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 #include "smc_ism.h" 25 26 struct smc_diag_dump_ctx { 27 int pos[2]; 28 }; 29 30 static struct smc_diag_dump_ctx *smc_dump_context(struct netlink_callback *cb) 31 { 32 return (struct smc_diag_dump_ctx *)cb->ctx; 33 } 34 35 static void smc_diag_msg_common_fill(struct smc_diag_msg *r, struct sock *sk) 36 { 37 struct smc_sock *smc = smc_sk(sk); 38 39 memset(r, 0, sizeof(*r)); 40 r->diag_family = sk->sk_family; 41 sock_diag_save_cookie(sk, r->id.idiag_cookie); 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 if (sk->sk_protocol == SMCPROTO_SMC) { 48 r->id.idiag_src[0] = smc->clcsock->sk->sk_rcv_saddr; 49 r->id.idiag_dst[0] = smc->clcsock->sk->sk_daddr; 50 #if IS_ENABLED(CONFIG_IPV6) 51 } else if (sk->sk_protocol == SMCPROTO_SMC6) { 52 memcpy(&r->id.idiag_src, &smc->clcsock->sk->sk_v6_rcv_saddr, 53 sizeof(smc->clcsock->sk->sk_v6_rcv_saddr)); 54 memcpy(&r->id.idiag_dst, &smc->clcsock->sk->sk_v6_daddr, 55 sizeof(smc->clcsock->sk->sk_v6_daddr)); 56 #endif 57 } 58 } 59 60 static int smc_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb, 61 struct smc_diag_msg *r, 62 struct user_namespace *user_ns) 63 { 64 if (nla_put_u8(skb, SMC_DIAG_SHUTDOWN, sk->sk_shutdown)) 65 return 1; 66 67 r->diag_uid = from_kuid_munged(user_ns, sock_i_uid(sk)); 68 r->diag_inode = sock_i_ino(sk); 69 return 0; 70 } 71 72 static int __smc_diag_dump(struct sock *sk, struct sk_buff *skb, 73 struct netlink_callback *cb, 74 const struct smc_diag_req *req, 75 struct nlattr *bc) 76 { 77 struct smc_sock *smc = smc_sk(sk); 78 struct smc_diag_fallback fallback; 79 struct user_namespace *user_ns; 80 struct smc_diag_msg *r; 81 struct nlmsghdr *nlh; 82 83 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 84 cb->nlh->nlmsg_type, sizeof(*r), NLM_F_MULTI); 85 if (!nlh) 86 return -EMSGSIZE; 87 88 r = nlmsg_data(nlh); 89 smc_diag_msg_common_fill(r, sk); 90 r->diag_state = sk->sk_state; 91 if (smc->use_fallback) 92 r->diag_mode = SMC_DIAG_MODE_FALLBACK_TCP; 93 else if (smc_conn_lgr_valid(&smc->conn) && smc->conn.lgr->is_smcd) 94 r->diag_mode = SMC_DIAG_MODE_SMCD; 95 else 96 r->diag_mode = SMC_DIAG_MODE_SMCR; 97 user_ns = sk_user_ns(NETLINK_CB(cb->skb).sk); 98 if (smc_diag_msg_attrs_fill(sk, skb, r, user_ns)) 99 goto errout; 100 101 fallback.reason = smc->fallback_rsn; 102 fallback.peer_diagnosis = smc->peer_diagnosis; 103 if (nla_put(skb, SMC_DIAG_FALLBACK, sizeof(fallback), &fallback) < 0) 104 goto errout; 105 106 if ((req->diag_ext & (1 << (SMC_DIAG_CONNINFO - 1))) && 107 smc->conn.alert_token_local) { 108 struct smc_connection *conn = &smc->conn; 109 struct smc_diag_conninfo cinfo = { 110 .token = conn->alert_token_local, 111 .sndbuf_size = conn->sndbuf_desc ? 112 conn->sndbuf_desc->len : 0, 113 .rmbe_size = conn->rmb_desc ? conn->rmb_desc->len : 0, 114 .peer_rmbe_size = conn->peer_rmbe_size, 115 116 .rx_prod.wrap = conn->local_rx_ctrl.prod.wrap, 117 .rx_prod.count = conn->local_rx_ctrl.prod.count, 118 .rx_cons.wrap = conn->local_rx_ctrl.cons.wrap, 119 .rx_cons.count = conn->local_rx_ctrl.cons.count, 120 121 .tx_prod.wrap = conn->local_tx_ctrl.prod.wrap, 122 .tx_prod.count = conn->local_tx_ctrl.prod.count, 123 .tx_cons.wrap = conn->local_tx_ctrl.cons.wrap, 124 .tx_cons.count = conn->local_tx_ctrl.cons.count, 125 126 .tx_prod_flags = 127 *(u8 *)&conn->local_tx_ctrl.prod_flags, 128 .tx_conn_state_flags = 129 *(u8 *)&conn->local_tx_ctrl.conn_state_flags, 130 .rx_prod_flags = *(u8 *)&conn->local_rx_ctrl.prod_flags, 131 .rx_conn_state_flags = 132 *(u8 *)&conn->local_rx_ctrl.conn_state_flags, 133 134 .tx_prep.wrap = conn->tx_curs_prep.wrap, 135 .tx_prep.count = conn->tx_curs_prep.count, 136 .tx_sent.wrap = conn->tx_curs_sent.wrap, 137 .tx_sent.count = conn->tx_curs_sent.count, 138 .tx_fin.wrap = conn->tx_curs_fin.wrap, 139 .tx_fin.count = conn->tx_curs_fin.count, 140 }; 141 142 if (nla_put(skb, SMC_DIAG_CONNINFO, sizeof(cinfo), &cinfo) < 