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authorLinus Torvalds <torvalds@linux-foundation.org>2020-10-16 04:42:13 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2020-10-16 04:42:13 +0300
commit9ff9b0d392ea08090cd1780fb196f36dbb586529 (patch)
tree276a3a5c4525b84dee64eda30b423fc31bf94850 /kernel/bpf/preload
parent840e5bb326bbcb16ce82dd2416d2769de4839aea (diff)
parent105faa8742437c28815b2a3eb8314ebc5fd9288c (diff)
downloadlinux-9ff9b0d392ea08090cd1780fb196f36dbb586529.tar.xz
Merge tag 'net-next-5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
Pull networking updates from Jakub Kicinski: - Add redirect_neigh() BPF packet redirect helper, allowing to limit stack traversal in common container configs and improving TCP back-pressure. Daniel reports ~10Gbps => ~15Gbps single stream TCP performance gain. - Expand netlink policy support and improve policy export to user space. (Ge)netlink core performs request validation according to declared policies. Expand the expressiveness of those policies (min/max length and bitmasks). Allow dumping policies for particular commands. This is used for feature discovery by user space (instead of kernel version parsing or trial and error). - Support IGMPv3/MLDv2 multicast listener discovery protocols in bridge. - Allow more than 255 IPv4 multicast interfaces. - Add support for Type of Service (ToS) reflection in SYN/SYN-ACK packets of TCPv6. - In Multi-patch TCP (MPTCP) support concurrent transmission of data on multiple subflows in a load balancing scenario. Enhance advertising addresses via the RM_ADDR/ADD_ADDR options. - Support SMC-Dv2 version of SMC, which enables multi-subnet deployments. - Allow more calls to same peer in RxRPC. - Support two new Controller Area Network (CAN) protocols - CAN-FD and ISO 15765-2:2016. - Add xfrm/IPsec compat layer, solving the 32bit user space on 64bit kernel problem. - Add TC actions for implementing MPLS L2 VPNs. - Improve nexthop code - e.g. handle various corner cases when nexthop objects are removed from groups better, skip unnecessary notifications and make it easier to offload nexthops into HW by converting to a blocking notifier. - Support adding and consuming TCP header options by BPF programs, opening the doors for easy experimental and deployment-specific TCP option use. - Reorganize TCP congestion control (CC) initialization to simplify life of TCP CC implemented in BPF. - Add support for shipping BPF programs with the kernel and loading them early on boot via the User Mode Driver mechanism, hence reusing all the user space infra we have. - Support sleepable BPF programs, initially targeting LSM and tracing. - Add bpf_d_path() helper for returning full path for given 'struct path'. - Make bpf_tail_call compatible with bpf-to-bpf calls. - Allow BPF programs to call map_update_elem on sockmaps. - Add BPF Type Format (BTF) support for type and enum discovery, as well as support for using BTF within the kernel itself (current use is for pretty printing structures). - Support listing and getting information about bpf_links via the bpf syscall. - Enhance kernel interfaces around NIC firmware update. Allow specifying overwrite mask to control if settings etc. are reset during update; report expected max time operation may take to users; support firmware activation without machine reboot incl. limits of how much impact reset may have (e.g. dropping link or not). - Extend ethtool configuration interface to report IEEE-standard counters, to limit the need for per-vendor logic in user space. - Adopt or extend devlink use for debug, monitoring, fw update in many drivers (dsa loop, ice, ionic, sja1105, qed, mlxsw, mv88e6xxx, dpaa2-eth). - In mlxsw expose critical and emergency SFP module temperature alarms. Refactor port buffer handling to make the defaults more suitable and support setting these values explicitly via the DCBNL interface. - Add XDP support for Intel's igb driver. - Support offloading TC flower classification and filtering rules to mscc_ocelot switches. - Add PTP