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