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linux/tools/testing/selftests/bpf/prog_tests/sockmap_strp.c
Jiayuan Chen 6fcfe96e0f selftests/bpf: Add strparser test for bpf 
Add test cases for bpf + strparser and separated them from
sockmap_basic, as strparser has more encapsulation and parsing
capabilities compared to standard sockmap.

Signed-off-by: Jiayuan Chen <mrpre@163.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Acked-by: Jakub Sitnicki <jakub@cloudflare.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://patch.msgid.link/20250122100917.49845-6-mrpre@163.com
2025-01-29 13:32:48 -08:00

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13 KiB
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// SPDX-License-Identifier: GPL-2.0
#include <error.h>
#include <netinet/tcp.h>
#include <test_progs.h>
#include "sockmap_helpers.h"
#include "test_skmsg_load_helpers.skel.h"
#include "test_sockmap_strp.skel.h"
#define STRP_PKT_HEAD_LEN 4
#define STRP_PKT_BODY_LEN 6
#define STRP_PKT_FULL_LEN (STRP_PKT_HEAD_LEN + STRP_PKT_BODY_LEN)
static const char packet[STRP_PKT_FULL_LEN] = "head+body\0";
static const int test_packet_num = 100;
/* Current implementation of tcp_bpf_recvmsg_parser() invokes data_ready
* with sk held if an skb exists in sk_receive_queue. Then for the
* data_ready implementation of strparser, it will delay the read
* operation if sk is held and EAGAIN is returned.
*/
static int sockmap_strp_consume_pre_data(int p)
{
int recvd;
bool retried = false;
char rcv[10];
retry:
errno = 0;
recvd = recv_timeout(p, rcv, sizeof(rcv), 0, 1);
if (recvd < 0 && errno == EAGAIN && retried == false) {
/* On the first call, EAGAIN will certainly be returned.
* A 1-second wait is enough for the workqueue to finish.
*/
sleep(1);
retried = true;
goto retry;
}
if (!ASSERT_EQ(recvd, STRP_PKT_FULL_LEN, "recv error or truncated data") ||
!ASSERT_OK(memcmp(packet, rcv, STRP_PKT_FULL_LEN),
"data mismatch"))
return -1;
return 0;
}
static struct test_sockmap_strp *sockmap_strp_init(int *out_map, bool pass,
bool need_parser)
{
struct test_sockmap_strp *strp = NULL;
int verdict, parser;
int err;
strp = test_sockmap_strp__open_and_load();
*out_map = bpf_map__fd(strp->maps.sock_map);
if (need_parser)
parser = bpf_program__fd(strp->progs.prog_skb_parser_partial);
else
parser = bpf_program__fd(strp->progs.prog_skb_parser);
if (pass)
verdict = bpf_program__fd(strp->progs.prog_skb_verdict_pass);
else
verdict = bpf_program__fd(strp->progs.prog_skb_verdict);
err = bpf_prog_attach(parser, *out_map, BPF_SK_SKB_STREAM_PARSER, 0);
if (!ASSERT_OK(err, "bpf_prog_attach stream parser"))
goto err;
err = bpf_prog_attach(verdict, *out_map, BPF_SK_SKB_STREAM_VERDICT, 0);
if (!ASSERT_OK(err, "bpf_prog_attach stream verdict"))
goto err;
return strp;
err:
test_sockmap_strp__destroy(strp);
return NULL;
}
/* Dispatch packets to different socket by packet size:
*
* ------ ------
* | pkt4 || pkt1 |... > remote socket
* ------ ------ / ------ ------
* | pkt8 | pkt7 |...
