net/smc/smc_diag.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Shared Memory Communications over RDMA (SMC-R) and RoCE
   4  *
   5  * Monitoring SMC transport protocol sockets
   6  *
   7  * Copyright IBM Corp. 2016
   8  *
   9  * Author(s):  Ursula Braun <ubraun@linux.vnet.ibm.com>
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/types.h>
  15 #include <linux/init.h>
  16 #include <linux/sock_diag.h>
  17 #include <linux/inet_diag.h>
  18 #include <linux/smc_diag.h>
  19 #include <net/netlink.h>
  20 #include <net/smc.h>
  21
  22 #include "smc.h"
  23 #include "smc_core.h"
  24
  25 static void smc_gid_be16_convert(__u8 *buf, u8 *gid_raw)
  26 {
  27         sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x",
  28                 be16_to_cpu(((__be16 *)gid_raw)[0]),
  29                 be16_to_cpu(((__be16 *)gid_raw)[1]),
  30                 be16_to_cpu(((__be16 *)gid_raw)[2]),
  31                 be16_to_cpu(((__be16 *)gid_raw)[3]),
  32                 be16_to_cpu(((__be16 *)gid_raw)[4]),
  33                 be16_to_cpu(((__be16 *)gid_raw)[5]),
  34                 be16_to_cpu(((__be16 *)gid_raw)[6]),
  35                 be16_to_cpu(((__be16 *)gid_raw)[7]));
  36 }
  37
  38 static void smc_diag_msg_common_fill(struct smc_diag_msg *r, struct sock *sk)
  39 {
  40         struct smc_sock *smc = smc_sk(sk);
  41
  42         r->diag_family = sk->sk_family;
  43         if (!smc->clcsock)
  44                 return;
  45         r->id.idiag_sport = htons(smc->clcsock->sk->sk_num);
  46         r->id.idiag_dport = smc->clcsock->sk->sk_dport;
  47         r->id.idiag_if = smc->clcsock->sk->sk_bound_dev_if;
  48         sock_diag_save_cookie(sk, r->id.idiag_cookie);
  49         if (sk->sk_protocol == SMCPROTO_SMC) {
  50                 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
  51                 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
  52                 r->id.idiag_src[0] = smc->clcsock->sk->sk_rcv_saddr;
  53                 r->id.idiag_dst[0] = smc->clcsock->sk->sk_daddr;
  54 #if IS_ENABLED(CONFIG_IPV6)
  55         } else if (sk->sk_protocol == SMCPROTO_SMC6) {
  56                 memcpy(&r->id.idiag_src, &smc->clcsock->sk->sk_v6_rcv_saddr,
  57                        sizeof(smc->clcsock->sk->sk_v6_rcv_saddr));
  58                 memcpy(&r->id.idiag_dst, &smc->clcsock->sk->sk_v6_daddr,
  59                        sizeof(smc->clcsock->sk->sk_v6_daddr));
  60 #endif
  61         }
  62 }
  63
  64 static int smc_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
  65                                    struct smc_diag_msg *r,
  66                                    struct user_namespace *user_ns)
  67 {
  68         if (nla_put_u8(skb, SMC_DIAG_SHUTDOWN, sk->sk_shutdown))
  69                 return 1;
  70
  71         r->diag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
  72         r->diag_inode = sock_i_ino(sk);
  73         return 0;
  74 }
  75
  76 static int __smc_diag_dump(struct sock *sk, struct sk_buff *skb,
  77                            struct netlink_callback *cb,
  78                            const struct smc_diag_req *req,
  79                            struct nlattr *bc)
  80 {
  81         struct smc_sock *smc = smc_sk(sk);
  82         struct smc_diag_fallback fallback;
  83         struct user_namespace *user_ns;
  84         struct smc_diag_msg *r;
  85         struct nlmsghdr *nlh;
  86
  87         nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
  88                         cb->nlh->nlmsg_type, sizeof(*r), NLM_F_MULTI);
  89         if (!nlh)
  90                 return -EMSGSIZE;
  91
  92         r = nlmsg_data(nlh);
  93         smc_diag_msg_common_fill(r, sk);
