337 lines
13 KiB
C
337 lines
13 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __BPF_HELPERS_H
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#define __BPF_HELPERS_H
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/* helper macro to place programs, maps, license in
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* different sections in elf_bpf file. Section names
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* are interpreted by elf_bpf loader
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*/
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#define SEC(NAME) __attribute__((section(NAME), used))
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/* helper functions called from eBPF programs written in C */
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static void *(*bpf_map_lookup_elem)(void *map, void *key) =
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(void *) BPF_FUNC_map_lookup_elem;
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static int (*bpf_map_update_elem)(void *map, void *key, void *value,
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unsigned long long flags) =
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(void *) BPF_FUNC_map_update_elem;
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static int (*bpf_map_delete_elem)(void *map, void *key) =
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(void *) BPF_FUNC_map_delete_elem;
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static int (*bpf_probe_read)(void *dst, int size, void *unsafe_ptr) =
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(void *) BPF_FUNC_probe_read;
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static unsigned long long (*bpf_ktime_get_ns)(void) =
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(void *) BPF_FUNC_ktime_get_ns;
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static int (*bpf_trace_printk)(const char *fmt, int fmt_size, ...) =
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(void *) BPF_FUNC_trace_printk;
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static void (*bpf_tail_call)(void *ctx, void *map, int index) =
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(void *) BPF_FUNC_tail_call;
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static unsigned long long (*bpf_get_smp_processor_id)(void) =
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(void *) BPF_FUNC_get_smp_processor_id;
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static unsigned long long (*bpf_get_current_pid_tgid)(void) =
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(void *) BPF_FUNC_get_current_pid_tgid;
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static unsigned long long (*bpf_get_current_uid_gid)(void) =
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(void *) BPF_FUNC_get_current_uid_gid;
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static int (*bpf_get_current_comm)(void *buf, int buf_size) =
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(void *) BPF_FUNC_get_current_comm;
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static unsigned long long (*bpf_perf_event_read)(void *map,
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unsigned long long flags) =
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(void *) BPF_FUNC_perf_event_read;
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static int (*bpf_clone_redirect)(void *ctx, int ifindex, int flags) =
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(void *) BPF_FUNC_clone_redirect;
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static int (*bpf_redirect)(int ifindex, int flags) =
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(void *) BPF_FUNC_redirect;
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static int (*bpf_redirect_map)(void *map, int key, int flags) =
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(void *) BPF_FUNC_redirect_map;
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static int (*bpf_perf_event_output)(void *ctx, void *map,
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unsigned long long flags, void *data,
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int size) =
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(void *) BPF_FUNC_perf_event_output;
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static int (*bpf_get_stackid)(void *ctx, void *map, int flags) =
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(void *) BPF_FUNC_get_stackid;
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static int (*bpf_probe_write_user)(void *dst, void *src, int size) =
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(void *) BPF_FUNC_probe_write_user;
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static int (*bpf_current_task_under_cgroup)(void *map, int index) =
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(void *) BPF_FUNC_current_task_under_cgroup;
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static int (*bpf_skb_get_tunnel_key)(void *ctx, void *key, int size, int flags) =
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(void *) BPF_FUNC_skb_get_tunnel_key;
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static int (*bpf_skb_set_tunnel_key)(void *ctx, void *key, int size, int flags) =
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(void *) BPF_FUNC_skb_set_tunnel_key;
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static int (*bpf_skb_get_tunnel_opt)(void *ctx, void *md, int size) =
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(void *) BPF_FUNC_skb_get_tunnel_opt;
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static int (*bpf_skb_set_tunnel_opt)(void *ctx, void *md, int size) =
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(void *) BPF_FUNC_skb_set_tunnel_opt;
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static unsigned long long (*bpf_get_prandom_u32)(void) =
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(void *) BPF_FUNC_get_prandom_u32;
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static int (*bpf_xdp_adjust_head)(void *ctx, int offset) =
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(void *) BPF_FUNC_xdp_adjust_head;
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static int (*bpf_xdp_adjust_meta)(void *ctx, int offset) =
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(void *) BPF_FUNC_xdp_adjust_meta;
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static int (*bpf_get_socket_cookie)(void *ctx) =
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(void *) BPF_FUNC_get_socket_cookie;
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static int (*bpf_setsockopt)(void *ctx, int level, int optname, void *optval,
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int optlen) =
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(void *) BPF_FUNC_setsockopt;
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static int (*bpf_getsockopt)(void *ctx, int level, int optname, void *optval,
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int optlen) =
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(void *) BPF_FUNC_getsockopt;
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static int (*bpf_sock_ops_cb_flags_set)(void *ctx, int flags) =
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(void *) BPF_FUNC_sock_ops_cb_flags_set;
