addrconf.c
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上传日期:2013-02-24
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文件大小:46k
- /*
- * 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 doube 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.
- */
- #include <linux/config.h>
- #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/route.h>
- #include <linux/inetdevice.h>
- #include <linux/init.h>
- #ifdef CONFIG_SYSCTL
- #include <linux/sysctl.h>
- #endif
- #include <linux/delay.h>
- #include <linux/notifier.h>
- #include <linux/proc_fs.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/ip.h>
- #include <linux/if_tunnel.h>
- #include <linux/rtnetlink.h>
- #include <asm/uaccess.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
- #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
- int inet6_dev_count;
- int inet6_ifa_count;
- /*
- * Configured unicast address hash table
- */
- static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
- static rwlock_t addrconf_hash_lock = RW_LOCK_UNLOCKED;
- /* Protects inet6 devices */
- rwlock_t addrconf_lock = RW_LOCK_UNLOCKED;
- void addrconf_verify(unsigned long);
- static struct timer_list addr_chk_timer = { function: addrconf_verify };
- static int addrconf_ifdown(struct net_device *dev, int how);
- static void addrconf_dad_start(struct inet6_ifaddr *ifp);
- static void addrconf_dad_timer(unsigned long data);
- static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
- static void addrconf_rs_timer(unsigned long data);
- static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
- static struct notifier_block *inet6addr_chain;
- struct ipv6_devconf ipv6_devconf =
- {
- 0, /* forwarding */
- IPV6_DEFAULT_HOPLIMIT, /* hop limit */
- IPV6_MIN_MTU, /* mtu */
- 1, /* accept RAs */
- 1, /* accept redirects */
- 1, /* autoconfiguration */
- 1, /* dad transmits */
- MAX_RTR_SOLICITATIONS, /* router solicits */
- RTR_SOLICITATION_INTERVAL, /* rtr solicit interval */
- MAX_RTR_SOLICITATION_DELAY, /* rtr solicit delay */
- };
- static struct ipv6_devconf ipv6_devconf_dflt =
- {
- 0, /* forwarding */
- IPV6_DEFAULT_HOPLIMIT, /* hop limit */
- IPV6_MIN_MTU, /* mtu */
- 1, /* accept RAs */
- 1, /* accept redirects */
- 1, /* autoconfiguration */
- 1, /* dad transmits */
- MAX_RTR_SOLICITATIONS, /* router solicits */
- RTR_SOLICITATION_INTERVAL, /* rtr solicit interval */
- MAX_RTR_SOLICITATION_DELAY, /* rtr solicit delay */
- };
- int ipv6_addr_type(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 & __constant_htonl(0xE0000000)) != __constant_htonl(0x00000000) &&
- (st & __constant_htonl(0xE0000000)) != __constant_htonl(0xE0000000))
- return IPV6_ADDR_UNICAST;
- if ((st & __constant_htonl(0xFF000000)) == __constant_htonl(0xFF000000)) {
- int type = IPV6_ADDR_MULTICAST;
- switch((st & __constant_htonl(0x00FF0000))) {
- case __constant_htonl(0x00010000):
- type |= IPV6_ADDR_LOOPBACK;
- break;
- case __constant_htonl(0x00020000):
- type |= IPV6_ADDR_LINKLOCAL;
- break;
- case __constant_htonl(0x00050000):
- type |= IPV6_ADDR_SITELOCAL;
- break;
- };
- return type;
- }
-
- if ((st & __constant_htonl(0xFFC00000)) == __constant_htonl(0xFE800000))
- return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST);
- if ((st & __constant_htonl(0xFFC00000)) == __constant_htonl(0xFEC00000))
- return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST);
- if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
- if (addr->s6_addr32[2] == 0) {
- if (addr->in6_u.u6_addr32[3] == 0)
- return IPV6_ADDR_ANY;
- if (addr->s6_addr32[3] == __constant_htonl(0x00000001))
- return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST);
- return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST);
- }
