mirror of
https://gitlab.com/libvirt/libvirt.git
synced 2024-11-01 02:41:14 +00:00
95b9db4ee2
Currently, we are mixing: #if HAVE_BLAH with #if WITH_BLAH.
Things got way better with Pavel's work on meson, but apparently,
mixing these two lead to confusing and easy to miss bugs (see
31fb929eca for instance). While we were forced to use HAVE_
prefix with autotools, we are free to chose our own prefix with
meson and since WITH_ prefix appears to be more popular let's use
it everywhere.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
257 lines
6.2 KiB
C
257 lines
6.2 KiB
C
/*
|
|
* virbpf.h: methods for eBPF
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library. If not, see
|
|
* <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#if WITH_DECL_BPF_PROG_QUERY
|
|
|
|
# include <linux/bpf.h>
|
|
|
|
/* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */
|
|
|
|
# define VIR_BPF_ALU64_REG(op, dst, src) \
|
|
((struct bpf_insn) { \
|
|
.code = BPF_ALU64 | BPF_OP(op) | BPF_X, \
|
|
.dst_reg = dst, \
|
|
.src_reg = src, \
|
|
.off = 0, \
|
|
.imm = 0, \
|
|
})
|
|
|
|
/* ALU ops on immediates, bpf_add|sub|...: dst_reg += imm32 */
|
|
|
|
# define VIR_BPF_ALU64_IMM(op, dst, immval) \
|
|
((struct bpf_insn) { \
|
|
.code = BPF_ALU64 | BPF_OP(op) | BPF_K, \
|
|
.dst_reg = dst, \
|
|
.src_reg = 0, \
|
|
.off = 0, \
|
|
.imm = immval, \
|
|
})
|
|
|
|
/* mov of registers, dst_reg = src_reg */
|
|
|
|
# define VIR_BPF_MOV64_REG(dst, src) \
|
|
((struct bpf_insn) { \
|
|
.code = BPF_ALU64 | BPF_MOV | BPF_X, \
|
|
.dst_reg = dst, \
|
|
.src_reg = src, \
|
|
.off = 0, \
|
|
.imm = 0, \
|
|
})
|
|
|
|
/* mov of immediates, dst_reg = imm32 */
|
|
|
|
# define VIR_BPF_MOV64_IMM(dst, immval) \
|
|
((struct bpf_insn) { \
|
|
.code = BPF_ALU64 | BPF_MOV | BPF_K, \
|
|
.dst_reg = dst, \
|
|
.src_reg = 0, \
|
|
.off = 0, \
|
|
.imm = immval, \
|
|
})
|
|
|
|
/* helper to encode 16 byte instruction */
|
|
|
|
# define _VIR_BPF_LD_IMM64_RAW(dst, src, immval) \
|
|
((struct bpf_insn) { \
|
|
.code = BPF_LD | BPF_DW | BPF_IMM, \
|
|
.dst_reg = dst, \
|
|
.src_reg = src, \
|
|
.off = 0, \
|
|
.imm = (uint32_t)immval, \
|
|
}), \
|
|
((struct bpf_insn) { \
|
|
.code = 0, \
|
|
.dst_reg = 0, \
|
|
.src_reg = 0, \
|
|
.off = 0, \
|
|
.imm = ((uint64_t)immval) >> 32, \
|
|
})
|
|
|
|
/* encodes single 'load 64-bit immediate' insn, dst_reg = imm ll */
|
|
|
|
# define VIR_BPF_LD_IMM64(dst, imm) \
|
|
_VIR_BPF_LD_IMM64_RAW(dst, 0, imm)
|
|
|
|
/* pseudo VIR_BPF_LD_IMM64 insn used to refer to process-local map_fd */
|
|
|
|
# define VIR_BPF_LD_MAP_FD(dst, mapfd) \
|
|
_VIR_BPF_LD_IMM64_RAW(dst, 1, mapfd)
|
|
|
|
/* memory load, dst_reg = *(size *) (src_reg + off16) */
|
|
|
|
# define VIR_BPF_LDX_MEM(size, dst, src, offval) \
|
|
((struct bpf_insn) { \
|
|
.code = BPF_LDX | BPF_SIZE(size) | BPF_MEM, \
|
|
.dst_reg = dst, \
|
|
.src_reg = src, \
|
|
.off = offval, \
|
|
.imm = 0, \
|
|
})
|
|
|
|
/* memory store of registers, *(size *) (dst_reg + off16) = src_reg */
|
|
|
|
# define VIR_BPF_STX_MEM(size, dst, src, offval) \
|
|
((struct bpf_insn) { \
|
|
.code = BPF_STX | BPF_SIZE(size) | BPF_MEM, \
|
|
.dst_reg = dst, \
|
|
.src_reg = src, \
|
|
.off = offval, \
|
|
.imm = 0, \
|
|
})
|
|
|
|
