158 lines
4.9 KiB
C
158 lines
4.9 KiB
C
/*
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* IPv6 library code, needed by static components when full IPv6 support is
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* not configured or static.
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*/
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#include <linux/export.h>
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#include <net/ipv6.h>
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#include <net/addrconf.h>
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#include <net/ip.h>
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/* if ipv6 module registers this function is used by xfrm to force all
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* sockets to relookup their nodes - this is fairly expensive, be
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* careful
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*/
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void (*__fib6_flush_trees)(struct net *);
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EXPORT_SYMBOL(__fib6_flush_trees);
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#define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16)
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static inline unsigned int ipv6_addr_scope2type(unsigned int scope)
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{
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switch (scope) {
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case IPV6_ADDR_SCOPE_NODELOCAL:
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return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
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IPV6_ADDR_LOOPBACK);
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case IPV6_ADDR_SCOPE_LINKLOCAL:
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return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
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IPV6_ADDR_LINKLOCAL);
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case IPV6_ADDR_SCOPE_SITELOCAL:
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return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
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IPV6_ADDR_SITELOCAL);
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}
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return IPV6_ADDR_SCOPE_TYPE(scope);
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}
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int __ipv6_addr_type(const struct in6_addr *addr)
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{
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__be32 st;
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st = addr->s6_addr32[0];
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/* Consider all addresses with the first three bits different of
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000 and 111 as unicasts.
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*/
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if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
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(st & htonl(0xE0000000)) != htonl(0xE0000000))
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return (IPV6_ADDR_UNICAST |
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IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
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if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
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/* multicast */
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/* addr-select 3.1 */
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return (IPV6_ADDR_MULTICAST |
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ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
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}
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if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
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return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST |
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IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.1 */
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if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
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return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
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IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL)); /* addr-select 3.1 */
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if ((st & htonl(0xFE000000)) == htonl(0xFC000000))
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return (IPV6_ADDR_UNICAST |
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IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* RFC 4193 */
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if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
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if (addr->s6_addr32[2] == 0) {
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if (addr->s6_addr32[3] == 0)
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return IPV6_ADDR_ANY;
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if (addr->s6_addr32[3] == htonl(0x00000001))
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return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
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IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.4 */
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return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
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IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
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}
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if (addr->s6_addr32[2] == htonl(0x0000ffff))
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return (IPV6_ADDR_MAPPED |
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IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
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}
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return (IPV6_ADDR_UNICAST |
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IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.4 */
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}
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EXPORT_SYMBOL(__ipv6_addr_type);
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static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
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int register_inet6addr_notifier(struct notifier_block *nb)
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{
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return atomic_notifier_chain_register(&inet6addr_chain, nb);
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}
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EXPORT_SYMBOL(register_inet6addr_notifier);
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int unregister_inet6addr_notifier(struct notifier_block *nb)
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{
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return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
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}
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EXPORT_SYMBOL(unregister_inet6addr_notifier);
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int inet6addr_notifier_call_chain(unsigned long val, void *v)
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{
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return atomic_notifier_call_chain(&inet6addr_chain, val, v);
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}
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EXPORT_SYMBOL(inet6addr_notifier_call_chain);
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const struct ipv6_stub *ipv6_stub __read_mostly;
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EXPORT_SYMBOL_GPL(ipv6_stub);
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/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
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const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
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EXPORT_SYMBOL(in6addr_loopback);
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const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
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EXPORT_SYMBOL(in6addr_any);
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const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
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EXPORT_SYMBOL(in6addr_linklocal_allnodes);
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const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
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EXPORT_SYMBOL(in6addr_linklocal_allrouters);
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const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
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EXPORT_SYMBOL(in6addr_interfacelocal_allnodes);
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const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
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EXPORT_SYMBOL(in6addr_interfacelocal_allrouters);
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const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
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EXPORT_SYMBOL(in6addr_sitelocal_allrouters);
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static void snmp6_free_dev(struct inet6_dev *idev)
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{
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kfree(idev->stats.icmpv6msgdev);
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kfree(idev->stats.icmpv6dev);
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free_percpu(idev->stats.ipv6);
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}
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/* Nobody refers to this device, we may destroy it. */
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void in6_dev_finish_destroy(struct inet6_dev *idev)
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{
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struct net_device *dev = idev->dev;
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WARN_ON(!list_empty(&idev->addr_list));
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WARN_ON(idev->mc_list);
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WARN_ON(timer_pending(&idev->rs_timer));
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#ifdef NET_REFCNT_DEBUG
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pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
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#endif
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dev_put(dev);
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if (!idev->dead) {
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pr_warn("Freeing alive inet6 device %p\n", idev);
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return;
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}
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snmp6_free_dev(idev);
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kfree_rcu(idev, rcu);
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}
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EXPORT_SYMBOL(in6_dev_finish_destroy);
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