Commit | Line | Data |
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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 |
15 | struct 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 | */ | |
54 | static inline int rt6_srcprefs2flags(unsigned int srcprefs) | |
55 | { | |
56 | /* No need to bitmask because srcprefs have only 3 bits. */ | |
57 | return srcprefs << 3; | |
58 | } | |
59 | ||
60 | static inline unsigned int rt6_flags2srcprefs(int flags) | |
61 | { | |
62 | return (flags >> 3) & 7; | |
63 | } | |
1da177e4 | 64 | |
60ea37f7 WY |
65 | static inline bool rt6_need_strict(const struct in6_addr *daddr) |
66 | { | |
67 | return ipv6_addr_type(daddr) & | |
68 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); | |
69 | } | |
fbfe95a4 | 70 | |
f88d8ea6 DA |
71 | /* fib entries using a nexthop object can not be coalesced into |
72 | * a multipath route | |
73 | */ | |
33bd5ac5 DA |
74 | static inline bool rt6_qualify_for_ecmp(const struct fib6_info *f6i) |
75 | { | |
be659b8d | 76 | /* the RTF_ADDRCONF flag filters out RA's */ |
f88d8ea6 | 77 | return !(f6i->fib6_flags & RTF_ADDRCONF) && !f6i->nh && |
1cf844c7 | 78 | f6i->fib6_nh->fib_nh_gw_family; |
33bd5ac5 DA |
79 | } |
80 | ||
5c3a0fd7 | 81 | void ip6_route_input(struct sk_buff *skb); |
d409b847 MB |
82 | struct dst_entry *ip6_route_input_lookup(struct net *net, |
83 | struct net_device *dev, | |
b75cc8f9 DA |
84 | struct flowi6 *fl6, |
85 | const struct sk_buff *skb, int flags); | |
1da177e4 | 86 | |
6f21c96a PA |
87 | struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk, |
88 | struct flowi6 *fl6, int flags); | |
89 | ||
90 | static inline struct dst_entry *ip6_route_output(struct net *net, | |
91 | const struct sock *sk, | |
92 | struct flowi6 *fl6) | |
93 | { | |
94 | return ip6_route_output_flags(net, sk, fl6, 0); | |
95 | } | |
96 | ||
d64a1f57 WW |
97 | /* Only conditionally release dst if flags indicates |
98 | * !RT6_LOOKUP_F_DST_NOREF or dst is in uncached_list. | |
99 | */ | |
100 | static inline void ip6_rt_put_flags(struct rt6_info *rt, int flags) | |
101 | { | |
102 | if (!(flags & RT6_LOOKUP_F_DST_NOREF) || | |
d288a162 | 103 | !list_empty(&rt->dst.rt_uncached)) |
d64a1f57 WW |
104 | ip6_rt_put(rt); |
105 | } | |
106 | ||
5c3a0fd7 | 107 | struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
b75cc8f9 | 108 | const struct sk_buff *skb, int flags); |
9ff74384 | 109 | struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, |
b75cc8f9 DA |
110 | int ifindex, struct flowi6 *fl6, |
111 | const struct sk_buff *skb, int flags); | |
1da177e4 | 112 | |
2f460933 | 113 | void ip6_route_init_special_entries(void); |
5c3a0fd7 JP |
114 | int ip6_route_init(void); |
115 | void ip6_route_cleanup(void); | |
1da177e4 | 116 | |
7c1552da CH |
117 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, |
118 | struct in6_rtmsg *rtmsg); | |
1da177e4 | 119 | |
acb54e3c DA |
120 | int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags, |
121 | struct netlink_ext_ack *extack); | |
93c2fb25 | 122 | int ip6_ins_rt(struct net *net, struct fib6_info *f6i); |
11dd74b3 | 123 | int ip6_del_rt(struct net *net, struct fib6_info *f6i, bool skip_notify); |
