Merge branch 'for-linus' of git://git.kernel.dk/linux-block
[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 #include <net/flow.h>
25 #include <net/ip6_fib.h>
26 #include <net/sock.h>
27 #include <linux/ip.h>
28 #include <linux/ipv6.h>
29
30 #define RT6_LOOKUP_F_IFACE              0x00000001
31 #define RT6_LOOKUP_F_REACHABLE          0x00000002
32 #define RT6_LOOKUP_F_HAS_SADDR          0x00000004
33 #define RT6_LOOKUP_F_SRCPREF_TMP        0x00000008
34 #define RT6_LOOKUP_F_SRCPREF_PUBLIC     0x00000010
35 #define RT6_LOOKUP_F_SRCPREF_COA        0x00000020
36
37 /*
38  * rt6_srcprefs2flags() and rt6_flags2srcprefs() translate
39  * between IPV6_ADDR_PREFERENCES socket option values
40  *      IPV6_PREFER_SRC_TMP    = 0x1
41  *      IPV6_PREFER_SRC_PUBLIC = 0x2
42  *      IPV6_PREFER_SRC_COA    = 0x4
43  * and above RT6_LOOKUP_F_SRCPREF_xxx flags.
44  */
45 static inline int rt6_srcprefs2flags(unsigned int srcprefs)
46 {
47         /* No need to bitmask because srcprefs have only 3 bits. */
48         return srcprefs << 3;
49 }
50
51 static inline unsigned int rt6_flags2srcprefs(int flags)
52 {
53         return (flags >> 3) & 7;
54 }
55
56 extern void                     rt6_bind_peer(struct rt6_info *rt,
57                                               int create);
58
59 static inline struct inet_peer *rt6_get_peer(struct rt6_info *rt)
60 {
61         if (rt->rt6i_peer)
62                 return rt->rt6i_peer;
63
64         rt6_bind_peer(rt, 0);
65         return rt->rt6i_peer;
66 }
67
68 extern void                     ip6_route_input(struct sk_buff *skb);
69
70 extern struct dst_entry *       ip6_route_output(struct net *net,
71                                                  const struct sock *sk,
72                                                  struct flowi6 *fl6);
73
74 extern int                      ip6_route_init(void);
75 extern void                     ip6_route_cleanup(void);
76
77 extern int                      ipv6_route_ioctl(struct net *net,
78                                                  unsigned int cmd,
79                                                  void __user *arg);
80
81 extern int                      ip6_route_add(struct fib6_config *cfg);
82 extern int                      ip6_ins_rt(struct rt6_info *);
83 extern int                      ip6_del_rt(struct rt6_info *);
84
85 extern int                      ip6_route_get_saddr(struct net *net,
86                                                     struct rt6_info *rt,
87                                                     const struct in6_addr *daddr,
88                                                     unsigned int prefs,
89                                                     struct in6_addr *saddr);
90
91 extern struct rt6_info          *rt6_lookup(struct net *net,
92                                             const struct in6_addr *daddr,
93                                             const struct in6_addr *saddr,
94                                             int oif, int flags);
95
96 extern struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
97                                          struct neighbour *neigh,
98                                          const struct in6_addr *addr);
99 extern int icmp6_dst_gc(void);
100
101 extern void fib6_force_start_gc(struct net *net);
102
103 extern struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
104                                            const struct in6_addr *addr,
105                                            int anycast);
106
107 extern int                      ip6_dst_hoplimit(struct dst_entry *dst);
108
109 /*
110  *      support functions for ND
111  *
112  */
113 extern struct rt6_info *        rt6_get_dflt_router(const struct in6_addr *addr,
114                                                     struct net_device *dev);
115 extern struct rt6_info *        rt6_add_dflt_router(const struct in6_addr *gwaddr,
116                                                     struct net_device *dev,
117                                                     unsigned int pref);
118
119 extern void                     rt6_purge_dflt_routers(struct net *net);
120
121 extern int                      rt6_route_rcv(struct net_device *dev,
122                                               u8 *opt, int len,
123                                               const struct in6_addr *gwaddr);
124
125 extern void                     rt6_redirect(const struct in6_addr *dest,
126                                              const struct in6_addr *src,
127                                              const struct in6_addr *saddr,
128                                              struct neighbour *neigh,
129                                              u8 *lladdr,
130                                              int on_link);
131
132 extern void                     rt6_pmtu_discovery(const struct in6_addr *daddr,
133                                                    const struct in6_addr *saddr,
134                                                    struct net_device *dev,
135                                                    u32 pmtu);
136
137 struct netlink_callback;
138
139 struct rt6_rtnl_dump_arg {
140         struct sk_buff *skb;
141         struct netlink_callback *cb;
142         struct net *net;
143 };
144
145 extern int rt6_dump_route(struct rt6_info *rt, void *p_arg);
146 extern void rt6_ifdown(struct net *net, struct net_device *dev);
147 extern void rt6_mtu_change(struct net_device *dev, unsigned mtu);
148 extern void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
149
150
151 /*
152  *      Store a destination cache entry in a socket
153  */
154 static inline void __ip6_dst_store(struct sock *sk, struct dst_entry *dst,
155                                    struct in6_addr *daddr, struct in6_addr *saddr)
156 {
157         struct ipv6_pinfo *np = inet6_sk(sk);
158         struct rt6_info *rt = (struct rt6_info *) dst;
159
160         sk_setup_caps(sk, dst);
161         np->daddr_cache = daddr;
162 #ifdef CONFIG_IPV6_SUBTREES
163         np->saddr_cache = saddr;
164 #endif
165         np->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
166 }
167
168 static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
169                                  struct in6_addr *daddr, struct in6_addr *saddr)
170 {
171         spin_lock(&sk->sk_dst_lock);
172         __ip6_dst_store(sk, dst, daddr, saddr);
173         spin_unlock(&sk->sk_dst_lock);
174 }
175
176 static inline int ipv6_unicast_destination(struct sk_buff *skb)
177 {
178         struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
179
180         return rt->rt6i_flags & RTF_LOCAL;
181 }
182
183 int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
184
185 static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
186 {
187         struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL;
188
189         return (np && np->pmtudisc == IPV6_PMTUDISC_PROBE) ?
190                skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
191 }
192
193 #endif