From 58c4fb86eabcbc385d954843a635b7f4327be6b0 Mon Sep 17 00:00:00 2001 From: YOSHIFUJI Hideaki Date: Wed, 21 Dec 2005 22:56:42 +0900 Subject: [IPV6]: Flag RTF_ANYCAST for anycast routes. Signed-off-by: YOSHIFUJI Hideaki --- include/linux/ipv6_route.h | 1 + net/ipv6/route.c | 13 +++++++++---- 2 files changed, 10 insertions(+), 4 deletions(-) diff --git a/include/linux/ipv6_route.h b/include/linux/ipv6_route.h index e2f935038013b7..d7c41d1d706a30 100644 --- a/include/linux/ipv6_route.h +++ b/include/linux/ipv6_route.h @@ -18,6 +18,7 @@ fallback, no routers on link */ #define RTF_ADDRCONF 0x00040000 /* addrconf route - RA */ #define RTF_PREFIX_RT 0x00080000 /* A prefix only route - RA */ +#define RTF_ANYCAST 0x00100000 /* Anycast */ #define RTF_NONEXTHOP 0x00200000 /* route with no nexthop */ #define RTF_EXPIRES 0x00400000 diff --git a/net/ipv6/route.c b/net/ipv6/route.c index 7c68bfbee36193..66140f13d11971 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -413,11 +413,14 @@ static struct rt6_info *rt6_cow(struct rt6_info *ort, struct in6_addr *daddr, rt = ip6_rt_copy(ort); if (rt) { - ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); - - if (!(rt->rt6i_flags&RTF_GATEWAY)) + if (!(rt->rt6i_flags&RTF_GATEWAY)) { + if (rt->rt6i_dst.plen != 128 && + ipv6_addr_equal(&rt->rt6i_dst.addr, daddr)) + rt->rt6i_flags |= RTF_ANYCAST; ipv6_addr_copy(&rt->rt6i_gateway, daddr); + } + ipv6_addr_copy(&rt->rt6i_dst.addr, daddr); rt->rt6i_dst.plen = 128; rt->rt6i_flags |= RTF_CACHE; rt->u.dst.flags |= DST_HOST; @@ -1413,7 +1416,9 @@ struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev, rt->u.dst.obsolete = -1; rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP; - if (!anycast) + if (anycast) + rt->rt6i_flags |= RTF_ANYCAST; + else rt->rt6i_flags |= RTF_LOCAL; rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway); if (rt->rt6i_nexthop == NULL) { -- cgit 1.2.3-korg From 8de3351e6e0a1081fbf6864ae37839e327699a08 Mon Sep 17 00:00:00 2001 From: YOSHIFUJI Hideaki Date: Wed, 21 Dec 2005 22:57:06 +0900 Subject: [IPV6]: Try not to send icmp to anycast address. Signed-off-by: YOSHIFUJI Hideaki --- net/ipv6/icmp.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c index 34a332225c1749..6ec6a2b549bbd6 100644 --- a/net/ipv6/icmp.c +++ b/net/ipv6/icmp.c @@ -328,8 +328,10 @@ void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info, iif = skb->dev->ifindex; /* - * Must not send if we know that source is Anycast also. - * for now we don't know that. + * Must not send error if the source does not uniquely + * identify a single node (RFC2463 Section 2.4). + * We check unspecified / multicast addresses here, + * and anycast addresses will be checked later. */ if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: addr_any/mcast source\n"); @@ -373,6 +375,16 @@ void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info, err = ip6_dst_lookup(sk, &dst, &fl); if (err) goto out; + + /* + * We won't send icmp if the destination is known + * anycast. + */ + if (((struct rt6_info *)dst)->rt6i_flags & RTF_ANYCAST) { + LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: acast source\n"); + goto out_dst_release; + } + if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) goto out; -- cgit 1.2.3-korg From 3c21edbd113788b110116141c8078623a0900b6a Mon Sep 17 00:00:00 2001 From: YOSHIFUJI Hideaki Date: Wed, 21 Dec 2005 22:57:24 +0900 Subject: [IPV6]: Defer IPv6 device initialization until the link becomes ready. NETDEV_UP might be sent even if the link attached to the interface was not ready. DAD does not make sense in such case, so we won't do so. After interface Signed-off-by: YOSHIFUJI Hideaki --- include/net/if_inet6.h | 1 + net/ipv6/addrconf.c | 74 +++++++++++++++++++++++++++++++++++++++++++------- 2 files changed, 65 insertions(+), 10 deletions(-) diff --git a/include/net/if_inet6.h b/include/net/if_inet6.h index e97a9accb71df3..d8234f9bd4c418 100644 --- a/include/net/if_inet6.h +++ b/include/net/if_inet6.h @@ -24,6 +24,7 @@ #define IF_RA_MANAGED 0x40 #define IF_RA_RCVD 0x20 #define IF_RS_SENT 0x10 +#define IF_READY 0x80000000 /* prefix flags */ #define IF_PREFIX_ONLINK 0x01 diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index 4ea8cf7c0cc443..d012f6ac70409f 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -388,6 +388,9 @@ 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); @@ -1215,10 +1218,8 @@ 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); @@ -1244,6 +1245,12 @@ 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. */ @@ -2136,6 +2143,37 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event, 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); + + } + switch(dev->type) { case ARPHRD_SIT: addrconf_sit_config(dev); @@ -2186,8 +2224,7 @@ 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) { @@ -2268,7 +2305,7 @@ 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 @@ -2377,11 +2414,20 @@ 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); @@ -2390,7 +2436,6 @@ 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) @@ -2407,8 +2452,17 @@ 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) + addrconf_dad_kick(ifp); + else { + /* + * 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); + } spin_unlock_bh(&ifp->lock); out: -- cgit 1.2.3-korg From c5e33bddd3c798f681f8f3027270127be6b61a3b Mon Sep 17 00:00:00 2001 From: YOSHIFUJI Hideaki Date: Wed, 21 Dec 2005 22:57:44 +0900 Subject: [IPV6]: Run DAD when the link becomes ready. If the link was not available when the interface was created, run DAD for pending tentative addresses when the link becomes ready. Signed-off-by: YOSHIFUJI Hideaki --- net/ipv6/addrconf.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index d012f6ac70409f..f6ead6a843e3b9 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); @@ -418,6 +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; @@ -2140,6 +2142,7 @@ 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: @@ -2172,6 +2175,7 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event, "link becomes ready\n", dev->name); + run_pending = 1; } switch(dev->type) { @@ -2190,6 +2194,9 @@ 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. @@ -2546,6 +2553,22 @@ 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; -- cgit 1.2.3-korg From 6b3ae80a63e47f6e97d68a1ddd520e3509e62821 Mon Sep 17 00:00:00 2001 From: YOSHIFUJI Hideaki Date: Wed, 21 Dec 2005 22:58:01 +0900 Subject: [IPV6]: Don't select a tentative address as a source address. A tentative address is not considered "assigned to an interface" in the traditional sense (RFC2462 Section 4). Don't try to select such an address for the source address. Signed-off-by: YOSHIFUJI Hideaki --- net/ipv6/addrconf.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index f6ead6a843e3b9..fd03c39443663d 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -908,11 +908,18 @@ 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 -- cgit 1.2.3-korg