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         memset(r, 0, sizeof(*r));
  42         r->diag_family = sk->sk_family;
  43         sock_diag_save_cookie(sk, r->id.idiag_cookie);
  44         if (!smc->clcsock)
  45                 return;
  46         r->id.idiag_sport = htons(smc->clcsock->sk->sk_num);
  47         r->id.idiag_dport = smc->clcsock->sk->sk_dport;
  48         r->id.idiag_if = smc->clcsock->sk->sk_bound_dev_if;
  49         r->id.idiag_src[0] = smc->clcsock->sk->sk_rcv_saddr;
  50         r->id.idiag_dst[0] = smc->clcsock->sk->sk_daddr;
  51 }
  52
  53 static int smc_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
  54                                    struct smc_diag_msg *r,
  55                                    struct user_namespace *user_ns)
  56 {
  57         if (nla_put_u8(skb, SMC_DIAG_SHUTDOWN, sk->sk_shutdown))
  58                 return 1;
  59
  60         r->diag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
  61         r->diag_inode = sock_i_ino(sk);
  62         return 0;
  63 }
  64
  65 static int __smc_diag_dump(struct sock *sk, struct sk_buff *skb,
  66                            struct netlink_callback *cb,
  67                            const struct smc_diag_req *req,
  68                            struct nlattr *bc)
  69 {
  70         struct smc_sock *smc = smc_sk(sk);
  71         struct user_namespace *user_ns;
  72         struct smc_diag_msg *r;
  73         struct nlmsghdr *nlh;
  74
  75         nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
  76                         cb->nlh->nlmsg_type, sizeof(*r), NLM_F_MULTI);
  77         if (!nlh)
  78                 return -EMSGSIZE;
  79
  80         r = nlmsg_data(nlh);
  81         smc_diag_msg_common_fill(r, sk);
  82         r->diag_state = sk->sk_state;
  83         r->diag_fallback = smc->use_fallback;
  84         user_ns = sk_user_ns(NETLINK_CB(cb->skb).sk);
  85         if (smc_diag_msg_attrs_fill(sk, skb, r, user_ns))
  86                 goto errout;
  87
  88         if ((req->diag_ext & (1 << (SMC_DIAG_CONNINFO - 1))) && smc->conn.lgr) {
  89                 struct smc_connection *conn = &smc->conn;
  90                 struct smc_diag_conninfo cinfo = {
  91                         .token = conn->alert_token_local,
  92                         .sndbuf_size = conn->sndbuf_size,
  93                         .rmbe_size = conn->rmbe_size,
  94                         .peer_rmbe_size = conn->peer_rmbe_size,
  95
  96                         .rx_prod.wrap = conn->local_rx_ctrl.prod.wrap,
  97                         .rx_prod.count = conn->local_rx_ctrl.prod.count,
  98                         .rx_cons.wrap = conn->local_rx_ctrl.cons.wrap,
  99                         .rx_cons.count = conn->local_rx_ctrl.cons.count,
 100
 101                         .tx_prod.wrap = conn->local_tx_ctrl.prod.wrap,
 102                         .tx_prod.count = conn->local_tx_ctrl.prod.count,
 103                         .tx_cons.wrap = conn->local_tx_ctrl.cons.wrap,
 104                         .tx_cons.count = conn->local_tx_ctrl.cons.count,
 105
 106                         .tx_prod_flags =
 107                                 *(u8 *)&conn->local_tx_ctrl.prod_flags,
 108                         .tx_conn_state_flags =
 109                                 *(u8 *)&conn->local_tx_ctrl.conn_state_flags,
 110                         .rx_prod_flags = *(u8 *)&conn->local_rx_ctrl.prod_flags,
 111                         .rx_conn_state_flags =
 112                                 *(u8 *)&conn->local_rx_ctrl.conn_state_flags,
 113
 114                         .tx_prep.wrap = conn->tx_curs_prep.wrap,
 115                         .tx_prep.count = conn->tx_curs_prep.count,
