net/ipv6/addrconf_core.c - third_party/kernel - Git at Google

 // 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,
 				   bool skip_notify)
 {
 	return -EAFNOSUPPORT;
 }

 static int eafnosupport_ipv6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
 				      int (*output)(struct net *, struct sock *, struct sk_buff *))
 {
 	kfree_skb(skb);
 	return -EAFNOSUPPORT;
 }

 static struct net_device *eafnosupport_ipv6_dev_find(struct net *net, const struct in6_addr *addr,
 						     struct net_device *dev)
 {
 	return ERR_PTR(-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,
 	.ipv6_fragment	   = eafnosupport_ipv6_fragment,
 	.ipv6_dev_find     = eafnosupport_ipv6_dev_find,
 };
 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(rcu_access_pointer(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);
	// 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,
	bool skip_notify)
	{
	return -EAFNOSUPPORT;
	}

	static int eafnosupport_ipv6_fragment(struct net net, struct sock sk, struct sk_buff *skb,
	int (output)(struct net , struct sock , struct sk_buff ))
	{
	kfree_skb(skb);
	return -EAFNOSUPPORT;
	}

	static struct net_device eafnosupport_ipv6_dev_find(struct net net, const struct in6_addr *addr,
	struct net_device *dev)
	{
	return ERR_PTR(-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,
	.ipv6_fragment = eafnosupport_ipv6_fragment,
	.ipv6_dev_find = eafnosupport_ipv6_dev_find,
	};
	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(rcu_access_pointer(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);