- if (addr->s6_addr32[2] == __constant_htonl(0x0000ffff))
- return IPV6_ADDR_MAPPED;
- }
- return IPV6_ADDR_RESERVED;
- }
- 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: %sn", dev ? dev->name : "NIL");
- #endif
- dev_put(dev);
- if (!idev->dead) {
- printk("Freeing alive inet6 device %pn", idev);
- return;
- }
- inet6_dev_count--;
- 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 = kmalloc(sizeof(struct inet6_dev), GFP_KERNEL);
- if (ndev) {
- memset(ndev, 0, sizeof(struct inet6_dev));
- ndev->lock = RW_LOCK_UNLOCKED;
- 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;
- }
- inet6_dev_count++;
- /* We refer to the device */
- dev_hold(dev);
- write_lock_bh(&addrconf_lock);
- dev->ip6_ptr = ndev;
- /* One reference from device */
- in6_dev_hold(ndev);
- write_unlock_bh(&addrconf_lock);
- ipv6_mc_init_dev(ndev);
- #ifdef CONFIG_SYSCTL
- neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6, NET_IPV6_NEIGH, "ipv6");
- 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;
- }
- static void addrconf_forward_change(struct inet6_dev *idev)
- {
- struct net_device *dev;
- if (idev)
- return;
- read_lock(&dev_base_lock);
- for (dev=dev_base; dev; dev=dev->next) {
- read_lock(&addrconf_lock);
- idev = __in6_dev_get(dev);
- if (idev)
- idev->cnf.forwarding = ipv6_devconf.forwarding;
- read_unlock(&addrconf_lock);
- }
- read_unlock(&dev_base_lock);
- }
- /* 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_destroyn");
- #endif
- in6_dev_put(ifp->idev);
- if (del_timer(&ifp->timer))
- printk("Timer is still running, when freeing ifa=%pn", ifp);
- if (!ifp->dead) {
- printk("Freeing alive inet6 address %pn", ifp);
- return;
- }
- inet6_ifa_count--;
- kfree(ifp);
- }
- /* On success it returns ifp with increased reference count */
- static struct inet6_ifaddr *
- ipv6_add_addr(struct inet6_dev *idev, struct in6_addr *addr, int pfxlen,
- int scope, unsigned flags)
- {
- struct inet6_ifaddr *ifa;
- int hash;
- ifa = kmalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
- if (ifa == NULL) {
- ADBG(("ipv6_add_addr: malloc failedn"));
- return NULL;
- }
- memset(ifa, 0, sizeof(struct inet6_ifaddr));
- 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;
- read_lock(&addrconf_lock);
- if (idev->dead) {
- read_unlock(&addrconf_lock);
- kfree(ifa);
- return NULL;
- }
- inet6_ifa_count++;
- ifa->idev = idev;
- in6_dev_hold(idev);
- /* For caller */
- in6_ifa_hold(ifa);
- /* Add to big hash table */
- hash = ipv6_addr_hash(addr);
- write_lock_bh(&addrconf_hash_lock);
- ifa->lst_next = inet6_addr_lst[hash];
- inet6_addr_lst[hash] = ifa;
- in6_ifa_hold(ifa);
- write_unlock_bh(&addrconf_hash_lock);
- write_lock_bh(&idev->lock);
- /* Add to inet6_dev unicast addr list. */
- ifa->if_next = idev->addr_list;
- idev->addr_list = ifa;
- in6_ifa_hold(ifa);
- write_unlock_bh(&idev->lock);
- read_unlock(&addrconf_lock);
- notifier_call_chain(&inet6addr_chain,NETDEV_UP,ifa);
- return ifa;
- }
- /* 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;
- 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);
- for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;
- ifap = &ifa->if_next) {
- if (ifa == ifp) {
- *ifap = ifa->if_next;
- __in6_ifa_put(ifp);
- ifa->if_next = NULL;
- break;
- }
- }
- write_unlock_bh(&idev->lock);
- ipv6_ifa_notify(RTM_DELADDR, ifp);
- notifier_call_chain(&inet6addr_chain,NETDEV_DOWN,ifp);
- addrconf_del_timer(ifp);
- in6_ifa_put(ifp);
- }
- /*
- * Choose an apropriate source address
- * should do:
- * i) get an address with an apropriate scope
- * ii) see if there is a specific route for the destination and use
- * an address of the attached interface
- * iii) don't use deprecated addresses
- */
- int ipv6_get_saddr(struct dst_entry *dst,
- struct in6_addr *daddr, struct in6_addr *saddr)
