17b93fadfSCorey Bryant /* 27b93fadfSCorey Bryant * QEMU Bridge Helper 37b93fadfSCorey Bryant * 47b93fadfSCorey Bryant * Copyright IBM, Corp. 2011 57b93fadfSCorey Bryant * 67b93fadfSCorey Bryant * Authors: 77b93fadfSCorey Bryant * Anthony Liguori <aliguori@us.ibm.com> 87b93fadfSCorey Bryant * Richa Marwaha <rmarwah@linux.vnet.ibm.com> 97b93fadfSCorey Bryant * Corey Bryant <coreyb@linux.vnet.ibm.com> 107b93fadfSCorey Bryant * 117b93fadfSCorey Bryant * This work is licensed under the terms of the GNU GPL, version 2. See 127b93fadfSCorey Bryant * the COPYING file in the top-level directory. 137b93fadfSCorey Bryant * 147b93fadfSCorey Bryant */ 157b93fadfSCorey Bryant 16d38ea87aSPeter Maydell #include "qemu/osdep.h" 177b93fadfSCorey Bryant 187b93fadfSCorey Bryant 197b93fadfSCorey Bryant #include <sys/ioctl.h> 207b93fadfSCorey Bryant #include <sys/socket.h> 217b93fadfSCorey Bryant #include <sys/un.h> 227b93fadfSCorey Bryant #include <sys/prctl.h> 237b93fadfSCorey Bryant 247b93fadfSCorey Bryant #include <net/if.h> 257b93fadfSCorey Bryant 267b93fadfSCorey Bryant #include <linux/sockios.h> 277b93fadfSCorey Bryant 2834309d2bSCorey Bryant #ifndef SIOCBRADDIF 2934309d2bSCorey Bryant #include <linux/if_bridge.h> 3034309d2bSCorey Bryant #endif 3134309d2bSCorey Bryant 321de7afc9SPaolo Bonzini #include "qemu/queue.h" 33bdef79a2SCorey Bryant 347b93fadfSCorey Bryant #include "net/tap-linux.h" 357b93fadfSCorey Bryant 3647e98658SCorey Bryant #ifdef CONFIG_LIBCAP 3747e98658SCorey Bryant #include <cap-ng.h> 3847e98658SCorey Bryant #endif 3947e98658SCorey Bryant 40bdef79a2SCorey Bryant #define DEFAULT_ACL_FILE CONFIG_QEMU_CONFDIR "/bridge.conf" 41bdef79a2SCorey Bryant 42bdef79a2SCorey Bryant enum { 43bdef79a2SCorey Bryant ACL_ALLOW = 0, 44bdef79a2SCorey Bryant ACL_ALLOW_ALL, 45bdef79a2SCorey Bryant ACL_DENY, 46bdef79a2SCorey Bryant ACL_DENY_ALL, 47bdef79a2SCorey Bryant }; 48bdef79a2SCorey Bryant 49bdef79a2SCorey Bryant typedef struct ACLRule { 50bdef79a2SCorey Bryant int type; 51bdef79a2SCorey Bryant char iface[IFNAMSIZ]; 52bdef79a2SCorey Bryant QSIMPLEQ_ENTRY(ACLRule) entry; 53bdef79a2SCorey Bryant } ACLRule; 54bdef79a2SCorey Bryant 55bdef79a2SCorey Bryant typedef QSIMPLEQ_HEAD(ACLList, ACLRule) ACLList; 56bdef79a2SCorey Bryant 577b93fadfSCorey Bryant static void usage(void) 587b93fadfSCorey Bryant { 597b93fadfSCorey Bryant fprintf(stderr, 607b93fadfSCorey Bryant "Usage: qemu-bridge-helper [--use-vnet] --br=bridge --fd=unixfd\n"); 617b93fadfSCorey Bryant } 627b93fadfSCorey Bryant 63bdef79a2SCorey Bryant static int parse_acl_file(const char *filename, ACLList *acl_list) 64bdef79a2SCorey Bryant { 65bdef79a2SCorey Bryant FILE *f; 66bdef79a2SCorey Bryant char line[4096]; 67bdef79a2SCorey Bryant ACLRule *acl_rule; 68bdef79a2SCorey Bryant 69bdef79a2SCorey Bryant f = fopen(filename, "r"); 70bdef79a2SCorey Bryant if (f == NULL) { 