From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 55917C71155 for ; Mon, 23 Nov 2020 13:14:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EE02B2075A for ; Mon, 23 Nov 2020 13:14:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="e/fL5puQ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388558AbgKWNNi (ORCPT ); Mon, 23 Nov 2020 08:13:38 -0500 Received: from us-smtp-delivery-124.mimecast.com ([63.128.21.124]:27024 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388522AbgKWNNg (ORCPT ); Mon, 23 Nov 2020 08:13:36 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1606137212; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=mgDD3hZuqRpdyTLabxn5w6eqJnCMSPbJaLGE+s8ZXRg=; b=e/fL5puQ/ar0k4i3qQyAh0SEJAh+rysGOcS7Ys497k7ecHtfYG/Fn843Bk36QffiOUZpB2 h1aCxM7xp8rhIc6gqFDOFFrjA/JwD51oy7wPzMMghDCKNN+JRG8MbCiPBk03yl9dH2EQ1f 4nP2O0JK9BvNlo5SpACD4XO0oQyjXa0= Received: from mail-pg1-f197.google.com (mail-pg1-f197.google.com [209.85.215.197]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-310-BYrjaEwdP2ufjP10YIvgLQ-1; Mon, 23 Nov 2020 08:13:31 -0500 X-MC-Unique: BYrjaEwdP2ufjP10YIvgLQ-1 Received: by mail-pg1-f197.google.com with SMTP id c4so11845125pgb.0 for ; Mon, 23 Nov 2020 05:13:30 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=mgDD3hZuqRpdyTLabxn5w6eqJnCMSPbJaLGE+s8ZXRg=; b=TOxKDr87sF6AL8FzCyfLnbaYLYAmG3j7kyrzNOEvihcFyafmRaAGeSmLL9zfokXWNW 0acyianttdeXMvQC09mRR++DuzBE1S3ga+kPX1EtbIR2PkFIocBtrsWuyRXxc4SfHdm6 Cu1zXZVRNEzHA8Wz911YP/MH44XKumecUYlQffpnb5XNvgiEsePvvf+OBaGhNasIGvpk a4ZQridLrdW3TGgJ0qn9hR72rCS6bnykPmkuM/4TeYeFgZMLgIIgEfW7uRrJyXw0W2YY 486s/iMAtPtB4k0BD0zI9Elrz+vEv3UIxhkOvFMLhJz9EtKx8hJ4n0xVdStrEb1ne4wy LUXg== X-Gm-Message-State: AOAM533s5cAHJSKwcMx3579npElrp80/NbtoQ5u1Tm4wWYItPKTsye5r 1gJlUGXVx7/b2u2kVojxeY20bz+0JEzMQtjGDY4BkbBCx495GRK+8Wu2XjIaT3m59wEFF6c3Cco Ybw4mD5RDRik= X-Received: by 2002:a17:90a:1bcb:: with SMTP id r11mr23326099pjr.27.1606137209792; Mon, 23 Nov 2020 05:13:29 -0800 (PST) X-Google-Smtp-Source: ABdhPJzkXuNP927CTEDXqn0ipJvSVQNKrMNcIiVwdIbEqq3b3tozgVLcVNugnvTQi3BfV4R5wbr0aQ== X-Received: by 2002:a17:90a:1bcb:: with SMTP id r11mr23326082pjr.27.1606137209500; Mon, 23 Nov 2020 05:13:29 -0800 (PST) Received: from localhost.localdomain.com ([209.132.188.80]) by smtp.gmail.com with ESMTPSA id 84sm12075505pfu.53.2020.11.23.05.13.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 23 Nov 2020 05:13:28 -0800 (PST) From: Hangbin Liu To: Stephen Hemminger , David Ahern Cc: Daniel Borkmann , Martin KaFai Lau , Song Liu , Yonghong Song , David Miller , netdev@vger.kernel.org, bpf@vger.kernel.org, Jiri Benc , =?UTF-8?q?Toke=20H=C3=B8iland-J=C3=B8rgensen?= , Jesper Dangaard Brouer , Alexei Starovoitov , Hangbin Liu Subject: [PATCHv6 iproute2-next 3/5] lib: add libbpf support Date: Mon, 23 Nov 2020 21:11:59 +0800 Message-Id: <20201123131201.4108483-4-haliu@redhat.com> X-Mailer: git-send-email 2.25.4 In-Reply-To: <20201123131201.4108483-1-haliu@redhat.com> References: <20201116065305.1010651-1-haliu@redhat.com> <20201123131201.4108483-1-haliu@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org This patch converts iproute2 to use libbpf for loading and attaching BPF programs when it is available, which is started by Toke's implementation[1]. With