From patchwork Mon Jul 20 12:47:30 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11673703 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7A78E1392 for ; Mon, 20 Jul 2020 12:48:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 62E5722C9D for ; Mon, 20 Jul 2020 12:48:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="Q2M2BbM8" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729170AbgGTMso (ORCPT ); Mon, 20 Jul 2020 08:48:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40604 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728779AbgGTMsm (ORCPT ); Mon, 20 Jul 2020 08:48:42 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A6C4DC061794; Mon, 20 Jul 2020 05:48:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=oYVq7NIRWqvX/f/cel/N+xePG7N1PJ2B3QTLRfoiAMQ=; b=Q2M2BbM8skgQsbz+9IFT9+SRS8 wOn0jWnTATVFcYirebkCBwKq5mT6Ub4JpyN3kocyPSwcZ9qxddqTIFOBWgt5cHn7Fiaq/A/rTr1Ny NJlv7iQ0FqlWOI2nLC8g9bDpVaGGUDRAPFvWzldUjdv+qtqUMGw9bRqAhBQHXLOTF8PBI5+b8YJ0f lSUkjWJUoqeS7o7xpPt8jkfJjaD/qpK37PcCQGm6fR3w9Ve3Av+OXeSmQz1Fcz1KSaLMTuFeT0L3h aoUfH/3lOromCbJGjPXv7nZzZc+/eTbity/L2HIf00Ca7AS8k5/AiW+/D9KsSdwaT+vKgWaf2mC9R XUUDuXUg==; Received: from [2001:4bb8:105:4a81:2a8f:15b1:2c3:7be7] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1jxVDW-0004bj-37; Mon, 20 Jul 2020 12:48:27 +0000 From: Christoph Hellwig To: "David S. Miller" , Jakub Kicinski , Alexei Starovoitov , Daniel Borkmann , Alexey Kuznetsov , Hideaki YOSHIFUJI , Eric Dumazet Cc: linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, bpf@vger.kernel.org, netfilter-devel@vger.kernel.org, coreteam@netfilter.org, linux-sctp@vger.kernel.org, linux-hams@vger.kernel.org, linux-bluetooth@vger.kernel.org, bridge@lists.linux-foundation.org, linux-can@vger.kernel.org, dccp@vger.kernel.org, linux-decnet-user@lists.sourceforge.net, linux-wpan@vger.kernel.org, linux-s390@vger.kernel.org, mptcp@lists.01.org, lvs-devel@vger.kernel.org, rds-devel@oss.oracle.com, linux-afs@lists.infradead.org, tipc-discussion@lists.sourceforge.net, linux-x25@vger.kernel.org Subject: [PATCH 17/24] net/ipv6: split up ipv6_flowlabel_opt Date: Mon, 20 Jul 2020 14:47:30 +0200 Message-Id: <20200720124737.118617-18-hch@lst.de> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200720124737.118617-1-hch@lst.de> References: <20200720124737.118617-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-wpan-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wpan@vger.kernel.org Split ipv6_flowlabel_opt into a subfunction for each action and a small wrapper. Signed-off-by: Christoph Hellwig --- net/ipv6/ip6_flowlabel.c | 311 +++++++++++++++++++++------------------ 1 file changed, 167 insertions(+), 144 deletions(-) diff --git a/net/ipv6/ip6_flowlabel.c b/net/ipv6/ip6_flowlabel.c index ce4fbba4acce7e..27ee6de9beffc4 100644 --- a/net/ipv6/ip6_flowlabel.c +++ b/net/ipv6/ip6_flowlabel.c @@ -533,187 +533,210 @@ int ipv6_flowlabel_opt_get(struct sock *sk, struct in6_flowlabel_req *freq, return -ENOENT; } -int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen) +#define socklist_dereference(__sflp) \ + rcu_dereference_protected(__sflp, lockdep_is_held(&ip6_sk_fl_lock)) + +static int ipv6_flowlabel_put(struct sock *sk, struct in6_flowlabel_req *freq) { - int uninitialized_var(err); - struct net *net = sock_net(sk); struct ipv6_pinfo *np = inet6_sk(sk); - struct in6_flowlabel_req freq; - struct ipv6_fl_socklist *sfl1 = NULL; - struct ipv6_fl_socklist *sfl; struct ipv6_fl_socklist __rcu **sflp; - struct ip6_flowlabel *fl, *fl1 = NULL; - + struct ipv6_fl_socklist *sfl; - if (optlen < sizeof(freq)) - return -EINVAL; + if (freq->flr_flags & IPV6_FL_F_REFLECT) { + if (sk->sk_protocol != IPPROTO_TCP) + return -ENOPROTOOPT; + if (!np->repflow) + return -ESRCH; + np->flow_label = 0; + np->repflow = 0; + return 0; + } - if (copy_from_user(&freq, optval, sizeof(freq))) - return -EFAULT; + spin_lock_bh(&ip6_sk_fl_lock); + for (sflp = &np->ipv6_fl_list; + (sfl = socklist_dereference(*sflp)) != NULL; + sflp = &sfl->next) { + if (sfl->fl->label == freq->flr_label) + goto found; + } + spin_unlock_bh(&ip6_sk_fl_lock); + return -ESRCH; +found: + if (freq->flr_label == (np->flow_label & IPV6_FLOWLABEL_MASK)) + np->flow_label &= ~IPV6_FLOWLABEL_MASK; + *sflp = sfl->next; + spin_unlock_bh(&ip6_sk_fl_lock); + fl_release(sfl->fl); + kfree_rcu(sfl, rcu); + return 0; +} + +static int ipv6_flowlabel_renew(struct sock *sk, struct in6_flowlabel_req *freq) +{ + struct ipv6_pinfo *np = inet6_sk(sk); + struct net *net = sock_net(sk); + struct ipv6_fl_socklist *sfl; + int err; - switch (freq.flr_action) { - case IPV6_FL_A_PUT: - if (freq.flr_flags & IPV6_FL_F_REFLECT) { - if (sk->sk_protocol != IPPROTO_TCP) - return -ENOPROTOOPT; - if (!np->repflow) - return -ESRCH; - np->flow_label = 0; - np->repflow = 0; - return 0; - } - spin_lock_bh(&ip6_sk_fl_lock); - for (sflp = &np->ipv6_fl_list; - (sfl = rcu_dereference_protected(*sflp, - lockdep_is_held(&ip6_sk_fl_lock))) != NULL; - sflp = &sfl->next) { - if (sfl->fl->label == freq.flr_label) { - if (freq.flr_label == (np->flow_label&IPV6_FLOWLABEL_MASK)) - np->flow_label &= ~IPV6_FLOWLABEL_MASK; - *sflp = sfl->next; - spin_unlock_bh(&ip6_sk_fl_lock); - fl_release(sfl->fl); - kfree_rcu(sfl, rcu); - return 0; - } + rcu_read_lock_bh(); + for_each_sk_fl_rcu(np, sfl) { + if (sfl->fl->label == freq->flr_label) { + err = fl6_renew(sfl->fl, freq->flr_linger, + freq->flr_expires); + rcu_read_unlock_bh(); + return err; } - spin_unlock_bh(&ip6_sk_fl_lock); - return -ESRCH; + } + rcu_read_unlock_bh(); - case IPV6_FL_A_RENEW: - rcu_read_lock_bh(); - for_each_sk_fl_rcu(np, sfl) { - if (sfl->fl->label == freq.flr_label) { - err = fl6_renew(sfl->fl, freq.flr_linger, freq.flr_expires); - rcu_read_unlock_bh(); - return err; - } - } - rcu_read_unlock_bh(); + if (freq->flr_share == IPV6_FL_S_NONE && + ns_capable(net->user_ns, CAP_NET_ADMIN)) { + struct ip6_flowlabel *fl = fl_lookup(net, freq->flr_label); - if (freq.flr_share == IPV6_FL_S_NONE && - ns_capable(net->user_ns, CAP_NET_ADMIN)) { - fl = fl_lookup(net, freq.flr_label); - if (fl) { - err = fl6_renew(fl, freq.flr_linger, freq.flr_expires); - fl_release(fl); - return err; - } + if (fl) { + err = fl6_renew(fl, freq->flr_linger, + freq->flr_expires); + fl_release(fl); + return err; } - return -ESRCH; - - case IPV6_FL_A_GET: - if (freq.flr_flags & IPV6_FL_F_REFLECT) { - struct net *net = sock_net(sk); - if (net->ipv6.sysctl.flowlabel_consistency) { - net_info_ratelimited("Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable\n"); - return -EPERM; - } + } + return -ESRCH; +} - if (sk->sk_protocol != IPPROTO_TCP) - return -ENOPROTOOPT; +static int ipv6_flowlabel_get(struct sock *sk, struct in6_flowlabel_req *freq, + void __user *optval, int optlen) +{ + struct ipv6_fl_socklist *sfl, *sfl1 = NULL; + struct ip6_flowlabel *fl, *fl1 = NULL; + struct ipv6_pinfo *np = inet6_sk(sk); + struct net *net = sock_net(sk); + int uninitialized_var(err); - np->repflow = 1; - return 0; + if (freq->flr_flags & IPV6_FL_F_REFLECT) { + if (net->ipv6.sysctl.flowlabel_consistency) { + net_info_ratelimited("Can not set IPV6_FL_F_REFLECT if flowlabel_consistency sysctl is enable\n"); + return -EPERM; } - if (freq.flr_label & ~IPV6_FLOWLABEL_MASK) - return -EINVAL; + if (sk->sk_protocol != IPPROTO_TCP) + return -ENOPROTOOPT; + np->repflow = 1; + return 0; + } - if (net->ipv6.sysctl.flowlabel_state_ranges && - (freq.flr_label & IPV6_FLOWLABEL_STATELESS_FLAG)) - return -ERANGE; + if (freq->flr_label & ~IPV6_FLOWLABEL_MASK) + return -EINVAL; + if (net->ipv6.sysctl.flowlabel_state_ranges && + (freq->flr_label & IPV6_FLOWLABEL_STATELESS_FLAG)) + return -ERANGE; - fl = fl_create(net, sk, &freq, optval, optlen, &err); - if (!fl) - return err; - sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL); + fl = fl_create(net, sk, freq, optval, optlen, &err); + if (!fl) + return err; - if (freq.flr_label) { - err = -EEXIST; - rcu_read_lock_bh(); - for_each_sk_fl_rcu(np, sfl) { - if (sfl->fl->label == freq.flr_label) { - if (freq.flr_flags&IPV6_FL_F_EXCL) { - rcu_read_unlock_bh(); - goto done; - } - fl1 = sfl->fl; - if (!atomic_inc_not_zero(&fl1->users)) - fl1 = NULL; - break; + sfl1 = kmalloc(sizeof(*sfl1), GFP_KERNEL); + + if (freq->flr_label) { + err = -EEXIST; + rcu_read_lock_bh(); + for_each_sk_fl_rcu(np, sfl) { + if (sfl->fl->label == freq->flr_label) { + if (freq->flr_flags & IPV6_FL_F_EXCL) { + rcu_read_unlock_bh(); + goto done; } + fl1 = sfl->fl; + if (!atomic_inc_not_zero(&fl1->users)) + fl1 = NULL; + break; } - rcu_read_unlock_bh(); + } + rcu_read_unlock_bh(); - if (!fl1) - fl1 = fl_lookup(net, freq.flr_label); - if (fl1) { + if (!fl1) + fl1 = fl_lookup(net, freq->flr_label); + if (fl1) { recheck: - err = -EEXIST; - if (freq.flr_flags&IPV6_FL_F_EXCL) - goto release; - err = -EPERM; - if (fl1->share == IPV6_FL_S_EXCL || - fl1->share != fl->share || - ((fl1->share == IPV6_FL_S_PROCESS) && - (fl1->owner.pid != fl->owner.pid)) || - ((fl1->share == IPV6_FL_S_USER) && - !uid_eq(fl1->owner.uid, fl->owner.uid))) - goto release; - - err = -ENOMEM; - if (!sfl1) - goto release; - if (fl->linger > fl1->linger) - fl1->linger = fl->linger; - if ((long)(fl->expires - fl1->expires) > 0) - fl1->expires = fl->expires; - fl_link(np, sfl1, fl1); - fl_free(fl); - return 0; + err = -EEXIST; + if (freq->flr_flags&IPV6_FL_F_EXCL) + goto release; + err = -EPERM; + if (fl1->share == IPV6_FL_S_EXCL || + fl1->share != fl->share || + ((fl1->share == IPV6_FL_S_PROCESS) && + (fl1->owner.pid != fl->owner.pid)) || + ((fl1->share == IPV6_FL_S_USER) && + !uid_eq(fl1->owner.uid, fl->owner.uid))) + goto release; + + err = -ENOMEM; + if (!sfl1) + goto release; + if (fl->linger > fl1->linger) + fl1->linger = fl->linger; + if ((long)(fl->expires - fl1->expires) > 0) + fl1->expires = fl->expires; + fl_link(np, sfl1, fl1); + fl_free(fl); + return 0; release: - fl_release(fl1); - goto done; - } - } - err = -ENOENT; - if (!(freq.flr_flags&IPV6_FL_F_CREATE)) + fl_release(fl1); goto done; + } + } + err = -ENOENT; + if (!(freq->flr_flags & IPV6_FL_F_CREATE)) + goto done; - err = -ENOMEM; - if (!sfl1) - goto done; + err = -ENOMEM; + if (!sfl1) + goto done; - err = mem_check(sk); - if (err != 0) - goto done; + err = mem_check(sk); + if (err != 0) + goto done; - fl1 = fl_intern(net, fl, freq.flr_label); - if (fl1) - goto recheck; + fl1 = fl_intern(net, fl, freq->flr_label); + if (fl1) + goto recheck; - if (!freq.flr_label) { - if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label, - &fl->label, sizeof(fl->label))) { - /* Intentionally ignore fault. */ - } + if (!freq->flr_label) { + if (copy_to_user(&((struct in6_flowlabel_req __user *) optval)->flr_label, + &fl->label, sizeof(fl->label))) { + /* Intentionally ignore fault. */ } - - fl_link(np, sfl1, fl); - return 0; - - default: - return -EINVAL; } + fl_link(np, sfl1, fl); + return 0; done: fl_free(fl); kfree(sfl1); return err; } +int ipv6_flowlabel_opt(struct sock *sk, char __user *optval, int optlen) +{ + struct in6_flowlabel_req freq; + + if (optlen < sizeof(freq)) + return -EINVAL; + if (copy_from_user(&freq, optval, sizeof(freq))) + return -EFAULT; + + switch (freq.flr_action) { + case IPV6_FL_A_PUT: + return ipv6_flowlabel_put(sk, &freq); + case IPV6_FL_A_RENEW: + return ipv6_flowlabel_renew(sk, &freq); + case IPV6_FL_A_GET: + return ipv6_flowlabel_get(sk, &freq, optval, optlen); + default: + return -EINVAL; + } +} + #ifdef CONFIG_PROC_FS struct ip6fl_iter_state {