/* * IPv6 Address [auto]configuration * Linux INET6 implementation * * Authors: * Pedro Roque <roque@di.fc.ul.pt> * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> * * $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $ * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ /* * Changes: * * Janos Farkas : delete timer on ifdown * <chexum@bankinf.banki.hu> * Andi Kleen : kill double kfree on module * unload. * Maciej W. Rozycki : FDDI support * sekiya@USAGI : Don't send too many RS * packets. * yoshfuji@USAGI : Fixed interval between DAD * packets. * YOSHIFUJI Hideaki @USAGI : improved accuracy of * address validation timer. * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) * support. * Yuji SEKIYA @USAGI : Don't assign a same IPv6 * address on a same interface. * YOSHIFUJI Hideaki @USAGI : ARCnet support * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to * seq_file. * YOSHIFUJI Hideaki @USAGI : improved source address * selection; consider scope, * status etc. */ #include <linux/errno.h> #include <linux/types.h> #include <linux/socket.h> #include <linux/sockios.h> #include <linux/sched.h> #include <linux/net.h> #include <linux/in6.h> #include <linux/netdevice.h> #include <linux/if_arp.h> #include <linux/if_arcnet.h> #include <linux/if_infiniband.h> #include <linux/route.h> #include <linux/inetdevice.h> #include <linux/init.h> #ifdef CONFIG_SYSCTL #include <linux/sysctl.h> #endif #include <linux/capability.h> #include <linux/delay.h> #include <linux/notifier.h> #include <linux/string.h> #include <net/sock.h> #include <net/snmp.h> #include <net/ipv6.h> #include <net/protocol.h> #include <net/ndisc.h> #include <net/ip6_route.h> #include <net/addrconf.h> #include <net/tcp.h> #include <net/ip.h> #include <linux/if_tunnel.h> #include <linux/rtnetlink.h> #ifdef CONFIG_IPV6_PRIVACY #include <linux/random.h> #endif #include <asm/uaccess.h> #include <linux/proc_fs.h> #include <linux/seq_file.h> /* Set to 3 to get tracing... */ #define ACONF_DEBUG 2 #if ACONF_DEBUG >= 3 #define ADBG(x) printk x #else #define ADBG(x) #endif #define INFINITY_LIFE_TIME 0xFFFFFFFF #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b))) #ifdef CONFIG_SYSCTL static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p); static void addrconf_sysctl_unregister(struct ipv6_devconf *p); #endif #ifdef CONFIG_IPV6_PRIVACY static int __ipv6_regen_rndid(struct inet6_dev *idev); static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); static void ipv6_regen_rndid(unsigned long data); static int desync_factor = MAX_DESYNC_FACTOR * HZ; #endif static int ipv6_count_addresses(struct inet6_dev *idev); /* * Configured unicast address hash table */ static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE]; static DEFINE_RWLOCK(addrconf_hash_lock); /* Protects inet6 devices */ DEFINE_RWLOCK(addrconf_lock); static void addrconf_verify(unsigned long); static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); static DEFINE_SPINLOCK(addrconf_verify_lock); static void addrconf_join_anycast(struct inet6_ifaddr *ifp); static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); static int addrconf_ifdown(struct net_device *dev, int how); static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags); static void addrconf_dad_timer(unsigned long data); static void addrconf_dad_completed(struct inet6_ifaddr *ifp); static void addrconf_dad_run(struct inet6_dev *idev); static void addrconf_rs_timer(unsigned long data); static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); static void inet6_prefix_notify(int event, struct inet6_dev *idev, struct prefix_info *pinfo); static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev); static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); struct ipv6_devconf ipv6_devconf = { .forwarding = 0, .hop_limit = IPV6_DEFAULT_HOPLIMIT, .mtu6 = IPV6_MIN_MTU, .accept_ra = 1, .accept_redirects = 1, .autoconf = 1, .force_mld_version = 0, .dad_transmits = 1, .rtr_solicits = MAX_RTR_SOLICITATIONS, .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, #ifdef CONFIG_IPV6_PRIVACY .use_tempaddr = 0, .temp_valid_lft = TEMP_VALID_LIFETIME, .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, .regen_max_retry = REGEN_MAX_RETRY, .max_desync_factor = MAX_DESYNC_FACTOR, #endif .max_addresses = IPV6_MAX_ADDRESSES, .accept_ra_defrtr = 1, .accept_ra_pinfo = 1, #ifdef CONFIG_IPV6_ROUTER_PREF .accept_ra_rtr_pref = 1, .rtr_probe_interval = 60 * HZ, #ifdef CONFIG_IPV6_ROUTE_INFO .accept_ra_rt_info_max_plen = 0, #endif #endif }; static struct ipv6_devconf ipv6_devconf_dflt = { .forwarding = 0, .hop_limit = IPV6_DEFAULT_HOPLIMIT, .mtu6 = IPV6_MIN_MTU, .accept_ra = 1, .accept_redirects = 1, .autoconf = 1, .dad_transmits = 1, .rtr_solicits = MAX_RTR_SOLICITATIONS, .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, #ifdef CONFIG_IPV6_PRIVACY .use_tempaddr = 0, .temp_valid_lft = TEMP_VALID_LIFETIME, .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, .regen_max_retry = REGEN_MAX_RETRY, .max_desync_factor = MAX_DESYNC_FACTOR, #endif .max_addresses = IPV6_MAX_ADDRESSES, .accept_ra_defrtr = 1, .accept_ra_pinfo = 1, #ifdef CONFIG_IPV6_ROUTER_PREF .accept_ra_rtr_pref = 1, .rtr_probe_interval = 60 * HZ, #ifdef CONFIG_IPV6_ROUTE_INFO .accept_ra_rt_info_max_plen = 0, #endif #endif }; /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ #if 0 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; #endif const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; #define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16) static inline unsigned ipv6_addr_scope2type(unsigned 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) { u32 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 ((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_RESERVED | IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.4 */ } static void addrconf_del_timer(struct inet6_ifaddr *ifp) { if (del_timer(&ifp->timer)) __in6_ifa_put(ifp); } enum addrconf_timer_t { AC_NONE, AC_DAD, AC_RS, }; static void addrconf_mod_timer(struct inet6_ifaddr *ifp, enum addrconf_timer_t what, unsigned long when) { if (!del_timer(&ifp->timer)) in6_ifa_hold(ifp); switch (what) { case AC_DAD: ifp->timer.function = addrconf_dad_timer; break; case AC_RS: ifp->timer.function = addrconf_rs_timer; break; default:; } ifp->timer.expires = jiffies + when; add_timer(&ifp->timer); } /* Nobody refers to this device, we may destroy it. */ void in6_dev_finish_destroy(struct inet6_dev *idev) { struct net_device *dev = idev->dev; BUG_TRAP(idev->addr_list==NULL); BUG_TRAP(idev->mc_list==NULL); #ifdef NET_REFCNT_DEBUG printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL"); #endif dev_put(dev); if (!idev->dead) { printk("Freeing alive inet6 device %p\n", idev); return; } snmp6_free_dev(idev); kfree(idev); } static struct inet6_dev * ipv6_add_dev(struct net_device *dev) { struct inet6_dev *ndev; ASSERT_RTNL(); if (dev->mtu < IPV6_MIN_MTU) return NULL; ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); if (ndev == NULL) return NULL; rwlock_init(&ndev->lock); ndev->dev = dev; memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf)); ndev->cnf.mtu6 = dev->mtu; ndev->cnf.sysctl = NULL; ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); if (ndev->nd_parms == NULL) { kfree(ndev); return NULL; } /* We refer to the device */ dev_hold(dev); if (snmp6_alloc_dev(ndev) < 0) { ADBG((KERN_WARNING "%s(): cannot allocate memory for statistics; dev=%s.\n", __FUNCTION__, dev->name)); neigh_parms_release(&nd_tbl, ndev->nd_parms); ndev->dead = 1; in6_dev_finish_destroy(ndev); return NULL; } if (snmp6_register_dev(ndev) < 0) { ADBG((KERN_WARNING "%s(): cannot create /proc/net/dev_snmp6/%s\n", __FUNCTION__, dev->name)); neigh_parms_release(&nd_tbl, ndev->nd_parms); ndev->dead = 1; in6_dev_finish_destroy(ndev); return NULL; } /* One reference from device. We must do this before * we invoke __ipv6_regen_rndid(). */ in6_dev_hold(ndev); #ifdef CONFIG_IPV6_PRIVACY init_timer(&ndev->regen_timer); ndev->regen_timer.function = ipv6_regen_rndid; ndev->regen_timer.data = (unsigned long) ndev; if ((dev->flags&IFF_LOOPBACK) || dev->type == ARPHRD_TUNNEL || dev->type == ARPHRD_NONE || dev->type == ARPHRD_SIT) { printk(KERN_INFO "%s: Disabled Privacy Extensions\n", dev->name); ndev->cnf.use_tempaddr = -1; } else { in6_dev_hold(ndev); ipv6_regen_rndid((unsigned long) ndev); } #endif if (netif_carrier_ok(dev)) ndev->if_flags |= IF_READY; write_lock_bh(&addrconf_lock); dev->ip6_ptr = ndev; write_unlock_bh(&addrconf_lock); ipv6_mc_init_dev(ndev); ndev->tstamp = jiffies; #ifdef CONFIG_SYSCTL neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6, NET_IPV6_NEIGH, "ipv6", &ndisc_ifinfo_sysctl_change, NULL); addrconf_sysctl_register(ndev, &ndev->cnf); #endif return ndev; } static struct inet6_dev * ipv6_find_idev(struct net_device *dev) { struct inet6_dev *idev; ASSERT_RTNL(); if ((idev = __in6_dev_get(dev)) == NULL) { if ((idev = ipv6_add_dev(dev)) == NULL) return NULL; } if (dev->flags&IFF_UP) ipv6_mc_up(idev); return idev; } #ifdef CONFIG_SYSCTL static void dev_forward_change(struct inet6_dev *idev) { struct net_device *dev; struct inet6_ifaddr *ifa; struct in6_addr addr; if (!idev) return; dev = idev->dev; if (dev && (dev->flags & IFF_MULTICAST)) { ipv6_addr_all_routers(&addr); if (idev->cnf.forwarding) ipv6_dev_mc_inc(dev, &addr); else ipv6_dev_mc_dec(dev, &addr); } for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) { if (idev->cnf.forwarding) addrconf_join_anycast(ifa); else addrconf_leave_anycast(ifa); } } static void addrconf_forward_change(void) { struct net_device *dev; struct inet6_dev *idev; read_lock(&dev_base_lock); for (dev=dev_base; dev; dev=dev->next) { read_lock(&addrconf_lock); idev = __in6_dev_get(dev); if (idev) { int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding); idev->cnf.forwarding = ipv6_devconf.forwarding; if (changed) dev_forward_change(idev); } read_unlock(&addrconf_lock); } read_unlock(&dev_base_lock); } #endif /* Nobody refers to this ifaddr, destroy it */ void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) { BUG_TRAP(ifp->if_next==NULL); BUG_TRAP(ifp->lst_next==NULL); #ifdef NET_REFCNT_DEBUG printk(KERN_DEBUG "inet6_ifa_finish_destroy\n"); #endif in6_dev_put(ifp->idev); if (del_timer(&ifp->timer)) printk("Timer is still running, when freeing ifa=%p\n", ifp); if (!ifp->dead) { printk("Freeing alive inet6 address %p\n", ifp); return; } dst_release(&ifp->rt->u.dst); kfree(ifp); } static void ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) { struct inet6_ifaddr *ifa, **ifap; int ifp_scope = ipv6_addr_src_scope(&ifp->addr); /* * Each device address list is sorted in order of scope - * global before linklocal. */ for (ifap = &idev->addr_list; (ifa = *ifap) != NULL; ifap = &ifa->if_next) { if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) break; } ifp->if_next = *ifap; *ifap = ifp; } /* On success it returns ifp with increased reference count */ static struct inet6_ifaddr * ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, int scope, u32 flags) { struct inet6_ifaddr *ifa = NULL; struct rt6_info *rt; int hash; int err = 0; read_lock_bh(&addrconf_lock); if (idev->dead) { err = -ENODEV; /*XXX*/ goto out2; } write_lock(&addrconf_hash_lock); /* Ignore adding duplicate addresses on an interface */ if (ipv6_chk_same_addr(addr, idev->dev)) { ADBG(("ipv6_add_addr: already assigned\n")); err = -EEXIST; goto out; } ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); if (ifa == NULL) { ADBG(("ipv6_add_addr: malloc failed\n")); err = -ENOBUFS; goto out; } rt = addrconf_dst_alloc(idev, addr, 0); if (IS_ERR(rt)) { err = PTR_ERR(rt); goto out; } ipv6_addr_copy(&ifa->addr, addr); spin_lock_init(&ifa->lock); init_timer(&ifa->timer); ifa->timer.data = (unsigned long) ifa; ifa->scope = scope; ifa->prefix_len = pfxlen; ifa->flags = flags | IFA_F_TENTATIVE; ifa->cstamp = ifa->tstamp = jiffies; ifa->idev = idev; in6_dev_hold(idev); /* For caller */ in6_ifa_hold(ifa); /* Add to big hash table */ hash = ipv6_addr_hash(addr); ifa->lst_next = inet6_addr_lst[hash]; inet6_addr_lst[hash] = ifa; in6_ifa_hold(ifa); write_unlock(&addrconf_hash_lock); write_lock(&idev->lock); /* Add to inet6_dev unicast addr list. */ ipv6_link_dev_addr(idev, ifa); #ifdef CONFIG_IPV6_PRIVACY if (ifa->flags&IFA_F_TEMPORARY) { ifa->tmp_next = idev->tempaddr_list; idev->tempaddr_list = ifa; in6_ifa_hold(ifa); } #endif ifa->rt = rt; in6_ifa_hold(ifa); write_unlock(&idev->lock); out2: read_unlock_bh(&addrconf_lock); if (likely(err == 0)) atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); else { kfree(ifa); ifa = ERR_PTR(err); } return ifa; out: write_unlock(&addrconf_hash_lock); goto out2; } /* This function wants to get referenced ifp and releases it before return */ static void ipv6_del_addr(struct inet6_ifaddr *ifp) { struct inet6_ifaddr *ifa, **ifap; struct inet6_dev *idev = ifp->idev; int hash; int deleted = 0, onlink = 0; unsigned long expires = jiffies; hash = ipv6_addr_hash(&ifp->addr); ifp->dead = 1; write_lock_bh(&addrconf_hash_lock); for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL; ifap = &ifa->lst_next) { if (ifa == ifp) { *ifap = ifa->lst_next; __in6_ifa_put(ifp); ifa->lst_next = NULL; break; } } write_unlock_bh(&addrconf_hash_lock); write_lock_bh(&idev->lock); #ifdef CONFIG_IPV6_PRIVACY if (ifp->flags&IFA_F_TEMPORARY) { for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL; ifap = &ifa->tmp_next) { if (ifa == ifp) { *ifap = ifa->tmp_next; if (ifp->ifpub) { in6_ifa_put(ifp->ifpub); ifp->ifpub = NULL; } __in6_ifa_put(ifp); ifa->tmp_next = NULL; break; } } } #endif for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) { if (ifa == ifp) { *ifap = ifa->if_next; __in6_ifa_put(ifp); ifa->if_next = NULL; if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) break; deleted = 1; continue; } else if (ifp->flags & IFA_F_PERMANENT) { if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, ifp->prefix_len)) { if (ifa->flags & IFA_F_PERMANENT) { onlink = 1; if (deleted) break; } else { unsigned long lifetime; if (!onlink) onlink = -1; spin_lock(&ifa->lock); lifetime = min_t(unsigned long, ifa->valid_lft, 0x7fffffffUL/HZ); if (time_before(expires, ifa->tstamp + lifetime * HZ)) expires = ifa->tstamp + lifetime * HZ; spin_unlock(&ifa->lock); } } } ifap = &ifa->if_next; } write_unlock_bh(&idev->lock); ipv6_ifa_notify(RTM_DELADDR, ifp); atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); addrconf_del_timer(ifp); /* * Purge or update corresponding prefix * * 1) we don't purge prefix here if address was not permanent. * prefix is managed by its own lifetime. * 2) if there're no addresses, delete prefix. * 3) if there're still other permanent address(es), * corresponding prefix is still permanent. * 4) otherwise, update prefix lifetime to the * longest valid lifetime among the corresponding * addresses on the device. * Note: subsequent RA will update lifetime. * * --yoshfuji */ if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { struct in6_addr prefix; struct rt6_info *rt; ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1); if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { if (onlink == 0) { ip6_del_rt(rt, NULL, NULL, NULL); rt = NULL; } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { rt->rt6i_expires = expires; rt->rt6i_flags |= RTF_EXPIRES; } } dst_release(&rt->u.dst); } in6_ifa_put(ifp); } #ifdef CONFIG_IPV6_PRIVACY static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) { struct inet6_dev *idev = ifp->idev; struct in6_addr addr, *tmpaddr; unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp; int tmp_plen; int ret = 0; int max_addresses; write_lock(&idev->lock); if (ift) { spin_lock_bh(&ift->lock); memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); spin_unlock_bh(&ift->lock); tmpaddr = &addr; } else { tmpaddr = NULL; } retry: in6_dev_hold(idev); if (idev->cnf.use_tempaddr <= 0) { write_unlock(&idev->lock); printk(KERN_INFO "ipv6_create_tempaddr(): use_tempaddr is disabled.\n"); in6_dev_put(idev); ret = -1; goto out; } spin_lock_bh(&ifp->lock); if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { idev->cnf.use_tempaddr = -1; /*XXX*/ spin_unlock_bh(&ifp->lock); write_unlock(&idev->lock); printk(KERN_WARNING "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n"); in6_dev_put(idev); ret = -1; goto out; } in6_ifa_hold(ifp); memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) { spin_unlock_bh(&ifp->lock); write_unlock(&idev->lock); printk(KERN_WARNING "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n"); in6_ifa_put(ifp); in6_dev_put(idev); ret = -1; goto out; } memcpy(&addr.s6_addr[8], idev->rndid, 8); tmp_valid_lft = min_t(__u32, ifp->valid_lft, idev->cnf.temp_valid_lft); tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, idev->cnf.temp_prefered_lft - desync_factor / HZ); tmp_plen = ifp->prefix_len; max_addresses = idev->cnf.max_addresses; tmp_cstamp = ifp->cstamp; tmp_tstamp = ifp->tstamp; spin_unlock_bh(&ifp->lock); write_unlock(&idev->lock); ift = !max_addresses || ipv6_count_addresses(idev) < max_addresses ? ipv6_add_addr(idev, &addr, tmp_plen, ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, IFA_F_TEMPORARY) : NULL; if (!ift || IS_ERR(ift)) { in6_ifa_put(ifp); in6_dev_put(idev); printk(KERN_INFO "ipv6_create_tempaddr(): retry temporary address regeneration.\n"); tmpaddr = &addr; write_lock(&idev->lock); goto retry; } spin_lock_bh(&ift->lock); ift->ifpub = ifp; ift->valid_lft = tmp_valid_lft; ift->prefered_lft = tmp_prefered_lft; ift->cstamp = tmp_cstamp; ift->tstamp = tmp_tstamp; spin_unlock_bh(&ift->lock); addrconf_dad_start(ift, 0); in6_ifa_put(ift); in6_dev_put(idev); out: return ret; } #endif /* * Choose an appropriate source address (RFC3484) */ struct ipv6_saddr_score { int addr_type; unsigned int attrs; int matchlen; int scope; unsigned int rule; }; #define IPV6_SADDR_SCORE_LOCAL 0x0001 #define IPV6_SADDR_SCORE_PREFERRED 0x0004 #define IPV6_SADDR_SCORE_HOA 0x0008 #define IPV6_SADDR_SCORE_OIF 0x0010 #define IPV6_SADDR_SCORE_LABEL 0x0020 #define IPV6_SADDR_SCORE_PRIVACY 0x0040 static int inline ipv6_saddr_preferred(int type) { if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4| IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED)) return 1; return 0; } /* static matching label */ static int inline ipv6_saddr_label(const struct in6_addr *addr, int type) { /* * prefix (longest match) label * ----------------------------- * ::1/128 0 * ::/0 1 * 2002::/16 2 * ::/96 3 * ::ffff:0:0/96 4 * fc00::/7 5 * 2001::/32 6 */ if (type & IPV6_ADDR_LOOPBACK) return 0; else if (type & IPV6_ADDR_COMPATv4) return 3; else if (type & IPV6_ADDR_MAPPED) return 4; else if (addr->s6_addr32[0] == htonl(0x20010000)) return 6; else if (addr->s6_addr16[0] == htons(0x2002)) return 2; else if ((addr->s6_addr[0] & 0xfe) == 0xfc) return 5; return 1; } int ipv6_dev_get_saddr(struct net_device *daddr_dev, struct in6_addr *daddr, struct in6_addr *saddr) { struct ipv6_saddr_score hiscore; struct inet6_ifaddr *ifa_result = NULL; int daddr_type = __ipv6_addr_type(daddr); int daddr_scope = __ipv6_addr_src_scope(daddr_type); u32 daddr_label = ipv6_saddr_label(daddr, daddr_type); struct net_device *dev; memset(&hiscore, 0, sizeof(hiscore)); read_lock(&dev_base_lock); read_lock(&addrconf_lock); for (dev = dev_base; dev; dev=dev->next) { struct inet6_dev *idev; struct inet6_ifaddr *ifa; /* Rule 0: Candidate Source Address (section 4) * - multicast and link-local destination address, * the set of candidate source address MUST only * include addresses assigned to interfaces * belonging to the same link as the outgoing * interface. * (- For site-local destination addresses, the * set of candidate source addresses MUST only * include addresses assigned to interfaces * belonging to the same site as the outgoing * interface.) */ if ((daddr_type & IPV6_ADDR_MULTICAST || daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && daddr_dev && dev != daddr_dev) continue; idev = __in6_dev_get(dev); if (!idev) continue; read_lock_bh(&idev->lock); for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) { struct ipv6_saddr_score score; score.addr_type = __ipv6_addr_type(&ifa->addr); /* Rule 0: * - Tentative Address (RFC2462 section 5.4) * - A tentative address is not considered * "assigned to an interface" in the traditional * sense. * - Candidate Source Address (section 4) * - In any case, anycast addresses, multicast * addresses, and the unspecified address MUST * NOT be included in a candidate set. */ if (ifa->flags & IFA_F_TENTATIVE) continue; if (unlikely(score.addr_type == IPV6_ADDR_ANY || score.addr_type & IPV6_ADDR_MULTICAST)) { LIMIT_NETDEBUG(KERN_DEBUG "ADDRCONF: unspecified / multicast address" "assigned as unicast address on %s", dev->name); continue; } score.attrs = 0; score.matchlen = 0; score.scope = 0; score.rule = 0; if (ifa_result == NULL) { /* record it if the first available entry */ goto record_it; } /* Rule 1: Prefer same address */ if (hiscore.rule < 1) { if (ipv6_addr_equal(&ifa_result->addr, daddr)) hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL; hiscore.rule++; } if (ipv6_addr_equal(&ifa->addr, daddr)) { score.attrs |= IPV6_SADDR_SCORE_LOCAL; if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) { score.rule = 1; goto record_it; } } else { if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL) continue; } /* Rule 2: Prefer appropriate scope */ if (hiscore.rule < 2) { hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type); hiscore.rule++; } score.scope = __ipv6_addr_src_scope(score.addr_type); if (hiscore.scope < score.scope) { if (hiscore.scope < daddr_scope) { score.rule = 2; goto record_it; } else continue; } else if (score.scope < hiscore.scope) { if (score.scope < daddr_scope) break; /* addresses sorted by scope */ else { score.rule = 2; goto record_it; } } /* Rule 3: Avoid deprecated address */ if (hiscore.rule < 3) { if (ipv6_saddr_preferred(hiscore.addr_type) || !(ifa_result->flags & IFA_F_DEPRECATED)) hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED; hiscore.rule++; } if (ipv6_saddr_preferred(score.addr_type) || !