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1#ifndef _NET_IP6_ROUTE_H
2#define _NET_IP6_ROUTE_H
3
4struct route_info {
5 __u8 type;
6 __u8 length;
7 __u8 prefix_len;
8#if defined(__BIG_ENDIAN_BITFIELD)
9 __u8 reserved_h:3,
10 route_pref:2,
11 reserved_l:3;
12#elif defined(__LITTLE_ENDIAN_BITFIELD)
13 __u8 reserved_l:3,
14 route_pref:2,
15 reserved_h:3;
16#endif
17 __be32 lifetime;
18 __u8 prefix[0]; /* 0,8 or 16 */
19};
20
21#include <net/flow.h>
22#include <net/ip6_fib.h>
23#include <net/sock.h>
24#include <linux/ip.h>
25#include <linux/ipv6.h>
26#include <linux/route.h>
27
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
34
35/* We do not (yet ?) support IPv6 jumbograms (RFC 2675)
36 * Unlike IPv4, hdr->seg_len doesn't include the IPv6 header
37 */
38#define IP6_MAX_MTU (0xFFFF + sizeof(struct ipv6hdr))
39
40/*
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.
47 */
48static inline int rt6_srcprefs2flags(unsigned int srcprefs)
49{
50 /* No need to bitmask because srcprefs have only 3 bits. */
51 return srcprefs << 3;
52}
53
54static inline unsigned int rt6_flags2srcprefs(int flags)
55{
56 return (flags >> 3) & 7;
57}
58
59static inline bool rt6_need_strict(const struct in6_addr *daddr)
60{
61 return ipv6_addr_type(daddr) &
62 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
63}
64
65void ip6_route_input(struct sk_buff *skb);
66
67struct dst_entry *ip6_route_output(struct net *net, const struct sock *sk,
68 struct flowi6 *fl6);
69struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
70 int flags);
71
72int ip6_route_init(void);
73void ip6_route_cleanup(void);
74
75int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg);
76
77int ip6_route_add(struct fib6_config *cfg);
78int ip6_ins_rt(struct rt6_info *);
79int ip6_del_rt(struct rt6_info *);
80
81int 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);
84
85struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
86 const struct in6_addr *saddr, int oif, int flags);
87
88struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6);
89int icmp6_dst_gc(void);
90
91void fib6_force_start_gc(struct net *net);
92
93struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
94 const struct in6_addr *addr, bool anycast);
95
96/*
97 * support functions for ND
98 *
99 */
100struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr,
101 struct net_device *dev);
102struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
103 struct net_device *dev, unsigned int pref);
104
105void rt6_purge_dflt_routers(struct net *net);
106
107int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
108 const struct in6_addr *gwaddr);
109
110void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif,
111 u32 mark);
112void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu);
113void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark);
114void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
115 u32 mark);
116void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk);
117
118struct netlink_callback;
119
120struct rt6_rtnl_dump_arg {
121 struct sk_buff *skb;
122 struct netlink_callback *cb;
123 struct net *net;
124};
125
126int rt6_dump_route(struct rt6_info *rt, void *p_arg);
127void rt6_ifdown(struct net *net, struct net_device *dev);
128void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
129void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
130void rt6_clean_tohost(struct net *net, struct in6_addr *gateway);
131
132
133/*
134 * Store a destination cache entry in a socket
135 */
136static inline void __ip6_dst_store(struct sock *sk, struct dst_entry *dst,
137 const struct in6_addr *daddr,
138 const struct in6_addr *saddr)
139{
140 struct ipv6_pinfo *np = inet6_sk(sk);
141 struct rt6_info *rt = (struct rt6_info *) dst;
142
143 sk_setup_caps(sk, dst);
144 np->daddr_cache = daddr;
145#ifdef CONFIG_IPV6_SUBTREES
146 np->saddr_cache = saddr;
147#endif
148 np->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
149}
150
151static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
152 struct in6_addr *daddr, struct in6_addr *saddr)
153{
154 spin_lock(&sk->sk_dst_lock);
155 __ip6_dst_store(sk, dst, daddr, saddr);
156 spin_unlock(&sk->sk_dst_lock);
157}
158
159static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
160{
161 struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
162
163 return rt->rt6i_flags & RTF_LOCAL;
164}
165
166static inline bool ipv6_anycast_destination(const struct sk_buff *skb)
167{
168 struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
169
170 return rt->rt6i_flags & RTF_ANYCAST;
171}
172
173int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
174
175static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
176{
177 struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL;
178
179 return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ?