- {
- int scope;
- struct inet6_ifaddr *ifp = NULL;
- struct inet6_ifaddr *match = NULL;
- struct net_device *dev = NULL;
- struct inet6_dev *idev;
- struct rt6_info *rt;
- int err;
- rt = (struct rt6_info *) dst;
- if (rt)
- dev = rt->rt6i_dev;
- scope = ipv6_addr_scope(daddr);
- if (rt && (rt->rt6i_flags & RTF_ALLONLINK)) {
- /*
- * route for the "all destinations on link" rule
- * when no routers are present
- */
- scope = IFA_LINK;
- }
- /*
- * known dev
- * search dev and walk through dev addresses
- */
- if (dev) {
- if (dev->flags & IFF_LOOPBACK)
- scope = IFA_HOST;
- read_lock(&addrconf_lock);
- idev = __in6_dev_get(dev);
- if (idev) {
- read_lock_bh(&idev->lock);
- for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
- if (ifp->scope == scope) {
- if (!(ifp->flags & (IFA_F_DEPRECATED|IFA_F_TENTATIVE))) {
- in6_ifa_hold(ifp);
- read_unlock_bh(&idev->lock);
- read_unlock(&addrconf_lock);
- goto out;
- }
- if (!match && !(ifp->flags & IFA_F_TENTATIVE)) {
- match = ifp;
- in6_ifa_hold(ifp);
- }
- }
- }
- read_unlock_bh(&idev->lock);
- }
- read_unlock(&addrconf_lock);
- }
- if (scope == IFA_LINK)
- goto out;
- /*
- * dev == NULL or search failed for specified dev
- */
- read_lock(&dev_base_lock);
- read_lock(&addrconf_lock);
- for (dev = dev_base; dev; dev=dev->next) {
- idev = __in6_dev_get(dev);
- if (idev) {
- read_lock_bh(&idev->lock);
- for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
- if (ifp->scope == scope) {
- if (!(ifp->flags&(IFA_F_DEPRECATED|IFA_F_TENTATIVE))) {
- in6_ifa_hold(ifp);
- read_unlock_bh(&idev->lock);
- goto out_unlock_base;
- }
- if (!match && !(ifp->flags&IFA_F_TENTATIVE)) {
- match = ifp;
- in6_ifa_hold(ifp);
- }
- }
- }
- read_unlock_bh(&idev->lock);
- }
- }
- out_unlock_base:
- read_unlock(&addrconf_lock);
- read_unlock(&dev_base_lock);
- out:
- if (ifp == NULL) {
- ifp = match;
- match = NULL;
- }
- err = -EADDRNOTAVAIL;
- if (ifp) {
- ipv6_addr_copy(saddr, &ifp->addr);
- err = 0;
- in6_ifa_put(ifp);
- }
- if (match)
- in6_ifa_put(match);
- return err;
- }
- 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;
- }
- int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev)
- {
- 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_cmp(&ifp->addr, addr) == 0 &&
- !(ifp->flags&IFA_F_TENTATIVE)) {
- if (dev == NULL || ifp->idev->dev == dev ||
- !(ifp->scope&(IFA_LINK|IFA_HOST)))
- break;
- }
- }
- read_unlock_bh(&addrconf_hash_lock);
- return ifp != NULL;
- }
- struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev)
- {
- 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_cmp(&ifp->addr, addr) == 0) {
- if (dev == NULL || ifp->idev->dev == dev ||
- !(ifp->scope&(IFA_LINK|IFA_HOST))) {
- in6_ifa_hold(ifp);
- break;
- }
- }
- }
- read_unlock_bh(&addrconf_hash_lock);
- return ifp;
- }
- /* Gets referenced address, destroys ifaddr */
- void addrconf_dad_failure(struct inet6_ifaddr *ifp)
- {
- if (net_ratelimit())
- printk(KERN_INFO "%s: duplicate address detected!n", ifp->idev->dev->name);
- 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);
- } else
- ipv6_del_addr(ifp);
- }
- /* Join to solicited addr multicast group. */
- static 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);
- }
- static void addrconf_leave_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_dec(dev, &maddr);
- }
- static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
- {
- switch (dev->type) {
- case ARPHRD_ETHER:
- case ARPHRD_FDDI:
- case ARPHRD_IEEE802_TR:
- if (dev->addr_len != ETH_ALEN)
- return -1;
- memcpy(eui, dev->dev_addr, 3);
- memcpy(eui + 5, dev->dev_addr+3, 3);
- eui[3] = 0xFF;
- eui[4] = 0xFE;
- eui[0] ^= 2;
- return 0;
- }
- 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;
- }
- /*
- * Add prefix route.
