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
  36 /* We do not (yet ?) support IPv6 jumbograms (RFC 2675)
  37  * Unlike IPv4, hdr->seg_len doesn't include the IPv6 header
  38  */
  39 #define IP6_MAX_MTU (0xFFFF + sizeof(struct ipv6hdr))
  40
  41 /*
  42  * rt6_srcprefs2flags() and rt6_flags2srcprefs() translate
  43  * between IPV6_ADDR_PREFERENCES socket option values
  44  *      IPV6_PREFER_SRC_TMP    = 0x1
  45  *      IPV6_PREFER_SRC_PUBLIC = 0x2
  46  *      IPV6_PREFER_SRC_COA    = 0x4
  47  * and above RT6_LOOKUP_F_SRCPREF_xxx flags.
  48  */
  49 static inline int rt6_srcprefs2flags(unsigned int srcprefs)
  50 {
  51         /* No need to bitmask because srcprefs have only 3 bits. */
  52         return srcprefs << 3;
  53 }
  54
  55 static inline unsigned int rt6_flags2srcprefs(int flags)
  56 {
  57         return (flags >> 3) & 7;
  58 }
  59
  60 static inline bool rt6_need_strict(const struct in6_addr *daddr)
  61 {
  62         return ipv6_addr_type(daddr) &
  63                 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
  64 }
  65
  66 void ip6_route_input(struct sk_buff *skb);
  67
  68 struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
  69                                          struct flowi6 *fl6, int flags);
  70
  71 static inline struct dst_entry *ip6_route_output(struct net *net,
  72                                                  const struct sock *sk,
  73                                                  struct flowi6 *fl6)
  74 {
  75         return ip6_route_output_flags(net, sk, fl6, 0);
  76 }
  77
  78 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
  79                                    int flags);
  80 struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
  81                                int ifindex, struct flowi6 *fl6, int flags);
  82
  83 int ip6_route_init(void);
  84 void ip6_route_cleanup(void);
  85
  86 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg);
  87
  88 int ip6_route_add(struct fib6_config *cfg);
  89 int ip6_ins_rt(struct rt6_info *);
  90 int ip6_del_rt(struct rt6_info *);
  91
  92 static inline int ip6_route_get_saddr(struct net *net, struct rt6_info *rt,
  93                                       const struct in6_addr *daddr,
  94                                       unsigned int prefs,
  95                                       struct in6_addr *saddr)
  96 {
  97         struct inet6_dev *idev =
  98                         rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL;
  99         int err = 0;
 100
 101         if (rt && rt->rt6i_prefsrc.plen)
 102                 *saddr = rt->rt6i_prefsrc.addr;
 103         else
 104                 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
 105                                          daddr, prefs, saddr);
 106
 107         return err;
 108 }
 109
 110 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
 111                             const struct in6_addr *saddr, int oif, int flags);
 112
 113 struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6);
 114 int icmp6_dst_gc(void);
 115
 116 void fib6_force_start_gc(struct net *net);
 117
 118 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
 119                                     const struct in6_addr *addr, bool anycast);
 120
 121 struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
 122                                int flags);
 123
 124 /*
 125  *      support functions for ND
 126  *
 127  */
 128 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr,
 129                                      struct net_device *dev);
 130 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
 131                                      struct net_device *dev, unsigned int pref);
 132
 133 void rt6_purge_dflt_routers(struct net *net);
 134
 135 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
 136                   const struct in6_addr *gwaddr);
 137
 138 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif,
 139                      u32 mark);
 140 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu);
 141 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark);
 142 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
 143                             u32 mark);
 144 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk);
 145
 146 struct netlink_callback;
 147
 148 struct rt6_rtnl_dump_arg {
 149         struct sk_buff *skb;
 150         struct netlink_callback *cb;
 151         struct net *net;
 152 };
 153
 154 int rt6_dump_route(struct rt6_info *rt, void *p_arg);
 155 void rt6_ifdown(struct net *net, struct net_device *dev);
 156 void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
 157 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
 158 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway);
 159
 160
 161 /*
 162  *      Store a destination cache entry in a socket
 163  */
 164 static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
 165                                  const struct in6_addr *daddr,
 166                                  const struct in6_addr *saddr)
 167 {
 168         struct ipv6_pinfo *np = inet6_sk(sk);
 169
 170         np->dst_cookie = rt6_get_cookie((struct rt6_info *)dst);
 171         sk_setup_caps(sk, dst);
 172         np->daddr_cache = daddr;
 173 #ifdef CONFIG_IPV6_SUBTREES
 174         np->saddr_cache = saddr;
 175 #endif
 176 }
 177
 178 static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
 179 {
 180         struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
 181
 182         return rt->rt6i_flags & RTF_LOCAL;
 183 }
 184
 185 static inline bool ipv6_anycast_destination(const struct dst_entry *dst,
 186                                             const struct in6_addr *daddr)
 187 {
 188         struct rt6_info *rt = (struct rt6_info *)dst;
 189
 190         return rt->rt6i_flags & RTF_ANYCAST ||
 191                 (rt->rt6i_dst.plen != 128 &&
 192                  ipv6_addr_equal(&rt->rt6i_dst.addr, daddr));
 193 }
 194
 195 int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
 196                  int (*output)(struct net *, struct sock *, struct sk_buff *));
 197
 198 static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
 199 {
 200         struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?
 201                                 inet6_sk(skb->sk) : NULL;
 202
 203         return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ?
 204                skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
 205 }
 206
 207 static inline bool ip6_sk_accept_pmtu(const struct sock *sk)
 208 {
 209         return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE &&
 210                inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT;
 211 }
 212
 213 static inline bool ip6_sk_ignore_df(const struct sock *sk)
 214 {
 215         return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO ||
 216                inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT;
 217 }
 218
 219 static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt,
 220                                            struct in6_addr *daddr)
 221 {
 222         if (rt->rt6i_flags & RTF_GATEWAY)
 223                 return &rt->rt6i_gateway;
 224         else if (unlikely(rt->rt6i_flags & RTF_CACHE))
 225                 return &rt->rt6i_dst.addr;
 226         else
 227                 return daddr;
 228 }
 229
 230 #endif