linux/include/net/ip6_route.h
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   1#ifndef _NET_IP6_ROUTE_H
   2#define _NET_IP6_ROUTE_H
   3
   4#define IP6_RT_PRIO_USER        1024
   5#define IP6_RT_PRIO_ADDRCONF    256
   6
   7struct route_info {
   8        __u8                    type;
   9        __u8                    length;
  10        __u8                    prefix_len;
  11#if defined(__BIG_ENDIAN_BITFIELD)
  12        __u8                    reserved_h:3,
  13                                route_pref:2,
  14                                reserved_l:3;
  15#elif defined(__LITTLE_ENDIAN_BITFIELD)
  16        __u8                    reserved_l:3,
  17                                route_pref:2,
  18                                reserved_h:3;
  19#endif
  20        __be32                  lifetime;
  21        __u8                    prefix[0];      /* 0,8 or 16 */
  22};
  23
  24#include <net/flow.h>
  25#include <net/ip6_fib.h>
  26#include <net/sock.h>
  27#include <linux/ip.h>
  28#include <linux/ipv6.h>
  29
  30#define RT6_LOOKUP_F_IFACE              0x00000001
  31#define RT6_LOOKUP_F_REACHABLE          0x00000002
  32#define RT6_LOOKUP_F_HAS_SADDR          0x00000004
  33#define RT6_LOOKUP_F_SRCPREF_TMP        0x00000008
  34#define RT6_LOOKUP_F_SRCPREF_PUBLIC     0x00000010
  35#define RT6_LOOKUP_F_SRCPREF_COA        0x00000020
  36
  37/*
  38 * rt6_srcprefs2flags() and rt6_flags2srcprefs() translate
  39 * between IPV6_ADDR_PREFERENCES socket option values
  40 *      IPV6_PREFER_SRC_TMP    = 0x1
  41 *      IPV6_PREFER_SRC_PUBLIC = 0x2
  42 *      IPV6_PREFER_SRC_COA    = 0x4
  43 * and above RT6_LOOKUP_F_SRCPREF_xxx flags.
  44 */
  45static inline int rt6_srcprefs2flags(unsigned int srcprefs)
  46{
  47        /* No need to bitmask because srcprefs have only 3 bits. */
  48        return srcprefs << 3;
  49}
  50
  51static inline unsigned int rt6_flags2srcprefs(int flags)
  52{
  53        return (flags >> 3) & 7;
  54}
  55
  56extern void rt6_bind_peer(struct rt6_info *rt, int create);
  57
  58static inline struct inet_peer *__rt6_get_peer(struct rt6_info *rt, int create)
  59{
  60        if (rt6_has_peer(rt))
  61                return rt6_peer_ptr(rt);
  62
  63        rt6_bind_peer(rt, create);
  64        return (rt6_has_peer(rt) ? rt6_peer_ptr(rt) : NULL);
  65}
  66
  67static inline struct inet_peer *rt6_get_peer(struct rt6_info *rt)
  68{
  69        return __rt6_get_peer(rt, 0);
  70}
  71
  72static inline struct inet_peer *rt6_get_peer_create(struct rt6_info *rt)
  73{
  74        return __rt6_get_peer(rt, 1);
  75}
  76
  77extern void                     ip6_route_input(struct sk_buff *skb);
  78
  79extern struct dst_entry *       ip6_route_output(struct net *net,
  80                                                 const struct sock *sk,
  81                                                 struct flowi6 *fl6);
  82extern struct dst_entry *       ip6_route_lookup(struct net *net,
  83                                                 struct flowi6 *fl6, int flags);
  84
  85extern int                      ip6_route_init(void);
  86extern void                     ip6_route_cleanup(void);
  87
  88extern int                      ipv6_route_ioctl(struct net *net,
  89                                                 unsigned int cmd,
  90                                                 void __user *arg);
  91
  92extern int                      ip6_route_add(struct fib6_config *cfg);
  93extern int                      ip6_ins_rt(struct rt6_info *);
  94extern int                      ip6_del_rt(struct rt6_info *);
  95
  96extern int                      ip6_route_get_saddr(struct net *net,
  97                                                    struct rt6_info *rt,
  98                                                    const struct in6_addr *daddr,
  99                                                    unsigned int prefs,
 100                                                    struct in6_addr *saddr);
 101
 102extern struct rt6_info          *rt6_lookup(struct net *net,
 103                                            const struct in6_addr *daddr,
 104                                            const struct in6_addr *saddr,
 105                                            int oif, int flags);
 106
 107extern struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
 108                                         struct neighbour *neigh,
 109                                         struct flowi6 *fl6);
 110extern int icmp6_dst_gc(void);
 111
 112extern void fib6_force_start_gc(struct net *net);
 113
 114extern struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
 115                                           const struct in6_addr *addr,
 116                                           bool anycast);
 117
 118extern int                      ip6_dst_hoplimit(struct dst_entry *dst);
 119
 120/*
 121 *      support functions for ND
 122 *
 123 */
 124extern struct rt6_info *        rt6_get_dflt_router(const struct in6_addr *addr,
 125                                                    struct net_device *dev);
 126extern struct rt6_info *        rt6_add_dflt_router(const struct in6_addr *gwaddr,
 127                                                    struct net_device *dev,
 128                                                    unsigned int pref);
 129
 130extern void                     rt6_purge_dflt_routers(struct net *net);
 131
 132extern int                      rt6_route_rcv(struct net_device *dev,
 133                                              u8 *opt, int len,
 134                                              const struct in6_addr *gwaddr);
 135
 136extern void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
 137                            int oif, u32 mark);
 138extern void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk,
 139                               __be32 mtu);
 140extern void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark);
 141extern void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk);
 142
 143struct netlink_callback;
 144
 145struct rt6_rtnl_dump_arg {
 146        struct sk_buff *skb;
 147        struct netlink_callback *cb;
 148        struct net *net;
 149};
 150
 151extern int rt6_dump_route(struct rt6_info *rt, void *p_arg);
 152extern void rt6_ifdown(struct net *net, struct net_device *dev);
 153extern void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
 154extern void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
 155
 156
 157/*
 158 *      Store a destination cache entry in a socket
 159 */
 160static inline void __ip6_dst_store(struct sock *sk, struct dst_entry *dst,
 161                                   const struct in6_addr *daddr,
 162                                   const struct in6_addr *saddr)
 163{
 164        struct ipv6_pinfo *np = inet6_sk(sk);
 165        struct rt6_info *rt = (struct rt6_info *) dst;
 166
 167        sk_setup_caps(sk, dst);
 168        np->daddr_cache = daddr;
 169#ifdef CONFIG_IPV6_SUBTREES
 170        np->saddr_cache = saddr;
 171#endif
 172        np->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
 173}
 174
 175static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
 176                                 struct in6_addr *daddr, struct in6_addr *saddr)
 177{
 178        spin_lock(&sk->sk_dst_lock);
 179        __ip6_dst_store(sk, dst, daddr, saddr);
 180        spin_unlock(&sk->sk_dst_lock);
 181}
 182
 183static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
 184{
 185        struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
 186
 187        return rt->rt6i_flags & RTF_LOCAL;
 188}
 189
 190int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
 191
 192static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
 193{
 194        struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL;
 195
 196        return (np && np->pmtudisc == IPV6_PMTUDISC_PROBE) ?
 197               skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
 198}
 199
 200#endif
 201
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