- */
- static void
- addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
- unsigned long expires, unsigned flags)
- {
- struct in6_rtmsg rtmsg;
- memset(&rtmsg, 0, sizeof(rtmsg));
- memcpy(&rtmsg.rtmsg_dst, pfx, sizeof(struct in6_addr));
- 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);
- }
- /* 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,
- __constant_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|RTF_ADDRCONF;
- rtmsg.rtmsg_type = RTMSG_NEWROUTE;
- ip6_route_add(&rtmsg);
- }
- 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 bytes "::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);
- }
- static void addrconf_add_lroute(struct net_device *dev)
- {
- struct in6_addr addr;
- ipv6_addr_set(&addr, __constant_htonl(0xFE800000), 0, 0, 0);
- addrconf_prefix_route(&addr, 10, dev, 0, RTF_ADDRCONF);
- }
- 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;
- struct rt6_info *rt;
- __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 shortn"));
- 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 lifetimen");
- return;
- }
- in6_dev = in6_dev_get(dev);
- if (in6_dev == NULL) {
- if (net_ratelimit())
- printk(KERN_DEBUG "addrconf: device %s not configuredn", dev->name);
- return;
- }
- /*
- * Two things going on here:
- * 1) Add routes for on-link prefixes
- * 2) Configure prefixes with the auto flag set
- */
- /* Avoid arithemtic 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 = 0;
- else
- rt_expires = jiffies + valid_lft * HZ;
- 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 (pinfo->onlink == 0 || valid_lft == 0) {
- ip6_del_rt(rt);
- rt = NULL;
- } else {
- rt->rt6i_expires = rt_expires;
- }
- }
- } else if (pinfo->onlink && valid_lft) {
- addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
- dev, rt_expires, RTF_ADDRCONF|RTF_EXPIRES);
- }
- 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 plen;
- plen = pinfo->prefix_len >> 3;
- 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 %dn",
- pinfo->prefix_len);
- in6_dev_put(in6_dev);
- return;
- ok:
- ifp = ipv6_get_ifaddr(&addr, dev);
- if (ifp == NULL && valid_lft) {
- ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
- addr_type&IPV6_ADDR_SCOPE_MASK, 0);
- if (ifp == NULL) {
- in6_dev_put(in6_dev);
- return;
- }
- addrconf_dad_start(ifp);
- }
- if (ifp && valid_lft == 0) {
- ipv6_del_addr(ifp);
- ifp = NULL;
- }
- if (ifp) {
- int flags;
- spin_lock(&ifp->lock);
- ifp->valid_lft = valid_lft;
- ifp->prefered_lft = prefered_lft;
- ifp->tstamp = jiffies;
- flags = ifp->flags;
- ifp->flags &= ~IFA_F_DEPRECATED;
- spin_unlock(&ifp->lock);
- if (!(flags&IFA_F_TENTATIVE))
- ipv6_ifa_notify((flags&IFA_F_DEPRECATED) ?
