File 0015-pcap-network-emulation.patch of Package qemu
From 99759e033ea960b86828657682f8382538c4ccb7 Mon Sep 17 00:00:00 2001
From: Ulrich Hecht <uli@suse.de>
Date: Tue, 14 Apr 2009 16:52:51 +0200
Subject: [PATCH 15/33] pcap network emulation
Implements network emulation using libpcap; useful for direct Ethernet access.
Signed-off-by: Ulrich Hecht <uli@suse.de>
---
Makefile.target | 3 ++
configure | 7 ++++
net.c | 108 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
qemu-options.hx | 4 ++
4 files changed, 122 insertions(+), 0 deletions(-)
diff --git a/Makefile.target b/Makefile.target
index f9cd42a..9c9304c 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -618,6 +618,9 @@ endif
ifdef CONFIG_SLIRP
CPPFLAGS+=-I$(SRC_PATH)/slirp
endif
+ifdef CONFIG_PCAP
+LIBS+=-lpcap
+endif
# specific flags are needed for non soft mmu emulator
ifdef CONFIG_STATIC
diff --git a/configure b/configure
index cac4198..4ce7bc1 100755
--- a/configure
+++ b/configure
@@ -169,6 +169,7 @@ mingw32="no"
EXESUF=""
slirp="yes"
vde="yes"
+pcap="yes"
fmod_lib=""
fmod_inc=""
oss_lib=""
@@ -432,6 +433,8 @@ for opt do
;;
--disable-vde) vde="no"
;;
+ --disable-pcap) pcap="no"
+ ;;
--disable-kqemu) kqemu="no"
;;
--disable-xen) xen="no"
@@ -1598,6 +1601,10 @@ if test "$vde" = "yes" ; then
echo "#define CONFIG_VDE 1" >> $config_host_h
echo "VDE_LIBS=-lvdeplug" >> $config_host_mak
fi
+if test "$pcap" = "yes" ; then
+ echo "CONFIG_PCAP=yes" >> $config_host_mak
+ echo "#define CONFIG_PCAP 1" >> $config_host_h
+fi
for card in $audio_card_list; do
def=CONFIG_`echo $card | tr '[:lower:]' '[:upper:]'`
echo "$def=y" >> $config_host_mak
diff --git a/net.c b/net.c
index 3d3829d..595f7bc 100644
--- a/net.c
+++ b/net.c
@@ -1264,6 +1264,105 @@ void do_info_usernet(Monitor *mon)
#endif /* CONFIG_SLIRP */
+#if defined(CONFIG_PCAP)
+#include <pcap.h>
+typedef struct PCAPState {
+ VLANClientState *vc;
+ pcap_t *handle;
+} PCAPState;
+
+static ssize_t pcap_receive(VLANClientState *vc, const uint8_t *buf, size_t size)
+{
+ PCAPState *s = (PCAPState *)(vc->opaque);
+
+ pcap_sendpacket(s->handle, (u_char*)buf, size);
+ return size;
+}
+
+static void pcap_callback(u_char *user, struct pcap_pkthdr *phdr, u_char *pdata)
+{
+ VLANClientState *vc = (VLANClientState *)user;
+
+ qemu_send_packet(vc, pdata, phdr->len);
+}
+
+static void pcap_send(void *opaque)
+{
+ PCAPState *s = (PCAPState *)opaque;
+
+ pcap_dispatch(s->handle, 1, (pcap_handler)&pcap_callback, (u_char *)s->vc);
+}
+
+static int net_pcap_init(VLANState *vlan, const char *model, const char *name, char *ifname)
+{
+ PCAPState *s;
+ char errbuf[PCAP_ERRBUF_SIZE];
+ int fd;
+
+ s = qemu_mallocz(sizeof(PCAPState));
+ if (!s)
+ return -1;
+
+ if (ifname == NULL && (ifname = pcap_lookupdev(errbuf)) == NULL) {
+ fprintf(stderr, "qemu: pcap_lookupdev: %s\n", errbuf);
+ goto fail;
+ }
+
+ /* Attempt to connect device. */
+ s->handle = (void*)pcap_open_live(ifname, 65535, 1, 0, errbuf);
+ if (!s->handle) {
+ fprintf(stderr, "qemu: pcap_open_live: %s\n", errbuf);
+ goto fail;
+ }
+
+ /* Check non-blocking mode. */
+ if (pcap_setnonblock(s->handle, 1, errbuf) < 0) {
+ fprintf(stderr, "qemu: pcap_setnonblock: %s\n", errbuf);
+ goto fail;
+ }
+
+#if defined(BIOCSHDRCMPLT)
+ /*
+ * Tell the kernel that the header is fully-formed when it gets it.
+ * This is required in order to fake the src address.
+ */
+ {
+ unsigned int one = 1;
+ ioctl(pcap_fileno(s->handle), BIOCSHDRCMPLT, &one);
+ }
+#endif /* BIOCSHDRCMPLT */
+
+#if defined(BIOCIMMEDIATE)
+ /*
+ * Tell the kernel that the packet has to be processed immediately.
+ */
+ {
+ unsigned int one = 1;
+ ioctl(pcap_fileno(s->handle), BIOCIMMEDIATE, &one);
+ }
+#endif /* BIOCIMMEDIATE */
+
+ s->vc = qemu_new_vlan_client(vlan, model, name, NULL, pcap_receive, NULL, NULL, s);
+ snprintf(s->vc->info_str, sizeof(s->vc->info_str), "pcap redirector");
+ if ((fd = pcap_get_selectable_fd(s->handle)) < 0) {
+ fprintf(stderr, "qemu: pcap_get_selectable_fd failed\n");
+ goto fail;
+ }
+ qemu_set_fd_handler(fd, pcap_send, NULL, s);
+
+ return 0;
+
+fail:
+ if (s) {
+ if (s->handle)
+ pcap_close(s->handle);
+ qemu_free(s);
+ }
+
+ return -1;
+}
+#endif /* CONFIG_PCAP */
+
#if !defined(_WIN32)
typedef struct TAPState {
@@ -2631,6 +2730,15 @@ int net_client_init(Monitor *mon, const char *device, const char *p)
ret = 0;
} else
#endif
+#ifdef CONFIG_PCAP
+ if (!strcmp(device, "pcap")) {
+ char ifname[64];
+ if (get_param_value(ifname, sizeof(ifname), "ifname", p) <= 0)
+ ret = net_pcap_init(vlan, device, name, NULL);
+ else
+ ret = net_pcap_init(vlan, device, name, ifname);
+ } else
+#endif
#ifdef _WIN32
if (!strcmp(device, "tap")) {
static const char * const tap_params[] = {
diff --git a/qemu-options.hx b/qemu-options.hx
index a58287c..4d46d6c 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -801,6 +801,10 @@ DEF("net", HAS_ARG, QEMU_OPTION_net,
" default of 'sndbuf=1048576' can be disabled using 'sndbuf=0'\n"
#endif
#endif
+#ifdef CONFIG_PCAP
+ "-net pcap[,vlan=n][,ifname=name]\n"
+ " connect the host network interface using PCAP to VLAN 'n'\n"
+#endif
"-net socket[,vlan=n][,name=str][,fd=h][,listen=[host]:port][,connect=host:port]\n"
" connect the vlan 'n' to another VLAN using a socket connection\n"
"-net socket[,vlan=n][,name=str][,fd=h][,mcast=maddr:port]\n"
--
1.6.2.1
