| /* |
| * QEMU System Emulator |
| * |
| * Copyright (c) 2003-2008 Fabrice Bellard |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this software and associated documentation files (the "Software"), to deal |
| * in the Software without restriction, including without limitation the rights |
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| * copies of the Software, and to permit persons to whom the Software is |
| * furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in |
| * all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| * THE SOFTWARE. |
| */ |
| |
| #include "qemu/osdep.h" |
| #include "qemu-common.h" |
| #include "qapi/error.h" |
| #include "tap_int.h" |
| #include "qemu/cutils.h" |
| #include "sysemu/sysemu.h" |
| #include "qemu/error-report.h" |
| |
| #if defined(__NetBSD__) || defined(__FreeBSD__) |
| #include <sys/ioctl.h> |
| #include <net/if.h> |
| #include <net/if_tap.h> |
| #endif |
| |
| #if defined(__OpenBSD__) |
| #include <sys/param.h> |
| #endif |
| |
| #ifndef __FreeBSD__ |
| int tap_open(char *ifname, int ifname_size, int *vnet_hdr, |
| int vnet_hdr_required, int mq_required, Error **errp) |
| { |
| int fd; |
| #ifdef TAPGIFNAME |
| struct ifreq ifr; |
| #else |
| char *dev; |
| struct stat s; |
| #endif |
| |
| /* if no ifname is given, always start the search from tap0/tun0. */ |
| int i; |
| char dname[100]; |
| |
| for (i = 0; i < 10; i++) { |
| if (*ifname) { |
| snprintf(dname, sizeof dname, "/dev/%s", ifname); |
| } else { |
| #if defined(__OpenBSD__) && OpenBSD < 201605 |
| snprintf(dname, sizeof dname, "/dev/tun%d", i); |
| #else |
| snprintf(dname, sizeof dname, "/dev/tap%d", i); |
| #endif |
| } |
| TFR(fd = open(dname, O_RDWR)); |
| if (fd >= 0) { |
| break; |
| } |
| else if (errno == ENXIO || errno == ENOENT) { |
| break; |
| } |
| if (*ifname) { |
| break; |
| } |
| } |
| if (fd < 0) { |
| error_setg_errno(errp, errno, "could not open %s", dname); |
| return -1; |
| } |
| |
| #ifdef TAPGIFNAME |
| if (ioctl(fd, TAPGIFNAME, (void *)&ifr) < 0) { |
| error_setg_errno(errp, errno, "could not get tap name"); |
| return -1; |
| } |
| pstrcpy(ifname, ifname_size, ifr.ifr_name); |
| #else |
| if (fstat(fd, &s) < 0) { |
| error_setg_errno(errp, errno, "could not stat %s", dname); |
| return -1; |
| } |
| dev = devname(s.st_rdev, S_IFCHR); |
| pstrcpy(ifname, ifname_size, dev); |
| #endif |
| |
| if (*vnet_hdr) { |
| /* BSD doesn't have IFF_VNET_HDR */ |
| *vnet_hdr = 0; |
| |
| if (vnet_hdr_required && !*vnet_hdr) { |
| error_setg(errp, "vnet_hdr=1 requested, but no kernel " |
| "support for IFF_VNET_HDR available"); |
| close(fd); |
| return -1; |
| } |
| } |
| fcntl(fd, F_SETFL, O_NONBLOCK); |
| return fd; |
| } |
| |
| #else /* __FreeBSD__ */ |
| |
| #define PATH_NET_TAP "/dev/tap" |
| |
| static int tap_open_clone(char *ifname, int ifname_size, Error **errp) |
| { |
| int fd, s, ret; |
| struct ifreq ifr; |
| |
| TFR(fd = open(PATH_NET_TAP, O_RDWR)); |
