Merge tag 'net-6.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

Pull networking fixes from Jakub Kicinski:
 "Including fixes from bluetooth, bpf, can and netfilter.

  A little larger than usual but it's all fixes, no late features. It's
  large partially because of timing, and partially because of follow ups
  to stuff that got merged a week or so before the merge window and
  wasn't as widely tested. Maybe the Bluetooth fixes are a little
  alarming so we'll address that, but the rest seems okay and not scary.

  Notably we're including a fix for the netfilter Kconfig [1], your WiFi
  warning [2] and a bluetooth fix which should unblock syzbot [3].

  Current release - regressions:

   - Bluetooth:
      - don't try to cancel uninitialized works [3]
      - L2CAP: fix use-after-free caused by l2cap_chan_put

   - tls: rx: fix device offload after recent rework

   - devlink: fix UAF on failed reload and leftover locks in mlxsw

  Current release - new code bugs:

   - netfilter:
      - flowtable: fix incorrect Kconfig dependencies [1]
      - nf_tables: fix crash when nf_trace is enabled

   - bpf:
      - use proper target btf when exporting attach_btf_obj_id
      - arm64: fixes for bpf trampoline support

   - Bluetooth:
      - ISO: unlock on error path in iso_sock_setsockopt()
      - ISO: fix info leak in iso_sock_getsockopt()
      - ISO: fix iso_sock_getsockopt for BT_DEFER_SETUP
      - ISO: fix memory corruption on iso_pinfo.base
      - ISO: fix not using the correct QoS
      - hci_conn: fix updating ISO QoS PHY

   - phy: dp83867: fix get nvmem cell fail

  Previous releases - regressions:

   - wifi: cfg80211: fix validating BSS pointers in
     __cfg80211_connect_result [2]

   - atm: bring back zatm uAPI after ATM had been removed

   - properly fix old bug making bonding ARP monitor mode not being able
     to work with software devices with lockless Tx

   - tap: fix null-deref on skb->dev in dev_parse_header_protocol

   - revert "net: usb: ax88179_178a needs FLAG_SEND_ZLP" it helps some
     devices and breaks others

   - netfilter:
      - nf_tables: many fixes rejecting cross-object linking which may
        lead to UAFs
      - nf_tables: fix null deref due to zeroed list head
      - nf_tables: validate variable length element extension

   - bgmac: fix a BUG triggered by wrong bytes_compl

   - bcmgenet: indicate MAC is in charge of PHY PM

  Previous releases - always broken:

   - bpf:
      - fix bad pointer deref in bpf_sys_bpf() injected via test infra
      - disallow non-builtin bpf programs calling the prog_run command
      - don't reinit map value in prealloc_lru_pop
      - fix UAFs during the read of map iterator fd
      - fix invalidity check for values in sk local storage map
      - reject sleepable program for non-resched map iterator

   - mptcp:
      - move subflow cleanup in mptcp_destroy_common()
      - do not queue data on closed subflows

   - virtio_net: fix memory leak inside XDP_TX with mergeable

   - vsock: fix memory leak when multiple threads try to connect()

   - rework sk_user_data sharing to prevent psock leaks

   - geneve: fix TOS inheriting for ipv4

   - tunnels & drivers: do not use RT_TOS for IPv6 flowlabel

   - phy: c45 baset1: do not skip aneg configuration if clock role is
     not specified

   - rose: avoid overflow when /proc displays timer information

   - x25: fix call timeouts in blocking connects

   - can: mcp251x: fix race condition on receive interrupt

   - can: j1939:
      - replace user-reachable WARN_ON_ONCE() with netdev_warn_once()
      - fix memory leak of skbs in j1939_session_destroy()

  Misc:

   - docs: bpf: clarify that many things are not uAPI

   - seg6: initialize induction variable to first valid array index (to
     silence clang vs objtool warning)

   - can: ems_usb: fix clang 14's -Wunaligned-access warning"

* tag 'net-6.0-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (117 commits)
  net: atm: bring back zatm uAPI
  dpaa2-eth: trace the allocated address instead of page struct
  net: add missing kdoc for struct genl_multicast_group::flags
  nfp: fix use-after-free in area_cache_get()
  MAINTAINERS: use my korg address for mt7601u
  mlxsw: minimal: Fix deadlock in ports creation
  bonding: fix reference count leak in balance-alb mode
  net: usb: qmi_wwan: Add support for Cinterion MV32
  bpf: Shut up kern_sys_bpf warning.
  net/tls: Use RCU API to access tls_ctx->netdev
  tls: rx: device: don't try to copy too much on detach
  tls: rx: device: bound the frag walk
  net_sched: cls_route: remove from list when handle is 0
  selftests: forwarding: Fix failing tests with old libnet
  net: refactor bpf_sk_reuseport_detach()
  net: fix refcount bug in sk_psock_get (2)
  selftests/bpf: Ensure sleepable program is rejected by hash map iter
  selftests/bpf: Add write tests for sk local storage map iterator
  selftests/bpf: Add tests for reading a dangling map iter fd
  bpf: Only allow sleepable program for resched-able iterator
  ...

14 files changed, 887 insertions, 43 deletions

diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_iter.c b/tools/testing/selftests/bpf/prog_tests/bpf_iter.c
index a33874b081b6..e89685bd587c 100644
--- a/tools/testing/selftests/bpf/prog_tests/bpf_iter.c
+++ b/tools/testing/selftests/bpf/prog_tests/bpf_iter.c
@@ -28,6 +28,7 @@
 #include "bpf_iter_test_kern6.skel.h"
 #include "bpf_iter_bpf_link.skel.h"
 #include "bpf_iter_ksym.skel.h"
+#include "bpf_iter_sockmap.skel.h"
 
 static int duration;
 
@@ -67,6 +68,50 @@ free_link:
 	bpf_link__destroy(link);
 }
 
+static void do_read_map_iter_fd(struct bpf_object_skeleton **skel, struct bpf_program *prog,
+				struct bpf_map *map)
+{
+	DECLARE_LIBBPF_OPTS(bpf_iter_attach_opts, opts);
+	union bpf_iter_link_info linfo;
+	struct bpf_link *link;
+	char buf[16] = {};
+	int iter_fd, len;
+
+	memset(&linfo, 0, sizeof(linfo));
+	linfo.map.map_fd = bpf_map__fd(map);
+	opts.link_info = &linfo;
+	opts.link_info_len = sizeof(linfo);
+	link = bpf_program__attach_iter(prog, &opts);
+	if (!ASSERT_OK_PTR(link, "attach_map_iter"))
+		return;
+
+	iter_fd = bpf_iter_create(bpf_link__fd(link));
+	if (!ASSERT_GE(iter_fd, 0, "create_map_iter")) {
+		bpf_link__destroy(link);
+		return;
+	}
+
+	/* Close link and map fd prematurely */
+	bpf_link__destroy(link);
+	bpf_object__destroy_skeleton(*skel);
+	*skel = NULL;
+
+	/* Try to let map free work to run first if map is freed */
+	usleep(100);
+	/* Memory used by both sock map and sock local storage map are
+	 * freed after two synchronize_rcu() calls, so wait for it
+	 */
+	kern_sync_rcu();
+	kern_sync_rcu();
+
+	/* Read after both map fd and link fd are closed */
+	while ((len = read(iter_fd, buf, sizeof(buf))) > 0)
+		;
+	ASSERT_GE(len, 0, "read_iterator");
+
+	close(iter_fd);
+}
+
 static int read_fd_into_buffer(int fd, char *buf, int size)
 {
 	int bufleft = size;
@@ -634,6 +679,12 @@ static void test_bpf_hash_map(void)
 			goto out;
 	}
 
