When we want to scan for bound ports in the namespace we use NS_CALL() to
run get_bound_ports() in the namespace. However, the only thing it
actually needed to be in the namespace for was to open the /proc/net file
it was scanning. Since we now always pre-open those, we no longer need
to switch to the namespace for the actual get_bound_ports() calls.
That in turn means that tcp_port_detect() doesn't need to run in the ns
either, and we can just replace it with inline calls to get_bound_ports().
Signed-off-by: David Gibson <david(a)gibson.dropbear.id.au>
---
port_fwd.c | 37 ++-----------------------------------
tcp.c | 38 ++------------------------------------
2 files changed, 4 insertions(+), 71 deletions(-)
diff --git a/port_fwd.c b/port_fwd.c
index a3f69dd..b91eafe 100644
--- a/port_fwd.c
+++ b/port_fwd.c
@@ -109,43 +109,12 @@ void get_bound_ports(struct ctx *c, int ns, uint8_t proto)
}
}
-/**
- * struct get_bound_ports_ns_arg - Arguments for get_bound_ports_ns()
- * @c: Execution context
- * @proto: Protocol number (IPPROTO_TCP or IPPROTO_UDP)
- */
-struct get_bound_ports_ns_arg {
- struct ctx *c;
- uint8_t proto;
-};
-
-/**
- * get_bound_ports_ns() - Get maps of ports in namespace with bound sockets
- * @arg: See struct get_bound_ports_ns_arg
- *
- * Return: 0
- */
-static int get_bound_ports_ns(void *arg)
-{
- struct get_bound_ports_ns_arg *a = (struct get_bound_ports_ns_arg *)arg;
- struct ctx *c = a->c;
-
- if (!c->pasta_netns_fd)
- return 0;
-
- ns_enter(c);
- get_bound_ports(c, 1, a->proto);
-
- return 0;
-}
-
/**
* port_fwd_init() - Initial setup for port forwarding
* @c: Execution context
*/
void port_fwd_init(struct ctx *c)
{
- struct get_bound_ports_ns_arg ns_ports_arg = { .c = c };
const int flags = O_RDONLY | O_CLOEXEC;
c->proc_net_tcp[V4][0] = c->proc_net_tcp[V4][1] = -1;
@@ -156,14 +125,12 @@ void port_fwd_init(struct ctx *c)
if (c->tcp.fwd_in.mode == FWD_AUTO) {
c->proc_net_tcp[V4][1] = open_in_ns(c, "/proc/net/tcp", flags);
c->proc_net_tcp[V6][1] = open_in_ns(c, "/proc/net/tcp6", flags);
- ns_ports_arg.proto = IPPROTO_TCP;
- NS_CALL(get_bound_ports_ns, &ns_ports_arg);
+ get_bound_ports(c, 1, IPPROTO_TCP);
}
if (c->udp.fwd_in.f.mode == FWD_AUTO) {
c->proc_net_udp[V4][1] = open_in_ns(c, "/proc/net/udp", flags);
c->proc_net_udp[V6][1] = open_in_ns(c, "/proc/net/udp6", flags);
- ns_ports_arg.proto = IPPROTO_UDP;
- NS_CALL(get_bound_ports_ns, &ns_ports_arg);
+ get_bound_ports(c, 1, IPPROTO_UDP);
}
if (c->tcp.fwd_out.mode == FWD_AUTO) {
c->proc_net_tcp[V4][0] = open("/proc/net/tcp", flags);
diff --git a/tcp.c b/tcp.c
index a2418ae..63a3c64 100644
--- a/tcp.c
+++ b/tcp.c
@@ -3149,37 +3149,6 @@ int tcp_init(struct ctx *c)
return 0;
}
-/**
- * struct tcp_port_detect_arg - Arguments for tcp_port_detect()
- * @c: Execution context
- * @detect_in_ns: Detect ports bound in namespace, not in init
- */
-struct tcp_port_detect_arg {
- struct ctx *c;
- int detect_in_ns;
-};
-
-/**
- * tcp_port_detect() - Detect ports bound in namespace or init
- * @arg: See struct tcp_port_detect_arg
- *
- * Return: 0
- */
-static int tcp_port_detect(void *arg)
-{
- struct tcp_port_detect_arg *a = (struct tcp_port_detect_arg *)arg;
-
- if (a->detect_in_ns) {
- ns_enter(a->c);
-
- get_bound_ports(a->c, 1, IPPROTO_TCP);
- } else {
- get_bound_ports(a->c, 0, IPPROTO_TCP);
- }
-
- return 0;
-}
-
/**
* struct tcp_port_rebind_arg - Arguments for tcp_port_rebind()
* @c: Execution context
@@ -3268,19 +3237,16 @@ void tcp_timer(struct ctx *c, const struct timespec *ts)
(void)ts;
if (c->mode == MODE_PASTA) {
- struct tcp_port_detect_arg detect_arg = { c, 0 };
struct tcp_port_rebind_arg rebind_arg = { c, 0 };
if (c->tcp.fwd_out.mode == FWD_AUTO) {
- detect_arg.detect_in_ns = 0;
- tcp_port_detect(&detect_arg);
+ get_bound_ports(c, 0, IPPROTO_TCP);
rebind_arg.bind_in_ns = 1;
NS_CALL(tcp_port_rebind, &rebind_arg);
}
if (c->tcp.fwd_in.mode == FWD_AUTO) {
- detect_arg.detect_in_ns = 1;
- NS_CALL(tcp_port_detect, &detect_arg);
+ get_bound_ports(c, 1, IPPROTO_TCP);
rebind_arg.bind_in_ns = 0;
tcp_port_rebind(&rebind_arg);
}
--
2.41.0