Message ID | 20180619132200.12320-2-sameeh@daynix.com |
---|---|
State | New |
Headers | show |
Series | Add BPF suuport to Qemu | expand |
On Tue, Jun 19, 2018 at 04:22:00PM +0300, Sameeh Jubran wrote: > From: Sameeh Jubran <sjubran@redhat.com> > > This commit introduces wrappers around BPF syscalls to qemu. The Berkeley > Packet Filter (BPF) can be really usefull for packet filtering, tracing and > monitoring with very minimal overhead. > > Signed-off-by: Sameeh Jubran <sjubran@redhat.com> > --- > MAINTAINERS | 7 + > bpf/Makefile.objs | 1 + > bpf/bpf_syscall.c | 98 ++++++ > include/bpf/bpf_syscall.h | 35 +++ > linux-headers/linux/bpf.h | 673 ++++++++++++++++++++++++++++++++++++++++ > scripts/update-linux-headers.sh | 3 +- > 6 files changed, 816 insertions(+), 1 deletion(-) > create mode 100644 bpf/Makefile.objs > create mode 100644 bpf/bpf_syscall.c > create mode 100644 include/bpf/bpf_syscall.h > create mode 100644 linux-headers/linux/bpf.h > > diff --git a/MAINTAINERS b/MAINTAINERS > index 0fb5f38f9f..ce3cd39121 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -2126,6 +2126,13 @@ F: hw/rdma/* > F: hw/rdma/vmw/* > F: docs/pvrdma.txt > > + > +BPF > +M: Sameeh Jubran <sameeh@daynix.com> > +S: Maintained > +F: bpf/* > +F: include/bpf* > + > Build and test automation > ------------------------- > Build and test automation > diff --git a/bpf/Makefile.objs b/bpf/Makefile.objs > new file mode 100644 > index 0000000000..fc38d9b5c9 > --- /dev/null > +++ b/bpf/Makefile.objs > @@ -0,0 +1 @@ > +common-obj-y += bpf_syscall.o Why do we need to have this enabled by default? IMO, this should be configurable. For example, adding a new --enable-bpf to the ./configure script and accessing it via $(CONFIG_BPF) variable in Makefiles. Or something among these lines. > diff --git a/bpf/bpf_syscall.c b/bpf/bpf_syscall.c > new file mode 100644 > index 0000000000..efdcd57ae8 > --- /dev/null > +++ b/bpf/bpf_syscall.c > @@ -0,0 +1,98 @@ > +/* > + * BPF syscalls > + * > + * Based on bpf-syscall.c from iovisor/ply > + * > + * Authors: > + * Sameeh Jubran <sameeh@daynix.com> > + * > + * This work is licensed under the terms of the GNU GPL, version 2. See > + * the COPYING file in the top-level directory. > + * > + */ > + > +#include <string.h> > +#include <unistd.h> > +#include <linux/bpf.h> > +#include <linux/version.h> > +#include <sys/syscall.h> > + > +#include "bpf/bpf_syscall.h" > + > +static __u64 ptr_to_u64(const void *ptr) > +{ > + return (__u64) (unsigned long) ptr; > +} > + > +int bpf_prog_load(enum bpf_prog_type type, const struct bpf_insn *insns, > + int insn_cnt, const char *license, unsigned kern_version, > + int log_level, char *bpf_log_buf, unsigned log_buf_size) > +{ > + union bpf_attr attr; > + > + /* required since the kernel checks that unused fields and pad > + * bytes are zeroed */ > + memset(&attr, 0, sizeof(attr)); > + > + attr.kern_version = kern_version; > + attr.prog_type = type; > + attr.insns = ptr_to_u64(insns); > + attr.insn_cnt = insn_cnt; > + attr.license = ptr_to_u64(license); > + attr.log_buf = ptr_to_u64(bpf_log_buf); > + attr.log_size = log_buf_size; > + attr.log_level = log_level; > + > + return syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr)); > +} > + > +int bpf_map_create(enum bpf_map_type type, int key_size, int val_size, > + int entries) > +{ > + union bpf_attr attr; > + > + /* required since the kernel checks that unused fields and pad > + * bytes are zeroed */ > + memset(&attr, 0, sizeof(attr)); > + > + attr.map_type = type; > + attr.key_size = key_size; > + attr.value_size = val_size; > + attr.max_entries = entries; > + > + return syscall(__NR_bpf, BPF_MAP_CREATE, &attr, sizeof(attr)); > +} > + > + > +static int bpf_map_operation(enum bpf_cmd cmd, int fd, > + void *key, void *val_or_next, int flags) > +{ > + union bpf_attr attr = { > + .map_fd = fd, > + .key = ptr_to_u64(key), > + .value = ptr_to_u64(val_or_next), > + .flags = flags, > + }; > + > + return syscall(__NR_bpf, cmd, &attr, sizeof(attr)); > +} > + > +int bpf_map_lookup(int fd, void *key, void *val) > +{ > + return bpf_map_operation(BPF_MAP_LOOKUP_ELEM, fd, key, val, 0); > +} > + > +int bpf_map_update(int fd, void *key, void *val, int flags) > +{ > + return bpf_map_operation(BPF_MAP_UPDATE_ELEM, fd, key, val, flags); > +} > + > +int bpf_map_delete(int fd, void *key) > +{ > + return bpf_map_operation(BPF_MAP_DELETE_ELEM, fd, key, NULL, 0); > +} > + > +int bpf_map_next(int fd, void *key, void *next_key) > +{ > + return bpf_map_operation(BPF_MAP_GET_NEXT_KEY, fd, key, next_key, 0); > +} > diff --git a/include/bpf/bpf_syscall.h b/include/bpf/bpf_syscall.h > new file mode 100644 > index 0000000000..8d1f170343 > --- /dev/null > +++ b/include/bpf/bpf_syscall.h > @@ -0,0 +1,35 @@ > +/* > + * BPF syscalls > + * > + * Based on bpf-syscall.h from iovisor/ply > + * > + * Authors: > + * Sameeh Jubran <sameeh@daynix.com> > + * > + * This work is licensed under the terms of the GNU GPL, version 2. See > + * the COPYING file in the top-level directory. > + * > + */ > + > +#ifndef BPF_SYSCALL_H > +#define BPF_SYSCALL_H > + > +#include <unistd.h> > + > +#include <linux/bpf.h> > +#include <linux/perf_event.h> > +#include <linux/version.h> > + > +int bpf_prog_load(enum bpf_prog_type type, const struct bpf_insn *insns, > + int insn_cnt, const char *license, unsigned kern_version, > + int log_level, char *bpf_log_buf, unsigned log_buf_size); > + > +int bpf_map_create(enum bpf_map_type type, int key_size, int val_size, > + int entries); > + > +int bpf_map_lookup(int fd, void *key, void *val); > +int bpf_map_update(int fd, void *key, void *val, int flags); > +int bpf_map_delete(int fd, void *key); > +int bpf_map_next(int fd, void *key, void *next_key); > + > +#endif > diff --git a/linux-headers/linux/bpf.h b/linux-headers/linux/bpf.h > new file mode 100644 > index 0000000000..d322ca1519 > --- /dev/null > +++ b/linux-headers/linux/bpf.h > @@ -0,0 +1,673 @@ > +/* 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 __LINUX_BPF_H__ > +#define __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 */ > +}; > + > +/* 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, > +}; > + > +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, > +}; > + > +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, > +}; > + > +enum bpf_attach_type { > + BPF_CGROUP_INET_INGRESS, > + BPF_CGROUP_INET_EGRESS, > + BPF_CGROUP_INET_SOCK_CREATE, > + __MAX_BPF_ATTACH_TYPE > +}; > + > +#define MAX_BPF_ATTACH_TYPE __MAX_BPF_ATTACH_TYPE > + > +/* If BPF_F_ALLOW_OVERRIDE flag is used in BPF_PROG_ATTACH command > + * to the given target_fd cgroup the descendent cgroup will be able to > + * override effective bpf program that was inherited from this cgroup > + */ > +#define BPF_F_ALLOW_OVERRIDE (1U << 0) > + > +/* 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) > + > +#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 */ > + > +#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) > + > +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; /* prealloc or not */ > + __u32 inner_map_fd; /* fd pointing to the inner 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 */ > + __u32 prog_flags; > + }; > + > + struct { /* anonymous struct used by BPF_OBJ_* commands */ > + __aligned_u64 pathname; > + __u32 bpf_fd; > + }; > + > + 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; > +} __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: 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, index) > + * Return: Number events read or error code > + * > + * int 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 > + * > + * 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, 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 or negative error > + * > + * int bpf_get_stackid(ctx, map, flags) > + * walk user or kernel stack and return id > + * @ctx: struct pt_regs* > + * @map: pointer to stack_trace map > + * @flags: bits 0-7 - numer of stack frames to skip > + * bit 8 - collect user stack instead of kernel > + * bit 9 - compare stacks by hash only > + * bit 10 - if two different stacks hash into the same stackid > + * discard old > + * other bits - reserved > + * Return: >= 0 stackid on success or negative error > + * > + * s64 bpf_csum_diff(from, from_size, to, to_size, seed) > + * calculate csum diff > + * @from: raw from buffer > + * @from_size: length of from buffer > + * @to: raw to buffer > + * @to_size: length of to buffer > + * @seed: optional seed > + * Return: csum result or negative error code > + * > + * int bpf_skb_get_tunnel_opt(skb, opt, size) > + * retrieve tunnel options metadata > + * @skb: pointer to skb > + * @opt: pointer to raw tunnel option data > + * @size: size of @opt > + * Return: option size > + * > + * int bpf_skb_set_tunnel_opt(skb, opt, size) > + * populate tunnel options metadata > + * @skb: pointer to skb > + * @opt: pointer to raw tunnel option data > + * @size: size of @opt > + * Return: 0 on success or negative error > + * > + * int bpf_skb_change_proto(skb, proto, flags) > + * Change protocol of the skb. Currently supported is v4 -> v6, > + * v6 -> v4 transitions. The helper will also resize the skb. eBPF > + * program is expected to fill the new headers via skb_store_bytes > + * and lX_csum_replace. > + * @skb: pointer to skb > + * @proto: new skb->protocol type > + * @flags: reserved > + * Return: 0 on success or negative error > + * > + * int bpf_skb_change_type(skb, type) > + * Change packet type of skb. > + * @skb: pointer to skb > + * @type: new skb->pkt_type type > + * Return: 0 on success or negative error > + * > + * int bpf_skb_under_cgroup(skb, map, index) > + * Check cgroup2 membership of skb > + * @skb: pointer to skb > + * @map: pointer to bpf_map in BPF_MAP_TYPE_CGROUP_ARRAY type > + * @index: index of the cgroup in the bpf_map > + * Return: > + * == 0 skb failed the cgroup2 descendant test > + * == 1 skb succeeded the cgroup2 descendant test > + * < 0 error > + * > + * u32 bpf_get_hash_recalc(skb) > + * Retrieve and possibly recalculate skb->hash. > + * @skb: pointer to skb > + * Return: hash > + * > + * u64 bpf_get_current_task(void) > + * Returns current task_struct > + * Return: current > + * > + * int bpf_probe_write_user(void *dst, void *src, int len) > + * safely attempt to write to a location > + * @dst: destination address in userspace > + * @src: source address on stack > + * @len: number of bytes to copy > + * Return: 0 on success or negative error > + * > + * int bpf_current_task_under_cgroup(map, index) > + * Check cgroup2 membership of current task > + * @map: pointer to bpf_map in BPF_MAP_TYPE_CGROUP_ARRAY type > + * @index: index of the cgroup in the bpf_map > + * Return: > + * == 0 current failed the cgroup2 descendant test > + * == 1 current succeeded the cgroup2 descendant test > + * < 0 error > + * > + * int bpf_skb_change_tail(skb, len, flags) > + * The helper will resize the skb to the given new size, to be used f.e. > + * with control messages. > + * @skb: pointer to skb > + * @len: new skb length > + * @flags: reserved > + * Return: 0 on success or negative error > + * > + * int bpf_skb_pull_data(skb, len) > + * The helper will pull in non-linear data in case the skb is non-linear > + * and not all of len are part of the linear section. Only needed for > + * read/write with direct packet access. > + * @skb: pointer to skb > + * @len: len to make read/writeable > + * Return: 0 on success or negative error > + * > + * s64 bpf_csum_update(skb, csum) > + * Adds csum into skb->csum in case of CHECKSUM_COMPLETE. > + * @skb: pointer to skb > + * @csum: csum to add > + * Return: csum on success or negative error > + * > + * void bpf_set_hash_invalid(skb) > + * Invalidate current skb->hash. > + * @skb: pointer to skb > + * > + * int bpf_get_numa_node_id() > + * Return: Id of current NUMA node. > + * > + * int bpf_skb_change_head() > + * Grows headroom of skb and adjusts MAC header offset accordingly. > + * Will extends/reallocae as required automatically. > + * May change skb data pointer and will thus invalidate any check > + * performed for direct packet access. > + * @skb: pointer to skb > + * @len: length of header to be pushed in front > + * @flags: Flags (unused for now) > + * Return: 0 on success or negative error > + * > + * int bpf_xdp_adjust_head(xdp_md, delta) > + * Adjust the xdp_md.data by delta > + * @xdp_md: pointer to xdp_md > + * @delta: An positive/negative integer to be added to xdp_md.data > + * Return: 0 on success or negative on error > + * > + * int bpf_probe_read_str(void *dst, int size, const void *unsafe_ptr) > + * Copy a NUL terminated string from unsafe address. In case the string > + * length is smaller than size, the target is not padded with further NUL > + * bytes. In case the string length is larger than size, just count-1 > + * bytes are copied and the last byte is set to NUL. > + * @dst: destination address > + * @size: maximum number of bytes to copy, including the trailing NUL > + * @unsafe_ptr: unsafe address > + * Return: > + * > 0 length of the string including the trailing NUL on success > + * < 0 error > + * > + * u64 bpf_get_socket_cookie(skb) > + * Get the cookie for the socket stored inside sk_buff. > + * @skb: pointer to skb > + * Return: 8 Bytes non-decreasing number on success or 0 if the socket > + * field is missing inside sk_buff > + * > + * u32 bpf_get_socket_uid(skb) > + * Get the owner uid of the socket stored inside sk_buff. > + * @skb: pointer to skb > + * Return: uid of the socket owner on success or overflowuid if failed. > + */ > +#define __BPF_FUNC_MAPPER(FN) \ > + FN(unspec), \ > + FN(map_lookup_elem), \ > + FN(map_update_elem), \ > + FN(map_delete_elem), \ > + FN(probe_read), \ > + FN(ktime_get_ns), \ > + FN(trace_printk), \ > + FN(get_prandom_u32), \ > + FN(get_smp_processor_id), \ > + FN(skb_store_bytes), \ > + FN(l3_csum_replace), \ > + FN(l4_csum_replace), \ > + FN(tail_call), \ > + FN(clone_redirect), \ > + FN(get_current_pid_tgid), \ > + FN(get_current_uid_gid), \ > + FN(get_current_comm), \ > + FN(get_cgroup_classid), \ > + FN(skb_vlan_push), \ > + FN(skb_vlan_pop), \ > + FN(skb_get_tunnel_key), \ > + FN(skb_set_tunnel_key), \ > + FN(perf_event_read), \ > + FN(redirect), \ > + FN(get_route_realm), \ > + FN(perf_event_output), \ > + FN(skb_load_bytes), \ > + FN(get_stackid), \ > + FN(csum_diff), \ > + FN(skb_get_tunnel_opt), \ > + FN(skb_set_tunnel_opt), \ > + FN(skb_change_proto), \ > + FN(skb_change_type), \ > + FN(skb_under_cgroup), \ > + FN(get_hash_recalc), \ > + FN(get_current_task), \ > + FN(probe_write_user), \ > + FN(current_task_under_cgroup), \ > + FN(skb_change_tail), \ > + FN(skb_pull_data), \ > + FN(csum_update), \ > + FN(set_hash_invalid), \ > + FN(get_numa_node_id), \ > + FN(skb_change_head), \ > + FN(xdp_adjust_head), \ > + FN(probe_read_str), \ > + FN(get_socket_cookie), \ > + FN(get_socket_uid), > + > +/* integer value in 'imm' field of BPF_CALL instruction selects which helper > + * function eBPF program intends to call > + */ > +#define __BPF_ENUM_FN(x) BPF_FUNC_ ## x > +enum bpf_func_id { > + __BPF_FUNC_MAPPER(__BPF_ENUM_FN) > + __BPF_FUNC_MAX_ID, > +}; > +#undef __BPF_ENUM_FN > + > +/* All flags used by eBPF helper functions, placed here. */ > + > +/* BPF_FUNC_skb_store_bytes flags. */ > +#define BPF_F_RECOMPUTE_CSUM (1ULL << 0) > +#define BPF_F_INVALIDATE_HASH (1ULL << 1) > + > +/* BPF_FUNC_l3_csum_replace and BPF_FUNC_l4_csum_replace flags. > + * First 4 bits are for passing the header field size. > + */ > +#define BPF_F_HDR_FIELD_MASK 0xfULL > + > +/* BPF_FUNC_l4_csum_replace flags. */ > +#define BPF_F_PSEUDO_HDR (1ULL << 4) > +#define BPF_F_MARK_MANGLED_0 (1ULL << 5) > +#define BPF_F_MARK_ENFORCE (1ULL << 6) > + > +/* BPF_FUNC_clone_redirect and BPF_FUNC_redirect flags. */ > +#define BPF_F_INGRESS (1ULL << 0) > + > +/* BPF_FUNC_skb_set_tunnel_key and BPF_FUNC_skb_get_tunnel_key flags. */ > +#define BPF_F_TUNINFO_IPV6 (1ULL << 0) > + > +/* BPF_FUNC_get_stackid flags. */ > +#define BPF_F_SKIP_FIELD_MASK 0xffULL > +#define BPF_F_USER_STACK (1ULL << 8) > +#define BPF_F_FAST_STACK_CMP (1ULL << 9) > +#define BPF_F_REUSE_STACKID (1ULL << 10) > + > +/* BPF_FUNC_skb_set_tunnel_key flags. */ > +#define BPF_F_ZERO_CSUM_TX (1ULL << 1) > +#define BPF_F_DONT_FRAGMENT (1ULL << 2) > + > +/* BPF_FUNC_perf_event_output and BPF_FUNC_perf_event_read flags. */ > +#define BPF_F_INDEX_MASK 0xffffffffULL > +#define BPF_F_CURRENT_CPU BPF_F_INDEX_MASK > +/* BPF_FUNC_perf_event_output for sk_buff input context. */ > +#define BPF_F_CTXLEN_MASK (0xfffffULL << 32) > + > +/* 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; > + __u32 data; > + __u32 data_end; > + __u32 napi_id; > +}; > + > +struct bpf_tunnel_key { > + __u32 tunnel_id; > + union { > + __u32 remote_ipv4; > + __u32 remote_ipv6[4]; > + }; > + __u8 tunnel_tos; > + __u8 tunnel_ttl; > + __u16 tunnel_ext; > + __u32 tunnel_label; > +}; > + > +/* Generic BPF return codes which all BPF program types may support. > + * The values are binary compatible with their TC_ACT_* counter-part to > + * provide backwards compatibility with existing SCHED_CLS and SCHED_ACT > + * programs. > + * > + * XDP is handled seprately, see XDP_*. > + */ > +enum bpf_ret_code { > + BPF_OK = 0, > + /* 1 reserved */ > + BPF_DROP = 2, > + /* 3-6 reserved */ > + BPF_REDIRECT = 7, > + /* >127 are reserved for prog type specific return codes */ > +}; > + > +struct bpf_sock { > + __u32 bound_dev_if; > + __u32 family; > + __u32 type; > + __u32 protocol; > +}; > + > +#define XDP_PACKET_HEADROOM 256 > + > +/* User return codes for XDP prog type. > + * A valid XDP program must return one of these defined values. All other > + * return codes are reserved for future use. Unknown return codes will result > + * in packet drop. > + */ > +enum xdp_action { > + XDP_ABORTED = 0, > + XDP_DROP, > + XDP_PASS, > + XDP_TX, > +}; > + > +/* user accessible metadata for XDP packet hook > + * new fields must be added to the end of this structure > + */ > +struct xdp_md { > + __u32 data; > + __u32 data_end; > +}; > + > +#endif /* __LINUX_BPF_H__ */ > diff --git a/scripts/update-linux-headers.sh b/scripts/update-linux-headers.sh > index feb75390aa..616855bb6e 100755 > --- a/scripts/update-linux-headers.sh > +++ b/scripts/update-linux-headers.sh > @@ -126,7 +126,8 @@ done > rm -rf "$output/linux-headers/linux" > mkdir -p "$output/linux-headers/linux" > for header in kvm.h vfio.h vfio_ccw.h vhost.h \ > - psci.h psp-sev.h userfaultfd.h; do > + psci.h psp-sev.h userfaultfd.h \ > + bpf.h; do > cp "$tmpdir/include/linux/$header" "$output/linux-headers/linux" > done > > -- > 2.13.6 > >
On Tue, Jun 19, 2018 at 5:41 PM, Murilo Opsfelder Araujo < muriloo@linux.ibm.com> wrote: > On Tue, Jun 19, 2018 at 04:22:00PM +0300, Sameeh Jubran wrote: > > From: Sameeh Jubran <sjubran@redhat.com> > > > > This commit introduces wrappers around BPF syscalls to qemu. The Berkeley > > Packet Filter (BPF) can be really usefull for packet filtering, tracing > and > > monitoring with very minimal overhead. > > > > Signed-off-by: Sameeh Jubran <sjubran@redhat.com> > > --- > > MAINTAINERS | 7 + > > bpf/Makefile.objs | 1 + > > bpf/bpf_syscall.c | 98 ++++++ > > include/bpf/bpf_syscall.h | 35 +++ > > linux-headers/linux/bpf.h | 673 ++++++++++++++++++++++++++++++ > ++++++++++ > > scripts/update-linux-headers.sh | 3 +- > > 6 files changed, 816 insertions(+), 1 deletion(-) > > create mode 100644 bpf/Makefile.objs > > create mode 100644 bpf/bpf_syscall.c > > create mode 100644 include/bpf/bpf_syscall.h > > create mode 100644 linux-headers/linux/bpf.h > > > > diff --git a/MAINTAINERS b/MAINTAINERS > > index 0fb5f38f9f..ce3cd39121 100644 > > --- a/MAINTAINERS > > +++ b/MAINTAINERS > > @@ -2126,6 +2126,13 @@ F: hw/rdma/* > > F: hw/rdma/vmw/* > > F: docs/pvrdma.txt > > > > + > > +BPF > > +M: Sameeh Jubran <sameeh@daynix.com> > > +S: Maintained > > +F: bpf/* > > +F: include/bpf* > > + > > Build and test automation > > ------------------------- > > Build and test automation > > diff --git a/bpf/Makefile.objs b/bpf/Makefile.objs > > new file mode 100644 > > index 0000000000..fc38d9b5c9 > > --- /dev/null > > +++ b/bpf/Makefile.objs > > @@ -0,0 +1 @@ > > +common-obj-y += bpf_syscall.o > > Why do we need to have this enabled by default? > > IMO, this should be configurable. For example, adding a new --enable-bpf > to the > ./configure script and accessing it via $(CONFIG_BPF) variable in > Makefiles. Or > something among these lines. I agree, I did this as an RFC only. I will change that when I'll send v1 :) Thanks! > > > diff --git a/bpf/bpf_syscall.c b/bpf/bpf_syscall.c > > new file mode 100644 > > index 0000000000..efdcd57ae8 > > --- /dev/null > > +++ b/bpf/bpf_syscall.c > > @@ -0,0 +1,98 @@ > > +/* > > + * BPF syscalls > > + * > > + * Based on bpf-syscall.c from iovisor/ply > > + * > > + * Authors: > > + * Sameeh Jubran <sameeh@daynix.com> > > + * > > + * This work is licensed under the terms of the GNU GPL, version 2. See > > + * the COPYING file in the top-level directory. > > + * > > + */ > > + > > +#include <string.h> > > +#include <unistd.h> > > +#include <linux/bpf.h> > > +#include <linux/version.h> > > +#include <sys/syscall.h> > > + > > +#include "bpf/bpf_syscall.h" > > + > > +static __u64 ptr_to_u64(const void *ptr) > > +{ > > + return (__u64) (unsigned long) ptr; > > +} > > + > > +int bpf_prog_load(enum bpf_prog_type type, const struct bpf_insn *insns, > > + int insn_cnt, const char *license, unsigned > kern_version, > > + int log_level, char *bpf_log_buf, unsigned log_buf_size) > > +{ > > + union bpf_attr attr; > > + > > + /* required since the kernel checks that unused fields and pad > > + * bytes are zeroed */ > > + memset(&attr, 0, sizeof(attr)); > > + > > + attr.kern_version = kern_version; > > + attr.prog_type = type; > > + attr.insns = ptr_to_u64(insns); > > + attr.insn_cnt = insn_cnt; > > + attr.license = ptr_to_u64(license); > > + attr.log_buf = ptr_to_u64(bpf_log_buf); > > + attr.log_size = log_buf_size; > > + attr.log_level = log_level; > > + > > + return syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr)); > > +} > > + > > +int bpf_map_create(enum bpf_map_type type, int key_size, int val_size, > > + int entries) > > +{ > > + union bpf_attr attr; > > + > > + /* required since the kernel checks that unused fields and pad > > + * bytes are zeroed */ > > + memset(&attr, 0, sizeof(attr)); > > + > > + attr.map_type = type; > > + attr.key_size = key_size; > > + attr.value_size = val_size; > > + attr.max_entries = entries; > > + > > + return syscall(__NR_bpf, BPF_MAP_CREATE, &attr, sizeof(attr)); > > +} > > + > > + > > +static int bpf_map_operation(enum bpf_cmd cmd, int fd, > > + void *key, void *val_or_next, int flags) > > +{ > > + union bpf_attr attr = { > > + .map_fd = fd, > > + .key = ptr_to_u64(key), > > + .value = ptr_to_u64(val_or_next), > > + .flags = flags, > > + }; > > + > > + return syscall(__NR_bpf, cmd, &attr, sizeof(attr)); > > +} > > + > > +int bpf_map_lookup(int fd, void *key, void *val) > > +{ > > + return bpf_map_operation(BPF_MAP_LOOKUP_ELEM, fd, key, val, 0); > > +} > > + > > +int bpf_map_update(int fd, void *key, void *val, int flags) > > +{ > > + return bpf_map_operation(BPF_MAP_UPDATE_ELEM, fd, key, val, flags); > > +} > > + > > +int bpf_map_delete(int fd, void *key) > > +{ > > + return bpf_map_operation(BPF_MAP_DELETE_ELEM, fd, key, NULL, 0); > > +} > > + > > +int bpf_map_next(int fd, void *key, void *next_key) > > +{ > > + return bpf_map_operation(BPF_MAP_GET_NEXT_KEY, fd, key, next_key, > 0); > > +} > > diff --git a/include/bpf/bpf_syscall.h b/include/bpf/bpf_syscall.h > > new file mode 100644 > > index 0000000000..8d1f170343 > > --- /dev/null > > +++ b/include/bpf/bpf_syscall.h > > @@ -0,0 +1,35 @@ > > +/* > > + * BPF syscalls > > + * > > + * Based on bpf-syscall.h from iovisor/ply > > + * > > + * Authors: > > + * Sameeh Jubran <sameeh@daynix.com> > > + * > > + * This work is licensed under the terms of the GNU GPL, version 2. See > > + * the COPYING file in the top-level directory. > > + * > > + */ > > + > > +#ifndef BPF_SYSCALL_H > > +#define BPF_SYSCALL_H > > + > > +#include <unistd.h> > > + > > +#include <linux/bpf.h> > > +#include <linux/perf_event.h> > > +#include <linux/version.h> > > + > > +int bpf_prog_load(enum bpf_prog_type type, const struct bpf_insn *insns, > > + int insn_cnt, const char *license, unsigned > kern_version, > > + int log_level, char *bpf_log_buf, unsigned > log_buf_size); > > + > > +int bpf_map_create(enum bpf_map_type type, int key_size, int val_size, > > + int entries); > > + > > +int bpf_map_lookup(int fd, void *key, void *val); > > +int bpf_map_update(int fd, void *key, void *val, int flags); > > +int bpf_map_delete(int fd, void *key); > > +int bpf_map_next(int fd, void *key, void *next_key); > > + > > +#endif > > diff --git a/linux-headers/linux/bpf.h b/linux-headers/linux/bpf.h > > new file mode 100644 > > index 0000000000..d322ca1519 > > --- /dev/null > > +++ b/linux-headers/linux/bpf.h > > @@ -0,0 +1,673 @@ > > +/* 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 __LINUX_BPF_H__ > > +#define __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 */ > > +}; > > + > > +/* 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, > > +}; > > + > > +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, > > +}; > > + > > +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, > > +}; > > + > > +enum bpf_attach_type { > > + BPF_CGROUP_INET_INGRESS, > > + BPF_CGROUP_INET_EGRESS, > > + BPF_CGROUP_INET_SOCK_CREATE, > > + __MAX_BPF_ATTACH_TYPE > > +}; > > + > > +#define MAX_BPF_ATTACH_TYPE __MAX_BPF_ATTACH_TYPE > > + > > +/* If BPF_F_ALLOW_OVERRIDE flag is used in BPF_PROG_ATTACH command > > + * to the given target_fd cgroup the descendent cgroup will be able to > > + * override effective bpf program that was inherited from this cgroup > > + */ > > +#define BPF_F_ALLOW_OVERRIDE (1U << 0) > > + > > +/* 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) > > + > > +#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 */ > > + > > +#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) > > + > > +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; /* prealloc or not */ > > + __u32 inner_map_fd; /* fd pointing to the inner 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 */ > > + __u32 prog_flags; > > + }; > > + > > + struct { /* anonymous struct used by BPF_OBJ_* commands */ > > + __aligned_u64 pathname; > > + __u32 bpf_fd; > > + }; > > + > > + 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; > > +} __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: 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, index) > > + * Return: Number events read or error code > > + * > > + * int 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 > > + * > > + * 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, 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 or negative error > > + * > > + * int bpf_get_stackid(ctx, map, flags) > > + * walk user or kernel stack and return id > > + * @ctx: struct pt_regs* > > + * @map: pointer to stack_trace map > > + * @flags: bits 0-7 - numer of stack frames to skip > > + * bit 8 - collect user stack instead of kernel > > + * bit 9 - compare stacks by hash only > > + * bit 10 - if two different stacks hash into the same > stackid > > + * discard old > > + * other bits - reserved > > + * Return: >= 0 stackid on success