1 #ifndef _NET_IP6_ROUTE_H
2 #define _NET_IP6_ROUTE_H
8 #if defined(__BIG_ENDIAN_BITFIELD)
12 #elif defined(__LITTLE_ENDIAN_BITFIELD)
18 __u8 prefix[0]; /* 0,8 or 16 */
22 #include <net/ip6_fib.h>
25 #include <linux/ipv6.h>
26 #include <linux/route.h>
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
36 * rt6_srcprefs2flags() and rt6_flags2srcprefs() translate
37 * between IPV6_ADDR_PREFERENCES socket option values
38 * IPV6_PREFER_SRC_TMP = 0x1
39 * IPV6_PREFER_SRC_PUBLIC = 0x2
40 * IPV6_PREFER_SRC_COA = 0x4
41 * and above RT6_LOOKUP_F_SRCPREF_xxx flags.
43 static inline int rt6_srcprefs2flags(unsigned int srcprefs)
45 /* No need to bitmask because srcprefs have only 3 bits. */
49 static inline unsigned int rt6_flags2srcprefs(int flags)
51 return (flags >> 3) & 7;
54 static inline bool rt6_need_strict(const struct in6_addr *daddr)
56 return ipv6_addr_type(daddr) &
57 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
60 void ip6_route_input(struct sk_buff *skb);
62 struct dst_entry *ip6_route_output(struct net *net, const struct sock *sk,
64 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
67 int ip6_route_init(void);
68 void ip6_route_cleanup(void);
70 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg);
72 int ip6_route_add(struct fib6_config *cfg);
73 int ip6_ins_rt(struct rt6_info *);
74 int ip6_del_rt(struct rt6_info *);
76 int ip6_route_get_saddr(struct net *net, struct rt6_info *rt,
77 const struct in6_addr *daddr, unsigned int prefs,
78 struct in6_addr *saddr);
80 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
81 const struct in6_addr *saddr, int oif, int flags);
83 struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6);
84 int icmp6_dst_gc(void);
86 void fib6_force_start_gc(struct net *net);
88 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
89 const struct in6_addr *addr, bool anycast);
92 * support functions for ND
95 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr,
96 struct net_device *dev);
97 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
98 struct net_device *dev, unsigned int pref);
100 void rt6_purge_dflt_routers(struct net *net);
102 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
103 const struct in6_addr *gwaddr);
105 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif,
107 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu);
108 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark);
109 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
111 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk);
113 struct netlink_callback;
115 struct rt6_rtnl_dump_arg {
117 struct netlink_callback *cb;
121 int rt6_dump_route(struct rt6_info *rt, void *p_arg);
122 void rt6_ifdown(struct net *net, struct net_device *dev);
123 void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
124 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
128 * Store a destination cache entry in a socket
130 static inline void __ip6_dst_store(struct sock *sk, struct dst_entry *dst,
131 const struct in6_addr *daddr,
132 const struct in6_addr *saddr)
134 struct ipv6_pinfo *np = inet6_sk(sk);
135 struct rt6_info *rt = (struct rt6_info *) dst;
137 sk_setup_caps(sk, dst);
138 np->daddr_cache = daddr;
139 #ifdef CONFIG_IPV6_SUBTREES
140 np->saddr_cache = saddr;
142 np->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
145 static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
146 struct in6_addr *daddr, struct in6_addr *saddr)
148 spin_lock(&sk->sk_dst_lock);
149 __ip6_dst_store(sk, dst, daddr, saddr);
150 spin_unlock(&sk->sk_dst_lock);
153 static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
155 struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
157 return rt->rt6i_flags & RTF_LOCAL;
160 static inline bool ipv6_anycast_destination(const struct sk_buff *skb)
162 struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
164 return rt->rt6i_flags & RTF_ANYCAST;
167 int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
169 static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
171 struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL;
173 return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ?
174 skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
177 static inline bool ip6_sk_accept_pmtu(const struct sock *sk)
179 return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE &&
180 inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT;
183 static inline bool ip6_sk_local_df(const struct sock *sk)
185 return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO ||
186 inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT;
189 static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt)
191 return &rt->rt6i_gateway;