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/addrconf.h> 22 #include <net/flow.h> 23 #include <net/ip6_fib.h> 24 #include <net/sock.h> 25 #include <linux/ip.h> 26 #include <linux/ipv6.h> 27 #include <linux/route.h> 28 29 #define RT6_LOOKUP_F_IFACE 0x00000001 30 #define RT6_LOOKUP_F_REACHABLE 0x00000002 31 #define RT6_LOOKUP_F_HAS_SADDR 0x00000004 32 #define RT6_LOOKUP_F_SRCPREF_TMP 0x00000008 33 #define RT6_LOOKUP_F_SRCPREF_PUBLIC 0x00000010 34 #define RT6_LOOKUP_F_SRCPREF_COA 0x00000020 35 #define RT6_LOOKUP_F_IGNORE_LINKSTATE 0x00000040 36 37 /* We do not (yet ?) support IPv6 jumbograms (RFC 2675) 38 * Unlike IPv4, hdr->seg_len doesn't include the IPv6 header 39 */ 40 #define IP6_MAX_MTU (0xFFFF + sizeof(struct ipv6hdr)) 41 42 /* 43 * rt6_srcprefs2flags() and rt6_flags2srcprefs() translate 44 * between IPV6_ADDR_PREFERENCES socket option values 45 * IPV6_PREFER_SRC_TMP = 0x1 46 * IPV6_PREFER_SRC_PUBLIC = 0x2 47 * IPV6_PREFER_SRC_COA = 0x4 48 * and above RT6_LOOKUP_F_SRCPREF_xxx flags. 49 */ 50 static inline int rt6_srcprefs2flags(unsigned int srcprefs) 51 { 52 /* No need to bitmask because srcprefs have only 3 bits. */ 53 return srcprefs << 3; 54 } 55 56 static inline unsigned int rt6_flags2srcprefs(int flags) 57 { 58 return (flags >> 3) & 7; 59 } 60 61 static inline bool rt6_need_strict(const struct in6_addr *daddr) 62 { 63 return ipv6_addr_type(daddr) & 64 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 65 } 66 67 void ip6_route_input(struct sk_buff *skb); 68 struct dst_entry *ip6_route_input_lookup(struct net *net, 69 struct net_device *dev, 70 struct flowi6 *fl6, int flags); 71 72 struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk, 73 struct flowi6 *fl6, int flags); 74 75 static inline struct dst_entry *ip6_route_output(struct net *net, 76 const struct sock *sk, 77 struct flowi6 *fl6) 78 { 79 return ip6_route_output_flags(net, sk, fl6, 0); 80 } 81 82 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6, 83 int flags); 84 struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, 85 int ifindex, struct flowi6 *fl6, int flags); 86 87 int ip6_route_init(void); 88 void ip6_route_cleanup(void); 89 90 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg); 91 92 int ip6_route_add(struct fib6_config *cfg); 93 int ip6_ins_rt(struct rt6_info *); 94 int ip6_del_rt(struct rt6_info *); 95 96 static inline int ip6_route_get_saddr(struct net *net, struct rt6_info *rt, 97 const struct in6_addr *daddr, 98 unsigned int prefs, 99 struct in6_addr *saddr) 100 { 101 struct inet6_dev *idev = 102 rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL; 103 int err = 0; 104 105 if (rt && rt->rt6i_prefsrc.plen) 106 *saddr = rt->rt6i_prefsrc.addr; 107 else 108 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, 109 daddr, prefs, saddr); 110 111 return err; 112 } 113 114 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, 115 const struct in6_addr *saddr, int oif, int flags); 116 117 struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6); 118 int icmp6_dst_gc(void); 119 120 void fib6_force_start_gc(struct net *net); 121 122 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, 123 const struct in6_addr *addr, bool anycast); 124 125 struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev, 126 int flags); 127 128 /* 129 * support functions for ND 130 * 131 */ 132 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, 133 struct net_device *dev); 134 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, 135 struct net_device *dev, unsigned int pref); 136 137 void rt6_purge_dflt_routers(struct net *net); 138 139 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, 140 const struct in6_addr *gwaddr); 141 142 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif, 143 u32 mark); 144 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu); 145 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark); 146 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif, 147 u32 mark); 148 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk); 149 150 struct netlink_callback; 151 152 struct rt6_rtnl_dump_arg { 153 struct sk_buff *skb; 154 struct netlink_callback *cb; 155 struct net *net; 156 }; 157 158 int rt6_dump_route(struct rt6_info *rt, void *p_arg); 159 void rt6_ifdown(struct net *net, struct net_device *dev); 160 void rt6_mtu_change(struct net_device *dev, unsigned int mtu); 161 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp); 162 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway); 163 164 165 /* 166 * Store a destination cache entry in a socket 167 */ 168 static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst, 169 const struct in6_addr *daddr, 170 const struct in6_addr *saddr) 171 { 172 struct ipv6_pinfo *np = inet6_sk(sk); 173 174 np->dst_cookie = rt6_get_cookie((struct rt6_info *)dst); 175 sk_setup_caps(sk, dst); 176 np->daddr_cache = daddr; 177 #ifdef CONFIG_IPV6_SUBTREES 178 np->saddr_cache = saddr; 179 #endif 180 } 181 182 static inline bool ipv6_unicast_destination(const struct sk_buff *skb) 183 { 184 struct rt6_info *rt = (struct rt6_info *) skb_dst(skb); 185 186 return rt->rt6i_flags & RTF_LOCAL; 187 } 188 189 static inline bool ipv6_anycast_destination(const struct dst_entry *dst, 190 const struct in6_addr *daddr) 191 { 192 struct rt6_info *rt = (struct rt6_info *)dst; 193 194 return rt->rt6i_flags & RTF_ANYCAST || 195 (rt->rt6i_dst.plen != 128 && 196 ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)); 197 } 198 199 int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, 200 int (*output)(struct net *, struct sock *, struct sk_buff *)); 201 202 static inline int ip6_skb_dst_mtu(struct sk_buff *skb) 203 { 204 struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ? 205 inet6_sk(skb->sk) : NULL; 206 207 return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ? 208 skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb)); 209 } 210 211 static inline bool ip6_sk_accept_pmtu(const struct sock *sk) 212 { 213 return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE && 214 inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT; 215 } 216 217 static inline bool ip6_sk_ignore_df(const struct sock *sk) 218 { 219 return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO || 220 inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT; 221 } 222 223 static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt, 224 struct in6_addr *daddr) 225 { 226 if (rt->rt6i_flags & RTF_GATEWAY) 227 return &rt->rt6i_gateway; 228 else if (unlikely(rt->rt6i_flags & RTF_CACHE)) 229 return &rt->rt6i_dst.addr; 230 else 231 return daddr; 232 } 233 234 #endif 235