| // 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; |
| } |
| |
| 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); |