| 1 | /* |
| 2 | * QEMU System Emulator |
| 3 | * |
| 4 | * Copyright (c) 2003-2008 Fabrice Bellard |
| 5 | * |
| 6 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 7 | * of this software and associated documentation files (the "Software"), to deal |
| 8 | * in the Software without restriction, including without limitation the rights |
| 9 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 10 | * copies of the Software, and to permit persons to whom the Software is |
| 11 | * furnished to do so, subject to the following conditions: |
| 12 | * |
| 13 | * The above copyright notice and this permission notice shall be included in |
| 14 | * all copies or substantial portions of the Software. |
| 15 | * |
| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| 19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 21 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 22 | * THE SOFTWARE. |
| 23 | */ |
| 24 | |
| 25 | #include "qemu/osdep.h" |
| 26 | #include "qapi/error.h" |
| 27 | #include "tap_int.h" |
| 28 | #include "qemu/cutils.h" |
| 29 | #include "qemu/error-report.h" |
| 30 | |
| 31 | #if defined(__NetBSD__) || defined(__FreeBSD__) |
| 32 | #include <sys/ioctl.h> |
| 33 | #include <net/if.h> |
| 34 | #include <net/if_tap.h> |
| 35 | #endif |
| 36 | |
| 37 | #ifndef __FreeBSD__ |
| 38 | int tap_open(char *ifname, int ifname_size, int *vnet_hdr, |
| 39 | int vnet_hdr_required, int mq_required, Error **errp) |
| 40 | { |
| 41 | int fd; |
| 42 | #ifdef TAPGIFNAME |
| 43 | struct ifreq ifr; |
| 44 | #else |
| 45 | char *dev; |
| 46 | struct stat s; |
| 47 | #endif |
| 48 | |
| 49 | /* if no ifname is given, always start the search from tap0/tun0. */ |
| 50 | int i; |
| 51 | char dname[100]; |
| 52 | |
| 53 | for (i = 0; i < 10; i++) { |
| 54 | if (*ifname) { |
| 55 | snprintf(dname, sizeof dname, "/dev/%s", ifname); |
| 56 | } else { |
| 57 | snprintf(dname, sizeof dname, "/dev/tap%d", i); |
| 58 | } |
| 59 | fd = RETRY_ON_EINTR(open(dname, O_RDWR)); |
| 60 | if (fd >= 0) { |
| 61 | break; |
| 62 | } |
| 63 | else if (errno == ENXIO || errno == ENOENT) { |
| 64 | break; |
| 65 | } |
| 66 | if (*ifname) { |
| 67 | break; |
| 68 | } |
| 69 | } |
| 70 | if (fd < 0) { |
| 71 | error_setg_file_open(errp, errno, dname); |
| 72 | return -1; |
| 73 | } |
| 74 | |
| 75 | #ifdef TAPGIFNAME |
| 76 | if (ioctl(fd, TAPGIFNAME, (void *)&ifr) < 0) { |
| 77 | error_setg_errno(errp, errno, "could not get tap name"); |
| 78 | return -1; |
| 79 | } |
| 80 | pstrcpy(ifname, ifname_size, ifr.ifr_name); |
| 81 | #else |
| 82 | if (fstat(fd, &s) < 0) { |
| 83 | error_setg_errno(errp, errno, "could not stat %s", dname); |
| 84 | return -1; |
| 85 | } |
| 86 | dev = devname(s.st_rdev, S_IFCHR); |
| 87 | pstrcpy(ifname, ifname_size, dev); |
| 88 | #endif |
| 89 | |
| 90 | if (*vnet_hdr) { |
| 91 | /* BSD doesn't have IFF_VNET_HDR */ |
| 92 | *vnet_hdr = 0; |
| 93 | |
| 94 | if (vnet_hdr_required && !*vnet_hdr) { |
| 95 | error_setg(errp, "vnet_hdr=1 requested, but no kernel " |
| 96 | "support for IFF_VNET_HDR available"); |
| 97 | close(fd); |
| 98 | return -1; |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | if (!qemu_set_blocking(fd, false, errp)) { |
| 103 | close(fd); |
| 104 | return -1; |
| 105 | } |
| 106 | |
| 107 | return fd; |
| 108 | } |
| 109 | |
| 110 | #else /* __FreeBSD__ */ |
| 111 | |
| 112 | #define PATH_NET_TAP "/dev/tap" |
| 113 | |
| 114 | static int tap_open_clone(char *ifname, int ifname_size, Error **errp) |
| 115 | { |
| 116 | int fd, s, ret; |
| 117 | struct ifreq ifr; |
| 118 | |
| 119 | fd = RETRY_ON_EINTR(open(PATH_NET_TAP, O_RDWR)); |
| 120 | if (fd < 0) { |
| 121 | error_setg_file_open(errp, errno, PATH_NET_TAP); |
| 122 | return -1; |
| 123 | } |
| 124 | |
| 125 | memset(&ifr, 0, sizeof(ifr)); |
| 126 | |
