1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Shared Memory Communications over RDMA (SMC-R) and RoCE 4 * 5 * CLC (connection layer control) handshake over initial TCP socket to 6 * prepare for RDMA traffic 7 * 8 * Copyright IBM Corp. 2016, 2018 9 * 10 * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com> 11 */ 12 13 #include <linux/in.h> 14 #include <linux/inetdevice.h> 15 #include <linux/if_ether.h> 16 #include <linux/sched/signal.h> 17 #include <linux/utsname.h> 18 #include <linux/ctype.h> 19 20 #include <net/addrconf.h> 21 #include <net/sock.h> 22 #include <net/tcp.h> 23 24 #include "smc.h" 25 #include "smc_core.h" 26 #include "smc_clc.h" 27 #include "smc_ib.h" 28 #include "smc_ism.h" 29 30 #define SMCR_CLC_ACCEPT_CONFIRM_LEN 68 31 #define SMCD_CLC_ACCEPT_CONFIRM_LEN 48 32 #define SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 78 33 #define SMC_CLC_RECV_BUF_LEN 100 34 35 /* eye catcher "SMCR" EBCDIC for CLC messages */ 36 static const char SMC_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xd9'}; 37 /* eye catcher "SMCD" EBCDIC for CLC messages */ 38 static const char SMCD_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xc4'}; 39 40 static u8 smc_hostname[SMC_MAX_HOSTNAME_LEN]; 41 42 /* check arriving CLC proposal */ 43 static bool smc_clc_msg_prop_valid(struct smc_clc_msg_proposal *pclc) 44 { 45 struct smc_clc_msg_proposal_prefix *pclc_prfx; 46 struct smc_clc_smcd_v2_extension *smcd_v2_ext; 47 struct smc_clc_msg_hdr *hdr = &pclc->hdr; 48 struct smc_clc_v2_extension *v2_ext; 49 50 v2_ext = smc_get_clc_v2_ext(pclc); 51 pclc_prfx = smc_clc_proposal_get_prefix(pclc); 52 if (hdr->version == SMC_V1) { 53 if (hdr->typev1 == SMC_TYPE_N) 54 return false; 55 if (ntohs(hdr->length) != 56 sizeof(*pclc) + ntohs(pclc->iparea_offset) + 57 sizeof(*pclc_prfx) + 58 pclc_prfx->ipv6_prefixes_cnt * 59 sizeof(struct smc_clc_ipv6_prefix) + 60 sizeof(struct smc_clc_msg_trail)) 61 return false; 62 } else { 63 if (ntohs(hdr->length) != 64 sizeof(*pclc) + 65 sizeof(struct smc_clc_msg_smcd) + 66 (hdr->typev1 != SMC_TYPE_N ? 67 sizeof(*pclc_prfx) + 68 pclc_prfx->ipv6_prefixes_cnt * 69 sizeof(struct smc_clc_ipv6_prefix) : 0) + 70 (hdr->typev2 != SMC_TYPE_N ? 71 sizeof(*v2_ext) + 72 v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN : 0) + 73 (smcd_indicated(hdr->typev2) ? 74 sizeof(*smcd_v2_ext) + v2_ext->hdr.ism_gid_cnt * 75 sizeof(struct smc_clc_smcd_gid_chid) : 76 0) + 77 sizeof(struct smc_clc_msg_trail)) 78 return false; 79 } 80 return true; 81 } 82 83 /* check arriving CLC accept or confirm */ 84 static bool 85 smc_clc_msg_acc_conf_valid(struct smc_clc_msg_accept_confirm_v2 *clc_v2) 86 { 87 struct smc_clc_msg_hdr *hdr = &clc_v2->hdr; 88 89 if (hdr->typev1 != SMC_TYPE_R && hdr->typev1 != SMC_TYPE_D) 90 return false; 91 if (hdr->version == SMC_V1) { 92 if ((hdr->typev1 == SMC_TYPE_R && 93 ntohs(hdr->length) != SMCR_CLC_ACCEPT_CONFIRM_LEN) || 94 (hdr->typev1 == SMC_TYPE_D && 95 ntohs(hdr->length) != SMCD_CLC_ACCEPT_CONFIRM_LEN)) 96 return false; 97 } else { 98 if (hdr->typev1 == SMC_TYPE_D && 99 ntohs(hdr->length) != SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 && 100 (ntohs(hdr->length) != SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 + 101 sizeof(struct smc_clc_first_contact_ext))) 102 return false; 103 } 104 return true; 105 } 106 107 static void smc_clc_fill_fce(struct smc_clc_first_contact_ext *fce, int *len) 108 { 109 memset(fce, 0, sizeof(*fce)); 110 fce->os_type = SMC_CLC_OS_LINUX; 111 fce->release = SMC_RELEASE; 112 memcpy(fce->hostname, smc_hostname, sizeof(smc_hostname)); 113 (*len) += sizeof(*fce); 114 } 115 116 /* check if received message has a correct header length and contains valid 117 * heading and trailing eyecatchers 118 */ 119 static bool smc_clc_msg_hdr_valid(struct smc_clc_msg_hdr *clcm, bool check_trl) 120 { 121 struct smc_clc_msg_accept_confirm_v2 *clc_v2; 122 struct smc_clc_msg_proposal *pclc; 123 struct smc_clc_msg_decline *dclc; 124 struct smc_clc_msg_trail *trl; 125 126 if (memcmp(clcm->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) && 127 memcmp(clcm->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER))) 128 return false; 129 switch (clcm->type) { 130 case SMC_CLC_PROPOSAL: 131 pclc = (struct smc_clc_msg_proposal *)clcm; 132 if (!smc_clc_msg_prop_valid(pclc)) 133 return false; 134 trl = (struct smc_clc_msg_trail *) 135 ((u8 *)pclc + ntohs(pclc->hdr.length) - sizeof(*trl)); 136 break; 137 case SMC_CLC_ACCEPT: 138 case SMC_CLC_CONFIRM: 139 clc_v2 = (struct smc_clc_msg_accept_confirm_v2 *)clcm; 140 if (!smc_clc_msg_acc_conf_valid(clc_v2)) 141 return false; 142 trl = (struct smc_clc_msg_trail *) 143 ((u8 *)clc_v2 + ntohs(clc_v2->hdr.length) - 144 sizeof(*trl)); 145 break; 146 case SMC_CLC_DECLINE: 147 dclc = (struct smc_clc_msg_decline *)clcm; 148 if (ntohs(dclc->hdr.length) != sizeof(*dclc)) 149 return false; 150 trl = &dclc->trl; 151 break; 152 default: 153 return false; 154 } 155 if (check_trl && 156 memcmp(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) && 157 memcmp(trl->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER))) 158 return false; 159 return true; 160 } 161 162 /* find ipv4 addr on device and get the prefix len, fill CLC proposal msg */ 163 static int smc_clc_prfx_set4_rcu(struct dst_entry *dst, __be32 ipv4, 164 struct smc_clc_msg_proposal_prefix *prop) 165 { 166 struct in_device *in_dev = __in_dev_get_rcu(dst->dev); 167 const struct in_ifaddr *ifa; 168 169 if (!in_dev) 170 return -ENODEV; 171 172 in_dev_for_each_ifa_rcu(ifa, in_dev) { 173 if (!inet_ifa_match(ipv4, ifa)) 174 continue; 175 prop->prefix_len = inet_mask_len(ifa->ifa_mask); 176 prop->outgoing_subnet = ifa->ifa_address & ifa->ifa_mask; 177 /* prop->ipv6_prefixes_cnt = 0; already done by memset before */ 178 return 0; 179 } 180 return -ENOENT; 181 } 182 183 /* fill CLC proposal msg with ipv6 prefixes from device */ 184 static int smc_clc_prfx_set6_rcu(struct dst_entry *dst, 185 struct smc_clc_msg_proposal_prefix *prop, 186 struct smc_clc_ipv6_prefix *ipv6_prfx) 187 { 188 #if IS_ENABLED(CONFIG_IPV6) 189 struct inet6_dev *in6_dev = __in6_dev_get(dst->dev); 190 struct inet6_ifaddr *ifa; 191 int cnt = 0; 192 193 if (!in6_dev) 194 return -ENODEV; 195 /* use a maximum of 8 IPv6 prefixes from device */ 196 