diff options
Diffstat (limited to 'include/linux/netfilter_ipv6.h')
| -rw-r--r-- | include/linux/netfilter_ipv6.h | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/include/linux/netfilter_ipv6.h b/include/linux/netfilter_ipv6.h new file mode 100644 index 000000000..48314ade1 --- /dev/null +++ b/include/linux/netfilter_ipv6.h @@ -0,0 +1,209 @@ +/* IPv6-specific defines for netfilter. + * (C)1998 Rusty Russell -- This code is GPL. + * (C)1999 David Jeffery + * this header was blatantly ripped from netfilter_ipv4.h + * it's amazing what adding a bunch of 6s can do =8^) + */ +#ifndef __LINUX_IP6_NETFILTER_H +#define __LINUX_IP6_NETFILTER_H + +#include <uapi/linux/netfilter_ipv6.h> +#include <net/tcp.h> + +/* Check for an extension */ +static inline int +nf_ip6_ext_hdr(u8 nexthdr) +{ return (nexthdr == IPPROTO_HOPOPTS) || + (nexthdr == IPPROTO_ROUTING) || + (nexthdr == IPPROTO_FRAGMENT) || + (nexthdr == IPPROTO_ESP) || + (nexthdr == IPPROTO_AH) || + (nexthdr == IPPROTO_NONE) || + (nexthdr == IPPROTO_DSTOPTS); +} + +/* Extra routing may needed on local out, as the QUEUE target never returns + * control to the table. + */ +struct ip6_rt_info { + struct in6_addr daddr; + struct in6_addr saddr; + u_int32_t mark; +}; + +struct nf_queue_entry; +struct nf_bridge_frag_data; + +/* + * Hook functions for ipv6 to allow xt_* modules to be built-in even + * if IPv6 is a module. + */ +struct nf_ipv6_ops { +#if IS_MODULE(CONFIG_IPV6) + int (*chk_addr)(struct net *net, const struct in6_addr *addr, + const struct net_device *dev, int strict); + int (*route_me_harder)(struct net *net, struct sock *sk, struct sk_buff *skb); + int (*dev_get_saddr)(struct net *net, const struct net_device *dev, + const struct in6_addr *daddr, unsigned int srcprefs, + struct in6_addr *saddr); + int (*route)(struct net *net, struct dst_entry **dst, struct flowi *fl, + bool strict); + u32 (*cookie_init_sequence)(const struct ipv6hdr *iph, + const struct tcphdr *th, u16 *mssp); + int (*cookie_v6_check)(const struct ipv6hdr *iph, + const struct tcphdr *th, __u32 cookie); +#endif + void (*route_input)(struct sk_buff *skb); + int (*fragment)(struct net *net, struct sock *sk, struct sk_buff *skb, + int (*output)(struct net *, struct sock *, struct sk_buff *)); + int (*reroute)(struct sk_buff *skb, const struct nf_queue_entry *entry); +#if IS_MODULE(CONFIG_IPV6) + int (*br_fragment)(struct net *net, struct sock *sk, + struct sk_buff *skb, + struct nf_bridge_frag_data *data, + int (*output)(struct net *, struct sock *sk, + const struct nf_bridge_frag_data *data, + struct sk_buff *)); +#endif +}; + +#ifdef CONFIG_NETFILTER +#include <net/addrconf.h> + +extern const struct nf_ipv6_ops __rcu *nf_ipv6_ops; +static inline const struct nf_ipv6_ops *nf_get_ipv6_ops(void) +{ + return rcu_dereference(nf_ipv6_ops); +} + +static inline int nf_ipv6_chk_addr(struct net *net, const struct in6_addr *addr, + const struct net_device *dev, int strict) +{ +#if IS_MODULE(CONFIG_IPV6) + const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops(); + + if (!v6_ops) + return 1; + + return v6_ops->chk_addr(net, addr, dev, strict); +#elif IS_BUILTIN(CONFIG_IPV6) + return