| /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of version 2 of the GNU General Public |
| * License as published by the Free Software Foundation. |
| */ |
| #ifndef _UAPI__LINUX_BPF_H__ |
| #define _UAPI__LINUX_BPF_H__ |
| |
| #include <linux/types.h> |
| #include <linux/bpf_common.h> |
| |
| /* Extended instruction set based on top of classic BPF */ |
| |
| /* instruction classes */ |
| #define BPF_ALU64 0x07 /* alu mode in double word width */ |
| |
| /* ld/ldx fields */ |
| #define BPF_DW 0x18 /* double word */ |
| #define BPF_XADD 0xc0 /* exclusive add */ |
| |
| /* alu/jmp fields */ |
| #define BPF_MOV 0xb0 /* mov reg to reg */ |
| #define BPF_ARSH 0xc0 /* sign extending arithmetic shift right */ |
| |
| /* change endianness of a register */ |
| #define BPF_END 0xd0 /* flags for endianness conversion: */ |
| #define BPF_TO_LE 0x00 /* convert to little-endian */ |
| #define BPF_TO_BE 0x08 /* convert to big-endian */ |
| #define BPF_FROM_LE BPF_TO_LE |
| #define BPF_FROM_BE BPF_TO_BE |
| |
| #define BPF_JNE 0x50 /* jump != */ |
| #define BPF_JSGT 0x60 /* SGT is signed '>', GT in x86 */ |
| #define BPF_JSGE 0x70 /* SGE is signed '>=', GE in x86 */ |
| #define BPF_CALL 0x80 /* function call */ |
| #define BPF_EXIT 0x90 /* function return */ |
| |
| /* Register numbers */ |
| enum { |
| BPF_REG_0 = 0, |
| BPF_REG_1, |
| BPF_REG_2, |
| BPF_REG_3, |
| BPF_REG_4, |
| BPF_REG_5, |
| BPF_REG_6, |
| BPF_REG_7, |
| BPF_REG_8, |
| BPF_REG_9, |
| BPF_REG_10, |
| __MAX_BPF_REG, |
| }; |
| |
| /* BPF has 10 general purpose 64-bit registers and stack frame. */ |
| #define MAX_BPF_REG __MAX_BPF_REG |
| |
| struct bpf_insn { |
| __u8 code; /* opcode */ |
| __u8 dst_reg:4; /* dest register */ |
| __u8 src_reg:4; /* source register */ |
| __s16 off; /* signed offset */ |
| __s32 imm; /* signed immediate constant */ |
| }; |
| |
| /* BPF syscall commands, see bpf(2) man-page for details. */ |
| enum bpf_cmd { |
| BPF_MAP_CREATE, |
| BPF_MAP_LOOKUP_ELEM, |
| BPF_MAP_UPDATE_ELEM, |
| BPF_MAP_DELETE_ELEM, |
| BPF_MAP_GET_NEXT_KEY, |
| BPF_PROG_LOAD, |
| BPF_OBJ_PIN, |
| BPF_OBJ_GET, |
| }; |
| |
| enum bpf_map_type { |
| BPF_MAP_TYPE_UNSPEC, |
| BPF_MAP_TYPE_HASH, |
| BPF_MAP_TYPE_ARRAY, |
| BPF_MAP_TYPE_PROG_ARRAY, |
| BPF_MAP_TYPE_PERF_EVENT_ARRAY, |
| }; |
| |
| enum bpf_prog_type { |
| BPF_PROG_TYPE_UNSPEC, |
| BPF_PROG_TYPE_SOCKET_FILTER, |
| BPF_PROG_TYPE_KPROBE, |
| BPF_PROG_TYPE_SCHED_CLS, |
| BPF_PROG_TYPE_SCHED_ACT, |
| }; |
| |
| #define BPF_PSEUDO_MAP_FD 1 |
| |
| /* flags for BPF_MAP_UPDATE_ELEM command */ |
| #define BPF_ANY 0 /* create new element or update existing */ |
| #define BPF_NOEXIST 1 /* create new element if it didn't exist */ |
| #define BPF_EXIST 2 /* update existing element */ |
| |
| union bpf_attr { |
| struct { /* anonymous struct used by BPF_MAP_CREATE command */ |
| __u32 map_type; /* one of enum bpf_map_type */ |
| __u32 key_size; /* size of key in bytes */ |
| __u32 value_size; /* size of value in bytes */ |
| __u32 max_entries; /* max number of entries in a map */ |
