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conf, pasta: With --config-net, copy all addresses by default

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Use the newly-introduced NL_DUP mode for nl_addr() to copy all the
addresses associated to the template interface in the outer
namespace, unless --no-copy-addrs (also implied by -a) is given.

This option is introduced as deprecated right away: it's not expected
to be of any use, but it's helpful to keep it around for a while to
debug any suspected issue with this change.

This is done mostly for consistency with routes. It might partially
cover the issue at:
  https://bugs.passt.top/show_bug.cgi?id=47
  Support multiple addresses per address family

for some use cases, but not the originally intended one: we'll still
use a single outbound address (unless the routing table specifies
different preferred source addresses depending on the destination),
regardless of the address used in the target namespace.

Link: https://bugs.passt.top/show_bug.cgi?id=47
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Stefano Brivio 2023-05-14 19:12:09 +02:00
parent e89da3cf03
commit cc9d16758b
4 changed files with 35 additions and 4 deletions

2
passt.h
View file

@ -183,6 +183,7 @@ struct ip6_ctx {
* @pasta_ifn: Index of namespace interface for pasta
* @pasta_conf_ns: Configure namespace after creating it
* @no_copy_routes: Don't copy all routes when configuring target namespace
* @no_copy_addrs: Don't copy all addresses when configuring namespace
* @no_tcp: Disable TCP operation
* @tcp: Context for TCP protocol handler
* @no_tcp: Disable UDP operation
@ -242,6 +243,7 @@ struct ctx {
unsigned int pasta_ifi;
int pasta_conf_ns;
int no_copy_routes;
int no_copy_addrs;
int no_tcp;
struct tcp_ctx tcp;