/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note *//* 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 (64-bit) */#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 /* jmp encodings */#define BPF_JNE 0x50 /* jump != */#define BPF_JLT 0xa0 /* LT is unsigned, '<' */#define BPF_JLE 0xb0 /* LE is unsigned, '<=' */#define BPF_JSGT 0x60 /* SGT is signed '>', GT in x86 */#define BPF_JSGE 0x70 /* SGE is signed '>=', GE in x86 */#define BPF_JSLT 0xc0 /* SLT is signed, '<' */#define BPF_JSLE 0xd0 /* SLE is signed, '<=' */#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 */}; /* Key of an a BPF_MAP_TYPE_LPM_TRIE entry */struct bpf_lpm_trie_key { __u32 prefixlen; /* up to 32 for AF_INET, 128 for AF_INET6 */ __u8 data[0]; /* Arbitrary size */}; /* 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, BPF_PROG_ATTACH, BPF_PROG_DETACH, BPF_PROG_TEST_RUN, BPF_PROG_GET_NEXT_ID, BPF_MAP_GET_NEXT_ID, BPF_PROG_GET_FD_BY_ID, BPF_MAP_GET_FD_BY_ID, BPF_OBJ_GET_INFO_BY_FD, BPF_PROG_QUERY, BPF_RAW_TRACEPOINT_OPEN,}; 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, BPF_MAP_TYPE_PERCPU_HASH, BPF_MAP_TYPE_PERCPU_ARRAY, BPF_MAP_TYPE_STACK_TRACE, BPF_MAP_TYPE_CGROUP_ARRAY, BPF_MAP_TYPE_LRU_HASH, BPF_MAP_TYPE_LRU_PERCPU_HASH, BPF_MAP_TYPE_LPM_TRIE, BPF_MAP_TYPE_ARRAY_OF_MAPS, BPF_MAP_TYPE_HASH_OF_MAPS, BPF_MAP_TYPE_DEVMAP, BPF_MAP_TYPE_SOCKMAP, BPF_MAP_TYPE_CPUMAP,}; 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, BPF_PROG_TYPE_TRACEPOINT, BPF_PROG_TYPE_XDP, BPF_PROG_TYPE_PERF_EVENT, BPF_PROG_TYPE_CGROUP_SKB, BPF_PROG_TYPE_CGROUP_SOCK, BPF_PROG_TYPE_LWT_IN, BPF_PROG_TYPE_LWT_OUT, BPF_PROG_TYPE_LWT_XMIT, BPF_PROG_TYPE_SOCK_OPS, BPF_PROG_TYPE_SK_SKB, BPF_PROG_TYPE_CGROUP_DEVICE, BPF_PROG_TYPE_SK_MSG, BPF_PROG_TYPE_RAW_TRACEPOINT, BPF_PROG_TYPE_CGROUP_SOCK_ADDR,}; enum bpf_attach_type { BPF_CGROUP_INET_INGRESS, BPF_CGROUP_INET_EGRESS, BPF_CGROUP_INET_SOCK_CREATE, BPF_CGROUP_SOCK_OPS, BPF_SK_SKB_STREAM_PARSER, BPF_SK_SKB_STREAM_VERDICT, BPF_CGROUP_DEVICE, BPF_SK_MSG_VERDICT, BPF_CGROUP_INET4_BIND, BPF_CGROUP_INET6_BIND, BPF_CGROUP_INET4_CONNECT, BPF_CGROUP_INET6_CONNECT, BPF_CGROUP_INET4_POST_BIND, BPF_CGROUP_INET6_POST_BIND, __MAX_BPF_ATTACH_TYPE}; #define MAX_BPF_ATTACH_TYPE __MAX_BPF_ATTACH_TYPE /* cgroup-bpf attach flags used in BPF_PROG_ATTACH command * * NONE(default): No further bpf programs allowed in the subtree. * * BPF_F_ALLOW_OVERRIDE: If a sub-cgroup installs some bpf program, * the program in this cgroup yields to sub-cgroup program. * * BPF_F_ALLOW_MULTI: If a sub-cgroup installs some bpf program, * that cgroup program gets run in addition to the program in this cgroup. * * Only one program is allowed to be attached to a cgroup with * NONE or BPF_F_ALLOW_OVERRIDE flag. * Attaching another program on top of NONE or BPF_F_ALLOW_OVERRIDE will * release old program and attach the new one. Attach flags has to match. * * Multiple programs are allowed to be attached to a cgroup with * BPF_F_ALLOW_MULTI flag. They are executed in FIFO order * (those that were attached first, run first) * The programs of sub-cgroup are executed first, then programs of * this cgroup and then programs of parent cgroup. * When children program makes decision (like picking TCP CA or sock bind) * parent program has a chance to override it. * * A cgroup with MULTI or OVERRIDE flag allows any attach flags in sub-cgroups. * A cgroup with NONE doesn't allow any programs in sub-cgroups. * Ex1: * cgrp1 (MULTI progs A, B) -> * cgrp2 (OVERRIDE