| }; |
| |
| struct { /* anonymous struct used by BPF_MAP_*_ELEM commands */ |
| __u32 map_fd; |
| __aligned_u64 key; |
| union { |
| __aligned_u64 value; |
| __aligned_u64 next_key; |
| }; |
| __u64 flags; |
| }; |
| |
| struct { /* anonymous struct used by BPF_PROG_LOAD command */ |
| __u32 prog_type; /* one of enum bpf_prog_type */ |
| __u32 insn_cnt; |
| __aligned_u64 insns; |
| __aligned_u64 license; |
| __u32 log_level; /* verbosity level of verifier */ |
| __u32 log_size; /* size of user buffer */ |
| __aligned_u64 log_buf; /* user supplied buffer */ |
| __u32 kern_version; /* checked when prog_type=kprobe */ |
| }; |
| |
| struct { /* anonymous struct used by BPF_OBJ_* commands */ |
| __aligned_u64 pathname; |
| __u32 bpf_fd; |
| }; |
| } __attribute__((aligned(8))); |
| |
| /* integer value in 'imm' field of BPF_CALL instruction selects which helper |
| * function eBPF program intends to call |
| */ |
| enum bpf_func_id { |
| BPF_FUNC_unspec, |
| BPF_FUNC_map_lookup_elem, /* void *map_lookup_elem(&map, &key) */ |
| BPF_FUNC_map_update_elem, /* int map_update_elem(&map, &key, &value, flags) */ |
| BPF_FUNC_map_delete_elem, /* int map_delete_elem(&map, &key) */ |
| BPF_FUNC_probe_read, /* int bpf_probe_read(void *dst, int size, void *src) */ |
| BPF_FUNC_ktime_get_ns, /* u64 bpf_ktime_get_ns(void) */ |
| BPF_FUNC_trace_printk, /* int bpf_trace_printk(const char *fmt, int fmt_size, ...) */ |
| BPF_FUNC_get_prandom_u32, /* u32 prandom_u32(void) */ |
| BPF_FUNC_get_smp_processor_id, /* u32 raw_smp_processor_id(void) */ |
| |
| /** |
| * skb_store_bytes(skb, offset, from, len, flags) - store bytes into packet |
| * @skb: pointer to skb |
| * @offset: offset within packet from skb->mac_header |
| * @from: pointer where to copy bytes from |
| * @len: number of bytes to store into packet |
| * @flags: bit 0 - if true, recompute skb->csum |
| * other bits - reserved |
| * Return: 0 on success |
| */ |
| BPF_FUNC_skb_store_bytes, |
| |
| /** |
| * l3_csum_replace(skb, offset, from, to, flags) - recompute IP checksum |
| * @skb: pointer to skb |
| * @offset: offset within packet where IP checksum is located |
| * @from: old value of header field |
| * @to: new value of header field |
| * @flags: bits 0-3 - size of header field |
| * other bits - reserved |
| * Return: 0 on success |
| */ |
| BPF_FUNC_l3_csum_replace, |
| |
| /** |
| * l4_csum_replace(skb, offset, from, to, flags) - recompute TCP/UDP checksum |
| * @skb: pointer to skb |
| * @offset: offset within packet where TCP/UDP checksum is located |
| * @from: old value of header field |
| * @to: new value of header field |
| * @flags: bits 0-3 - size of header field |
| * bit 4 - is pseudo header |
| * other bits - reserved |
| * Return: 0 on success |
| */ |
| BPF_FUNC_l4_csum_replace, |
| |
| /** |
| * bpf_tail_call(ctx, prog_array_map, index) - jump into another BPF program |
| * @ctx: context pointer passed to next program |
| * @prog_array_map: pointer to map which type is BPF_MAP_TYPE_PROG_ARRAY |
