net/smc/smc_diag.c

   1 /*
   2  * Shared Memory Communications over RDMA (SMC-R) and RoCE
   3  *
   4  * Monitoring SMC transport protocol sockets
   5  *
   6  * Copyright IBM Corp. 2016
   7  *
   8  * Author(s):  Ursula Braun <ubraun@linux.vnet.ibm.com>
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/types.h>
  14 #include <linux/init.h>
  15 #include <linux/sock_diag.h>
  16 #include <linux/inet_diag.h>
  17 #include <linux/smc_diag.h>
  18 #include <net/netlink.h>
  19 #include <net/smc.h>
  20
  21 #include "smc.h"
  22 #include "smc_core.h"
  23
  24 static void smc_gid_be16_convert(__u8 *buf, u8 *gid_raw)
  25 {
  26         sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x",
  27                 be16_to_cpu(((__be16 *)gid_raw)[0]),
  28                 be16_to_cpu(((__be16 *)gid_raw)[1]),
  29                 be16_to_cpu(((__be16 *)gid_raw)[2]),
  30                 be16_to_cpu(((__be16 *)gid_raw)[3]),
  31                 be16_to_cpu(((__be16 *)gid_raw)[4]),
  32                 be16_to_cpu(((__be16 *)gid_raw)[5]),
  33                 be16_to_cpu(((__be16 *)gid_raw)[6]),
  34                 be16_to_cpu(((__be16 *)gid_raw)[7]));
  35 }
  36
  37 static void smc_diag_msg_common_fill(struct smc_diag_msg *r, struct sock *sk)
  38 {
  39         struct smc_sock *smc = smc_sk(sk);
  40
  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         sock_diag_save_cookie(sk, r->id.idiag_cookie);
  47         if (sk->sk_protocol == SMCPROTO_SMC) {
  48                 r->diag_family = PF_INET;
  49                 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
  50                 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
  51                 r->id.idiag_src[0] = smc->clcsock->sk->sk_rcv_saddr;
  52                 r->id.idiag_dst[0] = smc->clcsock->sk->sk_daddr;
  53 #if IS_ENABLED(CONFIG_IPV6)
  54         } else if (sk->sk_protocol == SMCPROTO_SMC6) {
  55                 r->diag_family = PF_INET6;
  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 user_namespace *user_ns;
  83         struct smc_diag_msg *r;
  84         struct nlmsghdr *nlh;
  85
  86         nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
  87                         cb->nlh->nlmsg_type, sizeof(*r), NLM_F_MULTI);
  88         if (!nlh)
  89                 return -EMSGSIZE;
  90
  91         r = nlmsg_data(nlh);
  92         smc_diag_msg_common_fill(r, sk);
  93         r->diag_state = sk->sk_state;
  94         r->diag_fallback = smc->use_fallback;
  95         user_ns = sk_user_ns(NETLINK_CB(cb->skb).sk);
  96         if (smc_diag_msg_attrs_fill(sk, skb, r, user_ns))
  97                 goto errout;
  98
  99         if ((req->diag_ext & (1 << (SMC_DIAG_CONNINFO - 1))) &&
 100             smc->conn.alert_token_local) {
 101                 struct smc_connection *conn = &smc->conn;
 102                 struct smc_diag_conninfo cinfo = {
 103                         .token = conn->alert_token_local,
 104                         .sndbuf_size = conn->sndbuf_desc ?
