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=-7.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, UNWANTED_LANGUAGE_BODY,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 77AABC433E0 for ; Thu, 2 Jul 2020 09:25:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 588DE20771 for ; Thu, 2 Jul 2020 09:25:02 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=cloudflare.com header.i=@cloudflare.com header.b="FvFfqykV" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728375AbgGBJZA (ORCPT ); Thu, 2 Jul 2020 05:25:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56498 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728291AbgGBJYh (ORCPT ); Thu, 2 Jul 2020 05:24:37 -0400 Received: from mail-ed1-x543.google.com (mail-ed1-x543.google.com [IPv6:2a00:1450:4864:20::543]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7FCB3C08C5DF for ; Thu, 2 Jul 2020 02:24:37 -0700 (PDT) Received: by mail-ed1-x543.google.com with SMTP id b15so22878642edy.7 for ; Thu, 02 Jul 2020 02:24:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cloudflare.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=9asR5sh01iXalcrdSEirJj/xH3WCxxvJXMDr+dr/BJY=; b=FvFfqykVjxnJw2qodna3avrWjEbaEAUcXWt9/yMLTfF1WfmCGEHINl0GDe4Xx5ivGL q63gza88UE3qwQFDoql5lviGUnyC1uKQ1kNKL6m2zkY4fUWVvcDbnbJyQ7qbeuNsE4q5 K9TSXSvsZ++96w3/EhTqcMo+NFHfVkrR43b7s= 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=9asR5sh01iXalcrdSEirJj/xH3WCxxvJXMDr+dr/BJY=; b=FZLgxuSbvCKsGfxzhUQC+0I2r1gK+rSmuRc7h22SKyxrlRhqrl/jcdygdMhrQiffJj kxklurKWwhK6x2bS/IQAUOsdQSw4sK3Le6GjvzVtqgJIt5K9lskTsg4tnbgtfRFR9EKm erf8xO+6yAbY1lvRGmyIsxxy+BUqUAbza2DfzkMntKgZJceg5VASEa22RHXsdXm55Ej/ arqkeiMMnOYcYe1DirC8vkGml9MYVCZNFCJSUjrzXZPvoUGXWUQO6KLRDEFVMoJulWqy KvRSyJ2RJMSdUOq2JscjdPryUYbfjZvThQ7yYIhbPzp1KeIItL2AEv8Hn2I3Qh2te1vx fYgA== X-Gm-Message-State: AOAM5303cHCIrjpxo2NhlyqzTcHRxzK88X0baoUCNnzggNK/sqLwEBeN ypoqkCXkzNcMJztClcWzcYbhFgG7KiwvTw== X-Google-Smtp-Source: ABdhPJyjeDrkm82FQWpsUXquzibnqK8TehHY2J+iKUTdqZ6/YwdUDbonRPA3eEVex7S0vc4duAyOpQ== X-Received: by 2002:a05:6402:1c0f:: with SMTP id ck15mr32256320edb.155.1593681876204; Thu, 02 Jul 2020 02:24:36 -0700 (PDT) Received: from cloudflare.com ([2a02:a310:c262:aa00:b35e:8938:2c2a:ba8b]) by smtp.gmail.com with ESMTPSA id e8sm6341467eja.101.2020.07.02.02.24.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 02 Jul 2020 02:24:35 -0700 (PDT) From: Jakub Sitnicki To: bpf@vger.kernel.org Cc: netdev@vger.kernel.org, kernel-team@cloudflare.com, Alexei Starovoitov , Daniel Borkmann , "David S. Miller" , Jakub Kicinski , Marek Majkowski Subject: [PATCH bpf-next v3 10/16] udp6: Run SK_LOOKUP BPF program on socket lookup Date: Thu, 2 Jul 2020 11:24:10 +0200 Message-Id: <20200702092416.11961-11-jakub@cloudflare.com> X-Mailer: git-send-email 2.25.4 In-Reply-To: <20200702092416.11961-1-jakub@cloudflare.com> References: <20200702092416.11961-1-jakub@cloudflare.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Same as for udp4, let BPF program override the socket lookup result, by selecting a receiving socket of its choice or failing the lookup, if no connected UDP socket matched packet 4-tuple. Suggested-by: Marek Majkowski Signed-off-by: Jakub Sitnicki --- Notes: v3: - Use a static_key to minimize the hook overhead when not used. (Alexei) - Adapt for running an array of attached programs. (Alexei) - Adapt for optionally skipping reuseport selection. (Martin) net/ipv6/udp.c | 60 ++++++++++++++++++++++++++++++++++++++++++-------- 1 file changed, 51 insertions(+), 9 deletions(-) diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c index 65b843e7acde..c4338cfe7a8c 100644 --- a/net/ipv6/udp.c +++ b/net/ipv6/udp.c @@ -190,6 +190,31 @@ static struct sock *udp6_lib_lookup2(struct net *net, return result; } +static inline struct sock *udp6_lookup_run_bpf(struct net *net, + struct udp_table *udptable, + struct sk_buff *skb, + const struct in6_addr *saddr, + __be16 sport, + const struct in6_addr *daddr, + u16 hnum) +{ + struct sock *sk, *reuse_sk; + bool do_reuseport; + + if (udptable != &udp_table) + return NULL; /* only UDP is supported */ + + do_reuseport = bpf_sk_lookup_run_v6(net, IPPROTO_UDP, + saddr, sport, daddr, hnum, &sk); + if (do_reuseport) { + reuse_sk = lookup_reuseport(net, sk, skb, + saddr, sport, daddr, hnum); + if (reuse_sk) + sk = reuse_sk; + } + return sk; +} + /* rcu_read_lock() must be held */ struct sock *__udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, @@ -200,25 +225,42 @@ struct sock *__udp6_lib_lookup(struct net *net, unsigned short hnum = ntohs(dport); unsigned int hash2, slot2; struct udp_hslot *hslot2; - struct sock *result; + struct sock *result, *sk; hash2 = ipv6_portaddr_hash(net, daddr, hnum); slot2 = hash2 & udptable->mask; hslot2 = &udptable->hash2[slot2]; + /* Lookup connected or non-wildcard sockets */ result = udp6_lib_lookup2(net, saddr, sport, daddr, hnum, dif, sdif, hslot2, skb); - if (!result) { - hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum); - slot2 = hash2 & udptable->mask; + if (!IS_ERR_OR_NULL(result) && result->sk_state == TCP_ESTABLISHED) + goto done; + + /* Lookup redirect from BPF */ + if (static_branch_unlikely(&bpf_sk_lookup_enabled)) { + sk = udp6_lookup_run_bpf(net, udptable, skb, + saddr, sport, daddr, hnum); + if (sk) { + result = sk; + goto done; + } + } - hslot2 = &udptable->hash2[slot2]; + /* Got non-wildcard socket or error on first lookup */ + if (result) + goto done; - result = udp6_lib_lookup2(net, saddr, sport, - &in6addr_any, hnum, dif, sdif, - hslot2, skb); - } + /* Lookup wildcard sockets */ + hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum); + slot2 = hash2 & udptable->mask; + hslot2 = &udptable->hash2[slot2]; + + result = udp6_lib_lookup2(net, saddr, sport, + &in6addr_any, hnum, dif, sdif, + hslot2, skb); +done: if (IS_ERR(result)) return NULL; return result; -- 2.25.4