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Merge tag 'nf-24-02-08' of git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf
[linux-block.git] / include / net / ip6_route.h
CommitLineData
b2441318 1/* SPDX-License-Identifier: GPL-2.0 */
1da177e4
LT		 2#ifndef _NET_IP6_ROUTE_H
3#define _NET_IP6_ROUTE_H
4
949d6b40
JK		 5#include <net/addrconf.h>
6#include <net/flow.h>
7#include <net/ip6_fib.h>
8#include <net/sock.h>
9#include <net/lwtunnel.h>
10#include <linux/ip.h>
11#include <linux/ipv6.h>
12#include <linux/route.h>
13#include <net/nexthop.h>
14
70ceb4f5
YH		 15struct route_info {
16 __u8 type;
17 __u8 length;
18 __u8 prefix_len;
19#if defined(__BIG_ENDIAN_BITFIELD)
20 __u8 reserved_h:3,
21 route_pref:2,
22 reserved_l:3;
23#elif defined(__LITTLE_ENDIAN_BITFIELD)
24 __u8 reserved_l:3,
25 route_pref:2,
26 reserved_h:3;
27#endif
e69a4adc 28 __be32 lifetime;
207644f5 29 __u8 prefix[]; /* 0,8 or 16 */
70ceb4f5
YH		 30};
31
7cbca67c
YH		 32#define RT6_LOOKUP_F_IFACE 0x00000001
33#define RT6_LOOKUP_F_REACHABLE 0x00000002
34#define RT6_LOOKUP_F_HAS_SADDR 0x00000004
35#define RT6_LOOKUP_F_SRCPREF_TMP 0x00000008
36#define RT6_LOOKUP_F_SRCPREF_PUBLIC 0x00000010
37#define RT6_LOOKUP_F_SRCPREF_COA 0x00000020
d5d32e4b 38#define RT6_LOOKUP_F_IGNORE_LINKSTATE 0x00000040
0e09edcc 39#define RT6_LOOKUP_F_DST_NOREF 0x00000080
77d16f45 40
30f78d8e
ED		 41/* We do not (yet ?) support IPv6 jumbograms (RFC 2675)
42 * Unlike IPv4, hdr->seg_len doesn't include the IPv6 header
43 */
44#define IP6_MAX_MTU (0xFFFF + sizeof(struct ipv6hdr))
45
0c9a2ac1
YH		 46/*
47 * rt6_srcprefs2flags() and rt6_flags2srcprefs() translate
48 * between IPV6_ADDR_PREFERENCES socket option values
49 * IPV6_PREFER_SRC_TMP = 0x1
50 * IPV6_PREFER_SRC_PUBLIC = 0x2
51 * IPV6_PREFER_SRC_COA = 0x4
52 * and above RT6_LOOKUP_F_SRCPREF_xxx flags.
53 */
54static inline int rt6_srcprefs2flags(unsigned int srcprefs)
55{
fa17a6d8 56 return (srcprefs & IPV6_PREFER_SRC_MASK) << 3;
0c9a2ac1
YH		 57}
58
59static inline unsigned int rt6_flags2srcprefs(int flags)
60{
fa17a6d8 61 return (flags >> 3) & IPV6_PREFER_SRC_MASK;
0c9a2ac1 62}
1da177e4 63
60ea37f7
WY		 64static inline bool rt6_need_strict(const struct in6_addr *daddr)
65{
66 return ipv6_addr_type(daddr) &
67 (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
68}
fbfe95a4 69
f88d8ea6
DA		 70/* fib entries using a nexthop object can not be coalesced into
71 * a multipath route
72 */
33bd5ac5
DA		 73static inline bool rt6_qualify_for_ecmp(const struct fib6_info *f6i)
74{
be659b8d 75 /* the RTF_ADDRCONF flag filters out RA's */
f88d8ea6 76 return !(f6i->fib6_flags & RTF_ADDRCONF) && !f6i->nh &&
1cf844c7 77 f6i->fib6_nh->fib_nh_gw_family;
33bd5ac5
DA		 78}
79
5c3a0fd7 80void ip6_route_input(struct sk_buff *skb);
d409b847
MB		 81struct dst_entry *ip6_route_input_lookup(struct net *net,
82 struct net_device *dev,
b75cc8f9
DA		 83 struct flowi6 *fl6,
84 const struct sk_buff *skb, int flags);
1da177e4 85
6f21c96a
PA		 86struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
87 struct flowi6 *fl6, int flags);
88
89static inline struct dst_entry *ip6_route_output(struct net *net,
90 const struct sock *sk,
91 struct flowi6 *fl6)
92{
93 return ip6_route_output_flags(net, sk, fl6, 0);
94}
95
d64a1f57
WW		 96/* Only conditionally release dst if flags indicates
97 * !RT6_LOOKUP_F_DST_NOREF or dst is in uncached_list.
