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);
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)
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);
190#elif IS_BUILTIN(CONFIG_IPV6)
191 return __cookie_v6_check(iph, th);
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 nf_ip6_check_hbh_len(struct sk_buff *skb, u32 *plen);
201
202int ipv6_netfilter_init(void);
203void ipv6_netfilter_fini(void);
204
205#else /* CONFIG_NETFILTER */
206static inline int ipv6_netfilter_init(void) { return 0; }
207static inline void ipv6_netfilter_fini(void) { return; }
208static inline const struct nf_ipv6_ops *nf_get_ipv6_ops(void) { return NULL; }
209#endif /* CONFIG_NETFILTER */
210
211#endif /*__LINUX_IP6_NETFILTER_H*/
212