71bdef79a2SCorey Bryant return -1; 72bdef79a2SCorey Bryant } 73bdef79a2SCorey Bryant 74bdef79a2SCorey Bryant while (fgets(line, sizeof(line), f) != NULL) { 75bdef79a2SCorey Bryant char *ptr = line; 76bdef79a2SCorey Bryant char *cmd, *arg, *argend; 77bdef79a2SCorey Bryant 78*b8c3511dSMarkus Armbruster while (g_ascii_isspace(*ptr)) { 79bdef79a2SCorey Bryant ptr++; 80bdef79a2SCorey Bryant } 81bdef79a2SCorey Bryant 82bdef79a2SCorey Bryant /* skip comments and empty lines */ 83bdef79a2SCorey Bryant if (*ptr == '#' || *ptr == 0) { 84bdef79a2SCorey Bryant continue; 85bdef79a2SCorey Bryant } 86bdef79a2SCorey Bryant 87bdef79a2SCorey Bryant cmd = ptr; 88bdef79a2SCorey Bryant arg = strchr(cmd, ' '); 89bdef79a2SCorey Bryant if (arg == NULL) { 90bdef79a2SCorey Bryant arg = strchr(cmd, '\t'); 91bdef79a2SCorey Bryant } 92bdef79a2SCorey Bryant 93bdef79a2SCorey Bryant if (arg == NULL) { 94bdef79a2SCorey Bryant fprintf(stderr, "Invalid config line:\n %s\n", line); 95bdef79a2SCorey Bryant fclose(f); 96bdef79a2SCorey Bryant errno = EINVAL; 97bdef79a2SCorey Bryant return -1; 98bdef79a2SCorey Bryant } 99bdef79a2SCorey Bryant 100bdef79a2SCorey Bryant *arg = 0; 101bdef79a2SCorey Bryant arg++; 102*b8c3511dSMarkus Armbruster while (g_ascii_isspace(*arg)) { 103bdef79a2SCorey Bryant arg++; 104bdef79a2SCorey Bryant } 105bdef79a2SCorey Bryant 106bdef79a2SCorey Bryant argend = arg + strlen(arg); 107*b8c3511dSMarkus Armbruster while (arg != argend && g_ascii_isspace(*(argend - 1))) { 108bdef79a2SCorey Bryant argend--; 109bdef79a2SCorey Bryant } 110bdef79a2SCorey Bryant *argend = 0; 111bdef79a2SCorey Bryant 112bdef79a2SCorey Bryant if (strcmp(cmd, "deny") == 0) { 113bdef79a2SCorey Bryant acl_rule = g_malloc(sizeof(*acl_rule)); 114bdef79a2SCorey Bryant if (strcmp(arg, "all") == 0) { 115bdef79a2SCorey Bryant acl_rule->type = ACL_DENY_ALL; 116bdef79a2SCorey Bryant } else { 117bdef79a2SCorey Bryant acl_rule->type = ACL_DENY; 118bdef79a2SCorey Bryant snprintf(acl_rule->iface, IFNAMSIZ, "%s", arg); 119bdef79a2SCorey Bryant } 120bdef79a2SCorey Bryant QSIMPLEQ_INSERT_TAIL(acl_list, acl_rule, entry); 121bdef79a2SCorey Bryant } else if (strcmp(cmd, "allow") == 0) { 122bdef79a2SCorey Bryant acl_rule = g_malloc(sizeof(*acl_rule)); 123bdef79a2SCorey Bryant if (strcmp(arg, "all") == 0) { 124bdef79a2SCorey Bryant acl_rule->type = ACL_ALLOW_ALL; 125bdef79a2SCorey Bryant } else { 126bdef79a2SCorey Bryant acl_rule->type = ACL_ALLOW; 127bdef79a2SCorey Bryant snprintf(acl_rule->iface, IFNAMSIZ, "%s", arg); 128bdef79a2SCorey Bryant } 129bdef79a2SCorey Bryant QSIMPLEQ_INSERT_TAIL(acl_list, acl_rule, entry); 130bdef79a2SCorey Bryant } else if (strcmp(cmd, "include") == 0) { 131bdef79a2SCorey Bryant /* ignore errors */ 132bdef79a2SCorey Bryant parse_acl_file(arg, acl_list); 133bdef79a2SCorey Bryant } else { 134bdef79a2SCorey Bryant fprintf(stderr, "Unknown