From patchwork Fri Apr 28 08:30:06 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gilad Sever X-Patchwork-Id: 13226075 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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 938CBC77B7E for ; Fri, 28 Apr 2023 08:30:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230071AbjD1Iak (ORCPT ); Fri, 28 Apr 2023 04:30:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51862 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345613AbjD1Iai (ORCPT ); Fri, 28 Apr 2023 04:30:38 -0400 Received: from mail-wm1-x330.google.com (mail-wm1-x330.google.com [IPv6:2a00:1450:4864:20::330]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CF7873A84; Fri, 28 Apr 2023 01:30:31 -0700 (PDT) Received: by mail-wm1-x330.google.com with SMTP id 5b1f17b1804b1-3f178da219bso94763065e9.1; Fri, 28 Apr 2023 01:30:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1682670630; x=1685262630; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=TwHBUAJ9XUSZ5oAcTZATwgJYopUydNJdA9+ydHABpYY=; b=IpTs0pkj6HYsTag5cWqD1wY3ov9B3H36r/ZqE0TWBslby115bhwUn68eaqcW3P0cTn N5k6dhMzZW6XmFbJmlDr0M/Py9Rrc2SDKJ5+OmolbyVeVkHUihTe4wJzn3YRAoJgSZEm bJkK/g5w/09v8WSqEMGUsgoWid3jiFqk3bHjOMhBJRX1XKQoauderfkpCjocA7S1VxUh EYEcghqjsUkbHWLWMWanjCQQj+XCBNZRaTg9KHIthQ1SyqOpKnaTisElCllxS5qnIny0 k3PFqcpYz7dDPGh95NQPqgINkJ6VxG3FAqpUJaHALnpuNqaYBN+C4cYqLUkcW0oj5hk4 pkfw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1682670630; x=1685262630; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=TwHBUAJ9XUSZ5oAcTZATwgJYopUydNJdA9+ydHABpYY=; b=Sdz2ZtX1Db+NBapY3FZJZT8Q0zn1VYkxZdipOyGUB9//73Ahyv+TSHk4XDrfpgFF/y jPJ7RD6BwCcjn3t6I2u2ZbKqyTMYv9nEcgUwzvKlkT7J/Hnl1Hynj/ERoJAQmJjY0umd 9uQIBvtMWy/MVt7pdLk2K4pa528npRlVUYQZIAkR0rqWi+2UgTJx3chHSA5/tJfFT9/B 9bTcHHwAMf0xRMq3bZRv9e22xHlEE1bujKZV8AcCWhW7X9OFLXsMMLyWoeAqmlj7aUTB V7UERXL2bioizJgA7zcd2smbKKKCSYAko97Ae08AqDJ2WuQ0LBL3jd2bEASSY4C/ozK3 W8Mw== X-Gm-Message-State: AC+VfDxz431dHjcISgUJPat2Ng0z2HgGNLJP+GkZwZabsuNEo50vt3G7 vVUZP2Krum5NyUg2NvKQsRc= X-Google-Smtp-Source: ACHHUZ5LE2nGFnDxnK0wk0wz9Hhl0j4u0dypNpkzi43bdpR970kWgMX7EKlotB1120jppHdRfdoJNQ== X-Received: by 2002:a1c:f217:0:b0:3f2:5be3:cd6a with SMTP id s23-20020a1cf217000000b003f25be3cd6amr3234928wmc.4.1682670629939; Fri, 28 Apr 2023 01:30:29 -0700 (PDT) Received: from gsever-Latitude-7400.corp.proofpoint.com ([2a0d:6fc2:43e5:9b00:5000:8721:8779:7e1]) by smtp.gmail.com with ESMTPSA id n12-20020a7bc5cc000000b003f17329f7f2sm23540545wmk.38.2023.04.28.01.30.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 28 Apr 2023 01:30:29 -0700 (PDT) From: Gilad Sever To: dsahern@kernel.org, martin.lau@linux.dev, daniel@iogearbox.net, john.fastabend@gmail.com, ast@kernel.org, andrii@kernel.org, song@kernel.org, yhs@fb.com, kpsingh@kernel.org, sdf@google.com, haoluo@google.com, jolsa@kernel.org, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, mykolal@fb.com, shuah@kernel.org, hawk@kernel.org, joe@wand.net.nz Cc: eyal.birger@gmail.com, shmulik.ladkani@gmail.com, bpf@vger.kernel.org, netdev@vger.kernel.org, linux-kselftest@vger.kernel.org, Gilad Sever Subject: [PATCH bpf,v4 3/4] bpf: fix bpf socket lookup from tc/xdp to respect socket VRF bindings Date: Fri, 28 Apr 2023 11:30:06 +0300 Message-Id: <20230428083007.148364-4-gilad9366@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230428083007.148364-1-gilad9366@gmail.com> References: <20230428083007.148364-1-gilad9366@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net When calling