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 extern struct dst_entry *       ip6_route_lookup(struct net *net,
  74                                                  struct flowi6 *fl6, int flags);
  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 int                      ip6_route_get_saddr(struct net *net,
  88                                                     struct rt6_info *rt,
  89                                                     const struct in6_addr *daddr,
  90                                                     unsigned int prefs,
  91                                                     struct in6_addr *saddr);
  92
  93 extern struct rt6_info          *rt6_lookup(struct net *net,
  94                                             const struct in6_addr *daddr,
  95                                             const struct in6_addr *saddr,
  96                                             int oif, int flags);
  97
  98 extern struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
  99                                          struct neighbour *neigh,
 100                                          struct flowi6 *fl6);
 101 extern int icmp6_dst_gc(void);
 102
 103 extern void fib6_force_start_gc(struct net *net);
 104
 105 extern struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
 106                                            const struct in6_addr *addr,
 107                                            bool anycast);
 108
 109 extern int                      ip6_dst_hoplimit(struct dst_entry *dst);
 110
 111 /*
 112  *      support functions for ND
 113  *
 114  */
 115 extern struct rt6_info *        rt6_get_dflt_router(const struct in6_addr *addr,
 116                                                     struct net_device *dev);
 117 extern struct rt6_info *        rt6_add_dflt_router(const struct in6_addr *gwaddr,
 118                                                     struct net_device *dev,
 119                                                     unsigned int pref);
 120
 121 extern void                     rt6_purge_dflt_routers(struct net *net);
 122
 123 extern int                      rt6_route_rcv(struct net_device *dev,
 124                                               u8 *opt, int len,
 125                                               const struct in6_addr *gwaddr);
 126
 127 extern void                     rt6_redirect(const struct in6_addr *dest,
 128                                              const struct in6_addr *src,
 129                                              const struct in6_addr *saddr,
 130                                              struct neighbour *neigh,
 131                                              u8 *lladdr,
 132                                              int on_link);
 133
 134 extern void                     rt6_pmtu_discovery(const struct in6_addr *daddr,
 135                                                    const struct in6_addr *saddr,
 136                                                    struct net_device *dev,
 137                                                    u32 pmtu);
 138
 139 struct netlink_callback;
 140
 141 struct rt6_rtnl_dump_arg {
 142         struct sk_buff *skb;
 143         struct netlink_callback *cb;
 144         struct net *net;
 145 };
 146
 147 extern int rt6_dump_route(struct rt6_info *rt, void *p_arg);
 148 extern void rt6_ifdown(struct net *net, struct net_device *dev);
 149 extern void rt6_mtu_change(struct net_device *dev, unsigned mtu);
 150 extern void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
 151
 152
 153 /*
 154  *      Store a destination cache entry in a socket
 155  */
 156 static inline void __ip6_dst_store(struct sock *sk, struct dst_entry *dst,
 157                                    struct in6_addr *daddr, struct in6_addr *saddr)
 158 {
 159         struct ipv6_pinfo *np = inet6_sk(sk);
 160         struct rt6_info *rt = (struct rt6_info *) dst;
 161
 162         sk_setup_caps(sk, dst);
 163         np->daddr_cache = daddr;
 164 #ifdef CONFIG_IPV6_SUBTREES
 165         np->saddr_cache = saddr;
 166 #endif
 167         np->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
 168 }
 169
 170 static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
 171                                  struct in6_addr *daddr, struct in6_addr *saddr)
 172 {
 173         spin_lock(&sk->sk_dst_lock);
 174         __ip6_dst_store(sk, dst, daddr, saddr);
 175         spin_unlock(&sk->sk_dst_lock);
 176 }
 177
 178 static inline int ipv6_unicast_destination(struct sk_buff *skb)
 179 {
 180         struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
 181
 182         return rt->rt6i_flags & RTF_LOCAL;
 183 }
 184
 185 int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
 186
 187 static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
 188 {
 189         struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL;
 190
 191         return (np && np->pmtudisc == IPV6_PMTUDISC_PROBE) ?
 192                skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
 193 }
 194
 195 #endif