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1#ifndef _NET_IP6_ROUTE_H
2#define _NET_IP6_ROUTE_H
3
4#define IP6_RT_PRIO_USER 1024
5#define IP6_RT_PRIO_ADDRCONF 256
6
7struct route_info {
8 __u8 type;
9 __u8 length;
10 __u8 prefix_len;
11#if defined(__BIG_ENDIAN_BITFIELD)
12 __u8 reserved_h:3,
13 route_pref:2,
14 reserved_l:3;
15#elif defined(__LITTLE_ENDIAN_BITFIELD)
16 __u8 reserved_l:3,
17 route_pref:2,
18 reserved_h:3;
19#endif
20 __be32 lifetime;
21 __u8 prefix[0]; /* 0,8 or 16 */
22};
23
24#include <net/flow.h>
25#include <net/ip6_fib.h>
26#include <net/sock.h>
27#include <linux/ip.h>
28#include <linux/ipv6.h>
29
30#define RT6_LOOKUP_F_IFACE 0x00000001
31#define RT6_LOOKUP_F_REACHABLE 0x00000002
32#define RT6_LOOKUP_F_HAS_SADDR 0x00000004
33#define RT6_LOOKUP_F_SRCPREF_TMP 0x00000008
34#define RT6_LOOKUP_F_SRCPREF_PUBLIC 0x00000010
35#define RT6_LOOKUP_F_SRCPREF_COA 0x00000020
36
37/*
38 * rt6_srcprefs2flags() and rt6_flags2srcprefs() translate
39 * between IPV6_ADDR_PREFERENCES socket option values
40 * IPV6_PREFER_SRC_TMP = 0x1
41 * IPV6_PREFER_SRC_PUBLIC = 0x2
42 * IPV6_PREFER_SRC_COA = 0x4
43 * and above RT6_LOOKUP_F_SRCPREF_xxx flags.
44 */
45static inline int rt6_srcprefs2flags(unsigned int srcprefs)
46{
47 /* No need to bitmask because srcprefs have only 3 bits. */
48 return srcprefs << 3;
49}
50
51static inline unsigned int rt6_flags2srcprefs(int flags)
52{
53 return (flags >> 3) & 7;
54}
55
56extern void rt6_bind_peer(struct rt6_info *rt,
57 int create);
58
59static inline struct inet_peer *rt6_get_peer(struct rt6_info *rt)
60{
61 if (rt->rt6i_peer)
62 return rt->rt6i_peer;
63
64 rt6_bind_peer(rt, 0);
65 return rt->rt6i_peer;
66}
67
68extern void ip6_route_input(struct sk_buff *skb);
69
70extern struct dst_entry * ip6_route_output(struct net *net,
71 const struct sock *sk,
72 struct flowi6 *fl6);
73
74extern int ip6_route_init(void);
75extern void ip6_route_cleanup(void);
76
77extern int ipv6_route_ioctl(struct net *net,
78 unsigned int cmd,
79 void __user *arg);
80
81extern int ip6_route_add(struct fib6_config *cfg);
82extern int ip6_ins_rt(struct rt6_info *);
83extern int ip6_del_rt(struct rt6_info *);
84
85extern int ip6_route_get_saddr(struct net *net,
86 struct rt6_info *rt,
87 const struct in6_addr *daddr,
88 unsigned int prefs,
89 struct in6_addr *saddr);
90
91extern struct rt6_info *rt6_lookup(struct net *net,
92 const struct in6_addr *daddr,
93 const struct in6_addr *saddr,
94 int oif, int flags);
95
96extern struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
97 struct neighbour *neigh,
98 const struct in6_addr *addr);
99extern int icmp6_dst_gc(void);
100
101extern void fib6_force_start_gc(struct net *net);
102
103extern struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
104 const struct in6_addr *addr,
105 int anycast);
106
107extern int ip6_dst_hoplimit(struct dst_entry *dst);
108
109/*
110 * support functions for ND
111 *
112 */
113extern struct rt6_info * rt6_get_dflt_router(const struct in6_addr *addr,
114 struct net_device *dev);
115extern struct rt6_info * rt6_add_dflt_router(const struct in6_addr *gwaddr,
116 struct net_device *dev,
117 unsigned int pref);
118
119extern void rt6_purge_dflt_routers(struct net *net);
120
121extern int rt6_route_rcv(struct net_device *dev,
122 u8 *opt, int len,
123 const struct in6_addr *gwaddr);
124
125extern void rt6_redirect(const struct in6_addr *dest,
126 const struct in6_addr *src,
127 const struct in6_addr *saddr,
128 struct neighbour *neigh,
129 u8 *lladdr,
130 int on_link);
131
132extern void rt6_pmtu_discovery(const struct in6_addr *daddr,
133 const struct in6_addr *saddr,
134 struct net_device *dev,
135 u32 pmtu);
136
137struct netlink_callback;
138
139struct rt6_rtnl_dump_arg {
140 struct sk_buff *skb;
141 struct netlink_callback *cb;
