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Diffstat (limited to '')
| -rw-r--r-- | include/net/addrconf.h | 517 |
1 files changed, 517 insertions, 0 deletions
diff --git a/include/net/addrconf.h b/include/net/addrconf.h new file mode 100644 index 000000000..86eb2aba1 --- /dev/null +++ b/include/net/addrconf.h @@ -0,0 +1,517 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ADDRCONF_H +#define _ADDRCONF_H + +#define MAX_RTR_SOLICITATIONS -1 /* unlimited */ +#define RTR_SOLICITATION_INTERVAL (4*HZ) +#define RTR_SOLICITATION_MAX_INTERVAL (3600*HZ) /* 1 hour */ + +#define MIN_VALID_LIFETIME (2*3600) /* 2 hours */ + +#define TEMP_VALID_LIFETIME (7*86400) +#define TEMP_PREFERRED_LIFETIME (86400) +#define REGEN_MAX_RETRY (3) +#define MAX_DESYNC_FACTOR (600) + +#define ADDR_CHECK_FREQUENCY (120*HZ) + +#define IPV6_MAX_ADDRESSES 16 + +#define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ / 50 : 1) +#define ADDRCONF_TIMER_FUZZ (HZ / 4) +#define ADDRCONF_TIMER_FUZZ_MAX (HZ) + +#define ADDRCONF_NOTIFY_PRIORITY 0 + +#include <linux/in.h> +#include <linux/in6.h> + +struct prefix_info { + __u8 type; + __u8 length; + __u8 prefix_len; + + union __packed { + __u8 flags; + struct __packed { +#if defined(__BIG_ENDIAN_BITFIELD) + __u8 onlink : 1, + autoconf : 1, + reserved : 6; +#elif defined(__LITTLE_ENDIAN_BITFIELD) + __u8 reserved : 6, + autoconf : 1, + onlink : 1; +#else +#error "Please fix <asm/byteorder.h>" +#endif + }; + }; + __be32 valid; + __be32 prefered; + __be32 reserved2; + + struct in6_addr prefix; +}; + +/* rfc4861 4.6.2: IPv6 PIO is 32 bytes in size */ +static_assert(sizeof(struct prefix_info) == 32); + +#include <linux/ipv6.h> +#include <linux/netdevice.h> +#include <net/if_inet6.h> +#include <net/ipv6.h> + +struct in6_validator_info { + struct in6_addr i6vi_addr; + struct inet6_dev *i6vi_dev; + struct netlink_ext_ack *extack; +}; + +struct ifa6_config { + const struct in6_addr *pfx; + unsigned int plen; + + u8 ifa_proto; + + const struct in6_addr *peer_pfx; + + u32 rt_priority; + u32 ifa_flags; + u32 preferred_lft; + u32 valid_lft; + u16 scope; +}; + +int addrconf_init(void); +void addrconf_cleanup(void); + +int addrconf_add_ifaddr(struct net *net, void __user *arg); +int addrconf_del_ifaddr(struct net *net, void __user *arg); +int addrconf_set_dstaddr(struct net *net, void __user *arg); + +int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, + const struct net_device *dev, int strict); +int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, + const struct net_device *dev, bool skip_dev_check, + int strict, u32 banned_flags); + +#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) +int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr); +#endif + +int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs, + unsigned char nsegs); + +bool ipv6_chk_custom_prefix(const struct in6_addr *addr, + const unsigned int prefix_len, + struct net_device *dev); + +int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev); + +struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr, + struct net_device *dev); + +struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, + const struct in6_addr *addr, + struct net_device *dev, int strict); + +int ipv6_dev_get_saddr(struct net *net, const struct net_device *dev, + const struct in6_addr *daddr, unsigned int srcprefs, + struct in6_addr *saddr); +int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, + u32 banned_flags); +bool inet_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2, + bool match_wildcard); +bool inet_rcv_saddr_any(const struct sock *sk); +void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr); +void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr); + +void