libbpf iproute2 could correctly process BTF information and support the new-style BTF-defined maps, while keeping compatibility with the old internal map definition syntax. The old iproute2 bpf code is kept and will be used if no suitable libbpf is available. When using libbpf, wrapper code in bpf_legacy.c ensures that iproute2 will still understand the old map definition format, including populating map-in-map and tail call maps before load. In bpf_libbpf.c, we init iproute2 ctx and elf info first to check the legacy bytes. When handling the legacy maps, for map-in-maps, we create them manually and re-use the fd as they are associated with id/inner_id. For pin maps, we only set the pin path and let libbp load to handle it. For tail calls, we find it first and update the element after prog load. Other maps/progs will be loaded by libbpf directly. [1] https://lore.kernel.org/bpf/20190820114706.18546-1-toke@redhat.com/ Reviewed-by: Toke Høiland-Jørgensen Signed-off-by: Hangbin Liu --- v6: also make bpf_libbpf.c build depend on HAVE_ELF v5: no update v4: Move ipvrf code to patch 02 Move HAVE_LIBBPF inside HAVE_ELF definition as libbpf depends on elf. v3: Add a new function get_bpf_program__section_name() to choose whether use bpf_program__title() or not. v2: Remove self defined IS_ERR_OR_NULL and use libbpf_get_error() instead. Add ipvrf with libbpf support. --- include/bpf_util.h | 17 +++ lib/Makefile | 6 + lib/bpf_legacy.c | 178 +++++++++++++++++++++++ lib/bpf_libbpf.c | 348 +++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 549 insertions(+) create mode 100644 lib/bpf_libbpf.c diff --git a/include/bpf_util.h b/include/bpf_util.h index 3235c34e..53acc410 100644 --- a/include/bpf_util.h +++ b/include/bpf_util.h @@ -291,6 +291,16 @@ int bpf_dump_prog_info(FILE *f, uint32_t id); int bpf_send_map_fds(const char *path, const char *obj); int bpf_recv_map_fds(const char *path, int *fds, struct bpf_map_aux *aux, unsigned int entries); +#ifdef HAVE_LIBBPF +int iproute2_bpf_elf_ctx_init(struct bpf_cfg_in *cfg); +int iproute2_bpf_fetch_ancillary(void); +int iproute2_get_root_path(char *root_path, size_t len); +bool iproute2_is_pin_map(const char *libbpf_map_name, char *pathname); +bool iproute2_is_map_in_map(const char *libbpf_map_name, struct bpf_elf_map *imap, + struct bpf_elf_map *omap, char *omap_name); +int iproute2_find_map_name_by_id(unsigned int map_id, char *name); +int iproute2_load_libbpf(struct bpf_cfg_in *cfg); +#endif /* HAVE_LIBBPF */ #else static inline int bpf_send_map_fds(const char *path, const char *obj) { @@ -303,6 +313,13 @@ static inline int bpf_recv_map_fds(const char *path, int *fds, { return -1; } +#ifdef HAVE_LIBBPF +static inline int iproute2_load_libbpf(struct bpf_cfg_in *cfg) +{ + fprintf(stderr, "No ELF library support compiled in.