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/addrconf.h>
  22 #include <net/flow.h>
  23 #include <net/ip6_fib.h>
  24 #include <net/sock.h>
  25 #include <linux/ip.h>
  26 #include <linux/ipv6.h>
  27 #include <linux/route.h>
  28
  29 #define RT6_LOOKUP_F_IFACE              0x00000001
  30 #define RT6_LOOKUP_F_REACHABLE          0x00000002
  31 #define RT6_LOOKUP_F_HAS_SADDR          0x00000004
  32 #define RT6_LOOKUP_F_SRCPREF_TMP        0x00000008
  33 #define RT6_LOOKUP_F_SRCPREF_PUBLIC     0x00000010
  34 #define RT6_LOOKUP_F_SRCPREF_COA        0x00000020
  35 #define RT6_LOOKUP_F_IGNORE_LINKSTATE   0x00000040
  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 static inline bool rt6_need_strict(const struct in6_addr *daddr)
  62 {
  63         return ipv6_addr_type(daddr) &
  64                 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
  65 }
  66
  67 void ip6_route_input(struct sk_buff *skb);
  68 struct dst_entry *ip6_route_input_lookup(struct net *net,
  69                                          struct net_device *dev,
  70                                          struct flowi6 *fl6, int flags);
  71
  72 struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
  73                                          struct flowi6 *fl6, int flags);
  74
  75 static inline struct dst_entry *ip6_route_output(struct net *net,
  76                                                  const struct sock *sk,
  77                                                  struct flowi6 *fl6)
  78 {
  79         return ip6_route_output_flags(net, sk, fl6, 0);
  80 }
  81
  82 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
  83                                    int flags);
  84 struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
  85                                int ifindex, struct flowi6 *fl6, int flags);
  86
  87 int ip6_route_init(void);
  88 void ip6_route_cleanup(void);
  89
  90 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg);
  91
  92 int ip6_route_add(struct fib6_config *cfg);
  93 int ip6_ins_rt(struct rt6_info *);
  94 int ip6_del_rt(struct rt6_info *);
  95
  96 static inline int ip6_route_get_saddr(struct net *net, struct rt6_info *rt,
  97                                       const struct in6_addr *daddr,
  98                                       unsigned int prefs,
  99                                       struct in6_addr *saddr)
 100 {
 101         struct inet6_dev *idev =
 102                         rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL;
 103         int err = 0;
 104
 105         if (rt && rt->rt6i_prefsrc.plen)
 106                 *saddr = rt->rt6i_prefsrc.addr;
 107         else
 108                 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
 109                                          daddr, prefs, saddr);
 110
 111         return err;
 112 }
 113
 114 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
 115                             const struct in6_addr *saddr, int oif, int flags);
 116
 117 struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6);
 118 int icmp6_dst_gc(void);
 119
 120 void fib6_force_start_gc(struct net *net);
 121
 122 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
 123                                     const struct in6_addr *addr, bool anycast);
 124
 125 struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
 126                                int flags);
 127
 128 /*
 129  *      support functions for ND
 130  *
 131  */
 132 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr,
 133                                      struct net_device *dev);
 134 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
 135                                      struct net_device *dev, unsigned int pref);
 136
 137 void rt6_purge_dflt_routers(struct net *net);
 138
 139 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
 140                   const struct in6_addr *gwaddr);
 141
 142 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif,
 143                      u32 mark);
 144 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu);
 145 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark);
 146 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
 147                             u32 mark);
 148 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk);
 149
 150 struct netlink_callback;
 151
 152 struct rt6_rtnl_dump_arg {
 153         struct sk_buff *skb;
 154         struct netlink_callback *cb;
 155         struct net *net;
 156 };
 157
 158 int rt6_dump_route(struct rt6_info *rt, void *p_arg);
 159 void rt6_ifdown(struct net *net, struct net_device *dev);
 160 void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
 161 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
 162 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway);
 163
 164
 165 /*
 166  *      Store a destination cache entry in a socket
 167  */
 168 static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
 169                                  const struct in6_addr *daddr,
 170                                  const struct in6_addr *saddr)
 171 {
 172         struct ipv6_pinfo *np = inet6_sk(sk);
 173
 174         np->dst_cookie = rt6_get_cookie((struct rt6_info *)dst);
 175         sk_setup_caps(sk, dst);
 176         np->daddr_cache = daddr;
 177 #ifdef CONFIG_IPV6_SUBTREES
 178         np->saddr_cache = saddr;
 179 #endif
 180 }
 181
 182 static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
 183 {
 184         struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
 185
 186         return rt->rt6i_flags & RTF_LOCAL;
 187 }
 188
 189 static inline bool ipv6_anycast_destination(const struct dst_entry *dst,
 190                                             const struct in6_addr *daddr)
 191 {
 192         struct rt6_info *rt = (struct rt6_info *)dst;
 193
 194         return rt->rt6i_flags & RTF_ANYCAST ||
 195                 (rt->rt6i_dst.plen != 128 &&
 196                  ipv6_addr_equal(&rt->rt6i_dst.addr, daddr));
 197 }
 198
 199 int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
 200                  int (*output)(struct net *, struct sock *, struct sk_buff *));
 201
 202 static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
 203 {
 204         struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?
 205                                 inet6_sk(skb->sk) : NULL;
 206
 207         return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ?
 208                skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
 209 }
 210
 211 static inline bool ip6_sk_accept_pmtu(const struct sock *sk)
 212 {
 213         return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE &&
 214                inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT;
 215 }
 216
 217 static inline bool ip6_sk_ignore_df(const struct sock *sk)
 218 {
 219         return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO ||
 220                inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT;
 221 }
 222
 223 static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt,
 224                                            struct in6_addr *daddr)
 225 {
 226         if (rt->rt6i_flags & RTF_GATEWAY)
 227                 return &rt->rt6i_gateway;
 228         else if (unlikely(rt->rt6i_flags & RTF_CACHE))
 229                 return &rt->rt6i_dst.addr;
 230         else
 231                 return daddr;
 232 }
 233
 234 #endif