705f1c869d
Eric Dumazet noticed that all no-nonexthop or no-gateway routes which are already marked DST_HOST (e.g. input routes routes) will always be invalidated during sk_dst_check. Thus per-socket dst caching absolutely had no effect and early demuxing had no effect. Thus this patch removes rt6i_genid: fn_sernum already gets modified during add operations, so we only must ensure we mutate fn_sernum during ipv6 address remove operations. This is a fairly cost extensive operations, but address removal should not happen that often. Also our mtu update functions do the same and we heard no complains so far. xfrm policy changes also cause a call into fib6_flush_trees. Also plug a hole in rt6_info (no cacheline changes). I verified via tracing that this change has effect. Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: YOSHIFUJI Hideaki <hideaki@yoshifuji.org> Cc: Vlad Yasevich <vyasevich@gmail.com> Cc: Nicolas Dichtel <nicolas.dichtel@6wind.com> Cc: Martin Lau <kafai@fb.com> Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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 != NULL);
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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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