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git.ipfire.org Git - thirdparty/kernel/stable.git/blob - include/net/ip6_route.h
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _NET_IP6_ROUTE_H
3 #define _NET_IP6_ROUTE_H
5 #include <net/addrconf.h>
7 #include <net/ip6_fib.h>
9 #include <net/lwtunnel.h>
11 #include <linux/ipv6.h>
12 #include <linux/route.h>
13 #include <net/nexthop.h>
19 #if defined(__BIG_ENDIAN_BITFIELD)
23 #elif defined(__LITTLE_ENDIAN_BITFIELD)
29 __u8 prefix
[]; /* 0,8 or 16 */
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 return (srcprefs
& IPV6_PREFER_SRC_MASK
) << 3;
59 static inline unsigned int rt6_flags2srcprefs(int flags
)
61 return (flags
>> 3) & IPV6_PREFER_SRC_MASK
;
64 static inline bool rt6_need_strict(const struct in6_addr
*daddr
)
66 return ipv6_addr_type(daddr
) &
67 (IPV6_ADDR_MULTICAST
| IPV6_ADDR_LINKLOCAL
| IPV6_ADDR_LOOPBACK
);
70 /* fib entries using a nexthop object can not be coalesced into
73 static inline bool rt6_qualify_for_ecmp(const struct fib6_info
*f6i
)
75 /* the RTF_ADDRCONF flag filters out RA's */
76 return !(f6i
->fib6_flags
& RTF_ADDRCONF
) && !f6i
->nh
&&
77 f6i
->fib6_nh
->fib_nh_gw_family
;
80 void ip6_route_input(struct sk_buff
*skb
);
81 struct dst_entry
*ip6_route_input_lookup(struct net
*net
,
82 struct net_device
*dev
,
84 const struct sk_buff
*skb
, int flags
);
86 struct dst_entry
*ip6_route_output_flags(struct net
*net
, const struct sock
*sk
,
87 struct flowi6
*fl6
, int flags
);
89 static inline struct dst_entry
*ip6_route_output(struct net
*net
,
90 const struct sock
*sk
,
93 return ip6_route_output_flags(net
, sk
, fl6
, 0);
96 /* Only conditionally release dst if flags indicates
97 * !RT6_LOOKUP_F_DST_NOREF or dst is in uncached_list.
99 static inline void ip6_rt_put_flags(struct rt6_info
*rt
, int flags
)
101 if (!(flags
& RT6_LOOKUP_F_DST_NOREF
) ||
102 !list_empty(&rt
->dst
.rt_uncached
))
106 struct dst_entry
*ip6_route_lookup(struct net
*net
, struct flowi6
*fl6
,
107 const struct sk_buff
*skb
, int flags
);
108 struct rt6_info
*ip6_pol_route(struct net
*net
, struct fib6_table
*table
,
109 int ifindex
, struct flowi6
*fl6
,
110 const struct sk_buff
*skb
, int flags
);
112 void ip6_route_init_special_entries(void);
113 int ip6_route_init(void);
114 void ip6_route_cleanup(void);
116 int ipv6_route_ioctl(struct net
*net
, unsigned int cmd
,
117 struct in6_rtmsg
*rtmsg
);
119 int ip6_route_add(struct fib6_config
*cfg
, gfp_t gfp_flags
,
120 struct netlink_ext_ack
*extack
);
121 int ip6_ins_rt(struct net
*net
, struct fib6_info
*f6i
);
122 int ip6_del_rt(struct net
*net
, struct fib6_info
*f6i
, bool skip_notify
);
124 void rt6_flush_exceptions(struct fib6_info
*f6i
);
125 void rt6_age_exceptions(struct fib6_info
*f6i
, struct fib6_gc_args
*gc_args
,
128 static inline int ip6_route_get_saddr(struct net
*net
, struct fib6_info
*f6i
,
129 const struct in6_addr
*daddr
,
131 struct in6_addr
*saddr
)
135 if (f6i
&& f6i
->fib6_prefsrc
.plen
) {
136 *saddr
= f6i
->fib6_prefsrc
