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TOMOYO Linux Cross Reference
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 #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 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, __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_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 
 73 extern const struct nf_ipv6_ops __rcu *nf_ipv6_ops;
 74 static inline const struct nf_ipv6_ops *nf_get_ipv6_ops(void)
 75 {
 76         return rcu_dereference(nf_ipv6_ops);
 77 }
 78 
 79 static 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 
 96 int __nf_ip6_route(struct net *net, struct dst_entry **dst,
 97                                struct flowi *fl, bool strict);
 98 
 99 static 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 
119 int 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 
125 static 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 
146 int ip6_route_me_harder(struct net *net, struct sock *sk, struct sk_buff *skb);
147 
148 static 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 
164 static 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 
181 static inline int nf_cookie_v6_check(const struct ipv6hdr *iph,
182                                      const struct tcphdr *th, __u32 cookie)
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, cookie);
190 #elif IS_BUILTIN(CONFIG_IPV6)
191         return __cookie_v6_check(iph, th, cookie);
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 
200 int ipv6_netfilter_init(void);
201 void ipv6_netfilter_fini(void);
202 
203 #else /* CONFIG_NETFILTER */
204 static inline int ipv6_netfilter_init(void) { return 0; }
205 static inline void ipv6_netfilter_fini(void) { return; }
206 static inline const struct nf_ipv6_ops *nf_get_ipv6_ops(void) { return NULL; }
207 #endif /* CONFIG_NETFILTER */
208 
209 #endif /*__LINUX_IP6_NETFILTER_H*/
210 

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