Line data Source code
1 : // SPDX-License-Identifier: GPL-2.0-only
2 : /*
3 : * IPv6 library code, needed by static components when full IPv6 support is
4 : * not configured or static.
5 : */
6 :
7 : #include <linux/export.h>
8 : #include <net/ipv6.h>
9 : #include <net/ipv6_stubs.h>
10 : #include <net/addrconf.h>
11 : #include <net/ip.h>
12 :
13 : /* if ipv6 module registers this function is used by xfrm to force all
14 : * sockets to relookup their nodes - this is fairly expensive, be
15 : * careful
16 : */
17 : void (*__fib6_flush_trees)(struct net *);
18 : EXPORT_SYMBOL(__fib6_flush_trees);
19 :
20 : #define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16)
21 :
22 0 : static inline unsigned int ipv6_addr_scope2type(unsigned int scope)
23 : {
24 0 : switch (scope) {
25 : case IPV6_ADDR_SCOPE_NODELOCAL:
26 : return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
27 : IPV6_ADDR_LOOPBACK);
28 0 : case IPV6_ADDR_SCOPE_LINKLOCAL:
29 0 : return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
30 : IPV6_ADDR_LINKLOCAL);
31 0 : case IPV6_ADDR_SCOPE_SITELOCAL:
32 0 : return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
33 : IPV6_ADDR_SITELOCAL);
34 : }
35 0 : return IPV6_ADDR_SCOPE_TYPE(scope);
36 : }
37 :
38 0 : int __ipv6_addr_type(const struct in6_addr *addr)
39 : {
40 0 : __be32 st;
41 :
42 0 : st = addr->s6_addr32[0];
43 :
44 : /* Consider all addresses with the first three bits different of
45 : 000 and 111 as unicasts.
46 : */
47 0 : if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
48 : (st & htonl(0xE0000000)) != htonl(0xE0000000))
49 : return (IPV6_ADDR_UNICAST |
50 : IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
51 :
52 0 : if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
53 : /* multicast */
54 : /* addr-select 3.1 */
55 0 : return (IPV6_ADDR_MULTICAST |
56 0 : ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
57 : }
58 :
59 0 : if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
60 : return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST |
61 : IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.1 */
62 0 : if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
63 : return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
64 : IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL)); /* addr-select 3.1 */
65 0 : if ((st & htonl(0xFE000000)) == htonl(0xFC000000))
66 : return (IPV6_ADDR_UNICAST |
67 : IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* RFC 4193 */
68 :
69 0 : if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
70 0 : if (addr->s6_addr32[2] == 0) {
71 0 : if (addr->s6_addr32[3] == 0)
72 : return IPV6_ADDR_ANY;
73 :
74 0 : if (addr->s6_addr32[3] == htonl(0x00000001))
75 : return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
76 : IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.4 */
77 :
78 0 : return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
79 : IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
80 : }
81 :
82 0 : if (addr->s6_addr32[2] == htonl(0x0000ffff))
83 0 : return (IPV6_ADDR_MAPPED |
84 : IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
85 : }
86 :
87 : return (IPV6_ADDR_UNICAST |
88 : IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.4 */
89 : }
90 : EXPORT_SYMBOL(__ipv6_addr_type);
91 :
92 : static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
93 : static BLOCKING_NOTIFIER_HEAD(inet6addr_validator_chain);
94 :
95 0 : int register_inet6addr_notifier(struct notifier_block *nb)
96 : {
97 0 : return atomic_notifier_chain_register(&inet6addr_chain, nb);
98 : }
99 : EXPORT_SYMBOL(register_inet6addr_notifier);
100 :
101 0 : int unregister_inet6addr_notifier(struct notifier_block *nb)
102 : {
103 0 : return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
104 : }
105 : EXPORT_SYMBOL(unregister_inet6addr_notifier);
106 :
107 0 : int inet6addr_notifier_call_chain(unsigned long val, void *v)
108 : {
109 0 : return atomic_notifier_call_chain(&inet6addr_chain, val, v);
110 : }
111 : EXPORT_SYMBOL(inet6addr_notifier_call_chain);
112 :
113 0 : int register_inet6addr_validator_notifier(struct notifier_block *nb)
114 : {
115 0 : return blocking_notifier_chain_register(&inet6addr_validator_chain, nb);
116 : }
117 : EXPORT_SYMBOL(register_inet6addr_validator_notifier);
118 :
119 0 : int unregister_inet6addr_validator_notifier(struct notifier_block *nb)
120 : {
121 0 : return blocking_notifier_chain_unregister(&inet6addr_validator_chain,
122 : nb);
123 : }
124 : EXPORT_SYMBOL(unregister_inet6addr_validator_notifier);
125 :
126 0 : int inet6addr_validator_notifier_call_chain(unsigned long val, void *v)
127 : {
128 0 : return blocking_notifier_call_chain(&inet6addr_validator_chain, val, v);
129 : }
