1 #ifndef _NET_IP6_ROUTE_H 2 #define _NET_IP6_ROUTE_H 3 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 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 /* 36 * rt6_srcprefs2flags() and rt6_flags2srcprefs() translate 37 * between IPV6_ADDR_PREFERENCES socket option values 38 * IPV6_PREFER_SRC_TMP = 0x1 39 * IPV6_PREFER_SRC_PUBLIC = 0x2 40 * IPV6_PREFER_SRC_COA = 0x4 41 * and above RT6_LOOKUP_F_SRCPREF_xxx flags. 42 */ 43 static inline int rt6_srcprefs2flags(unsigned int srcprefs) 44 { 45 /* No need to bitmask because srcprefs have only 3 bits. */ 46 return srcprefs << 3; 47 } 48 49 static inline unsigned int rt6_flags2srcprefs(int flags) 50 { 51 return (flags >> 3) & 7; 52 } 53 54 extern void rt6_bind_peer(struct rt6_info *rt, int create); 55 56 static inline struct inet_peer *__rt6_get_peer(struct rt6_info *rt, int create) 57 { 58 if (rt6_has_peer(rt)) 59 return rt6_peer_ptr(rt); 60 61 rt6_bind_peer(rt, create); 62 return (rt6_has_peer(rt) ? rt6_peer_ptr(rt) : NULL); 63 } 64 65 static inline struct inet_peer *rt6_get_peer(struct rt6_info *rt) 66 { 67 return __rt6_get_peer(rt, 0); 68 } 69 70 static inline struct inet_peer *rt6_get_peer_create(struct rt6_info *rt) 71 { 72 return __rt6_get_peer(rt, 1); 73 } 74 75 extern void ip6_route_input(struct sk_buff *skb); 76 77 extern struct dst_entry * ip6_route_output(struct net *net, 78 const struct sock *sk, 79 struct flowi6 *fl6); 80 extern struct dst_entry * ip6_route_lookup(struct net *net, 81 struct flowi6 *fl6, int flags); 82 83 extern int ip6_route_init(void); 84 extern void ip6_route_cleanup(void); 85 86 extern int ipv6_route_ioctl(struct net *net, 87 unsigned int cmd, 88 void __user *arg); 89 90 extern int ip6_route_add(struct fib6_config *cfg); 91 extern int ip6_ins_rt(struct rt6_info *); 92 extern int ip6_del_rt(struct rt6_info *); 93 94 extern int ip6_route_get_saddr(struct net *net, 95 struct rt6_info *rt, 96 const struct in6_addr *daddr, 97 unsigned int prefs, 98 struct in6_addr *saddr); 99 100 extern struct rt6_info *rt6_lookup(struct net *net, 101 const struct in6_addr *daddr, 102 const struct in6_addr *saddr, 103 int oif, int flags); 104 105 extern struct dst_entry *icmp6_dst_alloc(struct net_device *dev, 106 struct flowi6 *fl6); 107 extern int icmp6_dst_gc(void); 108 109 extern void fib6_force_start_gc(struct net *net); 110 111 extern struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, 112 const struct in6_addr *addr, 113 bool anycast); 114 115 extern int ip6_dst_hoplimit(struct dst_entry *dst); 116 117 /* 118 * support functions for ND 119 * 120 */ 121 extern struct rt6_info * rt6_get_dflt_router(const struct in6_addr *addr, 122 struct net_device *dev); 123 extern struct rt6_info * rt6_add_dflt_router(const struct in6_addr *gwaddr, 124 struct net_device *dev, 125 unsigned int pref); 126 127 extern void rt6_purge_dflt_routers(struct net *net); 128 129 extern int rt6_route_rcv(struct net_device *dev, 130 u8 *opt, int len, 131 const struct in6_addr *gwaddr); 132 133 extern void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, 134 int oif, u32 mark); 135 extern void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, 136 __be32 mtu); 137 extern void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark); 138 extern void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk); 139 140 struct netlink_callback; 141 142 struct rt6_rtnl_dump_arg { 143 struct sk_buff *skb; 144 struct netlink_callback *cb; 145 struct net *net; 146 }; 147 148 extern int rt6_dump_route(struct rt6_info *rt, void *p_arg); 149 extern void rt6_ifdown(struct net *net, struct net_device *dev); 150 extern void rt6_mtu_change(struct net_device *dev, unsigned int mtu); 151 extern void rt6_remove_prefsrc(struct inet6_ifaddr *ifp); 152 153 154 /* 155 * Store a destination cache entry in a socket 156 */ 157 static inline void __ip6_dst_store(struct sock *sk, struct dst_entry *dst, 158 const struct in6_addr *daddr, 159 const struct in6_addr *saddr) 160 { 161 struct ipv6_pinfo *np = inet6_sk(sk); 162 struct rt6_info *rt = (struct rt6_info *) dst; 163 164 sk_setup_caps(sk, dst); 165 np->daddr_cache = daddr; 166 #ifdef CONFIG_IPV6_SUBTREES 167 np->saddr_cache = saddr; 168 #endif 169 np->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; 170 } 171 172 static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst, 173 struct in6_addr *daddr, struct in6_addr *saddr) 174 { 175 spin_lock(&sk->sk_dst_lock); 176 __ip6_dst_store(sk, dst, daddr, saddr); 177 spin_unlock(&sk->sk_dst_lock); 178 } 179 180 static inline bool ipv6_unicast_destination(const struct sk_buff *skb) 181 { 182 struct rt6_info *rt = (struct rt6_info *) skb_dst(skb); 183 184 return rt->rt6i_flags & RTF_LOCAL; 185 } 186 187 int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)); 188 189 static inline int ip6_skb_dst_mtu(struct sk_buff *skb) 190 { 191 struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL; 192 193 return (np && np->pmtudisc == IPV6_PMTUDISC_PROBE) ? 194 skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb)); 195 } 196 197 static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt, struct in6_addr *dest) 198 { 199 if (rt->rt6i_flags & RTF_GATEWAY) 200 return &rt->rt6i_gateway; 201 return dest; 202 } 203 204 #endif 205