LXR linux/include/net/ip6

   1#ifndef _NET_IP6_ROUTE_H
   2#define _NET_IP6_ROUTE_H
   3
   4struct 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 */
  50static 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
  56static inline unsigned int rt6_flags2srcprefs(int flags)
  57{
  58        return (flags >> 3) & 7;
  59}
  60
  61static 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
  67void ip6_route_input(struct sk_buff *skb);
  68struct dst_entry *ip6_route_input_lookup(struct net *net,
  69                                         struct net_device *dev,
  70                                         struct flowi6 *fl6, int flags);
  71
  72struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
  73                                         struct flowi6 *fl6, int flags);
  74
  75static 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
  82struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
  83                                   int flags);
  84struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
  85                               int ifindex, struct flowi6 *fl6, int flags);
  86
  87int ip6_route_init(void);
  88void ip6_route_cleanup(void);
  89
  90int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg);
  91
  92int ip6_route_add(struct fib6_config *cfg);
  93int ip6_ins_rt(struct rt6_info *);
  94int ip6_del_rt(struct rt6_info *);
  95
  96static 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
 114struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
 115                            const struct in6_addr *saddr, int oif, int flags);
 116
 117struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6);
 118int icmp6_dst_gc(void);
 119
 120void fib6_force_start_gc(struct net *net);
 121
 122struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
 123                                    const struct in6_addr *addr, bool anycast);
 124
 125struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
 126                               int flags);
 127
 128/*
 129 *      support functions for ND
 130 *
 131 */
 132struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr,
 133                                     struct net_device *dev);
 134struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
 135                                     struct net_device *dev, unsigned int pref);
 136
 137void rt6_purge_dflt_routers(struct net *net);
 138
 139int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
 140                  const struct in6_addr *gwaddr);
 141
 142void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif,
 143                     u32 mark);
 144void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu);
 145void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark);
 146void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
 147                            u32 mark);
 148void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk);
 149
 150struct netlink_callback;
 151
 152struct rt6_rtnl_dump_arg {
 153        struct sk_buff *skb;
 154        struct netlink_callback *cb;
 155        struct net *net;
 156};
 157
 158int rt6_dump_route(struct rt6_info *rt, void *p_arg);
 159void rt6_ifdown(struct net *net, struct net_device *dev);
 160void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
 161void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
 162void rt6_clean_tohost(struct net *net, struct in6_addr *gateway);
 163
 164
 165/*
 166 *      Store a destination cache entry in a socket
 167 */
 168static 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
 182static 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
 189static 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
 199int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
 200                 int (*output)(struct net *, struct sock *, struct sk_buff *));
 201
 202static 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
 211static 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
 217static 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
 223static 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
 235