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 167b93fadfSCorey Bryant #include "config-host.h" 177b93fadfSCorey Bryant 187b93fadfSCorey Bryant #include <stdio.h> 197b93fadfSCorey Bryant #include <errno.h> 207b93fadfSCorey Bryant #include <fcntl.h> 217b93fadfSCorey Bryant #include <unistd.h> 227b93fadfSCorey Bryant #include <string.h> 237b93fadfSCorey Bryant #include <stdlib.h> 247b93fadfSCorey Bryant #include <stdbool.h> 257b93fadfSCorey Bryant #include <ctype.h> 26bdef79a2SCorey Bryant #include <glib.h> 277b93fadfSCorey Bryant 287b93fadfSCorey Bryant #include <sys/types.h> 297b93fadfSCorey Bryant #include <sys/ioctl.h> 307b93fadfSCorey Bryant #include <sys/socket.h> 317b93fadfSCorey Bryant #include <sys/un.h> 327b93fadfSCorey Bryant #include <sys/prctl.h> 337b93fadfSCorey Bryant 347b93fadfSCorey Bryant #include <net/if.h> 357b93fadfSCorey Bryant 367b93fadfSCorey Bryant #include <linux/sockios.h> 377b93fadfSCorey Bryant 38*34309d2bSCorey Bryant #ifndef SIOCBRADDIF 39*34309d2bSCorey Bryant #include <linux/if_bridge.h> 40*34309d2bSCorey Bryant #endif 41*34309d2bSCorey Bryant 42bdef79a2SCorey Bryant #include "qemu-queue.h" 43bdef79a2SCorey Bryant 447b93fadfSCorey Bryant #include "net/tap-linux.h" 457b93fadfSCorey Bryant 4647e98658SCorey Bryant #ifdef CONFIG_LIBCAP 4747e98658SCorey Bryant #include <cap-ng.h> 4847e98658SCorey Bryant #endif 4947e98658SCorey Bryant 50bdef79a2SCorey Bryant #define DEFAULT_ACL_FILE CONFIG_QEMU_CONFDIR "/bridge.conf" 51bdef79a2SCorey Bryant 52bdef79a2SCorey Bryant enum { 53bdef79a2SCorey Bryant ACL_ALLOW = 0, 54bdef79a2SCorey Bryant ACL_ALLOW_ALL, 55bdef79a2SCorey Bryant ACL_DENY, 56bdef79a2SCorey Bryant ACL_DENY_ALL, 57bdef79a2SCorey Bryant }; 58bdef79a2SCorey Bryant 59bdef79a2SCorey Bryant typedef struct ACLRule { 60bdef79a2SCorey Bryant int type; 61bdef79a2SCorey Bryant char iface[IFNAMSIZ]; 62bdef79a2SCorey Bryant QSIMPLEQ_ENTRY(ACLRule) entry; 63bdef79a2SCorey Bryant } ACLRule; 64bdef79a2SCorey Bryant 65bdef79a2SCorey Bryant typedef QSIMPLEQ_HEAD(ACLList, ACLRule) ACLList; 66bdef79a2SCorey Bryant 677b93fadfSCorey Bryant static void usage(void) 687b93fadfSCorey Bryant { 697b93fadfSCorey Bryant fprintf(stderr, 707b93fadfSCorey Bryant "Usage: qemu-bridge-helper [--use-vnet] --br=bridge --fd=unixfd\n"); 717b93fadfSCorey Bryant } 727b93fadfSCorey Bryant 73bdef79a2SCorey Bryant static int parse_acl_file(const char *filename, ACLList *acl_list) 74bdef79a2SCorey Bryant { 75bdef79a2SCorey Bryant FILE *f; 76bdef79a2SCorey Bryant char line[4096]; 77bdef79a2SCorey Bryant ACLRule *acl_rule; 78bdef79a2SCorey Bryant 79bdef79a2SCorey Bryant f = fopen(filename, "r"); 80bdef79a2SCorey