From patchwork Mon Sep 3 04:37:16 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christian Brauner X-Patchwork-Id: 965206 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@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; dmarc=none (p=none dis=none) header.from=brauner.io Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 423chS1xCcz9s3Z for ; Mon, 3 Sep 2018 14:40:08 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727216AbeICI60 (ORCPT ); Mon, 3 Sep 2018 04:58:26 -0400 Received: from mail-wm0-f66.google.com ([74.125.82.66]:37569 "EHLO mail-wm0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725892AbeICI6Z (ORCPT ); Mon, 3 Sep 2018 04:58:25 -0400 Received: by mail-wm0-f66.google.com with SMTP id n11-v6so10271303wmc.2; Sun, 02 Sep 2018 21:40:00 -0700 (PDT) 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=dx2iCJFRRNJtzuTKhjb6tFjNM9NxC55sSey/TrC6dE0=; b=gg+dIP9ozt5v0e0xeNYQRfKMC/V2OiifrtySE4N7q2UKN5sx4wAGYOkzzUSNfgSzyf Trc85DHB8MZLTAVO59yj+DCjoGWsOEOI1GG1zenD1jASM12UCnbvT4VZwKO3C8WeOJji WlfpE2klrdOQG+g+WaWGEUrAw38v0rU8TxUa2mvUI9gTqSGJwK3h/ykPaQzu5rAm1TTz LmgMrExPPVMbd71yOWkfdx/ClqmVJPIYkksM1XrlYRszg0OraoVZm+YoWg0O/1FJEFb+ lkgiWVLSLMHQIyCs23c+zUqhlh2k/1KDFB2Dha9HAwanQ04Dr9pKHcFpXE/IiiSr6vUQ X19g== X-Gm-Message-State: APzg51BapB+6Tno7PSl8NDW+Pdp+WXrfEPfNK+nKJ0x7/bOpfLuPdBCz FiTEAm4ViAREAuojjzRNM6b6QAfow3skRw== X-Google-Smtp-Source: ANB0Vda6gIg6E5qetheroPHM/vdwmz/nPz3CrnYExqRcX7RBSrleYLOUSy7PFAdx90Mh01+sKOcsPg== X-Received: by 2002:a1c:1a48:: with SMTP id a69-v6mr3873028wma.43.1535949599646; Sun, 02 Sep 2018 21:39:59 -0700 (PDT) Received: from localhost.localdomain ([88.128.81.0]) by smtp.gmail.com with ESMTPSA id j66-v6sm22453364wrj.28.2018.09.02.21.39.39 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 02 Sep 2018 21:39:59 -0700 (PDT) From: Christian Brauner To: netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: davem@davemloft.net, kuznet@ms2.inr.ac.ru, yoshfuji@linux-ipv6.org, pombredanne@nexb.com, kstewart@linuxfoundation.org, gregkh@linuxfoundation.org, dsahern@gmail.com, fw@strlen.de, ktkhai@virtuozzo.com, lucien.xin@gmail.com, jakub.kicinski@netronome.com, jbenc@redhat.com, nicolas.dichtel@6wind.com, Christian Brauner Subject: [PATCH net-next v1 4/5] ipv6: enable IFA_IF_NETNSID for RTM_GETADDR Date: Mon, 3 Sep 2018 06:37:16 +0200 Message-Id: <20180903043717.20136-5-christian@brauner.io> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180903043717.20136-1-christian@brauner.io> References: <20180903043717.20136-1-christian@brauner.io> Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org - Backwards Compatibility: If userspace wants to determine whether ipv6 RTM_GETADDR requests support the new IFA_IF_NETNSID property they should verify that the reply after sending a request includes the IFA_IF_NETNSID property. If it does not userspace should assume that IFA_IF_NETNSID is not supported for ipv6 RTM_GETADDR requests on this kernel. - From what I gather from current userspace tools that make use of RTM_GETADDR requests some of them pass down struct ifinfomsg when they should actually pass down struct ifaddrmsg. To not break existing tools that pass down the wrong struct we will do the same as for RTM_GETLINK | NLM_F_DUMP requests and not error out when the nlmsg_parse() fails. - Security: Callers must have CAP_NET_ADMIN in the owning user namespace of the target network namespace. Signed-off-by: Christian Brauner --- v0->v1: - unchanged --- net/ipv6/addrconf.c | 70 +++++++++++++++++++++++++++++++++++---------- 1 file changed, 55 insertions(+), 15 deletions(-) diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index d51a8c0b3372..00f1af374150 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -4491,6 +4491,7 @@ static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, [IFA_FLAGS] = { .len = sizeof(u32) }, [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, + [IFA_IF_NETNSID] = { .type = NLA_S32 }, }; static int @@ -4794,7 +4795,8 @@ static inline int inet6_ifaddr_msgsize(void) } static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, - u32 portid, u32 seq, int event, unsigned int flags) + u32 portid, u32 seq, int event, unsigned int flags, + int netnsid) { struct nlmsghdr *nlh; u32 preferred, valid; @@ -4806,6 +4808,9 @@ static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), ifa->idev->dev->ifindex); + if (netnsid >= 0 && nla_put_s32(skb, IFA_IF_NETNSID, netnsid)) + goto error; + if (!