(ifa->flags & IFA_F_DEPRECATED)) { score.attrs |= IPV6_SADDR_SCORE_PREFERRED; if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) { score.rule = 3; goto record_it; } } else { if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED) continue; } /* Rule 4: Prefer home address -- not implemented yet */ if (hiscore.rule < 4) hiscore.rule++; /* Rule 5: Prefer outgoing interface */ if (hiscore.rule < 5) { if (daddr_dev == NULL || daddr_dev == ifa_result->idev->dev) hiscore.attrs |= IPV6_SADDR_SCORE_OIF; hiscore.rule++; } if (daddr_dev == NULL || daddr_dev == ifa->idev->dev) { score.attrs |= IPV6_SADDR_SCORE_OIF; if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) { score.rule = 5; goto record_it; } } else { if (hiscore.attrs & IPV6_SADDR_SCORE_OIF) continue; } /* Rule 6: Prefer matching label */ if (hiscore.rule < 6) { if (ipv6_saddr_label(&ifa_result->addr, hiscore.addr_type) == daddr_label) hiscore.attrs |= IPV6_SADDR_SCORE_LABEL; hiscore.rule++; } if (ipv6_saddr_label(&ifa->addr, score.addr_type) == daddr_label) { score.attrs |= IPV6_SADDR_SCORE_LABEL; if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) { score.rule = 6; goto record_it; } } else { if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL) continue; } #ifdef CONFIG_IPV6_PRIVACY /* Rule 7: Prefer public address * Note: prefer temprary address if use_tempaddr >= 2 */ if (hiscore.rule < 7) { if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^ (ifa_result->idev->cnf.use_tempaddr >= 2)) hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY; hiscore.rule++; } if ((!(ifa->flags & IFA_F_TEMPORARY)) ^ (ifa->idev->cnf.use_tempaddr >= 2)) { score.attrs |= IPV6_SADDR_SCORE_PRIVACY; if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) { score.rule = 7; goto record_it; } } else { if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY) continue; } #else if (hiscore.rule < 7) hiscore.rule++; #endif /* Rule 8: Use longest matching prefix */ if (hiscore.rule < 8) { hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr); hiscore.rule++; } score.matchlen = ipv6_addr_diff(&ifa->addr, daddr); if (score.matchlen > hiscore.matchlen) { score.rule = 8; goto record_it; } #if 0 else if (score.matchlen < hiscore.matchlen) continue; #endif /* Final Rule: choose first available one */ continue; record_it: if (ifa_result) in6_ifa_put(ifa_result); in6_ifa_hold(ifa); ifa_result = ifa; hiscore = score; } read_unlock_bh(&idev->lock); } read_unlock(&addrconf_lock); read_unlock(&dev_base_lock); if (!ifa_result) return -EADDRNOTAVAIL; ipv6_addr_copy(saddr, &ifa_result->addr); in6_ifa_put(ifa_result); return 0; } int ipv6_get_saddr(struct dst_entry *dst, struct in6_addr *daddr, struct in6_addr *saddr) { return ipv6_dev_get_saddr(dst ? ((struct rt6_info *)dst)->rt6i_idev->dev : NULL, daddr, saddr); } int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr) { struct inet6_dev *idev; int err = -EADDRNOTAVAIL; read_lock(&addrconf_lock); if ((idev = __in6_dev_get(dev)) != NULL) { struct inet6_ifaddr *ifp; read_lock_bh(&idev->lock); for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { ipv6_addr_copy(addr, &ifp->addr); err = 0; break; } } read_unlock_bh(&idev->lock); } read_unlock(&addrconf_lock); return err; } static int ipv6_count_addresses(struct inet6_dev *idev) { int cnt = 0; struct inet6_ifaddr *ifp; read_lock_bh(&idev->lock); for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) cnt++; read_unlock_bh(&idev->lock); return cnt; } int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict) { struct inet6_ifaddr * ifp; u8 hash = ipv6_addr_hash(addr); read_lock_bh(&addrconf_hash_lock); for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { if (ipv6_addr_equal(&ifp->addr, addr) && !(ifp->flags&IFA_F_TENTATIVE)) { if (dev == NULL || ifp->idev->dev == dev || !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) break; } } read_unlock_bh(&addrconf_hash_lock); return ifp != NULL; } static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev) { struct inet6_ifaddr * ifp; u8 hash = ipv6_addr_hash(addr); for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { if (ipv6_addr_equal(&ifp->addr, addr)) { if (dev == NULL || ifp->idev->dev == dev) break; } } return ifp != NULL; } struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict) { struct inet6_ifaddr * ifp; u8 hash = ipv6_addr_hash(addr); read_lock_bh(&addrconf_hash_lock); for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) { if (ipv6_addr_equal(&ifp->addr, addr)) { if (dev == NULL || ifp->idev->dev == dev || !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { in6_ifa_hold(ifp); break; } } } read_unlock_bh(&addrconf_hash_lock); return ifp; } int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) { const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr; const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); u32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr; u32 sk2_rcv_saddr = inet_rcv_saddr(sk2); int sk_ipv6only = ipv6_only_sock(sk); int sk2_ipv6only = inet_v6_ipv6only(sk2); int addr_type = ipv6_addr_type(sk_rcv_saddr6); int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; if (!sk2_rcv_saddr && !sk_ipv6only) return 1; if (addr_type2 == IPV6_ADDR_ANY && !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) return 1; if (addr_type == IPV6_ADDR_ANY && !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) return 1; if (sk2_rcv_saddr6 && ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6)) return 1; if (addr_type == IPV6_ADDR_MAPPED && !sk2_ipv6only && (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr)) return 1; return 0; } /* Gets referenced address, destroys ifaddr */ static void addrconf_dad_stop(struct inet6_ifaddr *ifp) { if (ifp->flags&IFA_F_PERMANENT) { spin_lock_bh(&ifp->lock); addrconf_del_timer(ifp); ifp->flags |= IFA_F_TENTATIVE; spin_unlock_bh(&ifp->lock); in6_ifa_put(ifp); #ifdef CONFIG_IPV6_PRIVACY } else if (ifp->flags&IFA_F_TEMPORARY) { struct inet6_ifaddr *ifpub; spin_lock_bh(&ifp->lock); ifpub = ifp->ifpub; if (ifpub) { in6_ifa_hold(ifpub); spin_unlock_bh(&ifp->lock); ipv6_create_tempaddr(ifpub, ifp); in6_ifa_put(ifpub); } else { spin_unlock_bh(&ifp->lock); } ipv6_del_addr(ifp); #endif } else ipv6_del_addr(ifp); } void addrconf_dad_failure(struct inet6_ifaddr *ifp) { if (net_ratelimit()) printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name); addrconf_dad_stop(ifp); } /* Join to solicited addr multicast group. */ void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr) { struct in6_addr maddr; if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) return; addrconf_addr_solict_mult(addr, &maddr); ipv6_dev_mc_inc(dev, &maddr); } void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr) { struct in6_addr maddr; if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) return; addrconf_addr_solict_mult(addr, &maddr); __ipv6_dev_mc_dec(idev, &maddr); } static void addrconf_join_anycast(struct inet6_ifaddr *ifp) { struct in6_addr addr; ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); if (ipv6_addr_any(&addr)) return; ipv6_dev_ac_inc(ifp->idev->dev, &addr); } static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) { struct in6_addr addr; ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); if (ipv6_addr_any(&addr)) return; __ipv6_dev_ac_dec(ifp->idev, &addr); } static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) { if (dev->addr_len != ETH_ALEN) return -1; memcpy(eui, dev->dev_addr, 3); memcpy(eui + 5, dev->dev_addr + 3, 3); /* * 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. */ if (dev->dev_id) { eui[3] = (dev->dev_id >> 8) & 0xFF; eui[4] = dev->dev_id & 0xFF; } else { eui[3] = 0xFF; eui[4] = 0xFE; eui[0] ^= 2; } return 0; } static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) { /* XXX: inherit EUI-64 from other interface -- yoshfuji */ if (dev->addr_len != ARCNET_ALEN) return -1; memset(eui, 0, 7); eui[7] = *(u8*)dev->dev_addr; return 0; } static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) { if (dev->addr_len != INFINIBAND_ALEN) return -1; memcpy(eui, dev->dev_addr + 12, 8); eui[0] |= 2; return 0; } static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) { switch (dev->type) { case ARPHRD_ETHER: case ARPHRD_FDDI: case ARPHRD_IEEE802_TR: return addrconf_ifid_eui48(eui, dev); case ARPHRD_ARCNET: return addrconf_ifid_arcnet(eui, dev); case ARPHRD_INFINIBAND: return addrconf_ifid_infiniband(eui, dev); } return -1; } static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) { int err = -1; struct inet6_ifaddr *ifp; read_lock_bh(&idev->lock); for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) { if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { memcpy(eui, ifp->addr.s6_addr+8, 8); err = 0; break; } } read_unlock_bh(&idev->lock); return err; } #ifdef CONFIG_IPV6_PRIVACY /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ static int __ipv6_regen_rndid(struct inet6_dev *idev) { regen: get_random_bytes(idev->rndid, sizeof(idev->rndid)); idev->rndid[0] &= ~0x02; /* * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: * check if generated address is not inappropriate * * - Reserved subnet anycast (RFC 2526) * 11111101 11....11 1xxxxxxx * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1 * 00-00-5E-FE-xx-xx-xx-xx * - value 0 * - XXX: already assigned to an address on the device */ if (idev->rndid[0] == 0xfd && (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && (idev->rndid[7]&0x80)) goto regen; if ((idev->rndid[0]|idev->rndid[1]) == 0) { if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) goto regen; if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) goto regen; } return 0; } static void ipv6_regen_rndid(unsigned long data) { struct inet6_dev *idev = (struct inet6_dev *) data; unsigned long expires; read_lock_bh(&addrconf_lock); write_lock_bh(&idev->lock); if (idev->dead) goto out; if (__ipv6_regen_rndid(idev) < 0) goto out; expires = jiffies + idev->cnf.temp_prefered_lft * HZ - idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor; if (time_before(expires, jiffies)) { printk(KERN_WARNING "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n", idev->dev->name); goto out; } if (!mod_timer(&idev->regen_timer, expires)) in6_dev_hold(idev); out: write_unlock_bh(&idev->lock); read_unlock_bh(&addrconf_lock); in6_dev_put(idev); } static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) { int ret = 0; if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) ret = __ipv6_regen_rndid(idev); return ret; } #endif /* * Add prefix route. */ static void addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, unsigned long expires, u32 flags) { struct in6_rtmsg rtmsg; memset(&rtmsg, 0, sizeof(rtmsg)); ipv6_addr_copy(&rtmsg.rtmsg_dst, pfx); rtmsg.rtmsg_dst_len = plen; rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF; rtmsg.rtmsg_ifindex = dev->ifindex; rtmsg.rtmsg_info = expires; rtmsg.rtmsg_flags = RTF_UP|flags; rtmsg.rtmsg_type = RTMSG_NEWROUTE; /* Prevent useless cloning on PtP SIT. This thing is done here expecting that the whole class of non-broadcast devices need not cloning. */ if (dev->type == ARPHRD_SIT && (dev->flags&IFF_POINTOPOINT)) rtmsg.rtmsg_flags |= RTF_NONEXTHOP; ip6_route_add(&rtmsg, NULL, NULL, NULL); } /* Create "default" multicast route to the interface */ static void addrconf_add_mroute(struct net_device *dev) { struct in6_rtmsg rtmsg; memset(&rtmsg, 0, sizeof(rtmsg)); ipv6_addr_set(&rtmsg.rtmsg_dst, htonl(0xFF000000), 0, 0, 0); rtmsg.rtmsg_dst_len = 8; rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF; rtmsg.rtmsg_ifindex = dev->ifindex; rtmsg.rtmsg_flags = RTF_UP; rtmsg.rtmsg_type = RTMSG_NEWROUTE; ip6_route_add(&rtmsg, NULL, NULL, NULL); } static void sit_route_add(struct net_device *dev) { struct in6_rtmsg rtmsg; memset(&rtmsg, 0, sizeof(rtmsg)); rtmsg.rtmsg_type = RTMSG_NEWROUTE; rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF; /* prefix