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 */
21 #include <net/addrconf.h>
23 #include <net/ip6_fib.h>
26 #include <linux/ipv6.h>
27 #include <linux/route.h>
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
36 /* We do not (yet ?) support IPv6 jumbograms (RFC 2675)
37 * Unlike IPv4, hdr->seg_len doesn't include the IPv6 header
39 #define IP6_MAX_MTU (0xFFFF + sizeof(struct ipv6hdr))
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.
49 static inline int rt6_srcprefs2flags(unsigned int srcprefs
)
51 /* No need to bitmask because srcprefs have only 3 bits. */
55 static inline unsigned int rt6_flags2srcprefs(int flags
)
57 return (flags
>> 3) & 7;
60 static inline bool rt6_need_strict(const struct in6_addr
*daddr
)
62 return ipv6_addr_type(daddr
) &
63 (IPV6_ADDR_MULTICAST
| IPV6_ADDR_LINKLOCAL
| IPV6_ADDR_LOOPBACK
);
66 void ip6_route_input(struct sk_buff
*skb
);
67 struct dst_entry
*ip6_route_input_lookup(struct net
*net
,
68 struct net_device
*dev
,
69 struct flowi6
*fl6
, int flags
);
71 struct dst_entry
*ip6_route_output_flags(struct net
*net
, const struct sock
*sk
,
72 struct flowi6
*fl6
, int flags
);
74 static inline struct dst_entry
*ip6_route_output(struct net
*net
,
75 const struct sock
*sk
,
78 return ip6_route_output_flags(net
, sk
, fl6
, 0);
81 struct dst_entry
*ip6_route_lookup(struct net
*net
, struct flowi6
*fl6
,
83 struct rt6_info
*ip6_pol_route(struct net
*net
, struct fib6_table
*table
,
84 int ifindex
, struct flowi6
*fl6
, int flags
);
86 int ip6_route_init(void);
87 void ip6_route_cleanup(void);
89 int ipv6_route_ioctl(struct net
*net
, unsigned int cmd
, void __user
*arg
);
91 int ip6_route_add(struct fib6_config
*cfg
);
92 int ip6_ins_rt(struct rt6_info
*);
93 int ip6_del_rt(struct rt6_info
*);
95 static inline int ip6_route_get_saddr(struct net
*net
, struct rt6_info
*rt
,
96 const struct in6_addr
*daddr
,
98 struct in6_addr
*saddr
)
100 struct inet6_dev
*idev
=
101 rt
? ip6_dst_idev((struct dst_entry
*)rt
) : NULL
;
104 if (rt
&& rt
->rt6i_prefsrc
.plen
)
105 *saddr
= rt
->rt6i_prefsrc
.addr
;
107 err
= ipv6_dev_get_saddr(net
, idev
? idev
->dev
: NULL
,
108 daddr
, prefs
, saddr
);
113 struct rt6_info
*rt6_lookup(struct net
*net
, const struct in6_addr
*daddr
,
114 const struct in6_addr
*saddr
, int oif
, int flags
);
116 struct dst_entry
*icmp6_dst_alloc(struct net_device
*dev
, struct flowi6
*fl6
);
117 int icmp6_dst_gc(void);
119 void fib6_force_start_gc(struct net
*net
);
121 struct rt6_info
*addrconf_dst_alloc(struct inet6_dev
*idev
,
122 const struct in6_addr
*addr
, bool anycast
);
124 struct rt6_info
*ip6_dst_alloc(struct net
*net
, struct net_device
*dev
,
128 * support functions for ND
131 struct rt6_info
*rt6_get_dflt_router(const struct in6_addr
*addr
,
132 struct net_device
*dev
);
133 struct rt6_info
*rt6_add_dflt_router(const struct in6_addr
*gwaddr
,
134 struct net_device
*dev
, unsigned int pref