* ------ ------ \ ------ ------
* | pkt3 || pkt2 |... > local socket
* ------ ------
*/
static void test_sockmap_strp_dispatch_pkt(int family, int sotype)
{
int i, j, zero = 0, one = 1, recvd;
int err, map;
int c0 = -1, p0 = -1, c1 = -1, p1 = -1;
struct test_sockmap_strp *strp = NULL;
int test_cnt = 6;
char rcv[10];
struct {
char data[7];
int data_len;
int send_cnt;
int *receiver;
} send_dir[2] = {
/* data expected to deliver to local */
{"llllll", 6, 0, &p0},
/* data expected to deliver to remote */
{"rrrrr", 5, 0, &c1}
};
strp = sockmap_strp_init(&map, false, false);
if (!ASSERT_TRUE(strp, "sockmap_strp_init"))
return;
err = create_socket_pairs(family, sotype, &c0, &c1, &p0, &p1);
if (!ASSERT_OK(err, "create_socket_pairs()"))
goto out;
err = bpf_map_update_elem(map, &zero, &p0, BPF_NOEXIST);
if (!ASSERT_OK(err, "bpf_map_update_elem(p0)"))
goto out_close;
err = bpf_map_update_elem(map, &one, &p1, BPF_NOEXIST);
if (!ASSERT_OK(err, "bpf_map_update_elem(p1)"))
goto out_close;
err = setsockopt(c1, IPPROTO_TCP, TCP_NODELAY, &zero, sizeof(zero));
if (!ASSERT_OK(err, "setsockopt(TCP_NODELAY)"))
goto out_close;
/* deliver data with data size greater than 5 to local */
strp->data->verdict_max_size = 5;
for (i = 0; i < test_cnt; i++) {
int d = i % 2;
xsend(c0, send_dir[d].data, send_dir[d].data_len, 0);
send_dir[d].send_cnt++;
}
for (i = 0; i < 2; i++) {
for (j = 0; j < send_dir[i].send_cnt; j++) {
int expected = send_dir[i].data_len;
recvd = recv_timeout(*send_dir[i].receiver, rcv,
expected, MSG_DONTWAIT,
IO_TIMEOUT_SEC);
if (!ASSERT_EQ(recvd, expected, "recv_timeout()"))
goto out_close;
if (!ASSERT_OK(memcmp(send_dir[i].data, rcv, recvd),
"data mismatch"))
goto out_close;
}
}
out_close:
close(c0);
close(c1);
close(p0);
close(p1);
out:
test_sockmap_strp__destroy(strp);
}
/* We have multiple packets in one skb
* ------------ ------------ ------------
* | packet1 | packet2 | ...
* ------------ ------------ ------------
*/
static void test_sockmap_strp_multiple_pkt(int family, int sotype)
{
int i, zero = 0;
int sent, recvd, total;
int err, map;
int c = -1, p = -1;
struct test_sockmap_strp *strp = NULL;
char *snd = NULL, *rcv = NULL;
strp = sockmap_strp_init(&map, true, true);
if (!ASSERT_TRUE(strp, "sockmap_strp_init"))
return;
err = create_pair(family, sotype, &c, &p);
if (err)
goto out;
err = bpf_map_update_elem(map, &zero, &p, BPF_NOEXIST);
if (!ASSERT_OK(err, "bpf_map_update_elem(zero, p)"))
goto out_close;
/* construct multiple packets in one buffer */
total = test_packet_num * STRP_PKT_FULL_LEN;
snd = malloc(total);
rcv = malloc(total + 1);
if (!ASSERT_TRUE(snd, "malloc(snd)") ||
!ASSERT_TRUE(rcv, "malloc(rcv)"))
goto out_close;
for (i = 0; i < test_packet_num; i++) {
memcpy(snd + i * STRP_PKT_FULL_LEN,
packet, STRP_PKT_FULL_LEN);
}
sent = xsend(c, snd, total, 0);
if (!ASSERT_EQ(sent, total, "xsend(c)"))
goto out_close;
/* try to recv one more byte to avoid truncation check */
recvd = recv_timeout(p, rcv, total + 1, MSG_DONTWAIT, IO_TIMEOUT_SEC);
if (!ASSERT_EQ(recvd, total, "recv(rcv)"))
goto out_close;
/* we sent TCP segment with multiple encapsulation
* then check whether packets are handled correctly
*/
if (!ASSERT_OK(memcmp(snd, rcv, total), "data mismatch"))
goto out_close;
out_close:
close(c);
close(p);
if (snd)
free(snd);
if (rcv)
free(rcv);
out:
test_sockmap_strp__destroy(strp);
}
/* Test strparser with partial read */
static void test_sockmap_strp_partial_read(int family, int sotype)
{
int zero = 0, recvd, off;
int err, map;
int c = -1, p = -1;
struct test_sockmap_strp *strp = NULL;
char rcv[STRP_PKT_FULL_LEN + 1] = "0";
strp = sockmap_strp_init(&map, true, true);
if (!ASSERT_TRUE(strp, "sockmap_strp_init"))
return;
err = create_pair(family, sotype, &c, &p);
if (err)
goto out;
/* sk_data_ready of 'p' will be replaced by strparser handler */
