diff options
| -rw-r--r-- | Makefile | 1 | ||||
| -rw-r--r-- | net.c | 692 | ||||
| -rw-r--r-- | net.h | 2 | ||||
| -rw-r--r-- | net/tap.c | 759 |
4 files changed, 763 insertions, 691 deletions
@@ -88,6 +88,7 @@ block-obj-y += $(addprefix block/, $(block-nested-y)) net-obj-y = net.o net-nested-y = queue.o checksum.o +net-nested-$(CONFIG_POSIX) += tap.o net-nested-$(CONFIG_WIN32) += tap-win32.o net-obj-y += $(addprefix net/, $(net-nested-y)) @@ -42,12 +42,6 @@ #include <sys/socket.h> #include <netinet/in.h> #include <net/if.h> -#ifdef __NetBSD__ -#include <net/if_tap.h> -#endif -#ifdef __linux__ -#include "net/tap-linux.h" -#endif #include <arpa/inet.h> #include <dirent.h> #include <netdb.h> @@ -1295,618 +1289,6 @@ void do_info_usernet(Monitor *mon) #endif /* CONFIG_SLIRP */ -#if !defined(_WIN32) && !defined(_AIX) - -/* Maximum GSO packet size (64k) plus plenty of room for - * the ethernet and virtio_net headers - */ -#define TAP_BUFSIZE (4096 + 65536) - -typedef struct TAPState { - VLANClientState *vc; - int fd; - char down_script[1024]; - char down_script_arg[128]; - uint8_t buf[TAP_BUFSIZE]; - unsigned int read_poll : 1; - unsigned int write_poll : 1; - unsigned int has_vnet_hdr : 1; - unsigned int using_vnet_hdr : 1; - unsigned int has_ufo: 1; -} TAPState; - -static int launch_script(const char *setup_script, const char *ifname, int fd); - -static int tap_can_send(void *opaque); -static void tap_send(void *opaque); -static void tap_writable(void *opaque); - -static void tap_update_fd_handler(TAPState *s) -{ - qemu_set_fd_handler2(s->fd, - s->read_poll ? tap_can_send : NULL, - s->read_poll ? tap_send : NULL, - s->write_poll ? tap_writable : NULL, - s); -} - -static void tap_read_poll(TAPState *s, int enable) -{ - s->read_poll = !!enable; - tap_update_fd_handler(s); -} - -static void tap_write_poll(TAPState *s, int enable) -{ - s->write_poll = !!enable; - tap_update_fd_handler(s); -} - -static void tap_writable(void *opaque) -{ - TAPState *s = opaque; - - tap_write_poll(s, 0); - - qemu_flush_queued_packets(s->vc); -} - -static ssize_t tap_write_packet(TAPState *s, const struct iovec *iov, int iovcnt) -{ - ssize_t len; - - do { - len = writev(s->fd, iov, iovcnt); - } while (len == -1 && errno == EINTR); - - if (len == -1 && errno == EAGAIN) { - tap_write_poll(s, 1); - return 0; - } - - return len; -} - -static ssize_t tap_receive_iov(VLANClientState *vc, const struct iovec *iov, - int iovcnt) -{ - TAPState *s = vc->opaque; - const struct iovec *iovp = iov; - struct iovec iov_copy[iovcnt + 1]; - struct virtio_net_hdr hdr = { 0, }; - - if (s->has_vnet_hdr && !s->using_vnet_hdr) { - iov_copy[0].iov_base = &hdr; - iov_copy[0].iov_len = sizeof(hdr); - memcpy(&iov_copy[1], iov, iovcnt * sizeof(*iov)); - iovp = iov_copy; - iovcnt++; - } - - return tap_write_packet(s, iovp, iovcnt); -} - -static ssize_t tap_receive_raw(VLANClientState *vc, const uint8_t *buf, size_t size) -{ - TAPState *s = vc->opaque; - struct iovec iov[2]; - int iovcnt = 0; - struct virtio_net_hdr hdr = { 0, }; - - if (s->has_vnet_hdr) { - iov[iovcnt].iov_base = &hdr; - iov[iovcnt].iov_len = sizeof(hdr); - iovcnt++; - } - - iov[iovcnt].iov_base = (char *)buf; - iov[iovcnt].iov_len = size; - iovcnt++; - - return tap_write_packet(s, iov, iovcnt); -} - -static ssize_t tap_receive(VLANClientState *vc, const uint8_t *buf, size_t size) -{ - TAPState *s = vc->opaque; - struct iovec iov[1]; - - if (s->has_vnet_hdr && !s->using_vnet_hdr) { - return tap_receive_raw(vc, buf, size); - } - - iov[0].iov_base = (char *)buf; - iov[0].iov_len = size; - - return tap_write_packet(s, iov, 1); -} - -static int tap_can_send(void *opaque) -{ - TAPState *s = opaque; - - return qemu_can_send_packet(s->vc); -} - -#ifdef __sun__ -static 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; -} -#else -static ssize_t tap_read_packet(int tapfd, uint8_t *buf, int maxlen) -{ - return read(tapfd, buf, maxlen); -} -#endif - -static void tap_send_completed(VLANClientState *vc, ssize_t len) -{ - TAPState *s = vc->opaque; - tap_read_poll(s, 1); -} - -static void tap_send(void *opaque) -{ - TAPState *s = opaque; - int size; - - do { - uint8_t *buf = s->buf; - - size = tap_read_packet(s->fd, s->buf, sizeof(s->buf)); - if (size <= 0) { - break; - } - - if (s->has_vnet_hdr && !s->using_vnet_hdr) { - buf += sizeof(struct virtio_net_hdr); - size -= sizeof(struct virtio_net_hdr); - } - - size = qemu_send_packet_async(s->vc, buf, size, tap_send_completed); - if (size == 0) { - tap_read_poll(s, 0); - } - } while (size > 0); -} - -/* sndbuf should be set to a value lower than the tx queue - * capacity of any destination network interface. - * Ethernet NICs generally have txqueuelen=1000, so 1Mb is - * a good default, given a 1500 byte MTU. - */ -#define TAP_DEFAULT_SNDBUF 1024*1024 - -static int tap_set_sndbuf(TAPState *s, QemuOpts *opts) -{ - int sndbuf; - - sndbuf = qemu_opt_get_size(opts, "sndbuf", TAP_DEFAULT_SNDBUF); - if (!sndbuf) { - sndbuf = INT_MAX; - } - - if (ioctl(s->fd, TUNSETSNDBUF, &sndbuf) == -1 && qemu_opt_get(opts, "sndbuf")) { - qemu_error("TUNSETSNDBUF ioctl failed: %s\n", strerror(errno)); - return -1; - } - return 0; -} - -int tap_has_ufo(VLANClientState *vc) -{ - TAPState *s = vc->opaque; - - assert(vc->type == NET_CLIENT_TYPE_TAP); - - return s->has_ufo; -} - -int tap_has_vnet_hdr(VLANClientState *vc) -{ - TAPState *s = vc->opaque; - - assert(vc->type == NET_CLIENT_TYPE_TAP); - - return s->has_vnet_hdr; -} - -void tap_using_vnet_hdr(VLANClientState *vc, int using_vnet_hdr) -{ - TAPState *s = vc->opaque; - - using_vnet_hdr = using_vnet_hdr != 0; - - assert(vc->type == NET_CLIENT_TYPE_TAP); - assert(s->has_vnet_hdr == using_vnet_hdr); - - s->using_vnet_hdr = using_vnet_hdr; -} - -static int tap_probe_vnet_hdr(int fd) -{ - struct ifreq ifr; - - if (ioctl(fd, TUNGETIFF, &ifr) != 0) { - qemu_error("TUNGETIFF ioctl() failed: %s\n", strerror(errno)); - return 0; - } - - return ifr.ifr_flags & IFF_VNET_HDR; -} - -void tap_set_offload(VLANClientState *vc, int csum, int tso4, - int tso6, int ecn, int ufo) -{ - TAPState *s = vc->opaque; - unsigned int offload = 0; - - if (csum) { - offload |= TUN_F_CSUM; - if (tso4) - offload |= TUN_F_TSO4; - if (tso6) - offload |= TUN_F_TSO6; - if ((tso4 || tso6) && ecn) - offload |= TUN_F_TSO_ECN; - if (ufo) - offload |= TUN_F_UFO; - } - - if (ioctl(s->fd, TUNSETOFFLOAD, offload) != 0) { - offload &= ~TUN_F_UFO; - if (ioctl(s->fd, TUNSETOFFLOAD, offload) != 0) { - fprintf(stderr, "TUNSETOFFLOAD ioctl() failed: %s\n", - strerror(errno)); - } - } -} - -static void tap_cleanup(VLANClientState *vc) -{ - TAPState *s = vc->opaque; - - qemu_purge_queued_packets(vc); - - if (s->down_script[0]) - launch_script(s->down_script, s->down_script_arg, s->fd); - - tap_read_poll(s, 