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1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _NET_IP6_ROUTE_H
3 #define _NET_IP6_ROUTE_H
9 #if defined(__BIG_ENDIAN_BITFIELD)
13 #elif defined(__LITTLE_ENDIAN_BITFIELD)
19 __u8 prefix
[0]; /* 0,8 or 16 */
22 #include <net/addrconf.h>
24 #include <net/ip6_fib.h>
26 #include <net/lwtunnel.h>
28 #include <linux/ipv6.h>
29 #include <linux/route.h>
31 #define RT6_LOOKUP_F_IFACE 0x00000001
32 #define RT6_LOOKUP_F_REACHABLE 0x00000002
33 #define RT6_LOOKUP_F_HAS_SADDR 0x00000004
34 #define RT6_LOOKUP_F_SRCPREF_TMP 0x00000008
35 #define RT6_LOOKUP_F_SRCPREF_PUBLIC 0x00000010
36 #define RT6_LOOKUP_F_SRCPREF_COA 0x00000020
37 #define RT6_LOOKUP_F_IGNORE_LINKSTATE 0x00000040
39 /* We do not (yet ?) support IPv6 jumbograms (RFC 2675)
40 * Unlike IPv4, hdr->seg_len doesn't include the IPv6 header
42 #define IP6_MAX_MTU (0xFFFF + sizeof(struct ipv6hdr))
45 * rt6_srcprefs2flags() and rt6_flags2srcprefs() translate
46 * between IPV6_ADDR_PREFERENCES socket option values
47 * IPV6_PREFER_SRC_TMP = 0x1
48 * IPV6_PREFER_SRC_PUBLIC = 0x2
49 * IPV6_PREFER_SRC_COA = 0x4
50 * and above RT6_LOOKUP_F_SRCPREF_xxx flags.
52 static inline int rt6_srcprefs2flags(unsigned int srcprefs
)
54 /* No need to bitmask because srcprefs have only 3 bits. */
58 static inline unsigned int rt6_flags2srcprefs(int flags
)
60 return (flags
>> 3) & 7;
63 static inline bool rt6_need_strict(const struct in6_addr
*daddr
)
65 return ipv6_addr_type(daddr
) &
66 (IPV6_ADDR_MULTICAST
| IPV6_ADDR_LINKLOCAL
| IPV6_ADDR_LOOPBACK
);
69 static inline bool rt6_qualify_for_ecmp(const struct fib6_info
*f6i
)
71 return (f6i
->fib6_flags
& (RTF_GATEWAY
|RTF_ADDRCONF
|RTF_DYNAMIC
)) ==
75 void ip6_route_input(struct sk_buff
*skb
);
76 struct dst_entry
*ip6_route_input_lookup(struct net
*net
,
77 struct net_device
*dev
,
79 const struct sk_buff
*skb
, int flags
);
81 struct dst_entry
*ip6_route_output_flags(struct net
*net
, const struct sock
*sk
,
82 struct flowi6
*fl6
, int flags
);
84 static inline struct dst_entry
*ip6_route_output(struct net
*net
,
85 const struct sock
*sk
,
88 return ip6_route_output_flags(net
, sk
, fl6
, 0);
91 struct dst_entry
*ip6_route_lookup(struct net
*net
, struct flowi6
*fl6
,
92 const struct sk_buff
*skb
, int flags
);
93 struct rt6_info
*ip6_pol_route(struct net
*net
, struct fib6_table
*table
,
94 int ifindex
, struct flowi6
*fl6
,
95 const struct sk_buff
*skb
, int flags
);
97 void ip6_route_init_special_entries(void);
98 int ip6_route_init(void);
99 void ip6_route_cleanup(void);
101 int ipv6_route_ioctl(struct net
*net
, unsigned int cmd
, void __user
*arg
);
103 int ip6_route_add(struct fib6_config
*cfg
, gfp_t gfp_flags
,
104 struct netlink_ext_ack
*extack
);
105 int ip6_ins_rt(struct net
*net
, struct fib6_info
*f6i
);
106 int ip6_del_rt(struct net
*net
, struct fib6_info
*f6i
);
108 void rt6_flush_exceptions(struct fib6_info