prog C) -> * cgrp3 (MULTI prog D) -> * cgrp4 (OVERRIDE prog E) -> * cgrp5 (NONE prog F) * the event in cgrp5 triggers execution of F,D,A,B in that order. * if prog F is detached, the execution is E,D,A,B * if prog F and D are detached, the execution is E,A,B * if prog F, E and D are detached, the execution is C,A,B * * All eligible programs are executed regardless of return code from * earlier programs. */#define BPF_F_ALLOW_OVERRIDE (1U << 0)#define BPF_F_ALLOW_MULTI (1U << 1) /* If BPF_F_STRICT_ALIGNMENT is used in BPF_PROG_LOAD command, the * verifier will perform strict alignment checking as if the kernel * has been built with CONFIG_EFFICIENT_UNALIGNED_ACCESS not set, * and NET_IP_ALIGN defined to 2. */#define BPF_F_STRICT_ALIGNMENT (1U << 0) /* when bpf_ldimm64->src_reg == BPF_PSEUDO_MAP_FD, bpf_ldimm64->imm == fd */#define BPF_PSEUDO_MAP_FD 1 /* when bpf_call->src_reg == BPF_PSEUDO_CALL, bpf_call->imm == pc-relative * offset to another bpf function */#define BPF_PSEUDO_CALL 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 */ /* flags for BPF_MAP_CREATE command */#define BPF_F_NO_PREALLOC (1U << 0)/* Instead of having one common LRU list in the * BPF_MAP_TYPE_LRU_[PERCPU_]HASH map, use a percpu LRU list * which can scale and perform better. * Note, the LRU nodes (including free nodes) cannot be moved * across different LRU lists. */#define BPF_F_NO_COMMON_LRU (1U << 1)/* Specify numa node during map creation */#define BPF_F_NUMA_NODE (1U << 2) /* flags for BPF_PROG_QUERY */#define BPF_F_QUERY_EFFECTIVE (1U << 0) #define BPF_OBJ_NAME_LEN 16U /* Flags for accessing BPF object */#define BPF_F_RDONLY (1U << 3)#define BPF_F_WRONLY (1U << 4) /* Flag for stack_map, store build_id+offset instead of pointer */#define BPF_F_STACK_BUILD_ID (1U << 5) enum bpf_stack_build_id_status { /* user space need an empty entry to identify end of a trace */ BPF_STACK_BUILD_ID_EMPTY = 0, /* with valid build_id and offset */ BPF_STACK_BUILD_ID_VALID = 1, /* couldn't get build_id, fallback to ip */ BPF_STACK_BUILD_ID_IP = 2,}; #define BPF_BUILD_ID_SIZE 20struct bpf_stack_build_id { __s32 status; unsigned char build_id[BPF_BUILD_ID_SIZE]; union { __u64 offset; __u64 ip; };}; 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 */ __u32 map_flags; /* BPF_MAP_CREATE related * flags defined above. */ __u32 inner_map_fd; /* fd pointing to the inner map */ __u32 numa_node; /* numa node (effective only if * BPF_F_NUMA_NODE is set). */ char map_name[BPF_OBJ_NAME_LEN]; __u32 map_ifindex; /* ifindex of netdev to create on */ }; 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 */ __u32 prog_flags; char prog_name[BPF_OBJ_NAME_LEN]; __u32 prog_ifindex; /* ifindex of netdev to prep for */ /* For some prog types expected attach type must be known at * load time to verify attach type specific parts of prog * (context accesses, allowed helpers, etc). */ __u32 expected_attach_type; }; struct { /* anonymous struct used by BPF_OBJ_* commands */ __aligned_u64 pathname; __u32 bpf_fd; __u32 file_flags; }; struct { /* anonymous struct used by BPF_PROG_ATTACH/DETACH commands */ __u32 target_fd; /* container object to attach to */ __u32 attach_bpf_fd; /* eBPF program to attach */ __u32 attach_type; __u32 attach_flags; }; struct { /* anonymous struct used by BPF_PROG_TEST_RUN command */ __u32 prog_fd; __u32 retval; __u32 data_size_in; __u32 data_size_out; __aligned_u64 data_in; __aligned_u64 data_out; __u32 repeat; __u32 duration; } test; struct { /* anonymous