+	/* Sleepable program is prohibited for hash map iterator */
+	linfo.map.map_fd = map_fd;
+	link = bpf_program__attach_iter(skel->progs.sleepable_dummy_dump, &opts);
+	if (!ASSERT_ERR_PTR(link, "attach_sleepable_prog_to_iter"))
+		goto out;
+
 	linfo.map.map_fd = map_fd;
 	link = bpf_program__attach_iter(skel->progs.dump_bpf_hash_map, &opts);
 	if (!ASSERT_OK_PTR(link, "attach_iter"))
@@ -827,6 +878,20 @@ out:
 	bpf_iter_bpf_array_map__destroy(skel);
 }
 
+static void test_bpf_array_map_iter_fd(void)
+{
+	struct bpf_iter_bpf_array_map *skel;
+
+	skel = bpf_iter_bpf_array_map__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "bpf_iter_bpf_array_map__open_and_load"))
+		return;
+
+	do_read_map_iter_fd(&skel->skeleton, skel->progs.dump_bpf_array_map,
+			    skel->maps.arraymap1);
+
+	bpf_iter_bpf_array_map__destroy(skel);
+}
+
 static void test_bpf_percpu_array_map(void)
 {
 	DECLARE_LIBBPF_OPTS(bpf_iter_attach_opts, opts);
@@ -1009,6 +1074,20 @@ out:
 	bpf_iter_bpf_sk_storage_helpers__destroy(skel);
 }
 
+static void test_bpf_sk_stoarge_map_iter_fd(void)
+{
+	struct bpf_iter_bpf_sk_storage_map *skel;
+
+	skel = bpf_iter_bpf_sk_storage_map__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "bpf_iter_bpf_sk_storage_map__open_and_load"))
+		return;
+
+	do_read_map_iter_fd(&skel->skeleton, skel->progs.rw_bpf_sk_storage_map,
+			    skel->maps.sk_stg_map);
+
+	bpf_iter_bpf_sk_storage_map__destroy(skel);
+}
+
 static void test_bpf_sk_storage_map(void)
 {
 	DECLARE_LIBBPF_OPTS(bpf_iter_attach_opts, opts);
@@ -1044,7 +1123,15 @@ static void test_bpf_sk_storage_map(void)
 	linfo.map.map_fd = map_fd;
 	opts.link_info = &linfo;
 	opts.link_info_len = sizeof(linfo);
-	link = bpf_program__attach_iter(skel->progs.dump_bpf_sk_storage_map, &opts);
+	link = bpf_program__attach_iter(skel->progs.oob_write_bpf_sk_storage_map, &opts);
+	err = libbpf_get_error(link);
+	if (!ASSERT_EQ(err, -EACCES, "attach_oob_write_iter")) {
+		if (!err)
+			bpf_link__destroy(link);
+		goto out;
+	}
+
+	link = bpf_program__attach_iter(skel->progs.rw_bpf_sk_storage_map, &opts);
 	if (!ASSERT_OK_PTR(link, "attach_iter"))
 		goto out;
 
@@ -1052,6 +1139,7 @@ static void test_bpf_sk_storage_map(void)
 	if (!ASSERT_GE(iter_fd, 0, "create_iter"))
 		goto free_link;
 
+	skel->bss->to_add_val = time(NULL);
 	/* do some tests */
 	while ((len = read(iter_fd, buf, sizeof(buf))) > 0)
 		;
@@ -1065,6 +1153,13 @@ static void test_bpf_sk_storage_map(void)
 	if (!ASSERT_EQ(skel->bss->val_sum, expected_val, "val_sum"))
 		goto close_iter;
 
+	for (i = 0; i < num_sockets; i++) {
+		err = bpf_map_lookup_elem(map_fd, &sock_fd[i], &val);
+		if (!ASSERT_OK(err, "map_lookup") ||
+		    !ASSERT_EQ(val, i + 1 + skel->bss->to_add_val, "check_map_value"))
+			break;
+	}
+
 close_iter:
 	close(iter_fd);
 free_link:
@@ -1217,6 +1312,19 @@ out:
 	bpf_iter_task_vma__destroy(skel);
 }
 
+void test_bpf_sockmap_map_iter_fd(void)
+{
+	struct bpf_iter_sockmap *skel;
+
+	skel = bpf_iter_sockmap__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "bpf_iter_sockmap__open_and_load"))
+		return;
+
+	do_read_map_iter_fd(&skel->skeleton, skel->progs.copy, skel->maps.sockmap);
+
+	bpf_iter_sockmap__destroy(skel);
+}
+
 void test_bpf_iter(void)
 {
 	if (test__start_subtest("btf_id_or_null"))
@@ -1267,10 +1375,14 @@ void test_bpf_iter(void)
 		test_bpf_percpu_hash_map();
 	if (test__start_subtest("bpf_array_map"))
 		test_bpf_array_map();
+	if (test__start_subtest("bpf_array_map_iter_fd"))
+		test_bpf_array_map_iter_fd();
 	if (test__start_subtest("bpf_percpu_array_map"))
 		test_bpf_percpu_array_map();
 	if (test__start_subtest("bpf_sk_storage_map"))
 		test_bpf_sk_storage_map();
+	if (test__start_subtest("bpf_sk_storage_map_iter_fd"))
+		test_bpf_sk_stoarge_map_iter_fd();
 	if (test__start_subtest("bpf_sk_storage_delete"))
 		test_bpf_sk_storage_delete();
 	if (test__start_subtest("bpf_sk_storage_get"))
@@ -1283,4 +1395,6 @@ void test_bpf_iter(void)
 		test_link_iter();
 	if (test__start_subtest("ksym"))
 		test_ksym_iter();
+	if (test__start_subtest("bpf_sockmap_map_iter_fd"))
+		test_bpf_sockmap_map_iter_fd();
 }
diff --git a/tools/testing/selftests/bpf/prog_tests/fexit_bpf2bpf.c b/tools/testing/selftests/bpf/prog_tests/fexit_bpf2bpf.c
index 02bb8cbf9194..da860b07abb5 100644
--- a/tools/testing/selftests/bpf/prog_tests/fexit_bpf2bpf.c
+++ b/tools/testing/selftests/bpf/prog_tests/fexit_bpf2bpf.c
@@ -3,6 +3,7 @@
 #include <test_progs.h>
 #include <network_helpers.h>
 #include <bpf/btf.h>
+#include "bind4_prog.skel.h"
 
 typedef int (*test_cb)(struct bpf_object *obj);
 
@@ -407,6 +408,98 @@ static void test_func_replace_global_func(void)
 				  prog_name, false, NULL);
 }
 