or negative error > > + * > > + * s64 bpf_csum_diff(from, from_size, to, to_size, seed) > > + * calculate csum diff > > + * @from: raw from buffer > > + * @from_size: length of from buffer > > + * @to: raw to buffer > > + * @to_size: length of to buffer > > + * @seed: optional seed > > + * Return: csum result or negative error code > > + * > > + * int bpf_skb_get_tunnel_opt(skb, opt, size) > > + * retrieve tunnel options metadata > > + * @skb: pointer to skb > > + * @opt: pointer to raw tunnel option data > > + * @size: size of @opt > > + * Return: option size > > + * > > + * int bpf_skb_set_tunnel_opt(skb, opt, size) > > + * populate tunnel options metadata > > + * @skb: pointer to skb > > + * @opt: pointer to raw tunnel option data > > + * @size: size of @opt > > + * Return: 0 on success or negative error > > + * > > + * int bpf_skb_change_proto(skb, proto, flags) > > + * Change protocol of the skb. Currently supported is v4 -> v6, > > + * v6 -> v4 transitions. The helper will also resize the skb. eBPF > > + * program is expected to fill the new headers via skb_store_bytes > > + * and lX_csum_replace. > > + * @skb: pointer to skb > > + * @proto: new skb->protocol type > > + * @flags: reserved > > + * Return: 0 on success or negative error > > + * > > + * int bpf_skb_change_type(skb, type) > > + * Change packet type of skb. > > + * @skb: pointer to skb > > + * @type: new skb->pkt_type type > > + * Return: 0 on success or negative error > > + * > > + * int bpf_skb_under_cgroup(skb, map, index) > > + * Check cgroup2 membership of skb > > + * @skb: pointer to skb > > + * @map: pointer to bpf_map in BPF_MAP_TYPE_CGROUP_ARRAY type > > + * @index: index of the cgroup in the bpf_map > > + * Return: > > + * == 0 skb failed the cgroup2 descendant test > > + * == 1 skb succeeded the cgroup2 descendant test > > + * < 0 error > > + * > > + * u32 bpf_get_hash_recalc(skb) > > + * Retrieve and possibly recalculate skb->hash. > > + * @skb: pointer to skb > > + * Return: hash > > + * > > + * u64 bpf_get_current_task(void) > > + * Returns current task_struct > > + * Return: current > > + * > > + * int bpf_probe_write_user(void *dst, void *src, int len) > > + * safely attempt to write to a location > > + * @dst: destination address in userspace > > + * @src: source address on stack > > + * @len: number of bytes to copy > > + * Return: 0 on success or negative error > > + * > > + * int bpf_current_task_under_cgroup(map, index) > > + * Check cgroup2 membership of current task > > + * @map: pointer to bpf_map in BPF_MAP_TYPE_CGROUP_ARRAY type > > + * @index: index of the cgroup in the bpf_map > > + * Return: > > + * == 0 current failed the cgroup2 descendant test > > + * == 1 current succeeded the cgroup2 descendant test > > + * < 0 error > > + * > > + * int bpf_skb_change_tail(skb, len, flags) > > + * The helper will resize the skb to the given new size, to be used > f.e. > > + * with control messages. > > + * @skb: pointer to skb > > + * @len: new skb length > > + * @flags: reserved > > + * Return: 0 on success or negative error > > + * > > + * int bpf_skb_pull_data(skb, len) > > + * The helper will pull in non-linear data in case the skb is > non-linear > > + * and not all of len are part of the linear section. Only needed > for > > + * read/write with direct packet access. > > + * @skb: pointer to skb > > + * @len: len to make read/writeable > > + * Return: 0 on success or negative error > > + * > > + * s64 bpf_csum_update(skb, csum) > > + * Adds csum into skb->csum in case of CHECKSUM_COMPLETE. > > + * @skb: pointer to skb > > + * @csum: csum to add > > + * Return: csum on success or negative error > > + * > > + * void bpf_set_hash_invalid(skb) > > + * Invalidate current skb->hash. > > + * @skb: pointer to skb > > + * > > + * int bpf_get_numa_node_id() > > + * Return: Id of current NUMA node. > > + * > > + * int bpf_skb_change_head() > > + * Grows headroom of skb and adjusts MAC header offset accordingly. > > + * Will extends/reallocae as required automatically. > > + * May change skb data pointer and will thus invalidate any check > > + * performed for direct packet access. > > + * @skb: pointer to skb > > + * @len: length of header to be pushed in front > > + * @flags: Flags (unused for now) > > + * Return: 0 on success or negative error > > + * > > + * int bpf_xdp_adjust_head(xdp_md, delta) > > + * Adjust the xdp_md.data by delta > > + * @xdp_md: pointer to xdp_md > > + * @delta: An positive/negative integer to be added to xdp_md.data > > + * Return: 0 on success or negative on error > > + * > > + * int bpf_probe_read_str(void *dst, int size, const void *unsafe_ptr) > > + * Copy a NUL terminated string from unsafe address. In case the > string > > + * length is smaller than size, the target is not padded with > further NUL > > + * bytes. In case the string length is larger than size, just > count-1 > > + * bytes are copied and the last byte is set to NUL. > > + * @dst: destination address > > + * @size: maximum number of bytes to copy, including the trailing > NUL > > + * @unsafe_ptr: unsafe address > > + * Return: > > + * > 0 length of the string including the trailing NUL on success > > + * < 0 error > > + * > > + * u64 bpf_get_socket_cookie(skb) > > + * Get the cookie for the socket stored inside sk_buff. > > + * @skb: pointer to skb > > + * Return: 8 Bytes non-decreasing number on success or 0 if the > socket > > + * field is missing inside sk_buff > > + * > > + * u32 bpf_get_socket_uid(skb) > > + * Get the owner uid of the socket stored inside sk_buff. > > + * @skb: pointer to skb > > + * Return: uid of the socket owner on success or overflowuid if > failed. > > + */ > > +#define __BPF_FUNC_MAPPER(FN) \ > > + FN(unspec), \ > > + FN(map_lookup_elem), \ > > + FN(map_update_elem), \ > > + FN(map_delete_elem), \ > > + FN(probe_read), \ > > + FN(ktime_get_ns), \ > > + FN(trace_printk), \ > > + FN(get_prandom_u32), \ > > + FN(get_smp_processor_id), \ > > + FN(skb_store_bytes), \ > > + FN(l3_csum_replace), \ > > + FN(l4_csum_replace), \ > > + FN(tail_call), \ > > + FN(clone_redirect), \ > > + FN(get_current_pid_tgid), \ > > + FN(get_current_uid_gid), \ > > + FN(get_current_comm), \ > > + FN(get_cgroup_classid), \ > > + FN(skb_vlan_push), \ > > + FN(skb_vlan_pop), \ > > + FN(skb_get_tunnel_key), \ > > + FN(skb_set_tunnel_key), \ > > + FN(perf_event_read), \ > > + FN(redirect), \ > > + FN(get_route_realm), \ > > + FN(perf_event_output), \ > > + FN(skb_load_bytes), \ > > + FN(get_stackid), \ > > + FN(csum_diff), \ > > + FN(skb_get_tunnel_opt), \ > > + FN(skb_set_tunnel_opt), \ > > + FN(skb_change_proto), \ > > + FN(skb_change_type), \ > > + FN(skb_under_cgroup), \ > > + FN(get_hash_recalc), \ > > + FN(get_current_task), \ > > + FN(probe_write_user), \ > > + FN(current_task_under_cgroup), \ > > + FN(skb_change_tail), \ > > + FN(skb_pull_data), \ > > + FN(csum_update), \ > > + FN(set_hash_invalid), \ > > + FN(get_numa_node_id), \ > > + FN(skb_change_head), \ > > + FN(xdp_adjust_head), \ > > + FN(probe_read_str), \ > > + FN(get_socket_cookie), \ > > + FN(get_socket_uid), > > + > > +/* integer value in 'imm' field of BPF_CALL instruction selects which > helper > > + * function eBPF program intends to call > > + */ > > +#define __BPF_ENUM_FN(x) BPF_FUNC_ ## x > > +enum bpf_func_id { > > + __BPF_FUNC_MAPPER(__BPF_ENUM_FN) > > + __BPF_FUNC_MAX_ID, > > +}; > > +#undef __BPF_ENUM_FN > > + > > +/* All flags used by eBPF helper functions, placed here. */ > > + > > +/* BPF_FUNC_skb_store_bytes flags. */ > > +#define BPF_F_RECOMPUTE_CSUM (1ULL << 0) > > +#define BPF_F_INVALIDATE_HASH (1ULL << 1) > > + > > +/* BPF_FUNC_l3_csum_replace and BPF_FUNC_l4_csum_replace flags. > > + * First 4 bits are for passing the header field size. > > + */ > > +#define BPF_F_HDR_FIELD_MASK 0xfULL > > + > > +/* BPF_FUNC_l4_csum_replace flags. */ > > +#define BPF_F_PSEUDO_HDR (1ULL << 4) > > +#define BPF_F_MARK_MANGLED_0 (1ULL << 5) > > +#define BPF_F_MARK_ENFORCE (1ULL << 6) > > + > > +/* BPF_FUNC_clone_redirect and BPF_FUNC_redirect flags. */ > > +#define BPF_F_INGRESS (1ULL << 0) > > + > > +/* BPF_FUNC_skb_set_tunnel_key and BPF_FUNC_skb_get_tunnel_key flags. */ > > +#define BPF_F_TUNINFO_IPV6 (1ULL << 0) > > + > > +/* BPF_FUNC_get_stackid flags. */ > > +#define BPF_F_SKIP_FIELD_MASK 0xffULL > > +#define BPF_F_USER_STACK (1ULL << 8) > > +#define BPF_F_FAST_STACK_CMP (1ULL << 9) > > +#define BPF_F_REUSE_STACKID (1ULL << 10) > > + > > +/* BPF_FUNC_skb_set_tunnel_key flags. */ > > +#define BPF_F_ZERO_CSUM_TX (1ULL << 1) > > +#define BPF_F_DONT_FRAGMENT (1ULL << 2) > > + > > +/* BPF_FUNC_perf_event_output and BPF_FUNC_perf_event_read flags. */ > > +#define BPF_F_INDEX_MASK 0xffffffffULL > > +#define BPF_F_CURRENT_CPU BPF_F_INDEX_MASK > > +/* BPF_FUNC_perf_event_output for sk_buff input context. */ > > +#define BPF_F_CTXLEN_MASK (0xfffffULL << 32) > > + > > +/* 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; > > + __u32 data; > > + __u32 data_end; > > + __u32 napi_id; > > +}; > > + > > +struct bpf_tunnel_key { > > + __u32 tunnel_id; > > + union { > > + __u32 remote_ipv4; > > + __u32 remote_ipv6[4]; > > + }; > > + __u8 tunnel_tos; > > + __u8 tunnel_ttl; > > + __u16 tunnel_ext; > > + __u32 tunnel_label; > > +}; > > + > > +/* Generic BPF return codes which all BPF program types may support. > > + * The values are binary compatible with their TC_ACT_* counter-part to > > + * provide backwards compatibility with existing SCHED_CLS and SCHED_ACT > > + * programs. > > + * > > + * XDP is handled seprately, see XDP_*. > > + */ > > +enum bpf_ret_code { > > + BPF_OK = 0, > > + /* 1 reserved */ > > + BPF_DROP = 2, > > + /* 3-6 reserved */ > > + BPF_REDIRECT = 7, > > + /* >127 are reserved for prog type specific return codes */ > > +}; > > + > > +struct bpf_sock { > > + __u32 bound_dev_if; > > + __u32 family; > > + __u32 type; > > + __u32 protocol; > > +}; > > + > > +#define XDP_PACKET_HEADROOM 256 > > + > > +/* User return codes for XDP prog type. > > + * A valid XDP program must return one of these defined values. All > other > > + * return codes are reserved for future use. Unknown return codes will > result > > + * in packet drop. > > + */ > > +enum xdp_action { > > + XDP_ABORTED = 0, > > + XDP_DROP, > > + XDP_PASS, > > + XDP_TX, > > +}; > > + > > +/* user accessible metadata for XDP packet hook > > + * new fields must be added to the end of this structure > > + */ > > +struct xdp_md { > > + __u32 data; > > + __u32 data_end; > > +}; > > + > > +#endif /* __LINUX_BPF_H__ */ > > diff --git a/scripts/update-linux-headers.sh b/scripts/update-linux- > headers.sh > > index feb75390aa..616855bb6e 100755 > > --- a/scripts/update-linux-headers.sh > > +++ b/scripts/update-linux-headers.sh > > @@ -126,7 +126,8 @@ done > > rm -rf "$output/linux-headers/linux" > > mkdir -p "$output/linux-headers/linux" > > for header in kvm.h vfio.h vfio_ccw.h vhost.h \ > > - psci.h psp-sev.h userfaultfd.h; do > > + psci.h psp-sev.h userfaultfd.h \ > > + bpf.h; do > > cp "$tmpdir/include/linux/$header" "$output/linux-headers/linux" > > done > > > > -- > > 2.13.6 > > > > > > -- > Murilo > >
diff --git a/MAINTAINERS b/MAINTAINERS index 0fb5f38f9f..ce3cd39121 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2126,6 +2126,13 @@ F: hw/rdma/* F: hw/rdma/vmw/* F: docs/pvrdma.txt + +BPF +M: Sameeh Jubran <sameeh@daynix.com> +S: Maintained +F: bpf/* +F: include/bpf* + Build and test automation ------------------------- Build and test automation diff --git a/bpf/Makefile.objs b/bpf/Makefile.objs new file mode 100644 index 0000000000..fc38d9b5c9 --- /dev/null +++ b/bpf/Makefile.objs @@ -0,0 +1 @@ +common-obj-y += bpf_syscall.o diff --git a/bpf/bpf_syscall.c b/bpf/bpf_syscall.c new file mode 100644 index 0000000000..efdcd57ae8 --- /dev/null +++ b/bpf/bpf_syscall.c @@ -0,0 +1,98 @@ +/* + * BPF syscalls + * + * Based on bpf-syscall.c from iovisor/ply + * + * Authors: + * Sameeh Jubran <sameeh@daynix.com> + * + * This work is licensed under the terms of the GNU GPL, version 2. See + * the COPYING file in the top-level directory. + * + */ + +#include <string.h> +#include <unistd.h> +#include <linux/bpf.h> +#include <linux/version.h> +#include <sys/syscall.h> + +#include "bpf/bpf_syscall.h" + +static __u64 ptr_to_u64(const void *ptr) +{ + return (__u64) (unsigned long) ptr; +} + +int bpf_prog_load(enum bpf_prog_type type, const struct bpf_insn *insns, + int insn_cnt, const char *license, unsigned kern_version, + int log_level, char *bpf_log_buf, unsigned log_buf_size) +{ + union bpf_attr attr; + + /* required since the kernel checks that unused fields and pad + * bytes are zeroed */ + memset(&attr, 0, sizeof(attr)); + + attr.kern_version = kern_version; + attr.prog_type = type; + attr.insns = ptr_to_u64(insns); + attr.insn_cnt = insn_cnt; + attr.license = ptr_to_u64(license); + attr.log_buf = ptr_to_u64(bpf_log_buf); + attr.log_size = log_buf_size; + attr.log_level = log_level; + + return syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr)); +} + +int bpf_map_create(enum bpf_map_type type, int key_size, int val_size, + int entries) +{ + union bpf_attr attr; + + /* required since the kernel checks that unused fields and pad + * bytes are zeroed */ + memset(&attr, 0, sizeof(attr)); + + attr.map_type = type; + attr.key_size = key_size; + attr.value_size = val_size; + attr.max_entries = entries; + + return syscall(__NR_bpf, BPF_MAP_CREATE, &attr, sizeof(attr)); +} + + +static int bpf_map_operation(enum bpf_cmd cmd, int fd, + void *key, void *val_or_next, int flags) +{ + union bpf_attr attr = { + .map_fd = fd, + .key = ptr_to_u64(key), + .value = ptr_to_u64(val_or_next), + .flags = flags, + }; + + return syscall(__NR_bpf, cmd, &attr, sizeof(attr)); +} + +int