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 */ 14static inline int 15nf_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 */ 28struct ip6_rt_info { 29 struct in6_addr daddr; 30 struct in6_addr saddr; 31 u_int32_t mark; 32}; 33 34struct nf_queue_entry; 35struct 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 */ 41struct 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 sock *sk, 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); 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_fragment)(struct net *net, struct sock *sk, 62 struct sk_buff *skb, 63 struct nf_bridge_frag_data *data, 64 int (*output)(struct net *, struct sock *sk, 65 const struct nf_bridge_frag_data *data, 66 struct sk_buff *)); 67#endif 68}; 69 70#ifdef CONFIG_NETFILTER 71#include <net/addrconf.h> 72 73extern const struct nf_ipv6_ops __rcu *nf_ipv6_ops; 74static inline const struct nf_ipv6_ops *nf_get_ipv6_ops(void) 75{ 76 return rcu_dereference(nf_ipv6_ops); 77} 78 79static inline int nf_ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 80 const struct net_device *dev, int strict) 81{ 82#if IS_MODULE(CONFIG_IPV6) 83 const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops(); 84 85 if (!v6_ops) 86 return 1; 87 88 return v6_ops->chk_addr(net, addr, dev, strict); 89#elif IS_BUILTIN(CONFIG_IPV6) 90 return ipv6_chk_addr(net, addr, dev, strict); 91#else 92 return 1; 93#endif 94} 95 96int __nf_ip6_route(struct net *net, struct dst_entry **dst, 97 struct flowi *fl, bool strict); 98 99static inline int nf_ip6_route(struct net *net, struct dst_entry **dst, 100 struct flowi *fl, bool strict) 101{ 102#if IS_MODULE(CONFIG_IPV6) 103 const struct nf_ipv6_ops *v6ops = nf_get_ipv6_ops(); 104 105 if (v6ops) 106 return v6ops->route(net, dst, fl, strict); 107 108 return -EHOSTUNREACH; 109#endif 110#if IS_BUILTIN(CONFIG_IPV6) 111 return __nf_ip6_route(net, dst, fl, strict); 112#else 113 return -EHOSTUNREACH; 114#endif 115} 116 117#include <net/netfilter/ipv6/nf_defrag_ipv6.h> 118 119int br_ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, 120 struct nf_bridge_frag_data *data, 121 int (*output)(struct net *, struct sock *sk, 122 const struct nf_bridge_frag_data *data, 123 struct sk_buff *)); 124 125static inline int nf_br_ip6_fragment(struct net *net, struct sock *sk, 126 struct sk_buff *skb, 127 struct nf_bridge_frag_data *data, 128 int (*output)(struct net *, struct sock *sk, 129 const struct nf_bridge_frag_data *data, 130 struct sk_buff *)) 131{ 132#if IS_MODULE(CONFIG_IPV6) 133 const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops(); 134 135 if (!v6_ops) 136 return 1; 137 138 return v6_ops->br_fragment(net, sk, skb, data, output); 139#elif IS_BUILTIN(CONFIG_IPV6) 140 return br_ip6_fragment(net, sk, skb, data, output); 141#else 142 return 1; 143#endif 144} 145 146int ip6_route_me_harder(struct net *net, struct sock *sk, struct sk_buff *skb); 147 148static inline int nf_ip6_route_me_harder(struct net *net, struct sock *sk, struct sk_buff *skb) 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 -EHOSTUNREACH; 155 156 return v6_ops->route_me_harder(net, sk, skb); 157#elif IS_BUILTIN(CONFIG_IPV6) 158 return ip6_route_me_harder(net, sk, skb); 159#else 160 return -EHOSTUNREACH; 161#endif 162} 163 164static inline u32 nf_ipv6_cookie_init_sequence(const struct ipv6hdr *iph, 165 const struct tcphdr *th, 166 u16 *mssp) 167{ 168#if IS_ENABLED(CONFIG_SYN_COOKIES) 169#if IS_MODULE(CONFIG_IPV6) 170 const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops(); 171 172 if (v6_ops) 173 return v6_ops->cookie_init_sequence(iph, th, mssp); 174#elif IS_BUILTIN(CONFIG_IPV6) 175 return __cookie_v6_init_sequence(iph, th, mssp); 176#endif 177#endif 178 return 0; 179} 180 181static inline int nf_cookie_v6_check(const struct ipv6hdr *iph, 182 const struct tcphdr *th) 183{ 184#if IS_ENABLED(CONFIG_SYN_COOKIES) 185#if IS_MODULE(CONFIG_IPV6) 186 const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops(); 187 188 if (v6_ops) 189 return v6_ops->cookie_v6_check(iph, th); 190#elif IS_BUILTIN(CONFIG_IPV6) 191 return __cookie_v6_check(iph, th); 192#endif 193#endif 194 return 0; 195} 196 197__sum16 nf_ip6_checksum(struct sk_buff *skb, unsigned int hook, 198 unsigned int dataoff, u_int8_t protocol); 199 200int nf_ip6_check_hbh_len(struct sk_buff *skb, u32 *plen); 201 202int ipv6_netfilter_init(void); 203void ipv6_netfilter_fini(void); 204 205#else /* CONFIG_NETFILTER */ 206static inline int ipv6_netfilter_init(void) { return 0; } 207static inline void ipv6_netfilter_fini(void) { return; } 208static inline const struct nf_ipv6_ops *nf_get_ipv6_ops(void) { return NULL; } 209#endif /* CONFIG_NETFILTER */ 210 211#endif /*__LINUX_IP6_NETFILTER_H*/ 212