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 "tap_int.h" 26 #include "sysemu/sysemu.h" 27 28 #include <sys/stat.h> 29 #include <sys/ethernet.h> 30 #include <sys/sockio.h> 31 #include <netinet/arp.h> 32 #include <netinet/in.h> 33 #include <netinet/in_systm.h> 34 #include <netinet/ip.h> 35 #include <netinet/ip_icmp.h> // must come after ip.h 36 #include <netinet/udp.h> 37 #include <netinet/tcp.h> 38 #include <net/if.h> 39 #include <stropts.h> 40 #include "qemu/error-report.h" 41 42 ssize_t tap_read_packet(int tapfd, uint8_t *buf, int maxlen) 43 { 44 struct strbuf sbuf; 45 int f = 0; 46 47 sbuf.maxlen = maxlen; 48 sbuf.buf = (char *)buf; 49 50 return getmsg(tapfd, NULL, &sbuf, &f) >= 0 ? sbuf.len : -1; 51 } 52 53 #define TUNNEWPPA (('T'<<16) | 0x0001) 54 /* 55 * Allocate TAP device, returns opened fd. 56 * Stores dev name in the first arg(must be large enough). 57 */ 58 static int tap_alloc(char *dev, size_t dev_size, Error **errp) 59 { 60 /* FIXME leaks like a sieve on error paths */ 61 /* FIXME suspicious: many errors are reported, then ignored */ 62 int tap_fd, if_fd, ppa = -1; 63 static int ip_fd = 0; 64 char *ptr; 65 66 static int arp_fd = 0; 67 int ip_muxid, arp_muxid; 68 struct strioctl strioc_if, strioc_ppa; 69 int link_type = I_PLINK; 70 struct lifreq ifr; 71 char actual_name[32] = ""; 72 73 memset(&ifr, 0x0, sizeof(ifr)); 74 75 if( *dev ){ 76 ptr = dev; 77 while( *ptr && !qemu_isdigit((int)*ptr) ) ptr++; 78 ppa = atoi(ptr); 79 } 80 81 /* Check if IP device was opened */ 82 if( ip_fd ) 83 close(ip_fd); 84 85 TFR(ip_fd = open("/dev/udp", O_RDWR, 0)); 86 if (ip_fd < 0) { 87 error_setg(errp, "Can't open /dev/ip (actually /dev/udp)"); 88 return -1; 89 } 90 91 TFR(tap_fd = open("/dev/tap", O_RDWR, 0)); 92 if (tap_fd < 0) { 93 error_setg(errp, "Can't open /dev/tap"); 94 return -1; 95 } 96 97 /* Assign a new PPA and get its unit number. */ 98 strioc_ppa.ic_cmd = TUNNEWPPA; 99 strioc_ppa.ic_timout = 0; 100 strioc_ppa.ic_len = sizeof(ppa); 101 strioc_ppa.ic_dp = (char *)&ppa; 102 if ((ppa = ioctl (tap_fd, I_STR, &strioc_ppa)) < 0) 103 error_report("Can't assign new interface"); 104 105 TFR(if_fd = open("/dev/tap", O_RDWR, 0)); 106 if (if_fd < 0) { 107 error_setg(errp, "Can't open /dev/tap (2)"); 108 return -1; 109 } 110 if(ioctl(if_fd, I_PUSH, "ip") < 0){ 111 error_setg(errp, "Can't push IP module"); 112 return -1; 113 } 114 115 if (ioctl(if_fd, SIOCGLIFFLAGS, &ifr) < 0) 116 error_report("Can't get flags"); 117 118 snprintf (actual_name, 32, "tap%d", ppa); 119 pstrcpy(ifr.lifr_name, sizeof(ifr.lifr_name), actual_name); 120 121 ifr.lifr_ppa = ppa; 122 /* Assign ppa according to the unit number returned by tun device */ 123 124 if (ioctl (if_fd, SIOCSLIFNAME, &ifr) < 0) 125 error_report("Can't set PPA %d", ppa); 126 if (ioctl(if_fd, SIOCGLIFFLAGS, &ifr) <0) 127 error_report("Can't get flags"); 128 /* Push arp module