98 */
99static inline void ip6_rt_put_flags(struct rt6_info *rt, int flags)
100{
101 if (!(flags & RT6_LOOKUP_F_DST_NOREF) ||
d288a162 102 !list_empty(&rt->dst.rt_uncached))
d64a1f57
WW		 103 ip6_rt_put(rt);
104}
105
5c3a0fd7 106struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
b75cc8f9 107 const struct sk_buff *skb, int flags);
9ff74384 108struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
b75cc8f9
DA		 109 int ifindex, struct flowi6 *fl6,
110 const struct sk_buff *skb, int flags);
1da177e4 111
2f460933 112void ip6_route_init_special_entries(void);
5c3a0fd7
JP		 113int ip6_route_init(void);
114void ip6_route_cleanup(void);
1da177e4 115
7c1552da
CH		 116int ipv6_route_ioctl(struct net *net, unsigned int cmd,
117 struct in6_rtmsg *rtmsg);
1da177e4 118
acb54e3c
DA		 119int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags,
120 struct netlink_ext_ack *extack);
93c2fb25 121int ip6_ins_rt(struct net *net, struct fib6_info *f6i);
11dd74b3 122int ip6_del_rt(struct net *net, struct fib6_info *f6i, bool skip_notify);
1da177e4 123
93c2fb25
DA		 124void rt6_flush_exceptions(struct fib6_info *f6i);
125void rt6_age_exceptions(struct fib6_info *f6i, struct fib6_gc_args *gc_args,
c757faa8 126 unsigned long now);
35732d01 127
93c2fb25 128static inline int ip6_route_get_saddr(struct net *net, struct fib6_info *f6i,
a2e2ff56
DA		 129 const struct in6_addr *daddr,
130 unsigned int prefs,
131 struct in6_addr *saddr)
132{
a2e2ff56
DA		 133 int err = 0;
134
6fe74941 135 if (f6i && f6i->fib6_prefsrc.plen) {
93c2fb25 136 *saddr = f6i->fib6_prefsrc.addr;
6fe74941
DA		 137 } else {
138 struct net_device *dev = f6i ? fib6_info_nh_dev(f6i) : NULL;
139
140 err = ipv6_dev_get_saddr(net, dev, daddr, prefs, saddr);
141 }
a2e2ff56
DA		 142
143 return err;
144}
c3968a85 145
5c3a0fd7 146struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
b75cc8f9
DA		 147 const struct in6_addr *saddr, int oif,
148 const struct sk_buff *skb, int flags);
b4bac172
DA		 149u32 rt6_multipath_hash(const struct net *net, const struct flowi6 *fl6,
150 const struct sk_buff *skb, struct flow_keys *hkeys);
1da177e4 151
5c3a0fd7 152struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6);
3b00944c 153
5c3a0fd7 154void fib6_force_start_gc(struct net *net);
1da177e4 155
360a9887 156struct fib6_info *addrconf_f6i_alloc(struct net *net, struct inet6_dev *idev,
8d1c802b 157 const struct in6_addr *addr, bool anycast,
7f6c4039 158 gfp_t gfp_flags, struct netlink_ext_ack *extack);
1da177e4 159
9ab179d8
DA		 160struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev,
161 int flags);
162
1da177e4
LT		 163/*
164 * support functions for ND
165 *
166 */
8d1c802b 167struct fib6_info *rt6_get_dflt_router(struct net *net,
afb1d4b5 168 const struct in6_addr *addr,
5c3a0fd7 169 struct net_device *dev);
8d1c802b 170struct fib6_info *rt6_add_dflt_router(struct net *net,
afb1d4b5 171 const struct in6_addr *gwaddr,
6b2e04bc
PC		 172 struct net_device *dev, unsigned int pref,
173 u32 defrtr_usr_metric);
5c3a0fd7
JP		 174
175void rt6_purge_dflt_routers(struct net *net);
176
177int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
178 const struct in6_addr *gwaddr);
179
180void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif,
e2d118a1 181 u32 mark, kuid_t uid);
