From patchwork Wed Dec 20 17:35:12 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Aring X-Patchwork-Id: 851566 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=mojatatu-com.20150623.gappssmtp.com header.i=@mojatatu-com.20150623.gappssmtp.com header.b="cn/OaCNX"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3z22472gmrz9s72 for ; Thu, 21 Dec 2017 04:35:51 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755882AbdLTRfr (ORCPT ); Wed, 20 Dec 2017 12:35:47 -0500 Received: from mail-it0-f66.google.com ([209.85.214.66]:39962 "EHLO mail-it0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755804AbdLTRfl (ORCPT ); Wed, 20 Dec 2017 12:35:41 -0500 Received: by mail-it0-f66.google.com with SMTP id f190so7710365ita.5 for ; Wed, 20 Dec 2017 09:35:41 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mojatatu-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=/rG8T9UQrTtFIhEt7Ihtk/QwjLPF26PPBBr+U5np5RA=; b=cn/OaCNXM52GFObV2TFIphI3Ap4IOrlgjO/FwCKyG0JKWgK94lXM2dD1RVNuC58oEp O3wNBNNZECro7A81PfJyUuXjNpjvt0F7S2lsmMwZJRzBnpZdye92QOOCv8CJiJQnwp+E iQrx8kd4GQBmJ/7Zn19StuqaEub9tatnsiWCxXi3IWSJYGZEKU2ZzY4nH+Ce/+L5dQzQ 7mZRgconjcpCIOaUh0GIGbeRdPILDzo/06lHu0gBT1DROW5eIq82rndDWqCa/JdTh9Bp 5UKx+gI/r7czFGZVAAGfoZogxJmLwBjM46CHWxNq02+xUkIScqaXGJPb2UeusiWhNJbc yFjw== 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; bh=/rG8T9UQrTtFIhEt7Ihtk/QwjLPF26PPBBr+U5np5RA=; b=kpbjQETlhsRKjWtc5o1REmGoaztEUCLi8HrAwn3gz2v7br42PeATR66Tb6kGVEGtZu DR20jNRGQnPHvq5E7HUMMUn3Bf208UAD+rrP5YKDWnI5nH6NqDEZYC3iRClkatmVKGnf 4HuGmcybCaQ++s/0iJIkM/1TpMcAiOmnMPeb6RcauDxnZ3/K0DneEgkACQ18qYdiGzcn IkepKcCF73fczkSxNiVdR9fpQDKSZlAwowZX/RBiYnfDWg4+VbX+mclopo6V+YKhD+2P r5X0w/ybgs9/kk8V8sxfwzprUy/jTOWJr/wnHt8HBuEljULWq0zxqjB7OwRAG89kfxME psgQ== X-Gm-Message-State: AKGB3mI7l/f4568D6twfJLW9IZCafI9r1XlHAUae+l99yPi8NmaWvev1 8X9ZbqviBt/JJ/ruo9lJAwZa+A== X-Google-Smtp-Source: ACJfBovaXGSwnXZnSatON0kRR9ElzQ2VnCqW/pZj94kaWFSVN0XHGP+5sRMHaSzal037QklHgLsvxw== X-Received: by 10.36.34.12 with SMTP id o12mr8847992ito.115.1513791340574; Wed, 20 Dec 2017 09:35:40 -0800 (PST) Received: from x220t.lan ([64.26.149.125]) by smtp.gmail.com with ESMTPSA id w75sm9687740iod.66.2017.12.20.09.35.39 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 20 Dec 2017 09:35:40 -0800 (PST) From: Alexander Aring To: jhs@mojatatu.com Cc: xiyou.wangcong@gmail.com, jiri@resnulli.us, davem@davemloft.net, netdev@vger.kernel.org, kernel@mojatatu.com, Alexander Aring , David Ahern Subject: [PATCHv4 net-next 02/14] net: sched: sch_api: handle generic qdisc errors Date: Wed, 20 Dec 2017 12:35:12 -0500 Message-Id: <20171220173524.25874-3-aring@mojatatu.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20171220173524.25874-1-aring@mojatatu.com> References: <20171220173524.25874-1-aring@mojatatu.com> Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This patch adds extack support for generic qdisc handling. The extack will be set deeper to each called function which is not part of netdev core api. Cc: David Ahern Acked-by: Jamal Hadi Salim Signed-off-by: Alexander Aring --- net/sched/sch_api.c | 148 +++++++++++++++++++++++++++++++++++++--------------- 1 file changed, 105 insertions(+), 43 deletions(-) diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c index 