- 0 : RTM_NEWADDR, ifp);
- in6_ifa_put(ifp);
- }
- }
- 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 *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*)&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)
- {
- struct inet6_ifaddr *ifp;
- struct inet6_dev *idev;
- struct net_device *dev;
- int scope;
- ASSERT_RTNL();
-
- 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 ((ifp = ipv6_add_addr(idev, pfx, plen, scope, IFA_F_PERMANENT)) != NULL) {
- addrconf_dad_start(ifp);
- in6_ifa_put(ifp);
- return 0;
- }
- return -ENOBUFS;
- }
- 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 &&
- (!memcmp(pfx, &ifp->addr, sizeof(struct in6_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 *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);
- rtnl_unlock();
- return err;
- }
- int addrconf_del_ifaddr(void *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] = __constant_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 (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(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 = 10;
- else
- plen = 96;
- ifp = ipv6_add_addr(idev, &addr, plen, flag,
- IFA_F_PERMANENT);
- if (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 in6_addr addr;
- struct inet6_dev *idev;
- struct inet6_ifaddr * ifp;
- /* ::1 */
- ASSERT_RTNL();
- memset(&addr, 0, sizeof(struct in6_addr));
- addr.s6_addr[15] = 1;
- if ((idev = ipv6_find_idev(dev)) == NULL) {
- printk(KERN_DEBUG "init loopback: add_dev failedn");
- return;
- }
- ifp = ipv6_add_addr(idev, &addr, 128, IFA_HOST, IFA_F_PERMANENT);
- if (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, 10, IFA_LINK, IFA_F_PERMANENT);
- if (ifp) {
- addrconf_dad_start(ifp);
- 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)) {
- /* 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_addr[0] = 0xFE;
- addr.s6_addr[1] = 0x80;
- 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 failedn");
- return;
- }
- sit_add_v4_addrs(idev);
- if (dev->flags&IFF_POINTOPOINT) {
- addrconf_add_mroute(dev);
- addrconf_add_lroute(dev);
- } else
- sit_route_add(dev);
- }
- int addrconf_notify(struct notifier_block *this, unsigned long event,
- void * data)
- {
- struct net_device *dev;
- dev = (struct net_device *) data;
- switch(event) {
- case NETDEV_UP:
- switch(dev->type) {
- case ARPHRD_SIT:
- addrconf_sit_config(dev);
- break;
- case ARPHRD_LOOPBACK:
- init_loopback(dev);
- break;
- default:
- addrconf_dev_config(dev);
- break;
- };
- break;
- case NETDEV_CHANGEMTU:
- if (dev->mtu >= IPV6_MIN_MTU) {
- struct inet6_dev *idev;
- if ((idev = __in6_dev_get(dev)) == NULL)
- break;
- idev->cnf.mtu6 = dev->mtu;
- rt6_mtu_change(dev, 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_CHANGE:
- break;
- };
- return NOTIFY_OK;
- }
- static int addrconf_ifdown(struct net_device *dev, int how)
- {
- struct inet6_dev *idev;
- struct inet6_ifaddr *ifa, **bifa;
- int i;
- ASSERT_RTNL();
- 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 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);
- }
- /* Step 3: clear address list */
- write_lock_bh(&idev->lock);
- 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 4: Discard multicast list */
- if (how == 1)
- ipv6_mc_destroy_dev(idev);
- else
- ipv6_mc_down(idev);
- /* Shot the device (if unregistered) */
- if (how == 1) {
- neigh_parms_release(&nd_tbl, idev->nd_parms);
- #ifdef CONFIG_SYSCTL
- addrconf_sysctl_unregister(&idev->cnf);
- #endif
- 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 {
- struct in6_rtmsg rtmsg;
- spin_unlock(&ifp->lock);
- printk(KERN_DEBUG "%s: no IPv6 routers presentn",
- ifp->idev->dev->name);
- memset(&rtmsg, 0, sizeof(struct in6_rtmsg));