addrconf_add_linklocal(struct inet6_dev *idev, + const struct in6_addr *addr, u32 flags); + +int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, + const struct prefix_info *pinfo, + struct inet6_dev *in6_dev, + const struct in6_addr *addr, int addr_type, + u32 addr_flags, bool sllao, bool tokenized, + __u32 valid_lft, u32 prefered_lft); + +static inline void addrconf_addr_eui48_base(u8 *eui, const char *const addr) +{ + memcpy(eui, addr, 3); + eui[3] = 0xFF; + eui[4] = 0xFE; + memcpy(eui + 5, addr + 3, 3); +} + +static inline void addrconf_addr_eui48(u8 *eui, const char *const addr) +{ + addrconf_addr_eui48_base(eui, addr); + eui[0] ^= 2; +} + +static inline int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) +{ + if (dev->addr_len != ETH_ALEN) + return -1; + + /* + * The zSeries OSA network cards can be shared among various + * OS instances, but the OSA cards have only one MAC address. + * This leads to duplicate address conflicts in conjunction + * with IPv6 if more than one instance uses the same card. + * + * The driver for these cards can deliver a unique 16-bit + * identifier for each instance sharing the same card. It is + * placed instead of 0xFFFE in the interface identifier. The + * "u" bit of the interface identifier is not inverted in this + * case. Hence the resulting interface identifier has local + * scope according to RFC2373. + */ + + addrconf_addr_eui48_base(eui, dev->dev_addr); + + if (dev->dev_id) { + eui[3] = (dev->dev_id >> 8) & 0xFF; + eui[4] = dev->dev_id & 0xFF; + } else { + eui[0] ^= 2; + } + + return 0; +} + +static inline unsigned long addrconf_timeout_fixup(u32 timeout, + unsigned int unit) +{ + if (timeout == 0xffffffff) + return ~0UL; + + /* + * Avoid arithmetic overflow. + * Assuming unit is constant and non-zero, this "if" statement + * will go away on 64bit archs. + */ + if (0xfffffffe > LONG_MAX / unit && timeout > LONG_MAX / unit) + return LONG_MAX / unit; + + return timeout; +} + +static inline int addrconf_finite_timeout(unsigned long timeout) +{ + return ~timeout; +} + +/* + * IPv6 Address Label subsystem (addrlabel.c) + */ +int ipv6_addr_label_init(void); +void ipv6_addr_label_cleanup(void); +int ipv6_addr_label_rtnl_register(void); +u32 ipv6_addr_label(struct net *net, const struct in6_addr *addr, + int type, int ifindex); + +/* + * multicast prototypes (mcast.c) + */ +static inline bool ipv6_mc_may_pull(struct sk_buff *skb, + unsigned int len) +{ + if (skb_transport_offset(skb) + ipv6_transport_len(skb) < len) + return false; + + return pskb_may_pull(skb, len); +} + +int ipv6_sock_mc_join(struct sock *sk, int ifindex, + const struct in6_addr *addr); +int ipv6_sock_mc_drop(struct sock *sk, int ifindex, + const struct in6_addr *addr); +void __ipv6_sock_mc_close(struct sock *sk); +void ipv6_sock_mc_close(struct sock *sk); +bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, + const struct in6_addr *src_addr); + +int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr); +int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr); +int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr); +void ipv6_mc_up(struct inet6_dev *idev); +void ipv6_mc_down(struct inet6_dev *idev); +void ipv6_mc_unmap(struct inet6_dev *idev); +void ipv6_mc_remap(struct inet6_dev *idev); +void ipv6_mc_init_dev(struct inet6_dev *idev); +void ipv6_mc_destroy_dev(struct inet6_dev *idev); +int ipv6_mc_check_mld(struct sk_buff *skb); +void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp); + +bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, + const struct in6_addr *src_addr); + +void ipv6_mc_dad_complete(struct inet6_dev *idev); + +/* + * identify