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                                          struct flowi6 *fl6);
  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                                            bool 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