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/*
* 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
#ifdef __linux__
# 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 /* ! __linux__ */
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 /* ! __linux__ */
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);
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