5c3a0fd7 182void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu);
e2d118a1
LC		 183void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,
184 kuid_t uid);
d456336d 185void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif);
5c3a0fd7 186void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk);
1da177e4 187
1da177e4 188struct netlink_callback;
1da177e4 189
fd2c3ef7 190struct rt6_rtnl_dump_arg {
1b43af54
PM		 191 struct sk_buff *skb;
192 struct netlink_callback *cb;
191cd582 193 struct net *net;
4724676d 194 struct fib_dump_filter filter;
1b43af54
PM		 195};
196
1e47b483 197int rt6_dump_route(struct fib6_info *f6i, void *p_arg, unsigned int skip);
5c3a0fd7
JP		 198void rt6_mtu_change(struct net_device *dev, unsigned int mtu);
199void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
be7a010d 200void rt6_clean_tohost(struct net *net, struct in6_addr *gateway);
ecc5663c 201void rt6_sync_up(struct net_device *dev, unsigned char nh_flags);
4c981e28 202void rt6_disable_ip(struct net_device *dev, unsigned long event);
27c6fa73 203void rt6_sync_down_dev(struct net_device *dev, unsigned long event);
93c2fb25 204void rt6_multipath_rebalance(struct fib6_info *f6i);
1da177e4 205
510c321b
XL		 206void rt6_uncached_list_add(struct rt6_info *rt);
207void rt6_uncached_list_del(struct rt6_info *rt);
208
1b70d792
DA		 209static inline const struct rt6_info *skb_rt6_info(const struct sk_buff *skb)
210{
211 const struct dst_entry *dst = skb_dst(skb);
212 const struct rt6_info *rt6 = NULL;
213
214 if (dst)
215 rt6 = container_of(dst, struct rt6_info, dst);
216
217 return rt6;
218}
1da177e4
LT		 219
220/*
221 * Store a destination cache entry in a socket
222 */
6bd4f355
ED		 223static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
224 const struct in6_addr *daddr,
225 const struct in6_addr *saddr)
1da177e4
LT		 226{
227 struct ipv6_pinfo *np = inet6_sk(sk);
1da177e4 228
6bd4f355 229 np->dst_cookie = rt6_get_cookie((struct rt6_info *)dst);
f83ef8c0 230 sk_setup_caps(sk, dst);
1da177e4 231 np->daddr_cache = daddr;
8e1ef0a9
YH		 232#ifdef CONFIG_IPV6_SUBTREES
233 np->saddr_cache = saddr;
234#endif
1da177e4
LT		 235}
236
7d6850f7
AK		 237void ip6_sk_dst_store_flow(struct sock *sk, struct dst_entry *dst,
238 const struct flowi6 *fl6);
239
a50feda5 240static inline bool ipv6_unicast_destination(const struct sk_buff *skb)
1da177e4 241{
adf30907 242 struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
1da177e4
LT		 243
244 return rt->rt6i_flags & RTF_LOCAL;
245}
246
2647a9b0
MKL		 247static inline bool ipv6_anycast_destination(const struct dst_entry *dst,
248 const struct in6_addr *daddr)
509aba3b 249{
2647a9b0 250 struct rt6_info *rt = (struct rt6_info *)dst;
509aba3b 251
2647a9b0 252 return rt->rt6i_flags & RTF_ANYCAST ||
ccdb2d17 253 (rt->rt6i_dst.plen < 127 &&
03e2a984 254 !(rt->rt6i_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) &&
2647a9b0 255 ipv6_addr_equal(&rt->rt6i_dst.addr, daddr));
509aba3b
FLB		 256}
257
7d8c6e39
EB		 258int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
259 int (*output)(struct net *, struct sock *, struct sk_buff *));
ad0081e4 260
8d22679d 261static inline unsigned int ip6_skb_dst_mtu(const struct sk_buff *skb)
ad0081e4 262{
8d22679d 263 const struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ?
