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 */
21 #include <net/addrconf.h>
23 #include <net/ip6_fib.h>
25 #include <net/lwtunnel.h>
27 #include <linux/ipv6.h>
28 #include <linux/route.h>
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
38 /* We do not (yet ?) support IPv6 jumbograms (RFC 2675)
39 * Unlike IPv4, hdr->seg_len doesn't include the IPv6 header
41 #define IP6_MAX_MTU (0xFFFF + sizeof(struct ipv6hdr))
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.
51 static inline int rt6_srcprefs2flags(unsigned int srcprefs)
53 /* No need to bitmask because srcprefs have only 3 bits. */
57 static inline unsigned int rt6_flags2srcprefs(int flags)
59 return (flags >> 3) & 7;
62 static inline bool rt6_need_strict(const struct in6_addr *daddr)
64 return ipv6_addr_type(daddr) &
65 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
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);
73 struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
74 struct flowi6 *fl6, int flags);
76 static inline struct dst_entry *ip6_route_output(struct net *net,
77 const struct sock *sk,
80 return ip6_route_output_flags(net, sk, fl6, 0);
83 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
85 struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
86 int ifindex, struct flowi6 *fl6, int flags);
88 void ip6_route_init_special_entries(void);
89 int ip6_route_init(void);
90 void ip6_route_cleanup(void);
92 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg);
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 *);
98 static inline int ip6_route_get_saddr(struct net *net, struct rt6_info *rt,
99 const struct in6_addr *daddr,
101 struct in6_addr *saddr)
103 struct inet6_dev *idev =
104 rt ? ip6_dst_idev((struct dst_entry *)rt) : NULL;
107 if (rt && rt->rt6i_prefsrc.plen)
108 *saddr = rt->rt6i_prefsrc.addr;
110 err = ipv6_dev_get_saddr(net, idev ? idev->dev : NULL,
111 daddr, prefs, saddr);
116 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
117 const struct in6_addr *saddr, int oif, int flags);
119 struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6);
121 void fib6_force_start_gc(struct net *net);
123 struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
124 const struct in6_addr *addr, bool anycast);
126 struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
130 * support functions for ND
133 struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr,
134 struct net_device *dev);
135 struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
136 struct net_device *dev, unsigned int pref);
138 void rt6_purge_dflt_routers(struct net *net);
140 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
141 const struct in6_addr *gwaddr);
143 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif,
144 u32 mark, kuid_t uid);
145 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu);
146 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,
148 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
150 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk);
152 struct netlink_callback;
154 struct rt6_rtnl_dump_arg {
156 struct netlink_callback *cb;
160 int rt6_dump_route(struct rt6_info *rt, void *p_arg);
161 void rt6_ifdown(struct net *net, struct net_device *dev);
162 void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
163 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
164 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway);
168 * Store a destination cache entry in a socket
170 static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
171 const struct in6_addr *daddr,
172 const struct in6_addr *saddr)
174 struct ipv6_pinfo *np = inet6_sk(sk);
176 np->dst_cookie = rt6_get_cookie((struct rt6_info *)dst);
177 sk_setup_caps(sk, dst);
178 np->daddr_cache = daddr;
179 #ifdef CONFIG_IPV6_SUBTREES
180 np->saddr_cache = saddr;
184 static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
186 struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
188 return rt->rt6i_flags & RTF_LOCAL;
191 static inline bool ipv6_anycast_destination(const struct dst_entry *dst,
192 const struct in6_addr *daddr)
194 struct rt6_info *rt = (struct rt6_info *)dst;
196 return rt->rt6i_flags & RTF_ANYCAST ||
197 (rt->rt6i_dst.plen != 128 &&
198 ipv6_addr_equal(&rt->rt6i_dst.addr, daddr));
201 int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
202 int (*output)(struct net *, struct sock *, struct sk_buff *));
204 static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
206 struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?
207 inet6_sk(skb->sk) : NULL;
209 return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ?
210 skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
213 static inline bool ip6_sk_accept_pmtu(const struct sock *sk)
215 return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE &&
216 inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT;
219 static inline bool ip6_sk_ignore_df(const struct sock *sk)
221 return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO ||
222 inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT;
225 static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt,
226 struct in6_addr *daddr)
228 if (rt->rt6i_flags & RTF_GATEWAY)
229 return &rt->rt6i_gateway;
230 else if (unlikely(rt->rt6i_flags & RTF_CACHE))
231 return &rt->rt6i_dst.addr;
236 static inline bool rt6_duplicate_nexthop(struct rt6_info *a, struct rt6_info *b)
238 return a->dst.dev == b->dst.dev &&
239 a->rt6i_idev == b->rt6i_idev &&
240 ipv6_addr_equal(&a->rt6i_gateway, &b->rt6i_gateway) &&
241 !lwtunnel_cmp_encap(a->dst.lwtstate, b->dst.lwtstate);