struct used by BPF_*_GET_*_ID */ union { __u32 start_id; __u32 prog_id; __u32 map_id; }; __u32 next_id; __u32 open_flags; }; struct { /* anonymous struct used by BPF_OBJ_GET_INFO_BY_FD */ __u32 bpf_fd; __u32 info_len; __aligned_u64 info; } info; struct { /* anonymous struct used by BPF_PROG_QUERY command */ __u32 target_fd; /* container object to query */ __u32 attach_type; __u32 query_flags; __u32 attach_flags; __aligned_u64 prog_ids; __u32 prog_cnt; } query; struct { __u64 name; __u32 prog_fd; } raw_tracepoint;} __attribute__((aligned(8))); /* BPF helper function descriptions: * * void *bpf_map_lookup_elem(&map, &key) * Return: Map value or NULL * * int bpf_map_update_elem(&map, &key, &value, flags) * Return: 0 on success or negative error * * int bpf_map_delete_elem(&map, &key) * Return: 0 on success or negative error * * int bpf_probe_read(void *dst, int size, void *src) * Return: 0 on success or negative error * * u64 bpf_ktime_get_ns(void) * Return: current ktime * * int bpf_trace_printk(const char *fmt, int fmt_size, ...) * Return: length of buffer written or negative error * * u32 bpf_prandom_u32(void) * Return: random value * * u32 bpf_raw_smp_processor_id(void) * Return: SMP processor ID * * int bpf_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 or negative error * * int bpf_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 or negative error * * int bpf_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 or negative error * * int 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: 32-bit index inside array that selects specific program to run * Return: 0 on success or negative error * * int 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 or negative error * * u64 bpf_get_current_pid_tgid(void) * Return: current->tgid << 32 | current->pid * * u64 bpf_get_current_uid_gid(void) * Return: current_gid << 32 | current_uid * * int bpf_get_current_comm(char *buf, int size_of_buf) * stores current->comm into buf * Return: 0 on success or negative error * * u32 bpf_get_cgroup_classid(skb) * retrieve a proc's classid * @skb: pointer to skb * Return: classid if != 0 * * int bpf_skb_vlan_push(skb, vlan_proto, vlan_tci) * Return: 0 on success or negative error * * int bpf_skb_vlan_pop(skb) * Return: 0 on success or negative error * * int bpf_skb_get_tunnel_key(skb, key, size, flags) * int bpf_skb_set_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 * Return: 0 on success or negative error * * u64 bpf_perf_event_read(map, flags) * read perf event counter value * @map: pointer to perf_event_array map * @flags: index of event in the map or bitmask flags * Return: value of perf event counter read or error code * * int bpf_redirect(ifindex, flags) * redirect to another netdev * @ifindex: ifindex of the net device * @flags: * cls_bpf: * bit 0 - if set, redirect to ingress instead of egress * other bits - reserved * xdp_bpf: * all bits - reserved * Return: cls_bpf: TC_ACT_REDIRECT on success or TC_ACT_SHOT on error * xdp_bfp: XDP_REDIRECT on success or XDP_ABORT on error * int bpf_redirect_map(map, key, flags) * redirect to endpoint in map * @map: pointer to dev map * @key: index in map to lookup * @flags: -- * Return: XDP_REDIRECT on success or XDP_ABORT on error * * u32 bpf_get_route_realm(skb) * retrieve a dst's tclassid * @skb: pointer to skb * Return: realm if != 0 * * int bpf_perf_event_output(ctx, map, flags, data, size) * output perf raw sampleLines 1–500 of 1217. 