err = bpf_map_update_elem(map, &zero, &p, BPF_NOEXIST);
if (!ASSERT_OK(err, "bpf_map_update_elem(zero, p)"))
goto out_close;
/* 1.1 send partial head, 1 byte header left */
off = STRP_PKT_HEAD_LEN - 1;
xsend(c, packet, off, 0);
recvd = recv_timeout(p, rcv, sizeof(rcv), MSG_DONTWAIT, 1);
if (!ASSERT_EQ(-1, recvd, "partial head sent, expected no data"))
goto out_close;
/* 1.2 send remaining head and body */
xsend(c, packet + off, STRP_PKT_FULL_LEN - off, 0);
recvd = recv_timeout(p, rcv, sizeof(rcv), MSG_DONTWAIT, IO_TIMEOUT_SEC);
if (!ASSERT_EQ(recvd, STRP_PKT_FULL_LEN, "expected full data"))
goto out_close;
/* 2.1 send partial head, 1 byte header left */
off = STRP_PKT_HEAD_LEN - 1;
xsend(c, packet, off, 0);
/* 2.2 send remaining head and partial body, 1 byte body left */
xsend(c, packet + off, STRP_PKT_FULL_LEN - off - 1, 0);
off = STRP_PKT_FULL_LEN - 1;
recvd = recv_timeout(p, rcv, sizeof(rcv), MSG_DONTWAIT, 1);
if (!ASSERT_EQ(-1, recvd, "partial body sent, expected no data"))
goto out_close;
/* 2.3 send remaining body */
xsend(c, packet + off, STRP_PKT_FULL_LEN - off, 0);
recvd = recv_timeout(p, rcv, sizeof(rcv), MSG_DONTWAIT, IO_TIMEOUT_SEC);
if (!ASSERT_EQ(recvd, STRP_PKT_FULL_LEN, "expected full data"))
goto out_close;
out_close:
close(c);
close(p);
out:
test_sockmap_strp__destroy(strp);
}
/* Test simple socket read/write with strparser + FIONREAD */
static void test_sockmap_strp_pass(int family, int sotype, bool fionread)
{
int zero = 0, pkt_size = STRP_PKT_FULL_LEN, sent, recvd, avail;
int err, map;
int c = -1, p = -1;
int test_cnt = 10, i;
struct test_sockmap_strp *strp = NULL;
char rcv[STRP_PKT_FULL_LEN + 1] = "0";
strp = sockmap_strp_init(&map, true, true);
if (!ASSERT_TRUE(strp, "sockmap_strp_init"))
return;
err = create_pair(family, sotype, &c, &p);
if (err)
goto out;
/* inject some data before bpf process, it should be read
* correctly because we check sk_receive_queue in
* tcp_bpf_recvmsg_parser().
*/
sent = xsend(c, packet, pkt_size, 0);
if (!ASSERT_EQ(sent, pkt_size, "xsend(pre-data)"))
goto out_close;
/* sk_data_ready of 'p' will be replaced by strparser handler */
err = bpf_map_update_elem(map, &zero, &p, BPF_NOEXIST);
if (!ASSERT_OK(err, "bpf_map_update_elem(p)"))
goto out_close;
/* consume previous data we injected */
if (sockmap_strp_consume_pre_data(p))
goto out_close;
/* Previously, we encountered issues such as deadlocks and
* sequence errors that resulted in the inability to read
* continuously. Therefore, we perform multiple iterations
* of testing here.
*/
for (i = 0; i < test_cnt; i++) {
sent = xsend(c, packet, pkt_size, 0);
if (!ASSERT_EQ(sent, pkt_size, "xsend(c)"))
goto out_close;
recvd = recv_timeout(p, rcv, sizeof(rcv), MSG_DONTWAIT,
IO_TIMEOUT_SEC);
if (!ASSERT_EQ(recvd, pkt_size, "recv_timeout(p)") ||
!ASSERT_OK(memcmp(packet, rcv, pkt_size),
"memcmp, data mismatch"))
goto out_close;
}
if (fionread) {
sent = xsend(c, packet, pkt_size, 0);
if (!ASSERT_EQ(sent, pkt_size, "second xsend(c)"))
goto out_close;
err = ioctl(p, FIONREAD, &avail);
if (!ASSERT_OK(err, "ioctl(FIONREAD) error") ||
!ASSERT_EQ(avail, pkt_size, "ioctl(FIONREAD)"))
goto out_close;
recvd = recv_timeout(p, rcv, sizeof(rcv), MSG_DONTWAIT,
IO_TIMEOUT_SEC);
if (!ASSERT_EQ(recvd, pkt_size, "second recv_timeout(p)") ||
!ASSERT_OK(memcmp(packet, rcv, pkt_size),
"second memcmp, data mismatch"))
goto out_close;
}
out_close:
close(c);
close(p);
out:
test_sockmap_strp__destroy(strp);
}
/* Test strparser with verdict mode */
static void test_sockmap_strp_verdict(int family, int sotype)
{
int zero = 0, one = 1, sent, recvd, off;
int err, map;
int c0 = -1, p0 = -1, c1 = -1, p1 = -1;
struct test_sockmap_strp *strp = NULL;
char rcv[STRP_PKT_FULL_LEN + 1] = "0";
strp = sockmap_strp_init(&map, false, true);
if (!ASSERT_TRUE(strp, "sockmap_strp_init"))
return;
/* We simulate a reverse proxy server.