ipv6_chk_addr(net, addr, dev, strict); +#else + return 1; +#endif +} + +int __nf_ip6_route(struct net *net, struct dst_entry **dst, + struct flowi *fl, bool strict); + +static inline int nf_ip6_route(struct net *net, struct dst_entry **dst, + struct flowi *fl, bool strict) +{ +#if IS_MODULE(CONFIG_IPV6) + const struct nf_ipv6_ops *v6ops = nf_get_ipv6_ops(); + + if (v6ops) + return v6ops->route(net, dst, fl, strict); + + return -EHOSTUNREACH; +#endif +#if IS_BUILTIN(CONFIG_IPV6) + return __nf_ip6_route(net, dst, fl, strict); +#else + return -EHOSTUNREACH; +#endif +} + +#include <net/netfilter/ipv6/nf_defrag_ipv6.h> + +int br_ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, + struct nf_bridge_frag_data *data, + int (*output)(struct net *, struct sock *sk, + const struct nf_bridge_frag_data *data, + struct sk_buff *)); + +static inline int nf_br_ip6_fragment(struct net *net, struct sock *sk, + struct sk_buff *skb, + struct nf_bridge_frag_data *data, + int (*output)(struct net *, struct sock *sk, + const struct nf_bridge_frag_data *data, + struct sk_buff *)) +{ +#if IS_MODULE(CONFIG_IPV6) + const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops(); + + if (!v6_ops) + return 1; + + return v6_ops->br_fragment(net, sk, skb, data, output); +#elif IS_BUILTIN(CONFIG_IPV6) + return br_ip6_fragment(net, sk, skb, data, output); +#else + return 1; +#endif +} + +int ip6_route_me_harder(struct net *net, struct sock *sk, struct sk_buff *skb); + +static inline int nf_ip6_route_me_harder(struct net *net, struct sock *sk, struct sk_buff *skb) +{ +#if IS_MODULE(CONFIG_IPV6) + const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops(); + + if (!v6_ops) + return -EHOSTUNREACH; + + return v6_ops->route_me_harder(net, sk, skb); +#elif IS_BUILTIN(CONFIG_IPV6) + return ip6_route_me_harder(net, sk, skb); +#else + return -EHOSTUNREACH; +#endif +} + +static inline u32 nf_ipv6_cookie_init_sequence(const struct ipv6hdr *iph, + const struct tcphdr *th, + u16 *mssp) +{ +#if IS_ENABLED(CONFIG_SYN_COOKIES) +#if IS_MODULE(CONFIG_IPV6) + const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops(); + + if (v6_ops) + return v6_ops->cookie_init_sequence(iph, th, mssp); +#elif IS_BUILTIN(CONFIG_IPV6) + return __cookie_v6_init_sequence(iph, th, mssp); +#endif +#endif + return 0; +} + +static inline int nf_cookie_v6_check(const struct ipv6hdr *iph, + const struct tcphdr *th, __u32 cookie) +{ +#if IS_ENABLED(CONFIG_SYN_COOKIES) +#if IS_MODULE(CONFIG_IPV6) + const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops(); + + if (v6_ops) + return v6_ops->cookie_v6_check(iph, th, cookie); +#elif IS_BUILTIN(CONFIG_IPV6) + return __cookie_v6_check(iph, th, cookie); +#endif +#endif + return 0; +} + +__sum16 nf_ip6_checksum(struct sk_buff *skb, unsigned int hook, + unsigned int dataoff, u_int8_t protocol); + +int ipv6_netfilter_init(void); +void ipv6_netfilter_fini(void); + +#else /* CONFIG_NETFILTER */ +static inline int ipv6_netfilter_init(void) { return 0; } +static inline void ipv6_netfilter_fini(void) { return; } +static inline const struct nf_ipv6_ops *nf_get_ipv6_ops(void) { return NULL; } +#endif /* CONFIG_NETFILTER */ + +#endif /*__LINUX_IP6_NETFILTER_H*/ |