1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _NET_IP6_ROUTE_H
3 #define _NET_IP6_ROUTE_H
9 #if defined(__BIG_ENDIAN_BITFIELD)
13 #elif defined(__LITTLE_ENDIAN_BITFIELD)
19 __u8 prefix[0]; /* 0,8 or 16 */
22 #include <net/addrconf.h>
24 #include <net/ip6_fib.h>
26 #include <net/lwtunnel.h>
28 #include <linux/ipv6.h>
29 #include <linux/route.h>
31 #define RT6_LOOKUP_F_IFACE 0x00000001
32 #define RT6_LOOKUP_F_REACHABLE 0x00000002
33 #define RT6_LOOKUP_F_HAS_SADDR 0x00000004
34 #define RT6_LOOKUP_F_SRCPREF_TMP 0x00000008
35 #define RT6_LOOKUP_F_SRCPREF_PUBLIC 0x00000010
36 #define RT6_LOOKUP_F_SRCPREF_COA 0x00000020
37 #define RT6_LOOKUP_F_IGNORE_LINKSTATE 0x00000040
39 /* We do not (yet ?) support IPv6 jumbograms (RFC 2675)
40 * Unlike IPv4, hdr->seg_len doesn't include the IPv6 header
42 #define IP6_MAX_MTU (0xFFFF + sizeof(struct ipv6hdr))
45 * rt6_srcprefs2flags() and rt6_flags2srcprefs() translate
46 * between IPV6_ADDR_PREFERENCES socket option values
47 * IPV6_PREFER_SRC_TMP = 0x1
48 * IPV6_PREFER_SRC_PUBLIC = 0x2
49 * IPV6_PREFER_SRC_COA = 0x4
50 * and above RT6_LOOKUP_F_SRCPREF_xxx flags.
52 static inline int rt6_srcprefs2flags(unsigned int srcprefs)
54 /* No need to bitmask because srcprefs have only 3 bits. */
58 static inline unsigned int rt6_flags2srcprefs(int flags)
60 return (flags >> 3) & 7;
63 static inline bool rt6_need_strict(const struct in6_addr *daddr)
65 return ipv6_addr_type(daddr) &
66 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
69 void ip6_route_input(struct sk_buff *skb);
70 struct dst_entry *ip6_route_input_lookup(struct net *net,
71 struct net_device *dev,
73 const struct sk_buff *skb, int flags);
75 struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
76 struct flowi6 *fl6, int flags);
78 static inline struct dst_entry *ip6_route_output(struct net *net,
79 const struct sock *sk,
82 return ip6_route_output_flags(net, sk, fl6, 0);
85 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
86 const struct sk_buff *skb, int flags);
87 struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
88 int ifindex, struct flowi6 *fl6,
89 const struct sk_buff *skb, int flags);
91 void ip6_route_init_special_entries(void);
92 int ip6_route_init(void);
93 void ip6_route_cleanup(void);
95 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg);
97 int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags,
98 struct netlink_ext_ack *extack);
99 int ip6_ins_rt(struct net *net, struct fib6_info *f6i);
100 int ip6_del_rt(struct net *net, struct fib6_info *f6i);
102 void rt6_flush_exceptions(struct fib6_info *f6i);
103 void rt6_age_exceptions(struct fib6_info *f6i, struct fib6_gc_args *gc_args,
106 static inline int ip6_route_get_saddr(struct net *net, struct fib6_info *f6i,
107 const struct in6_addr *daddr,
109 struct in6_addr *saddr)
113 if (f6i && f6i->fib6_prefsrc.plen) {
114 *saddr = f6i->fib6_prefsrc.addr;
116 struct net_device *dev = f6i ? fib6_info_nh_dev(f6i) : NULL;
118 err = ipv6_dev_get_saddr(net, dev, daddr, prefs, saddr);
124 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
125 const struct in6_addr *saddr, int oif,
126 const struct sk_buff *skb, int flags);
127 u32 rt6_multipath_hash(const struct net *net, const struct flowi6 *fl6,
128 const struct sk_buff *skb, struct flow_keys *hkeys);
130 struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6);
132 void fib6_force_start_gc(struct net *net);
134 struct fib6_info *addrconf_f6i_alloc(struct net *net, struct inet6_dev *idev,
135 const struct in6_addr *addr, bool anycast,
138 struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
142 * support functions for ND
145 struct fib6_info *rt6_get_dflt_router(struct net *net,
146 const struct in6_addr *addr,
147 struct net_device *dev);
148 struct fib6_info *rt6_add_dflt_router(struct net *net,
149 const struct in6_addr *gwaddr,
150 struct net_device *dev, unsigned int pref);
152 void rt6_purge_dflt_routers(struct net *net);
154 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
