selftest: add a reuseaddr test

This is to test for a regression introduced by

b9470c27607b ("inet: kill smallest_size and smallest_port")

which introduced a problem with reuseaddr and bind conflicts.

Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>

diff --git a/tools/testing/selftests/net/.gitignore b/tools/testing/selftests/net/.gitignore
index 9801253..c612d6e 100644 (file)
--- a/tools/testing/selftests/net/.gitignore
+++ b/tools/testing/selftests/net/.gitignore
@@ -6,3 +6,4 @@ reuseport_bpf
 reuseport_bpf_cpu
 reuseport_bpf_numa
 reuseport_dualstack
+reuseaddr_conflict

diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile
index de1f577..3df542c 100644 (file)
--- a/tools/testing/selftests/net/Makefile
+++ b/tools/testing/selftests/net/Makefile
@@ -7,7 +7,7 @@ TEST_PROGS := run_netsocktests run_afpackettests test_bpf.sh netdevice.sh rtnetl
 TEST_GEN_FILES =  socket
 TEST_GEN_FILES += psock_fanout psock_tpacket
 TEST_GEN_FILES += reuseport_bpf reuseport_bpf_cpu reuseport_bpf_numa
-TEST_GEN_FILES += reuseport_dualstack msg_zerocopy
+TEST_GEN_FILES += reuseport_dualstack msg_zerocopy reuseaddr_conflict
 
 include ../lib.mk
 

diff --git a/tools/testing/selftests/net/reuseaddr_conflict.c b/tools/testing/selftests/net/reuseaddr_conflict.c
new file mode 100644 (file)
index 0000000..7c5b126
--- /dev/null
+++ b/tools/testing/selftests/net/reuseaddr_conflict.c
@@ -0,0 +1,114 @@
+/*
+ * Test for the regression introduced by
+ *
+ * b9470c27607b ("inet: kill smallest_size and smallest_port")
+ *
+ * If we open an ipv4 socket on a port with reuseaddr we shouldn't reset the tb
+ * when we open the ipv6 conterpart, which is what was happening previously.
+ */
+#include <errno.h>
+#include <error.h>
+#include <arpa/inet.h>
+#include <netinet/in.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#define PORT 9999
+
+int open_port(int ipv6, int any)
+{
+       int fd = -1;
+       int reuseaddr = 1;
+       int v6only = 1;
+       int addrlen;
+       int ret = -1;
+       struct sockaddr *addr;
+       int family = ipv6 ? AF_INET6 : AF_INET;
+
+       struct sockaddr_in6 addr6 = {
+               .sin6_family = AF_INET6,
+               .sin6_port = htons(PORT),
+               .sin6_addr = in6addr_any
+       };
+       struct sockaddr_in addr4 = {
+               .sin_family = AF_INET,
+               .sin_port = htons(PORT),
+               .sin_addr.s_addr = any ? htonl(INADDR_ANY) : inet_addr("127.0.0.1"),
+       };
+
+
+       if (ipv6) {
+               addr = (struct sockaddr*)&addr6;
+               addrlen = sizeof(addr6);
+       } else {
+               addr = (struct sockaddr*)&addr4;
+               addrlen = sizeof(addr4);
+       }
+
+       if ((fd = socket(family, SOCK_STREAM, IPPROTO_TCP)) < 0) {
+               perror("socket");
+               goto out;
+       }
+
+       if (ipv6 && setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, (void*)&v6only,
+                              sizeof(v6only)) < 0) {
+               perror("setsockopt IPV6_V6ONLY");
+               goto out;
+       }
+
+       if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &reuseaddr,
+                      sizeof(reuseaddr)) < 0) {
+               perror("setsockopt SO_REUSEADDR");
+               goto out;
+       }
+
+       if (bind(fd, addr, addrlen) < 0) {
+               perror("bind");
+               goto out;
+       }
+
+       if (any)
+               return fd;
+
+       if (listen(fd, 1) < 0) {
+               perror("listen");
+               goto out;
+       }
+       return fd;
+out:
+       close(fd);
+       return ret;
+}
+
+int main(void)
+{
+       int listenfd;
+       int fd1, fd2;
+
+       fprintf(stderr, "Opening 127.0.0.1:%d\n", PORT);
+       listenfd = open_port(0, 0);
+       if (listenfd < 0)
+               error(1, errno, "Couldn't open listen socket");
+       fprintf(stderr, "Opening INADDR_ANY:%d\n", PORT);
+       fd1 = open_port(0, 1);
+       if (fd1 >= 0)
+               error(1, 0, "Was allowed to create an ipv4 reuseport on a already bound non-reuseport socket");
+       fprintf(stderr, "Opening in6addr_any:%d\n", PORT);
+       fd1 = open_port(1, 1);
+       if (fd1 < 0)
+               error(1, errno, "Couldn't open ipv6 reuseport");
+       fprintf(stderr, "Opening INADDR_ANY:%d\n", PORT);
+       fd2 = open_port(0, 1);
+       if (fd2 >= 0)
+               error(1, 0, "Was allowed to create an ipv4 reuseport on a already bound non-reuseport socket");
+       close(fd1);
+       fprintf(stderr, "Opening INADDR_ANY:%d after closing ipv6 socket\n", PORT);
+       fd1 = open_port(0, 1);
+       if (fd1 >= 0)
+               error(1, 0, "Was allowed to create an ipv4 reuseport on an already bound non-reuseport socket with no ipv6");
+       fprintf(stderr, "Success");
+       return 0;
+}