um: Loadable BPF "Firmware" for vector drivers

All vector drivers now allow a BPF program to be loaded and
associated with the RX socket in the host kernel.

1. The program can be loaded as an extra kernel command line
option to any of the vector drivers.

2. The program can also be loaded as "firmware", using the
ethtool flash option. It is possible to turn this facility
on or off using a command line option.

A simplistic wrapper for generating the BPF firmware for the raw
socket driver out of a tcpdump/libpcap filter expression can be
found at: https://github.com/kot-begemot-uk/uml_vector_utilities/

Signed-off-by: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

1 files changed, 6 insertions, 2 deletions

diff --git a/arch/um/drivers/vector_user.h b/arch/um/drivers/vector_user.h
index 649ec250268b..91f35b266aba 100644
--- a/arch/um/drivers/vector_user.h
+++ b/arch/um/drivers/vector_user.h
@@ -28,6 +28,8 @@
 #define TRANS_BESS "bess"
 #define TRANS_BESS_LEN strlen(TRANS_BESS)
 
+#define DEFAULT_BPF_LEN 6
+
 #ifndef IPPROTO_GRE
 #define IPPROTO_GRE 0x2F
 #endif
@@ -95,8 +97,10 @@ extern int uml_vector_recvmmsg(
 	unsigned int vlen,
 	unsigned int flags
 );
-extern void *uml_vector_default_bpf(int fd, void *mac);
-extern int uml_vector_attach_bpf(int fd, void *bpf, int bpf_len);
+extern void *uml_vector_default_bpf(void *mac);
+extern void *uml_vector_user_bpf(char *filename);
+extern int uml_vector_attach_bpf(int fd, void *bpf);
+extern int uml_vector_detach_bpf(int fd, void *bpf);
 extern bool uml_raw_enable_qdisc_bypass(int fd);
 extern bool uml_raw_enable_vnet_headers(int fd);
 extern bool uml_tap_enable_vnet_headers(int fd);