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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_flags(struct net *net, const struct sock *sk,
68 struct flowi6 *fl6, int flags);
69
70static inline struct dst_entry *ip6_route_output(struct net *net,
71 const struct sock *sk,
72 struct flowi6 *fl6)
73{
74 return ip6_route_output_flags(net, sk, fl6, 0);
75}
76
77struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
78 int flags);
79
80int ip6_route_init(void);
81void ip6_route_cleanup(void);
82
83int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg);
84
85int ip6_route_add(struct fib6_config *cfg);
86int ip6_ins_rt(struct rt6_info *);
87int ip6_del_rt(struct rt6_info *);
88
89int ip6_route_get_saddr(struct net *net, struct rt6_info *rt,
90 const struct in6_addr *daddr, unsigned int prefs,
91 struct in6_addr *saddr);
92
93struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
94 const struct in6_addr *saddr, int oif, int flags);
95
96struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6);
97int icmp6_dst_gc(void);
98
99void fib6_force_start_gc(struct net *net);
100
101struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
102 const struct in6_addr *addr, bool anycast);
103
104struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
105 int flags);
106
107/*
108 * support functions for ND
109 *
110 */
111struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr,
112 struct net_device *dev);
113struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
114 struct net_device *dev, unsigned int pref);
115
116void rt6_purge_dflt_routers(struct net *net);
117
118int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
119 const struct in6_addr *gwaddr);
120
121void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif,
122 u32 mark);
123void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu);
124void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark);
125void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
126 u32 mark);
127void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk);
128
129struct netlink_callback;
130
131struct rt6_rtnl_dump_arg {
132 struct sk_buff *skb;
133 struct netlink_callback *cb;
134 struct net *net;
135};
136
137int rt6_dump_route(struct rt6_info *rt, void *p_arg);
138void rt6_ifdown(struct net *net, struct net_device *dev);
139void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
140void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
141void rt6_clean_tohost(struct net *net, struct in6_addr *gateway);
142
143
144/*
145 * Store a destination cache entry in a socket
146 */
147static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
148 const struct in6_addr *daddr,
149 const struct in6_addr *saddr)
150{
151 struct ipv6_pinfo *np = inet6_sk(sk);
152
153 np->dst_cookie = rt6_get_cookie((struct rt6_info *)dst);
154 sk_setup_caps(sk, dst);
155 np->daddr_cache = daddr;
156#ifdef CONFIG_IPV6_SUBTREES
157 np->saddr_cache = saddr;
158#endif
159}
160
161static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
162{
163 struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
164
165 return rt->rt6i_flags & RTF_LOCAL;
166}
167
168static inline bool ipv6_anycast_destination(const struct dst_entry *dst,
169 const struct in6_addr *daddr)
170{
171 struct rt6_info *rt = (struct rt6_info *)dst;
172
173 return rt->rt6i_flags & RTF_ANYCAST ||
174 (rt->rt6i_dst.plen != 128 &&
175 ipv6_addr_equal(&rt->rt6i_dst.addr, daddr));
176}
177
178int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
179 int (*output)(struct net *, struct sock *, struct sk_buff *));
180
181static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
182{
183 struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?
184 inet6_sk(skb->sk) : NULL;
185
186 return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ?
187 skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
188}
189
190static inline bool ip6_sk_accept_pmtu(const struct sock *sk)
191{
192 return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE &&
193 inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT;
194}
195
196static inline bool ip6_sk_ignore_df(const struct sock *sk)
197{
198 return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO ||
199 inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT;
200}
201
202static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt,
203 struct in6_addr *daddr)
204{
205 if (rt->rt6i_flags & RTF_GATEWAY)
206 return &rt->rt6i_gateway;
207 else if (unlikely(rt->rt6i_flags & RTF_CACHE))
208 return &rt->rt6i_dst.addr;
209 else
210 return daddr;
211}
212
213#endif
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);
73extern struct dst_entry * ip6_route_lookup(struct net *net,
74 struct flowi6 *fl6, int flags);
75
76extern int ip6_route_init(void);
77extern void ip6_route_cleanup(void);
78
79extern int ipv6_route_ioctl(struct net *net,
80 unsigned int cmd,
81 void __user *arg);
82
83extern int ip6_route_add(struct fib6_config *cfg);
84extern int ip6_ins_rt(struct rt6_info *);
85extern int ip6_del_rt(struct rt6_info *);
86
87extern int ip6_route_get_saddr(struct net *net,
88 struct rt6_info *rt,
89 const struct in6_addr *daddr,
90 unsigned int prefs,
91 struct in6_addr *saddr);
92
93extern struct rt6_info *rt6_lookup(struct net *net,
94 const struct in6_addr *daddr,
95 const struct in6_addr *saddr,
96 int oif, int flags);
97
98extern struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
99 struct neighbour *neigh,
100 struct flowi6 *fl6);
101extern int icmp6_dst_gc(void);
102
103extern void fib6_force_start_gc(struct net *net);
104
105extern struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
106 const struct in6_addr *addr,
107 bool anycast);
108
109extern int ip6_dst_hoplimit(struct dst_entry *dst);
110
111/*
112 * support functions for ND
113 *
114 */
115extern struct rt6_info * rt6_get_dflt_router(const struct in6_addr *addr,
116 struct net_device *dev);
117extern struct rt6_info * rt6_add_dflt_router(const struct in6_addr *gwaddr,
118 struct net_device *dev,
119 unsigned int pref);
120
121extern void rt6_purge_dflt_routers(struct net *net);
122
123extern int rt6_route_rcv(struct net_device *dev,
124 u8 *opt, int len,
125 const struct in6_addr *gwaddr);
126
127extern void rt6_redirect(const struct in6_addr *dest,
128 const struct in6_addr *src,
129 const struct in6_addr *saddr,
130 struct neighbour *neigh,
131 u8 *lladdr,
132 int on_link);
133
134extern void rt6_pmtu_discovery(const struct in6_addr *daddr,
135 const struct in6_addr *saddr,
136 struct net_device *dev,
137 u32 pmtu);
138
139struct netlink_callback;
140
141struct rt6_rtnl_dump_arg {
142 struct sk_buff *skb;
143 struct netlink_callback *cb;
144 struct net *net;
145};
146
147extern int rt6_dump_route(struct rt6_info *rt, void *p_arg);
148extern void rt6_ifdown(struct net *net, struct net_device *dev);
149extern void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
150extern void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
151
152
153/*
154 * Store a destination cache entry in a socket
155 */
156static inline void __ip6_dst_store(struct sock *sk, struct dst_entry *dst,
157 struct in6_addr *daddr, struct in6_addr *saddr)
158{
159 struct ipv6_pinfo *np = inet6_sk(sk);
160 struct rt6_info *rt = (struct rt6_info *) dst;
161
162 sk_setup_caps(sk, dst);
163 np->daddr_cache = daddr;
164#ifdef CONFIG_IPV6_SUBTREES
165 np->saddr_cache = saddr;
166#endif
167 np->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
168}
169
170static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
171 struct in6_addr *daddr, struct in6_addr *saddr)
172{
173 spin_lock(&sk->sk_dst_lock);
174 __ip6_dst_store(sk, dst, daddr, saddr);
175 spin_unlock(&sk->sk_dst_lock);
176}
177
178static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
179{
180 struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
181
182 return rt->rt6i_flags & RTF_LOCAL;
183}
184
185int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
186
187static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
188{
189 struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL;
190
191 return (np && np->pmtudisc == IPV6_PMTUDISC_PROBE) ?
192 skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
193}
194
195#endif