+static int find_prog_btf_id(const char *name, __u32 attach_prog_fd)
+{
+	struct bpf_prog_info info = {};
+	__u32 info_len = sizeof(info);
+	struct btf *btf;
+	int ret;
+
+	ret = bpf_obj_get_info_by_fd(attach_prog_fd, &info, &info_len);
+	if (ret)
+		return ret;
+
+	if (!info.btf_id)
+		return -EINVAL;
+
+	btf = btf__load_from_kernel_by_id(info.btf_id);
+	ret = libbpf_get_error(btf);
+	if (ret)
+		return ret;
+
+	ret = btf__find_by_name_kind(btf, name, BTF_KIND_FUNC);
+	btf__free(btf);
+	return ret;
+}
+
+static int load_fentry(int attach_prog_fd, int attach_btf_id)
+{
+	LIBBPF_OPTS(bpf_prog_load_opts, opts,
+		    .expected_attach_type = BPF_TRACE_FENTRY,
+		    .attach_prog_fd = attach_prog_fd,
+		    .attach_btf_id = attach_btf_id,
+	);
+	struct bpf_insn insns[] = {
+		BPF_MOV64_IMM(BPF_REG_0, 0),
+		BPF_EXIT_INSN(),
+	};
+
+	return bpf_prog_load(BPF_PROG_TYPE_TRACING,
+			     "bind4_fentry",
+			     "GPL",
+			     insns,
+			     ARRAY_SIZE(insns),
+			     &opts);
+}
+
+static void test_fentry_to_cgroup_bpf(void)
+{
+	struct bind4_prog *skel = NULL;
+	struct bpf_prog_info info = {};
+	__u32 info_len = sizeof(info);
+	int cgroup_fd = -1;
+	int fentry_fd = -1;
+	int btf_id;
+
+	cgroup_fd = test__join_cgroup("/fentry_to_cgroup_bpf");
+	if (!ASSERT_GE(cgroup_fd, 0, "cgroup_fd"))
+		return;
+
+	skel = bind4_prog__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "skel"))
+		goto cleanup;
+
+	skel->links.bind_v4_prog = bpf_program__attach_cgroup(skel->progs.bind_v4_prog, cgroup_fd);
+	if (!ASSERT_OK_PTR(skel->links.bind_v4_prog, "bpf_program__attach_cgroup"))
+		goto cleanup;
+
+	btf_id = find_prog_btf_id("bind_v4_prog", bpf_program__fd(skel->progs.bind_v4_prog));
+	if (!ASSERT_GE(btf_id, 0, "find_prog_btf_id"))
+		goto cleanup;
+
+	fentry_fd = load_fentry(bpf_program__fd(skel->progs.bind_v4_prog), btf_id);
+	if (!ASSERT_GE(fentry_fd, 0, "load_fentry"))
+		goto cleanup;
+
+	/* Make sure bpf_obj_get_info_by_fd works correctly when attaching
+	 * to another BPF program.
+	 */
+
+	ASSERT_OK(bpf_obj_get_info_by_fd(fentry_fd, &info, &info_len),
+		  "bpf_obj_get_info_by_fd");
+
+	ASSERT_EQ(info.btf_id, 0, "info.btf_id");
+	ASSERT_EQ(info.attach_btf_id, btf_id, "info.attach_btf_id");
+	ASSERT_GT(info.attach_btf_obj_id, 0, "info.attach_btf_obj_id");
+
+cleanup:
+	if (cgroup_fd >= 0)
+		close(cgroup_fd);
+	if (fentry_fd >= 0)
+		close(fentry_fd);
+	bind4_prog__destroy(skel);
+}
+
 /* NOTE: affect other tests, must run in serial mode */
 void serial_test_fexit_bpf2bpf(void)
 {
@@ -430,4 +523,6 @@ void serial_test_fexit_bpf2bpf(void)
 		test_fmod_ret_freplace();
 	if (test__start_subtest("func_replace_global_func"))
 		test_func_replace_global_func();
+	if (test__start_subtest("fentry_to_cgroup_bpf"))
+		test_fentry_to_cgroup_bpf();
 }
diff --git a/tools/testing/selftests/bpf/prog_tests/lru_bug.c b/tools/testing/selftests/bpf/prog_tests/lru_bug.c
new file mode 100644
index 000000000000..3c7822390827
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/lru_bug.c
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <test_progs.h>
+
+#include "lru_bug.skel.h"
+
+void test_lru_bug(void)
+{
+	struct lru_bug *skel;
+	int ret;
+
+	skel = lru_bug__open_and_load();
+	if (!ASSERT_OK_PTR(skel, "lru_bug__open_and_load"))
+		return;
+	ret = lru_bug__attach(skel);
+	if (!ASSERT_OK(ret, "lru_bug__attach"))
+		goto end;
+	usleep(1);
+	ASSERT_OK(skel->data->result, "prealloc_lru_pop doesn't call check_and_init_map_value");
+end:
+	lru_bug__destroy(skel);
+}
diff --git a/tools/testing/selftests/bpf/progs/bpf_iter_bpf_hash_map.c b/tools/testing/selftests/bpf/progs/bpf_iter_bpf_hash_map.c
index 0aa3cd34cbe3..d7a69217fb68 100644
--- a/tools/testing/selftests/bpf/progs/bpf_iter_bpf_hash_map.c
+++ b/tools/testing/selftests/bpf/progs/bpf_iter_bpf_hash_map.c
@@ -112,3 +112,12 @@ int dump_bpf_hash_map(struct bpf_iter__bpf_map_elem *ctx)
 
 	return 0;
 }
+
+SEC("iter.s/bpf_map_elem")
+int sleepable_dummy_dump(struct bpf_iter__bpf_map_elem *ctx)
+{
+	if (ctx->meta->seq_num == 0)
+		BPF_SEQ_PRINTF(ctx->meta->seq, "map dump starts\n");
+
+	return 0;
+}
diff --git a/tools/testing/selftests/bpf/progs/bpf_iter_bpf_sk_storage_map.c b/tools/testing/selftests/bpf/progs/bpf_iter_bpf_sk_storage_map.c
index 6b70ccaba301..c7b8e006b171 100644
--- a/tools/testing/selftests/bpf/progs/bpf_iter_bpf_sk_storage_map.c
+++ b/tools/testing/selftests/bpf/progs/bpf_iter_bpf_sk_storage_map.c
@@ -16,19 +16,37 @@ struct {
 
 __u32 val_sum = 0;
 __u32 ipv6_sk_count = 0;
+__u32 to_add_val = 0;
 
 SEC("iter/bpf_sk_storage_map")
-int dump_bpf_sk_storage_map(struct bpf_iter__bpf_sk_storage_map *ctx)
+int rw_bpf_sk_storage_map(struct bpf_iter__bpf_sk_storage_map *ctx)
 {
 	struct sock *sk = ctx->sk;
 	__u32 *val = ctx->value;
 