bpf_map_lookup(int fd, void *key, void *val) +{ + return bpf_map_operation(BPF_MAP_LOOKUP_ELEM, fd, key, val, 0); +} + +int bpf_map_update(int fd, void *key, void *val, int flags) +{ + return bpf_map_operation(BPF_MAP_UPDATE_ELEM, fd, key, val, flags); +} + +int bpf_map_delete(int fd, void *key) +{ + return bpf_map_operation(BPF_MAP_DELETE_ELEM, fd, key, NULL, 0); +} + +int bpf_map_next(int fd, void *key, void *next_key) +{ + return bpf_map_operation(BPF_MAP_GET_NEXT_KEY, fd, key, next_key, 0); +} diff --git a/include/bpf/bpf_syscall.h b/include/bpf/bpf_syscall.h new file mode 100644 index 0000000000..8d1f170343 --- /dev/null +++ b/include/bpf/bpf_syscall.h @@ -0,0 +1,35 @@ +/* + * BPF syscalls + * + * Based on bpf-syscall.h from iovisor/ply + * + * Authors: + * Sameeh Jubran <sameeh@daynix.com> + * + * This work is licensed under the terms of the GNU GPL, version 2. See + * the COPYING file in the top-level directory. + * + */ + +#ifndef BPF_SYSCALL_H +#define BPF_SYSCALL_H + +#include <unistd.h> + +#include <linux/bpf.h> +#include <linux/perf_event.h> +#include <linux/version.h> + +int bpf_prog_load(enum bpf_prog_type type, const struct bpf_insn *insns, + int insn_cnt, const char *license, unsigned kern_version, + int log_level, char *bpf_log_buf, unsigned log_buf_size); + +int bpf_map_create(enum bpf_map_type type, int key_size, int val_size, + int entries); + +int bpf_map_lookup(int fd, void *key, void *val); +int bpf_map_update(int fd, void *key, void *val, int flags); +int bpf_map_delete(int fd, void *key); +int bpf_map_next(int fd, void *key, void *next_key); + +#endif diff --git a/linux-headers/linux/bpf.h b/linux-headers/linux/bpf.h new file mode 100644 index 0000000000..d322ca1519 --- /dev/null +++ b/linux-headers/linux/bpf.h @@ -0,0 +1,673 @@ +/* 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 __LINUX_BPF_H__ +#define __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 */ +}; + +/* 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, +}; + +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, +}; + +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, +}; + +enum bpf_attach_type { + BPF_CGROUP_INET_INGRESS, + BPF_CGROUP_INET_EGRESS, + BPF_CGROUP_INET_SOCK_CREATE, + __MAX_BPF_ATTACH_TYPE +}; + +#define MAX_BPF_ATTACH_TYPE __MAX_BPF_ATTACH_TYPE + +/* If BPF_F_ALLOW_OVERRIDE flag is used in BPF_PROG_ATTACH command + * to the given target_fd cgroup the descendent cgroup will be able to + * override effective bpf program that was inherited from this cgroup + */ +#define BPF_F_ALLOW_OVERRIDE (1U << 0) + +/* 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) + +#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 */ + +#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) + +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; /* prealloc or not */ + __u32 inner_map_fd; /* fd pointing to the inner 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 */ + __u32 prog_flags; + }; + + struct { /* anonymous struct used by BPF_OBJ_* commands */ + __aligned_u64 pathname; + __u32 bpf_fd; + }; + + 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; +} __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: 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, index) + * Return: Number events read or error code + * + * int 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 + * + * 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, 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 or negative error + * + * int bpf_get_stackid(ctx, map, flags) + * walk user or kernel stack and return id + * @ctx: struct pt_regs* + * @map: pointer to stack_trace map + * @flags: bits 0-7 - numer of stack frames to skip + * bit 8 - collect user stack instead of kernel + * bit 9 - compare stacks by hash only + * bit 10 - if two different stacks hash into the same stackid + * discard old + * other bits - reserved + * Return: >= 0 stackid on success or negative error + * + * s64 bpf_csum_diff(from, from_size, to, to_size, seed) + * calculate csum diff + * @from: raw from buffer + * @from_size: length of from buffer + * @to: raw to buffer + * @to_size: length of to buffer + * @seed: optional seed + * Return: csum result or negative error code + * + * int bpf_skb_get_tunnel_opt(skb, opt, size) + * retrieve tunnel options metadata + * @skb: pointer to skb + * @opt: pointer to raw tunnel option data + * @size: size of @opt + * Return: option size + * + * int bpf_skb_set_tunnel_opt(skb, opt, size) + * populate tunnel options metadata + * @skb: pointer to skb + * @opt: pointer to raw tunnel option data + * @size: size of @opt + * Return: 0 on success or negative error + * + * int bpf_skb_change_proto(skb, proto, flags) + * Change protocol of the skb. Currently supported is v4 -> v6, + * v6 -> v4 transitions. The helper will also resize the skb. eBPF + * program is expected to fill the new headers via skb_store_bytes + * and lX_csum_replace. + * @skb: pointer to skb + * @proto: new skb->protocol type + * @flags: reserved + * Return: 0 on success or negative error + * + * int bpf_skb_change_type(skb, type) + * Change packet type of skb. + * @skb: pointer to skb + * @type: new skb->pkt_type type + * Return: 0 on success or negative error + * + * int bpf_skb_under_cgroup(skb, map, index) + * Check cgroup2 membership of skb + * @skb: pointer to skb + * @map: pointer to bpf_map in BPF_MAP_TYPE_CGROUP_ARRAY type + * @index: index of the cgroup in the bpf_map + * Return: + * == 0 skb failed the cgroup2 descendant test + * == 1 skb succeeded the cgroup2 descendant test + * < 0 error + * + * u32 bpf_get_hash_recalc(skb) + * Retrieve and possibly recalculate skb->hash. + * @skb: pointer to skb + * Return: hash + * + * u64 bpf_get_current_task(void) + * Returns current task_struct + * Return: current + * + * int bpf_probe_write_user(void *dst, void *src, int len) + * safely attempt to write to a location + * @dst: destination address in userspace + * @src: source address on stack + * @len: number of bytes to copy + * Return: 0 on success or negative error + * + * int bpf_current_task_under_cgroup(map, index) + * Check cgroup2 membership of current task + * @map: pointer to bpf_map in BPF_MAP_TYPE_CGROUP_ARRAY type + * @index: index of the cgroup in the bpf_map + * Return: + * == 0 current failed the cgroup2 descendant test + * == 1 current succeeded the cgroup2 descendant test + * < 0 error + * + * int bpf_skb_change_tail(skb, len, flags) + * The helper will resize the skb to the given new size, to be used f.e. + * with control messages. + * @skb: pointer to skb + * @len: new skb length + * @flags: reserved + * Return: 0 on success or negative error + * + * int bpf_skb_pull_data(skb, len) + * The helper will pull in non-linear data in case the skb is non-linear + * and not all of len are part of the linear section. Only