[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [RFC 1/1] Add BPF support to qemu
|
From: |
Sameeh Jubran |
|
Subject: |
[Qemu-devel] [RFC 1/1] Add BPF support to qemu |
|
Date: |
Tue, 19 Jun 2018 16:22:00 +0300 |
From: Sameeh Jubran <address@hidden>
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 <address@hidden>
---
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 <address@hidden>
+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 <address@hidden>
+ *
+ * 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 <address@hidden>
+ *
+ * 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