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