Bryant if (f == NULL) { 81bdef79a2SCorey Bryant return -1; 82bdef79a2SCorey Bryant } 83bdef79a2SCorey Bryant 84bdef79a2SCorey Bryant while (fgets(line, sizeof(line), f) != NULL) { 85bdef79a2SCorey Bryant char *ptr = line; 86bdef79a2SCorey Bryant char *cmd, *arg, *argend; 87bdef79a2SCorey Bryant 88bdef79a2SCorey Bryant while (isspace(*ptr)) { 89bdef79a2SCorey Bryant ptr++; 90bdef79a2SCorey Bryant } 91bdef79a2SCorey Bryant 92bdef79a2SCorey Bryant /* skip comments and empty lines */ 93bdef79a2SCorey Bryant if (*ptr == '#' || *ptr == 0) { 94bdef79a2SCorey Bryant continue; 95bdef79a2SCorey Bryant } 96bdef79a2SCorey Bryant 97bdef79a2SCorey Bryant cmd = ptr; 98bdef79a2SCorey Bryant arg = strchr(cmd, ' '); 99bdef79a2SCorey Bryant if (arg == NULL) { 100bdef79a2SCorey Bryant arg = strchr(cmd, '\t'); 101bdef79a2SCorey Bryant } 102bdef79a2SCorey Bryant 103bdef79a2SCorey Bryant if (arg == NULL) { 104bdef79a2SCorey Bryant fprintf(stderr, "Invalid config line:\n %s\n", line); 105bdef79a2SCorey Bryant fclose(f); 106bdef79a2SCorey Bryant errno = EINVAL; 107bdef79a2SCorey Bryant return -1; 108bdef79a2SCorey Bryant } 109bdef79a2SCorey Bryant 110bdef79a2SCorey Bryant *arg = 0; 111bdef79a2SCorey Bryant arg++; 112bdef79a2SCorey Bryant while (isspace(*arg)) { 113bdef79a2SCorey Bryant arg++; 114bdef79a2SCorey Bryant } 115bdef79a2SCorey Bryant 116bdef79a2SCorey Bryant argend = arg + strlen(arg); 117bdef79a2SCorey Bryant while (arg != argend && isspace(*(argend - 1))) { 118bdef79a2SCorey Bryant argend--; 119bdef79a2SCorey Bryant } 120bdef79a2SCorey Bryant *argend = 0; 121bdef79a2SCorey Bryant 122bdef79a2SCorey Bryant if (strcmp(cmd, "deny") == 0) { 123bdef79a2SCorey Bryant acl_rule = g_malloc(sizeof(*acl_rule)); 124bdef79a2SCorey Bryant if (strcmp(arg, "all") == 0) { 125bdef79a2SCorey Bryant acl_rule->type = ACL_DENY_ALL; 126bdef79a2SCorey Bryant } else { 127bdef79a2SCorey Bryant acl_rule->type = ACL_DENY; 128bdef79a2SCorey Bryant snprintf(acl_rule->iface, IFNAMSIZ, "%s", arg); 129bdef79a2SCorey Bryant } 130bdef79a2SCorey Bryant QSIMPLEQ_INSERT_TAIL(acl_list, acl_rule, entry); 131bdef79a2SCorey Bryant } else if (strcmp(cmd, "allow") == 0) { 132bdef79a2SCorey Bryant acl_rule = g_malloc(sizeof(*acl_rule)); 133bdef79a2SCorey Bryant if (strcmp(arg, "all") == 0) { 134bdef79a2SCorey Bryant acl_rule->type = ACL_ALLOW_ALL; 135bdef79a2SCorey Bryant } else { 136bdef79a2SCorey Bryant acl_rule->type = ACL_ALLOW; 137bdef79a2SCorey Bryant snprintf(acl_rule->iface, IFNAMSIZ, "%s", arg); 138bdef79a2SCorey Bryant } 139bdef79a2SCorey Bryant QSIMPLEQ_INSERT_TAIL(acl_list, acl_rule, entry); 140bdef79a2SCorey Bryant } else if (strcmp(cmd, "include") == 