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