.addr
;
138 struct net_device
*dev
= f6i
? fib6_info_nh_dev(f6i
) : NULL
;
140 err
= ipv6_dev_get_saddr(net
, dev
, daddr
, prefs
, saddr
);
146 struct rt6_info
*rt6_lookup(struct net
*net
, const struct in6_addr
*daddr
,
147 const struct in6_addr
*saddr
, int oif
,
148 const struct sk_buff
*skb
, int flags
);
149 u32
rt6_multipath_hash(const struct net
*net
, const struct flowi6
*fl6
,
150 const struct sk_buff
*skb
, struct flow_keys
*hkeys
);
152 struct dst_entry
*icmp6_dst_alloc(struct net_device
*dev
, struct flowi6
*fl6
);
154 void fib6_force_start_gc(struct net
*net
);
156 struct fib6_info
*addrconf_f6i_alloc(struct net
*net
, struct inet6_dev
*idev
,
157 const struct in6_addr
*addr
, bool anycast
,
158 gfp_t gfp_flags
, struct netlink_ext_ack
*extack
);
160 struct rt6_info
*ip6_dst_alloc(struct net
*net
, struct net_device
*dev
,
164 * support functions for ND
167 struct fib6_info
*rt6_get_dflt_router(struct net
*net
,
168 const struct in6_addr
*addr
,
169 struct net_device
*dev
);
170 struct fib6_info
*rt6_add_dflt_router(struct net
*net
,
171 const struct in6_addr
*gwaddr
,
172 struct net_device
*dev
, unsigned int pref
,
173 u32 defrtr_usr_metric
,
176 void rt6_purge_dflt_routers(struct net
*net
);
178 int rt6_route_rcv(struct net_device
*dev
, u8
*opt
, int len
,
179 const struct in6_addr
*gwaddr
);
181 void ip6_update_pmtu(struct sk_buff
*skb
, struct net
*net
, __be32 mtu
, int oif
,
182 u32 mark
, kuid_t uid
);
183 void ip6_sk_update_pmtu(struct sk_buff
*skb
, struct sock
*sk
, __be32 mtu
);
184 void ip6_redirect(struct sk_buff
*skb
, struct net
*net
, int oif
, u32 mark
,
186 void ip6_redirect_no_header(struct sk_buff
*skb
, struct net
*net
, int oif
);
187 void ip6_sk_redirect(struct sk_buff
*skb
, struct sock
*sk
);
189 struct netlink_callback
;
191 struct rt6_rtnl_dump_arg
{
193 struct netlink_callback
*cb
;
195 struct fib_dump_filter filter
;
198 int rt6_dump_route(struct fib6_info
*f6i
, void *p_arg
, unsigned int skip
);
199 void rt6_mtu_change(struct net_device
*dev
, unsigned int mtu
);
200 void rt6_remove_prefsrc(struct inet6_ifaddr
*ifp
);
201 void rt6_clean_tohost(struct net
*net
, struct in6_addr
*gateway
);
202 void rt6_sync_up(struct net_device
*dev
, unsigned char nh_flags
);
203 void rt6_disable_ip(struct net_device
*dev
, unsigned long event
);
204 void rt6_sync_down_dev(struct net_device
*dev
, unsigned long event
);
205 void rt6_multipath_rebalance(struct fib6_info
*f6i
);
207 void rt6_uncached_list_add(struct rt6_info
*rt
);
208 void rt6_uncached_list_del(struct rt6_info
*rt
);
210 static inline const struct rt6_info
*skb_rt6_info(const struct sk_buff
*skb
)
212 const struct dst_entry
*dst
= skb_dst(skb
);
213 const struct rt6_info
*rt6
= NULL
;
216 rt6
= container_of(dst
, struct rt6_info
, dst
);
222 * Store a destination cache entry in a socket
224 static inline void ip6_dst_store(struct sock
*sk
, struct dst_entry
*dst
,
225 const struct in6_addr
*daddr
,
226 const struct in6_addr
*saddr
)
228 struct ipv6_pinfo