-	if (sk == (void *)0 || val == (void *)0)
+	if (sk == NULL || val == NULL)
 		return 0;
 
 	if (sk->sk_family == AF_INET6)
 		ipv6_sk_count++;
 
 	val_sum += *val;
+
+	*val += to_add_val;
+
+	return 0;
+}
+
+SEC("iter/bpf_sk_storage_map")
+int oob_write_bpf_sk_storage_map(struct bpf_iter__bpf_sk_storage_map *ctx)
+{
+	struct sock *sk = ctx->sk;
+	__u32 *val = ctx->value;
+
+	if (sk == NULL || val == NULL)
+		return 0;
+
+	*(val + 1) = 0xdeadbeef;
+
 	return 0;
 }
diff --git a/tools/testing/selftests/bpf/progs/lru_bug.c b/tools/testing/selftests/bpf/progs/lru_bug.c
new file mode 100644
index 000000000000..687081a724b3
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/lru_bug.c
@@ -0,0 +1,49 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <vmlinux.h>
+#include <bpf/bpf_tracing.h>
+#include <bpf/bpf_helpers.h>
+
+struct map_value {
+	struct task_struct __kptr *ptr;
+};
+
+struct {
+	__uint(type, BPF_MAP_TYPE_LRU_HASH);
+	__uint(max_entries, 1);
+	__type(key, int);
+	__type(value, struct map_value);
+} lru_map SEC(".maps");
+
+int pid = 0;
+int result = 1;
+
+SEC("fentry/bpf_ktime_get_ns")
+int printk(void *ctx)
+{
+	struct map_value v = {};
+
+	if (pid == bpf_get_current_task_btf()->pid)
+		bpf_map_update_elem(&lru_map, &(int){0}, &v, 0);
+	return 0;
+}
+
+SEC("fentry/do_nanosleep")
+int nanosleep(void *ctx)
+{
+	struct map_value val = {}, *v;
+	struct task_struct *current;
+
+	bpf_map_update_elem(&lru_map, &(int){0}, &val, 0);
+	v = bpf_map_lookup_elem(&lru_map, &(int){0});
+	if (!v)
+		return 0;
+	bpf_map_delete_elem(&lru_map, &(int){0});
+	current = bpf_get_current_task_btf();
+	v->ptr = current;
+	pid = current->pid;
+	bpf_ktime_get_ns();
+	result = !v->ptr;
+	return 0;
+}
+
+char _license[] SEC("license") = "GPL";
diff --git a/tools/testing/selftests/net/.gitignore b/tools/testing/selftests/net/.gitignore
index 892306bdb47d..0e5751af6247 100644
--- a/tools/testing/selftests/net/.gitignore
+++ b/tools/testing/selftests/net/.gitignore
@@ -38,4 +38,5 @@ ioam6_parser
 toeplitz
 tun
 cmsg_sender
-unix_connect
\ No newline at end of file
+unix_connect
+tap
\ No newline at end of file
diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile
index e2dfef8b78a7..c0ee2955fe54 100644
--- a/tools/testing/selftests/net/Makefile
+++ b/tools/testing/selftests/net/Makefile
@@ -57,7 +57,7 @@ TEST_GEN_FILES += ipsec
 TEST_GEN_FILES += ioam6_parser
 TEST_GEN_FILES += gro
 TEST_GEN_PROGS = reuseport_bpf reuseport_bpf_cpu reuseport_bpf_numa
-TEST_GEN_PROGS += reuseport_dualstack reuseaddr_conflict tls tun
+TEST_GEN_PROGS += reuseport_dualstack reuseaddr_conflict tls tun tap
 TEST_GEN_FILES += toeplitz
 TEST_GEN_FILES += cmsg_sender
 TEST_GEN_FILES += stress_reuseport_listen
diff --git a/tools/testing/selftests/net/forwarding/custom_multipath_hash.sh b/tools/testing/selftests/net/forwarding/custom_multipath_hash.sh
index a15d21dc035a..56eb83d1a3bd 100755
--- a/tools/testing/selftests/net/forwarding/custom_multipath_hash.sh
+++ b/tools/testing/selftests/net/forwarding/custom_multipath_hash.sh
@@ -181,37 +181,43 @@ ping_ipv6()
 
 send_src_ipv4()
 {
-	$MZ $h1 -q -p 64 -A "198.51.100.2-198.51.100.253" -B 203.0.113.2 \
+	ip vrf exec v$h1 $MZ $h1 -q -p 64 \
+		-A "198.51.100.2-198.51.100.253" -B 203.0.113.2 \
 		-d 1msec -c 50 -t udp "sp=20000,dp=30000"
 }
 
 send_dst_ipv4()
 {
-	$MZ $h1 -q -p 64 -A 198.51.100.2 -B "203.0.113.2-203.0.113.253" \
+	ip vrf exec v$h1 $MZ $h1 -q -p 64 \
+		-A 198.51.100.2 -B "203.0.113.2-203.0.113.253" \
 		-d 1msec -c 50 -t udp "sp=20000,dp=30000"
 }
 
 send_src_udp4()
 {
-	$MZ $h1 -q -p 64 -A 198.51.100.2 -B 203.0.113.2 \
+	ip vrf exec v$h1 $MZ $h1 -q -p 64 \
+		-A 198.51.100.2 -B 203.0.113.2 \
 		-d 1msec -t udp "sp=0-32768,dp=30000"
 }
 
 send_dst_udp4()
 {
-	$MZ $h1 -q -p 64 -A 198.51.100.2 -B 203.0.113.2 \
+	ip vrf exec v$h1 $MZ $h1 -q -p 64 \
+		-A 198.51.100.2 -B 203.0.113.2 \
 		-d 1msec -t udp "sp=20000,dp=0-32768"
 }
 
 send_src_ipv6()
 {
-	$MZ -6 $h1 -q -p 64 -A "2001:db8:1::2-2001:db8:1::fd" -B 2001:db8:4::2 \
+	ip vrf exec v$h1 $MZ -6 $h1 -q -p 64 \
+		-A "2001:db8:1::2-2001:db8:1::fd" -B 2001:db8:4::2 \
 		-d 1msec -c 50 -t udp "sp=20000,dp=30000"
 }
 
 send_dst_ipv6()
 {
-	$MZ -6 $h1 -q -p 64 -A 2001:db8:1::2 -B "2001:db8:4::2-2001:db8:4::fd" \
+	ip vrf exec v$h1 $MZ -6 $h1 -q -p 64 \
+		-A 2001:db8:1::2 -B "2001:db8:4::2-2001:db8:4::fd" \
 		-d 1msec -c 50 -t udp "sp=20000,dp=30000"
 }
 
