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 | static inline unsigned int ipv6_addr_scope2type(unsigned int scope) |
23 | { |
24 | switch (scope) { |
25 | case IPV6_ADDR_SCOPE_NODELOCAL: |
26 | return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) | |
27 | IPV6_ADDR_LOOPBACK); |
28 | case IPV6_ADDR_SCOPE_LINKLOCAL: |
29 | return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) | |
30 | IPV6_ADDR_LINKLOCAL); |
31 | case IPV6_ADDR_SCOPE_SITELOCAL: |
32 | return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) | |
33 | IPV6_ADDR_SITELOCAL); |
34 | } |
35 | return IPV6_ADDR_SCOPE_TYPE(scope); |
36 | } |
37 | |
38 | int __ipv6_addr_type(const struct in6_addr *addr) |
39 | { |
40 | __be32 st; |
41 | |
42 | 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 | 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 | if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) { |
53 | /* multicast */ |
54 | /* addr-select 3.1 */ |
55 | return (IPV6_ADDR_MULTICAST | |
56 | ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr))); |
57 | } |
58 | |
59 | 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 | 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 | if ((st & htonl(0xFE000000)) == htonl(0xFC000000)) |
66 | return (IPV6_ADDR_UNICAST | |
67 | IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* RFC 4193 */ |
68 | |
69 | if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) { |
70 | if (addr->s6_addr32[2] == 0) { |
71 | if (addr->s6_addr32[3] == 0) |
72 | return IPV6_ADDR_ANY; |
73 | |
74 | 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 | return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST | |
79 | IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */ |
80 | } |
81 | |
82 | if (addr->s6_addr32[2] == htonl(0x0000ffff)) |
83 | 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 | int register_inet6addr_notifier(struct notifier_block *nb) |
96 | { |
97 | return atomic_notifier_chain_register(nh: &inet6addr_chain, nb); |
98 | } |
99 | EXPORT_SYMBOL(register_inet6addr_notifier); |
100 | |
101 | int unregister_inet6addr_notifier(struct notifier_block *nb) |
102 | { |
103 | return atomic_notifier_chain_unregister(nh: &inet6addr_chain, nb); |
104 | } |
105 | EXPORT_SYMBOL(unregister_inet6addr_notifier); |
106 | |
107 | int inet6addr_notifier_call_chain(unsigned long val, void *v) |
108 | { |
109 | return atomic_notifier_call_chain(nh: &inet6addr_chain, val, v); |
110 | } |
111 | EXPORT_SYMBOL(inet6addr_notifier_call_chain); |
112 | |
113 | int register_inet6addr_validator_notifier(struct notifier_block *nb) |
114 | { |
115 | return blocking_notifier_chain_register(nh: &inet6addr_validator_chain, nb); |
116 | } |
117 | EXPORT_SYMBOL(register_inet6addr_validator_notifier); |
118 | |
119 | int unregister_inet6addr_validator_notifier(struct notifier_block *nb) |
120 | { |
121 | return blocking_notifier_chain_unregister(nh: &inet6addr_validator_chain, |
122 | nb); |
123 | } |
124 | EXPORT_SYMBOL(unregister_inet6addr_validator_notifier); |
125 | |
126 | int inet6addr_validator_notifier_call_chain(unsigned long val, void *v) |
127 | { |
128 | return blocking_notifier_call_chain(nh: &inet6addr_validator_chain, val, v); |
129 | } |
130 | EXPORT_SYMBOL(inet6addr_validator_notifier_call_chain); |
131 | |
132 | 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 | return ERR_PTR(error: -EAFNOSUPPORT); |
138 | } |
139 | |
140 | static int eafnosupport_ipv6_route_input(struct sk_buff *skb) |
141 | { |
142 | return -EAFNOSUPPORT; |
143 | } |
144 | |
145 | static struct fib6_table *eafnosupport_fib6_get_table(struct net *net, u32 id) |
146 | { |
147 | return NULL; |
148 | } |
149 | |
150 | static int |
151 | 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 | return -EAFNOSUPPORT; |
156 | } |
157 | |
158 | static int |
159 | eafnosupport_fib6_lookup(struct net *net, int oif, struct flowi6 *fl6, |
160 | struct fib6_result *res, int flags) |