support for Marvell Octeontx2 and PP2.2 hardware, as well as fixed interval period pulse generator and one-step timestamping in dpaa-eth. - Add support for various auth offloads in WiFi APs, e.g. SAE (WPA3) offload. - Add Lynx PHY/PCS MDIO module, and convert various drivers which have this HW to use it. Convert mvpp2 to split PCS. - Support Marvell Prestera 98DX3255 24-port switch ASICs, as well as 7-port Mediatek MT7531 IP. - Add initial support for QCA6390 and IPQ6018 in ath11k WiFi driver, and wcn3680 support in wcn36xx. - Improve performance for packets which don't require much offloads on recent Mellanox NICs by 20% by making multiple packets share a descriptor entry. - Move chelsio inline crypto drivers (for TLS and IPsec) from the crypto subtree to drivers/net. Move MDIO drivers out of the phy directory. - Clean up a lot of W=1 warnings, reportedly the actively developed subsections of networking drivers should now build W=1 warning free. - Make sure drivers don't use in_interrupt() to dynamically adapt their code. Convert tasklets to use new tasklet_setup API (sadly this conversion is not yet complete). * tag 'net-next-5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (2583 commits) Revert "bpfilter: Fix build error with CONFIG_BPFILTER_UMH" net, sockmap: Don't call bpf_prog_put() on NULL pointer bpf, selftest: Fix flaky tcp_hdr_options test when adding addr to lo bpf, sockmap: Add locking annotations to iterator netfilter: nftables: allow re-computing sctp CRC-32C in 'payload' statements net: fix pos incrementment in ipv6_route_seq_next net/smc: fix invalid return code in smcd_new_buf_create() net/smc: fix valid DMBE buffer sizes net/smc: fix use-after-free of delayed events bpfilter: Fix build error with CONFIG_BPFILTER_UMH cxgb4/ch_ipsec: Replace the module name to ch_ipsec from chcr net: sched: Fix suspicious RCU usage while accessing tcf_tunnel_info bpf: Fix register equivalence tracking. rxrpc: Fix loss of final ack on shutdown rxrpc: Fix bundle counting for exclusive connections netfilter: restore NF_INET_NUMHOOKS ibmveth: Identify ingress large send packets. ibmveth: Switch order of ibmveth_helper calls. cxgb4: handle 4-tuple PEDIT to NAT mode translation selftests: Add VRF route leaking tests ...
Diffstat (limited to 'kernel/bpf/preload')
-rw-r--r--kernel/bpf/preload/.gitignore4
-rw-r--r--kernel/bpf/preload/Kconfig26
-rw-r--r--kernel/bpf/preload/Makefile25
-rw-r--r--kernel/bpf/preload/bpf_preload.h16
-rw-r--r--kernel/bpf/preload/bpf_preload_kern.c91
-rw-r--r--kernel/bpf/preload/bpf_preload_umd_blob.S7
-rw-r--r--kernel/bpf/preload/iterators/.gitignore2
-rw-r--r--kernel/bpf/preload/iterators/Makefile57
-rw-r--r--kernel/bpf/preload/iterators/README4
-rw-r--r--kernel/bpf/preload/iterators/bpf_preload_common.h13
-rw-r--r--kernel/bpf/preload/iterators/iterators.bpf.c114
-rw-r--r--kernel/bpf/preload/iterators/iterators.c94
-rw-r--r--kernel/bpf/preload/iterators/iterators.skel.h412
13 files changed, 865 insertions, 0 deletions
diff --git a/kernel/bpf/preload/.gitignore b/kernel/bpf/preload/.gitignore
new file mode 100644
index 000000000000..856a4c5ad0dd
--- /dev/null
+++ b/kernel/bpf/preload/.gitignore
@@ -0,0 +1,4 @@
+/FEATURE-DUMP.libbpf
+/bpf_helper_defs.h
+/feature
+/bpf_preload_umd
diff --git a/kernel/bpf/preload/Kconfig b/kernel/bpf/preload/Kconfig
new file mode 100644
index 000000000000..ace49111d3a3
--- /dev/null
+++ b/kernel/bpf/preload/Kconfig
@@ -0,0 +1,26 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config USERMODE_DRIVER
+ bool
+ default n
+
+menuconfig BPF_PRELOAD
+ bool "Preload BPF file system with kernel specific program and map iterators"
+ depends on BPF
+ # The dependency on !COMPILE_TEST prevents it from being enabled
+ # in allmodconfig or allyesconfig configurations
+ depends on !COMPILE_TEST
+ select USERMODE_DRIVER
+ help
+ This builds kernel module with several embedded BPF programs that are
+ pinned into BPF FS mount point as human readable files that are
+ useful in debugging and introspection of BPF programs and maps.