command `%s'\n", cmd); 135bdef79a2SCorey Bryant fclose(f); 136bdef79a2SCorey Bryant errno = EINVAL; 137bdef79a2SCorey Bryant return -1; 138bdef79a2SCorey Bryant } 139bdef79a2SCorey Bryant } 140bdef79a2SCorey Bryant 141bdef79a2SCorey Bryant fclose(f); 142bdef79a2SCorey Bryant 143bdef79a2SCorey Bryant return 0; 144bdef79a2SCorey Bryant } 145bdef79a2SCorey Bryant 1467b93fadfSCorey Bryant static bool has_vnet_hdr(int fd) 1477b93fadfSCorey Bryant { 1487b93fadfSCorey Bryant unsigned int features = 0; 1497b93fadfSCorey Bryant 1507b93fadfSCorey Bryant if (ioctl(fd, TUNGETFEATURES, &features) == -1) { 1517b93fadfSCorey Bryant return false; 1527b93fadfSCorey Bryant } 1537b93fadfSCorey Bryant 1547b93fadfSCorey Bryant if (!(features & IFF_VNET_HDR)) { 1557b93fadfSCorey Bryant return false; 1567b93fadfSCorey Bryant } 1577b93fadfSCorey Bryant 1587b93fadfSCorey Bryant return true; 1597b93fadfSCorey Bryant } 1607b93fadfSCorey Bryant 1617b93fadfSCorey Bryant static void prep_ifreq(struct ifreq *ifr, const char *ifname) 1627b93fadfSCorey Bryant { 1637b93fadfSCorey Bryant memset(ifr, 0, sizeof(*ifr)); 1647b93fadfSCorey Bryant snprintf(ifr->ifr_name, IFNAMSIZ, "%s", ifname); 1657b93fadfSCorey Bryant } 1667b93fadfSCorey Bryant 1677b93fadfSCorey Bryant static int send_fd(int c, int fd) 1687b93fadfSCorey Bryant { 1697b93fadfSCorey Bryant char msgbuf[CMSG_SPACE(sizeof(fd))]; 1707b93fadfSCorey Bryant struct msghdr msg = { 1717b93fadfSCorey Bryant .msg_control = msgbuf, 1727b93fadfSCorey Bryant .msg_controllen = sizeof(msgbuf), 1737b93fadfSCorey Bryant }; 1747b93fadfSCorey Bryant struct cmsghdr *cmsg; 1757b93fadfSCorey Bryant struct iovec iov; 1767b93fadfSCorey Bryant char req[1] = { 0x00 }; 1777b93fadfSCorey Bryant 1787b93fadfSCorey Bryant cmsg = CMSG_FIRSTHDR(&msg); 1797b93fadfSCorey Bryant cmsg->cmsg_level = SOL_SOCKET; 1807b93fadfSCorey Bryant cmsg->cmsg_type = SCM_RIGHTS; 1817b93fadfSCorey Bryant cmsg->cmsg_len = CMSG_LEN(sizeof(fd)); 1827b93fadfSCorey Bryant msg.msg_controllen = cmsg->cmsg_len; 1837b93fadfSCorey Bryant 1847b93fadfSCorey Bryant iov.iov_base = req; 1857b93fadfSCorey Bryant iov.iov_len = sizeof(req); 1867b93fadfSCorey Bryant 1877b93fadfSCorey Bryant msg.msg_iov = &iov; 1887b93fadfSCorey Bryant msg.msg_iovlen = 1; 1897b93fadfSCorey Bryant memcpy(CMSG_DATA(cmsg), &fd, sizeof(fd)); 1907b93fadfSCorey Bryant 1917b93fadfSCorey Bryant return sendmsg(c, &msg, 0); 1927b93fadfSCorey Bryant } 1937b93fadfSCorey Bryant 19447e98658SCorey Bryant #ifdef CONFIG_LIBCAP 19547e98658SCorey Bryant static int drop_privileges(void) 19647e98658SCorey Bryant { 19747e98658SCorey Bryant /* clear all capabilities */ 19847e98658SCorey Bryant capng_clear(CAPNG_SELECT_BOTH); 19947e98658SCorey Bryant 20047e98658SCorey Bryant if (capng_update(CAPNG_ADD, CAPNG_EFFECTIVE | CAPNG_PERMITTED, 20147e98658SCorey Bryant CAP_NET_ADMIN) < 