- rtmsg.rtmsg_type = RTMSG_NEWROUTE;
- rtmsg.rtmsg_metric = IP6_RT_PRIO_ADDRCONF;
- rtmsg.rtmsg_flags = (RTF_ALLONLINK | RTF_ADDRCONF |
- RTF_DEFAULT | RTF_UP);
- rtmsg.rtmsg_ifindex = ifp->idev->dev->ifindex;
- ip6_route_add(&rtmsg);
- }
- out:
- in6_ifa_put(ifp);
- }
- /*
- * Duplicate Address Detection
- */
- static void addrconf_dad_start(struct inet6_ifaddr *ifp)
- {
- struct net_device *dev;
- unsigned long rand_num;
- dev = ifp->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, RTF_ADDRCONF);
- net_srandom(ifp->addr.s6_addr32[3]);
- rand_num = net_random() % (ifp->idev->cnf.rtr_solicit_delay ? : 1);
- 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);
- addrconf_dad_completed(ifp);
- return;
- }
- ifp->probes = ifp->idev->cnf.dad_transmits;
- addrconf_mod_timer(ifp, AC_DAD, rand_num);
- spin_unlock_bh(&ifp->lock);
- }
- static void addrconf_dad_timer(unsigned long data)
- {
- struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
- struct in6_addr unspec;
- struct in6_addr mcaddr;
- spin_lock_bh(&ifp->lock);
- if (ifp->probes == 0) {
- /*
- * DAD was successful
- */
- ifp->flags &= ~IFA_F_TENTATIVE;
- spin_unlock_bh(&ifp->lock);
- addrconf_dad_completed(ifp);
- in6_ifa_put(ifp);
- return;
- }
- ifp->probes--;
- addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
- spin_unlock_bh(&ifp->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);
- 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 &&
- (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);
- }
- }
- #ifdef CONFIG_PROC_FS
- static int iface_proc_info(char *buffer, char **start, off_t offset,
- int length)
- {
- struct inet6_ifaddr *ifp;
- int i;
- int len = 0;
- off_t pos=0;
- off_t begin=0;
- for (i=0; i < IN6_ADDR_HSIZE; i++) {
- read_lock_bh(&addrconf_hash_lock);
- for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
- int j;
- for (j=0; j<16; j++) {
- sprintf(buffer + len, "%02x",
- ifp->addr.s6_addr[j]);
- len += 2;
- }
- len += sprintf(buffer + len,
- " %02x %02x %02x %02x %8sn",
- ifp->idev->dev->ifindex,
- ifp->prefix_len,
- ifp->scope,
- ifp->flags,
- ifp->idev->dev->name);
- pos=begin+len;
- if(pos<offset) {
- len=0;
- begin=pos;
- }
- if(pos>offset+length) {
- read_unlock_bh(&addrconf_hash_lock);
- goto done;
- }
- }
- read_unlock_bh(&addrconf_hash_lock);
- }
- done:
- *start=buffer+(offset-begin);
- len-=(offset-begin);
- if(len>length)
- len=length;
- if(len<0)
- len=0;
- return len;
- }
- #endif /* CONFIG_PROC_FS */
- /*
- * Periodic address status verification
- */
- void addrconf_verify(unsigned long foo)
- {
- struct inet6_ifaddr *ifp;
- unsigned long now = jiffies;
- int i;
- for (i=0; i < IN6_ADDR_HSIZE; i++) {
- restart:
- write_lock(&addrconf_hash_lock);
- for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
- unsigned long age;
- if (ifp->flags & IFA_F_PERMANENT)
- continue;
- age = (now - ifp->tstamp) / HZ;
- if (age > ifp->valid_lft) {
- in6_ifa_hold(ifp);
- write_unlock(&addrconf_hash_lock);
- ipv6_del_addr(ifp);
- goto restart;
- } else if (age > ifp->prefered_lft) {
- int deprecate = 0;
- spin_lock(&ifp->lock);
- if (!(ifp->flags&IFA_F_DEPRECATED)) {
- deprecate = 1;
- ifp->flags |= IFA_F_DEPRECATED;
- }
- spin_unlock(&ifp->lock);
- if (deprecate) {
- in6_ifa_hold(ifp);
- write_unlock(&addrconf_hash_lock);
- ipv6_ifa_notify(0, ifp);
- in6_ifa_put(ifp);
- goto restart;
- }
- }
- }
- write_unlock(&addrconf_hash_lock);
- }
- mod_timer(&addr_chk_timer, jiffies + ADDR_CHECK_FREQUENCY);
- }
- 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 (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_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;
