1 #ifndef _NET_IP6_ROUTE_H 2 #define _NET_IP6_ROUTE_H 3 4 #define IP6_RT_PRIO_USER 1024 5 #define IP6_RT_PRIO_ADDRCONF 256 6 7 struct route_info { 8 __u8 type; 9 __u8 length; 10 __u8 prefix_len; 11 #if defined(__BIG_ENDIAN_BITFIELD) 12 __u8 reserved_h:3, 13 route_pref:2, 14 reserved_l:3; 15 #elif defined(__LITTLE_ENDIAN_BITFIELD) 16 __u8 reserved_l:3, 17 route_pref:2, 18 reserved_h:3; 19 #endif 20 __be32 lifetime; 21 __u8 prefix[0]; /* 0,8 or 16 */ 22 }; 23 24 #ifdef __KERNEL__ 25 26 #include <net/flow.h> 27 #include <net/ip6_fib.h> 28 #include <net/sock.h> 29 #include <linux/ip.h> 30 #include <linux/ipv6.h> 31 32 #define RT6_LOOKUP_F_IFACE 0x00000001 33 #define RT6_LOOKUP_F_REACHABLE 0x00000002 34 #define RT6_LOOKUP_F_HAS_SADDR 0x00000004 35 #define RT6_LOOKUP_F_SRCPREF_TMP 0x00000008 36 #define RT6_LOOKUP_F_SRCPREF_PUBLIC 0x00000010 37 #define RT6_LOOKUP_F_SRCPREF_COA 0x00000020 38 39 /* 40 * rt6_srcprefs2flags() and rt6_flags2srcprefs() translate 41 * between IPV6_ADDR_PREFERENCES socket option values 42 * IPV6_PREFER_SRC_TMP = 0x1 43 * IPV6_PREFER_SRC_PUBLIC = 0x2 44 * IPV6_PREFER_SRC_COA = 0x4 45 * and above RT6_LOOKUP_F_SRCPREF_xxx flags. 46 */ 47 static inline int rt6_srcprefs2flags(unsigned int srcprefs) 48 { 49 /* No need to bitmask because srcprefs have only 3 bits. */ 50 return srcprefs << 3; 51 } 52 53 static inline unsigned int rt6_flags2srcprefs(int flags) 54 { 55 return (flags >> 3) & 7; 56 } 57 58 extern void rt6_bind_peer(struct rt6_info *rt, 59 int create); 60 61 static inline struct inet_peer *rt6_get_peer(struct rt6_info *rt) 62 { 63 if (rt->rt6i_peer) 64 return rt->rt6i_peer; 65 66 rt6_bind_peer(rt, 0); 67 return rt->rt6i_peer; 68 } 69 70 extern void ip6_route_input(struct sk_buff *skb); 71 72 extern struct dst_entry * ip6_route_output(struct net *net, 73 struct sock *sk, 74 struct flowi *fl); 75 76 extern int ip6_route_init(void); 77 extern void ip6_route_cleanup(void); 78 79 extern int ipv6_route_ioctl(struct net *net, 80 unsigned int cmd, 81 void __user *arg); 82 83 extern int ip6_route_add(struct fib6_config *cfg); 84 extern int ip6_ins_rt(struct rt6_info *); 85 extern int ip6_del_rt(struct rt6_info *); 86 87 extern struct rt6_info *rt6_lookup(struct net *net, 88 const struct in6_addr *daddr, 89 const struct in6_addr *saddr, 90 int oif, int flags); 91 92 extern struct dst_entry *icmp6_dst_alloc(struct net_device *dev, 93 struct neighbour *neigh, 94 const struct in6_addr *addr); 95 extern int icmp6_dst_gc(void); 96 97 extern void fib6_force_start_gc(struct net *net); 98 99 extern struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, 100 const struct in6_addr *addr, 101 int anycast); 102 103 extern int ip6_dst_hoplimit(struct dst_entry *dst); 104 105 /* 106 * support functions for ND 107 * 108 */ 109 extern struct rt6_info * rt6_get_dflt_router(struct in6_addr *addr, 110 struct net_device *dev); 111 extern struct rt6_info * rt6_add_dflt_router(struct in6_addr *gwaddr, 112 struct net_device *dev, 113 unsigned int pref); 114 115 extern void rt6_purge_dflt_routers(struct net *net); 116 117 extern int rt6_route_rcv(struct net_device *dev, 118 u8 *opt, int len, 119 struct in6_addr *gwaddr); 120 121 extern void rt6_redirect(struct in6_addr *dest, 122 struct in6_addr *src, 123 struct in6_addr *saddr, 124 struct neighbour *neigh, 125 u8 *lladdr, 126 int on_link); 127 128 extern void rt6_pmtu_discovery(struct in6_addr *daddr, 129 struct in6_addr *saddr, 130 struct net_device *dev, 131 u32 pmtu); 132 133 struct netlink_callback; 134 135 struct rt6_rtnl_dump_arg { 136 struct sk_buff *skb; 137 struct netlink_callback *cb; 138 struct net *net; 139 }; 140 141 extern int rt6_dump_route(struct rt6_info *rt, void *p_arg); 142 extern void rt6_ifdown(struct net *net, struct net_device *dev); 143 extern void rt6_mtu_change(struct net_device *dev, unsigned mtu); 144 145 146 /* 147 * Store a destination cache entry in a socket 148 */ 149 static inline void __ip6_dst_store(struct sock *sk, struct dst_entry *dst, 150 struct in6_addr *daddr, struct in6_addr *saddr) 151 { 152 struct ipv6_pinfo *np = inet6_sk(sk); 153 struct rt6_info *rt = (struct rt6_info *) dst; 154 155 sk_setup_caps(sk, dst); 156 np->daddr_cache = daddr; 157 #ifdef CONFIG_IPV6_SUBTREES 158 np->saddr_cache = saddr; 159 #endif 160 np->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; 161 } 162 163 static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst, 164 struct in6_addr *daddr, struct in6_addr *saddr) 165 { 166 spin_lock(&sk->sk_dst_lock); 167 __ip6_dst_store(sk, dst, daddr, saddr); 168 spin_unlock(&sk->sk_dst_lock); 169 } 170 171 static inline int ipv6_unicast_destination(struct sk_buff *skb) 172 { 173 struct rt6_info *rt = (struct rt6_info *) skb_dst(skb); 174 175 return rt->rt6i_flags & RTF_LOCAL; 176 } 177 178 int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)); 179 180 static inline int ip6_skb_dst_mtu(struct sk_buff *skb) 181 { 182 struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL; 183 184 return (np && np->pmtudisc == IPV6_PMTUDISC_PROBE) ? 185 skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb)); 186 } 187 188 #endif 189 #endif 190