0) { 141bdef79a2SCorey Bryant /* ignore errors */ 142bdef79a2SCorey Bryant parse_acl_file(arg, acl_list); 143bdef79a2SCorey Bryant } else { 144bdef79a2SCorey Bryant fprintf(stderr, "Unknown command `%s'\n", cmd); 145bdef79a2SCorey Bryant fclose(f); 146bdef79a2SCorey Bryant errno = EINVAL; 147bdef79a2SCorey Bryant return -1; 148bdef79a2SCorey Bryant } 149bdef79a2SCorey Bryant } 150bdef79a2SCorey Bryant 151bdef79a2SCorey Bryant fclose(f); 152bdef79a2SCorey Bryant 153bdef79a2SCorey Bryant return 0; 154bdef79a2SCorey Bryant } 155bdef79a2SCorey Bryant 1567b93fadfSCorey Bryant static bool has_vnet_hdr(int fd) 1577b93fadfSCorey Bryant { 1587b93fadfSCorey Bryant unsigned int features = 0; 1597b93fadfSCorey Bryant 1607b93fadfSCorey Bryant if (ioctl(fd, TUNGETFEATURES, &features) == -1) { 1617b93fadfSCorey Bryant return false; 1627b93fadfSCorey Bryant } 1637b93fadfSCorey Bryant 1647b93fadfSCorey Bryant if (!(features & IFF_VNET_HDR)) { 1657b93fadfSCorey Bryant return false; 1667b93fadfSCorey Bryant } 1677b93fadfSCorey Bryant 1687b93fadfSCorey Bryant return true; 1697b93fadfSCorey Bryant } 1707b93fadfSCorey Bryant 1717b93fadfSCorey Bryant static void prep_ifreq(struct ifreq *ifr, const char *ifname) 1727b93fadfSCorey Bryant { 1737b93fadfSCorey Bryant memset(ifr, 0, sizeof(*ifr)); 1747b93fadfSCorey Bryant snprintf(ifr->ifr_name, IFNAMSIZ, "%s", ifname); 1757b93fadfSCorey Bryant } 1767b93fadfSCorey Bryant 1777b93fadfSCorey Bryant static int send_fd(int c, int fd) 1787b93fadfSCorey Bryant { 1797b93fadfSCorey Bryant char msgbuf[CMSG_SPACE(sizeof(fd))]; 1807b93fadfSCorey Bryant struct msghdr msg = { 1817b93fadfSCorey Bryant .msg_control = msgbuf, 1827b93fadfSCorey Bryant .msg_controllen = sizeof(msgbuf), 1837b93fadfSCorey Bryant }; 1847b93fadfSCorey Bryant struct cmsghdr *cmsg; 1857b93fadfSCorey Bryant struct iovec iov; 1867b93fadfSCorey Bryant char req[1] = { 0x00 }; 1877b93fadfSCorey Bryant 1887b93fadfSCorey Bryant cmsg = CMSG_FIRSTHDR(&msg); 1897b93fadfSCorey Bryant cmsg->cmsg_level = SOL_SOCKET; 1907b93fadfSCorey Bryant cmsg->cmsg_type = SCM_RIGHTS; 1917b93fadfSCorey Bryant cmsg->cmsg_len = CMSG_LEN(sizeof(fd)); 1927b93fadfSCorey Bryant msg.msg_controllen = cmsg->cmsg_len; 1937b93fadfSCorey Bryant 1947b93fadfSCorey Bryant iov.iov_base = req; 1957b93fadfSCorey Bryant iov.iov_len = sizeof(req); 1967b93fadfSCorey Bryant 1977b93fadfSCorey Bryant msg.msg_iov = &iov; 1987b93fadfSCorey Bryant msg.msg_iovlen = 1; 1997b93fadfSCorey Bryant memcpy(CMSG_DATA(cmsg), &fd, sizeof(fd)); 2007b93fadfSCorey Bryant 2017b93fadfSCorey Bryant return sendmsg(c, &msg, 0); 2027b93fadfSCorey Bryant } 2037b93fadfSCorey Bryant 20447e98658SCorey