RepoMirrors
/
netlink
mirror of https://github.com/vishvananda/netlink
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity
netlink/bpf_linux.go

61 lines
1.3 KiB
Go
Raw Normal View History

Add BPF TcAction support to U32 filter Current U32 filter only supports redirect action, but the U32 can support a lot more. Refactor a bit the action generating/parsing logic to be more generic and add BPF action support. When creating a U32 filter, one can supply an array of Actions, which will be executed by the U32 filter in order: * The new MirredAction implements the same functionality as RedirIndex field in the U32 filter, with that static field kept in the struct for backwards compatibility. * A new BpfAction type is added which allows a program with an open bpf file descriptor (implementation is out of scope of this patch) to be added as well. Add a test for the above use case which includes one of each type of action.
2016-02-29 07:12:34 +00:00
package netlink
/*
#include <asm/types.h>
#include <asm/unistd.h>
Skip test if bpf syscall is unavailable
2016-02-29 07:52:26 +00:00
#include <errno.h>
Add BPF TcAction support to U32 filter Current U32 filter only supports redirect action, but the U32 can support a lot more. Refactor a bit the action generating/parsing logic to be more generic and add BPF action support. When creating a U32 filter, one can supply an array of Actions, which will be executed by the U32 filter in order: * The new MirredAction implements the same functionality as RedirIndex field in the U32 filter, with that static field kept in the struct for backwards compatibility. * A new BpfAction type is added which allows a program with an open bpf file descriptor (implementation is out of scope of this patch) to be added as well. Add a test for the above use case which includes one of each type of action.
2016-02-29 07:12:34 +00:00
#include <stdio.h>
Fix 32bit warnings in bpf_linux.go The underlying struct type is still u64 regardless of architecture, but the local cast should be to uintptr_t to squelch the warning.
2016-03-18 18:13:40 +00:00
#include <stdint.h>
Add BPF TcAction support to U32 filter Current U32 filter only supports redirect action, but the U32 can support a lot more. Refactor a bit the action generating/parsing logic to be more generic and add BPF action support. When creating a U32 filter, one can supply an array of Actions, which will be executed by the U32 filter in order: * The new MirredAction implements the same functionality as RedirIndex field in the U32 filter, with that static field kept in the struct for backwards compatibility. * A new BpfAction type is added which allows a program with an open bpf file descriptor (implementation is out of scope of this patch) to be added as well. Add a test for the above use case which includes one of each type of action.
2016-02-29 07:12:34 +00:00
#include <unistd.h>
static int load_simple_bpf(int prog_type) {
Skip test if bpf syscall is unavailable
2016-02-29 07:52:26 +00:00
#ifdef __NR_bpf
Add BPF TcAction support to U32 filter Current U32 filter only supports redirect action, but the U32 can support a lot more. Refactor a bit the action generating/parsing logic to be more generic and add BPF action support. When creating a U32 filter, one can supply an array of Actions, which will be executed by the U32 filter in order: * The new MirredAction implements the same functionality as RedirIndex field in the U32 filter, with that static field kept in the struct for backwards compatibility. * A new BpfAction type is added which allows a program with an open bpf file descriptor (implementation is out of scope of this patch) to be added as well. Add a test for the above use case which includes one of each type of action.
2016-02-29 07:12:34 +00:00
// { return 1; }
__u64 __attribute__((aligned(8))) insns[] = {
0x00000001000000b7ull,
0x0000000000000095ull,
};
__u8 __attribute__((aligned(8))) license[] = "ASL2";
// Copied from a header file since libc is notoriously slow to update.
// The call will succeed or fail and that will be our indication on
// whether or not it is supported.
struct {
__u32 prog_type;
__u32 insn_cnt;
__u64 insns;
__u64 license;
__u32 log_level;
__u32 log_size;
__u64 log_buf;
__u32 kern_version;
} __attribute__((aligned(8))) attr = {
.prog_type = prog_type,
.insn_cnt = 2,
Fix 32bit warnings in bpf_linux.go The underlying struct type is still u64 regardless of architecture, but the local cast should be to uintptr_t to squelch the warning.
2016-03-18 18:13:40 +00:00
.insns = (uintptr_t)&insns,
.license = (uintptr_t)&license,
Add BPF TcAction support to U32 filter Current U32 filter only supports redirect action, but the U32 can support a lot more. Refactor a bit the action generating/parsing logic to be more generic and add BPF action support. When creating a U32 filter, one can supply an array of Actions, which will be executed by the U32 filter in order: * The new MirredAction implements the same functionality as RedirIndex field in the U32 filter, with that static field kept in the struct for backwards compatibility. * A new BpfAction type is added which allows a program with an open bpf file descriptor (implementation is out of scope of this patch) to be added as well. Add a test for the above use case which includes one of each type of action.
2016-02-29 07:12:34 +00:00
};
return syscall(__NR_bpf, 5, &attr, sizeof(attr));
Skip test if bpf syscall is unavailable
2016-02-29 07:52:26 +00:00
#else
errno = EINVAL;
return -1;
#endif
Add BPF TcAction support to U32 filter Current U32 filter only supports redirect action, but the U32 can support a lot more. Refactor a bit the action generating/parsing logic to be more generic and add BPF action support. When creating a U32 filter, one can supply an array of Actions, which will be executed by the U32 filter in order: * The new MirredAction implements the same functionality as RedirIndex field in the U32 filter, with that static field kept in the struct for backwards compatibility. * A new BpfAction type is added which allows a program with an open bpf file descriptor (implementation is out of scope of this patch) to be added as well. Add a test for the above use case which includes one of each type of action.
2016-02-29 07:12:34 +00:00
}
*/
import "C"
type BpfProgType C.int
const (
BPF_PROG_TYPE_UNSPEC BpfProgType = iota
BPF_PROG_TYPE_SOCKET_FILTER
BPF_PROG_TYPE_KPROBE
BPF_PROG_TYPE_SCHED_CLS
BPF_PROG_TYPE_SCHED_ACT
)
// loadSimpleBpf loads a trivial bpf program for testing purposes
func loadSimpleBpf(progType BpfProgType) (int, error) {
fd, err := C.load_simple_bpf(C.int(progType))
return int(fd), err
}