210 lines
5.8 KiB
C
210 lines
5.8 KiB
C
/* IPv6-specific defines for netfilter.
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* (C)1998 Rusty Russell -- This code is GPL.
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* (C)1999 David Jeffery
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* this header was blatantly ripped from netfilter_ipv4.h
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* it's amazing what adding a bunch of 6s can do =8^)
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*/
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#ifndef __LINUX_IP6_NETFILTER_H
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#define __LINUX_IP6_NETFILTER_H
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#include <uapi/linux/netfilter_ipv6.h>
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#include <net/tcp.h>
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/* Check for an extension */
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static inline int
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nf_ip6_ext_hdr(u8 nexthdr)
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{ return (nexthdr == IPPROTO_HOPOPTS) ||
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(nexthdr == IPPROTO_ROUTING) ||
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(nexthdr == IPPROTO_FRAGMENT) ||
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(nexthdr == IPPROTO_ESP) ||
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(nexthdr == IPPROTO_AH) ||
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(nexthdr == IPPROTO_NONE) ||
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(nexthdr == IPPROTO_DSTOPTS);
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}
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/* Extra routing may needed on local out, as the QUEUE target never returns
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* control to the table.
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*/
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struct ip6_rt_info {
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struct in6_addr daddr;
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struct in6_addr saddr;
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u_int32_t mark;
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};
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struct nf_queue_entry;
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struct nf_bridge_frag_data;
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/*
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* Hook functions for ipv6 to allow xt_* modules to be built-in even
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* if IPv6 is a module.
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*/
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struct nf_ipv6_ops {
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#if IS_MODULE(CONFIG_IPV6)
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int (*chk_addr)(struct net *net, const struct in6_addr *addr,
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const struct net_device *dev, int strict);
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int (*route_me_harder)(struct net *net, struct sock *sk, struct sk_buff *skb);
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int (*dev_get_saddr)(struct net *net, const struct net_device *dev,
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const struct in6_addr *daddr, unsigned int srcprefs,
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struct in6_addr *saddr);
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int (*route)(struct net *net, struct dst_entry **dst, struct flowi *fl,
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bool strict);
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u32 (*cookie_init_sequence)(const struct ipv6hdr *iph,
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const struct tcphdr *th, u16 *mssp);
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int (*cookie_v6_check)(const struct ipv6hdr *iph,
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const struct tcphdr *th, __u32 cookie);
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#endif
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void (*route_input)(struct sk_buff *skb);
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int (*fragment)(struct net *net, struct sock *sk, struct sk_buff *skb,
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int (*output)(struct net *, struct sock *, struct sk_buff *));
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int (*reroute)(struct sk_buff *skb, const struct nf_queue_entry *entry);
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#if IS_MODULE(CONFIG_IPV6)
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int (*br_fragment)(struct net *net, struct sock *sk,
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struct sk_buff *skb,
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struct nf_bridge_frag_data *data,
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int (*output)(struct net *, struct sock *sk,
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const struct nf_bridge_frag_data *data,
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struct sk_buff *));
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#endif
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};
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#ifdef CONFIG_NETFILTER
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#include <net/addrconf.h>
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extern const struct nf_ipv6_ops __rcu *nf_ipv6_ops;
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static inline const struct nf_ipv6_ops *nf_get_ipv6_ops(void)
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{
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return rcu_dereference(nf_ipv6_ops);
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}
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static inline int nf_ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
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const struct net_device *dev, int strict)
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{
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#if IS_MODULE(CONFIG_IPV6)
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const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops();
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if (!v6_ops)
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return 1;
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return v6_ops->chk_addr(net, addr, dev, strict);
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#elif IS_BUILTIN(CONFIG_IPV6)
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return ipv6_chk_addr(net, addr, dev, strict);
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#else
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return 1;
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#endif
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}
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int __nf_ip6_route(struct net *net, struct dst_entry **dst,
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struct flowi *fl, bool strict);
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static inline int nf_ip6_route(struct net *net, struct dst_entry **dst,
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struct flowi *fl, bool strict)