list_for_each_entry(ifa, &in6_dev->addr_list, if_list) { 197 if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL) 198 continue; 199 ipv6_addr_prefix(&ipv6_prfx[cnt].prefix, 200 &ifa->addr, ifa->prefix_len); 201 ipv6_prfx[cnt].prefix_len = ifa->prefix_len; 202 cnt++; 203 if (cnt == SMC_CLC_MAX_V6_PREFIX) 204 break; 205 } 206 prop->ipv6_prefixes_cnt = cnt; 207 if (cnt) 208 return 0; 209 #endif 210 return -ENOENT; 211 } 212 213 /* retrieve and set prefixes in CLC proposal msg */ 214 static int smc_clc_prfx_set(struct socket *clcsock, 215 struct smc_clc_msg_proposal_prefix *prop, 216 struct smc_clc_ipv6_prefix *ipv6_prfx) 217 { 218 struct dst_entry *dst = sk_dst_get(clcsock->sk); 219 struct sockaddr_storage addrs; 220 struct sockaddr_in6 *addr6; 221 struct sockaddr_in *addr; 222 int rc = -ENOENT; 223 224 if (!dst) { 225 rc = -ENOTCONN; 226 goto out; 227 } 228 if (!dst->dev) { 229 rc = -ENODEV; 230 goto out_rel; 231 } 232 /* get address to which the internal TCP socket is bound */ 233 kernel_getsockname(clcsock, (struct sockaddr *)&addrs); 234 /* analyze IP specific data of net_device belonging to TCP socket */ 235 addr6 = (struct sockaddr_in6 *)&addrs; 236 rcu_read_lock(); 237 if (addrs.ss_family == PF_INET) { 238 /* IPv4 */ 239 addr = (struct sockaddr_in *)&addrs; 240 rc = smc_clc_prfx_set4_rcu(dst, addr->sin_addr.s_addr, prop); 241 } else if (ipv6_addr_v4mapped(&addr6->sin6_addr)) { 242 /* mapped IPv4 address - peer is IPv4 only */ 243 rc = smc_clc_prfx_set4_rcu(dst, addr6->sin6_addr.s6_addr32[3], 244 prop); 245 } else { 246 /* IPv6 */ 247 rc = smc_clc_prfx_set6_rcu(dst, prop, ipv6_prfx); 248 } 249 rcu_read_unlock(); 250 out_rel: 251 dst_release(dst); 252 out: 253 return rc; 254 } 255 256 /* match ipv4 addrs of dev against addr in CLC proposal */ 257 static int smc_clc_prfx_match4_rcu(struct net_device *dev, 258 struct smc_clc_msg_proposal_prefix *prop) 259 { 260 struct in_device *in_dev = __in_dev_get_rcu(dev); 261 const struct in_ifaddr *ifa; 262 263 if (!in_dev) 264 return -ENODEV; 265 in_dev_for_each_ifa_rcu(ifa, in_dev) { 266 if (prop->prefix_len == inet_mask_len(ifa->ifa_mask) && 267 inet_ifa_match(prop->outgoing_subnet, ifa)) 268 return 0; 269 } 270 271 return -ENOENT; 272 } 273 274 /* match ipv6 addrs of dev against addrs in CLC proposal */ 275 static int smc_clc_prfx_match6_rcu(struct net_device *dev, 276 struct smc_clc_msg_proposal_prefix *prop) 277 { 278 #if IS_ENABLED(CONFIG_IPV6) 279 struct inet6_dev *in6_dev = __in6_dev_get(dev); 280 struct smc_clc_ipv6_prefix *ipv6_prfx; 281 struct inet6_ifaddr *ifa; 282 int i, max; 283 284 if (!in6_dev) 285 return -ENODEV; 286 /* ipv6 prefix list starts behind smc_clc_msg_proposal_prefix */ 287 ipv6_prfx = (struct smc_clc_ipv6_prefix *)((u8 *)prop + sizeof(*prop)); 288 max = min_t(u8, prop->ipv6_prefixes_cnt, SMC_CLC_MAX_V6_PREFIX); 289 list_for_each_entry(ifa, &in6_dev->addr_list, if_list) { 290 if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL) 291 continue; 292 for (i = 0; i < max; i++) { 293 if (ifa->prefix_len == ipv6_prfx[i].prefix_len && 294 ipv6_prefix_equal(&ifa->addr, &ipv6_prfx[i].prefix, 295 ifa->prefix_len)) 296 return 0; 297 } 298 } 299 #endif 