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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 | ||
70ceb4f5 YH |
5 | struct route_info { |
6 | __u8 type; | |
7 | __u8 length; | |
8 | __u8 prefix_len; | |
9 | #if defined(__BIG_ENDIAN_BITFIELD) | |
10 | __u8 reserved_h:3, | |
11 | route_pref:2, | |
12 | reserved_l:3; | |
13 | #elif defined(__LITTLE_ENDIAN_BITFIELD) | |
14 | __u8 reserved_l:3, | |
15 | route_pref:2, | |
16 | reserved_h:3; | |
17 | #endif | |
e69a4adc | 18 | __be32 lifetime; |
70ceb4f5 YH |
19 | __u8 prefix[0]; /* 0,8 or 16 */ |
20 | }; | |
21 | ||
a2e2ff56 | 22 | #include <net/addrconf.h> |
1da177e4 LT |
23 | #include <net/flow.h> |
24 | #include <net/ip6_fib.h> | |
25 | #include <net/sock.h> | |
f06b7549 | 26 | #include <net/lwtunnel.h> |
1da177e4 LT |
27 | #include <linux/ip.h> |
28 | #include <linux/ipv6.h> | |
9bb5a148 | 29 | #include <linux/route.h> |
1da177e4 | 30 | |
7cbca67c YH |
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 | |
d5d32e4b | 37 | #define RT6_LOOKUP_F_IGNORE_LINKSTATE 0x00000040 |
77d16f45 | 38 | |
30f78d8e ED |
39 | /* We do not (yet ?) support IPv6 jumbograms (RFC 2675) |
40 | * Unlike IPv4, hdr->seg_len doesn't include the IPv6 header | |
41 | */ | |
42 | #define IP6_MAX_MTU (0xFFFF + sizeof(struct ipv6hdr)) | |
43 | ||
0c9a2ac1 YH |
44 | /* |
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. | |
51 | */ | |
52 | static inline int rt6_srcprefs2flags(unsigned int srcprefs) | |
53 | { | |
54 | /* No need to bitmask because srcprefs have only 3 bits. */ | |
55 | return srcprefs << 3; | |
56 | } | |
57 | ||
58 | static inline unsigned int rt6_flags2srcprefs(int flags) | |
59 | { | |
60 | return (flags >> 3) & 7; | |
61 | } | |
1da177e4 | 62 | |
60ea37f7 WY |
63 | static inline bool rt6_need_strict(const struct in6_addr *daddr) |
64 | { | |
65 | return ipv6_addr_type(daddr) & | |
66 | (IPV6_ADDR_MULTICAST | IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); | |
67 | } | |
fbfe95a4 | 68 | |
33bd5ac5 DA |
69 | static inline bool rt6_qualify_for_ecmp(const struct fib6_info *f6i) |
70 | { | |
be659b8d DA |
71 | /* the RTF_ADDRCONF flag filters out RA's */ |
72 | return !(f6i->fib6_flags & RTF_ADDRCONF) && | |
73 | f6i->fib6_nh.fib_nh_gw_family; | |
33bd5ac5 DA |
74 | } |
75 | ||
5c3a0fd7 | 76 | void ip6_route_input(struct sk_buff *skb); |
d409b847 MB |
77 | struct dst_entry *ip6_route_input_lookup(struct net *net, |
78 | struct net_device *dev, | |
b75cc8f9 DA |
79 | struct flowi6 *fl6, |
80 | const struct sk_buff *skb, int flags); | |
1da177e4 | 81 | |
6f21c96a PA |
82 | struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk, |
83 | struct flowi6 *fl6, int flags); | |
84 | ||
85 | static inline struct dst_entry *ip6_route_output(struct net *net, | |
86 | const struct sock *sk, | |
87 | struct flowi6 *fl6) | |
88 | { | |
89 | return ip6_route_output_flags(net, sk, fl6, 0); | |
90 | } | |
91 | ||
5c3a0fd7 | 92 | struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6, |
b75cc8f9 | 93 | const struct sk_buff *skb, int flags); |
