[PATCH] dracut-module-setup.sh: pass ip=either6 param for ipv6

[Pingfan Liu]

Kdump always use _proto=dhcp for both ipv4 and ipv6.  But for ipv6
the dhcp address assignment is not like ipv4, there are different ways
for it, stateless and stateful, see below document:
https://fedoraproject.org/wiki/IPv6Guide

In case stateless, kernel can do the address assignment, dracut use
_proto=auto6;  for stateful case, dracut use _proto=dhcp6.
But it is hard to decide whether stateless or stateful takes effect,
hence, dracut introduces ip=either6 option, which can try both of these
method automatically for us. For detail, refer to dracut:
commit 67354ee 40network: introduce ip=either6 option

We do not see bug reports before because for the most auto6 cases
kernel assign ip address before dhclient, kdump just happened to work.

Signed-off-by: Pingfan Liu <piliu(a)redhat.com&gt;
---
 dracut-module-setup.sh | 2 ++
 kexec-tools.spec       | 2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/dracut-module-setup.sh b/dracut-module-setup.sh
index 7505e81..f87617a 100755
--- a/dracut-module-setup.sh
+++ b/dracut-module-setup.sh
@@ -293,6 +293,8 @@ kdump_setup_netdev() {
     _static=$(kdump_static_ip $_netdev $_srcaddr)
     if [ -n "$_static" ]; then
         _proto=none
+    elif is_ipv6_address $_srcaddr; then
+        _proto=either6
     else
         _proto=dhcp
     fi
diff --git a/kexec-tools.spec b/kexec-tools.spec
index 5712acb..cc546d2 100644
--- a/kexec-tools.spec
+++ b/kexec-tools.spec
@@ -50,7 +50,7 @@ Requires(post): systemd-units
 Requires(preun): systemd-units
 Requires(postun): systemd-units
 Requires(pre): coreutils sed zlib 
-Requires: dracut >= 046-7
+Requires: dracut >= 047-34.git20180604
 Requires: dracut-network >= 044-117
 Requires: ethtool
 BuildRequires: zlib-devel zlib zlib-static elfutils-devel-static glib2-devel bzip2-devel
ncurses-devel bison flex lzo-devel snappy-devel
-- 
2.7.4

[Dave Young]

On 06/22/18 at 10:41am, Pingfan Liu wrote:
>  Kdump always use _proto=dhcp for both ipv4 and ipv6.  But for ipv6
>  the dhcp address assignment is not like ipv4, there are different ways
>  for it, stateless and stateful, see below document:
>  https://fedoraproject.org/wiki/IPv6Guide
>  
>  In case stateless, kernel can do the address assignment, dracut use
>  _proto=auto6;  for stateful case, dracut use _proto=dhcp6.
>  But it is hard to decide whether stateless or stateful takes effect,
>  hence, dracut introduces ip=either6 option, which can try both of these
>  method automatically for us. For detail, refer to dracut:
>  commit 67354ee 40network: introduce ip=either6 option
>  
>  We do not see bug reports before because for the most auto6 cases
>  kernel assign ip address before dhclient, kdump just happened to work.
>  
>  Signed-off-by: Pingfan Liu <piliu(a)redhat.com&gt;
>  ---
>   dracut-module-setup.sh | 2 ++
>   kexec-tools.spec       | 2 +-
>   2 files changed, 3 insertions(+), 1 deletion(-)
>  
>  diff --git a/dracut-module-setup.sh b/dracut-module-setup.sh
>  index 7505e81..f87617a 100755
>  --- a/dracut-module-setup.sh
>  +++ b/dracut-module-setup.sh
>  @@ -293,6 +293,8 @@ kdump_setup_netdev() {
>       _static=$(kdump_static_ip $_netdev $_srcaddr)
>       if [ -n "$_static" ]; then
>           _proto=none
>  +    elif is_ipv6_address $_srcaddr; then
>  +        _proto=either6
>       else
>           _proto=dhcp
>       fi
>  diff --git a/kexec-tools.spec b/kexec-tools.spec
>  index 5712acb..cc546d2 100644
>  --- a/kexec-tools.spec
>  +++ b/kexec-tools.spec
>  @@ -50,7 +50,7 @@ Requires(post): systemd-units
>   Requires(preun): systemd-units
>   Requires(postun): systemd-units
>   Requires(pre): coreutils sed zlib 
>  -Requires: dracut >= 046-7
>  +Requires: dracut >= 047-34.git20180604
>   Requires: dracut-network >= 044-117
>   Requires: ethtool
>   BuildRequires: zlib-devel zlib zlib-static elfutils-devel-static glib2-devel bzip2-devel
> ncurses-devel bison flex lzo-devel snappy-devel
>  -- 
>  2.7.4
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Ack