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 /* We do not (yet ?) support IPv6 jumbograms (RFC 2675)
  36  * Unlike IPv4, hdr->seg_len doesn't include the IPv6 header
  37  */
  38 #define IP6_MAX_MTU (0xFFFF + sizeof(struct ipv6hdr))
  39
  40 /*
  41  * rt6_srcprefs2flags() and rt6_flags2srcprefs() translate
  42  * between IPV6_ADDR_PREFERENCES socket option values
  43  *      IPV6_PREFER_SRC_TMP    = 0x1
  44  *      IPV6_PREFER_SRC_PUBLIC = 0x2
  45  *      IPV6_PREFER_SRC_COA    = 0x4
  46  * and above RT6_LOOKUP_F_SRCPREF_xxx flags.
  47  */
  48 static inline int rt6_srcprefs2flags(unsigned int srcprefs)
  49 {
  50         /* No need to bitmask because srcprefs have only 3 bits. */
  51         return srcprefs << 3;
  52 }
  53
  54 static inline unsigned int rt6_flags2srcprefs(int flags)
  55 {
  56         return (flags >> 3) & 7;
  57 }
  58
  59 extern void rt6_bind_peer(struct rt6_info *rt, int create);
  60
  61 static inline struct inet_peer *__rt6_get_peer(struct rt6_info *rt, int create)
  62 {
  63         if (rt6_has_peer(rt))
  64                 return rt6_peer_ptr(rt);
  65
  66         rt6_bind_peer(rt, create);
  67         return (rt6_has_peer(rt) ? rt6_peer_ptr(rt) : NULL);
  68 }
  69
  70 static inline struct inet_peer *rt6_get_peer(struct rt6_info *rt)
  71 {
  72         return __rt6_get_peer(rt, 0);
  73 }
  74
  75 static inline struct inet_peer *rt6_get_peer_create(struct rt6_info *rt)
  76 {
  77         return __rt6_get_peer(rt, 1);
  78 }
  79
  80 extern void                     ip6_route_input(struct sk_buff *skb);
  81
  82 extern struct dst_entry *       ip6_route_output(struct net *net,
  83                                                  const struct sock *sk,
  84                                                  struct flowi6 *fl6);
  85 extern struct dst_entry *       ip6_route_lookup(struct net *net,
  86                                                  struct flowi6 *fl6, int flags);
  87
  88 extern int                      ip6_route_init(void);
  89 extern void                     ip6_route_cleanup(void);
  90
  91 extern int                      ipv6_route_ioctl(struct net *net,
  92                                                  unsigned int cmd,
  93                                                  void __user *arg);
  94
  95 extern int                      ip6_route_add(struct fib6_config *cfg);
  96 extern int                      ip6_ins_rt(struct rt6_info *);
  97 extern int                      ip6_del_rt(struct rt6_info *);
  98
  99 extern int                      ip6_route_get_saddr(struct net *net,
 100                                                     struct rt6_info *rt,
 101                                                     const struct in6_addr *daddr,
 102                                                     unsigned int prefs,
 103                                                     struct in6_addr *saddr);
 104
 105 extern struct rt6_info          *rt6_lookup(struct net *net,
 106                                             const struct in6_addr *daddr,
 107                                             const struct in6_addr *saddr,
 108                                             int oif, int flags);
 109
 110 extern struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
 111                                          struct flowi6 *fl6);
 112 extern int icmp6_dst_gc(void);
 113
 114 extern void fib6_force_start_gc(struct net *net);
 115
 116 extern struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
 117                                            const struct in6_addr *addr,
 118                                            bool anycast);
 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_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
 142                                    u32 mark);
 143 extern void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk);
 144
 145 struct netlink_callback;
 146
 147 struct rt6_rtnl_dump_arg {
 148         struct sk_buff *skb;
 149         struct netlink_callback *cb;
 150         struct net *net;
 151 };
 152
 153 extern int rt6_dump_route(struct rt6_info *rt, void *p_arg);
 154 extern void rt6_ifdown(struct net *net, struct net_device *dev);
 155 extern void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
 156 extern void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
 157
 158
 159 /*
 160  *      Store a destination cache entry in a socket
 161  */
 162 static inline void __ip6_dst_store(struct sock *sk, struct dst_entry *dst,
 163                                    const struct in6_addr *daddr,
 164                                    const struct in6_addr *saddr)
 165 {
 166         struct ipv6_pinfo *np = inet6_sk(sk);
 167         struct rt6_info *rt = (struct rt6_info *) dst;
 168
 169         sk_setup_caps(sk, dst);
 170         np->daddr_cache = daddr;
 171 #ifdef CONFIG_IPV6_SUBTREES
 172         np->saddr_cache = saddr;
 173 #endif
 174         np->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
 175 }
 176
 177 static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
 178                                  struct in6_addr *daddr, struct in6_addr *saddr)
 179 {
 180         spin_lock(&sk->sk_dst_lock);
 181         __ip6_dst_store(sk, dst, daddr, saddr);
 182         spin_unlock(&sk->sk_dst_lock);
 183 }
 184
 185 static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
 186 {
 187         struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
 188
 189         return rt->rt6i_flags & RTF_LOCAL;
 190 }
 191
 192 int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
 193
 194 static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
 195 {
 196         struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL;
 197
 198         return (np && np->pmtudisc == IPV6_PMTUDISC_PROBE) ?
 199                skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
 200 }
 201
 202 static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt)
 203 {
 204         return &rt->rt6i_gateway;
 205 }
 206
 207 #endif