LXR linux/include/linux/netfilter

   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, __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
  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, __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
 200int ipv6_netfilter_init(void);
 201void ipv6_netfilter_fini(void);
 202
 203#else /* CONFIG_NETFILTER */
 204static inline int ipv6_netfilter_init(void) { return 0; }
 205static inline void ipv6_netfilter_fini(void) { return; }
 206static 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