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Linux/include/linux/netfilter_ipv6.h

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  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  */
 15 struct ip6_rt_info {
 16         struct in6_addr daddr;
 17         struct in6_addr saddr;
 18         u_int32_t mark;
 19 };
 20 
 21 struct 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  */
 27 struct 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 
 47 extern const struct nf_ipv6_ops __rcu *nf_ipv6_ops;
 48 static inline const struct nf_ipv6_ops *nf_get_ipv6_ops(void)
 49 {
 50         return rcu_dereference(nf_ipv6_ops);
 51 }
 52 
 53 static 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 
 68 int __nf_ip6_route(struct net *net, struct dst_entry **dst,
 69                                struct flowi *fl, bool strict);
 70 
 71 static 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 
 89 int ip6_route_me_harder(struct net *net, struct sk_buff *skb);
 90 __sum16 nf_ip6_checksum(struct sk_buff *skb, unsigned int hook,
 91                         unsigned int dataoff, u_int8_t protocol);
 92 
 93 int ipv6_netfilter_init(void);
 94 void ipv6_netfilter_fini(void);
 95 
 96 #else /* CONFIG_NETFILTER */
 97 static inline int ipv6_netfilter_init(void) { return 0; }
 98 static inline void ipv6_netfilter_fini(void) { return; }
 99 static inline const struct nf_ipv6_ops *nf_get_ipv6_ops(void) { return NULL; }
100 #endif /* CONFIG_NETFILTER */
101 
102 #endif /*__LINUX_IP6_NETFILTER_H*/
103 

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