9ff74384 | 94 | struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table, |
b75cc8f9 DA |
95 | int ifindex, struct flowi6 *fl6, |
96 | const struct sk_buff *skb, int flags); | |
1da177e4 | 97 | |
2f460933 | 98 | void ip6_route_init_special_entries(void); |
5c3a0fd7 JP |
99 | int ip6_route_init(void); |
100 | void ip6_route_cleanup(void); | |
1da177e4 | 101 | |
5c3a0fd7 | 102 | int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg); |
1da177e4 | 103 | |
acb54e3c DA |
104 | int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags, |
105 | struct netlink_ext_ack *extack); | |
93c2fb25 DA |
106 | int ip6_ins_rt(struct net *net, struct fib6_info *f6i); |
107 | int ip6_del_rt(struct net *net, struct fib6_info *f6i); | |
1da177e4 | 108 | |
93c2fb25 DA |
109 | void rt6_flush_exceptions(struct fib6_info *f6i); |
110 | void rt6_age_exceptions(struct fib6_info *f6i, struct fib6_gc_args *gc_args, | |
c757faa8 | 111 | unsigned long now); |
35732d01 | 112 | |
93c2fb25 | 113 | static inline int ip6_route_get_saddr(struct net *net, struct fib6_info *f6i, |
a2e2ff56 DA |
114 | const struct in6_addr *daddr, |
115 | unsigned int prefs, | |
116 | struct in6_addr *saddr) | |
117 | { | |
a2e2ff56 DA |
118 | int err = 0; |
119 | ||
6fe74941 | 120 | if (f6i && f6i->fib6_prefsrc.plen) { |
93c2fb25 | 121 | *saddr = f6i->fib6_prefsrc.addr; |
6fe74941 DA |
122 | } else { |
123 | struct net_device *dev = f6i ? fib6_info_nh_dev(f6i) : NULL; | |
124 | ||
125 | err = ipv6_dev_get_saddr(net, dev, daddr, prefs, saddr); | |
126 | } | |
a2e2ff56 DA |
127 | |
128 | return err; | |
129 | } | |
c3968a85 | 130 | |
5c3a0fd7 | 131 | struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, |
b75cc8f9 DA |
132 | const struct in6_addr *saddr, int oif, |
133 | const struct sk_buff *skb, int flags); | |
b4bac172 DA |
134 | u32 rt6_multipath_hash(const struct net *net, const struct flowi6 *fl6, |
135 | const struct sk_buff *skb, struct flow_keys *hkeys); | |
1da177e4 | 136 | |
5c3a0fd7 | 137 | struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6); |
3b00944c | 138 | |
5c3a0fd7 | 139 | void fib6_force_start_gc(struct net *net); |
1da177e4 | 140 | |
360a9887 | 141 | struct fib6_info *addrconf_f6i_alloc(struct net *net, struct inet6_dev *idev, |
8d1c802b DA |
142 | const struct in6_addr *addr, bool anycast, |
143 | gfp_t gfp_flags); | |
1da177e4 | 144 | |
9ab179d8 DA |
145 | struct rt6_info *ip6_dst_alloc(struct net *net, struct net_device *dev, |
146 | int flags); | |
147 | ||
1da177e4 LT |
148 | /* |
149 | * support functions for ND | |
150 | * | |
151 | */ | |
8d1c802b | 152 | struct fib6_info *rt6_get_dflt_router(struct net *net, |
afb1d4b5 | 153 | const struct in6_addr *addr, |
5c3a0fd7 | 154 | struct net_device *dev); |
8d1c802b | 155 | struct fib6_info *rt6_add_dflt_router(struct net *net, |
afb1d4b5 | 156 | const struct in6_addr *gwaddr, |
5c3a0fd7 JP |
157 | struct net_device *dev, unsigned int pref); |
158 | ||
159 | void rt6_purge_dflt_routers(struct net *net); | |
160 | ||
161 | int rt6_route_rcv(struct net_device *dev, u8 *opt, int len, | |
162 | const struct in6_addr *gwaddr); | |