  94         r->diag_state = sk->sk_state;
  95         if (smc->use_fallback)
  96                 r->diag_mode = SMC_DIAG_MODE_FALLBACK_TCP;
  97         else if (smc->conn.lgr && smc->conn.lgr->is_smcd)
  98                 r->diag_mode = SMC_DIAG_MODE_SMCD;
  99         else
 100                 r->diag_mode = SMC_DIAG_MODE_SMCR;
 101         user_ns = sk_user_ns(NETLINK_CB(cb->skb).sk);
 102         if (smc_diag_msg_attrs_fill(sk, skb, r, user_ns))
 103                 goto errout;
 104
 105         fallback.reason = smc->fallback_rsn;
 106         fallback.peer_diagnosis = smc->peer_diagnosis;
 107         if (nla_put(skb, SMC_DIAG_FALLBACK, sizeof(fallback), &fallback) < 0)
 108                 goto errout;
 109
 110         if ((req->diag_ext & (1 << (SMC_DIAG_CONNINFO - 1))) &&
 111             smc->conn.alert_token_local) {
 112                 struct smc_connection *conn = &smc->conn;
 113                 struct smc_diag_conninfo cinfo = {
 114                         .token = conn->alert_token_local,
 115                         .sndbuf_size = conn->sndbuf_desc ?
 116                                 conn->sndbuf_desc->len : 0,
 117                         .rmbe_size = conn->rmb_desc ? conn->rmb_desc->len : 0,
 118                         .peer_rmbe_size = conn->peer_rmbe_size,
 119
 120                         .rx_prod.wrap = conn->local_rx_ctrl.prod.wrap,
 121                         .rx_prod.count = conn->local_rx_ctrl.prod.count,
 122                         .rx_cons.wrap = conn->local_rx_ctrl.cons.wrap,
 123                         .rx_cons.count = conn->local_rx_ctrl.cons.count,
 124
 125                         .tx_prod.wrap = conn->local_tx_ctrl.prod.wrap,
 126                         .tx_prod.count = conn->local_tx_ctrl.prod.count,
 127                         .tx_cons.wrap = conn->local_tx_ctrl.cons.wrap,
 128                         .tx_cons.count = conn->local_tx_ctrl.cons.count,
 129
 130                         .tx_prod_flags =
 131                                 *(u8 *)&conn->local_tx_ctrl.prod_flags,
 132                         .tx_conn_state_flags =
 133                                 *(u8 *)&conn->local_tx_ctrl.conn_state_flags,
 134                         .rx_prod_flags = *(u8 *)&conn->local_rx_ctrl.prod_flags,
 135                         .rx_conn_state_flags =
 136                                 *(u8 *)&conn->local_rx_ctrl.conn_state_flags,
 137
 138                         .tx_prep.wrap = conn->tx_curs_prep.wrap,
 139                         .tx_prep.count = conn->tx_curs_prep.count,
 140                         .tx_sent.wrap = conn->tx_curs_sent.wrap,
 141                         .tx_sent.count = conn->tx_curs_sent.count,
 142                         .tx_fin.wrap = conn->tx_curs_fin.wrap,
 143                         .tx_fin.count = conn->tx_curs_fin.count,
 144                 };
 145
 146                 if (nla_put(skb, SMC_DIAG_CONNINFO, sizeof(cinfo), &cinfo) < 0)
 147                         goto errout;
 148         }
 149
 150         if (smc->conn.lgr && !smc->conn.lgr->is_smcd &&
 151             (req->diag_ext & (1 << (SMC_DIAG_LGRINFO - 1))) &&
 152             !list_empty(&smc->conn.lgr->list)) {
 153                 struct smc_diag_lgrinfo linfo = {
 154                         .role = smc->conn.lgr->role,
 155                         .lnk[0].ibport = smc->conn.lgr->lnk[0].ibport,
 156                         .lnk[0].link_id = smc->conn.lgr->lnk[0].link_id,
 157                 };
 158
 159                 memcpy(linfo.lnk[0].ibname,
 160                        smc->conn.lgr->lnk[0].smcibdev->ibdev->name,
 161                        sizeof(smc->conn.lgr->lnk[0].smcibdev->ibdev->name));
 162                 smc_gid_be16_convert(linfo.lnk[0].gid,