bpf_sk_lookup_tcp(), bpf_sk_lookup_udp() or bpf_skc_lookup_tcp() from tc/xdp ingress, VRF socket bindings aren't respoected, i.e. unbound sockets are returned, and bound sockets aren't found. VRF binding is determined by the sdif argument to sk_lookup(), however when called from tc the IP SKB control block isn't initialized and thus inet{,6}_sdif() always returns 0. Fix by calculating sdif for the tc/xdp flows by observing the device's l3 enslaved state. The cg/sk_skb hooking points which are expected to support inet{,6}_sdif() pass sdif=-1 which makes __bpf_skc_lookup() use the existing logic. Fixes: 6acc9b432e67 ("bpf: Add helper to retrieve socket in BPF") Acked-by: Stanislav Fomichev Reviewed-by: Shmulik Ladkani Reviewed-by: Eyal Birger Signed-off-by: Gilad Sever --- v4: Move dev_sdif() to include/linux/netdevice.h as suggested by Stanislav Fomichev v3: Rename bpf_l2_sdif() to dev_sdif() as suggested by Stanislav Fomichev --- include/linux/netdevice.h | 9 +++++++ net/core/filter.c | 54 ++++++++++++++++++++++++--------------- 2 files changed, 42 insertions(+), 21 deletions(-) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 08fbd4622ccf..b40c3825dd3b 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -5090,6 +5090,15 @@ static inline bool netif_is_l3_slave(const struct net_device *dev) return dev->priv_flags & IFF_L3MDEV_SLAVE; } +static inline int dev_sdif(const struct net_device *dev) +{ +#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV) + if (netif_is_l3_slave(dev)) + return dev->ifindex; +#endif + return 0; +} + static inline bool netif_is_bridge_master(const struct net_device *dev) { return dev->priv_flags & IFF_EBRIDGE; diff --git a/net/core/filter.c b/net/core/filter.c index e06547922edc..3249036e8f27 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -6555,12 +6555,11 @@ static struct sock *sk_lookup(struct net *net, struct bpf_sock_tuple *tuple, static struct sock * __bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id, - u64 flags) + u64 flags, int sdif) { struct sock *sk = NULL; struct net *net; u8 family; - int sdif; if (len == sizeof(tuple->ipv4)) family = AF_INET; @@ -6572,10 +6571,12 @@ __bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, if (unlikely(flags || !((s32)netns_id < 0 || netns_id <= S32_MAX))) goto out; - if (family == AF_INET) - sdif = inet_sdif(skb); - else - sdif = inet6_sdif(skb); + if (sdif < 0) { + if (family == AF_INET) + sdif = inet_sdif(skb); + else + sdif = inet6_sdif(skb); + } if ((s32)netns_id < 0) { net = caller_net; @@ -6595,10 +6596,11 @@ __bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, static struct sock * __bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id, - u64 flags) + u64 flags, int sdif) { struct sock *sk = __bpf_skc_lookup(skb, tuple, len, caller_net, - ifindex, proto, netns_id, flags); + ifindex, proto, netns_id, flags, + sdif); if (sk) { struct sock *sk2 = sk_to_full_sk(sk); @@ -6638,7 +6640,7 @@ bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len, } return __bpf_skc_lookup(skb, tuple, len, caller_net, ifindex, proto, - netns_id, flags); + netns_id, flags, -1); } static struct sock * @@ -6731,11 +6733,12 @@ BPF_CALL_5(bpf_tc_skc_lookup_tcp, struct sk_buff *, skb, struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) { struct net *caller_net = dev_net(skb->dev); + int sdif = dev_sdif(skb->dev); int ifindex = skb->dev->ifindex; return (unsigned long)__bpf_skc_lookup(skb, tuple, len, caller_net, ifindex, IPPROTO_TCP, netns_id, - flags); + flags, sdif); } static