163 | ||
164 | void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu, int oif, | |
e2d118a1 | 165 | u32 mark, kuid_t uid); |
5c3a0fd7 | 166 | void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu); |
e2d118a1 LC |
167 | void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark, |
168 | kuid_t uid); | |
d456336d | 169 | void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif); |
5c3a0fd7 | 170 | void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk); |
1da177e4 | 171 | |
1da177e4 | 172 | struct netlink_callback; |
1da177e4 | 173 | |
fd2c3ef7 | 174 | struct rt6_rtnl_dump_arg { |
1b43af54 PM |
175 | struct sk_buff *skb; |
176 | struct netlink_callback *cb; | |
191cd582 | 177 | struct net *net; |
4724676d | 178 | struct fib_dump_filter filter; |
1b43af54 PM |
179 | }; |
180 | ||
93c2fb25 | 181 | int rt6_dump_route(struct fib6_info *f6i, void *p_arg); |
5c3a0fd7 JP |
182 | void rt6_mtu_change(struct net_device *dev, unsigned int mtu); |
183 | void rt6_remove_prefsrc(struct inet6_ifaddr *ifp); | |
be7a010d | 184 | void rt6_clean_tohost(struct net *net, struct in6_addr *gateway); |
ecc5663c | 185 | void rt6_sync_up(struct net_device *dev, unsigned char nh_flags); |
4c981e28 | 186 | void rt6_disable_ip(struct net_device *dev, unsigned long event); |
27c6fa73 | 187 | void rt6_sync_down_dev(struct net_device *dev, unsigned long event); |
93c2fb25 | 188 | void rt6_multipath_rebalance(struct fib6_info *f6i); |
1da177e4 | 189 | |
510c321b XL |
190 | void rt6_uncached_list_add(struct rt6_info *rt); |
191 | void rt6_uncached_list_del(struct rt6_info *rt); | |
192 | ||
1b70d792 DA |
193 | static inline const struct rt6_info *skb_rt6_info(const struct sk_buff *skb) |
194 | { | |
195 | const struct dst_entry *dst = skb_dst(skb); | |
196 | const struct rt6_info *rt6 = NULL; | |
197 | ||
198 | if (dst) | |
199 | rt6 = container_of(dst, struct rt6_info, dst); | |
200 | ||
201 | return rt6; | |
202 | } | |
1da177e4 LT |
203 | |
204 | /* | |
205 | * Store a destination cache entry in a socket | |
206 | */ | |
6bd4f355 ED |
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) | |
1da177e4 LT |
210 | { |
211 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1da177e4 | 212 | |
6bd4f355 | 213 | np->dst_cookie = rt6_get_cookie((struct rt6_info *)dst); |
f83ef8c0 | 214 | sk_setup_caps(sk, dst); |
1da177e4 | 215 | np->daddr_cache = daddr; |
8e1ef0a9 YH |
216 | #ifdef CONFIG_IPV6_SUBTREES |
217 | np->saddr_cache = saddr; | |
218 | #endif | |
1da177e4 LT |
219 | } |
220 | ||
7d6850f7 AK |
221 | void ip6_sk_dst_store_flow(struct sock *sk, struct dst_entry *dst, |
222 | const struct flowi6 *fl6); | |
223 | ||
a50feda5 | 224 | static inline bool ipv6_unicast_destination(const struct sk_buff *skb) |
1da177e4 | 225 | { |
adf30907 | 226 | struct rt6_info *rt = (struct rt6_info *) skb_dst(skb); |
1da177e4 LT |
227 | |
228 | return rt->rt6i_flags & RTF_LOCAL; | |
229 | } | |
230 | ||
2647a9b0 MKL |
231 | static inline bool ipv6_anycast_destination(const struct dst_entry *dst, |
232 | const struct in6_addr *daddr) | |
