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 <net/lwtunnel.h> 26 #include <linux/ip.h> 27 #include <linux/ipv6.h> 28 #include <linux/route.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 #define RT6_LOOKUP_F_IGNORE_LINKSTATE 0x00000040 37 38 /* We do not (yet ?) support IPv6 jumbograms (RFC 2675) 39 * Unlike IPv4, hdr->seg_len doesn't include the IPv6 header 40 */ 41 #define IP6_MAX_MTU (0xFFFF + sizeof(struct ipv6hdr)) 42 43 /* 44 * rt6_srcprefs2flags() and rt6_flags2srcprefs() translate 45 * between IPV6_ADDR_PREFERENCES socket option values 46 * IPV6_PREFER_SRC_TMP = 0x1 47 * IPV6_PREFER_SRC_PUBLIC = 0x2 48 * IPV6_PREFER_SRC_COA = 0x4 49 * and above RT6_LOOKUP_F_SRCPREF_xxx flags. 50 */ 51 static inline int rt6_srcprefs2flags(unsigned int srcprefs) 52 { 53 /* No need to bitmask because srcprefs have only 3 bits. */ 54 return srcprefs << 3; 55 } 56 57 static inline unsigned int rt6_flags2srcprefs(int flags) 58 { 59 return (flags >> 3) & 7; 60 } 61 62 static inline bool rt6_need_strict(const struct in6_addr *daddr) 63 { 64 return ipv6_addr_type(daddr) & 65 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 66 } 67 68 void ip6_route_input(struct sk_buff *skb); 69 struct dst_entry *ip6_route_input_lookup(struct net *net, 70 struct net_device *dev, 71 struct flowi6 *fl6, int flags); 72 73 struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk, 74 struct flowi6 *fl6, int flags); 75 76 static inline struct dst_entry *ip6_route_output(struct net *net, 77 const struct sock *sk, 78 struct flowi6 *fl6) 79 { 80 return ip6_route_output_flags(net, sk, fl6, 0); 81 } 82 83 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6, 84 int flags); 85 struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, 86 int ifindex, struct flowi6 *fl6, int flags); 87 88 void ip6_route_init_special_entries(void); 89 int ip6_route_init(void); 90 void ip6_route_cleanup(void); 91 92 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg); 93 94 int ip6_route_add(struct fib6_config *cfg, struct netlink_ext_ack *extack); 95 int ip6_ins_rt(struct rt6_info *); 96 int ip6_del_rt(struct rt6_info *); 97 98 void rt6_flush_exceptions(struct rt6_info *rt); 99 int rt6_remove_exception_rt(struct rt6_info *rt); 100 void rt6_age_exceptions(struct rt6_info *rt, struct fib6_gc_args *gc_args, 101 unsigned long now); 102 103 static inline int ip6_route_get_saddr(struct net *net, struct rt6_info *rt, 104 const struct in6_addr *daddr, 105 unsigned int prefs, 106 struct in6_addr *saddr) 107 { 108 struct inet6_dev *idev = 109 rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL; 110 int err = 0; 111 112 if (rt && rt->rt6i_prefsrc.plen) 113 *saddr = rt->rt6i_prefsrc.addr; 114 else 115 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL, 116 daddr, prefs, saddr); 117 118 return err; 119 } 120 121 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, 122 const struct in6_addr *saddr, int oif, int flags); 123 u32 rt6_multipath_hash(const struct flowi6 *fl6, const struct sk_buff *skb); 124 125 struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6); 126 127 void fib6_force_start_gc(struct net *net); 128 129 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, 130 const struct in6_addr *addr, bool anycast); 131 132 struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev, 133 int flags); 134 135 /* 136 * support functions for ND 137 * 138 */ 139 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, 140 struct net_device *dev); 141 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, 142 struct net_device *dev, unsigned int pref); 143 144 void rt6_purge_dflt_routers(struct net *net); 145 146 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, 147 const struct in6_addr *gwaddr); 148 149 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif, 150 u32 mark, kuid_t uid); 151 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu); 152 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark, 153 kuid_t uid); 154 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif, 155 u32 mark); 156 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk); 157 158 struct netlink_callback; 159 160 struct rt6_rtnl_dump_arg { 161 struct sk_buff *skb; 162 struct netlink_callback *cb; 163 struct net *net; 164 }; 165 166 int rt6_dump_route(struct rt6_info *rt, void *p_arg); 167 void rt6_ifdown(struct net *net, struct net_device *dev); 168 void rt6_mtu_change(struct net_device *dev, unsigned int mtu); 169 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp); 170 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway); 171 172 static inline const struct rt6_info *skb_rt6_info(const struct sk_buff *skb) 173 { 174 const struct dst_entry *dst = skb_dst(skb); 175 const struct rt6_info *rt6 = NULL; 176 177 if (dst) 178 rt6 = container_of(dst, struct rt6_info, dst); 179 180 return rt6; 181 } 182 183 /* 184 * Store a destination cache entry in a socket 185 */ 186 static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst, 187 const struct in6_addr *daddr, 188 const struct in6_addr *saddr) 189 { 190 struct ipv6_pinfo *np = inet6_sk(sk); 191 192 np->dst_cookie = rt6_get_cookie((struct rt6_info *)dst); 193 sk_setup_caps(sk, dst); 194 np->daddr_cache = daddr; 195 #ifdef CONFIG_IPV6_SUBTREES 196 np->saddr_cache = saddr; 197 #endif 198 } 199 200 static inline bool ipv6_unicast_destination(const struct sk_buff *skb) 201 { 202 struct rt6_info *rt = (struct rt6_info *) skb_dst(skb); 203 204 return rt->rt6i_flags & RTF_LOCAL; 205 } 206 207 static inline bool ipv6_anycast_destination(const struct dst_entry *dst, 208 const struct in6_addr *daddr) 209 { 210 struct rt6_info *rt = (struct rt6_info *)dst; 211 212 return rt->rt6i_flags & RTF_ANYCAST || 213 (rt->rt6i_dst.plen < 127 && 214 ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)); 215 } 216 217 int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, 218 int (*output)(struct net *, struct sock *, struct sk_buff *)); 219 220 static inline int ip6_skb_dst_mtu(struct sk_buff *skb) 221 { 222 struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ? 223 inet6_sk(skb->sk) : NULL; 224 225 return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ? 226 skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb)); 227 } 228 229 static inline bool ip6_sk_accept_pmtu(const struct sock *sk) 230 { 231 return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE && 232 inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT; 233 } 234 235 static inline bool ip6_sk_ignore_df(const struct sock *sk) 236 { 237 return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO || 238 inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT; 239 } 240 241 static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt, 242 struct in6_addr *daddr) 243 { 244 if (rt->rt6i_flags & RTF_GATEWAY) 245 return &rt->rt6i_gateway; 246 else if (unlikely(rt->rt6i_flags & RTF_CACHE)) 247 return &rt->rt6i_dst.addr; 248 else 249 return daddr; 250 } 251 252 static inline bool rt6_duplicate_nexthop(struct rt6_info *a, struct rt6_info *b) 253 { 254 return a->dst.dev == b->dst.dev && 255 a->rt6i_idev == b->rt6i_idev && 256 ipv6_addr_equal(&a->rt6i_gateway, &b->rt6i_gateway) && 257 !lwtunnel_cmp_encap(a->dst.lwtstate, b->dst.lwtstate); 258 } 259 #endif 260