955695cdc5
QEMU is a FAST! processor emulator using dynamic translation to achieve good emulation speed. QEMU has two operating modes: * Full system emulation. In this mode, QEMU emulates a full system (for example a PC), including a processor and various peripherials. It can be used to launch different Operating Systems without rebooting the PC or to debug system code. * User mode emulation (Linux host only). In this mode, QEMU can launch Linux processes compiled for one CPU on another CPU. It can be used to launch the Wine Windows API emulator or to ease cross-compilation and cross-debugging. As QEMU requires no host kernel patches to run, it is very safe and easy to use. See also the preconfigured system images on http://oszoo.org/ Many live cd isos also work. WWW: http://wiki.qemu.org/Main_Page In preparation of updating emulators/qemu to 5.0.X STABLE branch moving 4.2.X to a new port.
252 lines
6.7 KiB
C
252 lines
6.7 KiB
C
--- net/net.c.orig 2020-06-25 18:12:17 UTC
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+++ net/net.c
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@@ -55,6 +55,11 @@
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#include "net/filter.h"
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#include "qapi/string-output-visitor.h"
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+#include <sys/ioctl.h>
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+#ifdef __FreeBSD__
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+#include <net/if.h>
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+#endif
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+
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/* Net bridge is currently not supported for W32. */
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#if !defined(_WIN32)
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# define CONFIG_NET_BRIDGE
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@@ -935,7 +940,226 @@ static int net_init_nic(const Netdev *netdev, const ch
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return idx;
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}
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+#if defined(CONFIG_PCAP)
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+#if defined(CONFIG_BPF)
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+#define PCAP_DONT_INCLUDE_PCAP_BPF_H
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+#include <net/bpf.h>
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+#endif
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+#include <pcap.h>
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+struct PCAPState {
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+ NetClientState nc;
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+ pcap_t *handle;
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+ int max_eth_frame_size;
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+};
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+
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+static ssize_t pcap_receive(NetClientState *nc, const uint8_t *buf, size_t size)
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+{
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+ struct PCAPState *s = DO_UPCAST(struct PCAPState, nc, nc);
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+
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+ return pcap_inject(s->handle, (u_char*)buf, size);
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+}
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+
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+static void pcap_callback(u_char *user, struct pcap_pkthdr *phdr, u_char *pdata
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+ )
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+{
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+ NetClientState *nc = (NetClientState *)user;
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+
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+ int len = phdr->len;
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+#ifdef __FreeBSD__
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+ struct PCAPState *s = DO_UPCAST(struct PCAPState, nc, nc);
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+ int max_eth_frame_size = s->max_eth_frame_size;
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+
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+ if (len > max_eth_frame_size) {
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+ fprintf(stderr,
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+ "pcap_send: packet size > %d (%d), truncating\n",
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+ max_eth_frame_size, len);
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+ len = max_eth_frame_size;
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+ }
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+#endif
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+ qemu_send_packet(nc, pdata, len);
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+}
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+
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+static void pcap_send(void *opaque)
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+{
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+ struct PCAPState *s = (struct PCAPState *)opaque;
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+
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+ for (;;) {
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+ if (pcap_dispatch(s->handle, 0, (pcap_handler)&pcap_callback, (u_char *)&s->nc) >= 0)
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+ break;
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+ }
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+}
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+
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+static void pcap_cleanup(NetClientState *nc)
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+{
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+ struct PCAPState *s = DO_UPCAST(struct PCAPState, nc, nc);
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+
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+ qemu_purge_queued_packets(nc);
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+ pcap_close(s->handle);
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+}
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+
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+static NetClientInfo net_pcap_info = {
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+ .type = NET_CLIENT_DRIVER_PCAP,
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+ .size = sizeof(struct PCAPState),
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+ .receive = pcap_receive,
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+// .receive_raw = pcap_receive_raw,
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+// .receive_iov = pcap_receive_iov,
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+// .poll = pcap_poll,
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+ .cleanup = pcap_cleanup,
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+};
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+/*
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+ * ... -net pcap,ifname="..."
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+ */
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+
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+int net_init_pcap(const Netdev *netdev,
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+ const char *name, NetClientState *peer, Error **errp)
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+{
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+ const NetdevPcapOptions *pcap_opts;
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+ NetClientState *nc;
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+ struct PCAPState *s;
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+ const char *ifname;
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+ char errbuf[PCAP_ERRBUF_SIZE];
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+ pcap_if_t *alldevsp;
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+#if defined(_WIN32)
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+ HANDLE h;
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+#endif
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+ int i;
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+
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+ assert(netdev->type == NET_CLIENT_DRIVER_PCAP);
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+ pcap_opts = &netdev->u.pcap;
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+ if (!pcap_opts->has_ifname)
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+ return -1;
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+
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+ ifname = pcap_opts->ifname;
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+
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+ /* create the object */
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+ nc = qemu_new_net_client(&net_pcap_info, peer, "pcap", ifname);
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+ s = DO_UPCAST(struct PCAPState, nc, nc);
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+
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+ if (ifname == NULL && (ifname = pcap_findalldevs(&alldevsp, errbuf)) == NULL) {
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+ fprintf(stderr, "qemu: pcap_create: %s\n", errbuf);
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+ goto fail;
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+ }
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+
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+#ifdef __FreeBSD__
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+ /*
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+ * We want to avoid passing oversize packets to the guest, which
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+ * at least on FreeBSD can happen if the host interface uses tso
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+ * (seen with an em(4) in this case) - so find out the host
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+ * interface's mtu and assume the guest is configured the same.
