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Message-Id: <20240123223612.1015788-2-john.fastabend@gmail.com>
Date: Tue, 23 Jan 2024 14:36:09 -0800
From: John Fastabend <john.fastabend@...il.com>
To: netdev@...r.kernel.org,
jakub@...udflare.com
Cc: john.fastabend@...il.com,
bpf@...r.kernel.org
Subject: [PATCH bpf-next 1/4] bpf: sockmap, add test for sk_msg prog pop msg helper
For msg_pop sk_msg helpers we only have older tests in test_sockmap, but
these are showing their age. They don't use any of the newer style BPF
and also require running test_sockmap. Lets use the prog_test framework
and add a test for msg_pop.
This is a much nicer test env using newer style BPF. We can
extend this to support all the other helpers shortly.
The bpf program is a template that lets us run through all the helpers
so we can cover not just pop, but all the other helpers as well.
Signed-off-by: John Fastabend <john.fastabend@...il.com>
---
.../bpf/prog_tests/sockmap_helpers.h | 10 +
.../bpf/prog_tests/sockmap_msg_helpers.c | 210 ++++++++++++++++++
.../bpf/progs/test_sockmap_msg_helpers.c | 52 +++++
3 files changed, 272 insertions(+)
create mode 100644 tools/testing/selftests/bpf/prog_tests/sockmap_msg_helpers.c
create mode 100644 tools/testing/selftests/bpf/progs/test_sockmap_msg_helpers.c
diff --git a/tools/testing/selftests/bpf/prog_tests/sockmap_helpers.h b/tools/testing/selftests/bpf/prog_tests/sockmap_helpers.h
index e880f97bc44d..781cbdf01d7b 100644
--- a/tools/testing/selftests/bpf/prog_tests/sockmap_helpers.h
+++ b/tools/testing/selftests/bpf/prog_tests/sockmap_helpers.h
@@ -112,6 +112,16 @@
__ret; \
})
+#define xrecv_nonblock(fd, buf, len, flags) \
+ ({ \
+ ssize_t __ret = recv_timeout((fd), (buf), (len), (flags), \
+ IO_TIMEOUT_SEC); \
+ if (__ret == -1) \
+ FAIL_ERRNO("recv"); \
+ __ret; \
+ })
+
+
#define xsocket(family, sotype, flags) \
({ \
int __ret = socket(family, sotype, flags); \
diff --git a/tools/testing/selftests/bpf/prog_tests/sockmap_msg_helpers.c b/tools/testing/selftests/bpf/prog_tests/sockmap_msg_helpers.c
new file mode 100644
index 000000000000..0fe3172a6c43
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/sockmap_msg_helpers.c
@@ -0,0 +1,210 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2020 Cloudflare
+#include <error.h>
+#include <netinet/tcp.h>
+#include <sys/epoll.h>
+
+#include "test_progs.h"
+#include "test_sockmap_msg_helpers.skel.h"
+#include "sockmap_helpers.h"
+
+#define TCP_REPAIR 19 /* TCP sock is under repair right now */
+
+#define TCP_REPAIR_ON 1
+#define TCP_REPAIR_OFF_NO_WP -1 /* Turn off without window probes */
+
+struct msg_test_opts {
+ struct test_sockmap_msg_helpers *skel;
+ int server;
+ int client;
+};
+
+#define POP_END -1
+
+static void pop_simple_send(struct msg_test_opts *opts, int start, int len)
+{
+ struct test_sockmap_msg_helpers *skel = opts->skel;
+ char buf[] = "abcdefghijklmnopqrstuvwxyz";
+ char recvbuf[sizeof(buf)];
+ size_t sent, recv, cmp;
+
+ skel->bss->pop = true;
+
+ if (start == -1)
+ start = sizeof(buf) - len - 1;
+
+ skel->bss->pop_start = start;
