include/net/ip6_route.h

   1 #ifndef _NET_IP6_ROUTE_H
   2 #define _NET_IP6_ROUTE_H
   3
   4 struct route_info {
   5         __u8                    type;
   6         __u8                    length;
   7         __u8                    prefix_len;
   8 #if defined(__BIG_ENDIAN_BITFIELD)
   9         __u8                    reserved_h:3,
  10                                 route_pref:2,
  11                                 reserved_l:3;
  12 #elif defined(__LITTLE_ENDIAN_BITFIELD)
  13         __u8                    reserved_l:3,
  14                                 route_pref:2,
  15                                 reserved_h:3;
  16 #endif
  17         __be32                  lifetime;
  18         __u8                    prefix[0];      /* 0,8 or 16 */
  19 };
  20
  21 #include <net/flow.h>
  22 #include <net/ip6_fib.h>
  23 #include <net/sock.h>
  24 #include <linux/ip.h>
  25 #include <linux/ipv6.h>
  26 #include <linux/route.h>
  27
  28 #define RT6_LOOKUP_F_IFACE              0x00000001
  29 #define RT6_LOOKUP_F_REACHABLE          0x00000002
  30 #define RT6_LOOKUP_F_HAS_SADDR          0x00000004
  31 #define RT6_LOOKUP_F_SRCPREF_TMP        0x00000008
  32 #define RT6_LOOKUP_F_SRCPREF_PUBLIC     0x00000010
  33 #define RT6_LOOKUP_F_SRCPREF_COA        0x00000020
  34
  35 /*
  36  * rt6_srcprefs2flags() and rt6_flags2srcprefs() translate
  37  * between IPV6_ADDR_PREFERENCES socket option values
  38  *      IPV6_PREFER_SRC_TMP    = 0x1
  39  *      IPV6_PREFER_SRC_PUBLIC = 0x2
  40  *      IPV6_PREFER_SRC_COA    = 0x4
  41  * and above RT6_LOOKUP_F_SRCPREF_xxx flags.
  42  */
  43 static inline int rt6_srcprefs2flags(unsigned int srcprefs)
  44 {
  45         /* No need to bitmask because srcprefs have only 3 bits. */
  46         return srcprefs << 3;
  47 }
  48
  49 static inline unsigned int rt6_flags2srcprefs(int flags)
  50 {
  51         return (flags >> 3) & 7;
  52 }
  53
  54 extern void rt6_bind_peer(struct rt6_info *rt, int create);
  55
  56 static inline struct inet_peer *__rt6_get_peer(struct rt6_info *rt, int create)
  57 {
  58         if (rt6_has_peer(rt))
  59                 return rt6_peer_ptr(rt);
  60
  61         rt6_bind_peer(rt, create);
  62         return (rt6_has_peer(rt) ? rt6_peer_ptr(rt) : NULL);
  63 }
  64
  65 static inline struct inet_peer *rt6_get_peer(struct rt6_info *rt)
  66 {
  67         return __rt6_get_peer(rt, 0);
  68 }
  69
  70 static inline struct inet_peer *rt6_get_peer_create(struct rt6_info *rt)
  71 {
  72         return __rt6_get_peer(rt, 1);
  73 }
  74
  75 extern void                     ip6_route_input(struct sk_buff *skb);
  76
  77 extern struct dst_entry *       ip6_route_output(struct net *net,
  78                                                  const struct sock *sk,
  79                                                  struct flowi6 *fl6);
  80 extern struct dst_entry *       ip6_route_lookup(struct net *net,
  81                                                  struct flowi6 *fl6, int flags);
  82
  83 extern int                      ip6_route_init(void);
  84 extern void                     ip6_route_cleanup(void);
  85
  86 extern int                      ipv6_route_ioctl(struct net *net,
  87                                                  unsigned int cmd,
  88                                                  void __user *arg);
  89
  90 extern int                      ip6_route_add(struct fib6_config *cfg);
  91 extern int                      ip6_ins_rt(struct rt6_info *);
  92 extern int                      ip6_del_rt(struct rt6_info *);
  93
  94 extern int                      ip6_route_get_saddr(struct net *net,
  95                                                     struct rt6_info *rt,
  96                                                     const struct in6_addr *daddr,
  97                                                     unsigned int prefs,
  98                                                     struct in6_addr *saddr);
  99
 100 extern struct rt6_info          *rt6_lookup(struct net *net,
 101                                             const struct in6_addr *daddr,