+
+if BPF_PRELOAD
+config BPF_PRELOAD_UMD
+ tristate "bpf_preload kernel module with user mode driver"
+ depends on CC_CAN_LINK
+ depends on m || CC_CAN_LINK_STATIC
+ default m
+ help
+ This builds bpf_preload kernel module with embedded user mode driver.
+endif
diff --git a/kernel/bpf/preload/Makefile b/kernel/bpf/preload/Makefile
new file mode 100644
index 000000000000..23ee310b6eb4
--- /dev/null
+++ b/kernel/bpf/preload/Makefile
@@ -0,0 +1,25 @@
+# SPDX-License-Identifier: GPL-2.0
+
+LIBBPF_SRCS = $(srctree)/tools/lib/bpf/
+LIBBPF_A = $(obj)/libbpf.a
+LIBBPF_OUT = $(abspath $(obj))
+
+$(LIBBPF_A):
+ $(Q)$(MAKE) -C $(LIBBPF_SRCS) OUTPUT=$(LIBBPF_OUT)/ $(LIBBPF_OUT)/libbpf.a
+
+userccflags += -I $(srctree)/tools/include/ -I $(srctree)/tools/include/uapi \
+ -I $(srctree)/tools/lib/ -Wno-unused-result
+
+userprogs := bpf_preload_umd
+
+clean-files := $(userprogs) bpf_helper_defs.h FEATURE-DUMP.libbpf staticobjs/ feature/
+
+bpf_preload_umd-objs := iterators/iterators.o
+bpf_preload_umd-userldlibs := $(LIBBPF_A) -lelf -lz
+
+$(obj)/bpf_preload_umd: $(LIBBPF_A)
+
+$(obj)/bpf_preload_umd_blob.o: $(obj)/bpf_preload_umd
+
+obj-$(CONFIG_BPF_PRELOAD_UMD) += bpf_preload.o
+bpf_preload-objs += bpf_preload_kern.o bpf_preload_umd_blob.o
diff --git a/kernel/bpf/preload/bpf_preload.h b/kernel/bpf/preload/bpf_preload.h
new file mode 100644
index 000000000000..2f9932276f2e
--- /dev/null
+++ b/kernel/bpf/preload/bpf_preload.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _BPF_PRELOAD_H
+#define _BPF_PRELOAD_H
+
+#include <linux/usermode_driver.h>
+#include "iterators/bpf_preload_common.h"
+
+struct bpf_preload_ops {
+ struct umd_info info;
+ int (*preload)(struct bpf_preload_info *);
+ int (*finish)(void);
+ struct module *owner;
+};
+extern struct bpf_preload_ops *bpf_preload_ops;
+#define BPF_PRELOAD_LINKS 2
+#endif
diff --git a/kernel/bpf/preload/bpf_preload_kern.c b/kernel/bpf/preload/bpf_preload_kern.c
new file mode 100644
index 000000000000..79c5772465f1
--- /dev/null
+++ b/kernel/bpf/preload/bpf_preload_kern.c
@@ -0,0 +1,91 @@
+// SPDX-License-Identifier: GPL-2.0
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/pid.h>
+#include <linux/fs.h>
+#include <linux/sched/signal.h>
+#include "bpf_preload.h"
+
+extern char bpf_preload_umd_start;
+extern char bpf_preload_umd_end;
+
+static int preload(struct bpf_preload_info *obj);
+static int finish(void);
+
+static struct bpf_preload_ops umd_ops = {
+ .info.driver_name = "bpf_preload",
+ .preload = preload,
+ .finish = finish,
+ .owner = THIS_MODULE,
+};
+
+static int preload(struct bpf_preload_info *obj)
+{
+ int magic = BPF_PRELOAD_START;
+ loff_t pos = 0;
+ int i, err;
+ ssize_t n;
+
+ err = fork_usermode_driver(&umd_ops.info);
+ if (err)
+ return err;
+
+ /* send the start magic to let UMD proceed with loading BPF progs */
+ n = kernel_write(umd_ops.info.pipe_to_umh,
+ &magic, sizeof(magic), &pos);
+ if (n != sizeof(magic))
+ return -EPIPE;
+
