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/ctype.h" 29 #include "qemu/cutils.h" 30 31 #include <sys/ethernet.h> 32 #include <sys/sockio.h> 33 #include <netinet/arp.h> 34 #include <netinet/in.h> 35 #include <netinet/in_systm.h> 36 #include <netinet/ip.h> 37 #include <netinet/ip_icmp.h> // must come after ip.h 38 #include <netinet/udp.h> 39 #include <netinet/tcp.h> 40 #include <net/if.h> 41 #include <stropts.h> 42 #include "qemu/error-report.h" 43 44 ssize_t tap_read_packet(int tapfd, uint8_t *buf, int maxlen) 45 { 46 struct strbuf sbuf; 47 int f = 0; 48 49 sbuf.maxlen = maxlen; 50 sbuf.buf = (char *)buf; 51 52 return getmsg(tapfd, NULL, &sbuf, &f) >= 0 ? sbuf.len : -1; 53 } 54 55 #define TUNNEWPPA (('T'<<16) | 0x0001) 56 /* 57 * Allocate TAP device, returns opened fd. 58 * Stores dev name in the first arg(must be large enough). 59 */ 60 static int tap_alloc(char *dev, size_t dev_size, Error **errp) 61 { 62 /* FIXME leaks like a sieve on error paths */ 63 /* FIXME suspicious: many errors are reported, then ignored */ 64 int tap_fd, if_fd, ppa = -1; 65 static int ip_fd = 0; 66 char *ptr; 67 68 static int arp_fd = 0; 69 int ip_muxid, arp_muxid; 70 struct strioctl strioc_if, strioc_ppa; 71 int link_type = I_PLINK; 72 struct lifreq ifr; 73 char actual_name[32] = ""; 74 75 memset(&ifr, 0x0, sizeof(ifr)); 76 77 if( *dev ){ 78 ptr = dev; 79 while( *ptr && !qemu_isdigit((int)*ptr) ) ptr++; 80 ppa = atoi(ptr); 81 } 82 83 /* Check if IP device was opened */ 84 if( ip_fd ) 85 close(ip_fd); 86 87 ip_fd = RETRY_ON_EINTR(open("/dev/udp", O_RDWR, 0)); 88 if (ip_fd < 0) { 89 error_setg(errp, "Can't open /dev/ip (actually /dev/udp)"); 90 return -1; 91 } 92 93 tap_fd = RETRY_ON_EINTR(open("/dev/tap", O_RDWR, 0)); 94 if (tap_fd < 0) { 95 error_setg(errp, "Can't open /dev/tap"); 96 return -1; 97 } 98 99 /* Assign a new PPA and get its unit number. */ 100 strioc_ppa.ic_cmd = TUNNEWPPA; 101 strioc_ppa.ic_timout = 0; 102 strioc_ppa.ic_len = sizeof(ppa); 103 strioc_ppa.ic_dp = (char *)&ppa; 104 if ((ppa = ioctl (tap_fd, I_STR, &strioc_ppa)) < 0) 105 error_report("Can't assign new interface"); 106 107 if_fd = RETRY_ON_EINTR(open("/dev/tap", O_RDWR, 0)); 108 if (if_fd < 0) { 109 error_setg(errp, "Can't open /dev/tap (2)"); 110 return -1; 111 } 112 if(ioctl(if_fd, I_PUSH, "ip") < 0){ 113 error_setg(errp, "Can't push IP module"); 114 return -1; 115 } 116 117 if (ioctl(if_fd, SIOCGLIFFLAGS, &ifr) < 0) 118 error_report("Can't get flags"); 119 120 snprintf (actual_name, 32, "tap%d", ppa); 121 pstrcpy(ifr.lifr_name, sizeof(ifr.lifr_name), actual_name); 122 123 ifr.lifr_ppa = ppa; 124 /* Assign ppa according to the unit number returned by tun device */ 125 126 if (ioctl (if_fd, SIOCSLIFNAME, &ifr) < 0) 127 error_report("Can't set PPA %d", ppa); 128 if (ioctl(if_fd, SIOCGLIFFLAGS, &ifr) <0) 129 error_report("Can't get flags"); 130 /* Push arp module to if_fd */ 131 if (ioctl (if_fd, I_PUSH, "arp") < 0) 132 