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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
[]; /* 0,8 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>
30 #include <net/nexthop.h>
32 #define RT6_LOOKUP_F_IFACE 0x00000001
33 #define RT6_LOOKUP_F_REACHABLE 0x00000002
34 #define RT6_LOOKUP_F_HAS_SADDR 0x00000004
35 #define RT6_LOOKUP_F_SRCPREF_TMP 0x00000008
36 #define RT6_LOOKUP_F_SRCPREF_PUBLIC 0x00000010
37 #define RT6_LOOKUP_F_SRCPREF_COA 0x00000020
38 #define RT6_LOOKUP_F_IGNORE_LINKSTATE 0x00000040
39 #define RT6_LOOKUP_F_DST_NOREF 0x00000080
41 /* We do not (yet ?) support IPv6 jumbograms (RFC 2675)
42 * Unlike IPv4, hdr->seg_len doesn't include the IPv6 header
44 #define IP6_MAX_MTU (0xFFFF + sizeof(struct ipv6hdr))
47 * rt6_srcprefs2flags() and rt6_flags2srcprefs() translate
48 * between IPV6_ADDR_PREFERENCES socket option values
49 * IPV6_PREFER_SRC_TMP = 0x1
50 * IPV6_PREFER_SRC_PUBLIC = 0x2
51 * IPV6_PREFER_SRC_COA = 0x4
52 * and above RT6_LOOKUP_F_SRCPREF_xxx flags.
54 static inline int rt6_srcprefs2flags(unsigned int srcprefs
)
56 /* No need to bitmask because srcprefs have only 3 bits. */
60 static inline unsigned int rt6_flags2srcprefs(int flags
)
62 return (flags
>> 3) & 7;
65 static inline bool rt6_need_strict(const struct in6_addr
*daddr
)
67 return ipv6_addr_type(daddr
) &
68 (IPV6_ADDR_MULTICAST
| IPV6_ADDR_LINKLOCAL
| IPV6_ADDR_LOOPBACK
);
71 /* fib entries using a nexthop object can not be coalesced into
74 static inline bool rt6_qualify_for_ecmp(const struct fib6_info
*f6i
)
76 /* the RTF_ADDRCONF flag filters out RA's */
77 return !(f6i
->fib6_flags
& RTF_ADDRCONF
) && !f6i
->nh
&&
78 f6i
->fib6_nh
->fib_nh_gw_family
;
81 void ip6_route_input(struct sk_buff
*skb
);
82 struct dst_entry
*ip6_route_input_lookup(struct net
*net
,
83 struct net_device
*dev
,
85 const struct sk_buff
*skb
, int flags
);
87 struct dst_entry
*ip6_route_output_flags_noref(struct net
*net
,
88 const struct sock
*sk
,
89 struct flowi6
*fl6
, int flags
);
91 struct dst_entry
*ip6_route_output_flags(struct net
*net
, const struct sock
*sk
,
92 struct flowi6
*fl6
, int flags
);
94 static inline struct dst_entry
*ip6_route_output(struct net
*net
,
95 const struct sock
*sk
,
98 return ip6_route_output_flags(net
, sk
, fl6
, 0);
101 /* Only conditionally release dst if flags indicates
102 * !RT6_LOOKUP_F_DST_NOREF or dst is in uncached_list.