+ /* receive bpf_link IDs and names from UMD */
+ pos = 0;
+ for (i = 0; i < BPF_PRELOAD_LINKS; i++) {
+ n = kernel_read(umd_ops.info.pipe_from_umh,
+ &obj[i], sizeof(*obj), &pos);
+ if (n != sizeof(*obj))
+ return -EPIPE;
+ }
+ return 0;
+}
+
+static int finish(void)
+{
+ int magic = BPF_PRELOAD_END;
+ struct pid *tgid;
+ loff_t pos = 0;
+ ssize_t n;
+
+ /* send the last magic to UMD. It will do a normal exit. */
+ n = kernel_write(umd_ops.info.pipe_to_umh,
+ &magic, sizeof(magic), &pos);
+ if (n != sizeof(magic))
+ return -EPIPE;
+ tgid = umd_ops.info.tgid;
+ wait_event(tgid->wait_pidfd, thread_group_exited(tgid));
+ umd_ops.info.tgid = NULL;
+ return 0;
+}
+
+static int __init load_umd(void)
+{
+ int err;
+
+ err = umd_load_blob(&umd_ops.info, &bpf_preload_umd_start,
+ &bpf_preload_umd_end - &bpf_preload_umd_start);
+ if (err)
+ return err;
+ bpf_preload_ops = &umd_ops;
+ return err;
+}
+
+static void __exit fini_umd(void)
+{
+ bpf_preload_ops = NULL;
+ /* kill UMD in case it's still there due to earlier error */
+ kill_pid(umd_ops.info.tgid, SIGKILL, 1);
+ umd_ops.info.tgid = NULL;
+ umd_unload_blob(&umd_ops.info);
+}
+late_initcall(load_umd);
+module_exit(fini_umd);
+MODULE_LICENSE("GPL");
diff --git a/kernel/bpf/preload/bpf_preload_umd_blob.S b/kernel/bpf/preload/bpf_preload_umd_blob.S
new file mode 100644
index 000000000000..f1f40223b5c3
--- /dev/null
+++ b/kernel/bpf/preload/bpf_preload_umd_blob.S
@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+ .section .init.rodata, "a"
+ .global bpf_preload_umd_start
+bpf_preload_umd_start:
+ .incbin "kernel/bpf/preload/bpf_preload_umd"
+ .global bpf_preload_umd_end
+bpf_preload_umd_end:
diff --git a/kernel/bpf/preload/iterators/.gitignore b/kernel/bpf/preload/iterators/.gitignore
new file mode 100644
index 000000000000..ffdb70230c8b
--- /dev/null
+++ b/kernel/bpf/preload/iterators/.gitignore
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+/.output
diff --git a/kernel/bpf/preload/iterators/Makefile b/kernel/bpf/preload/iterators/Makefile
new file mode 100644
index 000000000000..28fa8c1440f4
--- /dev/null
+++ b/kernel/bpf/preload/iterators/Makefile
@@ -0,0 +1,57 @@
+# SPDX-License-Identifier: GPL-2.0
+OUTPUT := .output
+CLANG ?= clang
+LLC ?= llc
+LLVM_STRIP ?= llvm-strip
+DEFAULT_BPFTOOL := $(OUTPUT)/sbin/bpftool
+BPFTOOL ?= $(DEFAULT_BPFTOOL)
+LIBBPF_SRC := $(abspath ../../../../tools/lib/bpf)
+BPFOBJ := $(OUTPUT)/libbpf.a
+BPF_INCLUDE := $(OUTPUT)
+INCLUDES := -I$(OUTPUT) -I$(BPF_INCLUDE) -I$(abspath ../../../../tools/lib) \
+ -I$(abspath ../../../../tools/include/uapi)
+CFLAGS := -g -Wall
+
+abs_out := $(abspath $(OUTPUT))
+ifeq ($(V),1)
+Q =
+msg =
+else
+Q = @
+msg = @printf ' %-8s %s%s\n' "$(1)" "$(notdir $(2))" "$(if $(3), $(3))";
+MAKEFLAGS += --no-print-directory
+submake_extras := feature_display=0
+endif
+
+.DELETE_ON_ERROR:
+
+.PHONY: all clean
+
+all: iterators.skel.h
+
+clean:
+ $(call msg,CLEAN)
+ $(Q)rm -rf $(OUTPUT) iterators
+
+iterators.skel.h: $(OUTPUT)/iterators.bpf.o | $(BPFTOOL)