1da177e4 | 124 | |
93c2fb25 DA |
125 | void rt6_flush_exceptions(struct fib6_info *f6i); |
126 | void rt6_age_exceptions(struct fib6_info *f6i, struct fib6_gc_args *gc_args, | |
c757faa8 | 127 | unsigned long now); |
35732d01 | 128 | |
93c2fb25 | 129 | static inline int ip6_route_get_saddr(struct net *net, struct fib6_info *f6i, |
a2e2ff56 DA |
130 | const struct in6_addr *daddr, |
131 | unsigned int prefs, | |
132 | struct in6_addr *saddr) | |
133 | { | |
a2e2ff56 DA |
134 | int err = 0; |
135 | ||
6fe74941 | 136 | if (f6i && f6i->fib6_prefsrc.plen) { |
93c2fb25 | 137 | *saddr = f6i->fib6_prefsrc.addr; |
6fe74941 DA |
138 | } else { |
139 | struct net_device *dev = f6i ? fib6_info_nh_dev(f6i) : NULL; | |
140 | ||
141 | err = ipv6_dev_get_saddr(net, dev, daddr, prefs, saddr); | |
142 | } | |
a2e2ff56 DA |
143 | |
144 | return err; | |
145 | } | |
c3968a85 | 146 | |
5c3a0fd7 | 147 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
b75cc8f9 DA |
148 | const struct in6_addr *saddr, int oif, |
149 | const struct sk_buff *skb, int flags); | |
b4bac172 DA |
150 | u32 rt6_multipath_hash(const struct net *net, const struct flowi6 *fl6, |
151 | const struct sk_buff *skb, struct flow_keys *hkeys); | |
1da177e4 | 152 | |
5c3a0fd7 | 153 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6); |
3b00944c | 154 | |
5c3a0fd7 | 155 | void fib6_force_start_gc(struct net *net); |
1da177e4 | 156 | |
360a9887 | 157 | struct fib6_info *addrconf_f6i_alloc(struct net *net, struct inet6_dev *idev, |
8d1c802b DA |
158 | const struct in6_addr *addr, bool anycast, |
159 | gfp_t gfp_flags); | |
1da177e4 | 160 | |
9ab179d8 DA |
161 | struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev, |
162 | int flags); | |
163 | ||
1da177e4 LT |
164 | /* |
165 | * support functions for ND | |
166 | * | |
167 | */ | |
8d1c802b | 168 | struct fib6_info *rt6_get_dflt_router(struct net *net, |
afb1d4b5 | 169 | const struct in6_addr *addr, |
5c3a0fd7 | 170 | struct net_device *dev); |
8d1c802b | 171 | struct fib6_info *rt6_add_dflt_router(struct net *net, |
afb1d4b5 | 172 | const struct in6_addr *gwaddr, |
6b2e04bc PC |
173 | struct net_device *dev, unsigned int pref, |
174 | u32 defrtr_usr_metric); | |
5c3a0fd7 JP |
175 | |
176 | void rt6_purge_dflt_routers(struct net *net); | |
177 | ||
178 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
179 | const struct in6_addr *gwaddr); | |
180 | ||
181 | void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif, | |
e2d118a1 | 182 | u32 mark, kuid_t uid); |
5c3a0fd7 | 183 | void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu); |
e2d118a1 LC |
184 | void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark, |
185 | kuid_t uid); | |
d456336d | 186 | void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif); |
5c3a0fd7 | 187 | void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk); |
1da177e4 | 188 | |
1da177e4 | 189 | struct netlink_callback; |
1da177e4 | 190 | |
fd2c3ef7 | 191 | struct rt6_rtnl_dump_arg { |
1b43af54 PM |
192 | struct sk_buff *skb; |
193 | struct netlink_callback *cb; | |
191cd582 | 194 | struct net *net; |
4724676d | 195 | struct fib_dump_filter filter; |