300 return -ENOENT; 301 } 302 303 /* check if proposed prefixes match one of our device prefixes */ 304 int smc_clc_prfx_match(struct socket *clcsock, 305 struct smc_clc_msg_proposal_prefix *prop) 306 { 307 struct dst_entry *dst = sk_dst_get(clcsock->sk); 308 int rc; 309 310 if (!dst) { 311 rc = -ENOTCONN; 312 goto out; 313 } 314 if (!dst->dev) { 315 rc = -ENODEV; 316 goto out_rel; 317 } 318 rcu_read_lock(); 319 if (!prop->ipv6_prefixes_cnt) 320 rc = smc_clc_prfx_match4_rcu(dst->dev, prop); 321 else 322 rc = smc_clc_prfx_match6_rcu(dst->dev, prop); 323 rcu_read_unlock(); 324 out_rel: 325 dst_release(dst); 326 out: 327 return rc; 328 } 329 330 /* Wait for data on the tcp-socket, analyze received data 331 * Returns: 332 * 0 if success and it was not a decline that we received. 333 * SMC_CLC_DECL_REPLY if decline received for fallback w/o another decl send. 334 * clcsock error, -EINTR, -ECONNRESET, -EPROTO otherwise. 335 */ 336 int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen, 337 u8 expected_type, unsigned long timeout) 338 { 339 long rcvtimeo = smc->clcsock->sk->sk_rcvtimeo; 340 struct sock *clc_sk = smc->clcsock->sk; 341 struct smc_clc_msg_hdr *clcm = buf; 342 struct msghdr msg = {NULL, 0}; 343 int reason_code = 0; 344 struct kvec vec = {buf, buflen}; 345 int len, datlen, recvlen; 346 bool check_trl = true; 347 int krflags; 348 349 /* peek the first few bytes to determine length of data to receive 350 * so we don't consume any subsequent CLC message or payload data 351 * in the TCP byte stream 352 */ 353 /* 354 * Caller must make sure that buflen is no less than 355 * sizeof(struct smc_clc_msg_hdr) 356 */ 357 krflags = MSG_PEEK | MSG_WAITALL; 358 clc_sk->sk_rcvtimeo = timeout; 359 iov_iter_kvec(&msg.msg_iter, READ, &vec, 1, 360 sizeof(struct smc_clc_msg_hdr)); 361 len = sock_recvmsg(smc->clcsock, &msg, krflags); 362 if (signal_pending(current)) { 363 reason_code = -EINTR; 364 clc_sk->sk_err = EINTR; 365 smc->sk.sk_err = EINTR; 366 goto out; 367 } 368 if (clc_sk->sk_err) { 369 reason_code = -clc_sk->sk_err; 370 if (clc_sk->sk_err == EAGAIN && 371 expected_type == SMC_CLC_DECLINE) 372 clc_sk->sk_err = 0; /* reset for fallback usage */ 373 else 374 smc->sk.sk_err = clc_sk->sk_err; 375 goto out; 376 } 377 if (!len) { /* peer has performed orderly shutdown */ 378 smc->sk.sk_err = ECONNRESET; 379 reason_code = -ECONNRESET; 380 goto out; 381 } 382 if (len < 0) { 383 if (len != -EAGAIN || expected_type != SMC_CLC_DECLINE) 384 smc->sk.sk_err = -len; 385 reason_code = len; 386 goto out; 387 } 388 datlen = ntohs(clcm->length); 389 if ((len < sizeof(struct smc_clc_msg_hdr)) || 390 (clcm->version < SMC_V1) || 391 ((clcm->type != SMC_CLC_DECLINE) && 392 (clcm->type != expected_type))) { 393 smc->sk.sk_err = EPROTO; 394 reason_code = -EPROTO; 395 goto out; 396 } 397 398 /* receive the complete CLC message */ 399 memset(&msg, 0, sizeof(struct msghdr)); 400 if (datlen > buflen) { 401 check_trl = false; 402 recvlen = buflen; 403 } else { 404 recvlen = datlen; 405 } 406 iov_iter_kvec(&msg.msg_iter, READ, &vec, 1, recvlen); 407 krflags = MSG_WAITALL; 408 len = sock_recvmsg(smc->clcsock, &msg, krflags); 409 if (len < recvlen || !smc_clc_msg_hdr_valid(clcm, check_trl)) { 410 smc->sk.sk_err = EPROTO; 411 reason_code = -EPROTO; 412 goto out; 413 } 414 datlen -= len; 415 while (datlen) { 416 u8 tmp[SMC_CLC_RECV_BUF_LEN]; 417 418 vec.iov_base = &tmp; 419 vec.iov_len = SMC_CLC_RECV_BUF_LEN; 420 /* receive remaining proposal message */ 421 recvlen = datlen > SMC_CLC_RECV_BUF_LEN ? 