1 #ifndef _NET_IP6_ROUTE_H
2 #define _NET_IP6_ROUTE_H
3
4 struct 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 /*
36 * rt6_srcprefs2flags() and rt6_flags2srcprefs() translate
37 * between IPV6_ADDR_PREFERENCES socket option values
38 * IPV6_PREFER_SRC_TMP = 0x1
39 * IPV6_PREFER_SRC_PUBLIC = 0x2
40 * IPV6_PREFER_SRC_COA = 0x4
41 * and above RT6_LOOKUP_F_SRCPREF_xxx flags.
42 */
rt6_srcprefs2flags(unsigned int srcprefs)43 static inline int rt6_srcprefs2flags(unsigned int srcprefs)
44 {
45 /* No need to bitmask because srcprefs have only 3 bits. */
46 return srcprefs << 3;
47 }
48
rt6_flags2srcprefs(int flags)49 static inline unsigned int rt6_flags2srcprefs(int flags)
50 {
51 return (flags >> 3) & 7;
52 }
53
54 extern void rt6_bind_peer(struct rt6_info *rt, int create);
55
__rt6_get_peer(struct rt6_info * rt,int create)56 static inline struct inet_peer *__rt6_get_peer(struct rt6_info *rt, int create)
57 {
58 if (rt6_has_peer(rt))
59 return rt6_peer_ptr(rt);
60
61 rt6_bind_peer(rt, create);
62 return (rt6_has_peer(rt) ? rt6_peer_ptr(rt) : NULL);
63 }
64
rt6_get_peer(struct rt6_info * rt)65 static inline struct inet_peer *rt6_get_peer(struct rt6_info *rt)
66 {
67 return __rt6_get_peer(rt, 0);
68 }
69
rt6_get_peer_create(struct rt6_info * rt)70 static inline struct inet_peer *rt6_get_peer_create(struct rt6_info *rt)
71 {
72 return __rt6_get_peer(rt, 1);
73 }
74
75 extern void ip6_route_input(struct sk_buff *skb);
76
77 extern struct dst_entry * ip6_route_output(struct net *net,
78 const struct sock *sk,
79 struct flowi6 *fl6);
80 extern struct dst_entry * ip6_route_lookup(struct net *net,
81 struct flowi6 *fl6, int flags);
82
83 extern int ip6_route_init(void);
84 extern void ip6_route_cleanup(void);
85
86 extern int ipv6_route_ioctl(struct net *net,
87 unsigned int cmd,
88 void __user *arg);
89
90 extern int ip6_route_add(struct fib6_config *cfg);
91 extern int ip6_ins_rt(struct rt6_info *);
92 extern int ip6_del_rt(struct rt6_info *);
93
94 extern int ip6_route_get_saddr(struct net *net,
95 struct rt6_info *rt,
96 const struct in6_addr *daddr,
97 unsigned int prefs,
98 struct in6_addr *saddr);
99
100 extern struct rt6_info *rt6_lookup(struct net *net,
101 const struct in6_addr *daddr,
102 const struct in6_addr *saddr,
103 int oif, int flags);
104
105 extern struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
106 struct flowi6 *fl6);
107 extern int icmp6_dst_gc(void);
108
109 extern void fib6_force_start_gc(struct net *net);
110
111 extern struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
112 const struct in6_addr *addr,
113 bool anycast);
114
115 extern int ip6_dst_hoplimit(struct dst_entry *dst);
116
117 /*
118 * support functions for ND
119 *
120 */
121 extern struct rt6_info * rt6_get_dflt_router(const struct in6_addr *addr,
122 struct net_device *dev);
123 extern struct rt6_info * rt6_add_dflt_router(const struct in6_addr *gwaddr,
124 struct net_device *dev,
125 unsigned int pref);
126
127 extern void rt6_purge_dflt_routers(struct net *net);
128
129 extern int rt6_route_rcv(struct net_device *dev,
130 u8 *opt, int len,
131 const struct in6_addr *gwaddr);
132
133 extern void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
134 int oif, u32 mark, kuid_t uid);
135 extern void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk,
136 __be32 mtu);
137 extern void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,
138 kuid_t uid);
139 extern void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk);
140
141 struct netlink_callback;
142
143 struct rt6_rtnl_dump_arg {
144 struct sk_buff *skb;
145 struct netlink_callback *cb;
146 struct net *net;
147 };
148
149 extern int rt6_dump_route(struct rt6_info *rt, void *p_arg);
150 extern void rt6_ifdown(struct net *net, struct net_device *dev);
151 extern void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
152 extern void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
153
154
155 /*
156 * Store a destination cache entry in a socket
157 */
__ip6_dst_store(struct sock * sk,struct dst_entry * dst,const struct in6_addr * daddr,const struct in6_addr * saddr)158 static inline void __ip6_dst_store(struct sock *sk, struct dst_entry *dst,
159 const struct in6_addr *daddr,
160 const struct in6_addr *saddr)
161 {
162 struct ipv6_pinfo *np = inet6_sk(sk);
163 struct rt6_info *rt = (struct rt6_info *) dst;
164
165 sk_setup_caps(sk, dst);
166 np->daddr_cache = daddr;
167 #ifdef CONFIG_IPV6_SUBTREES
168 np->saddr_cache = saddr;
169 #endif
170 np->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
171 }
172
ip6_dst_store(struct sock * sk,struct dst_entry * dst,struct in6_addr * daddr,struct in6_addr * saddr)173 static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
174 struct in6_addr *daddr, struct in6_addr *saddr)
175 {
176 spin_lock(&sk->sk_dst_lock);
177 __ip6_dst_store(sk, dst, daddr, saddr);
178 spin_unlock(&sk->sk_dst_lock);
179 }
180
ipv6_unicast_destination(const struct sk_buff * skb)181 static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
182 {
183 struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
184
185 return rt->rt6i_flags & RTF_LOCAL;
186 }
187
188 int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
189
ip6_skb_dst_mtu(struct sk_buff * skb)190 static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
191 {
192 struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL;
193
194 return (np && np->pmtudisc == IPV6_PMTUDISC_PROBE) ?
195 skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
196 }
197
rt6_nexthop(struct rt6_info * rt,struct in6_addr * dest)198 static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt, struct in6_addr *dest)
199 {
200 if (rt->rt6i_flags & RTF_GATEWAY)
201 return &rt->rt6i_gateway;
202 return dest;
203 }
204
205 #endif
206