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 static inline bool rt6_need_strict(const struct in6_addr *daddr)
  60 {
  61         return ipv6_addr_type(daddr) &
  62                 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
  63 }
  64
  65 void ip6_route_input(struct sk_buff *skb);
  66
  67 struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
  68                                          struct flowi6 *fl6, int flags);
  69
  70 static inline struct dst_entry *ip6_route_output(struct net *net,
  71                                                  const struct sock *sk,
  72                                                  struct flowi6 *fl6)
  73 {
  74         return ip6_route_output_flags(net, sk, fl6, 0);
  75 }
  76
  77 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
  78                                    int flags);
  79
  80 int ip6_route_init(void);
  81 void ip6_route_cleanup(void);
  82
  83 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg);
  84
  85 int ip6_route_add(struct fib6_config *cfg);
  86 int ip6_ins_rt(struct rt6_info *);
  87 int ip6_del_rt(struct rt6_info *);
  88
  89 int ip6_route_get_saddr(struct net *net, struct rt6_info *rt,
  90                         const struct in6_addr *daddr, unsigned int prefs,
  91                         struct in6_addr *saddr);
  92
  93 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
  94                             const struct in6_addr *saddr, int oif, int flags);
  95
  96 struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6);
  97 int icmp6_dst_gc(void);
  98
  99 void fib6_force_start_gc(struct net *net);
 100
 101 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
 102                                     const struct in6_addr *addr, bool anycast);
 103
 104 struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
 105                                int flags);
 106
 107 /*
 108  *      support functions for ND
 109  *
 110  */
 111 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr,
 112                                      struct net_device *dev);
 113 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
 114                                      struct net_device *dev, unsigned int pref);
 115
 116 void rt6_purge_dflt_routers(struct net *net);
 117
 118 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
 119                   const struct in6_addr *gwaddr);
 120
 121 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif,
 122                      u32 mark);
 123 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu);
 124 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark);
 125 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
 126                             u32 mark);
 127 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk);
 128
 129 struct netlink_callback;
 130
 131 struct rt6_rtnl_dump_arg {
 132         struct sk_buff *skb;
 133         struct netlink_callback *cb;
 134         struct net *net;
 135 };
 136
 137 int rt6_dump_route(struct rt6_info *rt, void *p_arg);
 138 void rt6_ifdown(struct net *net, struct net_device *dev);
 139 void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
 140 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
 141 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway);
 142
 143
 144 /*
 145  *      Store a destination cache entry in a socket
 146  */
 147 static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
 148                                  const struct in6_addr *daddr,
 149                                  const struct in6_addr *saddr)
 150 {
 151         struct ipv6_pinfo *np = inet6_sk(sk);
 152
 153         np->dst_cookie = rt6_get_cookie((struct rt6_info *)dst);
 154         sk_setup_caps(sk, dst);
 155         np->daddr_cache = daddr;
 156 #ifdef CONFIG_IPV6_SUBTREES
 157         np->saddr_cache = saddr;
 158 #endif
 159 }
 160
 161 static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
 162 {
 163         struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
 164
 165         return rt->rt6i_flags & RTF_LOCAL;
 166 }
 167
 168 static inline bool ipv6_anycast_destination(const struct dst_entry *dst,
 169                                             const struct in6_addr *daddr)
 170 {
 171         struct rt6_info *rt = (struct rt6_info *)dst;
 172
 173         return rt->rt6i_flags & RTF_ANYCAST ||
 174                 (rt->rt6i_dst.plen != 128 &&
 175                  ipv6_addr_equal(&rt->rt6i_dst.addr, daddr));
 176 }
 177
 178 int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
 179                  int (*output)(struct net *, struct sock *, struct sk_buff *));
 180
 181 static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
 182 {
 183         struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?
 184                                 inet6_sk(skb->sk) : NULL;
 185
 186         return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ?
 187                skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
 188 }
 189
 190 static inline bool ip6_sk_accept_pmtu(const struct sock *sk)
 191 {
 192         return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE &&
 193                inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT;
 194 }
 195
 196 static inline bool ip6_sk_ignore_df(const struct sock *sk)
 197 {
 198         return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO ||
 199                inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT;
 200 }
 201
 202 static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt,
 203                                            struct in6_addr *daddr)
 204 {
 205         if (rt->rt6i_flags & RTF_GATEWAY)
 206                 return &rt->rt6i_gateway;
 207         else if (unlikely(rt->rt6i_flags & RTF_CACHE))
 208                 return &rt->rt6i_dst.addr;
 209         else
 210                 return daddr;
 211 }
 212
 213 #endif