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Miller" , Jakub Kicinski , "Petr Machata" Subject: [PATCH net-next 12/14] nexthop: Add netlink handlers for bucket get Date: Wed, 10 Mar 2021 16:03:03 +0100 Message-ID: <85186adc516de72219b72d0dbfb957554371eed8.1615387786.git.petrm@nvidia.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: References: MIME-Version: 1.0 X-Originating-IP: [172.20.145.6] X-ClientProxiedBy: HQMAIL105.nvidia.com (172.20.187.12) To HQMAIL107.nvidia.com (172.20.187.13) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 57c6baa4-a03b-472b-9dee-08d8e3d5cb56 X-MS-TrafficTypeDiagnostic: DM6PR12MB3945: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:2733; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.112.34; CTRY:US; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:mail.nvidia.com; PTR:schybrid03.nvidia.com; CAT:NONE; SFS:(4636009)(346002)(376002)(396003)(136003)(39860400002)(46966006)(36840700001)(426003)(47076005)(36906005)(2616005)(36860700001)(107886003)(6666004)(316002)(8676002)(8936002)(82740400003)(70586007)(83380400001)(70206006)(2906002)(336012)(36756003)(356005)(54906003)(4326008)(26005)(5660300002)(86362001)(16526019)(186003)(478600001)(6916009)(82310400003)(34020700004)(7636003); DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Mar 2021 15:04:24.9517 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 57c6baa4-a03b-472b-9dee-08d8e3d5cb56 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a; Ip=[216.228.112.34]; Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT021.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB3945 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Allow getting (but not setting) individual buckets to inspect the next hop mapped therein, idle time, and flags. Signed-off-by: Petr Machata Reviewed-by: Ido Schimmel Reviewed-by: David Ahern --- Notes: v1 (changes since RFC): - u32 -> u16 for bucket counts / indices net/ipv4/nexthop.c | 110 ++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 109 insertions(+), 1 deletion(-) diff --git a/net/ipv4/nexthop.c b/net/ipv4/nexthop.c index ed2745708f9d..3d602ef6f2c1 100644 --- a/net/ipv4/nexthop.c +++ b/net/ipv4/nexthop.c @@ -66,6 +66,15 @@ static const struct nla_policy rtm_nh_res_bucket_policy_dump[] = { [NHA_RES_BUCKET_NH_ID] = { .type = NLA_U32 }, }; +static const struct nla_policy rtm_nh_policy_get_bucket[] = { + [NHA_ID] = { .type = NLA_U32 }, + [NHA_RES_BUCKET] = { .type = NLA_NESTED }, +}; + +static const struct nla_policy rtm_nh_res_bucket_policy_get[] = { + [NHA_RES_BUCKET_INDEX] = { .type = NLA_U16 }, +}; + static bool nexthop_notifiers_is_empty(struct net *net) { return !net->nexthop.notifier_chain.head; @@ -3381,6 +3390,105 @@ static int rtm_dump_nexthop_bucket(struct sk_buff *skb, return err; } +static int nh_valid_get_bucket_req_res_bucket(struct nlattr *res, + u16 *bucket_index, + struct netlink_ext_ack *extack) +{ + struct nlattr *tb[ARRAY_SIZE(rtm_nh_res_bucket_policy_get)]; + int err; + + err = nla_parse_nested(tb, ARRAY_SIZE(rtm_nh_res_bucket_policy_get) - 1, + res, rtm_nh_res_bucket_policy_get, extack); + if (err < 0) + return err; + + if (!tb[NHA_RES_BUCKET_INDEX]) { + NL_SET_ERR_MSG(extack, "Bucket index is missing"); + return -EINVAL; + } + + *bucket_index = nla_get_u16(tb[NHA_RES_BUCKET_INDEX]); + return 0; +} + +static int nh_valid_get_bucket_req(const struct nlmsghdr *nlh, + u32 *id, u16 *bucket_index, + struct netlink_ext_ack *extack) +{ + struct nlattr *tb[ARRAY_SIZE(rtm_nh_policy_get_bucket)]; + int err; + + err = nlmsg_parse(nlh, sizeof(struct nhmsg), tb, + ARRAY_SIZE(rtm_nh_policy_get_bucket) - 1, + rtm_nh_policy_get_bucket, extack); + if (err < 0) + return err; + + err = __nh_valid_get_del_req(nlh, tb, id, extack); + if (err) + return err; + + if (!tb[NHA_RES_BUCKET]) { + NL_SET_ERR_MSG(extack, "Bucket information is missing"); + return -EINVAL; + } + + err = nh_valid_get_bucket_req_res_bucket(tb[NHA_RES_BUCKET], + bucket_index, extack); + if (err) + return err; + + return 0; +} + +/* rtnl */ +static int rtm_get_nexthop_bucket(struct sk_buff *in_skb, struct nlmsghdr *nlh, + struct netlink_ext_ack *extack) +{ + struct net *net = sock_net(in_skb->sk); + struct nh_res_table *res_table; + struct sk_buff *skb = NULL; + struct nh_group *nhg; + struct nexthop *nh; + u16 bucket_index; + int err; + u32 id; + + err = nh_valid_get_bucket_req(nlh, &id, &bucket_index, extack); + if (err) + return err; + + nh = nexthop_find_group_resilient(net, id, extack); + if (IS_ERR(nh)) + return PTR_ERR(nh); + + nhg = rtnl_dereference(nh->nh_grp); + res_table = rtnl_dereference(nhg->res_table); + if (bucket_index >= res_table->num_nh_buckets) { + NL_SET_ERR_MSG(extack, "Bucket index out of bounds"); + return -ENOENT; + } + + skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); + if (!skb) + return -ENOBUFS; + + err = nh_fill_res_bucket(skb, nh, &res_table->nh_buckets[bucket_index], + bucket_index, RTM_NEWNEXTHOPBUCKET, + NETLINK_CB(in_skb).portid, nlh->nlmsg_seq, + 0, extack); + if (err < 0) { + WARN_ON(err == -EMSGSIZE); + goto errout_free; + } + + return rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); + +errout_free: + kfree_skb(skb); + return err; +} + static void nexthop_sync_mtu(struct net_device *dev, u32 orig_mtu) { unsigned int hash = nh_dev_hashfn(dev->ifindex); @@ -3604,7 +3712,7 @@ static int __init nexthop_init(void) rtnl_register(PF_INET6, RTM_NEWNEXTHOP, rtm_new_nexthop, NULL, 0); rtnl_register(PF_INET6, RTM_GETNEXTHOP, NULL, rtm_dump_nexthop, 0); - rtnl_register(PF_UNSPEC, RTM_GETNEXTHOPBUCKET, NULL, + rtnl_register(PF_UNSPEC, RTM_GETNEXTHOPBUCKET, rtm_get_nexthop_bucket, rtm_dump_nexthop_bucket, 0); return 0;