MLD packets for MLD filter exceptions + */ +static inline bool ipv6_is_mld(struct sk_buff *skb, int nexthdr, int offset) +{ + struct icmp6hdr *hdr; + + if (nexthdr != IPPROTO_ICMPV6 || + !pskb_network_may_pull(skb, offset + sizeof(struct icmp6hdr))) + return false; + + hdr = (struct icmp6hdr *)(skb_network_header(skb) + offset); + + switch (hdr->icmp6_type) { + case ICMPV6_MGM_QUERY: + case ICMPV6_MGM_REPORT: + case ICMPV6_MGM_REDUCTION: + case ICMPV6_MLD2_REPORT: + return true; + default: + break; + } + return false; +} + +void addrconf_prefix_rcv(struct net_device *dev, + u8 *opt, int len, bool sllao); + +/* + * anycast prototypes (anycast.c) + */ +int ipv6_sock_ac_join(struct sock *sk, int ifindex, + const struct in6_addr *addr); +int ipv6_sock_ac_drop(struct sock *sk, int ifindex, + const struct in6_addr *addr); +void __ipv6_sock_ac_close(struct sock *sk); +void ipv6_sock_ac_close(struct sock *sk); + +int __ipv6_dev_ac_inc(struct inet6_dev *idev, const struct in6_addr *addr); +int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr); +void ipv6_ac_destroy_dev(struct inet6_dev *idev); +bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev, + const struct in6_addr *addr); +bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev, + const struct in6_addr *addr); +int ipv6_anycast_init(void); +void ipv6_anycast_cleanup(void); + +/* Device notifier */ +int register_inet6addr_notifier(struct notifier_block *nb); +int unregister_inet6addr_notifier(struct notifier_block *nb); +int inet6addr_notifier_call_chain(unsigned long val, void *v); + +int register_inet6addr_validator_notifier(struct notifier_block *nb); +int unregister_inet6addr_validator_notifier(struct notifier_block *nb); +int inet6addr_validator_notifier_call_chain(unsigned long val, void *v); + +void inet6_netconf_notify_devconf(struct net *net, int event, int type, + int ifindex, struct ipv6_devconf *devconf); + +/** + * __in6_dev_get - get inet6_dev pointer from netdevice + * @dev: network device + * + * Caller must hold rcu_read_lock or RTNL, because this function + * does not take a reference on the inet6_dev. + */ +static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev) +{ + return rcu_dereference_rtnl(dev->ip6_ptr); +} + +/** + * __in6_dev_stats_get - get inet6_dev pointer for stats + * @dev: network device + * @skb: skb for original incoming interface if neeeded + * + * Caller must hold rcu_read_lock or RTNL, because this function + * does not take a reference on the inet6_dev. + */ +static inline struct inet6_dev *__in6_dev_stats_get(const struct net_device *dev, + const struct sk_buff *skb) +{ + if (netif_is_l3_master(dev)) + dev = dev_get_by_index_rcu(dev_net(dev), inet6_iif(skb)); + return __in6_dev_get(dev); +} + +/** + * __in6_dev_get_safely - get inet6_dev pointer from netdevice + * @dev: network device + * + * This is a safer version of __in6_dev_get + */ +static inline struct inet6_dev *__in6_dev_get_safely(const struct net_device *dev) +{ + if (likely(dev)) + return rcu_dereference_rtnl(dev->ip6_ptr); + else + return NULL; +} + +/** + * in6_dev_get - get inet6_dev pointer from netdevice + * @dev: network device + * + * This version can be used in any context, and takes a reference + * on the inet6_dev. Callers must use in6_dev_put() later to + * release this reference. + */ +static inline struct inet6_dev *in6_dev_get(const struct net_device *dev) +{ + struct inet6_dev *idev; + + rcu_read_lock(); + idev = rcu_dereference(dev->ip6_ptr); + if (idev) + refcount_inc(&idev->refcnt); + rcu_read_unlock(); + return idev; +} + +static inline struct neigh_parms *__in6_dev_nd_parms_get_rcu(const struct net_device *dev) +{ + struct