sock *sk, int level, int optname,
                               sockptr_t optval, unsigned int optlen);
        int (*ipv6_getsockopt)(struct sock *sk, int level, int optname,
                               sockptr_t optval, sockptr_t optlen);
        int (*ipv6_dev_get_saddr)(struct net *net,
                                  const struct net_device *dst_dev,
                                  const struct in6_addr *daddr,
                                  unsigned int prefs,
                                  struct in6_addr *saddr);
};
extern const struct ipv6_bpf_stub *ipv6_bpf_stub __read_mostly;

#endif