length - 96 bits "::d.d.d.d" */ rtmsg.rtmsg_dst_len = 96; rtmsg.rtmsg_flags = RTF_UP|RTF_NONEXTHOP; rtmsg.rtmsg_ifindex = dev->ifindex; ip6_route_add(&rtmsg, NULL, NULL, NULL); } static void addrconf_add_lroute(struct net_device *dev) { struct in6_addr addr; ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); addrconf_prefix_route(&addr, 64, dev, 0, 0); } static struct inet6_dev *addrconf_add_dev(struct net_device *dev) { struct inet6_dev *idev; ASSERT_RTNL(); if ((idev = ipv6_find_idev(dev)) == NULL) return NULL; /* Add default multicast route */ addrconf_add_mroute(dev); /* Add link local route */ addrconf_add_lroute(dev); return idev; } void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) { struct prefix_info *pinfo; __u32 valid_lft; __u32 prefered_lft; int addr_type; unsigned long rt_expires; struct inet6_dev *in6_dev; pinfo = (struct prefix_info *) opt; if (len < sizeof(struct prefix_info)) { ADBG(("addrconf: prefix option too short\n")); return; } /* * Validation checks ([ADDRCONF], page 19) */ addr_type = ipv6_addr_type(&pinfo->prefix); if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) return; valid_lft = ntohl(pinfo->valid); prefered_lft = ntohl(pinfo->prefered); if (prefered_lft > valid_lft) { if (net_ratelimit()) printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n"); return; } in6_dev = in6_dev_get(dev); if (in6_dev == NULL) { if (net_ratelimit()) printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name); return; } /* * Two things going on here: * 1) Add routes for on-link prefixes * 2) Configure prefixes with the auto flag set */ /* Avoid arithmetic overflow. Really, we could save rt_expires in seconds, likely valid_lft, but it would require division in fib gc, that it not good. */ if (valid_lft >= 0x7FFFFFFF/HZ) rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ); else rt_expires = valid_lft * HZ; /* * We convert this (in jiffies) to clock_t later. * Avoid arithmetic overflow there as well. * Overflow can happen only if HZ < USER_HZ. */ if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ) rt_expires = 0x7FFFFFFF / USER_HZ; if (pinfo->onlink) { struct rt6_info *rt; rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1); if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) { if (rt->rt6i_flags&RTF_EXPIRES) { if (valid_lft == 0) { ip6_del_rt(rt, NULL, NULL, NULL); rt = NULL; } else { rt->rt6i_expires = jiffies + rt_expires; } } } else if (valid_lft) { addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT); } if (rt) dst_release(&rt->u.dst); } /* Try to figure out our local address for this prefix */ if (pinfo->autoconf && in6_dev->cnf.autoconf) { struct inet6_ifaddr * ifp; struct in6_addr addr; int create = 0, update_lft = 0; if (pinfo->prefix_len == 64) { memcpy(&addr, &pinfo->prefix, 8); if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { in6_dev_put(in6_dev); return; } goto ok; } if (net_ratelimit()) printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n", pinfo->prefix_len); in6_dev_put(in6_dev); return; ok: ifp = ipv6_get_ifaddr(&addr, dev, 1); if (ifp == NULL && valid_lft) { int max_addresses = in6_dev->cnf.max_addresses; /* Do not allow to create too much of autoconfigured * addresses; this would be too easy way to crash kernel. */ if (!max_addresses || ipv6_count_addresses(in6_dev) < max_addresses) ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, addr_type&IPV6_ADDR_SCOPE_MASK, 0); if (!ifp || IS_ERR(ifp)) { in6_dev_put(in6_dev); return; } update_lft = create = 1; ifp->cstamp = jiffies; addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT); } if (ifp) { int flags; unsigned long now; #ifdef CONFIG_IPV6_PRIVACY struct inet6_ifaddr *ift; #endif u32 stored_lft; /* update lifetime (RFC2462 5.5.3 e) */ spin_lock(&ifp->lock); now = jiffies; if (ifp->valid_lft > (now - ifp->tstamp) / HZ) stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; else stored_lft = 0; if (!update_lft && stored_lft) { if (valid_lft > MIN_VALID_LIFETIME || valid_lft > stored_lft) update_lft = 1; else if (stored_lft <= MIN_VALID_LIFETIME) { /* valid_lft <= stored_lft is always true */ /* XXX: IPsec */ update_lft = 0; } else { valid_lft = MIN_VALID_LIFETIME; if (valid_lft < prefered_lft) prefered_lft = valid_lft; update_lft = 1; } } if (update_lft) { ifp->valid_lft = valid_lft; ifp->prefered_lft = prefered_lft; ifp->tstamp = now; flags = ifp->flags; ifp->flags &= ~IFA_F_DEPRECATED; spin_unlock(&ifp->lock); if (!(flags&IFA_F_TENTATIVE)) ipv6_ifa_notify(0, ifp); } else spin_unlock(&ifp->lock); #ifdef CONFIG_IPV6_PRIVACY read_lock_bh(&in6_dev->lock); /* update all temporary addresses in the list */ for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) { /* * When adjusting the lifetimes of an existing * temporary address, only lower the lifetimes. * Implementations must not increase the * lifetimes of an existing temporary address * when processing a Prefix Information Option. */ spin_lock(&ift->lock); flags = ift->flags; if (ift->valid_lft > valid_lft && ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ) ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ; if (ift->prefered_lft > prefered_lft && ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ) ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ; spin_unlock(&ift->lock); if (!(flags&IFA_F_TENTATIVE)) ipv6_ifa_notify(0, ift); } if (create && in6_dev->cnf.use_tempaddr > 0) { /* * When a new public address is created as described in [ADDRCONF], * also create a new temporary address. */ read_unlock_bh(&in6_dev->lock); ipv6_create_tempaddr(ifp, NULL); } else { read_unlock_bh(&in6_dev->lock); } #endif in6_ifa_put(ifp); addrconf_verify(0); } } inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); in6_dev_put(in6_dev); } /* * Set destination address. * Special case for SIT interfaces where we create a new "virtual" * device. */ int addrconf_set_dstaddr(void __user *arg) { struct in6_ifreq ireq; struct net_device *dev; int err = -EINVAL; rtnl_lock(); err = -EFAULT; if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) goto err_exit; dev = __dev_get_by_index(ireq.ifr6_ifindex); err = -ENODEV; if (dev == NULL) goto err_exit; if (dev->type == ARPHRD_SIT) { struct ifreq ifr; mm_segment_t oldfs; struct ip_tunnel_parm p; err = -EADDRNOTAVAIL; if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) goto err_exit; memset(&p, 0, sizeof(p)); p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; p.iph.saddr = 0; p.iph.version = 4; p.iph.ihl = 5; p.iph.protocol = IPPROTO_IPV6; p.iph.ttl = 64; ifr.ifr_ifru.ifru_data = (void __user *)&p; oldfs = get_fs(); set_fs(KERNEL_DS); err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL); set_fs(oldfs); if (err == 0) { err = -ENOBUFS; if ((dev = __dev_get_by_name(p.name)) == NULL) goto err_exit; err = dev_open(dev); } } err_exit: rtnl_unlock(); return err; } /* * Manual configuration of address on an interface */ static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen, __u32 prefered_lft, __u32 valid_lft) { struct inet6_ifaddr *ifp; struct inet6_dev *idev; struct net_device *dev; __u8 ifa_flags = 0; int scope; ASSERT_RTNL(); /* check the lifetime */ if (!valid_lft || prefered_lft > valid_lft) return -EINVAL; if ((dev = __dev_get_by_index(ifindex)) == NULL) return -ENODEV; if (!(dev->flags&IFF_UP)) return -ENETDOWN; if ((idev = addrconf_add_dev(dev)) == NULL) return -ENOBUFS; scope = ipv6_addr_scope(pfx); if (valid_lft == INFINITY_LIFE_TIME) ifa_flags |= IFA_F_PERMANENT; else if (valid_lft >= 0x7FFFFFFF/HZ) valid_lft = 0x7FFFFFFF/HZ; if (prefered_lft == 0) ifa_flags |= IFA_F_DEPRECATED; else if ((prefered_lft >= 0x7FFFFFFF/HZ) && (prefered_lft != INFINITY_LIFE_TIME)) prefered_lft = 0x7FFFFFFF/HZ; ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); if (!IS_ERR(ifp)) { spin_lock(&ifp->lock); ifp->valid_lft = valid_lft; ifp->prefered_lft = prefered_lft; ifp->tstamp = jiffies; spin_unlock(&ifp->lock); addrconf_dad_start(ifp, 0); in6_ifa_put(ifp); addrconf_verify(0); return 0; } return PTR_ERR(ifp); } static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen) { struct inet6_ifaddr *ifp; struct inet6_dev *idev; struct net_device *dev; if ((dev = __dev_get_by_index(ifindex)) == NULL) return -ENODEV; if ((idev = __in6_dev_get(dev)) == NULL) return -ENXIO; read_lock_bh(&idev->lock); for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) { if (ifp->prefix_len == plen && ipv6_addr_equal(pfx, &ifp->addr)) { in6_ifa_hold(ifp); read_unlock_bh(&idev->lock); ipv6_del_addr(ifp); /* If the last address is deleted administratively, disable IPv6 on this interface. */ if (idev->addr_list == NULL) addrconf_ifdown(idev->dev, 1); return 0; } } read_unlock_bh(&idev->lock); return -EADDRNOTAVAIL; } int addrconf_add_ifaddr(void __user *arg) { struct in6_ifreq ireq; int err; if (!capable(CAP_NET_ADMIN)) return -EPERM; if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) return -EFAULT; rtnl_lock(); err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); rtnl_unlock(); return err; } int addrconf_del_ifaddr(void __user *arg) { struct in6_ifreq ireq; int err; if (!capable(CAP_NET_ADMIN)) return -EPERM; if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) return -EFAULT; rtnl_lock(); err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen); rtnl_unlock(); return err; } static void sit_add_v4_addrs(struct inet6_dev *idev) { struct inet6_ifaddr * ifp; struct in6_addr addr; struct net_device *dev; int scope; ASSERT_RTNL(); memset(&addr, 0, sizeof(struct in6_addr)); memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); if (idev->dev->flags&IFF_POINTOPOINT) { addr.s6_addr32[0] = htonl(0xfe800000); scope = IFA_LINK; } else { scope = IPV6_ADDR_COMPATv4; } if (addr.s6_addr32[3]) { ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT); if (!IS_ERR(ifp)) { spin_lock_bh(&ifp->lock); ifp->flags &= ~IFA_F_TENTATIVE; spin_unlock_bh(&ifp->lock); ipv6_ifa_notify(RTM_NEWADDR, ifp); in6_ifa_put(ifp); } return; } for (dev = dev_base; dev != NULL; dev = dev->next) { struct in_device * in_dev = __in_dev_get_rtnl(dev); if (in_dev && (dev->flags & IFF_UP)) { struct in_ifaddr * ifa; int flag = scope; for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { int plen; addr.s6_addr32[3] = ifa->ifa_local; if (ifa->ifa_scope == RT_SCOPE_LINK) continue; if (ifa->ifa_scope >= RT_SCOPE_HOST) { if (idev->dev->flags&IFF_POINTOPOINT) continue; flag |= IFA_HOST; } if (idev->dev->flags&IFF_POINTOPOINT) plen = 64; else plen = 96; ifp = ipv6_add_addr(idev, &addr, plen, flag, IFA_F_PERMANENT); if (!IS_ERR(ifp)) { spin_lock_bh(&ifp->lock); ifp->flags &= ~IFA_F_TENTATIVE; spin_unlock_bh(&ifp->lock); ipv6_ifa_notify(RTM_NEWADDR, ifp); in6_ifa_put(ifp); } } } } } static void init_loopback(struct net_device *dev) { struct inet6_dev *idev; struct inet6_ifaddr * ifp; /* ::1 */ ASSERT_RTNL(); if ((idev = ipv6_find_idev(dev)) == NULL) { printk(KERN_DEBUG "init loopback: add_dev failed\n"); return; } ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT); if (!IS_ERR(ifp)) { spin_lock_bh(&ifp->lock); ifp->flags &= ~IFA_F_TENTATIVE; spin_unlock_bh(&ifp->lock); ipv6_ifa_notify(RTM_NEWADDR, ifp); in6_ifa_put(ifp); } } static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr) { struct inet6_ifaddr * ifp; ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, IFA_F_PERMANENT); if (!IS_ERR(ifp)) { addrconf_dad_start(ifp, 0); in6_ifa_put(ifp); } } static void addrconf_dev_config(struct net_device *dev) { struct in6_addr addr; struct inet6_dev * idev; ASSERT_RTNL(); if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_FDDI) && (dev->type != ARPHRD_IEEE802_TR) && (dev->type != ARPHRD_ARCNET) && (dev->type != ARPHRD_INFINIBAND)) { /* Alas, we support only Ethernet autoconfiguration. */ return; } idev = addrconf_add_dev(dev); if (idev == NULL) return; memset(&addr, 0, sizeof(struct in6_addr)); addr.s6_addr32[0] = htonl(0xFE800000); if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) addrconf_add_linklocal(idev, &addr); } static void addrconf_sit_config(struct net_device *dev) { struct inet6_dev *idev; ASSERT_RTNL(); /* * Configure the tunnel with one of our IPv4 * addresses... we should configure all of * our v4 addrs in the tunnel */ if ((idev = ipv6_find_idev(dev)) == NULL) { printk(KERN_DEBUG "init sit: add_dev failed\n"); return; } sit_add_v4_addrs(idev); if (dev->flags&IFF_POINTOPOINT) { addrconf_add_mroute(dev); addrconf_add_lroute(dev); } else sit_route_add(dev); } static inline int ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) { struct in6_addr lladdr; if (!ipv6_get_lladdr(link_dev, &lladdr)) { addrconf_add_linklocal(idev, &lladdr); return 0; } return -1; } static void ip6_tnl_add_linklocal(struct inet6_dev *idev) { struct net_device *link_dev; /* first try to inherit the link-local address from the link device */ if (idev->dev->iflink && (link_dev = __dev_get_by_index(idev->dev->iflink))) { if (!ipv6_inherit_linklocal(idev, link_dev)) return; } /* then try to inherit it from any device */ for (link_dev = dev_base; link_dev; link_dev = link_dev->next) { if (!ipv6_inherit_linklocal(idev, link_dev)) return; } printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n"); } /* * Autoconfigure tunnel with a link-local address so routing protocols, * DHCPv6, MLD etc. can be run over the virtual link */ static void addrconf_ip6_tnl_config(struct net_device *dev) { struct inet6_dev *idev; ASSERT_RTNL(); if ((idev = addrconf_add_dev(dev)) == NULL) { printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n"); return; } ip6_tnl_add_linklocal(idev); } static int addrconf_notify(struct notifier_block *this, unsigned long event, void * data) { struct net_device *dev = (struct net_device *) data; struct inet6_dev *idev = __in6_dev_get(dev); int run_pending = 0; switch(event) { case NETDEV_UP: case NETDEV_CHANGE: if (event == NETDEV_UP) { if (!netif_carrier_ok(dev)) { /* device is not ready yet. */ printk(KERN_INFO "ADDRCONF(NETDEV_UP): %s: " "link is not ready\n", dev->name); break; } if (idev) idev->if_flags |= IF_READY; } else { if (!netif_carrier_ok(dev)) { /* device is still not ready. */ break; } if (idev) { if (idev->if_flags & IF_READY) { /* device is already configured. */ break; } idev->if_flags |= IF_READY; } printk(KERN_INFO "ADDRCONF(NETDEV_CHANGE): %s: " "link becomes ready\n", dev->name); run_pending = 1; } switch(dev->type) { case ARPHRD_SIT: addrconf_sit_config(dev); break; case ARPHRD_TUNNEL6: addrconf_ip6_tnl_config(dev); break; case ARPHRD_LOOPBACK: init_loopback(dev); break; default: addrconf_dev_config(dev); break; }; if (idev) { if (run_pending) addrconf_dad_run(idev); /* If the MTU changed during the interface down, when the interface up, the changed MTU must be reflected in the idev as well as routers. */ if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) { rt6_mtu_change(dev, dev->mtu); idev->cnf.mtu6 = dev->mtu; } idev->tstamp = jiffies; inet6_ifinfo_notify(RTM_NEWLINK, idev); /* If the changed mtu during down is lower than IPV6_MIN_MTU stop IPv6 on this interface. */ if (dev->mtu < IPV6_MIN_MTU) addrconf_ifdown(dev, event != NETDEV_DOWN); } break; case NETDEV_CHANGEMTU: if ( idev && dev->mtu >= IPV6_MIN_MTU) { rt6_mtu_change(dev, dev->mtu); idev->cnf.mtu6 = dev->mtu; break; } /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */ case NETDEV_DOWN: case NETDEV_UNREGISTER: /* * Remove all addresses from this interface. */ addrconf_ifdown(dev, event != NETDEV_DOWN); break; case NETDEV_CHANGENAME: #ifdef CONFIG_SYSCTL if (idev) { addrconf_sysctl_unregister(&idev->cnf); neigh_sysctl_unregister(idev->nd_parms); neigh_sysctl_register(dev, idev->nd_parms, NET_IPV6, NET_IPV6_NEIGH, "ipv6", &ndisc_ifinfo_sysctl_change, NULL); addrconf_sysctl_register(idev, &idev->cnf); } #endif break; }; return NOTIFY_OK; } /* * addrconf module should be notified of a device going up */ static struct notifier_block ipv6_dev_notf = { .notifier_call = addrconf_notify, .priority = 0 }; static int addrconf_ifdown(struct net_device *dev, int how) { struct inet6_dev *idev; struct inet6_ifaddr *ifa, **bifa; int i; ASSERT_RTNL(); if (dev == &loopback_dev && how == 1) how = 0; rt6_ifdown(dev); neigh_ifdown(&nd_tbl, dev); idev = __in6_dev_get(dev); if (idev == NULL) return -ENODEV; /* Step 1: remove reference to ipv6 device from parent device. Do not dev_put! */ if (how == 1) { write_lock_bh(&addrconf_lock); dev->ip6_ptr = NULL; idev->dead = 1; write_unlock_bh(&addrconf_lock); /* Step 1.5: remove snmp6 entry */ snmp6_unregister_dev(idev); } /* Step 2: clear hash table */ for (i=0; i<IN6_ADDR_HSIZE; i++) { bifa = &inet6_addr_lst[i]; write_lock_bh(&addrconf_hash_lock); while ((ifa = *bifa) != NULL) { if (ifa->idev == idev) { *bifa = ifa->lst_next; ifa->lst_next = NULL; addrconf_del_timer(ifa); in6_ifa_put(ifa); continue; } bifa = &ifa->lst_next; } write_unlock_bh(&addrconf_hash_lock); } write_lock_bh(&idev->lock); /* Step 3: clear flags for stateless addrconf */ if (how != 1) idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); /* Step 4: clear address list */ #ifdef CONFIG_IPV6_PRIVACY if (how == 1 && del_timer(&idev->regen_timer)) in6_dev_put(idev); /* clear tempaddr list */ while ((ifa = idev->tempaddr_list) != NULL) { idev->tempaddr_list = ifa->tmp_next; ifa->tmp_next = NULL; ifa->dead = 1; write_unlock_bh(&idev->lock); spin_lock_bh(&ifa->lock); if (ifa->ifpub) { in6_ifa_put(ifa->ifpub); ifa->ifpub = NULL; } spin_unlock_bh(&ifa->lock); in6_ifa_put(ifa); write_lock_bh(&idev->lock); } #endif while ((ifa = idev->addr_list) != NULL) { idev->addr_list = ifa->if_next; ifa->if_next = NULL; ifa->dead = 1; addrconf_del_timer(ifa); write_unlock_bh(&idev->lock); __ipv6_ifa_notify(RTM_DELADDR, ifa); in6_ifa_put(ifa); write_lock_bh(&idev->lock); } write_unlock_bh(&idev->lock); /* Step 5: Discard multicast list */ if (how == 1) ipv6_mc_destroy_dev(idev); else ipv6_mc_down(idev); /* Step 5: netlink notification of this interface */ idev->tstamp = jiffies; inet6_ifinfo_notify(RTM_DELLINK, idev); /* Shot the device (if unregistered) */ if (how == 1) { #ifdef CONFIG_SYSCTL addrconf_sysctl_unregister(&idev->cnf); neigh_sysctl_unregister(idev->nd_parms); #endif neigh_parms_release(&nd_tbl, idev->nd_parms); neigh_ifdown(&nd_tbl, dev); in6_dev_put(idev); } return 0; } static void addrconf_rs_timer(unsigned long data) { struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; if (ifp->idev->cnf.forwarding) goto out; if (ifp->idev->if_flags & IF_RA_RCVD) { /* * Announcement received after solicitation * was sent */ goto out; } spin_lock(&ifp->lock); if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) { struct in6_addr all_routers; /* The wait after the last probe can be shorter */ addrconf_mod_timer(ifp, AC_RS, (ifp->probes == ifp->idev->cnf.rtr_solicits) ? ifp->idev->cnf.rtr_solicit_delay : ifp->idev->cnf.rtr_solicit_interval); spin_unlock(&ifp->lock); ipv6_addr_all_routers(&all_routers); ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers); } else { spin_unlock(&ifp->lock); /* * Note: we do not support deprecated "all on-link" * assumption any longer. */ printk(KERN_DEBUG "%s: no IPv6 routers present\n", ifp->idev->dev->name); } out: in6_ifa_put(ifp); } /* * Duplicate Address Detection */ static void addrconf_dad_kick(struct inet6_ifaddr *ifp) { unsigned long rand_num; struct inet6_dev *idev = ifp->idev; rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); ifp->probes = idev->cnf.dad_transmits; addrconf_mod_timer(ifp, AC_DAD, rand_num); } static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) { struct inet6_dev *idev = ifp->idev; struct net_device *dev = idev->dev; addrconf_join_solict(dev, &ifp->addr); if (ifp->prefix_len != 128 && (ifp->flags&IFA_F_PERMANENT)) addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 0, flags); net_srandom(ifp->addr.s6_addr32[3]); read_lock_bh(&idev->lock); if (ifp->dead) goto out; spin_lock_bh(&ifp->lock); if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || !(ifp->flags&IFA_F_TENTATIVE)) { ifp->flags &= ~IFA_F_TENTATIVE; spin_unlock_bh(&ifp->lock); read_unlock_bh(&idev->lock); addrconf_dad_completed(ifp); return; } if (!(idev->if_flags & IF_READY)) { spin_unlock_bh(&ifp->lock); read_unlock_bh(&idev->lock); /* * If the defice is not ready: * - keep it tentative if it is a permanent address. * - otherwise, kill it. */ in6_ifa_hold(ifp); addrconf_dad_stop(ifp); return; } addrconf_dad_kick(ifp); spin_unlock_bh(&ifp->lock); out: read_unlock_bh(&idev->lock); } static void addrconf_dad_timer(unsigned long data) { struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; struct inet6_dev *idev = ifp->idev; struct in6_addr unspec; struct in6_addr mcaddr; read_lock_bh(&idev->lock); if (idev->dead) { read_unlock_bh(&idev->lock); goto out; } spin_lock_bh(&ifp->lock); if (ifp->probes == 0) { /* * DAD was successful */ ifp->flags &= ~IFA_F_TENTATIVE; spin_unlock_bh(&ifp->lock); read_unlock_bh(&idev->lock); addrconf_dad_completed(ifp); goto out; } ifp->probes--; addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); spin_unlock_bh(&ifp->lock); read_unlock_bh(&idev->lock); /* send a neighbour solicitation for our addr */ memset(&unspec, 0, sizeof(unspec)); addrconf_addr_solict_mult(&ifp->addr, &mcaddr); ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec); out: in6_ifa_put(ifp); } static void addrconf_dad_completed(struct inet6_ifaddr *ifp) { struct net_device * dev = ifp->idev->dev; /* * Configure the address for reception. Now it is valid. */ ipv6_ifa_notify(RTM_NEWADDR, ifp); /* If added prefix is link local and forwarding is off, start sending router solicitations. */ if (ifp->idev->cnf.forwarding == 0 && ifp->idev->cnf.rtr_solicits > 0 && (dev->flags&IFF_LOOPBACK) == 0 && (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { struct in6_addr all_routers; ipv6_addr_all_routers(&all_routers); /* * If a host as already performed a random delay * [...] as part of DAD [...] there is no need * to delay again before sending the first RS */ ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers); spin_lock_bh(&ifp->lock); ifp->probes = 1; ifp->idev->if_flags |= IF_RS_SENT; addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); spin_unlock_bh(&ifp->lock); } } static void addrconf_dad_run(struct inet6_dev *idev) { struct inet6_ifaddr *ifp; read_lock_bh(&idev->lock); for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) { spin_lock_bh(&ifp->lock); if (!