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