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 /* We do not (yet ?) support IPv6 jumbograms (RFC 2675)
  38  * Unlike IPv4, hdr->seg_len doesn't include the IPv6 header
  39  */
  40 #define IP6_MAX_MTU (0xFFFF + sizeof(struct ipv6hdr))
  41
  42 /*
  43  * rt6_srcprefs2flags() and rt6_flags2srcprefs() translate
  44  * between IPV6_ADDR_PREFERENCES socket option values
  45  *      IPV6_PREFER_SRC_TMP    = 0x1
  46  *      IPV6_PREFER_SRC_PUBLIC = 0x2
  47  *      IPV6_PREFER_SRC_COA    = 0x4
  48  * and above RT6_LOOKUP_F_SRCPREF_xxx flags.
  49  */
  50 static inline int rt6_srcprefs2flags(unsigned int srcprefs)
  51 {
  52         /* No need to bitmask because srcprefs have only 3 bits. */
  53         return srcprefs << 3;
  54 }
  55
  56 static inline unsigned int rt6_flags2srcprefs(int flags)
  57 {
  58         return (flags >> 3) & 7;
  59 }
  60
  61 extern void                     rt6_bind_peer(struct rt6_info *rt,
  62                                               int create);
  63
  64 static inline struct inet_peer *rt6_get_peer(struct rt6_info *rt)
  65 {
  66         if (rt->rt6i_peer)
  67                 return rt->rt6i_peer;
  68
  69         rt6_bind_peer(rt, 0);
  70         return rt->rt6i_peer;
  71 }
  72
  73 extern void                     ip6_route_input(struct sk_buff *skb);
  74
  75 extern struct dst_entry *       ip6_route_output(struct net *net,
  76                                                  const struct sock *sk,
  77                                                  struct flowi6 *fl6);
  78
  79 extern int                      ip6_route_init(void);
  80 extern void                     ip6_route_cleanup(void);
  81
  82 extern int                      ipv6_route_ioctl(struct net *net,
  83                                                  unsigned int cmd,
  84                                                  void __user *arg);
  85
  86 extern int                      ip6_route_add(struct fib6_config *cfg);
  87 extern int                      ip6_ins_rt(struct rt6_info *);
  88 extern int                      ip6_del_rt(struct rt6_info *);
  89
  90 extern int                      ip6_route_get_saddr(struct net *net,
  91                                                     struct rt6_info *rt,
  92                                                     const struct in6_addr *daddr,
  93                                                     unsigned int prefs,
  94                                                     struct in6_addr *saddr);
  95
  96 extern struct rt6_info          *rt6_lookup(struct net *net,
  97                                             const struct in6_addr *daddr,
  98                                             const struct in6_addr *saddr,
  99                                             int oif, int flags);
 100
 101 extern struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
 102                                          struct neighbour *neigh,
 103                                          const struct in6_addr *addr);
 104 extern int icmp6_dst_gc(void);
 105
 106 extern void fib6_force_start_gc(struct net *net);
 107
 108 extern struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
 109                                            const struct in6_addr *addr,
 110                                            int anycast);
 111
 112 extern int                      ip6_dst_hoplimit(struct dst_entry *dst);
 113
 114 /*
 115  *      support functions for ND
 116  *
 117  */
 118 extern struct rt6_info *        rt6_get_dflt_router(const struct in6_addr *addr,
 119                                                     struct net_device *dev);
 120 extern struct rt6_info *        rt6_add_dflt_router(const struct in6_addr *gwaddr,
 121                                                     struct net_device *dev,
 122                                                     unsigned int pref);
 123
 124 extern void                     rt6_purge_dflt_routers(struct net *net);
 125
 126 extern int                      rt6_route_rcv(struct net_device *dev,
 127                                               u8 *opt, int len,
 128                                               const struct in6_addr *gwaddr);
 129
 130 extern void                     rt6_redirect(const struct in6_addr *dest,
 131                                              const struct in6_addr *src,
 132                                              const struct in6_addr *saddr,
 133                                              struct neighbour *neigh,
 134                                              u8 *lladdr,
 135                                              int on_link);
 136
 137 extern void                     rt6_pmtu_discovery(const struct in6_addr *daddr,
 138                                                    const struct in6_addr *saddr,
 139                                                    struct net_device *dev,
 140                                                    u32 pmtu);
 141
 142 struct netlink_callback;
 143
 144 struct rt6_rtnl_dump_arg {
 145         struct sk_buff *skb;
 146         struct netlink_callback *cb;
 147         struct net *net;
 148 };
 149
 150 extern int rt6_dump_route(struct rt6_info *rt, void *p_arg);
 151 extern void rt6_ifdown(struct net *net, struct net_device *dev);
 152 extern void rt6_mtu_change(struct net_device *dev, unsigned mtu);
 153 extern void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
 154
 155
 156 /*
 157  *      Store a destination cache entry in a socket
 158  */
 159 static inline void __ip6_dst_store(struct sock *sk, struct dst_entry *dst,
 160                                    struct in6_addr *daddr, struct in6_addr *saddr)
 161 {
 162         struct ipv6_pinfo *np = inet6_sk(sk);
 163         struct rt6_info *rt = (struct rt6_info *) dst;
 164
 165         sk_setup_caps(sk, dst);
 166         np->daddr_cache = daddr;
 167 #ifdef CONFIG_IPV6_SUBTREES
 168         np->saddr_cache = saddr;
 169 #endif
 170         np->dst_cookie = rt6_get_cookie(rt);
 171 }
 172
 173 static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
 174                                  struct in6_addr *daddr, struct in6_addr *saddr)
 175 {
 176         spin_lock(&sk->sk_dst_lock);
 177         __ip6_dst_store(sk, dst, daddr, saddr);
 178         spin_unlock(&sk->sk_dst_lock);
 179 }
 180
 181 static inline int ipv6_unicast_destination(struct sk_buff *skb)
 182 {
 183         struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
 184
 185         return rt->rt6i_flags & RTF_LOCAL;
 186 }
 187
 188 int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
 189
 190 static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
 191 {
 192         struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL;
 193
 194         return (np && np->pmtudisc == IPV6_PMTUDISC_PROBE) ?
 195                skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
 196 }
 197
 198 #endif