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Linux kernel mirror (for testing)
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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/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
36/* We do not (yet ?) support IPv6 jumbograms (RFC 2675)
37 * Unlike IPv4, hdr->seg_len doesn't include the IPv6 header
38 */
39#define IP6_MAX_MTU (0xFFFF + sizeof(struct ipv6hdr))
40
41/*
42 * rt6_srcprefs2flags() and rt6_flags2srcprefs() translate
43 * between IPV6_ADDR_PREFERENCES socket option values
44 * IPV6_PREFER_SRC_TMP = 0x1
45 * IPV6_PREFER_SRC_PUBLIC = 0x2
46 * IPV6_PREFER_SRC_COA = 0x4
47 * and above RT6_LOOKUP_F_SRCPREF_xxx flags.
48 */
49static inline int rt6_srcprefs2flags(unsigned int srcprefs)
50{
51 /* No need to bitmask because srcprefs have only 3 bits. */
52 return srcprefs << 3;
53}
54
55static inline unsigned int rt6_flags2srcprefs(int flags)
56{
57 return (flags >> 3) & 7;
58}
59
60static inline bool rt6_need_strict(const struct in6_addr *daddr)
61{
62 return ipv6_addr_type(daddr) &
63 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
64}
65
66void ip6_route_input(struct sk_buff *skb);
67
68struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
69 struct flowi6 *fl6, int flags);
70
71static inline struct dst_entry *ip6_route_output(struct net *net,
72 const struct sock *sk,
73 struct flowi6 *fl6)
74{
75 return ip6_route_output_flags(net, sk, fl6, 0);
76}
77
78struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
79 int flags);
80struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
81 int ifindex, struct flowi6 *fl6, int flags);
82
83int ip6_route_init(void);
84void ip6_route_cleanup(void);
85
86int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg);
87
88int ip6_route_add(struct fib6_config *cfg);
89int ip6_ins_rt(struct rt6_info *);
90int ip6_del_rt(struct rt6_info *);
91
92static inline int ip6_route_get_saddr(struct net *net, struct rt6_info *rt,
93 const struct in6_addr *daddr,
94 unsigned int prefs,
95 struct in6_addr *saddr)
96{
97 struct inet6_dev *idev =
98 rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL;
99 int err = 0;
100
101 if (rt && rt->rt6i_prefsrc.plen)
102 *saddr = rt->rt6i_prefsrc.addr;
103 else
104 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
105 daddr, prefs, saddr);
106
107 return err;
108}
109
110struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
111 const struct in6_addr *saddr, int oif, int flags);
112
113struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6);
114int icmp6_dst_gc(void);
115
116void fib6_force_start_gc(struct net *net);
117
118struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
119 const struct in6_addr *addr, bool anycast);
120
121struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
122 int flags);
123
124/*
125 * support functions for ND
126 *
127 */
128struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr,
129 struct net_device *dev);
130struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
131 struct net_device *dev, unsigned int pref);
132
133void rt6_purge_dflt_routers(struct net *net);
134
135int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
136 const struct in6_addr *gwaddr);
137
138void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif,
139 u32 mark);
140void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu);
141void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark);
142void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
143 u32 mark);
144void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk);
145
146struct netlink_callback;
147
148struct rt6_rtnl_dump_arg {
149 struct sk_buff *skb;
150 struct netlink_callback *cb;
151 struct net *net;
152};
153
154int rt6_dump_route(struct rt6_info *rt, void *p_arg);
155void rt6_ifdown(struct net *net, struct net_device *dev);
156void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
157void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
158void rt6_clean_tohost(struct net *net, struct in6_addr *gateway);
159
160
161/*
162 * Store a destination cache entry in a socket
163 */
164static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
165 const struct in6_addr *daddr,
166 const struct in6_addr *saddr)
167{
168 struct ipv6_pinfo *np = inet6_sk(sk);
169
170 np->dst_cookie = rt6_get_cookie((struct rt6_info *)dst);
171 sk_setup_caps(sk, dst);
172 np->daddr_cache = daddr;
173#ifdef CONFIG_IPV6_SUBTREES
174 np->saddr_cache = saddr;
175#endif
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
185static inline bool ipv6_anycast_destination(const struct dst_entry *dst,
186 const struct in6_addr *daddr)
187{
188 struct rt6_info *rt = (struct rt6_info *)dst;
189
190 return rt->rt6i_flags & RTF_ANYCAST ||
191 (rt->rt6i_dst.plen != 128 &&
192 ipv6_addr_equal(&rt->rt6i_dst.addr, daddr));
193}
194
195int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
196 int (*output)(struct net *, struct sock *, struct sk_buff *));
197
198static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
199{
200 struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?
201 inet6_sk(skb->sk) : NULL;
202
203 return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ?
204 skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
205}
206
207static inline bool ip6_sk_accept_pmtu(const struct sock *sk)
208{
209 return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE &&
210 inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT;
211}
212
213static inline bool ip6_sk_ignore_df(const struct sock *sk)
214{
215 return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO ||
216 inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT;
217}
218
219static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt,
220 struct in6_addr *daddr)
221{
222 if (rt->rt6i_flags & RTF_GATEWAY)
223 return &rt->rt6i_gateway;
224 else if (unlikely(rt->rt6i_flags & RTF_CACHE))
225 return &rt->rt6i_dst.addr;
226 else
227 return daddr;
228}
229
230#endif