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=-15.7 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 E597EC433FE for ; Tue, 8 Dec 2020 12:03:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8C59E23AA9 for ; Tue, 8 Dec 2020 12:03:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729301AbgLHMC4 (ORCPT ); Tue, 8 Dec 2020 07:02:56 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43088 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726825AbgLHMC4 (ORCPT ); Tue, 8 Dec 2020 07:02:56 -0500 Received: from mail-pf1-x433.google.com (mail-pf1-x433.google.com [IPv6:2607:f8b0:4864:20::433]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1FE8CC06179C; Tue, 8 Dec 2020 04:02:16 -0800 (PST) Received: by mail-pf1-x433.google.com with SMTP id c79so13714506pfc.2; Tue, 08 Dec 2020 04:02:16 -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=LQzl3CuiTBAJ2hPWO7uWMXf67w2mBgNBYj9neG6gRZo=; b=kUlMGYM6ewIAEchPYwBK4zJehQh/CgAT4YZj4i76mkL8HfdWPl1rimqmFsIeGZAday 4y8ALSTV1vbpadvVxCJhAwei8FuDoR4LfNz6v2TWfIz+TF0o5UshLeTDUZfMHhyvTaNZ 6YwMQz2c4H86rs72XLiAHz48iy34m5+fgcbI+GpdYQd5ExZSFMwqYot6PPzFT+Mup4e/ 3famPnlZKuuPCheD427hG2DDTaJj2P8//kIGAAUJa6ndqKQI04QD76nPUSufXznZ3oeJ +ismfojog+ufXSqtk4i0y+LUwTf0FtK4y+G2Xj4z02S47LL7JsXzdtZ6kAEqtYAeYbtO ROgg== 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=LQzl3CuiTBAJ2hPWO7uWMXf67w2mBgNBYj9neG6gRZo=; b=E6JXdQEmHGiHh+ZBrCNW2uKIEeXqUOJLvA6m/DLuVyx51WkbffCvv28H7eOXF5CVqA 4XQOMaL5gSvo+Ncy4kYgDwSwIqecFJ40C8G3UMMx2suRC8aQnK2aBZPMrQMefUBA+Dqn ipnKIhIw0bSNVUIUrzk/8MZ5LX/FbqwQd+drfH9eOCxS//v+/MBR6GyNOKVwwfOfbhvH dWnX6CUT7lEWGObdY3b+4CZYSr+qElzXKH79U9edoaA6abCaApefoDDhpiL3rL+z6OPO xc1755+Ow7m5na1uWe+8xRQFdysAEneyqO/eJVc+4xogekPEW8O8L0IlHsykbAbyrHS2 Kenw== X-Gm-Message-State: AOAM5309DjJjOacJIXb6iZuhhFkR6Hg5i9YKfrqRUAKZsZG1maVfh7BW nmM3sgGksOmyb59K/w6iMc2a9WTQY2XBU5Oa X-Google-Smtp-Source: ABdhPJzYgc5B0JUaUSJyGQuQDUNpXTtU98+CX9h5ZC9wHxSJ8U9/qo2FRR0176GiUemYsXyREVC2bA== X-Received: by 2002:aa7:928c:0:b029:19a:de9d:fb11 with SMTP id j12-20020aa7928c0000b029019ade9dfb11mr20438934pfa.21.1607428935333; Tue, 08 Dec 2020 04:02:15 -0800 (PST) Received: from localhost.localdomain.com ([209.132.188.80]) by smtp.gmail.com with ESMTPSA id j10sm15377976pgc.85.2020.12.08.04.02.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 08 Dec 2020 04:02:14 -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=20H=C3=B8iland-J=C3=B8rgensen?= , Hangbin Liu Subject: [PATCHv4 bpf-next] samples/bpf: add xdp program on egress for xdp_redirect_map Date: Tue, 8 Dec 2020 20:01:59 +0800 Message-Id: <20201208120159.2278277-1-liuhangbin@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201208081856.1627657-1-liuhangbin@gmail.com> References: <20201208081856.1627657-1-liuhangbin@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org 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 --- v4: a) Update get_mac_addr socket creation 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 | 104 +++++++++++++++++++++++----- 2 files changed, 140 insertions(+), 24 deletions(-) diff --git a/samples/bpf/xdp_redirect_map_kern.c b/samples/bpf/xdp_redirect_map_kern.c index 6489352ab7a4..6b2164722649 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 stroe 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 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..9866d759bd11 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 = false; static __u32 prog_id; static __u32 dummy_prog_id; @@ -83,6 +88,29 @@ static void poll_stats(int interval, int ifindex) } } +static int get_mac_addr(unsigned int ifindex_out, void *mac_addr) +{ + struct ifreq ifr; + char ifname[IF_NAMESIZE]; + int fd = socket(AF_INET, SOCK_DGRAM, 0); + + if (fd < 0) + return -1; + + if (!if_indextoname(ifindex_out, ifname)) + return -1; + + strcpy(ifr.ifr_name, ifname); + + if (ioctl(fd, SIOCGIFHWADDR, &ifr) != 0) + return -1; + + memcpy(mac_addr, ifr.ifr_hwaddr.sa_data, 6 * sizeof(char)); + close(fd); + + return 0; +} + static void usage(const char *prog) { fprintf(stderr, @@ -90,24 +118,26 @@ 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 = -1; + 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) { @@ -120,6 +150,9 @@ 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; @@ -150,24 +183,28 @@ 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_title(obj, "xdp_redirect_general"); + tx_port_map_fd = bpf_object__find_map_fd_by_name(obj, "tx_port_general"); + } else { + prog = bpf_object__find_program_by_title(obj, "xdp_redirect_native"); + tx_port_map_fd = bpf_object__find_map_fd_by_name(obj, "tx_port_native"); } - /* bpf_prog_load_xattr gives us the pointer to first prog's fd, - * so we're missing only the fd for dummy prog - */ + dummy_prog = bpf_object__find_program_by_title(obj, "xdp_redirect_dummy"); + if (!prog || dummy_prog < 0 || tx_port_map_fd < 0) { + printf("finding prog/tx_port_map in obj file failed\n"); + goto out; + } + 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 +236,40 @@ 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_title(obj, "xdp_devmap/map_prog"); + 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; -- 2.26.2