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_gid_be16_convert(__u8 *buf, u8 *gid_raw)
  35 {
  36         sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x",
  37                 be16_to_cpu(((__be16 *)gid_raw)[0]),
  38                 be16_to_cpu(((__be16 *)gid_raw)[1]),
  39                 be16_to_cpu(((__be16 *)gid_raw)[2]),
  40                 be16_to_cpu(((__be16 *)gid_raw)[3]),
  41                 be16_to_cpu(((__be16 *)gid_raw)[4]),
  42                 be16_to_cpu(((__be16 *)gid_raw)[5]),
  43                 be16_to_cpu(((__be16 *)gid_raw)[6]),
  44                 be16_to_cpu(((__be16 *)gid_raw)[7]));
  45 }
  46
  47 static void smc_diag_msg_common_fill(struct smc_diag_msg *r, struct sock *sk)
  48 {
  49         struct smc_sock *smc = smc_sk(sk);
  50
  51         memset(r, 0, sizeof(*r));
  52         r->diag_family = sk->sk_family;
  53         sock_diag_save_cookie(sk, r->id.idiag_cookie);
  54         if (!smc->clcsock)
  55                 return;
  56         r->id.idiag_sport = htons(smc->clcsock->sk->sk_num);
  57         r->id.idiag_dport = smc->clcsock->sk->sk_dport;
  58         r->id.idiag_if = smc->clcsock->sk->sk_bound_dev_if;
  59         if (sk->sk_protocol == SMCPROTO_SMC) {
  60                 r->id.idiag_src[0] = smc->clcsock->sk->sk_rcv_saddr;
  61                 r->id.idiag_dst[0] = smc->clcsock->sk->sk_daddr;
  62 #if IS_ENABLED(CONFIG_IPV6)
  63         } else if (sk->sk_protocol == SMCPROTO_SMC6) {
  64                 memcpy(&r->id.idiag_src, &smc->clcsock->sk->sk_v6_rcv_saddr,
  65                        sizeof(smc->clcsock->sk->sk_v6_rcv_saddr));
  66                 memcpy(&r->id.idiag_dst, &smc->clcsock->sk->sk_v6_daddr,
  67                        sizeof(smc->clcsock->sk->sk_v6_daddr));
  68 #endif
  69         }
  70 }
  71
  72 static int smc_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
  73                                    struct smc_diag_msg *r,
  74                                    struct user_namespace *user_ns)
  75 {
  76         if (nla_put_u8(skb, SMC_DIAG_SHUTDOWN, sk->sk_shutdown))
  77                 return 1;
  78
  79         r->diag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
  80         r->diag_inode = sock_i_ino(sk);
  81         return 0;
  82 }
  83
  84 static int __smc_diag_dump(struct sock *sk, struct sk_buff *skb,
  85                            struct netlink_callback *cb,
  86                            const struct smc_diag_req *req,
  87                            struct nlattr *bc)
  88 {
  89         struct smc_sock *smc = smc_sk(sk);
  90         struct smc_diag_fallback fallback;
  91         struct user_namespace *user_ns;
  92         struct smc_diag_msg *r;
  93         struct nlmsghdr *nlh;
  94
  95         nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
  96                         cb->nlh->nlmsg_type, sizeof(*r), NLM_F_MULTI);
  97         if (!nlh)
  98                 return -EMSGSIZE;
  99
 100         r = nlmsg_data(nlh);
 101         smc_diag_msg_common_fill(r, sk);
 102         r->diag_state = sk->sk_state;
 103         if (smc->use_fallback)
 104                 r->diag_mode = SMC_DIAG_MODE_FALLBACK_TCP;
 105         else if (smc->conn.lgr && smc->conn.lgr->is_smcd)
 106                 r->diag_mode = SMC_DIAG_MODE_SMCD;
 107         else
 108                 r->diag_mode = SMC_DIAG_MODE_SMCR;
 109         user_ns = sk_user_ns(NETLINK_CB(cb->skb).sk);
 110         if (smc_diag_msg_attrs_fill(sk, skb, r, user_ns))
 111                 goto errout;
 112
 113         fallback.reason = smc->fallback_rsn;
 114         fallback.peer_diagnosis = smc->peer_diagnosis;
 115         if (nla_put(skb, SMC_DIAG_FALLBACK, sizeof(fallback), &fallback) < 0)
 116                 goto errout;
 117
 118         if ((req->diag_ext & (1 << (SMC_DIAG_CONNINFO - 1))) &&
 119             smc->conn.alert_token_local) {
 120                 struct smc_connection *conn = &smc->conn;
 121                 struct smc_diag_conninfo cinfo = {
 122                         .token = conn->alert_token_local,
 123                         .sndbuf_size = conn->sndbuf_desc ?