Bryant #ifdef CONFIG_LIBCAP 20547e98658SCorey Bryant static int drop_privileges(void) 20647e98658SCorey Bryant { 20747e98658SCorey Bryant /* clear all capabilities */ 20847e98658SCorey Bryant capng_clear(CAPNG_SELECT_BOTH); 20947e98658SCorey Bryant 21047e98658SCorey Bryant if (capng_update(CAPNG_ADD, CAPNG_EFFECTIVE | CAPNG_PERMITTED, 21147e98658SCorey Bryant CAP_NET_ADMIN) < 0) { 21247e98658SCorey Bryant return -1; 21347e98658SCorey Bryant } 21447e98658SCorey Bryant 21547e98658SCorey Bryant /* change to calling user's real uid and gid, retaining supplemental 21647e98658SCorey Bryant * groups and CAP_NET_ADMIN */ 21747e98658SCorey Bryant if (capng_change_id(getuid(), getgid(), CAPNG_CLEAR_BOUNDING)) { 21847e98658SCorey Bryant return -1; 21947e98658SCorey Bryant } 22047e98658SCorey Bryant 22147e98658SCorey Bryant return 0; 22247e98658SCorey Bryant } 22347e98658SCorey Bryant #endif 22447e98658SCorey Bryant 2257b93fadfSCorey Bryant int main(int argc, char **argv) 2267b93fadfSCorey Bryant { 2277b93fadfSCorey Bryant struct ifreq ifr; 228*34309d2bSCorey Bryant #ifndef SIOCBRADDIF 229*34309d2bSCorey Bryant unsigned long ifargs[4]; 230*34309d2bSCorey Bryant #endif 231*34309d2bSCorey Bryant int ifindex; 2327b93fadfSCorey Bryant int fd, ctlfd, unixfd = -1; 2337b93fadfSCorey Bryant int use_vnet = 0; 2347b93fadfSCorey Bryant int mtu; 2357b93fadfSCorey Bryant const char *bridge = NULL; 2367b93fadfSCorey Bryant char iface[IFNAMSIZ]; 2377b93fadfSCorey Bryant int index; 238bdef79a2SCorey Bryant ACLRule *acl_rule; 239bdef79a2SCorey Bryant ACLList acl_list; 240bdef79a2SCorey Bryant int access_allowed, access_denied; 2417b93fadfSCorey Bryant int ret = EXIT_SUCCESS; 2427b93fadfSCorey Bryant 24347e98658SCorey Bryant #ifdef CONFIG_LIBCAP 24447e98658SCorey Bryant /* if we're run from an suid binary, immediately drop privileges preserving 24547e98658SCorey Bryant * cap_net_admin */ 24647e98658SCorey Bryant if (geteuid() == 0 && getuid() != geteuid()) { 24747e98658SCorey Bryant if (drop_privileges() == -1) { 24847e98658SCorey Bryant fprintf(stderr, "failed to drop privileges\n"); 24947e98658SCorey Bryant return 1; 25047e98658SCorey Bryant } 25147e98658SCorey Bryant } 25247e98658SCorey Bryant #endif 25347e98658SCorey Bryant 2547b93fadfSCorey Bryant /* parse arguments */ 2557b93fadfSCorey Bryant for (index = 1; index < argc; index++) { 2567b93fadfSCorey Bryant if (strcmp(argv[index], "--use-vnet") == 0) { 2577b93fadfSCorey Bryant use_vnet = 1; 2587b93fadfSCorey Bryant } else if (strncmp(argv[index], "--br=", 5) == 0) { 2597b93fadfSCorey Bryant bridge = &argv[index][5]; 2607b93fadfSCorey Bryant } else if (strncmp(argv[index], "--fd=", 