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[84.238.136.197]) by smtp.gmail.com with ESMTPSA id s11sm19637727wrt.43.2020.09.21.03.56.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 21 Sep 2020 03:56:09 -0700 (PDT) From: Nikolay Aleksandrov To: netdev@vger.kernel.org Cc: roopa@nvidia.com, davem@davemloft.net, bridge@lists.linux-foundation.org, Nikolay Aleksandrov Subject: [PATCH net-next 01/16] net: bridge: mdb: use extack in br_mdb_parse() Date: Mon, 21 Sep 2020 13:55:11 +0300 Message-Id: <20200921105526.1056983-2-razor@blackwall.org> X-Mailer: git-send-email 2.25.4 In-Reply-To: <20200921105526.1056983-1-razor@blackwall.org> References: <20200921105526.1056983-1-razor@blackwall.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Nikolay Aleksandrov We can drop the pr_info() calls and just use extack to return a meaningful error to user-space when br_mdb_parse() fails. Signed-off-by: Nikolay Aleksandrov --- net/bridge/br_mdb.c | 60 +++++++++++++++++++++++++++++---------------- 1 file changed, 39 insertions(+), 21 deletions(-) diff --git a/net/bridge/br_mdb.c b/net/bridge/br_mdb.c index 00f1651a6aba..d4031f5554f7 100644 --- a/net/bridge/br_mdb.c +++ b/net/bridge/br_mdb.c @@ -629,33 +629,50 @@ void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port, rtnl_set_sk_err(net, RTNLGRP_MDB, err); } -static bool is_valid_mdb_entry(struct br_mdb_entry *entry) +static bool is_valid_mdb_entry(struct br_mdb_entry *entry, + struct netlink_ext_ack *extack) { - if (entry->ifindex == 0) + if (entry->ifindex == 0) { + NL_SET_ERR_MSG_MOD(extack, "Zero entry ifindex is not allowed"); return false; + } if (entry->addr.proto == htons(ETH_P_IP)) { - if (!ipv4_is_multicast(entry->addr.u.ip4)) + if (!ipv4_is_multicast(entry->addr.u.ip4)) { + NL_SET_ERR_MSG_MOD(extack, "IPv4 entry group address is not multicast"); return false; - if (ipv4_is_local_multicast(entry->addr.u.ip4)) + } + if (ipv4_is_local_multicast(entry->addr.u.ip4)) { + NL_SET_ERR_MSG_MOD(extack, "IPv4 entry group address is local multicast"); return false; + } #if IS_ENABLED(CONFIG_IPV6) } else if (entry->addr.proto == htons(ETH_P_IPV6)) { - if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6)) + if (ipv6_addr_is_ll_all_nodes(&entry->addr.u.ip6)) { + NL_SET_ERR_MSG_MOD(extack, "IPv6 entry group address is link-local all nodes"); return false; + } #endif - } else + } else { + NL_SET_ERR_MSG_MOD(extack, "Unknown entry protocol"); return false; - if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY) + } + + if (entry->state != MDB_PERMANENT && entry->state != MDB_TEMPORARY) { + NL_SET_ERR_MSG_MOD(extack, "Unknown entry state"); return false; - if (entry->vid >= VLAN_VID_MASK) + } + if (entry->vid >= VLAN_VID_MASK) { + NL_SET_ERR_MSG_MOD(extack, "Invalid entry VLAN id"); return false; + } return true; } static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh, - struct net_device **pdev, struct br_mdb_entry **pentry) + struct net_device **pdev, struct br_mdb_entry **pentry, + struct netlink_ext_ack *extack) { struct net *net = sock_net(skb->sk); struct br_mdb_entry *entry; @@ -671,36 +688,37 @@ static int br_mdb_parse(struct sk_buff *skb, struct nlmsghdr *nlh, bpm = nlmsg_data(nlh); if (bpm->ifindex == 0) { - pr_info("PF_BRIDGE: br_mdb_parse() with invalid ifindex\n"); + NL_SET_ERR_MSG_MOD(extack, "Invalid bridge ifindex"); return -EINVAL; } dev = __dev_get_by_index(net, bpm->ifindex); if (dev == NULL) { - pr_info("PF_BRIDGE: br_mdb_parse() with unknown ifindex\n"); + NL_SET_ERR_MSG_MOD(extack, "Bridge device doesn't exist"); return -ENODEV; } if (!(dev->priv_flags & IFF_EBRIDGE)) { - pr_info("PF_BRIDGE: br_mdb_parse() with non-bridge\n"); + NL_SET_ERR_MSG_MOD(extack, "Device is not a bridge"); return -EOPNOTSUPP; } *pdev = dev; - if (!tb[MDBA_SET_ENTRY] || - nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) { - pr_info("PF_BRIDGE: br_mdb_parse() with invalid attr\n"); + if (!tb[MDBA_SET_ENTRY]) { + NL_SET_ERR_MSG_MOD(extack, "Missing MDBA_SET_ENTRY attribute"); return -EINVAL; } - - entry = nla_data(tb[MDBA_SET_ENTRY]); - if (!is_valid_mdb_entry(entry)) { - pr_info("PF_BRIDGE: br_mdb_parse() with invalid entry\n"); + if (nla_len(tb[MDBA_SET_ENTRY]) != sizeof(struct br_mdb_entry)) { + NL_SET_ERR_MSG_MOD(extack, "Invalid MDBA_SET_ENTRY attribute length"); return -EINVAL; } + entry = nla_data(tb[MDBA_SET_ENTRY]); + if (!is_valid_mdb_entry(entry, extack)) + return -EINVAL; *pentry = entry; + return 0; } @@ -797,7 +815,7 @@ static int br_mdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, struct net_bridge *br; int err; - err = br_mdb_parse(skb, nlh, &dev, &entry); + err = br_mdb_parse(skb, nlh, &dev, &entry, extack); if (err < 0) return err; @@ -892,7 +910,7 @@ static int br_mdb_del(struct sk_buff *skb, struct nlmsghdr *nlh, struct net_bridge *br; int err; - err = br_mdb_parse(skb, nlh, &dev, &entry); + err = br_mdb_parse(skb, nlh, &dev, &entry, extack); if (err < 0) return err;