\n"); + return -1; +} +#endif /* HAVE_LIBBPF */ #endif /* HAVE_ELF */ const char *get_libbpf_version(void); diff --git a/lib/Makefile b/lib/Makefile index 7c8a197c..e37585c6 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -7,6 +7,12 @@ UTILOBJ = utils.o rt_names.o ll_map.o ll_types.o ll_proto.o ll_addr.o \ inet_proto.o namespace.o json_writer.o json_print.o \ names.o color.o bpf_legacy.o bpf_glue.o exec.o fs.o cg_map.o +ifeq ($(HAVE_ELF),y) +ifeq ($(HAVE_LIBBPF),y) +UTILOBJ += bpf_libbpf.o +endif +endif + NLOBJ=libgenl.o libnetlink.o mnl_utils.o all: libnetlink.a libutil.a diff --git a/lib/bpf_legacy.c b/lib/bpf_legacy.c index 4246fb76..bc869c3f 100644 --- a/lib/bpf_legacy.c +++ b/lib/bpf_legacy.c @@ -940,6 +940,9 @@ static int bpf_do_parse(struct bpf_cfg_in *cfg, const bool *opt_tbl) static int bpf_do_load(struct bpf_cfg_in *cfg) { if (cfg->mode == EBPF_OBJECT) { +#ifdef HAVE_LIBBPF + return iproute2_load_libbpf(cfg); +#endif cfg->prog_fd = bpf_obj_open(cfg->object, cfg->type, cfg->section, cfg->ifindex, cfg->verbose); @@ -3155,4 +3158,179 @@ int bpf_recv_map_fds(const char *path, int *fds, struct bpf_map_aux *aux, close(fd); return ret; } + +#ifdef HAVE_LIBBPF +/* The following functions are wrapper functions for libbpf code to be + * compatible with the legacy format. So all the functions have prefix + * with iproute2_ + */ +int iproute2_bpf_elf_ctx_init(struct bpf_cfg_in *cfg) +{ + struct bpf_elf_ctx *ctx = &__ctx; + + return bpf_elf_ctx_init(ctx, cfg->object, cfg->type, cfg->ifindex, cfg->verbose); +} + +int iproute2_bpf_fetch_ancillary(void) +{ + struct bpf_elf_ctx *ctx = &__ctx; + struct bpf_elf_sec_data data; + int i, ret = 0; + + for (i = 1; i < ctx->elf_hdr.e_shnum; i++) { + ret = bpf_fill_section_data(ctx, i, &data); + if (ret < 0) + continue; + + if (data.sec_hdr.sh_type == SHT_PROGBITS && + !strcmp(data.sec_name, ELF_SECTION_MAPS)) + ret = bpf_fetch_maps_begin(ctx, i, &data); + else if (data.sec_hdr.sh_type == SHT_SYMTAB && + !strcmp(data.sec_name, ".symtab")) + ret = bpf_fetch_symtab(ctx, i, &data); + else if (data.sec_hdr.sh_type == SHT_STRTAB && + !strcmp(data.sec_name, ".strtab")) + ret = bpf_fetch_strtab(ctx, i, &data); + if (ret < 0) { + fprintf(stderr, "Error parsing section %d! Perhaps check with readelf -a?\n", + i); + return ret; + } + } + + if (bpf_has_map_data(ctx)) { + ret = bpf_fetch_maps_end(ctx); + if (ret < 0) { + fprintf(stderr, "Error fixing up map structure, incompatible struct bpf_elf_map used?\n"); + return ret; + } + } + + return ret; +} + +int iproute2_get_root_path(char *root_path, size_t len) +{ + struct bpf_elf_ctx *ctx = &__ctx; + int ret = 0; + + snprintf(root_path, len, "%s/%s", + bpf_get_work_dir(ctx->type), BPF_DIR_GLOBALS); + + ret = mkdir(root_path, S_IRWXU); + if (ret && errno != EEXIST) { + fprintf(stderr, "mkdir %s failed: %s\n", root_path, strerror(errno)); + return ret; + } + + return 0; +} + +bool iproute2_is_pin_map(const char *libbpf_map_name, char *pathname) +{ + struct bpf_elf_ctx *ctx = &__ctx; + const char *map_name, *tmp; + unsigned int pinning; + int i, ret = 0; + + for (i = 0; i < ctx->map_num; i++) { + if (ctx->maps[i].pinning == PIN_OBJECT_NS && + ctx->noafalg) { + fprintf(stderr, "Missing kernel AF_ALG support for PIN_OBJECT_NS!