130 : EXPORT_SYMBOL(inet6addr_validator_notifier_call_chain);
131 :
132 0 : static struct dst_entry *eafnosupport_ipv6_dst_lookup_flow(struct net *net,
133 : const struct sock *sk,
134 : struct flowi6 *fl6,
135 : const struct in6_addr *final_dst)
136 : {
137 0 : return ERR_PTR(-EAFNOSUPPORT);
138 : }
139 :
140 0 : static int eafnosupport_ipv6_route_input(struct sk_buff *skb)
141 : {
142 0 : return -EAFNOSUPPORT;
143 : }
144 :
145 0 : static struct fib6_table *eafnosupport_fib6_get_table(struct net *net, u32 id)
146 : {
147 0 : return NULL;
148 : }
149 :
150 : static int
151 0 : eafnosupport_fib6_table_lookup(struct net *net, struct fib6_table *table,
152 : int oif, struct flowi6 *fl6,
153 : struct fib6_result *res, int flags)
154 : {
155 0 : return -EAFNOSUPPORT;
156 : }
157 :
158 : static int
159 0 : eafnosupport_fib6_lookup(struct net *net, int oif, struct flowi6 *fl6,
160 : struct fib6_result *res, int flags)
161 : {
162 0 : return -EAFNOSUPPORT;
163 : }
164 :
165 : static void
166 0 : eafnosupport_fib6_select_path(const struct net *net, struct fib6_result *res,
167 : struct flowi6 *fl6, int oif, bool have_oif_match,
168 : const struct sk_buff *skb, int strict)
169 : {
170 0 : }
171 :
172 : static u32
173 0 : eafnosupport_ip6_mtu_from_fib6(const struct fib6_result *res,
174 : const struct in6_addr *daddr,
175 : const struct in6_addr *saddr)
176 : {
177 0 : return 0;
178 : }
179 :
180 0 : static int eafnosupport_fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh,
181 : struct fib6_config *cfg, gfp_t gfp_flags,
182 : struct netlink_ext_ack *extack)
183 : {
184 0 : NL_SET_ERR_MSG(extack, "IPv6 support not enabled in kernel");
185 0 : return -EAFNOSUPPORT;
186 : }
187 :
188 0 : static int eafnosupport_ip6_del_rt(struct net *net, struct fib6_info *rt,
189 : bool skip_notify)
190 : {
191 0 : return -EAFNOSUPPORT;
192 : }
193 :
194 0 : static int eafnosupport_ipv6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
195 : int (*output)(struct net *, struct sock *, struct sk_buff *))
196 : {
197 0 : kfree_skb(skb);
198 0 : return -EAFNOSUPPORT;
199 : }
200 :
201 : const struct ipv6_stub *ipv6_stub __read_mostly = &(struct ipv6_stub) {
202 : .ipv6_dst_lookup_flow = eafnosupport_ipv6_dst_lookup_flow,
203 : .ipv6_route_input = eafnosupport_ipv6_route_input,
204 : .fib6_get_table = eafnosupport_fib6_get_table,
205 : .fib6_table_lookup = eafnosupport_fib6_table_lookup,
206 : .fib6_lookup = eafnosupport_fib6_lookup,
207 : .fib6_select_path = eafnosupport_fib6_select_path,
208 : .ip6_mtu_from_fib6 = eafnosupport_ip6_mtu_from_fib6,
209 : .fib6_nh_init = eafnosupport_fib6_nh_init,
210 : .ip6_del_rt = eafnosupport_ip6_del_rt,
211 : .ipv6_fragment = eafnosupport_ipv6_fragment,
212 : };
213 : EXPORT_SYMBOL_GPL(ipv6_stub);
214 :
215 : /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
216 : const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
217 : EXPORT_SYMBOL(in6addr_loopback);
218 : const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
219 : EXPORT_SYMBOL(in6addr_any);
220 : const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
221 : EXPORT_SYMBOL(in6addr_linklocal_allnodes);
222 : const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
223 : EXPORT_SYMBOL(in6addr_linklocal_allrouters);
224 : const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
225 : EXPORT_SYMBOL(in6addr_interfacelocal_allnodes);
226 : const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
227 : EXPORT_SYMBOL(in6addr_interfacelocal_allrouters);
228 : const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
229 : EXPORT_SYMBOL(in6addr_sitelocal_allrouters);
230 :
231 0 : static void snmp6_free_dev(struct inet6_dev *idev)
232 : {
233 0 : kfree(idev->stats.icmpv6msgdev);
234 0 : kfree(idev->stats.icmpv6dev);
235 0 : free_percpu(idev->stats.ipv6);
236 0 : }
237 :
238 0 : static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
239 : {
240 0 : struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
241 :
242 0 : snmp6_free_dev(idev);
243 0 : kfree(idev);
244 0 : }
245 :
246 : /* Nobody refers to this device, we may destroy it. */
247 :
248 0 : void in6_dev_finish_destroy(struct inet6_dev *idev)
249 : {
250 0 : struct net_device *dev = idev->dev;
251 :
252 0 : WARN_ON(!list_empty(&idev->addr_list));
253 0 : WARN_ON(idev->mc_list);
254 0 : WARN_ON(timer_pending(&idev->rs_timer));
255 :
256 : #ifdef NET_REFCNT_DEBUG
257 : pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
258 : #endif
259 0 : dev_put(dev);
260 0 : if (!idev->dead) {
261 0 : pr_warn("Freeing alive inet6 device %p\n", idev);
262 0 : return;
263 : }
264 0 : call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
265 : }
266 : EXPORT_SYMBOL(in6_dev_finish_destroy);
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