selftests: net: refactor reuseport_addr_any test

This patch refactors reuseport_add_any selftest a bit:
- makes it more modular (eliminates several copy/pasted blocks);
- skips DCCP tests if DCCP is not supported

V2: added "Signed-off-by" tag.

Signed-off-by: Peter Oskolkov <posk@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 38 insertions, 83 deletions

diff --git a/tools/testing/selftests/net/reuseport_addr_any.c b/tools/testing/selftests/net/reuseport_addr_any.c
index 4ac3e24b7cfc..6f54d425dba9 100644
--- a/tools/testing/selftests/net/reuseport_addr_any.c
+++ b/tools/testing/selftests/net/reuseport_addr_any.c
@@ -203,7 +203,9 @@ static void test(int *rcv_fds, int count, int family, int proto, int fd)
         close(epfd);
 }
 
-int main(void)
+
+static void run_one_test(int fam_send, int fam_rcv, int proto,
+                         const char *addr_str)
 {
         /* Below we test that a socket listening on a specific address
          * is always selected in preference over a socket listening
@@ -214,95 +216,48 @@ int main(void)
          */
         int rcv_fds[10], i;
 
-        fprintf(stderr, "---- UDP IPv4 ----\n");
-        build_rcv_fd(AF_INET, SOCK_DGRAM, rcv_fds, 2, NULL);
-        build_rcv_fd(AF_INET6, SOCK_DGRAM, rcv_fds + 2, 2, NULL);
-        build_rcv_fd(AF_INET, SOCK_DGRAM, rcv_fds + 4, 1, IP4_ADDR);
-        build_rcv_fd(AF_INET, SOCK_DGRAM, rcv_fds + 5, 2, NULL);
-        build_rcv_fd(AF_INET6, SOCK_DGRAM, rcv_fds + 7, 2, NULL);
-        test(rcv_fds, 9, AF_INET, SOCK_DGRAM, rcv_fds[4]);
-        for (i = 0; i < 9; ++i)
-                close(rcv_fds[i]);
-
-        fprintf(stderr, "---- UDP IPv6 ----\n");
-        build_rcv_fd(AF_INET, SOCK_DGRAM, rcv_fds, 2, NULL);
-        build_rcv_fd(AF_INET6, SOCK_DGRAM, rcv_fds + 2, 2, NULL);
-        build_rcv_fd(AF_INET6, SOCK_DGRAM, rcv_fds + 4, 1, IP6_ADDR);
-        build_rcv_fd(AF_INET, SOCK_DGRAM, rcv_fds + 5, 2, NULL);
-        build_rcv_fd(AF_INET6, SOCK_DGRAM, rcv_fds + 7, 2, NULL);
-        test(rcv_fds, 9, AF_INET6, SOCK_DGRAM, rcv_fds[4]);
-        for (i = 0; i < 9; ++i)
-                close(rcv_fds[i]);
-
-        fprintf(stderr, "---- UDP IPv4 mapped to IPv6 ----\n");
-        build_rcv_fd(AF_INET, SOCK_DGRAM, rcv_fds, 2, NULL);
-        build_rcv_fd(AF_INET6, SOCK_DGRAM, rcv_fds + 2, 2, NULL);
-        build_rcv_fd(AF_INET6, SOCK_DGRAM, rcv_fds + 4, 1, IP4_MAPPED6);
-        build_rcv_fd(AF_INET, SOCK_DGRAM, rcv_fds + 5, 2, NULL);
-        build_rcv_fd(AF_INET6, SOCK_DGRAM, rcv_fds + 7, 2, NULL);
-        test(rcv_fds, 9, AF_INET, SOCK_DGRAM, rcv_fds[4]);
-        for (i = 0; i < 9; ++i)
-                close(rcv_fds[i]);
-
-        fprintf(stderr, "---- TCP IPv4 ----\n");
-        build_rcv_fd(AF_INET, SOCK_STREAM, rcv_fds, 2, NULL);
-        build_rcv_fd(AF_INET6, SOCK_STREAM, rcv_fds + 2, 2, NULL);
-        build_rcv_fd(AF_INET, SOCK_STREAM, rcv_fds + 4, 1, IP4_ADDR);
-        build_rcv_fd(AF_INET, SOCK_STREAM, rcv_fds + 5, 2, NULL);
-        build_rcv_fd(AF_INET6, SOCK_STREAM, rcv_fds + 7, 2, NULL);
-        test(rcv_fds, 9, AF_INET, SOCK_STREAM, rcv_fds[4]);
+        build_rcv_fd(AF_INET, proto, rcv_fds, 2, NULL);
+        build_rcv_fd(AF_INET6, proto, rcv_fds + 2, 2, NULL);
+        build_rcv_fd(fam_rcv, proto, rcv_fds + 4, 1, addr_str);
+        build_rcv_fd(AF_INET, proto, rcv_fds + 5, 2, NULL);
+        build_rcv_fd(AF_INET6, proto, rcv_fds + 7, 2, NULL);
+        test(rcv_fds, 9, fam_send, proto, rcv_fds[4]);
         for (i = 0; i < 9; ++i)
                 close(rcv_fds[i]);
+        fprintf(stderr, "pass\n");
+}
 
