qa: build unshared nfct environment

nssocket forks and change netns pre-establishd by ip(8), serves its
socket descriptor to parent via nssocket().  Since this socket is
isolated, it can be used to create regression tests for conntrack.

This also adds a conntrack event testcase as a first user.
A ct_echo_event.sh script is provided to build and run this test
automatically:

  # ./qa/ct_echo_event.sh
  make: Entering directory...
  ...debug output like:
      [NEW] tcp      6 2 SYN_SENT src=10.255.255.249 dst=10.255.255.250 sport...
   [UPDATE] tcp      6 2 SYN_RECV src=10.255.255.249 dst=10.255.255.250 sport...
  ...
  [DESTROY] icmp     1 src=10.255.255.249 dst=10.255.255.250 type=8 code=0...
  # echo $?
  0

Signed-off-by: Ken-ichirou MATSUZAWA <chamas@h4.dion.ne.jp>
Signed-off-by: Florian Westphal <fw@strlen.de>

1 files changed, 62 insertions, 0 deletions

diff --git a/qa/ct_echo_event.c b/qa/ct_echo_event.c
new file mode 100644
index 0000000..6874395
--- /dev/null
+++ b/qa/ct_echo_event.c
@@ -0,0 +1,62 @@
+#include <assert.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <netinet/in.h>
+
+#include <libmnl/libmnl.h>
+
+#include "nssocket.h"
+
+static void udp_echo(const struct mnl_socket *nl,
+		     const char *pre, const char *post)
+{
+	u_int8_t proto = IPPROTO_UDP;
+
+	sync_fifo(pre);
+	timeout.tv_sec = INIT_TIMEOUT;
+	handle_qacb(nl, true, cb_udp_new, &proto);
+	handle_qacb(nl, true, cb_udp_update, &proto);
+	handle_qacb(nl, true, cb_udp_destroy, &proto);
+	handle_qacb(nl, false, NULL, NULL);
+	sync_fifo(post);
+}
+
+static void icmp_echo(const struct mnl_socket *nl,
+		      const char *pre, const char *post)
+{
+	u_int8_t proto = IPPROTO_ICMP;
+
+	sync_fifo(pre);
+	timeout.tv_sec = INIT_TIMEOUT;
+	handle_qacb(nl, true, cb_icmp_new, &proto);
+	handle_qacb(nl, true, cb_icmp_update, &proto);
+	handle_qacb(nl, true, cb_icmp_destroy, &proto);
+	handle_qacb(nl, false, NULL, NULL);
+	sync_fifo(post);
+}
+
+int main(int argc, char *argv[])
+{
+	struct mnl_socket *nl;
+	char *pre, *post;
+
+	if (argc != 4) {
+		fprintf(stderr, "usage: %s <netns> <pre_fifo> <post_fifo>\n", argv[0]);
+		exit(EXIT_FAILURE);
+	}
+	pre = argv[2];
+	post = argv[3];
+
+	nl = mnl_event_nssocket(argv[1]);
+	if (nl == NULL) {
+		perror("init_mnl_socket");
+		exit(EXIT_FAILURE);
+	}
+
+	tcp_echo(nl, pre, post);
+	udp_echo(nl, pre, post);
+	icmp_echo(nl, pre, post);
+
+	return fini_nssocket();
+}