@@ -226,13 +232,15 @@ send_flowlabel()
 
 send_src_udp6()
 {
-	$MZ -6 $h1 -q -p 64 -A 2001:db8:1::2 -B 2001:db8:4::2 \
+	ip vrf exec v$h1 $MZ -6 $h1 -q -p 64 \
+		-A 2001:db8:1::2 -B 2001:db8:4::2 \
 		-d 1msec -t udp "sp=0-32768,dp=30000"
 }
 
 send_dst_udp6()
 {
-	$MZ -6 $h1 -q -p 64 -A 2001:db8:1::2 -B 2001:db8:4::2 \
+	ip vrf exec v$h1 $MZ -6 $h1 -q -p 64 \
+		-A 2001:db8:1::2 -B 2001:db8:4::2 \
 		-d 1msec -t udp "sp=20000,dp=0-32768"
 }
 
diff --git a/tools/testing/selftests/net/forwarding/gre_custom_multipath_hash.sh b/tools/testing/selftests/net/forwarding/gre_custom_multipath_hash.sh
index a73f52efcb6c..0446db9c6f74 100755
--- a/tools/testing/selftests/net/forwarding/gre_custom_multipath_hash.sh
+++ b/tools/testing/selftests/net/forwarding/gre_custom_multipath_hash.sh
@@ -276,37 +276,43 @@ ping_ipv6()
 
 send_src_ipv4()
 {
-	$MZ $h1 -q -p 64 -A "198.51.100.2-198.51.100.253" -B 203.0.113.2 \
+	ip vrf exec v$h1 $MZ $h1 -q -p 64 \
+		-A "198.51.100.2-198.51.100.253" -B 203.0.113.2 \
 		-d 1msec -c 50 -t udp "sp=20000,dp=30000"
 }
 
 send_dst_ipv4()
 {
-	$MZ $h1 -q -p 64 -A 198.51.100.2 -B "203.0.113.2-203.0.113.253" \
+	ip vrf exec v$h1 $MZ $h1 -q -p 64 \
+		-A 198.51.100.2 -B "203.0.113.2-203.0.113.253" \
 		-d 1msec -c 50 -t udp "sp=20000,dp=30000"
 }
 
 send_src_udp4()
 {
-	$MZ $h1 -q -p 64 -A 198.51.100.2 -B 203.0.113.2 \
+	ip vrf exec v$h1 $MZ $h1 -q -p 64 \
+		-A 198.51.100.2 -B 203.0.113.2 \
 		-d 1msec -t udp "sp=0-32768,dp=30000"
 }
 
 send_dst_udp4()
 {
-	$MZ $h1 -q -p 64 -A 198.51.100.2 -B 203.0.113.2 \
+	ip vrf exec v$h1 $MZ $h1 -q -p 64 \
+		-A 198.51.100.2 -B 203.0.113.2 \
 		-d 1msec -t udp "sp=20000,dp=0-32768"
 }
 
 send_src_ipv6()
 {
-	$MZ -6 $h1 -q -p 64 -A "2001:db8:1::2-2001:db8:1::fd" -B 2001:db8:2::2 \
+	ip vrf exec v$h1 $MZ -6 $h1 -q -p 64 \
+		-A "2001:db8:1::2-2001:db8:1::fd" -B 2001:db8:2::2 \
 		-d 1msec -c 50 -t udp "sp=20000,dp=30000"
 }
 
 send_dst_ipv6()
 {
-	$MZ -6 $h1 -q -p 64 -A 2001:db8:1::2 -B "2001:db8:2::2-2001:db8:2::fd" \
+	ip vrf exec v$h1 $MZ -6 $h1 -q -p 64 \
+		-A 2001:db8:1::2 -B "2001:db8:2::2-2001:db8:2::fd" \
 		-d 1msec -c 50 -t udp "sp=20000,dp=30000"
 }
 
@@ -321,13 +327,15 @@ send_flowlabel()
 
 send_src_udp6()
 {
-	$MZ -6 $h1 -q -p 64 -A 2001:db8:1::2 -B 2001:db8:2::2 \
+	ip vrf exec v$h1 $MZ -6 $h1 -q -p 64 \
+		-A 2001:db8:1::2 -B 2001:db8:2::2 \
 		-d 1msec -t udp "sp=0-32768,dp=30000"
 }
 
 send_dst_udp6()
 {
-	$MZ -6 $h1 -q -p 64 -A 2001:db8:1::2 -B 2001:db8:2::2 \
+	ip vrf exec v$h1 $MZ -6 $h1 -q -p 64 \
+		-A 2001:db8:1::2 -B 2001:db8:2::2 \
 		-d 1msec -t udp "sp=20000,dp=0-32768"
 }
 
diff --git a/tools/testing/selftests/net/forwarding/ip6gre_custom_multipath_hash.sh b/tools/testing/selftests/net/forwarding/ip6gre_custom_multipath_hash.sh
index 8fea2c2e0b25..d40183b4eccc 100755
--- a/tools/testing/selftests/net/forwarding/ip6gre_custom_multipath_hash.sh
+++ b/tools/testing/selftests/net/forwarding/ip6gre_custom_multipath_hash.sh
@@ -278,37 +278,43 @@ ping_ipv6()
 
 send_src_ipv4()
 {
-	$MZ $h1 -q -p 64 -A "198.51.100.2-198.51.100.253" -B 203.0.113.2 \
+	ip vrf exec v$h1 $MZ $h1 -q -p 64 \
+		-A "198.51.100.2-198.51.100.253" -B 203.0.113.2 \
 		-d 1msec -c 50 -t udp "sp=20000,dp=30000"
 }
 
 send_dst_ipv4()
 {
-	$MZ $h1 -q -p 64 -A 198.51.100.2 -B "203.0.113.2-203.0.113.253" \
+	ip vrf exec v$h1 $MZ $h1 -q -p 64 \
+		-A 198.51.100.2 -B "203.0.113.2-203.0.113.253" \
 		-d 1msec -c 50 -t udp "sp=20000,dp=30000"
 }
 
 send_src_udp4()
 {
-	$MZ $h1 -q -p 64 -A 198.51.100.2 -B 203.0.113.2 \
+	ip vrf exec v$h1 $MZ $h1 -q -p 64 \
+		-A 198.51.100.2 -B 203.0.113.2 \
 		-d 1msec -t udp "sp=0-32768,dp=30000"
 }
 
 send_dst_udp4()
 {
-	$MZ $h1 -q -p 64 -A 198.51.100.2 -B 203.0.113.2 \
+	ip vrf exec v$h1 $MZ $h1 -q -p 64 \
+		-A 198.51.100.2 -B 203.0.113.2 \
 		-d 1msec -t udp "sp=20000,dp=0-32768"
 }
 
 send_src_ipv6()
 {
-	$MZ -6 $h1 -q -p 64 -A "2001:db8:1::2-2001:db8:1::fd" -B 2001:db8:2::2 \
+	ip vrf exec v$h1 $MZ -6 $h1 -q -p 64 \
+		-A "2001:db8:1::2-2001:db8:1::fd" -B 2001:db8:2::2 \
 		-d 1msec -c 50 -t udp "sp=20000,dp=30000"
 }
 
 send_dst_ipv6()
 {
-	$MZ -6 $h1 -q -p 64 -A 2001:db8:1::2 -B "2001:db8:2::2-2001:db8:2::fd" \
+	ip vrf exec v$h1 $MZ -6 $h1 -q -p 64 \
+		-A 2001:db8:1::2 -B "2001:db8:2::2-2001:db8:2::fd" \
 		-d 1msec -c 50 -t udp "sp=20000,dp=30000"
 }
 
