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 #include "smc_netlink.h" 30 31 #define SMCR_CLC_ACCEPT_CONFIRM_LEN 68 32 #define SMCD_CLC_ACCEPT_CONFIRM_LEN 48 33 #define SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 78 34 #define SMCR_CLC_ACCEPT_CONFIRM_LEN_V2 108 35 #define SMC_CLC_RECV_BUF_LEN 100 36 37 /* eye catcher "SMCR" EBCDIC for CLC messages */ 38 static const char SMC_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xd9'}; 39 /* eye catcher "SMCD" EBCDIC for CLC messages */ 40 static const char SMCD_EYECATCHER[4] = {'\xe2', '\xd4', '\xc3', '\xc4'}; 41 42 static u8 smc_hostname[SMC_MAX_HOSTNAME_LEN]; 43 44 struct smc_clc_eid_table { 45 rwlock_t lock; 46 struct list_head list; 47 u8 ueid_cnt; 48 u8 seid_enabled; 49 }; 50 51 static struct smc_clc_eid_table smc_clc_eid_table; 52 53 struct smc_clc_eid_entry { 54 struct list_head list; 55 u8 eid[SMC_MAX_EID_LEN]; 56 }; 57 58 /* The size of a user EID is 32 characters. 59 * Valid characters should be (single-byte character set) A-Z, 0-9, '.' and '-'. 60 * Blanks should only be used to pad to the expected size. 61 * First character must be alphanumeric. 62 */ 63 static bool smc_clc_ueid_valid(char *ueid) 64 { 65 char *end = ueid + SMC_MAX_EID_LEN; 66 67 while (--end >= ueid && isspace(*end)) 68 ; 69 if (end < ueid) 70 return false; 71 if (!isalnum(*ueid) || islower(*ueid)) 72 return false; 73 while (ueid <= end) { 74 if ((!isalnum(*ueid) || islower(*ueid)) && *ueid != '.' && 75 *ueid != '-') 76 return false; 77 ueid++; 78 } 79 return true; 80 } 81 82 static int smc_clc_ueid_add(char *ueid) 83 { 84 struct smc_clc_eid_entry *new_ueid, *tmp_ueid; 85 int rc; 86 87 if (!smc_clc_ueid_valid(ueid)) 88 return -EINVAL; 89 90 /* add a new ueid entry to the ueid table if there isn't one */ 91 new_ueid = kzalloc(sizeof(*new_ueid), GFP_KERNEL); 92 if (!new_ueid) 93 return -ENOMEM; 94 memcpy(new_ueid->eid, ueid, SMC_MAX_EID_LEN); 95 96 write_lock(&smc_clc_eid_table.lock); 97 if (smc_clc_eid_table.ueid_cnt >= SMC_MAX_UEID) { 98 rc = -ERANGE; 99 goto err_out; 100 } 101 list_for_each_entry(tmp_ueid, &smc_clc_eid_table.list, list) { 102 if (!memcmp(tmp_ueid->eid, ueid, SMC_MAX_EID_LEN)) { 103 rc = -EEXIST; 104 goto err_out; 105 } 106 } 107 list_add_tail(&new_ueid->list, &smc_clc_eid_table.list); 108 smc_clc_eid_table.ueid_cnt++; 109 write_unlock(&smc_clc_eid_table.lock); 110 return 0; 111 112 err_out: 113 write_unlock(&smc_clc_eid_table.lock); 114 kfree(new_ueid); 115 return rc; 116 } 117 118 int smc_clc_ueid_count(void) 119 { 120 int count; 121 122 read_lock(&smc_clc_eid_table.lock); 123 count = smc_clc_eid_table.ueid_cnt; 124 read_unlock(&smc_clc_eid_table.lock); 125 126 return count; 127 } 128 129 int smc_nl_add_ueid(struct sk_buff *skb, struct genl_info *info) 130 { 131 struct nlattr *nla_ueid = info->attrs[SMC_NLA_EID_TABLE_ENTRY]; 132 char *ueid; 133 134 if (!nla_ueid || nla_len(nla_ueid) != SMC_MAX_EID_LEN + 1) 135 return -EINVAL; 136 ueid = (char *)nla_data(nla_ueid); 137 138 return smc_clc_ueid_add(ueid); 139 } 140 141 /* remove one or all ueid entries from the table */ 142 static int smc_clc_ueid_remove(char *ueid) 143 { 144 struct smc_clc_eid_entry *lst_ueid, *tmp_ueid; 145 int rc = -ENOENT; 146 147 /* remove table entry */ 148 write_lock(&smc_clc_eid_table.lock); 149 list_for_each_entry_safe(lst_ueid, tmp_ueid, &smc_clc_eid_table.list, 150 list) { 151 if (!ueid || !memcmp(lst_ueid->eid, ueid, SMC_MAX_EID_LEN)) { 152 list_del(&lst_ueid->list); 153 smc_clc_eid_table.ueid_cnt--; 154 kfree(lst_ueid); 155 rc = 0; 156 } 157 } 158 #if IS_ENABLED(CONFIG_S390) 159 if (!rc && !smc_clc_eid_table.ueid_cnt) { 160 smc_clc_eid_table.seid_enabled = 1; 161 rc = -EAGAIN; /* indicate success and enabling of seid */ 162 } 163 #endif 164 write_unlock(&smc_clc_eid_table.lock); 165 return rc; 166 } 167 168 int smc_nl_remove_ueid(struct sk_buff *skb, struct genl_info *info) 169 { 170 struct nlattr *nla_ueid = info->attrs[SMC_NLA_EID_TABLE_ENTRY]; 171 char *ueid; 172 173 if (!nla_ueid || nla_len(nla_ueid) != SMC_MAX_EID_LEN + 1) 174 return -EINVAL; 175 ueid = (char *)nla_data(nla_ueid); 176 177 return smc_clc_ueid_remove(ueid); 178 } 179 180 int smc_nl_flush_ueid(struct sk_buff *skb, struct genl_info *info) 181 { 182 smc_clc_ueid_remove(NULL); 183 return 0; 184 } 185 186 static int smc_nl_ueid_dumpinfo(struct sk_buff *skb, u32 portid, u32 seq, 187 u32 flags, char *ueid) 188 { 189 char ueid_str[SMC_MAX_EID_LEN + 1]; 190 void *hdr; 191 192 hdr = genlmsg_put(skb, portid, seq, &smc_gen_nl_family, 193 flags, SMC_NETLINK_DUMP_UEID); 194 if (!hdr) 195 return -ENOMEM; 196 memcpy(ueid_str, ueid, SMC_MAX_EID_LEN); 197 ueid_str[SMC_MAX_EID_LEN] = 0; 198 if (nla_put_string(skb, SMC_NLA_EID_TABLE_ENTRY, ueid_str)) { 199 genlmsg_cancel(skb, hdr); 200 return -EMSGSIZE; 201 } 202 genlmsg_end(skb, hdr); 203 return 0; 204 } 205 206 static int _smc_nl_ueid_dump(struct sk_buff *skb, u32 portid, u32 seq, 207 int start_idx) 208 { 209 struct smc_clc_eid_entry *lst_ueid; 210 int idx = 