142 struct net *net;
143};
144
145extern int rt6_dump_route(struct rt6_info *rt, void *p_arg);
146extern void rt6_ifdown(struct net *net, struct net_device *dev);
147extern void rt6_mtu_change(struct net_device *dev, unsigned mtu);
148extern void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
149
150
151/*
152 * Store a destination cache entry in a socket
153 */
154static inline void __ip6_dst_store(struct sock *sk, struct dst_entry *dst,
155 struct in6_addr *daddr, struct in6_addr *saddr)
156{
157 struct ipv6_pinfo *np = inet6_sk(sk);
158 struct rt6_info *rt = (struct rt6_info *) dst;
159
160 sk_setup_caps(sk, dst);
161 np->daddr_cache = daddr;
162#ifdef CONFIG_IPV6_SUBTREES
163 np->saddr_cache = saddr;
164#endif
165 np->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
166}
167
168static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
169 struct in6_addr *daddr, struct in6_addr *saddr)
170{
171 spin_lock(&sk->sk_dst_lock);
172 __ip6_dst_store(sk, dst, daddr, saddr);
173 spin_unlock(&sk->sk_dst_lock);
174}
175
176static inline int ipv6_unicast_destination(struct sk_buff *skb)
177{
178 struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
179
180 return rt->rt6i_flags & RTF_LOCAL;
181}
182
183int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
184
185static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
186{
187 struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL;
188
189 return (np && np->pmtudisc == IPV6_PMTUDISC_PROBE) ?
190 skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
191}
192
193#endif
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _NET_IP6_ROUTE_H
3#define _NET_IP6_ROUTE_H
4
5#include <net/addrconf.h>
6#include <net/flow.h>
7#include <net/ip6_fib.h>
8#include <net/sock.h>
9#include <net/lwtunnel.h>
10#include <linux/ip.h>
11#include <linux/ipv6.h>
12#include <linux/route.h>
13#include <net/nexthop.h>
14
15struct route_info {
16 __u8 type;
17 __u8 length;
18 __u8 prefix_len;
19#if defined(__BIG_ENDIAN_BITFIELD)
20 __u8 reserved_h:3,
21 route_pref:2,
22 reserved_l:3;
23#elif defined(__LITTLE_ENDIAN_BITFIELD)
24 __u8 reserved_l:3,
25 route_pref:2,
26 reserved_h:3;
27#endif
28 __be32 lifetime;
29 __u8 prefix[]; /* 0,8 or 16 */
30};
31
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
40
41/* We do not (yet ?) support IPv6 jumbograms (RFC 2675)
42 * Unlike IPv4, hdr->seg_len doesn't include the IPv6 header
43 */
44#define IP6_MAX_MTU (0xFFFF + sizeof(struct ipv6hdr))
45
46/*
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.
53 */
54static inline int rt6_srcprefs2flags(unsigned int srcprefs)
55{
56 return (srcprefs & IPV6_PREFER_SRC_MASK) << 3;
57}
58
59static inline unsigned int rt6_flags2srcprefs(int flags)
60{
61 return (flags >> 3) & IPV6_PREFER_SRC_MASK;
62}
63
64static inline bool rt6_need_strict(const struct in6_addr *daddr)
65{
66 return ipv6_addr_type(daddr) &
67 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
68}
69
70/* fib entries using a nexthop object can not be coalesced into
71 * a multipath route
72 */
73static inline bool rt6_qualify_for_ecmp(const struct fib6_info *f6i)
74{
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;
78}
79
80void ip6_route_input(struct sk_buff *skb);
81struct dst_entry *ip6_route_input_lookup(struct net *net,
82 struct net_device *dev,
83 struct flowi6 *fl6,
84 const struct sk_buff *skb, int flags);
85
86struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
87 struct flowi6 *fl6, int flags);
88
89static inline struct dst_entry *ip6_route_output(struct net *net,
90 const struct sock *sk,
91 struct flowi6 *fl6)
92{
93 return ip6_route_output_flags(net, sk, fl6, 0);
94}
95
96/* Only conditionally release dst if flags indicates
97 * !RT6_LOOKUP_F_DST_NOREF or dst is in uncached_list.