(ifp->flags & IFA_F_TENTATIVE)) { spin_unlock_bh(&ifp->lock); continue; } spin_unlock_bh(&ifp->lock); addrconf_dad_kick(ifp); } read_unlock_bh(&idev->lock); } #ifdef CONFIG_PROC_FS struct if6_iter_state { int bucket; }; static struct inet6_ifaddr *if6_get_first(struct seq_file *seq) { struct inet6_ifaddr *ifa = NULL; struct if6_iter_state *state = seq->private; for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { ifa = inet6_addr_lst[state->bucket]; if (ifa) break; } return ifa; } static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa) { struct if6_iter_state *state = seq->private; ifa = ifa->lst_next; try_again: if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) { ifa = inet6_addr_lst[state->bucket]; goto try_again; } return ifa; } static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos) { struct inet6_ifaddr *ifa = if6_get_first(seq); if (ifa) while(pos && (ifa = if6_get_next(seq, ifa)) != NULL) --pos; return pos ? NULL : ifa; } static void *if6_seq_start(struct seq_file *seq, loff_t *pos) { read_lock_bh(&addrconf_hash_lock); return if6_get_idx(seq, *pos); } static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) { struct inet6_ifaddr *ifa; ifa = if6_get_next(seq, v); ++*pos; return ifa; } static void if6_seq_stop(struct seq_file *seq, void *v) { read_unlock_bh(&addrconf_hash_lock); } static int if6_seq_show(struct seq_file *seq, void *v) { struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; seq_printf(seq, NIP6_SEQFMT " %02x %02x %02x %02x %8s\n", NIP6(ifp->addr), ifp->idev->dev->ifindex, ifp->prefix_len, ifp->scope, ifp->flags, ifp->idev->dev->name); return 0; } static struct seq_operations if6_seq_ops = { .start = if6_seq_start, .next = if6_seq_next, .show = if6_seq_show, .stop = if6_seq_stop, }; static int if6_seq_open(struct inode *inode, struct file *file) { struct seq_file *seq; int rc = -ENOMEM; struct if6_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL); if (!s) goto out; rc = seq_open(file, &if6_seq_ops); if (rc) goto out_kfree; seq = file->private_data; seq->private = s; out: return rc; out_kfree: kfree(s); goto out; } static struct file_operations if6_fops = { .owner = THIS_MODULE, .open = if6_seq_open, .read = seq_read, .llseek = seq_lseek, .release = seq_release_private, }; int __init if6_proc_init(void) { if (!proc_net_fops_create("if_inet6", S_IRUGO, &if6_fops)) return -ENOMEM; return 0; } void if6_proc_exit(void) { proc_net_remove("if_inet6"); } #endif /* CONFIG_PROC_FS */ /* * Periodic address status verification */ static void addrconf_verify(unsigned long foo) { struct inet6_ifaddr *ifp; unsigned long now, next; int i; spin_lock_bh(&addrconf_verify_lock); now = jiffies; next = now + ADDR_CHECK_FREQUENCY; del_timer(&addr_chk_timer); for (i=0; i < IN6_ADDR_HSIZE; i++) { restart: read_lock(&addrconf_hash_lock); for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) { unsigned long age; #ifdef CONFIG_IPV6_PRIVACY unsigned long regen_advance; #endif if (ifp->flags & IFA_F_PERMANENT) continue; spin_lock(&ifp->lock); age = (now - ifp->tstamp) / HZ; #ifdef CONFIG_IPV6_PRIVACY regen_advance = ifp->idev->cnf.regen_max_retry * ifp->idev->cnf.dad_transmits * ifp->idev->nd_parms->retrans_time / HZ; #endif if (ifp->valid_lft != INFINITY_LIFE_TIME && age >= ifp->valid_lft) { spin_unlock(&ifp->lock); in6_ifa_hold(ifp); read_unlock(&addrconf_hash_lock); ipv6_del_addr(ifp); goto restart; } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { spin_unlock(&ifp->lock); continue; } else if (age >= ifp->prefered_lft) { /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */ int deprecate = 0; if (!(ifp->flags&IFA_F_DEPRECATED)) { deprecate = 1; ifp->flags |= IFA_F_DEPRECATED; } if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) next = ifp->tstamp + ifp->valid_lft * HZ; spin_unlock(&ifp->lock); if (deprecate) { in6_ifa_hold(ifp); read_unlock(&addrconf_hash_lock); ipv6_ifa_notify(0, ifp); in6_ifa_put(ifp); goto restart; } #ifdef CONFIG_IPV6_PRIVACY } else if ((ifp->flags&IFA_F_TEMPORARY) && !(ifp->flags&IFA_F_TENTATIVE)) { if (age >= ifp->prefered_lft - regen_advance) { struct inet6_ifaddr *ifpub = ifp->ifpub; if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) next = ifp->tstamp + ifp->prefered_lft * HZ; if (!ifp->regen_count && ifpub) { ifp->regen_count++; in6_ifa_hold(ifp); in6_ifa_hold(ifpub); spin_unlock(&ifp->lock); read_unlock(&addrconf_hash_lock); spin_lock(&ifpub->lock); ifpub->regen_count = 0; spin_unlock(&ifpub->lock); ipv6_create_tempaddr(ifpub, ifp); in6_ifa_put(ifpub); in6_ifa_put(ifp); goto restart; } } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; spin_unlock(&ifp->lock); #endif } else { /* ifp->prefered_lft <= ifp->valid_lft */ if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) next = ifp->tstamp + ifp->prefered_lft * HZ; spin_unlock(&ifp->lock); } } read_unlock(&addrconf_hash_lock); } addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next; add_timer(&addr_chk_timer); spin_unlock_bh(&addrconf_verify_lock); } static int inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) { struct rtattr **rta = arg; struct ifaddrmsg *ifm = NLMSG_DATA(nlh); struct in6_addr *pfx; pfx = NULL; if (rta[IFA_ADDRESS-1]) { if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx)) return -EINVAL; pfx = RTA_DATA(rta[IFA_ADDRESS-1]); } if (rta[IFA_LOCAL-1]) { if (RTA_PAYLOAD(rta[IFA_LOCAL-1]) < sizeof(*pfx) || (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))) return -EINVAL; pfx = RTA_DATA(rta[IFA_LOCAL-1]); } if (pfx == NULL) return -EINVAL; return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen); } static int inet6_addr_modify(int ifindex, struct in6_addr *pfx, __u32 prefered_lft, __u32 valid_lft) { struct inet6_ifaddr *ifp = NULL; struct net_device *dev; int ifa_flags = 0; if ((dev = __dev_get_by_index(ifindex)) == NULL) return -ENODEV; if (!(dev->flags&IFF_UP)) return -ENETDOWN; if (!valid_lft || (prefered_lft > valid_lft)) return -EINVAL; ifp = ipv6_get_ifaddr(pfx, dev, 1); if (ifp == NULL) return -ENOENT; if (valid_lft == INFINITY_LIFE_TIME) ifa_flags = IFA_F_PERMANENT; else if (valid_lft >= 0x7FFFFFFF/HZ) valid_lft = 0x7FFFFFFF/HZ; if (prefered_lft == 0) ifa_flags = IFA_F_DEPRECATED; else if ((prefered_lft >= 0x7FFFFFFF/HZ) && (prefered_lft != INFINITY_LIFE_TIME)) prefered_lft = 0x7FFFFFFF/HZ; spin_lock_bh(&ifp->lock); ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED|IFA_F_PERMANENT)) | ifa_flags; ifp->tstamp = jiffies; ifp->valid_lft = valid_lft; ifp->prefered_lft = prefered_lft; spin_unlock_bh(&ifp->lock); if (!(ifp->flags&IFA_F_TENTATIVE)) ipv6_ifa_notify(0, ifp); in6_ifa_put(ifp); addrconf_verify(0); return 0; } static int inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) { struct rtattr **rta = arg; struct ifaddrmsg *ifm = NLMSG_DATA(nlh); struct in6_addr *pfx; __u32 valid_lft = INFINITY_LIFE_TIME, prefered_lft = INFINITY_LIFE_TIME; pfx = NULL; if (rta[IFA_ADDRESS-1]) { if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*pfx)) return -EINVAL; pfx = RTA_DATA(rta[IFA_ADDRESS-1]); } if (rta[IFA_LOCAL-1]) { if (RTA_PAYLOAD(rta[IFA_LOCAL-1]) < sizeof(*pfx) || (pfx && memcmp(pfx, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*pfx)))) return -EINVAL; pfx = RTA_DATA(rta[IFA_LOCAL-1]); } if (pfx == NULL) return -EINVAL; if (rta[IFA_CACHEINFO-1]) { struct ifa_cacheinfo *ci; if (RTA_PAYLOAD(rta[IFA_CACHEINFO-1]) < sizeof(*ci)) return -EINVAL; ci = RTA_DATA(rta[IFA_CACHEINFO-1]); valid_lft = ci->ifa_valid; prefered_lft = ci->ifa_prefered; } if (nlh->nlmsg_flags & NLM_F_REPLACE) { int ret; ret = inet6_addr_modify(ifm->ifa_index, pfx, prefered_lft, valid_lft); if (ret == 0 || !(nlh->nlmsg_flags & NLM_F_CREATE)) return ret; } return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen, prefered_lft, valid_lft); } /* Maximum length of ifa_cacheinfo attributes */ #define INET6_IFADDR_RTA_SPACE \ RTA_SPACE(16) /* IFA_ADDRESS */ + \ RTA_SPACE(sizeof(struct ifa_cacheinfo)) /* CACHEINFO */ static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, u32 pid, u32 seq, int event, unsigned int flags) { struct ifaddrmsg *ifm; struct nlmsghdr *nlh; struct ifa_cacheinfo ci; unsigned char *b = skb->tail; nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags); ifm = NLMSG_DATA(nlh); ifm->ifa_family = AF_INET6; ifm->ifa_prefixlen = ifa->prefix_len; ifm->ifa_flags = ifa->flags; ifm->ifa_scope = RT_SCOPE_UNIVERSE; if (ifa->scope&IFA_HOST) ifm->ifa_scope = RT_SCOPE_HOST; else if (ifa->scope&IFA_LINK) ifm->ifa_scope = RT_SCOPE_LINK; else if (ifa->scope&IFA_SITE) ifm->ifa_scope = RT_SCOPE_SITE; ifm->ifa_index = ifa->idev->dev->ifindex; RTA_PUT(skb, IFA_ADDRESS, 16, &ifa->addr); if (!(ifa->flags&IFA_F_PERMANENT)) { ci.ifa_prefered = ifa->prefered_lft; ci.ifa_valid = ifa->valid_lft; if (ci.ifa_prefered != INFINITY_LIFE_TIME) { long tval = (jiffies - ifa->tstamp)/HZ; ci.ifa_prefered -= tval; if (ci.ifa_valid != INFINITY_LIFE_TIME) ci.ifa_valid -= tval; } } else { ci.ifa_prefered = INFINITY_LIFE_TIME; ci.ifa_valid = INFINITY_LIFE_TIME; } ci.cstamp = (__u32)(TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) / HZ * 100 + TIME_DELTA(ifa->cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); ci.tstamp = (__u32)(TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) / HZ * 100 + TIME_DELTA(ifa->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci); nlh->nlmsg_len = skb->tail - b; return skb->len; nlmsg_failure: rtattr_failure: skb_trim(skb, b - skb->data); return -1; } static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, u32 pid, u32 seq, int event, u16 flags) { struct ifaddrmsg *ifm; struct nlmsghdr *nlh; struct ifa_cacheinfo ci; unsigned char *b = skb->tail; nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags); ifm = NLMSG_DATA(nlh); ifm->ifa_family = AF_INET6; ifm->ifa_prefixlen = 128; ifm->ifa_flags = IFA_F_PERMANENT; ifm->ifa_scope = RT_SCOPE_UNIVERSE; if (ipv6_addr_scope(&ifmca->mca_addr)&IFA_SITE) ifm->ifa_scope = RT_SCOPE_SITE; ifm->ifa_index = ifmca->idev->dev->ifindex; RTA_PUT(skb, IFA_MULTICAST, 16, &ifmca->mca_addr); ci.cstamp = (__u32)(TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) / HZ * 100 + TIME_DELTA(ifmca->mca_cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); ci.tstamp = (__u32)(TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) / HZ * 100 + TIME_DELTA(ifmca->mca_tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); ci.ifa_prefered = INFINITY_LIFE_TIME; ci.ifa_valid = INFINITY_LIFE_TIME; RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci); nlh->nlmsg_len = skb->tail - b; return skb->len; nlmsg_failure: rtattr_failure: skb_trim(skb, b - skb->data); return -1; } static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, u32 pid, u32 seq, int event, unsigned int flags) { struct ifaddrmsg *ifm; struct nlmsghdr *nlh; struct ifa_cacheinfo ci; unsigned char *b = skb->tail; nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*ifm), flags); ifm = NLMSG_DATA(nlh); ifm->ifa_family = AF_INET6; ifm->ifa_prefixlen = 128; ifm->ifa_flags = IFA_F_PERMANENT; ifm->ifa_scope = RT_SCOPE_UNIVERSE; if (ipv6_addr_scope(&ifaca->aca_addr)&IFA_SITE) ifm->ifa_scope = RT_SCOPE_SITE; ifm->ifa_index = ifaca->aca_idev->dev->ifindex; RTA_PUT(skb, IFA_ANYCAST, 16, &ifaca->aca_addr); ci.cstamp = (__u32)(TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) / HZ * 100 + TIME_DELTA(ifaca->aca_cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); ci.tstamp = (__u32)(TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) / HZ * 100 + TIME_DELTA(ifaca->aca_tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); ci.ifa_prefered = INFINITY_LIFE_TIME; ci.ifa_valid = INFINITY_LIFE_TIME; RTA_PUT(skb, IFA_CACHEINFO, sizeof(ci), &ci); nlh->nlmsg_len = skb->tail - b; return skb->len; nlmsg_failure: rtattr_failure: skb_trim(skb, b - skb->data); return -1; } enum addr_type_t { UNICAST_ADDR, MULTICAST_ADDR, ANYCAST_ADDR, }; static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, enum addr_type_t type) { int idx, ip_idx; int s_idx, s_ip_idx; int err = 1; struct net_device *dev; struct inet6_dev *idev = NULL; struct inet6_ifaddr *ifa; struct ifmcaddr6 *ifmca; struct ifacaddr6 *ifaca; s_idx = cb->args[0]; s_ip_idx = ip_idx = cb->args[1]; read_lock(&dev_base_lock); for (dev = dev_base, idx = 0; dev; dev = dev->next, idx++) { if (idx < s_idx) continue; if (idx > s_idx) s_ip_idx = 0; ip_idx = 0; if ((idev = in6_dev_get(dev)) == NULL) continue; read_lock_bh(&idev->lock); switch (type) { case UNICAST_ADDR: /* unicast address incl. temp addr */ for (ifa = idev->addr_list; ifa; ifa = ifa->if_next, ip_idx++) { if (ip_idx < s_ip_idx) continue; if ((err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, RTM_NEWADDR, NLM_F_MULTI)) <= 0) goto done; } break; case MULTICAST_ADDR: /* multicast address */ for (ifmca = idev->mc_list; ifmca; ifmca = ifmca->next, ip_idx++) { if (ip_idx < s_ip_idx) continue; if ((err = inet6_fill_ifmcaddr(skb, ifmca, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, RTM_GETMULTICAST, NLM_F_MULTI)) <= 0) goto done; } break; case ANYCAST_ADDR: /* anycast address */ for (ifaca = idev->ac_list; ifaca; ifaca = ifaca->aca_next, ip_idx++) { if (ip_idx < s_ip_idx) continue; if ((err = inet6_fill_ifacaddr(skb, ifaca, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, RTM_GETANYCAST, NLM_F_MULTI)) <= 0) goto done; } break; default: break; } read_unlock_bh(&idev->lock); in6_dev_put(idev); } done: if (err <= 0) { read_unlock_bh(&idev->lock); in6_dev_put(idev); } read_unlock(&dev_base_lock); cb->args[0] = idx; cb->args[1] = ip_idx; return skb->len; } static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) { enum addr_type_t type = UNICAST_ADDR; return inet6_dump_addr(skb, cb, type); } static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) { enum addr_type_t type = MULTICAST_ADDR; return inet6_dump_addr(skb, cb, type); } static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) { enum addr_type_t type = ANYCAST_ADDR; return inet6_dump_addr(skb, cb, type); } static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg) { struct rtattr **rta = arg; struct ifaddrmsg *ifm = NLMSG_DATA(nlh); struct in6_addr *addr = NULL; struct net_device *dev = NULL; struct inet6_ifaddr *ifa; struct sk_buff *skb; int size = NLMSG_SPACE(sizeof(struct ifaddrmsg) + INET6_IFADDR_RTA_SPACE); int err; if (rta[IFA_ADDRESS-1]) { if (RTA_PAYLOAD(rta[IFA_ADDRESS-1]) < sizeof(*addr)) return -EINVAL; addr = RTA_DATA(rta[IFA_ADDRESS-1]); } if (rta[IFA_LOCAL-1]) { if (RTA_PAYLOAD(rta[IFA_LOCAL-1]) < sizeof(*addr) || (addr && memcmp(addr, RTA_DATA(rta[IFA_LOCAL-1]), sizeof(*addr)))) return -EINVAL; addr = RTA_DATA(rta[IFA_LOCAL-1]); } if (addr == NULL) return -EINVAL; if (ifm->ifa_index) dev = __dev_get_by_index(ifm->ifa_index); if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) return -EADDRNOTAVAIL; if ((skb = alloc_skb(size, GFP_KERNEL)) == NULL) { err = -ENOBUFS; goto out; } NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid; err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, RTM_NEWADDR, 0); if (err < 0) { err = -EMSGSIZE; goto out_free; } err = netlink_unicast(rtnl, skb, NETLINK_CB(in_skb).pid, MSG_DONTWAIT); if (err > 0) err = 0; out: in6_ifa_put(ifa); return err; out_free: kfree_skb(skb); goto out; } static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) { struct sk_buff *skb; int size = NLMSG_SPACE(sizeof(struct ifaddrmsg) + INET6_IFADDR_RTA_SPACE); skb = alloc_skb(size, GFP_ATOMIC); if (!skb) { netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, ENOBUFS); return; } if (inet6_fill_ifaddr(skb, ifa, current->pid, 0, event, 0) < 0) { kfree_skb(skb); netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFADDR, EINVAL); return; } NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFADDR; netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFADDR, GFP_ATOMIC); } static void inline ipv6_store_devconf(struct ipv6_devconf *cnf, __s32 *array, int bytes) { memset(array, 0, bytes); array[DEVCONF_FORWARDING] = cnf->forwarding; array[DEVCONF_HOPLIMIT] = cnf->hop_limit; array[DEVCONF_MTU6] = cnf->mtu6; array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; array[DEVCONF_AUTOCONF] = cnf->autoconf; array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval; array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay; array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; #ifdef CONFIG_IPV6_PRIVACY array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; #endif array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; #ifdef CONFIG_IPV6_ROUTER_PREF array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval; #ifdef CONFIV_IPV6_ROUTE_INFO array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; #endif #endif } /* Maximum length of ifinfomsg attributes */ #define INET6_IFINFO_RTA_SPACE \ RTA_SPACE(IFNAMSIZ) /* IFNAME */ + \ RTA_SPACE(MAX_ADDR_LEN) /* ADDRESS */ + \ RTA_SPACE(sizeof(u32)) /* MTU */ + \ RTA_SPACE(sizeof(int)) /* LINK */ + \ RTA_SPACE(0) /* PROTINFO */ + \ RTA_SPACE(sizeof(u32)) /* FLAGS */ + \ RTA_SPACE(sizeof(struct ifla_cacheinfo)) /* CACHEINFO */ + \ RTA_SPACE(sizeof(__s32[DEVCONF_MAX])) /* CONF */ static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, u32 pid, u32 seq, int event, unsigned int flags) { struct net_device *dev = idev->dev; __s32 *array = NULL; struct ifinfomsg *r; struct nlmsghdr *nlh; unsigned char *b = skb->tail; struct rtattr *subattr; __u32 mtu = dev->mtu; struct ifla_cacheinfo ci; nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags); r = NLMSG_DATA(nlh); r->ifi_family = AF_INET6; r->__ifi_pad = 0; r->ifi_type = dev->type; r->ifi_index = dev->ifindex; r->ifi_flags = dev_get_flags(dev); r->ifi_change = 0; RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name); if (dev->addr_len) RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu); if (dev->ifindex != dev->iflink) RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink); subattr = (struct rtattr*)skb->tail; RTA_PUT(skb, IFLA_PROTINFO, 0, NULL); /* return the device flags */ RTA_PUT(skb, IFLA_INET6_FLAGS, sizeof(__u32), &idev->if_flags); /* return interface cacheinfo */ ci.max_reasm_len = IPV6_MAXPLEN; ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ); ci.reachable_time = idev->nd_parms->reachable_time; ci.retrans_time = idev->nd_parms->retrans_time; RTA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci); /* return the device sysctl params */ if ((array = kmalloc(DEVCONF_MAX * sizeof(*array), GFP_ATOMIC)) == NULL) goto rtattr_failure; ipv6_store_devconf(&idev->cnf, array, DEVCONF_MAX * sizeof(*array)); RTA_PUT(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(*array), array); /* XXX - Statistics/MC not implemented */ subattr->rta_len = skb->tail - (u8*)subattr; nlh->nlmsg_len = skb->tail - b; kfree(array); return skb->len; nlmsg_failure: rtattr_failure: kfree(array); skb_trim(skb, b - skb->data); return -1; } static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) { int idx, err; int s_idx = cb->args[0]; struct net_device *dev; struct inet6_dev *idev; read_lock(&dev_base_lock); for (dev=dev_base, idx=0; dev; dev = dev->next, idx++) { if (idx < s_idx) continue; if ((idev = in6_dev_get(dev)) == NULL) continue; err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI); in6_dev_put(idev); if (err <= 0) break; } read_unlock(&dev_base_lock); cb->args[0] = idx; return skb->len; } void inet6_ifinfo_notify(int event, struct inet6_dev *idev) { struct sk_buff *skb; int size = NLMSG_SPACE(sizeof(struct ifinfomsg) + INET6_IFINFO_RTA_SPACE); skb = alloc_skb(size, GFP_ATOMIC); if (!skb) { netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, ENOBUFS); return; } if (inet6_fill_ifinfo(skb, idev, current->pid, 0, event, 0) < 0) { kfree_skb(skb); netlink_set_err(rtnl, 0, RTNLGRP_IPV6_IFINFO, EINVAL); return; } NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_IFINFO; netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_IFINFO, GFP_ATOMIC); } /* Maximum length of prefix_cacheinfo attributes */ #define INET6_PREFIX_RTA_SPACE \ RTA_SPACE(sizeof(((struct prefix_info *)NULL)->prefix)) /* ADDRESS */ + \ RTA_SPACE(sizeof(struct prefix_cacheinfo)) /* CACHEINFO */ static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, struct prefix_info *pinfo, u32 pid, u32 seq, int event, unsigned int flags) { struct prefixmsg *pmsg; struct nlmsghdr *nlh; unsigned char *b = skb->tail; struct prefix_cacheinfo ci; nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*pmsg), flags); pmsg = NLMSG_DATA(nlh); pmsg->prefix_family = AF_INET6; pmsg->prefix_pad1 = 0; pmsg->prefix_pad2 = 0; pmsg->prefix_ifindex = idev->dev->ifindex; pmsg->prefix_len = pinfo->prefix_len; pmsg->prefix_type = pinfo->type; pmsg->prefix_pad3 = 0; pmsg->prefix_flags = 0; if (pinfo->onlink) pmsg->prefix_flags |= IF_PREFIX_ONLINK; if (pinfo->autoconf) pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; RTA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix); ci.preferred_time = ntohl(pinfo->prefered); ci.valid_time = ntohl(pinfo->valid); RTA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci); nlh->nlmsg_len = skb->tail - b; return skb->len; nlmsg_failure: rtattr_failure: skb_trim(skb, b - skb->data); return -1; } static void inet6_prefix_notify(int event, struct inet6_dev *idev, struct prefix_info *pinfo) { struct sk_buff *skb; int size = NLMSG_SPACE(sizeof(struct prefixmsg) + INET6_PREFIX_RTA_SPACE); skb = alloc_skb(size, GFP_ATOMIC); if (!skb) { netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, ENOBUFS); return; } if (inet6_fill_prefix(skb, idev, pinfo, current->pid, 0, event, 0) < 0) { kfree_skb(skb); netlink_set_err(rtnl, 0, RTNLGRP_IPV6_PREFIX, EINVAL); return; } NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_PREFIX; netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_PREFIX, GFP_ATOMIC); } static struct rtnetlink_link inet6_rtnetlink_table[RTM_NR_MSGTYPES] = { [RTM_GETLINK - RTM_BASE] = { .dumpit = inet6_dump_ifinfo, }, [RTM_NEWADDR - RTM_BASE] = { .doit = inet6_rtm_newaddr, }, [RTM_DELADDR - RTM_BASE] = { .doit = inet6_rtm_deladdr, }, [RTM_GETADDR - RTM_BASE] = { .doit = inet6_rtm_getaddr, .dumpit = inet6_dump_ifaddr, }, [RTM_GETMULTICAST - RTM_BASE] = { .dumpit = inet6_dump_ifmcaddr, }, [RTM_GETANYCAST - RTM_BASE] = { .dumpit = inet6_dump_ifacaddr, }, [RTM_NEWROUTE - RTM_BASE] = { .doit = inet6_rtm_newroute, }, [RTM_DELROUTE - RTM_BASE] = { .doit = inet6_rtm_delroute, }, [RTM_GETROUTE - RTM_BASE] = { .doit = inet6_rtm_getroute, .dumpit = inet6_dump_fib, }, }; static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) { inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); switch (event) { case RTM_NEWADDR: ip6_ins_rt(ifp->rt, NULL, NULL, NULL); if (ifp->idev->cnf.forwarding) addrconf_join_anycast(ifp); break; case RTM_DELADDR: if (ifp->idev->cnf.forwarding) addrconf_leave_anycast(ifp); addrconf_leave_solict(ifp->idev, &ifp->addr); dst_hold(&ifp->rt->u.dst); if (ip6_del_rt(ifp->rt, NULL, NULL, NULL)) dst_free(&ifp->rt->u.dst); break; } } static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) { read_lock_bh(&addrconf_lock); if (likely(ifp->idev->dead == 0)) __ipv6_ifa_notify(event, ifp); read_unlock_bh(&addrconf_lock); } #ifdef CONFIG_SYSCTL static int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp, void __user *buffer, size_t *lenp, loff_t *ppos) { int *valp = ctl->data; int val = *valp; int ret; ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); if (write && valp != &ipv6_devconf_dflt.forwarding) { if (valp != &ipv6_devconf.forwarding) { if ((!