104 static inline void ip6_rt_put_flags(struct rt6_info
*rt
, int flags
)
106 if (!(flags
& RT6_LOOKUP_F_DST_NOREF
) ||
107 !list_empty(&rt
->rt6i_uncached
))
111 struct dst_entry
*ip6_route_lookup(struct net
*net
, struct flowi6
*fl6
,
112 const struct sk_buff
*skb
, int flags
);
113 struct rt6_info
*ip6_pol_route(struct net
*net
, struct fib6_table
*table
,
114 int ifindex
, struct flowi6
*fl6
,
115 const struct sk_buff
*skb
, int flags
);
117 void ip6_route_init_special_entries(void);
118 int ip6_route_init(void);
119 void ip6_route_cleanup(void);
121 int ipv6_route_ioctl(struct net
*net
, unsigned int cmd
,
122 struct in6_rtmsg
*rtmsg
);
124 int ip6_route_add(struct fib6_config
*cfg
, gfp_t gfp_flags
,
125 struct netlink_ext_ack
*extack
);
126 int ip6_ins_rt(struct net
*net
, struct fib6_info
*f6i
);
127 int ip6_del_rt(struct net
*net
, struct fib6_info
*f6i
, bool skip_notify
);
129 void rt6_flush_exceptions(struct fib6_info
*f6i
);
130 void rt6_age_exceptions(struct fib6_info
*f6i
, struct fib6_gc_args
*gc_args
,
133 static inline int ip6_route_get_saddr(struct net
*net
, struct fib6_info
*f6i
,
134 const struct in6_addr
*daddr
,
136 struct in6_addr
*saddr
)
140 if (f6i
&& f6i
->fib6_prefsrc
.plen
) {
141 *saddr
= f6i
->fib6_prefsrc
.addr
;
143 struct net_device
*dev
= f6i
? fib6_info_nh_dev(f6i
) : NULL
;
145 err
= ipv6_dev_get_saddr(net
, dev
, daddr
, prefs
, saddr
);
151 struct rt6_info
*rt6_lookup(struct net
*net
, const struct in6_addr
*daddr
,
152 const struct in6_addr
*saddr
, int oif
,
153 const struct sk_buff
*skb
, int flags
);
154 u32
rt6_multipath_hash(const struct net
*net
, const struct flowi6
*fl6
,
155 const struct sk_buff
*skb
, struct flow_keys
*hkeys
);
157 struct dst_entry
*icmp6_dst_alloc(struct net_device
*dev
, struct flowi6
*fl6
);
159 void fib6_force_start_gc(struct net
*net
);
161 struct fib6_info
*addrconf_f6i_alloc(struct net
*net
, struct inet6_dev
*idev
,
162 const struct in6_addr
*addr
, bool anycast
,
165 struct rt6_info
*ip6_dst_alloc(struct net
*net
, struct net_device
*dev
,
169 * support functions for ND
172 struct fib6_info
*rt6_get_dflt_router(struct net
*net
,
173 const struct in6_addr
*addr
,
174 struct net_device
*dev
);
175 struct fib6_info
*rt6_add_dflt_router(struct net
*net
,
176 const struct in6_addr
*gwaddr
,
177 struct net_device
*dev
, unsigned int pref
);
179 void rt6_purge_dflt_routers(struct net
*net
);
181 int rt6_route_rcv(struct net_device
*dev
, u8
*opt
, int len
,
182 const struct in6_addr
*gwaddr
);
184 void ip6_update_pmtu(struct sk_buff
*skb
, struct net
*net
, __be32 mtu
, int oif
,
185 u32 mark
, kuid_t uid
);
186 void ip6_sk_update_pmtu(struct sk_buff
*skb
, struct sock
*sk
, __be32 mtu
);
187 void ip6_redirect(struct sk_buff
*skb
, struct net
*net
, int oif
, u32 mark
,
189 void ip6_redirect_no_header(struct sk_buff
*skb
, struct net
*net
, int oif
);
190 void ip6_sk_redirect(struct sk_buff
*skb
, struct sock
*sk
);
192 struct netlink_callback
;
194 struct rt6_rtnl_dump_arg
{
196 struct netlink_callback
*cb
;
198 struct fib_dump_filter filter
;
201 int rt6_dump_route(struct fib6_info
*f6i
, void *p_arg
, unsigned int skip
);
202 void rt6_mtu_change(struct net_device
*dev
, unsigned int mtu
);
203 void rt6_remove_prefsrc(struct inet6_ifaddr
*ifp
);
204 void rt6_clean_tohost(struct net
*net
, struct in6_addr
*gateway
);
205 void rt6_sync_up(struct net_device
*dev
, unsigned char nh_flags
);
206 void rt6_disable_ip(struct net_device
