Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _NET_IP6_ROUTE_H |
| 2 | #define _NET_IP6_ROUTE_H |
| 3 | |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame] | 4 | struct 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 Viro | e69a4adc | 2006-11-14 20:56:00 -0800 | [diff] [blame] | 17 | __be32 lifetime; |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame] | 18 | __u8 prefix[0]; /* 0,8 or 16 */ |
| 19 | }; |
| 20 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <net/flow.h> |
| 22 | #include <net/ip6_fib.h> |
| 23 | #include <net/sock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/ip.h> |
| 25 | #include <linux/ipv6.h> |
YOSHIFUJI Hideaki / 吉藤英明 | 9bb5a14 | 2013-01-17 12:53:48 +0000 | [diff] [blame] | 26 | #include <linux/route.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
YOSHIFUJI Hideaki | 7cbca67 | 2008-03-25 09:37:42 +0900 | [diff] [blame] | 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 |
YOSHIFUJI Hideaki | 77d16f4 | 2006-08-23 17:25:05 -0700 | [diff] [blame] | 34 | |
Eric Dumazet | 30f78d8 | 2014-04-10 21:23:36 -0700 | [diff] [blame] | 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 | |
YOSHIFUJI Hideaki / 吉藤英明 | 0c9a2ac | 2010-03-07 00:14:44 +0000 | [diff] [blame] | 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 | */ |
| 48 | static 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 | |
| 54 | static inline unsigned int rt6_flags2srcprefs(int flags) |
| 55 | { |
| 56 | return (flags >> 3) & 7; |
| 57 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | |
Wang Yufen | 60ea37f | 2014-03-29 09:27:30 +0800 | [diff] [blame] | 59 | static 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. Miller | fbfe95a | 2012-06-08 23:24:18 -0700 | [diff] [blame] | 64 | |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 65 | void ip6_route_input(struct sk_buff *skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | |
Paolo Abeni | 6f21c96 | 2016-01-29 12:30:19 +0100 | [diff] [blame] | 67 | struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk, |
| 68 | struct flowi6 *fl6, int flags); |
| 69 | |
| 70 | static 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 | |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 77 | struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
| 78 | int flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 80 | int ip6_route_init(void); |
| 81 | void ip6_route_cleanup(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 83 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 85 | int ip6_route_add(struct fib6_config *cfg); |
| 86 | int ip6_ins_rt(struct rt6_info *); |
| 87 | int ip6_del_rt(struct rt6_info *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 89 | int 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); |
Daniel Walter | c3968a8 | 2011-04-13 21:10:57 +0000 | [diff] [blame] | 92 | |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 93 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
| 94 | const struct in6_addr *saddr, int oif, int flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 96 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6); |
| 97 | int icmp6_dst_gc(void); |
YOSHIFUJI Hideaki | 3b00944 | 2007-12-06 16:11:48 -0800 | [diff] [blame] | 98 | |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 99 | void fib6_force_start_gc(struct net *net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 101 | struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, |
| 102 | const struct in6_addr *addr, bool anycast); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | |
| 104 | /* |
| 105 | * support functions for ND |
| 106 | * |
| 107 | */ |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 108 | struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, |
| 109 | struct net_device *dev); |
| 110 | struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, |
| 111 | struct net_device *dev, unsigned int pref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 113 | void rt6_purge_dflt_routers(struct net *net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 115 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, |
| 116 | const struct in6_addr *gwaddr); |
YOSHIFUJI Hideaki | 70ceb4f | 2006-03-20 17:06:24 -0800 | [diff] [blame] | 117 | |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 118 | void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif, |
| 119 | u32 mark); |
| 120 | void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu); |
| 121 | void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark); |
| 122 | void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif, |
| 123 | u32 mark); |
| 124 | void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | struct netlink_callback; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | |
Eric Dumazet | fd2c3ef | 2009-11-03 03:26:03 +0000 | [diff] [blame] | 128 | struct rt6_rtnl_dump_arg { |
Patrick McHardy | 1b43af5 | 2006-08-10 23:11:17 -0700 | [diff] [blame] | 129 | struct sk_buff *skb; |
| 130 | struct netlink_callback *cb; |
Brian Haley | 191cd58 | 2008-08-14 15:33:21 -0700 | [diff] [blame] | 131 | struct net *net; |
Patrick McHardy | 1b43af5 | 2006-08-10 23:11:17 -0700 | [diff] [blame] | 132 | }; |
| 133 | |
Joe Perches | 5c3a0fd | 2013-09-21 10:22:42 -0700 | [diff] [blame] | 134 | int rt6_dump_route(struct rt6_info *rt, void *p_arg); |
