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 #include "smc_ism.h"
  25
  26 struct smc_diag_dump_ctx {
  27         int pos[2];
  28 };
  29
  30 static struct smc_diag_dump_ctx *smc_dump_context(struct netlink_callback *cb)
  31 {
  32         return (struct smc_diag_dump_ctx *)cb->ctx;
  33 }
  34
  35 static void smc_diag_msg_common_fill(struct smc_diag_msg *r, struct sock *sk)
  36 {
  37         struct smc_sock *smc = smc_sk(sk);
  38
  39         memset(r, 0, sizeof(*r));
  40         r->diag_family = sk->sk_family;
  41         sock_diag_save_cookie(sk, r->id.idiag_cookie);
  42         if (!smc->clcsock)
  43                 return;
  44         r->id.idiag_sport = htons(smc->clcsock->sk->sk_num);
  45         r->id.idiag_dport = smc->clcsock->sk->sk_dport;
  46         r->id.idiag_if = smc->clcsock->sk->sk_bound_dev_if;
  47         if (sk->sk_protocol == SMCPROTO_SMC) {
  48                 r->id.idiag_src[0] = smc->clcsock->sk->sk_rcv_saddr;
  49                 r->id.idiag_dst[0] = smc->clcsock->sk->sk_daddr;
  50 #if IS_ENABLED(CONFIG_IPV6)
  51         } else if (sk->sk_protocol == SMCPROTO_SMC6) {
  52                 memcpy(&r->id.idiag_src, &smc->clcsock->sk->sk_v6_rcv_saddr,
  53                        sizeof(smc->clcsock->sk->sk_v6_rcv_saddr));
  54                 memcpy(&r->id.idiag_dst, &smc->clcsock->sk->sk_v6_daddr,
  55                        sizeof(smc->clcsock->sk->sk_v6_daddr));
  56 #endif
  57         }
  58 }
  59
  60 static int smc_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
  61                                    struct smc_diag_msg *r,
  62                                    struct user_namespace *user_ns)
  63 {
  64         if (nla_put_u8(skb, SMC_DIAG_SHUTDOWN, sk->sk_shutdown))
  65                 return 1;
  66
  67         r->diag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
  68         r->diag_inode = sock_i_ino(sk);
  69         return 0;
  70 }
  71
  72 static int __smc_diag_dump(struct sock *sk, struct sk_buff *skb,
  73                            struct netlink_callback *cb,
  74                            const struct smc_diag_req *req,
  75                            struct nlattr *bc)
  76 {
  77         struct smc_sock *smc = smc_sk(sk);
  78         struct smc_diag_fallback fallback;
  79         struct user_namespace *user_ns;
  80         struct smc_diag_msg *r;
  81         struct nlmsghdr *nlh;
  82
  83         nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
  84                         cb->nlh->nlmsg_type, sizeof(*r), NLM_F_MULTI);
  85         if (!nlh)
  86                 return -EMSGSIZE;
  87
  88         r = nlmsg_data(nlh);
  89         smc_diag_msg_common_fill(r, sk);
  90         r->diag_state = sk->sk_state;
  91         if (smc->use_fallback)
  92                 r->diag_mode = SMC_DIAG_MODE_FALLBACK_TCP;
  93         else if (smc_conn_lgr_valid(&smc->conn) && smc->conn.lgr->is_smcd)
  94                 r->diag_mode = SMC_DIAG_MODE_SMCD;
  95         else
  96                 r->diag_mode = SMC_DIAG_MODE_SMCR;
  97         user_ns = sk_user_ns(NETLINK_CB(cb->skb).sk);
  98         if (smc_diag_msg_attrs_fill(sk, skb, r, user_ns))
  99                 goto errout;
 100
 101         fallback.reason = smc->fallback_rsn;
 102         fallback.peer_diagnosis = smc->peer_diagnosis;
 103         if (nla_put(skb, SMC_DIAG_FALLBACK, sizeof(fallback), &fallback) < 0)
 104                 goto errout;
 105
 106         if ((req->diag_ext & (1 << (SMC_DIAG_CONNINFO - 1))) &&
 107             smc->conn.alert_token_local) {
 108                 struct smc_connection *conn = &smc->conn;
 109                 struct smc_diag_conninfo cinfo = {
 110                         .token = conn->alert_token_local,
 111                         .sndbuf_size = conn->sndbuf_desc ?