+ $(call msg,GEN-SKEL,$@)
+ $(Q)$(BPFTOOL) gen skeleton $< > $@
+
+
+$(OUTPUT)/iterators.bpf.o: iterators.bpf.c $(BPFOBJ) | $(OUTPUT)
+ $(call msg,BPF,$@)
+ $(Q)$(CLANG) -g -O2 -target bpf $(INCLUDES) \
+ -c $(filter %.c,$^) -o $@ && \
+ $(LLVM_STRIP) -g $@
+
+$(OUTPUT):
+ $(call msg,MKDIR,$@)
+ $(Q)mkdir -p $(OUTPUT)
+
+$(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(OUTPUT)
+ $(Q)$(MAKE) $(submake_extras) -C $(LIBBPF_SRC) \
+ OUTPUT=$(abspath $(dir $@))/ $(abspath $@)
+
+$(DEFAULT_BPFTOOL):
+ $(Q)$(MAKE) $(submake_extras) -C ../../../../tools/bpf/bpftool \
+ prefix= OUTPUT=$(abs_out)/ DESTDIR=$(abs_out) install
diff --git a/kernel/bpf/preload/iterators/README b/kernel/bpf/preload/iterators/README
new file mode 100644
index 000000000000..7fd6d39a9ad2
--- /dev/null
+++ b/kernel/bpf/preload/iterators/README
@@ -0,0 +1,4 @@
+WARNING:
+If you change "iterators.bpf.c" do "make -j" in this directory to rebuild "iterators.skel.h".
+Make sure to have clang 10 installed.
+See Documentation/bpf/bpf_devel_QA.rst
diff --git a/kernel/bpf/preload/iterators/bpf_preload_common.h b/kernel/bpf/preload/iterators/bpf_preload_common.h
new file mode 100644
index 000000000000..8464d1a48c05
--- /dev/null
+++ b/kernel/bpf/preload/iterators/bpf_preload_common.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _BPF_PRELOAD_COMMON_H
+#define _BPF_PRELOAD_COMMON_H
+
+#define BPF_PRELOAD_START 0x5555
+#define BPF_PRELOAD_END 0xAAAA
+
+struct bpf_preload_info {
+ char link_name[16];
+ int link_id;
+};
+
+#endif
diff --git a/kernel/bpf/preload/iterators/iterators.bpf.c b/kernel/bpf/preload/iterators/iterators.bpf.c
new file mode 100644
index 000000000000..52aa7b38e8b8
--- /dev/null
+++ b/kernel/bpf/preload/iterators/iterators.bpf.c
@@ -0,0 +1,114 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2020 Facebook */
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+#include <bpf/bpf_core_read.h>
+
+#pragma clang attribute push (__attribute__((preserve_access_index)), apply_to = record)
+struct seq_file;
+struct bpf_iter_meta {
+ struct seq_file *seq;
+ __u64 session_id;
+ __u64 seq_num;
+};
+
+struct bpf_map {
+ __u32 id;
+ char name[16];
+ __u32 max_entries;
+};
+
+struct bpf_iter__bpf_map {
+ struct bpf_iter_meta *meta;
+ struct bpf_map *map;
+};
+
+struct btf_type {
+ __u32 name_off;
+};
+
+struct btf_header {
+ __u32 str_len;
+};
+
+struct btf {
+ const char *strings;
+ struct btf_type **types;
+ struct btf_header hdr;
+};
+
+struct bpf_prog_aux {
+ __u32 id;
+ char name[16];
+ const char *attach_func_name;
+ struct bpf_prog *dst_prog;
+ struct bpf_func_info *func_info;
+ struct btf *btf;
+};
+
+struct bpf_prog {
+ struct bpf_prog_aux *aux;
+};
+
+struct bpf_iter__bpf_prog {
+ struct bpf_iter_meta *meta;
+ struct bpf_prog *prog;
+};
+#pragma clang attribute pop
+
+static const char *get_name(struct btf *btf, long btf_id, const char *fallback)
+{
+ struct btf_type **types, *t;
+ unsigned int name_off;
