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Subject[patch 6/9] uml: reintroduce pcap support
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Date

The pcap support was not working because of some linking problems (expressing
the construct in Kbuild was a bit difficult) and because there was no user
request. Now that this has come back, here's the support.

This has been tested and works on both 32 and 64-bit hosts, even when
"cross-"building 32-bit binaries.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
---
linux-2.6.git-broken-paolo/arch/um/Kconfig_net | 2 +-
linux-2.6.git-broken-paolo/arch/um/Makefile | 14 +++++++++-----
linux-2.6.git-broken-paolo/arch/um/drivers/Makefile | 17 ++++++++++++++---
3 files changed, 24 insertions(+), 9 deletions(-)
diff -puN arch/um/drivers/Makefile~uml-reallow-pcap arch/um/drivers/Makefile
--- linux-2.6.git-broken/arch/um/drivers/Makefile~uml-reallow-pcap 2005-07-13 19:43:05.000000000 +0200
+++ linux-2.6.git-broken-paolo/arch/um/drivers/Makefile 2005-07-13 19:43:30.000000000 +0200
@@ -10,7 +10,6 @@ slip-objs := slip_kern.o slip_user.o
slirp-objs := slirp_kern.o slirp_user.o
daemon-objs := daemon_kern.o daemon_user.o
mcast-objs := mcast_kern.o mcast_user.o
-#pcap-objs := pcap_kern.o pcap_user.o $(PCAP)
net-objs := net_kern.o net_user.o
mconsole-objs := mconsole_kern.o mconsole_user.o
hostaudio-objs := hostaudio_kern.o
@@ -18,6 +17,17 @@ ubd-objs := ubd_kern.o ubd_user.o
port-objs := port_kern.o port_user.o
harddog-objs := harddog_kern.o harddog_user.o

+LDFLAGS_pcap.o := -r $(shell $(CC) $(CFLAGS) -print-file-name=libpcap.a)
+
+$(obj)/pcap.o: $(obj)/pcap_kern.o $(obj)/pcap_user.o
+ $(LD) -r -dp -o $@ $^ $(LDFLAGS) $(LDFLAGS_pcap.o)
+#XXX: The call below does not work because the flags are added before the
+# object name, so nothing from the library gets linked.
+#$(call if_changed,ld)
+
+# When the above is fixed, don't forget to add this too!
+#targets := $(obj)/pcap.o
+
obj-y := stdio_console.o fd.o chan_kern.o chan_user.o line.o
obj-$(CONFIG_SSL) += ssl.o
obj-$(CONFIG_STDERR_CONSOLE) += stderr_console.o
@@ -26,7 +36,7 @@ obj-$(CONFIG_UML_NET_SLIP) += slip.o sli
obj-$(CONFIG_UML_NET_SLIRP) += slirp.o slip_common.o
obj-$(CONFIG_UML_NET_DAEMON) += daemon.o
obj-$(CONFIG_UML_NET_MCAST) += mcast.o
-#obj-$(CONFIG_UML_NET_PCAP) += pcap.o $(PCAP)
+obj-$(CONFIG_UML_NET_PCAP) += pcap.o
obj-$(CONFIG_UML_NET) += net.o
obj-$(CONFIG_MCONSOLE) += mconsole.o
obj-$(CONFIG_MMAPPER) += mmapper_kern.o
@@ -41,6 +51,7 @@ obj-$(CONFIG_UML_WATCHDOG) += harddog.o
obj-$(CONFIG_BLK_DEV_COW_COMMON) += cow_user.o
obj-$(CONFIG_UML_RANDOM) += random.o

-USER_OBJS := fd.o null.o pty.o tty.o xterm.o slip_common.o
+# pcap_user.o must be added explicitly.
+USER_OBJS := fd.o null.o pty.o tty.o xterm.o slip_common.o pcap_user.o

include arch/um/scripts/Makefile.rules
diff -puN arch/um/Kconfig_net~uml-reallow-pcap arch/um/Kconfig_net
--- linux-2.6.git-broken/arch/um/Kconfig_net~uml-reallow-pcap 2005-07-13 19:43:05.000000000 +0200
+++ linux-2.6.git-broken-paolo/arch/um/Kconfig_net 2005-07-13 19:43:05.000000000 +0200
@@ -135,7 +135,7 @@ config UML_NET_MCAST

config UML_NET_PCAP
bool "pcap transport"
- depends on UML_NET && BROKEN
+ depends on UML_NET && EXPERIMENTAL
help
The pcap transport makes a pcap packet stream on the host look
like an ethernet device inside UML. This is useful for making
diff -puN arch/um/Makefile~uml-reallow-pcap arch/um/Makefile
--- linux-2.6.git-broken/arch/um/Makefile~uml-reallow-pcap 2005-07-13 19:43:05.000000000 +0200
+++ linux-2.6.git-broken-paolo/arch/um/Makefile 2005-07-13 19:43:05.000000000 +0200
@@ -56,17 +56,21 @@ include $(srctree)/$(ARCH_DIR)/Makefile-
core-y += $(SUBARCH_CORE)
libs-y += $(SUBARCH_LIBS)

-# -Derrno=kernel_errno - This turns all kernel references to errno into
-# kernel_errno to separate them from the libc errno. This allows -fno-common
-# in CFLAGS. Otherwise, it would cause ld to complain about the two different
-# errnos.
+# -Dvmap=kernel_vmap affects everything, and prevents anything from
+# referencing the libpcap.o symbol so named.

CFLAGS += $(CFLAGS-y) -D__arch_um__ -DSUBARCH=\"$(SUBARCH)\" \
- $(ARCH_INCLUDE) $(MODE_INCLUDE)
+ $(ARCH_INCLUDE) $(MODE_INCLUDE) -Dvmap=kernel_vmap

USER_CFLAGS := $(patsubst -I%,,$(CFLAGS))
USER_CFLAGS := $(patsubst -D__KERNEL__,,$(USER_CFLAGS)) $(ARCH_INCLUDE) \
$(MODE_INCLUDE) $(ARCH_USER_CFLAGS)
+
+# -Derrno=kernel_errno - This turns all kernel references to errno into
+# kernel_errno to separate them from the libc errno. This allows -fno-common
+# in CFLAGS. Otherwise, it would cause ld to complain about the two different
+# errnos.
+
CFLAGS += -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask
CFLAGS += $(call cc-option,-fno-unit-at-a-time,)

_
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