tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/*
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 */
43static 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
49static inline unsigned int rt6_flags2srcprefs(int flags)
50{
51 return (flags >> 3) & 7;
52}
53
54extern void rt6_bind_peer(struct rt6_info *rt, int create);
55
56static 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
65static inline struct inet_peer *rt6_get_peer(struct rt6_info *rt)
66{
67 return __rt6_get_peer(rt, 0);
68}
69
70static inline struct inet_peer *rt6_get_peer_create(struct rt6_info *rt)
71{
72 return __rt6_get_peer(rt, 1);
73}
74
75extern void ip6_route_input(struct sk_buff *skb);
76
77extern struct dst_entry * ip6_route_output(struct net *net,
78 const struct sock *sk,
79 struct flowi6 *fl6);
80extern struct dst_entry * ip6_route_lookup(struct net *net,
81 struct flowi6 *fl6, int flags);
82
83extern int ip6_route_init(void);
84extern void ip6_route_cleanup(void);
85
86extern int ipv6_route_ioctl(struct net *net,
87 unsigned int cmd,
88 void __user *arg);
89
90extern int ip6_route_add(struct fib6_config *cfg);
91extern int ip6_ins_rt(struct rt6_info *);
92extern int ip6_del_rt(struct rt6_info *);
93
94extern 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
100extern 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
105extern struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
106 struct flowi6 *fl6);
107extern int icmp6_dst_gc(void);
108
109extern void fib6_force_start_gc(struct net *net);
110
111extern struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
112 const struct in6_addr *addr,
113 bool anycast);
114
115extern int ip6_dst_hoplimit(struct dst_entry *dst);
116
117/*
118 * support functions for ND
119 *
120 */
121extern struct rt6_info * rt6_get_dflt_router(const struct in6_addr *addr,
122 struct net_device *dev);
123extern struct rt6_info * rt6_add_dflt_router(const struct in6_addr *gwaddr,
124 struct net_device *dev,
125 unsigned int pref);
126
127extern void rt6_purge_dflt_routers(struct net *net);
128
129extern int rt6_route_rcv(struct net_device *dev,
130 u8 *opt, int len,
131 const struct in6_addr *gwaddr);
132
133extern void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
134 int oif, u32 mark);
135extern void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk,
136 __be32 mtu);
137extern void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark);
138extern void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk);
139
140struct netlink_callback;
141
142struct rt6_rtnl_dump_arg {
143 struct sk_buff *skb;
144 struct netlink_callback *cb;
145 struct net *net;
146};
147
148extern int rt6_dump_route(struct rt6_info *rt, void *p_arg);
149extern void rt6_ifdown(struct net *net, struct net_device *dev);
150extern void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
151extern void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
152
153
154/*
155 * Store a destination cache entry in a socket
156 */
157static inline void __ip6_dst_store(struct sock *sk, struct dst_entry *dst,
158 const struct in6_addr *daddr,
159 const struct in6_addr *saddr)
160{
161 struct ipv6_pinfo *np = inet6_sk(sk);
162 struct rt6_info *rt = (struct rt6_info *) dst;
163
164 sk_setup_caps(sk, dst);
165 np->daddr_cache = daddr;
166#ifdef CONFIG_IPV6_SUBTREES
167 np->saddr_cache = saddr;
168#endif
169 np->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
170}
171
172static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
173 struct in6_addr *daddr, struct in6_addr *saddr)
174{
175 spin_lock(&sk->sk_dst_lock);
176 __ip6_dst_store(sk, dst, daddr, saddr);
177 spin_unlock(&sk->sk_dst_lock);
178}
179
180static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
181{
182 struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
183
184 return rt->rt6i_flags & RTF_LOCAL;
185}
186
187int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
188
189static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
190{
191 struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL;
192
193 return (np && np->pmtudisc == IPV6_PMTUDISC_PROBE) ?
194 skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
195}
196
197static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt, struct in6_addr *dest)
198{
199 if (rt->rt6i_flags & RTF_GATEWAY)
200 return &rt->rt6i_gateway;
201 return dest;
202}
203
204#endif