 163                                      smc->conn.lgr->lnk[0].gid);
 164                 smc_gid_be16_convert(linfo.lnk[0].peer_gid,
 165                                      smc->conn.lgr->lnk[0].peer_gid);
 166
 167                 if (nla_put(skb, SMC_DIAG_LGRINFO, sizeof(linfo), &linfo) < 0)
 168                         goto errout;
 169         }
 170         if (smc->conn.lgr && smc->conn.lgr->is_smcd &&
 171             (req->diag_ext & (1 << (SMC_DIAG_DMBINFO - 1))) &&
 172             !list_empty(&smc->conn.lgr->list)) {
 173                 struct smc_connection *conn = &smc->conn;
 174                 struct smcd_diag_dmbinfo dinfo = {
 175                         .linkid = *((u32 *)conn->lgr->id),
 176                         .peer_gid = conn->lgr->peer_gid,
 177                         .my_gid = conn->lgr->smcd->local_gid,
 178                         .token = conn->rmb_desc->token,
 179                         .peer_token = conn->peer_token
 180                 };
 181
 182                 if (nla_put(skb, SMC_DIAG_DMBINFO, sizeof(dinfo), &dinfo) < 0)
 183                         goto errout;
 184         }
 185
 186         nlmsg_end(skb, nlh);
 187         return 0;
 188
 189 errout:
 190         nlmsg_cancel(skb, nlh);
 191         return -EMSGSIZE;
 192 }
 193
 194 static int smc_diag_dump_proto(struct proto *prot, struct sk_buff *skb,
 195                                struct netlink_callback *cb)
 196 {
 197         struct net *net = sock_net(skb->sk);
 198         struct nlattr *bc = NULL;
 199         struct hlist_head *head;
 200         struct sock *sk;
 201         int rc = 0;
 202
 203         read_lock(&prot->h.smc_hash->lock);
 204         head = &prot->h.smc_hash->ht;
 205         if (hlist_empty(head))
 206                 goto out;
 207
 208         sk_for_each(sk, head) {
 209                 if (!net_eq(sock_net(sk), net))
 210                         continue;
 211                 rc = __smc_diag_dump(sk, skb, cb, nlmsg_data(cb->nlh), bc);
 212                 if (rc)
 213                         break;
 214         }
 215
 216 out:
 217         read_unlock(&prot->h.smc_hash->lock);
 218         return rc;
 219 }
 220
 221 static int smc_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
 222 {
 223         int rc = 0;
 224
 225         rc = smc_diag_dump_proto(&smc_proto, skb, cb);
 226         if (!rc)
 227                 rc = smc_diag_dump_proto(&smc_proto6, skb, cb);
 228         return rc;
 229 }
 230
 231 static int smc_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
 232 {
 233         struct net *net = sock_net(skb->sk);
 234
 235         if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
 236             h->nlmsg_flags & NLM_F_DUMP) {
 237                 {
 238                         struct netlink_dump_control c = {
 239                                 .dump = smc_diag_dump,
 240                                 .min_dump_alloc = SKB_WITH_OVERHEAD(32768),
 241                         };
 242                         return netlink_dump_start(net->diag_nlsk, skb, h, &c);
 243                 }
 244         }
 245         return 0;
 246 }
 247
 248 static const struct sock_diag_handler smc_diag_handler = {
 249         .family = AF_SMC,
 250         .dump = smc_diag_handler_dump,
 251 };
 252
 253 static int __init smc_diag_init(void)
 254 {
 255         return sock_diag_register(&smc_diag_handler);
 256 }
 257
 258 static void __exit smc_diag_exit(void)
 259 {
 260         sock_diag_unregister(&smc_diag_handler);
 261 }
 262
 263 module_init(smc_diag_init);
 264 module_exit(smc_diag_exit);
 265 MODULE_LICENSE("GPL");
 266 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 43 /* AF_SMC */);