inet6_dev *idev = __in6_dev_get(dev); + + return idev ? idev->nd_parms : NULL; +} + +void in6_dev_finish_destroy(struct inet6_dev *idev); + +static inline void in6_dev_put(struct inet6_dev *idev) +{ + if (refcount_dec_and_test(&idev->refcnt)) + in6_dev_finish_destroy(idev); +} + +static inline void in6_dev_put_clear(struct inet6_dev **pidev) +{ + struct inet6_dev *idev = *pidev; + + if (idev) { + in6_dev_put(idev); + *pidev = NULL; + } +} + +static inline void __in6_dev_put(struct inet6_dev *idev) +{ + refcount_dec(&idev->refcnt); +} + +static inline void in6_dev_hold(struct inet6_dev *idev) +{ + refcount_inc(&idev->refcnt); +} + +/* called with rcu_read_lock held */ +static inline bool ip6_ignore_linkdown(const struct net_device *dev) +{ + const struct inet6_dev *idev = __in6_dev_get(dev); + + if (unlikely(!idev)) + return true; + + return !!idev->cnf.ignore_routes_with_linkdown; +} + +void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp); + +static inline void in6_ifa_put(struct inet6_ifaddr *ifp) +{ + if (refcount_dec_and_test(&ifp->refcnt)) + inet6_ifa_finish_destroy(ifp); +} + +static inline void __in6_ifa_put(struct inet6_ifaddr *ifp) +{ + refcount_dec(&ifp->refcnt); +} + +static inline void in6_ifa_hold(struct inet6_ifaddr *ifp) +{ + refcount_inc(&ifp->refcnt); +} + + +/* + * compute link-local solicited-node multicast address + */ + +static inline void addrconf_addr_solict_mult(const struct in6_addr *addr, + struct in6_addr *solicited) +{ + ipv6_addr_set(solicited, + htonl(0xFF020000), 0, + htonl(0x1), + htonl(0xFF000000) | addr->s6_addr32[3]); +} + +static inline bool ipv6_addr_is_ll_all_nodes(const struct in6_addr *addr) +{ +#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 + __be64 *p = (__force __be64 *)addr; + return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(1))) == 0UL; +#else + return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | + addr->s6_addr32[1] | addr->s6_addr32[2] | + (addr->s6_addr32[3] ^ htonl(0x00000001))) == 0; +#endif +} + +static inline bool ipv6_addr_is_ll_all_routers(const struct in6_addr *addr) +{ +#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 + __be64 *p = (__force __be64 *)addr; + return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | (p[1] ^ cpu_to_be64(2))) == 0UL; +#else + return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | + addr->s6_addr32[1] | addr->s6_addr32[2] | + (addr->s6_addr32[3] ^ htonl(0x00000002))) == 0; +#endif +} + +static inline bool ipv6_addr_is_isatap(const struct in6_addr *addr) +{ + return (addr->s6_addr32[2] | htonl(0x02000000)) == htonl(0x02005EFE); +} + +static inline bool ipv6_addr_is_solict_mult(const struct in6_addr *addr) +{ +#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 + __be64 *p = (__force __be64 *)addr; + return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | + ((p[1] ^ cpu_to_be64(0x00000001ff000000UL)) & + cpu_to_be64(0xffffffffff000000UL))) == 0UL; +#else + return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | + addr->s6_addr32[1] | + (addr->s6_addr32[2] ^ htonl(0x00000001)) | + (addr->s6_addr[12] ^ 0xff)) == 0; +#endif +} + +static inline bool ipv6_addr_is_all_snoopers(const struct in6_addr *addr) +{ +#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) && BITS_PER_LONG == 64 + __be64 *p = (__force __be64 *)addr; + + return ((p[0] ^ cpu_to_be64(0xff02000000000000UL)) | + (p[1] ^ cpu_to_be64(0x6a))) == 0UL; +#else + return ((addr->s6_addr32[0] ^ htonl(0xff020000)) | + addr->s6_addr32[1] | addr->s6_addr32[2] | + (addr->s6_addr32[3] ^ htonl(0x0000006a))) == 0; +#endif +} + +#ifdef CONFIG_PROC_FS +int if6_proc_init(void); +void if6_proc_exit(void); +#endif + +#endif |