0) 143 goto errout; 144 } 145 146 if (smc_conn_lgr_valid(&smc->conn) && !smc->conn.lgr->is_smcd && 147 (req->diag_ext & (1 << (SMC_DIAG_LGRINFO - 1))) && 148 !list_empty(&smc->conn.lgr->list)) { 149 struct smc_link *link = smc->conn.lnk; 150 151 struct smc_diag_lgrinfo linfo = { 152 .role = smc->conn.lgr->role, 153 .lnk[0].ibport = link->ibport, 154 .lnk[0].link_id = link->link_id, 155 }; 156 157 memcpy(linfo.lnk[0].ibname, link->smcibdev->ibdev->name, 158 sizeof(link->smcibdev->ibdev->name)); 159 smc_gid_be16_convert(linfo.lnk[0].gid, link->gid); 160 smc_gid_be16_convert(linfo.lnk[0].peer_gid, link->peer_gid); 161 162 if (nla_put(skb, SMC_DIAG_LGRINFO, sizeof(linfo), &linfo) < 0) 163 goto errout; 164 } 165 if (smc_conn_lgr_valid(&smc->conn) && smc->conn.lgr->is_smcd && 166 (req->diag_ext & (1 << (SMC_DIAG_DMBINFO - 1))) && 167 !list_empty(&smc->conn.lgr->list) && smc->conn.rmb_desc) { 168 struct smc_connection *conn = &smc->conn; 169 struct smcd_diag_dmbinfo dinfo; 170 struct smcd_dev *smcd = conn->lgr->smcd; 171 struct smcd_gid smcd_gid; 172 173 memset(&dinfo, 0, sizeof(dinfo)); 174 175 dinfo.linkid = *((u32 *)conn->lgr->id); 176 dinfo.peer_gid = conn->lgr->peer_gid.gid; 177 dinfo.peer_gid_ext = conn->lgr->peer_gid.gid_ext; 178 smcd->ops->get_local_gid(smcd, &smcd_gid); 179 dinfo.my_gid = smcd_gid.gid; 180 dinfo.my_gid_ext = smcd_gid.gid_ext; 181 dinfo.token = conn->rmb_desc->token; 182 dinfo.peer_token = conn->peer_token; 183 184 if (nla_put(skb, SMC_DIAG_DMBINFO, sizeof(dinfo), &dinfo) < 0) 185 goto errout; 186 } 187 188 nlmsg_end(skb, nlh); 189 return 0; 190 191 errout: 192 nlmsg_cancel(skb, nlh); 193 return -EMSGSIZE; 194 } 195 196 static int smc_diag_dump_proto(struct proto *prot, struct sk_buff *skb, 197 struct netlink_callback *cb, int p_type) 198 { 199 struct smc_diag_dump_ctx *cb_ctx = smc_dump_context(cb); 200 struct net *net = sock_net(skb->sk); 201 int snum = cb_ctx->pos[p_type]; 202 struct nlattr *bc = NULL; 203 struct hlist_head *head; 204 int rc = 0, num = 0; 205 struct sock *sk; 206 207 read_lock(&prot->h.smc_hash->lock); 208 head = &prot->h.smc_hash->ht; 209 if (hlist_empty(head)) 210 goto out; 211 212 sk_for_each(sk, head) { 213 if (!net_eq(sock_net(sk), net)) 214 continue; 215 if (num < snum) 216 goto next; 217 rc = __smc_diag_dump(sk, skb, cb, nlmsg_data(cb->nlh), bc); 218 if (rc < 0) 219 goto out; 220 next: 221 num++; 222 } 223 224 out: 225 read_unlock(&prot->h.smc_hash->lock); 226 cb_ctx->pos[p_type] = num; 227 return rc; 228 } 229 230 static int smc_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 231 { 232 int rc = 0; 233 234 rc = smc_diag_dump_proto(&smc_proto, skb, cb, SMCPROTO_SMC); 235 if (!rc) 236 smc_diag_dump_proto(&smc_proto6, skb, cb, SMCPROTO_SMC6); 237 return skb->len; 238 } 239 240 static int smc_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h) 241 { 242 struct net *net = sock_net(skb->sk); 243 244 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY && 245 h->nlmsg_flags & NLM_F_DUMP) { 246 { 247 struct netlink_dump_control c = { 248 .dump = smc_diag_dump, 249 .min_dump_alloc = SKB_WITH_OVERHEAD(32768), 250 }; 251 return netlink_dump_start(net->diag_nlsk, skb, h, &c); 252 } 253 } 254 return 0; 255 } 256 257 static const struct sock_diag_handler smc_diag_handler = { 258 .owner = THIS_MODULE, 259 .family = AF_SMC, 260 .dump = smc_diag_handler_dump, 261 }; 262 263 static int __init smc_diag_init(void) 264 { 265 return sock_diag_register(&smc_diag_handler); 266 } 267 268 static void __exit smc_diag_exit(void) 269 { 270 sock_diag_unregister(&smc_diag_handler); 271 } 272 273 module_init(smc_diag_init); 274 module_exit(smc_diag_exit); 275 MODULE_LICENSE("GPL"); 276 MODULE_DESCRIPTION("SMC socket monitoring via SOCK_DIAG"); 277 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 43 /* AF_SMC */); 278 MODULE_ALIAS_GENL_FAMILY(SMCR_GENL_FAMILY_NAME); 279