5) == 0) { 2617b93fadfSCorey Bryant unixfd = atoi(&argv[index][5]); 2627b93fadfSCorey Bryant } else { 2637b93fadfSCorey Bryant usage(); 2647b93fadfSCorey Bryant return EXIT_FAILURE; 2657b93fadfSCorey Bryant } 2667b93fadfSCorey Bryant } 2677b93fadfSCorey Bryant 2687b93fadfSCorey Bryant if (bridge == NULL || unixfd == -1) { 2697b93fadfSCorey Bryant usage(); 2707b93fadfSCorey Bryant return EXIT_FAILURE; 2717b93fadfSCorey Bryant } 2727b93fadfSCorey Bryant 273bdef79a2SCorey Bryant /* parse default acl file */ 274bdef79a2SCorey Bryant QSIMPLEQ_INIT(&acl_list); 275bdef79a2SCorey Bryant if (parse_acl_file(DEFAULT_ACL_FILE, &acl_list) == -1) { 276bdef79a2SCorey Bryant fprintf(stderr, "failed to parse default acl file `%s'\n", 277bdef79a2SCorey Bryant DEFAULT_ACL_FILE); 278bdef79a2SCorey Bryant ret = EXIT_FAILURE; 279bdef79a2SCorey Bryant goto cleanup; 280bdef79a2SCorey Bryant } 281bdef79a2SCorey Bryant 282bdef79a2SCorey Bryant /* validate bridge against acl -- default policy is to deny 283bdef79a2SCorey Bryant * according acl policy if we have a deny and allow both 284bdef79a2SCorey Bryant * then deny should always win over allow 285bdef79a2SCorey Bryant */ 286bdef79a2SCorey Bryant access_allowed = 0; 287bdef79a2SCorey Bryant access_denied = 0; 288bdef79a2SCorey Bryant QSIMPLEQ_FOREACH(acl_rule, &acl_list, entry) { 289bdef79a2SCorey Bryant switch (acl_rule->type) { 290bdef79a2SCorey Bryant case ACL_ALLOW_ALL: 291bdef79a2SCorey Bryant access_allowed = 1; 292bdef79a2SCorey Bryant break; 293bdef79a2SCorey Bryant case ACL_ALLOW: 294bdef79a2SCorey Bryant if (strcmp(bridge, acl_rule->iface) == 0) { 295bdef79a2SCorey Bryant access_allowed = 1; 296bdef79a2SCorey Bryant } 297bdef79a2SCorey Bryant break; 298bdef79a2SCorey Bryant case ACL_DENY_ALL: 299bdef79a2SCorey Bryant access_denied = 1; 300bdef79a2SCorey Bryant break; 301bdef79a2SCorey Bryant case ACL_DENY: 302bdef79a2SCorey Bryant if (strcmp(bridge, acl_rule->iface) == 0) { 303bdef79a2SCorey Bryant access_denied = 1; 304bdef79a2SCorey Bryant } 305bdef79a2SCorey Bryant break; 306bdef79a2SCorey Bryant } 307bdef79a2SCorey Bryant } 308bdef79a2SCorey Bryant 309bdef79a2SCorey Bryant if ((access_allowed == 0) || (access_denied == 1)) { 310bdef79a2SCorey Bryant fprintf(stderr, "access denied by acl file\n"); 311bdef79a2SCorey Bryant ret = EXIT_FAILURE; 312bdef79a2SCorey Bryant goto cleanup; 313bdef79a2SCorey Bryant } 314bdef79a2SCorey Bryant 3157b93fadfSCorey Bryant /* open a socket to use to control the network interfaces */ 3167b93fadfSCorey Bryant ctlfd = socket(AF_INET, SOCK_STREAM, 0); 3177b93fadfSCorey Bryant if (ctlfd == -1) { 3187b93fadfSCorey Bryant