+ const char *str;
+
+ if (!btf)
+ return fallback;
+ str = btf->strings;
+ types = btf->types;
+ bpf_probe_read_kernel(&t, sizeof(t), types + btf_id);
+ name_off = BPF_CORE_READ(t, name_off);
+ if (name_off >= btf->hdr.str_len)
+ return fallback;
+ return str + name_off;
+}
+
+SEC("iter/bpf_map")
+int dump_bpf_map(struct bpf_iter__bpf_map *ctx)
+{
+ struct seq_file *seq = ctx->meta->seq;
+ __u64 seq_num = ctx->meta->seq_num;
+ struct bpf_map *map = ctx->map;
+
+ if (!map)
+ return 0;
+
+ if (seq_num == 0)
+ BPF_SEQ_PRINTF(seq, " id name max_entries\n");
+
+ BPF_SEQ_PRINTF(seq, "%4u %-16s%6d\n", map->id, map->name, map->max_entries);
+ return 0;
+}
+
+SEC("iter/bpf_prog")
+int dump_bpf_prog(struct bpf_iter__bpf_prog *ctx)
+{
+ struct seq_file *seq = ctx->meta->seq;
+ __u64 seq_num = ctx->meta->seq_num;
+ struct bpf_prog *prog = ctx->prog;
+ struct bpf_prog_aux *aux;
+
+ if (!prog)
+ return 0;
+
+ aux = prog->aux;
+ if (seq_num == 0)
+ BPF_SEQ_PRINTF(seq, " id name attached\n");
+
+ BPF_SEQ_PRINTF(seq, "%4u %-16s %s %s\n", aux->id,
+ get_name(aux->btf, aux->func_info[0].type_id, aux->name),
+ aux->attach_func_name, aux->dst_prog->aux->name);
+ return 0;
+}
+char LICENSE[] SEC("license") = "GPL";
diff --git a/kernel/bpf/preload/iterators/iterators.c b/kernel/bpf/preload/iterators/iterators.c
new file mode 100644
index 000000000000..b7ff87939172
--- /dev/null
+++ b/kernel/bpf/preload/iterators/iterators.c
@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2020 Facebook */
+#include <argp.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/resource.h>
+#include <bpf/libbpf.h>
+#include <bpf/bpf.h>
+#include <sys/mount.h>
+#include "iterators.skel.h"
+#include "bpf_preload_common.h"
+
+int to_kernel = -1;
+int from_kernel = 0;
+
+static int send_link_to_kernel(struct bpf_link *link, const char *link_name)
+{
+ struct bpf_preload_info obj = {};
+ struct bpf_link_info info = {};
+ __u32 info_len = sizeof(info);
+ int err;
+
+ err = bpf_obj_get_info_by_fd(bpf_link__fd(link), &info, &info_len);
+ if (err)
+ return err;
+ obj.link_id = info.id;
+ if (strlen(link_name) >= sizeof(obj.link_name))
+ return -E2BIG;
+ strcpy(obj.link_name, link_name);
+ if (write(to_kernel, &obj, sizeof(obj)) != sizeof(obj))
+ return -EPIPE;
+ return 0;
+}
+
+int main(int argc, char **argv)
+{
+ struct rlimit rlim = { RLIM_INFINITY, RLIM_INFINITY };
+ struct iterators_bpf *skel;
+ int err, magic;
+ int debug_fd;
+
+ debug_fd = open("/dev/console", O_WRONLY | O_NOCTTY | O_CLOEXEC);
+ if (debug_fd < 0)
+ return 1;
+ to_kernel = dup(1);
+ close(1);
+ dup(debug_fd);
+ /* now stdin and stderr point to /dev/console */
+
+ read(from_kernel, &magic, sizeof(magic));
+ if (magic != BPF_PRELOAD_START) {
+ printf("bad start magic %d\n", magic);
+ return 1;
+ }
+ setrlimit(RLIMIT_MEMLOCK, &rlim);
+ /* libbpf opens BPF object and loads it into the kernel */
+ skel = iterators_bpf__open_and_load();
+ if (!skel) {
+ /* iterators.skel.h is little endian.
