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 #include <net/flow.h> 25 #include <net/ip6_fib.h> 26 #include <net/sock.h> 27 #include <linux/ip.h> 28 #include <linux/ipv6.h> 29 30 #define RT6_LOOKUP_F_IFACE 0x00000001 31 #define RT6_LOOKUP_F_REACHABLE 0x00000002 32 #define RT6_LOOKUP_F_HAS_SADDR 0x00000004 33 #define RT6_LOOKUP_F_SRCPREF_TMP 0x00000008 34 #define RT6_LOOKUP_F_SRCPREF_PUBLIC 0x00000010 35 #define RT6_LOOKUP_F_SRCPREF_COA 0x00000020 36 37 /* 38 * rt6_srcprefs2flags() and rt6_flags2srcprefs() translate 39 * between IPV6_ADDR_PREFERENCES socket option values 40 * IPV6_PREFER_SRC_TMP = 0x1 41 * IPV6_PREFER_SRC_PUBLIC = 0x2 42 * IPV6_PREFER_SRC_COA = 0x4 43 * and above RT6_LOOKUP_F_SRCPREF_xxx flags. 44 */ 45 static inline int rt6_srcprefs2flags(unsigned int srcprefs) 46 { 47 /* No need to bitmask because srcprefs have only 3 bits. */ 48 return srcprefs << 3; 49 } 50 51 static inline unsigned int rt6_flags2srcprefs(int flags) 52 { 53 return (flags >> 3) & 7; 54 } 55 56 extern void rt6_bind_peer(struct rt6_info *rt, 57 int create); 58 59 static inline struct inet_peer *rt6_get_peer(struct rt6_info *rt) 60 { 61 if (rt->rt6i_peer) 62 return rt->rt6i_peer; 63 64 rt6_bind_peer(rt, 0); 65 return rt->rt6i_peer; 66 } 67 68 extern void ip6_route_input(struct sk_buff *skb); 69 70 extern struct dst_entry * ip6_route_output(struct net *net, 71 const struct sock *sk, 72 struct flowi6 *fl6); 73 74 extern int ip6_route_init(void); 75 extern void ip6_route_cleanup(void); 76 77 extern int ipv6_route_ioctl(struct net *net, 78 unsigned int cmd, 79 void __user *arg); 80 81 extern int ip6_route_add(struct fib6_config *cfg); 82 extern int ip6_ins_rt(struct rt6_info *); 83 extern int ip6_del_rt(struct rt6_info *); 84 85 extern int ip6_route_get_saddr(struct net *net, 86 struct rt6_info *rt, 87 const struct in6_addr *daddr, 88 unsigned int prefs, 89 struct in6_addr *saddr); 90 91 extern struct rt6_info *rt6_lookup(struct net *net, 92 const struct in6_addr *daddr, 93 const struct in6_addr *saddr, 94 int oif, int flags); 95 96 extern struct dst_entry *icmp6_dst_alloc(struct net_device *dev, 97 struct neighbour *neigh, 98 struct flowi6 *fl6); 99 extern int icmp6_dst_gc(void); 100 101 extern void fib6_force_start_gc(struct net *net); 102 103 extern struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, 104 const struct in6_addr *addr, 105 bool anycast); 106 107 extern int ip6_dst_hoplimit(struct dst_entry *dst); 108 109 /* 110 * support functions for ND 111 * 112 */ 113 extern struct rt6_info * rt6_get_dflt_router(const struct in6_addr *addr, 114 struct net_device *dev); 115 extern struct rt6_info * rt6_add_dflt_router(const struct in6_addr *gwaddr, 116 struct net_device *dev, 117 unsigned int pref); 118 119 extern void rt6_purge_dflt_routers(struct net *net); 120 121 extern int rt6_route_rcv(struct net_device *dev, 122 u8 *opt, int len, 123 const struct in6_addr *gwaddr); 124 125 extern void rt6_redirect(const struct in6_addr *dest, 126 const struct in6_addr *src, 127 const struct in6_addr *saddr, 128 struct neighbour *neigh, 129 u8 *lladdr, 130 int on_link); 131 132 extern void rt6_pmtu_discovery(const struct in6_addr *daddr, 133 const struct in6_addr *saddr, 134 struct net_device *dev, 135 u32 pmtu); 136 137 struct netlink_callback; 138 139 struct rt6_rtnl_dump_arg { 140 struct sk_buff *skb; 141 struct netlink_callback *cb; 142 struct net *net; 143 }; 144 145 extern int rt6_dump_route(struct rt6_info *rt, void *p_arg); 146 extern void rt6_ifdown(struct net *net, struct net_device *dev); 147 extern void rt6_mtu_change(struct net_device *dev, unsigned mtu); 148 extern void rt6_remove_prefsrc(struct inet6_ifaddr *ifp); 149 150 151 /* 152 * Store a destination cache entry in a socket 153 */ 154 static inline void __ip6_dst_store(struct sock *sk, struct dst_entry *dst, 155 struct in6_addr *daddr, struct in6_addr *saddr) 156 { 157 struct ipv6_pinfo *np = inet6_sk(sk); 158 struct rt6_info *rt = (struct rt6_info *) dst; 159 160 sk_setup_caps(sk, dst); 161 np->daddr_cache = daddr; 162 #ifdef CONFIG_IPV6_SUBTREES 163 np->saddr_cache = saddr; 164 #endif 165 np->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; 166 } 167 168 static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst, 169 struct in6_addr *daddr, struct in6_addr *saddr) 170 { 171 spin_lock(&sk->sk_dst_lock); 172 __ip6_dst_store(sk, dst, daddr, saddr); 173 spin_unlock(&sk->sk_dst_lock); 174 } 175 176 static inline int ipv6_unicast_destination(struct sk_buff *skb) 177 { 178 struct rt6_info *rt = (struct rt6_info *) skb_dst(skb); 179 180 return rt->rt6i_flags & RTF_LOCAL; 181 } 182 183 int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)); 184 185 static inline int ip6_skb_dst_mtu(struct sk_buff *skb) 186 { 187 struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL; 188 189 return (np && np->pmtudisc == IPV6_PMTUDISC_PROBE) ? 190 skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb)); 191 } 192 193 #endif 194