180 skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
181}
182
183static inline bool ip6_sk_accept_pmtu(const struct sock *sk)
184{
185 return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE &&
186 inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT;
187}
188
189static inline bool ip6_sk_local_df(const struct sock *sk)
190{
191 return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO ||
192 inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT;
193}
194
195static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt)
196{
197 return &rt->rt6i_gateway;
198}
199
200#endif
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _NET_IP6_ROUTE_H
3#define _NET_IP6_ROUTE_H
4
5struct route_info {
6 __u8 type;
7 __u8 length;
8 __u8 prefix_len;
9#if defined(__BIG_ENDIAN_BITFIELD)
10 __u8 reserved_h:3,
11 route_pref:2,
12 reserved_l:3;
13#elif defined(__LITTLE_ENDIAN_BITFIELD)
14 __u8 reserved_l:3,
15 route_pref:2,
16 reserved_h:3;
17#endif
18 __be32 lifetime;
19 __u8 prefix[0]; /* 0,8 or 16 */
20};
21
22#include <net/addrconf.h>
23#include <net/flow.h>
24#include <net/ip6_fib.h>
25#include <net/sock.h>
26#include <net/lwtunnel.h>
27#include <linux/ip.h>
28#include <linux/ipv6.h>
29#include <linux/route.h>
30
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
38
39/* We do not (yet ?) support IPv6 jumbograms (RFC 2675)
40 * Unlike IPv4, hdr->seg_len doesn't include the IPv6 header
41 */
42#define IP6_MAX_MTU (0xFFFF + sizeof(struct ipv6hdr))
43
44/*
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.
51 */
52static inline int rt6_srcprefs2flags(unsigned int srcprefs)
53{
54 /* No need to bitmask because srcprefs have only 3 bits. */
55 return srcprefs << 3;
56}
57
58static inline unsigned int rt6_flags2srcprefs(int flags)
59{
60 return (flags >> 3) & 7;
61}
62
63static inline bool rt6_need_strict(const struct in6_addr *daddr)
64{
65 return ipv6_addr_type(daddr) &
66 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
67}
68
69static inline bool rt6_qualify_for_ecmp(const struct rt6_info *rt)
70{
71 return (rt->rt6i_flags & (RTF_GATEWAY|RTF_ADDRCONF|RTF_DYNAMIC)) ==
72 RTF_GATEWAY;
73}
74
75void ip6_route_input(struct sk_buff *skb);
76struct dst_entry *ip6_route_input_lookup(struct net *net,
77 struct net_device *dev,
78 struct flowi6 *fl6,
79 const struct sk_buff *skb, int flags);
80
81struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
82 struct flowi6 *fl6, int flags);
83
84static inline struct dst_entry *ip6_route_output(struct net *net,
85 const struct sock *sk,
86 struct flowi6 *fl6)
87{
88 return ip6_route_output_flags(net, sk, fl6, 0);
89}
90
91struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
92 const struct sk_buff *skb, int flags);
93struct 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);
96
97void ip6_route_init_special_entries(void);
98int ip6_route_init(void);
99void ip6_route_cleanup(void);
100
101int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg);
102
103int ip6_route_add(struct fib6_config *cfg, struct netlink_ext_ack *extack);
104int ip6_ins_rt(struct rt6_info *);
105int ip6_del_rt(struct rt6_info *);
106
107void rt6_flush_exceptions(struct rt6_info *rt);
108int rt6_remove_exception_rt(struct rt6_info *rt);
109void rt6_age_exceptions(struct rt6_info *rt, struct fib6_gc_args *gc_args,
110 unsigned long now);
111
112static inline int ip6_route_get_saddr(struct net *net, struct rt6_info *rt,
113 const struct in6_addr *daddr,
114 unsigned int prefs,
115 struct in6_addr *saddr)
116{
117 struct inet6_dev *idev =
118 rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL;
119 int err = 0;
120
121 if (rt && rt->rt6i_prefsrc.plen)
122 *saddr = rt->rt6i_prefsrc.addr;
123 else
124 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
125 daddr, prefs, saddr);
126
127 return err;
128}
129
130struct 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);
133u32 rt6_multipath_hash(const struct net *net, const struct flowi6 *fl6,
134 const struct sk_buff *skb, struct flow_keys *hkeys);
135
136struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6);
137
138void fib6_force_start_gc(struct net *net);
139
140struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
141 const struct in6_addr *addr, bool anycast);
142
143struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
