/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __BPF_HELPERS_H #define __BPF_HELPERS_H /* helper macro to place programs, maps, license in * different sections in elf_bpf file. Section names * are interpreted by elf_bpf loader */ #define SEC(NAME) __attribute__((section(NAME), used)) /* helper functions called from eBPF programs written in C */ static void *(*bpf_map_lookup_elem)(void *map, void *key) = (void *) BPF_FUNC_map_lookup_elem; static int (*bpf_map_update_elem)(void *map, void *key, void *value, unsigned long long flags) = (void *) BPF_FUNC_map_update_elem; static int (*bpf_map_delete_elem)(void *map, void *key) = (void *) BPF_FUNC_map_delete_elem; static int (*bpf_probe_read)(void *dst, int size, void *unsafe_ptr) = (void *) BPF_FUNC_probe_read; static unsigned long long (*bpf_ktime_get_ns)(void) = (void *) BPF_FUNC_ktime_get_ns; static int (*bpf_trace_printk)(const char *fmt, int fmt_size, ...) = (void *) BPF_FUNC_trace_printk; static void (*bpf_tail_call)(void *ctx, void *map, int index) = (void *) BPF_FUNC_tail_call; static unsigned long long (*bpf_get_smp_processor_id)(void) = (void *) BPF_FUNC_get_smp_processor_id; static unsigned long long (*bpf_get_current_pid_tgid)(void) = (void *) BPF_FUNC_get_current_pid_tgid; static unsigned long long (*bpf_get_current_uid_gid)(void) = (void *) BPF_FUNC_get_current_uid_gid; static int (*bpf_get_current_comm)(void *buf, int buf_size) = (void *) BPF_FUNC_get_current_comm; static unsigned long long (*bpf_perf_event_read)(void *map, unsigned long long flags) = (void *) BPF_FUNC_perf_event_read; static int (*bpf_clone_redirect)(void *ctx, int ifindex, int flags) = (void *) BPF_FUNC_clone_redirect; static int (*bpf_redirect)(int ifindex, int flags) = (void *) BPF_FUNC_redirect; static int (*bpf_redirect_map)(void *map, int key, int flags) = (void *) BPF_FUNC_redirect_map; static int (*bpf_perf_event_output)(void *ctx, void *map, unsigned long long flags, void *data, int size) = (void *) BPF_FUNC_perf_event_output; static int (*bpf_get_stackid)(void *ctx, void *map, int flags) = (void *) BPF_FUNC_get_stackid; static int (*bpf_probe_write_user)(void *dst, void *src, int size) = (void *) BPF_FUNC_probe_write_user; static int (*bpf_current_task_under_cgroup)(void *map, int index) = (void *) BPF_FUNC_current_task_under_cgroup; static int (*bpf_skb_get_tunnel_key)(void *ctx, void *key, int size, int flags) = (void *) BPF_FUNC_skb_get_tunnel_key; static int (*bpf_skb_set_tunnel_key)(void *ctx, void *key, int size, int flags) = (void *) BPF_FUNC_skb_set_tunnel_key; static int (*bpf_skb_get_tunnel_opt)(void *ctx, void *md, int size) = (void *) BPF_FUNC_skb_get_tunnel_opt; static int (*bpf_skb_set_tunnel_opt)(void *ctx, void *md, int size) = (void *) BPF_FUNC_skb_set_tunnel_opt; static unsigned long long (*bpf_get_prandom_u32)(void) = (void *) BPF_FUNC_get_prandom_u32; static int (*bpf_xdp_adjust_head)(void *ctx, int offset) = (void *) BPF_FUNC_xdp_adjust_head; static int (*bpf_xdp_adjust_meta)(void *ctx, int offset) = (void *) BPF_FUNC_xdp_adjust_meta; static int (*bpf_setsockopt)(void *ctx, int level, int optname, void *optval, int optlen) = (void *) BPF_FUNC_setsockopt; static int (*bpf_getsockopt)(void *ctx, int level, int optname, void *optval, int optlen) = (void *) BPF_FUNC_getsockopt; static int (*bpf_sock_ops_cb_flags_set)(void *ctx, int flags) = (void *) BPF_FUNC_sock_ops_cb_flags_set; static int (*bpf_sk_redirect_map)(void *ctx, void *map, int key, int flags) = (void *) BPF_FUNC_sk_redirect_map; static int (*bpf_sock_map_update)(void *map, void *key, void *value, unsigned long long flags) = (void *) BPF_FUNC_sock_map_update; static int (*bpf_perf_event_read_value)(void *map, unsigned long long flags, void *buf, unsigned int buf_size) = (void *) BPF_FUNC_perf_event_read_value; static int (*bpf_perf_prog_read_value)(void *ctx, void *buf, unsigned int buf_size) = (void *) BPF_FUNC_perf_prog_read_value; static int (*bpf_override_return)(void *ctx, unsigned long rc) = (void *) BPF_FUNC_override_return; static int (*bpf_msg_redirect_map)(void *ctx, void *map, int key, int flags) = (void *) BPF_FUNC_msg_redirect_map; /* llvm builtin functions that eBPF C program may use to * emit BPF_LD_ABS and BPF_LD_IND instructions */ struct sk_buff; unsigned long long load_byte(void *skb, unsigned long long off) asm("llvm.bpf.load.byte"); unsigned long long load_half(void *skb, unsigned long long off) asm("llvm.bpf.load.half"); unsigned long long load_word(void *skb, unsigned long long off) asm("llvm.bpf.load.word"); /* a helper structure used by eBPF C program * to describe map attributes to elf_bpf loader */ struct bpf_map_def { unsigned int type; unsigned int key_size; unsigned int value_size; unsigned int max_entries; unsigned int map_flags; unsigned int inner_map_idx; unsigned int numa_node; }; static int (*bpf_skb_load_bytes)(void *ctx, int off, void *to, int len) = (void *) BPF_FUNC_skb_load_bytes; static int (*bpf_skb_store_bytes)(void *ctx, int off, void *from, int len, int flags) = (void *) BPF_FUNC_skb_store_bytes; static int (*bpf_l3_csum_replace)(void *ctx, int off, int from, int to, int flags) = (void *) BPF_FUNC_l3_csum_replace; static int (*bpf_l4_csum_replace)(void *ctx, int off, int from, int to, int flags) = (void *) BPF_FUNC_l4_csum_replace; static int (*bpf_skb_under_cgroup)(void *ctx, void *map, int index) = (void *) BPF_FUNC_skb_under_cgroup; static int (*bpf_skb_change_head)(void *, int len, int flags) = (void *) BPF_FUNC_skb_change_head; static int (*bpf_skb_pull_data)(void *, int len) = (void *) BPF_FUNC_skb_pull_data; /* Scan the ARCH passed in from ARCH env variable (see Makefile) */ #if defined(__TARGET_ARCH_x86) #define bpf_target_x86 #define bpf_target_defined #elif defined(__TARGET_ARCH_s930x) #define bpf_target_s930x #define bpf_target_defined #elif defined(__TARGET_ARCH_arm64) #define bpf_target_arm64 #define bpf_target_defined #elif defined(__TARGET_ARCH_mips) #define bpf_target_mips #define bpf_target_defined #elif defined(__TARGET_ARCH_powerpc) #define bpf_target_powerpc #define bpf_target_defined #elif defined(__TARGET_ARCH_sparc) #define bpf_target_sparc #define bpf_target_defined #else #undef bpf_target_defined #endif /* Fall back to what the compiler says */ #ifndef bpf_target_defined #if defined(__x86_64__) #define bpf_target_x86 #elif defined(__s390x__) #define bpf_target_s930x #elif defined(__aarch64__) #define bpf_target_arm64 #elif defined(__mips__) #define bpf_target_mips #elif defined(__powerpc__) #define bpf_target_powerpc #elif defined(__sparc__) #define