161 | { |
162 | return -EAFNOSUPPORT; |
163 | } |
164 | |
165 | static void |
166 | 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 | } |
171 | |
172 | static u32 |
173 | eafnosupport_ip6_mtu_from_fib6(const struct fib6_result *res, |
174 | const struct in6_addr *daddr, |
175 | const struct in6_addr *saddr) |
176 | { |
177 | return 0; |
178 | } |
179 | |
180 | 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 | NL_SET_ERR_MSG(extack, "IPv6 support not enabled in kernel" ); |
185 | return -EAFNOSUPPORT; |
186 | } |
187 | |
188 | static int eafnosupport_ip6_del_rt(struct net *net, struct fib6_info *rt, |
189 | bool skip_notify) |
190 | { |
191 | return -EAFNOSUPPORT; |
192 | } |
193 | |
194 | 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 | kfree_skb(skb); |
198 | return -EAFNOSUPPORT; |
199 | } |
200 | |
201 | static struct net_device *eafnosupport_ipv6_dev_find(struct net *net, const struct in6_addr *addr, |
202 | struct net_device *dev) |
203 | { |
204 | return ERR_PTR(error: -EAFNOSUPPORT); |
205 | } |
206 | |
207 | const struct ipv6_stub *ipv6_stub __read_mostly = &(struct ipv6_stub) { |
208 | .ipv6_dst_lookup_flow = eafnosupport_ipv6_dst_lookup_flow, |
209 | .ipv6_route_input = eafnosupport_ipv6_route_input, |
210 | .fib6_get_table = eafnosupport_fib6_get_table, |
211 | .fib6_table_lookup = eafnosupport_fib6_table_lookup, |
212 | .fib6_lookup = eafnosupport_fib6_lookup, |
213 | .fib6_select_path = eafnosupport_fib6_select_path, |
214 | .ip6_mtu_from_fib6 = eafnosupport_ip6_mtu_from_fib6, |
215 | .fib6_nh_init = eafnosupport_fib6_nh_init, |
216 | .ip6_del_rt = eafnosupport_ip6_del_rt, |
217 | .ipv6_fragment = eafnosupport_ipv6_fragment, |
218 | .ipv6_dev_find = eafnosupport_ipv6_dev_find, |
219 | }; |
220 | EXPORT_SYMBOL_GPL(ipv6_stub); |
221 | |
222 | /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ |
223 | const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; |
224 | EXPORT_SYMBOL(in6addr_loopback); |
225 | const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; |
226 | EXPORT_SYMBOL(in6addr_any); |
227 | const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT; |
228 | EXPORT_SYMBOL(in6addr_linklocal_allnodes); |
229 | const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; |
230 | EXPORT_SYMBOL(in6addr_linklocal_allrouters); |
231 | const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT; |
232 | EXPORT_SYMBOL(in6addr_interfacelocal_allnodes); |
233 | const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT; |
234 | EXPORT_SYMBOL(in6addr_interfacelocal_allrouters); |
235 | const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT; |
236 | EXPORT_SYMBOL(in6addr_sitelocal_allrouters); |
237 | |
238 | static void snmp6_free_dev(struct inet6_dev *idev) |
239 | { |
240 | kfree(objp: idev->stats.icmpv6msgdev); |
241 | kfree(objp: idev->stats.icmpv6dev); |
242 | free_percpu(pdata: idev->stats.ipv6); |
243 | } |
244 | |
245 | static void in6_dev_finish_destroy_rcu(struct rcu_head *head) |
246 | { |
247 | struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu); |
248 | |
249 | snmp6_free_dev(idev); |
250 | kfree(objp: idev); |
251 | } |
252 | |
253 | /* Nobody refers to this device, we may destroy it. */ |
254 | |
255 | void in6_dev_finish_destroy(struct inet6_dev *idev) |
256 | { |
257 | struct net_device *dev = idev->dev; |
258 | |
259 | WARN_ON(!list_empty(&idev->addr_list)); |
260 | WARN_ON(rcu_access_pointer(idev->mc_list)); |
261 | WARN_ON(timer_pending(&idev->rs_timer)); |
262 | |
263 | #ifdef NET_REFCNT_DEBUG |
264 | pr_debug("%s: %s\n" , __func__, dev ? dev->name : "NIL" ); |
265 | #endif |
266 | netdev_put(dev, tracker: &idev->dev_tracker); |
267 | if (!idev->dead) { |
268 | pr_warn("Freeing alive inet6 device %p\n" , idev); |
269 | return; |
270 | } |
271 | call_rcu(head: &idev->rcu, func: in6_dev_finish_destroy_rcu); |
272 | } |
273 | EXPORT_SYMBOL(in6_dev_finish_destroy); |
274 | |