*np
= inet6_sk(sk
);
230 np
->dst_cookie
= rt6_get_cookie((struct rt6_info
*)dst
);
231 sk_setup_caps(sk
, dst
);
232 np
->daddr_cache
= daddr
;
233 #ifdef CONFIG_IPV6_SUBTREES
234 np
->saddr_cache
= saddr
;
238 void ip6_sk_dst_store_flow(struct sock
*sk
, struct dst_entry
*dst
,
239 const struct flowi6
*fl6
);
241 static inline bool ipv6_unicast_destination(const struct sk_buff
*skb
)
243 struct rt6_info
*rt
= (struct rt6_info
*) skb_dst(skb
);
245 return rt
->rt6i_flags
& RTF_LOCAL
;
248 static inline bool ipv6_anycast_destination(const struct dst_entry
*dst
,
249 const struct in6_addr
*daddr
)
251 struct rt6_info
*rt
= (struct rt6_info
*)dst
;
253 return rt
->rt6i_flags
& RTF_ANYCAST
||
254 (rt
->rt6i_dst
.plen
< 127 &&
255 !(rt
->rt6i_flags
& (RTF_GATEWAY
| RTF_NONEXTHOP
)) &&
256 ipv6_addr_equal(&rt
->rt6i_dst
.addr
, daddr
));
259 int ip6_fragment(struct net
*net
, struct sock
*sk
, struct sk_buff
*skb
,
260 int (*output
)(struct net
*, struct sock
*, struct sk_buff
*));
262 static inline unsigned int ip6_skb_dst_mtu(const struct sk_buff
*skb
)
264 const struct ipv6_pinfo
*np
= skb
->sk
&& !dev_recursion_level() ?
265 inet6_sk(skb
->sk
) : NULL
;
266 const struct dst_entry
*dst
= skb_dst(skb
);
269 if (np
&& READ_ONCE(np
->pmtudisc
) >= IPV6_PMTUDISC_PROBE
) {
270 mtu
= READ_ONCE(dst
->dev
->mtu
);
271 mtu
-= lwtunnel_headroom(dst
->lwtstate
, mtu
);
278 static inline bool ip6_sk_accept_pmtu(const struct sock
*sk
)
280 u8 pmtudisc
= READ_ONCE(inet6_sk(sk
)->pmtudisc
);
282 return pmtudisc
!= IPV6_PMTUDISC_INTERFACE
&&
283 pmtudisc
!= IPV6_PMTUDISC_OMIT
;
286 static inline bool ip6_sk_ignore_df(const struct sock
*sk
)
288 u8 pmtudisc
= READ_ONCE(inet6_sk(sk
)->pmtudisc
);
290 return pmtudisc
< IPV6_PMTUDISC_DO
||
291 pmtudisc
== IPV6_PMTUDISC_OMIT
;
294 static inline const struct in6_addr
*rt6_nexthop(const struct rt6_info
*rt
,
295 const struct in6_addr
*daddr
)
297 if (rt
->rt6i_flags
& RTF_GATEWAY
)
298 return &rt
->rt6i_gateway
;
299 else if (unlikely(rt
->rt6i_flags
& RTF_CACHE
))
300 return &rt
->rt6i_dst
.addr
;
305 static inline bool rt6_duplicate_nexthop(struct fib6_info
*a
, struct fib6_info
*b
)
307 struct fib6_nh
*nha
, *nhb
;
310 return nexthop_cmp(a
->nh
, b
->nh
);
314 return nha
->fib_nh_dev
== nhb
->fib_nh_dev
&&
315 ipv6_addr_equal(&nha
->fib_nh_gw6
, &nhb
->fib_nh_gw6
) &&
316 !lwtunnel_cmp_encap(nha
->fib_nh_lws
, nhb
->fib_nh_lws
);
319 static inline unsigned int ip6_dst_mtu_maybe_forward(const struct dst_entry
*dst
,
322 struct inet6_dev
*idev
;
325 if (!forwarding
|| dst_metric_locked(dst
, RTAX_MTU
)) {
326 mtu
= dst_metric_raw(dst
, RTAX_MTU
);
333 idev
= __in6_dev_get(dst
->dev
);
335 mtu
= READ_ONCE(idev
->cnf
.mtu6
);
339 return mtu
- lwtunnel_headroom(dst
->lwtstate
, mtu
);
342 u32
ip6_mtu_from_fib6(const struct fib6_result
*res
,
343 const struct in6_addr
*daddr
,
344 const struct in6_addr
*saddr
);
346 struct neighbour
*ip6_neigh_lookup(const struct in6_addr
*gw
,
347 struct net_device
*dev
, struct sk_buff
*skb
,