509aba3b | 233 | { |
2647a9b0 | 234 | struct rt6_info *rt = (struct rt6_info *)dst; |
509aba3b | 235 | |
2647a9b0 | 236 | return rt->rt6i_flags & RTF_ANYCAST || |
ccdb2d17 | 237 | (rt->rt6i_dst.plen < 127 && |
2647a9b0 | 238 | ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)); |
509aba3b FLB |
239 | } |
240 | ||
7d8c6e39 EB |
241 | int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, |
242 | int (*output)(struct net *, struct sock *, struct sk_buff *)); | |
ad0081e4 DS |
243 | |
244 | static inline int ip6_skb_dst_mtu(struct sk_buff *skb) | |
245 | { | |
f60e5990 | 246 | struct ipv6_pinfo *np = skb->sk && !dev_recursion_level() ? |
247 | inet6_sk(skb->sk) : NULL; | |
ad0081e4 | 248 | |
93b36cf3 | 249 | return (np && np->pmtudisc >= IPV6_PMTUDISC_PROBE) ? |
ad0081e4 DS |
250 | skb_dst(skb)->dev->mtu : dst_mtu(skb_dst(skb)); |
251 | } | |
252 | ||
93b36cf3 HFS |
253 | static inline bool ip6_sk_accept_pmtu(const struct sock *sk) |
254 | { | |
0b95227a HFS |
255 | return inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_INTERFACE && |
256 | inet6_sk(sk)->pmtudisc != IPV6_PMTUDISC_OMIT; | |
257 | } | |
258 | ||
60ff7467 | 259 | static inline bool ip6_sk_ignore_df(const struct sock *sk) |
0b95227a HFS |
260 | { |
261 | return inet6_sk(sk)->pmtudisc < IPV6_PMTUDISC_DO || | |
262 | inet6_sk(sk)->pmtudisc == IPV6_PMTUDISC_OMIT; | |
93b36cf3 HFS |
263 | } |
264 | ||
2647a9b0 MKL |
265 | static inline struct in6_addr *rt6_nexthop(struct rt6_info *rt, |
266 | struct in6_addr *daddr) | |
9bb5a148 | 267 | { |
2647a9b0 MKL |
268 | if (rt->rt6i_flags & RTF_GATEWAY) |
269 | return &rt->rt6i_gateway; | |
45e4fd26 | 270 | else if (unlikely(rt->rt6i_flags & RTF_CACHE)) |
2647a9b0 MKL |
271 | return &rt->rt6i_dst.addr; |
272 | else | |
273 | return daddr; | |
9bb5a148 YH |
274 | } |
275 | ||
8d1c802b | 276 | static inline bool rt6_duplicate_nexthop(struct fib6_info *a, struct fib6_info *b) |
f06b7549 | 277 | { |
ad1601ae DA |
278 | struct fib6_nh *nha = &a->fib6_nh, *nhb = &b->fib6_nh; |
279 | ||
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); | |
f06b7549 | 283 | } |
5e5d6fed | 284 | |
07cb9623 FF |
285 | static inline unsigned int ip6_dst_mtu_forward(const struct dst_entry *dst) |
286 | { | |
287 | struct inet6_dev *idev; | |
288 | unsigned int mtu; | |
289 | ||
290 | if (dst_metric_locked(dst, RTAX_MTU)) { | |
291 | mtu = dst_metric_raw(dst, RTAX_MTU); | |
292 | if (mtu) | |
293 | return mtu; | |
294 | } | |
295 | ||
296 | mtu = IPV6_MIN_MTU; | |
297 | rcu_read_lock(); | |
298 | idev = __in6_dev_get(dst->dev); | |
299 | if (idev) | |
300 | mtu = idev->cnf.mtu6; | |
301 | rcu_read_unlock(); | |
302 | ||
303 | return mtu; | |
304 | } | |
305 | ||
b748f260 DA |
306 | u32 ip6_mtu_from_fib6(const struct fib6_result *res, |
307 | const struct in6_addr *daddr, | |
308 | const struct in6_addr *saddr); | |
901731b8 | 309 | |
f8a1b43b DA |
310 | struct neighbour *ip6_neigh_lookup(const struct in6_addr *gw, |
311 | struct net_device *dev, struct sk_buff *skb, | |
312 | const void *daddr); | |
1da177e4 | 313 | #endif |