155 const struct in6_addr *gwaddr);
157 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif,
158 u32 mark, kuid_t uid);
159 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu);
160 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,
162 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
164 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk);
166 struct netlink_callback;
168 struct rt6_rtnl_dump_arg {
170 struct netlink_callback *cb;
174 int rt6_dump_route(struct fib6_info *f6i, void *p_arg);
175 void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
176 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
177 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway);
178 void rt6_sync_up(struct net_device *dev, unsigned int nh_flags);
179 void rt6_disable_ip(struct net_device *dev, unsigned long event);
180 void rt6_sync_down_dev(struct net_device *dev, unsigned long event);
181 void rt6_multipath_rebalance(struct fib6_info *f6i);
183 void rt6_uncached_list_add(struct rt6_info *rt);
184 void rt6_uncached_list_del(struct rt6_info *rt);
186 static inline const struct rt6_info *skb_rt6_info(const struct sk_buff *skb)
188 const struct dst_entry *dst = skb_dst(skb);
189 const struct rt6_info *rt6 = NULL;
192 rt6 = container_of(dst, struct rt6_info, dst);
198 * Store a destination cache entry in a socket
200 static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
201 const struct in6_addr *daddr,
202 const struct in6_addr *saddr)
204 struct ipv6_pinfo *np = inet6_sk(sk);
206 np->dst_cookie = rt6_get_cookie((struct rt6_info *)dst);
207 sk_setup_caps(sk, dst);
208 np->daddr_cache = daddr;
209 #ifdef CONFIG_IPV6_SUBTREES
210 np->saddr_cache = saddr;
214 void ip6_sk_dst_store_flow(struct sock *sk, struct dst_entry *dst,
215 const struct flowi6 *fl6);
217 static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
219 struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
221 return rt->rt6i_flags & RTF_LOCAL;
224 static inline bool ipv6_anycast_destination(const struct dst_entry *dst,
225 const struct in6_addr *daddr)
227 struct rt6_info *rt = (struct rt6_info *)dst;
229 return rt->rt6i_flags & RTF_ANYCAST ||
230 (rt->rt6i_dst.plen < 127 &&
231 ipv6_addr_equal(&rt->rt6i_dst.addr, daddr));
234 int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
235 int (*output)(struct net *, struct sock *, struct sk_buff *));
237 static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
239 struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?
240 inet6_sk(skb->sk) : NULL;
242 return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ?
243 skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
246 static inline bool ip6_sk_accept_pmtu(const struct sock *sk)
248 return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE &&
249 inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT;
252 static inline bool ip6_sk_ignore_df(const struct sock *sk)
254 return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO ||
255 inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT;
258 static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt,
259 struct in6_addr *daddr)
261 if (rt->rt6i_flags & RTF_GATEWAY)
262 return &rt->rt6i_gateway;
263 else if (unlikely(rt->rt6i_flags & RTF_CACHE))
264 return &rt->rt6i_dst.addr;
269 static inline bool rt6_duplicate_nexthop(struct fib6_info *a, struct fib6_info *b)
271 return a->fib6_nh.nh_dev == b->fib6_nh.nh_dev &&
272 ipv6_addr_equal(&a->fib6_nh.nh_gw, &b->fib6_nh.nh_gw) &&
273 !lwtunnel_cmp_encap(a->fib6_nh.nh_lwtstate, b->fib6_nh.nh_lwtstate);
276 static inline unsigned int ip6_dst_mtu_forward(const struct dst_entry *dst)
278 struct inet6_dev *idev;
281 if (dst_metric_locked(dst, RTAX_MTU)) {
282 mtu = dst_metric_raw(dst, RTAX_MTU);
289 idev = __in6_dev_get(dst->dev);
291 mtu = idev->cnf.mtu6;
297 u32 ip6_mtu_from_fib6(struct fib6_info *f6i, struct in6_addr *daddr,
298 struct in6_addr *saddr);
300 struct neighbour *ip6_neigh_lookup(const struct in6_addr *gw,
301 struct net_device *dev, struct sk_buff *skb,