needed for + * read/write with direct packet access. + * @skb: pointer to skb + * @len: len to make read/writeable + * Return: 0 on success or negative error + * + * s64 bpf_csum_update(skb, csum) + * Adds csum into skb->csum in case of CHECKSUM_COMPLETE. + * @skb: pointer to skb + * @csum: csum to add + * Return: csum on success or negative error + * + * void bpf_set_hash_invalid(skb) + * Invalidate current skb->hash. + * @skb: pointer to skb + * + * int bpf_get_numa_node_id() + * Return: Id of current NUMA node. + * + * int bpf_skb_change_head() + * Grows headroom of skb and adjusts MAC header offset accordingly. + * Will extends/reallocae as required automatically. + * May change skb data pointer and will thus invalidate any check + * performed for direct packet access. + * @skb: pointer to skb + * @len: length of header to be pushed in front + * @flags: Flags (unused for now) + * Return: 0 on success or negative error + * + * int bpf_xdp_adjust_head(xdp_md, delta) + * Adjust the xdp_md.data by delta + * @xdp_md: pointer to xdp_md + * @delta: An positive/negative integer to be added to xdp_md.data + * Return: 0 on success or negative on error + * + * int bpf_probe_read_str(void *dst, int size, const void *unsafe_ptr) + * Copy a NUL terminated string from unsafe address. In case the string + * length is smaller than size, the target is not padded with further NUL + * bytes. In case the string length is larger than size, just count-1 + * bytes are copied and the last byte is set to NUL. + * @dst: destination address + * @size: maximum number of bytes to copy, including the trailing NUL + * @unsafe_ptr: unsafe address + * Return: + * > 0 length of the string including the trailing NUL on success + * < 0 error + * + * u64 bpf_get_socket_cookie(skb) + * Get the cookie for the socket stored inside sk_buff. + * @skb: pointer to skb + * Return: 8 Bytes non-decreasing number on success or 0 if the socket + * field is missing inside sk_buff + * + * u32 bpf_get_socket_uid(skb) + * Get the owner uid of the socket stored inside sk_buff. + * @skb: pointer to skb + * Return: uid of the socket owner on success or overflowuid if failed. + */ +#define __BPF_FUNC_MAPPER(FN) \ + FN(unspec), \ + FN(map_lookup_elem), \ + FN(map_update_elem), \ + FN(map_delete_elem), \ + FN(probe_read), \ + FN(ktime_get_ns), \ + FN(trace_printk), \ + FN(get_prandom_u32), \ + FN(get_smp_processor_id), \ + FN(skb_store_bytes), \ + FN(l3_csum_replace), \ + FN(l4_csum_replace), \ + FN(tail_call), \ + FN(clone_redirect), \ + FN(get_current_pid_tgid), \ + FN(get_current_uid_gid), \ + FN(get_current_comm), \ + FN(get_cgroup_classid), \ + FN(skb_vlan_push), \ + FN(skb_vlan_pop), \ + FN(skb_get_tunnel_key), \ + FN(skb_set_tunnel_key), \ + FN(perf_event_read), \ + FN(redirect), \ + FN(get_route_realm), \ + FN(perf_event_output), \ + FN(skb_load_bytes), \ + FN(get_stackid), \ + FN(csum_diff), \ + FN(skb_get_tunnel_opt), \ + FN(skb_set_tunnel_opt), \ + FN(skb_change_proto), \ + FN(skb_change_type), \ + FN(skb_under_cgroup), \ + FN(get_hash_recalc), \ + FN(get_current_task), \ + FN(probe_write_user), \ + FN(current_task_under_cgroup), \ + FN(skb_change_tail), \ + FN(skb_pull_data), \ + FN(csum_update), \ + FN(set_hash_invalid), \ + FN(get_numa_node_id), \ + FN(skb_change_head), \ + FN(xdp_adjust_head), \ + FN(probe_read_str), \ + FN(get_socket_cookie), \ + FN(get_socket_uid), + +/* integer value in 'imm' field of BPF_CALL instruction selects which helper + * function eBPF program intends to call + */ +#define __BPF_ENUM_FN(x) BPF_FUNC_ ## x +enum bpf_func_id { + __BPF_FUNC_MAPPER(__BPF_ENUM_FN) + __BPF_FUNC_MAX_ID, +}; +#undef __BPF_ENUM_FN + +/* All flags used by eBPF helper functions, placed here. */ + +/* BPF_FUNC_skb_store_bytes flags. */ +#define BPF_F_RECOMPUTE_CSUM (1ULL << 0) +#define BPF_F_INVALIDATE_HASH (1ULL << 1) + +/* BPF_FUNC_l3_csum_replace and BPF_FUNC_l4_csum_replace flags. + * First 4 bits are for passing the header field size. + */ +#define BPF_F_HDR_FIELD_MASK 0xfULL + +/* BPF_FUNC_l4_csum_replace flags. */ +#define BPF_F_PSEUDO_HDR (1ULL << 4) +#define BPF_F_MARK_MANGLED_0 (1ULL << 5) +#define BPF_F_MARK_ENFORCE (1ULL << 6) + +/* BPF_FUNC_clone_redirect and BPF_FUNC_redirect flags. */ +#define BPF_F_INGRESS (1ULL << 0) + +/* BPF_FUNC_skb_set_tunnel_key and BPF_FUNC_skb_get_tunnel_key flags. */ +#define BPF_F_TUNINFO_IPV6 (1ULL << 0) + +/* BPF_FUNC_get_stackid flags. */ +#define BPF_F_SKIP_FIELD_MASK 0xffULL +#define BPF_F_USER_STACK (1ULL << 8) +#define BPF_F_FAST_STACK_CMP (1ULL << 9) +#define BPF_F_REUSE_STACKID (1ULL << 10) + +/* BPF_FUNC_skb_set_tunnel_key flags. */ +#define BPF_F_ZERO_CSUM_TX (1ULL << 1) +#define BPF_F_DONT_FRAGMENT (1ULL << 2) + +/* BPF_FUNC_perf_event_output and BPF_FUNC_perf_event_read flags. */ +#define BPF_F_INDEX_MASK 0xffffffffULL +#define BPF_F_CURRENT_CPU BPF_F_INDEX_MASK +/* BPF_FUNC_perf_event_output for sk_buff input context. */ +#define BPF_F_CTXLEN_MASK (0xfffffULL << 32) + +/* 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; + __u32 data; + __u32 data_end; + __u32 napi_id; +}; + +struct bpf_tunnel_key { + __u32 tunnel_id; + union { + __u32 remote_ipv4; + __u32 remote_ipv6[4]; + }; + __u8 tunnel_tos; + __u8 tunnel_ttl; + __u16 tunnel_ext; + __u32 tunnel_label; +}; + +/* Generic BPF return codes which all BPF program types may support. + * The values are binary compatible with their TC_ACT_* counter-part to + * provide backwards compatibility with existing SCHED_CLS and SCHED_ACT + * programs. + * + * XDP is handled seprately, see XDP_*. + */ +enum bpf_ret_code { + BPF_OK = 0, + /* 1 reserved */ + BPF_DROP = 2, + /* 3-6 reserved */ + BPF_REDIRECT = 7, + /* >127 are reserved for prog type specific return codes */ +}; + +struct bpf_sock { + __u32 bound_dev_if; + __u32 family; + __u32 type; + __u32 protocol; +}; + +#define XDP_PACKET_HEADROOM 256 + +/* User return codes for XDP prog type. + * A valid XDP program must return one of these defined values. All other + * return codes are reserved for future use. Unknown return codes will result + * in packet drop. + */ +enum xdp_action { + XDP_ABORTED = 0, + XDP_DROP, + XDP_PASS, + XDP_TX, +}; + +/* user accessible metadata for XDP packet hook + * new fields must be added to the end of this structure + */ +struct xdp_md { + __u32 data; + __u32 data_end; +}; + +#endif /* __LINUX_BPF_H__ */ diff --git a/scripts/update-linux-headers.sh b/scripts/update-linux-headers.sh index feb75390aa..616855bb6e 100755 --- a/scripts/update-linux-headers.sh +++ b/scripts/update-linux-headers.sh @@ -126,7 +126,8 @@ done rm -rf "$output/linux-headers/linux" mkdir -p "$output/linux-headers/linux" for header in kvm.h vfio.h vfio_ccw.h vhost.h \ - psci.h psp-sev.h userfaultfd.h; do + psci.h psp-sev.h userfaultfd.h \ + bpf.h; do cp "$tmpdir/include/linux/$header" "$output/linux-headers/linux" done