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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ /* 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 (64-bit) */ #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 /* jmp encodings */ #define BPF_JNE 0x50 /* jump != */ #define BPF_JLT 0xa0 /* LT is unsigned, '<' */ #define BPF_JLE 0xb0 /* LE is unsigned, '<=' */ #define BPF_JSGT 0x60 /* SGT is signed '>', GT in x86 */ #define BPF_JSGE 0x70 /* SGE is signed '>=', GE in x86 */ #define BPF_JSLT 0xc0 /* SLT is signed, '<' */ #define BPF_JSLE 0xd0 /* SLE is signed, '<=' */ #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 */ }; /* Key of an a BPF_MAP_TYPE_LPM_TRIE entry */ struct bpf_lpm_trie_key { __u32 prefixlen; /* up to 32 for AF_INET, 128 for AF_INET6 */ __u8 data[0]; /* Arbitrary size */ }; /* 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, BPF_PROG_ATTACH, BPF_PROG_DETACH, BPF_PROG_TEST_RUN, BPF_PROG_GET_NEXT_ID, BPF_MAP_GET_NEXT_ID, BPF_PROG_GET_FD_BY_ID, BPF_MAP_GET_FD_BY_ID, BPF_OBJ_GET_INFO_BY_FD, BPF_PROG_QUERY, BPF_RAW_TRACEPOINT_OPEN, }; 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, BPF_MAP_TYPE_PERCPU_HASH, BPF_MAP_TYPE_PERCPU_ARRAY, BPF_MAP_TYPE_STACK_TRACE, BPF_MAP_TYPE_CGROUP_ARRAY, BPF_MAP_TYPE_LRU_HASH, BPF_MAP_TYPE_LRU_PERCPU_HASH, BPF_MAP_TYPE_LPM_TRIE, BPF_MAP_TYPE_ARRAY_OF_MAPS, BPF_MAP_TYPE_HASH_OF_MAPS, BPF_MAP_TYPE_DEVMAP, BPF_MAP_TYPE_SOCKMAP, BPF_MAP_TYPE_CPUMAP, }; 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, BPF_PROG_TYPE_TRACEPOINT, BPF_PROG_TYPE_XDP, BPF_PROG_TYPE_PERF_EVENT, BPF_PROG_TYPE_CGROUP_SKB, BPF_PROG_TYPE_CGROUP_SOCK, BPF_PROG_TYPE_LWT_IN, BPF_PROG_TYPE_LWT_OUT, BPF_PROG_TYPE_LWT_XMIT, BPF_PROG_TYPE_SOCK_OPS, BPF_PROG_TYPE_SK_SKB, BPF_PROG_TYPE_CGROUP_DEVICE, BPF_PROG_TYPE_SK_MSG, BPF_PROG_TYPE_RAW_TRACEPOINT, BPF_PROG_TYPE_CGROUP_SOCK_ADDR, }; enum bpf_attach_type { BPF_CGROUP_INET_INGRESS, BPF_CGROUP_INET_EGRESS, BPF_CGROUP_INET_SOCK_CREATE, BPF_CGROUP_SOCK_OPS, BPF_SK_SKB_STREAM_PARSER, BPF_SK_SKB_STREAM_VERDICT, BPF_CGROUP_DEVICE, BPF_SK_MSG_VERDICT, BPF_CGROUP_INET4_BIND, BPF_CGROUP_INET6_BIND, BPF_CGROUP_INET4_CONNECT, BPF_CGROUP_INET6_CONNECT, BPF_CGROUP_INET4_POST_BIND, BPF_CGROUP_INET6_POST_BIND, __MAX_BPF_ATTACH_TYPE }; #define MAX_BPF_ATTACH_TYPE __MAX_BPF_ATTACH_TYPE /* cgroup-bpf attach flags used in BPF_PROG_ATTACH command * * NONE(default): No further bpf programs allowed in the subtree. * * BPF_F_ALLOW_OVERRIDE: If a sub-cgroup installs some bpf program, * the program in this cgroup yields to sub-cgroup program. * * BPF_F_ALLOW_MULTI: If a sub-cgroup installs some bpf program, * that cgroup program gets run in addition to the program in this cgroup. * * Only one program is allowed to be attached to a cgroup with * NONE or BPF_F_ALLOW_OVERRIDE flag. * Attaching another program on top of NONE or BPF_F_ALLOW_OVERRIDE will * release old program and attach the new one. Attach flags has to match. * * Multiple programs are allowed to be attached to a cgroup with * BPF_F_ALLOW_MULTI flag. They are executed in FIFO order * (those that were attached first, run first) * The programs of sub-cgroup are executed first, then programs of * this cgroup and then programs of parent cgroup. * When children program makes decision (like picking TCP CA or sock bind) * parent program has a chance to override it. * * A cgroup with MULTI or OVERRIDE flag allows any attach flags in sub-cgroups. * A cgroup with NONE doesn't allow any programs in sub-cgroups. * Ex1: * cgrp1 (MULTI