error_report("Can't push ARP module (2)"); 133 134 /* Push arp module to ip_fd */ 135 if (ioctl (ip_fd, I_POP, NULL) < 0) 136 error_report("I_POP failed"); 137 if (ioctl (ip_fd, I_PUSH, "arp") < 0) 138 error_report("Can't push ARP module (3)"); 139 /* Open arp_fd */ 140 arp_fd = RETRY_ON_EINTR(open("/dev/tap", O_RDWR, 0)); 141 if (arp_fd < 0) 142 error_report("Can't open %s", "/dev/tap"); 143 144 /* Set ifname to arp */ 145 strioc_if.ic_cmd = SIOCSLIFNAME; 146 strioc_if.ic_timout = 0; 147 strioc_if.ic_len = sizeof(ifr); 148 strioc_if.ic_dp = (char *)𝔦 149 if (ioctl(arp_fd, I_STR, &strioc_if) < 0){ 150 error_report("Can't set ifname to arp"); 151 } 152 153 if((ip_muxid = ioctl(ip_fd, I_LINK, if_fd)) < 0){ 154 error_setg(errp, "Can't link TAP device to IP"); 155 return -1; 156 } 157 158 if ((arp_muxid = ioctl (ip_fd, link_type, arp_fd)) < 0) 159 error_report("Can't link TAP device to ARP"); 160 161 close (if_fd); 162 163 memset(&ifr, 0x0, sizeof(ifr)); 164 pstrcpy(ifr.lifr_name, sizeof(ifr.lifr_name), actual_name); 165 ifr.lifr_ip_muxid = ip_muxid; 166 ifr.lifr_arp_muxid = arp_muxid; 167 168 if (ioctl (ip_fd, SIOCSLIFMUXID, &ifr) < 0) 169 { 170 ioctl (ip_fd, I_PUNLINK , arp_muxid); 171 ioctl (ip_fd, I_PUNLINK, ip_muxid); 172 error_report("Can't set multiplexor id"); 173 } 174 175 snprintf(dev, dev_size, "tap%d", ppa); 176 return tap_fd; 177 } 178 179 int tap_open(char *ifname, int ifname_size, int *vnet_hdr, 180 int vnet_hdr_required, int mq_required, Error **errp) 181 { 182 char dev[10]=""; 183 int fd; 184 185 fd = tap_alloc(dev, sizeof(dev), errp); 186 if (fd < 0) { 187 return -1; 188 } 189 pstrcpy(ifname, ifname_size, dev); 190 if (*vnet_hdr) { 191 /* Solaris doesn't have IFF_VNET_HDR */ 192 *vnet_hdr = 0; 193 194 if (vnet_hdr_required && !*vnet_hdr) { 195 error_setg(errp, "vnet_hdr=1 requested, but no kernel " 196 "support for IFF_VNET_HDR available"); 197 close(fd); 198 return -1; 199 } 200 } 201 g_unix_set_fd_nonblocking(fd, true, NULL); 202 return fd; 203 } 204 205 void tap_set_sndbuf(int fd, const NetdevTapOptions *tap, Error **errp) 206 { 207 } 208 209 int tap_probe_vnet_hdr(int fd, Error **errp) 210 { 211 return 0; 212 } 213 214 int tap_probe_has_ufo(int fd) 215 { 216 return 0; 217 } 218 219 int tap_probe_vnet_hdr_len(int fd, int len) 220 { 221 return 0; 222 } 223 224 void tap_fd_set_vnet_hdr_len(int fd, int len) 225 { 226 } 227 228 int tap_fd_set_vnet_le(int fd, int is_le) 229 { 230 return -EINVAL; 231 } 232 233 int tap_fd_set_vnet_be(int fd, int is_be) 234 { 235 return -EINVAL; 236 } 237 238 void tap_fd_set_offload(int fd, int csum, int tso4, 239 int tso6, int ecn, int ufo) 240 { 241 } 242 243 int tap_fd_enable(int fd) 244 { 245 return -1; 246 } 247 248 int tap_fd_disable(int fd) 249 { 250 return -1; 251 } 252 253 int tap_fd_get_ifname(int fd, char *ifname) 254 { 255 return -1; 256 } 257 258 int tap_fd_set_steering_ebpf(int fd, int prog_fd) 259 { 260 return -1; 261 } 262