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