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selftests/bpf: Add checks in tc_tunnel when entering net namespaces

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test_tc_tunnel is missing checks on any open_netns. Add those checks
anytime we try to enter a net namespace, and skip the related operations
if we fail. While at it, reduce the number of open_netns/close_netns for
cases involving operations in two distinct namespaces: the test
currently does the following:

  nstoken = open_netns("foo")
  do_operation();
  close(nstoken);
  nstoken = open_netns("bar")
  do_another_operation();
  close(nstoken);

As already stated in reviews for the initial test, we don't need to go
back to the root net namespace to enter a second namespace, so just do:

  ntoken_client = open_netns("foo")
  do_operation();
  nstoken_server = open_netns("bar")
  do_another_operation();
  close(nstoken_server);
  close(nstoken_client);

Signed-off-by: Alexis Lothoré (eBPF Foundation) <alexis.lothore@bootlin.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://patch.msgid.link/20251031-tc_tunnel_improv-v1-2-0ffe44d27eda@bootlin.com
This commit is contained in:
Alexis Lothoré (eBPF Foundation)
2025-10-31 10:01:42 +01:00
committed by Martin KaFai Lau
parent c076fd5bb4
commit e6e10c51fb
1 changed files with 85 additions and 43 deletions
Download Patch File Download Diff File Expand all files Collapse all files

