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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#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/addrconf.h>
22#include <net/flow.h>
23#include <net/ip6_fib.h>
24#include <net/sock.h>
25#include <linux/ip.h>
26#include <linux/ipv6.h>
27#include <linux/route.h>
28
29#define RT6_LOOKUP_F_IFACE 0x00000001
30#define RT6_LOOKUP_F_REACHABLE 0x00000002
31#define RT6_LOOKUP_F_HAS_SADDR 0x00000004
32#define RT6_LOOKUP_F_SRCPREF_TMP 0x00000008
33#define RT6_LOOKUP_F_SRCPREF_PUBLIC 0x00000010
34#define RT6_LOOKUP_F_SRCPREF_COA 0x00000020
35#define RT6_LOOKUP_F_IGNORE_LINKSTATE 0x00000040
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 */
50static 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
56static inline unsigned int rt6_flags2srcprefs(int flags)
57{
58 return (flags >> 3) & 7;
59}
60
61static inline bool rt6_need_strict(const struct in6_addr *daddr)
62{
63 return ipv6_addr_type(daddr) &
64 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
65}
66
67void ip6_route_input(struct sk_buff *skb);
68struct dst_entry *ip6_route_input_lookup(struct net *net,
69 struct net_device *dev,
70 struct flowi6 *fl6, int flags);
71
72struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
73 struct flowi6 *fl6, int flags);
74
75static inline struct dst_entry *ip6_route_output(struct net *net,
76 const struct sock *sk,
77 struct flowi6 *fl6)
78{
79 return ip6_route_output_flags(net, sk, fl6, 0);
80}
81
82struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
83 int flags);
84struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
85 int ifindex, struct flowi6 *fl6, int flags);
86
87int ip6_route_init(void);
88void ip6_route_cleanup(void);
89
90int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg);
91
92int ip6_route_add(struct fib6_config *cfg);
93int ip6_ins_rt(struct rt6_info *);
94int ip6_del_rt(struct rt6_info *);
95
96static inline int ip6_route_get_saddr(struct net *net, struct rt6_info *rt,
97 const struct in6_addr *daddr,
98 unsigned int prefs,
99 struct in6_addr *saddr)
100{
101 struct inet6_dev *idev =
102 rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL;
103 int err = 0;
104
105 if (rt && rt->rt6i_prefsrc.plen)
106 *saddr = rt->rt6i_prefsrc.addr;
107 else
108 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
109 daddr, prefs, saddr);
110
111 return err;
112}
113
114struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
115 const struct in6_addr *saddr, int oif, int flags);
116
117struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6);
118int icmp6_dst_gc(void);
119
120void fib6_force_start_gc(struct net *net);
121
122struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
123 const struct in6_addr *addr, bool anycast);
124
125struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
126 int flags);
127
128/*
129 * support functions for ND
130 *
131 */
132struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr,
133 struct net_device *dev);
134struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
135 struct net_device *dev, unsigned int pref);
136
137void rt6_purge_dflt_routers(struct net *net);
138
139int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
140 const struct in6_addr *gwaddr);
141
142void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif,
143 u32 mark, kuid_t uid);
144void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu);
145void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,
146 kuid_t uid);
147void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
148 u32 mark);
149void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk);
150
151struct netlink_callback;
152
153struct rt6_rtnl_dump_arg {
154 struct sk_buff *skb;
155 struct netlink_callback *cb;
156 struct net *net;
157};
158
159int rt6_dump_route(struct rt6_info *rt, void *p_arg);
160void rt6_ifdown(struct net *net, struct net_device *dev);
161void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
162void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
163void rt6_clean_tohost(struct net *net, struct in6_addr *gateway);
164
165
166/*
167 * Store a destination cache entry in a socket
168 */
169static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
170 const struct in6_addr *daddr,
171 const struct in6_addr *saddr)
172{
173 struct ipv6_pinfo *np = inet6_sk(sk);
174
175 np->dst_cookie = rt6_get_cookie((struct rt6_info *)dst);
176 sk_setup_caps(sk, dst);
177 np->daddr_cache = daddr;
178#ifdef CONFIG_IPV6_SUBTREES
179 np->saddr_cache = saddr;
180#endif
181}
182
183static inline bool ipv6_unicast_destination(const 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
190static inline bool ipv6_anycast_destination(const struct dst_entry *dst,
191 const struct in6_addr *daddr)
192{
193 struct rt6_info *rt = (struct rt6_info *)dst;
194
195 return rt->rt6i_flags & RTF_ANYCAST ||
196 (rt->rt6i_dst.plen != 128 &&
197 ipv6_addr_equal(&rt->rt6i_dst.addr, daddr));
198}
199
200int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
201 int (*output)(struct net *, struct sock *, struct sk_buff *));
202
203static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
204{
205 struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?
206 inet6_sk(skb->sk) : NULL;
207
208 return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ?
209 skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
210}
211
212static inline bool ip6_sk_accept_pmtu(const struct sock *sk)
213{
214 return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE &&
215 inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT;
216}
217
218static inline bool ip6_sk_ignore_df(const struct sock *sk)
219{
220 return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO ||
221 inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT;
222}
223
224static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt,
225 struct in6_addr *daddr)
226{
227 if (rt->rt6i_flags & RTF_GATEWAY)
228 return &rt->rt6i_gateway;
229 else if (unlikely(rt->rt6i_flags & RTF_CACHE))
230 return &rt->rt6i_dst.addr;
231 else
232 return daddr;
233}
234
235#endif