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
104/*
105 *	support functions for ND
106 *
107 */
108struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr,
109				     struct net_device *dev);
110struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
111				     struct net_device *dev, unsigned int pref);
112
113void rt6_purge_dflt_routers(struct net *net);
114
115int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
116		  const struct in6_addr *gwaddr);
117
118void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif,
119		     u32 mark);
120void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu);
121void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark);
122void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
123			    u32 mark);
124void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk);
125
126struct netlink_callback;
127
128struct rt6_rtnl_dump_arg {
129	struct sk_buff *skb;
130	struct netlink_callback *cb;
131	struct net *net;
132};
133
134int rt6_dump_route(struct rt6_info *rt, void *p_arg);
135void rt6_ifdown(struct net *net, struct net_device *dev);
136void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
137void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
138void rt6_clean_tohost(struct net *net, struct in6_addr *gateway);
139
140
141/*
142 *	Store a destination cache entry in a socket
143 */
144static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
145				 const struct in6_addr *daddr,
146				 const struct in6_addr *saddr)
147{
148	struct ipv6_pinfo *np = inet6_sk(sk);
149
150	np->dst_cookie = rt6_get_cookie((struct rt6_info *)dst);
151	sk_setup_caps(sk, dst);
152	np->daddr_cache = daddr;
153#ifdef CONFIG_IPV6_SUBTREES
154	np->saddr_cache = saddr;
155#endif
156}
157
158static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
159{
160	struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
161
162	return rt->rt6i_flags & RTF_LOCAL;
163}
164
165static inline bool ipv6_anycast_destination(const struct dst_entry *dst,
166					    const struct in6_addr *daddr)
167{
168	struct rt6_info *rt = (struct rt6_info *)dst;
169
170	return rt->rt6i_flags & RTF_ANYCAST ||
171		(rt->rt6i_dst.plen != 128 &&
172		 ipv6_addr_equal(&rt->rt6i_dst.addr, daddr));
173}
174
175int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
176		 int (*output)(struct net *, struct sock *, struct sk_buff *));
177
178static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
179{
180	struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?
181				inet6_sk(skb->sk) : NULL;
182
183	return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ?
184	       skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
185}
186
187static inline bool ip6_sk_accept_pmtu(const struct sock *sk)
188{
189	return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE &&
190	       inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT;
191}
192
193static inline bool ip6_sk_ignore_df(const struct sock *sk)
194{
195	return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO ||
196	       inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT;
197}
198
199static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt,
200					   struct in6_addr *daddr)
201{
202	if (rt->rt6i_flags & RTF_GATEWAY)
203		return &rt->rt6i_gateway;
204	else if (unlikely(rt->rt6i_flags & RTF_CACHE))
205		return &rt->rt6i_dst.addr;
206	else
207		return daddr;
208}
209
210#endif
211