+ * libbpf doesn't support automatic little->big conversion
+ * of BPF bytecode yet.
+ * The program load will fail in such case.
+ */
+ printf("Failed load could be due to wrong endianness\n");
+ return 1;
+ }
+ err = iterators_bpf__attach(skel);
+ if (err)
+ goto cleanup;
+
+ /* send two bpf_link IDs with names to the kernel */
+ err = send_link_to_kernel(skel->links.dump_bpf_map, "maps.debug");
+ if (err)
+ goto cleanup;
+ err = send_link_to_kernel(skel->links.dump_bpf_prog, "progs.debug");
+ if (err)
+ goto cleanup;
+
+ /* The kernel will proceed with pinnging the links in bpffs.
+ * UMD will wait on read from pipe.
+ */
+ read(from_kernel, &magic, sizeof(magic));
+ if (magic != BPF_PRELOAD_END) {
+ printf("bad final magic %d\n", magic);
+ err = -EINVAL;
+ }
+cleanup:
+ iterators_bpf__destroy(skel);
+
+ return err != 0;
+}
diff --git a/kernel/bpf/preload/iterators/iterators.skel.h b/kernel/bpf/preload/iterators/iterators.skel.h
new file mode 100644
index 000000000000..cf9a6a94b3a4
--- /dev/null
+++ b/kernel/bpf/preload/iterators/iterators.skel.h
@@ -0,0 +1,412 @@
+/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
+
+/* THIS FILE IS AUTOGENERATED! */
+#ifndef __ITERATORS_BPF_SKEL_H__
+#define __ITERATORS_BPF_SKEL_H__
+
+#include <stdlib.h>
+#include <bpf/libbpf.h>
+
+struct iterators_bpf {
+ struct bpf_object_skeleton *skeleton;
+ struct bpf_object *obj;
+ struct {
+ struct bpf_map *rodata;
+ } maps;
+ struct {
+ struct bpf_program *dump_bpf_map;
+ struct bpf_program *dump_bpf_prog;
+ } progs;
+ struct {
+ struct bpf_link *dump_bpf_map;
+ struct bpf_link *dump_bpf_prog;
+ } links;
+ struct iterators_bpf__rodata {
+ char dump_bpf_map____fmt[35];
+ char dump_bpf_map____fmt_1[14];
+ char dump_bpf_prog____fmt[32];
+ char dump_bpf_prog____fmt_2[17];
+ } *rodata;
+};
+
+static void
+iterators_bpf__destroy(struct iterators_bpf *obj)
+{
+ if (!obj)
+ return;
+ if (obj->skeleton)
+ bpf_object__destroy_skeleton(obj->skeleton);
+ free(obj);
+}
+
+static inline int
+iterators_bpf__create_skeleton(struct iterators_bpf *obj);
+
+static inline struct iterators_bpf *
+iterators_bpf__open_opts(const struct bpf_object_open_opts *opts)
+{
+ struct iterators_bpf *obj;
+
+ obj = (struct iterators_bpf *)calloc(1, sizeof(*obj));
+ if (!obj)
+ return NULL;
+ if (iterators_bpf__create_skeleton(obj))
+ goto err;
+ if (bpf_object__open_skeleton(obj->skeleton, opts))
+ goto err;
+
+ return obj;
+err:
+ iterators_bpf__destroy(obj);
+ return NULL;
+}
+
+static inline struct iterators_bpf *