 105                                 conn->sndbuf_desc->len : 0,
 106                         .rmbe_size = conn->rmb_desc ? conn->rmb_desc->len : 0,
 107                         .peer_rmbe_size = conn->peer_rmbe_size,
 108
 109                         .rx_prod.wrap = conn->local_rx_ctrl.prod.wrap,
 110                         .rx_prod.count = conn->local_rx_ctrl.prod.count,
 111                         .rx_cons.wrap = conn->local_rx_ctrl.cons.wrap,
 112                         .rx_cons.count = conn->local_rx_ctrl.cons.count,
 113
 114                         .tx_prod.wrap = conn->local_tx_ctrl.prod.wrap,
 115                         .tx_prod.count = conn->local_tx_ctrl.prod.count,
 116                         .tx_cons.wrap = conn->local_tx_ctrl.cons.wrap,
 117                         .tx_cons.count = conn->local_tx_ctrl.cons.count,
 118
 119                         .tx_prod_flags =
 120                                 *(u8 *)&conn->local_tx_ctrl.prod_flags,
 121                         .tx_conn_state_flags =
 122                                 *(u8 *)&conn->local_tx_ctrl.conn_state_flags,
 123                         .rx_prod_flags = *(u8 *)&conn->local_rx_ctrl.prod_flags,
 124                         .rx_conn_state_flags =
 125                                 *(u8 *)&conn->local_rx_ctrl.conn_state_flags,
 126
 127                         .tx_prep.wrap = conn->tx_curs_prep.wrap,
 128                         .tx_prep.count = conn->tx_curs_prep.count,
 129                         .tx_sent.wrap = conn->tx_curs_sent.wrap,
 130                         .tx_sent.count = conn->tx_curs_sent.count,
 131                         .tx_fin.wrap = conn->tx_curs_fin.wrap,
 132                         .tx_fin.count = conn->tx_curs_fin.count,
 133                 };
 134
 135                 if (nla_put(skb, SMC_DIAG_CONNINFO, sizeof(cinfo), &cinfo) < 0)
 136                         goto errout;
 137         }
 138
 139         if ((req->diag_ext & (1 << (SMC_DIAG_LGRINFO - 1))) && smc->conn.lgr &&
 140             !list_empty(&smc->conn.lgr->list)) {
 141                 struct smc_diag_lgrinfo linfo = {
 142                         .role = smc->conn.lgr->role,
 143                         .lnk[0].ibport = smc->conn.lgr->lnk[0].ibport,
 144                         .lnk[0].link_id = smc->conn.lgr->lnk[0].link_id,
 145                 };
 146
 147                 memcpy(linfo.lnk[0].ibname,
 148                        smc->conn.lgr->lnk[0].smcibdev->ibdev->name,
 149                        sizeof(smc->conn.lgr->lnk[0].smcibdev->ibdev->name));
 150                 smc_gid_be16_convert(linfo.lnk[0].gid,
 151                                      smc->conn.lgr->lnk[0].gid.raw);
 152                 smc_gid_be16_convert(linfo.lnk[0].peer_gid,
 153                                      smc->conn.lgr->lnk[0].peer_gid);
 154
 155                 if (nla_put(skb, SMC_DIAG_LGRINFO, sizeof(linfo), &linfo) < 0)
 156                         goto errout;
 157         }
 158
 159         nlmsg_end(skb, nlh);
 160         return 0;
 161
 162 errout:
 163         nlmsg_cancel(skb, nlh);
 164         return -EMSGSIZE;
 165 }
 166
 167 static int smc_diag_dump_proto(struct proto *prot, struct sk_buff *skb,
 168                                struct netlink_callback *cb)
 169 {
 170         struct net *net = sock_net(skb->sk);
 171         struct nlattr *bc = NULL;
 172         struct hlist_head *head;
 173         struct sock *sk;
 174         int rc = 0;
 175
 176         read_lock(&prot->h.smc_hash->lock);
 177         head = &prot->h.smc_hash->ht;
 178         if (hlist_empty(head))
 179                 goto out;
 180
 181         sk_for_each(sk, head) {
 182                 if (!net_eq(sock_net(sk), net))
 183                         continue;
 184                 rc = __smc_diag_dump(sk, skb, cb, nlmsg_data(cb->nlh), bc);
 185                 if (rc)
 186                         break;
 187         }
 188
 189 out:
 190         read_unlock(&prot->h.smc_hash->lock);
 191         return rc;
 192 }
 193
 194 static int smc_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
 195 {
 196         int rc = 0;
 197
 198         rc = smc_diag_dump_proto(&smc_proto, skb, cb);
 199         if (!rc)
 200                 rc = smc_diag_dump_proto(&smc_proto6, skb, cb);
 201         return rc;
 202 }
 203
 204 static int smc_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
 205 {
 206         struct net *net = sock_net(skb->sk);
 207
 208         if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
 209             h->nlmsg_flags & NLM_F_DUMP) {
 210                 {
 211                         struct netlink_dump_control c = {
 212                                 .dump = smc_diag_dump,
 213                                 .min_dump_alloc = SKB_WITH_OVERHEAD(32768),
 214                         };
 215                         return netlink_dump_start(net->diag_nlsk, skb, h, &c);
 216                 }
 217         }
 218         return 0;
 219 }
 220
 221 static const struct sock_diag_handler smc_diag_handler = {
 222         .family = AF_SMC,
 223         .dump = smc_diag_handler_dump,
 224 };
 225
 226 static int __init smc_diag_init(void)
 227 {
 228         return sock_diag_register(&smc_diag_handler);
 229 }
 230
 231 static void __exit smc_diag_exit(void)
 232 {
 233         sock_diag_unregister(&smc_diag_handler);
 234 }
 235
 236 module_init(smc_diag_init);
 237 module_exit(smc_diag_exit);
 238 MODULE_LICENSE("GPL");
 239 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 43 /* AF_SMC */);