1 #ifndef _NET_IP6_ROUTE_H
2 #define _NET_IP6_ROUTE_H
8 #if defined(__BIG_ENDIAN_BITFIELD)
12 #elif defined(__LITTLE_ENDIAN_BITFIELD)
18 __u8 prefix[0]; /* 0,8 or 16 */
22 #include <net/ip6_fib.h>
25 #include <linux/ipv6.h>
26 #include <linux/route.h>
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
35 /* We do not (yet ?) support IPv6 jumbograms (RFC 2675)
36 * Unlike IPv4, hdr->seg_len doesn't include the IPv6 header
38 #define IP6_MAX_MTU (0xFFFF + sizeof(struct ipv6hdr))
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.
48 static inline int rt6_srcprefs2flags(unsigned int srcprefs)
50 /* No need to bitmask because srcprefs have only 3 bits. */
54 static inline unsigned int rt6_flags2srcprefs(int flags)
56 return (flags >> 3) & 7;
59 static inline bool rt6_need_strict(const struct in6_addr *daddr)
61 return ipv6_addr_type(daddr) &
62 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
65 void ip6_route_input(struct sk_buff *skb);
67 struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
68 struct flowi6 *fl6, int flags);
70 static inline struct dst_entry *ip6_route_output(struct net *net,
71 const struct sock *sk,
74 return ip6_route_output_flags(net, sk, fl6, 0);
77 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
80 int ip6_route_init(void);
81 void ip6_route_cleanup(void);
83 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg);
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 *);
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);
93 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
94 const struct in6_addr *saddr, int oif, int flags);
96 struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6);
97 int icmp6_dst_gc(void);
99 void fib6_force_start_gc(struct net *net);
101 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
102 const struct in6_addr *addr, bool anycast);
105 * support functions for ND
108 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr,
109 struct net_device *dev);
110 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
111 struct net_device *dev, unsigned int pref);
113 void rt6_purge_dflt_routers(struct net *net);
115 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
116 const struct in6_addr *gwaddr);
118 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif,
120 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu);
121 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark);
122 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
124 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk);
126 struct netlink_callback;
128 struct rt6_rtnl_dump_arg {
130 struct netlink_callback *cb;
134 int rt6_dump_route(struct rt6_info *rt, void *p_arg);
135 void rt6_ifdown(struct net *net, struct net_device *dev);
136 void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
137 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
138 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway);
142 * Store a destination cache entry in a socket
144 static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
145 const struct in6_addr *daddr,
146 const struct in6_addr *saddr)
148 struct ipv6_pinfo *np = inet6_sk(sk);
150 np->dst_cookie = rt6_get_cookie((struct rt6_info *)dst);
151 sk_setup_caps(sk, dst);
152 np->daddr_cache = daddr;
153 #ifdef CONFIG_IPV6_SUBTREES
154 np->saddr_cache = saddr;
158 static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
160 struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
162 return rt->rt6i_flags & RTF_LOCAL;
165 static inline bool ipv6_anycast_destination(const struct dst_entry *dst,
166 const struct in6_addr *daddr)
168 struct rt6_info *rt = (struct rt6_info *)dst;
170 return rt->rt6i_flags & RTF_ANYCAST ||
171 (rt->rt6i_dst.plen != 128 &&
172 ipv6_addr_equal(&rt->rt6i_dst.addr, daddr));
175 int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
176 int (*output)(struct net *, struct sock *, struct sk_buff *));
178 static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
180 struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?
181 inet6_sk(skb->sk) : NULL;
183 return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ?
184 skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
187 static inline bool ip6_sk_accept_pmtu(const struct sock *sk)
189 return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE &&
190 inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT;
193 static inline bool ip6_sk_ignore_df(const struct sock *sk)
195 return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO ||
196 inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT;
199 static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt,
200 struct in6_addr *daddr)
202 if (rt->rt6i_flags & RTF_GATEWAY)
203 return &rt->rt6i_gateway;
204 else if (unlikely(rt->rt6i_flags & RTF_CACHE))
205 return &rt->rt6i_dst.addr;