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Date: Mon, 9 Dec 2013 17:26:48 +0100
From: Denys Vlasenko <dvlasenk@...hat.com>
To: netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Denys Vlasenko <dvlasenk@...hat.com>, davem@...emloft.net,
Alexey Kuznetsov <kuznet@....inr.ac.ru>,
James Morris <jmorris@...ei.org>,
Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
Patrick McHardy <kaber@...sh.net>, jpirko@...hat.com
Subject: [patch net-next] ipv6: log autoconfiguration failures
If ipv6 auto-configuration does not work, currently it's hard
to track what's going on. This change adds log messages
(at debug level) on every code path where ipv6 autoconf fails.
Signed-off-by: Denys Vlasenko <dvlasenk@...hat.com>
---
net/ipv6/addrconf.c | 45 ++++++++++++++++++++++++++++++++++++---------
1 file changed, 36 insertions(+), 9 deletions(-)
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 5087cc5..e75428f 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1692,8 +1692,11 @@ static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
{
- if (dev->addr_len != ETH_ALEN)
+ if (dev->addr_len != ETH_ALEN) {
+ pr_debug("IPv6 addrconf: %s: address length %d != %s\n",
+ dev->name, dev->addr_len, "ETH_ALEN");
return -1;
+ }
memcpy(eui, dev->dev_addr, 3);
memcpy(eui + 5, dev->dev_addr + 3, 3);
@@ -1723,8 +1726,11 @@ static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
{
- if (dev->addr_len != IEEE802154_ADDR_LEN)
+ if (dev->addr_len != IEEE802154_ADDR_LEN) {
+ pr_debug("IPv6 addrconf: %s: address length %d != %s\n",
+ dev->name, dev->addr_len, "IEEE802154_ADDR_LEN");
return -1;
+ }
memcpy(eui, dev->dev_addr, 8);
eui[0] ^= 2;
return 0;
@@ -1734,8 +1740,11 @@ static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
{
union fwnet_hwaddr *ha;
- if (dev->addr_len != FWNET_ALEN)
+ if (dev->addr_len != FWNET_ALEN) {
+ pr_debug("IPv6 addrconf: %s: address length %d != %s\n",
+ dev->name, dev->addr_len, "FWNET_ALEN");
return -1;
+ }
ha = (union fwnet_hwaddr *)dev->dev_addr;
@@ -1747,8 +1756,11 @@ static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
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)
+ if (dev->addr_len != ARCNET_ALEN) {
+ pr_debug("IPv6 addrconf: %s: address length %d != %s\n",
+ dev->name, dev->addr_len, "ARCNET_ALEN");
return -1;
+ }
memset(eui, 0, 7);
eui[7] = *(u8 *)dev->dev_addr;
return 0;
@@ -1756,17 +1768,25 @@ static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
{
- if (dev->addr_len != INFINIBAND_ALEN)
+ if (dev->addr_len != INFINIBAND_ALEN) {
+ pr_debug("IPv6 addrconf: %s: address length %d != %s\n",
+ dev->name, dev->addr_len, "INFINIBAND_ALEN");
return -1;
+ }
memcpy(eui, dev->dev_addr + 12, 8);
eui[0] |= 2;
return 0;
}
-static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
+static int __ipv6_isatap_ifid(u8 *eui, struct net_device *dev)
{
- if (addr == 0)
+ __be32 addr = *(__be32 *)dev->dev_addr;
+
+ if (addr == 0) {
+ pr_debug("IPv6 addrconf: %s: bad dev_addr %pM\n",
+ dev->name, dev->dev_addr);
return -1;
+ }
eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
@@ -1783,13 +1803,14 @@ static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
{
if (dev->priv_flags & IFF_ISATAP)
- return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
+ return __ipv6_isatap_ifid(eui, dev);
+ pr_debug("IPv6 addrconf: %s: IFF_ISATAP is unset\n", dev->name);
return -1;
}
static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
{
- return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
+ return __ipv6_isatap_ifid(eui, dev);
}
static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
@@ -1823,6 +1844,8 @@ static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
case ARPHRD_TUNNEL6:
return addrconf_ifid_ip6tnl(eui, dev);
}
+ pr_debug("IPv6 addrconf: %s: dev->type %d is not supported\n",
+ dev->name, dev->type);
return -1;
}
@@ -1840,6 +1863,10 @@ static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
}
}
read_unlock_bh(&idev->lock);
+ if (err)
+ pr_debug("IPv6 addrconf: "
+ "%s: no link-local address to inherit\n",
+ idev->dev->name);
return err;
}
--
1.8.1.4
--
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