4 * Copyright (c) 2003-2008 Fabrice Bellard
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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
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>
42 ssize_t tap_read_packet(int tapfd, uint8_t *buf, int maxlen)
48 sbuf.buf = (char *)buf;
50 return getmsg(tapfd, NULL, &sbuf, &f) >= 0 ? sbuf.len : -1;
53 #define TUNNEWPPA (('T'<<16) | 0x0001)
55 * Allocate TAP device, returns opened fd.
56 * Stores dev name in the first arg(must be large enough).
58 static int tap_alloc(char *dev, size_t dev_size)
60 int tap_fd, if_fd, ppa = -1;
64 static int arp_fd = 0;
65 int ip_muxid, arp_muxid;
66 struct strioctl strioc_if, strioc_ppa;
67 int link_type = I_PLINK;;
69 char actual_name[32] = "";
71 memset(&ifr, 0x0, sizeof(ifr));
75 while( *ptr && !qemu_isdigit((int)*ptr) ) ptr++;
79 /* Check if IP device was opened */
83 TFR(ip_fd = open("/dev/udp", O_RDWR, 0));
85 syslog(LOG_ERR, "Can't open /dev/ip (actually /dev/udp)");
89 TFR(tap_fd = open("/dev/tap", O_RDWR, 0));
91 syslog(LOG_ERR, "Can't open /dev/tap");
95 /* Assign a new PPA and get its unit number. */
96 strioc_ppa.ic_cmd = TUNNEWPPA;
97 strioc_ppa.ic_timout = 0;
98 strioc_ppa.ic_len = sizeof(ppa);
99 strioc_ppa.ic_dp = (char *)&ppa;
100 if ((ppa = ioctl (tap_fd, I_STR, &strioc_ppa)) < 0)
101 syslog (LOG_ERR, "Can't assign new interface");
103 TFR(if_fd = open("/dev/tap", O_RDWR, 0));
105 syslog(LOG_ERR, "Can't open /dev/tap (2)");
108 if(ioctl(if_fd, I_PUSH, "ip") < 0){
109 syslog(LOG_ERR, "Can't push IP module");
113 if (ioctl(if_fd, SIOCGLIFFLAGS, &ifr) < 0)
114 syslog(LOG_ERR, "Can't get flags\n");
116 snprintf (actual_name, 32, "tap%d", ppa);
117 pstrcpy(ifr.lifr_name, sizeof(ifr.lifr_name), actual_name);
120 /* Assign ppa according to the unit number returned by tun device */
122 if (ioctl (if_fd, SIOCSLIFNAME, &ifr) < 0)
123 syslog (LOG_ERR, "Can't set PPA %d", ppa);
124 if (ioctl(if_fd, SIOCGLIFFLAGS, &ifr) <0)
125 syslog (LOG_ERR, "Can't get flags\n");
126 /* Push arp module to if_fd */
127 if (ioctl (if_fd, I_PUSH, "arp") < 0)
128 syslog (LOG_ERR, "Can't push ARP module (2)");
130 /* Push arp module to ip_fd */
131 if (ioctl (ip_fd, I_POP, NULL) < 0)
132 syslog (LOG_ERR, "I_POP failed\n");
133 if (ioctl (ip_fd, I_PUSH, "arp") < 0)
134 syslog (LOG_ERR, "Can't push ARP module (3)\n");
136 TFR(arp_fd = open ("/dev/tap", O_RDWR, 0));
138 syslog (LOG_ERR, "Can't open %s\n", "/dev/tap");
140 /* Set ifname to arp */
141 strioc_if.ic_cmd = SIOCSLIFNAME;
142 strioc_if.ic_timout = 0;
143 strioc_if.ic_len = sizeof(ifr);
144 strioc_if.ic_dp = (char *)𝔦
145 if (ioctl(arp_fd, I_STR, &strioc_if) < 0){
146 syslog (LOG_ERR, "Can't set ifname to arp\n");
149 if((ip_muxid = ioctl(ip_fd, I_LINK, if_fd)) < 0){
150 syslog(LOG_ERR, "Can't link TAP device to IP");
154 if ((arp_muxid = ioctl (ip_fd, link_type, arp_fd)) < 0)
155 syslog (LOG_ERR, "Can't link TAP device to ARP");
159 memset(&ifr, 0x0, sizeof(ifr));
160 pstrcpy(ifr.lifr_name, sizeof(ifr.lifr_name), actual_name);
161 ifr.lifr_ip_muxid = ip_muxid;
162 ifr.lifr_arp_muxid = arp_muxid;
164 if (ioctl (ip_fd, SIOCSLIFMUXID, &ifr) < 0)
166 ioctl (ip_fd, I_PUNLINK , arp_muxid);
167 ioctl (ip_fd, I_PUNLINK, ip_muxid);
168 syslog (LOG_ERR, "Can't set multiplexor id");
171 snprintf(dev, dev_size, "tap%d", ppa);
175 int tap_open(char *ifname, int ifname_size, int *vnet_hdr, int vnet_hdr_required)
179 if( (fd = tap_alloc(dev, sizeof(dev))) < 0 ){
180 fprintf(stderr, "Cannot allocate TAP device\n");
183 pstrcpy(ifname, ifname_size, dev);
185 /* Solaris doesn't have IFF_VNET_HDR */
188 if (vnet_hdr_required && !*vnet_hdr) {
189 error_report("vnet_hdr=1 requested, but no kernel "
190 "support for IFF_VNET_HDR available");
195 fcntl(fd, F_SETFL, O_NONBLOCK);
199 int tap_set_sndbuf(int fd, QemuOpts *opts)
204 int tap_probe_vnet_hdr(int fd)
209 int tap_probe_has_ufo(int fd)
214 void tap_fd_set_offload(int fd, int csum, int tso4,
215 int tso6, int ecn, int ufo)