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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - include/net/ip6_route.h
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
35 /* We do not (yet ?) support IPv6 jumbograms (RFC 2675)
36 * Unlike IPv4, hdr->seg_len doesn't include the IPv6 header
38 #define IP6_MAX_MTU (0xFFFF + sizeof(struct ipv6hdr))
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.
48 static inline int rt6_srcprefs2flags(unsigned int srcprefs
)
50 /* No need to bitmask because srcprefs have only 3 bits. */
54 static inline unsigned int rt6_flags2srcprefs(int flags
)
56 return (flags
>> 3) & 7;
59 static inline bool rt6_need_strict(const struct in6_addr
*daddr
)
61 return ipv6_addr_type(daddr
) &
62 (IPV6_ADDR_MULTICAST
| IPV6_ADDR_LINKLOCAL
| IPV6_ADDR_LOOPBACK
);
65 void ip6_route_input(struct sk_buff
*skb
);
67 struct dst_entry
*ip6_route_output(struct net
*net
, const struct sock
*sk
,
69 struct dst_entry
*ip6_route_lookup(struct net
*net
, struct flowi6
*fl6
,
72 int ip6_route_init(void);
73 void ip6_route_cleanup(void);
75 int ipv6_route_ioctl(struct net
*net
, unsigned int cmd
, void __user
*arg
);
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
*);
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
);
85 struct rt6_info
*rt6_lookup(struct net
*net
, const struct in6_addr
*daddr
,
86 const struct in6_addr
*saddr
, int oif
, int flags
);
88 struct dst_entry
*icmp6_dst_alloc(struct net_device
*dev
, struct flowi6
*fl6
);
89 int icmp6_dst_gc(void);
91 void fib6_force_start_gc(struct net
*net
);
93 struct rt6_info
*addrconf_dst_alloc(struct inet6_dev
*idev
,
94 const struct in6_addr
*addr
, bool anycast
);
97 * support functions for ND
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
);
105 void rt6_purge_dflt_routers(struct net
*net
);
107 int rt6_route_rcv(struct net_device
*dev
, u8
*opt
, int len
,
108 const struct in6_addr
*gwaddr
);
110 void ip6_update_pmtu(struct sk_buff
*skb
, struct net
*net
, __be32 mtu
, int oif
,
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
,
116 void ip6_sk_redirect(struct sk_buff
*skb
, struct sock
*sk
);
118 struct netlink_callback
;
120 struct rt6_rtnl_dump_arg
{
122 struct netlink_callback
*cb
;
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
);
134 * Store a destination cache entry in a socket
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
)
140 struct ipv6_pinfo
*np
= inet6_sk(sk
);
141 struct rt6_info
*rt
= (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
;
148 np
->dst_cookie
= rt6_get_cookie(rt
);
151 static inline void ip6_dst_store(struct sock
*sk
, struct dst_entry
*dst
,
152 struct in6_addr
*daddr
, struct in6_addr
*saddr
)
154 spin_lock(&sk
->sk_dst_lock
);
155 __ip6_dst_store(sk
, dst
, daddr
, saddr
);
156 spin_unlock(&sk
->sk_dst_lock
);
159 static inline bool ipv6_unicast_destination(const struct sk_buff
*skb
)
161 struct rt6_info
*rt
= (struct rt6_info
*) skb_dst(skb
);
163 return rt
->rt6i_flags
& RTF_LOCAL
;
166 static inline bool ipv6_anycast_destination(const struct dst_entry
*dst
,
167 const struct in6_addr
*daddr
)
169 struct rt6_info
*rt
= (struct rt6_info
*)dst
;
171 return rt
->rt6i_flags
& RTF_ANYCAST
||
172 (rt
->rt6i_dst
.plen
!= 128 &&
173 ipv6_addr_equal(&rt
->rt6i_dst
.addr
, daddr
));
176 int ip6_fragment(struct sock
*sk
, struct sk_buff
*skb
,
177 int (*output
)(struct sock
*, struct sk_buff
*));
179 static inline int ip6_skb_dst_mtu(struct sk_buff
*skb
)
181 struct ipv6_pinfo
*np
= skb
->sk
&& !dev_recursion_level() ?
182 inet6_sk(skb
->sk
) : NULL
;
184 return (np
&& np
->pmtudisc
>= IPV6_PMTUDISC_PROBE
) ?
185 skb_dst(skb
)->dev
->mtu
: dst_mtu(skb_dst(skb
));
188 static inline bool ip6_sk_accept_pmtu(const struct sock
*sk
)
190 return inet6_sk(sk
)->pmtudisc
!= IPV6_PMTUDISC_INTERFACE
&&
191 inet6_sk(sk
)->pmtudisc
!= IPV6_PMTUDISC_OMIT
;
194 static inline bool ip6_sk_ignore_df(const struct sock
*sk
)
196 return inet6_sk(sk
)->pmtudisc
< IPV6_PMTUDISC_DO
||
197 inet6_sk(sk
)->pmtudisc
== IPV6_PMTUDISC_OMIT
;
200 static inline struct in6_addr
*rt6_nexthop(struct rt6_info
*rt
,
201 struct in6_addr
*daddr
)
203 if (rt
->rt6i_flags
& RTF_GATEWAY
)
204 return &rt
->rt6i_gateway
;
205 else if (unlikely(rt
->rt6i_flags
& RTF_CACHE
))
206 return &rt
->rt6i_dst
.addr
;