 124                                 conn->sndbuf_desc->len : 0,
 125                         .rmbe_size = conn->rmb_desc ? conn->rmb_desc->len : 0,
 126                         .peer_rmbe_size = conn->peer_rmbe_size,
 127
 128                         .rx_prod.wrap = conn->local_rx_ctrl.prod.wrap,
 129                         .rx_prod.count = conn->local_rx_ctrl.prod.count,
 130                         .rx_cons.wrap = conn->local_rx_ctrl.cons.wrap,
 131                         .rx_cons.count = conn->local_rx_ctrl.cons.count,
 132
 133                         .tx_prod.wrap = conn->local_tx_ctrl.prod.wrap,
 134                         .tx_prod.count = conn->local_tx_ctrl.prod.count,
 135                         .tx_cons.wrap = conn->local_tx_ctrl.cons.wrap,
 136                         .tx_cons.count = conn->local_tx_ctrl.cons.count,
 137
 138                         .tx_prod_flags =
 139                                 *(u8 *)&conn->local_tx_ctrl.prod_flags,
 140                         .tx_conn_state_flags =
 141                                 *(u8 *)&conn->local_tx_ctrl.conn_state_flags,
 142                         .rx_prod_flags = *(u8 *)&conn->local_rx_ctrl.prod_flags,
 143                         .rx_conn_state_flags =
 144                                 *(u8 *)&conn->local_rx_ctrl.conn_state_flags,
 145
 146                         .tx_prep.wrap = conn->tx_curs_prep.wrap,
 147                         .tx_prep.count = conn->tx_curs_prep.count,
 148                         .tx_sent.wrap = conn->tx_curs_sent.wrap,
 149                         .tx_sent.count = conn->tx_curs_sent.count,
 150                         .tx_fin.wrap = conn->tx_curs_fin.wrap,
 151                         .tx_fin.count = conn->tx_curs_fin.count,
 152                 };
 153
 154                 if (nla_put(skb, SMC_DIAG_CONNINFO, sizeof(cinfo), &cinfo) < 0)
 155                         goto errout;
 156         }
 157
 158         if (smc->conn.lgr && !smc->conn.lgr->is_smcd &&
 159             (req->diag_ext & (1 << (SMC_DIAG_LGRINFO - 1))) &&
 160             !list_empty(&smc->conn.lgr->list)) {
 161                 struct smc_diag_lgrinfo linfo = {
 162                         .role = smc->conn.lgr->role,
 163                         .lnk[0].ibport = smc->conn.lgr->lnk[0].ibport,
 164                         .lnk[0].link_id = smc->conn.lgr->lnk[0].link_id,
 165                 };
 166
 167                 memcpy(linfo.lnk[0].ibname,
 168                        smc->conn.lgr->lnk[0].smcibdev->ibdev->name,
 169                        sizeof(smc->conn.lgr->lnk[0].smcibdev->ibdev->name));
 170                 smc_gid_be16_convert(linfo.lnk[0].gid,
 171                                      smc->conn.lgr->lnk[0].gid);
 172                 smc_gid_be16_convert(linfo.lnk[0].peer_gid,
 173                                      smc->conn.lgr->lnk[0].peer_gid);
 174
 175                 if (nla_put(skb, SMC_DIAG_LGRINFO, sizeof(linfo), &linfo) < 0)
 176                         goto errout;
 177         }
 178         if (smc->conn.lgr && smc->conn.lgr->is_smcd &&
 179             (req->diag_ext & (1 << (SMC_DIAG_DMBINFO - 1))) &&
 180             !list_empty(&smc->conn.lgr->list)) {
 181                 struct smc_connection *conn = &smc->conn;
 182                 struct smcd_diag_dmbinfo dinfo;
 183
 184                 memset(&dinfo, 0, sizeof(dinfo));
