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 static inline bool rt6_qualify_for_ecmp(const struct fib6_info *f6i)
71 /* the RTF_ADDRCONF flag filters out RA's */
72 return !(f6i->fib6_flags & RTF_ADDRCONF) &&
73 f6i->fib6_nh.fib_nh_gw_family;
76 void ip6_route_input(struct sk_buff *skb);
77 struct dst_entry *ip6_route_input_lookup(struct net *net,
78 struct net_device *dev,
80 const struct sk_buff *skb, int flags);
82 struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
83 struct flowi6 *fl6, int flags);
85 static inline struct dst_entry *ip6_route_output(struct net *net,
86 const struct sock *sk,
89 return ip6_route_output_flags(net, sk, fl6, 0);
92 struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
93 const struct sk_buff *skb, int flags);
94 struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
95 int ifindex, struct flowi6 *fl6,
96 const struct sk_buff *skb, int flags);
98 void ip6_route_init_special_entries(void);
99 int ip6_route_init(void);
100 void ip6_route_cleanup(void);
102 int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg);
104 int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags,
105 struct netlink_ext_ack *extack);
106 int ip6_ins_rt(struct net *net, struct fib6_info *f6i);
107 int ip6_del_rt(struct net *net, struct fib6_info *f6i);
109 void rt6_flush_exceptions(struct fib6_info *f6i);
110 void rt6_age_exceptions(struct fib6_info *f6i, struct fib6_gc_args *gc_args,
113 static inline int ip6_route_get_saddr(struct net *net, struct fib6_info *f6i,
114 const struct in6_addr *daddr,
116 struct in6_addr *saddr)
120 if (f6i && f6i->fib6_prefsrc.plen) {
121 *saddr = f6i->fib6_prefsrc.addr;
123 struct net_device *dev = f6i ? fib6_info_nh_dev(f6i) : NULL;
125 err = ipv6_dev_get_saddr(net, dev, daddr, prefs, saddr);
131 struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
132 const struct in6_addr *saddr, int oif,
133 const struct sk_buff *skb, int flags);
134 u32 rt6_multipath_hash(const struct net *net, const struct flowi6 *fl6,
135 const struct sk_buff *skb, struct flow_keys *hkeys);
137 struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6);
139 void fib6_force_start_gc(struct net *net);
141 struct fib6_info *addrconf_f6i_alloc(struct net *net, struct inet6_dev *idev,
142 const struct in6_addr *addr, bool anycast,
145 struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
149 * support functions for ND
152 struct fib6_info *rt6_get_dflt_router(struct net *net,
153 const struct in6_addr *addr,
154 struct net_device *dev);
155 struct fib6_info *rt6_add_dflt_router(struct net *net,
156 const struct in6_addr *gwaddr,
157 struct net_device *dev, unsigned int pref);
159 void rt6_purge_dflt_routers(struct net *net);
161 int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
162 const struct in6_addr *gwaddr);
164 void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif,
165 u32 mark, kuid_t uid);
166 void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu);
167 void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,
169 void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif);
170 void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk);
172 struct netlink_callback;
174 struct rt6_rtnl_dump_arg {
176 struct netlink_callback *cb;
178 struct fib_dump_filter filter;
181 int rt6_dump_route(struct fib6_info *f6i, void *p_arg);
182 void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
183 void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
184 void rt6_clean_tohost(struct net *net, struct in6_addr *gateway);
185 void rt6_sync_up(struct net_device *dev, unsigned char nh_flags);
186 void rt6_disable_ip(struct net_device *dev, unsigned long event);
187 void rt6_sync_down_dev(struct net_device *dev, unsigned long event);
188 void rt6_multipath_rebalance(struct fib6_info *f6i);
190 void rt6_uncached_list_add(struct rt6_info *rt);
191 void rt6_uncached_list_del(struct rt6_info *rt);
193 static inline const struct rt6_info *skb_rt6_info(const struct sk_buff *skb)
195 const struct dst_entry *dst = skb_dst(skb);
196 const struct rt6_info *rt6 = NULL;
199 rt6 = container_of(dst, struct rt6_info, dst);
205 * Store a destination cache entry in a socket
207 static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
208 const struct in6_addr *daddr,
209 const struct in6_addr *saddr)
211 struct ipv6_pinfo *np = inet6_sk(sk);
213 np->dst_cookie = rt6_get_cookie((struct rt6_info *)dst);
214 sk_setup_caps(sk, dst);
215 np->daddr_cache = daddr;
216 #ifdef CONFIG_IPV6_SUBTREES
217 np->saddr_cache = saddr;
221 void ip6_sk_dst_store_flow(struct sock *sk, struct dst_entry *dst,
222 const struct flowi6 *fl6);
224 static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
226 struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
228 return rt->rt6i_flags & RTF_LOCAL;
231 static inline bool ipv6_anycast_destination(const struct dst_entry *dst,
232 const struct in6_addr *daddr)
234 struct rt6_info *rt = (struct rt6_info *)dst;
236 return rt->rt6i_flags & RTF_ANYCAST ||
237 (rt->rt6i_dst.plen < 127 &&
238 ipv6_addr_equal(&rt->rt6i_dst.addr, daddr));
241 int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
242 int (*output)(struct net *, struct sock *, struct sk_buff *));
244 static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
246 struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?
247 inet6_sk(skb->sk) : NULL;
249 return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ?
250 skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb));
253 static inline bool ip6_sk_accept_pmtu(const struct sock *sk)
255 return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE &&
256 inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT;
259 static inline bool ip6_sk_ignore_df(const struct sock *sk)
261 return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO ||
262 inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT;
265 static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt,
266 struct in6_addr *daddr)
268 if (rt->rt6i_flags & RTF_GATEWAY)
269 return &rt->rt6i_gateway;
270 else if (unlikely(rt->rt6i_flags & RTF_CACHE))
271 return &rt->rt6i_dst.addr;
276 static inline bool rt6_duplicate_nexthop(struct fib6_info *a, struct fib6_info *b)
278 struct fib6_nh *nha = &a->fib6_nh, *nhb = &b->fib6_nh;
280 return nha->fib_nh_dev == nhb->fib_nh_dev &&
281 ipv6_addr_equal(&nha->fib_nh_gw6, &nhb->fib_nh_gw6) &&
282 !lwtunnel_cmp_encap(nha->fib_nh_lws, nhb->fib_nh_lws);
285 static inline unsigned int ip6_dst_mtu_forward(const struct dst_entry *dst)
287 struct inet6_dev *idev;
290 if (dst_metric_locked(dst, RTAX_MTU)) {
291 mtu = dst_metric_raw(dst, RTAX_MTU);
298 idev = __in6_dev_get(dst->dev);
300 mtu = idev->cnf.mtu6;
306 u32 ip6_mtu_from_fib6(const struct fib6_result *res,
307 const struct in6_addr *daddr,
308 const struct in6_addr *saddr);
310 struct neighbour *ip6_neigh_lookup(const struct in6_addr *gw,
311 struct net_device *dev, struct sk_buff *skb,