LXR linux/include/linux/netfilter

   1/* IPv6-specific defines for netfilter. 
   2 * (C)1998 Rusty Russell -- This code is GPL.
   3 * (C)1999 David Jeffery
   4 *   this header was blatantly ripped from netfilter_ipv4.h 
   5 *   it's amazing what adding a bunch of 6s can do =8^)
   6 */
   7#ifndef __LINUX_IP6_NETFILTER_H
   8#define __LINUX_IP6_NETFILTER_H
   9
  10#include <uapi/linux/netfilter_ipv6.h>
  11
  12/* Extra routing may needed on local out, as the QUEUE target never returns
  13 * control to the table.
  14 */
  15struct ip6_rt_info {
  16        struct in6_addr daddr;
  17        struct in6_addr saddr;
  18        u_int32_t mark;
  19};
  20
  21struct nf_queue_entry;
  22
  23/*
  24 * Hook functions for ipv6 to allow xt_* modules to be built-in even
  25 * if IPv6 is a module.
  26 */
  27struct nf_ipv6_ops {
  28#if IS_MODULE(CONFIG_IPV6)
  29        int (*chk_addr)(struct net *net, const struct in6_addr *addr,
  30                        const struct net_device *dev, int strict);
  31        int (*route_me_harder)(struct net *net, struct sk_buff *skb);
  32        int (*dev_get_saddr)(struct net *net, const struct net_device *dev,
  33                       const struct in6_addr *daddr, unsigned int srcprefs,
  34                       struct in6_addr *saddr);
  35        int (*route)(struct net *net, struct dst_entry **dst, struct flowi *fl,
  36                     bool strict);
  37#endif
  38        void (*route_input)(struct sk_buff *skb);
  39        int (*fragment)(struct net *net, struct sock *sk, struct sk_buff *skb,
  40                        int (*output)(struct net *, struct sock *, struct sk_buff *));
  41        int (*reroute)(struct sk_buff *skb, const struct nf_queue_entry *entry);
  42};
  43
  44#ifdef CONFIG_NETFILTER
  45#include <net/addrconf.h>
  46
  47extern const struct nf_ipv6_ops __rcu *nf_ipv6_ops;
  48static inline const struct nf_ipv6_ops *nf_get_ipv6_ops(void)
  49{
  50        return rcu_dereference(nf_ipv6_ops);
  51}
  52
  53static inline int nf_ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
  54                                   const struct net_device *dev, int strict)
  55{
  56#if IS_MODULE(CONFIG_IPV6)
  57        const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops();
  58
  59        if (!v6_ops)
  60                return 1;
  61
  62        return v6_ops->chk_addr(net, addr, dev, strict);
  63#else
  64        return ipv6_chk_addr(net, addr, dev, strict);
  65#endif
  66}
  67
  68int __nf_ip6_route(struct net *net, struct dst_entry **dst,
  69                               struct flowi *fl, bool strict);
  70
  71static inline int nf_ip6_route(struct net *net, struct dst_entry **dst,
  72                               struct flowi *fl, bool strict)
  73{
  74#if IS_MODULE(CONFIG_IPV6)
  75        const struct nf_ipv6_ops *v6ops = nf_get_ipv6_ops();
  76
  77        if (v6ops)
  78                return v6ops->route(net, dst, fl, strict);
  79
  80        return -EHOSTUNREACH;
  81#endif
  82#if IS_BUILTIN(CONFIG_IPV6)
  83        return __nf_ip6_route(net, dst, fl, strict);
  84#else
  85        return -EHOSTUNREACH;
  86#endif
  87}
  88
  89int ip6_route_me_harder(struct net *net, struct sk_buff *skb);
  90
  91static inline int nf_ip6_route_me_harder(struct net *net, struct sk_buff *skb)
  92{
  93#if IS_MODULE(CONFIG_IPV6)
  94        const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops();
  95
  96        if (!v6_ops)
  97                return -EHOSTUNREACH;
  98
  99        return v6_ops->route_me_harder(net, skb);
 100#else
 101        return ip6_route_me_harder(net, skb);
 102#endif
 103}
 104
 105__sum16 nf_ip6_checksum(struct sk_buff *skb, unsigned int hook,
 106                        unsigned int dataoff, u_int8_t protocol);
 107
 108int ipv6_netfilter_init(void);
 109void ipv6_netfilter_fini(void);
 110
 111#else /* CONFIG_NETFILTER */
 112static inline int ipv6_netfilter_init(void) { return 0; }
 113static inline void ipv6_netfilter_fini(void) { return; }
 114static inline const struct nf_ipv6_ops *nf_get_ipv6_ops(void) { return NULL; }
 115#endif /* CONFIG_NETFILTER */
 116
 117#endif /*__LINUX_IP6_NETFILTER_H*/
 118