*f6i
);
109 void rt6_age_exceptions(struct fib6_info
*f6i
, struct fib6_gc_args
*gc_args
,
112 static inline int ip6_route_get_saddr(struct net
*net
, struct fib6_info
*f6i
,
113 const struct in6_addr
*daddr
,
115 struct in6_addr
*saddr
)
119 if (f6i
&& f6i
->fib6_prefsrc
.plen
) {
120 *saddr
= f6i
->fib6_prefsrc
.addr
;
122 struct net_device
*dev
= f6i
? fib6_info_nh_dev(f6i
) : NULL
;
124 err
= ipv6_dev_get_saddr(net
, dev
, daddr
, prefs
, saddr
);
130 struct rt6_info
*rt6_lookup(struct net
*net
, const struct in6_addr
*daddr
,
131 const struct in6_addr
*saddr
, int oif
,
132 const struct sk_buff
*skb
, int flags
);
133 u32
rt6_multipath_hash(const struct net
*net
, const struct flowi6
*fl6
,
134 const struct sk_buff
*skb
, struct flow_keys
*hkeys
);
136 struct dst_entry
*icmp6_dst_alloc(struct net_device
*dev
, struct flowi6
*fl6
);
138 void fib6_force_start_gc(struct net
*net
);
140 struct fib6_info
*addrconf_f6i_alloc(struct net
*net
, struct inet6_dev
*idev
,
141 const struct in6_addr
*addr
, bool anycast
,
144 struct rt6_info
*ip6_dst_alloc(struct net
*net
, struct net_device
*dev
,
148 * support functions for ND
151 struct fib6_info
*rt6_get_dflt_router(struct net
*net
,
152 const struct in6_addr
*addr
,
153 struct net_device
*dev
);
154 struct fib6_info
*rt6_add_dflt_router(struct net
*net
,
155 const struct in6_addr
*gwaddr
,
156 struct net_device
*dev
, unsigned int pref
);
158 void rt6_purge_dflt_routers(struct net
*net
);
160 int rt6_route_rcv(struct net_device
*dev
, u8
*opt
, int len
,
161 const struct in6_addr
*gwaddr
);
163 void ip6_update_pmtu(struct sk_buff
*skb
, struct net
*net
, __be32 mtu
, int oif
,
164 u32 mark
, kuid_t uid
);
165 void ip6_sk_update_pmtu(struct sk_buff
*skb
, struct sock
*sk
, __be32 mtu
);
166 void ip6_redirect(struct sk_buff
*skb
, struct net
*net
, int oif
, u32 mark
,
168 void ip6_redirect_no_header(struct sk_buff
*skb
, struct net
*net
, int oif
);
169 void ip6_sk_redirect(struct sk_buff
*skb
, struct sock
*sk
);
171 struct netlink_callback
;
173 struct rt6_rtnl_dump_arg
{
175 struct netlink_callback
*cb
;
177 struct fib_dump_filter filter
;
180 int rt6_dump_route(struct fib6_info
*f6i
, void *p_arg
);
181 void rt6_mtu_change(struct net_device
*dev
, unsigned int mtu
);
182 void rt6_remove_prefsrc(struct inet6_ifaddr
*ifp
);
183 void rt6_clean_tohost(struct net
*net
, struct in6_addr
*gateway
);
184 void rt6_sync_up(struct net_device
*dev
, unsigned int nh_flags
);
185 void rt6_disable_ip(struct net_device
*dev
, unsigned long event
);
186 void rt6_sync_down_dev(struct net_device
*dev
, unsigned long event
);
187 void rt6_multipath_rebalance(struct fib6_info
*f6i
);
189 void rt6_uncached_list_add(struct rt6_info
*rt
);
190 void rt6_uncached_list_del(struct rt6_info
*rt
);
192 static inline const struct rt6_info
*skb_rt6_info(const struct sk_buff
*skb
)
194 const struct dst_entry
*dst
= skb_dst(skb
);
