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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
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