diff options
Diffstat (limited to '')
-rw-r--r-- | net/ipv6/addrconf_core.c | 273 |
1 files changed, 273 insertions, 0 deletions
diff --git a/net/ipv6/addrconf_core.c b/net/ipv6/addrconf_core.c new file mode 100644 index 000000000..507a8353a --- /dev/null +++ b/net/ipv6/addrconf_core.c @@ -0,0 +1,273 @@ +// 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 + netdev_put(dev, &idev->dev_tracker); + 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); |