-        fprintf(stderr, "---- TCP IPv6 ----\n");
-        build_rcv_fd(AF_INET, SOCK_STREAM, rcv_fds, 2, NULL);
-        build_rcv_fd(AF_INET6, SOCK_STREAM, rcv_fds + 2, 2, NULL);
-        build_rcv_fd(AF_INET6, SOCK_STREAM, rcv_fds + 4, 1, IP6_ADDR);
-        build_rcv_fd(AF_INET, SOCK_STREAM, rcv_fds + 5, 2, NULL);
-        build_rcv_fd(AF_INET6, SOCK_STREAM, rcv_fds + 7, 2, NULL);
-        test(rcv_fds, 9, AF_INET6, SOCK_STREAM, rcv_fds[4]);
-        for (i = 0; i < 9; ++i)
-                close(rcv_fds[i]);
+static void test_proto(int proto, const char *proto_str)
+{
+        if (proto == SOCK_DCCP) {
+                int test_fd;
+
+                test_fd = socket(AF_INET, proto, 0);
+                if (test_fd < 0) {
+                        if (errno == ESOCKTNOSUPPORT) {
+                                fprintf(stderr, "DCCP not supported: skipping DCCP tests\n");
+                                return;
+                        } else
+                                error(1, errno, "failed to create a DCCP socket");
+                }
+                close(test_fd);
+        }
 
-        fprintf(stderr, "---- TCP IPv4 mapped to IPv6 ----\n");
-        build_rcv_fd(AF_INET, SOCK_STREAM, rcv_fds, 2, NULL);
-        build_rcv_fd(AF_INET6, SOCK_STREAM, rcv_fds + 2, 2, NULL);
-        build_rcv_fd(AF_INET6, SOCK_STREAM, rcv_fds + 4, 1, IP4_MAPPED6);
-        build_rcv_fd(AF_INET, SOCK_STREAM, rcv_fds + 5, 2, NULL);
-        build_rcv_fd(AF_INET6, SOCK_STREAM, rcv_fds + 7, 2, NULL);
-        test(rcv_fds, 9, AF_INET, SOCK_STREAM, rcv_fds[4]);
-        for (i = 0; i < 9; ++i)
-                close(rcv_fds[i]);
+        fprintf(stderr, "%s IPv4 ... ", proto_str);
+        run_one_test(AF_INET, AF_INET, proto, IP4_ADDR);
 
-        fprintf(stderr, "---- DCCP IPv4 ----\n");
-        build_rcv_fd(AF_INET, SOCK_DCCP, rcv_fds, 2, NULL);
-        build_rcv_fd(AF_INET6, SOCK_DCCP, rcv_fds + 2, 2, NULL);
-        build_rcv_fd(AF_INET, SOCK_DCCP, rcv_fds + 4, 1, IP4_ADDR);
-        build_rcv_fd(AF_INET, SOCK_DCCP, rcv_fds + 5, 2, NULL);
-        build_rcv_fd(AF_INET6, SOCK_DCCP, rcv_fds + 7, 2, NULL);
-        test(rcv_fds, 9, AF_INET, SOCK_DCCP, rcv_fds[4]);
-        for (i = 0; i < 9; ++i)
-                close(rcv_fds[i]);
+        fprintf(stderr, "%s IPv6 ... ", proto_str);
+        run_one_test(AF_INET6, AF_INET6, proto, IP6_ADDR);
 
-        fprintf(stderr, "---- DCCP IPv6 ----\n");
-        build_rcv_fd(AF_INET, SOCK_DCCP, rcv_fds, 2, NULL);
-        build_rcv_fd(AF_INET6, SOCK_DCCP, rcv_fds + 2, 2, NULL);
-        build_rcv_fd(AF_INET6, SOCK_DCCP, rcv_fds + 4, 1, IP6_ADDR);
-        build_rcv_fd(AF_INET, SOCK_DCCP, rcv_fds + 5, 2, NULL);
-        build_rcv_fd(AF_INET6, SOCK_DCCP, rcv_fds + 7, 2, NULL);
-        test(rcv_fds, 9, AF_INET6, SOCK_DCCP, rcv_fds[4]);
-        for (i = 0; i < 9; ++i)
-                close(rcv_fds[i]);
+        fprintf(stderr, "%s IPv4 mapped to IPv6 ... ", proto_str);
+        run_one_test(AF_INET, AF_INET6, proto, IP4_MAPPED6);
+}
 
-        fprintf(stderr, "---- DCCP IPv4 mapped to IPv6 ----\n");
-        build_rcv_fd(AF_INET, SOCK_DCCP, rcv_fds, 2, NULL);
-        build_rcv_fd(AF_INET6, SOCK_DCCP, rcv_fds + 2, 2, NULL);
-        build_rcv_fd(AF_INET6, SOCK_DCCP, rcv_fds + 4, 1, IP4_MAPPED6);
-        build_rcv_fd(AF_INET, SOCK_DCCP, rcv_fds + 5, 2, NULL);
-        build_rcv_fd(AF_INET6, SOCK_DCCP, rcv_fds + 7, 2, NULL);
-        test(rcv_fds, 9, AF_INET, SOCK_DCCP, rcv_fds[4]);
-        for (i = 0; i < 9; ++i)
-                close(rcv_fds[i]);
+int main(void)
+{
+        test_proto(SOCK_DGRAM, "UDP");
+        test_proto(SOCK_STREAM, "TCP");
+        test_proto(SOCK_DCCP, "DCCP");
 
         fprintf(stderr, "SUCCESS\n");
         return 0;