progs A, B) -> * cgrp2 (OVERRIDE prog C) -> * cgrp3 (MULTI prog D) -> * cgrp4 (OVERRIDE prog E) -> * cgrp5 (NONE prog F) * the event in cgrp5 triggers execution of F,D,A,B in that order. * if prog F is detached, the execution is E,D,A,B * if prog F and D are detached, the execution is E,A,B * if prog F, E and D are detached, the execution is C,A,B * * All eligible programs are executed regardless of return code from * earlier programs. */ #define BPF_F_ALLOW_OVERRIDE (1U << 0) #define BPF_F_ALLOW_MULTI (1U << 1) /* If BPF_F_STRICT_ALIGNMENT is used in BPF_PROG_LOAD command, the * verifier will perform strict alignment checking as if the kernel * has been built with CONFIG_EFFICIENT_UNALIGNED_ACCESS not set, * and NET_IP_ALIGN defined to 2. */ #define BPF_F_STRICT_ALIGNMENT (1U << 0) /* when bpf_ldimm64->src_reg == BPF_PSEUDO_MAP_FD, bpf_ldimm64->imm == fd */ #define BPF_PSEUDO_MAP_FD 1 /* when bpf_call->src_reg == BPF_PSEUDO_CALL, bpf_call->imm == pc-relative * offset to another bpf function */ #define BPF_PSEUDO_CALL 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 */ /* flags for BPF_MAP_CREATE command */ #define BPF_F_NO_PREALLOC (1U << 0) /* Instead of having one common LRU list in the * BPF_MAP_TYPE_LRU_[PERCPU_]HASH map, use a percpu LRU list * which can scale and perform better. * Note, the LRU nodes (including free nodes) cannot be moved * across different LRU lists. */ #define BPF_F_NO_COMMON_LRU (1U << 1) /* Specify numa node during map creation */ #define BPF_F_NUMA_NODE (1U << 2) /* flags for BPF_PROG_QUERY */ #define BPF_F_QUERY_EFFECTIVE (1U << 0) #define BPF_OBJ_NAME_LEN 16U /* Flags for accessing BPF object */ #define BPF_F_RDONLY (1U << 3) #define BPF_F_WRONLY (1U << 4) /* Flag for stack_map, store build_id+offset instead of pointer */ #define BPF_F_STACK_BUILD_ID (1U << 5) enum bpf_stack_build_id_status { /* user space need an empty entry to identify end of a trace */ BPF_STACK_BUILD_ID_EMPTY = 0, /* with valid build_id and offset */ BPF_STACK_BUILD_ID_VALID = 1, /* couldn't get build_id, fallback to ip */ BPF_STACK_BUILD_ID_IP = 2, }; #define BPF_BUILD_ID_SIZE 20 struct bpf_stack_build_id { __s32 status; unsigned char build_id[BPF_BUILD_ID_SIZE]; union { __u64 offset; __u64 ip; }; }; 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 */ __u32 map_flags; /* BPF_MAP_CREATE related * flags defined above. */ __u32 inner_map_fd; /* fd pointing to the inner map */ __u32 numa_node; /* numa node (effective only if * BPF_F_NUMA_NODE is set). */ char map_name[BPF_OBJ_NAME_LEN]; __u32 map_ifindex; /* ifindex of netdev to create on */ }; 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 */ __u32 prog_flags; char prog_name[BPF_OBJ_NAME_LEN]; __u32 prog_ifindex; /* ifindex of netdev to prep for */ /* For some prog types expected attach type must be known at * load time to verify attach type specific parts of prog * (context accesses, allowed helpers, etc). */ __u32 expected_attach_type; }; struct { /* anonymous struct used by BPF_OBJ_* commands */ __aligned_u64 pathname; __u32 bpf_fd; __u32 file_flags; }; struct { /* anonymous struct used by BPF_PROG_ATTACH/DETACH commands */ __u32 target_fd; /* container object to attach to */ __u32 attach_bpf_fd; /* eBPF program to attach */ __u32 attach_type; __u32 attach_flags; }; struct { /* anonymous struct used by BPF_PROG_TEST_RUN command */ __u32 prog_fd; __u32 retval; __u32 data_size_in; __u32 data_size_out; __aligned_u64 data_in; __aligned_u64 data_out; __u32 