+iterators_bpf__open(void)
+{
+ return iterators_bpf__open_opts(NULL);
+}
+
+static inline int
+iterators_bpf__load(struct iterators_bpf *obj)
+{
+ return bpf_object__load_skeleton(obj->skeleton);
+}
+
+static inline struct iterators_bpf *
+iterators_bpf__open_and_load(void)
+{
+ struct iterators_bpf *obj;
+
+ obj = iterators_bpf__open();
+ if (!obj)
+ return NULL;
+ if (iterators_bpf__load(obj)) {
+ iterators_bpf__destroy(obj);
+ return NULL;
+ }
+ return obj;
+}
+
+static inline int
+iterators_bpf__attach(struct iterators_bpf *obj)
+{
+ return bpf_object__attach_skeleton(obj->skeleton);
+}
+
+static inline void
+iterators_bpf__detach(struct iterators_bpf *obj)
+{
+ return bpf_object__detach_skeleton(obj->skeleton);
+}
+
+static inline int
+iterators_bpf__create_skeleton(struct iterators_bpf *obj)
+{
+ struct bpf_object_skeleton *s;
+
+ s = (struct bpf_object_skeleton *)calloc(1, sizeof(*s));
+ if (!s)
+ return -1;
+ obj->skeleton = s;
+
+ s->sz = sizeof(*s);
+ s->name = "iterators_bpf";
+ s->obj = &obj->obj;
+
+ /* maps */
+ s->map_cnt = 1;
+ s->map_skel_sz = sizeof(*s->maps);
+ s->maps = (struct bpf_map_skeleton *)calloc(s->map_cnt, s->map_skel_sz);
+ if (!s->maps)
+ goto err;
+
+ s->maps[0].name = "iterator.rodata";
+ s->maps[0].map = &obj->maps.rodata;
+ s->maps[0].mmaped = (void **)&obj->rodata;
+
+ /* programs */
+ s->prog_cnt = 2;
+ s->prog_skel_sz = sizeof(*s->progs);
+ s->progs = (struct bpf_prog_skeleton *)calloc(s->prog_cnt, s->prog_skel_sz);
+ if (!s->progs)
+ goto err;
+
+ s->progs[0].name = "dump_bpf_map";
+ s->progs[0].prog = &obj->progs.dump_bpf_map;
+ s->progs[0].link = &obj->links.dump_bpf_map;
+
+ s->progs[1].name = "dump_bpf_prog";
+ s->progs[1].prog = &obj->progs.dump_bpf_prog;
+ s->progs[1].link = &obj->links.dump_bpf_prog;
+
+ s->data_sz = 7176;
+ s->data = (void *)"\
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+\x07\0\0\0\x09\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x40\x13\0\0\0\0\0\0\xe0\
+\x03\0\0\0\0\0\0\x08\0\0\0\x07\0\0\0\x08\0\0\0\0\0\0\0\x10\0\0\0\0\0\0\0\x7b\0\
+\0\0\x03\x4c\xff\x6f\0\0\0\x80\0\0\0\0\0\0\0\0\0\0\0\0\x20\x17\0\0\0\0\0\0\x07\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\xa1\0\0\0\x03\
+\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x27\x17\0\0\0\0\0\0\x1a\x01\0\0\0\0\0\0\
+\0\0\0\0\0\0\0\0\x01\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
+
+ return 0;
+err:
+ bpf_object__destroy_skeleton(s);
+ return -1;
+}
+
+#endif /* __ITERATORS_BPF_SKEL_H__ */