96a5e5d9378e..954c0fc45473 100644 --- a/net/sched/sch_api.c +++ b/net/sched/sch_api.c @@ -449,7 +449,8 @@ static const struct nla_policy stab_policy[TCA_STAB_MAX + 1] = { [TCA_STAB_DATA] = { .type = NLA_BINARY }, }; -static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt) +static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt, + struct netlink_ext_ack *extack) { struct nlattr *tb[TCA_STAB_MAX + 1]; struct qdisc_size_table *stab; @@ -458,23 +459,29 @@ static struct qdisc_size_table *qdisc_get_stab(struct nlattr *opt) u16 *tab = NULL; int err; - err = nla_parse_nested(tb, TCA_STAB_MAX, opt, stab_policy, NULL); + err = nla_parse_nested(tb, TCA_STAB_MAX, opt, stab_policy, extack); if (err < 0) return ERR_PTR(err); - if (!tb[TCA_STAB_BASE]) + if (!tb[TCA_STAB_BASE]) { + NL_SET_ERR_MSG(extack, "Size table base attribute is missing"); return ERR_PTR(-EINVAL); + } s = nla_data(tb[TCA_STAB_BASE]); if (s->tsize > 0) { - if (!tb[TCA_STAB_DATA]) + if (!tb[TCA_STAB_DATA]) { + NL_SET_ERR_MSG(extack, "Size table data attribute is missing"); return ERR_PTR(-EINVAL); + } tab = nla_data(tb[TCA_STAB_DATA]); tsize = nla_len(tb[TCA_STAB_DATA]) / sizeof(u16); } - if (tsize != s->tsize || (!tab && tsize > 0)) + if (tsize != s->tsize || (!tab && tsize > 0)) { + NL_SET_ERR_MSG(extack, "Invalid size of size table"); return ERR_PTR(-EINVAL); + } list_for_each_entry(stab, &qdisc_stab_list, list) { if (memcmp(&stab->szopts, s, sizeof(*s))) @@ -899,7 +906,8 @@ static void notify_and_destroy(struct net *net, struct sk_buff *skb, static int qdisc_graft(struct net_device *dev, struct Qdisc *parent, struct sk_buff *skb, struct nlmsghdr *n, u32 classid, - struct Qdisc *new, struct Qdisc *old) + struct Qdisc *new, struct Qdisc *old, + struct netlink_ext_ack *extack) { struct Qdisc *q = old; struct net *net = dev_net(dev); @@ -914,8 +922,10 @@ static int qdisc_graft(struct net_device *dev, struct Qdisc *parent, (new && new->flags & TCQ_F_INGRESS)) { num_q = 1; ingress = 1; - if (!dev_ingress_queue(dev)) + if (!dev_ingress_queue(dev)) { + NL_SET_ERR_MSG(extack, "Device does not have an ingress queue"); return -ENOENT; + } } if (dev->flags & IFF_UP) @@ -966,10 +976,12 @@ static int qdisc_graft(struct net_device *dev, struct Qdisc *parent, if (cops && cops->graft) { unsigned long cl = cops->find(parent, classid); - if (cl) + if (cl) { err = cops->graft(parent, cl, new, &old); - else + } else { + NL_SET_ERR_MSG(extack, "Specified class not found"); err = -ENOENT; + } } if (!err) notify_and_destroy(net, skb, n, classid, old, new); @@ -990,7 +1002,8 @@ static struct lock_class_key qdisc_rx_lock; static struct Qdisc *qdisc_create(struct net_device *dev, struct netdev_queue *dev_queue, struct Qdisc *p, u32 parent, u32 handle, - struct nlattr **tca, int *errp) + struct nlattr **tca, int *errp, + struct netlink_ext_ack *extack) { int err; struct nlattr *kind = tca[TCA_KIND]; @@ -1028,8 +1041,10 @@ static struct Qdisc *qdisc_create(struct net_device *dev, #endif err = -ENOENT; - if (!ops) + if (!ops) { + NL_SET_ERR_MSG(extack, "Specified qdisc not found"); goto err_out; + } sch = qdisc_alloc(dev_queue, ops); if (IS_ERR(sch)) { @@ -1086,7 +1101,7 @@ static struct Qdisc *qdisc_create(struct net_device *dev, } if (tca[TCA_STAB]) { - stab = qdisc_get_stab(tca[TCA_STAB]); + stab = qdisc_get_stab(tca[TCA_STAB], extack); if (IS_ERR(stab)) { err = PTR_ERR(stab); goto err_out4; @@ -1097,8 +1112,10 @@ static struct Qdisc *qdisc_create(struct net_device *dev, seqcount_t *running; err = -EOPNOTSUPP; - if (sch->flags & TCQ_F_MQROOT) + if (sch->flags & TCQ_F_MQROOT) { + NL_SET_ERR_MSG(extack, "Cannot attach rate estimator to a multi-queue root qdisc"); goto err_out4; + } if (sch->parent != TC_H_ROOT && !