144 int flags);
145
146/*
147 * support functions for ND
148 *
149 */
150struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr,
151 struct net_device *dev);
152struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
153 struct net_device *dev, unsigned int pref);
154
155void rt6_purge_dflt_routers(struct net *net);
156
157int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
158 const struct in6_addr *gwaddr);
159
160void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif,
161 u32 mark, kuid_t uid);
162void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu);
163void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,
164 kuid_t uid);
165void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
166 u32 mark);
167void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk);
168
169struct netlink_callback;
170
171struct rt6_rtnl_dump_arg {
172 struct sk_buff *skb;
173 struct netlink_callback *cb;
174 struct net *net;
175};
176
177int rt6_dump_route(struct rt6_info *rt, void *p_arg);
178void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
179void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
180void rt6_clean_tohost(struct net *net, struct in6_addr *gateway);
181void rt6_sync_up(struct net_device *dev, unsigned int nh_flags);
182void rt6_disable_ip(struct net_device *dev, unsigned long event);
183void rt6_sync_down_dev(struct net_device *dev, unsigned long event);
184void rt6_multipath_rebalance(struct rt6_info *rt);
185
186void rt6_uncached_list_add(struct rt6_info *rt);
187void rt6_uncached_list_del(struct rt6_info *rt);
188
189static inline const struct rt6_info *skb_rt6_info(const struct sk_buff *skb)
190{
191 const struct dst_entry *dst = skb_dst(skb);
192 const struct rt6_info *rt6 = NULL;
193
194 if (dst)
195 rt6 = container_of(dst, struct rt6_info, dst);
196
197 return rt6;
198}
199
200/*
201 * Store a destination cache entry in a socket
202 */
203static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
204 const struct in6_addr *daddr,
205 const struct in6_addr *saddr)
206{
207 struct ipv6_pinfo *np = inet6_sk(sk);
208
209 np->dst_cookie = rt6_get_cookie((struct rt6_info *)dst);
210 sk_setup_caps(sk, dst);
211 np->daddr_cache = daddr;
212#ifdef CONFIG_IPV6_SUBTREES
213 np->saddr_cache = saddr;
214#endif
215}
216
217void ip6_sk_dst_store_flow(struct sock *sk, struct dst_entry *dst,
218 const struct flowi6 *fl6);
219
220static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
221{
222 struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
223
224 return rt->rt6i_flags & RTF_LOCAL;
225}
226
227static inline bool ipv6_anycast_destination(const struct dst_entry *dst,
228 const struct in6_addr *daddr)
229{
230 struct rt6_info *rt = (struct rt6_info *)dst;
231
232 return rt->rt6i_flags & RTF_ANYCAST ||
233 (rt->rt6i_dst.plen < 127 &&
234 ipv6_addr_equal(&rt->rt6i_dst.addr, daddr));
235}
236
237int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
238 int (*output)(struct net *, struct sock *, struct sk_buff *));
239
240static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
241{
242 struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?
243 inet6_sk(skb->sk) : NULL;
244
245 return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ?
246 skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
247}
248
249static inline bool ip6_sk_accept_pmtu(const struct sock *sk)
250{
251 return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE &&
252 inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT;
253}
254
255static inline bool ip6_sk_ignore_df(const struct sock *sk)
256{
257 return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO ||
258 inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT;
259}
260
261static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt,
262 struct in6_addr *daddr)
263{
264 if (rt->rt6i_flags & RTF_GATEWAY)
265 return &rt->rt6i_gateway;
266 else if (unlikely(rt->rt6i_flags & RTF_CACHE))
267 return &rt->rt6i_dst.addr;
268 else
269 return daddr;
270}
271
272static inline bool rt6_duplicate_nexthop(struct rt6_info *a, struct rt6_info *b)
273{
274 return a->dst.dev == b->dst.dev &&
275 a->rt6i_idev == b->rt6i_idev &&
276 ipv6_addr_equal(&a->rt6i_gateway, &b->rt6i_gateway) &&
277 !lwtunnel_cmp_encap(a->dst.lwtstate, b->dst.lwtstate);
278}
279
280#endif