| 127 | ret = ioctl(fd, TAPGIFNAME, (void *)&ifr); |
| 128 | if (ret < 0) { |
| 129 | error_setg_errno(errp, errno, "could not get tap interface name"); |
| 130 | close(fd); |
| 131 | return -1; |
| 132 | } |
| 133 | |
| 134 | if (ifname[0] != '\0') { |
| 135 | /* User requested the interface to have a specific name */ |
| 136 | s = socket(AF_LOCAL, SOCK_DGRAM, 0); |
| 137 | if (s < 0) { |
| 138 | error_setg_errno(errp, errno, |
| 139 | "could not open socket to set interface name"); |
| 140 | close(fd); |
| 141 | return -1; |
| 142 | } |
| 143 | ifr.ifr_data = ifname; |
| 144 | ret = ioctl(s, SIOCSIFNAME, (void *)&ifr); |
| 145 | close(s); |
| 146 | if (ret < 0) { |
| 147 | error_setg(errp, "could not set tap interface name"); |
| 148 | close(fd); |
| 149 | return -1; |
| 150 | } |
| 151 | } else { |
| 152 | pstrcpy(ifname, ifname_size, ifr.ifr_name); |
| 153 | } |
| 154 | |
| 155 | return fd; |
| 156 | } |
| 157 | |
| 158 | int tap_open(char *ifname, int ifname_size, int *vnet_hdr, |
| 159 | int vnet_hdr_required, int mq_required, Error **errp) |
| 160 | { |
| 161 | int fd = -1; |
| 162 | |
| 163 | /* If the specified tap device already exists just use it. */ |
| 164 | if (ifname[0] != '\0') { |
| 165 | char dname[100]; |
| 166 | snprintf(dname, sizeof dname, "/dev/%s", ifname); |
| 167 | fd = RETRY_ON_EINTR(open(dname, O_RDWR)); |
| 168 | if (fd < 0 && errno != ENOENT) { |
| 169 | error_setg_file_open(errp, errno, dname); |
| 170 | return -1; |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | if (fd < 0) { |
| 175 | /* Tap device not specified or does not exist. */ |
| 176 | if ((fd = tap_open_clone(ifname, ifname_size, errp)) < 0) { |
| 177 | return -1; |
| 178 | } |
| 179 | } |
| 180 | |
| 181 | if (*vnet_hdr) { |
| 182 | /* BSD doesn't have IFF_VNET_HDR */ |
| 183 | *vnet_hdr = 0; |
| 184 | |
| 185 | if (vnet_hdr_required && !*vnet_hdr) { |
| 186 | error_setg(errp, "vnet_hdr=1 requested, but no kernel " |
| 187 | "support for IFF_VNET_HDR available"); |
| 188 | goto error; |
| 189 | } |
| 190 | } |
| 191 | if (mq_required) { |
| 192 | error_setg(errp, "mq_required requested, but no kernel support" |
| 193 | " for IFF_MULTI_QUEUE available"); |
| 194 | goto error; |
| 195 | } |
| 196 | |
| 197 | if (!qemu_set_blocking(fd, false, errp)) { |
| 198 | goto error; |
| 199 | } |
| 200 | |
| 201 | return fd; |
| 202 | |
| 203 | error: |
| 204 | close(fd); |
| 205 | return -1; |
| 206 | } |
| 207 | #endif /* __FreeBSD__ */ |
| 208 | |
| 209 | bool tap_set_sndbuf(int fd, int sndbuf, Error **errp) |
| 210 | { |
| 211 | return true; |
| 212 | } |
| 213 | |
| 214 | int tap_probe_vnet_hdr(int fd, Error **errp) |
| 215 | { |
| 216 | return 0; |
| 217 | } |
| 218 | |
| 219 | int tap_probe_has_ufo(int fd) |
| 220 | { |
| 221 | return 0; |
| 222 | } |
| 223 | |
| 224 | int tap_probe_has_uso(int fd) |
| 225 | { |
| 226 | return 0; |
| 227 | } |
| 228 | |
| 229 | bool tap_probe_has_tunnel(int fd) |
| 230 | { |
| 231 | return false; |
| 232 | } |
| 233 | |
| 234 | void tap_fd_set_vnet_hdr_len(int fd, int len) |
| 235 | { |
| 236 | } |
| 237 | |
| 238 | int tap_fd_set_vnet_le(int fd, int is_le) |
| 239 | { |
| 240 | return -EINVAL; |
| 241 | } |
| 242 | |
| 243 | int tap_fd_set_vnet_be(int fd, int is_be) |
| 244 | { |
| 245 | return -EINVAL; |
| 246 | } |
| 247 | |
| 248 | void tap_fd_set_offload(int fd, const NetOffloads *ol) |
| 249 | { |
| 250 | } |
| 251 | |
| 252 | int tap_fd_enable(int fd) |
| 253 | { |
| 254 | return -1; |
| 255 | } |
| 256 | |
| 257 | int tap_fd_disable(int fd) |
| 258 | { |
| 259 | return -1; |
| 260 | } |
| 261 | |
| 262 | int tap_fd_get_ifname(int fd, char *ifname) |
| 263 | { |
| 264 | return -1; |
| 265 | } |
| 266 | |
| 267 | int tap_fd_set_steering_ebpf(int fd, int prog_fd) |
| 268 | { |
| 269 | return -1; |
| 270 | } |