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Signed-off-by: Mark McLoughlin <markmc@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>remotes/github/stable-0.12
Mark McLoughlin
17 years ago
committed by
Anthony Liguori
Anthony Liguori
4 changed files with 191 additions and 165 deletions
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/*
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* QEMU System Emulator |
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* |
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* Copyright (c) 2003-2008 Fabrice Bellard |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining a copy |
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* of this software and associated documentation files (the "Software"), to deal |
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* in the Software without restriction, including without limitation the rights |
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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* copies of the Software, and to permit persons to whom the Software is |
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* furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included in |
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* all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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* THE SOFTWARE. |
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*/ |
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#include "net/tap.h" |
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#include <sys/stat.h> |
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#include <sys/ethernet.h> |
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#include <sys/sockio.h> |
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#include <netinet/arp.h> |
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#include <netinet/in.h> |
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#include <netinet/in_systm.h> |
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#include <netinet/ip.h> |
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#include <netinet/ip_icmp.h> // must come after ip.h |
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#include <netinet/udp.h> |
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#include <netinet/tcp.h> |
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#include <net/if.h> |
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#include <syslog.h> |
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#include <stropts.h> |
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ssize_t tap_read_packet(int tapfd, uint8_t *buf, int maxlen) |
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{ |
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struct strbuf sbuf; |
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int f = 0; |
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sbuf.maxlen = maxlen; |
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sbuf.buf = (char *)buf; |
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return getmsg(tapfd, NULL, &sbuf, &f) >= 0 ? sbuf.len : -1; |
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} |
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#define TUNNEWPPA (('T'<<16) | 0x0001) |
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/*
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* Allocate TAP device, returns opened fd. |
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* Stores dev name in the first arg(must be large enough). |
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*/ |
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static int tap_alloc(char *dev, size_t dev_size) |
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{ |
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int tap_fd, if_fd, ppa = -1; |
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static int ip_fd = 0; |
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char *ptr; |
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static int arp_fd = 0; |
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int ip_muxid, arp_muxid; |
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struct strioctl strioc_if, strioc_ppa; |
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int link_type = I_PLINK;; |
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struct lifreq ifr; |
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char actual_name[32] = ""; |
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memset(&ifr, 0x0, sizeof(ifr)); |
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if( *dev ){ |
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ptr = dev; |
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while( *ptr && !qemu_isdigit((int)*ptr) ) ptr++; |
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ppa = atoi(ptr); |
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} |
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/* Check if IP device was opened */ |
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if( ip_fd ) |
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close(ip_fd); |
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TFR(ip_fd = open("/dev/udp", O_RDWR, 0)); |
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if (ip_fd < 0) { |
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syslog(LOG_ERR, "Can't open /dev/ip (actually /dev/udp)"); |
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return -1; |
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} |
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TFR(tap_fd = open("/dev/tap", O_RDWR, 0)); |
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if (tap_fd < 0) { |
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syslog(LOG_ERR, "Can't open /dev/tap"); |
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return -1; |
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} |
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/* Assign a new PPA and get its unit number. */ |
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strioc_ppa.ic_cmd = TUNNEWPPA; |
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strioc_ppa.ic_timout = 0; |
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strioc_ppa.ic_len = sizeof(ppa); |
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strioc_ppa.ic_dp = (char *)&ppa; |
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if ((ppa = ioctl (tap_fd, I_STR, &strioc_ppa)) < 0) |
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syslog (LOG_ERR, "Can't assign new interface"); |
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TFR(if_fd = open("/dev/tap", O_RDWR, 0)); |
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if (if_fd < 0) { |
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syslog(LOG_ERR, "Can't open /dev/tap (2)"); |
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return -1; |
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} |
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if(ioctl(if_fd, I_PUSH, "ip") < 0){ |
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syslog(LOG_ERR, "Can't push IP module"); |
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return -1; |
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} |
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if (ioctl(if_fd, SIOCGLIFFLAGS, &ifr) < 0) |
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syslog(LOG_ERR, "Can't get flags\n"); |
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snprintf (actual_name, 32, "tap%d", ppa); |
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pstrcpy(ifr.lifr_name, sizeof(ifr.lifr_name), actual_name); |
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ifr.lifr_ppa = ppa; |
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/* Assign ppa according to the unit number returned by tun device */ |
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if (ioctl (if_fd, SIOCSLIFNAME, &ifr) < 0) |
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syslog (LOG_ERR, "Can't set PPA %d", ppa); |
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if (ioctl(if_fd, SIOCGLIFFLAGS, &ifr) <0) |
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syslog (LOG_ERR, "Can't get flags\n"); |
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/* Push arp module to if_fd */ |
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if (ioctl (if_fd, I_PUSH, "arp") < 0) |
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syslog (LOG_ERR, "Can't push ARP module (2)"); |
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/* Push arp module to ip_fd */ |
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if (ioctl (ip_fd, I_POP, NULL) < 0) |
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syslog (LOG_ERR, "I_POP failed\n"); |
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if (ioctl (ip_fd, I_PUSH, "arp") < 0) |
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syslog (LOG_ERR, "Can't push ARP module (3)\n"); |
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/* Open arp_fd */ |
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TFR(arp_fd = open ("/dev/tap", O_RDWR, 0)); |
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if (arp_fd < 0) |
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syslog (LOG_ERR, "Can't open %s\n", "/dev/tap"); |
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/* Set ifname to arp */ |
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strioc_if.ic_cmd = SIOCSLIFNAME; |
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strioc_if.ic_timout = 0; |
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strioc_if.ic_len = sizeof(ifr); |
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strioc_if.ic_dp = (char *)𝔦 |
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if (ioctl(arp_fd, I_STR, &strioc_if) < 0){ |
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syslog (LOG_ERR, "Can't set ifname to arp\n"); |
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} |
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if((ip_muxid = ioctl(ip_fd, I_LINK, if_fd)) < 0){ |
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syslog(LOG_ERR, "Can't link TAP device to IP"); |
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return -1; |
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} |
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if ((arp_muxid = ioctl (ip_fd, link_type, arp_fd)) < 0) |
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syslog (LOG_ERR, "Can't link TAP device to ARP"); |
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close (if_fd); |
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memset(&ifr, 0x0, sizeof(ifr)); |
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pstrcpy(ifr.lifr_name, sizeof(ifr.lifr_name), actual_name); |
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ifr.lifr_ip_muxid = ip_muxid; |
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ifr.lifr_arp_muxid = arp_muxid; |
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if (ioctl (ip_fd, SIOCSLIFMUXID, &ifr) < 0) |
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{ |
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ioctl (ip_fd, I_PUNLINK , arp_muxid); |
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ioctl (ip_fd, I_PUNLINK, ip_muxid); |
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syslog (LOG_ERR, "Can't set multiplexor id"); |
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} |
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snprintf(dev, dev_size, "tap%d", ppa); |
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return tap_fd; |
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} |
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int tap_open(char *ifname, int ifname_size, int *vnet_hdr, int vnet_hdr_required) |
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{ |
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char dev[10]=""; |
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int fd; |
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if( (fd = tap_alloc(dev, sizeof(dev))) < 0 ){ |
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fprintf(stderr, "Cannot allocate TAP device\n"); |
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return -1; |
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} |
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pstrcpy(ifname, ifname_size, dev); |
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fcntl(fd, F_SETFL, O_NONBLOCK); |
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return fd; |
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} |
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