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 struct nf_ct_bridge_frag_data; 23 24 /* 25 * Hook functions for ipv6 to allow xt_* modules to be built-in even 26 * if IPv6 is a module. 27 */ 28 struct nf_ipv6_ops { 29 #if IS_MODULE(CONFIG_IPV6) 30 int (*chk_addr)(struct net *net, const struct in6_addr *addr, 31 const struct net_device *dev, int strict); 32 int (*route_me_harder)(struct net *net, struct sk_buff *skb); 33 int (*dev_get_saddr)(struct net *net, const struct net_device *dev, 34 const struct in6_addr *daddr, unsigned int srcprefs, 35 struct in6_addr *saddr); 36 int (*route)(struct net *net, struct dst_entry **dst, struct flowi *fl, 37 bool strict); 38 #endif 39 void (*route_input)(struct sk_buff *skb); 40 int (*fragment)(struct net *net, struct sock *sk, struct sk_buff *skb, 41 int (*output)(struct net *, struct sock *, struct sk_buff *)); 42 int (*reroute)(struct sk_buff *skb, const struct nf_queue_entry *entry); 43 #if IS_MODULE(CONFIG_IPV6) 44 int (*br_defrag)(struct net *net, struct sk_buff *skb, u32 user); 45 int (*br_fragment)(struct net *net, struct sock *sk, 46 struct sk_buff *skb, 47 struct nf_ct_bridge_frag_data *data, 48 int (*output)(struct net *, struct sock *sk, 49 const struct nf_ct_bridge_frag_data *data, 50 struct sk_buff *)); 51 #endif 52 }; 53 54 #ifdef CONFIG_NETFILTER 55 #include <net/addrconf.h> 56 57 extern const struct nf_ipv6_ops __rcu *nf_ipv6_ops; 58 static inline const struct nf_ipv6_ops *nf_get_ipv6_ops(void) 59 { 60 return rcu_dereference(nf_ipv6_ops); 61 } 62 63 static inline int nf_ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 64 const struct net_device *dev, int strict) 65 { 66 #if IS_MODULE(CONFIG_IPV6) 67 const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops(); 68 69 if (!v6_ops) 70 return 1; 71 72 return v6_ops->chk_addr(net, addr, dev, strict); 73 #else 74 return ipv6_chk_addr(net, addr, dev, strict); 75 #endif 76 } 77 78 int __nf_ip6_route(struct net *net, struct dst_entry **dst, 79 struct flowi *fl, bool strict); 80 81 static inline int nf_ip6_route(struct net *net, struct dst_entry **dst, 82 struct flowi *fl, bool strict) 83 { 84 #if IS_MODULE(CONFIG_IPV6) 85 const struct nf_ipv6_ops *v6ops = nf_get_ipv6_ops(); 86 87 if (v6ops) 88 return v6ops->route(net, dst, fl, strict); 89 90 return -EHOSTUNREACH; 91 #endif 92 #if IS_BUILTIN(CONFIG_IPV6) 93 return __nf_ip6_route(net, dst, fl, strict); 94 #else 95 return -EHOSTUNREACH; 96 #endif 97 } 98 99 #include <net/netfilter/ipv6/nf_defrag_ipv6.h> 100 101 static inline int nf_ipv6_br_defrag(struct net *net, struct sk_buff *skb, 102 u32 user) 103 { 104 #if IS_MODULE(CONFIG_IPV6) 105 const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops(); 106 107 if (!v6_ops) 108 return 1; 109 110 return v6_ops->br_defrag(net, skb, user); 111 #else 112 return nf_ct_frag6_gather(net, skb, user); 113 #endif 114 } 115 116 int br_ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, 117 struct nf_ct_bridge_frag_data *data, 118 int (*output)(struct net *, struct sock *sk, 119 const struct nf_ct_bridge_frag_data *data, 120 struct sk_buff *)); 121 122 static inline int nf_br_ip6_fragment(struct net *net, struct sock *sk, 123 struct sk_buff *skb, 124 struct nf_ct_bridge_frag_data *data, 125 int (*output)(struct net *, struct sock *sk, 126 const struct nf_ct_bridge_frag_data *data, 127 struct sk_buff *)) 128 { 129 #if IS_MODULE(CONFIG_IPV6) 130 const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops(); 131 132 if (!v6_ops) 133 return 1; 134 135 return v6_ops->br_fragment(net, sk, skb, data, output); 136 #else 137 return br_ip6_fragment(net, sk, skb, data, output); 138 #endif 139 } 140 141 int ip6_route_me_harder(struct net *net, struct sk_buff *skb); 142 143 static inline int nf_ip6_route_me_harder(struct net *net, struct sk_buff *skb) 144 { 145 #if IS_MODULE(CONFIG_IPV6) 146 const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops(); 147 148 if (!v6_ops) 149 return -EHOSTUNREACH; 150 151 return v6_ops->route_me_harder(net, skb); 152 #else 153 return ip6_route_me_harder(net, skb); 154 #endif 155 } 156 157 __sum16 nf_ip6_checksum(struct sk_buff *skb, unsigned int hook, 158 unsigned int dataoff, u_int8_t protocol); 159 160 int ipv6_netfilter_init(void); 161 void ipv6_netfilter_fini(void); 162 163 #else /* CONFIG_NETFILTER */ 164 static inline int ipv6_netfilter_init(void) { return 0; } 165 static inline void ipv6_netfilter_fini(void) { return; } 166 static inline const struct nf_ipv6_ops *nf_get_ipv6_ops(void) { return NULL; } 167 #endif /* CONFIG_NETFILTER */ 168 169 #endif /*__LINUX_IP6_NETFILTER_H*/ 170