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Message-ID: <20250616185456.2644238-3-dw@davidwei.uk>
Date: Mon, 16 Jun 2025 11:54:54 -0700
From: David Wei <dw@...idwei.uk>
To: netdev@...r.kernel.org
Cc: Eric Dumazet <edumazet@...gle.com>,
Neal Cardwell <ncardwell@...gle.com>,
Kuniyuki Iwashima <kuniyu@...gle.com>,
"David S. Miller" <davem@...emloft.net>,
David Ahern <dsahern@...nel.org>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Simon Horman <horms@...nel.org>,
Andrew Lunn <andrew+netdev@...n.ch>,
Shuah Khan <shuah@...nel.org>
Subject: [PATCH net v1 2/4] selftests: net: add passive TFO test binary
Add a simple passive TFO server and client test binary. This will be
used to test the SO_INCOMING_NAPI_ID of passive TFO accepted sockets.
Signed-off-by: David Wei <dw@...idwei.uk>
---
tools/testing/selftests/net/.gitignore | 1 +
tools/testing/selftests/net/Makefile | 1 +
tools/testing/selftests/net/tfo.c | 171 +++++++++++++++++++++++++
3 files changed, 173 insertions(+)
create mode 100644 tools/testing/selftests/net/tfo.c
diff --git a/tools/testing/selftests/net/.gitignore b/tools/testing/selftests/net/.gitignore
index 532bb732bc6d..c6dd2a335cf4 100644
--- a/tools/testing/selftests/net/.gitignore
+++ b/tools/testing/selftests/net/.gitignore
@@ -50,6 +50,7 @@ tap
tcp_fastopen_backup_key
tcp_inq
tcp_mmap
+tfo
timestamping
tls
toeplitz
diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile
index ab996bd22a5f..ab8da438fd78 100644
--- a/tools/testing/selftests/net/Makefile
+++ b/tools/testing/selftests/net/Makefile
@@ -110,6 +110,7 @@ TEST_GEN_PROGS += proc_net_pktgen
TEST_PROGS += lwt_dst_cache_ref_loop.sh
TEST_PROGS += skf_net_off.sh
TEST_GEN_FILES += skf_net_off
+TEST_GEN_FILES += tfo
# YNL files, must be before "include ..lib.mk"
YNL_GEN_FILES := busy_poller netlink-dumps
diff --git a/tools/testing/selftests/net/tfo.c b/tools/testing/selftests/net/tfo.c
new file mode 100644
index 000000000000..eb3cac5e583c
--- /dev/null
+++ b/tools/testing/selftests/net/tfo.c
@@ -0,0 +1,171 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <error.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <arpa/inet.h>
+#include <sys/socket.h>
+#include <netinet/tcp.h>
+#include <errno.h>
+
+static int cfg_server;
+static int cfg_client;
+static int cfg_port = 8000;
+static struct sockaddr_in6 cfg_addr;
+static char *cfg_outfile;
+
+static int parse_address(const char *str, int port, struct sockaddr_in6 *sin6)
+{
+ int ret;
+
+ sin6->sin6_family = AF_INET6;
+ sin6->sin6_port = htons(port);
+
+ ret = inet_pton(sin6->sin6_family, str, &sin6->sin6_addr);
+ if (ret != 1) {
+ /* fallback to plain IPv4 */
+ ret = inet_pton(AF_INET, str, &sin6->sin6_addr.s6_addr32[3]);
+ if (ret != 1)
+ return -1;
+
+ /* add ::ffff prefix */
+ sin6->sin6_addr.s6_addr32[0] = 0;
+ sin6->sin6_addr.s6_addr32[1] = 0;