 102                                             const struct in6_addr *saddr,
 103                                             int oif, int flags);
 104
 105 extern struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
 106                                          struct flowi6 *fl6);
 107 extern int icmp6_dst_gc(void);
 108
 109 extern void fib6_force_start_gc(struct net *net);
 110
 111 extern struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
 112                                            const struct in6_addr *addr,
 113                                            bool anycast);
 114
 115 extern int                      ip6_dst_hoplimit(struct dst_entry *dst);
 116
 117 /*
 118  *      support functions for ND
 119  *
 120  */
 121 extern struct rt6_info *        rt6_get_dflt_router(const struct in6_addr *addr,
 122                                                     struct net_device *dev);
 123 extern struct rt6_info *        rt6_add_dflt_router(const struct in6_addr *gwaddr,
 124                                                     struct net_device *dev,
 125                                                     unsigned int pref);
 126
 127 extern void                     rt6_purge_dflt_routers(struct net *net);
 128
 129 extern int                      rt6_route_rcv(struct net_device *dev,
 130                                               u8 *opt, int len,
 131                                               const struct in6_addr *gwaddr);
 132
 133 extern void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
 134                             int oif, u32 mark);
 135 extern void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk,
 136                                __be32 mtu);
 137 extern void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark);
 138 extern void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk);
 139
 140 struct netlink_callback;
 141
 142 struct rt6_rtnl_dump_arg {
 143         struct sk_buff *skb;
 144         struct netlink_callback *cb;
 145         struct net *net;
 146 };
 147
 148 extern int rt6_dump_route(struct rt6_info *rt, void *p_arg);
 149 extern void rt6_ifdown(struct net *net, struct net_device *dev);
 150 extern void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
 151 extern void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
 152
 153
 154 /*
 155  *      Store a destination cache entry in a socket
 156  */
 157 static inline void __ip6_dst_store(struct sock *sk, struct dst_entry *dst,
 158                                    const struct in6_addr *daddr,
 159                                    const struct in6_addr *saddr)
 160 {
 161         struct ipv6_pinfo *np = inet6_sk(sk);
 162         struct rt6_info *rt = (struct rt6_info *) dst;
 163
 164         sk_setup_caps(sk, dst);
 165         np->daddr_cache = daddr;
 166 #ifdef CONFIG_IPV6_SUBTREES
 167         np->saddr_cache = saddr;
 168 #endif
 169         np->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
 170 }
 171
 172 static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
 173                                  struct in6_addr *daddr, struct in6_addr *saddr)
 174 {
 175         spin_lock(&sk->sk_dst_lock);
 176         __ip6_dst_store(sk, dst, daddr, saddr);
 177         spin_unlock(&sk->sk_dst_lock);
 178 }
 179
 180 static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
 181 {
 182         struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
 183
 184         return rt->rt6i_flags & RTF_LOCAL;
 185 }
 186
 187 int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
 188
 189 static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
 190 {
 191         struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL;
 192
 193         return (np && np->pmtudisc == IPV6_PMTUDISC_PROBE) ?
 194                skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
 195 }
 196
 197 static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt, struct in6_addr *dest)
 198 {
 199         if (rt->rt6i_flags & RTF_GATEWAY)
 200                 return &rt->rt6i_gateway;
 201         return dest;
 202 }
 203
 204 #endif