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