/net/ipv6/addrconf_core.c
C | 257 lines | 202 code | 39 blank | 16 comment | 23 complexity | 37e20ef6e9dafe903a31bdf6a756bdd1 MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * IPv6 library code, needed by static components when full IPv6 support is
- * not configured or static.
- */
- #include <linux/export.h>
- #include <net/ipv6.h>
- #include <net/ipv6_stubs.h>
- #include <net/addrconf.h>
- #include <net/ip.h>
- /* if ipv6 module registers this function is used by xfrm to force all
- * sockets to relookup their nodes - this is fairly expensive, be
- * careful
- */
- void (*__fib6_flush_trees)(struct net *);
- EXPORT_SYMBOL(__fib6_flush_trees);
- #define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16)
- static inline unsigned int ipv6_addr_scope2type(unsigned int scope)
- {
- switch (scope) {
- case IPV6_ADDR_SCOPE_NODELOCAL:
- return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
- IPV6_ADDR_LOOPBACK);
- case IPV6_ADDR_SCOPE_LINKLOCAL:
- return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
- IPV6_ADDR_LINKLOCAL);
- case IPV6_ADDR_SCOPE_SITELOCAL:
- return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
- IPV6_ADDR_SITELOCAL);
- }
- return IPV6_ADDR_SCOPE_TYPE(scope);
- }
- int __ipv6_addr_type(const struct in6_addr *addr)
- {
- __be32 st;
- st = addr->s6_addr32[0];
- /* Consider all addresses with the first three bits different of
- 000 and 111 as unicasts.
- */
- if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
- (st & htonl(0xE0000000)) != htonl(0xE0000000))
- return (IPV6_ADDR_UNICAST |
- IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
- if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
- /* multicast */
- /* addr-select 3.1 */
- return (IPV6_ADDR_MULTICAST |
- ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
- }
- if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
- return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST |
- IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.1 */
- if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
- return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
- IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL)); /* addr-select 3.1 */
- if ((st & htonl(0xFE000000)) == htonl(0xFC000000))
- return (IPV6_ADDR_UNICAST |
- IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* RFC 4193 */
- if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
- if (addr->s6_addr32[2] == 0) {
- if (addr->s6_addr32[3] == 0)
- return IPV6_ADDR_ANY;
- if (addr->s6_addr32[3] == htonl(0x00000001))
- return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
- IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.4 */
- return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
- IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
- }
- if (addr->s6_addr32[2] == htonl(0x0000ffff))
- return (IPV6_ADDR_MAPPED |
- IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
- }
- return (IPV6_ADDR_UNICAST |
- IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.4 */
- }
- EXPORT_SYMBOL(__ipv6_addr_type);
- static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
- static BLOCKING_NOTIFIER_HEAD(inet6addr_validator_chain);
- int register_inet6addr_notifier(struct notifier_block *nb)
- {
- return atomic_notifier_chain_register(&inet6addr_chain, nb);
- }
- EXPORT_SYMBOL(register_inet6addr_notifier);
- int unregister_inet6addr_notifier(struct notifier_block *nb)
- {
- return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
- }
- EXPORT_SYMBOL(unregister_inet6addr_notifier);
- int inet6addr_notifier_call_chain(unsigned long val, void *v)
- {
- return atomic_notifier_call_chain(&inet6addr_chain, val, v);
- }
- EXPORT_SYMBOL(inet6addr_notifier_call_chain);
- int register_inet6addr_validator_notifier(struct notifier_block *nb)
- {
- return blocking_notifier_chain_register(&inet6addr_validator_chain, nb);
- }
- EXPORT_SYMBOL(register_inet6addr_validator_notifier);
- int unregister_inet6addr_validator_notifier(struct notifier_block *nb)
- {
