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(struct net *net, const struct sock *sk, 68 struct flowi6 *fl6); 69 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6, 70 int flags); 71 72 int ip6_route_init(void); 73 void ip6_route_cleanup(void); 74 75 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg); 76 77 int ip6_route_add(struct fib6_config *cfg); 78 int ip6_ins_rt(struct rt6_info *); 79 int ip6_del_rt(struct rt6_info *); 80 81 int ip6_route_get_saddr(struct net *net, struct rt6_info *rt, 82 const struct in6_addr *daddr, unsigned int prefs, 83 struct in6_addr *saddr); 84 85 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, 86 const struct in6_addr *saddr, int oif, int flags); 87 88 struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6); 89 int icmp6_dst_gc(void); 90 91 void fib6_force_start_gc(struct net *net); 92 93 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, 94 const struct in6_addr *addr, bool anycast); 95 96 /* 97 * support functions for ND 98 * 99 */ 100 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, 101 struct net_device *dev); 102 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr, 103 struct net_device *dev, unsigned int pref); 104 105 void rt6_purge_dflt_routers(struct net *net); 106 107 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, 108 const struct in6_addr *gwaddr); 109 110 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif, 111 u32 mark); 112 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu); 113 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark); 114 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif, 115 u32 mark); 116 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk); 117 118 struct netlink_callback; 119 120 struct rt6_rtnl_dump_arg { 121 struct sk_buff *skb; 122 struct netlink_callback *cb; 123 struct net *net; 124 }; 125 126 int rt6_dump_route(struct rt6_info *rt, void *p_arg); 127 void rt6_ifdown(struct net *net, struct net_device *dev); 128 void rt6_mtu_change(struct net_device *dev, unsigned int mtu); 129 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp); 130 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway); 131 132 133 /* 134 * Store a destination cache entry in a socket 135 */ 136 static inline void __ip6_dst_store(struct sock *sk, struct dst_entry *dst, 137 const struct in6_addr *daddr, 138 const struct in6_addr *saddr) 139 { 140 struct ipv6_pinfo *np = inet6_sk(sk); 141 struct rt6_info *rt = (struct rt6_info *) dst; 142 143 sk_setup_caps(sk, dst); 144 np->daddr_cache = daddr; 145 #ifdef CONFIG_IPV6_SUBTREES 146 np->saddr_cache = saddr; 147 #endif 148 np->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0; 149 } 150 151 static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst, 152 struct in6_addr *daddr, struct in6_addr *saddr) 153 { 154 spin_lock(&sk->sk_dst_lock); 155 __ip6_dst_store(sk, dst, daddr, saddr); 156 spin_unlock(&sk->sk_dst_lock); 157 } 158 159 static inline bool ipv6_unicast_destination(const struct sk_buff *skb) 160 { 161 struct rt6_info *rt = (struct rt6_info *) skb_dst(skb); 162 163 return rt->rt6i_flags & RTF_LOCAL; 164 } 165 166 static inline bool ipv6_anycast_destination(const struct sk_buff *skb) 167 { 168 struct rt6_info *rt = (struct rt6_info *) skb_dst(skb); 169 170 return rt->rt6i_flags & RTF_ANYCAST; 171 } 172 173 int ip6_fragment(struct sock *sk, struct sk_buff *skb, 174 int (*output)(struct sock *, struct sk_buff *)); 175 176 static inline int ip6_skb_dst_mtu(struct sk_buff *skb) 177 { 178 struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ? 179 inet6_sk(skb->sk) : NULL; 180 181 return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ? 182 skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb)); 183 } 184 185 static inline bool ip6_sk_accept_pmtu(const struct sock *sk) 186 { 187 return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE && 188 inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT; 189 } 190 191 static inline bool ip6_sk_ignore_df(const struct sock *sk) 192 { 193 return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO || 194 inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT; 195 } 196 197 static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt) 198 { 199 return &rt->rt6i_gateway; 200 } 201 202 #endif 203