- 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 (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_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
- }
- static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
- u32 pid, u32 seq, int event)
- {
- struct ifaddrmsg *ifm;
- struct nlmsghdr *nlh;
- struct ifa_cacheinfo ci;
- unsigned char *b = skb->tail;
- nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(*ifm));
- 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 != 0xFFFFFFFF) {
- long tval = (jiffies - ifa->tstamp)/HZ;
- ci.ifa_prefered -= tval;
- if (ci.ifa_valid != 0xFFFFFFFF)
- ci.ifa_valid -= tval;
- }
- 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_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
- {
- int idx, ip_idx;
- int s_idx, s_ip_idx;
- struct inet6_ifaddr *ifa;
- s_idx = cb->args[0];
- s_ip_idx = ip_idx = cb->args[1];
- for (idx=0; idx < IN6_ADDR_HSIZE; idx++) {
- if (idx < s_idx)
- continue;
- if (idx > s_idx)
- s_ip_idx = 0;
- read_lock_bh(&addrconf_hash_lock);
- for (ifa=inet6_addr_lst[idx], ip_idx = 0; ifa;
- ifa = ifa->lst_next, ip_idx++) {
- if (ip_idx < s_ip_idx)
- continue;
- if (inet6_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).pid,
- cb->nlh->nlmsg_seq, RTM_NEWADDR) <= 0) {
- read_unlock_bh(&addrconf_hash_lock);
- goto done;
- }
- }
- read_unlock_bh(&addrconf_hash_lock);
- }
- done:
- cb->args[0] = idx;
- cb->args[1] = ip_idx;
- return skb->len;
- }
- static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
- {
- struct sk_buff *skb;
- int size = NLMSG_SPACE(sizeof(struct ifaddrmsg)+128);
- skb = alloc_skb(size, GFP_ATOMIC);
- if (!skb) {
- netlink_set_err(rtnl, 0, RTMGRP_IPV6_IFADDR, ENOBUFS);
- return;
- }
- if (inet6_fill_ifaddr(skb, ifa, 0, 0, event) < 0) {
- kfree_skb(skb);
- netlink_set_err(rtnl, 0, RTMGRP_IPV6_IFADDR, EINVAL);
- return;
- }
- NETLINK_CB(skb).dst_groups = RTMGRP_IPV6_IFADDR;
- netlink_broadcast(rtnl, skb, 0, RTMGRP_IPV6_IFADDR, GFP_ATOMIC);
- }
- static struct rtnetlink_link inet6_rtnetlink_table[RTM_MAX-RTM_BASE+1] =
- {
- { NULL, NULL, },
- { NULL, NULL, },
- { NULL, NULL, },
- { NULL, NULL, },
- { inet6_rtm_newaddr, NULL, },
- { inet6_rtm_deladdr, NULL, },
- { NULL, inet6_dump_ifaddr, },
- { NULL, NULL, },
- { inet6_rtm_newroute, NULL, },
- { inet6_rtm_delroute, NULL, },
- { inet6_rtm_getroute, inet6_dump_fib, },
- { NULL, NULL, },
- };
- static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
- {
- inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
- switch (event) {
- case RTM_NEWADDR:
- ip6_rt_addr_add(&ifp->addr, ifp->idev->dev);
- break;
- case RTM_DELADDR:
- addrconf_leave_solict(ifp->idev->dev, &ifp->addr);
- if (!ipv6_chk_addr(&ifp->addr, ifp->idev->dev))
- ip6_rt_addr_del(&ifp->addr, ifp->idev->dev);
- break;
- }
- }
- #ifdef CONFIG_SYSCTL
- static
- int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
- void *buffer, size_t *lenp)
- {
- int *valp = ctl->data;
- int val = *valp;
- int ret;
- ret = proc_dointvec(ctl, write, filp, buffer, lenp);
- if (write && *valp != val && valp != &ipv6_devconf_dflt.forwarding) {
- struct inet6_dev *idev = NULL;
- if (valp != &ipv6_devconf.forwarding) {
- struct net_device *dev = dev_get_by_index(ctl->ctl_name);
- if (dev) {
- idev = in6_dev_get(dev);
- dev_put(dev);
- }
- if (idev == NULL)
- return ret;
- } else
- ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
- addrconf_forward_change(idev);
- if (*valp)
- rt6_purge_dflt_routers(0);
- if (idev)
- in6_dev_put(idev);
- }
- return ret;
- }
- static struct addrconf_sysctl_table
- {
- struct ctl_table_header *sysctl_header;
- ctl_table addrconf_vars[11];
- 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 = {