\n"); + return false; + } + + map_name = bpf_map_fetch_name(ctx, i); + if (!map_name) { + return false; + } + + if (strcmp(libbpf_map_name, map_name)) + continue; + + pinning = ctx->maps[i].pinning; + + if (bpf_no_pinning(ctx, pinning) || !bpf_get_work_dir(ctx->type)) + return false; + + if (pinning == PIN_OBJECT_NS) + ret = bpf_make_obj_path(ctx); + else if ((tmp = bpf_custom_pinning(ctx, pinning))) + ret = bpf_make_custom_path(ctx, tmp); + if (ret < 0) + return false; + + bpf_make_pathname(pathname, PATH_MAX, map_name, ctx, pinning); + + return true; + } + + return false; +} + +bool iproute2_is_map_in_map(const char *libbpf_map_name, struct bpf_elf_map *imap, + struct bpf_elf_map *omap, char *omap_name) +{ + struct bpf_elf_ctx *ctx = &__ctx; + const char *inner_map_name, *outer_map_name; + int i, j; + + for (i = 0; i < ctx->map_num; i++) { + inner_map_name = bpf_map_fetch_name(ctx, i); + if (!inner_map_name) { + return false; + } + + if (strcmp(libbpf_map_name, inner_map_name)) + continue; + + if (!ctx->maps[i].id || + ctx->maps[i].inner_id || + ctx->maps[i].inner_idx == -1) + continue; + + *imap = ctx->maps[i]; + + for (j = 0; j < ctx->map_num; j++) { + if (!bpf_is_map_in_map_type(&ctx->maps[j])) + continue; + if (ctx->maps[j].inner_id != ctx->maps[i].id) + continue; + + *omap = ctx->maps[j]; + outer_map_name = bpf_map_fetch_name(ctx, j); + memcpy(omap_name, outer_map_name, strlen(outer_map_name) + 1); + + return true; + } + } + + return false; +} + +int iproute2_find_map_name_by_id(unsigned int map_id, char *name) +{ + struct bpf_elf_ctx *ctx = &__ctx; + const char *map_name; + int i, idx = -1; + + for (i = 0; i < ctx->map_num; i++) { + if (ctx->maps[i].id == map_id && + ctx->maps[i].type == BPF_MAP_TYPE_PROG_ARRAY) { + idx = i; + break; + } + } + + if (idx < 0) + return -1; + + map_name = bpf_map_fetch_name(ctx, idx); + if (!map_name) + return -1; + + memcpy(name, map_name, strlen(map_name) + 1); + return 0; +} +#endif /* HAVE_LIBBPF */ #endif /* HAVE_ELF */ diff --git a/lib/bpf_libbpf.c b/lib/bpf_libbpf.c new file mode 100644 index 00000000..d05737a4 --- /dev/null +++ b/lib/bpf_libbpf.c @@ -0,0 +1,348 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * bpf_libbpf.c BPF code relay on libbpf + * Authors: Hangbin Liu + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include +#include + +#include "bpf_util.h" + +static int verbose_print(enum libbpf_print_level level, const char *format, va_list args) +{ + return vfprintf(stderr, format, args); +} + +static int silent_print(enum libbpf_print_level level, const char *format, va_list args) +{ + if (level > LIBBPF_WARN) + return 0; + + /* Skip warning from bpf_object__init_user_maps() for legacy maps */ + if (strstr(format, "has unrecognized, non-zero options")) + return 0; + + return vfprintf(stderr, format, args); +} + +static const char *get_bpf_program__section_name(const struct bpf_program *prog) +{ +#ifdef HAVE_LIBBPF_SECTION_NAME + return bpf_program__section_name(prog); +#else + return bpf_program__title(prog, false); +#endif +} + +static int create_map(const char *name, struct bpf_elf_map *map, + __u32 ifindex, int inner_fd) +{ + struct bpf_create_map_attr map_attr = {}; + + map_attr.name = name; + map_attr.map_type = map->type; + map_attr.map_flags = map->flags; + map_attr.key_size = map->size_key; + map_attr.value_size = map->size_value; + map_attr.max_entries = map->max_elem; + map_attr.map_ifindex = ifindex; + map_attr.inner_map_fd = inner_fd; + + return bpf_create_map_xattr(&map_attr); +} + +static int create_map_in_map(struct bpf_object *obj, struct bpf_map *map, + struct bpf_elf_map *elf_map, int