LCOV - code coverage report
Current view: top level - include/linux - netfilter_ipv6.h (source / functions) Hit Total Coverage
Test: landlock.info Lines: 0 2 0.0 %
Date: 2021-04-22 12:43:58 Functions: 0 0 -

          Line data    Source code
       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           0 : 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           0 :         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*/

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