195 const struct rt6_info
*rt6
= NULL
;
198 rt6
= container_of(dst
, struct rt6_info
, dst
);
204 * Store a destination cache entry in a socket
206 static inline void ip6_dst_store(struct sock
*sk
, struct dst_entry
*dst
,
207 const struct in6_addr
*daddr
,
208 const struct in6_addr
*saddr
)
210 struct ipv6_pinfo
*np
= inet6_sk(sk
);
212 np
->dst_cookie
= rt6_get_cookie((struct rt6_info
*)dst
);
213 sk_setup_caps(sk
, dst
);
214 np
->daddr_cache
= daddr
;
215 #ifdef CONFIG_IPV6_SUBTREES
216 np
->saddr_cache
= saddr
;
220 void ip6_sk_dst_store_flow(struct sock
*sk
, struct dst_entry
*dst
,
221 const struct flowi6
*fl6
);
223 static inline bool ipv6_unicast_destination(const struct sk_buff
*skb
)
225 struct rt6_info
*rt
= (struct rt6_info
*) skb_dst(skb
);
227 return rt
->rt6i_flags
& RTF_LOCAL
;
230 static inline bool ipv6_anycast_destination(const struct dst_entry
*dst
,
231 const struct in6_addr
*daddr
)
233 struct rt6_info
*rt
= (struct rt6_info
*)dst
;
235 return rt
->rt6i_flags
& RTF_ANYCAST
||
236 (rt
->rt6i_dst
.plen
< 127 &&
237 ipv6_addr_equal(&rt
->rt6i_dst
.addr
, daddr
));
240 int ip6_fragment(struct net
*net
, struct sock
*sk
, struct sk_buff
*skb
,
241 int (*output
)(struct net
*, struct sock
*, struct sk_buff
*));
243 static inline int ip6_skb_dst_mtu(struct sk_buff
*skb
)
245 struct ipv6_pinfo
*np
= skb
->sk
&& !dev_recursion_level() ?
246 inet6_sk(skb
->sk
) : NULL
;
248 return (np
&& np
->pmtudisc
>= IPV6_PMTUDISC_PROBE
) ?
249 skb_dst(skb
)->dev
->mtu
: dst_mtu(skb_dst(skb
));
252 static inline bool ip6_sk_accept_pmtu(const struct sock
*sk
)
254 return inet6_sk(sk
)->pmtudisc
!= IPV6_PMTUDISC_INTERFACE
&&
255 inet6_sk(sk
)->pmtudisc
!= IPV6_PMTUDISC_OMIT
;
258 static inline bool ip6_sk_ignore_df(const struct sock
*sk
)
260 return inet6_sk(sk
)->pmtudisc
< IPV6_PMTUDISC_DO
||
261 inet6_sk(sk
)->pmtudisc
== IPV6_PMTUDISC_OMIT
;
264 static inline struct in6_addr
*rt6_nexthop(struct rt6_info
*rt
,
265 struct in6_addr
*daddr
)
267 if (rt
->rt6i_flags
& RTF_GATEWAY
)
268 return &rt
->rt6i_gateway
;
269 else if (unlikely(rt
->rt6i_flags
& RTF_CACHE
))
270 return &rt
->rt6i_dst
.addr
;
275 static inline bool rt6_duplicate_nexthop(struct fib6_info
*a
, struct fib6_info
*b
)
277 return a
->fib6_nh
.nh_dev
== b
->fib6_nh
.nh_dev
&&
278 ipv6_addr_equal(&a
->fib6_nh
.nh_gw
, &b
->fib6_nh
.nh_gw
) &&
279 !lwtunnel_cmp_encap(a
->fib6_nh
.nh_lwtstate
, b
->fib6_nh
.nh_lwtstate
);
282 static inline unsigned int ip6_dst_mtu_forward(const struct dst_entry
*dst
)
284 struct inet6_dev
*idev
;
287 if (dst_metric_locked(dst
, RTAX_MTU
)) {
288 mtu
= dst_metric_raw(dst
, RTAX_MTU
);
295 idev
= __in6_dev_get(dst
->dev
);
297 mtu
= idev
->cnf
.mtu6
;
303 u32
ip6_mtu_from_fib6(struct fib6_info
*f6i
, struct in6_addr
*daddr
,
304 struct in6_addr
*saddr
);
306 struct neighbour
*ip6_neigh_lookup(const struct in6_addr
*gw
,
307 struct net_device
*dev
, struct sk_buff
*skb
,