- NULL,
- {{NET_IPV6_FORWARDING, "forwarding",
- &ipv6_devconf.forwarding, sizeof(int), 0644, NULL,
- &addrconf_sysctl_forward},
- {NET_IPV6_HOP_LIMIT, "hop_limit",
- &ipv6_devconf.hop_limit, sizeof(int), 0644, NULL,
- &proc_dointvec},
- {NET_IPV6_MTU, "mtu",
- &ipv6_devconf.mtu6, sizeof(int), 0644, NULL,
- &proc_dointvec},
- {NET_IPV6_ACCEPT_RA, "accept_ra",
- &ipv6_devconf.accept_ra, sizeof(int), 0644, NULL,
- &proc_dointvec},
- {NET_IPV6_ACCEPT_REDIRECTS, "accept_redirects",
- &ipv6_devconf.accept_redirects, sizeof(int), 0644, NULL,
- &proc_dointvec},
- {NET_IPV6_AUTOCONF, "autoconf",
- &ipv6_devconf.autoconf, sizeof(int), 0644, NULL,
- &proc_dointvec},
- {NET_IPV6_DAD_TRANSMITS, "dad_transmits",
- &ipv6_devconf.dad_transmits, sizeof(int), 0644, NULL,
- &proc_dointvec},
- {NET_IPV6_RTR_SOLICITS, "router_solicitations",
- &ipv6_devconf.rtr_solicits, sizeof(int), 0644, NULL,
- &proc_dointvec},
- {NET_IPV6_RTR_SOLICIT_INTERVAL, "router_solicitation_interval",
- &ipv6_devconf.rtr_solicit_interval, sizeof(int), 0644, NULL,
- &proc_dointvec_jiffies},
- {NET_IPV6_RTR_SOLICIT_DELAY, "router_solicitation_delay",
- &ipv6_devconf.rtr_solicit_delay, sizeof(int), 0644, NULL,
- &proc_dointvec_jiffies},
- {0}},
- {{NET_PROTO_CONF_ALL, "all", NULL, 0, 0555, addrconf_sysctl.addrconf_vars},{0}},
- {{NET_IPV6_CONF, "conf", NULL, 0, 0555, addrconf_sysctl.addrconf_dev},{0}},
- {{NET_IPV6, "ipv6", NULL, 0, 0555, addrconf_sysctl.addrconf_conf_dir},{0}},
- {{CTL_NET, "net", NULL, 0, 0555, addrconf_sysctl.addrconf_proto_dir},{0}}
- };
- 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;
- t = kmalloc(sizeof(*t), GFP_KERNEL);
- if (t == NULL)
- return;
- memcpy(t, &addrconf_sysctl, sizeof(*t));
- for (i=0; i<sizeof(t->addrconf_vars)/sizeof(t->addrconf_vars[0])-1; i++) {
- t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
- t->addrconf_vars[i].de = NULL;
- }
- if (dev) {
- t->addrconf_dev[0].procname = dev->name;
- t->addrconf_dev[0].ctl_name = dev->ifindex;
- } else {
- t->addrconf_dev[0].procname = "default";
- t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
- }
- 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)
- kfree(t);
- else
- p->sysctl = t;
- }
- 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);
- }
- }
- #endif
- /*
- * Device notifier
- */
- int register_inet6addr_notifier(struct notifier_block *nb)
- {
- return notifier_chain_register(&inet6addr_chain, nb);
- }
- int unregister_inet6addr_notifier(struct notifier_block *nb)
- {
- return notifier_chain_unregister(&inet6addr_chain,nb);
- }
- /*
- * Init / cleanup code
- */
- void __init addrconf_init(void)
- {
- #ifdef MODULE
- struct net_device *dev;
- /* This takes sense only during module load. */
- rtnl_lock();
- for (dev = dev_base; dev; dev = dev->next) {
- if (!(dev->flags&IFF_UP))
- continue;
- switch (dev->type) {
- case ARPHRD_LOOPBACK:
- init_loopback(dev);
- break;
- case ARPHRD_ETHER:
- case ARPHRD_FDDI:
- case ARPHRD_IEEE802_TR:
- addrconf_dev_config(dev);
- break;
- default:;
- /* Ignore all other */
- }
- }
- rtnl_unlock();
- #endif
- #ifdef CONFIG_PROC_FS
- proc_net_create("if_inet6", 0, iface_proc_info);
- #endif
-
- addr_chk_timer.expires = jiffies + ADDR_CHECK_FREQUENCY;
- add_timer(&addr_chk_timer);
- 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
- }
- #ifdef MODULE
- void addrconf_cleanup(void)
- {
- struct net_device *dev;
- struct inet6_dev *idev;
- struct inet6_ifaddr *ifa;
- int i;
- 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);
- }
- /*
- * 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=%pn", 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
- }
- #endif /* MODULE */