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{
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#if IS_MODULE(CONFIG_IPV6)
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const struct nf_ipv6_ops *v6ops = nf_get_ipv6_ops();
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if (v6ops)
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return v6ops->route(net, dst, fl, strict);
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return -EHOSTUNREACH;
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#endif
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#if IS_BUILTIN(CONFIG_IPV6)
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return __nf_ip6_route(net, dst, fl, strict);
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#else
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return -EHOSTUNREACH;
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#endif
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}
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#include <net/netfilter/ipv6/nf_defrag_ipv6.h>
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int br_ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
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struct nf_bridge_frag_data *data,
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int (*output)(struct net *, struct sock *sk,
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const struct nf_bridge_frag_data *data,
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struct sk_buff *));
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static inline int nf_br_ip6_fragment(struct net *net, struct sock *sk,
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struct sk_buff *skb,
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struct nf_bridge_frag_data *data,
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int (*output)(struct net *, struct sock *sk,
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const struct nf_bridge_frag_data *data,
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struct sk_buff *))
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{
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#if IS_MODULE(CONFIG_IPV6)
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const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops();
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if (!v6_ops)
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return 1;
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return v6_ops->br_fragment(net, sk, skb, data, output);
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#elif IS_BUILTIN(CONFIG_IPV6)
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return br_ip6_fragment(net, sk, skb, data, output);
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#else
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return 1;
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#endif
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}
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int ip6_route_me_harder(struct net *net, struct sock *sk, struct sk_buff *skb);
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static inline int nf_ip6_route_me_harder(struct net *net, struct sock *sk, struct sk_buff *skb)
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{
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#if IS_MODULE(CONFIG_IPV6)
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const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops();
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if (!v6_ops)
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return -EHOSTUNREACH;
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return v6_ops->route_me_harder(net, sk, skb);
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#elif IS_BUILTIN(CONFIG_IPV6)
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return ip6_route_me_harder(net, sk, skb);
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#else
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return -EHOSTUNREACH;
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#endif
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}
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static inline u32 nf_ipv6_cookie_init_sequence(const struct ipv6hdr *iph,
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const struct tcphdr *th,
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u16 *mssp)
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{
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#if IS_ENABLED(CONFIG_SYN_COOKIES)
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#if IS_MODULE(CONFIG_IPV6)
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const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops();
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if (v6_ops)
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return v6_ops->cookie_init_sequence(iph, th, mssp);
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#elif IS_BUILTIN(CONFIG_IPV6)
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return __cookie_v6_init_sequence(iph, th, mssp);
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#endif
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#endif
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return 0;
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}
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static inline int nf_cookie_v6_check(const struct ipv6hdr *iph,
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const struct tcphdr *th, __u32 cookie)
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{
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#if IS_ENABLED(CONFIG_SYN_COOKIES)
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#if IS_MODULE(CONFIG_IPV6)
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const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops();
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if (v6_ops)
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return v6_ops->cookie_v6_check(iph, th, cookie);
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#elif IS_BUILTIN(CONFIG_IPV6)
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return __cookie_v6_check(iph, th, cookie);
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#endif
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#endif
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return 0;
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}
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__sum16 nf_ip6_checksum(struct sk_buff *skb, unsigned int hook,
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unsigned int dataoff, u_int8_t protocol);
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int ipv6_netfilter_init(void);
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void ipv6_netfilter_fini(void);
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#else /* CONFIG_NETFILTER */
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static inline int ipv6_netfilter_init(void) { return 0; }
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static inline void ipv6_netfilter_fini(void) { return; }
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static inline const struct nf_ipv6_ops *nf_get_ipv6_ops(void) { return NULL; }
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#endif /* CONFIG_NETFILTER */
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#endif /*__LINUX_IP6_NETFILTER_H*/
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