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static int (*bpf_sk_redirect_map)(void *ctx, void *map, int key, int flags) =
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(void *) BPF_FUNC_sk_redirect_map;
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static int (*bpf_sk_redirect_hash)(void *ctx, void *map, void *key, int flags) =
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(void *) BPF_FUNC_sk_redirect_hash;
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static int (*bpf_sock_map_update)(void *map, void *key, void *value,
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unsigned long long flags) =
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(void *) BPF_FUNC_sock_map_update;
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static int (*bpf_sock_hash_update)(void *map, void *key, void *value,
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unsigned long long flags) =
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(void *) BPF_FUNC_sock_hash_update;
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static int (*bpf_perf_event_read_value)(void *map, unsigned long long flags,
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void *buf, unsigned int buf_size) =
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(void *) BPF_FUNC_perf_event_read_value;
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static int (*bpf_perf_prog_read_value)(void *ctx, void *buf,
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unsigned int buf_size) =
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(void *) BPF_FUNC_perf_prog_read_value;
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static int (*bpf_override_return)(void *ctx, unsigned long rc) =
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(void *) BPF_FUNC_override_return;
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static int (*bpf_msg_redirect_map)(void *ctx, void *map, int key, int flags) =
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(void *) BPF_FUNC_msg_redirect_map;
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static int (*bpf_msg_redirect_hash)(void *ctx,
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void *map, void *key, int flags) =
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(void *) BPF_FUNC_msg_redirect_hash;
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static int (*bpf_msg_apply_bytes)(void *ctx, int len) =
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(void *) BPF_FUNC_msg_apply_bytes;
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static int (*bpf_msg_cork_bytes)(void *ctx, int len) =
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(void *) BPF_FUNC_msg_cork_bytes;
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static int (*bpf_msg_pull_data)(void *ctx, int start, int end, int flags) =
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(void *) BPF_FUNC_msg_pull_data;
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static int (*bpf_bind)(void *ctx, void *addr, int addr_len) =
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(void *) BPF_FUNC_bind;
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static int (*bpf_xdp_adjust_tail)(void *ctx, int offset) =
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(void *) BPF_FUNC_xdp_adjust_tail;
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static int (*bpf_skb_get_xfrm_state)(void *ctx, int index, void *state,
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int size, int flags) =
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(void *) BPF_FUNC_skb_get_xfrm_state;
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static int (*bpf_sk_select_reuseport)(void *ctx, void *map, void *key, __u32 flags) =
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(void *) BPF_FUNC_sk_select_reuseport;
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static int (*bpf_get_stack)(void *ctx, void *buf, int size, int flags) =
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(void *) BPF_FUNC_get_stack;
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static int (*bpf_fib_lookup)(void *ctx, struct bpf_fib_lookup *params,
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int plen, __u32 flags) =
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(void *) BPF_FUNC_fib_lookup;
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static int (*bpf_lwt_push_encap)(void *ctx, unsigned int type, void *hdr,
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unsigned int len) =
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(void *) BPF_FUNC_lwt_push_encap;
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static int (*bpf_lwt_seg6_store_bytes)(void *ctx, unsigned int offset,
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void *from, unsigned int len) =
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(void *) BPF_FUNC_lwt_seg6_store_bytes;
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static int (*bpf_lwt_seg6_action)(void *ctx, unsigned int action, void *param,
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unsigned int param_len) =
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(void *) BPF_FUNC_lwt_seg6_action;
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static int (*bpf_lwt_seg6_adjust_srh)(void *ctx, unsigned int offset,
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unsigned int len) =
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(void *) BPF_FUNC_lwt_seg6_adjust_srh;
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static int (*bpf_rc_repeat)(void *ctx) =
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(void *) BPF_FUNC_rc_repeat;
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static int (*bpf_rc_keydown)(void *ctx, unsigned int protocol,
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unsigned long long scancode, unsigned int toggle) =
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(void *) BPF_FUNC_rc_keydown;
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static unsigned long long (*bpf_get_current_cgroup_id)(void) =
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(void *) BPF_FUNC_get_current_cgroup_id;
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static void *(*bpf_get_local_storage)(void *map, unsigned long long flags) =
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(void *) BPF_FUNC_get_local_storage;
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static unsigned long long (*bpf_skb_cgroup_id)(void *ctx) =
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(void *) BPF_FUNC_skb_cgroup_id;
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static unsigned long long (*bpf_skb_ancestor_cgroup_id)(void *ctx, int level) =
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(void *) BPF_FUNC_skb_ancestor_cgroup_id;
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/* llvm builtin functions that eBPF C program may use to
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* emit BPF_LD_ABS and BPF_LD_IND instructions
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*/
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struct sk_buff;
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unsigned long long load_byte(void *skb,