*dev
, unsigned long event
);
207 void rt6_sync_down_dev(struct net_device
*dev
, unsigned long event
);
208 void rt6_multipath_rebalance(struct fib6_info
*f6i
);
210 void rt6_uncached_list_add(struct rt6_info
*rt
);
211 void rt6_uncached_list_del(struct rt6_info
*rt
);
213 static inline const struct rt6_info
*skb_rt6_info(const struct sk_buff
*skb
)
215 const struct dst_entry
*dst
= skb_dst(skb
);
216 const struct rt6_info
*rt6
= NULL
;
219 rt6
= container_of(dst
, struct rt6_info
, dst
);
225 * Store a destination cache entry in a socket
227 static inline void ip6_dst_store(struct sock
*sk
, struct dst_entry
*dst
,
228 const struct in6_addr
*daddr
,
229 const struct in6_addr
*saddr
)
231 struct ipv6_pinfo
*np
= inet6_sk(sk
);
233 np
->dst_cookie
= rt6_get_cookie((struct rt6_info
*)dst
);
234 sk_setup_caps(sk
, dst
);
235 np
->daddr_cache
= daddr
;
236 #ifdef CONFIG_IPV6_SUBTREES
237 np
->saddr_cache
= saddr
;
241 void ip6_sk_dst_store_flow(struct sock
*sk
, struct dst_entry
*dst
,
242 const struct flowi6
*fl6
);
244 static inline bool ipv6_unicast_destination(const struct sk_buff
*skb
)
246 struct rt6_info
*rt
= (struct rt6_info
*) skb_dst(skb
);
248 return rt
->rt6i_flags
& RTF_LOCAL
;
251 static inline bool ipv6_anycast_destination(const struct dst_entry
*dst
,
252 const struct in6_addr
*daddr
)
254 struct rt6_info
*rt
= (struct rt6_info
*)dst
;
256 return rt
->rt6i_flags
& RTF_ANYCAST
||
257 (rt
->rt6i_dst
.plen
< 127 &&
258 !(rt
->rt6i_flags
& (RTF_GATEWAY
| RTF_NONEXTHOP
)) &&
259 ipv6_addr_equal(&rt
->rt6i_dst
.addr
, daddr
));
262 int ip6_fragment(struct net
*net
, struct sock
*sk
, struct sk_buff
*skb
,
263 int (*output
)(struct net
*, struct sock
*, struct sk_buff
*));
265 static inline int ip6_skb_dst_mtu(struct sk_buff
*skb
)
267 struct ipv6_pinfo
*np
= skb
->sk
&& !dev_recursion_level() ?
268 inet6_sk(skb
->sk
) : NULL
;
270 return (np
&& np
->pmtudisc
>= IPV6_PMTUDISC_PROBE
) ?
271 skb_dst(skb
)->dev
->mtu
: dst_mtu(skb_dst(skb
));
274 static inline bool ip6_sk_accept_pmtu(const struct sock
*sk
)
276 return inet6_sk(sk
)->pmtudisc
!= IPV6_PMTUDISC_INTERFACE
&&
277 inet6_sk(sk
)->pmtudisc
!= IPV6_PMTUDISC_OMIT
;
280 static inline bool ip6_sk_ignore_df(const struct sock
*sk
)
282 return inet6_sk(sk
)->pmtudisc
< IPV6_PMTUDISC_DO
||
283 inet6_sk(sk
)->pmtudisc
== IPV6_PMTUDISC_OMIT
;
286 static inline const struct in6_addr
*rt6_nexthop(const struct rt6_info
*rt
,
287 const struct in6_addr
*daddr
)
289 if (rt
->rt6i_flags
& RTF_GATEWAY
)
290 return &rt
->rt6i_gateway
;
291 else if (unlikely(rt
->rt6i_flags
& RTF_CACHE
))
292 return &rt
->rt6i_dst
.addr
;
297 static inline bool rt6_duplicate_nexthop(struct fib6_info
*a
, struct fib6_info
*b
)
299 struct fib6_nh
*nha
, *nhb
;
302 return nexthop_cmp(a
->nh
, b
->nh
);
306 return nha
->fib_nh_dev
== nhb
->fib_nh_dev
&&
307 ipv6_addr_equal(&nha
->fib_nh_gw6
, &nhb
->fib_nh_gw6
) &&
308 !lwtunnel_cmp_encap(nha
->fib_nh_lws
, nhb
->fib_nh_lws
);
311 static inline unsigned int ip6_dst_mtu_forward(const struct dst_entry
*dst
)
313 struct inet6_dev
*idev
;
316 if (dst_metric_locked(dst
, RTAX_MTU
)) {
317 mtu
= dst_metric_raw(dst
, RTAX_MTU
);
324 idev
= __in6_dev_get(dst
->dev
);
326 mtu
= idev
->cnf
.mtu6
;
332 u32
ip6_mtu_from_fib6(const struct fib6_result
*res
,
333 const struct in6_addr
*daddr
,
334 const struct in6_addr
*saddr
);
336 struct neighbour
*ip6_neigh_lookup(const struct in6_addr
*gw
,
337 struct net_device
*dev
, struct sk_buff
*skb
,