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, int create);
  57
  58 static inline struct inet_peer *__rt6_get_peer(struct rt6_info *rt, int create)
  59 {
  60         if (rt6_has_peer(rt))
  61                 return rt6_peer_ptr(rt);
  62
  63         rt6_bind_peer(rt, create);
  64         return (rt6_has_peer(rt) ? rt6_peer_ptr(rt) : NULL);
  65 }
  66
  67 static inline struct inet_peer *rt6_get_peer(struct rt6_info *rt)
  68 {
  69         return __rt6_get_peer(rt, 0);
  70 }
  71
  72 static inline struct inet_peer *rt6_get_peer_create(struct rt6_info *rt)
  73 {
  74         return __rt6_get_peer(rt, 1);
  75 }
  76
  77 extern void                     ip6_route_input(struct sk_buff *skb);
  78
  79 extern struct dst_entry *       ip6_route_output(struct net *net,
  80                                                  const struct sock *sk,
  81                                                  struct flowi6 *fl6);
  82 extern struct dst_entry *       ip6_route_lookup(struct net *net,
  83                                                  struct flowi6 *fl6, int flags);
  84
  85 extern int                      ip6_route_init(void);
  86 extern void                     ip6_route_cleanup(void);
  87
  88 extern int                      ipv6_route_ioctl(struct net *net,
  89                                                  unsigned int cmd,
  90                                                  void __user *arg);
  91
  92 extern int                      ip6_route_add(struct fib6_config *cfg);
  93 extern int                      ip6_ins_rt(struct rt6_info *);
  94 extern int                      ip6_del_rt(struct rt6_info *);
  95
  96 extern int                      ip6_route_get_saddr(struct net *net,
  97                                                     struct rt6_info *rt,
  98                                                     const struct in6_addr *daddr,
  99                                                     unsigned int prefs,
 100                                                     struct in6_addr *saddr);
 101
 102 extern struct rt6_info          *rt6_lookup(struct net *net,
 103                                             const struct in6_addr *daddr,
 104                                             const struct in6_addr *saddr,
 105                                             int oif, int flags);
 106
 107 extern struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
 108                                          struct neighbour *neigh,
 109                                          struct flowi6 *fl6);
 110 extern int icmp6_dst_gc(void);
 111
 112 extern void fib6_force_start_gc(struct net *net);
 113
 114 extern struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
 115                                            const struct in6_addr *addr,
 116                                            bool anycast);
 117
 118 extern int                      ip6_dst_hoplimit(struct dst_entry *dst);
 119
 120 /*
 121  *      support functions for ND
 122  *
 123  */
 124 extern struct rt6_info *        rt6_get_dflt_router(const struct in6_addr *addr,
 125                                                     struct net_device *dev);
 126 extern struct rt6_info *        rt6_add_dflt_router(const struct in6_addr *gwaddr,
 127                                                     struct net_device *dev,
 128                                                     unsigned int pref);
 129
 130 extern void                     rt6_purge_dflt_routers(struct net *net);
 131
 132 extern int                      rt6_route_rcv(struct net_device *dev,
 133                                               u8 *opt, int len,
 134                                               const struct in6_addr *gwaddr);
 135
 136 extern void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
 137                             int oif, u32 mark);
 138 extern void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk,
 139                                __be32 mtu);
 140 extern void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark);
 141 extern void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk);
 142
 143 struct netlink_callback;
 144
 145 struct rt6_rtnl_dump_arg {
 146         struct sk_buff *skb;
 147         struct netlink_callback *cb;
 148         struct net *net;
 149 };
 150
 151 extern int rt6_dump_route(struct rt6_info *rt, void *p_arg);
 152 extern void rt6_ifdown(struct net *net, struct net_device *dev);
 153 extern void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
 154 extern void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
 155
 156
 157 /*
 158  *      Store a destination cache entry in a socket
 159  */
 160 static inline void __ip6_dst_store(struct sock *sk, struct dst_entry *dst,
 161                                    const struct in6_addr *daddr,
 162                                    const struct in6_addr *saddr)
 163 {
 164         struct ipv6_pinfo *np = inet6_sk(sk);
 165         struct rt6_info *rt = (struct rt6_info *) dst;
 166
 167         sk_setup_caps(sk, dst);
 168         np->daddr_cache = daddr;
 169 #ifdef CONFIG_IPV6_SUBTREES
 170         np->saddr_cache = saddr;
 171 #endif
 172         np->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
 173 }
 174
 175 static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
 176                                  struct in6_addr *daddr, struct in6_addr *saddr)
 177 {
 178         spin_lock(&sk->sk_dst_lock);
 179         __ip6_dst_store(sk, dst, daddr, saddr);
 180         spin_unlock(&sk->sk_dst_lock);
 181 }
 182
 183 static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
 184 {
 185         struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
 186
 187         return rt->rt6i_flags & RTF_LOCAL;
 188 }
 189
 190 int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
 191
 192 static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
 193 {
 194         struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL;
 195
 196         return (np && np->pmtudisc == IPV6_PMTUDISC_PROBE) ?
 197                skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
 198 }
 199
 200 #endif