| 135 | void rt6_ifdown(struct net *net, struct net_device *dev); |
| 136 | void rt6_mtu_change(struct net_device *dev, unsigned int mtu); |
| 137 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp); |
Duan Jiong | be7a010 | 2014-05-15 15:56:14 +0800 | [diff] [blame] | 138 | void rt6_clean_tohost(struct net *net, struct in6_addr *gateway); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | |
| 141 | /* |
| 142 | * Store a destination cache entry in a socket |
| 143 | */ |
Eric Dumazet | 6bd4f35 | 2015-12-02 21:53:57 -0800 | [diff] [blame] | 144 | static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst, |
| 145 | const struct in6_addr *daddr, |
| 146 | const struct in6_addr *saddr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | { |
| 148 | struct ipv6_pinfo *np = inet6_sk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | |
Eric Dumazet | 6bd4f35 | 2015-12-02 21:53:57 -0800 | [diff] [blame] | 150 | np->dst_cookie = rt6_get_cookie((struct rt6_info *)dst); |
Herbert Xu | f83ef8c | 2006-06-30 13:37:03 -0700 | [diff] [blame] | 151 | sk_setup_caps(sk, dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | np->daddr_cache = daddr; |
YOSHIFUJI Hideaki | 8e1ef0a | 2006-08-29 17:15:09 -0700 | [diff] [blame] | 153 | #ifdef CONFIG_IPV6_SUBTREES |
| 154 | np->saddr_cache = saddr; |
| 155 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | } |
| 157 | |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 158 | static inline bool ipv6_unicast_destination(const struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | { |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 160 | struct rt6_info *rt = (struct rt6_info *) skb_dst(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | |
| 162 | return rt->rt6i_flags & RTF_LOCAL; |
| 163 | } |
| 164 | |
Martin KaFai Lau | 2647a9b | 2015-05-22 20:55:58 -0700 | [diff] [blame] | 165 | static inline bool ipv6_anycast_destination(const struct dst_entry *dst, |
| 166 | const struct in6_addr *daddr) |
FX Le Bail | 509aba3 | 2014-01-07 14:57:27 +0100 | [diff] [blame] | 167 | { |
Martin KaFai Lau | 2647a9b | 2015-05-22 20:55:58 -0700 | [diff] [blame] | 168 | struct rt6_info *rt = (struct rt6_info *)dst; |
FX Le Bail | 509aba3 | 2014-01-07 14:57:27 +0100 | [diff] [blame] | 169 | |
Martin KaFai Lau | 2647a9b | 2015-05-22 20:55:58 -0700 | [diff] [blame] | 170 | return rt->rt6i_flags & RTF_ANYCAST || |
| 171 | (rt->rt6i_dst.plen != 128 && |
| 172 | ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)); |
FX Le Bail | 509aba3 | 2014-01-07 14:57:27 +0100 | [diff] [blame] | 173 | } |
| 174 | |
Eric W. Biederman | 7d8c6e3 | 2015-06-12 22:12:04 -0500 | [diff] [blame] | 175 | int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, |
| 176 | int (*output)(struct net *, struct sock *, struct sk_buff *)); |
David Stevens | ad0081e | 2010-12-17 11:42:42 +0000 | [diff] [blame] | 177 | |
| 178 | static inline int ip6_skb_dst_mtu(struct sk_buff *skb) |
| 179 | { |
hannes@stressinduktion.org | f60e599 | 2015-04-01 17:07:44 +0200 | [diff] [blame] | 180 | struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ? |
| 181 | inet6_sk(skb->sk) : NULL; |
David Stevens | ad0081e | 2010-12-17 11:42:42 +0000 | [diff] [blame] | 182 | |
Hannes Frederic Sowa | 93b36cf | 2013-12-15 03:41:14 +0100 | [diff] [blame] | 183 | return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ? |
David Stevens | ad0081e | 2010-12-17 11:42:42 +0000 | [diff] [blame] | 184 | skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb)); |
| 185 | } |
| 186 | |
Hannes Frederic Sowa | 93b36cf | 2013-12-15 03:41:14 +0100 | [diff] [blame] | 187 | static inline bool ip6_sk_accept_pmtu(const struct sock *sk) |
| 188 | { |
Hannes Frederic Sowa | 0b95227 | 2014-02-26 01:20:43 +0100 | [diff] [blame] | 189 | return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE && |
| 190 | inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT; |
| 191 | } |
| 192 | |
WANG Cong | 60ff746 | 2014-05-04 16:39:18 -0700 | [diff] [blame] | 193 | static inline bool ip6_sk_ignore_df(const struct sock *sk) |
Hannes Frederic Sowa | 0b95227 | 2014-02-26 01:20:43 +0100 | [diff] [blame] | 194 | { |
| 195 | return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO || |
| 196 | inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT; |
Hannes Frederic Sowa | 93b36cf | 2013-12-15 03:41:14 +0100 | [diff] [blame] | 197 | } |
| 198 | |
Martin KaFai Lau | 2647a9b | 2015-05-22 20:55:58 -0700 | [diff] [blame] | 199 | static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt, |
| 200 | struct in6_addr *daddr) |
YOSHIFUJI Hideaki / 吉藤英明 | 9bb5a14 | 2013-01-17 12:53:48 +0000 | [diff] [blame] | 201 | { |
Martin KaFai Lau | 2647a9b | 2015-05-22 20:55:58 -0700 | [diff] [blame] | 202 | if (rt->rt6i_flags & RTF_GATEWAY) |
| 203 | return &rt->rt6i_gateway; |
Martin KaFai Lau | 45e4fd2 | 2015-05-22 20:56:00 -0700 | [diff] [blame] | 204 | else if (unlikely(rt->rt6i_flags & RTF_CACHE)) |
Martin KaFai Lau | 2647a9b | 2015-05-22 20:55:58 -0700 | [diff] [blame] | 205 | return &rt->rt6i_dst.addr; |
| 206 | else |
| 207 | return daddr; |
YOSHIFUJI Hideaki / 吉藤英明 | 9bb5a14 | 2013-01-17 12:53:48 +0000 | [diff] [blame] | 208 | } |
| 209 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | #endif |