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Miller" , David Ahern , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Ido Schimmel , Hangbin Liu , Beniamino Galvani Subject: [PATCHv2 net-next] IPv6: add extack info for inet6_addr_add/del Date: Wed, 19 Jul 2023 21:56:44 +0800 Message-Id: <20230719135644.3011570-1-liuhangbin@gmail.com> X-Mailer: git-send-email 2.38.1 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: kuba@kernel.org Add extack info for inet6_addr_add(), ipv6_add_addr() and inet6_addr_del(), which would be useful for users to understand the problem without having to read kernel code. Suggested-by: Beniamino Galvani Signed-off-by: Hangbin Liu --- BTW, please feel free to add comments if you think the extack message is not describe properly. v2: Update extack msg for dead dev. Remove msg for NOBUFS error. Add extack for ipv6_add_addr_hash() --- net/ipv6/addrconf.c | 71 +++++++++++++++++++++++++++++++-------------- 1 file changed, 50 insertions(+), 21 deletions(-) diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index e5213e598a04..4e0836d90e65 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -1027,7 +1027,8 @@ static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, return false; } -static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) +static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa, + struct netlink_ext_ack *extack) { struct net *net = dev_net(dev); unsigned int hash = inet6_addr_hash(net, &ifa->addr); @@ -1037,7 +1038,7 @@ static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) /* Ignore adding duplicate addresses on an interface */ if (ipv6_chk_same_addr(net, &ifa->addr, dev, hash)) { - netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); + NL_SET_ERR_MSG(extack, "ipv6_add_addr: already assigned"); err = -EEXIST; } else { hlist_add_head_rcu(&ifa->addr_lst, &net->ipv6.inet6_addr_lst[hash]); @@ -1066,15 +1067,19 @@ ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) || (!(idev->dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(idev->dev) && - addr_type & IPV6_ADDR_LOOPBACK)) + addr_type & IPV6_ADDR_LOOPBACK)) { + NL_SET_ERR_MSG(extack, "Cannot assign requested address"); return ERR_PTR(-EADDRNOTAVAIL); + } if (idev->dead) { - err = -ENODEV; /*XXX*/ + NL_SET_ERR_MSG(extack, "Device marked as dead"); + err = -ENODEV; goto out; } if (idev->cnf.disable_ipv6) { + NL_SET_ERR_MSG(extack, "IPv6 is disabled on this device"); err = -EACCES; goto out; } @@ -1103,6 +1108,7 @@ ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags); if (IS_ERR(f6i)) { + NL_SET_ERR_MSG(extack, "Dest allocate failed"); err = PTR_ERR(f6i); f6i = NULL; goto out; @@ -1140,7 +1146,7 @@ ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, rcu_read_lock(); - err = ipv6_add_addr_hash(idev->dev, ifa); + err = ipv6_add_addr_hash(idev->dev, ifa, extack); if (err < 0) { rcu_read_unlock(); goto out; @@ -2488,18 +2494,22 @@ static void addrconf_add_mroute(struct net_device *dev) ip6_route_add(&cfg, GFP_KERNEL, NULL); } -static struct inet6_dev *addrconf_add_dev(struct net_device *dev) +static struct inet6_dev *addrconf_add_dev(struct net_device *dev, struct netlink_ext_ack *extack) { struct inet6_dev *idev; ASSERT_RTNL(); idev = ipv6_find_idev(dev); - if (IS_ERR(idev)) + if (IS_ERR(idev)) { + NL_SET_ERR_MSG(extack, "No such device"); return idev; + } - if (idev->cnf.disable_ipv6) + if (idev->cnf.disable_ipv6) { + NL_SET_ERR_MSG(extack, "IPv6 is disabled on this device"); return ERR_PTR(-EACCES); + } /* Add default multicast route */ if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) @@ -2919,21 +2929,29 @@ static int inet6_addr_add(struct net *net, int ifindex, ASSERT_RTNL(); - if (cfg->plen > 128) + if (cfg->plen > 128) { + NL_SET_ERR_MSG(extack, "IPv6 address prefix length larger than 128"); return -EINVAL; + } /* check the lifetime */ - if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) + if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) { + NL_SET_ERR_MSG(extack, "IPv6 address lifetime invalid"); return -EINVAL; + } - if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) + if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) { + NL_SET_ERR_MSG(extack, "IPv6 address with mngtmpaddr flag must have prefix length 64"); return -EINVAL; + } dev = __dev_get_by_index(net, ifindex); - if (!dev) + if (!dev) { + NL_SET_ERR_MSG(extack, "Unable to find the interface"); return -ENODEV; + } - idev = addrconf_add_dev(dev); + idev = addrconf_add_dev(dev, extack); if (IS_ERR(idev)) return PTR_ERR(idev); @@ -2941,8 +2959,10 @@ static int inet6_addr_add(struct net *net, int ifindex, int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, true, cfg->pfx, ifindex); - if (ret < 0) + if (ret < 0) { + NL_SET_ERR_MSG(extack, "Multicast auto join failed"); return ret; + } } cfg->scope = ipv6_addr_scope(cfg->pfx); @@ -2999,22 +3019,29 @@ static int inet6_addr_add(struct net *net, int ifindex, } static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, - const struct in6_addr *pfx, unsigned int plen) + const struct in6_addr *pfx, unsigned int plen, + struct netlink_ext_ack *extack) { struct inet6_ifaddr *ifp; struct inet6_dev *idev; struct net_device *dev; - if (plen > 128) + if (plen > 128) { + NL_SET_ERR_MSG(extack, "IPv6 address prefix length larger than 128"); return -EINVAL; + } dev = __dev_get_by_index(net, ifindex); - if (!dev) + if (!dev) { + NL_SET_ERR_MSG(extack, "Unable to find the interface"); return -ENODEV; + } idev = __in6_dev_get(dev); - if (!idev) + if (!idev) { + NL_SET_ERR_MSG(extack, "No such address on the device"); return -ENXIO; + } read_lock_bh(&idev->lock); list_for_each_entry(ifp, &idev->addr_list, if_list) { @@ -3037,6 +3064,8 @@ static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, } } read_unlock_bh(&idev->lock); + + NL_SET_ERR_MSG(extack, "IPv6 address not found"); return -EADDRNOTAVAIL; } @@ -3079,7 +3108,7 @@ int addrconf_del_ifaddr(struct net *net, void __user *arg) rtnl_lock(); err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, - ireq.ifr6_prefixlen); + ireq.ifr6_prefixlen, NULL); rtnl_unlock(); return err; } @@ -3378,7 +3407,7 @@ static void addrconf_dev_config(struct net_device *dev) return; } - idev = addrconf_add_dev(dev); + idev = addrconf_add_dev(dev, NULL); if (IS_ERR(idev)) return; @@ -4692,7 +4721,7 @@ inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, ifa_flags &= IFA_F_MANAGETEMPADDR; return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, - ifm->ifa_prefixlen); + ifm->ifa_prefixlen, extack); } static int modify_prefix_route(struct inet6_ifaddr *ifp,