From patchwork Fri Jan 22 02:50:07 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hangbin Liu X-Patchwork-Id: 12038221 X-Patchwork-Delegate: bpf@iogearbox.net 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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 0F37FC433E0 for ; Fri, 22 Jan 2021 02:51:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C9ACD22C7D for ; Fri, 22 Jan 2021 02:51:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726205AbhAVCvH (ORCPT ); Thu, 21 Jan 2021 21:51:07 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43026 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726160AbhAVCvE (ORCPT ); Thu, 21 Jan 2021 21:51:04 -0500 Received: from mail-pg1-x52e.google.com (mail-pg1-x52e.google.com [IPv6:2607:f8b0:4864:20::52e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CC5DEC06174A; Thu, 21 Jan 2021 18:50:23 -0800 (PST) Received: by mail-pg1-x52e.google.com with SMTP id 15so2703979pgx.7; Thu, 21 Jan 2021 18:50:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=9n3d6B2vmrJ2e4LC/3YOKjWhI9zMjUohkEnsjz7eECE=; b=o/fQ4sGvpzlc5uSA5SEIKl4Xj1zeNVijPVeJ0a7yThkqmoYAXwmCxxqpISj3YabfJZ +LldDM2Q4yNgFhNRsu7a94aPu1TW8TXBxAVzD5XeBO4nXO+o3j73PvLZUR/lXuHkBO+C FoQ4dTgKg6G/v4dVqF/TNRp+6QqRRuMigIUjN6ZmejVnSJDyoLvTa51Xj4qNZ/umH5t6 E34SMhmCnskY/4K65bi9/H8spqDHTnUaUFvqFdtlRkSTKbErBBERfUBYnTm0UEsfZFDe fLxYJRJaQjKI2Ocguq0krZRbs8j8YaMJNGtX9acvzX/9BthsFIGo933QQozPyqEDrgej VeIg== 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=9n3d6B2vmrJ2e4LC/3YOKjWhI9zMjUohkEnsjz7eECE=; b=eGcHzCnfJu45kGQ4riPi/2ZhG08pI/g2UUymalovSfAt0McfDjQMr/xWWIEii3kdA1 I25NrZal7/FtkjdKS6IU21HBXJ0BT6/HuA0RAWK78lv0yxMYF94NgMmv9ldFptY+BCQb P+mK6uP/DaS33wHJ7EWK86XLSvKVNwzcINpK/gL/O0MhaIt76nw+vAdWsYaZozh6VACG 7PAEbfL9u+BHo6KbTqgPrz5TQlFWipkhA4wSqsSyFVJKbmi/zkyIfhni2au/6hyY21l/ sM0Fml4BNmzBK6GlN8V6CmKZszkrcwcCno8oXppnap/9Z+3QpKqexBiS6N0LHZCP2u9z UDeA== X-Gm-Message-State: AOAM531EX4TNR6pTFOw9xXnYZCKYyAZEIetLViub813LdQzIXvhVb2Us TDTrwZZB5JbKe1nBbVNKqvWe01h+WRgWUFZ6 X-Google-Smtp-Source: ABdhPJzEa81GbVPmZMQy5yh2H7XezZKr3p8WJUHJf5lMtTJ/TvbMzKXnxIEVMwtAIbILLq097PE5lw== X-Received: by 2002:a63:505d:: with SMTP id q29mr2438857pgl.241.1611283823031; Thu, 21 Jan 2021 18:50:23 -0800 (PST) Received: from Leo-laptop-t470s.redhat.com ([209.132.188.80]) by smtp.gmail.com with ESMTPSA id m3sm6574003pfa.134.2021.01.21.18.50.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 Jan 2021 18:50:22 -0800 (PST) From: Hangbin Liu To: bpf@vger.kernel.org Cc: netdev@vger.kernel.org, Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , Yonghong Song , =?utf-8?q?Toke_H=C3=B8iland-J=C3=B8rgensen?