 116                         .tx_sent.wrap = conn->tx_curs_sent.wrap,
 117                         .tx_sent.count = conn->tx_curs_sent.count,
 118                         .tx_fin.wrap = conn->tx_curs_fin.wrap,
 119                         .tx_fin.count = conn->tx_curs_fin.count,
 120                 };
 121
 122                 if (nla_put(skb, SMC_DIAG_CONNINFO, sizeof(cinfo), &cinfo) < 0)
 123                         goto errout;
 124         }
 125
 126         if ((req->diag_ext & (1 << (SMC_DIAG_LGRINFO - 1))) && smc->conn.lgr) {
 127                 struct smc_diag_lgrinfo linfo = {
 128                         .role = smc->conn.lgr->role,
 129                         .lnk[0].ibport = smc->conn.lgr->lnk[0].ibport,
 130                         .lnk[0].link_id = smc->conn.lgr->lnk[0].link_id,
 131                 };
 132
 133                 memcpy(linfo.lnk[0].ibname,
 134                        smc->conn.lgr->lnk[0].smcibdev->ibdev->name,
 135                        sizeof(smc->conn.lgr->lnk[0].smcibdev->ibdev->name));
 136                 smc_gid_be16_convert(linfo.lnk[0].gid,
 137                                      smc->conn.lgr->lnk[0].gid.raw);
 138                 smc_gid_be16_convert(linfo.lnk[0].peer_gid,
 139                                      smc->conn.lgr->lnk[0].peer_gid);
 140
 141                 if (nla_put(skb, SMC_DIAG_LGRINFO, sizeof(linfo), &linfo) < 0)
 142                         goto errout;
 143         }
 144
 145         nlmsg_end(skb, nlh);
 146         return 0;
 147
 148 errout:
 149         nlmsg_cancel(skb, nlh);
 150         return -EMSGSIZE;
 151 }
 152
 153 static int smc_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
 154 {
 155         struct net *net = sock_net(skb->sk);
 156         struct nlattr *bc = NULL;
 157         struct hlist_head *head;
 158         struct sock *sk;
 159         int rc = 0;
 160
 161         read_lock(&smc_proto.h.smc_hash->lock);
 162         head = &smc_proto.h.smc_hash->ht;
 163         if (hlist_empty(head))
 164                 goto out;
 165
 166         sk_for_each(sk, head) {
 167                 if (!net_eq(sock_net(sk), net))
 168                         continue;
 169                 rc = __smc_diag_dump(sk, skb, cb, nlmsg_data(cb->nlh), bc);
 170                 if (rc)
 171                         break;
 172         }
 173
 174 out:
 175         read_unlock(&smc_proto.h.smc_hash->lock);
 176         return rc;
 177 }
 178
 179 static int smc_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
 180 {
 181         struct net *net = sock_net(skb->sk);
 182
 183         if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
 184             h->nlmsg_flags & NLM_F_DUMP) {
 185                 {
 186                         struct netlink_dump_control c = {
 187                                 .dump = smc_diag_dump,
 188                                 .min_dump_alloc = SKB_WITH_OVERHEAD(32768),
 189                         };
 190                         return netlink_dump_start(net->diag_nlsk, skb, h, &c);
 191                 }
 192         }
 193         return 0;
 194 }
 195
 196 static const struct sock_diag_handler smc_diag_handler = {
 197         .family = AF_SMC,
 198         .dump = smc_diag_handler_dump,
 199 };
 200
 201 static int __init smc_diag_init(void)
 202 {
 203         return sock_diag_register(&smc_diag_handler);
 204 }
 205
 206 static void __exit smc_diag_exit(void)
 207 {
 208         sock_diag_unregister(&smc_diag_handler);
 209 }
 210
 211 module_init(smc_diag_init);
 212 module_exit(smc_diag_exit);
 213 MODULE_LICENSE("GPL");
 214 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 43 /* AF_SMC */);