);
136 void rt6_purge_dflt_routers(struct net
*net
);
138 int rt6_route_rcv(struct net_device
*dev
, u8
*opt
, int len
,
139 const struct in6_addr
*gwaddr
);
141 void ip6_update_pmtu(struct sk_buff
*skb
, struct net
*net
, __be32 mtu
, int oif
,
143 void ip6_sk_update_pmtu(struct sk_buff
*skb
, struct sock
*sk
, __be32 mtu
);
144 void ip6_redirect(struct sk_buff
*skb
, struct net
*net
, int oif
, u32 mark
);
145 void ip6_redirect_no_header(struct sk_buff
*skb
, struct net
*net
, int oif
,
147 void ip6_sk_redirect(struct sk_buff
*skb
, struct sock
*sk
);
149 struct netlink_callback
;
151 struct rt6_rtnl_dump_arg
{
153 struct netlink_callback
*cb
;
157 int rt6_dump_route(struct rt6_info
*rt
, void *p_arg
);
158 void rt6_ifdown(struct net
*net
, struct net_device
*dev
);
159 void rt6_mtu_change(struct net_device
*dev
, unsigned int mtu
);
160 void rt6_remove_prefsrc(struct inet6_ifaddr
*ifp
);
161 void rt6_clean_tohost(struct net
*net
, struct in6_addr
*gateway
);
165 * Store a destination cache entry in a socket
167 static inline void ip6_dst_store(struct sock
*sk
, struct dst_entry
*dst
,
168 const struct in6_addr
*daddr
,
169 const struct in6_addr
*saddr
)
171 struct ipv6_pinfo
*np
= inet6_sk(sk
);
173 np
->dst_cookie
= rt6_get_cookie((struct rt6_info
*)dst
);
174 sk_setup_caps(sk
, dst
);
175 np
->daddr_cache
= daddr
;
176 #ifdef CONFIG_IPV6_SUBTREES
177 np
->saddr_cache
= saddr
;
181 static inline bool ipv6_unicast_destination(const struct sk_buff
*skb
)
183 struct rt6_info
*rt
= (struct rt6_info
*) skb_dst(skb
);
185 return rt
->rt6i_flags
& RTF_LOCAL
;
188 static inline bool ipv6_anycast_destination(const struct dst_entry
*dst
,
189 const struct in6_addr
*daddr
)
191 struct rt6_info
*rt
= (struct rt6_info
*)dst
;
193 return rt
->rt6i_flags
& RTF_ANYCAST
||
194 (rt
->rt6i_dst
.plen
!= 128 &&
195 ipv6_addr_equal(&rt
->rt6i_dst
.addr
, daddr
));
198 int ip6_fragment(struct net
*net
, struct sock
*sk
, struct sk_buff
*skb
,
199 int (*output
)(struct net
*, struct sock
*, struct sk_buff
*));
201 static inline int ip6_skb_dst_mtu(struct sk_buff
*skb
)
203 struct ipv6_pinfo
*np
= skb
->sk
&& !dev_recursion_level() ?
204 inet6_sk(skb
->sk
) : NULL
;
206 return (np
&& np
->pmtudisc
>= IPV6_PMTUDISC_PROBE
) ?
207 skb_dst(skb
)->dev
->mtu
: dst_mtu(skb_dst(skb
));
210 static inline bool ip6_sk_accept_pmtu(const struct sock
*sk
)
212 return inet6_sk(sk
)->pmtudisc
!= IPV6_PMTUDISC_INTERFACE
&&
213 inet6_sk(sk
)->pmtudisc
!= IPV6_PMTUDISC_OMIT
;
216 static inline bool ip6_sk_ignore_df(const struct sock
*sk
)
218 return inet6_sk(sk
)->pmtudisc
< IPV6_PMTUDISC_DO
||
219 inet6_sk(sk
)->pmtudisc
== IPV6_PMTUDISC_OMIT
;
222 static inline struct in6_addr
*rt6_nexthop(struct rt6_info
*rt
,
223 struct in6_addr
*daddr
)
225 if (rt
->rt6i_flags
& RTF_GATEWAY
)
226 return &rt
->rt6i_gateway
;
227 else if (unlikely(rt
->rt6i_flags
& RTF_CACHE
))
228 return &rt
->rt6i_dst
.addr
;