98 */
99static inline void ip6_rt_put_flags(struct rt6_info *rt, int flags)
100{
101 if (!(flags & RT6_LOOKUP_F_DST_NOREF) ||
102 !list_empty(&rt->dst.rt_uncached))
103 ip6_rt_put(rt);
104}
105
106struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
107 const struct sk_buff *skb, int flags);
108struct 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);
111
112void ip6_route_init_special_entries(void);
113int ip6_route_init(void);
114void ip6_route_cleanup(void);
115
116int ipv6_route_ioctl(struct net *net, unsigned int cmd,
117 struct in6_rtmsg *rtmsg);
118
119int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags,
120 struct netlink_ext_ack *extack);
121int ip6_ins_rt(struct net *net, struct fib6_info *f6i);
122int ip6_del_rt(struct net *net, struct fib6_info *f6i, bool skip_notify);
123
124void rt6_flush_exceptions(struct fib6_info *f6i);
125void rt6_age_exceptions(struct fib6_info *f6i, struct fib6_gc_args *gc_args,
126 unsigned long now);
127
128static inline int ip6_route_get_saddr(struct net *net, struct fib6_info *f6i,
129 const struct in6_addr *daddr,
130 unsigned int prefs,
131 struct in6_addr *saddr)
132{
133 int err = 0;
134
135 if (f6i && f6i->fib6_prefsrc.plen) {
136 *saddr = f6i->fib6_prefsrc.addr;
137 } else {
138 struct net_device *dev = f6i ? fib6_info_nh_dev(f6i) : NULL;
139
140 err = ipv6_dev_get_saddr(net, dev, daddr, prefs, saddr);
141 }
142
143 return err;
144}
145
146struct 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);
149u32 rt6_multipath_hash(const struct net *net, const struct flowi6 *fl6,
150 const struct sk_buff *skb, struct flow_keys *hkeys);
151
152struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6);
153
154void fib6_force_start_gc(struct net *net);
155
156struct 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);
159
160struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
161 int flags);
162
163/*
164 * support functions for ND
165 *
166 */
167struct fib6_info *rt6_get_dflt_router(struct net *net,
168 const struct in6_addr *addr,
169 struct net_device *dev);
170struct 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);
174
175void rt6_purge_dflt_routers(struct net *net);
176
177int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
178 const struct in6_addr *gwaddr);
179
180void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif,
181 u32 mark, kuid_t uid);
182void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu);
183void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,
184 kuid_t uid);
185void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif);
186void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk);
187
188struct netlink_callback;
189
190struct rt6_rtnl_dump_arg {
191 struct sk_buff *skb;
192 struct netlink_callback *cb;
193 struct net *net;
194 struct fib_dump_filter filter;
195};
196
197int rt6_dump_route(struct fib6_info *f6i, void *p_arg, unsigned int skip);
198void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
199void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
200void rt6_clean_tohost(struct net *net, struct in6_addr *gateway);
201void rt6_sync_up(struct net_device *dev, unsigned char nh_flags);
202void rt6_disable_ip(struct net_device *dev, unsigned long event);
203void rt6_sync_down_dev(struct net_device *dev, unsigned long event);
204void rt6_multipath_rebalance(struct fib6_info *f6i);
205
206void rt6_uncached_list_add(struct rt6_info *rt);
207void rt6_uncached_list_del(struct rt6_info *rt);
208
209static inline const struct rt6_info *skb_rt6_info(const struct sk_buff *skb)
210{
211 const struct dst_entry *dst = skb_dst(skb);
212 const struct rt6_info *rt6 = NULL;
213
214 if (dst)
215 rt6 = container_of(dst, struct rt6_info, dst);
216
217 return rt6;
218}
219
220/*
221 * Store a destination cache entry in a socket
222 */
223static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
224 const struct in6_addr *daddr,
225 const struct in6_addr *saddr)
226{
227 struct ipv6_pinfo *np = inet6_sk(sk);
228
229 np->dst_cookie = rt6_get_cookie((struct rt6_info *)dst);
230 sk_setup_caps(sk, dst);
231 np->daddr_cache = daddr;
232#ifdef CONFIG_IPV6_SUBTREES
233 np->saddr_cache = saddr;
234#endif
235}
236
237void ip6_sk_dst_store_flow(struct sock *sk, struct dst_entry *dst,
238 const struct flowi6 *fl6);
239
240static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
241{
242 struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
243
244 return rt->rt6i_flags & RTF_LOCAL;
245}
246
247static inline bool ipv6_anycast_destination(const struct dst_entry *dst,
248 const struct in6_addr *daddr)
249{
250 struct rt6_info *rt = (struct rt6_info *)dst;
251
252 return rt->rt6i_flags & RTF_ANYCAST ||
253 (rt->rt6i_dst.plen < 127 &&
254 !(rt->rt6i_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) &&
255 ipv6_addr_equal(&rt->rt6i_dst.addr, daddr));
256}
257
258int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
259 int (*output)(struct net *, struct sock *, struct sk_buff *));
260
261static inline unsigned int ip6_skb_dst_mtu(const struct sk_buff *skb)
262{
263 const struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?