0) { 20247e98658SCorey Bryant return -1; 20347e98658SCorey Bryant } 20447e98658SCorey Bryant 20547e98658SCorey Bryant /* change to calling user's real uid and gid, retaining supplemental 20647e98658SCorey Bryant * groups and CAP_NET_ADMIN */ 20747e98658SCorey Bryant if (capng_change_id(getuid(), getgid(), CAPNG_CLEAR_BOUNDING)) { 20847e98658SCorey Bryant return -1; 20947e98658SCorey Bryant } 21047e98658SCorey Bryant 21147e98658SCorey Bryant return 0; 21247e98658SCorey Bryant } 21347e98658SCorey Bryant #endif 21447e98658SCorey Bryant 2157b93fadfSCorey Bryant int main(int argc, char **argv) 2167b93fadfSCorey Bryant { 2177b93fadfSCorey Bryant struct ifreq ifr; 21834309d2bSCorey Bryant #ifndef SIOCBRADDIF 21934309d2bSCorey Bryant unsigned long ifargs[4]; 22034309d2bSCorey Bryant #endif 22134309d2bSCorey Bryant int ifindex; 222eb3f45c5SGonglei int fd = -1, ctlfd = -1, unixfd = -1; 2237b93fadfSCorey Bryant int use_vnet = 0; 2247b93fadfSCorey Bryant int mtu; 2257b93fadfSCorey Bryant const char *bridge = NULL; 2267b93fadfSCorey Bryant char iface[IFNAMSIZ]; 2277b93fadfSCorey Bryant int index; 228bdef79a2SCorey Bryant ACLRule *acl_rule; 229bdef79a2SCorey Bryant ACLList acl_list; 230bdef79a2SCorey Bryant int access_allowed, access_denied; 2317b93fadfSCorey Bryant int ret = EXIT_SUCCESS; 2327b93fadfSCorey Bryant 23347e98658SCorey Bryant #ifdef CONFIG_LIBCAP 23447e98658SCorey Bryant /* if we're run from an suid binary, immediately drop privileges preserving 23547e98658SCorey Bryant * cap_net_admin */ 23647e98658SCorey Bryant if (geteuid() == 0 && getuid() != geteuid()) { 23747e98658SCorey Bryant if (drop_privileges() == -1) { 23847e98658SCorey Bryant fprintf(stderr, "failed to drop privileges\n"); 23947e98658SCorey Bryant return 1; 24047e98658SCorey Bryant } 24147e98658SCorey Bryant } 24247e98658SCorey Bryant #endif 24347e98658SCorey Bryant 2447b93fadfSCorey Bryant /* parse arguments */ 2457b93fadfSCorey Bryant for (index = 1; index < argc; index++) { 2467b93fadfSCorey Bryant if (strcmp(argv[index], "--use-vnet") == 0) { 2477b93fadfSCorey Bryant use_vnet = 1; 2487b93fadfSCorey Bryant } else if (strncmp(argv[index], "--br=", 5) == 0) { 2497b93fadfSCorey Bryant bridge = &argv[index][5]; 2507b93fadfSCorey Bryant } else if (strncmp(argv[index], "--fd=", 5) == 0) { 2517b93fadfSCorey Bryant unixfd = atoi(&argv[index][5]); 2527b93fadfSCorey Bryant } else { 2537b93fadfSCorey Bryant usage(); 2547b93fadfSCorey Bryant return EXIT_FAILURE; 2557b93fadfSCorey Bryant } 2567b93fadfSCorey Bryant } 2577b93fadfSCorey Bryant 2587b93fadfSCorey Bryant if (bridge == NULL || unixfd == -1) { 2597b93fadfSCorey Bryant usage(); 2607b93fadfSCorey Bryant return EXIT_FAILURE; 2617b93fadfSCorey Bryant } 2627b93fadfSCorey Bryant 263bdef79a2SCorey Bryant /* parse default acl file */ 264bdef79a2SCorey Bryant QSIMPLEQ_INIT(&acl_list); 