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Date: Fri, 13 Dec 2013 11:48:35 -0500
From: Vlad Yasevich <vyasevich@...il.com>
To: Denys Vlasenko <dvlasenk@...hat.com>, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
CC: 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: Re: [patch net-next v3] ipv6: log autoconfiguration failures
On 12/13/2013 10:45 AM, Denys Vlasenko wrote:
> 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.
>
> v3: changed pr_debug's to pr_warn's.
>
> 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 3c3425e..0b354f0 100644
> --- a/net/ipv6/addrconf.c
> +++ b/net/ipv6/addrconf.c
> @@ -1694,8 +1694,11 @@ 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_warn("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);
>
> @@ -1725,8 +1728,11 @@ 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_warn("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;
> @@ -1736,8 +1742,11 @@ 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_warn("IPv6 addrconf: %s: address length %d != %s\n",
> + dev->name, dev->addr_len, "FWNET_ALEN");
> return -1;
> + }
>
> ha = (union fwnet_hwaddr *)dev->dev_addr;
>
> @@ -1749,8 +1758,11 @@ 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_warn("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;
> @@ -1758,17 +1770,25 @@ 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_warn("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_warn("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) ||
> @@ -1785,13 +1805,14 @@ 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_warn("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)
> @@ -1825,6 +1846,8 @@ static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
> case ARPHRD_TUNNEL6:
> return addrconf_ifid_ip6tnl(eui, dev);
> }
> + pr_warn("IPv6 addrconf: %s: dev->type %d is not supported\n",
> + dev->name, dev->type);
> return -1;
> }
This one should probably be a pr_debug or counter. This is not a
critical issue and it makes no sense to spam the log if IPv6 is not
supported on a particular interface.
>
> @@ -1842,6 +1865,10 @@ static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
> }
> }
> read_unlock_bh(&idev->lock);
> + if (err)
> + pr_warn("IPv6 addrconf: "
> + "%s: no link-local address to inherit\n",
> + idev->dev->name);
> return err;
> }
This shouldn't be a warning either. This is called if
ipv6_generate_eui64() fails and we'd know if it failed for a good
reason. If that failed, we very likely do not have any other link-local
addresses and would know of any error conditions.
If by some chance, there are unsolicited RAs on the link, you'd end up
spamming the log.
-vlad
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