+ skel->bss->pop_len = len;
+
+ sent = xsend(opts->client, buf, sizeof(buf), 0);
+ if (sent < sizeof(buf))
+ FAIL("xsend failed");
+
+ ASSERT_OK(skel->bss->err, "pop error");
+
+ recv = xrecv_nonblock(opts->server, recvbuf, sizeof(buf), 0);
+ if (recv != sent - skel->bss->pop_len)
+ FAIL("Received incorrect number number of bytes after pop");
+
+ cmp = memcmp(&buf[0], &recvbuf[0], start);
+ ASSERT_OK(cmp, "pop cmp start bytes failed");
+ cmp = memcmp(&buf[start+len], &recvbuf[start], sizeof(buf) - start - len);
+ ASSERT_OK(cmp, "pop cmp end bytes failed");
+}
+
+static void test_sockmap_pop(void)
+{
+ struct msg_test_opts opts;
+ struct test_sockmap_msg_helpers *skel;
+ int s, client, server;
+ int err, map, prog;
+
+ skel = test_sockmap_msg_helpers__open_and_load();
+ if (!ASSERT_OK_PTR(skel, "open_and_load"))
+ return;
+
+ map = bpf_map__fd(skel->maps.sock_map);
+ prog = bpf_program__fd(skel->progs.msg_helpers);
+ err = bpf_prog_attach(prog, map, BPF_SK_MSG_VERDICT, 0);
+ if (!ASSERT_OK(err, "bpf_prog_attach"))
+ goto out;
+
+ s = socket_loopback(AF_INET, SOCK_STREAM);
+ if (s < 0)
+ goto close_sockets;
+
+ err = create_pair(s, AF_INET, SOCK_STREAM, &client, &server);
+ if (err < 0)
+ goto close_loopback;
+
+ err = add_to_sockmap(map, client, server);
+ if (err < 0)
+ FAIL("add to sockmap");
+
+ opts.client = client;
+ opts.server = server;
+ opts.skel = skel;
+
+ /* Pop from start */
+ pop_simple_send(&opts, 0, 5);
+ /* Pop from the middle */
+ pop_simple_send(&opts, 10, 5);
+ /* Pop from end */
+ pop_simple_send(&opts, POP_END, 5);
+
+close_sockets:
+ close(client);
+ close(server);
+close_loopback:
+ close(s);
+out:
+ test_sockmap_msg_helpers__destroy(skel);
+}
+
+static void test_sockmap_pop_errors(void)
+{
+ char buf[] = "abcdefghijklmnopqrstuvwxyz";
+ struct test_sockmap_msg_helpers *skel;
+ int i, recv, err, map, prog;
+ char recvbuf[sizeof(buf)];
+ int s, client, server;
+
+ skel = test_sockmap_msg_helpers__open_and_load();
+ if (!ASSERT_OK_PTR(skel, "open_and_load"))
+ return;
+
+ map = bpf_map__fd(skel->maps.sock_map);
+ prog = bpf_program__fd(skel->progs.msg_helpers);
+ err = bpf_prog_attach(prog, map, BPF_SK_MSG_VERDICT, 0);
+ if (!ASSERT_OK(err, "bpf_prog_attach"))
+ goto out;
+
+ s = socket_loopback(AF_INET, SOCK_STREAM);
+ if (s < 0)
+ goto close_sockets;
+
+ err = create_pair(s, AF_INET, SOCK_STREAM, &client, &server);
+ if (err < 0)
+ goto close_loopback;
+
+ err = add_to_sockmap(map, client, server);
+ if (err < 0)
+ FAIL("add to sockmap");
+
+ skel->bss->pop = true;
+
+ /* Pop larger than buffer */
+ skel->bss->pop_start = 0;
+ skel->bss->pop_len = sizeof(buf) + 1;
+ xsend(client, buf, sizeof(buf), 0);
+ ASSERT_ERR(skel->bss->err, "popping more bytes than msg did not throw an error");
+ xrecv_nonblock(server, recvbuf, sizeof(recvbuf), 0);
+
+ /* Pop past end of buffer */
+ skel->bss->pop_start = sizeof(buf) - 5;
+ skel->bss->pop_len = 10;
+ xsend(client, buf, sizeof(buf), 0);
+ ASSERT_ERR(skel->bss->err, "popping past end of msg did not throw an error");
+ xrecv_nonblock(server, recvbuf, sizeof(recvbuf), 0);
+