inner_fd, + bool *reuse_pin_map) +{ + char pathname[PATH_MAX]; + const char *map_name; + bool pin_map = false; + int map_fd, ret = 0; + + map_name = bpf_map__name(map); + + if (iproute2_is_pin_map(map_name, pathname)) { + pin_map = true; + + /* Check if there already has a pinned map */ + map_fd = bpf_obj_get(pathname); + if (map_fd > 0) { + if (reuse_pin_map) + *reuse_pin_map = true; + close(map_fd); + return bpf_map__set_pin_path(map, pathname); + } + } + + map_fd = create_map(map_name, elf_map, bpf_map__ifindex(map), inner_fd); + if (map_fd < 0) { + fprintf(stderr, "create map %s failed\n", map_name); + return map_fd; + } + + ret = bpf_map__reuse_fd(map, map_fd); + if (ret < 0) { + fprintf(stderr, "map %s reuse fd failed\n", map_name); + goto err_out; + } + + if (pin_map) { + ret = bpf_map__set_pin_path(map, pathname); + if (ret < 0) + goto err_out; + } + + return 0; +err_out: + close(map_fd); + return ret; +} + +static int +handle_legacy_map_in_map(struct bpf_object *obj, struct bpf_map *inner_map, + const char *inner_map_name) +{ + int inner_fd, outer_fd, inner_idx, ret = 0; + struct bpf_elf_map imap, omap; + struct bpf_map *outer_map; + /* What's the size limit of map name? */ + char outer_map_name[128]; + bool reuse_pin_map = false; + + /* Deal with map-in-map */ + if (iproute2_is_map_in_map(inner_map_name, &imap, &omap, outer_map_name)) { + ret = create_map_in_map(obj, inner_map, &imap, -1, NULL); + if (ret < 0) + return ret; + + inner_fd = bpf_map__fd(inner_map); + outer_map = bpf_object__find_map_by_name(obj, outer_map_name); + ret = create_map_in_map(obj, outer_map, &omap, inner_fd, &reuse_pin_map); + if (ret < 0) + return ret; + + if (!reuse_pin_map) { + inner_idx = imap.inner_idx; + outer_fd = bpf_map__fd(outer_map); + ret = bpf_map_update_elem(outer_fd, &inner_idx, &inner_fd, 0); + if (ret < 0) + fprintf(stderr, "Cannot update inner_idx into outer_map\n"); + } + } + + return ret; +} + +static int find_legacy_tail_calls(struct bpf_program *prog, struct bpf_object *obj) +{ + unsigned int map_id, key_id; + const char *sec_name; + struct bpf_map *map; + char map_name[128]; + int ret; + + /* Handle iproute2 tail call */ + sec_name = get_bpf_program__section_name(prog); + ret = sscanf(sec_name, "%i/%i", &map_id, &key_id); + if (ret != 2) + return -1; + + ret = iproute2_find_map_name_by_id(map_id, map_name); + if (ret < 0) { + fprintf(stderr, "unable to find map id %u for tail call\n", map_id); + return ret; + } + + map = bpf_object__find_map_by_name(obj, map_name); + if (!map) + return -1; + + /* Save the map here for later updating */ + bpf_program__set_priv(prog, map, NULL); + + return 0; +} + +static int update_legacy_tail_call_maps(struct bpf_object *obj) +{ + int prog_fd, map_fd, ret = 0; + unsigned int map_id, key_id; + struct bpf_program *prog; + const char *sec_name; + struct bpf_map *map; + + bpf_object__for_each_program(prog, obj) { + map = bpf_program__priv(prog); + if (!map) + continue; + + prog_fd = bpf_program__fd(prog); + if (prog_fd < 0) + continue; + + sec_name = get_bpf_program__section_name(prog); + ret = sscanf(sec_name, "%i/%i", &map_id, &key_id); + if (ret != 2) + continue; + + map_fd = bpf_map__fd(map); + ret = bpf_map_update_elem(map_fd, &key_id, &prog_fd, 0); + if (ret < 0) { + fprintf(stderr, "Cannot update map key for tail call!