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))) && 90 smc->conn.alert_token_local) { 91 struct smc_connection *conn = &smc->conn; 92 struct smc_diag_conninfo cinfo = { 93 .token = conn->alert_token_local, 94 .sndbuf_size = conn->sndbuf_size, 95 .rmbe_size = conn->rmbe_size, 96 .peer_rmbe_size = conn->peer_rmbe_size, 97 98 .rx_prod.wrap = conn->local_rx_ctrl.prod.wrap, 99 .rx_prod.count = conn->local_rx_ctrl.prod.count, 100 .rx_cons.wrap = conn->local_rx_ctrl.cons.wrap, 101 .rx_cons.count = conn->local_rx_ctrl.cons.count, 102 103 .tx_prod.wrap = conn->local_tx_ctrl.prod.wrap, 104 .tx_prod.count = conn->local_tx_ctrl.prod.count, 105 .tx_cons.wrap = conn->local_tx_ctrl.cons.wrap, 106 .tx_cons.count = conn->local_tx_ctrl.cons.count, 107 108 .tx_prod_flags = 109 *(u8 *)&conn->local_tx_ctrl.prod_flags, 110 .tx_conn_state_flags = 111 *(u8 *)&conn->local_tx_ctrl.conn_state_flags, 112 .rx_prod_flags = *(u8 *)&conn->local_rx_ctrl.prod_flags, 113 .rx_conn_state_flags = 114 *(u8 *)&conn->local_rx_ctrl.conn_state_flags, 115 116 .tx_prep.wrap = conn->tx_curs_prep.wrap, 117 .tx_prep.count = conn->tx_curs_prep.count, 118 .tx_sent.wrap = conn->tx_curs_sent.wrap, 119 .tx_sent.count = conn->tx_curs_sent.count, 120 .tx_fin.wrap = conn->tx_curs_fin.wrap, 121 .tx_fin.count = conn->tx_curs_fin.count, 122 }; 123 124 if (nla_put(skb, SMC_DIAG_CONNINFO, sizeof(cinfo), &cinfo) < 0) 125 goto errout; 126 } 127 128 if ((req->diag_ext & (1 << (SMC_DIAG_LGRINFO - 1))) && smc->conn.lgr && 129 !list_empty(&smc->conn.lgr->list)) { 130 struct smc_diag_lgrinfo linfo = { 131 .role = smc->conn.lgr->role, 132 .lnk[0].ibport = smc->conn.lgr->lnk[0].ibport, 133 .lnk[0].link_id = smc->conn.lgr->lnk[0].link_id, 134 }; 135 136 memcpy(linfo.lnk[0].ibname, 137 smc->conn.lgr->lnk[0].smcibdev->ibdev->name, 138 sizeof(smc->conn.lgr->lnk[0].smcibdev->ibdev->name)); 139 smc_gid_be16_convert(linfo.lnk[0].gid, 140 smc->conn.lgr->lnk[0].gid.raw); 141 smc_gid_be16_convert(linfo.lnk[0].peer_gid, 142 smc->conn.lgr->lnk[0].peer_gid); 143 144 if (nla_put(skb, SMC_DIAG_LGRINFO, sizeof(linfo), &linfo) < 0) 145 goto errout; 146 } 147 148 nlmsg_end(skb, nlh); 149 return 0; 150 151 errout: 152 nlmsg_cancel(skb, nlh); 153 return -EMSGSIZE; 154 } 155 156 static int smc_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 157 { 158 struct net *net = sock_net(skb->sk); 159 struct nlattr *bc = NULL; 160 struct hlist_head *head; 161 struct sock *sk; 162 int rc = 0; 163 164 read_lock(&smc_proto.h.smc_hash->lock); 165 head = &smc_proto.h.smc_hash->ht; 166 if (hlist_empty(head)) 167 goto out; 168 169 sk_for_each(sk, head) { 170 if (!net_eq(sock_net(sk), net)) 171 continue; 172 rc = __smc_diag_dump(sk, skb, cb, nlmsg_data(cb->nlh), bc); 173 if (rc) 174 break; 175 } 176 177 out: 178 read_unlock(&smc_proto.h.smc_hash->lock); 179 return rc; 180 } 181 182 static int smc_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h) 183 { 184 struct net *net = sock_net(skb->sk); 185 186 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY && 187 h->nlmsg_flags & NLM_F_DUMP) { 188 { 189 struct netlink_dump_control c = { 190 .dump = smc_diag_dump, 191 .min_dump_alloc = SKB_WITH_OVERHEAD(32768), 192 }; 193 return netlink_dump_start(net->diag_nlsk, skb, h, &c); 194 } 195 } 196 return 0; 197 } 198 199 static const struct sock_diag_handler smc_diag_handler = { 200 .family = AF_SMC, 201 .dump = smc_diag_handler_dump, 202 }; 203 204 static int __init smc_diag_init(void) 205 { 206 return sock_diag_register(&smc_diag_handler); 207 } 208 209 static void __exit smc_diag_exit(void) 210 { 211 sock_diag_unregister(&smc_diag_handler); 212 } 213 214 module_init(smc_diag_init); 215 module_exit(smc_diag_exit); 216 MODULE_LICENSE("GPL"); 217 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 43 /* AF_SMC */); 218