/* memory store of immediates, *(size *) (dst_reg + off16) = imm32 */
|
|
|
|
# define VIR_BPF_ST_MEM(size, dst, immval, offval) \
|
|
((struct bpf_insn) { \
|
|
.code = BPF_ST | BPF_SIZE(size) | BPF_MEM, \
|
|
.dst_reg = dst, \
|
|
.src_reg = 0, \
|
|
.off = offval, \
|
|
.imm = immval, \
|
|
})
|
|
|
|
/* conditional jumps against registers, if (dst_reg 'op' src_reg) goto pc + off16 */
|
|
|
|
# define VIR_BPF_JMP_REG(op, dst, src, offval) \
|
|
((struct bpf_insn) { \
|
|
.code = BPF_JMP | BPF_OP(op) | BPF_X, \
|
|
.dst_reg = dst, \
|
|
.src_reg = src, \
|
|
.off = offval, \
|
|
.imm = 0, \
|
|
})
|
|
|
|
/* conditional jumps against immediates, if (dst_reg 'op' imm32) goto pc + off16 */
|
|
|
|
# define VIR_BPF_JMP_IMM(op, dst, immval, offval) \
|
|
((struct bpf_insn) { \
|
|
.code = BPF_JMP | BPF_OP(op) | BPF_K, \
|
|
.dst_reg = dst, \
|
|
.src_reg = 0, \
|
|
.off = offval, \
|
|
.imm = immval, \
|
|
})
|
|
|
|
/* call eBPF function, call imm32 */
|
|
|
|
# define VIR_BPF_CALL_INSN(func) \
|
|
((struct bpf_insn) { \
|
|
.code = BPF_JMP | BPF_CALL, \
|
|
.dst_reg = 0, \
|
|
.src_reg = 0, \
|
|
.off = 0, \
|
|
.imm = func, \
|
|
})
|
|
|
|
/* program exit */
|
|
|
|
# define VIR_BPF_EXIT_INSN() \
|
|
((struct bpf_insn) { \
|
|
.code = BPF_JMP | BPF_EXIT, \
|
|
.dst_reg = 0, \
|
|
.src_reg = 0, \
|
|
.off = 0, \
|
|
.imm = 0, \
|
|
})
|
|
|
|
#else /* WITH_DECL_BPF_PROG_QUERY */
|
|
|
|
struct bpf_prog_info;
|
|
struct bpf_map_info;
|
|
struct bpf_insn;
|
|
|
|
# define VIR_BPF_ALU64_REG(op, dst, src)
|
|
# define VIR_BPF_ALU64_IMM(op, dst, immval)
|
|
# define VIR_BPF_MOV64_REG(dst, src)
|
|
# define VIR_BPF_MOV64_IMM(dst, immval)
|
|
# define VIR_BPF_LD_IMM64(dst, imm)
|
|
# define VIR_BPF_LD_MAP_FD(dst, mapfd)
|
|
# define VIR_BPF_LDX_MEM(size, dst, src, offval)
|
|
# define VIR_BPF_STX_MEM(size, dst, src, offval)
|
|
# define VIR_BPF_ST_MEM(size, dst, immval, offval)
|
|
# define VIR_BPF_JMP_REG(op, dst, src, offval)
|
|
# define VIR_BPF_JMP_IMM(op, dst, immval, offval)
|
|
# define VIR_BPF_CALL_INSN(func)
|
|
# define VIR_BPF_EXIT_INSN()
|
|
|
|
#endif /* WITH_DECL_BPF_PROG_QUERY */
|
|
|
|
int
|
|
virBPFCreateMap(unsigned int mapType,
|
|
unsigned int keySize,
|
|
unsigned int valSize,
|
|
unsigned int maxEntries);
|
|
|
|
int
|
|
virBPFGetMapInfo(int mapfd,
|
|
struct bpf_map_info *info);
|
|
|
|
int
|
|
virBPFLoadProg(struct bpf_insn *insns,
|
|
int progType,
|
|
unsigned int insnCnt);
|
|
|
|
int
|
|
virBPFAttachProg(int progfd,
|
|
int targetfd,
|
|
int attachType);
|
|
|
|
int
|
|
virBPFDetachProg(int progfd,
|
|
int targetfd,
|
|
int attachType);
|
|
|
|
int
|
|
virBPFQueryProg(int targetfd,
|
|
unsigned int maxprogids,
|
|
int attachType,
|
|
unsigned int *progcnt,
|
|
void *progids);
|
|
|
|
int
|
|
virBPFGetProg(unsigned int id);
|
|
|
|
int
|
|
virBPFGetProgInfo(int progfd,
|
|
struct bpf_prog_info *info,
|
|
unsigned int **mapIDs);
|
|
|
|
int
|
|
virBPFGetMap(unsigned int id);
|
|
|
|
int
|
|
virBPFLookupElem(int mapfd,
|
|
void *key,
|
|
void *val);
|
|
|
|
int
|
|
virBPFGetNextElem(int mapfd,
|
|
void *key,
|
|
void *nextKey);
|
|
|
|
int
|
|
virBPFUpdateElem(int mapfd,
|
|
void *key,
|
|
void *val);
|
|
|
|
int
|
|
virBPFDeleteElem(int mapfd,
|
|
void *key);
|