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
7 struct 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 /* We do not (yet ?) support IPv6 jumbograms (RFC 2675)
38 * Unlike IPv4, hdr->seg_len doesn't include the IPv6 header
39 */
40 #define IP6_MAX_MTU (0xFFFF + sizeof(struct ipv6hdr))
41
42 /*
43 * rt6_srcprefs2flags() and rt6_flags2srcprefs() translate
44 * between IPV6_ADDR_PREFERENCES socket option values
45 * IPV6_PREFER_SRC_TMP = 0x1
46 * IPV6_PREFER_SRC_PUBLIC = 0x2
47 * IPV6_PREFER_SRC_COA = 0x4
48 * and above RT6_LOOKUP_F_SRCPREF_xxx flags.
49 */
rt6_srcprefs2flags(unsigned int srcprefs)50 static inline int rt6_srcprefs2flags(unsigned int srcprefs)
51 {
52 /* No need to bitmask because srcprefs have only 3 bits. */
53 return srcprefs << 3;
54 }
55
rt6_flags2srcprefs(int flags)56 static inline unsigned int rt6_flags2srcprefs(int flags)
57 {
58 return (flags >> 3) & 7;
59 }
60
61 extern void rt6_bind_peer(struct rt6_info *rt,
62 int create);
63
rt6_get_peer(struct rt6_info * rt)64 static inline struct inet_peer *rt6_get_peer(struct rt6_info *rt)
65 {
66 if (rt->rt6i_peer)
67 return rt->rt6i_peer;
68
69 rt6_bind_peer(rt, 0);
70 return rt->rt6i_peer;
71 }
72
73 extern void ip6_route_input(struct sk_buff *skb);
74
75 extern struct dst_entry * ip6_route_output(struct net *net,
76 const struct sock *sk,
77 struct flowi6 *fl6);
78 extern struct dst_entry * ip6_route_lookup(struct net *net,
79 struct flowi6 *fl6, int flags);
80
81 extern int ip6_route_init(void);
82 extern void ip6_route_cleanup(void);
83
84 extern int ipv6_route_ioctl(struct net *net,
85 unsigned int cmd,
86 void __user *arg);
87
88 extern int ip6_route_add(struct fib6_config *cfg);
89 extern int ip6_ins_rt(struct rt6_info *);
90 extern int ip6_del_rt(struct rt6_info *);
91
92 extern int ip6_route_get_saddr(struct net *net,
93 struct rt6_info *rt,
94 const struct in6_addr *daddr,
95 unsigned int prefs,
96 struct in6_addr *saddr);
97
98 extern struct rt6_info *rt6_lookup(struct net *net,
99 const struct in6_addr *daddr,
100 const struct in6_addr *saddr,
101 int oif, int flags);
102
103 extern struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
104 struct neighbour *neigh,
105 struct flowi6 *fl6);
106 extern int icmp6_dst_gc(void);
107
108 extern void fib6_force_start_gc(struct net *net);
109
110 extern struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
111 const struct in6_addr *addr,
112 bool anycast);
113
114 extern int ip6_dst_hoplimit(struct dst_entry *dst);
115
116 /*
117 * support functions for ND
118 *
119 */
120 extern struct rt6_info * rt6_get_dflt_router(const struct in6_addr *addr,
121 struct net_device *dev);
122 extern struct rt6_info * rt6_add_dflt_router(const struct in6_addr *gwaddr,
123 struct net_device *dev,
124 unsigned int pref);
125
126 extern void rt6_purge_dflt_routers(struct net *net);
127
128 extern int rt6_route_rcv(struct net_device *dev,
129 u8 *opt, int len,
130 const struct in6_addr *gwaddr);
131
132 extern void rt6_redirect(const struct in6_addr *dest,
133 const struct in6_addr *src,
134 const struct in6_addr *saddr,
135 struct neighbour *neigh,
136 u8 *lladdr,
137 int on_link);
138
139 extern void rt6_pmtu_discovery(const struct in6_addr *daddr,
140 const struct in6_addr *saddr,
141 struct net_device *dev,
142 u32 pmtu);
143
144 struct netlink_callback;
145
146 struct rt6_rtnl_dump_arg {
147 struct sk_buff *skb;
148 struct netlink_callback *cb;
149 struct net *net;
150 };
151
152 extern int rt6_dump_route(struct rt6_info *rt, void *p_arg);
153 extern void rt6_ifdown(struct net *net, struct net_device *dev);
154 extern void rt6_mtu_change(struct net_device *dev, unsigned mtu);
155 extern void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
156
157
158 /*
159 * Store a destination cache entry in a socket
160 */
__ip6_dst_store(struct sock * sk,struct dst_entry * dst,struct in6_addr * daddr,struct in6_addr * saddr)161 static inline void __ip6_dst_store(struct sock *sk, struct dst_entry *dst,
162 struct in6_addr *daddr, struct in6_addr *saddr)
163 {
164 struct ipv6_pinfo *np = inet6_sk(sk);
165 struct rt6_info *rt = (struct rt6_info *) dst;
166
167 sk_setup_caps(sk, dst);
168 np->daddr_cache = daddr;
169 #ifdef CONFIG_IPV6_SUBTREES
170 np->saddr_cache = saddr;
171 #endif
172 np->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
173 }
174
ip6_dst_store(struct sock * sk,struct dst_entry * dst,struct in6_addr * daddr,struct in6_addr * saddr)175 static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
176 struct in6_addr *daddr, struct in6_addr *saddr)
177 {
178 spin_lock(&sk->sk_dst_lock);
179 __ip6_dst_store(sk, dst, daddr, saddr);
180 spin_unlock(&sk->sk_dst_lock);
181 }
182
ipv6_unicast_destination(struct sk_buff * skb)183 static inline int ipv6_unicast_destination(struct sk_buff *skb)
184 {
185 struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
186
187 return rt->rt6i_flags & RTF_LOCAL;
188 }
189
190 int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
191
ip6_skb_dst_mtu(struct sk_buff * skb)192 static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
193 {
194 struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL;
195
196 return (np && np->pmtudisc == IPV6_PMTUDISC_PROBE) ?
197 skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
198 }
199
200 #endif
201