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, int create); 57 58 static inline struct inet_peer *__rt6_get_peer(struct rt6_info *rt, int create) 59 { 60 if (rt6_has_peer(rt)) 61 return rt6_peer_ptr(rt); 62 63 rt6_bind_peer(rt, create); 64 return (rt6_has_peer(rt) ? rt6_peer_ptr(rt) : NULL); 65 } 66 67 static inline struct inet_peer *rt6_get_peer(struct rt6_info *rt) 68 { 69 return __rt6_get_peer(rt, 0); 70 } 71 72 static inline struct inet_peer *rt6_get_peer_create(struct rt6_info *rt) 73 { 74 return __rt6_get_peer(rt, 1); 75 } 76 77 extern void ip6_route_input(struct sk_buff *skb); 78 79 extern struct dst_entry * ip6_route_output(struct net *net, 80 const struct sock *sk, 81 struct flowi6 *fl6); 82 extern struct dst_entry * ip6_route_lookup(struct net *net, 83 struct flowi6 *fl6, int flags); 84 85 extern int ip6_route_init(void); 86 extern void ip6_route_cleanup(void); 87 88 extern int ipv6_route_ioctl(struct net *net, 89 unsigned int cmd, 90 void __user *arg); 91 92 extern int ip6_route_add(struct fib6_config *cfg); 93 extern int ip6_ins_rt(struct rt6_info *); 94 extern int ip6_del_rt(struct rt6_info *); 95 96 extern int ip6_route_get_saddr(struct net *net, 97 struct rt6_info *rt, 98 const struct in6_addr *daddr, 99 unsigned int prefs, 100 struct in6_addr *saddr); 101 102 extern struct rt6_info *rt6_lookup(struct net *net, 103 const struct in6_addr *daddr, 104 const struct in6_addr *saddr, 105 int oif, int flags); 106 107 extern struct dst_entry *icmp6_dst_alloc(struct net_device *dev, 108 struct neighbour *neigh, 109 struct flowi6 *fl6); 110 extern int icmp6_dst_gc(void); 111 112 extern void fib6_force_start_gc(struct net *net); 113 114 extern struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, 115 const struct in6_addr *addr, 116 bool anycast); 117 118 extern int ip6_dst_hoplimit(struct dst_entry *dst); 119 120 /* 121 * support functions for ND 122 * 123 */ 124 extern struct rt6_info * rt6_get_dflt_router(const struct in6_addr *addr, 125 struct net_device *dev); 126 extern struct rt6_info * rt6_add_dflt_router(const struct in6_addr *gwaddr, 127 struct net_device *dev, 128 unsigned int pref); 129 130 extern void rt6_purge_dflt_routers(struct net *net); 131 132 extern int rt6_route_rcv(struct net_device *dev, 133 u8 *opt, int len, 134 const struct in6_addr *gwaddr); 135 136 extern void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, 137 int oif, u32 mark); 138 extern void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, 139 __be32 mtu); 140 extern void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark); 141 extern void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk); 142 143 struct netlink_callback; 144 145 struct rt6_rtnl_dump_arg { 146 struct sk_buff *skb; 147 struct netlink_callback *cb; 148 struct net *net; 149 }; 150 151 extern int rt6_dump_route(struct rt6_info *rt, void *p_arg); 152 extern void rt6_ifdown(struct net *net, struct net_device *dev); 153 extern void rt6_mtu_change(struct net_device *dev, unsigned int mtu); 154 extern void rt6_remove_prefsrc(struct inet6_ifaddr *ifp); 155 156 157 /* 158 * Store a destination cache entry in a socket 159 */ 160 static inline void __ip6_dst_store(struct sock *sk, struct dst_entry *dst, 161 const struct in6_addr *daddr, 162 const struct in6_addr *saddr) 163 { 164 struct ipv6_pinfo *np = inet6_sk(sk); 165 struct rt6_info *rt = (struct rt6_info *) dst; 166 167 sk_setup_caps(sk, dst); 168 np->daddr_cache = daddr; 169 #ifdef CONFIG_IPV6_SUBTREES 170 np->saddr_cache = saddr; 171 #endif 172 np->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; 173 } 174 175 static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst, 176 struct in6_addr *daddr, struct in6_addr *saddr) 177 { 178 spin_lock(&sk->sk_dst_lock); 179 __ip6_dst_store(sk, dst, daddr, saddr); 180 spin_unlock(&sk->sk_dst_lock); 181 } 182 183 static inline bool ipv6_unicast_destination(const struct sk_buff *skb) 184 { 185 struct rt6_info *rt = (struct rt6_info *) skb_dst(skb); 186 187 return rt->rt6i_flags & RTF_LOCAL; 188 } 189 190 int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)); 191 192 static inline int ip6_skb_dst_mtu(struct sk_buff *skb) 193 { 194 struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL; 195 196 return (np && np->pmtudisc == IPV6_PMTUDISC_PROBE) ? 197 skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb)); 198 } 199 200 #endif 201