0); - tap_write_poll(s, 0); - close(s->fd); - qemu_free(s); -} - -/* fd support */ - -static TAPState *net_tap_fd_init(VLANState *vlan, - const char *model, - const char *name, - int fd, - int vnet_hdr) -{ - TAPState *s; - unsigned int offload; - - s = qemu_mallocz(sizeof(TAPState)); - s->fd = fd; - s->has_vnet_hdr = vnet_hdr != 0; - s->using_vnet_hdr = 0; - s->vc = qemu_new_vlan_client(NET_CLIENT_TYPE_TAP, - vlan, NULL, model, name, NULL, - tap_receive, tap_receive_raw, - tap_receive_iov, tap_cleanup, s); - s->has_ufo = 0; - /* Check if tap supports UFO */ - offload = TUN_F_CSUM | TUN_F_UFO; - if (ioctl(s->fd, TUNSETOFFLOAD, offload) == 0) - s->has_ufo = 1; - tap_set_offload(s->vc, 0, 0, 0, 0, 0); - tap_read_poll(s, 1); - return s; -} - -#if defined (CONFIG_BSD) || defined (__FreeBSD_kernel__) -static int tap_open(char *ifname, int ifname_size, - int *vnet_hdr, int vnet_hdr_required) -{ - int fd; - char *dev; - struct stat s; - - TFR(fd = open("/dev/tap", O_RDWR)); - if (fd < 0) { - fprintf(stderr, "warning: could not open /dev/tap: no virtual network emulation\n"); - return -1; - } - - fstat(fd, &s); - dev = devname(s.st_rdev, S_IFCHR); - pstrcpy(ifname, ifname_size, dev); - - fcntl(fd, F_SETFL, O_NONBLOCK); - return fd; -} -#elif defined(__sun__) -#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; -} - -static 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); - fcntl(fd, F_SETFL, O_NONBLOCK); - return fd; -} -#elif defined (_AIX) -static int tap_open(char *ifname, int ifname_size, - int *vnet_hdr, int vnet_hdr_required) -{ - fprintf (stderr, "no tap on AIX\n"); - return -1; -} -#else -static int tap_open(char *ifname, int ifname_size, - int *vnet_hdr, int vnet_hdr_required) -{ - struct ifreq ifr; - int fd, ret; - - TFR(fd = open("/dev/net/tun", O_RDWR)); - if (fd < 0) { - fprintf(stderr, "warning: could not open /dev/net/tun: no virtual network emulation\n"); - return -1; - } - memset(&ifr, 0, sizeof(ifr)); - ifr.ifr_flags = IFF_TAP | IFF_NO_PI; - - if (*vnet_hdr) { - unsigned int features; - - if (ioctl(fd, TUNGETFEATURES, &features) == 0 && - features & IFF_VNET_HDR) { - *vnet_hdr = 1; - ifr.ifr_flags |= IFF_VNET_HDR; - } - - if (vnet_hdr_required && !*vnet_hdr) { - qemu_error("vnet_hdr=1 requested, but no kernel " - "support for IFF_VNET_HDR available"); - close(fd); - return -1; - } - } - - if (ifname[0] != '\0') - pstrcpy(ifr.ifr_name, IFNAMSIZ, ifname); - else - pstrcpy(ifr.ifr_name, IFNAMSIZ, "tap%d"); - ret = ioctl(fd, TUNSETIFF, (void *) &ifr); - if (ret != 0) { - fprintf(stderr, "warning: could not configure /dev/net/tun: no virtual network emulation\n"); - close(fd); - return -1; - } - pstrcpy(ifname, ifname_size, ifr.ifr_name); - fcntl(fd, F_SETFL, O_NONBLOCK); - return fd; -} -#endif - -static int launch_script(const char *setup_script, const char *ifname, int fd) -{ - sigset_t oldmask, mask; - int pid, status; - char *args[3]; - char **parg; - - sigemptyset(&mask); - sigaddset(&mask, SIGCHLD); - sigprocmask(SIG_BLOCK, &mask, &oldmask); - - /* try to launch network script */ - pid = fork(); - if (pid == 0) { - int open_max = sysconf(_SC_OPEN_MAX), i; - - for (i = 0; i < open_max; i++) { - if (i != STDIN_FILENO && - i != STDOUT_FILENO && - i != STDERR_FILENO && - i != fd) { - close(i); - } - } - parg = args; - *parg++ = (char *)setup_script; - *parg++ = (char *)ifname; - *parg++ = NULL; - execv(setup_script, args); - _exit(1); - } else if (pid > 0) { - while (waitpid(pid, &status, 0) != pid) { - /* loop */ - } - sigprocmask(SIG_SETMASK, &oldmask, NULL); - - if (WIFEXITED(status) && WEXITSTATUS(status) == 0) { - return 0; - } - } - fprintf(stderr, "%s: could not launch network script\n", setup_script); - return -1; -} - -static int net_tap_init(QemuOpts *opts, int *vnet_hdr) -{ - int fd, vnet_hdr_required; - char ifname[128] = {0,}; - const char *setup_script; - - if (qemu_opt_get(opts, "ifname")) { - pstrcpy(ifname, sizeof(ifname), qemu_opt_get(opts, "ifname")); - } - - *vnet_hdr = qemu_opt_get_bool(opts, "vnet_hdr", 1); - if (qemu_opt_get(opts, "vnet_hdr")) { - vnet_hdr_required = *vnet_hdr; - } else { - vnet_hdr_required = 0; - } - - TFR(fd = tap_open(ifname, sizeof(ifname), vnet_hdr, vnet_hdr_required)); - if (fd < 0) { - return -1; - } - - setup_script = qemu_opt_get(opts, "script"); - if (setup_script && - setup_script[0] != '\0' && - strcmp(setup_script, "no") != 0 && - launch_script(setup_script, ifname, fd)) { - close(fd); - return -1; - } - - qemu_opt_set(opts, "ifname", ifname); - - return fd; -} - -#endif /* !defined(_WIN32) && !defined(_AIX) */ - #if defined(CONFIG_VDE) typedef struct VDEState { VLANClientState *vc; @@ -2622,7 +2004,7 @@ int qemu_find_nic_model(NICInfo *nd, const char * const *models, return -1; } -static int net_handle_fd_param(Monitor *mon, const char *param) +int net_handle_fd_param(Monitor *mon, const char *param) { if (!qemu_isdigit(param[0])) { int fd; @@ -2802,78 +2184,6 @@ static int net_init_slirp(QemuOpts *opts, } #endif /* CONFIG_SLIRP */ -#if !defined(_WIN32) && !defined(_AIX) -int net_init_tap(QemuOpts *opts, Monitor *mon, const char *name, VLANState *vlan) -{ - TAPState *s; - int fd, vnet_hdr; - - if (qemu_opt_get(opts, "fd")) { - if (qemu_opt_get(opts, "ifname") || - qemu_opt_get(opts, "script") || - qemu_opt_get(opts, "downscript") || - qemu_opt_get(opts, "vnet_hdr")) { - qemu_error("ifname=, script=, downscript= and vnet_hdr= is invalid with fd=\n"); - return -1; - } - - fd = net_handle_fd_param(mon, qemu_opt_get(opts, "fd")); - if (fd == -1) { - return -1; - } - - fcntl(fd, F_SETFL, O_NONBLOCK); - - vnet_hdr = tap_probe_vnet_hdr(fd); - } else { - if (!qemu_opt_get(opts, "script")) { - qemu_opt_set(opts, "script", DEFAULT_NETWORK_SCRIPT); - } - - if (!qemu_opt_get(opts, "downscript")) { - qemu_opt_set(opts, "downscript", DEFAULT_NETWORK_DOWN_SCRIPT); - } - - fd = net_tap_init(opts, &vnet_hdr); - } - - s = net_tap_fd_init(vlan, "tap", name, fd, vnet_hdr); - if (!s) { - close(fd); - return -1; - } - - if (tap_set_sndbuf(s, opts) < 0) { - return -1; - } - - if (qemu_opt_get(opts, "fd")) { - snprintf(s->vc->info_str, sizeof(s->vc->info_str), "fd=%d", fd); - } else { - const char *ifname, *script, *downscript; - - ifname = qemu_opt_get(opts, "ifname"); - script = qemu_opt_get(opts, "script"); - downscript = qemu_opt_get(opts, "downscript"); - - snprintf(s->vc->info_str, sizeof(s->vc->info_str), - "ifname=%s,script=%s,downscript=%s", - ifname, script, downscript); - - if (strcmp(downscript, "no") != 0) { - snprintf(s->down_script, sizeof(s->down_script), "%s", downscript); - snprintf(s->down_script_arg, sizeof(s->down_script_arg), "%s", ifname); - } - } - - if (vlan) { - vlan->nb_host_devs++; - } - - return 0; -} -#endif /* !defined(_WIN32) && !defined(_AIX) */ - static int net_init_socket(QemuOpts *opts, Monitor *mon, const char *name, @@ -174,4 +174,6 @@ void net_host_device_remove(Monitor *mon, const QDict *qdict); void qdev_set_nic_properties(DeviceState *dev, NICInfo *nd); +int net_handle_fd_param(Monitor *mon, const char *param); + #endif diff --git a/net/tap.c b/net/tap.c new file mode 100644 index 0000000000..6b43d808d2 --- /dev/null +++ b/net/tap.c @@ -0,0 +1,759 @@ +/* + * QEMU System Emulator + * + * Copyright (c) 2003-2008 Fabrice Bellard + * Copyright (c) 2009 Red Hat, Inc. + * + * 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 "config-host.h" + +#include <signal.h> +#include <sys/ioctl.h> +#include <sys/stat.h> +#include <sys/wait.h> +#include <net/if.h> + +#include "net.h" +#include "sysemu.h" +#include "qemu-char.h" +#include "qemu-common.h" + +#ifdef __linux__ +#include "net/tap-linux.h" +#endif + +#ifdef __NetBSD__ +#include <net/if_tap.h> +#endif + +#ifdef CONFIG_BSD +#if defined(__FreeBSD__) || defined(__DragonFly__) +#include <libutil.h> +#else +#include <util.h> +#endif +#elif defined (__GLIBC__) && defined (__FreeBSD_kernel__) +#include <freebsd/stdlib.h> +#endif + +#if defined(__OpenBSD__) +#include <util.h> +#endif + +#ifdef __sun__ +#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> +#endif + +#if !defined(_AIX) + +/* Maximum GSO packet size (64k) plus plenty of room for + * the ethernet and virtio_net headers + */ +#define TAP_BUFSIZE (4096 + 65536) + +typedef struct TAPState { + VLANClientState *vc; + int fd; + char down_script[1024]; + char down_script_arg[128]; + uint8_t buf[TAP_BUFSIZE]; + unsigned int read_poll : 1; + unsigned int write_poll : 1; + unsigned int has_vnet_hdr : 1; + unsigned int using_vnet_hdr : 1; + unsigned int has_ufo: 1; +} TAPState; + +static int launch_script(const char *setup_script, const char *ifname, int fd); + +static int tap_can_send(void *opaque); +static void tap_send(void *opaque); +static void tap_writable(void *opaque); + +static void tap_update_fd_handler(TAPState *s) +{ + qemu_set_fd_handler2(s->fd, + s->read_poll ? tap_can_send : NULL, + s->read_poll ? tap_send : NULL, + s->write_poll ? tap_writable : NULL, + s); +} + +static void tap_read_poll(TAPState *s, int enable) +{ + s->read_poll = !!enable; + tap_update_fd_handler(s); +} + +static void tap_write_poll(TAPState *s, int enable) +{ + s->write_poll = !!enable; + tap_update_fd_handler(s); +} + +static void tap_writable(void *opaque) +{ + TAPState *s = opaque; + + tap_write_poll(s, 0); + + qemu_flush_queued_packets(s->vc); +} + +static ssize_t tap_write_packet(TAPState *s, const struct iovec *iov, int iovcnt) +{ + ssize_t len; + + do { + len = writev(s->fd, iov, iovcnt); + } while (len == -1 && errno == EINTR); + + if (len == -1 && errno == EAGAIN) { + tap_write_poll(s, 1); + return 0; + } + + return len; +} + +static ssize_t tap_receive_iov(VLANClientState *vc, const struct iovec *iov, + int iovcnt) +{ + TAPState *s = vc->opaque; + const struct iovec *iovp = iov; + struct iovec iov_copy[iovcnt + 1]; + struct virtio_net_hdr hdr = { 0, }; + + if (s->has_vnet_hdr && !s->using_vnet_hdr) { + iov_copy[0].iov_base = &hdr; + iov_copy[0].iov_len = sizeof(hdr); + memcpy(&iov_copy[1], iov, iovcnt * sizeof(*iov)); + iovp = iov_copy; + iovcnt++; + } + + return tap_write_packet(s, iovp, iovcnt); +} + +static ssize_t