+ sin6->sin6_addr.s6_addr16[4] = 0;
+ sin6->sin6_addr.s6_addr16[5] = 0xffff;
+ }
+
+ return 0;
+}
+
+static void run_server(void)
+{
+ unsigned long qlen = 32;
+ int fd, opt, connfd;
+ socklen_t len;
+ char buf[64];
+ FILE *outfile;
+
+ outfile = fopen(cfg_outfile, "w");
+ if (!outfile)
+ error(1, errno, "fopen() outfile");
+
+ fd = socket(AF_INET6, SOCK_STREAM, 0);
+ if (fd == -1)
+ error(1, errno, "socket()");
+
+ opt = 1;
+ if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) < 0)
+ error(1, errno, "setsockopt(SO_REUSEADDR)");
+
+ if (setsockopt(fd, SOL_TCP, TCP_FASTOPEN, &qlen, sizeof(qlen)) < 0)
+ error(1, errno, "setsockopt(TCP_FASTOPEN)");
+
+ if (bind(fd, (struct sockaddr *)&cfg_addr, sizeof(cfg_addr)) < 0)
+ error(1, errno, "bind()");
+
+ if (listen(fd, 5) < 0)
+ error(1, errno, "listen()");
+
+ len = sizeof(cfg_addr);
+ connfd = accept(fd, (struct sockaddr *)&cfg_addr, &len);
+ if (connfd < 0)
+ error(1, errno, "accept()");
+
+ len = sizeof(opt);
+ if (getsockopt(connfd, SOL_SOCKET, SO_INCOMING_NAPI_ID, &opt, &len) < 0)
+ error(1, errno, "getsockopt(SO_INCOMING_NAPI_ID)");
+
+ read(connfd, buf, 64);
+ fprintf(outfile, "%d\n", opt);
+
+ fclose(outfile);
+ close(connfd);
+ close(fd);
+}
+
+static void run_client(void)
+{
+ int fd;
+ char *msg = "Hello, world!";
+
+ fd = socket(AF_INET6, SOCK_STREAM, 0);
+ if (fd == -1)
+ error(1, errno, "socket()");
+
+ sendto(fd, msg, strlen(msg), MSG_FASTOPEN, (struct sockaddr *)&cfg_addr, sizeof(cfg_addr));
+
+ close(fd);
+}
+
+static void usage(const char *filepath)
+{
+ error(1, 0, "Usage: %s (-s|-c) -h<server_ip> -p<port> -o<outfile> ", filepath);
+}
+
+static void parse_opts(int argc, char **argv)
+{
+ struct sockaddr_in6 *addr6 = (void *) &cfg_addr;
+ char *addr = NULL;
+ int ret;
+ int c;
+
+ if (argc <= 1)
+ usage(argv[0]);
+
+ while ((c = getopt(argc, argv, "sch:p:o:")) != -1) {
+ switch (c) {
+ case 's':
+ if (cfg_client)
+ error(1, 0, "Pass one of -s or -c");
+ cfg_server = 1;
+ break;
+ case 'c':
+ if (cfg_server)
+ error(1, 0, "Pass one of -s or -c");
+ cfg_client = 1;
+ break;
+ case 'h':
+ addr = optarg;
+ break;
+ case 'p':
+ cfg_port = strtoul(optarg, NULL, 0);
+ break;
+ case 'o':
+ cfg_outfile = strdup(optarg);
+ if (!cfg_outfile)
+ error(1, 0, "outfile invalid");
+ break;
+ }
+ }
+
+ if (cfg_server && addr)
+ error(1, 0, "Server cannot have -h specified");
+
+ memset(addr6, 0, sizeof(*addr6));
+ addr6->sin6_family = AF_INET6;
+ addr6->sin6_port = htons(cfg_port);
+ addr6->sin6_addr = in6addr_any;
+ if (addr) {
+ ret = parse_address(addr, cfg_port, addr6);
+ if (ret)
+ error(1, 0, "Client address parse error: %s", addr);
+ }
+}
+
+int main(int argc, char **argv)
+{
+ parse_opts(argc, argv);
+
+ if (cfg_server)
+ run_server();
+ else if (cfg_client)
+ run_client();
+
+ return 0;
+}
--
2.47.1
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