1b43af54 PM |
196 | }; |
197 | ||
1e47b483 | 198 | int rt6_dump_route(struct fib6_info *f6i, void *p_arg, unsigned int skip); |
5c3a0fd7 JP |
199 | void rt6_mtu_change(struct net_device *dev, unsigned int mtu); |
200 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp); | |
be7a010d | 201 | void rt6_clean_tohost(struct net *net, struct in6_addr *gateway); |
ecc5663c | 202 | void rt6_sync_up(struct net_device *dev, unsigned char nh_flags); |
4c981e28 | 203 | void rt6_disable_ip(struct net_device *dev, unsigned long event); |
27c6fa73 | 204 | void rt6_sync_down_dev(struct net_device *dev, unsigned long event); |
93c2fb25 | 205 | void rt6_multipath_rebalance(struct fib6_info *f6i); |
1da177e4 | 206 | |
510c321b XL |
207 | void rt6_uncached_list_add(struct rt6_info *rt); |
208 | void rt6_uncached_list_del(struct rt6_info *rt); | |
209 | ||
1b70d792 DA |
210 | static inline const struct rt6_info *skb_rt6_info(const struct sk_buff *skb) |
211 | { | |
212 | const struct dst_entry *dst = skb_dst(skb); | |
213 | const struct rt6_info *rt6 = NULL; | |
214 | ||
215 | if (dst) | |
216 | rt6 = container_of(dst, struct rt6_info, dst); | |
217 | ||
218 | return rt6; | |
219 | } | |
1da177e4 LT |
220 | |
221 | /* | |
222 | * Store a destination cache entry in a socket | |
223 | */ | |
6bd4f355 ED |
224 | static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst, |
225 | const struct in6_addr *daddr, | |
226 | const struct in6_addr *saddr) | |
1da177e4 LT |
227 | { |
228 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1da177e4 | 229 | |
6bd4f355 | 230 | np->dst_cookie = rt6_get_cookie((struct rt6_info *)dst); |
f83ef8c0 | 231 | sk_setup_caps(sk, dst); |
1da177e4 | 232 | np->daddr_cache = daddr; |
8e1ef0a9 YH |
233 | #ifdef CONFIG_IPV6_SUBTREES |
234 | np->saddr_cache = saddr; | |
235 | #endif | |
1da177e4 LT |
236 | } |
237 | ||
7d6850f7 AK |
238 | void ip6_sk_dst_store_flow(struct sock *sk, struct dst_entry *dst, |
239 | const struct flowi6 *fl6); | |
240 | ||
a50feda5 | 241 | static inline bool ipv6_unicast_destination(const struct sk_buff *skb) |
1da177e4 | 242 | { |
adf30907 | 243 | struct rt6_info *rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 LT |
244 | |
245 | return rt->rt6i_flags & RTF_LOCAL; | |
246 | } | |
247 | ||
2647a9b0 MKL |
248 | static inline bool ipv6_anycast_destination(const struct dst_entry *dst, |
249 | const struct in6_addr *daddr) | |
509aba3b | 250 | { |
2647a9b0 | 251 | struct rt6_info *rt = (struct rt6_info *)dst; |
509aba3b | 252 | |
2647a9b0 | 253 | return rt->rt6i_flags & RTF_ANYCAST || |
ccdb2d17 | 254 | (rt->rt6i_dst.plen < 127 && |
03e2a984 | 255 | !(rt->rt6i_flags & (RTF_GATEWAY | RTF_NONEXTHOP)) && |
2647a9b0 | 256 | ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)); |
509aba3b FLB |
257 | } |
258 | ||
7d8c6e39 EB |
259 | int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, |
260 | int (*output)(struct net *, struct sock *, struct sk_buff *)); | |
ad0081e4 | 261 | |
8d22679d | 262 | static inline unsigned int ip6_skb_dst_mtu(const struct sk_buff *skb) |
ad0081e4 | 263 | { |
8d22679d | 264 | const struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ? |
