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 <syslog.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) 60 { 61 int tap_fd, if_fd, ppa = -1; 62 static int ip_fd = 0; 63 char *ptr; 64 65 static int arp_fd = 0; 66 int ip_muxid, arp_muxid; 67 struct strioctl strioc_if, strioc_ppa; 68 int link_type = I_PLINK; 69 struct lifreq ifr; 70 char actual_name[32] = ""; 71 72 memset(&ifr, 0x0, sizeof(ifr)); 73 74 if( *dev ){ 75 ptr = dev; 76 while( *ptr && !qemu_isdigit((int)*ptr) ) ptr++; 77 ppa = atoi(ptr); 78 } 79 80 /* Check if IP device was opened */ 81 if( ip_fd ) 82 close(ip_fd); 83 84 TFR(ip_fd = open("/dev/udp", O_RDWR, 0)); 85 if (ip_fd < 0) { 86 syslog(LOG_ERR, "Can't open /dev/ip (actually /dev/udp)"); 87 return -1; 88 } 89 90 TFR(tap_fd = open("/dev/tap", O_RDWR, 0)); 91 if (tap_fd < 0) { 92 syslog(LOG_ERR, "Can't open /dev/tap"); 93 return -1; 94 } 95 96 /* Assign a new PPA and get its unit number. */ 97 strioc_ppa.ic_cmd = TUNNEWPPA; 98 strioc_ppa.ic_timout = 0; 99 strioc_ppa.ic_len = sizeof(ppa); 100 strioc_ppa.ic_dp = (char *)&ppa; 101 if ((ppa = ioctl (tap_fd, I_STR, &strioc_ppa)) < 0) 102 syslog (LOG_ERR, "Can't assign new interface"); 103 104 TFR(if_fd = open("/dev/tap", O_RDWR, 0)); 105 if (if_fd < 0) { 106 syslog(LOG_ERR, "Can't open /dev/tap (2)"); 107 return -1; 108 } 109 if(ioctl(if_fd, I_PUSH, "ip") < 0){ 110 syslog(LOG_ERR, "Can't push IP module"); 111 return -1; 112 } 113 114 if (ioctl(if_fd, SIOCGLIFFLAGS, &ifr) < 0) 115 syslog(LOG_ERR, "Can't get flags\n"); 116 117 snprintf (actual_name, 32, "tap%d", ppa); 118 pstrcpy(ifr.lifr_name, sizeof(ifr.lifr_name), actual_name); 119 120 ifr.lifr_ppa = ppa; 121 /* Assign ppa according to the unit number returned by tun device */ 122 123 if (ioctl (if_fd, SIOCSLIFNAME, &ifr) < 0) 124 syslog (LOG_ERR, "Can't set PPA %d", ppa); 125 if (ioctl(if_fd, SIOCGLIFFLAGS, &ifr) <0) 126 syslog (LOG_ERR, "Can't get flags\n"); 127 /* Push arp module to if_fd */ 128 if (ioctl (if_fd, I_PUSH, "arp") < 0) 129 syslog (LOG_ERR, "Can't push ARP module (2)"); 130 131 /* Push arp module to ip_fd */ 132 if (ioctl (ip_fd, I_POP, NULL) < 0) 133 syslog (LOG_ERR, "I_POP failed\n"); 134 if (ioctl (ip_fd, I_PUSH, "arp") < 0) 135 syslog (LOG_ERR, "Can't push ARP module (3)\n"); 136 /* Open arp_fd */ 137 TFR(arp_fd = open ("/dev/tap", O_RDWR, 0)); 138 if (arp_fd < 0) 139 syslog (LOG_ERR, "Can't open %s\n", "/dev/tap"); 140 141 /* Set ifname to arp */ 142 strioc_if.ic_cmd = SIOCSLIFNAME; 143 strioc_if.ic_timout = 0; 144 strioc_if.ic_len = sizeof(ifr); 145 strioc_if.ic_dp = (char *)𝔦 146 if (ioctl(arp_fd, I_STR, &strioc_if) < 0){ 147 syslog (LOG_ERR, "Can't set ifname to arp\n"); 148 } 149 150 if((ip_muxid = ioctl(ip_fd, I_LINK, if_fd)) < 0){ 151 syslog(LOG_ERR, "Can't link TAP device to IP"); 152 return -1; 153 } 154 155 if ((arp_muxid = ioctl (ip_fd, link_type, arp_fd)) < 0) 156 syslog (LOG_ERR, "Can't link TAP device to ARP"); 157 158 close (if_fd); 159 160 memset(&ifr, 0x0, sizeof(ifr)); 161 pstrcpy(ifr.lifr_name, sizeof(ifr.lifr_name), actual_name); 162 ifr.lifr_ip_muxid = ip_muxid; 163 ifr.lifr_arp_muxid = arp_muxid; 164 165 if (ioctl (ip_fd, SIOCSLIFMUXID, &ifr) < 0) 166 { 167 ioctl (ip_fd, I_PUNLINK , arp_muxid); 168 ioctl (ip_fd, I_PUNLINK, ip_muxid); 169 syslog (LOG_ERR, "Can't set multiplexor id"); 170 } 171 172 snprintf(dev, dev_size, "tap%d", ppa); 173 return tap_fd; 174 } 175 176 int tap_open(char *ifname, int ifname_size, int *vnet_hdr, 177 int vnet_hdr_required, int mq_required) 178 { 179 char dev[10]=""; 180 int fd; 181 if( (fd = tap_alloc(dev, sizeof(dev))) < 0 ){ 182 fprintf(stderr, "Cannot allocate TAP device\n"); 183 return -1; 184 } 185 pstrcpy(ifname, ifname_size, dev); 186 if (*vnet_hdr) { 187 /* Solaris doesn't have IFF_VNET_HDR */ 188 *vnet_hdr = 0; 189 190 if (vnet_hdr_required && !*vnet_hdr) { 191 error_report("vnet_hdr=1 requested, but no kernel " 192 "support for IFF_VNET_HDR available"); 193 close(fd); 194 return -1; 195 } 196 } 197 fcntl(fd, F_SETFL, O_NONBLOCK); 198 return fd; 199 } 200 201 int tap_set_sndbuf(int fd, const NetdevTapOptions *tap) 202 { 203 return 0; 204 } 205 206 int tap_probe_vnet_hdr(int fd) 207 { 208 return 0; 209 } 210 211 int tap_probe_has_ufo(int fd) 212 { 213 return 0; 214 } 215 216 int tap_probe_vnet_hdr_len(int fd, int len) 217 { 218 return 0; 219 } 220 221 void tap_fd_set_vnet_hdr_len(int fd, int len) 222 { 223 } 224 225 void tap_fd_set_offload(int fd, int csum, int tso4, 226 int tso6, int ecn, int ufo) 227 { 228 } 229 230 int tap_fd_enable(int fd) 231 { 232 return -1; 233 } 234 235 int tap_fd_disable(int fd) 236 { 237 return -1; 238 } 239 240 int tap_fd_get_ifname(int fd, char *ifname) 241 { 242 return -1; 243 } 244