diff options
Diffstat (limited to 'net/ipv6/addrconf.c')
-rw-r--r-- | net/ipv6/addrconf.c | 154 |
1 files changed, 127 insertions, 27 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index ddcf7754eec2..a60585fd85ad 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -137,6 +137,7 @@ 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); @@ -379,8 +380,8 @@ static struct inet6_dev * ipv6_add_dev(struct net_device *dev) dev->type == ARPHRD_NONE || dev->type == ARPHRD_SIT) { printk(KERN_INFO - "Disabled Privacy Extensions on device %p(%s)\n", - dev, dev->name); + "%s: Disabled Privacy Extensions\n", + dev->name); ndev->cnf.use_tempaddr = -1; } else { in6_dev_hold(ndev); @@ -388,6 +389,9 @@ static struct inet6_dev * ipv6_add_dev(struct net_device *dev) } #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); @@ -415,6 +419,7 @@ static struct inet6_dev * ipv6_find_idev(struct net_device *dev) if ((idev = ipv6_add_dev(dev)) == NULL) return NULL; } + if (dev->flags&IFF_UP) ipv6_mc_up(idev); return idev; @@ -634,8 +639,7 @@ static void ipv6_del_addr(struct inet6_ifaddr *ifp) } #endif - for (ifap = &idev->addr_list; (ifa=*ifap) != NULL; - ifap = &ifa->if_next) { + for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) { if (ifa == ifp) { *ifap = ifa->if_next; __in6_ifa_put(ifp); @@ -643,6 +647,7 @@ static void ipv6_del_addr(struct inet6_ifaddr *ifp) 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)) { @@ -666,6 +671,7 @@ static void ipv6_del_addr(struct inet6_ifaddr *ifp) } } } + ifap = &ifa->if_next; } write_unlock_bh(&idev->lock); @@ -903,11 +909,18 @@ int ipv6_dev_get_saddr(struct net_device *daddr_dev, score.addr_type = __ipv6_addr_type(&ifa->addr); - /* Rule 0: Candidate Source Address (section 4) + /* 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 @@ -985,6 +998,8 @@ int ipv6_dev_get_saddr(struct net_device *daddr_dev, } /* Rule 4: Prefer home address -- not implemented yet */ + if (hiscore.rule < 4) + hiscore.rule++; /* Rule 5: Prefer outgoing interface */ if (hiscore.rule < 5) { @@ -1045,9 +1060,10 @@ int ipv6_dev_get_saddr(struct net_device *daddr_dev, } #endif /* Rule 8: Use longest matching prefix */ - if (hiscore.rule < 8) + if (hiscore.rule < 8) { hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr); - score.rule++; + hiscore.rule++; + } score.matchlen = ipv6_addr_diff(&ifa->addr, daddr); if (score.matchlen > hiscore.matchlen) { score.rule = 8; @@ -1212,10 +1228,8 @@ int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) /* Gets referenced address, destroys ifaddr */ -void addrconf_dad_failure(struct inet6_ifaddr *ifp) +void addrconf_dad_stop(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); @@ -1241,6 +1255,12 @@ void addrconf_dad_failure(struct inet6_ifaddr *ifp) 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. */ @@ -1593,9 +1613,17 @@ void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) not good. */ if (valid_lft >= 0x7FFFFFFF/HZ) - rt_expires = 0; + rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ); else - rt_expires = jiffies + valid_lft * HZ; + 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; @@ -1607,12 +1635,12 @@ void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len) ip6_del_rt(rt, NULL, NULL, NULL); rt = NULL; } else { - rt->rt6i_expires = rt_expires; + rt->rt6i_expires = jiffies + rt_expires; } } } else if (valid_lft) { addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, - dev, rt_expires, RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT); + dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT); } if (rt) dst_release(&rt->u.dst); @@ -2122,9 +2150,42 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event, { 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; + } + } 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); @@ -2141,6 +2202,9 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event, 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. @@ -2175,8 +2239,7 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event, */ addrconf_ifdown(dev, event != NETDEV_DOWN); break; - case NETDEV_CHANGE: - break; + case NETDEV_CHANGENAME: #ifdef CONFIG_SYSCTL if (idev) { @@ -2257,7 +2320,7 @@ static int addrconf_ifdown(struct net_device *dev, int how) /* Step 3: clear flags for stateless addrconf */ if (how != 1) - idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD); + idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); /* Step 4: clear address list */ #ifdef CONFIG_IPV6_PRIVACY @@ -2366,11 +2429,20 @@ out: /* * 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; - unsigned long rand_num; addrconf_join_solict(dev, &ifp->addr); @@ -2379,7 +2451,6 @@ static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) flags); net_srandom(ifp->addr.s6_addr32[3]); - rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); read_lock_bh(&idev->lock); if (ifp->dead) @@ -2396,9 +2467,19 @@ static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags) return; } - ifp->probes = idev->cnf.dad_transmits; - addrconf_mod_timer(ifp, AC_DAD, rand_num); - + 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); @@ -2481,6 +2562,22 @@ static void addrconf_dad_completed(struct inet6_ifaddr *ifp) } } +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; @@ -2626,7 +2723,7 @@ static void addrconf_verify(unsigned long foo) for (i=0; i < IN6_ADDR_HSIZE; i++) { restart: - write_lock(&addrconf_hash_lock); + read_lock(&addrconf_hash_lock); for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) { unsigned long age; #ifdef CONFIG_IPV6_PRIVACY @@ -2648,7 +2745,7 @@ restart: if (age >= ifp->valid_lft) { spin_unlock(&ifp->lock); in6_ifa_hold(ifp); - write_unlock(&addrconf_hash_lock); + read_unlock(&addrconf_hash_lock); ipv6_del_addr(ifp); goto restart; } else if (age >= ifp->prefered_lft) { @@ -2667,7 +2764,7 @@ restart: if (deprecate) { in6_ifa_hold(ifp); - write_unlock(&addrconf_hash_lock); + read_unlock(&addrconf_hash_lock); ipv6_ifa_notify(0, ifp); in6_ifa_put(ifp); @@ -2685,7 +2782,10 @@ restart: in6_ifa_hold(ifp); in6_ifa_hold(ifpub); spin_unlock(&ifp->lock); - write_unlock(&addrconf_hash_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); @@ -2702,7 +2802,7 @@ restart: spin_unlock(&ifp->lock); } } - write_unlock(&addrconf_hash_lock); + read_unlock(&addrconf_hash_lock); } addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next; |