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                                                  struct sock *sk,
  74                                                  struct flowi *fl);
  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