@@ -323,13 +329,15 @@ send_flowlabel()
 
 send_src_udp6()
 {
-	$MZ -6 $h1 -q -p 64 -A 2001:db8:1::2 -B 2001:db8:2::2 \
+	ip vrf exec v$h1 $MZ -6 $h1 -q -p 64 \
+		-A 2001:db8:1::2 -B 2001:db8:2::2 \
 		-d 1msec -t udp "sp=0-32768,dp=30000"
 }
 
 send_dst_udp6()
 {
-	$MZ -6 $h1 -q -p 64 -A 2001:db8:1::2 -B 2001:db8:2::2 \
+	ip vrf exec v$h1 $MZ -6 $h1 -q -p 64 \
+		-A 2001:db8:1::2 -B 2001:db8:2::2 \
 		-d 1msec -t udp "sp=20000,dp=0-32768"
 }
 
diff --git a/tools/testing/selftests/net/mptcp/mptcp_connect.c b/tools/testing/selftests/net/mptcp/mptcp_connect.c
index e2ea6c126c99..24d4e9cb617e 100644
--- a/tools/testing/selftests/net/mptcp/mptcp_connect.c
+++ b/tools/testing/selftests/net/mptcp/mptcp_connect.c
@@ -553,6 +553,18 @@ static void set_nonblock(int fd, bool nonblock)
 		fcntl(fd, F_SETFL, flags & ~O_NONBLOCK);
 }
 
+static void shut_wr(int fd)
+{
+	/* Close our write side, ev. give some time
+	 * for address notification and/or checking
+	 * the current status
+	 */
+	if (cfg_wait)
+		usleep(cfg_wait);
+
+	shutdown(fd, SHUT_WR);
+}
+
 static int copyfd_io_poll(int infd, int peerfd, int outfd, bool *in_closed_after_out)
 {
 	struct pollfd fds = {
@@ -630,14 +642,7 @@ static int copyfd_io_poll(int infd, int peerfd, int outfd, bool *in_closed_after
 					/* ... and peer also closed already */
 					break;
 
-				/* ... but we still receive.
-				 * Close our write side, ev. give some time
-				 * for address notification and/or checking
-				 * the current status
-				 */
-				if (cfg_wait)
-					usleep(cfg_wait);
-				shutdown(peerfd, SHUT_WR);
+				shut_wr(peerfd);
 			} else {
 				if (errno == EINTR)
 					continue;
@@ -767,7 +772,7 @@ static int copyfd_io_mmap(int infd, int peerfd, int outfd,
 		if (err)
 			return err;
 
-		shutdown(peerfd, SHUT_WR);
+		shut_wr(peerfd);
 
