ipv6: move ip6_dst_hoplimit() into core kernel
[karo-tx-linux.git] / include / net / ip6_route.h
1 #ifndef _NET_IP6_ROUTE_H
2 #define _NET_IP6_ROUTE_H
3
4 struct route_info {
5         __u8                    type;
6         __u8                    length;
7         __u8                    prefix_len;
8 #if defined(__BIG_ENDIAN_BITFIELD)
9         __u8                    reserved_h:3,
10                                 route_pref:2,
11                                 reserved_l:3;
12 #elif defined(__LITTLE_ENDIAN_BITFIELD)
13         __u8                    reserved_l:3,
14                                 route_pref:2,
15                                 reserved_h:3;
16 #endif
17         __be32                  lifetime;
18         __u8                    prefix[0];      /* 0,8 or 16 */
19 };
20
21 #include <net/flow.h>
22 #include <net/ip6_fib.h>
23 #include <net/sock.h>
24 #include <linux/ip.h>
25 #include <linux/ipv6.h>
26 #include <linux/route.h>
27
28 #define RT6_LOOKUP_F_IFACE              0x00000001
29 #define RT6_LOOKUP_F_REACHABLE          0x00000002
30 #define RT6_LOOKUP_F_HAS_SADDR          0x00000004
31 #define RT6_LOOKUP_F_SRCPREF_TMP        0x00000008
32 #define RT6_LOOKUP_F_SRCPREF_PUBLIC     0x00000010
33 #define RT6_LOOKUP_F_SRCPREF_COA        0x00000020
34
35 /*
36  * rt6_srcprefs2flags() and rt6_flags2srcprefs() translate
37  * between IPV6_ADDR_PREFERENCES socket option values
38  *      IPV6_PREFER_SRC_TMP    = 0x1
39  *      IPV6_PREFER_SRC_PUBLIC = 0x2
40  *      IPV6_PREFER_SRC_COA    = 0x4
41  * and above RT6_LOOKUP_F_SRCPREF_xxx flags.
42  */
43 static inline int rt6_srcprefs2flags(unsigned int srcprefs)
44 {
45         /* No need to bitmask because srcprefs have only 3 bits. */
46         return srcprefs << 3;
47 }
48
49 static inline unsigned int rt6_flags2srcprefs(int flags)
50 {
51         return (flags >> 3) & 7;
52 }
53
54 extern void rt6_bind_peer(struct rt6_info *rt, int create);
55
56 static inline struct inet_peer *__rt6_get_peer(struct rt6_info *rt, int create)
57 {
58         if (rt6_has_peer(rt))
59                 return rt6_peer_ptr(rt);
60
61         rt6_bind_peer(rt, create);
62         return (rt6_has_peer(rt) ? rt6_peer_ptr(rt) : NULL);
63 }
64
65 static inline struct inet_peer *rt6_get_peer(struct rt6_info *rt)
66 {
67         return __rt6_get_peer(rt, 0);
68 }
69
70 static inline struct inet_peer *rt6_get_peer_create(struct rt6_info *rt)
71 {
72         return __rt6_get_peer(rt, 1);
73 }
74
75 extern void                     ip6_route_input(struct sk_buff *skb);
76
77 extern struct dst_entry *       ip6_route_output(struct net *net,
78                                                  const struct sock *sk,
79                                                  struct flowi6 *fl6);
80 extern struct dst_entry *       ip6_route_lookup(struct net *net,
81                                                  struct flowi6 *fl6, int flags);
82
83 extern int                      ip6_route_init(void);
84 extern void                     ip6_route_cleanup(void);
85
86 extern int                      ipv6_route_ioctl(struct net *net,
87                                                  unsigned int cmd,
88                                                  void __user *arg);
89
90 extern int                      ip6_route_add(struct fib6_config *cfg);
91 extern int                      ip6_ins_rt(struct rt6_info *);
92 extern int                      ip6_del_rt(struct rt6_info *);
93
94 extern int                      ip6_route_get_saddr(struct net *net,
95                                                     struct rt6_info *rt,
96                                                     const struct in6_addr *daddr,
97                                                     unsigned int prefs,
98                                                     struct in6_addr *saddr);
99
100 extern struct rt6_info          *rt6_lookup(struct net *net,
101                                             const struct in6_addr *daddr,
102                                             const struct in6_addr *saddr,
103                                             int oif, int flags);
104
105 extern struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
106                                          struct flowi6 *fl6);
107 extern int icmp6_dst_gc(void);
108
109 extern void fib6_force_start_gc(struct net *net);
110
111 extern struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
112                                            const struct in6_addr *addr,
113                                            bool anycast);
114
115 /*
116  *      support functions for ND
117  *
118  */
119 extern struct rt6_info *        rt6_get_dflt_router(const struct in6_addr *addr,
120                                                     struct net_device *dev);
121 extern struct rt6_info *        rt6_add_dflt_router(const struct in6_addr *gwaddr,
122                                                     struct net_device *dev,
123                                                     unsigned int pref);
124
125 extern void                     rt6_purge_dflt_routers(struct net *net);
126
127 extern int                      rt6_route_rcv(struct net_device *dev,
128                                               u8 *opt, int len,
129                                               const struct in6_addr *gwaddr);
130
131 extern void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
132                             int oif, u32 mark);
133 extern void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk,
134                                __be32 mtu);
135 extern void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark);
136 extern void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
137                                    u32 mark);
138 extern void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk);
139
140 struct netlink_callback;
141
142 struct rt6_rtnl_dump_arg {
143         struct sk_buff *skb;
144         struct netlink_callback *cb;
145         struct net *net;
146 };
147
148 extern int rt6_dump_route(struct rt6_info *rt, void *p_arg);
149 extern void rt6_ifdown(struct net *net, struct net_device *dev);
150 extern void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
151 extern void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
152
153
154 /*
155  *      Store a destination cache entry in a socket
156  */
157 static inline void __ip6_dst_store(struct sock *sk, struct dst_entry *dst,
158                                    const struct in6_addr *daddr,
159                                    const struct in6_addr *saddr)
160 {
161         struct ipv6_pinfo *np = inet6_sk(sk);
162         struct rt6_info *rt = (struct rt6_info *) dst;
163
164         sk_setup_caps(sk, dst);
165         np->daddr_cache = daddr;
166 #ifdef CONFIG_IPV6_SUBTREES
167         np->saddr_cache = saddr;
168 #endif
169         np->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
170 }
171
172 static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
173                                  struct in6_addr *daddr, struct in6_addr *saddr)
174 {
175         spin_lock(&sk->sk_dst_lock);
176         __ip6_dst_store(sk, dst, daddr, saddr);
177         spin_unlock(&sk->sk_dst_lock);
178 }
179
180 static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
181 {
182         struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
183
184         return rt->rt6i_flags & RTF_LOCAL;
185 }
186
187 int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
188
189 static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
190 {
191         struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL;
192
193         return (np && np->pmtudisc == IPV6_PMTUDISC_PROBE) ?
194                skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
195 }
196
197 static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt, struct in6_addr *dest)
198 {
199         if (rt->rt6i_flags & RTF_GATEWAY)
200                 return &rt->rt6i_gateway;
201         return dest;
202 }
203
204 #endif