| * @index: index inside array that selects specific program to run |
| * Return: 0 on success |
| */ |
| BPF_FUNC_tail_call, |
| |
| /** |
| * bpf_clone_redirect(skb, ifindex, flags) - redirect to another netdev |
| * @skb: pointer to skb |
| * @ifindex: ifindex of the net device |
| * @flags: bit 0 - if set, redirect to ingress instead of egress |
| * other bits - reserved |
| * Return: 0 on success |
| */ |
| BPF_FUNC_clone_redirect, |
| |
| /** |
| * u64 bpf_get_current_pid_tgid(void) |
| * Return: current->tgid << 32 | current->pid |
| */ |
| BPF_FUNC_get_current_pid_tgid, |
| |
| /** |
| * u64 bpf_get_current_uid_gid(void) |
| * Return: current_gid << 32 | current_uid |
| */ |
| BPF_FUNC_get_current_uid_gid, |
| |
| /** |
| * bpf_get_current_comm(char *buf, int size_of_buf) |
| * stores current->comm into buf |
| * Return: 0 on success |
| */ |
| BPF_FUNC_get_current_comm, |
| |
| /** |
| * bpf_get_cgroup_classid(skb) - retrieve a proc's classid |
| * @skb: pointer to skb |
| * Return: classid if != 0 |
| */ |
| BPF_FUNC_get_cgroup_classid, |
| BPF_FUNC_skb_vlan_push, /* bpf_skb_vlan_push(skb, vlan_proto, vlan_tci) */ |
| BPF_FUNC_skb_vlan_pop, /* bpf_skb_vlan_pop(skb) */ |
| |
| /** |
| * bpf_skb_[gs]et_tunnel_key(skb, key, size, flags) |
| * retrieve or populate tunnel metadata |
| * @skb: pointer to skb |
| * @key: pointer to 'struct bpf_tunnel_key' |
| * @size: size of 'struct bpf_tunnel_key' |
| * @flags: room for future extensions |
| * Retrun: 0 on success |
| */ |
| BPF_FUNC_skb_get_tunnel_key, |
| BPF_FUNC_skb_set_tunnel_key, |
| BPF_FUNC_perf_event_read, /* u64 bpf_perf_event_read(&map, index) */ |
| /** |
| * bpf_redirect(ifindex, flags) - redirect to another netdev |
| * @ifindex: ifindex of the net device |
| * @flags: bit 0 - if set, redirect to ingress instead of egress |
| * other bits - reserved |
| * Return: TC_ACT_REDIRECT |
| */ |
| BPF_FUNC_redirect, |
| |
| /** |
| * bpf_get_route_realm(skb) - retrieve a dst's tclassid |
| * @skb: pointer to skb |
| * Return: realm if != 0 |
| */ |
| BPF_FUNC_get_route_realm, |
| |
| /** |
| * bpf_perf_event_output(ctx, map, index, data, size) - output perf raw sample |
| * @ctx: struct pt_regs* |
| * @map: pointer to perf_event_array map |
| * @index: index of event in the map |
| * @data: data on stack to be output as raw data |
| * @size: size of data |
| * Return: 0 on success |
| */ |
| BPF_FUNC_perf_event_output, |
| __BPF_FUNC_MAX_ID, |
| }; |
| |
| /* user accessible mirror of in-kernel sk_buff. |
| * new fields can only be added to the end of this structure |
| */ |
| struct __sk_buff { |
| __u32 len; |
| __u32 pkt_type; |
| __u32 mark; |
| __u32 queue_mapping; |
| __u32 protocol; |
| __u32 vlan_present; |
| __u32 vlan_tci; |
| __u32 vlan_proto; |
| __u32 priority; |
| __u32 ingress_ifindex; |
| __u32 ifindex; |
| __u32 tc_index; |
| __u32 cb[5]; |
| __u32 hash; |
| __u32 tc_classid; |
| }; |
| |
| struct bpf_tunnel_key { |
| __u32 tunnel_id; |
| __u32 remote_ipv4; |
| }; |
| |
| #endif /* _UAPI__LINUX_BPF_H__ */ |
