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 /* Check for an extension */ 14 static inline int 15 nf_ip6_ext_hdr(u8 nexthdr) 16 { return (nexthdr == IPPROTO_HOPOPTS) || 17 (nexthdr == IPPROTO_ROUTING) || 18 (nexthdr == IPPROTO_FRAGMENT) || 19 (nexthdr == IPPROTO_ESP) || 20 (nexthdr == IPPROTO_AH) || 21 (nexthdr == IPPROTO_NONE) || 22 (nexthdr == IPPROTO_DSTOPTS); 23 } 24 25 /* Extra routing may needed on local out, as the QUEUE target never returns 26 * control to the table. 27 */ 28 struct ip6_rt_info { 29 struct in6_addr daddr; 30 struct in6_addr saddr; 31 u_int32_t mark; 32 }; 33 34 struct nf_queue_entry; 35 struct nf_bridge_frag_data; 36 37 /* 38 * Hook functions for ipv6 to allow xt_* modules to be built-in even 39 * if IPv6 is a module. 40 */ 41 struct nf_ipv6_ops { 42 #if IS_MODULE(CONFIG_IPV6) 43 int (*chk_addr)(struct net *net, const struct in6_addr *addr, 44 const struct net_device *dev, int strict); 45 int (*route_me_harder)(struct net *net, struct sk_buff *skb); 46 int (*dev_get_saddr)(struct net *net, const struct net_device *dev, 47 const struct in6_addr *daddr, unsigned int srcprefs, 48 struct in6_addr *saddr); 49 int (*route)(struct net *net, struct dst_entry **dst, struct flowi *fl, 50 bool strict); 51 u32 (*cookie_init_sequence)(const struct ipv6hdr *iph, 52 const struct tcphdr *th, u16 *mssp); 53 int (*cookie_v6_check)(const struct ipv6hdr *iph, 54 const struct tcphdr *th, __u32 cookie); 55 #endif 56 void (*route_input)(struct sk_buff *skb); 57 int (*fragment)(struct net *net, struct sock *sk, struct sk_buff *skb, 58 int (*output)(struct net *, struct sock *, struct sk_buff *)); 59 int (*reroute)(struct sk_buff *skb, const struct nf_queue_entry *entry); 60 #if IS_MODULE(CONFIG_IPV6) 61 int (*br_defrag)(struct net *net, struct sk_buff *skb, u32 user); 62 int (*br_fragment)(struct net *net, struct sock *sk, 63 struct sk_buff *skb, 64 struct nf_bridge_frag_data *data, 65 int (*output)(struct net *, struct sock *sk, 66 const struct nf_bridge_frag_data *data, 67 struct sk_buff *)); 68 #endif 69 }; 70 71 #ifdef CONFIG_NETFILTER 72 #include <net/addrconf.h> 73 74 extern const struct nf_ipv6_ops __rcu *nf_ipv6_ops; 75 static inline const struct nf_ipv6_ops *nf_get_ipv6_ops(void) 76 { 77 return rcu_dereference(nf_ipv6_ops); 78 } 79 80 static inline int nf_ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 81 const struct net_device *dev, int strict) 82 { 83 #if IS_MODULE(CONFIG_IPV6) 84 const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops(); 85 86 if (!v6_ops) 87 return 1; 88 89 return v6_ops->chk_addr(net, addr, dev, strict); 90 #elif IS_BUILTIN(CONFIG_IPV6) 91 return ipv6_chk_addr(net, addr, dev, strict); 92 #else 93 return 1; 94 #endif 95 } 96 97 int __nf_ip6_route(struct net *net, struct dst_entry **dst, 98 struct flowi *fl, bool strict); 99 100 static inline int nf_ip6_route(struct net *net, struct dst_entry **dst, 101 struct flowi *fl, bool strict) 102 { 103 #if IS_MODULE(CONFIG_IPV6) 104 const struct nf_ipv6_ops *v6ops = nf_get_ipv6_ops(); 105 106 if (v6ops) 107 return v6ops->route(net, dst, fl, strict); 108 109 return -EHOSTUNREACH; 110 #endif 111 #if IS_BUILTIN(CONFIG_IPV6) 112 return __nf_ip6_route(net, dst, fl, strict); 113 #else 114 return -EHOSTUNREACH; 115 #endif 116 } 117 118 #include <net/netfilter/ipv6/nf_defrag_ipv6.h> 119 120 static inline int nf_ipv6_br_defrag(struct net *net, struct sk_buff *skb, 121 u32 user) 122 { 123 #if IS_MODULE(CONFIG_IPV6) 124 const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops(); 125 126 if (!v6_ops) 127 return 1; 128 129 return v6_ops->br_defrag(net, skb, user); 130 #elif IS_BUILTIN(CONFIG_IPV6) 131 return nf_ct_frag6_gather(net, skb, user); 132 #else 133 return 1; 134 #endif 135 } 136 137 int br_ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, 138 struct nf_bridge_frag_data *data, 139 int (*output)(struct net *, struct sock *sk, 140 const struct nf_bridge_frag_data *data, 141 struct sk_buff *)); 142 143 static inline int nf_br_ip6_fragment(struct net *net, struct sock *sk, 144 struct sk_buff *skb, 145 struct nf_bridge_frag_data *data, 146 int (*output)(struct net *, struct sock *sk, 147 const struct nf_bridge_frag_data *data, 148 struct sk_buff *)) 149 { 150 #if IS_MODULE(CONFIG_IPV6) 151 const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops(); 152 153 if (!v6_ops) 154 return 1; 155 156 return v6_ops->br_fragment(net, sk, skb, data, output); 157 #elif IS_BUILTIN(CONFIG_IPV6) 158 return br_ip6_fragment(net, sk, skb, data, output); 159 #else 160 return 1; 161 #endif 162 } 163 164 int ip6_route_me_harder(struct net *net, struct sk_buff *skb); 165 166 static inline int nf_ip6_route_me_harder(struct net *net, struct sk_buff *skb) 167 { 168 #if IS_MODULE(CONFIG_IPV6) 169 const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops(); 170 171 if (!v6_ops) 172 return -EHOSTUNREACH; 173 174 return v6_ops->route_me_harder(net, skb); 175 #elif IS_BUILTIN(CONFIG_IPV6) 176 return ip6_route_me_harder(net, skb); 177 #else 178 return -EHOSTUNREACH; 179 #endif 180 } 181 182 static inline u32 nf_ipv6_cookie_init_sequence(const struct ipv6hdr *iph, 183 const struct tcphdr *th, 184 u16 *mssp) 185 { 186 #if IS_ENABLED(CONFIG_SYN_COOKIES) 187 #if IS_MODULE(CONFIG_IPV6) 188 const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops(); 189 190 if (v6_ops) 191 return v6_ops->cookie_init_sequence(iph, th, mssp); 192 #elif IS_BUILTIN(CONFIG_IPV6) 193 return __cookie_v6_init_sequence(iph, th, mssp); 194 #endif 195 #endif 196 return 0; 197 } 198 199 static inline int nf_cookie_v6_check(const struct ipv6hdr *iph, 200 const struct tcphdr *th, __u32 cookie) 201 { 202 #if IS_ENABLED(CONFIG_SYN_COOKIES) 203 #if IS_MODULE(CONFIG_IPV6) 204 const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops(); 205 206 if (v6_ops) 207 return v6_ops->cookie_v6_check(iph, th, cookie); 208 #elif IS_BUILTIN(CONFIG_IPV6) 209 return __cookie_v6_check(iph, th, cookie); 210 #endif 211 #endif 212 return 0; 213 } 214 215 __sum16 nf_ip6_checksum(struct sk_buff *skb, unsigned int hook, 216 unsigned int dataoff, u_int8_t protocol); 217 218 int ipv6_netfilter_init(void); 219 void ipv6_netfilter_fini(void); 220 221 #else /* CONFIG_NETFILTER */ 222 static inline int ipv6_netfilter_init(void) { return 0; } 223 static inline void ipv6_netfilter_fini(void) { return; } 224 static inline const struct nf_ipv6_ops *nf_get_ipv6_ops(void) { return NULL; } 225 #endif /* CONFIG_NETFILTER */ 226 227 #endif /*__LINUX_IP6_NETFILTER_H*/ 228