249 lines
7.5 KiB
C
249 lines
7.5 KiB
C
/*
|
|
* 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/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 int eafnosupport_ipv6_dst_lookup(struct net *net, struct sock *u1,
|
|
struct dst_entry **u2,
|
|
struct flowi6 *u3)
|
|
{
|
|
return -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;
|
|
}
|
|
|
|
const struct ipv6_stub *ipv6_stub __read_mostly = &(struct ipv6_stub) {
|
|
.ipv6_dst_lookup = eafnosupport_ipv6_dst_lookup,
|
|
.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,
|
|
};
|
|
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);
|