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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _NET_IP6_ROUTE_H
2#define _NET_IP6_ROUTE_H
3
YOSHIFUJI Hideaki70ceb4f2006-03-20 17:06:24 -08004struct 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
Al Viroe69a4adc2006-11-14 20:56:00 -080017 __be32 lifetime;
YOSHIFUJI Hideaki70ceb4f2006-03-20 17:06:24 -080018 __u8 prefix[0]; /* 0,8 or 16 */
19};
20
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <net/flow.h>
22#include <net/ip6_fib.h>
23#include <net/sock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/ip.h>
25#include <linux/ipv6.h>
YOSHIFUJI Hideaki / 吉藤英明9bb5a142013-01-17 12:53:48 +000026#include <linux/route.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027
YOSHIFUJI Hideaki7cbca672008-03-25 09:37:42 +090028#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
YOSHIFUJI Hideaki77d16f42006-08-23 17:25:05 -070034
Eric Dumazet30f78d82014-04-10 21:23:36 -070035/* 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
YOSHIFUJI Hideaki / 吉藤英明0c9a2ac2010-03-07 00:14:44 +000040/*
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}
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
Wang Yufen60ea37f2014-03-29 09:27:30 +080059static 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}
David S. Millerfbfe95a2012-06-08 23:24:18 -070064
Joe Perches5c3a0fd2013-09-21 10:22:42 -070065void ip6_route_input(struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
Joe Perches5c3a0fd2013-09-21 10:22:42 -070067struct dst_entry *ip6_route_output(struct net *net, const struct sock *sk,
68 struct flowi6 *fl6);
69struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
70 int flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
Joe Perches5c3a0fd2013-09-21 10:22:42 -070072int ip6_route_init(void);
73void ip6_route_cleanup(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
Joe Perches5c3a0fd2013-09-21 10:22:42 -070075int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
Joe Perches5c3a0fd2013-09-21 10:22:42 -070077int ip6_route_add(struct fib6_config *cfg);
78int ip6_ins_rt(struct rt6_info *);
79int ip6_del_rt(struct rt6_info *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
Joe Perches5c3a0fd2013-09-21 10:22:42 -070081int ip6_route_get_saddr(struct net *net, struct rt6_info *rt,
82 const struct in6_addr *daddr, unsigned int prefs,
83 struct in6_addr *saddr);
Daniel Walterc3968a82011-04-13 21:10:57 +000084
Joe Perches5c3a0fd2013-09-21 10:22:42 -070085struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
86 const struct in6_addr *saddr, int oif, int flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
Joe Perches5c3a0fd2013-09-21 10:22:42 -070088struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6);
89int icmp6_dst_gc(void);
YOSHIFUJI Hideaki3b009442007-12-06 16:11:48 -080090
Joe Perches5c3a0fd2013-09-21 10:22:42 -070091void fib6_force_start_gc(struct net *net);
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
Joe Perches5c3a0fd2013-09-21 10:22:42 -070093struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
94 const struct in6_addr *addr, bool anycast);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
96/*
97 * support functions for ND
98 *
99 */
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700100struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr,
101 struct net_device *dev);
102struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
103 struct net_device *dev, unsigned int pref);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700105void rt6_purge_dflt_routers(struct net *net);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700107int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
108 const struct in6_addr *gwaddr);
YOSHIFUJI Hideaki70ceb4f2006-03-20 17:06:24 -0800109
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700110void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif,
111 u32 mark);
112void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu);
113void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark);
114void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
115 u32 mark);
116void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118struct netlink_callback;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000120struct rt6_rtnl_dump_arg {
Patrick McHardy1b43af52006-08-10 23:11:17 -0700121 struct sk_buff *skb;
122 struct netlink_callback *cb;
Brian Haley191cd582008-08-14 15:33:21 -0700123 struct net *net;
Patrick McHardy1b43af52006-08-10 23:11:17 -0700124};
125
Joe Perches5c3a0fd2013-09-21 10:22:42 -0700126int rt6_dump_route(struct rt6_info *rt, void *p_arg);
