On Fri,  2 Jun 2023 15:02:02 +1000
David Gibson <david(a)gibson.dropbear.id.au> wrote:

...
  a7359f094898 ("conf: Don't exit if sourced
default route has no gateway")
 was supposed to allow passt/pasta to run even if given a template interface
 which has no default gateway.  However a mistake in the patch means it
 still requires the gateway, but doesn't require a global address for the
 guest which we really do need.
 
 This is one part (but not the only part) of the problem seen in
 https://bugs.passt.top/show_bug.cgi?id=50.

 Fixes: a7359f094898 
Thanks! Applied with:

Reported-by: Justin Jereza <justinjereza(a)gmail.com>
Fixes: a7359f094898 ("conf: Don't exit if sourced default route has no
gateway")
Link: https://bugs.passt.top/show_bug.cgi?id=50
Signed-off-by: Stefano Brivio <sbrivio(a)redhat.com>

If it helps (not that you need to care, really):
  git show -s --abbrev=12 --pretty=format:"Fixes: %h (\"%s\")"
"${sha}"

or... scripts:
  https://lore.kernel.org/all/20190220205910.7bd7fd40@redhat.com/
  https://lore.kernel.org/all/20190220213729.49deb54f@redhat.com/

...
  Signed-off-by: David Gibson
<david(a)gibson.dropbear.id.au>

 ---
  conf.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)
 
 diff --git a/conf.c b/conf.c
 index d8414fe7..ffff235b 100644
 --- a/conf.c
 +++ b/conf.c
 @@ -708,7 +708,7 @@ static unsigned int conf_ip6(unsigned int ifi,
  	if (MAC_IS_ZERO(mac))
  		nl_link(0, ifi, mac, 0, 0);
  
 -	if (IN6_IS_ADDR_UNSPECIFIED(&ip6->gw) ||
 +	if (IN6_IS_ADDR_UNSPECIFIED(&ip6->addr) ||
  	    IN6_IS_ADDR_UNSPECIFIED(&ip6->addr_ll) ||
  	    MAC_IS_ZERO(mac))
  		return 0; 
-- 
Stefano