f60e5990 | 265 | inet6_sk(skb->sk) : NULL; |
8d22679d ED |
266 | const struct dst_entry *dst = skb_dst(skb); |
267 | unsigned int mtu; | |
ad0081e4 | 268 | |
fade5641 | 269 | if (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) { |
8d22679d ED |
270 | mtu = READ_ONCE(dst->dev->mtu); |
271 | mtu -= lwtunnel_headroom(dst->lwtstate, mtu); | |
272 | } else { | |
273 | mtu = dst_mtu(dst); | |
274 | } | |
fade5641 | 275 | return mtu; |
ad0081e4 DS |
276 | } |
277 | ||
93b36cf3 HFS |
278 | static inline bool ip6_sk_accept_pmtu(const struct sock *sk) |
279 | { | |
0b95227a HFS |
280 | return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE && |
281 | inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT; | |
282 | } | |
283 | ||
60ff7467 | 284 | static inline bool ip6_sk_ignore_df(const struct sock *sk) |
0b95227a HFS |
285 | { |
286 | return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO || | |
287 | inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT; | |
93b36cf3 HFS |
288 | } |
289 | ||
9b1c1ef1 ND |
290 | static inline const struct in6_addr *rt6_nexthop(const struct rt6_info *rt, |
291 | const struct in6_addr *daddr) | |
9bb5a148 | 292 | { |
2647a9b0 MKL |
293 | if (rt->rt6i_flags & RTF_GATEWAY) |
294 | return &rt->rt6i_gateway; | |
45e4fd26 | 295 | else if (unlikely(rt->rt6i_flags & RTF_CACHE)) |
2647a9b0 MKL |
296 | return &rt->rt6i_dst.addr; |
297 | else | |
298 | return daddr; | |
9bb5a148 YH |
299 | } |
300 | ||
8d1c802b | 301 | static inline bool rt6_duplicate_nexthop(struct fib6_info *a, struct fib6_info *b) |
f06b7549 | 302 | { |
f88d8ea6 DA |
303 | struct fib6_nh *nha, *nhb; |
304 | ||
305 | if (a->nh || b->nh) | |
306 | return nexthop_cmp(a->nh, b->nh); | |
ad1601ae | 307 | |
f88d8ea6 DA |
308 | nha = a->fib6_nh; |
309 | nhb = b->fib6_nh; | |
ad1601ae DA |
310 | return nha->fib_nh_dev == nhb->fib_nh_dev && |
311 | ipv6_addr_equal(&nha->fib_nh_gw6, &nhb->fib_nh_gw6) && | |
312 | !lwtunnel_cmp_encap(nha->fib_nh_lws, nhb->fib_nh_lws); | |
f06b7549 | 313 | } |
5e5d6fed | 314 | |
427faee1 VF |
315 | static inline unsigned int ip6_dst_mtu_maybe_forward(const struct dst_entry *dst, |
316 | bool forwarding) | |
07cb9623 FF |
317 | { |
318 | struct inet6_dev *idev; | |
319 | unsigned int mtu; | |
320 | ||
427faee1 | 321 | if (!forwarding || dst_metric_locked(dst, RTAX_MTU)) { |
07cb9623 FF |
322 | mtu = dst_metric_raw(dst, RTAX_MTU); |
323 | if (mtu) | |
fade5641 | 324 | goto out; |
07cb9623 FF |
325 | } |
326 | ||
327 | mtu = IPV6_MIN_MTU; | |
328 | rcu_read_lock(); | |
329 | idev = __in6_dev_get(dst->dev); | |
330 | if (idev) | |
331 | mtu = idev->cnf.mtu6; | |
332 | rcu_read_unlock(); | |
333 | ||
fade5641 VF |
334 | out: |
335 | return mtu - lwtunnel_headroom(dst->lwtstate, mtu); | |
07cb9623 FF |
336 | } |
337 | ||
b748f260 DA |
338 | u32 ip6_mtu_from_fib6(const struct fib6_result *res, |
339 | const struct in6_addr *daddr, | |
340 | const struct in6_addr *saddr); | |
901731b8 | 341 | |
f8a1b43b DA |
342 | struct neighbour *ip6_neigh_lookup(const struct in6_addr *gw, |
343 | struct net_device *dev, struct sk_buff *skb, | |
344 | const void *daddr); | |
1da177e4 | 345 | #endif |