f60e5990 264 inet6_sk(skb->sk) : NULL;
8d22679d
ED		 265 const struct dst_entry *dst = skb_dst(skb);
266 unsigned int mtu;
ad0081e4 267
6b724bc4 268 if (np && READ_ONCE(np->pmtudisc) >= IPV6_PMTUDISC_PROBE) {
8d22679d
ED		 269 mtu = READ_ONCE(dst->dev->mtu);
270 mtu -= lwtunnel_headroom(dst->lwtstate, mtu);
271 } else {
272 mtu = dst_mtu(dst);
273 }
fade5641 274 return mtu;
ad0081e4
DS		 275}
276
93b36cf3
HFS		 277static inline bool ip6_sk_accept_pmtu(const struct sock *sk)
278{
6b724bc4
ED		 279 u8 pmtudisc = READ_ONCE(inet6_sk(sk)->pmtudisc);
280
281 return pmtudisc != IPV6_PMTUDISC_INTERFACE &&
282 pmtudisc != IPV6_PMTUDISC_OMIT;
0b95227a
HFS		 283}
284
60ff7467 285static inline bool ip6_sk_ignore_df(const struct sock *sk)
0b95227a 286{
6b724bc4
ED		 287 u8 pmtudisc = READ_ONCE(inet6_sk(sk)->pmtudisc);
288
289 return pmtudisc < IPV6_PMTUDISC_DO ||
290 pmtudisc == IPV6_PMTUDISC_OMIT;
93b36cf3
HFS		 291}
292
9b1c1ef1
ND		 293static inline const struct in6_addr *rt6_nexthop(const struct rt6_info *rt,
294 const struct in6_addr *daddr)
9bb5a148 295{
2647a9b0
MKL		 296 if (rt->rt6i_flags & RTF_GATEWAY)
297 return &rt->rt6i_gateway;
45e4fd26 298 else if (unlikely(rt->rt6i_flags & RTF_CACHE))
2647a9b0
MKL		 299 return &rt->rt6i_dst.addr;
300 else
301 return daddr;
9bb5a148
YH		 302}
303
8d1c802b 304static inline bool rt6_duplicate_nexthop(struct fib6_info *a, struct fib6_info *b)
f06b7549 305{
f88d8ea6
DA		 306 struct fib6_nh *nha, *nhb;
307
308 if (a->nh || b->nh)
309 return nexthop_cmp(a->nh, b->nh);
ad1601ae 310
f88d8ea6
DA		 311 nha = a->fib6_nh;
312 nhb = b->fib6_nh;
ad1601ae
DA		 313 return nha->fib_nh_dev == nhb->fib_nh_dev &&
314 ipv6_addr_equal(&nha->fib_nh_gw6, &nhb->fib_nh_gw6) &&
315 !lwtunnel_cmp_encap(nha->fib_nh_lws, nhb->fib_nh_lws);
f06b7549 316}
5e5d6fed 317
427faee1
VF		 318static inline unsigned int ip6_dst_mtu_maybe_forward(const struct dst_entry *dst,
319 bool forwarding)
07cb9623
FF		 320{
321 struct inet6_dev *idev;
322 unsigned int mtu;
323
427faee1 324 if (!forwarding || dst_metric_locked(dst, RTAX_MTU)) {
07cb9623
FF		 325 mtu = dst_metric_raw(dst, RTAX_MTU);
326 if (mtu)
fade5641 327 goto out;
07cb9623
FF		 328 }
329
330 mtu = IPV6_MIN_MTU;
331 rcu_read_lock();
332 idev = __in6_dev_get(dst->dev);
333 if (idev)
334 mtu = idev->cnf.mtu6;
335 rcu_read_unlock();
336
fade5641
VF		 337out:
338 return mtu - lwtunnel_headroom(dst->lwtstate, mtu);
07cb9623
FF		 339}
340
b748f260
DA		 341u32 ip6_mtu_from_fib6(const struct fib6_result *res,
342 const struct in6_addr *daddr,
343 const struct in6_addr *saddr);
901731b8 344
f8a1b43b
DA		 345struct neighbour *ip6_neigh_lookup(const struct in6_addr *gw,
346 struct net_device *dev, struct sk_buff *skb,
347 const void *daddr);
1da177e4 348#endif
Linux 6.x block layer and io_uring tree(s)