264 inet6_sk(skb->sk) : NULL;
265 const struct dst_entry *dst = skb_dst(skb);
266 unsigned int mtu;
267
268 if (np && READ_ONCE(np->pmtudisc) >= IPV6_PMTUDISC_PROBE) {
269 mtu = READ_ONCE(dst->dev->mtu);
270 mtu -= lwtunnel_headroom(dst->lwtstate, mtu);
271 } else {
272 mtu = dst_mtu(dst);
273 }
274 return mtu;
275}
276
277static inline bool ip6_sk_accept_pmtu(const struct sock *sk)
278{
279 u8 pmtudisc = READ_ONCE(inet6_sk(sk)->pmtudisc);
280
281 return pmtudisc != IPV6_PMTUDISC_INTERFACE &&
282 pmtudisc != IPV6_PMTUDISC_OMIT;
283}
284
285static inline bool ip6_sk_ignore_df(const struct sock *sk)
286{
287 u8 pmtudisc = READ_ONCE(inet6_sk(sk)->pmtudisc);
288
289 return pmtudisc < IPV6_PMTUDISC_DO ||
290 pmtudisc == IPV6_PMTUDISC_OMIT;
291}
292
293static inline const struct in6_addr *rt6_nexthop(const struct rt6_info *rt,
294 const struct in6_addr *daddr)
295{
296 if (rt->rt6i_flags & RTF_GATEWAY)
297 return &rt->rt6i_gateway;
298 else if (unlikely(rt->rt6i_flags & RTF_CACHE))
299 return &rt->rt6i_dst.addr;
300 else
301 return daddr;
302}
303
304static inline bool rt6_duplicate_nexthop(struct fib6_info *a, struct fib6_info *b)
305{
306 struct fib6_nh *nha, *nhb;
307
308 if (a->nh || b->nh)
309 return nexthop_cmp(a->nh, b->nh);
310
311 nha = a->fib6_nh;
312 nhb = b->fib6_nh;
313 return nha->fib_nh_dev == nhb->fib_nh_dev &&
314 ipv6_addr_equal(&nha->fib_nh_gw6, &nhb->fib_nh_gw6) &&
315 !lwtunnel_cmp_encap(nha->fib_nh_lws, nhb->fib_nh_lws);
316}
317
318static inline unsigned int ip6_dst_mtu_maybe_forward(const struct dst_entry *dst,
319 bool forwarding)
320{
321 struct inet6_dev *idev;
322 unsigned int mtu;
323
324 if (!forwarding || dst_metric_locked(dst, RTAX_MTU)) {
325 mtu = dst_metric_raw(dst, RTAX_MTU);
326 if (mtu)
327 goto out;
328 }
329
330 mtu = IPV6_MIN_MTU;
331 rcu_read_lock();
332 idev = __in6_dev_get(dst->dev);
333 if (idev)
334 mtu = idev->cnf.mtu6;
335 rcu_read_unlock();
336
337out:
338 return mtu - lwtunnel_headroom(dst->lwtstate, mtu);
339}
340
341u32 ip6_mtu_from_fib6(const struct fib6_result *res,
342 const struct in6_addr *daddr,
343 const struct in6_addr *saddr);
344
345struct neighbour *ip6_neigh_lookup(const struct in6_addr *gw,
346 struct net_device *dev, struct sk_buff *skb,
347 const void *daddr);
348#endif