fprintf(stderr, "failed to open control socket: %s\n", strerror(errno)); 3197b93fadfSCorey Bryant ret = EXIT_FAILURE; 3207b93fadfSCorey Bryant goto cleanup; 3217b93fadfSCorey Bryant } 3227b93fadfSCorey Bryant 3237b93fadfSCorey Bryant /* open the tap device */ 3247b93fadfSCorey Bryant fd = open("/dev/net/tun", O_RDWR); 3257b93fadfSCorey Bryant if (fd == -1) { 3267b93fadfSCorey Bryant fprintf(stderr, "failed to open /dev/net/tun: %s\n", strerror(errno)); 3277b93fadfSCorey Bryant ret = EXIT_FAILURE; 3287b93fadfSCorey Bryant goto cleanup; 3297b93fadfSCorey Bryant } 3307b93fadfSCorey Bryant 3317b93fadfSCorey Bryant /* request a tap device, disable PI, and add vnet header support if 3327b93fadfSCorey Bryant * requested and it's available. */ 3337b93fadfSCorey Bryant prep_ifreq(&ifr, "tap%d"); 3347b93fadfSCorey Bryant ifr.ifr_flags = IFF_TAP|IFF_NO_PI; 3357b93fadfSCorey Bryant if (use_vnet && has_vnet_hdr(fd)) { 3367b93fadfSCorey Bryant ifr.ifr_flags |= IFF_VNET_HDR; 3377b93fadfSCorey Bryant } 3387b93fadfSCorey Bryant 3397b93fadfSCorey Bryant if (ioctl(fd, TUNSETIFF, &ifr) == -1) { 3407b93fadfSCorey Bryant fprintf(stderr, "failed to create tun device: %s\n", strerror(errno)); 3417b93fadfSCorey Bryant ret = EXIT_FAILURE; 3427b93fadfSCorey Bryant goto cleanup; 3437b93fadfSCorey Bryant } 3447b93fadfSCorey Bryant 3457b93fadfSCorey Bryant /* save tap device name */ 3467b93fadfSCorey Bryant snprintf(iface, sizeof(iface), "%s", ifr.ifr_name); 3477b93fadfSCorey Bryant 3487b93fadfSCorey Bryant /* get the mtu of the bridge */ 3497b93fadfSCorey Bryant prep_ifreq(&ifr, bridge); 3507b93fadfSCorey Bryant if (ioctl(ctlfd, SIOCGIFMTU, &ifr) == -1) { 3517b93fadfSCorey Bryant fprintf(stderr, "failed to get mtu of bridge `%s': %s\n", 3527b93fadfSCorey Bryant bridge, strerror(errno)); 3537b93fadfSCorey Bryant ret = EXIT_FAILURE; 3547b93fadfSCorey Bryant goto cleanup; 3557b93fadfSCorey Bryant } 3567b93fadfSCorey Bryant 3577b93fadfSCorey Bryant /* save mtu */ 3587b93fadfSCorey Bryant mtu = ifr.ifr_mtu; 3597b93fadfSCorey Bryant 3607b93fadfSCorey Bryant /* set the mtu of the interface based on the bridge */ 3617b93fadfSCorey Bryant prep_ifreq(&ifr, iface); 3627b93fadfSCorey Bryant ifr.ifr_mtu = mtu; 3637b93fadfSCorey Bryant if (ioctl(ctlfd, SIOCSIFMTU, &ifr) == -1) { 3647b93fadfSCorey Bryant fprintf(stderr, "failed to set mtu of device `%s' to %d: %s\n", 3657b93fadfSCorey Bryant iface, mtu, strerror(errno)); 3667b93fadfSCorey Bryant ret = EXIT_FAILURE; 3677b93fadfSCorey Bryant goto cleanup; 3687b93fadfSCorey Bryant } 3697b93fadfSCorey Bryant 3707b93fadfSCorey Bryant /* add the interface to the bridge */ 3717b93fadfSCorey Bryant prep_ifreq(&ifr, bridge); 