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 #define IP6_RT_PRIO_KERN        512
   7
   8 struct route_info {
   9         __u8                    type;
  10         __u8                    length;
  11         __u8                    prefix_len;
  12 #if defined(__BIG_ENDIAN_BITFIELD)
  13         __u8                    reserved_h:3,
  14                                 route_pref:2,
  15                                 reserved_l:3;
  16 #elif defined(__LITTLE_ENDIAN_BITFIELD)
  17         __u8                    reserved_l:3,
  18                                 route_pref:2,
  19                                 reserved_h:3;
  20 #endif
  21         __be32                  lifetime;
  22         __u8                    prefix[0];      /* 0,8 or 16 */
  23 };
  24
  25 #ifdef __KERNEL__
  26
  27 #include <net/flow.h>
  28 #include <net/ip6_fib.h>
  29 #include <net/sock.h>
  30 #include <linux/ip.h>
  31 #include <linux/ipv6.h>
  32
  33 #define RT6_LOOKUP_F_IFACE              0x00000001
  34 #define RT6_LOOKUP_F_REACHABLE          0x00000002
  35 #define RT6_LOOKUP_F_HAS_SADDR          0x00000004
  36 #define RT6_LOOKUP_F_SRCPREF_TMP        0x00000008
  37 #define RT6_LOOKUP_F_SRCPREF_PUBLIC     0x00000010
  38 #define RT6_LOOKUP_F_SRCPREF_COA        0x00000020
  39
  40 /*
  41  * rt6_srcprefs2flags() and rt6_flags2srcprefs() translate
  42  * between IPV6_ADDR_PREFERENCES socket option values
  43  *      IPV6_PREFER_SRC_TMP    = 0x1
  44  *      IPV6_PREFER_SRC_PUBLIC = 0x2
  45  *      IPV6_PREFER_SRC_COA    = 0x4
  46  * and above RT6_LOOKUP_F_SRCPREF_xxx flags.
  47  */
  48 static inline int rt6_srcprefs2flags(unsigned int srcprefs)
  49 {
  50         /* No need to bitmask because srcprefs have only 3 bits. */
  51         return srcprefs << 3;
  52 }
  53
  54 static inline unsigned int rt6_flags2srcprefs(int flags)
  55 {
  56         return (flags >> 3) & 7;
  57 }
  58
  59 extern void                     ip6_route_input(struct sk_buff *skb);
  60
  61 extern struct dst_entry *       ip6_route_output(struct net *net,
  62                                                  struct sock *sk,
  63                                                  struct flowi *fl);
  64
  65 extern int                      ip6_route_init(void);
  66 extern void                     ip6_route_cleanup(void);
  67
  68 extern int                      ipv6_route_ioctl(struct net *net,
  69                                                  unsigned int cmd,
  70                                                  void __user *arg);
  71
  72 extern int                      ip6_route_add(struct fib6_config *cfg);
  73 extern int                      ip6_ins_rt(struct rt6_info *);
  74 extern int                      ip6_del_rt(struct rt6_info *);
  75
  76 extern struct rt6_info          *rt6_lookup(struct net *net,
  77                                             const struct in6_addr *daddr,
  78                                             const struct in6_addr *saddr,
  79                                             int oif, int flags);
  80
  81 extern struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
  82                                          struct neighbour *neigh,
  83                                          const struct in6_addr *addr);
  84 extern int icmp6_dst_gc(void);
  85
  86 extern void fib6_force_start_gc(struct net *net);
  87
  88 extern struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
  89                                            const struct in6_addr *addr,
  90                                            int anycast);
  91
  92 extern int                      ip6_dst_hoplimit(struct dst_entry *dst);
  93
  94 /*
  95  *      support functions for ND
  96  *
  97  */
  98 extern struct rt6_info *        rt6_get_dflt_router(struct in6_addr *addr,
  99                                                     struct net_device *dev);
 100 extern struct rt6_info *        rt6_add_dflt_router(struct in6_addr *gwaddr,
 101                                                     struct net_device *dev,
 102                                                     unsigned int pref);
 103
 104 extern void                     rt6_purge_dflt_routers(struct net *net);
 105
 106 extern int                      rt6_route_rcv(struct net_device *dev,
 107                                               u8 *opt, int len,
 108                                               struct in6_addr *gwaddr);
 109
 110 extern void                     rt6_redirect(struct in6_addr *dest,
 111                                              struct in6_addr *src,
 112                                              struct in6_addr *saddr,
 113                                              struct neighbour *neigh,
 114                                              u8 *lladdr,
 115                                              int on_link);
 116
 117 extern void                     rt6_pmtu_discovery(struct in6_addr *daddr,
 118                                                    struct in6_addr *saddr,
 119                                                    struct net_device *dev,
 120                                                    u32 pmtu);
 121
 122 struct netlink_callback;
 123
 124 struct rt6_rtnl_dump_arg {
 125         struct sk_buff *skb;
 126         struct netlink_callback *cb;
 127         struct net *net;
 128 };
 129
 130 extern int rt6_dump_route(struct rt6_info *rt, void *p_arg);
 131 extern void rt6_ifdown(struct net *net, struct net_device *dev);
 132 extern void rt6_mtu_change(struct net_device *dev, unsigned mtu);
 133
 134
 135 /*
 136  *      Store a destination cache entry in a socket
 137  */
 138 static inline void __ip6_dst_store(struct sock *sk, struct dst_entry *dst,
 139                                    struct in6_addr *daddr, struct in6_addr *saddr)
 140 {
 141         struct ipv6_pinfo *np = inet6_sk(sk);
 142         struct rt6_info *rt = (struct rt6_info *) dst;
 143
 144         sk_setup_caps(sk, dst);
 145         np->daddr_cache = daddr;
 146 #ifdef CONFIG_IPV6_SUBTREES
 147         np->saddr_cache = saddr;
 148 #endif
 149         np->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
 150 }
 151
 152 static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
 153                                  struct in6_addr *daddr, struct in6_addr *saddr)
 154 {
 155         spin_lock(&sk->sk_dst_lock);
 156         __ip6_dst_store(sk, dst, daddr, saddr);
 157         spin_unlock(&sk->sk_dst_lock);
 158 }
 159
 160 static inline int ipv6_unicast_destination(struct sk_buff *skb)
 161 {
 162         struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
 163
 164         return rt->rt6i_flags & RTF_LOCAL;
 165 }
 166
 167 int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
 168
 169 static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
 170 {
 171         struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL;
 172
 173         return (np && np->pmtudisc == IPV6_PMTUDISC_PROBE) ?
 174                skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
 175 }
 176
 177 #endif
 178 #endif