tap_receive_raw(VLANClientState *vc, const uint8_t *buf, size_t size) +{ + TAPState *s = vc->opaque; + struct iovec iov[2]; + int iovcnt = 0; + struct virtio_net_hdr hdr = { 0, }; + + if (s->has_vnet_hdr) { + iov[iovcnt].iov_base = &hdr; + iov[iovcnt].iov_len = sizeof(hdr); + iovcnt++; + } + + iov[iovcnt].iov_base = (char *)buf; + iov[iovcnt].iov_len = size; + iovcnt++; + + return tap_write_packet(s, iov, iovcnt); +} + +static ssize_t tap_receive(VLANClientState *vc, const uint8_t *buf, size_t size) +{ + TAPState *s = vc->opaque; + struct iovec iov[1]; + + if (s->has_vnet_hdr && !s->using_vnet_hdr) { + return tap_receive_raw(vc, buf, size); + } + + iov[0].iov_base = (char *)buf; + iov[0].iov_len = size; + + return tap_write_packet(s, iov, 1); +} + +static int tap_can_send(void *opaque) +{ + TAPState *s = opaque; + + return qemu_can_send_packet(s->vc); +} + +#ifdef __sun__ +static 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; +} +#else +static ssize_t tap_read_packet(int tapfd, uint8_t *buf, int maxlen) +{ + return read(tapfd, buf, maxlen); +} +#endif + +static void tap_send_completed(VLANClientState *vc, ssize_t len) +{ + TAPState *s = vc->opaque; + tap_read_poll(s, 1); +} + +static void tap_send(void *opaque) +{ + TAPState *s = opaque; + int size; + + do { + uint8_t *buf = s->buf; + + size = tap_read_packet(s->fd, s->buf, sizeof(s->buf)); + if (size <= 0) { + break; + } + + if (s->has_vnet_hdr && !s->using_vnet_hdr) { + buf += sizeof(struct virtio_net_hdr); + size -= sizeof(struct virtio_net_hdr); + } + + size = qemu_send_packet_async(s->vc, buf, size, tap_send_completed); + if (size == 0) { + tap_read_poll(s, 0); + } + } while (size > 0); +} + +/* sndbuf should be set to a value lower than the tx queue + * capacity of any destination network interface. + * Ethernet NICs generally have txqueuelen=1000, so 1Mb is + * a good default, given a 1500 byte MTU. + */ +#define TAP_DEFAULT_SNDBUF 1024*1024 + +static int tap_set_sndbuf(TAPState *s, QemuOpts *opts) +{ + int sndbuf; + + sndbuf = qemu_opt_get_size(opts, "sndbuf", TAP_DEFAULT_SNDBUF); + if (!sndbuf) { + sndbuf = INT_MAX; + } + + if (ioctl(s->fd, TUNSETSNDBUF, &sndbuf) == -1 && qemu_opt_get(opts, "sndbuf")) { + qemu_error("TUNSETSNDBUF ioctl failed: %s\n", strerror(errno)); + return -1; + } + return 0; +} + +int tap_has_ufo(VLANClientState *vc) +{ + TAPState *s = vc->opaque; + + assert(vc->type == NET_CLIENT_TYPE_TAP); + + return s->has_ufo; +} + +int tap_has_vnet_hdr(VLANClientState *vc) +{ + TAPState *s = vc->opaque; + + assert(vc->type == NET_CLIENT_TYPE_TAP); + + return s->has_vnet_hdr; +} + +void tap_using_vnet_hdr(VLANClientState *vc, int using_vnet_hdr) +{ + TAPState *s = vc->opaque; + + using_vnet_hdr = using_vnet_hdr != 0; + + assert(vc->type == NET_CLIENT_TYPE_TAP); + assert(s->has_vnet_hdr == using_vnet_hdr); + + s->using_vnet_hdr = using_vnet_hdr; +} + +static int tap_probe_vnet_hdr(int fd) +{ + struct ifreq ifr; + + if (ioctl(fd, TUNGETIFF, &ifr) != 0) { + qemu_error("TUNGETIFF ioctl() failed: %s\n", strerror(errno)); + return 0; + } + + return ifr.ifr_flags & IFF_VNET_HDR; +} + +void tap_set_offload(VLANClientState *vc, int csum, int tso4, + int tso6, int ecn, int ufo) +{ + TAPState *s = vc->opaque; + unsigned int offload = 0; + + if (csum) { + offload |= TUN_F_CSUM; + if (tso4) + offload |= TUN_F_TSO4; + if (tso6) + offload |= TUN_F_TSO6; + if ((tso4 || tso6) && ecn) + offload |= TUN_F_TSO_ECN; + if (ufo) + offload |= TUN_F_UFO; + } + + if (ioctl(s->fd, TUNSETOFFLOAD, offload) != 0) { + offload &= ~TUN_F_UFO; + if (ioctl(s->fd, TUNSETOFFLOAD, offload) != 0) { + fprintf(stderr, "TUNSETOFFLOAD ioctl() failed: %s\n", + strerror(errno)); + } + } +} + +static void tap_cleanup(VLANClientState *vc) +{ + TAPState *s = vc->opaque; + + qemu_purge_queued_packets(vc); + + if (s->down_script[0]) + launch_script(s->down_script, s->down_script_arg, s->fd); + + tap_read_poll(s, 0); + tap_write_poll(s, 0); + close(s->fd); + qemu_free(s); +} + +/* fd support */ + +static TAPState *net_tap_fd_init(VLANState *vlan, + const char *model, + const char *name, + int fd, + int vnet_hdr) +{ + TAPState *s; + unsigned int offload; + + s = qemu_mallocz(sizeof(TAPState)); + s->fd = fd; + s->has_vnet_hdr = vnet_hdr != 0; + s->using_vnet_hdr = 0; + s->vc = qemu_new_vlan_client(NET_CLIENT_TYPE_TAP, + vlan, NULL, model, name, NULL, + tap_receive, tap_receive_raw, + tap_receive_iov, tap_cleanup, s); + s->has_ufo = 0; + /* Check if tap supports UFO */ + offload = TUN_F_CSUM | TUN_F_UFO; + if (ioctl(s->fd, TUNSETOFFLOAD, offload) == 0) + s->has_ufo = 1; + tap_set_offload(s->vc, 0, 0, 0, 0, 0); + tap_read_poll(s, 1); + return s; +} + +#if defined (CONFIG_BSD) || defined (__FreeBSD_kernel__) +static int tap_open(char *ifname, int ifname_size, + int *vnet_hdr, int vnet_hdr_required) +{ + int fd; + char *dev; + struct stat s; + + TFR(fd = open("/dev/tap", O_RDWR)); + if (fd < 0) { + fprintf(stderr, "warning: could not open /dev/tap: no virtual network emulation\n"); + return -1; + } + + fstat(fd, &s); + dev = devname(s.st_rdev, S_IFCHR); + pstrcpy(ifname, ifname_size, dev); + + fcntl(fd, F_SETFL, O_NONBLOCK); + return fd; +} +#elif defined(__sun__) +#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; +} + +static 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); + fcntl(fd, F_SETFL, O_NONBLOCK); + return fd; +} +#elif defined (_AIX) +static int tap_open(char *ifname, int ifname_size, + int *vnet_hdr, int vnet_hdr_required) +{ + fprintf (stderr, "no tap on AIX\n"); + return -1; +} +#else +static int tap_open(char *ifname, int ifname_size, + int *vnet_hdr, int vnet_hdr_required) +{ + struct ifreq ifr; + int fd, ret; + + TFR(fd = open("/dev/net/tun", O_RDWR)); + if (fd < 0) { + fprintf(stderr, "warning: could not open /dev/net/tun: no virtual network emulation\n"); + return -1; + } + memset(&ifr, 0, sizeof(ifr)); + ifr.ifr_flags = IFF_TAP | IFF_NO_PI; + + if (*vnet_hdr) { + unsigned int features; + + if (ioctl(fd, TUNGETFEATURES, &features) == 0 && + features & IFF_VNET_HDR) { + *vnet_hdr = 1; + ifr.ifr_flags |= IFF_VNET_HDR; + } + + if (vnet_hdr_required && !*vnet_hdr) { + qemu_error("vnet_hdr=1 requested, but no kernel " + "support for IFF_VNET_HDR available"); + close(fd); + return -1; + } + } + + if (ifname[0] != '\0') + pstrcpy(ifr.ifr_name, IFNAMSIZ, ifname); + else + pstrcpy(ifr.ifr_name, IFNAMSIZ, "tap%d"); + ret = ioctl(fd, TUNSETIFF, (void *) &ifr); + if (ret != 0) { + fprintf(stderr, "warning: could not configure /dev/net/tun: no virtual network emulation\n"); + close(fd); + return -1; + } + pstrcpy(ifname, ifname_size, ifr.ifr_name); + fcntl(fd, F_SETFL, O_NONBLOCK); + return fd; +} +#endif + +static int launch_script(const char *setup_script, const char *ifname, int fd) +{ + sigset_t oldmask, mask; + int pid, status; + char *args[3]; + char **parg; + + sigemptyset(&mask); + sigaddset(&mask, SIGCHLD); + sigprocmask(SIG_BLOCK, &mask, &oldmask); + + /* try to launch network script */ + pid = fork(); + if (pid == 0) { + int open_max = sysconf(_SC_OPEN_MAX), i; + + for (i = 0; i < open_max; i++) { + if (i != STDIN_FILENO && + i != STDOUT_FILENO && + i != STDERR_FILENO && + i != fd) { + close(i); + } + } + parg = args; + *parg++ = (char *)setup_script; + *parg++ = (char *)ifname; + *parg++ = NULL; + execv(setup_script, args); + _exit(1); + } else if (pid > 0) { + while (waitpid(pid, &status, 0) != pid) { + /* loop */ + } + sigprocmask(SIG_SETMASK, &oldmask, NULL); + + if (WIFEXITED(status) && WEXITSTATUS(status) == 0) { + return 0; + } + } + fprintf(stderr, "%s: could not launch network script\n", setup_script); + return -1; +} + +static int net_tap_init(QemuOpts *opts, int *vnet_hdr) +{ + int fd, vnet_hdr_required; + char ifname[128] = {0,}; + const char *setup_script; + + if (qemu_opt_get(opts, "ifname")) { + pstrcpy(ifname, sizeof(ifname), qemu_opt_get(opts, "ifname")); + } + + *vnet_hdr = qemu_opt_get_bool(opts, "vnet_hdr", 1); + if (qemu_opt_get(opts, "vnet_hdr")) { + vnet_hdr_required = *vnet_hdr; + } else { + vnet_hdr_required = 0; + } + + TFR(fd = tap_open(ifname, sizeof(ifname), vnet_hdr, vnet_hdr_required)); + if (fd < 0) { + return -1; + } + + setup_script = qemu_opt_get(opts, "script"); + if (setup_script && + setup_script[0] != '\0' && + strcmp(setup_script, "no") != 0 && + launch_script(setup_script, ifname, fd)) { + close(fd); + return -1; + } + + qemu_opt_set(opts, "ifname", ifname); + + return fd; +} + +int net_init_tap(QemuOpts *opts, Monitor *mon, const char *name, VLANState *vlan) +{ + TAPState *s; + int fd, vnet_hdr; + + if (qemu_opt_get(opts, "fd")) { + if (qemu_opt_get(opts, "ifname") || + qemu_opt_get(opts, "script") || + qemu_opt_get(opts, "downscript") || + qemu_opt_get(opts, "vnet_hdr")) { + qemu_error("ifname=, script=, downscript= and vnet_hdr= is invalid with fd=\n"); + return -1; + } + + fd = net_handle_fd_param(mon, qemu_opt_get(opts, "fd")); + if (fd == -1) { + return -1; + } + + fcntl(fd, F_SETFL, O_NONBLOCK); + + vnet_hdr = tap_probe_vnet_hdr(fd); + } else { + if (!qemu_opt_get(opts, "script")) { + qemu_opt_set(opts, "script", DEFAULT_NETWORK_SCRIPT); + } + + if (!qemu_opt_get(opts, "downscript")) { + qemu_opt_set(opts, "downscript", DEFAULT_NETWORK_DOWN_SCRIPT); + } + + fd = net_tap_init(opts, &vnet_hdr); + } + + s = net_tap_fd_init(vlan, "tap", name, fd, vnet_hdr); + if (!s) { + close(fd); + return -1; + } + + if (tap_set_sndbuf(s, opts) < 0) { + return -1; + } + + if (qemu_opt_get(opts, "fd")) { + snprintf(s->vc->info_str, sizeof(s->vc->info_str), "fd=%d", fd); + } else { + const char *ifname, *script, *downscript; + + ifname = qemu_opt_get(opts, "ifname"); + script = qemu_opt_get(opts, "script"); + downscript = qemu_opt_get(opts, "downscript"); + + snprintf(s->vc->info_str, sizeof(s->vc->info_str), + "ifname=%s,script=%s,downscript=%s", + ifname, script, downscript); + + if (strcmp(downscript, "no") != 0) { + snprintf(s->down_script, sizeof(s->down_script), "%s", downscript); + snprintf(s->down_script_arg, sizeof(s->down_script_arg), "%s", ifname); + } + } + + if (vlan) { + vlan->nb_host_devs++; + } + + return 0; +} + +#endif /* !defined(_AIX) */ |