265bdef79a2SCorey Bryant if (parse_acl_file(DEFAULT_ACL_FILE, &acl_list) == -1) { 266bdef79a2SCorey Bryant fprintf(stderr, "failed to parse default acl file `%s'\n", 267bdef79a2SCorey Bryant DEFAULT_ACL_FILE); 268bdef79a2SCorey Bryant ret = EXIT_FAILURE; 269bdef79a2SCorey Bryant goto cleanup; 270bdef79a2SCorey Bryant } 271bdef79a2SCorey Bryant 272bdef79a2SCorey Bryant /* validate bridge against acl -- default policy is to deny 273bdef79a2SCorey Bryant * according acl policy if we have a deny and allow both 274bdef79a2SCorey Bryant * then deny should always win over allow 275bdef79a2SCorey Bryant */ 276bdef79a2SCorey Bryant access_allowed = 0; 277bdef79a2SCorey Bryant access_denied = 0; 278bdef79a2SCorey Bryant QSIMPLEQ_FOREACH(acl_rule, &acl_list, entry) { 279bdef79a2SCorey Bryant switch (acl_rule->type) { 280bdef79a2SCorey Bryant case ACL_ALLOW_ALL: 281bdef79a2SCorey Bryant access_allowed = 1; 282bdef79a2SCorey Bryant break; 283bdef79a2SCorey Bryant case ACL_ALLOW: 284bdef79a2SCorey Bryant if (strcmp(bridge, acl_rule->iface) == 0) { 285bdef79a2SCorey Bryant access_allowed = 1; 286bdef79a2SCorey Bryant } 287bdef79a2SCorey Bryant break; 288bdef79a2SCorey Bryant case ACL_DENY_ALL: 289bdef79a2SCorey Bryant access_denied = 1; 290bdef79a2SCorey Bryant break; 291bdef79a2SCorey Bryant case ACL_DENY: 292bdef79a2SCorey Bryant if (strcmp(bridge, acl_rule->iface) == 0) { 293bdef79a2SCorey Bryant access_denied = 1; 294bdef79a2SCorey Bryant } 295bdef79a2SCorey Bryant break; 296bdef79a2SCorey Bryant } 297bdef79a2SCorey Bryant } 298bdef79a2SCorey Bryant 299bdef79a2SCorey Bryant if ((access_allowed == 0) || (access_denied == 1)) { 300bdef79a2SCorey Bryant fprintf(stderr, "access denied by acl file\n"); 301bdef79a2SCorey Bryant ret = EXIT_FAILURE; 302bdef79a2SCorey Bryant goto cleanup; 303bdef79a2SCorey Bryant } 304bdef79a2SCorey Bryant 3057b93fadfSCorey Bryant /* open a socket to use to control the network interfaces */ 3067b93fadfSCorey Bryant ctlfd = socket(AF_INET, SOCK_STREAM, 0); 3077b93fadfSCorey Bryant if (ctlfd == -1) { 3087b93fadfSCorey Bryant fprintf(stderr, "failed to open control socket: %s\n", strerror(errno)); 3097b93fadfSCorey Bryant ret = EXIT_FAILURE; 3107b93fadfSCorey Bryant goto cleanup; 3117b93fadfSCorey Bryant } 3127b93fadfSCorey Bryant 3137b93fadfSCorey Bryant /* open the tap device */ 3147b93fadfSCorey Bryant fd = open("/dev/net/tun", O_RDWR); 3157b93fadfSCorey Bryant if (fd == -1) { 3167b93fadfSCorey Bryant fprintf(stderr, "failed to open /dev/net/tun: %s\n", strerror(errno)); 3177b93fadfSCorey Bryant ret = EXIT_FAILURE; 3187b93fadfSCorey Bryant goto cleanup; 3197b93fadfSCorey Bryant } 3207b93fadfSCorey Bryant 3217b93fadfSCorey Bryant /* request a tap device, disable PI, and add vnet header support if 3227b93fadfSCorey Bryant * requested and it's available. */ 3237b93fadfSCorey Bryant