128
tools/testing/selftests/bpf/prog_tests/test_tc_tunnel.c
View File

@@ -133,8 +133,12 @@ static void set_subtest_addresses(struct subtest_cfg *cfg)
static int run_server(struct subtest_cfg *cfg)
{
struct nstoken *nstoken = open_netns(SERVER_NS);
int family = cfg->ipproto == 6 ? AF_INET6 : AF_INET;
struct nstoken *nstoken;
nstoken = open_netns(SERVER_NS);
if (!ASSERT_OK_PTR(nstoken, "open server ns"))
return -1;
cfg->server_fd = start_reuseport_server(family, SOCK_STREAM,
cfg->server_addr, TEST_PORT,
@@ -319,6 +323,10 @@ static int configure_encapsulation(struct subtest_cfg *cfg)
static int configure_kernel_decapsulation(struct subtest_cfg *cfg)
{
struct nstoken *nstoken = open_netns(SERVER_NS);
int ret = -1;
if (!ASSERT_OK_PTR(nstoken, "open server ns"))
return ret;
if (cfg->configure_fou_rx_port &&
!ASSERT_OK(add_fou_rx_port(cfg), "configure FOU RX port"))
@@ -337,11 +345,11 @@ static int configure_kernel_decapsulation(struct subtest_cfg *cfg)
SYS(fail, "sysctl -qw net.ipv4.conf.all.rp_filter=0");
SYS(fail, "sysctl -qw net.ipv4.conf.testtun0.rp_filter=0");
SYS(fail, "ip link set dev testtun0 up");
close_netns(nstoken);
return 0;
ret = 0;
fail:
close_netns(nstoken);
return -1;
return ret;
}
static void remove_kernel_decapsulation(struct subtest_cfg *cfg)
@@ -356,6 +364,10 @@ static void remove_kernel_decapsulation(struct subtest_cfg *cfg)
static int configure_ebpf_decapsulation(struct subtest_cfg *cfg)
{
struct nstoken *nstoken = open_netns(SERVER_NS);
int ret = -1;
if (!ASSERT_OK_PTR(nstoken, "open server ns"))
return ret;
if (!cfg->expect_kern_decap_failure)
SYS(fail, "ip link del testtun0");
@@ -363,17 +375,20 @@ static int configure_ebpf_decapsulation(struct subtest_cfg *cfg)
if (!ASSERT_OK(tc_prog_attach("veth2", cfg->server_ingress_prog_fd, -1),
"attach_program"))
goto fail;
close_netns(nstoken);
return 0;
ret = 0;
fail:
close_netns(nstoken);
return -1;
return ret;
}
static void run_test(struct subtest_cfg *cfg)
{
struct nstoken *nstoken = open_netns(CLIENT_NS);
if (!ASSERT_OK_PTR(nstoken, "open client ns"))
return;
if (!ASSERT_OK(run_server(cfg), "run server"))
goto fail;
@@ -407,7 +422,7 @@ fail:
static int setup(void)
{
struct nstoken *nstoken = NULL;
struct nstoken *nstoken_client, *nstoken_server;
int fd, err;
fd = open("/dev/urandom", O_RDONLY);
@@ -424,52 +439,75 @@ static int setup(void)
!ASSERT_OK(make_netns(SERVER_NS), "create server ns"))
goto fail;
nstoken = open_netns(CLIENT_NS);
SYS(fail, "ip link add %s type veth peer name %s",
nstoken_client = open_netns(CLIENT_NS);
if (!ASSERT_OK_PTR(nstoken_client, "open client ns"))
goto fail_delete_ns;
SYS(fail_close_ns_client, "ip link add %s type veth peer name %s",
"veth1 mtu 1500 netns " CLIENT_NS " address " MAC_ADDR_VETH1,
"veth2 mtu 1500 netns " SERVER_NS " address " MAC_ADDR_VETH2);
SYS(fail, "ethtool -K veth1 tso off");
SYS(fail, "ip link set veth1 up");
close_netns(nstoken);
nstoken = open_netns(SERVER_NS);
SYS(fail, "ip link set veth2 up");
close_netns(nstoken);
SYS(fail_close_ns_client, "ethtool -K veth1 tso off");
SYS(fail_close_ns_client, "ip link set veth1 up");
nstoken_server = open_netns(SERVER_NS);
if (!ASSERT_OK_PTR(nstoken_server, "open server ns"))
goto fail_close_ns_client;
SYS(fail_close_ns_server, "ip link set veth2 up");
close_netns(nstoken_server);
close_netns(nstoken_client);
return 0;
fail_close_ns_server:
close_netns(nstoken_server);
fail_close_ns_client:
close_netns(nstoken_client);
fail_delete_ns:
SYS_NOFAIL("ip netns del " CLIENT_NS);
SYS_NOFAIL("ip netns del " SERVER_NS);
fail:
close_netns(nstoken);
return 1;
return -1;
}
static int subtest_setup(struct test_tc_tunnel *skel, struct subtest_cfg *cfg)
{
struct nstoken *nstoken;
struct nstoken *nstoken_client, *nstoken_server;
int ret = -1;
set_subtest_addresses(cfg);
if (!ASSERT_OK(set_subtest_progs(cfg, skel),
"find subtest progs"))
return -1;
goto fail;
if (cfg->extra_decap_mod_args_cb)
cfg->extra_decap_mod_args_cb(cfg, cfg->extra_decap_mod_args);
nstoken = open_netns(CLIENT_NS);
SYS(fail, "ip -4 addr add " IP4_ADDR_VETH1 "/24 dev veth1");
SYS(fail, "ip -4 route flush table main");
SYS(fail, "ip -4 route add " IP4_ADDR_VETH2 " mtu 1450 dev veth1");
SYS(fail, "ip -6 addr add " IP6_ADDR_VETH1 "/64 dev veth1 nodad");
SYS(fail, "ip -6 route flush table main");
SYS(fail, "ip -6 route add " IP6_ADDR_VETH2 " mtu 1430 dev veth1");
close_netns(nstoken);
nstoken_client = open_netns(CLIENT_NS);
if (!ASSERT_OK_PTR(nstoken_client, "open client ns"))
goto fail;
SYS(fail_close_client_ns,
"ip -4 addr add " IP4_ADDR_VETH1 "/24 dev veth1");
SYS(fail_close_client_ns, "ip -4 route flush table main");
SYS(fail_close_client_ns,
"ip -4 route add " IP4_ADDR_VETH2 " mtu 1450 dev veth1");
SYS(fail_close_client_ns,
"ip -6 addr add " IP6_ADDR_VETH1 "/64 dev veth1 nodad");
SYS(fail_close_client_ns, "ip -6 route flush table main");
SYS(fail_close_client_ns,
"ip -6 route add " IP6_ADDR_VETH2 " mtu 1430 dev veth1");
nstoken_server = open_netns(SERVER_NS);
if (!ASSERT_OK_PTR(nstoken_server, "open server ns"))
goto fail_close_client_ns;
SYS(fail_close_server_ns,
"ip -4 addr add " IP4_ADDR_VETH2 "/24 dev veth2");
SYS(fail_close_server_ns,
"ip -6 addr add " IP6_ADDR_VETH2 "/64 dev veth2 nodad");
nstoken = open_netns(SERVER_NS);
SYS(fail, "ip -4 addr add " IP4_ADDR_VETH2 "/24 dev veth2");
SYS(fail, "ip -6 addr add " IP6_ADDR_VETH2 "/64 dev veth2 nodad");
close_netns(nstoken);
ret = 0;
return 0;
fail_close_server_ns:
close_netns(nstoken_server);
fail_close_client_ns:
close_netns(nstoken_client);
fail:
close_netns(nstoken);
return -1;
return ret;
}
@@ -478,15 +516,19 @@ static void subtest_cleanup(struct subtest_cfg *cfg)
struct nstoken *nstoken;
nstoken = open_netns(CLIENT_NS);
SYS_NOFAIL("tc qdisc delete dev veth1 parent ffff:fff1");
SYS_NOFAIL("ip a flush veth1");
close_netns(nstoken);
if (ASSERT_OK_PTR(nstoken, "open clien ns")) {
SYS_NOFAIL("tc qdisc delete dev veth1 parent ffff:fff1");
SYS_NOFAIL("ip a flush veth1");
close_netns(nstoken);
}
nstoken = open_netns(SERVER_NS);
SYS_NOFAIL("tc qdisc delete dev veth2 parent ffff:fff1");
SYS_NOFAIL("ip a flush veth2");
if (!cfg->expect_kern_decap_failure)
remove_kernel_decapsulation(cfg);
close_netns(nstoken);
if (ASSERT_OK_PTR(nstoken, "open clien ns")) {
SYS_NOFAIL("tc qdisc delete dev veth2 parent ffff:fff1");
SYS_NOFAIL("ip a flush veth2");
if (!cfg->expect_kern_decap_failure)
remove_kernel_decapsulation(cfg);
close_netns(nstoken);
}
}
static void cleanup(void)