445d892f43
Add APIs to control host header length. First user will be vhost-net. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
228 lines
6.2 KiB
C
228 lines
6.2 KiB
C
/*
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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 "sysemu.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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#include "qemu-error.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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if (*vnet_hdr) {
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/* Solaris doesn't have IFF_VNET_HDR */
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*vnet_hdr = 0;
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if (vnet_hdr_required && !*vnet_hdr) {
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error_report("vnet_hdr=1 requested, but no kernel "
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"support for IFF_VNET_HDR available");
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close(fd);
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return -1;
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}
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}
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fcntl(fd, F_SETFL, O_NONBLOCK);
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return fd;
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}
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int tap_set_sndbuf(int fd, QemuOpts *opts)
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{
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return 0;
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}
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int tap_probe_vnet_hdr(int fd)
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{
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return 0;
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}
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int tap_probe_has_ufo(int fd)
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{
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return 0;
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}
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int tap_probe_vnet_hdr_len(int fd, int len)
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{
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return 0;
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}
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void tap_fd_set_vnet_hdr_len(int fd, int len)
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{
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}
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void tap_fd_set_offload(int fd, int csum, int tso4,
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int tso6, int ecn, int ufo)
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{
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}
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