= , Hangbin Liu Subject: [PATCHv10 bpf-next] samples/bpf: add xdp program on egress for xdp_redirect_map Date: Fri, 22 Jan 2021 10:50:07 +0800 Message-Id: <20210122025007.2968381-1-liuhangbin@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210121130642.2943811-1-liuhangbin@gmail.com> References: <20210121130642.2943811-1-liuhangbin@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net This patch add a xdp program on egress to show that we can modify the packet on egress. In this sample we will set the pkt's src mac to egress's mac address. The xdp_prog will be attached when -X option supplied. Signed-off-by: Hangbin Liu Acked-by: Jesper Dangaard Brouer --- v10: make xdp_redirect_map() always inline. v9: roll back to just set src mac to egress interface mac on 2nd xdp prog, this could avoid packet reorder introduce in patch v6. v8: Fix some checkpatch issues. v7: a) use bpf_object__find_program_by_name() instad of bpf_object__find_program_by_title() b) set default devmap fd to 0 v6: no code update, only rebase the code on latest bpf-next v5: a) close fd when err out in get_mac_addr() b) exit program when both -S and -X supplied. v4: a) Update get_mac_addr socket create b) Load dummy prog regardless of 2nd xdp prog on egress v3: a) modify the src mac address based on egress mac v2: a) use pkt counter instead of IP ttl modification on egress program b) make the egress program selectable by option -X --- samples/bpf/xdp_redirect_map_kern.c | 60 +++++++++++++-- samples/bpf/xdp_redirect_map_user.c | 112 +++++++++++++++++++++++----- 2 files changed, 147 insertions(+), 25 deletions(-) diff --git a/samples/bpf/xdp_redirect_map_kern.c b/samples/bpf/xdp_redirect_map_kern.c index 6489352ab7a4..a92b8e567bdd 100644 --- a/samples/bpf/xdp_redirect_map_kern.c +++ b/samples/bpf/xdp_redirect_map_kern.c @@ -19,12 +19,22 @@ #include #include +/* The 2nd xdp prog on egress does not support skb mode, so we define two + * maps, tx_port_general and tx_port_native. + */ struct { __uint(type, BPF_MAP_TYPE_DEVMAP); __uint(key_size, sizeof(int)); __uint(value_size, sizeof(int)); __uint(max_entries, 100); -} tx_port SEC(".maps"); +} tx_port_general SEC(".maps"); + +struct { + __uint(type, BPF_MAP_TYPE_DEVMAP); + __uint(key_size, sizeof(int)); + __uint(value_size, sizeof(struct bpf_devmap_val)); + __uint(max_entries, 100); +} tx_port_native SEC(".maps"); /* Count RX packets, as XDP bpf_prog doesn't get direct TX-success * feedback. Redirect TX errors can be caught via a tracepoint. @@ -36,6 +46,14 @@ struct { __uint(max_entries, 1); } rxcnt SEC(".maps"); +/* map to store egress interface mac address */ +struct { + __uint(type, BPF_MAP_TYPE_ARRAY); + __type(key, u32); + __type(value, __be64); + __uint(max_entries, 1); +} tx_mac SEC(".maps"); + static void swap_src_dst_mac(void *data) { unsigned short *p = data; @@ -52,17 +70,16 @@ static void swap_src_dst_mac(void *data) p[5] = dst[2]; } -SEC("xdp_redirect_map") -int xdp_redirect_map_prog(struct xdp_md *ctx) +static __always_inline int xdp_redirect_map(struct xdp_md *ctx, void *redirect_map) { void *data_end = (void *)(long)ctx->data_end; void *data = (void *)(long)ctx->data; struct ethhdr *eth = data; int rc = XDP_DROP; - int vport, port = 0, m = 0; long *value; u32 key = 0; u64 nh_off; + int vport; nh_off = sizeof(*eth); if (data + nh_off > data_end) @@ -79,7 +96,40 @@ int xdp_redirect_map_prog(struct xdp_md *ctx) swap_src_dst_mac(data); /* send packet out physical port */ - return bpf_redirect_map(&tx_port, vport, 