- return blocking_notifier_chain_unregister(&inet6addr_validator_chain,
- nb);
- }
- EXPORT_SYMBOL(unregister_inet6addr_validator_notifier);
- int inet6addr_validator_notifier_call_chain(unsigned long val, void *v)
- {
- return blocking_notifier_call_chain(&inet6addr_validator_chain, val, v);
- }
- EXPORT_SYMBOL(inet6addr_validator_notifier_call_chain);
- static struct dst_entry *eafnosupport_ipv6_dst_lookup_flow(struct net *net,
- const struct sock *sk,
- struct flowi6 *fl6,
- const struct in6_addr *final_dst)
- {
- return ERR_PTR(-EAFNOSUPPORT);
- }
- static int eafnosupport_ipv6_route_input(struct sk_buff *skb)
- {
- return -EAFNOSUPPORT;
- }
- static struct fib6_table *eafnosupport_fib6_get_table(struct net *net, u32 id)
- {
- return NULL;
- }
- static int
- eafnosupport_fib6_table_lookup(struct net *net, struct fib6_table *table,
- int oif, struct flowi6 *fl6,
- struct fib6_result *res, int flags)
- {
- return -EAFNOSUPPORT;
- }
- static int
- eafnosupport_fib6_lookup(struct net *net, int oif, struct flowi6 *fl6,
- struct fib6_result *res, int flags)
- {
- return -EAFNOSUPPORT;
- }
- static void
- eafnosupport_fib6_select_path(const struct net *net, struct fib6_result *res,
- struct flowi6 *fl6, int oif, bool have_oif_match,
- const struct sk_buff *skb, int strict)
- {
- }
- static u32
- eafnosupport_ip6_mtu_from_fib6(const struct fib6_result *res,
- const struct in6_addr *daddr,
- const struct in6_addr *saddr)
- {
- return 0;
- }
- static int eafnosupport_fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh,
- struct fib6_config *cfg, gfp_t gfp_flags,
- struct netlink_ext_ack *extack)
- {
- NL_SET_ERR_MSG(extack, "IPv6 support not enabled in kernel");
- return -EAFNOSUPPORT;
- }
- static int eafnosupport_ip6_del_rt(struct net *net, struct fib6_info *rt)
- {
- return -EAFNOSUPPORT;
- }
- const struct ipv6_stub *ipv6_stub __read_mostly = &(struct ipv6_stub) {
- .ipv6_dst_lookup_flow = eafnosupport_ipv6_dst_lookup_flow,
- .ipv6_route_input = eafnosupport_ipv6_route_input,
- .fib6_get_table = eafnosupport_fib6_get_table,
- .fib6_table_lookup = eafnosupport_fib6_table_lookup,
- .fib6_lookup = eafnosupport_fib6_lookup,
- .fib6_select_path = eafnosupport_fib6_select_path,
- .ip6_mtu_from_fib6 = eafnosupport_ip6_mtu_from_fib6,
- .fib6_nh_init = eafnosupport_fib6_nh_init,
- .ip6_del_rt = eafnosupport_ip6_del_rt,
- };
- EXPORT_SYMBOL_GPL(ipv6_stub);
- /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
- const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
- EXPORT_SYMBOL(in6addr_loopback);
- const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
- EXPORT_SYMBOL(in6addr_any);
- const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
- EXPORT_SYMBOL(in6addr_linklocal_allnodes);
- const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
- EXPORT_SYMBOL(in6addr_linklocal_allrouters);
- const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
- EXPORT_SYMBOL(in6addr_interfacelocal_allnodes);
- const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
- EXPORT_SYMBOL(in6addr_interfacelocal_allrouters);
- const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
- EXPORT_SYMBOL(in6addr_sitelocal_allrouters);
- static void snmp6_free_dev(struct inet6_dev *idev)
- {
- kfree(idev->stats.icmpv6msgdev);
- kfree(idev->stats.icmpv6dev);
- free_percpu(idev->stats.ipv6);
- }
- static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
- {
- struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
- snmp6_free_dev(idev);
- kfree(idev);
- }
- /* Nobody refers to this device, we may destroy it. */
- void in6_dev_finish_destroy(struct inet6_dev *idev)
- {
- struct net_device *dev = idev->dev;
- WARN_ON(!list_empty(&idev->addr_list));
- WARN_ON(idev->mc_list);
- WARN_ON(timer_pending(&idev->rs_timer));
- #ifdef NET_REFCNT_DEBUG
- pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
- #endif
- dev_put(dev);
- if (!idev->dead) {
- pr_warn("Freeing alive inet6 device %p\n", idev);
- return;
- }
- call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
- }
- EXPORT_SYMBOL(in6_dev_finish_destroy);