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unsigned long long off) asm("llvm.bpf.load.byte");
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unsigned long long load_half(void *skb,
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unsigned long long off) asm("llvm.bpf.load.half");
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unsigned long long load_word(void *skb,
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unsigned long long off) asm("llvm.bpf.load.word");
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/* a helper structure used by eBPF C program
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* to describe map attributes to elf_bpf loader
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*/
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struct bpf_map_def {
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unsigned int type;
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unsigned int key_size;
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unsigned int value_size;
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unsigned int max_entries;
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unsigned int map_flags;
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unsigned int inner_map_idx;
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unsigned int numa_node;
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};
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#define BPF_ANNOTATE_KV_PAIR(name, type_key, type_val) \
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struct ____btf_map_##name { \
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type_key key; \
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type_val value; \
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}; \
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struct ____btf_map_##name \
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__attribute__ ((section(".maps." #name), used)) \
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____btf_map_##name = { }
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static int (*bpf_skb_load_bytes)(void *ctx, int off, void *to, int len) =
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(void *) BPF_FUNC_skb_load_bytes;
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static int (*bpf_skb_load_bytes_relative)(void *ctx, int off, void *to, int len, __u32 start_header) =
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(void *) BPF_FUNC_skb_load_bytes_relative;
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static int (*bpf_skb_store_bytes)(void *ctx, int off, void *from, int len, int flags) =
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(void *) BPF_FUNC_skb_store_bytes;
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static int (*bpf_l3_csum_replace)(void *ctx, int off, int from, int to, int flags) =
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(void *) BPF_FUNC_l3_csum_replace;
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static int (*bpf_l4_csum_replace)(void *ctx, int off, int from, int to, int flags) =
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(void *) BPF_FUNC_l4_csum_replace;
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static int (*bpf_csum_diff)(void *from, int from_size, void *to, int to_size, int seed) =
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(void *) BPF_FUNC_csum_diff;
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static int (*bpf_skb_under_cgroup)(void *ctx, void *map, int index) =
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(void *) BPF_FUNC_skb_under_cgroup;
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static int (*bpf_skb_change_head)(void *, int len, int flags) =
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(void *) BPF_FUNC_skb_change_head;
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static int (*bpf_skb_pull_data)(void *, int len) =
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(void *) BPF_FUNC_skb_pull_data;
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/* Scan the ARCH passed in from ARCH env variable (see Makefile) */
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#if defined(__TARGET_ARCH_x86)
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#define bpf_target_x86
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#define bpf_target_defined
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#elif defined(__TARGET_ARCH_s930x)
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#define bpf_target_s930x
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#define bpf_target_defined
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#elif defined(__TARGET_ARCH_arm64)
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#define bpf_target_arm64
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#define bpf_target_defined
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#elif defined(__TARGET_ARCH_mips)
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#define bpf_target_mips
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#define bpf_target_defined
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#elif defined(__TARGET_ARCH_powerpc)
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#define bpf_target_powerpc
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#define bpf_target_defined
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#elif defined(__TARGET_ARCH_sparc)
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#define bpf_target_sparc
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#define bpf_target_defined
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#else
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#undef bpf_target_defined
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#endif
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/* Fall back to what the compiler says */
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#ifndef bpf_target_defined
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#if defined(__x86_64__)
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#define bpf_target_x86
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#elif defined(__s390x__)
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#define bpf_target_s930x
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#elif defined(__aarch64__)
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#define bpf_target_arm64
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#elif defined(__mips__)
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#define bpf_target_mips
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#elif defined(__powerpc__)
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#define bpf_target_powerpc
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#elif defined(__sparc__)
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#define bpf_target_sparc
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#endif
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#endif
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#if defined(bpf_target_x86)
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#define PT_REGS_PARM1(x) ((x)->di)
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#define PT_REGS_PARM2(x) ((x)->si)
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#define PT_REGS_PARM3(x) ((x)->dx)
