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 #include <net/tcp.h> 12 13 /* Extra routing may needed on local out, as the QUEUE target never returns 14 * control to the table. 15 */ 16 struct ip6_rt_info { 17 struct in6_addr daddr; 18 struct in6_addr saddr; 19 u_int32_t mark; 20 }; 21 22 struct nf_queue_entry; 23 struct nf_ct_bridge_frag_data; 24 25 /* 26 * Hook functions for ipv6 to allow xt_* modules to be built-in even 27 * if IPv6 is a module. 28 */ 29 struct nf_ipv6_ops { 30 #if IS_MODULE(CONFIG_IPV6) 31 int (*chk_addr)(struct net *net, const struct in6_addr *addr, 32 const struct net_device *dev, int strict); 33 int (*route_me_harder)(struct net *net, struct sk_buff *skb); 34 int (*dev_get_saddr)(struct net *net, const struct net_device *dev, 35 const struct in6_addr *daddr, unsigned int srcprefs, 36 struct in6_addr *saddr); 37 int (*route)(struct net *net, struct dst_entry **dst, struct flowi *fl, 38 bool strict); 39 u32 (*cookie_init_sequence)(const struct ipv6hdr *iph, 40 const struct tcphdr *th, u16 *mssp); 41 int (*cookie_v6_check)(const struct ipv6hdr *iph, 42 const struct tcphdr *th, __u32 cookie); 43 #endif 44 void (*route_input)(struct sk_buff *skb); 45 int (*fragment)(struct net *net, struct sock *sk, struct sk_buff *skb, 46 int (*output)(struct net *, struct sock *, struct sk_buff *)); 47 int (*reroute)(struct sk_buff *skb, const struct nf_queue_entry *entry); 48 #if IS_MODULE(CONFIG_IPV6) 49 int (*br_defrag)(struct net *net, struct sk_buff *skb, u32 user); 50 int (*br_fragment)(struct net *net, struct sock *sk, 51 struct sk_buff *skb, 52 struct nf_ct_bridge_frag_data *data, 53 int (*output)(struct net *, struct sock *sk, 54 const struct nf_ct_bridge_frag_data *data, 55 struct sk_buff *)); 56 #endif 57 }; 58 59 #ifdef CONFIG_NETFILTER 60 #include <net/addrconf.h> 61 62 extern const struct nf_ipv6_ops __rcu *nf_ipv6_ops; 63 static inline const struct nf_ipv6_ops *nf_get_ipv6_ops(void) 64 { 65 return rcu_dereference(nf_ipv6_ops); 66 } 67 68 static inline int nf_ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 69 const struct net_device *dev, int strict) 70 { 71 #if IS_MODULE(CONFIG_IPV6) 72 const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops(); 73 74 if (!v6_ops) 75 return 1; 76 77 return v6_ops->chk_addr(net, addr, dev, strict); 78 #elif IS_BUILTIN(CONFIG_IPV6) 79 return ipv6_chk_addr(net, addr, dev, strict); 80 #else 81 return 1; 82 #endif 83 } 84 85 int __nf_ip6_route(struct net *net, struct dst_entry **dst, 86 struct flowi *fl, bool strict); 87 88 static inline int nf_ip6_route(struct net *net, struct dst_entry **dst, 89 struct flowi *fl, bool strict) 90 { 91 #if IS_MODULE(CONFIG_IPV6) 92 const struct nf_ipv6_ops *v6ops = nf_get_ipv6_ops(); 93 94 if (v6ops) 95 return v6ops->route(net, dst, fl, strict); 96 97 return -EHOSTUNREACH; 98 #endif 99 #if IS_BUILTIN(CONFIG_IPV6) 100 return __nf_ip6_route(net, dst, fl, strict); 101 #else 102 return -EHOSTUNREACH; 103 #endif 104 } 105 106 #include <net/netfilter/ipv6/nf_defrag_ipv6.h> 107 108 static inline int nf_ipv6_br_defrag(struct net *net, struct sk_buff *skb, 109 u32 user) 110 { 111 #if IS_MODULE(CONFIG_IPV6) 112 const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops(); 113 114 if (!v6_ops) 115 return 1; 116 117 return v6_ops->br_defrag(net, skb, user); 118 #elif IS_BUILTIN(CONFIG_IPV6) 119 return nf_ct_frag6_gather(net, skb, user); 120 #else 121 return 1; 122 #endif 123 } 124 125 int br_ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, 126 struct nf_ct_bridge_frag_data *data, 127 int (*output)(struct net *, struct sock *sk, 128 const struct nf_ct_bridge_frag_data *data, 129 struct sk_buff *)); 130 131 static inline int nf_br_ip6_fragment(struct net *net, struct sock *sk, 132 struct sk_buff *skb, 133 struct nf_ct_bridge_frag_data *data, 134 int (*output)(struct net *, struct sock *sk, 135 const struct nf_ct_bridge_frag_data *data, 136 struct sk_buff *)) 137 { 138 #if IS_MODULE(CONFIG_IPV6) 139 const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops(); 140 141 if (!v6_ops) 142 return 1; 143 144 return v6_ops->br_fragment(net, sk, skb, data, output); 145 #elif IS_BUILTIN(CONFIG_IPV6) 146 return br_ip6_fragment(net, sk, skb, data, output); 147 #else 148 return 1; 149 #endif 150 } 151 152 int ip6_route_me_harder(struct net *net, struct sk_buff *skb); 153 154 static inline int nf_ip6_route_me_harder(struct net *net, struct sk_buff *skb) 155 { 156 #if IS_MODULE(CONFIG_IPV6) 157 const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops(); 158 159 if (!v6_ops) 160 return -EHOSTUNREACH; 161 162 return v6_ops->route_me_harder(net, skb); 163 #elif IS_BUILTIN(CONFIG_IPV6) 164 return ip6_route_me_harder(net, skb); 165 #else 166 return -EHOSTUNREACH; 167 #endif 168 } 169 170 static inline u32 nf_ipv6_cookie_init_sequence(const struct ipv6hdr *iph, 171 const struct tcphdr *th, 172 u16 *mssp) 173 { 174 #if IS_ENABLED(CONFIG_SYN_COOKIES) 175 #if IS_MODULE(CONFIG_IPV6) 176 const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops(); 177 178 if (v6_ops) 179 return v6_ops->cookie_init_sequence(iph, th, mssp); 180 #elif IS_BUILTIN(CONFIG_IPV6) 181 return __cookie_v6_init_sequence(iph, th, mssp); 182 #endif 183 #endif 184 return 0; 185 } 186 187 static inline int nf_cookie_v6_check(const struct ipv6hdr *iph, 188 const struct tcphdr *th, __u32 cookie) 189 { 190 #if IS_ENABLED(CONFIG_SYN_COOKIES) 191 #if IS_MODULE(CONFIG_IPV6) 192 const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops(); 193 194 if (v6_ops) 195 return v6_ops->cookie_v6_check(iph, th, cookie); 196 #elif IS_BUILTIN(CONFIG_IPV6) 197 return __cookie_v6_check(iph, th, cookie); 198 #endif 199 #endif 200 return 0; 201 } 202 203 __sum16 nf_ip6_checksum(struct sk_buff *skb, unsigned int hook, 204 unsigned int dataoff, u_int8_t protocol); 205 206 int ipv6_netfilter_init(void); 207 void ipv6_netfilter_fini(void); 208 209 #else /* CONFIG_NETFILTER */ 210 static inline int ipv6_netfilter_init(void) { return 0; } 211 static inline void ipv6_netfilter_fini(void) { return; } 212 static inline const struct nf_ipv6_ops *nf_get_ipv6_ops(void) { return NULL; } 213 #endif /* CONFIG_NETFILTER */ 214 215 #endif /*__LINUX_IP6_NETFILTER_H*/ 216