 		err = do_recvfile(peerfd, outfd);
 		*in_closed_after_out = true;
@@ -791,6 +796,9 @@ static int copyfd_io_sendfile(int infd, int peerfd, int outfd,
 		err = do_sendfile(infd, peerfd, size);
 		if (err)
 			return err;
+
+		shut_wr(peerfd);
+
 		err = do_recvfile(peerfd, outfd);
 		*in_closed_after_out = true;
 	}
diff --git a/tools/testing/selftests/net/tap.c b/tools/testing/selftests/net/tap.c
new file mode 100644
index 000000000000..247c3b3ac1c9
--- /dev/null
+++ b/tools/testing/selftests/net/tap.c
@@ -0,0 +1,434 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#define _GNU_SOURCE
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <net/if.h>
+#include <linux/if_tun.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <linux/virtio_net.h>
+#include <netinet/ip.h>
+#include <netinet/udp.h>
+#include "../kselftest_harness.h"
+
+static const char param_dev_tap_name[] = "xmacvtap0";
+static const char param_dev_dummy_name[] = "xdummy0";
+static unsigned char param_hwaddr_src[] = { 0x00, 0xfe, 0x98, 0x14, 0x22, 0x42 };
+static unsigned char param_hwaddr_dest[] = {
+	0x00, 0xfe, 0x98, 0x94, 0xd2, 0x43
+};
+
+#define MAX_RTNL_PAYLOAD (2048)
+#define PKT_DATA 0xCB
+#define TEST_PACKET_SZ (sizeof(struct virtio_net_hdr) + ETH_HLEN + ETH_MAX_MTU)
+
+static struct rtattr *rtattr_add(struct nlmsghdr *nh, unsigned short type,
+				 unsigned short len)
+{
+	struct rtattr *rta =
+		(struct rtattr *)((uint8_t *)nh + RTA_ALIGN(nh->nlmsg_len));
+	rta->rta_type = type;
+	rta->rta_len = RTA_LENGTH(len);
+	nh->nlmsg_len = RTA_ALIGN(nh->nlmsg_len) + RTA_ALIGN(rta->rta_len);
+	return rta;
+}
+
+static struct rtattr *rtattr_begin(struct nlmsghdr *nh, unsigned short type)
+{
+	return rtattr_add(nh, type, 0);
+}
+
+static void rtattr_end(struct nlmsghdr *nh, struct rtattr *attr)
+{
+	uint8_t *end = (uint8_t *)nh + nh->nlmsg_len;
+
+	attr->rta_len = end - (uint8_t *)attr;
+}
+
+static struct rtattr *rtattr_add_str(struct nlmsghdr *nh, unsigned short type,
+				     const char *s)
+{
+	struct rtattr *rta = rtattr_add(nh, type, strlen(s));
+
+	memcpy(RTA_DATA(rta), s, strlen(s));
+	return rta;
+}
+
+static struct rtattr *rtattr_add_strsz(struct nlmsghdr *nh, unsigned short type,
+				       const char *s)
+{
+	struct rtattr *rta = rtattr_add(nh, type, strlen(s) + 1);
+
+	strcpy(RTA_DATA(rta), s);
+	return rta;
+}
+
+static struct rtattr *rtattr_add_any(struct nlmsghdr *nh, unsigned short type,
+				     const void *arr, size_t len)
+{
+	struct rtattr *rta = rtattr_add(nh, type, len);
+
+	memcpy(RTA_DATA(rta), arr, len);
+	return rta;
+}
+
+static int dev_create(const char *dev, const char *link_type,
+		      int (*fill_rtattr)(struct nlmsghdr *nh),
+		      int (*fill_info_data)(struct nlmsghdr *nh))
+{
+	struct {
+		struct nlmsghdr nh;
+		struct ifinfomsg info;
+		unsigned char data[MAX_RTNL_PAYLOAD];
+	} req;
+	struct rtattr *link_info, *info_data;
+	int ret, rtnl;
+
+	rtnl = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
+	if (rtnl < 0) {
+		fprintf(stderr, "%s: socket %s\n", __func__, strerror(errno));
+		return 1;
+	}
+
+	memset(&req, 0, sizeof(req));
+	req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.info));
+	req.nh.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE;
+	req.nh.nlmsg_type = RTM_NEWLINK;
+
+	req.info.ifi_family = AF_UNSPEC;
+	req.info.ifi_type = 1;
+	req.info.ifi_index = 0;
+	req.info.ifi_flags = IFF_BROADCAST | IFF_UP;
+	req.info.ifi_change = 0xffffffff;
+
+	rtattr_add_str(&req.nh, IFLA_IFNAME, dev);
+
+	if (fill_rtattr) {
+		ret = fill_rtattr(&req.nh);
+		if (ret)
+			return ret;
+	}
+
+	link_info = rtattr_begin(&req.nh, IFLA_LINKINFO);
+
+	rtattr_add_strsz(&req.nh, IFLA_INFO_KIND, link_type);
+
+	if (fill_info_data) {
+		info_data = rtattr_begin(&req.nh, IFLA_INFO_DATA);
+		ret = fill_info_data(&req.nh);
+		if (ret)
+			return ret;
+		rtattr_end(&req.nh, info_data);
+	}
+
+	rtattr_end(&req.nh, link_info);
+
+	ret = send(rtnl, &req, req.nh.nlmsg_len, 0);
+	if (ret < 0)
+		fprintf(stderr, "%s: send %s\n", __func__, strerror(errno));
+	ret = (unsigned int)ret != req.nh.nlmsg_len;
+
+	close(rtnl);
+	return ret;
+}
+
+static int dev_delete(const char *dev)
+{
+	struct {
+		struct nlmsghdr nh;
+		struct ifinfomsg info;
+		unsigned char data[MAX_RTNL_PAYLOAD];
+	} req;
+	int ret, rtnl;
+
+	rtnl = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
+	if (rtnl < 0) {
+		fprintf(stderr, "%s: socket %s\n", __func__, strerror(errno));
+		return 1;
+	}
+
+	memset(&req, 0, sizeof(req));
+	req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(req.info));
+	req.nh.nlmsg_flags = NLM_F_REQUEST;
+	req.nh.nlmsg_type = RTM_DELLINK;
+
+	req.info.ifi_family = AF_UNSPEC;
+
+	rtattr_add_str(&req.nh, IFLA_IFNAME, dev);
+
+	ret = send(rtnl, &req, req.nh.nlmsg_len, 0);
+	if (ret < 0)
+		fprintf(stderr, "%s: send %s\n", __func__, strerror(errno));
+
+	ret = (unsigned int)ret != req.nh.nlmsg_len;
+
+	close(rtnl);
+	return ret;
+}
+
+static int macvtap_fill_rtattr(struct nlmsghdr *nh)
+{
+	int ifindex;
+
+	ifindex = if_nametoindex(param_dev_dummy_name);
+	if (ifindex == 0) {
+		fprintf(stderr, "%s: ifindex  %s\n", __func__, strerror(errno));
+		return -errno;
+	}
+
+	rtattr_add_any(nh, IFLA_LINK, &ifindex, sizeof(ifindex));
+	rtattr_add_any(nh, IFLA_ADDRESS, param_hwaddr_src, ETH_ALEN);
+
+	return 0;
+}
+
+static int opentap(const char *devname)
+{
+	int ifindex;
+	char buf[256];
+	int fd;
+	struct ifreq ifr;
+
+	ifindex = if_nametoindex(devname);
+	if (ifindex == 0) {
+		fprintf(stderr, "%s: ifindex %s\n", __func__, strerror(errno));
+		return -errno;
+	}
+
+	sprintf(buf, "/dev/tap%d", ifindex);
+	fd = open(buf, O_RDWR | O_NONBLOCK);
+	if (fd < 0) {
+		fprintf(stderr, "%s: open %s\n", __func__, strerror(errno));
+		return -errno;
+	}
+
+	memset(&ifr, 0, sizeof(ifr));
+	strcpy(ifr.ifr_name, devname);
+	ifr.ifr_flags = IFF_TAP | IFF_NO_PI | IFF_VNET_HDR | IFF_MULTI_QUEUE;
+	if (ioctl(fd, TUNSETIFF, &ifr, sizeof(ifr)) < 0)
+		return -errno;
+	return fd;
+}
+
+size_t build_eth(uint8_t *buf, uint16_t proto)
+{
+	struct ethhdr *eth = (struct ethhdr *)buf;
+
+	eth->h_proto = htons(proto);
+	memcpy(eth->h_source, param_hwaddr_src, ETH_ALEN);
+	memcpy(eth->h_dest, param_hwaddr_dest, ETH_ALEN);
+
+	return ETH_HLEN;
+}
+
+static uint32_t add_csum(const uint8_t *buf, int len)
+{
+	uint32_t sum = 0;
+	uint16_t *sbuf = (uint16_t *)buf;
+
+	while (len > 1) {
+		sum += *sbuf++;
+		len -= 2;
+	}
+
+	if (len)
+		sum += *(uint8_t *)sbuf;
+
+	return sum;
+}
+
+static uint16_t finish_ip_csum(uint32_t sum)
+{
+	uint16_t lo = sum & 0xffff;
+	uint16_t hi = sum >> 16;
+
+	return ~(lo + hi);
+
+}
+
+static uint16_t build_ip_csum(const uint8_t *buf, int len,
+			      uint32_t sum)
+{
+	sum += add_csum(buf, len);
+	return finish_ip_csum(sum);
+}
+
+static int build_ipv4_header(uint8_t *buf, int payload_len)
+{
+	struct iphdr *iph = (struct iphdr *)buf;
+
+	iph->ihl = 5;
+	iph->version = 4;
+	iph->ttl = 8;
+	iph->tot_len =
+		htons(sizeof(*iph) + sizeof(struct udphdr) + payload_len);
+	iph->id = htons(1337);
+	iph->protocol = IPPROTO_UDP;
+	iph->saddr = htonl((172 << 24) | (17 << 16) | 2);
+	iph->daddr = htonl((172 << 24) | (17 << 16) | 1);
+	iph->check = build_ip_csum(buf, iph->ihl << 2, 0);
+
+	return iph->ihl << 2;
+}
+
+static int build_udp_packet(uint8_t *buf, int payload_len, bool csum_off)
+{
+	const int ip4alen = sizeof(uint32_t);
+	struct udphdr *udph = (struct udphdr *)buf;
+	int len = sizeof(*udph) + payload_len;
+	uint32_t sum = 0;
+
+	udph->source = htons(22);
+	udph->dest = htons(58822);
+	udph->len = htons(len);
+
+	memset(buf + sizeof(struct udphdr), PKT_DATA, payload_len);
+
+	sum = add_csum(buf - 2 * ip4alen, 2 * ip4alen);
+	sum += htons(IPPROTO_UDP) + udph->len;
+
+	if (!csum_off)
+		sum += add_csum(buf, len);
+
+	udph->check = finish_ip_csum(sum);
+
+	return sizeof(*udph) + payload_len;
+}
+
+size_t build_test_packet_valid_udp_gso(uint8_t *buf, size_t payload_len)
+{
+	uint8_t *cur = buf;
+	struct virtio_net_hdr *vh = (struct virtio_net_hdr *)buf;
+
+	vh->hdr_len = ETH_HLEN + sizeof(struct iphdr) + sizeof(struct udphdr);
+	vh->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;
+	vh->csum_start = ETH_HLEN + sizeof(struct iphdr);
+	vh->csum_offset = __builtin_offsetof(struct udphdr, check);
+	vh->gso_type = VIRTIO_NET_HDR_GSO_UDP;
+	vh->gso_size = ETH_DATA_LEN - sizeof(struct iphdr);
+	cur += sizeof(*vh);
+
+	cur += build_eth(cur, ETH_P_IP);
+	cur += build_ipv4_header(cur, payload_len);
+	cur += build_udp_packet(cur, payload_len, true);
+
+	return cur - buf;
+}
+
+size_t build_test_packet_valid_udp_csum(uint8_t *buf, size_t payload_len)
+{
+	uint8_t *cur = buf;
+	struct virtio_net_hdr *vh = (struct virtio_net_hdr *)buf;
+
+	vh->flags = VIRTIO_NET_HDR_F_DATA_VALID;
+	vh->gso_type = VIRTIO_NET_HDR_GSO_NONE;
+	cur += sizeof(*vh);
+
+	cur += build_eth(cur, ETH_P_IP);
+	cur += build_ipv4_header(cur, payload_len);
+	cur += build_udp_packet(cur, payload_len, false);
+
+	return cur - buf;
+}
+
+size_t build_test_packet_crash_tap_invalid_eth_proto(uint8_t *buf,
+						     size_t payload_len)
+{
+	uint8_t *cur = buf;
+	struct virtio_net_hdr *vh = (struct virtio_net_hdr *)buf;
+
+	vh->hdr_len = ETH_HLEN + sizeof(struct iphdr) + sizeof(struct udphdr);
+	vh->flags = 0;
+	vh->gso_type = VIRTIO_NET_HDR_GSO_UDP;
+	vh->gso_size = ETH_DATA_LEN - sizeof(struct iphdr);
+	cur += sizeof(*vh);
+
+	cur += build_eth(cur, 0);
+	cur += sizeof(struct iphdr) + sizeof(struct udphdr);
+	cur += build_ipv4_header(cur, payload_len);
+	cur += build_udp_packet(cur, payload_len, true);
+	cur += payload_len;
+
+	return cur - buf;
+}
+
+FIXTURE(tap)
+{
+	int fd;
+};
+
+FIXTURE_SETUP(tap)
+{
+	int ret;
+
+	ret = dev_create(param_dev_dummy_name, "dummy", NULL, NULL);
+	EXPECT_EQ(ret, 0);
+
+	ret = dev_create(param_dev_tap_name, "macvtap", macvtap_fill_rtattr,
+			 NULL);
+	EXPECT_EQ(ret, 0);
+
+	self->fd = opentap(param_dev_tap_name);
+	ASSERT_GE(self->fd, 0);
+}
+
+FIXTURE_TEARDOWN(tap)
+{
+	int ret;
+
+	if (self->fd != -1)
+		close(self->fd);
+
+	ret = dev_delete(param_dev_tap_name);
+	EXPECT_EQ(ret, 0);
+
+	ret = dev_delete(param_dev_dummy_name);
+	EXPECT_EQ(ret, 0);
+}
+
+TEST_F(tap, test_packet_valid_udp_gso)
+{
+	uint8_t pkt[TEST_PACKET_SZ];
+	size_t off;
+	int ret;
+
+	memset(pkt, 0, sizeof(pkt));
+	off = build_test_packet_valid_udp_gso(pkt, 1021);
+	ret = write(self->fd, pkt, off);
+	ASSERT_EQ(ret, off);
+}
+
+TEST_F(tap, test_packet_valid_udp_csum)
+{
+	uint8_t pkt[TEST_PACKET_SZ];
+	size_t off;
+	int ret;
+
+	memset(pkt, 0, sizeof(pkt));
+	off = build_test_packet_valid_udp_csum(pkt, 1024);
+	ret = write(self->fd, pkt, off);
+	ASSERT_EQ(ret, off);
+}
+
+TEST_F(tap, test_packet_crash_tap_invalid_eth_proto)
+{
+	uint8_t pkt[TEST_PACKET_SZ];
+	size_t off;
+	int ret;
+
+	memset(pkt, 0, sizeof(pkt));
+	off = build_test_packet_crash_tap_invalid_eth_proto(pkt, 1024);
+	ret = write(self->fd, pkt, off);
+	ASSERT_EQ(ret, -1);
+	ASSERT_EQ(errno, EINVAL);
+}
+
+TEST_HARNESS_MAIN
diff --git a/tools/testing/selftests/netfilter/nft_trans_stress.sh b/tools/testing/selftests/netfilter/nft_trans_stress.sh
index f1affd12c4b1..a7f62ad4f661 100755
--- a/tools/testing/selftests/netfilter/nft_trans_stress.sh
+++ b/tools/testing/selftests/netfilter/nft_trans_stress.sh
@@ -9,8 +9,27 @@
 # Kselftest framework requirement - SKIP code is 4.
 ksft_skip=4
 