0; 211 212 read_lock(&smc_clc_eid_table.lock); 213 list_for_each_entry(lst_ueid, &smc_clc_eid_table.list, list) { 214 if (idx++ < start_idx) 215 continue; 216 if (smc_nl_ueid_dumpinfo(skb, portid, seq, NLM_F_MULTI, 217 lst_ueid->eid)) { 218 --idx; 219 break; 220 } 221 } 222 read_unlock(&smc_clc_eid_table.lock); 223 return idx; 224 } 225 226 int smc_nl_dump_ueid(struct sk_buff *skb, struct netlink_callback *cb) 227 { 228 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); 229 int idx; 230 231 idx = _smc_nl_ueid_dump(skb, NETLINK_CB(cb->skb).portid, 232 cb->nlh->nlmsg_seq, cb_ctx->pos[0]); 233 234 cb_ctx->pos[0] = idx; 235 return skb->len; 236 } 237 238 int smc_nl_dump_seid(struct sk_buff *skb, struct netlink_callback *cb) 239 { 240 struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb); 241 char seid_str[SMC_MAX_EID_LEN + 1]; 242 u8 seid_enabled; 243 void *hdr; 244 u8 *seid; 245 246 if (cb_ctx->pos[0]) 247 return skb->len; 248 249 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 250 &smc_gen_nl_family, NLM_F_MULTI, 251 SMC_NETLINK_DUMP_SEID); 252 if (!hdr) 253 return -ENOMEM; 254 if (!smc_ism_is_v2_capable()) 255 goto end; 256 257 smc_ism_get_system_eid(&seid); 258 memcpy(seid_str, seid, SMC_MAX_EID_LEN); 259 seid_str[SMC_MAX_EID_LEN] = 0; 260 if (nla_put_string(skb, SMC_NLA_SEID_ENTRY, seid_str)) 261 goto err; 262 read_lock(&smc_clc_eid_table.lock); 263 seid_enabled = smc_clc_eid_table.seid_enabled; 264 read_unlock(&smc_clc_eid_table.lock); 265 if (nla_put_u8(skb, SMC_NLA_SEID_ENABLED, seid_enabled)) 266 goto err; 267 end: 268 genlmsg_end(skb, hdr); 269 cb_ctx->pos[0]++; 270 return skb->len; 271 err: 272 genlmsg_cancel(skb, hdr); 273 return -EMSGSIZE; 274 } 275 276 int smc_nl_enable_seid(struct sk_buff *skb, struct genl_info *info) 277 { 278 #if IS_ENABLED(CONFIG_S390) 279 write_lock(&smc_clc_eid_table.lock); 280 smc_clc_eid_table.seid_enabled = 1; 281 write_unlock(&smc_clc_eid_table.lock); 282 return 0; 283 #else 284 return -EOPNOTSUPP; 285 #endif 286 } 287 288 int smc_nl_disable_seid(struct sk_buff *skb, struct genl_info *info) 289 { 290 int rc = 0; 291 292 #if IS_ENABLED(CONFIG_S390) 293 write_lock(&smc_clc_eid_table.lock); 294 if (!smc_clc_eid_table.ueid_cnt) 295 rc = -ENOENT; 296 else 297 smc_clc_eid_table.seid_enabled = 0; 298 write_unlock(&smc_clc_eid_table.lock); 299 #else 300 rc = -EOPNOTSUPP; 301 #endif 302 return rc; 303 } 304 305 static bool _smc_clc_match_ueid(u8 *peer_ueid) 306 { 307 struct smc_clc_eid_entry *tmp_ueid; 308 309 list_for_each_entry(tmp_ueid, &smc_clc_eid_table.list, list) { 310 if (!memcmp(tmp_ueid->eid, peer_ueid, SMC_MAX_EID_LEN)) 311 return true; 312 } 313 return false; 314 } 315 316 bool smc_clc_match_eid(u8 *negotiated_eid, 317 struct smc_clc_v2_extension *smc_v2_ext, 318 u8 *peer_eid, u8 *local_eid) 319 { 320 bool match = false; 321 int i; 322 323 negotiated_eid[0] = 0; 324 read_lock(&smc_clc_eid_table.lock); 325 if (peer_eid && local_eid && 326 smc_clc_eid_table.seid_enabled && 327 smc_v2_ext->hdr.flag.seid && 328 !memcmp(peer_eid, local_eid, SMC_MAX_EID_LEN)) { 329 memcpy(negotiated_eid, peer_eid, SMC_MAX_EID_LEN); 330 match = true; 331 goto out; 332 } 333 334 for (i = 0; i < smc_v2_ext->hdr.eid_cnt; i++) { 335 if (_smc_clc_match_ueid(smc_v2_ext->user_eids[i])) { 336 memcpy(negotiated_eid, smc_v2_ext->user_eids[i], 337 SMC_MAX_EID_LEN); 338 match = true; 339 goto out; 340 } 341 } 342 out: 343 read_unlock(&smc_clc_eid_table.lock); 344 return match; 345 } 346 347 /* check arriving CLC proposal */ 348 static bool smc_clc_msg_prop_valid(struct smc_clc_msg_proposal *pclc) 349 { 350 struct smc_clc_msg_proposal_prefix *pclc_prfx; 351 struct smc_clc_smcd_v2_extension *smcd_v2_ext; 352 struct smc_clc_msg_hdr *hdr = &pclc->hdr; 353 struct smc_clc_v2_extension *v2_ext; 354 355 v2_ext = smc_get_clc_v2_ext(pclc); 356 pclc_prfx = smc_clc_proposal_get_prefix(pclc); 357 if (hdr->version == SMC_V1) { 358 if (hdr->typev1 == SMC_TYPE_N) 359 return false; 360 if (ntohs(hdr->length) != 361 sizeof(*pclc) + ntohs(pclc->iparea_offset) + 362 sizeof(*pclc_prfx) + 363 pclc_prfx->ipv6_prefixes_cnt * 364 sizeof(struct smc_clc_ipv6_prefix) + 365 sizeof(struct smc_clc_msg_trail)) 366 return false; 367 } else { 368 if (ntohs(hdr->length) != 369 sizeof(*pclc) + 370 sizeof(struct smc_clc_msg_smcd) + 371 (hdr->typev1 != SMC_TYPE_N ? 372 sizeof(*pclc_prfx) + 373 pclc_prfx->ipv6_prefixes_cnt * 374 sizeof(struct smc_clc_ipv6_prefix) : 0) + 375 (hdr->typev2 != SMC_TYPE_N ? 376 sizeof(*v2_ext) + 377 v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN : 0) + 378 (smcd_indicated(hdr->typev2) ? 