diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2020-10-16 04:42:13 +0300 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-10-16 04:42:13 +0300 |
commit | 9ff9b0d392ea08090cd1780fb196f36dbb586529 (patch) | |
tree | 276a3a5c4525b84dee64eda30b423fc31bf94850 /kernel/bpf/preload | |
parent | 840e5bb326bbcb16ce82dd2416d2769de4839aea (diff) | |
parent | 105faa8742437c28815b2a3eb8314ebc5fd9288c (diff) | |
download | linux-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/.gitignore | 4 | ||||
-rw-r--r-- | kernel/bpf/preload/Kconfig | 26 | ||||
-rw-r--r-- | kernel/bpf/preload/Makefile | 25 | ||||
-rw-r--r-- | kernel/bpf/preload/bpf_preload.h | 16 | ||||
-rw-r--r-- | kernel/bpf/preload/bpf_preload_kern.c | 91 | ||||
-rw-r--r-- | kernel/bpf/preload/bpf_preload_umd_blob.S | 7 | ||||
-rw-r--r-- | kernel/bpf/preload/iterators/.gitignore | 2 | ||||
-rw-r--r-- | kernel/bpf/preload/iterators/Makefile | 57 | ||||
-rw-r--r-- | kernel/bpf/preload/iterators/README | 4 | ||||
-rw-r--r-- | kernel/bpf/preload/iterators/bpf_preload_common.h | 13 | ||||
-rw-r--r-- | kernel/bpf/preload/iterators/iterators.bpf.c | 114 | ||||
-rw-r--r-- | kernel/bpf/preload/iterators/iterators.c | 94 | ||||
-rw-r--r-- | kernel/bpf/preload/iterators/iterators.skel.h | 412 |
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 = 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