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+ */
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+ s->max_eth_frame_size = 1514;
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+ i = socket(AF_INET, SOCK_DGRAM, 0);
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+ if (i >= 0) {
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+ struct ifreq ifr;
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+
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+ (void) memset(&ifr, 0, sizeof(ifr));
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+ strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
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+ if (ioctl(i, SIOCGIFMTU, &ifr) != -1)
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+ s->max_eth_frame_size = ifr.ifr_mtu + 14;
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+ close(i);
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+ }
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+#endif
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+
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+#if defined(CONFIG_PCAP_CREATE) || defined(_WIN32)
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+ /*
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+ * Create pcap handle for the device, set promiscuous mode and activate.
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+ */
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+ s->handle = (void *)pcap_create(ifname, errbuf);
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+ if (!s->handle) {
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+ fprintf(stderr, "qemu: pcap_create: %s\n", errbuf);
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+ goto fail;
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+ }
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+ if (pcap_set_promisc(s->handle, 1) != 0) {
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+ pcap_perror(s->handle, (char *)"qemu: pcap_set_promisc:");
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+ goto fail;
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+ }
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+ if (pcap_activate(s->handle) != 0) {
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+ pcap_perror(s->handle, (char *)"qemu: pcap_activate:");
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+ goto fail;
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+ }
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+#else
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+ /* Attempt to connect device. */
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+ s->handle = (void *)pcap_open_live(ifname, 65535, 1, 0, errbuf);
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+ if (!s->handle) {
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+ fprintf(stderr, "qemu: pcap_open_live: %s\n", errbuf);
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+ goto fail;
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+ }
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+#endif
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+
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+ /* Set non-blocking mode. */
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+ if (pcap_setnonblock(s->handle, 1, errbuf) < 0) {
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+ fprintf(stderr, "qemu: pcap_setnonblock: %s\n", errbuf);
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+ goto fail;
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+ }
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+
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+#if defined(_WIN32)
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+ /*
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+ * Tell the kernel that the packet has to be seen immediately.
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+ */
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+ if (pcap_setmintocopy(s->handle, 0) < 0) {
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+ fprintf(stderr, "qemu: pcap failed to set immediate mode\n");
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+ goto fail;
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+ }
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+#else /* !_WIN32 */
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+#if defined(CONFIG_BPF)
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+#if defined(BIOCIMMEDIATE)
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+ /*
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+ * Tell the kernel that the packet has to be seen immediately.
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+ */
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+ {
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+ unsigned int one = 1;
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+ if (ioctl(pcap_fileno(s->handle), BIOCIMMEDIATE, &one) < 0) {
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+ fprintf(stderr, "qemu: pcap failed to set immediate mode\n");
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+ goto fail;
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+ }
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+ }
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+#endif /* BIOCIMMEDIATE */
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+#if defined(BIOCFEEDBACK)
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+ /*
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+ * Tell the kernel that the sent packet has to be fed back.
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+ * This is necessary to connect host and guest.
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+ */
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+ {
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+ unsigned int one = 1;
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+ if (ioctl(pcap_fileno(s->handle), BIOCFEEDBACK, &one) < 0) {
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+ fprintf(stderr, "qemu: pcap failed to set feedback mode\n");
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+ goto fail;
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+ }
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+ }
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+#endif /* BIOCFEEDBACK */
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+#endif /* CONFIG_BPF */
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+#endif /* _WIN32 */
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+
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+ snprintf(s->nc.info_str, sizeof(s->nc.info_str), "pcap redirector");
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+
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+#if defined(_WIN32)
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+ if ((h = pcap_getevent(s->handle)) == NULL) {
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+ fprintf(stderr, "qemu: pcap_getevent failed\n");
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+ goto fail;
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+ }
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+ qemu_add_wait_object(h, pcap_send, s);
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+#else /* !_WIN32 */
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+ if ((i = pcap_get_selectable_fd(s->handle)) < 0) {
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+ fprintf(stderr, "qemu: pcap_get_selectable_fd failed\n");
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+ goto fail;
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+ }
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+ qemu_set_fd_handler(i, pcap_send, NULL, s);
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+#endif /* _WIN32 */
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+
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+ return 0;
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+
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+fail:
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+ if (s) {
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+ if (s->handle)
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+ pcap_close(s->handle);
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+ }
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+
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+ return -1;
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+}
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+
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+#endif
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+
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static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
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const Netdev *netdev,
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const char *name,
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@@ -961,6 +1185,9 @@ static int (* const net_client_init_fun[NET_CLIENT_DRI
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#endif
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#ifdef CONFIG_L2TPV3
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[NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3,
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+#endif
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+#ifdef CONFIG_PCAP
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+ [NET_CLIENT_DRIVER_PCAP] = net_init_pcap,
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#endif
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};
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