to if_fd */ 129 if (ioctl (if_fd, I_PUSH, "arp") < 0) 130 error_report("Can't push ARP module (2)"); 131 132 /* Push arp module to ip_fd */ 133 if (ioctl (ip_fd, I_POP, NULL) < 0) 134 error_report("I_POP failed"); 135 if (ioctl (ip_fd, I_PUSH, "arp") < 0) 136 error_report("Can't push ARP module (3)"); 137 /* Open arp_fd */ 138 TFR(arp_fd = open ("/dev/tap", O_RDWR, 0)); 139 if (arp_fd < 0) 140 error_report("Can't open %s", "/dev/tap"); 141 142 /* Set ifname to arp */ 143 strioc_if.ic_cmd = SIOCSLIFNAME; 144 strioc_if.ic_timout = 0; 145 strioc_if.ic_len = sizeof(ifr); 146 strioc_if.ic_dp = (char *)𝔦 147 if (ioctl(arp_fd, I_STR, &strioc_if) < 0){ 148 error_report("Can't set ifname to arp"); 149 } 150 151 if((ip_muxid = ioctl(ip_fd, I_LINK, if_fd)) < 0){ 152 error_setg(errp, "Can't link TAP device to IP"); 153 return -1; 154 } 155 156 if ((arp_muxid = ioctl (ip_fd, link_type, arp_fd)) < 0) 157 error_report("Can't link TAP device to ARP"); 158 159 close (if_fd); 160 161 memset(&ifr, 0x0, sizeof(ifr)); 162 pstrcpy(ifr.lifr_name, sizeof(ifr.lifr_name), actual_name); 163 ifr.lifr_ip_muxid = ip_muxid; 164 ifr.lifr_arp_muxid = arp_muxid; 165 166 if (ioctl (ip_fd, SIOCSLIFMUXID, &ifr) < 0) 167 { 168 ioctl (ip_fd, I_PUNLINK , arp_muxid); 169 ioctl (ip_fd, I_PUNLINK, ip_muxid); 170 error_report("Can't set multiplexor id"); 171 } 172 173 snprintf(dev, dev_size, "tap%d", ppa); 174 return tap_fd; 175 } 176 177 int tap_open(char *ifname, int ifname_size, int *vnet_hdr, 178 int vnet_hdr_required, int mq_required, Error **errp) 179 { 180 char dev[10]=""; 181 int fd; 182 183 fd = tap_alloc(dev, sizeof(dev), errp); 184 if (fd < 0) { 185 return -1; 186 } 187 pstrcpy(ifname, ifname_size, dev); 188 if (*vnet_hdr) { 189 /* Solaris doesn't have IFF_VNET_HDR */ 190 *vnet_hdr = 0; 191 192 if (vnet_hdr_required && !*vnet_hdr) { 193 error_setg(errp, "vnet_hdr=1 requested, but no kernel " 194 "support for IFF_VNET_HDR available"); 195 close(fd); 196 return -1; 197 } 198 } 199 fcntl(fd, F_SETFL, O_NONBLOCK); 200 return fd; 201 } 202 203 void tap_set_sndbuf(int fd, const NetdevTapOptions *tap, Error **errp) 204 { 205 } 206 207 int tap_probe_vnet_hdr(int fd) 208 { 209 return 0; 210 } 211 212 int tap_probe_has_ufo(int fd) 213 { 214 return 0; 215 } 216 217 int tap_probe_vnet_hdr_len(int fd, int len) 218 { 219 return 0; 220 } 221 222 void tap_fd_set_vnet_hdr_len(int fd, int len) 223 { 224 } 225 226 int tap_fd_set_vnet_le(int fd, int is_le) 227 { 228 return -EINVAL; 229 } 230 231 int tap_fd_set_vnet_be(int fd, int is_be) 232 { 233 return -EINVAL; 234 } 235 236 void tap_fd_set_offload(int fd, int csum, int tso4, 237 int tso6, int ecn, int ufo) 238 { 239 } 240 241 int tap_fd_enable(int fd) 242 { 243 return -1; 244 } 245 246 int tap_fd_disable(int fd) 247 { 248 return -1; 249 } 250 251 int tap_fd_get_ifname(int fd, char *ifname) 252 { 253 return -1; 254 } 255