wireless support

1 files changed, 31 insertions, 7 deletions

diff --git a/src/fnet/main.c b/src/fnet/main.c
index 3832cfaef..5be15bc75 100644
--- a/src/fnet/main.c
+++ b/src/fnet/main.c
@@ -90,14 +90,38 @@ printf("\n");
         }
         else if (argc == 6 && strcmp(argv[1], "create") == 0 && strcmp(argv[2], "macvlan") == 0) {
                 // use ipvlan for wireless devices
-                struct stat s;
-                char *fname;
-                if (asprintf(&fname, "/sys/class/net/%s/wireless", argv[4]) == -1)
-                        errExit("asprintf");
-                if (stat(fname, &s) == 0) // wireless
-                        net_create_ipvlan(argv[3], argv[4], atoi(argv[5]));
-                else // regular ethernet
+                // ipvlan driver was introduced in Linux kernel 3.19
+                // detect both compile time and run time
+#ifndef IPVLAN_MODE_L2  // compile time
+                net_create_macvlan(argv[3], argv[4], atoi(argv[5]));
+#else
+                // check kernel version
+                struct utsname u;
+                int rv = uname(&u);
+                if (rv != 0)
+                        errExit("uname");
+                int major;
+                int minor;
+                if (2 != sscanf(u.release, "%d.%d", &major, &minor)) {
+                        fprintf(stderr, "Error fnet: cannot extract Linux kernel version: %s\n", u.version);
+                        exit(1);
+                }
+
+                if (arg_debug)
+                        printf("Linux kernel version %d.%d\n", major, minor);
+                if (major <= 3 && minor < 18)
                         net_create_macvlan(argv[3], argv[4], atoi(argv[5]));
+                else {
+                        struct stat s;
+                        char *fname;
+                        if (asprintf(&fname, "/sys/class/net/%s/wireless", argv[4]) == -1)
+                                errExit("asprintf");
+                        if (stat(fname, &s) == 0) // wireless
+                                net_create_ipvlan(argv[3], argv[4], atoi(argv[5]));
+                        else // regular ethernet
+                                net_create_macvlan(argv[3], argv[4], atoi(argv[5]));
+                }
+#endif
         }
         else if (argc == 7 && strcmp(argv[1], "config") == 0 && strcmp(argv[2], "interface") == 0) {
                 char *dev = argv[3];