+ /* Pop larger than buffer on complex send */
+ skel->bss->pop_start = 0;
+ skel->bss->pop_len = 0;
+ for (i = 0; i < 14; i++)
+ xsend(client, buf, sizeof(buf), MSG_MORE);
+ skel->bss->pop_start = 0;
+ skel->bss->pop_len = sizeof(buf) * 32;
+ xsend(client, buf, sizeof(buf), MSG_MORE);
+ ASSERT_ERR(skel->bss->err, "popping more bytes than sg msg did not throw an error");
+ i = 0;
+ do {
+ i++;
+ recv = xrecv_nonblock(server, recvbuf, sizeof(recvbuf), 0);
+ } while (recv > 0 && i < 15);
+
+ /* Pop past end of complex send */
+ skel->bss->pop_start = 0;
+ skel->bss->pop_len = 0;
+ for (i = 0; i < 14; i++)
+ xsend(client, buf, sizeof(buf), MSG_MORE);
+ skel->bss->pop_start = sizeof(buf) * 14;
+ skel->bss->pop_len = sizeof(buf) + 1;
+ xsend(client, buf, sizeof(buf), MSG_MORE);
+ ASSERT_ERR(skel->bss->err, "popping past end of sg msg did not throw an error");
+ i = 0;
+ do {
+ i++;
+ recv = xrecv_nonblock(server, recvbuf, sizeof(recvbuf), 0);
+ } while (recv > 0 && i < 15);
+
+ /* Pop past end of complex send starting in middle of last sg */
+ skel->bss->pop_start = 0;
+ skel->bss->pop_len = 0;
+ for (i = 0; i < 14; i++)
+ xsend(client, buf, sizeof(buf), MSG_MORE);
+ skel->bss->pop_start = (sizeof(buf) * 14) + sizeof(buf) - 5;
+ skel->bss->pop_len = 10;
+ xsend(client, buf, sizeof(buf), MSG_MORE);
+ ASSERT_ERR(skel->bss->err, "popping past end from offset of sg msg did not throw an error");
+ i = 0;
+ do {
+ i++;
+ recv = xrecv_nonblock(server, recvbuf, sizeof(recvbuf), 0);
+ } while (recv > 0 && i < 15);
+
+close_sockets:
+ close(client);
+ close(server);
+close_loopback:
+ close(s);
+out:
+ test_sockmap_msg_helpers__destroy(skel);
+}
+
+void test_sockmap_msg_helpers(void)
+{
+ if (test__start_subtest("sockmap pop"))
+ test_sockmap_pop();
+ if (test__start_subtest("sockmap pop errors"))
+ test_sockmap_pop_errors();
+}
diff --git a/tools/testing/selftests/bpf/progs/test_sockmap_msg_helpers.c b/tools/testing/selftests/bpf/progs/test_sockmap_msg_helpers.c
new file mode 100644
index 000000000000..c721a00b6001
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/test_sockmap_msg_helpers.c
@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2020 Cloudflare
+
+#include <errno.h>
+#include <stdbool.h>
+#include <linux/bpf.h>
+
+#include <bpf/bpf_helpers.h>
+
+struct {
+ __uint(type, BPF_MAP_TYPE_SOCKMAP);
+ __uint(max_entries, 2);
+ __type(key, __u32);
+ __type(value, __u64);
+} sock_map SEC(".maps");
+
+int cork = 0;
+
+bool pull = false;
+bool push = false;
+bool pop = false;
+
+int pull_start = 0;
+int pull_end = 0;
+
+int push_start = 0;
+int push_end = 0;
+
+int pop_start = 0;
+int pop_len = 0;
+
+int err;
+
+SEC("sk_msg")
+int msg_helpers(struct sk_msg_md *msg)
+{
+ if (cork)
+ err = bpf_msg_cork_bytes(msg, cork);
+
+ if (pull)
+ err = bpf_msg_pull_data(msg, pull_start, pull_end, 0);
+
+ if (push)
+ err = bpf_msg_push_data(msg, push_start, push_end, 0);
+
+ if (pop)
+ err = bpf_msg_pop_data(msg, pop_start, pop_len, 0);
+
+ return SK_PASS;
+}
+
+char _license[] SEC("license") = "GPL";
--
2.33.0
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