0); + return bpf_redirect_map(redirect_map, vport, 0); +} + +SEC("xdp_redirect_general") +int xdp_redirect_map_general(struct xdp_md *ctx) +{ + return xdp_redirect_map(ctx, &tx_port_general); +} + +SEC("xdp_redirect_native") +int xdp_redirect_map_native(struct xdp_md *ctx) +{ + return xdp_redirect_map(ctx, &tx_port_native); +} + +SEC("xdp_devmap/map_prog") +int xdp_redirect_map_egress(struct xdp_md *ctx) +{ + void *data_end = (void *)(long)ctx->data_end; + void *data = (void *)(long)ctx->data; + struct ethhdr *eth = data; + __be64 *mac; + u32 key = 0; + u64 nh_off; + + nh_off = sizeof(*eth); + if (data + nh_off > data_end) + return XDP_DROP; + + mac = bpf_map_lookup_elem(&tx_mac, &key); + if (mac) + __builtin_memcpy(eth->h_source, mac, ETH_ALEN); + + return XDP_PASS; } /* Redirect require an XDP bpf_prog loaded on the TX device */ diff --git a/samples/bpf/xdp_redirect_map_user.c b/samples/bpf/xdp_redirect_map_user.c index 31131b6e7782..0e8192688dfc 100644 --- a/samples/bpf/xdp_redirect_map_user.c +++ b/samples/bpf/xdp_redirect_map_user.c @@ -14,6 +14,10 @@ #include #include #include +#include +#include +#include +#include #include "bpf_util.h" #include @@ -22,6 +26,7 @@ static int ifindex_in; static int ifindex_out; static bool ifindex_out_xdp_dummy_attached = true; +static bool xdp_devmap_attached; static __u32 prog_id; static __u32 dummy_prog_id; @@ -83,6 +88,32 @@ static void poll_stats(int interval, int ifindex) } } +static int get_mac_addr(unsigned int ifindex_out, void *mac_addr) +{ + char ifname[IF_NAMESIZE]; + struct ifreq ifr; + int fd, ret = -1; + + fd = socket(AF_INET, SOCK_DGRAM, 0); + if (fd < 0) + return ret; + + if (!if_indextoname(ifindex_out, ifname)) + goto err_out; + + strcpy(ifr.ifr_name, ifname); + + if (ioctl(fd, SIOCGIFHWADDR, &ifr) != 0) + goto err_out; + + memcpy(mac_addr, ifr.ifr_hwaddr.sa_data, 6 * sizeof(char)); + ret = 0; + +err_out: + close(fd); + return ret; +} + static void usage(const char *prog) { fprintf(stderr, @@ -90,24 +121,26 @@ static void usage(const char *prog) "OPTS:\n" " -S use skb-mode\n" " -N enforce native mode\n" - " -F force loading prog\n", + " -F force loading prog\n" + " -X load xdp program on egress\n", prog); } int main(int argc, char **argv) { struct bpf_prog_load_attr prog_load_attr = { - .prog_type = BPF_PROG_TYPE_XDP, + .prog_type = BPF_PROG_TYPE_UNSPEC, }; - struct bpf_program *prog, *dummy_prog; + struct bpf_program *prog, *dummy_prog, *devmap_prog; + int prog_fd, dummy_prog_fd, devmap_prog_fd = 0; + int tx_port_map_fd, tx_mac_map_fd; + struct bpf_devmap_val devmap_val; struct bpf_prog_info info = {}; __u32 info_len = sizeof(info); - int prog_fd, dummy_prog_fd; - const char *optstr = "FSN"; + const char *optstr = "FSNX"; struct bpf_object *obj; int ret, opt, key = 0; char filename[256]; - int tx_port_map_fd; while ((opt = getopt(argc, argv, optstr)) != -1) { switch (opt) { @@ -120,14 +153,21 @@ int main(int argc, char **argv) case 'F': xdp_flags &= ~XDP_FLAGS_UPDATE_IF_NOEXIST; break; + case 'X': + xdp_devmap_attached = true; + break; default: usage(basename(argv[0])); return 1; } } - if (!