\n"); + return ret; + } + } + + return 0; +} + +static int handle_legacy_maps(struct bpf_object *obj) +{ + char pathname[PATH_MAX]; + struct bpf_map *map; + const char *map_name; + int map_fd, ret = 0; + + bpf_object__for_each_map(map, obj) { + map_name = bpf_map__name(map); + + ret = handle_legacy_map_in_map(obj, map, map_name); + if (ret) + return ret; + + /* If it is a iproute2 legacy pin maps, just set pin path + * and let bpf_object__load() to deal with the map creation. + * We need to ignore map-in-maps which have pinned maps manually + */ + map_fd = bpf_map__fd(map); + if (map_fd < 0 && iproute2_is_pin_map(map_name, pathname)) { + ret = bpf_map__set_pin_path(map, pathname); + if (ret) { + fprintf(stderr, "map '%s': couldn't set pin path.\n", map_name); + break; + } + } + + } + + return ret; +} + +static int load_bpf_object(struct bpf_cfg_in *cfg) +{ + struct bpf_program *p, *prog = NULL; + struct bpf_object *obj; + char root_path[PATH_MAX]; + struct bpf_map *map; + int prog_fd, ret = 0; + + ret = iproute2_get_root_path(root_path, PATH_MAX); + if (ret) + return ret; + + DECLARE_LIBBPF_OPTS(bpf_object_open_opts, open_opts, + .relaxed_maps = true, + .pin_root_path = root_path, + ); + + obj = bpf_object__open_file(cfg->object, &open_opts); + if (libbpf_get_error(obj)) { + fprintf(stderr, "ERROR: opening BPF object file failed\n"); + return -ENOENT; + } + + bpf_object__for_each_program(p, obj) { + /* Only load the programs that will either be subsequently + * attached or inserted into a tail call map */ + if (find_legacy_tail_calls(p, obj) < 0 && cfg->section && + strcmp(get_bpf_program__section_name(p), cfg->section)) { + ret = bpf_program__set_autoload(p, false); + if (ret) + return -EINVAL; + continue; + } + + bpf_program__set_type(p, cfg->type); + bpf_program__set_ifindex(p, cfg->ifindex); + if (!prog) + prog = p; + } + + bpf_object__for_each_map(map, obj) { + if (!bpf_map__is_offload_neutral(map)) + bpf_map__set_ifindex(map, cfg->ifindex); + } + + if (!prog) { + fprintf(stderr, "object file doesn't contain sec %s\n", cfg->section); + return -ENOENT; + } + + /* Handle iproute2 legacy pin maps and map-in-maps */ + ret = handle_legacy_maps(obj); + if (ret) + goto unload_obj; + + ret = bpf_object__load(obj); + if (ret) + goto unload_obj; + + ret = update_legacy_tail_call_maps(obj); + if (ret) + goto unload_obj; + + prog_fd = fcntl(bpf_program__fd(prog), F_DUPFD_CLOEXEC, 1); + if (prog_fd < 0) + ret = -errno; + else + cfg->prog_fd = prog_fd; + +unload_obj: + /* Close obj as we don't need it */ + bpf_object__close(obj); + return ret; +} + +/* Load ebpf and return prog fd */ +int iproute2_load_libbpf(struct bpf_cfg_in *cfg) +{ + int ret = 0; + + if (cfg->verbose) + libbpf_set_print(verbose_print); + else + libbpf_set_print(silent_print); + + ret = iproute2_bpf_elf_ctx_init(cfg); + if (ret < 0) { + fprintf(stderr, "Cannot initialize ELF context!\n"); + return ret; + } + + ret = iproute2_bpf_fetch_ancillary(); + if (ret < 0) { + fprintf(stderr, "Error fetching ELF ancillary data!\n"); + return ret; + } + + ret = load_bpf_object(cfg); + if (ret) + return ret; + + return cfg->prog_fd; +} -- 2.25.4