422 SMC_CLC_RECV_BUF_LEN : datlen; 423 iov_iter_kvec(&msg.msg_iter, READ, &vec, 1, recvlen); 424 len = sock_recvmsg(smc->clcsock, &msg, krflags); 425 datlen -= len; 426 } 427 if (clcm->type == SMC_CLC_DECLINE) { 428 struct smc_clc_msg_decline *dclc; 429 430 dclc = (struct smc_clc_msg_decline *)clcm; 431 reason_code = SMC_CLC_DECL_PEERDECL; 432 smc->peer_diagnosis = ntohl(dclc->peer_diagnosis); 433 if (((struct smc_clc_msg_decline *)buf)->hdr.typev2 & 434 SMC_FIRST_CONTACT_MASK) { 435 smc->conn.lgr->sync_err = 1; 436 smc_lgr_terminate_sched(smc->conn.lgr); 437 } 438 } 439 440 out: 441 clc_sk->sk_rcvtimeo = rcvtimeo; 442 return reason_code; 443 } 444 445 /* send CLC DECLINE message across internal TCP socket */ 446 int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info, u8 version) 447 { 448 struct smc_clc_msg_decline dclc; 449 struct msghdr msg; 450 struct kvec vec; 451 int len; 452 453 memset(&dclc, 0, sizeof(dclc)); 454 memcpy(dclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)); 455 dclc.hdr.type = SMC_CLC_DECLINE; 456 dclc.hdr.length = htons(sizeof(struct smc_clc_msg_decline)); 457 dclc.hdr.version = version; 458 dclc.os_type = version == SMC_V1 ? 0 : SMC_CLC_OS_LINUX; 459 dclc.hdr.typev2 = (peer_diag_info == SMC_CLC_DECL_SYNCERR) ? 460 SMC_FIRST_CONTACT_MASK : 0; 461 if ((!smc->conn.lgr || !smc->conn.lgr->is_smcd) && 462 smc_ib_is_valid_local_systemid()) 463 memcpy(dclc.id_for_peer, local_systemid, 464 sizeof(local_systemid)); 465 dclc.peer_diagnosis = htonl(peer_diag_info); 466 memcpy(dclc.trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)); 467 468 memset(&msg, 0, sizeof(msg)); 469 vec.iov_base = &dclc; 470 vec.iov_len = sizeof(struct smc_clc_msg_decline); 471 len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1, 472 sizeof(struct smc_clc_msg_decline)); 473 if (len < 0 || len < sizeof(struct smc_clc_msg_decline)) 474 len = -EPROTO; 475 return len > 0 ? 0 : len; 476 } 477 478 /* send CLC PROPOSAL message across internal TCP socket */ 479 int smc_clc_send_proposal(struct smc_sock *smc, struct smc_init_info *ini) 480 { 481 struct smc_clc_smcd_v2_extension *smcd_v2_ext; 482 struct smc_clc_msg_proposal_prefix *pclc_prfx; 483 struct smc_clc_msg_proposal *pclc_base; 484 struct smc_clc_smcd_gid_chid *gidchids; 485 struct smc_clc_msg_proposal_area *pclc; 486 struct smc_clc_ipv6_prefix *ipv6_prfx; 487 struct smc_clc_v2_extension *v2_ext; 488 struct smc_clc_msg_smcd *pclc_smcd; 489 struct smc_clc_msg_trail *trl; 490 int len, i, plen, rc; 491 int reason_code = 0; 492 struct kvec vec[8]; 493 struct msghdr msg; 494 495 pclc = kzalloc(sizeof(*pclc), GFP_KERNEL); 496 if (!pclc) 497 return -ENOMEM; 498 499 pclc_base = &pclc->pclc_base; 500 pclc_smcd = &pclc->pclc_smcd; 501 pclc_prfx = &pclc->pclc_prfx; 502 ipv6_prfx = pclc->pclc_prfx_ipv6; 503 v2_ext = &pclc->pclc_v2_ext; 504 smcd_v2_ext = &pclc->pclc_smcd_v2_ext; 505 gidchids = pclc->pclc_gidchids; 506 trl = &pclc->pclc_trl; 507 508 pclc_base->hdr.version = SMC_V2; 509 pclc_base->hdr.typev1 = ini->smc_type_v1; 510 pclc_base->hdr.typev2 = ini->smc_type_v2; 511 plen = sizeof(*pclc_base) + sizeof(*pclc_smcd) + sizeof(*trl); 512 513 /* retrieve ip prefixes for CLC proposal msg */ 514 if (ini->smc_type_v1 != SMC_TYPE_N) { 515 rc = smc_clc_prfx_set(smc->clcsock, pclc_prfx, ipv6_prfx); 516 if (rc) { 517 if (ini->smc_type_v2 == SMC_TYPE_N) { 518 kfree(pclc); 519 return SMC_CLC_DECL_CNFERR; 520 } 521 pclc_base->hdr.typev1 = SMC_TYPE_N; 522 } else { 523 pclc_base->iparea_offset = htons(sizeof(*pclc_smcd)); 524 plen += sizeof(*pclc_prfx) + 525 pclc_prfx->ipv6_prefixes_cnt * 526 sizeof(ipv6_prfx[0]); 527 } 528 } 529 530 /* build SMC Proposal CLC message */ 531 memcpy(pclc_base->hdr.eyecatcher, SMC_EYECATCHER, 532 sizeof(SMC_EYECATCHER)); 533 pclc_base->hdr.type = SMC_CLC_PROPOSAL; 534 if (smcr_indicated(ini->smc_type_v1)) { 535 /* add SMC-R specifics */ 536 memcpy(pclc_base->lcl.id_for_peer, local_systemid, 537 sizeof(local_systemid)); 538 memcpy(pclc_base->lcl.gid, ini->ib_gid, SMC_GID_SIZE); 539 memcpy(pclc_base->lcl.mac, &ini->ib_dev->mac[ini->ib_port - 1], 540 ETH_ALEN); 541 } 542 if (smcd_indicated(ini->smc_type_v1)) { 543 /* add SMC-D specifics */ 544 if (ini->ism_dev[0]) { 545 pclc_smcd->ism.gid = htonll(ini->ism_dev[0]->local_gid); 546 pclc_smcd->ism.chid = 547 htons(smc_ism_get_chid(ini->ism_dev[0])); 548 } 549 } 550 if (ini->smc_type_v2 == SMC_TYPE_N) { 551 pclc_smcd->v2_ext_offset = 0; 552 } else { 553 u16 v2_ext_offset; 554 u8 *eid = NULL; 555 556 v2_ext_offset = sizeof(*pclc_smcd) - 557 offsetofend(struct smc_clc_msg_smcd, v2_ext_offset); 558 if (ini->smc_type_v1 != SMC_TYPE_N) 559 v2_ext_offset += sizeof(*pclc_prfx) + 560 pclc_prfx->ipv6_prefixes_cnt * 561 sizeof(ipv6_prfx[0]); 562 pclc_smcd->v2_ext_offset = htons(v2_ext_offset); 563 v2_ext->hdr.eid_cnt = 0; 564 v2_ext->hdr.ism_gid_cnt = ini->ism_offered_cnt; 565 v2_ext->hdr.flag.release = SMC_RELEASE; 566 v2_ext->hdr.flag.seid = 1; 567 v2_ext->hdr.smcd_v2_ext_offset = htons(sizeof(*v2_ext) - 568 offsetofend(struct smc_clnt_opts_area_hdr, 569 smcd_v2_ext_offset) + 570 v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN); 571 if (ini->ism_dev[0]) 572 smc_ism_get_system_eid(ini->ism_dev[0], &eid); 573 else 574 smc_ism_get_system_eid(ini->ism_dev[1], &eid); 575 if (eid) 576 memcpy(smcd_v2_ext->system_eid, eid, SMC_MAX_EID_LEN); 577 plen += sizeof(*v2_ext) + sizeof(*smcd_v2_ext); 578 if (ini->ism_offered_cnt) { 579 for (i = 1; i <= ini->ism_offered_cnt; i++) { 580 gidchids[i - 1].gid = 581 htonll(ini->ism_dev[i]->local_gid); 582 gidchids[i - 1].chid = 583 htons(smc_ism_get_chid(ini->ism_dev[i])); 584 } 585 plen += ini->ism_offered_cnt * 586 sizeof(struct smc_clc_smcd_gid_chid); 587 } 588 } 589 pclc_base->hdr.length = htons(plen); 590 memcpy(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)); 591 592 /* send SMC Proposal CLC message */ 593 memset(&msg, 0, sizeof(msg)); 594 i = 0; 595 vec[i].iov_base = pclc_base; 596 vec[i++].iov_len = sizeof(*pclc_base); 597 vec[i].iov_base = pclc_smcd; 598 vec[i++].iov_len = sizeof(*pclc_smcd); 599 if (ini->smc_type_v1 != SMC_TYPE_N) { 600 vec[i].iov_base = pclc_prfx; 601 vec[i++].iov_len = sizeof(*pclc_prfx); 602 if (pclc_prfx->ipv6_prefixes_cnt > 0) { 603 vec[i].iov_base = ipv6_prfx; 604 vec[i++].iov_len = pclc_prfx->ipv6_prefixes_cnt * 605 sizeof(ipv6_prfx[0]); 606 } 607 } 608 if (ini->smc_type_v2 != SMC_TYPE_N) { 609 vec[i].iov_base = v2_ext; 610 vec[i++].iov_len = sizeof(*v2_ext); 611 vec[i].iov_base = smcd_v2_ext; 612 vec[i++].iov_len = sizeof(*smcd_v2_ext); 613 if (ini->ism_offered_cnt) { 614 vec[i].iov_base = gidchids; 615 vec[i++].iov_len = ini->ism_offered_cnt * 616 sizeof(struct smc_clc_smcd_gid_chid); 617 } 618 } 619 vec[i].iov_base = trl; 620 vec[i++].iov_len = sizeof(*trl); 621 /* due to the few bytes needed for clc-handshake this cannot block */ 622 len = kernel_sendmsg(smc->clcsock, &msg, vec, i, plen); 623 if (len < 0) { 624 smc->sk.sk_err = smc->clcsock->sk->sk_err; 625 reason_code = -smc->sk.sk_err; 626 } else if (len < ntohs(pclc_base->hdr.length)) { 627 reason_code = -ENETUNREACH; 628 smc->sk.sk_err = -reason_code; 629 } 630 631 kfree(pclc); 632 return reason_code; 633 } 634 635 /* build and send CLC CONFIRM / ACCEPT message */ 636 static int smc_clc_send_confirm_accept(struct smc_sock *smc, 637 struct smc_clc_msg_accept_confirm_v2 *clc_v2, 638 int first_contact, u8 version) 639 { 640 struct smc_connection *conn = &smc->conn; 641 struct smc_clc_msg_accept_confirm *clc; 642 struct smc_clc_first_contact_ext fce; 643 struct smc_clc_msg_trail trl; 644 struct kvec vec[3]; 645 struct msghdr msg; 646 int i, len; 647 648 /* send SMC Confirm CLC msg */ 649 clc = (struct smc_clc_msg_accept_confirm *)clc_v2; 650 clc->hdr.version = version; /* SMC version */ 651 if (first_contact) 652 clc->hdr.typev2 |= SMC_FIRST_CONTACT_MASK; 653 if (conn->lgr->is_smcd) { 654 /* SMC-D specific settings */ 655 memcpy(clc->hdr.eyecatcher, SMCD_EYECATCHER, 656 sizeof(SMCD_EYECATCHER)); 657 clc->hdr.typev1 = SMC_TYPE_D; 658 clc->d0.gid = conn->lgr->smcd->local_gid; 659 clc->d0.token = conn->rmb_desc->token; 660 clc->d0.dmbe_size = conn->rmbe_size_short; 661 clc->d0.dmbe_idx = 0; 662 memcpy(&clc->d0.linkid, conn->lgr->id, SMC_LGR_ID_SIZE); 663 if (version == SMC_V1) { 664 clc->hdr.length = htons(SMCD_CLC_ACCEPT_CONFIRM_LEN); 665 } else { 666 u8 *eid = NULL; 667 668 clc_v2->chid = htons(smc_ism_get_chid(conn->lgr->smcd)); 669 smc_ism_get_system_eid(conn->lgr->smcd, &eid); 670 if (eid) 671 memcpy(clc_v2->eid, eid, SMC_MAX_EID_LEN); 672 len = SMCD_CLC_ACCEPT_CONFIRM_LEN_V2; 673 if (first_contact) 674 smc_clc_fill_fce(&fce, &len); 675 clc_v2->hdr.length = htons(len); 676 } 677 memcpy(trl.eyecatcher, SMCD_EYECATCHER, 678 sizeof(SMCD_EYECATCHER)); 679 } else { 680 struct smc_link *link = conn->lnk; 681 682 /* SMC-R specific settings */ 683 link = conn->lnk; 684 memcpy(clc->hdr.eyecatcher, SMC_EYECATCHER, 685 sizeof(SMC_EYECATCHER)); 686 clc->hdr.typev1 = SMC_TYPE_R; 687 clc->hdr.length = htons(SMCR_CLC_ACCEPT_CONFIRM_LEN); 688 memcpy(clc->r0.lcl.id_for_peer, local_systemid, 