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selftests/net: test PACKET_IGNORE_OUTGOING

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Test that setsockopt PACKET_IGNORE_OUTGOING:

 - works with valid values (0 and 1),
 - rejects values outside of that range, and

When enabled for a loopback sniffer, it only produces 1 copy of the
packet (rx) instead of two copies (tx and rx). Use sll_pkttype to check
the direction of the packet to ensure the correct packet is sniffed.

Reviewed-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Joe Damato <joe@dama.to>
Link: https://patch.msgid.link/20260728160935.4128982-6-joe@dama.to
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Joe Damato
2026-07-28 09:09:30 -07:00
committed by Jakub Kicinski
parent f5a445d2a2
commit b75609e42b
2 changed files with 87 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

84
tools/testing/selftests/net/psock_snd.c
View File

@@ -41,6 +41,7 @@ static bool cfg_use_vlan;
static bool cfg_use_vnet;
static bool cfg_drop;
static bool cfg_aux_data;
static bool cfg_ignore_outgoing;
static char *cfg_ifname = "lo";
static int cfg_mtu = 1500;
@@ -377,7 +378,14 @@ static int setup_sniffer(void)
error(1, errno, "setsockopt PACKET_AUXDATA");
pair_udp_setfilter(fd);
do_bind(fd);
/* binding to ETH_P_ALL adds the sniffer to ptype_all, which will see
* the dev_queue_xmit_nit copy. ignore_outgoing should suppress this.
*/
if (cfg_ignore_outgoing)
do_bind_proto(fd, ETH_P_ALL);
else
do_bind(fd);
return fd;
}
@@ -386,7 +394,7 @@ static void parse_opts(int argc, char **argv)
{
int c;
while ((c = getopt(argc, argv, "abcCdDgl:qt:vV")) != -1) {
while ((c = getopt(argc, argv, "abcCdDgil:qt:vV")) != -1) {
switch (c) {
case 'a':
cfg_aux_data = true;
@@ -409,6 +417,9 @@ static void parse_opts(int argc, char **argv)
case 'g':
cfg_use_gso = true;
break;
case 'i':
cfg_ignore_outgoing = true;
break;
case 'l':
cfg_payload_len = strtoul(optarg, NULL, 0);
break;
@@ -443,6 +454,10 @@ static void parse_opts(int argc, char **argv)
if (cfg_aux_data && cfg_drop)
error(1, 0, "option aux data (-a) conflicts with drop (-D)");
if (cfg_ignore_outgoing && (cfg_drop || cfg_aux_data))
error(1, 0,
"option ignore outgoing (-i) conflicts with -D and -a");
}
static void check_packet_stats(int fd, unsigned int expected_packets)
@@ -486,6 +501,66 @@ static void check_packet_stats(int fd, unsigned int expected_packets)
error(1, 0, "stats: tp_drops %u != 0 after clear", st.tp_drops);
}
static void set_ignore_outgoing(int fd, int val)
{
socklen_t len = sizeof(int);
int got = -1;
if (setsockopt(fd, SOL_PACKET, PACKET_IGNORE_OUTGOING,
&val, sizeof(val)))
error(1, errno, "setsockopt PACKET_IGNORE_OUTGOING %d", val);
if (getsockopt(fd, SOL_PACKET, PACKET_IGNORE_OUTGOING, &got, &len))
error(1, errno, "getsockopt PACKET_IGNORE_OUTGOING");
if (got != val)
error(1, 0, "getsockopt: expected %d got %d", val, got);
}
static void check_ignore_outgoing_range(int fd)
{
int val;
/* Values outside [0, 1] must be rejected with -EINVAL. */
val = 2;
if (setsockopt(fd, SOL_PACKET, PACKET_IGNORE_OUTGOING,
&val, sizeof(val)) != -1 || errno != EINVAL)
error(1, errno,
"setsockopt PACKET_IGNORE_OUTGOING val=2: expected EINVAL");
val = -1;
if (setsockopt(fd, SOL_PACKET, PACKET_IGNORE_OUTGOING,
&val, sizeof(val)) != -1 || errno != EINVAL)
error(1, errno,
"setsockopt PACKET_IGNORE_OUTGOING val=-1: expected EINVAL");
}
static void test_ignore_outgoing(int fds)
{
char *expected = tbuf + sizeof(struct virtio_net_hdr);
int expected_len;
/* ptype_all sniffer on loopback should produce two copies per packet
* (RX and TX).
*/
expected_len = do_tx();
expected_len -= sizeof(struct virtio_net_hdr);
do_rx(fds, expected_len, expected, true, PACKET_OUTGOING);
do_rx(fds, expected_len, expected, true, PACKET_HOST);
check_packet_stats(fds, 2);
/* 0 and 1 accepted; anything else rejected. */
set_ignore_outgoing(fds, 0);
set_ignore_outgoing(fds, 1);
check_ignore_outgoing_range(fds);
/* With PACKET_IGNORE_OUTGOING set, only the rx copy survives. */
do_tx();
do_rx(fds, expected_len, expected, true, PACKET_HOST);
if (recv(fds, rbuf, sizeof(rbuf), 0) != -1 || errno != EAGAIN)
error(1, errno, "expected EAGAIN, got extra packet");
check_packet_stats(fds, 1);
}
static void run_test(void)
{
int fdr, fds, total_len;
@@ -493,6 +568,11 @@ static void run_test(void)
fdr = setup_rx();
fds = setup_sniffer();
if (cfg_ignore_outgoing) {
test_ignore_outgoing(fds);
goto out;
}
total_len = do_tx();
if (cfg_drop) {

5
tools/testing/selftests/net/psock_snd.sh
View File

@@ -102,4 +102,9 @@ echo "test drops statistics"
echo "test aux data"
./in_netns.sh ./psock_snd -a
# test ignore outgoing
echo "test ignore outgoing"
./in_netns.sh ./psock_snd -i
echo "OK. All tests passed"