(sch->flags & TCQ_F_INGRESS) && @@ -1113,8 +1130,10 @@ static struct Qdisc *qdisc_create(struct net_device *dev, NULL, running, tca[TCA_RATE]); - if (err) + if (err) { + NL_SET_ERR_MSG(extack, "Failed to generate new estimator"); goto err_out4; + } } qdisc_hash_add(sch, false); @@ -1147,21 +1166,24 @@ static struct Qdisc *qdisc_create(struct net_device *dev, goto err_out3; } -static int qdisc_change(struct Qdisc *sch, struct nlattr **tca) +static int qdisc_change(struct Qdisc *sch, struct nlattr **tca, + struct netlink_ext_ack *extack) { struct qdisc_size_table *ostab, *stab = NULL; int err = 0; if (tca[TCA_OPTIONS]) { - if (!sch->ops->change) + if (!sch->ops->change) { + NL_SET_ERR_MSG(extack, "Change operation not supported by specified qdisc"); return -EINVAL; + } err = sch->ops->change(sch, tca[TCA_OPTIONS]); if (err) return err; } if (tca[TCA_STAB]) { - stab = qdisc_get_stab(tca[TCA_STAB]); + stab = qdisc_get_stab(tca[TCA_STAB], extack); if (IS_ERR(stab)) return PTR_ERR(stab); } @@ -1259,8 +1281,10 @@ static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, if (clid != TC_H_ROOT) { if (TC_H_MAJ(clid) != TC_H_MAJ(TC_H_INGRESS)) { p = qdisc_lookup(dev, TC_H_MAJ(clid)); - if (!p) + if (!p) { + NL_SET_ERR_MSG(extack, "Failed to find qdisc with specified classid"); return -ENOENT; + } q = qdisc_leaf(p, clid); } else if (dev_ingress_queue(dev)) { q = dev_ingress_queue(dev)->qdisc_sleeping; @@ -1268,26 +1292,38 @@ static int tc_get_qdisc(struct sk_buff *skb, struct nlmsghdr *n, } else { q = dev->qdisc; } - if (!q) + if (!q) { + NL_SET_ERR_MSG(extack, "Cannot find specified qdisc on specified device"); return -ENOENT; + } - if (tcm->tcm_handle && q->handle != tcm->tcm_handle) + if (tcm->tcm_handle && q->handle != tcm->tcm_handle) { + NL_SET_ERR_MSG(extack, "Invalid handle"); return -EINVAL; + } } else { q = qdisc_lookup(dev, tcm->tcm_handle); - if (!q) + if (!q) { + NL_SET_ERR_MSG(extack, "Failed to find qdisc with specified handle"); return -ENOENT; + } } - if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) + if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) { + NL_SET_ERR_MSG(extack, "Invalid qdisc name"); return -EINVAL; + } if (n->nlmsg_type == RTM_DELQDISC) { - if (!clid) + if (!clid) { + NL_SET_ERR_MSG(extack, "Classid cannot be zero"); return -EINVAL; - if (q->handle == 0) + } + if (q->handle == 0) { + NL_SET_ERR_MSG(extack, "Cannot delete qdisc with handle of zero"); return -ENOENT; - err = qdisc_graft(dev, p, skb, n, clid, NULL, q); + } + err = qdisc_graft(dev, p, skb, n, clid, NULL, q, extack); if (err != 0) return err; } else { @@ -1333,8 +1369,10 @@ static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, if (clid != TC_H_ROOT) { if (clid != TC_H_INGRESS) { p = qdisc_lookup(dev, TC_H_MAJ(clid)); - if (!p) + if (!p) { + NL_SET_ERR_MSG(extack, "Failed to find specified qdisc"); return -ENOENT; + } q = qdisc_leaf(p, clid); } else if (dev_ingress_queue_create(dev)) { q = dev_ingress_queue(dev)->qdisc_sleeping; @@ -1349,21 +1387,33 @@ static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, if (!q || !tcm->tcm_handle || q->handle != tcm->tcm_handle) { if (tcm->tcm_handle) { - if (q && !