(xdp_flags & XDP_FLAGS_SKB_MODE)) + if (!(xdp_flags & XDP_FLAGS_SKB_MODE)) { xdp_flags |= XDP_FLAGS_DRV_MODE; + } else if (xdp_devmap_attached) { + printf("Load xdp program on egress with SKB mode not supported yet\n"); + return 1; + } if (optind == argc) { printf("usage: %s _IN _OUT\n", argv[0]); @@ -150,24 +190,28 @@ int main(int argc, char **argv) if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd)) return 1; - prog = bpf_program__next(NULL, obj); - dummy_prog = bpf_program__next(prog, obj); - if (!prog || !dummy_prog) { - printf("finding a prog in obj file failed\n"); - return 1; + if (xdp_flags & XDP_FLAGS_SKB_MODE) { + prog = bpf_object__find_program_by_name(obj, "xdp_redirect_map_general"); + tx_port_map_fd = bpf_object__find_map_fd_by_name(obj, "tx_port_general"); + } else { + prog = bpf_object__find_program_by_name(obj, "xdp_redirect_map_native"); + tx_port_map_fd = bpf_object__find_map_fd_by_name(obj, "tx_port_native"); + } + dummy_prog = bpf_object__find_program_by_name(obj, "xdp_redirect_dummy_prog"); + if (!prog || dummy_prog < 0 || tx_port_map_fd < 0) { + printf("finding prog/dummy_prog/tx_port_map in obj file failed\n"); + goto out; } - /* bpf_prog_load_xattr gives us the pointer to first prog's fd, - * so we're missing only the fd for dummy prog - */ + prog_fd = bpf_program__fd(prog); dummy_prog_fd = bpf_program__fd(dummy_prog); - if (prog_fd < 0 || dummy_prog_fd < 0) { + if (prog_fd < 0 || dummy_prog_fd < 0 || tx_port_map_fd < 0) { printf("bpf_prog_load_xattr: %s\n", strerror(errno)); return 1; } - tx_port_map_fd = bpf_object__find_map_fd_by_name(obj, "tx_port"); + tx_mac_map_fd = bpf_object__find_map_fd_by_name(obj, "tx_mac"); rxcnt_map_fd = bpf_object__find_map_fd_by_name(obj, "rxcnt"); - if (tx_port_map_fd < 0 || rxcnt_map_fd < 0) { + if (tx_mac_map_fd < 0 || rxcnt_map_fd < 0) { printf("bpf_object__find_map_fd_by_name failed\n"); return 1; } @@ -199,11 +243,39 @@ int main(int argc, char **argv) } dummy_prog_id = info.id; + /* Load 2nd xdp prog on egress. */ + if (xdp_devmap_attached) { + unsigned char mac_addr[6]; + + devmap_prog = bpf_object__find_program_by_name(obj, "xdp_redirect_map_egress"); + if (!devmap_prog) { + printf("finding devmap_prog in obj file failed\n"); + goto out; + } + devmap_prog_fd = bpf_program__fd(devmap_prog); + if (devmap_prog_fd < 0) { + printf("finding devmap_prog fd failed\n"); + goto out; + } + + if (get_mac_addr(ifindex_out, mac_addr) < 0) { + printf("get interface %d mac failed\n", ifindex_out); + goto out; + } + + ret = bpf_map_update_elem(tx_mac_map_fd, &key, mac_addr, 0); + if (ret) { + perror("bpf_update_elem tx_mac_map_fd"); + goto out; + } + } + signal(SIGINT, int_exit); signal(SIGTERM, int_exit); - /* populate virtual to physical port map */ - ret = bpf_map_update_elem(tx_port_map_fd, &key, &ifindex_out, 0); + devmap_val.ifindex = ifindex_out; + devmap_val.bpf_prog.fd = devmap_prog_fd; + ret = bpf_map_update_elem(tx_port_map_fd, &key, &devmap_val, 0); if (ret) { perror("bpf_update_elem"); goto out;