379 sizeof(*smcd_v2_ext) + v2_ext->hdr.ism_gid_cnt * 380 sizeof(struct smc_clc_smcd_gid_chid) : 381 0) + 382 sizeof(struct smc_clc_msg_trail)) 383 return false; 384 } 385 return true; 386 } 387 388 /* check arriving CLC accept or confirm */ 389 static bool 390 smc_clc_msg_acc_conf_valid(struct smc_clc_msg_accept_confirm *clc) 391 { 392 struct smc_clc_msg_hdr *hdr = &clc->hdr; 393 394 if (hdr->typev1 != SMC_TYPE_R && hdr->typev1 != SMC_TYPE_D) 395 return false; 396 if (hdr->version == SMC_V1) { 397 if ((hdr->typev1 == SMC_TYPE_R && 398 ntohs(hdr->length) != SMCR_CLC_ACCEPT_CONFIRM_LEN) || 399 (hdr->typev1 == SMC_TYPE_D && 400 ntohs(hdr->length) != SMCD_CLC_ACCEPT_CONFIRM_LEN)) 401 return false; 402 } else { 403 if (hdr->typev1 == SMC_TYPE_D && 404 ntohs(hdr->length) < SMCD_CLC_ACCEPT_CONFIRM_LEN_V2) 405 return false; 406 if (hdr->typev1 == SMC_TYPE_R && 407 ntohs(hdr->length) < SMCR_CLC_ACCEPT_CONFIRM_LEN_V2) 408 return false; 409 } 410 return true; 411 } 412 413 /* check arriving CLC decline */ 414 static bool 415 smc_clc_msg_decl_valid(struct smc_clc_msg_decline *dclc) 416 { 417 struct smc_clc_msg_hdr *hdr = &dclc->hdr; 418 419 if (hdr->typev1 != SMC_TYPE_R && hdr->typev1 != SMC_TYPE_D) 420 return false; 421 if (hdr->version == SMC_V1) { 422 if (ntohs(hdr->length) != sizeof(struct smc_clc_msg_decline)) 423 return false; 424 } else { 425 if (ntohs(hdr->length) != sizeof(struct smc_clc_msg_decline_v2)) 426 return false; 427 } 428 return true; 429 } 430 431 static int smc_clc_fill_fce_v2x(struct smc_clc_first_contact_ext_v2x *fce_v2x, 432 struct smc_init_info *ini) 433 { 434 int ret = sizeof(*fce_v2x); 435 436 memset(fce_v2x, 0, sizeof(*fce_v2x)); 437 fce_v2x->fce_v2_base.os_type = SMC_CLC_OS_LINUX; 438 fce_v2x->fce_v2_base.release = ini->release_nr; 439 memcpy(fce_v2x->fce_v2_base.hostname, 440 smc_hostname, sizeof(smc_hostname)); 441 if (ini->is_smcd && ini->release_nr < SMC_RELEASE_1) { 442 ret = sizeof(struct smc_clc_first_contact_ext); 443 goto out; 444 } 445 446 if (ini->release_nr >= SMC_RELEASE_1) { 447 if (!ini->is_smcd) { 448 fce_v2x->max_conns = ini->max_conns; 449 fce_v2x->max_links = ini->max_links; 450 } 451 } 452 453 out: 454 return ret; 455 } 456 457 /* check if received message has a correct header length and contains valid 458 * heading and trailing eyecatchers 459 */ 460 static bool smc_clc_msg_hdr_valid(struct smc_clc_msg_hdr *clcm, bool check_trl) 461 { 462 struct smc_clc_msg_accept_confirm *clc; 463 struct smc_clc_msg_proposal *pclc; 464 struct smc_clc_msg_decline *dclc; 465 struct smc_clc_msg_trail *trl; 466 467 if (memcmp(clcm->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) && 468 memcmp(clcm->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER))) 469 return false; 470 switch (clcm->type) { 471 case SMC_CLC_PROPOSAL: 472 pclc = (struct smc_clc_msg_proposal *)clcm; 473 if (!smc_clc_msg_prop_valid(pclc)) 474 return false; 475 trl = (struct smc_clc_msg_trail *) 476 ((u8 *)pclc + ntohs(pclc->hdr.length) - sizeof(*trl)); 477 break; 478 case SMC_CLC_ACCEPT: 479 case SMC_CLC_CONFIRM: 480 clc = (struct smc_clc_msg_accept_confirm *)clcm; 481 if (!smc_clc_msg_acc_conf_valid(clc)) 482 return false; 483 trl = (struct smc_clc_msg_trail *) 484 ((u8 *)clc + ntohs(clc->hdr.length) - sizeof(*trl)); 485 break; 486 case SMC_CLC_DECLINE: 487 dclc = (struct smc_clc_msg_decline *)clcm; 488 if (!smc_clc_msg_decl_valid(dclc)) 489 return false; 490 check_trl = false; 491 break; 492 default: 493 return false; 494 } 495 if (check_trl && 496 memcmp(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)) && 497 memcmp(trl->eyecatcher, SMCD_EYECATCHER, sizeof(SMCD_EYECATCHER))) 498 return false; 499 return true; 500 } 501 502 /* find ipv4 addr on device and get the prefix len, fill CLC proposal msg */ 503 static int smc_clc_prfx_set4_rcu(struct dst_entry *dst, __be32 ipv4, 504 struct smc_clc_msg_proposal_prefix *prop) 505 { 506 struct in_device *in_dev = __in_dev_get_rcu(dst->dev); 507 const struct in_ifaddr *ifa; 508 509 if (!in_dev) 510 return -ENODEV; 511 512 in_dev_for_each_ifa_rcu(ifa, in_dev) { 513 if (!inet_ifa_match(ipv4, ifa)) 514 continue; 515 prop->prefix_len = inet_mask_len(ifa->ifa_mask); 516 prop->outgoing_subnet = ifa->ifa_address & ifa->ifa_mask; 517 /* prop->ipv6_prefixes_cnt = 0; already done by memset before */ 518 return 0; 519 } 520 return -ENOENT; 521 } 522 523 /* fill CLC proposal msg with ipv6 prefixes from device */ 524 static int smc_clc_prfx_set6_rcu(struct dst_entry *dst, 525 struct smc_clc_msg_proposal_prefix *prop, 526 struct smc_clc_ipv6_prefix *ipv6_prfx) 527 { 528 #if IS_ENABLED(CONFIG_IPV6) 529 struct inet6_dev *in6_dev = __in6_dev_get(dst->dev); 530 struct inet6_ifaddr *ifa; 531 int cnt = 0; 532 533 if (!in6_dev) 534 return -ENODEV; 535 /* use a maximum of 8 IPv6 prefixes from device */ 536 list_for_each_entry(ifa, &in6_dev->addr_list, if_list) { 537 if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL) 538 continue; 539 ipv6_addr_prefix(&ipv6_prfx[cnt].prefix, 540 &ifa->addr, ifa->prefix_len); 541 ipv6_prfx[cnt].prefix_len = ifa->prefix_len; 542 cnt++; 543 if (cnt == SMC_CLC_MAX_V6_PREFIX) 544 break; 545 } 546 prop->ipv6_prefixes_cnt = cnt; 547 if (cnt) 548 return 0; 549 #endif 550 return -ENOENT; 551 } 552 553 /* retrieve and set prefixes in CLC proposal msg */ 554 static int smc_clc_prfx_set(struct socket *clcsock, 555 struct smc_clc_msg_proposal_prefix *prop, 556 struct smc_clc_ipv6_prefix *ipv6_prfx) 557 { 558 struct dst_entry *dst = sk_dst_get(clcsock->sk); 559 struct sockaddr_storage addrs; 560 struct sockaddr_in6 *addr6; 561 struct sockaddr_in *addr; 562 int rc = -ENOENT; 563 564 if (!dst) { 565 rc = -ENOTCONN; 566 goto out; 567 } 568 if (!dst->dev) { 569 rc = -ENODEV; 570 goto out_rel; 571 } 572 /* get address to which the internal TCP socket is bound */ 573 if (kernel_getsockname(clcsock, (struct sockaddr *)&addrs) < 0) 574 goto out_rel; 575 /* analyze IP specific data of net_device belonging to TCP socket */ 576 addr6 = (struct sockaddr_in6 *)&addrs; 577 rcu_read_lock(); 578 if (addrs.ss_family == PF_INET) { 579 /* IPv4 */ 580 addr = (struct sockaddr_in *)&addrs; 581 rc = smc_clc_prfx_set4_rcu(dst, addr->sin_addr.s_addr, prop); 582 } else if (ipv6_addr_v4mapped(&addr6->sin6_addr)) { 583 /* mapped IPv4 address - peer is IPv4 only */ 584 rc = smc_clc_prfx_set4_rcu(dst, addr6->sin6_addr.s6_addr32[3], 585 prop); 586 } else { 587 /* IPv6 */ 588 rc = smc_clc_prfx_set6_rcu(dst, prop, ipv6_prfx); 589 } 590 rcu_read_unlock(); 591 out_rel: 592 dst_release(dst); 593 out: 594 return rc; 595 } 596 597 /* match ipv4 addrs of dev against addr in CLC proposal */ 598 static int smc_clc_prfx_match4_rcu(struct net_device *dev, 599 struct smc_clc_msg_proposal_prefix *prop) 600 { 601 struct in_device *in_dev = __in_dev_get_rcu(dev); 602 const struct in_ifaddr *ifa; 603 604 if (!in_dev) 605 return -ENODEV; 606 in_dev_for_each_ifa_rcu(ifa, in_dev) { 607 if (prop->prefix_len == inet_mask_len(ifa->ifa_mask) && 608 inet_ifa_match(prop->outgoing_subnet, ifa)) 609 return 0; 610 } 611 612 return -ENOENT; 613 } 614 615 /* match ipv6 addrs of dev against addrs in CLC proposal */ 616 static int smc_clc_prfx_match6_rcu(struct net_device *dev, 617 struct smc_clc_msg_proposal_prefix *prop) 618 { 619 #if IS_ENABLED(CONFIG_IPV6) 620 struct inet6_dev *in6_dev = __in6_dev_get(dev); 621 struct smc_clc_ipv6_prefix *ipv6_prfx; 622 struct inet6_ifaddr *ifa; 623 int i, max; 624 625 if (!in6_dev) 626 return -ENODEV; 627 /* ipv6 prefix list starts behind smc_clc_msg_proposal_prefix */ 628 ipv6_prfx = (struct smc_clc_ipv6_prefix *)((u8 *)prop + sizeof(*prop)); 629 max = min_t(u8, prop->ipv6_prefixes_cnt, SMC_CLC_MAX_V6_PREFIX); 630 list_for_each_entry(ifa, &in6_dev->addr_list, if_list) { 631 if (ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL) 632 continue; 633 for (i = 0; i < max; i++) { 634 if (ifa->prefix_len == ipv6_prfx[i].prefix_len && 635 ipv6_prefix_equal(&ifa->addr, &ipv6_prfx[i].prefix, 636 ifa->prefix_len)) 637 return 0; 638 } 639 } 640 #endif 641 return -ENOENT; 642 } 643 644 /* check if proposed prefixes match one of our device prefixes */ 645 int smc_clc_prfx_match(struct socket *clcsock, 646 struct smc_clc_msg_proposal_prefix *prop) 647 { 648 struct dst_entry *dst = sk_dst_get(clcsock->sk); 649 int rc; 650 651 if (!dst) { 652 rc = -ENOTCONN; 653 goto out; 654 } 655 if (!dst->dev) { 656 rc = -ENODEV; 657 goto out_rel; 658 } 659 rcu_read_lock(); 660 if (!prop->ipv6_prefixes_cnt) 661 rc = smc_clc_prfx_match4_rcu(dst->dev, prop); 662 else 663 rc = smc_clc_prfx_match6_rcu(dst->dev, prop); 664 rcu_read_unlock(); 665 out_rel: 666 dst_release(dst); 667 out: 668 return rc; 669 } 670 671 /* Wait for data on the tcp-socket, analyze received data 672 * Returns: 673 * 0 if success and it was not a decline that we received. 674 * SMC_CLC_DECL_REPLY if decline received for fallback w/o another decl send. 675 * clcsock error, -EINTR, -ECONNRESET, -EPROTO otherwise. 676 */ 677 int smc_clc_wait_msg(struct smc_sock *smc, void *buf, int buflen, 678 u8 expected_type, unsigned long timeout) 679 { 680 long rcvtimeo = smc->clcsock->sk->sk_rcvtimeo; 681 struct sock *clc_sk = smc->clcsock->sk; 682 struct smc_clc_msg_hdr *clcm = buf; 683 struct msghdr msg = {NULL, 0}; 684 int reason_code = 0; 685 struct kvec vec = {buf, buflen}; 686 int len, datlen, recvlen; 687 bool check_trl = true; 688 int krflags; 689 690 /* peek the first few bytes to determine length of data to receive 691 * so we don't consume any subsequent CLC message or payload data 692 * in the TCP byte stream 693 */ 694 /* 695 * Caller must make sure that buflen is no less than 696 * sizeof(struct smc_clc_msg_hdr) 697 */ 698 krflags = MSG_PEEK | MSG_WAITALL; 699 clc_sk->sk_rcvtimeo = timeout; 700 iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1, 701 sizeof(struct smc_clc_msg_hdr)); 702 len = sock_recvmsg(smc->clcsock, &msg, krflags); 703 if (signal_pending(current)) { 704 reason_code = -EINTR; 705 clc_sk->sk_err = EINTR; 706 smc->sk.sk_err = EINTR; 707 goto out; 708 } 709 if (clc_sk->sk_err) { 710 reason_code = -clc_sk->sk_err; 711 if (clc_sk->sk_err == EAGAIN && 712 expected_type == SMC_CLC_DECLINE) 713 clc_sk->sk_err = 0; /* reset for fallback usage */ 714 else 715 smc->sk.sk_err = clc_sk->sk_err; 716 goto out; 717 } 718 if (!len) { /* peer has performed orderly shutdown */ 719 smc->sk.sk_err = ECONNRESET; 720 reason_code = -ECONNRESET; 721 goto out; 722 } 723 if (len < 0) { 724 if (len != -EAGAIN || expected_type != SMC_CLC_DECLINE) 725 smc->sk.sk_err = -len; 726 reason_code = len; 727 goto out; 728 } 729 datlen = ntohs(clcm->length); 730 if ((len < sizeof(struct smc_clc_msg_hdr)) || 731 (clcm->version < SMC_V1) || 732 ((clcm->type != SMC_CLC_DECLINE) && 733 (clcm->type != expected_type))) { 734 smc->sk.sk_err = EPROTO; 735 reason_code = -EPROTO; 736 goto out; 737 } 738 739 /* receive the complete CLC message */ 740 memset(&msg, 0, sizeof(struct msghdr)); 741 if (datlen > buflen) { 742 check_trl = false; 743 recvlen = buflen; 744 } else { 745 recvlen = datlen; 746 } 747 iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1, recvlen); 748 krflags = MSG_WAITALL; 749 len = sock_recvmsg(smc->clcsock, &msg, krflags); 750 if (len < recvlen || !smc_clc_msg_hdr_valid(clcm, check_trl)) { 751 smc->sk.sk_err = EPROTO; 752 reason_code = -EPROTO; 753 goto out; 754 } 755 datlen -= len; 756 while (datlen) { 757 u8 tmp[SMC_CLC_RECV_BUF_LEN]; 758 759 vec.iov_base = &tmp; 760 vec.iov_len = SMC_CLC_RECV_BUF_LEN; 761 /* receive remaining proposal message */ 762 recvlen = datlen > SMC_CLC_RECV_BUF_LEN ? 763 SMC_CLC_RECV_BUF_LEN : datlen; 764 iov_iter_kvec(&msg.msg_iter, ITER_DEST, &vec, 1, recvlen); 765 len = sock_recvmsg(smc->clcsock, &msg, krflags); 766 datlen -= len; 767 } 768 if (clcm->type == SMC_CLC_DECLINE) { 769 struct smc_clc_msg_decline *dclc; 770 771 dclc = (struct smc_clc_msg_decline *)clcm; 772 reason_code = SMC_CLC_DECL_PEERDECL; 773 smc->peer_diagnosis = ntohl(dclc->peer_diagnosis); 774 if (((struct smc_clc_msg_decline *)buf)->hdr.typev2 & 775 SMC_FIRST_CONTACT_MASK) { 776 smc->conn.lgr->sync_err = 1; 777 smc_lgr_terminate_sched(smc->conn.lgr); 778 } 779 } 780 781 out: 782 clc_sk->sk_rcvtimeo = rcvtimeo; 783 return reason_code; 784 } 785 786 /* send CLC DECLINE message across internal TCP socket */ 787 int smc_clc_send_decline(struct smc_sock *smc, u32 peer_diag_info, u8 version) 788 { 789 struct smc_clc_msg_decline *dclc_v1; 790 struct smc_clc_msg_decline_v2 dclc; 791 struct msghdr msg; 792 int len, send_len; 793 struct kvec vec; 794 795 dclc_v1 = (struct smc_clc_msg_decline *)&dclc; 796 memset(&dclc, 0, sizeof(dclc)); 797 memcpy(dclc.hdr.eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)); 798 dclc.hdr.type = SMC_CLC_DECLINE; 799 dclc.hdr.version = version; 800 dclc.os_type = version == SMC_V1 ? 0 : SMC_CLC_OS_LINUX; 801 dclc.hdr.typev2 = (peer_diag_info == SMC_CLC_DECL_SYNCERR) ? 802 SMC_FIRST_CONTACT_MASK : 0; 803 if ((!smc_conn_lgr_valid(&smc->conn) || !smc->conn.lgr->is_smcd) && 804 smc_ib_is_valid_local_systemid()) 805 memcpy(dclc.id_for_peer, local_systemid, 806 sizeof(local_systemid)); 807 dclc.peer_diagnosis = htonl(peer_diag_info); 808 if (version == SMC_V1) { 809 memcpy(dclc_v1->trl.eyecatcher, SMC_EYECATCHER, 810 sizeof(SMC_EYECATCHER)); 811 send_len = sizeof(*dclc_v1); 812 } else { 813 memcpy(dclc.trl.eyecatcher, SMC_EYECATCHER, 814 sizeof(SMC_EYECATCHER)); 815 send_len = sizeof(dclc); 816 } 817 dclc.hdr.length = htons(send_len); 818 819 memset(&msg, 0, sizeof(msg)); 820 vec.iov_base = &dclc; 821 vec.iov_len = send_len; 822 len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1, send_len); 823 if (len < 0 || len < send_len) 824 len = -EPROTO; 825 return len > 0 ? 0 : len; 826 } 827 828 /* send CLC PROPOSAL message across internal TCP socket */ 829 int smc_clc_send_proposal(struct smc_sock *smc, struct smc_init_info *ini) 830 { 831 struct smc_clc_smcd_v2_extension *smcd_v2_ext; 832 struct smc_clc_msg_proposal_prefix *pclc_prfx; 833 struct smc_clc_msg_proposal *pclc_base; 834 struct smc_clc_smcd_gid_chid *gidchids; 835 struct smc_clc_msg_proposal_area *pclc; 836 struct smc_clc_ipv6_prefix *ipv6_prfx; 837 struct smc_clc_v2_extension *v2_ext; 838 struct smc_clc_msg_smcd *pclc_smcd; 839 struct smc_clc_msg_trail *trl; 840 struct smcd_dev *smcd; 841 int len, i, plen, rc; 842 int reason_code = 0; 843 struct kvec vec[8]; 844 struct msghdr msg; 845 846 pclc = kzalloc(sizeof(*pclc), GFP_KERNEL); 847 if (!pclc) 848 return -ENOMEM; 849 850 pclc_base = &pclc->pclc_base; 851 pclc_smcd = &pclc->pclc_smcd; 852 pclc_prfx = &pclc->pclc_prfx; 853 ipv6_prfx = pclc->pclc_prfx_ipv6; 854 v2_ext = &pclc->pclc_v2_ext; 855 smcd_v2_ext = &pclc->pclc_smcd_v2_ext; 856 gidchids = pclc->pclc_gidchids; 857 trl = &pclc->pclc_trl; 858 859 pclc_base->hdr.version = SMC_V2; 860 pclc_base->hdr.typev1 = ini->smc_type_v1; 861 pclc_base->hdr.typev2 = ini->smc_type_v2; 862 plen = sizeof(*pclc_base) + sizeof(*pclc_smcd) + sizeof(*trl); 863 864 /* retrieve ip prefixes for CLC proposal msg */ 865 if (ini->smc_type_v1 != SMC_TYPE_N) { 866 rc = smc_clc_prfx_set(smc->clcsock, pclc_prfx, ipv6_prfx); 867 if (rc) { 868 if (ini->smc_type_v2 == SMC_TYPE_N) { 869 kfree(pclc); 870 return SMC_CLC_DECL_CNFERR; 871 } 872 pclc_base->hdr.typev1 = SMC_TYPE_N; 873 } else { 874 pclc_base->iparea_offset = htons(sizeof(*pclc_smcd)); 875 plen += sizeof(*pclc_prfx) + 876 