127void rt6_ifdown(struct net *net, struct net_device *dev);
128void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
129void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
Duan Jiongbe7a0102014-05-15 15:56:14 +0800130void rt6_clean_tohost(struct net *net, struct in6_addr *gateway);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
133/*
134 * Store a destination cache entry in a socket
135 */
Herbert Xu497c6152006-07-30 20:19:33 -0700136static inline void __ip6_dst_store(struct sock *sk, struct dst_entry *dst,
Eric Dumazetd3818c92012-07-17 21:38:04 +0000137 const struct in6_addr *daddr,
138 const struct in6_addr *saddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139{
140 struct ipv6_pinfo *np = inet6_sk(sk);
141 struct rt6_info *rt = (struct rt6_info *) dst;
142
Herbert Xuf83ef8c2006-06-30 13:37:03 -0700143 sk_setup_caps(sk, dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 np->daddr_cache = daddr;
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -0700145#ifdef CONFIG_IPV6_SUBTREES
146 np->saddr_cache = saddr;
147#endif
Martin KaFai Laub197df42015-05-22 20:56:01 -0700148 np->dst_cookie = rt6_get_cookie(rt);
Herbert Xu497c6152006-07-30 20:19:33 -0700149}
150
151static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -0700152 struct in6_addr *daddr, struct in6_addr *saddr)
Herbert Xu497c6152006-07-30 20:19:33 -0700153{
Eric Dumazetb6c67122010-04-08 23:03:29 +0000154 spin_lock(&sk->sk_dst_lock);
YOSHIFUJI Hideaki8e1ef0a2006-08-29 17:15:09 -0700155 __ip6_dst_store(sk, dst, daddr, saddr);
Eric Dumazetb6c67122010-04-08 23:03:29 +0000156 spin_unlock(&sk->sk_dst_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157}
158
Eric Dumazeta50feda2012-05-18 18:57:34 +0000159static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160{
Eric Dumazetadf30902009-06-02 05:19:30 +0000161 struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162
163 return rt->rt6i_flags & RTF_LOCAL;
164}
165
Martin KaFai Lau2647a9b2015-05-22 20:55:58 -0700166static inline bool ipv6_anycast_destination(const struct dst_entry *dst,
167 const struct in6_addr *daddr)
FX Le Bail509aba32014-01-07 14:57:27 +0100168{
Martin KaFai Lau2647a9b2015-05-22 20:55:58 -0700169 struct rt6_info *rt = (struct rt6_info *)dst;
FX Le Bail509aba32014-01-07 14:57:27 +0100170
Martin KaFai Lau2647a9b2015-05-22 20:55:58 -0700171 return rt->rt6i_flags & RTF_ANYCAST ||
172 (rt->rt6i_dst.plen != 128 &&
173 ipv6_addr_equal(&rt->rt6i_dst.addr, daddr));
FX Le Bail509aba32014-01-07 14:57:27 +0100174}
175
David Miller7026b1d2015-04-05 22:19:04 -0400176int ip6_fragment(struct sock *sk, struct sk_buff *skb,
177 int (*output)(struct sock *, struct sk_buff *));
David Stevensad0081e2010-12-17 11:42:42 +0000178
179static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
180{
hannes@stressinduktion.orgf60e5992015-04-01 17:07:44 +0200181 struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?
182 inet6_sk(skb->sk) : NULL;
David Stevensad0081e2010-12-17 11:42:42 +0000183
Hannes Frederic Sowa93b36cf2013-12-15 03:41:14 +0100184 return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ?
David Stevensad0081e2010-12-17 11:42:42 +0000185 skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
186}
187
Hannes Frederic Sowa93b36cf2013-12-15 03:41:14 +0100188static inline bool ip6_sk_accept_pmtu(const struct sock *sk)
189{
Hannes Frederic Sowa0b952272014-02-26 01:20:43 +0100190 return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE &&
191 inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT;
192}
193
WANG Cong60ff7462014-05-04 16:39:18 -0700194static inline bool ip6_sk_ignore_df(const struct sock *sk)
Hannes Frederic Sowa0b952272014-02-26 01:20:43 +0100195{
196 return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO ||
197 inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT;
Hannes Frederic Sowa93b36cf2013-12-15 03:41:14 +0100198}
199
Martin KaFai Lau2647a9b2015-05-22 20:55:58 -0700200static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt,
201 struct in6_addr *daddr)
YOSHIFUJI Hideaki / 吉藤英明9bb5a142013-01-17 12:53:48 +0000202{
Martin KaFai Lau2647a9b2015-05-22 20:55:58 -0700203 if (rt->rt6i_flags & RTF_GATEWAY)
204 return &rt->rt6i_gateway;
Martin KaFai Lau45e4fd22015-05-22 20:56:00 -0700205 else if (unlikely(rt->rt6i_flags & RTF_CACHE))
Martin KaFai Lau2647a9b2015-05-22 20:55:58 -0700206 return &rt->rt6i_dst.addr;
207 else
208 return daddr;
YOSHIFUJI Hideaki / 吉藤英明9bb5a142013-01-17 12:53:48 +0000209}
210
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211#endif