/* * QEMU System Emulator * * Copyright (c) 2003-2008 Fabrice Bellard * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include "net/tap.h" #include "sysemu.h" #include <sys/stat.h> #include <sys/ethernet.h> #include <sys/sockio.h> #include <netinet/arp.h> #include <netinet/in.h> #include <netinet/in_systm.h> #include <netinet/ip.h> #include <netinet/ip_icmp.h> // must come after ip.h #include <netinet/udp.h> #include <netinet/tcp.h> #include <net/if.h> #include <syslog.h> #include <stropts.h> #include "qemu-error.h" ssize_t tap_read_packet(int tapfd, uint8_t *buf, int maxlen) { struct strbuf sbuf; int f = 0; sbuf.maxlen = maxlen; sbuf.buf = (char *)buf; return getmsg(tapfd, NULL, &sbuf, &f) >= 0 ? sbuf.len : -1; } #define TUNNEWPPA (('T'<<16) | 0x0001) /* * Allocate TAP device, returns opened fd. * Stores dev name in the first arg(must be large enough). */ static int tap_alloc(char *dev, size_t dev_size) { int tap_fd, if_fd, ppa = -1; static int ip_fd = 0; char *ptr; static int arp_fd = 0; int ip_muxid, arp_muxid; struct strioctl strioc_if, strioc_ppa; int link_type = I_PLINK;; struct lifreq ifr; char actual_name[32] = ""; memset(&ifr, 0x0, sizeof(ifr)); if( *dev ){ ptr = dev; while( *ptr && !qemu_isdigit((int)*ptr) ) ptr++; ppa = atoi(ptr); } /* Check if IP device was opened */ if( ip_fd ) close(ip_fd); TFR(ip_fd = open("/dev/udp", O_RDWR, 0)); if (ip_fd < 0) { syslog(LOG_ERR, "Can't open /dev/ip (actually /dev/udp)"); return -1; } TFR(tap_fd = open("/dev/tap", O_RDWR, 0)); if (tap_fd < 0) { syslog(LOG_ERR, "Can't open /dev/tap"); return -1; } /* Assign a new PPA and get its unit number. */ strioc_ppa.ic_cmd = TUNNEWPPA; strioc_ppa.ic_timout = 0; strioc_ppa.ic_len = sizeof(ppa); strioc_ppa.ic_dp = (char *)&ppa; if ((ppa = ioctl (tap_fd, I_STR, &strioc_ppa)) < 0) syslog (LOG_ERR, "Can't assign new interface"); TFR(if_fd = open("/dev/tap", O_RDWR, 0)); if (if_fd < 0) { syslog(LOG_ERR, "Can't open /dev/tap (2)"); return -1; } if(ioctl(if_fd, I_PUSH, "ip") < 0){ syslog(LOG_ERR, "Can't push IP module"); return -1; } if (ioctl(if_fd, SIOCGLIFFLAGS, &ifr) < 0) syslog(LOG_ERR, "Can't get flags\n"); snprintf (actual_name, 32, "tap%d", ppa); pstrcpy(ifr.lifr_name, sizeof(ifr.lifr_name), actual_name); ifr.lifr_ppa = ppa; /* Assign ppa according to the unit number returned by tun device */ if (ioctl (if_fd, SIOCSLIFNAME, &ifr) < 0) syslog (LOG_ERR, "Can't set PPA %d", ppa); if (ioctl(if_fd, SIOCGLIFFLAGS, &ifr) <0) syslog (LOG_ERR, "Can't get flags\n"); /* Push arp module to if_fd */ if (ioctl (if_fd, I_PUSH, "arp") < 0) syslog (LOG_ERR, "Can't push ARP module (2)"); /* Push arp module to ip_fd */ if (ioctl (ip_fd, I_POP, NULL) < 0) syslog (LOG_ERR, "I_POP failed\n"); if (ioctl (ip_fd, I_PUSH, "arp") < 0) syslog (LOG_ERR, "Can't push ARP module (3)\n"); /* Open arp_fd */ TFR(arp_fd = open ("/dev/tap", O_RDWR, 0)); if (arp_fd < 0) syslog (LOG_ERR, "Can't open %s\n", "/dev/tap"); /* Set ifname to arp */ strioc_if.ic_cmd = SIOCSLIFNAME; strioc_if.ic_timout = 0; strioc_if.ic_len = sizeof(ifr); strioc_if.ic_dp = (char *)𝔦 if (ioctl(arp_fd, I_STR, &strioc_if) < 0){ syslog (LOG_ERR, "Can't set ifname to arp\n"); } if((ip_muxid = ioctl(ip_fd, I_LINK, if_fd)) < 0){ syslog(LOG_ERR, "Can't link TAP device to IP"); return -1; } if ((arp_muxid = ioctl (ip_fd, link_type, arp_fd)) < 0) syslog (LOG_ERR, "Can't link TAP device to ARP"); close (if_fd); memset(&ifr, 0x0, sizeof(ifr)); pstrcpy(ifr.lifr_name, sizeof(ifr.lifr_name), actual_name); ifr.lifr_ip_muxid = ip_muxid; ifr.lifr_arp_muxid = arp_muxid; if (ioctl (ip_fd, SIOCSLIFMUXID, &ifr) < 0) { ioctl (ip_fd, I_PUNLINK , arp_muxid); ioctl (ip_fd, I_PUNLINK, ip_muxid); syslog (LOG_ERR, "Can't set multiplexor id"); } snprintf(dev, dev_size, "tap%d", ppa); return tap_fd; } int tap_open(char *ifname, int ifname_size, int *vnet_hdr, int vnet_hdr_required) { char dev[10]=""; int fd; if( (fd = tap_alloc(dev, sizeof(dev))) < 0 ){ fprintf(stderr, "Cannot allocate TAP device\n"); return -1; } pstrcpy(ifname, ifname_size, dev); if (*vnet_hdr) { /* Solaris doesn't have IFF_VNET_HDR */ *vnet_hdr = 0; if (vnet_hdr_required && !*vnet_hdr) { error_report("vnet_hdr=1 requested, but no kernel " "support for IFF_VNET_HDR available"); close(fd); return -1; } } fcntl(fd, F_SETFL, O_NONBLOCK); return fd; } int tap_set_sndbuf(int fd, QemuOpts *opts) { return 0; } int tap_probe_vnet_hdr(int fd) { return 0; } int tap_probe_has_ufo(int fd) { return 0; } int tap_probe_vnet_hdr_len(int fd, int len) { return 0; } void tap_fd_set_vnet_hdr_len(int fd, int len) { } void tap_fd_set_offload(int fd, int csum, int tso4, int tso6, int ecn, int ufo) { }