 112                                 conn->sndbuf_desc->len : 0,
 113                         .rmbe_size = conn->rmb_desc ? conn->rmb_desc->len : 0,
 114                         .peer_rmbe_size = conn->peer_rmbe_size,
 115
 116                         .rx_prod.wrap = conn->local_rx_ctrl.prod.wrap,
 117                         .rx_prod.count = conn->local_rx_ctrl.prod.count,
 118                         .rx_cons.wrap = conn->local_rx_ctrl.cons.wrap,
 119                         .rx_cons.count = conn->local_rx_ctrl.cons.count,
 120
 121                         .tx_prod.wrap = conn->local_tx_ctrl.prod.wrap,
 122                         .tx_prod.count = conn->local_tx_ctrl.prod.count,
 123                         .tx_cons.wrap = conn->local_tx_ctrl.cons.wrap,
 124                         .tx_cons.count = conn->local_tx_ctrl.cons.count,
 125
 126                         .tx_prod_flags =
 127                                 *(u8 *)&conn->local_tx_ctrl.prod_flags,
 128                         .tx_conn_state_flags =
 129                                 *(u8 *)&conn->local_tx_ctrl.conn_state_flags,
 130                         .rx_prod_flags = *(u8 *)&conn->local_rx_ctrl.prod_flags,
 131                         .rx_conn_state_flags =
 132                                 *(u8 *)&conn->local_rx_ctrl.conn_state_flags,
 133
 134                         .tx_prep.wrap = conn->tx_curs_prep.wrap,
 135                         .tx_prep.count = conn->tx_curs_prep.count,
 136                         .tx_sent.wrap = conn->tx_curs_sent.wrap,
 137                         .tx_sent.count = conn->tx_curs_sent.count,
 138                         .tx_fin.wrap = conn->tx_curs_fin.wrap,
 139                         .tx_fin.count = conn->tx_curs_fin.count,
 140                 };
 141
 142                 if (nla_put(skb, SMC_DIAG_CONNINFO, sizeof(cinfo), &cinfo) < 0)
 143                         goto errout;
 144         }
 145
 146         if (smc_conn_lgr_valid(&smc->conn) && !smc->conn.lgr->is_smcd &&
 147             (req->diag_ext & (1 << (SMC_DIAG_LGRINFO - 1))) &&
 148             !list_empty(&smc->conn.lgr->list)) {
 149                 struct smc_link *link = smc->conn.lnk;
 150
 151                 struct smc_diag_lgrinfo linfo = {
 152                         .role = smc->conn.lgr->role,
 153                         .lnk[0].ibport = link->ibport,
 154                         .lnk[0].link_id = link->link_id,
 155                 };
 156
 157                 memcpy(linfo.lnk[0].ibname, link->smcibdev->ibdev->name,
 158                        sizeof(link->smcibdev->ibdev->name));
 159                 smc_gid_be16_convert(linfo.lnk[0].gid, link->gid);
 160                 smc_gid_be16_convert(linfo.lnk[0].peer_gid, link->peer_gid);
 161
 162                 if (nla_put(skb, SMC_DIAG_LGRINFO, sizeof(linfo), &linfo) < 0)
 163                         goto errout;
 164         }
 165         if (smc_conn_lgr_valid(&smc->conn) && 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                 struct smcd_dev *smcd = conn->lgr->smcd;
 171                 struct smcd_gid smcd_gid;
 172
 173                 memset(&dinfo, 0, sizeof(dinfo));
 174
 175                 dinfo.linkid = *((u32 *)conn->lgr->id);
 176                 dinfo.peer_gid = conn->lgr->peer_gid.gid;
 177                 dinfo.peer_gid_ext = conn->lgr->peer_gid.gid_ext;
 178                 smcd->ops->get_local_gid(smcd, &smcd_gid);