pclc_prfx->ipv6_prefixes_cnt * 877 sizeof(ipv6_prfx[0]); 878 } 879 } 880 881 /* build SMC Proposal CLC message */ 882 memcpy(pclc_base->hdr.eyecatcher, SMC_EYECATCHER, 883 sizeof(SMC_EYECATCHER)); 884 pclc_base->hdr.type = SMC_CLC_PROPOSAL; 885 if (smcr_indicated(ini->smc_type_v1)) { 886 /* add SMC-R specifics */ 887 memcpy(pclc_base->lcl.id_for_peer, local_systemid, 888 sizeof(local_systemid)); 889 memcpy(pclc_base->lcl.gid, ini->ib_gid, SMC_GID_SIZE); 890 memcpy(pclc_base->lcl.mac, &ini->ib_dev->mac[ini->ib_port - 1], 891 ETH_ALEN); 892 } 893 if (smcd_indicated(ini->smc_type_v1)) { 894 struct smcd_gid smcd_gid; 895 896 /* add SMC-D specifics */ 897 if (ini->ism_dev[0]) { 898 smcd = ini->ism_dev[0]; 899 smcd->ops->get_local_gid(smcd, &smcd_gid); 900 pclc_smcd->ism.gid = htonll(smcd_gid.gid); 901 pclc_smcd->ism.chid = 902 htons(smc_ism_get_chid(ini->ism_dev[0])); 903 } 904 } 905 if (ini->smc_type_v2 == SMC_TYPE_N) { 906 pclc_smcd->v2_ext_offset = 0; 907 } else { 908 struct smc_clc_eid_entry *ueident; 909 u16 v2_ext_offset; 910 911 v2_ext->hdr.flag.release = SMC_RELEASE; 912 v2_ext_offset = sizeof(*pclc_smcd) - 913 offsetofend(struct smc_clc_msg_smcd, v2_ext_offset); 914 if (ini->smc_type_v1 != SMC_TYPE_N) 915 v2_ext_offset += sizeof(*pclc_prfx) + 916 pclc_prfx->ipv6_prefixes_cnt * 917 sizeof(ipv6_prfx[0]); 918 pclc_smcd->v2_ext_offset = htons(v2_ext_offset); 919 plen += sizeof(*v2_ext); 920 921 read_lock(&smc_clc_eid_table.lock); 922 v2_ext->hdr.eid_cnt = smc_clc_eid_table.ueid_cnt; 923 plen += smc_clc_eid_table.ueid_cnt * SMC_MAX_EID_LEN; 924 i = 0; 925 list_for_each_entry(ueident, &smc_clc_eid_table.list, list) { 926 memcpy(v2_ext->user_eids[i++], ueident->eid, 927 sizeof(ueident->eid)); 928 } 929 read_unlock(&smc_clc_eid_table.lock); 930 } 931 if (smcd_indicated(ini->smc_type_v2)) { 932 struct smcd_gid smcd_gid; 933 u8 *eid = NULL; 934 int entry = 0; 935 936 v2_ext->hdr.flag.seid = smc_clc_eid_table.seid_enabled; 937 v2_ext->hdr.smcd_v2_ext_offset = htons(sizeof(*v2_ext) - 938 offsetofend(struct smc_clnt_opts_area_hdr, 939 smcd_v2_ext_offset) + 940 v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN); 941 smc_ism_get_system_eid(&eid); 942 if (eid && v2_ext->hdr.flag.seid) 943 memcpy(smcd_v2_ext->system_eid, eid, SMC_MAX_EID_LEN); 944 plen += sizeof(*smcd_v2_ext); 945 if (ini->ism_offered_cnt) { 946 for (i = 1; i <= ini->ism_offered_cnt; i++) { 947 smcd = ini->ism_dev[i]; 948 smcd->ops->get_local_gid(smcd, &smcd_gid); 949 gidchids[entry].chid = 950 htons(smc_ism_get_chid(ini->ism_dev[i])); 951 gidchids[entry].gid = htonll(smcd_gid.gid); 952 if (smc_ism_is_virtual(smcd)) { 953 /* a virtual ISM device takes two 954 * entries. CHID of the second entry 955 * repeats that of the first entry. 956 */ 957 gidchids[entry + 1].chid = 958 gidchids[entry].chid; 959 gidchids[entry + 1].gid = 960 htonll(smcd_gid.gid_ext); 961 entry++; 962 } 963 entry++; 964 } 965 plen += entry * sizeof(struct smc_clc_smcd_gid_chid); 966 } 967 v2_ext->hdr.ism_gid_cnt = entry; 968 } 969 if (smcr_indicated(ini->smc_type_v2)) { 970 memcpy(v2_ext->roce, ini->smcrv2.ib_gid_v2, SMC_GID_SIZE); 971 v2_ext->max_conns = SMC_CONN_PER_LGR_PREFER; 972 v2_ext->max_links = SMC_LINKS_PER_LGR_MAX_PREFER; 973 } 974 975 pclc_base->hdr.length = htons(plen); 976 memcpy(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)); 977 978 /* send SMC Proposal CLC message */ 979 memset(&msg, 0, sizeof(msg)); 980 i = 0; 981 vec[i].iov_base = pclc_base; 982 vec[i++].iov_len = sizeof(*pclc_base); 983 vec[i].iov_base = pclc_smcd; 984 vec[i++].iov_len = sizeof(*pclc_smcd); 985 if (ini->smc_type_v1 != SMC_TYPE_N) { 986 vec[i].iov_base = pclc_prfx; 987 vec[i++].iov_len = sizeof(*pclc_prfx); 988 if (pclc_prfx->ipv6_prefixes_cnt > 0) { 989 vec[i].iov_base = ipv6_prfx; 990 vec[i++].iov_len = pclc_prfx->ipv6_prefixes_cnt * 991 sizeof(ipv6_prfx[0]); 992 } 993 } 994 if (ini->smc_type_v2 != SMC_TYPE_N) { 995 vec[i].iov_base = v2_ext; 996 vec[i++].iov_len = sizeof(*v2_ext) + 997 (v2_ext->hdr.eid_cnt * SMC_MAX_EID_LEN); 998 if (smcd_indicated(ini->smc_type_v2)) { 999 vec[i].iov_base = smcd_v2_ext; 1000 vec[i++].iov_len = sizeof(*smcd_v2_ext); 1001 if (ini->ism_offered_cnt) { 1002 vec[i].iov_base = gidchids; 1003 vec[i++].iov_len = v2_ext->hdr.ism_gid_cnt * 1004 sizeof(struct smc_clc_smcd_gid_chid); 1005 } 1006 } 1007 } 1008 vec[i].iov_base = trl; 1009 vec[i++].iov_len = sizeof(*trl); 1010 /* due to the few bytes needed for clc-handshake this cannot block */ 1011 len = kernel_sendmsg(smc->clcsock, &msg, vec, i, plen); 1012 if (len < 0) { 1013 smc->sk.sk_err = smc->clcsock->sk->sk_err; 1014 reason_code = -smc->sk.sk_err; 1015 } else if (len < ntohs(pclc_base->hdr.length)) { 1016 reason_code = -ENETUNREACH; 1017 smc->sk.sk_err = -reason_code; 1018 } 1019 1020 kfree(pclc); 1021 return reason_code; 1022 } 1023 1024 static void 1025 smcd_clc_prep_confirm_accept(struct smc_connection *conn, 1026 struct smc_clc_msg_accept_confirm *clc, 1027 int first_contact, u8 version, 1028 u8 *eid, struct smc_init_info *ini, 1029 int *fce_len, 1030 struct smc_clc_first_contact_ext_v2x *fce_v2x, 1031 struct smc_clc_msg_trail *trl) 1032 { 1033 struct smcd_dev *smcd = conn->lgr->smcd; 1034 struct smcd_gid smcd_gid; 1035 u16 chid; 1036 int len; 1037 1038 /* SMC-D specific settings */ 1039 memcpy(clc->hdr.eyecatcher, SMCD_EYECATCHER, 1040 sizeof(SMCD_EYECATCHER)); 1041 smcd->ops->get_local_gid(smcd, &smcd_gid); 1042 clc->hdr.typev1 = SMC_TYPE_D; 1043 clc->d0.gid = htonll(smcd_gid.gid); 1044 clc->d0.token = htonll(conn->rmb_desc->token); 1045 clc->d0.dmbe_size = conn->rmbe_size_comp; 1046 clc->d0.dmbe_idx = 0; 1047 memcpy(&clc->d0.linkid, conn->lgr->id, SMC_LGR_ID_SIZE); 1048 if (version == SMC_V1) { 1049 clc->hdr.length = htons(SMCD_CLC_ACCEPT_CONFIRM_LEN); 1050 } else { 1051 chid = smc_ism_get_chid(smcd); 1052 clc->d1.chid = htons(chid); 1053 if (eid && eid[0]) 1054 memcpy(clc->d1.eid, eid, SMC_MAX_EID_LEN); 1055 if (__smc_ism_is_virtual(chid)) 1056 clc->d1.gid_ext = htonll(smcd_gid.gid_ext); 1057 len = SMCD_CLC_ACCEPT_CONFIRM_LEN_V2; 1058 if (first_contact) { 1059 *fce_len = smc_clc_fill_fce_v2x(fce_v2x, ini); 1060 len += *fce_len; 1061 } 1062 clc->hdr.length = htons(len); 1063 } 1064 memcpy(trl->eyecatcher, SMCD_EYECATCHER, 1065 sizeof(SMCD_EYECATCHER)); 1066 } 1067 1068 static void 1069 smcr_clc_prep_confirm_accept(struct smc_connection *conn, 1070 struct smc_clc_msg_accept_confirm *clc, 1071 int first_contact, u8 version, 1072 u8 *eid, struct smc_init_info *ini, 1073 int *fce_len, 1074 struct smc_clc_first_contact_ext_v2x *fce_v2x, 1075 struct smc_clc_fce_gid_ext *gle, 1076 struct smc_clc_msg_trail *trl) 1077 { 1078 struct smc_link *link = conn->lnk; 1079 int len; 1080 1081 /* SMC-R specific settings */ 1082 memcpy(clc->hdr.eyecatcher, SMC_EYECATCHER, 1083 sizeof(SMC_EYECATCHER)); 1084 clc->hdr.typev1 = SMC_TYPE_R; 1085 memcpy(clc->r0.lcl.id_for_peer, local_systemid, 1086 sizeof(local_systemid)); 1087 memcpy(&clc->r0.lcl.gid, link->gid, SMC_GID_SIZE); 1088 memcpy(&clc->r0.lcl.mac, &link->smcibdev->mac[link->ibport - 1], 1089 ETH_ALEN); 1090 hton24(clc->r0.qpn, link->roce_qp->qp_num); 1091 clc->r0.rmb_rkey = 1092 htonl(conn->rmb_desc->mr[link->link_idx]->rkey); 1093 clc->r0.rmbe_idx = 1; /* for now: 1 RMB = 1 RMBE */ 1094 clc->r0.rmbe_alert_token = htonl(conn->alert_token_local); 1095 switch (clc->hdr.type) { 1096 case SMC_CLC_ACCEPT: 1097 clc->r0.qp_mtu = link->path_mtu; 1098 break; 1099 case SMC_CLC_CONFIRM: 1100 clc->r0.qp_mtu = min(link->path_mtu, link->peer_mtu); 1101 break; 1102 } 1103 clc->r0.rmbe_size = conn->rmbe_size_comp; 1104 clc->r0.rmb_dma_addr = conn->rmb_desc->is_vm ? 1105 cpu_to_be64((uintptr_t)conn->rmb_desc->cpu_addr) : 1106 cpu_to_be64((u64)sg_dma_address 1107 (conn->rmb_desc->sgt[link->link_idx].sgl)); 1108 hton24(clc->r0.psn, link->psn_initial); 1109 if (version == SMC_V1) { 1110 clc->hdr.length = htons(SMCR_CLC_ACCEPT_CONFIRM_LEN); 1111 } else { 1112 if (eid && eid[0]) 1113 memcpy(clc->r1.eid, eid, SMC_MAX_EID_LEN); 1114 len = SMCR_CLC_ACCEPT_CONFIRM_LEN_V2; 1115 if (first_contact) { 1116 *fce_len = smc_clc_fill_fce_v2x(fce_v2x, ini); 1117 len += *fce_len; 1118 fce_v2x->fce_v2_base.v2_direct = 1119 !link->lgr->uses_gateway; 1120 if (clc->hdr.type == SMC_CLC_CONFIRM) { 1121 memset(gle, 0, sizeof(*gle)); 1122 gle->gid_cnt = ini->smcrv2.gidlist.len; 1123 len += sizeof(*gle); 1124 len += gle->gid_cnt * sizeof(gle->gid[0]); 1125 } 1126 } 1127 clc->hdr.length = htons(len); 1128 } 1129 memcpy(trl->eyecatcher, SMC_EYECATCHER, sizeof(SMC_EYECATCHER)); 1130 } 1131 1132 /* build and send CLC CONFIRM / ACCEPT message */ 1133 static int smc_clc_send_confirm_accept(struct smc_sock *smc, 1134 struct smc_clc_msg_accept_confirm *clc, 1135 int first_contact, u8 version, 1136 u8 *eid, struct smc_init_info *ini) 1137 { 1138 struct smc_clc_first_contact_ext_v2x fce_v2x; 1139 struct smc_connection *conn = &smc->conn; 1140 struct smc_clc_fce_gid_ext gle; 1141 struct smc_clc_msg_trail trl; 1142 int i, fce_len; 1143 struct kvec vec[5]; 1144 struct msghdr msg; 1145 1146 /* send SMC Confirm CLC msg */ 1147 clc->hdr.version = version; /* SMC version */ 1148 if (first_contact) 1149 clc->hdr.typev2 |= SMC_FIRST_CONTACT_MASK; 1150 if (conn->lgr->is_smcd) 1151 smcd_clc_prep_confirm_accept(conn, clc, first_contact, 1152 version, eid, ini, &fce_len, 1153 &fce_v2x, &trl); 1154 else 1155 smcr_clc_prep_confirm_accept(conn, clc, first_contact, 1156 version, eid, ini, &fce_len, 1157 &fce_v2x, &gle, &trl); 1158 memset(&msg, 0, sizeof(msg)); 1159 i = 0; 1160 vec[i].iov_base = clc; 1161 if (version > SMC_V1) 1162 vec[i++].iov_len = (clc->hdr.typev1 == SMC_TYPE_D ? 1163 SMCD_CLC_ACCEPT_CONFIRM_LEN_V2 : 1164 SMCR_CLC_ACCEPT_CONFIRM_LEN_V2) - 1165 sizeof(trl); 1166 else 1167 vec[i++].iov_len = (clc->hdr.typev1 == SMC_TYPE_D ? 