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#define PT_REGS_PARM4(x) ((x)->cx)
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#define PT_REGS_PARM5(x) ((x)->r8)
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#define PT_REGS_RET(x) ((x)->sp)
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#define PT_REGS_FP(x) ((x)->bp)
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#define PT_REGS_RC(x) ((x)->ax)
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#define PT_REGS_SP(x) ((x)->sp)
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#define PT_REGS_IP(x) ((x)->ip)
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#elif defined(bpf_target_s390x)
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#define PT_REGS_PARM1(x) ((x)->gprs[2])
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#define PT_REGS_PARM2(x) ((x)->gprs[3])
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#define PT_REGS_PARM3(x) ((x)->gprs[4])
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#define PT_REGS_PARM4(x) ((x)->gprs[5])
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#define PT_REGS_PARM5(x) ((x)->gprs[6])
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#define PT_REGS_RET(x) ((x)->gprs[14])
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#define PT_REGS_FP(x) ((x)->gprs[11]) /* Works only with CONFIG_FRAME_POINTER */
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#define PT_REGS_RC(x) ((x)->gprs[2])
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#define PT_REGS_SP(x) ((x)->gprs[15])
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#define PT_REGS_IP(x) ((x)->psw.addr)
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#elif defined(bpf_target_arm64)
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#define PT_REGS_PARM1(x) ((x)->regs[0])
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#define PT_REGS_PARM2(x) ((x)->regs[1])
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#define PT_REGS_PARM3(x) ((x)->regs[2])
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#define PT_REGS_PARM4(x) ((x)->regs[3])
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#define PT_REGS_PARM5(x) ((x)->regs[4])
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#define PT_REGS_RET(x) ((x)->regs[30])
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#define PT_REGS_FP(x) ((x)->regs[29]) /* Works only with CONFIG_FRAME_POINTER */
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#define PT_REGS_RC(x) ((x)->regs[0])
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#define PT_REGS_SP(x) ((x)->sp)
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#define PT_REGS_IP(x) ((x)->pc)
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#elif defined(bpf_target_mips)
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#define PT_REGS_PARM1(x) ((x)->regs[4])
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#define PT_REGS_PARM2(x) ((x)->regs[5])
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#define PT_REGS_PARM3(x) ((x)->regs[6])
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#define PT_REGS_PARM4(x) ((x)->regs[7])
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#define PT_REGS_PARM5(x) ((x)->regs[8])
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#define PT_REGS_RET(x) ((x)->regs[31])
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#define PT_REGS_FP(x) ((x)->regs[30]) /* Works only with CONFIG_FRAME_POINTER */
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#define PT_REGS_RC(x) ((x)->regs[1])
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#define PT_REGS_SP(x) ((x)->regs[29])
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#define PT_REGS_IP(x) ((x)->cp0_epc)
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#elif defined(bpf_target_powerpc)
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#define PT_REGS_PARM1(x) ((x)->gpr[3])
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#define PT_REGS_PARM2(x) ((x)->gpr[4])
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#define PT_REGS_PARM3(x) ((x)->gpr[5])
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#define PT_REGS_PARM4(x) ((x)->gpr[6])
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#define PT_REGS_PARM5(x) ((x)->gpr[7])
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#define PT_REGS_RC(x) ((x)->gpr[3])
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#define PT_REGS_SP(x) ((x)->sp)
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#define PT_REGS_IP(x) ((x)->nip)
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#elif defined(bpf_target_sparc)
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#define PT_REGS_PARM1(x) ((x)->u_regs[UREG_I0])
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#define PT_REGS_PARM2(x) ((x)->u_regs[UREG_I1])
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#define PT_REGS_PARM3(x) ((x)->u_regs[UREG_I2])
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#define PT_REGS_PARM4(x) ((x)->u_regs[UREG_I3])
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#define PT_REGS_PARM5(x) ((x)->u_regs[UREG_I4])
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#define PT_REGS_RET(x) ((x)->u_regs[UREG_I7])
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#define PT_REGS_RC(x) ((x)->u_regs[UREG_I0])
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#define PT_REGS_SP(x) ((x)->u_regs[UREG_FP])
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/* Should this also be a bpf_target check for the sparc case? */
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#if defined(__arch64__)
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#define PT_REGS_IP(x) ((x)->tpc)
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#else
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#define PT_REGS_IP(x) ((x)->pc)
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#endif
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#endif
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#ifdef bpf_target_powerpc
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#define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = (ctx)->link; })
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#define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP
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#elif bpf_target_sparc
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#define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ (ip) = PT_REGS_RET(ctx); })
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#define BPF_KRETPROBE_READ_RET_IP BPF_KPROBE_READ_RET_IP
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#else
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#define BPF_KPROBE_READ_RET_IP(ip, ctx) ({ \
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bpf_probe_read(&(ip), sizeof(ip), (void *)PT_REGS_RET(ctx)); })
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#define BPF_KRETPROBE_READ_RET_IP(ip, ctx) ({ \
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bpf_probe_read(&(ip), sizeof(ip), \
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(void *)(PT_REGS_FP(ctx) + sizeof(ip))); })
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#endif
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#endif
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