const struct bpf_func_proto bpf_tc_skc_lookup_tcp_proto = { @@ -6754,11 +6757,12 @@ BPF_CALL_5(bpf_tc_sk_lookup_tcp, struct sk_buff *, skb, struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) { struct net *caller_net = dev_net(skb->dev); + int sdif = dev_sdif(skb->dev); int ifindex = skb->dev->ifindex; return (unsigned long)__bpf_sk_lookup(skb, tuple, len, caller_net, ifindex, IPPROTO_TCP, netns_id, - flags); + flags, sdif); } static const struct bpf_func_proto bpf_tc_sk_lookup_tcp_proto = { @@ -6777,11 +6781,12 @@ BPF_CALL_5(bpf_tc_sk_lookup_udp, struct sk_buff *, skb, struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags) { struct net *caller_net = dev_net(skb->dev); + int sdif = dev_sdif(skb->dev); int ifindex = skb->dev->ifindex; return (unsigned long)__bpf_sk_lookup(skb, tuple, len, caller_net, ifindex, IPPROTO_UDP, netns_id, - flags); + flags, sdif); } static const struct bpf_func_proto bpf_tc_sk_lookup_udp_proto = { @@ -6814,11 +6819,13 @@ BPF_CALL_5(bpf_xdp_sk_lookup_udp, struct xdp_buff *, ctx, struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) { struct net *caller_net = dev_net(ctx->rxq->dev); - int ifindex = ctx->rxq->dev->ifindex; + struct net_device *dev = ctx->rxq->dev; + int sdif = dev_sdif(dev); + int ifindex = dev->ifindex; return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, caller_net, ifindex, IPPROTO_UDP, netns_id, - flags); + flags, sdif); } static const struct bpf_func_proto bpf_xdp_sk_lookup_udp_proto = { @@ -6837,11 +6844,13 @@ BPF_CALL_5(bpf_xdp_skc_lookup_tcp, struct xdp_buff *, ctx, struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) { struct net *caller_net = dev_net(ctx->rxq->dev); - int ifindex = ctx->rxq->dev->ifindex; + struct net_device *dev = ctx->rxq->dev; + int sdif = dev_sdif(dev); + int ifindex = dev->ifindex; return (unsigned long)__bpf_skc_lookup(NULL, tuple, len, caller_net, ifindex, IPPROTO_TCP, netns_id, - flags); + flags, sdif); } static const struct bpf_func_proto bpf_xdp_skc_lookup_tcp_proto = { @@ -6860,11 +6869,13 @@ BPF_CALL_5(bpf_xdp_sk_lookup_tcp, struct xdp_buff *, ctx, struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags) { struct net *caller_net = dev_net(ctx->rxq->dev); - int ifindex = ctx->rxq->dev->ifindex; + struct net_device *dev = ctx->rxq->dev; + int sdif = dev_sdif(dev); + int ifindex = dev->ifindex; return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, caller_net, ifindex, IPPROTO_TCP, netns_id, - flags); + flags, sdif); } static const struct bpf_func_proto bpf_xdp_sk_lookup_tcp_proto = { @@ -6884,7 +6895,8 @@ BPF_CALL_5(bpf_sock_addr_skc_lookup_tcp, struct bpf_sock_addr_kern *, ctx, { return (unsigned long)__bpf_skc_lookup(NULL, tuple, len, sock_net(ctx->sk), 0, - IPPROTO_TCP, netns_id, flags); + IPPROTO_TCP, netns_id, flags, + -1); } static const struct bpf_func_proto bpf_sock_addr_skc_lookup_tcp_proto = { @@ -6903,7 +6915,7 @@ BPF_CALL_5(bpf_sock_addr_sk_lookup_tcp, struct bpf_sock_addr_kern *, ctx, { return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, sock_net(ctx->sk), 0, IPPROTO_TCP, - netns_id, flags); + netns_id, flags, -1); } static const struct bpf_func_proto bpf_sock_addr_sk_lookup_tcp_proto = { @@ -6922,7 +6934,7 @@ BPF_CALL_5(bpf_sock_addr_sk_lookup_udp, struct bpf_sock_addr_kern *, ctx, { return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, sock_net(ctx->sk), 0, IPPROTO_UDP, - netns_id, flags); + netns_id, flags, -1); } static const struct bpf_func_proto bpf_sock_addr_sk_lookup_udp_proto = {