689 sizeof(local_systemid)); 690 memcpy(&clc->r0.lcl.gid, link->gid, SMC_GID_SIZE); 691 memcpy(&clc->r0.lcl.mac, &link->smcibdev->mac[link->ibport - 1], 692 ETH_ALEN); 693 hton24(clc->r0.qpn, link->roce_qp->qp_num); 694 clc->r0.rmb_rkey = 695 htonl(conn->rmb_desc->mr_rx[link->link_idx]->rkey); 696 clc->r0.rmbe_idx = 1; /* for now: 1 RMB = 1 RMBE */ 697 clc->r0.rmbe_alert_token = htonl(conn->alert_token_local); 698 switch (clc->hdr.type) { 699 case SMC_CLC_ACCEPT: 700 clc->r0.qp_mtu = link->path_mtu; 701 break; 702 case SMC_CLC_CONFIRM: 703 clc->r0.qp_mtu = min(link->path_mtu, link->peer_mtu); 704 break; 705 } 706 clc->r0.rmbe_size = conn->rmbe_size_short; 707 clc->r0.rmb_dma_addr = cpu_to_be64((u64)sg_dma_address 708 (conn->rmb_desc->sgt[link->link_idx].sgl)); 709 hton24(clc->r0.psn, link->psn_initial); 710 memcpy(trl.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)); 711 } 712 713 memset(&msg, 0, sizeof(msg)); 714 i = 0; 715 vec[i].iov_base = clc_v2; 716 if (version > SMC_V1) 717 vec[i++].iov_len = SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 - sizeof(trl); 718 else 719 vec[i++].iov_len = (clc->hdr.typev1 == SMC_TYPE_D ? 720 SMCD_CLC_ACCEPT_CONFIRM_LEN : 721 SMCR_CLC_ACCEPT_CONFIRM_LEN) - 722 sizeof(trl); 723 if (version > SMC_V1 && first_contact) { 724 vec[i].iov_base = &fce; 725 vec[i++].iov_len = sizeof(fce); 726 } 727 vec[i].iov_base = &trl; 728 vec[i++].iov_len = sizeof(trl); 729 return kernel_sendmsg(smc->clcsock, &msg, vec, 1, 730 ntohs(clc->hdr.length)); 731 } 732 733 /* send CLC CONFIRM message across internal TCP socket */ 734 int smc_clc_send_confirm(struct smc_sock *smc, bool clnt_first_contact, 735 u8 version) 736 { 737 struct smc_clc_msg_accept_confirm_v2 cclc_v2; 738 int reason_code = 0; 739 int len; 740 741 /* send SMC Confirm CLC msg */ 742 memset(&cclc_v2, 0, sizeof(cclc_v2)); 743 cclc_v2.hdr.type = SMC_CLC_CONFIRM; 744 len = smc_clc_send_confirm_accept(smc, &cclc_v2, clnt_first_contact, 745 version); 746 if (len < ntohs(cclc_v2.hdr.length)) { 747 if (len >= 0) { 748 reason_code = -ENETUNREACH; 749 smc->sk.sk_err = -reason_code; 750 } else { 751 smc->sk.sk_err = smc->clcsock->sk->sk_err; 752 reason_code = -smc->sk.sk_err; 753 } 754 } 755 return reason_code; 756 } 757 758 /* send CLC ACCEPT message across internal TCP socket */ 759 int smc_clc_send_accept(struct smc_sock *new_smc, bool srv_first_contact, 760 u8 version) 761 { 762 struct smc_clc_msg_accept_confirm_v2 aclc_v2; 763 int len; 764 765 memset(&aclc_v2, 0, sizeof(aclc_v2)); 766 aclc_v2.hdr.type = SMC_CLC_ACCEPT; 767 len = smc_clc_send_confirm_accept(new_smc, &aclc_v2, srv_first_contact, 768 version); 769 if (len < ntohs(aclc_v2.hdr.length)) 770 len = len >= 0 ? -EPROTO : -new_smc->clcsock->sk->sk_err; 771 772 return len > 0 ? 0 : len; 773 } 774 775 void smc_clc_get_hostname(u8 **host) 776 { 777 *host = &smc_hostname[0]; 778 } 779 780 void __init smc_clc_init(void) 781 { 782 struct new_utsname *u; 783 784 memset(smc_hostname, _S, sizeof(smc_hostname)); /* ASCII blanks */ 785 u = utsname(); 786 memcpy(smc_hostname, u->nodename, 787 min_t(size_t, strlen(u->nodename), sizeof(smc_hostname))); 788 } 789