repeat; __u32 duration; } test; struct { /* anonymous struct used by BPF_*_GET_*_ID */ union { __u32 start_id; __u32 prog_id; __u32 map_id; }; __u32 next_id; __u32 open_flags; }; struct { /* anonymous struct used by BPF_OBJ_GET_INFO_BY_FD */ __u32 bpf_fd; __u32 info_len; __aligned_u64 info; } info; struct { /* anonymous struct used by BPF_PROG_QUERY command */ __u32 target_fd; /* container object to query */ __u32 attach_type; __u32 query_flags; __u32 attach_flags; __aligned_u64 prog_ids; __u32 prog_cnt; } query; struct { __u64 name; __u32 prog_fd; } raw_tracepoint; } __attribute__((aligned(8))); /* BPF helper function descriptions: * * void *bpf_map_lookup_elem(&map, &key) * Return: Map value or NULL * * int bpf_map_update_elem(&map, &key, &value, flags) * Return: 0 on success or negative error * * int bpf_map_delete_elem(&map, &key) * Return: 0 on success or negative error * * int bpf_probe_read(void *dst, int size, void *src) * Return: 0 on success or negative error * * u64 bpf_ktime_get_ns(void) * Return: current ktime * * int bpf_trace_printk(const char *fmt, int fmt_size, ...) * Return: length of buffer written or negative error * * u32 bpf_prandom_u32(void) * Return: random value * * u32 bpf_raw_smp_processor_id(void) * Return: SMP processor ID * * int bpf_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 or negative error * * int bpf_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 or negative error * * int bpf_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 or negative error * * int 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: 32-bit index inside array that selects specific program to run * Return: 0 on success or negative error * * int 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 or negative error * * u64 bpf_get_current_pid_tgid(void) * Return: current->tgid << 32 | current->pid * * u64 bpf_get_current_uid_gid(void) * Return: current_gid << 32 | current_uid * * int bpf_get_current_comm(char *buf, int size_of_buf) * stores current->comm into buf * Return: 0 on success or negative error * * u32 bpf_get_cgroup_classid(skb) * retrieve a proc's classid * @skb: pointer to skb * Return: classid if != 0 * * int bpf_skb_vlan_push(skb, vlan_proto, vlan_tci) * Return: 0 on success or negative error * * int bpf_skb_vlan_pop(skb) * Return: 0 on success or negative error * * int bpf_skb_get_tunnel_key(skb, key, size, flags) * int bpf_skb_set_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 * Return: 0 on success or negative error * * u64 bpf_perf_event_read(map, flags) * read perf event counter value * @map: pointer to perf_event_array map * @flags: index of event in the map or bitmask flags * Return: value of perf event counter read or error code * * int bpf_redirect(ifindex, flags) * redirect to another netdev * @ifindex: ifindex of the net device * @flags: * cls_bpf: * bit 0 - if set, redirect to ingress instead of egress * other bits - reserved * xdp_bpf: * all bits - reserved * Return: cls_bpf: TC_ACT_REDIRECT on success or TC_ACT_SHOT on error * xdp_bfp: XDP_REDIRECT on success or XDP_ABORT on error * int bpf_redirect_map(map, key, flags) * redirect to endpoint in map * @map: pointer to dev map * @key: index in map to lookup * @flags: -- * Return: XDP_REDIRECT on success or XDP_ABORT on error * * u32 bpf_get_route_realm(skb) * retrieve a dst's tclassid * @skb: pointer to skb * Return: realm if != 0 * * int bpf_perf_event_output(ctx, map, flags, data, size) * output perf raw sample