1168 SMCD_CLC_ACCEPT_CONFIRM_LEN : 1169 SMCR_CLC_ACCEPT_CONFIRM_LEN) - 1170 sizeof(trl); 1171 if (version > SMC_V1 && first_contact) { 1172 vec[i].iov_base = &fce_v2x; 1173 vec[i++].iov_len = fce_len; 1174 if (!conn->lgr->is_smcd) { 1175 if (clc->hdr.type == SMC_CLC_CONFIRM) { 1176 vec[i].iov_base = &gle; 1177 vec[i++].iov_len = sizeof(gle); 1178 vec[i].iov_base = &ini->smcrv2.gidlist.list; 1179 vec[i++].iov_len = gle.gid_cnt * 1180 sizeof(gle.gid[0]); 1181 } 1182 } 1183 } 1184 vec[i].iov_base = &trl; 1185 vec[i++].iov_len = sizeof(trl); 1186 return kernel_sendmsg(smc->clcsock, &msg, vec, 1, 1187 ntohs(clc->hdr.length)); 1188 } 1189 1190 /* send CLC CONFIRM message across internal TCP socket */ 1191 int smc_clc_send_confirm(struct smc_sock *smc, bool clnt_first_contact, 1192 u8 version, u8 *eid, struct smc_init_info *ini) 1193 { 1194 struct smc_clc_msg_accept_confirm cclc; 1195 int reason_code = 0; 1196 int len; 1197 1198 /* send SMC Confirm CLC msg */ 1199 memset(&cclc, 0, sizeof(cclc)); 1200 cclc.hdr.type = SMC_CLC_CONFIRM; 1201 len = smc_clc_send_confirm_accept(smc, &cclc, clnt_first_contact, 1202 version, eid, ini); 1203 if (len < ntohs(cclc.hdr.length)) { 1204 if (len >= 0) { 1205 reason_code = -ENETUNREACH; 1206 smc->sk.sk_err = -reason_code; 1207 } else { 1208 smc->sk.sk_err = smc->clcsock->sk->sk_err; 1209 reason_code = -smc->sk.sk_err; 1210 } 1211 } 1212 return reason_code; 1213 } 1214 1215 /* send CLC ACCEPT message across internal TCP socket */ 1216 int smc_clc_send_accept(struct smc_sock *new_smc, bool srv_first_contact, 1217 u8 version, u8 *negotiated_eid, struct smc_init_info *ini) 1218 { 1219 struct smc_clc_msg_accept_confirm aclc; 1220 int len; 1221 1222 memset(&aclc, 0, sizeof(aclc)); 1223 aclc.hdr.type = SMC_CLC_ACCEPT; 1224 len = smc_clc_send_confirm_accept(new_smc, &aclc, srv_first_contact, 1225 version, negotiated_eid, ini); 1226 if (len < ntohs(aclc.hdr.length)) 1227 len = len >= 0 ? -EPROTO : -new_smc->clcsock->sk->sk_err; 1228 1229 return len > 0 ? 0 : len; 1230 } 1231 1232 int smc_clc_srv_v2x_features_validate(struct smc_clc_msg_proposal *pclc, 1233 struct smc_init_info *ini) 1234 { 1235 struct smc_clc_v2_extension *pclc_v2_ext; 1236 1237 ini->max_conns = SMC_CONN_PER_LGR_MAX; 1238 ini->max_links = SMC_LINKS_ADD_LNK_MAX; 1239 1240 if ((!(ini->smcd_version & SMC_V2) && !(ini->smcr_version & SMC_V2)) || 1241 ini->release_nr < SMC_RELEASE_1) 1242 return 0; 1243 1244 pclc_v2_ext = smc_get_clc_v2_ext(pclc); 1245 if (!pclc_v2_ext) 1246 return SMC_CLC_DECL_NOV2EXT; 1247 1248 if (ini->smcr_version & SMC_V2) { 1249 ini->max_conns = min_t(u8, pclc_v2_ext->max_conns, SMC_CONN_PER_LGR_PREFER); 1250 if (ini->max_conns < SMC_CONN_PER_LGR_MIN) 1251 return SMC_CLC_DECL_MAXCONNERR; 1252 1253 ini->max_links = min_t(u8, pclc_v2_ext->max_links, SMC_LINKS_PER_LGR_MAX_PREFER); 1254 if (ini->max_links < SMC_LINKS_ADD_LNK_MIN) 1255 return SMC_CLC_DECL_MAXLINKERR; 1256 } 1257 1258 return 0; 1259 } 1260 1261 int smc_clc_clnt_v2x_features_validate(struct smc_clc_first_contact_ext *fce, 1262 struct smc_init_info *ini) 1263 { 1264 struct smc_clc_first_contact_ext_v2x *fce_v2x = 1265 (struct smc_clc_first_contact_ext_v2x *)fce; 1266 1267 if (ini->release_nr < SMC_RELEASE_1) 1268 return 0; 1269 1270 if (!ini->is_smcd) { 1271 if (fce_v2x->max_conns < SMC_CONN_PER_LGR_MIN) 1272 return SMC_CLC_DECL_MAXCONNERR; 1273 ini->max_conns = fce_v2x->max_conns; 1274 1275 if (fce_v2x->max_links > SMC_LINKS_ADD_LNK_MAX || 1276 fce_v2x->max_links < SMC_LINKS_ADD_LNK_MIN) 1277 return SMC_CLC_DECL_MAXLINKERR; 1278 ini->max_links = fce_v2x->max_links; 1279 } 1280 1281 return 0; 1282 } 1283 1284 int smc_clc_v2x_features_confirm_check(struct smc_clc_msg_accept_confirm *cclc, 1285 struct smc_init_info *ini) 1286 { 1287 struct smc_clc_first_contact_ext *fce = 1288 smc_get_clc_first_contact_ext(cclc, ini->is_smcd); 1289 struct smc_clc_first_contact_ext_v2x *fce_v2x = 1290 (struct smc_clc_first_contact_ext_v2x *)fce; 1291 1292 if (cclc->hdr.version == SMC_V1 || 1293 !(cclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK)) 1294 return 0; 1295 1296 if (ini->release_nr != fce->release) 1297 return SMC_CLC_DECL_RELEASEERR; 1298 1299 if (fce->release < SMC_RELEASE_1) 1300 return 0; 1301 1302 if (!ini->is_smcd) { 1303 if (fce_v2x->max_conns != ini->max_conns) 1304 return SMC_CLC_DECL_MAXCONNERR; 1305 if (fce_v2x->max_links != ini->max_links) 1306 return SMC_CLC_DECL_MAXLINKERR; 1307 } 1308 1309 return 0; 1310 } 1311 1312 void smc_clc_get_hostname(u8 **host) 1313 { 1314 *host = &smc_hostname[0]; 1315 } 1316 1317 void __init smc_clc_init(void) 1318 { 1319 struct new_utsname *u; 1320 1321 memset(smc_hostname, _S, sizeof(smc_hostname)); /* ASCII blanks */ 1322 u = utsname(); 1323 memcpy(smc_hostname, u->nodename, 1324 min_t(size_t, strlen(u->nodename), sizeof(smc_hostname))); 1325 1326 INIT_LIST_HEAD(&smc_clc_eid_table.list); 1327 rwlock_init(&smc_clc_eid_table.lock); 1328 smc_clc_eid_table.ueid_cnt = 0; 1329 #if IS_ENABLED(CONFIG_S390) 1330 smc_clc_eid_table.seid_enabled = 1; 1331 #else 1332 smc_clc_eid_table.seid_enabled = 0; 1333 #endif 1334 } 1335 1336 void smc_clc_exit(void) 1337 { 1338 smc_clc_ueid_remove(NULL); 1339 } 1340