 185
 186                 dinfo.linkid = *((u32 *)conn->lgr->id);
 187                 dinfo.peer_gid = conn->lgr->peer_gid;
 188                 dinfo.my_gid = conn->lgr->smcd->local_gid;
 189                 dinfo.token = conn->rmb_desc->token;
 190                 dinfo.peer_token = conn->peer_token;
 191
 192                 if (nla_put(skb, SMC_DIAG_DMBINFO, sizeof(dinfo), &dinfo) < 0)
 193                         goto errout;
 194         }
 195
 196         nlmsg_end(skb, nlh);
 197         return 0;
 198
 199 errout:
 200         nlmsg_cancel(skb, nlh);
 201         return -EMSGSIZE;
 202 }
 203
 204 static int smc_diag_dump_proto(struct proto *prot, struct sk_buff *skb,
 205                                struct netlink_callback *cb, int p_type)
 206 {
 207         struct smc_diag_dump_ctx *cb_ctx = smc_dump_context(cb);
 208         struct net *net = sock_net(skb->sk);
 209         int snum = cb_ctx->pos[p_type];
 210         struct nlattr *bc = NULL;
 211         struct hlist_head *head;
 212         int rc = 0, num = 0;
 213         struct sock *sk;
 214
 215         read_lock(&prot->h.smc_hash->lock);
 216         head = &prot->h.smc_hash->ht;
 217         if (hlist_empty(head))
 218                 goto out;
 219
 220         sk_for_each(sk, head) {
 221                 if (!net_eq(sock_net(sk), net))
 222                         continue;
 223                 if (num < snum)
 224                         goto next;
 225                 rc = __smc_diag_dump(sk, skb, cb, nlmsg_data(cb->nlh), bc);
 226                 if (rc < 0)
 227                         goto out;
 228 next:
 229                 num++;
 230         }
 231
 232 out:
 233         read_unlock(&prot->h.smc_hash->lock);
 234         cb_ctx->pos[p_type] = num;
 235         return rc;
 236 }
 237
 238 static int smc_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
 239 {
 240         int rc = 0;
 241
 242         rc = smc_diag_dump_proto(&smc_proto, skb, cb, SMCPROTO_SMC);
 243         if (!rc)
 244                 smc_diag_dump_proto(&smc_proto6, skb, cb, SMCPROTO_SMC6);
 245         return skb->len;
 246 }
 247
 248 static int smc_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
 249 {
 250         struct net *net = sock_net(skb->sk);
 251
 252         if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
 253             h->nlmsg_flags & NLM_F_DUMP) {
 254                 {
 255                         struct netlink_dump_control c = {
 256                                 .dump = smc_diag_dump,
 257                                 .min_dump_alloc = SKB_WITH_OVERHEAD(32768),
 258                         };
 259                         return netlink_dump_start(net->diag_nlsk, skb, h, &c);
 260                 }
 261         }
 262         return 0;
 263 }
 264
 265 static const struct sock_diag_handler smc_diag_handler = {
 266         .family = AF_SMC,
 267         .dump = smc_diag_handler_dump,
 268 };
 269
 270 static int __init smc_diag_init(void)
 271 {
 272         return sock_diag_register(&smc_diag_handler);
 273 }
 274
 275 static void __exit smc_diag_exit(void)
 276 {
 277         sock_diag_unregister(&smc_diag_handler);
 278 }
 279
 280 module_init(smc_diag_init);
 281 module_exit(smc_diag_exit);
 282 MODULE_LICENSE("GPL");
 283 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 43 /* AF_SMC */);