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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

15
tap.c
View file

@ -845,13 +845,13 @@ static int tun_ns_fd = -1;
/**
* tap_sock_init_tun_ns() - Create tuntap fd in namespace, bring up loopback
* @target_pid: Pointer to target PID
* @c: Execution context
*/
static int tap_sock_init_tun_ns(void *target_pid)
static int tap_sock_init_tun_ns(void *c)
{
int fd;
if (ns_enter(*(int *)target_pid))
if (ns_enter((struct ctx *)c))
goto fail;
if ((fd = open("/dev/net/tun", O_RDWR | O_NONBLOCK)) < 0)
@ -883,12 +883,10 @@ fail:
/**
* struct tap_sock_if_up_ns_arg - Arguments for tap_sock_if_up_ns()
* @c: Execution context
* @target_pid: Target namespace PID
* @ifname: Interface name of tap device
*/
struct tap_sock_if_up_ns_arg {
struct ctx *c;
int target_pid;
char ifname[IFNAMSIZ];
};
@ -906,7 +904,7 @@ static int tap_sock_if_up_ns(void *arg)
a = (struct tap_sock_if_up_ns_arg *)arg;
if (ns_enter(a->target_pid))
if (ns_enter(a->c))
return 0;
if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
@ -955,7 +953,7 @@ static void tap_sock_init_tun(struct ctx *c)
struct ifreq ifr = { .ifr_flags = IFF_TAP | IFF_NO_PI };
struct tap_sock_if_up_ns_arg ifup_arg;
NS_CALL(tap_sock_init_tun_ns, &c->pasta_pid);
NS_CALL(tap_sock_init_tun_ns, c);
if (tun_ns_fd == -1) {
err("Failed to open tun socket in namespace");
exit(EXIT_FAILURE);
@ -968,11 +966,10 @@ static void tap_sock_init_tun(struct ctx *c)
}
strncpy(ifup_arg.ifname, c->pasta_ifn, IFNAMSIZ);
ifup_arg.target_pid = c->pasta_pid;
ifup_arg.c = c;
NS_CALL(tap_sock_if_up_ns, (void *)&ifup_arg);
pcap_init(c, c->pasta_pid);
pcap_init(c, c->pasta_netns_fd);
c->fd_tap = tun_ns_fd;
}