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