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 25 struct smc_diag_dump_ctx { 26 int pos[2]; 27 }; 28 29 static struct smc_diag_dump_ctx *smc_dump_context(struct netlink_callback *cb) 30 { 31 return (struct smc_diag_dump_ctx *)cb->ctx; 32 } 33 34 static void smc_gid_be16_convert(__u8 *buf, u8 *gid_raw) 35 { 36 sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x", 37 be16_to_cpu(((__be16 *)gid_raw)[0]), 38 be16_to_cpu(((__be16 *)gid_raw)[1]), 39 be16_to_cpu(((__be16 *)gid_raw)[2]), 40 be16_to_cpu(((__be16 *)gid_raw)[3]), 41 be16_to_cpu(((__be16 *)gid_raw)[4]), 42 be16_to_cpu(((__be16 *)gid_raw)[5]), 43 be16_to_cpu(((__be16 *)gid_raw)[6]), 44 be16_to_cpu(((__be16 *)gid_raw)[7])); 45 } 46 47 static void smc_diag_msg_common_fill(struct smc_diag_msg *r, struct sock *sk) 48 { 49 struct smc_sock *smc = smc_sk(sk); 50 51 memset(r, 0, sizeof(*r)); 52 r->diag_family = sk->sk_family; 53 sock_diag_save_cookie(sk, r->id.idiag_cookie); 54 if (!smc->clcsock) 55 return; 56 r->id.idiag_sport = htons(smc->clcsock->sk->sk_num); 57 r->id.idiag_dport = smc->clcsock->sk->sk_dport; 58 r->id.idiag_if = smc->clcsock->sk->sk_bound_dev_if; 59 if (sk->sk_protocol == SMCPROTO_SMC) { 60 r->id.idiag_src[0] = smc->clcsock->sk->sk_rcv_saddr; 61 r->id.idiag_dst[0] = smc->clcsock->sk->sk_daddr; 62 #if IS_ENABLED(CONFIG_IPV6) 63 } else if (sk->sk_protocol == SMCPROTO_SMC6) { 64 memcpy(&r->id.idiag_src, &smc->clcsock->sk->sk_v6_rcv_saddr, 65 sizeof(smc->clcsock->sk->sk_v6_rcv_saddr)); 66 memcpy(&r->id.idiag_dst, &smc->clcsock->sk->sk_v6_daddr, 67 sizeof(smc->clcsock->sk->sk_v6_daddr)); 68 #endif 69 } 70 } 71 72 static int smc_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb, 73 struct smc_diag_msg *r, 74 struct user_namespace *user_ns) 75 { 76 if (nla_put_u8(skb, SMC_DIAG_SHUTDOWN, sk->sk_shutdown)) 77 return 1; 78 79 r->diag_uid = from_kuid_munged(user_ns, sock_i_uid(sk)); 80 r->diag_inode = sock_i_ino(sk); 81 return 0; 82 } 83 84 static int __smc_diag_dump(struct sock *sk, struct sk_buff *skb, 85 struct netlink_callback *cb, 86 const struct smc_diag_req *req, 87 struct nlattr *bc) 88 { 89 struct smc_sock *smc = smc_sk(sk); 90 struct smc_diag_fallback fallback; 91 struct user_namespace *user_ns; 92 struct smc_diag_msg *r; 93 struct nlmsghdr *nlh; 94 95 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 96 cb->nlh->nlmsg_type, sizeof(*r), NLM_F_MULTI); 97 if (!nlh) 98 return -EMSGSIZE; 99 100 r = nlmsg_data(nlh); 101 smc_diag_msg_common_fill(r, sk); 102 r->diag_state = sk->sk_state; 103 if (smc->use_fallback) 104 r->diag_mode = SMC_DIAG_MODE_FALLBACK_TCP; 105 else if (smc->conn.lgr && smc->conn.lgr->is_smcd) 106 r->diag_mode = SMC_DIAG_MODE_SMCD; 107 else 108 r->diag_mode = SMC_DIAG_MODE_SMCR; 109 user_ns = sk_user_ns(NETLINK_CB(cb->skb).sk); 110 if (smc_diag_msg_attrs_fill(sk, skb, r, user_ns)) 111 goto errout; 112 113 fallback.reason = smc->fallback_rsn; 114 fallback.peer_diagnosis = smc->peer_diagnosis; 115 if (nla_put(skb, SMC_DIAG_FALLBACK, sizeof(fallback), &fallback) < 0) 116 goto errout; 117 118 if ((req->diag_ext & (1 << (SMC_DIAG_CONNINFO - 1))) && 119 smc->conn.alert_token_local) { 120 struct smc_connection *conn = &smc->conn; 121 struct smc_diag_conninfo cinfo = { 122 .token = conn->alert_token_local, 123 .sndbuf_size = conn->sndbuf_desc ? 124 conn->sndbuf_desc->len : 0, 125 .rmbe_size = conn->rmb_desc ? conn->rmb_desc->len : 0, 126 .peer_rmbe_size = conn->peer_rmbe_size, 127 128 .rx_prod.wrap = conn->local_rx_ctrl.prod.wrap, 129 .rx_prod.count = conn->local_rx_ctrl.prod.count, 130 .rx_cons.wrap = conn->local_rx_ctrl.cons.wrap, 131 .rx_cons.count = conn->local_rx_ctrl.cons.count, 132 133 .tx_prod.wrap = conn->local_tx_ctrl.prod.wrap, 134 .tx_prod.count = conn->local_tx_ctrl.prod.count, 135 .tx_cons.wrap = conn->local_tx_ctrl.cons.wrap, 136 .tx_cons.count = conn->local_tx_ctrl.cons.count, 137 138 .tx_prod_flags = 139 *(u8 *)&conn->local_tx_ctrl.prod_flags, 140 .tx_conn_state_flags = 141 *(u8 *)&conn->local_tx_ctrl.conn_state_flags, 142 .rx_prod_flags = *(u8 *)&conn->local_rx_ctrl.prod_flags, 143 .rx_conn_state_flags = 144 *(u8 *)&conn->local_rx_ctrl.conn_state_flags, 145 146 .tx_prep.wrap = conn->tx_curs_prep.wrap, 147 .tx_prep.count = conn->tx_curs_prep.count, 148 .tx_sent.wrap = conn->tx_curs_sent.wrap, 149 .tx_sent.count = conn->tx_curs_sent.count, 150 .tx_fin.wrap = conn->tx_curs_fin.wrap, 151 .tx_fin.count = conn->tx_curs_fin.count, 152 }; 153 154 if (nla_put(skb, SMC_DIAG_CONNINFO, sizeof(cinfo), &cinfo) < 0) 155 goto errout; 156 } 157 158 if (smc->conn.lgr && !smc->conn.lgr->is_smcd && 159 (req->diag_ext & (1 << (SMC_DIAG_LGRINFO - 1))) && 160 !list_empty(&smc->conn.lgr->list)) { 161 struct smc_diag_lgrinfo linfo = { 162 .role = smc->conn.lgr->role, 163 .lnk[0].ibport = smc->conn.lgr->lnk[0].ibport, 164 .lnk[0].link_id = smc->conn.lgr->lnk[0].link_id, 165 }; 166 167 memcpy(linfo.lnk[0].ibname, 168 smc->conn.lgr->lnk[0].smcibdev->ibdev->name, 169 sizeof(smc->conn.lgr->lnk[0].smcibdev->ibdev->name)); 170 smc_gid_be16_convert(linfo.lnk[0].gid, 171 smc->conn.lgr->lnk[0].gid); 172 smc_gid_be16_convert(linfo.lnk[0].peer_gid, 173 smc->conn.lgr->lnk[0].peer_gid); 174 175 if (nla_put(skb, SMC_DIAG_LGRINFO, sizeof(linfo), &linfo) < 0) 176 goto errout; 177 } 178 if (smc->conn.lgr && smc->conn.lgr->is_smcd && 179 (req->diag_ext & (1 << (SMC_DIAG_DMBINFO - 1))) && 180 !list_empty(&smc->conn.lgr->list)) { 181 struct smc_connection *conn = &smc->conn; 182 struct smcd_diag_dmbinfo dinfo; 183 184 memset(&dinfo, 0, sizeof(dinfo)); 185 186 dinfo.linkid = *((u32 *)conn->lgr->id); 187 dinfo.peer_gid = conn->lgr->peer_gid; 188 dinfo.my_gid = conn->lgr->smcd->local_gid; 189 dinfo.token = conn->rmb_desc->token; 190 dinfo.peer_token = conn->peer_token; 191 192 if (nla_put(skb, SMC_DIAG_DMBINFO, sizeof(dinfo), &dinfo) < 0) 193 goto errout; 194 } 195 196 nlmsg_end(skb, nlh); 197 return 0; 198 199 errout: 200 nlmsg_cancel(skb, nlh); 201 return -EMSGSIZE; 202 } 203 204 static int smc_diag_dump_proto(struct proto *prot, struct sk_buff *skb, 205 struct netlink_callback *cb, int p_type) 206 { 207 struct smc_diag_dump_ctx *cb_ctx = smc_dump_context(cb); 208 struct net *net = sock_net(skb->sk); 209 int snum = cb_ctx->pos[p_type]; 210 struct nlattr *bc = NULL; 211 struct hlist_head *head; 212 int rc = 0, num = 0; 213 struct sock *sk; 214 215 read_lock(&prot->h.smc_hash->lock); 216 head = &prot->h.smc_hash->ht; 217 if (hlist_empty(head)) 218 goto out; 219 220 sk_for_each(sk, head) { 221 if (!net_eq(sock_net(sk), net)) 222 continue; 223 if (num < snum) 224 goto next; 225 rc = __smc_diag_dump(sk, skb, cb, nlmsg_data(cb->nlh), bc); 226 if (rc < 0) 227 goto out; 228 next: 229 num++; 230 } 231 232 out: 233 read_unlock(&prot->h.smc_hash->lock); 234 cb_ctx->pos[p_type] = num; 235 return rc; 236 } 237 238 static int smc_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) 239 { 240 int rc = 0; 241 242 rc = smc_diag_dump_proto(&smc_proto, skb, cb, SMCPROTO_SMC); 243 if (!rc) 244 smc_diag_dump_proto(&smc_proto6, skb, cb, SMCPROTO_SMC6); 245 return skb->len; 246 } 247 248 static int smc_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h) 249 { 250 struct net *net = sock_net(skb->sk); 251 252 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY && 253 h->nlmsg_flags & NLM_F_DUMP) { 254 { 255 struct netlink_dump_control c = { 256 .dump = smc_diag_dump, 257 .min_dump_alloc = SKB_WITH_OVERHEAD(32768), 258 }; 259 return netlink_dump_start(net->diag_nlsk, skb, h, &c); 260 } 261 } 262 return 0; 263 } 264 265 static const struct sock_diag_handler smc_diag_handler = { 266 .family = AF_SMC, 267 .dump = smc_diag_handler_dump, 268 }; 269 270 static int __init smc_diag_init(void) 271 { 272 return sock_diag_register(&smc_diag_handler); 273 } 274 275 static void __exit smc_diag_exit(void) 276 { 277 sock_diag_unregister(&smc_diag_handler); 278 } 279 280 module_init(smc_diag_init); 281 module_exit(smc_diag_exit); 282 MODULE_LICENSE("GPL"); 283 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 43 /* AF_SMC */); 284