prep_ifreq(&ifr, "tap%d"); 3247b93fadfSCorey Bryant ifr.ifr_flags = IFF_TAP|IFF_NO_PI; 3257b93fadfSCorey Bryant if (use_vnet && has_vnet_hdr(fd)) { 3267b93fadfSCorey Bryant ifr.ifr_flags |= IFF_VNET_HDR; 3277b93fadfSCorey Bryant } 3287b93fadfSCorey Bryant 3297b93fadfSCorey Bryant if (ioctl(fd, TUNSETIFF, &ifr) == -1) { 3307b93fadfSCorey Bryant fprintf(stderr, "failed to create tun device: %s\n", strerror(errno)); 3317b93fadfSCorey Bryant ret = EXIT_FAILURE; 3327b93fadfSCorey Bryant goto cleanup; 3337b93fadfSCorey Bryant } 3347b93fadfSCorey Bryant 3357b93fadfSCorey Bryant /* save tap device name */ 3367b93fadfSCorey Bryant snprintf(iface, sizeof(iface), "%s", ifr.ifr_name); 3377b93fadfSCorey Bryant 3387b93fadfSCorey Bryant /* get the mtu of the bridge */ 3397b93fadfSCorey Bryant prep_ifreq(&ifr, bridge); 3407b93fadfSCorey Bryant if (ioctl(ctlfd, SIOCGIFMTU, &ifr) == -1) { 3417b93fadfSCorey Bryant fprintf(stderr, "failed to get mtu of bridge `%s': %s\n", 3427b93fadfSCorey Bryant bridge, strerror(errno)); 3437b93fadfSCorey Bryant ret = EXIT_FAILURE; 3447b93fadfSCorey Bryant goto cleanup; 3457b93fadfSCorey Bryant } 3467b93fadfSCorey Bryant 3477b93fadfSCorey Bryant /* save mtu */ 3487b93fadfSCorey Bryant mtu = ifr.ifr_mtu; 3497b93fadfSCorey Bryant 3507b93fadfSCorey Bryant /* set the mtu of the interface based on the bridge */ 3517b93fadfSCorey Bryant prep_ifreq(&ifr, iface); 3527b93fadfSCorey Bryant ifr.ifr_mtu = mtu; 3537b93fadfSCorey Bryant if (ioctl(ctlfd, SIOCSIFMTU, &ifr) == -1) { 3547b93fadfSCorey Bryant fprintf(stderr, "failed to set mtu of device `%s' to %d: %s\n", 3557b93fadfSCorey Bryant iface, mtu, strerror(errno)); 3567b93fadfSCorey Bryant ret = EXIT_FAILURE; 3577b93fadfSCorey Bryant goto cleanup; 3587b93fadfSCorey Bryant } 3597b93fadfSCorey Bryant 360226ecabfSPaolo Bonzini /* Linux uses the lowest enslaved MAC address as the MAC address of 361226ecabfSPaolo Bonzini * the bridge. Set MAC address to a high value so that it doesn't 362226ecabfSPaolo Bonzini * affect the MAC address of the bridge. 363226ecabfSPaolo Bonzini */ 364226ecabfSPaolo Bonzini if (ioctl(ctlfd, SIOCGIFHWADDR, &ifr) < 0) { 365226ecabfSPaolo Bonzini fprintf(stderr, "failed to get MAC address of device `%s': %s\n", 366226ecabfSPaolo Bonzini iface, strerror(errno)); 367226ecabfSPaolo Bonzini ret = EXIT_FAILURE; 368226ecabfSPaolo Bonzini goto cleanup; 369226ecabfSPaolo Bonzini } 370226ecabfSPaolo Bonzini ifr.ifr_hwaddr.sa_data[0] = 0xFE; 371226ecabfSPaolo Bonzini if (ioctl(ctlfd, SIOCSIFHWADDR, &ifr) < 0) { 372226ecabfSPaolo Bonzini fprintf(stderr, "failed to set MAC address of device `%s': %s\n", 373226ecabfSPaolo Bonzini iface, strerror(errno)); 374226ecabfSPaolo Bonzini ret = EXIT_FAILURE; 375226ecabfSPaolo Bonzini goto cleanup; 376226ecabfSPaolo Bonzini } 377226ecabfSPaolo Bonzini 3787b93fadfSCorey Bryant /* add the interface to