*valp) ^ (!val)) { struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; if (idev == NULL) return ret; dev_forward_change(idev); } } else { ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding; addrconf_forward_change(); } if (*valp) rt6_purge_dflt_routers(); } return ret; } static int addrconf_sysctl_forward_strategy(ctl_table *table, int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp, void __user *newval, size_t newlen, void **context) { int *valp = table->data; int new; if (!newval || !newlen) return 0; if (newlen != sizeof(int)) return -EINVAL; if (get_user(new, (int __user *)newval)) return -EFAULT; if (new == *valp) return 0; if (oldval && oldlenp) { size_t len; if (get_user(len, oldlenp)) return -EFAULT; if (len) { if (len > table->maxlen) len = table->maxlen; if (copy_to_user(oldval, valp, len)) return -EFAULT; if (put_user(len, oldlenp)) return -EFAULT; } } if (valp != &ipv6_devconf_dflt.forwarding) { if (valp != &ipv6_devconf.forwarding) { struct inet6_dev *idev = (struct inet6_dev *)table->extra1; int changed; if (unlikely(idev == NULL)) return -ENODEV; changed = (!*valp) ^ (!new); *valp = new; if (changed) dev_forward_change(idev); } else { *valp = new; addrconf_forward_change(); } if (*valp) rt6_purge_dflt_routers(); } else *valp = new; return 1; } static struct addrconf_sysctl_table { struct ctl_table_header *sysctl_header; ctl_table addrconf_vars[__NET_IPV6_MAX]; ctl_table addrconf_dev[2]; ctl_table addrconf_conf_dir[2]; ctl_table addrconf_proto_dir[2]; ctl_table addrconf_root_dir[2]; } addrconf_sysctl = { .sysctl_header = NULL, .addrconf_vars = { { .ctl_name = NET_IPV6_FORWARDING, .procname = "forwarding", .data = &ipv6_devconf.forwarding, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &addrconf_sysctl_forward, .strategy = &addrconf_sysctl_forward_strategy, }, { .ctl_name = NET_IPV6_HOP_LIMIT, .procname = "hop_limit", .data = &ipv6_devconf.hop_limit, .maxlen = sizeof(int), .mode = 0644, .proc_handler = proc_dointvec, }, { .ctl_name = NET_IPV6_MTU, .procname = "mtu", .data = &ipv6_devconf.mtu6, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec, }, { .ctl_name = NET_IPV6_ACCEPT_RA, .procname = "accept_ra", .data = &ipv6_devconf.accept_ra, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec, }, { .ctl_name = NET_IPV6_ACCEPT_REDIRECTS, .procname = "accept_redirects", .data = &ipv6_devconf.accept_redirects, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec, }, { .ctl_name = NET_IPV6_AUTOCONF, .procname = "autoconf", .data = &ipv6_devconf.autoconf, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec, }, { .ctl_name = NET_IPV6_DAD_TRANSMITS, .procname = "dad_transmits", .data = &ipv6_devconf.dad_transmits, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec, }, { .ctl_name = NET_IPV6_RTR_SOLICITS, .procname = "router_solicitations", .data = &ipv6_devconf.rtr_solicits, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec, }, { .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL, .procname = "router_solicitation_interval", .data = &ipv6_devconf.rtr_solicit_interval, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec_jiffies, .strategy = &sysctl_jiffies, }, { .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY, .procname = "router_solicitation_delay", .data = &ipv6_devconf.rtr_solicit_delay, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec_jiffies, .strategy = &sysctl_jiffies, }, { .ctl_name = NET_IPV6_FORCE_MLD_VERSION, .procname = "force_mld_version", .data = &ipv6_devconf.force_mld_version, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec, }, #ifdef CONFIG_IPV6_PRIVACY { .ctl_name = NET_IPV6_USE_TEMPADDR, .procname = "use_tempaddr", .data = &ipv6_devconf.use_tempaddr, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec, }, { .ctl_name = NET_IPV6_TEMP_VALID_LFT, .procname = "temp_valid_lft", .data = &ipv6_devconf.temp_valid_lft, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec, }, { .ctl_name = NET_IPV6_TEMP_PREFERED_LFT, .procname = "temp_prefered_lft", .data = &ipv6_devconf.temp_prefered_lft, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec, }, { .ctl_name = NET_IPV6_REGEN_MAX_RETRY, .procname = "regen_max_retry", .data = &ipv6_devconf.regen_max_retry, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec, }, { .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR, .procname = "max_desync_factor", .data = &ipv6_devconf.max_desync_factor, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec, }, #endif { .ctl_name = NET_IPV6_MAX_ADDRESSES, .procname = "max_addresses", .data = &ipv6_devconf.max_addresses, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec, }, { .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR, .procname = "accept_ra_defrtr", .data = &ipv6_devconf.accept_ra_defrtr, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec, }, { .ctl_name = NET_IPV6_ACCEPT_RA_PINFO, .procname = "accept_ra_pinfo", .data = &ipv6_devconf.accept_ra_pinfo, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec, }, #ifdef CONFIG_IPV6_ROUTER_PREF { .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF, .procname = "accept_ra_rtr_pref", .data = &ipv6_devconf.accept_ra_rtr_pref, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec, }, { .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL, .procname = "router_probe_interval", .data = &ipv6_devconf.rtr_probe_interval, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec_jiffies, .strategy = &sysctl_jiffies, }, #ifdef CONFIV_IPV6_ROUTE_INFO { .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN, .procname = "accept_ra_rt_info_max_plen", .data = &ipv6_devconf.accept_ra_rt_info_max_plen, .maxlen = sizeof(int), .mode = 0644, .proc_handler = &proc_dointvec, }, #endif #endif { .ctl_name = 0, /* sentinel */ } }, .addrconf_dev = { { .ctl_name = NET_PROTO_CONF_ALL, .procname = "all", .mode = 0555, .child = addrconf_sysctl.addrconf_vars, }, { .ctl_name = 0, /* sentinel */ } }, .addrconf_conf_dir = { { .ctl_name = NET_IPV6_CONF, .procname = "conf", .mode = 0555, .child = addrconf_sysctl.addrconf_dev, }, { .ctl_name = 0, /* sentinel */ } }, .addrconf_proto_dir = { { .ctl_name = NET_IPV6, .procname = "ipv6", .mode = 0555, .child = addrconf_sysctl.addrconf_conf_dir, }, { .ctl_name = 0, /* sentinel */ } }, .addrconf_root_dir = { { .ctl_name = CTL_NET, .procname = "net", .mode = 0555, .child = addrconf_sysctl.addrconf_proto_dir, }, { .ctl_name = 0, /* sentinel */ } }, }; static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p) { int i; struct net_device *dev = idev ? idev->dev : NULL; struct addrconf_sysctl_table *t; char *dev_name = NULL; t = kmalloc(sizeof(*t), GFP_KERNEL); if (t == NULL) return; memcpy(t, &addrconf_sysctl, sizeof(*t)); for (i=0; t->addrconf_vars[i].data; i++) { t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf; t->addrconf_vars[i].de = NULL; t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ } if (dev) { dev_name = dev->name; t->addrconf_dev[0].ctl_name = dev->ifindex; } else { dev_name = "default"; t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT; } /* * Make a copy of dev_name, because '.procname' is regarded as const * by sysctl and we wouldn't want anyone to change it under our feet * (see SIOCSIFNAME). */ dev_name = kstrdup(dev_name, GFP_KERNEL); if (!dev_name) goto free; t->addrconf_dev[0].procname = dev_name; t->addrconf_dev[0].child = t->addrconf_vars; t->addrconf_dev[0].de = NULL; t->addrconf_conf_dir[0].child = t->addrconf_dev; t->addrconf_conf_dir[0].de = NULL; t->addrconf_proto_dir[0].child = t->addrconf_conf_dir; t->addrconf_proto_dir[0].de = NULL; t->addrconf_root_dir[0].child = t->addrconf_proto_dir; t->addrconf_root_dir[0].de = NULL; t->sysctl_header = register_sysctl_table(t->addrconf_root_dir, 0); if (t->sysctl_header == NULL) goto free_procname; else p->sysctl = t; return; /* error path */ free_procname: kfree(dev_name); free: kfree(t); return; } static void addrconf_sysctl_unregister(struct ipv6_devconf *p) { if (p->sysctl) { struct addrconf_sysctl_table *t = p->sysctl; p->sysctl = NULL; unregister_sysctl_table(t->sysctl_header); kfree(t->addrconf_dev[0].procname); kfree(t); } } #endif /* * Device notifier */ int register_inet6addr_notifier(struct notifier_block *nb) { return atomic_notifier_chain_register(&inet6addr_chain, nb); } int unregister_inet6addr_notifier(struct notifier_block *nb) { return atomic_notifier_chain_unregister(&inet6addr_chain,nb); } /* * Init / cleanup code */ int __init addrconf_init(void) { int err = 0; /* The addrconf netdev notifier requires that loopback_dev * has it's ipv6 private information allocated and setup * before it can bring up and give link-local addresses * to other devices which are up. * * Unfortunately, loopback_dev is not necessarily the first * entry in the global dev_base list of net devices. In fact, * it is likely to be the very last entry on that list. * So this causes the notifier registry below to try and * give link-local addresses to all devices besides loopback_dev * first, then loopback_dev, which cases all the non-loopback_dev * devices to fail to get a link-local address. * * So, as a temporary fix, allocate the ipv6 structure for * loopback_dev first by hand. * Longer term, all of the dependencies ipv6 has upon the loopback * device and it being up should be removed. */ rtnl_lock(); if (!ipv6_add_dev(&loopback_dev)) err = -ENOMEM; rtnl_unlock(); if (err) return err; ip6_null_entry.rt6i_idev = in6_dev_get(&loopback_dev); register_netdevice_notifier(&ipv6_dev_notf); addrconf_verify(0); rtnetlink_links[PF_INET6] = inet6_rtnetlink_table; #ifdef CONFIG_SYSCTL addrconf_sysctl.sysctl_header = register_sysctl_table(addrconf_sysctl.addrconf_root_dir, 0); addrconf_sysctl_register(NULL, &ipv6_devconf_dflt); #endif return 0; } void __exit addrconf_cleanup(void) { struct net_device *dev; struct inet6_dev *idev; struct inet6_ifaddr *ifa; int i; unregister_netdevice_notifier(&ipv6_dev_notf); rtnetlink_links[PF_INET6] = NULL; #ifdef CONFIG_SYSCTL addrconf_sysctl_unregister(&ipv6_devconf_dflt); addrconf_sysctl_unregister(&ipv6_devconf); #endif rtnl_lock(); /* * clean dev list. */ for (dev=dev_base; dev; dev=dev->next) { if ((idev = __in6_dev_get(dev)) == NULL) continue; addrconf_ifdown(dev, 1); } addrconf_ifdown(&loopback_dev, 2); /* * Check hash table. */ write_lock_bh(&addrconf_hash_lock); for (i=0; i < IN6_ADDR_HSIZE; i++) { for (ifa=inet6_addr_lst[i]; ifa; ) { struct inet6_ifaddr *bifa; bifa = ifa; ifa = ifa->lst_next; printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa); /* Do not free it; something is wrong. Now we can investigate it with debugger. */ } } write_unlock_bh(&addrconf_hash_lock); del_timer(&addr_chk_timer); rtnl_unlock(); #ifdef CONFIG_PROC_FS proc_net_remove("if_inet6"); #endif }