bpf_target_sparc #endif #endif #if defined(bpf_target_x86) #define PT_REGS_PARM1(x) ((x)->di) #define PT_REGS_PARM2(x) ((x)->si) #define PT_REGS_PARM3(x) ((x)->dx) #define PT_REGS_PARM4(x) ((x)->cx) #define PT_REGS_PARM5(x) ((x)->r8) #define PT_REGS_RET(x) ((x)->sp) #define PT_REGS_FP(x) ((x)->bp) #define PT_REGS_RC(x) ((x)->ax) #define PT_REGS_SP(x) ((x)->sp) #define PT_REGS_IP(x) ((x)->ip) #elif defined(bpf_target_s390x) #define PT_REGS_PARM1(x) ((x)->gprs[2]) #define PT_REGS_PARM2(x) ((x)->gprs[3]) #define PT_REGS_PARM3(x) ((x)->gprs[4]) #define PT_REGS_PARM4(x) ((x)->gprs[5]) #define PT_REGS_PARM5(x) ((x)->gprs[6]) #define PT_REGS_RET(x) ((x)->gprs[14]) #define PT_REGS_FP(x) ((x)->gprs[11]) /* Works only with CONFIG_FRAME_POINTER */ #define PT_REGS_RC(x) ((x)->gprs[2]) #define PT_REGS_SP(x) ((x)->gprs[15]) #define PT_REGS_IP(x) ((x)->psw.addr) #elif defined(bpf_target_arm64) #define PT_REGS_PARM1(x) ((x)->regs[0]) #define PT_REGS_PARM2(x) ((x)->regs[1]) #define PT_REGS_PARM3(x) ((x)->regs[2]) #define PT_REGS_PARM4(x) ((x)->regs[3]) #define PT_REGS_PARM5(x) ((x)->regs[4]) #define PT_REGS_RET(x) ((x)->regs[30]) #define PT_REGS_FP(x) ((x)->regs[29]) /* Works only with CONFIG_FRAME_POINTER */ #define PT_REGS_RC(x) ((x)->regs[0]) #define PT_REGS_SP(x) ((x)->sp) #define PT_REGS_IP(x) ((x)->pc) #elif defined(bpf_target_mips) #define PT_REGS_PARM1(x) ((x)->regs[4]) #define PT_REGS_PARM2(x) ((x)->regs[5]) #define PT_REGS_PARM3(x) ((x)->regs[6]) #define PT_REGS_PARM4(x) ((x)->regs[7]) #define PT_REGS_PARM5(x) ((x)->regs[8]) #define PT_REGS_RET(x) ((x)->regs[31]) #define PT_REGS_FP(x) ((x)->regs[30]) /* Works only with CONFIG_FRAME_POINTER */ #define PT_REGS_RC(x) ((x)->regs[1]) #define PT_REGS_SP(x) ((x)->regs[29]) #define PT_REGS_IP(x) ((x)->cp0_epc) #elif defined(bpf_target_powerpc) #define PT_REGS_PARM1(x) ((x)->gpr[3]) #define PT_REGS_PARM2(x) ((x)->gpr[4]) #define PT_REGS_PARM3(x) ((x)->gpr[5]) #define PT_REGS_PARM4(x) ((x)->gpr[6]) #define PT_REGS_PARM5(x) ((x)->gpr[7]) #define PT_REGS_RC(x) ((x)->gpr[3]) #define PT_REGS_SP(x) ((x)->sp) #define PT_REGS_IP(x) ((x)->nip) #elif defined(bpf_target_sparc) #define PT_REGS_PARM1(x) ((x)->u_regs[UREG_I0]) #define PT_REGS_PARM2(x) ((x)->u_regs[UREG_I1]) #define PT_REGS_PARM3(x) ((x)->u_regs[UREG_I2]) #define PT_REGS_PARM4(x) ((x)->u_regs[UREG_I3]) #define PT_REGS_PARM5(x) ((x)->u_regs[UREG_I4]) #define PT_REGS_RET(x) ((x)->u_regs[UREG_I7]) #define PT_REGS_RC(x) ((x)->u_regs[UREG_I0]) #define PT_REGS_SP(x) ((x)->u_regs[UREG_FP]) /* Should this also be a bpf_target check for the sparc case? */ #if defined(__arch64__) #define PT_REGS_IP(x) ((x)->tpc) #else #define PT_REGS_IP(x) ((x)->pc) #endif #endif #ifdef bpf_target_powerpc #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = (ctx)->link; }) #define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP #elif bpf_target_sparc #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = PT_REGS_RET(ctx); }) #define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP #else #define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ \ bpf_probe_read(&(ip), sizeof(ip), (void *)PT_REGS_RET(ctx)); }) #define BPF_KRETPROBE_READ_RET_IP(ip, ctx) ({ \ bpf_probe_read(&(ip), sizeof(ip), \ (void *)(PT_REGS_FP(ctx) + sizeof(ip))); }) #endif #endif