the bridge */ 3797b93fadfSCorey Bryant prep_ifreq(&ifr, bridge); 38034309d2bSCorey Bryant ifindex = if_nametoindex(iface); 38134309d2bSCorey Bryant #ifndef SIOCBRADDIF 38234309d2bSCorey Bryant ifargs[0] = BRCTL_ADD_IF; 38334309d2bSCorey Bryant ifargs[1] = ifindex; 38434309d2bSCorey Bryant ifargs[2] = 0; 38534309d2bSCorey Bryant ifargs[3] = 0; 38634309d2bSCorey Bryant ifr.ifr_data = (void *)ifargs; 38734309d2bSCorey Bryant ret = ioctl(ctlfd, SIOCDEVPRIVATE, &ifr); 38834309d2bSCorey Bryant #else 38934309d2bSCorey Bryant ifr.ifr_ifindex = ifindex; 39034309d2bSCorey Bryant ret = ioctl(ctlfd, SIOCBRADDIF, &ifr); 39134309d2bSCorey Bryant #endif 39234309d2bSCorey Bryant if (ret == -1) { 3937b93fadfSCorey Bryant fprintf(stderr, "failed to add interface `%s' to bridge `%s': %s\n", 3947b93fadfSCorey Bryant iface, bridge, strerror(errno)); 3957b93fadfSCorey Bryant ret = EXIT_FAILURE; 3967b93fadfSCorey Bryant goto cleanup; 3977b93fadfSCorey Bryant } 3987b93fadfSCorey Bryant 3997b93fadfSCorey Bryant /* bring the interface up */ 4007b93fadfSCorey Bryant prep_ifreq(&ifr, iface); 4017b93fadfSCorey Bryant if (ioctl(ctlfd, SIOCGIFFLAGS, &ifr) == -1) { 4027b93fadfSCorey Bryant fprintf(stderr, "failed to get interface flags for `%s': %s\n", 4037b93fadfSCorey Bryant iface, strerror(errno)); 4047b93fadfSCorey Bryant ret = EXIT_FAILURE; 4057b93fadfSCorey Bryant goto cleanup; 4067b93fadfSCorey Bryant } 4077b93fadfSCorey Bryant 4087b93fadfSCorey Bryant ifr.ifr_flags |= IFF_UP; 4097b93fadfSCorey Bryant if (ioctl(ctlfd, SIOCSIFFLAGS, &ifr) == -1) { 4107b93fadfSCorey Bryant fprintf(stderr, "failed to bring up interface `%s': %s\n", 4117b93fadfSCorey Bryant iface, strerror(errno)); 4127b93fadfSCorey Bryant ret = EXIT_FAILURE; 4137b93fadfSCorey Bryant goto cleanup; 4147b93fadfSCorey Bryant } 4157b93fadfSCorey Bryant 4167b93fadfSCorey Bryant /* write fd to the domain socket */ 4177b93fadfSCorey Bryant if (send_fd(unixfd, fd) == -1) { 4187b93fadfSCorey Bryant fprintf(stderr, "failed to write fd to unix socket: %s\n", 4197b93fadfSCorey Bryant strerror(errno)); 4207b93fadfSCorey Bryant ret = EXIT_FAILURE; 4217b93fadfSCorey Bryant goto cleanup; 4227b93fadfSCorey Bryant } 4237b93fadfSCorey Bryant 4247b93fadfSCorey Bryant /* ... */ 4257b93fadfSCorey Bryant 4267b93fadfSCorey Bryant /* profit! */ 4277b93fadfSCorey Bryant 4287b93fadfSCorey Bryant cleanup: 429eb3f45c5SGonglei if (fd >= 0) { 430eb3f45c5SGonglei close(fd); 431eb3f45c5SGonglei } 432eb3f45c5SGonglei if (ctlfd >= 0) { 433eb3f45c5SGonglei close(ctlfd); 434eb3f45c5SGonglei } 435bdef79a2SCorey Bryant while ((acl_rule = QSIMPLEQ_FIRST(&acl_list)) != NULL) { 436bdef79a2SCorey Bryant QSIMPLEQ_REMOVE_HEAD(&acl_list, entry); 437bdef79a2SCorey Bryant g_free(acl_rule); 438bdef79a2SCorey Bryant } 439bdef79a2SCorey Bryant 4407b93fadfSCorey Bryant return ret; 4417b93fadfSCorey Bryant } 442