372*34309d2bSCorey Bryant ifindex = if_nametoindex(iface); 373*34309d2bSCorey Bryant #ifndef SIOCBRADDIF 374*34309d2bSCorey Bryant ifargs[0] = BRCTL_ADD_IF; 375*34309d2bSCorey Bryant ifargs[1] = ifindex; 376*34309d2bSCorey Bryant ifargs[2] = 0; 377*34309d2bSCorey Bryant ifargs[3] = 0; 378*34309d2bSCorey Bryant ifr.ifr_data = (void *)ifargs; 379*34309d2bSCorey Bryant ret = ioctl(ctlfd, SIOCDEVPRIVATE, &ifr); 380*34309d2bSCorey Bryant #else 381*34309d2bSCorey Bryant ifr.ifr_ifindex = ifindex; 382*34309d2bSCorey Bryant ret = ioctl(ctlfd, SIOCBRADDIF, &ifr); 383*34309d2bSCorey Bryant #endif 384*34309d2bSCorey Bryant if (ret == -1) { 3857b93fadfSCorey Bryant fprintf(stderr, "failed to add interface `%s' to bridge `%s': %s\n", 3867b93fadfSCorey Bryant iface, bridge, strerror(errno)); 3877b93fadfSCorey Bryant ret = EXIT_FAILURE; 3887b93fadfSCorey Bryant goto cleanup; 3897b93fadfSCorey Bryant } 3907b93fadfSCorey Bryant 3917b93fadfSCorey Bryant /* bring the interface up */ 3927b93fadfSCorey Bryant prep_ifreq(&ifr, iface); 3937b93fadfSCorey Bryant if (ioctl(ctlfd, SIOCGIFFLAGS, &ifr) == -1) { 3947b93fadfSCorey Bryant fprintf(stderr, "failed to get interface flags for `%s': %s\n", 3957b93fadfSCorey Bryant iface, strerror(errno)); 3967b93fadfSCorey Bryant ret = EXIT_FAILURE; 3977b93fadfSCorey Bryant goto cleanup; 3987b93fadfSCorey Bryant } 3997b93fadfSCorey Bryant 4007b93fadfSCorey Bryant ifr.ifr_flags |= IFF_UP; 4017b93fadfSCorey Bryant if (ioctl(ctlfd, SIOCSIFFLAGS, &ifr) == -1) { 4027b93fadfSCorey Bryant fprintf(stderr, "failed to bring up interface `%s': %s\n", 4037b93fadfSCorey Bryant iface, strerror(errno)); 4047b93fadfSCorey Bryant ret = EXIT_FAILURE; 4057b93fadfSCorey Bryant goto cleanup; 4067b93fadfSCorey Bryant } 4077b93fadfSCorey Bryant 4087b93fadfSCorey Bryant /* write fd to the domain socket */ 4097b93fadfSCorey Bryant if (send_fd(unixfd, fd) == -1) { 4107b93fadfSCorey Bryant fprintf(stderr, "failed to write fd to unix socket: %s\n", 4117b93fadfSCorey Bryant strerror(errno)); 4127b93fadfSCorey Bryant ret = EXIT_FAILURE; 4137b93fadfSCorey Bryant goto cleanup; 4147b93fadfSCorey Bryant } 4157b93fadfSCorey Bryant 4167b93fadfSCorey Bryant /* ... */ 4177b93fadfSCorey Bryant 4187b93fadfSCorey Bryant /* profit! */ 4197b93fadfSCorey Bryant 4207b93fadfSCorey Bryant cleanup: 4217b93fadfSCorey Bryant 422bdef79a2SCorey Bryant while ((acl_rule = QSIMPLEQ_FIRST(&acl_list)) != NULL) { 423bdef79a2SCorey Bryant QSIMPLEQ_REMOVE_HEAD(&acl_list, entry); 424bdef79a2SCorey Bryant g_free(acl_rule); 425bdef79a2SCorey Bryant } 426bdef79a2SCorey Bryant 4277b93fadfSCorey Bryant return ret; 4287b93fadfSCorey Bryant } 429