(n->nlmsg_flags & NLM_F_REPLACE)) + if (q && !(n->nlmsg_flags & NLM_F_REPLACE)) { + NL_SET_ERR_MSG(extack, "NLM_F_REPLACE needed to override"); return -EEXIST; - if (TC_H_MIN(tcm->tcm_handle)) + } + if (TC_H_MIN(tcm->tcm_handle)) { + NL_SET_ERR_MSG(extack, "Invalid minor handle"); return -EINVAL; + } q = qdisc_lookup(dev, tcm->tcm_handle); - if (!q) + if (!q) { + NL_SET_ERR_MSG(extack, "No qdisc found for specified handle"); goto create_n_graft; - if (n->nlmsg_flags & NLM_F_EXCL) + } + if (n->nlmsg_flags & NLM_F_EXCL) { + NL_SET_ERR_MSG(extack, "Exclusivity flag on, cannot override"); return -EEXIST; + } if (tca[TCA_KIND] && - nla_strcmp(tca[TCA_KIND], q->ops->id)) + nla_strcmp(tca[TCA_KIND], q->ops->id)) { + NL_SET_ERR_MSG(extack, "Invalid qdisc name"); return -EINVAL; + } if (q == p || - (p && check_loop(q, p, 0))) + (p && check_loop(q, p, 0))) { + NL_SET_ERR_MSG(extack, "Qdisc parent/child loop detected"); return -ELOOP; + } qdisc_refcount_inc(q); goto graft; } else { @@ -1398,33 +1448,45 @@ static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, } } } else { - if (!tcm->tcm_handle) + if (!tcm->tcm_handle) { + NL_SET_ERR_MSG(extack, "Handle cannot be zero"); return -EINVAL; + } q = qdisc_lookup(dev, tcm->tcm_handle); } /* Change qdisc parameters */ - if (!q) + if (!q) { + NL_SET_ERR_MSG(extack, "Specified qdisc not found"); return -ENOENT; - if (n->nlmsg_flags & NLM_F_EXCL) + } + if (n->nlmsg_flags & NLM_F_EXCL) { + NL_SET_ERR_MSG(extack, "Exclusivity flag on, cannot modify"); return -EEXIST; - if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) + } + if (tca[TCA_KIND] && nla_strcmp(tca[TCA_KIND], q->ops->id)) { + NL_SET_ERR_MSG(extack, "Invalid qdisc name"); return -EINVAL; - err = qdisc_change(q, tca); + } + err = qdisc_change(q, tca, extack); if (err == 0) qdisc_notify(net, skb, n, clid, NULL, q); return err; create_n_graft: - if (!(n->nlmsg_flags & NLM_F_CREATE)) + if (!(n->nlmsg_flags & NLM_F_CREATE)) { + NL_SET_ERR_MSG(extack, "Qdisc not found. To create specify NLM_F_CREATE flag"); return -ENOENT; + } if (clid == TC_H_INGRESS) { - if (dev_ingress_queue(dev)) + if (dev_ingress_queue(dev)) { q = qdisc_create(dev, dev_ingress_queue(dev), p, tcm->tcm_parent, tcm->tcm_parent, - tca, &err); - else + tca, &err, extack); + } else { + NL_SET_ERR_MSG(extack, "Cannot find ingress queue for specified device"); err = -ENOENT; + } } else { struct netdev_queue *dev_queue; @@ -1437,7 +1499,7 @@ static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, q = qdisc_create(dev, dev_queue, p, tcm->tcm_parent, tcm->tcm_handle, - tca, &err); + tca, &err, extack); } if (q == NULL) { if (err == -EAGAIN) @@ -1446,7 +1508,7 @@ static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, } graft: - err = qdisc_graft(dev, p, skb, n, clid, q, NULL); + err = qdisc_graft(dev, p, skb, n, clid, q, NULL, extack); if (err) { if (q) qdisc_destroy(q);