((ifa->flags&IFA_F_PERMANENT) && (ifa->prefered_lft == INFINITY_LIFE_TIME))) { preferred = ifa->prefered_lft; @@ -4855,7 +4860,8 @@ static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, } static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, - u32 portid, u32 seq, int event, u16 flags) + u32 portid, u32 seq, int event, u16 flags, + int netnsid) { struct nlmsghdr *nlh; u8 scope = RT_SCOPE_UNIVERSE; @@ -4868,6 +4874,9 @@ static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, if (!nlh) return -EMSGSIZE; + if (netnsid >= 0 && nla_put_s32(skb, IFA_IF_NETNSID, netnsid)) + return -EMSGSIZE; + put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, @@ -4881,7 +4890,8 @@ static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, } static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, - u32 portid, u32 seq, int event, unsigned int flags) + u32 portid, u32 seq, int event, + unsigned int flags, int netnsid) { struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); int ifindex = dev ? dev->ifindex : 1; @@ -4895,6 +4905,9 @@ static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, if (!nlh) return -EMSGSIZE; + if (netnsid >= 0 && nla_put_s32(skb, IFA_IF_NETNSID, netnsid)) + return -EMSGSIZE; + put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, @@ -4916,7 +4929,7 @@ enum addr_type_t { /* called with rcu_read_lock() */ static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, struct netlink_callback *cb, enum addr_type_t type, - int s_ip_idx, int *p_ip_idx) + int s_ip_idx, int *p_ip_idx, int netnsid) { struct ifmcaddr6 *ifmca; struct ifacaddr6 *ifaca; @@ -4936,7 +4949,7 @@ static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, RTM_NEWADDR, - NLM_F_MULTI); + NLM_F_MULTI, netnsid); if (err < 0) break; nl_dump_check_consistent(cb, nlmsg_hdr(skb)); @@ -4953,7 +4966,7 @@ static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, RTM_GETMULTICAST, - NLM_F_MULTI); + NLM_F_MULTI, netnsid); if (err < 0) break; } @@ -4968,7 +4981,7 @@ static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, RTM_GETANYCAST, - NLM_F_MULTI); + NLM_F_MULTI, netnsid); if (err < 0) break; } @@ -4985,6 +4998,9 @@ static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, enum addr_type_t type) { struct net *net = sock_net(skb->sk); + struct nlattr *tb[IFA_MAX+1]; + struct net *tgt_net = net; + int netnsid = -1; int h, s_h; int idx, ip_idx; int s_idx, s_ip_idx; @@ -4996,11 +5012,22 @@ static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, s_idx = idx = cb->args[1]; s_ip_idx = ip_idx = cb->args[2]; + if (nlmsg_parse(cb->nlh, sizeof(struct ifaddrmsg), tb, IFA_MAX, + ifa_ipv6_policy, NULL) >= 0) { + if (tb[IFA_IF_NETNSID]) { + netnsid = nla_get_s32(tb[IFA_IF_NETNSID]); + + tgt_net = rtnl_get_net_ns_capable(skb->sk, netnsid); + if (IS_ERR(tgt_net)) + return PTR_ERR(tgt_net); + } + } + rcu_read_lock(); - cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; + cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq; for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { idx = 0; - head = &net->dev_index_head[h]; + head = &tgt_net->dev_index_head[h]; hlist_for_each_entry_rcu(dev, head, index_hlist) { if (idx < s_idx) goto cont; @@ -5012,7 +5039,7 @@ static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, goto cont; if (in6_dump_addrs(idev, skb, cb, type, - s_ip_idx, &ip_idx) < 0) + s_ip_idx, &ip_idx, netnsid) < 0) goto done; cont: idx++; @@ -5023,6 +5050,8 @@ static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, cb->args[0] = h; cb->args[1] = idx; cb->args[2] = ip_idx; + if (netnsid >= 0) + put_net(tgt_net); return skb->len; } @@ -5053,12 +5082,14 @@ static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, struct netlink_ext_ack *extack) { struct net *net = sock_net(in_skb->sk); + struct net *tgt_net = net; struct ifaddrmsg *ifm; struct nlattr *tb[IFA_MAX+1]; struct in6_addr *addr = NULL, *peer; struct net_device *dev = NULL; struct inet6_ifaddr *ifa; struct sk_buff *skb; + int netnsid = -1; int err; err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, @@ -5066,15 +5097,24 @@ static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, if (err < 0) return err; + if (tb[IFA_IF_NETNSID]) { + netnsid = nla_get_s32(tb[IFA_IF_NETNSID]); + + tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, + netnsid); + if (IS_ERR(tgt_net)) + return PTR_ERR(tgt_net); + } + addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); if (!addr) return -EINVAL; ifm = nlmsg_data(nlh); if (ifm->ifa_index) - dev = dev_get_by_index(net, ifm->ifa_index); + dev = dev_get_by_index(tgt_net, ifm->ifa_index); - ifa = ipv6_get_ifaddr(net, addr, dev, 1); + ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); if (!ifa) { err = -EADDRNOTAVAIL; goto errout; @@ -5087,14 +5127,14 @@ static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, } err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, - nlh->nlmsg_seq, RTM_NEWADDR, 0); + nlh->nlmsg_seq, RTM_NEWADDR, 0, netnsid); if (err < 0) { /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ WARN_ON(err == -EMSGSIZE); kfree_skb(skb); goto errout_ifa; } - err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); + err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); errout_ifa: in6_ifa_put(ifa); errout: @@ -5113,7 +5153,7 @@ static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) if (!skb) goto errout; - err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); + err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0, -1); if (err < 0) { /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ WARN_ON(err == -EMSGSIZE);