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pasta: Allow specifying paths and names of namespaces

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Based on a patch from Giuseppe Scrivano, this adds the ability to:

- specify paths and names of target namespaces to join, instead of
  a PID, also for user namespaces, with --userns

- request to join or create a network namespace only, without
  entering or creating a user namespace, with --netns-only

- specify the base directory for netns mountpoints, with --nsrun-dir

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
[sbrivio: reworked logic to actually join the given namespaces when
 they're not created, implemented --netns-only and --nsrun-dir,
 updated pasta demo script and man page]
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Giuseppe Scrivano 2021-09-29 16:11:06 +02:00 • committed by Stefano Brivio
parent ab32838022
commit 9a175cc2ce
12 changed files with 240 additions and 79 deletions

4
udp.c
View file

@ -516,7 +516,7 @@ static int udp_splice_connect_ns(void *arg)
a = (struct udp_splice_connect_ns_arg *)arg;
ns_enter(a->c->pasta_pid);
ns_enter(a->c);
a->s = udp_splice_connect(a->c, a->v6, a->bound_sock, a->src, a->dst,
UDP_BACK_TO_INIT);
@ -1004,7 +1004,7 @@ int udp_sock_init_ns(void *arg)
struct ctx *c = (struct ctx *)arg;
in_port_t dst;
ns_enter(c->pasta_pid);
ns_enter(c);
for (dst = 0; dst < USHRT_MAX; dst++) {
if (!bitmap_isset(c->udp.port_to_init, dst))