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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

18
conf.c
View file

@ -902,6 +902,8 @@ pasta_opts:
info( " --config-net Configure tap interface in namespace");
info( " --no-copy-routes DEPRECATED:");
info( " Don't copy all routes to namespace");
info( " --no-copy-addrs DEPRECATED:");
info( " Don't copy all addresses to namespace");
info( " --ns-mac-addr ADDR Set MAC address on tap interface");
exit(EXIT_FAILURE);
@ -1178,6 +1180,7 @@ void conf(struct ctx *c, int argc, char **argv)
{"outbound-if6", required_argument, NULL, 16 },
{"config-net", no_argument, NULL, 17 },
{"no-copy-routes", no_argument, NULL, 18 },
{"no-copy-addrs", no_argument, NULL, 19 },
{ 0 },
};
struct get_bound_ports_ns_arg ns_ports_arg = { .c = c };
@ -1349,6 +1352,13 @@ void conf(struct ctx *c, int argc, char **argv)
warn("--no-copy-routes will be dropped soon");
c->no_copy_routes = 1;
break;
case 19:
if (c->mode != MODE_PASTA)
die("--no-copy-addrs is for pasta mode only");
warn("--no-copy-addrs will be dropped soon");
c->no_copy_addrs = 1;
break;
case 'd':
if (c->debug)
die("Multiple --debug options given");
@ -1634,8 +1644,12 @@ void conf(struct ctx *c, int argc, char **argv)
if (*c->sock_path && c->fd_tap >= 0)
die("Options --socket and --fd are mutually exclusive");
if (c->mode == MODE_PASTA && c->no_copy_routes && !c->pasta_conf_ns)
die("Option --no-copy-routes needs --config-net");
if (c->mode == MODE_PASTA && !c->pasta_conf_ns) {
if (c->no_copy_routes)
die("Option --no-copy-routes needs --config-net");
if (c->no_copy_addrs)
die("Option --no-copy-addrs needs --config-net");
}
if (!ifi4 && *c->ip4.ifname_out)
ifi4 = if_nametoindex(c->ip4.ifname_out);