 179                 dinfo.my_gid = smcd_gid.gid;
 180                 dinfo.my_gid_ext = smcd_gid.gid_ext;
 181                 dinfo.token = conn->rmb_desc->token;
 182                 dinfo.peer_token = conn->peer_token;
 183
 184                 if (nla_put(skb, SMC_DIAG_DMBINFO, sizeof(dinfo), &dinfo) < 0)
 185                         goto errout;
 186         }
 187
 188         nlmsg_end(skb, nlh);
 189         return 0;
 190
 191 errout:
 192         nlmsg_cancel(skb, nlh);
 193         return -EMSGSIZE;
 194 }
 195
 196 static int smc_diag_dump_proto(struct proto *prot, struct sk_buff *skb,
 197                                struct netlink_callback *cb, int p_type)
 198 {
 199         struct smc_diag_dump_ctx *cb_ctx = smc_dump_context(cb);
 200         struct net *net = sock_net(skb->sk);
 201         int snum = cb_ctx->pos[p_type];
 202         struct nlattr *bc = NULL;
 203         struct hlist_head *head;
 204         int rc = 0, num = 0;
 205         struct sock *sk;
 206
 207         read_lock(&prot->h.smc_hash->lock);
 208         head = &prot->h.smc_hash->ht;
 209         if (hlist_empty(head))
 210                 goto out;
 211
 212         sk_for_each(sk, head) {
 213                 if (!net_eq(sock_net(sk), net))
 214                         continue;
 215                 if (num < snum)
 216                         goto next;
 217                 rc = __smc_diag_dump(sk, skb, cb, nlmsg_data(cb->nlh), bc);
 218                 if (rc < 0)
 219                         goto out;
 220 next:
 221                 num++;
 222         }
 223
 224 out:
 225         read_unlock(&prot->h.smc_hash->lock);
 226         cb_ctx->pos[p_type] = num;
 227         return rc;
 228 }
 229
 230 static int smc_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
 231 {
 232         int rc = 0;
 233
 234         rc = smc_diag_dump_proto(&smc_proto, skb, cb, SMCPROTO_SMC);
 235         if (!rc)
 236                 smc_diag_dump_proto(&smc_proto6, skb, cb, SMCPROTO_SMC6);
 237         return skb->len;
 238 }
 239
 240 static int smc_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
 241 {
 242         struct net *net = sock_net(skb->sk);
 243
 244         if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
 245             h->nlmsg_flags & NLM_F_DUMP) {
 246                 {
 247                         struct netlink_dump_control c = {
 248                                 .dump = smc_diag_dump,
 249                                 .min_dump_alloc = SKB_WITH_OVERHEAD(32768),
 250                         };
 251                         return netlink_dump_start(net->diag_nlsk, skb, h, &c);
 252                 }
 253         }
 254         return 0;
 255 }
 256
 257 static const struct sock_diag_handler smc_diag_handler = {
 258         .family = AF_SMC,
 259         .dump = smc_diag_handler_dump,
 260 };
 261
 262 static int __init smc_diag_init(void)
 263 {
 264         return sock_diag_register(&smc_diag_handler);
 265 }
 266
 267 static void __exit smc_diag_exit(void)
 268 {
 269         sock_diag_unregister(&smc_diag_handler);
 270 }
 271
 272 module_init(smc_diag_init);
 273 module_exit(smc_diag_exit);
 274 MODULE_LICENSE("GPL");
 275 MODULE_DESCRIPTION("SMC socket monitoring via SOCK_DIAG");
 276 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 43 /* AF_SMC */);
 277 MODULE_ALIAS_GENL_FAMILY(SMCR_GENL_FAMILY_NAME);