ipv6: ip6_route_output does not modify sk parameter, so make it const
[linux-2.6.git] / include / net / ip6_route.h
1 #ifndef _NET_IP6_ROUTE_H
2 #define _NET_IP6_ROUTE_H
3
4 #define IP6_RT_PRIO_USER        1024
5 #define IP6_RT_PRIO_ADDRCONF    256
6
7 struct route_info {
8         __u8                    type;
9         __u8                    length;
10         __u8                    prefix_len;
11 #if defined(__BIG_ENDIAN_BITFIELD)
12         __u8                    reserved_h:3,
13                                 route_pref:2,
14                                 reserved_l:3;
15 #elif defined(__LITTLE_ENDIAN_BITFIELD)
16         __u8                    reserved_l:3,
17                                 route_pref:2,
18                                 reserved_h:3;
19 #endif
20         __be32                  lifetime;
21         __u8                    prefix[0];      /* 0,8 or 16 */
22 };
23
24 #ifdef __KERNEL__
25
26 #include <net/flow.h>
27 #include <net/ip6_fib.h>
28 #include <net/sock.h>
29 #include <linux/ip.h>
30 #include <linux/ipv6.h>
31
32 #define RT6_LOOKUP_F_IFACE              0x00000001
33 #define RT6_LOOKUP_F_REACHABLE          0x00000002
34 #define RT6_LOOKUP_F_HAS_SADDR          0x00000004
35 #define RT6_LOOKUP_F_SRCPREF_TMP        0x00000008
36 #define RT6_LOOKUP_F_SRCPREF_PUBLIC     0x00000010
37 #define RT6_LOOKUP_F_SRCPREF_COA        0x00000020
38
39 /*
40  * rt6_srcprefs2flags() and rt6_flags2srcprefs() translate
41  * between IPV6_ADDR_PREFERENCES socket option values
42  *      IPV6_PREFER_SRC_TMP    = 0x1
43  *      IPV6_PREFER_SRC_PUBLIC = 0x2
44  *      IPV6_PREFER_SRC_COA    = 0x4
45  * and above RT6_LOOKUP_F_SRCPREF_xxx flags.
46  */
47 static inline int rt6_srcprefs2flags(unsigned int srcprefs)
48 {
49         /* No need to bitmask because srcprefs have only 3 bits. */
50         return srcprefs << 3;
51 }
52
53 static inline unsigned int rt6_flags2srcprefs(int flags)
54 {
55         return (flags >> 3) & 7;
56 }
57
58 extern void                     rt6_bind_peer(struct rt6_info *rt,
59                                               int create);
60
61 static inline struct inet_peer *rt6_get_peer(struct rt6_info *rt)
62 {
63         if (rt->rt6i_peer)
64                 return rt->rt6i_peer;
65
66         rt6_bind_peer(rt, 0);
67         return rt->rt6i_peer;
68 }
69
70 extern void                     ip6_route_input(struct sk_buff *skb);
71
72 extern struct dst_entry *       ip6_route_output(struct net *net,
73                                                  const struct sock *sk,
74                                                  struct flowi6 *fl6);
75
76 extern int                      ip6_route_init(void);
77 extern void                     ip6_route_cleanup(void);
78
79 extern int                      ipv6_route_ioctl(struct net *net,
80                                                  unsigned int cmd,
81                                                  void __user *arg);
82
83 extern int                      ip6_route_add(struct fib6_config *cfg);
84 extern int                      ip6_ins_rt(struct rt6_info *);
85 extern int                      ip6_del_rt(struct rt6_info *);
86
87 extern struct rt6_info          *rt6_lookup(struct net *net,
88                                             const struct in6_addr *daddr,
89                                             const struct in6_addr *saddr,
90                                             int oif, int flags);
91
92 extern struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
93                                          struct neighbour *neigh,
94                                          const struct in6_addr *addr);
95 extern int icmp6_dst_gc(void);
96
97 extern void fib6_force_start_gc(struct net *net);
98
99 extern struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
100                                            const struct in6_addr *addr,
101                                            int anycast);
102
103 extern int                      ip6_dst_hoplimit(struct dst_entry *dst);
104
105 /*
106  *      support functions for ND
107  *
108  */
109 extern struct rt6_info *        rt6_get_dflt_router(struct in6_addr *addr,
110                                                     struct net_device *dev);
111 extern struct rt6_info *        rt6_add_dflt_router(struct in6_addr *gwaddr,
112                                                     struct net_device *dev,
113                                                     unsigned int pref);
114
115 extern void                     rt6_purge_dflt_routers(struct net *net);
116
117 extern int                      rt6_route_rcv(struct net_device *dev,
118                                               u8 *opt, int len,
119                                               struct in6_addr *gwaddr);
120
121 extern void                     rt6_redirect(struct in6_addr *dest,
122                                              struct in6_addr *src,
123                                              struct in6_addr *saddr,
124                                              struct neighbour *neigh,
125                                              u8 *lladdr,
126                                              int on_link);
127
128 extern void                     rt6_pmtu_discovery(struct in6_addr *daddr,
129                                                    struct in6_addr *saddr,
130                                                    struct net_device *dev,
131                                                    u32 pmtu);
132
133 struct netlink_callback;
134
135 struct rt6_rtnl_dump_arg {
136         struct sk_buff *skb;
137         struct netlink_callback *cb;
138         struct net *net;
139 };
140
141 extern int rt6_dump_route(struct rt6_info *rt, void *p_arg);
142 extern void rt6_ifdown(struct net *net, struct net_device *dev);
143 extern void rt6_mtu_change(struct net_device *dev, unsigned mtu);
144
145
146 /*
147  *      Store a destination cache entry in a socket
148  */
149 static inline void __ip6_dst_store(struct sock *sk, struct dst_entry *dst,
150                                    struct in6_addr *daddr, struct in6_addr *saddr)
151 {
152         struct ipv6_pinfo *np = inet6_sk(sk);
153         struct rt6_info *rt = (struct rt6_info *) dst;
154
155         sk_setup_caps(sk, dst);
156         np->daddr_cache = daddr;
157 #ifdef CONFIG_IPV6_SUBTREES
158         np->saddr_cache = saddr;
159 #endif
160         np->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
161 }
162
163 static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
164                                  struct in6_addr *daddr, struct in6_addr *saddr)
165 {
166         spin_lock(&sk->sk_dst_lock);
167         __ip6_dst_store(sk, dst, daddr, saddr);
168         spin_unlock(&sk->sk_dst_lock);
169 }
170
171 static inline int ipv6_unicast_destination(struct sk_buff *skb)
172 {
173         struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
174
175         return rt->rt6i_flags & RTF_LOCAL;
176 }
177
178 int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
179
180 static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
181 {
182         struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL;
183
184         return (np && np->pmtudisc == IPV6_PMTUDISC_PROBE) ?
185                skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
186 }
187
188 #endif
189 #endif