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 static inline bool rt6_need_strict(const struct in6_addr *daddr) 55 { 56 return ipv6_addr_type(daddr) & 57 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 58 } 59 60 void ip6_route_input(struct sk_buff *skb); 61 62 struct dst_entry *ip6_route_output(struct net *net, const struct sock *sk, 63 struct flowi6 *fl6); 64 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6, 65 int flags); 66 67 int ip6_route_init(void); 68 void ip6_route_cleanup(void); 69 70 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg); 71 72 int ip6_route_add(struct fib6_config *cfg); 73 int ip6_ins_rt(struct rt6_info *); 74 int ip6_del_rt(struct rt6_info *); 75 76 int ip6_route_get_saddr(struct net *net, struct rt6_info *rt, 77 const struct in6_addr *daddr, unsigned int prefs, 78 struct in6_addr *saddr); 79 80 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, 81 const struct in6_addr *saddr, int oif, int flags); 82 83 struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6); 84 int icmp6_dst_gc(void); 85 86 void fib6_force_start_gc(struct net *net); 87 88 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, 89 const struct in6_addr *addr, bool anycast); 90 91 /* 92 * support functions for ND 93 * 94 */ 95 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, 96 struct net_device *dev); 97 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, 98 struct net_device *dev, unsigned int pref); 99 100 void rt6_purge_dflt_routers(struct net *net); 101 102 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, 103 const struct in6_addr *gwaddr); 104 105 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif, 106 u32 mark); 107 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu); 108 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark); 109 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif, 110 u32 mark); 111 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk); 112 113 struct netlink_callback; 114 115 struct rt6_rtnl_dump_arg { 116 struct sk_buff *skb; 117 struct netlink_callback *cb; 118 struct net *net; 119 }; 120 121 int rt6_dump_route(struct rt6_info *rt, void *p_arg); 122 void rt6_ifdown(struct net *net, struct net_device *dev); 123 void rt6_mtu_change(struct net_device *dev, unsigned int mtu); 124 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp); 125 126 127 /* 128 * Store a destination cache entry in a socket 129 */ 130 static inline void __ip6_dst_store(struct sock *sk, struct dst_entry *dst, 131 const struct in6_addr *daddr, 132 const struct in6_addr *saddr) 133 { 134 struct ipv6_pinfo *np = inet6_sk(sk); 135 struct rt6_info *rt = (struct rt6_info *) dst; 136 137 sk_setup_caps(sk, dst); 138 np->daddr_cache = daddr; 139 #ifdef CONFIG_IPV6_SUBTREES 140 np->saddr_cache = saddr; 141 #endif 142 np->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; 143 } 144 145 static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst, 146 struct in6_addr *daddr, struct in6_addr *saddr) 147 { 148 spin_lock(&sk->sk_dst_lock); 149 __ip6_dst_store(sk, dst, daddr, saddr); 150 spin_unlock(&sk->sk_dst_lock); 151 } 152 153 static inline bool ipv6_unicast_destination(const struct sk_buff *skb) 154 { 155 struct rt6_info *rt = (struct rt6_info *) skb_dst(skb); 156 157 return rt->rt6i_flags & RTF_LOCAL; 158 } 159 160 static inline bool ipv6_anycast_destination(const struct sk_buff *skb) 161 { 162 struct rt6_info *rt = (struct rt6_info *) skb_dst(skb); 163 164 return rt->rt6i_flags & RTF_ANYCAST; 165 } 166 167 int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)); 168 169 static inline int ip6_skb_dst_mtu(struct sk_buff *skb) 170 { 171 struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL; 172 173 return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ? 174 skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb)); 175 } 176 177 static inline bool ip6_sk_accept_pmtu(const struct sock *sk) 178 { 179 return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE && 180 inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT; 181 } 182 183 static inline bool ip6_sk_local_df(const struct sock *sk) 184 { 185 return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO || 186 inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT; 187 } 188 189 static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt) 190 { 191 return &rt->rt6i_gateway; 192 } 193 194 #endif 195