Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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/* Extra routing may needed on local out, as the QUEUE target never returns
14 * control to the table.
15 */
16struct ip6_rt_info {
17 struct in6_addr daddr;
18 struct in6_addr saddr;
19 u_int32_t mark;
20};
21
22struct nf_queue_entry;
23struct nf_ct_bridge_frag_data;
24
25/*
26 * Hook functions for ipv6 to allow xt_* modules to be built-in even
27 * if IPv6 is a module.
28 */
29struct nf_ipv6_ops {
30#if IS_MODULE(CONFIG_IPV6)
31 int (*chk_addr)(struct net *net, const struct in6_addr *addr,
32 const struct net_device *dev, int strict);
33 int (*route_me_harder)(struct net *net, struct sk_buff *skb);
34 int (*dev_get_saddr)(struct net *net, const struct net_device *dev,
35 const struct in6_addr *daddr, unsigned int srcprefs,
36 struct in6_addr *saddr);
37 int (*route)(struct net *net, struct dst_entry **dst, struct flowi *fl,
38 bool strict);
39 u32 (*cookie_init_sequence)(const struct ipv6hdr *iph,
40 const struct tcphdr *th, u16 *mssp);
41 int (*cookie_v6_check)(const struct ipv6hdr *iph,
42 const struct tcphdr *th, __u32 cookie);
43#endif
44 void (*route_input)(struct sk_buff *skb);
45 int (*fragment)(struct net *net, struct sock *sk, struct sk_buff *skb,
46 int (*output)(struct net *, struct sock *, struct sk_buff *));
47 int (*reroute)(struct sk_buff *skb, const struct nf_queue_entry *entry);
48#if IS_MODULE(CONFIG_IPV6)
49 int (*br_defrag)(struct net *net, struct sk_buff *skb, u32 user);
50 int (*br_fragment)(struct net *net, struct sock *sk,
51 struct sk_buff *skb,
52 struct nf_ct_bridge_frag_data *data,
53 int (*output)(struct net *, struct sock *sk,
54 const struct nf_ct_bridge_frag_data *data,
55 struct sk_buff *));
56#endif
57};
58
59#ifdef CONFIG_NETFILTER
60#include <net/addrconf.h>
61
62extern const struct nf_ipv6_ops __rcu *nf_ipv6_ops;
63static inline const struct nf_ipv6_ops *nf_get_ipv6_ops(void)
64{
65 return rcu_dereference(nf_ipv6_ops);
66}
67
68static inline int nf_ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
69 const struct net_device *dev, int strict)
70{
71#if IS_MODULE(CONFIG_IPV6)
72 const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops();
73
74 if (!v6_ops)
75 return 1;
76
77 return v6_ops->chk_addr(net, addr, dev, strict);
78#elif IS_BUILTIN(CONFIG_IPV6)
79 return ipv6_chk_addr(net, addr, dev, strict);
80#else
81 return 1;
82#endif
83}
84
85int __nf_ip6_route(struct net *net, struct dst_entry **dst,
86 struct flowi *fl, bool strict);
87
88static inline int nf_ip6_route(struct net *net, struct dst_entry **dst,
89 struct flowi *fl, bool strict)
90{
91#if IS_MODULE(CONFIG_IPV6)
92 const struct nf_ipv6_ops *v6ops = nf_get_ipv6_ops();
93
94 if (v6ops)
95 return v6ops->route(net, dst, fl, strict);
96
97 return -EHOSTUNREACH;
98#endif
99#if IS_BUILTIN(CONFIG_IPV6)
100 return __nf_ip6_route(net, dst, fl, strict);
101#else
102 return -EHOSTUNREACH;
103#endif
104}
105
106#include <net/netfilter/ipv6/nf_defrag_ipv6.h>
107
108static inline int nf_ipv6_br_defrag(struct net *net, struct sk_buff *skb,
109 u32 user)
110{
111#if IS_MODULE(CONFIG_IPV6)
112 const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops();
113
114 if (!v6_ops)
115 return 1;
116
117 return v6_ops->br_defrag(net, skb, user);
118#elif IS_BUILTIN(CONFIG_IPV6)
119 return nf_ct_frag6_gather(net, skb, user);
120#else
121 return 1;
122#endif
123}
124
125int br_ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
126 struct nf_ct_bridge_frag_data *data,
127 int (*output)(struct net *, struct sock *sk,
128 const struct nf_ct_bridge_frag_data *data,
129 struct sk_buff *));
130
131static inline int nf_br_ip6_fragment(struct net *net, struct sock *sk,
132 struct sk_buff *skb,
133 struct nf_ct_bridge_frag_data *data,
134 int (*output)(struct net *, struct sock *sk,
135 const struct nf_ct_bridge_frag_data *data,
136 struct sk_buff *))
137{
138#if IS_MODULE(CONFIG_IPV6)
139 const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops();
140
141 if (!v6_ops)
142 return 1;
143
144 return v6_ops->br_fragment(net, sk, skb, data, output);
145#elif IS_BUILTIN(CONFIG_IPV6)
146 return br_ip6_fragment(net, sk, skb, data, output);
147#else
148 return 1;
149#endif
150}
151
152int ip6_route_me_harder(struct net *net, struct sk_buff *skb);
153
154static inline int nf_ip6_route_me_harder(struct net *net, struct sk_buff *skb)
155{
156#if IS_MODULE(CONFIG_IPV6)
157 const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops();
158
159 if (!v6_ops)
160 return -EHOSTUNREACH;
161
162 return v6_ops->route_me_harder(net, skb);
163#elif IS_BUILTIN(CONFIG_IPV6)
164 return ip6_route_me_harder(net, skb);
165#else
166 return -EHOSTUNREACH;
167#endif
168}
169
170static inline u32 nf_ipv6_cookie_init_sequence(const struct ipv6hdr *iph,
171 const struct tcphdr *th,
172 u16 *mssp)
173{
174#if IS_ENABLED(CONFIG_SYN_COOKIES)
175#if IS_MODULE(CONFIG_IPV6)
176 const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops();
177
178 if (v6_ops)
179 return v6_ops->cookie_init_sequence(iph, th, mssp);
180#elif IS_BUILTIN(CONFIG_IPV6)
181 return __cookie_v6_init_sequence(iph, th, mssp);
182#endif
183#endif
184 return 0;
185}
186
187static inline int nf_cookie_v6_check(const struct ipv6hdr *iph,
188 const struct tcphdr *th, __u32 cookie)
189{
190#if IS_ENABLED(CONFIG_SYN_COOKIES)
191#if IS_MODULE(CONFIG_IPV6)
192 const struct nf_ipv6_ops *v6_ops = nf_get_ipv6_ops();
193
194 if (v6_ops)
195 return v6_ops->cookie_v6_check(iph, th, cookie);
196#elif IS_BUILTIN(CONFIG_IPV6)
197 return __cookie_v6_check(iph, th, cookie);
198#endif
199#endif
200 return 0;
201}
202
203__sum16 nf_ip6_checksum(struct sk_buff *skb, unsigned int hook,
204 unsigned int dataoff, u_int8_t protocol);
205
206int ipv6_netfilter_init(void);
207void ipv6_netfilter_fini(void);
208
209#else /* CONFIG_NETFILTER */
210static inline int ipv6_netfilter_init(void) { return 0; }
211static inline void ipv6_netfilter_fini(void) { return; }
212static inline const struct nf_ipv6_ops *nf_get_ipv6_ops(void) { return NULL; }
213#endif /* CONFIG_NETFILTER */
214
215#endif /*__LINUX_IP6_NETFILTER_H*/