-testns=testns1
+testns=testns-$(mktemp -u "XXXXXXXX")
+
 tables="foo bar baz quux"
+global_ret=0
+eret=0
+lret=0
+
+check_result()
+{
+	local r=$1
+	local OK="PASS"
+
+	if [ $r -ne 0 ] ;then
+		OK="FAIL"
+		global_ret=$r
+	fi
+
+	echo "$OK: nft $2 test returned $r"
+
+	eret=0
+}
 
 nft --version > /dev/null 2>&1
 if [ $? -ne 0 ];then
@@ -59,16 +78,66 @@ done)
 
 sleep 1
 
+ip netns exec "$testns" nft -f "$tmp"
 for i in $(seq 1 10) ; do ip netns exec "$testns" nft -f "$tmp" & done
 
 for table in $tables;do
-	randsleep=$((RANDOM%10))
+	randsleep=$((RANDOM%2))
 	sleep $randsleep
-	ip netns exec "$testns" nft delete table inet $table 2>/dev/null
+	ip netns exec "$testns" nft delete table inet $table
+	lret=$?
+	if [ $lret -ne 0 ]; then
+		eret=$lret
+	fi
 done
 
-randsleep=$((RANDOM%10))
-sleep $randsleep
+check_result $eret "add/delete"
+
+for i in $(seq 1 10) ; do
+	(echo "flush ruleset"; cat "$tmp") | ip netns exec "$testns" nft -f /dev/stdin
+
+	lret=$?
+	if [ $lret -ne 0 ]; then
+		eret=$lret
+	fi
+done
+
+check_result $eret "reload"
+
+for i in $(seq 1 10) ; do
+	(echo "flush ruleset"; cat "$tmp"
+	 echo "insert rule inet foo INPUT meta nftrace set 1"
+	 echo "insert rule inet foo OUTPUT meta nftrace set 1"
+	 ) | ip netns exec "$testns" nft -f /dev/stdin
+	lret=$?
+	if [ $lret -ne 0 ]; then
+		eret=$lret
+	fi
+
+	(echo "flush ruleset"; cat "$tmp"
+	 ) | ip netns exec "$testns" nft -f /dev/stdin
+
+	lret=$?
+	if [ $lret -ne 0 ]; then
+		eret=$lret
+	fi
+done
+
+check_result $eret "add/delete with nftrace enabled"
+
+echo "insert rule inet foo INPUT meta nftrace set 1" >> $tmp
+echo "insert rule inet foo OUTPUT meta nftrace set 1" >> $tmp
+
+for i in $(seq 1 10) ; do
+	(echo "flush ruleset"; cat "$tmp") | ip netns exec "$testns" nft -f /dev/stdin
+
+	lret=$?
+	if [ $lret -ne 0 ]; then
+		eret=1
+	fi
+done
+
+check_result $lret "add/delete with nftrace enabled"
 
 pkill -9 ping
 
@@ -76,3 +145,5 @@ wait
 
 rm -f "$tmp"
 ip netns del "$testns"
+
+exit $global_ret