* When p0 receives data from c0, we forward it to c1.
* From c1's perspective, it will consider this data
* as being sent by p1.
*/
err = create_socket_pairs(family, sotype, &c0, &c1, &p0, &p1);
if (!ASSERT_OK(err, "create_socket_pairs()"))
goto out;
err = bpf_map_update_elem(map, &zero, &p0, BPF_NOEXIST);
if (!ASSERT_OK(err, "bpf_map_update_elem(p0)"))
goto out_close;
err = bpf_map_update_elem(map, &one, &p1, BPF_NOEXIST);
if (!ASSERT_OK(err, "bpf_map_update_elem(p1)"))
goto out_close;
sent = xsend(c0, packet, STRP_PKT_FULL_LEN, 0);
if (!ASSERT_EQ(sent, STRP_PKT_FULL_LEN, "xsend(c0)"))
goto out_close;
recvd = recv_timeout(c1, rcv, sizeof(rcv), MSG_DONTWAIT,
IO_TIMEOUT_SEC);
if (!ASSERT_EQ(recvd, STRP_PKT_FULL_LEN, "recv_timeout(c1)") ||
!ASSERT_OK(memcmp(packet, rcv, STRP_PKT_FULL_LEN),
"received data does not match the sent data"))
goto out_close;
/* send again to ensure the stream is functioning correctly. */
sent = xsend(c0, packet, STRP_PKT_FULL_LEN, 0);
if (!ASSERT_EQ(sent, STRP_PKT_FULL_LEN, "second xsend(c0)"))
goto out_close;
/* partial read */
off = STRP_PKT_FULL_LEN / 2;
recvd = recv_timeout(c1, rcv, off, MSG_DONTWAIT,
IO_TIMEOUT_SEC);
recvd += recv_timeout(c1, rcv + off, sizeof(rcv) - off, MSG_DONTWAIT,
IO_TIMEOUT_SEC);
if (!ASSERT_EQ(recvd, STRP_PKT_FULL_LEN, "partial recv_timeout(c1)") ||
!ASSERT_OK(memcmp(packet, rcv, STRP_PKT_FULL_LEN),
"partial received data does not match the sent data"))
goto out_close;
out_close:
close(c0);
close(c1);
close(p0);
close(p1);
out:
test_sockmap_strp__destroy(strp);
}
void test_sockmap_strp(void)
{
if (test__start_subtest("sockmap strp tcp pass"))
test_sockmap_strp_pass(AF_INET, SOCK_STREAM, false);
if (test__start_subtest("sockmap strp tcp v6 pass"))
test_sockmap_strp_pass(AF_INET6, SOCK_STREAM, false);
if (test__start_subtest("sockmap strp tcp pass fionread"))
test_sockmap_strp_pass(AF_INET, SOCK_STREAM, true);
if (test__start_subtest("sockmap strp tcp v6 pass fionread"))
test_sockmap_strp_pass(AF_INET6, SOCK_STREAM, true);
if (test__start_subtest("sockmap strp tcp verdict"))
test_sockmap_strp_verdict(AF_INET, SOCK_STREAM);
if (test__start_subtest("sockmap strp tcp v6 verdict"))
test_sockmap_strp_verdict(AF_INET6, SOCK_STREAM);
if (test__start_subtest("sockmap strp tcp partial read"))
test_sockmap_strp_partial_read(AF_INET, SOCK_STREAM);
if (test__start_subtest("sockmap strp tcp multiple packets"))
test_sockmap_strp_multiple_pkt(AF_INET, SOCK_STREAM);
if (test__start_subtest("sockmap strp tcp dispatch"))
test_sockmap_strp_dispatch_pkt(AF_INET, SOCK_STREAM);
}
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