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 68 struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk, 69 struct flowi6 *fl6, int flags); 70 71 static inline struct dst_entry *ip6_route_output(struct net *net, 72 const struct sock *sk, 73 struct flowi6 *fl6) 74 { 75 return ip6_route_output_flags(net, sk, fl6, 0); 76 } 77 78 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6, 79 int flags); 80 struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, 81 int ifindex, struct flowi6 *fl6, int flags); 82 83 int ip6_route_init(void); 84 void ip6_route_cleanup(void); 85 86 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg); 87 88 int ip6_route_add(struct fib6_config *cfg); 89 int ip6_ins_rt(struct rt6_info *); 90 int ip6_del_rt(struct rt6_info *); 91 92 static inline int ip6_route_get_saddr(struct net *net, struct rt6_info *rt, 93 const struct in6_addr *daddr, 94 unsigned int prefs, 95 struct in6_addr *saddr) 96 { 97 struct inet6_dev *idev = 98 rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL; 99 int err = 0; 100 101 if (rt && rt->rt6i_prefsrc.plen) 102 *saddr = rt->rt6i_prefsrc.addr; 103 else 104 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, 105 daddr, prefs, saddr); 106 107 return err; 108 } 109 110 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, 111 const struct in6_addr *saddr, int oif, int flags); 112 113 struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6); 114 int icmp6_dst_gc(void); 115 116 void fib6_force_start_gc(struct net *net); 117 118 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, 119 const struct in6_addr *addr, bool anycast); 120 121 struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev, 122 int flags); 123 124 /* 125 * support functions for ND 126 * 127 */ 128 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, 129 struct net_device *dev); 130 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, 131 struct net_device *dev, unsigned int pref); 132 133 void rt6_purge_dflt_routers(struct net *net); 134 135 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, 136 const struct in6_addr *gwaddr); 137 138 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif, 139 u32 mark); 140 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu); 141 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark); 142 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif, 143 u32 mark); 144 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk); 145 146 struct netlink_callback; 147 148 struct rt6_rtnl_dump_arg { 149 struct sk_buff *skb; 150 struct netlink_callback *cb; 151 struct net *net; 152 }; 153 154 int rt6_dump_route(struct rt6_info *rt, void *p_arg); 155 void rt6_ifdown(struct net *net, struct net_device *dev); 156 void rt6_mtu_change(struct net_device *dev, unsigned int mtu); 157 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp); 158 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway); 159 160 161 /* 162 * Store a destination cache entry in a socket 163 */ 164 static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst, 165 const struct in6_addr *daddr, 166 const struct in6_addr *saddr) 167 { 168 struct ipv6_pinfo *np = inet6_sk(sk); 169 170 np->dst_cookie = rt6_get_cookie((struct rt6_info *)dst); 171 sk_setup_caps(sk, dst); 172 np->daddr_cache = daddr; 173 #ifdef CONFIG_IPV6_SUBTREES 174 np->saddr_cache = saddr; 175 #endif 176 } 177 178 static inline bool ipv6_unicast_destination(const struct sk_buff *skb) 179 { 180 struct rt6_info *rt = (struct rt6_info *) skb_dst(skb); 181 182 return rt->rt6i_flags & RTF_LOCAL; 183 } 184 185 static inline bool ipv6_anycast_destination(const struct dst_entry *dst, 186 const struct in6_addr *daddr) 187 { 188 struct rt6_info *rt = (struct rt6_info *)dst; 189 190 return rt->rt6i_flags & RTF_ANYCAST || 191 (rt->rt6i_dst.plen != 128 && 192 ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)); 193 } 194 195 int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, 196 int (*output)(struct net *, struct sock *, struct sk_buff *)); 197 198 static inline int ip6_skb_dst_mtu(struct sk_buff *skb) 199 { 200 struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ? 201 inet6_sk(skb->sk) : NULL; 202 203 return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ? 204 skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb)); 205 } 206 207 static inline bool ip6_sk_accept_pmtu(const struct sock *sk) 208 { 209 return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE && 210 inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT; 211 } 212 213 static inline bool ip6_sk_ignore_df(const struct sock *sk) 214 { 215 return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO || 216 inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT; 217 } 218 219 static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt, 220 struct in6_addr *daddr) 221 { 222 if (rt->rt6i_flags & RTF_GATEWAY) 223 return &rt->rt6i_gateway; 224 else if (unlikely(rt->rt6i_flags & RTF_CACHE)) 225 return &rt->rt6i_dst.addr; 226 else 227 return daddr; 228 } 229 230 #endif 231