| if (fd < 0) { |
| error_setg_errno(errp, errno, "could not open %s", PATH_NET_TAP); |
| return -1; |
| } |
| |
| memset(&ifr, 0, sizeof(ifr)); |
| |
| ret = ioctl(fd, TAPGIFNAME, (void *)&ifr); |
| if (ret < 0) { |
| error_setg_errno(errp, errno, "could not get tap interface name"); |
| close(fd); |
| return -1; |
| } |
| |
| if (ifname[0] != '\0') { |
| /* User requested the interface to have a specific name */ |
| s = socket(AF_LOCAL, SOCK_DGRAM, 0); |
| if (s < 0) { |
| error_setg_errno(errp, errno, |
| "could not open socket to set interface name"); |
| close(fd); |
| return -1; |
| } |
| ifr.ifr_data = ifname; |
| ret = ioctl(s, SIOCSIFNAME, (void *)&ifr); |
| close(s); |
| if (ret < 0) { |
| error_setg(errp, "could not set tap interface name"); |
| close(fd); |
| return -1; |
| } |
| } else { |
| pstrcpy(ifname, ifname_size, ifr.ifr_name); |
| } |
| |
| return fd; |
| } |
| |
| int tap_open(char *ifname, int ifname_size, int *vnet_hdr, |
| int vnet_hdr_required, int mq_required, Error **errp) |
| { |
| int fd = -1; |
| |
| /* If the specified tap device already exists just use it. */ |
| if (ifname[0] != '\0') { |
| char dname[100]; |
| snprintf(dname, sizeof dname, "/dev/%s", ifname); |
| TFR(fd = open(dname, O_RDWR)); |
| if (fd < 0 && errno != ENOENT) { |
| error_setg_errno(errp, errno, "could not open %s", dname); |
| return -1; |
| } |
| } |
| |
| if (fd < 0) { |
| /* Tap device not specified or does not exist. */ |
| if ((fd = tap_open_clone(ifname, ifname_size, errp)) < 0) { |
| return -1; |
| } |
| } |
| |
| if (*vnet_hdr) { |
| /* BSD doesn't have IFF_VNET_HDR */ |
| *vnet_hdr = 0; |
| |
| if (vnet_hdr_required && !*vnet_hdr) { |
| error_setg(errp, "vnet_hdr=1 requested, but no kernel " |
| "support for IFF_VNET_HDR available"); |
| goto error; |
| } |
| } |
| if (mq_required) { |
| error_setg(errp, "mq_required requested, but no kernel support" |
| " for IFF_MULTI_QUEUE available"); |
| goto error; |
| } |
| |
| fcntl(fd, F_SETFL, O_NONBLOCK); |
| return fd; |
| |
| error: |
| close(fd); |
| return -1; |
| } |
| #endif /* __FreeBSD__ */ |
| |
| void tap_set_sndbuf(int fd, const NetdevTapOptions *tap, Error **errp) |
| { |
| } |
| |
| int tap_probe_vnet_hdr(int fd) |
| { |
| return 0; |
| } |
| |
| int tap_probe_has_ufo(int fd) |
| { |
| return 0; |
| } |
| |
| int tap_probe_vnet_hdr_len(int fd, int len) |
| { |
| return 0; |
| } |
| |
| void tap_fd_set_vnet_hdr_len(int fd, int len) |
| { |
| } |
| |
| int tap_fd_set_vnet_le(int fd, int is_le) |
| { |
| return -EINVAL; |
| } |
| |
| int tap_fd_set_vnet_be(int fd, int is_be) |
| { |
| return -EINVAL; |
| } |
| |
| void tap_fd_set_offload(int fd, int csum, int tso4, |
| int tso6, int ecn, int ufo) |
| { |
| } |
| |
| int tap_fd_enable(int fd) |
| { |
| return -1; |
| } |
| |
| int tap_fd_disable(int fd) |
| { |
| return -1; |
| } |
| |
| int tap_fd_get_ifname(int fd, char *ifname) |
| { |
| return -1; |
| } |